METHOD OF CONTROLLING THE SHAPE OF A SHEET OF STEEL AND CONTROL EQUIPMENT OF THE SHAPE OF A SHEET OF

专利摘要:
method of controlling the shape of a steel sheet and equipment for controlling the shape of a steel sheet. The present invention relates to a method of controlling the shape of the steel sheet includes (a) adjusting a desired shape correction of the steel sheet in a position of an electromagnet to a curved shape, (b) measuring the shape of the sheet when electromagnetic correction is performed, (c) calculate the shape of the steel plate at the position of a nozzle based on the shape of the steel plate, (d) repeat (b) and (c) by resetting the correction shape aimed for a curved shape having a smaller amount of twist, (e) when the amount of twist of the steel sheet at the nozzle position is less than the upper limit value, (f) calculate the vibration of the steel sheet at the nozzle position , and (g) adjust the electromagnet control gain until the vibration amplitude is less than the second upper limit value when the vibration amplitude is equal to or greater than the second upper limit value.
公开号:BR112014006754B1
申请号:R112014006754-6
申请日:2013-05-02
公开日:2021-07-20
发明作者:Yasushi Kurisu；Yoshihiro Yamada；Futoshi Nishimura；Katsuya Kojima；Junya Takahashi；Masaaki Omodaka；Masafumi Matsumoto；Hiroyuki Tanaka
申请人:Nippon Steel Corporation；
IPC主号:

专利说明:

TECHNICAL FIELD
[0001] The present invention relates to a method of controlling the shape of a steel sheet and a control equipment for the shape of a steel sheet to standardize the coating thickness of a steel sheet in a coating equipment. metal by continuous hot dip. Priority is claimed over Japanese Patent Application No. 2012108500, filed May 10, 2012, the contents of which are incorporated herein by reference. TECHNICAL BACKGROUND
[0002] When a hot-dip coated steel sheet is produced, initially the steel sheet is conveyed in a hot-dip coating bath, and the coating is applied to the front and back surfaces of the sheet. Subsequently, a gas such as air is sprayed by a drying nozzle towards the front and rear surfaces of the sheet while the coated steel sheet is removed from the hot dip coating bath and transported, the coating applied to the steel sheet. is dried, and so the coating thickness is adjusted and the hot-dip coated steel sheet is produced.
[0003] To produce the hot dip coated steel sheet having uniform coating thickness, it is necessary to make the gap between the drying nozzle and the front and rear surfaces of the steel sheet as constant as possible. Consequently, in general, a support roller is installed to press the steel sheet in the thickness direction and flatten the shape of the steel sheet close to the exit side of the hot-dip coating bath. However, the steel sheet cannot be sufficiently corrected by the support cylinder alone, and a warp (the so-called C warp, W warp, or similar) occurs in a transverse direction in the steel plate which is withdrawn out of the bath. hot dip coating.
[0004] In the relative technique, an electromagnetic correction technology is used, which uses a plurality of electromagnets to correct the warping of the steel sheet. For example, Patent Document 1 describes that to even out the coating thickness at both ends of a transverse direction of a steel sheet, electromagnetic correction is performed on information from a position in the thickness direction at both ends of the steel sheet which is measured by a separate sensor, and the portion of both ends of the steel sheet is corrected in an appropriate direction.
[0005] Furthermore, in Patent Document 2, a technology is described which adjusts the transverse direction arrangements of a plurality of electromagnets to correspond to a change in the width of the steel sheet or the meanders of a steel sheet when warping C of the steel sheet is corrected by electromagnets. Furthermore, in Patent Document 3, similarly, to correspond to the change of steel width or the intricacies of the steel sheet, a technology which moves the electromagnets in the transverse direction is described.
[0006] In addition, in Patent Document 4, a correction equipment for the shape of the steel sheet is described, which includes a control unit that automatically adjusts the pass line by moving the pair of support cylinders corresponding to the output value of the electromagnets on the front side and on the back side of the steel plate.
[0007] In addition, in Patent Document 5, equipment is described in which several sensors and electromagnets are installed to be in opposition to the plate, the position of the plate is detected by a sensor installed in the electromagnet and a sensor installed to be separate of the electromagnet, for example, installed in the position of the drying nozzle or similar, two signals from the sensors are fed back to the currents from the electromagnet, and the correction of the shape of the strip and the control of the vibration of the strip are performed in the position of the separate drying nozzle of the electromagnet, or similar.
[0008] In addition, in Patent Document 6, a method of continuous hot dip metallic coating is described in which when hot dip metallic coating is performed on a metallic strip by a hot dip metallic coating line which includes a drying nozzle adjusting the coating thickness, a non-contact control equipment which controls the position of the shape of a metal strip of the gas drying nozzle portion in a non-contact manner, and a correction cylinder in a bath By correcting the shape of the metal strip of the drying nozzle portion in a hot dip coating bath, the determination is performed whether the position of the metal strip shape of the gas drying nozzle portion can or cannot be controlled only by the non-contact control equipment based on at least the thickness of the metal strip to be coated with hot-dip metal. When the position of the shape of the metal strip of the gas drying nozzle portion can be controlled only by the non-contact control equipment, the position of the shape of the metal strip is controlled only by the non-contact equipment to make the correction cylinder in the bath not contact the metal strip. When control of the position of the shape of the metal strip is made difficult by only the non-contact control equipment, the position of the shape of the metal strip is controlled only by the correction cylinder in the bath or by using both the correction cylinder in the bath. and the non-contact control equipment. PRIOR TECHNIQUE DOCUMENTS PATENT DOCUMENTS
[0009] (Patent Document 1) - Japanese Unexamined Patent Application, First Publication n° 2007-296559
[00010] (Patent Document 2) - Japanese Unexamined Patent Application, First Publication No. 2004-306142
[00011] (Patent Document 3) - Japanese Unexamined Patent Application, First Publication No. 2003-293111
[00012] (Patent Document 4) - Japanese Unexamined Patent Application, First Publication No. 2003-113460
[00013] (Patent Document 5) - Japanese Unexamined Patent Application, First Publication No. H08-010847 (Patent Document 6) - Japanese Patent No. 5169089 DESCRIPTION OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION
[00014] As described above, as a method to uniform the thickness of the coating in relation to the steel sheet, several methods are suggested. Generally, the methods refer to improving a unit of electromagnet equipment.
[00015] When the shape in the transverse direction of the steel sheet is optimized considering the shape of the warp in the transverse direction of the steel sheet by the cylinder in the bath, if warping occurs in the steel sheet in the position of the drying nozzle even when the warping of the steel sheet is corrected in the position of the electromagnet, the coating thickness in the transverse direction of the steel sheet becomes uneven. Furthermore, since vibration occurs in the steel sheet that is lifted from the coating bath when the steel sheet is passed at high speed, the coating thickness in a longitudinal direction of the steel sheet becomes uneven.
[00016] Also, there is usually an upper limit on the frequency of vibration that can be suppressed by the electromagnet, and thus it is not possible to suppress vibrations that have a high frequency that is greater than or equal to the frequency response of the electromagnet. In addition, when the vibration of the steel sheet is suppressed by an electromagnetic force from the electromagnet, if the steel sheet is strongly held by the electromagnetic force, a self-excited vibration having a position of adding the electromagnetic force as a bulge occurs in the steel sheet .
[00017] The present invention provides a new and improved steel sheet shape control method and steel sheet shape control equipment that adequately suppress warping and vibration of a steel sheet by optimizing the shape in a transverse direction of the steel sheet, and thus can even out the coating thickness in the transverse direction and longitudinal direction of the steel sheet. MEANS TO SOLVE PROBLEMS
[00018] According to the first aspect of the present invention, there is provided a method of controlling the shape of the steel sheet that, in a continuous hot-dip metal coating equipment that includes a drying nozzle arranged to be opposite a steel sheet raised from a coating bath and several pairs of electromagnets arranged along the transverse direction on both sides in the direction of the steel sheet thickness above the drying nozzle, controls the shape in the transverse direction of the steel sheet by the application of an electromagnetic force in the thickness direction with respect to the steel sheet by the electromagnets, the method including:
[00019] establish the desired correction shape in the transverse direction of the steel sheet in a position of the electromagnet to a curved shape by performing a first numerical analysis based on the pass condition of the steel sheet;
[00020] measure the shape in the transverse direction of the steel sheet at a predetermined position between the drying nozzle and the electromagnet or measure the amount of hot-dip metal coating relative to the steel sheet in a subsequent step of the position of the electromagnet when the steel sheet is transported in a state in which electromagnetic force is applied to the steel sheet by the electromagnet so that the shape in the transverse direction of the steel sheet at the position of the electromagnet is the curved shape established in item (A) ;
[00021] calculate the shape in the transverse direction of the steel sheet at the position of the drying nozzle based on the shape of the coating amount measured in (B).
[00022] repeat items (B) and (C) by adjusting the desired correction shape to a curved shape having a portion amount different from the curved shape established in item (A) by performing the first numerical analysis when the amount of warpage as calculated in item (C) is equal to or greater than the first upper limit value;
[00023] measure the vibration in the direction of the steel sheet thickness at the predetermined position when the amount of warping of the form calculated in item (C) is less than the first upper limit value;
[00024] calculate the vibration in the direction of the thickness of the steel sheet at the position of the drying nozzle by performing a second numerical analysis based on the vibration measured in item (E); and
[00025] (G) adjust an electromagnet control gain by performing the second numerical analysis to make the vibration amplitude calculated in item (F) be less than a second upper limit when the amplitude is equal to or greater than the second value upper limit.
[00026] According to a second aspect of the present invention, the first aspect the continuous hot-dip metal coating equipment may also include one or more first sensors that are arranged to be opposed to the steel sheet above the drying nozzle and below the electromagnet, and measure the position in the direction of the thickness of the steel plate,
[00027] in item (B), the shape in the transverse direction of the steel sheet at the position of the first sensor can be measured by the first sensor in the state in which the electromagnetic force is applied to the steel sheet by the electromagnet, and
[00028] in item (E), vibration in the direction of steel sheet thickness at the position of the first sensor can be measured by the first sensor when the amount of warping as calculated in item (C) is less than the first threshold value higher.
[00029] According to a third aspect of the present invention, in the first aspect or in the second aspect the continuous hot-dip metal coating equipment may also include a plurality of pairs of second sensors that are arranged along the transverse direction in both the sides in the direction of the thickness of the steel plate in the position of the electromagnet, and measure the position in the direction of the thickness of the steel plate, and
[00030] may include:
[00031] (A1) measure the position in the thickness direction of the steel sheet at the position of the electromagnet by the second sensor when the steel sheet is transported in a state where electromagnetic force is not applied by the electromagnet;
[00032] (A2) calculate the warp shape in the transverse direction of the steel sheet at the position of the electromagnet in the state where the electromagnetic force is not applied by the electromagnet, based on the position measured in item (A1); and
[00033] (A3) establish the desired correction shape to a curved shape corresponding to the warp shape calculated in item (A2).
[00034] According to a fourth aspect, in the third aspect, in item (A3), the desired correction shape can be adjusted to a curved shape that is in the direction of thickness to the warped shape calculated in item (A2).
[00035] According to a fifth aspect of the present invention, in the first aspect or in the second aspect,
[00036] in item (A),
[00037] the desired correction shape in the transverse direction of the steel plate by the electromagnet for each pass condition can be established using a predetermined database such that the amount of shape warping in the transverse direction of the steel plate in the position of the electromagnet is within a predetermined range and the amount of shape warping in the transverse direction of the steel sheet at the position of the drying nozzle is less than the first upper limit value in the state in which the electromagnetic force is applied.
[00038] According to a sixth aspect of the present invention, in any one of the first to fifth aspects,
[00039] in item (D),
[00040] the arrangement of a cylinder provided in the coating bath can be adjusted so that the amount of shape warping in the transverse direction of the steel sheet at the position of the electromagnet is within a predetermined range and the amount of shape warping in the Transverse direction of the steel sheet at the drying nozzle position is less than the first upper limit value in the state in which electromagnetic force is applied.
[00041] According to a seventh aspect of the present invention, in the sixth aspect the cylinder may include a dip roller that converts the transport direction of the steel sheet to an upper vertical side, and at least one support cylinder that is provided above of the dip roller and contacts the steel plate transported to the vertical upper side, and
[00042] in item (D),
[00043] the amount of thrust of the steel sheet by the support cylinder can be adjusted so that the amount of warping of the shape in the transverse direction of the steel sheet at the position of the electromagnet is within a predetermined range and the amount of warping of the shape in the transverse direction of the steel sheet at the drying nozzle position is less than the first upper limit value in the state in which the electromagnetic force is applied.
[00044] According to an eighth aspect of the present invention, in any one of the first to seventh aspects,
[00045] in item (D),
[00046] items (B) and (C) can be repeated by adjusting the desired correction shape to a curved shape having a lesser amount of warpage than that of the curved shape established in item (A) when the amount of warpage of the shape calculated in item (C) is equal to or greater than the first upper limit value or when the amount of twist of the warp shape in the transverse direction of the steel sheet at the electromagnet position is outside a predetermined range.
[00047] According to a ninth aspect of the present invention, in any one of the first to eighth aspects, the first numerical analysis can be performed using a virtual cylinder.
[00048] According to a tenth aspect of the present invention, in any one of the first to ninth aspects,
[00049] The span of the steel sheet can be calculated using a constant spring in the second numerical analysis.
[00050] According to an eleventh aspect of the present invention, in any one of the first to tenth aspects,
[00051] the electromagnet control system can be a PID control,
[00052] in item (G),
[00053] The amplitude can be controlled by decreasing the proportional gain of a proportional operation of the PID control as gain control.
[00054] According to a twelfth aspect of the present invention, in any one of the fifth to eleventh aspects, the range of the amount of shape warping in the transverse direction of the steel sheet may be 2.0 mm or more.
[00055] According to a thirteenth aspect of the present invention, in any one of the first to twelfth aspects, the value of the first upper limit may be 1.0 mm, and the value of the second upper limit may be 2.0 mm .
[00056] According to a fourteenth aspect of the present invention, there is provided a steel sheet shape control equipment which is provided in a continuous hot dip metal coating equipment including a drying nozzle arranged to be in opposition to the steel sheet lifted from the coating bath, and which controls the shape in a transverse direction of the steel sheet by applying an electromagnetic force in the thickness direction with respect to the steel sheet, equipment including:
[00057] a plurality of pairs of electromagnets that are arranged along the transverse direction on both sides in the direction of the thickness of the steel sheet above the drying nozzle; and
[00058] a control device that controls the electromagnet,
[00059] where the control device,
[00060] adjusts the desired correction shape in the transverse direction of the steel sheet at a position of the electromagnet to a curved shape by performing a first numerical analysis based on the pass condition of the steel sheet,
[00061] measures the shape in the transverse direction of the steel sheet in a predetermined position between the drying nozzle and the electromagnet or measures the amount of coating of the hot-dip metal in relation to the steel sheet in the subsequent step of the electromagnet position when the steel sheet is transported in a state in which electromagnetic force is applied to the steel sheet by the electromagnet so that the shape in the transverse direction of the steel sheet at the position of the electromagnet is the curved shape established in item (A),
[00062] calculates the shape in the transverse direction of the steel sheet at the position of the drying nozzle based on the shape of the coating amount measured in item (B),
[00063] repeats item (B) and item (C) by establishing the desired correction form for a curved shape having a different amount of warpage than the curved shape established in item (A) by performing the first numerical analysis when the quantity of warpage as calculated in item (C) is equal to or greater than a first upper limit value,
[00064] measures vibration in the direction of the thickness of the steel sheet at the predetermined position when the amount of warping of the form calculated in tem (C) is less than the first upper limit value,
[00065] calculates the vibration in the direction of the steel plate thickness at the drying nozzle position by performing a second numerical analysis based on the vibration measured in item (E), and
[00066] adjusts the electromagnet control gain by performing the second numerical analysis to make the vibration amplitude calculated in item (F) less than the second upper limit value when the amplitude is equal to or greater than the second upper limit value .
[00067] According to a fifteenth aspect of the present invention, in the fourteenth aspect the steel sheet shape control equipment may also include one or more first sensors that are arranged to be opposed to the steel sheet above the nozzle. drying and below the electromagnet, and measuring the position in the direction of the thickness of the steel plate,
[00068] the control equipment
[00069] in item (B) can measure the shape in the transverse direction of the steel sheet at the position of the first sensor by the first sensor in the state in which the electromagnetic force is applied to the steel sheet by the electromagnet, and
[00070] in item (E) can measure vibration in the direction of steel sheet thickness at the position of the first sensor by the first sensor when the amount of warping as calculated in item (C) is less than the first upper limit value.
[00071] According to a sixteenth aspect of the present invention, in the fourteenth or fifteenth aspects the steel sheet shape control equipment may also include a plurality of pairs of second sensors that are arranged along the transverse direction in both sides in the direction of the thickness of the steel plate in the position of the electromagnet, and measure the position in the direction of the thickness of the steel plate,
[00072] the control equipment,
[00073] when the form of the desired correction is established in item (A),
[00074] (A1) can measure the position in the direction of the thickness of the steel sheet at the position of the electromagnet by the second sensor when the steel sheet is transported in a state where the electromagnetic force is not applied by the electromagnet,
[00075] (A2) can calculate the shape of the warp in the transverse direction of the steel sheet at the position of the electromagnet in the state where the electromagnetic force is not applied by the electromagnet, based on the position measured in item (A1), and (A3 ) can establish the desired correction shape for a curved shape corresponding to the warp shape calculated in item (A2).
[00076] According to a seventeenth aspect of the present invention, in the sixteenth aspect, in item (A3) the desired correction shape can be established for a curved shape that is symmetrical in the thickness direction to the warp shape calculated in the item (A2).
[00077] According to an eighteenth aspect of the present invention, in the fourteenth and fifteenth aspects,
[00078] the control equipment,
[00079] when the desired form of correction is established in item (A)
[00080] can establish the desired correction shape in the transverse direction of the steel sheet by the electromagnet for each passing condition using a predetermined database such that the amount of warping of the shape in the transverse direction of the steel sheet at the position of the electromagnet is within a predetermined range and the amount of shape warping in the transverse direction of the steel sheet at the drying nozzle position is less than the value of the first upper limit in the state in which the electromagnetic force is applied.
[00081] According to a nineteenth aspect of the present invention, in any of the fourteenth and fifteenth aspects,
[00082] the control equipment in item (D),
[00083] can adjust the arrangement of a cylinder provided in the coating bath so that the amount of shape warping in the transverse direction of the steel sheet at the position of the electromagnet is within a predetermined range and the amount of shape warping in the direction steel plate transverse at the drying nozzle position is less than the first upper limit value in the state in which electromagnetic force is applied.
[00084] According to a twentieth aspect of the present invention, in the nineteenth aspect the cylinder may include a dip roller that converts the transport direction of the steel sheet to a vertical upper side, and at least one support cylinder that is provided above the dip roller and contacts the steel plate transported to the vertical upper side, and
[00085] the control equipment, in item (D),
[00086] can establish the amount of thrust of the steel sheet by the support cylinder so that the amount of shape warping in the transverse direction of the steel sheet at the position of the electromagnet is within a predetermined range and the amount of shape warping in the transverse direction of the steel sheet at the drying nozzle position is less than the first upper limit value in the state in which the electromagnetic force is applied.
[00087] According to a twenty-first aspect of the present invention, in any one of the fourteenth to twentieth aspects,
[00088] the control equipment, in item (D),
[00089] can repeat items (B) and (C) by redefining the desired correction shape to a curved shape having the amount of warpage less than the curved shape of the shape calculated in item (A) when the amount of warpage of the shape calculated in item (C) is equal to or greater than the value of the first upper limit or when the amount of warping of the shape twisted in the transverse direction of the steel sheet at the electromagnet position is outside a predetermined range.
[00090] According to a twenty-second aspect of the present invention, in any one of the fourteenth to twenty-first aspects, the first numerical analysis can be performed using a virtual cylinder.
[00091] According to a twenty-third aspect of the present invention, in any one of the fourteenth to twenty-second aspects, the amplitude of the steel sheet can be calculated using a constant spring in the second numerical analysis.
[00092] According to a twenty-fourth aspect of the present invention, in any one of the fourteenth to twenty-third aspects,
[00093] the electromagnet control system can be a PID control, and
[00094] in item (G),
[00095] The amplitude can be controlled by decreasing the proportional gain of a proportional PID control operation as the control gain.
[00096] According to a twenty-fifth aspect of the present invention, in any one of the eighteenth to twenty-fourth aspects, the range of the amount of warping in the transverse direction of the steel sheet at the position of the electromagnet may be 2.0 mm or more .
[00097] According to a twenty-sixth aspect of the present invention, in any one of the fourteenth to twenty-fifth aspects, the first upper limit value may be 1.0 mm, and the second upper limit value may be 2.0 mm.
[00098] According to the settings described above, correcting the shape in the transverse direction of the steel sheet in the electromagnet position not for a flat shape but positively correcting the shape for the curved shape, the rigidity of the steel sheet which passes between the drying nozzle and the electromagnet is increased, and the amount of shape warping in the transverse direction of the steel sheet at the drying nozzle position is controlled to be the first upper limit value or less. Consequently, the shape in the transverse direction of the steel sheet at the position of the drying nozzle can be controlled to be flat. Therefore, since the hot dip coating can be dried evenly in the transverse direction of the steel sheet by the drying nozzle, the thickness of the coating in the transverse direction of the steel sheet can be uniformed.
[00099] In addition, since the rigidity of the steel sheet in the position of the electromagnet can be increased by the electromagnetic correction described above, the vibration in the direction of the thickness of the steel sheet in the position of the drying nozzle can also be suppressed. Consequently, since the hot dip coating can be dried evenly in the longitudinal direction of the steel sheet by the drying nozzle, the thickness of the coating in the longitudinal direction of the steel sheet can be made uniform. EFFECTS OF THE INVENTION
[000100] As described above, according to each aspect of the present invention, by optimizing the shape in the transverse direction of the steel sheet, the warping and vibration of the steel sheet can be adequately suppressed, and the coating thickness in the direction cross section of the steel sheet can be standardized. BRIEF DESCRIPTION OF THE DRAWINGS
[000101] FIG. 1 is a schematic diagram showing a continuous hot-dip metal coating apparatus in accordance with a first preferred embodiment of the present invention.
[000102] FIG. 2 is a schematic diagram showing a continuous hot-dip metal coating apparatus in accordance with the second preferred embodiment of the present invention.
[000103] FIG. 3 is a horizontal cross-sectional diagram showing the arrangement of a group of electromagnets of the steel sheet shape control equipment in accordance with the first and second preferred embodiments of the present invention.
[000104] FIG. 4 is a horizontal cross-sectional diagram showing the desired correction shape of the steel sheet in the position of an electromagnet according to the first and second preferred configurations.
[000105] FIG. 5 is a flowchart showing a method of controlling the shape of the steel sheet in accordance with the first and second preferred embodiments.
[000106] FIG. 6 is a flowchart showing a specific example of a method of establishing the desired form of correction in accordance with the first and second preferred embodiments.
[000107] FIG. 7 is a diagram showing a model in a first numerical analysis according to the first and second preferred configurations. FIG. 8 is a diagram showing a model in a second numerical analysis in accordance with the first and second preferred configurations. PREFERRED SETTINGS FOR PERFORMING THE INVENTION
[000108] Hereinafter, preferred embodiments of the present invention will be described in detail in relation to the accompanying drawings. In addition, in the present specification and in the drawings, the same reference numerals are attached to components that have substantially the same functions, and overlapping descriptions are omitted. (1. CONFIGURATION OF METAL CONTINUOUS COATING EQUIPMENT BY HOT IMMERSION)
[000109] Initially, with respect to FIG. 1, the total configuration of a continuous hot-dip metal coating apparatus will be described, to which a sheet steel shape control apparatus according to the first preferred embodiment of the present invention is applied. FIG. 1 is a schematic diagram showing a continuous hot dip metal coating apparatus 1 in accordance with the first preferred embodiment of the present invention.
[000110] As shown in FIG. 1, continuous hot dip metal coating equipment 1 is equipment for continuously hot dip coating metal to a surface of a belt-shaped steel plate 2 by immersing steel plate 2 in a bath of coating 3 filled with hot dip metal. The continuous hot dip metal coating equipment 1 includes a bath 4, a dip roller 5, a drying nozzle 8, and a steel sheet shape control equipment 10. The steel plate shape control equipment steel 10 includes a sensor 11. an array of electromagnets 12 including a position sensor, a coating amount measuring equipment 13, a control equipment 14, and a database 15. In continuous dip coating metal equipment hot 1, after the steel plate 2 advances in the direction of the arrow and is transported in the coating bath 4, the steel plate 2 is removed from the coating bath 3.
[000111] The steel sheet 2 is a metallic material in the form of a belt and is an object to be coated by the hot dip metal. Furthermore, in general, the hot-dip metal forming the coating bath 3 includes an anti-corrosion metal such as zinc, lead-tin, and aluminum. However, hot dip metal can include other metals used as the coating metal. As a hot-dip coated steel sheet obtained by coating steel sheet 2 with the hot-dip metal, a hot-dip zinc-coated steel sheet, a galvannealed steel sheet, or the like is representative. However, hot dip coated steel sheet can include other types of coated steel sheet. Hereinafter, an example will be explained in which hot-dip zinc is used as the hot-dip metal by configuring the coating bath 3, the hot-dip zinc is coated on the surface of the steel sheet 2, and a steel sheet is produced. zinc coated by hot dip.
[000112] Bath 4 stores coating bath 3 which is configured as hot dip zinc (hot dip metal). The dip roller 5, in which the axial direction is horizontal and a shaft is rotatably provided, is provided in coating bath 3.
[000113] The dip roller 5 is an example of a cylinder (hereinafter referred to as the cylinder in the bath) which is arranged in the coating bath 3 to guide the steel sheet 2, and is arranged in the lowermost position of the coating bath 3 The dip roller 5 is rotated in a counterclockwise direction shown in FIG. 1 as per the transport of the steel sheet 2. The dip roller 5 converts the direction of the steel sheet 2, which is introduced in the direction of an inclined underside in the coating bath 3, to the upper side in a vertical direction (direction of transport X).
[000114] Furthermore, on the outside of the coating bath 3 immediately above the dip roller 5, the pair of drying nozzles 8 and 8 is arranged so that the drying nozzles 8 and 8 are opposite each other above the surface of the coating bath 3 at a predetermined height. Drying nozzles 8 and 8 are configured as gas drying nozzles which spray gas (eg air) on the surfaces of steel sheet 2 from both sides in the direction of thickness Z. Drying nozzles 8 and 8 dry excess hot-dip zinc (hot-dip metal) by spraying gas on both surfaces of the steel sheet 2 which is raised in the transport direction X (vertical direction) from the coating bath 3. Consequently , the coating thickness (amount of coating) of the hot-dip zinc (hot-dip metal) in relation to the surfaces of the steel sheet 2 is established.
[000115] In addition, the steel sheet shape control equipment 10 for controlling the shape in a Y transverse direction of the steel sheet 2 is provided above the drying nozzles 8 and 8. The sheet shape control equipment of steel to correct a warp (so-called C warp, W warp, or the like) with respect to an axis in the transverse Y direction of the steel sheet 2. The shape control equipment of the steel sheet 10 includes sensors 11 and 11 , electromagnet groups 12 and 12, coating amount measuring equipment 13 and 13, control equipment 14, and the like which are shown in FIG. 1, and its details will be described below.
[000116] In addition to components other than those shown, continuous hot dip metal coating equipment 1 may include an upper cylinder that supports steel sheet 2 while converting the transport direction of steel sheet 2 into the plus side. high outside the coating bath 3, an intermediate cylinder that supports the steel plate 2 midway until it reaches the upper cylinder, or similar. In addition, a bonding furnace which performs a bonding treatment can be arranged after the upper cylinder.
[000117] Next, with respect to FIG. 2, an overall configuration of a continuous hot-dip metal coating apparatus 1 according to a second preferred embodiment of the present invention will be described. FIG. 2 is a schematic diagram showing the continuous hot dip metal coating apparatus 1 according to the second preferred embodiment.
[000118] As shown in FIG. 2, the continuous hot-dip metal coating apparatus 1 according to the second preferred configuration is different from that of the first preferred configuration described above (referring to FIG. 1) in which the pair of bearing rollers 6 and 7 is provided in coating bath 3, and other configurations are similar to each other.
[000119] Similar to the dip roller 5, the support cylinders 6 and 7 are examples of cylinders in the bath that guide the steel sheet 2, and are provided as a pair of in the vicinity of the exit side in the dip coating bath to hot plate 3 on the upper slanted side of the dip roller5. Also on support cylinders 6 and 7, the axial directions are horizontal, and the shafts are rotatably provided by bearings (not shown).
[000120] Support cylinders 6 and 7 are arranged to insert the steel plate 2, which is raised in the vertical direction from the dip roller 5, from both sides in the direction of thickness Z, and correct the shape of the steel plate 2 by pressing steel plate 2 in the direction of thickness Z. That is, support rollers 6 and 7 contact steel plate 2, which is transported along a pass line 6a in the X transport direction (vertical upper side) from the dip roller 5, from both sides in the direction of thickness Z. At this time, a support cylinder 6 is pushed in the direction of thickness Z, and thus the steel plate 2 is transported flowing between the transport cylinders 6 and 7, and so the shape is corrected. At that time, the thrust amount of support roller 6 is referred to as an Inter Mesh(IM). That is, IM is a parameter that indicates the amount of thrust in the thickness Z direction of support cylinder 6 relative to steel plate 2 that is transported on pass line 6a along transport direction X.
[000121] Next, in a coating line of continuous hot-dip metal coating equipment 1 having the configuration described above, a procedure that makes the steel sheet 2 be transported will be described. Furthermore, in the present preferred embodiment, the X transport direction, the Y transverse direction and the Z thickness direction shown in FIGs. 1 and 2 are orthogonal to each other.
[000122] As shown in FIGs. 1 and 2, in continuous hot-dip metal coating equipment 1, the steel sheet 2 is transported in the longitudinal direction (arrow direction) by a motive source (not shown), and enters a predetermined inclination angle at from the top side to the bottom side in coating bath 3 through a spout (not shown). In addition, the hot-dip zinc (hot-dip metal) is coated onto the front and rear surfaces of the steel sheet 2 by the steel sheet 2 which has entered conveyed into the coating bath 3. The steel sheet 2 which is transported in the coating bath 3 passes around the dip roller 5, the transport direction of the steel sheet is converted to the upper side in the vertical direction, and the steel sheet is withdrawn above the coating bath 3. At this time, in the continuous hot-dip metal coating apparatus 1 having the configuration of FIG. 2, the shape of the steel sheet 2 is corrected when the steel sheet 2 transported to the upper side in the vertical direction in the coating bath 3 passes between the pair of support cylinders 6 and 7.
[000123] Subsequently, the steel sheet 2 raised from the coating bath 3 is transported along the transport direction X (the upper side in the vertical direction) and passes between drying nozzles 8 and 8 arranged to be opposite each other. At this time, air is sprayed by drying nozzles 8 and 8 from both sides in the Z thickness direction of conveyed steel sheet 2, the coating of hot dip zinc (hot dip metal) applied to both surfaces of steel sheet 2 is blown, and thus the coating thickness is established.
[000124] The steel plate 2, which passes between drying nozzles 8 and 8, is also transported along the transport direction X, and sequentially advances between sensors 11 and 11, electromagnet groups 12 and 12, and the coating amount measuring equipment 13 and 13 which are arranged on both sides in the Z thickness direction of the steel sheet 2, and the shape in the Y transverse direction is corrected.
[000125] Thus, in the continuous hot-dip metal coating equipment 1, the steel sheet 2 is continuously immersed in the coating bath 3 and is coated by hot-dip zinc (hot-dip metal), and thus hot-dip zinc-coated steel sheet (hot-dip metal-coated steel sheet) having the predetermined coating thickness is produced. (2. CONFIGURATION OF STEEL SHAPE CONTROL EQUIPMENT)
[000126] The following will be described in detail, in relation to FIGs. 1 to 3, a configuration of the form control equipment of the steel sheet 10 according to the present preferred configuration. FIG. 3 is a horizontal cross-sectional diagram showing the arrangement of electromagnet groups 12 and 12 of steel sheet shape control equipment 10 in accordance with the present embodiment.
[000127] As shown in FIGs. 1 and 2, the shape control equipment of the steel sheet 10 includes the plurality of pairs of sensors 11 and 11 which are arranged on both sides in the direction of thickness Z of the steel sheet 2 which is withdrawn from the drying nozzles 8 and 8 and conveyed in the transport direction X, the plurality of pairs of electromagnet groups 12 and 12, the plurality of pairs of coating amount measuring equipment 13 and 13, and the control equipment 14 controlling the sensors, the groups of electromagnets, and the measuring equipment.
[000128] Initially sensor 11 will be described. Sensors 11 and 11 (corresponding to the "first sensor" of the present invention) are arranged to be opposite both sides in the direction of thickness Z of the steel plate 2 d above the nozzles of drying 8 and 8. Each sensor 11 has a function that measures the position in the transverse direction Y of the steel sheet 2 that is transported in the transport direction X. In the present preferred embodiment, the sensor 11 is configured as a distance sensor that measures the distance to the 2 opposite steel plate. For example, as a distance sensor, an eddy current displacement meter can be used that measures the position in the Z-thickness direction of steel sheet 2 based on the impedance change of a sense coil due to the eddy current generated in the steel sheet 2.
[000129] Furthermore, each sensor 11 is arranged to be separated by a predetermined distance from the steel plate 2 so as not to contact the steel plate 2 even when the steel plate 2 transported in the transport direction X vibrates in the direction of thickness Z. The various sensors 11 are arranged at a predetermined interval along the transverse direction Y of the steel sheet 2. Each of the various sensors 11 measures the position of each portion in the transverse direction Y of the opposite steel sheet 2. Consequently, the shape (warp shape with respect to the axis in the transverse Y direction) in the Y transverse direction of the steel sheet 2 can be measured using sensors 11 and 11.
[000130] Sensors 11 and 11 are arranged at predetermined height positions above drying nozzles 8 and 8 and below the group of electromagnets 12 and 12. In the present preferred configuration, sensors 11 and 11 are arranged in a column at positions of heights in the vicinity of the drying nozzles 8 and 8, and can measure the shape in the transverse Y direction of the steel sheet 2 in the vicinity of the drying nozzles 8 and 8. However, the present invention is limited to the example, and the sensors 11 and 11 can be arranged in a column or in a plurality of columns at any height positions as long as the sensors are positioned between the drying nozzles 8 and 8 and the electromagnet groups 12 and 12. For example, the sensors can be arranged in the neighborhood of electromagnet groups 12 and 12, in intermediate positions between drying nozzles 8 and 8 and electromagnet groups 12 and 12, or similar, and can be arranged in two columns in the vicinity of electromagnet groups 12 and 12 and in the neighborhood of the drying nozzles 8 and 8. Hereinafter the height position in the transport direction X, in which each of the sensors 11 and 11 is disposed, is referred to as "sensor position".
[000131] In the present preferred configuration, since the various pairs of sensors 11 and 11 are arranged along the transverse direction Y on both sides in the direction of the thickness Z of the steel plate 2, the shape in the transverse direction Y of the plate 2 steel can be measured correctly. However, even when the sensors 11 are arranged on only one side in the thickness Z direction of the steel sheet 2, the shape in the transverse direction Y of the steel sheet 2 can be measured.
[000132] The following will describe the group of electromagnets 12. The groups of electromagnets 12 and 12 are arranged to be opposed to each other on both sides in the direction of thickness Z of the steel sheet 2 above the sensors 11 and 11. The groups of electromagnets 12 and 12 can be arranged in any height positions provided that the groups of electromagnets are positioned above the drying nozzles 8 and 8. Henceforth, the position of heights in the transport direction X, in which each of the groups of electromagnets 12 and 12 is arranged, is referred to as "electromagnet position".
[000133] As shown in FIG. 3, the groups of electromagnets 12 and 12 are configured from a plurality of pairs of electromagnets 101 to 107 and 111 to 117 which are arranged along the transverse direction Y on both sides in the thickness Z direction of the steel sheet 2. electromagnets 101 to 107 which configure one group of electromagnets 12 and the electromagnets 111 to 117 which configure the other group of electromagnets 12 are respectively arranged to be opposite each other in the direction of thickness Z. In the example shown, 7 electromagnets 101 to 107 and 7electromagnets 111 to 117 are respectively arranged at a predetermined interval along the transverse direction Y on both sides of the steel sheet 2, and 7 pairs of electromagnets are arranged so that the electromagnets in each pair are opposite each other. For example, the electromagnet 101 and the electromagnet 111 are arranged to be opposed to each other to oppose the steel sheet 2 in the direction of thickness Z. Similarly, other electromagnets 102 to 107 and other electromagnets 112 to 117 are respectively arranged to each other one to a.
[000134] In addition, the position sensors 121 to 127 and 131 to 137 (corresponding to a "second sensor" of the present invention) are installed respectively in the electromagnets 101 to 107 and 111 to 117. The sensors 121 to 127 and 131 to 137 are arranged along the transverse Y direction on both sides of the Z thickness direction of the steel sheet 2 at the electromagnet positions, and measure the positions in the Z thickness direction of the steel sheet 2 at the electromagnet positions. Furthermore, in the example of FIG. 3, electromagnets 101 to 107 and 111 to 117 and position sensors 121 to 127 and 131 to 137 are arranged one by one. However, the arrangement and number of installations of position sensors 121 to 127 and 131 to 137 can be changed accordingly.
[000135] In the present preferred configuration, the electromagnets 101 to 107 that configure one group of electromagnets 12 and the electromagnets 111 to 117 that configure the other group of electromagnets 12 are separated from each other by a distance 2L in the direction of thickness Z. This is , each of the electromagnets 101 to 107 and 111 to 117 is arranged to be separated by a predetermined distance L from the steel plate 2 so as not to contact the steel plate 2 even when the steel plate 2 is transported in the direction of transport X vibrates in the direction of thickness Z. Also, as shown in FIG. 3, a straight line, which indicates an intermediate position that is positioned an equal distance L in the direction of thickness Z from both electromagnet groups 12 and 12, is referred to as centerline 22. Centerline 22 corresponds to the axis in the transverse Y direction of the steel sheet 2.
[000136] If the steel sheet 2 is completely flat without being bent in the cross direction Y at the portions of the electromagnets, the cross section of the steel sheet 2 is positioned on the center line 22. However, in a real operation, due to the influence of the cylinder in the bath, the steel plate 2 transported in the X transport direction is bent in the Z thickness direction, and the warp (C warp, W warp and the like) in the transverse Y direction can be generated. The example in FIG. 3 shows the state in which the steel sheet undergoes C-warping by an amount of dM warping. In addition, the amount of dM warping means a length in the direction of thickness Z from the most protruding portion of the steel sheet to the most recessed portion of the steel sheet 2. The greater the amount of dM warping, the more intense the warping of the steel sheet 2.
[000137] In the present preferred embodiment, the shape control equipment of the steel sheet 10 is provided to deal with warping, and the shape in the transverse Y direction of the steel sheet 2 can be corrected by applying an electromagnetic force to the sheet of steel 2. That is, each of the electromagnets 01 to 107 and 111 to 117 applies electromagnetic force in the direction of thickness Z to each opposite portion of the steel plate 2, and thus each portion of the steel plate 2 is magnetically attracted in the direction of thickness Z. Consequently, each portion in the transverse Y direction of the steel sheet 2 is magnetically attracted with a different intensity in all groups of electromagnets 12 and 12, and thus the shape in the transverse Y direction of the steel sheet 2 can be corrected up to an arbitrary targeted form of correction 20.
[000138] The coating amount measuring equipment 13 will be described below. The coating amount measuring equipment 13 and 13, which are arranged to be opposite each other on both sides in the Z thickness direction of the steel sheet transported 2, are provided in the last stage of the line of continuous hot-dip metal coating equipment 1. in the present preferred embodiment, for example, as coating quantity measuring equipment 13 and 13, a fluorescent equipment of X-ray. In x-ray fluorescent equipment, the x-ray is irradiated on each of the front and rear surfaces of the steel sheet 2, the amount of x-ray fluorescence emitted from the applied coating is measured, and thus the amount of coating applied to each of the front and rear surfaces of sheet steel 2 can be measured.
[000139] In addition, each coating quantity measuring equipment 13 is arranged to be separated by a predetermined distance from the steel plate 2 so as not to contact the steel plate 2 even when the steel plate 2 is transported in the transport direction X vibrates in the direction of thickness Z. The plurality of coating quantity measuring equipment 13 can be arranged at a predetermined interval along the transverse direction Y of the steel sheet 2, and only one coating quantity measuring equipment casing 13 can be arranged to map the transverse direction. Consequently, the amount of coating in the transverse Y direction of the steel sheet 2 can be measured. Therefore, the shape (the shape of the warp with respect to the axis in the transverse Y direction) in the transverse Y direction of steel sheet 2 can be estimated using the measured amount of coating.
[000140] Next, the control device 14 will be described. The control device 14 is configured of a calculation processor such as a microprocessor. The database 15 is configured from storage equipment such as a semiconductor memory or a hard disk and is accessible by the control device 14. In addition, the sensors 11 and 11 described above, the groups of electromagnets 12 and 12, and the coating quantity measuring equipment 13 and 13 are connected to the control equipment 14. The control device 14 controls each of the electromagnets 101 to 107 and 111 to 117 of the electromagnet groups 12 and 12 based on the measured results of the sensors 11 and 11 or in the coating quantity measuring equipment 13 and 13. At this time, as a control system, a feedback control, eg a PID control, can be used. At this time, as a control system, a feedback control can be used, for example, a PID control. The control equipment 14 sets a control parameter for PID control and controls the operation of each of the electromagnets 101 to 107 and 111 to 117 using the control parameter. The control parameter is a parameter to control the electromagnetic force applied to steel sheet 2 by controlling the current flow to each electromagnet 101 to 107 and 111 to 117. For example, the control parameter includes a control gain (ie , a proportional gain Kp, an integration gain Ki, and a differential gain Kd), or similar of each between a proportional operation (operation P), an integration operation (operation I, and a differential operation (operation D) of the PID control The control equipment 14 adjusts each control gain between 0% and 100% and controls the electromagnetic force generated by each of the electromagnets 101 to 107 and 111 to 117.
[000141] The information of the measured results of the positions in the Z thickness direction of each portion in the Y transverse direction of the steel sheet 2 at the sensor positions is input into the control equipment 14 from sensors 11 and 11. In addition, the information of the coating quantity measurement results in relation to the front and rear surfaces of the steel sheet 2 is input to the control equipment 14 from the coating quantity measuring equipment 13 and 13. The control equipment 14 controls each of the electromagnets 101 to 107 and 111 to 117 of the electromagnet groups 12 and 12 based on the position information in the Z thickness direction or the amount of coating, on the information of various passage conditions, on the information kept in the database 15, or similar. At that time, the control equipment 14 controls each of the electromagnets 101 to 107 and 111 to 117 regardless of how the shape in the transverse Y direction of the steel sheet 2 at the electromagnet positions is a suitable targeted correction form 20, and applies the electromagnetic force in the Z-thickness direction with respect to each portion of the steel sheet 2 of each of the electromagnets 101 to 107 and 111 to 117.
[000142] Specifically, for example, the control equipment 14 calculates the positions in the Z thickness direction of each portion in the Y transverse direction of the steel sheet 2 at the positions of the electromagnets based on the measured results (ie the positions in the direction of the thickness Z of each portion in the transverse Y direction of the steel sheet 2 at the sensor positions) by sensors 11 and 11. In addition, the control equipment 14 controls the electromagnet groups 12 and 12 based on the calculated positions in the direction of thickness Z of each portion, applies electromagnetic force to each portion in the transverse direction Y of the steel sheet 2, and corrects the shape in the transverse Y direction of the steel sheet 2 to the target correction shape 20.
[000143] In addition, the control equipment 14 calculates the positions in the Z thickness direction of each portion in the Y transverse direction based on the measured results (ie, the coating amount of each portion in the Y transverse direction of the steel sheet 2 in the position of the drying nozzle) of the coating amount of the front and rear surfaces of the steel sheet 2 introduced from the coating amount measuring equipment 13 and 13, and thus can correct the shape in the Y transverse direction of the steel sheet 2 to the desired correction form 20. In this case, for example, using the correlation data held in the database 15 previously, the control equipment 14 calculates the positions in the Z-thickness direction of each portion along the transverse direction. Y of sheet steel 2 at the drying nozzle positions from the measured amount of coating of the front and rear surfaces of sheet steel 2. The correlation data is the data in which the current The relationship between the amount of coating with respect to the steel sheet 2 and the positions in the thickness Z direction of each portion along the transverse direction Y of the steel sheet 2 under various flow conditions are previously obtained experimentally or empirically. In addition, the control equipment 14 controls the electromagnet groups 12 and 12 based on the positions in the Z thickness direction of each portion in the Y transverse direction of the steel sheet 2 calculated from the amount of coating, applies the electromagnetic force to each portion in the transverse Y direction of the steel sheet 2, and corrects the shape in the transverse Y direction of the steel sheet 2 to the target correction shape 20.
[000144] In addition, each of the electromagnets 101 to 107 and each of the electromagnets 111 to 117 arranged to be opposite each other are established so that the steel sheet 2 is magnetically attracted to one side or both sides of each pair of electromagnets in the same position DNA transverse Y direction. For example, as shown in FIG. 3, in the pair of electromagnet 101 and electromagnet 111 of the transverse direction position opposite each other at one end of the steel sheet 2, the output of the electromagnet 111 positioned on a far side of the steel sheet 2 is set to be greater than the electromagnet output 107 positioned on one side close to steel plate 2. In addition, the electromagnet outputs are set so that one end of steel plate 2 is magnetically attracted by electromagnets 101 and 111 in one direction (direction of electromagnet 101 in the electromagnet direction 111) in which the shape of the transverse direction Y of the steel sheet 2 at the electromagnet position becomes the target correction shape 20 and shape correction is performed. Furthermore, when the pair of electromagnets is positioned at an equal distance from the corresponding portions of steel sheet 2 (i.e. when the portions of steel sheet 2 are positioned on centerline 22), as it is not necessary correcting the portions of steel sheet 2 in the Z-thickness direction, the outputs of the electromagnets are set to be equal to each other.
[000145] In addition, the control equipment 14 can establish the starting and stopping of the plurality of sensors 11 arranged along the transverse direction Y of the steel sheet 2, or of the coating amount measuring equipment 13 and the plurality of electromagnets 101 to 107 and 111 to 117, individually. When the width W of the steel sheet 2 is large (eg W = 1700 mm), the entire plurality of sensors 11 in the transverse direction Y is opposite to the steel sheet 2. In contrast, in a case where the width W of the steel plate 2 is small (eg W = 900 mm), when the steel plate 2 having a narrow width W passes, the sensors 11 positioned on the center position side of the plurality of sensors 11 are opposite the steel plate 2, but the sensors 11 arranged on either side of the ends are not opposed to the steel sheet 2. This is similarly applied to the plurality of coating amount measuring equipment 13 and the plurality of electromagnets 101 to 107 and 111 to 117 which are arranged along the transverse Y direction.
[000146] Consequently, in the present preferred configuration, for example, as a condition of passage of the steel plate 2, the control equipment 14 obtains the information of the width W of the steel plate 2 transported in the transport direction X, previously, and gives starting only the sensors, the coating amount measuring equipment, and the electromagnets that are actually opposite the steel sheet 2, between the plurality of sensors 11. the coating amount measuring equipment 13, and the plurality of electromagnets 101 to 107 and 111 to 117, based on the sheet width information W. Therefore, according to the width W of the steel sheet 2 processed by the continuous hot-dip metal coating equipment 1, the measurement of the position of each portion in the transverse Y direction of steel sheet 2, coating amount measurement, shape correction, or the like can be performed properly.
[000147] For example, in the example of FIG. 3, the pair of electromagnets 104 and 114 is arranged at the center in the transverse direction Y and, for example, the plurality of pairs of electromagnets 101 to 103, 105 to 107, 111 to 113 and 115 to 117 are arranged at 250 mm intervals in the transverse direction Y. In this case, with respect to the steel sheet 2 having the sheet width W = 900 mm, 3 pairs of electromagnets 103 to 105 and 113 to 115 from the central side can provide the electromagnetic forces. In addition, with respect to steel sheet 2 having a sheet width W = 1700 mm, all 7 pairs of electromagnets 101 to 107 and 111 to 117 can supply the electromagnetic forces.
[000148] The form 10 control equipment is configured as described above. According to the shape control equipment of the steel sheet 10, the shape in the transverse Y direction of the steel sheet 2 at the electromagnet positions is corrected to the desired correction shape 20 using each of the electromagnets 101 to 107 and 111 to 117, and thus the method of controlling the shape of the steel sheet according to the present preferred configuration is carried out, and the details will be described below. (3. FORM OF CORRECTION IN ELECTROMAGNET POSITION)
[000149] Next, the desired correction form 20 will be described when the shape of the steel sheet 2 is corrected by the control equipment of the shape of the steel sheet 10 in relation to FIG. 4. FIG. 4 is a schematic diagram showing the shape of the actual warp 21 and the desired correction shape 20 of the steel sheet 2 at the positions of the electromagnets according to the present preferred configuration. In FIG. 4, solid lines indicate the actual warp shapes 21 (hereinafter referred to as "measure warp shape 21") in the transverse direction Y of the steel sheet 2 at the positions of the electromagnets that are measured in the state where electromagnetic forces are not applied, and dashed lines indicate the desired correction shapes 20 in the transverse direction Y of the steel sheet 2 which are established by the control equipment 14 of the shape control equipment of the steel sheet 10.
[000150] As shown in FIG. 4, the control equipment 14 adjusts the increased correction shape 20 in the transverse direction Y of the steel sheet 2 in accordance with the measured warp shape (measured twist shape 21) in the transverse direction Y of the steel sheet 2 at the positions of the electromagnets. In the present preferred embodiment, the target correction shape 20 is set to a curved shape that is symmetric in the thickness Z direction to the measured warp shape 21. That is, the target correction shape 20 and the measured warp shape 21 are symmetric in the Z-thickness direction with the centerline 22 as the symmetry axis. Furthermore, a plurality of squares in FIG. 4 means the electromagnets 101 to 107 and 111 to 117 (refer to FIG. 3).
[000151] For example, in the cases of (a) and (b) of FIG. 4, the steel sheet 2 is subjected to so-called warping W at the portions of the electromagnets, and the measured warping shape 21 of the steel sheet 2 becomes a curved shape in the shape of W (irregular shape) having a plurality of irregularities. The amount of warp dM of the warp W is equal to or greater than a predetermined lower limit value dth. In this case, the correction shape of the warp 20 of the steel sheet 2 is set to a curved shape in the shape of a W which is symmetrical in the direction of thickness Z with the centerline 22 as the symmetry axis.
[000152] In addition, in the cases of (c) and (d) of FIG. 4, the steel sheet 2 is subjected to the so-called C-warp at the positions of the electromagnets, and the measured warp shape 21 of the steel sheet 2 becomes a C-shaped curved shape having a convex portion. The amount of warp dM of the C warp is equal to or greater than the predetermined lower limit value dth. In that case, the targeted correction shape 20 of the steel sheet 2 is set to a curved C-shaped shape that is symmetrical in the Z thickness direction with the centerline 22 as the symmetry axis.
[000153] On the other hand, in the cases of (e) and (f) of FIG. 4, the steel sheet 2 is substantially flat at the positions of the electromagnets, the measured warp shape 21 of the steel sheet 2 is hardly bent in the direction of thickness Z, and the amount of warpage dM is less than the predetermined lower limit value dth. In this case, the desired correction form 20, which is curved by the amount of warpage of the minimum value dth or more, cannot be established. Consequently, by adjusting IM or the arrangement of the cylinders in the bath as described below, the steel plate 2 at the electromagnet positions is curved in the transverse Y direction, and the shape in the transverse Y direction of the steel plate 2 at the electromagnet positions is adjusted so that the measured warp shape 21 is the curved shape having the amount of warp dM of the lower limit dth or more. Also, similar to items (a) to (d) of FIG. 4, the desired correction form 20 is established.
[000154] In this way, the control equipment 14 adjusts the desired correction shape 20 of the steel sheet 2 at the positions of the electromagnets to the curved shape that is symmetrical to the measured warp shape 21. In addition, the shape of the steel sheet 2 is corrected using a plurality of pairs of electromagnets 101 to 107 and 111 to 117 opposite the steel plate 2 so that the shape in the transverse direction Y of the steel plate 2 at the positions of the electromagnets is the desired correction shape 20 .
[000155] Thus, in the present preferred configuration, the shape in the transverse Y direction of the steel sheet at the positions of the electromagnets is not formed into a flat shape, and is positively corrected for curved shapes (irregular shapes) such as the C shape, the W shape, or the zigzag shape. The rigidity of the steel sheet 2 passing through the drying nozzles 8 and 8 and the electromagnet groups 12 and 12 can be increased. In addition, since the shape in the Y transverse direction of the steel sheet at the nozzle position can be close to a flat shape, the coating thickness in the Y transverse direction can be evened out by the drying nozzles 8 and 8m and the vibration of the sheet steel 2 transported in the X direction can be omitted.
[000156] Furthermore, even when the desired correction shape 20 is not set to a curved shape that is completely symmetrical to the measured warp shape 21, the rigidity of the steel sheet 2 is increased, and the effects that flatten the shape of the steel plate in the nozzle position and vibration suppression effects can be obtained. (4. METHOD OF CONTROLLING THE SHAPE OF STEEL SHEET)
[000157] The following describes a method of controlling the shape of steel sheet using the steel sheet shape control equipment 10 configured as above. (4.1 Full Flow of Sheet Steel Shape Control Method)
[000158] Initially the complete flow of the method of controlling the strength of the steel sheet according to the present preferred configuration will be described in relation to FIG. 5. FIG. 5 is a flowchart showing the method of controlling the shape of the steel sheet in accordance with the present preferred embodiment.
[000159] As shown in FIG. 5, initially the control equipment 14 adjusts the passing conditions of the steel sheet 2 in the continuous hot dip metal coating equipment 1 (S100). Here the flow conditions are conditions which are determined when the steel plate 2 raised from the coating bath 3 passes between the drying nozzles 8 and 8, the electromagnet groups 12 and 12, and the like. For example, the passing conditions include the thickness D of the steel plate 2, the width of the plate W, the tension T in the longitudinal direction (transport direction X) of the steel plate, the arrangements and sizes (diameter) of the cylinders in the bath such as the dip roller 5 or the support rollers 6 and 7, or the like.
[000160] Subsequently, the control equipment 14 adjusts the arrangements of the cylinders in the bath so that the Inter Mesh (IM) of the support cylinders 6 and 7 based on the pass conditions that are set in S100 (S102). After S102, the rollers in the bath such as the dip roller 5 and the support rollers 6 and 7 are established in the arrangement set out in S102. Since the support rollers 6 and 7 are not provided in the continuous hot dip metal coating equipment 1 according to the first preferred configuration shown in FIG. 1, it is not necessary to prepare and adjust the IM.
[000161] S102 will be described in detail. The control equipment 14 adjusts the disposition of the cylinders in the bath using the information stored in the database 15. The disposition information of the cylinders, which associates various flow conditions with a suitable value of the disposition of the cylinders in the bath such as IM, is stored in database 15. Cylinder layout information is the information that determines the proper cylinder layout values such as the IM for each pass condition based on a result of a previous operation or a test result determined by a tester of the continuous hot-dip metal coating equipment 1. The control equipment adjusts the appropriate arrangements of the dip roller 5 and support rollers 6 and 7, the appropriate size of the IM, or the like in accordance with the pass conditions such as plate thickness D, plate width W, or tension T set to S100 using cylinder arrangement information. For example, IM or similar is set such that the amount of dM warpage of the shape in the Y direction of steel sheet 2 at the electromagnet position is a value (eg 2.0 mm < dM < 20 mm) that is within a relatively large predetermined range. According to the arrangement of the cylinders, the steel plate 2 is bent in the transverse Y direction by the cylinders in the bath, and the shape in the transverse Y direction of the steel plate 2 at the electromagnet position becomes a curved shape.
[000162] Subsequently, the control equipment 14 adjusts the output current and the control parameter of each of the electromagnets 101 to 107 and 111 to 117 based on the passage condition and cylinder arrangement that are established in S100 and S102 (S104). For example, when the control system is a PID control, the control parameter is the control gain (a proportional gain Kp, an integration gain Ki, and a differential gain Kd) or similar of each of the electromagnets 101 to 107 and 111 to 117. Control equipment 14 adjusts each of the control gains Kp, Ki, and Kd to suitable values between 0% and 100% according to the established pass condition and cylinder arrangement
[000163] Also when the control gain is established, the control equipment 14 uses the information stored in the database 15. The control parameter information, which associates various passage conditions and the arrangement of the cylinders in the bath with the value The control parameter information is stored in the database 15. The control parameter information is information that determines the proper values of the control parameters such as the control gains Kp, Ki, and Kd for each pass condition and each cylinder arrangement, based on the result of a previous operation or the test result determined by a tester of the continuous hot-dip metal coating equipment 1. Control equipment 14 adjusts control parameters such as the gains of control adequate Kp, Ki, and Kd according to the flow conditions and cylinder arrangement set in S100 and S102 using the control parameter information.
[000164] In addition, the control equipment 14 adjusts the desired correction shape 20 in the transverse direction Y of the steel plate 2 in the position of the electromagnet based on the passage condition, cylinder arrangement, or similar established in S100 and S102 (S'106). The target correction shape 20 is a target shape in the transverse direction Y of the steel sheet 2 at the position of the electromagnet which is corrected by the electromagnets 101 to 107 and 111 to 117. The control equipment 14 adjusts from the target correction shape 20 to a curved shape corresponding to the warp shape (ie the measured warp shape described above 21) in the transverse direction Y of the steel sheet 2 at the position of the electromagnet. For example, the control equipment 14 adjusts the desired correction shape 20 to the shape (refer to FIG. 4) symmetrical in the direction of thickness Z to the measured warp shape 21. For example, the calculation process to establish the desired shape correction 20 is performed by performing a first numerical analysis using a sheet steel shape calculation software. In addition, the details of a method of establishing the desired correction form 20 at S106 will be described below (refer to FIG. 6 or similar).
[000165] In the first numerical analysis, initially the amounts of stress of the front and back surfaces of the steel sheet are calculated using a two-dimensional plane stress model. Next, a three-dimensional model is used to calculate the shape of the steel sheet in the transverse direction. At that time, as shown in FIG. 7, a three-dimensional model is used in which two non-existent cylinders (virtual cylinders) 16 and 17 are additionally arranged and the steel plate 2 moves between four arranged support cylinders. Here, the shape (the shape of the steel sheet at the nozzle position) in the transverse Y direction of the steel sheet 2 at the nozzle position is calculated by adjusting the thrust amount of the virtual cylinders to apply 70% of the calculated amount of stress by the two-dimensional model, and the desired correction shape 20 is established so that the shape of the steel plate at the nozzle position is close to a flat shape.
[000166] Subsequently, electromagnetic forces are applied to the steel sheet 2 by the electromagnets 101 to 107 and 111 to 117 according to the conditions set out in S 104 and S106 while making the steel sheet 2 actually pass through the continuous coating equipment of hot-dip metal 1 according to the pass condition and cylinder arrangement established in S100 and S104, and thus electromagnetic correction of the steel sheet 2 is performed (S108). In electromagnetic correction, the control equipment 14 controls the current flowing to each of the electromagnets 101 to 107 and 111 to 117 so that the shape in the transverse direction Y of the steel sheet 2 at the position of the electromagnet is corrected to the shape of target correction 20 established at S106, and thus the electromagnetic force is applied to the steel plate 2 by each of the electromagnets 101 to 107 and 111 to 117. Consequently, the actual shape in the transverse Y direction of the steel plate 2 in the position of the electromagnet is corrected to the desired correction form 20
[000167] Subsequently, the shape (hereinafter referred to as "shape of steel plate at sensor position") in the transverse direction Y of steel plate 2 at sensor position is measured by sensors 11 and 11 when steel plate 2 passes in the state where electromagnetic forces are applied as in S108 (S110). As described above, the sensor 11 is configured from the distance sensor or similar that measures the distance to the steel sheet 2 and can measure the position (displacement) in the Z thickness direction of each portion in the Y transverse direction of the steel sheet 2 at the sensor position. The control equipment 14 can calculate the shape of the steel sheet at the sensor position from the position information measured by the sensor 11.
[000168] Subsequently, the control equipment 14 calculates the shape (hereafter referred to as "shape of steel plate at nozzle position") in the transverse direction Y of steel plate 2 at nozzle position based on the shape of the steel plate in the position of the sensor measured in S110, in the condition of passage, and in the disposition of the cylinder, or similar (S112). For example, this calculation is performed by performing a first numerical analysis using the sheet steel shape calculation software. The control equipment 14 can obtain the shape of the steel sheet at the nozzle position from the shape of the steel sheet at the sensor position measured in S100 considering the conditions of sheet thickness D, sheet width W, of the tension T, the arrangement or sizes of the cylinders in the bath, etc.
[000169] Subsequently, the control equipment 14 determines whether the amount of warping dN of the steel sheet shape at the nozzle position calculated in S112 is less than a predetermined upper limit value dNmax (first upper limit value) (S114) or not . Here, similar to the amount of dM warpage of the steel sheet shape at the electromagnet position shown in FIG. 3, the amount of warping dN of the shape of the steel plate at the nozzle position means the length in the direction of thickness Z from the most protruding nut of the steel plate 2 at the nozzle position to the most recessed portion. Furthermore, the upper limit value dNmax of the amount of warping dN is the upper limit of the amount of warping at which the uniformity of coating thickness in the transverse direction Y at the nozzle position can be guaranteed.
[000170] In the present preferred configuration the value of the upper limit dNmax of the amount of warping dN is set to 1.0 mm. If the amount of warping dN of the steel sheet shape at the nozzle position is 1.0 mm or more, since the steel sheet shape at the nozzle position is not a flat shape, the coating thickness dispersion in the Y transverse direction of steel sheet 2 is increased, and the desired uniformity of coating thickness cannot be achieved. Consequently, it is determined whether the amount of warping dN of the steel sheet shape at the nozzle position is less than 1.0 mm at S 114 or not.
[000171] In addition, the control equipment 14 determines whether the amount of warping dR of the shape (hereinafter referred to as "shape of the steel sheet in a position of the electromagnet in the electromagnetic correction") in the transverse direction Y of the steel sheet 2 in the position of the electromagnet in the state where electromagnetic forces are applied are within a predetermined range (S116) or not. Here, similar to the amount of dM warpage of the steel sheet shape at the electromagnet position when electromagnetic correction is not performed as shown in FIG. 3, the amount of warp dR of the shape of the steel sheet at the electromagnet position in the electromagnetic correction means the length in the Z thickness direction from the most protruding portion of the steel sheet 2 at the electromagnet position to the lowered position. In addition, the predetermined range (lower limit value dRmin to upper limit value dRmax) of the amount of warping dR is the range of the amount of warping dR that is required to suppress the vibration of the steel sheet 2.
[000172] In the present preferred configuration, the lower limit value dRmin in the predetermined range of the amount of warpage dR is set to 2.0 mm, and the upper limit value dRmax is set to 20 mm. If the amount of warping dR is less than 2.0 mm, the rigidity of the steel plate 2 is insufficient, and there is a problem that the steel plate 2 easily vibrates in the nozzle position. Consequently, it is determined whether the amount of warpage dR of the shape of the steel sheet at the position of the electromagnet in the electromagnetic correction is 2.0 mm or more at S116. In addition, when steel sheet 2 is a wide steel sheet (for example sheet width W is 1700 mm or more), if the amount of warping dR exceeds 20 mm, there is a problem that the probability of the sheet of steel 2 electromagnetically corrected in the position of the electromagnet contacting the electromagnets 101 to 107 and 111 to 117 is increased. That is, the warp (C warp, W warp, or similar) is generated when the steel plate 2 passes around the dip roller 5 and support cylinders 6 and 7, but on the steel plate the amount of warp in that moment is increased. Consequently, the warping of the wide steel sheet in the electromagnet position is corrected to an inverse shape, and if the amount of warping dR exceeds 20 mm, there is a concern that the ends in the transverse Y direction of the wide steel sheet in the position of the electromagnet can contact electromagnets 101 to 107 and 111 to 117. Therefore, when steel plate 2 is the wide steel plate at S116m it is determined whether the amount of warping dR is 2.0 mm or more and 20 mm or less, or not.
[000173] When the amount of dN warpage of the steel sheet shape at the nozzle position is equal to or greater than the predetermined upper limit value dNmax (for example, 1.0 mm or more) as a result of the determination in S114, or when the amount of warp dR of the shape of the steel sheet at the position of the electromagnet in the electromagnetic correction is outside the predetermined range (eg less than 2.0 mm or more than 20 mm) as a result of the determination in S116m the processing in S118 is executed.
[000174] In S118, the control equipment 14 changes and resets the desired correction form 20 established in S106, or changes and resets the arrangement of the cylinders in the bath established in S102 (S118). At this point, either the desired form of correction 20 or the arrangement of the cylinders in the bath can be changed, or only one or both can be changed. However, the desired correction form 20 or the arrangement of the cylinders in the bath is changed so that the amount of dN warpage of the steel sheet shape at the nozzle position is less than the upper limit value dNmax (dN < 1m0 mm) and the amount of warpage dR of the shape of the steel plate at the position of the electromagnet in the electromagnetic correction are within the predetermined range (dR > 2.0 mm, and 2.0 mm < dR < 20 mm when the steel plate is a steel plate wide steel).
[000175] For example, when it is determined that the amount of warping dN of the shape of the steel sheet at the nozzle position at S114 is 1.0 mm or more, to decrease the amount of warping dN, the amount of warping dM of the shape Target correction 20 at the electromagnet position is reset to a smaller value. In addition, when it is determined that the amount of dR warping of the steel sheet shape at the electromagnet position in the electromagnetic correction of the wide steel sheet at S116 exceeds 20 mm, to decrease the amount of dR warping, the amount of dM warping of the Targeted correction shape 20 at the electromagnet position is reset to a smaller value by performing the first numerical analysis for the amount of warp dM (S118). The shape of the steel sheet is measured (S110 and S112) in the state where electromagnetic correction is performed on the steel sheet 2 to be the reset target shape correction 20 (S108), and the determination of S114 and S116 is retried .
[000176] For example, when it is determined that the amount of warping dR of the shape of the steel sheet at the position of the electromagnet in the electromagnetic correction in S116 is less than 2.0 mm, the arrangement of the immersion roller5 or support cylinders 6 and 7 provided in the coating bath is adjusted so that the amount of warping dR is increased. For example, the arrangement is adjusted to increase the IM of support cylinders 6 and 7, and thus the amount of warping dR of the steel sheet shape at the position of the electromagnet in the electromagnetic correction can be increased. In addition, the arrangement of the cylinders in the bath is adjusted as described above, the steel plate 2 passes through the cylinders, the shape of the steel is measured (S110 and S112) in the state in which the electromagnetic correction of the steel plate 2 is performed ( S108), and so the determination of S114 and S116 is retried.
[000177] As described above, in the present preferred configuration, when the actual amounts of warping dN and dR of the steel sheet shape of the electromagnet position or the nozzle position are not suitable under the condition that is initially established in S102 and S106 , the desired correction form 20 or the cylinder arrangement is set or reset to S118. Consequently, the amount of warping dN of the shape of the steel sheet at the nozzle position can be less than 1.0 mm, and the amount of warping dR of the shape of the steel sheet at the position of the electromagnet in the electromagnetic correction can be 2.0 mm or more and 20 mm or less.
[000178] After processing continuously up to above, processes (S120 to S126) are performed to suppress the vibration of steel plate 2 at the nozzle position.
[000179] Initially, the control equipment 14 measures the vibration in the Z thickness direction of the steel sheet 2 at the position of the sensors by sensors 11 and 11 (S120). I
[000180] Since the sensor 11 can measure the position (displacement) in the Z thickness direction of each portion in the Y transverse direction of the steel sheet 2 at the sensor position, if the position is continuously measured by the sensor 11, the amplitude and the vibration frequency in the Z-thickness direction of the steel sheet 2 at the sensor position can be obtained.
[000181] Subsequently, the control equipment 14 calculates the vibration in the Z-thickness direction of the steel sheet 2 at the nozzle position by performing a second numerical analysis based on the vibration in the Z-thickness direction of the steel sheet 2 at the position of the sensor measured in S120, in the pass condition, in the disposition of the cylinders, or similar (S122). The control equipment 14 can obtain the vibration of the steel plate 2 at the sensor position measured at S120 by considering the conditions of plate thickness D, plate width W, tension T, cylinder size arrangement in the bath, or similar.
[000182] In the second numerical analysis, as shown in FIG. 8, a virtual cylinder spring 18 is disposed in the X direction at the position in which the vibration of the steel sheet 2 is calculated, and the vibration of the steel sheet 2 is calculated using the spring constant of the cylinder spring 18.
[000183] Subsequently, the control equipment 14 determines whether the amplitude A of the vibration of the steel sheet 2 at the nozzle position calculated in S122 is less than a predetermined upper limit value Amax (second upper limit value) (S124) or not. Here, the upper limit value Amax of the amplitude A is the upper limit of the amplitude A at which the uniformity of the coating thickness in the transport direction X of the steel sheet 2 can be guaranteed. If the steel plate 2 is widely vibrated in the nozzle position, the distances between the drying nozzle 8 and the front and rear surfaces of the steel plate 2 are periodically increased or decreased according to the passage of the steel plate 2, and thus the dispersion occurs in the coating thickness in the X transport direction of the steel sheet 2.
[000184] In the present preferred configuration, the upper limit value Amax of amplitude A is set to 2.0 mm. Here, amplitude A is both amplitudes. If the amplitude A of the vibration of steel sheet 2 at the nozzle position is 2.0 mm or more, the dispersion of coating thickness in the longitudinal direction (transport direction X) of steel sheet 2 is increased, and the desired uniformity coating thickness cannot be guaranteed. Consequently, at S124, it is determined whether the amplitude A of the vibration of the steel sheet 2 at the nozzle position is less than 2.0 mm or not.
[000185] As a result of the determination in S124, when the amplitude A of the vibration of the steel sheet 2 at the nozzle position is equal to or greater than the upper limit value ANmax (eg 2.0 mm or more), processing from S126 is executed.
[000186] In S126, the control equipment 14 gradually decreases the control gains of the electromagnets 101 to 107 and 111 to 117 until the amplitude A of the vibration of the steel plate 2 at the nozzle position is decreased to be less than the threshold value higher ANmax (S126). For example, when the electromagnet control system is the PID control, the control equipment 14 gradually decreases the proportional gain Kp of the proportional operation (operation P) of the PID control as a control gain. Furthermore, at the moment amplitude A is decreased to be less than the upper limit value ANmax by continuously measuring the amplitude A while decreasing the proportional gain Kp, the control equipment 14 stops the decrease in the proportional gain Kp and resets Kp . Subsequently, the control equipment 14 controls the electromagnets 101 to 107 and 111 to 117 using the proportional gain Kp and other Kie Kd control gains.
[000187] The inventors diligently studied, and as a result found that the force (hereinafter referred to as "steel plate holding force") holding steel plate 2 by the electromagnetic force at the electromagnet position was weakened if the proportional gain Kp of the proportional operation (operation P) of the PID control was decreased, and thus the amplitude A of the vibration of the steel plate 2 at the nozzle position was decreased. Consequently, in the present preferred configuration, the amplitude A of the vibration of the steel sheet at the nozzle position is suppressed to be less than the upper limit value ANmax (eg less than 2.0 mm) by decreasing the proportional gain Kp as the control gains of electromagnets 101 to 107 and 111 to 117 (S126). Therefore, since the distances between the drying nozzles 8 and the front and rear surfaces of the steel sheet 2 can be approximately constant, the dispersion of coating thickness in the X transport direction of the steel sheet 2 is decreased, and so uniformity of coating thickness in the X transport direction can be guaranteed. (4.2 Specific Example of the Method of Establishing the Shape of the Sheet Steel)
[000188] Next, a method of establishing the desired correction form 20 in the transverse direction Y of the steel plate 2 in the position of the electromagnet at S106 of FIG. 5. For example, as a method of establishing the desired correction form 20, the following two methods can be exemplified. (1) Method of Measuring Sheet Steel Shape at Electromagnet Position
[000189] In the present method of establishment, when the steel sheet 2 passes through the state where electromagnetic correction is not performed, the warp shape 21 in the transverse direction Y of the steel sheet 2 at the position of the electromagnet is actually measured, and the desired correction shape 20 is set to the curved shape corresponding to the measured warp shape 21 (refer to FIG. 4). That method of establishment will be described in relation to FIG. 6. FIG. 6 is a flowchart showing a specific example of a method of establishing the desired form of correction 20 in accordance with the present preferred embodiment.
[000190] As shown in FIG. 6, initially the steel sheet 2 is transported in the continuous hot-dip metal coating equipment 1 in a state in which electromagnetic forces are not applied to the steel sheet 2 by the electromagnets 101 to 107 and 111 to 117 (S200) . Subsequently, the shape of the steel sheet at the position of the electromagnet when electromagnetic correction is not performed is measured by measuring the position in the Z thickness direction of each portion in the transverse Y direction of the steel sheet 2 at the electromagnet position by the position sensors 121 to 127 and 131 to 137 in the positions of the electromagnets (S202).
[000191] Subsequently, the control equipment 14 calculates the curved shape that is symmetric in the direction of thickness Z to the measured warp shape 21 at the positions of the electromagnets measured at S202, and adjusts the desired correction shape 20 at the position of the electromagnet to the symmetrical curved shape (S204). For example, as shown in FIG. 4, the desired correction shape 20 is set for the symmetrical curved shape in the thickness Z direction for the measured wick shape 21 with the centerline 22 as the symmetry axis.
[000192] As described above, in the present method of establishment, the desired correction shape 20 is established based on the shape of the steel sheet (measured warp shape 21) which is actually measured when the electromagnetic correction is not performed. Consequently, the desired correction shape 20 can be set properly according to the measured actual warp shape 21. Therefore, the shape of the steel plate at the nozzle position can be flat with high precision by the correction of the steel plate 2 for the desired correction shape 20 in the electromagnet position. (2) Method of Using the Database
[000193] Next, a method of establishing the desired correction shape 20 using the database 15 without actually measuring the shape of the steel sheet will be described.
[000194] The target shape information, which associates various passing conditions or the arrangement of the cylinders in the bath such as the IM with the target correction shape 20, is stored in the database 15. The target correction information is the information which determines the appropriate targeted correction form 20 for each pass condition and for each cylinder arrangement based on a previous operating result or a test result determined by a tester of continuous hot-dip metal coating equipment 1 Here, the appropriate target correction 20 is determined so that the amount of warping dN of the steel sheet shape at the nozzle position is less than the upper limit value dNmax (eg 1.0 mm) and the amount of warping dR of the shape of the steel sheet at the position of the electromagnet in the electromagnetic correction is within a predetermined range (eg 2.0 mm or more, and in the case of wide steel sheet, 2.0 mm or more and 20 mm or any less).
[000195] The control equipment 14 adjusts the appropriate target correction form 20 according to the flow conditions such as the thickness of the plate D, the width of the plate W, or the tension T set at S100 or the arrangement of the cylinders set in S102 using the desired correction shape information in the database 15. According to this method of establishment, the target correction shape 20 can be established quickly and easily without actually measuring the shape of the steel sheet. (5. CONCLUSION)
[000196] As described above, the steel sheet shape control equipment 10 in accordance with the present preferred embodiment and the method of controlling the steel sheet shape using the equipment are described in detail. According to the present preferred embodiment, the shape in the transverse Y direction of the steel sheet 2 at the position of the electromagnet is not corrected for flat shape, but is positively corrected for curved shape. At that moment, the electromagnetic forces generated by the electromagnets 101 to 107 and 111 to 117 or the arrangement of the cylinders in the bath so that the IM is adjusted so that the shape of the steel plate at the position of the electromagnet is irregular shapes such as the shape C, the W shape, or the zigzag shape in which the amount of warping dN is 1.0 mm or less. Consequently, the warp in the transverse Y direction of the steel plate 2 at the nozzle position is decreased, and the shape of the steel plate at the nozzle position can be flattened with high precision. Therefore, since the hot dip coating can be dried evenly in the transverse direction Y of the steel sheet 2 by the drying nozzles 8 and 8, the thickness of the coating in the transverse direction Y of the steel sheet 2 can be uniformed.
[000197] In addition, by positively bending the shape in the transverse direction Y of the steel plate 2 in the position of the electromagnet, the rigidity of the steel plate 2 transported in the transport direction X can be increased. Consequently, even when the steel plate is passed at a high speed, vibration in the Z-thickness direction of the steel plate 2 at the nozzle position can be adequately suppressed. Therefore, the change in coating thickness in the longitudinal direction (transport direction X) of the steel sheet 2 is decreased, and thus the coating thickness in the longitudinal direction can be smoothed out.
[000198] In addition, in the electromagnetic correction technology of the relative technique, it is difficult to suppress vibration having a high frequency that is equal to or greater than the frequency response of the electromagnet. However, according to the present preferred configuration, the rigidity is increased by bending the steel plate 2 into the position of the electromagnet, and thus it is also possible to adequately suppress vibration having a high frequency that is equal to or greater than the response of frequency of the electromagnet.
[000199] Furthermore, in the electromagnetic correction technology of the relative technique, if the steel sheet is held tightly by the electromagnetic force when the vibration of the steel sheet is suppressed by the electromagnetic force generated by the electromagnet, there is a problem that vibration occurs self-excited, which has the positions of adding electromagnetic force as protrusions on the steel plate. However, according to the preferred configuration, when vibration occurs in steel sheet 2, the holding force of the steel sheet generated by the electromagnetic force is weakened by the decrease in control gains (particularly the proportional gain Kp) of the electromagnets 101 to 107 and 111 to 117, and thus the vibration of the steel sheet can be adequately suppressed. EXAMPLE
[000200] Examples of the present invention will be described below. Furthermore, the Examples are just examples to confirm that the coating thickness of the steel sheet can be uniformed by controlling the shape of the steel sheet of the present invention, and the method of controlling the shape of the steel sheet and the control equipment. the shape of the steel sheet of the present invention are not limited to the Examples below.
[000201] Using continuous hot dip metal coating equipment 1 shown in FIG. 2, the coating test of steel sheet 2 was carried out by changing the passage conditions (thickness and width W of steel sheet 2, Inter Mesh (IM), and the established value of the amount of warping dM of the correction form (W-shape) of the steel plate 2 in the electromagnet position). As a result of the test, the amount of warping dN of the shape of the steel sheet at the nozzle position, the amplitude A of the vibration of steel sheet 2 at the nozzle position, and the coating amount in the transverse Y direction of the steel sheet 2 were measured. The test conditions and results are shown in Table 1 (Table 1) Coating Test Conditions and Results
(1) Comparison of Example 1 and Comparative Example 1
[000202] As shown in Table 1, in Example 1 of the present invention, when the steel plate 2 (steel plate size: plate thickness 0.75 mm x plate width 900 mm) was passed, the correction form The target 20 of steel sheet 2 was established so that the MI = 30 mm was satisfied and the amount of dM warpage in the W-shape of steel sheet 2 at the electromagnet position was 5 mm. As a result, the amount of dN warping of steel sheet 2 at the nozzle position was less than 1.0 mm, the amplitude A of the vibration of steel sheet 2 at the nozzle position was less than 2.0 mm, and the dispersion the amount of coating in the transverse Y direction was less than 10 g/m2 so as to be approximately uniform.
[000203] On the other hand, in Comparative Example 1, when the steel sheet 2 having the same size as in Example 1 was passed under the condition of MI = 30 mm, the desired correction shape 20 of the steel sheet 2 was established so that the amount of dM warpage in the W-shape of steel sheet 2 at the electromagnet position was 15 mm. As a result, the amount of warping dN of steel sheet 2 at the nozzle position was increased to be 1.0 mm or more, and the amplitude A of the vibration of steel sheet 2 at the nozzle position was less than 2.0 mm . Consequently, the dispersion of the coating amount in the Y transverse direction was 10 g/m2 or more.
[000204] As understood from the result of the comparison between Example 1 and Comparative Example 1, when the electromagnetic correction is performed on steel sheet 2 having the size described above, if the amount of warpage dM of the desired correction form in the electromagnetic position is set down to about 5 mm as in Example 1, the vibration amplitude A at the nozzle position can be suppressed to be less than 2.0 mm, and since the amount of warping dN of the steel plate 2 at the nozzle position nozzle can be less than 1.0mm, the coating thickness in the Y transverse direction can be evened out. On the other hand, if the amount of dM warpage of the desired correction form at the electromagnetic position is set to a large value such as about 15 mm as Comparative Example 1, since the amount of dN warpage of the steel sheet 2 at the position of the nozzle is increased, it is found that the coating thickness in the Y transverse direction cannot be sufficiently evened out. (2) Comparison of Example 2 and Comparative Example 2
[000205] As shown in Table 1, in Example 2 of the present invention, when the wide steel plate 2 (steel plate size: plate thickness 0.75 mm x plate width 1700 mm) was passed, the shape of Targeted correction 20 of steel sheet 2 was established such that IM = 40 mm was satisfied and the amount of dM warping in the W form of steel sheet 2 at the electromagnet position was 20 mm (= upper limit value dRmax of the amount of warping dR of the shape of the steel sheet at the position of the electromagnet in electromagnetic correction). As a result, the amount of warping dN of the steel sheet 2 at the nozzle position was less than 1.0 mm, the amplitude A of the vibration of the steel sheet 2 at the nozzle position was less than 2.0 mm. the dispersion of the coating amount in the Y transverse direction was less than 10 g/m2, and thus the coating thickness was substantially uniform in the Y transverse direction.
[000206] On the other hand, in Comparative example 2, when the wide steel sheet 2 having the same size as Example 2 was passed under the condition of MI = 40 mm, the desired correction shape 20 of the steel sheet 2 was set so that the amount of dM warping in the W-shape of steel sheet 2 at the electromagnet position was 25 mm. As a result, the amplitude A of the vibration of the steel sheet 2 at the nozzle position was less than 2.0 mm, the amount of warping dN of the steel sheet 2 at the nozzle position was increased to be 1.0 mm or more, and consequently the dispersion of the coating amount in the Y transverse direction was 10 g/m2 or more, and the dispersion occurred in the coating thickness in the Y transverse direction. electromagnet position was 25 mm, the wide steel plate 2 contacted the electromagnets, and there was a problem with the passage of the steel plate.
[000207] As understood from the result of the comparison between Example 2 and Comparative Example 2, when the electromagnetic correction is performed on the wide steel sheet 2 having the size described above, if the amount of warpage dM of the desired correction shape in the position of the electromagnet is set to about 20 mm as in Example 2, the amount of warping dN of the steel sheet 2 at the nozzle position is suppressed to be less than 1.0 mm, and the coating thickness in the transverse Y direction can be uniformed. On the other hand, if the amount of dM warping of the desired correction shape at the electromagnet position is set to a value that is very large, such as about 25 mm as in Comparative Example 2, the amount of dN warping of the plate shape of steel at the nozzle position is greatly increased and becomes 1.0 or more, and it is found that the coating thickness in the transverse Y direction cannot be sufficiently evened out. In addition, there is also the problem of the ends of the wide steel sheet 2 that contact the electromagnet. Consequently, when a wide steel sheet 2 is used such as a steel sheet having the sheet width = 1700 mm, it is preferable that the amount of dM warpage of the desired correction shape at the position of the electromagnet is set to be 20 mm or less so that the amount of warp dR of the steel sheet 2 at the electromagnet position is 20 mm or less. Consequently, the wide steel sheet 2 that contacts the electromagnet can be avoided. (3) Comparison of Example 3 and Comparative Example 3
[000208] As shown in Table 1, in Example 3 of the present invention, when the wide steel plate 2 (steel plate size: plate thickness 0.85 mm x plate width 1700 mm) was passed, the shape of Targeted correction 20 of steel sheet 2 was established such that IM = 10 mm was satisfied and the amount of dM warping in the W form of steel sheet 2 at the electromagnet position was 2 mm (= lower limit value dRmin of the amount of warping dR of the shape of the steel sheet at the position of the electromagnet in electromagnetic correction). As a result, the amount of dN warping of steel sheet 2 at the nozzle position was less than 1.0 mm, the amplitude A of the vibration of steel sheet 2 at the nozzle position was less than 2.0 mm, the dispersion of amount of coating in the transverse Y direction was less than 10 g/m2, and thus the thickness of the coating was substantially uniform in the transverse Y direction.
[000209] On the other hand, in Comparative Example 3 when the wide steel sheet 2 having the same size as in Example 3 was passed under the condition of MI = 10 mm, the desired correction shape 20 of the steel sheet 2 was established so that the amount of dM warping in the W-shape of steel sheet 2 at the electromagnet position was 1 mm. As a result, the amount of warping dN of steel sheet 2 at the nozzle position was increased to be 1.0 mm or less, but the amplitude A of the vibration of steel sheet 2 at the nozzle position was increased to be 1.0 mm or less, but the amplitude A of the vibration of the steel plate 2 at the nozzle position has been increased to be 2.0 mm or more. Consequently, the dispersion of the coating amount in the longitudinal direction (transport direction X) of the steel sheet 2 was 10 g/m2 or more.
[000210] As understood from the result of the comparison between Example 3 and Comparative Example 3, when the electromagnetic correction is performed on the wide steel sheet 2 having the size described above, if the amount of warpage dM of the desired correction shape in the position of the electromagnet is set to 2 mm, which is the lower limit value dRmin of the amount of warpage dR as in Example 3, the amplitude A of the vibration at the nozzle position is suppressed to be less than 2.0 mm, and the coating thickness in the longitudinal direction (transport direction X) of the steel plate 2 can be smoothed. On the other hand, if the amount of dM warpage of the desired correction shape at the electromagnet position is set to a very small value, such as 1 mm as in Comparative Example 3, since the rigidity of the steel sheet 2 is decreased and the steel sheet 2 is easily vibrated, the amplitude A of the vibration at the nozzle position becomes 2.0 mm or more, and so it is found that the coating thickness in the longitudinal direction of the steel sheet 2 cannot be sufficiently uniformed. Consequently, regardless of the width W of the steel plate 2, it is preferable that the amount of warping dM of the desired correction shape at the position of the electromagnet is set to be 2.0 mm or more so that the amount of warping dR of the steel plate steel 2 in the electromagnet position is 2.0 mm or more. Therefore, the amplitude A of the vibration of the steel sheet 2 at the nozzle position is suppressed to be less than 2.0 mm, and thus the coating thickness in the longitudinal direction of the steel sheet 2 can be uniform.
[000211] As described above, preferred embodiments of the present invention are described in relation to the accompanying drawings. However, the present invention is not limited to the preferred embodiments. It is obvious that a person skilled in the art of the present invention can devise various changes and modifications within the categories of technical ideas described in the claims, and it is understood that various changes and modifications fall within the technical range of the present invention. INDUSTRIAL APPLICABILITY
[000212] The present invention can be widely used in a steel sheet shape control equipment and a method of controlling the shape of the steel sheet, the warping and vibration of the steel sheet are suitably suppressed by optimizing the shape in the transverse direction of steel sheet, and coating thickness in transverse direction and longitudinal direction of steel sheet can be uniformed. DESCRIPTION OF REFERENCE SYMBOLS 1 continuous hot-dip metal coating equipment 2 steel sheet 3 coating bath 4 bath 5 dip roller 6, 7 support roller 8 drying nozzle 10 control equipment for the shape of the steel sheet 11 sensor 12 group of electromagnets 13 measuring equipment of coating quantity 14 control equipment 15 database 16 virtual cylinder 17 virtual cylinder 18 virtual cylinder spring 20 desired correction shape 21 measured warp shape 22 centerline 101, 102, 103, 104, 105, 106, 107 electromagnets 111, 112, 113, 114, 115, 116, 117 electromagnets 121, 122, 123, 124, 125, 126, 127 position sensor 131, 132, 133, 134, 135, 136, 137 position sensor X transport direction Y transverse direction Z thickness direction

权利要求:
Claims (20)
[0001]
1. Method of controlling the shape of the steel sheet which, in a continuous hot-dip metal coating equipment (1) which includes a drying nozzle (8) arranged to be opposed to the steel sheet (2) raised from the coating bath (3) and a plurality of pairs of electromagnets (12) arranged along the transverse direction on both sides in the direction of the thickness of the steel sheet (2) above the drying nozzle (8), controls the shape in the transverse direction of the steel sheet (2) by applying an electromagnetic force in the thickness direction in relation to the steel sheet (2) by electromagnets (12), the method characterized in that it comprises: (A) establishing the shape of Targeted correction in the transverse direction of the steel sheet (2) at a position of the electromagnet (12) to a curved shape by performing a first numerical analysis based on the pass condition including at least one selected from a thickness of steel sheet (2 ), one width of the steel plate (2), one ten are in the longitudinal direction of the steel sheet (2), arrangement of a cylinder (5, 6, 7) provided in the coating bath (3), and a cylinder size (5, 6, 7); (B) control the electromagnetic force applied to the steel plate (2) by controlling the current flowing to each of the electromagnets (12), so that the shape in the transverse direction of the steel plate (2) at the position of the electromagnet ( 12) is the curved shape defined in (A) in a state in which the steel sheet (2) is transported, and measure the shape in the transverse direction of the steel sheet (2) at a predetermined position between the drying nozzle ( 8) and the electromagnet or measuring the amount of coating of the hot-dip metal in relation to the steel plate (2) in the subsequent step of the electromagnet position; (C) calculate the shape in the transverse direction of the steel sheet (2) at the position of the drying nozzle (8) based on the shape or amount of coating measured in (B); (D) repeat (B) and (C) by adjusting the desired shape of correction to a curved shape having a different amount of warpage than the curved shape established in (A) by performing a first numerical analysis when the amount of warpage of the shape calculated in (C) is equal to or greater than a first upper limit value; (E) measuring the vibration in the direction of the thickness of the steel sheet (2) at a predetermined position where the amount of warping as calculated in (C) is less than the first upper limit value; (F) calculate the vibration in the direction of the thickness of the steel sheet (2) at the position of the drying nozzle (8) by performing a second numerical analysis based on the vibration measured in (E), and (G) adjust the gain controlling the electromagnet (12) by performing the second numerical analysis to make the vibration amplitude calculated in (F) be less than a second upper limit value when the amplitude is equal to or greater than the second upper limit value; wherein, in (A), the desired correction shape in the transverse direction of the steel plate (2) is set to the pass condition using a database (15) in which the desired correction shapes in the transverse direction of the plate of steel (2) for each passing condition are stored so that the amount of shape warping in the transverse direction of the steel plate (2) at the position of the electromagnet is within a predetermined range and the amount of shape warping in the transverse direction of the steel sheet (2) at the position of the cleaning nozzle (8) is less than the first upper limit value in the state in which the electromagnetic force is applied, a range of the amount of warping of the shape in the transverse direction of the sheet of steel (2) in the position of the electromagnet (12) in the state where the electromagnetic force is applied is 2.0 mm or more, and the first upper limit value is 1.0 mm, and the second upper limit value is 2 .0 mm.
[0002]
2. Method of controlling the shape of the steel sheet, according to claim 1, characterized in that the continuous hot-dip metal coating equipment (1) further includes one or more first sensors (11) which are arranged to be opposite the steel plate (2) above the drying nozzle (8) and below the electromagnet (12), and measure the position in the direction of the thickness of the steel plate (2), where, in (B) , the shape in the transverse direction of the steel sheet (2) at the position of the first sensor (11) is measured by the first sensor (11) in the state where the electromagnetic force is applied to the steel sheet (2) by the electromagnet (12) , and in that, in (E), the vibration in the direction of the thickness of the steel sheet (2) at the position of the first sensor (11) is measured by the first sensor (11) when the amount of warping as calculated in (C ) is less than the first upper limit value.
[0003]
3. Method of controlling the shape of the steel sheet (2) according to claim 1 or 2, characterized in that the continuous hot-dip metal coating equipment also includes a plurality of pairs of second sensors (121 -127, 131-137) which are arranged along the transverse direction on both sides in the direction of the thickness of the steel plate (2) at the position of the electromagnet (101-107, 111-117), and measure the position in the direction of the thickness of the steel plate (2), and where (A) includes: (A1) measuring the position in the direction of the thickness of the steel plate (2) at the position of the electromagnet (12) by the second sensor (121-127, 131-137) when the steel sheet (2) is transported in a state in which electromagnetic force is not applied to the electromagnet (101-107, 111-117); (A2) calculate the warping force in the transverse direction of the steel sheet (2) at the position of the electromagnet (101-107, 111-117) in the state where the electromagnetic force (101-107, 111-117) is not applied by the electromagnet, based on the position measured in (A1); and (A3) establish the desired correction shape for a curved shape corresponding to the warp shape calculated in (A2).
[0004]
4. Method of controlling the shape of the steel sheet (2) according to claim 3, characterized in that in (A3) the desired correction shape is established for a curved shape that is symmetric in the direction of thickness to shape of warpage calculated in (A2).
[0005]
5. Method of controlling the shape of the steel sheet (2) according to any one of claims 1 to 4, characterized in that in (D), the arrangement of a cylinder (5, 6, 7) is adjusted from so that the amount of form warping in the transverse direction of the steel plate (2) at the position of the electromagnet (12) is within the predetermined range and the amount of form warping in the transverse direction of the steel plate (2) in the direction of the drying nozzle (8) is less than the first upper limit value in the state in which the electromagnetic force is applied.
[0006]
6. Method of controlling the shape of the steel sheet (2) according to claim 5, characterized in that the cylinder includes an immersion roller (5) that converts the transported direction of the steel sheet (2) to a upper vertical side, and at least one support cylinder (5, 6) which is provided above the dip roller (5) and contacts the steel plate (2) carried to the upper vertical side, and in which, at (D ), the amount of thrust (IM) of the steel plate (2) by the support cylinder (5, 6) is adjusted so that the amount of warping of the form in the transverse direction of the steel plate (2) at the position of the electromagnet (12) is within the predetermined range and the amount of shape warping in the transverse direction of the steel sheet (2) at the position of the drying nozzle (8) is less than the first upper limit value in the state where the electromagnetic force is applied.
[0007]
7. Method of controlling the shape of the steel sheet (2) according to any one of claims 1 to 6, characterized in that in (D), (B) and (C) they are repeated by redefining the correction shape Targeted for a curved shape having the amount of warping less than that of the curved shape set forth in (A) when the amount of warping of the shape calculated in (C) is equal to or greater than the first upper limit value or when the amount of warping of the warp shape in the transverse direction of the steel sheet (2) at the position of the electromagnet (12) is outside a predetermined range.
[0008]
8. Method of controlling the shape of the steel sheet (2) according to any one of claims 1 to 7, characterized in that the first numerical analysis is performed using a virtual cylinder (16, 17).
[0009]
9. Method of controlling the shape of the steel sheet (2) according to any one of claims 1 to 8, characterized in that the amplitude of the steel sheet (2) is calculated using a spring constant in the second numerical analysis.
[0010]
10. Method of control of the shape of the steel sheet (2) according to any one of claims 1 to 9, characterized in that the control system of the electromagnet is a PID control, and in that, in (G), the amplitude is controlled by decreasing the proportional gain from a proportional operation of the PID control as the control gain.
[0011]
11. Sheet steel shape control equipment (10) which is provided in a continuous hot-dip metal coating equipment including a drying nozzle (8) arranged to be opposed to the steel sheet (2) raised from the coating bath (3), and which controls the shape in a transverse direction of the steel sheet (2) by applying an electromagnetic force in the thickness direction in relation to the steel sheet, the equipment (10), characterized in that comprising: a plurality of pairs of electromagnets (12) which are arranged along the transverse direction on both sides in the direction of the thickness of the steel sheet (2) above the drying nozzle (8); and a control equipment that controls the electromagnet, where the control equipment (14) is adapted to, (A) establish the desired correction shape in the transverse direction of the steel plate (2) at the position of the electromagnet (12) to a curved shape by performing a first numerical analysis based on the pass condition including at least one selected from a thickness of the steel sheet (2), a width of the steel sheet (2), a tension in the longitudinal direction of the steel sheet (2), arrangement of a cylinder (5, 6, 7) provided in the coating bath (3), and a cylinder size (5, 6, 7); (B) control the electromagnetic force applied to the steel plate (2) by controlling the current flowing to each of the electromagnets (12), so that the shape in the transverse direction of the steel plate (2) at the position of the electromagnet ( 12) is the curved shape defined in (A) in a state in which the steel sheet (2) is transported, and measure the shape in the transverse direction of the steel sheet (2) at a predetermined position between the drying nozzle ( 8) and the electromagnet or measures the amount of coating of the hot-dip metal in relation to the steel plate (2) in the subsequent step of the electromagnet position; (C) calculate the shape in the transverse direction of the steel sheet (2) at the position of the drying nozzle (8) based on the shape or amount of coating measured in (B), (D) repeat (B) and (C) ) by adjusting the desired form of correction for a curved shape having a warp amount different from the curved shape established in (A) by performing the first numerical analysis when the amount of warping of the shape calculated in (C) is equal to or greater than the first upper limit value, (E) measure vibration in the direction of the thickness of the steel sheet (2) at the predetermined position when the amount of warping as calculated in (C) is less than the first upper limit value, (F) calculate the vibration in the direction of the thickness of the steel sheet (2) at the position of the drying nozzle (8) by performing a second numerical analysis based on the vibration measured in (E), and (G) adjusting the control gain of the electromagnet (12) by performing the second numerical analysis to make the vibration amplitude calculate da in (F) be less than the second upper limit value when the amplitude is equal to or greater than the second upper limit value, where, in (A), the control equipment (14) is adapted to establish the shape of Targeted correction in the transverse direction of the steel sheet (2) for the pass condition using a database (15) in which the targeted correction forms in the transverse direction of the steel sheet (2) for each pass condition are stored from so that the amount of form warping in the transverse direction of the steel sheet (2) at the position of the electromagnet (12) is within a predetermined range and the amount of form warping in the transverse direction of the steel sheet (2) in the position of the cleaning nozzle (8) is less than the first upper limit value in the state in which the electromagnetic force is applied, a range of the amount of warping of the shape in the transverse direction of the steel plate (2) in the position of the electromagnet ( 12) in the state in which the electromagnetic force is applied is of 2.0 mm or more, and the first upper limit value is 1.0 mm, and the second upper limit value is 2.0 mm.
[0012]
12. Control equipment for the shape of the steel sheet according to claim 11, characterized in that it further comprises: one or more first sensors (11) are arranged to be opposed to the steel sheet (2) above the nozzle of drying (8) and below the electromagnet (12), and measures the position in the direction of the thickness of the steel sheet (2), where the control equipment is adapted to, in (B), measure the shape in the transverse direction of the sheet of steel (2) in the position of the first sensor (11) by the first sensor (11) in the state where the electromagnetic force is applied to the steel plate (2) by the electromagnet, and in (E), measure the vibration in the direction of the thickness of the steel sheet (2) at the position of the first sensor (11) by the first sensor (11) when the amount of warping as calculated in (C) is less than the first upper limit value.
[0013]
13. Control equipment for the shape of the sheet steel according to claim 11 or 12, characterized in that it further comprises: a plurality of pairs of second sensors (121-127, 131-137) that are arranged along the transverse direction on both sides in the direction of the thickness of the steel plate (2) at the position of the electromagnet (101-107, 111-117), and measures the position in the direction of the thickness of the steel plate (2), where the equipment control (14) is adapted to, when the desired correction shape is established in (A), (A1) measure the position in the direction of the thickness of the steel plate (2) at the position of the electromagnet (101-107, 111- 117) by the second sensor (121-127, 131-137) when the steel plate (2) is transported in a state where the electromagnetic force is not applied by the electromagnet (101-107, 111-117), (A2) calculate the warp shape in the transverse direction of the steel sheet (2) at the position of the electromagnet (101-107, 111-117) in the state where the electromagnetic force is not applied by the el. electromagnet (101-107, 111-117), based on the position measured in (A1), and (A3) establish the desired correction shape for a curved shape corresponding to the warp shape calculated in (A2).
[0014]
14. Control equipment for the shape of the steel sheet according to claim 13, characterized in that in (A3), the control equipment (14) is adapted to the desired correction shape to be established for a curved shape which is symmetric in the thickness direction for the warp shape calculated in (A2).
[0015]
15. Control equipment of the shape of the steel sheet according to any one of claims 11 to 14, characterized in that the control equipment (14) is adapted to, in (D), adjust the cylinder arrangement (5 , 6, 7) so that the amount of form warping in the transverse direction of the steel sheet (2) at the position of the electromagnet is within the predetermined range and the amount of form warping in the transverse direction of the steel sheet (2) in the position of the drying nozzle (8) it is less than the first threshold value in the state in which the electromagnetic force is applied.
[0016]
16. Control equipment for the shape of the steel sheet according to claim 15, characterized in that the cylinder includes an immersion roller (5) that converts the transported direction of the steel sheet (2) to an upper vertical side , and at least one support cylinder (6, 7) which is provided above the dip roller (5) and contacts the steel plate (2) transported to the upper vertical side, and where the control equipment (14) is adapted to, in (D), adjust the amount of thrust (IM) of the steel plate (2) by the support cylinder (6, 7) so that the amount of warping of the form in the transverse direction of the steel plate (2) at the position of the electromagnet (12) is within the predetermined range and the amount of shape warping in the transverse direction of the steel sheet (2) at the position of the drying nozzle (8) is less than the first upper limit value in the state in which electromagnetic force is applied.
[0017]
17. Control equipment of the shape of the steel sheet according to any one of claims 11 to 16, characterized in that the control equipment (14) is adapted to, in (D), repeat (B) and (C) ) by redefining the desired form of correction to a curved shape having an amount of warpage less than the curved shape established in (A) when the amount of warpage of the shape calculated in (C) is equal to or greater than the first threshold value higher or when the amount of warpage of the warp shape in the transverse direction of the steel plate (2) at the position of the electromagnet is outside the predetermined range.
[0018]
18. Control equipment of the shape of the steel sheet according to any one of claims 11 to 17, characterized in that the control equipment (14) is adapted to perform the first numerical analysis using a virtual cylinder (16, 17 ).
[0019]
19. Control equipment for the shape of the steel sheet according to any one of claims 11 to 18, characterized in that the control equipment (14) is adapted to calculate the amplitude of the steel sheet (2) using a constant spring in the second numerical analysis.
[0020]
20. Control equipment of the shape of the steel sheet according to any one of claims 11 to 19, characterized in that the control system of the electromagnet (12) is a PID control, and in which the control equipment (14 ) is adapted to, in (G), control the amplitude by decreasing the proportional gain of a proportional operation of the PID control as control gain.

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法律状态:
2018-03-06| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2018-03-13| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2018-03-20| B06I| Publication of requirement cancelled [chapter 6.9 patent gazette]|Free format text: ANULADA A PUBLICACAO CODIGO 6.6.1 NA RPI NO 2462 DE 13/03/2018 POR TER SIDO INDEVIDA. |

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2019-09-10| B25D| Requested change of name of applicant approved|Owner name: NIPPON STEEL CORPORATION (JP) |

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2019-12-24| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2020-10-06| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|

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2021-05-11| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-07-20| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 02/05/2013, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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JP2012-108500|2012-05-10|

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JP2012108500|2012-05-10|

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PCT/JP2013/062752|WO2013168668A1|2012-05-10|2013-05-02|Steel sheet shape control method and steel sheet shape control device|

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