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    • 专利摘要:
    METAL PLATE TO BE HEATED BY RADIANT HEAT TRANSFER AND PRODUCTION METHOD. OF THE SAME, AND METAL PRODUCT PROCESSED HAVING A PORTION WITH DIFFERENT RESISTANCE AND PRODUCTION METHOD OF THE SAMEIn part of a surface of a metal plate that must be heated by transferring radiant heat with a radius close to the infrared, a region is formed where the reflectance to the radiant radius is less than the original surface of the metal plate. As a treatment for reducing reflectance, painting or thermal spray in a blackish color, treatment to increase the surface roughness of the sheet metal, blasting, causticization, blackening, treatment of changing the quality of the sheet metal surface layer, or the like can be adopted. The metal sheet is transformed into a heated metal sheet having partly a different temperature because it is heated by radiant heat transfer and then the metal sheet is subjected to thermal processing accompanied by cooling, for example, by hot stamping.
    公开号:BR112012002706A2
    申请号:R112012002706-9
    申请日:2010-08-05
    公开日:2020-10-13
    发明作者:Yoshifumi Kobayashi；Kazuyuki Kawano；Yasunori Itoh；Shinichi Sukuki；Shintaro Yamanaka
    申请人:Nippon Steel Corporation；
    IPC主号:
    专利说明:

    Invention Patent Descriptive Report for "METAL PLATE TO BE HEATED BY RADIANT HEAT TRANSFER AND METHOD OF PRODUCTION OF THE SAME, AND METALLIC PRODUCT - PROCESSED HAVING A PORTION WITH DIFFERENT RESISTANCE AND METHOD OF PRODUCTION OF THE SAME". * Technical Field | The present invention relates to a metal sheet to be heated by excellent radiant heat transfer in working capacity and to a method of production thereof, and to a processed metal product I tend a portion with different resistance and a method of producing it. This application is based on, and claims priority benefit over, Japanese Patent Application No. 2009-183220, registered on '6 August 2008 and Japanese Patent Application No. 2009-183221, registered on 6 August 2009 whose complete contents are incorporated - here as reference.
    Fundamentals of the Technique Many mechanical components such as automotive structural components are produced by pressing a steel plate or other metal plates. However, products obtained through common cold pressing have the problem that elastic recovery is likely to occur due to their intrinsic stress and their dimensional accuracy is not stable. As a method to solve this problem, hot pressing called hot stamping has attracted attention. This hot stamping is a forming method in which a steel sheet previously heated to a predetermined temperature is shaped by pressing and is cooled in a pressing mold to be hardened. The use of this method avoids the occurrence of elastic recovery and allows the production of a molded product with high dimensional precision and resistance.
    To perform hot stamping, it is necessary to preheat the steel sheet to a temperature range in which its metallic structure becomes a single austenite phase. As a method of
    cement, a gas heating oven or similar is generally used, but the gas heating oven or similar is poor in productivity due to its low heating efficiency.
    Therefore, in order to increase productivity, the equipment needs to be large, leading to an increase in cost.
    Therefore, as a heating method that can increase productivity, Í has been proposed for heating by energization as described in Patent Document 1. This heating by energization is a method of heating a metal plate by a joule heat passing through a current through the metal plate bringing electrodes into contact with both ends of the metal plate, and has the advantage of using less energy and being able to heat up quickly.
    However, when the sheet metal shape is not square but a profile shape, the current is: concentrated in a portion with a small sectional area, which presents the problem that a desired region cannot be uniformly heated .
    Incidentally, to heat a specific portion of the metal sheet evenly, laser heating is conceivable, but this has problems with high equipment cost and poor productivity.
    Citation List Patent Literature Patent Literature 1: Japanese Laid-open Patent Publication nº 2004-55265 Patent Literature 2: Japanese Laid-open Patent Publication nº 2006-306211 Patent Literature 3: Japanese Laid-open Patent Publication nº2005-330504 Patent Literature 4: Japanese Laid-open Patent Publication No. 2006-289425 Patent Literature 5: Japanese Laid-open Patent Publication No. 2009-61473 Summary of the Invention Technical Problem Therefore, a first objective of the present invention is to provide a metal sheet to be heated by radiant heat transfer that can be easily heated to a desired temperature even when the reflectance of the metal sheet surface is high and a method for »producing it. : A second objective of the present invention is to provide a processed metal product having a portion with different strength that can be produced at low cost and with high productivity and has little restriction on the disposition of the portion with different resistance and a method production.
    Solution to the Problem A metal plate to be heated by radiant heat transfer according to the present invention is characterized by the fact that, in part of the surface of the metal plate to be heated by radiant heat transfer, a region of lower reduced reflectance is formed. in reflectance to a radiant radius than the sheet metal surface.
    In addition, the sheet metal can be a coated steel sheet.
    In addition, a method of producing a sheet metal to be heated by radiant heat transfer according to the present invention is characterized by the fact that part of the surface of the sheet metal to be heated by radiant heat transfer is subjected to the treatment. reflectance reduction in order to have reflectance at a radiant radius less than that of the original metal sheet surface.
    As a treatment for the reduction of reflectance, painting, wrinkling by blasting, lamination, laser, or similar, metallic coating by thermal coating or spraying, coloring and causticization by immersion in an acidic solution, treatment of change in the quality of the surface layer, and the like can be employed, but it is not limited to these methods.
    Note that the reflectance reduction treatment is preferably a blackish color treatment.
    In either case, the reflectance is 40% or less, preferably 30% or less, more preferably 25% or less.
    In addition, a processed metal product having a portion with different strength according to the present invention is characterized by the fact that a portion where the reflectance to the radiant radius is reduced is partially formed on a surface of the processed metal product, and the - difference in Vickers hardness between the portion where the reflectance to the radiant radius is reduced and the other portion is HV180 or more, preferably HV200 or “more.
    - In addition, a method of producing a processed metallic product having a portion with different resistance according to the present invention is characterized by the fact that the region where the reflectance to the radiant is reduced is formed in part of the surface of the metal sheet by treatment of the metal surface or treatment of change in the quality of the surface layer, the sheet metal is transformed into a partially heated sheet having a different temperature because it is heated by radiant heat transfer, and the heated sheet is subjected thermal processing accompanied by cooling.
    In the present invention, as a treatment for forming the region where the reflectance to the radiant radius is reduced in part of the surface of the metal sheet, paint, sandblasting, lamination, laser, or similar, metallic coating by coating or thermal spraying, coloring and causticization by immersion in an acidic solution, treatment of surface layer quality change, and the like, but it is not limited to these methods.
    In addition, in the present invention, thermal processing accompanied by cooling can be, for example, hot stamping, and can also be hardening. Advantageous Effects of the Invention According to the present invention, it is possible to increase the heating efficiency and intensively heat only a specific portion of a metal sheet by radiant heat transfer and at a lower cost and with greater productivity than conventionally. In addition, there are many advantages such as a greater degree of freedom in the design of components as a processed metal product.
    Brief Description of the Drawings [Figure 1] - Figure 1 is a perspective view showing an example of a metal plate entirely subjected to a treatment of - reflectance reduction. o [Figure 2] - Figure 2 is a perspective view showing an * example of a metal sheet partially subjected to a reflectance reduction treatment.
    [Figure 3] - Figure 3 is a diagram showing the production steps for a processed metallic product of the present invention.
    [Figure 4] - Figure 4 is a front view showing an example of a metal plate before being thermally processed into a processed metal product having a portion with different strength.
    "[Figure 5] - Figure 5 is a characteristic diagram showing the correlation of the heating temperature with the yield limit, the | 15 tensile strength, and the percentage of elongation after hardening.
    [Figure 6] - Figure 6 is a front view showing an example of a processed metal product having a portion with different resistance.
    [Figure 7] - Figure 7 is a perspective view showing an example of modification of the present invention.
    [Figure 8] - Figure 8 is a perspective view showing another example of modification of the present invention.
    [Figure 9] - Figure 9 is a characteristic diagram showing the correlation between the depth of the reflectance treatment and the heating rate.
    [Figure 10] - Figure 10 is a front view showing an example of a metal plate before being thermally processed into a processed metal product whose resistance has been made uniform.
    [Figure 11] - Figure 11 is a front view showing an example of a metal plate before being thermally processed into a processed metal product whose total strength is increased uniformly.
    Description of Configurations Hereinafter, a configuration of the present invention will be described in relation to the attached drawings.
    + (Sheet Metal Production to be Heated by Radiant Heat Transfer) 7 Figure 1 is a view showing a sheet metal 1 whose total surface is a region of reduced reflectance 2, and Figure 2 is a view showing a sheet metal whose surface is partially a reduced reflectance region 2.
    As shown in Figure 1 and Figure 2, in this configuration, the reflectance reduction treatment is applied to the surface of the sheet metal 1 to form the region of reduced reflectance 2. The sheet metal: ca 1 is a sheet metal that must be hot stamped in a later step, and is heated by radiant heat transfer with a radius close to the infrared or similar just before the hot stamping.
    Sheet metal type 1 is not particularly limited, but typical metal sheets to be hot stamped are hot-rolled steel sheets, cold-rolled steel sheets, and coated steel sheets. Here, coated steel sheets include steel sheets that have undergone hot dip galvanizing, hot dip galvanizing bonding, electroplating, electroplating bonding, hot dip aluminum plating, or alloy plating zinc containing Al, Mg, Si, Cr, Ni, or similar, but the coated steel sheet is not limited to any of these, as long as it is usable for hot stamping.
    Conventionally, when the shape of the metal plate is not a square but it has the shape of a profile, it was not possible to heat the energization to uniformly heat the entire metal plate because the current is concentrated in its portion with the smallest sectional area. Therefore, the present inventor experimented with a method of heating a metal sheet made of metal to a desired temperature by heating it.
    cement by radiant heat transfer using a near infrared lamp with a wavelength of 0.7 to 2.5 µm. This method can evenly heat the entire sheet metal. However, many of the - metal sheets used as structural components in automobiles and the like are hot-rolled steel sheets, cold-rolled steel sheets *, or coated steel sheets having undergone galvanizing or aluminum coating, and heating. them by radiant heat transfer is extremely slow in heating efficiency because most of the near infrared ray is reflected on a metal sheet surface. The present inventor cut a hot dip galvanized steel sheet that had a composition containing C: 0.22% by mass, Si: 0.15% by mass, Mn: 2.0% by mass, P: 0.02 % by weight or less,: S: 0.005% by weight or less, Ti: 0.023% by weight, Al: 0.035% by weight, B: 15 pom, and N: 20 ppm, with the balance being Fe and the unavoidable impurities had a sheet thickness of 1.6 mm, in a form with a short side of 170 mm and a long side of 440 mm, heated the resulting sheet by radiant heat transfer from 20ºC to 850ºC using a lamp near infrared, and measured the temperature of the steel plate. In this case, because of the high reflectance to the near infrared ray, the rate of temperature increase was 30ºC / s, but on a hot-rolled steel plate subjected to energization heating under the same condition, the rate of increase of the temperature was 58ºC / s. Thus, when the hot-dip galvanized steel sheet is heated by radiant heat transfer using the near infrared radius, the rate of temperature rise is very low, resulting in a high heating cost, low heating rate, and poor productivity.
    In addition, the present inventor experimented with a method in which a metal sheet was heated to a high temperature only in its specific portion and was hot stamped, with which the molded product was hardened locally. However, it is not easy for energizing heating or radiant heat transfer heating to intensively heat an arbitrary portion on the metal plate. In such a case, spot heating by laser beam is performed, but laser heating has problems requiring high equipment costs and being poor in productivity. Therefore, there was a demand for a technique capable of heating a - specific portion of a sheet metal at low cost and with high productivity CU Therefore, in this configuration, a surface of such sheet of high reflectance metal 1 is subjected to treatment of reflectance reduction to make the reflectance to the radiant radius as the radius close to the infrared smaller than that of the original surface of the metal sheet 1. As concrete methods of the reflectance reduction treatment, paint, blast wrinkling are used , lamination, laser or similar, metallic coating by thermal coating or spraying, staining and caustication: by immersion in an acidic solution, treatment of change in the quality of the surface layer, and the like, but the method is not limited to these methods . Note that the reflectance reduction treatment can only be applied to one surface of the sheet metal or can be applied to both its front and rear surfaces. In addition, to improve heating efficiency, it is preferable that the reflectance of the reduced reflectance region 2 is 40% or less, preferably 30% or less, more preferably 25% or less. Incidentally, reflectance was measured as follows: specifically using a UV-3100PC spectrophotometer and a large multi-purpose sample chamber MPC-3100 which are produced by Shimadzu, the parameters were corrected between 2400 and 300 nm Using BaSO, produced by Merck & Co., Ltd., a sample material was subsequently prepared, and the total reflection spectrum including diffuse reflection was measured at an angle of incidence of 8 degrees. The reflectance corresponding to a wavelength of the total reflection spectrum obtained was defined as the reflectance of the present invention.
    Painting in a blackish color is a method of reducing reflectance by painting the surface of sheet metal 1 with an organic or inorganic black dye. Note that the color does not have to be completely -
    black but it can be a blackish color. This mode can be easily implemented with just a cylinder or a spray gun. In addition, a suitable mask allows for easy painting of just one - arbitrary portion of sheet metal 1, but the use of a stamping method makes it possible to easily paint an arbitrary portion of sheet metal 1 * without a mask. In addition, when painting in a blackish color, for example, after degreasing the metal sheet surface with alcohol or similar, the metal sheet surface can be painted with, for example, Aqua-Black produced by Tokai Carbon.
    The wrinkling of the sheet metal surface is a method of reducing reflectance by shot blasting or rolling, each being a mechanical method, or by laser. In addition, in any of the: cases, a suitable mask allows the wrinkling of just an arbitrary portion of the metal sheet 1 to reduce the reflectance. In the case of the method using laser, only an arbitrary portion can be irradiated with laser without a mask to be wrinkled.
    In shot blasting, a shot no. 24, 40, 60, 80 is used, for example, and in rolling, the roughness of a reduction cylinder is adjusted according to the capacity of the laminator used. In the method using laser, there is no restriction on which of the transmitters of CO, YAG, fiber, and the like must be used, and the irregularities formed can be in the form of a lattice, in the form of a strip, or in the form of a sequence of points . It is preferable that irregularities are formed so that the surface roughness Ra is, for example, 0.6 µm or more, preferably 0.8 µm or more. The coating in a blackish color is a method of reducing the reflectance through, for example, black nickel electroless coating. In addition, a suitable mask allows only an arbitrary portion of the sheet metal 1 to be coated to reduce reflectance.
    Thermal spraying in a blackish color is a method of reducing the reflectance by plasma spraying of a blackened substance such as, for example, a thermal spray material based on AIZO3-TiO> Note that the color does not have to be black and it can be a blackened color. In addition, a suitable mask allows for easy thermal spraying on just an arbitrary portion of the sheet metal 1 to reduce reflectance. Staining by immersion in acidic solution is a method of reducing reflectance by blackening with, for example, an aqueous solution of oxalic acid. In addition, a suitable mask allows only an arbitrary portion of the metal plate 1 to be treated to reduce reflectance.
    Chemical etching is a method of reducing reflectance through, for example, a 10-second immersion method in a 10% aqueous HCl solution at 25ºC, followed by washing with water and drying. In addition, a suitable mask allows only an arbitrary portion of the metal plate 1 to be treated to reduce reflectance.
    The treatment of changing the quality of the surface layer is a method of reducing reflectance by immersion blackening method for 5 seconds in a 10% aqueous solution of nickel hexahydrate chloride at a temperature of 60ºC, followed by washing with water and drying. In addition, a suitable mask allows the treatment of only an arbitrary portion of the metal plate 1 to reduce reflectance. (Production of Processed Metal Product Having a Portion with Different Resistance) Automobile and similar structural components sometimes need to have high strength in their portions where a load is applied and does not have high resistance in other portions considering the capacity welding. Conversely, they sometimes need to have low strength only in specific portions. A processed metal product having such a portion with different strength can be produced using the procedure shown in Figure 3 using a metal plate 11 in which the reduced reflectance region is formed in the configuration described above. Incidentally, sheet metal 11 can also be obtained by the following method, instead of applying the DU—— Â n reflectance reduction treatment to a sheet metal obtained as a result of a cut or perforation by a press. Initially, before performing the cut or perforation by the press, the reflectance reduction treatment is applied to - a surface of a metallic material such as a steel strip to form to previously form a portion where the transfer efficiency of * Radiant heat is partially different. Then, it can be formed into sheet metal 11 by cutting or perforating in a press. In addition, in the example shown in Figure 4, the limit of the reduced reflectance region is clear, but it is also possible to form the reduced reflectance region in order to continuously change the efficiency of radiant heat transfer. In this case, the level of the reflectance reduction treatment is changed continuously or the treatment thickness in the direction of the plate thickness' is changed continuously.
    Then, the metal plate 11, having undergone the reduced reflectance treatment, is irradiated with, for example, a ray close to the infrared (wavelength of 0.7 to 2.5 µm), a medium infrared ray ( wavelength 4 to 1 mm), so that the entire metal plate 11 is evenly heated by radiant heat transfer. As heating equipment by radiant heat transfer that generates the near-infrared ray, the medium infrared ray, or the far-infrared ray, a gas heating oven, an electric heating oven, and common heating equipment are available including an infrared lamp, a heater near the infrared, and the like. Consequently, a central portion 12 where reflectance is reduced and thus the efficiency of radiant heat transfer is high, is rapidly heated. On the other hand, on the other peripheral edge portion 13, the reflectance is high and the efficiency of radiant heat transfer is low, and thus the heating rate is low. As a result, a heated metal plate is obtained in which the central portion 12 has a high temperature and the peripheral edge portion 13 has a relatively low temperature. Incidentally, when the heated sheet metal is hot-stamped, and the temperature of the high-temperature portion is increased,
    up to a value equal to or greater than the temperature at which the steel material transforms into a single austenite phase, but the temperature of the. low temperature is preferably maintained at a temperature at which the transformation to the austenite phase is not completed. The amount of spectrum that occupies a wavelength "of 2.5 μm or more in medium infrared heating or in heating far from infrared is about 50%. On the other hand, in heating near infrared, the amount of spectrum is of about 90% and thus a high energy density can be obtained, and therefore heating near infrared is more preferable as a heating method capable of heating at high speed. High-speed heating with radius near infrared it has a great effect on the reflectance difference of the metal plate 11 and makes it easier to make the metal plate 11 have a temperature difference. On the other hand, heating by i 15 a gas heating oven, an electric heating oven, an infrared lamp, or an infrared heater can reduce the temperature difference of the metal plate 11. Then the heated metal plate obtained is subjected to thermal processing at cooling companion. This can be simple hardening, but is preferably hot stamping. Hot stamping is a processing method of hardening within a forming mold, and is able to press with extremely low deformation and elastic recovery. When such thermal processing accompanied by cooling is performed, the central portion 12, whose temperature is increased to a value equal to or greater than the temperature at which the metallic structure of the steel material turns into a single austenite phase is hardened to have remarkably high strength, and the peripheral edge portion 13 in which the transformation to the austenite single phase has not been completed has substantially the original strength.
    Figure 5 is a diagram showing the temperature correlation of a heated metal sheet before hot stamping is started, with YP (yield strength), TS (tensile strength) and EL (percentage of elongation) ) after the hot stamping is finished. Note that the sheet metal is a steel sheet having a composition containing C: 0.22% by mass, Si: 0.15% by mass, Mn: 2.0%. by weight, P: 0.02% by weight or less, S: 0.005% by weight or less, Ti 0023% by weight, B: 15 ppm, Al: 0.035% by weight, and N: 50 ppm or * less, with the balance being Fe and the inevitable impurities, and its tensile strength at room temperature (hereinafter, simply resistance) is 600 MPa. As shown in Figure 5, when the hot stamping hardening is carried out after heating to 800 to 900ºC in which the metal structure is transformed into the single austenite phase, the resistance improves remarkably up to 1550 MPa. Incidentally, when the heating temperature is set to 700ºC or less in which the transformation in the austenite phase is not complete, even with the hot stamping hardening, no improvement in strength is recognized.
    Therefore, if the central portion 12 of the heated metal plate is set to a temperature equal to or greater than the temperature at which the metal structure turns into a single austenite phase and the peripheral edge portion 13 is adjusted to the temperature at which the transformation in the austenite single phase is not completed, only the central portion 12 can have high strength and the peripheral edge portion 13 can have the original resistance, which makes it possible to obtain a processed metal product having a portion with different resistance in which the difference in Vickers hardness is HV180 or more, preferably HV 200 or more. This processed metal product has high strength in the central portion 12 that receives a charge and has the original strength in the peripheral edge portion 13 that requires welding capability, and thus is used appropriately as automobile components. As described above, according to this configuration, it is possible to easily produce a processed metal product having a portion with different resistance.
    In addition, as previously described, by continuously changing the level of the reflectance reduction treatment or by continuously changing the treatment thickness in the direction of the thickness of the
    pa, it is possible to continuously change the efficiency of radiant heat transfer in the horizontal direction.
    Consequently, the rate of heating also changes and therefore it is possible to obtain a continuous time distribution. temperature when heating is ended.
    For example, as shown in Figure 6, on a sheet metal 14 being a galvanized steel sheet, the thickness of the reflectance reduction treatment of the central portion 15 is made large, the thickness of the treatment of a peripheral portion. ca 16 is made less than that of the central portion 15, and the reflectance reduction treatment is not applied to the peripheral edge portion 17. Then, the central portion 15 is heated to a temperature equal to or greater than the temperature in the which the metallic structure transforms into a single austenite phase, so that the peripheral portion 16 has a temperature close to the temperature at which the transformation to the single auspicious phase occurs and the peripheral edge portion 17 has a temperature at which the transformation in the austenite single phase is not complete.
    Consequently, it is possible to obtain a processed metal product having portions with different strengths in which the central portion 15 has the highest strength, the peripheral portion 16 is less in strength than the central portion 15 but is greater in strength than the peripheral edge portion 17, and the peripheral edge portion 17 have the original strength.
    This processed metal product has the highest strength in the central portion 15 that receives the highest load, has high strength in the peripheral portion 16 that receives the next highest load, and has the original strength in the peripheral edge portion 14 that requires capacity welding and is thus used properly as an automobile component.
    As described above, according to this configuration, it is possible to easily produce a metallic product
    ceased having portions with continuously different resistances.
    Note that the arrangement of the portion with different resistance is arbitrary, and the portion with different resistance can be arranged in a different position than the central position 12 of the metal plate 11 shown in Figure 4, and the central portion 15 and the peripheral portion 16 of sheet metal 14 shown in Figure 6. For example, as shown in
    Figure 7, folding positions can be holds with different strength so that the folded holds are reinforced, or the portion with different strength can be formed into a strip shape as shown in -. Figure 8. The advantages of the method of the present invention compared to the conventional method are summarized as follows.
    : If compared to a custom disc method in which, after metal sheets of different types are pre-welded to make a custom sheet metal, the custom sheet metal is processed, and the different resistance is partially transmitted, the method according to configuration does not require preliminary sheet metal processing and welding and does not require the use of a plurality of types of 'materials. Consequently, the cost of production is low. In addition, in the custom disc method, there is a restriction as to the position and number of weld lines that must be portions of changed resistance, but in this configuration there is no such restriction and the reflectance reduction treatment is performed with a mask in an arbitrary position, it is possible to form a portion with different resistance with an arbitrary shape in an arbitrary position.
    In addition, when compared to the selective hardening method before molding the component or after molding the component, the number of steps is lower and the equipment expense is lower, and therefore production costs become lower. . In addition, a degree of freedom in the shape and arrangement of a portion with different resistance is greater than that of the selective hardening method.
    As described above, according to this configuration, since it is possible to reinforce only a portion that requires strength in a single component, there is no need to reinforce the entire component, which makes it possible to reduce the component's weight. In addition, since a portion whose strength is not increased can be provided in a single component, welding with another component is facilitated. In addition, since warm conformation or conformation is used
    hot forming, there is also the advantage that the degree of freedom in the form of a component can be high and the deformation and elastic recovery can be reduced. - (Example 1) Table 1 summarizes the effects obtained when the treatment of reducing reflectance according to the present invention was applied to a metal plate.
    A steel plate with a thickness of 1.6 mm was cut into a shape with 170 mm short side and 440 mm long side and was heated by radiant heat transfer from 10ºC to 850ºC using a lamp close to the infra-red.
    The heating rate was found from the ratio of the temperature difference from 20ºC to 850ºC and the time needed for heating.
    Paragraphs * 1 to 10 are examples and paragraphs 11 and others are comparative examples. abela 1 Type of treatment, Meal- Fee - for concrete treatment fertores | Sheet metal Reduction factor Iquence reflectance &&) foci apply aqueous solution con- | | plating by immersion of carbon black submerged paint 13 Hot under hydrophilic treatment) | (Aqua-Black by Tokai Carbon) coating Igalvanization by immersion in black nickel coating) | metallic - by 13.5 hot lelectroless.
    Igalvanization coating by immersion al | grit liateranide hot rinse (Ra = 0.8um) lApply polyester-based paint to immersion in ttermelamine containing powder del 37 | carbon carbon | Apply polyester-based paint to immersion in thermamine paint containing / 17 35 hot aluminum nitride
    Type of treatment | Refle- Rate of concrete treatment contents- Nº - jMetallic plate tos - lrefectância &) hoccs jApply polyester-based paint | | galvanizing by immersion a | Iter / melamine paint containing ferrous hot lime | Apply polyester-based paint, Igter galvanization by Iter / melamine / 16 35 oxide powder hot (changing iron - —delimersion in aqueous solution Igalvanization by immersion ajquality - nickel chloride hexahydrate | 132 hot layer of soil at a temperature of 60ºC and with 'surface (10% concentration Immersion in aqueous solution | Caustication by | immersion in | hydrochloric acid with immersion in | immersion in | 33 23 | hot temperature of 25ºC and with acidic solution Itration of 10% Coating Plasma spraying with | | ajmetal dip galvanizing by thermal spray material- EK) Imica hot spray based on ALOs-TiO, thermal Steel sheet cold rolled) (uncoated) untreated steel sheet untreated 'untreated 57 22 2 - hot (uncoated) (steel sheet galvanized by | 8 - hot liming bonded' untreated (galvanized steel sheet) por Untreated 7o 17 hot immersion | Aluminum coated sheet) Untreated 73 nn | by hot immersion
    In addition, in the present invention, it is possible to form the reduced reflectance region 2 only on a specific portion of the metal sheet 1 by masking as shown in Figure 2. - As described above, according to the present invention, it is only necessary to form the reduced reflectance region 2 on a specific portion 7 of sheet metal 1 and heat sheet metal 1 by radiant heat transfer, and therefore, compared to laser heating, it is possible to obtain a molded component having partly different resistance without any increase in equipment cost and high productivity. If compared to the conventional custom made disc component, there are many advantages, such as that it can be manufactured at low custom, a portion with different strength can be freely arranged, and only one material of a single type is needed.
    (Example 2) A hot dip galvanized steel sheet having a composition containing C: 0.22% by mass, Si: 0.15% by mass, Mn: 2.0% by mass, P: 0.02% by weight or less, S: 0.005% by weight or less, Ti: 0.023% by weight, Al: 0.035% by weight, B: 15 ppm, and N: 50 ppm or less, with the balance being Fe and the inevitable impurities and having a thickness of 1.6 mm, it was cut in the same way as shown in Figure 4. It has a size of 100 mm on the short side, 170 mm on the long side, and a height of 440 mm. Following 0.6 gym blackening process in which an aqueous solution of nickel chloride hexahydrate was applied, followed by washing with water and drying was applied to a central portion 12 of the hot dip galvanized steel sheet, thus forming a portion having reduced reflectance and increased efficiency of radiant heat transfer. A peripheral edge portion 13 was not blackened.
    Then, the hot-dip galvanized steel sheet with blackening was heated by heating equipment close to the infrared so that the central portion 12 was quickly heated to a temperature increase rate of 120ºC per second. At that time, the adjusted temperature was 850ºC. As a result, the central portion 12 was heated to 852 ° C but the final temperature of the peripheral edge portion 13 where the efficiency of radiant heat transfer was low was 228 ° C. Then, for a hot stamping equipment. Whose forming load was 200 t, the heated steel sheet was stamped hot and was hardened in a mold in the conventional manner.
    O When the tensile strength (TS) of the compact was measured, the strength (TS) of the central portion 12 of the obtained compact reached 1470 MPa, but the strength of the peripheral edge portion 13 was 590 MPa which is substantially the same as that of hot-dip galvanized steel sheet which is the raw material, and thus it was possible to form a portion with different resistance in the same component. The compact manufactured in this example is used as a structural component for automobiles such as, for example, a reinforcement of the central pillar, and it is seen from the above result that its high strength region is an overloaded region and its peripheral edge portion is excellent in weldability. As described above, the use of the compact manufactured in this example can facilitate spot welding or the like with other components. In addition, since the compact manufactured in this example is reinforced only in one required portion, it can have a reduced weight and can be produced at low cost.
    Figure 9 is a characteristic diagram showing the correlation between the amount of blackness and the rate of heating when the metal plate has undergone blackening as the reflectance reduction to which a 10% aqueous solution of nickel chloride hexahydrate was applied, followed by washing with water and drying, it was heated by a ray near the infrared. As shown in Figure 9, it is seen that the heating rate improves as the blackness thickness is increased. Note that the sheet metal having the characteristics shown in Figure 9 is a steel sheet having a composition containing C: 0.22% by weight, Si 0.15% by weight, Mn: 2.0% by weight, P : 0.02% by weight or less, S: 0.005% by weight or less, Ti: 0.023% by weight, Al: 0.035% by weight, B: 15 ppm, and N: 50 ppm or less, with balance being Fe and iknei-
    impurities are possible, and the resistance at room temperature is 600 MPa. (Example 3) A hot dip galvanized steel sheet having a. same composition as that of the hot-dip galvanized steel sheet used in example 2 and having a thickness of 1.6 mm was cut into the * shape shown in Figure 6. It was 100 mm in size on the short Aldo, 170 mm on the side long, and a height of 440 mm. Then, the central portion 15 and the peripheral portion 16 of the hot-dip galvanized steel sheet were subjected to blackening in which a 10% aqueous solution of nickel chloride hexahydrate was applied, followed by washing with water and drying. At that moment, the central portion 15 was subjected to 0.6 g / m Blackening, and the peripheral portion 16 was subjected to 0.3 g / m Blackening, thus forming portions where the reflectance was decreased and the efficiency of radiant heat transfer was increased as shown in Figure 6. The peripheral edge portion 17 was not blackened.
    Then, the hot-dip galvanized steel sheet with blackening was heated by heating equipment close to the infrared so that the central portion 15 was quickly heated to a rate of temperature increase of 120ºC / s. At that time, the adjusted temperature was 850ºC. As a result, the central portion 15 was heated to 852 ° C but the peripheral portion 16 where the thickness of the blackening was less than that of the central basement 15 was heated to 800 ° C. On the other hand, the final temperature of the peripheral edge portion 17, where the efficiency of radiant heat transfer was low, was 228ºC. Then, by a hot stamping equipment whose forming load was 200 t, the heated steel sheet was hot stamped and was hardened in a mold in a conventional manner.
    When the tensile strength (TS) of the compact was measured, the strength (TS) of the central portion 15 of the compact obtained reached 1470 MPa and the strength (TS) of the peripheral portion 16 reached 1000 MPa. On the other hand, the resistance of the peripheral edge portion 17 was 590 MPa, which was substantially the same as that of hot-dip galvanized steel sheet which is the raw material, and thus it was possible to form portions with different resistances in the same component.
    The compact manufactured in that. example is used as a structural component for automobiles such as, for example, a central pillar reinforcement, and is seen from the result above ”which is a region of high strength is an overloaded region and its peripheral edge portion is excellent in capacity welding.
    As described above, the use of the compact manufactured in this example can facilitate spot welding or the like with other components.
    In addition, since the compact manufactured in this example is reinforced only in the necessary portions, it can have a reduced weight and can be produced at low cost. (Reference Example) A hot-dip galvanized steel sheet having - the same composition as that of the hot-dip galvanized steel sheet used in example 2 and having a thickness of 1.6 mm was cut as shown in Fig , 10. It was 135 mm wide and 440 mm long.
    Then, the entire surface of the metal plate 8 made of hot dip galvanized steel plate was subjected to 0.6 g / m in which a 10% aqueous solution of nickel chloride hexahydrate was applied for five seconds, followed by washing with water and drying, thus applying the treatment to reduce reflectance and increase the efficiency of radiant heat transfer.
    Then, the metal plate 8, having undergone blackening, was heated rapidly at a rate of temperature increase of 120ºC / s by a heating equipment close to the infrared.
    At that time, the adjusted temperature was 850ºC.
    As a result, the entire surface of sheet metal 8 was heated to 852ºC.
    So. by a hot stamping equipment, whose forming load was 200 t. the heated plate 8 was hot stamped and hardened in a mold as in the conventional manner.
    When the tensile strength (TS) of the compact was measured, the strength (TS) of the entire compact obtained reached 1470 MPa.
    Although a portion with a different strength is not formed, heating was possible at a higher rate than that when the surface of the plate. hot dip galvanized steel being the raw material left as it was.
    The compact manufactured in the reference example is used as a frame component for automobiles such as, for example, a side sill.
    The compactness made in the reference example is reinforced over the entire region, can have a low weight, and can be produced at low cost. (Comparative Example) A hot-dip galvanized steel sheet having the same composition as example 2 and having a thickness of 1.6 mm was cut to the shape shown in Figure 11. It was 135 mm wide and 440 mm in length.
    Then, sheet metal 9 was not blackened to reduce reflectance and was heated under the same conditions as those in example 2 by heating equipment near infrared.
    At that time, the adjusted temperature was 850ºC.
    As a result, it took 2.5 times longer than the time required in example 2 for the entire surface of the metal plate 9 to be heated to 852 ° C.
    Then, by a hot stamping equipment whose forming load was 200 t, the heated steel sheet 9 was hot stamped and was hardened in a mold in the conventional manner.
    When the tensile strength (TS) of the compact was measured, the strength (TS) of the entire compact obtained reached 1470 MPa.
    Although a portion with a different resistance was not formed, the temperature rise was low and took a long time because the blackening to reduce reflectance was not performed.
    The compact manufactured in the comparative example is used as a structural component for automobiles such as, for example, a side sill.
    The compact manufactured in the comparative example is entirely reinforced and is capable of light weight, but is low in productivity and cannot be produced at low cost.
    Industrial Applicability In accordance with the present invention, the absorption capacity for a near infrared ray is increased in a reflecting region. reduced amount where the reflectance to the near-infrared ray is made "less than that of the original surface of a metal sheet, which can" increase the heating efficiency. Therefore, it is possible to intensively heat only a specific portion of the metal sheet per radiant heat transfer at low cost and with higher productivity than conventionally.
    In addition, according to another characteristic of the present invention, the specific portion of a metal plate is painted in a blackish color, blasting wrinkling, lamination, similar iu 'laser, metallic coating through coating or thermal spraying, coloring and causticization by immersion in an acidic solution, treatment of change in the quality of the surface layer, or similar, it is possible to produce the metal sheet described above, which must be heated by radiant heat transfer. , at low cost. In addition, according to another feature of the present invention, the treatment in which a portion having partially different radiant heat transfer efficiency is formed on a metal sheet surface is combined with radiant heat transfer heating, with which the temperature of the metal plate is intentionally exchanged, and subsequently the metal plate is subjected to thermal processing accompanied by cooling such as hot stamping or hardening, which makes it possible to produce a processed metal product having a portion with different resistance. Using paint, sandblasting, lamination, laser, or similar, metallic coating by thermal coating or spraying, coloring and causticization by immersion in an acidic solution, treatment of change in the quality of the surface layer, or similarly, the treatment to make the efficiency of radiant heat transfer partially different on the surface of the metal sheet can be carried out at low cost, and therefore does not increase the cost much.
    In addition, these treatments can be carried out with high productivity and in addition, as a portion where the efficiency of radiant heat transfer is partially different, a po-. Arbitrary location can be selected, which has many advantages such as an increased degree of freedom in component design. ”List of Reference Signals 1 metal plate 2 reduced reflectance region 11.14 metal plate 12.15 central portion 13.17 peripheral edge portion 16 peripheral portion
    权利要求:
    Claims (13)
    [1]
    1. Sheet metal to be heated by radiant heat transfer, where the region of reduced reflectance, where the reflectance for a radius. radiant is reduced, it is formed in part of the surface of the metal sheet that must be heated by radiant heat transfer.
    [2]
    O 2. Sheet metal to be heated by heat transfer according to claim 1, where the reflectance of the reduced reflectance region is 40% or less.
    [3]
    3. Sheet metal to be heated by heat transfer according to claim 1, where the sheet metal is a coated steel sheet.
    [4]
    4. Method of producing a sheet metal to be heated by radiant heat transfer, where part of the surface of the sheet metal to be heated by radiant heat transfer is subjected to a reflectance reduction treatment in order to have reflectance reduced to a radiant radius.
    [5]
    5. Method for producing sheet metal to be heated by radiant heat transfer according to claim 4, where the reflectance reduction treatment reduces the reflectance up to 40% or less.
    [6]
    6. Method of producing sheet metal to be heated by radiant heat transfer according to claim 4, where the reflectance reduction treatment is one between painting, wrinkling, metallic coating, coloring by immersion in acidic solution, and caustication.
    [7]
    7. Method of producing sheet metal to be heated by radiant heat transfer according to claim 4, where the treatment of reducing reflectance is a treatment for changing the quality of the surface layer;
    [8]
    8. Processed metal product having a portion with different strength, where the portion where the reflectance to the radiant radius is reduced is partially formed on a surface of the processed metal product, and the difference in Vickers hardness between the portion where the reflectance to the radius radiant is reduced and the other portion is HV 180 or more.
    [9]
    9. Processed metallic product having the portion with different strength according to claim 8, where the difference in Vickers hardness between the portion where the reflectance to the radiant radius is reduced and the other por-. tion is HV 200 or more.
    [10]
    10. Method of production of a processed metallic product ”having a portion with different resistance, where the region where the reflectance to the radiant radius is reduced is formed in part of a surface of the metallic plate by treatment of the metallic surface or by treatment of quality change of the surface layer, the metal sheet is transformed into a heated metal sheet having partly a different temperature because it is heated by radiant heat transfer, and the heated metal sheet is subjected to thermal processing accompanied by * cooling .
    [11]
    11. Method of production of processed metallic product having the portion with different resistance according to claim 10, where the treatment of the metallic surface is one between painting, wrinkling, metallic coating, coloring by immersion in acidic solution, and caustication.
    [12]
    12. Method of production of processed metallic product having the portion with different resistance according to claim 10, where the thermal processing accompanied by cooling is hot stamping.
    [13]
    13. Method of production of processed metallic product having the portion with different resistance according to claim 10, where the thermal processing accompanied by cooling is hardening.
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    同族专利:
    公开号 | 公开日
    WO2011016518A1|2011-02-10|
    JPWO2011016518A1|2013-01-17|
    KR101411665B1|2014-06-25|
    EP2463395B1|2019-10-30|
    EP2463395A1|2012-06-13|
    JP2011152589A|2011-08-11|
    KR20120035933A|2012-04-16|
    US10060017B2|2018-08-28|
    CN102482741A|2012-05-30|
    EP2463395A4|2016-06-22|
    US20120135263A1|2012-05-31|
    JP5114686B2|2013-01-09|
    ES2761918T3|2020-05-21|
    MX2012001553A|2012-05-23|
    PL2463395T3|2020-04-30|
    JP4772929B2|2011-09-14|
    CN102482741B|2013-10-16|
    MX343388B|2016-11-04|
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    法律状态:
    2020-11-10| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-11-24| B25D| Requested change of name of applicant approved|Owner name: NIPPON STEEL AND SUMITOMO METAL CORPORATION (JP) |
    2020-12-15| B25D| Requested change of name of applicant approved|Owner name: NIPPON STEEL CORPORATION (JP) |
    2021-02-02| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-05-18| B11B| Dismissal acc. art. 36, par 1 of ipl - no reply within 90 days to fullfil the necessary requirements|
    2021-11-23| B350| Update of information on the portal [chapter 15.35 patent gazette]|
    优先权:
    申请号 | 申请日 | 专利标题
    JP2009183220|2009-08-06|
    JP2009183221|2009-08-06|
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    JP2009-183221|2009-08-06|
    PCT/JP2010/063291|WO2011016518A1|2009-08-06|2010-08-05|Metal plate for radiation heating, process for producing same, and processed metal having portion with different strength and process for producing same|
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