• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    METHOD FOR THE PRODUCTION OF CENTRAL COLUMN REINFORCEMENT. The present invention relates to a central column reinforcement that is produced satisfactorily using a high tensile strength material that has low ductility as a mold. The central column reinforcement is produced when performing a first step to produce a first formed intermediate product in which a body is partially formed by pressing the mold by using a first press forming device for stretching, and a second step for press the first intermediate formed product using a second press forming device for bending forming.
    公开号:BR112015006456B1
    申请号:R112015006456-6
    申请日:2013-09-26
    公开日:2020-08-25
    发明作者:Takashi Miyagi；Yasuharu Tanaka；Misao Ogawa；Toshimitsu Aso；Kei Misawa；Hiroshi Yoshida；Kazuhiko Honda
    申请人:Nippon Steel Corporation；
    IPC主号:
    专利说明:

    [0001] [001] The present invention relates to a method for producing a central column reinforcement. More particularly, it refers to a method for producing a central column reinforcement, which is a reinforcing member for a central column, which is a structural portion of an automobile body wrap, is produced by pressing cold or hot with the formation of a mold, which is a sheet metal such as a steel sheet. Background Technique
    [0002] [002] A car body wrap has a monocoque structure that is obtained by joining many formed panels and structural members, which are produced by forming by pressing one sheet metal to another. A central column (column B) is known as one of these structural members. The central column is an important structural member that is placed between a lateral stringer (indentation) that forms the side of the body and a roof rail. A central pillar (a) supports the locking mechanism of a front door and supports a rear door in a way that opens / closes freely, (b) ensures flexural rigidity and torsional rigidity of the body wrap during movement of the car, and (c) ensures a survival space for passengers in a side collision. Normally, the central column is formed by joining an external panel of the central column, an internal panel of the central column, and a central column reinforcement, which is a reinforcement member disposed between these panels (for example, by spot welding) three folded sheets).
    [0003] [003] The central column reinforcement includes a body that is long and curved and has two substantially T-shaped sections formed on both end parts in the longitudinal direction (top to bottom direction) of the body and therefore the reinforcement central column is a panel formed that takes on an external shape substantially in I-shape in a plant view.
    [0004] [004] The body has a cross-sectional shape such as a substantially hat shape formed by a curved and long top sheet, two vertical walls formed in order to connect with both parts of the edge in the direction of the width of the top sheet, and external flanges formed in order to connect with the two respective vertical walls.
    [0005] [005] Of the two substantially T-shaped sections, where the substantially T-shaped section arranged at the top of the central column reinforcement is joined to any other member of the structure such as a reinforcement of the side rail of the ceiling, and the a substantially T-shaped section disposed in the lower part of the central column reinforcement is joined to any other member of the structure such as an external reinforcement of the side member. To ensure the strength and stiffness of joints of these substantially T-shaped sections, each of these substantially T-shaped sections has an upper sheet, two curved vertical walls that connect with the upper sheet, and external flanges formed to connect with each of the two vertical walls.
    [0006] [006] The central column reinforcement must have the complicated shape described above, have a high strength, for example, of at least 400 MPa as a reinforcement member, and can also be produced at a low cost.
    [0007] [007] If the production of the central column reinforcement through formation by pressing a smooth sheet of metal is experienced, a problem occurs in which wrinkles and cracks are likely to occur in the top sheet and in the flanges at the top end and at the bottom end of the substantially T-shaped sections. The resistance of the smooth mold is the highest, this problem is the most striking.
    [0008] [008] To prevent this problem from occurring, the central column reinforcement is typically produced through pressing and stretching training. To perform the press and stretch formation, the metal mold for the central column reinforcement must have a very high extensibility. Therefore, as a metal mold for the central column reinforcement, only a material that has a relatively low strength (for example, a steel sheet that has a tensile strength of about 340 MPa) can be used. In order to ensure the required high strength, it is necessary to use a thick and heavy mold. Therefore, the weight of the car body wrap increases, and the cost of production increases.
    [0009] [009] In addition, in order to produce the central column reinforcement by pressing and stretching formation, the mold needs to have a wide margin thickness (cutting part) because the outer peripheral parts of the mold are strongly restricted by a mold holder. In this way, the production costs of the central column reinforcement increase even more.
    [0010] [0010] In addition, some reinforcements of the central column cannot be molded monolithically due to their shape and strength. These center column reinforcements need to be formed by joining a plurality of components that are formed by pressing separately. For this reason also, the production costs of the central column reinforcement increase.
    [0011] [0011] Patent Documents 1 to 4 disclose inventions for the manufacture of products formed by pressing, each of which has a simple cross-sectional shape such as a simple hat shape or a Z shape that are produced by various types of flexion training. However, Patent Documents 1 to 4 do not disclose a method for producing central column reinforcement that has a high strength and a complicated shape as described above at a low cost. Related Technique Documents Patent Document
    [0012] [0012] Patent Document 1: Japanese Patent Open to Public Inspection No. 2003-103306
    [0013] [0013] Patent Document 2: Japanese Patent Open to Public Inspection No. 2004-154859
    [0014] [0014] Patent Document 3: Japanese Patent Open to Public Inspection No. 2006-015404
    [0015] [0015] Patent Document 4: Japanese Patent Open to Public Inspection No. 2008-307557 Description of the Invention Problems to be solved by the invention
    [0016] [0016] An object of the present invention is to provide a method for forming by pressing a mold, for example, not only a mold consisting of a steel sheet that has excellent ductility and relatively low strength, but also a mold consisting of a sheet of high tensile strength steel (tensile strength: 400 MPa or more) that has low ductility, whereby the central column reinforcement described above can be produced at low cost without generating of wrinkles and cracks in the sheet and in the upper flanges at the top end and bottom end of the substantially T-shaped sections. Solution to the Problem
    [0017] [0017] The present invention provides a method for producing a central column reinforcement by pressing a metal mold, wherein the central column reinforcement comprises a body that is long and partially curved substantially in shape. arc and two substantially T-shaped sections formed on both end parts in the longitudinal direction of the body, and thus a panel is formed that has a substantially I-shape in a plan view, in which the body having a substantially hat-shaped cross section formed by a long curved top sheet, two vertical walls that connect with both parts of the edge in the direction of the width of the top sheet, and two external flanges that connect with the two respective vertical walls, where each of the substantially T-shaped sections has a top sheet, and two curved vertical walls that connect with the top sheet; and the two curved vertical walls of at least one of the two substantially T-shaped sections, each of which has a height which gradually decreases in a direction of the body to the substantially T-shaped section, wherein, preferably, the mold has an outer shape that has parts formed in the respective substantially T-shaped two sections, and the parts are formed as a curved protuberance, and the central column reinforcement is produced by performing a first step to produce a first intermediate formed product by forming by pressing the mold when using a first pressing forming device for drawing, wherein the device comprises a die, a mold holder for holding the mold together with the die, and a punch to press the mold into the die, wherein the first intermediate formed product has a body section and parts that are formed as two substantially T-shaped sections, where section d the body is formed by some parts of the top sheet and each of the two vertical walls in the body and a part of the top sheet and each of the two vertical walls in a substantially T-shaped section of the two substantially T-shaped sections, and the parts that are formed in the two substantially T-shaped sections excluding some parts of the top sheet and each of the two vertical walls in a substantially T-shaped section, and a second step for this, when using a second forming device by pressing for flexion forming, wherein the device comprises a punch; a cushion that has a coupling surface that faces the protrusion of the puncher, and dies to press the intermediate formed product into the puncher, pressing the first intermediate formed product in a state where at least a part of each part formed in the two substantially T-shaped sections of the intermediate formed product is secured by the cushion and the punch.
    [0018] [0018] In the present invention, the term "cold" means an atmosphere at room temperature, and the term "hot" means an atmosphere higher than cold and lower than the point Ac3, preferably no higher than the point Ac1.
    [0019] [0019] In the present invention, in the case where the highest position in a region in the longitudinal direction where the body section is formed is defined as a position of the longitudinal direction of 0%, where the value of the% of the longitudinal direction is defined to be increased with the decrease in the longitudinal direction, and the lowest position in the body section in the longitudinal direction is defined as a position of the 100% longitudinal direction, the height of the vertical walls in the body section formed in the first product intermediate formed by the first stage is preferably at most 20% of the height of the vertical walls of the central column reinforcement in the position of the 0% longitudinal direction; at least 60% of the height of the vertical walls of the central column reinforcement in the positions of the 20 to 60% longitudinal direction, and a maximum of 20% of the height of the vertical walls of the central column reinforcement in the position of the 100% longitudinal direction.
    [0020] [0020] The present invention illustrates that the matrix of the first press forming device has a recessed recess in an arc shape that corresponds to the shapes of some parts of the top sheet and each of the two vertical walls of the first intermediate formed product, and the die face surfaces that correspond to the shapes of the top sheet and each of the two vertical walls in a substantially T-shaped section of the first intermediate formed product, the mold holder of the first press forming device has retaining surfaces to hold the mold together with the die face surfaces of the die, and the punch of the first press forming device presses the mold into the die recess.
    [0021] [0021] The present invention illustrates that the punch of the second press forming device has a protrusion that has a shape that corresponds to the body of the central column reinforcement, and the cushion of the second press forming device has a coupling surface that it faces the protrusion of the punch, and holds at least one of the parts formed on the upper sheets of the two substantially T-shaped sections of the first intermediate formed product.
    [0022] [0022] In the present invention, it is preferable that the difference in length in the longitudinal direction between the flange surface of a curved part in a part consisting of some part of the central column reinforcement body and the flange surface of the reinforcement body central column is at most 0.8% of the length in the longitudinal direction of the flange surface of the
    [0023] [0023] In the present invention, the cushion and the punch of the second press forming device can secure the arm sections that project in the transverse direction of the parts formed in the two substantially T-shaped sections of the first intermediate formed product, or hold the entire product formed intermediate.
    [0024] [0024] In the present invention, the mold preferably consists of a sheet of high tensile strength steel that has a tensile strength of 400 to 1600 MPa, and the lower limit of the tensile strength of the mold is preferably 590 MPa , more preferably 780 MPa, and even more preferably 980 MPa.
    [0025] [0025] Furthermore, in the present invention, the mold is preferably an adapted mold obtained by welding a plurality of materials that have different tensile strengths. Effects of the Invention
    [0026] [0026] In the present invention, the central column reinforcement is produced by performing the first step to produce the first intermediate formed product by subjecting the mold to the shallow stretch when using the first pressing forming device, and the second step for bend the first intermediate formed product when using the second press forming device. Therefore, according to the present invention, even if the mold, for example, not only the mold consisting of a sheet of steel that has excellent ductility and relatively low strength, but also the mold that consists of a sheet of steel high tensile strength (tensile strength: 400 MPa or more) that has a low ductility is formed with pressing, the central column reinforcement can be produced reliably at a low cost without the generation of wrinkles and cracks in the top sheet and on the flange in the upper end section and in the lower end section of the substantially T-shaped section. Brief Description of Drawings
    [0027] [0027] Figure 1 is a perspective view showing an example of a central column reinforcement produced by the method of the present invention.
    [0028] [0028] Figure 2 is a section of a central column reinforcement along line II-II in Figure 1.
    [0029] [0029] Figure 3 is a perspective view showing an example of a mold.
    [0030] [0030] Figure 4 is a perspective view showing a first pressing forming device to perform the formation with shallow stretching, showing in particular the recess of a die, the retaining surfaces of a mold support, and the protrusion of a punch, along with a mold.
    [0031] [0031] Figure 5 is a section showing a first press forming device at the time of beginning of the shallow stretch.
    [0032] [0032] Figure 6 is a perspective view showing an example of a first formed intermediate product that is produced by shallow stretching of a mold when using a first device, Figure 6 (a) is an anterior view, Figure 6 (b) is a side view, and Figure 6 (c) shows sections A to D in Figure 6 (b).
    [0033] [0033] Figure 7 is a perspective view showing a second pressing forming device, in particular showing the top surface and the protrusion of a punch (the punch forming surface), the matrix forming surfaces, and the coupling surface of a cushion, together with a first formed intermediate product.
    [0034] [0034] Figure 8 is a section of a second press forming device at the start of the fold.
    [0035] [0035] Figure 9 is a section of a second press forming device during bending.
    [0036] [0036] Figure 10 is a perspective view showing an example of a central column reinforcement or a second intermediate formed product that is produced by bending a first intermediate formed product when using a second press forming device.
    [0037] [0037] Figure 11 is a side view of a part formed in the body section of a first intermediate formed product.
    [0038] [0038] Figure 12 is a graph showing a result of the simulation, showing an influence of a reduction ratio (%) and a depth H (mm) exerted in the presence of wrinkles in a part formed on the outer flange of the column reinforcement central in a first formed intermediate product.
    [0039] [0039] Figure 13 is a perspective view showing an example of a central column reinforcement produced by the method according to the present invention. Description of Modalities
    [0040] [0040] The present invention will now be described with reference to the accompanying drawings.
    [0041] [0041] Figure 1 is a perspective view showing an example of a central column reinforcement 10 produced by the method of the present invention, and Figure 2 is a section of the central column reinforcement 10 along line II-II in Figure 1.
    [0042] [0042] As shown in Figures 1 and 2, the central column reinforcement 10 is a formed panel having a body 16 and the sections substantially T-shaped 12 and 14. In the following explanation, the section substantially shaped T 12 is indicated as a substantially upper T-shaped section 12, and the substantially T-shaped section 14 is indicated as a substantially lower T-shaped section 14.
    [0043] [0043] The body 16 has an external shape that is long and is partially curved substantially in a curve shape. In addition, the substantially upper T-shaped section 12 and the substantially lower T-shaped section 14 are formed at both end parts in the longitudinal direction of the body 16 so that their width expands in the direction away from the body 16. Since the central column reinforcement 10 comprises the substantially upper T-shaped section 12, the body 16 and the substantially lower T-shaped section 14 from top to bottom, the central column reinforcement 10 has an external shape substantially I-shaped in a plan view.
    [0044] [0044] In particular, as shown in Figure 2, the body 16 has a substantially hat-shaped cross section formed by an upper sheet 18, two vertical walls 20 and 22 that connect with the edge parts 18a and 18b in the direction the width (the direction from right to left in Figure 2) of the top sheet 18, and two outer flanges 24 and 26 that connect with the two respective vertical walls 20 and 22.
    [0045] [0045] The body 16 incorporates several components (for example, a front door lock mechanism, a rear door hinge, or a seat belt extraction mechanism) in the same. In addition, the two vertical walls 20 and 22 function as sealing surfaces for the weather sealing strips installed on a front door and a rear door.
    [0046] [0046] On the other hand, both the substantially upper T-shaped section 12 and the substantially lower T-shaped section 14 have the upper leaf 18 and the two curved vertical walls 20 and 22 that connect with the upper leaf 18. In the substantially upper T-shaped section 12 and in substantially lower T-shaped section 14, the width of the upper sheet 18 is gradually expanded, and the two vertical walls 20 and 22 are curved. The height of each of the two vertical walls 20 and 22 in the substantially upper T-shaped section 12 gradually decreases in a direction directed from the body 16 to the upper end part of the substantially upper T-shaped section 12.
    [0047] [0047] The central column reinforcement 10 is one of the components that form a central column that is arranged between a side stringer (indentation) that forms the side of the body in a car body wrap and a roof rail, and it is arranged as a reinforcement member between an external panel of the central column and an internal panel of the central column. In Figure 1, only the central column reinforcement 10 is shown, and other components are omitted.
    [0048] [0048] The substantially upper T-shaped section 12 of the central column reinforcement 10 is tightly joined, for example, by spot welding to a reinforcement of the side roof rail (not shown) that forms the side of the roof. body, and the substantially lower T-shaped section 14 is tightly joined, for example, by spot welding to a reinforcement of the side member (not shown) that forms the side of the body.
    [0049] [0049] In the present invention, the central column reinforcement 10 is produced by performing the first and second steps to press-form a metal mold in the order. Therefore, the first and second steps are explained successively. First step
    [0050] [0050] Figure 3 is a perspective view showing an example of a mold 30.
    [0051] [0051] As shown in Figure 3, the mold 30 of the central column reinforcement 10 has an upper end section 32 substantially formed as a substantially T-shaped section 12 of the central column reinforcement 10, a lower end section 34 formed as a substantially lower T-shaped section 14, and a body section 36 which is disposed between the upper end section 32 and the lower end section 34 and is formed substantially as body 16 of the central column reinforcement 10.
    [0052] [0052] In addition, to prevent the edge from cracking after formation, the parts 32a and 34a which are edges of the end of the upper end section 32 and of the lower end section 34, respectively, each of them is preferably shaped as a curved lump.
    [0053] [0053] The mold 30 is preferably worked in advance to have an external shape in an appropriate way when taking into account the final shape. In addition, the mold 30 can be a sheet of metal of a single material, or an adapted mold obtained by welding a plurality of materials that have different tensile strengths. In addition, mold 30 preferably consists of a sheet of high tensile strength steel that has a tensile strength of 400 to 1600 MPa. In this way, it is possible to increase the resistance and reduce the weight of the central column reinforcement 10.
    [0054] [0054] Figure 4 is a perspective view showing a first press forming device 40 for performing shallow stretch forming, showing in particular a recess 42a of a die 42, the retaining surfaces 44a of a support mold 44, and a protrusion 46a of a punch 46, together with a mold 30. Figure 5 is a section showing the first press forming device 40 at the beginning of the shallow stretch.
    [0055] [0055] As shown in Figures 4 and 5, in the present invention, to produce the central column reinforcement 10, the first press forming device 40 is used to perform the stretch press (shallow) formation.
    [0056] [0056] The first press forming device 40 included die 42, mold holder 44 arranged to face die 42, and punch 46.
    [0057] [0057] As shown in Figures 4 and 5, the matrix 42 has a shape that can obtain the formation of a body section 56 of a first formed intermediate product 50, described below, that is, it has the recess 42a that has a substantially arc-shaped lower undercarriage, and the matrix face surfaces 42b, each of which consists of a curved surface extending along the peripheral edge portion of the undercut 42a.
    [0058] [0058] Each of the matrix face surfaces 42b has a shape such that any one within the height of the vertical wall of a substantially upper T-shaped section 52 extending to the outside of the body section 56 of the first product intermediate formed 50 and the height of the vertical wall of a substantially lower T-shaped section 54 extending outside the body section 56 of the first intermediate formed product 50 gradually decreases in a direction from the body section 56 to the substantially section in the upper T shape 52 and the substantially lower T shape section 54, respectively.
    [0059] [0059] The mold holder 44 has the retaining surfaces 44a facing the matrix face surfaces 42b of the matrix 42. Each of the retaining surfaces 44a is formed as a curved surface that slightly warps to the matrix face surface. 42b confronting.
    [0060] [0060] In addition, the punch 46 has a protrusion 46a that is curved in an arc shape that corresponds to the recess 42a of the matrix 42.
    [0061] [0061] As shown in Figure 5, the mold 30, which is a smooth sheet metal, is disposed between the die 42 and the mold holder 44. Then, the mold 30 is attached along the peripheral part of the edge of the die 42a of the die 42 by the die face surfaces 42b of the die 42 and by the retaining surfaces 44a of the mold holder 44. Then, the first intermediate formed product 50 is produced by pressing the protrusion 46a of the punch 46 into the recess 42a of the die. matrix 42.
    [0062] [0062] Figure 6 is a perspective view showing an example of the first intermediate formed product 50 that is produced by the shallow stretching of the mold 30 when using the first press forming device 40, Figure 6 (a) is a previous view, Figure 6 (b) is a side view, and Figure 6 (c) shows sections A to D in Figure 6 (b).
    [0063] [0063] As shown in Figure 6, the first intermediate formed product 50 has the body section 56 bending in an arc shape, the substantially upper T-shape section 52 that connects with the upper part of the body section 56 and extends to the outside of the body section 56, and the substantially T-shaped section 54 that connects to the bottom of the body section 56 and extends to the outside of the body section 56.
    [0064] [0064] The substantially upper T-shaped section 52 has arm sections 52a and 52b that are formed so as to project in opposite directions from each other in the transverse direction of the first intermediate formed product 50 (the direction that substantially intersects at angles with the direction in which the body section 56 extends). In addition, the substantially lower T-shaped section 54 has arm sections 54a and 54b that are formed to project in opposite directions from each other in the transverse direction of the first intermediate formed product 50 (the direction that substantially intersects at angles with the direction in which the body section 56 extends).
    [0065] [0065] The body section 56 has an upper sheet 51, and the vertical walls 53 and 55 that extend along the edge sections 51a and 51b, respectively, of the upper sheet 51. The vertical walls 53 and 55 are formed if extending substantially in parallel with the topsheet 51 and connecting with the outer flanges 57 and 59, respectively, which are formed on the outer flanges 24 and 26, respectively, of the central column reinforcement 10.
    [0066] [0066] The body section 56 of the first intermediate formed product 50 forms a body part 16 of the complete central column reinforcement 10. Comparing to the substantially upper T-shaped section 12 and the substantially lower T-shaped section 14 of the complete central column reinforcement 10, both the substantially upper T-shaped section 52 and the substantially lower T-shaped section 54 of the first intermediate formed product 50 has shapes such that the shape is uniform and undefined, and in addition the heights of the vertical walls 53 and 55 are smaller than the heights of the vertical walls 20 and 22. In this way, the mold 30 is subjected to formation with shallow stretching using the first press forming device 40.
    [0067] [0067] The first intermediate formed product 50 has (i) some parts of the top sheet 18 and each of the two vertical walls 20 and 22 of the body 16 of the central column reinforcement 10, (ii) the body section 56 that forms some parts of the upper sheet 18 and each of the two vertical walls 20 and 22 of the substantially lower T-shaped section 14 of the substantially upper T-shaped section 12 and the substantially lower T-shaped section 14, and (iii) the parts which are formed in the substantially upper T-shaped section 12 and in the substantially lower T-shaped section 14 excluding some parts of the upper sheet 18 and each of the two vertical walls 20 and 22 of the substantially lower T-shaped section 14.
    [0068] [0068] As shown in Figure 6 (a), the highest position in a region A in which the body section 56 of the first intermediate formed product 50 is formed is defined as a position of the 0% longitudinal direction, where the% of the longitudinal direction value is set to increase with the decrease in the longitudinal direction, and the lowest position in the body section in the longitudinal direction is defined as a position of the 100% longitudinal direction. In this case, the height of the vertical walls 53 and 55 of the body section 56 is (i) at most 20% of the height of the vertical walls 20 and 22 of the central column reinforcement 10 in the position of the 0% longitudinal direction, (ii) at least 60% of the height of the vertical walls 20 and 22 of the central column reinforcement 10 in the positions of the longitudinal direction of 20 to 60%, and (iii) a maximum of 20% of the height of the vertical walls 20 and 22 of the central column reinforcement 10 in the 100% longitudinal direction position.
    [0069] [0069] For example, the heights of the vertical walls 53 and 55 in the cross sections A to D of the body section 56 shown in Figures 6 (b) and 6 (c) are 0 mm, 25.0 mm, 35.0 mm and 5.8 mm, respectively, and the heights of the vertical walls 20 and 22 in the cross sections A to D of the central column reinforcement 10 are 26.6 mm, 25.0 mm, 41.5 mm and 62.4 mm, respectively. Therefore, the ratios between the heights of the vertical walls 53 and 55 in the cross sections A to D of the body section 56 and the heights of the vertical walls 20 and 22 of the central column reinforcement 10 are 0%, 100.0%, 84 , 3% and 9.3%, respectively. Second stage
    [0070] [0070] Figure 7 is a perspective view showing a second press forming device 60, in particular showing an upper surface 61a and a protrusion 61 of a punch 62 (the punch forming surface 62), the pressing surfaces forming 66a of dies 66, and to a coupling surface 64a of a cushion 64, together with the first intermediate formed product 50. Figure 8 is a section of the second press forming device 60 at the time of the start of the fold, and the Figure 9 is a section of the second press forming device 60 during bending.
    [0071] [0071] In the present invention, to further subject the first formed forming product 50 to bending by pressing, the second pressing forming device 60 is used.
    [0072] [0072] As shown in Figures 7 to 9, the second press forming device 60 has the punch 62 with an external shape that can form the shape of the central column reinforcement described above, the cushion 64 for holding the intermediate formed product 50 together with the punch 62, and the bending dies 66 for pressing the intermediate formed product 50 into the punch 62 along with the cushion 64.
    [0073] [0073] As shown in Figures 7 to 9, the punch 62 has the body forming part 61 which has a shape that can form the body 16 of the central column reinforcement 10, an upper end forming part 63 and a lower end forming part 65 disposed on both end parts of body forming part 61 and can form the shapes of the substantially upper T-shaped section 12 and the substantially lower T-shaped section 14, respectively, of the reinforcement central column 10, and the flange forming parts 67 and 69 that form the forming surfaces that can provide the formation of the external flange shapes 24 and 26, respectively, of the central column reinforcement 10.
    [0074] [0074] The body forming part 61 has an upper surface 61a that has a shape that can obtain the shape of the upper leaf shape 12 of the central column reinforcement 10, and the side surfaces 61b and 61c that have shapes that can provide the formation of vertical wall shapes 20 and 22, respectively, of the central column reinforcement 10.
    [0075] [0075] The upper end forming part 63 and the lower end forming part 65 also have the upper surfaces 63a and 65a and the side surfaces 63b and 65b, respectively, which correspond to the shapes of the section substantially in an upper T shape. 12 and the substantially lower T-shaped section 14, respectively, of the central column reinforcement 10.
    [0076] [0076] Cushion 64 is a component for pressing formation and retention of the first intermediate formed product 50 in the punch 62 during folding of the first intermediate formed product 50. The cushion 64 has the central coupling surface 64a which faces the upper surface 61a of the body forming part 61 of the punch 62 and can form the upper sheet 16 of the central column reinforcement 10, and the upper coupling surface 64b and the lower coupling surface 64c have shapes that face the surfaces upper 63a and 65a of the upper end forming part 63 and the lower end forming part 65, respectively, of the punch 62 and can form the substantially upper T-shaped section 12 and the substantially lower T-shaped section 14, respectively, of the central column reinforcement 10.
    [0077] [0077] Each of the dies 66 has the flange forming surface 66a which faces each of the forming surfaces of the flange forming parts 67 and 69 of the punch 62 and can form each of the flange sections 24 and 26 of the central column reinforcement 10, and a side surface 66b having a shape that can provide the formation of each of the lateral surfaces 20 and 22 of the body section 16 of the central column reinforcement 10 and each of the vertical walls of the section substantially in upper T shape 12 and the section substantially lower T shape 14.
    [0078] [0078] As shown in Figure 8, the first intermediate formed product 50 is disposed between the cushion 64 and the dies 66 and the punch 62 so that the body section 56 of the first intermediate formed product 50 is disposed between the body forming part 61 of the punch 62 and the cushion 64.
    [0079] [0079] Next, as shown in Figure 9, the pad 64 is directed towards the punch 62, and the first intermediate formed product 50 is stuck between the pad 64 and the punch 62. When directing the dies 66 to the punch 62 , the first intermediate formed product 50 is pressed into the punch 62 by the dies 66 and folded in a state of being trapped between the pad 64 and the punch 62. In this way, the central column reinforcement 10 is produced.
    [0080] [0080] The first intermediate formed product 50 has only to be stuck between the cushion 64 and the punch 62 in the state of the beginning of the fold when using the dies 66, and in this way the cushion 64 and dies 66 can be directed similarly to the puncture 62. Post-process
    [0081] [0081] Figure 10 is a perspective view showing an example of the central column reinforcement 10 or a second intermediate formed product 70 that is produced by bending the first intermediate formed product 50 when using the second press forming device 60.
    [0082] [0082] Depending on the conditions required for the central column reinforcement 10, the complete central column reinforcement 10 is produced by folding press when using the second press forming device 60. However, in the case where the reinforcement of central column 10 obtained in this way is still post-processed, the formed product obtained by bending formation when using the second press forming device 60 is indicated as the second intermediate formed product 70 as shown in Figure 10, and the second formed product intermediate 70 is post-processed.
    [0083] [0083] For example, by still subjecting the second intermediate formed product 70 to a regulping process, a level difference (for example, a level difference 12a in the central column reinforcement 10 shown in Figure 1) can be formed particularly in an upper end section 72 of the second intermediate formed product 70.
    [0084] [0084] In this regulping process, the removal of an inevitable and slightly remaining distention in the second intermediate formed product 70 can be removed, or the impression of a predetermined shape such as convex-concave can be performed on an upper sheet 76a or on the walls verticals 76b and 76c of a body section 76 of the second intermediate formed product 70.
    [0085] [0085] For example, the regulping process is performed by using a press forming device for fold formation (not shown) provided with a matrix, a cushion and a puncture tool. In addition, in the regulping process, the peripheral edge sections 78 of the second intermediate formed product 70 can be cut or trimmed using a laser processing machine or a cutting machine.
    [0086] [0086] The second intermediate formed product 70 has the body section 76 which is fully curved in an arc shape in the longitudinal direction and has a hat-shaped cross section, a substantially T-72 upper end section which connects with the upper part of the body section 76 and is formed to extend towards the outside of the body section 76, and a substantially T-shaped end section 74 that connects with the lower part of the body section 76 and it is formed so as to extend towards the outside of the body section 76. The shapes of the body section 76, the upper end section 72 and the lower end section 74 of the second intermediate formed product 70 are more defined compared to those of the first intermediate formed product 50.
    [0087] [0087] In general, the length in the longitudinal direction of the upper sheet 76a of the body section 76 curved in an arc shape is at least 0.8% longer than the length in the longitudinal direction of the outer flanges 76d and 76e of the cross section. body 76.
    [0088] [0088] Figure 11 is a side view of a part formed in the body section 56 of the first intermediate formed product 50.
    [0089] [0089] Next, an appropriate condition is explained not to generate wrinkles in parts of the first intermediate formed product 50 that are formed on the outer flanges 24 and 26 of the central column reinforcement 10 when the first intermediate formed product 50 is stretched when using the first press forming device 40.
    [0090] [0090] As shown in Figure 11, the body section 56 of the first intermediate formed product 50 has a curved part 56a which is bulged outwards, and the straight parts 56b and 56c continue with both end parts in the longitudinal direction of the curved part 56a. Since the length in the longitudinal direction along the top sheet 51 of the curved part 56a in the body section 56 of the first intermediate formed product 50 (the length of the top surface of the sheet) is L1, the length in the longitudinal direction of a part that corresponds to the curved part 56a of the outer flanges 57 and 59 (the length in the longitudinal direction of an outer flange surface) L2 and the maximum value of the heights of the vertical walls 53 and 55, which are the distances between the top sheet 51 and the sections of external flanges 57 and 59, is H (the height of the curved part 56a), the value obtained by dividing the difference between the lengths L1 and L2 by L1, {(L1 - L2) / L1} x100, is defined as (% ) (reduction ratio). Since the curved part 56a has a shape that is bulged outwards, L1 is generally longer than L2.
    [0091] [0091] Figure 12 is a graph showing a result of the simulation, showing an influence of the reduction ratio (%) and the depth H (mm) exerted in the presence of wrinkles in a part formed on the outer flanges 24 and 26 of the reinforcement central column 10 in a first formed intermediate product 50.
    [0092] [0092] In this simulation, the mold of the first intermediate formed product 50 had a strength of 1180 MPa, and had a sheet thickness of 1.6 mm.
    [0093] [0093] As understood from the graph in Figure 12, in the case where the reduction ratio is a maximum of 0.8%, regardless of the height H of the curved part 56a, the wrinkles do not occur in the outer flange sections 57 and 59. On the other hand, if the reduction ratio is higher than 0.8%, wrinkles occur in the outer flange sections 57 and 59.
    [0094] [0094] In the present invention, the first intermediate formed product 50 is produced by means of shallow stretching when using the first press forming device 40 so that the reduction ratio is at most 0.8%, and then the central column reinforcement 10 or the second intermediate formed product 70 is produced by bending the first intermediate formed product 50 while it is secured or pressed by the cushion 64 when using the second press forming device 60. Therefore, in comparison with the method of conventional production in which the central column reinforcement 10 is produced only by the stretching of the mold 30, according to the present invention, the inlet flow of material from the end regions of the mold 30 mainly to the substantially upper T-shaped section 52 and the substantially lower T-shaped section 54 of the first intermediate formed product 50, i.e., the parts that are formed in the upper sheets 18 of the section substantially in the upper T shape 12 and the substantially lower T shape section 14 of the central column reinforcement 10 can be avoided or reduced, and the generation of wrinkles in these regions is thereby avoided.
    [0095] [0095] In addition, according to the present invention, by means of shallow stretching of the mold 30 so that the reduction ratio is at most 0.8% in the first stage, the material is taken to flow out of the regions of the mold 30 which are formed on the outer flanges 24 and 26 of the central column reinforcement 10. Therefore, in comparison with the production method in which the central column reinforcement 10 is produced only by bending the mold 30, the generation of wrinkles and cracks in the flange sections 24 and 26 of the central column reinforcement 10 are avoided.
    [0096] [0096] Figure 13 is a perspective view showing an example of the central column reinforcement 10 produced by the method according to the present invention, also showing the dimension of each part.
    [0097] [0097] By the production method according to the present invention, each of the central column reinforcements 10 that has the dimensions shown in Figure 11 was produced experimentally when using the molds 30 consisting of high tensile steel sheets that have tensile strengths of 590 MPa, 980 MPa and 1180 MPa.
    [0098] [0098] In addition, the central column reinforcement 10 was produced experimentally by the method according to the present invention. In this case, the mold 30 that had been obtained by welding a first sheet of high tensile strength steel that has a tensile strength of 1180 MPa and a second sheet of high tensile strength steel that has a tensile strength of 590 MPa beforehand, were used, and the parts formed in the upper end section 12 and in the body section 16 of the central column reinforcement 10 were formed by the first sheet of high tensile strength steel, and the part formed in the end section bottom 14 was formed by the second sheet of high tensile strength steel.
    [0099] [0099] As a result, it was confirmed that all products made experimentally could be worked satisfactorily without the generation of wrinkles and cracks.
    [0100] [00100] In the explanation above, a preferred embodiment of the present invention has been explained as an example. However, the present invention is not limited to this modality, and various changes, modifications and improvements can be made within the technical scope of the claims.
    [0101] [00101] For example, in the embodiment described above as an example, the entirety of the first intermediate formed product 50 was trapped between the cushion 64 and the punch 62. However, the present invention is not limited to that embodiment. In the conventional technique in which the central column reinforcement 10 is produced only by stretching, the wrinkles are generated due to the material inlet flow from the end regions of the mold 30 (the first intermediate formed product 50) mainly to the upper sheets of the section substantially in the upper T shape 12 and in the substantially lower T shape section 14 of the central column reinforcement 10. In the present invention, therefore, the central column reinforcement 10 can be formed satisfactorily even by folding the first intermediate formed product 50 even if some sections of the upper end section 52 and the lower end section 54 of the first intermediate formed product 50 only, in more detail, the arm sections 52a and 52b of the upper end section 52 and of the arm sections 54a and 54b of the lower end section 54 are only pressed by cushion 64. List of Reference Signs 10 central column reinforcement 12 substantially upper T-shaped section 14 substantially lower T-shaped section 16 body 30 mold 32 upper end section 34 lower end section 36 body section 40 first stretching press forming device 44 mold holder 46 punch 50 first formed intermediate product 52 substantially upper T-shaped section 54 substantially lower T-shaped section 56 body section 60 second press forming device for forming bending punch 62 punch 64 cushion 66 matrix 70 second intermediate formed product 72 upper end section 74 lower end section 76 body section
    权利要求:
    Claims (8)
    [0001]
    Method for producing a central column reinforcement (10) by pressing a metal mold (30), wherein the central column reinforcement (10) comprises a body (16) that is long and partially curved substantially in an arc shape and two substantially T-shaped sections (12, 14) formed on both end parts in the longitudinal direction of the body (16), and thus a panel having a substantially I-shape in a view of plant is formed, in which the body (16) has a substantially hat-shaped cross section formed by a long curved top sheet (18), two vertical walls (20, 22) that connect to both edge parts ( 18a, 18b) in the direction of the width of the top sheet (18), and two external flanges (24, 26) that connect to the respective two vertical walls (20, 22), where each of the two substantially T-shaped sections (12, 14) each has an upper sheet (18), and two vertical walls (20, 2 2) curved that connect to the top sheet (18), and the two curved vertical walls (20, 22) of at least one of the two substantially T-shaped sections (12, 14) each have a height that gradually decreases to a direction directed from the body (16) to the substantially T-shaped section (12, 14), characterized by the fact that the central column reinforcement (10) is produced by executing a first step for producing a first intermediate formed product by means of pressing forming of the mold (30) by using a first pressing forming device (40) for drawing, wherein the device comprises a matrix (42), a support of mold (44) for holding the mold (30) together with the die (42), and a punch (46) for pressing the mold (30) on the die (42), in which the first intermediate formed product (50) has a body section (56) and parts that are formed in the two substantially T-shaped sections (52, 54), where the body section (56) is formed by some parts of the top sheet and each of the two vertical walls in the body, and a part of the top sheet and each of the two vertical walls in a substantially T-shaped section of the two substantially T-shaped sections (52, 54), and the parts that are formed in the two substantially T-shaped sections T (52, 54) exclude some parts of the top sheet and each of the two vertical walls in a substantially T-shaped section, and a second step for, when using a second press forming device (60) for bending forming, the device comprising a punch (62), a pad (64) having a coupling surface (64a) facing the protrusion (61) of the punch (62), and a die (66) for pressing the first intermediate formed product (50) into the punch (62), pressing the first intermediate formed product (50) in a state in which at least part of each of the parts formed in the two substantially T-shaped sections of the intermediate formed product (50) is secured by the pad (64) and the punch (62) where, in the case where the highest position in a region in the longitudinal direction where the body section (56) is formed is defined as a position of the longitudinal direction of 0%, the value of the% of the longitudinal direction is defined so to be increased with the decrease in the longitudinal direction, and the lowest position in the region in the longitudinal direction is defined as a position of the 100% longitudinal direction, where the height of the vertical walls in the body section (56) formed in the first product intermediate formation (50) by the first stage is at most 20% of the height of the vertical walls (20, 22) of the central column reinforcement (10) in the position of the 0% longitudinal direction; at least 60% of the height of the vertical walls (20, 22) of the central column reinforcement (10) in the longitudinal direction positions of 20 to 60%, and a maximum of 20% of the height of the vertical walls (20, 22) of the reinforcement central column (10) in the 100% longitudinal direction position.
    [0002]
    Method for producing a central column reinforcement (10) according to claim 1, characterized by the fact that the die (42) of the first press forming device (40) has a recess (42a) recessed in an arc shape that corresponds to the shapes of some parts of the top sheet and each of the two vertical walls (20, 22) of the first intermediate formed product (50), and the matrix face surfaces (42b) corresponding to the shapes of the top sheet and each of the two vertical walls (20, 22) in a substantially T-shaped section of the first intermediate formed product (50), the mold holder (44) of the first press forming device (40) has retaining surfaces (44a) to hold the mold together with the die face surfaces (42b) of the die (42), and the punch (46 ) of the first press forming device (40) pushes the mold into the recess (42a) of the die (42).
    [0003]
    Method for producing a central column reinforcement (10) according to claim 1 or 2, characterized by the fact that the punch (62) of the second press forming device (60) has a protuberance that has a shape that corresponds to the body (16) of the central column reinforcement (10), and the cushion (64) of the second forming device by The press (60) has a coupling surface (64a) that faces the protrusion of the punch (62), and holds at least one of the parts formed in the upper sheets of the two substantially T-shaped sections (12, 14) of the first intermediate formed product (50).
    [0004]
    Method for producing a central column reinforcement (10) according to any one of claims 1 to 3, characterized in that the difference in length in the longitudinal direction between the flange surface of a curved part in a part consisting of somewhere in the body (16) of the central column reinforcement (10) and the flange surface of the body (16) of the central column reinforcement (10) is at most 0.8% of the length in the longitudinal direction of the flange surface of the curved part.
    [0005]
    Method for producing a central column reinforcement (10) according to any one of claims 1 to 4, characterized in that the cushion (64) and the punch (62) of the second press forming device (60) it secures the arm sections that project in the transverse direction in each of the parts formed in the two substantially T-shaped sections (12, 14) of the first intermediate formed product (50).
    [0006]
    Method for producing a central column reinforcement (10) according to any one of claims 1 to 4, characterized in that the cushion (64) and the punch (62) of the second press forming device (60) they hold the whole of the first intermediate formed product (50).
    [0007]
    Method for producing a central column reinforcement (10) according to any one of claims 1 to 6, characterized in that the mold (30) consists of a sheet of high tensile strength steel that has a resistance to 400 to 1600 MPa traction.
    [0008]
    Method for producing a central column reinforcement (10) according to any one of claims 1 to 7, characterized in that the mold (30) is an adapted mold obtained by welding a plurality of materials that have different resistance to traction.
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    同族专利:
    公开号 | 公开日
    CN104684661B|2017-06-09|
    ES2757874T3|2020-04-30|
    JP5614514B2|2014-10-29|
    ZA201501866B|2016-01-27|
    CA2885406C|2017-06-13|
    JPWO2014050973A1|2016-08-22|
    CA2885406A1|2014-04-03|
    EP2902128A4|2016-06-08|
    US20150273563A1|2015-10-01|
    MX2015004079A|2015-10-22|
    IN2015DN02458A|2015-09-04|
    KR101702795B1|2017-02-03|
    MY172070A|2019-11-13|
    US9839954B2|2017-12-12|
    CN104684661A|2015-06-03|
    EP2902128B1|2019-09-25|
    EP2902128A1|2015-08-05|
    WO2014050973A1|2014-04-03|
    RU2015115725A|2016-11-20|
    BR112015006456A2|2017-07-04|
    KR20150058415A|2015-05-28|
    TWI556885B|2016-11-11|
    RU2628268C2|2017-08-15|
    TW201422332A|2014-06-16|
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    法律状态:
    2018-11-21| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-09-03| B25D| Requested change of name of applicant approved|Owner name: NIPPON STEEL CORPORATION (JP) |
    2019-11-19| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-06-23| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-08-25| 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 26/09/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    2021-08-10| B21F| Lapse acc. art. 78, item iv - on non-payment of the annual fees in time|Free format text: REFERENTE A 8A ANUIDADE. |
    2021-11-30| B24J| Lapse because of non-payment of annual fees (definitively: art 78 iv lpi, resolution 113/2013 art. 12)|Free format text: EM VIRTUDE DA EXTINCAO PUBLICADA NA RPI 2640 DE 10-08-2021 E CONSIDERANDO AUSENCIA DE MANIFESTACAO DENTRO DOS PRAZOS LEGAIS, INFORMO QUE CABE SER MANTIDA A EXTINCAO DA PATENTE E SEUS CERTIFICADOS, CONFORME O DISPOSTO NO ARTIGO 12, DA RESOLUCAO 113/2013. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2012-214295|2012-09-27|
    JP2012214295|2012-09-27|
    PCT/JP2013/076076|WO2014050973A1|2012-09-27|2013-09-26|Production method for centre-pillar reinforcement|
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