• 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:
    "manufacturing method for a press component and device for manufacturing the same. the present invention relates to a manufacturing technique, using a metal plate that has a tensile strength of 500 mpa to 1,800 mpa as a raw material, from a press component that has a cross-section in the shape of a hat and that is curved into a l shape in the longitudinal direction, without causing creasing or cracking and a high yield. the top of the metal material is pressed against a hole punch (72) and secured by a pad (74); the portion that runs along the outside of the l-shaped curve is pressed against a matrix (71) and secured by a fastener disc (73); a bending tool (75) is moved; a vertical wall portion on the inside of the l-shaped curve of the raw material metal plate and a flange part that connects to the vertical wall on the inside of the l-shaped curve they are shaped, the raw material metal is moved in the direction in which the disc holder (73) is positioned while the state in which the raw material metal plate is pressed against the die (71) and held by the disc holder (73) is maintained; and a vertical wall portion on the outside of the l-shaped curve of the d and l hat-shaped cross section and a flange portion that connects to the vertical wall on the outside of the l-shaped curve are shaped.
    公开号:BR112015015963B1
    申请号:R112015015963-0
    申请日:2013-12-20
    公开日:2020-09-01
    发明作者:Takashi Miyagi；Yasuharu Tanaka；Misao Ogawa；Toshimitsu Aso；Kazuyuki Kawano；Kazunori Oooka；Shinobu Yamamoto
    申请人:Nippon Steel Corporation；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [001] The present invention relates to a press component which has a cross-section in the shape of a hat and which is curved in an L shape along the longitudinal direction in plan view and a manufacturing method and manufacturing device for the same. BACKGROUND TECHNIQUE
    [002] Automobile vehicle body frame structures are configured from several frame members obtained by molding the metal blade by pressing (steel blade is taken as an example of metal raw material blade in the explanation that follows). Such frame components are very important components to ensure collision safety in automobiles. Known examples of frame members include struts, cross members and front columns.
    [003] Such frame members have hat-shaped cross sections configured from a top plate section, two vertical walls connected to both sides of the top plate section and two flange portions connected to two respective vertical walls . The majority of such frame members have a hat-shaped cross-section over a portion or all of it. High strength is desired in such frame members in order to improve collision safety performance and to achieve weight reduction in vehicles.
    [004] Figure 19 is a perspective view of an example of a frame member 0 which has a cross-section in the shape of a hat and which has a straight shape along the longitudinal direction in plan view and in side view. Figure 20 is an explanatory diagram of a front column 0-1 which is an example of a frame member that has a hat-shaped cross section. Figure 20A is a perspective view and Figure 20B is a plan view. Figure 21 is a perspective view illustrating a component 1 which has a hat-shaped cross-section and which is curved in an L shape along the longitudinal direction in plan view. In this report, "plan view" refers to the visualization of column 0-1 from an orthogonal direction to the top plate section which is the widest flat portion in the limb (the direction of the white arrow in Figure 20A and the orthogonal direction to the page in Figure 20B).
    [005] Frame member 0 is a stringer or similar frame member that has a hat-shaped cross-section and has a shape that is substantially straight in the longitudinal direction as illustrated in the example in Figure 19. In contrast to the same, the front column 0-1 has a shape as illustrated in Figure 20A and Figure 20B. Namely, the front column 0-1 has a hat-shaped cross-section and includes a curved L-shaped shape along the longitudinal direction in flat view as shown in Figure 21, on the side of a lower portion 0-2 front column 0-1.
    [006] Of such components, the frame member 0 is manufactured mainly by bending due to having a substantially straight shape along the longitudinal direction. Because the peripheral cross-sectional length of the frame member 0 does not change much along the length direction, cracks and creases are not generated immediately during press processing even when formed from high strength steel sheet which has low extensibility and molding It's simple.
    [007] For example, Patent Document 1 describes a method that forms a press component that has a hat-shaped cross-section per fold. The method described in Patent Document 1 manufactures press components that have a hat-shaped cross-section and that are substantially straight in shape along the longitudinal direction.
    [008] Figure 22 is a perspective view illustrating a press component 1 manufactured by bending that has a cross section in the shape of a hat and that has a curved shape in an L shape along the longitudinal direction.
    [009] When component 1 illustrated in Figure 21 which has a cross-section in the shape of a hat and which is curved in an L shape along the longitudinal direction folding using the method described in Patent Document 1, creases they are generated in the flange portion (portion A) on the outside of a curved portion 1A as illustrated in Figure 22. Therefore, component 1 is generally molded by drawing in press processing. In stretching, a steel raw material blade is molded using a die, a hole punch and a disc clamp to control the amount of inflow of the metal raw material blade and to suppress the generation of creases .
    [0010] Figure 23 is an explanatory diagram that illustrates a component 2 to be molded that is curved in an L shape along the longitudinal direction. Figure 23A is a perspective view and Figure 23B is a plan view. Figure 24 is a plan view showing the shape of a sheet of steel raw material 3 in stretch and a region of inhibition of creases B on a steel raw material blade 3. Figure 25A to Figure 25D are sections cross-sections that illustrate a mold structure and a stretch drawing procedure. Figure 26 is a perspective view of a drawn panel 5 that has been shaped by drawing.
    [0011] For example, molding employs a die 41, a hole punch 42 and a disc fastener 43 as shown in Figure 25A to Figure 25D, in order to shape a component 2 that is curved into an L shape along the longitudinal direction in side view, illustrated in Figure 23, by stretching.
    [0012] First, as shown in Figure 25A, the steel raw material blade 3 shown in Figure 24 is positioned between punch 42 and disc holder 43 and die 41. Then, for example, as shown in Figure 25B, the crease inhibition region B of the periphery of the steel raw material blade 3 (the hatched shaded portion of Figure 24 is held tightly by the disc clamp 43 and the matrix 41. Then, as shown in Figure 25C , the matrix 41 is moved relatively in the direction of the punch 42. Then, finally, as shown in Figure 25D, the stretched panel 5 shown in Figure 26 is molded by processing the steel raw material blade 3 by pressing the blade of steel raw material 3 against punch 42 using matrix 41.
    [0013] In doing so, the crease inhibition region B on the periphery of the steel raw material blade 3 is held tightly by the disc clamp 43 and the matrix 41. Therefore, on the steel raw material blade 3 obtained by the molded procedure, the steel raw material blade 3 is stretched in a region on the inside of the crease inhibition region in a state under tensile load. It is therefore possible to shape, while suppressing creases. The unwanted portions on the periphery of the molded drawn panel 5 are then cut out to make the component 2 shown in Figure 23A and Figure 23B. RELATED DOCUMENTS RELATED PATENT DOCUMENTS
    [0014] Patent Document 1: Japanese Patent Application Open to Public Inspection (JP-A) No. 2006-015404 SUMMARY OF THE INVENTION TECHNICAL PROBLEM
    [0015] Conventionally, shapes like that of press component 1 are manufactured by press molding using stretch as described above, molding a sheet of steel raw material into a stretched panel 5 illustrated in Figure 26 and eliminating unwanted portions are made on the periphery of the panel drawn by trimming.
    [0016] In this method of stretching, a complicated shape can be molded, like that of component 2 which is curved in an L shape along the longitudinal direction in plan view. However, as shown in Figure 24, a large region to inhibit creases is required around the periphery of the steel raw material blade 3. Therefore, after the steel raw material blade 3 has been molded into the drawn panel, the unwanted portions eliminated by trimming are large portions, which decrease material yield and increase manufacturing cost.
    [0017] Furthermore, the vertical walls 22, 24 shown in Figure 23A are simultaneously molded in the procedure that molds the stretched panel 5. Thus, in the molding procedure, material influences on both sides of the top plate section 21 to mold the vertical walls 22, 24 as shown in Figure 25B to Figure 25D, without the steel raw material blade 3 moving significantly in the portion forming a top plate section 21. In particular, the flange portion (a portion D in Figure 26) on the inside of a curved portion 5A that is curved into an L shape in plan view of the drawn panel 5 assumes a molded state called stretch flanging and cracks develop in the high strength steel blade that has low extensibility. In particular, the extensibility is low in high strength steel that has a tensile strength of 590 MPa or above, which makes it difficult to process without generating cracks in the D portion.
    [0018] The corner where the vertical wall 22 on the outside of a curved portion 2A meets the top plate section 21 (a portion C in Figure 26) is a shape that sticks out in a large amount and predictably, this causes the development of cracks in the high strength steel blade which has low extensibility due to the steel raw material blade 3 which is quite stretched.
    [0019] A more detailed explanation follows. Figure 27 is a plan view that explains the flow of material during stretching.
    [0020] The vertical walls 12, 14 on the outer periphery and on the inner periphery of the curved portion 1A are formed at the same time when the stretched panel 5 is molded and the molding is therefore carried out by making material influence both sides of a top plate section 11 as illustrated in Figure 27, without the steel raw material blade moving significantly in the portion that forms the top plate section 11.
    [0021] In particular, the steel raw material blade 3 in the portion that forms the inner periphery of the curved portion 1A (portion D in Figure 26 and Figure 27) is shifted towards the outside of the inside of the curvature of the curved portion 1A and is quite stretched in radial directions of the curved portion 1A, which in this way takes on the molded state called stretch flanging. Cracks are thus developed in the high strength steel blade that has low extensibility.
    [0022] Since the portion C in Figure 26 has a shape that protrudes in a large amount in the corner of the outer periphery of the curved portion 1 A, the steel raw material blade is quite stretched and cracks are generated in the blade of high strength steel that has low extensibility similar to that in the D portion.
    [0023] Therefore, conventionally, components that are curved in an L shape along the longitudinal direction are difficult to form with the use of the steel raw material blade 3 formed from the high strength steel blade which has low extensibility and in particular when formed from the high strength steel blade which has a tensile strength of 590 MPa or greater and thus the steel blade which has comparatively low tensile strength and excellent extensibility is employed as the raw material blade of steel 3. Increasing the thickness of the blade is therefore necessary to ensure a specific resistance, which conflicts with requirements to reduce vehicle weight.
    [0024] An objective of the present invention is to provide technology that allows the manufacture of a press component that has an L-shaped hat cross section due to having a hat-shaped cross section and a curved portion that is curved along the longitudinal direction in plane view and which has excellent yield without causing creases or cracks to be generated, performing press molding on the metal raw material blade formed from the metal raw material blade that has a tensile strength of 200 MPa to 1,600 MPa and in particular, the sheet of metal raw material formed from the high strength steel blade that has a tensile strength of 590 MPa or greater. SOLUTION TO THE PROBLEM
    [0025] Aspects of the present invention are listed below
    [0026] (1) A manufacturing method for a press component in which press work is performed on a metal raw material blade to mold a press component that has an L-shaped hat-shaped cross-section formed by a hat-shaped cross section configured by a top plate section, two vertical walls connected to both sides of the top plate section and two flanges connected to the two respective vertical walls and from a curved portion that curve along the longitudinal direction in plan view, or a press component that has such an L-shaped hat cross section over a portion thereof, characterized by the fact that what the method comprises molding the press component by :
    [0027] place the sheet of metal raw material between a hole punch and a disc holder, and a cushion, a matrix and a folder;
    [0028] press and tighten a portion of the metal raw material blade to form the top plate section against the hole punch using the pad and press and tighten a portion of the metal raw material blade that will be in the outside the curved portion than the metal raw material blade portion to form the top plate section against the die with the use of the disc fastener; and
    [0029] after molding the vertical wall on the inner periphery of the curved portion and the flange portion connected to that vertical wall by working the metal raw material blade by moving relatively the folder in the direction where the hole punch is positioned,
    [0030] mold the vertical wall on the outer periphery of the curved portion and the flange portion connected to that vertical wall, moving relative to the matrix and the disc holder in the direction where the disc holder is positioned in relation to the blade. metal raw material and working the metal raw material blade while maintaining the state in which the metal raw material blade is pressed and pressed against the die by the disc fastener.
    [0031] Namely, in the present invention, after molding the vertical wall and the flange portion on the inner periphery of the curved portion by moving the folder in the direction where the hole punch is positioned while the metal raw material blade portion to form the top plate section it is pressed and pressed against the hole punch by the pad and as long as the portion of the metal raw material blade that will be more outside the curve in the L shape portion than the portion of the blade of metal raw material to form the top plate section is pressed and pressed against the die by the disc fastener, the vertical wall and the flange portion on the outer periphery of the curved portion are shaped by moving the die and the fastener disc in relation to the metal raw material blade in the direction the disc holder is positioned while maintaining a state in which the metal raw material blade is pressed and pressed against the die by the disc fastener.
    [0032] In doing so, the metal raw material blade is only stretched from the inner periphery of the curved portion during molding and the portion of the metal raw material blade to form the top plate section influences the inner periphery of the curved portion, due to not forming the vertical wall and the flange portion on the outer periphery of the curved portion in the process that shapes the vertical wall and the flange portion on the inner periphery of the curved portion. Therefore, in contrast to stretching cases, the portion of the metal raw material blade to form the inner periphery of the curved portion does not move significantly from the inner periphery towards the outer periphery of the curvature of the curved portion in the molding procedure. In addition, the metal raw material blade folds as a whole due to the front ends of the longitudinal direction of the metal raw material blade that influence the inner periphery of the curved portion and the flange portion on the inner periphery of the curved portion tends to become compressed. The amount of stretching of the flange portion at the inner periphery of the curved portion during molding is, therefore, considerably decreased compared to stretching.
    [0033] In the molding procedure for the vertical wall portion and the flange portion on the inner periphery of the curved portion, a state is reached in which there is residual compression stress due to influx of the top plate section and the flange portion on the outer periphery in the direction to where on the inside of the curved portion. The material is accordingly able to be quite stretched in the procedure to mold the vertical wall and the flange portion on the outer periphery of the curved portion and the corner where the vertical wall and the top plate section meet on the outer periphery of the curved portion as well it is shaped into a shape from a state where there is residual compression stress. The required extensibility of the material is, therefore, less than cases in which stretching is carried out by molding itself from a state without compression stress.
    [0034] Therefore, the stretching of the metal raw material blade can be reduced on the flange portion on the inner periphery of the curved portion and a corner portion where the vertical wall and the top plate section meet on the outer periphery of the curved portion, where cracks are developed due to the metal raw material blade being quite stretched in stretching of the related technology when a high strength metal blade (for example, high tensile steel sheet which has a tensile strength of 590 MPa or more) is employed. This makes it possible to mold without cracking even when a sheet of high-strength metal raw material that has low extensibility is used.
    [0035] In addition, folding is performed on the vertical wall and on the flange portion on the inner periphery of the curved portion with the use of the folder and because it does not require the regions of creasing inhibition that were necessary during stretching for the portion on the periphery interior of the curved portion and a longitudinal direction front end portion, the metal raw material blade can be made smaller by a corresponding amount, which allows portions eliminated by trimming after molding to be reduced and allows molding high yield of material to be achieved.
    [0036] (2) The manufacturing method for a press component of (1), in which: the hole punch has a shape that includes side shapes of blade thickness rear face of each top plate section, of the vertical wall and the flange portion connected to the vertical wall positioned on the inner periphery of the L-shaped curved portion; the disc holder has a shape that includes the lateral shape of the blade-thickness rear face of the flange portion connected to the vertical wall positioned on the outer periphery of the curved portion; the cushion has a shape so as to be turned towards the disc holder and has a shape that includes the side shape of the blade thickness front face of the top plate section; the matrix has a shape that includes the lateral shapes of the blade thickness front face of each vertical wall positioned on the outer periphery of the curved portion and the flange portion connected to that vertical wall; and the bender has a shape that includes the lateral shape of the blade thickness front face of each vertical wall positioned on the inner periphery of the curved portion and the flange portion connected to that vertical wall.
    [0037] (3) The manufacturing method for a press component of (1) or (2), wherein the metal raw material blade is a pre-worked metal blade.
    [0038] (4) The manufacturing method for a press component of any one of (1) to (3), in which after molding the press component, the press component is taken out of the mold by fixing the disc so that it does not move in relation to the hole punch and move the cushion, die and folder relatively away from the disk holder and the hole punch, in such a way that the disk holder does not press the molded press component against the matrix under pressure.
    [0039] (5) The manufacturing method for a press component of any one (1) to (4), wherein the metal raw material blade is a high tensile steel blade that has a thickness of blade from 0.8 mm to 3.2 mm and a tensile strength of 590 MPa to 1,800 MPa.
    [0040] (6) The manufacturing method for a press component of any one (1) to (5), wherein: the width of the top plate section in flat view is from 30 mm to 400 mm; the height of the vertical walls in side view is 300 mm or less; and the curvature in the inner periphery of the curved portion in plan view is 5 mm or more.
    [0041] (7) A manufacturing device for a press component, characterized by the fact that the manufacturing device comprises a hole punch and a disc holder and a pad, a matrix and a folder that are arranged facing the hole punch and the disc fastener, in which the manufacturing device performs press work on a metal raw material blade to mold a press component that has an L-shaped hat-shaped cross-section formed from a cross-section hat-shaped configured by a top plate section, two vertical walls connected to both sides of the top plate section and two flanges connected to two respective vertical walls and from a curved portion that curves along the direction longitudinal plane view, or a press component that has such an L-shaped hat-shaped cross section over a portion thereof, the manufacturing device molding the pr component essay:
    [0042] performing the first impression that molds the vertical wall on the inner periphery of the curved portion and the flange portion connected to that vertical wall by the cushion that presses and tightens a portion of the metal raw material blade to form the section of top plate against the hole punch, the disc holder pressing and tightening a portion of the metal raw material blade that will be more on the outside of the curve portion than the metal raw material blade portion for forming the top plate section against the die and working the sheet of metal raw material by moving the folder relatively in the direction where the hole punch is positioned; and
    [0043] performing a second molding to mold the vertical wall on the outer periphery of the curved portion and the flange portion connected to that vertical wall moving relatively, after the first molding has been carried out, the die and the disc fastener in the direction where the disc holder is positioned in relation to the metal raw material blade and working the metal raw material blade while maintaining the state in which the metal raw material blade is pressed and pressed against the matrix by the disc holder.
    [0044] (8) The manufacturing device for a press component of (7), which additionally includes a locking mechanism that secures the disc holder in such a way that the disc holder cannot move in relation to the punch during demoulding after molding has been completed.
    [0045] (9) The manufacturing device for a press component of (7) or (8), which additionally includes a sub-base that supports the cushion and the die so that they are able to be raised and lowered and that it is configured integrated together with the folder; and a matrix base that supports the sub-base in order to be insertable and retractable.
    [0046] (10) The manufacturing device for a press component of (7) or (8), which additionally includes: a base sub-base that supports the die in order to be able to be raised and lowered and that is configured integrated with the folder; and a matrix base that supports the cushion in order to be able to be raised and lowered and that supports the sub-base in order to be insertable and retractable.
    [0047] (11) A press component that has a hat-shaped cross-section cut configured from a top plate section, two vertical walls connected to both sides of the top plate and two flange portions connected to the two respective vertical walls and which has a curved shape in an L shape along the longitudinal direction in plan view due to including a curved portion, in which: the press component is a press shaped body configured using a blade of high tensile steel that has a blade thickness of 0.8 mm to 3.2 mm and the tensile strength of 590 MPa to 1,800 MPa as a metal raw material blade; the width of the top plate section in flat view is 30 mm to 400 mm, the height of the vertical walls in side view is 300 mm or less and the curvature of the inner periphery of the curved portion in flat view is 5 mm or more; and the proportional decrease in blade thickness, as calculated by ((maximum blade thickness value - minimum blade thickness value) / minimum blade thickness value) x 100, is 15% or less.
    [0048] (12) The press component of (11) in which the press component is an internal panel of column A which is a structural member of an automobile. ADVANTAGE EFFECTS OF THE INVENTION
    [0049] The present invention allows the manufacture of a press component that has a hat-shaped cross-section and an L-shaped portion that is curved along the longitudinal direction in flat view and that has excellent yield without making creases or cracks are generated by performing press molding on the metal raw material blade formed from the metal raw material blade that has tensile strength from 200 MPa to 1,600 MPa and in particular, a high blade strength material of metal raw material that has a tensile strength of 590 MPa or greater. BRIEF DESCRIPTION OF THE DRAWINGS
    [0050] Figures 1A to 1E are cross sections that illustrate a mold configuration and molding process according to the present invention.
    [0051] Figures 2A to 2E are cross sections showing another mold configuration and mold process according to the present invention.
    [0052] Figure 3A is a plan view showing the shape of a sheet of raw metal material before molding; and Figure 3B is a plan view showing the shape of the metal raw material blade after a molding procedure.
    [0053] Figure 4 is a plan view illustrating material flow in the present invention.
    [0054] Figures 5A to 5D are explanatory diagrams that illustrate an example of a mold employed in the present invention.
    [0055] Figures 6A to 6D are explanatory diagrams that illustrate another example of a mold employed in the present invention.
    [0056] Figures 7A to 7D are explanatory diagrams that illustrate another example of a mold employed in the present invention.
    [0057] Figure 8 is an exploded perspective view of the mold shown in Figure 7.
    [0058] Figures 9A to 9C illustrate a press component 1 molded in Comparative Examples 1 to 3 and Examples 1 to 3 and are a front view, a plan view and a right side view, respectively.
    [0059] Figure 10 is a plan view showing the shape of a sheet of metal raw material used in Comparative Examples 1 to 3.
    [0060] Figure 11 is a plan view showing the shape of a sheet of metal raw material used in Examples 1 to 3.
    [0061] Figure 12 is a perspective view that illustrates a configuration of the mold used in Examples 1 to 3.
    [0062] Figure 13A is a plan view showing the shape of the metal raw material blade used in Example 4; and Figure 3B is a perspective view of a press molded component.
    [0063] Figure 14A is a plan view showing the shape of a metal raw material blade used in Example 5; and Figure 14B is a perspective view of a press molded component.
    [0064] Figure 15 is a plan view showing the shape of a sheet of metal raw material used in Example 6.
    [0065] Figures 16A to 16C illustrate an intermediate shape molded in Example 6 and are a front face view, a plan view and a right side view, respectively.
    [0066] Figures 17A to 17C illustrate the shape of a press component molded in Example 6 and are a front face view, a plan view and a right side view, respectively.
    [0067] Figure 18 is a perspective view illustrating a mold configuration for performing molding in Example 6 using the present invention.
    [0068] Figure 19 is a perspective view that illustrates an example of a frame member that has a cross section in the shape of a hat and that has a straight shape along the longitudinal direction in plan view and in side view.
    [0069] Figure 20 is an explanatory diagram of a front column that is a frame member that has a hat-shaped cross section; Figure 20A is a perspective view; and Figure 20B is a plan view.
    [0070] Figure 21 is a perspective view that illustrates a component that has a cross-section in the shape of a hat and that has a curved shape in an L shape along the longitudinal direction in plan view.
    [0071] Figure 22 is a perspective view that illustrates the state of a press component that has a cross-section in the shape of a hat and that has a curved shape in an L shape along the longitudinal direction manufactured by bending.
    [0072] Figure 23 is an explanatory diagram that illustrates a component to be formed that is curved in an L shape along the longitudinal direction, Figure 23A is a perspective view; and Figure 23B is a plan view.
    [0073] Figure 24 is a plan view showing the shape of a sheet of metal raw material in stretching and a region of inhibition of creases in the sheet of metal raw material.
    [0074] Figures 25A to 25D are cross-sections that illustrate a drawing template and a drawing procedure.
    [0075] Figure 26 is a perspective view of a drawn panel formed by drawing.
    [0076] Figure 27 is a plan view that explains material flow during stretching. DESCRIPTION OF MODALITIES
    [0077] A press component according to the present invention and a manufacturing method for it are explained in sequence below. 1. PRESS COMPONENT 1
    [0078] As in the example of the shape described above in Figure 21, the press component 1 has a cross section in the shape of a hat and has the curved portion 1A which is curved in an L shape along the longitudinal direction in plan view.
    [0079] The press component 1 has a hat-shaped cross section configured from the top plate section 11, the vertical walls 12, 14 connected to both sides of the top plate section 11 and flange portions 13, 15 connected to the respective vertical walls 12, 14 and is formed in an L shape in plan view, due to the curvature along the longitudinal direction in the curved portion 1A (the directions of the double-headed arrow in Figure 21).
    [0080] Press component 1 is generally used in automotive frame components and is configured from the metal raw material blade formed from the high tensile steel sheet which has a blade thickness of 0.8 mm to 3.2 mm and also has a tensile strength of 590 MPa to 1,800 MPa. The tensile strength of the metal raw material blade is preferably from 200 MPa to 1,800 MPa in order to ensure qualities such as the strength of the frame component for an automobile and the blade thickness can be reduced when the tensile strength is reduced. 500 MPa or above and even more when the tensile strength is 590 MPa or above, with reduced blade thickness being preferred due to the reduction in component weight. In addition, 700 MPa or greater is more preferred.
    [0081] In cases where such a high strength steel blade is employed, the inflow resistance of the metal raw material blade during the molding of the vertical wall 14 and the flange portion 15 on the inner periphery of the curved portion 1A it becomes larger when the width of the top plate section 11 is too wide in plan view and the inflow of the metal raw material blade towards the inner periphery of the curved portion 1A becomes insufficient. Therefore, the width of the top plate section 11 is preferably 400 mm or less. However, when the width of the top plate section 11 is set too narrow, sufficient cushion pressure cannot be ensured due to having to make the pressure device for the cushion, such as a gas cushion, small. The width of the top plate section 11 is therefore preferably 30 mm or more.
    [0082] Furthermore, when the vertical walls 12, 14 are too high in lateral view, the resistance to inflow of a metal raw material sheet during molding of the vertical wall 14 and the flange portion 15 on the inner periphery of the curved portion 1A it becomes large and the influx of sheet of metal raw material to the inner periphery of the curved portion 1A becomes insufficient. Therefore, the height of the vertical walls 12, 14 is preferably 300 mm or less.
    [0083] When the curvature of the inner periphery of the curved portion 1A is too small in plan view, the influx of metal raw material blade to the inner periphery of the curved portion 1A during the molding of the flange portion 15 on the inner periphery of the curved portion 1A becomes insufficient. Therefore, the curvature of the vertical wall 14 at the inner periphery of the curved portion 1A is preferably 5 mm or more in plan view.
    [0084] Therefore, the width of the top plate section 11 is preferably 30 mm to 400 mm in plan view, the height of the vertical walls 12, 14 is preferably 300 mm or less in side view and the curvature of the inner periphery the curved portion 1A is preferably 5 mm or more in plan view.
    [0085] Furthermore, the proportional decrease in the blade thickness of the press component 1 as calculated by ((maximum blade thickness value - minimum blade thickness value) / maximum blade thickness value) x 100 is 15% or less. Until now there has been no press component 1 with such a low proportional decrease in blade thickness. Having such a low proportional decrease in the blade thickness of the press component 1 which is a structural member of an automobile gives excellent collision safety performance and allows vehicle weight reduction to be achieved once the leaf configuration is made high tensile steel with a tensile strength of 590 MPa to 1,800 MPa. 2. MANUFACTURING METHOD AND MANUFACTURING DEVICE FOR PRESS COMPONENT
    [0086] Figure 1A to Figure 1A are cross-sections illustrating a mold configuration and molding process according to the present invention.
    [0087] The mold illustrated in Figure 1A to Figure 1E is employed in the present invention to mold the press component 1 by molding the metal raw material sheet by press.
    [0088] The mold includes a hole punch 72 and a disk holder 73 and a pad 74, a die 71 and a folder 75 that are positioned facing hole punch 72 and disk holder 73.
    [0089] Hole punch 72 has a shape that includes blade-shaped rear face side shapes of the top plate section 11 of the press component 1, the vertical wall 14 positioned on the inner periphery of the curved portion 1A and the flange portion 15.
    [0090] The disc holder 73 has a shape that includes the lateral shape of the blade thickness rear face of the flange portion 13 connected to the vertical wall 12 positioned on the outer periphery of the curved portion 1A.
    [0091] The cushion 74 is formed so that it faces towards the disc holder 73 and has a shape that includes the side shape of the blade thickness front face of the top plate section 11.
    [0092] The matrix 71 has a shape that includes the respective side shapes of the blade thickness front face of the vertical wall 12 and the flange portion 13 that are positioned on the outer periphery of the curved portion 1A.
    [0093] The folder 75 has a shape that includes the respective side shapes of the front face with blade thickness of the vertical wall 14 and the flange portion 15 that are positioned on the outer periphery of the curved portion 1 A.
    [0094] Figures 2A to Figure 2E are cross sections showing another mold configuration and another molding process according to the present invention.
    [0095] The differences of the mold illustrated in Figure 1 are that a locking mechanism 76, described later, is installed in the hole punch 72 and that the folder 75 is installed in a sub-base (not shown).
    [0096] The locking mechanism 76 is configured from a pin arranged to be retractably inserted into the hole punch 72. The locking mechanism 76 is completely housed in the hole punch 72 from the beginning of the molding to the dead center of the bottom of the hole. molding (Figure 2A to Figure 2D) and then at the neutral point at the bottom of the molding, the locking mechanism 76 is designed towards the side of the disc holder 73 and fixes the disc holder 73 to the hole punch 72. During demoulding, the mechanism locking mechanism 76 prevents the molded press component 1 from being damaged by the cushion pressure reaching a state in which the disc holder 73 is fixed to the hole punch 72 while the folder 75, the cushion 74 and the sub-base are raised in demoulding.
    [0097] A mechanism that fixes (retains) the demolding positional relationship between the cushion 74 and the sub-base (the folder 75) and the matrix 75 (stretching matrix) can be used as the locking mechanism 76. For example , the configuration can be such that (a) the cushion 74 is fixed to the sub-base and at the same time the bender 75 (stretching matrix) is fixed to the cushion 74 or the sub-base when demoulding, (b) the separation between disc holder 73 and cushion 74 is fixed when demoulding by inserting a spacer, or (c) the positional relationship between cushion 74 and folder 75 is fixed (retained) when demolding. The sub-base is described below.
    [0098] The sheet of metal raw material is molded into the press component 1 using a mold.
    [0099] Figure 3A is a plan view illustrating a state prior to molding a sheet of metal raw material 8. Figure 3B is a plan view illustrating the shape of the sheet of metal raw material 8 over a molding procedure. Figure 4 is a plan view illustrating material flow in the present invention.
    [00100] First, as shown in Figure 1A, the metal raw material blade 8 that has the shape shown in Figure 3A is placed between the hole punch 72 and the disc holder 73 and the cushion 74, the die 71 and the folder 75.
    [00101] Next, as illustrated in Figure 1B, the metal raw material blade portion 8 to form the top plate section 11 is pressed against the punch 72 by the pad 74 under pressure and, although tightened in this way, a portion of the metal raw material blade 8 further out of the curved portion 1A than the portion for forming the top plate section 11 is pressed against the die 71 by the disc fastener 73 under pressure and tightened.
    [00102] Then, as shown in Figure 1C, the metal raw material blade 8 is molded in the shape shown in Figure 3B by moving relatively the folder 75 in the direction where the hole punch 72 is placed, working at sheet of metal raw material 8 and molding the vertical wall 14 and the flange portion 15 on the inner periphery of the curved portion 1 A.
    [00103] In doing so, a portion of the metal raw material blade 8 sandwiched between the hole punch 72 and disc holder 73 and pad 74 and die 71, also influences the inner periphery of the curved portion 1A and it is molded due to the metal raw material blade 8 being removed only from the inside of the curved portion 1A.
    [00104] Thus, different from cases in which it is removed during stretching, it is both the outside and the inside of the curved portion 1A (see Figure 27), as illustrated in Figure 4, in the flange portion (the portion D) at the inner periphery of the curved portion 1A, the metal raw material blade 8 does not move to a large extent in the molding procedure from the inside to the outside of the curvature of the curved portion 1A and the material blade raw metal 8 is generally bent by a longitudinal front end of the metal raw material blade 8 which influences the inner periphery of the curved portion 1A. The flange portion 15 that forms the inside of the fold (the D portion) on the inside of the curved portion 1A tends to be compressed. The amount of stretching of the flange portion 15 on the inner periphery of the curved portion 1A (the D portion) during molding is, therefore, greatly reduced compared to during stretching.
    [00105] Then, as illustrated in Figure 1 (d), after molding the vertical wall 14 and the flange portion 15 on the inside of the curved portion 1A has finished, the metal raw material blade 8 is pressed against the die 71 by the disc holder 73 under pressure, the die 71 and the disc holder 73 are moved relative to the metal raw material blade 8 in the direction where the disc holder 73 is positioned while maintaining the tight state, the metal raw material blade 8 is worked and the vertical walls 12 and the flange portions 13 on the outer periphery of the curved portion 1A are molded. The press component 1 shown in Figure 3 is thus molded.
    [00106] In doing so, in the procedure for molding the vertical wall 14 and the flange portion 15 on the inner periphery of the curved portion 1A, the portion for forming the top plate section 11 and the flange portion 15 both influence to the inner periphery of the curved portion 1A, which gives compression in the longitudinal direction and results in a state in which there is residual compression stress. The corner where the vertical wall 12 and the top plate section 11 meet at the outer periphery of the curved portion 1A which is quite stretched in the molding procedure (a portion C in Figure 4) is thus also shaped into a shape being removed from the state in which there is residual compression stress. The required extensibility of the material is therefore less compared to cases in which stretching is carried out by molding itself from a state without compression stress. Cracks are suppressed as they develop and favorable molding is allowed as a result, even when a high strength material that has low extensibility (for example, high tensile steel grade 590 MPa or above) is employed as the raw material blade of metal 8.
    [00107] Bending is performed with the use of folder 75 during the molding of the vertical wall 14 and the flange portion 15 on the inner periphery of the curved portion 1A and molding with a metal raw material blade 8 is possible accordingly and it is possible achieving a high material yield, due to not requiring the crease inhibition region that was required during stretching for the portion on the inner periphery of the curved portion 1A and for a longitudinally directed front end portion.
    [00108] Finally, as shown in Figure 1E, after the molding of the press component 1 has been completed, in order to remove the molded press component 1 from the mold after molding, the disc fastener 73 is fixed so as not to to be moved relatively to the hole punch 72 using, for example, the locking mechanism 76, the disc holder 73 does not press the molded press component 1 against the die 71 and the pad 74 and die 71 and the folder 75 is moved relatively away from the disc holder 73 and the hole punch 72. The press component 1 is thus able to be removed without being deformed or damaged by being pressed by the pad 74 or the disk holder 73.
    [00109] The manufacturing device for the press component has been outlined above and the detailed explanation regarding the mold configuration follows.
    [00110] Figure 5A to Figure 5D are explanatory diagrams that illustrate an example of a mold employed by the present invention. Locking mechanism 76 is omitted from Figure 5 to Figure 7.
    [00111] In the mold, the folder 75, the matrix (stretch matrix) 71 and the cushion 74 are each directly supported by a matrix base 77 and each is independently driven in relation to the matrix base 77. The mold it can be made more compact in general since a frame or the like is not employed to support folder 75 or disc holder 73.
    [00112] Figure 6A to Figure 6D are explanatory diagrams that illustrate another example of a mold employed in the present invention.
    [00113] The mold has a structure in which sub-bases 75 cover the cushion 74 and the matrix (drawing matrix) 71 and the eccentric load of the cushion 74 and the matrix (drawing matrix) 71 is terminated by the sub- base 75 which is integrated together with a folder. An improvement is thus achieved in a mold format by the exemplary mold illustrated in Figure 5.
    [00114] Figure 7A to Figure 7D are explanatory diagrams that illustrate another example of a mold employed in the present invention. Figure 8 is an exploded perspective view of the mold.
    [00115] Such a mold allows a load burden of the cushion 74 that is exerted on the bender 75 to be avoided by incorporating the cushion 74 in the matrix base 77 instead of the bender 75. An improvement is thus achieved in deformation of sub-base mold by the exemplary mold illustrated in Figure 6 since orthogonal direction charge transmitted to the sub-base is entirely received from the folder.
    [00116] The examples of molds illustrated in Figure 5A to Figure 5D, in Figure 6A to Figure 6D and in Figure 7A to Figure 7D are all molds that have structures that are particularly effective for implementing the manufacturing method for in accordance with the present invention. However, since the structure that suppresses mold deformation affects the cost and size of the mold, the mold structure to be employed can be decided appropriately considering the size and shape of the component to be manufactured and the stiffness required by the mold in view of the strength of the steel raw material blade to be employed. EXAMPLES
    [00117] Figure 9A to Figure 9C illustrate the press component 1 to be molded in Comparative Examples 1 to 3 and Examples 1 to 3 and are a front face view, a plan view and a right side view, respectively. Figure 10 is a plan view illustrating the shape of the metal raw material blade 8 used in Comparative Examples 1 to 3. Figure 11 is a plan view illustrating the shape of the metal raw material blade 8 used in Comparatives 1 to 3. Figure 12 is a perspective view that illustrates the configuration of the mold used in Examples 1 to 3.
    [00118] The results for Comparative Examples 1 to 3 and Examples 1 to 6 are listed collectively in Table 1.
    [00119] In Comparative Examples 1 to 3 and Examples 1 to 3, the press component 1 which has the shape illustrated in Figure 9A to Figure 9C is manufactured with the use of a 1.2 mm thick steel blade mm and breaking strengths of 270 MPa, 590 MPa and 980 MPa as the sheet of metal raw material, with use as a fabrication method both a conventional drawing method and the present invention.
    * Satisfatório: nenhuma fissura foi gerada; Insatisfatório: fissuras foram geradas.[00120] Note that the units of the numerical values in Figure 9 to Figure 11 are millimeters. Note that the material yields in Table 1 are ratios of the material that forms the component for the metal raw material blade. TABLE 1 * Satisfactory: no cracks were generated; Unsatisfactory: cracks were generated.
    [00121] Comparative Example 1 and Example 1 are examples, where pressing was performed using low strength steel blade with excellent extensibility and a breaking strength of 270 MPa. Although molding was successful without cracking in both cases, it was confirmed that Example 1 was highly advantageous over Comparative Example 1 in terms of material yield.
    [00122] Comparative Examples 2 and 3 and Examples 2 and 3 are examples in which pressing was performed using a high strength steel blade with low extensibility as the metal raw material blade. Although cracks were developed and molding was not achieved in Comparative Examples 2 and 3, favorable molding without cracking was achieved in Examples 2 and 3.
    [00123] Figure 13A is a plan view showing the shape of the metal raw material blade 8 used in Example 4. Figure 3B is a perspective view of the press component 1.
    [00124] Example 4 is an example in which the press component 1 which has the shape illustrated in Figure 3B was molded using a 1.2 mm blade thickness steel blade which has a resistance to breakage 590 MPa as the metal raw material blade, worked in the format illustrated in Figure 13A. It was confirmed that favorable molding was possible even when such a non-flat metal raw material blade is employed.
    [00125] Figure 14A is a plan view showing the shape of the metal raw material blade 8 used in Example 5. Figure 14B is a perspective view of the press component 1.
    [00126] Example 5 is an example where molding was performed to the shape illustrated in Figure 14B using a steel blade that has a blade thickness of 1.2 mm, a tensile strength of 590 MPa and a shape flat plate illustrated in Figure 14A, as the metal raw material blade. Although the top plate section was not boring, favorable molding was achieved by working the top plate section by working with the use of the pad.
    [00127] Figure 15 is a plan view showing the shape of the metal raw material blade employed in Example 6. Figures 16A to 16C illustrate an intermediate shape molded in Example 6 and are a front view, a view plane and a right side view, respectively. Figures 17A to Figure 17C illustrate the shape of the press component 1 molded in Example 6 and are a front face view, a plan view and a right side view, respectively. Figure 18 is a perspective view illustrating a mold configuration for molding using the present invention in Example 6.
    [00128] Example 6 is an example in which the complicated shape illustrated in Figures 17A to Figure 17C was molded using a high strength steel blade that has a blade thickness of 1.2 mm, low extensibility and resistance to 980 MPa traction, like the metal raw material blade. The metal raw material blade that has the shape shown in Figure 15 was used as the metal raw material blade and with the use of a mold that has the configuration illustrated in Figure 18, the intermediate shape illustrated in Figures 16A Figure 16C was molded using the present invention and the press component 1 which has the shape illustrated in Figures 17A to Figure 17C was then favorably shaped without generating cracks or creases generated by additional post-work. EXPLANATION OF NUMERICAL REFERENCES 1 press component 1The curved portion 8 sheet of metal raw material 11 top plate section 12 vertical wall on the outer periphery of the curved portion 13 flange portion on the outer periphery of the curved portion 14 vertical wall on the inner periphery of the curved portion 15 flange portion on the inner periphery of the curved portion 2 component 21 top plate section 22 vertical wall outside the L-shaped curve 23 flange connected to the vertical wall outside the L-shaped curve 24 vertical wall on the inside of the L-shaped curve 25 flange connected to the vertical wall on the inside of the L-shaped curve 26 steel raw material blade 41 matrix 42 hole punch 43 disc fastener 5 drawn panel 6 panel stretched 71 matrix 72 hole punch 73 disc holder 74 cushion 75 folder
    权利要求:
    Claims (10)
    [0001]
    1. Manufacturing method for a press component (1), where the press work is carried out on a sheet of raw metal material (8) to mold a press component (1) that has a cross-section in shape L-shaped hat box formed by a hat-shaped cross section configured by a top plate section (11), two vertical walls connected to both sides of the top plate section (11) and two flanges connected to the two respective vertical walls and from a curved portion (1a) that curves along the longitudinal direction in plan view, or a press component (1) that has such an L-shaped hat-shaped cross section over a portion of the same, characterized by the fact that said method comprises molding the press component (1) by: (i) placing the sheet of metal raw material (8) between a hole punch (72) and a disc holder (73) , and a pad (74), a matrix (71) and a folder (75); (ii) press and tighten a portion of the metal raw material blade (8) to form the top plate section (11) against the hole punch (72) using the pad (74), and press and tighten a portion of the metal raw material blade (8) that will be more on the outside of the curve portion than the metal raw material blade portion (8) to form the top plate section (11) against the matrix (71) using the disc holder (73); and (iii) after molding the vertical wall (14) on the inner periphery of the curved portion (1a) and the flange portion (15) connected to that vertical wall (14) by working with the metal raw material blade (8 ) by moving the bender (75) relatively in the direction where the hole punch (72) is positioned, (iv) molding the vertical wall (12) on the outer periphery of the curved portion (1a) and the connected flange portion (13) to that vertical wall (12), moving relative to the matrix (71) and the disc holder (73) in the direction where the disc holder (73) is positioned in relation to the metal raw material blade (8 ) and working the metal raw material blade (8) while maintaining the state in which the metal raw material blade (8) is pressed and pressed against the die (71) by the disc holder (73).
    [0002]
    2. Manufacturing method for a press component (1), according to claim 1, characterized by the fact that: (i) the hole punch (72) has a shape that includes lateral shapes of a blade thickness rear face each within the top plate section (11), the vertical wall (14) positioned on the inner periphery of the curved portion (1a) and the flange portion (15) connected to that vertical wall (14); (ii) the disc holder (73) has a shape that includes the lateral shape of the blade thickness rear face of the flange portion (13) connected to the vertical wall (12) positioned on the outer periphery of the curved portion (1a); (iii) the cushion (74) is shaped so that it faces towards the disc holder (73) and has a shape that includes the side shape of the blade thickness front face of the top plate section (11); (iv) the matrix (71) has a shape that includes the lateral shapes of the blade thickness front face of each one between the vertical wall (12) positioned on the outer periphery of the curved portion (1a) and the flange portion (13 ) connected to that vertical wall (12); and (v) the folder (75) has a shape that includes the lateral shape of the blade thickness front face of each one between the vertical wall (14) positioned on the inner periphery of the curved portion (1a) and the flange portion ( 15) connected to that vertical wall (14).
    [0003]
    3. Manufacturing method for a press component (1) according to claim 1 or 2, characterized by the fact that the metal raw material blade (8) is a pre-worked metal blade.
    [0004]
    4. Manufacturing method for a press component (1) according to any one of claims 1 to 3, characterized in that, after molding the press component (1), the press component (1) is removed of the mold by fixing the disc holder (73) so that it does not move in relation to the hole punch (72) and move the cushion (74), the matrix (71) and the folder (75) relatively away from the disc (73) and hole punch (72), such that the disc holder (73) does not press the press component (1) molded against the die (71) under pressure.
    [0005]
    5. Manufacturing method for a press component (1) according to any one of claims 1 to 4, characterized by the fact that the metal raw material blade (8) is a high-tensile steel blade that it has a blade thickness of 0.8 mm to 3.2 mm and a tensile strength of 590 MPa to 1,800 MPa.
    [0006]
    6. Manufacturing method for a press component (1) according to any one of claims 1 to 5, characterized in that: (i) the width of the top plate section (11) in plan view is 30 mm to 400 mm; (ii) the height of the vertical walls in side view is 300 mm or less; and (iii) the curvature of the inner periphery of the curved portion (1a) in plan view is 5 mm or more.
    [0007]
    7. Manufacturing device for a press component (1), characterized by the fact that it comprises a hole punch (72) and a disc holder (73), and a pad (74), a matrix (71) and a folder ( 75) which are arranged facing the hole punch (72) and the disc holder (73), where the manufacturing device is configured to perform press work on a metal raw material blade (8) to mold a component press (1) which has an L-shaped hat-shaped cross-section formed from a hat-shaped cross-section configured by a top plate section (11), two connected vertical walls (12, 14) both sides of the top plate section (11) and two flanges (13, 15) connected to two respective vertical walls (12, 14) and from a curved portion (1a) that curves along the longitudinal direction in plan view, or a press component (1) that has such an L-shaped hat-shaped cross section the same, in which, in order to mold the press component (1), the manufacturing device: (i) is configured to perform the first molding that molds the vertical wall (14) on the inner periphery of the curved portion (1a ) and the flange portion (15) connected to that vertical wall (14) by the cushion (74) that presses and tightens a portion of the metal raw material blade (8) to form the top plate section (11) against the hole punch (72), and the disc holder (73) presses and tightens a portion of the metal raw material blade (8) that will be more on the outside of the curve portion than the portion of the blade metal raw material (8) to form the top plate section (11) against the die (71) and work the metal raw material blade (8) by moving relatively the bender (75) in the direction to where the hole punch (72) is positioned; and (ii) it is configured to perform the second molding to mold the vertical wall (12) on the outer periphery of the curved portion (1a) and the flange portion (13) connected to that vertical wall (12) moving relatively, after the first impression has been made, the matrix (71) and the disc holder (73) in the direction where the disc holder (73) is positioned in relation to the metal raw material blade (8) and work the blade of metal raw material (8) while maintaining the state in which the metal raw material blade (8) is pressed and pressed against the die (71) by the disc holder (73).
    [0008]
    8. Manufacturing device for a press component (1) according to claim 7, characterized in that it additionally comprises a locking mechanism that secures the disc holder (73) in such a way that the disc holder ( 73) cannot move in relation to the hole punch (72) during demoulding after the molding has been completed.
    [0009]
    9. Manufacturing device for a press component (1) according to claim 7 or 8, characterized in that it additionally comprises: (i) a sub-base that supports the cushion (74) and the die (71 ) in order to have the ability to be raised and lowered and which is configured integrated with the folder (75); and (ii) a matrix base (77) that supports the sub-base in order to be insertable and retractable.
    [0010]
    10. Manufacturing device for a press component (1) according to claim 7 or 8, characterized in that it additionally comprises: (i) a sub-base that supports the die (71) in order to have the ability to be raised and lowered and which is configured integrated with the folder (75); and (ii) a matrix base (77) that supports the cushion (74) in order to be able to be raised and lowered and that supports the sub-base in order to be insertable and retractable.
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    ES2728702T3|2019-10-28|
    EP2942123A1|2015-11-11|
    TWI568518B|2017-02-01|
    US20150336619A1|2015-11-26|
    BR112015015963A2|2017-07-11|
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    RU2015131837A|2017-02-09|
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    MX361908B|2018-12-19|
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    WO2014106932A1|2014-07-10|
    MX2015008684A|2016-06-06|
    ZA201505250B|2016-04-28|
    JPWO2014106932A1|2017-01-19|
    KR20150103214A|2015-09-09|
    TW201436897A|2014-10-01|
    CA2896457C|2017-04-25|
    EP2942123A4|2016-06-01|
    TR201904517T4|2019-05-21|
    CA2896457A1|2014-07-10|
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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]|
    2019-09-10| B25D| Requested change of name of applicant approved|Owner name: NIPPON STEEL CORPORATION (JP) |
    2019-11-26| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-07-07| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-09-01| 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 20/12/2013, OBSERVADAS AS CONDICOES LEGAIS. |
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    PCT/JP2013/084299|WO2014106932A1|2013-01-07|2013-12-20|Press component and method and device for manufacturing same|
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