Method for producing press-molded article

Abstract

The present disclosure relates to a method for manufacturing a press-molded article, comprising: forming an intermediate molded article by press-molding; and forming a press-molded article by press-molding the intermediate molded article. The intermediate molded article includes a top plate portion, a pre-vertical wall portion, a pre-horizontal wall portion, a pre-bottom wall portion, and a protrusion portion. This press-molded article is provided with a top plate section, a vertical wall section, a transverse wall section, a bottom wall section, a first ridge line, a second ridge line, a third ridge line, and a collection section. The protruding portion is a plate-like portion adjacent to each of the pre-vertical wall portion, the pre-horizontal wall portion, and the pre-bottom wall portion. A press-molded article is formed from the intermediate molded article by deforming the protrusion by press-molding.

Description

Technical Field

[0001] The present disclosure relates to a method for manufacturing a press-formed product by press forming. Background Art

[0002] As described in Japanese Patent Gazette No. 6265315, there is known a technique for forming a groove-shaped member having a continuous flange portion by press forming. In addition, the continuous flange portion refers to a flange portion provided continuously at the end portion in the extension direction and the end portion in the width direction of the groove-shaped member. In the continuous flange portion, a bent portion (hereinafter referred to as a ridge line) is formed at the boundary between the portion forming the end portion in the extension direction of the groove-shaped member and the portion forming the end portion in the width direction of the groove-shaped member.

[0003] In the manufacturing method disclosed in Japanese Patent No. 6265315, when forming the above-mentioned component, an intermediate formed product having a continuous flange portion and a ridgeline is first formed from a blank by press forming. Subsequently, the channel-shaped component is formed by press forming the intermediate formed product. Summary of the invention

[0004] According to the technology disclosed in Japanese Patent No. 6265315, wrinkles can be suppressed around the ridges of the continuous flange. However, the method of Japanese Patent No. 6265315 cannot fully disperse the load applied to the intermediate formed product during the stamping process, which may cause cracks or wrinkles.

[0005] In one aspect of the present disclosure, it is desirable to suppress the generation of cracks or wrinkles during a press forming process.

[0006] One scheme of the present disclosure is a method for manufacturing a stamped product, which includes: forming an intermediate product by stamping a plate-shaped component; and forming a stamped product by stamping the intermediate product, the stamped product having a top plate portion, a longitudinal wall portion, a transverse wall portion, a bottom wall portion, a first ridge line, a second ridge line, a third ridge line, and a collection portion. The top plate portion is a plate-shaped portion having a longitudinal end and a transverse end. The longitudinal wall portion is a plate-shaped portion extending from the longitudinal end of the top plate portion. The transverse wall portion is a plate-shaped portion extending from the transverse end of the top plate portion, and the transverse wall portion is adjacent to the longitudinal wall portion. The bottom wall portion is a plate-shaped portion adjacent to the longitudinal wall portion and the transverse wall portion. The first ridge line forms a boundary between the longitudinal wall portion and the bottom wall portion. The second ridge line forms a boundary between the transverse wall portion and the bottom wall portion. The third ridge line forms a boundary between the transverse wall portion and the longitudinal wall portion. The collection portion is a portion connected to the ends of the first ridge line, the second ridge line, and the third ridge line. The bottom wall protrudes from the first ridge to the raised side, and the transverse wall protrudes from the third ridge to the raised side. The intermediate formed product comprises a top plate, a pre-longitudinal wall, a pre-transverse wall, a pre-bottom wall, and a raised portion. The pre-longitudinal wall is a plate-shaped portion extending from the longitudinal end of the top plate. The pre-transverse wall is a plate-shaped portion extending from the transverse end of the top plate. The pre-bottom wall is a plate-shaped portion adjacent to the pre-longitudinal wall and the pre-transverse wall. The raised portion is a plate-shaped portion adjacent to the pre-longitudinal wall, the pre-transverse wall, and the pre-bottom wall. In addition, the raised portion is located at a position closer to the raised side than the first ridge and the third ridge, and intersects with the pre-second ridge at a position closer to the raised side than the collection portion, and the pre-second ridge forms a boundary between the pre-transverse wall and the pre-bottom wall. The raised portion is deformed by stamping to form a stamped product from the intermediate formed product.

[0007] According to the above configuration, since the bulge is provided on the intermediate formed product, it is possible to suppress the load concentration during the press forming process, thereby suppressing the generation of cracks or wrinkles during the press forming process.

[0008] In one aspect of the present disclosure, a portion of the raised portion located closest to the top plate portion in a boundary between the raised portion and the pre-lateral wall portion may be a vertex. The vertex may be located near the top plate portion.

[0009] According to the above configuration, the concentration of load can be further suppressed during the press forming process of the intermediate formed product, so that the generation of cracks or wrinkles can be more appropriately suppressed during the press forming process.

[0010] In one aspect of the present disclosure, the raised portion may have a top end portion, which is an end portion located on the opposite side of the pre-bottom wall portion. The top end portion may extend along an end portion of the top plate portion.

[0011] According to the above configuration, the concentration of load can be further suppressed during the press forming process of the intermediate formed product, so that the generation of cracks or wrinkles can be more appropriately suppressed during the press forming process.

[0012] In one aspect of the present disclosure, the press-formed product may be bent so that an end portion located in the direction of the first ridgeline protrudes toward a side opposite to the bottom wall portion.

[0013] According to the above configuration, the occurrence of cracks or wrinkles can be suppressed during the process of forming the press-formed product.

[0014] In one aspect of the present disclosure, the press-formed product may be formed of a high-tensile-strength steel material having a tensile strength of 980 MPa or more.

[0015] According to the above configuration, the occurrence of cracks or wrinkles can be suppressed during the process of forming the press-formed product.

[0016] In one aspect of the present disclosure, the press-formed product may be formed of a high-tensile-strength steel material having a tensile strength of 1470 MPa or more.

[0017] According to the above configuration, the occurrence of cracks or wrinkles can be suppressed during the process of forming the press-formed product.

[0018] In one embodiment of the present disclosure, the collection portion may be a point-shaped portion.

[0019] According to the above configuration, the occurrence of cracks or wrinkles can be suppressed during the process of forming the press-formed product.

[0020] In one embodiment of the present disclosure, the collection portion may be a surface-shaped portion.

[0021] According to the above configuration, the occurrence of cracks or wrinkles can be suppressed during the process of forming the press-formed product.

[0022] In one aspect of the present disclosure, the press-formed product may be mounted on a vehicle.

[0023] According to the above configuration, the occurrence of cracks or wrinkles can be suppressed during the process of forming a press-formed product to be mounted on a vehicle.

[0024] In one aspect of the present disclosure, the press-formed product may be a component constituting a part of a vehicle body.

[0025] According to the above configuration, it is possible to suppress the occurrence of cracks or wrinkles in the process of forming the press-formed product constituting a part of the vehicle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a perspective view of the press-formed product according to the first embodiment.

[0027] Figure 2 It is a side view of the blank of the first embodiment.

[0028] Figure 3 It is a perspective view of an intermediate formed product in the method for manufacturing a press-formed product according to the first embodiment.

[0029] Figure 4 It is a perspective view of an intermediate formed product in the method for manufacturing a press-formed product according to the second embodiment.

[0030] Figure 5 It is a perspective view of a collection portion of a modification of the first embodiment and the second embodiment.

[0031] Figure 6 It is an explanatory diagram of the raised portion and the covering portion according to the first embodiment. DETAILED DESCRIPTION

[0032] Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0033] [1. First embodiment]

[0034] [(1) Stamped products]

[0035] The press-formed product 1 of the first embodiment is formed by press-forming a metal material (see Figure 1 ). In the first embodiment, a high tensile strength steel material having a tensile strength of 980 MPa or more is used as the metal material. However, the present invention is not limited thereto, and the metal material may be, for example, a high tensile strength steel material having a tensile strength of 1470 MPa or more, or a high tensile strength steel material having a tensile strength of less than 980 MPa, or stainless steel or iron.

[0036] In addition, as an example, the stamped product 1 is used as a component constituting a part of the vehicle body. However, not limited to this, the stamped product 1 can also be used as a component constituting a part other than the vehicle body in the vehicle, or as a component not installed in the vehicle.

[0037] The stamped product 1 is a plate-shaped component, and includes a top plate portion 2, a vertical wall portion 3, a horizontal wall portion 4, a bottom wall portion 5, a first wall portion 12, and a second wall portion 13. In addition, as will be described in detail below, the stamped product 1 has a first ridgeline 61 to a third ridgeline 63, and the ridgelines extend in different directions starting from a collection portion 60 as a point-shaped portion. In the following, the directions in which the first ridgeline 61 to the third ridgeline 63 extend are respectively recorded as a first direction D1 to a third direction D3.

[0038] The stamped product 1 is a groove-shaped component and extends from the first end 10 to the second end 11 along the first direction D1. In addition, the stamped product 1 has a curved shape in a manner that the first end 10 and the second end 11 protrude toward the opposite side of the bottom wall portion 5. In other words, the stamped product 1 has a curved shape in a manner that the center of the first direction D1 protrudes toward the bottom wall portion 5. Of course, the present invention is not limited to this, and the stamped product 1 may also be a shape extending in a straight line.

[0039] [(2) Top plate]

[0040] The top plate portion 2 is a plate-shaped portion extending from the first end 10 to the second end 11, and includes a longitudinal end portion 20, a lateral end portion 21, a protruding portion 22, and an opposite end portion 23 (see Figure 1 ). Similar to the press-formed product 1 , the top plate portion 2 is curved so that both ends in the first direction D1 protrude toward the side opposite to the bottom wall portion 5 .

[0041] The longitudinal end portion 20 is located at an end portion of the top plate portion 2 in the width direction of the press-formed product 1 (hereinafter also simply referred to as the width direction), and extends from the vicinity of the first end 10 to the second end 11 along the first direction D1.

[0042] The protrusion 22 is located near the first end 10 of the top plate 2 . The protrusion 22 is a portion that protrudes from an end in the width direction along the second direction D2 , and has a substantially triangular shape as an example.

[0043] The lateral end portion 21 is an end portion of the protruding portion 22 , and extends along the second direction D2 from an end portion of the longitudinal end portion 20 located on the first end 10 side.

[0044] The opposite end portion 23 is located on the opposite side of the protruding portion 22 of the top plate portion 2, and extends along the first direction D1 from the first end 10 to the second end 11. The opposite end portion 23 faces the longitudinal end portion 20 in the width direction.

[0045] [(3) First wall portion and second wall portion]

[0046] The first wall portion 12 is a plate-shaped portion that protrudes from the opposite end portion 23 along the third direction D3 (see Figure 1 ).

[0047] The second wall portion 13 is a plate-shaped portion that protrudes along the second direction D2 from an end portion of the first wall portion 12 that is located on the opposite side to the opposite side end portion 23. As one example, the second wall portion 13 is formed as a flange-shaped portion.

[0048] [(4) Vertical wall portion, horizontal wall portion, and bottom wall portion]

[0049] The vertical wall portion 3 is a plate-shaped portion extending from the longitudinal end portion 20 of the top plate portion 2 along the third direction D3. The vertical wall portion 3 extends along the first direction D1 and faces the first wall portion 12 in the width direction (see Figure 1 ).

[0050] The lateral wall portion 4 is a plate-shaped portion extending from the lateral end portion 21 of the top plate portion 2 in the third direction D3 and is adjacent to the vertical wall portion 3. The lateral wall portion 4 extends from the end portion of the vertical wall portion 3 located on the first end 10 side in the second direction D2.

[0051] The bottom wall portion 5 is a plate-shaped portion adjacent to the vertical wall portion 3 and the horizontal wall portion 4. The bottom wall portion 5 extends along the first direction D1 and the second direction D2.

[0052] In addition, the transverse wall portion 4 and the bottom wall portion 5 each intersect with the longitudinal wall portion 3 at a predetermined angle. As an example, the transverse wall portion 4 and the bottom wall portion 5 are both formed as elongated flange-shaped portions extending along the end of the longitudinal wall portion 3. In addition, the transverse wall portion 4 and the bottom wall portion 5 intersect at a predetermined angle. In addition, as an example, the predetermined angle may be greater than 90° and less than 135°.

[0053] In addition, the boundary between the longitudinal wall portion 3 and the bottom wall portion 5 forms the first ridgeline 61. In addition, the boundary between the transverse wall portion 4 and the bottom wall portion 5 forms the second ridgeline 62. In addition, the boundary between the transverse wall portion 4 and the longitudinal wall portion 3 forms the third ridgeline 63. As described above, the first ridgeline 61 to the third ridgeline 63 extend in different directions starting from the collection portion 60, and the collection portion 60 is adjacent to the longitudinal wall portion 3, the transverse wall portion 4, and the bottom wall portion 5. In addition, the bottom wall portion 5 extends from the first ridgeline 61 to the opposite side of the first wall portion 12 (in other words, the raised side), and the transverse wall portion 4 also extends from the third ridgeline 63 to the raised side.

[0054] [(5) Method for manufacturing press-formed product]

[0055] The method for manufacturing the press-formed product 1 includes a first step and a second step.

[0056] In the first step, a plate-shaped blank B (see FIG. 1 ) made of the above-mentioned metal material is formed by using a die (not shown) to form a mold. Figure 2 ) is press-formed to form the intermediate formed product 1A. As an example, the blank B has a curved shape. However, this is not limited to this, and the blank B may also be a flat shape.

[0057] In the first step, not only the blank B but also a plate-like member processed into a predetermined shape by press forming or the like may be press formed to form the intermediate formed product 1A.

[0058] In the second step, the intermediate formed product 1A is press-formed by using a die (not shown) to form the press-formed product 1. Specifically, the press-formed product 1 is formed from the intermediate formed product 1A by deforming the raised portion 7 in the intermediate formed product 1A, and the raised portion 7 is described below. More specifically, the press-formed product 1 is formed by pressing the raised portion 7 toward the collection portion 60. In addition, in the second step, in addition to the raised portion 7, other parts of the intermediate formed product 1A other than the raised portion 7 may be deformed.

[0059] [(6) Intermediate molded product]

[0060] The intermediate formed product 1A has a shape substantially the same as the stamped formed product 1, but is different from the stamped formed product 1 in that the intermediate formed product 1A has a raised portion 7 formed around the collection portion 60 of the stamped formed product 1 (see Figure 3 The intermediate molded product 1A includes a first wall portion 12 , a second wall portion 13 , a top plate portion 2 , a preliminary vertical wall portion 3A, a preliminary horizontal wall portion 4A, a preliminary bottom wall portion 5A, and a raised portion 7 .

[0061] The first wall portion 12, the second wall portion 13, and the top plate portion 2 of the intermediate formed product 1A have the same structure as the first wall portion 12, the second wall portion 13, and the top plate portion 2 of the stamped formed product 1. In addition, the preliminary longitudinal wall portion 3A, the preliminary transverse wall portion 4A, and the preliminary bottom wall portion 5A of the intermediate formed product 1A correspond to the longitudinal wall portion 3, the transverse wall portion 4, and the bottom wall portion 5 of the stamped formed product 1, respectively. However, since the ridge 7 is provided in the intermediate formed product 1A, the preliminary longitudinal wall portion 3A, the preliminary transverse wall portion 4A, and the preliminary bottom wall portion 5A of the intermediate formed product 1A are different from the longitudinal wall portion 3, the transverse wall portion 4, and the bottom wall portion 5 of the stamped formed product 1, respectively.

[0062] That is, the pre-longitudinal wall portion 3A is the same as the longitudinal wall portion 3, and is a plate-shaped portion extending from the longitudinal end portion 20 of the top plate portion 2 along the third direction D3. The pre-longitudinal wall portion 3A extends along the first direction D1 and is opposite to the first wall portion 12 in the width direction.

[0063] The preliminary transverse wall portion 4A is a plate-shaped portion extending from the transverse end portion 21 of the top plate portion 2 in the third direction D3 similarly to the transverse wall portion 4 .

[0064] The preliminary bottom wall portion 5A is a plate-shaped portion adjacent to the preliminary vertical wall portion 3A and the preliminary horizontal wall portion 4A similarly to the bottom wall portion 5 , and extends along the first direction D1 and the second direction D2 .

[0065] In addition, the pre-transverse wall portion 4A and the pre-bottom wall portion 5A each intersect with the pre-longitudinal wall portion 3A and the raised portion 7 at a predetermined angle. As an example, the pre-transverse wall portion 4A and the pre-bottom wall portion 5A are both formed as flange-shaped portions at the ends of the pre-longitudinal wall portion 3A and the raised portion 7. In addition, the pre-transverse wall portion 4A and the pre-bottom wall portion 5A intersect at a predetermined angle. In addition, as with the stamped product 1, as an example, the predetermined angle may be between 90° and 135°.

[0066] However, the preliminary longitudinal wall portion 3A and the preliminary transverse wall portion 4A are not adjacent to each other, and a plate-like portion, ie, a raised portion 7, is provided between the preliminary longitudinal wall portion 3A and the preliminary transverse wall portion 4A. In this respect, the intermediate formed product 1A is different from the press-formed product 1.

[0067] [(7) Raised part]

[0068] The raised portion 7 has a shape such that the portion around the collection portion 60 of the vertical wall portion 3, the horizontal wall portion 4, and the bottom wall portion 5 of the press-formed product 1 is raised toward the raised side (see Figure 3 ).

[0069] The raised portion 7 is located between the pre-longitudinal wall portion 3A and the pre-transverse wall portion 4A, and is adjacent to the above-mentioned portion, and the raised portion 7 is adjacent to the portion around the end portion of the pre-bottom wall portion 5A located on the side of the first end 10. The raised portion 7 is located at a position closer to the raised side than the first edge line 61, the third edge line 63, and the collection portion 60 in the stamped product 1. In addition, the raised portion 7 intersects with the pre-second edge line 62A at a position closer to the raised side than the collection portion 60 in the stamped product 1. In addition, the pre-second edge line 62A refers to the portion forming the boundary between the pre-transverse wall portion 4A and the pre-bottom wall portion 5A. In addition, the boundary between the raised portion 7 and the pre-transverse wall portion 4A is located at a position closer to the raised side than the third edge line 63 in the stamped product 1, and the boundary between the raised portion 7 and the pre-bottom wall portion 5A is located at a position closer to the raised side than the first edge line 61 in the stamped product 1. Furthermore, a preliminary first ridge line 61A is formed on the second end 11 side of the raised portion 7 , and the preliminary first ridge line 61A forms a boundary between the preliminary vertical wall portion 3A and the preliminary bottom wall portion 5A.

[0070] As an example, the raised portion 7 is in a planar shape, but the present invention is not limited thereto, and the raised portion 7 may be in a curved shape. In addition, as an example, the raised portion 7 is in a substantially quadrilateral shape when viewed from the front.

[0071] Here, the portion of the boundary between the raised portion 7 and the pre-transverse wall portion 4A that is located closest to the top plate portion 2 is defined as the vertex 71. The vertex 71 is located near the top plate portion 2. Specifically, the vertex 71 is located on the longitudinal end portion 20 of the top plate portion 2, but is not limited thereto, and the vertex 71 may also be disposed at a position spaced a certain distance from the longitudinal end portion 20.

[0072] Furthermore, an end portion (hereinafter referred to as a top end portion 70) of the raised portion 7 that forms an edge on the opposite side of the pre-bottom wall portion 5A extends along the longitudinal end portion 20 of the top plate portion 2. Specifically, the top end portion 70 is located on the longitudinal end portion 20, but is not limited thereto, and a certain distance may be provided between the top end portion 70 and the longitudinal end portion 20.

[0073] In addition, a gap may be provided between the top end portion 70 and the longitudinal end portion 20. Specifically, for example, the top end portion 70 may be provided around the pre-bottom wall portion 5A. That is, the pre-longitudinal wall portion 3A and the pre-transverse wall portion 4A may be adjacent to each other at a position adjacent to the top plate portion 2 side of the raised portion 7.

[0074] [2. Second embodiment]

[0075] The manufacturing method of the press-formed product 1 of the second embodiment is different from that of the first embodiment in the shape of the raised portion 7 in the intermediate formed product 1A (see Figure 4 ) Hereinafter, the differences between the intermediate molded product 1A of the second embodiment and the first embodiment will be described.

[0076] In the second embodiment, as in the first embodiment, the raised portion 7 has a shape such that the portion around the collection portion 60 in the longitudinal wall portion 3, the transverse wall portion 4, and the bottom wall portion 5 of the stamped product 1 is raised toward the above-mentioned raised side. That is, as in the first embodiment, the raised portion 7 is located at a position closer to the raised side than the first edge line 61, the third edge line 63, and the collection portion 60 in the stamped product 1. In addition, the raised portion 7 intersects with the pre-second edge line 62A at a position closer to the raised side than the collection portion 60 in the stamped product 1. In addition, the boundary between the raised portion 7 and the pre-transverse wall portion 4A is located at a position closer to the raised side than the third edge line 63 in the stamped product 1, and the boundary between the raised portion 7 and the pre-bottom wall portion 5A is located at a position closer to the raised side than the first edge line 61 in the stamped product 1.

[0077] However, in the second embodiment, as an example, when viewed from the front, the raised portion 7 is a roughly triangular portion, and similar to the first embodiment, the raised portion 7 is adjacent to the pre-longitudinal wall portion 3A and the pre-transverse wall portion 4A, and the raised portion 7 is adjacent to a portion around the end portion of the pre-bottom wall portion 5A located on the side of the first end 10.

[0078] Furthermore, in the second embodiment, the pre-longitudinal wall portion 3A and the pre-transverse wall portion 4A are adjacent to each other on the top plate portion 2 side of the raised portion 7, and the pre-third ridgeline 63A forming the boundary between the above-mentioned portions extends from the boundary between the longitudinal end portion 20 and the transverse end portion 21 to the pre-bottom wall portion 5A. Moreover, the portion forming the vertex in the raised portion 7 (hereinafter referred to as the vertex 71), in other words, the portion of the boundary between the raised portion 7 and the pre-transverse wall portion 4A located closest to the top plate portion 2 side is located at the end of the pre-third ridgeline 63A.

[0079] As an example, the vertex 71 is located around the collection portion 60 of the stamped product 1, in other words, around the pre-bottom wall portion 5A. However, the position of the vertex 71 can also be appropriately set, for example, the vertex 71 can be arranged near the top plate portion 2, that is, on the longitudinal end portion 20 or at a position separated from the longitudinal end portion 20 by a certain distance.

[0080] [3. Modifications]

[0081] In the first and second embodiments, the collection portion 60 of the stamped product 1 is configured as a point-shaped portion. However, the collection portion 60 may be a portion extending in a planar shape, and the collection portion 60 may be located at a position closer to the raised side than the intersection point (hereinafter referred to as the virtual intersection point) between each virtual line obtained by extending the first edge line 61 to the third edge line 63. In other words, the collection portion 60 may have the same shape as the shape formed by chamfering the point-shaped collection portion 60 in the first and second embodiments.

[0082] As an example, the collection portion 60 has the same shape as a shape formed by C-chamfering the portion where the first edge line 61 to the third edge line 63 intersect, and the collection portion 60 is formed as a portion having a substantially triangular planar shape (see Figure 5 The ends of the first to third ridgelines 61 to 63 are connected to the portions forming the vertices of the collection portion 60 , and the portions forming the edges of the collection portion 60 are adjacent to the vertical wall portion 3 , the horizontal wall portion 4 , and the bottom wall portion 5 .

[0083] In addition, the collection part 60 may have the same shape as the shape formed by performing R chamfering (round chamfering) on ​​the intersection of the first edge line 61 to the third edge line 63, and the collection part 60 may be formed as a curved surface. Furthermore, the ends of each of the first edge line 61 to the third edge line 63 may be connected to the collection part 60, respectively.

[0084] Furthermore, in the second step, when the press-formed product 1 is formed from the intermediate formed product 1A in the same manner as in the first and second embodiments, the raised portion 7 of the intermediate formed product 1A is pressed to form the collection portion 60. Therefore, the collection portion 60 is smaller than the raised portion 7, and the collection portion 60 is located closer to the virtual intersection side of the first ridgeline 61 to the third ridgeline 63 than the raised portion 7.

[0085] [4. Effect]

[0086] (1) When the stamped product 1 is formed from the blank B by a single stamping process, cracks may occur in the portion around the collection portion 60 (hereinafter referred to as the collection portion surrounding portion 64), and wrinkles may occur in the portion around the end portion of the second ridgeline 62 located on the opposite side of the collection portion 60 (hereinafter referred to as the outer end portion 65) (see Figure 1 ). The reason is that the collection part surrounding portion 64 of the stamped product 1 is a portion where three surfaces intersect, and the angle of intersection between the surfaces is steep. Therefore, during the stamping process, the movement of the material is easily restricted at the collection part surrounding portion 64, and the vicinity of the collection part 60 is a contact point, and the load is easily concentrated at the collection part surrounding portion 64. In addition, the contact point refers to a portion where a relatively large load is applied during the stamping process. For example, the portion that abuts against the mold in the initial stage of stamping sometimes becomes a contact point.

[0087] Here, in order to suppress cracks at the collection portion surrounding portion 64 of the stamped component 1, a method of reducing the load applied to the collection portion surrounding portion 64 during the stamping process can be considered. However, this cannot reduce the plate thickness of the collection portion surrounding portion 64, resulting in that the material accumulated at the outer end portion 65 may be difficult to move to the collection portion surrounding portion 64, so that wrinkles are easily generated at the outer end portion 65.

[0088] In this regard, in the manufacturing method of the above-mentioned embodiment, a raised portion 7 is formed on the intermediate formed product 1A, and the raised portion 7 is located around the position where the collection portion surrounding portion 64 is formed in the stamped product 1, and the raised portion 7 is used to make the angle between the surfaces intersecting each other gentle. Thus, first, in the stamping process of the first step, the position corresponding to the bottom point 72 of the intermediate formed product 1A in the blank B becomes the abutment point. In addition, the bottom point 72 refers to the intersection between the raised portion 7 and the pre-first edge line 61A. As a result, in the blank B in the stamping process of the first step, the position of the abutment point is easy to change, so that the load can be suppressed from being excessively concentrated on the portion around the bottom point 72, and the plate thickness of this portion can be appropriately reduced.

[0089] Furthermore, in the stamping process of the second step, a contact point is generated at the planar raised portion 7 in the intermediate formed product 1A, so that the position of the contact point can be changed, thereby suppressing load concentration. In addition, the portion around the bottom point 72 of the intermediate formed product 1A is reduced in thickness, so that the material can be moved from the outer end 65 to this portion. In addition, the area of ​​the raised portion 7 is smaller than the area of ​​the plate-shaped portion surrounded by the line corresponding to the outer edge 73 of the raised portion 7 in the stamped product 1 (hereinafter referred to as the covering portion 66) (refer to Figure 6 That is, during the press forming process of the second step, the cover portion 66 is formed due to the deformation of the raised portion 7, but since the area of ​​the cover portion 66 is larger than the area of ​​the raised portion 7, the thickness of the cover portion 66 is thinner than the thickness of the raised portion 7. Therefore, the material can be moved from the outer end portion 65 to the cover portion 66.

[0090] Thus, in the stamped product 1, the reduction in plate thickness of the portion around the position corresponding to the bottom point 72 and the portion around the collection portion 64, and the increase in plate thickness of the outer end portion 65 can be suppressed within the allowable range. As a result, cracks generated at the portion around the collection portion 64 and wrinkles generated at the outer end portion 65 in the stamped product 1 can be suppressed.

[0091] (2) In addition, in the first embodiment, the apex 71 of the raised portion 7 is located near the top plate portion 2, and the top end portion 70 of the raised portion 7 extends along the longitudinal end portion 20. Therefore, during the stamping process of the second step, the abutment point in the raised portion 7 of the intermediate formed product 1A can be further moved away from the position corresponding to the collection portion 60. As a result, the position of the abutment point can be further changed, and the load concentration can be appropriately suppressed. In addition, since the area of ​​the raised portion 7 can be fully ensured, the difference between the area of ​​the raised portion 7 and the area of ​​the covering portion 66 is large. Therefore, during the stamping process of the second step, the material can be moved from the outer end portion 65 to the covering portion 66. Thus, during the stamping process of the second step, cracks generated at the collection portion surrounding portion 64 and wrinkles generated at the outer end portion 65 in the stamped product 1 can be more appropriately suppressed.

[0092] (3) In addition, since the stamped product 1 of the above embodiment has a curved shape, if the stamped product 1 is formed from the blank B by a single stamping process, the load is more likely to be concentrated on the portion around the collection portion 64, resulting in cracks being easily generated at the portion around the collection portion 64 and wrinkles being easily generated at the outer end portion 65. In contrast, by providing the first step as in the above embodiment, the intermediate formed product 1A having the raised portion 7 is formed in the first step, and cracks generated at the portion around the collection portion 64 and wrinkles generated at the outer end portion 65 in the stamped product 1 can be effectively suppressed.

[0093] (4) In addition, the press-formed product 1 of the above embodiment is made of a high tensile strength steel material having a tensile strength of 980 MPa or more. Therefore, cracks are easily generated at the portion 64 around the collection portion, and wrinkles are easily generated at the outer end portion 65. In response to this, by providing the first step as in the above embodiment, the intermediate formed product 1A having the raised portion 7 is formed in the first step, and cracks generated at the portion 64 around the collection portion and wrinkles generated at the outer end portion 65 in the press-formed product 1 can be effectively suppressed.

[0094] [5. Other embodiments]

[0095] (1) In the above-described embodiment, the transverse wall portion 4 and the bottom wall portion 5 in the press-formed product 1 are both configured as elongated flange-shaped portions extending along the end portion of the longitudinal wall portion 3. However, the transverse wall portion 4 and the bottom wall portion 5 may not be flange-shaped portions, but may be portions extending in a planar shape from the end portion of the longitudinal wall portion 3.

[0096] (2) Multiple functions of one component in the above-mentioned embodiment may be realized by multiple components, or one function of one component in the above-mentioned embodiment may be realized by multiple components. In addition, multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. In addition, part of the structure of the above-mentioned embodiment may be omitted. At least part of the structure of the above-mentioned embodiment may be added to the structure of the above-mentioned other embodiment, or at least part of the structure of the above-mentioned embodiment may be replaced with the structure of the above-mentioned other embodiment.

[0097] [6. Technical ideas disclosed in this specification]

[0098] [Project 1]

[0099] A method for manufacturing a stamped product, characterized by comprising:

[0100] forming an intermediate molded product by press-forming a plate-shaped member; and

[0101] The intermediate formed product is formed by press forming.

[0102] The stamped product comprises:

[0103] A top plate portion, the top plate portion being a plate-shaped portion having a longitudinal end portion and a transverse end portion;

[0104] a longitudinal wall portion, the longitudinal wall portion being a plate-shaped portion extending from the longitudinal end portion of the top plate portion;

[0105] a transverse wall portion, the transverse wall portion being a plate-shaped portion extending from the transverse end portion of the top plate portion, and the transverse wall portion being adjacent to the longitudinal wall portion;

[0106] a bottom wall portion, the bottom wall portion being a plate-shaped portion adjacent to the vertical wall portion and the horizontal wall portion;

[0107] a first ridgeline, the first ridgeline forming a boundary between the vertical wall portion and the bottom wall portion;

[0108] a second ridgeline, the second ridgeline forming a boundary between the transverse wall portion and the bottom wall portion;

[0109] a third ridgeline, the third ridgeline forming a boundary between the transverse wall portion and the longitudinal wall portion; and

[0110] a collection portion, the collection portion being connected to respective ends of the first ridge line, the second ridge line, and the third ridge line,

[0111] The bottom wall portion protrudes from the first ridgeline toward the raised side, and the lateral wall portion protrudes from the third ridgeline toward the raised side.

[0112] The intermediate molded product comprises:

[0113] the top plate portion;

[0114] a pre-longitudinal wall portion, the pre-longitudinal wall portion being a plate-shaped portion extending from the longitudinal end portion of the top plate portion;

[0115] a pre-transverse wall portion, the pre-transverse wall portion being a plate-shaped portion extending from the transverse end portion of the top plate portion;

[0116] a preliminary bottom wall portion, the preliminary bottom wall portion being a plate-shaped portion adjacent to the preliminary longitudinal wall portion and the preliminary transverse wall portion; and

[0117] A raised portion, the raised portion being a plate-shaped portion adjacent to the pre-longitudinal wall portion, the pre-transverse wall portion, and the pre-bottom wall portion;

[0118] The raised portion is located at a position closer to the raised side than the first ridge line and the third ridge line, and intersects with the pre-second ridge line at a position closer to the raised side than the collection portion, and the pre-second ridge line forms a boundary between the pre-transverse wall portion and the pre-bottom wall portion.

[0119] The protrusion is deformed by press forming, thereby forming the press-formed product from the intermediate formed product.

[0120] [Project 2]

[0121] The method for manufacturing a press-formed product according to item 1 is characterized in that:

[0122] A portion of the raised portion located closest to the top plate portion in a boundary between the raised portion and the pre-lateral wall portion is defined as a vertex.

[0123] The apex is located near the top plate portion.

[0124] [Item 3]

[0125] The method for manufacturing a press-formed product according to item 1 or 2, characterized in that:

[0126] The raised portion has a top end portion, and the top end portion is an end portion located on the opposite side of the preliminary bottom wall portion.

[0127] The top end portion extends along an end portion of the top plate portion.

[0128] [Item 4]

[0129] The method for manufacturing a press-formed product according to any one of items 1 to 3, characterized in that:

[0130] The press-formed product is bent so that an end portion located in the direction of the first ridgeline protrudes toward a side opposite to the bottom wall portion.

[0131] [Item 5]

[0132] The method for manufacturing a press-formed product according to any one of items 1 to 4, characterized in that:

[0133] The stamped product is made of a high-tensile-strength steel material having a tensile strength of 980 MPa or more.

Claims

1. A method for manufacturing a stamped product, characterized in that: include: forming an intermediate molded product by press-forming a plate-shaped member; and The intermediate formed product is formed by press forming. The stamped product comprises: A top plate portion, the top plate portion being a plate-shaped portion having a longitudinal end portion and a transverse end portion; a longitudinal wall portion, the longitudinal wall portion being a plate-shaped portion extending from the longitudinal end portion of the top plate portion; a transverse wall portion, the transverse wall portion being a plate-shaped portion extending from the transverse end portion of the top plate portion, and the transverse wall portion being adjacent to the longitudinal wall portion; a bottom wall portion, the bottom wall portion being a plate-shaped portion adjacent to the vertical wall portion and the horizontal wall portion; a first ridgeline, the first ridgeline forming a boundary between the vertical wall portion and the bottom wall portion; a second ridgeline, the second ridgeline forming a boundary between the transverse wall portion and the bottom wall portion; a third ridgeline, the third ridgeline forming a boundary between the transverse wall portion and the longitudinal wall portion; and a collection portion, the collection portion being connected to respective ends of the first ridge line, the second ridge line, and the third ridge line, The bottom wall portion protrudes from the first ridgeline toward the raised side, and the lateral wall portion protrudes from the third ridgeline toward the raised side. The intermediate molded product comprises: the top plate portion; a pre-longitudinal wall portion, the pre-longitudinal wall portion being a plate-shaped portion extending from the longitudinal end portion of the top plate portion; a pre-transverse wall portion, the pre-transverse wall portion being a plate-shaped portion extending from the transverse end portion of the top plate portion; a preliminary bottom wall portion, the preliminary bottom wall portion being a plate-shaped portion adjacent to the preliminary longitudinal wall portion and the preliminary transverse wall portion; and A raised portion, the raised portion being a plate-shaped portion adjacent to the pre-longitudinal wall portion, the pre-transverse wall portion, and the pre-bottom wall portion; The raised portion is located at a position closer to the raised side than the first ridge line and the third ridge line, and intersects with the pre-second ridge line at a position closer to the raised side than the collection portion, and the pre-second ridge line forms a boundary between the pre-transverse wall portion and the pre-bottom wall portion. The protrusion is deformed by press forming, thereby forming the press-formed product from the intermediate formed product.

2. The method for manufacturing a press-formed product according to claim 1, wherein: A portion of the raised portion located closest to the top plate portion in a boundary between the raised portion and the pre-lateral wall portion is defined as a vertex. The apex is located near the top plate portion.

3. The method for manufacturing a press-formed product according to claim 1 or 2, characterized in that: The raised portion has a top end portion, and the top end portion is an end portion located on the opposite side of the preliminary bottom wall portion. The top end portion extends along an end portion of the top plate portion.

4. The method for manufacturing a press-formed product according to any one of claims 1 to 3, characterized in that: The press-formed product is bent so that an end portion located in the direction of the first ridgeline protrudes toward a side opposite to the bottom wall portion.

5. The method for manufacturing a press-formed product according to any one of claims 1 to 4, characterized in that: The stamped product is made of a high-tensile-strength steel material having a tensile strength of 980 MPa or more.

6. The method for manufacturing a press-formed product according to claim 5, characterized in that: The stamped product is made of a high-tensile-strength steel material having a tensile strength of 1470 MPa or more.

7. The method for manufacturing a press-formed product according to any one of claims 1 to 6, characterized in that: The gathering portion is a point-shaped portion.

8. The method for manufacturing a press-formed product according to any one of claims 1 to 6, characterized in that: The gathering portion is a surface-shaped portion.

9. The method for manufacturing a press-formed product according to any one of claims 1 to 8, characterized in that: The press-formed product is to be mounted on a vehicle.

10. The method for manufacturing a press-formed product according to claim 9, wherein: The press-formed product is a component constituting a part of a vehicle body.

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