Press die, and method for manufacturing press-formed products formed by the die.

Abstract

The upper die (30) of the press die (11) includes an upper die body (31) that is movable in the vertical direction, a first rotating die (40) whose first outer peripheral surface (40a) rotates relative to the first sliding surface (31a) of the upper die body (31) and is capable of bending the sheet metal (12) toward the first side surface (22), and a second rotating die (50) whose second outer peripheral surface (50a) rotates relative to the second sliding surface (31b) of the upper die body (31) and is capable of bending the sheet metal (12) toward the second side surface (25). The first rotating die (40) and the second rotating die (50) overlap in the longitudinal direction (L) of the press-formed product (60).

Description

Technical Field

[0001] The present invention relates to a press die having a rotating die.

Background Art

[0002] A press die for forming a press-formed product by bending both ends of a plate material by press working is disclosed in Patent Document 1.

[0003] This press die includes a lower die that supports a plate material, a pad that presses the plate material placed on the lower die, and an upper die that bends both ends of the plate material. The upper die includes an upper die body that is movable in the vertical direction, and a pair of rotating dies that are pushed by the upper die body to rotate and can bend the plate material.

[0004] When the upper die body descends, the pad presses the plate material placed on the lower die, and each rotating die rotates so as to approach the side surface of the lower die. Therefore, a load can be applied to the bent portion of the plate material. In this bending process of bending both ends of the plate material, springback, warpage, and camber (local warpage) can be suppressed as compared with the process in which a shearing load is applied to the vertical wall of the drawing process.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, in the press die of this Patent Document 1, a pair of rotating dies are arranged on both sides of the pad, and the width of the press die inevitably becomes a predetermined width. Therefore, among the bendings of both ends of the plate material, it is impossible to form a press-formed product having a narrow width, a substantially U-shaped or hat cross-sectional shape, which is used for a vehicle body frame or the like. There is room for improvement.

[0007] The present invention aims to provide a press die capable of forming press-formed products with a narrow, substantially U-shaped or hat-shaped cross-section, and a method for manufacturing press-formed products formed by the same die. [Means for solving the problem]

[0008] In this disclosure, In a press die comprising an upper die and a lower die, capable of obtaining a press-formed product by bending a sheet material, The lower mold has a support surface capable of supporting the plate material, a first side surface extending downward from one end of the support surface, and a second side surface extending downward from the opposite end of the support surface. The aforementioned upper mold is, An upper body that can move vertically, A first rotating mold in which the first outer surface rotates relative to the first sliding surface of the upper mold body, and the plate material can be bent toward the first side surface, The device comprises a second rotating mold whose second outer surface rotates relative to the second sliding surface of the upper mold body, thereby enabling the plate material to be bent toward the second side surface, A press die is provided in which the first rotary die and the second rotary die overlap in the longitudinal direction of the press-formed product.

[0009] Furthermore, in this disclosure, A method for manufacturing a press-formed product by bending a sheet metal using a press die comprising an upper die and a lower die, The lower mold has a support surface capable of supporting the plate material, a first side surface extending downward from one end of the support surface, and a second side surface extending downward from the opposite end of the support surface. The aforementioned upper mold is, An upper body that can move vertically, A first rotating mold in which the first outer surface rotates relative to the first sliding surface of the upper mold body, and the plate material can be bent toward the first side surface, A second rotatable type in which the second outer peripheral surface rotates with respect to the second sliding surface of the upper die body and the plate material can be bent toward the second side surface, is provided. A method for manufacturing a press-formed product is provided, in which the first rotatable type and the second rotatable type overlap in the length direction of the press-formed product.

Advantages of the Invention

[0010] The present invention can provide a press die capable of forming a press-formed product having a substantially U-shaped or hat cross-sectional shape with a narrow width, and a method for manufacturing a press-formed product manufactured by the die.

Brief Description of the Drawings

[0011] [Figure 1] It is a diagram for explaining a press machine equipped with the press die of Example 1. [Figure 2] It is a perspective view of the lower die of the press die in FIG. 1. [Figure 3] It is a schematic diagram of the state at the start of forming of the press die in FIG. 1. [Figure 4] It is a schematic diagram of the state during forming of the press die in FIG. 3. [Figure 5] It is a schematic diagram of the state at the completion of forming of the press die in FIG. 3. [Figure 6] It is a perspective view of a press-formed product formed by the press die in FIG. 1. [Figure 7] It is a view of the upper die seen from below. [Figure 8] It is a view of a part of the upper die seen from below. [Figure 9] It is a view of a part of the first rotatable type and the second rotatable type seen from above. [Figure 10] It is a sectional view taken along line 10-10 in FIG. 9. [Figure 11] [[ID=4​​​​​​​ [Figure 14] It is an exploded perspective view of the lower die of the press die of Example 3. [Figure 15] It is a view of the upper die of the press die of Example 3 seen from below.

Mode for Carrying Out the Invention

[0012] <Example> Examples will be described based on the attached drawings. Note that the examples described here are not intended to particularly limit the present invention. The elements constituting each example can be combined as appropriate. Also, members and parts having the same function are given the same reference numerals, and overlapping descriptions are omitted or simplified as appropriate. In the drawings, Fr indicates the front, Rr indicates the rear, Le indicates the left, Ri indicates the right, Up indicates the top, and Dn indicates the bottom. The front-rear direction is also the length direction L of the press-formed product 60 (see FIG. 6), and the left-right direction is also the width direction W of the press-formed product 60.

[0013] Refer to FIG. 1. A press die 11 of Example 1 for bending a plate material 12 (blank material) is fixed to a press 10. The press 10 includes a bolster 16 and a slide 17 that can move up and down with respect to the bolster 16.

[0014] The slide 17 is provided with a guide pillar 18 that protrudes downward. The bolster 16 is provided with a guide bush 19 having an inner peripheral surface on which the guide pillar 18 slides. The lower die 20 of the press die 11 is fixed to the bolster 16. The upper die 30 of the press die 11 is fixed to the slide 17.

[0015] (Lower die) Refer to FIG. 2. The lower die 20 has a support surface 21 capable of supporting the plate material 12, a first side surface 22 extending downward from the left end portion (one side end portion) of the support surface 21, a first bottom surface 23 extending leftward from the lower end portion of the first side surface 22, a second side surface 25 extending downward from the right end portion (opposite side end portion) of the support surface 21, and a second bottom surface 26 extending from the second side surface 25 to the side opposite to the first bottom surface 23.

[0016] (Width of the bottom mold) The width W1 between the first side 22 and the second side 25 of the lower mold 20 narrows as it goes downwards. However, the width W1 may remain constant.

[0017] (plate material) Of the plate material 12, the portion supported by the support surface 21 is designated as the intermediate portion 12a, the portion to the left (one side) of the intermediate portion 12a is designated as the first portion 12b, and the portion to the right (opposite side) of the first portion 12b is designated as the second portion 12c. The material of the plate material 12 is steel, but other materials such as aluminum alloy, which are materials used for parts that make up the vehicle body, can also be used.

[0018] (upper mold) Refer to Figure 3. The upper mold 30 is fixed to the slide 17 and comprises an upper mold body 31 that can move up and down together with the slide 17, a first rotating mold 40 that can rotate relative to the upper mold body 31, and a second rotating mold 50 that can rotate relative to the upper mold body 31.

[0019] (Upper body) The upper mold body 31 has a first sliding surface 31a on which the first outer peripheral surface 40a of the first rotating mold 40 slides, and a second sliding surface 31b on which the second outer peripheral surface 50a of the second rotating mold 50 slides.

[0020] (Pressing part) Refer to Figures 3 and 8. The first rotating mold 40 has a first pressing portion 41a that sandwiches the intermediate portion 12a of the plate material 12 together with the support surface 21 of the lower mold 20 and holds down the intermediate portion 12a.

[0021] The second rotating mold 50, together with the support surface 21 of the lower mold 20, has a second pressing portion 51a that clamps the intermediate portion 12a of the plate material 12 and holds down the intermediate portion 12a. With respect to the longitudinal direction L of the press-formed product 60, the second pressing portion 51a is in a different position from the first pressing portion 41a.

[0022] (Position of the pressing part) When the first rotating die 40 and the second rotating die 50 are in the position to begin forming, the first pressing portion 41a is located on the left side (towards the first rotating die 40) and the second pressing portion 51a is located on the right side (towards the second rotating die 50), with respect to the width direction W of the press-formed product 60. Alternatively, the first pressing portion 41a may be located on the right side and the second pressing portion 51a on the left side.

[0023] (Number of pressing points) Refer to Figure 7. The first rotating mold 40 has a first pressing portion 41a, as well as first pressing portions 41b to 41f. The six first pressing portions 41a to 41f are provided intermittently along the length L of the press-formed product 60. That is, each of the first pressing portions 41a to 41f partially presses the intermediate portion 12a along the length L. The six first pressing portions 41a to 41f are adjacent to the first top wall forming portions 45a to 45f, which will be described later.

[0024] The second rotating mold 50 has second pressing portions 51b to 51e in addition to the second pressing portion 51a. The five second pressing portions 51a to 51e are provided intermittently along the length L of the press-formed product 60. Each of the second pressing portions 51a to 51e partially presses the intermediate portion 12a along the length L. The five second pressing portions 51a to 51e are adjacent to the second top wall forming portions 55a to 55e, which will be described later.

[0025] The first pressing sections 41a to 41f and the second pressing sections 51a to 51e are arranged alternately along the length L of the press-formed product 60. That is, the first pressing sections 41a to 41f and the second pressing sections 51a to 51e are connected along the length L and press down on the intermediate section 12a. The lengths of the first pressing sections 41a to 41f and the second pressing sections 51a to 51e can be changed as appropriate. (Rotational type of rotation)

[0026] Refer to Figures 4 and 7. As the upper mold body 31 descends while the first pressing parts 41a to 41f are pressing down on the intermediate part 12a, the first pressing parts 41a to 41f slide slightly to the right (towards the second rotating mold 50) relative to the intermediate part 12a, and the first outer peripheral surface 40a slides against the first sliding surface 31a. As a result, the first rotating mold 40 rotates counterclockwise with the first pressing parts 41a to 41f as the pivot point.

[0027] As the upper mold body 31 descends while the second pressing parts 51a to 51e are pressing down on the intermediate part 12a, the second pressing parts 51a to 51e slide slightly to the left (towards the first rotating mold 40) relative to the intermediate part 12a, and the second outer peripheral surface 50a slides against the second sliding surface 31b. As a result, the second rotating mold 50 rotates clockwise with the second pressing parts 51a to 51e as the pivot point.

[0028] (Bending section) The first rotating mold 40 has a first bending portion 43 that, by rotating the first rotating mold 40, pushes the first portion 12b of the plate material 12 and bends the first portion 12b toward the first side surface 22. The first bending portion 43 is a single portion formed over the entire length L.

[0029] The second rotating mold 50 has a second bending portion 53 that, by rotating the second rotating mold 50, pushes the second portion 12c of the plate material 12 and bends the second portion 12c toward the second side surface 25. The second bending portion 53 is a single portion formed over the entire length L.

[0030] (Press-formed product) Refer to Figures 5 and 6. When the first part 12b of the plate material 12 comes into contact with the first side surface 22 of the lower die 20 (and at the same time, the second part 12c comes into contact with the second side surface 25), molding is completed and a press-formed product 60 can be obtained. The press-formed product 60 can be, for example, a component of the body frame of a four-wheeled automobile (a cross member extending in the width direction of the vehicle) or a cross member of a battery housing placed under the floor of an EV, but its application is not limited.

[0031] The press-formed product 60 has a roughly hat-shaped cross-section and includes a top wall portion 61 extending in the width direction (left-right direction), a first side wall portion 62 extending downward from the left end (one end) of the top wall portion 61, a first flange portion 63 extending to the left (one side) from the lower end of the first side wall portion 62, a second side wall portion 64 extending downward from the right end (opposite end) of the top wall portion 61, and a second flange portion 65 extending to the right (opposite side) from the lower end of the second side wall portion 64.

[0032] The press-formed product 60 may have a roughly hat-shaped cross-section, but may also be roughly U-shaped without the first flange portion 63 and the second flange portion 65.

[0033] (Side wall molding part) Refer to Figures 5 and 7. The first rotating mold 40 has a first side wall forming section 42 that can sandwich the plate material 12 together with the first side surface 22 of the lower mold 20 and form the first side wall 62. The first side wall forming section 42 is a single part that is formed over the entire length L of the first rotating mold 40.

[0034] The second rotating mold 50 has a second side wall forming section 52 that can sandwich the plate material 12 together with the second side surface 25 of the lower mold 20 and form the second side wall 64. The second side wall forming section 52 is a single part that extends over the entire length L of the second rotating mold 50.

[0035] (Flange forming section) The first rotating mold 40 has a first flange forming section 44 that can sandwich the plate material 12 together with the first bottom surface 23 of the lower mold 20 and form the first flange portion 63. The first flange forming section 44 is a single part formed over the entire length L of the first rotating mold 40. The first flange forming section 44 is optional.

[0036] The second rotating mold 50 has a second flange forming section 54 that can sandwich the plate material 12 together with the second bottom surface 26 of the lower mold 20 and form the second flange portion 65. The second flange forming section 54 is a single part formed over the entire length L of the second rotating mold 50. The second flange forming section 54 is optional.

[0037] (Ceiling wall molding part) Refer to Figures 5 and 11. The first rotating type 40 has a first top wall forming section 45a that can sandwich the plate material 12 together with the support surface 21 and partially form the top wall section 61.

[0038] The second rotating type 50 has a second top wall forming section 55a that can sandwich the plate material 12 together with the support surface 21 and partially form the top wall section 61.

[0039] (Number of top wall molding sections) Refer to Figure 7. The first rotary mold 40 has a first top wall forming section 45a, as well as first top wall forming sections 45b to 45f. The six first top wall forming sections 45a to 45f are provided intermittently along the length L. Each of the first top wall forming sections 45a to 45f partially forms the top wall section 61 of the press-formed product 60.

[0040] The second rotary mold 50 has second top wall forming sections 55b to 55e in addition to the second top wall forming section 55a. The five second top wall forming sections 55a to 55e are provided intermittently along the longitudinal direction L. Each of the second top wall forming sections 55a to 55e partially forms the top wall section 61 of the press-formed product 60.

[0041] (Arrangement of the top wall molding section) The six first top wall forming sections 45a to 45f and the five second top wall forming sections 55a to 55e are arranged alternately along the length L. In other words, the intermittently provided first top wall forming sections 45a to 45f and the intermittently provided second top wall forming sections 55a to 55e interlock with each other.

[0042] Refer to Figures 5 and 11. Once the molding of the press-formed product 60 is complete, the first top wall forming section 45a and the second top wall forming section 55a are aligned in the longitudinal direction L and are located on the same plane.

[0043] Refer to Figure 7. Similarly, the first top wall forming sections 45b to 45f and the second top wall forming sections 55b to 55e are aligned along the length L and are located on the same plane.

[0044] (Rotating cross-section) Refer to Figures 9 and 10. In cross-section C, which includes the first top wall forming section 45a of the first rotating mold 40, the first side wall forming section 42, the first pressing section 41a, and the second side wall forming section 52 of the second rotating mold 50 are included. The second pressing section 51a is not included. The same applies to cross-sections including the other first top wall forming sections 45b to 45f.

[0045] Although not shown in the diagram, the cross-section of the second rotating mold 50 including the second top wall forming section 55a includes the second side wall forming section 52, the second pressing section 51a, and the first side wall forming section 42 of the first rotating mold 40. The first pressing section 41a is not included. The same applies to the cross-sections including the other second top wall forming sections 55b to 55e.

[0046] (Return spring) The upper die 30 is equipped with a first elastic section 34 that applies force to the first rotating die 40 so that the first rotating die 40 rotates in the opposite direction (counterclockwise) to the bending direction of the plate material 12.

[0047] The first elastic portion 34 (for example, a gas spring) comprises a first main body portion 34a in which gas is sealed, and a first rod 34b that can advance relative to the first main body portion 34a by the pressure of the gas.

[0048] The first outer surface 40a has a first recessed portion 48 formed therein, which allows the first elastic portion 34 to be positioned. The wall surface of the first recessed portion 48 rotatably supports the tip portion 34c of the first rod 34b.

[0049] The first main body 34a is rotatably supported by the first support member 36. The first support member 36 is fixed to the slide 17.

[0050] The upper die 30 is equipped with a second elastic section 35 that applies force to the second rotating die 50 so that the second rotating die 50 rotates in the opposite direction to the bending direction of the plate material 12 (counterclockwise).

[0051] The second elastic portion 35 (for example, a gas spring) comprises a second main body portion 35a in which gas is sealed, and a second rod 35b that can advance relative to the second main body portion 35a by the pressure of the gas.

[0052] A second recessed portion 58 is formed on the second outer surface 50a, allowing for the placement of the second elastic portion 35. The wall surface of the second recessed portion 58 rotatably supports the tip portion 35c of the second rod 35b.

[0053] The second main body 35a is rotatably supported by the second support member 37. The second support member 37 is fixed to the slide 17. Note that other well-known components, such as compression coil springs, may be used as the first elastic portion 34 and the second elastic portion 35.

[0054] (Initial position of the rotating type) Refer to Figures 1 and 9. The first rotating type 40 has a first projection 49 that protrudes forward from its front end face. The second rotating type 50 has a second projection 59 that protrudes forward from its front end face. The same applies to the rear side. That is, the first rotating type 40 and the second rotating type 50 have portions that protrude in opposite directions from the outermost end faces on both sides in the longitudinal direction L of each.

[0055] After molding is complete, the upper die 30 rises and the first rotating die 40 separates from the press-formed product 60, at which point the first rod 34a extends and the first rotating die 40 rotates clockwise. The first projection 49 contacts the stopper 32 fixed to the upper die body 31, and the first rotating die 40 comes to a stop. The second rotating die 50 operates in the same manner.

[0056] (Retaining member) Refer to Figures 4, 8, and 9. The upper mold body 31 is equipped with a first holding member 47 that holds the first rotating mold 40 so that the first rotating mold 40 does not fall from the upper mold body 31.

[0057] The first retaining member 47 has a first retaining surface 47a that holds the first outer peripheral surface 40a of the first rotating mold 40. The first retaining surface 47a is smoothly connected to the first sliding surface 31a of the upper mold 30. There is no step at the boundary between the first sliding surface 31a and the first retaining surface 47a.

[0058] The upper mold body 31 is equipped with a second holding member 57 that holds the second rotating mold 50 so that the second rotating mold 50 does not fall from the upper mold body 31.

[0059] The second retaining member 57 has a second retaining surface 57a that holds the second outer peripheral surface 50a of the second rotating mold 50. The second retaining surface 57a is smoothly connected to the second sliding surface 31b of the upper mold 30. There is no step at the boundary between the second sliding surface 31b and the second retaining surface 57a.

[0060] The outer diameter of the first outer surface 40a is constant. Both the first sliding surface 31a and the first retaining surface 47a are in surface contact with the first outer surface 40a. That is, both the first sliding surface 31a and the first retaining surface 47a are curved surfaces with a constant inner diameter. The first sliding surface 31a and the first retaining surface 47a may also be flat. That is, the first outer surface 40a may be in line contact with the first sliding surface 31a and the first retaining surface 47a. The same applies to the second outer surface 50a, the second sliding surface 31b, and the second retaining surface 57a. Further explanation is omitted.

[0061] (Adjustment of the position of the retaining member) The first retaining member 47 is screw-fastened to the lower surface of the upper mold body 31. By loosening the screw, the position of the first retaining member 47 in the width direction (left-right direction) can be adjusted. The gap in the width direction between the upper mold body 31 and the first retaining member 47 can be adjusted with a thin plate-shaped first shim 38.

[0062] The second retaining member 57 is screw-fastened to the lower surface of the upper mold body 31. By loosening the screw, the position of the second retaining member 57 in the width direction (left-right direction) can be adjusted. The gap in the width direction between the upper mold body 31 and the second retaining member 57 can be adjusted with a thin plate-shaped second shim 39.

[0063] Refer to Figure 7. The upper mold body 31 is equipped with three first retaining members 47. The number of first retaining members 47 can be changed as appropriate. A single first retaining member 47 may be provided along the entire length L. Alternatively, no first retaining members 47 may be provided at all.

[0064] The upper mold 30 is equipped with three second retaining members 57. The number of second retaining members 57 can be changed as appropriate. A single second retaining member 57 may be provided along the entire length L. The second retaining members 57 may also be omitted.

[0065] (Restrictions on rotational rotation) Refer to Figure 5. The press die 11 includes a first restricting portion 13a that restricts the rotation of the first rotating die 40 so that the first rotating die 40 does not rotate further after the press-formed product 60 has been formed. The first restricting portion 13a includes a first receiving portion 24 formed on the lower die 20 and a first contact portion 46 formed on the first rotating die 40 that can contact the first receiving portion 24.

[0066] The position in which the first restricting portion 13a is provided is not limited, but for example, the first receiving portion 24 is a planar portion extending downward from the left end of the first bottom surface 23. The first contact portion 46 is a portion extending radially outward from the end of the first flange forming portion 44 and is formed over the entire length L of the first rotating mold 40.

[0067] The press die 11 includes a second restricting portion 13b that restricts the rotation of the second rotating die 50 so that it does not rotate further after the press-formed product 60 has been formed. The second restricting portion 13b includes a second receiving portion 27 formed on the lower die 20 and a second contact portion 56 formed on the second rotating die 50 that can contact the second receiving portion 27.

[0068] The position of the second restricting portion 13b is not limited, but for example, the second receiving portion 27 is a planar portion extending downward from the left end of the second bottom surface 26. The second contact portion 56 is a portion extending radially outward from the end of the second flange portion 65 and is formed over the entire length L of the second rotating type 50.

[0069] <Example 2> Refer to Figure 12. The press die 11A of Example 2 will now be described. The width of the first side surface 22A and the second side surface 25A of the lower die 20A increases towards the center in the length direction L. Specifically, the width W3 of the central part 28 of the lower die 20A is wider than the width W4 of the end surface 29 (W3 > W4).

[0070] The gap between the first side wall forming section 42A of the first rotating mold 40A of the upper mold 30A and the second side wall forming section 52A of the second rotating mold 50A (as shown in Figure 5, the gap when the upper mold 30 is closed) also widens as it approaches the center in the longitudinal direction L.

[0071] Refer to Figure 13. A press-formed product 60A formed by a press die 11A is shown. The widths of the first side wall portion 62A and the second side wall portion 64A of the press-formed product 60A increase towards the center in the longitudinal direction L. Specifically, the width W5 of the central portion 68 of the press-formed product 60A is wider than the width W6 of the end portion 69 (W5 > W6).

[0072] <Example 3> (lower mold) Refer to Figure 14. The lower die 70 of the press die 11B of Example 3 is shown. The lower die 70 is composed of a plurality (for example, four) of members 71 to 74 connected in the longitudinal direction L.

[0073] Two end faces 72a and 73a facing each other in the longitudinal direction L have a convex portion 73b and a concave portion 72b formed thereon that fit together. The other members 71 and 74 are similar. The lengths of each of the members 71 to 74 may be equal or different. Furthermore, as shown in Figure 12, the thicknesses of each of the members 71 to 74 may be different.

[0074] Refer to Figure 15. The upper mold body 76 is composed of multiple (for example, three) members 77-79 (front body member 77, intermediate body member 78, and rear body member 79) connected in the longitudinal direction L. The connection method is the same as that of the lower mold 70. The boundary between the front body member 77 and the intermediate body member 78 is defined as the first boundary 91. The boundary between the intermediate body member 78 and the rear body member 79 is defined as the second boundary 92.

[0075] There are four first retaining members 47. One of the four, the second retaining member 47, is screw-fastened to the front main body member 77 and also screw-fastened to the intermediate main body member 78. That is, the second retaining member 47 overlaps the first boundary 91.

[0076] There are four second retaining members 57. One of the four second retaining members 57 is screw-fastened to the intermediate main body member 78 and also screw-fastened to the rear main body member 79. In other words, one retaining member 57 overlaps the second boundary.

[0077] The first rotating type 81 is constructed by connecting multiple (for example, three) members 82-84 (first front member 82, first intermediate member 83, first rear member 84) along the length L. The connection method is the same as that of the lower type 70.

[0078] The boundary between the first front member 82 and the first intermediate member 83 is defined as the third boundary 93. The third boundary 93 is located in the first top wall forming section 81a of the first rotating mold 81. That is, the first top wall forming section 81a is composed of both the first front member 82 and the first intermediate member 83.

[0079] The boundary between the first intermediate member 83 and the first rear member 84 is defined as the fourth boundary 94. The fourth boundary 94 is located in the first top wall forming section 81b of the first rotating mold 81. That is, the first top wall forming section 81b is composed of both the first intermediate member 83 and the first intermediate member 83.

[0080] The second rotating type 85 is constructed by connecting multiple (for example, three) members 86-88 (second front member 86, second intermediate member 87, second rear member 88) along the length L. The connection method is the same as that of the lower type 70 (see Figure 14).

[0081] The boundary between the second front member 86 and the second intermediate member 87 is defined as the fifth boundary 95. The fifth boundary 95 is located in the second top wall forming section 85a of the second rotating mold 85. That is, the second top wall forming section 85a is composed of both the second front member 86 and the second intermediate member 87.

[0082] The boundary between the first intermediate member 83 and the second intermediate member 83 is defined as the sixth boundary 96. The sixth boundary 96 is located in the second top wall forming section 85b of the second rotating mold 85. That is, the second top wall forming section 85b is composed of both the second intermediate member 87 and the second rear member 88.

[0083] (Boundary location) With respect to the length direction L, the first boundary 91, the third boundary 93, and the fifth boundary 95 are in different positions from each other. With respect to the length direction L, the second boundary 92, the fourth boundary 94, and the fifth boundary 95 are in different positions from each other.

[0084] In Embodiment 3, all four components—the lower mold 70, the upper mold body 76, the first rotating mold 81, and the second rotating mold 85—are composed of multiple members. However, at least one of the four components may be composed of multiple members.

[0085] (Effects of the example) Refer to Figures 3 to 5. Firstly, A press die 11 comprising an upper die 30 and a lower die 20, capable of obtaining a press-formed product 60 by bending a sheet material 12, The lower mold 20 has a support surface 21 capable of supporting the plate material 12, a first side surface 22 extending downward from one end of the support surface 21, and a second side surface 25 extending downward from the opposite end of the support surface 21. The upper model 30 is, An upper body 31 that can move in the vertical direction, A first rotating mold 40 in which the first outer peripheral surface 40a rotates relative to the first sliding surface 31a of the upper mold body 31, and the plate material 12 can be bent toward the first side surface 22, The second rotating mold 50 is provided, in which the second outer peripheral surface 50a rotates relative to the second sliding surface 31b of the upper mold body 31, and the plate material 12 is bent toward the second side surface 25. A press die 11 is provided in which the first rotating die 40 and the second rotating die 50 overlap in the longitudinal direction L of the press-formed product 60.

[0086] In the press die 11, the first rotating die 40 and the second rotating die 50 overlap in the longitudinal direction L of the press-formed product 60. Therefore, the first pressing portions 41a to 41f of the first rotating die 40 and the second pressing portions 51a to 51e of the second rotating die 50 act as pads, eliminating the need for pads found in prior art press dies, and enabling the production of a press-formed product 60 with a narrow, approximately U-shaped or hat-shaped cross-section. Thus, a press die 11 capable of forming a narrow, approximately U-shaped or hat-shaped press-formed product 60 can be provided.

[0087] Furthermore, the first rotating type 40 and the second rotating type 50 bend the plate material 12 at the shoulder portion of the lower die 20 (the corner formed by the support surface 21 and the first side surface 22 and the second side surface 25), thus suppressing springback, warping, and buckling of the press-formed product 60.

[0088] Refer to Figures 5, 7, and 11. Secondly, in the press die 11 described in the first, The first rotating type 40 has six first top wall forming sections 45a to 45f that sandwich the plate material 12 together with the support surface 21. The second rotating type 50 has five second top wall forming sections 55b to 55e that sandwich the plate material 12 together with the support surface 21, The first top wall forming sections 45a to 45f and the second top wall forming sections 55b to 55e are arranged alternately along the length direction L.

[0089] The top wall portion 61 (the top plate portion with a U-shape or hat-shaped cross-section) of the press-formed product 60 is formed continuously along the length L by both the first top wall forming portions 45a to 45f and the second top wall forming portions 55b to 55e, which are arranged alternately along the length L.

[0090] Furthermore, as long as the first top wall molding section and the second top wall molding section as a whole form the top wall section 61, at least one of each is sufficient.

[0091] Refer to Figures 7, 9, and 10. Thirdly, in the press die 11 described in Section 2, The first rotation type 40 is, A first side wall forming section 42 is formed along the entire length L and, together with the first side surface 22 of the lower mold 20, sandwiches the plate material 12, The first rotating mold 40 holds down the plate material 12 placed on the support surface 21, drives the rotation of the first rotating mold 40, and has first pressing parts 41a to 41f adjacent to the first top wall forming parts 45a to 45f, The second rotation type 50 is, A second side wall forming section 52 is formed along the entire length L and, together with the second side surface 25 of the lower mold 20, sandwiches the plate material 12. The plate material 12 placed on the support surface 21 is held down, the rotation of the second rotating mold 50 is driven, and the second pressing parts 51a to 51e are adjacent to the second top wall forming parts 55a to 55e, In the cross-section including the first top wall forming section 45a, the first side wall forming section 42, the first pressing section 41a, and the second side wall forming section 52 are included. The cross-section including the second top wall forming section 55a includes the second side wall forming section 52, the second pressing section 51a, and the first side wall forming section 42.

[0092] A press-formed product 60 with a U-shaped or hat-shaped cross-section can be pressed continuously along the length L by the first rotating die 40 and the second rotating die 50, improving surface accuracy. Moreover, the upper die 30 can be constructed compactly.

[0093] Refer to Figure 4. Fourth, in the press die 11 described in any of the first to third, To prevent the first rotating mold 40 from falling from the upper mold body 31, a first holding member 47 has a first holding surface 47a that holds the first outer peripheral surface 40a of the first rotating mold 40, The device includes a second holding member 57 having a second holding surface 57a that holds the second outer peripheral surface 50a of the second rotating mold 50, so that the second rotating mold 50 does not fall from the upper mold body 31.

[0094] The first retaining member 47 prevents the first rotating mold 40 from falling. Furthermore, the portion held by the first retaining surface 47a of the first retaining member 47 is the first outer peripheral surface 40a of the first rotating mold 40. Therefore, during molding, in addition to the first sliding surface 31a, the first retaining surface 47a also pushes (supports) the first rotating mold 40, so that a force can be reliably applied perpendicular to the first part 12b of the sheet metal 12. This allows the sheet metal 12 to be bent more reliably. Note that a rotation mechanism may be added so that the first rotating mold 40 can rotate freely. Specifically, a roller bearing mechanism or the like may be added to the first rotating mold 40 or the upper mold body 31 to reduce friction. The second rotating mold 50 and the second retaining member 57 have similar effects.

[0095] Fifth, in the press die 11 described in fourth, The first sliding surface 31a of the upper mold body 31 and the first retaining surface 47a of the first retaining member 47 are smoothly connected. The second sliding surface 31b of the upper mold body 31 and the second holding surface 57a of the first holding member 47 are smoothly connected.

[0096] The first retaining surface 47a is smoothly connected to the first sliding surface 31a without any steps. As a result, the first retaining surface 47a can more securely hold the rotating type, and force can be reliably applied perpendicular to the wall surface of the plate material 12. The same applies to the second retaining surface 57a and the second sliding surface 31b.

[0097] Refer to Figures 5 and 6. Sixth, in the press die 11 described in third, The cross-section of the press-formed product 60 will be hat-shaped. The lower mold 20 has a first bottom surface 23 extending laterally from the first side surface 22, and a second bottom surface 26 extending from the second side surface 25 to the opposite side from the first bottom surface 23. The first rotating mold 40 extends laterally from the first side wall forming section 42 and has a first flange forming section 44 that sandwiches the plate material 12 together with the first bottom surface 23. The second rotating mold 50 extends laterally from the second side wall forming section 52 and includes a second flange forming section 54 that, together with the second bottom surface 26, sandwiches the plate material 12.

[0098] Flanges are formed at each end of the press-formed product 60, and the cross-section of the press-formed product 60 is hat-shaped.

[0099] Refer to Figure 5. Seventh, in the press die 11 described in any of the first to sixth, After the press-formed product 60 is formed, the first rotating die 40 and the second rotating die 50 are prevented from rotating further. The first rotating mold 40 has a first contact portion 46 that contacts the lower mold 20, The second rotating mold 50 has a second contact portion 56 that contacts the lower mold 20.

[0100] The lower mold 20 and each contact point act as end blocks, suppressing excessive bending force from acting on the sides.

[0101] Refer to Figure 9. Eighth, in the press die 11 described in any of the first to seventh, The first elastic part 34 applies force to the first rotating part 40 so that the first rotating part 40 rotates in the opposite direction to the bending direction of the plate material 12, The device includes a second elastic part 35 that applies force to the second rotating part 50 so that it rotates in the opposite direction to the bending direction of the plate material 12, thereby causing the second rotating part 50 to rotate in the opposite direction.

[0102] When the upper die 30 is raised and the first rotating die 40 separates from the press-formed product 60, the restoring force of the first elastic part 34 causes the first rotating die 40 to rotate in the opposite direction to the bending direction of the sheet metal 12, returning the first rotating die 40 to its initial position. The second elastic part 35 has a similar effect.

[0103] Refer to Figure 15. Ninth, in the press die 11B described in any of the first to eighth, The first rotating type 81 is composed of a plurality of first members 82 to 84 connected in the longitudinal direction L, The second rotating type 50 is composed of a plurality of second members 86 to 88 connected in the longitudinal direction L.

[0104] The first rotating mold 81 is composed of a plurality of first members 82 to 84 connected in the longitudinal direction L, and each individual member is miniaturized, making it easier to manufacture. In particular, when the press-formed product 60 is long, it is necessary to suppress the opening of the first side wall portion 62 and the second side wall portion 64 due to springback, and it becomes easier to adjust the force that bends the plate material 12 according to the position in the longitudinal direction L.

[0105] Refer to Figure 5. Specifically, as shown in the press die 11 of Embodiment 1, the gap in the width direction between the upper die body 31 and the first holding member 47 can be adjusted with a thin plate-shaped first shim 38 so that, for example, the position of the first holding member 47 in the width direction (left-right direction) can be adjusted. By placing the first shim 38, the first holding member 47 can be brought closer to the first rotating die 40, and the pressing force perpendicular to the first side wall portion 62 can be increased. Although not shown in the figures, a shim may also be placed between the first sliding surface 31a and the first outer peripheral surface 40a. The second holding member 57 has a similar effect. These configurations may also be adopted in the press die 11B of Embodiment 3.

[0106] Refer to Figures 12 and 13. In the tenth, in the press die 11A described in the third, The distance between the first side wall forming section 42A of the first rotary mold 40A and the second side wall forming section 52A of the second rotary mold 50A, and the width between the first side surface 22A and the second side surface 25A of the lower mold 20A are, The width of the cross-section of the press-formed product 60A differs depending on the position L in the length direction. It is set.

[0107] As an example, let's consider the case where the width W5 of the central part 68 of the press-formed product 60A is wider than the width W6 of the end part 69 (W5 > W6). The widths of the first side surface 22A and the second side surface 25A of the lower die 20A are set to widen towards the center in the length direction L. The distance between the first side wall forming part 42A of the first rotating die 40A of the upper die 30A and the second side wall forming part 52A of the second rotating die 50A (the distance when the upper die 30 is closed, as shown in Figure 5) is also set to widen towards the center in the length direction L. This is not limited to this example; the settings of the press die 11A should be changed according to the width of the cross-section of the press-formed product 60A.

[0108] Refer to Figure 2. Eleventh, in the press die 11A described in the first to tenth, The width W1 between the first side 22 and the second side 25 of the lower mold 20 narrows as it goes downwards.

[0109] Due to the springback of the press-formed product 60, it is possible to obtain a press-formed product 60 in which the top wall portion 61 and the side wall portion of the press-formed product 60 are perpendicular to each other.

[0110] Refer to Figures 3 to 5. Twelfth, A method for manufacturing a press-formed product 60 by bending a sheet metal 12 using a press die 11 comprising an upper die 30 and a lower die 20, The lower mold 20 has a support surface 21 capable of supporting the plate material 12, a first side surface 22 extending downward from one end of the support surface 21, and a second side surface 25 extending downward from the opposite end of the support surface 21. The upper model 30 is, An upper body 31 that can move in the vertical direction, A first rotating mold 40 in which the first outer peripheral surface 40a rotates relative to the first sliding surface 31a of the upper mold body 31, and the plate material 12 can be bent toward the first side surface 22, The second rotating mold 50 is provided, in which the second outer peripheral surface 50a rotates relative to the second sliding surface 31b of the upper mold body 31, and the plate material 12 is bent toward the second side surface 25. A method for manufacturing a press-formed product 60 is provided, wherein the first rotating mold 40 and the second rotating mold 50 overlap in the longitudinal direction L.

[0111] Therefore, a press die 11 capable of forming a press-formed product 60 with a narrow width and a roughly U-shaped or hat-shaped cross-section can be provided. [Explanation of Symbols]

[0112] 10… Press machine 11, 11A, 11B… Press dies 12...Plate material 20,20A…lower mold 21…Support surface 22,22A…1st side 23…1st bottom surface 25,25A…Second side 26…Second bottom surface 30…Upper mold 31...upper mold body, 31a...first sliding surface, 31b...second sliding surface 34…First elastic section 35...Second elastic section 40, 40A...First rotation type, 40a...First outer surface 41a~41f...First pressing section 42,42A…First side wall molding part 44…First flange forming section 45a~45f…First ceiling wall molding part 46...1st contact part 47...First retaining member, 47a...First retaining surface 50, 50A...Second rotation type, 50a...Second outer surface 51a~51e...Second pressing section 52,52A…Second side wall molding part 54…Second flange forming section 55a~55e…Second ceiling wall molding part 56…Second contact part 57...Second retaining member, 57a...Second retaining surface 60, 60A… Press-formed product 61... Top wall section 62...First side wall section 63...First flange section 64...Second side wall section 65...Second flange section 70…Lower mold 76... Upper body 81...First rotation type 82-84...Multiple first components 85...Second rotation type 86-88...Multiple second components L...Length direction W1...Width of the side of the lower mold W3, W4... Spacing between the side wall molding sections of the upper mold. W5, W6...Width of the cross-section of the press-formed product

Claims

1. In a press die comprising an upper die and a lower die, capable of obtaining a press-formed product by bending a sheet material, The lower mold has a support surface capable of supporting the plate material, a first side surface extending downward from one end of the support surface, and a second side surface extending downward from the opposite end of the support surface. The aforementioned upper mold is, An upper body that can move vertically, A first rotating mold in which the first outer surface rotates relative to the first sliding surface of the upper mold body, and the plate material can be bent toward the first side surface, The device comprises a second rotating mold whose second outer surface rotates relative to the second sliding surface of the upper mold body, thereby enabling the plate material to be bent toward the second side surface, A press die in which the first rotating die and the second rotating die overlap in the longitudinal direction.

2. The first rotating type has at least one first top wall forming portion that sandwiches the plate material together with the support surface, The second rotating type has at least one second top wall forming portion that sandwiches the plate material together with the support surface, The first top wall forming section and the second top wall forming section are arranged alternately along the length direction of the press-formed product. The press die according to claim 1.

3. The first rotational type is, A first side wall forming portion is formed along the entire length and sandwiches the plate material together with the first side surface of the lower mold, The first pressing portion is adjacent to the first top wall forming portion and holds down the plate material placed on the support surface, drives the rotation of the first rotary type, The second rotary type is, A second side wall forming portion is formed along the entire length and sandwiches the plate material together with the second side surface of the lower mold, The plate material placed on the support surface is held down, the rotation of the second rotary type is driven, and the second pressing part is adjacent to the second top wall forming part, In the cross-section including the first top wall forming portion, the first side wall forming portion, the first pressing portion, and the second side wall forming portion are included. In the cross-section including the second top wall forming portion, the second side wall forming portion, the second pressing portion, and the first side wall forming portion are included. The press die according to claim 2.

4. To prevent the first rotating mold from falling from the upper mold body, a first holding member having a first holding surface that holds the first outer surface of the first rotating mold, The system includes a second retaining member having a second retaining surface that holds the second outer surface of the second rotating mold, so as to prevent the second rotating mold from falling from the upper mold body, The press die according to claim 1.

5. The first sliding surface of the upper mold body and the first holding surface of the first holding member are smoothly connected. The second sliding surface of the upper mold body and the second holding surface of the first holding member are smoothly connected. The press die according to claim 4.

6. The cross-section of the aforementioned press-formed product is hat-shaped, The lower mold has a first bottom surface extending laterally from the first side surface and a second bottom surface extending from the second side surface to the opposite side of the first bottom surface. The first rotating mold extends laterally from the first side wall forming portion and has a first flange forming portion that sandwiches the plate material together with the first bottom surface. The second rotating mold extends laterally from the second side wall forming portion and includes a second flange forming portion that, together with the second bottom surface, sandwiches the plate material. The press die according to claim 3.

7. After the press-formed product is formed, the first and second rotary molds are prevented from rotating further. The first rotating mold has a first contact portion that contacts the lower mold, The second rotating mold has a second contact portion that contacts the lower mold. The press die according to claim 1.

8. A first elastic part applies force to the first rotating mold so that the first rotating mold rotates in the opposite direction to the bending direction of the plate material, The system includes a second elastic part that applies force to the second rotating mold so that the second rotating mold rotates in the opposite direction to the bending direction of the plate material, The press die according to claim 1.

9. The first rotating type is composed of a plurality of first members connected in the longitudinal direction, The second rotating type is composed of a plurality of second members connected in the longitudinal direction. The press die according to claim 1.

10. The distance between the first sidewall forming portion of the first rotary mold and the second sidewall forming portion of the second rotary mold, and the width between the first side surface and the second side surface of the lower mold are, The width of the cross-section of the aforementioned press-formed product differs depending on the position in the longitudinal direction. It is set The press die according to claim 3.

11. The width between the first and second sides of the lower mold narrows as it goes downwards. The press die according to claim 1.

12. A method for manufacturing a press-formed product by bending a sheet metal using a press die comprising an upper die and a lower die, The lower mold has a support surface capable of supporting the plate material, a first side surface extending downward from one end of the support surface, and a second side surface extending downward from the opposite end of the support surface. The aforementioned upper mold is, An upper body that can move vertically, A first rotating mold in which the first outer surface rotates relative to the first sliding surface of the upper mold body, and the plate material can be bent toward the first side surface, The device comprises a second rotating mold whose second outer surface rotates relative to the second sliding surface of the upper mold body, thereby enabling the plate material to be bent toward the second side surface, A method for manufacturing a press-formed product, wherein the first rotating mold and the second rotating mold overlap in the longitudinal direction of the press-formed product.

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