Press die

Abstract

To provide a press die that can be suppressed from deteriorating in molding accuracy.SOLUTION: A press die 10 comprises a fixed die 20 and a movable die 30 configured to move back and forth with respect to the fixed die 20, which press-molds a metallic plate material M. The fixed die 20 comprises a fixing-side molding part 27 having a first molding surface 27a and a plurality of fixing-side support blocks 25 supporting the fixing-side molding part 27. The movable die 30 comprises a movable-side molding part 37 having a second molding surface 37a and a plurality of movable-side support blocks 35 supporting the movable-side molding part 37. Young's modulus of the fixing-side support block 25 of the plurality of fixing-side support blocks 25 becomes larger as going toward a central part of the first molding surface 27a in a plane direction. Young's modulus of the movable-side support block 35 of the plurality of movable-side support blocks 35 becomes larger as going toward a central part of the second molding surface 37a in the plane direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a press die. [Background technology]

[0002] Patent Document 1 discloses a press die having a lower die and an upper die for press-forming a plate material. The forming surfaces of the lower die and the upper die are composed of a plurality of divided segments. Each segment of the lower die and the upper die is supported on a base via a shim. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-131344 Summary of the Invention [Problem to be solved by the invention]

[0004] In press dies including the press die described in Patent Document 1, the central portion of the forming surface is more likely to deform than the peripheral portion due to the pressure during press forming. In this case, the press pressure is insufficient at the center of the object to be formed, and the press pressure acting on the object tends to become uneven. As a result, the forming accuracy of the press die may decrease. [Means for solving the problem]

[0005] A press die for solving the above problem is a press die for press-forming metal sheet material, comprising a fixed die and a movable die configured to be able to advance and retreat relative to the fixed die, wherein the fixed die comprises a fixed side molding portion having a first molding surface, and a plurality of fixed side support blocks made of metal, arranged side by side in a planar direction perpendicular to the advance and retreat direction of the movable die and supporting the fixed side molding portion from the opposite side to the first molding surface in the advance and retreat direction; the movable die comprises a movable side molding portion having a second molding surface opposite the first molding surface, and a plurality of movable side support blocks made of metal, arranged side by side in the planar direction and supporting the movable side molding portion from the opposite side to the second molding surface in the advance and retreat direction; among the plurality of fixed side support blocks, the fixed side support blocks closer to the center of the first molding surface in the planar direction have a larger Young's modulus, and among the plurality of movable side support blocks, the movable side support blocks closer to the center of the second molding surface in the planar direction have a larger Young's modulus.

[0006] According to the above configuration, among the multiple fixed-side support blocks, the fixed-side support blocks closer to the center of the first forming surface in the surface direction have a larger Young's modulus, i.e., higher rigidity. Therefore, during press forming of the metal sheet, the fixed-side support blocks closer to the center of the first forming surface in the surface direction are less likely to deform in the advancing / retracting direction. As a result, the portion of the fixed-side forming part closer to the center of the first forming surface is less likely to deform in the advancing / retracting direction.

[0007] Similarly, during press forming of a metal plate, the closer the movable support block is to the center of the second forming surface in the surface direction, the less likely it is to deform in the advancing / retracting direction. As a result, the closer the movable forming part is to the center of the second forming surface, the less likely it is to deform in the advancing / retracting direction.

[0008] As a result, it is possible to prevent the press pressure from being insufficient at the center of the metal plate, thereby preventing the press pressure from being unevenly applied to the metal plate, and therefore to prevent a decrease in the forming accuracy of the press die. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a plan view of a separator for a fuel cell manufactured by a press die according to one embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. [Figure 3] FIG. 3 is a cross-sectional view showing a press die according to one embodiment. [Figure 4] FIG. 4 is a plan view showing the fixed side support block of FIG. [Figure 5] FIG. 5 is a plan view showing the positional relationship between the fixed-side support block and the first molding surface in FIG. [Figure 6] FIG. 6 is a plan view showing the positional relationship between the movable support block and the second molding surface in FIG. [Figure 7] FIG. 7 is a plan view showing the positional relationship between the fixed-side support block and the first molding surface of the first modified example. [Figure 8] FIG. 8 is a plan view showing the positional relationship between the fixed-side support block and the first molding surface of the second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, one embodiment of the press die will be described with reference to FIGS. The press die 10 is used to press-form a metal plate M to manufacture a separator 100 for a fuel cell.

[0011] First, the configuration of the separator 100 will be described. (Separator 100) As shown in FIG. 1, the separator 100 has a rectangular plate shape having long and short sides.

[0012] Hereinafter, the long side direction of the separator 100 will be referred to as the first direction X, and the direction perpendicular to both the first direction X and the thickness direction of the separator 100 will be referred to as the second direction Y. The second direction Y coincides with the short side direction of the separator 100.

[0013] The separator 100 is made of a metal material such as stainless steel or titanium. Three manifolds 101 for supplying or discharging a fluid are provided at each end of the separator 100 in the first direction X. Each manifold 101 penetrates the separator 100 in the thickness direction. The fluid is, for example, any one of a fuel gas such as hydrogen, an oxidant gas such as air, and cooling water.

[0014] 2, a plurality of groove-shaped flow paths 102 through which a fluid flows are provided on both sides of the separator 100 in the plate thickness direction. The flow paths 102 are arranged in parallel in the second direction Y. The flow paths 102 have the function of causing a fluid to flow from a manifold 101 at one end of the separator 100 in the first direction X to a manifold 101 at the other end.

[0015] Between two adjacent flow paths 102, ribs 103 are provided that extend along the flow paths 102 and divide the flow paths 102. The flow paths 102 provided on one surface of the separator 100 function as ribs 103 on the other surface of the separator 100. The ribs 103 that divide the flow paths 102 on one surface of the separator 100 function as flow paths 102 on the other surface of the separator 100.

[0016] (Press mold 10) 3, the press die 10 includes a fixed die 20 and a movable die 30 configured to be movable toward and away from the fixed die 20. The press die 10 presses a metal plate material M, which is the base material of the separator 100, using the fixed die 20 and the movable die 30 to form a plurality of flow paths 102 on the surface of the metal plate material M.

[0017] Hereinafter, the surface direction perpendicular to the direction in which the movable mold 30 advances and retreats relative to the fixed mold 20 will be simply referred to as the surface direction. (Fixed type 20) The fixed mold 20 includes a fixed-side support base 21, a fixed-side die set 22, and a fixed-side backing plate 23. The fixed-side die set 22 is fixed to the upper surface of the fixed-side support base 21. The fixed-side backing plate 23 is fixed to the upper surface of the fixed-side die set 22. The fixed-side support base 21, the fixed-side die set 22, and the fixed-side backing plate 23 are made of metal.

[0018] The fixed mold 20 includes a fixed-side holding plate 24, a plurality of fixed-side support blocks 25, a plurality of shims 26, and a fixed-side molding portion 27. The fixed-side holding plate 24 is fixed to the upper surface of the fixed-side backing plate 23. The fixed-side holding plate 24 has holding holes 24a that penetrate in the vertical direction. Each of the fixed-side support blocks 25, each of the shims 26, and the fixed-side molding portion 27 is held inside the holding holes 24a. The fixed-side holding plate 24, each of the fixed-side support blocks 25, each of the shims 26, and the fixed-side molding portion 27 are made of metal.

[0019] The fixed-side molding section 27 has a first molding surface 27a that molds the metal plate M. The first molding surface 27a has concaves and convexes formed thereon for molding the flow paths 102 in the metal plate M. The fixed-side molding section 27 is composed of a plurality of fixed-side molding blocks 28 that are arranged side by side and adjacent to each other in the surface direction. The first molding surface 27a is formed by the continuous upper surfaces of the plurality of fixed-side molding blocks 28.

[0020] The multiple fixed-side support blocks 25 are arranged side by side on the fixed-side backing plate 23, adjacent to one another in the planar direction. Each fixed-side support block 25 supports a single fixed-side molding block 28 via a shim 26 from the side opposite the first molding surface 27a. Each fixed-side support block 25 and the fixed-side molding block 28 supported by that fixed-side support block 25 have the same shape and are equal to or smaller in size in a planar view. Therefore, the arrangement of the multiple fixed-side support blocks 25 and the arrangement of the multiple fixed-side molding blocks 28 in a planar view are the same.

[0021] 4 and 5, the multiple fixed-side support blocks 25 are arranged side by side in the long side direction of the metal plate material M during press forming, i.e., in the first direction X. The multiple fixed-side support blocks 25 include one fixed-side support block 25A, two fixed-side support blocks 25B, two fixed-side support blocks 25C, and two fixed-side support blocks 25D.

[0022] 3, the fixed-side support block 25A supports a fixed-side molding block 28 that forms the center of the first molding surface 27a. The fixed-side support blocks 25B are adjacent to both sides of the fixed-side support block 25A in the first direction X. The fixed-side support blocks 25C are adjacent to each fixed-side support block 25B on the side opposite to the fixed-side support block 25A.

[0023] 4, the fixed-side support block 25D is adjacent to both sides of the fixed-side support block 25A and the fixed-side support block 25B in the second direction Y. In addition, both ends of each fixed-side support block 25D in the first direction X are adjacent to the fixed-side support block 25C in the first direction X.

[0024] 3 and 5, the portion of fixed-side molding section 27 that molds flow path 102 includes the center of first molding surface 27a and is composed of multiple fixed-side molding blocks 28. The portion of fixed-side molding section 27 that molds flow path 102 is supported by fixed-side support blocks 25A, 25B, and 25C.

[0025] The fixed-side support blocks 25 have different Young's moduli. More specifically, the closer to the center of the first molding surface 27a in the surface direction, the larger the Young's modulus of the fixed-side support blocks 25. In this embodiment, the fixed-side support block 25A, which is closest to the center of the first molding surface 27a, has the largest Young's modulus of the fixed-side support blocks 25. The Young's modulus of the fixed-side support block 25B is smaller than that of the fixed-side support block 25A and larger than that of the fixed-side support block 25C. The Young's modulus of the fixed-side support block 25C is the same as that of the fixed-side support block 25D.

[0026] The differences in Young's modulus among the multiple fixed-side support blocks 25 are achieved by using different materials. Fixed-side support block 25A is made of, for example, a cemented carbide alloy with a Young's modulus of approximately 600 GPa. Fixed-side support block 25B is made of, for example, a cemented carbide alloy with a Young's modulus of approximately 400 GPa. Fixed-side support blocks 25C and 25D are made of, for example, an alloy tool steel with a Young's modulus of approximately 200 GPa.

[0027] The fixed side support blocks 25C and 25D, which have the smallest Young's modulus among the multiple fixed side support blocks 25, have a larger Young's modulus than the metal plate material M. The material of the metal plate material M in this embodiment is, for example, stainless steel with a Young's modulus of about 190 GPa.

[0028] The fixed-side molding block 28 is made of, for example, high-speed tool steel having a Young's modulus of about 220 GPa. The fixed-side backing plate 23 and the shim 26 are made of, for example, alloy tool steel having a Young's modulus of about 200 GPa.

[0029] (Movable type 30) The movable mold 30 has the same configuration as the fixed mold 20 . Hereinafter, the description of the configuration of the movable mold 30 may be omitted by adding "3*" which is obtained by adding "10" to the symbol "2*" indicating the configuration of the fixed mold 20.

[0030] 3, the movable mold 30 includes a movable support base 31, a movable die set 32, a movable backing plate 33, a movable holding plate 34, a plurality of movable support blocks 35, a plurality of shims 36, and a movable molding portion 37. Each of the movable support blocks 35, each of the shims 36, and the movable molding portion 37 is held inside a holding hole 34a of the movable holding plate 34.

[0031] The movable side molding section 37 has a second molding surface 37a that molds the metal sheet M. The second molding surface 37a faces the first molding surface 27a. The movable side molding section 37 is composed of a plurality of movable side molding blocks 38 that are arranged side by side and adjacent to each other in the surface direction. The second molding surface 37a is formed by the continuation of the lower surfaces of the plurality of movable side molding blocks 38.

[0032] The boundaries between the movable forming blocks 38 and the boundaries between the fixed forming blocks 28 are positioned at positions that are offset in the planar direction. This makes it possible to prevent unintended steps from occurring in the metal plate material M.

[0033] As shown in FIG. 6, the multiple movable side support blocks 35 include one movable side support block 35A, two movable side support blocks 35B, two movable side support blocks 35C, and two movable side support blocks 35D.

[0034] 3 and 6, the portion of the movable side molding section 37 that molds the flow path 102 includes the center of the second molding surface 37a and is composed of multiple movable side molding blocks 38. The portion of the movable side molding section 37 that molds the flow path 102 is supported by movable side support blocks 35A, 35B, and 35C.

[0035] Of the multiple movable side support blocks 35, the closer the movable side support block 35 is to the center of the second molding surface 37a in the surface direction, the larger the Young's modulus. In this embodiment, of the multiple movable side support blocks 35, the movable side support block 35A, which is closest to the center of the second molding surface 37a, has the largest Young's modulus. Furthermore, the Young's modulus of the movable side support block 35B is smaller than that of the movable side support block 35A and larger than that of the movable side support block 35C. Furthermore, the Young's modulus of the movable side support block 35C is the same as that of the movable side support block 35D.

[0036] The material of each component of the movable mold 30 is the same as the material of each component of the fixed mold 20. That is, the Young's modulus of the movable-side support block 35A is the same as the Young's modulus of the fixed-side support block 25A. The Young's modulus of the movable-side support block 35B is the same as the Young's modulus of the fixed-side support block 25B. The Young's moduli of the movable-side support blocks 35C and 35D are the same as the Young's moduli of the fixed-side support blocks 25C and 25D and are greater than the Young's modulus of the metal plate material M.

[0037] <Operation of this embodiment> Of the multiple fixed-side support blocks 25, the fixed-side support blocks 25 closer to the center of the first forming surface 27a in the surface direction have a larger Young's modulus, i.e., higher rigidity. Therefore, during press-forming of the metal sheet M, the fixed-side support blocks 25 closer to the center of the first forming surface 27a in the surface direction are less likely to deform in the advancing / retracting direction. As a result, the portion of the fixed-side forming part 27 closer to the center of the first forming surface 27a is less likely to deform in the advancing / retracting direction.

[0038] Similarly, during press-forming of the metal plate M, the movable-side support block 35 closer to the center of the second forming surface 37a in the surface direction is less likely to deform in the advancing / retracting direction. As a result, the portion of the movable-side forming part 37 closer to the center of the second forming surface 37a is less likely to deform in the advancing / retracting direction.

[0039] <Effects of this embodiment> (1) The fixed mold 20 comprises a fixed side molding section 27 having a first molding surface 27a, and a plurality of fixed side support blocks 25 that support the fixed side molding section 27. The movable mold 30 comprises a movable side molding section 37 having a second molding surface 37a, and a plurality of movable side support blocks 35 that support the movable side molding section 37. Of the plurality of fixed side support blocks 25, the fixed side support blocks 25 closer to the center of the first molding surface 27a in the surface direction have a larger Young's modulus. Of the plurality of movable side support blocks 35, the movable side support blocks 35 closer to the center of the second molding surface 37a in the surface direction have a larger Young's modulus.

[0040] According to the above configuration, the above-mentioned action is achieved, and thus it is possible to prevent the press pressure from being insufficient at the center of the metal plate M, and therefore it is possible to prevent the press pressure from being non-uniformly applied to the metal plate M. Therefore, it is possible to prevent a decrease in the forming accuracy of the press die 10.

[0041] Furthermore, when the material of the metal plate material M is stainless steel, the press pressure is more likely to increase than when the material of the metal plate material M is titanium, for example. According to the above configuration, even when the press pressure increases, it is possible to prevent the press pressure acting on the metal plate material M from becoming uneven, and therefore it is possible to prevent a decrease in the forming accuracy of the press die 10.

[0042] (2) The Young's modulus of the fixed-side support block 25 having the smallest Young's modulus among the multiple fixed-side support blocks 25 is greater than the Young's modulus of the metal plate material M. The Young's modulus of the movable-side support block 35 having the smallest Young's modulus among the multiple movable-side support blocks 35 is greater than the Young's modulus of the metal plate material M.

[0043] According to the above configuration, during press forming, it is possible to prevent the fixed-side support block 25 having the smallest Young's modulus among the plurality of fixed-side support blocks 25 from deforming prior to deformation of the metal plate material M. Similarly, it is possible to prevent the movable-side support block 35 having the smallest Young's modulus among the plurality of movable-side support blocks 35 from deforming prior to deformation of the metal plate material M. Therefore, it is possible to prevent a decrease in the forming accuracy of the press die 10.

[0044] (3) The plurality of fixed-side support blocks 25 are arranged side by side in the first direction X. The plurality of movable-side support blocks 35 are arranged side by side in the first direction X. If the press pressure is insufficient in the center of the metal plate M having long and short sides, the variation in the press pressure in the long side direction of the metal plate M tends to be greater than the variation in the press pressure in the short side direction.

[0045] In this regard, according to the above configuration, the multiple fixed-side support blocks 25 and the multiple movable-side support blocks 35 are both arranged side by side in the first direction X, which is the direction of the long sides of the metal plate material M during press forming. This makes it possible to prevent the press pressure acting on the metal plate material M from becoming uneven in the first direction X. This makes it possible to prevent a decrease in the forming accuracy of the press die 10.

[0046] (4) The portion of the fixed-side molding section 27 that molds the flow path 102 includes the center of the first molding surface 27a and is supported by multiple fixed-side support blocks 25. The portion of the movable-side molding section 37 that molds the flow path 102 includes the center of the second molding surface 37a and is supported by multiple movable-side support blocks 35.

[0047] According to the above configuration, the portion of the fixed-side molding part 27 that forms the flow path 102 and the portion of the movable-side molding part 37 that forms the flow path 102 are less likely to deform in the forward / backward direction. This makes it possible to prevent the press pressure from becoming uneven in the portion of the metal plate M where the flow path 102 is formed. This makes it possible to improve the molding accuracy of the separator 100 for fuel cells.

[0048] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0049] As shown in Fig. 7, the fixed-side support block 25D may be omitted from the multiple fixed-side support blocks 25. In this case, the fixed-side molding portion 27 is supported by one fixed-side support block 25A, two fixed-side support blocks 25B, and two fixed-side support blocks 25C aligned in the first direction X. This modification can also be applied to the movable-side support block 35 in a similar manner. Even with this configuration, the above-described effects (1) to (4) can be achieved.

[0050] As shown in Fig. 8, the fixed-side support blocks 25C and 25D may be omitted from the multiple fixed-side support blocks 25. In this case, the fixed-side molding portion 27 is supported by one fixed-side support block 25A and two fixed-side support blocks 25B aligned in the first direction X. This modification can also be applied to the movable-side support block 35 in the same manner. Even with this configuration, the above-mentioned effects (1) to (4) can be achieved.

[0051] The metal plate material M is not limited to that used as the substrate of the separator 100, but may be that used in various products. A plurality of fixed-side support blocks 25 may be arranged side by side in the short side direction of the metal plate material M during press forming. This modification can also be applied to the movable-side support block 35 in the same manner.

[0052] The Young's modulus of the fixed-side support block 25 with the smallest Young's modulus among the multiple fixed-side support blocks 25 may be equal to or less than the Young's modulus of the metal plate M. In this case, it is preferable that the fixed-side support block 25 with the smallest Young's modulus supports a portion of the fixed-side molding portion 27 that does not plastically deform the metal plate M. This modified example can also be applied to the movable-side support block 35 in the same manner.

[0053] The multiple fixed-side support blocks 25 may include one fixed-side support block 25A and multiple fixed-side support blocks 25B surrounding the outer periphery of the fixed-side support block 25A. Furthermore, the multiple fixed-side support blocks 25 may include multiple fixed-side support blocks 25C surrounding the outer periphery of the multiple fixed-side support blocks 25B. This modified example can also be applied to the movable-side support block 35 in the same manner.

[0054] The Young's modulus of the movable support block 35A does not have to be the same as the Young's modulus of the fixed support block 25A. The Young's modulus of the movable support block 35B does not have to be the same as the Young's modulus of the fixed support block 25B. The Young's modulus of the movable support blocks 35C and 35D does not have to be the same as the Young's modulus of the fixed support blocks 25C and 25D.

[0055] The fixed-side molding section 27 does not have to be composed of multiple fixed-side molding blocks 28. The fixed-side molding section 27 may be composed of a single block. This modification can also be applied to the movable-side molding section 37 in the same manner.

[0056] <Additional Notes> The above embodiment includes the configurations described in the following supplementary notes. [Appendix 1] A press die for press-forming metal sheet material, comprising a fixed die and a movable die configured to be able to advance and retreat relative to the fixed die, wherein the fixed die comprises a fixed side molding section having a first molding surface, and a plurality of fixed side support blocks made of metal, arranged side by side in a planar direction perpendicular to the advance and retreat direction of the movable die and supporting the fixed side molding section from the opposite side to the first molding surface in the advance and retreat direction; the movable die comprises a movable side molding section having a second molding surface opposite to the first molding surface, and a plurality of movable side support blocks made of metal, arranged side by side in the planar direction and supporting the movable side molding section from the opposite side to the second molding surface in the advance and retreat direction; wherein, of the plurality of fixed side support blocks, the fixed side support blocks closer to the center of the first molding surface in the planar direction have a larger Young's modulus, and the movable side support blocks closer to the center of the second molding surface in the planar direction have a larger Young's modulus.

[0057] [Appendix 2] A press mold described in [Appendix 1], wherein the Young's modulus of the fixed side support block having the smallest Young's modulus among the plurality of fixed side support blocks and the Young's modulus of the movable side support block having the smallest Young's modulus among the plurality of movable side support blocks are each greater than the Young's modulus of the metal plate material.

[0058] [Appendix 3] A press die described in [Appendix 1] or [Appendix 2], wherein the shape of the metal plate is a rectangle having long sides and short sides, the plurality of fixed side support blocks are arranged in a row in the long side direction of the metal plate during press forming, and the plurality of movable side support blocks are arranged in a row in the long side direction of the metal plate during press forming.

[0059] [Appendix 4] The press die is a press die described in any one of [Appendix 1] to [Appendix 3], which is configured to press-form the metal plate material, which is a base material for a separator for a fuel cell, to form a plurality of groove-shaped flow paths through which a fluid flows on the surface of the metal plate material, and the portion of the fixed side molding part that forms the flow paths includes a central portion of the first molding surface and is supported by a plurality of the fixed side support blocks, and the portion of the movable side molding part that forms the flow paths includes a central portion of the second molding surface and is supported by a plurality of the movable side support blocks. [Explanation of symbols]

[0060] M…Metal plate material X…first direction Y...Second direction 10...Press mold 20…Fixed type 21…Fixed side support stand 22...Fixed side die set 23...Fixed side backing plate 24...Fixed side holding plate 24a...Retaining hole 25, 25A, 25B, 25C, 25D...Fixed side support block 26…Sim 27…Fixed side molding part 27a...first molding surface 28...Fixed side molding block 30…Movable type 31…Movable side support stand 32... Movable die set 33... Movable backing plate 34... Movable side holding plate 34a...Retaining hole 35, 35A, 35B, 35C, 35D... Movable side support block 36…Sim 37... Movable side molding part 37a…Second molding surface 38... Movable side molding block 100...Separator 101...Manifold 102...Flow path 103...Rib

Claims

1. A press die for press-forming a metal plate material, comprising: a fixed die; and a movable die configured to be movable toward and away from the fixed die, The fixed type is a fixed molding portion having a first molding surface; a plurality of fixed-side support blocks made of metal that are arranged side by side in a plane direction perpendicular to the advancing / retracting direction of the movable mold and support the fixed-side molding part from the side opposite to the first molding surface in the advancing / retracting direction, The movable mold is a movable molding section having a second molding surface facing the first molding surface; a plurality of metallic movable-side support blocks arranged side by side in the surface direction and supporting the movable-side molding part from the opposite side to the second molding surface in the advancing / retracting direction, Among the plurality of fixed-side support blocks, the fixed-side support blocks closer to the center of the first molding surface in the surface direction have a larger Young's modulus, Among the plurality of movable-side support blocks, the movable-side support blocks closer to the center of the second molding surface in the surface direction have a larger Young's modulus. Press mold.

2. the Young's modulus of the fixed-side support block having the smallest Young's modulus among the plurality of fixed-side support blocks and the Young's modulus of the movable-side support block having the smallest Young's modulus among the plurality of movable-side support blocks are each greater than the Young's modulus of the metal plate material; The press die according to claim 1 .

3. The metal plate has a rectangular shape having long sides and short sides, the plurality of fixed-side support blocks are arranged side by side in the long-side direction of the metal plate material during press forming, the plurality of movable-side support blocks are arranged side by side in the long side direction of the metal plate material during press forming; The press die according to claim 1 .

4. the press die presses the metal plate material, which is a base material of a separator for a fuel cell, to form a plurality of groove-like flow paths through which a fluid flows on a surface of the metal plate material; a portion of the fixed-side molding section that molds the flow path includes a central portion of the first molding surface and is supported by a plurality of the fixed-side support blocks, a portion of the movable-side molding part that molds the flow path includes a central portion of the second molding surface and is supported by a plurality of the movable-side support blocks; The press die according to any one of claims 1 to 3.

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