Composite member for fuel cells, metal mold, and manufacturing method of composite member for fuel cells

Abstract

To facilitate a blur inspection of a composite member for fuel cells.SOLUTION: A composite member 1 for fuel cells comprises: a separator 2 including on a surface 2U a gasket body arrangement part 20 and a blur allowable section 21 which is disposed adjacently to the gasket body arrangement part 20; and a gasket 4 including a gasket body 40 which is disposed in the gasket body arrangement section 20. In the blur allowable section 21, the side close to the gasket body arrangement part 20 is defined as a proximate side, and the side far from the gasket body arrangement part 20 is defined as a separate side. The blur allowable section 21 includes a first groove part 210 which is recessed in a proximate side end 21a and a second groove part 211 which is recessed in a separate side end 21b.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a composite member for a fuel cell, a mold used in manufacturing the composite member for a fuel cell, and a method for manufacturing the composite member for a fuel cell. [Background technology]

[0002] The fuel cell separator described in Patent Document 1 includes a separator central region, an outer edge portion extending from the separator central region to the outer edge, a rubber molded body made of rubber molded from a rubber molding material using a mold, and an adhesive layer formed on the outer edge portion to bond the rubber molded body to the outer edge portion. When the rubber molded body is molded, the rubber molding material leaks out from between the mold and the adhesive layer. The leaked rubber molding material forms a thin film-like burr that is connected to the rubber molded body. The burr is bonded to the outer edge portion of the separator via the adhesive layer. This makes it possible to suppress the burr from coming off or peeling off from the rubber molded body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-95961 A Summary of the Invention [Problem to be solved by the invention]

[0004] If the burrs attached to the separator are too large, they may interfere with the work of the next process. Therefore, the size of the burrs is visually inspected by an operator before the next process. However, the burrs are thin-film shaped. Furthermore, the size of the burrs varies. Therefore, the inspection is complicated. Therefore, the composite member for a fuel cell, the mold, and the manufacturing method for the composite member for a fuel cell disclosed herein aim to facilitate the inspection of the burrs of the composite member for a fuel cell. [Means for solving the problem]

[0005] (1) In order to solve the above problems, the composite member for a fuel cell disclosed herein is a composite member for a fuel cell comprising: a separator having on its surface a gasket main body placement portion and a burr-permitted section arranged adjacent to the gasket main body placement portion; and a gasket having a gasket body arranged in the gasket main body placement portion, wherein the side of the burr-permitted section closer to the gasket main body placement portion is defined as a near side and the side farther from the gasket main body placement portion is defined as a far side, and the burr-permitted section has a first groove portion recessed in the near side end and a second groove portion recessed in the far side end.

[0006] The separator of the composite member for a fuel cell according to the present disclosure includes a burr tolerance zone, which makes it possible to control the range in which the raw material (the raw material of the gasket) leaks, i.e., the range in which burrs are formed.

[0007] The burr-permitted section has a first groove and a second groove. The first groove can suppress leakage of raw material from the gasket body (protrusion of burrs). The second groove can suppress leakage of raw material from the burr-permitted section.

[0008] Moreover, the second groove portion is disposed at the distant end of the burr allowable section. In other words, the second groove portion defines the outer edge of the burr allowable section (the allowable limit value of the burr). Therefore, during burr inspection, the size of the burr can be confirmed based on the positional relationship between the outer edge of the actual burr and the second groove portion. This makes it possible to easily inspect the burr.

[0009] (2) Preferably, in the configuration of (1) above, an adhesive layer is further provided on the surface of the separator, the adhesive layer being laminated in an adhesive section including the gasket body placement portion and the burr-allowable section. According to this configuration, the burr is adhered to the burr-allowable section via the adhesive layer. Therefore, the burr is less likely to peel off from the burr-allowable section, i.e., the separator.

[0010] (3) In any of the above configurations, it is preferable that the burr-permitted section has an inter-groove flat portion interposed between the first groove portion and the second groove portion. When a burr is formed on the inter-groove flat portion, the burr has a film-like shape that spreads in the planar direction of the inter-groove flat portion. The burr is entirely bonded to the inter-groove flat portion via an adhesive layer. Therefore, the burr is unlikely to peel off from the inter-groove flat portion.

[0011] (4) In any of the above configurations, it is preferable that the separator has a second rib protruding from the back surface in correspondence with the second groove portion on the front surface. According to this configuration, the second rib protrudes from the back surface of the separator. Therefore, the second rib can be used for purposes other than burr inspection (for example, inspecting the amount of adhesive that has spread to the back surface of the separator).

[0012] (5) In any of the above configurations, it is preferable that the first groove portion is arranged in an endless ring shape around the gasket body placement portion. According to this configuration, the first groove portion surrounds the gasket body placement portion in an endless ring shape. This makes it possible to suppress leakage of raw material outside the gasket body placement portion, and therefore outside the flash allowable zone.

[0013] (5-1) In the above configuration (5), it is preferable that the second groove portion is arranged in an endless ring shape around the gasket body placement portion. According to this configuration, the first groove portion and the second groove portion surround the gasket body placement portion in an endless ring shape. Therefore, the inner and outer double groove portions (the first groove portion and the second groove portion) can suppress leakage of raw material outside the burr allowable zone.

[0014] (5-2) In the above configuration (5), it is preferable that the second groove portion is arranged to have ends. With this configuration, the second groove portion can be selectively arranged only in the portion of the gasket body arrangement portion where it is desired to suppress leakage of raw material (formation of burrs).

[0015] (6) In order to solve the above problems, the mold disclosed herein is used for manufacturing a composite member for a fuel cell having any of the above configurations, and includes a first mold and a second mold arranged opposite the first mold, and in a mold closed state, a cavity is defined between the first mold and the second mold, the cavity having: a separator accommodating portion in which the separator is accommodated, a gasket body molding portion that is connected to the separator accommodating portion in the first mold direction and that molds the gasket body in the gasket body arrangement portion, and a burr molding portion that is arranged adjacent to the gasket body molding portion and corresponds to the burr allowable section, and the first mold has a first shaping rib that is pressed against the near side end of the burr allowable section when the mold is closed and that recesses the first groove portion, and a second shaping rib that is pressed against the far side end of the burr allowable section when the mold is closed and that recesses the second groove portion.

[0016] The cavity of the mold of the present disclosure is provided with a flash forming portion. The flash forming portion can control the range from which the raw material (the raw material of the gasket) leaks, i.e., the range in which the flash is formed. The flash forming portion may be closed (or crushed) when the mold is clamped and a clamping force is applied. In other words, the molding surface of the first mold and the molding surface of the second mold may be in contact with each other due to the clamping force of the mold.

[0017] The first mold has a first shaping rib and a second shaping rib. The first shaping rib is pressed against the near side end to suppress leakage of raw material from the gasket body molding portion. The second shaping rib is pressed against the far side end to suppress leakage of raw material from the flash molding portion.

[0018] In addition, the second groove portion formed by the second shaping rib is disposed at the end of the spaced side of the burr allowable section. In other words, the second groove portion defines the outer edge of the burr allowable section (the allowable limit value of the burr). Therefore, during burr inspection, the size of the burr can be confirmed based on the positional relationship between the outer edge of the actual burr and the second groove portion. This makes it possible to easily inspect the burr.

[0019] (7) Preferably, in the configuration of (6) above, an adhesive layer is further provided on the surface of the separator, the adhesive layer being laminated in an adhesive section including the gasket body placement portion and the burr-allowable section. According to this configuration, the burr is adhered to the burr-allowable section via the adhesive layer. Therefore, the burr is less likely to peel off from the burr-allowable section, i.e., the separator.

[0020] (8) Preferably, in the configuration of (6) or (7) above, the burr-tolerant section has a groove flat portion interposed between the first groove portion and the second groove portion, and the first mold has an inter-rib flat portion interposed between the first shaping rib and the second shaping rib and pressed against the groove flat portion when the mold is closed.

[0021] When the mold is in a clamped state and a clamping force is being applied, the clamping force presses the inter-rib flat portion against the inter-groove flat portion of the separator. On the other hand, when the mold is in a clamped state and after the load is removed (for example, when the mold is being transported), the inter-rib flat portion separates from the inter-groove flat portion due to residual pressure in the gasket body molding portion, and raw material may leak from the gasket body molding portion into the gap between the inter-rib flat portion and the inter-groove flat portion, i.e., the flash molding portion.

[0022] In this case, after the raw material hardens, a burr is formed in the burr forming portion. The burr is a film-like material that spreads in the planar direction of the flat portion between the grooves. The burr is also bonded to the flat portion between the grooves over its entire surface via an adhesive layer. Therefore, the burr is difficult to peel off from the flat portion between the grooves.

[0023] (9) Preferably, in any of the configurations (6) to (8) above, the second shaping rib is configured to recess the second groove portion into the front surface of the separator and to form a second rib protruding from the rear surface of the separator in correspondence with the second groove portion.

[0024] According to this configuration, the second groove portion and the second rib can be formed by a common second shaping rib. The second rib after forming protrudes from the back surface of the separator. Therefore, the second rib can be used for a purpose other than burr inspection (for example, inspection of the amount of adhesive that has spread to the back surface of the separator).

[0025] (10) In any of the configurations (6) to (9) above, it is preferable that the protrusion amount of the second shaping rib is equal to or less than the protrusion amount of the first shaping rib. With this configuration, the second shaping rib can suppress leakage of raw material outside the burr forming section. Also, the second shaping rib can allow leakage of air outside the burr forming section.

[0026] (11) In any of the configurations (6) to (10) above, it is preferable that the first shaping rib is arranged in an endless ring shape around the gasket body molding portion. According to this configuration, the first groove portion formed by the first shaping rib surrounds the gasket body placement portion in an endless ring shape. This makes it possible to suppress leakage of raw material outside the gasket body placement portion, and therefore outside the flash allowable zone.

[0027] (11-1) Preferably, in the configuration of (11) above, the second shaping rib is arranged in an endless ring shape around the gasket body placement portion. According to this configuration, the first groove portion formed by the first shaping rib and the second groove portion formed by the second shaping rib surround the gasket body placement portion in an endless ring shape. Therefore, the inner and outer double groove portions (first groove portion, second groove portion) can suppress leakage of raw material outside the burr allowable zone.

[0028] (11-2) In the above configuration (11), it is preferable that the second shaping rib is arranged in an end shape. With this configuration, the second groove portion can be selectively arranged only in the portion of the gasket body arrangement portion where it is desired to suppress leakage of raw material (formation of burrs).

[0029] (12) In order to solve the above problems, the manufacturing method of the present disclosure is a manufacturing method of a composite member for a fuel cell having a configuration of any one of (1) to (5-2) above, by using a mold having a configuration of any one of (6) to (11-2) above, the manufacturing method including an injection step, a transport step, and a vulcanization step, the injection step including a separator arrangement step of arranging the separator having an adhesive layer laminated on the surface in the separator accommodating portion of the cavity in an open mold state, and a mold clamping step of pressing the first shaped rib against the near side end of the burr allowable section to form a recess in the first groove portion, The method includes a groove forming process in which the second shaping rib is pressed against the separated side end of the burr tolerance section to form a recess in the second groove, and an injection process in which raw material is injected into the gasket body molding portion of the cavity after the mold is closed, wherein in the transport process, the mold in a closed state is transported from a location where the injection process is performed to a location where the vulcanization process is performed while allowing leakage of the raw material from the gasket body molding portion to the burr molding portion, and in the vulcanization process, the raw material is hardened to prepare the gasket body, and the gasket body is adhered to the gasket body placement portion via the adhesive layer.

[0030] The manufacturing method of the present disclosure includes an injection process, a conveying process, and a vulcanization process (crosslinking process). In the injection process, the first shaping rib is pressed against the proximal side end. This makes it possible to suppress leakage of raw material from the gasket body molding portion. Also, in the injection process, the second shaping rib is pressed against the distal side end. This makes it possible to suppress leakage of raw material from the flash molding portion. In this way, the first shaping rib, the second shaping rib, and the flash molding portion make it possible to control the range from which raw material leaks, i.e., the range in which flash is formed in the vulcanization process.

[0031] In addition, the second groove portion formed by the second shaping rib is disposed at the end of the spaced side of the burr allowable section. In other words, the second groove portion defines the outer edge of the burr allowable section (the allowable limit value of the burr). Therefore, during burr inspection, the size of the burr can be confirmed based on the positional relationship between the outer edge of the actual burr and the second groove portion. This makes it possible to easily inspect the burr.

[0032] (13) Preferably, in the configuration of (12) above, the burr-tolerant section has an inter-groove flat portion interposed between the first groove portion and the second groove portion, and the first mold has an inter-rib flat portion interposed between the first shaping rib and the second shaping rib and pressed against the inter-groove flat portion when the mold is closed.

[0033] In the injection process (when clamping the mold), a clamping force is applied to the mold. As a result, the flat parts between the ribs are pressed against the flat parts between the grooves of the separator. In the transport process (after unloading), the flat parts between the ribs are separated from the flat parts between the grooves due to residual pressure in the gasket body molding part, and raw material may leak from the gasket body molding part into the gap between the flat parts between the ribs and the flat parts between the grooves, i.e., the flash molding part.

[0034] In this case, a burr is formed in the burr-molded portion after the vulcanization process (after the raw material hardens). The burr is in the form of a film that spreads in the planar direction of the flat portion between the grooves. The burr is also bonded to the flat portion between the grooves over its entire surface via an adhesive layer. Therefore, the burr is difficult to peel off from the flat portion between the grooves.

[0035] (14) Preferably, in the configuration of (12) or (13) above, the second shaping rib is configured to recess the second groove portion into the front surface of the separator and to form a second rib protruding from the rear surface of the separator in correspondence with the second groove portion.

[0036] According to this configuration, in the injection process, the second groove portion and the second rib can be formed by a common second shaping rib. The second rib after molding protrudes from the back surface of the separator. Therefore, the second rib can be used for purposes other than burr inspection (for example, inspection of the amount of adhesive that has spread to the back surface of the separator).

[0037] (15) In any of the configurations (12) to (14) above, it is preferable that the protrusion amount of the second shaping rib is equal to or less than the protrusion amount of the first shaping rib. With this configuration, the second shaping rib can suppress leakage of raw material outside the burr forming section. Also, the second shaping rib can allow leakage of air outside the burr forming section. Effect of the Invention

[0038] According to the composite member for a fuel cell, the mold, and the manufacturing method of the composite member for a fuel cell disclosed herein, burr inspection of the composite member for a fuel cell can be facilitated. [Brief description of the drawings]

[0039] [Figure 1] FIG. 1 is a top view of a composite member for a fuel cell according to a first embodiment. [Diagram 2] FIG. 2 is an enlarged view of the area within box II in FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III of FIG. [Figure 4] FIG. 4 is a cross-sectional view of a mold used in manufacturing the composite member for a fuel cell of the first embodiment. [Diagram 5] FIG. 5 is a partial cross-sectional view of a mold in an injection step (separator arrangement step) of the manufacturing method of the composite member for a fuel cell according to the first embodiment. [Figure 6] FIG. 6 is a partial cross-sectional view of a mold in an injection step (groove forming step) of the manufacturing method. [Figure 7] FIG. 7 is a partial cross-sectional view of a mold in an injection step of the manufacturing method. [Figure 8] FIG. 8 is a partial cross-sectional view of the mold in a transfer step of the manufacturing method. [Figure 9] FIG. 9 is an enlarged view of the area within the frame IX in FIG. [Figure 10] FIG. 10 is a partial cross-sectional view of a mold in a vulcanization step of the same manufacturing method. [Figure 11] FIG. 11 is a partial cross-sectional view of the composite member for a fuel cell according to the second embodiment. [Figure 12] FIG. 12 is a partial top view of a composite member for a fuel cell according to a third embodiment. [Figure 13] FIG. 13 is a partial top view of the composite member for a fuel cell according to the fourth embodiment. [Figure 14] FIG. 14 is a partial cross-sectional view of a mold in an injection step (injection step) of the manufacturing method of the composite member for a fuel cell according to the fifth embodiment. [Figure 15] FIG. 15 is a partial top view of a composite member for a fuel cell according to another embodiment (part 1). [Figure 16] 16(A) to 16(C) are partial top views of composite members for a fuel cell according to other embodiments (Nos. 2 to 4). [Figure 17] FIG. 17 is a partial top view of a composite member for a fuel cell according to another embodiment (No. 5). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0040] Hereinafter, embodiments of the composite member for a fuel cell, the mold, and the method for manufacturing the composite member for a fuel cell according to the present disclosure will be described.

[0041] First Embodiment [Configuration of composite materials for fuel cells] First, the configuration of the composite member for a fuel cell of this embodiment will be described. Fig. 1 shows a top view (surface view) of the composite member for a fuel cell of this embodiment. Fig. 2 shows an enlarged view of the inside of frame II in Fig. 1. Fig. 3 shows a cross-sectional view taken along the line III-III in Fig. 2. Note that in Figs. 1 and 2 (top views), the gasket 4 (exterior view) is hatched. Also, in Fig. 2, the burr allowable section 21 is shown through the burr 41.

[0042] As shown in Fig. 1, the composite material 1 for a fuel cell is a gasket-integrated separator. Within a frame F on the upper surface (front surface) 2U, a "membrane electrode assembly (MEA) with gas diffusion layers (GDL) stacked thereon" (hereinafter referred to as a "power generation section") (not shown) is stacked. A fuel cell stack is formed by stacking a plurality of composite materials 1 for a fuel cell and a plurality of power generation sections alternately in the vertical direction (front-back direction, stacking direction). The composite material 1 for a fuel cell includes a separator 2, an adhesive layer 3, and five (a plurality of) gaskets 4.

[0043] (Separator 2, Adhesive layer 3) 1 to 3, the separator 2 has a rectangular thin plate shape. Six manifolds (openings) 23 for gas and air are formed in the separator 2. Five frame-shaped gasket body placement sections 20 and five frame-shaped burr allowable sections 21 are arranged on the upper surface 2U of the separator 2.

[0044] As shown in FIG. 3, the gasket body disposing portion 20 has a planar shape. The burr-permitted section 21 is disposed adjacent to the right side (outside the frame) of the gasket body disposing portion 20. As shown in FIG. 2, when viewed from the upper side (front side), the burr-permitted section 21 extends in the same direction as the gasket body disposing portion 20. The burr-permitted section 21 includes a first groove section 210, a second groove section 211, and a flat section between the grooves 212. In the burr-permitted section 21, the left side (the side closer to the gasket body disposing portion 20) is the near side, and the right side (the side farther from the gasket body disposing portion 20) is the far side. The first groove section 210 is recessed in the near side end 21a of the burr-permitted section 21. More specifically, the near side end 21a corresponds to the left end of the first groove section 210. The cross section in the left-right direction (short side) of the first groove section 210 has a rectangular shape. The second groove portion 211 is recessed at the distant side end 21b of the burr-allowable section 21. More specifically, the distant side end 21b corresponds to the right end of the second groove portion 211. The left-right cross section of the second groove portion 211 has a rectangular shape. The inter-groove flat portion 212 has a planar shape. The inter-groove flat portion 212 is interposed between the first groove portion 210 and the second groove portion 211.

[0045] On the upper surface 2U, the gasket body placement portion 20 and the inter-groove flat portion 212 are in the same vertical position. Furthermore, the groove bottom of the first groove portion 210 and the groove bottom of the second groove portion 211 are in the same vertical position. Furthermore, the groove bottom of the first groove portion 210 and the groove bottom of the second groove portion 211 are located lower than the gasket body placement portion 20 and the inter-groove flat portion 212.

[0046] A frame-shaped first rib 220 and a frame-shaped second rib 221 are disposed on the lower surface (rear surface) 2D of the separator 2. The first rib 220 and the second rib 221 each protrude from the lower surface 2D. When viewed from above (see-through), the first rib 220 overlaps with the first groove portion 210, and the second rib 221 overlaps with the second groove portion 211. The left-right cross sections of the first rib 220 and the second rib 221 each have a rectangular shape.

[0047] The adhesive layer 3 is adhered and laminated to the adhesive section A of the upper surface 2U of the separator 2. The adhesive section A includes a gasket body placement section 20 and a burr allowable section 21, which will be described later. The adhesive section A may be the entire upper surface 2U (excluding the inside of the frame F (the power generation section)), or may be a part of the upper surface 2U.

[0048] (Gasket 4) The five gaskets 4 are adhered and stacked on the upper surface of the adhesive layer 3. The five gaskets 4 are adhered and fixed to the upper surface 2U via the adhesive layer 3. Each of the five gaskets 4 has a frame shape. As shown in FIG. 1, the large central gasket 4 surrounds the two left and right manifolds 23 and the frame F (power generation section) in an endless ring shape from the outside in the planar direction. The remaining four gaskets 4 each surround the manifolds 23 at the four corners in an endless ring shape from the outside in the planar direction.

[0049] The gasket 4 includes a frame-shaped gasket body 40 and a burr 41. As shown in Figs. 2 and 3, the gasket body 40 is disposed in the gasket body disposing portion 20. The burr 41 is integrally connected to the right side (outside the frame) of the gasket body 40. The burr 41 is formed in the entire burr-allowed section 21. That is, the burr 41 is formed from the first groove portion 210, via the inter-groove flat portion 212, to the second groove portion 211. However, as will be described later, the presence or absence, shape, area (occupancy rate), number of burrs 41 in the burr-allowed section 21 are not particularly limited.

[0050] [Mold configuration] Next, the configuration of a mold used in the production of the composite material for a fuel cell of this embodiment will be described. As described later, the production method of the composite material for a fuel cell of this embodiment includes an injection process, a transport process, and a vulcanization process (crosslinking process).

[0051] FIG. 4 shows a cross-sectional view of a mold used in the production of the composite member for a fuel cell of this embodiment. The left-right intermediate portion is omitted. The cross section of the separator 2 corresponds to the cross section IV-IV in FIG. 1. The frame II in FIG. 4 corresponds to the frame II in FIG. 1. FIG. 5 shows a partial cross-sectional view of a mold in the injection step (separator arrangement step) of the production method of the composite member for a fuel cell of this embodiment. FIG. 6 shows a partial cross-sectional view of a mold in the injection step (groove forming step) of the production method. FIG. 7 shows a partial cross-sectional view of a mold in the injection step (injection step) of the production method. FIG. 8 shows a partial cross-sectional view of a mold in the conveying step of the production method. FIG. 9 shows an enlarged view of the inside of the frame IX in FIG. 8. FIG. 10 shows a partial cross-sectional view of a mold in the vulcanization step of the production method. FIG. 5 to FIG. 8 and FIG. 10 correspond to the frame II in FIG. 1 and FIG. 4. As shown in FIG. 4, the metal mold (molding die) 5 includes a first die (movable die) 5U, a second die (fixed die) 5D, and a cavity 5M.

[0052] As shown in Fig. 6, a first shaping rib 50, a second shaping rib 51, and an inter-rib flat portion 52 are arranged on the lower surface (molding surface) 50U of the first mold 5U. The first shaping rib 50 and the second shaping rib 51 protrude downward from the inter-rib flat portion 52. As shown in Fig. 4, the second mold 5D is arranged below the first mold 5U so as to face each other in the up-down direction. The first mold 5U can approach and move away from the second mold 5D from above.

[0053] 7, in the mold-clamped state, a cavity 5M is defined between a first mold 5U and a second mold 5D. The cavity 5M includes a separator accommodating portion 53, five frame-shaped gasket body molding portions 54, and five frame-shaped flash molding portions 55.

[0054] 4 and 5, the separator accommodating portion 53 is recessed into the upper surface (molding surface) 50D of the second mold 5D. The separator 2 with the adhesive layer 3 is accommodated in the separator accommodating portion 53. A manifold protrusion 530 protrudes from the bottom surface of the separator accommodating portion 53. The manifold protrusion 530 is inserted into the manifold 23 of the separator 2.

[0055] 7, the gasket body molding section 54 is connected to the upper side (first mold 5U direction) of the separator accommodating section 53. The gasket body molding section 54 corresponds to the gasket body disposing section 20 of the separator 2. The gasket body molding section 54 molds the gasket body 40 shown in FIG.

[0056] As shown in FIG. 7, the flash forming portion 55 is disposed adjacent to the right side (outside the frame) of the gasket body molding portion 54. When viewed from above, the flash forming portion 55 extends in the same direction as the gasket body molding portion 54. The flash forming portion 55 corresponds to the flash allowable section 21 of the separator 2. As shown in FIG. 7, when the mold is in a clamped state and a clamping force G is applied, the flash forming portion 55 is closed. As shown in FIG. 8, when the mold is in a clamped state and a clamping force G is not applied, the flash forming portion 55 may be open. In this case, as shown in FIG. 9, the raw material M flows into the flash forming portion 55. For this reason, as shown in FIG. 10, a flash 41 is formed in the flash forming portion 55, that is, in the flash allowable section 21.

[0057] [Method of manufacturing composite materials for fuel cells] Next, a method for producing the composite material for a fuel cell according to the present embodiment will be described. As described above, the method for producing the composite material for a fuel cell according to the present embodiment includes an injection step, a transport step, a vulcanization step (crosslinking step), and an inspection step.

[0058] (Injection process) The injection process includes a separator arrangement process, a groove forming process, and a pouring process. As shown in Fig. 5, in the separator arrangement process, the separator 2 is arranged from above in the separator accommodation portion 53 of the cavity 5M in the mold open state. Note that an adhesive (i.e., adhesive layer 3) is applied in advance to the adhesion section A on the upper surface 2U of the separator 2. As shown in Fig. 4, when the separator 2 is arranged, the manifold projection 530 of the separator accommodation portion 53 is inserted into the manifold 23 of the separator 2.

[0059] As shown in FIG. 6 and FIG. 7, in the groove forming step, the first mold 5U is pressed against the second mold 5D by a predetermined mold clamping force G. That is, the mold is clamped. By clamping the mold, the first shaping rib 50 is pressed against the proximal end 21a (more specifically, the section including the proximal end 21a) of the burr allowable section 21 of the upper surface 2U of the separator 2, and the first groove section 210 is recessed in the upper surface 2U. Also, the first rib 220 protrudes from the lower surface 2D by an amount corresponding to the recessed first groove section 210. The upper surface 50D of the second mold 5D has a lower hardness than the first shaping rib 50. Therefore, the upper surface 50D of the second mold 5D is recessed by an amount corresponding to the protrusion of the first rib 220 from the lower surface 2D.

[0060] Similarly, by clamping the mold, the second shaping rib 51 is pressed against the separated side end 21b (more specifically, the section including the separated side end 21b) of the burr allowable section 21 of the upper surface 2U of the separator 2, and the second groove section 211 is recessed in the upper surface 2U. Also, the second rib 221 protrudes from the lower surface 2D by an amount corresponding to the recessed second groove section 211. The upper surface 50D of the second mold 5D has a lower hardness than the second shaping rib 51. Therefore, the upper surface 50D of the second mold 5D is recessed by an amount corresponding to the protrusion of the second rib 221 from the lower surface 2D. Also, by clamping the mold, the inter-rib flat section 52 is pressed against the inter-groove flat section 212.

[0061] 7, in the injection step, the raw material M of the gasket 4 is injected into the five gasket body molding portions of the cavity 5M after the mold is clamped. The raw material M is filled into the gasket body molding portions .

[0062] As described above, the flash forming portion 55 is closed by the clamping force G. In addition, the first shaping rib 50 is pressed against the proximal end 21a of the separator 2. Therefore, the raw material M is unlikely to leak from the gasket body forming portion 54 to the flash forming portion 55.

[0063] (Transportation process) As shown in Figures 8 and 9, in the transportation process, the mold 5 in a clamped state is transported from the location where the injection process is performed to the location where the vulcanization process is performed, while allowing leakage of raw material M from the gasket body molding section 54 to the flash molding section 55.

[0064] As shown in Fig. 8, the mold clamping force G shown in Fig. 7 is not applied to the mold 5. For this reason, as shown in Fig. 9, a gap C is generated in the flash forming portion 55 due to the residual pressure P in the gasket body molding portion 54. In other words, the flash forming portion 55 opens. For this reason, the raw material M flows from the gasket body molding portion 54 into the flash forming portion 55 via the leakage path L shown in Fig. 9.

[0065] (Vulcanization process) 8 and 10, in the vulcanization process, the mold 5 in a clamped state is heated at a predetermined temperature for a predetermined time to harden the raw material M in the cavity 5M and produce the gasket 4 (gasket body 40, flash 41). Additionally, the gasket 4 is adhered and fixed to the gasket body placement portion 20 and the flash allowable section 21 via the adhesive layer 3. Thereafter, the mold is opened and the composite member 1 for a fuel cell is removed from the mold 5.

[0066] (Inspection process) In the inspection process, the fuel cell composite member 1 is inspected for burrs 41. In the inspection, an operator visually inspects the size of the burrs 41. Specifically, as shown in FIG. 2, the operator compares the position of the outer edge of the burr 41 with the position of the second groove portion 211 (the outer edge of the burr tolerance section 21). If the outer edge of the burr 41 does not reach the second groove portion 211, or if the outer edge of the burr 41 is contained within the second groove portion 211, the operator judges it as pass (no effect on the work of the next process). On the other hand, if the outer edge of the burr 41 extends beyond the second groove portion 211, the operator judges it as fail (effect on the work of the next process). In this case, the operator removes the burrs 41 based on the second groove portion 211 or the first groove portion 210 so as not to affect the work of the next process.

[0067] [Effects] Next, the effects of the composite member for a fuel cell, the mold, and the manufacturing method of the composite member for a fuel cell according to this embodiment will be described. As shown in Figures 2 and 3, the separator 2 of the composite member for a fuel cell 1 has a burr-permitted section 21. The burr-permitted section 21 makes it possible to control the range in which the raw material (raw material of the gasket 4) M leaks, that is, the range in which the burr 41 is formed.

[0068] 2 and 3, the burr-allowed section 21 has a first groove portion 210 and a second groove portion 211. The first groove portion 210 can suppress leakage of the raw material M from the gasket body 40 (protrusion of the burr 41). The second groove portion 211 can suppress leakage of the raw material M from the burr-allowed section 21.

[0069] Moreover, the second groove portion 211 is disposed at the distant side end 21b of the burr-allowable section 21. That is, the second groove portion 211 defines the outer edge of the burr-allowable section 21 (the allowable limit value of the burr 41). Therefore, during burr inspection, the size of the burr 41 can be confirmed using the positional relationship between the outer edge of the actual burr 41 and the second groove portion 211 as a guide. This makes it possible to easily inspect the burr 41.

[0070] 3, on the upper surface 2U of the separator 2, an adhesive layer 3 is laminated in an adhesive section A including the gasket body placement portion 20 and the burr-allowed section 21. Therefore, the burr 41 is adhered to the burr-allowed section 21 via the adhesive layer 3. Therefore, the burr 41 is unlikely to peel off from the burr-allowed section 21, i.e., the separator 2.

[0071] 3, the burr-permitted section 21 has an inter-groove flat portion 212 interposed between a first groove portion 210 and a second groove portion 211. The burr 41 has a flat film shape spreading in the planar direction of the inter-groove flat portion 212. The burr 41 is entirely adhered to the inter-groove flat portion 212 via the adhesive layer 3. For this reason, the burr 41 is unlikely to peel off from the inter-groove flat portion 212.

[0072] 3, the separator 2 has a second rib 221 that protrudes from the lower surface 2D in correspondence with the second groove portion 211 of the upper surface 2U. Therefore, the second rib 221 can be used for purposes other than burr inspection (for example, inspecting the amount of adhesive (adhesive layer 3) that has spread around the lower surface 2D). Similarly, the separator 2 has a first rib 220 that protrudes from the lower surface 2D in correspondence with the first groove portion 210 of the upper surface 2U. Therefore, the first rib 220 can be used for purposes other than burr inspection.

[0073] 8 and 9, the cavity 5M of the mold 5 is provided with a burr forming portion 55. The burr forming portion 55 can control the range from which the raw material M leaks, that is, the range in which the burr 41 is formed. As shown in Fig. 7, the burr forming portion 55 may be closed in the mold clamped state. That is, the mold clamping force G of the mold 5 may cause the lower surface (molding surface) 50U of the first mold 5U and the upper surface (molding surface) 50D of the second mold 5D to abut against each other.

[0074] Moreover, the first mold 5U has a first shaping rib 50 and a second shaping rib 51. Therefore, the first shaping rib 50 is pressed against the proximal side end 21a, thereby making it possible to suppress leakage of the raw material M from the gasket body molding portion 54. Moreover, the second shaping rib 51 is pressed against the distal side end 21b, thereby making it possible to suppress leakage of the raw material M from the flash molding portion 55.

[0075] Furthermore, the raw material M flowing through the flash forming portion 55 tends to accumulate in the first groove portion 210 on the upstream side and the second groove portion 211 on the downstream side. That is, the first groove portion 210 and the second groove portion 211 function as buffer portions for the raw material M. This makes it possible to suppress leakage of the raw material M from the gasket body forming portion 54. Furthermore, it is possible to suppress leakage of the raw material M from the flash forming portion 55.

[0076] 8 and 9, the surface shape of the burr forming portion 55 has an uneven shape due to the multiple grooves (first groove portion 210, second groove portion 211). Along the uneven shape, the leakage path L is made redundant in a zigzag shape. This makes it possible to suppress leakage of the raw material M from the gasket body forming portion 54. That is, it is possible to minimize the area where the burr 41 is formed. Also, it is possible to suppress leakage of the raw material M from the burr forming portion 55. That is, it is possible to keep the burr 41 within the burr allowable section 21.

[0077] 9, an overlapping portion W is provided in the leakage path L between the side surface of the first groove portion 210 and the side surface of the first shaping rib 50. The overlapping portion W extends in the vertical direction (the opening and closing direction of the mold 5). Therefore, regardless of the degree to which the mold 5 is opened and closed, the gap width of the overlapping portion W is always narrow. Therefore, leakage of the raw material M can be suppressed.

[0078] Similarly, in the leakage path L, an overlapping portion is set between the side surface of the second groove portion 211 and the side surface of the second shaping rib 51. The overlapping portion extends in the vertical direction. Therefore, regardless of the degree of opening and closing of the mold 5, the gap width of the overlapping portion is always narrow. Therefore, leakage of the raw material M can be suppressed.

[0079] 7, during mold clamping, the clamping force G presses the inter-rib flat portion 52 against the inter-groove flat portion 212 of the separator 2. After unloading (for example, during transport of the mold 5), the inter-rib flat portion 52 moves away from the inter-groove flat portion 212 due to residual pressure P in the gasket body molding portion 54, etc., and raw material M may leak from the gasket body molding portion 54 into the gap C between the inter-rib flat portion 52 and the inter-groove flat portion 212, i.e., the flash molding portion 55.

[0080] In this case, as shown in Fig. 10, after the raw material M hardens, a burr 41 is formed on the burr forming portion 55. The burr 41 has a film shape that spreads in the planar direction of the inter-groove flat portion 212. The burr 41 is also entirely bonded to the inter-groove flat portion 212 via the adhesive layer 3. For this reason, the burr 41 is difficult to peel off from the inter-groove flat portion 212.

[0081] As shown in FIG. 7, in the groove forming step, the second groove 211 and the second rib 221 can be formed by a common second shaping rib 51. Therefore, compared to the case where the second groove 211 and the second rib 221 are separately formed, the structure of the mold 5 can be simplified. Furthermore, the number of steps can be reduced. Similarly, in the groove forming step, the first groove 210 and the first rib 220 can be formed by a common first shaping rib 50. Therefore, compared to the case where the first groove 210 and the first rib 220 are separately formed, the structure of the mold 5 can be simplified. Furthermore, the number of steps can be reduced.

[0082] Second Embodiment The present embodiment differs from the first embodiment in that the burr-permitting sections are disposed on the outer and inner sides of the frame-shaped gasket body disposing section. Here, only the difference will be described.

[0083] FIG. 11 shows a partial cross-sectional view of the composite member for a fuel cell of this embodiment. The same reference numerals are used for parts corresponding to those in FIG. 3. As shown in FIG. 11, two burr-permitted sections 21 are arranged on the left side (inside the frame) and right side (outside the frame) of the gasket body-arrangement section 20. The configuration of the two burr-permitted sections 21 is the same. The two burr-permitted sections 21 are arranged symmetrically (symmetrically in the inside and outside of the frame) with respect to the gasket body-arrangement section 20. This embodiment and the first embodiment have similar functions and effects with respect to parts having a common configuration. As in this embodiment, multiple burr-permitted sections 21 may be arranged on both sides of the gasket body-arrangement section 20.

[0084] <Third embodiment> The present embodiment differs from the first embodiment in that the composite member for a fuel cell includes an island-shaped gasket body mounting portion in addition to a frame-shaped gasket body mounting portion, and the first groove portion and the second groove portion are each arranged in an endless annular shape around the island-shaped gasket body mounting portion. Here, only the differences will be described.

[0085] FIG. 12 shows a partial top view of the composite member for a fuel cell of this embodiment. The part shown in FIG. 12 corresponds to the frame XII in FIG. 1. The parts corresponding to those in FIG. 2 are denoted by the same reference numerals. As shown in FIG. 12, a gasket 4a is disposed on the upper surface 2U of the separator 2 via an adhesive layer 3. The gasket 4a is independent of the frame-shaped gasket 4 shown in FIG. 1. When viewed from above, the gasket 4a has a smaller area than the gasket 4. The gasket 4a includes only an island-shaped (non-frame-shaped, block-shaped) gasket body 40a. The gasket body 40a is disposed in the gasket body disposing portion 20. No burrs 41 (see FIG. 2) are disposed in the burr-allowed section 21. Therefore, the burr-allowed section 21 is exposed.

[0086] The present embodiment and the first embodiment have the same effect with respect to the common parts. The island-shaped gasket body 40a has a smaller area than the frame-shaped gasket body 40 (see FIG. 2). Therefore, in the injection process shown in FIG. 7, when the raw material M is filled into the gasket body molding part 54 for the island-shaped gasket body 40a, molding defects (e.g., chipping) are more likely to occur in the gasket body 40a due to insufficient filling than when the raw material M is filled into the gasket body molding part 54 for the frame-shaped gasket body 40. In order to suppress the occurrence of such molding defects, it is necessary to make the filling pressure of the raw material M higher when filling the island-shaped gasket body 40a than when filling the frame-shaped gasket body 40.

[0087] However, when the filling pressure is increased, the raw material M is more likely to leak from the gasket body molding portion 54 after the load is removed (the conveying process shown in Figs. 8 and 9). This makes it easier for the burrs 41 shown in Fig. 3 to occur. In addition, since the gasket body 40a is narrower than the gasket body 40, the burr allowable section 21 must be narrower accordingly.

[0088] In this regard, in the composite member for a fuel cell of this embodiment, the first groove portion 210 and the second groove portion 211 each surround the periphery of the island-shaped gasket body 40a (gasket body placement portion 20) in an endless annular shape, as shown in Fig. 12. This makes it possible to suppress leakage of raw material to the outside of the burr-allowed section 21.

[0089] Like the composite member for a fuel cell of this embodiment, no burrs may be formed in the burr-allowed section 21. Of course, burrs may be formed in the entirety or part of the burr-allowed section 21.

[0090] <Fourth embodiment> The difference between this embodiment and the third embodiment is that the second groove portion is partially disposed around the gasket body disposing portion. Here, only the difference will be described. FIG. 13 shows a partial top view of the composite member for a fuel cell of this embodiment. The same reference numerals are used for the parts corresponding to FIG. 12. As shown in FIG. 13, the two second groove portions 211 are disposed only in a part of the periphery of the gasket body disposing portion 20. The second groove portion 211 has ends. The second groove portion 211 is selectively disposed in a region around the gasket body disposing portion 20 corresponding to a portion where it is desired to suppress the formation of the burr 41. Therefore, the burr 41 is not formed on the outside of the second groove portion 211 (the outside in the planar direction based on the gasket body disposing portion 20). On the other hand, the second groove portion 211 is not disposed in a portion where the formation of the burr 41 is permitted in the region around the gasket body disposing portion 20. Therefore, as shown in an emphasized manner in FIG. 13, the burr 41 is formed on the outside of the portion where the second groove portion 211 is not disposed.

[0091] The present embodiment and the third embodiment have similar effects with respect to the common portions of the configuration. As in the composite member for a fuel cell of the present embodiment, the second groove portion 211 may be selectively disposed only in the portion of the gasket body disposing portion 20 where leakage of raw material (formation of burrs 41) is desired to be suppressed.

[0092] <Fifth embodiment> The difference between this embodiment and the first embodiment is that the protruding amount of the second shaping rib of the mold is set to be smaller than the protruding amount of the first shaping rib. Here, only the difference will be described.

[0093] Fig. 14 shows a partial cross-sectional view of a mold in the injection step (injection step) of the manufacturing method of the composite member for a fuel cell of this embodiment. The same reference numerals are used to indicate parts corresponding to those in Fig. 7. As shown in Fig. 12, the amount of protrusion of the second shaping rib 51 from the inter-rib flat portion 52 is set to be smaller than the amount of protrusion of the first shaping rib 50 from the inter-rib flat portion 52. Therefore, the groove depth of the second groove portion 211 is shallower than the groove depth of the first groove portion 210. In addition, the amount of protrusion of the second rib 221 is smaller than the amount of protrusion of the first rib 220.

[0094] The present embodiment and the first embodiment have the same action and effect with respect to the common parts. According to the mold 5 of the present embodiment, the second shaping rib 51, which protrudes less than the first shaping rib 50, can suppress leakage of the raw material M outside the flash forming portion 55, while allowing leakage of air outside the flash forming portion 55. In addition, the first shaping rib 50, which protrudes more than the second shaping rib 51, can suppress leakage of the raw material M from the gasket body forming portion 54 to the flash forming portion 55.

[0095] <Other> The above describes the embodiments of the composite member for fuel cells, the mold, and the manufacturing method of the composite member for fuel cells according to the present disclosure. However, the embodiments are not particularly limited to the above embodiments. Various modified and improved embodiments that can be implemented by those skilled in the art are also possible.

[0096] The presence or absence, shape, area (occupancy), number of burrs 41 in the burr-allowed section 21, etc. are not particularly limited. Fig. 15 shows a partial top view of a composite member for a fuel cell of another embodiment (part 1). Note that parts corresponding to those in Fig. 2 are indicated with the same reference numerals. As shown in Fig. 15, burrs 41 may be disposed in part of the burr-allowed section 21. Also, burrs 41 may be disposed throughout the entire burr-allowed section 21 (see Fig. 2). Also, burrs 41 do not have to be disposed in the burr-allowed section 21 (see Fig. 12).

[0097] The relative positional relationship between the gasket body disposing portion 20 and the burr-permitted section 21 is not particularly limited. Fig. 16(A) to Fig. 16(C) show partial top views of composite members for fuel cells according to other embodiments (parts 2 to 4). The parts shown in Fig. 16(A) to Fig. 16(C) correspond to the frame XVI in Fig. 1. The parts corresponding to Fig. 2 are denoted by the same reference numerals. As shown in Fig. 16(A), the burr-permitted section 21 may be disposed outside the frame of the frame-shaped gasket body disposing portion 20. As shown in Fig. 16(B), the burr-permitted section 21 may be disposed inside the frame of the frame-shaped gasket body disposing portion 20. As shown in Fig. 16(C), the burr-permitted section 21 may be disposed outside and inside the frame of the frame-shaped gasket body disposing portion 20. That is, the burr-permitted section 21 may be disposed on at least one of the outside and inside of the frame of the frame-shaped gasket body disposing portion 20.

[0098] The interval between the first groove portion 210 and the second groove portion 211 (the width in the short-side direction (the direction perpendicular to the extending direction of the burr-allowable section 21) of the groove flat portion 212) is not particularly limited. FIG. 17 shows a partial top view of a composite member for a fuel cell according to another embodiment (part 5). The same reference numerals are used for parts corresponding to those in FIG. 12. As shown in FIG. 17, the gasket body arrangement portion 20 (gasket 4a, gasket body 40a) extends in a wavy line and island shape. The first groove portion 210 extends in a wavy line and endless ring shape along the outer edge of the gasket body arrangement portion 20. On the other hand, the second groove portion 211 is arranged on the outer side of the first groove portion 210 in the planar direction (the outer side in the planar direction based on the gasket body arrangement portion 20). The second groove portion 211 extends in an elliptical shape (a shape in which a pair of semicircles are connected by a pair of straight lines) and endless ring shape. An inter-groove flat portion 212 is interposed between the first groove portion 210 and the second groove portion 211. The interval between the first groove portion 210 and the second groove portion 211 does not have to be constant as in this embodiment. Of course, the interval may be constant.

[0099] The groove shapes (longitudinal shape, lateral shape), groove width, and groove depth of the first groove portion 210 and the second groove portion 211 may be the same or different. The longitudinal shapes of the first groove portion 210 and the second groove portion 211 may be, for example, linear, broken line, curved (arc, wavy, etc.), or a shape that is a suitable combination of these shapes. The first groove portion 210 and the second groove portion 211 may extend in an endless ring shape. The first groove portion 210 and the second groove portion 211 may extend in an end-bearing shape. The lateral shapes of the first groove portion 210 and the second groove portion 211 may be, for example, rectangular, trapezoidal, arcuate, V-shaped, C-shaped, U-shaped, or a suitable combination of these shapes. The number of grooves (first groove portion 210, second groove portion 211) arranged in the burr-allowed section 21 is not particularly limited. For example, three or more grooves may be arranged in the burr-allowing section 21 .

[0100] The arrangement direction of the first mold 5U and the second mold 5D of the mold 5 shown in Fig. 4 (opening and closing direction of the mold 5) is not particularly limited. It may be a vertical direction, a horizontal direction, or a direction intersecting the vertical and horizontal directions. The first mold 5U may be a movable type and the second mold 5D may be a fixed type. Of course, the first mold 5U may be a fixed type and the second mold 5D may be a movable type.

[0101] 6 and 7, the two grooves (grooves for accommodating the first rib 220 and the second rib 221) in the upper surface 50D of the second mold 5D are recessed in the upper surface 50D in the groove forming step. However, the two grooves may be recessed in the upper surface 50D in advance before the groove forming step.

[0102] The method of inspecting the burrs 41 in the inspection step of the manufacturing method of the fuel cell composite material 1 of this embodiment is not particularly limited. An operator may visually inspect the burrs 41. An operator may inspect the burrs 41 using a magnifying glass, a microscope, an image sensor (CCD, CMOS), or the like. The inspection of the burrs 41 may be automatically performed using a burr inspection device equipped with an image sensor and an image processing device. For example, an image of the fuel cell composite material 1 may be obtained by an image sensor, the image may be processed by an image processing device, and the image processing device may compare the positional relationship between the burrs 41 and the second groove portion 211 to automatically determine pass / fail.

[0103] The material of the separator 2 is not particularly limited. It may be a resin, metal, or the like that is conductive and non-corrosive. Examples include stainless steel, titanium, copper, magnesium, aluminum, carbon, graphite, ceramics, and conductive resins (thermoplastic or thermosetting resins containing carbon, graphite, polyacrylonitrile carbon fibers, etc.).

[0104] The material of the gasket 4 is not particularly limited. It is sufficient that the elastomer has insulating properties and rubber elasticity after curing. It is sufficient that the raw material M has fluidity (before curing). The gasket 4 may contain a crosslinking agent, a co-crosslinking agent, a processing aid, a softener, a reinforcing material, etc. in addition to the rubber component. Suitable rubber components include VMQ (silicone rubber), silicone rubber other than VMQ (PVMQ (phenyl vinyl methyl silicone rubber), FVMQ (fluorovinyl methyl silicone rubber), etc.), EPDM (ethylene propylene diene rubber), FKM (fluoro rubber), etc. When liquid silicone rubber is used as the raw material M, the type of liquid silicone rubber is not particularly limited. It may be a one-component type or a two-component type. It may also be a room temperature curing type or a heat curing type. [Explanation of symbols]

[0105] 1: composite member for fuel cell, 2: separator, 2D: lower surface (rear surface), 2U: upper surface (front surface), 20: gasket body placement portion, 21: burr allowable area, 21a: adjacent side end, 21b: distant side end, 210: first groove portion, 211: second groove portion, 212: flat portion between grooves, 220: first rib, 221: second rib, 23: manifold, 3: adhesive layer, 4: gasket, 4a: gasket, 40: gasket body, 40a : Gasket body, 41: Flash, 5: Mold, 5D: Second mold, 5M: Cavity, 5U: First mold, 50: First shaped rib, 50D: Upper surface, 50U: Lower surface, 51: Second shaped rib, 52: Flat portion between ribs, 53: Separator accommodating portion, 530: Manifold protrusion, 54: Gasket body molding portion, 55: Flash molding portion, A: Adhesive section, C: Gap, G: Mold clamping force, L: Leak path, M: Raw material, P: Residual pressure, W: Overlap

Claims

1. a separator having, on its surface, a gasket body placement portion and a burr-allowing section that is disposed adjacent to the gasket body placement portion; a gasket having a gasket body to be placed in the gasket body placement portion; A composite member for a fuel cell comprising: In the burr allowable section, a side closer to the gasket main body disposing portion is defined as a proximity side, and a side farther from the gasket main body disposing portion is defined as a separation side, A composite member for a fuel cell, wherein the burr-permitted section has a first groove portion recessed in the proximal end and a second groove portion recessed in the distal end.

2. The composite member for a fuel cell according to claim 1 , further comprising an adhesive layer laminated on the surface of the separator in an adhesive section including the gasket body placement section and the burr allowable section.

3. The composite member for a fuel cell according to claim 2 , wherein the burr-permitted section has a groove flat portion interposed between the first groove portion and the second groove portion.

4. The composite member for a fuel cell according to claim 1 , wherein the separator has a second rib protruding from a back surface thereof in correspondence with the second groove portion on the front surface.

5. The composite member for a fuel cell according to claim 1 , wherein the first groove portion is arranged in an endless annular shape around the gasket main body placement portion.

6. A mold used in manufacturing the composite member for a fuel cell according to claim 1, the mold comprising a first mold and a second mold disposed opposite the first mold, In a mold clamping state, between the first mold and the second mold, a separator housing portion in which the separator is housed; a gasket body molding section that is connected to the separator accommodating section in the first mold direction and that molds the gasket body in the gasket body placement section; a flash forming portion disposed adjacent to the gasket body forming portion and corresponding to the flash allowable section; A cavity having a The first mold is characterized by having a first shaping rib that is pressed against the near side end of the burr tolerance section when the mold is closed, and which recesses the first groove portion, and a second shaping rib that is pressed against the far side end of the burr tolerance section when the mold is closed, and which recesses the second groove portion.

7. The mold according to claim 6 , further comprising an adhesive layer laminated on the surface of the separator in an adhesive section including the gasket body placement section and the burr allowable section.

8. the burr-allowing section has an inter-groove flat portion interposed between the first groove portion and the second groove portion, The mold according to claim 7 , wherein the first mold has an inter-rib flat portion interposed between the first shaping rib and the second shaping rib and pressed against the inter-groove flat portion when the mold is closed.

9. The mold according to claim 6, wherein the second shaping rib recesses the second groove portion into the front surface of the separator and molds a second rib protruding from the rear surface of the separator in correspondence with the second groove portion.

10. The mold according to claim 6 , wherein the protruding amount of the second shaping rib is equal to or less than the protruding amount of the first shaping rib.

11. The mold according to claim 6 , wherein the first shaping rib is arranged in an endless annular shape around the gasket body molding portion.

12. A method for producing a composite member for a fuel cell according to claim 1 by using the mold according to claim 6, the method comprising an injection step, a transport step, and a vulcanization step, The injection step includes: a separator placement step of placing the separator having an adhesive layer laminated on the surface thereof in the separator receiving portion of the cavity in an open state of the mold; a groove forming process in which the first shaping rib is pressed against the near side end of the burr allowable section by clamping the mold, thereby forming a recess in the first groove portion, and the second shaping rib is pressed against the far side end of the burr allowable section, thereby forming a recess in the second groove portion; an injection step of injecting a raw material into the gasket body molding portion of the cavity after the mold is closed; having In the transport step, the mold in a clamped state is transported from a location where the injection step is performed to a location where the vulcanization step is performed while allowing the raw material to leak from the gasket body molding portion to the flash molding portion, The manufacturing method is characterized in that, in the vulcanization process, the raw material is hardened to prepare the gasket body, and the gasket body is adhered to the gasket body placement portion via the adhesive layer.

13. the burr-allowing section has an inter-groove flat portion interposed between the first groove portion and the second groove portion, The manufacturing method according to claim 12, wherein the first mold has an inter-rib flat portion interposed between the first shaping rib and the second shaping rib and pressed against the inter-groove flat portion when the mold is closed.

14. The manufacturing method according to claim 12, wherein the second shaped rib is formed by recessing the second groove portion in the front surface of the separator and molding a second rib protruding from the rear surface of the separator in correspondence with the second groove portion.

15. The manufacturing method according to claim 12, wherein the protruding amount of the second shaping rib is equal to or less than the protruding amount of the first shaping rib.

Images