JP5082322B2 - Mold for molding - Google Patents

Description

  The present invention relates to a molding die, a fuel cell separator, and a method for producing the same.

  In recent years, in fuel cells that obtain electric power from an electrochemical reaction between hydrogen and oxygen, application to various uses such as portable devices and automobiles has been studied. A fuel cell has a structure in which several tens to several hundreds of basic structural units composed of an electrolyte membrane, electrodes and separators, that is, unit cells are usually stacked in series. In a general fuel cell manufacturing method, an electrolyte membrane and an electrode are formed in advance as an electrolyte membrane / electrode assembly (MEA), and a separator is disposed thereon. As the separator, a separator in which a flow path for supplying a fuel such as hydrogen, an oxidant composed of air or oxygen, and a refrigerant for cooling the cell is formed on at least one side is used.

  In the separator, it is necessary to provide sufficient electrical conductivity to ensure electrical connection with the adjacent MEA and increase the power generation efficiency of the fuel cell. In addition, the separator supports the stacked structure of unit cells. Therefore, sufficient mechanical strength is required. In addition, in recent years, there has been a demand for thinner separators in accordance with the demand for smaller fuel cells. Furthermore, in order to reduce the contact resistance between unit cells in the laminated structure of unit cells, improvement in thickness accuracy is also required.

  A conventional fuel cell separator is molded by putting a molding material containing a resin and a carbon material into a compression mold and pressurizing it. Various types of molding mold structures for forming such fuel cell separators have been proposed (see, for example, Patent Documents 1 to 5).

  This compression mold has the following features: (1) The air in the mold and in the molding material can be efficiently discharged out of the mold, and (2) The molding material filled in the mold is discharged out of the mold. We need to be able to do it.

  In general, as shown in FIG. 29 (a), a conventional compression mold has a concave mold 101 having a concave portion (cavity) 101a and a convex mold 102 having a convex portion (core) 102a. Yes. In order to satisfy the above (1) and (2), a shear edge (region P in the figure) is provided in which the side wall of the concave portion 101a and the side wall of the convex portion 102a are opposed to each other.

  When the molding material 120a is molded using such a mold, the excess molding material flows out from the recess 101a and is discharged to the clearance (clearance) of the shear edge, and the air in the mold and in the molding material Can be efficiently discharged out of the mold.

As a mold, as shown in FIG. 30 (a), there is also a combined compression molding mold composed of a mold 101 having a recess 101a and a mold 102 having a recess 102a. This combined mold has a simple structure and can reduce the thickness of the entire mold.
JP 2001-198921 A JP 2003-170459 A JP 2004-230788 A JP 2004-71334 A Japanese Patent No. 3751911

  However, in the compression mold having the conventional shear edge structure shown in FIG. 29A, resin burrs are generated in the direction intersecting the main surface 120A of the molded product 120 as shown in FIG. Further, in the conventional die for compression molding shown in FIG. 30A, resin burrs are generated in a direction substantially parallel to the main surface 120A of the molded product 120 as shown in FIG.

  When stacking a plurality of separators (molded products) in a fuel cell, the molded products must be brought into sufficient contact with each other. However, as shown in FIG. 29B, if resin burrs are generated in the direction intersecting the main surface 120A of the molded product 120, there is a problem that the molded products 120 cannot be sufficiently brought into contact with each other.

  Further, the positioning accuracy when stacking a plurality of separators (molded products) is determined by the outer peripheral shape of the molded product. However, as shown in FIG. 30B, if resin burrs are generated in a direction substantially parallel to the main surface 120A of the molded product 120, the positioning accuracy deteriorates and the molded products 120 cannot be stacked with high accuracy. There is.

  Further, the above-described resin burrs are generated not only in the outer peripheral portion of the molded product but also in a through-hole in the surface of the molded product. Therefore, there is also a problem that the molded products cannot be sufficiently brought into contact with each other by the resin burr formed in the through hole portion, as described above.

Moreover, in order to remove these resin burrs, a complicated deburring process is required.
The present invention has been made in view of the above-mentioned problems, and the object thereof is to allow the molded products to be brought into sufficient contact with each other, to position and stack the molded products with good accuracy, and to be complicated. It is an object to provide a molding die, a fuel cell separator and a method for manufacturing the same that do not require any deburring process.

  The molding die of the present invention is a molding die for molding a molding material, and includes a first mold member and a second mold member. The first mold member has a first recess. The second mold member has a first convex portion provided corresponding to the first concave portion. The 1st convex part has a projection part on the upper surface facing the bottom face of the 1st crevice. The protruding portion has a side surface connected to the side surface of the first convex portion and a top surface facing the cavity, and is formed so as to surround a part or the entire circumference of the edge portion of the upper surface.

  According to the molding die of the present invention, since the molding material is molded by the concave portion of the first mold member and the convex portion of the second mold member, the burr of the molded product is formed on the upper surface of the convex portion. It occurs in the crossing direction. Here, since the projection is provided on the upper surface edge of the projection, burrs are generated starting from the top surface of the projection. Thereby, since the starting point which a burr | flash can be made into the cavity side from the upper surface of the said convex part, it can suppress that a burr | flash protrudes from the upper surface of the said convex part rather than a prior art example. For this reason, when stacking the molded products, the molded products can be sufficiently brought into contact with each other. Further, since burrs of the molded product do not occur in a direction substantially parallel to the upper surface, the molded product can be positioned and stacked with good accuracy. Moreover, since it can suppress that a burr | flash protrudes from the upper surface of the said convex part rather than a prior art example, a complicated deburring process becomes unnecessary.

  In the above molding die, preferably, the first mold member has a second convex portion surrounding the first concave portion, and the first convex portion and the first concave portion are associated with each other. In a state where the first mold member and the second mold member are overlapped, the upper surface of the second convex portion is positioned below the upper surface of the first convex portion with respect to the bottom surface of the first concave portion. doing.

  As a result, when the mold is removed, the burr is broken on the cavity side with respect to the upper surface position of the first convex portion, so that the burr is prevented from protruding from the upper surface of the first convex portion.

  Preferably, in the molding die described above, the second mold member has a connection side surface constituted by a side surface of the first convex portion and a side surface of the protruding portion connected to the side surface of the first convex portion. Yes. The connection side surface has a first side surface portion and a second side surface portion located on the top surface side of the projection portion with respect to the first side surface portion. The inclination angle of the second side surface portion with respect to the normal to the bottom surface of the first recess is larger than the inclination angle of the first side surface portion with respect to the normal.

  As a result, the molded product is broken at the burr portion at the same time as the demolding, so that the work of removing the burr portion after the demolding becomes unnecessary.

  Preferably, in the molding die described above, the second mold member has a connection side surface constituted by a side surface of the first convex portion and a side surface of the protruding portion connected to the side surface of the first convex portion. Yes. The first mold member has a second convex portion surrounding the periphery of the first concave portion. The second mold member has a second concave portion that surrounds the first convex portion and is provided corresponding to the second convex portion. In a state where the first mold member and the second mold member are overlapped with the first convex portion and the first concave portion corresponding to each other, the shortest distance between the connecting side surface and the second convex portion is the first. The distance is smaller than the distance between the top surface of the second convex portion and the bottom surface of the second concave portion.

  Thereby, at the time of mold removal, it becomes easier to crack between the connection side surface and the second convex portion than between the upper surface of the second convex portion and the bottom surface of the second concave portion. For this reason, it is suppressed that a burr | flash protrudes from the upper surface of a 1st convex part in the case of mold removal.

  Another molding die of the present invention is a molding die for molding a molding material to form a molded product, and includes a first mold member and a second mold member. Yes. The first mold member has a hole-forming convex part for forming a hole in the molded product and a concave part surrounding the hole-forming convex part. The second mold member has a hole forming concave portion provided corresponding to the hole forming convex portion and a convex portion surrounding the hole forming concave portion. The convex part of the second mold member has a protrusion on the top surface facing the bottom surface of the concave part. The protrusion has a side surface connected to the side surface of the convex portion of the second mold member and a top surface facing the cavity, and is formed so as to surround the entire circumference of the hole forming concave portion.

  According to another molding die of the present invention, since the hole is formed in the molding material by the hole forming convex portion of the first mold member and the hole forming concave portion of the second mold member, molding is performed. The burr of the product is generated in a direction intersecting the upper surface of the hole forming convex portion. Here, since the protruding portion is provided on the convex portion of the second mold member so as to surround the entire circumference of the hole forming concave portion, burrs are generated starting from the top surface of the protruding portion. Thereby, since the starting point which a burr | flash can be made into the cavity side from the upper surface of the said convex part, it can suppress that a burr | flash protrudes from the upper surface of the said convex part rather than a prior art example. For this reason, when stacking the molded products, the molded products can be sufficiently brought into contact with each other. Further, since burrs of the molded product do not occur in a direction substantially parallel to the upper surface, the molded product can be positioned and stacked with good accuracy. Moreover, since it can suppress that a burr | flash protrudes from the upper surface of the said convex part rather than a prior art example, a complicated deburring process becomes unnecessary.

  In the other molding die described above, preferably, the flow path forming convex part for forming the flow path connected to the hole of the molded product is used for forming the hole for forming the hole to which the flow path is connected. The first mold member is formed so as to be connected to the convex portion.

  If a burr occurs on the surface side where the flow path and the hole are connected, a burr exists at the connection portion between the flow path and the hole, and the flow of fluid between the flow path and the hole is hindered. . However, in the other molding die described above, the protruding portion is formed on the second mold member opposite to the first mold member to which the flow path forming convex portion and the hole forming convex portion are connected. Since it is formed, burrs do not occur at the connection portion between the flow path and the hole. Therefore, the fluid flow is not hindered by the burr.

  A fuel cell separator according to the present invention is a fuel cell separator having a manifold hole and a flow path connected to the hole, and a fuel cell separator is provided on any one of the opposed surfaces of the fuel cell separator. A step portion having a convex portion on the outer peripheral side and a concave portion on the inner peripheral side is formed so as to surround the entire periphery of the edge of the battery separator.

  According to the fuel cell separator of the present invention, the step portion including the convex portion on the outer peripheral side and the concave portion on the inner peripheral side is formed so as to surround the entire periphery of the edge portion of the fuel cell separator. Although this convex part is a burr | flash, since there exists a recessed part in the inner peripheral side of a burr | flash, the starting point of a burr | flash generate | occur | produces from the bottom face of a recessed part. For this reason, it is suppressed that a burr protrudes from the surface of the separator for fuel cells. For this reason, when stacking the fuel cell separators, the fuel cell separators can be sufficiently brought into contact with each other. Further, since the burr of the fuel cell separator does not occur in a direction substantially parallel to the upper surface, the fuel cell separator can be positioned and stacked with good accuracy. Moreover, since it can suppress that a burr | flash protrudes from the upper surface of the said convex part rather than a prior art example, a complicated deburring process becomes unnecessary.

  Another fuel cell separator of the present invention is a fuel cell separator having a manifold hole and a flow path connected to the hole, and the bottom surface of the flow path is flat and the flow path is connected. A step portion having a convex portion on the inner peripheral side and a concave portion on the outer peripheral side is formed so as to surround the hole on the surface on the opposite side of the surface on which the flow path is formed.

  According to another fuel cell separator of the present invention, a stepped portion having a convex portion on the inner peripheral side and a concave portion on the outer peripheral side is formed so as to surround the hole for the manifold. Although this convex part is a burr | flash, since the recessed part exists in the outer peripheral side of a burr | flash, the starting point of burr | flash generation | occurrence | production comes from the bottom face of a recessed part. For this reason, it is suppressed that a burr protrudes from the surface of the separator for fuel cells. For this reason, when stacking the fuel cell separators, the fuel cell separators can be sufficiently brought into contact with each other. Further, since the burr of the fuel cell separator does not occur in a direction substantially parallel to the upper surface, the fuel cell separator can be positioned and stacked with good accuracy. Moreover, since it can suppress that a burr | flash protrudes from the upper surface of the said convex part rather than a prior art example, a complicated deburring process becomes unnecessary.

  In the fuel cell, water is generated by the reaction between the fuel gas and the oxygen gas. For this reason, if there is a burr at the connection portion between the flow path and the hole, the generated water is difficult to flow from the flow path to the hole due to the burr and accumulates in the flow path. When the accumulated water mass flows into the adjacent cell, the gas flow becomes unstable, and the battery voltage is disturbed. However, in the present invention, since the convex portion serving as a burr is formed on the surface opposite to the surface on which the flow path is formed, no burr is generated at the connection portion between the flow path and the hole. Therefore, the above battery voltage is not disturbed.

  The fuel cell separator manufacturing method of the present invention is characterized in that a fuel cell separator is manufactured through a step of molding a molding material using the molding die described above.

  According to the method for manufacturing a separator for a fuel cell of the present invention, the molded products can be sufficiently brought into contact with each other, the molded products can be positioned and stacked with good accuracy, and complicated deburring is not required. A fuel cell separator can be manufactured.

  As described above, according to the present invention, the molded products can be sufficiently brought into contact with each other, the molded products can be positioned and stacked with good accuracy, and a complicated deburring process is unnecessary. A mold, a separator for a fuel cell, and a manufacturing method thereof can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view schematically showing a configuration of a molding die in an embodiment of the present invention. 2 is a schematic plan view showing the shaping side surface of the lower mold (mold member 1) of the molding mold shown in FIG. 1, and FIG. 3 is an upper mold ( It is a schematic plan view which shows the surface by the side of shaping of the mold member 2). 4, FIG. 5, and FIG. 6 are cross-sectional views showing enlarged regions R1, R3, and R4 of FIG. 1 corresponds to a cross section taken along line II in FIG. 2 and line II in FIG.

  1 to 3, a molding die 10 of the present embodiment is a molding die for molding a molding material, and includes a mold member 1 (FIG. 2) and a mold member. 2 (FIG. 3). The mold member 1 has a concave portion 1a on the surface facing the mold member 2, and has a convex portion 1d surrounding the periphery of the concave portion 1a. The mold member 2 has a convex portion 2a provided on the surface facing the mold member 1 so as to correspond to the concave portion 1a. The mold member 2 has a concave portion 2d that surrounds the convex portion 2a and is provided corresponding to the convex portion 1d.

Referring to FIG. 4, the convex portion 2a has a top surface 2a ₁ facing the bottom surface 1a ₁ of the concave portion 1a, and has a projecting portion 2e on its upper surface 2a _1. The projections 2e has a top surface 2e ₁ facing the side surface 2e ₂ and the cavity leading to the side surface 2a ₂ of the convex portion 2a, and surrounds the entire periphery of the edge portion of the upper surface 2a ₁ 3 It is formed as follows. Protrusion 2e may be formed to surround the part of the edge portion of the upper surface 2a _1.

  In addition, the cavity in this specification means the space part applicable to the molded article (for example, separator of FIGS. 21-23) of a shaping die.

  1 to 3, a mold member 1 includes a hole forming convex portion 1b for forming a hole in a molded product, and a hole forming concave portion 1c for forming another hole in the molded product. have. The concave portion 1a of the mold member 1 is a concave portion surrounding the periphery of the hole forming convex portion 1b, and is also a convex portion surrounding the periphery of the hole forming concave portion 1c.

  The mold member 2 has a hole forming concave portion 2b for forming a hole in the molded product and a hole forming convex portion 2c for forming another hole in the molded product. The convex part 2a of the mold member 2 is a convex part surrounding the periphery of the hole forming concave part 2b, and is also a concave part surrounding the periphery of the hole forming convex part 2c.

  Referring to FIG. 1, the hole forming convex portion 1 b of the mold member 1 is provided corresponding to the hole forming concave portion 2 b of the mold member 2, and the hole forming concave portion 1 c of the mold member 1 is It is provided corresponding to the hole forming convex portion 2 c of the mold member 2.

Referring to FIG. 5, the convex portion 2a of the die member 2, the upper surface 2a ₁ facing the bottom surface 1a ₁ of the recess 1a of the die member 1 has a protrusion 2f. Its projections 2f has a side surface 2f ₂ leading to 2a ₃ (side surface of the hole forming recess 2b) side of the convex portion 2a, and a top surface 2f ₁ facing the cavity. Further, the protrusion 2f is formed so as to surround the entire circumference of the hole forming recess 2b of the mold member 2 as shown in FIG.

Referring to FIG. 6, the recess 1 a of the mold member ₁ has a protrusion ₁ f on the bottom surface 1 a ₁ facing the top surface 2 a ₁ of the protrusion 2 a of the mold member 2. Its projections 1f has a side surface 1f ₂ leading to 1c ₂ (sides of the hole forming recess 1c) side surface of the concave portion 1a, and has a top surface 1f ₁ facing the cavity. Further, the projection 1f is formed so as to surround the entire circumference of the hole forming recess 1c of the mold member 1 as shown in FIG.

1 to 3, the mold member 1 has a flow path forming convex portion 1g for forming a flow channel on one surface of a molded product on the bottom surface 1a _{1 of the} concave portion 1a. Each end of the flow path forming convex portion 1g is formed so as to be connected to the hole forming convex portion 1b as shown in FIG. The flow path forming convex portion 1g is formed on the mold member 1 on the opposite side to the mold member 2 on which the protrusion 2f is formed.

1 to 3, the mold member 2 also has a flow path forming convex portion 2 g for forming a flow channel on the other surface of the molded product on the upper surface 2 a ₁ of the convex portion 2 a. Each of both ends of the flow path forming convex portion 2g is formed so as to be connected to the hole forming convex portion 2c as shown in FIG. The flow path forming convex portion 2g is formed on the mold member 2 on the opposite side to the mold member 1 on which the protruding portion 1f is formed.

7 to 9 are cross-sectional views showing the region R2 in FIG. 1 in an enlarged manner.
In the molding die 10 shown in FIG. 1, in a state in which overlapping the mold member 1 and the mold member 2 so as to correspond to the recess 1a and the convex portion 2a, relative to the bottom surface 1a ₁ of the recess 1a, the convex portion 2a With respect to the relationship between the height H ₁₁ of the upper surface 2a ₁ of the _first surface and the height H ₂₁ of the upper surface 1d ₁ of the convex portion 1d, the height H ₁₁ and the height H ₂₁ are the same as shown in FIG. As shown in FIG. 8, there are a case where the height H ₂₁ is higher than the height H ₁₁ and a case where the height H ₂₁ is lower than the height H ₁₁ as shown in FIG. Of these cases, lower than the height H ₂₁ is the height H _11, as shown in FIG. 9, the upper surface 1d ₁ of the convex portion 1d to the bottom surface 1a ₁ of the concave portion 1a is higher than the upper surface 2a ₁ of the convex portion 2a Is particularly preferred. In this case, it is preferable that the upper surface 1d ₁ of the convex portion 1d is lower by 0.05 mm or more and 0.3 mm or less than the upper surface 2a ₁ of the convex portion 2a.

10 and 11 are enlarged cross-sectional views of the region R3 in FIG.
In the molding die 10 shown in FIG. 1, in a state in which overlapping the mold member 1 and the mold member 2 so as to correspond to the recess 1a and the convex portion 2a, relative to the bottom surface 1a ₁ of the recess 1a, the convex portion 2a As for the relationship between the height H ₁₁ of the upper surface 2a _{1 and} the height H ₂₂ of the upper surface 1b ₁ of the hole forming convex portion 1b, the height H ₁₁ and the height H ₂₂ are the same as shown in FIG. If a, and a case and is higher than the height H ₂₂ is the height H _11, as shown in FIG. 10, lower than the height H ₂₂ is the height H _11, as shown in FIG. 11. Among these cases, as shown in FIG. 11, the height H ₂₂ is lower than the height H ₁₁ , and the upper surface 1b _{1 of the} hole forming convex portion 1b is the upper surface of the convex portion 2a with respect to the bottom surface 1a _{1 of the} concave portion 1a. If less than 2a ₁ is particularly preferred. In this case, it is preferable that the upper surface 1b _{1 of} the hole forming convex portion 1b is lower than the upper surface 2a ₁ of the convex portion 2a by 0.05 mm or more and 0.3 mm or less.

12 and 13 are enlarged cross-sectional views of the region R4 in FIG.
In the molding die 10 shown in FIG. 1, in a state in which overlapping the mold member 1 and the mold member 2 so as to correspond to the recess 1a and the convex portion 2a, with respect to the upper surface 2a ₁ of the convex portion 2a, the recess 1a the height H ₁₂ of the bottom surface 1a ₁ of, for the relationship between the height H ₂₃ of the upper surface 2c ₁ pore-forming convex part 2c, the height H ₁₂ and a height H ₂₃ are the same as shown in FIG. 6 If a, and a case and is higher than the height H ₂₃ is the height H _12, as shown in FIG. 12, lower than the height H ₂₃ is the height H _12, as shown in FIG. 13. Among these cases, the bottom surface of the height H ₂₃ is lower than the height H _12, the upper surface 2c ₁ recess 1a pore-forming convex part 2c with respect to the upper surface 2a ₁ of the convex portion 2a, as shown in FIG. 13 The case where it is lower than 1a ₁ is particularly preferred. In this case, it is preferable that the upper surface 2c _{1 of} the hole forming convex portion 2c is lower by 0.05 mm or more and 0.3 mm or less than the bottom surface 1a _{1 of the} concave portion 1a.

Each of FIGS. 14 to 16 is an enlarged cross-sectional view showing the vicinity of the protrusion 2e shown in each of FIGS. As shown in FIGS. 14 to 16, the connecting side surface 2h ₁ constituted by the side surface 2e ₂ of the projection 2e and the side surface 2a ₂ of the projection 2a is formed from the root (the bottom surface 2d _{1 of the} recess 2d) of the projection 2e. A constant inclination angle may be maintained up to the top surface 2e ₁ .

However, as shown in FIGS. 17 to 19, the connecting side surface 2h ₁ is configured such that the inclination angle changes from the base (the bottom surface 2d _{1 of the} recess 2d) to the top surface 2e ₁ of the protrusion 2e. Preferably it is. Specifically, the connecting side surface 2h ₁ includes a _first side surface portion having an inclination angle α located on the base side (the bottom surface 2d ₁ side of the recess 2d), and the top surface of the protrusion 2e rather than the first side surface portion. 2e ₁ side, and it is preferable that the inclination angle β is larger than the inclination angle α.

  In addition, the inclination angles α and β are preferably angles within a range of 0 ° to 15 °. When the inclination angles α and β exceed 15 °, the outer peripheral portion or the edge portion of the molded product may become large, which affects the design of the molded product. Furthermore, it is more preferable that the inclination angles α and β are angles within a range of 0 ° to 10 °.

Further, each of the connecting side surface 2h ₂ shown in FIGS. 5, 10, and 11 and the connecting side surface 1h shown in FIGS. 6, 12, and 13 is also provided on the root side (recessed portion) as shown in FIGS. The _first side surface portion of the inclination angle α located on the bottom surface 2d ₁ side of 2d or the bottom surface 1c ₁ side of the recess 1c, and the top surface 2f ₁ (or the projection portion 1f) of the projection 2f than the first side surface portion. And a second side surface portion with an inclination angle β located on the top surface 1f ₁ ) side, and the inclination angle β is preferably larger than the inclination angle α. For the same reason as described above, the inclination angles α and β are preferably in the range of 0 ° to 15 °, more preferably 0 ° to 10 °.

The inclination angles α and β are angles formed by the first and second side portions with respect to the normal of the bottom surface 1a ₁ of the recess 1a.

Further, as shown in FIGS. 14 to 19, the height of the protrusion 2e is, for example, 0.3 mm. Also, when higher than the height H ₂₂ is the height H _11, as shown in FIGS. 15 and 18, the height difference between the upper surface 1d ₁ of the top surface 2e ₁ and the convex portion 1d of the protrusion 2e, for example 0.4 mm. In the case lower than the height H ₂₂ is the height H _11, as shown in FIGS. 16 and 19, the height difference between the upper surface 1d ₁ of the top surface 2e ₁ and the convex portion 1d of the protrusion 2e, for example 0.2 mm.

Referring to FIG. 4, the shortest distance b ₁ between the connecting side surface 2h ₁ and the convex portion 1d in a state where the mold member 1 and the mold member 2 are overlapped with each other so that the concave portion 1a and the convex portion 2a correspond to _{each other.} Is preferably smaller than the distance t ₂ between the top surface 1d ₁ of the convex portion 1d and the bottom surface 2d _{1 of the} concave portion 2d.

Referring to FIG. 5, the shortest distance between the connecting side surface 2 h ₂ and the hole forming convex portion 1 b in a state where the concave portion 1 a and the convex portion 2 a are made to correspond to each other and the mold member 1 and the mold member 2 are overlapped. The distance b ₂ is preferably smaller than the distance t ₃ between the upper surface 1b ₁ of the hole forming convex portion 1b and the bottom surface 2b ₁ of the hole forming concave portion 2b.

Referring to FIG. 6, the shortest distance between the connecting side surface 1 h and the hole forming convex portion 2 c in a state where the mold member 1 and the mold member 2 are overlapped with each other so that the concave portion 1 a and the convex portion 2 a correspond to each other. b ₃ is preferably smaller than the distance t ₄ between the bottom surface 1c ₁ of the upper surface 2c ₁ and hole forming recess 1c of the hole forming projection 2c.

  Note that all the corners of the mold members 1 and 2 have a rounded round shape, and the curvature radius R of the round shape is 0.1 mm or more. However, if the radius of curvature R of each part is too large, the separator itself must be enlarged accordingly, and therefore the upper limit value of the radius of curvature of each part is restricted by the size of the separator.

Next, the dimension of each part of this Embodiment is demonstrated.
Referring to FIG. 4, in the state where mold members 1 and 2 are overlapped, the distance (the thickness of the molded product) t ₁ between the upper surface 2a ₁ of the convex portion 2a and the bottom surface 1a _{1 of the} concave portion 1a is 0.5 mm. It is preferable that it is 5.0 mm or less. When this interval (thickness of the molded product) t ₁ is less than 0.5 mm, molding becomes difficult, and the reliability of the molded product, such as strength and gas leakage, is lowered, and there is a possibility that it cannot be used as a molded product. In addition, when the interval (thickness of the molded product) t ₁ exceeds 5.0 mm, the molded product warps or cracks due to thermal shrinkage during cooling after demolding, and the electrical resistance in the penetration direction of the molded product. Tend to be higher. The interval (thickness of the molded product) t ₁ is more preferably 1.0 mm or greater and 3.0 mm or less.

Further, the shortest distance (burr thickness of the molded product) b ₁ between the side surface 2e ₂ of the protrusion 2e and the side surface of the convex portion 1d is preferably 0.03 mm or more and 0.15 mm or less. When this distance (burr thickness of the molded product) b ₁ is less than 0.03 mm, it is difficult to discharge air in the molding material, and voids or the like may be generated in the molded product. If this distance (burr thickness of the molded product) b ₁ exceeds 0.15 mm, the amount of leakage of the molding material increases and the thickness accuracy of the molded product deteriorates. The distance (burr thickness of the molded product) b ₁ is more preferably 0.05 mm or more and 0.1 mm or less.

The width B ₁ of the protrusion 2e is preferably 0.1 mm or more and 0.5 mm or less. When the width B ₁ is less than 0.1 mm, a force that flows in the horizontal direction of the molding material is generated during molding, and the projection 2e may be broken by this force. On the other hand, when the width B ₁ exceeds 0.5 mm, the outer peripheral portion of the molded product or the edge portion of the through-hole portion may become large, which affects the design of the molded product. The width B ₁ is more preferably 0.2 mm or greater and 0.4 mm or less.

The height h ₁ of the protrusion 2e is preferably 0.1 mm or more and 0.5 mm or less. When the height h ₁ is less than 0.1 mm, the burrs of the molded product may be higher than the surface of the molded product, and in this case, deburring is necessary. Further, when the height h ₁ exceeds 0.5 mm, a force that flows in the horizontal direction of the molding material is generated during molding, and the projection 2e may be broken by this force. The height h ₁ is more preferably 0.2 mm or more and 0.3 mm or less.

Referring to FIG. 5, the shortest distance between side surface 1 f ₂ of protrusion 1 f and side surface of recess 1 a (side surface of hole forming recess 1 c) 1 c ₂ in a state where mold members 1 and 2 are overlapped. (Burr thickness of molded product) b ₃ is preferably 0.03 mm or more and 0.15 mm or less, for the same reason as the above shortest distance (burr thickness of molded product) b ₁ , 0.05 mm or more More preferably, it is 0.1 mm or less. Further, the width B ₃ of the protrusion ₁ f is preferably 0.1 mm or more and 0.5 mm or less, and preferably 0.2 mm or more and 0.4 mm or less for the same reason as the width B ₁ of the protrusion 2 e. Is more preferable. The height h ₃ of the protrusion 1f is preferably 0.1 mm or more and 0.5 mm or less, and preferably 0.2 mm or more and 0.3 mm or less for the same reason as the height h ₁ of the protrusion 2e. It is more preferable.

Referring to FIG. 6, the shortest distance (burr thickness of molded product) b between side surface 2f ₂ of projection 2f and side surface of hole forming convex portion 1b in a state where mold members 1 and 2 are overlapped with each other. ₂ is preferably 0.03 mm or more and 0.15 mm or less, and more preferably 0.05 mm or more and 0.1 mm or less, for the same reason as the shortest distance (burr thickness of the molded product) b ₁ described above. preferable. Further, the width B ₂ of the protrusion 2f is preferably 0.1 mm or more and 0.5 mm or less, and preferably 0.2 mm or more and 0.4 mm or less for the same reason as the width B ₁ of the protrusion 2e. Is more preferable. The height h ₂ of the protrusion 2f is preferably 0.1 mm or more and 0.5 mm or less, and preferably 0.2 mm or more and 0.3 mm or less for the same reason as the height h ₁ of the protrusion 2e. It is more preferable.

  Next, the manufacturing method of the separator for fuel cells using the compression mold in this Embodiment is demonstrated.

  FIG. 20 is a schematic cross-sectional view showing a method for producing a fuel cell separator using a molding die according to an embodiment of the present invention. Referring to FIG. 20, a molding material 20a is prepared so as to include at least a conductive carbon material and a resin binder, for example. The resin binder contains, for example, at least one of a thermoplastic resin and a thermosetting resin. This molding material may be in the form of powder, particles, pellets, or the like, or may be in the form of a sheet.

  Examples of the carbon material include artificial graphite, natural graphite, glassy carbon, carbon black, acetylene black, and ketjen black. These carbon materials can be used alone or in combination of two or more. There is no restriction | limiting in particular in the shape of the granular material of these carbon materials, Any of foil shape, scale shape, plate shape, needle shape, spherical shape, an amorphous shape, etc. may be sufficient. In addition, expanded graphite obtained by chemically treating graphite can also be used. Considering the conductivity, artificial graphite, natural graphite, and expanded graphite are preferable in that a separator having a high degree of conductivity can be obtained in a smaller amount.

  Examples of the thermosetting resin include phenol resin, epoxy resin, vinyl ester resin, urea resin, melamine resin, unsaturated polyester resin, silicone resin, diallyl phthalate resin, maleimide resin, and polyimide resin. As the thermosetting resin, not only one resin but also a mixture of two or more resins can be used.

  Examples of the thermoplastic resin include polyethylene, polypropylene, cycloolefin polymer, polystyrene, syndiotactic polystyrene, polyvinyl chloride, ABS resin, polyamide resin, polyacetal, polycarbonate, polyphenylene ether, modified polyphenylene ether, polyethylene terephthalate, polytrimethylene terephthalate. , Polybutylene terephthalate, polycyclohexylene terephthalate, polyphenylene sulfide, polythioether sulfone, polyether ether ketone, polyarylate, polysulfone, polyether sulfone, polyetherimide, polyamideimide, thermoplastic polyimide, liquid crystal polymer, polytetrafluoro Fluorine resins such as ethylene copolymer and polyvinylidene fluoride Wholly aromatic polyester, semi aromatic polyester, polylactic acid, polyester polyester elastomer include thermoplastic elastomers such as polyester-polyether elastomer. Further, similarly to the thermosetting resin, the thermoplastic resin is not limited to one made of one kind of resin, but a mixture of two or more kinds of resins can also be used. Further, a composite of a thermosetting resin and a thermoplastic resin can be used.

  This molding material 20 a is put into the molding die 10 and is pressed between the die member 1 and the die member 2. At this time, the mold members 1 and 2 are heated by a hot platen (not shown), and the molding material 20 a is heated through the mold members 1 and 2. When a thermosetting resin is used as the resin binder, the thermosetting resin is solidified by this heat and pressure. Thereafter, the fuel cell separator (molded product) 20 is taken out from the mold 10. When a thermoplastic resin is used as the resin binder, the thermoplastic resin is melted by the heating and pressing described above.

  When a thermoplastic resin is used for the resin binder, the mold members 1 and 2 are subsequently cooled by a cooling board (not shown). Also during this cooling, the molding material 20 a is pressurized between the mold member 1 and the mold member 2. The thermoplastic resin in a molten state is solidified by this cooling and pressing. Thereafter, the fuel cell separator (molded product) 20 is taken out from the mold 10.

  When the resin binder is made of a thermosetting resin as described above, the molding material 20a is heated and pressurized with the molding die 10 to obtain the fuel cell separator (molded product) 20, but the resin binder is thermoplastic. When made of a resin or made of a thermoplastic resin and a thermosetting resin, the molding material 20a is heated and pressurized and cooled and pressurized by the molding die 10 to obtain a fuel cell separator (molded product) 20.

  The fuel cell separator 20 of the present embodiment obtained through the above compression molding has, for example, the shape shown in FIGS.

  FIG. 21 and FIG. 22 are plan views schematically showing configurations of one surface and the other surface of the fuel cell separator 20, respectively, and FIG. 23 is a schematic cross section taken along line XXIII-XXIII in FIG. 21 and FIG. FIG. Each of FIG. 24 and FIG. 25 is a schematic sectional view showing, in an enlarged manner, each of region Q1 and region Q2 of FIG. 26 is a schematic cross-sectional view taken along line XXVI-XXVI in FIG.

Referring to FIGS. 21 and 22, fuel cell separator 20 has a substantially rectangular planar shape. As shown in FIG. 21, a step portion 21e is formed on one surface 21A of the fuel cell separator 20 so as to surround the entire periphery of the edge of the fuel cell separator. As shown in FIGS. 23 to 25, the stepped portion 21 e is composed of a convex portion 21 e ₁ on the outer peripheral side and a concave portion 21 e ₂ on the inner peripheral side. The convex portion 21e ₁ on the outer peripheral side is a so-called burr.

  Referring to FIGS. 21 and 22, the fuel cell separator 20 has manifold holes 21b and 21c and a gas flow path 21g. As shown in FIG. 21, both ends of a gas flow path 21g formed on one surface 21A of the fuel cell separator 20 are connected to a manifold hole 21b, respectively. Further, as shown in FIG. 22, both ends of the gas flow path 21g formed on the other surface 21B of the fuel cell separator 20 are respectively connected to the manifold holes 21c.

  The bottom surfaces of the gas flow path 21g formed on the one surface 21A and the gas flow path 21g formed on the other surface 21B are flat.

Further, a step portion 21f is formed on the other surface 21B opposite to the one surface 21A (the back surface side) on which the gas flow path 21g connected to the manifold hole 21c is formed so as to surround the periphery of the manifold hole 21c. Is formed. As shown in FIGS. 23 and 24, the step portion 21f includes an inner peripheral convex portion 21f ₁ and an outer peripheral concave portion 21f ₂ .

Further, a step portion 21f is formed on one surface 21A opposite to the other surface 21B (back surface side) on which the gas flow path 21g connected to the manifold hole 21b is formed so as to surround the periphery of the manifold hole 21b. Is formed. As shown in FIGS. 23 and 25, the step portion 21f includes an inner peripheral convex portion 21f ₁ and an outer peripheral concave portion 21f ₂ .

Referring to FIG. 26, the height h of the projection 21f ₁ formed around any of the manifold holes 21b and 21c is smaller than the depth D of the gas flow path 21g.

  A fuel cell can be produced using the fuel cell separator 20 of the present embodiment obtained as described above. The fuel cell includes a fuel cell separator 20 and an electrolyte membrane / membrane assembly. The electrolyte membrane / membrane assembly includes, for example, a fuel electrode, an oxidizer electrode, and a solid polymer electrolyte membrane. A pair of fuel cell separators 20 and 20 are arranged so as to sandwich the electrolyte membrane / membrane assembly, thereby forming a polymer electrolyte fuel cell. The fuel cell of the present embodiment can be used even if it is composed of a single fuel cell, but usually a fuel cell stack in which a plurality of fuel cells are arranged in series for the purpose of improving power generation performance. It is said that.

  The fuel cell separator 20 obtained in the present embodiment is suitable for various fuel cells such as a hydrazine type, a direct methanol type, an alkaline type, and a phosphoric acid type in addition to the solid polymer type fuel cell. Can be applied to.

Next, the effect of this Embodiment is demonstrated.
According to the molding die 10 of the present embodiment, as shown in FIGS. 1 and 4, the molding material is molded by the concave portion 1a of the mold member 1 and the convex portion 2a of the mold member 2, moldings burrs occurs in the direction (upward direction in FIG. 1 and FIG. 4) intersecting the upper surface 2a ₁ of the convex portion 2a. Here, since the protrusion 2e is provided on the edge of the upper surface 2a ₁ of the protrusion 2a, burrs are generated starting from the top surface 2e ₁ of the protrusion. Accordingly, since the starting point of occurrence of burrs can be the cavity side from the upper surface 2a ₁ of the convex portion 2a, that the burr protrudes from the upper surface 2a ₁ of the convex portion 2a can be suppressed more than the conventional example.

In the conventional example, as shown in FIG. 27, since the convex part 121e that becomes a burr is generated starting from the surface 121A of the molded article 121, the convex part 121e protrudes from the surface 121A by the height h of the convex part 121e that becomes a burr. It will be. On the other hand, in the present embodiment, as shown in FIG. 28, a convex portion 21e _{1 serving} as a burr is generated starting from the bottom surface of the concave portion 21e ₂ formed so as to surround the edge portion of the molded product 20. Protruding portion 21e ₁ is suppressed from protruding from surface 21A. Accordingly, in the present embodiment, when the molded products 20 are stacked, the molded products 20 can be sufficiently brought into contact with each other without being obstructed by the convex portion 21e _{1 serving} as a burr.

Further, as shown in FIG. 23, since the burrs of the molded product 20 do not occur in a direction substantially parallel to the upper surface 21A (the left-right direction in FIG. 23), the molded products can be positioned and stacked with good accuracy. It becomes. Further, it is possible burrs be suppressed compared with the prior art that protrude from the upper surface 2a ₁ of the convex portion 2a, complicated deburring unnecessary.

  Further, in the molding die 10 of the present embodiment, as shown in FIGS. 1, 5, and 6, protrusions 2f and 1f are also provided around the hole forming recesses 2b and 1c, respectively. Therefore, the same effect as described above can be obtained.

  Also, if burrs occur on the side where the gas flow path and the manifold hole are connected, there will be burrs between the gas flow path and the manifold hole. The flow of fluid in is obstructed. However, in the present embodiment, as shown in FIGS. 2 and 3, the mold member 2 on the opposite side to the mold member 1 on which the flow path forming convex portion 1g connected to the hole forming convex portion 1b is formed. Further, a projection 2f is formed so as to surround the periphery of the hole forming recess 2b. Thus, since the flow path forming convex part 1g and the protrusion part 2f are formed on the mold members opposite to each other, no burr is generated at the connection part between the gas flow path and the manifold hole. Therefore, the fluid flow is not hindered by the burr.

  Further, as shown in FIGS. 2 and 3, the hole forming recess is formed in the mold member 1 on the opposite side of the mold member 2 on which the flow path forming protrusion 2g connected to the hole forming protrusion 2c is formed. A protrusion 1f is formed so as to surround the periphery of 1c. As described above, since the flow path forming convex portion 1g and the projecting portion 2f are formed on the mold members on the opposite sides, the flow of the fluid is not hindered by the burr.

In the molding die 10 of the present embodiment, as shown in FIG. 9, when the upper surface 1d ₁ of the convex portion 1d is lower than the upper surface 2a _{1 of the} convex portion 2a with respect to the bottom surface 1a ₁ of the concave portion 1a. As shown in FIG. 16, the shortest distance portion between the connecting side surface 2h ₁ and the convex portion 1d is always located within the height range of the protruding portion 2e. As a result, the burr is broken at the shortest distance when demolding, so that the burr is prevented from protruding above the upper surface 2a ₁ of the convex portion 2a. Also in the case of FIG. 11 and FIG. 13, the same effect as described above can be obtained.

In the molding die 10 of the present embodiment, as shown in FIGS. 17 to 19, the connecting side surface 2 h ₁ has a first side surface portion having an inclination angle α and a second side surface portion having an inclination angle β. When the mold is removed, it is difficult for the mold member 2 to come out of the mold member 1 at the first side surface portion with a small inclination angle α, and at the second side surface portion with a large inclination angle β. The mold member 2 can be easily removed from the mold member 1. Thereby, simultaneously with demolding, the burr breaks from the boundary position between the first side surface portion and the second side surface portion. For this reason, the operation | work which removes a burr | flash part after mold removal becomes unnecessary.

In addition, the boundary position between the first side surface portion and the second side surface portion is preferably provided in a portion that is the shortest distance between the connection side surface 2h ₁ and the convex portion 1d.

Further, in the molding die 10 of the present embodiment, as shown in FIG. 4, the shortest distance b between the connecting side surface 2h ₁ and the convex portion 1d in a state where the die member 1 and the die member 2 are overlapped. If ₁ is less than the distance t ₂ of the bottom surface 2d ₁ of the upper surface 1d ₁ and the recess 2d of the convex portion 1d, rather than part of the distance t ₂ is the shortest distance b ₁ of the portion easily crack during demoulding . If the molded product is cracked at the distance t _{2 at} the time of demolding, burrs that protrude greatly in the upward and lateral directions in the figure are generated in the molded product. However, in the configuration of FIG. 4, when the mold is removed, the molded product is broken at the portion of the shortest distance b ₁ , so that the burr generated after the mold removal can be reduced and the burr protrudes upward from the upper surface 2 a _{1 of the} convex portion 2 a. Is suppressed.

In FIG. 5, when the shortest distance b ₂ between the connecting side surface 2h ₂ and the convex portion 1b is smaller than the distance t ₃ between the upper surface 1b ₁ of the hole forming convex portion 1b and the bottom surface 2b ₁ of the hole forming concave portion 2b, and FIG. even if the shortest distance b ₃ of the connecting side 1h and hole forming projection 2c is smaller than the distance t ₄ between the bottom surface 1c ₁ of the upper surface 2c ₁ and hole forming recess 1c of the hole forming projection 2c at 6, The same effect as described above can be obtained.

Further, in the fuel cell separator 20 of the present embodiment, as shown in FIG. 21, the outer peripheral side is formed with a convex portion 21 e ₁ and the inner peripheral side is formed with a concave portion 21 e ₂ so as to surround the entire periphery of the edge portion of the fuel cell separator 20. A stepped portion 21e is formed. Although the convex portion 21e ₁ is a burr, because of the recess 21e ₂ on the inner peripheral side of the burr, the starting point S2 of the burr as shown in FIG. 28 is made from the bottom surface of the recess 21e _2. For this reason, it is suppressed that a burr protrudes from the surface 21A of the separator 20 for fuel cells. For this reason, when stacking the fuel cell separators 20, the fuel cell separators 20 can be sufficiently brought into contact with each other. Further, since the burr of the fuel cell separator 20 does not occur in a direction substantially parallel to the upper surface, the fuel cell separator 20 can be positioned and stacked with good accuracy. Moreover, since it can suppress that a burr | flash protrudes from the surface 21A of the separator 20 for fuel cells, a complicated deburring process becomes unnecessary.

Further, in the fuel cell separator 20 of the present embodiment, as shown in FIGS. 21 and 22, the inner peripheral side is formed with a convex portion 21f ₁ and the outer peripheral side is formed with a concave portion 21f ₂ so as to surround the manifold hole 21b or 21c. A step portion 21f is formed. For this reason, as described above, the protrusion 21f ₁ that is a burr is prevented from protruding from the surface 21A or 21B of the fuel cell separator 20. Therefore, the same effect as described above can be obtained.

In the fuel cell, water is generated from the fuel gas. For this reason, if there is a burr at the connection between the gas flow path 21g and the manifold holes 21b and 21c, the generated water will not easily flow from the gas flow path 21g to the manifold holes 21b and 21c due to the burr. It collects in the road 21g. When the accumulated water mass flows into the adjacent cell, the flow of the fuel gas becomes unstable, and the battery voltage is disturbed. However, in the present embodiment, as shown in FIG. 26, the convex portion 21f _{1 serving} as a burr is formed on the surface opposite to the surface on which the gas flow channel 21g is formed. Burr does not occur at the connection portions with the holes 21b and 21c. Therefore, the above battery voltage is not disturbed.

  Further, according to the method for manufacturing the fuel cell separator 20 of the present embodiment, the molded products 20 can be sufficiently brought into contact with each other, and the molded products 20 can be positioned and stacked with good accuracy, and complicated. A fuel cell separator that does not require any deburring process can be manufactured.

  The mold in the present embodiment may be a compression mold or an injection compression mold.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is used for a fuel cell such as a phosphoric acid fuel cell, a direct methanol fuel cell, and a solid polymer fuel cell, which is applied to a power source for an electric vehicle, a portable power source, an emergency power source, etc. The present invention can be applied particularly advantageously to a method for producing a possible fuel cell separator and a molding die used therefor.

It is sectional drawing which shows schematically the structure of the metal mold | die in one embodiment of this invention. It is a schematic plan view which shows the surface by the side of the shaping of the lower mold | type (mold member 1) of the metal mold | die shown in FIG. It is a schematic plan view which shows the surface by the side of the shaping | molding of the upper mold | type (mold member 2) of the metal mold | die shown in FIG. It is sectional drawing which expands and shows area | region R1 of FIG. It is sectional drawing which expands and shows area | region R3 of FIG. It is sectional drawing which expands and shows area | region R4 of FIG. Is a cross-sectional view showing an enlarged region R2 of FIG. 1 is a diagram showing a case and a height H ₂₁ and a height H ₁₁ are the same. Is a cross-sectional view showing an enlarged region R2 of FIG. 1 is a diagram showing a case greater than the height H ₂₁ is the height H _11. Is a cross-sectional view showing an enlarged region R2 of FIG. 1 is a diagram showing a case lower than the height H ₂₁ is the height H _11. Is a cross-sectional view showing an enlarged region R3 in FIG. 1 is a diagram showing a case greater than the height H ₂₂ is the height H _11. Is a cross-sectional view showing an enlarged region R3 in FIG. 1 is a diagram showing a case lower than the height H ₂₂ is the height H _11. Is a cross-sectional view showing an enlarged region R4 in FIG. 1 is a diagram showing a case greater than the height H ₂₃ is the height H _12. It is a cross-sectional view showing an enlarged region R4 in FIG. 1 is a diagram illustrating a case where the height H ₂₃ is lower than the height H _12. It is sectional drawing which expands and shows the projection part 2e vicinity shown in FIG. It is sectional drawing which expands and shows the projection part 2e vicinity shown in FIG. It is sectional drawing which expands and shows the protrusion part 2e vicinity shown in FIG. It is sectional drawing which expands and shows the protrusion part 2e vicinity shown in FIG. 7, and is a figure which shows the structure which has a 1st and 2nd side part from which a connection side surface differs in an inclination angle. It is sectional drawing which expands and shows the protrusion part 2e vicinity shown in FIG. 8, and is a figure which shows the structure which has a 1st and 2nd side part from which a connection side surface differs in an inclination angle. It is sectional drawing which expands and shows the protrusion part 2e vicinity shown in FIG. 9, and is a figure which shows the structure which has a 1st and 2nd side part from which a connection side surface differs in an inclination angle. It is a schematic sectional drawing which shows the manufacturing method of the separator for fuel cells using the metal mold | die in one embodiment of this invention. 2 is a plan view schematically showing a configuration of one surface of a separator 20 for a fuel cell. FIG. 3 is a plan view schematically showing the configuration of the other surface of the fuel cell separator 20. FIG. It is a schematic sectional drawing which follows the XXIII-XXIII line | wire of FIG. 21 and FIG. It is a schematic sectional drawing which expands and shows the area | region Q1 of FIG. It is a schematic sectional drawing which expands and shows the area | region Q2 of FIG. It is a schematic sectional drawing in alignment with the XXVI-XXVI line of FIG. It is a fragmentary sectional view of the separator for fuel cells for explaining a mode that a burr protrudes upwards from the surface of a separator for fuel cells in a separator for fuel cells of a conventional example. It is a fragmentary sectional view of the separator for fuel cells for explaining that it can control that a burr protrudes upwards from the surface of the separator for fuel cells in the separator for fuel cells in one embodiment of the present invention. It is sectional drawing which shows the structure (a) of the compression mold of the conventional shear edge structure, and the structure (b) of the molded article shape | molded by it. It is sectional drawing which shows the structure (a) of the conventional metal mold | die for compression molding, and the structure (b) of the molded article shape | molded by it.

Explanation of symbols

1 mold member, 1a, 1c, 2d _{recess, 1a 1, 1c 1, 2b} 1, 2d 1 _{bottom, 1b 1, 1d 1, 2a} 1, 2c 1 top, 1b, 2c hole forming projection, 1c, 2b hole forming recess, 1d, 2a protrusion, 1f, 2e, 2f _{projections, 1c 2, 1f 2, 2a} 2, 2a 3, 2e 2, 2f 2 _{side, 1f 1, 2e 1, 2f} 1 top surface, 1g , 2 g passage forming convex part, 1h, 2h _1, 2h ₂ connecting side, second mold member, 10 mold, separator 20 fuel cells (moldings), 20a molding materials, 21A one surface, 21B other surface, 21b, holes for 21c manifold, 21e, 21f stepped portion, 21e _1, 21f ₁ protrusion, 21e _2, 21f ₂ recesses, 21g gas passage.

Claims (3)

A molding die for molding a molding material,
A first mold member having a first recess;
A second mold member having a first convex portion provided corresponding to the first concave portion,
The first convex portion has a protrusion on the upper surface facing the bottom surface of the first concave portion,
The protrusion has a side surface connected to the side surface of the first convex portion and a top surface facing the cavity,
And is formed so as to surround a part or the entire circumference of the edge of the upper surface,
Furthermore, the first mold member has a second convex portion surrounding the first concave portion,
In the state where the first mold member and the second mold member are overlapped with the first convex part and the first concave part corresponding to each other, the upper surface of the second convex part is A molding die, which is located below the top surface of the first convex portion with respect to the bottom surface of the first concave portion. The second mold member has a connecting side surface constituted by a side surface of the first convex portion and a side surface of the protruding portion connected to the side surface of the first convex portion,
The connection side surface includes a first side surface portion, and a second side surface portion located on the top surface side of the projection portion with respect to the first side surface portion,
2. The molding metal according to claim 1, wherein an inclination angle of the second side surface portion with respect to a perpendicular to the bottom surface of the first recess is larger than an inclination angle of the first side surface portion with respect to the perpendicular. Type. The second mold member has a connecting side surface constituted by a side surface of the first convex portion and a side surface of the protruding portion connected to the side surface of the first convex portion,
The first mold member has a second convex portion surrounding the first concave portion;
The second mold member has a second concave portion that surrounds the first convex portion and is provided corresponding to the second convex portion,
In a state where the first mold member and the second mold member are overlapped with each other so that the first convex portion and the first concave portion correspond to each other, the connection side surface and the second convex portion The molding die according to claim 1 or 2, wherein a shortest distance between the second convex portion and the bottom surface of the second concave portion is smaller than a distance between the upper surface and the second convex portion.

Images