WO2023286285A1 - 成型方法及び金型 - Google Patents
成型方法及び金型 Download PDFInfo
- Publication number
- WO2023286285A1 WO2023286285A1 PCT/JP2021/026894 JP2021026894W WO2023286285A1 WO 2023286285 A1 WO2023286285 A1 WO 2023286285A1 JP 2021026894 W JP2021026894 W JP 2021026894W WO 2023286285 A1 WO2023286285 A1 WO 2023286285A1
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- WIPO (PCT)
- Prior art keywords
- groove
- base material
- mold
- molding
- cavity plate
- Prior art date
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- 238000000465 moulding Methods 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 76
- 239000000463 material Substances 0.000 claims abstract description 142
- 239000003566 sealing material Substances 0.000 claims abstract description 77
- 229920001971 elastomer Polymers 0.000 claims abstract description 70
- 239000002994 raw material Substances 0.000 claims description 28
- 239000000758 substrate Substances 0.000 claims description 26
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 239000000123 paper Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 239000012778 molding material Substances 0.000 claims description 2
- 238000004073 vulcanization Methods 0.000 abstract description 42
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 239000004744 fabric Substances 0.000 description 27
- 238000010586 diagram Methods 0.000 description 14
- 238000002347 injection Methods 0.000 description 13
- 239000007924 injection Substances 0.000 description 13
- 238000003825 pressing Methods 0.000 description 13
- 238000004132 cross linking Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000001721 transfer moulding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/14—Sealings between relatively-stationary surfaces by means of granular or plastic material, or fluid
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Definitions
- the present invention relates to a molding method and mold for molding a sealing material on a base material.
- FIG. 6 is a cross-sectional view of a molding machine 1000 that performs conventional transfer molding. is a diagram showing a state in which mold clamping and injection of the rubber fabric 1050 have been performed.
- the molding machine 1000 has hot plates 1010 and 1012 and molds 1020 and 1032 .
- the mold 1020 has a pot 1022 into which the rubber cloth 1050 is charged, a groove 1026 for molding the sealing material on the base material 1040, and a gate 1024 for injecting the rubber cloth 1050 into the groove 1026.
- Mold 1032 has a recess 1033 for placing substrate 1040 .
- the molding machine 1000 After charging the rubber fabric 1050 and arranging the base material 1040, the molding machine 1000 applies a pressure of, for example, 1 MPa to 200 MPa (hereinafter referred to as injection pressure) to the rubber fabric 1050 by mold clamping, and injects the rubber fabric 1050 into the groove 1026. (inject.
- the molding machine 1000 molds a sealing material on a base material 1040 such as a separator by cross-linking a rubber fabric 1050 with heat of, for example, 80° C. to 220° C. generated by a hot plate 1010 .
- Patent Document 1 discloses a method of manufacturing a gasket-integrated plate used for separators of fuel cells, top covers of hard disk drives, and the like.
- some substrates have an inclined portion (hereinafter also referred to as a flange shape) at the end, and the sealing material may be molded near the flange shape of the substrate.
- the present invention has been made in view of the above circumstances, and provides a molding method capable of further reducing the distance between the slanted portion of the base material and the sealing material when molding the sealing material on the base material having the slanted portion.
- An exemplary task is to provide a mold.
- the present invention has the following configurations.
- the base material is sandwiched between the first mold and the second mold in which the raw material is injected into the groove, and the raw material is used as the sealing material at a temperature at which the raw material is vulcanized (crosslinked).
- the first mold has a shape that creates a gap between the base material and the inclined portion of the base material when the base material is pressed against the first plane and the second plane in the second step. , a connecting groove that connects the groove and the shape, The molding method, wherein the groove of the first mold is provided in the vicinity of the shape.
- the present invention it is possible to provide a molding method and mold capable of further reducing the distance between the slanted portion of the base material and the sealing material when molding the sealing material on the base material having the slanted portion.
- FIG. 4 is a cross-sectional view showing the main part of the molding machine in the vulcanization molding process of the embodiment, (a) a diagram showing a state in which a pair of cavity plates and a base material are arranged in the molding machine, and (b) a plurality of molds in the molding machine.
- FIG. 1 A diagram showing a state in which a pair of cavity plates and a base material are arranged, (c) a cross-sectional view showing the base material after molding, and (d) a diagram showing a state in which the inner region of the base material is sealed with a plate.
- FIG. 4 is a view showing the configuration of the cavity plate of the embodiment, (a) a view showing a surface of the cavity plate provided with grooves, (b) a cross-sectional view taken along line AA of (a), (c) (a) Perspective view in the BB arrow cross section (a) A view showing the surface of the sealing material side of the base material having a flange shape formed by molding the sealing material through the preforming process and the vulcanization molding process of the embodiment, (b) CC cross section of (a) (c) Cross-sectional view of the cavity plate, the base material, and the lower mold during the vulcanization molding process corresponding to the C-C cross section of (a), (d) C-C of (a) Sectional view of C (a) A diagram showing a surface of a base material having a flange shape formed by molding a sealing material through a preforming step and a vulcanization molding step of the embodiment, and (b) a DD cross section of (a).
- (c) Cross-sectional view of the cavity plate, the base material, and the lower mold during the vulcanization molding process corresponding to the DD cross section of (a), (d) The main part near the gap Sp , (e) DD cross-sectional view of (a) It is a cross-sectional view of a conventional molding machine, (a) a diagram showing a state in which rubber dough is charged into a pot of the molding machine, (b) a state in which mold clamping and rubber dough injection are performed in the molding machine. diagram showing
- molding refers to the process of shaping rubber without cross-linking, regardless of the use of a mold. refers to the process of making
- the sealing material is rubber
- the material of the rubber fabric is blended and kneaded.
- the rubber used include fluororubber, EPDM, NBR, CR, thermosetting elastics such as silicone, thermoplastic elastics, and thermoplastic resins.
- the kneaded material is then forced into.
- forcing refers to adding a vulcanization accelerator and a vulcanizing agent to a rubber compound and mixing and kneading them.
- the rubber compound (rubber fabric) is also the state in which the raw material rubber and compounding agents such as fillers and cross-linking agents (vulcanizing agents) are uniformly mixed.
- the rubber material is injected (injected) into the grooves of the cavity plate, which will be described later, under a predetermined pressure, and is molded as it is unvulcanized (uncrosslinked). done.
- a step in which molding is performed in an unvulcanized (uncrosslinked) state is referred to as a preforming step.
- vulcanization is performed in a state in which the cavity plate and the base material, in which rubber is injected, are laminated to form a pair.
- a process in which vulcanization (crosslinking) is performed is referred to as a vulcanization molding process.
- the vulcanization molding step also includes the case where the raw material of the sealing material is molded into the base material at a temperature at which the material is vulcanized (crosslinked).
- FIG. 1 is a cross-sectional view showing a molding machine 100 in the preforming process of the present embodiment
- FIG. FIG. 4B is a diagram showing a state in which the rubber material is inserted
- FIG. 4B is a diagram showing a state in which the rubber material 150 is injected into the groove 162 of the cavity plate 160 in the molding machine 100.
- FIG. 1 the vertical direction is indicated by a double arrow. 1 to 3, for the sake of explanation, the substrate is assumed to be a flat plate, and the cavity plate 160 whose shape is determined according to the substrate is also assumed to be a flat plate.
- the molding machine 100 has hot plates 110, 112 and molds 120, 130.
- the mold 120 has a pot 122 into which the rubber dough 150 is charged and a gate 124 for injecting the rubber dough 150 into the groove 162 of the cavity plate 160 .
- the mold 130 has a recess 133 for arranging the cavity plate 160 .
- a cavity plate 160 which is a first mold, has grooves 162 into which the rubber material 150 is injected, grooves (hereinafter referred to as escape grooves) 164 for releasing the rubber material 150 from the grooves 162 in the preforming process or the vulcanization molding process. have.
- the cavity plate 160 also has a connection groove (not shown), which will be described later.
- the rubber dough 150 is loaded into the pot 122, and the cavity plate 160 is placed in the recess 133 of the mold 130. It is assumed that the die 120 (the gate 124) and the die 130 (the groove 162 of the cavity plate 160) are positioned by a known method or the like. Thereafter, as shown in FIG. 1B, pressure (hereinafter also referred to as mold clamping pressure) is applied to the molds 120 and 130 to clamp the molds, and the rubber fabric 150 is injected from the pot 122 through the gate 124. A pressure is applied to inject the rubber cloth 150 into the groove 162 of the cavity plate 160 .
- mold clamping pressure pressure
- the pressure required when injecting the rubber fabric 150 is called injection pressure, which is, for example, 1 to 200 MPa.
- injection pressure which is, for example, 1 to 200 MPa.
- the temperature of the heat generated in the hot plates 110 and 112 during mold clamping shown in FIG. It is the temperature at which (the substance used as the raw material of the sealing material is not crosslinked) and the fluidity is maintained.
- the preforming step is performed at a temperature of 80°C.
- the preforming step can be called an unvulcanized forming step.
- the temperature in the preforming step is not limited to 80° C., and is set according to the viscosity of the rubber dough 150, for example.
- the filling rate of the rubber fabric 150 into the grooves 162 of the cavity plate 160 is, for example, 90% to 110%, but the filling rate is not limited to this value either.
- FIG. 2 is a cross-sectional view showing the essential parts of the molding machine 200 in the vulcanization molding process of the present embodiment.
- FIG. (b) is a diagram showing a state in which a plurality of pairs (for example, three pairs) of cavity plates 160 and substrates 140 are arranged in the molding machine 200;
- (c) is a cross-sectional view showing the substrate 140 after molding;
- (d) is a diagram showing a state in which the plate 180 seals the inner region of the base material 140.
- the reference numerals are omitted.
- the molding machine 200 has hot plates 210 and 212 and a second mold 222 (hereinafter simply referred to as mold 222).
- the base material 140 is metal, resin, or paper, for example.
- the substrate 140 has a surface 142 on which the sealing material 172 is molded and a surface 144 opposite to the surface 142 .
- the surface 142 of the substrate 140 is fitted with the cavity plate 160 having the grooves 162 filled with the rubber material 150 in the preforming process, and the mold 222 is fitted with the surface 144 . That is, the base material 140 is sandwiched between the mold cavity plate 160 and the mold 222 . It is assumed that the cavity plate 160 (the groove 162 filled with the rubber fabric 150) and the base material 140 are positioned by a known method or the like.
- the temperature at which the rubber fabric 150 is vulcanized (cross-linked) (the raw material of the sealing material is cross-linked), for example, 120° C. to 220° C. is heated by hot plates 210 and 212, and the A pressure (eg 5 MPa) is applied.
- the predetermined pressure does not include the injection pressure but only the mold clamping pressure. In other words, the injection pressure in the vulcanization molding process is 0 MPa.
- the rubber fabric 150 in the groove 162 escapes to the escape groove 164 through a connecting groove (not shown), which will be described later.
- the rubber material 150 in the groove 162 may escape to the escape groove 164 during the preforming process.
- FIG. 2(a) is an example in which the vulcanization molding process is performed with a pair of the cavity plate 160 and the base material 140 as one pair, but it is not limited to this.
- three pairs of the cavity plate 160 and the base material 140 may be molded in a single vulcanization molding process to form a plurality of pairs.
- the cavity plate 160 is on the top and the base material 140 is on the bottom, but the top and bottom may be reversed. When turned upside down, the mold 222 becomes an upper mold.
- the rubber material 150 injected into the groove 162 of the cavity plate 160 is transferred (molded) to the surface 142 of the base material 140 as the sealing material 172.
- the sealing material 172 seals the inner area. Gas, liquid, or the like, for example, is retained in the sealed area.
- the vulcanized (cross-linked) part of the rubber fabric 150 that escapes into the escape groove 164 is hereinafter referred to as a side lip 174 .
- the sealing material 172 is provided on the surface 142 of the base material 140, but the sealing material 172 is provided on the surface 144 of the base material 140 and both surfaces (surfaces 142 and 144) of the base material 140. may be provided.
- FIG. AA sectional view (c) is a perspective view in the BB arrow cross section of (a).
- the cavity plate 160 has grooves 162 , escape grooves 164 and connecting grooves 166 .
- the groove 162 is a groove into which the rubber fabric 150 is injected as described above.
- the base material 140 has a rectangular shape with two long sides and two short sides, and the sealing material is molded along the edges of the base material 140 to form a rectangular frame. .
- the groove 162 of the cavity plate 160 is also formed in a rectangular frame shape.
- the groove 162 has a predetermined depth D1 (see FIG. 3(c)).
- the depth D1 of the groove 162 also determines the height of the sealing material molded into the substrate 140.
- the position of the base material 140 and the length and width of the sealing material to be molded are determined according to the intended use of the base material 140 and/or the sealing material. It is not limited to the shape shown.
- the escape groove 164 is provided parallel to the groove 162 with a space therebetween, but it does not have to be parallel.
- the escape groove 164 is formed by the surplus rubber when the rubber material 150 injected into the groove 162 in the vulcanization molding process (or the preforming process) expands during heating and exceeds the volume of the groove 162 to become surplus. It is a groove for escape. That is, by providing the escape groove 164, it is possible to suppress the generation of burrs after the vulcanization molding process.
- the escape grooves 164 are provided between the grooves 162 and the four sides (ends) of the cavity plate 160.
- the escape groove 164 is provided continuously and has a rectangular frame shape like the groove 162 .
- the relief grooves 164 may be provided discontinuously.
- the escape groove 164 is provided at a position that does not interfere with the purpose of using the base material 140 molded with the sealing material 172 .
- the base material 140 on which the sealing material 172 is molded using the cavity plate 160 of FIG. Material 172 is molded.
- an escape groove 164 is provided at a position corresponding to an area outside the sealing material 172 (that is, the edge of the base material 140) where it is not required to maintain hermeticity.
- the escape groove 164 has a predetermined depth D2 (see FIG. 3(c)).
- the depth D2 of the relief groove 164 also determines the height of the side lip 174 .
- the depth D2 of the escape groove 164 is shallower than the depth D1 of the groove 162 (D2 ⁇ D1).
- the height of the side lip 174 is lower than the height of the sealing material 172 .
- the depth D2 of the escape groove 164 whether it is continuous or discontinuous, and the length, width, shape, etc. in the case of discontinuity are not limited to those shown in FIG. / Or, it may be set according to the purpose of use of the sealing material 172 , the viscosity of the rubber fabric 150 , the injection amount, the injection pressure, and the like.
- the connecting groove 166 is a groove for letting the rubber material 150 expanded by heat in the vulcanization molding process (or preforming process) escape to the escape groove 164 .
- the connecting groove 166 is formed to have a depth d of about 0.005 mm to about 0.2 mm, a length L of about 1 to 6 mm, and to be lower than the touch surface 168, for example.
- length L is the length in the direction parallel to groove 162 .
- the depth d of the connecting groove 166 is shallower than the depth D1 of the groove 162 and the depth D2 of the relief groove 164 (d ⁇ D2 ⁇ D1).
- the connecting grooves 166 are discretely provided between the grooves 162 and the relief grooves 164, as shown in FIG. 3(a).
- the position, the number, the width (in other words, the distance between the groove 162 and the escape groove 164), the length L, and the depth d of the connection groove 166 are determined depending on the purpose of using the base material 140 and/or the sealing material 172 and the grooves. 162 and the escape groove 164, the viscosity of the rubber material 150, the position of the gate 124, and the like.
- the cavity plate 160 As a material for the cavity plate 160, a material that can withstand the vulcanization temperature (hereinafter referred to as vulcanization (crosslinking) temperature) in the vulcanization molding process and has good thermal conductivity, such as iron, SUS, aluminum, etc. Metals such as copper are preferred.
- vulcanization (crosslinking) temperature a material that can withstand the vulcanization temperature
- thermal conductivity such as iron, SUS, aluminum, etc.
- Metals such as copper are preferred.
- the material of the cavity plate 160 for example, ceramics, resins, etc. can be used as long as they satisfy the above conditions.
- the cavity plate 160 has a thickness that prevents deformation and maintains rigidity in the preforming process and the vulcanizing process.
- the volumes of the grooves 162 and the relief grooves 164 of the cavity plate 160 are known values when the cavity plate 160 is designed, the amount of excess rubber can be controlled by the relief grooves 164, thereby reducing the occurrence of burrs. can do. Further, since the rubber material 150 is injected in the preforming process, there is no injection pressure when the rubber material 150 is molded into the base material 140 in the vulcanization molding process. Therefore, deformation and breakage of the base material 140 caused by the injection pressure can be reduced. In addition, since injection pressure is not applied in the vulcanization molding process, it is possible to reduce the amount of pressure that is conventionally added to the mold clamping pressure to suppress the occurrence of burrs.
- gate traces remain in transfer molding, injection molding, etc., for example, in the preforming process of the present embodiment, the unvulcanized rubber material 150 is injected into the grooves 162 of the cavity plate 160, so the gate traces can be reduced or eliminated. can be done.
- FIG. 4(a) is a diagram showing the surface of the flange-shaped base material 300 on which the sealing material 172 is formed after the preforming process and the vulcanization process described above
- FIG. 10(a) is a sectional view of the cavity plate 410 corresponding to the CC section
- (c) is a vulcanization molding process corresponding to the CC section of (a).
- FIG. 4D is a sectional view of the mold 420
- (d) is a CC sectional view of (a).
- the substrate 300 includes a first plane 302 (hereinafter simply referred to as plane 302), an inclined portion 304 continuing from plane 302, and a second plane 306 continuing from inclined portion 304 (hereinafter simply referred to as 306).
- the inclined portion 304 is indicated by a double dashed line.
- the flange shape of the base material 300 is formed by a flat surface 302 , an inclined portion 304 and a flat surface 306 .
- the sealing material 172 and the side lip 174 are formed (or formed in the case of the side lip 174) in a region inside the inclined portion 304 indicated by the double dashed line in the base material 300. be done.
- the plane 306 is higher than the plane 302 when the plane 302 is used as a reference (FIG. 4C). , (d)). Also, the plane 306 is provided at the end of the substrate 300 . That is, when the plane 306 is used as a reference for height, the base material 300 has a recessed shape inside the flange shape. A sealing material 172 is provided to keep the recessed area airtight.
- the cavity plate 410 has a groove 462, an escape groove 464, a connecting groove (not shown), and a pressing portion (touch surface portion) 412.
- the groove 462 is a groove for filling (injecting) the rubber fabric 150 that becomes the sealing material 172 .
- the release groove 464 is a groove for releasing the rubber fabric 150 from the groove 462 .
- a connecting groove (not shown) has the same configuration as the connecting groove 166 described in FIG.
- the vulcanized (cross-linked) rubber fabric 150 filling the connecting groove (not shown) is shown as a connecting portion 176 in FIG. 4(a).
- the pressing portion (touch surface portion) 412 is a portion that presses the base material 300 in the vulcanization molding process.
- the mold 420 has a pressing portion (touch surface portion) 422 .
- the pressing portion (touch surface portion) 422 is a portion that presses the base material 300 in the vulcanization molding process.
- the base material 300 is sandwiched between the cavity plate 410 and the mold 420 (which is also the lower mold) and clamped to perform molding.
- the cavity plate 410 and the mold 420 avoid the inclined portion 304 and press the plane 302 inside the inclined portion 304 (dashed ellipse).
- the side lip 174 is formed in a region outside the sealing material 172, which does not affect the performance of the equipment to be assembled and the maintenance of the airtightness.
- a distance S1 (hereinafter referred to as distance S1) is required as a distance from the flange shape of the base material 300, specifically, the connection portion between the flat surface 302 and the inclined portion 304 to the central portion of the sealing material 172.
- the sealing material 172 is formed on the base material 300 by the method shown in FIG.
- the area of the entire substrate 300 must be increased.
- increasing the area of the entire substrate 300 may lead to an increase in the size of the fuel cell. Therefore, it is required to increase the area of the concave region inside the sealing material 172 without increasing the area of the entire base material 300 .
- FIG. 5(a) is a view showing the surface of the flange-shaped base material 300 on which the sealing material 172 is formed after the preforming step and the vulcanization molding step of the present embodiment.
- ) is a sectional view of the cavity plate 510 corresponding to the DD section of (a).
- 5(c) is a cross-sectional view of the cavity plate 510, the base material 300, and the mold 520 during the vulcanization molding process corresponding to the DD cross section of (a), and (d) is a main part near the gap Sp. , and (e) is a DD cross-sectional view of (a).
- a cavity plate 510 which is the first mold of the present embodiment, has a groove 562, a gap forming portion 564, a connecting groove (not shown), and a pressing portion (touch surface portion) 512, as shown in FIG. 5(b). are doing.
- the groove 562 is a groove for filling (injecting) the rubber fabric 150 that becomes the sealing material 172 .
- the gap forming part 564 functions in the same manner as the escape groove 464 in FIG. 4B, and forms a gap Sp, which will be described later, for letting the rubber fabric 150 escape from the groove 562 in the vulcanization molding process (or preforming process). Part to form.
- a connecting groove (not shown) has the same configuration as the connecting groove 166 described in FIG. The connecting groove (not shown) allows the rubber fabric 150 protruding from the groove 562 to escape to the gap Sp generated by the gap forming portion 564 .
- the pressing portion (touch surface portion) 512 is a portion that presses the flat surface 306 of the base material 300 in the vulcanization molding process.
- the pressing portion (touch surface portion) 512 is configured to press the flat surface 306 of the base material 300, but the present invention is not limited to this.
- the position to be arranged and the area in contact with the base material 300 can be set according to the purpose of using the base material 300 and the cavity plate 510, the shape, etc., and the position to arrange the sealing material 172. good.
- the second mold 520 (hereinafter simply referred to as the mold 520) has a shape along the flange shape while providing a clearance with the inclined portion 304 of the base material 300, for example.
- a pressing portion (touch surface portion) 522 is provided at a position facing the pressing portion (touch surface portion) 512 of 510 .
- the shape of the mold 520 is not limited to the shape shown in FIG. 5, and is determined according to the shape of the base material 300 and the cavity plate 510, the pressure during mold clamping in the vulcanization molding process, the temperature during heating, and the like. do it.
- the base material 300 is sandwiched between the cavity plate 510 and the mold 520 (which is also the lower mold) and clamped to perform molding.
- the cavity plate 510 avoids the inclined portion 304 and presses the flat surface 306 outside the inclined portion 304 with the pressing portion 512 (broken-line ellipse).
- the cavity plate 510 is pressing the base material 300, as shown in FIG. An enclosed void Sp results.
- the rubber fabric 150 filled in the grooves 562 expands and escapes into the gap Sp through the connecting grooves (not shown).
- the cavity forming portion 564 is provided in the cavity plate 510, and the flange shape (specifically, the inclined portion 304) of the base material 300 is used to function as an escape groove.
- the rubber material 150 that escapes into the gap Sp becomes the side lip 190 after the vulcanization molding process. Since the side lip 190 is formed on part of the sloped portion 304 and the flat surface 302 of the base material 300 , the sealing material 172 can also be molded at a position closer to the sloped portion 304 .
- the distance S2 is smaller than the distance S1 described in FIG. 4 (S2 ⁇ S1).
- S2 ⁇ S1 the distance S1 described in FIG. 4
- FIG. 5 it is possible to increase the area of the recessed region inside the sealing material 172 of the base material 300 without increasing the overall area of the base material 300 .
- the molding method and the cavity plate 510 are applied to the base material 300 having a flange shape at the end, but the invention is not limited to this.
- the invention is not limited to this.
- it can be applied to the one or more inclined portions. be.
- the present invention includes the following gists.
- the molding method of the present invention is Sealing to said first planar surface of a substrate having a first planar surface, a sloped portion contiguous with said first planar surface, and a second planar surface contiguous with said sloped portion higher than said first planar surface.
- a molding method for molding a material a first step of injecting the raw material into the groove at a temperature at which the raw material is not vulcanized (cross-linked) into a first mold having a groove into which the raw material of the sealing material is injected;
- the base material is sandwiched between the first mold and the second mold in which the raw material is injected into the groove, and the raw material is used as the sealing material at a temperature at which the raw material is vulcanized (crosslinked).
- a second step of molding into a substrate with The first mold has a shape that creates a gap between the base material and the inclined portion of the base material when the base material is pressed against the first plane and the second plane in the second step. , a connecting groove that connects the groove and the shape, The groove of the first mold is provided near the shape.
- the second plane may be provided at an end of the base material.
- the substrate may be metal, resin or paper.
- the raw material may be rubber.
- the mold of the present invention is Sealing to said first planar surface of a substrate having a first planar surface, a sloped portion contiguous with said first planar surface, and a second planar surface contiguous with said sloped portion higher than said first planar surface.
- a mold for molding material a groove into which the raw material of the sealing material is injected at a temperature that does not vulcanize (crosslink); a shape that creates a gap between the base material and the inclined portion when the base material is pressed to mold the raw material injected into the groove as the sealing material on the first plane; a connecting groove that connects the groove and the shape; with The groove is provided near the shape.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
(1)第1の平面と、前記第1の平面に連続する傾斜部と、前記傾斜部に連続する前記第1の平面よりも高い第2の平面と、を有する基材の前記第1の平面にシール材を成型する成型方法であって、
前記シール材の原料が注入される溝を有する第1の金型に、前記原料が加硫(架橋)しない温度で前記溝に前記原料を注入する第1の工程と、
前記溝に前記原料が注入された前記第1の金型と第2の金型との間に前記基材を挟み、前記原料が加硫(架橋)する温度で前記原料を前記シール材として前記基材に成型する第2の工程と、
を備え、
前記第1の金型は、前記第2の工程において前記基材の前記第1の平面及び前記第2の平面を押さえたときに前記基材の前記傾斜部との間に空隙を生じる形状と、前記溝と前記形状とを連結する連結溝と、を有し、
前記第1の金型の前記溝は、前記形状の近傍に設けられる、成型方法。
<シール材付きの基材が完成するまでの流れ>
本実施形態の成形方法の基本的な流れを説明する。シール材が例えばゴムの場合、ゴム生地の材料が配合され混練される。使用されるゴムには、例えば、フッ素ゴム、EPDM、NBR、CR、シリコーン等の熱硬化性弾性体、熱可塑性弾性体、熱可塑性樹脂等が用いられる。次に、混練された材料に促入れが行われる。ここで促入れとは、加硫促進剤、加硫剤をゴムコンパウンドに入れ、混ぜて練ることをいう。なお、原料となるゴムと充填材や架橋剤(加硫剤)等の配合剤が均一に混合された状態もゴムコンパウンド(ゴム生地)という。次に、促入れが行われたゴム生地が分出・成形された後、後述するキャビプレートの溝にゴム生地が所定の圧力で注入(射出)され未加硫(未架橋)のまま成形が行われる。以下の説明において、未加硫(未架橋)のまま成形が行われる工程を予備成形工程という。
第1の工程である予備成形工程について説明する。図1は、本実施形態の予備成形工程における成形機100を示す断面図であり、(a)は成形機100のポット122に、基材に成形されるシール材の原料であるゴム生地150が装入されている状態を示す図、(b)は成形機100においてキャビプレート160の溝162にゴム生地150の注入が行われた状態を示す図である。図1には、上下方向を両矢印で示している。なお、図1~図3では、説明のため基材は平板であるものとし、基材に応じて形状が決定するキャビプレート160も平板であるものとする。
第2の工程である加硫成型工程について説明する。図2は、本実施形態の加硫成型工程における成型機200の要部を示す断面図であり、(a)は成型機200に1対のキャビプレート160及び基材140が配置された状態を示す図、(b)は成型機200に複数対(例えば3対)のキャビプレート160及び基材140が配置された状態を示す図、(c)は成型後の基材140を示す断面図、(d)はプレート180で基材140の内側の領域を密閉した状態を示す図である。図2には、上下方向を両矢印で示している。なお、図2(b)では2対目、3対目は1対目と同じ構成であるため符号を省略している。
キャビプレート160の構成について説明する。図3はキャビプレート160の構成を示す図であり、(a)はキャビプレート160の溝162が設けられている面(以下、タッチ面という)168を示す図、(b)は(a)のA-A断面図、(c)は(a)のB-B矢視断面における斜視図である。キャビプレート160は、溝162、逃がし溝164、連結溝166を有している。
フランジ形状を有する基材にシール材を成型する場合について図4を用いて説明する。図4(a)は上述した予備成形工程及び加硫成型工程を経てシール材172を成形したフランジ形状を有する基材300のシール材172がある側の面を示す図であり、(b)は(a)のC-C断面に対応するキャビプレート410の断面図であり、(c)は(a)のC-C断面に対応する加硫成型工程時のキャビプレート410、基材300、金型420の断面図であり、(d)は(a)のC-C断面図である。
基材300全体の面積を大きくすることなく、シール材172より内側の凹形状の領域の面積を大きくすることができる成型方法及びキャビプレートについて図5を用いて説明する。なお、フランジ形状を有する基材300、シール材172、連結部176の構成は図4と同様であり、同じ符号を用い説明を省略する。図5(a)は本実施形態の予備成形工程及び加硫成型工程を経てシール材172を成型したフランジ形状を有する基材300のシール材172がある側の面を示す図であり、(b)は(a)のD-D断面に対応するキャビプレート510の断面図である。図5(c)は(a)のD-D断面に対応する加硫成型工程時のキャビプレート510、基材300、金型520の断面図であり、(d)は空隙Sp近傍の要部を示す図、(e)は(a)のD-D断面図である。
[趣旨1]
本発明の成型方法は、
第1の平面と、前記第1の平面に連続する傾斜部と、前記傾斜部に連続する前記第1の平面よりも高い第2の平面と、を有する基材の前記第1の平面にシール材を成型する成型方法であって、
前記シール材の原料が注入される溝を有する第1の金型に、前記原料が加硫(架橋)しない温度で前記溝に前記原料を注入する第1の工程と、
前記溝に前記原料が注入された前記第1の金型と第2の金型との間に前記基材を挟み、前記原料が加硫(架橋)する温度で前記原料を前記シール材として前記基材に成型する第2の工程と、
を備え、
前記第1の金型は、前記第2の工程において前記基材の前記第1の平面及び前記第2の平面を押さえたときに前記基材の前記傾斜部との間に空隙を生じる形状と、前記溝と前記形状とを連結する連結溝と、を有し、
前記第1の金型の前記溝は、前記形状の近傍に設けられる。
前記第2の平面は、前記基材の端部に設けられていてもよい。
前記基材は、金属、樹脂又は紙であってもよい。
前記原料は、ゴムであってもよい。
本発明の金型は、
第1の平面と、前記第1の平面に連続する傾斜部と、前記傾斜部に連続する前記第1の平面よりも高い第2の平面と、を有する基材の前記第1の平面にシール材を成型するための金型であって、
加硫(架橋)しない温度で前記シール材の原料が注入される溝と、
前記溝に注入された前記原料を前記第1の平面に前記シール材として成型するために前記基材を押さえたときに、前記基材の前記傾斜部との間に空隙を生じる形状と、
前記溝と前記形状とを連結する連結溝と、
を備え、
前記溝は、前記形状の近傍に設けられる。
110、112、210、212、1010、1012 熱板
120、130、222、420、520、1020、1032 金型
122、1022 ポット
133、1033 凹部
124、1024 ゲート
140、300、1040 基材
142、144 面
150、1050 ゴム生地
160、410、510 キャビプレート(第1の金型)
162、462、562、1026 溝
164、464 逃がし溝
166 連結溝
168 タッチ面
172 シール材
174、190 サイドリップ
176 連結部
180 プレート
302、306 平面
304 傾斜部
412、422、512、522 押圧部
564 空隙形成部
Sp 空隙
Claims (5)
- 第1の平面と、前記第1の平面に連続する傾斜部と、前記傾斜部に連続する前記第1の平面よりも高い第2の平面と、を有する基材の前記第1の平面にシール材を成型する成型方法であって、
前記シール材の原料が注入される溝を有する第1の金型に、前記原料が加硫しない温度で前記溝に前記原料を注入する第1の工程と、
前記溝に前記原料が注入された前記第1の金型と第2の金型との間に前記基材を挟み、前記原料が加硫する温度で前記原料を前記シール材として前記基材に成型する第2の工程と、
を備え、
前記第1の金型は、前記第2の工程において前記基材の前記第1の平面及び前記第2の平面を押さえたときに前記基材の前記傾斜部との間に空隙を生じる形状と、前記溝と前記形状とを連結する連結溝と、を有し、
前記第1の金型の前記溝は、前記形状の近傍に設けられる、成型方法。
- 前記第2の平面は、前記基材の端部に設けられている、請求項1に記載の成型方法。
- 前記基材は、金属、樹脂又は紙である、請求項1又は請求項2に記載の成型方法。
- 前記原料は、ゴムである、請求項1から請求項3のいずれか1項に記載の成型方法。
- 第1の平面と、前記第1の平面に連続する傾斜部と、前記傾斜部に連続する前記第1の平面よりも高い第2の平面と、を有する基材の前記第1の平面にシール材を成型するための金型であって、
加硫しない温度で前記シール材の原料が注入される溝と、
前記溝に注入された前記原料を前記第1の平面に前記シール材として成型するために前記基材を押さえたときに、前記基材の前記傾斜部との間に空隙を生じる形状と、
前記溝と前記形状とを連結する連結溝と、
を備え、
前記溝は、前記形状の近傍に設けられる、金型。
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JP2004225721A (ja) | 2003-01-20 | 2004-08-12 | Nok Corp | ガスケット一体型プレートの製造方法 |
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JP2016091726A (ja) * | 2014-10-31 | 2016-05-23 | パナソニック株式会社 | セパレータ−シール部材接合体及びその製造方法 |
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