Manufacturing method for sealing gasket, and mold
A manufacturing method for a sealing gasket includes the following steps: S 1 , preparing raw material rubber and a first component, wherein the first component comprises a base body and a gluing layer, the gluing layer is attached to an upper surface of the base body; S 2 , placing the first component in an inner cavity of a forming mold, wherein the forming mold comprises an upper mold, a first main body surface of the upper mold is arc shaped, the forming mold further comprises a lower mold, and a second main body surface of the lower mold is arc shaped; S 3 , placing the raw material rubber in the inner cavity of the forming mold; and S 4 , vulcanizing the raw material rubber arranged in the inner cavity of the forming mold, such that the raw material rubber and the first component are integrated.
1 . A method for manufacturing a sealing gasket, comprising following steps:
S 1 : preparing raw material rubber and a first component, wherein the first component comprises a substrate and an adhesive coating layer, the adhesive coating layer is attached to an upper surface of the substrate, and the material of the substrate comprises a lubricating material;
S 2 : placing the first component in an inner chamber of a forming mold, wherein the forming mold comprises an upper mold, the upper mold is provided with a first main body surface which is arc-shaped, and at least part of the first main body surface forms at least part of an upper wall surface of the inner chamber of the forming mold; the forming mold further comprises a lower mold, wherein the lower mold is provided with a second main body surface which is arc-shaped, and at least part of the second main body surface forms at least part of a lower wall surface of the inner chamber of the forming mold; and the adhesive coating layer of the first component faces towards the upper mold of the forming mold;
S 3 : placing the raw material rubber in the inner chamber of the forming mold; and
S 4 : vulcanizing the raw material rubber placed in the inner chamber of the forming mold, such that the raw material rubber and the first component are integrated with each other, wherein
a lower surface of the first component comprises a main body surface and a connecting surface, the connecting surface connects a corresponding side wall of a through hole at the first component, and the connecting surface is inclined.
2 . The method for manufacturing the sealing gasket according to claim 1 , wherein the first component is flexible, the material of the substrate comprises polytetrafluoroethylene, and the first component has a thickness greater than or equal to 0.2 mm and less than or equal to 0.6 mm.
3 . The method for manufacturing the sealing gasket according to claim 1 , wherein in step S 1 , before coating the substrate with an adhesive, a surface treatment is performed on a surface of the substrate for coating; the adhesive coating layer comprises a base adhesive layer and a top adhesive layer, wherein the base adhesive layer is first coated on an upper surface of the substrate, and after the base adhesive layer is dried, the top adhesive layer is coated on a surface of the base adhesive layer and then the top adhesive layer is to be dried.
4 . The method for manufacturing the sealing gasket according to claim 1 , wherein in step S 3 , the method for placing the raw material rubber of a preset specification in the inner chamber of the forming mold comprises the following steps:
placing the raw material rubber of the preset specification into a tank of the forming mold, wherein the tank and the forming mold are located at different sides of a mold partition wall, and the tank is communicated with the inner chamber of the forming mold through a feed port; and
extruding the raw material rubber into the inner chamber of the forming mold through the feed port.
5 . The method for manufacturing the sealing gasket according to claim 1 , wherein in step S 3 , the method for placing the raw material rubber of a preset specification in the inner chamber of the forming mold comprises the following steps:
placing the raw material rubber into a barrel of an injection molding machine, wherein the raw material rubber is pre-heated to a second preset temperature in the barrel of the injection molding machine, and the second preset temperature is lower than or equal to a first preset temperature in step S 4 ; and
injecting, by a screw of the injection molding machine, the raw material rubber in the barrel of the injection molding machine into the inner chamber of the forming mold to reach the preset specification.
6 . The method for manufacturing the sealing gasket according to claim 4 , wherein in step S 4 , the corresponding vulcanization time is defined to be a first preset time, and the corresponding preset temperature is defined to be a first preset temperature, wherein the first preset time is longer than or equal to 3 minutes and shorter than or equal to 5 minutes, and the first preset temperature is higher than or equal to 170° C. and lower than or equal to 200° C.
7 . The method for manufacturing the sealing gasket according to claim 6 , further comprising the following steps:
S 5 : placing a cooled intermediate product in a container, and heating the intermediate product placed in the container, wherein a bonded combination of the vulcanized raw material rubber and the first component is defined as the intermediate product; and maintaining the intermediate product placed in the container at a third preset temperature for a second preset time, so that the intermediate product is secondarily vulcanized, wherein the third preset temperature is lower than the first preset temperature.
8 . The method for manufacturing the sealing gasket according to claim 7 , wherein in step S 6 , the second preset time is longer than or equal to 2 hours and shorter than or equal to 4 hours, and the third preset temperature is higher than or equal to 140° C. and lower than or equal to 160° C.
9 . The method for manufacturing the sealing gasket according to claim 1 , wherein step S 4 further comprises discharging air in the inner chamber of the forming mold at least once.
10 . The method for manufacturing the sealing gasket according to claim 1 , further comprising at least one of the following steps:
S 6 : removing waste material from a product of steps S 1 to S 4 ; and
S 7 : punching at a preset position of the product.
11 . The method for manufacturing the sealing gasket according to claim 10 , wherein
in step 6 , the product is placed in a stamping device, wherein the rubber layer of the sealing gasket is supported on and in contact with a lower stamping die, the first component faces towards an upper stamping die, and a through hole is formed at the preset position of the product through a stamping action of the upper stamping die towards the lower stamping die.
12 . The method for manufacturing the sealing gasket according to claim 2 , wherein in step S 1 , before coating the substrate with an adhesive, a surface treatment is performed on a surface of the substrate for coating; the adhesive coating layer comprises a base adhesive layer and a top adhesive layer, wherein the base adhesive layer is first coated on an upper surface of the substrate, and after the base adhesive layer is dried, the top adhesive layer is coated on a surface of the base adhesive layer and then the top adhesive layer is to be dried.
13 . The method for manufacturing the sealing gasket according to claim 12 , wherein in step S 3 , the method for placing the raw material rubber of a preset specification in the inner chamber of the forming mold comprises the following steps:
placing the raw material rubber of the preset specification into a tank of the forming mold, wherein the tank and the forming mold are located at different sides of a mold partition wall, and the tank is communicated with the inner chamber of the forming mold through a feed port; and
extruding the raw material rubber into the inner chamber of the forming mold through the feed port.
14 . The method for manufacturing the sealing gasket according to claim 12 , wherein in step S 3 , the method for placing the raw material rubber of a preset specification in the inner chamber of the forming mold comprises the following steps:
placing the raw material rubber into a barrel of an injection molding machine, wherein the raw material rubber is pre-heated to a second preset temperature in the barrel of the injection molding machine, and the second preset temperature is lower than or equal to a first preset temperature in step S 4 ; and
injecting, by a screw of the injection molding machine, the raw material rubber in the barrel of the injection molding machine into the inner chamber of the forming mold to reach the preset specification.
15 . The method for manufacturing the sealing gasket according to claim 2 , wherein in step S 3 , the method for placing the raw material rubber of a preset specification in the inner chamber of the forming mold comprises the following steps:
placing the raw material rubber of the preset specification into a tank of the forming mold, wherein the tank and the forming mold are located at different sides of a mold partition wall, and the tank is communicated with the inner chamber of the forming mold through a feed port; and extruding the raw material rubber into the inner chamber of the forming mold through the feed port;
or,
placing the raw material rubber into a barrel of an injection molding machine, wherein the raw material rubber is pre-heated to a second preset temperature in the barrel of the injection molding machine, and the second preset temperature is lower than or equal to a first preset temperature in step S 4 ; and injecting, by a screw of the injection molding machine, the raw material rubber in the barrel of the injection molding machine into the inner chamber of the forming mold to reach the preset specification.
16 . The method for manufacturing the sealing gasket according to claim 5 , wherein in step S 4 , the corresponding vulcanization time is defined to be a first preset time, and the corresponding preset temperature is defined to be a first preset temperature, wherein the first preset time is longer than or equal to 3 minutes and shorter than or equal to 5 minutes, and the first preset temperature is higher than or equal to 170° C. and lower than or equal to 200° C.