Method of manufacturing a gasket and mold

Abstract

A manufacturing method of a sealing gasket, comprising the following steps: S1: preparing raw rubber and a first part; the first part comprises a base body and a rubber coating layer attached to the upper surface of the base body; the material of the base body comprises lubricating material; S2: placing the first part in the inner cavity of a forming mold; the forming mold comprises an upper mold, the first main surface of the upper mold is arc-shaped, and the first main surface at least partially constitutes at least part of the upper wall surface of the inner cavity of the forming mold; the forming mold further comprises a lower mold, the second main surface of the lower mold is arc-shaped, and the second main surface at least partially constitutes at least part of the lower wall surface of the inner cavity of the forming mold; the rubber coating layer of the first part faces the upper mold; S3: placing the raw rubber in the inner cavity of the forming mold; S4: vulcanizing the raw rubber placed in the inner cavity of the forming mold, so that the raw rubber is integrated with the first part; the application also provides a mold which can be used as a carrier for forming a sealing gasket which simultaneously considers sealing performance and reduces the friction of relative moving parts.

Description

[0001] This application claims priority to Chinese Patent Application No. 202110314327.6, filed on March 24, 2021, entitled "Method and Mold for Manufacturing Sealing Gasket", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of sealing component manufacturing technology, specifically to a method for manufacturing a sealing gasket and a mold. Background Technology

[0003] Gaskets are widely used as sealing components. Gaskets are made of materials including rubber. Typically, the sealing function of gaskets mainly relies on the elasticity of rubber. In some applications, there are moving parts that move relative to the gasket. This causes friction between the surfaces of the gasket and the moving parts, which may affect the movement of the moving parts. Therefore, how to manufacture a sealing component that can simultaneously achieve sealing and reduce friction relative to moving parts, as well as the corresponding mold, are technical issues that need to be considered. Summary of the Invention

[0004] The purpose of this application is to provide a method for manufacturing a sealing gasket that can produce a sealing gasket that simultaneously achieves sealing and reduces friction between relatively moving parts.

[0005] The purpose of this application is also to provide a mold for use as a carrier for manufacturing the aforementioned seal.

[0006] To achieve the above objectives, one embodiment of this application adopts the following technical solution:

[0007] A method for manufacturing a sealing gasket includes the following steps:

[0008] S1: Prepare the raw material rubber and the first component; the first component includes a matrix and a coating layer, the coating layer being attached to the upper surface of the matrix; the material of the matrix includes a lubricating material;

[0009] S2: The first component is placed in the inner cavity of the molding die; the molding die includes an upper die, the upper die having a first main body surface that is arc-shaped, the first main body surface at least partially forming at least a portion of the upper wall surface of the inner cavity of the molding die; the molding die also includes a lower die, the lower die having a second main body surface that is arc-shaped, the second main body surface at least partially forming at least a portion of the lower wall surface of the inner cavity of the molding die; the adhesive layer of the first component faces the upper die of the molding die;

[0010] S3: Place the raw rubber material into the inner cavity of the molding die;

[0011] S4: Vulcanize the raw material rubber placed in the inner cavity of the molding mold, so that the raw material rubber and the first component are integrated.

[0012] A mold for use as a carrier for manufacturing the aforementioned seal, the mold comprising a lower mold and an upper mold, the lower mold and the upper mold being closed to form at least one inner cavity, the inner cavity including a receiving cavity for accommodating raw materials required for molding the seal; the upper mold having a first main body surface, the first main body surface being arc-shaped, the first main body surface at least partially constituting at least a portion of the upper wall surface of the inner cavity of the mold; the lower mold having a second main body surface, the second main body surface being arc-shaped, the second main body surface at least partially constituting at least a portion of the lower wall surface of the inner cavity of the mold.

[0013] In the gasket manufacturing method disclosed in this application, the above-mentioned method enables the gasket to achieve a sealing function by, on the one hand, the vulcanized raw rubber has elasticity; on the other hand, since the material of the matrix in the first component includes a lubricating material, it is beneficial to reduce the friction of the relatively moving parts. Therefore, by the above-mentioned gasket manufacturing method, a gasket that simultaneously achieves sealing and reduces the friction of the relatively moving parts can be manufactured.

[0014] In the mold disclosed in this application, the upper mold has a first main body surface, which is arc-shaped and at least partially constitutes at least part of the upper wall surface of the inner cavity of the mold; the mold also includes a lower mold, which has a second main body surface, which is arc-shaped and at least partially constitutes at least part of the lower wall surface of the inner cavity of the mold; thus, on the one hand, the mold can serve as a carrier for manufacturing the aforementioned sealing gasket, and on the other hand, the main body of the sealing gasket manufactured by the mold is arc-shaped, thereby improving the matching degree between the manufactured sealing element and the sealing element in actual use. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating the first embodiment of the method for manufacturing the sealing gasket in this application;

[0016] Figure 2 This is a flowchart illustrating the second embodiment of the method for manufacturing the sealing gasket in this application;

[0017] Figure 3 This is a flowchart illustrating the third embodiment of the gasket manufacturing method in this application;

[0018] Figure 4 This is a flowchart illustrating the fourth embodiment of the gasket manufacturing method in this application;

[0019] Figure 5This is a schematic diagram of the physical process corresponding to the fourth embodiment of the gasket manufacturing method in this application;

[0020] Figure 6 This is a three-dimensional structural diagram of the sealing gasket in this application;

[0021] Figure 7 This is a three-dimensional structural diagram of the upper mold of the mold in this application;

[0022] Figure 8 This is a three-dimensional structural diagram of the lower mold of the mold in this application. Detailed Implementation

[0023] The present application will be further described below with reference to the accompanying drawings and specific embodiments:

[0024] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. First, it should be noted that the directional terms such as up, down, left, right, front, back, inner, outer, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the corresponding drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0025] See Figure 1 , Figure 1 This is the first embodiment of the method for manufacturing a sealing gasket; the first embodiment of the method for manufacturing a sealing gasket is described below.

[0026] See Figure 1 The manufacturing method of the sealing gasket includes the following steps:

[0027] S1: Prepare raw material rubber and first component; the first component includes a matrix and a coating layer, the coating layer is attached to the upper surface of the matrix; the material of the matrix includes a lubricating material; in this embodiment, the matrix can be a plastic layer, and the lubricating material can be mainly polytetrafluoroethylene (PTFE). Of course, as in other embodiments, the lubricating material can also be mainly a copolymer of a small amount of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene (PFA).

[0028] S2: The first component is placed in the inner cavity of the molding die. The molding die includes an upper die with a first main body surface that is arc-shaped and at least partially forms the upper wall surface of the inner cavity of the molding die. The molding die also includes a lower die with a second main body surface that is arc-shaped and at least partially forms the lower wall surface of the inner cavity of the molding die. The lower surface of the substrate of the first component is in contact with the second main body surface, and the adhesive layer of the first component faces the upper die of the molding die. That is, the upper surface of the adhesive layer of the first component serves as the bonding surface. In this embodiment, the lower surface of the substrate of the first component is used to contact external moving parts.

[0029] S3: Place the raw rubber of the preset specifications into the inner cavity of the molding mold, and the raw rubber placed in the inner cavity of the molding mold comes into contact with the adhesive layer of the first component.

[0030] S4: The raw material rubber placed in the inner cavity of the molding mold is vulcanized, the vulcanized raw material rubber comes into contact with the second main body surface, and the vulcanized raw material rubber is bonded to the coating layer of the first component as a whole.

[0031] In this way, on the one hand, the vulcanized raw rubber is elastic, which enables the sealing gasket to achieve a sealing effect; on the other hand, since the material of the matrix in the first component includes a lubricating material, it is beneficial to reduce the friction of the relatively moving parts. Therefore, by the above-described method of manufacturing the sealing gasket, a sealing gasket that simultaneously achieves both sealing and reduces the friction of the relatively moving parts can be manufactured.

[0032] The following will provide a more detailed description of each of the above processes.

[0033] See Figure 1 In this embodiment, the first component is flexible, and the thickness of the first component is greater than or equal to 0.2 mm and less than or equal to 0.6 mm. For example, the thickness of the first component can be 0.4 mm or 0.5 mm. In this embodiment, if the thickness of the first component is too thick, it may affect the sealing. If the thickness of the first component is too thin, it may easily wrinkle and deform in step S4. In addition, it should be noted that the values ​​mentioned in this application can be accurate values ​​or rounded values. Furthermore, the coverage area of ​​the raw rubber corresponding to the first component is less than or equal to the surface area of ​​the adhesive layer of the first component.

[0034] See Figure 1 In this embodiment, in process S1, the material of the substrate includes polytetrafluoroethylene, and the first component is flat.

[0035] In step S1, before applying adhesive to the substrate of the first component, the surface of the substrate to be coated with adhesive is treated. Specifically, this can be done by sodium naphthalene treatment or polishing, which helps to improve the adhesion between the adhesive layer and the substrate of the first component. The adhesive layer can include a base layer and a top layer. The base layer is first applied to the upper surface of the substrate. After the base layer dries, the top layer is applied to the surface of the base layer and then dried. The "drying" mentioned here can be natural air drying or assisted drying, such as oven drying or air drying. In this embodiment, the base layer is applied so that the adhesive can reliably bond to the substrate of the first component, and the top layer is applied so that the dried base layer and the vulcanized rubber can reliably bond. In this embodiment, the base layer and the top layer are different types of adhesives. Of course, as another embodiment, only one layer of adhesive can be applied to the upper surface of the substrate, which corresponds to only one type of adhesive.

[0036] In step S3, the method for placing the raw rubber of a preset specification into the inner cavity of the molding die includes the following two methods: The first method: The raw rubber of the preset specification is placed into the material groove of the molding die, and the pressure column of the vulcanizing machine forces the raw rubber in the material groove into the feed inlet of the inner cavity of the molding die, thereby forcing the raw rubber into the inner cavity of the molding die through the feed inlet. In this embodiment, before placing the raw rubber of the preset specification into the material groove of the molding die, the material groove of the molding die has a certain temperature, which is less than or equal to the first preset temperature in step S4; the pressure used to force the raw rubber into the inner cavity of the molding die is greater than or equal to 8 MPa and less than or equal to 10 MPa.

[0037] The second method involves placing the raw rubber into the barrel of an injection molding machine. The raw rubber is preheated to a second preset temperature within the barrel, which is less than or equal to a first preset temperature. Then, the screw of the injection molding machine injects the raw rubber from the barrel into the gate of the molding die, allowing it to flow into the die's cavity. Injection stops when the amount of raw rubber injected into the die reaches a preset weight. Of course, other methods can also be used to place raw rubber of a preset size into the die's cavity.

[0038] In addition, in the two methods mentioned above, the raw material rubber with preset specifications refers to the raw material rubber with preset weight. Of course, as other embodiments, the raw material rubber with preset specifications can also refer to the raw material rubber with preset volume, preset capacity, or preset size.

[0039] In process S4, the corresponding vulcanization time is defined as the first preset time, and the corresponding preset temperature is defined as the first preset temperature. The first preset time is greater than or equal to 3 min and less than or equal to 5 min, and the first preset temperature is greater than or equal to 170℃ and less than or equal to 200℃.

[0040] In process S4, maintaining the vulcanization temperature of the raw rubber and the first component placed in the inner cavity of the molding mold at the first preset temperature includes the following three methods: In the first method, the raw rubber and the first component in the inner cavity of the molding mold are heated to reach the first preset temperature; In the second method, the mold cavity of the molding mold has already reached the first preset temperature before the raw rubber and the first component are placed in the molding mold; In the third method, the mold cavity of the molding mold already has a certain temperature, which is lower than the first preset temperature, before the raw rubber and the first component are placed in the mold cavity of the molding mold, and then the raw rubber and the first component in the inner cavity of the molding mold are heated to reach the first preset temperature.

[0041] In process S4, the gas inside the molding mold cavity is vented at least once; this helps prevent pores in the final manufactured sealing gasket. Specific operations can include the following methods: First method: By opening the upper and / or lower mold of the molding mold, creating a gap between them, the gas inside the molding mold cavity can be vented through the gap. After a preset time, the upper and lower molds are closed. The number of times the upper and / or lower molds are opened for venting can be one or more. If the number of times the upper and / or lower molds are opened for venting is more than one, the number can be set according to the time or the amount of glue injected. Second method: By installing an external vent valve and setting vent holes on the molding mold, the vent holes are connected to the vent valve. The vent valve vents the gas inside the molding mold cavity, eliminating the need to open the upper and / or lower molds, thus saving manufacturing time. Third method: By evacuating the inside of the molding mold.

[0042] See Figure 2 , Figure 2 This is a second embodiment of the method for manufacturing a sealing gasket; the second embodiment of the method for manufacturing a sealing gasket will be described in detail below.

[0043] See Figure 2 In this embodiment, the method for manufacturing the sealing gasket includes steps S1-S5. Steps S1-S4 can be referred to the first embodiment, and will not be described in detail here.

[0044] See Figure 2In this embodiment, the method for manufacturing the sealing gasket further includes the following steps:

[0045] S5: Define the raw rubber and the first component as an intermediate bonded together and undergoing vulcanization. Place the cooled intermediate in a container and heat the intermediate in the container. Within a second preset time, keep the intermediate in the container at a third preset temperature, thereby causing the intermediate to undergo secondary vulcanization. The third preset temperature is lower than the first preset temperature. Cooling the intermediate here helps to make the molecular motion of the rubber relatively stable. The cooling method here can be natural air cooling, or other methods such as wind cooling or water cooling.

[0046] In the above-mentioned process S5, the second preset time is greater than or equal to 2 hours and less than or equal to 4 hours, and the third preset temperature is greater than or equal to 140°C and less than or equal to 160°C. Secondary vulcanization is beneficial for further improving the mechanical properties of the rubber. Of course, in other embodiments, secondary vulcanization may not be performed; in this case, the vulcanization time, vulcanization temperature, and other parameters of the primary vulcanization can be adjusted accordingly. See [link to documentation]. Figure 3 , Figure 3 This is a third embodiment of the gasket manufacturing method; the third embodiment of the gasket manufacturing method will be described in detail below.

[0047] See Figure 3 In this embodiment, the method for manufacturing the sealing gasket includes steps S1-S4, step S6 and step S7. Steps S1-S4 can be referred to the first embodiment, and will not be described in detail here.

[0048] See Figure 3 In this embodiment, the method for manufacturing the sealing gasket further includes the following steps:

[0049] S6: Remove excess edge material from the sealing gasket;

[0050] S7: Punch holes at preset positions on the gasket; In this embodiment, the gasket includes multiple through holes, which are arranged through the gasket along its thickness direction. Through holes are formed by punching holes at preset positions on the gasket.

[0051] It should be noted that process S7 can be called the punching process.

[0052] In this embodiment, step S6 is performed first, followed by step S7; however, in other embodiments, step S7 may be performed first, followed by step S6. Furthermore, in this embodiment, the method for manufacturing the sealing gasket includes two steps, S6 and S7; however, in other embodiments, it may include only one of steps S6 and S7.

[0053] Additionally, before performing step S6, the intermediate material undergoing secondary vulcanization can be cooled, which helps to stabilize the molecular motion of the rubber. The cooling method can be natural air cooling, or other methods such as wind cooling or water cooling. Alternatively, cooling can be performed after step S6 or step S7.

[0054] See Figure 4 , Figure 4 This is the fourth embodiment of the gasket manufacturing method; the fourth embodiment of the gasket manufacturing method will be described in detail below.

[0055] See Figure 4 In this embodiment, the method for manufacturing the sealing gasket includes steps S1-S7. Steps S1-S5 can be referred to the second embodiment, and will not be described in detail here.

[0056] See Figure 4 In this embodiment, the method for manufacturing the sealing gasket further includes the following steps:

[0057] S6: Remove excess edge material from the sealing gasket;

[0058] S7: Punch holes at preset positions on the gasket; In this embodiment, the gasket includes multiple through holes, which are arranged through the gasket along its thickness direction. Through holes are formed by punching holes at preset positions on the gasket.

[0059] Specifically, in process S7, the sealing gasket is placed in the stamping device, wherein the rubber layer of the sealing gasket is supported by the lower stamping die and in contact with the lower stamping die, the first component faces the upper stamping die, and a through hole is formed at the preset position of the sealing gasket by the stamping action of the upper stamping die toward the lower stamping die; the sealing gasket with the through hole is closed around the through hole.

[0060] In this embodiment, step S6 is performed first, followed by step S7; however, in other embodiments, step S7 may be performed first, followed by step S6. Furthermore, in this embodiment, the method for manufacturing the sealing gasket includes two steps, S6 and S7; however, in other embodiments, it may include only one of steps S6 and S7.

[0061] Additionally, before performing step S6, the intermediate material undergoing secondary vulcanization can be cooled, which helps to stabilize the molecular motion of the rubber. The cooling method can be natural air cooling, or other methods such as wind cooling or water cooling. Alternatively, cooling can be performed after step S6 or step S7.

[0062] See Figure 5 , Figure 5 A physical schematic diagram corresponding to the fourth embodiment of the method for manufacturing the sealing gasket is shown.

[0063] See Figure 5 The first product 1 after processes S1-S5 includes a first component 11 bonded to the raw material rubber and a raw material rubber 12 after vulcanization. Of course, in the gasket manufacturing methods of the first and third embodiments, the first product 1 can also be produced by processes S1-S4. The first product 1 after the above-mentioned process S6 is the second product 2. The second product 2 after the above-mentioned process S7 is the final gasket 3.

[0064] See Figure 6 The lower surface of the first component 11 includes a main body surface 111 and a connecting surface 112. The connecting surface 112 connects to the side wall of the through hole 30 corresponding to the first component. The connecting surface 112 is inclined along the thickness direction of the sealing gasket 3. The side wall of the through hole 30 corresponding to the first component 11 is lower than the main body surface 111. This helps to prevent the moving part from scratching the peripheral wall of the through hole 30 during movement, thereby affecting the movement of the moving part. In this embodiment, the connecting surface 112 is formed by forming a mold in process S4.

[0065] This application also discloses a mold used as a carrier for processes S2, G1, S3, G1', and S4. See [link to relevant documentation]. Figure 7 and Figure 8 The mold includes a lower mold 4 and an upper mold 5. The lower mold 4 and the upper mold 5 are closed to form at least one inner cavity, which includes a receiving cavity for accommodating the raw materials required for molding the sealing gasket. The upper mold 5 has a first main body surface 51, which is arc-shaped and at least partially constitutes at least part of the upper wall surface of the inner cavity of the mold. The lower mold 4 has a second main body surface 41, which is arc-shaped and at least partially constitutes at least part of the lower wall surface of the inner cavity of the mold. Here, "arc-shaped" means approximately arc-shaped. In this way, the mold can serve as a carrier for manufacturing the sealing gasket, and the main body of the sealing gasket manufactured by the mold is arc-shaped, thereby improving the matching degree between the manufactured sealing element and the sealing element in actual use.

[0066] See Figure 7The upper mold 5 also includes multiple first protrusions 52 and grooves 50. Of course, in other embodiments, there may be only one or more other numbers of second protrusions and grooves 50. The first protrusions 52 are provided to protrude from the first main body surface 51, and the grooves 50 are provided to recess from the first main body surface 51. The grooves 50 are located outside the first protrusions 52. The first protrusions 52 have a first inclined surface 521, which is located on the periphery of the first protrusions 52. The first inclined surface 521 connects the top surface of the first protrusions 52 and the root of the first protrusions 52. The top surface of the first protrusions 52 is placed towards the first... The root of the protrusion 52 is projected orthographically, and the top surface of the first protrusion 52 is projected within the root of the first protrusion 52. In this embodiment, the groove 50 includes a first groove 501 and a second groove 502. The first groove 501 is arranged along the length direction of the upper mold 5, and the second groove 502 is arranged along the width direction of the upper mold 5. The first groove 501 and the second groove 502 are arranged in a crisscross pattern. In this embodiment, the first protrusion 52 is surrounded by a portion of the first groove 501 and a portion of the second groove 502. The first groove 501 and the second groove 502 surround the first protrusion 52.

[0067] See Figure 8 The lower mold 4 also includes a plurality of second protrusions 42. Of course, in other embodiments, there may be only one or more other numbers of second protrusions. The second protrusions 42 are provided to protrude from the second main body surface 41. The second protrusions 42 have a second inclined surface 421, which is located on the periphery of the second protrusions 42. The second inclined surface 421 connects the top surface of the second protrusions 42 and the root of the second protrusions 42. The top surface of the second protrusions 42 is projected onto the root of the second protrusions 42, and the projection of the top surface of the second protrusions 42 is located inside the root of the second protrusions 42. This allows a sealing gasket to be formed during molding. Figure 6 The connecting surface 112 is shown.

[0068] It should be noted that the above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. Although this specification has described this application in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to this application. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. A method for manufacturing a sealing gasket, characterized in that: The process includes the following steps: S1: Prepare the raw material rubber and the first component; the first component includes a matrix and a coating layer, the coating layer being attached to the upper surface of the matrix; the material of the matrix includes a lubricating material; S2: The first component is placed in the inner cavity of the molding die; the molding die includes an upper die, the upper die having a first main body surface that is arc-shaped, the first main body surface at least partially forming at least a portion of the upper wall surface of the inner cavity of the molding die; the molding die also includes a lower die, the lower die having a second main body surface that is arc-shaped, the second main body surface at least partially forming at least a portion of the lower wall surface of the inner cavity of the molding die; the adhesive layer of the first component faces the upper die of the molding die; S3: Place the raw rubber material into the inner cavity of the molding die; S4: Vulcanize the raw material rubber placed in the inner cavity of the molding mold, so that the raw material rubber and the first component are integrated; After step S4, the method for manufacturing the gasket also includes the step of punching holes at predetermined positions on the gasket to form through holes; The lower surface of the first component includes a main surface and a connecting surface. The connecting surface connects to the side wall corresponding to the through hole at the first component. The connecting surface is inclined along the thickness direction of the sealing gasket. The side wall corresponding to the through hole at the first component is lower than the main surface. The connecting surface is formed by the molding die in process S4.

2. The method for manufacturing a sealing gasket according to claim 1, characterized in that: The first component is flexible, and the substrate material includes polytetrafluoroethylene; the thickness of the first component is greater than or equal to 0.2 mm and less than or equal to 0.6 mm.

3. The method for manufacturing a sealing gasket according to claim 1, characterized in that: In step S1, before applying adhesive to the substrate, the surface of the substrate to be coated with adhesive is surface treated; the adhesive layer includes a base adhesive layer and a top adhesive layer. The base adhesive layer is first applied to the upper surface of the substrate. After the base adhesive layer dries, the top adhesive layer is applied to the surface of the base adhesive layer and then dried.

4. The method for manufacturing a sealing gasket according to claim 1, characterized in that: The first component is flexible, and the substrate material includes polytetrafluoroethylene; the thickness of the first component is greater than or equal to 0.2 mm and less than or equal to 0.6 mm; In step S1, before applying adhesive to the substrate, the surface of the substrate to be coated with adhesive is surface treated; the adhesive layer includes a base adhesive layer and a top adhesive layer. The base adhesive layer is first applied to the upper surface of the substrate. After the base adhesive layer dries, the top adhesive layer is applied to the surface of the base adhesive layer and then dried.

5. The method for manufacturing a sealing gasket according to any one of claims 1 to 4, characterized in that: In step S3, the method of placing the raw rubber of the preset specifications into the inner cavity of the molding die includes the following steps: placing the raw rubber block of the preset specifications into the material groove of the molding die, wherein the material groove and the molding die are located on different sides of the mold partition wall, the material groove and the inner cavity of the molding die are connected through the feed port, and the raw rubber is extruded into the inner cavity of the molding die through the feed port by the extrusion process.

6. The method for manufacturing a sealing gasket according to any one of claims 1 to 4, characterized in that: In process S4, the corresponding vulcanization time is defined as the first preset time, and the corresponding preset temperature is defined as the first preset temperature. The first preset time is greater than or equal to 3 min and less than or equal to 5 min, and the first preset temperature is greater than or equal to 170℃ and less than or equal to 200℃. In step S3, the method of placing the raw rubber of a preset specification into the inner cavity of the molding die includes the following steps: placing the raw rubber into the barrel of the injection molding machine, preheating the raw rubber in the barrel of the injection molding machine to a second preset temperature, the second preset temperature being less than or equal to the first preset temperature, and the screw of the injection molding machine injecting the raw rubber in the barrel of the injection molding machine into the inner cavity of the molding die to the preset specification.

7. The method for manufacturing a sealing gasket according to claim 6, characterized in that: The method for manufacturing the sealing gasket further includes the following steps: S5: Define the raw material rubber and the first component as an intermediate bonded together and vulcanized, place the cooled intermediate in a container, and heat the intermediate placed in the container; for a second preset time, keep the intermediate placed in the container at a third preset temperature, thereby causing the intermediate to be vulcanized a second time. The third preset temperature is lower than the first preset temperature.

8. The method for manufacturing a sealing gasket according to claim 7, characterized in that: In process S5, the second preset time is greater than or equal to 2 hours and less than or equal to 4 hours, and the third preset temperature is greater than or equal to 140°C and less than or equal to 160°C.

9. The method for manufacturing a sealing gasket according to any one of claims 1 to 4, characterized in that: In step S4, the gas inside the mold cavity is discharged at least once.

10. The method for manufacturing a sealing gasket according to claim 5, characterized in that: In step S4, the gas inside the mold cavity is discharged at least once.

11. The method for manufacturing a sealing gasket according to claim 6, characterized in that: In step S4, the gas inside the mold cavity is discharged at least once.

12. The method for manufacturing a sealing gasket according to claim 7, characterized in that: In step S4, the gas inside the mold cavity is discharged at least once.

13. The method for manufacturing a sealing gasket according to claim 8, characterized in that: In step S4, the gas inside the mold cavity is discharged at least once.

14. The method for manufacturing a sealing gasket according to claim 1, characterized in that: Between step S4 and the punching step, the method for manufacturing the sealing gasket further includes: S6: Remove excess edge material from the sealing gasket.

15. The method for manufacturing a sealing gasket according to claim 14, characterized in that: In the punching process, the sealing gasket is placed in a stamping device, wherein the rubber layer of the sealing gasket is supported by the lower stamping die and in contact with the lower stamping die, the first component faces the upper stamping die, and a through hole is formed at a preset position of the sealing gasket by the stamping action of the upper stamping die toward the lower stamping die.

16. A mold for use as a carrier for steps S2, S3 and S4 of claim 1, the mold comprising a lower mold and an upper mold, the lower mold and the upper mold being joined to form at least one inner cavity, the inner cavity including a receiving cavity for receiving raw materials required for molding the sealing gasket; the upper mold having a first main body surface, the first main body surface being arc-shaped, the first main body surface at least partially constituting at least a portion of the upper wall surface of the inner cavity of the mold; the lower mold having a second main body surface, the second main body surface being arc-shaped, the second main body surface at least partially constituting at least a portion of the lower wall surface of the inner cavity of the mold.

17. The mold according to claim 16, characterized in that: The upper mold further includes at least one first protrusion and a groove. The first protrusion protrudes from the first main body surface, and the groove is recessed from the first main body surface. The groove is located outside the first protrusion. The first protrusion has a first inclined surface, which is located on the periphery of the first protrusion. The first inclined surface connects the top surface of the first protrusion and the root of the first protrusion. Projecting the top surface of the first protrusion onto the root of the first protrusion, the projection of the top surface of the first protrusion is located within the root of the first protrusion.

18. The mold according to claim 16 or 17, characterized in that: The lower mold further includes at least one second protrusion, which protrudes from the second main body surface. The second protrusion has a second inclined surface located on the periphery of the second protrusion. The second inclined surface connects the top surface of the second protrusion and the root of the second protrusion. The top surface of the second protrusion is projected onto the root of the second protrusion, and the projection of the top surface of the second protrusion is located inside the root of the second protrusion.

Images