Processing die and processing method of aerospace electric connector conical hole interface sealing gasket

Abstract

The present application belongs to the field of rubber part processing, and particularly relates to a processing die and a processing method for a sealing gasket of a conical hole interface of an aerospace electric connector. The processing die comprises an upper die and a lower die, the lower surface of the upper die and the upper surface of the lower die are both provided with a die cavity; the die cavities of the upper die and the lower die are closed to form a rubber part cavity. The processing die improves a conventional parting surface (Fig. 2), sets the parting surface (Fig. 1) and a knife edge in the upper die cavity, avoids the sealing gasket boss, improves the product conical hole damage, the different sizes of the hole, burrs and other problems, increases the air tightness between the sealing gasket and the plug, reduces the influence of air medium on electronic components, and improves the production efficiency of the product and reduces the manufacturing cost.

Description

Technical Field

[0001] This invention belongs to the field of rubber parts processing, and in particular relates to a processing mold and processing method for a tapered hole interface sealing gasket for aerospace electrical connectors. Background Technology

[0002] In the processing and manufacturing industries of rubber, plastics, and metal products, flash often forms at the joints between molds, affecting product quality. Flash, also known as overflow, burrs, or imperfections, mostly occurs at the parting points of the mold, such as the parting surface between the moving and stationary molds, the sliding parts of the slider, the gaps between inserts, and the gaps in ejector pin holes. Flash is largely caused by the failure of the mold or machine clamping force. Generally speaking, flash generated by injection molding is difficult to avoid.

[0003] Manned spaceflight is one of the most complex systems engineering projects in human history. Among them, electrical connectors and optical connectors are connectors that use optical fibers as the connection medium to transmit optical signals, mainly for high-speed data transmission. The function of the interface gasket is to compress the interface gasket after the plug is fully inserted, eliminate the air medium at the insertion interface, and improve the high pressure resistance of the connector. The sealing requirements of the gasket are particularly high.

[0004] An application entitled "A Molding Mold for a Porous Rubber Stopper" (Patent Application No.: 202121370074.6, Application Date: June 18, 2021) discloses a molding mold for a porous rubber stopper. The molding mold, arranged from top to bottom, includes an injection stopper, an upper mold, a middle mold, and a lower mold, as well as a mold core for forming holes in the porous rubber stopper. Connecting gaps are formed between the injection stopper and the upper mold, between the middle mold and the lower mold, and between the mold core and the upper and middle molds respectively. These gaps are used to form flash for the overall structure. The upper mold has a cavity and injection holes corresponding to the process holes, and the middle mold has mounting holes. This utility model molding mold, after the rubber stopper is formed, can remove the small flash at the ends of multiple process holes in one go by tearing off the overall flash at both ends, thereby improving the production efficiency of rubber stoppers.

[0005] This method of removing burrs as a whole can meet the high-quality requirements of ordinary rubber components. However, since burrs are close to the sealing surface, the sealing surface is easily damaged when removing burrs, resulting in breakage. Therefore, it cannot meet the sealing requirements when used for high-precision rubber components. Summary of the Invention

[0006] 1. The technical problem that the invention aims to solve

[0007] The existing technology places the cutting edge at the conical opening position that serves as the sealing surface. This makes the product very easy to damage during deburring, causing the boss to break and affecting the sealing of the aerospace wiring harness connector.

[0008] 2. Technical Solution

[0009] To address the aforementioned issues, this invention improves the parting surface, ensuring that the conical boss working surface is free of burrs and damage after demolding. This increases the airtightness between the sealing gasket and the plug, reduces the impact of air on electronic components, improves product quality and production efficiency, and lowers manufacturing costs.

[0010] The technical solution adopted in this invention is as follows: a processing mold for a conical hole interface sealing gasket of an aerospace electrical connector is designed, including an upper mold and a lower mold, which together form a product cavity; the lower mold has a cylindrical mold core at its center, and a lower mold cavity for generating conical bosses is provided around the mold core; the part of the upper mold that forms the product cavity is a frustum-shaped upper mold cavity; the surface of the upper mold cavity serves as the parting surface between the upper and lower molds, and the parting surface is far away from the lower mold cavity.

[0011] Furthermore, tearing edges are respectively provided on the inner and outer ring edges of the parting surface: a countersunk hole matching the mold core is reserved in the center of the upper mold cavity as an inner tearing edge, and an outer tearing edge is provided on the edge of the upper mold cavity offset outwards, with the inner and outer tearing edges far away from the lower mold cavity of the conical boss.

[0012] Furthermore, the product filling the product cavity is a frustum-like sealing gasket with a through hole in the middle, and the sealing gasket has a conical boss at the center of the front side for sealing the interface of the conical hole.

[0013] Furthermore, the upper surface of the frustum of the sealing gasket body has rounded corners.

[0014] Furthermore, the gap between the inner tear edge and the mold core is approximately 0.6 mm, and the countersunk hole depth of the inner tear edge is approximately 1.0 mm.

[0015] Furthermore, the height of the tearing rib protrusion inside the inner tearing edge blade is approximately 1.0 mm.

[0016] Furthermore, the diameter of the outer tear edge is 0.8~1.5mm, and the edge of the tear edge is 0.1~0.3mm away from the cavity.

[0017] Furthermore, the diameter of the outer tear edge is 1.0 mm, and the edge of the edge is 0.2 mm away from the cavity.

[0018] The processing method for the processing mold described in this invention comprises the following steps:

[0019] (1) Install the upper mold and lower mold on the injection molding vulcanizing machine, set the mold temperature to 150~170℃, and after the temperature is reached, fill the product cavity with rubber material, apply pressure of 10~20MPa to close the mold and lock the mold.

[0020] (2) Vacuuming and exhausting;

[0021] (3) After vulcanization for 4-6 minutes, open the mold and remove the frustum sealing gasket of the product;

[0022] (4) Pull the product's tear strips to quickly remove the burrs left at the parting surface;

[0023] (5) Secondary treatment: heat treatment at 200℃ for 2 hours.

[0024] 3. Beneficial effects

[0025] The technical solution provided by this invention has the following significant effects:

[0026] (1) A processing mold and processing method for a tapered hole interface sealing gasket of an aerospace electrical connector. A parting surface and tearing edge are provided on the upper mold of the mold away from the sealing surface, avoiding the sealing gasket boss. This improves the problems of damaged tapered hole, inconsistent hole size, burrs, etc., increases the airtightness between the sealing gasket and the plug, reduces the influence of air medium on electronic components, and also improves the production efficiency of the product and reduces the manufacturing cost.

[0027] (2) The processing mold of the present invention has a reserved waste edge of 0.6mm and a tear edge rib height of 1.0mm, which has sufficient strength to effectively prevent the flash from breaking inside the mold and facilitate removal. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the mold closing structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the existing mold-closing structure;

[0030] Figure 3 This is a schematic diagram of the sealing gasket product of the present invention.

[0031] Explanation of the labels in the schematic diagram: sealing gasket 100; tapered boss 101; through hole 102; rounded corner edge 103; product cavity 104; upper mold 200; lower mold 300; mold core 311; lower mold cavity 301; parting surface 400; inner tear edge cutter 201; outer tear edge cutter 303. Detailed Implementation

[0032] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0033] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0034] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] like Figure 1 A processing mold for a conical hole interface sealing gasket of an aerospace electrical connector has mold cavities on both the lower surface of the upper mold 200 and the upper surface of the lower mold 300; the mold cavities are closed to form a rubber part cavity 104. This processing mold utilizes traditional parting surfaces ( Figure 2 The improvement involves placing the parting surface 400, the inner tear edge 201, and the outer tear edge 303 in the upper mold cavity, avoiding the conical boss 101 of the sealing gasket. This improves the product's tapered opening, addresses issues such as uneven opening size, and burrs. It also increases the airtightness between the sealing gasket and the plug, reduces the impact of air on electronic components, and improves production efficiency while reducing manufacturing costs.

[0037] After the mold parting surface is adjusted, a tear strip is still needed for quickly removing flash. Therefore, an inner tear strip 201 is set in the middle of the upper mold cavity. This can actually be regarded as a small overflow outlet. The overflowing glue forms a tear strip, which can effectively prevent the flash formed by the mold parting gap from breaking off in the mold cavity, and at the same time, it can quickly remove the flash. The gap between the inner tear strip 201 and the mold core 311 is about 0.6mm, and the countersunk hole depth of the inner tear strip 201 is about 1.0mm.

[0038] Meanwhile, an outer tear edge 303 is offset outward from the edge of the upper mold cavity, and both the inner and outer tear edge slits are far away from the lower mold cavity 301 of the conical boss. Preferably, the outer tear edge slit 303 has a diameter of 1.5 mm, and the edge of the slit is 0.1 mm away from the cavity.

[0039] Traditional parting surfaces are designed to be flat at the mold closing point, so they are usually set on the lower mold. However, this does not fully consider that the boss at that point is a sealing surface, and even a slight burr can affect the sealing performance of the product.

[0040] The above-mentioned method for machining the tapered hole interface sealing gasket of the electrical connector using mold processing has the following steps:

[0041] (1) Install the upper mold and the lower mold on the vulcanizing machine, set the mold temperature to 170℃, and after the temperature is reached, fill the product cavity 104 with rubber material, apply pressure of 10MPa to close the mold and lock the mold.

[0042] (2) Vacuuming and exhausting;

[0043] (3) After vulcanization for 5 minutes, open the mold and remove the product;

[0044] (4) Remove excess waste edges and burrs from the product;

[0045] (5) Secondary treatment: heat treatment at 200℃ for 2 hours.

[0046] The electrical connector tapered bore interface sealing gasket obtained in this embodiment has the following performance:

[0047] (1) The product has no broken bosses, no burrs or excess material, the product qualification rate is increased by 50%, the production efficiency is increased by 15%, and the cost is reduced by about 23%;

[0048] (2) The product has good dimensional stability, with critical dimension ppk≥1.8;

[0049] Example 2

[0050] like Figure 1 Compared to Example 1, the difference in this example is that the material is changed to nitrile rubber. Furthermore, tear-off edges are provided on the inner and outer edges of the parting surface 400: a countersunk hole matching the mold core 311 is reserved in the center of the upper mold cavity as an inner tear-off edge 201; an outer tear-off edge 303 is provided off-center from the outer edge of the upper mold cavity; and the inner and outer tear-off edges are far from the lower mold cavity 301 of the tapered boss forming the product sealing surface.

[0051] Preferably, the gap between the inner tear edge cutter 201 and the mold core 311 is approximately 0.3 mm, and the countersunk depth of the inner tear edge cutter 201 is approximately 1.0 mm. The height of the tear edge rib protrusion inside the inner tear edge cutter 201 is approximately 1.0 mm. The diameter of the outer tear edge cutter 303 is 1.0 mm, and the edge of the cutter is 0.2 mm away from the cavity.

[0052] The above-mentioned method for machining the tapered hole interface sealing gasket of aerospace electrical connector using mold processing has the following steps:

[0053] (1) Install the upper mold and the lower mold on the vulcanizing machine, set the mold temperature to 155℃, and after the temperature is reached, fill the product cavity 104 with rubber material, apply pressure of 20MPa to close the mold and lock the mold.

[0054] (2) Vacuuming and exhausting;

[0055] (3) After vulcanization for 6 minutes, open the mold and remove the product;

[0056] (4) Remove excess waste edges and burrs from the product;

[0057] The aerospace electrical connector tapered hole interface sealing gasket obtained in this embodiment has the following performance:

[0058] (1) The product bosses are undamaged, burrs and excess material are quickly removed, the product qualification rate is increased by 45%, the production efficiency is increased by 17%, and the cost is reduced by about 20%;

[0059] (2) The product has good dimensional stability, with key dimensions ppk≥1.5;

[0060] Example 3

[0061] like Figure 1 Compared to Example 2, the difference in this example is that the material is changed to ethylene propylene rubber; furthermore, the upper surface of the frustum of the main body of the sealing gasket 100 is rounded at the corner 103. Preferably, the gap between the inner tear edge 201 and the mold core 311 is about 0.6 mm, and the countersunk depth of the inner tear edge 201 is about 1.0 mm. The height of the tear edge rib protrusion inside the inner tear edge 201 is about 1.0 mm. The diameter of the outer tear edge 303 is 0.8 mm, and the edge of the rib is 0.3 mm away from the cavity.

[0062] The above-mentioned method for machining the tapered hole interface sealing gasket of aerospace electrical connector using mold processing has the following steps:

[0063] (1) Install the upper mold and the lower mold on the vulcanizing machine, set the mold temperature to 160℃, and after the temperature is reached, fill the product cavity 104 with rubber material, apply pressure of 15MPa to close the mold and lock the mold.

[0064] (2) Vacuuming and exhausting;

[0065] (3) After vulcanization for 5 minutes, open the mold and remove the product;

[0066] (4) Remove excess waste edges and burrs from the product;

[0067] (5) Secondary treatment: heat treatment at 150℃ for 4 hours.

[0068] The aerospace electrical connector tapered hole interface sealing gasket obtained in this embodiment has the following performance:

[0069] (1) such as Figure 3As shown, the product filled in the product cavity 104 is a frustum-shaped sealing gasket 100 with a through hole 102 in the middle. The sealing gasket 100 has a conical boss 101 at the center of its front side, which is used to seal the interface of the conical hole.

[0070] (2) The product has no broken bosses, no burrs or excess material, the product qualification rate is increased by 47%, the production efficiency is increased by 15%, and the cost is reduced by about 22%;

[0071] (3) The product has good dimensional stability, with critical dimension ppk≥1.6;

[0072] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A processing mold for a tapered hole interface sealing gasket of an aerospace electrical connector, comprising an upper mold (200) and a lower mold (300), wherein the upper mold (200) and the lower mold (300) together form a product cavity (104), characterized in that: The lower mold (300) has a cylindrical mold core (311) at its center, and a lower mold cavity (301) for generating a conical boss is provided around the mold core (311). The portion of the upper mold (200) that encloses the product cavity (104) is a frustum-shaped upper mold cavity; The surface of the upper mold cavity is the parting surface (400) of the upper and lower molds, and the parting surface (400) is away from the lower mold cavity (301). The inner and outer ring edges of the parting surface (400) are respectively provided with tearing edge cutting edges: the center of the upper mold cavity is reserved with a countersunk hole that matches the mold core (311) as the inner tearing edge cutting edge (201), and the edge of the upper mold cavity is offset to the outer ring to provide an outer tearing edge cutting edge (303). Both the inner and outer tearing edge cutting edges are far away from the lower mold cavity (301) of the conical boss. The product filling the product cavity (104) is a frustum-like sealing gasket (100) with a through hole (102) in the middle. The sealing gasket (100) has a conical boss (101) at the center of the front side for sealing the interface of the conical hole.

2. The mold according to claim 1, characterized in that: The upper surface of the frustum of the main body of the sealing gasket (100) is rounded (103).

3. The mold according to claim 1, characterized in that: The gap between the inner tear edge cutter (201) and the mold core (311) is about 0.6 mm, and the depth of the countersunk hole of the inner tear edge cutter (201) is about 1.0 mm.

4. The mold according to claim 3, characterized in that: The height of the tearing rib protrusion inside the inner tearing edge cutter (201) is about 1.0 mm.

5. The mold according to claim 1, characterized in that: The diameter of the outer tear edge (303) is 0.8~1.5mm, and the edge of the edge is 0.1~0.3mm away from the cavity.

6. The mold according to claim 5, characterized in that: The outer tear edge (303) has a diameter of 1.0 mm and the edge of the edge is 0.2 mm away from the cavity.

7. A processing method using the processing mold according to any one of claims 1 to 6, comprising the following steps: (1) Install the upper mold (200) and lower mold (300) on the injection molding vulcanizing machine, set the mold temperature to 150~170℃, and after the temperature is reached, fill the product cavity (104) with rubber material, apply pressure of 10~20MPa to close the mold and lock the mold. (2) Vacuuming and exhausting; (3) After vulcanization for 4~6 minutes, open the mold and take out the product-type frustum sealing gasket (100). (4) Pull the product's tear strips to quickly remove the burrs left at the parting surface; (5) Secondary treatment: heat treatment at 200℃ for 2 hours.

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