Sealing gasket die

Abstract

The sealing gasket mold comprises an upper mold core and a lower mold core, a hard rubber groove in which hard rubber is clamped is formed between the upper mold core and the lower mold core, and a soft rubber forming cavity communicating with an injection molding hole is further formed between the upper mold core and the lower mold core; a piece of thin steel used for forming the hard rubber groove and the soft rubber forming cavity is formed between the hard rubber groove and the soft rubber forming cavity, the thin steel is arranged on the lower die core, a decompression groove matched with the thin steel is formed in the side edge, attached to the thin steel, of the hard rubber, and the decompression groove can relieve pressing force from the hard rubber borne by the thin steel. And a communicating groove for communicating the decompression groove with the soft rubber forming cavity is reserved between the top end of the thin steel and the upper mold core. The mold can solve the problem that cracks are generated due to long-term uneven stress of the thin steel.

Description

Technical Field

[0001] The present application relates to the technical field of molds, and in particular to a sealing gasket mold. Background Art

[0002] Sealing gaskets are widely used in the automobile lamp manufacturing industry. Sealing gaskets for automobile lamps are made by double injection molding of soft and hard rubber. The hard rubber is injected first, and then the hard rubber is clamped in the mold as an insert. The mold is then closed and soft rubber is injected into the mold to finally produce a sealing gasket with soft rubber on the outside and hard rubber on the inside.

[0003] The above-mentioned mold includes an upper mold core and a lower mold core, a hard rubber groove for clamping hard rubber is provided between the upper mold core and the lower mold core, and a soft rubber molding cavity connected to the injection hole is also provided between the upper mold core and the lower mold core. A thin steel is formed between the hard rubber groove and the soft rubber molding cavity for molding the hard rubber groove and the soft rubber molding cavity. When injecting soft rubber, one side of the thin steel is subjected to and only subjected to the pressing force from the hard rubber, and the other side is subjected to the injection pressure. Since the injection pressure is much greater than the pressing force from the side of the hard rubber, the two sides of the thin steel are subjected to long-term unbalanced force, resulting in cracks at the root of the thin steel, causing cracks in the soft rubber part of the produced sealing gasket, affecting the qualified rate of the sealing gasket. Utility Model Content

[0004] In order to solve the problem of cracks caused by uneven stress on thin steel for a long time, the present application provides a sealing gasket mold.

[0005] The present application provides a sealing gasket mold adopting the following technical solution:

[0006] A sealing gasket mold comprises an upper mold core and a lower mold core, a hard glue groove with hard glue engaged therein is provided between the upper mold core and the lower mold core, a soft glue molding cavity connected to an injection hole is also provided between the upper mold core and the lower mold core, a piece of thin steel for molding the hard glue groove and the soft glue molding cavity is formed between the hard glue groove and the soft glue molding cavity, the thin steel is arranged on the lower mold core, a decompression groove adapted to the thin steel is opened on the side of the hard glue bonded to the thin steel, the decompression groove can relieve the pressing force from the hard glue on the thin steel, and a connecting groove connecting the decompression groove and the soft glue molding cavity is left between the top end of the thin steel and the upper mold core.

[0007] By adopting the above-mentioned technical scheme, the present application relieves the pressing force exerted on the thin steel by the vertical side of the hard rubber by slotting the side of the hard rubber that is in contact with the thin steel, and at the same time opens a connecting groove connecting the decompression groove and the soft rubber molding cavity between the top of the thin steel and the upper mold core. When the soft rubber is injected, the soft rubber flows into the soft rubber molding cavity, the connecting groove and the decompression groove in sequence. Without affecting the product quality, the pressure on both sides of the thin steel is balanced, thereby avoiding cracks at the root of the thin steel, thereby improving the qualified rate of the sealing gasket.

[0008] Optionally, the soft glue molding cavity is triangular in shape, and a side soft glue flow channel is connected between the soft glue molding cavity and the injection hole. The side soft glue flow channel is arranged between the upper mold core and the lower mold core. The side soft glue flow channel is set to two, which are directly connected to two longer side cavities of the three side cavities corresponding to the three sides of the soft glue molding cavity.

[0009] By adopting the above technical solution, the present application sets up two side soft glue channels, and injects soft glue through the two side soft glue channels at the same time, thereby improving the injection molding efficiency, shortening the plastic process, and avoiding plastic solidification.

[0010] Optionally, the side soft glue flow channel includes a main flow channel connected to the injection port and a plurality of branch flow channels connected between the main flow channel and the soft glue molding cavity.

[0011] By adopting the above technical solution, the present application further improves the injection molding efficiency by providing a main channel and multiple branch channels for injection molding into the soft rubber molding cavity.

[0012] Optionally, the branch channels are arranged at intervals along the side cavity direction of the soft rubber molding cavity.

[0013] By adopting the above technical solution, the branch channels in the present application are arranged at intervals along the side cavity direction of the soft rubber molding cavity, thereby further improving the injection molding efficiency.

[0014] Optionally, a central soft glue flow channel is connected between the soft glue molding cavity and the injection hole. The central soft glue flow channel is arranged between the upper mold core and the lower mold core and is directly connected to the central cavity of the soft glue molding cavity.

[0015] By adopting the above technical solution, the present application improves the injection molding efficiency of the central area of ​​the soft glue molding cavity by connecting the central soft glue flow channel between the soft glue molding cavity and the injection hole.

[0016] Optionally, the central soft glue flow channel includes a central flow channel connected to the injection hole and a plurality of side flow channels connected to the central flow channel and the central cavity of the soft glue molding cavity.

[0017] Optionally, the number of side flow channels is three.

[0018] Optionally, the three side flow channels are directly connected to the area of ​​the central cavity of the soft glue molding cavity where more glue injection is required.

[0019] By adopting the above technical solution, the present application sets up three side flow channels, and the three side flow channels are directly connected to the area in the center of the soft glue molding cavity where more glue injection is required, thereby further improving the injection efficiency of the center area of ​​the soft glue molding cavity and saving injection time.

[0020] In summary, the present application includes at least one of the following beneficial technical effects:

[0021] 1. The present application releases the pressing force of the hard rubber on the thin steel by slotting the side of the hard rubber that is in contact with the thin steel, and at the same time, opens a connecting groove between the top of the thin steel and the upper mold core to connect the decompression groove and the soft rubber molding cavity. When the soft rubber is injected, the soft rubber flows into the soft rubber molding cavity, the connecting groove and the decompression groove in sequence, so that the pressure on both sides of the thin steel is balanced without affecting the product quality, avoiding cracks at the root of the thin steel, thereby improving the qualified rate of the sealing gasket;

[0022] 2. The present application sets up two side soft glue channels, and injects soft glue through the two side soft glue channels at the same time, thereby improving the injection molding efficiency, shortening the plastic process, and avoiding plastic solidification; the present application improves the injection molding efficiency of the central area of ​​the soft glue molding cavity by connecting the central soft glue flow channel between the soft glue molding cavity and the injection hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application;

[0024] Figure 2 It is a schematic diagram showing the structure of thin steel according to an embodiment of the present application.

[0025] In the figure, 1, lower mold core; 2, hard rubber groove; 3, hard rubber; 31, decompression groove; 4, soft rubber molding cavity; 5, thin steel; 6, connecting groove; 7, side soft rubber flow channel; 71, main flow channel; 72, branch flow channel; 8, center soft rubber flow channel; 81, center flow channel; 82, side flow channel. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-2 This application is described in further detail.

[0027] The embodiment of the present application discloses a sealing gasket mold.

[0028] like Figure 1 and Figure 2 As shown, a sealing gasket mold comprises an upper mold core (not shown in the figure) and a lower mold core 1, a hard glue groove 2 is provided between the upper mold core and the lower mold core 1, a hard glue 3 is engaged in the hard glue groove 2, a soft glue molding cavity 4 connected to the injection hole is also provided between the upper mold core and the lower mold core 1, a raised thin steel 5 is formed between the hard glue groove 2 and the soft glue molding cavity 4, which is used to mold the hard glue groove 2 and the soft glue molding cavity 4, the thin steel 5 is arranged on the lower mold core 1, and a decompression groove 31 adapted to the thin steel 5 is opened on the side of the hard glue 3 attached to the thin steel 5, the decompression groove 31 can relieve the pressing force of the thin steel 5 from the hard glue 3, and a connecting groove 6 connecting the decompression groove 31 and the soft glue molding cavity 4 is left between the top of the thin steel 5 and the upper mold core.

[0029] The present application opens a decompression groove 31 on the side of the hard glue 3 that is in contact with the thin steel 5, so as to relieve the pressing force exerted on the thin steel 5 by the vertical side of the hard glue 3, and at the same time opens a connecting groove 6 between the top of the thin steel 5 and the upper mold core to connect the decompression groove 31 and the soft glue molding cavity 4. When the soft glue is injected, the soft glue flows into the soft glue molding cavity 4, the connecting groove 6 and the decompression groove 31 in sequence. Under the condition of not affecting the product quality, both sides of the thin steel 5 are subjected to the same injection pressure, and the pressure on both sides of the thin steel 5 is balanced, so as to avoid cracks at the root of the thin steel 5, thereby improving the qualified rate of the sealing gasket.

[0030] like Figure 1 As shown, the soft glue molding cavity 4 is triangular in shape, and a side soft glue flow channel 7 is connected between the soft glue molding cavity 4 and the injection hole. The side soft glue flow channel 7 is arranged between the upper mold core and the lower mold core 1. The side soft glue flow channel 7 is arranged in two, which are directly connected to two longer side cavities of the three side cavities corresponding to the three sides of the soft glue molding cavity 4. The side soft glue flow channel 7 includes a main flow channel 71 connected to the injection port and a plurality of branch flow channels 72 connected between the main flow channel 71 and the soft glue molding cavity 4. The branch flow channels 72 are arranged at intervals along the side cavity direction of the soft glue molding cavity 4.

[0031] The present application sets two side soft glue channels, and sets the side soft glue channels into a main channel 71 and multiple branch channels 72, and injects into the soft glue molding cavity 4, so as to further improve the injection efficiency.

[0032] like Figure 1 As shown, a central soft glue flow channel 8 is also connected between the soft glue molding cavity 4 and the injection hole. The central soft glue flow channel 8 is arranged between the upper mold core and the lower mold core 1. The central soft glue flow channel 8 includes a central flow channel 81 connected to the injection hole and three side flow channels 82 connecting the central flow channel 81 and the central cavity of the soft glue molding cavity 4. The three side flow channels 82 are directly connected to the area of ​​the central cavity of the soft glue molding cavity 4 where more glue needs to be injected.

[0033] The present application further improves the injection molding efficiency of the central area of ​​the soft glue molding cavity 4 and saves injection molding time by setting three side flow channels 82, and the three side flow channels 82 are directly connected to the area of ​​the central cavity of the soft glue molding cavity 4 where more glue injection is required.

[0034] The implementation principle of a sealing gasket mold in an embodiment of the present application is: glue is injected into each injection hole at the same time, and the soft glue flows into the side cavity of the soft glue molding cavity 4 through the main channel 71 and the branch channel 72. At the same time, the soft glue flows into the central cavity of the soft glue molding cavity 4 through the central channel 81 and the side channel 82, and flows into the decompression groove 31 through the connecting groove 6 into the soft glue molding cavity 4. At this time, the pressure on both sides of the thin steel 5 is balanced. After the injection molding is completed, the mold is solidified and opened to obtain the required sealing gasket.

[0035] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A sealing gasket mold, comprising an upper mold core and a lower mold core (1), a hard glue groove (2) in which a hard glue (3) is engaged is provided between the upper mold core and the lower mold core (1), a soft glue molding cavity (4) connected to an injection hole is also provided between the upper mold core and the lower mold core (1), a piece of thin steel (5) for molding the hard glue groove (2) and the soft glue molding cavity (4) is formed between the hard glue groove (2) and the soft glue molding cavity (4), and the thin steel (5) is provided on the lower mold core (1), characterized in that: A decompression groove (31) adapted to the thin steel (5) is provided on the side of the hard glue (3) bonded to the thin steel (5), and the decompression groove (31) can relieve the pressing force exerted on the thin steel (5) by the hard glue (3), and a connecting groove (6) connecting the decompression groove (31) and the soft glue molding cavity (4) is left between the top of the thin steel (5) and the upper mold core.

2. A sealing gasket mold according to claim 1, characterized in that: The soft glue molding cavity (4) is triangular in shape, and a side soft glue flow channel (7) is connected between the soft glue molding cavity (4) and the injection hole. The side soft glue flow channel (7) is arranged between the upper mold core and the lower mold core (1). The side soft glue flow channels (7) are arranged in two pieces, which are directly connected to two longer side cavities among the three side cavities corresponding to the three sides of the soft glue molding cavity (4).

3. A sealing gasket mold according to claim 2, characterized in that: The side soft glue flow channel (7) comprises a main flow channel (71) connected to the injection port and a plurality of branch flow channels (72) connected between the main flow channel (71) and the soft glue molding cavity (4).

4. A sealing gasket mold according to claim 3, characterized in that: The branch channels (72) are arranged at intervals along the side cavity direction of the soft rubber molding cavity (4).

5. A sealing gasket mold according to claim 4, characterized in that: A central soft glue flow channel (8) is also connected between the soft glue molding cavity (4) and the injection hole. The central soft glue flow channel (8) is arranged between the upper mold core and the lower mold core (1) and is directly connected to the central cavity of the soft glue molding cavity (4).

6. A sealing gasket mold according to claim 5, characterized in that: The central soft glue flow channel (8) comprises a central flow channel (81) connected to the injection hole and a plurality of side flow channels (82) connected to the central flow channel (81) and the central cavity of the soft glue molding cavity (4).

7. A sealing gasket mold according to claim 6, characterized in that: The side flow channels (82) are provided in three numbers.

8. The sealing gasket mold according to claim 7, characterized in that: The three side flow channels (82) are respectively directly connected to the areas of the central cavity of the soft glue molding cavity (4) where more glue needs to be injected.

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