A venting structure for a spliced ​​two-color injection molding die

Abstract

This utility model relates to the field of automotive lighting manufacturing technology, specifically to a venting structure for a two-color injection molding mold. The first and second colors of the molded product are both positioned at the end of the mold filling cavity. The mold's fixed mold is divided into a core and inserts along the extension direction of the joint surface of the first and second colors. The gap at the joint surface of the core and inserts forms a channel for the gas inside the mold filling cavity to flow out. This solves the technical problem of air trapping on the non-partition surface of the molded product in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of automotive lighting manufacturing technology, specifically to an exhaust structure for a splicing two-color injection molding mold. Background Technology

[0002] In the injection molding process of plastic molds, cavity venting is particularly critical. If the gas in the cavity is not vented in time, it may lead to defects such as bubbles, burning, and air marks in the product. Poor mold venting can be divided into two types: those located at the parting surface and those not located at the parting surface. Poor venting at the parting surface can be solved by creating shallow grooves at the end of the filling process. However, there is no good solution for air trapping problems at the non-parting surface. Summary of the Invention

[0003] To address the technical problem of trapped air on the non-parting surface of molded products in existing technologies, this application proposes a venting structure for a spliced ​​two-color injection molding mold, which solves the aforementioned technical problem.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] This utility model provides a venting structure for a splicing two-color injection molding mold. The first and second colors of the molded product are both located at the end of the mold filling cavity. The fixed mold is split into a core and an insert along the extension direction of the splicing surface of the first and second colors of the molded product. The gap at the splicing surface of the core and the insert forms a channel for the gas in the mold filling cavity to flow out.

[0006] Furthermore, one end of the gap at the mating surface of the mold core and the insert is connected to the mold filling cavity, and the other end extends to the bottom surface of the mold core and the insert and is connected to the outside.

[0007] Furthermore, the gap h between the insert and the cavity surface of the mold core serving as the cavity is in the range of -0.01mm to 0.02mm, where the gap h is the height of the cavity surface of the mold core above the cavity surface of the insert.

[0008] Furthermore, the injection ports for both colors of the molded product are formed at the beginning of the mold, which is opposite to the end of the mold filling cavity.

[0009] Furthermore, during molding, preforms of both colors are injected simultaneously into their corresponding injection ports.

[0010] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0011] The present invention relates to a venting structure for a two-color injection molding mold. The first and second colors of the molded product are both positioned at the ends of the mold filling cavity. The fixed mold is divided into a core and inserts along the extension direction of the joint surface of the first and second colors. The gap between the joint surface of the core and inserts forms a channel for the gas in the mold filling cavity to flow out. During injection molding, as the blank moves, the gas in the mold filling cavity flows out through the gap between the joint surface of the core and inserts, thus solving the technical problem of trapped air on the non-parting surface of the molded product in the prior art. Compared to other solutions for improving poor mold venting during two-color injection molding, this invention, by modifying the fixed mold structure, does not affect process parameters, product structure, or product appearance.

[0012] The venting structure of the splicing two-color injection molding mold of this utility model provides a specific solution for the configuration of the mold core and inserts of the fixed mold, that is, the gap is controlled within (-0.01mm to 0.02mm), eliminating the need for repeated calibration based on the experience of engineers and improving efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the venting structure of the splicing two-color injection molding mold of this utility model;

[0014] Figure 2 This is a schematic diagram showing the cavity surface of the mold core of the venting structure of the splicing two-color injection molding mold of this utility model when it is higher than the cavity surface of the insert.

[0015] Figure 3 This is a schematic diagram showing the cavity surface of the mold core of the venting structure of the splicing two-color injection molding mold of this utility model when it is lower than the cavity surface of the insert.

[0016] In this utility model: 1-first color; 2-second color; 3-mold core; 4-insert; 5-gap; 6-gas. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0018] like Figure 1-3As shown, the exhaust structure of a splicing two-color injection molding mold of this utility model is characterized in that the first color 1 and the second color 2 of the molded product are both arranged at the end of the mold filling cavity. The fixed mold of the mold is split into the mold core 3 and the insert 4 along the extension direction of the splicing surface of the first color 1 and the second color 2 of the molded product. The gap 5 at the splicing surface of the mold core 3 and the insert 4 forms a channel for the gas 6 in the mold filling cavity to flow out.

[0019] In the preferred embodiment of this utility model, one end of the gap 5 at the mating surface of the mold core 3 and the insert 4 is connected to the mold filling cavity, and the other end extends to the bottom surface of the mold core 3 and the insert 4 and is connected to the outside.

[0020] In the preferred embodiment of this utility model, the gap h between the insert 4 and the cavity surface of the mold core 3 (which serves as the cavity) ranges from -0.01mm to 0.02mm, where the gap h is the height of the cavity surface of the mold core 3 above the cavity surface of the insert 4. The preferred embodiment of this utility model clearly proposes a specific method for configuring the mold core 3 and insert 4 with an venting structure, reducing the number of corrections, improving efficiency, and effectively addressing the problem of poor fit between the insert 4 and the mold core 3.

[0021] Specifically, if the mold core 3 is higher than the insert 4, i.e., the gap h > 0.02 mm, then... Figure 2 As shown, if the preload is insufficient during mold closing, a gap will appear between the first color 1 of the molded product and the insert 4 due to incomplete fit. When the blank of the second color 2 of the molded product is injected into the cavity, it will overflow into the cavity and enter the gap, resulting in flash on the final product. If the preload is too large, although there will be no flash, the mold core 3 will scratch the first color 1 of the molded product when the mold opens, resulting in the whitening problem of the final product.

[0022] Specifically, if insert 4 is higher than mold core 3, i.e., the gap h > 0.01 mm, then... Figure 3 As shown. When the mold is closed, the first color 1 of the molded product is completely attached to the insert 4. Compared with the integral fixed mold without the insert 4, the cavity is enlarged indirectly due to the large gap between the insert 4 and the mold core 3, resulting in flash on the final product. Furthermore, after the mold is opened, the insert 4 on the higher side will scratch the overflow of the second color 2 of the molded product, resulting in fuzz on the final product.

[0023] In the preferred embodiment of this utility model, the injection ports of the two colors of the molded product are both formed at the beginning end opposite to the end of the mold filling cavity.

[0024] In the preferred embodiment of this utility model, during molding, the blanks of the two colors are simultaneously injected into the corresponding injection ports.

[0025] It should be understood that the specific embodiments described above are only for explaining the present invention and are not intended to limit the present invention. Obvious variations or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. An exhaust structure of a split two-color injection molding mold characterized by comprising: The first color (1) and the second color (2) of the molded product are both located at the end of the mold filling cavity. The mold is divided into a core (3) and an insert (4) along the extension direction of the splicing surface of the first color (1) and the second color (2) of the molded product. The gap (5) at the splicing surface of the core (3) and the insert (4) forms a channel for the gas (6) in the mold filling cavity to flow out.

2. According to claim 1, the venting structure of the splicing two-color injection molding mold, one end of the gap (5) at the splicing surface of the mold core (3) and the insert (4) is connected to the mold filling cavity, and the other end extends to the bottom surface of the mold core (3) and the insert (4) and is connected to the outside.

3. The venting structure of a split two-color injection molding mold according to claim 1, wherein The gap h between the insert (4) and the cavity surface of the mold core (3) is in the range of -0.01mm to 0.02mm, where the gap h is the height of the cavity surface of the mold core (3) above the cavity surface of the insert (4).

4. The venting structure of a split two-color injection molding mold according to claim 1, wherein The injection ports for both colors of the molded product are formed at the beginning end, which is opposite to the end of the mold filling cavity.

5. The venting structure of a split two-color injection molding mold according to claim 4, wherein During molding, two colored blanks are injected simultaneously into their corresponding injection ports.

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