Deburring injection mold
By adjusting the positions of the moving mold side and the fixed mold side and designing the sprue bushing and ejector pin holes, the problems of filamentous flash and silver threads caused by the warping of white sheets in traditional injection molds were solved, and high-quality production of dual-color automotive taillight covers was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HELLA BHAPSANHEAUTOMOTIVE LIGHTING CO LTD
- Filing Date
- 2025-04-09
- Publication Date
- 2026-04-21
AI Technical Summary
When using traditional injection molds to produce dual-color taillight covers for automobiles, the warping and deformation of the white sheet results in a high rate of defects such as filamentous flash and silver streaks, requiring manual handling and affecting product quality.
By adjusting the positions of the moving mold side and the fixed mold side, the outermost edge of the white sheet is covered by the black sheet, forming a sealed structure, eliminating the gap caused by warping, and the smooth molding of the white and black sheets is achieved through the design of the sprue bushing and ejector pin holes.
It effectively eliminates the problems of fibrous flash and silver streaks, improves product quality and production efficiency, and reduces manual processing steps.
Smart Images
Figure CN224145233U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection mold technology, specifically to a deburring injection mold. Background Technology
[0002] Currently, the dual-color mask (made of PMMA) for automotive taillights still uses the traditional design where the white portion is 0.2mm larger than the black portion. Figure 1 As shown, the injection molds used in traditional designs produce white, thread-like flash during production. After the first injection of the white sheet, the white sheet warps and deforms, and during the second injection of the black sheet, the white sheet is pressed back into the mold, resulting in white, thread-like flash. This severely affects product quality, and the thread-like flash requires secondary manual processing. If the thread-like flash falls into the mold and is re-injected and melted, it will cause silver streaks in the product, increasing the defect rate and affecting output. Therefore, we propose a deburring injection mold to solve the above problems. Utility Model Content
[0003] The purpose of this invention is to provide a deburring injection mold to solve the above-mentioned technical problems.
[0004] This utility model provides the following technical solution:
[0005] A deburring injection mold includes: a fixed mold part and a movable mold part arranged vertically; a fixed mold core is fixedly provided at the lower end of the fixed mold part; and a movable mold core is also fixedly provided at the upper end of the movable mold part corresponding to the fixed mold core.
[0006] The fixed mold core and the moving mold core cooperate to form a mold cavity body. The mold cavity body includes a first mold cavity and a second mold cavity. The first mold cavity is used for molding a first white film material, and the second mold cavity is used for molding a second black film material.
[0007] The fixed mold core has a fixed mold side, and the moving mold core has a moving mold side. The moving mold side is located at the outer edge of the fixed mold side, so that the outermost edge of the molded white sheet covers the molded black sheet.
[0008] Furthermore, the distance between the moving mold side and the fixed mold side is 0.2 mm.
[0009] Furthermore, a sprue sleeve is provided at the middle position of the fixed mold part, and the lower opening of the sprue sleeve is directly opposite the upper end of the mold cavity body, for the raw material to enter the mold cavity body.
[0010] Furthermore, an ejector pin hole is provided on the inner side of the moving mold component, and the upper opening of the ejector pin hole is directly opposite the lower side of the mold cavity body.
[0011] Furthermore, both the white film material and the black film material are made of PMMA.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] In this invention, by adjusting the positions of the original moving mold side and the fixed mold side, the outermost edge of the white sheet formed in the first mold cavity is covered by the black sheet formed in the second mold cavity, forming a sealed structure in which the black sheet wraps the white sheet, eliminating the gap caused by the warping of the white sheet, thereby solving the problem of fibrous flash. Attached Figure Description
[0014] Figure 1 This is an enlarged structural diagram of the fixed mold core and the moving mold core in the prior art;
[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the deburring injection mold in this utility model;
[0016] Figure 3 This is a schematic diagram of the overall structure of the fixed mold core and the moving mold core in this utility model;
[0017] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle.
[0018] In the figure: 100, fixed mold part; 110, fixed mold core; 110a, fixed mold side; 120, sprue bushing; 200, moving mold part; 210, moving mold core; 210a, moving mold side; 220, ejector pin hole; 300, mold cavity body; 310, first mold cavity; 320, second mold cavity. Detailed Implementation
[0019] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0020] like Figure 2-4 As shown, this utility model provides a technical solution: a deburring injection mold, including a fixed mold part 100 and a movable mold part 200 arranged vertically. A fixed mold core 110 is fixedly arranged at the lower end of the fixed mold part 100, and a movable mold core 210 is arranged at the upper end of the movable mold part 200 corresponding to the fixed mold core 110. The fixed mold core 110 and the movable mold core 210 cooperate with each other. A mold cavity body 300 for injection molding is also formed between the fixed mold core 110 and the movable mold core 210. The mold cavity body 300 has a first mold cavity 310 and a second mold cavity 320. The first mold cavity 310 is used for molding the first white sheet material, and the second mold cavity 320 is used for molding the second black sheet material.
[0021] Among them, such as Figure 4 As shown, the fixed mold core 110 has a fixed mold side 110a, while the moving mold core 210 has a moving mold side 210a, which is located at the outer edge of the fixed mold side 110a.
[0022] The distance between the moving mold side 210a and the fixed mold side 110a is 0.2 mm.
[0023] The following explains how to avoid burrs on a two-color mask during actual injection molding:
[0024] like Figure 1 The image shows a traditional injection mold. The fixed mold side 110a is located 0.2 mm outside the moving mold side 210a. Similarly, the main body of the mold cavity 300 also includes a first mold cavity 310 and a second mold cavity 320. In the two-color injection molding process, after the first injection of white sheet is completed, it will warp and deform due to cooling shrinkage or stress release. When the second injection of black sheet is injected, the deformed white sheet is forcibly pressed back to its original position by the mold, resulting in a small gap between its edge and the mold parting surface. At this time, the molten material of the second injection of black sheet seeps into the gap, forming white filaments that are visible to the naked eye (because the white sheet material is squeezed out or the molten material does not completely cover the edge of the white sheet). The filamentous flash needs to be manually processed a second time, and the processed filamentous flash will fall back into the mold. When injection is performed again, these debris will generate gas or microbubbles due to material degradation (such as the breakage of PMMA molecular chains at high temperature). After the gas mixes with the molten material, it flows to the surface of the product and forms silver filamentous patterns after cooling.
[0025] like Figure 4 The image shows an improved injection mold. The fixed mold side 110a is located on the inner edge of the moving mold side 210a. During injection, the first injection is for white sheet injection as usual, and the second injection is for black sheet injection. At this time, the periphery of the black sheet is completely larger than that of the white sheet, and the edge of the white sheet is completely covered by the black sheet. The parting surface is transferred from the edge of the white sheet to the outside of the black sheet. Therefore, when the black sheet is injected, its material directly fills the outside of the white sheet, forming a "black sheet wrapping white sheet" sealing structure, thereby eliminating the gap caused by warping, solving the problem of filamentous flash, and the problem of silver streaks generated during subsequent re-injection.
[0026] Furthermore, such as Figure 3As shown, the injection mold also includes a sprue bushing 120 on the fixed mold core 110, with the lower opening of the sprue bushing 120 facing the upper end of the mold cavity body 300, and an ejector pin hole 220 on the movable mold core 210, with the upper opening of the ejector pin hole 220 facing the lower end of the mold cavity body 300. The sprue bushing 120 is used for adding raw material (plastic in a molten state). After the white flake raw material is added through the first injection and cooled, the movable mold core 210 on it is rotated 180 degrees and the second injection of black flake raw material begins. After the black flake has cooled, the molded two-color mask is ejected from the mold cavity body 300 by using an ejector pin through the ejector pin hole 220 to complete the injection molding.
[0027] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.
Claims
1. A deburring injection mold, characterized in that, include: A fixed mold part (100) and a movable mold part (200) are arranged vertically. A fixed mold core (110) is fixedly arranged at the lower end of the fixed mold part (100), and a movable mold core (210) is also fixedly arranged at the upper end of the movable mold part (200) corresponding to the fixed mold core (110). The fixed mold core (110) and the moving mold core (210) cooperate to form a mold cavity body (300). The mold cavity body (300) includes a first mold cavity (310) and a second mold cavity (320). The first mold cavity (310) is used for molding a first white film material, and the second mold cavity (320) is used for molding a second black film material. The fixed mold core (110) has a fixed mold side (110a), and the moving mold core (210) has a moving mold side (210a). The moving mold side (210a) is located at the outer edge of the fixed mold side (110a) so that the outermost edge of the molded white sheet is covered by the molded black sheet.
2. The deburring injection mold of claim 1, wherein: The distance between the moving mold side (210a) and the fixed mold side (110a) is 0.2 mm.
3. The deburring injection mold of claim 1, wherein: A sprue sleeve (120) is also provided at the middle position of the fixed mold part (100). The lower opening of the sprue sleeve (120) is directly opposite the upper end of the mold cavity body (300) for the raw material to enter the mold cavity body (300).
4. The deburring injection mold of claim 3, wherein: The moving mold (200) is also provided with an ejector pin hole (220) on its inner side, and the upper opening of the ejector pin hole (220) is directly opposite the lower side of the mold cavity body (300).
5. The deburring injection mold of claim 1, wherein: Both the white film material and the black film material are made of PMMA.