A partial injection molding structure and injection mold for high-gloss products

Abstract

This utility model discloses a partial injection molding structure and injection mold for high-gloss products, relating to the field of injection molding technology. It includes a pull rod and a gate structure: the pull rod corresponds to the mold runner, extending in a direction parallel to the mold opening direction, with the end near the product being the connecting end; the gate structure is located at the connecting end of the pull rod, connecting the pull rod to the inner side of the product, and includes a gate body and first to third connecting structures. The gate body is an inclined elongated strip, with the end furthest from the pull rod facing the product and the end closest to the pull rod facing away from the product; the first connecting structure is located on the side of the gate body facing the product and furthest from the pull rod, with its end connected to the product; the second connecting structure is located on the end of the gate body furthest from the first connecting structure, extending in the same direction; the third connecting structure connects the second connecting structure to the connecting end of the pull rod. This structure is simple and reasonable, requiring no complex sliders or angled ejectors, adaptable to different product internal spaces and molding angles, improving process adaptability, eliminating the need for increased wall thickness or material adjustments, controlling costs, and providing support for the large-scale, high-quality production of high-gloss products.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to a partial structure for injection molding of high-gloss products and an injection mold. Background Technology

[0002] In the production of high-gloss products, the requirements for product appearance quality are extremely strict, with the control standards for appearance shrinkage being particularly stringent.

[0003] When using injection molding to produce high-gloss products and selecting PMMA material, a large distance between the gate and the melt filler end in the mold design can easily lead to shrinkage marks on the product, making it difficult to meet quality requirements. Existing solutions to this problem have significant limitations: adjusting the product material to change the gloss level cannot consistently guarantee a high-gloss appearance; increasing the product wall thickness to improve shrinkage marks results in substantial waste of raw materials, which does not meet cost control requirements.

[0004] Therefore, the only feasible solution currently available is to increase the number of gates to shorten the distance from a single gate to its corresponding filling end. However, this solution still faces several conflicts between mold structure and product performance in practical applications: if side gates are set at the edge of the product, stress concentration is likely to occur at the gate location, causing the product to crack during use or subsequent processing. At the same time, the traces left by the side gates will directly affect the assembly accuracy and appearance integrity of the product; if the gates are opened inside the product using a submarine gate design, slag is likely to be generated and remain in the mold cavity. These residual slags will adhere to the product surface during subsequent injection filling, damaging the high-gloss appearance; if a slider or angled ejector structure is used to open the gates, it will be limited by the product's own structure (such as internal space, molding angle, etc.) and cannot be implemented in practice. Utility Model Content

[0005] To address one of the shortcomings of existing technologies, this utility model provides a partial injection molding structure and injection mold for high-gloss products, solving the problem of injection gate structure for high-gloss products.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a partial injection molding structure for high-gloss products, comprising: The pull rod corresponds to the runner of the injection mold. The extension direction of the pull rod is parallel to the mold opening direction of the injection mold. The end of the pull rod closest to the product is the connecting end. A gate structure is disposed at the connecting end of the pull rod, and the gate structure is connected to both the connecting end of the pull rod and the inner surface of the product; the gate structure includes: The gate body is located on one side of the connecting end of the pull rod; the gate body is an inclined elongated block, with the end away from the pull rod facing the direction closer to the product, and the end closer to the pull rod facing the direction away from the product; A first connecting structure is disposed on the side of the gate body facing the product and away from the pull rod; the first connecting structure is located between the product and the gate body, and the end of the first connecting structure away from the gate body is connected to the product; The second connecting structure is located at the end of the gate body away from the first connecting structure; the second connecting structure extends in the same direction as the first connecting structure. The third connecting structure is connected to the second connecting structure and the connecting end of the pull rod, respectively.

[0007] Preferably, the direction of the injection mold opening is taken as direction one, and the direction perpendicular to the injection mold opening direction is taken as direction two; The pulling rod is rod-shaped, and the axial direction of the pulling rod is parallel to the direction one; The connection point between the first connection structure and the product is located on the side of the connection end facing direction one; The gate body includes: The first structural part is located on the side of the gate body facing the pull rod in direction two; The second structural part is located on the side of the gate body away from the pull rod in direction two; The first connecting structure and the second structural part are connected; the second connecting structure and the first structural part are connected.

[0008] Preferably, the second structural part is an inclined surface relative to direction two, with one side of the second structural part facing the product being close to the pull rod in direction two, and the other side being away from the pull rod in direction two.

[0009] Preferably, the angle between the inclined surface of the second structural part and direction two is greater than or equal to 60 degrees.

[0010] Preferably, the gate body further includes: The third structural part is located on the same side as the second structural part; and the third structural part is located on the side of the second structural part away from the product; the connection between the third structural part and the second structural part is an arc-shaped transition structure.

[0011] Preferably, the first structural part is a plane extending in one direction; The second connecting structure is columnar, and the third connecting structure is connected to the end of the second connecting structure that is away from the first connecting structure.

[0012] Preferably, the length of the gate body satisfies the following condition:

[0013] in The length of the main body of the gate, The diameter of the pull rod.

[0014] An injection mold is used for injection molding partial structures of high-gloss products as described above. Preferably, the mold includes a fixed mold and a moving mold, wherein the moving mold has an ejection structure inside, the ejection structure comprising: The ejector base plate can move in one direction; The top block is linked with the ejector pin base plate; during injection molding, the end face of the top block facing the product is in contact with the product, and the side of the top block has a contoured groove corresponding to the gate body and the first connecting structure.

[0015] Preferably, it also includes: A straight push rod, the upper end of which is fixedly connected to the top block; The limiting post is fixedly sleeved on the outside of the straight push rod, and the limiting post and the push pin base plate are slidably connected. The retaining column is fixedly connected to the moving mold base plate; A spring is positioned between the limiting post and the retaining post.

[0016] Compared with existing technologies, this solution offers the following advantages: The unique design of the injection molding local structure for high-gloss products, combined with the precise connection between the first connecting structure and the inner surface of the product, effectively shortens the distance from the gate to the end of the melt filling process. This ensures sufficient pressure holding at the filling end during injection molding, fundamentally guaranteeing the appearance quality of high-gloss products and preventing appearance defects. The structural design fully considers the feasibility of strong release of the gate structure and pull rod. The stable connection between the pull rod and the second and third connecting structures, along with the reasonable partitioning of the first and second structural parts within the gate body, enables strong release of the gate structure and pull rod without requiring additional molding cycles. This improves production efficiency while reducing operational complexity during production.

[0017] The overall design of this structure is simple and reasonable, with each component working together in coordination. It does not rely on complex slider or angled top structures, and can adapt to the internal space and forming angle requirements of different products, significantly improving the adaptability and versatility of the process. At the same time, it does not require increasing the product wall thickness or adjusting the material to meet quality requirements, effectively controlling raw material costs and providing strong support for the large-scale, high-quality production of high-gloss products. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the pull rod, gate structure, and product assembly state in an embodiment of this application. Figure 1 ; Figure 2 This is a schematic diagram of the pull rod, gate structure, and product assembly state in an embodiment of this application. Figure 2 ; Figure 3This is a schematic diagram of the pull rod and gate structure in an embodiment of this application. Figure 1 ; Figure 4 This is a schematic diagram of the pull rod and gate structure in an embodiment of this application. Figure 2 ; Figure 5 This is a schematic diagram of the pull rod and gate structure in an embodiment of this application. Figure 1 ; Figure 6 This is a schematic diagram of the pull rod and gate structure in an embodiment of this application. Figure 2 ; Figure 7 This is a schematic diagram of the pull rod and gate structure in an embodiment of this application. Figure 3 ; Figure 8 This is a front view of the pull rod and gate structure according to an embodiment of this application; Figure 9 This is a rear view of the pull rod and gate structure according to an embodiment of this application; Figure 10 This is a right view of the pull rod and gate structure according to an embodiment of this application; Figure 11 This is a schematic diagram of the mold structure according to an embodiment of this application; Figure 12 This is a schematic diagram of the ejection structure and product according to an embodiment of this application. Figure 1 ; Figure 13 This is a schematic diagram of the ejection structure and product according to an embodiment of this application. Figure 2 ; Figure 14 for Figure 13 A magnified view of part A.

[0019] In the picture: 11. Pull rod; 111. Connecting end; 12. Gating structure; 121. Gating body; 1211. First structural part; 1212. Second structural part; 1213. Third structural part; 122. First connecting structure; 123. Second connecting structure; 124. Third connecting structure; 1. Moving mold base plate; 2. Ejector pin base plate; 3. Ejector pin panel; 4. Moving mold plate; 5. Moving mold core; 6. Ejector block; 7. Straight ejector rod; 7. Guide sleeve; 8. Limiting post; 9. Holding post; 10. Spring. Detailed Implementation

[0020] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] Please see Figures 1-10 This application provides the following technical solutions: A partial injection molding structure for a high-gloss product includes a pull rod 11 and a gate structure 12. The pull rod 11 corresponds to the runner of the injection mold, and its extension direction is parallel to the mold opening direction. The end of the pull rod 11 closest to the product 100 is a connecting end 111. The gate structure 12 is located at the connecting end 111 of the pull rod 11, and is connected to both the connecting end 111 of the pull rod 11 and the inner surface of the product 100.

[0022] The gate structure 12 includes a gate body 121, a first connecting structure 122, a second connecting structure 123, and a third connecting structure 124. The gate body 121 is located on one side of the connecting end 111 of the pull rod 11; the gate body 121 is an inclined elongated block, with its end away from the pull rod 11 facing towards the product 100, and its end near the pull rod 11 facing away from the product 100; the first connecting structure 122 is located on the side of the gate body 121 facing the product 100 and away from the pull rod 11; the first connecting structure 122 is located between the product 100 and the gate body 121, and the end of the first connecting structure 122 away from the gate body 121 is connected to the product 100; the second connecting structure 123 is located on the end of the gate body 121 away from the first connecting structure 122; the second connecting structure 123 extends in the same direction as the first connecting structure 122; the third connecting structure 124 is connected to the second connecting structure 123 and the connecting end 111 of the pull rod 11.

[0023] Based on the above implementation scheme, for ease of explanation, the mold opening direction of the injection mold is referred to as direction one, and the direction perpendicular to the mold opening direction of the injection mold is referred to as direction two; the pull rod 11 is rod-shaped, and the axis of the pull rod 11 is parallel to direction one; the connection between the first connecting structure 122 and the product 100 is located on the side of the connecting end 111 facing direction one.

[0024] The gate body 121 includes a first structural part 1211, a second structural part 1212, and a third structural part 1213. The first structural part 1211 is located on the side of the gate body 121 facing the pull rod 11 in direction two, and is a straight surface extending along direction one. The second structural part 1212 is located on the side of the gate body 121 away from the pull rod 11 in direction two. A first connecting structure 122 connects to the second structural part 1212; a second connecting structure 123 connects to the first structural part 1211. The second structural part 1212 is an inclined surface relative to direction two. The side of the second structural part 1212 facing the product 100 is located close to the pull rod 11 in direction two, while the other side is located away from the pull rod 11 in direction two. The angle between the inclined surface of the second structural part 1212 and direction two is not less than 60 degrees. The third structural part 1213 and the second structural part 1212 are located on the same side; and the third structural part 1213 is located on the side of the second structural part 1212 away from the product 100; the connection between the third structural part 1213 and the second structural part 1212 is an arc-shaped transition structure.

[0025] The first connecting structure 122 is a structure with a gradually changing thickness; the thickness at the connection between the first connecting structure 122 and the product 100 is less than the thickness at the connection between it and the second structural part 1212. The second connecting structure 123 is columnar, and the third connecting structure 124 connects to the end of the second connecting structure 123 opposite to the side of the first connecting structure 1211. Figures 8 to 10 Taking the direction as a reference, the second connecting structure 123 is a column structure that is larger at the top and smaller at the bottom, with the area at the top slightly larger than the area at the bottom, and the perimeter is an inclined gradient structure surface.

[0026] The length of the gate body 121 is satisfied.

[0027] in The length of the gate body 121, The diameter of the pull rod 11.

[0028] The overall volume of the gate body 121 cannot be too small to prevent breakage during forced ejection; therefore, the above-mentioned proportions are adopted in this design. In the attached diagram, the diameter of the pull rod is 10mm, and the overall length of the gate body 121 is approximately 78.5mm. Through this design, there is also sufficient distance between the pull rod 11 and the product 100. Combined with the special structure of the gate body 121 and the ejection structure of the mold, the gate structure 12 can meet the requirement of direct deformation and forced ejection during mold opening.

[0029] Based on the above implementation plan, see Figures 11 to 14This solution proposes an injection mold for use in the injection molding of local structures of the aforementioned high-gloss products. The injection mold includes a fixed mold and a moving mold. The moving mold has an ejection structure inside, and the fixed mold can adopt a conventional structure, which will not be described again.

[0030] The moving mold includes a moving mold base plate 1, a moving mold plate 4 is disposed above the moving mold base plate 1, and an ejector base plate 2 and an ejector plate 3 are disposed between the moving mold base plate 1 and the moving mold plate 4, with the ejector base plate 2 located below the ejector plate 3. A moving mold core 5 is disposed on the moving mold plate 4. The ejector base plate 2 and the ejector plate 3 can move between the moving mold base plate 1 and the moving mold plate 4.

[0031] An ejector structure is provided between the moving mold base plate 1 and the moving mold plate 4. The ejector structure is linked with the ejector base plate 2 and the ejector panel 3. The ejector structure includes an ejector block 6. During injection molding, the end face of the ejector block 6 facing the product 100 is in contact with the product 100. The side of the ejector block 6 has a contoured groove corresponding to the gate body 121 and the first connecting structure 122. The lower end face of the ejector block 6 is fixedly connected to the upper end of the straight ejector rod 7. A limiting post 8 is fixedly sleeved on the outside of the straight ejector rod 7. The straight ejector rod 7 passes through the moving mold plate 4, and a guide sleeve 71 is provided on the moving mold plate 4 corresponding to the straight ejector rod 7. The guide sleeve 71 and the straight ejector rod 7 are slidably connected. The limiting post 8 is slidably connected to the ejector base plate 2. A retaining post 9 is fixedly provided on the moving mold base plate 1. A spring 10 is provided between the limiting post 8 and the retaining post 9.

[0032] When the mold opens, the ejector plate 2 drives the ejection mechanism to move vertically upward. The ejector block 6 also moves vertically upward under the clamping force of the product 100 and the gate structure 12, and the elastic force of the spring 10 on the straight ejector rod 7. When the limit post 8 touches the bottom of the moving platen 4, the straight ejector rod 7 can no longer move upward, and the straight ejector block 6 stops moving. As the ejector plate 2 continues to move upward, the gate structure 12 is strongly deformed under the action of the ejection force, and finally the straight ejector block 6 is dislodged from the pull rod 11 and the gate structure 12.

[0033] In the description of this application and its embodiments, it should be understood that the terms "top", "bottom", "height", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] In this application and its embodiments, unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," "fix," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] In this application and its embodiments, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The foregoing disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0037] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0038] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A partial structure for injection molding of a high-gloss product, characterized in that, include: The pull rod corresponds to the runner of the injection mold. The extension direction of the pull rod is parallel to the mold opening direction of the injection mold. The end of the pull rod closest to the product is the connecting end. A gate structure is disposed at the connecting end of the pull rod, and the gate structure is connected to both the connecting end of the pull rod and the inner surface of the product; the gate structure includes: The gate body is located on one side of the connecting end of the pull rod; the gate body is an inclined long strip-shaped block, with the end away from the pull rod facing the direction closer to the product, and the end close to the pull rod facing the direction away from the product; A first connecting structure is disposed on the side of the gate body facing the product and away from the pull rod; the first connecting structure is located between the product and the gate body, and the end of the first connecting structure away from the gate body is connected to the product; The second connecting structure is located at the end of the gate body away from the first connecting structure; the second connecting structure extends in the same direction as the first connecting structure. The third connecting structure is connected to the second connecting structure and the connecting end of the pull rod, respectively.

2. The injection-molded partial structure of high-gloss products as described in claim 1, characterized in that, The direction of the injection mold opening is defined as direction one, and the direction perpendicular to the injection mold opening direction is defined as direction two. The pulling rod is rod-shaped, and the axial direction of the pulling rod is parallel to the direction one; The connection point between the first connection structure and the product is located on the side of the connection end facing direction one; The gate body includes: The first structural part is located on the side of the gate body facing the pull rod in direction two; The second structural part is located on the side of the gate body away from the pull rod in direction two; The first connecting structure and the second structural part are connected; the second connecting structure and the first structural part are connected.

3. The injection-molded partial structure of high-gloss products as described in claim 2, characterized in that, The second structural part is an inclined surface relative to direction two. The side of the second structural part facing the product is located close to the pull rod in direction two, and the other side is located away from the pull rod in direction two.

4. The injection-molded partial structure of high-gloss products as described in claim 3, characterized in that, The angle between the inclined surface of the second structural part and direction two is greater than or equal to 60 degrees.

5. The injection-molded partial structure of high-gloss products as described in claim 4, characterized in that, The gate body also includes: The third structural part is located on the same side as the second structural part; and the third structural part is located on the side of the second structural part away from the product; the connection between the third structural part and the second structural part is an arc-shaped transition structure.

6. The injection-molded partial structure of high-gloss products as described in claim 3, characterized in that, The first structural part is a plane extending in one direction; The second connecting structure is columnar, and the third connecting structure is connected to the end of the second connecting structure that is away from the first connecting structure.

7. The injection-molded partial structure of high-gloss products as described in claim 3, characterized in that, The length of the gate body meets the following requirements. ； in The length of the main body of the gate, The diameter of the pull rod.

8. An injection mold, characterized in that, It is applied to the injection molding local structure of high-gloss products as described in any one of claims 1-7.

9. The injection mold as described in claim 8, characterized in that, It includes a fixed mold and a moving mold, wherein the moving mold has an ejection structure inside, and the ejection structure includes: The ejector base plate can move in one direction; The top block is linked with the ejector pin base plate; during injection molding, the end face of the top block facing the product is in contact with the product, and the side of the top block has a contoured groove corresponding to the gate body and the first connecting structure.

10. The injection mold as described in claim 9, characterized in that, Also includes: A straight push rod, the upper end of which is fixedly connected to the top block; The limiting post is fixedly sleeved on the outside of the straight push rod, and the limiting post and the push pin base plate are slidably connected. The retaining column is fixedly connected to the moving mold base plate; A spring is positioned between the limiting post and the retaining post.

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