Injection molding mold for thin-wall products
The sub-gate injection molding mold combined with the split ejector design solves the problem of residual nozzles in thin-walled products, and automatically cuts off the nozzles when the product is ejected, reducing costs and improving quality.
Patent Information
- Application Number
- CN202422647971.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-10-31
AI Technical Summary
In the existing technology, when thin-walled products are injection molded, nozzle residue is unavoidable and needs to be removed through secondary processing, which affects production costs and product quality.
The sub-gate injection molding mold is adopted, combined with the split ejector design. The cutting edge and the sub-gate are in the same vertical plane. The sprue is automatically cut off when the product is ejected. The width of the cutting edge is larger than the sprue width to ensure one-time removal.
The gate is automatically cut off when the product is ejected, eliminating the need for secondary processing, reducing production costs, ensuring product quality, and avoiding gate residue and shovel damage.
Smart Images
Figure CN223383875U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of production equipment, in particular to an injection molding die for thin-walled products. Background Art
[0002] Plastic injection mold is the most commonly used molding mold in the production of thermoplastic plastic products. Figure 1 、 2 When thin-walled products with a thickness D less than 1.0 mm are injection molded, open gate injection molding is conventionally used, and the runner 100 and the product 200 are ejected simultaneously, so the product and the runner are connected together. This method has the following disadvantages: 1. Residual sprue cannot be avoided; 2. Secondary processing is required to remove the sprue, which increases production costs; 3. Removing the sprue may affect the appearance of the product, such as causing scratches and deformation on the product surface near the sprue, affecting product quality. Summary of the Invention
[0003] The purpose of the utility model is to provide an injection molding die for thin-walled products, which can well solve the above technical problems.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] An injection molding mold for thin-walled products includes an injection cavity and a runner constructed by an upper mold assembly and a lower mold assembly. A submerged gate is provided at the end of the runner, which is connected to the injection cavity. The lower mold assembly is provided with a slitting ejector pin, which is located below the connection between the submerged gate and the injection cavity. The slitting ejector pin is used to eject the product molded in the injection cavity, and a cutting edge is provided on the outer side of the upper end of the slitting ejector pin. The cutting edge and the gate surface of the submerged gate are in the same vertical plane, so that the sprue can be cut off when the slitting ejector pin ejects the product.
[0006] The above solution is further that the slitting ejector is flat, so that the outer side of the slitting ejector forms a vertical flat surface, and the cutting edge is the edge of the upper end of the flat surface; when the slitting ejector ejects the product, the flat surface is ejected against the gate surface.
[0007] The above solution is further characterized in that the width of the cutting edge is greater than the width of the nozzle in the same direction, so that when the slitting ejector ejects the product, the cutting edge can completely cut off the nozzle at one time.
[0008] The above solution is further characterized in that the height of the connection portion between the nozzle and the product in the ejection direction of the slitting ejector is less than half of the height of the product in the same area.
[0009] With the above-mentioned structure, the present invention employs sub-gate injection molding and incorporates a splitting ejector pin in the lower mold assembly. This pin simultaneously removes the sprue as the product is ejected, resulting in the following beneficial effects: 1. The sprue is removed simultaneously with product ejection, eliminating the need for secondary sprue processing and saving costs. 2. The splitting ejector pin ejects directly against the sprue surface, allowing for very clean sprue removal, avoiding sprue residue and ensuring product quality. 3. Its simple structure facilitates fabrication and implementation, with low investment costs, making this structure ideal for the production of thin-walled products. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Attachment Figure 1 This is a schematic diagram of the structure of thin-walled products;
[0011] Attachment Figure 2 This is a schematic diagram of the connection structure between the existing injection molded thin-walled products and the runner;
[0012] Attachment Figure 3 This is a schematic structural diagram of one embodiment of the present utility model;
[0013] Attachment Figure 4 for Figure 3 Schematic diagram of the connection between the injection molded product and the runner in the embodiment;
[0014] Attachment Figure 5 for Figure 3 Schematic diagram of the local structure of the product after ejection in the embodiment. DETAILED DESCRIPTION
[0015] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention.
[0016] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "vertical", "horizontal", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.
[0017] See Figure 3 、 4Figures 5 and 6 are schematic structural diagrams of a preferred embodiment of the present invention. The present invention relates to a mold for injection molding thin-walled products, comprising an injection cavity 3 and a runner 4, enclosed by an upper mold assembly 1 and a lower mold assembly 2. The upper mold assembly 1 and the lower mold assembly 2 can be relatively separated to facilitate opening the mold and removing the product. A submerged gate 41 is provided at the end of the runner 4. The submerged gate 41 communicates with the injection cavity 3, allowing liquid raw materials to be injected into the injection cavity 3 through the runner 4 and the submerged gate 41, thereby achieving product injection molding. The lower mold assembly 2 includes a slitting ejector pin 21, which is located below the connection between the subgate 41 and the injection cavity 3. The slitting ejector pin 21 is used to eject the product 5 formed in the injection cavity 3, and a cutting edge 211 is provided on the outer side of the upper end of the slitting ejector pin 21. The cutting edge 211 and the gate surface of the subgate 41 are on the same vertical plane, so that the sprue 6 is cut off when the slitting ejector pin 21 ejects the product 5; the force of the movement of the slitting ejector pin 21 and the relative motion relationship are utilized to enable the cutting edge 211 to cut off the sprue well, so that the product is ejected and the sprue is cut off at the same time, and the demoulding and sprue removal are carried out simultaneously and completed at one time, without the need for secondary processing of the sprue, saving production processes and costs.
[0018] Figure 3 、 4 5, in this embodiment, the slitting ejector 21 is flat, so that the outer side of the slitting ejector 21 forms a vertical flat surface 212, and the cutting edge 211 is the edge of the upper end of the flat surface 212. The structure is simple and easy to manufacture, and the structure also has the effect of smooth and accurate movement; when working, the slitting ejector 21 ejects the product 5, and the flat surface 212 is ejected close to the gate surface, which can cut off the gate very cleanly, avoid gate residue, and avoid scraping the product during ejection, thereby ensuring product quality.
[0019] Furthermore, the width of the cutting edge 211 is greater than the width of the nozzle 6 in the same direction, and they are centrally aligned with each other, so that when the slitting ejector 21 ejects the product 5, the cutting edge 211 can completely cut off the nozzle 6 in one go. Furthermore, preferably, the height of the connection between the nozzle 6 and the product 5 in the ejection direction of the slitting ejector 21 is less than half the height of the product 5 in the same area. This small glue level allows for accurate and clean nozzle removal, avoiding nozzle residue and facilitating production.
[0020] This utility model uses submerged gate injection molding to optimize the sprue structure, facilitating subsequent removal work. A splitting ejector is provided in the lower mold assembly, and the sprue is removed by the splitting ejector when the product is ejected. This achieves the following: 1. The sprue is removed simultaneously with the product ejection, eliminating the need for secondary sprue processing and saving costs. 2. The splitting ejector ejects close to the gate surface, allowing for very clean removal of the gate, avoiding gate residue and scraping damage to the product, thus ensuring product quality. 3. The structure is simple, easy to manufacture and implement, and has a low investment cost. This structure is very suitable for the production of thin-walled products.
[0021] The above detailed description of the present invention in combination with the implementation methods is only for illustrating the technical concept and features of the present invention. Its purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the scope of protection of the present invention. Therefore, all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.
Claims
1. A mold for injection molding thin-walled products, comprising an injection cavity (3) and a flow channel (4) enclosed by an upper mold component (1) and a lower mold component (2), characterized in that: The end of the runner (4) is provided with a submerged gate (41), which is connected to the injection mold cavity (3); the lower mold assembly (2) is provided with a splitting ejector pin (21), which is located below the connection between the submerged gate (41) and the injection mold cavity (3); the splitting ejector pin (21) is used to eject the product (5) formed in the injection mold cavity (3), and a cutting edge (211) is provided on the outer side of the upper end of the splitting ejector pin (21), and the cutting edge (211) and the gate surface of the submerged gate (41) are in the same vertical plane, so that the splitting ejector pin (21) can cut off the water outlet (6) when ejecting the product (5).
2. The thin-walled product injection molding mold according to claim 1, characterized in that: The slitting ejector pin (21) is flat, so that a vertical flat surface (212) is formed on the outer side of the slitting ejector pin (21), and the cutting edge (211) is the edge of the upper end of the flat surface (212); when the slitting ejector pin (21) ejects the product (5), the flat surface (212) is ejected close to the gate surface.
3. The thin-walled product injection molding die according to claim 1 or 2, characterized in that: The width of the cutting edge (211) is greater than the width of the nozzle (6) in the same direction, so that when the slitting ejector (21) ejects the product (5), the cutting edge (211) can completely cut off the nozzle (6) at one time.
4. The thin-walled product injection molding mold according to claim 3, characterized in that: The height of the connection portion between the water inlet (6) and the product (5) in the ejection direction of the slitting ejector pin (21) is less than half the height of the product (5) in the same area.