Injection mold runner structure
By introducing bent runners and guide runners into the injection mold runner structure, the filling flow direction of plastic liquid and the guidance of cold materials is improved, the problem of cold material spots and silver wire defects during injection molding is solved, and the appearance quality of plastic products is significantly improved.
Patent Information
- Application Number
- CN202421411393.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-06-19
AI Technical Summary
During the injection molding process, some forward cold materials cannot enter the cold material hole, resulting in the appearance defects such as cold material spots and silver wires, especially in plastic products with high appearance requirements.
An injection mold runner structure is designed, including the main flow channel, the first-stage splitter, the bent runner, the cold material storage hole, the guide flow channel and the second-stage splitter. The bent runner changes the filling flow direction of the plastic liquid, slows down the flow rate, and improves the guiding nature of the cold material through the guide runner to ensure that it enters the cold material storage hole.
It effectively slows down the flow rate of plastic liquid and reduces the possibility of forward cold material entering the secondary split channel and mold cavity directly, thereby significantly reducing defects such as cold material spots and silver wires on the appearance of plastic products.
Smart Images
Figure CN222727264U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of polymer injection mold molding, in particular to a flow channel structure of an injection mold. Background Art
[0002] Injection molding refers to filling the mold cavity with molten plastic liquid, and then going through the stages of pressure holding, cooling, mold opening and demolding to finally obtain a molded plastic product; wherein, the plastic liquid needs to pass through the runner cavity before filling the mold cavity, and the runner cavity includes a main runner and a branch runner; generally, in order to ensure the molding quality of the plastic product, a cold material hole is set at the end of the branch runner to store the front cold material of the plastic liquid.
[0003] However, in the actual injection filling process of plastic liquid, it is not possible to ensure that all the cold front material will enter the cold material hole, which means that some of the cold front material will enter the next runner and injection gate to enter the mold cavity, which seriously causes appearance defects such as cold material spots and silver wire on the appearance of the molded plastic product. This is especially true for plastic products with relatively high requirements for the appearance of the molded surface, such as the control surface shells, plastic back covers, buttons, etc. of various electronic equipment.
[0004] Therefore, there is an urgent need for a flow channel structure that can effectively reduce the amount of cold material entering the mold cavity. Utility Model Content
[0005] The utility model aims to overcome the deficiencies in the prior art and provide an injection mold flow channel structure that can effectively reduce the entry of cold front material into the mold cavity, thereby reducing defects on the appearance of plastic products.
[0006] The purpose of this utility model is achieved through the following technical solutions:
[0007] An injection mold runner structure, comprising:
[0008] Main stream;
[0009] The runner includes a primary runner and a secondary runner; one end of the primary runner is connected to the main runner, and a bending runner is formed at the other end of the primary runner, a cold material storage hole is formed in the bending runner, and the bending runner is connected to one end of the secondary runner, and the other end of the secondary runner is connected to the mold cavity, and a plurality of guide runners are spaced apart in the bending runner.
[0010] In one embodiment, the cross-sections of the main flow channel, the primary branch flow channel, and the secondary branch flow channel are all circular.
[0011] In one embodiment, the cross section of the guide channel is U-shaped or semicircular.
[0012] In one embodiment, the extension path of the guide channel is consistent with the extension path of the bending channel.
[0013] In one of the embodiments, a cold material pushing portion is provided at the connection point between the bending flow channel and one end of the secondary branch flow channel.
[0014] In one of the embodiments, a cold well is provided at the end of the main channel.
[0015] In one embodiment, the cold material well has a U-shaped structure.
[0016] In one embodiment, the diameter of the cold well is between 5 mm and 12 mm.
[0017] In one embodiment, the depth of the cold well is less than 6 mm.
[0018] Compared with the prior art, the utility model has at least the following advantages:
[0019] 1. By bending the flow channel to change the filling direction of the plastic liquid, the flow rate of the plastic liquid under pressure from the main channel and the first-level branch channel is effectively slowed down, avoiding excessive filling speed that causes most of the front cold material to directly transfer to the second-level branch channel and the mold cavity, thus effectively reducing the appearance defects such as cold material spots and silver wires on the appearance of plastic products.
[0020] 2. Guide channels are distributed at intervals between the curved channels to improve the guiding property of the curved channels in guiding the front cold material into the cold material storage cavity, ensuring that the subsequent plastic liquid with uniform temperature difference can be filled into the mold cavity through the secondary branch channels, so that the mold cavity can form a plastic product with a better appearance, thereby effectively reducing the defects of the appearance of the plastic product. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0022] Figure 1 A schematic structural diagram of a flow channel structure of an injection mold in an embodiment;
[0023] Figure 2 for Figure 1 Another structural schematic diagram of the injection mold runner structure shown;
[0024] Figure 3 for Figure 1A schematic diagram of a partial structure of a flow channel structure of an injection mold shown;
[0025] Figure numerals: injection mold runner structure 10; main runner 100; cold material well 110; branch runner 200; primary branch runner 210; curved runner 2110; cold material storage hole 2120; guide runner 2130; secondary branch runner 220; mold cavity 300; cold material pusher 400. DETAILED DESCRIPTION
[0026] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.
[0027] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.
[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0029] The present disclosure provides a flow channel structure of an injection mold, including a main flow channel and a branch flow channel. The branch flow channel includes a primary branch flow channel and a secondary branch flow channel; one end of the primary branch flow channel is connected to the main flow channel, and the other end of the primary branch flow channel is formed with a bending flow channel, and the bending flow channel is formed with a cold material storage hole, and the bending flow channel is connected to one end of the secondary branch flow channel, and the other end of the secondary branch flow channel is connected to the mold cavity, and the bending flow channel is spaced apart with a plurality of guide flow channels.
[0030] See also Figures 1 to 3 In order to better understand the injection mold runner structure 10 of the present application, the injection mold runner structure 10 is further explained below:
[0031] An injection mold runner structure 10 of one embodiment includes a main runner 100 and a branch runner 200. The branch runner 200 includes a primary branch runner 210 and a secondary branch runner 220; one end of the primary branch runner 210 is connected to the main runner 100, and the other end of the primary branch runner 210 is formed with a bending runner 2110, and the bending runner 2110 is formed with a cold material storage hole 2120, and the bending runner 2110 is connected to one end of the secondary branch runner 220, and the other end of the secondary branch runner 220 is connected to the mold cavity 300, and the bending runner 2110 is spaced apart with a plurality of guide runners 2130.
[0032] In this embodiment, the filling direction of the plastic liquid is changed by bending the flow channel 2110, thereby effectively slowing down the flow rate of the plastic liquid that is pressurized and filled from the main channel 100 and the first-level branch channel 210, thereby avoiding excessively fast filling speed causing most of the front cold material to directly transfer into the second-level branch channel 220 and the mold cavity 300, thereby effectively reducing the appearance defects such as cold material spots and silver wires on the appearance of the plastic product.
[0033] Furthermore, guide channels 2130 are distributed at intervals in the curved channel 2110 to improve the guiding property of the curved channel 2110 in guiding the front cold material into the cold material storage hole 2120, ensuring that the subsequent plastic liquid with uniform temperature difference can be filled into the mold cavity 300 through the secondary branch channel 220, so that the mold cavity 300 can form a plastic product with a better appearance, thereby effectively reducing the defects of the appearance of the plastic product.
[0034] like Figures 1 to 3 As shown, in one embodiment, the cross-sections of the main flow channel 100, the primary branch flow channel 210 and the secondary branch flow channel 220 are all circular. In one embodiment, the cross-section of the guide flow channel 2130 is U-shaped or semicircular.
[0035] It can be understood that the circular or semicircular flow channel design can maximize the flow rate of the molten plastic liquid, while also effectively reducing the heat loss rate of the molten plastic liquid during the filling stage.
[0036] like Figures 1 to 3 As shown, in one embodiment, the extension path of the guide channel 2130 is consistent with the extension path of the bending channel 2110. In one embodiment, a cold material pusher 400 is provided at the connection point between the bending channel 2110 and one end of the secondary branch channel 220.
[0037] It can be understood that the extension path of the guide channel 2130 is consistent with the extension path of the bending channel 2110, which is conducive to the multiple guide channels 2130 to jointly improve the drainage effect of the bending channel 2110, and slow down the flow rate of the plastic liquid, so that the front cold material can better enter the cold material storage hole 2120, thereby effectively reducing the front cold material directly transferred to the secondary branch channel 220 and the mold cavity 300, and then effectively reducing the appearance defects such as cold material spots and silver wires on the appearance of the plastic product. Among them, the setting of the cold material pusher 400 can also provide a filling space for the front cold material, and at the same time, a cold material pusher (not shown) can be set at the lower end of the cold material pusher 400 to push the injection mold runner structure 10 from the rear mold (not shown) during the demolding stage.
[0038] like Figures 1 to 3 As shown, in one embodiment, a cold well 110 is provided at the end of the main channel 100. In one embodiment, the cold well 110 is in a U-shaped structure.
[0039] It is understandable that the U-shaped cold well 110 can realize automatic demoulding of the plastic product when the mold is opened, without manual or mechanical grasping. In other embodiments, the shape of the cold well 110 can also be a Z-shaped structure.
[0040] like Figures 1 to 3 As shown, in one embodiment, the diameter of the cold well 110 is between 5 mm and 12 mm. In one embodiment, the depth of the cold well 110 is less than 6 mm.
[0041] It can be understood that the diameter and depth of the cold well 110 required for a smaller plastic product are not limited to the size range in this embodiment; in this embodiment, the setting of the cold well 110 can effectively reduce the problem of the front cold material filling into the next branch channel 200, ensuring that the mold cavity 300 can form a plastic product with a better appearance.
[0042] Compared with the prior art, the utility model has at least the following advantages:
[0043] 1. By bending the flow channel to change the filling direction of the plastic liquid, the flow rate of the plastic liquid under pressure from the main channel and the first-level branch channel is effectively slowed down, avoiding excessive filling speed that causes most of the front cold material to directly transfer to the second-level branch channel and the mold cavity, thus effectively reducing the appearance defects such as cold material spots and silver wires on the appearance of plastic products.
[0044] 2. Guide channels are distributed at intervals between the curved channels to improve the guiding property of the curved channels in guiding the front cold material into the cold material storage cavity, ensuring that the subsequent plastic liquid with uniform temperature difference can be filled into the mold cavity through the secondary branch channels, so that the mold cavity can form a plastic product with a better appearance, thereby effectively reducing the defects of the appearance of the plastic product.
[0045] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. An injection mold runner structure, characterized in that: include: Main stream; A diversion channel, including a primary diversion channel and a secondary diversion channel; One end of the first-level branch channel is connected to the main channel, and the other end of the first-level branch channel forms a bent channel, and the bent channel forms a cold material storage hole. The bent channel is connected to one end of the second-level branch channel, and the other end of the second-level branch channel is connected to the mold cavity. The bent channel has multiple guide channels spaced apart.
2. The injection mold runner structure according to claim 1, characterized in that: The cross sections of the main flow channel, the primary branch flow channel and the secondary branch flow channel are all circular.
3. The injection mold runner structure according to claim 1, characterized in that: The cross section of the guide flow channel is U-shaped or semicircular.
4. The injection mold runner structure according to claim 1, characterized in that: The extension path of the guide flow channel is consistent with the extension path of the bending flow channel.
5. The injection mold runner structure according to claim 1, characterized in that: A cold material pushing portion is provided at a connection point between the bending flow channel and one end of the secondary branch flow channel.
6. The injection mold runner structure according to claim 1, characterized in that: A cold material well is provided at the end of the main channel.
7. The injection mold runner structure according to claim 6, characterized in that: The cold material well is in a U-shaped structure.
8. The injection mold runner structure according to claim 6, characterized in that: The diameter of the cold well is between 5 mm and 12 mm.
9. The injection mold runner structure according to claim 6, characterized in that: The depth of the cold material well is less than 6 mm.