Injection mold gate structure

Abstract

This application discloses a gate structure for an injection mold, comprising a first end face, a first side face, a second side face, and a second end face. The first end of the first end face is connected to the outlet of a runner, and the second end of the first end face is connected to the second end face. The second end face is vertically positioned, with the first end face lower than the top surface of the outlet, and the first end of the first end face higher than the second end of the first end face. The first end of the first side face is connected to the outlet, and the second end of the first side face is connected to the second end face. The first end of the second side face is connected to the outlet, and the second end of the second side face is connected to the second end face. The distance between the first end of the first side face and the first end of the second side face is greater than the distance between the second end of the first side face and the second segment of the second side face. This injection mold gate structure, through the cooperation of the first end face, the first side face, and the second side face, forms a gradually changing runner cross-section. From the runner to the gate outlet, the runner has no sudden diameter changes or sharp corners, which can significantly reduce melt flow resistance and improve injection molding quality.

Description

Technical Field

[0001] This utility model relates to the field of plastic molds, and in particular to a gate structure for injection molds. Background Technology

[0002] A plastic mold is a tool for producing plastic products. During injection molding, the mold is clamped on the injection molding machine, and molten plastic is injected into the molding cavity and cooled and solidified inside the cavity. Then the upper and lower molds separate, and the product is ejected from the mold cavity and removed from the mold through the ejection system. Finally, the mold closes again for the next injection molding. The entire injection molding process is cyclical.

[0003] The gate of a plastic mold is a short, narrow channel that connects the runner and the mold cavity. It is the entrance for resin to be injected into the cavity. The shape, number, size, and location of the gate in the mold have a great influence on the quality of the plastic parts.

[0004] The existing gates result in obvious injection marks on the product surface after injection molding, which cannot be resolved by adjusting the machine, affecting product quality and causing poor injection molding quality. Utility Model Content

[0005] To address the related technical problems, the purpose of this utility model is to provide a gate structure for injection molds to solve the aforementioned issues.

[0006] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0007] A gate structure for an injection mold, wherein the gate structure is disposed on a runner, and includes a first end face, a first side face, a second side face, and a second end face, wherein:

[0008] The first end of the first end face is connected to the outlet of the diversion channel, the second end of the first end face is connected to the second end face, the second end face is set vertically, the first end face is lower than the top surface of the outlet, and the first end of the first end face is higher than the second end of the first end face.

[0009] The first end of the first side is connected to the discharge port, the second end of the first side is connected to the second end face, the first end of the second side is connected to the discharge port, the second end of the second side is connected to the second end face, and the distance between the first end of the first side and the first end of the second side is greater than the distance between the second end of the first side and the second segment of the second side.

[0010] Optionally, a chamfer is provided at the connection between the first end face, the first side face, the second side face, and the second end face.

[0011] Optionally, the first end of the second end face along the vertical direction is connected to the second end of the first end face, and the second end of the second end face along the vertical direction is set inward away from the first end of the second end face along the vertical direction.

[0012] Optionally, the first end of the first side in the vertical direction is connected to the first end of the first end face in the first horizontal direction, and the second end of the first side in the vertical direction is disposed outward away from the first end of the first side in the vertical direction.

[0013] Optionally, the first end of the second side in the vertical direction is connected to the second end of the first end face in the first horizontal direction, and the second end of the second side in the vertical direction is disposed outward away from the first end of the second side in the vertical direction.

[0014] Optionally, the gating structure is located on the panel or the sprue plate.

[0015] The beneficial effects of this utility model are as follows: Compared with the prior art, the injection mold gate structure provided by this utility model has the following beneficial effects:

[0016] 1. By using the inclined design of the first end face, combined with the shrinkage structure of the first and second sides, a gradual flow channel cross section is formed. From the runner to the gate outlet, there is no sudden change in diameter or sharp corner of the runner, which can greatly reduce the melt flow resistance and improve the injection molding quality.

[0017] 2. By setting the second end face vertically and making the gate outlet width smaller than the inlet, the connection surface between the gate solidified material and the plastic part after molding is extremely small. During the later separation, there is no need for strong tearing, which can avoid defects such as missing corners and burrs on the edge of the plastic part, and reduce the workload and cost of post-processing.

[0018] 3. By setting chamfers at the connection of the first end face, the first side face, the second side face, and the second end face, the sharp corner dead zone in the flow channel is eliminated, the melt is prevented from lingering at the sharp corners, and the injection molding quality is improved. Attached Figure Description

[0019] To more clearly illustrate and understand the technical solutions in the embodiments of this utility model, the accompanying drawings used in the background technology and embodiment description of this utility model will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the gate structure of an injection mold provided in an embodiment of the present invention;

[0021] Figure 2 This is a cross-sectional view of an injection mold gate structure provided in an embodiment of this utility model;

[0022] Figure 3 This is a partially enlarged view of a gate structure for an injection mold provided in an embodiment of this utility model;

[0023] Figure 4 This is a top view of an injection mold gate structure provided in an embodiment of this utility model. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] To facilitate understanding of this utility model, a more complete description of it will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model. It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there may be an intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of this utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] Please see Figures 1 to 4 As shown, this embodiment provides an injection mold gate structure 1, which includes a first end face 10, a first side face 20, a second side face 30, and a second end face 40. The first end of the first end face 10 is connected to the outlet of the runner, and the second end of the first end face 10 is connected to the second end face 40. The second end face 40 is vertically arranged, the first end face 10 is lower than the top surface of the outlet, and the first end of the first end face 10 is higher than the second end of the first end face 10. The first end of the first side face 20 is connected to the outlet, and the second end of the first side face 20 is connected to the second end face 40. The first end of the second side face 30 is connected to the outlet, and the second end of the second side face 30 is connected to the second end face 40. The distance between the first end of the first side face 20 and the first end of the second side face 30 is greater than the distance between the second end of the first side face 20 and the second end of the second side face 30.

[0027] As can be seen, the inclined design of the first end face 10, combined with the shrinking structure of the first side face 20 and the second side face 30, forms a gradually changing flow channel cross section. From the branch channel to the gate outlet, the flow channel has no sudden diameter change or sharp corner, which can greatly reduce the melt flow resistance and improve the injection molding quality. At the same time, the second end face 40 is set vertically, and the gate outlet width is smaller than the inlet, so that the connection surface between the gate solidified material and the plastic part after molding is extremely small. During the later separation, there is no need for strong tearing, which can avoid defects such as missing corners and burrs on the edge of the plastic part, and reduce the workload and cost of post-processing.

[0028] In one embodiment, a chamfer 50 is provided at the connection between the first end face 10, the first side face 20, the second side face 30, and the second end face 40.

[0029] It can be seen that by setting a chamfer 50 at the connection of the first end face 10, the first side face 20, the second side face 30 and the second end face 40, the sharp corner dead zone in the flow channel is eliminated, the melt is prevented from lingering at the sharp corner, and the injection molding quality is improved.

[0030] In one embodiment, the first end 41 of the second end face 40 in the vertical direction is connected to the second end of the first end face 10, and the second end 42 of the second end face 40 in the vertical direction is disposed inward away from the first end 41 of the second end face 40 in the vertical direction.

[0031] Specifically, the inside of the gate is the inner side, and the outside of the gate is the outer side.

[0032] As can be seen, the second end face 40 extends outward in the vertical direction, so that the direction of the melt jet from the gate outlet is closer to the cavity wall, rather than directly impacting the bottom of the cavity. This can avoid wear and scratches on the cavity wall caused by high-speed melt impact, and at the same time prevent defects in the plastic parts caused by "jet flow", ensuring a smooth and flat surface of the plastic parts and improving the injection molding quality.

[0033] In one embodiment, the first end 21 of the first side surface 20 along the vertical direction is connected to the first end of the first end face 10 along the first horizontal direction, and the second end 22 of the first side surface 20 along the vertical direction is disposed outward away from the first end 21 of the first side surface 20 along the vertical direction.

[0034] As can be seen, the second end of the first side 20 extends outward in the vertical direction, which works in conjunction with the inclined direction of the first end face 10 to make the flow channel form a three-dimensional gradual contraction in the two dimensions of "horizontal + vertical". The velocity field of the melt flow is more uniform and there are no sudden changes in local flow velocity, which can further reduce the internal stress of the plastic part caused by uneven melt shear.

[0035] In one embodiment, the first end 31 of the second side surface 30 along the vertical direction is connected to the second end of the first end face 10 along the first horizontal direction, and the second end 32 of the second side surface 30 along the vertical direction is disposed outward away from the first end 31 of the second side surface 30 along the vertical direction.

[0036] As can be seen, the second side 30 and the first side 20 adopt the same "vertical direction second end outward expansion" design, so that the flow channel is completely symmetrical in the first horizontal direction. The flow resistance obtained by the melt from the two side walls is consistent, which can avoid "melt flow deviation" caused by flow channel asymmetry, ensure uniform filling of each area of ​​the cavity, reduce the wall thickness deviation of the plastic part, and improve dimensional stability.

[0037] In one implementation, the gate structure 1 is formed on the panel or the sprue plate.

[0038] As can be seen, the gate structure can be flexibly installed on the panel or sprue plate, without being limited to specific components:

[0039] When installed on the panel: it simplifies mold opening and is compatible with simple mold structures such as "two-plate molds", reducing mold manufacturing costs; When installed on the sprue plate: it is compatible with complex molds such as "three-plate molds", meeting the production needs of multi-cavity molds and large plastic parts, and improving the degree of automation.

[0040] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0041] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above examples. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A gate structure for an injection mold, wherein the gate structure is disposed on a runner, characterized in that, The injection mold gate structure includes a first end face, a first side face, a second side face, and a second end face, wherein: The first end of the first end face is connected to the outlet of the diversion channel, the second end of the first end face is connected to the second end face, the second end face is vertically arranged, the first end face is lower than the top surface of the outlet, and the first end of the first end face is higher than the second end of the first end face. The first end of the first side is connected to the discharge port, the second end of the first side is connected to the second end face, the first end of the second side is connected to the discharge port, the second end of the second side is connected to the second end face, and the distance between the first end of the first side and the first end of the second side is greater than the distance between the second end of the first side and the second segment of the second side.

2. The injection mold gate structure according to claim 1, characterized in that, A chamfer is provided at the connection between the first end face, the first side face, the second side face, and the second end face.

3. The injection mold gate structure according to claim 1, characterized in that, The second end face is connected to the second end face of the first end face along the vertical direction at the first end face, and the second end face is disposed inward away from the first end face along the vertical direction at the second end face along the second end face.

4. The injection mold gate structure according to claim 3, characterized in that, The first end of the first side along the vertical direction is connected to the first end of the first end face along the first horizontal direction, and the second end of the first side along the vertical direction is disposed outward away from the first end of the first side along the vertical direction.

5. The injection mold gate structure according to claim 4, characterized in that, The second side is connected to the first end of the first end face along the first horizontal direction at the first end of the vertical direction, and the second side is disposed outward away from the first end of the second side along the vertical direction at the second end of the vertical direction.

6. The injection mold gate structure according to claim 1, characterized in that, The gating structure is located on the panel or sprue plate.

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