Die-casting die runner structure

Abstract

A runner structure of a die-casting die adopts a three-layer structure of a cover die, a front die and a rear die from top to bottom, a plurality of branch-shaped main runners are arranged in the cover die, a plurality of conical branch runners are vertically arranged in the front die, and the lower ends of the branch runners are communicated to a cavity between the front die and the rear die. In the process that molten metal enters the cavity through the sub-runner, the molten metal flows downwards to the cavity between the front mold and the rear mold under the combined action of liquid injection pressure and gravity, so that the liquid injection speed can be increased, the filling time of the cavity can be shortened, the requirement for the liquid injection pressure can be reduced, the stress strain of a die casting in the cavity is reduced, and the production efficiency is improved. Furthermore, the deformation amount of a large thin-wall product is reduced, the flatness of the product is improved, the CNC machining requirement is also reduced, and the product quality of a die casting is effectively improved.

Description

Technical Field

[0001] The utility model relates to mold casting, in particular to a flow channel structure used in a die-casting mold. Background Art

[0002] A die-casting mold is a tool used to cast metal parts. The side of the mold is equipped with a flow channel that connects to the internal cavity. After the molten metal flows into the cavity along the flow channel and cools and solidifies, the mold is removed and the casting is processed. However, since the filling method of injecting molten metal from the side requires a high filling pressure, large deformation is easily generated when die-casting large, thin-walled products with large dimensions and small thickness. This results in low flatness machining accuracy of the die-cast parts, resulting in an excessively high rejection rate. Many qualified products also require CNC machining to meet the flatness requirements. CNC machining of die-cast parts with complex structures is also extremely difficult, which not only increases production costs but also makes it impossible to effectively process die-cast parts that meet the requirements. Utility Model Content

[0003] The purpose of the utility model is to provide a die-casting mold flow channel structure with a relatively low filling pressure, so as to reduce the processing difficulty of thin-wall products, improve the product quality of die-casting parts, and reduce production costs.

[0004] The die-casting mold flow channel structure described in the present invention includes a front mold and a rear mold arranged opposite to each other in the upper and lower directions, the bottom surface of the front mold and the top surface of the rear mold are arranged opposite to each other with a cavity for die-casting, and the front mold is vertically provided with a plurality of branch flow channels connected to the cavity; there is also a cover mold arranged above the front mold, the cover mold is provided with a liquid injection port for injecting molten metal, and the cover mold is provided with a plurality of main flow channels respectively connected to the liquid injection port and different branch flow channels.

[0005] Furthermore, the vertical cross-section of the main channel is trapezoidal.

[0006] Alternatively, the vertical cross-section of the main channel is circular.

[0007] Furthermore, the transverse diameter of the branch channel gradually increases from top to bottom.

[0008] Furthermore, the branch channel is in a cone shape, and the top of the cone is connected to the bottom of the main channel.

[0009] The die-casting mold flow channel structure described in the present invention adopts a three-layer structure of a cover mold, a front mold and a rear mold from top to bottom. The molten metal is injected from the injection port of the cover mold and then flows into multiple branch-shaped main channels respectively, and then flows from each main channel into the branch channel in the front mold. In the branch channel, the molten metal is simultaneously subjected to the combined action of the injection pressure and gravity and flows downward to the cavity between the front mold and the rear mold. This can not only increase the injection speed and reduce the filling time of the cavity, but also reduce the need for injection pressure, thereby reducing the stress and strain of the die-casting in the cavity, and further reduce the deformation of large thin-walled products, improve the flatness of the product, and also reduce the need for CNC processing, effectively improving the product quality of the die-casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the runner structure of the die-casting mold.

[0011] Figure 2 It is a schematic diagram of the internal structure of the die-casting mold runner structure. DETAILED DESCRIPTION

[0012] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0013] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0014] If there are descriptions involving "first" or "second" in the embodiments of the present invention, the descriptions of "first" or "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0015] The utility model provides a flow channel structure of a die-casting mold.

[0016] The die-casting mold flow channel structure of this embodiment includes a front mold 1 and a rear mold 2 arranged opposite to each other in the upper and lower directions. The bottom surface of the front mold and the top surface of the rear mold are oppositely provided with a cavity 7 for die-casting. The front mold is vertically provided with a plurality of branch channels 3 connecting the cavity; there is also a cover mold 4 arranged above the front mold, and the cover mold is provided with a liquid injection port 5 for injecting molten metal, and the cover mold is provided with a plurality of main channels 6 respectively connecting the liquid injection port and different branch channels.

[0017] The die-casting mold flow channel structure adopts a three-layer structure of a cover mold, a front mold and a rear mold from top to bottom. The molten metal is injected from the injection port of the cover mold, and then flows into multiple branch-shaped main channels respectively, and then flows from each main channel into the branch channel in the front mold. In the branch channel, the molten metal is simultaneously affected by the combined action of the injection pressure and gravity and flows downward to the cavity between the front mold and the rear mold. After the cavity is filled and cooled, the required die-casting part is formed.

[0018] In the die-casting mold's runner structure, the vertical cross-section of the main runner 6 can be circular or trapezoidal. The trapezoidal shape allows the molten metal to be more quickly concentrated at the bottom of the trapezoid, thereby increasing the injection speed. The branch runner 3, for example, has a gradually increasing transverse diameter from top to bottom, such as a conical shape with the top of the cone connected to the trapezoidal bottom of the main runner 6. This reduces the contact area between the main runner and the branch runner, allowing it to be broken with less force after the molten metal cools. Furthermore, the conical metal column within the branch runner can be easily separated from the front mold, thereby improving the ease of demolding.

[0019] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A die-casting mold flow channel structure, comprising a front mold (1) and a rear mold (2) arranged opposite to each other, characterized in that: The bottom surface of the front mold and the top surface of the rear mold are oppositely provided with a cavity (7) for die casting, and the front mold is provided with a plurality of branch channels (3) connected to the cavity along the vertical direction; there is also a cover mold (4) arranged above the front mold, and the cover mold is provided with a liquid injection port (5) for injecting molten metal, and the cover mold is provided with a plurality of main channels (6) respectively connected to the liquid injection port and different branch channels.

2. The die-casting mold flow channel structure according to claim 1, characterized in that: The vertical cross-section of the main channel (6) is a trapezoid.

3. The die-casting mold flow channel structure according to claim 1, characterized in that: The vertical cross-section of the main channel (6) is circular.

4. The die-casting mold flow channel structure according to claim 1, 2 or 3, characterized in that: The transverse diameter of the branch channel (3) gradually increases from top to bottom.

5. The die-casting mold flow channel structure according to claim 4, characterized in that: The branch channel (3) is conical, and the top of the cone is connected to the bottom of the main channel (6).

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