Die structure for preventing radiating fin from sticking to die

Abstract

The utility model discloses a mold structure for preventing a radiating fin from sticking to a mold. The mold structure comprises a rear mold core, the positioning insert is fixedly mounted on the rear mold core; the positioning insert is provided with a plurality of grooves, and the grooves are matched with fins of the cooling fins in a concave-convex mode and used for containing the fins of the cooling fins; the section of the groove is of a trapezoidal structure, and the area of the section of the groove is gradually reduced from top to bottom. According to the utility model, the grooves for positioning the fins of the radiating fins are designed into the trapezoidal structures which are gradually reduced from top to bottom, so that the mold stripping angles of the grooves are increased, and meanwhile, the space is increased to enable the fins to be subjected to thermal expansion deformation, so that the situation that the fins are adhered to a mold due to over-tight adhesion with the grooves after thermal expansion deformation is avoided, and a product can be easily ejected out.

Description

Technical Field

[0001] This utility model relates to the technical field of molds, and in particular to a mold structure for preventing heat sinks from sticking to the mold. Background Technology

[0002] A certain product includes a heat sink. During injection molding, the heat sink needs to be placed inside the mold and then injected together with the other parts of the product. During injection molding, because the heat sink adheres closely to the mold and the high temperatures generated during injection, the heat sink expands after injection, causing its fins to stick to the mold. This results in deformation of the mold portion where the fins are attached, making it impossible to reinsert the heat sink for injection. Normally, increasing the ejection force is tried, but this does not solve the problem. Summary of the Invention

[0003] The main purpose of this invention is to provide a mold structure that prevents heat sinks from sticking to the mold, thereby solving the problems in the prior art.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] This utility model discloses a mold structure for preventing heat sinks from sticking to the mold, comprising:

[0006] Post-model kernel;

[0007] A positioning insert is fixedly installed on the rear mold core; the positioning insert has multiple grooves, which engage with the fins of the heat sink to accommodate the fins of the heat sink; the cross-sectional shape of the groove is trapezoidal, and the cross-sectional area of ​​the groove gradually decreases from top to bottom.

[0008] Compared with the prior art, the mold structure disclosed in this utility model for preventing heat sink fins from sticking to the mold is designed with a trapezoidal structure that gradually decreases in size from top to bottom for positioning the heat sink fins. This increases the ejection angle of the groove and increases the space for thermal expansion deformation of the fins. In this way, the fins will not stick too tightly to the groove after thermal expansion deformation, thus preventing sticking to the mold and making it easy to eject the product.

[0009] In a preferred embodiment, the positioning insert has mounting holes located within the layout range of the plurality of grooves.

[0010] In a preferred embodiment, the positioning insert has two positioning holes to position the two through holes of the heat sink, respectively.

[0011] In a preferred embodiment, the mold structure for placing the heat sink adhesive mold further includes an ejector pin and an ejector plate. The ejector plate is located below the rear mold core. One end of the ejector pin is fixed to the ejector plate, and the other end of the ejector pin passes through the rear mold core and at least one of the positioning holes. The ejector pin protrudes from the positioning hole.

[0012] In a preferred embodiment, the ejector pin is only inserted through one of the positioning holes; the mold structure for placing the heat sink adhesive mold also includes a positioning pin, which is fixed on the rear mold core, and the positioning pin is inserted through and protrudes from one of the positioning holes, and the positioning pin is offset from the ejector pin.

[0013] To better understand and implement this invention, the following diagram, in conjunction with the accompanying drawings, provides a detailed description. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the mold structure to prevent the heat sink from sticking to the mold and the exploded structure of the heat sink;

[0016] Figure 2 This is a schematic diagram of a mold structure that places the heat sink in order to prevent it from sticking to the mold.

[0017] Figure 3 It is a cross-sectional view of the positioning insert and the ejector pin in action.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Rear mold core, 2. Positioning insert, 21. Groove, 22. Mounting hole, 23. Positioning hole, 3. Ejector pin, 4. Positioning pin, A. Heat sink, A1. Fin, A2. Through hole. Detailed Implementation

[0020] To better illustrate this utility model, a further detailed description of this utility model is provided below with reference to the accompanying drawings.

[0021] It should be understood that the described embodiments are merely some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of the embodiments of this application.

[0022] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0023] See Figures 1 to 3 This utility model discloses a mold structure for preventing heat sinks from sticking to the mold, comprising:

[0024] Post-mold kernel 1;

[0025] The positioning insert 2 is fixedly installed on the rear mold core 1; the positioning insert 2 has a plurality of grooves 21, which are in concave-convex fit with the fins of the heat sink to place the fins A1 of the heat sink A; the cross-sectional shape of the groove 21 is trapezoidal, and the cross-sectional area of ​​the groove 21 gradually decreases from top to bottom.

[0026] Compared with the prior art, the mold structure disclosed in this utility model for preventing heat sink fins from sticking to the mold is designed with the groove 21 for positioning the heat sink fins as a trapezoidal structure that gradually decreases in size from top to bottom. This increases the ejection angle of the groove 21 and increases the space for the thermal expansion deformation of the fins A1. In this way, after the fins expand and deform, they will not stick too tightly to the groove 21 and stick to the mold, and the product can be easily ejected.

[0027] In this embodiment, the positioning insert 2 has a mounting hole 22 located within the layout range of the plurality of grooves 21. Thus, without affecting the positioning of the fin A1 by the grooves 21, the positioning insert 2 is fixed by screws passing through the mounting hole 22 and connecting to the rear mold core 1. The fixed screws need to be lower than the bottom surface of the grooves 21 so that the screws and the fins do not touch each other. The mounting hole 22 is set within the layout range of the plurality of grooves 21, eliminating the need to provide additional space for the mounting hole 22 and minimizing the volume of the positioning insert 2.

[0028] In this embodiment, the positioning insert 2 has two positioning holes 23 to position the two through holes A2 of the heat sink respectively. In addition, the fins A1 and the groove 21 are engaged to position the entire heat sink and ensure that the installation position of the heat sink is accurate.

[0029] Furthermore, the mold structure for placing the heat sink sticking to the mold also includes an ejector pin 3 and an ejector plate. The ejector plate is located below the rear mold core 1. One end of the ejector pin 3 is fixed to the ejector plate, and the other end of the ejector pin 3 passes through the rear mold core 1 and at least one of the positioning holes 23. The ejector pin 3 protrudes from the positioning hole 23. The ejector pin 3 can be used to position the positioning hole 23, facilitating the placement of the heat sink onto the positioning insert 2. On the other hand, during demolding, the ejector plate can drive the ejector pin 3 to move upward, generating an upward force on the heat sink, increasing the force on the heat sink, and causing the heat sink to separate from the rear mold core, thereby solving the problem of heat sink sticking to the mold.

[0030] Furthermore, since the heat sink of this utility model is small in size, only one ejector pin 3 is needed to eject the heat sink. Therefore, the ejector pin 3 is only inserted through one of the positioning holes 23. The mold structure for placing the heat sink adhesive mold also includes a positioning pin 4, which is fixed on the rear mold core 1. The positioning pin 4 is inserted through and protrudes from one of the positioning holes 23. The positioning pin 4 is offset from the ejector pin 3. The positioning pin 4 is used to position the other positioning hole 23.

[0031] This utility model is not limited to the above-described embodiments. If any modifications or variations to this utility model do not depart from the spirit and scope of this utility model, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this utility model, then this utility model also intends to include such modifications and variations.

Claims

1. A mold structure for preventing heat sinks from sticking to the mold, characterized in that, include: Post-model kernel; A positioning insert is fixedly installed on the rear mold core; The positioning insert has multiple grooves, which engage with the fins of the heat sink to accommodate the fins; the cross-sectional shape of the grooves is trapezoidal, and the cross-sectional area of ​​the grooves gradually decreases from top to bottom.

2. The mold structure for preventing heat sink sticking to the mold according to claim 1, characterized in that: The positioning insert has mounting holes located within the layout of the plurality of grooves.

3. The mold structure for preventing heat sink sticking to the mold according to claim 1, characterized in that: The positioning insert has two positioning holes to position the two through holes of the heat sink, respectively.

4. The mold structure for preventing heat sink sticking to the mold according to claim 3, characterized in that: The mold structure for preventing heat sinks from sticking to the mold also includes ejector pins and ejector plate. The ejector plate is located below the rear mold core. One end of the ejector pin is fixed to the ejector plate, and the other end of the ejector pin passes through the rear mold core and at least one of the positioning holes. The ejector pin protrudes from the positioning hole.

5. The mold structure for preventing heat sink sticking to the mold according to claim 4, characterized in that: The ejector pin is inserted through only one of the positioning holes; The mold structure for preventing heat sink from sticking to the mold also includes a positioning pin, which is fixed on the rear mold core. The positioning pin passes through and protrudes from one of the positioning holes, and the positioning pin is offset from the ejector pin.

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