A rivet pressing jig for preventing rivet skewing

Abstract

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Description

Technical Field

[0001] This utility model relates to the field of riveting fixture technology, and in particular to a riveting fixture for preventing rivet misalignment. Background Technology

[0002] In the field of heat dissipation for electronic devices, the mechanical connection between heat sinks and substrates or other components typically employs riveting. This process requires pre-riveting and fixing the rivets to the heat sink for subsequent overall assembly. However, during traditional riveting, the rivets are prone to radial offset or tilting due to insufficient positioning accuracy of the fixture or uneven distribution of stamping force. After riveting, misaligned rivets may cause misalignment of the mounting holes between the heat sink and the substrate, or even structural interference. This necessitates manual rework for correction, which not only increases labor costs but also significantly reduces production efficiency, making it difficult to meet the demands of large-scale manufacturing.

[0003] To address the aforementioned issues, the industry commonly employs a method of reducing the diameter of the riveting hole (avoidance hole) on the riveting fixture, for example, designing the hole diameter to be 0.1mm to 0.2mm larger than the rivet diameter. This solution, through the mechanical restraint of the riveting hole on the rivet, can correct the rivet's posture during the stamping process and reduce skewing. However, this method has the following derivative problems:

[0004] Rivet surface damage: Smaller rivet hole clearance leads to frequent friction between the hole wall and the rivet outer wall, especially under high-speed stamping conditions. The upper edge of the rivet hole is easily scratched on the rivet surface, affecting its mechanical properties and corrosion resistance. Rivet jamming and material removal difficulties: Insufficient hole clearance may cause the rivet to become stuck in the rivet hole due to plastic deformation or material adhesion, making it difficult to remove the rivet.

[0005] In the process of developing this utility model, the applicant discovered at least the following problems in the prior art:

[0006] Currently, there is an urgent need for a riveting fixture that can ensure the positioning accuracy of rivets while avoiding rivet damage and jamming. Utility Model Content

[0007] The purpose of this utility model is to provide a riveting fixture that prevents rivet misalignment, thereby solving the technical problem in the prior art of needing a riveting fixture that can ensure rivet positioning accuracy while avoiding rivet damage and jamming. The various technical effects of the preferred technical solutions provided by this utility model are detailed below.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] This utility model provides a riveting fixture for preventing rivet misalignment, used for riveting parts; it includes an upper die and a lower die disposed below the upper die; the upper die has at least one riveting post on the side facing the lower die; the lower die has a riveting hole corresponding to the riveting post on the side facing the upper die; the riveting hole is a stepped conical hole or a conical hole.

[0010] Optionally, a base is provided at the bottom of the lower mold; the lower mold is fixedly connected to the base.

[0011] Optionally, the base is provided with an elastic device and a spring placement hole; the elastic device is fixedly connected to the base through the spring placement hole and is used to lift the part to be riveted after riveting is completed.

[0012] Optionally, the elastic device includes a spring; one end of the spring is fixedly connected to a support member for supporting the part to be riveted; the lower die is provided with a spring guide hole, and the elastic device is placed in the spring placement hole and the spring guide hole; the top plane of the support member is higher than the upper surface of the lower die.

[0013] Optionally, the number of elastic devices is four; the four elastic devices are symmetrically arranged in pairs on the base.

[0014] Optionally, the lower die is provided with a plurality of positioning posts on the side facing the upper die; the plurality of positioning posts are evenly distributed around the part to be riveted.

[0015] Optionally, the number of positioning posts is 8; each side of the part to be riveted is provided with 2 positioning posts.

[0016] Optionally, the surface of the rivet hole is machined by mirror EDM.

[0017] Optionally, the upper mold is further provided with at least one guide post; the lower mold is provided with a guide hole corresponding to the guide post.

[0018] Optionally, the lower die is further provided with gripper grooves; the gripper grooves are located on both sides of the part to be riveted.

[0019] Implementing one of the above-described technical solutions of this utility model has the following advantages or beneficial effects:

[0020] The riveting fixture provided by this utility model has a tapered riveting hole. Because the tapered shape is wider at the top and narrower at the bottom, the hole wall can not only correct the rivet during the riveting process, preventing rivet damage and rivet misalignment after riveting, thus achieving precise positioning, but also makes it easier for the rivet to detach from the fixture, avoiding the problem of the rivet being too tightly stuck in the riveting hole, which would make it difficult to unload the rivet. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0022] Figure 1 This is a schematic diagram of the riveting fixture according to an embodiment of the present invention;

[0023] Figure 2 This is an exploded view of the riveting fixture according to an embodiment of this utility model;

[0024] Figure 3 This is a cross-sectional view of the riveting fixture according to an embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram of the shape of the riveting hole in an embodiment of this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the rivet according to an embodiment of the present invention;

[0027] In the diagram: 1. Upper mold; 11. Riveting post; 12. Guide post; 2. Lower mold; 21. Riveting hole; 22. Positioning post; 23. Spring limiting hole; 24. Guide hole; 25. Grip groove; 3. Elastic device; 31. Spring; 32. Support; 4. Base; 41. Spring placement hole; 5. Rivet; 6. Part to be riveted. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, various exemplary embodiments described below will be referenced to the accompanying drawings, which form part of the exemplary embodiments, illustrating various exemplary embodiments that may be adopted to implement this utility model. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. It should be understood that they are merely examples of processes, methods, and apparatuses consistent with some aspects of this utility model disclosed as detailed in the appended claims, and other embodiments may be used, or structural and functional modifications may be made to the embodiments listed herein without departing from the scope and spirit of this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the referred element must have a specific orientation, or be constructed and operated in a specific orientation. The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. The term "multiple" means two or more. The terms "connected" and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, integral connections, mechanical connections, electrical connections, communication connections, direct connections, indirect connections through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more of the related listed items. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] To illustrate the technical solution described in this utility model, specific embodiments are described below, showing only the parts related to the embodiments of this utility model.

[0031] Example 1:

[0032] like Figure 1-4 As shown, this utility model provides a riveting fixture to prevent rivet misalignment, used for riveting a part 6 to be riveted; preferably, the part 6 to be riveted is a heat sink. It includes an upper mold 1 and a lower mold 2 disposed below the upper mold 1; the side of the upper mold 1 facing the lower mold 2 is provided with at least one riveting post 11 for riveting rivets 5 on the heat sink; the side of the lower mold 2 facing the upper mold 1 is provided with a riveting hole 21 corresponding to the riveting post 11; the shape of the riveting hole 21 is a stepped conical hole or a conical hole. Figure 3As shown, the upper mold 1 and lower mold 2 together complete the riveting of the heat sink. During riveting, the heat sink is placed on the lower mold 2, and the rivets 5 on the heat sink enter the riveting hole 21. The riveting post 11 on the upper mold 1 is aligned with the rivets 5 and the riveting hole 21 to rivet the rivets 5 on the heat sink. During the riveting process, any misaligned rivets 5 can be corrected by the wall of the stepped tapered hole in the riveting hole 21 to prevent the rivets 5 from becoming misaligned after riveting. Figure 4 As shown, the riveting hole 21 is preferably a stepped tapered hole, which can achieve segmented and progressive guidance of the rivet 5. During the riveting process, the rivet 5 can be corrected step by step from top to bottom. Even if the rivet 5 is severely misaligned, its position can be corrected relatively gently, thereby effectively protecting the bottom surface of the rivet 5 (some rivet surfaces are treated with special coatings such as rust prevention) from scratches. The stepped tapered hole can be set to two or more segments, depending on the actual situation. When the surface protection requirements of the rivet 5 are not particularly strict, the riveting hole 21 can also be set as a standard tapered hole, which can also achieve the guiding function of the rivet 5. The riveting hole can also be set as a frustum-shaped hole, which is similar to the tapered hole and can also achieve the guiding function of the rivet 5. In order for the rivet 5 to be better riveted to the heat sink, the following can be used: Figure 5 The rivet 5 shown has a chamfered bottom, which makes it easier to move downwards in conjunction with the rivet hole 21.

[0033] The riveting fixture provided in this embodiment, by setting a tapered riveting hole 21, has a tapered structure that is wider at the top and narrower at the bottom. This allows the hole wall of the riveting hole 21 to correct the rivet 5 during the riveting process, preventing damage or misalignment of the rivet 5 after riveting and achieving precise positioning. It also makes it easier for the rivet 5 to detach from the fixture, avoiding the problem of the rivet 5 being too tightly locked in the riveting hole 21, which would make it difficult to unload the material.

[0034] As an alternative implementation, a base 4 is provided at the bottom of the lower mold 2; the lower mold 2 is fixedly connected to the base 4. The base 4 can support the lower mold 2, increasing the stability of the fixture.

[0035] Furthermore, such as Figure 2 As shown, the base 4 is provided with a spring device 3 and a spring placement hole 41; the spring device 3 is fixedly connected to the base 4 through the spring placement hole 41, and is used to lift the part 6 to be riveted after riveting is completed. The spring device 3 can lift the heat sink after riveting, which can further prevent the rivet 5 from getting stuck in the riveting hole 21 after riveting, and make it easier to unload the part.

[0036] Furthermore, the elastic device 3 includes a spring 31; one end of the spring 31 is fixedly connected to a support member 32 for supporting the part 6 to be riveted; a spring limiting hole 23 is provided on the lower mold 2, and the elastic device 3 is placed in the spring placement hole 41 and the spring limiting hole 23; the top plane of the support member 32 is higher than the upper surface of the lower mold 2. The top plane of the support member 32 being higher than the upper surface of the lower mold 2 is necessary to eject the heat sink.

[0037] Furthermore, there are four elastic devices 3; the four elastic devices 3 are symmetrically arranged in pairs on the base 4. The symmetrical arrangement of the four elastic devices 3, forming the four corners of a square, helps to increase the rebound force and the stability of the support.

[0038] As an alternative implementation, the lower mold 2 is further provided with a plurality of positioning posts 22 on the side facing the upper mold 1; the plurality of positioning posts 22 are evenly distributed around the part 6 to be riveted. The positioning posts 22 make it easier to position the heat sink.

[0039] Furthermore, there are 8 positioning posts; each side of the part 6 to be riveted has 2 positioning posts 22. The positioning posts 22 are evenly distributed around the heat sink to enhance the stability and accuracy of the positioning.

[0040] As an alternative implementation, the surface of the crimping hole 21 is mirror-finished by electrical discharge machining (EDM). Mirror-finish EDM enhances the smoothness, wear resistance, and service life of the crimping hole 21.

[0041] As an alternative implementation, the upper mold 1 is further provided with at least one guide post 12; the lower mold 2 is provided with a guide hole 24 corresponding to the guide post 12. The upper mold 1 and the lower mold 2 are aligned, and the guide post 12 of the upper mold 1 can just enter the guide hole 24 of the lower mold 2. The cooperation between the guide post 12 and the guide hole 24 can increase the stability of riveting.

[0042] As an alternative implementation, the lower mold 2 is also provided with gripper grooves 25; the gripper grooves 25 are located on both sides of the part 6 to be riveted. The gripper grooves 25 facilitate manual gripping of the heat sink for loading or unloading operations.

[0043] The embodiment is merely a special case and does not indicate that this utility model is implemented in such a way.

[0044] The above description is merely a preferred embodiment of the present utility model. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present utility model. Furthermore, under the teachings of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present utility model.

Claims

1. A riveting fixture for preventing rivet misalignment, used for riveting parts (6) to be riveted; characterized in that, It includes an upper mold (1) and a lower mold (2) disposed below the upper mold (1); the upper mold (1) has at least one riveting post (11) on the side facing the lower mold (2); the lower mold (2) has a riveting hole (21) corresponding to the riveting post (11) on the side facing the upper mold (1); the riveting hole (21) is in the shape of a stepped conical hole or a conical hole.

2. The riveting fixture for preventing rivet misalignment according to claim 1, characterized in that, The lower mold (2) is provided with a base (4) at its bottom; the lower mold (2) is fixedly connected to the base (4).

3. A riveting fixture for preventing rivet misalignment according to claim 2, characterized in that, The base (4) is provided with an elastic device (3) and a spring placement hole (41); the elastic device (3) is fixedly connected to the base (4) through the spring placement hole (41) and is used to lift the part to be riveted (6) after riveting is completed.

4. A riveting fixture for preventing rivet misalignment according to claim 3, characterized in that, The elastic device (3) includes a spring (31); one end of the spring (31) is fixedly connected to a support member (32) for supporting the part to be riveted (6); a spring limiting hole (23) is provided on the lower mold (2), and the elastic device (3) is placed in the spring placement hole (41) and the spring limiting hole (23); the top plane of the support member (32) is higher than the upper surface of the lower mold (2).

5. A riveting fixture for preventing rivet misalignment according to claim 3, characterized in that, The number of elastic devices (3) is 4; the 4 elastic devices (3) are symmetrically arranged in pairs on the base (4).

6. A riveting fixture for preventing rivet misalignment according to claim 1, characterized in that, The lower mold (2) is provided with a plurality of positioning posts (22) on the side facing the upper mold (1); the plurality of positioning posts (22) are evenly distributed around the part to be riveted (6).

7. A riveting fixture for preventing rivet misalignment according to claim 6, characterized in that, The number of positioning posts (22) is 8; each side of the part to be riveted (6) is provided with 2 positioning posts (22).

8. A riveting fixture for preventing rivet misalignment according to claim 1, characterized in that, The surface of the rivet hole (21) is processed by mirror EDM.

9. A riveting fixture for preventing rivet misalignment according to claim 1, characterized in that, The upper mold (1) is also provided with at least one guide post (12); the lower mold (2) is provided with a guide hole (24) corresponding to the guide post (12).

10. A riveting fixture for preventing rivet (5) from skewing according to claim 1, characterized in that, The lower mold (2) is also provided with a gripper groove (25); the gripper groove (25) is located on both sides of the part to be riveted (6).

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