Circuit board riveting tool

Abstract

The application discloses a circuit board riveting tool, and relates to the technical field of circuit board processing, which comprises a lower die plate and an upper die plate arranged above the lower die plate, wherein the upper die plate is provided with a driving element for driving the upper die plate to move up and down; the top surface of the lower die plate is provided with a plurality of placing rods, the placing rods are provided with arc-shaped circuit boards, the top surface of the placing rods is provided with placing holes, and the placing holes are provided with hollow rivets; the bottom surface of the upper die plate is provided with a plurality of rivet pressing rods corresponding to the hollow rivets, and the rivet pressing rods are provided with rivet pressing plates; the rivet pressing plates are provided with pressure expansion rods, and the diameters of the pressure expansion rods gradually decrease from top to bottom; the pressure expansion rods with gradually decreasing diameters can make the hollow rivets gradually and uniformly deform from the top in the riveting process, reduce the situation that the local pressure is too large, effectively reduce the risk of deformation or even breakage of the hollow rivets, and thus guarantee the mechanical strength of the riveting points and the stability of electrical connection.

Description

Technical Field

[0001] This application relates to the field of circuit board processing technology, and in particular to a circuit board riveting fixture. Background Technology

[0002] In modern electronics manufacturing, circuit boards, as the carriers of electronic components, directly determine the performance and lifespan of electronic products through the reliability of their connection processes. Circuit board crimping is a key technology for achieving electrical connections and mechanical fixation. As electronic products move towards miniaturization and integration, higher demands are placed on the precision, stability, and efficiency of circuit board crimping processes, driving continuous technological innovation.

[0003] Currently, hollow rivet riveting is one of the mainstream technologies for circuit board riveting. This technology applies pressure to the hollow rivet using a special riveting fixture, causing it to undergo plastic deformation after penetrating the circuit board and the components to be connected, thus forming a strong mechanical and electrical connection.

[0004] Regarding the aforementioned technologies, the inventors believe that during the riveting process, direct pressing by the riveting head can easily lead to problems such as deformation or even breakage of the rivet. Once the hollow rivet is deformed, it will not only reduce the mechanical strength of the riveting point and cause loosening of the connection, but also damage the stability of the electrical connection, resulting in increased contact resistance, abnormal signal transmission, and other faults. Utility Model Content

[0005] The purpose of this application is to provide a circuit board riveting fixture to improve the problem that the riveting head directly pressing the rivet during the riveting process can easily cause the rivet to deform or even break.

[0006] This application provides a riveting fixture for circuit boards, which adopts the following technical solution:

[0007] A circuit board riveting fixture includes a lower template and an upper template disposed above the lower template. The upper template is provided with a driving component to drive the upper template to move up and down. The top surface of the lower template is provided with a plurality of arc-shaped placement rods, on which arc-shaped circuit boards are placed. The top surface of the placement rods is provided with placement holes corresponding to the riveting holes on the arc-shaped circuit boards. Hollow rivets are placed in the placement holes and pass through the riveting holes. The bottom surface of the upper template is provided with a plurality of riveting rods corresponding to the hollow rivets. The end of the riveting rod away from the upper template is provided with a riveting plate. The riveting plate is provided with a spreading rod, the diameter of which gradually decreases from top to bottom.

[0008] By adopting the above technical solution, the placement rods with an arc-shaped distribution on the top surface of the lower template are adapted to the shape of the arc-shaped circuit board, ensuring that the circuit board is accurately positioned during placement and providing a stable foundation for subsequent riveting; the pressure expansion rods with gradually decreasing diameters enable the hollow rivet to be gradually and evenly deformed from the top during the riveting process, reducing the situation of excessive local pressure, effectively reducing the risk of hollow rivet deformation or even breakage, and thus ensuring the mechanical strength and electrical connection stability of the riveting point.

[0009] Optionally, the lower template is provided with a plurality of guide rods, and the upper template is provided with guide holes for the guide rods to pass through.

[0010] By adopting the above technical solution, during the riveting process, when the upper template moves up and down under the action of the driving component, the cooperation between the guide rod and the guide hole can strictly constrain the movement trajectory of the upper template, so that it moves smoothly in the up and down direction, reducing shaking or deviation; thus improving the accuracy of riveting.

[0011] Optionally, the guide rod is fitted with an elastic element, the two ends of which abut against the upper template and the lower template, respectively.

[0012] By adopting the above technical solution, when the riveting rod contacts the hollow rivet and applies pressure, the elastic element will be compressed, which plays a buffering role, making the riveting process more gentle and reducing the possibility of the hollow rivet deforming or breaking due to sudden pressure changes. At the same time, after the riveting is completed, when the drive component resets, the elastic element releases elastic potential energy, which helps the upper template return to the initial position and improves the working efficiency of the tooling.

[0013] Optionally, the lower template is provided with a locking post, and the arc-shaped circuit board is provided with a slot that matches the side wall of the arc-shaped circuit board.

[0014] By adopting the above technical solution, the slot and the engagement post engage and limit the circuit board when it is placed, which helps to prevent the circuit board from shifting during the riveting process, ensuring the accuracy of the riveting position and guaranteeing the quality of riveting.

[0015] Optionally, the lower template is provided with a plurality of inner limiting rods distributed in an arc shape, and the inner limiting rods are in contact with the inner sidewall of the arc-shaped circuit board.

[0016] By adopting the above technical solution, several arc-shaped inner limiting rods are attached to the inner wall of the arc-shaped circuit board, further restricting the movement of the circuit board in the horizontal direction, thereby improving the stability and reliability of riveting.

[0017] Optionally, the lower template is provided with an outer limiting rod, which is in contact with the outer side wall of the arc-shaped circuit board.

[0018] By adopting the above technical solution, the outer limiting rod fits against the outer wall of the arc-shaped circuit board, and together with the inner limiting rod and the locking post, it forms a multi-directional positioning and limiting of the circuit board, enhancing the fixing effect of the circuit board in the tooling.

[0019] Optionally, the lower template is provided with a balance column that fits against the bottom surface of the arc-shaped circuit board at the end of the arc-shaped circuit board away from the locking column to maintain the stable placement of the arc-shaped circuit board.

[0020] By adopting the above technical solution, the balance column fits into the bottom surface of the arc-shaped circuit board, which can effectively support the circuit board and maintain its stable placement in the horizontal direction. This reduces the deformation of hollow rivets caused by uneven force, and helps to improve the overall riveting quality and reliability of the circuit board.

[0021] Optionally, a limiting plate is provided on the top surface of the balance column, and one side of the limiting plate is in contact with the end face of the arc-shaped circuit board.

[0022] By adopting the above technical solution, the limiting plate and the end face of the arc-shaped circuit board are attached to each other to achieve precise positioning, which helps to quickly position the arc-shaped circuit board and improves the positioning accuracy.

[0023] Optionally, a transition arc surface is provided at the connection between the pressure riveting plate and the pressure expansion rod.

[0024] By adopting the above technical solution, during the process of the expansion rod applying pressure to the hollow rivet to deform it, the transition arc surface makes the pressure transmission smoother, reducing the occurrence of stress abrupt changes at the connection; it helps to protect the hollow rivet, reduce the risk of deformation or breakage due to stress concentration, improve the integrity and reliability of the hollow rivet during the riveting process, and thus ensure the quality and performance of the riveting point.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The placement rods on the top surface of the lower template are distributed in an arc shape to fit the shape of the arc-shaped circuit board, ensuring that the circuit board is accurately positioned during placement and providing a stable foundation for subsequent riveting; the pressure expansion rods with gradually decreasing diameter allow the hollow rivet to be deformed gradually and evenly from the top during the riveting process, reducing the situation of excessive local pressure, effectively reducing the risk of deformation or even breakage of the hollow rivet, and thus ensuring the mechanical strength and electrical connection stability of the riveting point;

[0027] 2. The outer limiting rod fits against the outer wall of the arc-shaped circuit board, and together with the inner limiting rod and the locking post, it forms a multi-directional positioning and limiting of the circuit board, enhancing the fixing effect of the circuit board in the tooling;

[0028] 3. During the process of the expansion rod applying pressure to the hollow rivet to deform it, the transition arc surface makes the pressure transmission smoother, reducing the occurrence of stress abrupt changes at the connection; it helps to protect the hollow rivet, reduce the risk of deformation or breakage due to stress concentration, improve the integrity and reliability of the hollow rivet during the riveting process, and thus ensure the quality and performance of the riveting joint. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the main structure of the circuit board riveting fixture;

[0030] Figure 2 This is a schematic diagram illustrating the rod placement structure in the embodiment;

[0031] Figure 3 This is a schematic diagram illustrating the structure of the rivet rod in the embodiment;

[0032] Figure 4 yes Figure 3 An enlarged schematic diagram of the structure at point A in the middle.

[0033] In the diagram, 1. Lower template; 2. Upper template; 21. Driving component; 22. Guide hole; 3. Placement rod; 31. Placement hole; 4. Arc-shaped circuit board; 41. Riveting hole; 42. Hollow rivet; 5. Pressing rod; 51. Pressing plate; 52. Pressing expansion rod; 53. Transition arc surface; 6. Guide rod; 61. Elastic component; 7. Engaging post; 71. Slot; 8. Inner limiting rod; 81. Outer limiting rod; 9. Balance post; 91. Limiting plate. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 This application will be described in further detail below.

[0035] A circuit board riveting fixture, as shown in the reference Figure 1 , Figure 2 The system includes a lower template 1 and an upper template 2 positioned above the lower template 1, which move relative to each other via a guiding mechanism. Specifically, the upper template 2 is equipped with a driving component 21, such as a cylinder or hydraulic cylinder, which is fixed to an external support by bolts. The output end of the driving component 21 is welded to the top of the upper template 2, and the driving component 21 can drive the upper template 2 to move up and down. The lower template 1 is vertically fixedly connected with several guide rods 6, preferably two in this embodiment. The guide rods 6 are fixed to the lower template 1 by welding. The upper template 2 is provided with guide holes 22 for the guide rods 6 to pass through at corresponding positions. The guide rods 6 are fitted with elastic elements 61, such as compression springs. The elastic elements 61 abut against the upper template 2 through retaining rings and are welded to the lower template 1.

[0036] Reference Figure 1 , Figure 2The top surface of the lower template 1 is provided with several arc-shaped placement rods 3. The number of placement rods 3 is determined according to the number of hollow rivets 42. The placement rods 3 are cylindrical metal rods, which are fixed to the lower template 1 by threaded connection. Their function is to support the arc-shaped circuit board 4. The arc-shaped circuit board 4 is placed on the placement rods 3, and the arc-shaped circuit board 4 is the carrier of electronic components. The top surface of the placement rods 3 is provided with placement holes 31 corresponding to the riveting holes 41 on the arc-shaped circuit board 4. The diameter of the placement holes 31 is slightly larger than the outer diameter of the hollow rivets 42. The hollow rivets 42 are placed in the placement holes 31 and pass through the riveting holes 41.

[0037] Reference Figure 1 , Figure 2 To accurately position the arc-shaped circuit board 4, the lower template 1 is provided with a locking post 7, which is welded and fixed to the lower template 1. The arc-shaped circuit board 4 is provided with a slot 71 that matches the locking post 7. At the same time, the lower template 1 is fixedly connected with several arc-shaped inner limiting rods 8 by bolts. In this embodiment, three are preferred, but more are possible. The inner limiting rods 8 are in contact with the inner sidewall of the arc-shaped circuit board 4. In addition, the lower template 1 is also fixed with an outer limiting rod 81 by welding. The outer limiting rod 81 is in contact with the outer sidewall of the arc-shaped circuit board 4. The inner limiting rods 8 and the outer limiting rod 81 together restrict the movement of the arc-shaped circuit board 4.

[0038] Reference Figure 1 , Figure 2 The lower template 1 is located at the end of the arc-shaped circuit board 4 away from the locking column 7 and is fixedly connected to a balance column 9 that is in contact with the bottom surface of the arc-shaped circuit board 4 by bolts to maintain the stable placement of the arc-shaped circuit board 4. A limit plate 91 is welded to the top surface of the balance column 9, and one side of the limit plate 91 is in contact with the end face of the arc-shaped circuit board 4.

[0039] Reference Figure 3 , Figure 4 The bottom surface of the upper template 2 is provided with several rivet rods 5 corresponding to the hollow rivets 42, and the rivet rods 5 are welded and fixed to the upper template 2. The end of the rivet rod 5 away from the upper template 2 is fixedly connected to a rivet plate 51; a pressure spreading rod 52 is vertically welded to the rivet plate 51, and the diameter of the pressure spreading rod 52 gradually decreases from top to bottom; a transition arc surface 53 is provided at the connection between the rivet plate 51 and the pressure spreading rod 52.

[0040] The implementation principle of this application embodiment is as follows:

[0041] In actual use, firstly, the hollow rivets 42 are placed one by one into the placement holes 31, and the arc-shaped circuit board 4 is placed on the placement rod 3. Under the joint limitation of the locking post 7, the inner limit rod 8 and the outer limit rod 81, the circuit board is precisely positioned on the lower template 1, and its riveting hole 41 corresponds one by one with the placement hole 31 on the placement rod 3.

[0042] Next, the drive unit 21 is activated, and the upper template 2 moves downward along the guide rod 6. When the pressing plate 51 moves downward with the upper template 2 and contacts the hollow rivet 42, the pressing plate 51 and the expansion rod 52 begin to apply pressure to the hollow rivet 42. Due to the tapered structure of the expansion rod 52, during the contact with the hollow rivet 42, the pressure is gradually and evenly transmitted from the top to the bottom of the hollow rivet 42, allowing the hollow rivet 42 to be evenly stressed and undergo plastic deformation. At the same time, the transition arc surface 53 at the connection between the riveting plate and the expansion rod helps to reduce stress concentration.

[0043] As the upper template 2 continues to move downwards, the hollow rivet 42, under the action of the expansion rod 52, expands outwards and tightly fits against the riveting hole 41 wall of the circuit board, forming a strong mechanical and electrical connection. After riveting is complete, the drive component 21 stops outputting power and begins to reset. At this time, the compressed elastic component 61 releases its elastic potential energy, pushing the upper template 2 upwards along the guide rod 6 until it returns to its initial position. Finally, the operator can remove the riveted arc-shaped circuit board 4 from the lower template 1 for subsequent assembly processes; this helps to improve the problem of deformation or even breakage of the hollow rivet 42 under the direct pressure of the riveting head during the riveting process.

[0044] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A circuit board riveting fixture, comprising a lower template (1) and an upper template (2) disposed above the lower template (1), wherein the upper template (2) is provided with a driving member (21) to drive the upper template (2) to move up and down; characterized in that: The lower template (1) has several arc-shaped placement rods (3) on its top surface. An arc-shaped circuit board (4) is placed on the placement rods (3). The top surface of the placement rods (3) is provided with placement holes (31) corresponding to the riveting holes (41) on the arc-shaped circuit board (4). Hollow rivets (42) are placed in the placement holes (31) and pass through the riveting holes (41). The bottom surface of the upper template (2) is provided with several rivet pressing rods (5) corresponding to the hollow rivets (42). A rivet pressing plate (51) is provided at the end of the rivet pressing rod (5) away from the upper template (2). The rivet pressing plate (51) is provided with a pressure spreading rod (52), and the diameter of the pressure spreading rod (52) gradually decreases from top to bottom.

2. The circuit board riveting fixture according to claim 1, characterized in that: The lower template (1) is provided with a plurality of guide rods (6), and the upper template (2) is provided with guide holes (22) for the guide rods (6) to pass through.

3. The circuit board riveting fixture according to claim 2, characterized in that: The guide rod (6) is fitted with an elastic element (61), and the two ends of the elastic element (61) abut against the upper template (2) and the lower template (1) respectively.

4. The circuit board riveting fixture according to claim 2, characterized in that: The lower template (1) is provided with a locking post (7), and the arc-shaped circuit board (4) is provided with a slot (71) that is adapted to the side wall of the arc-shaped circuit board (4).

5. A circuit board riveting fixture according to claim 4, characterized in that: The lower template (1) is provided with a number of inner limiting rods (8) arranged in an arc shape, and the inner limiting rods (8) are in contact with the inner sidewall of the arc-shaped circuit board (4).

6. A circuit board riveting fixture according to claim 5, characterized in that: The lower template (1) is provided with an outer limiting rod (81), which is in contact with the outer side wall of the arc-shaped circuit board (4).

7. A circuit board riveting fixture according to claim 6, characterized in that: The lower template (1) is provided with a balance column (9) that fits against the bottom surface of the arc circuit board (4) at the end of the arc circuit board (4) away from the locking column (7) to maintain the stable placement of the arc circuit board (4).

8. A circuit board riveting fixture according to claim 7, characterized in that: The top surface of the balance column (9) is provided with a limiting plate (91), and one side of the limiting plate (91) is in contact with the end face of the arc-shaped circuit board (4).

9. A circuit board riveting fixture according to claim 1, characterized in that: A transition arc surface (53) is provided at the connection between the pressure riveting plate (51) and the pressure expansion rod (52).

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