Metal plate rivet-free self-piercing riveting device

Abstract

The utility model discloses a rivet-free self-piercing riveting device for metal plates, and relates to the technical field of riveting. Comprising an upper module and a lower module, the upper module is located above the lower module, and the upper module can be pressed on the upper end face of the lower module; the upper die set comprises an upper die base, a die handle, a male die fixing plate, a male die and a rubber pre-pressing block. The die handle is arranged on the upper end face of the upper die base, the male die fixing plate is arranged at the lower end of the upper die base, and a male die positioning hole is formed in the middle of the male die fixing plate. The rubber pre-pressing block is arranged at the lower end of the male die fixing plate, and the upper end of the male die is fixedly arranged in the positioning hole. The lower die set comprises a lower die base, a female die fixing plate and a female die, the female die fixing plate is arranged on the upper end face of the upper die base, a female die positioning hole is formed in the middle of the female die fixing plate, and the female die is arranged in the female die positioning hole. The technical problems that in traditional rivet-free punching and riveting, a plate is not pre-pressed, a male die and a female die directly punch the plate, the plate possibly generates tiny displacement and upwarp, and the riveting precision and quality are affected are solved.

Description

Technical Field

[0001] This utility model relates to the field of riveting technology, and in particular to a rivetless self-piercing riveting device for metal sheets. Background Technology

[0002] With the rapid development of society and industrial manufacturing technology, consumer goods such as home appliances and automobiles are becoming increasingly popular. Metal sheet materials are widely used, and the trend is towards lightweighting and new materials. To meet the needs of material joining, various joining technologies have been invented. Achieving lightweight materials while ensuring connection stability has become an important direction for the development of material joining technology. Traditional spot welding technology, due to its high cost, environmental pollution, and weldability limitations, can no longer meet the growing demand. Although spot welding technology still dominates in industrial production, with the rapid development of industrial modernization, new sheet metal joining technologies are gradually emerging. These include semi-hollow rivet riveting, solid rivet riveting, double connectors, and blind rivet connections, which are particularly suitable for cold-formed sheet metal connections, but have drawbacks such as unstable connection quality and the inability to perform non-destructive testing. For example, utility model patent CN201911141809.5 discloses a movable reverse rivetless riveting die, including a punch, a movable blank holder, and a reverse stamping die. The punch is provided with a reverse limiting boss, which can cooperate with the boss on the movable slider of the blank holder during the reverse riveting stage to restrict the upward movement of the punch. The movable blank holder includes a blank holder disc, a guide groove, and a movable slider. The movable slider is provided with a boss, which can cooperate with the reverse limiting boss on the punch during the reverse riveting stage to restrict the upward movement of the punch. The reverse stamping die includes a fixed die and a T-shaped movable die. The fixed die is provided with a stepped hole, which forms a stamping cavity similar to traditional rivetless riveting with the top of the T-shaped movable die with an annular groove. In the first riveting stage, the material flows into the cavity, the riveting joint is formed, and the downward movement of the T-shaped movable die is restricted. Using this movable reverse rivetless riveting die, reverse secondary stamping can be performed directly. However, the above solution does not pre-press the sheet metal to be riveted. The punch and die directly press the sheet metal, which may cause slight displacement and warping of the sheet metal, affecting the riveting accuracy and quality. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a rivetless self-punching riveting device for metal sheets. This device solves the technical problem that traditional rivetless punching and riveting methods do not pre-press the sheet material to be riveted, and the punch and die directly punch the sheet material, which may cause slight displacement and warping of the sheet material, affecting the riveting accuracy and quality.

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

[0005] A rivetless self-piercing riveting device for metal sheets, characterized in that: it includes an upper die assembly and a lower die assembly, the upper die assembly being located above the lower die assembly and capable of pressing against the upper end face of the lower die assembly; the upper die assembly includes an upper die base, a die shank, a punch fixing plate, a punch, and a rubber pre-pressing block; the die shank is mounted on the upper end face of the upper die base, the punch fixing plate is mounted on the lower end of the upper die base, and a punch positioning hole is provided in the middle of the punch fixing plate; the rubber pre-pressing block is mounted on the lower end of the punch fixing plate, and a clearance hole corresponding to the punch positioning hole is provided on the rubber pre-pressing block, the upper end of the punch is fixedly mounted in the positioning hole, and the lower end of the punch is located in the clearance hole; the lower die assembly includes a lower die base, a die fixing plate, and a die, the die fixing plate is mounted on the upper end face of the upper die base, the die fixing plate is provided with a die positioning hole in the middle of the die, and the die is mounted in the die positioning hole.

[0006] Furthermore, the upper module also includes a backing plate, and the punch fixing plate is fixedly connected to the lower end face of the upper mold base through the backing plate.

[0007] Furthermore, the lower module also includes a sliding guide post, and the upper module is provided with a sliding guide sleeve, which is fitted onto the sliding guide post.

[0008] Furthermore, the lower mold base is provided with guide post mounting holes, and the lower end of the sliding guide post is inserted into the guide post mounting holes and is interference-fitted with the guide post mounting holes.

[0009] Furthermore, the upper mold base is provided with a sliding sleeve mounting hole, and the upper end of the sliding guide sleeve is inserted into the sliding sleeve mounting hole and is interference-fitted with the sliding sleeve mounting hole.

[0010] Furthermore, the rubber pre-compression block is made of polyurethane rubber.

[0011] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows:

[0012] 1. In the application of this utility model for riveting, the sheet metal is positioned between the upper and lower dies, and the die shank connects the mold and the press, causing the upper die to move downwards. When the punch and die approach each other, they punch the sheet metal. The die accommodates the sheet metal and guides it to undergo plastic deformation, forming the connection point. Before the punch contacts the sheet metal, a rubber pre-pressing block applies pressure to the sheet metal, fixing it in place and preventing displacement or warping during the punching process. This solves the technical problem of traditional rivetless riveting where the sheet metal to be riveted is not pre-pressed, and the punch and die directly punch the sheet metal, potentially causing slight displacement and warping, affecting riveting accuracy and quality.

[0013] 2. The pad of this utility model is located between the upper template and the punch fixing plate. It is used to reduce and bear the load generated by stamping, prevent the die holder from being damaged by too much pressure, and improve reliability. At the same time, it can facilitate the adjustment of the vertical position of the punch, and facilitate the use of rivetless riveting of plates of different thicknesses.

[0014] 3. This utility model guides the relative movement of the upper and lower mold bases through the cooperation of sliding guide pillars and sliding guide sleeves, ensuring the accuracy and stability of the mold. The sliding guide pillars and the lower mold base are fitted with an interference fit, and the upper mold base and the sliding guide sleeve are fitted with an interference fit, ensuring that the axes of the sliding guide pillars and the sliding guide sleeves are aligned during assembly, reducing the impact of riveting quality and even damage to the mold, and improving the mold life. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the vertical and horizontal sections of this utility model;

[0016] Figure 2 This is a longitudinal sectional view of the present invention.

[0017] In the attached diagram, 1-upper mold assembly, 2-lower mold assembly, 11-upper mold base, 12-mold handle, 13-punch fixing plate, 14-punch, 15-rubber pre-compression block, 16-pad, 17-sliding guide sleeve, 18-first bolt, 19-second bolt, 21-lower mold base, and, 22-concave mold fixing plate, 23-concave mold, 24-sliding guide post, 25-third bolt. Detailed Implementation

[0018] The specific implementation of the utility model will be further described below with reference to the accompanying drawings.

[0019] In the description of this utility model, it should be understood that the terms "center", "length", "width", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] Please see Figure 1 and Figure 2 A rivetless self-piercing riveting device for metal sheets, characterized in that it includes an upper die assembly 1 and a lower die assembly 2, the upper die assembly 1 being located above the lower die assembly 2 and capable of pressing against the upper end face of the lower die assembly 2; the upper die assembly 1 includes an upper die base 11, a die shank 12, a punch fixing plate 13, a punch 14, and a rubber pre-pressing block 15; the die shank 12 is mounted on the upper end face of the upper die base 11, the punch fixing plate 13 is mounted on the lower end of the upper die base 11, and a positioning hole for the punch 14 is provided in the middle of the punch fixing plate 13. A rubber pre-compression block 15 is installed at the lower end of the punch fixing plate 13, and a clearance hole corresponding to the positioning hole of the punch 14 is provided on the rubber pre-compression block 15. The upper end of the punch 14 is fixedly installed in the positioning hole, and the lower end of the punch 14 is located in the clearance hole. The lower mold assembly 2 includes a lower mold base, a die fixing plate 22, and a die 23. The die fixing plate 22 is installed on the upper end face of the upper mold base 11, and a positioning hole for the die 23 is provided in the middle of the die fixing plate 22. The die 23 is installed in the positioning hole of the die 23. Specifically, the rubber pre-compression block 15 is fixed by two M8 second bolts 19, the punch fixing plate 13 and the punch 14 are fixed by four M10 first bolts, and the die fixing plate 22 and the die 23 are fixed on the lower mold base by four M10 third bolts 25. When using the stamping and riveting process, the sheet metal is positioned correctly between the upper die group 1 and the lower die group 2. The die and the press are connected by the die handle 12, which drives the upper die group 1 to move downward. When the punch 14 and the die 23 approach each other, the sheet metal is stamped. The die 23 is used to accommodate the sheet metal and guide it to undergo plastic deformation to form a connection point. Before the punch 14 contacts the sheet metal, the rubber pre-pressing block 15 applies pressure to the sheet metal to fix it and prevent it from shifting or warping during the stamping process.

[0023] In this embodiment, the upper module 1 also includes a backing plate 16, and the punch fixing plate 13 is fixedly connected to the lower end face of the upper die base 11 through the backing plate 16. The backing plate 16 is located between the upper die plate and the punch fixing plate 13, and is used to reduce and bear the load generated by stamping, prevent the die base from being damaged by excessive pressure, and improve reliability; at the same time, it can facilitate the adjustment of the vertical position of the punch 14, and facilitate the use of rivetless riveting of plates of different thicknesses. Multiple backing plates 16 of different thicknesses can be provided and directly replaced.

[0024] In this embodiment, the lower module 2 further includes a sliding guide post 24, and the upper module 1 is provided with a sliding guide sleeve 17, which is fitted onto the sliding guide post 24. Specifically, the lower mold base is provided with a guide post mounting hole, and the lower end of the sliding guide post 24 is inserted into the guide post mounting hole and has an interference fit with the guide post mounting hole. The upper mold base 11 is provided with a sliding sleeve mounting hole, and the upper end of the sliding guide sleeve 17 is inserted into the sliding sleeve mounting hole and has an interference fit with the sliding sleeve mounting hole. The lower end of the sliding guide post 24 and the guide post mounting hole have an H7 / r6 interference fit, and the upper end of the sliding guide sleeve 17 and the sliding sleeve mounting hole have an H7 / r6 interference fit.

[0025] In this embodiment, the rubber pre-compression block 15 is made of polyurethane rubber.

[0026] The above description is a detailed description of the preferred embodiments of the present utility model. However, the embodiments are not intended to limit the scope of the patent application of the present utility model. All equivalent changes or modifications made under the technical spirit of the present utility model should fall within the patent scope covered by the present utility model.

Claims

1. A self-piercing rivet-free clinching apparatus for sheet metal, characterized by: The device includes an upper mold assembly and a lower mold assembly. The upper mold assembly is located above the lower mold assembly and can press against the upper surface of the lower mold assembly. The upper mold assembly includes an upper mold base, a mold shank, a punch fixing plate, a punch, and a rubber pre-pressing block. The mold shank is installed on the upper surface of the upper mold base, and the punch fixing plate is installed at the lower end of the upper mold base. A punch positioning hole is provided in the middle of the punch fixing plate. The rubber pre-pressing block is installed at the lower end of the punch fixing plate, and a clearance hole corresponding to the punch positioning hole is provided on the rubber pre-pressing block. The upper end of the punch is fixedly installed in the positioning hole, and the lower end of the punch is located in the clearance hole. The lower mold assembly includes a lower mold base, a die fixing plate, and a die. The die fixing plate is installed on the upper surface of the upper mold base, and a die positioning hole is provided in the middle of the die fixing plate. The die is installed in the die positioning hole.

2. A self-piercing rivet-free clinching apparatus for sheet metal according to claim 1, characterized in that: The upper module also includes a pad, and the punch fixing plate is fixedly connected to the lower end face of the upper mold base through the pad.

3. A self-piercing rivet-free clinching apparatus for sheet metal according to claim 1, characterized in that: The lower module further includes a sliding guide post, and the upper module is provided with a sliding guide sleeve, which is fitted onto the sliding guide post.

4. A self-piercing rivet-free clinching apparatus for sheet metal according to claim 3, characterized in that: The lower mold base is provided with guide post mounting holes, and the lower end of the sliding guide post is inserted into the guide post mounting holes and is interference-fitted with the guide post mounting holes.

5. A self-piercing rivet-free clinching apparatus for sheet metal according to claim 3, characterized in that: The upper mold base is provided with a sliding sleeve mounting hole, and the upper end of the sliding guide sleeve is inserted into the sliding sleeve mounting hole and is interference-fitted with the sliding sleeve mounting hole.

6. A self-piercing rivet-free clinching apparatus for sheet metal according to claim 1, characterized in that: The rubber pre-compression block is made of polyurethane rubber.

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