Riveting nut expansion riveting jig

Abstract

The utility model discloses a riveting nut expansion riveting jig which comprises a main body A and a main body B. The main body A comprises a connecting piece, a connecting portion and an end portion, one end of the connecting piece is connected with the end portion through the connecting portion, and the other end of the connecting piece is connected with the main body B. The section of the upsetting area of the jig is arc-shaped, the upsetting area is tangent to the riveting opening position, the part without inner teeth of the nut is always subjected to force with the size and the direction continuously changing gradually in the upsetting and bending process, the phenomenon of nut riveting crack is basically eliminated through the flexible acting force, and a looseness stopping point of the riveted nut is inserted into base metal deeply and is not prone to looseness.

Description

Technical Field

[0001] This utility model belongs to the technical field of riveting fixtures, and particularly relates to a riveting nut riveting fixture. Background Technology

[0002] Currently, existing rivet nuts are mainly used as fasteners in sheet metal, thin plates, chassis, and cabinets. The conventional method is manual riveting, such as... Figure 4 As shown, pre-drilled holes are made in the base material, and the riveting nut is placed into the pre-drilled holes. Three types of jigs with tapers of 90°, 120°, and 180° are used to sequentially expand the threadless portion of the nut from the inside out until the nut is tightly riveted to the base material. In existing jig structures, when riveting nuts, three types of jigs with tapers of 90°, 120°, and 180° are used to sequentially expand the threadless portion of the nut from the inside out. The threadless portion of the nut is simultaneously subjected to axial and radial forces, resulting in stretching, expansion, and flattening. During this process, the magnitude and direction of the forces exerted on the threadless portion by the three different taper jigs are abrupt. The rigid force easily leads to cracking of the nut due to expansion. Furthermore, the shallow insertion point of the riveted nut into the base material makes it prone to loosening, ultimately leading to nut scrap and rework.

[0003] Patent document CN209139740U discloses a nut riveting fixture, comprising: an upper riveting module, one end of which is mounted on the upper die base of the riveting machine, and the other end of which is pointed for riveting nuts; a protruding blocking part on the upper riveting module; a positioning post, which is a hollow elastic post fitted around the upper riveting module, with one end of the positioning post contacting the blocking part, and the length of the positioning post being greater than the length from the blocking part to the other end of the upper riveting module; and a lower riveting module, one end of which is mounted on the lower die base of the riveting machine, and the other end of which is used to place the nut.

[0004] Patent document CN203304478U discloses a nut expansion and tightening fixture, including an upper die for expansion and tightening and a lower die for nut positioning. The upper die and the lower die are coaxially mounted on a nailing machine. The upper die includes a body and an expansion protrusion, and the lower die includes a nut positioning groove.

[0005] The aforementioned patent does not have a structure similar to the upsetting zone, which makes it difficult to eliminate the phenomenon of nut cracking. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a riveting nut expansion fixture.

[0007] This utility model is achieved through the following technical solution.

[0008] This utility model provides a riveting nut expansion fixture, including a main body A and a main body B. The main body A includes a connector, a connecting part, and an end. One end of the connector is connected to the connecting part and the end, and the other end of the connector is connected to the main body B.

[0009] Preferably, the main body B is cylindrical, with a tapered portion at one end, and the connector is cylindrical with a diameter smaller than that of the main body B.

[0010] Preferably, the main body B is provided with an inclined surface and a groove. One end of the main body B is provided with an inclined surface, a groove, and a conical part from the outside to the inside. The groove is annular and surrounds the conical part.

[0011] Preferably, the angle between the inclined surface and the bottom surface of the conical part is 100-140 degrees.

[0012] Preferably, the groove has a circular arc cross-section.

[0013] Preferably, the angle of the tapered portion is 80-140 degrees, and the tapered portion is coaxially arranged with the main body B.

[0014] Preferably, the surface of the connecting part is conical, and the end of the end furthest from the connecting part is provided with a tail, the surface of which is flat or curved.

[0015] The beneficial effects of this utility model are as follows:

[0016] The upsetting area of ​​the fixture of this utility model has an arc-shaped cross section that is tangent to the rivet head. The nut without internal threads is subjected to a force that changes gradually in magnitude and direction during upsetting and bending. The flexible force basically eliminates the phenomenon of nut cracking. Furthermore, the locking point of the rivet nut is deeply inserted into the base material, making it less prone to loosening.

[0017] This utility model's fixture effectively reduces issues such as nut cracking, misalignment, and loose riveting during the riveting process, resulting in high efficiency and aesthetically pleasing results. The fixture's structure is suitable for small-batch work and conventional manual riveting, as well as for large-batch work using a riveting machine for rapid operation, achieving one-time riveting. This fixture is simple, easy to use, and convenient to carry and store. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of this utility model;

[0020] Figure 3 This is a flowchart of the riveting process for this utility model;

[0021] Figure 4 This is a flowchart of the existing technology for raising and lowering the thread;

[0022] In the figure: 1-Main body A, 11-Connector, 12-Connecting part, 13-End, 14-Tail, 2-Main body B, 21-Inclined surface, 22-Groove, 3-Conical part. Detailed Implementation

[0023] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0024] Example:

[0025] like Figures 1 to 3 As shown, a riveting nut expansion fixture includes a main body A1 and a main body B2. The main body A1 includes a connector 11, a connecting part 12, and an end 13. One end of the connector 11 is connected through the connecting part 12 and the end 13, and the other end of the connector 11 is connected to the main body B2.

[0026] The main body B2 is cylindrical, and a tapered part 3 is provided at one end of the main body B2. The connecting member 11 is cylindrical. The fixture is clamped by using a clamp to hold the connecting member 11. The diameter of the connecting member 11 is smaller than the diameter of the main body B2, which facilitates the clamping.

[0027] The main body B2 is provided with an inclined surface 21 and a groove 22. One end of the main body B2 is provided with an inclined surface 21, a groove 22 and a conical part 3 from the outside to the inside. The groove 22 is annular and surrounds the conical part 3. The groove 22 is the upsetting area of ​​this tool.

[0028] The angle between the inclined surface 21 and the bottom surface of the conical part 3 is 100-140 degrees, preferably 120 degrees.

[0029] The groove 22 has an arc-shaped cross section to allow for space between the nut and the bending point during the riveting operation, thus preventing cracking or misalignment.

[0030] The angle of the tapered portion 3 is 80-140 degrees, preferably 120 degrees, and the tapered portion 3 is coaxially arranged with the main body B2.

[0031] The surface of the connecting part 12 is conical, and the end of the end 13 away from the connecting part 12 is provided with a tail 14. The tail 14 can be a flat surface or an arc surface of STR60. When machining by hand using a tool, the arc surface of the tail 14 of STR60 facilitates manual riveting and can avoid riveting deviation when the fitter uses a hammer to strike the end 13. When machining by a riveting machine using a tool, the connecting part 12 is conical and the tail 14 is flat, which facilitates the clamping and fixing of the main body A1.

[0032] When using the fixture of this application, the main body A1 is assembled on the riveting machine, and then the tapered part 3 is made coaxial with the riveting nut to perform the riveting process.

[0033] When the jig of this application is in use, the deformation process of the part without internal teeth is: upsetting → bending → extrusion → forming, which can complete the riveting process in one step.

[0034] Using the jigs of this application and existing jigs, M3-5H, M4-5H, and M5-5H rivet nuts were riveted on steel plates. The results show that the holes of the rivet nuts are divided into two rows. The first row from top to bottom shows the riveting effect of the existing technology, and the second row shows the riveting effect of the jigs of this application. The six holes in each row are, from left to right, M3-5H, M4-5H, M5-5H, M5-5H, M4-5H, and M3-5H. The dimensions of the rivet nuts are shown in the table below.

[0035] Rivet nut dimensions D / mm M3-5H 3.5 M4-5H 5 M5-5H 6

[0036] As can be seen from the comparison, the nut riveted by the fixture of this application fits tightly with the surface of the workpiece, and the overall surface is smooth without burrs or defects.

Claims

1. A riveting nut expansion fixture, characterized in that: It includes a main body A (1) and a main body B (2). The main body A (1) includes a connector (11), a connecting part (12) and an end (13). One end of the connector (11) is connected to the connecting part (12) and the end (13), and the other end of the connector (11) is connected to the main body B (2).

2. The riveting nut expansion fixture as described in claim 1, characterized in that: The main body B(2) is cylindrical, and a tapered part (3) is provided at one end of the main body B(2). The connector (11) is cylindrical, and the diameter of the connector (11) is smaller than the diameter of the main body B(2).

3. The riveting nut expansion fixture as described in claim 2, characterized in that: The main body B (2) is provided with an inclined surface (21) and a groove (22). The inclined surface (21), the groove (22) and the conical part (3) are arranged sequentially from the outside to the inside at one end of the main body B (2). The groove (22) is annular and surrounds the conical part (3).

4. The riveting nut expansion fixture as described in claim 3, characterized in that: The angle between the inclined surface (21) and the bottom surface of the conical part (3) is 100-140 degrees.

5. The riveting nut expansion fixture as described in claim 3, characterized in that: The groove (22) has a circular arc cross-section.

6. The riveting nut expansion fixture as described in claim 3, characterized in that: The conical part (3) has an angle of 80-140 degrees and is coaxially arranged with the main body B (2).

7. The riveting nut expansion fixture as described in claim 1, characterized in that: The surface of the connecting part (12) is conical, and the end (13) away from the connecting part (12) is provided with a tail (14), the surface of the tail (14) is flat or arc-shaped.

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