High-toughness pressing rivet bolt forming process

Abstract

A high-toughness pressing rivet bolt forming process comprises the following steps that S10, a pressing rivet bolt blank is placed on a thread rolling plate for thread rolling operation, a thread forming area is arranged on the working face of the thread rolling plate, a groove part forming structure area is arranged on the upper portion of the thread forming area, and a tail end arc forming area is arranged on the lower portion of the thread forming area; s20, the groove forming structure area is a protruding strip, and a material filling groove is formed in the pressing rivet bolt blank in the thread rolling process; and S30, the tail end arc forming area is provided with a slope, and an arc guide end is formed on the pressing rivet bolt blank in the thread rolling process. According to the pressing rivet bolt forming process, the thread rolling integrated forming process is adopted, the groove and the tail end of the pressing rivet bolt are directly formed, conventional turning forming is replaced, the size is guaranteed through a die, and stability and production efficiency are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of bolts and their forming processes, and specifically relates to a high-strength and toughness pressure-riveted bolt forming process. Background Art

[0002] Bolts are a very common fastener used in modern industrial production. They play the role of fastening two workpieces. They have various types and functions. Compression rivet bolts, also known as compression rivet screws or compression rivet screws, are fasteners commonly used in electronic mechanical equipment, metal sheet metal industry, hardware stamping or copper, aluminum, plastic and other materials. It is a fastener that fixes the bolt and the workpiece together through compression riveting technology. In the prior art, the structure and function of compression rivet bolts are also different. Some compression rivet bolts with special structures also have different forming processes. Based on this, the present application further studies and improves the forming process of compression rivet bolts in the prior art. Summary of the invention

[0003] In view of the deficiencies in the above-mentioned prior art, the present invention provides a high-strength and toughness self-clinching bolt forming process, which adopts a thread rolling integrated forming process. The groove and the tail end on the self-clinching bolt are directly formed, replacing the conventional turning forming. The size is guaranteed by the mold, thereby improving stability and production efficiency.

[0004] The present invention is solved by the following technical solutions.

[0005] A high-strength and toughness self-clinching bolt forming process comprises the following steps: S10: placing a self-clinching bolt blank on a thread rolling plate and performing a thread rolling operation, wherein a thread forming area is provided on the working surface of the thread rolling plate, a groove forming structure area is provided on the upper part of the thread forming area, and a tail end circular arc forming area is provided on the lower part of the thread forming area; S20: the groove forming structure area is a protruding convex strip, which forms a material filling groove on the self-clinching bolt blank during the thread rolling process; S30: the tail end circular arc forming area has a slope, which forms an arc guide end on the self-clinching bolt blank during the thread rolling process.

[0006] In a preferred embodiment, the self-rivet bolt blank includes a bolt head and a bolt rod, and the surface of the bolt rod forms threads during the thread rolling process; the outer end of the bolt rod forms an arc guide end during the thread rolling process, which is formed in one step and has a simple process.

[0007] In a preferred embodiment, an anti-rotation protrusion is provided on the surface of the bolt head facing the bolt rod, which can be smoothly pressed into the material during riveting to prevent rotation.

[0008] In a preferred embodiment, the anti-rotation protrusions are a plurality of protrusions evenly distributed around the circumference, and the anti-rotation effect is good.

[0009] In a preferred embodiment, an annular groove is provided between the bolt head and the bolt rod on the self-clinching bolt blank, and during the thread rolling process, the material filling groove is formed in the area between the annular groove and the bolt head, and the material filling groove and the annular groove are separated by a spacer ring, so that the overall structure is compact and highly functional.

[0010] In a preferred embodiment, the ratio of the depth a of the material filling groove to the depth b of the annular groove is 1.98-2.02; the ratio of the depth a of the material filling groove to its width c is 1.1-1.2, with high structural strength and good material storage function.

[0011] In a preferred embodiment, the ratio of the width c of the material filling groove to the width d of the spacer ring is 2-2.2, and the structural strength is high.

[0012] In a preferred embodiment, the inner wall of the annular groove facing the bolt rod is a sloped inner wall to facilitate the entry of materials.

[0013] Compared with the prior art, the present invention has the following beneficial effects: it provides a high-strength and toughness self-clinching bolt forming process, adopts a thread rolling integrated forming process, the groove and the tail end on the self-clinching bolt are directly formed, replacing the conventional turning forming, the size is guaranteed by the mold, and the stability and production efficiency are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A three-dimensional image of a pressure rivet bolt in the present invention Figure 1 .

[0015] Figure 2 A three-dimensional image of a pressure rivet bolt in the present invention Figure 2 .

[0016] Figure 3 It is a front view of a self-clinching bolt in the present invention.

[0017] Figure 4 It is a cross-sectional view of a self-clinching bolt in the present invention.

[0018] Figure 5 for Figure 4 Magnified view of area A.

[0019] Figure 6 for Figure 5 A magnified view of a local area.

[0020] Figure 7 It is a three-dimensional diagram of the thread rolling plate in the present invention. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] In the following embodiments, the same or similar reference numerals throughout represent the same or similar components or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] See also Figures 1 to 7 A high-strength and toughness self-clinching bolt forming process involved in the present application includes the following steps: S10: placing the self-clinching bolt blank on a thread rolling plate 6 for thread rolling, a thread forming area 62 is provided on the working surface of the thread rolling plate 6, a groove forming structure area 61 is provided on the upper part of the thread forming area 62, and a tail end arc forming area 63 is provided on the lower part of the thread forming area 62; S20: the groove forming structure area 61 is a protruding convex strip, which forms a material filling groove 23 on the self-clinching bolt blank during the thread rolling process; S30: the tail end arc forming area 63 has a slope, which forms an arc guide end 13 on the self-clinching bolt blank during the thread rolling process.

[0024] Specifically, in the present application, the self-riveting bolt blank includes a bolt head 2 and a bolt rod 1, and the surface of the bolt rod 1 forms threads during the thread rolling process; the outer end of the bolt rod 1 forms an arc guide end 13 during the thread rolling process, which is formed in one step and has a simple process.

[0025] Furthermore, the surface of the bolt head 2 facing the bolt rod 1 is provided with an anti-rotation protrusion 21, which can be smoothly pressed into the material during riveting to prevent rotation. The anti-rotation protrusion 21 is a plurality of protrusions evenly distributed around the circumference, and has a good anti-rotation effect.

[0026] In the present application, an annular groove 24 is provided between the bolt head 2 and the bolt rod 1 on the self-clinching bolt blank. During the thread rolling process, the material filling groove 23 is formed in the area between the annular groove 24 and the bolt head 2, and the material filling groove 23 and the annular groove 24 are separated by a spacer ring 234, and the overall structure is compact and highly functional. Furthermore, the ratio of the depth a of the material filling groove 23 to the depth b of the annular groove 24 is 1.98~2.02; the ratio of the depth a of the material filling groove 23 to its width c is 1.1~1.2, the structural strength is high, and the material storage function is good. The ratio of the width c of the material filling groove 23 to the width d of the spacer ring 234 is 2~2.2, and the structural strength is high.

[0027] In addition, in the present application, the inner wall of the annular groove 24 facing the bolt rod 1 is a sloped inner wall 242 to facilitate the entry of materials.

[0028] It can be seen from the above description that the present invention provides a high-strength and toughness self-clinching bolt forming process, which adopts a thread rolling integrated forming process. The groove and the tail end on the self-clinching bolt are directly formed, replacing the conventional turning forming. The size is guaranteed by the mold, which improves stability and production efficiency.

[0029] In addition, the high-strength and toughness self-riveted bolts produced by the molding process in the present application also have the following advantages: (1) an anti-rotation protrusion is provided, which can be smoothly pressed into the material during self-riveting to play an anti-rotation role; (2) a material filling groove is provided, which can allow the material to flow into the groove during self-riveting to improve the bonding force; (3) an arc guide end is provided to play a guiding role when assembling the nut.

[0030] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention shall be based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field shall fall within the protection scope of the present invention.

Claims

1. A high-strength and toughness pressure rivet bolt forming process, characterized in that: The following steps are involved: S10: placing the self-clinching bolt blank on a thread rolling plate (6) to perform a thread rolling operation, wherein a thread forming area (62) is provided on a working surface of the thread rolling plate (6), a groove forming structure area (61) is provided on the upper part of the thread forming area (62), and a tail end arc forming area (63) is provided on the lower part of the thread forming area (62); S20: the groove forming structure area (61) is a protruding convex strip, which forms a material filling groove (23) on the rivet bolt blank during the thread rolling process; S30: The tail end circular arc forming area (63) has a slope, which forms a circular arc guide end (13) on the rivet bolt blank during the thread rolling process.

2. A high-strength and toughness pressure rivet bolt forming process according to claim 1, characterized in that: The self-clinching bolt blank comprises a bolt head (2) and a bolt shank (1); a surface of the bolt shank (1) forms threads during a thread rolling process; and an outer end of the bolt shank (1) forms an arc guide end (13) during a thread rolling process.

3. A high-strength and toughness self-clinching bolt forming process according to claim 2, characterized in that: An anti-rotation protrusion (21) is provided on the surface of the bolt head (2) facing the bolt rod (1).

4. A high-strength and toughness self-clinching bolt forming process according to claim 3, characterized in that: The anti-rotation protrusions (21) are a plurality of protrusions evenly distributed around the circumference.

5. A high-strength and toughness pressure rivet bolt forming process according to claim 2, characterized in that: An annular groove (24) is provided between the bolt head (2) and the bolt rod (1) on the self-clinching bolt blank, and during the thread rolling process, the material filling groove (23) is formed in the area between the annular groove (24) and the bolt head (2), and the material filling groove (23) is separated from the annular groove (24) by a spacer ring (234).

6. A high-strength and toughness self-clinching bolt forming process according to claim 5, characterized in that: The ratio of the depth a of the material filling groove (23) to the depth b of the annular groove (24) is 1.98-2.02; and the ratio of the depth a of the material filling groove (23) to its width c is 1.1-1.

2.

7. A high-strength and toughness self-clinching bolt forming process according to claim 6, characterized in that: The ratio of the width c of the material filling groove (23) to the width d of the spacer ring (234) is 2-2.

2.

8. A high-strength and toughness self-clinching bolt forming process according to any one of claims 5 to 7, characterized in that: The inner wall of the annular groove (24) facing the bolt rod (1) is a sloped inner wall (242).

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