Puncturing flanging riveting bolt and riveting method thereof

Abstract

The invention provides a puncture flanging riveting bolt. The puncture flanging riveting bolt comprises a bolt body. External threads are arranged at one end of the bolt body; a puncture flanging part is arranged at the other end of the bolt body; a flange is arranged between the puncture flanging part and the external thread; anti-rotation teeth are arranged at the vertical included angle between the flange and the puncture flanging part at equal intervals; a hollow puncture flanging inner hole is formed in the center of the puncture flanging part; the puncture flanging riveting bolt has the advantages of being environmentally friendly, efficient, high in strength and stable, after the puncture flanging part of the puncture flanging riveting bolt is shaped, the puncture flanging part and the flange form a double-face tightening effect on a metal plate, loosening is avoided, and the quality is more stable; the puncture flanging riveting bolt product replaces a welding nut, poison gas generated by welding is avoided, the machining process is environmentally friendly and free of pollution, the puncture flanging riveting technology is high in machining efficiency, the surface is smooth and the shape is regular after machining, and manual polishing and grinding cost does not need to be increased, so that cost is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bolts, in particular to a piercing and flanging riveting bolt and a riveting method thereof. Background Art

[0002] In the prior art, the connection between the bolt and the connecting plate is usually made by welding, threaded connection, etc. However, these connection methods have shortcomings in certain applications. For example, although the welding connection has high strength, it is easy to produce thermal deformation and residual stress during the welding process, which affects the accuracy and reliability of the connecting parts, and the welding process will produce toxic gas to pollute the environment. The threaded connection requires the threaded holes to be processed on the connecting plate in advance, which increases the processing cost and complexity.

[0003] In order to solve the above problems, people began to try to use stamping and shaping riveting technology to connect bolts and connecting plates. This technology uses stamping equipment to stamp and shape the bolts and connecting plates to form a strong connection between them. However, the existing stamping and shaping riveted bolts still have some shortcomings in structure and performance. For example, the stamping and shaping part of some bolts is not designed reasonably, resulting in insufficient connection strength and stability; other bolts have problems such as high processing difficulty and high cost. Summary of the invention

[0004] The purpose of the present invention is to provide a piercing flanging riveting bolt and a riveting method thereof, which have the advantages of environmental protection, high efficiency, high strength and stability. The piercing flanging riveting bolt product replaces the welding nut, has no toxic gas generated by welding, and the processing process is environmentally friendly and pollution-free. The piercing flanging riveting process has high processing efficiency, and the surface after processing is smooth and regular in shape, and there is no need to increase the cost of manual polishing and grinding, thereby greatly reducing the cost.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a piercing flange rivet bolt, including a bolt body; wherein: one end of the bolt body is provided with an external thread; the other end of the bolt body is provided with a piercing flange portion; a flange is provided between the piercing flange portion and the external thread; anti-rotation teeth are equally divided at the vertical angle between the flange and the piercing flange portion; a hollow piercing flange inner hole is opened in the center of the piercing flange portion; the bottom of the piercing flange inner hole directly contacts the end of the flange.

[0006] As a further improvement of the technical solution of the present invention, the thickness and diameter design dimensions between the puncture flange portion and the puncture flange inner hole are set according to the load that the outer diameter of the external thread needs to withstand.

[0007] As a further improvement of the technical solution of the present invention, it also includes a stamping die; the stamping die includes an upper die and a lower die; an upper die punch is provided at the center of the upper die; and a puncture and flanging forming groove is provided around the upper die punch.

[0008] As a further improvement of the technical solution of the present invention, a positioning hole matching the outer diameter of the external thread is provided at the center of the lower die.

[0009] As a further improvement of the technical solution of the present invention, one end where the upper die is assembled with the lower die is an upper die plane; and one end where the lower die is assembled with the upper die is a lower die plane.

[0010] As a further improvement of the technical solution of the present invention, a riveting method for a piercing flanging riveting bolt comprises the following steps:

[0011] Step S1, first fix the upper die and the lower die on the stamping equipment, and adjust the pressure and stroke;

[0012] Step S2, placing the external thread of the piercing and flanging rivet bolt into the positioning hole of the lower die, and then positioning the metal sheet and placing it on the piercing and flanging part;

[0013] Step S3, start the stamping equipment and let the upper die move downward quickly, so that the puncture flanging part instantly stretches the metal sheet under the action of impact pressure to shape the metal sheet, and at the same time, the puncture flanging part forms a puncture flanging along the angle of the upper die punch, and the materials of the puncture flanging part and the metal sheet together fill the puncture flanging forming groove and are tightly riveted into one.

[0014] The piercing flanging riveting bolt and the flanging riveting process of the present invention have the technical advantages of environmental protection, high efficiency, high strength, stability and cost reduction; the present invention has the following beneficial effects:

[0015] 1. The piercing and flanging riveting bolts replace the welding nuts, there is no toxic gas produced by welding, and the processing process is environmentally friendly and pollution-free;

[0016] 2. The instantaneous riveting processing efficiency of stamping equipment is high, and the riveting processing of automated equipment can be made more efficient;

[0017] 3. The mechanical strength of the piercing and flanging riveting bolts can be made of the corresponding materials according to the use requirements, so as to solve the quality problem of brittle cracking caused by too high welding strength of the welding nut. And the piercing and flanging riveting bolts can be riveted on different metal materials;

[0018] 4. After the piercing flange part of the piercing flange rivet bolt is shaped, it and the flange form a double-sided tightening effect on the metal plate to avoid loosening and make the quality more stable;

[0019] 5. The piercing, flanging and riveting process has high processing efficiency. The surface is smooth and regular in shape after processing, and there is no need to increase the cost of manual polishing, thus greatly reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of a piercing and flanging riveting bolt of the present invention;

[0022] Figure 2 It is a schematic diagram of the three-dimensional structure of a piercing and flanging riveting bolt and a metal plate before being assembled;

[0023] Figure 3 It is a schematic diagram of the planar structure of a piercing and flanging riveting bolt and a metal plate before being assembled;

[0024] Figure 4 It is a schematic plan view of the opening and flanging riveting (flanging riveting is formed on the back of the metal plate) according to an embodiment of the present invention;

[0025] Figure 5 It is a three-dimensional schematic diagram of the opening and flanging riveting (flanging riveting is formed on the back of the metal plate) according to an embodiment of the present invention;

[0026] Figure 6 It is a schematic plan view of the non-drilling puncture riveting (forming a flanging riveting in a metal sheet) according to an embodiment of the present invention;

[0027] Figure 7 It is a three-dimensional schematic diagram of the opening and flanging riveting (forming flanging riveting in a metal sheet) according to an embodiment of the present invention.

[0028] In the attached drawings: 100-bolt body; 1-external thread; 2-flange; 3-anti-rotation tooth; 4-puncture flanging part; 5-puncture flanging inner hole; 6-upper die; 7-puncture flanging forming groove; 8-upper die punch; 9-upper die plane; 10-puncture flanging position shaping; 11-metal sheet; 12-metal sheet shaping; 13-lower die; 14-lower die plane; 15-positioning hole. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0030] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In the present invention, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features; in addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0034] See also Figures 1 to 4 The present invention provides a technical solution: a piercing flanging rivet bolt, comprising a bolt body 100; wherein: one end of the bolt body 100 is provided with an external thread 1; the other end of the bolt body 100 is provided with a piercing flanging portion 4; a flange 2 is provided between the piercing flanging portion 4 and the external thread 1; anti-rotation teeth 3 are equally divided at the vertical angle between the flange 2 and the piercing flanging portion 4; a hollow piercing flanging inner hole 5 is opened at the center of the piercing flanging portion 4; the bottom of the piercing flanging inner hole 5 directly reaches the end of the flange 2.

[0035] Specifically, in this embodiment, the thickness and diameter design dimensions between the puncture flange portion 4 and the puncture flange inner hole 5 are set according to the load that the outer diameter of the external thread 1 needs to withstand.

[0036] Specifically, the present embodiment also includes a stamping die; the stamping die includes an upper die 6 and a lower die 13; an upper die punch 8 is provided at the center of the upper die 6; and a puncture flanging forming groove 7 is provided around the upper die punch 8.

[0037] Specifically, in this embodiment, a positioning hole 15 matching the outer diameter of the external thread 1 is provided at the center of the lower die 13 .

[0038] Specifically, in this embodiment, one end of the upper mold 6 and the lower mold 13 assembled together is the upper mold plane 9; and one end of the lower mold 13 and the upper mold 6 assembled together is the lower mold plane 14.

[0039] Example:

[0040] A piercing flange rivet bolt, the piercing flange rivet bolt is provided with an external thread 1, and anti-rotation teeth 3 are provided at the vertical angle between the flange 2 and the piercing flange part 4. The anti-rotation teeth 3 can be appropriately lengthened along the piercing flange part 4 according to the mechanical performance requirements. The center part of the piercing flange part 4 is a hollow piercing flange inner hole 5, and the bottom of the piercing flange inner hole 5 reaches the flange 2 directly.

[0041] The thickness and diameter design dimensions between the piercing flange portion 4 and the piercing flange inner hole 5 are designed according to the load that the outer diameter of the bolt thread needs to bear, so as to meet the mechanical properties during the use process after the piercing flange is riveted.

[0042] The invention discloses a process technology principle for piercing and flanging riveting of a piercing and flanging riveting bolt.

[0043] The principle of the piercing flanging riveting bolt piercing flanging riveting process technology is to use special stamping dies and equipment to utilize the metal hardness and plasticity of the piercing flanging riveting bolt to perform hole flanging riveting or hole-free piercing riveting assembly on metal sheets. It is an environmentally friendly and efficient process technology. Figure 4 and Figure 5 As shown in the figure; non-drilling piercing riveting is to form a flanged riveting in a metal sheet without a hole. Figure 6 and Figure 7 shown.

[0044] The stamping die is composed of an upper die 6 and a lower die 13. An upper die punch 8 is provided at the center of the upper die 6, and a piercing and flanging forming groove 7 is provided around the upper die punch 8 to meet the riveting requirements of different bolt sizes. A positioning hole 15 matching the outer diameter of the external thread 1 is provided at the center of the lower die 13. An upper die plane 9 and a lower die plane 14.

[0045] Process technology:

[0046] 1. First, fix the upper die 6 and the lower die 13 on the stamping equipment, and adjust the pressure and stroke.

[0047] 2. Place the external thread 1 of the piercing and flanging rivet bolt into the positioning hole 15 of the lower die 13, and then position the metal plate 11 on the piercing and flanging portion 4.

[0048] 3. Start the stamping equipment and move the upper die 6 downward quickly, so that the puncture flanging part 4 instantly stretches the metal sheet 11 under the action of the impact pressure to form a metal sheet shaping 12. At the same time, the puncture flanging part 4 forms a puncture flanging along the angle of the upper die punch 8, and the materials of the puncture flanging shaping 10 and the metal sheet shaping 12 together fill the puncture flanging forming groove 7 and are tightly riveted into one.

[0049] The thread and size design of the piercing and flanging riveting bolt of the present invention are as follows:

[0050] Thread specification:

[0051] It can be manufactured into ISO standard thread, national standard thread and American standard thread according to the needs of use.

[0052] Common national standard thread specifications: M4, M5, M6, M8, M10, M12 and other specifications.

[0053] Commonly used American standard thread specifications: 8-24UNC, 10-24UNC, 1 / 4-20UNC, 5 / 16-18UNC, 3 / 8-16UNC and other specifications.

[0054] Piercing flange rivet bolt size design:

[0055] The piercing flanging rivet bolt can be designed according to the specifications of the traditional rivet nut, and the outer diameter and length can be adjusted according to the thickness of the structural part.

[0056] The piercing flanging riveting bolt product of the present invention can be produced and manufactured using raw materials such as stainless steel 304, stainless steel 316, carbon steel, copper, aluminum alloy, etc. according to different requirements.

[0057] In summary, the piercing flanging riveting bolt and the flanging riveting process of the present invention have the technical advantages of environmental protection, high efficiency, high strength, stability and cost reduction; the present invention has the following beneficial effects:

[0058] 1. The piercing and flanging riveting bolts replace the welding nuts, there is no toxic gas produced by welding, and the processing process is environmentally friendly and pollution-free;

[0059] 2. The instantaneous riveting processing efficiency of stamping equipment is high, and the riveting processing of automated equipment can be made more efficient;

[0060] 3. The mechanical strength of the piercing and flanging riveting bolts can be made of the corresponding materials according to the use requirements, so as to solve the quality problem of brittle cracking caused by too high welding strength of the welding nut. And the piercing and flanging riveting bolts can be riveted on different metal materials;

[0061] 4. After the piercing flange part of the piercing flange rivet bolt is shaped, it and the flange form a double-sided tightening effect on the metal plate to avoid loosening and make the quality more stable;

[0062] 5. The piercing, flanging and riveting process has high processing efficiency. The surface is smooth and regular in shape after processing, and there is no need to increase the cost of manual polishing, thus greatly reducing costs.

[0063] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A piercing and flanging riveting bolt, comprising a bolt body; characterized in that: One end of the bolt body is provided with an external thread; the other end of the bolt body is provided with a puncture flange portion; a flange is provided between the puncture flange portion and the external thread; anti-rotation teeth are equally divided at the vertical angle between the flange and the puncture flange portion; a hollow puncture flange inner hole is provided at the center of the puncture flange portion; the bottom of the puncture flange inner hole directly reaches the end of the flange.

2. The piercing and flanging rivet bolt according to claim 1, characterized in that: The thickness and diameter design dimensions between the puncture flange portion and the puncture flange inner hole are set according to the load that the outer diameter of the external thread needs to withstand.

3. The piercing and flanging rivet bolt according to claim 1, characterized in that: It also includes a stamping die; the stamping die includes an upper die and a lower die; an upper die punch is provided at the center of the upper die; and a puncture and flanging forming groove is provided around the upper die punch.

4. The piercing and flanging rivet bolt according to claim 3, characterized in that: A positioning hole matching the outer diameter of the external thread is provided at the center of the lower die.

5. The piercing and flanging rivet bolt according to claim 3, characterized in that: One end of the upper die and the lower die being assembled is an upper die plane; and one end of the lower die and the upper die being assembled is a lower die plane.

6. A riveting method for a piercing flanged riveting bolt, characterized in that: The following steps are involved: Step S1, first fix the upper die and the lower die on the stamping equipment, and adjust the pressure and stroke; Step S2, placing the external thread of the piercing and flanging rivet bolt into the positioning hole of the lower die, and then positioning the metal sheet and placing it on the piercing and flanging part; Step S3, start the stamping equipment and let the upper die move downward quickly, so that the puncture flanging part instantly stretches the metal sheet under the action of impact pressure to shape the metal sheet, and at the same time, the puncture flanging part forms a puncture flanging along the angle of the upper die punch, and the materials of the puncture flanging part and the metal sheet together fill the puncture flanging forming groove and are tightly riveted into one.

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