Improved rivet and riveting system

Abstract

The utility model discloses a kind of rivet and riveting system of tail tooth improved type, it is related to connecting piece technical field, the rivet in prior art can solve the problem that stress concentration is obvious in riveting process, influence riveting quality. The utility model embodiment discloses a kind of tail tooth improved type rivet, including rivet main body, rivet main body includes the main part and riveting part of integrated connection, riveting part includes recess structure, recess structure includes the arc diameter-reducing section of being close to main part setting, the recess structure also includes the taper stress section for with arc diameter-reducing section constitutes recess structure, the outer peripheral shape of taper stress section is conical curved surface, taper stress section is along the longitudinal section shape of rivet main body axial is isosceles trapezium.

Description

Technical Field

[0001] This utility model relates to the field of connector technology, specifically to an improved tail tooth rivet and riveting system. Background Technology

[0002] Currently, the industry mainly produces rivets with a single annular groove structure for the rivet tail tooth, although some rivets use threaded tail tooth structures. For rivets with a single annular groove structure, the groove is primarily an arc shape, and the annular groove is relatively easy to form through thread rolling. During riveting, all riveting forces are applied to a single annular groove, requiring the rivet helical groove to be relatively large. This results in significant stress concentration in both the rivet and the riveting clamping structure. Furthermore, because the existing annular grooves are primarily arc-shaped, the rivet and riveting clamping structure bear the force mainly on the arc surface, with different force components along the tangent of the arc. This further exacerbates the stress concentration in the rivet tail tooth and the riveting clamping structure. During riveting, the rivet tail tooth is prone to deformation, pull-out, and even breakage, affecting riveting quality and the post-riveting corrosion resistance of the rivet (due to rivet deformation, the anti-corrosion coating on the rivet is damaged). The riveting clamping structure, due to significant stress concentration, is also prone to fatigue fracture during use, resulting in a short service life and directly impacting riveting construction costs. Spiral groove rivets use threaded tail teeth. During riveting, the riveting clamping mechanism needs to be rotated to engage the rivet tail teeth with the clamping mechanism before riveting can proceed. After riveting is completed, the rivet needs to be rotated in the opposite direction to separate it from the clamping mechanism. The construction process is relatively inefficient and requires more complex riveting tools, which increases the cost of riveting.

[0003] Therefore, the inventors designed an improved tail tooth rivet and riveting system and hereby submit this application. Utility Model Content

[0004] The purpose of this application is to provide an improved tail tooth rivet and riveting system to solve the problem that stress concentration is obvious in the existing rivets during the riveting process, which affects the riveting quality.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following solution: On one hand, this application provides an improved tail tooth rivet, including a rivet body, the rivet body including an integrally connected main body and a riveting part, the riveting part including a groove structure, the groove structure including an arc-shaped diameter reduction section disposed near the main body, the groove structure also including a conical force-bearing section for forming the groove structure with the arc-shaped diameter reduction section, the outer peripheral shape of the conical force-bearing section being a conical curved surface, and the longitudinal section shape of the conical force-bearing section along the axial direction of the rivet body being an isosceles trapezoid.

[0006] Optionally, the groove structure further includes a transition expansion section disposed between the conical force-bearing section and the arc-shaped diameter-reducing section; The outer peripheral surface of the transition expansion section is a concave trumpet-shaped surface.

[0007] Optionally, the ratio of the transition expansion section and the tapered stress section before the radial projection of the groove structure is in the range of 0.2 to 0.6.

[0008] Optionally, the angle between the tapered surface of the tapered force-bearing section and the central axis of the rivet body is in the range of 40° to 80°.

[0009] Optionally, a chamfered section is provided between the tapered force-bearing section and the tail tooth end section.

[0010] Optionally, the strength of the riveted portion is greater than the strength of the main body portion.

[0011] On the other hand, this application provides a riveting system including any of the improved tail tooth rivets described above, and also includes a riveting clamping structure, the riveting clamping structure being provided with a tapered clamping section adapted to the tapered force-bearing section of the rivet body.

[0012] Optionally, the angle between the tapered clamping section and its central axis is equal to the angle between the tapered surface of the tapered force-bearing section and the central axis of the rivet body.

[0013] Optionally, the angle between the tapered clamping section and its central axis is 60°.

[0014] Beneficial effects of the utility model: I. This application improves the groove structure shape of existing single-groove rivets, transforming the traditional curved force-bearing surface into a conical surface. This ensures that when the rivet body is subjected to tension, the angle between the force-bearing surface and the central axis of the rivet body is the same at all positions, simplifying the stress distribution. The riveting force borne by the tail tooth of the rivet body can be evenly distributed on the conical surface, effectively avoiding stress concentration and thus preventing poor riveting quality.

[0015] Second, since the rivet body of this application has been improved into a conical surface for the stress-bearing surface during the riveting process, the shape of the clamping section of the riveting clamping structure of this application can also be improved into a corresponding conical surface. This allows the angle between each position of the stress-bearing surface and the central axis of the riveting clamping structure to remain consistent during the riveting process, resulting in more uniform stress distribution during the riveting process. This can effectively improve the service life of the riveting clamping structure and reduce the riveting construction cost. Attached Figure Description

[0016] The accompanying drawings, which are provided to further illustrate this application and form part of this application, do not constitute a limitation thereof.

[0017] Figure 1 This is a structural diagram of an existing single-groove rivet.

[0018] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of this application.

[0019] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0020] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of this application.

[0021] Explanation of reference numerals in the attached drawings: 1-Rivet body, 11-Main body, 111-Low strength zone, 112-Strength transition zone, 12-Riveting part, 121-Arc-shaped diameter reduction section, 122-Tail tooth end section, 123-Conical force-bearing section, 124-Transition diameter expansion section, 125-Chamfer section, 2-Riveting clamping structure, 21-Conical clamping section. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of this invention / utility model, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Example 1:

[0023] like Figures 1 to 3 As shown, this embodiment provides an improved tail tooth rivet, including a rivet body 1. The rivet body 1 includes an integrally connected main body portion 11 and a riveting portion 12. The riveting portion 12 includes a groove structure. The groove structure includes an arc-shaped diameter reduction section disposed near the main body portion 11. The groove structure also includes a conical force-bearing section 123 for forming the groove structure with the arc-shaped diameter reduction section. The outer peripheral shape of the conical force-bearing section 123 is a conical curved surface, and the longitudinal cross-sectional shape of the conical force-bearing section 123 along the axial direction of the rivet body 1 is an isosceles trapezoid.

[0024] This embodiment improves the groove structure shape of the existing single-groove rivet, transforming its traditional curved force-bearing surface into a conical surface. This ensures that when the rivet body 1 is subjected to tension, the angle between the force-bearing surface and the central axis of the rivet body 1 is the same at all positions, simplifying the stress distribution. The riveting force borne by the tail tooth of the rivet body 1 can be evenly distributed on the conical surface, effectively avoiding stress concentration and thus preventing poor riveting quality.

[0025] In this embodiment, the groove structure further includes a transition expansion section 124 disposed between the conical force-bearing section 123 and the arc-shaped diameter-reducing section; The outer peripheral surface of the transition expansion section 124 is a concave trumpet-shaped surface. In this embodiment, by setting the transition expansion section 124, the direct connection between the arc-shaped reduction section and the conical stress-bearing section 123 can be avoided, which would lead to stress concentration.

[0026] In this embodiment, the ratio of the transition expansion section 124 and the conical force-bearing section 123 before the radial projection of the groove is 0.5. Technicians can set the ratio of the two as needed. The function of the transition expansion section 124 is to serve as a transition structure between the arc-shaped reduction section and the conical force-bearing section 123. Therefore, its structural length does not need to be too long.

[0027] In this embodiment, the angle between the conical surface of the conical force-bearing section 123 and the central axis of the rivet body 1 is 60°. The angle between the conical surface and the central axis of the rivet body 1 should not be too large or too small. Technicians can also set the specific value of the angle to other values ​​between 40° and 80° as needed. Examples will not be given here.

[0028] In this embodiment, a chamfered section 125 is also provided between the tapered force-bearing section 123 and the tail tooth end section 122.

[0029] In this embodiment, the strength of the riveted part 12 is greater than the strength of the main body part 11.

[0030] In current rivet manufacturing processes, after the integral molding process, an integrated heat treatment process and a surface treatment process are required. Therefore, the mechanical strength of each part of the rivet body 1 is roughly the same, resulting in limited rivet strength. This is because the current riveting strength is mainly limited by the collar strength. If the collar strength is increased, the riveting force during the riveting process needs to be increased. However, increasing the riveting force of the rivet body 1 requires increasing the mechanical strength of the rivet body 1. But increasing the mechanical strength of the rivet body 1 will reduce the overall toughness of the rivet body 1, leading to an increased risk of breakage. Therefore, in this embodiment, the strength of the riveting part 12 of the rivet body 1 is greater than the strength of the main body part 11. This allows the rivet body 1 of this embodiment to withstand greater riveting force while maintaining the original toughness of the rivet body 1, thereby improving riveting performance. Example 2:

[0031] like Figure 4 As shown, this embodiment provides a riveting system, including any of the improved tail tooth rivets described above, and also includes a riveting clamping structure 2. The riveting clamping structure 2 is provided with a tapered clamping section 21 adapted to the tapered force-bearing section 123 of the rivet body 1.

[0032] Since the rivet body 1 in the above embodiment 1 has been improved into a conical surface for the force-bearing curved surface during the riveting process, the shape of the clamping section of the riveting clamping structure 2 in this embodiment has also been improved into a corresponding conical surface. This allows the angle between each position of the force-bearing surface of the riveting clamping structure 2 and the central axis of the riveting clamping structure 2 to remain consistent during the riveting process, making the force more uniform during the riveting process. This can effectively improve the service life of the riveting clamping structure 2 and reduce the riveting construction cost.

[0033] In this embodiment, the angle between the conical clamping section 21 and its central axis is equal to the angle between the conical curved surface of the conical force-bearing section 123 and the central axis of the rivet body 1. In this embodiment, the angle between the conical clamping section 21 and its central axis is equal to the angle between the conical curved surface of the conical force-bearing section 123 and the central axis of the rivet body 1, so that the clamping surface of the conical clamping section 21 is a conical surface and is parallel to the conical curved surface of the conical force-bearing section 123. After the riveting clamping structure 2 clamps the conical force-bearing section 123, the force can be distributed through the entire conical surface, which can avoid the problem of stress concentration.

[0034] In this embodiment, the angle between the tapered clamping section 21 and its central axis is 60°.

[0035] The remaining structures of this embodiment are the same as those of Embodiment 1 above, and will not be described again here.

[0036] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. An improved tail tooth rivet, comprising a rivet body (1), the rivet body (1) comprising an integrally connected main body portion (11) and a riveting portion (12), the riveting portion (12) comprising a groove structure, the groove structure comprising an arc-shaped diameter reduction section disposed near the main body portion (11), characterized in that, The groove structure also includes a conical force-bearing section (123) for forming a groove structure with the arc-shaped diameter reduction section. The outer periphery of the conical force-bearing section (123) is a conical curved surface, and the longitudinal section shape of the conical force-bearing section (123) along the axial direction of the rivet body (1) is an isosceles trapezoid.

2. The improved rivet with tail according to claim 1, wherein The groove structure also includes a transition expansion section (124) disposed between the conical force-bearing section (123) and the arc-shaped diameter reduction section. The outer peripheral surface of the transition expansion section (124) is a concave trumpet-shaped surface.

3. The rivet of claim 2, wherein, The ratio of the transition expansion section (124) and the tapered force-bearing section (123) before the radial projection of the groove structure is between 0.2 and 0.

6.

4. The improved rivet with tail according to claim 1, wherein The angle between the conical surface of the conical force-bearing section (123) and the central axis of the rivet body (1) is 40° to 80°.

5. The improved rivet with tail according to claim 1, wherein A chamfered section (125) is also provided between the conical force-bearing section (123) and the tail tooth end section (122).

6. The improved tail tooth rivet according to claim 1, characterized in that, The strength of the riveted part (12) is greater than that of the main body part (11).

7. A riveting system characterized by, The improved tail tooth rivet according to any one of claims 1-6 further includes a riveting clamping structure (2), which is provided with a tapered clamping section (21) adapted to the tapered force-bearing section (123) of the rivet body (1).

8. A riveting system according to claim 7, wherein The angle between the conical clamping section (21) and its central axis is the same as the angle between the conical curved surface of the conical force-bearing section (123) and the central axis of the rivet body (1).

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