Sleeve for spin riveting connection
By designing a sleeve for rotary rivet connection, the extrusion deformation problem of multi-layer thin-walled parts by super-large rivets during rotary rivets is solved, and a stable and reliable connection effect is achieved.
Patent Information
- Application Number
- CN202422668888.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-10-31
AI Technical Summary
During the rivet, the extra-large rivets are prone to extrusion deformation of multi-layer thin-walled parts within a length of 10mm, resulting in the connection strength not meeting the requirements.
A sleeve for rotary rivet connection is designed, with a pipe body with an axial inner diameter. One end of the pipe body is equipped with a rolling flange and an inner corner of arc transition, the other end has steps and arc chamfers, and the inner wall is equipped with diamond-shaped mesh to protect the rivets from acting directly on the parts during the rotary rivet.
It effectively avoids extrusion deformation of the parts by rivets during the rivet, ensuring that the connection strength of the rivet connection meets the requirements.
Smart Images
Figure CN223215542U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of automobile parts manufacturing, in particular to a sleeve used for riveting connection. Background Art
[0002] During the manufacturing process, numerous parts must be connected to form an assembly. One common method of connection is spin riveting, a process that creates a connection through rotation and compression. The basic principle is to secure a rivet to the workpiece through rotation and compression. A rivet is inserted into a hole to be connected, typically passing through two or more parts to be joined. A spin riveting tool, such as a riveting gun, is used to rotate and compress one end of the rivet. The rotation and compression of the spin riveting tool gradually forms a head on one end of the rivet, securing the parts together.
[0003] Conventional rivets are categorized as small rivets (1mm-3mm in diameter); medium rivets (3mm-8mm in diameter); large rivets (8mm-20mm in diameter); and extra-large rivets (20mm and larger in diameter). Extra-large rivets are typically used for long-distance fastening. However, in automotive body structures, extra-large rivets are now required to connect multi-layer, thin-walled parts within a 10mm length. In these cases, the rivets are susceptible to rotational forces during the riveting process, causing deformation and insufficient joint strength. Utility Model Content
[0004] The utility model is intended to provide a sleeve for rotary riveting connection to solve the problem that when oversized rivets are used to connect multi-layer thin-walled parts within a length range of 10 mm, the rivets are easily squeezed by the rotating force during the rotary riveting process, causing the parts to deform and resulting in the riveted connection strength not meeting the requirements.
[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical solution: a sleeve for screw riveting connection, comprising a tube body with an axially constant inner diameter, a flange curled outward at one end of the tube body, the inner and outer corners between the flange and the tube body are both arc transitions, the width of the flange extending outside the outer diameter of the tube body is 3±0.3mm, a step is processed on the outer circumference of the other end of the tube body, and the root of the step is an arc chamfer.
[0006] Preferably, as an improvement, the inner edge of the end of the tube body stage is processed with a circular chamfer with a radius of 0.5±0.2 mm.
[0007] Preferably, as an improvement, the transition arc radius of the inner corner between the flange and the tube body is 1±0.2 mm.
[0008] Preferably, as an improvement, the radius of the arc chamfer at the root of the step is 0.5±0.1 mm.
[0009] Preferably, as an improvement, the height of the step is 1±0.1 mm.
[0010] Preferably, as an improvement, a diamond-shaped grid pattern is processed on the inner wall of the tube body between the step and the flange.
[0011] Preferably, as an improvement, the inner diameter of the tube is 45 mm.
[0012] The principles and advantages of this solution are as follows: In practical application, the oversized rivet is first inserted into the tube body, with the rivet head contacting the flange of the tube body. The tube body and the oversized rivet are then inserted into the rivet hole of the part to be connected. The oversized rivet tail is then spun using a riveting machine, causing the rivet tail and the tube step to be flattened together on the other side of the part, achieving a riveted connection of multi-layer thin-walled parts. During this process, the tube flange contacts the part on one side of the rivet hole, forming a protective barrier between the rivet head and the part. The middle of the tube body protects the shank from direct contact with the part under spinning pressure, preventing the rivet head and shank from directly contacting the part and causing deformation and damage. The circular chamfer between the tube body and the flange ensures a tight fit between the rivet head and the flange, providing a strong flange structure and stable and reliable connection. The circular chamfer at the step and its base allows the step to smoothly roll over to fit the part surface after being compressed, preventing material accumulation inside the rollover and causing compression and deformation of the part. The arc-shaped chamfer on the inner edge of the stage end prevents damage to the rivet head. The diamond-shaped grid pattern on the inner wall of the middle section of the tube increases friction between the shank and the tube, preventing shorter, oversized rivets from rotating with the rivet head during the riveting process, ensuring smooth and efficient riveting. This type of sleeve is suitable for riveting multi-layer thin-walled parts with oversized rivets within a length of 10mm. It effectively prevents the rivet from squeezing the parts during the riveting process, ensuring that the connection strength meets the requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.
[0014] Figure 2 It is a longitudinal sectional view of an embodiment of the present utility model. DETAILED DESCRIPTION
[0015] The following is further described in detail through specific implementation methods:
[0016] The reference numerals in the drawings of the specification include: tube body 1, flange 2, step 3, inner corner 4, circular chamfer r5, and circular chamfer R6.
[0017] The embodiment is basically as shown in the attached Figure 1 、 Figure 2 The figure shows a sleeve for riveting, comprising a tube body 1 with a uniform inner diameter in the axial direction, the inner diameter of which is 45 mm. The lower end of the tube body 1 is provided with an outwardly curled flange 2, extending 3 ± 0.3 mm beyond the outer diameter of the tube body 1. Both the inner and outer corners 4 between the flange 2 and the tube body 1 are circularly arc-shaped, with a radius of 1 ± 0.2 mm for the transition arc of the inner corner 4 between the flange 2 and the tube body 1. A step 3 is machined on the outer circumference of the other end of the tube body 1. The height of the step 3 is 1 ± 0.1 mm, and the base of the step 3 is formed with an arc chamfer R6 with a radius of 0.5 ± 0.1 mm. The inner edge of the end of the step 3 of the tube body 1 is machined with an arc chamfer r5 with a radius of 0.5 ± 0.2 mm.
[0018] The inner wall of the tube body 1 between the step 3 and the flange 2 is processed with a diamond grid pattern.
[0019] The specific implementation process is as follows: first, insert the oversized rivet into the tube body 1, so that the head of the oversized rivet contacts the flange 2 of the tube body 1, and then insert the tube body 1 and the oversized rivet into the rivet hole of the part to be connected. Then, the tail of the oversized rivet is spun by a rivet machine, so that the tail of the rivet and the step 3 sections of the tube body 1 are rotated and flattened together on the other side of the part, thereby realizing the rivet connection of multi-layer thin-walled parts. During the process, the flange 2 of the tube body 1 contacts the part on one side of the rivet hole, forming a protection between the rivet head and the part, and the middle part of the tube body 1 forms a protection between the shank and the part, preventing the rivet head and shank from directly acting on the part after being subjected to the spinning pressure, causing deformation and damage to the part. The arc chamfer between the tube body 1 and the flange 2 makes the rivet head fit tightly with the flange 2, making the flange 2 have high structural strength and can stably and reliably connect parts. The arc chamfer R6 at the step 3 and its root allows the step 3 section to be smoothly rolled up to fit the surface of the part after being compressed and avoids the formation of material accumulation on the inner side of the roll-up, which causes extrusion and deformation of the part. The arc chamfer r5 on the inner edge of the end of the step 3 section can avoid damage to the rivet head. The diamond grid pattern on the inner wall of the middle section of the tube body 1 can increase the friction between the nail rod and the tube body 1, preventing the shorter oversized rivets from rotating with the rivet head during the riveting process, ensuring that the riveting can be completed smoothly and efficiently. The use of such a sleeve for the riveting connection of multi-layer thin-walled parts with oversized rivets within a length of 10mm can effectively prevent the rivets from squeezing the parts during the riveting process, ensuring that the connection strength of the riveted connection meets the requirements.
[0020] The above description is merely an embodiment of the present invention, and the commonly known specific technical solutions and / or features of the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. A sleeve for riveting connection, characterized in that: It includes a tube body with axially constant inner diameter, and one end of the tube body is provided with a flange that curls outward. The inner and outer corners between the flange and the tube body are both arc transitions. The width of the flange extending outside the outer diameter of the tube body is 3±0.3mm. A step is processed on the outer circumference of the other end of the tube body, and the root of the step is an arc chamfer.
2. The sleeve for riveting connection according to claim 1, characterized in that: The inner edge of the end of the tube body stage is processed with a circular chamfer with a radius of 0.5±0.2mm.
3. The sleeve for riveting connection according to claim 2, characterized in that: The transition arc radius of the inner corner between the flange and the tube body is 1±0.2mm.
4. The sleeve for riveting connection according to claim 3, characterized in that: The radius of the arc chamfer at the root of the step is 0.5±0.1mm.
5. The sleeve for riveting connection according to claim 4, characterized in that: The height of the step is 1±0.1 mm.
6. The sleeve for riveting connection according to claim 1, characterized in that: The inner wall of the tube body between the step and the flange is processed with a diamond grid pattern.
7. The sleeve for riveting connection according to claim 1, characterized in that: The inner diameter of the tube is 45mm.