Rivet pulling assembly

Abstract

The utility model provides a pulling rivet assembly. The pulling rivet assembly comprises a pulling rivet and a lantern ring arranged on the pulling rivet in a sleeving mode. Wherein the pulling rivet is made of medium-carbon alloy structural steel, and the lantern ring is made of low-carbon steel; the pulling rivet comprises a rivet core rod and a first iron-zinc-aluminum alloy protection layer wrapping the rivet core rod. The first iron-zinc-aluminum alloy protection layer is fixedly connected with the rivet core rod in a thermal diffusion manner; the lantern ring comprises a lantern ring body and a second iron-zinc-aluminum alloy protection layer wrapping the lantern ring body. The second iron-zinc-aluminum alloy protection layer is fixedly connected with the lantern ring body in a thermal diffusion mode. According to the technical scheme, zinc is diffused into the pulling rivet and the lantern ring by adopting a thermal diffusion treatment mode, and iron of the pulling rivet and the lantern ring is diffused into the zinc-aluminum coating, so that the iron-zinc-aluminum alloy protection layer is formed, the structural strength of the protection layer on the outer side of the pulling rivet and the outer side of the lantern ring is improved, the corrosion resistance is improved, and the service life of the pulling rivet and the lantern ring is prolonged. And the using effect of the pulling rivet and the lantern ring is improved.

Description

Technical Field

[0001] This application relates to the field of rivet technology, and more particularly to a rivet assembly. Background Technology

[0002] Rivets have a large clamping force and are not easily loosened. They were initially widely used in riveting structures of aircraft and were later applied to railway transportation equipment.

[0003] A rivet consists of a rivet body and a collar. During use, pulling the rivet body deforms the collar, thus securing the two mating parts together. The rivet body is made of medium-carbon alloy structural steel and undergoes cold heading, thread rolling, and heat treatment. The collar is made of low-carbon steel, cold-headed and then annealed. Depending on the application, existing technologies employ different surface treatment processes for the rivet body and collar assembly, such as blackening, electroplating, and Dacromet coating, all aimed at forming a physical coating on the rivet surface. However, the surface coating obtained by the above-mentioned treatment in the existing technology is not resistant to impact, extrusion, and wear. Especially during the installation of rivets, special rivet guns are required for tightening and extrusion operations, which inevitably damages the surface of the rivets and collars, destroying the integrity of the rivet surface coating. This leads to a decrease in the rust and corrosion resistance of the rivets and the riveted workpieces, and fails to meet the requirement of no red rust after 168 hours of neutral salt spray test on the surface coating of the rivets. Especially when applied to aluminum alloy vehicle bodies, there is a large potential difference corrosion between the rivets, collars, and aluminum alloys, making it even more difficult to meet the technical requirement of no red rust after 168 hours of neutral salt spray test on the surface of the rivets after riveting of aluminum alloy parts. Utility Model Content

[0004] This application provides a rivet assembly that improves the corrosion resistance of the rivet assembly.

[0005] This application provides a rivet assembly, which includes a rivet and a collar fitted on the rivet; wherein the rivet is made of medium carbon alloy structural steel and the collar is made of low carbon steel;

[0006] The rivet includes a core rod and a first iron-zinc-aluminum alloy protective layer wrapped around the core rod; the first iron-zinc-aluminum alloy protective layer is fixedly connected to the core rod by heat diffusion.

[0007] The collar includes a collar body and a second iron-zinc-aluminum alloy protective layer that wraps around the collar body; the second iron-zinc-aluminum alloy protective layer is fixedly connected to the collar body by thermal diffusion.

[0008] In the above technical solution, by adopting a thermal diffusion surface treatment method, zinc and aluminum diffuse into the rivet core and collar body. During this process, iron elements in the rivet and collar body can also diffuse into the zinc-aluminum coating, forming an iron-zinc-aluminum alloy protective layer. This improves the structural strength of the protective layer on the outside of the rivet and collar. Moreover, the iron-zinc-aluminum alloy protective layer is mutually penetrating and bonded with the body, adapting to the inevitable deformation of the rivet during installation and use, maintaining the integrity of the iron-zinc-aluminum alloy protective layer, avoiding damage to the surface of the rivet and collar caused by tightening and squeezing operations during installation, resisting impact, squeezing, and wear, adapting to the deformation of the rivet, and its surface coating remains continuous and intact with the deformation of the body, always maintaining the rust-proof and corrosion-proof performance of the rivet and the riveted workpiece, and improving the service effect of the rivet and collar.

[0009] In one specific implementation, the core rod includes a rod body with first and second protrusions spaced apart on the rod body; the collar is provided with stepped holes, wherein the rod body is located in the smaller diameter hole of the stepped holes, the first protrusion is located in the larger diameter hole of the stepped holes, and the second protrusion is located outside the collar; wherein...

[0010] The size of the first protrusion is smaller than the size of the second protrusion.

[0011] In one specific implementation, the second protrusion is a tapered protrusion.

[0012] In one specific implementation, the larger diameter hole in the stepped hole is provided with a flared opening that mates with the second protrusion.

[0013] In one specific implementation, the nail core is provided with a break-off notch.

[0014] In one specific implementation, the end of the collar opposite to the second protrusion is provided with an elastic layer for sealing the stepped hole; the elastic layer is provided with a cross-shaped slot for the nail core rod to pass through.

[0015] In one specific implementation, the elastic layer is bonded to the collar. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the rivet assembly provided in the embodiments of this application;

[0017] Figure 2 This is a schematic diagram of the structure of the collar provided in an embodiment of this application;

[0018] Figure 3 A top view of the collar provided in an embodiment of this application;

[0019] Figure 4 This is a structural schematic diagram of the rivet provided in an embodiment of this application.

[0020] 10. Collar 11. Collar body 12. Second iron-zinc-aluminum alloy protective layer 13. Elastic layer 14. Cross-shaped slot 15. Stepped hole 16. Flared end 17. Rivet 20. Rivet core 21. Rod body 211. First protrusion 212. Second protrusion 213. First iron-zinc-aluminum alloy protective layer 22. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0022] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of this specification should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar words used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] To facilitate understanding of the rivet assembly provided in this application embodiment, its application scenario is first described. The rivet assembly provided in this application embodiment serves as a connector for two mating parts. During use, the rivet assembly is tightened and compressed, causing damage to the rivet and collar surfaces, disrupting the continuity of the surface coating, and thus affecting the rust and corrosion resistance of the rivet, collar, and the riveted workpiece. Therefore, this application embodiment provides a rivet assembly to improve the corrosion resistance of the rivet assembly (rivet and collar). A detailed description follows with reference to specific drawings and embodiments.

[0024] refer to Figures 1-4 ,in, Figure 1 This is a schematic diagram of the structure of the rivet 20 assembly provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the collar 10 provided in the embodiments of this application; Figure 3 A top view of the collar 10 provided in an embodiment of this application; Figure 4This is a schematic diagram of the structure of the rivet 20 provided in this embodiment. The rivet 20 assembly provided in this embodiment mainly includes two parts: the rivet 20 and the collar 10. The collar 10 is fitted onto the rivet 20. In use, by pulling the rivet 20, the collar 10 deforms, thereby fixing the two mating parts together. In this embodiment, the rivet 20 is made of medium carbon alloy structural steel, while the collar 10 is made of low carbon steel, thus giving the entire rivet 20 assembly sufficient structural strength.

[0025] To improve the corrosion resistance of the rivet 20 assembly, the rivet 20 provided in this embodiment includes a core rod 21 and a first iron-zinc-aluminum alloy protective layer 22 wrapped around the core rod 21. The first iron-zinc-aluminum alloy protective layer 22 is fixedly connected to the core rod 21 by thermal diffusion. That is, an iron-zinc-aluminum alloy protective layer is formed on the outer surface of the core rod 21 to protect it. The iron-zinc-aluminum alloy has better ductility, better strength, and better corrosion resistance. Similarly, the collar 10 includes a collar body 11 and a second iron-zinc-aluminum alloy protective layer 12 wrapped around the collar body 11. The second iron-zinc-aluminum alloy protective layer 12 is fixedly connected to the collar body 11 by thermal diffusion. That is, an iron-zinc-aluminum alloy protective layer is also formed on the outside of the collar body 11 to protect it, thus improving the corrosion resistance of the collar 10.

[0026] The formation processes for the first iron-zinc-aluminum alloy protective layer 22 and the second iron-zinc-aluminum alloy protective layer 12 are the same. The following explanation uses the first iron-zinc-aluminum alloy protective layer 22 as an example. First, a zinc-aluminum coating is applied to the outer surface of the nail core rod 21. The zinc-aluminum coating is then cured, and a thermal diffusion treatment is performed on it. Through the thermal diffusion effect of metal ions, the iron element in the nail core rod 21 diffuses into the zinc-aluminum coating. At the same time, the zinc and aluminum elements in the zinc-aluminum coating diffuse into the nail core rod 21, thereby forming an iron-zinc-aluminum alloy protective layer on the surface of the nail core rod 21.

[0027] As can be seen from the above description, the rivet 20 assembly provided in this application adopts a thermal diffusion treatment method, which allows zinc to diffuse into the rivet 20 and collar 10, and iron from the rivet 20 and collar 10 to diffuse into the zinc-aluminum coating, thereby forming an iron-zinc-aluminum alloy protective layer. This improves the structural strength of the protective layer on the outside of the rivet 20 and collar 10, enhances corrosion resistance, and improves the performance of the rivet 20 and collar 10.

[0028] Continue to refer to Figures 1 to 4As shown, the nail core rod 21 provided in this embodiment includes a rod body 211 and a first protrusion 212 and a second protrusion 213 disposed on the rod body 211. The first protrusion 212 and the second protrusion 213 are used to cooperate with the collar 10, so that when the rod body 211 is pulled, the collar 10 is deformed, realizing the function of riveting the two components. In a specific configuration, the first protrusion 212 and the second protrusion 213 are arranged at intervals along the length direction of the rod body 211. Furthermore, the size of the first protrusion 212 is smaller than the size of the second protrusion 213. Correspondingly, a stepped hole 14 is provided on the collar 10, wherein the rod body 211 is located in the smaller diameter hole of the stepped hole 14, the first protrusion 212 is located in the larger diameter hole of the stepped hole 14, and the second protrusion 213 is located outside the collar 10. When the rod 211 is pulled, the first protrusion 212 abuts against the stepped surface of the stepped hole 14, while the second protrusion 213 abuts against the end of the collar 10. This causes the first protrusion 212 and the second protrusion 213 to simultaneously drive the collar 10 to deform, increasing the contact area between the collar 10 and the rivet rod 21. Furthermore, by driving the collar 10 to deform at different positions, it is easier for the collar 10 to deform, thus improving the performance of the rivet 20 assembly.

[0029] In one feasible embodiment, the second protrusion 213 is a tapered protrusion. Using a tapered protrusion makes it easier for the collar 10 to deform radially, improving the performance of the rivet 20 assembly.

[0030] In one feasible embodiment, the larger diameter hole in the stepped hole 14 is provided with a flared end 15 that mates with the second protrusion 213. In use, the flared end 15 mates with the second protrusion 213, making it easier for the collar 10 to deform in the radial direction.

[0031] In an alternative embodiment, a break-off notch 22 is provided on the nail core 21 to facilitate breakage. The notch 22 is located on the shaft 211 of the nail core 21, thereby facilitating breakage of the shaft 211.

[0032] In one feasible embodiment, the collar 10 provided in this application has an elastic layer 13 at the end opposite to the second protrusion 213 for sealing the stepped hole 14. This elastic layer 13 has a cross-shaped slot 131 for the nail core 21 to pass through. When the nail core 21 is inserted into the collar 10, it is exposed after passing through the cross-shaped slot 131 of the elastic layer 13. When the nail core 21 is broken, the broken end is located inside the collar 10, and the elastic layer 13 closes the cross-shaped slot 131 under its own elastic force, thereby shielding the broken end of the nail core 21 and reducing its probability of corrosion.

[0033] In one feasible embodiment, the elastic layer 13 is bonded to the collar 10. That is, the elastic layer 13 is bonded and fixed to the collar 10 using adhesive, facilitating the connection between the elastic layer 13 and the collar 10. Furthermore, the elastic layer 13 provided in this embodiment can be made of resin or other non-metallic materials with elastic properties.

[0034] One or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the scope of protection of this disclosure.

[0035] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A rivet assembly, characterized in that, It includes a rivet and a collar fitted on the rivet; wherein the rivet is made of medium carbon alloy structural steel and the collar is made of low carbon steel; The rivet includes a core rod and a first iron-zinc-aluminum alloy protective layer wrapped around the core rod; the first iron-zinc-aluminum alloy protective layer is fixedly connected to the core rod by heat diffusion. The collar includes a collar body and a second iron-zinc-aluminum alloy protective layer that wraps around the collar body; the second iron-zinc-aluminum alloy protective layer is fixedly connected to the collar body by thermal diffusion.

2. The rivet assembly according to claim 1, characterized in that, The core rod includes a rod body, with first and second protrusions spaced apart on the rod body; the collar is provided with stepped holes, wherein the rod body is located in the smaller diameter hole of the stepped holes, the first protrusion is located in the larger diameter hole of the stepped holes, and the second protrusion is located outside the collar; wherein... The size of the first protrusion is smaller than the size of the second protrusion.

3. The rivet assembly according to claim 2, characterized in that, The second protrusion is a conical protrusion.

4. The rivet assembly according to claim 3, characterized in that, The larger diameter hole in the stepped hole is provided with a flared opening that mates with the second protrusion.

5. The rivet assembly according to claim 2, characterized in that, The nail core rod is provided with a pull-out notch.

6. The rivet assembly according to any one of claims 2 to 5, characterized in that, The end of the collar opposite to the second protrusion is provided with an elastic layer for sealing the stepped hole; the elastic layer is provided with a cross-shaped slot for the nail core rod to pass through.

7. The rivet assembly according to claim 6, characterized in that, The elastic layer is bonded to the collar.

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