Special rivet body for internally-locked wire-drawing rivet

Abstract

The utility model discloses a special rivet body for an internal locking wire drawing rivet, which comprises a rivet body, a rivet core hole is arranged in the rivet body, a pipe orifice inner hole is arranged at one end of the rivet core hole close to a pipe orifice, an upper punching hole is arranged at one end of the rivet core hole close to a flange, and a barb scraping hole is arranged between the upper punching hole and the rivet core hole. And the apertures of the pipe orifice inner hole, the rivet core hole, the barb scraping hole and the upper punching hole are gradually reduced in sequence. According to the special rivet body for the internally-locked wire-drawing rivet, the problems of some abnormities in application, such as springback of a rivet core cup body after riveting, loosening and abnormal sound, cracking of a pipe orifice, infirm fixation of a cup riveting workpiece and the like are avoided; before installation and use, the rivet body is prevented from being separated from the rivet core, and installation and use are smoother; and meanwhile, abnormal quality and product scrapping generated in the production process are avoided, and the cost is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to a special nail body for an internal locking wire-pulling rivet. Background Technology

[0002] Conventional internal locking wire-drawing rivets have the following defects: There is no scraping transition zone between the upper punch hole and the rivet core hole, which affects the scraping and locking of the rivet core barb diameter after riveting; after the rivet shank enters the tube opening, the scraping diameter of the rivet core expands the shank diameter, exceeding the diameter requirements of the drawing; the connection between the upper punch hole and the rivet core hole is usually concave outwards, forming an angled angle, which, after riveting, fails to hold the rivet core, causing the rivet core cup to be pulled through or unable to lock the rivet head, resulting in the cup body springing back and loosening; to cold-forging through and remove waste material without producing burrs, the tube opening of the upper punch hole is usually set as a stepped hole with a large and deep diameter, resulting in a short upper punch hole length. After assembly, this part rubs against and is fixed to the vertical teeth of the rivet core, with a short distance, affecting the rivet core holding force and ultimately affecting customer installation and use; the tube opening of the rivet body is internally angled, which makes the rivet core cup prone to cracking after drilling after riveting, forming a crack and affecting the mechanical strength of the product. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of the existing technology and provide a special nail body for internal locking wire drawing rivets, which can avoid problems such as the rebound of the nail core cup after riveting, loosening and abnormal noise, cracking of the tube opening, and insecure fixing of the cup riveted workpiece, thereby reducing the product scrap rate and greatly reducing production costs.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a special nail body for internal locking wire drawing rivets, including a nail body body, a nail core hole is opened in the nail body body, an inner hole is opened at one end of the nail core hole near the pipe opening, and an upper punch hole is opened at the end near the flange, and a barbed scraping hole is provided between the upper punch hole and the nail core hole, and the diameters of the inner hole of the pipe opening, the nail core hole, the barbed scraping hole and the upper punch hole gradually decrease in size.

[0005] Furthermore, the inner diameter of the pipe opening is greater than... Nail core scraping section diameter.

[0006] Furthermore, the length of the inner hole of the tube varies depending on the diameter of the rod of the nail body made of different materials. for Made of aluminum alloy and carbon steel, when the diameter of the nail body shank is When φ4.8mm, The length of the inner hole of the pipe is 0.8~1.4mm, When the nail rod The diameter of the part is When φ6.4mm, Inner diameter of the pipe opening It ranges from 1.2 to 1.8. mm; For stainless steel, when the diameter of the nail shank is φ When the diameter is 4.8mm, the inner hole length is 0.6–1.2mm; when the nail body diameter is 6.4mm, the inner hole length is 0.9mm. ~1.5mm.

[0007] Furthermore, the diameter of the barbed scraper hole matches the diameter of the nail core scraper section.

[0008] Furthermore, the distance L1 between the side of the barbed scraper hole closest to the flange and the flange end face is greater than 0. Far from the flange The distance from one side to the flange end face is L2, and L2 varies depending on the diameter of the nail shank. When the diameter of the nail shank is... When φ4.8mm, L2 is 0.8~2.0mm; when The diameter of the nail shaft is When φ6.4mm, L2 is 1.2~3.0mm.

[0009] Furthermore, the transition between the upper punch hole and the barbed scraper hole is set at a right angle or with a concave structure.

[0010] Furthermore, the concave angle θ is 2° to 3°.

[0011] Furthermore, a rounded corner is provided at the transition between the upper punch and the flange, with a rounded corner radius of 0.2 to 0.5 mm.

[0012] Furthermore, the inner end face of the tube opening is flush with the end face of the nail body.

[0013] The beneficial effects of this utility model's special nail body for internal locking wire-drawing rivets are:

[0014] 1. Add a barbed scraper hole between the upper punch hole and the nail core hole. The hole diameter matches the scraper diameter. After riveting, the barbed diameter scrapes the material evenly, resulting in a stronger lock.

[0015] 2. The nozzle of the nail body is enlarged with an inner hole that matches the diameter of the nail core scraper, so that after the nail core is assembled, this part is effectively avoided, preventing the nail body diameter from expanding and the dimensions meet the requirements of the drawing;

[0016] 3. The connection between the upper punch hole and the barbed scraper hole is designed to be at a right angle or concave by 2-3°. When riveting and locking, the scraper diameter can better fill the barbed diameter to form a ring lock, which has a stronger locking ability.

[0017] 4. The tube opening of the punched hole is designed with a radius of 0.2 to 0.5 mm. The purpose is to allow the burrs at the hole opening to be turned out and then squeezed back after the inner hole is drilled through. This can effectively increase the length of the small hole, and the vertical teeth of the nail core have a larger contact surface, making them more firmly in contact with the nail core. This makes it less likely for the customer to loosen or fall off after installation.

[0018] 5. The tube opening of the nail body is designed to be flat, that is, the inner end face of the tube opening is flush with the end face of the nail body. This part is shaped in the previous process to avoid cracks caused by shearing, and to ensure that the tube opening does not crack during the expansion of the tube opening after mass riveting, thus preventing riveting failure and affecting the mechanical strength. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0022] In the diagram: 1. Nail body, 2. Flange, 3. Inner hole of pipe opening, 4. Nail core hole, 5. Barrel scraping hole, 6. Top punch hole. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0024] like Figure 1 The internal locking wire-pulling rivet body shown includes a rivet body 1, a rivet core hole 4 inside the rivet body 1, an inner hole 3 at one end of the rivet core hole 4 near the pipe opening, and an upper punch hole 6 at the other end near the flange 2. A barbed scraping hole 5 is provided between the upper punch hole 6 and the rivet core hole 4. The diameters of the inner hole 3, the rivet core hole 4, the barbed scraping hole 5, and the upper punch hole 6 gradually decrease in size.

[0025] The inner diameter of the pipe opening is greater than 3. Nail core scraping section diameter.

[0026] The length of the inner hole 3 varies depending on the diameter of the shank of the nail body made of different materials; for aluminum alloy and carbon steel, the length varies. Material, when the diameter of the nail body shank is When the diameter is φ4.8mm, the inner diameter of the pipe opening is 0.8~1.4mm. When the diameter of the nail shank is When φ6.4mm, Inner diameter of the pipe opening The thickness is 1.2–1.8 mm; for stainless steel, When the diameter of the nail shank is φ4.8mm, the tube The length of the inner hole is 0.6 to 1.2 mm. When the diameter of the nail body is φ6.4 mm, the length of the inner hole is 0.9 to 1.5 mm.

[0027] The diameter of the barbed scraper hole 5 matches the diameter of the nail core scraper section.

[0028] The distance L1 > 0 between the side of the barbed scraper hole 5 closest to flange 2 and the flange end face. Distance method on the side away from flange 2 The distance between the flange ends is L2, which varies depending on the diameter of the nail shank. When the diameter of the nail shank is... When φ4.8mm, L2 is 0.8~2.0mm; when The diameter of the nail shaft is When φ6.4mm, L2 is 1.2~3.0mm.

[0029] The transition between the upper punch hole 6 and the barbed scraper hole 5 is set as a right angle or a concave structure, with a concave angle θ of 2° to 3°. When riveting and locking, the scraper diameter can better fill the barbed diameter to form a circular lock, which has a stronger locking ability.

[0030] A rounded corner is provided at the transition between the upper punch hole 6 and the flange 2, with a rounded corner radius of 0.2 to 0.5 mm. The purpose is to allow the burrs at the hole opening to be turned out and then squeezed back after the inner hole is drilled through, which can effectively lengthen the small hole. The diameter of the vertical teeth of the nail core is large, and the contact surface is more secure with the nail core, so that it is not easy for the customer to loosen or fall off after installation.

[0031] The inner hole 3 end face of the tube is flush with the end face of the nail body 1, that is, the tube opening part of the nail body is designed to be flat. This part has been shaped by the previous station to avoid cracks caused by shearing. This ensures that after mass riveting, the tube opening will not crack due to expansion, which would lead to riveting failure and affect the mechanical strength.

[0032] This invention avoids some riveting abnormalities in application, such as springback of the rivet core cup body after riveting, loosening and abnormal noise, cracking of the tube opening, and insecure fixing of the cup riveted workpiece; it prevents the rivet body from separating from the rivet core before installation and use, making installation and use smoother; and it reduces quality abnormalities and product scrap during the production process, greatly reducing costs.

[0033] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A special nail body for an internal locking wire-drawing rivet, characterized in that: The device includes a nail body (1), a nail core hole (4) is provided inside the nail body (1), the nail core hole (4) has an inner hole (3) near the pipe opening and an upper punch hole (6) near the flange (2), and a barbed scraping hole (5) is provided between the upper punch hole (6) and the nail core hole (4). The diameters of the inner hole (3), the nail core hole (4), the barbed scraping hole (5) and the upper punch hole (6) gradually decrease in size.

2. The special nail body for an internal locking wire-drawing rivet according to claim 1, characterized in that: The diameter of the inner hole (3) of the pipe opening is greater than Nail core scraping section diameter.

3. The special nail body for an internal locking wire-drawing rivet according to claim 1, characterized in that: The inner hole (3) of the pipe opening is described. The length varies depending on the diameter of the shank of the nail body, which is made of different materials. For aluminum alloy and carbon steel, when the shank is straight... Path When φ4.8mm, The length of the inner hole of the pipe is 0.8~1.4mm, When the diameter of the nail shank is When φ6.4mm, Inner diameter of the pipe The thickness is 1.2–1.8 mm; for stainless steel, when When the diameter of the nail shank is φ4.8mm, the length of the inner hole at the nozzle is 0.6~ 1.2mm; when the diameter of the nail body rod is φ6.4mm, the length of the inner hole of the tube opening is 0.9~1.5mm.

4. The special nail body for an internal locking wire-drawing rivet according to claim 1, characterized in that: The diameter of the barbed scraper hole (5) is matched with the diameter of the nail core scraper section.

5. The special nail body for an internal locking wire-drawing rivet according to claim 1, characterized in that: The distance L1 > 0 between the side of the barbed scraper hole (5) near the flange (2) and the flange end face. The distance from the flange end face on the side furthest from flange (2) Let L2 be the diameter of the nail shank. L2 varies depending on the diameter of the nail shank. When the diameter of the nail shank is... When φ4.8mm, L2 is 0.8~2.0mm; when The diameter of the nail shaft is When φ6.4mm, L2 is 1.2~3.0mm.

6. The special nail body for an internal locking wire-drawing rivet according to claim 1, characterized in that: The transition between the upper punch hole (6) and the barbed scraper hole (5) is set as a right angle or a concave structure.

7. The special nail body for an internal locking wire-drawing rivet according to claim 6, characterized in that: The concave angle θ is 2° to 3°.

8. The special nail body for an internal locking wire-drawing rivet according to claim 1, characterized in that: The transition between the upper punch (6) and the flange (2) is provided with a rounded corner, and the radius of the rounded corner is 0.2 to 0.5 mm.

9. The special nail body for an internal locking wire-drawing rivet according to claim 1, characterized in that: The end face of the inner hole (3) of the tube is flush with the end face of the nail body (1).

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