Hexagonal rivet nut

Abstract

The present application relates to the technical field of self-clinching nuts, and specifically discloses a hexagonal self-clinching nut, which includes a nut body and an annular protrusion, wherein the annular protrusion is integrally formed at one end of the nut body, and a plurality of diagonal teeth are provided on the outer peripheral wall of the annular protrusion, and the plurality of diagonal teeth are evenly arranged around the axis of the annular protrusion. The present application has the effect of improving the problem caused by strengthening the stability of the connection between the self-clinching nut and the sheet metal by expanding the annular protrusion.

Description

Technical Field

[0001] The present application relates to the technical field of self-clinching nuts, and in particular to a hexagonal self-clinching nut. Background Art

[0002] Compression rivet nuts, also known as rivet nuts and self-fastening nuts, are a type of nut used on thin plates or sheet metals. They are round in shape and have embossed teeth and guide grooves on one end. The principle is to press the embossed teeth into the preset holes of the sheet metal. Generally speaking, the aperture of the preset hole is slightly smaller than the embossed teeth of the rivet nut. The pressure causes the teeth of the rivet nut to squeeze into the plate, causing a slight plastic deformation around the preset hole. The deformed object is squeezed into the guide groove, thereby producing a locking effect. Compression rivet nuts combine the functions of rivets and nuts. During assembly, there is no need to tap internal threads on the sheet metal, no need to weld nuts, and the riveting is firm, convenient, and fast. They are widely used in the assembly of various products.

[0003] The self-clinching nut usually includes a nut body and an annular protrusion. The annular protrusion is coaxial and integrally formed at one end of the nut body. During assembly, the annular protrusion of the self-clinching nut is pressed into the preset hole of the sheet metal by a press. Usually, in order to ensure the stability of the connection between the self-clinching nut and the sheet metal, the annular protrusion needs to be expanded by a press. Although expanding the annular protrusion can enhance the stability of the connection between the self-clinching nut and the sheet metal, it increases the process and prolongs the assembly time; and the expansion of the annular protrusion can easily cause a large deformation of the preset hole of the sheet metal, thereby affecting the strength of the sheet metal. Utility Model Content

[0004] In order to improve the problem caused by strengthening the stability of the connection between the rivet nut and the sheet metal by expanding the annular protrusion, the present application provides a hexagonal rivet nut.

[0005] The hexagonal rivet nut provided in this application adopts the following technical solution:

[0006] A hexagonal self-clinching nut comprises a nut body and an annular protrusion, wherein the annular protrusion is integrally formed at one end of the nut body, a plurality of oblique teeth are provided on the outer peripheral wall of the annular protrusion, and the plurality of oblique teeth are evenly arranged around the axis of the annular protrusion.

[0007] By adopting the above technical scheme, when assembling the hexagonal self-clinching nut onto the sheet metal, it is only necessary to press the annular protrusion into the preset hole of the sheet metal by a press. The setting of the twill teeth on the annular protrusion increases the friction between the outer peripheral wall of the annular protrusion and the inner wall of the preset hole of the sheet metal. Through the force decomposition effect, the twill teeth not only increase the pull-out resistance of the hexagonal self-clinching nut along the axial direction, but also increase the torsional resistance of the hexagonal self-clinching nut around the axial rotation, thereby making the connection between the hexagonal self-clinching nut and the sheet metal more stable, eliminating the process of expanding the annular protrusion, and improving the problem caused by strengthening the stability of the connection between the self-clinching nut and the sheet metal by expanding the annular protrusion.

[0008] Optionally, the included angle between the oblique teeth and the axis of the annular protrusion is 45° to 60°.

[0009] By adopting the above technical solution, the setting of the angle between the oblique teeth and the axis of the annular protrusion can increase the friction resistance between the outer peripheral wall of the annular protrusion and the inner wall of the sheet metal preset hole to a large extent.

[0010] Optionally, the tooth width of the twill teeth is 0.8-1.2 mm, and the tooth depth is 0.3-0.7 mm.

[0011] By adopting the above technical solution, the setting of the tooth width and tooth depth of the twill teeth can greatly increase the friction between the annular protrusion and the inner wall of the sheet metal preset hole without affecting the strength of the annular protrusion.

[0012] Optionally, an end surface of the nut body close to one end of the annular protrusion is a concave arc surface.

[0013] By adopting the above technical solution, the concave arc surface is set so that the edge of the arc surface protrudes. When the annular protrusion is pressed into the preset hole of the sheet metal, the edge of the arc surface is inserted into the sheet metal under pressure, so that the nut body cannot rotate axially relative to the sheet metal, thereby improving the stability of the connection between the hexagonal rivet nut and the sheet metal.

[0014] Optionally, the nut body has a hexagonal shape, and the distance from the tip of the arc surface to the midpoint of the edge of the arc surface along the axial direction of the annular protrusion is not less than 0.7 mm.

[0015] By adopting the above technical solution, the distance from the tip of the arc surface to the midpoint of the edge of the arc surface along the axial direction of the annular protrusion is the depth of the nut body inserted into the sheet metal part. 0.7mm can not only ensure that the inserted part will not damage the strength of the sheet metal, but also bring better anti-rotation effect.

[0016] Optionally, a chamfer is provided at one end of the annular protrusion away from the nut body.

[0017] By adopting the above technical solution, the chamfered setting makes the annular protrusion smoother and easier to use when initially inserted into the preset hole of the sheet metal.

[0018] Optionally, a limiting groove is provided on the outer peripheral wall of the annular protrusion between the oblique teeth and the nut body.

[0019] By adopting the above technical solution and setting the limiting groove, when the annular protrusion is squeezed into the preset hole of the sheet metal, the deformed object generated by the extrusion deformation of the preset hole surrounding the preset hole due to the extrusion is squeezed into the limiting groove, so that the hexagonal self-clinching nut and the sheet metal are stably fixed, the pull-out resistance of the hexagonal self-clinching nut is improved, the structure is simple, and it is easy to use.

[0020] Optionally, a through hole is coaxially formed on the nut body and the annular protrusion, and an internal thread is formed on the inner wall of the through hole; and a cross-section of the through hole on a side of the nut body away from the annular protrusion is polygonal.

[0021] By adopting the above technical solution, the internal thread is used for threaded connection of screws for fastening, and the cross-section of the through hole on the side of the nut body away from the annular protrusion is set in a polygonal shape, so that the hexagonal self-clinching nut can be inspected or disassembled not only by a fixed wrench, but also by a hexagonal wrench.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. The setting of the diagonal teeth increases the friction between the outer peripheral wall of the annular protrusion and the inner wall of the pre-set hole of the sheet metal after the annular protrusion is pressed into the pre-set hole of the sheet metal by the press. Through the decomposition of force, the diagonal teeth not only increase the axial pull-out resistance of the annular protrusion, but also increase the anti-torsion performance of the annular protrusion around the axial rotation, thereby making the connection between the hexagonal rivet nut and the sheet metal more stable, and there is no need to expand the annular protrusion, which improves the problem caused by strengthening the stability of the connection between the rivet nut and the sheet metal by expanding the annular protrusion;

[0024] 2. The tooth width of the twill teeth is 0.8-1.2 mm, and the tooth depth is 0.3-0.7 mm, so that the friction between the outer peripheral wall of the annular protrusion and the inner wall of the sheet metal preset hole is greatly improved without interfering with the strength of the annular protrusion.

[0025] 3. The end face of the nut body close to one end of the annular protrusion is set as a concave arc surface, so that the edge of the end face of the nut body close to one end of the annular protrusion is convex. When the annular protrusion is pressed into the preset hole of the sheet metal, the convex edge of the nut body is inserted into the sheet metal under pressure, thereby preventing the hexagonal self-clinching nut from rotating around the axial direction and improving the stability of the connection between the hexagonal self-clinching nut and the sheet metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0028] Figure 2 is a side view of an embodiment of the present application;

[0029] Figure 3 It is a schematic diagram of the cross-sectional structure of the hexagonal rivet nut and the sheet metal in an assembled state in an embodiment of the present application.

[0030] Figure numerals: 1, nut body; 11, through hole; 111, internal thread; 12, regular hexagonal groove; 13, arc surface; 2, annular protrusion; 21, oblique teeth; 22, limiting groove; 3, sheet metal; 31, preset hole. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-3 This application is described in further detail.

[0032] The present application embodiment discloses a hexagonal self-clinching nut. Figure 1 The hexagonal self-clinching nut includes a nut body 1 and an annular protrusion 2. The annular protrusion 2 is integrally formed at one end of the nut body 1. The annular protrusion 2 is coaxially arranged with the nut body 1. A through hole 11 is coaxially provided on the nut body 1 and the annular protrusion 2. An internal thread 111 is provided on the inner wall of the through hole 11. The internal thread 111 is used for threaded connection of a screw for fastening. The nut body 1 has a regular hexagonal shape. The cross section of the through hole 11 on the side of the nut body 1 away from the annular protrusion 2 is a regular hexagon, that is, a regular hexagonal groove 12 is provided at one end of the nut body 1 away from the annular protrusion 2. The setting of the regular hexagonal groove 12 facilitates the disassembly of the hexagonal self-clinching nut by an inner hexagonal wrench. The hexagonal self-clinching nut can be made of carbon steel, and the surface treatment is environmentally friendly colored zinc plating. In other embodiments, the hexagonal self-clinching nut can also be made of stainless steel, and the surface treatment is passivation treatment, as long as the anti-corrosion function requirements of the hexagonal self-clinching nut can be met. A plurality of diagonal teeth 21 are formed on the outer peripheral wall of the annular protrusion 2. The plurality of diagonal teeth 21 are evenly arranged around the axis of the annular protrusion 2. The diagonal teeth 21 are formed by rolling with a embossing roller.

[0033] When assembling the hexagonal rivet nut on the sheet metal 3, the annular protrusion 2 is pressed into the preset hole 31 of the sheet metal 3 by a press machine, and the end face of the nut body 1 close to the annular protrusion 2 abuts against the wall of the sheet metal 3. The setting of the oblique teeth 21 on the annular protrusion 2 increases the friction between the annular protrusion 2 and the inner wall of the preset hole 31 of the sheet metal 3, and increases the pull-out resistance of the hexagonal rivet nut, thereby making the connection between the hexagonal rivet nut and the sheet metal 3 more stable, eliminating the process of expanding the annular protrusion 2, and improving the problem caused by expanding the annular protrusion 2 to strengthen the stability of the connection between the rivet nut and the sheet metal 3.

[0034] For example, refer to Figure 2, the angle between the length direction of the twill tooth 21 and the axis of the annular protrusion 2 is α, α is 45° to 60°, and in the embodiment of the present application, α adopts an angle of 45°. The setting of the angle of 45° can greatly increase the friction resistance between the outer peripheral wall of the annular protrusion 2 and the inner wall of the preset hole 31 of the sheet metal 3. Through the decomposition of force, the setting of the inclination angle of the twill tooth 21 can not only provide a large friction resistance to the axial movement of the annular protrusion 2, thereby improving the anti-pullout performance of the annular protrusion 2, but also provide a large friction resistance to the rotation of the annular protrusion 2 around the axis, thereby improving the anti-torsion performance of the annular protrusion 2. The structure is simple and easy to use. Exemplarily, the tooth width of the twill tooth 21 is set to 1mm, and the tooth depth is set to 0.5mm. The tooth depth represents the height difference of the groove between two adjacent twill teeth 21. The angle range of the two side walls of the groove is 30° to 60°. In the embodiment of the present application, an angle of 45° is adopted. The tooth width and tooth depth of the oblique teeth 21 can maximize the friction between the outer peripheral wall of the annular protrusion 2 and the inner wall of the preset hole 31 of the sheet metal 3 without affecting the strength of the annular protrusion 2. In addition, in order to facilitate the insertion of the annular protrusion 2 into the preset hole 31 of the sheet metal 3, the end of the annular protrusion 2 away from the nut body 1 is chamfered.

[0035] Reference Figure 2 and Figure 3 In order to further improve the stability of the connection between the hexagonal rivet nut and the sheet metal 3, the end face of the nut body 1 near the annular protrusion 2 is set to a concave arc surface 13, that is, the end face of the nut body 1 near the annular protrusion 2 presents six sharp claws. After the annular protrusion 2 is pressed into the preset hole 31 of the sheet metal 3 by the press, the six sharp claws on the end face of the nut body 1 near the annular protrusion 2 are inserted into the sheet metal 3, thereby forming a stable connection between the nut body 1 and the sheet metal 3, increasing the anti-torsion performance of the hexagonal rivet nut, with a simple structure and easy use. In order to further ensure the stability of the connection between the nut body 1 and the sheet metal 3, the distance from the tip of the six sharp claws to the midpoint of the edge of the arc surface 13 of the nut body 1 along the axial direction of the annular protrusion 2 is L, and L is set to be not less than 0.7mm.

[0036] In order to further improve the pull-out resistance of the hexagonal rivet nut, a limiting groove 22 is provided between the oblique teeth 21 and the nut body 1 on the outer peripheral wall of the annular protrusion 2, and the limiting groove 22 is arranged in a full circle around the axis of the annular protrusion 2. When the annular protrusion 2 is pressed into the preset hole 31 of the sheet metal 3, the oblique teeth 21 on the annular protrusion 2 squeeze into the preset hole 31 of the sheet metal 3, so that the periphery of the preset hole 31 produces a slight plastic deformation, and the deformed object is squeezed into the limiting groove 22, thereby limiting the axial movement of the annular protrusion 2, so as to achieve the purpose of improving the pull-out resistance of the hexagonal rivet nut, with a simple structure and convenient processing and manufacturing.

[0037] The implementation principle of the hexagonal rivet nut of the embodiment of the present application is as follows: when in use, the annular protrusion 2 of the hexagonal rivet nut is pressed into the preset hole 31 of the sheet metal 3 by a press machine. Since the diameter of the preset hole 31 of the sheet metal 3 is smaller than the diameter of the annular protrusion 2, the annular protrusion 2 causes a slight plastic deformation around the preset hole 31 when it is squeezed into the preset hole 31 of the sheet metal 3, and the deformed object is squeezed into the limiting groove 22 of the hexagonal rivet nut, thereby limiting the hexagonal rivet nut from being dislodged in the axial direction. Due to the setting of the oblique teeth 21 on the outer peripheral wall of the annular protrusion 2, the friction between the outer peripheral wall of the annular protrusion 2 and the inner wall of the preset hole 31 of the sheet metal 3 is greatly increased. The obliquely set oblique teeth 21 can simultaneously increase the pull-out resistance of the annular protrusion 2 in the axial direction and the torsion resistance of the axial rotation due to the force decomposition effect, thereby making the connection between the hexagonal rivet nut and the sheet metal 3 more stable. Furthermore, since the end face of the nut body 1 close to the annular protrusion 2 is a concave arc surface 13, when the annular protrusion 2 is pressed into the preset hole 31 of the sheet metal 3, the sharp corner of the arc surface 13 of the nut body 1 will be inserted into the sheet metal 3, thereby further increasing the stability of the connection between the hexagonal self-clinching nut and the sheet metal 3, eliminating the process of expanding the annular protrusion 2, and improving the problem caused by strengthening the stability of the connection between the self-clinching nut and the sheet metal 3 by expanding the annular protrusion 2.

[0038] The above are all optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A hexagonal self-clinching nut, comprising a nut body (1) and an annular protrusion (2), wherein the annular protrusion (2) is integrally formed at one end of the nut body (1), and characterized in that: A plurality of oblique teeth (21) are provided on the outer peripheral wall of the annular protrusion (2), and the plurality of oblique teeth (21) are evenly arranged around the axis of the annular protrusion (2).

2. The hexagonal self-clinching nut according to claim 1, characterized in that: The included angle between the oblique teeth (21) and the axis of the annular protrusion (2) is 45° to 60°.

3. The hexagonal self-clinching nut according to claim 1, characterized in that: The tooth width of the oblique teeth (21) is 0.8-1.2 mm, and the tooth depth is 0.3-0.7 mm.

4. The hexagonal self-clinching nut according to claim 1, characterized in that: The end surface of the nut body (1) close to one end of the annular protrusion (2) is a concave arc surface (13).

5. The hexagonal self-clinching nut according to claim 4, characterized in that: The nut body (1) has a hexagonal shape, and the distance from the tip of the arc surface (13) to the midpoint of the edge of the arc surface (13) along the axial direction of the annular protrusion (2) is not less than 0.7 mm.

6. The hexagonal self-clinching nut according to claim 1, characterized in that: One end of the annular protrusion (2) away from the nut body (1) is provided with a chamfer.

7. The hexagonal self-clinching nut according to claim 1, characterized in that: A limiting groove (22) is provided on the outer peripheral wall of the annular protrusion (2) between the oblique teeth (21) and the nut body (1).

8. The hexagonal self-clinching nut according to claim 1, characterized in that: A through hole (11) is coaxially formed on the nut body (1) and the annular protrusion (2), and an internal thread (111) is formed on the inner wall of the through hole (11); the through hole (11) on the side of the nut body (1) away from the annular protrusion (2) has a polygonal cross section.

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