Round self-puncturing pressing rivet nut for thin plate

Abstract

The utility model relates to a round self-puncturing pressing rivet nut for a thin plate, which belongs to the technical field of nuts and comprises a spline tooth structure, a circular ring structure, a rivet ring and a nut body. The annular structure, the flower tooth structure and the riveting ring are sequentially installed on the end face of the nut body from outside to inside. The flower tooth structure comprises arc-shaped flower teeth; the arc-shaped teeth are evenly arranged on the front face of the nut body in a surrounding mode on the inner side of the annular structure. The outer side face of the rivet ring and the nut body form a conical angle. The height of the annular structure is higher than that of the spline tooth structure and lower than that of the rivet ring; the nut body is provided with a center hole used for being connected with a bolt. The press riveting device is suitable for press riveting of thin plates, does not need pre-trepanning, and is good in riveting performance, high in connection strength, high in mechanical performance and small in installation space limitation.

Description

Technical Field

[0001] The utility model relates to the technical field of nuts, in particular to a circular self-piercing pressure riveting nut for thin plates. Background Art

[0002] Nuts are a kind of fasteners commonly used in various fields such as civil, commercial, and military industries, especially in large machinery such as automobiles and aviation. In the prior art, the rivet nut usually has embossed teeth and guide grooves on one end, such as Figure 1 As shown, the parent material needs to be pre-drilled before riveting. Generally speaking, the diameter of the installation hole is slightly smaller than the outer diameter of the flower teeth. Under the action of the riveting machine, the flower teeth can be squeezed into the material, causing plastic deformation around the installation hole. The deformed material is squeezed into the guide groove, and finally a locking connection is achieved. Rivet nuts can be installed in various aluminum alloy profiles and plates. However, when riveting thin plates, this type of riveting nut has poor riveting performance because the flower teeth do not penetrate much material into the plate and the bottom of the guide groove is less stuck. Especially for sheet metal parts below 2mm, the connection strength is greatly affected by the strength of the parent material. In addition, during the process of installing the nut on the sheet metal, the sheet metal needs to be pre-drilled to ensure that the riveting die can contact the nut, and the installation space is limited. Utility Model Content

[0003] In order to solve the problems existing in the above-mentioned prior art, the utility model provides a circular self-piercing self-rivet nut for thin plates, which is convenient for the self-rivet installation of thin plates, has good riveting performance and high connection strength, and improves the mechanical properties of the circular self-piercing self-rivet nut.

[0004] To achieve the above purpose, the specific technical solution of the utility model is as follows:

[0005] A circular self-piercing self-rivet nut for thin plates, the circular self-piercing self-rivet nut comprising a tooth structure, a circular ring structure, a rivet ring and a nut body;

[0006] The circular ring structure, the tooth structure and the rivet ring are sequentially mounted on the end face of the nut body from outside to inside; the tooth structure includes arc-shaped teeth; a plurality of arc-shaped teeth are evenly arranged on the front face of the nut body inside the circular ring structure; the outer side of the rivet ring forms a tapered angle with the nut body; the height of the circular ring structure is higher than the tooth structure and lower than the rivet ring; the nut body has a center hole for connection with a bolt.

[0007] Furthermore, the tooth structure also includes strip-shaped teeth; the strip-shaped teeth are installed on the front side of the nut body between two adjacent arc-shaped teeth, and two ends of the strip-shaped teeth are respectively connected to the annular structure and the rivet ring.

[0008] Furthermore, the top surfaces of the arc-shaped flower teeth and the strip-shaped flower teeth are flush.

[0009] Furthermore, two sides of the outer ends of the strip-shaped flower teeth are connected to the arc-shaped flower teeth, and the connecting parts have the arc angle.

[0010] Furthermore, a groove is formed between the flower tooth structure and the rivet ring.

[0011] Furthermore, the top surface of the circular ring structure is a supporting surface, the circular ring structure is a circular ring inclined toward the center direction of the nut body, and the inner bottom of the circular ring structure has a circle of inverted cone angle.

[0012] Furthermore, the annular structure is arranged on the end surface edge of the nut body and is coaxial with the nut body.

[0013] Furthermore, the rivet ring is arranged on the end surface of the nut body around the center hole; and the inner bottom of the rivet ring overlaps with the center hole of the nut body.

[0014] Furthermore, the rivet ring is an annular inverted cone hole boss, and the inverted cone hole boss is composed of an inclined surface and a circular ring, and the inner and outer sides of the circular ring respectively have the inclined surfaces inclined toward the outer side of the nut body.

[0015] Furthermore, the rivet ring gradually becomes thinner from the bottom to the top.

[0016] Beneficial effects of the utility model:

[0017] The utility model has a simple structure and an ingenious design, does not require pre-drilling, is suitable for riveting thin plates, has good riveting performance, high connection strength, high mechanical properties, and small installation space limitations.

[0018] The nut of the utility model does not need to pre-drill holes in the sheet metal, and the rivet ring can easily pierce the sheet metal under the action of the riveting die to achieve riveting.

[0019] During the riveting process, the arc-shaped flower teeth of the utility model push material toward the bottom of the rivet ring, so that the material fluidity is better and the sheet metal material is filled more fully. Combined with the tapered angle of the bottom of the rivet ring, more sheet metal material can be embedded in the bottom of the rivet ring. Under the action of the riveting ring after riveting, a circular material filling is formed, so that the sheet metal is firmly clamped in the nut. After riveting, the torsion and push resistance of the thin plate are stronger.

[0020] The inverted cone angle set at the bottom of the circular ring structure of the utility model can not only transition the strip-shaped teeth and the arc angle, but also enable the sheet metal material to flow better to the bottom of the circular ring structure during the riveting process, thereby better embedding the sheet metal material and increasing the pushing force.

[0021] The arc-shaped teeth, strip-shaped teeth and grooves of the utility model are all stress-bearing surfaces during the rotation of the bolt, so that the circular self-piercing rivet nut has better anti-rotation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of a pressure rivet nut in the prior art;

[0023] Figure 2 This is a front view of the circular self-piercing rivet nut for thin plates of the utility model;

[0024] Figure 3 It is a schematic diagram of the back side of the circular self-piercing rivet nut for thin plates of the utility model;

[0025] Figure 4 This is a side cross-sectional view of a circular self-piercing rivet nut for a thin plate according to the utility model;

[0026] Figure 5 This is a cross-sectional view of the circular self-piercing rivet nut for thin plates after riveting;

[0027] Figure 6 It is a top view of the circular self-piercing rivet nut for thin plates of the utility model;

[0028] Figure 7 This is a front view of the circular self-piercing rivet nut for thin plates of the utility model;

[0029] Figure 8 It is a cross-sectional view of the body of the circular self-piercing rivet nut for thin plates of the utility model.

[0030] Among them: 1-arc-shaped teeth, 2-strip-shaped teeth, 3-circular ring structure, 4-rivet ring, 5-arc angle, 6-groove, 7-nut body, 8-internal thread, 9-sheet metal. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present application, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] The terms such as up, down, left, right, front and back in this application document are based on the positional relationships shown in the drawings. If the drawings are different, the corresponding positional relationships may also change accordingly, so they cannot be understood as limiting the scope of protection.

[0033] In the present utility model, the terms "install", "connected", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection or mutual communication, a direct connection, an indirect connection through an intermediate medium, the internal connection of two components, or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] This embodiment describes a circular self-piercing rivet nut for thin plates, which is suitable for the rivet connection of thin plates.

[0035] like Figures 2 to 7 As shown, the circular self-piercing rivet nut includes a tooth structure, a circular ring structure 3, a rivet ring 4 and a nut body 7.

[0036] The nut body 7 is the carrier of the circular self-piercing rivet nut, and can adopt a hollow cylindrical structure. The annular structure 3, the tooth structure and the rivet ring 4 are sequentially installed on the front of the nut body 7 from the outside to the inside. The annular structure 3 and the rivet ring 4 are coaxially installed on the front of the nut body 7 around the outer edge and the center hole of the front of the nut body 7 respectively. The nut body 7 of this embodiment is heat-treated during the molding process, which effectively improves the hardness and strength of the body, prolongs the service life, and is applicable to a wider installation environment and range.

[0037] The tooth structure of this embodiment includes arc-shaped teeth 1 and strip-shaped teeth 2. A plurality of arc-shaped teeth 1 are evenly arranged on the front side of the nut body 7 inside the circular ring structure 3, and strip-shaped teeth 2 are installed on the front side of the nut body 7 between two adjacent arc-shaped teeth 1. The two ends of the strip-shaped teeth 2 are respectively connected to the circular ring structure 3 and the rivet ring 4. The top surfaces of the arc-shaped teeth 1 and the strip-shaped teeth 2 are flush, and are lower than the height of the top surface of the circular ring structure 3. In this embodiment, the outer ends of the strip-shaped teeth 2 are connected to the arc-shaped teeth 1 on both sides, and there is an arc angle 5 at the connection point, which plays a role in the smooth connection and transition between the arc-shaped teeth 1 and the strip-shaped teeth 2. Preferably, the radius of the arc angle 5 is 0.5 to 0.7 mm.

[0038] During riveting, the arc-shaped teeth 1 can press the riveted sheet metal 9 (see Figure 8 ) is better pushed toward the bottom of the rivet ring 4, thereby increasing the push-out force after riveting and providing torsion resistance. The strip-shaped flower teeth 2 can further enhance the torsion resistance of the sheet metal 9 after riveting.

[0039] A groove 6 is formed between the tooth structure and the rivet ring 4. The groove 6 can accommodate more sheet metal 9 after the sheet metal 9 is riveted, so that the circular self-piercing rivet nut can better embed with the sheet metal 9, further improving the anti-torsion and anti-push-out performance.

[0040] The annular structure 3 of this embodiment is coaxially mounted on the outer edge of the front face of the nut body 7. The top surface of the annular structure 3 is a support surface for carrying the sheet metal to be riveted. The annular structure 3 is a circular ring inclined toward the center of the nut body 7, and a circle of inverted cone angle a is formed at its inner bottom. Preferably, the inverted cone angle a is 70° to 80°. During riveting, the annular structure 3 with this inverted cone angle a can better clamp the material, so that the circular self-piercing rivet nut and the sheet metal 9 fit tightly, forming a better anti-push-out performance.

[0041] The rivet ring 4 of this embodiment is coaxially installed on the front side of the nut body 7 around the center hole of the nut body 7, and is used to pierce the sheet metal 9 to complete the riveting, and the inner bottom of the rivet ring 4 overlaps with the center hole of the nut body 7. The rivet ring 4 of this embodiment is an annular inverted cone hole boss, and the top surface of the rivet ring 4 is higher than the top surface of the circular ring structure 3. The inverted cone hole boss is composed of an inclined surface and a circular ring. The inner and outer sides of the circular ring respectively have inclined surfaces inclined toward the outside of the nut body 7, and the rivet ring 4 gradually becomes thinner from the bottom to the top. The outer side of the rivet ring 4 forms a cone angle b with the front side of the nut body 7. The cone area formed at the cone angle b is used to accommodate the sheet metal 9, thereby forming a better anti-push-out performance. Preferably, the cone angle b is 75° to 85°.

[0042] The center hole of the nut body 7 and the lower inner side of the rivet ring 4 are provided with internal threads 8 for threaded connection with the bolt.

[0043] When the circular self-piercing rivet nut of this embodiment is applied to a thin plate, the sheet metal 9 is first placed on the circular self-piercing rivet nut, and the mold tooling applies pressure from top to bottom to rivet the sheet metal 9. Under the action of the rivet ring 4, the rivet ring 4 pierces the sheet metal 9 and automatically punches out a prefabricated hole on the sheet metal 9 to achieve riveting without pre-drilling holes on the sheet metal 9. During the riveting process, the lower molding die of the mold tooling presses the sheet metal 9 into the groove 6 of the circular self-piercing rivet nut to ensure that the circular self-piercing rivet nut is fixed in the opponent. And during the riveting process, the arc-shaped flower teeth 1 push the material to the bottom of the rivet ring 4, so that the sheet metal 9 material can flow better, thereby embedding into the groove 6 to complete the riveting. The arc-shaped flower teeth 1, the strip-shaped flower teeth 2 and the groove 6 are all force-bearing surfaces during the rotation of the bolt, so that the circular self-piercing rivet nut has better anti-rotation performance.

[0044] Although the principle of the present invention is described in detail above in conjunction with the preferred embodiments of the present invention, those skilled in the art should understand that the above embodiments are merely explanations of the exemplary implementation of the present invention, and are not intended to limit the scope of the present invention. The details in the embodiments do not constitute limitations on the scope of the present invention. Without departing from the spirit and scope of the present invention, any obvious changes such as equivalent transformations and simple replacements based on the technical solution of the present invention fall within the scope of protection of the present invention.

Claims

1. A circular self-piercing rivet nut for thin plates, characterized in that: The circular self-piercing rivet nut comprises a tooth structure, a circular ring structure (3), a rivet ring (4) and a nut body (7); The annular structure (3), the tooth structure and the rivet ring (4) are sequentially mounted on the end face of the nut body (7) from the outside to the inside; the tooth structure comprises arc-shaped teeth (1); a plurality of arc-shaped teeth (1) are evenly arranged on the front face of the nut body (7) on the inner side of the annular structure (3); the outer side of the rivet ring (4) forms a conical angle with the nut body (7); the height of the annular structure (3) is higher than the tooth structure and lower than the rivet ring (4); and the nut body (7) has a central hole for connection with a bolt.

2. The circular self-piercing rivet nut for thin plates according to claim 1, characterized in that: The tooth structure further comprises strip-shaped teeth (2); the strip-shaped teeth (2) are mounted on the front side of the nut body (7) between two adjacent arc-shaped teeth (1), and the two ends of the strip-shaped teeth (2) are respectively connected to the annular structure (3) and the rivet ring (4).

3. The circular self-piercing rivet nut for thin plates according to claim 2, characterized in that: The top surfaces of the arc-shaped flower teeth (1) and the strip-shaped flower teeth (2) are flush.

4. The circular self-piercing rivet nut for thin plates according to claim 2, characterized in that: The outer ends of the strip-shaped flower teeth (2) are connected to the arc-shaped flower teeth (1) at both sides, and the connecting parts have arc angles (5).

5. The circular self-piercing rivet nut for thin plates according to claim 1, characterized in that: A groove (6) is formed between the flower tooth structure and the rivet ring (4).

6. The circular self-piercing rivet nut for thin plates according to claim 1, characterized in that: The top surface of the annular structure (3) is a supporting surface. The annular structure (3) is a circular ring inclined toward the center of the nut body (7). The inner bottom of the annular structure (3) has a circle of inverted cone angle.

7. The circular self-piercing rivet nut for thin plates according to claim 1 or 6, characterized in that: The annular structure (3) is arranged on the edge of the end surface of the nut body (7) and is coaxial with the nut body (7).

8. The circular self-piercing rivet nut for thin plates according to claim 1, characterized in that: The rivet ring (4) is arranged around the center hole on the end surface of the nut body (7); and the inner bottom of the rivet ring (4) overlaps with the center hole of the nut body (7).

9. The circular self-piercing rivet nut for thin plates according to claim 1, characterized in that: The rivet ring (4) is an annular inverted cone hole boss, the inverted cone hole boss is composed of an inclined surface and a circular ring, and the inner and outer sides of the circular ring respectively have the inclined surfaces inclined toward the outside of the nut body (7).

10. The circular self-piercing rivet nut for thin plates according to claim 1, characterized in that: The rivet ring (4) gradually becomes thinner from the bottom to the top.

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