A self-punching riveting fastener

Abstract

This utility model discloses a self-punching riveting fastener, including a riveting part, a contour part, and a free end. By providing a concave-convex structure on the contour part, wherein the concave-convex structure is any one of the following: concave-convex point, raised concave point, concave-convex point, and a combination of raised concave point and raised concave point, when the self-punching riveting fastener of this utility model is used to connect with other parts, the concave-convex structure of the contour part fits more closely with the parts to be connected, and the fitting gap is smaller, which is equivalent to increasing the contact area of ​​the force-bearing part, strengthening friction, effectively improving the fastener's resistance to torsion, and the concave-convex fitting method reduces the risk of slippage.

Description

Technical Field

[0001] This utility model relates to the field of connector technology, and in particular to a self-punching riveting fastener. Background Technology

[0002] Fasteners are commonly used to connect and secure two or more components, forming a stable mechanical structure. This connection is typically achieved through mechanical forces (such as friction, interlocking mechanisms, and elastic deformation). Various types of fasteners can be found in all kinds of machinery, roads, bridges, and structural buildings. In self-punching riveting, the pressure applied by a riveting tool allows the specific structure of the fastener to penetrate thicker materials, punching a hole that matches the shape of the fastener, thus completing the riveting process.

[0003] See the appendix to the specification of GB / T 12615.1-2004, "Closed-type flat round head blind rivets, grade 11," or the patent document with application number CN2022101368725. Figure 1 The invention discloses that existing traditional riveting fasteners consist of a top riveted portion, a middle contoured portion, and a lower free end. Because the middle contoured portion is a smooth arc surface, existing riveting fasteners generally suffer from insufficient torsional resistance, especially when the connector is subjected to alternating torque, easily leading to connection failure due to structural deformation. Furthermore, traditional rivets pose a risk of slippage or pull-out during riveting operations, primarily due to excessive clearance between the top riveted portion and the middle contoured surface, as well as material fatigue caused by uneven stress distribution during the riveting process. Utility Model Content

[0004] To address the problems of poor torsional resistance and the risk of slippage and pull-out during riveting of existing riveting fasteners, this invention provides a self-punching riveting fastener with strong torsional resistance and resistance to slippage and pull-out.

[0005] The technical solution of this utility model is as follows:

[0006] This utility model discloses a self-punching riveting fastener, including a riveting part, a contour part, and a free end. The contour part is provided with a concave-convex structure, which is any one of the following: a concave-convex point, a raised concave point, a concave-convex point, and a combination of raised concave points.

[0007] Furthermore, the recessed cavity includes an inverted conical groove and a protrusion, with the protrusion located within the inverted conical groove.

[0008] Furthermore, the protrusion and concave point include an arc-shaped protrusion or a rectangular protrusion and a concave point, wherein the concave point is disposed within the arc-shaped protrusion or the rectangular protrusion.

[0009] Furthermore, the concave-convex points and convex-concave points are distributed intersectingly on the contour portion.

[0010] Furthermore, the contour portion is provided with at least two support surfaces, both of which are inclined surfaces.

[0011] Furthermore, the top edge of the riveted part is provided with an end face, forming a chamfer-free cutting edge.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: by providing a concave-convex structure on the contour part, wherein the concave-convex structure is any one of the concave-convex point, the raised concave point, the concave-convex point and the raised concave point combination, when the self-punching riveting fastener of this utility model is used to connect with other parts, the concave-convex structure of the contour part fits more closely with the parts to be connected, and the fitting gap is smaller, which is equivalent to increasing the contact area of ​​the force-bearing, strengthening the friction, effectively improving the fastener's resistance to torsion, and the concave-convex fitting method reduces the risk of slippage. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of the first structure in Example 1;

[0014] Figure 2 This is a top view of the first structure in Example 1;

[0015] Figure 3 This is a cross-sectional structural diagram of the first structure in Example 1;

[0016] Figure 4 for Figure 3 A magnified structural diagram of part A in the middle;

[0017] Figure 5 This is a schematic diagram of the overall structure of the second structure in Example 1;

[0018] Figure 6 This is a top view of the second structure in Example 1;

[0019] Figure 7 This is a cross-sectional structural diagram of the second structure in Example 2;

[0020] Figure 8 This is a schematic diagram of the overall structure of the first structure in Example 2;

[0021] Figure 9 This is a top view of the first structure in Example 2;

[0022] Figure 10 This is a cross-sectional structural diagram of the first structure in Example 2;

[0023] Figure 11This is a schematic diagram of the overall structure of the second structure in Example 2;

[0024] Figure 12 This is a top view of the second structure in Example 2;

[0025] Figure 13 This is a cross-sectional structural diagram of the second structure in Example 2;

[0026] Figure 14 This is a schematic diagram of the overall structure of the first structure in Example 3;

[0027] Figure 15 This is a top view of the first structure in Example 3;

[0028] Figure 16 This is a schematic diagram of the overall structure of the second structure in Example 3;

[0029] Figure 17 This is a top view of the second structure in Example 3;

[0030] Figure 18 This is a schematic diagram of the structure of the self-punching riveting fastener of this utility model before it is connected to the sheet metal.

[0031] Figure 19 This is a structural diagram of the self-punching riveting fastener and sheet metal connection of this utility model;

[0032] Figure 20 This is a schematic diagram of the structure of the self-punching riveting fastener of this utility model after it is connected to the sheet metal.

[0033] Reference numerals: 1. Riveting part, 11. End face, 2. Contour part, 3. Free end, 4. Concave-convex structure, 41. Concave-convex point, 411. Inverted conical groove, 412. Protrusion, 42. Protrusion-concave point, 421. Arc-shaped protrusion, 422. Rectangular protrusion, 423. Concave point, 5. Support surface, 51. Front support surface, 52. Middle support surface, 53. Rear support surface, 6. Sheet metal, 7. Mold. Detailed Implementation

[0034] Now refer to the attached diagram, Figure 1Self-piercing riveting fasteners for connection with other parts are depicted. During installation onto a metal panel, they are riveted and attached to pre-drilled holes formed in the metal panel. That is, self-piercing riveting fasteners can be both self-piercing and self-riveting fasteners, piercing holes in the metal panel and riveting themselves to the metal panel during installation. It should be noted that although the illustrated embodiment is a bolt, other nuts, screws, studs, self-piercing and self-riveting fasteners, such as, for example, self-piercing and / or self-riveting studs, are within the scope of this invention. For brevity, most of the following description will refer to self-piercing rivets. It should be understood that this disclosure also applies to self-piercing and / or self-riveting studs.

[0035] Please refer to Figure 1 , Figure 8 and Figure 14 This utility model provides a self-punching riveting fastener, including a riveting part 1, a contour part 2, and a free end 3. The riveting part 1 extends from one end of the contour part 2 and is cylindrical. The free end 3 extends from the other end of the contour part 2. A central axis "X" is drawn on the fastener. The riveting part 1, the contour part 2, and the free end 3 are coaxial with the central axis "X". The surface of the free end 3 may be provided with threads, and the threads extend from a layer away from the contour part 2.

[0036] Example 1

[0037] Reference Figure 1 , Figure 2 , Figure 5 and Figure 6 The contour portion 2 is provided with a plurality of concave and convex structures 4, which are equally spaced around the riveting portion 1. Alternatively, the plurality of concave and convex structures 4 may be spaced apart from each other at unequal intervals around the riveting portion 1.

[0038] The concave-convex structure 4 is a recessed cavity with a protrusion 41. The recessed cavity with a protrusion 41 includes an inverted conical groove 411 and a protrusion 412, with the protrusion 412 disposed within the inverted conical groove 411. (Refer to...) Figure 2 The top view of the inverted conical groove 411 is a semi-elliptical shape, as shown in the reference. Figure 6 The top view of the inverted conical groove 411 is three-quarters of a circle. Alternatively, the top view of the inverted conical groove 411 can also be a polygon such as a square, pentagon, or hexagon, and can have different shapes. In addition, the protrusion 412 is pre-set with a punch. When the fastener is connected to other parts, compared with the smooth arc surface of the contour portion 2, the concave-convex structure 4 has a more closely fitted concave-convex part 41 to the connected part, with a smaller fitting gap, which is equivalent to increasing the contact area of ​​the force-bearing, strengthening friction, effectively improving the fastener's resistance to torsion, and the concave-convex fit reduces the risk of slippage.

[0039] Reference Figure 4 The contour portion 2 is further provided with three support surfaces 5, which extend from the contour portion 2 toward the free end 3. Each support surface 5 is an inclined surface. The three support surfaces 5 are a front support surface 51, a middle support surface 52, and a rear support surface 53. A parallel line b1 / b2 / b3 is drawn below each of the three support surfaces 5. It can be seen that the three support surfaces 5 form different angles with the corresponding parallel lines. The rear support surface 53 is naturally formed as a forged chamfer. During the fastener casting process, the three support surfaces 5 reduce local resistance. The front support surface 51 is relatively flat to reduce initial forming resistance, while the middle and rear support surfaces 52 gradually balance the material flow rate, increasing support stability, conforming to the material flow law, and constraining the initial elongation of the material to prevent cracking. When the fastener is connected to other components, because the single support surface 5 is divided into multiple continuous support surfaces 5, multiple contact points and contact areas are formed. Under torsion, the external torque can be distributed to multiple different locations, and the anti-rotation effect is significantly improved with the increase of the number of support points and support surfaces 5. Alternatively, the support surface 5 can be provided in two, four, or more segments.

[0040] Furthermore, referring to Figure 1 , Figure 3 , Figure 5 and Figure 7 The top edge of the riveting part 1 is provided with an end face 11, that is, the end face 11 is provided on the flange of the riveting part 1, forming a chamfered cutting edge, presenting a structure that is narrow at the top and wide at the bottom. In the process of riveting the fastener to the sheet metal, it can reduce the contact area between the fastener and the sheet metal, increase the pressure on the sheet metal, thereby achieving a greater self-piercing effect.

[0041] The riveting process of this self-punching riveting fastener is now described with reference to the attached drawings, as follows:

[0042] Before riveting, such as Figure 18 Sheet metal 6 has a disc-shaped structure and is located below the riveting part 1. The self-punching riveting fastener is vertically located at the upper end of sheet metal 6. The cutting edge has not yet started to cut sheet metal 6. The self-punching riveting fastener, sheet metal 6, and mold 7 are located on the same straight line.

[0043] During the riveting process, such as Figure 19The top edge of the riveting part 1 has an end face 11, which forms a chamferless cutting edge and supports the contact surface of the sheet metal 6. It gradually rivets and presses downwards. Under the action of force F, the sheet metal 6 gradually deforms and undergoes plastic deformation. The riveting part 1 gradually cuts the sheet metal 6 along the direction of force. The end faces 11 on both sides of the riveting part 1 deform. The sheet metal 6 is cut by the chamferless cutting edge along the straight cutting edge shape. As the self-punching riveting fastener continues to apply force, the force F increases and continues to act. The riveting part 1 gradually bends and deforms in all directions, causing the sheet metal 6 to deform. Specifically, the sheet metal 6 gradually bends and deforms synchronously with the riveting part 1.

[0044] After riveting, as Figure 20 As the riveting part 1 undergoes plastic deformation, it becomes approximately spherical inside the mold 7. The sheet metal 6 undergoes plastic deformation as the riveting is performed. Then, under the shaping and orientation effect of the mold 7, the sheet metal 6 closely adheres to the riveting part 1, which has already undergone plastic deformation.

[0045] Example 2

[0046] The difference from Embodiment 1 is that the concave-convex structure 4 is a raised concave point 42, as shown in the figure. Figures 8-10 The raised and recessed points 42 include a rectangular raised point 422 and a recessed point 423, wherein the recessed point 423 is disposed within the rectangular raised point 422. (Refer to...) Figures 11-13 The raised and recessed points 42 include an arc-shaped raised point 421 and a recessed point 423, with the recessed point 423 located within the arc-shaped raised point 421. Furthermore, the recessed point 423 is pre-set using a punch.

[0047] With the side closest to the central axis "X" as the inside, both the rectangular protrusion 422 and the arc-shaped protrusion 421 are anti-rotation features with the inside being lower and the outside being higher.

[0048] When the fastener is connected to other components, the concave-convex part 41 of the concave-convex structure 4 fits the connected part better than the smooth arc surface of the concave-convex part 2, with a smaller fitting gap, which is equivalent to increasing the contact area of ​​the force-bearing part, strengthening friction, effectively improving the fastener's resistance to torsion, and the concave-convex fit reduces the risk of slippage.

[0049] Example 3

[0050] The concave-convex structure 4 is a combination of concave protrusions 41 and convex concave points 42, and the concave protrusions 41 and convex concave points 42 are distributed intersectingly on the contour portion 2, as shown in the reference. Figure 15 The concave protrusion 41, viewed from above, is a semi-elliptical shape. The raised concave point 42 consists of rectangular protrusions 422 and concave points 423. The concave protrusion 41 and raised concave point 42 are evenly spaced around the contour portion 2. (Refer to...) Figure 17The concave protrusion 41 has a three-quarter circle structure when viewed from above, and the protruding concave point 42 consists of an arc-shaped protrusion 421 and a concave point 423. The concave protrusion 41 and the protruding concave point 42 are arranged at equal intervals around the contour part 2.

[0051] Compared with Embodiments 1 and 2, the concave-convex design is more obvious. When the fastener is connected to other components, the concave-convex structure 4 has a more closely fitted concave-convex part 41 to the connected part compared with the smooth arc surface of the concave-convex part 2. The fitting gap is smaller, which is equivalent to further increasing the contact area of ​​the force-bearing, strengthening the friction, effectively improving the fastener's resistance to torsion, and the concave-convex fitting method reduces the risk of slippage.

[0052] In summary, with improved torsional resistance, fasteners are less prone to connection failure due to structural deformation when subjected to alternating torque. At the same time, the risk of slippage or pull-out is reduced during riveting operations, and the stress distribution is uniform during riveting, preventing material fatigue.

[0053] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A self-punching riveting fastener, comprising a riveting portion (1), a contour portion (2), and a free end (3), characterized in that, The contour portion (2) is provided with a concave-convex structure (4), which is any one of the following combinations: concave protrusion (41), protruding concave point (42), concave protrusion (41) and protruding concave point (42).

2. The self-punching riveting fastener according to claim 1, characterized in that, The recessed protrusion (41) includes an inverted conical groove (411) and a protrusion (412), wherein the protrusion (412) is disposed within the inverted conical groove (411).

3. The self-punching riveting fastener according to claim 1, characterized in that, The protrusion and concave point (42) includes an arc-shaped protrusion (421) or a rectangular protrusion (422) and a concave point (423), wherein the concave point (423) is located within the arc-shaped protrusion (421) or the rectangular protrusion (422).

4. The self-punching riveting fastener according to claim 1, characterized in that, The concave protrusions (41) and convex concave points (42) are distributed in a cross pattern on the contour portion (2).

5. The self-punching riveting fastener according to claim 1, characterized in that, The contour portion (2) is also provided with at least two support surfaces (5), both of which are inclined surfaces.

6. The self-punching riveting fastener according to claim 1, characterized in that, The top edge of the riveting part (1) is provided with an end face (11) to form a chamfer-free cutting edge.

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