Fastener, fastening assembly and pressing rivet die

Abstract

The utility model discloses a fastener, a fastening assembly and a pressure riveting die, the fastener comprises a body and a boss, and the body is provided with a first surface used for supporting a metal plate. The boss protrudes out of the first face, the size of the boss is smaller than that of the body, the boss is provided with the first flower teeth connected with the first face, and due to the fact that the first flower teeth are provided with the multiple tooth parts, sheet metal materials flow into gaps of the adjacent tooth parts, and the torsion resistance capacity when the fastener is connected with the sheet metal can be improved. And if the diameter of the first flower tooth is gradually reduced in the direction towards the first surface, the first flower tooth and the first surface or other surfaces form an inverted taper ear-shaped flower tooth groove, so that the connection reliability and stability are improved, and the tensile capacity of the product can be improved. The boss is further provided with the first groove which is concave inwards, compared with a drum type, the boss is not prone to slipping off, the material containing space of a product can be increased, the connecting strength of materials such as light alloy with low shear capacity after riveting is improved, and the tensile capacity of the product is improved.

Description

Technical Field

[0001] This utility model relates to the field of connectors, specifically to a fastener, fastening assembly, and riveting die. Background Technology

[0002] Fasteners are a wide range of mechanical parts used for fastening connections. Various types of fasteners can be found on all kinds of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters, and supplies. They involve multiple fields such as materials science, mechanical engineering, and manufacturing processes. The trend towards lightweighting in the automotive industry has driven innovation in vehicle body fastening technology. Press-fit nuts, as a new type of fastener, are used on thin plates or sheet metal. They have changed the traditional method of installing parts on thin plates, improving installation efficiency and connection reliability, and meeting the needs of multiple fields such as household appliances, aerospace manufacturing, and automotive lightweighting. The working principle of press-fit nuts is based on the cold deformation characteristics of materials. Pressure is used to press the nut's unique knurled teeth and groove design into the thin plate material in one go, forming a stable connection point. With the rapid development of modern industry, especially in aerospace, automotive manufacturing, and electronics, the demand for fasteners is increasing. As an advanced connection technology, the market demand for press-fit nuts continues to expand. However, existing press-fit nuts suffer from insufficient pull-out resistance and poor torsional strength, making them difficult to use. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned defects or problems in the background art and to provide a fastener, fastening component and riveting mold.

[0004] To achieve the above objectives, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0005] Option 1, a fastener, including

[0006] The main body has a first surface;

[0007] A boss protrudes from the first surface, and the size of the boss is smaller than the size of the body. It has a first tooth that connects to the first surface, and the diameter of the first tooth gradually decreases in the direction toward the first surface and / or the boss also has a first groove that is recessed inward.

[0008] Option 2, based on Option 1, the boss includes a first boss and a second boss. The first boss protrudes from the first surface and is provided with the first tooth pattern, the diameter of which gradually decreases in the direction toward the first surface. The second boss protrudes from the top surface of the first boss and is smaller than the size of the first boss. The second boss is provided with a first groove that is recessed inward and extends to the top surface of the first boss.

[0009] Option 3, based on Option 2, further includes a second toothed protrusion. The second toothed protrusion extends vertically and its bottom end is connected to the top end of the first groove.

[0010] Option 4, based on Option 3, has the apex angle of the first tooth and / or the apex angle of the second tooth being 85-95°.

[0011] Option 5, based on Option 3, further includes a second groove on the first boss, which opens onto the top surface of the first boss and communicates with the first groove.

[0012] Option 6, based on Option 1, further includes a reinforcing rib, which protrudes from the first surface and extends radially along the body to connect with the first tooth pattern, the height of the reinforcing rib being lower than the height of the first tooth pattern.

[0013] Option 7, based on Option 6, wherein the width of the reinforcing rib gradually decreases or gradually increases along the direction close to the first surface 11).

[0014] Option 8, a fastening assembly, includes sheet metal riveted together and a fastener as described in any one of Options 1 to 7, wherein the sheet metal abuts against the first surface, and the material of the sheet metal is engaged with the first tooth, or the material of the sheet metal is engaged with the first tooth and the first groove.

[0015] Option 9, based on Option 8, further includes the sheet metal abutting against the top surface of the boss.

[0016] Option 10, a riveting die, suitable for riveting sheet metal and a fastener as described in any one of Options 1 to 7 into one piece, wherein the sheet metal is provided with a through hole, the boss is interference-fitted with the through hole, and the boss is provided with a positioning hole;

[0017] The riveting die includes an upper die, a lower die, a locating pin, and an elastic element;

[0018] The upper mold is adapted to accommodate the fastener and to face the lower mold with the boss facing the lower mold;

[0019] The lower mold is adapted to support the sheet metal;

[0020] The positioning pin is adapted to pass through the through hole and be positioned and engaged with the positioning hole, the positioning pin is adapted to support the top surface of the boss and have a first gap with the top surface of the boss;

[0021] The two ends of the elastic element act on the locating pin and the lower mold respectively, and are adapted to apply a force toward the fastener to the locating pin;

[0022] The upper die is adapted to move toward the lower die so that the boss presses against the sheet metal, causing the material of the sheet metal to flow into the first tooth and the first gap, or the material of the sheet metal to flow into the first tooth, the first gap and the first groove.

[0023] As can be seen from the above description of the present invention and its preferred embodiments, compared with the prior art, the technical solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0024] 1. In Scheme 1 and its preferred embodiments, a fastener includes a body and a boss.

[0025] The main body has a first surface for supporting sheet metal.

[0026] The boss protrudes from the first surface, and its size is smaller than that of the body. The boss has a first tooth pattern. Because the first tooth pattern has several teeth, the sheet metal material flows into the gaps between adjacent teeth, which can improve the torsional resistance when the fastener is connected to the sheet metal. If the diameter of the first tooth pattern gradually decreases in the direction towards the first surface to form an inverted conical ear-shaped tooth groove with the first surface or other surfaces, it is beneficial to guide the flow of material, especially non-metallic materials and high elastic modulus metal materials (such as aluminum alloys) under extrusion deformation, increasing the reliability and stability of the connection. Furthermore, since the sheet metal material is limited by the first tooth pattern and the first surface after flowing in, the tensile strength of the product can be improved.

[0027] In the existing technology ( Figure 18 The boss's sidewall bulges outward, forming a drum shape (caused by outward plastic deformation during the cold forging and extrusion process of carbon steel). After riveting, the sheet metal is prone to slipping along the drum-shaped sidewall. In this solution, the boss also has an inwardly recessed first groove, which makes it less prone to slippage compared to the drum shape. It also increases the material holding space of the product, improves the connection strength of materials with low shear resistance, such as lightweight alloys, after riveting, and enhances the tensile strength of the product.

[0028] If a fastener exhibits both of the above characteristics, its tensile strength is significantly improved.

[0029] 2. In Scheme 2 and its preferred embodiments, the boss includes a first boss and a second boss. The first boss protrudes from a first surface and has a first tooth pattern, the diameter of which gradually decreases along the direction towards the first surface. The second boss protrudes from the top surface of the first boss, and the size of the second boss is smaller than that of the first boss. The second boss has an inwardly recessed first groove, which forms an inwardly concave conical ear-shaped groove with the top surface or other surfaces of the first boss to increase the material holding space of the product during riveting. The first boss and the second boss are stepped so that the sheet metal material can flow into the first boss first and then into the second boss, ensuring uniform material flow.

[0030] 3. In Scheme 3 and its preferred embodiments, the first boss is further provided with a second tooth. The second tooth extends in the vertical direction and the bottom end of the second tooth is connected to the top end of the first groove, which improves the anti-torsion performance after riveting, maximizes the use of the space of the fastener, and plays a multiple anti-torsion role.

[0031] 4. In Scheme 4 and its preferred embodiments: The apex angle of the first riveting tooth is 85-95°. Specifically, if this apex angle is too large, the sheet metal is prone to slippage, weakening the torsional resistance; if this apex angle is too small, the riveting tooth is prone to crushing, leading to a sharp decrease in torsional resistance. This is especially true for lightweight alloys, which are prone to slippage, and high-strength and ultra-high-strength plates, which are prone to crushing the riveting tooth. This special angle design balances the torsional resistance after riveting (ensuring the largest possible contact area between the riveting tooth side and the sheet metal) and the compressive resistance during riveting (preventing the riveting tooth from crushing, which would lead to a sharp decrease in torsional resistance). The apex angle of the second riveting tooth is 85-95°, which balances the torsional resistance after riveting (ensuring the largest possible contact area between the riveting tooth side and the sheet metal) and the compressive resistance during riveting (preventing the riveting tooth from crushing, which would lead to a sharp decrease in torsional resistance).

[0032] 5. In Scheme 5 and its preferred embodiments: the first boss is further provided with a second groove, the second groove opening on the top surface of the first boss and communicating with the bottom end of the first groove, so as to further increase the material holding space of the product and improve the connection strength.

[0033] 6. In Scheme Six and its preferred embodiments: The reinforcing rib protrudes from the first surface, improving the torsional resistance after riveting, maximizing the use of the nut space, and providing multiple anti-torsion functions. Lightweight alloys and other materials have low shear resistance; therefore, multiple anti-torsion designs are used to meet the high-strength and high-stability connection requirements of special materials. The reinforcing rib extends radially along the body to connect with the first tooth. The height of the reinforcing rib is lower than the height of the first tooth, so that as the diameter of the first tooth gradually decreases in the direction towards the first surface, it forms an inverted conical ear-shaped tooth groove with the first tooth.

[0034] 7. In Scheme 7 and its preferred embodiments: the width of the reinforcing rib gradually decreases or increases along the direction close to the first surface. The width of the reinforcing rib gradually decreases along the direction close to the first surface, which can improve the anti-detachment property. Meanwhile, the width of the anti-rotation tooth gradually increases along the direction close to the first surface, which can facilitate the guidance of the sheet metal material to flow towards the first surface.

[0035] 8. In Scheme 8 and its preferred embodiments: a fastening component includes sheet metal riveted together and the above-mentioned fastener, the sheet metal abutting against a first surface, the material of the sheet metal engaging with the first tooth, or the material of the sheet metal engaging with the first tooth and the first groove, having the beneficial effects brought about by the above-mentioned fastener.

[0036] 9. In Scheme 9 and its preferred embodiments, the sheet metal also abuts against the top surface of the boss to increase the pull-out performance.

[0037] 10. In Scheme 10 and its preferred embodiments, a riveting die is provided, which is suitable for riveting sheet metal and the aforementioned fasteners into one piece. The sheet metal is provided with a through hole, and the boss is interference-fitted with the through hole. The boss is provided with a positioning hole. The riveting die includes an upper die, a lower die, a positioning pin, and an elastic element. The upper die is suitable for accommodating the fastener and positioning the boss towards the lower die. The lower die is suitable for supporting the sheet metal. The positioning pin is suitable for penetrating the through hole and positioning it with the positioning hole. The positioning pin is suitable for supporting the top surface of the boss and has a first gap with the top surface of the boss. The two ends of the elastic element act on the positioning pin and the lower die respectively, and are suitable for applying a force towards the fastener to the positioning pin. The upper die is suitable for moving towards the lower die so that the boss squeezes the sheet metal, so that the material of the sheet metal flows into the first tooth and the first gap, or the material of the sheet metal flows into the first tooth, the first gap, and the first groove, thereby solving the problem that the fastener is difficult to position when the boss and the through hole are interference-fitted to increase the connection strength after riveting, and eliminating appearance defects such as burrs and sheet metal imprints after riveting. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a perspective view of the fastener in Example 1;

[0040] Figure 2 This is a top view of the fastener in Example 1;

[0041] Figure 3 for Figure 2 Cross-sectional view of the AA section line;

[0042] Figure 4 for Figure 3 Enlarged view of the marked area;

[0043] Figure 5 This is a schematic diagram of the apex angles of the first and second flower teeth in Example 1;

[0044] Figure 6 This is a schematic diagram of the riveting die before riveting in Example 1;

[0045] Figure 7 This is a schematic diagram of the riveting process using the riveting die in Example 1;

[0046] Figure 8 This is a schematic diagram of the riveting structure completed by the riveting die in Example 1;

[0047] Figure 9 for Figure 8 Enlarged view of the marked area;

[0048] Figure 10 This is a perspective view of the fastener in Example 2;

[0049] Figure 11 This is a schematic diagram of the fastener structure in Example 2;

[0050] Figure 12 This is a perspective view of the fastener in Example 3;

[0051] Figure 13 This is a schematic diagram of the fastener structure in Example 3;

[0052] Figure 14 This is a perspective view of the fastener in Example 4;

[0053] Figure 15 This is a schematic diagram of the fastener structure in Example 4;

[0054] Figure 16 This is a perspective view of the fastener in Example 5;

[0055] Figure 17 This is a schematic diagram of the fastener structure in Example 5;

[0056] Figure 18 This is a schematic diagram of a drum-shaped boss in the prior art.

[0057] Explanation of key figure labels:

[0058] Body 1; First surface 11; Boss 2; Positioning hole 21; First boss 22; First tooth 221; Second groove 222; Second boss 23; Second tooth 231; First groove 232; Reinforcing rib 3; Upper mold 4; Receiving groove 41; Lower mold 5; Base 51; First lower mold inner hole 511; Second lower mold inner hole 512; Limiting surface 5121; Plug 52; Positioning pin 6; First guide cone angle 61; First step 62; Second guide cone angle 63; Second step 64; Third step 65; Fourth step 66; Elastic element 7; First gap 8; Sheet metal 9; Through hole 91; Detailed Implementation

[0059] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0060] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0061] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing this utility model and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0062] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0063] In the claims, description and accompanying drawings of this utility model, the terms "comprising," "having," and variations thereof are used to mean "including but not limited to."

[0064] Example 1:

[0065] refer to Figures 1-9 A fastener includes a body 1, a boss 2, and a reinforcing rib 3. This fastener can be either a bolt or a nut. This embodiment uses a nut as an example.

[0066] refer to Figure 1 In this embodiment, the body 1 is a cylinder with an outer diameter of 19.85-20.15 mm and a thickness of 7.6 mm-7.8 mm. In other embodiments, the shape of the body 1 is not limited and can also be hexagonal, octagonal, polygonal, etc. The body 1 is provided with a first surface 11, which is the top surface of the body 1 and is suitable for supporting the sheet metal 9.

[0067] refer to Figure 1 The boss 2 protrudes from the first surface 11, and the size of the boss 2 is smaller than the size of the body 1. The boss 2 is provided with a positioning hole 21, which passes through the fastener in the vertical direction and is in the form of a threaded hole to achieve threaded connection with other parts. Its specification is M12*1.5.

[0068] refer to Figure 1 The boss 2 includes a first boss 22 and a second boss 23. The first boss 22 protrudes from the first surface 11, as shown in the reference. Figure 4 The first boss 22 is provided with a first tooth 221 and a second groove 222. The first tooth 221 is connected to the first surface 11, and the diameter of the first tooth 221 gradually decreases along the direction towards the first surface 11. This further improves the tensile strength after riveting. Specifically, in this embodiment, the outer diameter of the first tooth 221 is 16.8-17.2 mm, the height is 0.6-0.9 mm, the apex angle is 85-95°, and it forms an angle of 3°-8° with the first surface 11. The second groove 222 opens on the top surface of the first boss 22. The portion of the second groove 222 closest to the axis of the boss 22 is the deepest, and the depth gradually decreases along the direction away from the axis of the boss 2 and close to the top surface of the first boss 22.

[0069] refer to Figure 4The second boss 23 protrudes from the top surface of the first boss 22. The size of the second boss 23 is smaller than that of the first boss 22. The second boss 23 has a second tooth 231 and an inwardly recessed first groove 232. The line connecting the top and bottom of the first groove 232 is defined as the first line segment. The inward recess means that the bottom of the first groove 232 is located on the side of the first line segment closer to the central axis of the boss 22. The first groove 232 has an inwardly concave fillet of approximately R2.6-R2.8mm. The first groove 232 extends to the top surface of the first boss 22 and forms an inwardly concave inverted conical ear-shaped groove with the top surface of the first boss 22 to increase the material holding space of the product during riveting. The bottom end of the first groove 232 is connected to the second groove 222 to further increase the material holding capacity. The second tooth 231 extends vertically (its diameter does not change in the vertical direction), with an outer diameter of 15.8-15.95mm and a height of 1.5-1.7mm. The bottom end of the second tooth 231 is connected to the top end of the first groove 232. To balance the torsional resistance after riveting, and to maximize the contact area between the side of the tooth and the sheet metal 9, as well as the compressive strength during riveting, to prevent the tooth from crushing and causing a sharp decrease in torsional resistance, refer to... Figure 5 The apex angle of the first tooth 221 is 85-95°, and the apex angle of the second tooth 231 is 85-95°.

[0070] refer to Figure 1 The reinforcing rib 3 protrudes from the first surface 11 and extends radially along the body 1 to connect with the first perforated tooth 221. The height of the reinforcing rib 3 is lower than the height of the first perforated tooth 221, thus forming an inverted conical ear-shaped perforated groove with the first perforated tooth 221. In this embodiment, the width of the reinforcing rib 3 remains unchanged along the direction close to the first surface 11. However, in other embodiments, preferably, the width of the reinforcing rib 3 gradually decreases or gradually increases along the direction close to the first surface 11. In this embodiment, eight reinforcing ribs 3, each 1.10-1.30 mm wide and 0.30-0.50 mm high, are evenly distributed on the first surface 11. The number of reinforcing ribs 3 is not limited and can also be four, six, etc.

[0071] The aforementioned fasteners can be riveted to sheet metal 9 using a riveting die to form a fastening assembly.

[0072] For details, please refer to Figures 7-9 A riveting die suitable for riveting sheet metal 9 and navigation tree fasteners together.

[0073] refer to Figure 7 Sheet metal 9 is provided with a through hole 91, and the boss 2 is in an interference fit with the through hole 91. In this embodiment, the second boss 23 is in an interference fit with the through hole 91 first.

[0074] The riveting die includes an upper die 4, a lower die 5, a locating pin 6, and an elastic element 7.

[0075] refer to Figure 7 The upper mold 4 is suitable for accommodating fasteners and aligns the boss 2 with the lower mold 5. Specifically, the upper mold 4 is provided with a receiving groove 41. The inner diameter of the receiving groove 41 should be adapted to the body 1, and the inner diameter of the receiving groove 41 should be 0.05-0.20mm larger than the outer diameter of the body 1 to ensure that the nut can be easily inserted. The depth of the receiving groove 41 should be 0.05-0.3mm less than the thickness of the body 1 to ensure that after the nut is inserted, the nut will protrude from the upper mold 4. Otherwise, the nut will be obstructed by the upper mold 4, and the reinforcing rib 3 and the first tooth 221 will not be able to be fully riveted into the sheet metal 9.

[0076] The lower mold 5 is suitable for supporting the sheet metal 9. The lower mold 5 includes a base 51 and a screw plug 52. The base 51 has a first lower mold 5 inner hole and a second lower mold 5 inner hole. The second lower mold 5 inner hole is provided with a limiting surface 5121. The first lower mold 5 inner hole is used for the locating pin 6 to extend out. The first lower mold 5 inner hole has a depth of 9.95-10.05mm and an inner diameter of 15.73-15.76mm. The first lower mold 5 inner hole is connected to the second lower mold 5 inner hole with an inner diameter of 20.00-20.03mm and a length of 50-60mm. The bottom of the base 51 has an M24*3.0 internal thread with a length of 20-21mm. The screw plug 52 has an internal hexagonal wrench with a cross-side diameter of 6.02-6.14mm and a depth of 3.95-4.05mm, and an external screw plug 52 with a length of 11.90-12.10mm and an M24*3 thread.

[0077] The locating pin 6 is adapted to pass through the through hole 91 and be positioned in conjunction with the locating hole 21. The locating pin 6 is adapted to support the top surface of the boss 2 and has a first gap 8 between it and the top surface of the boss 2. The first guide cone angle 61 of the locating pin 6 is 135°-145°, which serves to guide the nut. The first guide cone angle 61 leads downward to a first step 62 with a height of 5.04-5.10 mm and an outer diameter of 10.50-10.53 mm. The outer diameter of the first step 62 is adapted to the locating hole 21 of the nut and should be smaller than the locating hole 21 of the nut. The first step 62 is connected to the second step 64 through the second guide cone angle 63 (the second guide cone angle 63 forms a first gap 8 between it and the top surface of the boss 2). The outer diameter of the second step 64 is adapted to the through hole 91 of the sheet metal 9 and should be smaller than the through hole 91 of the sheet metal 9. In this embodiment, the outer diameter of the second step 64 is 15.69-15.71 mm and the height is 14.91-14.95 mm. Connected downwards to the second step 64 is the third step 65, with a height of 9.9-1.1 mm and an outer diameter of 19.96-19.99 mm. The outer diameter of the third step 65 is adapted to the inner diameter of the first lower die 5 and should be 0.05-0.10 mm smaller than the inner diameter of the first lower die 5. Connected downwards to the third step 65 is the fourth step 66, with a height of 4.95-5.05 mm and an outer diameter of 4.97-5.00 mm.

[0078] The two ends of the elastic element 7 act on the positioning pin 6 and the screw plug 52 of the lower mold 5 respectively, and are adapted to apply a force toward the fastener to the positioning pin 6;

[0079] The upper mold 4 is adapted to move toward the lower mold 5 so that the boss 2 presses the sheet metal 9, so that the material of the sheet metal 9 and the material flowing into the sheet metal 9 flow into the first tooth 221, the first gap 8 and the first groove 232.

[0080] Specifically, the locating pin 6 passes through the inner holes of the first lower mold 5 and the second lower mold 5, and the third step 65 abuts against the limiting surface 5121 of the inner hole of the second lower mold 5. An elastic element 7 is fitted on the fourth step 66, and the other end of the elastic element 7 abuts against the screw plug 52. The amount of extension and retraction of the elastic element 7 can be adjusted by the screw plug 52 to fix the locating pin 6 to the lower mold 5.

[0081] A schematic diagram of the riveting process before riveting is shown below. Figure 6 As shown, the boss 2 of the nut abuts against the second guide cone angle 63, and the first step 62 passes through the positioning hole 21 of the nut, serving a positioning function. The upper mold 4 abuts against the end of the nut, and the through hole 91 of the sheet metal 9 fits into the second step 64.

[0082] The riveting process is as follows Figure 7 As shown, the upper mold 4 presses the nut downwards, and the nut is pressed into the sheet metal 9 along the locating pin 6. The locating pin 6 moves towards the screw plug 52 under the pressure of the nut until the first surface 11 on the body 1 is flush with the end face of the sheet metal 9, completing the riveting process. Figure 8 As shown. After riveting is completed, the locating pin 6 will spring back to its initial position due to the action of the elastic element 7, and the next riveting will continue. This solves the problem of difficult nut positioning.

[0083] like Figure 9 As shown, after riveting, the sheet metal 9 rests against the first surface 11. The sheet metal 9 material is fitted with the first tooth 221, the second tooth 231, the first groove 232, the second groove 222, and the reinforcing rib 3, and rests against the top surface of the boss 2. At this point, the friction generated by the interference fit between the first tooth 221, the second tooth 231, and the sheet metal 9, along with the first groove 232 and the first tooth 221, constitute a four-fold anti-pull-out structure, significantly improving the tensile strength.

[0084] The first tooth 221, the second tooth 231, and the reinforcing rib 3, after being riveted together, form a triple anti-torsion structure, which significantly improves the anti-torsion performance.

[0085] Example 2:

[0086] refer to Figure 10 , Figure 11 Unlike Embodiment 1, this embodiment does not have a second groove 222.

[0087] Example 3:

[0088] refer to Figure 12 , Figure 13Unlike embodiment two, this embodiment does not have reinforcing ribs 3.

[0089] Example 4:

[0090] refer to Figure 14 , Figure 15 Unlike Embodiment 2, this embodiment does not have a second floral tooth 231, and its first groove 232 can have a larger arrangement space.

[0091] Example 5:

[0092] refer to Figure 16 , Figure 17 Unlike embodiment four, this embodiment does not have reinforcing rib 3.

[0093] Examples 2-5 can also be riveted together with sheet metal 9 using the above-mentioned riveting mold.

[0094] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A fastener, characterized in that: include The main body (1) has a first surface (11); A boss (2) protrudes from the first surface (11), and the size of the boss (2) is smaller than the size of the body (1). It is provided with a first tooth (221), the diameter of the first tooth (221) gradually decreases in the direction toward the first surface (11), and / or the boss (2) is also provided with an inwardly recessed first groove (232).

2. The fastener as described in claim 1, characterized in that: The boss (2) includes a first boss (22) and a second boss (23). The first boss (22) protrudes from the first surface (11) and is provided with the first tooth (221). The diameter of the first tooth (221) gradually decreases in the direction toward the first surface (11). The second boss (23) protrudes from the top surface of the first boss (22). The size of the second boss (23) is smaller than the size of the first boss (22). The second boss (23) is provided with an inwardly recessed first groove (232).

3. A fastener as described in claim 2, characterized in that: The first boss (22) is also provided with a second tooth (231), which extends in a vertical direction and the bottom end of the second tooth (231) is connected to the top end of the first groove (232).

4. A fastener as described in claim 3, characterized in that: The apex angle of the first tooth (221) and / or the apex angle of the second tooth (231) is 85-95°.

5. A fastener as described in claim 3, characterized in that: The first boss (22) is also provided with a second groove (222), which opens on the top surface of the first boss (22) and communicates with the bottom end of the first groove (232).

6. A fastener as described in claim 1, characterized in that: It also includes a reinforcing rib (3), which protrudes from the first surface (11) and extends radially along the body (1) to connect with the first tooth (221). The height of the reinforcing rib (3) is lower than the height of the first tooth (221).

7. A fastener as described in claim 6, characterized in that: The width of the reinforcing rib (3) gradually decreases or gradually increases along the direction close to the first surface (11).

8. A fastening assembly, characterized in that: Includes sheet metal (9) riveted together and a fastener as described in any one of claims 1-7, wherein the sheet metal (9) abuts against the first surface (11), and the material of the sheet metal (9) is fitted with the first tooth (221), or the material of the sheet metal (9) is fitted with the first tooth (221) and the first groove (232).

9. A fastening assembly as described in claim 8, characterized in that: The sheet metal (9) also abuts against the top surface of the boss (2).

10. A riveting die, characterized in that: It is suitable for riveting sheet metal (9) and a fastener as described in any one of claims 1-7 into one piece, wherein the sheet metal (9) is provided with a through hole (91), the boss (2) is interference-fitted with the through hole (91), and the boss (2) is provided with a positioning hole (21); The riveting die includes an upper die (4), a lower die (5), a locating pin (6), and an elastic element (7); The upper mold (4) is adapted to accommodate the fastener and to position the boss (2) toward the lower mold (5); The lower mold (5) is adapted to support the sheet metal (9); The positioning pin (6) is adapted to pass through the through hole (91) and be positioned in conjunction with the positioning hole (21). The positioning pin (6) is adapted to support the top surface of the boss (2) and has a first gap (8) between it and the top surface of the boss (2). The two ends of the elastic element (7) act on the positioning pin (6) and the lower mold (5) respectively, and are adapted to apply a force toward the fastener to the positioning pin (6); The upper mold (4) is adapted to move toward the lower mold (5) so that the boss (2) presses the sheet metal (9) so that the material of the sheet metal (9) flows into the first tooth (221) and the first gap (8), or the material of the sheet metal (9) flows into the first tooth (221), the first gap (8) and the first groove (232).

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