Self-locking rivet and equipment

Abstract

The self-locking rivet is riveted to a mounting part and comprises a riveting head part and a riveting section which are sequentially connected in the first direction, the riveting section comprises a riveting body and a plurality of tooth parts, and the tooth parts are arranged on the side portion of the riveting body in a protruding mode and distributed in the circumferential direction of the riveting body at intervals; each tooth part extends in the first direction, a groove is formed between every two adjacent tooth parts, the multiple tooth parts are used for being embedded into the installation part, a structure similar to a mortise and tenon joint is formed, and therefore the mechanical locking effect between the riveting section and the installation part is enhanced. The grooves are filled with part of the mounting parts, so that an interlocking effect exists between the filling parts and the grooves, the connecting strength between the self-locking rivet and the mounting parts is further enhanced, and the sealing performance of the connecting positions is improved due to the arrangement that the tooth parts are embedded into the mounting parts and the grooves are filled with part of the mounting parts; and liquid can be effectively prevented from permeating from the outside of the riveting head part to the joint of the mounting part and the riveting section.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a self-locking rivet and equipment. Background Art

[0002] In recent years, new energy electric vehicles have been increasingly favored by consumers, and driving range and safety issues have always been important factors influencing consumers' choice of new energy vehicles. The use of lightweight materials is an important way to achieve lightweighting of automobiles. Taking into account cost, safety, performance and lightweighting effects, multi-material hybrid body structures represented by steel-aluminum hybrid bodies using hot-formed steel and aluminum alloys will represent the development trend of lightweight automobile technology in the future. However, in order to fix the steel-aluminum hybrid body, the relevant technology usually adopts a method of pre-machining a prefabricated hole on the aluminum plate, then assembling a countersunk rivet into the prefabricated hole, and then using resistance spot welding to complete the welding of the rivet to the steel plate. However, the mating assembly of the countersunk rivet and the prefabricated hole results in a weak connection strength and poor sealing between the countersunk rivet and the aluminum plate. Utility Model Content

[0003] The embodiments of the present application provide a self-locking rivet and a device, which are intended to improve the connection strength and sealing between the self-locking rivet and the mounting portion.

[0004] To achieve the above objectives, according to a first aspect of the present application, a self-locking rivet is provided for riveting to a mounting portion. The self-locking rivet includes a riveting head and a riveting section connected sequentially along a first direction. The riveting section includes a riveting body and a plurality of teeth. The plurality of teeth are protruding from a side of the riveting body. The plurality of teeth are spaced apart along the circumference of the riveting body. Each tooth extends along the first direction, and a groove is formed between two adjacent teeth.

[0005] Wherein, the plurality of teeth are used to embed into the mounting portion and partially fill the groove with the mounting portion.

[0006] Optionally, along the axial direction away from the riveting section, the cross-sectional area of ​​the tooth portion is arranged to decrease.

[0007] Optionally, the tooth portion has two first side surfaces arranged opposite to each other along the circumference of the riveted body, and the riveted body has a second side surface extending along its circumference, and a first angle θ1 is formed between at least one of the two first side surfaces and the second side surface, wherein 95°≤θ1≤105°.

[0008] Optionally, along the axial direction away from the riveting section, the height of the tooth portion is H1, wherein 0.5 mm ≤ H1 ≤ 2 mm.

[0009] Optionally, the riveted body is cylindrical and extends along the first direction, and the diameter of the riveted body is D1, wherein 6mm≤D1≤16mm.

[0010] Optionally, along the direction from the riveting head to the riveting section, the draft angle of the tooth portion is θ2, wherein 1°≤θ2≤5°.

[0011] Optionally, an annular receiving groove is provided at the top of the riveting section adjacent to the riveting head, and the annular receiving groove is communicated with the groove;

[0012] Wherein, when the riveting section is riveted into the mounting portion, the deformed portion of the mounting portion is at least partially used to fill the groove and the annular receiving groove respectively.

[0013] Optionally, the annular accommodating groove is annular, and the diameter of the bottom of the annular accommodating groove is D2, wherein 5mm≤D2≤16mm.

[0014] Optionally, a boss is provided on the end surface of the riveted section facing away from the riveted head, and along the first direction, the orthographic projection of the boss is within the orthographic projection of the riveted section.

[0015] Optionally, along a direction perpendicular to the axis of the riveted body, the size of the boss is L1, wherein 3mm≤L1≤10mm; and / or,

[0016] Along the first direction, the height of the boss is H2, wherein 0.1 mm ≤ H2 ≤ 0.3 mm.

[0017] Optionally, the cross-sectional area of ​​the boss is arranged to decrease gradually along the direction from the riveted head to the riveted section.

[0018] Optionally, along a direction perpendicular to the axis of the riveted body, the dimension of the riveted head is L2, wherein 8 mm ≤ L2 ≤ 20 mm; and / or,

[0019] Along the first direction, the height of the riveted head is H3, wherein 1 mm ≤ H3 ≤ 3 mm.

[0020] Optionally, the outer surface of the self-locking rivet is provided with a coating.

[0021] According to a second aspect of the present application, a device is provided, comprising a mounting portion and the self-locking rivet as described above, wherein the self-locking rivet is riveted to the mounting portion, a plurality of the teeth are embedded in the mounting portion, and a portion of the mounting portion fills the groove.

[0022] In the self-locking rivet of the embodiment of the present application, the self-locking rivet is directly riveted to the mounting portion, so that the riveted section rivets through the mounting portion. There is no need to pre-set holes on the mounting portion, which reduces the hole-making process, improves the production cycle, and reduces production costs. The arrangement of the multiple teeth protruding from the riveted body and embedded in the mounting portion, on the one hand, forms a "mortise and tenon" structure between the teeth and the mounting portion, thereby enhancing the mechanical locking effect between the riveted section and the mounting portion. On the other hand, it increases the contact area between the riveted section and the mounting portion, so that there is a greater friction between the riveted section and the mounting portion, making it difficult for the riveted section to detach from the mounting portion. The groove formed between adjacent teeth will be partially filled with the material of the mounting portion during the riveting process, so that there is an interlocking effect between the filled portion and the groove, further enhancing the connection strength between the self-locking rivet and the mounting portion, and improving the anti-peeling ability between the riveted section and the mounting portion. In addition, due to the arrangement of multiple teeth embedded in the mounting portion, the teeth and the mounting portion are tightly connected, and part of the mounting portion fills the groove, which also makes the groove and part of the mounting portion tightly connected, which can effectively prevent liquid from penetrating from the outside of the riveted head to the connection between the mounting portion and the riveted section.

[0023] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0025] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0026] Figure 1 is a schematic structural diagram of a self-locking rivet provided in an exemplary embodiment of the present disclosure;

[0027] Figure 2 yes Figure 1 A bottom view of the self-locking rivet shown;

[0028] Figure 3 yes Figure 2 A local enlarged schematic diagram shown;

[0029] Figure 4 yes Figure 1 A front view of the self-locking rivet shown;

[0030] Figure 5is a schematic structural diagram of a self-locking rivet and a mounting portion riveted in an exemplary embodiment of the present disclosure;

[0031] Figure 6 is a structural schematic diagram of a self-locking rivet, a mounting portion, and a riveting device provided in an exemplary embodiment of the present disclosure;

[0032] Figure 7 yes Figure 6 A schematic diagram of the structure in which a self-locking rivet is anchored into a mounting portion by a riveting device;

[0033] Figure 8 Schematic diagram of the structure of the self-locking rivet, mounting portion and thermoforming connection provided in an exemplary embodiment of the present disclosure.

[0034] Description of reference numerals:

[0035] 10. Self-locking rivet, 1. Riveting head, 2. Riveting section, 21. Riveting body, 211. Second side, 22. Tooth, 221. First side, 23. Groove, 3. Annular receiving groove, 4. Boss, 20. Mounting portion, 30. Riveting upper die, 40. Riveting lower die, 50. Thermoformed plate, 60. Spot welding electrode head, 70. Weld core. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0037] This application provides a self-locking rivet, please refer to Figures 1 to 4 , Figure 1 is a schematic structural diagram of a self-locking rivet provided in an exemplary embodiment of the present disclosure, Figure 2 yes Figure 1 Bottom view of the self-locking rivet shown, Figure 3 yes Figure 2 The enlarged schematic diagram of the part A is shown. Figure 4 yes Figure 1 The self-locking rivet 10 is used for riveting to the mounting portion 20, and comprises a riveting head 1 and a riveting section 2 connected in sequence along a first direction.

[0038] It should be noted that the riveted head 1 abuts against the mounting portion 20 when the riveted section 2 is completely riveted into the mounting portion 20. In this way, the self-locking rivet 10 is prevented from being completely riveted into the mounting portion 20. This not only provides support during riveting, but also prevents the rivet from being excessively deformed or falling off when subjected to external force, thereby indirectly enhancing the stability of the connection.

[0039] The riveted section 2 includes a riveted body 21 and a plurality of teeth 22 . The plurality of teeth 22 are protruding from the side of the riveted body 21 . The plurality of teeth 22 are arranged at intervals along the circumference of the riveted body 21 . Each tooth 22 extends along the first direction, and a groove 23 is formed between two adjacent teeth 22 .

[0040] It should be noted that the spacing between two adjacent tooth portions 22 in the multiple tooth portions 22 can be the same or different. When the spacing between two adjacent tooth portions 22 in the multiple tooth portions 22 is different, the spacing between the multiple tooth portions 22 can be set to decrease or increase in the clockwise or counterclockwise direction. Specifically, this application does not limit this.

[0041] In addition, the shape of the tooth portion 22 can be various. For example, in one embodiment, along the axial direction of the riveted body 21, the cross-section of the tooth portion 22 can be triangular, square, trapezoidal, semicircular or diamond-shaped, etc. Specifically, the cross-section of the tooth portion 22 can be selected as needed, and this application does not limit this.

[0042] In the self-locking rivet 10 of the present embodiment, the self-locking rivet 10 is directly riveted to the mounting portion 20, so that the riveted section 2 is riveted through the mounting portion 20. There is no need to pre-drill a pre-set hole in the mounting portion 20, which reduces the hole-making process, improves production time, and reduces production costs. The multiple teeth 22 protruding from the riveted body 21 and embedded in the mounting portion 20 form a "mortise and tenon" structure between the teeth 22 and the mounting portion 20, thereby enhancing the mechanical locking effect between the riveted section 2 and the mounting portion 20. Furthermore, the contact area between the riveted section 2 and the mounting portion 20 is increased, resulting in greater friction between the riveted section 2 and the mounting portion 20, making it difficult for the riveted section 2 to separate from the mounting portion 20. During the riveting process, the grooves 23 formed between adjacent teeth 22 are partially filled with material from the mounting portion 20, creating an interlocking effect between the filled portion and the grooves 23, further enhancing the connection strength between the self-locking rivet 10 and the mounting portion 20 and improving the peel resistance between the riveted section 2 and the mounting portion 20. In addition, since the multiple teeth 22 are embedded in the mounting portion 20, the teeth 22 and the mounting portion 20 are tightly connected, and part of the mounting portion 20 is filled with the groove 23, which also makes the groove 23 and part of the mounting portion 20 tightly connected, which can effectively prevent liquid from penetrating from the outside of the riveted head 1 to the connection between the mounting portion 20 and the riveted section 2.

[0043] Reference Figure 2 and Figure 3In one embodiment, the cross-sectional area of ​​the teeth 22 decreases in a direction away from the axis of the riveted section 2. This design makes it easier for the teeth 22 to embed into the mounting portion 20 during the riveting process because the cross-sectional area of ​​the teeth 22 gradually decreases in the direction away from the riveted section 2. A larger cross-sectional area provides stronger mechanical locking force, while the gradually decreasing cross-sectional area helps distribute stress at the connection. Once the teeth 22 are fully embedded in the mounting portion 20, their cross-sectional area is larger near the riveted section 2 and gradually decreases in the direction away from the riveted section 2. This design improves the connection strength between the riveted section 2 and the mounting portion 20. The decreasing cross-sectional area design helps distribute stress at the connection between the riveted section 2 and the mounting portion 20. When subjected to external force, the larger cross-sectional area portion can withstand more stress, while the smaller cross-sectional area portion can gradually reduce the stress and distribute it to the surrounding material, thereby reducing the risk of damage to the riveted section 2 due to stress concentration at the connection between the riveted section 2 and the mounting portion 20.

[0044] Reference Figure 3 In one embodiment, the tooth portion 22 has two first side surfaces 221 disposed in opposite directions along the circumference of the rivet body 21. The rivet body 21 has a second side surface 211 extending along the circumference thereof. A first angle θ1 is formed between at least one of the two first side surfaces 221 and the second side surface 211, wherein 95°≤θ1≤105°. This provides a larger contact area between the tooth portion 22 and the mounting portion 20. The larger contact area results in greater friction between the tooth portion 22 and the mounting portion 20, thereby strengthening the connection between the rivet segment 2 and the mounting portion 20. The larger contact area enables the tooth portion 22 to be stably embedded in the mounting portion 20, resulting in a stronger mechanical locking force between the rivet segment 2 and the mounting portion 20. This locking force helps to resist impact and vibration of the connection between the rivet segment 2 and the mounting portion 20 caused by external loads, thereby improving the stability and reliability of the connection between the rivet segment 2 and the mounting portion 20.

[0045] It should be noted that the first angle θ1 can take a variety of values. For example, the first angle θ1 can be 95°, 96°, 97°, 98°, 99°, 100°, 101°, 102°, 103°, 104°, or 105°. Specifically, the value of the first angle θ1 can be selected as needed and is not limited in this application.

[0046] Reference Figure 3In some embodiments, the height of the teeth 22, facing away from the axis of the riveted segment 2, is H1, where 0.5 mm ≤ H1 ≤ 2 mm. Thus, when the height H1 of the teeth 22 is between 0.5 mm and 2 mm, sufficient shear resistance can be provided. Within this height range, the teeth 22 can more effectively disperse shear stress at the connection, reducing stress concentration, thereby improving the strength and stability of the connection between the riveted segment 2 and the mounting portion 20. When the height H1 of the teeth 22 is between 0.5 mm and 2 mm, the teeth 22 can be better embedded in the mounting portion 20, forming a tighter interlocking structure between the teeth 22 and the mounting portion 20. This structure helps resist impact and vibration at the connection between the teeth 22 and the mounting portion 20 caused by external loads, thereby enhancing the reliability of the connection. When the height H1 of the teeth 22 is between 0.5 mm and 2 mm, the teeth 22 are neither too large, resulting in material waste, nor too small, affecting the connection strength. During the riveting process, when the height H1 of the tooth portion 22 is between 0.5 mm and 2 mm, the tooth portion 22 can be more easily embedded in the mounting portion 20 , thereby reducing resistance and friction during the riveting process and improving riveting efficiency and accuracy.

[0047] It should be noted that the height of the tooth portion 22 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.8mm, 1.9mm or 2mm, etc. Specifically, the height of the tooth portion 22 can be selected as needed, and this application does not limit this.

[0048] In addition, the height of the teeth 22 can be adjusted accordingly based on the rivet body 21. For example, if the rivet body 21 is relatively large along the axis away from the rivet section 2, the teeth 22 can be appropriately enlarged, thereby reducing the manufacturing difficulty. If the rivet diameter is very small, the teeth 22 can be appropriately reduced.

[0049] Reference Figure 2 In some embodiments, the rivet body 21 is cylindrical and extends along the first direction. The diameter of the rivet body 21 is D1, where 6mm≤D1≤16mm. In this way, the cylindrical rivet body 21 can provide a stable connection interface and ensure that the riveted section 2 has sufficient strength and rigidity. The diameter D1 of the rivet body 21 is in the range of 6mm to 16mm, so that the rivet body 21 can effectively resist external loads such as shear and tension. The cylindrical structure of the rivet body 21 can provide better stress distribution, so that the connection between the rivet body 21 and the tooth portion 22 or the mounting portion 20 can better withstand long-term cyclic loads. The diameter D1 is in the range of 6mm to 16mm, which makes the cylindrical rivet body 21 easy to process and manufacture.

[0050] Furthermore, the diameter of the rivet body 21 ranges from 6mm to 16mm, taking into account factors such as mechanical properties, deformation, process feasibility, and lightweighting. If the diameter is less than 6mm, the weld nugget size after spot welding will be very small, failing to meet strength requirements. Furthermore, the small diameter of the rivet body 21 increases the difficulty of positioning the welding gun on the rivet body 21, making it difficult to ensure the stability of the welding process. If the diameter of the rivet body 21 is greater than 16mm, the self-locking rivet 10 will cause severe plastic deformation of the mounting portion 20 during the riveting process, making it impossible to control the dimensional accuracy of the mounting portion 20. Furthermore, a larger rivet body 21 will increase the weight of the vehicle body.

[0051] It should be noted that the diameter of the riveted body 21 can be: 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm or 16mm, etc. Specifically, the diameter of the riveted body 21 can be selected as needed, and this application does not limit this.

[0052] In one embodiment, the draft angle of the teeth 22 along the direction from the riveted head 1 to the riveted section 2 is θ2, where 1°≤θ2≤5°. This reduces friction and resistance between the mounting portion 20 and the teeth 22 when the mounting portion 20 partially fills the groove 23, facilitating the partial filling of the groove 23 by the mounting portion 20. By limiting the draft angle θ2 to between 1° and 5°, the demolding process of the self-locking rivet 10 is smoother, reducing damage to the teeth 22 during the demolding process. If the draft angle θ2 of the teeth 22 is greater than 5°, this will hinder the partial filling of the mounting portion 20 by squeezing it into the groove 23 during punch riveting.

[0053] It should be noted that the draft angle of the tooth portion 22 can be: 1°, 1.5°, 2°, 2.5°, 3°, 3.5°, 4°, 4.5° or 5°, etc. Specifically, the draft angle of the tooth portion 22 can be selected as needed, and this application does not limit this.

[0054] Reference Figure 1 and Figure 4In some embodiments, an annular receiving groove 3 is provided at the top of the riveted section 2 adjacent to the riveted head 1. The annular receiving groove 3 communicates with the groove 23. When the riveted section 2 is riveted into the mounting portion 20, the deformed portion of the mounting portion 20 at least partially fills the groove 23 and the annular receiving groove 3, respectively. This increases the contact area between the riveted section 2 and the mounting portion 20, thereby improving the strength and stability of the connection. The design of the annular receiving groove 3 and the groove 23 can increase the friction between the riveted section 2 and the mounting portion 20, thereby preventing the connection from loosening due to vibration or external forces during long-term use. When the mounting portion 20 deforms and fills the annular receiving groove 3 and the groove 23, a mechanical interlock is formed between the mounting portion 20 and the groove 23, and between the annular groove 23. This makes the connection between the riveted section 2 and the mounting portion 20 more secure and reliable, and ensures a good seal between the mounting portion 20 and the riveted section 2, preventing fluid from penetrating from the outside of the riveted head 1 into the connection between the mounting portion 20 and the riveted section 2. The design of the annular receiving groove 3 and the groove 23 can more effectively utilize the deformed portion of the mounting portion 20 for filling, so in actual application, there is no need to add additional material to enhance the connection strength.

[0055] Reference Figure 4 In one embodiment, the annular receiving groove 3 is annular, and the diameter of the bottom of the annular receiving groove 3 is D2, wherein 5mm≤D2≤16mm. Thus, the diameter D2 of the bottom of the annular receiving groove 3 is between 5mm and 16mm. This size range is neither too large to cause insufficient connection strength, nor too small to increase processing difficulty. Such a design can ensure the stability of the connection while ensuring the connection strength.

[0056] It should be noted that the diameter of the bottom of the annular accommodating groove 3 can be: 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm or 16mm, etc. Specifically, the diameter of the bottom of the annular accommodating groove 3 can be selected according to needs, and this application does not limit this.

[0057] Reference Figure 2 and Figure 4 In some embodiments, a boss 4 is provided on the end surface of the riveted segment 2 facing away from the riveted head 1. Along a first direction, the orthographic projection of the boss 4 lies within the orthographic projection of the riveted segment 2. This ensures that the cross-sectional area of ​​the boss 4 along the axial direction of the riveted segment 2 is smaller than that of the riveted segment 2. During the riveting process, the boss 4 encounters less resistance, guiding the riveted segment 2 smoothly into the mounting portion 20. The presence of the boss 4 can also compensate for metal loss caused by spot welding spatter.

[0058] Reference Figure 4In one embodiment, the size of the boss 4 along the direction perpendicular to the axis of the riveted body 21 is L1, wherein 3mm≤L1≤10mm. In this way, on the one hand, while ensuring that the boss 4 has sufficient strength, the riveting resistance is reduced as much as possible so that the boss 4 can be smoothly anchored in the mounting portion 20. On the other hand, ensuring the existence of the boss 4 can also compensate for the metal loss caused by spot welding spatter.

[0059] It should be noted that the radial size of the boss 4 along the riveted section 2 can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc. Specifically, the size of the boss 4 can be selected as needed, and this application does not limit this.

[0060] Reference Figure 4 In one embodiment, along the first direction, the height of the boss 4 is H2, wherein 0.1 mm ≤ H2 ≤ 0.3 mm. In this way, the existence of the boss 4 can also compensate for the metal loss caused by spot welding spatter.

[0061] It should be noted that, along the first direction, the height of the boss 4 can be: 0.1mm, 0.15mm, 0.18mm, 0.2mm, 0.22mm, 0.25mm, 0.29mm or 0.3mm, etc. Specifically, the height of the boss 4 along the first direction can be set as needed, and this application does not limit this.

[0062] After the self-locking rivet 10 is riveted to the mounting portion 20, refer to Figure 6 and Figure 7 The boss 4 protrudes from the rivet hole formed by the self-locking rivet 10 on the mounting portion 20, which is conducive to the formation of the subsequent spot welding nugget.

[0063] Reference Figure 1 and Figure 4 In one embodiment, the cross-sectional area of ​​the boss 4 decreases gradually from the riveted head 1 to the riveted segment 2. This design of the boss 4 facilitates smooth riveting of the riveted segment 2 even when the mounting portion 20 lacks a pre-set hole. The decreasing cross-sectional area of ​​the boss 4 helps reduce resistance during riveting of the boss 4 into the mounting portion 20.

[0064] Reference Figure 4In some embodiments, the dimension L2 of the rivet head 1 along a direction perpendicular to the axis of the rivet body 21 is 8 mm ≤ L2 ≤ 20 mm. Thus, the dimension L2 of the rivet head 1 is between 8 mm and 20 mm. This range ensures sufficient strength of the rivet head 1 while avoiding material waste and excessive weight of the self-locking rivet 10 caused by excessive size. The dimension range of the rivet head 1 is determined by comprehensively considering factors such as mechanical properties, deformation, process feasibility, and lightweighting. When the dimension of the rivet head 1 is less than 8 mm, the dimension of the rivet section 2 is correspondingly reduced, resulting in a very small nugget size after spot welding, which cannot meet the strength requirements. Furthermore, the excessively small rivet head 1 increases the difficulty of positioning the welding gun on the rivet head 1, making it difficult to ensure process stability. When the dimension of the rivet head 1 is greater than 20 mm, the dimension of the rivet section 2 is correspondingly increased, causing severe plastic deformation of the mounting portion 20 during the riveting process, making it impossible to control the dimensional accuracy of the mounting portion 20. When the size of the rivet head 1 is greater than 20 mm, the self-locking rivet 10 will be heavier. When the self-locking rivet 10 is installed on a vehicle body, the weight of the vehicle body will be greatly increased.

[0065] Continue to refer to Figure 4 In one embodiment, the height of the rivet head 1 along the first direction is H2, where 1mm ≤ H3 ≤ 3mm. This range prevents interference between the rivet head 1 and other parts, ensuring precise assembly. The rivet head 1 within this range can provide appropriate clamping force to ensure close contact between the self-locking rivet 10 and the mounting portion 20, thereby forming a good seal. This range also prevents upward warping during welding, improving product aesthetics and quality.

[0066] In addition, when the height of the rivet head 1 is greater than 3 mm, it may interfere with other parts, resulting in difficulty in assembly or failure to assemble correctly. When the height of the rivet head 1 is greater than 3 mm, it may protrude from the overall appearance of the mounting portion 20, destroying its aesthetics. In some cases, when the height of the rivet head 1 is greater than 3 mm, it may also become a safety hazard, such as easily colliding or scratching people. One of the main functions of the rivet head 1 is to provide a clamping force to ensure close contact between related parts, thereby forming a good sealing effect. When the height of the rivet head 1 is less than 1 mm, it may not be able to provide sufficient clamping force, resulting in poor sealing effect and even leakage problems. If the height of the rivet head 1 is less than 1 mm, then during the spot welding process, due to the action of welding heat and pressure, the rivet head 1 may warp upward. The warping of the rivet head 1 will not only affect the appearance quality of the product, but may also lead to a reduction in welding strength, thereby affecting the overall performance and reliability of the product.

[0067] It should be noted that the height of the riveted head 1 can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.8mm, 2mm, 2.1mm, 2.4mm, 2.6mm, 2.8mm or 3mm, etc. Specifically, the height of the riveted head 1 can be selected as needed, and this application does not limit this.

[0068] In one embodiment, the outer surface of the self-locking rivet 10 is coated. This coating forms a protective film on the outer surface of the self-locking rivet 10. This protective film effectively isolates oxygen, moisture, and other corrosive substances in the air, thereby slowing the corrosion rate of the rivet. The coating also improves the wear resistance of the self-locking rivet 10, thereby extending the service life of the self-locking rivet 10.

[0069] It should be noted that there are many types of plating materials, for example, the plating material can be zinc, chromium, nickel or zinc nickel, etc. Specifically, the choice of plating material can be selected according to needs, and this application does not limit this.

[0070] Reference Figure 5 , Figure 5 is a schematic diagram of the structure of a self-locking rivet and a mounting portion riveted together in an exemplary embodiment of the present disclosure. According to a second aspect of the present disclosure, a device is provided, comprising a mounting portion 20 and the self-locking rivet 10 described above. The self-locking rivet 10 is riveted to the mounting portion 20, with multiple teeth 22 embedded in the mounting portion 20, and the mounting portion 20 partially filling the groove 23. Directly riveting the self-locking rivet 10 to the mounting portion 20 allows the riveted section 2 to penetrate the mounting portion 20, eliminating the need for pre-setting holes in the mounting portion 20. This reduces the hole-making process, improves production cycle time, and reduces production costs. The multiple teeth 22 protruding from the riveted body 21 and embedded in the mounting portion 20 form a "mortise and tenon" structure between the teeth 22 and the mounting portion 20, thereby enhancing the mechanical locking effect between the riveted section 2 and the mounting portion 20. Furthermore, the contact area between the riveted section 2 and the mounting portion 20 is increased, resulting in greater friction between the riveted section 2 and the mounting portion 20, making it difficult for the riveted section 2 to separate from the mounting portion 20. During the riveting process, the grooves 23 formed between adjacent teeth 22 are partially filled with the material of the mounting portion 20, creating an interlocking effect between the filled portion and the grooves 23. This further enhances the connection strength between the self-locking rivet 10 and the mounting portion 20 and improves the peel resistance between the riveted segment 2 and the mounting portion 20. Furthermore, the fact that multiple teeth 22 are embedded in the mounting portion 20 ensures a tight connection between the teeth 22 and the mounting portion 20, while the fact that the mounting portion 20 partially fills the grooves 23 also ensures a tight connection between the grooves 23 and a portion of the mounting portion 20. This effectively prevents liquid from penetrating from the exterior of the riveted head 1 into the connection between the mounting portion 20 and the riveted segment 2.

[0071] It should be noted that in some examples, the self-locking rivet 10 is made of low-alloy steel or low-carbon steel, such as Q235 steel. Low-alloy steel is made by adding alloying elements such as chromium, nickel, and molybdenum to low-carbon steel. These alloying elements can change the structure and properties of the steel, resulting in higher strength and hardness. Consequently, the self-locking rivet 10 made of low-alloy steel has higher strength and hardness, thereby meeting the strength requirements required during the connection process. Low-alloy steel has good heat resistance and wear resistance, ensuring that the self-locking rivet 10 is always tightly connected to the mounting portion 20, and the connection between the self-locking rivet 10 and the mounting portion 20 has good sealing. Low-carbon steel has a high tensile strength, typically between 370 and 500 MPa, which can meet the strength requirements required during the connection process. The self-locking rivet 10 made of low carbon steel has good wear resistance, so that the self-locking rivet 10 is always tightly connected to the mounting portion 20, and the connection between the self-locking rivet 10 and the mounting portion 20 has good sealing performance.

[0072] Specifically, the material of the self-locking rivet 10 can be selected as needed, and this application does not limit this. In addition, there are many types of the above-mentioned equipment. For example, in one embodiment, the equipment can be a vehicle, and in other embodiments, the equipment can also be other equipment with metal.

[0073] Reference Figure 5 Along the axial direction of the riveted body 21, the height of the riveted section 2 is not greater than the thickness of the mounting portion 20. In this way, the height of the riveted section 2 is avoided to be greater than the thickness of the mounting portion 20, resulting in excessive gap and splash between the mounting portion 20 and the plate to be connected to the mounting portion 20, affecting the sealing effect of the spot welding sealant and the mechanical properties of the weld.

[0074] Specifically, during the welding process, if the height of the riveted section 2 is too large, the welding spatter phenomenon may be aggravated. The spattered welding slag may destroy the integrity of the spot welding sealant and reduce its sealing effect. By controlling the height of the riveted section 2 to be within the thickness of the mounting portion 20, the occurrence of spattering can be effectively reduced and the spot welding sealant can be protected from damage. The tightly fitting riveted section 2 and the mounting portion 20 provide a good adhesion base for the spot welding sealant, so that the sealant can effectively prevent the intrusion of harmful substances such as moisture and dust, and ensure the sealing performance of the connection between the riveted section 2 and the mounting portion 20. During the welding process, the weld needs to withstand forces from all directions. If the height of the riveted section 2 is too large, the weld may be subjected to excessive pressure or tension, thereby reducing its strength. By controlling the height of the riveted section 2 within a reasonable range, it can be ensured that the weld is subjected to uniform force, thereby improving its strength.

[0075] It should be noted that in the above embodiment, the material of the mounting portion 20 may include a 5XXX aluminum alloy, a 6XXX aluminum alloy, a 7XXX aluminum alloy, or a magnesium alloy. Specifically, the material of the mounting portion 20 may be selected as needed and is not limited in this application. Furthermore, the mounting portion 20 includes at least one mounting plate. The specific number of mounting plates may be selected as needed and is not limited in this application.

[0076] Specifically, during the riveting process, the mounting portion 20 made of 5XXX series aluminum alloy, 6XXX series aluminum alloy, 7XXX series aluminum alloy or magnesium alloy can undergo a certain degree of plastic deformation to adapt to the shape and size of the self-locking rivet 10. Specifically, the tooth portion 22 is embedded in the mounting portion 20, and the partial deformation of the mounting portion 20 fills the space between the annular receiving groove 3 and the groove 23 of the adjacent tooth portion 22. This embedded connection and deformation filling form a mechanical lock between the mounting portion 20 and the self-locking rivet 10, and increases the contact area and friction between the self-locking rivet 10 and the mounting portion 20, thereby improving the connection strength. The deformation filling effect of the mounting portion 20 not only increases the connection strength, but also fills the gap between the annular receiving groove 3 and the groove 23, reducing the risk of liquid infiltration from the outside of the riveting head 1 to the connection between the mounting portion 20 and the riveted section 2.

[0077] Reference Figures 6 to 8 , Figure 6 is a structural diagram of a self-locking rivet, a mounting portion, and a riveting device provided in an exemplary embodiment of the present disclosure, Figure 7 yes Figure 6 The self-locking rivet is shown as a structural diagram of the riveting equipment anchored into the installation part. Figure 8 Schematic diagram of the structure of the self-locking rivet, mounting portion, and thermoformed connection provided in an exemplary embodiment of the present disclosure. The following describes in detail the steps of riveting using the self-locking rivet 10 provided in this application:

[0078] The self-locking rivet 10 is placed above the mounting portion 20 (see Figure 6 ), under the cooperation of the riveting upper die 30 and the riveting lower die 40, the self-locking rivet 10 is squeezed into the interior of the mounting portion 20. This process is as follows Figure 7 As shown, the mounting portion 20 partially fills the annular receiving groove 3, so that a mechanical interlock is formed between the mounting portion 20 and the annular receiving groove 3. At the same time, another mechanical interlock is formed between the tooth portion 22 and the mounting portion 20. In addition, the portion of the mounting portion 20 that is broken by the self-locking rivet 10 falls off from the riveting lower die 40. After the riveting process is completed, the following is obtained: Figure 5 The self-locking rivet 10 is interlocked with the mounting portion 20 , the lower surface of the riveting section 2 is flush with the lower surface of the mounting portion 20 , and the boss 4 protrudes beyond the lower surface of the mounting portion 20 .

[0079] In addition, during the car body manufacturing process, the self-locking rivet 10 punching and riveting process involved in the above-mentioned application can be carried out on a dedicated self-locking rivet 10 punching and riveting equipment, or it can be carried out simultaneously with the sheet metal stamping and forming, and a self-locking rivet 10 punch is set on the stamping die. In this way, the sheet metal stamping and the self-locking rivet 10 punching and riveting can be carried out simultaneously, thereby improving production efficiency.

[0080] Reference Figure 8 The lower surface of the mounting portion 20 overlaps the upper surface of the thermoformed plate 50. Optionally, a layer of adhesive or structural glue may be applied to the overlapping surfaces of the mounting portion 20 and the thermoformed plate 50 to increase the connection strength between the mounting portion 20 and the thermoformed plate 50. The self-locking rivet 10 of the present application converts the steel / aluminum spot welding of the mounting portion 20 and the steel thermoformed plate 50 into a steel / steel spot welding between the steel self-locking rivet 10 and the steel thermoformed plate 50. A medium-frequency inverter resistance welding machine is used for welding, and the spot welding electrode tip 60 is a conventional chromium-zirconium-copper electrode. After spot welding, a nugget 70 is formed, thereby completing a high-quality connection between the mounting portion 20 and the thermoformed plate 50.

[0081] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0082] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0083] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other unless there is any conflict.

[0084] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A self-locking rivet for riveting to a mounting portion, characterized in that: The self-locking rivet includes a rivet head and a rivet section connected in sequence along a first direction, the rivet section includes a rivet body and a plurality of teeth, the plurality of teeth protruding from a side of the rivet body, the plurality of teeth being spaced apart along the circumference of the rivet body, each of the teeth extending along the first direction, and a groove being formed between two adjacent teeth; Wherein, the plurality of teeth are used to embed into the mounting portion and partially fill the groove with the mounting portion.

2. The self-locking rivet according to claim 1, characterized in that: Along the axial direction away from the riveting section, the cross-sectional area of ​​the tooth portion is arranged to decrease.

3. The self-locking rivet according to claim 2, characterized in that: The tooth portion has two first side surfaces arranged opposite to each other along the circumference of the riveted body, and the riveted body has a second side surface extending along its circumference. A first angle θ1 is formed between at least one of the two first side surfaces and the second side surface, wherein 95°≤θ1≤105°.

4. The self-locking rivet according to claim 1, characterized in that: Along the axial direction away from the riveting section, the height of the tooth portion is H1, wherein 0.5 mm ≤ H1 ≤ 2 mm.

5. The self-locking rivet according to any one of claims 1 to 4, characterized in that: The riveting body is cylindrical and extends along a first direction. The diameter of the riveting body is D1, wherein 6 mm ≤ D1 ≤ 16 mm.

6. The self-locking rivet according to any one of claims 1 to 4, characterized in that: Along the direction from the riveting head to the riveting section, the draft angle of the tooth portion is θ2, wherein 1°≤θ2≤5°.

7. The self-locking rivet according to claim 6, characterized in that: The top of the riveting section adjacent to the riveting head is provided with an annular receiving groove, and the annular receiving groove is communicated with the groove; Wherein, when the riveting section is riveted into the mounting portion, the deformed portion of the mounting portion is at least partially used to fill the groove and the annular receiving groove respectively.

8. The self-locking rivet according to claim 7, characterized in that: The annular accommodating groove is annular, and the diameter of the groove bottom of the annular accommodating groove is D2, wherein 5mm≤D2≤16mm.

9. The self-locking rivet according to any one of claims 1 to 4, characterized in that: A boss is protruding from the end surface of the riveting section facing away from the riveting head, and along the first direction, the orthographic projection of the boss is within the orthographic projection of the riveting section.

10. The self-locking rivet according to claim 9, characterized in that: Along the direction perpendicular to the axis of the riveted body, the size of the boss is L1, wherein 3mm≤L1≤10mm; and / or, Along the first direction, the height of the boss is H2, wherein 0.1 mm ≤ H2 ≤ 0.3 mm.

11. The self-locking rivet according to claim 9, characterized in that: Along the direction from the riveting head to the riveting section, the cross-sectional area of ​​the boss is gradually reduced.

12. The self-locking rivet according to any one of claims 1 to 4, characterized in that: The dimension of the rivet head along the direction perpendicular to the axis of the rivet body is L2, wherein 8mm≤L2≤20mm; and / or, Along the first direction, the height of the riveted head is H3, wherein 1 mm ≤ H3 ≤ 3 mm.

13. The self-locking rivet according to any one of claims 1 to 4, characterized in that: The outer surface of the self-locking rivet is provided with a plating layer.

14. A device, characterized in that It comprises a mounting portion and the self-locking rivet according to any one of claims 1 to 13, wherein the self-locking rivet is riveted to the mounting portion, a plurality of the teeth are embedded in the mounting portion, and a portion of the mounting portion fills the groove.

Images