Self-penetrating riveting structure, connecting assembly and connecting system

Abstract

The utility model provides a self-penetrating riveting structure, a connecting assembly and a connecting system, and the self-penetrating riveting structure comprises a first rod part which is arranged at one end of the head part of the first rod part along the axial direction; the flange part is axially connected between the head part and the first rod part; the outer diameters of the head part and the first rod part are smaller than the outer diameter of the flange part; the second rod part is axially connected between the head part and the flange part, and the outer diameter of the second rod part is smaller than that of the head part and that of the first rod part; the counter bore extends inwards from the end, deviating from the head part in the axial direction, of the first rod part, and the bottom of the counter bore is flush with the end, facing the head part, of the flange part in the axial direction. The self-penetrating riveting structure can be directly used for riveting two or more workpieces by means of a universal press, one-time installation of a plurality of workpieces is achieved, preset holes do not need to be formed in the workpieces, the problem of poor assembly caused by accumulated tolerance of a plurality of preset hole sites can be effectively solved, and the connection strength between the riveted workpieces is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners, and in particular relates to a self-piercing riveting structure, a connecting component and a connecting system. Background Art

[0002] The self-clinching nut, also known as the rivet nut or self-clinching nut, is a nut designed for thin plates or sheet metals. It is round in shape and has embossed teeth and guide grooves on one end. Its working principle is to press the nut into the preset hole of the workpiece (thin plate or sheet metal design) through the embossed teeth. Usually, the aperture of this preset hole is slightly smaller than the embossed teeth of the self-clinching nut. Under the action of pressure, the teeth of the self-clinching nut will squeeze the workpiece, causing it to plastically deform around the preset hole. Subsequently, the deformed part is guided by the guide groove, thereby producing a locking effect. However, when the number of workpieces to be riveted is large, the self-clinching action is implemented. Due to the setting of the preset holes, the workpieces cannot be accurately aligned, and the workpieces are easily pressed off-center, thus affecting the final self-clinching effect. Utility Model Content

[0003] In view of the above-mentioned problems existing in the prior art, the main purpose of the utility model is to provide a self-piercing riveting structure, a connecting assembly and a connecting system, which can directly use the self-piercing riveting structure provided by a universal press to rivet two or more workpieces, thereby realizing the installation of multiple workpieces at one time without the need to set preset holes on the workpieces. The problem of poor assembly caused by the cumulative tolerance of multiple preset hole positions can be effectively solved, and the connection strength between the workpieces after riveting is high.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] The utility model provides a self-piercing riveting structure, which comprises:

[0006] head;

[0007] A first rod portion, the first rod portion is axially arranged at one end of the head portion;

[0008] A flange portion, the flange portion being axially connected between the head portion and the first rod portion; the outer diameters of the head portion and the first rod portion are both smaller than the outer diameter of the flange portion;

[0009] a second rod portion, the second rod portion being axially connected between the head portion and the flange portion, and the outer diameter of the second rod portion being smaller than the outer diameters of the head portion and the first rod portion;

[0010] The countersunk hole extends inward from one end of the first rod portion axially away from the head portion, and the bottom of the countersunk hole is axially flush with one end of the flange portion facing the head portion.

[0011] As a further description of the above technical solution, the flange portion is provided with a plurality of anti-rotation portions on an end surface facing the first rod portion in the axial direction;

[0012] A plurality of anti-rotation portions circumferentially surround the first rod portion.

[0013] As a further description of the above technical solution, the anti-rotation portion is formed by the flange portion being concave toward the end surface of the first rod portion; and / or,

[0014] The anti-rotation portion is formed by the flange portion protruding outwardly toward the end surface of the first rod portion.

[0015] As a further description of the above technical solution, the head, the first rod portion, the flange portion and the second rod portion are of an integrated structure.

[0016] The utility model also provides a connection assembly, comprising the self-piercing riveting structure as described above, a first workpiece and at least one second workpiece;

[0017] Before connecting the self-piercing riveting structure with the workpiece, at least one of the second workpieces is axially placed at one end of the first rod portion of the self-piercing riveting structure away from the head portion thereof; the first workpiece is axially placed at one end of the first rod portion of the self-piercing riveting structure away from the head portion thereof;

[0018] The end of the first rod portion of the self-piercing riveting structure away from the head portion can axially penetrate the second workpiece and deform outward relative to the axial center line thereof to form a deformed portion that fits the second workpiece, thereby forming a first accommodating space for accommodating the second workpiece between the end surface of the flange portion axially away from the head portion; the portion of the second workpiece axially opposite to the countersunk hole of the self-piercing riveting structure can be embedded in the countersunk hole;

[0019] The end of the head of the self-piercing riveting structure away from the first rod portion can shear the first workpiece along the axial direction, so that at least the head and the second rod portion of the self-piercing riveting structure are interference-fitted in the first workpiece.

[0020] The utility model also provides a connection system, including the self-piercing riveting structure as described above, a first workpiece and at least one second workpiece; wherein,

[0021] At least the head and the second rod of the self-piercing riveting structure are interference-fitted in the first workpiece;

[0022] The self-piercing riveting structure includes a first rod portion whose end facing away from the head penetrates the second workpiece along the axial direction and a deformed portion deformed outward relative to the axial center line thereof is in contact with the second workpiece toward the end surface of the second workpiece;

[0023] The flange portion of the self-piercing riveting structure faces the end surface of the second workpiece and is in contact with the second workpiece.

[0024] As a further description of the above technical solution, a portion of the first workpiece that is opposite to the head of the self-piercing riveting structure in the axial direction is sheared and blanked by the head of the self-piercing riveting structure;

[0025] The head, the second rod and the flange of the self-piercing riveting structure are all interference-fitted in the first workpiece.

[0026] As a further description of the above technical solution, a portion of the first workpiece that is opposite to the head of the self-piercing riveting structure in the axial direction is sheared and blanked by the head of the self-piercing riveting structure;

[0027] The portion of the first rod portion of the self-piercing riveting structure between its flange portion and the second rod portion, the second rod portion and the head portion are all interference-fitted in the first workpiece;

[0028] The flange portion of the self-piercing rivet structure is interference-connected in the second workpiece.

[0029] As a further description of the above technical solution, an end surface of the head of the self-piercing riveting structure facing away from its flange portion is flush with an end surface of the first workpiece facing away from the second workpiece.

[0030] As a further description of the above technical solution, a plurality of anti-rotation parts are provided on the end surface of the flange portion of the self-piercing riveting structure facing the first rod portion in the axial direction and are engaged with the end surface of the second workpiece facing the flange portion;

[0031] A portion of the second workpiece that is opposite to the countersink of the self-piercing riveting structure in the axial direction is embedded in the countersink.

[0032] By means of the above technical solution, the outstanding effects of the utility model are:

[0033] 1. When the self-piercing riveting structure provided by the utility model is used to connect multiple workpieces, only one of the multiple workpieces needs to be placed on the end of the head of the self-piercing riveting structure that is axially away from the first rod portion thereof, and the other workpieces need to be placed on the end of the first rod portion of the self-piercing riveting structure that is axially away from the head portion thereof, and the multiple workpieces are parallel in the axial direction, and the pressure riveting equipment and the matching installation mold (such as a general press) can be directly used to perform a pressure-fitting action on them in the axial direction, so that the self-piercing riveting structure can be used to connect multiple workpieces, which is beneficial to improving the connection efficiency of the workpieces, and the connection process is clean, environmentally friendly, simple and convenient, and there is no need to use the special equipment required for the installation of the self-piercing product, which is also beneficial to saving equipment costs;

[0034] 2. During the pressing action, the workpiece placed at the end of the first rod of the self-piercing riveting structure axially away from the head will be axially penetrated by the end of the first rod away from the head, so that the part of the workpiece opposite to the countersunk hole of the self-piercing riveting structure (i.e., the waste part) will be embedded in the countersunk hole without affecting the connection effect of the outside of the workpiece; at the same time, the part of the first rod that passes through the head in the axial direction will be deformed outward relative to its axial center line due to the limitation of the mold, and further fit with the workpiece, thereby cooperating with the end face of the flange part axially away from the head, jointly accommodating the workpiece and forming an annular seal with the workpiece (it should be understood that the workpiece finally accommodated between the deformed part of the first rod and the flange part will also be deformed to a certain extent); and Under the compression action, the head of the self-piercing riveting structure will axially transmit shear force to the workpiece placed at one end of the self-piercing riveting structure axially away from the first rod portion, thereby completing the stamping of the workpiece, and the part of the stamped workpiece opposite to the head (i.e., the waste part) will be dropped to a pre-set waste collection point for unified treatment. Since the outer diameter of the second rod portion between the head and the flange portion is smaller than the outer diameters of the head, the flange portion and the first rod portion, during the stamping process, part of the material of the workpiece will flow to the radial outer periphery of the second rod portion axially located between the flange portion and the head due to the extrusion of the end face of the flange portion or the second rod portion toward the head, so that at least the head and the second rod portion of the self-piercing riveting structure cooperate with each other to achieve the riveting effect on the workpiece. Therefore, using the self-piercing riveting structure to connect workpieces is not only conducive to improving the workpiece connection efficiency and saving equipment costs, but also multiple workpieces to be connected do not need to be pre-set before connection, which effectively solves the problem of poor assembly caused by the cumulative tolerance of the hole positions of multiple pre-set holes on the workpieces. The connection strength between the workpieces after riveting is also high. Therefore, the self-piercing riveting structure is more suitable for the connection of workpieces of different materials and different thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a structural schematic diagram of the self-piercing riveting structure in the first embodiment of the utility model;

[0036] Figure 2 It is a cross-sectional schematic diagram of the connection assembly before assembly in the first embodiment of the utility model;

[0037] Figure 3 It is a cross-sectional schematic diagram of the assembled connecting assembly in the first embodiment of the utility model;

[0038] Figure 4 This is a half-section structural schematic diagram of the connection system in the first embodiment of the utility model;

[0039] Figure 5 This is a structural schematic diagram of the self-piercing riveting structure in the second embodiment of the utility model;

[0040] Figure 6It is a cross-sectional schematic diagram of the connection assembly before assembly in the second embodiment of the utility model;

[0041] Figure 7 It is a cross-sectional schematic diagram of the assembled connecting assembly in the second embodiment of the utility model;

[0042] Figure 8 It is a half-section structural schematic diagram of the connection system in the second embodiment of the utility model.

[0043] Description of Figure Numbers:

[0044] 1. Head; 2. First rod; 3. Flange; 4. Second rod; 5. Countersunk hole; 6. Anti-rotation part; 7. First workpiece; 8. Second workpiece; 9. Deformation part; 10. First mounting mold; 11. Second mounting mold; 12. Waste. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0046] In the description of the present utility model, it should be noted that the terms "upper", "middle", "lower", "inside", "outside", "front", "back", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The following describes the implementation method of the present utility model based on its overall structure.

[0047] See also Figures 1 to 8 The utility model discloses a self-piercing riveting structure, which comprises:

[0048] Head 1;

[0049] A first rod portion 2, the first rod portion 2 is axially arranged at one end of the head portion 1;

[0050] A flange portion 3, wherein the flange portion 3 is axially connected between the head portion 1 and the first rod portion 2; the outer diameters of the head portion 1 and the first rod portion 2 are both smaller than the outer diameter of the flange portion 3;

[0051] A second rod portion 4, wherein the second rod portion 4 is axially connected between the head portion 1 and the flange portion 3, and an outer diameter of the second rod portion 4 is smaller than an outer diameter of the head portion 1 and the first rod portion 2;

[0052] The countersunk hole 5 extends inward from one end of the first rod portion 2 axially away from the head portion 1 , and the bottom of the countersunk hole 5 is axially flush with one end of the flange portion 3 facing the head portion 1 .

[0053] With the above structure, when connecting multiple workpieces, there is no need to use special equipment required for the installation of self-piercing products. It is only necessary to place one of the multiple workpieces on the end of the head 1 of the self-piercing riveting structure axially away from the first rod 2, and the remaining workpieces are placed on the end of the first rod 2 of the self-piercing riveting structure axially away from the head 1. If the multiple workpieces are parallel in the axial direction, they can be directly pressed together in the axial direction using a riveting device and a matching installation mold (such as a universal press). The self-piercing riveting structure can be used to connect multiple workpieces, which is beneficial to improving the workpiece connection efficiency. The connection process is clean, environmentally friendly, simple and convenient, and also beneficial to saving equipment costs. Specifically, during the pressing action, the workpiece placed at the end of the first rod portion 2 of the self-piercing riveting structure axially away from its head portion 1 will be axially penetrated by the end of the first rod portion 2 away from the head portion 1, so that its portion opposite to the countersunk hole 5 of the self-piercing riveting structure (i.e., the waste material 12 portion) will be embedded in the countersunk hole 5 without affecting the connection effect on the outside of the workpiece; at the same time, the portion of the first rod portion 2 axially passing through the head portion 1 will be deformed outward relative to its axial center line due to the limitation of the mold, and further fit with the workpiece, thereby cooperating with the end face of the flange portion 3 axially away from the head portion 1, jointly accommodating the workpiece and forming an annular seal with the workpiece (it should be understood that the workpiece finally accommodated between the deformed portion of the first rod portion 2 and the flange portion 3 will also undergo a certain degree of deformation); and the workpiece subjected to the pressing action The head 1 of the self-piercing riveting structure will axially transmit shear force to the workpiece placed at one end of the workpiece axially away from the first rod 2, thereby completing the stamping of the workpiece, and the part of the stamped workpiece opposite to the head 1 (i.e., the waste 12 part) will be dropped to a pre-set waste 12 collection place for unified treatment, and since the outer diameter of the second rod 4 between the head 1 and the flange 3 is smaller than the outer diameters of the head 1, the first rod 2 and the flange 3, during the stamping process, the workpiece will also be squeezed by the flange 3 or the second rod 4 toward the end face of the head 1, so that part of its material will flow to the radial outer periphery of the second rod 4 axially located between the flange 3 and the head 1, so that at least the head 1 and the second rod 4 of the self-piercing riveting structure cooperate with each other to achieve the riveting effect on the workpiece. Therefore, using the self-piercing riveting structure to connect workpieces is not only conducive to improving the workpiece connection efficiency and saving equipment costs, but also the multiple workpieces to be connected do not need to be provided with preset holes before connection, which effectively solves the problem of poor assembly caused by the cumulative tolerance of the hole positions of multiple preset holes on the workpieces. The connection strength between the workpieces after riveting is also high. Therefore, the self-piercing riveting structure is more suitable for connection operations of workpieces of different materials and different thicknesses.

[0054] See also Figures 1 to 4Specifically, in the first embodiment, the self-piercing riveting structure includes a first rod 2, a second rod 4 and a head 1 which are connected in sequence from top to bottom, and the flange 3 included therein is connected to the middle position of the first rod 2 near its lower end surface, so that the first rod 2 has a portion sufficient to penetrate the workpiece upward and undergo deformation, the outer diameters of the flange 3, the first rod 2, the head 1 and the second rod 4 are reduced in sequence, and the countersunk hole 5 included therein extends vertically downward from the upper end of the first rod 2, and its bottom is flush with the lower end of the flange 3. In addition, a plurality of anti-rotation portions 6 are provided on the upper end surface of the flange 3, and the plurality of anti-rotation portions 6 surround the first rod 2 in the circumferential direction, so that after part of the material of the workpiece is accommodated in the first accommodation space formed by the part of the first rod 2 deformed outward along its axial center line and the upper end surface of the flange 3, the part of the material of the workpiece will be interlocked with the anti-rotation portion 6, preventing the workpiece from rotating relative to the self-piercing riveting structure after being connected, thereby providing high torque.

[0055] Specifically, in the first embodiment, the anti-rotation portion 6 is divided into two types, one of which is formed by the upper end surface of the flange portion 3 being concave inward, and the other is formed by the upper end surface of the flange portion 3 being convex outward, and the concave anti-rotation portion 6 and the convex anti-rotation portion 6 are arranged equidistantly along the circumferential direction, so that after the workpiece is penetrated by the first rod portion 2, the material that gradually flows into the deformed part of the first rod portion 2 and the flange portion 3 due to the extrusion force exerted on the upper part of the first rod portion 2 by its axial center line being deformed outward can be evenly interlocked with the anti-rotation portion 6, without causing the part exposed to the periphery of the self-piercing riveting structure to deform, thereby avoiding the problem of unqualified external parameters of the workpiece after riveting. Of course, in other embodiments, the anti-rotation portion 6 can also be formed by only the concave end surface of the flange portion 3 toward the first rod portion 2, or only the anti-rotation portion 6 is convex from the flange portion 3 toward the end surface of the first rod portion 2.

[0056] Specifically, in the first embodiment, the head 1, the first rod 2, the flange 3 and the second rod 4 are of an integrated structure, which ensures the mechanical strength of the self-piercing riveting structure.

[0057] See also Figures 5 to 8Specifically, in the second embodiment, different from the first embodiment, the first rod portion 2, the flange portion 3, the second rod portion 4 and the head portion 1 included in the self-piercing riveting structure are sequentially connected from top to bottom, the outer diameters of the flange portion 3, the head portion 1, the first rod portion 2 and the second rod portion 4 are sequentially reduced, and the countersunk hole 5 included therein still extends vertically from the upper end of the first rod portion 2 to a position flush with the lower end surface of the flange portion 3. Of course, in other embodiments, on the premise that the outer diameters of the head portion 1 and the first rod portion 2 are both greater than the outer diameter of the second rod portion 4, the outer diameters of the head portion 1 and the first rod portion 2 may also be the same, so that when the workpiece punched by the head portion 1 flows relatively to the outer periphery of the second rod portion 4, the first rod portion 2 can squeeze the workpiece on the side facing the head portion 1, thereby fully ensuring the final connection effect of the workpiece with the self-piercing riveting structure.

[0058] See also Figures 2 to 4 Specifically, the first embodiment of the utility model further provides a connection assembly, including the self-piercing riveting structure as described above, a first workpiece 7 and at least one second workpiece 8 (hereinafter, one second workpiece 8 is taken as an example for description), and both workpieces are in plate shape.

[0059] In this embodiment, before connecting the self-piercing riveting structure to the workpiece, it is only necessary to first place the first workpiece 7 on the second mounting die 11 matched with the riveting device, and then place the self-piercing riveting structure on the first workpiece 7 with the head 1 facing and the first rod 2 facing upward (the head 1 of the self-piercing riveting structure is opposite to the blanking position of the second mounting die 11 in the vertical direction), and then place the second workpiece 8 on the upper end of the first rod 2 of the self-piercing riveting structure, so that the riveting device can be started, so that the first mounting die 10 located above the second workpiece 8 moves vertically downward, so that the first mounting die 10 contacts the second workpiece 8 and continues to move downward, which will cause the self-piercing riveting structure to be connected to the second workpiece 8. The upper end of the first rod 2 of the structure penetrates upward, and then the guide portion formed between the central convex portion and the circumferential concave portion of the first installation mold 10 will guide the first rod 2 to deform outward relative to its axial center line to form a deformed portion 9 that fits the second workpiece 8. A first accommodating space is formed between the deformed portion 9 and the upper end surface of the flange portion 3 to accommodate the material portion of the second workpiece 8 located at the periphery of the first rod 2. It should be understood that the material portion of the second workpiece 8 located at the periphery of the first rod 2 will also undergo a certain degree of deformation and flow into the first accommodating space as the first rod 2 deforms, so that the self-piercing riveting structure and the second workpiece 8 form a stable anti-thrust structure. The waste material 12 of the second workpiece 8 opposite to the countersunk hole 5 of the self-piercing riveting structure in the vertical direction falls due to the penetration action of the first rod 2, and is embedded in the countersunk hole 5 due to the continued downward action of the first installation mold 10, which will not affect the external connection of the second workpiece 8. Under the joint action of the anti-thrust structure formed by the pressure riveting equipment, the two matching installation molds, the second workpiece 8 and the deformation part 9, and the flange part 3, the first workpiece 7 will be sheared by the head 1 of the self-piercing riveting mechanism at the same time, that is, the head 1 of the self-piercing riveting mechanism will punch the first workpiece 7, so that the waste material 12 part corresponding to the blanking position of the second installation mold 11 is punched off from the first workpiece 7 and falls into the blanking position of the second installation mold 11 for unified treatment. Since the outer diameter of the first rod 2 of the self-piercing riveting mechanism is larger than the head 1 and the second rod 4, the first workpiece 7 will be deformed due to the extrusion of the lower end of the first rod 2 during the punching process, so that part of the material flows into the outer peripheral position of the second rod 4, and finally the part of the first rod 2 of the self-piercing riveting below the flange part 3, the head 1 and the second rod 4 are all interference fit in the first workpiece 7 to realize the riveting of the first workpiece 7, so that the first workpiece 7 and the second workpiece 8 without a preset hole are connected as a whole.

[0060] See also Figures 6 to 8In the second implementation, different from the first embodiment, since the first rod portion 2 has no portion below the flange portion 3, during the stamping process, the deformation of the first workpiece 7 is caused by the direct extrusion of the flange portion 3, so that part of its material will flow into the outer peripheral position of the second rod portion 4, and finally the flange portion 3, the head portion 1 and the second rod portion 4 of the self-piercing rivet structure are all interference-fitted in the first workpiece 7 to achieve riveting of the first workpiece 7, so that the first workpiece 7 without a preset hole and the second workpiece 8 are connected as a whole. The connection between the second workpiece 8 and the self-piercing rivet structure is still consistent with the first embodiment.

[0061] Specifically, the utility model also provides a connection system, including the self-piercing riveting structure as described above, a first workpiece 7 and at least one second workpiece 8; wherein, at least the head 1 and the second rod 4 included in the self-piercing riveting structure are interference fit in the first workpiece 7; the upper end of the first rod 2 included in the self-piercing riveting structure passes through the second workpiece 8 in the vertical direction, and the deformation portion 9 formed by the deformation outward relative to its own axial center line faces the end surface of the second workpiece 8 and fits with the second workpiece 8; the upper end surface of the flange portion 3 included in the self-piercing riveting structure fits with the second workpiece 8.

[0062] See also Figure 3 and Figure 4 Specifically, in the first embodiment, the waste material 12 portion of the first workpiece 7 opposite to the head portion 1 of the self-piercing riveting structure in the vertical direction is sheared downward by the head portion 1 of the self-piercing riveting structure; the portion of the first rod portion 2 of the self-piercing riveting structure located between its flange portion 3 and the second rod portion 4, the second rod portion 4 and the head portion 1 are all interference fit in the first workpiece 7; the flange portion 3 of the self-piercing riveting structure is interference connected in the second workpiece 8.

[0063] See also Figure 7 and Figure 8 Specifically, in the second embodiment, the waste material 12 portion of the first workpiece 7 opposite to the head 1 of the self-piercing riveting structure in the vertical direction is sheared downward by the head 1 of the self-piercing riveting structure; however, different from the first embodiment, the head 1, the second rod 4 and the flange 3 of the self-piercing riveting structure are all interference fit in the first workpiece 7.

[0064] See also Figure 3 , Figure 4 , Figure 7 as well as Figure 8 Specifically, in the first embodiment and the second embodiment, after the first workpiece 7 and the second workpiece 8 are connected, the lower end surface of the head 1 of the self-piercing riveting structure is flush with the lower end surface of the first workpiece 7, ensuring the external connection effect of the workpieces.

[0065] Specifically, in the first embodiment and the second embodiment, the multiple anti-rotation portions 6 provided on the upper end surface of the flange portion 3 of the self-piercing riveting structure are interlocked with the lower end surface of the second workpiece 8 to play an anti-rotation role; the waste material 12 portion of the second workpiece 8 opposite to the countersunk hole 5 of the self-piercing riveting structure in the vertical direction is embedded in the countersunk hole 5.

[0066] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not limited to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any changes, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-piercing riveting structure, characterized in that: include: head; A first rod portion, the first rod portion is axially arranged at one end of the head portion; A flange portion, the flange portion being axially connected between the head portion and the first rod portion; the outer diameters of the head portion and the first rod portion are both smaller than the outer diameter of the flange portion; a second rod portion, the second rod portion being axially connected between the head portion and the flange portion, and the outer diameter of the second rod portion being smaller than the outer diameters of the head portion and the first rod portion; The countersunk hole extends inward from one end of the first rod portion axially away from the head portion, and the bottom of the countersunk hole is axially flush with one end of the flange portion facing the head portion.

2. The self-piercing riveting structure according to claim 1, characterized in that: The flange portion is provided with a plurality of anti-rotation portions on an end surface facing the first rod portion in the axial direction; A plurality of anti-rotation portions circumferentially surround the first rod portion.

3. The self-piercing riveting structure according to claim 2, characterized in that: The anti-rotation portion is formed by the flange portion being concave toward the end surface of the first rod portion; and / or, The anti-rotation portion is formed by the flange portion protruding outwardly toward the end surface of the first rod portion.

4. The self-piercing riveting structure according to claim 1, characterized in that: The head, the first rod portion, the flange portion and the second rod portion are integrally structured.

5. A connection assembly, characterized in that: comprising the self-piercing riveting structure according to any one of claims 1 to 4, a first workpiece and at least one second workpiece; Before connecting the self-piercing riveting structure with the workpiece, at least one of the second workpieces is axially placed at one end of the first rod portion of the self-piercing riveting structure away from the head portion thereof; the first workpiece is axially placed at one end of the first rod portion of the self-piercing riveting structure away from the head portion thereof; The end of the first rod portion of the self-piercing riveting structure away from the head portion can axially penetrate the second workpiece and deform outward relative to the axial center line thereof to form a deformed portion that fits the second workpiece, thereby forming a first accommodating space for accommodating the second workpiece between the end surface of the flange portion axially away from the head portion; The portion of the second workpiece that is opposite to the countersunk hole of the self-piercing riveting structure in the axial direction can be embedded in the countersunk hole; The end of the head of the self-piercing riveting structure away from the first rod portion can shear the first workpiece along the axial direction, so that at least the head and the second rod portion of the self-piercing riveting structure are interference-fitted in the first workpiece.

6. A connection system, characterized in that: It comprises the self-piercing riveting structure according to any one of claims 1 to 4, a first workpiece and at least one second workpiece; wherein, At least the head and the second rod of the self-piercing riveting structure are interference-fitted in the first workpiece; The self-piercing riveting structure includes a first rod portion whose end facing away from the head penetrates the second workpiece along the axial direction and a deformed portion deformed outward relative to the axial center line thereof is in contact with the second workpiece toward the end surface of the second workpiece; The flange portion of the self-piercing riveting structure faces the end surface of the second workpiece and is in contact with the second workpiece.

7. The connection system according to claim 6, characterized in that The portion of the first workpiece opposite to the head of the self-piercing riveting structure in the axial direction is sheared and blanked by the head of the self-piercing riveting structure; The head, the second rod and the flange of the self-piercing riveting structure are all interference-fitted in the first workpiece.

8. The connection system according to claim 6, characterized in that The portion of the first workpiece opposite to the head of the self-piercing riveting structure in the axial direction is sheared and blanked by the head of the self-piercing riveting structure; The portion of the first rod portion of the self-piercing riveting structure between its flange portion and the second rod portion, the second rod portion and the head portion are all interference-fitted in the first workpiece; The flange portion of the self-piercing riveting structure is interference-connected in the second workpiece.

9. The connection system according to claim 6, characterized in that: The end surface of the head of the self-piercing riveting structure facing away from the flange portion is flush with the end surface of the first workpiece facing away from the second workpiece.

10. The connection system according to claim 6, characterized in that A plurality of anti-rotation parts are provided on the end surface of the flange portion of the self-piercing riveting structure facing the first rod portion in the axial direction, and are engaged with the end surface of the second workpiece facing the flange portion; A portion of the second workpiece that is opposite to the countersink of the self-piercing riveting structure in the axial direction is embedded in the countersink.

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