Fastener, riveting assembly, welding and riveting assembly and welding and riveting die

Abstract

The invention discloses a fastener, a riveting assembly, a welding and riveting assembly and a welding and riveting die. A fastener comprises a body and a leakage-proof ring. The body comprises a main body, a boss and a convex ring; the main body is provided with a supporting surface which is suitable for supporting a metal plate; the boss protrudes out of the supporting face and is provided with a riveting groove, a riveting head stretches into the riveting groove and then applies force to the groove wall of the riveting groove, so that the boss deforms, and the riveting effect is achieved. The protruding ring is annular, protrudes out of the supporting face and surrounds the boss, and the section size of the protruding ring is gradually reduced in the direction away from the supporting face so that the protruding ring can be welded to a metal plate or penetrate into the metal plate to achieve sealing. A plurality of anti-rotation grooves are formed in the protruding ring, and gaps exist between the anti-rotation grooves and the outer surface of the protruding ring. The anti-rotation groove is filled with a metal plate during riveting, and the anti-rotation effect is achieved. The boss is sleeved with the leakage-proof ring, under the action of deformation of the boss, the leakage-proof ring also deforms, so that sealing between the leakage-proof ring and the metal plate is achieved, the double leakage-proof effect between the leakage-proof ring and the convex ring is achieved, and the leakage-proof effect is good.

Description

Technical Field

[0001] The present invention relates to the field of connectors, and particularly to a fastener, a riveting assembly, a welding and riveting assembly, and a welding and riveting die. Background Art

[0002] At present, after the conventional fastener is tightened and fixed, since it is a hard connection, there is a certain gap between the supporting surface of the fastener and the contact surface of the sheet metal, and it cannot play a role in preventing leakage of substances such as gas, liquid, and dust. With the development of the new energy vehicle industry and technology, the market has put forward higher requirements for the leak-proof performance of fasteners. In the prior art, a glue injection groove and a glue injection hole are reserved on the nut, and welding feet are evenly distributed circumferentially. After welding, it is necessary to inject leak-proof sealant into the glue injection groove through the glue injection hole to achieve the purpose of preventing leakage. However, this method has a complex product structure - it is necessary to pre-set glue injection holes and glue injection grooves on the nut. The product production process is complex, the die life is low, and the manufacturing cost is high - the glue injection holes and glue injection grooves need to be realized by complex forming processes. The narrow holes make the die processing difficult, stress concentration is easy to crack, and the manufacturing cost is high. The leak-proof process is complex and the efficiency is low - after welding, it is necessary to inject leak-proof sealant into the glue injection groove through the glue injection hole to achieve the purpose of preventing leakage. The glue injection process makes the process complex and the cost increases. The glue injection leak-proof effect is poor, and the leak-proof performance is difficult to guarantee - in the closed and narrow closed holes, the flow ability of the colloid is limited and it is difficult to ensure that the holes are completely filled, and air holes and bubbles are easily generated. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects or problems in the background art, and provide a fastener, a riveting assembly, a welding and riveting assembly, and a welding and riveting die.

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

[0005] Solution 1, a fastener, comprising

[0006] a body, which includes a main body, a boss, and a convex ring; the main body is provided with a supporting surface; the boss protrudes from the supporting surface and is provided with a riveting groove; the convex ring is annular, it protrudes from the supporting surface and surrounds the boss, its cross-sectional dimension gradually decreases in the direction away from the supporting surface, and a plurality of anti-rotation grooves are provided on the convex ring, and there is a gap between the anti-rotation grooves and the outer surface of the convex ring;

[0007] a leak-proof ring, which is sleeved outside the boss.

[0008] Solution 2, based on Solution 1, the cross-section of the convex ring is triangular, and the inclination angle of the convex ring away from the boss is smaller than the inclination angle of the convex ring close to the boss.

[0009] Solution three, based on solution one, the main body is provided with a material containing groove, the material containing groove opens to the supporting surface and fits and is arranged around the boss.

[0010] Solution 4, based on Solution 1, the boss is located in the middle of the support surface, and the convex ring is located at the outer edge of the support surface.

[0011] Solution five, based on solution one, the main body is further provided with a screw hole, and the screw hole is connected to the rivet groove.

[0012] Solution six, based on solution one, the main body is further provided with a screw rod, and the screw rod protrudes from the side of the main body away from the supporting surface, or protrudes from the bottom of the riveting groove.

[0013] Solution seven, based on solution one, the outer wall of the boss is provided with limiting teeth, and the anti-leakage ring is suitable for engaging with the limiting teeth.

[0014] Option 8, a riveted assembly, comprising sheet metal and a fastener as described in any one of Options 1 to 7, the sheet metal being provided with a through hole, the convex ring being suitable for piercing the sheet metal so that the sheet metal fits the support surface and the sheet metal fills the anti-rotation groove; the boss being suitable for extending into the through hole and being suitable for deforming to fasten the sheet metal, so that the anti-leakage ring is deformed, so that the gap between the boss and the through hole is eliminated.

[0015] Solution nine, a welding and riveting assembly, comprising sheet metal and a fastener as described in any one of Solutions one to seven, the sheet metal being provided with a through hole, the convex ring being suitable for being welded to the sheet metal so that the sheet metal fits the support surface, the boss being suitable for extending into the through hole and being suitable for being deformed to fasten the sheet metal, so that the anti-leakage ring is deformed, so that the gap between the boss and the through hole is eliminated.

[0016] Solution 10, a welding and riveting mold, which is suitable for fixing a sheet metal and a fastener as described in any one of Solution 1 to Solution 7 together, the sheet metal is provided with a through hole suitable for the boss to extend into, and the welding and riveting mold includes

[0017] An electrode, which is provided with a receiving groove, and is suitable for forming a current path among the sheet metal, the electrode and the convex ring when contacting the sheet metal, so that the convex ring is welded to the sheet metal;

[0018] An insulating sleeve, which is placed in the receiving groove and is provided with a mounting groove;

[0019] A rivet head is located at the bottom of the mounting groove and is provided with a riveting portion extending out of the mounting groove. The outer wall size of the riveting portion gradually increases along the groove bottom close to the mounting groove. The rivet head is suitable for extending into the riveting groove and abutting against the groove wall of the riveting groove to deform the boss.

[0020] From the above description of the present invention and its preferred embodiments, it can be seen that, 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:

[0021] 1. In scheme 1 and its preferred embodiment, a fastener includes a body and a leak-proof ring.

[0022] The main body includes a main body, a boss, and a convex ring; the main body is provided with a supporting surface, which is suitable for supporting sheet metal; the boss protrudes from the supporting surface and is provided with a rivet groove, and the rivet head is inserted into the rivet groove to apply force to the groove wall of the rivet groove, so that the boss is deformed to achieve the riveting effect; the convex ring is annular, protrudes from the supporting surface and is arranged around the boss, and the cross-sectional size of the convex ring gradually decreases in the direction away from the supporting surface, so as to facilitate welding with the sheet metal or piercing the sheet metal and achieve sealing. A plurality of anti-rotation grooves are provided on the convex ring, and there is a gap between the anti-rotation groove and the outer surface of the convex ring. At the position where the anti-rotation groove is located, the convex ring is thinner and easier to weld, and because there is a gap between the anti-rotation groove and the outer surface of the convex ring, the convex ring still fully contacts the sheet metal during welding to ensure sealing. The anti-rotation groove is filled with sheet metal during riveting, which plays an anti-rotation role. The anti-leakage ring is set outside the boss, and under the action of the boss deformation, the anti-leakage ring also deforms, thereby achieving sealing with the sheet metal, forming a double anti-leakage effect with the convex ring, and the anti-leakage effect is good. The fastener has reliable performance, simple structure and process, low comprehensive cost and good anti-leakage effect.

[0023] 2. In scheme 2 and its preferred embodiment, the cross-section of the convex ring is triangular, and the inclination angle of the convex ring away from the boss is smaller than the inclination angle of the convex ring close to the boss, so that the geometric center of the weld foot is relatively far away from the leak-proof ring, and less heat is conducted to the leak-proof ring.

[0024] 3. In scheme three and its preferred embodiment, the main body is provided with a material containing groove, which opens to the supporting surface and fits and is arranged around the boss, so that the sheet metal material flows to the material containing groove during riveting, to ensure that the boss does not exceed the sheet metal plane after riveting and does not affect the connection with other parts.

[0025] 4. In scheme 4 and its preferred embodiment, the boss is located in the middle of the support surface, and the convex ring is located at the outer edge of the support surface, so that the leak-proof ring on the boss is away from the center of the welding heat source, thereby minimizing the risk of failure of the leak-proof ring due to overheating.

[0026] 5. In scheme five and its preferred embodiment, the main body is further provided with a screw hole, which is connected to the rivet groove, and the screw hole has a thread to achieve fastening with another object.

[0027] 6. In scheme six and its preferred embodiment, the main body is further provided with a screw rod, which protrudes from the side of the main body away from the supporting surface, or protrudes from the bottom of the riveting groove, and the screw rod has threads to achieve fastening with another object.

[0028] 7. In Solution VII and its preferred embodiments, the outer wall of the boss is provided with limiting teeth, and the leak-proof ring is adapted to be fitted with the limiting teeth to prevent the leak-proof ring from rotating relative to the boss or disengaging from it.

[0029] 8. In Solution VIII and its preferred embodiments, a riveting assembly includes a sheet metal and the above-mentioned fastener. The sheet metal is provided with a through hole. The convex ring is adapted to pierce into the sheet metal so that the sheet metal fits against the supporting surface, realizes sealing at the convex ring, and enables the sheet metal to fill the anti-rotation groove to achieve the anti-rotation effect; the boss is adapted to extend into the through hole and is adapted to deform to fasten the sheet metal, so that the leak-proof ring deforms, and the gap between the boss and the through hole is eliminated to achieve double sealing.

[0030] 9. In Solution IX and its preferred embodiments, a welding and riveting assembly includes a sheet metal and the above-mentioned fastener. The sheet metal is provided with a through hole. The convex ring is adapted to be welded to the sheet metal so that the sheet metal fits against the supporting surface to achieve sealing; the boss is adapted to extend into the through hole and is adapted to deform to fasten the sheet metal, so that the leak-proof ring deforms, and the gap between the boss and the through hole is eliminated to achieve double sealing.

[0031] 10. In Solution X and its preferred embodiments, a welding and riveting die is adapted to fix the sheet metal and the above-mentioned fastener together. The sheet metal is provided with a through hole adapted for the boss to extend into. The welding and riveting die includes an electrode, an insulating sleeve, and a riveting head. The electrode is provided with a receiving groove, which is adapted to form a current path of the sheet metal, the electrode, and the convex ring when contacting the sheet metal, so that the convex ring is welded to the sheet metal; the insulating sleeve is placed in the receiving groove and is provided with a mounting groove; the insulating sleeve isolates the electrode and the riveting head from each other to prevent current shunting during welding. The riveting head is located at the bottom of the mounting groove and is provided with a riveting portion extending out of the mounting groove. The outer wall dimension of the riveting portion gradually increases along the direction close to the bottom of the mounting groove. The riveting head is adapted to extend into the riveting groove and abut against the groove wall of the riveting groove to deform the boss to achieve riveting. The processing of riveting and welding is carried out simultaneously in one pressing stroke, and the production efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for description in the embodiments. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0033] Figure 1 It is a three-dimensional view of the body in Embodiment 1;

[0034] Figure 2 It is a three-dimensional view of the fastener in Embodiment 1;

[0035] Figure 3 It is a structural schematic diagram of the fastener in Embodiment 1;

[0036] Figure 4Isometric view of the second type of fastener in Embodiment 1;

[0037] Figure 5 Schematic structural view of the second type of fastener in Embodiment 1;

[0038] Figure 6 Isometric view of the third type of fastener in Embodiment 1;

[0039] Figure 7 Schematic structural view of the third type of fastener in Embodiment 1;

[0040] Figure 8 Schematic structural view of the welding and riveting assembly during welding in Embodiment 3;

[0041] Figure 9 Schematic structural view of the welding and riveting assembly in Embodiment 3;

[0042] Figure 10 Isometric view of the welding and riveting die in Embodiment 3;

[0043] Figure 11 Schematic structural view of the welding and riveting die in Embodiment 3;

[0044] Main reference numeral description:

[0045] Body 10; Main body 1; Support surface 11; Material-containing groove 12; Boss 2; Riveting groove 21; Limiting teeth 22; Convex ring 3; Anti-rotation groove 31; Screw hole 4; Screw rod 5; Anti-leakage ring 20; Sheet metal 30; Through hole 301;

[0046] Welding and riveting die 40; Electrode 6; Accommodating groove 61; Insulating sleeve 7; Installation groove 71; Riveting head 8; Detailed implementation manners

[0047] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the preferred embodiments of the present invention and should not be regarded as excluding other embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0048] In the claims, description, and above-mentioned accompanying drawings of the present invention, unless otherwise clearly defined, when using terms such as "first", "second", or "third", etc., they are all used to distinguish different objects and are not used to describe a specific order.

[0049] In the claims, specification and the above-mentioned drawings of the present invention, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the present invention.

[0050] In the claims, specification and the above drawings of the present invention, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0051] In the claims, description and drawings of the present invention, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0052] A fastener comprises a body 10 and a leak-proof ring 20.

[0053] refer to Figures 1 - 3 The body 10 includes a main body 1, a boss 2, and a convex ring 3;

[0054] The outer contour of the main body 1 can be circular or polygonal. In this embodiment, the outer contour of the main body 1 is circular. The main body 1 is provided with a support surface 11 and a material receiving groove 12. The support surface 11 is suitable for abutting against the sheet metal 30. The material receiving groove 12 opens on the support surface 11.

[0055] The boss 2 is annular, and the boss 2 protrudes from the support surface 11. In this embodiment, the boss 2 is located in the middle of the support surface 11 and is coaxially arranged with the main body 1. The boss 2 is provided with a rivet groove 21. The rivet groove 21 and the side away from the support surface 11 have an opening for the rivet head 8 to extend into. The rivet groove 21 may be provided with a guide section at the opening to facilitate the rivet head 8 to extend into. The material storage groove 12 opens at the support surface 11 and fits and is arranged around the boss 2, that is, the material storage groove 12 is arranged at the intersection of the boss 2 and the support surface 11. The outer wall of the boss 2 is provided with a limit tooth 22.

[0056] The convex ring 3 is annular and serves to weld to or penetrate into the sheet metal 30. The convex ring 3 protrudes from the support surface 11 and surrounds the boss 2. In this embodiment, the convex ring 3 is located at the outer edge of the support surface 11 and is away from the boss 2. The cross-sectional dimension of the convex ring 3 gradually decreases in the direction away from the support surface 11. In this embodiment, the cross-section of the convex ring 3 is triangular, and the inclination angle of the convex ring 3 away from the boss 2 is smaller than the inclination angle of the convex ring 3 close to the boss 2. A number of anti-rotation grooves 31 are provided on the convex ring 3. There is a gap between the anti-rotation grooves 31 and the outer surface of the convex ring 3, that is, the anti-rotation grooves 31 are located in the inner ring of the convex ring 3. At the position where the anti-rotation grooves 31 are located, the convex ring 3 is thinner and is more easily welded, or is filled by the sheet metal 30 during riveting, playing a role in preventing rotation.

[0057] The leak-proof ring 20 is sleeved outside the boss 2, and the leak-proof ring 20 is adapted to fit into the limit teeth 22 to prevent the leak-proof ring 20 from rotating or disengaging relative to the boss 2 (such as the leak-proof ring 20 wrapping the upper and lower surfaces of the anti-rotation teeth). The leak-proof ring 20 is annular and is adapted to deform. Since the boss 2 is away from the convex ring 3, the leak-proof ring 20 can be away from the welding heat and prevent failure caused by overheating.

[0058] The fastener can be a nut. Specifically, the body 10 is provided with a threaded hole 4, and the threaded hole 4 communicates with the riveting groove 21 to connect with an external object.

[0059] Reference Figures 4 - 7 , the fastener can also be a bolt. Specifically, the body 10 is further provided with a screw rod 5, and the screw rod 5 protrudes from one side of the main body 1 away from the support surface 11 or protrudes from the bottom of the riveting groove 21.

[0060] Embodiment Two

[0061] A riveting assembly includes a sheet metal 30 and the above-mentioned fastener,

[0062] The sheet metal 30 is provided with a through hole 301. The convex ring 3 is adapted to penetrate into the sheet metal 30 so that the sheet metal 30 fits against the support surface 11 and the sheet metal 30 fills the anti-rotation grooves 31; the boss 2 is adapted to extend into the through hole 301 and is adapted to deform to clamp the sheet metal 30, so that the leak-proof ring 20 deforms, and the gap between the boss 2 and the through hole 301 is eliminated to clamp the sheet metal 30, and the boss 2 is flanged outward.

[0063] During use, the riveting head 8 abuts against the boss 2. As the equipment travels downward, the boss 2 yields and deforms until it clamps the sheet metal 30; at the same time, under the action of the extrusion force, the leak-proof ring 20 deforms, eliminating the gap and closing the gas-liquid passage. At the same time, the convex ring 3 penetrates into the sheet metal 30, and the outer ring of the convex ring 3 can maintain an annular sealing structure with the sheet metal 30, so it can also play a role in closing the gas-liquid passage.

[0064] Embodiment Three

[0065] A welding and riveting assembly includes a sheet metal 30 and the above-mentioned fastener. The sheet metal 30 is provided with a through hole 301. The convex ring 3 is adapted to be welded to the sheet metal 30 so that the sheet metal 30 fits against the support surface 11. The convex platform 2 is adapted to extend into the through hole 301 and is adapted to deform to fasten the sheet metal 30, so that the leak-proof ring 20 deforms, eliminating the gap between the convex platform 2 and the through hole 301.

[0066] Specifically, there are two ways to achieve this:

[0067] ① Weld first and then rivet

[0068] Refer to Figure 8 、 Figure 9 , the convex ring 3 is used as a welding leg, and its main function is to be welded to the sheet metal 30 after being energized. Before welding, the fastener is placed on the sheet metal 30, and the convex ring 3 fits against the sheet metal 30; the ordinary electrode 6 is in planar contact with the sheet metal 30, and the convex ring 3, the sheet metal 30, and the electrode 6 form a current path. Under the action of resistance heat and pressure, the convex ring 3 is welded to the sheet metal 30 together, eliminating the gap and closing the gas-liquid channel.

[0069] After welding is completed, the riveting process is then adopted. The riveting head 8 acts on the convex platform 2. As the equipment travels downward, the convex platform 2 yields and deforms until it fastens the sheet metal 30. At the same time, under the action of the extrusion force, the leak-proof ring 20 deforms, eliminating the gap and closing the gas-liquid channel.

[0070] ② Welding and riveting are completed simultaneously:

[0071] Refer to Figure 9 , the convex ring 3 is used as a welding leg, and its main function is to be welded to the sheet metal 30 after being energized. Before riveting and welding, the fastener is placed on the sheet metal 30, and the convex ring 3 fits against the sheet metal 30.

[0072] The riveting and welding process is realized by the riveting and welding die 40 to fix the sheet metal 30 and the fastener together. Refer to Figure 10 、 Figure 11 , the riveting and welding die 40 includes an electrode 6, an insulating sleeve 7, and a riveting head 8.

[0073] The electrode 6 is provided with a receiving groove 61. When the electrode 6 contacts the sheet metal 30, it is adapted to form a current path among the sheet metal 30, the electrode 6, and the convex ring 3, so that the convex ring 3 is welded to the sheet metal 30; the electrode 6 is preferably made of copper with good electrical conductivity.

[0074] The insulating sleeve 7 is placed in the receiving groove 61, and the insulating sleeve 7 is provided with a mounting groove 71; the insulating sleeve 7 is preferably an insulator with a certain toughness and hardness. The insulating sleeve 7 is arranged between the electrode 6 and the riveting head 8 to isolate the two to prevent current shunting during welding.

[0075] The riveting head 8 is located at the bottom of the installation groove 71 and is provided with a riveting portion extending out of the installation groove 71. The outer wall dimension of the riveting portion gradually increases along the direction close to the bottom of the installation groove 71, roughly presenting a volcanic shape. The boss 2 is adapted to extend into the riveting groove 21 and abut against the groove wall of the riveting groove 21 to deform the boss 2. The riveting head 8 is preferably made of die steel with good hardness and wear resistance.

[0076] During use, the riveting head 8 abuts against the boss 2. As the equipment travels downward under pressure, the boss 2 yields and deforms until the sheet metal 30 is fastened; at the same time, under the action of the extrusion force, the leak-proof ring 20 deforms to eliminate the gap and close the gas-liquid passage.

[0077] Meanwhile, the electrode 6 is in planar contact with the sheet metal 30, and the boss 3, the sheet metal 30, and the electrode 6 form an electric current path. Under the action of the resistance heat and pressure, the boss 3 and the sheet metal 30 are welded together to eliminate the gap and close the gas-liquid passage.

[0078] The descriptions of the above specification and embodiments are used to explain the protection scope of the present invention, but do not constitute a limitation to the protection scope of the present invention. Through the inspiration of the present invention or the above embodiments, those of ordinary skill in the art, in combination with common general knowledge, ordinary technical knowledge in the art, and / or the prior art, can obtain modifications, equivalent replacements, or other improvements to the embodiments of the present invention or some of its technical features through logical analysis, reasoning, or limited experiments, which should all be included within the protection scope of the present invention.

Claims

1. A fastener, characterized in that: include The body (10) comprises a main body (1), a boss (2), and a convex ring (3); the main body (1) is provided with a supporting surface (11); the boss (2) protrudes from the supporting surface (11) and is provided with a rivet groove (21); the convex ring (3) is annular, protrudes from the supporting surface (11) and is arranged around the boss (2), and its cross-sectional size gradually decreases in a direction away from the supporting surface (11); the convex ring (3) is provided with a plurality of anti-rotation grooves (31), and there is a gap between the anti-rotation grooves (31) and the outer surface of the convex ring (3); The anti-leakage ring (20) is sleeved outside the boss (2).

2. A fastener according to claim 1, characterized in that: The cross section of the convex ring (3) is triangular, and the inclination angle of the convex ring (3) away from the boss (2) is smaller than the inclination angle of the convex ring (3) close to the boss (2).

3. A fastener according to claim 1, characterized in that: The main body (1) is provided with a material containing groove (12), and the material containing groove (12) opens to the supporting surface (11) and is arranged in close contact with and around the boss (2).

4. A fastener according to claim 1, characterized in that: The boss (2) is located in the middle of the supporting surface (11), and the convex ring (3) is located at the outer edge of the supporting surface (11).

5. A fastener according to claim 1, characterized in that: The main body (10) is further provided with a screw hole (4), and the screw hole (4) is communicated with the riveting groove (21).

6. A fastener according to claim 1, characterized in that: The main body (10) is further provided with a screw rod (5), and the screw rod (5) protrudes from a side of the main body (1) away from the supporting surface (11), or protrudes from the bottom of the riveting groove (21).

7. A fastener according to claim 1, characterized in that: The outer wall of the boss (2) is provided with a limiting tooth (22), and the leak-proof ring (20) is suitable for engaging with the limiting tooth (22).

8. A riveting assembly, characterized in that: It comprises a sheet metal (30) and a fastener as described in any one of claims 1 to 7, wherein the sheet metal (30) is provided with a through hole (301), the convex ring (3) is suitable for piercing the sheet metal (30) so that the sheet metal (30) fits the support surface (11) and the sheet metal (30) fills the anti-rotation groove (31); the boss (2) is suitable for extending into the through hole (301) and is suitable for deforming to fasten the sheet metal (30), so that the anti-leakage ring (20) is deformed, so that the gap between the boss (2) and the through hole (301) is eliminated.

9. A welding and riveting assembly, characterized in that: It comprises a sheet metal (30) and a fastener as described in any one of claims 1 to 7, wherein the sheet metal (30) is provided with a through hole (301), the convex ring (3) is suitable for being welded to the sheet metal (30) so that the sheet metal (30) fits the support surface (11), and the boss (2) is suitable for extending into the through hole (301) and being suitable for deforming to fasten the sheet metal (30), so that the anti-leakage ring (20) is deformed, so that the gap between the boss (2) and the through hole (301) is eliminated.

10. A welding riveting die, characterized in that: It is suitable for fixing a sheet metal (30) and a fastener as claimed in any one of claims 1 to 7 together, the sheet metal (30) is provided with a through hole (301) suitable for the boss (2) to extend into, and the welding riveting mold (40) comprises The electrode (6) is provided with a receiving groove (61) and is suitable for forming a current path among the sheet metal (30), the electrode (6) and the convex ring (3) when contacting the sheet metal (30), so that the convex ring (3) and the sheet metal (30) are welded; An insulating sleeve (7), which is placed in the accommodating groove (61) and is provided with a mounting groove (71); A rivet head (8) is located at the bottom of the mounting groove (71) and is provided with a riveted portion extending out of the mounting groove (71), wherein the outer wall size of the riveted portion gradually increases along the groove bottom close to the mounting groove (71), and the rivet head (8) is suitable for extending into the riveted groove (21) and abutting against the groove wall of the riveted groove (21) to deform the boss (2).

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