High-strength closed type locking rivet and manufacturing method thereof

Abstract

The invention relates to the technical field of rivets, in particular to a high-strength closed type locking rivet and a manufacturing method thereof.The high-strength closed type locking rivet comprises a rivet core assembly, a rivet core head is arranged at the left end of the rivet core assembly, a sealing rubber ring and a tooth part are arranged at the left end of the outer surface of the rivet core assembly, and a fracture groove is formed in the left end of the rivet core assembly; the right end of the rivet body assembly is provided with a countersunk head, the left side of the countersunk head is bonded with a sealing ring, and the outer surface of the rivet body assembly is provided with an anti-loosening hook thorn. According to the rivet, the fracture resistance during rivet pulling can be ensured, the rivet core is prevented from being snapped or left in advance, the strength and environmental adaptability are both considered, the sealing performance is better, circumferential rotation can be prevented during rivet pulling, and the strength of the locking rivet can be enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of rivets, in particular to a high-strength closed-type locking rivet and a manufacturing method thereof. Background Art

[0002] A rivet is a metal fastener that connects two parts with through-holes by using its own deformation or interference fit. One end has a cap, while the other end deforms to secure it. A rivet typically consists of a head and a shank. During installation, the tail is deformed (e.g., upsetting or bending) using tools or external force, thereby firmly connecting the parts.

[0003] At present, traditional rivets in high-strength, high-reliability scenarios suffer from insufficient connection strength, poor anti-loosening performance, and weak sealing ability. For example, the tail of an open-type blind rivet is open after riveting and is fixed only by the friction force after the rivet body expands. There is no additional anti-loosening structure. Under vibration and impact loads, the friction force is easily attenuated, causing the rivet to loosen or even fall off (such as when the car chassis is shaken for a long time). The open structure cannot prevent the intrusion of liquid, gas or dust (such as when seawater leaks at the connection of the ship deck), which affects the development and promotion of rivets. To this end, we propose a high-strength closed-type locking rivet and a manufacturing method thereof. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-strength closed locking rivet and a manufacturing method thereof, which has the advantages of high-strength sealing and solves the problems of insufficient connection strength, poor anti-loosening performance and weak sealing ability of traditional rivets in high-strength and high-reliability scenarios.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-strength closed-type locking rivet, comprising: A nail core assembly, wherein the left end of the nail core assembly is provided with a nail core head, the left end of the outer surface of the nail core assembly is provided with a sealing rubber ring and a tooth portion, and the left end of the nail core assembly is provided with a fracture groove; A rivet body assembly, wherein a countersunk head is provided at the right end of the rivet body assembly, a sealing ring is bonded to the left side of the countersunk head, an anti-loosening hook is provided on the outer surface of the rivet body assembly, and an inner cavity of the rivet body assembly is provided with a movable section, a deformable section, and a toothed section from left to right in sequence; A workpiece, wherein the inner surface of the workpiece is provided with a through hole adapted to the rivet body component.

[0006] Preferably, a thread groove is provided at the right end of the nail core assembly.

[0007] Preferably, there are multiple anti-loosening hooks, which are distributed at equal angles on the outer surface of the rivet body assembly, and the distribution position of the anti-loosening hooks corresponds to the right end of the deformation section.

[0008] Preferably, a triangular groove is provided at the middle end of the deformation section.

[0009] Preferably, the tooth pattern portion is adapted to the tooth portion.

[0010] Preferably, an annular groove is provided at one end of the fracture groove.

[0011] Preferably, a reinforcing rod is provided on the left side of the interior of the deformation section, a guide hole is provided on the right side of the interior of the deformation section, and the reinforcing rod slides inside the guide hole.

[0012] A method for manufacturing a high-strength closed-type locking rivet, the manufacturing method comprising the following steps: S1. Material selection: Select appropriate high-strength materials based on usage scenarios and performance requirements; S2. Raw material pretreatment: The core and rivet body components undergo surface cleaning, including degreasing and pickling, to remove the oxide layer. For aluminum alloy materials, annealing can be performed to eliminate internal residual stress and prevent cracking during subsequent processing and forming. S3. The rivet body assembly is formed in the following steps: a1. Cutting and blanking: Cut the selected metal wire according to the required length of the rivet to obtain the rivet body blank; a2. Head preforming: Through the cold heading process, one end of the rivet body is formed into a countersunk head; a3. Middle section processing: Through multi-station die cold heading, anti-loosening hooks are punched out in the middle section of the rivet body; a4. Tail sealing: The tail of the rivet body is sealed by stamping process to form a closed end to ensure the sealing of the rivet; a5. Inner wall thread processing: The metal blank wire is cold headed by the die under the action of the press to directly extrude the inner wall hole, and the thread rolling wheel and the inner hole rolling wheel are used to rotate to roll out the active section, deformation section, triangular groove and tooth pattern in the inner wall hole of the rivet body component; a6. Inner wall punching: Using the deformation section as a positioning reference, punch out a guide hole on one side of the deformation section with the help of a punching needle with ridges, and weld a reinforcing rod on one side of the deformation section; S4. The core assembly is formed into the following steps: b1. Head forming: The nail core head and tooth part are processed into one end of the nail core through cold heading process; b2. Thread groove processing: Use CNC lathe turning or thread rolling technology to process the thread groove on the outer wall of the nail rod; b3. Fracture groove processing: Laser cutting and milling are used to process fracture grooves and annular grooves at the tail of the nail core, which serve as the fracture site during riveting. The groove depth is usually controlled at 1 / 3-1 / 2 of the nail core diameter. S5. Install the sealing rubber ring and sealing ring: Use automated equipment to press the preformed sealing rubber ring and sealing ring into the sealing groove on the outer surface of the left end of the countersunk head and nail core assembly. At the same time, ensure that the sealing ring and the groove wall have an interference fit, and the interference is controlled within 0.1-0.2mm to prevent the rubber pad from shifting during riveting; S6. Assembly: Insert the processed mandrel assembly into the rivet body assembly; S7. Surface treatment: To improve the corrosion resistance and wear resistance of rivets, they can be subjected to surface treatment. Aluminum alloy rivets can be anodized, with a film thickness generally controlled at 10-15μm. Stainless steel rivets can be treated with Dacromet plating or other processes to form a chromium-free corrosion-resistant coating. In addition, molybdenum disulfide can be applied to the thread groove 101 to reduce friction during riveting. S8. Quality Inspection: Use tools such as thread gauges and three-dimensional coordinate measuring machines to test thread fit accuracy; use a tensile testing machine to test breaking force stability; verify sealing through air pressure testing; use a vibration table to test vibration resistance; and place the rivets in a neutral salt spray chamber for salt spray testing to ensure they meet quality standards.

[0013] Preferably, the material of the nail core can be selected from high-strength alloys such as 2024-T4 aluminum alloy and 304 stainless steel, the rivet body can be made of 5052 aluminum alloy and copper alloy, and the sealing rubber pad can be selected from nitrile rubber or silicone rubber according to the requirements of oil resistance and high temperature resistance.

[0014] Preferably, the angle of the barb is greater than or equal to 45°.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can ensure the anti-fracture ability during riveting, avoid the nail core from being pulled off or remaining in advance, take into account both strength and environmental adaptability, and have better sealing performance.

[0016] 2. The present invention can prevent circumferential rotation during riveting and can enhance the strength of the locking rivet. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the present invention from a first viewing angle; Figure 2 This is a schematic diagram of the structure of the present invention from a second viewing angle; Figure 3 Schematic diagram of the expanded structure of the nail core assembly and the rivet body assembly of the present invention; Figure 4 This is a schematic cross-sectional structural diagram of the present invention from a third viewing angle; Figure 5 Schematic diagram of the structure of the nail core assembly and the rivet body assembly when connected to the workpiece; Figure 6It is a structural schematic diagram of the nail core assembly and the rivet body assembly when connecting workpieces according to the present invention.

[0018] In the figure: 1. Nail core assembly; 101. Thread groove; 102. Nail core head; 103. Sealing rubber ring; 104. Tooth portion; 105. Fracture groove; 2. Rivet body assembly; 201. Anti-loosening hook; 202. Countersunk head; 203. Sealing ring; 204. Movable section; 205. Reinforced rod; 206. Deformation section; 207. Guide socket; 208. Tooth portion; 3. Workpiece. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0022] The nail core assembly 1, thread groove 101, nail core head 102, sealing rubber ring 103, tooth portion 104, fracture groove 105, rivet body assembly 2, anti-loosening hook 201, countersunk head 202, sealing ring 203, movable section 204, reinforced insertion rod 205, deformation section 206, guide socket 207, toothed portion 208 and workpiece 3 components of the present application are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or through conventional experimental methods.

[0023] Please refer to Figures 1-6 As shown in the drawings, the present application provides a technical solution: a high-strength closed locking rivet and a manufacturing method thereof, comprising: The left end of the rivet core assembly 1 is provided with a rivet core head 102, the left end of the outer surface of the rivet core assembly 1 is provided with a sealing rubber ring 103 and a tooth portion 104, and the left end of the rivet core assembly 1 is provided with a fracture groove 105. The right end of the rivet body assembly 2 is provided with a countersunk head 202, the left side of the countersunk head 202 is bonded with a sealing ring 203, the outer surface of the rivet body assembly 2 is provided with an anti-loose hook 201, and the inner cavity of the rivet body assembly 2 is sequentially provided with a movable section 204 and a deformation section 206 and a toothed portion 208 from left to right. The inner surface of the workpiece 3 is provided with a through hole matched with the rivet body assembly 2.

[0024] The right end of the rivet core assembly 1 is provided with a threaded groove 101, the number of anti-loose hooks 201 is multiple, and they are distributed at equal angles on the outer surface of the rivet body assembly 2, and the distribution position of the anti-loose hooks 201 corresponds to the right end of the deformation section 206, the middle end of the deformation section 206 is provided with a triangular groove, the toothed portion 208 is matched with the tooth portion 104, one end of the fracture groove 105 is provided with a ring cutting groove, the left side inside the deformation section 206 is provided with a reinforcing plug 205, and the right side inside the deformation section 206 is provided with a guide insertion hole 207, and the reinforcing plug 205 slides inside the guide insertion hole 207.

[0025] The technical solution: when the rivet is used, the end of the rivet core assembly 1 with the threaded groove 101 is sent into the rivet gun, then the rivet body assembly 2 is inserted into the through hole of the workpiece 3, then when the rivet gun is pulled, the rivet body assembly 2 can be moved, and when the rivet body assembly 2 moves, the tooth portion 104, the sealing rubber ring 103 and the rivet core head 102 can also move, and when the tooth portion 104 moves, it can cut into the toothed portion 208, thereby enhancing the connection strength between the rivet body assembly 2 and the rivet core assembly 1, and avoiding the rotational movement of the rivet core assembly 1, then in the case that the rivet core head 102 pulls the left end of the rivet body assembly 2, the sealing rubber ring 103 can seal the right end inside the rivet body assembly 2, and with the assistance of the sealing ring 203 and the surface of the workpiece 3, thereby ensuring the sealing property of the locking rivet, and with the assistance of the triangular groove, the deformation section 206 shrinks inward (such as Figure 5As shown), and with the deformation of the deformation section 206, the anti-loosening hook 201 can be pressed into the surface of the workpiece 3, thereby enhancing the anti-loosening strength of the locking rivet, and when the deformation section 206 contracts inward, the reinforcing rod 205 will move along the guide socket 207, thereby assisting the contraction of the deformation section 206 and ensuring the external standard degree of contraction of the deformation section 206. The material of the reinforcing rod 205 can be carbon steel, and after the reinforcing rod 205 enters the guide socket 207, the strength of the locking rivet can be enhanced. By setting the fracture groove 105 and the annular groove, the sharp corners at the broken part of the nail core component 1 can be avoided, thereby ensuring the flatness of the broken part.

[0026] A method for manufacturing a high-strength closed-type locking rivet, the manufacturing method comprising the following steps: S1. Material selection: Select appropriate high-strength materials based on the usage scenario and performance requirements. The core material can be made of 2024-T4 aluminum alloy or 304 stainless steel. The rivet body can be made of 5052 aluminum alloy or copper alloy. The sealing rubber gasket can be made of nitrile rubber or silicone rubber based on the requirements of oil resistance and high temperature resistance. Specifically, the nail core is made of 2024-T4 aluminum alloy, which can ensure the fracture resistance during riveting and avoid premature breakage or residue of the nail core. The rivet body is made of 5052 aluminum alloy (excellent corrosion resistance) or copper alloy (good conductivity), taking into account both strength and environmental adaptability (such as 5052 aluminum for marine conditions and copper alloy for electronic equipment). The sealing is targeted, nitrile rubber is oil-resistant (suitable for oil tank and oil pipe sealing), and silicone rubber is high-temperature resistant, and the sealing life is optimized according to the scenario.

[0027] S2. Raw material pretreatment: The mandrel component 1 and rivet body component 2 are subjected to surface cleaning treatments including degreasing and pickling to remove the oxide layer. For aluminum alloy materials, annealing can be performed to eliminate internal residual stress and prevent cracking during subsequent processing and forming. Specifically, degreasing and pickling are performed to remove the oxide layer to prevent impurities from affecting the life of the subsequent cold heading die (the oxide scale will cause the die to wear faster), while ensuring the thread groove processing accuracy (impurities may cause incomplete thread profiles), and aluminum alloy annealing treatment (such as 350℃×1h) can reduce internal residual stress and prevent cracking due to stress concentration during cold heading (the cold heading cracking rate of unannealed aluminum alloy is higher).

[0028] S3. The forming of the rivet body component 2 is divided into the following steps: a1. Cutting and blanking: Cut the selected metal wire according to the required length of the rivet to obtain the rivet body blank; a2. Head preforming: Through the cold heading process, one end of the rivet body is formed into a countersunk head 202; a3. Middle section processing: Through multi-station die cold heading, anti-loosening hook 201 is punched out in the middle section of the rivet body, and the angle of the hook is greater than or equal to 45°; a4. Tail sealing: The tail of the rivet body is sealed by stamping process to form a closed end to ensure the sealing of the rivet; a5. Inner wall thread processing: The metal blank wire is cold headed by the die under the action of the press to directly extrude the inner wall hole. The thread rolling wheel and the inner hole rolling wheel are rotated to roll the movable section 204, the deformation section 206, the triangular groove and the tooth pattern 208 in the inner wall hole of the rivet body component 2; a6. Inner wall punching: Using the deformed section 206 as a positioning reference, a guide hole 207 is punched out on one side of the deformed section 206 using a punching needle with ridges, and a reinforcing rod 205 is welded to one side of the deformed section 206; Specifically, a hook angle of ≥45° can be embedded in the hole wall of the riveted part, providing radial pull-out resistance (improved vibration resistance compared to a structure without hooks), suitable for vibration scenarios (such as a car chassis), and the stamping seal forms a physical barrier, which is combined with the subsequent rubber pad to achieve double sealing, with a waterproof rating of up to IP67 (ordinary open rivets are only IP54). The surface hardness of the movable section 204 and the deformation section 206 is enhanced by rolling (the hardness of the aluminum alloy is increased by 15-20HV after rolling), reducing wear during riveting. The triangular grooves and tooth patterns increase the meshing area with the nail core thread, and the anti-loosening effect is significant. The guide socket 207 is stamped based on the deformation section 206 to ensure the position accuracy of the hole and the groove, which is convenient for coaxiality control during subsequent nail core insertion. After the reinforcing rod 205 is welded to the deformation section, it can withstand additional shear force and is suitable for high-load conditions.

[0029] S4. The core assembly 1 is formed into the following steps: b1. Head forming: a nail core head 102 and a tooth portion 104 are formed at one end of the nail core by cold heading process; b2. Processing of thread groove 101: Processing of thread groove 101 on the outer wall of the nail rod by CNC lathe turning or thread rolling process; b3. Processing of fracture groove 105: Laser cutting and milling are used to process fracture groove 105 and annular groove at the tail of the nail core, which serve as the fracture site during riveting. The groove depth is usually controlled at 1 / 3-1 / 2 of the nail core diameter. Specifically, the tooth portion 104 of the mandrel head 102 and the tooth pattern portion 208 of the rivet body deformation section 206 are formed to prevent circumferential rotation during riveting. The groove depth is controlled to 1 / 3-1 / 2 of the diameter to avoid mandrel residue or premature breakage (for example, aviation rivets require a smooth fracture without burrs).

[0030] S5. Installation of the sealing rubber ring 103 and the sealing ring 203: The preformed sealing rubber ring 103 and the sealing ring 203 are respectively pressed into the sealing groove of the countersunk head 202 and the outer surface of the left end of the nail core assembly 1 by automated equipment. At the same time, ensure that the sealing ring 203 and the groove wall are interference fit, and the interference is controlled at 0.1-0.2mm to prevent the rubber pad from shifting during riveting; Specifically, the interference fit of the sealing ring 203 is 0.1-0.2mm. When riveting, it expands under pressure to fill the gap, and the sealing effect is improved compared to the clearance fit. The sealing rubber ring 103 and the sealing ring 203 form an "axial + radial" double seal to prevent liquid from leaking from the gap between the nail core and the rivet body.

[0031] S6 combined assembly: The processed mandrel assembly 1 is inserted into the rivet body assembly 2; Specifically, the nail core is calibrated through visual inspection when inserted into the rivet body to ensure uniform force when riveting and avoid strength attenuation caused by eccentricity.

[0032] S7. Surface treatment: To improve the corrosion resistance and wear resistance of rivets, they can be subjected to surface treatment. Aluminum alloy rivets can be anodized, with a film thickness generally controlled at 10-15μm. Stainless steel rivets can be treated with Dacromet plating or other processes to form a chromium-free corrosion-resistant coating. In addition, molybdenum disulfide can be applied to the thread groove 101 to reduce friction during riveting. Specifically, the thickness of the aluminum alloy anodized film is 10-15μm, and it is corrosion-free after 1000 hours of salt spray test. The stainless steel Dacromet coating is salt spray resistant for ≥2000 hours, is chromium-free and environmentally friendly, and meets the ELV standard of the automotive industry. The thread groove is coated with molybdenum disulfide to reduce the friction coefficient to 0.1-0.15, making the rivet force more uniform and avoiding the nail core from getting stuck.

[0033] S8. Quality Inspection: Use tools such as thread gauges and three-dimensional coordinate measuring machines to test thread fit accuracy; use a tensile testing machine to test breaking force stability; verify sealing through air pressure testing; use a vibration table to test vibration resistance; and place the rivets in a neutral salt spray chamber for salt spray testing to ensure they meet quality standards.

[0034] Specifically, thread gauge testing ensures fitting accuracy and avoids slipping, vibration table testing simulates actual working conditions and exposes potential loosening risks in advance, and salt spray testing verifies corrosion resistance and life to ensure outdoor use.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A high-strength closed-type locking rivet, characterized in that: include: A nail core assembly (1), wherein a nail core head (102) is provided at the left end of the nail core assembly (1), a sealing rubber ring (103) and a tooth portion (104) are provided at the left end of the outer surface of the nail core assembly (1), and a fracture groove (105) is provided at the left end of the nail core assembly (1); A rivet body assembly (2), wherein a countersunk head (202) is provided at the right end of the rivet body assembly (2), a sealing ring (203) is bonded to the left side of the countersunk head (202), an anti-loosening hook (201) is provided on the outer surface of the rivet body assembly (2), and an inner cavity of the rivet body assembly (2) is provided with a movable section (204), a deformable section (206), and a toothed section (208) in sequence from left to right; A workpiece (3) is provided on an inner surface of the workpiece (3) with a through hole adapted to fit the rivet body assembly (2).

2. A high-strength closed-type locking rivet according to claim 1, characterized in that: The right end of the nail core assembly (1) is provided with a thread groove (101).

3. The high-strength closed-type locking rivet according to claim 1, characterized in that: The anti-loosening hooks (201) are multiple in number and are distributed at equal angles on the outer surface of the rivet body component (2), and the distribution position of the anti-loosening hooks (201) corresponds to the right end of the deformation section (206).

4. The high-strength closed-type locking rivet according to claim 1, characterized in that: A triangular groove is provided at the middle end of the deformation section (206).

5. The high-strength closed-type locking rivet according to claim 1, characterized in that: The tooth pattern portion (208) is adapted to the tooth portion (104).

6. The high-strength closed-type locking rivet according to claim 1, characterized in that: One end of the fracture groove (105) is provided with an annular groove.

7. The high-strength closed-type locking rivet according to claim 1, characterized in that: A reinforcing rod (205) is provided on the left side of the interior of the deformation section (206), a guide socket (207) is provided on the right side of the interior of the deformation section (206), and the reinforcing rod (205) slides inside the guide socket (207).

8. A method for producing the high-strength closed-type locking rivet described in any one of 1 to 7, characterized in that: The manufacturing method comprises the following steps: S1. Material selection: Select appropriate high-strength materials based on usage scenarios and performance requirements; S2. Raw material pretreatment: The nail core component (1) and the rivet body component (2) are subjected to surface cleaning treatments including degreasing and pickling to remove the oxide layer. For aluminum alloy materials, annealing treatment can be performed to eliminate internal residual stress to prevent cracking during subsequent processing and forming; S3. The forming of the rivet body component (2) is divided into the following steps: a1. Cutting and blanking: Cut the selected metal wire according to the required length of the rivet to obtain the rivet body blank; a2. Head preforming: forming one end of the rivet body into a countersunk head (202) through a cold heading process; a3. Middle section processing: cold heading with a multi-station die to punch out anti-loosening hooks (201) in the middle section of the rivet body; a4. Tail sealing: The tail of the rivet body is sealed by stamping process to form a closed end to ensure the sealing of the rivet; a5. Inner wall thread processing: cold heading is performed on the metal blank wire by a die under the action of a press to directly extrude the inner wall hole, and a thread rolling wheel and an inner hole rolling wheel are used to rotate to roll out a movable section (204), a deformation section (206), a triangular groove and a tooth pattern (208) in the inner wall hole of the rivet body component (2); a6. Punching holes in the inner wall: using the deformation section (206) as a positioning reference, punching out a guide hole (207) on one side of the deformation section (206) with the aid of a punching needle with ridges, and welding a reinforcing rod (205) on one side of the deformation section (206); S4. The forming of the nail core assembly (1) is divided into the following steps: b1. Head forming: a nail core head (102) and a tooth portion (104) are formed at one end of the nail core by a cold heading process; b2. Processing of thread groove (101): using a CNC lathe or thread rolling process to process a thread groove (101) on the outer wall of the nail rod; b3. Fracture groove (105) processing: laser cutting and milling are used to process the fracture groove (105) and the annular groove at the tail of the nail core, which serves as the fracture site during riveting. The groove depth is usually controlled to be 1 / 3-1 / 2 of the nail core diameter; S5. Installation of the sealing rubber ring (103) and the sealing ring (203): Press the preformed sealing rubber ring (103) and the sealing ring (203) into the sealing groove of the outer surface of the left end of the countersunk head (202) and the nail core assembly (1) through the automated equipment. At the same time, ensure that the sealing ring (203) and the groove wall are interference fit, and the interference is controlled at 0.1-0.2mm to prevent the rubber pad from shifting during riveting; S6. Assembly: Insert the processed mandrel assembly (1) into the rivet body assembly (2); S7. Surface treatment: In order to improve the corrosion resistance and wear resistance of the rivets, they can be surface treated. Aluminum alloy rivets can be treated with anodizing, and the film thickness is generally controlled at 10-15μm; stainless steel rivets can be treated with Dacromet plating and other processes to form a chromium-free corrosion-resistant coating. In addition, molybdenum disulfide can be coated on the thread groove (101) to reduce the friction during riveting. S8. Quality Inspection: Use tools such as thread gauges and three-dimensional coordinate measuring machines to test thread fit accuracy; use a tensile testing machine to test breaking force stability; verify sealing through air pressure testing; use a vibration table to test vibration resistance; and place the rivets in a neutral salt spray chamber for salt spray testing to ensure they meet quality standards.

9. The method for manufacturing a high-strength closed-type locking rivet according to claim 8, characterized in that: The material of the nail core in step S1 can be selected from high-strength alloys such as 2024-T4 aluminum alloy and 304 stainless steel, the rivet body can be made of 5052 aluminum alloy and copper alloy, and the sealing rubber pad can be selected from nitrile rubber or silicone rubber according to the requirements of oil resistance and high temperature resistance.

10. The method for manufacturing a high-strength closed-type locking rivet according to claim 8, characterized in that: In step a3 of step S3, the angle of the barb is greater than or equal to 45°.

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