A ring groove rivet connecting pair suitable for thin plate pre-burying and a riveting method thereof

Abstract

The application discloses a ring groove rivet connecting pair suitable for thin plate pre-burying and a riveting method thereof. The connecting pair comprises a rivet and a sleeve ring. The rivet is composed of a nail core and a pre-burying sleeve coaxially sleeved. The nail core comprises a head, a light pole and a locking groove arranged in sequence on a core rod. The pre-burying sleeve is a sleeve structure and comprises a flange, a pre-burying area and an assembling area arranged in sequence. The pre-burying area has an inner diameter larger than that of the assembling area, and a thinning structure is formed on a cylinder wall of the pre-burying area. The sleeve ring is a sleeve structure and comprises a flange and a deformation area. The riveting method comprises pre-burying and fastening connecting steps. The connecting pair has better fastening connecting effect, can effectively prevent the nut from being loose due to the nut being separated from the connecting member under long-term vibration and other working conditions, has higher installation efficiency, and is simple and convenient in installation tools, reduces a rotating mechanism, eliminates the step of rotating in and out of the thread of a traditional tool, has advantages in volume, weight and cost, and is higher in energy utilization rate.

Description

Technical Field

[0001] This invention belongs to the field of fastener design and manufacturing technology, and relates to the field of thin plate pre-embedded fastening connection technology, and particularly to a ring groove rivet connection pair suitable for thin plate pre-embedding and its riveting method. Background Technology

[0002] In the production of automobiles, rail vehicles, and other vehicles, it is often necessary to pre-embed bolts in thin sheet metal for the installation of other accessories. Generally, for this type of work, bolts are spot-welded onto the thin sheet, and nuts are then used to tighten the accessories later. However, welding can cause deformation of the thin sheet, and the nuts installed later are prone to loosening under long-term vibration, leading to failure of the accessory fastening connection or even detachment. Furthermore, when welding aluminum alloy or carbon fiber sheets is difficult, the installation of accessories becomes more complicated. Some methods involve gluing or directly casting the accessories, which is unreliable and uneconomical. Summary of the Invention

[0003] This invention discloses a ring groove rivet connection pair suitable for pre-embedding in thin plates and its riveting method, addressing the shortcomings of existing technologies. The purpose of this invention is to provide a fastening connection method that is more convenient than welding pre-embedding, applicable to various materials, and has good anti-loosening performance, reducing the difficulty of pre-embedding studs in thin plates, improving work efficiency, and effectively preventing loosening after installation.

[0004] This invention is achieved through the following technical solution:

[0005] A ring groove rivet connection pair suitable for pre-embedded thin plates includes a rivet and a collar, characterized in that: the rivet is composed of a rivet core and a pre-embedded sleeve that are coaxially fitted;

[0006] The nail core includes a cap, a smooth rod, and a locking groove arranged sequentially on the core rod;

[0007] The embedded sleeve is a sleeve structure, including a flange, an embedded area and an assembly area arranged in sequence; the assembly area has an inner diameter that mates with the nail core rod; the inner diameter of the embedded area is larger than the inner diameter of the assembly area, forming a thinned structure of the embedded area cylinder wall, which is used to achieve pre-assembly and fixation with the connecting parts by riveting, folding bulge and mating with the flange during riveting.

[0008] The collar is a sleeve structure, including a flange and a deformation zone; the deformation zone has an inner diameter that mates with the locking groove of the nail core.

[0009] Furthermore, the wall thickness of the sleeve in the pre-embedded area is 1 / 5 to 1 / 2 of the wall thickness of the sleeve in the assembly area.

[0010] Furthermore, the front end of the collar deformation zone is provided with an extended cylindrical positioning zone. The inner diameter of the cylindrical positioning zone is the same as the inner diameter of the deformation zone, and the outer diameter of the cylindrical positioning zone is less than or equal to the inner diameter of the pre-embedded area of ​​the pre-embedded sleeve. The axial length of the cylindrical positioning zone is less than the length of the pre-embedded area of ​​the pre-embedded sleeve.

[0011] Furthermore, the rivet core is a pull-out type riveting rivet core or a short-tail type riveting rivet core; the pull-out type riveting rivet core also includes a pull-out groove and a tail tooth; the short-tail type riveting rivet core also includes a short tail tooth.

[0012] Furthermore, the pre-embedded fitting area is interference-fitted or threaded with the nail core rod.

[0013] Furthermore, the pre-embedded assembly area and / or the outer periphery of the pre-embedded area adopt a hexagonal or knurled structure.

[0014] Furthermore, the length of the nail core rod is greater than or equal to the length of the pre-embedded fitting area, but less than the sum of the lengths of the pre-embedded fitting area and the pre-embedded area.

[0015] The present invention also discloses the above-mentioned riveting method for the ring groove rivet connection pair applicable to the pre-embedded thin plate, including the following steps;

[0016] Pre-embedded sleeve;

[0017] (1) Pass the rivet containing the rivet core and the embedded sleeve through the pre-made mounting hole of the thin plate;

[0018] (2) Insert the appropriate rivet gun from the tail onto the rivet and make the front end of the rivet gun head contact the end face of the pre-embedded sleeve;

[0019] (3) Start the rivet gun to apply axial tension to the rivet, the chuck grips the rivet tail tooth and pulls it backward, so that the rivet head applies axial load to the pre-embedded area through the assembly area of ​​the pre-embedded sleeve. The pre-embedded area undergoes plastic deformation after being subjected to axial load until the special tool reaches the set pressure, and the folding bulge forming of the pre-embedded area cylinder wall thinning structure is completed, and the thin plate is clamped.

[0020] (4) Complete the pre-embedding and remove the riveting gun;

[0021] Fastening connection;

[0022] (5) The parts to be connected are passed through the pre-drilled holes onto the pre-embedded rivets; when using a collar with a positioning area, the pre-drilled holes should be larger than the outer diameter of the collar's positioning area and the positioning area should be embedded into the pre-embedded area of ​​the pre-embedded sleeve.

[0023] (6) Place the collar on the outside of the connected parts to ensure good contact between the collar flange and the connected parts, and prepare for riveting;

[0024] (7) Insert the appropriate rivet gun into the rivet tail tooth so that the anvil of the rivet gun contacts the deformation area of ​​the collar;

[0025] (8) Start the rivet gun. The chuck pulls the rivet axially through the tail tooth, causing the anvil and the collar to move relative to each other. The collar deformation area is molded, and the metal on the inner wall of the collar flows into the rivet locking groove to form an unloose connection.

[0026] (9) For short-tail type rivet cores, the rivet gun is withdrawn to complete the riveting; for pull-out type rivet cores, the rivet gun is continued to be pulled until the tail tooth breaks, and then the rivet gun is withdrawn to complete the riveting.

[0027] This invention breaks down the installation process of grooved rivets to achieve a secure connection of pre-embedded studs in thin plates. The invention involves passing the pre-embedded grooved rivet through a pre-drilled hole in the thin plate, using a special tool to pull the tail tooth of the rivet core. Axial tensile force is transmitted through the mating area between the rivet core and the pre-embedded sleeve, deforming the pre-embedded area of ​​the sleeve to form the grooved rivet structure. Further, the parts to be connected and the collar are sequentially threaded onto the grooved rivet. The tail tooth of the rivet core is pulled again using a special tool, and the anvil of the tool molds the deformed area of ​​the collar. The inner metal wall of the collar forms an unremovable plastic deformation connection with the locking groove of the grooved rivet.

[0028] Advantages of this invention: Compared to existing pre-embedded studs, the connector of this invention provides a better fastening effect, effectively preventing the nut from coming loose under long-term vibration and other working conditions after the components are connected. Simultaneously, compared to existing riveted studs, this technology provides a more stable preload force. Existing riveted studs suffer from significant preload force fluctuations due to bolt installation techniques, typically ranging from 10% to 50%. The connector of this invention, by generating preload force through axial molding, can control preload force fluctuations to within 5%, and it remains unchanged regardless of different operators. Compared to existing pre-embedded studs, the connector of this invention offers higher installation efficiency and simpler, more convenient installation tools, eliminating the traditional steps of screwing in and out of threads, thus improving installation efficiency by 20%. The installation tools used in the connector of this invention reduce the rotation mechanism, offering advantages in size, weight, and cost, while also achieving higher energy utilization. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the connecting secondary nail core assembly of the present invention.

[0030] Figure 2 This is a schematic diagram of the connecting secondary collar of the present invention.

[0031] Figure 3 This is a schematic diagram of the connecting secondary nail core of the present invention.

[0032] Figure 4 This is a schematic diagram of the pre-embedded sleeve for the connecting part of the present invention.

[0033] Figure 5 This is a schematic diagram of the first structure of the pre-embedded sleeve for the connecting pair of the present invention.

[0034] Figure 6 This is a schematic diagram of the second structure of the pre-embedded sleeve for the connecting pair of the present invention.

[0035] Figure 7 This is a schematic diagram of the third structure of the pre-embedded sleeve for the connecting pair of the present invention.

[0036] Figure 8 This is a schematic diagram of the fourth structure of the pre-embedded sleeve for the connecting pair of the present invention.

[0037] Figure 9 This is a schematic diagram of step one of the pre-embedding process of the connecting sub-plate of the present invention.

[0038] Figure 10 This is a schematic diagram of step two in the pre-embedding process of the connecting sub-plate of the present invention.

[0039] Figure 11 This is a schematic diagram of step three in the pre-embedding process of the connecting sub-plate of the present invention.

[0040] Figure 12 This is a schematic diagram of step four in the pre-embedding process of the connecting sub-plate of the present invention.

[0041] Figure 13 This is a schematic diagram of step one of the fastening process of the connecting pair in this invention.

[0042] Figure 14 This is a schematic diagram of step two in the fastening process of the connecting pair of the present invention.

[0043] Figure 15 This is a schematic diagram of step three in the fastening process of the connecting pair of the present invention.

[0044] Figure 16 This is a schematic diagram of step four in the fastening process of the connecting pair of the present invention.

[0045] Figure 17 This is a schematic diagram of the fastening state of the pull-out type nail core connection of the present invention.

[0046] Figure 18 This is a schematic diagram of the fastening state of the short-tailed nail core of the connecting part of the present invention.

[0047] Figure 19 This is a schematic diagram of another collar structure for the connecting pair of the present invention.

[0048] Figure 20 This is a schematic diagram of the connection and fastening state of another type of collar and pull-out nail core of the present invention.

[0049] Figure 21 This is a schematic diagram of the connection and fastening state of another type of collar and short-tailed nail core of the present invention.

[0050] In the diagram, 1 is a rivet, 1.1 is the rivet core, and 1.2 is the embedded sleeve; 1.1.1 is the cap, 1.1.2 is the smooth rod, 1.1.3 is the locking groove, 1.1.4 is the breakaway groove, and 1.1.5 is the tail thread; 1.2.1 is the embedded flange, 1.2.2 is the embedded area, and 1.2.3 is the assembly area. 2 is a collar, 2.1 is the collar flange, 2.2 is the deformation area, and 2.3 is the positioning area. Detailed Implementation

[0051] The present invention will be further described below with reference to specific embodiments. These specific embodiments are further explanations of the principles of the present invention and are not intended to limit the present invention in any way. Any technology that is the same as or similar to the present invention does not exceed the scope of protection of the present invention.

[0052] This invention is applicable to the ring groove rivet connection pair for pre-embedded thin plates, including a rivet and a collar. The rivet includes two parts: a rivet core and a pre-embedded sleeve. The rivet core includes a cap, a smooth rod, a locking groove, a tail tooth, etc., arranged in sequence. The pre-embedded sleeve includes a flange, a pre-embedded area, an assembly area, etc. The collar includes a flange, a deformation area, etc.

[0053] like Figure 1 , Figure 3 , Figure 4 As shown, the embedded sleeve is a sleeve structure, including a flange, an embedded area, and an assembly area arranged in sequence; the assembly area has an inner diameter that mates with the nail core rod; the inner diameter of the embedded area is larger than the inner diameter of the assembly area, forming a thinned structure of the embedded area cylinder wall, which is used to achieve pre-assembly and fixation with the connecting parts by riveting, folding the bulge, and mates with the flange during riveting.

[0054] In this embodiment, the rivet core can be a pull-out type riveting rivet core or a short-tail type riveting rivet core; the pull-out type riveting rivet core also includes a pull-out groove and a tail tooth; the short-tail type riveting rivet core also includes a short tail tooth.

[0055] In this embodiment, the pre-embedded fitting area and the nail core rod have a clearance or interference fit. The length of the nail core rod is equal to the length of the pre-embedded fitting area.

[0056] like Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, the pre-embedded assembly area and / or the outer perimeter of the pre-embedded area adopt a hexagonal or knurled structure. Figure 5 The outer perimeter of the embedded area of ​​the embedded sleeve is hexagonal. Figure 6 The outer perimeter of the embedded area of ​​the embedded sleeve is knurled. Figure 7 The outer surface of the pre-embedded sleeve is a cylindrical shape without patterns. Figure 8 The outer surface of the embedded sleeve is hexagonal.

[0057] As shown in the figure, the flange of the embedded sleeve is used to contact the thin plate and clamp the thin plate together with the drum structure formed by the embedded area to realize the embedded function; the embedded area of ​​the embedded sleeve undergoes plastic deformation after being subjected to axial tensile force to form a drum structure, which, together with the flange, clamps and fixes the thin plate to realize the embedded function.

[0058] As shown in the figure, the assembly area of ​​the embedded sleeve enables the assembly of the nail core and the embedded sleeve, and when the nail core is subjected to axial load, it transfers the axial load to the embedded area, causing the embedded area to deform. Compared with the wall thickness of the assembly area, the metal wall thickness of the embedded area is generally 1 / 5 to 1 / 2 of the thickness of the assembly area; benefiting from the relatively thinner wall thickness, the embedded area deforms first when subjected to the axial load transferred from the assembly area by the nail core, and eventually forms a drum-shaped structure as the load gradually increases.

[0059] When the embedded metal material is subjected to axial pressure, it undergoes yield deformation. During this process, because the outer wall metal of the embedded pipe has a larger volume than the inner wall metal, meaning it has more metal grains, the pressure on an individual grain is lower. In other words, the stress on the metal gradually decreases from the inner wall outwards. Therefore, during plastic deformation, the metal always flows towards the side with lower pressure, thus ensuring outward folding and bulging. Furthermore, factors such as the forging flow line and draft angle during the production process further contribute to the outward folding and bulging result.

[0060] The ability of the pre-embedded area to achieve stable clamping is based on the aforementioned bulging deformation. Through research and testing, the axial force required to be applied by the installation tool is obtained. This axial force is below the yield point of the bending bulging area, approximately 75% of the yield strength, ensuring stable clamping.

[0061] The outer periphery of the embedded area adopts hexagonal or knurled designs to further prevent rotation when subjected to rotational loads or torques after the embedded area forms a bulging structure. Different embedded sleeve and embedded area structure designs can be adopted according to different operating conditions. When there is minimal rotational load or torque, a cylindrical structure can be used to reduce the difficulty of drilling and manufacturing the embedded sleeve; generally, the outer diameter of the embedded area is consistent with that of the assembly area. When subjected to slight rotational loads or torques, a knurled structure can be used. Knurling increases the friction between the inner hole and the contact surface and the embedded area, thus preventing rotation. The knurled structure of the embedded area generally has an outer diameter slightly larger than that of the assembly area and uses triangular tooth tips to ensure sufficient friction to meet operating requirements. This structure also relatively reduces drilling difficulty, facilitating production. When subjected to larger rotational loads or torques, a hexagonal structure can be used. The special properties of the hexagonal structure fix the relative position of the embedded sleeve and the connected plate, preventing the rivet from rotating in principle. The hexagonal structure generally uses a hexagon tangent to the outer diameter of the assembly area to reduce manufacturing difficulty and cost. To further simplify the manufacturing process, the assembly area can adopt a hexagonal structure with the same dimensions as the embedded area.

[0062] like Figure 2 , Figure 19 As shown, the collar is a sleeve structure, including a flange and a deformation zone; the deformation zone has an inner diameter that mates with the locking groove of the nail core. Figure 19 The system also includes a positioning area.

[0063] The collar flange is used to contact the connected parts and, together with the pre-embedded rivets, to complete the fastening connection of the connected parts; it also has a certain function of protecting the connected parts. The deformation zone is located at the front end of the collar, which comes into contact with the anvil of the riveting tool during installation. Under the compression of the anvil, axial and radial plastic deformation occurs, mainly manifested in a decrease in outer diameter and the inner wall metal flowing into the locking groove of the pre-embedded rivets, forming a plastic locking structure, with a slight extension in axial length.

[0064] like Figure 19 As shown, an extended cylindrical positioning area is provided at the front end of the collar deformation zone. The inner diameter of the cylindrical positioning area is the same as the inner diameter of the deformation zone, and the outer diameter of the cylindrical positioning area is less than or equal to the inner diameter of the pre-embedded area of ​​the pre-embedded sleeve. The axial length of the cylindrical positioning area is less than the length of the pre-embedded area of ​​the pre-embedded sleeve. The collar is further provided with a positioning area that can pass through the pre-made hole of the connected part and be inserted into the gap of the pre-embedded sleeve of the rivet, preventing the gap between the connected part and the rivet core from being too large and slipping under vibration conditions, thus further positioning and stabilizing the fastening.

[0065] This invention relates to the installation process of pre-embedded annular groove rivet connections in thin plates, which includes two main steps. For example... Figures 9 to 12 As shown, the pre-embedding steps of the pre-embedded sleeve are illustrated using a tensile-type riveting nail core as an example; Figures 13 to 17 As shown, the fastening connection steps are illustrated using a pull-out type riveting core and a collar without a positioning zone.

[0066] Thin plate pre-embedding steps: Insert the rivet assembly into the pre-made mounting hole in the thin plate, then insert the rivet tail into the rivet gun head until the front of the gun head presses against the pre-embedded sleeve flange. Start the riveting tool to apply an axial tensile load to the rivet. Under the action of the axial force, the rivet core moves outward, and the rivet core head squeezes the pre-embedded area of ​​the pre-embedded sleeve through the assembly area of ​​the pre-embedded sleeve, causing the pre-embedded area to deform and clamp the thin plate. When the pressure or stroke set by the riveting tool is reached, the rivet gun automatically withdraws, completing the rivet pre-embedding of the thin plate.

[0067] Connection and fastening steps: Pass the components and collar to be connected sequentially onto the pre-embedded rivets. After changing the molding gun head, insert the rivet tail tooth into the rivet gun head until the anvil of the gun head presses against the front end of the collar's deformation zone. Start the riveting tool, applying an axial tensile load to the rivet. The relative movement between the rivet gun anvil and the rivet molds the collar's deformation zone, causing the metal on the inner wall of the collar to flow into the locking groove of the pre-embedded rivet, forming a permanent, unloose connection. When the riveting tool reaches the set pressure or stroke, the tail tooth breaks off from the breakage groove. For short-tailed structures, it may not break off. The rivet gun automatically withdraws, completing the connection and fastening process.

[0068] Figure 18 This is a schematic diagram of the fastening state of the short-tailed nail core of the connecting part of the present invention. Figure 19 This is a schematic diagram of the collar structure for setting the positioning area in the connecting pair of the present invention. Figure 20 This is a schematic diagram of the connection and fastening state of the positioning area collar and the pull-out type nail core of the present invention. Figure 21 This is a schematic diagram of the connection and fastening state of the positioning area collar and the short-tailed nail core of the present invention.

Claims

1. A ring groove rivet connection pair suitable for pre-embedded thin plates, comprising a rivet and a collar, characterized in that: The rivet consists of a coaxially fitted rivet core and a pre-embedded sleeve; The nail core includes a cap, a smooth rod, and a locking groove arranged sequentially on the core rod; The embedded sleeve is a sleeve structure, including a flange, an embedded area and an assembly area arranged in sequence; the assembly area has an inner diameter that mates with the nail core rod; the inner diameter of the embedded area is larger than the inner diameter of the assembly area, forming a thinned structure of the embedded area cylinder wall, which is used to achieve pre-assembly and fixation with the connecting parts by riveting, folding bulge and mating with the flange during riveting. The collar is a sleeve structure, including a flange and a deformation zone; the deformation zone has an inner diameter that mates with the locking groove of the nail core.

2. The ring groove rivet connection pair suitable for pre-embedded thin plates according to claim 1, characterized in that: The wall thickness of the sleeve in the pre-embedded area is 1 / 5 to 1 / 2 of the wall thickness of the sleeve in the assembly area.

3. The ring groove rivet connection pair suitable for pre-embedded thin plates according to claim 2, characterized in that: The front end of the collar deformation zone is provided with an extended cylindrical positioning zone. The inner diameter of the cylindrical positioning zone is the same as the inner diameter of the deformation zone, and the outer diameter of the cylindrical positioning zone is less than or equal to the inner diameter of the pre-embedded area of ​​the pre-embedded sleeve. The axial length of the cylindrical positioning zone is less than the length of the pre-embedded area of ​​the pre-embedded sleeve.

4. The ring groove rivet connection pair suitable for pre-embedded thin plates according to claim 3, characterized in that: The rivet core is a pull-out type riveting rivet core or a short-tail type riveting rivet core; the pull-out type riveting rivet core also includes a pull-out groove and a tail tooth; the short-tail type riveting rivet core also includes a short tail tooth.

5. The ring groove rivet connection pair suitable for pre-embedded thin plates according to claim 3, characterized in that: The pre-embedded fitting area is interference-fitted or threaded with the nail core rod.

6. The annular groove rivet connection pair suitable for pre-embedded thin plates according to claim 3, characterized in that: The pre-embedded assembly area and / or the outer periphery of the pre-embedded area adopt a hexagonal or knurled structure.

7. The ring groove rivet connection pair suitable for pre-embedded thin plates according to claim 3, characterized in that: The length of the nail core rod is greater than or equal to the length of the pre-embedded fitting area, but less than the sum of the lengths of the pre-embedded fitting area and the pre-embedded area.

8. A riveting method for pre-embedded annular groove rivet connections in thin plates, characterized in that: The connection pair according to any one of claims 1 to 7 includes the following steps; Pre-embedded sleeve; (1) Pass the rivet containing the rivet core and the embedded sleeve through the pre-made mounting hole of the thin plate; (2) Insert the appropriate rivet gun from the tail onto the rivet and make the front end of the rivet gun head contact the end face of the pre-embedded sleeve; (3) Start the rivet gun to apply axial tension to the rivet, the chuck grips the rivet tail tooth and pulls it backward, so that the rivet head applies axial load to the pre-embedded area through the assembly area of ​​the pre-embedded sleeve. The pre-embedded area undergoes plastic deformation after being subjected to axial load until the special tool reaches the set pressure, and the folding bulge forming of the pre-embedded area cylinder wall thinning structure is completed, and the thin plate is clamped. (4) Complete the pre-embedding and remove the rivet gun; Fastening connection; (5) The parts to be connected are passed through the pre-drilled holes onto the pre-embedded rivets; when using a collar with a positioning area, the pre-drilled holes should be larger than the outer diameter of the collar's positioning area and the positioning area should be embedded into the pre-embedded area of ​​the pre-embedded sleeve. (6) Place the collar on the outside of the connected parts to ensure good contact between the collar flange and the connected parts, and prepare for riveting; (7) Insert the appropriate rivet gun into the rivet tail tooth so that the anvil of the rivet gun contacts the deformation area of ​​the collar; (8) Start the rivet gun. The chuck pulls the rivet axially through the tail tooth, causing the anvil and the collar to move relative to each other. The collar deformation area is molded, and the metal on the inner wall of the collar flows into the rivet locking groove to form an unloose connection. (9) For short-tail type rivet cores, the rivet gun is withdrawn to complete the riveting; for pull-out type rivet cores, the rivet gun is continued to be pulled until the tail tooth breaks, and then the rivet gun is withdrawn to complete the riveting.

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