Riveting piece, riveting structure, riveting die and riveting device

Abstract

The utility model provides a riveting piece, a riveting structure, a riveting die and a riveting device. The riveting piece comprises a riveting head part and a riveting leg part, wherein the riveting leg part extends out from one side of the riveting head part in the axial direction of the riveting head part; the diameter of the riveting head portion ranges from 8 mm to 10 mm, and the thickness of the riveting head portion ranges from 1 mm to 3 mm. And the thickness of the riveting leg part is 1 to 2mm. According to the utility model, the riveting piece comprises the riveting head part and the riveting leg part, the riveting leg part extends out from one side of the riveting head part along the axial direction of the riveting head part, the riveting head part generates plastic deformation and plays a role of a sealing head, and the riveting leg part is used for being riveted and pressed in a material plate, so that a firm mechanical interlocking structure is formed in the material plate; therefore, cracks are reduced, and the self-piercing riveting quality is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of riveting devices, and in particular relates to a riveting piece, a riveting structure, a riveting die and a riveting device. Background Art

[0002] Self-piercing riveting, commonly known as SPR riveting in the industry, is a mechanical cold connection that is completely unaffected by the chemical properties of aluminum alloy materials and can well connect aluminum plates to aluminum plates, and aluminum plates to steel plates. A special riveting die is used to force the connected plates to combine at the connection point through an external rivet under the action of external force, forming a mutually embedded self-locking structure, so that the first and second layers of the plates are tightly connected together. The process is that the punch moves to contact the plate to bend it under pressure and locally plastically deform. When the punch continues to move, the first layer of the plate is compressed and thinned, and at this time, the groove of the die has no constraints on the fillet of the first layer of the plate. The plate flows to the groove under the action of the punching pressure, filling the groove of the die, and at the same time, the material at the fillet of the second layer of the plate flows to the periphery. As most of the first layer of the sheet metal contacts the bottom of the rivet die, under the joint action of the first layer of the sheet metal and the bottom of the rivet die, the riveted part undergoes plastic deformation and gradually expands to the surrounding areas. At the same time, the riveting force continues to increase, causing the first layer of the sheet metal to gradually fill the rivet die, and eventually the riveted legs of the riveted part expand to form a mechanical interlocking structure with the surrounding materials. At the same time, the riveted part forms a firm and tight connection before the first layer of the sheet metal that has not been punched out and the punched second layer of the sheet metal completely fills the rivet die and the first layer of the sheet metal.

[0003] The biggest problem that self-piercing riveting technology usually faces is that it is easy to cause riveting cracks. Due to the large ductility of the material, the easy deformation of the material and the high yield strength ratio, the self-piercing riveted material, especially when the first layer is cast aluminum alloy or extruded aluminum alloy, is very prone to riveting cracks. The appearance of riveting cracks will reduce the durability of the connection and cause riveting failure. Therefore, models equipped with large castings basically use bolt connection and other processes, but bolt connection is heavy, costly, and inefficient, so it is not the best choice. Utility Model Content

[0004] The utility model provides a riveting piece, a riveting structure, a riveting die and a riveting device, so as to solve the problem that the existing riveting piece is prone to riveting cracks when in use.

[0005] A riveted part, comprising a riveted head and a riveted leg extending from one side of the riveted head along the axial direction of the riveted head;

[0006] The diameter of the riveted head is 8-10 mm, the thickness of the riveted head is 1-3 mm; the thickness of the riveted leg is 1-2 mm.

[0007] A riveting structure, comprising a material plate and the riveted part;

[0008] The material plate is used to be placed on the riveting die;

[0009] The riveting piece is used for riveting into the material plate.

[0010] Preferably, a pre-through hole is provided on a side of the material plate away from the riveting die, and the pre-through hole is arranged opposite to the axial direction of the riveting die.

[0011] Preferably, the material plate comprises a first layer plate and a second layer plate;

[0012] The first layer board is used to be placed on the riveting die, the second layer board is arranged on the first layer board, and the pre-via is arranged on the second layer board.

[0013] A riveting die, used for receiving the material plate in the riveting structure;

[0014] The rivet die comprises a rivet die mounting portion and a rivet die forming portion extending from one end of the rivet die mounting portion along the axial direction of the rivet die mounting portion; the rivet die mounting portion is used to be mounted on the rivet die base; the rivet die forming portion is used to receive the material plate;

[0015] The rivet die forming part is provided with a recessed structure, which includes an arc forming area and an arc transition area arranged outside the arc forming area, and the arc radius of the arc forming area is greater than the arc radius of the arc transition area.

[0016] Preferably, the arc radius of the arc forming zone is 19-21 mm; and the arc radius of the arc transition zone is 3-5 mm.

[0017] Preferably, the depth of the recessed structure is 0.7-1.5 mm.

[0018] Preferably, the rivet die forming portion is used to receive a side surface of the material plate and has a ring shape, the inner diameter of the ring is 11 to 13 mm, and the outer diameter of the ring is 17 to 19 mm.

[0019] A riveting device, comprising a riveting gun head and the riveting die, wherein a riveting space is formed between the riveting gun head and the riveting die;

[0020] The riveting structure is arranged in the riveting space, and the riveting structure includes a material plate and the riveting piece;

[0021] The material plate is placed on the riveting die, and the riveting part is placed on the material plate;

[0022] The rivet gun head is used to rivet the riveted part into the material plate.

[0023] Preferably, the riveting device further comprises a riveting die base, the riveting die is installed in the riveting die base, and the rivet gun head is connected to the riveting die base.

[0024] In the utility model, the riveted part includes a riveted head and a riveted leg. The riveted leg extends from one side of the riveted head along the axial direction of the riveted head. The riveted head produces plastic deformation and acts as a head. The riveted leg is used to rivet into the material plate to form a firm mechanical interlocking structure between the material plates, thereby reducing cracking and improving the quality of self-piercing riveting. Based on the actual design requirements, the three indicators of the diameter of the riveted head, the thickness of the riveted head and the thickness of the riveted leg of the riveted part are redesigned accordingly. Since the riveting die is changed from a flat bottom to a round bottom, the space for the riveted part to penetrate the material plate becomes abnormally small, and the riveted part is easy to yield and cannot stretch out. Therefore, the thickness of the riveted leg is thickened and the thickness of the riveted head is thickened to ensure that the riveted part can penetrate the material plate smoothly without yielding. After the pre-through hole is set on the material plate, in order to ensure that the riveted head can tightly clamp the material plate, the diameter of the riveted head is further increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view of the riveted part in the utility model;

[0026] Figure 2 It is the front view of the middle material plate of the utility model;

[0027] Figure 3 It is an isometric view of the riveting die in the utility model;

[0028] Figure 4 It is a cross-sectional view of the riveting die in the utility model;

[0029] Figure 5 It is an application schematic diagram of the riveting device in the utility model.

[0030] Among them, 1. Riveted parts; 11. Riveted heads; 12. Riveted legs; 2. Material plates; 21. Pre-through holes; 22. First layer of plates; 23. Second layer of plates; 3. Riveting molds; 31. Riveting mold mounting parts; 32. Riveting mold forming parts; 33. Concave structure; 331. Arc forming area; 332. Arc transition area; 4. Riveting mold base; 5. Riveting gun head. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0032] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The utility model embodiment provides a riveted part 1, referring to Figure 1 The rivet 1 includes a rivet head 11 and a rivet leg 12 extending from one side of the rivet head 11 along the axial direction of the rivet head 11; the diameter of the rivet head 11 is 8 to 10 mm, the thickness of the rivet head 11 is 1 to 3 mm; the thickness of the rivet leg 12 is 1 to 2 mm.

[0035] As an example, the riveted component 1 includes a riveted head 11 and a riveted leg 12, wherein the riveted leg 12 extends from one side of the riveted head 11 along the axial direction of the riveted head 11, the riveted head 11 undergoes plastic deformation and acts as a head, and the riveted leg 12 is used to be riveted into the sheet 2 to form a firm mechanical interlocking structure between the sheets 2, thereby reducing cracking and improving the quality of self-piercing riveting. The riveted component 1 is a rivet.

[0036] Based on actual design requirements, the diameter of the rivet head 11, the thickness of the rivet head 51, and the thickness of the rivet leg 12 of the rivet 1 are redesigned accordingly. Since the rivet die 3 is changed from a flat bottom to a round bottom, the space where the rivet 1 penetrates the sheet 2 becomes abnormally small, and the rivet 1 easily yields and cannot stretch out. Therefore, the thickness of the rivet leg 12 is thickened and the thickness of the rivet head 11 is thickened to ensure that the rivet 1 can smoothly penetrate the sheet 2 without yielding. After the pre-through hole 21 is set on the sheet 2, in order to ensure that the rivet head 11 can tightly clamp the sheet 2, the diameter of the rivet head 11 is increased. After experimental verification, the size values ​​of the three indicators of the rivet 1 are as follows: Refer to Figure 1 Taking the cross section of the riveted part 1 along the axial direction of the riveted head 11 as the standard, the diameter of the riveted head 11 is H, the thickness of the riveted head 11 is L, the thickness of the riveted leg 12 is K, the diameter of the riveted head 11 is 8 to 10 mm, the thickness of the riveted head 11 is 1 to 3 mm; the thickness of the riveted leg 12 is 1 to 2 mm.

[0037] The utility model embodiment provides a riveting structure, referring to Figure 1 and Figure 2 , including a material plate 2 and a rivet part 1; the material plate 2 is used to be placed on a rivet die 3; the rivet part 1 is used to be riveted into the material plate 2.

[0038] As an example, the riveted structure includes a material plate 2 and a riveted component 1; the material plate 2 is used to be placed on a riveting die 3; the riveted component 1 is used to be riveted into the material plate 2, the riveted component 1 includes a riveted head 11 and a riveted leg 12, the riveted leg 12 extends from one side of the riveted head 11 along the axial direction of the riveted head 11, the riveted head 11 produces plastic deformation and acts as a head, the riveted leg 12 is used to be riveted into the material plate 2, so that a firm mechanical interlocking structure is formed between the material plates 2, thereby reducing cracking and improving the quality of self-piercing riveting.

[0039] In one embodiment, referring to Figure 2 A pre-through hole 21 is provided on the side of the material plate 2 away from the riveting die 3 , and the pre-through hole 21 is arranged opposite to the axial direction of the riveting die 3 .

[0040] As an example, a pre-through hole 21 is provided on the side of the material sheet 2 away from the riveting die 3, and the pre-through hole 21 is arranged opposite to the axial direction of the riveting die 3. In this way, the material sheet 2 does not need more material flow or extrusion during riveting, which further improves the riveting formability and reduces cracking.

[0041] In one embodiment, referring to Figure 2 The material plate 2 includes a first layer plate 22 and a second layer plate 23 ; the first layer plate 22 is used to be placed on the riveting die 3 , the second layer plate 23 is arranged on the first layer plate 22 , and the pre-through hole 21 is arranged on the second layer plate 23 .

[0042] As an example, the material plate 2 includes a first plate 22 and a second plate 23; the first plate 22 is used to be placed on the riveting die 3, and the second plate 23 is arranged on the first plate 22, and the first plate 22 and the second plate 23 are overlapped and directly cut. The pre-through hole 21 is arranged on the second plate 23, and the pre-through hole 21 is arranged relative to the axial direction of the riveting die 3. When riveting, the second plate 23 does not need more material to flow or squeeze downward, which further improves the riveting formability and reduces cracking. Among them, the size of the pre-through hole 21 is designed to be a 6mm round hole.

[0043] The utility model embodiment provides a riveting die 3, referring to Figure 3 and Figure 4 , used to receive the material plate 2 in the riveting structure; the rivet die 3 includes a rivet die mounting portion 31 and a rivet die forming portion 32 extending from one end of the rivet die mounting portion 31 along the axial direction of the rivet die mounting portion 31; the rivet die mounting portion 31 is used to be installed on the rivet die base 4; the rivet die forming portion 32 is used to receive the material plate 2; a recessed structure 33 is provided on the rivet die forming portion 32, the recessed structure 33 includes an arc forming area 331 and an arc transition area 332 arranged on the periphery of the arc forming area 331, and the arc radius of the arc forming area 331 is greater than the arc radius of the arc transition area 332.

[0044] As an example, in the process of self-piercing riveting, the shape and structure of the rivet die 3 play a very important role, directly determining whether the quality of the rivet point is qualified. The rivet die 3 includes a rivet die mounting portion 31 and a rivet die forming portion 32. The rivet die forming portion 32 extends from one end of the rivet die mounting portion 31 along the axial direction of the rivet die mounting portion 31. The rivet die mounting portion 31 and the rivet die forming portion 32 are a complete structure, which is machined as a whole. The rivet die mounting portion 31 plays a connecting role and is used to be installed on the rivet die base 4; the rivet die forming portion 32 is used to receive the material plate 2. The rivet die forming portion 32 is provided with a recessed structure 33, which has the function of realizing the rivet point forming and avoiding the rivet point cracking. The recessed structure 33 includes an arc forming area 331 and an arc transition area 332 arranged on the periphery of the arc forming area 331. The arc radius of the arc forming area 331 is greater than the arc radius of the arc transition area 332. This arrangement changes the conventional flat-bottom rivet die into a round-bottom rivet die, thereby minimizing the resistance to material flow. The deformation displacement of the material flow process in the material sheet 2 is reduced, the flow velocity is increased, the deformation of the material is reduced, the formability is improved, thereby reducing cracking and improving the quality of self-piercing riveting.

[0045] In one embodiment, referring to Figure 3 and Figure 4 The arc radius of the arc forming zone 331 is 19 to 21 mm; the arc radius of the arc transition zone 332 is 3 to 5 mm.

[0046] As an example, refer to Figure 2The arc radius of the arc transition zone 332 is E, the arc radius of the arc transition zone 332 is A, the arc radius of the arc transition zone 332 is 3-5 mm, the arc radius of the arc forming zone 331 is 19-21 mm, the center and edge of the rivet point are transitioned through the arc transition zone 332, and the sharp point is eliminated. Through these two designs, the deformation displacement of the material flow process in the material sheet 2 can be reduced, the flow velocity can be increased, the deformation of the material can be reduced, the formability can be improved, thereby reducing cracking and improving the quality of self-piercing riveting.

[0047] In one embodiment, referring to Figure 3 and Figure 4 , the depth of the concave structure 33 is 0.7-1.5 mm.

[0048] As an example, refer to Figure 4 , the depth of the concave structure 33 is B. The shape of the rivet die 3 directly determines whether the rivet point will crack. The shallower the depth of the rivet die 3, the less material flow and cracking. The depth of the concave structure 33 is 0.7-1.5mm, which can reduce the deformation of the material, prevent cracking, and ensure that the interlocking of the rivet point and the remaining material thickness meet the requirements. Through experimental verification, the depth is designed to be 0.7-1.5mm, which can ensure that under the extrusion action, the plastic deformation of the material is reduced, the extrusion deformation of the grain is small, and a qualified rivet point can be formed.

[0049] In one embodiment, referring to Figure 3 and Figure 4 The riveting die forming part 32 is used to receive one side of the material plate 2 and is in a ring shape. The inner diameter of the ring is 11 to 13 mm, and the outer diameter of the ring is 17 to 19 mm.

[0050] As an example, refer to Figure 4 , the inner diameter of the ring is C, and the outer diameter of the ring is D. The rivet die forming part 32 is used to receive the side of the material plate 2 in a ring shape, the inner diameter of the ring is 11-13 mm, and the outer diameter of the ring is 17-19 mm. By determining these dimensions, it can be ensured that the one-piece die casting and other easy-to-crack parts will not crack after riveting, and the versatility of the rivet die 3 can also be ensured, and it can be applied to various types of riveting guns to ensure the versatility of the equipment.

[0051] The utility model embodiment provides a riveting device, referring to Figure 1-5 , including a rivet gun head 5 and a rivet die 3, a riveting space is formed between the rivet gun head 5 and the rivet die 3; a riveting structure is arranged in the riveting space, and the riveting structure includes a material plate 2 and a riveted part 1; the material plate 2 is placed on the rivet die 3, and the rivet part 1 is placed on the material plate 2; the rivet gun head 5 is used to rivet the rivet part 1 into the material plate 2.

[0052] As an example, the riveting device includes a rivet gun head 5 and a rivet die 3, and a riveting space is formed between the rivet gun head 5 and the rivet die 3; the riveting structure is arranged in the riveting space, and the riveting structure includes a material plate 2 and a riveted part 1, specifically, the material plate 2 is placed on the riveting die 3, and the riveted part 1 is placed on the material plate 2; the rivet gun head 5 is used to rivet the riveted part 1 into the material plate 2. For example, the riveting device is a rivet gun, and the riveted part 1 in the design scheme is pressed into the material plate 2 (i.e., sheet metal) by the pressure of the electrode on the rivet gun, and the material plate 2 is assisted by the riveting die forming part 32 of the riveting die 3 to be deformed into a set shape, wherein the material plate 2 is provided with a pre-through hole 21, so that the deformation of easily cracked materials such as cast aluminum is reduced, so that crack defects will not appear after riveting. The riveting device in this embodiment combines the conventional flat-bottom riveting die with a round-bottom riveting die, the pre-through hole 21 on the material plate 2, and the riveting part 1 with a special size and shape. No additional material processing is required, and the material strength will not be reduced or the thickness of the parts will be increased. It is suitable for riveting of various aluminum alloy materials without cracks. The riveting device in this example has a simple and compact structure and strong versatility. It can be applied to any kind of riveting gun, and can also be directly modified on the existing riveting gun. It can continue to be used after redesign and processing, and can also achieve co-line production. The switching mode of the riveting die 3 and the riveting part 1 is consistent with the switching mode of the existing production line. The pre-through hole 21 of the material plate 2 can be produced in the part production stage. It has strong versatility, especially solving the cracking problem of riveting of large one-piece castings, which is of great practical significance.

[0053] In one embodiment, referring to Figure 5 The riveting device also includes a riveting die base 4, the riveting die 3 is installed in the riveting die base 4, and the rivet gun head 5 is connected to the riveting die base 4.

[0054] As an example, the riveting device also includes a riveting die base 4, the riveting die 3 is installed in the riveting die base 4, and the rivet gun head 5 is connected to the riveting die base 4. Specifically, the riveting die 3 is installed in the riveting die base 4 of the riveting device, which provides convenience for installing the riveting die 3 and the riveting structure.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A riveted part, characterized in that: It includes a riveting head and a riveting leg extending from one side of the riveting head along the axial direction of the riveting head; The diameter of the riveted head is 8-10 mm, the thickness of the riveted head is 1-3 mm; the thickness of the riveted leg is 1-2 mm.

2. A riveted structure, characterized in that: comprising a material plate and the riveted part according to claim 1; The material plate is used to be placed on the riveting die; The riveting piece is used for riveting into the material plate.

3. The riveted structure according to claim 2, characterized in that: A pre-through hole is provided on a side of the material plate away from the riveting die, and the pre-through hole is arranged opposite to the axial direction of the riveting die.

4. The riveted structure according to claim 3, characterized in that: The material plate includes a first layer plate and a second layer plate; The first layer board is used to be placed on the riveting die, the second layer board is arranged on the first layer board, and the pre-via is arranged on the second layer board.

5. A riveting die, characterized in that: Used to receive the material plate in the riveted structure according to any one of claims 2 to 4; The rivet die comprises a rivet die mounting portion and a rivet die forming portion extending from one end of the rivet die mounting portion along the axial direction of the rivet die mounting portion; the rivet die mounting portion is used to be mounted on a rivet die base; The riveting die forming part is used to receive the material plate; The rivet die forming part is provided with a recessed structure, which includes an arc forming area and an arc transition area arranged outside the arc forming area, and the arc radius of the arc forming area is greater than the arc radius of the arc transition area.

6. The riveting die according to claim 5, characterized in that: The arc radius of the arc forming zone is 19-21 mm; the arc radius of the arc transition zone is 3-5 mm.

7. The riveting die according to claim 5, characterized in that: The depth of the concave structure is 0.7-1.5 mm.

8. The riveting die according to claim 5, characterized in that: The riveting die forming part is used to receive a side surface of the material plate and has a ring shape, wherein the inner diameter of the ring is 11 to 13 mm and the outer diameter of the ring is 17 to 19 mm.

9. A riveting device, comprising a riveting gun head and the riveting die according to any one of claims 5 to 8, wherein a riveting space is formed between the riveting gun head and the riveting die; The riveted structure according to any one of claims 2 to 4 is arranged in the riveted space, and the riveted structure comprises a material plate and the riveted part according to claim 1; The material plate is placed on the riveting die, and the riveting part is placed on the material plate; The rivet gun head is used to rivet the riveted part into the material plate.

10. The riveting device according to claim 9, characterized in that: The riveting device also includes a riveting die base, the riveting die is installed in the riveting die base, and the rivet gun head is connected to the riveting die base.

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