Riveting die and riveting die device

Abstract

The utility model relates to a riveting die and a riveting die device. The riveting die comprises an end face and a cavity formed by sinking the end face. The cavity comprises a bottom surface and a side surface, the side surface is connected with the bottom surface and the end surface, the side surface comprises a first arc surface, a second arc surface and a third arc surface, the first arc surface is connected with the end surface and the second arc surface, the third arc surface is connected with the second arc surface and the bottom surface, and the radius of the first arc surface is smaller than that of the second arc surface; the radius of the third arc surface is smaller than that of the second arc surface. According to the riveting die, the first arc face is connected with the end face and the second arc face, so that the corner of the end face and the corner of the second arc face are in smooth transition through the first arc face, and the mobility of a riveting piece in the cavity is improved. The side face comprises the three arc faces, so that the riveting piece has enough advancing space, the mobility of the riveting piece in the riveting process is improved, the cracking risk of the riveting piece is reduced, and the riveting success rate is increased.

Description

Technical Field

[0001] The present application relates to the field of riveting technology, and in particular to a riveting die and a riveting die device. Background Art

[0002] As a new type of cold processing connection technology for sheet metal, self-piercing riveting uses the large plastic deformation of the sheet metal to form a mechanical internal lock to achieve the purpose of connecting riveted parts. Self-piercing riveting has high requirements on the ductility of the metal material in the riveted parts. When the ductility of the riveted parts is low, riveting cracks are prone to occur.

[0003] Therefore, how to reduce the cracking of riveted parts is an urgent problem to be solved. Utility Model Content

[0004] The present application provides a riveting die and a riveting die device, which aim to reduce the defect of riveting cracking of riveted parts to a certain extent.

[0005] In the first aspect, the present application proposes a rivet die, which includes an end face and a cavity formed inwardly from the end face; the cavity includes a bottom face and a side face, the side face connects the bottom face and the end face, the side face includes a first arc surface, a second arc surface and a third arc surface, the first arc surface connects the end face and the second arc surface, the third arc surface is connected to the second arc surface and the bottom face, the radius of the first arc surface is smaller than the radius of the second arc surface, and the radius of the third arc surface is smaller than the radius of the second arc surface.

[0006] In the riveting die provided by the present application, the first arc surface connects the end surface and the second arc surface, so as to realize a smooth transition at the corner of the end surface and the second arc surface through the first arc surface, so as to improve the fluidity of the riveted part in the cavity. The side surface includes three arc surfaces, so that the riveted part has sufficient space to move, and improves the fluidity of the riveted part during the riveting process, reduces the risk of cracking of the riveted part, and improves the success rate of riveting.

[0007] According to an embodiment of the present application, the side surface is not perpendicular to the end surface.

[0008] In these optional embodiments, the side faces are not perpendicular to the end faces, which can increase the contact area between the side faces and the rivet, thereby reducing the pressure and improving the fluidity of the rivet, and can also facilitate demolding of the rivet.

[0009] According to an embodiment of the present application, the first arc surface is a convex surface protruding outward, and the second arc surface is a concave surface recessed inward.

[0010] In these optional embodiments, such an arrangement can increase the flow path of the rivet in the cavity, thereby facilitating the deformation of the rivet.

[0011] According to one embodiment of the present application, the radius of the third arc surface is greater than the radius of the first arc surface.

[0012] In these optional embodiments, the third arc surface connects the second arc surface and the bottom surface to form a wider and thicker transition area to increase the stress-bearing area and reduce the risk of cracking.

[0013] According to one embodiment of the present application, the third arc surface is a concave surface that is recessed inwardly.

[0014] In these optional embodiments, the flowability of the riveted part from the second arc surface to the bottom surface in the cavity is facilitated, and demolding of the riveted part is also facilitated.

[0015] According to an embodiment of the present application, the second arc surface includes a plurality of sub-arc surfaces, and two adjacent sub-arc surfaces are one concave surface that is sunken inwards, and the other is a convex surface that is protruding outwards.

[0016] In these optional embodiments, such an arrangement can effectively increase the flow path of the riveted part.

[0017] According to one embodiment of the present application, the rivet die includes a rivet die body, the rivet die body includes a base and a protective layer, the protective layer is attached to the surface of the base, and the protective layer defines a cavity.

[0018] In these optional embodiments, the protective layer has high hardness and wear resistance, which can reduce wear, extend the service life of the rivet die, and reduce the production cost of the rivet die.

[0019] According to an embodiment of the present application, the protective layer is an aluminum oxide layer, a boron nitride layer, or a titanium carbide layer.

[0020] In these optional embodiments, these have optional materials that allow the protective layer to have a higher hardness and also allow the protective layer to be easily obtained.

[0021] According to one embodiment of the present application, the rivet die includes a rivet die body and a mounting rod, the mounting rod is arranged on a side of the rivet die body away from the cavity, and the mounting rod is connected to the rivet die body.

[0022] In these optional embodiments, the mounting rod is used to fix the rivet die body, which can tighten the rivet die body during riveting and reduce the risk of the rivet die body falling off.

[0023] In a second aspect, the present application provides a riveting die device, comprising the aforementioned riveting die and a driving mechanism, wherein the driving mechanism is used to press the riveted part into the cavity for riveting.

[0024] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0026] Figure 1 It is a structural schematic diagram of a riveting die provided in one embodiment of the present application;

[0027] Figure 2 is a top view of a riveting die provided in one embodiment of the present application;

[0028] Figure 3 It is a left side view of a riveting die provided in one embodiment of the present application;

[0029] Figure 4 is a front view of a riveting die provided in one embodiment of the present application;

[0030] Figure 5 for Figure 4 The schematic diagram of the cross-sectional structure of the rivet die at point aa provided by one embodiment of the present application is shown;

[0031] Figure 6 is a structural schematic diagram of a riveting die provided in another embodiment of the present application;

[0032] Figure 7 It is a partial structural schematic diagram of a riveting die device provided in one embodiment of the present application.

[0033] The drawings are not necessarily drawn to scale.

[0034] Description of reference numerals:

[0035] 100, riveting die; 10, riveting die body; 11, end face; 12, cavity; 121, bottom face; 122, side face; 1221, first arc face; 1222, second arc face; 12221, sub-arc face; 1223, third arc face; 13, base; 14, protective layer; 20, mounting rod;

[0036] 200, driving mechanism;

[0037] 300. Riveted parts. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0040] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0043] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0044] The term “plurality” used in this application refers to two or more (including two).

[0045] At present, using high-strength steel plates instead of ordinary steel plates is an important means of vehicle lightweight design. However, the space for lightweighting the vehicle body by simply using high-strength steel is very limited. With the continuous development of new materials, multi-material structural design has become a trend in vehicle lightweight design. Multi-material structural design provides more options for vehicle lightweighting, but also poses new challenges to vehicle body manufacturing technology, especially connection technology. The use of semi-hollow self-piercing riveting has become the main connection process for multi-material structural body assembly.

[0046] Semi-hollow self-piercing riveting (SPR riveting) overcomes the shortcomings of traditional riveting, such as complex process and poor process appearance, and can complete the punching and riveting in one step. The connection process does not damage the plate coating. SPR riveting uses hydraulic cylinders or servo motors to provide power to directly press rivets into the plates to be riveted. Under the pressure of the rivets, the plates to be riveted undergo plastic deformation with the rivets, and after forming, they fill the riveting mold to form a stable connection.

[0047] The SPR riveting process is divided into four stages: the clamping stage, in which the riveted parts are pressed downward; the sprint stage, in which the driving mechanism moves downward, pushing the rivet to force it to pierce the upper sheet of the riveted parts, and at the same time, the rivet also drives the lower sheet of the riveted parts to undergo plastic deformation into the cavity; the expansion stage, as the riveting process proceeds, the rivet legs gradually open, and the lower sheet undergoes plastic deformation and gradually fills the cavity. Under the joint action of the driving mechanism and the cavity, the rivet legs expand to the surroundings and embed into the lower sheet, thus forming a mechanical interlocking structure between the rivet and the sheet; the punching riveting is completed, and the riveting can be considered completed when the driving mechanism presses the rivet down until the rivet head is in close contact and flush with the upper surface of the upper sheet.

[0048] SPR riveting uses a riveting die for riveting, and the riveting die is usually provided with a cylindrical cavity. Conventional riveting dies are only suitable for riveting of double-layer plates. However, for riveted parts with more than double layers, and riveted parts made of cast aluminum, high-strength steel, profiles and other materials with poor ductility, the pressure on the lower plate during riveting is too large, resulting in cracking of the lower plate, and the risk of reduced corrosion resistance at the riveted joint. The above statements are only used to provide background technical information related to the present application, and do not necessarily constitute prior art.

[0049] In view of the above problems, the present application provides a riveting die, in which the first arc surface connects the end surface and the second arc surface, so as to achieve a smooth transition through the first arc surface at the corner of the end surface and the second arc surface, so as to improve the fluidity of the riveted part in the cavity. The side surface includes three arc surfaces, so that the riveted part has sufficient space to move, and improves the fluidity of the riveted part during the riveting process, reduces the risk of cracking of the riveted part, and improves the success rate of riveting.

[0050] See also Figures 1 to 3 , Figure 1 It is a structural schematic diagram of a riveting die provided in one embodiment of the present application; Figure 2 is a top view of a riveting die provided in one embodiment of the present application; Figure 3 It is a left view of a rivet die provided in one embodiment of the present application.

[0051] like Figures 1 to 3 As shown, the present application proposes a riveting die 100, which includes an end face 11 and a cavity 12 formed by recessing from the end face 11. The cavity 12 includes a bottom face 121 and a side face 122, the side face 122 connects the bottom face 121 and the end face 11, and the side face 122 includes a first arc surface 1221, a second arc surface 1222, and a third arc surface 1223, the first arc surface 1221 connects the end face 11 and the second arc surface 1222, the third arc surface 1223 connects the second arc surface 1222 and the bottom face 121, the radius of the first arc surface 1221 is smaller than the radius of the second arc surface 1222, and the radius of the third arc surface 1223 is smaller than the radius of the second arc surface 1222.

[0052] The riveting die 100 is used to rivet a riveted part. For example, the riveted part includes at least one upper plate and at least one lower plate. The riveting die 100 is used to cooperate with other components of the riveting device to rivet and fix the upper plate and the lower plate of the riveted part.

[0053] The riveting die 100 needs to withstand external pressure, so the riveting die 100 is made of a material with high bearing strength, such as steel, aluminum alloy, or other composite materials.

[0054] Optionally, the material of the riveting die 100 is a carbon fiber composite material, which has the advantages of light weight, high strength, and strong impact resistance.

[0055] In some examples, the rivet die 100 can be in various shapes, such as a cylinder, a cuboid, a trapezoid, etc.

[0056] The riveting die 100 includes an end face 11 and a cavity 12. The end face 11 is an outer surface facing the riveted piece. The cavity 12 is recessed inwardly relative to the end face 11, that is, the cavity 12 is recessed from the end face 11 to form an open cavity 12 at one end.

[0057] For example, during riveting, the riveted part is deformed by force and flows into the cavity 12 at the same time. Under the action of external force, the upper plate and the lower plate of the riveted part are squeezed to form a riveted buckle.

[0058] In some examples, the end surface 11 of the rivet die 100 is a plane.

[0059] Optionally, the cavity 12 is located at the center of the end surface 11 of the riveting die 100 .

[0060] The mold cavity 12 includes a bottom surface 121 and a side surface 122 , wherein the side surface 122 is connected to the bottom surface 121 and the end surface 11 , wherein the bottom surface 121 may be a plane, or the bottom surface 121 may be a curved surface.

[0061] In some examples, the side surface 122 is disposed along a periphery of the bottom surface 121 and connected to an edge of the bottom surface 121 .

[0062] In some examples, the side surface 122 only includes the first arc surface 1221, the second arc surface 1222 and the third arc surface 1223; in other examples, the side surface 122 includes the first arc surface 1221, the second arc surface 1222 and the third arc surface 1223, and may also include a fourth surface, a fifth surface, etc., wherein the fourth surface and the fifth surface may be planes, or the fourth surface and the fifth surface may be arc surfaces.

[0063] In some examples, the first arc surface 1221 is a smooth surface.

[0064] Optionally, the angle corresponding to the first arc surface 1221 is an acute angle.

[0065] In some examples, the second arc surface 1222 is a smooth surface.

[0066] Optionally, the angle corresponding to the second arc surface 1222 is an acute angle.

[0067] In some examples, the third arc surface 1223 is a smooth surface to form a relatively stable transition structure.

[0068] Optionally, the angle corresponding to the third arc surface 1223 is an acute angle.

[0069] In some examples, the second arc surface 1222 smoothly transitions to the end surface 11 through the first arc surface 1221 , and the second arc surface 1222 smoothly transitions to the bottom surface 121 through the third arc surface 1223 .

[0070] In some examples, the third arc surface 1223 may be a convex surface protruding outward, or a concave surface recessed inward. In some examples, the riveting die 100 is used to rivet a riveted piece made of a low elongation material, such as cast aluminum or high-strength steel.

[0071] In the riveting die 100 provided in the present application, the first arc surface 1221 connects the end surface 11 and the second arc surface 1222, so as to realize a smooth transition between the corner of the end surface 11 and the second arc surface 1222 through the first arc surface 1221, so as to improve the fluidity of the riveted part in the cavity 12. The side surface 122 includes three arc surfaces, so that the riveted part has sufficient space to move, and improves the fluidity of the riveted part during the riveting process, reduces the risk of cracking of the riveted part, and improves the success rate of riveting.

[0072] The design of the first arc surface 1221 , the second arc surface 1222 and the third arc surface 1223 allows the riveted component to form a smooth surface. Applying the riveted component to a vehicle helps to make the lines of the vehicle body smoother.

[0073] Combined with reference Figure 4 and Figure 5 , Figure 4 is a front view of a riveting die provided in one embodiment of the present application; Figure 5 for Figure 4 The cross-sectional structure diagram of the rivet die at point aa provided by one embodiment of the present application is shown.

[0074] According to one embodiment of the present application, Figure 4 and Figure 5 As shown, the side surface 122 is not perpendicular to the end surface 11 .

[0075] In some examples, the angle formed between the side surface 122 and the end surface 11 is an obtuse angle.

[0076] In some examples, a line connecting two end points of the first arc surface 1221 is inclined inwardly relative to the end surface 11 .

[0077] In some examples, a line connecting two end points of the second arc surface 1222 is inclined inwardly relative to the end surface 11 .

[0078] Optionally, a line connecting two end points of the first arc surface 1221 is parallel to a line connecting two end points of the second arc surface 1222 .

[0079] In these optional embodiments, the side surface 122 is not perpendicular to the end surface 11 , which can increase the contact area between the side surface 122 and the riveted part, thereby reducing the pressure and improving the fluidity of the riveted part, and also facilitate demolding of the riveted part.

[0080] According to one embodiment of the present application, Figure 2 and Figure 5 As shown, the first arc surface 1221 is a convex surface protruding outward, and the second arc surface 1222 is a concave surface recessed inward.

[0081] The first arc surface 1221 is a convex surface protruding outward, which can be understood as the first arc surface 1221 protruding toward the cavity 12. The second arc surface 1222 is a concave surface concave inward, which can be understood as the second arc surface 1222 concave toward the cavity 12.

[0082] The rivet is squeezed into the cavity 12. In the clamping stage, the rivet is squeezed and contacted with the first arc surface 1221. The rivet undergoes plastic deformation into the cavity 12. The plastic deformation is large, and the slope of the tensile curve formed is also large. In the expansion stage, the rivet is squeezed and contacted with the second arc surface 1222. The rivet undergoes plastic deformation to gradually fill the cavity 12. The plastic deformation is small, and the slope of the tensile curve formed is also small. Therefore, by designing the second arc surface 1222 as a concave surface that is recessed inward, and the radius of the second arc surface 1222 is larger than the radius of the first arc surface 1221, it is beneficial for the overall deformation of the rivet in the expansion stage, and it is also beneficial for forming a mechanical interlocking structure.

[0083] In these optional embodiments, such an arrangement can increase the flow path of the rivet in the cavity 12 to facilitate the deformation of the rivet.

[0084] According to one embodiment of the present application, Figure 5 As shown, the radius of the third arc surface 1223 is greater than the radius of the first arc surface 1221 .

[0085] In some examples, the third arc surface 1223 is a smooth surface.

[0086] Optionally, the radius of the second arc surface 1222 is greater than the sum of the radius of the first arc surface 1221 and the radius of the third arc surface 1223 .

[0087] In these optional embodiments, the third arc surface 1223 connects the second arc surface 1222 and the bottom surface 121 to form a wider and thicker transition area to increase the stress-bearing area and reduce the risk of cracking.

[0088] According to an embodiment of the present application, the third arc surface 1223 is a concave surface that is recessed inward.

[0089] In some examples, a line connecting two endpoints of the third arc surface 1223 intersects an extension line of a line connecting two endpoints of the second arc surface 1222 .

[0090] In these optional embodiments, the flowability of the riveted part from the second arc surface 1222 to the bottom surface 121 in the cavity 12 is facilitated, and demolding of the riveted part is also facilitated.

[0091] Combined with reference Figure 6 , Figure 6 It is a structural schematic diagram of a riveting die provided in another embodiment of the present application.

[0092] According to one embodiment of the present application, Figure 6 As shown, the second arc surface 1222 includes a plurality of sub-arc surfaces 12221 , and one of two adjacent sub-arc surfaces 12221 is a concave surface that is sunken inwards, and the other is a convex surface that is protruding outwards.

[0093] In some examples, the side surface 122 includes a first arc surface 1221, a second arc surface 1222, and a third arc surface 1223. The second arc surface 1222 includes a first sub-arc surface and a second sub-arc surface. The first sub-arc surface is connected to the first arc surface 1221 and the second sub-arc surface, and the second sub-arc surface is connected to the third arc surface 1223. The first arc surface 1221 is a convex surface protruding outward, the first sub-arc surface is a concave surface recessed inward, the second sub-arc surface is a convex surface protruding outward, and the third arc surface 1223 is a concave surface recessed inward.

[0094] In other examples, the side surface 122 includes a first arc surface 1221, a second arc surface 1222, and a third arc surface 1223. The second arc surface 1222 includes a first sub-arc surface, a second sub-arc surface, and a third sub-arc surface. The first sub-arc surface is connected to the first arc surface 1221 and the second sub-arc surface, and the third sub-arc surface is connected to the second sub-arc surface and the third arc surface 1223. The first arc surface 1221 is a convex surface protruding outward, the first sub-arc surface is a concave surface recessed inward, the second sub-arc surface is a convex surface protruding outward, the third sub-arc surface is a concave surface recessed inward, and the third arc surface 1223 is a concave surface recessed inward.

[0095] In some examples, the second arc surface 1222 is configured such that when the number of rivets increases, the number of sub-arc surfaces 12221 included in the second arc surface 1222 increases.

[0096] In these optional embodiments, such an arrangement can effectively increase the flow path of the riveted part.

[0097] According to an embodiment of the present application, the second arc surface 1222 is configured such that the radius of the second arc surface 1222 increases when the number of rivets increases.

[0098] In some examples, the side surface 122 includes a first arc surface 1221, a second arc surface 1222, and a third arc surface 1223. The first arc surface 1221 connects the end surface 11 and the second arc surface 1222, the third arc surface 1223 connects the bottom surface 121 and the second arc surface 1222, the radius of the first arc surface 1221 is smaller than the radius of the second arc surface 1222, and the radius of the third arc surface 1223 is smaller than the radius of the second arc surface 1222. When the number of riveted parts is 3, which are the upper plate, the middle plate, and the lower plate, respectively, the radius of the second arc surface 1222 is m; when the number of riveted parts is 4, which are the upper plate, the two middle plates, and the lower plate, respectively, the radius of the second arc surface 1222 is n, n>m; when the number of riveted parts is 5, which are the upper plate, the three middle plates, and the lower plate, respectively, the radius of the second arc surface 1222 is q, q>n.

[0099] Optionally, the riveting die 100 is configured such that the number of riveted parts is greater than or equal to 2 and less than or equal to 5. The riveted parts are single-layer plates.

[0100] In these optional embodiments, the radius of the second arc surface 1222 is increased, which increases the flow path, facilitates the deformation of the riveted part, and reduces the risk of cracking.

[0101] According to one embodiment of the present application, Figure 1 and Figure 5 As shown, the rivet die 100 includes a rivet die body 10 , which includes a substrate 13 and a protective layer 14 . The protective layer 14 is attached to the surface of the substrate 13 , defines a cavity 12 , and has a hardness greater than that of the substrate 13 .

[0102] Optionally, the base body 13 and the protective layer 14 are detachably connected.

[0103] In some examples, the protection layer 14 includes a first layer body and a second layer body connected, the first layer body is attached to the end surface 11 , the second layer body is attached to the side surface 122 and the bottom surface 121 , and the second layer body defines the mold cavity 12 .

[0104] In some examples, the protection layer 14 includes a plurality of sub-layers, and the plurality of sub-layers are stacked, and the outermost sub-layer defines the cavity 12 .

[0105] In some examples, the material of the protection layer 14 is a cemented carbide material or a ceramic material.

[0106] In some examples, the protective layer 14 is formed by quenching and hardening the surface of the substrate 13 , or the protective layer 14 is formed by chemically plating chrome on the surface of the substrate 13 .

[0107] In these optional embodiments, the protective layer 14 has high hardness and wear resistance, which can reduce wear, extend the service life of the rivet die 100, and reduce the production cost of the rivet die 100.

[0108] According to an embodiment of the present application, the protection layer 14 is an aluminum oxide layer, a boron nitride layer, or a titanium carbide layer.

[0109] In these optional embodiments, these have optional materials so that the protective layer 14 has a higher hardness and also makes the protective layer 14 easy to obtain.

[0110] According to one embodiment of the present application, Figure 1 , Figure 3 and Figure 5 As shown, the riveting die 100 includes a riveting die body 10 and a mounting rod 20 . The mounting rod 20 is disposed on a side of the riveting die body 10 away from the cavity 12 , and the mounting rod 20 is connected to the riveting die body 10 .

[0111] The mounting rod 20 is used to be mounted on the base of the riveting gun.

[0112] In some examples, a mounting portion is provided at one end of the mounting rod 20 away from the rivet die body 10 , and a portion of an outer peripheral surface of the mounting portion is inclined in a direction away from the rivet die body 10 .

[0113] In these optional embodiments, the mounting rod 20 is used to fix the riveting die body 10 , and can tighten the riveting die body 10 during riveting, thereby reducing the risk of the riveting die body 10 falling off.

[0114] Combined with reference Figure 7 , Figure 7 It is a partial structural schematic diagram of a riveting die device provided in one embodiment of the present application.

[0115] Second, as Figure 7 As shown, the present application provides a riveting die device, which includes the riveting die 100 and a driving mechanism 200 according to the above, and the driving mechanism 200 is used to press the riveted part 300 into the cavity 12 for riveting.

[0116] According to some embodiments of the present application, see Figures 1 to 5 As shown, the present application provides a rivet die 100, which includes an end face 11 and a cavity 12 formed inwardly from the end face 11. The cavity 12 includes a bottom face 121 and a side face 122, the side face 122 connects the bottom face 121 and the end face 11, and the side face 122 is inclined inwardly relative to the end face 11. The side face 122 includes a first arc surface 1221, a second arc surface 1222, and a third arc surface 1223, the first arc surface 1221 connects the end face 11 and the second arc surface 1222, the third arc surface 1223 connects the second arc surface 1222 and the bottom face 121, the radius of the first arc surface 1221 is smaller than the radius of the second arc surface 1222, the radius of the third arc surface 1223 is smaller than the radius of the second arc surface 1222, and the radius of the third arc surface 1223 is larger than the radius of the first arc surface 1221. The first arc surface 1221 is a convex surface protruding outward, the second arc surface 1222 is a concave surface recessed inward, and the third arc surface 1223 is a concave surface recessed inward. The rivet die 100 includes a rivet die body 10 and a mounting rod 20. The rivet die body 10 includes a substrate 13 and a protective layer 14, the protective layer 14 is attached to the surface of the substrate 13, and the protective layer 14 defines a cavity 12. The protective layer 14 is a titanium carbide layer. The mounting rod 20 is arranged on a side of the rivet die body 10 away from the cavity 12, and the mounting rod 20 is connected to the rivet die body 10.

[0117] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A riveting die, characterized in that: It includes an end face and a cavity formed by the indentation of the end face; the cavity includes a bottom face and a side face, the side face connects the bottom face and the end face, the side face includes a first arc face, a second arc face and a third arc face, the first arc face connects the end face and the second arc face, the third arc face connects the second arc face and the bottom face, the radius of the first arc face is smaller than the radius of the second arc face, and the radius of the third arc face is smaller than the radius of the second arc face.

2. The riveting die according to claim 1, characterized in that: The side surface is not perpendicular to the end surface.

3. The riveting die according to claim 1, characterized in that: The first arc surface is a convex surface protruding outward, and the second arc surface is a concave surface recessed inward.

4. The riveting die according to claim 1, characterized in that: The radius of the third arc surface is greater than the radius of the first arc surface.

5. The riveting die according to claim 1, characterized in that: The third arc surface is a concave surface that is recessed inwards.

6. The riveting die according to claim 1, characterized in that: The second arc surface includes a plurality of sub-arc surfaces, and one of two adjacent sub-arc surfaces is a concave surface that is sunken inwards, and the other is a convex surface that is protruding outwards.

7. The riveting die according to claim 1, characterized in that: The rivet die comprises a rivet die body, wherein the rivet die body comprises a substrate and a protective layer, wherein the protective layer is attached to the surface of the substrate and defines the cavity.

8. The riveting die according to claim 7, characterized in that: The protective layer is an aluminum oxide layer, a boron nitride layer, or a titanium carbide layer.

9. The riveting die according to claim 1, characterized in that: The rivet die comprises a rivet die body and a mounting rod, wherein the mounting rod is arranged on a side of the rivet die body away from the cavity, and the mounting rod is connected to the rivet die body.

10. A riveting die device, characterized in that: include: The riveting die according to any one of claims 1 to 9; The driving mechanism is used to press the riveted piece into the cavity for riveting.

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