Fastener, riveting assembly and punch

Abstract

The utility model discloses a fastener, a riveting assembly and a punch. The fastener comprises a body, a convex navel and a convex ring. The body is provided with a supporting surface; and the convex navel protrudes out of the supporting surface and is provided with a flanging hole or a flanging groove, so that the convex navel yields and deforms under the pressure action of a punch until the convex navel is bent to buckle the metal plate, the metal plate is clamped by the convex navel and the supporting surface, and the pull-off resistance is improved. The at least two convex rings are arranged in a concentric circle mode, the convex rings surround the convex navel and protrude out of the supporting face, on one hand, the concentric convex rings increase the contact area of the fastener and the metal plate, and therefore the anti-rotation torque is increased; on the other hand, after riveting, the annular convex ring is embedded into the metal plate, so that the metal plate can be prevented from sliding outwards in the radial direction, the metal plate is prevented from being disengaged, a supporting face is changed into multiple circles inside and outside, the contact area of the metal plate and the body is increased, larger axial clamping force can be provided, and it is guaranteed that the metal plate or the body does not yield or deform; and the risk of axial clamping force attenuation is reduced. The fastener is reliable in riveting performance, low in cost and suitable for dissimilar metal connection.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of connecting piece, concretely relates to a fastener, riveting assembly and punch. BACKGROUND

[0002] Fastener is a kind of mechanical parts for fastening connection and is widely applied.In various machinery, equipment, vehicles, ships, railways, construction and other industries, it is widely applied.With the development of automobile industry and the progress of technology, and the improvement of national energy saving and emission reduction requirements, the large application of new material and new technology, the increase of market competition intensity, new requirements are put forward to the simplification of automobile fastener processing technology, the light weight of parts, the diversification of use and the optimization of cost etc..Therefore, riveting nut as a kind of product to replace the original welding connection mode is widely applied and popularized.The existing welding nut is composed of rim, welding leg, screw hole and body, and in the welding process, the actual connection application consumes large energy, pollutes seriously and is difficult to realize the connection with dissimilar metals or non-metals. SUMMARY

[0003] The utility model aims at overcoming the above-mentioned defects or problems in the background art, and provides a fastener, riveting assembly and punch.

[0004] To achieve the above-mentioned purpose, the utility model and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0005] Scheme one, a fastener, comprising

[0006] Body, which is provided with support surface;

[0007] Convex navel, which protrudes from the support surface, is provided with flange hole or flange slot;

[0008] Convex ring, which has at least two and is arranged in concentric circles, surrounds the convex navel outside and protrudes from the support surface.

[0009] Scheme two, based on scheme one, the cross-sectional dimension of the convex ring gradually increases or gradually decreases along the direction close to the support surface.

[0010] Scheme three, based on scheme one, further comprising at least one anti-rotation slot, the anti-rotation slot is opened on the support surface, and the convex ring is divided into several segments.

[0011] Scheme four, based on scheme three, the cross-sectional dimension of the anti-rotation slot gradually increases or gradually decreases along the direction close to the support surface.

[0012] Scheme five, based on scheme three, the anti-rotation slot extends along the radial direction of the convex ring and extends to the side wall of the fastener.

[0013] Sixth aspect, based on the first aspect, further comprising an anti-rotation rib, which protrudes from the support surface and extends along the radial direction of the convex ring and is connected to at least one of the convex rings.

[0014] Seventh aspect, based on the sixth aspect, the anti-rotation rib is connected to adjacent convex rings and / or connected to the convex ring and the convex navel.

[0015] Eighth aspect, a riveting assembly comprising a sheet metal and a fastener as claimed in any one of the first to seventh aspects, the convex navel is adapted to be deformed to jointly hold the sheet metal with the support surface, and the convex ring is adapted to be pierced into the sheet metal.

[0016] Ninth aspect, a punch adapted to form the fastener as claimed in the sixth or seventh aspect, comprising

[0017] a protrusion adapted to form the flange hole or the flange groove;

[0018] a first ring groove surrounding the protrusion and adapted to form the convex navel;

[0019] at least two second ring grooves arranged in concentric circles and surrounding the first ring groove, the second ring grooves are adapted to form the convex rings,

[0020] an anti-rotation groove extending along the radial direction of the second ring groove and communicating with at least one of the second ring grooves, and adapted to form the anti-rotation rib;

[0021] an exhaust hole having one end opening at the bottom of the anti-rotation groove and the other end opening at the side wall of the punch.

[0022] Tenth aspect, based on the ninth aspect, the anti-rotation groove is connected to adjacent second ring grooves and connected to the innermost second ring groove and the first ring groove.

[0023] From the above description of the utility model and its preferred embodiments, compared with the prior art, the technical scheme of the utility model and its preferred embodiments have the following beneficial effects due to the use of the following technical means:

[0024] 1. In the first aspect and its preferred embodiments, a fastener comprises a body, a convex navel and a convex ring.

[0025] The body is provided with a supporting surface; the convex navel protrudes from the supporting surface and is provided with a flange hole or a flange groove, so that under the pressure of a punch, the convex navel yields and deforms until it buckles the sheet metal, so that the convex navel clamps the sheet metal with the supporting surface, improving the anti-pull-out performance. The convex ring has at least two concentric rings, and the convex ring surrounds the convex navel and protrudes from the supporting surface. On one hand, this structure increases the contact area between the fastener and the sheet metal, thereby increasing the anti-rotation torque; on the other hand, after riveting, the annular convex ring is embedded in the sheet metal, which can limit the radial outward sliding of the sheet metal, thereby avoiding the sheet metal from being pulled out, and the supporting surface also becomes a multi-ring structure, thereby increasing the contact area between the sheet metal and the body, which can provide greater axial clamping force, and ensure that the sheet metal or the body does not yield and deform, thereby reducing the risk of axial clamping force decay. The riveting performance of the fastener is reliable, the cost is low, and it is suitable for dissimilar metal connection.

[0026] 2. In the second scheme and its preferred embodiments, the cross-sectional size of the convex ring gradually increases in the direction close to the supporting surface, which is conducive to piercing into the sheet metal and better forming through a mold. When the cross-sectional size of the convex ring gradually decreases in the direction close to the supporting surface, the anti-pull-out performance of the fastener and the sheet metal along the axial direction can be improved.

[0027] 3. In the third scheme and its preferred embodiments, at least one anti-rotation groove is further included, and the anti-rotation groove is open to the supporting surface to improve the anti-rotation performance between the fastener and the sheet metal after riveting. The anti-rotation groove divides the convex ring into several segments to facilitate the formation of the structure.

[0028] 4. In the fourth scheme and its preferred embodiments, the cross-sectional size of the anti-rotation groove gradually increases in the direction close to the supporting surface. During the riveting process, the sheet metal yields and deforms under the extrusion force. The structure of “wide at the top and narrow at the bottom” is conducive to the extrusion of the material into the concave anti-rotation groove. The sheet metal and the side wall of the anti-rotation groove form interlocking in the anti-rotation groove, preventing the fastener from rotating relative to the sheet metal, and better forming through a mold. When the cross-sectional size of the anti-rotation groove gradually decreases in the direction close to the supporting surface, the anti-pull-out performance of the fastener and the sheet metal along the axial direction can be improved.

[0029] 5. In the fifth scheme and its preferred embodiments, the anti-rotation groove extends in the radial direction of the convex ring and extends to the side wall of the fastener to increase the anti-rotation effect.

[0030] 6. In the sixth scheme and its preferred embodiments, an anti-rotation rib is further included, the anti-rotation rib protrudes from the supporting surface and extends in the radial direction of the convex ring and is connected with at least one convex ring. Combined with the cold heading process, a cavity channel for exhausting oil and gas is designed to ensure that the multi-ring convex ring can be smoothly formed. At the same time, after the oil and gas are exhausted, the metal material fills the mold cavity to become an anti-rotation rib higher than the supporting surface (i.e., the anti-rotation rib is formed by the oil groove of the mold), which plays a role in anti-rotation.

[0031] 7. In Scheme 7 and its preferred embodiments, the anti-rotation rib connects adjacent convex rings and / or connects convex rings and convex nipples, thereby improving the anti-rotation effect during cold heading.

[0032] 8. In Scheme 8 and its preferred embodiments, a riveting assembly includes sheet metal and the above-mentioned fasteners, wherein the umbo is adapted to deform to clamp the sheet metal together with the support surface, and the convex ring is adapted to insert into the sheet metal, thus possessing the beneficial effects brought about by the above-mentioned fasteners.

[0033] 9. Solution Nine: A punch suitable for forming the above-mentioned fastener, comprising a protrusion, a first annular groove, a second annular groove, an anti-rotation groove, and a vent hole. The protrusion is suitable for forming a flanged hole or a flanged groove. The first annular groove surrounds the protrusion and is suitable for forming a convex navel. At least two second annular grooves are arranged concentrically, surrounding the first annular groove and suitable for forming a convex ring. The anti-rotation groove extends radially along the second annular groove and communicates with at least one of the second annular grooves. The vent hole has one end open to the bottom of the anti-rotation groove and the other end open to the side wall of the punch. The vent hole allows for venting to ensure that multiple convex rings can be formed smoothly. At the same time, after the oil and gas are vented, the metal material fills the mold cavity, forming an anti-rotation rib higher than the support surface (i.e., using the mold oil groove to form an anti-rotation rib), which plays an anti-rotation role.

[0034] 10. Option 10: The anti-rotation groove connects to the adjacent second ring groove and connects the innermost second ring groove and the first ring groove. Oil and gas at the umbo and each convex ring can be discharged from the anti-rotation groove, making the mold structure simpler. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a perspective view of the fastener in Example 1;

[0037] Figure 2 This is a top view of the fastener in Example 1;

[0038] Figure 3 for Figure 2 A cross-sectional view of section AA in the middle;

[0039] Figure 4 This is a schematic diagram of the fasteners and sheet metal after riveting in Example 1;

[0040] Figure 5 This is a schematic diagram of the structure of the blank in Example 1;

[0041] Figure 6 Structure diagram of the first piece in the embodiment one;

[0042] Figure 7 Structure diagram of the second piece in the embodiment one;

[0043] Figure 8 Structure diagram of the third piece in the embodiment one;

[0044] Figure 9 Structure diagram of the fourth piece in the embodiment one;

[0045] Figure 10 Structure diagram of the fifth piece in the embodiment one;

[0046] Figure 11 Structure diagram of the fastener in the embodiment one;

[0047] Figure 12 Perspective view of the punch in the embodiment one;

[0048] Figure 13 Top view of the punch in the embodiment one;

[0049] Figure 14 Structure diagram of the punch in the embodiment one, the sectional view of the section line shown in Figure 13

[0050] Explanation of main reference signs:

[0051] Body 1; support surface 11; convex belly 2; flange hole 21; convex ring 3; anti-rotation groove 4; anti-rotation rib 5; sheet metal 6; blank 7; first piece 81; first groove 811; second piece 82; second groove 821; third piece 83; first convex part 831; fourth piece 84; rim 841; fifth piece 85; first surface 91; convex 92; first ring groove 93; second ring groove 94; anti-rotation groove 95; exhaust hole 96. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are preferred embodiments of the present application, and should not be regarded as exclusion of other embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0053] In the claims, specification and above drawings of the present application, unless otherwise explicitly limited, the terms such as "first", "second" or "third" are used only to distinguish different objects, and are not used to describe a specific order. ​

[0054] In the claims, the specification, and the drawings of the present application, terms such as "center", "transverse", "longitudinal", "horizontal", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. indicate directions or positions based on the directions and positions shown in the drawings, and are used only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the specific protection scope of the present application.

[0055] In the claims, the specification, and the drawings of the present application, unless otherwise explicitly limited, the term "fixedly connected" or "fixedly connected" should be understood in a broad sense, that is, any connection mode without displacement relationship and relative rotation relationship between the two, that is, it includes non-detachable fixed connection, detachable fixed connection, integration and fixed connection through other devices or elements.

[0056] In the claims, the specification, and the drawings of the present application, the terms "include", "have" and their variants are intended to mean "contain but not limited to".

[0057] Reference Figures 1-3 A fastener comprising a body 1, a convex belly 2, a convex ring 3, an anti-rotation groove 4, and an anti-rotation rib 5.

[0058] The body 1 is provided with a supporting surface 11. In this embodiment, the body 1 can be circular, or can adopt a quadrangular structure, a hexagonal structure, an octagonal structure, etc. In this embodiment, the body 1 is circular, and the specification is M8, and the diameter is 16-24mm.

[0059] The convex belly 2 protrudes from the supporting surface 11. In this embodiment, the convex belly 2 is coaxially arranged with the body 1, and the convex belly 2 is annular, the diameter of the convex belly 2 is 11-13mm, and the height is 2mm-5mm. The main function of the convex belly 2 is to buckle the metal sheet 6 during riveting, and to generate a resistance force (i.e. a pull-out force) against pull-out. In this embodiment, the convex belly 2 is provided with a flanging hole 21, the flanging hole 21 penetrates through the fastener, and the flanging hole 21 is deformed by extending into the flanging hole 21 through a mold, so that the convex belly 2 is flanged. In this embodiment, the flanging hole 21 penetrates through the convex belly 2 and is a threaded hole, and the flanging hole 21 is coaxially arranged with the body 1, and can be eccentrically arranged under special application conditions, for example, when the threaded hole is used as a positioning functional part, and the outer wall of the body 1 has a positioning or limiting function, the threaded hole can be eccentrically arranged with the body 1. In other embodiments, the convex belly 2 can be provided with a flanging groove (not penetrating), so that the convex belly 2 is flanged.

[0060] The convex ring 3 has at least two and is arranged in concentric circles, the convex ring 3 surrounds the convex navel 2 and protrudes from the support surface 11, so as to divide the support surface 11 into a plurality of coaxially arranged support planes, which are completely attached to the surface of the sheet metal 6 after riveting, the design of the inner and outer multiple circles increases the contact area of the sheet metal 6 and the body 1, which can provide greater axial clamping force, and ensure that the sheet metal 6 or the body 1 does not yield and deform, and reduce the risk of axial clamping force decay; the height of the convex ring 3 is 0.3-0.5mm, the cross-sectional size of the convex ring 3 gradually increases or gradually decreases along the direction close to the support surface 11, preferably, the cross-sectional size of the convex ring 3 gradually increases along the direction close to the support surface 11, which is a structure of "narrow at the top and wide at the bottom", which is beneficial to piercing into the sheet metal 6 during the riveting process; on the one hand, this structure increases the contact area of the fastener and the sheet metal 6, thereby increasing the anti-rotation torque; on the other hand, after riveting, the convex ring 3 is embedded in the sheet metal 6, which can limit the radial outward sliding of the sheet metal 6, thereby avoiding the sheet metal 6 from being pulled out, increasing the pull-out force after riveting, and improving the connection strength. On the contrary, the anti-rotation performance in the axial direction can be increased. In the embodiment, the convex ring 3 has two.

[0061] The number of anti-rotation grooves 4 is at least one, in the embodiment, the anti-rotation grooves 4 are eight, two by two, and each group is uniformly arranged. The anti-rotation grooves 4 are opened on the support surface 11, the bottom surface of the anti-rotation grooves 4 is lower than the support surface 11, and the convex ring 3 is divided into several segments, the anti-rotation grooves 4 extend along the radial direction of the convex ring 3, penetrate through the two convex rings 3 and extend to the side wall of the fastener, and the depth of the anti-rotation grooves 4 is 0.1-0.4mm. The cross-sectional size of the anti-rotation grooves 4 gradually increases or gradually decreases along the direction close to the support surface 11. In the embodiment, the cross-sectional size of the anti-rotation grooves 4 gradually increases along the direction close to the support surface 11, and preferably, the cross-section of the anti-rotation grooves 4 in the axial direction is a structure of "wide at the top and narrow at the bottom"; during the riveting process, the sheet metal 6 is deformed under the extrusion force, and the structure of "wide at the top and narrow at the bottom" is beneficial to the material being extruded into the anti-rotation grooves 4, and the sheet metal 6 and the side wall of the anti-rotation grooves 4 form interlocking in the anti-rotation grooves 4, thereby preventing the nut from rotating relative to the sheet metal 6. On the contrary, the anti-rotation performance in the axial direction can be increased.

[0062] The number of anti-rotation ribs 5 is four and is uniformly arranged, specifically, between the two adjacent groups of anti-rotation grooves 4. The anti-rotation ribs 5 protrude from the support surface 11 and extend along the radial direction of the convex ring 3 and are connected with the convex ring 3, preferably, the anti-rotation ribs 5 connect the adjacent convex rings 3, and connect the innermost convex ring 3 and the convex navel 2. During the riveting process, the anti-rotation ribs 5 pierce into the sheet metal 6, which plays a role in anti-rotation; on the other hand, during the cold heading forming process, before the metal material fills the cavity, the cavity channel plays a role in oil and gas discharge, so as to ensure that the convex ring 3 can be smoothly formed. Among them, the anti-rotation rib 5 extending along the radial direction of the convex ring 3 includes that the extension direction of the anti-rotation rib 5 is parallel to a radial direction of the convex ring 3, or has a certain angle, as long as the anti-rotation effect can be achieved.

[0063] The fastener can be a nut or a bolt. In this embodiment, the nut is taken as an example.

[0064] The processing method of the fastener comprises the following steps:

[0065] Reference Figures 5-11 The blank is shaped by a cold heading die to form a first groove 811 on the blank 7 and obtain a first piece 81; the blank is cylindrical,

[0066] The first piece 81 is inserted into a hole by a cold heading die to deepen the groove depth of the first groove 811 of the first piece 81 and form a second groove 821 on the other side, and obtain a second piece 82;

[0067] The middle part of the second piece 82 is radially protruded by a cold heading die to form a first protruding part 831 and obtain a third piece 83, which is generally in the shape of a Chinese character "zhong".

[0068] The first protruding part 831 of the third piece 83 is shaped by a cold heading die to obtain a flange 841 and the first groove 811 is shaped to form a convex belly 2, and obtain a fourth piece 84, wherein the convex belly 2 protrudes from the flange 841.

[0069] The flange 841 of the fourth piece 84 is shaped by a cold heading die to form a body 1 and a convex ring 3 to form a riveting feature, and the first groove 811 is further deepened to obtain a fifth piece 85; with reference to Figures 12-14 Specifically, the cold heading die comprises a punch, which comprises a first face 91, a protrusion 92, a first ring groove 93, a second ring groove 94, an anti-rotation groove 95 and an exhaust hole 96. The protrusion 92 is adapted to form a flanging hole or a flanging groove, and in this example, the protrusion 92 is used to deepen the first groove 811; the first ring groove 93 is arranged around the outside of the protrusion 92 and is adapted to form the convex belly 2; the second ring groove 94 is arranged in at least two concentric circles, and the second ring groove 94 is arranged around the outside of the first ring groove 93 and is adapted to form the convex ring 3; the anti-rotation groove 95 extends in the radial direction of the second ring groove 94, and the anti-rotation groove communicates with at least one second ring groove 94; preferably, in this embodiment, the anti-rotation groove 95 connects adjacent second ring grooves 94, and connects the innermost second ring groove 94 and the first ring groove 93; the oil and gas at the convex belly 2 and each convex ring 3 can be discharged from the anti-rotation groove 95, and the structure of the die is simpler. The exhaust hole 96 is open at one end to the groove bottom of the anti-rotation groove 95, and is open at the other end to the side wall of the punch to realize the function of discharging oil and gas. In this embodiment, the top of the protrusion 92 is flush with the first face 91, and the first ring groove 93, the second ring groove 94 and the anti-rotation groove 95 are all open to the first face 91.

[0070] The first slot 811 and the second slot 821 of the fifth piece 85 are made through by a cold heading die, so that the first slot 811 and the second slot 821 are communicated to form the flanging hole 21. The forming mode is simple, so that the corresponding die is also relatively simple; and in the process of making the first slot 811 and the second slot 821 through to form the body 1 and the convex ring 3, the gradual forming by multiple cold heading reduces the stress concentration caused by one-time forming and the phenomenon of easy breaking.

[0071] Compared with the prior art, the embodiment has the following beneficial effects:

[0072] In an exemplary embodiment, a fastener includes a body 1, a convex belly 2 and a convex ring 3.

[0073] The body 1 is provided with a support surface 11; the convex belly 2 protrudes from the support surface 11 and is provided with a flanging hole 21 or a flanging slot, so that under the action of a punch pressure, the convex belly 2 yields and deforms until it buckles to hold the sheet metal 6, so that the convex belly 2 clamps the sheet metal 6 with the support surface 11, thereby improving the anti-pull-out performance. The convex ring 3 has at least two concentric rings, and the convex ring 3 surrounds the convex belly 2 and protrudes from the support surface 11. On one hand, this structure increases the contact area of the fastener and the sheet metal 6, thereby increasing the anti-rotation torque; on the other hand, after riveting, the annular convex ring 3 is embedded in the sheet metal 6, which can limit the radial outward sliding of the sheet metal 6, thereby avoiding the sheet metal 6 from being pulled out. Compared with the design of a U-shaped and inwardly inclined annular groove to achieve the above effect, in the scheme of the annular groove, the sheet metal 6 is easy to be pulled out of the annular groove, the pull-out force is small after riveting, and the connection strength is low. The way of the convex ring 3 has better riveting effect. And the support surface 11 also becomes a multi-ring, compared with the prior art which only has the outermost ring of the support surface 11, this scheme increases the contact area of the sheet metal 6 and the body 1, which can provide greater axial clamping force, while ensuring that the sheet metal 6 or the body 1 does not yield and deform, reducing the risk of axial clamping force decay. The riveting performance of the fastener is reliable, the cost is low, and it is suitable for dissimilar metal connection.

[0074] In an exemplary embodiment, the cross-sectional size of the convex ring 3 gradually increases in the direction close to the support surface 11, which is beneficial to penetrating into the sheet metal 6 and better forming by a die. When the cross-sectional size of the convex ring 3 gradually decreases in the direction close to the support surface 11, the anti-pull-out performance of the fastener and the sheet metal 6 along the axial direction can be improved.

[0075] In an exemplary embodiment, at least one anti-rotation slot 4 is further included, and the anti-rotation slot 4 is opened on the support surface 11 to improve the anti-rotation performance between the fastener and the sheet metal 6 after riveting. The anti-rotation slot 4 divides the convex ring 3 into several segments to facilitate the forming of the structure.

[0076] In an exemplary embodiment, the cross-sectional dimension of the anti-rotation groove 4 gradually increases in the direction close to the support surface 11. During the riveting process, the sheet metal 6 is deformed by the extrusion force. The structure of "wide at the top and narrow at the bottom" is conducive to the material being extruded into the concave anti-rotation groove 4. The sheet metal 6 and the side wall of the anti-rotation groove 4 form interlocking in the anti-rotation groove 4, preventing the fastener from rotating relative to the sheet metal 6, and better forming through the mold. When the cross-sectional dimension of the anti-rotation groove 4 gradually decreases in the direction close to the support surface 11, the anti-pull-out performance of the fastener and the sheet metal 6 in the axial direction can be improved.

[0077] In an exemplary embodiment, the anti-rotation groove 4 extends in the radial direction of the convex ring 3 and extends to the side wall of the fastener to increase the anti-rotation effect.

[0078] In an exemplary embodiment, the anti-rotation rib 5 protrudes from the support surface 11 and extends in the radial direction of the convex ring 3 and is connected with the convex ring 3. In combination with the cold heading process, a cavity hole for exhausting oil and gas is designed to ensure that the multiple turns of the convex ring 3 can be smoothly formed. At the same time, after the oil and gas are exhausted, the metal material fills the mold cavity to become an anti-rotation rib higher than the support surface 11 (i.e., the anti-rotation rib is formed by the oil groove of the mold), which plays a role in anti-rotation. Compared with the way of setting the convex teeth in the annular groove to achieve the anti-rotation effect, the forming process is simpler and the mold life is higher.

[0079] In an exemplary embodiment, the anti-rotation rib 5 connects adjacent convex rings 3 and / or connects the convex ring 3 and the convex navel 2, which improves the anti-rotation effect during the cold heading forming process.

[0080] In an exemplary embodiment, a punch suitable for forming the above fastener includes a protrusion 92, a first ring groove 93, a second ring groove 94, an anti-rotation groove 95, and an exhaust hole 96. The protrusion 92 is suitable for forming the flanging hole 21 or the flanging groove. The first ring groove 93 surrounds the outside of the protrusion 92 and is suitable for forming the convex navel 2. The second ring groove 94 is arranged in at least two concentric circles, surrounds the outside of the first ring groove 93, and is suitable for forming the convex ring 3. The anti-rotation groove 95 extends in the radial direction of the second ring groove 94 and communicates with at least one second ring groove 94, and is suitable for forming the anti-rotation rib 5. The exhaust hole 96 has one end opening at the bottom of the anti-rotation groove 95 and the other end opening at the side wall of the punch. Exhausting through the exhaust hole 96 ensures that the multiple turns of the convex ring 3 can be smoothly formed. At the same time, after the oil and gas are exhausted, the metal material fills the mold cavity to become an anti-rotation rib 5 higher than the support surface 11 (i.e., the anti-rotation rib 5 is formed by the oil groove of the mold), which plays a role in anti-rotation. Compared with the way of setting the convex teeth in the annular groove to achieve the anti-rotation effect, the forming process is simpler and the mold life is higher.

[0081] Embodiment Two

[0082] Reference Figure 4, riveting assembly includes sheet metal 6 and the above fastener, convex navel 2 is suitable for deformation to hold sheet metal 6 with support surface 11, convex ring 3, anti-rotation rib 5 is suitable for piercing sheet metal 6, and sheet metal 6 is suitable for filling anti-rotation groove 4.

[0083] Before riveting, the hole on sheet metal 6 is sleeved on convex navel 2, and during riveting, the punch is inserted into the flanging hole 21 or the flanging groove, and the convex navel 2 is deformed under the pressure of the punch until it is buckled to hold sheet metal 6, and continues to apply pressure, the punch and the deformed convex navel 2 extrude sheet metal 6 to deform, the convex ring 3 and the anti-rotation rib 5 pierce into sheet metal 6, and at the same time, the sheet metal 6 material is also extruded into the anti-rotation groove 4. Finally, the flanging of convex navel 2 is completed, and sheet metal 6 is buckled, and the flanging of convex navel 2 can ensure that the nut does not peel off from sheet metal 6 under a certain axial load; at the same time, the convex ring 3 is embedded in sheet metal 6, which can limit the radial outward sliding of sheet metal 6, thereby avoiding the disengagement of sheet metal 6, increasing the pull-out force after riveting, and improving the connection strength. The plane of sheet metal 6 is completely attached to support surface 11, and the interlocking structure formed by anti-rotation groove 4, sidewall of anti-rotation groove 4 and anti-rotation rib 5 and sheet metal 6 can ensure that the nut does not rotate relative to sheet metal 6 under a larger torque. This design is also applicable to the press-in bolt.

[0084] The above description and embodiment are used to explain the protection scope of the present application, but do not constitute a limitation on the protection scope of the present application. Through the inspiration of the present application or the above embodiment, the modification, equivalent replacement or other improvement of the present application embodiment or part of the technical features can be obtained by the ordinary skill in the art combined with common knowledge, ordinary technical knowledge in the art and / or existing technology through logical analysis, reasoning or limited test, which should be included in the protection scope of the present application.

Claims

1. A fastener, characterized by: The body (1) is provided with a supporting surface (11); The convex navel (2) projects from the supporting surface (11) and is provided with a flange hole (21) or a flange groove; The convex ring (3) has at least two and is arranged in concentric circles, and the convex ring (3) surrounds the convex navel (2) and projects from the supporting surface (11). The cross-sectional size of the convex ring (3) gradually increases or gradually decreases in the direction close to the supporting surface (11).

2. A fastener as claimed in claim 1 wherein: Further comprising at least one anti-rotation groove (4) which is opened on the supporting surface (11) and divides the convex ring (3) into several segments.

3. A fastener as defined in claim 1, wherein: The cross-sectional size of the anti-rotation groove (4) gradually increases or gradually decreases in the direction close to the supporting surface (11).

4. A fastener as claimed in claim 3 wherein: The anti-rotation groove (4) extends in the radial direction of the convex ring (3) and extends to the side wall of the fastener.

5. A fastener as defined in claim 3 wherein: Further comprising an anti-rotation rib (5) which projects from the supporting surface (11) and extends in the radial direction of the convex ring (3) and is connected with at least one of the convex ring (3).

6. A fastener as claimed in any one of claims 1 to 5 wherein: The anti-rotation rib (5) connects adjacent convex rings (3) and / or connects the convex ring (3) and the convex navel (2).

7. A fastener as claimed in claim 6 wherein: The sheet metal (6) and the fastener according to any one of claims 1-7 are included, the convex navel (2) is adapted to be deformed to jointly clamp the sheet metal (6) with the supporting surface (11), and the convex ring (3) is adapted to pierce into the sheet metal (6).

8. A riveted assembly characterized by: It is adapted to form the fastener according to claim 6 or 7, which comprises 9. A punch characterized in that: The convex (92) is adapted to form the flange hole (21) or the flange groove; The first ring groove (93) surrounds the convex (92) and is adapted to form the convex navel (2); The second ring groove (94) has at least two and is arranged in concentric circles, and the second ring groove (94) surrounds the first ring groove (93) and is adapted to form the convex ring (3), The anti-rotation groove (95) extends in the radial direction of the second ring groove (94) and communicates with at least one of the second ring groove (94), and is adapted to form the anti-rotation rib (5); The exhaust hole (96) is opened at one end of the bottom of the anti-rotation groove (95) and at the other end of the side wall of the punch. The anti-rotation groove (95) connects adjacent second ring grooves (94) and connects the innermost second ring groove (94) and the first ring groove (93).

10. A punch as claimed in claim 9, characterized in that: The anti-rotation groove (95) connects adjacent second ring grooves (94) and connects the innermost second ring groove (94) and the first ring groove (93).

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