Rivet convenient to install and riveting method

Abstract

The invention provides a rivet convenient to install and a riveting method, the rivet comprises a rivet body, the rivet body comprises a rivet head, a ring groove locking part, a broken neck part and a broken tail part which are connected in sequence, and the broken tail part is provided with a locking structure; the inner diameter of the lantern ring is larger than the outer diameter of the ring groove locking part, and the lantern ring is installed on the outer side of the ring groove locking part; and the inner diameter of the shaping ring is smaller than the outer diameter of the lantern ring. The rivet has the beneficial effects that the strength of the shaping ring is larger than that of the lantern ring, the shaping ring cannot be separated from the lantern ring after riveting is finished, and rivet looseness caused by deformation of the lantern ring in the use process of the rivet can be prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of riveting, and in particular relates to a rivet that is easy to install and a riveting method. Background Art

[0002] Ring groove rivets are a new type of riveting structure widely used in the automotive industry, construction field, heavy machinery, aerospace and other scenarios. The rivet consists of two parts, namely the high-strength nail body and the ring. When connecting, both sides of the connected parts are open environments. The high-strength core rod is inserted into the prefabricated hole from one side of the workpiece, and the ring is put on the high-strength core rod from the other side. Under the action of axial tensile force and radial extrusion force, the ring is plastically extruded into the annular groove of the core rod to form a permanent and non-detachable connection.

[0003] Since the riveting of ring groove rivets requires a large tensile load, except for ring groove rivets with a nominal diameter of 6mm, rivets of other specifications need to be assembled through a hydraulic station and a rivet gun.

[0004] The following problems exist in the use of traditional ring groove rivets: First, the installation equipment cost is high. Due to its structural limitations, ring groove rivets are installed with hydraulic rivet guns. The price of a hydraulic station and rivet gun on the market is about 150,000 yuan. If installation points need to be set up on multiple production lines or multiple workstations, the cost will increase exponentially, which is unaffordable for general civilian industrial products. Second, the scope of application is narrow. In some work scenarios, there are high requirements for the portability of installation tools. For example, in the installation of tower structures, photovoltaic bracket structures, railway hanging strings and other scenes that require aerial assembly or on-site assembly, it is obviously impossible to lift the bulky hydraulic station into the air or carry it with you, resulting in the limitation of the scope of application of rivets. Third, the riveting speed is slow and the riveting quality is insufficient. The higher the strain rate of the plastic deformation of the material during the riveting process, the more uniform the plastic deformation of the riveting area, and the less thermal deformation and performance degradation of the material, the better the performance of the riveting point. Traditional ring groove rivets are installed by hydraulic pull rivets. The riveting time usually takes 0.5s-1s, and the material strain rate is low, so there is a lot of room for improvement in riveting quality. Summary of the invention

[0005] In view of this, the present invention aims to provide a rivet and a riveting method that are easy to install, in order to solve at least one of the above-mentioned technical problems.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows: A first aspect of the present invention provides a rivet that is easy to install, characterized in that it includes: A nail body, the nail body comprising a rivet head, a ring groove locking portion, a broken neck portion, and a broken tail portion connected in sequence, wherein the broken tail portion is provided with a locking structure; A collar, the inner diameter of which is larger than the outer diameter of the annular groove locking portion, and the collar is installed on the outer side of the annular groove locking portion; A shaping ring, wherein the inner diameter of the shaping ring is smaller than the outer diameter of the sleeve ring.

[0007] Furthermore, the locking structure of the broken tail portion is a threaded structure; The rivet that is easy to install also includes: A driving member is threadedly connected to the tail portion, and the shaping ring is located between the collar and the driving member.

[0008] Furthermore, a lubricating layer is provided on the surface of the broken tail portion.

[0009] Furthermore, a third annular boss corresponding to the shaping ring is fixedly provided on the end surface of the driving member adjacent to the shaping ring; The upper surface of the end surface of the third annular boss adjacent to the shaping ring is provided with a lubricating layer.

[0010] Furthermore, the driving member is a polygonal column structure, and is provided with a threaded hole matching the broken tail portion.

[0011] Furthermore, the outer edge of the upper end of the collar adopts a chamfered structure; The inner edge of the lower end of the shaping ring adopts a chamfered structure; The hardness and strength of the shaping ring are respectively greater than the hardness and strength of the collar, and the hardness and strength of the ring groove locking portion are respectively greater than the hardness and strength of the collar.

[0012] Furthermore, a first annular boss is fixedly provided on the outer side of the lower end of the collar, and an anti-slip structure is provided on the end surface of the first annular boss adjacent to the rivet head.

[0013] Furthermore, a second annular boss is fixedly provided on the outer side of one end of the rivet head adjacent to the annular groove locking portion, and an anti-slip structure is provided on the end surface of the second annular boss adjacent to the annular groove locking portion.

[0014] Furthermore, the rivet head is connected to the annular groove locking portion through a rivet rod.

[0015] A second aspect of the present invention provides a riveting method, comprising the following steps: S1. Insert the nail body through the rivet hole; S2. Install the collar on the outer side of the ring groove locking part, and install the shaping ring on the outer side of the tail end; S3, the driving member is threadedly connected to the tail end; S4, rotate the driving part in the tightening direction, and the shaping ring moves downward to deform the collar and lock the locking part of the ring groove until the neck is broken; The rivet is the rivet described in the first aspect.

[0016] Compared with the prior art, the rivet and riveting method that are easy to install described in the present invention have the following beneficial effects: (1) The rivet described in the present invention is easy to install, the strength of the shaping ring is greater than the strength of the sleeve ring, and the shaping ring will not fall off the sleeve ring after riveting is completed, which can prevent the rivet from loosening due to deformation of the sleeve ring during use.

[0017] (2) The rivet described in the present invention is easy to install. It uses a driving member to connect with the threaded part of the broken tail. The driving member can be rotated to drive the shaping ring to move downward. There is no relative rotation between the shaping ring and the sleeve ring, which reduces the friction. The operation process is convenient and only needs to use a wrench to complete the riveting. Compared with traditional hydraulic riveting, the installation cost is reduced.

[0018] (3) The riveting method described in the present invention is convenient to operate and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of a three-dimensional structure of an exploded rivet according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the rivet in use according to an embodiment of the present invention; Figure 3 This is a schematic cross-sectional structure diagram of a rivet in use according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of a nail body according to an embodiment of the present invention; Figure 5 It is a schematic cross-sectional structure diagram of the rivet riveting process according to an embodiment of the present invention; Figure 6 The figure is a schematic flow chart of the riveting method according to an embodiment of the present invention.

[0020] Description of reference numerals: 1. Nail body; 2. Ring; 3. Shaping ring; 4. Driving member; 5. Part to be connected; 101. Rivet head; 102. Nail rod; 103. Ring groove locking part; 104. Broken neck; 105. Broken tail; 106. Second annular boss; 201. First annular boss; 401. Third annular boss. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "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 accompanying 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 limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 by specific circumstances.

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0025] like Figures 1 to 4 As shown, a rivet that is easy to install is characterized by comprising: a rivet body 1, which includes a rivet head 101, a ring groove locking portion 103, a broken neck portion 104, and a broken tail portion 105 connected in sequence, and a locking structure is provided on the broken tail portion 105; a collar 2, the inner diameter of the collar 2 is larger than the outer diameter of the ring groove locking portion 103, and the collar 2 is installed on the outer side of the ring groove locking portion 103; a shaping ring 3, the inner diameter of the shaping ring 3 is smaller than the outer diameter of the collar 2. The inner diameter of the shaping ring 3 is larger than the inner diameter of the collar 2, and the outer diameter of the shaping ring 3 is larger than the outer diameter of the collar 2.

[0026] In some embodiments, the locking structure is a plurality of annular grooves, and the plurality of annular grooves are located on the outer wall of the tail portion 105 . The riveting tool pushes the shaping ring downward after passing through the locking annular grooves, so that the ring 2 is deformed and locks the annular groove locking portion 103 .

[0027] In other embodiments, the locking structure of the broken tail portion 105 is a threaded structure; the threaded structure of the broken tail portion 105 can be an external thread on its side wall, or a threaded groove coaxially arranged with the short tail portion.

[0028] Other rivets that facilitate installation include: The driving member 4 is threadedly connected to the tail portion 105 , and the shaping ring 3 is located between the collar 2 and the driving member 4 .

[0029] When the thread structure of the tail section 105 is an external thread, the driving member 4 is provided with a threaded hole matching the external thread; the driving member 4 is a multi-prism structure, and the driving member 4 is provided with a threaded hole matching the tail section 105. In the present application, the driving member 4 is a multi-hexagonal prism structure, which is convenient for rotation using a wrench.

[0030] When the thread structure of the tail portion 105 is a thread groove, the driving member 4 is provided with a thread column matching the thread groove.

[0031] A lubricating layer is provided on the surface of the broken tail portion 105, and the lubricating layer reduces the friction force during the relative rotation between the driving member 4 and the short tail portion.

[0032] A third annular boss 401 corresponding to the shaping ring 3 is fixedly provided on the end face of the driving member 4 adjacent to the shaping ring 3; a lubricating layer is provided on the upper surface of the end face of the third annular boss 401 adjacent to the shaping ring 3. The setting of the lubricating layer reduces the friction between the third annular boss 401 and the shaping ring 3. The inner and outer edges of the shaping ring 3 adjacent to one end of the driving member 4 are both chamfered to reduce the contact surface with the third annular boss 401, thereby reducing the friction.

[0033] The lubricating layer may be but is not limited to the existing MoS2 coating.

[0034] The outer edge of the upper end of the ring 2 adopts a chamfered structure; the inner edge of the lower end of the shaping ring 3 adopts a chamfered structure; the chamfered structure of the ring 2 and the chamfered structure of the shaping ring 3 play a guiding role in the process of the shaping ring 3 moving downward, which facilitates the ring 2 to enter the inner side of the shaping ring 3, the hardness and strength of the shaping ring 3 are respectively greater than the hardness and strength of the ring 2, and the hardness and strength of the ring groove locking part 103 are respectively greater than the hardness and strength of the ring 2.

[0035] A first annular boss 201 is fixedly provided on the outer side of the lower end of the collar 2, and an anti-slip structure is provided on the end surface of the first annular boss 201 adjacent to the rivet head 101. The first annular boss 201 increases the contact area between the collar 2 and the workpiece to be riveted, increases the friction force, and the anti-slip structure of the collar 2 further increases the friction force. The height of the shaping ring 3 is greater than the height of the collar 2 minus the height of the first annular boss 201.

[0036] A second annular boss 106 is fixedly disposed on the outer side of one end of the rivet head 101 adjacent to the annular groove locking portion 103, and an anti-skid structure is disposed on the end surface of the second annular boss 106 adjacent to the annular groove locking portion 103. The second annular boss 106 increases the contact area between the rivet head 101 and the workpiece to be riveted, thereby increasing the friction force, and the anti-skid structure of the second annular boss 106 further increases the friction force, and the anti-skid structure can be an anti-skid pattern or an anti-skid rubber pad.

[0037] The rivet head 101 is connected to the annular groove locking portion 103 via the rivet rod 102 .

[0038] The diameter size of the second annular boss of the present invention needs to be designed according to a formula, and the head size specified in the national standard ring groove rivet cannot be directly adopted. The equivalent friction diameter of the rivet head 101 is calculated by the thread middle diameter of the broken tail 105, which can effectively prevent the rivet from rotating.

[0039] When the bolt connection structure is installed by the tightening method, if there is no restriction on the bolt head, the bolt may rotate when tightening the nut, resulting in the inability to complete the assembly. Therefore, an additional wrench is usually required to impose restrictions on the bolt head. The head of the ring groove rivet is a rotationally symmetrical figure, and the rotation direction of the rivet head cannot be restricted during the assembly process. Since the assembly process of ordinary ring groove rivets is a pure tensile assembly, there is no need to consider the problem of rivet rotation. Since the high-efficiency ring groove rivets of this application modify the assembly method to tightening assembly, if the rivet rotation problem occurs, the assembly cannot be completed.

[0040] Friction torque at the rivet head for: ; Friction torque at the thread taking into account the thread lead angle for: ; The basic conditions for the rivet to not rotate are: ; The minimum diameter of the rivet head bearing surface is calculated based on the thread pitch diameter, and the formula is as follows: ; in, is the equivalent friction diameter of the second annular boss of the rivet head, is the thread diameter of the broken tail, is the thread profile angle, is the pitch of the tail, is the thread friction coefficient, is the friction coefficient between the second annular boss support surface and the part to be connected, The anti-slip safety factor ranges from 1 to 2.

[0041] The equivalent friction diameter of the second annular boss can be simply regarded as the diameter of the contact area between the rivet head and the workpiece to be connected.

[0042] The material of the rivet remains unchanged, and the equivalent uniaxial stress of the high-efficiency ring groove rivet that breaks under tension and torsion load should be equal to the tensile fracture stress of the national standard metric thread: ; In order to ensure the same riveting quality, the riveting loads of the two must be the same, that is, , combined to get: ; The broken neck ring groove area of ​​the high-efficiency ring groove rivet is: ; For the same cross-sectional area, the tensile stress Torsional shear stress The relationship satisfies the formula: ; The calculation formula of the cross-sectional area of ​​the broken neck is as follows: ; in, is the cross-sectional area of ​​the broken neck, is the adjustment factor, is the cross-sectional area of ​​the broken neck of the national standard ring groove rivet, The thread diameter at the end of the thread. is the thread profile angle, is the thread friction coefficient, It is the pitch of the thread end.

[0043] By increasing the diameter of the broken neck, the preload force of the high-efficiency ring groove rivet that breaks under tension and torsion load is consistent with that of the national standard product.

[0044] The thread structure of the tail section 105 is a multi-thread thread; the number of threads of the multi-thread thread is determined according to the nominal diameter of the rivet.

[0045] When the number of threads is higher than three, the processing is more difficult, so threads higher than three are not considered. The thread structure of the thread tail adopts a multi-thread design, which can increase the riveting speed.

[0046] Since the multi-threaded tail will increase the rivet assembly torque, for larger rivets, if the required assembly torque is close to the limit of the portable tightening tool, the multi-thread design should not be used. According to calculations, the recommended screw tail threads for different specifications of I-type ring groove rivets are as follows: Table 1 Recommended screw tail threads for high-efficiency ring groove rivets of different specifications Rivet nominal diameter (mm) Number of threads at screw tail 6~10 3 12~14 2 ≥16 1 like Figure 5 to Figure 6 As shown, a riveting method comprises the following steps: S1, inserting the nail body 1 through the riveting hole of the part to be riveted; S2, install the collar 2 on the outer side of the ring groove locking portion 103, and install the shaping ring 3 on the outer side of the tail portion 105; S3, the driving member 4 is threadedly connected with the tail portion 105 (as shown in the left figure in 5); S4, rotate the driving member 4 in the tightening direction, and the shaping ring 3 moves downward to deform the ring 2 and lock the ring groove locking part 103 (as shown in the middle figure in 5, the ring 2 deforms inwardly and fills the annular groove of the ring groove locking part 103), until the broken neck part 104 breaks (as shown in the right figure in 5), and the broken tail part 105 and the driving member 4 can be separated and recycled to utilize the driving member 4, and the broken tail part 105 can be directly discarded, or the broken tail part 105 and the driving member 4 can be directly discarded together.

[0047] Beneficial effects:

[0048] The application uses a threaded connection between the driving member 4 and the tail portion 105. The driving member 4 is rotated to drive the shaping ring 3 to move downward. There is no relative rotation between the shaping ring 3 and the ring 2, which reduces the friction. The strength of the shaping ring 3 is greater than that of the ring 2. After riveting, the shaping ring 3 will not separate from the ring 2, which can prevent the rivet from loosening due to deformation of the ring 2 during use. The operation process is convenient and only a wrench is needed to complete the riveting. Compared with traditional hydraulic riveting, the work efficiency is improved.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rivet that is easy to install, characterized in that: include: A nail body (1), the nail body (1) comprising a rivet head (101), a ring groove locking portion (103), a broken neck portion (104), and a broken tail portion (105) connected in sequence, the broken tail portion (105) being provided with a locking structure, and the locking structure of the broken tail portion (105) being a threaded structure; A collar (2), wherein the inner diameter of the collar (2) is larger than the outer diameter of the annular groove locking portion (103), and the collar (2) is mounted on the outer diameter of the annular groove locking portion (103); A shaping ring (3), wherein the inner diameter of the shaping ring (3) is smaller than the outer diameter of the collar (2); A driving member (4) is threadedly connected to the tail portion (105), and the shaping ring (3) is located between the collar (2) and the driving member (4).

2. A rivet that is easy to install according to claim 1, characterized in that: The calculation formula of the cross-sectional area of ​​the broken neck is as follows: ； in, is the cross-sectional area of ​​the broken neck (104), is the adjustment factor, is the cross-sectional area of ​​the broken neck of the national standard ring groove rivet, is the thread pitch diameter of the broken end (105), is the thread profile angle, is the thread friction coefficient, is the pitch of the broken tail (105).

3. A rivet that is easy to install according to claim 1, characterized in that: A lubricating layer is provided on the surface of the tail section (105).

4. A rivet that is easy to install according to claim 1, characterized in that: A third annular boss (401) corresponding to the shaping ring (3) is fixedly provided on the end surface of the driving member (4) adjacent to the shaping ring (3); A lubricating layer is provided on the upper surface of the end surface of the third annular boss (401) adjacent to the shaping ring (3).

5. The rivet that is easy to install according to claim 1, characterized in that: The driving member (4) is a multi-prism structure and is provided with a threaded hole matching the tail portion (105).

6. The rivet that is easy to install according to claim 1, characterized in that: The outer edge of the upper end of the collar (2) adopts a chamfered structure; The inner edge of the lower end of the shaping ring (3) adopts a chamfered structure; The hardness and strength of the shaping ring (3) are respectively greater than the hardness and strength of the collar (2), and the hardness and strength of the annular groove locking portion (103) are respectively greater than the hardness and strength of the collar (2).

7. The rivet that is easy to install according to claim 1, characterized in that: A first annular boss (201) is fixedly provided on the outer side of the lower end of the collar (2), and an anti-slip structure is provided on the end surface of the first annular boss (201) adjacent to the rivet head (101).

8. The rivet that is easy to install according to claim 1, characterized in that: A second annular boss (106) is fixedly provided on the outer side of one end of the rivet head (101) adjacent to the annular groove locking portion (103), and an anti-slip structure is provided on the end surface of the second annular boss (106) adjacent to the annular groove locking portion (103).

9. The rivet that is easy to install according to claim 1, characterized in that: The rivet head (101) is connected to the annular groove locking portion (103) via a rivet rod (102).

10. A riveting method, characterized in that: The following steps are involved: S1, inserting the nail body (1) through the riveting hole; S2, installing the collar (2) on the outer side of the ring groove locking portion (103), and installing the shaping ring (3) on the outer side of the tail section (105); S3, the driving member (4) is threadedly connected to the tail portion (105); S4, the driving member (4) is rotated in the tightening direction, and the shaping ring (3) moves downward to deform the collar (2) and lock the locking ring groove locking portion (103) until the broken neck (104) breaks; The rivet is the rivet described in any one of claims 1-9.

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