One-side rivet and riveting method

Abstract

The present invention provides a single-sided rivet and a riveting method, comprising: a rivet body, the rivet body comprising a rivet head, an annular groove locking part, a broken neck part, and a broken tail part connected in sequence, the broken tail part being provided with a locking structure; a collar, the inner diameter of the collar being larger than the outer diameter of the annular groove locking part, the collar being installed on the outer side of the annular groove locking part, the collar comprising a locking part and a deformation part connected in sequence, the wall thickness of the deformation part being smaller than the wall thickness of the locking part, a first annular boss being fixed on the outer side of one end of the locking part adjacent to the deformation part; a shaping ring, the inner diameter of the shaping ring being smaller than the outer diameter of the collar. Beneficial effects of the present invention: the first annular boss limits the rivet for easy installation, the strength of the shaping ring is greater than the strength of the collar, the shaping ring will not separate from the collar after riveting is completed, and the rivet can be prevented from loosening due to deformation of the collar during use.

Description

Technical Field

[0001] The invention belongs to the technical field of riveting, and in particular relates to a single-side rivet and a riveting method. Background Art

[0002] The annular groove single-sided rivet is 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 collar. 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 collar is put on the high-strength core rod from the other side. Under the action of axial tensile force and radial extrusion force, the collar is plastically extruded into the annular groove of the core rod to form a permanent and non-detachable connection.

[0003] Since the riveting of single-sided ring groove rivets requires a large tensile load, except for ring groove rivets with a nominal diameter of 6 mm, 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 single-sided 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, such as the installation of tower structures, photovoltaic bracket structures, and railways. In scenarios such as string installation that require assembly in the air or on-site, it is obviously impossible to lift the bulky hydraulic station into the air or carry it around for use, which limits 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 in 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 using hydraulic pull rivets, and the riveting time usually takes 0.5s-1s. The material strain rate is low, so there is a lot of room for improvement in the riveting quality. Summary of the invention

[0005] In view of this, the present invention aims to provide a single-sided rivet and a riveting method, 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:

[0007] A first aspect of the present invention provides a single-sided rivet, comprising:

[0008] 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;

[0009] A collar, wherein the inner diameter of the collar is larger than the outer diameter of the annular groove locking portion, the collar is installed on the outer side of the annular groove locking portion, the collar comprises a locking portion and a deforming portion connected in sequence, the wall thickness of the deforming portion is smaller than the wall thickness of the locking portion, and a first annular boss is fixedly disposed on the outer side of one end of the locking portion adjacent to the deforming portion;

[0010] A shaping ring, wherein the inner diameter of the shaping ring is smaller than the outer diameter of the sleeve ring.

[0011] Furthermore, the locking structure is a threaded structure;

[0012] The single-sided rivet also includes a driving member, which is threadedly connected to the tail portion, and the shaping ring is installed between the driving member and the collar.

[0013] Furthermore, a clamping plane is formed on the side wall of the first annular boss.

[0014] Furthermore, a positioning boss is fixedly provided on the end surface of the rivet head adjacent to the collar, and a positioning groove corresponding to the positioning boss is fixedly provided on the end surface of the deformation portion of the collar adjacent to the rivet head, and the positioning boss is located on the inner side of the positioning groove.

[0015] Furthermore, a lubricating layer is provided on the surface of the broken tail portion;

[0016] A second annular boss corresponding to the shaping ring is fixedly provided on the end surface of the driving member adjacent to the shaping ring;

[0017] A lubricating layer is provided on the upper surface of the end surface of the second annular boss adjacent to the shaping ring.

[0018] Furthermore, the driving member is a polygonal column structure, and the driving member is provided with a threaded hole matching the broken tail portion.

[0019] Furthermore, the outer edge of the upper end of the collar adopts a chamfered structure;

[0020] The inner edge of the lower end of the shaping ring adopts a chamfered structure;

[0021] 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.

[0022] Furthermore, an anti-slip structure is provided on the end surface of the first annular boss adjacent to the rivet head.

[0023] Furthermore, the rivet head is connected to the annular groove locking portion through a rivet rod;

[0024] The length of the deformation portion is greater than the length of the locking portion.

[0025] A second aspect of the present invention provides a riveting method, comprising the following steps:

[0026] S1. Install the collar and the shaping ring on the outside of the nail body in sequence, and connect the driving part with the broken tail part through threads to form a rivet;

[0027] S2, inserting the rivet through the riveting hole, so that the first annular boss contacts the end surface of the part to be riveted;

[0028] S3, clamping the first boss and rotating the driving member in the tightening direction, so that the deformed portion of the collar deforms outward to form a third annular boss, and the end surface of the third annular boss adjacent to the first boss presses against the part to be riveted;

[0029] S4, continue to rotate the driving member in the tightening direction, and the locking portion of the collar deforms inward to lock the ring groove locking portion of the nail body until the broken neck breaks;

[0030] The rivet is the single-sided rivet described in the first aspect.

[0031] Compared with the prior art, the one-sided rivet and riveting method described in the present invention have the following beneficial effects:

[0032] (1) In the single-sided rivet described in the present invention, the first annular boss limits the rivet for easy installation. The strength of the shaping ring is greater than the strength of the sleeve. After riveting, the shaping ring will not separate from the sleeve, which can prevent the rivet from loosening due to deformation of the sleeve during use.

[0033] (2) The one-sided rivet described in the present invention 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 requires a wrench to complete the riveting. Compared with traditional hydraulic riveting, the work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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:

[0035] Figure 1 This is a schematic diagram of the three-dimensional structure of a rivet according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the cross-sectional structure of a rivet according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the three-dimensional structure of a nail body according to an embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the cross-sectional structure of a nail body according to an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the three-dimensional structure of the sleeve ring according to an embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of the cross-sectional structure of a rivet in the riveting process described in an embodiment of the present invention.

[0041] Description of reference numerals:

[0042] 1. Nail body; 2. Ring; 3. Shaping ring; 4. Driving member; 5. Part to be riveted; 101. Rivet head; 102. Nail rod; 103. Ring groove locking part; 104. Broken neck; 105. Broken tail; 106. Positioning boss; 201. First annular boss; 202. Positioning groove; 203. Clamping plane; 204. Third annular boss; 205. Locking part; 206. Deformation part; 401. Second annular boss. DETAILED DESCRIPTION

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0047] like Figures 1 to 5 As shown, a single-sided rivet comprises:

[0048] The nail body 1 comprises a rivet head 101, an annular groove locking portion 103, a broken neck portion 104, and a broken tail portion 105 which are connected in sequence, and a locking structure is provided on the broken tail portion 105; the ring 2, the inner diameter of the ring 2 is larger than the outer diameter of the annular groove locking portion 103, the ring 2 is installed on the outer side of the annular groove locking portion 103, the ring comprises a locking portion 205 and a deforming portion 206 which are connected in sequence, the wall thickness of the deforming portion 206 is smaller than the wall thickness of the locking portion 205, and a first annular boss 201 is fixedly provided on the outer side of one end of the locking portion 205 adjacent to the deforming portion 206; the shaping ring 3, the inner diameter of the shaping ring 3 is smaller than the outer diameter of the ring 2, the inner diameter of the shaping ring 3 is larger than the inner diameter of the ring 2, and the outer diameter of the shaping ring 3 is larger than the outer diameter of the ring 2.

[0049] In some embodiments, the locking structure is a plurality of annular grooves, and the plurality of annular grooves are located on the outer side wall of the tail portion 105. After the riveting tool passes through the locking annular grooves, it pushes the shaping ring 3 downward to deform the collar 2 and lock the annular groove locking portion 103.

[0050] In other embodiments, the locking structure of the broken tail portion 105 is a threaded structure, and 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.

[0051] 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.

[0052] 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.

[0053] The single-sided rivet also includes a driving member 4, which is threadedly connected to the broken tail portion 105, and the shaping ring 3 is installed between the driving member 4 and the ring 2. The driving member 4 is a hexagonal prism structure, and the driving member 4 is provided with a threaded hole matching the broken tail portion 105.

[0054] A clamping plane 203 is formed on the side wall of the first annular boss 201 . The clamping plane 203 is designed to facilitate radial positioning of the collar 2 using a wrench.

[0055] A positioning boss 106 is fixedly provided on the end surface of the rivet head 101 adjacent to the collar 2, and a positioning groove 202 corresponding to the positioning boss 106 is fixedly provided on the end surface of the deformation portion 206 of the collar 2 adjacent to the rivet head 101, and the positioning boss 106 is located inside the positioning groove 202. The positioning groove 202 positions the positioning boss 106 to prevent relative rotation between the collar 2 and the rivet.

[0056] A lubricating layer is provided on the surface of the broken tail portion 105 ; the lubricating layer adopts but is not limited to the existing MoS2 coating, which reduces the friction between the broken tail portion 105 and the driving member 4 .

[0057] A second 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 second annular boss 401 adjacent to the shaping ring 3, and the lubricating layer adopts but is not limited to the existing MoS2 coating. The provision of the lubricating layer reduces the friction between the second annular boss 401 and the shaping ring 3. The inner and outer edges of the shaping ring 3 adjacent to the driving member 4 are both chamfered to reduce the contact surface with the third annular boss 204, thereby reducing the friction.

[0058] 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 chamfered structure of the collar 2 and the chamfered structure of the shaping ring 3 play a guiding role in the process of the shaping ring 3 moving downward, making it easier for the collar 2 to enter the inner side of the shaping ring 3. The hardness and strength of the shaping ring 3 are greater than the hardness and strength of the collar 2, respectively, and the hardness and strength of the ring groove locking portion 103 are greater than the hardness and strength of the collar 2, respectively.

[0059] An anti-skid structure is provided on the end surface of the first annular boss 201 adjacent to the rivet head 101 . The anti-skid structure may be an anti-skid pattern or a rubber pad.

[0060] The rivet head 101 is connected to the annular groove locking portion 103 via the rivet rod 102 ; the length of the deformation portion 206 is greater than the length of the locking portion 205 .

[0061] The material of the rivet remains unchanged, and the equivalent uniaxial stress of the ring groove rivet that breaks under tension and torsion load should be equal to the cross-sectional area of ​​the broken neck of the national standard ring groove rivet:

[0062] ;

[0063] In order to ensure the same riveting quality, the riveting loads of the two must be the same, that is, , combined to get:

[0064] ;

[0065] The broken neck ring groove area of ​​the ring groove rivet is:

[0066] ;

[0067] For the same cross-sectional area, the tensile stress Torsional shear stress The relationship satisfies the formula:

[0068] ;

[0069] The calculation formula of the cross-sectional area of ​​the broken neck is as follows:

[0070] ;

[0071] 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.

[0072] By increasing the diameter of the broken neck, the preload force of the ring groove rivet that breaks under tension and torsion load is consistent with that of the national standard product.

[0073] 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.

[0074] 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.

[0075] 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:

[0076] Table 1 Recommended screw tail threads for different specifications of ring groove rivets

[0077] Rivet nominal diameter (mm) Number of screw tail threads 6~10 3 12~14 2 ≥16 1

[0078] like Figure 6 As shown, a riveting method comprises the following steps:

[0079] S1, sequentially install the collar 2 and the shaping ring 3 on the outside of the nail body 1, and the driving member 4 is threadedly connected with the broken tail 105 to form a rivet;

[0080] S2, insert the rivet through the riveting hole, and the first annular boss 201 contacts the end surface of the riveted part 5 (such as Figure 6 shown in the upper left figure);

[0081] S3, clamp the first boss and rotate the driving member 4 in the tightening direction, the deformed portion 206 of the collar 2 deforms outward to form a third annular boss 204, and the end surface of the third annular boss 204 adjacent to the first boss presses against the riveted member 5 (such as Figure 6 as shown in the upper right picture);

[0082] S4, continue to rotate the driving member 4 in the tightening direction, the locking portion 205 of the collar 2 deforms inwardly to lock the annular groove locking portion 103 of the nail body 1 (such as Figure 6 As shown in the lower left figure), until the neck 104 breaks (as shown in the lower left figure) Figure 6 The rivet is the above-mentioned single-sided rivet. The broken tail portion 105 and the driving member 4 can be separated and then recycled to reuse the driving member 4, and the broken tail portion 105 can be directly discarded, or the broken tail portion 105 and the driving member 4 can be directly discarded together.

[0083] 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.

[0084] 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.

[0085] 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 single-side rivet riveting method, characterized in that: Single-sided rivets 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) which are connected in sequence, and a locking structure is provided on the broken tail portion (105); A collar (2), wherein the inner diameter of the collar (2) is larger than the outer diameter of the annular groove locking portion (103), the collar (2) is mounted on the outer side of the annular groove locking portion (103), the collar (2) comprises a locking portion (205) and a deforming portion (206) which are connected in sequence, the wall thickness of the deforming portion (206) is smaller than the wall thickness of the locking portion (205), and a first annular boss (201) is fixedly provided on the outer side of one end of the locking portion (205) adjacent to the deforming portion (206); A shaping ring (3), wherein the inner diameter of the shaping ring (3) is smaller than the outer diameter of the sleeve ring (2); The locking structure is a threaded structure; The single-sided rivet further comprises a driving member (4), wherein the driving member (4) is threadedly connected to the broken tail portion (105), and the shaping ring (3) is installed between the driving member (4) and the collar (2); The broken neck ring groove area of ​​the ring groove rivet is: ； in, is the cross-sectional area of ​​the broken neck, It is the cross-sectional area of ​​the broken neck of the national standard ring groove rivet; A clamping plane (203) is formed on the side wall of the first annular boss (201); A positioning boss (106) is fixedly provided on the end surface of the rivet head (101) adjacent to the collar (2); a positioning groove (202) corresponding to the positioning boss (106) is fixedly provided on the end surface of the deformation portion (206) of the collar (2) adjacent to the rivet head (101); and the positioning boss (106) is located on the inner side of the positioning groove (202); A lubricating layer is provided on the surface of the tail section (105); A second 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 second annular boss (401) adjacent to the shaping ring (3); The driving member (4) is a multi-prism structure, and the driving member (4) is provided with a threaded hole matching the tail portion (105); 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); An anti-slip structure is provided on the end surface of the first annular boss (201) adjacent to the rivet head (101); The rivet head (101) is connected to the annular groove locking portion (103) via a rivet rod (102); The length of the deformation portion (206) is greater than the length of the locking portion (205); The single-side rivet riveting method comprises the following steps: S1, sequentially installing the collar (2) and the shaping ring (3) on the outer side of the nail body (1), and threading the driving member (4) and the tail portion (105) to form a rivet; S2, inserting a rivet through the riveting hole, so that the first annular boss (201) contacts the end surface of the part to be riveted (5); S3, clamping the first boss and rotating the driving member (4) in the tightening direction, so that the deformation portion (206) of the collar (2) deforms outward to form a third annular boss (204), and the end surface of the third annular boss (204) adjacent to the first boss presses against the part to be riveted (5); S4, the driving member (4) is continuously rotated in the tightening direction, and the locking portion (205) of the collar (2) is deformed inwardly to lock the annular groove locking portion (103) of the nail body (1) until the broken neck portion (104) breaks; The strength of the shaping ring (3) is greater than the strength of the sleeve ring (2), and the shaping ring (3) will not separate from the sleeve ring (2) after riveting is completed.

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