A local self-clinching fastener and method of installation

Abstract

The application discloses a local self-buckling fastener and mounting method, which comprises a body, an annular groove formed in the body at one end in the radial direction, a plurality of toothed gears sleeved on the body and fixedly connected with the body, the toothed gears being in abutment with the end surface of the annular groove, the number of toothed gear parts being multiple, the multiple toothed gear parts being arranged in the circumferential direction at intervals, and the toothed gear part closest to the side wall of the body in the multiple toothed gears and the side wall of the body corresponding to the toothed gear part having a preset distance. The plate material can flow in the radial direction after the toothed gears and the through hole are pressed to flow into the annular groove, so that the toothed gears and the through hole are tightly connected. The fastener has at least the following advantages: the fastener has a simple structure, the annular groove is arranged on the body, one toothed gear is arranged on the end surface of the annular groove, the plate material is deformed and flows into the annular groove by the toothed gear, the side of the plate material with a smaller edge distance is not extruded by the toothed gear, the edge of the plate material is prevented from being drummed or deformed, the assembly performance is stable, and the fastener can be applied to various plate materials with different shapes.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of fasteners, in particular to a local self-buckling fastener and a mounting method. BACKGROUND

[0002] With the continuous development of industry, more and more plates need to be press riveted with nuts or bolts, especially for plates with small hole-to-edge distance or bent plates, and the press riveting force needs to be strictly controlled when press riveting with nuts or bolts to avoid plate deformation. The existing press riveting nuts or press riveting bolts are generally press riveted in an integral manner, and when applied to plates with small hole-to-edge distance or bent plates, the plates will be bulged or deformed, which affects the final assembly or performance (push-out force, twist-out force, etc.) and is unstable. In addition, the local self-buckling positioning of the nut or bolt is difficult during the machining process, and accurate positioning cannot be achieved for press riveting. SUMMARY

[0003] In order to overcome the defects in the prior art, the embodiments of the application provide a local self-buckling fastener and a mounting method, which are used to solve the problems of plate deformation and positioning difficulty.

[0004] The embodiments of the application disclose a local self-buckling fastener and a mounting method. The fastener structure is simple, an annular groove is arranged on the body, a tooth is arranged on the upper end face of the annular groove, one side of the tooth near the edge of the plate is cut off, the tooth extrudes the plate during press riveting, the plate is deformed and flows into the annular groove, one side of the plate with small edge distance is not extruded by the tooth, the plate edge is prevented from being bulged or deformed, the maximum connecting thread is provided in the limited space, the assembly performance is stable, and the fastener can be applied to various plates with different shapes.

[0005] The local self-buckling fastener is used for connecting with a plate, the plate is provided with a through hole, and the local self-buckling fastener comprises:

[0006] A body, the body has two opposite ends along an axial direction and two opposite sides along a width direction;

[0007] An annular groove is formed in one end of the body in a radial direction;

[0008] A tooth is arranged on the body in a sleeved manner, the tooth is fixedly connected with the body, the tooth abuts against an end face of the annular groove, the number of tooth portions of the tooth is plural, the plural tooth portions are arranged in a circumferential direction at intervals, and a tooth portion closest to one side wall of the body in the plural tooth portions has a preset distance from the one side wall of the body corresponding to the tooth portion;

[0009] An outer diameter of the body is smaller than an inner diameter of the through hole, and an outer diameter of the tooth is greater than the inner diameter of the through hole;

[0010] The plate material can flow along the radial direction to flow into the annular groove after the flower tooth and the through hole are pressed, so as to tightly connect the flower tooth and the through hole.

[0011] Further, the plate material is a narrow edge distance plate material or a bent plate material.

[0012] Further, the flower tooth can be a straight tooth or a helical tooth.

[0013] Further, the annular groove has a circular cross section.

[0014] Further, the body is provided with an opening along the axis direction of the fastener from the side close to the annular groove, and the inner wall of the opening is provided with a thread.

[0015] Further, the ratio of the outer diameter of the flower tooth to the inner diameter of the through hole of the plate material is determined according to the thickness, material and product size of the plate material.

[0016] A mounting method of a local self-buckling fastener, comprising the following steps:

[0017] Inserting the fastener body into the through hole of the plate material from the end of the annular groove located at the lower end of the flower tooth, so that the annular groove is embedded in the through hole, and the lower end surface of the flower tooth is in contact with the upper end surface of the plate material, wherein the outer diameter of the body is smaller than the inner diameter of the through hole, and the outer diameter of the flower tooth is larger than the inner diameter of the through hole.

[0018] Placing the connected fastener and plate material in a mold and pressing the fastener to make the plate material deform and flow into the annular groove, so that the flower tooth is fixedly connected with the through hole.

[0019] Further, before the step of "inserting the fastener body into the through hole of the plate material from the end of the annular groove located at the lower end of the flower tooth", it comprises selecting a fastener body matched with the gap of the through hole according to the parameters of the through hole.

[0020] The beneficial effects of the present application are as follows:

[0021] The fastener has a simple structure, an annular groove is arranged on the body, a flower tooth is arranged on the upper end surface of the annular groove, the tooth part of the flower tooth closest to the side wall of the body and the side wall of the body corresponding to the tooth part have a preset distance, and the distance can be adjusted by the person skilled in the art according to the actual needs. When pressing, the flower tooth extrudes the plate material, so that the plate material deforms and flows into the annular groove, the side of the plate material with smaller edge distance is not extruded by the flower tooth, the edge of the plate material is prevented from being drummed or deformed, the maximum connecting thread is provided in the limited space, the assembly performance is stable, and the fastener can be applied to various plate materials with different shapes.

[0022] For the above and other objects, features and advantages of the present application, reference is made to the detailed description of the preferred embodiments thereof, and to the drawings attached hereto wherein: BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0024] Figure 1 is a sectional view schematic diagram of a partial self-fastening fastener and installation method embodiment 1 before pressing rivet in the embodiment of the present application;

[0025] Figure 2 is a sectional view schematic diagram of a partial self-fastening fastener and installation method embodiment 1 after pressing rivet;

[0026] Figure 3 is a sectional view schematic diagram of a partial self-fastening fastener and installation method embodiment 2 before pressing rivet in the embodiment of the present application;

[0027] Figure 4 is a sectional view schematic diagram of a partial self-fastening fastener and installation method embodiment 2 after pressing rivet in the embodiment of the present application;

[0028] Figure 5 is a sectional view schematic diagram of a partial self-fastening fastener and installation method embodiment 3 before pressing rivet in the embodiment of the present application;

[0029] Figure 6 is a sectional view schematic diagram of a partial self-fastening fastener and installation method embodiment 3 after pressing rivet in the embodiment of the present application;

[0030] Figure 7 is a sectional view schematic diagram of a partial self-fastening fastener and installation method embodiment 4 before pressing rivet in the embodiment of the present application;

[0031] Figure 8 is a sectional view schematic diagram of a partial self-fastening fastener and installation method embodiment 4 after pressing rivet in the embodiment of the present application.

[0032] The above drawings have the following reference signs: 1, fastener; 2, plate; 3, through hole; 4, body; 5, annular groove; 6, spline; 7, upper die; 8, lower die; 9, first light hole; 10, boss; 11, second light hole. DETAILED DESCRIPTION

[0033] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0034] The local self-buckling fastener and the installation method described in the application have simple structure. An annular groove is arranged on the fastener body, and a tooth is arranged on the upper end surface of the annular groove. The tooth is cut off on the side close to the edge of the plate. When the rivet is pressed, the tooth extrudes the plate, so that the plate is deformed and flows into the annular groove. The side of the plate with smaller edge distance is not extruded by the tooth, so that the edge of the plate is prevented from being drummed or deformed. The maximum connecting thread is provided in the limited space. The assembly performance is stable, and the fastener can be applied to plates with various shapes.

[0035] The embodiment of the application discloses a local self-buckling fastener, which is used for connecting with a plate. The plate is provided with a through hole, and comprises:

[0036] A body, the body has two opposite ends along the axial direction and two opposite sides along the width direction;

[0037] An annular groove is formed on one end of the body in the radial direction;

[0038] A tooth is arranged on the body, the tooth is fixedly connected with the body, the tooth is in contact with the end surface of the annular groove, the number of tooth parts of the tooth is plural, the plural tooth parts are arranged in the circumferential direction, and the tooth part closest to the side wall of the body in the plural tooth parts has a preset distance from the side wall of the body corresponding to the tooth part;

[0039] The outer diameter of the body is smaller than the inner diameter of the through hole, and the outer diameter of the tooth is greater than the inner diameter of the through hole;

[0040] The plate can flow in the radial direction to flow into the annular groove after the tooth and the through hole are riveted, so that the tooth and the through hole are tightly connected.

[0041] Using the above structure, the sheet metal is placed on the lower mold, and then the fastener is placed into the through hole of the sheet metal from one end near the annular groove to position the fastener and the through hole of the sheet metal. The annular groove is embedded in the through hole. Then, the upper mold presses the end face of the fastener away from the annular groove from the end of the fastener, causing the toothed part to squeeze the sheet metal, causing the sheet metal to deform and flow into the annular groove. The fastener and the sheet metal have good assembly performance, improving the riveting yield. Among the multiple toothed parts, the tooth closest to one side wall of the body has a preset distance from the corresponding side wall of the body. Those skilled in the art can adjust this preset distance according to the actual needs of the product, avoiding bulging or deformation of the sheet metal edge during the riveting process. It is applicable to sheet metal of various shapes.

[0042] Specifically, in Embodiment 1, the fastener is used to connect with the plate. The fastener is a nut.

[0043] like Figure 1 As shown, in the pre-riveting state: the plate has a through hole. The plate can be a narrow-edge plate or a bent plate. This solution can reduce the distance from the through hole to the edge of the plate by 50-60% compared to existing riveting solutions. The nut can be cylindrical. The nut includes a body and an annular groove formed radially on one side of the body. The body has an opening along the axis of the fastener from the side adjacent to the annular groove. The inner wall of the opening is threaded. The cross-section of the annular groove is circular. A toothed pattern is fitted onto the body. The toothed pattern is fixedly connected to the body. The toothed pattern can be straight teeth or helical teeth. The toothed pattern abuts against the upper end face of the annular groove. Among the multiple toothed patterns, the tooth closest to one side wall of the body has a preset distance from the corresponding side wall of the body. Those skilled in the art can adjust this preset distance according to the actual needs of the product to avoid bulging or deformation of the plate edge during the riveting process. The outer diameter of the body is smaller than the inner diameter of the through hole so that the body can be smoothly inserted into the through hole of the plate. The outer diameter of the perforated teeth is larger than the inner diameter of the through hole to prevent the nut from detaching from the plate. The plate is placed on the lower mold, and the body is inserted into the through hole from the end near the annular groove. Then, the upper mold of the mold abuts against the end of the nut away from the annular groove, and the lower mold abuts against the bottom of the plate.

[0044] like Figure 2 As shown, the riveted state is as follows: The mold performs the riveting process, and the perforated teeth are pressed against the through hole under the pressure of the upper mold. The sheet metal deforms and flows into the annular groove embedded in the through hole, thus securing the perforated teeth to the through hole. After connection, the mold is opened, the product is removed, and the riveting process is complete.

[0045] likeFigure 3 , 4 As shown, specifically in Embodiment 2, the fastener is a bolt. The bolt is used to connect to the plate. Embodiment 2 is largely the same as Embodiment 1.

[0046] Before riveting: The bolt can be cylindrical. The bolt includes a body and an annular groove formed radially on one side of the body. The body has external threads from the side adjacent to the annular groove. The cross-section of the annular groove is circular. A perforated tooth is fitted onto the body. The perforated tooth is fixedly connected to the body. The perforated tooth can be straight or helical. The perforated tooth abuts against the upper end face of the annular groove. A preset distance exists between the tooth closest to one side wall of the body and its corresponding side wall. Those skilled in the art can adjust this preset distance according to actual product needs to prevent bulging or deformation of the sheet metal edge during riveting. The outer diameter of the body is smaller than the inner diameter of the through hole so that the body can be smoothly inserted into the through hole of the sheet metal. The outer diameter of the perforated tooth is larger than the inner diameter of the through hole to prevent the nut from detaching from the sheet metal. A first light hole is provided in the lower mold, penetrating the lower mold. The first light hole is clearance-fitted with the bolt. The plate is placed on the lower mold so that the through hole of the plate corresponds to the first light hole in the lower mold. The body is then inserted into the through hole and the first light hole from the end away from the annular groove. The upper mold of the mold abuts against the end of the bolt near the annular groove, and the lower mold abuts against the bottom of the plate.

[0047] Post-riveting state: During riveting, the die presses the teeth into the through hole under the pressure of the upper die, causing the sheet metal to deform. The material flows into the annular groove embedded in the through hole, thus securing the teeth to the through hole. After connection, the die is opened, the product is removed, and the riveting process is complete.

[0048] like Figure 5 , 6 As shown, specifically in Embodiment 3, the fastener is a nut. The nut is used to connect with the plate. Embodiment 3 is largely the same as Embodiment 1.

[0049] Before the riveting state: the plate is provided with a through hole. The plate can be a narrow edge plate or a bent plate. The scheme can reduce the distance between the plate through hole and the edge by 50-60% compared with the existing riveting scheme. The nut can be cylindrical. The nut includes a body and a ring-shaped groove formed radially on one side of the body. The body is provided with an opening along the axis of the fastener from the side close to the ring-shaped groove. The inner wall of the opening is provided with threads. The cross section of the ring-shaped groove is circular. A flower tooth is sleeved on the body. The flower tooth is fixedly connected with the body. The flower tooth can be a straight tooth or a helical tooth. The flower tooth is in contact with the lower end face of the ring-shaped groove. The tooth part of the flower tooth closest to the side wall of the body and the side wall of the body corresponding thereto have a preset distance, which can be adjusted by a person skilled in the art according to the actual needs of the product to avoid the edge of the plate from bulging or deforming during riveting. The outer diameter of the body is smaller than the inner diameter of the through hole, so that the body can be smoothly inserted into the through hole of the plate. The outer diameter of the flower tooth is greater than the inner diameter of the through hole, so as to avoid the nut from being separated from the plate. The lower die of the mold is provided with a boss. The opening of the nut is gap-fitted with the boss. The opening of the nut is sleeved on the boss of the lower die to position the nut, and then the plate is sleeved on the body from the end close to the ring-shaped groove, and then the upper die is placed on the plate, so that the upper die of the mold is in contact with the upper end face of the plate, the end of the nut away from the ring-shaped groove is in contact, and the lower die is in contact with the bottom of the nut.

[0050] As Figure 2 shown, after the riveting state: the mold is riveted, the flower tooth extrudes the through hole under the pressure of the lower die, the plate deforms and flows into the ring-shaped groove embedded in the through hole, so that the flower tooth and the through hole are connected. After connection, the mold is opened, the product is taken out, and the riveting is completed.

[0051] As Figure 7 , 8 shown, specifically, in example 4, the fastener is a nut. The nut is used to connect with the plate. Example 4 is basically the same as example 1.

[0052] The plate has a through hole. The plate can be a narrow edge plate or a bent plate. The distance between the through hole of the plate and the edge of the plate can be reduced by 50-60% compared to the existing riveting scheme. The nut can be cylindrical. The nut includes a body and a ring-shaped groove formed radially on one side of the body. The body has an opening on the side adjacent to the ring-shaped groove along the axis of the fastener. The inner wall of the opening is provided with threads. The cross section of the ring-shaped groove is circular. A flower tooth is sleeved on the body. The flower tooth is fixedly connected with the body. The flower tooth can be a straight tooth or a helical tooth. The flower tooth abuts against the lower end surface of the ring-shaped groove. The tooth part of the flower tooth closest to the side wall of the body and the side wall of the body corresponding thereto have a preset distance, which can be adjusted by a person skilled in the art according to the actual needs of the product to avoid the edge of the plate from bulging or deforming during riveting. The outer diameter of the body is smaller than the inner diameter of the through hole, so that the body can be smoothly inserted into the through hole of the plate. The outer diameter of the flower tooth is greater than the inner diameter of the through hole, so as to avoid the nut from being separated from the plate. The lower die of the mold has a second light hole in the axial direction from the upper end surface, and the second light hole is in clearance fit with the nut. The nut is inserted into the second light hole from the end away from the ring-shaped groove, and then the plate is placed on the nut from the end adjacent to the ring-shaped groove, and then the upper die is placed on the plate, so that the upper die of the mold abuts against the upper end surface of the plate, and the lower die abuts against the bottom of the plate.

[0053] As shown in Figure 2 the post-riveting state: the mold is riveted, the flower tooth is extruded by the pressure of the lower die, the plate deforms and flows into the ring-shaped groove embedded in the through hole, so that the flower tooth and the through hole are tightly connected. After connection, the mold is opened, the product is taken out, and the riveting is completed.

[0054] Specifically, in this embodiment, the ratio of the outer diameter of the flower tooth to the inner diameter of the through hole of the plate is determined according to the thickness, material and size of the plate, so as to ensure that the riveting effect of the flower tooth and the through hole of the plate is best, and the deformation of the plate is smallest.

[0055] The scheme uses a flower tooth as an anti-torsion structure, and the flower tooth also acts as a material discharge mechanism. The riveting makes the deformed material of the plate flow into the ring-shaped groove, plays an anti-push role, and makes the flower tooth and the plate tightly connected. The plate can not only be a bent plate or a strip-shaped plate, but also be applied to various other shaped plates.

[0056] The application also discloses a mounting method of a local self-buckling fastener, which comprises the following steps:

[0057] Inserting the fastener body from one end along the annular groove at the lower end of the petal tooth into the through hole of the plate, so that the annular groove is embedded in the through hole, and the lower end surface of the petal tooth is in contact with the upper end surface of the plate, wherein the outer diameter of the body is smaller than the inner diameter of the through hole, and the outer diameter of the petal tooth is greater than the inner diameter of the through hole;

[0058] Placing the connected fastener and the plate in a mold and pressing the rivet to deform the plate into the annular groove, so that the petal tooth is fixedly connected with the through hole.

[0059] The installation method deforms the plate into the annular groove by pressing the rivet, and the side of the plate with smaller margin is not pressed by the petal tooth, avoiding the drumming or deformation of the edge of the plate, providing the maximum connecting thread in limited space, and providing stable assembly performance

[0060] Specifically, in the embodiment, before the step of "inserting the fastener body from one end along the annular groove at the lower end of the petal tooth into the through hole of the plate", the fastener body is selected to fit the gap of the through hole according to the parameters of the through hole, so that the body can be inserted into the through hole.

[0061] The principles and implementation modes of the present application are described in the specific embodiments, and the above embodiment is only used to help understand the technical solutions and core ideas of the present application; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as the limitation of the present application.

Claims

1. A local self-clinching fastener for joining a panel having a through hole, characterized in that, The fastener comprises: a body having two axially opposite ends and two widthwise opposite sides; a ring-shaped groove formed radially at one end of the body; a flower-shaped tooth sleeved on the body, the tooth being fixedly connected with the body, the tooth being in abutment with the end face of the ring-shaped groove, the tooth having a plurality of tooth portions arranged in circumferential direction, the tooth portion closest to the side wall of the body and the corresponding side wall of the body having a preset distance, and the side of the tooth adjacent to the edge of the plate being cut off; an outer diameter of the body being smaller than an inner diameter of the through hole, and an outer diameter of the tooth being larger than the inner diameter of the through hole; the plate being able to flow radially into the ring-shaped groove after being pressed into the tooth and the through hole, so that the tooth is fixedly connected with the through hole.

2. The local self-fastening fastener according to claim 1, wherein The plate is a narrow-margin plate or a bent plate.

3. The local self-fastening fastener of claim 1, wherein, The tooth is a straight tooth or an inclined tooth.

4. The local self-fastening fastener of claim 1, wherein, The cross section of the ring-shaped groove is circular.

5. The local self-fastening fastener of claim 1 wherein, The body is provided with an opening along the axial direction of the fastener from the side adjacent to the ring-shaped groove, and the inner wall of the opening is provided with a thread.

6. The local self-fastening fastener of claim 1, wherein, The ratio of the outer diameter of the tooth to the inner diameter of the through hole of the plate is determined according to the thickness, material and size of the plate.

7. A method of installing a local self-fastening fastener as claimed in any one of claims 1 to 6, characterised in that, The method comprises the following steps: inserting the body of the fastener into the through hole of the plate from the end of the ring-shaped groove below the tooth, so that the ring-shaped groove is embedded in the through hole, and the lower end face of the tooth is in abutment with the upper end face of the plate, wherein the outer diameter of the body is smaller than the inner diameter of the through hole, and the outer diameter of the tooth is larger than the inner diameter of the through hole; placing the connected fastener and plate in a mold and pressing them to make the plate deform and flow into the ring-shaped groove, so that the tooth is fixedly connected with the through hole.

8. The method of installing a local self-fastening fastener according to claim 7, wherein, Before the step of inserting the body of the fastener into the through hole of the plate from the end of the ring-shaped groove below the tooth, the body of the fastener that matches the gap of the through hole is selected according to the parameters of the through hole.

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