Method and apparatus for forming a twist-resistant clinch

Abstract

The application provides a forming method and a forming device of a twist-proof riveting piece. The forming method of the twist-proof riveting piece is characterized in that a blank for forming a rivet nut is cold upset for multiple times, and the structures of different parts of the blank are formed by cold upsetting for multiple times to form a rod body, a flange, a groove arranged on the flange, a limiting rib arranged in the groove, and a hole structure arranged on the rod body on the rivet nut. The structures are formed by cold upsetting for multiple times. Compared with a scheme of forming the structures by cold upsetting for one time, the forming method can effectively reduce the cracks generated in the rivet nut and invisible to the naked eye, thereby improving the yield of products.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fastener production, and more particularly to a forming method and forming device of a twist-proof riveting piece. BACKGROUND

[0002] The turn riveting nut is also called a riveting nut and a self-buckling nut, and is a kind of nut applied to a sheet or a sheet metal. The turn riveting nut is riveted with a single metal sheet to fix the turn riveting nut on the metal sheet, or is riveted with multiple stacked metal sheets to fix multiple sheet pieces into a whole to prevent the multiple sheet pieces from being separated from each other.

[0003] In the production of existing nuts, some turn riveting nuts are produced by processes such as blanking, burr removing, cold heading, and electroplating. In the cold heading process, the turn riveting nut is mostly formed in one step. Thus, the problem is that the technical solution of cold heading for one-step forming of the turn riveting nut is prone to form cracks invisible to the naked eye, and the yield rate needs to be improved. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a forming method and forming device of a twist-proof riveting piece to solve the technical problem of the yield rate of the turn riveting nut produced by cold heading in the prior art needing to be improved.

[0005] To achieve the above-mentioned purpose, the first aspect of the present application provides a forming method and forming device of a twist-proof riveting piece for processing a turn riveting nut, the turn riveting nut comprising a rod body, a flange protruding on the rod body, one side of the flange being provided with a groove, a plurality of limiting ribs being arranged in the groove, and the rod body being provided with a hole structure. The forming method and forming device of the twist-proof riveting piece comprise the following steps:

[0006] Step 1. Cutting a wire into a preset blank;

[0007] Step 2. Cold heading the preset blank by using a first die to make the preset blank form a first transition blank in a cylindrical structure, and cold heading a first transition groove of a first size on the first transition blank;

[0008] Step 3. Cold heading the first transition blank by using a second die, making the first transition groove form a second transition groove of a second size, and cold heading a first transition flange on the first filter blank to make the first transition blank form a second transition blank;

[0009] Step 4. Cold heading the second transition blank by using a third die, cold heading a third transition groove of a third size on the second groove, and cold heading the first transition flange to form a second transition flange, so as to make the second filter blank form a third transition blank;

[0010] Step 5. cold heading the third transition blank by using the fourth cold heading die, and cold heading the hole structure on the third transition groove, and cold heading the second transition flange to form the flange, and cold heading the groove and the limiting rib on one side of the flange to form the flanged rivet nut.

[0011] Optionally, the first cold heading die, the second cold heading die, the third cold heading die and the fourth cold heading die are arranged in sequence.

[0012] Optionally, the first transition groove and the second transition groove are both uniformly shaped as a circular truncated cone.

[0013] Optionally, the hole structure is a through hole or a blind hole.

[0014] Optionally, the first size includes a first length size and a first radial magnetic size.

[0015] The second size includes a second length size and a second radial size, the second length size is greater than the first length size, and the second radial size is greater than the first radial size.

[0016] The third size includes a third length size and a third radial size, the third length size is greater than the second length size, and the third radial size is greater than the second radial size.

[0017] The forming method of the anti-twist riveting piece provided in the present application has the following beneficial effects: compared with the prior art, the forming method and forming device of the anti-twist riveting piece provided in the present application can effectively reduce the cracks generated in the rivet nut and invisible to the naked eye, thereby improving the yield of the product, by cold heading the blank for forming the flanged rivet nut multiple times, and cold heading the structures of different parts of the blank multiple times to form the stem, the flange, the groove arranged on the flange, the limiting rib arranged in the groove and the hole structure arranged on the stem, and by cold heading multiple times to form the above structures, compared with the scheme of cold heading the above structures once, the cracks generated in the rivet nut and invisible to the naked eye can be effectively reduced, thereby improving the yield of the product.

[0018] The second aspect of the present application is to provide a forming device of an anti-twist riveting piece, which includes a first cold heading die, a second cold heading die, a third cold heading die and a fourth cold heading die arranged in sequence.

[0019] The forming device of the anti-twist riveting piece provided by the application has the beneficial effect that, compared with the prior art, the forming device of the anti-twist riveting piece provided by the application cold-headers the blank for forming the pop rivet nut multiple times through the first cold-header die, the second cold-header die, the third cold-header die and the fourth cold-header die to form the rod body, the flange, the groove arranged on the flange, the limiting rib arranged in the groove and the hole structure arranged on the rod body, and the above-mentioned structures are formed through multiple cold-heading, which can effectively reduce the cracks generated in the pop rivet nut and invisible to the naked eye, thereby improving the yield of the product. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 Structure diagram of the pop rivet nut provided by the embodiments of the application Figure 1

[0022] Figure 2 Structure diagram of the pop rivet nut provided by the embodiments of the application Figure 2

[0023] Figure 3 Structure diagram of the first transition blank provided by the embodiments of the application

[0024] Figure 4 Structure diagram of the second transition blank provided by the embodiments of the application

[0025] Figure 5 Structure diagram of the third transition blank provided by the embodiments of the application

[0026] In the drawings, various reference signs represent:

[0027] 10, pop rivet nut; 11, rod body; 12, flange; 13, groove; 14, limiting rib; 15, hole structure; 20, first transition blank; 21, first transition groove; 30, second transition blank; 31, second transition groove; 32, first transition flange; 40, third transition blank; 41, third transition groove; 42, second transition flange. EMBODIMENT

[0028] ​​In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and not to limit the present application.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0030] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0032] Please refer to Figures 1 to 5 for the forming method and forming device of the anti-twist riveting piece provided by the embodiments of the present application.

[0033] The first aspect of the present application is to provide a production process of a turn rivet nut 10, the turn rivet nut 10 comprising a rod body 11, a flange 12 protruding from the rod body 11, one side of the flange 12 being provided with a groove 13, a plurality of limiting ribs 14 being arranged in the groove 13, and the rod body 11 being provided with a hole structure 15. The production process of the turn rivet nut 10 comprises the following steps:

[0034] Step 1. Cutting a wire into a preset blank;

[0035] Step 2. Cold heading the preset blank by using a first die to form a first transition blank 20 in a cylindrical structure, and cold heading a first transition groove 21 of a first size on the first transition blank 20;

[0036] Step 3. The first transition blank 20 is cold upset by using the second die, and the first transition groove 21 is formed into a second transition groove 31 of a second size, and the first transition flange 32 is cold upset on the first filter blank to form a second transition blank 30 from the first transition blank 20;

[0037] Step 4. The second transition blank 30 is cold upset by using the third die, and the second transition groove is cold upset to form a third transition groove 41 of a third size, and the first transition flange 32 is cold upset to form a second transition flange 42, so that the second filter blank is formed into a third transition blank 40;

[0038] Step 5. The third transition blank 40 is cold upset by using the fourth cold upset die, and the third transition groove 41 is cold upset to form the hole structure 15, and the second transition flange 42 is cold upset to form the flange 12, and the groove 13 and the limiting rib 14 are cold upset on one side of the flange 12 to form the rivet nut 10.

[0039] Compared with the prior art, the rivet nut 10 production process provided by the application can effectively reduce the cracks generated inside the rivet nut 10 and invisible to the naked eye, thereby improving the yield of the product, by cold upsetting the blank multiple times for forming the rivet nut 10, and cold upsetting the structures of different parts of the blank multiple times to form the shank 11, the flange 12, the groove 13 provided on the flange 12, the limiting rib 14 provided in the groove 13, and the hole structure 15 provided on the shank 11.

[0040] It should be noted that the first cold upset die, the second cold upset die, the third cold upset die, and the fourth cold upset die are arranged in sequence to facilitate the blank entering the corresponding cold upset die quickly.

[0041] In the application, the first transition groove 21 and the second transition groove 31 are uniformly shaped as a circular truncated cone. The hole structure 15 is a through hole or a blind hole. The first size includes a first length size and a first radial size. The second size includes a second length size and a second radial size, the second length size being greater than the first length size, and the second radial size being greater than the first radial size. The third size includes a third length size and a third radial size, the third length size being greater than the second length size, and the third radial size being greater than the second radial size.

[0042] In a second aspect, the application provides a forming device for forming the anti-twist rivet, which includes a first cold upset die, a second cold upset die, a third cold upset die, and a fourth cold upset die arranged in sequence.

[0043] Compared with the prior art, the forming device for the anti-twist riveting piece can effectively reduce the cracks generated in the riveting nut and invisible to the naked eye, thereby improving the yield of the product.

[0044] The above are only preferred embodiments of the present application and are not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A forming method of a twist-proof riveting piece, the riveting nut comprising a rod body, a flange protruding on the rod body, one side of the flange being provided with a groove, a plurality of limiting ribs being arranged in the groove, and the rod body being provided with a hole structure, characterized in that, The forming method and forming device of the anti-twist rivet include the following steps: Step 1. Cutting a wire into a preset blank; Step 2. Cold heading the preset blank by using a first cold heading die to make the preset blank form a first transition blank in a cylindrical structure, and cold heading a first transition groove with a first size on the first transition blank; Step 3. Cold heading the first transition blank by using a second cold heading die to make the first transition groove form a second transition groove with a second size, and cold heading a first transition flange on the first transition blank to make the first transition blank form a second transition blank; Step 4. Cold heading the second transition blank by using a third cold heading die to cold head a third transition groove with a third size on the second transition groove, and cold head the first transition flange to form a second transition flange, so as to make the second transition blank form a third transition blank; Step 5. Cold heading the third transition blank by using a fourth cold heading die to cold head the hole structure on the third transition groove, and cold head the second transition flange to form the flange, and cold head the recess and the limiting rib on one side of the flange to form the flanged rivet nut; The first cold heading die, the second cold heading die, the third cold heading die and the fourth cold heading die are arranged in sequence; The shapes of the first transition groove and the second transition groove are both circular truncated cone.

2. The method of claim 1, wherein The hole structure is a through hole or a blind hole.

3. The forming method of the anti-torsion riveted part as described in claim 1, characterized in that, The first size includes a first length size and a first radial size; The second size includes a second length size and a second radial size, the second length size is greater than the first length size, and the second radial size is greater than the first radial size; The third size includes a third length size and a third radial size, the third length size is greater than the second length size, and the third radial size is greater than the second radial size.

4. A molding device for molding the anti-twist rivet according to any one of claims 1 to 3, which implements the molding method of claim 4, characterized by, The forming device includes the first cold heading die, the second cold heading die, the third cold heading die and the fourth cold heading die arranged in sequence.

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