A press riveting nut and its scraping riveting die

Abstract

The present invention discloses a press riveting nut and a scraping riveting die thereof. Among them, the nut body of the press riveting nut is in a polygonal columnar shape or a circular columnar shape; a circular cylindrical or polygonal cylindrical inner die hole is provided in the inner die column of the scraping riveting die; the diameter of the inner die hole is smaller than the outer diameter of the nut body. When the press riveting nut with a nut body in a polygonal columnar shape is riveted to a plate, the inner die hole is in a circular cylindrical shape; when the press riveting nut with a nut body in a circular columnar shape is riveted to a plate, the inner die hole is in a polygonal cylindrical shape. The bumps formed on the outer peripheral surface of the nut body squeeze the plate between the bumps and the nut flange portion; the bumps are formed on the outer peripheral surface of the nut body by squeezing and scraping the outer peripheral surface of the nut body with the scraping riveting die. The forming process of this press riveting nut is simple, without the need for special opening and closing die forming equipment or machining turning production, with high bonding strength, reliable performance, effectively improving the processing efficiency, reducing the processing cost, and increasing the material utilization rate.

Description

Technical Field

[0001] The present invention belongs to the technical field of fastener manufacturing, and particularly relates to a press riveting nut and a die for scraping and riveting thereof. Background Art

[0002] Fasteners are a type of mechanical parts used for fastening connections and are extremely widely applied. All kinds of fasteners can be seen on various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters, and supplies, etc.

[0003] As Figure 1 shown, in the existing press riveting nut, a serrated portion 2 is provided on the upper end surface of the nut body 1, a boss portion 3 protrudes from the upper end surface of the serrated portion 2, and a groove portion 4 is formed between the serrated portion 2 and the boss portion 3. A threaded hole 5 penetrates through the boss portion, the groove portion 4, the serrated portion 2, and the nut body 1 from top to bottom.

[0004] As Figure 2 shown, during riveting, under the extrusion forces of the nut body 1, the serrated portion 2, and the press riveting punch, the sheet material 6 is extruded into the groove portion 4 to generate a force against pulling-off; meanwhile, under the extrusion forces of the nut body 1 and the press riveting punch, the sheet material 6 is pressed into the serrations 4 to generate a torque against torsion.

[0005] The existing press riveting nut has a complex structure, high processing difficulty, high cost, and low connection strength. Especially, the groove portion 4 has high processing difficulty and high cost, and special opening and closing die forming equipment or machining turning production is required. The height of the boss portion 3 generally does not exceed 1 mm, so the peeling torque after riveting is small; and in this press riveting method, it is very difficult for the sheet metal material to be smoothly extruded into the groove portion 4, so the pulling-off force after riveting is small and the connection strength is low. Summary of the Invention

[0006] To solve the problems existing in the prior art, the present invention provides a press riveting nut, the forming process of which is simple, without the need for special opening and closing die forming equipment or machining turning production, with high bonding strength, reliable performance, effectively improving the processing efficiency, reducing the processing cost, and increasing the material utilization rate.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A press riveting nut and a die for scraping and riveting thereof, the press riveting nut includes a nut body and a nut flange portion connected as a whole; the die for scraping and riveting includes an inner die column; wherein,

[0009] The nut body is in a polygonal column shape or a circular column shape;

[0010] Inner die post, with an inner die hole formed therein. The inner die hole is in the shape of a circular cylinder or a polygonal cylinder; the diameter of the inner die hole is smaller than the outer diameter of the nut body; wherein,

[0011] When the clinch nut with a polygonal columnar nut body is riveted to the plate, the inner die hole is in the shape of a circular cylinder;

[0012] When the clinch nut with a circular columnar nut body is riveted to the plate, the inner die hole is in the shape of a polygonal cylinder;

[0013] The bump formed on the outer peripheral surface of the nut body presses the plate between the bump and the nut flange; the bump is formed by squeezing and scraping the outer peripheral surface of the nut body through the scraping riveting die on the outer peripheral surface of the nut body.

[0014] For a clinch nut and its scraping riveting die as described above, the circular cylinder-shaped inner die hole is further provided with a guiding circular hole, and the guiding circular hole is formed at the junction of the circular cylinder-shaped inner die hole and the upper end surface of the inner die post.

[0015] For a clinch nut and its scraping riveting die as described above, the nut flange is set to be polygonal or circular.

[0016] The technical solution provided above has the following beneficial effects:

[0017] First, the structure of the clinch nut of the present invention is simple, and there is no need to use special opening and closing die forming equipment or machining turning production, which solves the problems of difficult processing and high cost of existing clinch nuts.

[0018] Second, the clinch nut of the present invention squeezes and scrapes the outer peripheral surface of the nut body through the scraping riveting die, so that the bump structure formed on the outer peripheral surface of the nut body presses the plate to form interference, providing sufficient tensile strength and torque. The bump structure is pressed into the plate to generate anti-torsion torque, realizing the same function as the existing flower tooth structure. The combination strength between the nut and the plate is high, the performance is reliable, the processing efficiency is effectively improved, the processing cost is reduced, and the material utilization rate is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0020] Figure 1 is a three-dimensional structural schematic diagram of an existing clinch nut;

[0021] Figure 2 is a three-dimensional sectional structural schematic diagram of an existing clinch nut after being riveted to a plate;

[0022] Figure 3 It is a three-dimensional structural schematic diagram before the scraping riveting of the press riveting nut of the present invention;

[0023] Figure 4 It is a three-dimensional structural schematic diagram of the press riveting nut of the present invention Figure 1 (hexagonal press riveting nut);

[0024] Figure 5 It is a front view structural schematic diagram after the riveting of the press riveting nut of the present invention (hexagonal press riveting nut);

[0025] Figure 6 It is a three-dimensional structural schematic diagram of the scraping riveting die of the press riveting nut of the present invention (hexagonal press riveting nut);

[0026] Figure 7 It is a three-dimensional structural schematic diagram of the combined state of the press riveting nut, the scraping riveting die and the plate of the present invention (before the scraping riveting of the hexagonal press riveting nut);

[0027] Figure 8 It is a front view of the combined state of the press riveting nut, the scraping riveting die and the plate of the present invention (after the scraping riveting of the hexagonal press riveting nut);

[0028] Figure 9 It is a front view sectional view of the combined state of the press riveting nut, the scraping riveting die and the plate of the present invention (after the scraping riveting of the hexagonal press riveting nut);

[0029] Figure 10 It is a sectional schematic diagram of the effect of the riveting state of the press riveting nut and the plate of the present invention (hexagonal press riveting nut);

[0030] Figure 11 It is Figure 10 The sectional structural schematic diagram of part A;

[0031] Figure 12 It is a three-dimensional structural schematic diagram of the press riveting nut of the present invention Figure 2 (after the scraping riveting of the quadrilateral press riveting nut);

[0032] Figure 13 It is a three-dimensional structural schematic diagram of the press riveting nut of the present invention Figure 3 (after the scraping riveting of the circular press riveting nut);

[0033] Figure 14 It is a three-dimensional structural schematic diagram of the scraping riveting die of the press riveting nut of the present invention (circular press riveting nut). Detailed implementation manners

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] In the claims, the description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, when using terms such as "first", "second" or "third", etc., they are used to distinguish different objects rather than to describe a specific order.

[0036] In the claims, the description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, for the orientation terms, when using terms such as "center", "horizontal", "vertical", "level", "vertical", "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear", "left", "right", "clockwise", "counterclockwise", etc. to indicate the orientation or position relationship, it is based on the orientation and position relationship shown in the drawings, and it is 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 or be constructed and operated in a specific orientation, so it cannot be understood as limiting the specific protection scope of the present invention.

[0037] In the claims, the description and the above-mentioned drawings of the present invention, unless otherwise clearly defined, when using the term "fixed connection" or "fixedly connected", it should be understood in a broad sense, that is, any connection method without displacement relationship and relative rotation relationship between the two, that is to say, it includes non-detachable fixed connection, detachable fixed connection, being integrated as a whole, and being fixedly connected through other devices or elements.

[0038] In the claims, the description and the above-mentioned drawings of the present invention, when using terms such as "comprising", "having" and their variants, are intended to mean "including but not limited to".

[0039] Now in combination with Figures 3 to 14 , the present invention's press riveting nut and its scraping riveting die are described. The scraping riveting die 200 includes an inner die column 210, and also includes an inner die rim 220 connected to the inner die column 210 as a whole.

[0040] The press riveting nut 100 includes a nut main body 110 and a nut rim portion 120 connected as a whole, and also includes an internal thread hole 130 coaxially passing through the nut main body 110 and the nut rim portion 120.

[0041] The nut main body 110 of the present invention is a polygonal column or a circular column. The polygonal column nut main body 110 can be designed as a quadrilateral column, a hexagonal column, an octagonal column, etc. In this embodiment, the length of the polygonal column nut main body 110 is 3 mm to 8 mm, and the opposite side dimension is 8 mm to 10 mm; the length of the circular column nut main body 100 is 3 mm to 8 mm, and the diameter dimension is 8 mm to 10 mm.

[0042] The nut rim portion 120 of the present invention is circular or polygonal. Preferably, the polygonal nut rim portion 120 can be designed as a quadrilateral, hexagon, octagon or other polygonal shapes. In this embodiment, the thickness of the polygonal nut rim portion 120 is 2 mm to 4 mm, and the across dimension is 12 mm to 16 mm; the thickness of the circular nut rim portion 120 is 2 mm to 4 mm, and the diameter dimension is 12 mm to 16 mm.

[0043] The nut body 110 of the present invention presses the sheet 300 between the bump 111A formed on the outer peripheral surface of the nut body 110 and the nut rim portion 120, forming interference. The bump 111A provides sufficient anti-pull-off force and anti-torsion torque. There is no need for special opening and closing die forming equipment or machining turning production, the processing is simple, effectively improving the processing efficiency, reducing the processing cost, and increasing the material utilization rate.

[0044] The bump 111A of the nut body 110 of the present invention is formed by squeezing and scraping the outer peripheral surface of the nut body 110 through the clinching die 200.

[0045] The inner die column 210 of the clinching die 200 of the present invention is provided with an inner die hole 211, the inner die hole 211 is a circular cylindrical shape or a polygonal cylindrical shape, and the diameter of the inner die hole 211 is smaller than the outer diameter of the nut body 110. The circular cylindrical inner die hole 211 is also provided with a guiding round hole 212, and the guiding round hole 212 is formed at the junction of the circular cylindrical inner die hole 211 and the upper end surface of the inner die column 210.

[0046] As shown in combination with Figures 7 to 13 When the press-fit nut 100 with a polygonal columnar nut body 110 is riveted to the sheet 300, the inner die hole 211 is a circular cylindrical shape. Before clinching, the nut body 110 of the press-fit nut 100 is first abutted against the guiding round hole 212 of the clinching die 200. During clinching, since the size of the circular cylindrical inner die hole of the clinching die 200 is smaller than the diagonal dimension of the polygonal outer peripheral surface of the nut body 110, when the clinching die 200 presses downward on multiple edges 111 of the polygonal columnar nut body 110, multiple bumps 111A are formed. After riveting, an interference phenomenon B is formed between the multiple bumps 111A and the sheet 300 to press the sheet 300 tightly, and the multiple bumps 111A generate anti-pull-off force and form a stable connection. Under the extrusion of the clinching die 200, part of the multiple bumps 111A is pressed into the sheet to form riveting and generate anti-torsion torque.

[0047] Please refer to the combination of Figure 14As shown, when the press riveting nut 100 with a circular columnar nut body 110 is riveted to the plate 300, the inner die hole 211 is a polygonal cylindrical shape. During scraping riveting, since the size of the polygonal cylindrical inner die hole 211 of the scraping riveting die 200 is smaller than the diameter size of the circular columnar outer peripheral surface of the nut body 110, when the scraping riveting die 200 presses downward on the circumferential surface of the circular columnar nut body 110, a plurality of convex points 111A are formed. After riveting, an interference phenomenon B is formed between the plurality of convex points 111A and the plate 300 to press the plate 300 tightly.

[0048] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the techniques or knowledge in related fields. And any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the protection scope of the appended claims of the present invention.

Claims

1. A combined tool including a press riveting nut and its scraping riveting die, characterized in that, The swaging nut (100) includes a nut body (110) and a nut flange portion (120) connected as a whole; the swaging die (200) includes an inner die post (210); wherein, The nut body (110) is in the shape of a polygonal column or a circular column; The inner die post (210) is provided with an inner die hole (211), and the inner die hole (211) is in the shape of a circular cylinder or a polygonal cylinder; the diameter of the inner die hole (211) is smaller than the outer diameter of the nut body (110); wherein, When the swaging nut (100) with a nut body (110) in the shape of a polygonal column is riveted to the plate (300), the inner die hole (211) is in the shape of a circular cylinder; When the swaging nut (100) with a nut body (110) in the shape of a circular column is riveted to the plate (300), the inner die hole (211) is in the shape of a polygonal cylinder; The bump (111A) formed on the outer peripheral surface of the nut body (110) presses the plate (300) between the bump (111A) and the nut flange portion (120); the bump (111A) is formed on the outer peripheral surface of the nut body (110) by squeezing and scraping the outer peripheral surface of the nut body (110) with the swaging die (200).

2. A combined tool comprising a press riveting nut and its scraping riveting die according to claim 1, characterized in that, The circular cylindrical inner die hole (211) is further provided with a guiding round hole (212), and the guiding round hole (212) is formed at the junction of the circular cylindrical inner die hole (211) and the upper end surface of the inner die post (210).

3. A combined tool including a press riveting nut and its scraping riveting die according to claim 1 or 2, characterized in that, The nut flange portion (120) is set to be polygonal or circular.

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