TWM604245U - Twill molding die structure for riveting nut - Google Patents

Abstract

A twill forming die structure for a riveting nut includes a forging die seat, a first forging die, a second forging die, and a limiting piece; the forging die seat is made with a cavity, and the cavity is provided with a threaded portion; The first forging die has a nut die cavity and a forging die cavity. The nut die cavity penetrates the forging die cavity, forming a diagonal shoulder between the two; the front end of the second forging die is provided with a beveled surface, and the inner surface has a diagonal line and Through the guide hole, the oblique part is composed of a plurality of oblique convex teeth; the second forging die is placed in the forging die cavity and the first forging die is placed in the cavity, and the limit piece is restricted in the cavity, and the The second forging die and the forging die cavity form low-friction contact. The flange of the nut blank will be directly compression molded on the diagonal part of the second forging die to form diagonal protruding teeth. When the mold is withdrawn, the second forging die will easily rotate on its own with the oblique protruding teeth in the diagonal part, and finally make the protruding The edge was smoothly released from the second forging die.

Description

Twill molding die structure for riveting nut

This creation relates to a riveting nut forming mold structure, in particular to the creation of a riveting nut forming mold structure that can directly form diagonal convex teeth on a nut forming machine in the continuous forming process of the riveting nut.

The riveting nut is a kind of metal sheet material, which is bonded to the anchor hole of the sheet after pressure riveting, so as to provide a connecting member that is screwed and fixed by bolts. As shown in Figure 1, there is a conventional riveting nut (10) with diagonal teeth. The riveting nut (10) mainly includes a nut body (11) and a flange (13). A screw hole (14) with internal threads penetrates the nut main body (11) and a flange (13), wherein the outer surface of the flange (13) is provided with equidistantly arranged diagonal convex teeth (15), The diagonal convex tooth (15) is protruding on the outer surface of the flange (13) in an angle inclined manner, which is different from the conventional design of axial parallel convex tooth; the diagonal convex tooth (15) can improve the riveting screw The friction between the cap and the plate not only has the function of preventing the riveting nut from rotating, but also has the function of preventing the riveting nut from coming off axially.

The production process of conventional riveted nuts is mainly carried out in conjunction with the commonly used nut forming machines in the industry. A series of molds set up in the nut forming machines are used to make the blanks pass through several forging and shaping procedures, and then form The rudimentary shape of a nut with a flange shape. However, since the forging action of the nut forming machine is mostly an axial stroke, the nut forming machine is only suitable for processing riveted nuts with straight convex teeth. If it is in the conventional nut In the molding machine, the diagonal protruding teeth are formed by forging and pressing with traditional molds. Naturally, they are limited by the interference between the diagonal protruding teeth and the mold and it is difficult to directly release the film. The processed object or the mold will be easily damaged under forced release. In the industry, forming diagonal convex teeth is mainly achieved through a knurling process.

From the above description, it can be seen that the conventional twill convex tooth riveted nut cannot be directly processed and formed by the existing nut forming machine, and needs to be processed twice through the knurling process, so the overall production efficiency is greatly reduced, which greatly affects the production volume . Therefore, how to improve the forming efficiency of the diagonal convex teeth, it is necessary for the related industry to explore the better processing process or the improvement of the mold equipment.

For this reason, the main purpose of this creation is to provide a mold structure that can directly form the diagonal convex teeth of a riveted nut on a nut forming machine, which can effectively improve production efficiency and greatly increase the production of diagonal convex riveted nuts. .

In order to achieve the above-mentioned purpose, the technical means proposed in this creation is to provide a twill forming die structure for riveting nuts, including a forging die seat, a first forging die, a second forging die and a stopper; The mold base is made with a mold cavity, the mold cavity is provided with a threaded portion; the first forging mold is made with a nut cavity and a forging die cavity, the nut cavity passes through the forging die cavity, and an oblique shoulder is formed between the two; The second forging die is placed in the forging die cavity, the front end of the second forging die is provided with a beveled surface, the inner surface is formed with a diagonal portion and a through hole, and the diagonal portion is composed of a plurality of diagonal convex teeth; The first forging die and the second forging die are placed in the cavity, and the stopper is matched to restrict the first forging die and the second forging die in the cavity, and the second forging die and the forging die cavity are formed Low friction contact.

In the aforementioned diagonal pattern forming mold structure of the riveting nut, the inclined surface corresponds to the inclination of the inclined shoulder.

In the structure of the twill forming die for the riveting nut, the outer wall of the second forging die is not in contact with the inner wall of the forging die cavity.

In the above-mentioned twill molding die structure of the riveting nut, the overall height of the second forging die is greater than 99.5% and less than the depth of the forging die cavity.

In the above-mentioned diagonal pattern forming mold structure of the riveting nut, the inclination angle of the diagonal convex teeth is between 35° and 45°.

The flange of the nut blank will be directly compression molded to form the diagonal protruding teeth on the diagonal part of the second forging die. When the mold is withdrawn, the second forging die is in low friction contact with the forging die cavity. 2 The forging die can easily rotate with the inclination of the oblique convex teeth of the diagonal part, and finally the flange is smoothly released from the second forging die. Based on this, this creation breaks through the lack of the diagonal convex teeth of the riveted nut that cannot be directly processed by the conventional nut processing machine. It can also omit the secondary processing of the knurling process, thereby greatly improving the production of the diagonal riveted nut. the amount.

In order to make the structural features, efficacy and other advantages of this creation can be further improved Solution, a detailed description is given below with preferred embodiments and drawings.

First of all, please refer to Figure 2, which is a preferred embodiment of the structure of the twill forming die for the creative riveting nut. It is mainly composed of a forging die holder (20), a first forging die (30) and a first forging die. 2 forging die (40); the forging die seat (20) is made with a cavity (21), which is provided to accommodate the first forging die (30) and a second forging die (40), the first forging die (30) A forging die cavity (31) is provided for accommodating the second forging die (40), the second forging die (40) is similar in appearance to the forging die cavity (31), but a dimensional tolerance is preset; the A threaded part (22) is provided in the cavity (21) near the open end, and a stopper (23) is screwed on the threaded part (22), and the first forging die (30) and the second forging The mold (40) is confined in the cavity (21).

Please refer to Figure 3 again, which is a schematic cross-section of the structure of the twill molding die structure of the creative riveting nut shown in Figure 2. The first forging die (30) has a forging die cavity (31) and a The nut die cavity (32), the nut die cavity (32) penetrate the forging die cavity (31), and an oblique shoulder (33) is formed between the two. The main body of the second forging die (40) has a hollow cylindrical configuration. The front end of the second forging die (40) is provided with an inclined surface (41) corresponding to the inclination of the oblique shoulder portion (33). 42) and the through hole (43), the diagonal portion (42) is the part where the flange of the nut blank is formed into diagonal convex teeth, the diagonal portion (42) is composed of a plurality of diagonal convex teeth (421) , And the oblique convex tooth (421) is inclined between 35 and 45 degrees; the outer wall diameter of the second forging die (40) does not correspond to the inner wall of the forging die cavity (31). In this embodiment, the diameter It is explained that the outer wall of the second forging die (40) and the inner wall of the forging die cavity (31) do not correspond to each other and do not contact each other. In addition, the second forging die The overall height of (40) is less than the depth of the forging die cavity (31) and greater than 99.5% of the depth of the forging die cavity (31), so that the second forging die (40) and the forging die cavity (31) form low friction Combination of forces.

Please refer to Figure 4 again, which is a schematic diagram of the forging action of the preferred embodiment of the present creation. The forging process of the nut processing machine is mainly divided into two stages. The first is the die stage in which the front punch and the back punch simultaneously squeeze the nut blank, and then the back filling head pushes the nut blank out of the forming cavity. Die stage; in this figure is a schematic diagram showing the use of this creative die to extrude the nut blank (50) in the die stage, where the nut blank (50) has been fed before the punch moves The mechanism is placed in the nut die cavity (32), the nut blank (50) is squeezed by the front punch (60a) and the rear punch (60b), so that the flange (12) is placed on the second forging die The diagonal convex teeth (52) are formed by compression molding at (40).

Finally, please refer to Fig. 5, which is a schematic diagram showing how the preferred embodiment of this creation can successfully complete the ejection action. The figure shows that the nut blank (50) is pushed out of the nut mold cavity (32) by the back punch (60b). In the process, the second forging is performed when the nut blank (50) is not rotating. Due to the low friction contact between the die (40) and the forging die cavity (31), the second forging die (40) as a whole can easily rotate with the inclination of the inclined convex teeth of the diagonal portion (42), and finally make the screw The flange (12) of the cap blank (50) is smoothly released from the second forging die (40), so as to directly form the diagonal convex teeth of the riveted nut on the nut processing machine, and avoid damage to the embryo. The main purpose of the diagonal convex teeth (52) of the material and the diagonal part of the mold.

After the description of the above embodiments, it can be easily understood that this creation has at least the following advantages: 1. The twill molding die structure of the riveting nut of this creation breaks through the inability of the conventional nut processing machine to successfully complete the twill convex tooth processing Missing. 2. In the application of this creation, the second processing of the knurling process of the conventional twill riveting nut is omitted, which actually shortens the processing procedure and time, and greatly increases the production volume of the twill riveting nut.

To sum up, the structure of the twill molding die for the riveting nut of this creation has indeed achieved the preset purpose, and it has actually met the needs of the industry. A patent application was filed in accordance with the law, but this creation has been based on the aforementioned preferred embodiment Disclosure, however, the size, shape, or quantity shown in the drawings are not used to limit the creation. Anyone familiar with this technique may retouch or modify it without departing from the spirit and scope of this creation. Therefore, this creation The scope of protection shall be subject to the scope of the attached patent application.

10: Riveted nut 11: Nut body 12: flange 13: screw hole 14: diagonal convex teeth 20: Forging die seat 21: Mould cavity 22: Threaded part 23: limit piece 30: The first forging die 31: Forging die cavity 32: Nut mold cavity 33: oblique shoulder 40: 2nd forging die 41: Reach the slope 42: Twill part 421: Oblique convex tooth 43: pilot hole 50: Nut blank 51: flange 52: diagonal convex teeth 60a: Front punch 60b: rear punch

Figure 1 is a three-dimensional schematic diagram of a conventional diagonal riveted nut. Figure 2 is an exploded schematic diagram of the structure of the preferred embodiment of the authoring. Figure 3 is a schematic cross-sectional view of the structure of the preferred embodiment of this creation. Figure 4 is a schematic diagram of extruding the nut blank with flanges out of the diagonal part. Fig. 5 is a schematic diagram of the operation of the second forging die when the nut with the diagonal pattern exits the cavity.

20: Forging die seat

21: Mould cavity

22: Threaded part

23: limit piece

30: The first forging die

31: Forging die cavity

32: Nut mold cavity

33: oblique shoulder

40: 2nd forging die

41: Reach the slope

42: Twill part

421: Oblique convex tooth

43: pilot hole

Claims (5)

A twill molding die structure for riveting nuts, the main feature is that it includes: A forging die holder, the forging die holder is made with a die cavity, and the die cavity is provided with a threaded portion; A first forging die, the first forging die forging a nut die cavity and a forging die cavity, the nut die cavity penetrates the forging die cavity, and an oblique shoulder is formed between the two; A second forging die, the main body of the second forging die is a hollow cylindrical configuration, the front end of the second forging die is provided with an inclined surface, the inner surface is made with a diagonal portion and a through hole, and the diagonal portion is formed by a plurality of inclined convex teeth constitute; The second forging die is placed in the forging die cavity and the first forging die is placed in the cavity. A stopper is screwed on the threaded part of the forging die seat to cooperate with the first forging die and the second forging die. It is confined in the cavity, and makes the second forging die and the forging die cavity form low friction contact. The diagonal pattern forming mold structure of the riveting nut as described in claim 1, wherein the inclined surface corresponds to the inclination of the inclined shoulder. According to claim 1, the structure of the diagonal pattern forming die for a riveting nut, wherein the outer wall of the second forging die is not in contact with the inner wall of the forging die cavity. According to claim 1, the twill forming die structure for riveting nuts, wherein the overall height of the second forging die is greater than 99.5% and less than the depth of the forging die cavity. The diagonal pattern forming mold structure of the riveting nut according to claim 1, wherein the inclined angle of the diagonal convex tooth is between 35° and 45°.

Images