Hot melting fastening screw forming die

Abstract

The utility model discloses a hot melting fastening screw forming die which comprises a die body, and a screw middle forming structure and a screw tail forming structure are arranged on the upper surface of the die body. The screw middle forming structure is used for thread forming of the screw; the screw tail forming structure comprises a tail front end forming part, a tail middle forming part and a tail tail end forming part, the tail front end forming part is used for forming a front end conical surface of a screw tail close to a thread position, and the tail middle forming part is used for forming a middle conical surface of the screw. The tail end forming part is used for forming a conical tip at the tail end of the screw; by arranging the screw middle forming structure and the screw tail forming structure on the die body, one-time forming of the hot melting fastening screw can be achieved, and production efficiency is obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of screw forming dies, in particular to a hot-melt fastening screw forming die. Background Art

[0002] Screws are common fasteners in industrial production and daily life. There are many types of screws and they are widely used.

[0003] Hot melt fastening screws are based on hot melt fastening technology. It is a cold forming process that transmits the high-speed rotation of the motor to the sheet metal to be connected through the tightening shaft in the center of the equipment, generating frictional heat and plastic deformation, and then self-tapping and screwing.

[0004] At the beginning of the tightening process, a hot-melt screw is placed on the surface of an aluminum plate or thin steel plate without pre-drilled holes. The high-speed rotating screw applies high downward pressure to the workpiece surface, while generating extremely high friction heat, melting the metal; then, the top of the screw penetrates the material, forming a perforation, and gradually begins to tap the thread. Once the thread is formed, the screw is tightened according to the preset torque.

[0005] At present, the production and processing technology of hot-melt fastening screws is relatively complicated, and the threaded section and the screw tail need to be processed separately, which leads to the problem of low production efficiency of hot-melt fastening screws. For this reason, the utility model proposes a hot-melt fastening screw forming mold to achieve one-time forming of the hot-melt fastening screws. Utility Model Content

[0006] In order to solve the problems existing in the prior art, the utility model provides a hot-melt fastening screw forming die with simple processing and high production efficiency.

[0007] The technical solution of the utility model is as follows:

[0008] A hot melt fastening screw forming mold includes a mold body, and the upper surface of the mold body is provided with a screw middle forming structure and a screw tail forming structure; the screw middle forming structure is used for screw thread forming; the screw tail forming structure includes a tail front end forming part, a tail middle forming part and a tail end forming part, the tail front end forming part is used for forming the front end conical surface of the screw tail close to the thread position, the tail middle forming part is used for forming the middle conical surface of the screw, and the tail end forming part is used for forming the screw end cone tip.

[0009] Furthermore, the screw middle forming structure includes deep teeth and shallow teeth, and the shallow teeth are arranged close to the screw tail forming structure.

[0010] Furthermore, the number of shallow teeth is 1-2, and the bottom surfaces on both sides of the shallow teeth are tilted to form a slope, and the highest point of the slope is close to the screw tail molding structure. Preferably, the number of shallow teeth is 1.

[0011] Furthermore, the cross-sections of the deep teeth and shallow teeth are both triangular, and the tops are arc transitions; the deep teeth are connected by arcs.

[0012] Furthermore, the front end forming part of the tail adopts an arc surface A, the middle forming part of the tail adopts an arc surface B, and the end forming part of the tail includes an arc surface C and a forming protrusion. The arc surface A, arc surface B, arc surface C and forming protrusion are connected and arranged in sequence.

[0013] Furthermore, a tail structure is provided on the upper surface of the mold body on one side of the screw middle forming structure. The tail structure adopts an inclined surface structure, and the high point of the inclined surface structure is close to the screw middle forming structure.

[0014] The beneficial effects of the utility model are as follows:

[0015] 1) The utility model can realize one-step forming of hot-melt fastening screws by arranging the screw middle forming structure and the screw tail forming structure on the mold body, thereby significantly improving production efficiency.

[0016] 2) The utility model provides shallow teeth on the middle forming structure of the screw, and the two sides of the shallow teeth adopt inclined structures, which facilitates the screw tail forming structure to be introduced into the sheet material to be connected.

[0017] 3) The screw tail forming structure adopts a three-stage structure to accurately realize the processing of the screw tail structure and ensure the tail forming of the hot melt fastening screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the upper surface of the mold body of the present utility model;

[0019] Figure 2 This is a schematic diagram of the side structure of the mold body of the present utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the screws processed and formed in the utility model;

[0021] In the figure: 1. Mold body; 2. Screw middle forming structure; 201. Deep thread; 202. Shallow thread; 203. Bevel; 204. Arc; 3. Screw tail forming structure; 301. Tail front end forming part; 302. Tail middle forming part; 303. Tail end forming part; 304. Arc surface C; 305. Forming protrusion; 4. Finishing structure. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] like Figure 1-2As shown, a hot melt fastening screw forming mold includes a mold body 1, a screw middle forming structure 2, and a screw tail forming structure 3;

[0024] The screw middle forming structure 2 is used for forming the screw thread, and the screw tail forming structure 3 is used for forming the tail cone section of the screw.

[0025] The screw middle forming structure 2 includes deep teeth 201 and shallow teeth 202. In this embodiment, the shallow teeth 202 are arranged 1, and the shallow teeth 202 are arranged close to the screw tail forming structure 3.

[0026] The bottom surfaces on both sides of the shallow teeth 202 are tilted to form a slope 203, and the high point of the slope is close to the screw tail forming structure 3, and the low point of the slope is away from the screw tail forming structure 3; the purpose of setting the slope 203 is to have a slight taper on the thread in the initial stage of screw introduction, which is convenient for introduction.

[0027] The cross-sections of the deep teeth 201 and the shallow teeth 202 are both triangular, and the tops are arc transitions; the deep teeth 201 are connected to each other by arcs 204; the deep teeth 201 are conventional structures and will not be described here.

[0028] The front end forming part 301 of the tail adopts arc surface A, the middle forming part 302 of the tail adopts arc surface B, and the end forming part of the tail includes arc surface C304 and forming protrusion 305; arc surface A, arc surface B, arc surface C and forming protrusion are connected and arranged in sequence.

[0029] The radii of the arc surface A, the arc surface B, and the arc surface C gradually decrease, and the arc surface A, the arc surface B, and the arc surface C form three conical surfaces at the tail of the screw, which are used to generate heat by friction with the sheets to be connected during high-speed rotation.

[0030] In another embodiment, a tail structure 4 is further provided on the upper surface of the mold body 1 on one side of the screw middle forming structure 2 . The tail structure 4 is an inclined surface, and the highest point of the inclined surface is close to the screw middle forming structure 2 .

[0031] Since screw processing is a process of reducing material, the setting of the finishing structure 4 facilitates the discharge of materials during the processing.

[0032] Working process:

[0033] The screw die is placed between the fixed plate and the movable plate of the thread rolling die, and the fixed plate and the movable plate are set correspondingly. The mold described in the utility model is the fixed plate; the screw moves from one end to the other end of the thread rolling die, and the screw pattern is formed by the middle forming structure of the screw during the movement, and the multi-section conical structure of the tail of the screw is formed by the forming structure of the tail of the screw, thereby realizing one-time processing and forming, which greatly improves production efficiency and enterprise benefits.

Claims

1. A hot melt fastening screw forming mold, comprising a mold body (1), characterized in that: The upper surface of the mold body (1) is provided with a screw middle forming structure (2) and a screw tail forming structure (3); the screw middle forming structure (2) is used for screw thread forming; the screw tail forming structure (3) comprises a tail front end forming portion (301), a tail middle forming portion (302) and a tail end forming portion (303); the tail front end forming portion (301) is used for forming the front end conical surface of the screw tail close to the thread position, the tail middle forming portion (302) is used for forming the middle conical surface of the screw, and the tail end forming portion (303) is used for forming the screw end conical tip.

2. A hot melt fastening screw forming mold according to claim 1, characterized in that: The screw middle forming structure (2) comprises deep teeth (201) and shallow teeth (202), and the shallow teeth (202) are arranged close to the screw tail forming structure (3).

3. A hot melt fastening screw forming die according to claim 2, characterized in that: The shallow teeth (202) are provided with 1-2 pieces, and the bottom surfaces on both sides of the shallow teeth (202) are inclined to form inclined surfaces (203), and the highest point of the inclined surfaces is close to the screw tail forming structure (3).

4. The hot melt fastening screw forming mold according to claim 2, characterized in that: The cross-sections of the deep teeth (201) and the shallow teeth (202) are both triangular, and the tops are arc transitions; the deep teeth (201) and the deep teeth (201) are connected by arcs (204).

5. The hot melt fastening screw forming mold according to claim 1, characterized in that: The tail front end forming portion (301) adopts an arc surface A, the tail middle forming portion (302) adopts an arc surface B, and the tail end forming portion (303) includes an arc surface C (304) and a forming protrusion (305), wherein the arc surface A, the arc surface B, the arc surface C and the forming protrusion are sequentially connected and arranged.

6. The hot melt fastening screw forming mold according to claim 1, characterized in that: The upper surface of the mold body (1) is provided with a tail structure (4) on one side of the screw middle forming structure (2); the tail structure (4) adopts an inclined surface structure, and the high point of the inclined surface structure is close to the screw middle forming structure (2).

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