A self-tapping screw designed to prevent loosening and its cold heading equipment.

Abstract

This invention discloses an anti-loosening self-tapping screw and its cold heading equipment, comprising a screw body, which includes a torsion part and a self-tapping part. The self-tapping part is fixed to the lower side of the torsion part. The side of the self-tapping part has threaded grooves and openings. The threaded grooves are arranged in an alternating pattern on the outer side of the self-tapping part, and the openings are arranged at equal intervals along the long axis of the self-tapping part on the outer side of the self-tapping part, and the openings are staggered from the threaded grooves. After the screw body is installed, it can be hammered with a hammer or other striking device to make the screw body sink into the material. When the screw body is hammered and moves downward as a whole, it will squeeze the threaded grooves, causing all the openings to move downward and deform, thereby improving the anti-loosening performance of the screw body. When the screw body is pulled out by external force, the downwardly deformed threaded grooves are in the opposite direction to the direction in which the screw body is pulled out, thus generating a greater frictional force than that of self-tapping screws in the prior art when pulled out.

Description

Technical Field

[0001] This invention relates to the field of self-tapping screws, specifically a self-tapping screw designed to prevent loosening and its cold heading equipment. Background Technology

[0002] Existing self-tapping screws are all machined in one go by turning. However, the structure of self-tapping screws that are machined in a single go is too simple. Because of this simple structure, the anti-loosening performance is too poor. If the anti-loosening performance is improved by adding a structure to the surface of the self-tapping screw, the self-tapping screw must be moved to other processing equipment for processing. It cannot be machined by a single device or instrument, which is too inefficient. Therefore, there is a need for a device that can machine self-tapping screws with complex surface structures individually to increase the efficiency of self-tapping screw processing. Summary of the Invention

[0003] The present invention provides a self-tapping screw that prevents loosening and a cold heading device thereof, which overcomes the shortcomings described in the background art.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A self-tapping screw designed to prevent loosening includes a screw body. The screw body includes a torsion portion and a self-tapping portion. The self-tapping portion is fixed to the lower side of the torsion portion. The side of the self-tapping portion has threaded grooves and openings. The threaded grooves are arranged in an alternating pattern on the outer side of the self-tapping portion. The openings are arranged at equal intervals along the long axis of the self-tapping portion on the outer side of the self-tapping portion, and the openings are staggered from the threaded grooves. The threaded grooves extend from the upper part of the self-tapping portion to the lower part of the self-tapping portion. The lower part of the self-tapping portion has a tapered structure that is larger at the top and smaller at the bottom.

[0006] A preferred technical solution: The threaded groove includes a first threaded groove and a second threaded groove, the first threaded groove and the second threaded groove are symmetrically arranged, and the threads of the first threaded groove and the threads of the second threaded groove are interleaved.

[0007] A preferred technical solution: all openings located on the outside of the self-tapping part are arranged in the same axial direction.

[0008] A preferred technical solution: the torsion part has an inwardly recessed groove, and the screw body is made of a strongly magnetic material that can be attracted by a magnet.

[0009] A cold heading device for manufacturing the self-tapping screw includes a frame, a linear guide frame, a first lead screw drive unit, a second lead screw drive unit, a cold heading forming die, an open forming die, a material positioning hollow tube, and a cutting blade. The first and second lead screw drive units are both mounted on the linear guide frame. The cold heading forming die and the open forming die are both mounted on the frame. The material positioning hollow tube is installed below the open forming die, and the cutting blade is positioned near a retaining rod. Both the cutting blade and the retaining rod are located on the inner side of the frame. A first cylinder is provided at the lower end of the lead screw transmission part, and an extrusion part is installed on the output shaft of the first cylinder. The cold heading forming mold has a forming groove, and the upper end of the forming groove has an inwardly recessed step edge. The outer diameter of the extrusion part is adapted to the inner diameter of the step edge. A second cylinder is provided at the lower end of the second lead screw transmission part, and a driving rotating component is provided on the output shaft of the second cylinder. A magnetic extrusion part is provided on the output shaft of the driving rotating component. The magnetic extrusion part, the open forming mold, and the material positioning hollow tube are coaxially arranged.

[0010] A preferred technical solution: The cold heading forming mold and the cutting blade are symmetrically arranged on both sides of the opening forming mold, the clamping rod is located on the side of the cutting blade, the cutting blade is fixed to the inner side of the frame by a third cylinder, and the frame has an opening for discharging the screw body, the opening being located below the cutting blade and the clamping rod.

[0011] A preferred technical solution: The opening forming mold includes two mold plates, each mold plate is fixed in the frame body by a driving component, and a hole for placing the screw body is formed between the two mold plates. The hole and the material positioning hollow tube are coaxially arranged, and each mold plate is provided with a forming protrusion for forming the opening. The two mold plates face each other.

[0012] A preferred technical solution: The lower end of the magnetic extrusion part has a protrusion for forming a card slot.

[0013] Compared with the prior art, this technical solution has the following advantages:

[0014] After the screw body is installed, it can be hammered with a hammer or other striking device to make it sink into the material. When the screw body is knocked down as a whole, it will squeeze the thread groove, causing all the openings to deform downwards, thus improving the screw body's anti-loosening performance. When the screw body is pulled out by external force, the downwardly deformed thread groove is in the opposite direction to the direction in which the screw body is pulled out. Therefore, when pulled out, it can generate a greater frictional force than self-tapping screws in the prior art. Furthermore, the cold heading equipment mentioned in this invention can improve the efficiency of screw body production. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of Embodiment 1.

[0017] Figure 2 This is a schematic diagram of Example 2.

[0018] Figure 3 This is a partial structural diagram of Example 2.

[0019] Figure 4 This is a schematic diagram of the cold heading die 4.

[0020] In the diagram: screw body a, torsion part a1, slot a11, self-tapping part a2, threaded groove a21, opening a22, linear guide frame 1, first lead screw drive part 2, first cylinder 21, extrusion part 22, second lead screw drive part 3, second cylinder 31, drive rotating part 32, magnetic extrusion part 321, cold heading forming mold 4, forming groove 41, opening forming mold 5, forming protrusion 51, material positioning hollow tube 6, cutting blade 7, third cylinder 71, locking rod 8. Detailed Implementation

[0021] Example 1

[0022] like Figure 1As shown, this embodiment provides a self-tapping screw to prevent loosening, including a screw body a. The screw body a includes a torsion portion a1 and a self-tapping portion a2. The self-tapping portion a2 is fixed to the lower side of the torsion portion a1. The side of the self-tapping portion a2 has threaded grooves a21 and openings a22. The threaded grooves a21 are staggered on the outer side of the self-tapping portion a2. The openings a22 are arranged at equal intervals along the long axis of the self-tapping portion a2 on the outer side of the self-tapping portion a2, and the openings a22 are staggered. A threaded groove a21 is provided; the threaded groove a21 extends from the upper part of the self-tapping part a2 to the lower part of the self-tapping part a2. The lower part of the self-tapping part a2 has a tapered structure that is larger at the top and smaller at the bottom. The torsion part a1 has an inwardly recessed groove a11. In this embodiment, when using the self-tapping screw, its lower part can be driven into the material or fixed end first. The user takes a screwdriver and inserts the screwdriver tip into the groove a11. Rotating the screwdriver will allow the self-tapping screw in this embodiment to be inserted as it rotates. To address the problem mentioned in the background art that "self-tapping screws formed by a single machining process have an overly simple structure, resulting in poor anti-loosening performance," an opening a22 is provided on the side of the self-tapping part a2. When the screw body a in this embodiment is locked into the material by rotation, the opening a22 does not embed itself into the material. After the screw body a is installed, it can be hammered with a hammer or other striking device to sink it into the material. Since the thread groove a21 abuts against the inner end face of the material after the screw body a is embedded, when the screw body a is knocked down, it squeezes the thread groove a21, causing all openings a22 to deform downwards, improving the anti-loosening performance of the screw body a. When the screw body a is pulled out by external force, the downwardly deformed thread groove a21 is in the opposite direction to the direction the screw body a is pulled out, thus generating greater friction than in existing self-tapping screws.

[0023] Furthermore, the threaded groove a21 includes a first threaded groove and a second threaded groove. The first threaded groove and the second threaded groove are symmetrically arranged, and the threads of the first threaded groove and the threads of the second threaded groove are interlaced. The purpose of this arrangement is to allow the user to embed the screw body a into the material regardless of whether it is rotated in the forward or reverse direction. It should be explained that after the screw body a is embedded in the material, it can only be embedded in the material by rotating in one direction. Since the other threaded groove is not embedded in the inner surface of the material, when it is struck, the other threaded groove can also deform, increasing the friction between the screw body a and the material.

[0024] Furthermore, all openings a22 located outside the self-tapping part a2 are arranged along the same axis.

[0025] In order to make the screw body a attract to the screwdriver tip when it is near a magnetic screwdriver, the screw body a is made of a strongly magnetic material that can be attracted by a magnet, such as iron, cobalt, nickel, alloy, steel, etc.

[0026] Example 2

[0027] This embodiment provides a cold heading device for manufacturing the self-tapping screw, including a frame, a linear guide frame 1, a first lead screw drive unit 2, a second lead screw drive unit 3, a cold heading forming mold 4, an open forming mold 5, a material positioning hollow tube 6, and a cutting blade 7. The first lead screw drive unit 2 and the second lead screw drive unit 3 are both mounted on the linear guide frame 1. The cold heading forming mold 4 and the open forming mold 5 are both mounted on the frame. The material positioning hollow tube 6 is installed below the open forming mold 5, and the cutting blade 7 is located near a retaining rod 8. Both the cutting blade 7 and the retaining rod 8 are located on the inner side of the frame. The first lead screw... The lower end of the transmission part 2 is provided with a first cylinder 21, and an extrusion part 22 is installed on the output shaft of the first cylinder 21. The cold heading forming mold 4 has a forming groove 41, and the upper end of the forming groove 41 has an inwardly recessed step edge. The outer diameter of the extrusion part 22 is adapted to the inner diameter of the step edge. The lower end of the second lead screw transmission part 3 is provided with a second cylinder 31, and a driving rotating part 32 is provided on the output shaft of the second cylinder 31. A magnetic extrusion part 321 is provided on the output shaft of the driving rotating part 32. The magnetic extrusion part 321, the open forming mold 5, and the material positioning hollow tube 6 are coaxially arranged.

[0028] When manufacturing the screw body a using this embodiment, the tubular material can first be placed in the forming groove 41 within the cold heading mold 4. The first lead screw drive 2 is then moved to a position directly above the cold heading mold 4. The first cylinder 21 presses down on the material by pressing the extrusion part 22 against it, extruding the material into the contour shape within the forming groove 41. Subsequently, the second lead screw drive 3 moves the material above the cold heading mold 4. The lower end of the magnetic extrusion part 321 has a protrusion for forming the slot a11. The material can be pressed downwards by the magnetic extrusion part 321 at the lower end of the second lead screw drive 3, forming the slot a on the upper surface of the material. 11. Since the magnetic extrusion part 321 contains a magnet, it will attract the material when it is close to it. Therefore, after forming the slot a11, the second cylinder 31 controls the magnetic extrusion part 321 to lift the material upward and move it to the top of the material positioning hollow tube 6. Then, the lower end of the material is embedded into the material positioning hollow tube 6. Then, the driving members on both sides gather the opening forming mold 5 in the middle and clamp the material. Since the opening forming mold 5 includes two mold plates, each mold plate is fixed in the frame by a driving member. A hole for placing the screw body a is formed between the two mold plates. The hole and the material The material positioning hollow tube 6 is coaxially arranged, and each mold plate is provided with a forming protrusion 51 for forming the opening a22. The two mold plates face each other. When the two mold plates simultaneously extrude the material, the opening a22 is formed on the side of the material. Then, the material is attracted by the magnetic extrusion part 321 and the protrusion is engaged. The material is moved to the cutting blade 7 by the second lead screw transmission part 3. The magnetic extrusion part 321 and the material are rotated by the drive rotating part 32, and the cutting work is formed at the cutting blade 7, thereby forming the thread groove a21 on the surface of the material. After the thread groove a21 is formed, the finished screw is obtained. Body a is then moved to the bottom of clamp rod 8 via the second lead screw drive 3. Since the end of clamp rod 8 is semi-circular and its inner diameter is the same as the outer diameter of torsion part a1, and the outer diameter of magnetic squeezing part 321 is smaller than the outer diameter of torsion part a1, when the material is moved to the bottom of clamp rod 8 via the second lead screw drive 3, the edge of the end of clamp rod 8 abuts against torsion part a1. Then, the output shaft of the second cylinder 31 is controlled to retract, so that screw body a abuts against the end of clamp rod 8, allowing magnetic squeezing part 321 to disengage from the material adsorption state of screw body a, thereby expelling the finished screw body a from the equipment.

[0029] Furthermore, the cold heading mold 4 and the cutting blade 7 are symmetrically arranged on both sides of the opening forming mold 5. The clamping rod 8 is located on the side of the cutting blade 7. The cutting blade 7 is fixed to the inside of the frame by a third cylinder 71. The frame has an opening for discharging the screw body a. The opening is located below the cutting blade 7 and the clamping rod 8. The purpose of this arrangement is to reduce the number of steps and time required to produce the screw body a and improve efficiency. After the screw body a is formed by the extrusion part 22, the material is moved to the material positioning hollow tube 6 by the second lead screw transmission part 3. Only a lateral movement is required. After the opening a22 is formed by the opening forming mold 5, only a small distance needs to be moved to form the thread groove a21 by the cutting blade 7. If the efficiency of the process is to be further increased, the instruction to move the material to the clamping rod 8 can be omitted in the program. Instead, the finished screw body a can be manually removed from the magnetic extrusion part 321 by the operator.

[0030] The equipment mentioned in this embodiment can effectively solve the problem mentioned in the background art, such as "self-tapping screws still need to be moved to other processing equipment for processing, and cannot be processed and shaped by a single device or instrument, resulting in poor efficiency," compared to the cold heading equipment in the prior art.

[0031] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A cold heading device for manufacturing anti-loosening self-tapping screws, characterized in that: The invention includes a cold heading equipment body for manufacturing a screw body (a), the screw body (a) including a torsion part (a1) and a self-tapping part (a2), the self-tapping part (a2) being fixed to the underside of the torsion part (a1), the side of the self-tapping part (a2) having a threaded groove (a21) and an opening (a22), the threaded groove (a21) being arranged in an alternating manner on the outside of the self-tapping part (a2), the opening (a22) being equidistantly arranged on the outside of the self-tapping part (a2) along the long axis of the self-tapping part (a2), and the opening (a22) being offset from the threaded groove (a21); The threaded groove (a21) extends from the upper part of the self-tapping part (a2) to the lower part of the self-tapping part (a2), and the lower part of the self-tapping part (a2) has a tapered structure that is larger at the top and smaller at the bottom. The threaded groove (a21) includes a first threaded groove and a second threaded groove. The first threaded groove and the second threaded groove are symmetrically arranged, and the threads of the first threaded groove and the threads of the second threaded groove are interleaved. All openings (a22) located outside the self-tapping part (a2) are arranged along the same axis; The cold heading equipment body includes a frame, a linear guide frame (1), a first lead screw drive unit (2), a second lead screw drive unit (3), a cold heading forming mold (4), an open forming mold (5), a material positioning hollow tube (6), and a cutting blade (7). The first lead screw drive unit (2) and the second lead screw drive unit (3) are both mounted on the linear guide frame (1). The cold heading forming mold (4) and the open forming mold (5) are both mounted on the frame. The material positioning hollow tube (6) is mounted below the open forming mold (5). The cutting blade (7) is located near the clamping rod (8), and both the cutting blade (7) and the clamping rod (8) are located on the inner side of the frame. The first screw drive part (2) is provided with a first cylinder (21) at the lower end. An extrusion part (22) is installed on the output shaft of the first cylinder (21). The cold heading mold (4) has a forming groove (41). The upper end of the forming groove (41) has an inwardly recessed step edge. The outer diameter of the extrusion part (22) is adapted to the inner diameter of the step edge. The second lead screw transmission part (3) is provided with a second cylinder (31) at the lower end. A drive rotating part (32) is provided on the output shaft of the second cylinder (31), and a magnetic extrusion part (321) is provided on the output shaft of the drive rotating part (32). The magnetic extrusion part (321), the open forming mold (5), and the material positioning hollow tube (6) are coaxially arranged. The cold heading mold (4) and the cutting blade (7) are symmetrically arranged on both sides of the opening forming mold (5). The clamping rod (8) is located on the side of the cutting blade (7). The cutting blade (7) is fixed to the inside of the frame by a third cylinder (71). The frame has an opening for discharging the screw body (a). The opening is located below the cutting blade (7) and the clamping rod (8). The opening forming mold (5) includes two mold plates, each of which is fixed in the frame body by a driving component; A hole for placing the screw body (a) is formed between the two mold plates. The hole is coaxial with the material positioning hollow tube (6). Each mold plate is provided with a forming protrusion (51) for forming an opening (a22). The two mold plates face each other.

2. The cold heading equipment for manufacturing anti-loosening self-tapping screws according to claim 1, characterized in that: The lower end of the magnetic extrusion part (321) has a protrusion for forming a card slot (a11).

3. The cold heading equipment for manufacturing anti-loosening self-tapping screws according to claim 2, characterized in that: The torsion part (a1) has an inwardly recessed groove (a11), and the screw body (a) is made of a strongly magnetic material that can be attracted by a magnet.

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