Cold heading device for nut and matched assembly thereof

Abstract

This invention discloses a cold heading device for nuts, comprising a cold heading mold, wherein a plurality of conical pushing shells are arranged circumferentially on the top of the cold heading mold, and an arc-shaped block is integrally welded to the top of the conical pushing shell. The arc-shaped block moves up and down under the control of an upper pressure source. A cylindrical rod is installed on one side of each arc-shaped block. A conical shell is fixedly installed on the top of the cold heading mold, and the inner wall of the conical shell contacts the cylindrical rod. A torque conversion shell is fixedly installed on the top of the conical shell, and a pressing block is slidably installed on the inner wall of the torque conversion shell. One end of the pressing block extends out of the inner wall of the torque conversion shell and contacts the cylindrical rod. A one-way ratchet is rotatably installed on the middle inner wall of the torque conversion shell, and contact rods are rotatably installed on both sides of the one-way ratchet. A pawl is rotatably provided on one side of the contact rod. This device solves the problem of poor practicality in current applications.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, specifically relating to a cold heading device for nuts and its supporting components. Background Technology

[0002] Cold heading is a cold working method that extrudes and shapes a workpiece, commonly used in the production of screws and nuts. During the cold heading process, a pusher repeatedly pushes the workpiece downwards, deforming it and gradually forcing it into the bottom of the cold heading die. Current technology generally uses a split, arc-shaped shell to achieve this, with the arc-shaped shell being a frustum-shaped structure that is smaller at the bottom and larger at the top. Occasionally, insufficient surface friction can cause slippage, and under pressure, this can lead to bending of the workpiece, resulting in defective products.

[0003] The existing solution is to grind the sidewalls of the workpiece; however, this adds an extra step to deal with the occasional occurrence, increasing equipment costs and reducing practicality. This phenomenon has become a problem that urgently needs to be solved by those in the field. Summary of the Invention

[0004] The purpose of this invention is to provide a cold heading device for nuts and its supporting components for existing material gathering devices, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a cold heading device for nuts, comprising a cold heading mold, wherein a plurality of conical extrusion shells are arranged circumferentially on the top of the cold heading mold, and an arc-shaped block is integrally welded to the top of the conical extrusion shell. The arc-shaped block moves up and down under the control of an upper pressure source. A cylindrical rod is installed on one side of each arc-shaped block. A conical shell is fixedly installed on the top of the cold heading mold, and the inner wall of the conical shell is in contact with the cylindrical rod.

[0006] A component of a cold heading device for nuts includes a torque conversion shell fixedly mounted above a conical shell. A pressing block is slidably mounted on the inner wall of the torque conversion shell, with one end of the pressing block extending beyond the inner wall of the torque conversion shell and contacting a cylindrical rod. A one-way ratchet is rotatably mounted on the middle inner wall of the torque conversion shell. Contact rods are rotatably mounted on both sides of the one-way ratchet. A pawl is rotatably mounted on one side of each contact rod, and the pawl and the one-way ratchet are in a mating structure. A retaining spring is mounted on the contact rod, and the retaining spring and the pawl are in mutual abutment contact. A rotating shaft is mounted on one side of the one-way ratchet, and a friction block is provided on the outer wall of the rotating shaft.

[0007] The present invention further illustrates that a compression spring is clamped and fixed between the two extrusion blocks, the one-way ratchet has a through hole in the middle, and a torsion spring is connected between the two contact rods, the torsion spring being located inside the through hole.

[0008] The present invention further illustrates that a circular hole is provided at the overlapping part of the two contact rods, and the rotating shaft is slidably inserted into the circular hole. The side wall of the rotating shaft is fixed to one side of the one-way ratchet by welding, and the rotation center line of the rotating shaft coincides with that of the one-way ratchet.

[0009] The present invention further illustrates that a hollow bracket is movably mounted on the outer wall of the rotating shaft via a bearing, a friction block is slidably mounted on the side wall of the hollow bracket, a push rod is hinged to one side of the friction block, and one end of the push rod is hinged to the outer wall of the rotating shaft.

[0010] The present invention further illustrates that the friction blocks are arranged in pairs, and the two friction blocks that are paired together slide in contact.

[0011] The present invention further illustrates that a hollow support rod is connected through the bottom of the conical shell, and the hollow support rod is fixedly connected to the cold heading mold by welding. One side of the conical shell is connected to an external pressure water source.

[0012] The present invention further illustrates that an arc-shaped permeation mesh is embedded in the inner wall of the cold heading mold, and one side of the arc-shaped permeation mesh has the same shape as the inner wall of the cold heading mold.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: As the workpiece is gradually cold-forged downwards, its outer wall is specifically polished to prevent slippage of the overly smooth workpiece surface during the process of pushing it into the cold-forging mold. Furthermore, the polishing and cold forging are carried out simultaneously without the need for an additional process. As the frequency of downward cold forging increases, it is easier to slip, and the degree of polishing is higher, making it easier to determine the degree of polishing according to the cold forging frequency. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the working of the conical extrusion shell and cold heading die of the present invention;

[0017] Figure 3 This is a schematic diagram of the internal structure of the conical shell of the present invention;

[0018] Figure 4 This is a schematic diagram of the torque conversion shell structure of the present invention;

[0019] Figure 5 This is a schematic diagram of the friction block installation of the present invention;

[0020] Figure 6 This is a schematic diagram of the internal structure of the cold heading die of the present invention;

[0021] Figure 7 This is a schematic diagram of the installation of the hollow bracket and friction block of the present invention;

[0022] In the diagram: 1. Cold heading mold; 11. Hollow support rod; 12. Conical shell; 13. Arc-shaped permeable mesh; 21. Conical extrusion shell; 22. Arc-shaped block; 221. Cylindrical rod; 3. Rotating shaft; 31. Push rod; 32. Friction block; 33. Hollow bracket; 4. Torque conversion shell; 41. Extrusion block; 42. Compression spring; 43. One-way ratchet; 44. Claw; 45. Contact rod; 46. Holding spring; 47. Torsion spring. Detailed Implementation

[0023] The following detailed, non-limiting description of the technical solution of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] Please see Figure 1-7 The present invention provides a technical solution: a cold heading device for nuts, comprising a cold heading mold 1, wherein a plurality of conical extrusion shells 21 are arranged in a circular pattern on the top of the cold heading mold 1, and an arc-shaped block 22 is integrally welded to the top of the conical extrusion shell 21. The arc-shaped block 22 is controlled to move up and down by an upper pressure source. A cylindrical rod 221 is installed on one side of each arc-shaped block 22. A conical shell 12 is fixedly installed on the top of the cold heading mold 1. The inner wall of the conical shell 12 is in contact with the cylindrical rod 221. When cold heading begins, the conical extrusion shells 21 are pressed downward by the upper pressure source. At this time, since the conical shells 12 guide the direction of the cylindrical rod 221, the gaps between the four conical extrusion shells 21 are merged and extruded from large to small to form the screw or nut blank. The cold heading mold 1 is used to determine the shape of the formed part.

[0025] A component of a cold heading device for nuts includes a torque conversion shell 4 fixedly mounted above a conical shell 12. A pressing block 41 is slidably mounted on the inner wall of the torque conversion shell 4, with one end extending out of the inner wall and contacting a cylindrical rod 221. A one-way ratchet 43 is rotatably mounted on the middle inner wall of the torque conversion shell 4. Contact rods 45 are rotatably mounted on both sides of the one-way ratchet 43. A pawl 44 is rotatably mounted on one side of the contact rod 45, and the pawl 44 and the one-way ratchet 43 are mating. A retaining spring 46 is mounted on the contact rod 45, and the retaining spring 46 and the pawl 44 abut against each other. A rotating shaft 3 is mounted on one side of the one-way ratchet 43, and a friction block 32 is provided on the outer wall of the rotating shaft 3. During each downward press, a cold heading is achieved. During the process, as the cylindrical rod 221 moves downward, it will press the extrusion block 41 towards the center. The contact rod 45 and the extrusion block 41 have a certain angle, which cannot be a right angle. This makes it easy to use the extrusion block 41 to drive the contact rod 45 to change the angle, thereby moving the hook 44. Due to the one-way meshing performance of the hook 44 and the one-way ratchet 43, when rotating in the forward direction, it will drive the one-way ratchet 43 to rotate in the forward direction. When rotating in the reverse direction, it will not cause the one-way ratchet 43 to rotate in the reverse direction. During multiple reciprocating operations, the one-way ratchet 43 can smoothly drive the friction block 32 to rotate continuously, thereby rubbing the surface of the workpiece to be processed. This prevents the slippage of the overly smooth workpiece surface during the process of pushing it into the cold heading mold. Furthermore, grinding and cold heading are carried out simultaneously, without the need for another additional process.

[0026] A compression spring 42 is clamped and fixed between the two extrusion blocks 41. The one-way ratchet 43 has a through hole in the middle, and a torsion spring 47 is connected between the two contact rods 45. The torsion spring 47 is located inside the through hole. When the distance between the two extrusion blocks 41 decreases, it will drive the contact rods 45 to change the angle around its center. When the distance between the extrusion blocks 41 increases, due to the restoring deformation force of the torsion spring, the two contact rods 45 unfold again and always fit against the extrusion blocks 41, which makes it easy to repeatedly adjust the angle.

[0027] A circular hole is provided at the overlapping part of the two contact rods 45. The rotating shaft 3 is slidably inserted into the circular hole. The side wall of the rotating shaft 3 is fixed to one side of the one-way ratchet 43 by welding. The rotation center line of the rotating shaft 3 and the one-way ratchet 43 coincides. The angle change of the contact rod 45 itself will not affect the one-way ratchet 43 and the rotating shaft 3. When the one-way ratchet 43 rotates due to the drive of the pawl 44, the rotating shaft 3 will also be driven to rotate because the rotating shaft 3 is fixed to the one-way ratchet 43 by welding, thus smoothly transmitting torque.

[0028] A hollow bracket 33 is movably mounted on the outer wall of the rotating shaft 3 via a bearing. A friction block 32 is slidably mounted on the side wall of the hollow bracket 33. A push rod 31 is hinged to one side of the friction block 32. One end of the push rod 31 is hinged to the outer wall of the rotating shaft 3. As the reciprocating pressing process occurs, the rotating shaft 3 is continuously driven to rotate, which in turn drives the push rod 31 and the hollow bracket 33 to rotate in a circle. As the rotation speed increases, the angle of the push rod 31 increases, and the friction block 32 pushes outward due to inertia. At this time, the friction block 32 slides outward on the side wall of the hollow bracket 33, and the rotation radius of the friction block 32 increases, which can make more sufficient contact with the side wall of the workpiece. As the downward pushing cold heading frequency increases, it is easier to slip and the degree of grinding is higher, which makes it easier to determine the degree of grinding according to the cold heading frequency. A slower rotation speed will result in a smaller friction radius.

[0029] The friction blocks 32 are set in pairs, and the two friction blocks 32 that are paired together slide in contact. As the rotation speed of the shaft 3 increases, the friction blocks 32 will swing outward more due to inertia. During the outward swinging process, the two friction blocks 32 gradually separate to form a larger friction surface, which makes it easier to contact the nut to be processed.

[0030] A hollow support rod 11 is connected through the bottom of the conical shell 12, and the hollow support rod 11 is fixedly connected to the cold heading mold 1 by welding. One side of the conical shell 12 is connected to an external pressure water source. As the extrusion block 41 extrudes towards the center, each extrusion will increase the pressure inside the conical shell 12, forcing the coolant into the hollow support rod 11 and into the cold heading mold 1 to prevent the cold heading mold from overheating. The coolant flow rate is equal to the cold heading frequency, so it will not cause overcooling or insufficient cooling.

[0031] An arc-shaped permeation mesh 13 is embedded in the inner wall of the cold heading mold 1. One side of the arc-shaped permeation mesh 13 has the same shape as the inner wall of the cold heading mold 1. When the coolant enters the inner wall of the cold heading mold 1, it will permeate from the arc-shaped permeation mesh 13 to the middle. This allows for wall-mounted cooling when the nut is formed in the cold heading mold 1, preventing the workpiece from overheating.

[0032] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cold heading device for nuts, comprising a cold heading die (1) and supporting components, characterized in that: The top of the cold heading mold (1) is provided with several conical extrusion shells (21) arranged in a circular pattern. The top of each conical extrusion shell (21) is integrally welded with an arc-shaped block (22). The arc-shaped block (22) is controlled to move up and down by an upper pressure source. A cylindrical rod (221) is installed on one side of each arc-shaped block (22). A conical shell (12) is fixedly installed on the top of the cold heading mold (1). The inner wall of the conical shell (12) is in contact with the cylindrical rod (221). The supporting components include a torque conversion shell (4) fixedly installed above the conical shell (12) of the cold heading mold. An extrusion block (41) is slidably installed on the inner wall of the torque conversion shell (4). One end of the torque conversion shell (4) extends out of the inner wall of the torque conversion shell (4). The extrusion block (41) is in contact with the cylindrical rod (221). A one-way ratchet (43) is rotatably installed on the inner wall of the middle part of the torque conversion shell (4). Contact rods (45) are rotatably installed on both sides of the one-way ratchet (43). A pawl (44) is rotatably provided on one side of the contact rod (45). The pawl (44) and the one-way ratchet (43) are in a cooperating structure. A retaining spring (46) is provided on the contact rod (45). The retaining spring (46) and the pawl (44) are in mutual contact. A rotating shaft (3) is installed on one side of the one-way ratchet (43). A friction block (32) is provided on the outer wall of the rotating shaft (3).

2. The cold heading device for nuts according to claim 1, characterized in that: A compression spring (42) is clamped and fixed between the two extrusion blocks (41), the one-way ratchet (43) has a through hole in the middle, and a torsion spring (47) is connected between the two contact rods (45), the torsion spring (47) being located inside the through hole.

3. The cold heading device for nuts according to claim 2, characterized in that: A circular hole is provided at the overlapping part of the two contact rods (45), and the rotating shaft (3) is slidably inserted in the circular hole. The side wall of the rotating shaft (3) is fixed to one side of the one-way ratchet (43) by welding. The rotation center line of the rotating shaft (3) coincides with that of the one-way ratchet (43).

4. A cold heading device for nuts according to claim 3, characterized in that: A hollow bracket (33) is movably mounted on the outer wall of the rotating shaft (3) via a bearing. A friction block (32) is slidably mounted on the side wall of the hollow bracket (33). A push rod (31) is hinged to one side of the friction block (32). One end of the push rod (31) is hinged to the outer wall of the rotating shaft (3).

5. A cold heading device for nuts according to claim 4, characterized in that: The friction blocks (32) are arranged in pairs, and the two friction blocks (32) that are assembled together slide in contact.

6. A cold heading device for nuts according to claim 5, characterized in that: The bottom of the conical shell (12) is connected to a hollow support rod (11), and the hollow support rod (11) is fixedly connected to the cold heading mold (1) by welding. One side of the conical shell (12) is connected to an external pressure water source.

7. A cold heading device for nuts according to claim 6, characterized in that: The inner wall of the cold heading mold (1) is embedded with an arc-shaped permeable mesh (13), one side of which has the same shape as the inner wall of the cold heading mold (1).

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