High-precision cold forging die

Abstract

The utility model discloses a high-precision cold forging die. The high-precision cold forging die comprises a stamping die and a main die, the stamping die comprises a stamping rod and a stamping seat, and the stamping rod is connected to the stamping seat; a forming cavity is formed in the main die, a main die rod is arranged in the forming cavity, and the main die rod is used for being matched with the adjacent punching rod to extrude a to-be-machined part and being matched with the punching rod for forging and forming in the forming cavity; a limiting piece is further arranged, and the limiting piece is connected into the main die and used for abutting against the side wall of the main die rod so as to limit axial rotation of the main die rod around the main die rod.

Description

Technical Field

[0001] The utility model relates to the technical field of cold forging dies, in particular to a high-precision cold forging die. Background Art

[0002] Cold heading is a processing method that presses and forms metal materials at room temperature. In the cold heading process, the metal material is gradually formed into the desired shape and size after multiple extrusions and stretching. The cold heading process is usually used to produce metal parts such as bolts, nuts, and pins.

[0003] The main features of the cold heading process include:

[0004] 1. The pressing process does not require heating of the metal material, so it is called "cold" upsetting.

[0005] 2. The strength and hardness of metal materials can be improved through multiple extrusion and forming processes.

[0006] 3. The cold heading process can achieve efficient mass production and improve production efficiency.

[0007] 4. It can produce metal parts with high dimensional accuracy and smooth surface.

[0008] 5. Cold heading process is suitable for various metal materials, such as carbon steel, alloy steel, stainless steel, etc.

[0009] In general, cold heading process is a commonly used metal processing method with the characteristics of high efficiency, high precision and high quality.

[0010] At present, when the main mold bar reciprocates back and forth, the main mold bar is not fixed in the circumferential direction, so it will rotate during production. When forming teeth, the position of the teeth will appear at any position of the part circumference. Since the wall thickness of the tail of the part is not absolutely uniform, the size of the teeth is uneven, resulting in unstable pull-off force of the teeth.

[0011] Therefore, a high-precision cold forging die is still needed to solve the above problems. Utility Model Content

[0012] The utility model provides a high-precision cold forging die for solving the above problems.

[0013] The purpose of the utility model is achieved by the following technical solutions:

[0014] A high-precision cold forging die, comprising:

[0015] A punching die, the punching die comprising a punching rod and a punching seat, the punching rod being connected to the punching seat;

[0016] A main mold, wherein a forming cavity is formed on the main mold, and a main mold rod is arranged in the forming cavity. The main mold rod is used to cooperate with a nearby punch rod to extrude the workpiece to be processed and cooperate with forging and forming in the forming cavity;

[0017] A limiting member is also provided, which is connected in the main mold and is used to abut against the side wall of the main mold rod to limit the axial rotation of the main mold rod around the main mold rod.

[0018] In one embodiment, a limiting hole is provided in the main mold at a position corresponding to the top of the main mold rod, and the limiting member is connected in the limiting hole;

[0019] A limiting surface is formed on the side wall of the main mold bar, and the end of the limiting member abuts against the limiting surface.

[0020] In one embodiment, the limiting member is a threaded column, and the limiting hole is a threaded hole.

[0021] In one embodiment, the limiting member includes an elastic member and a contact member, the elastic member is connected to the contact member and is in a compressed state in the limiting hole, so that the contact member elastically contacts the limiting surface.

[0022] In one embodiment, it also includes a material return mechanism, which includes a material return ring and a connecting rod. The material return ring is located in the molding cavity and is sleeved on the outer peripheral side of the main mold rod. The connecting rod is connected to the material return ring and is used to drive the material return ring to move relative to the main mold rod along the axial direction of the main mold rod to push the molded workpiece out of the molding cavity.

[0023] In one embodiment, the connecting rod extends from the top of the main mold and is connected to a reciprocating mechanism, wherein the reciprocating mechanism includes a cam and a push rod, wherein the eccentric portion of the cam is rotationally connected to one end of the push rod, and the other end of the push rod is rotationally connected to the connecting rod.

[0024] Compared with the prior art, the beneficial effects of the present invention include at least:

[0025] A limit piece is provided inside the main die near the main die rod, and the limit piece abuts against the side wall of the main die rod. When the punch die is forging toward the main die, the main die rod used to cooperate in forming the shape of the workpiece will not rotate by itself, thereby preventing the abutting end on one side of the workpiece from rotating during forging, causing deformation of the tooth shape on the workpiece, and resulting in uneven local wall thickness, which cannot meet the material strength requirements of the tooth portion of the workpiece after forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the cold forging die in the forging state of an embodiment of the utility model;

[0027] Figure 2It is a structural schematic diagram of the cold forging die in the material withdrawal state of an embodiment of the utility model;

[0028] Figure 3 It is a structural schematic diagram of a cold forging die material withdrawal mechanism of an embodiment of the utility model.

[0029] In the figure:

[0030] 1. Punch die; 11. Punch rod; 12. Punch seat; 2. Main die; 21. Forming cavity; 22. Main die rod; 221. Limiting surface; 23. Limiting hole; 3. Limiting member; 4. Material withdrawal mechanism; 41. Material withdrawal ring; 42. Connecting rod; 5. Product. DETAILED DESCRIPTION

[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0032] The words expressing positions and directions described in the present utility model are all explained by taking the drawings as examples, but they can be changed as needed, and all the changes are included in the protection scope of the present utility model.

[0033] Reference Figure 1-3 The utility model provides a high-precision cold forging die, comprising:

[0034] The punching die 1 comprises a punching rod 11 and a punching seat 12, wherein the punching rod 11 is connected to the punching seat 12. The top end surface of the punching rod 11 is used to push the entire workpiece to be processed into the forming cavity 21 of the main die 2 as a pressure applying party for forging.

[0035] A main mold 2 is provided with a molding cavity 21, and an opening is provided at the bottom of the main mold 2 as an inlet and outlet of the workpiece to be processed. A main mold rod 22 is provided in the molding cavity 21, and the main mold rod 22 is used to cooperate with the nearby punch 11 to extrude the workpiece to be processed and cooperate with forging and forming in the molding cavity 21.

[0036] A stopper 3 is also provided, which is connected to the main mold 2 and is used to abut against the side wall of the main mold rod 22 to limit the main mold rod 22 from rotating around the axial direction of the main mold rod 22. The main mold rod 22 is fixed inside the main mold 2, wherein the stopper 3 abuts against the main mold rod 22 from the axial direction perpendicular to the main mold rod 22 to prevent the end of the main mold rod 22 that needs to bear the pressure from rotating during the molding process of the workpiece, so as to cause the shape of the molded part to be irregular, the tooth shape formed is lower than the standard, and the strength is insufficient.

[0037] In one embodiment, a limiting hole 23 is opened in the main mold 2 at the top of the main mold rod 22 , and the limiting member 3 is connected in the limiting hole 23 .

[0038] A limiting surface 221 is formed on the side wall of the main mold rod 22, and the end of the limiting member 3 abuts against the limiting surface 221, wherein the top cross-section of the main mold rod 22 can be a pentagon or a hexagon, the limiting surface 221 is, for example, a plane, and the limiting member 3 is connected in the limiting hole 23 to play an abutting role.

[0039] In a specific embodiment, the stopper 3 is a threaded column, the stopper hole 23 is a threaded hole, the stopper 3 can be a threaded column, and during installation, the upper mold can be a plurality of combined parts. Referring to the structure shown in the figure, when assembled to the main mold rod 22, the main mold rod 22 can be first placed in the molding cavity 21, and then the threaded column can be threadedly connected on one side until one end of the threaded column abuts the stopper surface 221. It can effectively prevent the main mold 2 from rotating when participating in forging.

[0040] More specifically, the limiting member 3 includes an elastic member and an abutting member, the elastic member is connected to the abutting member, and is in a compressed state in the limiting hole 23, so that the abutting member elastically abuts against the limiting surface 221. The elastic member is, for example, an elastic metal spring, and the abutting member is, for example, a metal columnar member. Through the elastic extrusion of the elastic member, the abutting member always elastically abuts against the side wall of the main mold rod 22, always elastically limits the main mold rod 22, and prevents the main mold rod 22 from rotating. The main mold rod 22 will be subjected to the kinetic energy of the collision during forging. The elastic abutment can avoid damage to the connection surface between the abutting member and the main mold rod 22, and always maintain a good limiting relationship.

[0041] In one embodiment, a material stripping mechanism 4 is further included, the material stripping mechanism 4 includes a material stripping ring 41 and a connecting rod 42, the material stripping ring 41 is located in the molding cavity 21 and sleeved on the outer peripheral side of the main mold rod 22, the connecting rod 42 is connected to the material stripping ring 41, and is used to drive the material stripping ring 41 to move relative to the main mold rod 22 along the axial direction of the main mold rod 22, so as to push the molded workpiece out of the molding cavity 21. The main mold 2 is provided with a through hole for the connecting rod 42 to move.

[0042] In another embodiment, the connecting rod 42 extends from the top of the main mold 2 and is connected to a reciprocating mechanism, the reciprocating mechanism includes a cam and a push rod, the eccentric part of the cam is rotatably connected to one end of the push rod, and the other end of the push rod is rotatably connected to the connecting rod 42. The center of the cam can be connected to a motor, and when working, the motor drives the cam to rotate, thereby driving the ejection ring 41 to always do reciprocating motion. During molding, the bottom edge of the ejection ring abuts against the top of the annular product 5, and the main mold rod 22 forms the inner wall and tooth shape of the product 5. After forging, the ejection ring is driven by the cam to push the product 5 out from the bottom, then retract, and repeat the above steps.

[0043] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the utility model. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the utility model without departing from the principles and purpose of the utility model. All of these changes should fall within the scope of protection of the claims of the utility model.

Claims

1. A high-precision cold forging die, characterized in that: include: A punching die, the punching die comprising a punching rod and a punching seat, the punching rod being connected to the punching seat; A main mold, wherein a forming cavity is formed on the main mold, and a main mold rod is arranged in the forming cavity. The main mold rod is used to cooperate with a nearby punch rod to extrude the workpiece to be processed and cooperate with forging and forming in the forming cavity; A limiting member is also provided, which is connected in the main mold and is used to abut against the side wall of the main mold rod to limit the axial rotation of the main mold rod around the main mold rod.

2. The high-precision cold forging die according to claim 1, characterized in that: A limiting hole is provided in the main mold at the top of the main mold rod, and the limiting member is connected in the limiting hole; A limiting surface is formed on the side wall of the main mold bar, and the end of the limiting member abuts against the limiting surface.

3. The high-precision cold forging die according to claim 2, characterized in that: The limiting member is a threaded column, and the limiting hole is a threaded hole.

4. The high-precision cold forging die according to claim 2, characterized in that: The limiting member includes an elastic member and a contact member. The elastic member is connected to the contact member and is in a compressed state in the limiting hole, so that the contact member elastically contacts the limiting surface.

5. The high-precision cold forging die according to claim 3 or 4, characterized in that: It also includes a material return mechanism, which includes a material return ring and a connecting rod. The material return ring is located in the molding cavity and is sleeved on the outer peripheral side of the main mold rod. The connecting rod is connected to the material return ring and is used to drive the material return ring to move relative to the main mold rod along the axial direction of the main mold rod to push the molded workpiece out of the molding cavity.

6. The high-precision cold forging die according to claim 5, characterized in that: The connecting rod extends from the top of the main mold and is connected to a reciprocating mechanism, which includes a cam and a propulsion rod. The eccentric part of the cam is rotatably connected to one end of the propulsion rod, and the other end of the propulsion rod is rotatably connected to the connecting rod.

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