Cold heading die assembly with material receiving function

Abstract

The utility model discloses a cold upsetting fixed mould assembly with material receiving function, including core rod (1), the middle part of core rod (1) forms step portion (2), and one end of core rod (1) is slidably connected with guide sleeve (3), and guide sleeve (3) and step portion (2) are connected with each other through small spring (4), and the other end of core rod (1) is slidably connected with cold upsetting mould (5), and cold upsetting mould (5) and step portion (2) are connected with each other through big spring (6), and the inside of cold upsetting mould (5) is equipped with the material receiving rod (7) of fixed connection in the end of core rod (1), and the material receiving rod (7) is used to contract inwards after being extruded by clamp (11) and is mutually buckled with blank when blank moves to coaxial position with clamp (11). The utility model can position blank during blank feeding process, and makes blank and cold upsetting mould keep coaxial state.

Description

Technical Field

[0001] This utility model relates to a cold heading device, and more particularly to a cold heading mold assembly with a material receiving function. Background Technology

[0002] The structure of existing cold heading dies is generally as shown in patents 202410455354.9 and 202420785164.9, including a die core, a punch, and a clamp. The die core and punch are fixed on a fixed die frame and a moving die frame, respectively. The clamp is located between the die core and the punch and conveys the blank through lateral movement. In use, the clamp first moves the blank to a position coaxial with the die core and punch. Then, the punch pushes out to push the blank into the die core, and cold heading is achieved by extrusion. After cold heading, the punch returns to its original position, and then the ejector pin on the inside of the die core pushes the blank back into the clamp, which then continues to move the blank to the next station.

[0003] However, the aforementioned process has a drawback: when the punch pushes the blank from the clamp into the die core, the blank is in a brief, unconstrained state before entering the die core after leaving the clamp. This causes the blank to tilt or shift due to gravity, thus reducing the positioning effect. Furthermore, the clamp's displacement accuracy limits the blank and die core from being perfectly coaxial after the clamp is in place, resulting in a certain positional deviation. For high-precision cold heading dies, this can easily cause the blank to collide with the edge of the die core's inner hole during movement, reducing the processing quality of the blank.

[0004] Therefore, existing cold heading dies cannot limit the movement of the blank during the feeding process. Utility Model Content

[0005] The purpose of this invention is to provide a cold heading die assembly with a material receiving function. It can limit the movement of the blank during the feeding process, keeping the blank and the cold heading die coaxial.

[0006] The technical solution of this utility model: a cold heading die assembly with a material receiving function includes a mandrel, a stepped portion formed in the middle of the mandrel, a guide sleeve slidably connected to one end of the mandrel, the guide sleeve and the stepped portion being connected to each other by a small spring, a cold heading die slidably connected to the other end of the mandrel, the cold heading die and the stepped portion being connected to each other by a large spring, and a material receiving rod fixedly connected to the end of the mandrel on the inner side of the cold heading die. The material receiving rod is used to retract inward after being squeezed by the clamps and to engage with the blank when the blank moves to the coaxial position with the clamps.

[0007] In the aforementioned cold heading die assembly with receiving function, the end of the mandrel extends to the outside of the guide sleeve and is connected to a pressure plate. A limit rod is slidably connected to the guide sleeve around the mandrel. One end of the limit rod extends to the outside of the guide sleeve and fits against the pressure plate. The other end of the limit rod extends to the outside of the guide sleeve and is used to compress and limit the large spring.

[0008] In the aforementioned cold heading die assembly with material receiving function, a pressure ring is provided between the large spring and the stepped portion, which is sleeved on the outside of the mandrel, and the end of the limiting rod and the pressure ring are in contact with each other.

[0009] In the aforementioned cold heading die assembly with material receiving function, the pressure plate is threadedly connected to the end of the mandrel.

[0010] In the aforementioned cold heading die assembly with material receiving function, the guide sleeve forms a spring groove at one end near the step, and one end of the small spring extends into the spring groove and fits against the inner end face of the spring groove.

[0011] The aforementioned cold heading die assembly with receiving function also includes a clamp located outside the cold heading die. One side of the clamp forms a pressing surface that engages with the receiving bar. The pressing surface is used to generate axial pressing force on the receiving bar as the clamp moves, causing the receiving bar to contract inward under the pressing action.

[0012] Compared with the prior art, this utility model has the following characteristics:

[0013] (1) This utility model, through the cooperation of the mandrel, small spring and guide sleeve, enables the receiving rod to extend to the outside of the cold heading die in its natural state and to extend and retract under the action of external force; on this basis, when the clamp drives the blank to move laterally, the receiving rod is squeezed inward by the clamp and retracts. When the blank moves to a position coaxial with the receiving rod, the receiving rod is pushed out under the drive of the small spring and engages with the blank; when the punch pushes the blank, the receiving rod can retract into the cold heading die along with the blank and maintain the engagement limit of the blank during the retraction process, so that the blank and the cold heading die are kept coaxial and the feeding stability of the blank is improved.

[0014] (2) By using the combination of pressure plate and limit rod, the ejection position of large spring can be limited so that the receiving rod will not be obstructed by large spring when it is in the receiving position. On this basis, by connecting the pressure plate to the end of the core rod by thread, the axial position of the receiving rod can be adjusted by adjusting the axial position of the pressure plate to adjust the axial position of the receiving rod in its natural state, thereby improving the positioning accuracy and receiving stability of the receiving rod.

[0015] Therefore, this utility model can limit the blank during the feeding process, so that the blank and the cold heading die remain coaxial. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model before the billet is fed;

[0017] Figure 2 This is a schematic diagram of the structure of this utility model during the cold heading process;

[0018] Figure 3 This is a schematic diagram of the structure of this utility model after it has been fully ejected;

[0019] Figure 4 This is a schematic diagram of the structure of this utility model when the receiving rod and the clamp are separated.

[0020] The markings in the attached diagram are as follows: 1-Mandrel, 2-Step section, 3-Guide sleeve, 4-Small spring, 5-Cold heading die, 6-Large spring, 7-Receiving rod, 8-Pressure plate, 9-Limiting rod, 10-Pressure ring, 11-Clamping clamp, 12-Drive rod. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0022] Example. A cold heading die assembly with material receiving function is configured as follows: Figure 1 As shown, the device includes a mandrel 1, with a stepped portion 2 formed in the middle. A guide sleeve 3 is slidably connected to one end of the mandrel 1. The mandrel 1 and the guide sleeve 3 are nested together. The outer wall of the guide sleeve 3 can be threaded onto an external mounting bracket. The guide sleeve 3 and the stepped portion 2 are connected to each other via a small spring 4 sleeved on the outside of the mandrel 1. A cold heading die 5 is slidably connected to the other end of the mandrel 1. The mandrel 1 and the cold heading die 5 are nested together. The cold heading die 5 and the stepped portion 2 are connected via a small spring 4 sleeved on the outside of the mandrel 1. Large springs 6 are connected to each other outside the mandrel 1. The elastic force of the large springs 6 is greater than that of the small springs 4. The inner side of the cold heading mold 5 is provided with a receiving rod 7 fixedly connected to the end of the mandrel 1. The middle part of the receiving rod 7 is provided with a stepped surface for pushing the blank. The receiving rod 7 can be fixed by a set screw after fastening, or it can be directly threaded to the end of the mandrel 1. The receiving rod 7 is used to retract inward after being squeezed by the clamp 11, and to engage with the blank when the blank moves to the coaxial position with the clamp 11.

[0023] When the cold heading die assembly is in the receiving state, one end of the receiving rod 7 extends to the outside of the cold heading die 5, and the large spring 6 is in the natural state.

[0024] When the mandrel 1 is fully ejected, the large spring 6 is fully contracted and the axial position of the receiving rod 7 is further outward compared to the receiving state.

[0025] The end of the mandrel 1 extends to the outside of the guide sleeve 3 and is connected to the pressure plate 8. Limiting rods 9 are slidably connected to the guide sleeve 3 around the mandrel 1. There are multiple limiting rods 9 distributed in a ring on the guide sleeve 3. One end of the limiting rod 9 extends to the outside of the guide sleeve 3 and is in contact with the pressure plate 8. The other end of the limiting rod 9 extends to the outside of the guide sleeve 3 and is used to compress and limit the large spring 6.

[0026] A pressure ring 10 is provided between the large spring 6 and the step portion 2, which is sleeved on the outside of the core rod 1. The end of the limiting rod 9 and the pressure ring 10 are in contact with each other. The step portion 2 is provided with a sliding groove for fastening and connecting the limiting rod 9 around its perimeter.

[0027] The number of pressure plates 8 is two, and both are threaded to the end of the mandrel 1. The two pressure plates 8 are locked in axial position by fitting together to prevent axial movement of the pressure plates 8.

[0028] The guide sleeve 3 has a spring groove at one end near the step portion 2, and one end of the small spring 4 extends into the spring groove and fits against the inner end face of the spring groove.

[0029] It also includes a clamp 11 located outside the cold heading die 5. One side of the clamp 11 forms a pressing surface that engages with the receiving rod 7. The pressing surface is used to generate axial pressing force on the receiving rod 7 as the clamp 11 moves, causing the receiving rod 7 to contract inward under the pressing action. The pressing surface is an inclined surface or a plane.

[0030] When the extrusion surface is inclined, the end of the receiving rod 7 can be set as a spherical surface as needed, so as to cooperate with the extrusion surface to achieve compression and contraction when the clamp 11 moves laterally; when the extrusion surface is flat, the manufacturer can change the movement path of the clamp 11 from a straight line to an arc, so that the clamp 11 moves axially during the feeding process and drives the receiving rod 7 to contract during the movement.

[0031] The mandrel 1 is provided with a drive rod 12 on the side away from the punch. The drive rod 12 is used to push the mandrel 1 from the rear end, so that the mandrel 1 overcomes the elastic force of the large spring 6 and pushes outward to realize the ejection of the billet.

[0032] The working principle of this utility model is as follows: During use, the clamp 11 moves the billet laterally, applying axial pressure to the receiving rod 7 during this movement. This pressure causes the receiving rod 7 to retract inwards, overcoming the elasticity of the small spring 4. When the billet reaches the feeding position, the receiving rod 7, driven by the small spring 4, extends again and engages with the groove or inner hole of the billet, thus achieving a locking and limiting action on the billet. After the receiving rod 7 and the billet are engaged, the clamp 11 opens, and the punch pushes out, causing the billet and the receiving rod 7 to move together towards the cold heading die 5, thereby achieving the pushing action of the billet.

[0033] After the billet is moved to the cold heading position by the pusher, the punch can push the receiving rod 7 away from the billet, thus replacing the receiving rod 7 in cold heading the billet; alternatively, the receiving rod 7 can remain engaged with the billet, thereby limiting the billet. After the billet is cold-headed, the punch returns to its original position, and at the same time, the drive rod 12 pushes out, causing the mandrel 1 to overcome the elastic force of the large spring 6 and push outward. The mandrel 1, through the receiving rod 7, drives the billet to detach from the cold heading mold 5 and move to the clamping position. When the billet is in place, the mandrel 1 is in a fully ejected state and the large spring 6 is fully retracted. At this time, the clamp 11 re-clamps the billet while the drive rod 12 retracts, so that the large spring 6 can quickly apply pressure to the mandrel 1 after rebounding. Under this compression, the mandrel 1 overcomes the elastic force of the small spring 4 and drives the mandrel 1 to retract significantly inward, thereby causing the receiving rod 7 to detach from the billet as the mandrel 1 retracts. The clamp 11 pulls the billet into the next station at the moment the receiving bar 7 retracts, and then the mandrel 1 returns to the initial position by the elastic force of the small spring 4 after losing the pressure of the large spring 6.

Claims

1. A cold heading mold assembly with material receiving function, characterized in that: Includes a mandrel (1), a stepped portion (2) is formed in the middle of the mandrel (1), a guide sleeve (3) is slidably connected to one end of the mandrel (1), the guide sleeve (3) and the stepped portion (2) are connected to each other by a small spring (4), the other end of the mandrel (1) is slidably connected to a cold heading mold (5), the cold heading mold (5) and the stepped portion (2) are connected to each other by a large spring (6), the inner side of the cold heading mold (5) is provided with a receiving rod (7) fixedly connected to the end of the mandrel (1), the receiving rod (7) is used to shrink inward after being squeezed by the clamp (11), and to engage with the blank when the blank moves to the coaxial position with the clamp (11).

2. The cold heading die assembly with receiving function according to claim 1, characterized in that: The end of the mandrel (1) extends to the outside of the guide sleeve (3) and is connected to the pressure plate (8). A limit rod (9) is slidably connected to the guide sleeve (3) around the mandrel (1). One end of the limit rod (9) extends to the outside of the guide sleeve (3) and fits against the pressure plate (8). The other end of the limit rod (9) extends to the outside of the guide sleeve (3) and is used to squeeze and limit the large spring (6).

3. The cold heading die assembly with receiving function according to claim 2, characterized in that: A pressure ring (10) is provided between the large spring (6) and the step portion (2) and is sleeved on the outside of the mandrel (1). The end of the limiting rod (9) and the pressure ring (10) are in contact with each other.

4. The cold heading die assembly with receiving function according to claim 2, characterized in that: The pressure plate (8) is threaded to the end of the mandrel (1).

5. The cold heading die assembly with receiving function according to claim 1, characterized in that: The guide sleeve (3) has a spring groove at one end near the step (2), and one end of the small spring (4) extends into the spring groove and fits against the inner end face of the spring groove.

6. The cold heading die assembly with receiving function according to claim 1, characterized in that: It also includes a clamp (11) located outside the cold heading die (5). One side of the clamp (11) forms a pressing surface that engages with the receiving rod (7). The pressing surface is used to generate axial pressing force on the receiving rod (7) as the clamp (11) moves, causing the receiving rod (7) to contract inward under the pressing action.

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