Cold header clamp device

Abstract

The invention discloses a cold header clamp device, and belongs to the field of new energy automobile part production. In order to solve the technical problems that when an existing cold header clamp system adopts a large-diameter T-shaped male die, the large-diameter T-shaped male die and a clamp are prone to motion interference, the male die needs to be cut, and consequently the strength is reduced, avoiding is achieved through the cooperative action of opening, closing and lifting of the clamp. According to the technical scheme, a clamp box assembly is guided by a rail to do lifting motion, a pull button drives a core block to move up and down so as to control opening and closing of clamp legs, a lifting locking mechanism is matched with a small spring through a push rod to fix or release the position of a clamp box, and a reset spring ensures that the clamp legs are closed to clamp a workpiece. The device can prevent the convex die from colliding with the clamp, keeps the complete structural strength of the convex die, is adaptive to the high-frequency production rhythm of 40-100 times per minute, remarkably improves the part machining efficiency, prolongs the service life of the die, and is suitable for continuous cold heading forming of various special-shaped aluminum alloy parts.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle parts production, and particularly to a cold heading machine clamp device. Background Art

[0002] In the field of new energy vehicle parts manufacturing, cold heading machines are widely used in the forming process of metal parts. Some aluminum alloy parts with special shapes (such as T-shaped structural parts) need to be cold headed using a large-diameter T-shaped punch. However, the clamp device of traditional cold heading machines has significant defects during operation: when the punch reciprocates left and right, especially at the extreme positions near the die, even when the conventional clamp is fully opened, it will still interfere with the movement of the punch (as shown in Figure 1 ). To avoid collisions, the prior art usually cuts the interfering part of the punch, but this will seriously weaken the overall strength and durability of the punch, resulting in a shortened die life, increased maintenance costs, and inability to meet the continuous production requirements of high-precision parts.

[0003] Currently, no publicly available technical solution for a clamp device that can effectively solve such interference problems has been found. Traditional clamp devices only have a single opening and closing function and lack an adjustment mechanism that coordinates with the movement of the punch, making it difficult to adapt to the complex working conditions of large-diameter punches. Therefore, there is an urgent need for a new type of clamp device that can stably hold the workpiece, avoid collisions with the punch through dynamic adjustment of the clamp position, and take into account both die strength and production efficiency. Summary of the Invention

[0004] The purpose of the solution of the present application is to adopt a specially designed clamp device, which adds an overall lifting action while the clamp opens and closes, and can avoid the impact between the punch and the clamp. This device can adapt to the cold heading production of various parts.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a cold heading machine clamp device, which is characterized by including:

[0007] A clamp box assembly, which is welded by a clamp box top plate, clamp box side plates, and a clamp box bottom plate, and forms an accommodation space inside;

[0008] A track assembly, fixed in front of the die cavity of the cold heading machine, provided with a groove and a stop protrusion in the up and down directions, and used to guide the lifting movement of the clamp box assembly;

[0009] A clamp driving mechanism, including a pull button and a core block, the pull button is connected to the driving lever of the cold heading machine, and the core block is linked with the pull button and controls the opening and closing of the clamp legs through a circular arc profile when moving up and down;

[0010] The clamp leg assembly includes a pair of clamp legs and clamp jaws. The clamp legs are hinged to the clamp box assembly through pin posts and perform opening and closing actions through the movement of the core block. The clamp jaws are connected to the ends of the clamp legs to clamp the workpiece;

[0011] The lifting and locking mechanism includes a push rod, a stop block and a small spring. The push rod can move horizontally and is inserted into the small hole of the track groove to fix the position of the clamp box. The small spring drives the push rod to reset;

[0012] The return spring is used to close the clamp legs when the core block moves downward;

[0013] Among them, the clamp device synchronously controls the opening and closing of the clamp legs and the lifting of the clamp box assembly through the up and down movement of the pull button, avoiding interference with the large-diameter T-shaped punch of the cold heading machine.

[0014] Preferably, the core block is made of wear-resistant steel, and a protrusion is provided at the end of its arc-shaped contour to limit the maximum opening angle of the clamp legs.

[0015] Preferably, a stop protrusion is provided at the bottom of the groove of the track assembly to limit the lower limit position of the clamp box assembly.

[0016] Preferably, the top plate, side plate and bottom plate of the clamp box are welded with 7-series aluminum alloy to improve wear resistance and structural strength.

[0017] Preferably, the clamp jaws and the clamp legs are connected by adjustable screws to adapt to the clamping requirements of workpieces of different sizes.

[0018] Preferably, the return spring is a long spring and is always in a tensioned state, and is used to close the clamp legs when the core block moves downward.

[0019] Preferably, the working process of the lifting and locking mechanism is as follows: when the core block moves up to contact the push rod at the pit, the push rod contracts under the action of the small spring, and the clamp box is unlocked and moves up along the track; when the core block moves down and disengages from the push rod, the push rod is inserted into the small hole of the track to fix the clamp box.

[0020] Preferably, the arc-shaped part of the clamp leg contacts the arc-shaped contour of the core block, and the up and down movement of the core block is converted into the rotational opening and closing action of the clamp leg.

[0021] Preferably, the device is provided with 6 groups of clamp boxes, which move periodically in the horizontal direction to achieve continuous production.

[0022] Preferably, the clamping surface of the clamp jaws is arc-shaped and is in close contact with the outer surface of the workpiece to improve the clamping stability.

[0023] With the clamp device of the present invention, it is possible to simply, stably and reliably clamp and transfer product parts, achieving the purpose of avoiding collision interference with a punch having a relatively large diameter, and the effect is good after practical application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for the description in the embodiments of the present application will be briefly introduced below.

[0025] Figure 1 It is a schematic diagram of the movement interference of the existing cold heading machine clamp system;

[0026] Figure 2 It is a schematic external view a of the closed state of the clamp device of the present invention;

[0027] Figure 3 It is a schematic external view b of the closed state of the clamp device of the present invention;

[0028] Figure 4 It is a schematic structural view of removing the clamp cover in the closed state of the present clamp system;

[0029] Figure 5 It is a schematic structural view a of removing the clamp cover in the open state of the present clamp device;

[0030] Figure 6 It is a schematic structural view b of removing the clamp cover in the open state of the present clamp device;

[0031] Figure 7 It is a schematic structural view c of removing the clamp cover in the open state of the present clamp device;

[0032] Figure 8 It is a schematic external view of the track of the present invention;

[0033] Figure 9 It is a schematic external view of the core block of the present invention;

[0034] Figure 10 It is a schematic external view of the clamp leg of the present invention;

[0035] Figure 11 It is a schematic external view of the clamp claw of the present invention.

[0036] Among them, 1 is a pull button, 2 is a track, 3 is a pin, 4 is a long spring B, 5 is a clamp leg, 6 is a clamp claw, 7 is a product part, 8 is a small spring, 9 is a stop block, 10 is a push rod, 11 is a core block, 12 is a top plate of the clamp box, and 13 is a die cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Embodiments of the present application will be described in detail below. Examples of each embodiment are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application.

[0038] Those skilled in the art of this technology can understand that unless specifically stated, the singular forms "a", "an" and "the" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the specification of the present application means the presence of features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups. The phrase "and / or" used herein includes all or any unit of one or more related listed items and all combinations.

[0039] To make the purpose, technical solution and advantages of the present application clearer, the specific implementation manners of the present application will be further described in detail below with reference to the drawings.

[0040] Embodiment 1:

[0041] As Figure 2-11 shown, a clamping device for a cold heading machine of the present invention has the main structure as follows:

[0042] A clamp box assembly, which is welded by a clamp box top plate 12, clamp box side plates and a clamp box bottom plate, and forms an accommodation space inside;

[0043] A track assembly, fixed in front of the die cavity 13 of the cold heading machine, is provided with grooves and stop protrusions in the up and down directions for guiding the lifting movement of the clamp box assembly;

[0044] A clamp driving mechanism, including a pull button 1 and a core block 11, the pull button 1 is connected to the driving lever of the cold heading machine, and the core block 11 is linked with the pull button 1 and controls the opening and closing of the clamp legs 5 through an arc-shaped profile when moving up and down;

[0045] A clamp leg assembly, including a pair of clamp legs 5 and clamp claws 6, the clamp legs 5 are hinged to the clamp box assembly through pin posts 3 and realize the opening and closing actions through the movement of the core block 11, and the clamp claws 6 are connected to the ends of the clamp legs 5 to clamp the workpiece;

[0046] A lifting locking mechanism, including a push rod 10, a stop block 9 and a small spring 8, the push rod 10 can move horizontally and insert into the small holes of the track groove to fix the position of the clamp box, and the small spring 8 drives the push rod 10 to reset;

[0047] A return spring, used to close the clamp legs 5 when the core block 11 moves down;

[0048] Among them, the clamp device synchronously controls the opening and closing of the clamp legs 5 and the lifting of the clamp box assembly through the up-and-down movement of the pull button 1, avoiding interference with the large-diameter T-shaped punch of the cold heading machine.

[0049] Among them, the pull button 1 is connected to the driving lever for opening and closing the clamp of the cold heading machine. Driven by the lever, it can move up and down, and at the same time transfer this movement to the lower core block 11, driving the core block 11 to move up and down synchronously. When the pull button 1 moves upward, the clamp claws 6 open. When the pull button moves downward, the clamp claws 6 close.

[0050] The top plate, side plates, and bottom plate of the clamp box are made of 7-series aluminum alloy, which is relatively hard and wear-resistant. They are combined into a whole by welding to form the outer shell of the clamp box.

[0051] The track 2 has a concave die in the up-and-down direction, which allows the clamp box to slide up and down in the groove. The lower end of the track has a stopping protrusion to determine the lowest position of the movement of the clamp box.

[0052] The small spring 8, the push rod 10, and the stop block 9 are combined together. The stop block 9 is fixed on the bottom plate of the clamp box. The push rod 10 can move horizontally. The small spring 8 pushes the push rod to expose the stop block 9, so that the head of the push rod 10 enters the small hole above the track, fixing the position of the clamp box on the slide rail. When the push rod retracts to its original position, it no longer fixes the position of the clamp box, and the clamp box can move up and down along the track.

[0053] The core block 11 is made of wear-resistant steel and is connected to the pull button 1. As the pull button 1 moves in the up-and-down direction, its function is to move up and down, and its arc-shaped outer contour contacts the clamp legs 5 to control the opening and closing actions of the clamp legs 5. At the end of the arc contour of the core block 11 are two protrusions for limiting the maximum opening state of the clamp legs 5.

[0054] The long spring 4 is always in a tensioned state, and its function is to pull the two clamp legs together to generate a closing action, thereby clamping the product part.

[0055] The pin column 3 is a rotating shaft fixed on the clamp box.

[0056] The clamp legs 5 are made of low-carbon steel and rotate reciprocally around the pin column. Its arc-shaped part contacts the arc part of the core block 11 to realize the control of the opening and closing actions of the clamp legs 5.

[0057] The clamp claws 6 are made of low-carbon steel. They clamp the product part after closing. The clamp claws 6 are connected to the clamp legs 5 by screws and have a certain space for relative position adjustment to adjust the clamp claws 6 so that in the closed state, the arc surface of the clamp claws 6 is in close contact with the outer circular surface of the product part to adapt to the clamping requirements of workpieces of different sizes.

[0058] The working principle of this device is as follows:

[0059] Install this device in front of the cavity of the female die of the cold heading machine and connect it to the clamping device of the cold heading machine to open and close the clamping part, move the clamping box up and down, and at the same time, the whole clamping box in a group of six performs a periodic lateral movement.

[0060] The normal operating speed of an ordinary cold heading machine is 40 - 100 working cycles per minute. During operation, the cold heading machine runs continuously to extrude the shape of the product. When the product part is extruded by the punch into the female die of the cold heading station, the raw metal is deformed under the extrusion force and becomes the preset shape. When the punch part of the cold heading machine completes the cold heading extrusion action of other stations, it starts to move away from the female die.

[0061] When the punch moves from the far end to the near end towards the female die, this device holds the product part and waits directly in front of the female die. When the punch contacts the product part, the opening and closing mechanism of the cold heading machine pulls the pull button upward through the driving lever, driving the core block to move upward. Since the arc-shaped area of the core block contacts the arc-shaped area of the clamping leg, the clamping leg starts to open under the upward movement of the core block. At this moment, the product part enters the female die.

[0062] When the punch continues to move towards the female die, the pull button and the core block continue to move upward. When the concave pit on the rod part of the core block contacts the push rod, under the action of the small spring, the push rod contracts, and the clamping box can move relative to the track. At this moment, after the protrusions at both ends of the lower part of the core block contact the arc-shaped area of the clamping leg, the clamping leg stops opening. The whole clamping box starts to move upward along the track, avoiding the punch hitting components such as the clamping claws.

[0063] The lateral movement mechanism of the clamping device operates to move the whole clamping device in the direction of the next station upward.

[0064] When the extrusion work is completed, the punch starts to move away from the female die, and the product part is ejected from the female die by the mechanism of the cold heading machine. At this moment, this device waits in front of the female die. When the product part is ejected from the female die by a certain distance, the cold heading machine starts to operate. The lever drives the pull button and the core block to move downward, and the whole clamping box moves downward. When the bottom plate of the clamping box contacts the protrusion at the lower end of the track, the clamping box stops moving downward. The core block continues to move downward, the concave pit on the rod part disengages from the push rod, and the thicker rod part pushes the push rod to move. The small head of the push rod inserts into the small hole of the track, further fixing the position of the clamping box.

[0065] The core block continues to move downward. Under the pulling force of the large spring, the two clamping legs start to close, driving the clamping claws to close and clamp the product workpiece.

[0066] In this way, the purpose of continuous production is achieved by repeating the above process.

[0067] After adopting this device, the product parts can be stably clamped and transferred simply, stably and reliably, achieving the purpose of avoiding collision and interference with the punch of larger diameter, and the effect is good after practical application.

[0068] The above content is only an example and explanation of the structure of the present invention. Those skilled in the art of this technology can make various modifications, supplements or use similar methods to replace the specific embodiments described, as long as they do not deviate from the structure of the invention or exceed the scope defined by this claim book, they should all fall within the protection scope of the present invention.

Claims

1. A cold heading machine clamp device, characterized in that: include: The clamp box assembly is welded together by a clamp box top plate, a clamp box side plate and a clamp box bottom plate, and forms a receiving space inside; The track assembly is fixed in front of the cold heading machine cavity and is provided with grooves and stop protrusions in the up-and-down directions for guiding the lifting and lowering movement of the clamp box assembly; The clamp driving mechanism includes a pull button and a core block, wherein the pull button is connected to the cold heading machine driving lever, and the core block is linked with the pull button and controls the opening and closing of the clamp legs through the arc profile when moving up and down; A clamp leg assembly, comprising a pair of clamp legs and clamp claws, wherein the clamp legs are hinged to the clamp box assembly through pins and realize opening and closing actions through the movement of the core block, and the clamp claws are connected to the ends of the clamp legs to clamp the workpiece; The lifting and locking mechanism comprises a push rod, a stopper and a small spring. The push rod can be moved laterally and inserted into a small hole in the track groove to fix the position of the clamp box. The small spring drives the push rod to reset. a return spring for closing the clamp legs as the core moves downward; The clamp device synchronously controls the opening and closing of the clamp legs and the lifting and lowering of the clamp box assembly through the up and down movement of the pull button, thereby avoiding interference with the large-diameter T-shaped punch of the cold heading machine.

2. The cold heading machine clamp device according to claim 1, characterized in that: The core block is made of wear-resistant steel, and a protrusion is provided at the end of the arc-shaped profile to limit the maximum opening angle of the clamp legs.

3. The cold heading machine clamp device according to claim 1, characterized in that: A stop protrusion is provided at the bottom of the groove of the track assembly to limit the downward movement limit position of the clamp box assembly.

4. The cold heading machine clamp device according to claim 1, characterized in that: The top plate, side plates and bottom plate of the clamp box are welded by 7 series aluminum alloy to improve wear resistance and structural strength.

5. The cold heading machine clamp device according to claim 1, characterized in that: The clamping claws are connected to the clamping legs via adjustable screws to meet the clamping requirements of workpieces of different sizes.

6. The cold heading machine clamp device according to claim 1, characterized in that: The return spring is a long spring which is always in a tensioned state and is used to close the clamp legs when the core block moves downward.

7. The cold heading machine clamp device according to claim 1, characterized in that: The working process of the lifting and locking mechanism is as follows: when the core block moves up to the pit and contacts the push rod, the push rod contracts under the action of the small spring, and the clamp box is unlocked and moves up along the track; When the core block moves down and disengages from the push rod, the push rod is inserted into the small hole of the track to fix the clamp box.

8. The cold heading machine clamp device according to claim 1, characterized in that: The arc-shaped portion of the clamp leg contacts the arc-shaped contour of the core block, and the up-and-down movement of the core block is converted into a rotating opening and closing action of the clamp leg.

9. The cold heading machine clamp device according to claim 1, characterized in that: The device is provided with 6 groups of clamp boxes, which move periodically in the lateral direction to realize continuous production.

10. The cold heading machine clamp device according to claim 1, characterized in that: The clamping surface of the clamping claw is in an arc shape and is in close contact with the outer surface of the workpiece to improve the clamping stability.

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