A material gripping device for a hot header

Abstract

The utility model relates to a material tightly holds device for hot upsetting machine, including frame, swing arm, cam, follow -up rod, tightly holds sliding axle, mounting seat, movable tightly holds fixture and fixed tightly holds fixture, the frame is fixed with the left and right horizontal setting sliding axle sleeve, tightly holds sliding axle left and right slide setting on the sliding axle sleeve, the mounting seat is fixed in tightly holds sliding axle right -end, movable tightly holds fixture is fixed in mounting seat right -end, fixed tightly holds fixture correspondingly sets up in movable tightly holds fixture right side, follow -up rod is fixed in tightly holds sliding axle left end, the sliding axle sleeve is equipped with the elastic mechanism for pushing follow -up rod moves towards right -end, swing arm middle part rotationally connects on the frame, cam rotationally connects on the frame, one end of swing arm is connected with follow -up rod cooperation, the other end is used for with cam transmission cooperation, the utility model realizes the flexible tightly holds of material, effectively prevents the position deviation or the bending of material when cutting off because of high temperature plastic deformation, has improved cutting precision and process stability significantly.

Description

Technical Field

[0001] This utility model relates to the field of hot upsetting machine technology, and in particular to a material clamping device used in a hot upsetting machine. Background Technology

[0002] In the field of metal processing, hot upsetting is a common plastic forming method, mainly used to manufacture standard or structural parts such as bolts, screws, and shafts. Its process typically includes steps such as heating, feeding, cutting, and upsetting. Among these, the cutting process is the key step in achieving fixed-length cutting, requiring precise cutting of continuous metal bars at high temperatures.

[0003] In existing technologies, hot upsetting machines generally employ a clamping-cutting-upsetting process. To ensure cutting accuracy, a clamping mechanism is typically installed at the cutting station to fix the position of the bar stock during the cutting action. However, due to the high plasticity of metal materials at high temperatures, they are prone to non-uniform plastic deformation caused by thermal stress and external forces. This can lead to bending, stretching, or localized deformation of the bar stock without effective restraint, thereby affecting the stability of the cut length and the subsequent upsetting quality.

[0004] Although existing clamping mechanisms can position the bar stock at the moment of cutting, these mechanisms are generally located upstream of the cutter (near the feed direction), while the end of the bar stock (i.e., the free end) remains suspended or semi-free. Under high-temperature conditions, this free end is prone to slight displacement or bending due to its own weight or vibration, which can cause slanted cuts, dimensional deviations, or even problems such as equipment jamming and cutter damage during the cutting process.

[0005] To address these issues, some equipment attempts to add auxiliary supports or guide devices behind the cutting and clamping mechanism. However, these structures are mostly rigid supports, unable to achieve dynamic clamping and release, and difficult to adapt to continuous automated production rhythms. In addition, rigid clamping may cause surface damage or localized crushing of the bar stock in a high-temperature softened state due to excessive clamping force.

[0006] Therefore, there is an urgent need for a device that can flexibly, controllably, and periodically clamp the end of the bar stock in order to effectively suppress the unexpected deformation of the high-temperature bar stock during the cutting process and improve the cutting accuracy and process stability. Utility Model Content

[0007] This invention proposes a flexible, controllable, and periodic clamping device for the end of bar stock in a hot heading machine, which solves the aforementioned problems existing in the use of the prior art.

[0008] The technical solution of this utility model is implemented as follows: A material clamping device for a hot forging machine includes a frame, a swing arm, a cam, a follower rod, a clamping slide shaft, a mounting base, a movable clamping clamp, and a fixed clamping clamp. A sliding bushing arranged horizontally to the left and right is fixedly connected to the frame. The clamping slide shaft is slidably disposed on the sliding bushing. The mounting base is fixed to the right end of the clamping slide shaft. The movable clamping clamp is fixed to the right end of the mounting base. The fixed clamping clamp is correspondingly disposed to the right side of the movable clamping clamp. The follower rod is fixedly connected to the left end of the clamping slide shaft. The sliding bushing is provided with an elastic mechanism for pushing the follower rod to move toward the right end. The middle part of the swing arm is rotatably connected to the frame. The cam is rotatably connected to the frame. One end of the swing arm is connected to the follower rod, and the other end is used for transmission cooperation with the cam.

[0009] Preferably, a roller is rotatably connected to one end of the swing arm facing the cam, and the roller rolls and conforms to the outer contour of the cam.

[0010] Preferably, the outer contour of the cam has a pressing flat surface and the rest is circular, with a rounded transition between the pressing flat surface and the circle. The cam has a pivot keyed to the center of the circular contour, and the pivot is rotatably connected to the frame.

[0011] Preferably, the pressing flat surface occupies between 1 / 7 and 1 / 9 of the overall outer contour of the cam.

[0012] Preferably, the elastic mechanism includes a compression spring, and the left end of the sliding bushing is fixedly connected to a pressure plate by bolts. The pressure plate has a central hole in the middle for the follower rod to pass through. The follower rod has an integrally formed abutment edge on the end near the clamping sliding shaft. The two ends of the compression spring abut against the pressure plate and the abutment edge, respectively.

[0013] Preferably, a rubber pad is fixedly connected to the end of the sliding bushing facing the outer edge.

[0014] Preferably, the end of the swing arm facing the follower rod is integrally formed with a connecting plate located on the front and rear sides of the follower rod. The connecting plate has a sliding groove from top to bottom. The follower rod is rotatably connected to a linkage shaft, and the front and rear ends of the linkage shaft are movably fitted in the sliding groove.

[0015] Preferably, a connecting rod is fixedly connected to the left end of the follower rod, a pressure plate is fixedly connected to the left end of the connecting rod, a top plate located to the right of the pressure plate is fixedly connected to the swing arm, and a pressure spring is provided between the pressure plate and the top plate.

[0016] In summary, the beneficial effects of this utility model are as follows: 1. By installing a sliding bushing on the frame and sliding the clamping slide shaft within it, along with the mounting base, movable clamping clamp, and fixed clamping clamp, rod-shaped materials can stably pass through the semi-circular groove between them. When the cam rotates and drives the swing arm, the swing arm pulls the clamping slide shaft to the left via the follower rod, overcoming the elastic force of the compression spring and moving the movable clamping clamp away from the fixed clamping clamp, thereby opening the clamping channel for material passage. When the cam rotates to the pressing flat surface, the tension of the swing arm on the follower rod disappears. Under the elastic restoring force of the compression spring, the follower rod, along with the clamping slide shaft, moves to the right, pushing the movable clamping clamp and the fixed clamping clamp to close, achieving flexible clamping of the material. This structure avoids high-temperature material damage that may be caused by rigid drive clamping. At the same time, the buffering characteristics of the spring ensure that the clamping force is moderate and adjustable, effectively preventing the material from shifting or bending due to high-temperature plastic deformation during cutting, significantly improving cutting accuracy and process stability.

[0017] 2. The clamping flat surface occupies 1 / 7 to 1 / 9 of the circumferential angle of the cam's outer contour. This ratio range has been optimized to ensure that the clamping action only occurs briefly at the moment of cutting. For most of the remaining time, the clamp is in the open state to allow the material to pass smoothly. This not only meets the clamping time requirements of the cutting process, but also prevents the material from being obstructed by excessive clamping time or deformed by high-temperature pressure. Users can make reasonable selections or fine adjustments within this range according to the actual feeding speed, cutting frequency, and blanking length. It has good process adaptability and production flexibility.

[0018] 3. A connecting rod extends from the left end of the follower rod and a pressure plate is installed. A top plate is installed on the swing arm, and a pressure spring is installed between the pressure plate and the top plate. This structure allows the thrust generated by the pressure spring to act on the swing arm, forcing the swing arm to press down, thereby ensuring that the roller on the swing arm is always in close contact with the outer contour surface of the cam. Even under equipment vibration or high-speed operation conditions, it will not disengage, ensuring the continuity and accuracy of the cam's drive on the swing arm. At the same time, the pressure spring works in conjunction with the main compression spring to maintain the preload state of each moving part of the system, improving the dynamic stability and operational reliability of the entire device. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0021] In the diagram: 1. Frame; 2. Swing arm; 21. Roller; 22. Connecting plate; 221. Sliding groove; 23. Top plate; 3. Follower rod; 31. Supporting outer edge; 32. Linkage shaft; 33. Connecting rod; 34. Pressure plate; 41. Clamping slide shaft; 42. Mounting seat; 43. Movable clamping clamp; 5. Fixed clamping clamp; 6. Sliding bushing; 61. Pressure plate; 611. Center hole; 62. Bolt; 63. Rubber pad; 7. Cam; 71. Pressing flat surface; 72. Rotating shaft; 8. Compression spring; 9. Pressure spring. Detailed Implementation

[0022] The following will refer to the appendix in the embodiments of this utility model. Figure 1-2 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] Example: like Figure 1 and Figure 2 As shown, this utility model discloses a material clamping device for a hot upsetting machine. In practical applications, the device is installed on the feeding path of the hot upsetting machine, located behind the clamping mechanism of the cutting device and on the side near the end of the rod-shaped material. The clamping device includes a frame 1, a swing arm 2, a cam 7, a follower rod 3, a clamping slide shaft 41, a mounting base 42, a movable clamping clamp 43, and a fixed clamping clamp 5. A sliding bushing 6 arranged horizontally to the left and right is fixedly connected to the frame 1. The clamping slide shaft 41 is slidably disposed on the sliding bushing 6. The sliding bushing 6 has a precision inner hole for guiding and supporting the linear reciprocating motion of the clamping slide shaft 41. Mounting base 42 is welded and fixed to the right end of clamping slide shaft 41. Movable clamping clamp 43 is pressed and fixed to the right end of mounting base 42 by screws. Fixed clamping clamp 5 is correspondingly set to the right side of movable clamping clamp 43. Fixed clamping clamp 5 is fixed on the mold box in hot forging machine and its position cannot be moved. Semi-circular slots are machined on opposite sides of both clamps. When the two clamps are closed, they form a complete circular through hole for clamping rod-shaped materials passing through it. The inner wall of the slot can be inlaid with wear-resistant copper alloy or sprayed with high-temperature resistant coating to reduce scratches on the surface of high-temperature metal rods and extend the service life of the clamps.

[0024] Additionally, the follower rod 3 is welded and fixedly connected to the left end of the clamping slide shaft 41. The follower rod 3 extends horizontally to the left, and its axis is aligned with the clamping slide shaft 41. A pressure plate 61 is fixed to the outer side of the left end of the sliding bushing 6 by bolts 62. The pressure plate 61 has a central hole 611 in the middle for the follower rod 3 to pass through. An annular abutment edge 31 is integrally formed on the side of the follower rod 3 near the clamping slide shaft 41. The abutment edge 31 and the follower rod 3 together form a stepped structure. A compression spring 8 is provided between the abutment edge 31 and the pressure plate 61. The compression spring 8 is sleeved on the outside of the follower rod 3, with its left end abutting against the pressure plate 61 and its right end abutting against the end face of the abutment edge 31, thus forming an elastic mechanism that always applies a pushing force to the right. The compression spring 8 serves as a clamping power source. When there is no external force for stretching, it pushes the clamping slide shaft 41 to move to the right, causing the movable clamping clamp 43 to close with the fixed clamping clamp 5. The compression spring 8 should ensure that it can clamp the material without causing the material to deform. The force of the compression spring 8 can be set according to the material of the specific material being produced, which is common knowledge to those skilled in the art.

[0025] In addition, a rubber pad 63 is bonded and fixed to the end face of the sliding bushing 6 facing the outer edge 31. When the clamping sliding shaft 41 moves to the right to its limit position under the push of the compression spring 8, its left end face lightly touches the rubber pad 63, using the elastic buffering effect of the rubber to absorb the impact energy at the end, avoid rigid collision between metal parts, reduce noise and protect the structure.

[0026] The swing arm 2 is an L-shaped lever structure, with its middle part rotatably connected to the frame 1 via a pin, forming a pivot point. One end of the swing arm 2 is positioned towards the cam 7, and a roller 21 is rotatably connected to this end. The roller 21 rolls and conforms to the outer contour of the cam 7.

[0027] Cam 7 is fixed to a rotating shaft 72 via a key connection. This shaft 72 is mounted on the frame 1 via bearings and can rotate freely. Cam 7 is driven by a servo motor (not shown in the figure) mounted on the frame. The outer contour of cam 7 consists of a mostly circular segment and a pressing flat surface 71, with a smooth transition between the two through rounded corners. When roller 21 is in the circular segment, cam 7 pushes one end of the swing arm 2 upward, causing the swing arm 2 to swing around the fulcrum. The other end pulls the follower rod 3 to the left, overcoming the elastic force of the compression spring 8 and causing the clamping slide shaft 41 to move to the left. This moves the movable clamping clamp 43 away from the fixed clamping clamp 5, opening the clamping channel and allowing the bar stock to be conveyed forward. As cam 7 continues to rotate, when roller 21 enters the area of ​​the pressing flat surface 71, the supporting effect of cam 7 at that point disappears, and swing arm 2 loses its outward thrust. Under the restoring force of compression spring 8, follower rod 3 is pushed to the right, causing clamping slide shaft 41 and movable clamping clamp 43 to move to the right synchronously, closing with fixed clamping clamp 5 to achieve clamping of the bar stock. Since the pressing flat surface 71 only occupies 1 / 7 to 1 / 9 of the circumferential angle of cam 7, the clamping state is only maintained for a short time, just covering the critical moment when the cutter completes the cutting action. Afterward, cam 7 rotates back to the circular section, the clamp opens again, and the next working cycle begins. The specific proportion of the pressing flat surface 71 to the overall outer contour of cam 7 is related to the material conveying speed, material cutting speed, and the length of the material cut. Users can perform a limited number of calculations to set the specific parameters according to their own production needs.

[0028] The specific structure for the connection between the swing arm 2 and the follower rod 3 is as follows: One end of the swing arm 2 facing the follower rod 3 has an integrally formed connecting plate 22 located on both the front and rear sides of the follower rod 3. A downward sliding groove 221 is formed on the connecting plate 22. A linkage shaft 32 is rotatably connected to the follower rod 3, with both ends of the linkage shaft 32 movably engaged within the sliding groove 221. This structure allows the follower rod 3 to undergo slight vertical displacement during pulling, ensuring smooth and stable transmission.

[0029] To further ensure that roller 21 remains in close contact with the surface of cam 7, a connecting rod 33 is fixedly connected to the left end of follower rod 3, and a pressure plate 34 is fixedly connected to the left end of connecting rod 33. A top plate 23 located to the right of pressure plate 34 is fixedly connected to swing arm 2, and a pressure spring 9 is provided between pressure plate 34 and top plate 23. This spring always applies downward pressure to swing arm 2, forcing swing arm 2 to rotate around the fulcrum, thereby pressing roller 21 tightly against the outer contour of cam 7. This preload structure effectively prevents roller 21 from jumping or disengaging due to equipment vibration or clearance, ensuring the continuity and accuracy of cam 7 drive.

[0030] It should also be noted that the terms used in this utility model, such as "front", "rear", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, 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. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A material clamping device for use in a hot forging machine, characterized in that: The device includes a frame, a swing arm, a cam, a follower rod, a clamping slide shaft, a mounting base, a movable clamping clamp, and a fixed clamping clamp. A sliding bushing is fixedly connected to the frame, arranged horizontally to the left and right. The clamping slide shaft slides left and right on the sliding bushing. The mounting base is fixed to the right end of the clamping slide shaft. The movable clamping clamp is fixed to the right end of the mounting base. The fixed clamping clamp is correspondingly located to the right of the movable clamping clamp. The follower rod is fixedly connected to the left end of the clamping slide shaft. The sliding bushing has an elastic mechanism for pushing the follower rod to move towards the right end. The middle of the swing arm is rotatably connected to the frame. The cam is rotatably connected to the frame. One end of the swing arm is connected to the follower rod, and the other end is used for transmission with the cam.

2. The material clamping device for a hot forging machine according to claim 1, characterized in that: A roller is rotatably connected to one end of the swing arm facing the cam, and the roller rolls and conforms to the outer contour of the cam.

3. A material clamping device for a hot forging machine according to claim 2, characterized in that: The outer contour of the cam has a pressing flat surface and the rest is circular. There is a rounded transition between the pressing flat surface and the circle. The cam has a rotating shaft keyed to the center of the circular contour. The rotating shaft is rotatably connected to the frame.

4. A material clamping device for a hot forging machine according to claim 3, characterized in that: The pressing flat surface occupies between 1 / 7 and 1 / 9 of the overall outer contour of the cam.

5. A material clamping device for a hot forging machine according to claim 1, characterized in that: The elastic mechanism includes a compression spring. The left end of the sliding bushing is fixedly connected to a pressure plate by bolts. The pressure plate has a central hole in the middle for the follower rod to pass through. The follower rod has an integrally formed abutment edge on the end near the clamping sliding shaft. The two ends of the compression spring abut against the pressure plate and the abutment edge, respectively.

6. A material clamping device for a hot forging machine according to claim 1, characterized in that: A rubber pad is fixedly connected to the end of the sliding bushing facing the outer edge.

7. A material clamping device for a hot forging machine according to claim 1, characterized in that: The swing arm has an integrally formed connecting plate on the front and rear sides of the follower rod at one end. The connecting plate has a sliding groove from top to bottom. The follower rod is connected to a linkage shaft that rotates back and forth. The front and rear ends of the linkage shaft are movably fitted in the sliding groove.

8. A material clamping device for a hot forging machine according to claim 7, characterized in that: A connecting rod is fixedly connected to the left end of the follower rod, and a pressure plate is fixedly connected to the left end of the connecting rod. A top plate located to the right of the pressure plate is fixedly connected to the swing arm, and a pressure spring is provided between the pressure plate and the top plate.

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