Hot forging clamping device and using method thereof

Abstract

The invention discloses a hot forging clamping device and a using method thereof, relates to the technical field of metal processing, and solves the problems that a blank clamped by a manual operation clamp is easy to loosen and the forging quality is influenced. The solution is as follows: a hot forging blank is placed on a working surface, and a crank is driven to rotate through forward rotation of a handle, so that a movable clamping plate is pushed to move towards one side of a fixed clamping plate; the blank to be subjected to hot forging is clamped, and meanwhile, air is sucked into the elastic bag to be stored; after hot forging is finished, the handle is rotated reversely, the crank rotates reversely to drive the movable clamping plate to be separated from the hot forging piece, and meanwhile gas stored in the elastic bag is sprayed out to blow impurities such as forging oxide skin and small hot forging pieces away from the working face. The clamping device is specially used for clamping the small hot forgings in the free forging process and has the advantages that hot forging blanks are clamped during forging, metal shaking is avoided, and the hot forgings are easily and rapidly taken down after forging is finished, and the machining efficiency of the small hot forgings is improved.

Description

Technical Field

[0001] The invention relates to the technical field of metal processing, in particular to a hot forging clamping device and a use method thereof. Background Art

[0002] After metal smelting, the ingot is processed into usable parts or products through material forming. Metal material forming includes metal cutting, grinding, stamping, bending, forging and other processes. The forging process in metal processing can ensure the continuity of the metal fiber structure, so that the fiber structure of the forging is consistent with the shape of the forging, the metal streamline is complete, the structure is dense, and the mechanical properties are good. The hardness of the forged object is high, which can ensure that the object has good mechanical properties and a long service life. In the metal free forging process, it is usually necessary to clamp the billet before the forging operation can be carried out. The clamping of large billets can be achieved by using hydraulic equipment to lift the clamps. However, for small billets, the operator often manually operates the pliers to clamp and then forge. In this way, the metal is very easy to loosen, affecting the quality of forging. For this reason, a hot forging clamping device is proposed. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a hot forging clamping device and a method of using the same, which is particularly used for clamping small billets during hot forging. It has the advantages of clamping the metal during forging to prevent metal shaking, and easily and quickly removing the hot forgings after forging. It solves the problem that manually operated clamps can easily loosen the billets, affecting the forging quality.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solutions: a hot forging clamping device, comprising a frame, a fixed clamping plate, a movable clamping plate and a purge mechanism, wherein: a baffle is fixedly arranged on the right side of the frame in the vertical direction, the purge mechanism comprises an elastic bag, a vent pipe and a nozzle, the elastic bag is arranged at the lower part of the baffle, an air inlet is arranged on the elastic bag, the nozzle is arranged at the upper part of the baffle, and the air outlet of the elastic bag is connected with the nozzle through the vent pipe; The top surface of the frame is set as a working surface, a clamping platform and a first sliding base are fixedly arranged above the working surface, a first slide groove is arranged in the core of the clamping platform along the horizontal direction, and a second slide groove is arranged on the top surface of the clamping platform; a first sliding block is movably arranged in the first slide groove, a cavity is arranged in the first sliding block along the horizontal direction, and a limiting through hole is arranged on the top surface of the first sliding block; a fixed clamping plate is fixedly arranged above the clamping platform, the movable clamping plate is arranged opposite to the fixed clamping plate, the lower part of the movable clamping plate is movably installed in the second slide groove and slides along the second slide groove, and the lower end of the movable clamping plate is recessed inwardly to set a limiting groove; A second slider is arranged in the horizontal direction in the first sliding base, and the second slider is fixedly connected to the limiting mechanism through a connecting rod, and the limiting mechanism extends to the cavity in the first slider; the limiting mechanism includes a fixing block, and a through hole is arranged in the vertical direction of the fixing block, and the first spring is movably installed in the through hole, and the solenoid is installed in the middle of the first spring tube cavity, and limiting columns are respectively arranged at the head and tail ends of the first spring, and strong magnetic sheets are respectively embedded in the opposite surfaces of the upper and lower limiting columns; in the initial state, the solenoid is energized, and the solenoid attracts the strong magnetic sheet and passes through the limiting The column compresses the first spring, and there is no friction between the limit column and the inner wall of the cavity of the first slider; when the second slider drives the connecting rod to extend, the connecting rod drives the limit mechanism to slide along the cavity in the first slider to the position of the limit through hole, at this time the solenoid loses power, the magnetic force between the solenoid and the strong magnetic sheet disappears, the first spring returns to its original state and then the limit column passes through the limit through hole and pushes into the limit groove, and the limit mechanism is connected to the movable clamping plate; the second slider drives the connecting rod to continue to extend, and the connecting rod clamps the hot forging blank on the fixed clamping plate through the limit mechanism and the movable clamping plate; The worm gear is fixedly mounted on the upper portion of the guide rail, and the worm gear is connected to the guide rail in a horizontal direction so as to prevent the worm gear from being lost.

[0005] Furthermore, the jetting direction of the nozzle is aimed at the hot forging blank.

[0006] Furthermore, a one-way air outlet valve is provided at the air outlet position of the elastic bag.

[0007] Furthermore, the fixed clamping plate and the movable clamping plate are made of hot working die steel.

[0008] A process for using the hot forging clamping device as described above comprises the following steps: S1. Place the hot forging blank in a heated state on the work surface, and then rotate the handle forward, the handle drives the worm to rotate, the worm wheel moves along the worm and drives the guide rod to retract into the guide sleeve, and the guide rod drives the crank to rotate clockwise around the support seat through the second slider; at the same time, the second slider drives the volume of the inner cavity of the elastic bag to increase through the piston rod, and air is sucked into the elastic bag; S2, in the initial state, the solenoid is energized, the solenoid attracts the strong magnetic sheet and compresses the first spring through the limit column, and there is no friction between the limit column and the inner wall of the cavity of the first slider; When the crank rotates in step S1, the upper end of the crank drives the connecting rod to extend through the second slider, and the connecting rod drives the limiting mechanism to slide along the cavity in the first slider to the position of the limiting through hole. At this time, the solenoid loses power, and the magnetic force between the solenoid and the strong magnetic sheet disappears. The first spring returns to its original state and then the limiting column passes through the limiting through hole and pushes into the limiting groove, and the limiting mechanism is connected to the movable clamping plate; The second slider drives the connecting rod to continue to extend, and the connecting rod moves toward the fixed clamping plate through the limiting mechanism and the movable clamping plate, clamping the hot forging blank on the fixed clamping plate, and then the hot forging blank is free forged by the forging hammer; S3. After the free forging is completed, the handle is rotated in reverse, the handle drives the worm to rotate, the worm wheel moves along the worm and drives the guide rod to extend from the guide sleeve, the guide rod drives the crank to rotate counterclockwise around the support seat through the second slider, the upper end of the crank drives the connecting rod through the second slider to drive the limit mechanism and the movable splint to move away from the fixed splint, and the movable splint is separated from the hot forging; At the same time, the second slider drives the elastic bag inner cavity to reduce its volume through the piston rod, and the gas stored in the elastic bag is ejected from the nozzle through the vent pipe. The ejected gas sweeps the forging scale on the working surface and blows the hot forging away from the clamping table, completing the free forging of the hot forging blank. S4, when the movable splint returns to the starting position, the solenoid is energized, the solenoid attracts the strong magnetic sheet and compresses the first spring through the limiting column, the limiting column is retracted from the limiting groove and the limiting through hole, and the connecting rod drives the limiting mechanism to return to the starting position along the cavity in the first slider; S5. Repeat the above steps S1 to S4 to clamp and free forge the next hot forging blank.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The present invention is specially used for clamping small hot forgings in the free forging process. When in use, the hot forging blank is placed on the working surface, and the crank is driven to rotate by rotating the handle forward, thereby pushing the movable clamp to move toward the fixed clamp to clamp the blank to be hot forged. At the same time, gas is sucked into the elastic bag to store gas; after the hot forging is completed, the handle is rotated in the reverse direction, and the crank is rotated in the reverse direction to drive the movable clamp to separate from the hot forging. At the same time, the gas stored in the elastic bag is ejected to blow away debris such as forging oxide scale and small hot forgings from the working surface, thereby improving the processing efficiency of small hot forgings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the front and cross-sectional view of the structure of the present invention; Figure 2 for Figure 1 A magnified schematic diagram of area A in the middle.

[0011] In the figure: 100, frame; 101, baffle; 200, working surface; 201, clamping table; 202, first slide; 203, second slide; 300, fixed splint; 301, movable splint; 302, limiting groove; 303, first slider; 304, limiting through hole; 400, solenoid; 401, first spring; 402, limiting column; 403, strong magnetic sheet; 404, fixed block; 500, second slider; 501, first sliding base; 502, connecting rod; 600, crank; 601, first rotating shaft; 602, second rotating shaft; 700, second slider; 701, second sliding base; 800, guide rod; 801, worm gear; 802, bearing seat; 803, worm; 900, piston rod; 901, elastic bag; 902, ventilation pipe; 903, nozzle. DETAILED DESCRIPTION

[0012] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] like Figure 1 and Figure 2 A hot forging clamping device shown in the figure comprises a frame 100, a fixed clamping plate 300, a movable clamping plate 301 and a purge mechanism, wherein: a baffle 101 is fixedly arranged on the right side of the frame 100 in the vertical direction, the purge mechanism comprises an elastic bag 901, a vent pipe 902 and a nozzle 903, the elastic bag 901 is arranged at the lower part of the baffle 101, an air inlet is arranged on the elastic bag 901, the nozzle 903 is arranged at the upper part of the baffle 101, and the air outlet of the elastic bag 901 is connected with the nozzle 903 through the vent pipe 902; The top surface of the frame 100 is set as a working surface 200, and a clamping platform 201 and a first sliding base 501 are fixedly arranged above the working surface 200. The center of the clamping platform 201 is provided with a first slide groove 202 in the horizontal direction, and a second slide groove 203 is provided on the top surface of the clamping platform 201; a first slider 303 is movably arranged in the first slide groove 202, a cavity is provided in the first slider 303 in the horizontal direction, and a limiting through hole 304 is provided on the top surface of the first slider 303; a fixed clamping plate 300 is fixedly arranged above the clamping platform 201, and the movable clamping plate 301 is arranged opposite to the fixed clamping plate 300, and the lower part of the movable clamping plate 301 is movably installed in the second slide groove 203 and slides along the second slide groove 203, and the lower end of the movable clamping plate 301 is recessed inward to provide a limiting groove 302; A second slider 500 is arranged in the horizontal direction in the first sliding base 501, and the second slider 500 is fixedly connected to the limiting mechanism through a connecting rod 502, and the limiting mechanism extends to the cavity in the first slider 303; the limiting mechanism includes a fixing block 404, and a through hole is arranged in the vertical direction. The first spring 401 is movably installed in the through hole, and the solenoid 400 is installed in the middle of the tube cavity of the first spring 401. Limiting columns 402 are respectively arranged at the head and tail ends of the first spring 401, and strong magnetic sheets 403 are respectively embedded on the opposite surfaces of the upper and lower limiting columns 402; in the initial state, the solenoid 400 is energized, the solenoid 400 attracts the strong magnetic sheet 403 and compresses the first spring 401 through the limiting columns 402. There is no friction between the spring 401, the limiting column 402 and the inner wall of the cavity of the first slider 303; when the second slider 500 drives the connecting rod 502 to extend, the connecting rod 502 drives the limiting mechanism to slide along the cavity in the first slider 303 to the position of the limiting through hole 304, at this time, the solenoid 400 loses power, the magnetic force between the solenoid 400 and the strong magnetic sheet 403 disappears, the first spring 401 restores its original state and then the limiting column 402 passes through the limiting through hole 304 and pushes into the limiting groove 302, and the limiting mechanism is connected to the movable clamping plate 301; the second slider 500 drives the connecting rod 502 to continue to extend, and the connecting rod 502 clamps the hot forging blank on the fixed clamping plate 300 through the limiting mechanism and the movable clamping plate 301; A handle is provided at the lower part of the left side of the frame 100, and the handle is provided in the horizontal direction. A guide sleeve is provided in the horizontal direction on the frame 100 below the handle. A second sliding base 701 is provided on the frame 100 inside the guide sleeve. A second slider 700 is provided in the horizontal direction in the second sliding base 701. One end of the guide rod 800 is installed in the guide sleeve, and the other end of the guide rod 800 is fixedly connected to the second slider 700. The tail end of the second slider 700, the lower end of the L-shaped crank 600 and one end of the piston rod 900 are hinged, and the other end of the piston rod 900 is connected to the side wall of the elastic bag 901. The guide rod 800 is driven by the second slider 700. The crank 600 rotates around the hinge position; a bearing seat 802 and a support seat are arranged above the second sliding base 701, the crank 600 is hinged to the support seat at the corner position through the first rotating shaft 601, the upper end of the crank 600 is hinged to the second sliding block 500 through the second rotating shaft 602, one end of the worm 803 is fixedly connected to the handle, and the other end of the worm 803 is installed in the bearing seat 802, and a worm wheel 801 is fixedly arranged above the middle of the guide rod 800, and the worm 803 cooperates with the worm wheel 801; the handle is manually turned to drive the worm 803 to rotate forward or reverse, and the worm wheel 801 drives the guide rod 800 to extend or retract from the guide sleeve.

[0014] Furthermore, the jetting direction of the nozzle 903 is aimed at the hot forging blank.

[0015] Furthermore, a one-way air outlet valve is provided at the air outlet of the elastic bag 901 .

[0016] Furthermore, the material of the fixed clamping plate 300 and the movable clamping plate 301 is hot working die steel.

[0017] A process for using the hot forging clamping device as described above comprises the following steps: S1. Place the hot forging blank in a heated state on the working surface 200, and then rotate the handle forward, the handle drives the worm 803 to rotate, the worm wheel 801 moves along the worm 803 and drives the guide rod 800 to retract into the guide sleeve, and the guide rod 800 drives the crank 600 to rotate clockwise around the support seat through the second slider 700; at the same time, the second slider 700 drives the volume of the inner cavity of the elastic bag 901 to increase through the piston rod 900, and the elastic bag 901 is inhaled; S2, in the initial state, the solenoid 400 is energized, the solenoid 400 attracts the strong magnetic sheet 403 and compresses the first spring 401 through the limiting column 402, and there is no friction between the limiting column 402 and the inner wall of the cavity of the first slider 303; When the crank 600 rotates in step S1, the upper end of the crank 600 drives the connecting rod 502 to extend through the second slider 500, and the connecting rod 502 drives the limiting mechanism to slide along the cavity in the first slider 303 to the position of the limiting through hole 304. At this time, the solenoid 400 loses power, and the magnetic force between the solenoid 400 and the strong magnetic sheet 403 disappears. The first spring 401 restores its original state and then the limiting column 402 passes through the limiting through hole 304 and pushes into the limiting groove 302, and the limiting mechanism is connected to the movable clamping plate 301; The second slider 500 drives the connecting rod 502 to continue to extend, and the connecting rod 502 moves toward the fixed clamping plate 300 through the limiting mechanism and the movable clamping plate 301, clamping the hot forging blank on the fixed clamping plate 300, and then the hot forging blank is free forged by the forging hammer; S3. After the free forging is completed, the handle is rotated in reverse, the handle drives the worm 803 to rotate, the worm wheel 801 moves along the worm 803 and drives the guide rod 800 to extend from the guide sleeve, the guide rod 800 drives the crank 600 to rotate counterclockwise around the support seat through the second slider 700, the upper end of the crank 600 drives the connecting rod 502 through the second slider 500 to drive the limit mechanism and the movable clamping plate 301 to move away from the fixed clamping plate 300, and the movable clamping plate 301 is separated from the hot forging; At the same time, the second slider 700 drives the elastic bag 901 to reduce its inner volume through the piston rod 900, and the gas stored in the elastic bag 901 is ejected from the nozzle 903 through the vent pipe 902. The ejected gas sweeps the forging scale on the working surface 200 and blows the hot forging away from the clamping table 201, completing the free forging of the hot forging blank. S4, when the movable clamping plate 301 returns to the starting position, the solenoid 400 is energized, the solenoid 400 attracts the strong magnetic sheet 403 and compresses the first spring 401 through the limiting column 402, the limiting column 402 is withdrawn from the limiting groove 302 and the limiting through hole 304, and the connecting rod 502 drives the limiting mechanism to return to the starting position along the cavity in the first slider 303; S5. Repeat the above steps S1 to S4 to clamp and free forge the next hot forging blank.

[0018] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hot forging clamping device, comprising a frame (100), a fixed clamping plate (300), a movable clamping plate (301) and a purge mechanism, characterized in that: A baffle (101) is fixedly arranged on the right side of the frame (100) in the vertical direction, the purging mechanism comprises an elastic bag (901), a vent pipe (902) and a nozzle (903), the elastic bag (901) is arranged at the bottom of the baffle (101), an air inlet is arranged on the elastic bag (901), the nozzle (903) is arranged at the top of the baffle (101), and the air outlet of the elastic bag (901) is connected to the nozzle (903) through the vent pipe (902); The top surface of the frame (100) is set as a working surface (200), a clamping platform (201) and a first sliding base (501) are fixedly arranged above the working surface (200), a first slide groove (202) is arranged in the center of the clamping platform (201) along the horizontal direction, and a second slide groove (203) is arranged on the top surface of the clamping platform (201); a first sliding block (303) is movably arranged in the first slide groove (202), a cavity is arranged in the first sliding block (303) along the horizontal direction, and a limiting through hole (304) is arranged on the top surface of the first sliding block (303); a fixed clamping plate (300) is fixedly arranged above the clamping platform (201), the movable clamping plate (301) is arranged opposite to the fixed clamping plate (300), the lower part of the movable clamping plate (301) is movably installed in the second slide groove (203) and slides along the second slide groove (203), and the lower end of the movable clamping plate (301) is recessed inward to set a limiting groove (302); A second sliding block (500) is arranged in the horizontal direction in the first sliding base (501), and the second sliding block (500) is fixedly connected to the limiting mechanism through a connecting rod (502), and the limiting mechanism extends into the cavity in the first sliding block (303); the limiting mechanism comprises a fixing block (404), and a through hole is arranged in the vertical direction of the fixing block (404), and the first spring (401) is movably installed in the through hole, and the solenoid (400) is installed in the middle of the tube cavity of the first spring (401), and limiting columns (402) are respectively arranged at the head and tail ends of the first spring (401), and strong magnetic sheets (403) are respectively embedded in the opposite surfaces of the upper and lower limiting columns (402); in the initial state, the solenoid (400) is energized, and the solenoid (400) attracts the strong magnetic sheet (403) and compresses the first spring through the limiting column (402). (401), there is no friction force between the limiting column (402) and the inner wall of the cavity of the first slider (303); when the second slider (500) drives the connecting rod (502) to extend, the connecting rod (502) drives the limiting mechanism to slide along the cavity in the first slider (303) to the position of the limiting through hole (304), at which time the solenoid (400) loses power, the magnetic force between the solenoid (400) and the strong magnetic sheet (403) disappears, the first spring (401) returns to its original state, and then the limiting column (402) passes through the limiting through hole (304) and pushes into the limiting groove (302), and the limiting mechanism is connected to the movable clamping plate (301); the second slider (500) drives the connecting rod (502) to continue to extend, and the connecting rod (502) clamps the hot forging blank on the fixed clamping plate (300) through the limiting mechanism and the movable clamping plate (301); A handle is provided at the lower part of the left side of the frame (100), and the handle is provided in the horizontal direction. A guide sleeve is provided on the frame (100) below the handle in the horizontal direction. A second sliding base (701) is provided on the frame (100) inside the guide sleeve. A second sliding block (700) is provided in the second sliding base (701) in the horizontal direction. One end of the guide rod (800) is installed in the guide sleeve. The other end of the guide rod (800) is fixedly connected to the second sliding block (700). The tail end of the second sliding block (700), the lower end of the L-shaped crank (600) and one end of the piston rod (900) are hinged. The other end of the piston rod (900) is connected to the side wall of the elastic bag (901). The guide rod (800) drives the crank through the second sliding block (700). (600) rotates around the hinged position; a bearing seat (802) and a support seat are arranged above the second sliding base (701); the crank (600) is hinged to the support seat at a corner position through a first rotating shaft (601); the upper end of the crank (600) is hinged to the second sliding block (500) through a second rotating shaft (602); one end of the worm (803) is fixedly connected to the handle; the other end of the worm (803) is installed in the bearing seat (802); a worm wheel (801) is fixedly arranged above the middle of the guide rod (800); the worm (803) and the worm wheel (801) cooperate; the handle is manually turned to drive the worm (803) to rotate forward or reverse, and the worm wheel (801) drives the guide rod (800) to extend or retract from the guide sleeve.

2. A hot forging clamping device according to claim 1, characterized in that: The jetting direction of the nozzle (903) is aimed at the hot forging blank.

3. A hot forging clamping device according to claim 1, characterized in that: A one-way air outlet valve is provided at the air outlet position of the elastic bag (901).

4. A hot forging clamping device according to claim 1, characterized in that: The fixed clamping plate (300) and the movable clamping plate (301) are made of hot working die steel.

5. A process for using the hot forging clamping device as claimed in claim 1, characterized in that: The following steps are involved: S1. Place the hot forging blank in a heated state on the working surface (200), then rotate the handle forward, the handle drives the worm (803) to rotate, the worm wheel (801) moves along the worm (803) and drives the guide rod (800) to retract into the guide sleeve, and the guide rod (800) drives the crank (600) to rotate clockwise around the support seat through the second slider (700); at the same time, the second slider (700) drives the volume of the inner cavity of the elastic bag (901) to increase through the piston rod (900), and air is sucked into the elastic bag (901); S2, in the initial state, the solenoid (400) is energized, the solenoid (400) attracts the strong magnetic sheet (403) and compresses the first spring (401) through the limiting column (402), and there is no friction force between the limiting column (402) and the inner wall of the cavity of the first slider (303); When the crank (600) rotates in step S1, the upper end of the crank (600) drives the connecting rod (502) to extend through the second slider (500), and the connecting rod (502) drives the limiting mechanism to slide along the cavity in the first slider (303) to the position of the limiting through hole (304). At this time, the solenoid (400) loses power, and the magnetic force between the solenoid (400) and the strong magnetic sheet (403) disappears. The first spring (401) returns to its original state and then the limiting column (402) passes through the limiting through hole (304) and pushes it into the limiting groove (302). The limiting mechanism is connected to the movable clamping plate (301); The second slider (500) drives the connecting rod (502) to continue to extend, and the connecting rod (502) moves toward the side of the fixed clamping plate (300) through the limiting mechanism and the movable clamping plate (301), clamping the hot forging blank on the fixed clamping plate (300), and then free forging the hot forging blank is performed by a forging hammer; S3. After the free forging is completed, the handle is rotated in the reverse direction, the handle drives the worm (803) to rotate, the worm wheel (801) moves along the worm (803) and drives the guide rod (800) to extend out of the guide sleeve, the guide rod (800) drives the crank (600) to rotate counterclockwise around the support seat through the second slider (700), the upper end of the crank (600) drives the connecting rod (502) through the second slider (500) to drive the limit mechanism and the movable splint (301) to move to the side away from the fixed splint (300), and the movable splint (301) is separated from the hot forging; At the same time, the second slider (700) drives the volume of the inner cavity of the elastic bag (901) to decrease through the piston rod (900), and the gas stored in the elastic bag (901) is ejected from the nozzle (903) through the vent pipe (902), and the ejected gas blows away the forging scale on the working surface (200) and blows the hot forging away from the clamping table (201), thereby completing the free forging of the hot forging blank; S4, when the movable clamping plate (301) returns to the starting position, the solenoid (400) is energized, the solenoid (400) attracts the strong magnetic sheet (403) and compresses the first spring (401) through the limiting column (402), the limiting column (402) is retracted from the limiting groove (302) and the limiting through hole (304), and the connecting rod (502) drives the limiting mechanism to return to the starting position along the cavity in the first slider (303); S5. Repeat the above steps S1 to S4 to clamp and free forge the next hot forging blank.

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