Forging equipment and processing technology for automobile steering knuckle processing

Abstract

The invention relates to the technical field of steering knuckle forging equipment, and discloses a forging equipment for automobile steering knuckle processing, comprising a bottom plate and a sealing plate, wherein a base is fixedly installed at the center of the upper surface of the bottom plate. Through the arrangement of a small fork ear side pressure plate, a large fork ear side pressure plate and a forging head, after the bottom end of a high-temperature molten alloy block is inserted into a rod forming hole, the alloy block is forged by the small fork ear side pressure plate, the large fork ear side pressure plate and the forging head at the same time. In this process, the rod forming hole, the limiting annular plate, the small fork ear side pressure plate, the large fork ear side pressure plate and the forging head completely wrap the alloy block, and then forge it. On the one hand, the alloy block is reduced from contacting with the outside air during the deformation process, and the oxide is prevented from being squeezed into the steering knuckle during the forging process, thereby improving the quality of the steering knuckle. On the other hand, the steering knuckle can be integrally formed, effectively ensuring the rapid forming of the large fork ear and the small fork ear of the steering knuckle.

Description

Technical Field

[0001] The invention relates to the technical field of steering knuckle forging equipment, in particular to a forging equipment and a processing technology for processing an automobile steering knuckle. Background Art

[0002] The steering knuckle, also known as the "ram's horn", is one of the important parts of the automobile steering axle. It can make the car run stably and sensitively transmit the driving direction. The function of the steering knuckle is to transmit and bear the front load of the car, support and drive the front wheel to rotate around the kingpin to turn the car. When the car is driving, it is subjected to variable impact loads. Therefore, it is required to have high strength. Therefore, it is processed and produced by forging equipment to increase its strength. However, in the production process of some automobile steering knuckles, there are some deficiencies in forging equipment, as follows:

[0003] In patent document CN101811170A, refer to the appendix of its specification Figure 1 , an integral automobile steering yoke, which is formed into a whole by a rod 1, a flange 2, a large fork ear 5 and a small fork ear 4 provided on the flange 2, wherein the inner opening surface of the large fork ear 5 has a negative angle of 8 degrees with the center line of the rod, and the outer opening surface of the small fork ear 4 has a negative angle of 8 degrees with the center line of the rod. At present, during forging, a high-temperature softened alloy is placed in a mold through multiple molds, and is struck by a hammer to gradually form it in the multiple molds. However, due to the negative angle of the above-mentioned steering knuckle, the hammer generally moves in a straight line during forging. Therefore, during forging, the negative angle of the steering knuckle cannot be shaped and forged, and subsequent cutting processing is required. In order to fully form the steering knuckle during forging, the amount of high-temperature softened alloy is greater than the amount after the steering knuckle is formed. During forging, after the steering knuckle is formed, the remaining high-temperature softened alloy residue is large, and the flash is large, which needs to be cut off during the blanking process. The process is very cumbersome and the raw material utilization rate is low. Summary of the invention

[0004] The invention provides a forging device for processing an automobile steering knuckle, which has the advantages of integrated forging and low investment in forging equipment, and solves the problems in the above-mentioned background technology.

[0005] The present invention provides the following technical scheme: a forging equipment for processing an automobile steering knuckle, comprising a base plate and a sealing plate, a base is fixedly installed at the center of the upper surface of the base plate, a rod forming hole is opened inside the base, a limiting annular plate is movably sleeved inside the base, a limiting support seat is movably installed on the upper surface of the base, the limiting support seat is movably sleeved with the limiting annular plate, a small fork ear side pressure plate and a large fork ear side pressure plate are movably installed on the left and right sides of the limiting support seat, a support frame is fixedly installed on the upper surface of the base plate and located on the outside of the base, a forging telescopic rod is fixedly installed on the inner top of the support frame and directly above the limiting annular plate, a forging head is fixedly installed on the bottom end of the extended end of the forging telescopic rod, a large fork ear forming plate is movably installed on the side of the forging head close to the small fork ear side pressure plate through a movable shaft, a hydraulic push device is movably installed inside the forging head through a movable shaft, and the extended end of the hydraulic push device is movably hinged to the bottom of the large fork ear forming plate.

[0006] Preferably, grooves are evenly opened inside the base and below the limiting annular plate, a lifting and telescopic rod is fixedly installed in the groove, the protruding end of the lifting and telescopic rod is fixedly connected to the bottom surface of the limiting annular plate, a support spring is movably sleeved on the lifting and telescopic rod, and both ends of the support spring are fixedly connected to the limiting annular plate and the base respectively.

[0007] Preferably, a push rod is movably installed on both sides of the support frame, and one end of the two push rods is fixedly connected to the right side of the small fork ear side pressure plate and the left side of the large fork ear side pressure plate respectively; a shock-absorbing spring is symmetrically and movably sleeved on the push rod and located on the outside of the support frame; a pulley is movably sleeved on the end of the push rod and located on the outside of the support frame; a limiting wheel is movably installed on the outer side of the support frame and above the push rod; a guide wheel is movably installed on the top of the support frame; a steel wire rope is fixedly connected on the support frame and located below the push rod, and the other end of the steel wire rope is fixedly connected to the upper surface of the forging head after passing through the pulley, the limiting wheel and the guide wheel in sequence.

[0008] Preferably, the inner side surface of the large fork ear side pressure plate is parallel to the left side surface of the forging head, and both form an angle of 8 degrees with the center line of the rod forming hole, and the inner side surface of the small fork ear side pressure plate forms an angle of 8 degrees with the center line of the rod forming hole.

[0009] Preferably, the height difference between the upper surface of the limiting annular plate and the upper surface of the base is the same as the thickness of the steering knuckle.

[0010] The present invention has the following beneficial effects:

[0011] 1. Through the arrangement of the small fork ear side pressure plate, the large fork ear side pressure plate and the forging head, after the bottom end of the high-temperature molten alloy block is inserted into the rod forming hole, the alloy block is forged by the small fork ear side pressure plate, the large fork ear side pressure plate and the forging head at the same time. In this process, the rod forming hole, the limiting annular plate, the small fork ear side pressure plate, the large fork ear side pressure plate and the forging head completely wrap the alloy block, and then forge it. On the one hand, the contact between the alloy block and the outside air during the deformation process is reduced, and the oxide is prevented from being squeezed into the steering knuckle during the forging process, thereby improving the quality of the steering knuckle. On the other hand, the steering knuckle can be integrally formed, effectively ensuring the rapid forming of the large fork ear and the small fork ear of the steering knuckle.

[0012] 2. Through the setting of the limiting annular plate, the forging process of the steering knuckle can be divided into two parts. First, the alloy block is wrapped by the limiting annular plate, and the rod and flange of the steering knuckle are initially formed by forging with the forging head. Then, through the setting of the steel wire rope, the forging head and the small fork ear side pressure plate and the large fork ear side pressure plate are synchronously forged again for the initial forming. This time, the large fork ear and the small fork ear of the steering knuckle are forged and formed, and at the same time, the excess alloy is squeezed to various parts of the steering knuckle, which ensures the utilization rate of the alloy block and strengthens the structural strength of various parts of the steering knuckle. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 It is a partial cross-sectional schematic diagram of the overall structure of the present invention;

[0015] Figure 3 It is a partial cross-sectional schematic diagram of the structure of the present invention;

[0016] Figure 4 It is a front view half-section schematic diagram of the structure of the present invention;

[0017] Figure 5 It is a top view schematic diagram of the structure of the present invention;

[0018] Figure 6 It is a side view schematic diagram of the small fork ear side pressure plate of the structure of the present invention;

[0019] Figure 7 It is a schematic side view of the large fork ear side pressure plate of the structure of the present invention;

[0020] Figure 8 It is a left side schematic diagram of the forging head of the structure of the present invention;

[0021] Fig. 9 It is a schematic diagram of the right side view of the forging head of the structure of the present invention.

[0022] In the figure: 1. bottom plate; 2. base; 3. rod forming hole; 4. limiting annular plate; 5. lifting telescopic rod; 6. support spring; 7. limiting support seat; 8. small fork ear side pressure plate; 9. large fork ear side pressure plate; 10. support frame; 11. forged telescopic rod; 12. forging head; 13. large fork ear forming plate; 14. hydraulic push device; 15. push rod; 16. shock-absorbing spring; 17. pulley; 18. limiting wheel; 19. guide wheel; 20. wire rope. DETAILED DESCRIPTION

[0023] 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.

[0024] See also Figure 1-Figure 5A forging device for processing an automobile steering knuckle comprises a bottom plate 1, a base 2 is fixedly installed at the center of the upper surface of the bottom plate 1, a rod forming hole 3 is opened inside the base 2, a limited annular plate 4 is movably sleeved inside the base 2, a limited support seat 7 is movably installed on the upper surface of the base 2, the limited support seat 7 is movably sleeved with the limited annular plate 4, a small fork ear side pressure plate 8 and a large fork ear side pressure plate 9 are movably installed on the left and right of the limited support seat 7, a support frame 10 is fixedly installed on the upper surface of the bottom plate 1 and located on the outside of the base 2, a forging telescopic rod 11 is fixedly installed on the inner top of the support frame 10 and located directly above the limited annular plate 4, and the bottom end of the extended end of the forging telescopic rod 11 is fixed A forging head 12 is installed, and a large fork ear forming plate 13 is movably installed on one side of the forging head 12 close to the small fork ear side pressure plate 8 through a movable shaft. A hydraulic push device 14 is movably installed inside the forging head 12 through a movable shaft. The extended end of the hydraulic push device 14 is movably hinged with the bottom of the large fork ear forming plate 13, and the bottom end of the high-temperature molten alloy block is inserted into the rod forming hole 3, and then the small fork ear side pressure plate 8 and the large fork ear side pressure plate 9 are pushed at the same time, and the forging head 12 is pushed down by the forging telescopic rod 11 to press the alloy block. When the small fork ear side pressure plate 8 and the large fork ear side pressure plate 9 hit the alloy block, the alloy block is forged toward the middle, and the side of the alloy block is pressed at the same time. The forging head 12 is used to shape the alloy block. With the forging of the forging head 12, the excess alloy block between the small fork ear side pressure plate 8 and the large fork ear side pressure plate 9 is squeezed downward and pressed into the rod forming hole 3 to form the rod of the steering knuckle. At the same time, under the constraint of the limiting annular plate 4, the middle flange of the steering knuckle is formed. In this way, the rod, flange and small fork ear of the steering knuckle are completed at the same time. Subsequently, when the forging head 12 is inserted between the small fork ear side pressure plate 8 and the large fork ear side pressure plate 9, hydraulic oil is injected into the hydraulic pushing device 14. The hydraulic pushing device 14 pushes the bottom of the large fork ear forming plate 13, so that the large fork ear forming plate 13 rotates, and the opening surface of the large fork ear is forged to complete the opening of the large fork ear. The surface forms an angle of 8 degrees with the center line of the rod. After the forging is completed, the hydraulic push device 14 pulls back the large fork ear forming plate 13, and then pulls back the small fork ear side pressure plate 8, the large fork ear side pressure plate 9 and the forging head 12. In this process, the rod forming hole 3, the limiting annular plate 4, the small fork ear side pressure plate 8, the large fork ear side pressure plate 9 and the forging head 12 completely wrap the alloy block, and then forge it. On the one hand, it reduces the contact of the alloy block with the outside air during the deformation process, prevents the oxide from being squeezed into the steering knuckle during the forging process, and improves the quality of the steering knuckle. On the other hand, it can make the steering knuckle integrally formed, effectively ensuring the rapid forming of the large fork ear and the small fork ear of the steering knuckle;Grooves are evenly arranged inside the base 2 and below the limiting annular plate 4, in which a lifting and telescopic rod 5 is fixedly installed, and the protruding end of the lifting and telescopic rod 5 is fixedly connected to the bottom surface of the limiting annular plate 4, and a supporting spring 6 is movably sleeved on the lifting and telescopic rod 5, and the two ends of the supporting spring 6 are respectively fixedly connected to the limiting annular plate 4 and the base 2. The steering knuckle forging process can be divided into two parts. First, the limiting annular plate 4 is pushed up and raised by the lifting and telescopic rod 5, and the alloy block is wrapped in the inside of the limiting annular plate 4, and then a sealing plate is covered on the top of the limiting annular plate 4, and then the forging head 12 descends to press the sealing plate, and the sealing plate forges the alloy block. At this time, the alloy block is in the limiting position. Under the constraint of the annular plate 4, a part of the alloy enters the rod forming hole 3 to form the rod of the steering knuckle, and then the remaining alloy forms the shape of a flange in the limiting annular plate 4. At this time, the upper surface height of the flange is the same as the upper surface height of the large fork ear. Then the sealing plate is removed, and the lifting and telescopic rod 5 drives the limiting annular plate 4 to descend. The flange with excessive thickness in the limiting annular plate 4 is forged by the small fork ear side pressure plate 8, the large fork ear side pressure plate 9 and the forging head 12 respectively to form a large fork ear and a small fork ear. The alloy block is forged multiple times to gradually form a steering knuckle. In this process, through multiple forgings, the excess alloy is pressed into various parts of the steering knuckle respectively to strengthen each part. The tightness of the alloy is enhanced to strengthen the structural strength of the steering knuckle; push rods 15 are movably installed on both sides of the support frame 10, and one end of the two push rods 15 is fixedly connected to the right side of the small fork ear side pressure plate 8 and the left side of the large fork ear side pressure plate 9 respectively, and a shock absorbing spring 16 is symmetrically movably sleeved on the push rod 15 and located on the outside of the support frame 10, and a pulley 17 is movably sleeved on the end of the push rod 15 and located on the outside of the support frame 10, and a limited wheel 18 is movably installed on the outer side of the support frame 10 and located above the push rod 15, and a guide wheel 19 is movably installed on the top of the support frame 10, and a steel wire rope 20 is fixedly connected to the support frame 10 and located below the push rod 15, and the other end of the steel wire rope 20 is fixedly connected to the support frame 10. After passing through the travel pulley 17, the limit wheel 18 and the guide wheel 19, they are fixedly connected to the upper surface of the forging head 12. When the forging head 12 descends, the wire rope 20 is pulled and the limit wheel 18 is used to limit the pulley 17. The wire rope 20 drives the pulley 17 to approach the support frame 10, and then the push rod 15 is used to push the small fork ear side pressure plate 8, so that the small fork ear side pressure plate 8 impacts the alloy block to complete the forging. In the process of forging the large fork ear and the small fork ear of the steering knuckle, forging is performed simultaneously from three directions, so that the excess parts of the alloy block can be dispersed and extruded to various parts of the steering knuckle, ensuring that each part of the steering knuckle has sufficient strength, thereby extending its service life.

[0025] See also Figure 6-Figure 9The inner side surface of the large fork ear side pressure plate 9 is parallel to the left side surface of the forging head 12, and both are at an angle of 8 degrees with the center line of the rod forming hole 3. The inner side surface of the small fork ear side pressure plate 8 is at an angle of 8 degrees with the center line of the rod forming hole 3. The small fork ear can be directly formed by forging the large fork ear side pressure plate 9 and the hydraulic push device 14, while the small fork ear side pressure plate 8 and the forging head 12 can form the outer side surface of the large fork ear; the height difference between the upper surface of the limiting annular plate 4 and the upper surface of the base 2 is the same as the thickness of the steering knuckle;

[0026] Working principle: first, heat the alloy block at high temperature, and forge the bottom end of the alloy block into a cone shape, then insert it into the rod forming hole 3, and push the limiting annular plate 4 up through the lifting and telescopic rod 5 to wrap the alloy block inside the limiting annular plate 4. If the height of the alloy block exceeds the upper surface of the limiting annular plate 4, the forging head 12 is used to forge the alloy block for the first time, and the upper surface of the alloy block is pressed down so that the upper surface of the alloy block is flush with the upper surface of the limiting annular plate 4, and then a sealing plate is covered on the upper side of the limiting annular plate 4, and then the forging head 12 is lowered to press the sealing plate. The sealing plate forges the alloy block. At this time, under the constraint of the limiting annular plate 4, a part of the alloy enters the rod forming hole 3 to form the rod of the steering knuckle. Then the remaining alloy forms a flange shape in the limiting annular plate 4. At this time, the upper surface height of the flange is the same as the upper surface height of the large fork ear. In order to ensure that the upper part of the alloy block forms the shape of a flange, the limiting annular plate 4 will drop a part at this time. After the drop, the upper surface of the limiting annular plate 4 is flush with the highest point of the large fork ear. Remove the sealing plate, and the lifting and telescopic rod 5 drives the limiting annular plate 4 to drop. Then the forging head After the forging head 12 rises, it descends at a certain speed. When the forging head 12 descends, the wire rope 20 pulls and the limiting action of the limiting wheel 18 causes the wire rope 20 to drive the pulley 17 to approach the support frame 10, and then the small fork ear side pressure plate 8 and the large fork ear side pressure plate 9 are driven by the push rod 15 to forge the alloy block. When the small fork ear side pressure plate 8 and the large fork ear side pressure plate 9 hit the alloy block, the alloy block is forged toward the middle and the side of the alloy block is shaped at the same time. With the forging of the forging head 12, the excess alloy block between the small fork ear side pressure plate 8 and the large fork ear side pressure plate 9 is pushed to the Pressurize each part to strengthen the strength of each part. When the forging head 12 is inserted between the small fork ear side pressure plate 8 and the large fork ear side pressure plate 9, hydraulic oil is injected into the hydraulic pushing device 14. The hydraulic pushing device 14 pushes the bottom of the large fork ear forming plate 13 to rotate the large fork ear forming plate 13, and forges the opening surface of the large fork ear to form an angle of 8 degrees between the opening surface of the large fork ear and the center line of the rod. After the forging is completed, the hydraulic pushing device 14 pulls back the large fork ear forming plate 13, and then pulls back the small fork ear side pressure plate 8, the large fork ear side pressure plate 9 and the forging head 12.

[0027] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0028] 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 forging device for processing an automobile steering knuckle, comprising a base plate (1) and a sealing plate, characterized in that: A base (2) is fixedly mounted at the center of the upper surface of the bottom plate (1), a rod forming hole (3) is opened inside the base (2), a limited annular plate (4) is movably sleeved inside the base (2), a limited support seat (7) is movably mounted on the upper surface of the base (2), the limited support seat (7) is movably sleeved with the limited annular plate (4), a small fork ear side pressure plate (8) and a large fork ear side pressure plate (9) are movably mounted on the left and right of the limited support seat (7), respectively, a support frame (1) is fixedly mounted on the upper surface of the bottom plate (1) and located outside the base (2) 0), a forged telescopic rod (11) is fixedly mounted on the inner top of the support frame (10) and directly above the limiting annular plate (4), a forging head (12) is fixedly mounted on the bottom end of the extended end of the forged telescopic rod (11), a large fork ear forming plate (13) is movably mounted on the side of the forging head (12) close to the small fork ear side pressure plate (8) via a movable shaft, a hydraulic push device (14) is movably mounted inside the forging head (12) via a movable shaft, and the extended end of the hydraulic push device (14) is movably hinged to the bottom of the large fork ear forming plate (13).

2. The forging equipment for automobile steering knuckle processing according to claim 1 is characterized in that: Grooves are evenly arranged inside the base (2) and below the limiting annular plate (4), a lifting and telescopic rod (5) is fixedly installed in the groove, the protruding end of the lifting and telescopic rod (5) is fixedly connected to the bottom surface of the limiting annular plate (4), a support spring (6) is movably sleeved on the lifting and telescopic rod (5), and the two ends of the support spring (6) are respectively fixedly connected to the limiting annular plate (4) and the base (2).

3. The forging equipment for automobile steering knuckle processing according to claim 2 is characterized in that: Push rods (15) are movably mounted on both sides of the support frame (10), one end of each of the two push rods (15) is fixedly connected to the right side of the small fork ear side pressure plate (8) and the left side of the large fork ear side pressure plate (9), respectively; a damping spring (16) is symmetrically and movably sleeved on the push rods (15) and located outside the support frame (10); a pulley (17) is movably sleeved on the end of the push rod (15) and located outside the support frame (10); a limiting wheel (18) is movably mounted on the outer side surface of the support frame (10) and located above the push rods (15); a guide wheel (19) is movably mounted on the top of the support frame (10); a steel wire rope (20) is fixedly connected on the support frame (10) and located below the push rods (15); the other end of the steel wire rope (20) passes through the pulley (17), the limiting wheel (18) and the guide wheel (19) in sequence and is fixedly connected to the upper surface of the forging head (12).

4. The forging equipment for automobile steering knuckle processing according to claim 1, characterized in that: The inner side surface of the large fork ear side pressure plate (9) is parallel to the left side surface of the forging head (12), and both form an angle of 8 degrees with the center line of the rod forming hole (3), and the inner side surface of the small fork ear side pressure plate (8) forms an angle of 8 degrees with the center line of the rod forming hole (3).

5. The forging equipment for automobile steering knuckle processing according to claim 1 is characterized in that: The height difference between the upper surface of the limiting annular plate (4) and the upper surface of the base (2) is the same as the thickness of the steering knuckle.

6. A processing technology using the forging equipment for automobile steering knuckle processing according to claim 3, wherein the steps are as follows: S1: firstly, the alloy block is heated to a high temperature, and the bottom end of the alloy block is forged into a conical shape, and then the alloy block is inserted into the rod forming hole (3); S2: The limiting annular plate (4) is pushed up and raised by the lifting and telescopic rod (5), and the alloy block is wrapped inside the limiting annular plate (4). If the height of the alloy block exceeds the upper surface of the limiting annular plate (4), the alloy block is forged for the first time by using the forging head (12) to press the upper surface of the alloy block downward so that the upper surface of the alloy block is flush with the upper surface of the limiting annular plate (4). Then, a sealing plate is covered on the upper side of the limiting annular plate (4), and then the forging head (12) is lowered to press the sealing plate. The sealing plate forges the alloy block. At this time, under the constraint of the limiting annular plate (4), a portion of the alloy enters the rod forming hole (3) to form the rod of the steering knuckle. Subsequently, the remaining alloy forms a flange shape in the limiting annular plate (4). At this time, the height of the upper surface of the flange is the same as the height of the upper surface of the large fork ear. In order to ensure that the upper part of the alloy block forms the shape of the flange, the limiting annular plate (4) will be partially lowered. After the lowering, the upper surface of the limiting annular plate (4) is flush with the highest point of the large fork ear. S3: The sealing plate is removed, and the lifting telescopic rod (5) drives the limiting annular plate (4) to descend, and then the forging head (12) rises and then descends at a certain speed. When the forging head (12) descends, the steel wire rope (20) is pulled and the limiting action of the limiting wheel (18) causes the steel wire rope (20) to drive the pulley (17) to approach the support frame (10), and then the small fork ear side pressure plate (8) and the large fork ear side pressure plate (9) are driven by the push rod (15) to forge the alloy block. When the small fork ear side pressure plate (8) and the large fork ear side pressure plate (9) hit the alloy block, the alloy block is forged toward the middle and the side of the alloy block is shaped at the same time. As the forging head (12) is forged, the excess alloy block between the small fork ear side pressure plate (8) and the large fork ear side pressure plate (9) is pressurized to various places, thereby strengthening the strength of various parts; S4: After the forging head (12) is inserted between the small fork ear side pressure plate (8) and the large fork ear side pressure plate (9), hydraulic oil is injected into the hydraulic push device (14), and the hydraulic push device (14) pushes the bottom of the large fork ear forming plate (13), so that the large fork ear forming plate (13) rotates, and the opening surface of the large fork ear is forged, and the opening surface of the large fork ear is formed at an angle of 8 degrees with the center line of the rod. After the forging is completed, the hydraulic push device (14) pulls back the large fork ear forming plate (13), and then the small fork ear side pressure plate (8), the large fork ear side pressure plate (9) and the forging head (12) are pulled back.

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