Hoop pressing forming device and pressing method

Abstract

The invention discloses a hoop pressing forming device which comprises a hydraulic oil cylinder, an upper die frame, a hoop batten, a pressing die, a positioning rod, a lower die base, a shape correcting die, a connecting bolt and a gantry frame lower portion operation platform. The upper die frame comprises a connecting plate, a rib plate, a threaded support plate and a support plate with holes, a long-strip-shaped space is formed between the threaded support plate and the support plate with the holes, the free end of the hoop batten can penetrate through the long-strip-shaped space in a barrier-free mode conveniently when the hoop batten is pressed or shaped, and the lower die base is fixed to an operation platform on the lower portion of the gantry frame. The lower die base comprises a positioning plate, a lower die block, a die base bottom plate and a limiting plate. The hoop pressing and correcting device is reasonable in structural design, automatic pressing and correcting of hoops can be achieved, it is guaranteed that the hoop pressing quality is stable, and it is guaranteed that the size precision meets the design requirement.

Description

Technical Field

[0001] The invention relates to the technical field of processing and manufacturing clamps for liquid tank trucks and powder tank trucks, and in particular to a clamp pressing and forming device and a pressing method. Background Art

[0002] The diversification of logistics and transportation in today's society has promoted the vigorous development of various special vehicles. Liquid tank trucks that carry liquid materials and powder tank trucks that carry powder and granular materials have also taken this opportunity to emerge in a blowout manner with a wide range of models with strong adaptability, enriching market demand. In order to facilitate the rapid loading and unloading of materials in these tank trucks, the hose box and hose on the vehicle have become their standard configuration. Although there are many ways to fix the hose box, most tank trucks usually use a clamp to clamp the hose box, which is simple and lightweight, and can effectively reduce the curb weight of the tank truck.

[0003] The clamp is generally made of stainless steel 2B plate, with a thickness of about 3mm and a width of about 30mm. The number of clamps for each hose box is strictly configured according to the design requirements. When clamping the hose box, the clamp must be close to the outer wall of the hose box. On the one hand, this prevents the hose box from loosening and slipping during vehicle driving, thereby damaging the outer wall of the hose box, and also poses a safety hazard; on the other hand, the two are as close as possible, increasing the contact area, avoiding deformation of the hose box due to uneven local force during the clamping process, affecting its appearance. Therefore, it is extremely important to strictly control the production quality of the clamp.

[0004] The quality of the clamp is mainly reflected in the following aspects: first, the roundness of the clamp must meet the design requirements; second, the bending angles and lengths of the bending sections at both ends of the clamp must meet the design requirements; third, the clamp must not be twisted, and ensure that its flatness when placed horizontally meets the corresponding standard requirements (such as standard GB / T19804-2005 "General dimensional tolerances and form and position tolerances of welded structures"); fourth, the outer surface color of the stainless steel clamp must be guaranteed, and no damage or scratches must occur.

[0005] In the prior art, the clamp is bent into shape by the manual pipe bending principle, which is prone to large rebound after bending, the roundness does not meet the design requirements, and the bending angles of the bending sections at both ends of the clamp are difficult to control; the clamp is first rolled into a round shape by a plate rolling machine, and then the two ends of the clamp are bent. The clamp is prone to distortion and is difficult to correct to its flatness meeting the design requirements. For this reason, we propose a clamp pressing and forming device and a pressing method to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the problems existing in the prior art, and to propose a clamp pressing and forming device and a pressing method, which can realize automatic pressing and correction of the clamp, ensure the stable pressing quality of the clamp, and ensure that the dimensional accuracy meets the design requirements.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A clamp pressing and forming device comprises a hydraulic cylinder, an upper die frame, a clamp strip, a pressing die, a positioning rod, a lower die seat, a shaping die, connecting bolts and a lower working platform of a gantry frame, wherein the upper die frame is fixed to the piston rod flange of the hydraulic cylinder by fixing bolts, and the upper die frame comprises a connecting plate, a rib plate, a threaded bracket plate and a bracket plate with holes, and a long strip space is formed between the threaded bracket plate and the bracket plate with holes so that the free end of the clamp strip can pass through the space without obstacles when pressing or shaping;

[0009] The lower die base is fixed on the lower working platform of the gantry frame, and the lower die base includes a positioning plate, a lower die block, a die base bottom plate, and a limit plate;

[0010] The pressing die is used to press the hoop strips, the shaping die is used to shape the hoop that does not meet the design drawing requirements after pressing, and the connecting bolts are used to fix the pressing die or the shaping die on the upper die frame;

[0011] Bolt holes are provided at both ends of the hoop strip.

[0012] Preferably, a threaded hole is formed on the connecting plate, and the connecting plate is connected to the piston rod flange of the hydraulic cylinder via fixing bolts.

[0013] Preferably, a threaded hole adapted to the connecting bolt is formed through the threaded bracket plate, and a mounting hole adapted to the connecting bolt is formed through the perforated bracket plate, and the threaded hole and the mounting hole are located on the same horizontal line.

[0014] Preferably, the lower die seat is locked on the lower working platform of the gantry frame through a dedicated pressing plate.

[0015] Preferably, the upper ends of the pressing die and the shaping die are provided with through holes for connecting bolts to pass through to connect them to the upper die frame, and the bosses on both sides of the pressing die and the shaping die are directly in contact with the bottom of the upper die frame.

[0016] Preferably, the upper sides of the inner side walls at both ends of the lower module are formed with slope surfaces, a first positioning hole is provided on the right side of the upper end of the lower module, and a positioning groove is provided on the left side of the upper end of the lower module.

[0017] Preferably, a second positioning hole located on the same vertical line as the first positioning hole is provided on the right side of the pressing die.

[0018] The present invention also provides a method for pressing a clamp into shape, comprising the following steps:

[0019] S1, install the upper mold frame: fix the connecting plate in the upper mold frame to the flange at the bottom end of the hydraulic cylinder piston rod through the fixing bolts and tighten the fixing bolts;

[0020] S2, install the profiling die: insert the upper end of the profiling die with the through hole between the perforated bracket plate and the threaded bracket plate of the upper die frame, and then use the connecting bolts to pass through the installation holes of the perforated bracket plate first, and then enter the through holes of the profiling die until they are facing the threaded holes on the threaded bracket plate, and screw the connecting bolts into the threaded holes. At this time, the upper surfaces of the bosses on both sides of the profiling die are also in contact with the bottom of the upper die frame.

[0021] S3, install the lower die seat: place the lower die seat on the lower working platform of the gantry frame, operate the hydraulic cylinder downward button, and when the distance between the profiling die and the lower die seat is about 10mm, stop the hydraulic cylinder piston rod from moving downward, adjust the lower die seat, and then continue to press the hydraulic cylinder downward button until the profiling die contacts the surface of the lower die seat and fine-tune the lower die seat again, and then use a special pressing plate to lock the lower die seat on the lower working platform of the gantry frame.

[0022] S4, the first pressing of the hoop strip: first place the hoop strip on the upper surface of the lower module of the lower die seat, then pass the positioning rod through the second positioning hole on the right side of the pressing die and the bolt hole on the right end of the hoop strip in sequence and insert it vertically into the first positioning hole on the right side of the lower module for positioning, the other end of the hoop strip is placed in the positioning groove on the left side of the lower module, start the hydraulic cylinder for the first pressing of the hoop strip, after the pressing die presses the hoop strip into place, wait for about 10 seconds and then press the hydraulic cylinder up button to demould.

[0023] S5, the second pressing of the clamp: pull out the positioning rod, turn the unpressed end of the clamp strip around and place it on the lower die seat, and position and press the clamp strip according to the above S4 operation process.

[0024] S6, correct the clamp: If the shape of the clamp pressed in the first two times does not completely meet the requirements of the design drawing, it needs to be corrected using the correction die. Unscrew the connecting bolts from the upper die frame, remove the pressing die at the same time, and then install the correction die in the same way as the pressing die. Start the hydraulic cylinder and start correcting the clamp. For the parts where the curvature of the clamp does not meet the requirements, you can lift the hydraulic cylinder to separate the correction die from the lower die seat, and then manually turn the clamp to put it in the best correction position. Continue to correct the clamp until the straight edge sections of the clamp are completely eliminated and its curvature meets the requirements, that is, the correction of the clamp is completed. Finally, use a special arc plate to detect the roundness of the entire clamp and the bending arc position of the two ends of the clamp.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The clamp pressing and forming device has a reasonable design of pressure transmission between the upper die frame and the pressing die and the correction die, which solves the problem that the connecting bolts have to bear both the connecting function and the function of transmitting the pressing load, and avoids the disadvantage that the connecting bolts may be affected by deformation and its rapid disassembly and assembly.

[0027] 2. In the clamp pressing and forming device, the positioning reference of the clamp pressing part is reasonably selected, and the reasonable design layout of the free end activity space position solves the pressing safety problem and the force symmetry problem of the upper die frame. By adding an upper die frame, the design of the pressing die and the correction die is optimized, the dead weight of the two is reduced, the complexity of die changing is simplified, and the efficiency of switching the die is improved by more than 35%, realizing the automatic pressing and correction of the clamp, ensuring the stability of the clamp pressing quality, and ensuring the compliance of the clamp processing size accuracy with the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the hoop strip after being pressed and formed according to the present invention;

[0029] Figure 2 This is a schematic diagram of the first pressing structure of the hoop strip of the present invention;

[0030] Figure 3 This is a schematic diagram of the second pressing structure of the hoop strip of the present invention;

[0031] Figure 4 This is a schematic diagram of the shape correction structure of the hoop slats of the present invention;

[0032] Figure 5 It is a schematic diagram of the connection between the shape correction mold and the hoop strip of the present invention;

[0033] Figure 6 This is a schematic diagram of the upper mold frame structure of the present invention;

[0034] Figure 7 It is a schematic diagram of the structure of the lower die base of the present invention;

[0035] Figure 8 It is a schematic diagram of the structure of the pressing mold of the present invention;

[0036] Fig. 9 It is a schematic diagram of the shape correction mold structure of the present invention.

[0037] In the figure: 1. hydraulic cylinder; 2. upper mold frame; 21. connecting plate; 22. rib plate; 23. threaded bracket plate; 24. bracket plate with holes; 3. hoop plate; 4. pressing mold; 41. second positioning hole; 5. positioning rod; 6. lower mold base; 61. positioning plate; 62. lower mold block; 63. mold base bottom plate; 64. limit plate; 65. slope surface; 66. first positioning hole; 67. positioning groove; 7. shaping mold; 8. connecting bolt; 9. lower working platform of gantry frame; 10. fixing bolt. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] Reference Figure 1-Figure 9 A clamp pressing and forming device comprises a hydraulic cylinder 1, an upper die frame 2, a clamp strip 3, a pressing die 4, a positioning rod 5, a lower die seat 6, a shaping die 7, a connecting bolt 8 and a lower working platform 9 of a gantry frame. The upper die frame 2 is fixed to the piston rod flange of the hydraulic cylinder 1 by a fixing bolt 10, so that the hydraulic cylinder 1 can lift and press the upper die frame 2. The upper die frame 2 comprises a connecting plate 21, a rib plate 22, a threaded bracket plate 23, and a bracket plate 24 with holes. A threaded hole is provided on the connecting plate 21. The connecting plate 21 is connected to the piston rod flange of the hydraulic cylinder 1 by a fixing bolt 10. A convenient clamping plate 3 is formed between the threaded bracket plate 23 and the bracket plate 24 with holes when pressing or shaping. Its free end can pass through the long strip space therein without obstacles, which not only ensures the positioning and limiting requirements in the clamp pressing, but also ensures the effective deformation activity space in the clamp pressing process, avoiding the deformation direction of the clamp being affected by space limitations. In addition, due to the unique structural design of the upper mold frame 2, it is convenient to switch between the pressing mold 4 and the shaping mold 7, avoiding the excessive design of the pressing mold 4 and the shaping mold 7, reducing the mold weight, and reducing the labor intensity of mold change (if the upper mold frame 2 is cancelled, and the pressing mold 4 and the shaping mold 7 are designed to be directly connected to the piston rod flange of the hydraulic cylinder 1, the structures of the pressing mold 4 and the shaping mold 7 are bound to be complicated and bulky, and the mold change will be more cumbersome and time-consuming, and the labor intensity is also high);

[0040] The threaded bracket plate 23 is provided with threaded holes adapted to the connecting bolts 8, and the bracket plate with holes 24 is provided with mounting holes adapted to the connecting bolts 8. The threaded holes and the mounting holes are located on the same horizontal line, so that the pressing mold 4 and the correction mold 7 can be quickly disassembled and assembled through the connecting bolts 8.

[0041] The lower die base 6 is fixed on the lower working platform 9 of the gantry frame. The lower die base 6 is locked on the lower working platform 9 of the gantry frame through a special pressure plate. The lower die base 6 includes a positioning plate 61, a lower module 62, a die base bottom plate 63, and a limit plate 64. The upper sides of the inner side walls of both ends of the lower module 62 are formed with slope surfaces 65. The upper right side of the lower module 62 is provided with a first positioning hole 66, and the upper left side of the lower module 62 is provided with a positioning groove 67, as shown in the accompanying drawings. Figure 7 As shown, attached Figure 7R, r, Φ, where R is related to the roundness of the entire clamp, and its value should be combined with the clamp material. When the clamp material is stainless steel plate, the R value is usually 1-2mm less than the R' value of the clamp design; the r value determines whether the stainless steel strip will be pulled (scratched) during the clamp pressing, and r is usually taken as ≥30mm; the value of parameter Φ is related to whether the bending angle of the two ends of the clamp plate meets the requirements of the design drawing, and the Φ angle is generally 2°-3°;

[0042] The pressing die 4 is used to press the hoop strips 3, and the shaping die 7 is used to shape the hoop that does not meet the requirements of the design drawings after pressing. The connecting bolts 8 are used to fix the pressing die 4 or the shaping die 7 on the upper die frame 2. The structural designs of the pressing die 4 and the shaping die 7 both have upper hanging functions and bearing functions. The upper ends of the pressing die 4 and the shaping die 7 are provided with through holes for connecting the connecting bolts 8 to pass through and connect them to the upper die frame 2. The bosses on both sides of the pressing die 4 and the shaping die 7 are directly in contact with the bottom of the upper die frame to bear the pressure of pressing the hoop, so that the connecting bolts 8 mainly play the role of pins and do not bear the compressive load of the pressing device. All pressures are directly transmitted to the bosses on the pressing die 4 and the shaping die 7 through the upper die frame 2, avoiding the deformation of the connecting bolts 8 due to stress, thereby affecting their disassembly and mold replacement;

[0043] Bolt holes are provided at both ends of the hoop slat 3, and a second positioning hole 41 is provided on the right side of the pressing die 4 and is located on the same vertical line as the first positioning hole 66. When the hoop slat 3 is pressed, the positioning rod 5 passes through the second positioning hole 41 on the right side of the pressing die 4 and the bolt hole at one end of the hoop slat 3, and then is inserted into the first positioning hole 66 on the right slope surface 65 of the lower die base 6 for positioning. The other free end of the hoop slat 3 is placed in the positioning groove 67 formed between the two positioning plates 61 on the left side of the lower die base 6 and the lower module 62. When all preparations are ready, the hydraulic cylinder 1 can be started to perform the pressing work.

[0044] The present invention also discloses a method for pressing a clamp, which comprises the following steps:

[0045] S1, install the upper mold frame: fix the connecting plate 21 in the upper mold frame 2 to the flange at the bottom end of the piston rod of the hydraulic cylinder 1 by means of the fixing bolts 10 and tighten the fixing bolts 10, install the upper mold frame 2 on the hydraulic cylinder 1, so that the hydraulic cylinder 1 can lift and pressurize the upper mold frame 2;

[0046] S2, install the pressing die: insert the upper end of the pressing die 4 with a through hole between the perforated bracket plate 24 and the threaded bracket plate 23 of the upper die frame 2, and then use the connecting bolt 8 to first pass through the installation hole of the perforated bracket plate 24, and then enter the through hole of the pressing die 4 until it is facing the threaded hole on the threaded bracket plate 23, and screw the connecting bolt 8 into the threaded hole to prevent it from loosening and sliding off, so that the pressing die 4 can be installed on the upper die frame 2, and the upper surface of the convex table surface on both sides of the pressing die 4 is also in contact with the bottom of the upper die frame 2;

[0047] S3, install the lower die seat: place the lower die seat 6 on the lower working platform 9 of the gantry frame, operate the downward button of the hydraulic cylinder 1, and when the distance between the pressing die 4 and the lower die seat 6 is about 10 mm, stop the downward movement of the piston rod of the hydraulic cylinder 1, adjust the lower die seat 6, and then continue to press the downward button of the hydraulic cylinder 1 until the pressing die 4 contacts the surface of the lower die seat 6 and fine-tune and correct the lower die seat 6 again, and then use a special pressing plate to lock the lower die seat 6 on the lower working platform 9 of the gantry frame for pressing the hoop slats 3;

[0048] S4, first pressing of the hoop strip: refer to Figure 2 First, place the hoop strip 3 on the upper surface of the lower module 62 of the lower die seat 6, then pass the positioning rod 5 through the second positioning hole 41 on the right side of the pressing die 4 and the bolt hole on the right end of the hoop strip 3 in sequence and vertically insert it into the first positioning hole 66 on the right side of the lower module 62 for positioning, and place the other end of the hoop strip 3 in the positioning groove 67 on the left side of the lower module 62. Start the hydraulic cylinder 1 to perform the first pressing of the hoop strip 3. After the pressing die 4 presses the hoop strip 3 into place, wait for about 10 seconds and then press the upward button of the hydraulic cylinder 1 to demould;

[0049] S5, the second pressing of the clamp: refer to Figure 3 , pull out the positioning rod 5, turn the unpressed end of the hoop strip 3 around and place it on the lower die seat 6, and position and press the hoop strip 3 according to the above-mentioned "step 4" operation process. The first arc-shaped portion of the hoop strip 3 during this pressing process will automatically pass through the long strip space between the threaded bracket plate 23 and the perforated bracket plate 24 without hindrance (Note: the size of the long strip space should be calculated according to the structural size of the hoop during design). The setting of the long strip space can avoid interference between the hoop strip 3 and the upper die frame 2 during pressing;

[0050] S6, calibration clamp: refer to Figure 4, the shape of the clamp after the first two pressings does not completely meet the requirements of the design drawings, and it needs to be corrected using the shape correction die 7. Unscrew the connecting bolt 8 from the upper mold frame 2, remove the pressure forming die 4 at the same time, and then install the shape correction die 7 in the same way as the pressure forming die 4. It should be pointed out that at this time, the clamp after two pressings has been put on the shape correction die 7. The way to install the clamp on the shape correction die 7 is: directly put the clamp into the shape correction die 7 from the side of the shape correction die 7, and do not forcefully pull the open end of the clamp to be stuck in the shape correction die 7. After the correction is completed, the clamp is removed from the shape correction die 7 in this way, and the hydraulic cylinder 1 is started to start the clamp correction. The hoop, the shaping die 7 and the upper die frame 2 are a trinity and have guiding properties. During the shaping pressing, it can be well ensured that the hoop is facing the center of the groove of the lower die seat 6. Moreover, for the parts where the curvature of the hoop does not meet the requirements, the hydraulic cylinder 1 can be lifted to separate the shaping die 7 from the lower die seat 6, and then the hoop can be manually rotated to be in the best shaping position, and the shaping of the hoop is continued until all the straight edge sections of the hoop are eliminated and its curvature meets the requirements, that is, the shaping of the hoop is completed. Finally, a special arc plate is used to respectively detect the roundness of the entire hoop and the bending arc position of the two ends of the hoop to complete the pressing and forming of the hoop strips 3.

[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A clamp pressing and forming device, comprising a hydraulic cylinder (1), an upper die frame (2), a clamp plate (3), a pressing die (4), a positioning rod (5), a lower die seat (6), a shaping die (7), connecting bolts (8) and a lower working platform (9) of a gantry frame, characterized in that: The upper mold frame (2) is fixed to the piston rod flange of the hydraulic cylinder (1) by means of fixing bolts (10), and the upper mold frame (2) comprises a connecting plate (21), a rib plate (22), a threaded support plate (23), and a support plate with holes (24), wherein a long strip space is formed between the threaded support plate (23) and the support plate with holes (24), so that the free end of the clamping plate strip (3) can pass through the space without any obstacles when pressing or shaping; The lower die base (6) is fixed on the lower working platform (9) of the gantry frame, and the lower die base (6) comprises a positioning plate (61), a lower die block (62), a die base bottom plate (63), and a limit plate (64); The pressing die (4) is used to press the clamp strip (3), the shaping die (7) is used to shape the clamp that does not meet the design requirements after pressing, and the connecting bolts (8) are used to fix the pressing die (4) or the shaping die (7) on the upper die frame (2); Bolt holes are provided at both ends of the hoop strip (3).

2. A clamp pressing and forming device according to claim 1, characterized in that: The connection plate (21) is provided with a threaded hole, and the connection plate (21) is connected to the piston rod flange of the hydraulic cylinder (1) via a fixing bolt (10).

3. The clamp pressing and forming device according to claim 1, characterized in that: The threaded bracket plate (23) is provided with a threaded hole adapted to the connecting bolt (8), and the perforated bracket plate (24) is provided with a mounting hole adapted to the connecting bolt (8), and the threaded hole and the mounting hole are located on the same horizontal line.

4. The clamp pressing and forming device according to claim 1, characterized in that: The lower die seat (6) is locked on the lower working platform (9) of the gantry frame via a special pressing plate.

5. The clamp pressing and forming device according to claim 1, characterized in that: The upper ends of the pressing die (4) and the shaping die (7) are both provided with through holes for connecting bolts (8) to pass through and connect them to the upper die frame (2), and the bosses on both sides of the pressing die (4) and the shaping die (7) are directly in contact with the bottom of the upper die frame (2).

6. The clamp pressing and forming device according to claim 1, characterized in that: The upper sides of the inner side walls at both ends of the lower module (62) are formed with slope surfaces (65), the upper right side of the lower module (62) is provided with a first positioning hole (66), and the upper left side of the lower module (62) is provided with a positioning groove (67).

7. A clamp pressing and forming device according to claim 6, characterized in that: A second positioning hole (41) is provided on the right side of the pressing die (4) and is located on the same vertical line as the first positioning hole (66).

8. A method for pressing a clamp, comprising pressing the clamp by the clamp pressing device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, installing the upper mold frame: fixing the connecting plate (21) in the upper mold frame (2) to the flange at the bottom end of the piston rod of the hydraulic cylinder (1) by means of fixing bolts (10) and tightening the fixing bolts (10); S2, installing the pressing die: insert the upper end of the pressing die (4) with a through hole between the perforated support plate (24) and the threaded support plate (23) of the upper die frame (2), and then use the connecting bolt (8) to first pass through the installation hole of the perforated support plate (24), and then enter the through hole of the pressing die (4) until it is facing the threaded hole on the threaded support plate (23), and then screw the connecting bolt (8) into the threaded hole. At this time, the upper surface of the boss surface on both sides of the pressing die (4) is also in contact with the bottom of the upper die frame (2). S3, install the lower die base: place the lower die base (6) on the lower working platform (9) of the gantry frame, operate the downward button of the hydraulic cylinder (1), and when the distance between the pressing die (4) and the lower die base (6) is about 10 mm, stop the downward movement of the piston rod of the hydraulic cylinder (1), adjust the lower die base (6), and then continue to press the downward button of the hydraulic cylinder (1) until the pressing die (4) and the lower die base (6) are in contact with the surface and the lower die base (6) is fine-tuned and corrected again, and then the lower die base (6) is locked on the lower working platform (9) of the gantry frame with a special pressing plate. S4, the first pressing of the hoop strip: first place the hoop strip (3) on the upper surface of the lower module (62) of the lower die seat (6), then pass the positioning rod (5) through the second positioning hole (41) on the right side of the pressing die (4) and the bolt hole at the right end of the hoop strip (3) in sequence and vertically insert it into the first positioning hole (66) on the right side of the lower module (62) for positioning, the other end of the hoop strip (3) is placed in the positioning groove (67) on the left side of the lower module (62), start the hydraulic cylinder (1) to perform the first pressing of the hoop strip (3), after the pressing die (4) presses the hoop strip (3) into place, wait for about 10 seconds and then press the upward button of the hydraulic cylinder (1) to demould. S5, the second pressing of the clamp: pull out the positioning rod (5), turn the unpressed end of the clamp strip (3) around and place it on the lower die seat (6), and position and press the clamp strip (3) according to the above S4 operation process. S6, calibrating the clamp: if the shape of the clamp after the first two pressings does not completely meet the requirements of the design drawing, it needs to be corrected using the correction die (7). Unscrew the connecting bolt (8) from the upper die frame (2), remove the pressing die (4) at the same time, and then install the correction die (7) in the same way as the pressing die (4). Start the hydraulic cylinder (1) and start the clamp correction. For the part where the curvature of the clamp does not meet the requirements, the correction die (7) can be separated from the lower die seat (6) by lifting the hydraulic cylinder (1). Then, the clamp is manually rotated to be in the best correction position. Continue to correct the shape of the clamp until the straight edge section of the clamp is completely eliminated and its curvature meets the requirements. That is, the correction of the clamp is completed. Finally, use a special arc plate to respectively detect the roundness of the entire clamp and the bending arc position of the two ends of the clamp.

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