Hydraulic press for shaping sheet metal

Abstract

The present application relates to the technical field of plate hydraulic machine, disclose a kind of plate pressure shaping hydraulic machine, including lower base body, the middle part of the top of lower base body is provided with support base, the top of lower base body four corners is provided with support column, the top of four groups of support column is commonly provided with upper base body, the bottom of upper base body is provided with four groups of plunger main cylinder;The present application is equipped with four groups of lower plunger cylinder and four groups of upper plunger cylinder with built-in displacement sensor, realizes moment leveling system control, and is matched with four sets of displacement sensor data, real-time adjustment high-frequency response proportional servo valve control parameter, and mobilizes dedicated leveling system high-pressure pump group and energy accumulator, complete to lower plunger cylinder and upper plunger cylinder Rapid stable liquid supplement, realize high response closed-loop control, ensure to realize high-precision high-performance leveling task, finally, leveling accuracy is better than 0.08mm / m, reach the most advanced similar product level in the world, it is 1.5 times of the similar product in the current domestic.

Description

Technical Field

[0001] This invention relates to the field of hydraulic press technology for sheet metal parts, specifically a hydraulic press for forming sheet metal parts. Background Technology

[0002] Extra-thick high-strength quenched and tempered alloy steel plates are widely used in submarines, ships, armor, vessels, rail transportation, heavy-duty vehicles, and other fields. In most cases, these plates need to be pressed into workpieces of various shapes before use. Due to the high strength of the steel plates, the rebound after pressing is large, and the rebound repeatability is poor, posing many difficulties for plate forming. High-precision forming of ultra-large, large-radius, and irregularly shaped high-strength quenched and tempered alloy steel plates has been a long-standing challenge in China. This project, based on the needs of a domestic enterprise, developed a hydraulic press and mold for forming ultra-large tonnage extra-thick high-strength quenched and tempered alloy steel plates. Its tonnage, table size, control precision, and the quality, size, and accuracy of the formed parts have all reached international leading levels.

[0003] Uniform distribution of forming pressure and reduction of springback are key issues that urgently need to be addressed in the forming of extra-thick plates. Existing forming pressure distribution is usually provided by a plunger master cylinder. However, during the forming process, the pressure is uneven due to the stress and rebound force of the extra-thick high-strength quenched and tempered alloy steel plate itself. At the same time, when the plunger master cylinder drives the hydraulic main plate to move, the pressure on the steel plate will also be unbalanced due to its own weight and displacement distance. Therefore, a hydraulic press mechanism that can provide stable pressure for extra-thick high-strength quenched and tempered alloy steel plates and can be automatically adjusted is needed. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic press for forming sheet metal, in order to solve the problems mentioned in the background art, such as the deformation of sheet metal caused by the rebound force and stress of the sheet metal itself during the hydraulic pressing process of extra-thick high-strength quenched and tempered alloy steel sheets, as well as the deformation of sheet metal due to the inconsistent force and displacement distance of the hydraulic main plate.

[0005] To achieve the above objectives, the present invention provides the following technical solution: including a lower base body, a support base is provided at the middle of the top of the lower base body, support columns are provided at the four corners of the top of the lower base body, an upper base body is provided at the top of the four sets of support columns, and four sets of plunger main cylinders are provided at the bottom of the upper base body, and a hydraulic main board is provided at the bottom of the four sets of plunger main cylinders.

[0006] Each of the four sets of supporting columns has a lower plunger cylinder at its bottom, which is away from each other at one end, and an upper plunger cylinder at the top of each supporting column near the lower plunger cylinder. A lower positioning mounting seat is provided between the outer side of the lower plunger cylinder and the supporting base, and the two ends of the lower positioning mounting seat are bolted to the supporting column. An upper positioning mounting seat is provided between the outer side of the upper plunger cylinder and the upper base body, and the two ends of the upper positioning mounting seat are bolted to the supporting column.

[0007] The output ends of the lower piston cylinder and the upper piston cylinder are connected to a connecting crossbeam. Two sets of balance connecting seats are symmetrically sleeved on the outer side of the connecting crossbeam and bolted to the outer side of the hydraulic main board. A mechanical leveling mechanism is provided between the balance connecting seat and the connecting crossbeam, and a level sensor is provided inside the hydraulic main board.

[0008] The input ends of the four sets of lower piston cylinders and the four sets of upper piston cylinders are all connected to a high-pressure pump set and an accumulator. The lower piston cylinder and the upper piston cylinder are all equipped with displacement sensors. The high-pressure pump set, the accumulator, the displacement sensor and the level sensor are all electrically connected to the torque control and leveling system.

[0009] Preferably, the mechanical leveling mechanism includes a clamping cavity disposed in the center of the balance connecting seat. Both ends of the clamping cavity are provided with balance pressure plates that are tightly fitted to both ends of the connecting beam. The center of both ends of the balance connecting seat is provided with threaded grooves B extending into them. A main adjusting bolt is threaded into the threaded groove B, and the bottom of the main adjusting bolt is fitted to the center of one end of the balance pressure plate. Threaded grooves A extending into the center are provided at the four corners of both ends of the balance connecting seat. Balance bolts are threaded into the threaded grooves A. A balance spring is provided at the end of each balance bolt near the balance pressure plate, fitting against the balance pressure plate. By providing a mechanical adjustment mechanism, fine-tuning of the force at the connection between the connecting beam and the balance connecting seat is achieved, thereby ensuring the horizontal stability of the hydraulic main plate.

[0010] Preferably, the four sets of plunger master cylinders are 40MN, which can provide a maximum pressing force of 160MN. At the same time, copper-based alloy wear-resistant material is used as the guide sleeve, and V-type combined sealing rings are used for sealing to ensure that there is no oil leakage in the cylinder under high pressure operation.

[0011] Preferably, a feeding support platform is provided at one end of the front of the support base, a displacement groove is provided in the middle of the top of the feeding support platform, slide rails are symmetrically provided on both sides of the top of the feeding support platform and the support base, a hydraulic working platform is provided at the top of the support base, and an installation groove A is provided in the middle of the top of the support base. A hydraulic piston cylinder is provided inside the installation groove A, and the output end of the hydraulic piston cylinder is bolted to the bottom of the installation groove A. The installation groove A is pushed to a certain position by the slide rails and the hydraulic piston cylinder, which facilitates the feeding and unloading of materials.

[0012] Preferably, eight sets of tie rods are evenly arranged between the ends of the four sets of supporting columns that are close to each other, and the eight sets of tie rods are connected to the inner side of the supporting columns by eight tie rod nuts. A staircase is provided on one side of the supporting base and the upper base body, and the top of the staircase is flush with the top of the upper base body. A main oil pump mechanism is provided on the top of the upper base body. The input end of the main oil pump mechanism is connected to sixteen high-pressure plunger pumps. A constant power variable pump and an externally controlled proportional flow plunger pump are used as the main hydraulic pumps to cooperate with the sixteen high-pressure plunger pumps for hydraulic control. At the same time, the oil suction pipe of the high-pressure plunger pump is not less than DN125, and the constant power variable pump and the externally controlled proportional flow plunger pump are connected in series and share a drive motor, which effectively reduces motor noise.

[0013] Preferably, each of the four sets of supporting columns has an installation groove B inside the end near the lower piston cylinder. Each installation groove B has a balance slide column inside. Each output end of the lower piston cylinder and the upper piston cylinder has a sliding collar on its outer side. The other end of the sliding collar extends into the installation groove B and is fitted onto the outer side of the balance slide column. By providing the balance slide column, the output ends of the lower piston cylinder and the upper piston cylinder slide relative to the balance slide column through the sliding collar when they move up and down, thereby ensuring the stability of the position structure of the output ends of the lower piston cylinder and the upper piston cylinder.

[0014] Preferably, connecting discs are provided between both ends of the connecting beam and the output ends of the lower and upper piston cylinders, and mounting through holes are evenly provided at the edges of the connecting discs. The output ends of the lower and upper piston cylinders are provided with connecting flange seats that are compatible with the connecting discs. The connection discs and connecting flange seats ensure the stability of the connection structure between the lower and upper piston cylinders and the connecting beam.

[0015] Compared with the prior art, the present invention provides a sheet metal forming hydraulic press, which has the following beneficial effects:

[0016] 1. This invention achieves torque leveling system control by setting up four sets of lower plunger cylinders and four sets of upper plunger cylinders with built-in displacement sensors. In addition, it uses data from four sets of displacement sensors to adjust the control parameters of the high-frequency response proportional servo valve in real time, and mobilizes a dedicated leveling system high-pressure pump set and accumulator to complete the rapid and stable replenishment of liquid to the lower and upper plunger cylinders, realizing high-response closed-loop control and ensuring high-precision and high-performance leveling tasks. Ultimately, the leveling accuracy is better than 0.08mm / m, reaching the level of the most advanced similar products in the world, and is 1.5 times that of similar products in China.

[0017] 2. This invention uses a connecting beam and a balance connecting seat to level the hydraulic mainboard connected to the balance connecting seat. During installation, the support force of the connecting beam on the hydraulic mainboard varies due to differences in bolt tightening and uneven weight distribution within the structure. By adjusting the eight sets of balance bolts at both ends of the balance connecting seat and using a high-sensitivity level sensor inside the hydraulic mainboard to transmit the position, the position of the connecting beam is changed by adjusting the pressure exerted by the two sets of balance pressure plates on both ends of the connecting beam. At this point, the height of both ends inside the clamping cavity is greater than the sum of the heights of the connecting beam and the two sets of balance pressure plates. Attached Figure Description

[0018] Figure 1 This is a front view schematic diagram of the main structure of the present invention;

[0019] Figure 2 This is a rear view schematic diagram of the main structure of the present invention;

[0020] Figure 3 This is a top sectional view of the structure of the present invention;

[0021] Figure 4 This is an enlarged sectional view of the connection structure between the lower plunger cylinder, the upper plunger cylinder, and the connecting crossbeam in this invention;

[0022] Figure 5 This is an enlarged sectional view of the structure at the supporting column in this invention;

[0023] Figure 6 This is an enlarged sectional view of the connection structure between the connecting beam and the balance connecting seat in this invention;

[0024] Figure 7 This is an enlarged anatomical view of the structure at the balance connecting seat in this invention;

[0025] In the diagram: 1. Lower base body; 2. Feeding support platform; 3. Displacement groove; 4. Slide rail; 5. Lower piston cylinder; 6. Connecting crossbeam; 7. Upper piston cylinder; 8. Upper positioning mounting seat; 9. Main oil pump mechanism; 10. Support column; 11. Balance connecting seat; 12. Hydraulic working platform; 13. Lower positioning mounting seat; 14. Staircase; 15. Mounting groove A; 16. Balance sliding column; 17. Support base; 18. Sliding collar; 19. Mounting groove B; 20. Connecting disc; 21. Main adjusting bolt; 22. Balance spring; 23. Balance bolt; 24. Clamping cavity; 25. Threaded groove A; 26. Balance pressure plate; 27. Threaded groove B; 28. Upper base body; 29. ​​Hydraulic piston cylinder. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1:

[0028] Please see Figure 1-7 This invention provides a technical solution: a sheet metal forming hydraulic press, comprising a lower base body 1, a support base 17 disposed at the center of the top of the lower base body 1, support columns 10 disposed at the four corners of the top of the lower base body 1, an upper base body 28 disposed at the top of the four sets of support columns 10, four sets of plunger main cylinders disposed at the bottom of the upper base body 28, and a hydraulic main plate disposed at the bottom of the four sets of plunger main cylinders.

[0029] Each of the four sets of support columns 10 has a lower plunger cylinder 5 at its bottom, which is away from each other at one end. Each of the support columns 10 has an upper plunger cylinder 7 at its top, which is close to the lower plunger cylinder 5. A lower positioning mounting seat 13 is provided between the outer side of the lower plunger cylinder 5 and the support base 17. Both ends of the lower positioning mounting seat 13 are bolted to the support column 10. An upper positioning mounting seat 8 is provided between the outer side of the upper plunger cylinder 7 and the upper base body 28. Both ends of the upper positioning mounting seat 8 are bolted to the support column 10.

[0030] The output ends of the lower piston cylinder 5 and the upper piston cylinder 7 are connected to a connecting crossbeam 6. Two sets of balance connecting seats 11 are symmetrically sleeved on the outer side of the connecting crossbeam 6 and bolted to the outer side of the hydraulic main board. A mechanical leveling mechanism is provided between the balance connecting seat 11 and the connecting crossbeam 6, and a level sensor is provided inside the hydraulic main board.

[0031] As a preferred embodiment, the mechanical leveling mechanism includes a clamping cavity 24 located in the center of the balance connecting seat 11. Both ends of the clamping cavity 24 are fitted with balance pressure plates 26 that are tightly fitted to both ends of the connecting beam 6. Both ends of the balance connecting seat 11 have threaded grooves B27 extending into them. A main adjusting bolt 21 is threaded into the threaded groove B27, and the bottom of the main adjusting bolt 21 is fitted to the center of one end of the balance pressure plate 26. Threaded grooves A25 extending into them are located at the four corners of both ends of the balance connecting seat 11. Balance bolts 23 are threaded into the threaded grooves A25. A balance spring 22, fitted to the balance pressure plate 26, is located at the end of each balance bolt 23 near the balance pressure plate 26. By providing this mechanical adjustment mechanism, fine-tuning of the force at the connection between the connecting beam 6 and the balance connecting seat 11 is achieved, thereby ensuring the horizontal stability of the hydraulic main plate.

[0032] As a preferred embodiment, the four sets of plunger master cylinders are 40MN, which can provide a maximum pressing force of 160MN, thereby realizing the function of rapidly increasing the pressing pressure and ensuring the stable operation of the system. At the same time, copper-based alloy wear-resistant material is used as the guide sleeve to reduce the problem of plunger rod failure and oil leakage caused by friction during long-term operation. V-type combined sealing rings are used for sealing to ensure that there is no oil leakage in the cylinder under high pressure operation.

[0033] As a preferred embodiment: a feeding support platform 2 is provided at one end of the front of the support base 17, a displacement groove 3 is provided in the middle of the top of the feeding support platform 2, slide rails 4 are symmetrically provided on both sides of the top of the feeding support platform 2 and the support base 17, a hydraulic working platform 12 is provided on the top of the support base 17, and an installation groove A15 is provided in the middle of the top of the support base 17. A hydraulic piston cylinder 29 is provided inside the installation groove A15, and the output end of the hydraulic piston cylinder 29 is bolted to the bottom of the installation groove A15. The position of the installation groove A15 is pushed by the slide rails 4 and the hydraulic piston cylinder 29, which facilitates the feeding and discharging of materials.

[0034] As a preferred embodiment: eight sets of tie rods are evenly arranged between the ends of the four sets of support columns 10 that are close to each other, and the eight sets of tie rods are connected to the inner side of the support columns 10 through eight tie rod nuts. A staircase 14 is provided on one side of the support base 17 and the upper base body 28, and the top of the staircase 14 is flush with the top of the upper base body 28. A main oil pump mechanism 9 is provided on the top of the upper base body 28. The input end of the main oil pump mechanism 9 is connected to sixteen high-pressure plunger pumps. A constant power variable pump and an externally controlled proportional flow plunger pump are used as the main hydraulic pumps to cooperate with the sixteen high-pressure plunger pumps for hydraulic control, effectively achieving the requirements of energy saving and noise reduction control. At the same time, the oil suction pipe of the high-pressure plunger pump is not less than DN125, and the constant power variable pump and the externally controlled proportional flow plunger pump are connected in series and share a drive motor, which effectively reduces motor noise.

[0035] like Figure 1-7 As shown, when the hydraulic press connects the connecting beam 6 and the hydraulic main board, two sets of balance connecting seats 11 are respectively sleeved on the outside of the connecting beam 6 and bolted to the outside of the hydraulic main board. At this time, the balance connecting seats 11 and the hydraulic main board are fixedly connected.

[0036] Further, the connecting flanges at the output ends of the lower piston cylinder 5 and the upper piston cylinder 7 are connected to the connecting discs 20 at both ends of the connecting beam 6, thereby positioning the basic position of the connecting beam 6. At this time, the positions of the lower piston cylinder 5 and the upper piston cylinder 7 are adjusted and positioned by their internal displacement sensors, thereby positioning the hydraulic main plate connected to the connecting beam 6. At this time, the level sensor inside the hydraulic main plate transmits the signal to the external torque leveling control system, thereby providing feedback on the horizontal position of the hydraulic main plate. At this time, the two sets of main adjusting bolts 21 do not completely press the two sets of balance pressure plates 26. By adjusting the main adjusting bolts... The position between bolt 21 and threaded groove B27 causes the main adjusting bolt 21 to press against the balance plate 26. By changing the position of the two sets of balance plates 26 under pressure, the position height of the connecting beam 6 can be finely adjusted. When the signal transmitted by the level sensor inside the hydraulic main board is horizontal during the adjustment process, the adjustment of the main adjusting bolt 21 is stopped, and the eight sets of balance bolts 23 are tightened at the same time. This causes the balance bolts 23 to compress the balance spring 22 and apply force to the four corners of the two sets of balance plates 26, thereby ensuring that the pressure applied by the two sets of balance plates 26 to both ends of the connecting beam 6 is stable, thus completing the adjustment.

[0037] Example 2:

[0038] The difference from Embodiment 1 is that the input ends of the four sets of lower piston cylinders 5 and the four sets of upper piston cylinders 7 are all connected to a high-pressure pump set and an accumulator, and the lower piston cylinders 5 and the upper piston cylinders 7 are all equipped with displacement sensors. The high-pressure pump set, the accumulator, the displacement sensor, and the level sensor are all electrically connected to the torque control leveling system.

[0039] As a preferred embodiment, each of the four sets of support columns 10 has an installation groove B19 inside the end near the lower piston cylinder 5. Each installation groove B19 has a balance slide column 16 inside. The outer side of the output end of the lower piston cylinder 5 and the upper piston cylinder 7 is provided with a sliding collar 18, and the other end of the sliding collar 18 extends into the installation groove B19 and is sleeved on the outer side of the balance slide column 16. By providing the balance slide column 16, the output ends of the lower piston cylinder 5 and the upper piston cylinder 7 can slide relative to the balance slide column 16 through the sliding collar 18 when moving up and down, thereby ensuring the stability of the position structure of the output ends of the lower piston cylinder 5 and the upper piston cylinder 7.

[0040] As a preferred embodiment, a connecting disc 20 is provided between both ends of the connecting beam 6 and the output ends of the lower plunger cylinder 5 and the upper plunger cylinder 7, and mounting through holes are evenly provided at the edge of the connecting disc 20. The output ends of the lower plunger cylinder 5 and the upper plunger cylinder 7 are provided with connecting flange seats that are compatible with the connecting disc 20. The stability of the connection structure between the lower plunger cylinder 5 and the upper plunger cylinder 7 and the connecting beam 6 is ensured by providing the connecting disc 20 and the connecting flange seats.

[0041] like Figure 1-3 As shown, when the hydraulic press is pressing and forming an extra-thick high-strength tempered alloy steel plate, it adjusts the control parameters of the high-frequency response proportional servo valve in real time through data from four external displacement sensors, and mobilizes the high-pressure pump group and accumulator of the dedicated leveling system to complete the rapid and stable replenishment of fluid to the lower plunger cylinder 5 and the upper plunger cylinder 7, realizing high-response closed-loop control, ensuring the achievement of high-precision and high-performance leveling tasks. Ultimately, the leveling accuracy is better than 0.08mm / m, reaching the level of the most advanced similar products in the world, which is 1.5 times that of similar products in China.

[0042] Simultaneously, sixteen high-pressure plunger pumps, constant-power variable pumps, and externally controlled proportional flow plunger pumps are used to hydraulically control the lower plunger cylinder 5, upper plunger cylinder 7, and four sets of plunger master cylinders. This enables the hydraulic main plate to move downwards in a stable manner, ensuring the stability of the bottom surface of the hydraulic main plate during its downward movement. This, in turn, ensures that the extrusion pressure on various parts of the extra-thick, high-strength, quenched and tempered alloy steel plate to be extruded on the top of the mounting groove A15 remains balanced. Thus, during the pressure holding process, the pressure hardening process is controlled through variable pressure holding technology, optimizing the pressure changes during the forming process. This can shorten the forming time of the workpiece and increase the stamping frequency. The pressure accuracy can reach ±0.2MPa, and stable multi-segment pressure continuous switching and adjustment can be achieved.

[0043] Specifically, in this technical field, all power supplies of various levels in the control section are isolated by an AC380V control transformer before supplying power to each part. The PLC's input / output power and the power supplies for each sensor are all powered by a regulated power supply. The high-voltage power supply section mainly supplies power to the oil pump motor and provides various levels of power to the control system. Furthermore, the high-voltage section utilizes an imported busbar system from Rittal, Germany. Circuit breakers are connected to the busbar system via adapters, eliminating the need for hardwiring, improving efficiency and reliability, and achieving maintenance-free operation.

[0044] The control system employs PLC control, with the hydraulic press and filling system linked via bus communication. The entire production line uses a master-slave control system. The mechatronics system utilizes a distributed controller to independently control each component's closed-loop operation, improving control accuracy and reducing the computational load on the main control system. For high-precision mechatronics integrated control systems, further optimization is achieved through software modules based on the distributed controller, realizing large closed-loop high-precision control.

[0045] The control system is integrated with electromechanical-hydraulic components, and flexible control software is developed according to process requirements to achieve control of the entire process flow, precisely controlling pressure, position, speed, etc. Parameters such as forming pressure, filling chamber pressure, slider displacement, slider speed, and slider balance position error are collected in real time by computer, and the operating parameters are plotted in real time. These data serve as the processing data for the workpiece and as the raw data for judging workpiece quality.

[0046] Working principle: This hydraulic press device uses four sets of lower piston cylinders 5 and four sets of upper piston cylinders 7 to precisely control the position of the connecting crossbeam 6, improving its response rate and ensuring stable flow output. This results in uniform force on the hydraulic main plate. When the hydraulic main plate extrudes the extra-thick high-strength tempered alloy steel plate on the top of the mounting groove A15, the top of the plate is subjected to uniform force. At the same time, during the extrusion and pressure holding process, it achieves precise feedback and control of the rebound force of the extra-thick high-strength tempered alloy steel plate itself.

[0047] Meanwhile, during the assembly process, the force on both ends of the connecting beam 6 can be finely adjusted through the mechanical leveling mechanism between the balance connecting seat 11 and the connecting beam 6, so that the connecting beam 6 can accurately control the horizontal position of the hydraulic main board through the balance connecting seat 11.

[0048] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, and is not intended to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention do not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A sheet metal forming hydraulic press, comprising a lower base body (1), wherein a support base (17) is provided at the center of the top of the lower base body (1), and support columns (10) are provided at the four corners of the top of the lower base body (1). An upper base body (28) is provided at the top of the four sets of support columns (10), and four sets of plunger main cylinders are provided at the bottom of the upper base body (28), wherein a hydraulic main plate is provided at the bottom of the four sets of plunger main cylinders, characterized in that: Each of the four sets of support columns (10) is provided with a lower plunger cylinder (5) at the bottom of one end away from the other, and an upper plunger cylinder (7) is provided at the top of the support column (10) near the lower plunger cylinder (5). A lower positioning mounting seat (13) is provided between the outer side of the lower plunger cylinder (5) and the support base (17), and both ends of the lower positioning mounting seat (13) are bolted to the support column (10). An upper positioning mounting seat (8) is provided between the outer side of the upper plunger cylinder (7) and the upper base body (28), and both ends of the upper positioning mounting seat (8) are bolted to the support column (10). The output ends of the lower piston cylinder (5) and the upper piston cylinder (7) are connected to a connecting beam (6). Two sets of balance connecting seats (11) that are bolted to the outside of the connecting beam (6) are symmetrically sleeved on the outside of the connecting beam (6). A mechanical leveling mechanism is provided between the balance connecting seat (11) and the connecting beam (6), and a level sensor is provided inside the hydraulic main board. The input ends of the four sets of lower piston cylinders (5) and the four sets of upper piston cylinders (7) are all connected to a high-pressure pump set and an accumulator. The lower piston cylinder (5) and the upper piston cylinder (7) are all equipped with displacement sensors. The high-pressure pump set, accumulator, displacement sensor and level sensor are all electrically connected to the torque control leveling system. The mechanical leveling mechanism includes a clamping cavity (24) located in the middle of the balance connecting seat (11). Both ends of the clamping cavity (24) are provided with balance pressure plates (26) that fit tightly against both ends of the connecting beam (6). Both ends of the balance connecting seat (11) are provided with threaded grooves B (27) that extend into the interior. The threaded grooves B (27) are threadedly connected to the interior of the threaded grooves B (27). The bottom of the main adjusting bolts (21) fits against the middle of one end of the balance pressure plate (26). The four corners of both ends of the balance connecting seat (11) are provided with threaded grooves A (25) that extend into the interior. The threaded grooves A (25) are threadedly connected to the interior of the threaded grooves A (25). The end of the balance bolts (23) near the balance pressure plate (26) is provided with a balance spring (22) that fits against the balance pressure plate (26).

2. The sheet metal forming hydraulic press according to claim 1, characterized in that: The four sets of plunger master cylinders are 40MN, which can provide a maximum pressing force of 160MN. They also use copper-based alloy wear-resistant material as guide sleeves and V-type combined sealing rings for sealing.

3. The sheet metal forming hydraulic press according to claim 1, characterized in that: A feeding support platform (2) is provided at one end of the front of the support base (17). A displacement groove (3) is provided in the middle of the top of the feeding support platform (2). Slide rails (4) are symmetrically provided on both sides of the top of the feeding support platform (2) and the support base (17). A hydraulic working platform (12) is provided on the top of the support base (17). An installation groove A (15) is provided in the middle of the top of the support base (17). A hydraulic piston cylinder (29) is provided inside the installation groove A (15), and the output end of the hydraulic piston cylinder (29) is bolted to the bottom of the installation groove A (15).

4. A sheet metal forming hydraulic press according to claim 1, characterized in that: Eight sets of tie rods are evenly arranged between the ends of the four sets of support columns (10) that are close to each other, and the eight sets of tie rods are connected to the inner side of the support column (10) through eight tie rod nuts. A staircase (14) is provided on one side of the support base (17) and the upper base body (28), and the top of the staircase (14) is flush with the top of the upper base body (28). A main oil pump mechanism (9) is provided on the top of the upper base body (28). Sixteen high-pressure plunger pumps are connected to the input end of the main oil pump mechanism (9). A constant power variable pump and an externally controlled proportional flow plunger pump are used as the main hydraulic pumps to cooperate with the sixteen high-pressure plunger pumps for hydraulic control. At the same time, the oil suction pipe of the high-pressure plunger pump is not less than DN125, and the constant power variable pump and the externally controlled proportional flow plunger pump are connected in series and share a drive motor.

5. A sheet metal forming hydraulic press according to claim 1, characterized in that: The four sets of support columns (10) are all provided with mounting grooves B (19) inside the end near the lower piston cylinder (5). The mounting grooves B (19) are all provided with balance slides (16). The lower piston cylinder (5) and the upper piston cylinder (7) are all provided with sliding collars (18) on the outside of their output ends. The other end of the sliding collars (18) extends into the mounting grooves B (19) and is fitted onto the outside of the balance slides (16).

6. A sheet metal forming hydraulic press according to claim 1, characterized in that: A connecting disc (20) is provided between both ends of the connecting beam (6) and the output ends of the lower piston cylinder (5) and the upper piston cylinder (7), and mounting through holes are evenly provided at the edge of the connecting disc (20). The output ends of the lower piston cylinder (5) and the upper piston cylinder (7) are provided with connecting flange seats that are compatible with the connecting disc (20).

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