Hydraulic machine for superplastic inflatable formed pipe

Abstract

The invention discloses a superplastic gas expansion forming pipe hydraulic machine, relates to the technical field of pipe machining, and solves the problems that a worker needs to lift an upper die to be aligned with a mounting clamping groove in a movable cross beam and then needs to bend and raise the head to mount a locking nut, the operation is limited by space, sight dead angles exist, and the working efficiency is high. The hydraulic machine comprises a workbench, supporting stand columns are fixedly installed at the four corners of the upper end of the workbench, a supporting plate is fixedly connected to the upper ends of the supporting stand columns, and a hydraulic machine body is fixedly embedded in the supporting plate; the lower end of the hydraulic machine body is fixedly connected with a pressing plate capable of moving on the outer sides of the four supporting stand columns. By installing the locking assembly and moving the pressing plate downwards, the embedded plate on the upper side of the upper die can be directly embedded into the embedded groove in the lower end of the pressing plate, the lower end of the embedded plate can be automatically supported by the two locking plates, the embedded plate is prevented from being separated from the pressing plate, the upper die can be rapidly installed, and operation is easy and convenient.

Description

Technical Field

[0001] The invention relates to the technical field of pipe processing, in particular to a superplastic gas expansion forming pipe hydraulic press. Background Art

[0002] The superplastic pneumatic forming pipe hydraulic press uses gas as a force transmission medium under heating to make the tube embryo fit on the mold surface, thereby realizing the metal tube forming. The superplastic pneumatic forming pipe hydraulic press mainly consists of five parts: clamping hydraulic press system, high-pressure gas source system, pipe heating system, mold system, and auxiliary system. The clamping hydraulic press system mainly consists of two parts: clamping hydraulic press and side push cylinder servo feeding and sealing system.

[0003] When superplastic inflation forming is performed on pipes, it is necessary to install an appropriate forming mold on the clamping hydraulic press. The lower mold of the mold needs to be fixed on the workbench pad through a locking nut, and the upper mold of the mold needs to be fixed on the movable crossbeam through a locking nut. However, since the clamping hydraulic press is vertical, when fixing the upper mold, the personnel need to first lift the upper mold to align it with the installation slot on the movable crossbeam, and then bend over and look up to install the locking nut. The operation is not only limited by space, but also has blind spots, making it difficult to operate when installing the upper mold. Summary of the invention

[0004] The object of the present invention is to provide a superplastic bulging forming pipe hydraulic press to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A superplastic inflation forming pipe hydraulic press comprises a workbench, wherein support columns are fixedly installed at the four corners of the upper end of the workbench, the upper ends of the support columns are fixedly connected to a support plate, a hydraulic press body is fixedly embedded on the support plate, the lower end of the hydraulic press body is fixedly connected to a pressure plate that can move on the outside of the four support columns, a lower mold is fixedly installed on the upper end of the workbench through a locking nut, an upper mold is installed on the lower side of the pressure plate, and also comprises a locking assembly for locking the pressure plate and the upper mold, the locking assembly is installed inside the pressure plate; an oil spray assembly for spraying lubricating oil onto the surface of the pipe on the upper side of the lower mold, the oil spray assembly is installed on the rear side of the lower mold; a driving assembly for driving the oil spray assembly to rotate, the driving assembly is installed between the pressure plate and the oil spray assembly.

[0006] Preferably, a panel is fixedly mounted on the upper end of the upper die, a mounting groove is provided at the lower end of the pressure plate corresponding to the panel, the lower end of the panel is movably abutted against two symmetrically distributed locking plates, and the locking plates can move left and right inside the pressure plate, and a bevel portion is provided on the locking plate close to the panel, which facilitates the panel to drive the two locking plates away from each other, and two symmetrically distributed springs are fixedly mounted on the ends of the two lock plates away from each other, and the ends of the springs away from the lock plates are fixedly connected to the pressure plate.

[0007] Preferably, two symmetrically distributed limiting wheels are fixedly mounted on the upper end of the locking plate, and the limiting wheels are rollingly connected to the pressure plate through rolling grooves. The limiting wheels are used to prevent the locking plate from separating from the pressure plate. A connecting rod is also fixedly embedded at the center of the upper end of the locking plate, and the connecting rod is slidingly connected to the pressure plate through a limiting straight groove. A diagonal rod is movably sleeved on the outer side of the connecting rod.

[0008] Preferably, the end of the inclined rod away from the connecting rod is rotatably connected to a hinge seat, a screw is installed at the front end center of the pressure plate, a threaded barrel is installed on the outer side of the screw, and the threaded barrel is fixedly embedded in the screw, and a ball is movably embedded at one end of the screw located inside the pressure plate, and the connection between the ball and the hinge seat is a movable abutment, and the ball is used to reduce the friction resistance between the screw and the hinge seat.

[0009] Preferably, the oil spray assembly includes two symmetrically distributed bent spray heads, a conduit 1 interconnected with the bent spray head is fixedly installed on the outer side of the bent spray head, and the bent spray head is used to spray lubricating oil onto the surface of the pipe to be processed, and a sleeve is fixedly connected to the end of the conduit 1 away from the bent spray head, and a conduit 2 interconnected with the conduit is fixedly installed on the outer side of the sleeve, and a one-way valve is fixedly installed on both the conduit 1 and the conduit 2, and an oil tank is fixedly connected to the end of the sleeve away from the sleeve.

[0010] Preferably, a piston is movably embedded inside the sleeve, a push rod is fixedly embedded at the center of the lower end of the piston, a gasket is fixedly connected to the lower end of the push rod, and the lower end surface of the gasket can movably abut against the upper end surface of the pressure plate, the gasket can increase the contact surface between the push rod and the pressure plate, and a spring 2 is movably sleeved on the outer side of the sleeve, and the two ends of the spring 2 are movably abutted against the support plate and the gasket respectively.

[0011] Preferably, a positioning shaft is fixedly passed through the lower ends of the two bending nozzles, and the two bending nozzles are rotatably connected to the workbench through the positioning shaft, and two movable seats that can move left and right are movably installed on the upper end of the workbench, and the two movable seats are located on the left and right sides of the lower mold, and an abutment seat is rotatably installed on the movable seat through a bearing, and the abutment seat is used to abut the end of the pipe, and a motor is also fixedly installed on one of the movable seats, and the motor can drive the abutment seat to rotate through two gears that cooperate with each other.

[0012] Preferably, the driving assembly includes a gear 1 fixedly sleeved at the outer center of the positioning shaft, a tooth plate fixedly installed at the rear end center of the pressure plate, a convex tooth capable of driving the gear 1 to rotate 90° is provided on the front side of the lower end of the tooth plate, and the tooth plate is meshed with the gear 1 through a plurality of convex teeth, and the tooth plate drives the bending nozzle to rotate through the gear 1.

[0013] Preferably, two symmetrically distributed positioning components are installed on the outer side of the positioning shaft, and the gear is located between the two positioning components. The positioning component includes a sleeve fixedly sleeved on the outer side of the positioning shaft, and a mounting seat is movably sleeved on the outer side of the sleeve. The diameter of the sleeve is larger than the diameter of the positioning shaft, and the connection between the mounting seat and the workbench is a fixed connection.

[0014] Preferably, a plurality of embedded tubes equidistantly distributed around the circumference are fixedly embedded inside the mounting seat, and a pin rod is movably embedded at one end of the embedded tube close to the sleeve, and a hemispherical portion is provided at one end of the pin rod close to the sleeve, a blocking piece is fixedly connected to one end of the pin rod located inside the embedded tube, a spring three is movably abutted against a side of the blocking piece away from the pin rod, a plurality of hemispherical grooves equidistantly distributed around the circumference are provided on the outside of the sleeve, and the pin rod is movably engaged with the hemispherical groove via the hemispherical portion, and the hemispherical portion of the pin rod is embedded in the hemispherical groove for locking the positioning shaft.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can install the locking assembly and move the pressing plate downward, so that the panel on the upper side of the upper mold can be directly embedded in the embedding groove at the lower end of the pressing plate, and the two locking plates will automatically support the lower end of the panel to prevent the panel from being separated from the pressing plate, which is conducive to the rapid installation of the upper mold and is simple and convenient to operate.

[0016] 2. The present invention installs an oil spray assembly, and drives the piston to move upward inside the sleeve by moving the pressure plate upward, so that the lubricating oil in the sleeve is sprayed on the surface of the pipe on the upper side of the lower mold. In the process of spraying the lubricating oil on the surface of the pipe, the motor can drive the abutment seat and the pipe to rotate through two mutually cooperating gears, which is conducive to the uniform distribution of the lubricating oil on the surface of the pipe, and can effectively reduce the friction between the pipe and the mold, making the pipe easier to form and improving the processing efficiency.

[0017] 3. The present invention installs a driving assembly and a locking assembly. When the pressure plate moves down to merge the upper mold and the lower mold, the tooth plate in the driving assembly can drive gear 1 and the bending nozzle to rotate 90°, thereby preventing the bending nozzle from obstructing the merging of the upper mold and the lower mold. When the bending nozzle rotates, the pin rod in the locking assembly will be embedded in the corresponding hemispherical slot, and the bending nozzle can be positioned through the positioning shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of the present invention; Figure 2 It is a right side cross-sectional schematic diagram of the present invention; Figure 3 It is a front side cross-sectional schematic diagram of the present invention; Figure 4 It is a schematic diagram of the separation of the locking assembly and the upper mold of the present invention; Figure 5 It is an overall schematic diagram of the fuel injection assembly of the present invention; Figure 6 It is a side cross-sectional schematic diagram of the sleeve of the present invention; Figure 7 This is a schematic diagram of the splitting of the locking assembly and the positioning shaft of the present invention; Figure 8 It is a right side cross-sectional schematic diagram of the locking assembly of the present invention.

[0019] In the figure: 1. workbench; 2. support column; 3. support plate; 4. hydraulic press body; 5. pressure plate; 6. lower die; 7. upper die; 8. inlay plate; 9. lock plate; 10. spring one; 11. limit wheel; 12. connecting rod; 13. inclined tie rod; 14. hinge seat; 15. screw; 16. threaded barrel; 17. ball; 18. bending nozzle; 19. catheter one; 20. sleeve; 21. catheter two; 22. one-way valve; 23. oil tank; 24. piston; 25. push rod; 26. gasket; 27. spring two; 28. positioning shaft; 29. ​​gear one; 30. tooth plate; 31. sleeve; 32. mounting seat; 33. embedded pipe; 34. pin; 35. baffle; 36. spring three; 37. hemispherical slot; 38. moving seat; 39. abutment seat; 40. motor. DETAILED DESCRIPTION

[0020] 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.

[0021] Example 1: Please refer to Figure 1-Figure 4 The figure shows a superplastic inflation forming pipe hydraulic press, including a workbench 1, with supporting columns 2 fixedly installed at the four corners of the upper end of the workbench 1, and a supporting plate 3 fixedly connected to the upper end of the supporting column 2, a hydraulic press body 4 fixedly embedded on the support plate 3, and a pressing plate 5 that can move on the outside of the four supporting columns 2 is fixedly connected to the lower end of the hydraulic press body 4. A lower mold 6 is fixedly installed on the upper end of the workbench 1 through a locking nut, and an upper mold 7 is installed on the lower side of the pressing plate 5. It also includes a locking assembly for locking the pressing plate 5 and the upper mold 7, and the locking assembly is installed inside the pressing plate 5; an oil spray assembly is used to spray lubricating oil on the surface of the pipe on the upper side of the lower mold 6, and the oil spray assembly is installed on the rear side of the lower mold 6; a driving assembly is used to drive the oil spray assembly to rotate, and the driving assembly is installed between the pressing plate 5 and the oil spray assembly.

[0022] A panel 8 is fixedly installed on the upper end of the upper mold 7, and a mounting groove is opened at the lower end of the pressure plate 5 corresponding to the panel 8. The lower end of the panel 8 is movably abutted with two symmetrically distributed locking plates 9, and the locking plates 9 can move left and right inside the pressure plate 5. The locking plates 9 are provided with a beveled edge portion near the panel 8, which is beneficial for the panel 8 to drive the two locking plates 9 to move away from each other. Two symmetrically distributed springs 10 are fixedly installed on the ends of the two locking plates 9 that are away from each other, and the ends of the springs 10 that are away from the locking plates 9 are fixedly connected to the pressure plate 5.

[0023] Two symmetrically distributed limiting wheels 11 are fixedly installed on the upper end of the locking plate 9, and the limiting wheels 11 are rollingly connected to the pressure plate 5 through rolling grooves. The limiting wheels 11 are used to prevent the locking plate 9 from separating from the pressure plate 5. A connecting rod 12 is also fixedly embedded at the center of the upper end of the locking plate 9. The connecting rod 12 is slidingly connected to the pressure plate 5 through a limiting straight groove, and a diagonal tie rod 13 is movably sleeved on the outer side of the connecting rod 12.

[0024] One end of the inclined rod 13 away from the connecting rod 12 is rotatably connected to an articulated seat 14, a screw 15 is installed at the front end center of the pressure plate 5, a threaded tube 16 is installed on the outer side of the screw 15, and the threaded tube 16 is fixedly embedded in the inside of the screw 15, and a ball 17 is movably embedded at one end of the screw 15 located inside the pressure plate 5, and the connection between the ball 17 and the articulated seat 14 is a movable abutment, and the ball 17 is used to reduce the friction resistance between the screw 15 and the articulated seat 14.

[0025] Working principle: before processing the pipe, the personnel first place the lower die 6 and the upper die 7 at the center of the upper end of the workbench 1, and then position and fix the lower die 6 by the locking nut, and then control the operation of the hydraulic press body 4, the hydraulic press body 4 drives the pressing plate 5 to move downward, and the locking plate 9 moves downward with the pressing plate 5. The panel 8 at the upper end of the upper die 7 drives the two locking plates 9 to move away from each other through the bevel portion. When the panel 8 is completely embedded in the lower end of the pressing plate 5, the two locking plates 9 will be reset under the drive of the compression elastic force of the spring 10. The reset locking plate 9 is located on the lower side of the panel 8, which can prevent the upper die 7 from separating from the pressing plate 5. By installing the same type of panel 8 on the upper side of upper dies 7 of different models, the upper die 7 and the pressing plate 5 can be quickly assembled; When removing the upper die 7, the personnel first controls the hydraulic press body 4 to drive the upper die 7 to move downward and close with the lower die 6. Then the personnel rotates the screw 15. The rotation of the screw 15 can drive the hinge seat 14 to move backward through the ball 17, so that the two locking plates 9 move away from each other until the locking plates 9 are separated from the panel 8. At this time, the upward movement of the pressure plate 5 will not drive the upper die 7 to move. Example 2: Please refer to Figure 3 , Figure 5 , Figure 6 This embodiment further explains Example 1, the oil spray assembly includes two symmetrically distributed bent nozzles 18, the outer side of the bent nozzle 18 is fixedly equipped with a conduit 19 interconnected with the bent nozzle 18, the bent nozzle 18 is used to spray lubricating oil onto the surface of the pipe to be processed, the end of the conduit 19 away from the bent nozzle 18 is fixedly connected to a sleeve 20, the outer side of the sleeve 20 is fixedly equipped with a conduit 21 interconnected with the sleeve 20, both the conduit 19 and the conduit 21 are fixedly equipped with a one-way valve 22, and the end of the sleeve 20 away from the sleeve 20 is fixedly connected to an oil tank 23.

[0026] A piston 24 is movably embedded inside the sleeve 20, and a push rod 25 is fixedly embedded at the center of the lower end of the piston 24. A gasket 26 is fixedly connected to the lower end of the push rod 25, and the lower end surface of the gasket 26 can movably abut against the upper end surface of the pressure plate 5. The gasket 26 can increase the contact surface between the push rod 25 and the pressure plate 5. A spring 27 is movably sleeved on the outer side of the sleeve 20, and the two ends of the spring 27 are movably abutted against the support plate 3 and the gasket 26 respectively.

[0027] A positioning shaft 28 is fixedly passed through the lower ends of the two bending nozzles 18, and the two bending nozzles 18 are rotatably connected to the workbench 1 through the positioning shaft 28. Two movable seats 38 that can move left and right are movably installed on the upper end of the workbench 1, and the two movable seats 38 are located on the left and right sides of the lower mold 6. An abutment seat 39 is rotatably installed on the movable seat 38 through a bearing. The abutment seat 39 is used to abut the end of the pipe. A motor 40 is also fixedly installed on one of the movable seats 38, and the motor 40 can drive the abutment seat 39 to rotate through two gears that cooperate with each other.

[0028] In this embodiment: after the pressing plate 5 moves up and fits with the gasket 26, the personnel places the pipe to be processed on the upper side of the lower mold 6, and abuts the two ends of the pipe through the two abutment seats 39, then the pressing plate 5 moves up against the gasket 26, driving the piston 24 to move up inside the sleeve 20, at this time, under the action of the one-way valve 22, the lubricating oil in the sleeve 20 enters the conduit 19, and is sprayed out through the bending nozzle 18, and the bending nozzle 18 sprays the lubricating oil on the surface of the pipe to be processed, and in the process of the bending nozzle 18 spraying the lubricating oil, the personnel controls the motor 40 to run (the motor 40 can also be controlled by adding a position sensor, because the sensor belongs to the prior art, it is not repeated here), the motor 40 drives the abutment seat 39 to rotate through two mutually matching gears 2, and the abutment seat 39 drives the pipe to rotate, which can make the lubricating oil evenly distributed on the surface of the pipe, can effectively reduce the friction between the pipe and the mold, make the pipe easier to form, and improve the processing efficiency; During the downward movement of the pressure plate 5, the piston 24 will be driven by the compression force of the second spring 27 to move downward and reset. During this process, the lubricating oil in the oil tank 23 is sucked into the sleeve 20 through the second conduit 21. After the upper mold 7 and the lower mold 6 are closed, air is inflated into the interior of the tube through the abutment seat 39 (an air tube is fixedly embedded in the center of the abutment seat 39), so that the tube is expanded and formed inside the mold. Example 3: Please refer to Figure 5 , Figure 7 , Figure 8 This embodiment further explains Example 2. The driving assembly includes a gear 29 fixedly sleeved on the outer center of the positioning shaft 28. A tooth plate 30 is fixedly installed at the rear end center of the pressure plate 5. The front side of the lower end of the tooth plate 30 is provided with a convex tooth that can drive the gear 29 to rotate 90°. The tooth plate 30 is in meshing contact with the gear 29 through a plurality of convex teeth. The tooth plate 30 drives the bending nozzle 18 to rotate through the gear 29.

[0029] Two symmetrically distributed positioning components are installed on the outer side of the positioning shaft 28, and the gear 29 is located between the two positioning components. The positioning component includes a sleeve 31 fixedly sleeved on the outer side of the positioning shaft 28, and a mounting seat 32 is movably sleeved on the outer side of the sleeve 31. The diameter of the sleeve 31 is larger than the diameter of the positioning shaft 28, and the connection between the mounting seat 32 and the workbench 1 is a fixed connection.

[0030] A plurality of embedded tubes 33 equidistantly distributed around the circumference are fixedly embedded inside the mounting seat 32, and a pin rod 34 is movably embedded at one end of the embedded tube 33 close to the sleeve 31, and a hemispherical portion is provided at one end of the pin rod 34 close to the sleeve 31, a blocking piece 35 is fixedly connected to one end of the pin rod 34 located inside the embedded tube 33, and a spring 36 is movably abutted against the side of the blocking piece 35 away from the pin rod 34, and a plurality of hemispherical grooves 37 equidistantly distributed around the circumference are provided on the outside of the sleeve 31, and the pin rod 34 is movably engaged with the hemispherical groove 37 through the hemispherical portion, and the hemispherical portion of the pin rod 34 is embedded in the hemispherical groove 37 for locking the positioning shaft 28.

[0031] In this embodiment: when the pressing plate 5 drives the tooth plate 30 to move downward, the convex teeth on the tooth plate 30 will mesh with the gear 1 29, driving the gear 1 29 and the bending nozzle 18 to rotate 90° clockwise, so that the bending nozzle 18 is turned to the rear side of the workbench 1, which can prevent the bending nozzle 18 from obstructing the upper mold 7 and the lower mold 6 from closing the mold; During the rotation of the bending nozzle 18 and the positioning shaft 28, the hemispherical portion of the pin rod 34 will rotate out of the hemispherical slot 37. When the bending nozzle 18 rotates 90°, the hemispherical portion of the pin rod 34 will be driven by the compression force of the spring three 36 to embed into the corresponding hemispherical slot 37, thereby positioning the bending nozzle 18 and preventing the convex teeth of the tooth plate 30 from disengaging from the gear one 29, and the bending nozzle 18 will continue to rotate under the action of gravity.

[0032] 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.

[0033] 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 superplastic pneumatic forming pipe hydraulic press, comprising a workbench (1), wherein support columns (2) are fixedly installed at the four corners of the upper end of the workbench (1), the upper ends of the support columns (2) are fixedly connected to support plates (3), a hydraulic press body (4) is fixedly embedded on the support plate (3), the lower end of the hydraulic press body (4) is fixedly connected to a pressing plate (5) that can move outside the four support columns (2), a lower die (6) is fixedly installed at the upper end of the workbench (1) through a locking nut, and an upper die (7) is installed on the lower side of the pressing plate (5), characterized in that: Also includes: A locking assembly, used for locking the pressing plate (5) and the upper die (7), the locking assembly being installed inside the pressing plate (5); An oil spray assembly, used for spraying lubricating oil onto the surface of the pipe on the upper side of the lower die (6), the oil spray assembly being mounted on the rear side of the lower die (6); A drive assembly is used to drive the oil injection assembly to rotate, and the drive assembly is installed between the pressure plate (5) and the oil injection assembly.

2. A superplastic bulging forming pipe hydraulic press according to claim 1, characterized in that: A panel (8) is fixedly mounted on the upper end of the upper mold (7); a groove is formed at the lower end of the pressure plate (5) corresponding to the panel (8); two symmetrically distributed locking plates (9) are movably abutted against the lower end of the panel (8); and the locking plates (9) are capable of moving left and right inside the pressure plate (5); a beveled edge is provided on one side of the locking plate (9) close to the panel (8); two symmetrically distributed springs (10) are fixedly mounted on one end of the two locking plates (9) away from each other; and one end of the spring (10) away from the locking plate (9) is fixedly connected to the pressure plate (5).

3. A superplastic bulging forming pipe hydraulic press according to claim 2, characterized in that: Two symmetrically distributed limiting wheels (11) are fixedly mounted on the upper end of the locking plate (9), and a connecting rod (12) is also fixedly embedded at the center of the upper end of the locking plate (9), and a diagonal tie rod (13) is movably sleeved on the outer side of the connecting rod (12).

4. A superplastic bulging forming pipe hydraulic press according to claim 3, characterized in that: One end of the inclined rod (13) away from the connecting rod (12) is rotatably connected to an articulated seat (14), a screw rod (15) is installed at the front end center of the pressure plate (5), a threaded tube (16) is installed on the outer side of the screw rod (15), and the threaded tube (16) is fixedly embedded in the inside of the screw rod (15), and a ball (17) is movably embedded at one end of the screw rod (15) located inside the pressure plate (5), and the connection between the ball (17) and the articulated seat (14) is a movable abutment.

5. The superplastic bulging forming pipe hydraulic press according to claim 1, characterized in that: The oil injection assembly comprises two symmetrically distributed bent spray heads (18); a first conduit (19) in communication with the first conduit (19) is fixedly mounted on the outer side of the bent spray head (18); an end of the first conduit (19) away from the bent spray head (18) is fixedly connected to a sleeve (20); a second conduit (21) in communication with the first conduit (19) is fixedly mounted on the outer side of the sleeve (20); both the first conduit (19) and the second conduit (21) are fixedly mounted with a one-way valve (22); and an end of the sleeve (20) away from the sleeve (20) is fixedly connected to an oil tank (23).

6. A superplastic bulging forming pipe hydraulic press according to claim 5, characterized in that: A piston (24) is movably embedded inside the sleeve (20), a push rod (25) is fixedly embedded at the center of the lower end of the piston (24), a gasket (26) is fixedly connected to the lower end of the push rod (25), and the lower end surface of the gasket (26) can movably abut against the upper end surface of the pressure plate (5), and a spring 2 (27) is movably sleeved on the outer side of the sleeve (20), and the two ends of the spring 2 (27) are movably abutted against the support plate (3) and the gasket (26) respectively.

7. A superplastic bulging forming pipe hydraulic press according to claim 6, characterized in that: A positioning shaft (28) is fixedly passed through the lower ends of the two bending nozzles (18), and the two bending nozzles (18) are rotatably connected to the workbench (1) through the positioning shaft (28). Two movable seats (38) that can move left and right are movably installed on the upper end of the workbench (1), and the two movable seats (38) are located on the left and right sides of the lower mold (6). An abutment seat (39) is rotatably installed on the movable seat (38) through a bearing, and a motor (40) is also fixedly installed on one of the movable seats (38).

8. The superplastic bulging forming pipe hydraulic press according to claim 7, characterized in that: The driving assembly comprises a gear 1 (29) fixedly sleeved at the center of the outer side of the positioning shaft (28); a tooth plate (30) is fixedly installed at the center of the rear end of the pressure plate (5); a convex tooth capable of driving the gear 1 (29) to rotate 90 degrees is arranged on the front side of the lower end of the tooth plate (30); and the tooth plate (30) is in meshing contact with the gear 1 (29) via a plurality of convex teeth.

9. A superplastic bulging forming pipe hydraulic press according to claim 8, characterized in that: Two symmetrically distributed positioning components are installed on the outer side of the positioning shaft (28), and the gear 1 (29) is located between the two positioning components. The positioning component includes a sleeve (31) fixedly sleeved on the outer side of the positioning shaft (28), and a mounting seat (32) is movably sleeved on the outer side of the sleeve (31), and the mounting seat (32) is connected to the workbench (1) in a fixed manner.

10. A superplastic bulging forming pipe hydraulic press according to claim 9, characterized in that: A plurality of embedded tubes (33) are fixedly embedded in the interior of the mounting seat (32) and are equidistantly distributed around the circumference. A pin rod (34) is movably embedded in one end of the embedded tube (33) close to the sleeve (31). A hemispherical portion is provided at one end of the pin rod (34) close to the sleeve (31). A baffle (35) is fixedly connected to one end of the pin rod (34) located inside the embedded tube (33). A spring (36) is movably abutted against the side of the baffle (35) away from the pin rod (34).

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