A large volume tube hydroforming system and method

Abstract

The application discloses a large-volume pipe inner high-pressure forming system and method, relates to the technical field of pipe forming manufacturing, and comprises a mold, a sealing device, a liquid filling system, a pressure boosting system, an unloading system, an oil station driving device, a water tank and a computer control system; the liquid filling system, the pressure boosting system and the unloading system are connected with the oil station driving device and the water tank respectively, and are further connected with the computer control system, thereby forming a complete large-volume rapid compensation inner high-pressure forming system loop. In the pressure boosting forming process, a bidirectional pressure booster is designed, the piston in the oil cylinder is repeatedly reversed, the large-volume pipe can be rapidly compensated in the forming pressure boosting stage, the processing time is shortened, and the forming efficiency is greatly improved. Moreover, a separate unloading system is arranged, the oil circuit has smaller impact risk during unloading, and the service life of the whole system is prolonged.

Description

Technical Field

[0001] This invention relates to the field of pipe forming and manufacturing technology, and in particular to a high-pressure forming system and method for large-volume pipe fittings. Background Technology

[0002] Against the backdrop of a global "dual carbon" strategy, lightweight hollow components are increasingly being used in aerospace, automotive, and other manufacturing sectors to achieve energy conservation and emission reduction. Internal high-pressure forming technology is an advanced forming process for manufacturing these hollow structural components. Compared to more traditional stamping processes, its principle involves applying internal pressure and axial force to the tube, causing it to plastically deform and conform to the mold cavity. The dimensional accuracy of the formed part is then controlled by adjusting the liquid pressure within the tube blank cavity during the forming stage to obtain the desired shape. This technology offers significant advantages in both structural and material lightweighting, not only significantly improving production efficiency but also reducing the weight of parts and enhancing their structural stability.

[0003] With the widespread application of third-generation high-strength steel in the automotive manufacturing industry, further process optimization of large-volume hollow tubular components such as bridge shells, which were originally formed by stamping and welding, has become possible. Internal high-pressure forming technology can achieve integral forming of large-volume hollow tubular components like bridge shells, not only reducing processing steps but also improving the mechanical properties of the workpiece and achieving lightweighting targets. However, under the condition of a fixed volume and a consistent filling rate of the pressurization system, the larger the volume of the component, the longer the pressurization time. Bridge shell components are a large category, which means that a significant amount of time is required for liquid filling in the early stages of forming. Furthermore, because the preform of bridge shell components has a large volume, it will bulge during the pressurization process, further increasing its internal volume. If the liquid is not replenished and pressurized in time, the original liquid pressure in the cavity will further decrease, failing to reach the internal pressure required for forming, leading to failures such as buckling. This easily results in longer pressurization time for forming bridge shell components, lower forming efficiency, and a significant extension of the production cycle. Therefore, there is an urgent need for a pressurization system to achieve rapid pressure compensation during forming. Meanwhile, in the final unloading stage, conventional internal high-pressure forming systems achieve unloading through a booster. However, the booster is highly susceptible to fluid pressure shocks during unloading, thus reducing its service life. These issues are technical problems that urgently need to be solved in the field of internal high-pressure forming of large-volume pipe fittings. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a high-pressure forming system and method for large-volume tubular components.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] A high-pressure forming system for large-volume pipe fittings includes: a mold, a sealing device, a filling system, a pressurizing system, an unloading system, a fuel station drive unit, a water tank, and a computer control system.

[0007] The mold is used to place the pipe fittings, and the sealing device is installed on the mold at both ends of the pipe fittings; the oil station drive device and the water tank are both connected to the filling system, the pressurization system, the unloading system and the computer control system;

[0008] During the filling phase, the computer control system sends commands to the water tank and the oil station drive device to drive the filling system to inject fluid medium into the inner cavity of the pipe fitting.

[0009] During the pressurization phase, the computer control system sends commands to the water tank and the oil station drive device to drive the pressurization system to pressurize the pipe fittings;

[0010] During the unloading phase, the computer control system sends commands to the water tank and the oil station drive unit to drive the unloading system to depressurize the pipe fittings.

[0011] To achieve the above objectives, the present invention also provides the following solution:

[0012] A method for high-pressure forming of large-volume pipe fittings, the method being applied to the aforementioned high-pressure forming system for large-volume pipe fittings, the method comprising:

[0013] During the filling stage, the pipe to be processed is placed into the mold, and both ends of the pipe are sealed by a sealing device. The fluid medium is then filled into the inner cavity of the pipe through the filling system.

[0014] During the pressurization phase, the computer control system issues a command to start the bidirectional pressurizer. The piston rod of the bidirectional pressurizer drives the piston to move repeatedly, and obtains a high-pressure fluid medium by squeezing the liquid in the cylinder of the bidirectional pressurizer, thereby squeezing the high-pressure fluid medium in the water tank into the pipe.

[0015] During the unloading phase, the computer control system issues a command to start the one-way booster, switch the second solenoid directional valve, and retract the piston of the one-way booster to relieve pressure.

[0016] Remove the fitting after the shaping is complete.

[0017] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0018] This invention employs a bidirectional intensifier during the pressurization process. By utilizing the repeated reversal of the piston within the cylinder, large-volume tubular components can undergo rapid pressurization compensation during the pressurization stage, shortening processing time and significantly improving production efficiency. Furthermore, this invention incorporates a separate unloading system, preventing impact damage to the intensifier during unloading. This reduces the risk of impact on the hydraulic circuit during unloading, decreases the frequency of component damage, lowers production costs, and extends the overall system lifespan. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 The structural diagram of the high-pressure forming system for large-volume pipe fittings provided by the present invention;

[0021] In the diagram, 1-mold, 2-pipe fitting, 3-sealing device, 4-two-way booster, 5-one-way booster, 6-first one-way valve, 7-second one-way valve, 8-one-way throttle valve, 9-hydraulic directional valve, 10-first solenoid directional valve, 11-second solenoid directional valve, 12-first overflow valve, 13-second overflow valve, 14-third overflow valve, 15-fourth overflow valve, 16-fifth overflow valve, 17-first metering pump, 18-second metering pump, 19-third metering pump, 20-fourth metering pump, 21-fifth metering pump, 22-oil station drive unit, 23-water tank, 24-computer control system. Detailed Implementation

[0022] 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.

[0023] The purpose of this invention is to provide a high-pressure forming system and method for large-volume pipe fittings. For large-volume hollow pipe fittings, this invention can rapidly replenish liquid and increase pressure without interruption, effectively reducing the production cycle between the liquid filling stage and the forming stage, and making the forming pressure more stable. This provides a technical path for achieving low-energy consumption and fast-paced green manufacturing of large-volume hollow components.

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] like Figure 1 As shown, the high-pressure forming system for large-volume pipe fittings provided in this embodiment includes: a mold 1, a sealing device 3, a liquid filling system, a pressurization system, an unloading system, a fuel station drive device 22, a water tank 23, and a computer control system 24.

[0026] Among them, the pipe fitting 2 is placed inside the mold 1, and the sealing device 3 is installed on the mold and located at both ends of the pipe fitting.

[0027] The first overflow valve 12 and the first metering pump 17 are connected in parallel to form a rapid filling system.

[0028] The system consists of a bidirectional booster 4 connected to a hydraulic directional valve 9, which in turn is connected to a first solenoid directional valve 10. A one-way throttle valve 8 is connected in series in between. A second overflow valve 13 is connected in parallel with a second metering pump 18 and then connected in series with a first one-way valve 6. The first one-way valve 6 is also connected to the bidirectional booster 4. A third overflow valve 14 is connected in parallel with a third metering pump 19 and then connected to the bidirectional booster 4 and the hydraulic directional valve 9, respectively. These components together form a rapid boosting system.

[0029] Among them, the one-way booster 5 is connected to the second solenoid reversing valve 11, the fourth overflow valve 15 is connected in parallel with the fourth metering pump 20, the fifth overflow valve 16 is connected in parallel with the fifth metering pump 21 and then connected in series with the second one-way valve 7. The above components form an unloading system.

[0030] It should be noted that the first metering pump 17, used for rapidly filling the inner cavity of pipe fitting 2, the second metering pump 18, used for continuously pressurizing the inner cavity of pipe fitting 2, and the fifth metering pump 21, used for unloading from the inner cavity of pipe fitting 2, are all connected to the water tank 23. The third metering pump 19, used for injecting hydraulic oil into the large-section dual-chamber of the bidirectional booster 4, and the fourth metering pump 20, used for injecting hydraulic oil into the large-section dual-chamber of the unidirectional booster 5, are all connected to the oil station drive unit 22.

[0031] The filling system, pressurization system, and unloading system are then connected to the oil station drive unit 22 and water tank 23, respectively, and then connected to the computer control system 24 to form a complete large-volume rapid compensation internal high-pressure forming system circuit. The one-way valves in the filling system, pressurization system, and unloading system all perform the basic function of one-way passage and reverse containment, while the overflow valves all perform the function of unloading to protect the fluid pressure in the branch from exceeding the set value.

[0032] The function of the computer control system 24 is to control the operation of the internal high-pressure forming system according to the pre-set program. The computer control system 24 mainly displays the changes in data from various parts and the overall system flow. It allows for convenient setting of initial internal pressure, axial feed, and other data on the computer control system 24, and also allows viewing the operating conditions of various hardware and software components. It can dynamically display the changes in various data during processing, facilitate easy modification of experimental data, and intuitively display the work progress.

[0033] The working principle of the high-pressure forming system for large-volume tubing provided in this embodiment is as follows:

[0034] During the filling stage, the pipe fitting 2 to be processed is first placed in the expansion forming mold 1. The mold 1 is closed and locked using a hydraulic press. Before the internal high-pressure forming begins, the filling system performs pre-forming filling. Specifically, the computer control system 24 sends instructions to the water tank 23 and the oil station drive device 22 to drive the first quantitative pump 17 to rapidly inject fluid medium into the inner cavity of the pipe fitting 2 through a high-flow pipeline. The sealing devices 3 on both sides of the pipe end move towards each other, forming a closed and complete cavity with the pipe fitting 2, achieving a staged seal. At the same time, the sealing devices 3 cut off the originally connected high-flow rapid filling hole of the mold 1. The computer control system 24 also sends instructions to the oil station drive device 22 at this time to stop the operation of the filling system. When the fluid pressure in the filling system exceeds the set value, the first overflow valve 12 is activated to unload and protect the filling system from overload.

[0035] During the pressurization phase, pressurization is achieved through the pressurization system. The computer control system 24 sends commands to the water tank 23 and the oil station drive device 22. The third quantitative pump 19 injects hydraulic oil into the first solenoid directional valve 10 and the hydraulic directional valve 9, respectively. Under the command of the computer control system 24, the first solenoid directional valve 10 performs the left-position function, and under the action of the one-way throttle valve 8, the hydraulic directional valve 9 performs the left-position function. That is, the hydraulic oil from the third quantitative pump 19 is injected into the left large cross-section chamber of the bidirectional pressurizer 4. Under the pressure of the left large cross-section chamber, the piston rod moves to the right, and the right large cross-section chamber of the bidirectional pressurizer 4 discharges oil outward. At the same time, the right small cross-section chamber injects high-pressure fluid medium from the second quantitative pump 18 into the inner cavity of the pipe fitting 2 through the sealing device 3. When the computer control system 24 detects that the piston rod has moved to the right, the first electromagnetic directional valve 10 performs its right-position function under the instruction of the computer control system 24. Under the action of the one-way throttle valve 8, the hydraulic directional valve 9 performs its right-position function, that is, the hydraulic oil of the third quantitative pump 19 is injected into the right large cross-section chamber of the bidirectional booster 4. Under the pressure of the right large cross-section chamber, the piston rod moves to the left, and the left large cross-section chamber of the bidirectional booster 4 discharges oil outward. At the same time, the left small cross-section chamber injects high-pressure fluid medium from the second quantitative pump 18 into the inner cavity of the pipe fitting 2 through the sealing device 3. The above is one set of boosting reciprocating cycles. Under multiple sets of boosting reciprocating cycles, the inner cavity of the pipe fitting 2 is rapidly and continuously boosted without interruption. Thus, under the combined action of the mold 1 and the fluid pressure in the inner cavity, the pipe fitting 2 completes stable and continuous bulging and molding.

[0036] When the fluid pressure in the large-section cavity of the booster system exceeds the set value, the second relief valve 13 activates to protect the booster system from overload; when the fluid pressure in the small-section cavity of the booster system exceeds the set value, the third relief valve 14 activates to protect the booster system from overload. 。

[0037] During the unloading phase, the computer control system 24 sends commands to the water tank 23 and the oil station drive device 22. The fourth quantitative pump 20 injects hydraulic oil into the second solenoid directional valve 11. Under the command of the computer control system 24, the second solenoid directional valve 11 performs its right-hand function, that is, the hydraulic oil from the fourth quantitative pump 20 is injected into the large-section rod chamber of the one-way booster 5. Under the pressure of the large-section rod chamber, the piston rod moves downward, and the large-section rodless chamber of the one-way booster 5 discharges oil outward. At the same time, the inner cavity of the pipe fitting 2 is injected with high-pressure fluid medium into the small-section chamber of the one-way booster 5 through the sealing device 3. As the fluid medium is injected, the pressure in the inner cavity of the pipe fitting 2 gradually decreases until the internal pressure is zero, thus completing the unloading process. When the computer control system 24 detects that the pressure in the inner cavity of the pipe fitting 2 is zero, it drives the sealing device 3 to reset, and the pipe fitting is removed after the mold is opened.

[0038] To ensure a stable decrease in internal pressure, when the fluid pressure in the small-section cavity of the one-way booster 5 drops below the output pressure of the fifth metering pump 21, the fifth metering pump 21 injects a certain amount of fluid medium into the small-section cavity of the one-way booster 5. Under the action of the second one-way valve 7, the fluid medium can only be injected into the small-section cavity of the one-way booster 5 by the fifth metering pump 21 and cannot flow back to the fifth metering pump 21. The fluid pressure in the small-section cavity of the one-way booster 5 drops to zero, completing the unloading process. Specifically, when the fluid pressure in the large-section cavity of the unloading system exceeds the set value, the fourth relief valve 15 activates unloading to protect the unloading system from overload; when the fluid pressure in the small-section cavity of the unloading system exceeds the set value, the fifth relief valve 15 activates unloading to protect the unloading system from overload.

[0039] In view of the above-mentioned high-pressure forming system for large-volume pipe fittings, this embodiment also provides a method for high-pressure forming of large-volume pipe fittings, which includes the following steps:

[0040] S1: During the liquid filling stage, the pipe fitting 2 to be processed is placed into the mold 1. Both ends of the pipe fitting 2 are sealed by the sealing device 3, and the fluid medium is filled into the inner cavity of the pipe fitting 2 through the liquid filling system.

[0041] This step is to ensure accurate control of the liquid pressure inside the mold cavity during the subsequent pressurization stage, thereby improving the molding precision.

[0042] S2: During the pressurization stage, the computer control system 24 issues a command to start the bidirectional pressurizer 4. The piston rod of the bidirectional pressurizer 4 drives the piston to move repeatedly, and obtains a high-pressure fluid medium by squeezing the liquid in the cylinder of the bidirectional pressurizer 4, thereby squeezing the high-pressure fluid medium in the water tank 23 into the pipe 2.

[0043] The forming stage, also known as the pressurization stage, is the core and key of the internal high-pressure forming system. This stage primarily aims to provide the billet with the hydraulic pressure required for expansion, allowing the pipe fitting 2 to complete the internal high-pressure expansion process under the combined action of the mold 1 and the internal pressure medium, thereby obtaining the desired pipe fitting 2. The pressurization device designed for the pressurization stage is a bidirectional pressurizer 4. This is because the bidirectional pressurizer 4 can repeatedly change direction via the piston, quickly driving the hydraulic oil for rapid compensation, greatly shortening the time spent in the pressurization process. Electro-hydraulic directional valves (hydraulic directional valve 9 and solenoid directional valve 10) are used to control the pressure. These valves can both realize the reciprocating direction of the piston and ensure smooth changes in pressure.

[0044] S3: During the unloading phase, the computer control system 24 issues a command, and the one-way booster 5 starts after receiving the unloading signal. The second electromagnetic reversing valve 11 quickly reverses, and the piston of the one-way booster 5 quickly retracts to relieve pressure.

[0045] S4: Remove the pipe after the shaping is complete.

[0046] The present invention achieves the following beneficial technical effects compared to the prior art:

[0047] (1) This invention employs a bidirectional booster, which enables rapid system pressurization and compensation, avoiding idle strokes during booster operation. It also ensures the advantages of low cost, high precision, and stable quality in the internal high-pressure processing technology. This further shortens forming time, achieves energy conservation and emission reduction, and improves the production efficiency of large-volume pipe fittings.

[0048] (2) For the selection of the reversing valve in the two-way booster, an electro-hydraulic reversing valve is selected. This reversing valve has the characteristics of high efficiency, easy maintenance, stable pressure and fast response. This reversing valve also has good flow control performance, which can accurately control the flow rate and improve the accuracy of pipe forming.

[0049] (3) Conventional high-pressure forming systems unload through a booster, which poses a risk of unloading impact and significantly reduces their service life. This invention, however, features a dedicated unloading device. Upon receiving an unloading command, the unloading device in the unloading system activates, instead of unloading through the booster in the booster system. Therefore, during unloading, the high-pressure liquid in the pipes is unloaded via the unloading circuit within the unloading system, without immediately impacting the bidirectional booster. This reduces the impact risk on the bidirectional booster, lowers the system's failure frequency, and extends the service life of the forming system.

[0050] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A high-pressure forming system for large-volume tubular fittings, characterized in that, include: Molds, sealing devices, filling systems, pressurization systems, unloading systems, fuel station drive units, water tanks, and computer control systems; The mold is used to place the pipe fitting, and the sealing device is disposed on the mold and located at both ends of the pipe fitting; The gas station drive unit and the water tank are both connected to the filling system, the pressurization system, the unloading system, and the computer control system; During the filling phase, the computer control system sends commands to the water tank and the oil station drive device to drive the filling system to inject fluid medium into the inner cavity of the pipe fitting. During the pressurization phase, the computer control system sends commands to the water tank and the oil station drive device to drive the pressurization system to pressurize the pipe fittings; During the unloading phase, the computer control system sends instructions to the water tank and the oil station drive device to drive the unloading system to depressurize the pipe fittings; The unloading system includes: a one-way booster, a second one-way valve, a second solenoid directional valve, a fourth overflow valve, a fifth overflow valve, a fourth metering pump, and a fifth metering pump; The one-way booster is connected to the pipe fitting, the second solenoid directional valve, and one end of the second one-way valve respectively. The fourth overflow valve is connected in parallel with the fourth metering pump and then connected to the second solenoid directional valve. The fifth overflow valve is connected in parallel with the fifth metering pump and then connected to the other end of the second one-way valve. The fourth overflow valve and the fourth metering pump are also connected to the gas station drive device. The fifth overflow valve and the fifth metering pump are also connected to the water tank. During the unloading phase, the computer control system sends instructions to the water tank and the oil station drive device to drive the fourth quantitative pump to inject hydraulic oil into the second electromagnetic directional valve. Under the instructions of the computer control system, the second electromagnetic directional valve performs its right-hand function, and the hydraulic oil is injected into the large-section rod chamber of the one-way intensifier. Under the pressure of the large-section rod chamber, the piston rod of the one-way intensifier moves downward, and the large-section rodless chamber of the one-way intensifier discharges oil outward. At the same time, the inner cavity of the pipe is injected with high-pressure fluid medium into the small-section chamber of the one-way intensifier through the sealing device. As the fluid medium is injected, the pressure in the inner cavity of the pipe gradually decreases until the internal pressure is zero, thus completing the unloading process. Specifically, when the fluid pressure in the small cross-section cavity of the one-way booster drops below the output pressure of the fifth metering pump, the fifth metering pump injects a certain amount of fluid medium into the small cross-section cavity of the one-way booster. Under the action of the second one-way valve, the fluid medium can only be injected into the small cross-section cavity of the one-way booster by the fifth metering pump and cannot flow back to the fifth metering pump. When the fluid pressure in the large cross-section cavity of the unloading system exceeds the set value, the fourth overflow valve starts unloading to protect the unloading system from overload. When the fluid pressure in the small cross-section cavity of the unloading system exceeds the set value, the fifth overflow valve starts unloading to protect the unloading system from overload.

2. The high-pressure forming system for large-volume tubular fittings according to claim 1, characterized in that, The filling system includes: a first overflow valve and a first metering pump; one end of the first overflow valve and one end of the first metering pump are both connected to the pipe fitting, and the other end of the first overflow valve and the other end of the first metering pump are both connected to the gas station drive device and the water tank; During the filling stage, the computer control system sends instructions to the water tank and the oil station drive device to drive the first metering pump to inject fluid medium into the inner cavity of the pipe fitting; when the fluid pressure in the filling system exceeds the set value, the first overflow valve is activated to unload and protect the filling system from overload.

3. The high-pressure forming system for large-volume tubular fittings according to claim 1, characterized in that, The booster system includes: a two-way booster, a first one-way valve, a one-way throttle valve, a hydraulic directional valve, a first solenoid directional valve, a second overflow valve, a third overflow valve, a second metering pump, and a third metering pump; The bidirectional booster is connected to one end of the first one-way valve and the hydraulic directional valve, respectively. The other end of the first one-way valve is connected to one end of the second overflow valve and one end of the second metering pump, respectively. The other ends of the second overflow valve and the second metering pump are both connected to the water tank. A one-way throttle valve is installed on the pipeline connecting the hydraulic directional valve and the first electromagnetic directional valve. The hydraulic directional valve and the first electromagnetic directional valve are also connected to one end of the third overflow valve and one end of the third metering pump, respectively. The other ends of the third overflow valve and the third metering pump are both connected to the gas station drive device. During the pressurization phase, the computer control system sends commands to the water tank and the oil station drive device, driving the third quantitative pump to inject hydraulic oil into the first electromagnetic directional valve and the hydraulic directional valve respectively. Under the command of the computer control system, the first electromagnetic directional valve performs a left-position function, and under the action of the one-way throttle valve, the hydraulic directional valve performs a left-position function. Hydraulic oil is injected into the left large-section chamber of the bidirectional booster. Under the pressure of the left large-section chamber, the piston rod of the bidirectional booster moves to the right, and the right large-section chamber of the bidirectional booster discharges oil outward. Simultaneously, the right small-section chamber of the bidirectional booster discharges oil into the pipe through the sealing device. High-pressure fluid medium from the second metering pump is injected into the chamber; when the computer control system detects that the piston rod of the bidirectional booster has moved to the right position, the first electromagnetic reversing valve performs the right-position function under the instruction of the computer control system, and the hydraulic reversing valve performs the right-position function under the action of the one-way throttle valve, and hydraulic oil is injected into the right large cross-section chamber of the bidirectional booster. Under the pressure of the right large cross-section chamber, the piston rod of the bidirectional booster moves to the left, and the left large cross-section chamber of the bidirectional booster discharges oil outward. At the same time, the left small cross-section chamber of the bidirectional booster injects high-pressure fluid medium from the second metering pump into the inner cavity of the pipe through the sealing device. When the fluid pressure in the large cross-section cavity of the booster system exceeds the set value, the second relief valve is activated to protect the booster system from overload; when the fluid pressure in the small cross-section cavity of the booster system exceeds the set value, the third relief valve is activated to protect the booster system from overload.

4. A method for high-pressure forming of large-volume tubular fittings, characterized in that, The method is applied to the high-pressure forming system for large-volume tubular components according to claim 3, and the method includes: During the filling stage, the pipe to be processed is placed into the mold, and both ends of the pipe are sealed by a sealing device. The fluid medium is then filled into the inner cavity of the pipe through the filling system. During the pressurization phase, the computer control system issues a command to start the bidirectional pressurizer. The piston rod of the bidirectional pressurizer drives the piston to move repeatedly, squeezing the liquid in the cylinder of the bidirectional pressurizer, thereby squeezing the high-pressure fluid medium in the water tank into the pipe. During the unloading phase, the computer control system issues a command to start the one-way booster, switch the second solenoid directional valve, and retract the piston of the one-way booster to relieve pressure. Remove the fitting after the shaping is complete.

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