High-precision pipe plate forming system and process based on electromagnetic-hydraulic cooperation

Abstract

The high-precision forming system comprises an electromagnetic generation module used for generating a high-frequency alternating electromagnetic field to generate electromagnetic force to drive the surface layer of a pipe blank to generate plastic deformation, and a hydraulic driving module outputs controllable pressure based on a servo oil cylinder to conduct deep-layer pressure stabilizing finishing on the pipe blank. The multi-field coupling control module regulates and controls electromagnetic force and hydraulic force in real time based on multi-sensor parameters in combination with a model predictive control algorithm, the auxiliary module is used for providing a non-oxidation forming environment and controlling the system temperature and monitoring the pipe blank deformation state, and the technology comprises the first step of pipe blank treatment and die filling, the second step of electromagnetic preforming and the third step of electromagnetic preforming. Step 3, electromagnetic-hydraulic synergistic finishing, step 4, detection and re-forming treatment, and step 5, forming and annealing treatment. High-precision, high-efficiency and low-energy-consumption forming of the tube plate is achieved through coupling of high-frequency rapid driving of electromagnetic force and deep-layer pressure-stabilizing finishing time sequence of hydraulic force in combination with real-time adjustment of the multi-field coupling control module.

Description

Technical Field

[0001] The present invention relates to the field of equipment technology, and in particular to a high-precision forming system and process for tube sheet parts based on electromagnetic-hydraulic cooperation. Background Art

[0002] Traditional forming processes mainly include cold bending forming, hydraulic forming and hot stamping, but all have limitations. Cold bending forming relies on mold extrusion, which is prone to defects such as rebound and wrinkles. The hydraulic system of hydraulic forming has slow response and long forming cycle. Hot stamping requires high-temperature heating, high energy consumption and severe material oxidation.

[0003] At present, electromagnetic forming has become a popular method for tube sheet forming due to its advantages such as fast response, non-contact and high forming limit. However, the distribution of electromagnetic force is affected by the skin effect and can only act on the surface of the material, resulting in uneven forming of thick-walled parts. At the same time, the energy of a single pulse is limited, resulting in cumulative stress concentration and reduced dimensional accuracy. Therefore, the present invention proposes a high-precision tube sheet forming system and process based on electromagnetic-hydraulic collaboration to solve the problems existing in the prior art. Summary of the Invention

[0004] In response to the above problems, the purpose of the present invention is to propose a high-precision forming system and process for tube sheet parts based on electromagnetic-hydraulic collaboration. The high-precision forming system and process for tube sheet parts based on electromagnetic-hydraulic collaboration achieves high-precision, high-efficiency and low-energy consumption forming of thick-walled / complex-section tube sheet parts through the temporal coupling and spatial coordination of electromagnetic force and hydraulic force.

[0005] To achieve the purpose of the present invention, the present invention is implemented through the following technical solutions: a high-precision forming system for tube sheets based on electromagnetic-hydraulic collaboration, including an electromagnetic generating module, a hydraulic driving module, a multi-field coupling control module and an auxiliary module, the electromagnetic generating module is used to generate a high-frequency alternating electromagnetic field to generate electromagnetic force to drive the surface of the tube blank to undergo plastic deformation, the hydraulic driving module outputs controllable pressure based on the servo cylinder to stabilize and refine the deep layer of the tube blank, the multi-field coupling control module regulates the electromagnetic force and hydraulic pressure in real time based on multi-sensor parameters combined with a model predictive control algorithm, and the auxiliary module is used to provide an oxidation-free forming environment, and to control the system temperature and monitor the deformation state of the tube blank.

[0006] Further improvements are: the electromagnetic generating module includes a pulse control module and a water cooling module. The pulse control module outputs controllable pulses to the induction coil in real time based on the pulse power supply to generate controllable electromagnetic force. The water cooling module is used to control the temperature of the induction coil to maintain the optimal working state.

[0007] Further improvements are as follows: the hydraulic drive module includes a servo oil pressure module and a forming module. The servo oil pressure module accurately controls the dynamic changes of the servo cylinder output pressure based on the proportional servo valve. The forming module is used to combine the driving force of the electromagnetic generating module and the driving force of the servo cylinder to perform forming processing on the tube blank.

[0008] A further improvement is that the multi-field coupling control module includes a sensor module and a compensation adjustment module. The sensor module obtains feedback data in real time based on multiple sensors, and the compensation adjustment module adjusts the electromagnetic pulse parameters and hydraulic pressure through a PLC with an integrated model predictive control algorithm combined with sensor feedback data.

[0009] Further improvements are as follows: the multiple sensors include a high-frequency fluxgate sensor for real-time monitoring of changes in magnetic flux around the magnetic induction coil of the electromagnetic generating module; a hydraulic pressure sensor for detecting the real-time pressure of the hydraulic drive module; a strain gauge for monitoring local strain; and an infrared thermometer for monitoring the surface temperature of the tube blank.

[0010] Further improvements are as follows: the auxiliary module includes a vacuum control module, a laser detection module and a cooling module. The vacuum control module provides a stable vacuum degree for the molding chamber based on a vacuum gauge and a vacuum pump. The laser detection module monitors the deformation size of the tube blank in real time based on a laser rangefinder. The cooling module controls the temperature of the tube blank during molding based on a composite system of air cooling and liquid cooling.

[0011] A forming process of a high-precision tube sheet forming system based on electromagnetic-hydraulic synergy includes the following steps:

[0012] Step 1: Pre-treat the tube blank and place it in the mold cavity. Use the laser detection module to measure and record the parameters of the tube blank. Then preheat the mold to 50-150℃.

[0013] Step 2: Electromagnetic preforming: Start the pulse power supply to output high-frequency alternating current, generate an alternating magnetic field in the magnetic induction coil, induce eddy currents on the surface of the tube, and then generate electromagnetic force, driving the tube to expand radially so that it initially fits the mold cavity contour. This lasts for 50-200ms, completing rapid plastic deformation.

[0014] Step 3: Electromagnetic-hydraulic collaborative finishing. After the tube billet completes rapid plastic deformation, it switches to collaborative mode, maintaining low-frequency electromagnetic pulses to continuously provide surface driving force to suppress rebound deformation. The servo cylinder then pushes the die toward the center to squeeze and compensate for the electromagnetic preforming margin. At the same time, the multi-field coupling control module adjusts the electromagnetic parameters and cylinder pressure parameters according to the multi-sensor feedback parameters, and maintains pressure for 100-500ms to allow the material to fully undergo plastic deformation and stabilize its shape.

[0015] Step 4: Detect the preforming process. After the pressure holding is completed, the hydraulic drive module quickly releases the pressure, the electromagnetic pulse stops, and the laser detection module detects the final size of the tube blank. If the size deviation is greater than ±0.1mm, the closed-loop compensation is triggered, the pulse parameters and hydraulic pressure are adjusted, and the electromagnetic preforming and coordinated finishing are restarted until the size meets the requirements.

[0016] Step 5: Forming annealing treatment. After unloading is completed, the vacuum chamber is released, the tube blank is taken out, and stress relief annealing is performed on the tube blank to eliminate the residual stress generated during the forming process, and finally a high-precision tube sheet is obtained.

[0017] Further improvements are as follows: in the step 1, the tube blank pretreatment is to degrease and clean the tube blank surface to remove surface pollutants; in the step 2, the high-frequency alternating current frequency is 10-50kHz, and the pulse width is 10-100μs; in the step 3, the low-frequency electromagnetic pulse frequency is 1-5kHz, and the pulse width is 50-200μs.

[0018] A further improvement is that the electromagnetic force generated in step 2 is a radial electromagnetic force, which is expressed by the following formula:

[0019] F e =σ·π·D·t·B 2 / (2μ0)

[0020] Where σ is the conductivity of the tube, D is the diameter of the tube, t is the wall thickness of the tube, and B is the magnetic induction intensity.

[0021] The beneficial effects of the present invention are: the present invention solves the problems of uneven forming of thick-walled parts, insufficient precision of complex cross-sections and low efficiency in traditional forming processes through the coupling of high-frequency rapid driving of electromagnetic force and deep voltage stabilization and finishing timing of hydraulic force, combined with real-time adjustment of the multi-field coupling control module, and realizes high-precision, high-efficiency and low-energy consumption forming of tube sheet parts. At the same time, the forming stress concentration is reduced, and the auxiliary vacuum environment makes the material surface free of oxide layer, and no subsequent machining is required. It is suitable for the manufacture of high-end structural parts in the fields of aerospace, new energy vehicles, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a system architecture diagram of the present invention.

[0023] Figure 2 The figure is a flow chart of the process of the present invention. DETAILED DESCRIPTION

[0024] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the examples. The examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0025] Tube sheet parts are core structural components in the fields of machinery, aviation, and automobiles. Their forming accuracy directly affects the performance of the equipment. Traditional forming processes mainly include cold bending, hydraulic forming, and hot stamping, but all have limitations:

[0026] Cold roll forming relies on die extrusion, which is prone to defects such as springback and wrinkles, and is difficult to meet the high precision requirements of thin-walled / complex cross-section tube and sheet parts;

[0027] Hydraulic forming uses liquid pressure to drive the pipe to fit the mold. Although it can reduce wrinkles, the hydraulic system has a slow response (pressure adjustment delay of 0.1-0.5s), a long molding cycle (5-10 minutes per process), and a low molding limit for thick-walled parts.

[0028] Hot stamping requires high temperature heating (800-1200℃), high energy consumption (unit energy consumption 2-5kWh / kg), severe material oxidation, and high subsequent machining costs.

[0029] In recent years, electromagnetic forming (EMF) has been gradually applied to tube and sheet forming due to its advantages of utilizing the Lorentz force to drive material plastic deformation, fast response (microsecond level), non-contact, and high forming limit. However, electromagnetic forming has the following problems:

[0030] (1) The electromagnetic force distribution is affected by the skin effect and can only act on the surface of the material (depth <1mm), resulting in uneven forming of thick-walled parts;

[0031] (2) The energy of a single pulse is limited (usually <10 kJ), and complex cross-sections require multiple pulses, resulting in cumulative stress concentration and reduced dimensional accuracy (deviation ±0.3-0.5 mm).

[0032] according to Figure 1 and Figure 2 As shown, this embodiment provides a high-precision forming system for tube sheets based on electromagnetic-hydraulic collaboration, including an electromagnetic generating module, a hydraulic driving module, a multi-field coupling control module and an auxiliary module. The electromagnetic generating module is used to generate a high-frequency alternating electromagnetic field to generate electromagnetic force to drive the surface of the tube blank to undergo plastic deformation. Specifically, it is generated by a pulse power supply with a peak power of 500-2000kW and a frequency of 1-100kHz in conjunction with an induction coil. The induction coil adopts a copper spiral coil with 5-20 turns and an insulating layer plated on the surface to prevent eddy current loss. The hydraulic driving module outputs controllable pressure based on the servo cylinder to perform deep pressure stabilization and finishing on the tube blank. The multi-field coupling control module regulates the electromagnetic force and hydraulic pressure in real time based on multi-sensor parameters combined with a model predictive control algorithm. The auxiliary module is used to provide an oxidation-free forming environment, and to control the system temperature and monitor the deformation state of the tube blank.

[0033] The electromagnetic generating module includes a pulse control module and a water cooling module. The pulse control module outputs controllable pulses to the induction coil in real time based on the pulse power supply to generate controllable electromagnetic force. The water cooling module is used to control the temperature of the induction coil to maintain the optimal working state. The circulating cooling water flow rate is 10-30L / min, and the water temperature is controlled at 20-25°C.

[0034] The hydraulic drive module includes a servo oil pressure module and a forming module. The servo oil pressure module accurately controls the dynamic changes of the servo cylinder output pressure based on the proportional servo valve. The maximum thrust of the servo cylinder is 500-2000kN, the positioning accuracy is ±0.01mm, and it is distributed along the curvature of the tube section (the cylinder spacing is small and the thrust density is high where the curvature is large). The response frequency of the proportional servo valve is 100-500Hz. The forming module is used to combine the driving force of the electromagnetic generating module and the driving force of the servo cylinder to form the tube, specifically using a forming mold with a hard chrome layer on the surface.

[0035] The multi-field coupling control module includes a sensor module and a compensation adjustment module. The sensor module obtains feedback data in real time based on multiple sensors. The compensation adjustment module adjusts the electromagnetic pulse frequency, pulse width, current parameters and hydraulic pressure through a PLC integrated with a model predictive control algorithm combined with sensor feedback data. The PLC control cycle is 1ms.

[0036] The multiple sensors include a high-frequency fluxgate sensor with a sampling frequency of ≥1MHz, which is used to monitor the changes in magnetic flux around the magnetic induction coil of the electromagnetic generating module in real time; a hydraulic pressure sensor with an accuracy of 0.1% FS (full scale), which is installed at the oil outlet of the servo cylinder and is used to detect the real-time pressure of the hydraulic drive module; a strain gauge with a grid length of 0.5-2mm, which is affixed to key positions on the surface of the tube (such as large deformation areas and corner areas) and is used to monitor local strain; and an infrared thermometer with a response time of ≤1ms, which is used to monitor the surface temperature of the tube.

[0037] The auxiliary module includes a vacuum control module, a laser detection module and a cooling module. The vacuum control module provides a stable vacuum degree for the molding chamber based on a vacuum gauge and a vacuum pump, and the vacuum degree is ≤10Pa. The laser detection module monitors the deformation size of the tube blank in real time based on a laser rangefinder. The laser rangefinder has an accuracy of ±0.005mm and is installed on the top of the chamber. The cooling module controls the temperature of the tube blank during molding to ≤80°C based on a composite system of air cooling and liquid cooling to avoid the degradation of the mechanical properties of the material due to high temperature.

[0038] A forming process of a high-precision tube sheet forming system based on electromagnetic-hydraulic synergy includes the following steps:

[0039] Step 1: Process the tube blank and install it in the mold. Degrease and clean the surface of the tube blank to remove surface contaminants, and place it in the mold cavity. Use the laser detection module to measure the tube blank and record the parameters. Then preheat the mold to 50-150℃.

[0040] Step 2: Electromagnetic preforming: Start the pulse power supply to output a high-frequency alternating current with a frequency of 10-50kHz and a pulse width of 10-100μs. This generates an alternating magnetic field in the magnetic induction coil, which induces eddy currents on the surface of the tube and generates electromagnetic force. This drives the tube to expand radially so that it initially fits the mold cavity contour. This lasts for 50-200ms to complete rapid plastic deformation.

[0041] Step 3: Electromagnetic-hydraulic collaborative finishing. After the tube billet completes rapid plastic deformation, it switches to collaborative mode. A low-frequency electromagnetic pulse with a frequency of 1-5kHz and a pulse width of 50-200μs is maintained to continuously provide surface driving force to suppress rebound deformation. The servo cylinder then pushes the die toward the center to squeeze and compensate for the electromagnetic preforming margin. At the same time, the multi-field coupling control module adjusts the electromagnetic parameters and cylinder pressure parameters according to the multi-sensor feedback parameters, and maintains the pressure for 100-500ms to allow the material to fully undergo plastic deformation and stabilize its shape.

[0042] The electromagnetic force is the radial electromagnetic force, which is expressed by the following formula

[0043] F e =σ·π·D·t·B 2 / (2μ0)

[0044] Where σ is the conductivity of the tube, D is the diameter of the tube, t is the wall thickness of the tube, and B is the magnetic induction intensity.

[0045] Step 4: Detect the preforming process. After the pressure holding is completed, the hydraulic drive module quickly releases the pressure, the electromagnetic pulse stops, and the laser detection module detects the final size of the tube blank. If the size deviation is greater than ±0.1mm, the closed-loop compensation is triggered, the pulse parameters and hydraulic pressure are adjusted, and the electromagnetic preforming and coordinated finishing are restarted until the size meets the requirements.

[0046] Step 5: Forming annealing treatment. After unloading is completed, the vacuum chamber is released, the tube blank is taken out, and stress relief annealing is performed on the tube blank to eliminate the residual stress generated during the forming process, and finally a high-precision tube sheet is obtained.

[0047] Application Example 1

[0048] This embodiment provides a forming process of a high-precision tube sheet forming system based on electromagnetic-hydraulic coordination, which is applied to the forming process of aluminum alloy complex cross-section tubes, including the following steps:

[0049] The aluminum alloy pipe used is grade 6061-T6, with an outer diameter of 80 mm, a wall thickness of 5 mm, a length of 1000 mm, and a target cross-section of "rectangular + arc transition".

[0050] Pretreatment: After the pipe is cleaned with alcohol, it is placed in a vacuum chamber (vacuum degree 8Pa) and the mold is preheated to 80℃;

[0051] Electromagnetic preforming: The pulse power supply outputs a current with a frequency of 20kHz and a pulse width of 50μs. Cooling water (flow rate 20L / min) is passed through the induction coil to generate radial electromagnetic force on the surface of the pipe, driving it to expand to 97% of the target diameter (taking 120ms).

[0052] Collaborative finishing: Switching to collaborative mode, the induction coil outputs current in four segments (the middle two segments have high current density, corresponding to the large deformation area). The servo cylinders are distributed according to the cross-sectional curvature (four cylinders, with a cylinder thrust of 200kN in the area with large curvature and 150kN in the area with small curvature). The pressure is stepped from 10MPa to 25MPa and maintained for 300ms. The MPC algorithm dynamically adjusts the cylinder pressure (deviation ≤±0.3MPa) based on strain gauge feedback (maximum local deformation deviation 0.08mm).

[0053] Unloading and detection: After the pressure is maintained, the pressure is quickly released (40ms), and the laser rangefinder detects the final size (target size Actual size ), meeting the accuracy requirement of ±0.1mm;

[0054] Post-treatment: stress relief annealing (200℃×1h) to obtain high-precision pipe fittings with no surface oxidation and no wrinkles.

[0055] Application Example 2

[0056] This embodiment provides a forming process of a high-precision tube sheet forming system based on electromagnetic-hydraulic coordination, which is applied to the forming process of thick-walled stainless steel plates, including the following steps:

[0057] A 316L stainless steel plate with a thickness of 10 mm, a size of 1000 mm × 800 mm, and a target curvature radius of R500 mm was used.

[0058] Pretreatment: After the plate surface is polished (Ra = 0.8 μm), it is placed in a vacuum chamber (vacuum degree 5 Pa) and the mold is preheated to 120°C;

[0059] Electromagnetic preforming: The pulse power supply output frequency is 10kHz, the pulse width is 100μs, the induction coil is arranged along the length of the plate (with a spacing of 100mm), and the middle of the plate is driven to bend upward to R520mm (reserving a 20mm margin, taking 180ms);

[0060] Collaborative finishing: Eight hydraulic cylinders (uniformly distributed across the width) deliver a pressure of 30 MPa and maintain it for 500 ms. Electromagnetic coils maintain low-frequency pulses (5 kHz) to suppress springback. The MPC algorithm adjusts the pressure of the cylinders on both sides (by increasing by 5 MPa) based on feedback from the laser rangefinder (maximum deviation 0.12 mm). The final curvature radius is R498 ± 0.08 mm.

[0061] Inspection and post-processing: The dimensions meet the requirements, and stress relief annealing (250℃×1.5h) is performed to obtain high-precision curved panels.

[0062] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-precision tube sheet forming system based on electromagnetic-hydraulic synergy, characterized by: It includes an electromagnetic generating module, a hydraulic driving module, a multi-field coupling control module and an auxiliary module. The electromagnetic generating module is used to generate a high-frequency alternating electromagnetic field to generate electromagnetic force to drive the surface of the tube blank to undergo plastic deformation. The hydraulic driving module outputs controllable pressure based on the servo oil cylinder to stabilize and finish the deep layer of the tube blank. The multi-field coupling control module regulates the electromagnetic force and hydraulic pressure in real time based on multi-sensor parameters combined with a model predictive control algorithm. The auxiliary module is used to provide an oxidation-free forming environment, control the system temperature, and monitor the deformation state of the tube blank.

2. The high-precision tube sheet forming system based on electromagnetic-hydraulic coordination according to claim 1, characterized in that: The electromagnetic generating module includes a pulse control module and a water cooling module. The pulse control module outputs controllable pulses to the induction coil in real time based on the pulse power supply to generate controllable electromagnetic force. The water cooling module is used to control the temperature of the induction coil to maintain the optimal working state.

3. The high-precision tube sheet forming system based on electromagnetic-hydraulic coordination according to claim 1, characterized in that: The hydraulic drive module includes a servo oil pressure module and a forming module. The servo oil pressure module accurately controls the dynamic changes of the servo cylinder output pressure based on the proportional servo valve. The forming module is used to combine the driving force of the electromagnetic generating module and the driving force of the servo cylinder to form the tube blank.

4. The high-precision tube sheet forming system based on electromagnetic-hydraulic coordination according to claim 1, characterized in that: The multi-field coupling control module includes a sensor module and a compensation adjustment module. The sensor module obtains feedback data in real time based on multiple sensors. The compensation adjustment module adjusts the electromagnetic pulse parameters and hydraulic pressure through a PLC integrated with a model predictive control algorithm and sensor feedback data.

5. The high-precision tube sheet forming system based on electromagnetic-hydraulic coordination according to claim 4, characterized in that: The multiple sensors include a high-frequency fluxgate sensor for real-time monitoring of changes in magnetic flux around the magnetic induction coil of the electromagnetic generating module; a hydraulic pressure sensor for detecting the real-time pressure of the hydraulic drive module; a strain gauge for monitoring local strain; and an infrared thermometer for monitoring the surface temperature of the tube blank.

6. The high-precision tube sheet forming system based on electromagnetic-hydraulic coordination according to claim 1, characterized in that: The auxiliary module includes a vacuum control module, a laser detection module and a cooling module. The vacuum control module provides a stable vacuum degree for the molding chamber based on a vacuum gauge and a vacuum pump. The laser detection module monitors the deformation size of the tube blank in real time based on a laser rangefinder. The cooling module controls the temperature of the tube blank during molding based on a composite system of air cooling and liquid cooling.

7. A forming process of a high-precision tube sheet forming system based on electromagnetic-hydraulic coordination, characterized in that: The following steps are involved: Step 1: Pre-treat the tube blank and place it in the mold cavity. Use the laser detection module to measure and record the parameters of the tube blank. Then preheat the mold to 50-150℃. Step 2: Electromagnetic preforming: Start the pulse power supply to output high-frequency alternating current, generate an alternating magnetic field in the magnetic induction coil, induce eddy currents on the surface of the tube, and then generate electromagnetic force, driving the tube to expand radially so that it initially fits the mold cavity contour. This lasts for 50-200ms, completing rapid plastic deformation. Step 3: Electromagnetic-hydraulic collaborative finishing. After the tube billet completes rapid plastic deformation, it switches to collaborative mode, maintaining low-frequency electromagnetic pulses to continuously provide surface driving force to suppress rebound deformation. The servo cylinder then pushes the die toward the center to squeeze and compensate for the electromagnetic preforming margin. At the same time, the multi-field coupling control module adjusts the electromagnetic parameters and cylinder pressure parameters according to the multi-sensor feedback parameters, and maintains pressure for 100-500ms to allow the material to fully undergo plastic deformation and stabilize its shape. Step 4: Detect the preforming process. After the pressure holding is completed, the hydraulic drive module quickly releases the pressure, the electromagnetic pulse stops, and the laser detection module detects the final size of the tube blank. If the size deviation is greater than ±0.1mm, the closed-loop compensation is triggered, the pulse parameters and hydraulic pressure are adjusted, and the electromagnetic preforming and coordinated finishing are restarted until the size meets the requirements. Step 5: Forming annealing treatment. After unloading is completed, the vacuum chamber is released, the tube blank is taken out, and stress relief annealing is performed on the tube blank to eliminate the residual stress generated during the forming process, and finally a high-precision tube sheet is obtained.

8. The forming process of the high-precision tube sheet forming system based on electromagnetic-hydraulic coordination according to claim 7, characterized in that: The tube pretreatment in step 1 is to perform degreasing and cleaning on the tube surface to remove surface pollutants; In the step 2, the high-frequency alternating current has a frequency of 10-50 kHz and a pulse width of 10-100 μs; in the step 3, the low-frequency electromagnetic pulse has a frequency of 1-5 kHz and a pulse width of 50-200 μs.

9. The forming process of the high-precision tube sheet forming system based on electromagnetic-hydraulic coordination according to claim 7, characterized in that: The electromagnetic force generated in step 2 is a radial electromagnetic force, which is expressed by the following formula: F e =σ·π·D·t·B 2 / (2m0) Where σ is the conductivity of the tube, D is the diameter of the tube, t is the wall thickness of the tube, and B is the magnetic induction intensity.

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