Device and method for eliminating residual stress of high-strength titanium tube through pulse electromagnetic force

Abstract

The invention discloses a method and a device for eliminating residual stress of a high-strength titanium pipe through pulse electromagnetic force, relates to the field of metal pipe machining, and aims to effectively reduce or eliminate internal residual stress generated in the bending and instantaneous springback process of the pipe so as to eliminate the problem of lagged springback. The device mainly comprises an electric pulse generating device 1, an annular pulse electromagnetic force generating device 2 and an intelligent moving device 3. Pulse electromagnetic force acts on the inner wall of the pipe, so that plastic deformation occurs in a local high-stress area of the pipe, and the purposes of relaxation and reduction of residual stress are achieved; meanwhile, a certain low-frequency oscillating force is provided for the pipe by utilizing the oscillating electromagnetic force generated by the gradually attenuated fluctuation characteristic presented by the pulse current in the later stage of discharge. The additional oscillating force is superposed with the original residual stress of the workpiece to form a driving force for promoting plastic deformation, and plastic deformation is generated in a local high-stress area to reduce the residual stress. The method can greatly reduce the residual stress of the pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe processing, in particular to a device for eliminating residual stress of high-strength titanium pipe by pulse electromagnetic force. BACKGROUND

[0002] The bent pipe component plays a crucial role in the key pipeline systems of aerospace equipment such as fuel / oil, aerodynamics, environmental control, and hydraulic pressure, and is responsible for medium transmission, structural bearing, and weight reduction and energy saving, and is known as the "blood vessel" lifeline of the aircraft and engine. In view of its key position in the system, the bent pipe component needs to meet higher performance standards, especially in terms of high pressure resistance, lightweight, high reliability, and long service life. Therefore, it is urgent to replace the traditional high-strength steel pipe with high-strength titanium alloy pipe (HSTT). This new type of pipe material significantly improves the overall performance of the bent pipe component due to its lightweight, high strength, excellent corrosion resistance, and fatigue resistance.

[0003] In order to efficiently and accurately manufacture bent pipe components, a compact and efficient small bending radius integrated design is required. However, in the bending forming process of metal pipes, springback is inevitable. Springback can be divided into two types: one is the instantaneous springback that occurs immediately after unloading and is independent of time; the other is the hysteresis springback that gradually appears over time. Due to the high elastic-plastic ratio of titanium alloy pipes, the instantaneous springback after forming and unloading is particularly obvious, and the bending section usually has high residual stress. These residual stresses cause the bent pipe component to change over time, which seriously affects the forming accuracy of the component and may pose a potential risk to the secondary processing, connection assembly, and service safety of the bent pipe component.

[0004] Therefore, how to effectively reduce or eliminate the internal residual stress generated in the bending and instantaneous springback process of the pipe is a scientific problem that needs to be solved. The solution to this problem has important engineering application value for realizing the precise forming, stress-free assembly, and prolonging the service life of the pipe component, and has important significance for promoting the development of the aerospace equipment field. SUMMARY

[0005] In view of this, the present application provides a device for eliminating residual stress of high-strength titanium pipe by pulse electromagnetic force, which aims to solve the problem of hysteresis springback caused by residual stress of bent pipe 6 in the current technology, thereby affecting pipe assembly and reducing service life.

[0006] According to one aspect of the present application, a device for eliminating residual stress of high-strength titanium pipe by pulse electromagnetic force is provided, which comprises an electric pulse generating device 1, a ring-shaped pulse electromagnetic force generating device 2, an intelligent moving device 3, a control system 4, and a pipe placing device 5.

[0007] The electric pulse generating device 1 is used to provide an electric pulse signal for the annular pulse electromagnetic force generating device 2.

[0008] The annular pulse electromagnetic force generating device 2 is used to generate a pulse electromagnetic force and act on the curved pipe 6.

[0009] The intelligent mobile device 3 is used to adjust the motion trajectory of the pulse electromagnetic force acting device.

[0010] The control system 4 is used to coordinate the working time sequence and parameters of the electric pulse generating device 1 and display the temperature change information in real time.

[0011] The pipe placing device 5 is used to fix and support the curved pipe 6 to be processed.

[0012] The curved pipe 6 is a titanium alloy pipe.

[0013] The electric pulse generating device 1 comprises an electric pulse power supply 101, a step-up transformer 102, a rectifier bridge 103, a charging switch 104, a switch driver 105, a capacitor bank 106, a discharge switch 107, and a discharge electrode 108.

[0014] The electric pulse power supply 101 is connected to the capacitor bank 106 through the step-up transformer 102 to provide the required charging voltage for the capacitor bank 106.

[0015] The rectifier bridge 103 is arranged between the step-up transformer 102 and the charging switch 104, and is used to convert the alternating voltage output by the step-up transformer 102 into direct current voltage to provide a stable charging voltage for the capacitor bank 106.

[0016] The charging switch 104 is arranged between the capacitor bank 106 and the electric pulse power supply 101, and is used to control the charging process of the capacitor bank 106.

[0017] The discharge switch 107 is arranged between the capacitor bank 106 and the discharge electrode 108, and is used to control the discharging process of the capacitor bank 106.

[0018] The capacitor bank 106 is connected to the charging switch 104, the discharge switch 107, and the discharge electrode 108 to form a discharge circuit.

[0019] The switch driver 105 is connected to the control system 4 to control the on-off of the charging switch 104 and the discharge switch 107.

[0020] The discharge electrode 108 is connected to the annular pulse electromagnetic force generating device 2.

[0021] The energy stored in the capacitor bank 106 is applied to the discharge electrode 108 in the form of electric pulses to generate electromagnetic force.

[0022] The annular pulse electromagnetic force generating device 2 comprises a coil framework 201, an electromagnetic coil 202, and a coil grid 203, all of which are made of insulating epoxy resin material.

[0023] The coil framework 201 is used to tightly wind the electromagnetic coil 202 on the coil grid 203, and the electromagnetic coil 202 wound on the coil grid 203 is reinforced with carbon fiber.

[0024] The electromagnetic coil 202 is made of copper wire with good electrical conductivity, which is used to receive the current generated by the electric pulse generating device 1.

[0025] The intelligent mobile device 3 comprises a framework 301, a roller 302, and an intelligent controller 303.

[0026] The framework 301 is used to support the annular pulse electromagnetic force generating device 2.

[0027] The roller 302 is used to drive the movement of the framework 301 and the annular pulse electromagnetic force generating device 2.

[0028] The intelligent controller 303 is used to adjust the motion trajectory of the intelligent mobile device 3, so as to ensure that the motion trajectory is consistent with the axis trajectory of the curved pipe 6.

[0029] The control system 4 is composed of a controller 401 and a human-computer interaction interface 402.

[0030] The controller 401 sets the working parameters of the electric pulse generating device 1 according to the size of the curved pipe 6 and the distribution of residual stress.

[0031] The working parameters include the voltage, frequency, and pulse width of the electric pulse signal.

[0032] The control system 4 is also connected with the temperature monitoring device in the pipe placing device 5, which is used to monitor the temperature change information of the curved pipe 6 in the processing process in real time. The control system 4 adjusts the working parameters of the electric pulse generating device 1 in real time according to the received temperature change information.

[0033] The human-computer interaction interface 402 is used to receive the instructions and parameters input by the user, and to display the process information of the pulse electromagnetic force eliminating the residual stress of the curved pipe 6 and the temperature change information in real time.

[0034] The pipe placing device 5 comprises a clamping mechanism 501, a lifting rod 502, and a base 503.

[0035] The clamping mechanism 501 is provided with two, made of insulating epoxy resin, arranged on the lifting rod 502, used for fixing and clamping the bent pipe 6, and the two clamping mechanisms 501 are clamped at both ends of the bent pipe 6;

[0036] The lifting rod 502 is used for adjusting the height of the pipe to ensure that its axis is coaxial with the axis of the annular pulse electromagnetic force generating device 2;

[0037] The base 503 is used for stable support of the entire pipe placing device 5.

[0038] The central axis of the bent pipe 6 is coaxial with the annular pulse electromagnetic force generating device 2, which is installed on the skeleton 301 of the intelligent mobile device 3 with the roller 302, and the bent pipe 6 is horizontally fixed on the pipe placing device 5.

[0039] The controller 401 includes a central processor and an electric pulse control module; the central processor is connected with the electric pulse control module, and the central processor is used for controlling the working state of the electric pulse generating device 1 according to the pre-set working time sequence and parameters.

[0040] The electric pulse generating device 1 further includes a voltage regulator and a waveform adjuster;

[0041] The voltage regulator is connected between the electric pulse power supply 101 and the step-up transformer 102, used for adjusting the charging voltage output by the step-up transformer 102 according to the instruction of the central processor; the waveform adjuster is connected between the capacitor group 106 and the switch, used for adjusting the waveform characteristics when the capacitor group 106 discharges according to the instruction of the central processor.

[0042] According to another aspect of the present application, a method for eliminating residual stress of high-strength titanium pipe by pulse electromagnetic force is provided, using the above device;

[0043] Including the following steps:

[0044] The residual stress of the bent pipe 6 is preliminarily detected by using a stress testing device, and the stress distribution data is obtained; the detected stress distribution data is input into the control system 4, the stress conditions of different parts of the bent pipe 6 are analyzed, and the stress concentration area and the stress gradient change are determined;

[0045] According to the geometric size and stress distribution data of the bent pipe 6, the working parameters of the electric pulse signal are calculated;

[0046] The electric pulse generator 1 is started to charge the capacitor bank 106 to a preset voltage; when the capacitor bank 106 is fully charged, the controller 401 controls the charging switch 104 and the discharging switch 107 to act, so that the capacitor bank 106 discharges to the electromagnetic coil 202 through the discharge electrode 108;

[0047] When the current passes through the pulse magnet, a strong pulse magnetic field is generated, which induces eddy currents in the curved pipe 6, thereby generating a pulse electromagnetic force acting on the surface of the curved pipe 6, improving the stress distribution inside the curved pipe 6 and reducing the level of residual stress;

[0048] When the treatment reaches the preset target effect, the control system 4 automatically turns off the electric pulse generator 1, and the entire treatment process is completed.

[0049] The control system 4 adjusts the working parameters of the electric pulse generator 1 according to the real-time feedback stress data to realize precise control of residual stress.

[0050] The geometric dimensions of the curved pipe 6 include diameter, wall thickness and bending radius.

[0051] The calculation formula of the working parameters of the electric pulse signal includes:

[0052] The calculation formula of the voltage of the electric pulse signal is:

[0053]

[0054] Wherein, Vp is the voltage of the electric pulse signal, k1 is the material constant, σ max is the detected maximum residual stress, t is the wall thickness of the pipe;

[0055] The calculation formula of the frequency of the electric pulse signal is:

[0056]

[0057] Wherein, Fp is the frequency of the electric pulse signal, k2 is the adjustment constant, D is the diameter of the pipe;

[0058] The calculation formula of the pulse width of the electric pulse signal is:

[0059]

[0060] Wherein, Tp is the pulse width of the electric pulse signal, k3 is the adjustment constant.

[0061] The control system 4 adjusts the working parameters of the electric pulse generator 1 in real time according to the received temperature change information; the real-time adjustment method includes:

[0062] When the temperature exceeds the maximum value of the target temperature range, the control system 4 reduces the electric pulse voltage, the electric pulse frequency and the electric pulse pulse width to reduce the thermal effect;

[0063] When the temperature is less than the minimum value of the target temperature range, the control system 4 increases the electric pulse voltage, the electric pulse frequency and the electric pulse pulse width to increase the thermal effect.

[0064] The control system 4 increases or reduces the electric pulse voltage, the electric pulse frequency and the electric pulse pulse width to reduce the thermal effect according to the following formula:

[0065]

[0066] Wherein, Vp(t) is the current voltage of the electric pulse signal, Fp(t) is the current frequency of the electric pulse signal, Tp(t) is the current pulse width of the electric pulse signal, Vp(t+1) is the adjusted voltage of the electric pulse signal, Fp(t+1) is the adjusted frequency of the electric pulse signal, Tp(t+1) is the adjusted pulse width of the electric pulse signal, and α, β and ε are all adjustment coefficients and are less than 1, Tt is the maximum value of the target temperature range, and tc is the current temperature.

[0067] The control system 4 increases the electric pulse voltage, the electric pulse frequency and the electric pulse pulse width to increase the thermal effect according to the following formula:

[0068]

[0069] Wherein, Vp(t) is the current voltage of the electric pulse signal, Fp(t) is the current frequency of the electric pulse signal, Tp(t) is the current pulse width of the electric pulse signal, Vp(t+1) is the adjusted voltage of the electric pulse signal, Fp(t+1) is the adjusted frequency of the electric pulse signal, Tp(t+1) is the adjusted pulse width of the electric pulse signal, and α, β and ε are all adjustment coefficients and are less than 1, Tx is the minimum value of the target temperature range, and tc is the current temperature.

[0070] The present application has the following advantages:

[0071] When the pulsed electromagnetic force acts on the pipe, the residual stress inside the pipe is superimposed with the pulsed electromagnetic force, and when the total stress exceeds the yield strength of the pipe, the pipe locally occurs plastic deformation, thereby realizing the effective reduction of residual stress. In this process, the pulsed electromagnetic force acts on the inner wall of the pipe, so that the plastic deformation occurs in the local high stress area of the pipe, thereby achieving the purpose of residual stress relaxation and reduction; at the same time, the oscillating electromagnetic force generated by the gradually decaying fluctuation characteristics of the pulse current in the late discharge period provides a certain low-frequency oscillating force to the pipe. This additional oscillating force is superimposed with the original residual stress of the workpiece to form a driving force for promoting plastic deformation, which produces plastic deformation in the local high stress area to reduce the residual stress. In addition, the intelligent mobile device 3 can adjust its motion trajectory according to the axis trajectory of the bent pipe 6 to ensure that the pipe and the annular pulsed electromagnetic force generating device 2 are always coaxial, thereby ensuring that the pulsed electromagnetic force is uniformly applied to the surface of the pipe; the pipe placing device 5 can adjust the inner diameter size of the clamping mechanism 501 and the height of the lifting rod 502 according to the outer diameter size of the pipe to realize the coaxial effect of the pipe and the annular pulsed electromagnetic force generating device 2. The annular pulsed electromagnetic force generating device 2 does not contact the outer wall of the pipe, so it will not damage the surface quality of the pipe. Therefore, the present application has the advantages of good flexibility, high automation, no damage, green environmental protection, high efficiency and good residual stress treatment effect.

[0072] By adjusting the working parameters of the electric pulse generating device 1 in real time, the present application can also accurately control the thermal effect (eddy current generates Joule heat) in the processing process, ensure that the processing process is carried out within the target temperature range, and improve the processing effect and product quality. Specifically, when the temperature exceeds the maximum value of the target temperature range, the control system 4 prevents the pipe from being deformed or damaged due to overheating by reducing the electric pulse voltage, frequency and pulse width. On the contrary, when the temperature is lower than the minimum value of the target temperature range, the control system 4 ensures the full processing of the process by increasing these parameters. This real-time adjustment method not only improves the stability of the processing process, but also makes the present application suitable for processing pipes of different specifications and materials, showing strong adaptability and universality.

[0073] In addition, the present application also provides a simple and easy-to-use calculation method for the working parameters of the electric pulse signal, so that the control system 4 can quickly determine the appropriate working parameters according to the geometric size and stress distribution data of the pipe, further improving the processing efficiency and accuracy. This calculation method considers multiple factors such as material constants, pipe size and stress distribution, ensuring the rationality and effectiveness of the working parameters.

[0074] In summary, the present application improves the effect and quality of pipe processing by introducing the method of real-time adjustment of working parameters and the simple and easy-to-use parameter calculation method, and reduces the processing cost. BRIEF DESCRIPTION OF DRAWINGS

[0075] Fig. 1 The connection schematic diagram of the electric pulse generating device and the annular pulse electromagnetic force generating device provided by the embodiment of the application is shown in the figure.

[0076] Fig. 2 The overall schematic diagram of the pulse electromagnetic force eliminating pipe residual stress device provided by the embodiment of the application is shown in the figure.

[0077] Fig. 3 The cross-sectional structure schematic diagram of the annular pulse electromagnetic force generating device provided by the embodiment of the application is shown in the figure.

[0078] Fig. 4 The longitudinal section schematic diagram of the annular pulse electromagnetic force generating device provided by the embodiment of the application is shown in the figure.

[0079] Fig. 5 The skeleton axis graph for winding the electromagnetic coil provided by the embodiment of the application is shown in the figure.

[0080] In the figure, 1 is an electric pulse generating device, 101 is an electric pulse power supply, 102 is a step-up transformer, 103 is a rectifier bridge, 104 is a charging switch, 105 is a switch driver, 106 is a capacitor bank, 107 is a discharge switch, 108 is a discharge electrode, 2 is an annular pulse electromagnetic force generating device, 201 is an electromagnetic coil skeleton, 202 is an electromagnetic coil, 203 is an electromagnetic coil grid, 3 is an intelligent mobile device, 301 is a skeleton, 302 is a roller, 303 is an intelligent controller, 4 is a control system, 401 is a controller, 402 is a man-machine interface, 5 is a pipe placing device, 501 is a clamping mechanism, 502 is a lifting rod, 503 is a base, and 6 is a curved pipe. DETAILED DESCRIPTION

[0081] The application will be described in detail below with reference to the embodiments, but the application is not limited to these embodiments.

[0082] Embodiment 1

[0083] Referring to Figs. 1 to 5 The embodiment discloses a pulse electromagnetic force eliminating high-strength titanium pipe residual stress device, which comprises an electric pulse generating device 1, an annular pulse electromagnetic force generating device 2, an intelligent mobile device 3, a control system 4, and a pipe placing device 5.

[0084] The electric pulse generating device 1 is used to provide an electric pulse signal for the annular pulse electromagnetic force generating device 2.

[0085] The annular pulse electromagnetic force generating device 2 is used to generate a pulse electromagnetic force and act on a curved pipe 6.

[0086] The intelligent mobile device 3 is used to adjust the motion trajectory of the pulse electromagnetic force acting device.

[0087] The control system 4 is used for coordinating the working time sequence and parameters of the electric pulse generating device 1 and displaying the temperature change information in real time.

[0088] The pipe placing device 5 is used for fixing and supporting the bending pipe 6 to be processed.

[0089] The bending pipe 6 is a titanium alloy pipe.

[0090] The electric pulse generating device 1 comprises an electric pulse power supply 101, a step-up transformer 102, a rectifier bridge 103, a charging switch 104, a switch driver 105, a capacitor bank 106, a discharge switch 107 and a discharge electrode 108.

[0091] The electric pulse power supply 101 connects the capacitor bank 106 through the step-up transformer 102 to provide the capacitor bank 106 with a required charging voltage.

[0092] The rectifier bridge 103 is arranged between the step-up transformer 102 and the charging switch 104 and is used for converting the alternating voltage output by the step-up transformer 102 into direct current voltage to provide the capacitor bank 106 with stable charging voltage.

[0093] The charging switch 104 is arranged between the capacitor bank 106 and the electric pulse power supply 101 and is used for controlling the charging process of the capacitor bank 106.

[0094] The discharge switch 107 is arranged between the capacitor bank 106 and the discharge electrode 108 and is used for controlling the discharging process of the capacitor bank 106.

[0095] The capacitor bank 106 is connected with the charging switch 104, the discharge switch 107 and the discharge electrode 108 to form a discharging loop.

[0096] The switch driver 105 is connected with the control system 4 and is used for controlling the on-off of the charging switch 104 and the discharge switch 107.

[0097] The discharge electrode 108 is connected with the annular pulse electromagnetic force generating device 2.

[0098] The energy stored in the capacitor bank 106 is applied to the discharge electrode 108 in the form of electric pulse to generate electromagnetic force.

[0099] The annular pulse electromagnetic force generating device 2 comprises a coil framework 201, an electromagnetic coil 202 and a coil grid 203, which are all made of insulating epoxy resin material.

[0100] The coil framework 201 is used for tightly winding the electromagnetic coil 202 on the coil grid 203, and the electromagnetic coil 202 wound on the coil grid 203 is reinforced by using charon fiber.

[0101] The electromagnetic coil 202 adopts copper wire with good electrical conductivity to receive the current generated by the electric pulse generating device 1.

[0102] The intelligent moving device 3 comprises a framework 301, a roller 302 and an intelligent controller 303.

[0103] The framework 301 is used to support the annular pulse electromagnetic force generating device 2.

[0104] The roller 302 is used to drive the movement of the framework 301 and the annular pulse electromagnetic force generating device 2.

[0105] The intelligent controller 303 is used to adjust the motion trajectory of the intelligent moving device 3 to ensure that the motion trajectory is consistent with the axis trajectory of the curved pipe 6.

[0106] The control system 4 is composed of a controller 401 and a man-machine interaction interface 402.

[0107] The controller 401 sets the working parameters of the electric pulse generating device 1 according to the size of the curved pipe 6 and the distribution of the residual stress.

[0108] The working parameters include the voltage, frequency and pulse width of the electric pulse signal.

[0109] The control system 4 is also connected with the temperature monitoring device in the pipe placing device 5, which is used to monitor the temperature change information of the curved pipe 6 in the processing process in real time, and the control system 4 adjusts the working parameters of the electric pulse generating device 1 in real time according to the received temperature change information.

[0110] The man-machine interaction interface 402 is used to receive the instructions and parameters input by the user, and to display the process information of the pulse electromagnetic force eliminating the residual stress of the curved pipe 6 and the temperature change information in real time.

[0111] The pipe placing device 5 comprises a clamping mechanism 501, a lifting rod 502 and a base 503.

[0112] The clamping mechanism 501 is made of insulating epoxy resin, and two clamping mechanisms 501 are arranged on the lifting rod 502 to fix and clamp the curved pipe 6, and the two clamping mechanisms 501 clamp the two ends of the curved pipe 6.

[0113] The lifting rod 502 is used to adjust the height of the pipe to ensure that its axis is coaxial with the axis of the annular pulse electromagnetic force generating device 2.

[0114] The base 503 is used to stably support the entire pipe placing device 5.

[0115] The central axis of the curved pipe 6 is coaxial with the annular pulse electromagnetic force generating device 2, the annular pulse electromagnetic force generating device 2 is installed on the skeleton 301 of the intelligent mobile device 3 with the roller 302, and the curved pipe 6 is horizontally fixed on the pipe placing device 5.

[0116] The controller 401 comprises a central processor and an electric pulse control module; the central processor is connected with the electric pulse control module, and the central processor is used for controlling the working state of the electric pulse generating device 1 according to the pre-set working time sequence and parameters.

[0117] The electric pulse generating device 1 further comprises a voltage regulator and a waveform adjuster;

[0118] The voltage regulator is connected between the electric pulse power supply 101 and the step-up transformer 102, and is used for adjusting the charging voltage output by the step-up transformer 102 according to the instruction of the central processor; the waveform adjuster is connected between the capacitor group 106 and the switch, and is used for adjusting the waveform characteristics when the capacitor group 106 discharges according to the instruction of the central processor.

[0119] It can be understood that the embodiment aims to disclose a device and method for removing residual stress of a curved pipe 6 by pulse electromagnetic force, which is particularly suitable for titanium alloy pipes. The device utilizes the principle of electromagnetic induction to convert electric pulses into electromagnetic force technology, aiming to effectively remove the residual stress generated in the processing of the curved pipe 6 and improve the performance and service life of the pipe.

[0120] In the embodiment, the design and application of the pulse electromagnetic force generating device plays a key role in the device for removing residual stress of the curved pipe 6 by pulse electromagnetic force. The electromagnetic coil grid 203 is as few as possible and uniformly and sparsely distributed without affecting the close winding of the electromagnetic coil 202, so as to ensure that the generated electromagnetic force is not affected and the treatment effect is reduced.

[0121] The annular pulse electromagnetic force generating device 2 is made of epoxy resin, is sleeved on the outer wall of the curved pipe 6, and is coaxially installed, can generate uniform electromagnetic force in the circumferential direction of the curved pipe 6, and avoids deformation of the curved pipe 6 caused by uneven electromagnetic force. A certain gap (5mm) is left between the annular pulse electromagnetic force generating device 2 and the outer wall of the curved pipe 6, so as to avoid contact between the two and cause electromagnetic induction failure. The design of the annular pulse electromagnetic force generating device 2 enables the electric pulse signal to be converted into pulse electromagnetic force which is more uniformly distributed on the pipe surface, so as to ensure uniform removal of residual stress.

[0122] The electric pulse generating device 1 further comprises a rectifier bridge 103; the rectifier bridge 103 is arranged between the step-up transformer 102 and a charging switch 104; the rectifier bridge 103 is used to convert the alternating voltage output by the step-up transformer 102 into direct current voltage, so as to provide a stable charging voltage for the capacitor bank 106.

[0123] The switch comprises the charging switch 104 and a discharging switch 107; the charging switch 104 is arranged between the capacitor bank 106 and the electric pulse power supply 101, and is used to control the charging process of the capacitor bank 106; the discharging switch 107 is arranged between the capacitor bank 106 and the discharging electrode 108, and is used to control the discharging process of the capacitor bank 106.

[0124] The electric pulse generating device 1 further comprises a switch driver 105; the switch driver 105 is arranged between the control system 4 and the charging switch 104 and the discharging switch 107, and is used to receive the control signal of the control system 4 and drive the on-off of the switch.

[0125] The pipe placing device 5 comprises a clamping mechanism 501, a lifting rod 502 and a base 503; the base 503 is used to stably support the entire pipe placing device 5; the clamping mechanism 501 is used to fix and clamp the bent pipe 6 to be processed, and the inner diameter of the clamping mechanism can be adjusted or replaced, so as to adapt to pipes with different outer diameters;

[0126] The clamping mechanism 501 is made of insulating epoxy resin, so as to ensure that the pipe receives a large enough electromagnetic force;

[0127] The lifting rod 502 can adjust the placing height of the pipe, so as to make the pipe to be processed coaxial with the annular pulse electromagnetic force generating device 2, and keep the pipe receiving uniform pulse electromagnetic force.

[0128] The framework 301 and the roller 302 are used to move the annular pulse electromagnetic force generating device 2 placed thereon; the most critical intelligent controller 303 can adjust the moving track of the intelligent moving device 3 according to the track of the pipe axis, and then adjust the moving track of the annular pulse electromagnetic force generating device 2, so as to make the moving track of the intelligent moving device 3 coincide with the track of the axis of the bent pipe 6, and ensure that the gap between the annular pulse electromagnetic force generating device 2 and the outer wall of the bent pipe 6 is always kept unchanged, and the pipe receives uniform pulse electromagnetic force.

[0129] The electric pulse generating device 1 further comprises a voltage regulator and a waveform adjuster;

[0130] The voltage regulator is connected in the electric pulse power supply 101, and is used to adjust the charging voltage output by the electric pulse power supply 101 according to the instruction of the central processing unit; the waveform adjuster is connected between the capacitor bank 106 and the switch, and is used to adjust the waveform characteristics when the capacitor bank 106 discharges according to the instruction of the central processing unit.

[0131] In the configuration of the electric pulse generating device 1, the voltage regulator and the waveform adjuster are indispensable key components. The voltage regulator is connected in the electric pulse power supply 101, which can accurately adjust the charging voltage output by the electric pulse power supply 101 according to the instructions of the central processor.

[0132] The waveform adjuster is connected between the capacitor bank 106 and the switch, and its main function is to adjust the waveform characteristics of the capacitor bank 106 during discharge according to the instructions of the central processor. The introduction of the waveform adjuster enables the electric pulse generating device 1 to generate electric pulses with specific waveform characteristics, thereby meeting the needs of different application scenarios. This flexibility and adaptability make the electric pulse generating device 1 have a wider range of applications in actual use.

[0133] The temperature monitoring device not only has real-time monitoring function, but also has powerful data processing and transmission capability. It can transmit the monitored temperature change information to the human-computer interaction interface 402 and the controller 401 in real time. The human-computer interaction interface 402 can display these temperature change information in real time, so that the operating personnel can intuitively understand the temperature change during the pipe processing.

[0134] And the controller 401 adjusts the working parameters of the electric pulse generating device 1 in real time according to the received temperature change information. This intelligent adjustment method ensures that the temperature during the pipe processing always remains within the appropriate range, thereby improving the processing quality and efficiency of the pipe.

[0135] The control system 4 sets the working parameters of the electric pulse generating device 1 according to the size of the bent pipe 6 and the distribution of residual stress; the working parameters include the voltage, frequency and pulse width of the electric pulse signal;

[0136] Start the electric pulse generating device 1 to start the charging process of the capacitor bank 106 until it reaches the preset voltage level. After the capacitor bank 106 is fully charged, the control system 4 will accurately control the action of the switch to ensure that the capacitor bank 106 can smoothly release the electric pulse signal to the bent pipe 6 through the discharge electrode 108. This electric pulse signal will be connected to the annular pulse electromagnetic force generating device 2 to achieve the purpose of reducing residual stress by inducing micro or local plastic deformation.

[0137] The residual stress is superimposed with the pulse electromagnetic force, and when the total stress on the pipe exceeds its yield strength, plastic deformation will occur in the local high stress area of the pipe. This process helps to achieve the reduction of residual stress, thereby improving the overall performance and shape stability of the pipe.

[0138] The control system 4 adjusts the working parameters of the electric pulse according to the real-time feedback stress data to achieve accurate control of the residual stress;

[0139] When the processing reaches the preset target effect, the control system 401 automatically turns off the electric pulse generating device 1 and the pulsed electromagnetic force device and the intelligent moving device 3, completing the entire processing process.

[0140] Firstly, the control system 4 accurately sets the working parameters of the electric pulse generating device 1 according to the size of the curved pipe 6 and the distribution of residual stress. These parameters include the voltage, frequency, and pulse width of the electric pulse signal. By accurately controlling these parameters, it can ensure that the influence of the processing process on the pipe reaches the expected effect.

[0141] Next, the control system 4 starts the electric pulse generating device 1 and charges the capacitor bank 106 to the preset voltage. When the capacitor bank 106 is fully charged, the control system 4 accurately controls the switch action to make the capacitor bank 106 release the electric pulse signal to the annular pulsed electromagnetic force generating device 2 through the discharge electrode 108. These electric pulse signals pass through the annular pulsed electromagnetic force generating device 2 to generate pulsed electromagnetic force on the pipe surface, improve the stress distribution inside the pipe, and reduce the level of residual stress.

[0142] During the entire processing process, the control system 4 continuously adjusts the working parameters of the electric pulse according to the real-time feedback of the stress data. This real-time feedback and adjustment mechanism can ensure that the processing process always remains in the best state, achieving precise control of residual stress.

[0143] When the processing reaches the preset target effect, the control system 4 automatically turns off the electric pulse generating device 1 and the annular pulsed electromagnetic force generating device 2 and the intelligent moving device 3, completing the entire processing process. In this way, it can ensure that the efficiency and effect of the processing reach the best state, while avoiding unnecessary damage to the pipe.

[0144] In some embodiments of the present application, when the control system 4 sets the working parameters of the electric pulse generating device 1 according to the size of the curved pipe 6 and the distribution of residual stress, it includes:

[0145] Use the stress testing equipment to preliminarily detect the residual stress of the curved pipe 6 and obtain its stress distribution data; input the detected stress distribution data into the control system 4 to analyze the stress conditions of different parts of the curved pipe 6 and determine the stress concentration area and stress gradient change;

[0146] According to the geometric size and stress distribution data of the curved pipe 6, calculate the working parameters of the electric pulse signal;

[0147] The geometric size of the curved pipe 6 includes diameter, wall thickness, and bending radius; the working parameters include the voltage, frequency, and pulse width of the electric pulse signal.

[0148] First, the control system 4 will use advanced stress testing equipment to conduct preliminary detection on the bent pipe 6. This step aims to obtain the residual stress distribution data generated during the bending process. These testing equipment usually has high precision and high sensitivity, which can capture the small stress changes of the pipe at different positions. Through testing, the control system 4 can obtain a series of data about the stress distribution of the pipe, which provides a basis for subsequent parameter setting.

[0149] Next, the control system 4 will input the detected stress distribution data into the internal analysis module. This module will conduct in-depth analysis on the data to determine the stress conditions of different parts of the pipe. Through comparison and analysis, the control system 4 can identify the stress concentration areas and areas with large stress gradient changes. These information is crucial for the subsequent parameter setting of the electric pulse signal.

[0150] After obtaining the geometric dimensions and stress distribution data of the pipe, the control system 4 will perform a series of complex calculations. These calculations are based on the principles of physics and engineering, aiming to determine the optimal working parameters of the electric pulse signal. These parameters include the voltage, frequency, pulse width, etc. of the electric pulse signal. By adjusting these parameters, the control system 4 can effectively eliminate or adjust the residual stress of the pipe.

[0151] In some embodiments of the present application, the calculation formula of the working parameters of the electric pulse signal includes:

[0152] The calculation formula of the voltage of the electric pulse signal is:

[0153]

[0154] where Vp is the voltage of the electric pulse signal, k1 is the material constant, σ max is the maximum residual stress detected, t is the wall thickness of the pipe;

[0155] The calculation formula of the frequency of the electric pulse signal is:

[0156]

[0157] where Fp is the frequency of the electric pulse signal, k2 is the adjustment constant, D is the diameter of the pipe;

[0158] The calculation formula of the pulse width of the electric pulse signal is:

[0159]

[0160] where Tp is the pulse width of the electric pulse signal, k3 is the adjustment constant.

[0161] It can be understood that the present embodiment details the calculation formula of the working parameters of the electric pulse signal. These formulas aim to accurately describe and adjust the signal characteristics when processing titanium alloy pipes, in order to achieve more efficient and accurate processing results.

[0162] First, regarding the voltage calculation formula of the electric pulse signal, we introduce Vp to represent the voltage of the electric pulse signal. This voltage value is determined by multiple factors. Among them, k1 is a material constant, which reflects the inherent properties of titanium alloy materials and plays a crucial role in voltage calculation. σ max represents the maximum residual stress detected, which is a stress concentration phenomenon generated during the processing or use of the pipe, and also has a significant impact on voltage calculation. t represents the wall thickness of the pipe, which directly affects the distribution and transmission of voltage. Therefore, by integrating these parameters, we can derive the voltage calculation formula of the electric pulse signal, and then adjust the voltage value to adapt to different processing needs.

[0163] Next, we consider the frequency calculation formula of the electric pulse signal. In this formula, Fp represents the frequency of the electric pulse signal, which determines the number of times the signal is transmitted per unit time. k2 is an adjustment constant used to adjust the frequency value according to actual needs. D is the diameter of the pipe, which also has a significant impact on the propagation and distribution of frequency. By reasonably adjusting these parameters, we can obtain the electric pulse signal frequency suitable for specific processing tasks.

[0164] In addition, the pulse width of the electric pulse signal is also an important working parameter. In the calculation formula, Tp represents the pulse width, which determines the duration of the signal during transmission. k3 is an adjustment constant used to adjust the pulse width according to processing needs. By optimizing the pulse width, we can improve the processing efficiency of the signal while reducing unnecessary energy loss.

[0165] The control system 4 adjusts the working parameters of the electric pulse generating device 1 in real time according to the received temperature change information; the real-time adjustment method includes:

[0166] When the temperature exceeds the maximum value of the target temperature range, the control system 401 reduces the electric pulse voltage, electric pulse frequency, and electric pulse pulse width to reduce the thermal effect;

[0167] When the temperature is less than the minimum value of the target temperature range, the control system 401 increases the electric pulse voltage, electric pulse frequency, and electric pulse pulse width to increase the thermal effect.

[0168] The control system 4 not only has basic instruction execution and data processing capabilities, but also is equipped with a sophisticated temperature monitoring and regulation mechanism. The core of this mechanism is that the control system 4 can receive real-time temperature change information from various sensors and make precise adjustments to the working parameters of the electric pulse generating device 1 accordingly.

[0169] Specifically, when the control system 4 detects that the current temperature exceeds the maximum value of the preset target temperature range, it will immediately initiate a series of cooling measures. These measures include, but are not limited to, reducing the voltage, frequency, and pulse width of the electric pulse. By reducing these parameters, the heat generated during the work can be significantly reduced, thereby avoiding the risks that may be caused by overheating of the equipment and pipe materials.

[0170] Conversely, when the temperature is lower than the minimum value of the target temperature range, the control system 4 will take corresponding warming measures. This usually means increasing the voltage, frequency, and pulse width of the electric pulse. Such adjustments can increase the heat effect, thereby improving the efficiency of eliminating residual stress.

[0171] In some embodiments of the present application, the real-time adjustment method further includes:

[0172] The control system 4 reduces the electric pulse voltage, electric pulse frequency, and electric pulse pulse width to reduce the heat effect according to the following formula:

[0173]

[0174] Wherein, Vp(t) is the current voltage of the electric pulse signal, Fp(t) is the current frequency of the electric pulse signal, Tp(t) is the current pulse width of the electric pulse signal, Vp(t+1) is the adjusted voltage of the electric pulse signal, Fp(t+1) is the adjusted frequency of the electric pulse signal, Tp(t+1) is the adjusted pulse width of the electric pulse signal, α, β, ε are adjustment coefficients, and α, β, ε are all less than 1, Tt is the maximum value of the target temperature range, and tc is the current temperature.

[0175] The control system 4 increases the electric pulse voltage, electric pulse frequency, and electric pulse pulse width to increase the heat effect according to the following formula:

[0176]

[0177] Wherein, Vp(t) is the current voltage of the electric pulse signal, Fp(t) is the current frequency of the electric pulse signal, Tp(t) is the current pulse width of the electric pulse signal, Vp(t+1) is the adjusted voltage of the electric pulse signal, Fp(t+1) is the adjusted frequency of the electric pulse signal, Tp(t+1) is the adjusted pulse width of the electric pulse signal, α, β, ε are adjustment coefficients, and α, β, ε are all less than 1, Tx is the minimum value of the target temperature range, and tc is the current temperature.

[0178] We need to understand the important role of these parameters in the process. The electric pulse voltage, frequency and pulse width determine the strength and duration of the electric pulse signal, and in turn determine the strength of the pulse electromagnetic force. Precise control of these parameters is crucial to achieve the desired process effect.

[0179] In order to reduce the thermal effect, the control system 401 will calculate and adjust according to a series of formulas. These formulas take into account the current electric pulse parameters and the current temperature information. Among them, Vp(t) represents the current voltage of the electric pulse signal, Fp(t) represents the current frequency of the electric pulse signal, and Tp(t) represents the current pulse width of the electric pulse signal. These parameters are obtained in real time, reflecting the current process state.

[0180] Then, the control system 4 will calculate the adjusted parameter values according to the maximum value Tt and the minimum value Tx of the target temperature range, and the current temperature tc. These adjusted parameter values include Vp(t+1), Fp(t+1), Tp(t+1), which represent the adjusted voltage, frequency and pulse width of the electric pulse signal. The selection of these adjustment coefficients is very critical, as they need to ensure that the adjusted parameter values can achieve the goal of reducing the thermal effect, while not having a negative impact on the process.

[0181] The selection of adjustment coefficients is usually based on a large amount of experimental data and experience accumulation. In experiments, researchers will try different combinations of adjustment coefficients, observe their effects on thermal effects and process effects, and determine the optimal adjustment coefficient values. These adjustment coefficients are usually less than 1 to ensure that the adjusted parameter values do not exceed the preset safety range.

[0182] In addition to the selection of adjustment coefficients, real-time adjustment methods also need to consider other factors. For example, different materials may have different response characteristics to electric pulses, so the parameters need to be adjusted according to the specific material. In addition, other variables such as environmental temperature, humidity, etc. in the process may also affect the thermal effect, so these variables need to be monitored and adjusted in real time.

[0183] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make several modifications or substitutions within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A device for eliminating residual stress in high-strength titanium tubes using pulsed electromagnetic force, characterized in that, It consists of an electric pulse generator 1, a ring pulse electromagnetic force generator 2, an intelligent moving device 3, a control system 4, and a pipe placement device 5; The electrical pulse generating device 1 is used to provide an electrical pulse signal to the ring pulse electromagnetic force generating device 2. The annular pulse electromagnetic force generating device 2 is used to generate pulse electromagnetic force and apply it to the bent pipe 6; The intelligent mobile device 3 is used to adjust the motion trajectory of the pulse electromagnetic force action device; The control system 4 is used to coordinate the working timing and parameters of the electric pulse generator 1 and to display temperature change information in real time. The pipe placement device 5 is used to fix and support the bent pipe 6 to be processed; The bent pipe 6 is a titanium alloy pipe.

2. The device for eliminating residual stress in high-strength titanium tubes using pulsed electromagnetic force according to claim 1, characterized in that, The electrical pulse generating device 1 includes an electrical pulse power supply 101, a step-up transformer 102, a rectifier bridge 103, a charging switch 104, a switch driver 105, a capacitor bank 106, a discharge switch 107, and a discharge electrode 108. The electrical pulse power supply 101 is connected to the capacitor bank 106 through the step-up transformer 102, providing the required charging voltage to the capacitor bank 106; The rectifier bridge 103 is placed between the step-up transformer 102 and the charging switch 104 to convert the AC voltage output by the step-up transformer 102 into DC voltage, so as to provide a stable charging voltage for the capacitor bank 106. The charging switch 104 is disposed between the capacitor bank 106 and the electrical pulse power supply 101 and is used to control the charging process of the capacitor bank 106. The discharge switch 107 is disposed between the capacitor bank 106 and the discharge electrode 108 and is used to control the discharge process of the capacitor bank 106. The capacitor bank 106 is connected to the charging switch 104, the discharging switch 107, and the discharging electrode 108 to form a discharge circuit. The switch driver 105 is connected to the control system 4 and controls the on / off state of the charging switch 104 and the discharging switch 107. The discharge electrode 108 is connected to the annular pulse electromagnetic force generating device 2; The energy stored in the capacitor bank 106 is applied to the discharge electrode 108 in the form of electrical pulses to generate electromagnetic force.

3. The device for eliminating residual stress in high-strength titanium tubes using pulsed electromagnetic force according to claim 2, characterized in that, The annular pulse electromagnetic force generating device 2 includes a coil frame 201, an electromagnetic coil 202, and a coil grid 203, all of which are made of insulating epoxy resin material. The coil frame 201 is used to tightly wind the electromagnetic coil 202 onto the coil grid 203, and the electromagnetic coil 202 wound onto the coil grid 203 is reinforced with ziron fiber. The electromagnetic coil 202 is made of copper wire with good conductivity and is used to receive the current generated by the electrical pulse generator 1.

4. The device for eliminating residual stress in high-strength titanium tubes using pulsed electromagnetic force according to claim 3, characterized in that, The intelligent mobile device 3 includes a frame 301, wheels 302, and an intelligent controller 303. The frame 301 is used to support the annular pulse electromagnetic force generating device 2; The roller 302 is used to drive the frame 301 and the annular pulse electromagnetic force generating device 2 to move. The intelligent controller 303 is used to adjust the movement trajectory of the intelligent mobile device 3 to ensure that the movement trajectory is consistent with the axis trajectory of the curved pipe 6.

5. The device for eliminating residual stress in high-strength titanium tubes using pulsed electromagnetic force according to claim 4, characterized in that, The control system 4 consists of a controller 401 and a human-machine interface 402; The controller 401 sets the operating parameters of the electric pulse generator 1 according to the dimensions of the bent pipe 6 and the distribution of residual stress. The operating parameters include the voltage, frequency, and pulse width of the electrical pulse signal; The control system 4 is also connected to the temperature monitoring device in the pipe placement device 5, which is used to monitor the temperature change information of the bent pipe 6 in real time during the processing. The control system 4 adjusts the working parameters of the electric pulse generator 1 in real time according to the received temperature change information. The human-machine interface 402 is used to receive user input instructions and parameters, and to display in real time the process information and temperature change information of pulse electromagnetic force eliminating residual stress in the bent pipe 6.

6. The device for eliminating residual stress in high-strength titanium tubes using pulsed electromagnetic force according to claim 5, characterized in that, The pipe placement device 5 includes a clamping mechanism 501, a lifting rod 502, and a base 503; Two clamping mechanisms 501 are provided and are made of insulating epoxy resin. The two clamping mechanisms 501 are provided on the lifting rod 502 and are used to fix and clamp the bent pipe 6. The two clamping mechanisms 501 are clamped at both ends of the bent pipe 6. The lifting rod 502 is used to adjust the height of the pipe to ensure that its axis is coaxial with the axis of the annular pulse electromagnetic force generating device 2. The base 503 is used to stably support the entire pipe placement device 5.

7. The device for eliminating residual stress in high-strength titanium tubes using pulsed electromagnetic force according to claim 6, characterized in that, The central axis of the bent pipe 6 is coaxial with the annular pulse electromagnetic force generating device 2. The annular pulse electromagnetic force generating device 2 is mounted on the frame 301 of the intelligent mobile device 3 with rollers 302. The bent pipe 6 is horizontally fixed on the pipe placement device 5.

8. A method for eliminating residual stress in high-strength titanium tubes using pulsed electromagnetic force, characterized in that, The apparatus described in any one of claims 1 to 7 may be used; Includes the following steps: The residual stress of the bent pipe 6 is initially detected using stress testing equipment to obtain its stress distribution data; the detected stress distribution data is input into the control system 4 to analyze the stress conditions of different parts of the bent pipe 6 and determine the stress concentration area and stress gradient change. Based on the geometric dimensions and stress distribution data of the bent pipe 6, the operating parameters of the electrical pulse signal were calculated. Start the electric pulse generator 1 to charge the capacitor bank 106 to the preset voltage; when the capacitor bank 106 is fully charged, the controller 401 controls the charging switch 104 and the discharging switch 107 to operate, so that the capacitor bank 106 discharges to the electromagnetic coil 202 through the discharging electrode 108. When current passes through the pulse magnet, a strong pulse magnetic field is generated. This magnetic field induces eddy currents in the bent pipe 6, thereby generating a pulse electromagnetic force that acts on the surface of the bent pipe 6, improving the stress distribution inside the bent pipe 6 and reducing the residual stress level. When the processing achieves the preset target effect, the control system 4 automatically shuts down the electrical pulse generator 1, completing the entire processing process.

9. The method according to claim 8, characterized in that, The control system 4 adjusts the operating parameters of the electric pulse generator 1 based on the real-time feedback stress data to achieve precise control of residual stress.

10. The method according to claim 8, characterized in that, The geometry of the bent pipe 6 includes diameter, wall thickness, and bending radius.

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