Electric auxiliary bending forming device and method for metal pipe

Abstract

The invention relates to a metal pipe electric auxiliary bending forming device and method, and relates to the field of metal pipe bending forming machining. The rear conductive part comprises a conductive sleeve provided with a second slot; the positioning plate is fixed on the inner side of the conductive sleeve; the movable part comprises a sliding column which penetrates through the positioning plate and is in sliding connection with the positioning plate, and the sliding direction is the axial direction of the conductive sleeve; the limiting piece is located in the conductive sleeve and connected with one end of the sliding column; the filling particles are filled in the metal tube; one end of the steel wire rope is connected with the movable part and the other end is connected with the front conductive part; the pressure sensor abuts against the side, away from the sliding column, of the limiting piece. The limiting body is connected with the conductive sleeve and abuts against the side, away from the limiting piece, of the pressure sensor. The pressure in the pipe is kept constant during bending forming of the metal pipe, the problems of uneven distribution of particles in the pipe, local particle supporting failure of the pipe fitting, unstable bending deformation of the pipe fitting and the like can be avoided, and the forming precision of the bent pipe is improved.

Description

Technical Field

[0001] The present invention relates to the field of metal pipe bending forming processing, and particularly to an electro-assisted bending forming device and method for metal pipes. Background Art

[0002] In the fields of aerospace, automobile manufacturing, and high-end equipment, thin-walled metal pipes have attracted much attention due to their characteristics such as lightweight, high strength, and high temperature and pressure resistance.

[0003] Chinese Patent CN117123660A discloses a multi-field coupling type pipe bending forming device, including: a frame, a propulsion unit, a wheel die unit, a wrinkling prevention and clamping unit, a rotating die unit, current application points at both ends of the pipe fitting, an insulating component for isolating the current between the pipe fitting and the die, a state sensing unit for sensing the state parameters of the pipe bending forming process, and a support part fixedly arranged above the working panel and used for supporting the pipe fitting; based on the electro-assisted pipe bending processing technology, by adopting the sensing unit, multi-field data during the pipe fitting processing is detected, and the optimal applied current is judged based on the data information, which can effectively improve the pipe bending forming quality.

[0004] In the above device, the state sensing unit includes a pressure sensor for sensing the stress field of the pipe fitting, and the pressure sensor is arranged on the outer side of the pipe fitting to detect the acting force applied by the rotating die unit on the outer wall of the pipe fitting. When the above device performs pipe bending forming, the pressure inside the pipe is not monitored. During the pipe bending process, the pressure inside the pipe is not constant, which may cause problems such as uneven distribution of particles inside the pipe, local particle support failure of the pipe fitting, and unstable bending deformation of the pipe fitting.

[0005] For the above reasons, it is necessary to monitor and adjust the pressure inside the pipe during the pipe bending forming process to ensure that the pressure inside the pipe remains constant and improve the precision of the pipe bending forming. Summary of the Invention

[0006] Aiming at the problems in the existing pipe bending forming solutions, such as the lack of structures and means to maintain a constant pressure inside the pipe, which may lead to uneven distribution of particles inside the pipe, local particle support failure of the pipe fitting, and unstable bending deformation of the pipe fitting, the present invention provides an electro-assisted bending forming device and method for metal pipes. A pressure sensor is arranged inside the metal pipe, and the pressure inside the metal pipe is adjusted based on the detection result of the pressure sensor, so that the pressure inside the metal pipe remains constant during the bending forming of the metal pipe, to solve the problems such as uneven distribution of particles inside the pipe, local particle support failure of the pipe fitting, and unstable bending deformation of the pipe fitting, and improve the precision of the pipe bending forming.

[0007] The present invention provides an electro-assisted bending forming device for metal pipes, including:

[0008] A front conductive part, which is provided with a first slot for inserting a metal pipe.

[0009] The rear conductive member includes: a conductive sleeve provided with a second slot for inserting a metal tube; and a positioning plate fixed inside the conductive sleeve.

[0010] The movable member includes: a sliding column passing through the positioning plate and slidably connected to the positioning plate, with the sliding direction being the axial direction of the conductive sleeve; and a limiting member located inside the conductive sleeve and connected to one end of the sliding column.

[0011] Filling particles are filled inside the metal tube.

[0012] One end of a steel wire rope is connected to the movable member, and the other end passes through the front conductive member and is connected to the front conductive member.

[0013] A pressure sensor abuts against the side of the limiting member away from the sliding column.

[0014] A limiting body is connected to the conductive sleeve and abuts against the side of the pressure sensor away from the limiting member.

[0015] The method for adjusting the pressure inside the metal tube is: changing the connection position of the limiting body in the axial direction of the conductive sleeve, or changing the connection position of the front conductive member on the steel wire rope.

[0016] In some embodiments, the movable member further includes: a limiting plate located outside the conductive sleeve, connected to the other end of the sliding column, and slidably engaged with the inner wall of the metal tube.

[0017] In some embodiments, the metal tube electro-assisted bending forming device further includes: a temperature measuring device for detecting the temperature of the metal tube.

[0018] In some embodiments, the limiting body is threadedly connected to the inner side of the conductive sleeve.

[0019] In some embodiments, the metal tube electro-assisted bending forming device further includes:

[0020] A spherical bearing.

[0021] A bending ball die is connected to the inner ring of the spherical bearing and has a tube forming channel inside.

[0022] A guiding mechanism is connected to the bending ball die and has a tube guiding channel communicating with the tube forming channel.

[0023] In some embodiments, the front conductive member is located on the side of the bending ball die away from the guiding mechanism, and the rear conductive member is located on the side of the guiding mechanism away from the bending ball die.

[0024] In some embodiments, the metal tube electro-assisted bending forming device further includes:

[0025] A linear slide rail with a fixed position, parallel to the axis of the guiding mechanism.

[0026] The first sliding table is connected to the conductive sleeve and is slidably connected to the linear slide rail.

[0027] The first driving device is used to drive the first sliding table to move along the linear slide rail.

[0028] The second driving device moves along with the first sliding table and is used to drive the limiting body to rotate so as to change the depth of the limiting body screwed into the conductive sleeve.

[0029] In some embodiments, the first driving device includes:

[0030] The mounting seat has a fixed position.

[0031] The lead screw is parallel to the linear slide rail, is threadedly connected to the first sliding table, and is rotatably connected to the mounting seat at both ends.

[0032] The first motor drives the lead screw to rotate.

[0033] In some embodiments, the second driving device includes:

[0034] The second sliding table is slidably connected to the linear slide rail and is threadedly connected to the lead screw;

[0035] The second motor is mounted on the second sliding table and drives the limiting body to rotate.

[0036] The present invention also provides a method for electrically assisted bending forming of a metal tube. Using the above-mentioned device for electrically assisted bending forming of a metal tube, both ends of the metal tube are inserted into the first slot and the second slot, the metal tube is filled with particles, and the steel wire rope is tightened. The front conductive member and the rear conductive member are connected to a power source. Subsequently, a force is applied to the metal tube to bend it, and during the bending forming of the metal tube, the pressure inside the metal tube is dynamically adjusted so that the detection result of the pressure sensor is maintained within a preset pressure range.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] 1. During the bending forming of the metal tube, the pressure sensor is clamped between the limiting body and the movable member, and the filling particles inside the pipe transmit pressure to the pressure sensor through the movable member, so that the detection result of the pressure sensor can reflect the pressure inside the metal tube. The user adjusts the pressure inside the metal tube based on the detection result of the pressure sensor, so that the pressure inside the tube remains constant during the bending forming of the metal tube, which can avoid problems such as uneven distribution of particles inside the tube, local particle support failure of the pipe fitting, and unstable bending deformation of the pipe fitting, and improve the bending forming accuracy of the pipe.

[0039] 2. During the bending forming of the metal tube, the real-time temperature of the metal tube is detected, and the current input into the metal tube is dynamically adjusted so that the temperature of the metal tube is maintained within a preset temperature range, thereby further improving the bending forming accuracy of the pipe.

[0040] 3. During the bending and forming of the metal tube, the pressure regulation inside the metal tube and the temperature adjustment of the metal tube can both be automatically adjusted, which helps to improve the response speed and response accuracy of the internal pressure and the tube body temperature to the pressure sensor and the temperature measuring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings described herein are used to provide a further understanding of the present invention and form a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0042] Figure 1 A cross-sectional view showing the installation position of the pressure sensor in the present invention;

[0043] Figure 2 A cross-sectional view showing the structure of the front conductive member in the present invention;

[0044] Figure 3 A perspective view of the electro-assisted bending and forming device for the metal tube in the present invention;

[0045] Figure 4 A top view of the electro-assisted bending and forming device for the metal tube in the present invention;

[0046] Figure 5 is Figure 3 an enlarged schematic view of area A in

[0047] Figure 6 A partial schematic view showing the transmission member in the present invention.

[0048] In the figures:

[0049] 11. Front conductive member; 111. First slot; 12. Rear conductive member; 121. Conductive sleeve; 1211. Second slot; 122. Positioning plate; 13. Movable member; 131. Sliding column; 132. Limiting member; 133. Limiting plate; 14. Steel wire rope; 15. Pressure sensor; 16. Limiting body; 17. Electrode joint; 18. Insulating sleeve; 2. Temperature measuring device; 31. Spherical bearing; 32. Bending ball die; 33. Guiding mechanism; 41. Moving frame; 42. Vertical driving device; 43. Horizontal driving device; 5. Linear slide rail; 61. First slide table; 62. Mounting seat; 63. Lead screw; 64. First motor; 71. Second slide table; 72. Second motor; 73. Transmission member; 74. First bevel gear; 75. Second bevel gear; 8. Frame body; 9. Metal tube. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0050] The following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0051] In the description of the present invention, it should be understood that the terms "center", "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0052] The terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features.

[0053] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] As Figures 1-6 shown, in a schematic embodiment of the electro-assisted bending forming device for metal tubes of the present invention, the electro-assisted bending forming device for metal tubes at least includes:

[0055] A front conductive member 11, which is provided with a first slot 111 for inserting a metal tube 9.

[0056] A rear conductive member 12, including: a conductive sleeve 121, which is provided with a second slot 1211 for inserting a metal tube 9. A positioning plate 122, which is fixed inside the conductive sleeve 121.

[0057] A movable member 13, including: a sliding column 131, which passes through the positioning plate 122 and is slidably connected to the positioning plate 122, and the sliding direction is the axial direction of the conductive sleeve 121. A limiting member 132, which is located inside the conductive sleeve 121 and is connected to one end of the sliding column 131.

[0058] Filling particles are filled inside the metal tube 9, not shown in the figure.

[0059] Steel wire rope 14, one end is connected to the movable part 13, and the other end passes through the front conductive part 11 and is connected to the front conductive part 11.

[0060] Pressure sensor 15 abuts against the side of the limiting part 132 away from the sliding column 131. The pressure sensor 15 is connected to the display device by wire or wirelessly, so that the user can read the detection result of the pressure sensor 15. The display device is not shown in the figure.

[0061] Limiting body 16 is connected to the conductive sleeve 121 and abuts against the side of the pressure sensor 15 away from the limiting part 132.

[0062] The method for adjusting the pressure inside the metal tube 9 is: changing the connection position of the limiting body 16 in the axial direction of the conductive sleeve 121, or changing the connection position of the front conductive part 11 on the steel wire rope 14.

[0063] When using the above metal tube electro-assisted bending forming device to perform bending forming of the metal tube 9, it is necessary to fill the inside of the metal tube 9 with filling particles, and insert the two ends of the metal tube 9 into the first slot 111 and the second slot 1211 respectively, so that the front conductive part 11 and the rear conductive part 12 are respectively connected to the two ends of the metal tube 9; Subsequently, tighten the steel wire rope 14 between the front conductive part 11 and the rear conductive part 12 to make the metal tube 9 have a certain pressure inside; Then, connect the front conductive part 11 and the rear conductive part 12 to the positive and negative electrodes of the power supply respectively, so that there is a flowing current on the wall of the metal tube 9 to improve the plasticity of the metal tube 9; Finally, apply force to the metal tube 9 to make the metal tube 9 bend.

[0064] During the bending forming of the metal tube 9, the pressure sensor 15 is clamped between the limiting body 16 and the movable part 13, and the filling particles in the pipeline transmit pressure to the pressure sensor 15 through the movable part 13, so that the detection result of the pressure sensor 15 can reflect the pressure inside the metal tube 9. The user adjusts the pressure inside the metal tube 9 based on the detection result of the pressure sensor 15 to keep the pressure inside the metal tube 9 constant during the bending forming process, which can avoid problems such as uneven distribution of particles inside the tube, local particle support failure of the pipe fitting, and unstable bending deformation of the pipe fitting, and improve the bending forming accuracy of the pipe.

[0065] In some embodiments, the positioning plate 122 and the conductive sleeve 121 are integrally formed to improve the structural strength of the rear conductive part 12.

[0066] In some of these embodiments, the movable member 13 further includes: a limiting plate 133, located outside the conductive sleeve 121, connected to the other end of the sliding column 131, and slidably engaged with the inner wall of the metal tube 9. All the filling particles in the tube are located on the side of the limiting plate 133 away from the rear conductive member 12, and the pressure from the filling particles will all be transmitted radially along the movable member 13 to the pressure sensor 15, so as to further improve the detection accuracy of the pressure sensor 15 for the pressure in the tube.

[0067] In some of these embodiments, the metal tube electro-assisted bending forming device further includes: an electrode connector 17, connected to the conductive sleeve 121.

[0068] In some of these embodiments, the metal tube electro-assisted bending forming device further includes: a temperature measuring device 2, used to detect the temperature of the metal tube 9. The user can adjust the current in real time according to the detection result of the temperature measuring device 2, so that during the bending forming of the metal tube 9, the temperature of the metal tube 9 is always maintained within a preset temperature range, thereby further improving the bending forming accuracy.

[0069] Further, the temperature measuring device 2 detects the temperature of the metal tube 9 by non-contact temperature measurement means to avoid affecting the measurement accuracy of the pressure sensor 15. The temperature measurement principle of the temperature measuring device 2 includes but is not limited to infrared radiation, microwave, laser, and ultrasonic wave.

[0070] In some of these embodiments, the limiting body 16 is threadedly connected to the inner side of the conductive sleeve 121. The limiting body 16 applies pressure to the filling particles in the metal tube 9 through the pressure sensor 15 and the movable member 13. The user can adjust the threaded connection length between the limiting body 16 and the conductive sleeve 121 to change the connection position of the limiting body 16 in the axial direction of the conductive sleeve 121, thereby adjusting the pressure in the metal tube 9.

[0071] Further, the limiting body 16 is insulated from the conductive sleeve 121, and the pressure sensor 15 is insulated from the conductive sleeve 121. Specifically, an insulating sleeve 18 is fixed inside the conductive sleeve 121. The pressure sensor 15, the limiting member 132, and the limiting body 16 are all located inside the insulating sleeve 18. The sliding column 131 passes through the insulating sleeve 18 and is connected to the limiting member 132, and the limiting body 16 is threadedly connected to the insulating sleeve 18.

[0072] In some of these embodiments, the metal tube electro-assisted bending forming device further includes:

[0073] A spherical bearing 31, driven by a forming drive device to perform vertical movement and horizontal movement.

[0074] A bending ball die 32, connected to the inner ring of the spherical bearing 31, and having a tube forming channel inside.

[0075] The guiding mechanism 33 is connected to the bending ball die 32 and has a pipe guiding channel communicating with the pipe forming channel.

[0076] Among them, the spherical bearing 31, the bending ball die 32 and the guiding mechanism 33 are the basic structures of the current three-dimensional electric-assisted bending forming of metal pipes. The spherical bearing 31, the bending ball die 32 and the guiding mechanism 33 are all described in Chinese patents CN207615432U and CN216068654U, and will not be elaborated here.

[0077] Currently, the particle filling technology is mainly applied to the bending forming of the metal pipe 9. Particle filling can reduce the wall thickness thinning and cross-section distortion problems of the bent pipe finished product. However, the bending technology can only achieve the single-segment fixed curvature bending of the pipe and cannot achieve the continuous variable curvature integrated bending forming. The free bending forming technology belongs to the incremental forming technology. Although it can achieve the continuous forming of multi-plane variable curvature, due to the difficulty of filling, the forming quality is generally average. For example: the friction, embedding and stress transfer mechanisms between the particles and the pipe wall are difficult to control. High friction coefficient particles will cause scratches on the pipe surface or local stress concentration, resulting in a decrease in the service life of the bent metal pipe 9. The particles need to bear both the supporting and deformation coordination functions at the same time. During the bending process, the particles will displace due to centrifugal force or vibration. When the bending radius is too small, the migration rate of the particles to the inner side is as high as 40%, resulting in an increase in the wall thickness thinning rate of the outer side by 25%. Uneven particle distribution and changes in filling pressure will cause asymmetric deformation, resulting in insufficient local support and local instability, and the ellipticity of the pipe cross-section exceeding 15%. The particle filling needs to match the bending speed of the metal pipe 9. When bending at high speed (such as >10° / s), the filling efficiency will be insufficient. At the same time, high-pressure filling is likely to cause particle densification, but it will increase the tensile stress on the outer wall of the pipe; low-pressure filling provides insufficient support. If the pressure is not regulated, during the bending process, a filling pressure fluctuation of ±5 MPa will cause a 20% difference in particle density, directly affecting the springback stability of the metal pipe 9 and resulting in a 10% - 15% increase in the springback error of the metal pipe 9.

[0078] And the above-mentioned metal pipe electric-assisted bending forming device can realize the in-pipe pressure monitoring and pressure adjustment during the three-dimensional bending forming of the metal pipe 9, which helps to keep the in-pipe pressure constant during the three-dimensional bending forming of the metal pipe 9 and improve the three-dimensional bending forming accuracy of the metal pipe 9.

[0079] The following bending test was carried out on an aluminum alloy pipe (outer diameter 20 mm, wall thickness 1.5 mm) filled with steel particles (diameter 1 mm) using the above-mentioned metal pipe electric-assisted bending forming device:

[0080] Under constant pressure conditions (pressure fluctuation ±2%), the collapse depth is 0.3 mm and the ovality is 5%; when the pressure fluctuation is ±10%, the collapse depth increases to 1.2 mm and the ovality reaches 20%; the inner migration rate is as high as 35%, and the outer density decreases by 40%, resulting in the wall thickness reduction rate on the outer side increasing from 10% under constant pressure to 35%; the springback angle increases from 2.5° to 4.2°, and the peak residual stress increases from 180 MPa to 260 MPa.

[0081] It can be seen that non-constant filling pressure will cause the collapse depth to increase by 300%, the wall thickness reduction rate to double, the springback angle error to expand by 68%, and the rejection rate to increase significantly (such as from 2.3% to 17.6%). Through dynamic pressure control and particle modification, the quality can be significantly improved. In practical applications, the pressure stability needs to be controlled within ±5% to meet the requirements of high-precision bent pipe forming.

[0082] Furthermore, the temperature measurement position of the temperature measurement device 2 is located on the side of the guiding mechanism 33 away from the bending ball die 32.

[0083] Furthermore, the forming driving device includes:

[0084] A moving frame 41, connected to the spherical bearing 31;

[0085] A vertical driving device 42, used to drive the moving frame 41 to perform vertical linear movement;

[0086] A horizontal driving device 43, used to drive the vertical driving device 42 to perform horizontal linear movement.

[0087] Furthermore, both the vertical driving device 42 and the horizontal driving device 43 are lead screw 63 slide table modules driven by motors, which are common structures in the art and will not be elaborated here.

[0088] In some embodiments, the front conductive member 11 is located on the side of the bending ball die 32 away from the guiding mechanism 33, and the rear conductive member 12 is located on the side of the guiding mechanism 33 away from the bending ball die 32. The structure of the rear conductive member 12 is more complex and heavier than that of the front conductive member 11. Setting the rear conductive member 12 behind the bending ball die 32 can reduce the possibility of the bent part of the metal tube 9 being deformed by the gravity of the front end of the metal tube 9, which helps to improve the forming accuracy of the metal tube 9.

[0089] In some embodiments, the metal tube electro-assisted bending forming device further includes:

[0090] A linear slide rail 5, with a fixed position, parallel to the axis of the guiding mechanism 33.

[0091] A first slide table 61, connected to the conductive sleeve 121, and slidably connected to the linear slide rail 5.

[0092] The first driving device is used to drive the first sliding table 61 to move along the linear slide rail 5;

[0093] The second driving device moves along with the first sliding table 61 and is used to drive the limiting body 16 to rotate so as to change the depth of the limiting body 16 screwed into the conductive sleeve 121.

[0094] When performing three-dimensional electro-assisted bending forming using the above metal tube electro-assisted bending forming device, through the cooperation of the linear slide rail 5 and the first sliding table 61, the rotation of the conductive sleeve 121 is limited and the linear movement direction of the conductive sleeve 121 is limited; the first driving device pushes the metal tube 9 into the bending ball die 32 through the first sliding table 61 and the conductive sleeve 121; the second driving device changes the position of the limiting body 16 in the axial direction of the conductive sleeve 121 so as to change the pressure inside the metal tube 9.

[0095] Furthermore, two linear slide rails 5 are provided, and the two linear slide rails 5 are respectively located on both sides of the axis of the rear conductive part 12. The first sliding table 61 is slidably connected to the two linear slide rails 5.

[0096] In some embodiments, the first driving device includes:

[0097] The mounting seat 62 has a fixed position.

[0098] The lead screw 63 is parallel to the linear slide rail 5, passes through the first sliding table 61, is threadedly connected to the first sliding table 61, and is rotatably connected to the mounting seat 62 at both ends.

[0099] The first motor 64 drives the lead screw 63 to rotate so as to drive the first sliding table 61 to slide on the lead screw 63.

[0100] In some embodiments, the second driving device includes:

[0101] The second sliding table 71 is slidably connected to the linear slide rail 5, is passed through by the lead screw 63, and is threadedly connected to the lead screw 63.

[0102] The transmission member 73 is inserted into the limiting body 16 in a direction parallel to the axis of the conductive sleeve 121.

[0103] The second motor 72 is installed on the second sliding table 71 and drives the transmission member 73 to rotate so as to drive the limiting body 16 to rotate.

[0104] Furthermore, the second sliding table 71 is located on the side of the first sliding table 61 away from the guiding mechanism 33, and the first motor 64 is located on the side of the second sliding table 71 away from the first sliding table 61, so as to prevent the first motor 64 from interfering with the three-dimensional bending forming of the metal tube 9.

[0105] Furthermore, the second driving device further includes:

[0106] The first bevel gear 74 is connected to the output shaft of the second motor 72.

[0107] The second bevel gear 75 meshes with the first bevel gear 74, is rotatably connected to the second slide 71, is fixedly connected to the transmission member 73, is collinear with the axis of the transmission member 73, and is perpendicular to the axis of the first bevel gear 74.

[0108] Through the cooperation of the first bevel gear 74 and the second bevel gear 75, the installation position of the second motor 72 is changed, so that the first motor 64 and the second motor 72 do not need to be installed side by side, and the installation spaces of the first motor 64 and the second motor 72 do not overlap, which is convenient for the disassembly, assembly and maintenance of the first motor 64 and the second motor 72.

[0109] In some embodiments, the metal tube electro-assisted bending forming device further includes a controller. The preset pressure range and the preset temperature range are input into the controller. The controller is connected to the power supply, the temperature measuring device 2, the pressure sensor 15, the first motor 64 and the second motor 72. The controller controls the start and stop of the second motor 72 based on the detection result of the pressure sensor 15 and the preset pressure range to maintain the constant pressure inside the metal tube 9. The controller adjusts the output current of the power supply based on the detection result of the temperature measuring device 2 and the preset temperature range to maintain the constant temperature of the metal tube 9. The metal tube electro-assisted bending forming device enables the automatic regulation of the pressure inside the metal tube 9 and the temperature adjustment of the metal tube 9 during the bending forming process of the metal tube 9, which helps to improve the response speed and response accuracy of the pressure inside the tube and the tube body temperature to the pressure sensor 15 and the temperature measuring device 2. The controller is not shown in the figure.

[0110] Furthermore, the controller is connected to the first motor 64, the vertical driving device 42 and the horizontal driving device 43 to adjust the bending shape and bending rate of the metal tube 9.

[0111] In some embodiments, the metal tube electro-assisted bending forming device further includes:

[0112] The frame 8 is fixed in position and is used to install the guiding mechanism 33, the linear slide rail 5, the forming driving device, the temperature measuring device 2 and the mounting seat 62.

[0113] The present invention also provides a metal tube electro-assisted bending forming method. Using the above metal tube electro-assisted bending forming device, both ends of the metal tube 9 are inserted into the first slot 111 and the second slot 1211, the inside of the metal tube 9 is filled with particles, and the steel wire rope 14 is tightened. The front conductive member 11 and the rear conductive member 12 are connected to the power supply. Subsequently, a force is applied to the metal tube 9 to make it bend, and the pressure inside the metal tube 9 is dynamically adjusted during the bending forming process of the metal tube 9, so that the detection result of the pressure sensor 15 is maintained within the preset pressure range.

[0114] In some of these embodiments, during the bending and forming of the metal tube 9, the real-time temperature of the metal tube 9 is detected, and the current input to the metal tube 9 is dynamically adjusted to maintain the temperature of the metal tube 9 within a preset temperature range.

[0115] Furthermore, the power supply provides a periodic pulsed current to the metal tube 9, and the current parameters are adjustable. The current parameters include current density, frequency, and pulse width.

[0116] Furthermore, after the temperature of the metal tube 9 is within the preset temperature range, the bending and forming of the metal tube 9 is carried out.

[0117] Through the description of multiple embodiments of the electro-assisted bending and forming device and method for metal tubes of the present invention, it can be seen that the embodiments of the electro-assisted bending and forming device and method for metal tubes of the present invention have at least one or more of the following advantages:

[0118] 1. During the bending and forming of the metal tube 9, the pressure sensor 15 is clamped between the limiting body 16 and the movable part 13, and the filling particles in the pipeline transmit pressure to the pressure sensor 15 through the movable part 13, so that the detection result of the pressure sensor 15 can reflect the pressure inside the metal tube 9. The user adjusts the pressure inside the metal tube 9 based on the detection result of the pressure sensor 15 to keep the pressure inside the metal tube 9 constant during the bending and forming process, which can avoid problems such as uneven distribution of particles inside the tube, local particle support failure of the pipe fitting, and unstable bending deformation of the pipe fitting, and improve the bending accuracy of the pipe.

[0119] 2. During the bending and forming of the metal tube 9, the real-time temperature of the metal tube 9 is detected, and the current input to the metal tube 9 is dynamically adjusted to maintain the temperature of the metal tube 9 within a preset temperature range, thereby further improving the bending accuracy of the pipe.

[0120] 3. The regulation of the pressure inside the metal tube 9 and the temperature adjustment of the metal tube 9 during the bending and forming of the metal tube 9 can both be automatically adjusted, which helps to improve the response speed and response accuracy of the pressure inside the tube and the tube body temperature to the pressure sensor 15 and the temperature measuring device 2.

[0121] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and the key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0122] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: still can modify the specific implementation manners of the present invention or make equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A metal tube electrically assisted bending and forming device, characterized in that: include: The front conductive member is provided with a first slot for inserting the metal tube; The rear conductive member includes: a conductive sleeve having a second slot for inserting the metal tube; and a positioning plate fixed inside the conductive sleeve; The movable part includes: a sliding column, which passes through the positioning plate and is slidably connected with the positioning plate, and the sliding direction is the axial direction of the conductive sleeve; a limiting member, which is located in the conductive sleeve and is connected with one end of the sliding column; Filling particles are filled inside the metal tube; A steel wire rope, one end of which is connected to the movable member, and the other end of which passes through the front conductive member and is connected to the front conductive member; The pressure sensor is in contact with a side of the limiter away from the sliding column; A limiting body is connected to the conductive sleeve and abuts against a side of the pressure sensor away from the limiting member; The method for adjusting the pressure in the metal tube is to change the connection position of the limiter on the axial direction of the conductive sleeve, or to change the connection position of the front conductive member on the wire rope.

2. The metal tube electrically assisted bending and forming device according to claim 1, characterized in that: The movable part also includes: a limit plate, which is located outside the conductive sleeve, connected to the other end of the sliding column, and slidingly matched with the inner wall of the metal tube.

3. The metal tube electrically assisted bending and forming device according to claim 1, characterized in that: Also includes: Temperature measuring device, used to detect the temperature of metal pipes.

4. The metal tube electrically assisted bending and forming device according to any one of claims 1 to 3, characterized in that: The limiting body is threadedly connected to the inner side of the conductive sleeve.

5. The metal tube electrically assisted bending and forming device according to claim 4, characterized in that: Also includes: Spherical bearings; A curved ball mold connected to the inner ring of the spherical bearing and having a tube forming channel inside; The guide mechanism is connected with the bending ball mold and has a pipe guide channel communicated with the pipe forming channel.

6. The metal tube electrically assisted bending and forming device according to claim 5, characterized in that: The front conductive member is located at a side of the curved ball mold away from the guide mechanism, and the rear conductive member is located at a side of the guide mechanism away from the curved ball mold.

7. The metal tube electrically assisted bending and forming device according to claim 6, characterized in that: Also includes: Linear guide rails, fixed in position and parallel to the axis of the guide mechanism; A first slide is connected to the conductive sleeve and is slidably connected to the linear slide rail; A first driving device, used for driving the first slide to move along the linear slide rail; The second driving device moves with the first slide and is used for driving the limiting body to rotate so as to change the depth of the limiting body screwed into the conductive sleeve.

8. The metal tube electrically assisted bending and forming device according to claim 7, characterized in that: The first driving device includes: a mounting seat, which is fixed in position; a lead screw, which is parallel to the linear slide rail and is threadedly connected to the first slide table, and has two ends rotatably connected to the mounting seat; and a first motor, which drives the lead screw to rotate.

9. The metal tube electrically assisted bending and forming device according to claim 8, characterized in that: The second driving device includes: a second slide table, slidably connected to the linear slide rail and threadedly connected to the lead screw; The second motor is installed on the second slide and drives the limiting body to rotate.

10. A method for electrically assisted bending of a metal tube, characterized in that: Using the metal tube electrically assisted bending and forming device as described in any one of claims 1 to 9, the two ends of the metal tube are inserted into the first slot and the second slot, particles are filled in the metal tube, and the wire rope is tightened; the front conductive part and the rear conductive part are connected to a power source; then force is applied to the metal tube to make it bend, and the pressure in the metal tube is dynamically adjusted during the bending and forming of the metal tube so that the detection result of the pressure sensor is maintained within a preset pressure range.

Images