Large-diameter pipe impact deformation connecting device and connecting method
By using a contoured flat coil for magnetic pulse connection of large-diameter pipe fittings, the problem that traditional magnetic pulse connection technology cannot adapt to large-size pipe fittings is solved, achieving efficient connection of large-size pipe fittings and improving connection efficiency and flexibility.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HARBIN INST OF TECH
- Filing Date
- 2026-04-14
- Publication Date
- 2026-06-09
AI Technical Summary
Existing magnetic pulse connection technology cannot achieve reliable connection of large-size pipe fittings. The size of traditional coil and magnet collector structures limits the discharge energy and current peak, resulting in a decrease in energy conversion efficiency and failing to meet the connection requirements of large-size pipe fittings.
A contoured flat coil is used instead of a traditional solenoid coil. By dispersing the overall circumferential deformation of the pipe fitting into several local deformation steps, the contoured flat coil is used to perform magnetic pulse connection of large-diameter pipe fittings. The contoured flat coil and the arc section of the pipe fitting are designed to be coaxial with the pipe fitting to be connected. A rotatable lifting platform is used to achieve circumferential rotation, and local deformation connection is performed step by step.
This technology expands the application range of magnetic pulse connection technology, avoids current peak and Lorentz force reduction caused by excessive coil size, achieves efficient connection of large-size pipe fittings, and is flexible and convenient to operate.
Smart Images
Figure CN122164819A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of metal pipe plastic processing technology, and in particular to a large-diameter pipe impact deformation connection device and connection method. Background Technology
[0002] Besides its advantages such as short processing time, high efficiency, easy energy control, and good repeatability, electromagnetic pulse (EMP) joining technology for pipe fittings can also achieve solid-state mechanical or metallurgical joining of dissimilar metal pipes at room temperature, which is difficult to achieve with conventional fusion welding. However, due to the limitations of the discharge processing capabilities of the forming equipment itself, current EMP joining technology is limited to connecting pipes with small diameters and thin wall thicknesses. In advanced manufacturing fields such as power transmission and aerospace, reliable connections of larger structural dimensions are often required, which current EMP joining technology cannot yet achieve.
[0003] In traditional magnetic pulse connection technology, the structural dimensions of the coil and magnet collector are closely related to the structural dimensions of the pipe to be connected. As the size of the pipe increases, the discharge energy and peak current required by the entire connection system further increase. Simply enlarging the structural dimensions of the coil and magnet collector inevitably increases the overall induction parameters of the system, leading to a decrease in energy conversion efficiency and peak current. In other words, the traditional connection mode relying on coils and magnet collectors cannot meet the requirements for discharge energy and peak current under large-size conditions. To realize the application of magnetic pulse connection technology in large-size pipes and leverage its key role in overall structural lightweighting and cost reduction, it is necessary to break through the existing technological deadlock and explore new methods for magnetic pulse connection of large-size pipes. Summary of the Invention
[0004] The purpose of this invention is to provide a large-diameter pipe impact deformation connection device and connection method to solve the problems existing in the prior art. By using a contoured flat plate coil for pipe magnetic pulse connection, the overall circumferential deformation of the pipe is dispersed into several local deformation steps, which greatly improves the application range of magnetic pulse connection technology.
[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides a large-diameter pipe impact deformation connection device, comprising a contoured flat coil, a pipe base, and a pipe support block. The contoured flat coil is mounted on a coil back plate. Both the coil back plate and the pipe support block are slidably disposed on a base plate, and the coil back plate and the pipe support block are respectively located on both sides of the pipe base. A rotatable lifting platform is also provided on the base plate, and the pipe base is mounted on the rotatable lifting platform. The pipe to be impact deformed and connected is coaxially disposed on the pipe base. The contoured flat coil has an inwardly concave arc segment, which is coaxially disposed with the pipe to be impact deformed and connected. The contoured flat coil is connected to a charging and discharging unit.
[0006] In one embodiment, the tube to be impact-deformed includes a flying tube and a base tube arranged coaxially, with the flying tube located around the base tube; the flying tube and the base tube are fixed by a tube base and are coaxially assembled with the arc segment of the contouring flat coil; the rotatable lifting platform is used to adjust the relative height between the tube to be impact-deformed and the contouring flat coil and to achieve circumferential rotation.
[0007] In one embodiment, the diameter of the cylinder containing the arc segment is larger than the diameter of the flying tube.
[0008] In one embodiment, the contoured flat coil includes a flat plate and a coil region. The coil region is fixed on the flat plate and has a T-shaped structure. The coil region includes a connecting end and a working section. The short side of the T-shaped structure is the connecting end, which is used to connect to a charging and discharging unit. The long side of the T-shaped structure is the working section. The middle part of the working section has an inwardly concave arc segment, and the center of the arc segment is located on the perpendicular bisector of the working section of the coil.
[0009] In one embodiment, a recessed area matching the shape of the coil area is provided around the coil area on the plate, and an insulating support block is placed in the recessed area.
[0010] In one embodiment, guide rails are provided on both sides of the rotatable lifting platform on the base plate, and the coil back plate and the tube support block are slidably assembled on the guide rails on both sides of the rotatable lifting platform.
[0011] In one embodiment, a first guide rail pad and a second guide rail pad are respectively provided on both sides of the rotatable lifting platform on the base plate, and guide rails are respectively provided on the first guide rail pad and the second guide rail pad; the bottom of the coil back plate and the tube support block are both fixed with grooved sliders, and the grooved sliders are slidably assembled on the guide rails.
[0012] In one embodiment, the connection end is provided with a lead wire adapter block, and the lead wire adapter block is connected to a positive coil lead and a negative coil lead respectively through positive and negative adapter posts.
[0013] In one embodiment, the positive and negative coil leads are respectively connected to the positive and negative poles in the charging and discharging unit; according to the principle of magnetic pulse forming process, when the capacitor bank in the charging and discharging unit is charged to a preset voltage value, the charging circuit is disconnected, the discharge trigger switch is opened to connect the auxiliary discharge gap, and the first step of discharge begins.
[0014] The present invention also provides a method for impact deformation connection of large-diameter pipes, applied to the above-mentioned impact deformation connection device for large-diameter pipes, comprising the following steps: Step 1: Clean the surface of the pipe fitting to be connected by impact deformation. The pipe fitting to be connected by impact deformation includes a fly tube and a base tube. Insulate the outer surface of the fly tube at the position where it mates with the contoured flat coil. Step 2: Concentrically fix the flying tube and the base tube to the pipe fitting base; Step 3: Push the contoured flat coil and the tube support block along the guide rail to the set position, and connect the coil lead to the charging and discharging unit; Step 4: Close the charging switch of the charging and discharging unit to charge the discharge capacitor bank. After reaching the preset voltage, disconnect the charging switch and open the discharge trigger switch to connect the auxiliary discharge gap and start the first step of discharge. According to the law of electromagnetic induction, the area where the outer surface of the flying tube matches the arc section of the contoured flat coil will generate an induced current. Under the action of the pulse magnetic field, the induced current is subjected to a radially inward Lorentz force and drives the deformation area of the flying tube to accelerate and collide with the base tube to form a connection. Step 5: After the first step of discharge is completed, disconnect the discharge control system to obtain the tube blank to be processed after the first step of connection; Step 6: Keeping the position of the forming coil unchanged, rotate the obtained first step connecting tube circumferentially by 15-60° so that the undeformed area of the tube blank to be processed enters the working area of the coil for subsequent discharge connection process; Step 7: Repeat the operation of step 6 until a complete circumferential connection of the pipe fittings is achieved.
[0015] The present invention achieves the following technical effects compared to the prior art: This invention discloses a large-diameter pipe impact deformation connection device and method. The connection device includes a contoured flat coil, a pipe base, and a pipe support block. The contoured flat coil is mounted on a coil back plate. Both the coil back plate and the pipe support block are slidably disposed on a base plate, with the coil back plate and the pipe support block located on opposite sides of the pipe base. A rotatable lifting platform is also provided on the base plate, and the pipe base is mounted on the rotatable lifting platform. The pipe to be impact deformed and connected is coaxially disposed on the pipe base. The contoured flat coil has an inwardly concave arc segment, which is coaxially disposed with the pipe to be impact deformed and connected. The contoured flat coil is connected to a charging and discharging unit. Using a contoured flat coil instead of a traditional solenoid coil for magnetic pulse connection of large-sized pipes avoids the decrease in current peak and Lorentz force caused by excessive geometric size. The design of the arc segment of the contoured flat coil makes it more suitable for the magnetic pulse connection process of pipes. By dispersing the overall circumferential deformation of the pipe into several local deformation steps, the application range of magnetic pulse connection technology can be greatly improved. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a schematic diagram of a large-diameter pipe impact deformation connection device (a pipe magnetic pulse connection device based on a contoured flat plate coil); Figure 2 A schematic diagram of the first step connection principle of the magnetic pulse for the pipe fittings of the large-diameter pipe impact deformation connection device; Figure 3 A schematic diagram illustrating the magnetic pulse connection principle of a large-diameter pipe impact deformation connection device. Figure 4 This is a top view of a contoured flat coil; Figure 5 An isometric drawing of a contoured flat coil; Figure 6 This is the front view of a contoured flat coil; Figure 7 A schematic diagram of the internal insulation support block of the contoured flat coil. Figure 1 ; Figure 8 A schematic diagram of the internal insulation support block of the contoured flat coil. Figure 2 ; Figure 9 This is a schematic diagram of the sliding base; In the diagram: 1. Coil backplate; 2. Contouring flat coil; 3. Flying tube; 4. Base tube; 5. Tube support block; 6. Guide rail; 7. First guide rail under pad; 8. Base plate; 9. Slider; 10. Rotatable lifting platform; 11. Tube base; 12. Positive coil lead; 13. Negative coil lead; 14. Second guide rail under pad; 15. Lead adapter block; 16. Current limiting resistor; 17. Discharge trigger switch; 18. Capacitor bank; 19. Insulation support block; 20. Arc section; 21. Working section; 22. Gap width; 23. Working area width. Detailed Implementation
[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0019] The purpose of this invention is to provide a large-diameter pipe impact deformation connection device and connection method to solve the problems existing in the prior art. By using a contoured flat plate coil for pipe magnetic pulse connection, the overall circumferential deformation of the pipe is dispersed into several local deformation steps, which greatly improves the application range of magnetic pulse connection technology.
[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0021] like Figures 1 to 9 As shown, the present invention provides a large-diameter pipe impact deformation connection device, including a contoured flat coil 2, a pipe base 11, and a pipe support block 5. The contoured flat coil 2 is mounted on a coil back plate 1. The coil back plate 1 and the pipe support block 5 are both slidably disposed on a base plate 8, and the coil back plate 1 and the pipe support block 5 are respectively located on both sides of the pipe base 11. A rotatable lifting platform 10 is also provided on the base plate 8, and the pipe base 11 is mounted on the rotatable lifting platform 10. The pipe to be impact deformed and connected is coaxially disposed on the pipe base 11. The contoured flat coil 2 is provided with an inwardly recessed arc section 20, and the arc section 20 is coaxially disposed with the pipe to be impact deformed and connected. The contoured flat coil 2 is connected to a charging and discharging unit.
[0022] Compared to conventional flat coils, the main feature of the contoured flat coil 2 lies in the design of its arc segment 20, making it more suitable for the magnetic pulse connection process of pipe fittings. Conventional flat coils are generally used for magnetic pulse connection of plates. The innovation of this contoured flat coil 2 is that it specifically improves this type of coil for magnetic pulse connection of pipe fittings. Using a flat coil with a contoured structure to replace the traditional solenoid coil for magnetic pulse connection of pipe fittings avoids the current peak and Lorentz force reduction caused by the excessive geometric size of the solenoid coil. The traditional magnetic pulse connection process of pipe fittings is generally based on solenoid coils, and the deformation of its flying tube 3 is a circumferential, overall synchronous deformation. In contrast, the asymptotic deformation principle based on the contoured flat coil 2 is as follows: Figure 2 , Figure 3 As shown, after a partial connection is achieved by a single discharge, the unconnected area of the tube is brought into the working area of the coil by circumferential rotation. The connection of the new area can be achieved by another discharge. This method disperses the overall circumferential deformation into several steps of local deformation. By dispersing the overall circumferential deformation of the tube into several steps of local deformation, the size application range of magnetic pulse connection technology can be greatly improved.
[0023] In one embodiment, the tube to be impact-deformed includes a flying tube 3 and a base tube 4 arranged coaxially, with the flying tube 3 located around the base tube 4. The flying tube 3 and the base tube 4 are fixed by a tube base 11 and coaxially assembled with the arc section 20 of the contoured flat coil 2. A rotatable lifting platform 10 is used to adjust the relative height between the tube to be impact-deformed and the contoured flat coil 2 and to achieve circumferential rotation. The center of the arc section 20 of the contoured flat coil 2 is located on the vertical axis of the coil working section 21, and its diameter is slightly larger than that of the flying tube 3. During processing, the tube base 11 is fixed at a position concentric with the arc section 20 of the contoured flat coil 2, and the flying tube 3 and the base tube 4 are coaxially fixed on the tube base 11 and coaxial with the arc section 20.
[0024] In one embodiment, the contoured flat coil 2 includes a flat plate and a coil region. The coil region is fixed on the flat plate and adopts a T-shaped structure. The coil region includes a connecting end and a working section 21. The short side of the T-shaped structure is the connecting end, which is used to connect to the charging and discharging unit. The long side of the T-shaped structure is the working section 21. The middle part of the working section 21 is provided with an inwardly concave arc section 20. The center of the arc section 20 is located on the vertical line of the working section 21.
[0025] The plate has recessed areas around the coil area that match the shape of the coil area, and an insulating support block 19 is placed in the recessed area.
[0026] The basic structure of the contoured flat coil 2 is as follows: Figure 4-6As shown, the center of the arc segment 20 is located on the perpendicular bisector of the working section 21 of the coil. Its main structural parameters include the gap width 22, the working area width 23, the working area length, the length of the arc segment 20, and the coil thickness. The working area width 23 depends on the required deformation range of the fitting and is generally 5-15mm. The gap width 22 is generally 1-3 times the working area width 23. The working area length is generally 100-200mm, and its value must exceed the length of the arc segment 20. The length of the arc segment 20 depends on how many discharges are needed to achieve the circumferential connection and corresponds to the rotation angle after each discharge. The central angle of the arc segment 20 is generally 15-60°, and the specific length is related to the diameter of the fitting and the diameter of the arc segment 20. The coil thickness is generally 10-20mm.
[0027] The coil arc section 20 is coaxially fitted with the tube to achieve relative uniformity of the Lorentz force on the deformed area of the tube during deformation. The non-connected area of the tube has a tube support block 5, which is mechanically fixed to another set of guide rails 6. The guide rails 6 enable linear movement and support the tube during the collision connection process, preventing changes in the concentricity of the inner and outer tubes due to impact. During the connection process, both the coil back plate 1 and the tube support block 5 are subjected to sufficient pressure. The contoured flat coil 2 has an insulating support block 19 that mates with it. During the magnetic pulse connection process, while the tube is subjected to the Lorentz force, the coil also experiences a corresponding reaction force. The insulating support block 19, through its tight fit with the inner side of the coil, counteracts the reaction force experienced by the coil during the connection process, preventing coil deformation.
[0028] In one embodiment, guide rails 6 are provided on both sides of the rotatable lifting platform 10 on the substrate 8. The coil back plate 1 and the tube support block 5 are slidably mounted on the guide rails 6 on both sides of the rotatable lifting platform 10. A first guide rail lower pad 7 and a second guide rail lower pad 14 are provided on both sides of the rotatable lifting platform 10 on the substrate 8, and guide rails 6 are respectively provided on the first guide rail lower pad 7 and the second guide rail lower pad 14. A grooved slider 9 is fixed to the bottom of both the coil back plate 1 and the tube support block 5, and the grooved slider 9 is slidably mounted on the guide rail 6. The contoured flat coil 2 is machined from a high conductivity, high strength copper alloy and is fixed on the coil back plate 1. The coil back plate 1 cooperates with the guide rail 6 through the slider 9 and can move linearly on the guide rail 6 to realize the adjustment of the radial gap between the tube to be connected and the coil.
[0029] In one embodiment, a lead wire adapter block 15 is provided at the connecting end. The lead wire adapter block 15 is connected to the positive coil lead 12 and the negative coil lead 13 through positive and negative adapter posts, respectively. The positive coil lead 12 and the negative coil lead 13 are connected to the positive and negative poles in the charging and discharging unit, respectively. According to the principle of magnetic pulse forming process, when the capacitor bank 18 is charged to a preset voltage value, such as 3-20 kV, the charging circuit is disconnected, the discharge trigger switch 17 is opened to connect the auxiliary discharge gap, and the first step of discharge is started. According to the law of electromagnetic induction, the area where the outer surface of the flying tube 3 matches the coil arc section 20 will generate a huge induced current. Under the action of the pulse magnetic field, the induced current is subjected to a radially inward Lorentz force and drives the deformation area of the flying tube 3 (the tube material in a certain circumferential range on the flying tube 3 corresponding to the coil arc section 20, the size of the range depends on the length of the coil arc) to accelerate and collide with the base tube 4 to form a connection. After the first step of connection is completed, the tube is rotated 15-60° in the circumferential direction so that the undeformed area of the tube to be processed enters the working area of the coil, and the discharge operation is repeated until the circumferential connection of the tube is achieved. The above connection process is different from the traditional tube connection process in which a single discharge achieves a complete circumferential connection. It disperses the overall circumferential deformation process into several coordinated local deformations. Therefore, it is possible to achieve magnetic pulse connection of large-sized tubes without increasing the coil size, but through the accumulation of deformation.
[0030] The method for connecting large-diameter pipes by impact deformation includes the following steps: Step 1: Clean the surface of the pipe fitting to be connected by impact deformation. The pipe fitting to be connected by impact deformation includes flying tube 3 and base tube 4. Insulate the outer surface of the flying tube 3 at the position where it mates with the contoured flat coil 2. Step 2: Concentrically fix the flying tube 3 and the base tube 4 onto the pipe base 11; Step 3: Push the contoured flat coil 2 and the tube support block 5 into the set position along the guide rail 6, and connect the coil lead to the charging and discharging unit; Step 4: Close the charging switch of the charging and discharging unit. The high-voltage power supply charges the discharge capacitor bank 18 through the high-voltage rectifier bridge and the current-limiting resistor 16. After reaching the preset voltage, disconnect the charging switch and open the discharge trigger switch 17 to connect the auxiliary discharge gap and start the first step of discharge. According to the law of electromagnetic induction, the area where the outer surface of the flying tube 3 matches the arc section 20 of the contoured flat coil 2 will generate an induced current. Under the action of the pulse magnetic field, the induced current is subjected to a radially inward Lorentz force and drives the deformation area of the flying tube 3 to accelerate and collide with the base tube 4 to form a connection. Step 5: After the first step of discharge is completed, disconnect the discharge control system to obtain the tube blank to be processed after the first step of connection; Step 6: Keeping the position of the forming coil unchanged, rotate the obtained first step connecting tube circumferentially by 15-60° so that the undeformed area of the tube blank to be processed enters the working area of the coil for subsequent discharge connection process; Step 7: Repeat the operation of step 6 until a complete circumferential connection of the pipe fittings is achieved.
[0031] Example 1 The aluminum alloy tubing, grade 5A06, has an outer diameter of 264mm and a wall thickness of 2mm. Following the contour design principle, the diameter of the arc section 20 of the contoured flat coil 2 is designed to be 265mm (0.5mm distance between the tubing and the coil). The cross-sectional dimensions of the working section 21 of the contoured flat coil 2 are 14×10mm, the depth of the arc section 20 is 6mm, and the arc length is 78mm. Equipment conditions: The maximum discharge voltage and maximum discharge energy are 20kV and 20kJ, respectively.
[0032] The first deformation connection was successfully achieved at a discharge voltage of 12kV. After the connection, the pipe was rotated 30° in the circumferential direction and the discharge voltage was 12kV. The subsequent deformation connection process was successfully achieved, and a connected sample with no surface defects and good connection quality was obtained.
[0033] This invention proposes a large-diameter pipe impact deformation connection device and method. Compared with existing pipe fitting electromagnetic pulse connection methods, the technical solution has the following advantages: (1) Using a flat plate coil with a contoured structure instead of a traditional solenoid coil for magnetic pulse connection of pipe fittings avoids the current peak and Lorentz force reduction caused by the excessive geometric size of the solenoid coil; (2) By dispersing the overall circumferential deformation of the pipe fitting into several local deformation steps, the dimensional application range of the magnetic pulse connection technology can be greatly improved; the traditional magnetic pulse connection process for pipe fittings is generally based on solenoid coils, and the deformation of its flying tube 3 is a circumferential overall synchronous deformation, based on the asymptotic deformation principle of the contoured flat coil 2, as follows Figure 2 , Figure 3 As shown, after a partial connection is achieved by a single discharge, the unconnected area of the tube is brought into the working area of the coil by circumferential rotation. The connection of the new area can be achieved by another discharge. This method disperses the overall circumferential deformation into several steps of local deformation.
[0034] (3) The contouring structure of the contouring flat coil 2 realizes the coordinated control of the spatial magnetic field force and the geometric features of the pipe, and can obtain a more uniform deformation state of the pipe. The traditional flat coil structure has a straight structure throughout the working section 21 of the coil, which is more suitable for the magnetic pulse connection process of the plate. However, when connecting the pipe, this straight structure will cause the relative distance between different positions on the pipe and the coil to be different, thus affecting the deformation connection effect. The contouring structure of the contouring flat coil 2 refers to the structure of the arc section 20 of the coil. This part of the structure is matched with the geometric dimensions of the pipe, so that the relative distance between different positions on the pipe and the coil is roughly the same, thereby obtaining a more uniform deformation state of the pipe.
[0035] (4) The contoured flat coil 2 and the pipe fitting are connected by a slide rail and a rotatable lifting platform 10, which can realize local feature connection of different coil-pipe fitting relative distances at different axial positions of the pipe fitting, making the control flexible and the operation convenient. (5) The non-connection area of the pipe fitting has an insulating support block 19 that matches the pipe fitting, which can counteract the inertial effect during the collision connection process and prevent changes in concentricity.
[0036] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.
Claims
1. A large-diameter pipe impact deformation connection device, characterized in that: The device includes a contoured flat coil, a tube base, and a tube support block. The contoured flat coil is mounted on a coil back plate. Both the coil back plate and the tube support block are slidably disposed on a base plate, and the coil back plate and the tube support block are located on opposite sides of the tube base. A rotatable lifting platform is also provided on the base plate, and the tube base is mounted on the rotatable lifting platform. The tube to be impact-deformed and connected is coaxially disposed on the tube base. The contoured flat coil has an inwardly recessed arc section, which is coaxially disposed with the tube to be impact-deformed and connected. The contoured flat coil is connected to a charging and discharging unit.
2. The large-diameter pipe impact deformation connection device according to claim 1, characterized in that: The tube to be impact-deformed includes a flying tube and a base tube arranged coaxially, with the flying tube located around the base tube; the flying tube and the base tube are fixed by a tube base and are coaxially assembled with the arc section of the contouring flat coil; the rotatable lifting platform is used to adjust the relative height between the tube to be impact-deformed and the contouring flat coil and to achieve circumferential rotation.
3. The large-diameter pipe impact deformation connection device according to claim 2, characterized in that: The diameter of the cylinder containing the arc segment is larger than the diameter of the flying tube.
4. The large-diameter pipe impact deformation connection device according to claim 1, characterized in that: The contoured flat coil includes a flat plate and a coil region. The coil region is fixed on the flat plate and adopts a T-shaped structure. The coil region includes a connecting end and a working section. The short side of the T-shaped structure is the connecting end, which is used to connect to the charging and discharging unit. The long side of the T-shaped structure is the working section. The middle part of the working section is provided with an inwardly concave arc section. The center of the arc section is located on the perpendicular bisector of the working section of the coil.
5. The large-diameter pipe impact deformation connection device according to claim 4, characterized in that: The plate has recessed areas around the coil area that match the shape of the coil area, and an insulating support block is placed in the recessed areas.
6. The large-diameter pipe impact deformation connection device according to claim 1, characterized in that: Guide rails are provided on both sides of the rotatable lifting platform on the base plate, and the coil back plate and the tube support block are slidably assembled on the guide rails on both sides of the rotatable lifting platform.
7. The large-diameter pipe impact deformation connection device according to claim 6, characterized in that: The base plate is provided with a first guide rail lower pad and a second guide rail lower pad on both sides of the rotatable lifting platform. The first guide rail lower pad and the second guide rail lower pad are respectively provided with guide rails. The bottom of the coil back plate and the tube support block are both fixed with grooved sliders, and the grooved sliders are slidably assembled on the guide rails.
8. The large-diameter pipe impact deformation connection device according to claim 4, characterized in that: The connection end is provided with a lead wire adapter block, and the positive coil lead and the negative coil lead are respectively connected to the lead wire adapter block through positive and negative adapter posts.
9. The large-diameter pipe impact deformation connection device according to claim 8, characterized in that: The positive and negative coil leads are respectively connected to the positive and negative poles in the charging and discharging unit. According to the principle of magnetic pulse forming process, when the capacitor bank in the charging and discharging unit is charged to the preset voltage value, the charging circuit is disconnected, the discharge trigger switch is opened to connect the auxiliary discharge gap, and the first step of discharge is started.
10. A method for impact deformation connection of large-diameter pipes, applied to the impact deformation connection device for large-diameter pipes according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Clean the surface of the pipe fitting to be connected by impact deformation. The pipe fitting to be connected by impact deformation includes a fly tube and a base tube. Insulate the outer surface of the fly tube at the position where it mates with the contoured flat coil. Step 2: Concentrically fix the flying tube and the base tube to the pipe fitting base; Step 3: Push the contoured flat coil and the tube support block along the guide rail to the set position, and connect the coil lead to the charging and discharging unit; Step 4: Close the charging switch of the charging and discharging unit to charge the discharge capacitor bank. After reaching the preset voltage, disconnect the charging switch, open the discharge trigger switch to connect the auxiliary discharge gap, and start the first step of discharge. According to the law of electromagnetic induction, an induced current will be generated in the area where the outer surface of the flying tube matches the arc section of the contoured flat coil. Under the action of the pulsed magnetic field, the induced current is subjected to a radially inward Lorentz force, which drives the deformation zone of the flying tube to accelerate and collide with the base tube to form a connection. Step 5: After the first step of discharge is completed, disconnect the discharge control system to obtain the tube blank to be processed after the first step of connection; Step 6: Keeping the position of the forming coil unchanged, rotate the obtained first step connecting tube circumferentially by 15-60° so that the undeformed area of the tube blank to be processed enters the working area of the coil for subsequent discharge connection process; Step 7: Repeat the operation of step 6 until a complete circumferential connection of the pipe fittings is achieved.