Metal plate coil-free electromagnetic pulse incremental forming device and method

Abstract

The invention discloses a coil-free electromagnetic pulse incremental forming device and method for a metal plate. The coil-free electromagnetic pulse incremental forming device comprises a machine tool, and a workbench is arranged at the top of the machine tool; the three-axis moving frame is installed on the top of the workbench, and an induction block is installed on the three-axis moving frame; a plate to be formed is clamped on the plate clamping table; the mold is mounted on the top surface of the workbench; the discharging assembly comprises a first discharging contact and a plurality of second discharging contacts; the power supply system is electrically connected with the first discharge contact or the second discharge contact; the control cabinet is electrically connected with an input module; the first discharge contact and the second discharge contact are respectively connected with the power supply system through wires, and a circuit breaker is installed on the wire between the second discharge contact and the power supply system. The layered and regional forming idea is adopted, complex parts can be formed by adopting a simple induction block structure shape, meanwhile, the strength of the induction block is improved, and the service life of the induction block is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of material plastic forming, and in particular to a coil-free electromagnetic pulse progressive forming device and method for a metal plate. Background Art

[0002] Electromagnetic pulse forming technology has shown significant advantages in material processing. This technology can effectively improve the forming limit of materials, and has the characteristics of fast forming speed, high forming accuracy, easy and precise control, and strong equipment versatility. In addition, the electromagnetic pulse forming process does not produce pollution, so it has been widely used in many fields such as machinery, electronics, automobile industry, light industry and chemical industry, instrumentation, aerospace, and weapons industry, showing broad application prospects.

[0003] The traditional electromagnetic pulse forming process is mainly used for high conductivity materials such as aluminum plates. Its working principle is as follows Figure 1 As shown: the power system is connected to the coil, and the sheet to be formed is placed between the coil and the die. When the pulse current passes through the coil, the generated electromagnetic field will induce current in the sheet to be formed, thereby forming an electromagnetic field. The mutual repulsion between the two electromagnetic fields causes the sheet to be formed to deform. However, this method is not effective for ferromagnetic materials with low magnetic permeability. Therefore, the traditional electromagnetic pulse forming process is mainly used for high conductivity materials such as aluminum and copper, while for the forming of low conductivity materials or non-metallic materials such as steel and titanium alloy, the existing coil structure cannot provide sufficient electromagnetic forming force.

[0004] In the design of the coil, the discharge coil is a key component for converting electrical energy into magnetic field energy. Its structure determines the magnetic field distribution of the workpiece and the forming result. However, during the electromagnetic pulse forming process, the coil will be affected by the electromagnetic reaction force and the thermal effect of the current, and it is easy to be damaged, requiring the coil to have high strength and durability. Especially in the multi-coil structure, the coil production cost is high, and it is difficult to ensure dimensional stability and the use requirements of multiple discharges, which greatly limits the application of electromagnetic pulse forming technology in mass production.

[0005] To overcome these limitations, the coilless electromagnetic pulse forming process proposed a solution to replace the traditional discharge coil with an induction plate, which effectively solved the problems of high cost and short life of the discharge coil. At the same time, low conductivity materials can be directly processed through the self-resistance electric heating forming of the sheet. According to the process requirements, the appropriate voltage and current are selected to heat the sheet. The generated resistance heat can locally soften the material, reduce the yield strength and reduce the forming force. However, when forming large, complex or repetitive workpieces, the coilless electromagnetic pulse forming process requires the design of large and complex molds and induction plates, which has a long production cycle, high cost, lack of flexibility, high technical difficulty and high cost.

[0006] The metal sheet incremental forming technology is mainly used to process large and complex sheet metal parts. By introducing the "layered manufacturing" concept in rapid prototyping technology, the overall forming of complex three-dimensional sheet metal parts is decomposed into a series of two-dimensional local plastic forming. Multiple small deformations accumulate to form large deformations, thereby reducing the forming difficulty and energy consumption. However, this process has the problems of low forming accuracy and poor surface quality.

[0007] Based on the above technical problems, the present invention provides a coil-free electromagnetic pulse incremental forming device and method for metal sheets. Summary of the invention

[0008] The purpose of the present invention is to provide a coil-free electromagnetic pulse incremental forming device and method for metal sheets to solve the problems existing in the prior art.

[0009] To achieve the above object, the present invention provides the following solution: The present invention provides a coil-free electromagnetic pulse incremental forming device for metal sheets, comprising:

[0010] A machine tool, wherein a workbench is arranged on the top of the machine tool;

[0011] A three-axis moving frame, the three-axis moving frame is installed on the top of the workbench, and a sensing block is installed on the three-axis moving frame;

[0012] A plate clamping platform, the plate clamping platform is installed on the top of the workbench, the plate clamping platform is located below the three-axis moving frame, a plate to be formed is clamped on the plate clamping platform, and the plate to be formed is arranged corresponding to the induction block;

[0013] A mold, wherein the mold is mounted on the top surface of the workbench, the mold is located below the plate to be formed and the mold is arranged corresponding to the induction block;

[0014] A discharge assembly, wherein the discharge assembly comprises a first discharge contact and a plurality of second discharge contacts, wherein the first discharge contact is arranged on the three-axis movable frame, and the plurality of second discharge contacts are arranged on the sheet clamping table, and the first discharge contact and the second discharge contact are arranged corresponding to the sheet to be formed;

[0015] a power supply system, wherein the power supply system is electrically connected to the first discharge contact or the second discharge contact;

[0016] A control cabinet, the three-axis mobile frame and the power supply system are both connected to the control cabinet by signal, and the control cabinet is electrically connected to an input module;

[0017] The first discharge contact, the second discharge contact and the power supply system are connected via wires respectively, and a circuit breaker is installed on the wire between the second discharge contact and the power supply system.

[0018] According to the coil-free electromagnetic pulse progressive forming device for metal sheets provided by the present invention, the three-axis movable frame includes an X-axis linear motor, a Y-axis linear motor and a Z-axis telescopic rod, fixed frames are fixedly connected on both sides of the workbench, the X-axis linear motor is fixed on the top of the two fixed frames, the Y-axis linear motor is installed on the X-axis linear motor, the Z-axis telescopic rod is installed on the Y-axis linear motor, and the induction block is arranged on the Z-axis telescopic rod.

[0019] According to the coil-free electromagnetic pulse incremental forming device for metal sheets provided by the present invention, a bus is fixedly connected to the top surface of the workbench, the bus is electrically connected to the power supply system, and the first discharge contact and a plurality of second discharge contacts are electrically connected to the bus through the wire.

[0020] According to the coil-free electromagnetic pulse incremental forming device for metal sheets provided by the present invention, the top end of the induction block is fixedly connected to an insulating block, the insulating block is fixedly connected to a buffer spring, and the buffer spring is fixed to the end of the Z-axis telescopic rod.

[0021] According to the coil-free electromagnetic pulse progressive forming device for metal sheet provided by the present invention, the first discharge contact includes a follower contact, the follower contact is fixed on the insulating block, the follower contact is in contact with the sheet to be formed, the follower contact is electrically connected to the bus through the wire, and the follower contact can deform following the sheet to be formed.

[0022] According to the coil-free electromagnetic pulse progressive forming device for metal sheets provided by the present invention, the second discharge contact includes a pneumatic contact, and the pneumatic contacts are arranged in a plurality of groups. The plurality of pneumatic contacts are circumferentially arranged on the sheet clamping table, and the pneumatic contacts are in contact and cooperation with the sheet to be formed, and the pneumatic contacts are connected to the bus through the wire.

[0023] According to the coil-free electromagnetic pulse progressive forming device for metal sheets provided by the present invention, a positioning fixture is installed on the top surface of the workbench, and the mold is detachably connected to the positioning fixture.

[0024] According to the coil-free electromagnetic pulse incremental forming device for metal sheets provided by the present invention, the power supply system includes a DC power supply, an energy storage capacitor, a voltage dividing resistor and a control switch, the DC power supply is used to charge the energy storage capacitor; the voltage dividing resistor is used to control the charging voltage of the energy storage capacitor; the energy storage capacitor is electrically connected to the bus.

[0025] A coil-free electromagnetic pulse incremental forming method for a metal sheet comprises the following steps:

[0026] S1, fix the mold on the top surface of the workbench, then clamp the sheet to be formed on the sheet clamping table, and clamp the induction block on the three-axis moving frame;

[0027] S2, the sheet shape is imported into the control cabinet through the input module, and the control cabinet presets the processing route;

[0028] S3, determining whether the power supply system is connected to the first discharge contact or the second discharge contact, and implementing S4 and S6 when the power supply system is connected to the first discharge contact, and implementing S5-S6 when the power supply system is connected to the second discharge contact;

[0029] S4, the control cabinet controls the three-axis moving frame to drive the induction block to move to the preset position, the power supply system is charged, and when the charging voltage reaches the forming voltage, it is disconnected, the charging circuit is disconnected, the discharge circuit is connected, and the discharge is discharged through the first discharge contact. The instantaneous current generates a local current and a strong magnetic field on the sheet to be formed, and at the same time, an induced current and an induced electromagnetic field are generated on the induction block. Under the action of the magnetic field force, the sheet to be formed is formed, the position of the three-axis moving frame is readjusted, and the operation is repeated to realize the progressive forming of the sheet to be formed;

[0030] S5, the control cabinet controls the three-axis moving frame to drive the induction block to move to the preset position, the power supply system is charged, and when the charging voltage reaches the forming voltage, it is disconnected, the charging circuit is disconnected, the discharge circuit is connected, the circuit breaker on the second discharge contact corresponding to the processing position is closed, the second discharge contact is discharged, and the instantaneous current generates a local current and a strong magnetic field on the sheet to be formed, and at the same time, an induced current and an induced electromagnetic field are generated on the induction block. Under the action of the magnetic field force, the sheet to be formed is formed, the circuit breaker is opened, the position of the three-axis moving frame is readjusted, and the operation is repeated to realize the progressive forming of the sheet to be formed;

[0031] S6, remove the formed sheet and the mold, replace the mold and sheet, and proceed to the next processing.

[0032] The present invention discloses the following technical effects:

[0033] 1. The present invention combines coil-free electromagnetic pulse forming and incremental forming processes to directly and efficiently form large and complex parts made of low-conductivity materials.

[0034] 2. The present invention adopts the concept of layered and regional forming, and can complete the forming of complex parts with a simple sensor block structure shape, while improving the strength and life of the sensor block.

[0035] 3. The mold of the present invention is simple and easy to install and manufacture, thus reducing production costs; different workpieces can be processed by simply replacing different molds, so the device of the present invention has a wide range of applications.

[0036] 4. In the forming process, the present invention can control the energized area by opening and closing the circuit breaker, so as to realize local energization and avoid energizing the entire sheet to be formed every time forming, which greatly reduces energy loss and makes production more sustainable. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 This is the principle diagram of traditional electromagnetic pulse forming;

[0039] Figure 2 Schematic diagram of the coil-free electromagnetic pulse progressive forming device of the present invention Figure Ⅰ ;

[0040] Figure 3 It is a structural schematic diagram of the workbench of the present invention;

[0041] Figure 4 Schematic diagram of the coil-free electromagnetic pulse progressive forming device of the present invention Figure II .

[0042] Among them, 1. mold; 2. sheet material to be formed; 3. machine tool; 4. control cabinet; 5. power supply system; 6. workbench; 7. three-axis moving frame; 8. spring; 9. insulating block; 10. induction block; 11. pneumatic contact; 12. wire; 13. circuit breaker; 14. bus; 15. positioning fixture; 16. follow-up contact; 17. fixing frame. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Reference Figure 1-Figure 4 The present invention provides a coil-free electromagnetic pulse progressive forming device for metal sheets, comprising:

[0046] A machine tool 3, a workbench 6 is provided on the top of the machine tool 3;

[0047] A three-axis moving frame 7, which is installed on the top of the workbench 6, and a sensing block 10 is installed on the three-axis moving frame 7;

[0048] A plate clamping table, which is installed on the top of the workbench 6 and is located below the three-axis moving frame 7. The plate to be formed is clamped on the plate clamping table, and the plate to be formed is arranged corresponding to the induction block 10;

[0049] The mold 1 is installed on the top surface of the workbench 6, the mold 1 is located below the plate to be formed and the mold 1 is arranged corresponding to the induction block 10;

[0050] The discharge assembly includes a first discharge contact and a plurality of second discharge contacts. The first discharge contact is arranged on the three-axis moving frame 7, and the plurality of second discharge contacts are arranged on the plate clamping table. The first discharge contact and the second discharge contact are arranged corresponding to the plate to be formed;

[0051] A power supply system 5, the power supply system 5 is electrically connected to the first discharge contact or the second discharge contact;

[0052] The control cabinet 4, the three-axis mobile frame 7, and the power supply system 5 are all connected to the control cabinet 4 by signal, and the control cabinet 4 is electrically connected to the input module;

[0053] The first discharge contact, the second discharge contact and the power supply system 5 are connected via a wire 12 , respectively. A circuit breaker 13 is installed on the wire 12 between the second discharge contact and the power supply system 5 .

[0054] The mold 1 is a concave mold or a convex mold.

[0055] A further optimized solution is that the three-axis movable frame 7 includes an X-axis linear motor, a Y-axis linear motor and a Z-axis telescopic rod. Fixed frames 17 are fixedly connected on both sides of the workbench 6. The X-axis linear motor is fixed on the top of the two fixed frames 17, the Y-axis linear motor is installed on the X-axis linear motor, the Z-axis telescopic rod is installed on the Y-axis linear motor, and the induction block 10 is arranged on the Z-axis telescopic rod.

[0056] According to a further optimized solution, a bus 14 is fixedly connected to the top surface of the workbench 6 , the bus 14 is electrically connected to the power supply system 5 , and the first discharge contact and the plurality of second discharge contacts are electrically connected to the bus 14 through the wire 12 .

[0057] The three-axis movement is achieved by the X-axis linear motor, the Y-axis linear motor and the Z-axis telescopic rod, which is used to achieve the movement of the top sensing block 10. The flexibility of the device is improved by the cooperation of the X-axis linear motor, the Y-axis linear motor and the Z-axis telescopic rod.

[0058] According to a further optimized solution, the top of the sensing block 10 is fixedly connected to an insulating block 9, the insulating block 9 is fixedly connected to a buffer spring 8, and the buffer spring 8 is fixed to the end of the Z-axis telescopic rod.

[0059] The induction block 10 is made of a high conductivity material and is used to generate an induced current and an induced magnetic field and to generate a magnetic field force to deform the sheet to be formed; the insulating block 9 is an epoxy block made of epoxy resin and is connected to the induction block 10 and the Z-axis telescopic rod to isolate the induced current; the buffer spring 8 is used to reduce the vibration caused by the electromagnetic force and maintain the stability of the Z-axis telescopic rod.

[0060] A further optimized solution is that the first discharge contact includes a follower contact 16, which is fixed on the insulating block 9, and the follower contact 16 is in contact with the sheet to be formed. The follower contact 16 is electrically connected to the bus 14 through the wire 12, and the follower contact 16 can deform along with the sheet to be formed.

[0061] The materials of the conformal contact 16 include: conductive rubber, conductive sponge, conductive foam, and conductive paint.

[0062] According to a further optimization scheme, the second discharge contact includes a pneumatic contact 11. The pneumatic contact 11 is provided in several groups. Several pneumatic contacts 11 are circumferentially arranged on the sheet clamping table. The pneumatic contact 11 contacts and cooperates with the sheet to be formed. The pneumatic contact 11 is connected to the bus 14 through a wire 12.

[0063] In a further optimized solution, a positioning fixture 15 is installed on the top surface of the workbench 6, and the mold 1 is detachably connected to the positioning fixture 15. The positioning fixture 15 adopts a pneumatic fixture or an electric fixture, so that molds 1 of different sizes can be automatically clamped, thereby improving the application range of the device.

[0064] According to a further optimization scheme, the power supply system 5 includes a DC power supply, an energy storage capacitor, a voltage-dividing resistor and a control switch. The DC power supply is used to charge the energy storage capacitor; the voltage-dividing resistor is used to control the charging voltage of the energy storage capacitor; and the energy storage capacitor is electrically connected to the bus 14.

[0065] A coil-free electromagnetic pulse incremental forming method for a metal sheet comprises the following steps:

[0066] S1, fix the corresponding mold 1 on the top of the workbench 6 by the positioning fixture 15, then clamp the sheet to be formed on the sheet clamping table, use the pneumatic contact 11 to fix the sheet to be formed on the sheet clamping table, and clamp the induction block 10 on the insulating block 9 at the bottom of the Z-axis telescopic rod;

[0067] S2, the plate shape is imported into the control cabinet 4 through the input module, and the control cabinet 4 presets the processing route;

[0068] S3, determining whether the power supply system 5 is connected to the first discharge contact or the second discharge contact, and when the power supply system 5 is connected to the first discharge contact, implementing S4 and S6, and when the power supply system 5 is connected to the second discharge contact, implementing S5-S6;

[0069] S4, the control cabinet 4 controls the X-axis linear motor, the Y-axis linear motor and the Z-axis telescopic rod to move, driving the induction block 10 to move to the initial processing position, and after program retrieval, the coordinates of the induction block 10 and the pneumatic contact 11 are compared, and the corresponding circuit breaker 13 is closed, and a power-on circuit is formed between the bus 14, the wire 12, the circuit breaker 13, the pneumatic contact 11, and the sheet to be formed. The control cabinet 4 controls the DC power supply to be connected with the energy storage capacitor. When the charging voltage reaches the forming voltage, the charging circuit is disconnected; then the circuit breaker 13 of the pneumatic contact 11 at the corresponding position is opened, and the instantaneous current passes through the bus 14 and the pneumatic contact 11 to generate a local current and a strong magnetic field on the sheet to be formed, and at the same time, an induced current and an induced magnetic field are generated in the induction block 10, and the sheet to be formed is formed under the action of the magnetic field force, and the discharge switch is disconnected, and then the X-axis linear motor, the Y-axis linear motor and the Z-axis telescopic rod are used to move the device to the next processing position; this cycle is repeated until the sheet to be formed is completely formed, and the progressive forming of the sheet to be formed is realized;

[0070] S5, the control cabinet 4 controls the three-axis moving frame 7 to drive the induction block 10 to move to the preset position, the power supply system 5 charges, and when the charging voltage reaches the forming voltage, it is disconnected, the charging circuit is disconnected, the discharge circuit is connected, the circuit breaker 13 on the second discharge contact corresponding to the processing position is closed, the second discharge contact discharges, and the instantaneous current generates a local current and a strong magnetic field on the sheet to be formed. At the same time, an induced current and an induced electromagnetic field are generated on the induction block 10, and the sheet to be formed is formed under the action of the magnetic field force. The circuit breaker 13 is opened, and the position of the three-axis moving frame 7 is readjusted. Repeat the operation to realize the progressive forming of the sheet to be formed;

[0071] S6, removing the formed sheet and the mold 1, replacing the mold 1 and the sheet, and performing the next processing.

[0072] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply 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 understood as a limitation on the present invention.

[0073] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A coil-free electromagnetic pulse progressive forming device for metal sheets, characterized in that: include: A machine tool (3), wherein a workbench (6) is arranged on the top of the machine tool (3); A three-axis moving frame (7), the three-axis moving frame (7) being mounted on the top of the workbench (6), and a sensing block (10) being mounted on the three-axis moving frame (7); A plate clamping platform, the plate clamping platform is installed on the top of the workbench (6), the plate clamping platform is located below the three-axis moving frame (7), a plate to be formed is clamped on the plate clamping platform, and the plate to be formed is arranged corresponding to the induction block (10); A mold (1), wherein the mold (1) is mounted on the top surface of the workbench (6), the mold (1) is located below the plate to be formed and the mold (1) is arranged corresponding to the induction block (10); A discharge assembly, the discharge assembly comprising a first discharge contact and a plurality of second discharge contacts, the first discharge contact being arranged on the three-axis movable frame (7), the plurality of second discharge contacts being arranged on the sheet material clamping table, the first discharge contact and the second discharge contact being arranged corresponding to the sheet material to be formed; A power supply system (5), the power supply system (5) being electrically connected to the first discharge contact or the second discharge contact; The control cabinet (4), the three-axis mobile frame (7), and the power supply system (5) are all signal-connected to the control cabinet (4), and the control cabinet (4) is electrically connected to an input module; The first discharge contact, the second discharge contact and the power supply system (5) are respectively connected via a wire (12), and a circuit breaker (13) is installed on the wire (12) between the second discharge contact and the power supply system (5).

2. The coil-free electromagnetic pulse incremental forming device for metal sheet according to claim 1, characterized in that: The three-axis moving frame (7) comprises an X-axis linear motor, a Y-axis linear motor and a Z-axis telescopic rod. The two sides of the workbench (6) are fixedly connected with fixed frames (17). The X-axis linear motor is fixed to the top of the two fixed frames (17). The Y-axis linear motor is installed on the X-axis linear motor. The Z-axis telescopic rod is installed on the Y-axis linear motor. The induction block (10) is arranged on the Z-axis telescopic rod.

3. The coil-free electromagnetic pulse incremental forming device for metal sheet according to claim 2, characterized in that: A busbar (14) is fixedly connected to the top surface of the workbench (6), the busbar (14) is electrically connected to the power supply system (5), and the first discharge contact and a plurality of second discharge contacts are electrically connected to the busbar (14) via the wire (12).

4. The coil-free electromagnetic pulse incremental forming device for metal sheet according to claim 3, characterized in that: The top end of the induction block (10) is fixedly connected to an insulating block (9), the insulating block (9) is fixedly connected to a buffer spring (8), and the buffer spring (8) is fixed to the end of the Z-axis telescopic rod.

5. The coil-free electromagnetic pulse incremental forming device for metal sheet according to claim 4, characterized in that: The first discharge contact comprises a follower contact (16), the follower contact (16) is fixed on the insulating block (9), the follower contact (16) is in contact with the sheet to be formed, the follower contact (16) is electrically connected to the busbar (14) via the wire (12), and the follower contact (16) can deform along with the sheet to be formed.

6. The coil-free electromagnetic pulse incremental forming device for metal sheet according to claim 4, characterized in that: The second discharge contact comprises a pneumatic contact (11), the pneumatic contact (11) is provided in a plurality of groups, the plurality of pneumatic contacts (11) are circumferentially arranged on the sheet clamping platform, the pneumatic contact (11) contacts and cooperates with the sheet to be formed, and the pneumatic contact (11) and the busbar (14) are connected via the wire (12).

7. The coil-free electromagnetic pulse incremental forming device for metal sheet according to claim 1, characterized in that: A positioning fixture (15) is installed on the top surface of the workbench (6), and the mold (1) is detachably connected to the positioning fixture (15).

8. The coil-free electromagnetic pulse incremental forming device for metal sheet according to claim 3, characterized in that: The power supply system (5) comprises a direct current power supply, an energy storage capacitor, a voltage dividing resistor and a control switch, wherein the direct current power supply is used to charge the energy storage capacitor; the voltage dividing resistor is used to control the charging voltage of the energy storage capacitor; and the energy storage capacitor is electrically connected to the bus (14).

9. A method for incrementally forming a metal sheet without a coil by electromagnetic pulse, based on the device for incrementally forming a metal sheet without a coil by electromagnetic pulse according to any one of claims 1 to 8, characterized in that: The steps include: S1, fix the mold (1) on the top surface of the workbench (6), then clamp the sheet to be formed on the sheet clamping table, and clamp the induction block (10) on the three-axis moving frame (7); S2, importing the plate shape into the control cabinet (4) through the input module, and the control cabinet (4) presets the processing route; S3, determining whether the power supply system (5) is connected to the first discharge contact or the second discharge contact, and implementing S4 and S6 when the power supply system (5) is connected to the first discharge contact, and implementing S5-S6 when the power supply system (5) is connected to the second discharge contact; S4, the control cabinet (4) controls the three-axis moving frame (7) to drive the induction block (10) to move to a preset position, the power supply system (5) charges, and when the charging voltage reaches the forming voltage, it is disconnected, the charging circuit is disconnected, the discharge circuit is connected, and the discharge is discharged through the first discharge contact, and the instantaneous current generates a local current and a strong magnetic field on the sheet to be formed, and at the same time, an induced current and an induced electromagnetic field are generated on the induction block (10), and the sheet to be formed is formed under the action of the magnetic field force, and the position of the three-axis moving frame (7) is readjusted, and the operation is repeated to achieve progressive forming of the sheet to be formed; S5, the control cabinet (4) controls the three-axis moving frame (7) to drive the induction block (10) to move to a preset position, the power supply system (5) charges, and when the charging voltage reaches the forming voltage, it is disconnected, the charging circuit is disconnected, the discharge circuit is connected, the circuit breaker (13) on the second discharge contact corresponding to the processing position is closed, the second discharge contact discharges, the instantaneous current generates a local current and a strong magnetic field on the sheet to be formed, and at the same time, an induced current and an induced electromagnetic field are generated on the induction block (10), the sheet to be formed is formed under the action of the magnetic field force, the circuit breaker (13) is opened, the position of the three-axis moving frame (7) is readjusted, and the operation is repeated to achieve progressive forming of the sheet to be formed; S6, removing the formed plate and the mold (1), replacing the mold (1) and the plate, and performing the next processing.

Images