Metal foil electromagnetic flexible micro-forming device and method

Abstract

The application discloses a metal foil electromagnetic flexible micro-forming device and method based on magnetic force. A cylinder drives a clamp to press a concave die, the concave die and an electric heating plate press a non-magnetic metal foil, the electric heating plate heats the non-magnetic metal foil, an electric telescopic rod drives an upper electromagnet to move down to a set position, the upper electromagnet is electrified to generate magnetic attraction force on the iron powder below the upper electromagnet, the iron powder moves upward to impact the non-magnetic metal foil, the non-magnetic metal foil is drawn upward to a forming groove, the upper electromagnet is de-energized, a lower electromagnet is electrified, the iron powder falls back into an iron powder container, and the lower electromagnet is de-energized. The non-magnetic metal foil is repeatedly micro-formed in the forming groove. The concave die is arranged above and the iron powder is arranged below, which is beneficial to demolding. The magnetic force of the iron powder on the electromagnet is used to make the metal foil adhere to the surface of the concave die, so that the metal foil is formed into a micro part according to the shape of the forming groove, and the forming process is not affected by the shape of the micro part.

Description

Technical Field

[0001] This invention relates to the field of micro-part forming technology, and more specifically to a metal foil micro-forming device and method based on magnetic force. Background Technology

[0002] With the rapid development of microelectronics and microelectromechanical systems (MEMS), the demand for micro-components in micro-products is becoming increasingly prominent, and microforming technology has become one of the most advanced manufacturing technologies today. Traditional processing methods for micro-parts suffer from low forming efficiency and low forming accuracy due to size effects. Therefore, a series of advanced new flexible forming technologies have emerged, such as electromagnetic forming, cavitation forming, and laser forming. However, current new flexible forming technologies suffer from problems such as easy foil breakage, insufficient foil deformation capacity, and low energy utilization efficiency. For example, Chinese Patent Publication No. CN115138761A discloses a pulsed thermal cavitation jet microforming device and forming method. Liquid flows from the cavity into the nozzle, and the impact force of the cavitation jet plastically shapes the foil. It employs a conventional clamping system, heating forming system, three-dimensional moving system, liquid circulation system, and control unit. However, this method suffers from low cavitation efficiency, slow forming speed, low energy utilization, and insufficient forming effect on the foil. Chinese Patent Publication No. CN115971321A discloses an electromagnetic forming device and forming method. It utilizes the magnetic field generated by the induced eddy current in a pulsed magnetic field and the opposite magnetic force of the pulsed magnetic field to deform the metal sheet towards the mold. However, this method is limited by the geometry of the metal sheet itself, and it is difficult to form complex shapes and small flow channels or apertures. The forming speed of this method is relatively slow, which is difficult to meet the production conditions of high efficiency and high capacity. Summary of the Invention

[0003] To address the shortcomings of the prior art, this invention proposes an electromagnetic flexible microforming device and method that uses magnetic force to attract iron powder to impact, extrude, and deepen non-magnetic metal foil. This device has no restrictions on the shape of the micro-parts, high cavitation efficiency, and fast forming speed.

[0004] To achieve the above objectives, the technical solution of the electromagnetic flexible microforming device for metal foil of the present invention is as follows: A mold frame is located directly above the base, and a die is located directly above the mold frame. Guide pillars of the die move vertically. Two vertical guide pillars are fixedly connected to the base at their bottoms, pass through the mold frame with a gap in the middle, and are fitted with the die with a gap at their tops. A stepped groove with an open top is opened at the center of the top surface of the mold frame. A lower electromagnet rigidly connected to the mold frame is placed inside the lower section of the stepped groove, and an iron powder container is placed inside the upper section of the stepped groove. The iron powder is located directly above the lower electromagnet, and above the iron powder is a non-magnetic metal foil horizontally placed on the upper surface of the mold frame. A heating plate is fixedly embedded in the middle part of the bottom surface of the die. The bottom surface of the hot plate is flush with the bottom surface of the die. A forming groove is formed on the bottom surface of the die. A through hole with the same structure as the forming groove is formed on the heating plate directly below the forming groove. Multiple pressure sensors are arranged at intervals inside the forming groove. An upper electromagnet is provided directly above the die. A die opening that mates with the upper electromagnet is provided in the center of the upper part of the die. The upper electromagnet can extend into the die opening when it moves downward. The top of the upper electromagnet is fixedly connected to a horizontally set upper electromagnet fixing plate. An electric telescopic rod drives the upper electromagnet fixing plate to move vertically. An upper electromagnet position detection sensor is installed on the side wall of the upper electromagnet to detect the vertical position of the upper electromagnet. A clamp is provided next to the die. A cylinder drives the clamp to release or press down the die.

[0005] Furthermore, the cylinder and the electric telescopic rod are connected to the control console via their respective control lines. The control console is connected to the pressure sensor and the upper electromagnet position detection sensor via signal lines. The control console controls the heating plate to turn on or off the power supply, and controls the coils on the upper and lower electromagnets to turn on or off the power supply.

[0006] The microforming method of the electromagnetic flexible microforming device for metal foil described in this invention includes the following steps:

[0007] Step A: The cylinder drives the clamp to press down the die until the die and the heating plate press the non-magnetic metal foil together, and then the cylinder stops working;

[0008] Step B: The heating plate heats the non-magnetic metal foil, and the electric telescopic rod drives the upper electromagnet to move down to the set position, at which point the electric telescopic rod stops.

[0009] Step C: When the upper electromagnet is energized, it generates a magnetic attraction force on the iron powder below it. The iron powder moves upward and impacts the non-magnetic metal foil, which is then pulled deeper into the forming groove directly above.

[0010] Step D: The upper electromagnet is de-energized, the lower electromagnet is energized, the iron powder falls back into the iron powder container, and the lower electromagnet is de-energized.

[0011] Step E: Repeat steps CD to achieve micro-forming of non-magnetic metal foil in the forming groove;

[0012] Step F: The heating plate stops heating, the clamp releases the die, the electric telescopic rod resets, the die is removed, and the formed non-magnetic metal foil is taken out.

[0013] Furthermore, multiple pressure sensors continuously detect the impact pressure of iron powder impacting the non-magnetic metal foil. When all pressure sensors detect that the pressure has reached the set value, the upper electromagnet is kept energized for a set period of time.

[0014] Compared with existing forming technologies, the beneficial effects of the present invention are as follows:

[0015] (1) This invention utilizes the magnetic force of iron powder on an electromagnet to bond metal foil to the surface of a die, thereby shaping micro parts according to the forming groove cavity shape of the die. Traditional punches have high processing costs, significant environmental pollution, and low economic benefits. Using iron powder to replace traditional punches achieves flexible forming, resulting in low processing costs, no influence from the shape of the micro parts, and good environmental protection.

[0016] (2) Compared with other processes that use punches to extrude metal powder to form plates, the present invention uses electromagnetic force instead of traditional mechanical force, which greatly saves the space occupied by the equipment. Furthermore, the electromagnetic force acts directly on the iron powder, which reduces the energy transfer loss compared with the process of extruding metal powder with punches to form plates.

[0017] (3) The die arrangement in the microforming device of the present invention is that the die is on top and the iron powder is below. When the die is removed, it is easy to demold under the action of the gravity of the metal foil. It is also beneficial that the iron powder can fall back into the iron powder container not only by the magnetic force of the lower electromagnet, but also by the action of gravity. Attached Figure Description

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0019] Figure 1 This is a schematic diagram of the overall structure of an electromagnetic flexible microforming device for metal foil according to the present invention.

[0020] Figure 2 for Figure 1 Top view of the main components structure;

[0021] Figure 3 for Figure 1 Enlarged three-dimensional structure view of the intermediate mold frame;

[0022] Figure 4 for Figure 1 Enlarged 3D structural diagram of the iron powder container;

[0023] Figure 5 for Figure 1 Enlarged bottom view of components such as the central die and heating plate.

[0024] In the diagram: 1. Base; 2. Electric telescopic rod; 3. First guide post; 4. Mold frame; 4-1. Stepped groove; 4-2. Upper square groove; 4-3. Lower circular groove; 5. Non-magnetic metal foil; 6. Heating plate; 7. Die; 7-1. Forming groove; 7-2. Die opening; 8. Upper electromagnet fixing plate; 9. Upper electromagnet; 10. Upper electromagnet position detection sensor; 11. Pressure sensor; 12. Fixture; 13. Iron powder container; 14. Iron powder; 15. Lower electromagnet; 16. Second guide post; 17. Third guide post; 18. Fixture fixing plate; 19. Rotating shaft; 20. Roller; 21. Cylinder output rod; 22. Cylinder; 23. Control console. Detailed Implementation

[0025] like Figure 1 The electromagnetic flexible microforming device for metal foil shown includes a forming system, a clamping system, and a detection system. The forming system includes a base 1, a first guide post 3, a second guide post 16, a die 7, a mold frame 4, an upper electromagnet 9, a lower electromagnet 15, a non-magnetic metal foil 5, an iron powder container 13, iron powder 14, an electric telescopic rod 2, an upper electromagnet fixing plate 8, and a third guide post 17. The clamping system includes a cylinder 22, a cylinder output rod 21, a clamp fixing plate 18, a clamp 12, and a clamp rotation shaft 19. The detection system includes an upper electromagnet position sensor 10 and a pressure sensor 11. The die 7, mold frame 4, base 1, clamp 12, and metal foil 5 are all made of non-magnetic metal materials.

[0026] A base 1, made of non-magnetic metal, is horizontally arranged. Directly above the base 1 is a mold frame 4, and directly above the mold frame 4 is a die 7. Two blind holes are formed on the base 1, through which the bottoms of the vertical first guide post 3 and second guide post 16 extend and are vertically fixed to the base 1. Two blind holes are formed on the die 7, through which the tops of the first guide post 3 and second guide post 16 extend, with a clearance fit between the tops and the blind holes. The die 7 can move vertically along the first guide post 3 and second guide post 16. Two through holes are formed on the mold frame 4, through which the first guide post 3 and second guide post 16 pass with a clearance. The mold frame 4 can slide up and down along the first guide post 3 and second guide post 16.

[0027] A stepped groove 4-1 is formed at the center of the top surface of the mold frame 4. The stepped groove 4-1 is located between the first guide post 3 and the second guide post 16, and the top of the stepped groove 4-1 is open. Figure 3 As shown, the upper section of the stepped groove 4-1 is a square groove 4-2, and an iron powder container 13 is placed inside the upper square groove 4-2, as shown. Figure 4As shown. The lower section of the stepped groove 4-1 is a circular groove 4-3. The positions of the first guide post 3 and the second guide post 16 are symmetrically arranged relative to the lower circular groove 4-3. A lower electromagnet 15 is placed inside the lower circular groove 4-3. The lower electromagnet 15 is placed on the bottom surface of the lower circular groove 4-3 and rigidly fixed to the mold frame 4. A coil is wound on the lower electromagnet 15. The iron powder container 13 is directly above the lower electromagnet 15. One side wall of the upper square groove 4-2 penetrates the side wall of the mold frame 4, forming a square channel communicating with the outside. This allows the iron powder container 13 to slide into the upper square groove 4-2 through the square channel, so that the iron powder container 13 is placed inside the mold frame 4, and the upper surface of the iron powder container 13 is flush with the upper surface of the mold frame 4.

[0028] The iron powder container 13 is made of non-magnetic material and contains an appropriate amount of iron powder 14, which is located directly above the lower electromagnet 15. The size of the iron powder container 13 is the same as the size of the upper square slot 4-2 on the mold frame 4, so that the iron powder container 13 matches the upper square slot 4-2 and is placed exactly in the upper square slot 4-2. Directly above the iron powder 14 is a non-magnetic metal foil 5, which is placed horizontally on the upper surface of the mold frame 4.

[0029] Above the non-magnetic metal foil 5 is the die 7, which is made of non-magnetic metal. For example... Figure 5 As shown, a heating plate 6 is fixedly embedded in the middle part of the bottom surface of the die 7, directly above the non-magnetic metal foil 5. The heating plate 6 is embedded in the bottom of the die 7, and its bottom surface is flush with the bottom surface of the die 7. A forming groove 7-1 is formed on the bottom surface of the die 7, and a through hole with the same structure as the forming groove 7-1 is formed on the heating plate 6 directly below the forming groove 7-1, so that the forming groove 7-1 communicates with the non-magnetic metal foil 5 directly below the heating plate 6. The forming groove 7-1 faces downwards and is directly opposite the non-magnetic metal foil 5 without being blocked by the heating plate 6.

[0030] A pressure sensor 11 is arranged inside the forming groove 7-1. Multiple pressure sensors 11 are arranged at intervals along the continuous length of the forming groove 7-1. Each pressure sensor 11 faces the non-magnetic metal foil 5 below it.

[0031] When the die 7 moves downward along the first guide post 3 and the second guide post 16, it will press the non-magnetic metal foil 5.

[0032] An upper electromagnet 9 is located directly above the die 7, and a coil is wound around the upper electromagnet 9. A die opening 7-2, which mates with the upper electromagnet 9, is located in the center of the upper part of the die 7. When the upper electromagnet 9 moves downwards, it can extend into the die opening 7-2. Figure 2The opening 7-2 of the concave mold is not connected to the forming groove 7-1 below. The top of the upper electromagnet 9 is fixedly connected to the upper electromagnet fixing plate 8. The upper electromagnet fixing plate 8 is horizontally arranged, and a vertically arranged electric telescopic rod 2 and a third guide post 17 are connected between it and the base 1. When the electric telescopic rod 2 is working, it can drive the upper electromagnet fixing plate 8 and the upper electromagnet 9 to move vertically, and the upper electromagnet fixing plate 8 slides up and down along the third guide post 17. The electric telescopic rod 2 and the third guide post 17 are distributed on both sides of the upper electromagnet 9 and are symmetrical with respect to the center of the upper electromagnet 9.

[0033] An upper electromagnet position detection sensor 10 is installed on the side wall of the upper electromagnet 9 to detect the position reached by the upper electromagnet 9 when it moves vertically.

[0034] A clamp 12 is provided next to the die 7. The clamp 12 is driven by the cylinder 22 to press the die 7 downward.

[0035] The cylinder 22 is horizontally arranged and rigidly fixed, extending a distance above the base 1. The clamp 12 is L-shaped, with its middle bend connected to the clamp fixing plate 18 via a rotating shaft 19. The clamp fixing plate 18 is fixed, while the rotating shaft 19 is horizontally arranged, allowing the clamp 12 to rotate around it on a vertical plane. The output rod 21 of the cylinder 22 is connected to the roller 20. A groove is formed on the vertical section of the clamp 12 to mate with the roller 20, which slides within the groove. The end of the horizontal section of the clamp 12 is located above the die 7. When the cylinder 22 is in operation, its output rod 21 extends or retracts, causing the roller 20 to move back and forth in the groove, rotating the clamp 12 in both directions. The clamp 12 releases or presses down on the die 7, clamping the non-magnetic metal foil 5 between the die 7 and the mold frame 4. The heating plate 6 is in close contact with the non-magnetic metal foil 5.

[0036] Cylinder 22 and electric telescopic rod 2 are connected to control console 23 via their respective control lines. Control console 23 controls cylinder 22 to operate, thereby causing clamp 12 to loosen or tighten die 7. Control console 23 controls electric telescopic rod 2 to operate, controlling its extension and retraction stroke. Electric telescopic rod 2 drives upper electromagnet fixing plate 8 and upper electromagnet 9 to move up or down, approaching or moving away from iron powder 14 and lower electromagnet 15 below them. Control console 23 is connected to pressure sensor 11 and upper electromagnet position detection sensor 10 via signal lines. Pressure sensor 11 transmits the detected pressure signal to control console 23. Upper electromagnet position detection sensor 10 transmits the vertical position signal of the upper electromagnet 9 it detects to control console 23. When the upper electromagnet 9 reaches the predetermined position, it sends a signal to control console 23, and control console 23 controls electric telescopic rod 2 to stop moving, thereby stopping upper electromagnet 9 from moving downward. The control console 23 controls the heating plate 6 to turn on or off the power. When the heating plate 6 is powered on, it heats the non-magnetic metal foil 5 that is in close contact with it, making it easier to form. The control console 23 controls the coils on the upper electromagnet 9 and the lower electromagnet 15 to turn on or off the power, generating or releasing magnetic force on the iron powder 14.

[0037] When the microforming device of the present invention is working, in the initial position, the electric telescopic rod 2 is extended upward to the highest position, the upper electromagnet fixing plate 8 and the upper electromagnet 9 are in the highest position, and the clamp 12 is in the released state. An appropriate amount of iron powder 14 is placed into the iron powder container 13, and the iron powder container 13 is placed in the mold frame 4 through the channel of the upper square groove 4-2.

[0038] The control panel 23 starts the cylinder 22 to work. The cylinder 22 drives the clamp 12 to press down the die 7 until it is pressed down to the set distance. At this time, the die 7 presses the non-magnetic metal foil 5 tightly. At this time, the heating plate 6 is also pressed on the non-magnetic metal foil 5, and the cylinder 22 stops working.

[0039] Then, the heating plate 6 is powered on to heat the non-magnetic metal foil 5, causing the non-magnetic metal foil 5 to take shape within a set temperature range. This temperature range is determined by the material properties, shape, and thickness of the non-magnetic metal foil 5.

[0040] The control console 23 controls the electric telescopic rod 2 to retract downwards, causing the upper electromagnet 9 to move downwards. The distance the upper electromagnet 9 moves downwards determines the magnitude of its magnetic attraction to the iron powder 14. The magnitude of the moving distance depends on the material properties of the non-magnetic metal foil 5. If the non-magnetic metal foil 5 is difficult to form, the upper electromagnet 9 moves to a lower position to increase the magnetic force; conversely, it moves to a higher position. When the upper electromagnet position detection sensor detects that the upper electromagnet 9 has moved to the set position, the electric telescopic rod 2 stops working.

[0041] Subsequently, control console 23 energizes the upper electromagnet 9, generating a strong magnetic attraction to the iron powder 14 below it. Under the influence of this magnetic attraction, the iron powder 14 moves upward, impacting the non-magnetic metal foil 5, thus drawing the non-magnetic metal foil 5 deeper into the forming groove 7-1 directly above. After the non-magnetic metal foil 5 maintains this drawing and forming process for a certain period, control console 23 de-energizes the upper electromagnet 9 and simultaneously energizes the lower electromagnet 15. The lower electromagnet 15 generates a strong magnetic attraction to the iron powder 14 above it, causing the iron powder 14 to fall back into the iron powder container 13. Once the iron powder 14 has fallen back into the iron powder container 13, the lower electromagnet 15 is de-energized. Then, the upper electromagnet 9 is energized again, and this process of impacting the non-magnetic metal foil 5 is repeated, achieving the micro-forming of the non-magnetic metal foil 5 within the forming groove 7-1.

[0042] During the repeated impacts on the non-magnetic metal foil 5, the non-magnetic metal foil 5 exhibits a springback phenomenon. After a period of springback, the control console 53 energizes the upper electromagnet 9 and de-energizes the lower electromagnet 15. The iron powder 14 then performs a second forming and deep drawing on the non-magnetic metal foil 5. This forming process is repeated multiple times to ensure sufficient springback time for the non-magnetic metal foil 5, guaranteeing its forming quality. During this process, the pressure sensor 11 continuously detects the impact force of the iron powder 14 on the non-magnetic metal foil 5 and transmits this impact force to the control console 23. The control console 23 then obtains the stress conditions at various points on the non-magnetic metal foil 5 during forming.

[0043] When the forming groove 7-1 is a continuous curved groove, it can be applied in the manufacture of metal bipolar plates for fuel cells. The shape of the forming groove 7-1 is not limited to this shape. When the forming groove 7-1 is a curved groove, a pressure sensor 11 is arranged at the center of the straight section of the curved groove and at the center of the bend. Because the difficulty of forming at the straight section and the bend of the curved groove is different, this arrangement is used to detect the forming quality of the non-magnetic metal foil 5 at different positions.

[0044] When all pressure sensors 11 detect the pressure from the non-magnetic metal foil 5 and the pressure of the non-magnetic metal foil 5 reaches a set pressure value, it indicates that the non-magnetic metal foil 5 has completed the micro-forming process. The control console 23 sends a signal to de-energize the lower electromagnet 15, while keeping the upper electromagnet 9 energized for a set period of time. This allows the non-magnetic metal foil 5 to further and accurately replicate the contour of the forming groove 7-1 on the die 7, ensuring forming quality. Then, the control console 23 energizes the lower electromagnet 15 while simultaneously de-energizing the upper electromagnet 7, causing the iron powder 14 to fall back into the iron powder container 13. The control console 23 then de-energizes the lower electromagnet 15.

[0045] Control console 23 cuts off the power to heating plate 6, stopping the heating of non-magnetic metal foil 5. Control console 23 then moves cylinder 22, causing clamp 12 to release die 7. Control console 23 then moves electric telescopic rod 2, causing upper electromagnet 9 to move upward and reset. Upper electromagnet 9 moves away from die opening 7-2 of die 7. When upper electromagnet position detection sensor 10 detects that upper electromagnet 9 has returned to its initial position, control console 23 stops the electric telescopic rod, and die 7 can then be removed.

[0046] Since the iron powder 14 is formed by impacting the non-magnetic metal foil 5 vertically upwards, and the entrance direction of the forming groove 7-1 of the die 7 is vertically downwards, it is beneficial for demolding. When the groove 7 is removed, the non-magnetic metal foil 5 falls naturally under the action of gravity, and the foil 5 can be removed.

[0047] Finally, remove the iron powder container 13. At this point, the iron powder 14 has already been magnetized and will scatter without the constraint of magnetic force. Therefore, the iron powder 14 should be demagnetized before the next use.

[0048] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A flexible electromagnetic microforming device for metal foil, comprising a horizontally arranged base (1), characterized in that: The base (1) is directly above the mold frame (4), and the mold frame (4) is directly above the cavity mold (7). The cavity mold (7) can move vertically along the guide post. The bottom of the two vertical guide posts is fixedly connected to the base (1), passes through the mold frame (4) with a gap in the middle, and fits with the cavity mold (7) with a gap at the top. The top surface of the mold frame (4) has a stepped groove (4-1) with an open top. The lower section of the stepped groove (4-1) contains a lower electromagnet (15) that is rigidly connected to the mold frame (4). The upper section of the stepped groove (4-1) contains an iron powder container (13). The iron powder container (13) contains iron powder (14). The iron powder (14) is located directly above the lower electromagnet (15). Directly above the iron powder (14) is a non-magnetic metal foil (5) placed horizontally on the upper surface of the mold frame (4). A heating plate (6) is fixedly embedded in the middle part of the bottom surface of the die (7). The bottom surface of the heating plate (6) is flush with the bottom surface of the die (7). A forming groove (7-1) is opened on the bottom surface of the die (7). A through hole with the same structure as the forming groove (7-1) is opened on the heating plate (6) directly below the forming groove (7-1). Multiple pressure sensors (11) are arranged at intervals inside the forming groove (7-1). An upper electromagnet (9) is provided directly above the die (7). A die opening (7-2) that cooperates with the upper electromagnet (9) is opened in the middle of the upper part of the die (7). The upper electromagnet (9) can extend into the die opening (7-2) when it moves downward. The top of the upper electromagnet (9) is fixedly connected to the horizontally set upper electromagnet fixing plate (8). The electric telescopic rod (2) drives the upper electromagnet fixing plate (8) to move vertically. The upper electromagnet (9) is equipped with an upper electromagnet position detection sensor (10) to detect the vertical position of the upper electromagnet (9). A clamp (12) is provided next to the die (7). The cylinder (22) drives the clamp (12) to release or press down the die (7).

2. The electromagnetic flexible microforming device for metal foil according to claim 1, characterized in that: The cylinder (22) and the electric telescopic rod (2) are connected to the control console (23) via their respective control lines. The control console (23) is connected to the pressure sensor (11) and the upper electromagnet position detection sensor (10) via signal lines. The control console (23) controls the heating plate (6) to turn on or off the power supply. The control console (23) controls the coils on the upper electromagnet (9) and the lower electromagnet (15) to turn on or off the power supply.

3. The electromagnetic flexible microforming device for metal foil according to claim 1 or 2, characterized in that: The cylinder (22) is arranged horizontally, and the clamp (12) is L-shaped. The middle bend of the clamp (12) is connected to the fixed clamp fixing plate (18) through the rotating shaft (19). The clamp (12) rotates around the rotating shaft (19) on the vertical plane. The output rod (21) of the cylinder (22) is connected to the roller (20). The vertical section of the clamp (12) has a sliding groove that cooperates with the roller (20). The roller (20) slides in the sliding groove. The end of the horizontal section of the clamp (12) is located above the die (7). The output rod (21) of the cylinder (22) extends or retracts. The roller (20) moves back and forth in the sliding groove, driving the clamp (12) to rotate in both directions. The clamp (12) releases or presses down on the die (7).

4. The electromagnetic flexible microforming device for metal foil according to claim 1, characterized in that: The upper section of the stepped groove (4-1) is a square groove (4-2). One side wall of the upper square groove (4-2) penetrates the side wall of the mold frame (4), forming a square channel that communicates with the outside. The iron powder container (13) can enter the upper square groove (4-2) through this square channel. The upper surface of the iron powder container (13) is flush with the upper surface of the mold frame (4).

5. The electromagnetic flexible microforming device for metal foil according to claim 1, characterized in that: The upper electromagnet fixing plate (8) is connected to the base (1) by a vertically arranged electric telescopic rod (2) and a third guide post (17). The upper electromagnet fixing plate (8) can slide up and down along the third guide post (17). The electric telescopic rod (2) and the third guide post (17) are distributed on both sides of the upper electromagnet (9).

6. A microforming method for a metal foil electromagnetic flexible microforming device as described in claim 1, characterized in that: Includes the following steps: Step A: The cylinder (22) drives the clamp (12) to press down the die (7) until the die (7) and the heating plate (6) press the non-magnetic metal foil (5) together, and the cylinder (22) stops working; Step B: The electric heating plate (6) heats the non-magnetic metal foil (5), and the electric telescopic rod (2) drives the upper electromagnet (9) to move down to the set position, and the electric telescopic rod (2) stops working; Step C: When the upper electromagnet (9) is energized, it generates a magnetic attraction force on the iron powder (14) below it. The iron powder (14) moves upward and impacts the non-magnetic metal foil (5). The non-magnetic metal foil (5) is pulled deeper into the forming groove (7-1) directly above. Step D: The upper electromagnet (9) is de-energized, the lower electromagnet (15) is energized, the iron powder (14) falls back into the iron powder container (13), and the lower electromagnet (15) is de-energized; Step E: Repeat steps CD to achieve microforming of the non-magnetic metal foil (5) in the forming groove (7-1); Step F: The heating plate (6) stops heating, the clamp (12) releases the die (7), the electric telescopic rod (2) resets, the die (7) is removed, and the non-magnetic metal foil (5) after forming is taken out.

7. The microforming method according to claim 6, characterized in that: During step C, multiple pressure sensors (11) continuously detect the impact pressure of iron powder (14) impacting the non-magnetic metal foil (5). When all pressure sensors (11) detect that the pressure has reached the set value, the upper electromagnet (9) is kept energized for a period of time.

8. The microforming method according to claim 6, characterized in that: After step F, take out the iron powder container (3) and demagnetize the iron powder (14).

9. The microforming method according to claim 6, characterized in that: In step A, when the upper electromagnet position detection sensor (10) detects that the upper electromagnet (9) has moved down to the set position, the electric telescopic rod (2) stops working.

10. The microforming method according to claim 6, characterized in that: In step B, the distance the upper electromagnet (9) moves down depends on the material properties of the non-magnetic metal foil (5). If the non-magnetic metal foil (5) is not easy to form, the upper electromagnet (9) moves to a lower position to increase the magnetic force, and vice versa.

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