A liquid metal electrode rotating magnetic field control device

Abstract

The present invention provides a device for controlling the shape of a liquid metal electrode using a rotating magnetic field, comprising a control system, a magnetic control platform, and a liquid injection system. The liquid injection system includes a high-precision liquid metal supply device, a liquid metal storage cylinder, and a liquid metal supply capillary. The magnetic control platform includes a magnetic control device, a Z-axis lifting mechanism for controlling the electrode discharge distance, an XY motion platform, and a tray for placing a workpiece. The high-precision liquid metal supply device and the liquid metal storage cylinder are respectively fixed to the Z-axis lifting mechanism, and the tray is fixed to the XY motion platform. The present invention has the beneficial effect of applying a force to the liquid metal at the end of the capillary through a magnetic field by disposing multiple electromagnets uniformly surrounding the edge of the processing tray, thereby preventing deformation of the liquid metal electrode end caused by the accumulation of liquid metal at the electrode end due to tension, working fluid force, gravity, electric field force, etc., and effectively reducing short circuits during processing.

Description

Technical Field

[0001] The invention relates to electric spark machining, in particular to a liquid metal electrode rotating magnetic field shape control device. Background Art

[0002] The magnetic control requirements of liquid metal spark electrodes are as follows:

[0003] Liquid metal electrode EDM, an emerging micro-EDM technology, overcomes the electrode wear common with solid electrodes in traditional precision machining. This method places liquid metal into an insulated tubular tool electrode. The tool electrode does not participate in the discharge, but only provides support for the liquid metal. Liquid metal can be replenished at an appropriate pressure to compensate for consumption during machining, maintaining the electrode tip shape and inter-electrode spacing, avoiding the problems associated with electrode wear and effectively improving machining accuracy and durability.

[0004] However, in order to improve the processing accuracy, the diameter of the processing electrode should be reduced. When replacing with a thinner tubular electrode, due to the influence of tension, the droplets hanging at the end will inevitably appear to be approximately spherical. Inaccurate discharge position and multi-channel discharge are likely to occur during the processing, which is not conducive to precision processing.

[0005] In addition, due to the fluidity of liquid metal, it is more easily affected by small vibrations, working fluid flow, gravity and electric field forces during the processing. On the one hand, this reduces the certainty of the discharge channel. On the other hand, it makes it easy for a large amount of liquid metal to accumulate at the end of the tool electrode and cause a short circuit, which is not conducive to processing.

[0006] In order to maintain machining stability and accuracy, a solution needs to be considered to achieve a relatively stable shape of the liquid electrode tip and improve the efficiency of other processes in EDM.

[0007] Because the discharge current passes through the liquid metal electrode during EDM, the force oscillation of the current-carrying conductor in a rapidly changing magnetic field can be used to achieve micro-control of the shape of the liquid metal electrode tip. This also increases chip removal speed, stimulates discharge activity, and accelerates the deionization process.

[0008] The description of the existing magnetron platform is as follows:

[0009] There are generally four types of magnetic field application forms for EDM platforms:

[0010] 1. Use permanent magnets with fixed poles and constant magnetic field strength.

[0011] 2. Use permanent magnets in combination with rotating shafts, rotating magnetic fields, and variable magnetic poles. By replacing the permanent magnets, the magnetic induction intensity can be changed.

[0012] 3. Use an electromagnet to fix the magnetic poles. The magnetic poles remain unchanged, but the magnetic induction intensity can be changed.

[0013] 4. Use an electromagnet with fixed magnetic poles and variable magnetic poles, and the magnetic induction intensity can be changed.

[0014] 5. Using electromagnets, without fixed magnetic poles, combined with a rotating shaft to achieve variable position and variable magnetic induction intensity.

[0015] Chinese patent CN200810054910.2 describes a design using a permanent magnet guide. Positioned above the workpiece, the guide is adjusted so that the magnetic field is parallel to the axis. This magnetization forces the workpiece particles during processing, increasing their clearance velocity. This mechanism is easy to install and replace, and offers low cost, but suffers from poor shape control.

[0016] Chinese patent CN200610012437.2 describes a magnetic field mechanism that uses two electromagnets to control EDM. Specifically, two electromagnets are placed opposite each other on either side of a machining area, with opposite magnetic poles. Power is applied to the electromagnets to create a magnetic field of 480-520 mT.

[0017] A similar device is also introduced in Chinese patent CN202010094814.1, which also uses two opposing NdFeB strong magnets to provide a constant magnetic field for processing.

[0018] The advantages of the above methods are simple process, low cost, high magnetic field strength, high EDM efficiency, easy chip removal, reduced arcing, and improved hole wall quality. However, they suffer from inflexible magnetic field settings and poor precision, making them inadequate for micro-EDM.

[0019] Chinese patent CN201710197211.2 discloses a magnetic field mechanism design that primarily includes an electromagnet, a guide ring, an angular stepper motor, and a vertical stepper motor. Computer control enables the rotation and vertical changes of the magnetic field, thereby enabling the application of force during the processing of magnetic electrodes. The advantage of this method is that the magnetic field is essentially controllable and the position of the magnetic field is very flexible. However, manufacturing is extremely complex and costly, and the polarity of the magnetic field cannot be changed without changing its position. The introduction of motors and mechanical structures introduces vibrations and virtual displacements, increasing uncertainty in micromachining and making it unsuitable for micromachining.

[0020] Chinese patent CN201610866543.0 replaces the magnetic field with an electric field, achieving resonant shaping of the liquid by biasing the alternating current (AC) power supply 180 degrees at twice the droplet's natural frequency. However, a prominent issue with this electric field design is that the applied alternating electric field can severely affect spark discharge.

[0021] Therefore, how to better achieve micro-control of the shape of the end of the liquid metal electrode is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0022] In order to solve the problems in the prior art, the present invention provides a liquid metal electrode rotating magnetic field shape control device.

[0023] The present invention provides a liquid metal electrode rotating magnetic field control device, including a control system, a magnetic control platform and a liquid injection system, wherein the liquid injection system includes a high-precision liquid metal supply device, a liquid metal storage cylinder and a liquid metal supply capillary, and the magnetic control platform includes a magnetic control device, a Z-axis lifting mechanism for controlling the electrode discharge distance, an XY motion platform and a tray for placing the workpiece, the high-precision liquid metal supply device and the liquid metal storage cylinder are respectively fixed on the Z-axis lifting mechanism, the tray is fixed on the XY motion platform, the high-precision liquid metal supply device and the liquid metal storage cylinder are respectively fixed on the Z-axis lifting mechanism, the tray is fixed on the XY motion platform, and the high-precision liquid metal supply device and the liquid metal storage cylinder are respectively fixed on the Z-axis lifting mechanism. The liquid metal supply capillary is connected to the liquid metal storage cylinder, the high-precision liquid metal supply device can continuously supply liquid metal to the liquid metal storage cylinder, and make the liquid metal flow out of the liquid metal supply capillary in a quantitative manner. The magnetic control device includes at least six groups of electromagnets, which are surrounded by the tray and have the same spacing angle. The magnetic field of the electromagnets can exert force on the liquid metal at the end of the liquid metal supply capillary to control the shape, and the liquid metal at the end of the liquid metal supply capillary forms a liquid metal electrode.

[0024] As a further improvement of the present invention, the electromagnets are cylindrical, and the axes of all the electromagnets intersect at the end of the liquid metal supply capillary.

[0025] As a further improvement of the present invention, the surface of the electromagnet is made of insulating soft magnetic material to form a magnetic column to draw the concentrated magnetic field to the end of the needle of the liquid metal supply capillary to apply a controlled magnetic field.

[0026] As a further improvement of the present invention, the high-precision liquid metal supply device includes a piston and a piston driving mechanism, the piston driving mechanism is connected to the piston, and the piston is installed inside the liquid metal storage cylinder. The piston driving mechanism can drive the piston to move downward, thereby increasing the air pressure above the liquid metal inside the liquid metal storage cylinder, so that the liquid metal flows out of the liquid metal supply capillary in a controlled and quantitative manner.

[0027] As a further improvement of the present invention, the piston driving mechanism includes a stepping motor, a gear transmission mechanism and a screw rod, the stepping motor is connected to the screw rod through the gear transmission mechanism, and the piston is mounted on the screw rod.

[0028] As a further improvement of the present invention, a metal pressing plate is provided on the tray, one end of the metal pressing plate presses the workpiece onto the tray, and the other end is tightly connected to the tray by a bolt. The metal pressing plate is connected to a discharge power supply through a wire, and the discharge power supply, the metal pressing plate, the workpiece, and the liquid metal at the end of the liquid metal supply capillary form a discharge circuit.

[0029] As a further improvement of the present invention, the magnetic control platform also includes a carrying platform and a lifting bracket, the lifting bracket and the XY motion platform are respectively installed on the carrying platform, the Z-axis lifting mechanism is installed on the lifting bracket, the Z-axis lifting mechanism is connected to a Z-axis clamp, and the high-precision liquid metal supply device and the liquid metal storage cylinder are respectively installed on the Z-axis clamp.

[0030] As a further improvement of the present invention, the liquid metal electrode rotating magnetic field control device also includes a flushing system, which includes an oil pump and an oil pump pipeline for injecting insulating oil into the pallet. The oil pump is connected to the oil pump pipeline, and the oil outlet of the oil pump pipeline is installed inside the pallet.

[0031] As a further improvement of the present invention, there are six groups of electromagnets.

[0032] As a further improvement of the present invention, the liquid metal storage cylinder is transparent.

[0033] The beneficial effect of the present invention is that by arranging multiple electromagnets evenly surrounding the edge of the processing tray, a force is applied to the liquid metal at the end of the capillary through the magnetic field, thereby preventing the deformation of the liquid metal electrode end caused by the accumulation of liquid metal at the end of the electrode due to tension, working fluid force, gravity, electric field force, etc., and effectively reducing the short circuit phenomenon during the processing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other solutions can be obtained based on these drawings without paying any creative work.

[0035] Figure 1 It is an overall schematic diagram of a liquid metal electrode rotating magnetic field shape control device of the present invention.

[0036] Figure 2 This is the core schematic diagram of a liquid metal electrode rotating magnetic field shape control device of the present invention.

[0037] Figure 3 It is a peripheral schematic diagram of a liquid metal electrode rotating magnetic field control device of the present invention.

[0038] Figure 4 This is a schematic diagram of liquid injection of a liquid metal electrode rotating magnetic field control device of the present invention.

[0039] Figure 5 It is a schematic diagram of a discharge circuit of a liquid metal electrode rotating magnetic field control device of the present invention. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second" and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0042] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0044] like Figures 1 to 5As shown, a liquid metal electrode rotating magnetic field control device includes a control system, a magnetic control platform and a liquid injection system, wherein the liquid injection system includes a high-precision liquid metal supply device 1, a liquid metal storage cylinder 2 and a liquid metal supply capillary 3, and the magnetic control platform includes a magnetic control device, a Z-axis lifting mechanism for controlling the electrode discharge distance, an XY motion platform 7 and a tray 6 for placing the workpiece, and the high-precision liquid metal supply device 1 and the liquid metal storage cylinder 2 are respectively fixed on the Z-axis lifting mechanism, and the high-precision liquid metal supply device 1 and the liquid metal storage cylinder 2 can be driven by the Z-axis lifting mechanism to perform The tray 6 is fixed on the XY motion platform 7 for up and down movement, and the XY motion platform 7 can be used to drive the tray 6 to move in the XY direction. The high-precision liquid metal supply device 1 is connected to the liquid metal storage cylinder 2, and the liquid metal supply capillary 3 is connected to the liquid metal storage cylinder 2. The high-precision liquid metal supply device 1 can continuously supply liquid metal to the liquid metal storage cylinder 2, and make the liquid metal flow out of the liquid metal supply capillary 3 in a quantitative manner. The high-precision liquid metal supply device 1 can be adjusted to output a suitable pressure according to the pressure display value.

[0045] The magnetic control device includes at least six groups of electromagnets 5, which are surrounded by the tray 6. The electromagnets 5 are spaced at the same angle. The magnetic field of the electromagnets 5 can exert force on the liquid metal at the end of the liquid metal supply capillary 3 to control the shape. The liquid metal at the end of the liquid metal supply capillary 3 forms a liquid metal electrode.

[0046] The workpiece 4 made of conductive non-magnetic material can be fixed in the tray 6 using insulating glue or a clamp (such as a metal pressing plate 11 ), and can be moved in the XY axis driven by the tray 6 .

[0047] The electromagnets 5 are cylindrical, and the axes of all the electromagnets 5 intersect at the end of the liquid metal supply capillary 6 .

[0048] The surface of the electromagnet 5 is made of an insulating soft magnetic material to form a magnetic column to draw the concentrated magnetic field to the end of the liquid metal supply capillary 3 to apply a controlled magnetic field.

[0049] The high-precision liquid metal supply device 1 includes a piston and a piston driving mechanism, the piston driving mechanism is connected to the piston, and the piston is installed in the liquid metal storage cylinder 2. The piston driving mechanism can drive the piston to move downward, thereby increasing the air pressure above the liquid metal inside the liquid metal storage cylinder 2, so that the liquid metal flows out of the liquid metal supply capillary 3 in a controlled and quantitative manner.

[0050] The piston drive mechanism includes a stepper motor 10, a gear transmission mechanism and a screw 21. The stepper motor 10 is connected to the screw 21 through the gear transmission mechanism. The piston is installed on the screw 21. The screw 21 is provided with an injection channel for injecting liquid metal into the liquid metal storage cylinder 2. The gear transmission mechanism includes a meshing driving gear 18 and a driven gear 19. The driven gear 19 is fixed on the screw 21. The driven gear 19 is installed on the Z-axis fixture 14 through the gear pressing plate 20. The stepper motor 10 can drive the screw 21 to rotate through the gear transmission mechanism. The downward movement of the screw 21 drives the piston downward, thereby increasing the air pressure above the liquid metal inside the liquid metal storage cylinder 2, causing the liquid metal to flow out in a controlled and quantitative manner, thereby achieving high-precision and stable liquid supply.

[0051] A metal pressing sheet 11 is provided on the tray 6. One end of the metal pressing sheet 11 presses the workpiece 4 onto the tray 6, and the other end is tightly connected to the tray 6 via a bolt 17. The metal pressing sheet 11 is connected to a discharge power supply via a wire. The discharge power supply, the metal pressing sheet 11, the workpiece 5, and the liquid metal at the end of the liquid metal supply capillary 3 form a discharge circuit. The metal pressing sheet 11 can be in stable contact with the workpiece 4 to form a stable discharge circuit, and the workpiece can be easily replaced.

[0052] The magnetic control platform also includes a carrying platform 12 and a lifting bracket 15. The lifting bracket 15 and the XY motion platform 7 are respectively installed on the carrying platform 12. The Z-axis lifting mechanism is installed on the lifting bracket 15. The Z-axis lifting mechanism is connected to the Z-axis clamp 14. The high-precision liquid metal supply device 1 and the liquid metal storage cylinder 2 are respectively installed on the Z-axis clamp 14.

[0053] The XY motion platform 7 uses an XY motor 8 to drive the lead screw 13 to achieve movement.

[0054] The tray 6 is fixed on the XY motion platform 7 , and the XY axis movement of the XY motion platform 7 is controlled by the knob and the lead screw 13 driven by the fine XY motor 8 .

[0055] The Z-axis lifting mechanism uses a Z-axis motor 9 to drive the lead screw 13 to achieve movement. The Z-axis motor 9 is preferably a stepper motor, and the discharge distance of the electrodes can be controlled by the stepper motor.

[0056] The liquid metal electrode rotating magnetic field control device also includes a flushing system, which includes an oil pump and an oil pump pipeline 16 for injecting insulating oil into the tray 6. The oil pump is connected to the oil pump pipeline 16, and the oil outlet of the oil pump pipeline 16 is installed inside the tray 6. When too much liquid metal flows out, the electrode short-circuits, and the oil pump of the flushing system starts to inject insulating oil into the tray 6 through the pump pipeline 16, thereby promoting the flow of insulating oil in the tray 6 and eliminating the short circuit.

[0057] The electromagnets 5 are preferably arranged in six groups, with the six groups of electromagnets 5 spaced at the same angle, surrounding the tray 6, and using surface-insulated soft magnetic material magnetic poles to pull the concentrated magnetic field to the processing area to apply the magnetic field at the processing area. The purpose of having the same spacing angle is to make the magnetic force generated by each electromagnet at the processing center have the same effect, and to make the magnetic field center coincide with the actual processing center when controlling the changing magnetic field. The purpose of adding magnetic poles is to concentrate the magnetic field, increase the magnetic induction intensity at the processing center as much as possible, improve the utilization rate of the electromagnets, reduce the volume of the magnetic field generating equipment and improve energy utilization efficiency.

[0058] The liquid metal storage cylinder 2 is made of transparent plastic material, which is convenient for observing the liquid metal.

[0059] The control system mainly includes the main control system, power module, magnetic field and drive module, electric spark discharge module, liquid metal replenishment module, flushing module, voltage and current detection module, and motion module.

[0060] The controller is mainly based on the stm32 single-chip microcomputer. It sends out regular square wave signals at a set high speed to control the H-bridge drive circuit, and then control the magnetic field size and polarity of each magnet.

[0061] The computer is used for data recording, setting of microcontroller parameters and movement of each motor on the platform at the beginning of the operation, control of the machining trajectory through the movement of the pallet, and the vertical distance between the electrode and the workpiece at the beginning of machining.

[0062] In the power supply module, the 5V power supply is stepped down from the 24V DC power supply to power the microcontroller, the 24V power supply provides power for the electromagnet, and the pulse power supply is an independent power supply and a dedicated power supply for EDM.

[0063] The magnetic field module consists of an electromagnet and an H-bridge driver module, along with six series-connected current sensors to provide current feedback. Compared to relay solutions, it offers similar cost and significantly improved frequency and lifespan. While maintaining a compact size, it can provide a larger magnetic field and a faster frequency of change.

[0064] Liquid metal supply module: After spark discharge, the liquid metal at the end is consumed and needs to be replenished in time.

[0065] Flushing module: When the discharge gap is filled with impurities or excess liquid metal, the flushing system is started to make the insulating oil flow to remove the impurities in the discharge gap.

[0066] Voltage and current detection module: In the discharge circuit, a voltage detection circuit is connected in parallel across the discharge gap. The voltage is stepped down by a follower and transmitted to the ADC. A 5Ω precision resistor is connected in series with the circuit. The current value is obtained by measuring the voltage across the resistor. All data is transmitted to the computer by the ADC.

[0067] Motion module: The XYZ platform is controlled by three stepper motors and controlled by computer software to set the processing path.

[0068] The invention provides a liquid metal electrode rotating magnetic field shape control device, which has the following advantages:

[0069] 1. The present invention can realize translational motion in any direction in the horizontal plane and circular motion around a certain point in the horizontal plane through the driving system.

[0070] 2. The present invention adopts three power sources (motor or precision knob) to control the three degrees of freedom of XYZ respectively, which is easy to operate, has high processing efficiency and high platform space utilization.

[0071] 3. The XY motion platform 7 in the present invention can achieve a horizontal movement of 50mm*50mm, has a compact structure and is easy to process.

[0072] 4. The present invention provides six electromagnets 5 evenly surrounding the edge of the tray 6, and applies force to the liquid metal at the needle end of the liquid metal supply capillary 3 through the magnetic field, thereby preventing the deformation of the liquid metal electrode end caused by the accumulation of liquid metal at the electrode end due to tension, working fluid force, gravity, electric field force, etc., and effectively reducing the short circuit phenomenon during the processing process.

[0073] 5. The design of the variable magnetic field of the present invention can activate the electric discharge machining, accelerate the deionization process in the electric spark discharge, and at the same time help to discharge impurities in the discharge gap and prevent debris accumulation.

[0074] 6. The precise liquid metal replenishment system can detect the liquid metal consumption according to the discharge machining status. The stepper motor 10 drives the piston at the top of the liquid metal storage cylinder 2 to move, thereby increasing the pressure inside the liquid metal storage cylinder 2 and causing the liquid metal to flow out in a controlled and quantitative manner. This accurately replenishes the liquid metal electrode consumption during machining and effectively prevents short circuits.

[0075] 7. Add a flushing module. When a short circuit is detected, start the oil pump in the flushing system and inject insulating oil into the tray 6 through the pump pipe 16 to promote the flow of working fluid in the inter-electrode gap, eliminate the accumulation of impurities in the gap, and the gray fine droplets scattered by the discharge of liquid metal, further preventing short circuit.

[0076] 8. The tray 6 can be used to recover liquid metal. After the liquid metal is electrospark machined, the gray fine droplets dispersed in the working fluid remain in the tray 6, which is more convenient to collect. After the pickling precipitation is collected and purified, it can be reused, thereby reducing costs.

[0077] 9. The metal pressing sheet 11 is used as a fixture design, replacing the design of using copper foil tape to fix the silicon wafer. The metal pressing sheet 11 fixed on the tray 6 provides a continuous and stable fastening force, which can keep the workpiece 4 stable. At the same time, due to the conductive characteristics of the metal pressing sheet 11, it can provide a stable conductive connection and make it easy to replace the workpiece.

[0078] 10. It can realize real-time detection and adjustment and automatically control the processing flow.

[0079] 11. Manual remote control can be achieved under computer control.

[0080] The present invention provides a liquid metal electrode rotating magnetic field shape control device, which relates to the technical field of liquid phase electrode electrospark machining, and specifically to liquid gallium indium tin alloy electrode electrospark machining of non-magnetic materials, liquid metal electrode shape control at the discharge end, ionization path activation, promotion of deionization process, and can be used for fine adjustment of discharge position accuracy in fine machining control links.

[0081] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A liquid metal electrode rotating magnetic field shape control device, characterized by: The invention comprises a control system, a magnetron platform and a liquid injection system, wherein the liquid injection system comprises a high-precision liquid metal supply device, a liquid metal storage cylinder and a liquid metal supply capillary, the magnetron platform comprises a magnetron device, a Z-axis lifting mechanism for controlling the discharge distance of the electrode, an XY motion platform and a tray for placing the workpiece, the high-precision liquid metal supply device and the liquid metal storage cylinder are respectively fixed on the Z-axis lifting mechanism, the tray is fixed on the XY motion platform, the high-precision liquid metal supply device is connected to the liquid metal storage cylinder, the liquid metal supply capillary is connected to the liquid metal storage cylinder, and the high-precision liquid metal supply device can continuously supply liquid metal to the workpiece. The liquid metal storage cylinder is configured to allow the liquid metal to flow out of the liquid metal supply capillary in a quantitative manner. The magnetic control device includes six groups of electromagnets, which are arranged around the tray and have the same spacing angles. The magnetic field of the electromagnets can exert a force on the liquid metal at the end of the liquid metal supply capillary to control the shape. The liquid metal at the end of the liquid metal supply capillary forms a liquid metal electrode. The electromagnet is cylindrical, and the axes of all the electromagnets intersect at the end of the liquid metal supply capillary. The surface of the electromagnet uses an insulating soft magnetic material to form a magnetic column to pull the concentrated magnetic field to the end of the liquid metal supply capillary to apply a shape-controlling magnetic field.

2. The liquid metal electrode rotating magnetic field shaping device according to claim 1, characterized in that: The high-precision liquid metal supply device includes a piston and a piston driving mechanism. The piston driving mechanism is connected to the piston, and the piston is installed in the liquid metal storage cylinder. The piston driving mechanism can drive the piston to move downward, thereby increasing the air pressure above the liquid metal inside the liquid metal storage cylinder, so that the liquid metal flows out of the liquid metal supply capillary in a controlled and quantitative manner.

3. The liquid metal electrode rotating magnetic field shaping device according to claim 2, characterized in that: The piston driving mechanism includes a stepping motor, a gear transmission mechanism and a screw rod. The stepping motor is connected to the screw rod through the gear transmission mechanism, and the piston is installed on the screw rod.

4. The liquid metal electrode rotating magnetic field shaping device according to claim 1, characterized in that: A metal pressing sheet is provided on the tray, one end of the metal pressing sheet presses the workpiece onto the tray, and the other end is tightly connected to the tray by a bolt. The metal pressing sheet is connected to a discharge power supply through a wire. The discharge power supply, the metal pressing sheet, the workpiece, and the liquid metal at the end of the liquid metal supply capillary form a discharge circuit.

5. The liquid metal electrode rotating magnetic field shaping device according to claim 1, characterized in that: The magnetic control platform also includes a carrying platform and a lifting bracket. The lifting bracket and the XY motion platform are respectively installed on the carrying platform. The Z-axis lifting mechanism is installed on the lifting bracket. The Z-axis lifting mechanism is connected to a Z-axis clamp. The high-precision liquid metal supply device and the liquid metal storage cylinder are respectively installed on the Z-axis clamp.

6. The liquid metal electrode rotating magnetic field shaping device according to claim 1, characterized in that: The liquid metal electrode rotating magnetic field control device also includes a flushing system, which includes an oil pump and an oil pump pipeline for injecting insulating oil into the tray. The oil pump is connected to the oil pump pipeline, and the oil outlet of the oil pump pipeline is installed inside the tray.

7. The liquid metal electrode rotating magnetic field shaping device according to claim 1, characterized in that: The liquid metal storage cylinder is transparent.

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