An immersion magnetic field assisted electrochemical mechanical polishing device for additive manufacturing of a spatial lattice lattice

Abstract

This application discloses an immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing of space lattice points, comprising: a spindle system unit, which includes a Z-axis linear module, a Y-axis linear module, a spindle motor, and a spindle. The Z-axis linear module is mounted on the Y-axis linear module, and the spindle motor is mounted on the Z-axis linear module. The output end of the spindle motor is connected to the spindle, and the spindle is fitted with a clamp for holding the workpiece; an electrolytic cell, which is filled with electrolyte and magnetic abrasive particles, and has a cathode; a magnetic field generator, which includes multiple electromagnetic coils, which are sleeved on the outside of the electrolytic cell. By adjusting the current and phase of each electromagnetic coil, a magnetic field is formed inside the electrolytic cell; a cleaning tank for cleaning the workpiece; and a controller for controlling the working state of the device. This device uses electrochemical corrosion and mechanical friction in combination to efficiently process the space lattice points, thereby improving the surface quality and smoothness of the lattice points.

Description

Technical Field

[0001] This invention belongs to the technical field of polishing devices, and particularly relates to an immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing of spatial lattice points. Background Technology

[0002] Space lattice is a microstructure with a regular arrangement, possessing excellent mechanical and thermal conductivity properties, thus showing broad application prospects in aerospace, automotive manufacturing, and medical devices. However, due to its complex structural characteristics, common surface treatment methods include chemical polishing and sandblasting. Chemical polishing may alter the chemical composition of the material surface, causing environmental pollution, and it is difficult to achieve uniform treatment for complex space lattice structures. Sandblasting is difficult to handle space lattice structures with complex shapes and structures, such as internal cavities and tiny holes, and may leave micro-scratches, unevenness, and deformation on the surface, leading to increased surface roughness, and even introducing cracks and stress concentration, affecting the mechanical properties and durability of the material, and its efficiency is low. Therefore, traditional surface treatment methods often fail to meet the requirements of high-precision and high-efficiency processing. Thus, a novel surface treatment technology is needed to meet the surface treatment requirements of additive manufacturing space lattice. Summary of the Invention

[0003] The purpose of this invention is to solve at least one problem in the prior art by proposing an immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing of spatial lattice points.

[0004] To achieve the above objectives, this invention proposes an immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing of space lattice points, comprising:

[0005] The spindle system unit includes a Z-axis linear module, a Y-axis linear module, a spindle motor, and a spindle. The Z-axis linear module is mounted on the Y-axis linear module, and the spindle motor is mounted on the Z-axis linear module. The output end of the spindle motor is connected to the spindle. The spindle is equipped with a fixture for clamping workpieces, and the fixture or workpiece is connected to the positive terminal of the power supply.

[0006] An electrolytic cell, the electrolytic cell being filled with electrolyte and magnetic abrasive particles, and the electrolytic cell being provided with a cathode for connecting to the negative terminal of a power supply;

[0007] A magnetic field generator, comprising multiple electromagnetic coils, which are sleeved on the outside of an electrolytic cell. By changing the current and phase of each electromagnetic coil, the strength and direction of the generated magnetic field are adjusted, thereby forming a magnetic field with a specific direction inside the electrolytic cell.

[0008] A high magnetic permeability component is disposed around the cathode or around the workpiece that requires a stronger magnetic field, thereby regulating the non-uniformity of the magnetic field inside the electrolytic cell. By adjusting the non-uniformity of the magnetic field, the flow of electrolyte and magnetic abrasive particles is affected, thus achieving uniform polishing of the workpiece surface.

[0009] A cleaning tank, wherein a cleaning assembly for cleaning workpieces is provided inside the cleaning tank;

[0010] The controller is used to control the working status of the Z-axis linear module, the Y-axis linear module, the spindle motor, the magnetic field generator, the current and phase flowing to the electromagnetic coil, and the electric field current between the anode and the cathode.

[0011] Preferably, the electrolytic cell is provided with an inlet pipe and an outlet pipe. The outlet pipe is connected to a collection device, which is used to collect magnetic abrasive particles. The collection device is connected to the inlet pipe via a circulation pump.

[0012] Preferably, the electrolytic cell is equipped with a stirrer, and the inner wall of the electrolytic cell is coated with an anti-rust and anti-corrosion coating.

[0013] Preferably, the cathode is suspended around the electrolytic cell by hooks.

[0014] Preferably, the cleaning assembly includes a spray pipe and a spray head, the cleaning tank is provided with cleaning liquid and a pump, the spray head is connected to the spray pipe, and the spray pipe is connected to the pump.

[0015] Preferably, the cleaning component is an ultrasonic cleaner.

[0016] Preferably, the cleaning tank is equipped with a liquid level sensor, and the cleaning tank is equipped with a drain port and a filling port, both of which are equipped with control valves.

[0017] Preferably, the device also includes a drying device, which includes a blower for drying the cleaned workpiece.

[0018] Preferably, the electrolytic cell is equipped with a pH sensor, a conductivity sensor, and a current sensor that are electrically connected to the controller.

[0019] Preferably, the electrolyte is prepared by mixing one or more of NaCl, NaNO3, NaClO3, disodium ethylenediaminetetraacetate, sodium metasilicate, sodium hexametaphosphate, glacial acetic acid, citric acid, oxalic acid, anhydrous ethanol, ethylene glycol, propylene glycol, butanediol, glycerol, and triethanolamine with deionized water. The magnetic abrasive particles are one or more of carbonyl iron powder, Fe3O4 abrasive particles, iron boron abrasive particles, chromium iron abrasive particles, and tungsten abrasive particles, and the particle size of the magnetic abrasive particles is 400#-1000#.

[0020] The beneficial effects of this invention are:

[0021] 1. This invention combines the advantages of electrochemical corrosion and mechanical polishing. By applying an electric field and a non-uniform magnetic field in the electrolyte, and utilizing the synergistic effect of electrochemical corrosion and mechanical friction, it can achieve efficient treatment of the surface of a spatial lattice in a short time, improve the surface quality and smoothness of the lattice, and reduce damage and deformation to the lattice material.

[0022] 2. This invention enables fine processing of the surface of a spatial lattice at the microscale. By controlling the non-uniformity of the magnetic field and the electric field, the electrochemical polishing process can be finely controlled, effectively controlling the depth, uniformity, and surface morphology of the processing. It can handle complex surface structures and has strong versatility and applicability.

[0023] 3. Compared with traditional chemical treatment methods, the present invention generates less waste liquid during magnetic field-assisted electrochemical mechanical polishing, has a smaller impact on the environment, and has certain environmental protection advantages.

[0024] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. Attached Figure Description

[0025] Figure 1 This is a structural schematic diagram of an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present invention.

[0027] Figure 3 This is a left view of the internal structure of an embodiment of the present invention.

[0028] Figure 4 This is a schematic diagram of the spindle system unit according to an embodiment of the present invention.

[0029] Figure 5 This is a schematic diagram showing the original roughness and surface morphology results of the space lattice in an embodiment of the present invention.

[0030] Figure 6 This is a schematic diagram showing the roughness and surface morphology results after polishing of the space lattice in an embodiment of the present invention.

[0031] In the diagram: 1. Cabinet; 2. Y-axis linear module; 3. Z-axis linear module; 4. Electrolytic cell; 5. Spindle motor; 6. Spindle; 7. Cleaning tank. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. In the description of this application, it should be noted that the terms "inner," "outer," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] The present invention will now be described in detail with reference to the accompanying drawings.

[0035] See Figure 1 , Figure 2 , Figure 3 and Figure 4 This embodiment provides an immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing of space lattice points, comprising:

[0036] The spindle system unit includes a Z-axis linear module 3, a Y-axis linear module 2, a spindle motor 5, and a spindle 6. The Z-axis linear module 3 is mounted on the Y-axis linear module 2 and is used to drive and control the spindle 6 to move along the Z-axis (i.e., the vertical direction). The Y-axis linear module 2 is used to drive and control the Z-axis linear module 3 and the spindle 6 to move synchronously along the Y-axis (i.e., the horizontal direction). The spindle motor 5 is mounted on the Z-axis linear module 3, and the output end of the spindle motor 5 is connected to the spindle 6. The spindle 6 is fitted with a fixture for clamping the workpiece. The fixture or the workpiece is connected to the positive terminal of the power supply so that the workpiece or the fixture is the anode.

[0037] Electrolytic cell 4, which is filled with electrolyte and magnetic abrasive particles, and is provided with a cathode for connecting to the negative terminal of the power supply;

[0038] A magnetic field generator includes multiple electromagnetic coils, which are sleeved on the outside of an electrolytic cell. By changing the current and phase of each electromagnetic coil, the strength and direction of the generated magnetic field are adjusted, so that a magnetic field with a specific direction is formed inside the electrolytic cell.

[0039] High magnetic permeability components are placed around the cathode or around the workpiece that requires a stronger magnetic field, thereby regulating the non-uniformity of the magnetic field inside the electrolytic cell. By adjusting the non-uniformity of the magnetic field, the flow of electrolyte and magnetic abrasive particles is affected, achieving uniform polishing of the workpiece surface.

[0040] Cleaning tank 7, which is equipped with a cleaning component for cleaning workpieces;

[0041] The controller is used to control the working status of the Z-axis linear module 3, the Y-axis linear module 2, the spindle motor 5, the magnetic field generator, the current and phase flowing to the electromagnetic coil, and the electric field current between the anode and the cathode.

[0042] In actual use, the workpiece to be polished is connected to the positive terminal of the power supply. The fixture is mounted on the spindle 6 via a quick-change connector, allowing for the replacement of different fixtures according to the different shapes and sizes of the workpiece. The magnetic field generator is used to generate a magnetic field perpendicular to the electrodes. Magnetic abrasive grains move relative to the workpiece under the influence of the magnetic field, used for electrochemical mechanical polishing. The current intensity of the electromagnetic coils can vary from a few milliamps to a few amps, depending on the required magnetic field strength. A larger current (e.g., 800 mA) is applied to the electromagnetic coil located in the center, while the remaining electromagnetic coils, located further away from the center, are in a weak magnetic field region and are applied with a smaller current (e.g., 100 mA). (mA) Areas of the workpiece with high surface roughness require increased magnetic field strength to ensure uniform processing. By applying different phases (e.g., 0 degrees, 90 degrees, 180 degrees) between multiple adjacent electromagnetic coils, each electromagnetic coil can generate a different magnetic field direction. The current of the electromagnetic coil is controlled by the phase difference. By changing the phase difference, the current can be used to achieve alternating aggregation, forming a magnetic field in a specific direction, strengthening or weakening the magnetic field effect in a local area. The magnetic field is used to change the movement direction and speed of ions in the electrolyte to optimize the current distribution during the polishing process. Alternating electric and magnetic fields at a certain frequency affect the ion distribution and electrolyte flow on the workpiece surface, thereby achieving more uniform material removal. This not only improves polishing efficiency but also reduces local over-corrosion of materials, helping to solve the problem of inconsistent polishing results, and is especially suitable for processing complex microstructures. The spindle system unit, electrolytic tank 4, magnetic field generator, and cleaning tank 7 are all located inside the cabinet 1. The cabinet 1 is equipped with an opening and closing door and a control panel. The control panel is electrically connected to the controller and has a display screen and control buttons for operating the control device. Rollers are provided at the bottom of the cabinet 1.

[0043] A high-permeability component, made of iron, nickel, or their alloys, is placed around the cathode. Larger or thicker magnetically conductive materials (such as iron or nickel) are arranged around the workpiece where a stronger magnetic field is needed. For example, placing an iron disc around a specific electromagnetic coil achieves a predetermined magnetic field direction, concentrating the magnetic field in a specific area of ​​the workpiece. This provides a stronger magnetic field to the workpiece surface, enhancing the reaction rate, improving polishing quality, and ensuring surface smoothness. Depending on requirements, multiple small pieces of magnetically conductive material can be placed around the workpiece away from the fixture. The dispersed arrangement of these points creates magnetic fields of varying widths, allowing control over the non-uniformity of the magnetic field over a larger area, thus meeting the polishing needs of complex curved surfaces. The shape and structure of the cathode can guide the flow of magnetic lines of force, strengthening (concentrating) the magnetic field in certain areas while weakening (dispersing) it in others. The high-permeability component uses a conical structure, concentrating the magnetic field at one end and diffusing it at the other. Proper design can create the desired non-uniform magnetic field distribution, further ensuring the uniformity and efficiency of the polishing effect, resulting in higher magnetic field strength in certain areas, and consequently affecting the chemical reaction rate.

[0044] Both the Z-axis linear module 3 and the Y-axis linear module 2 are lead screw and slider modules. In order to improve the movement stability of the lead screw and slider module, corresponding guide rails can also be set so that the slider moves linearly along the guide rails. The Z-axis linear module 3 is vertically mounted on the slider of the Y-axis linear module 2. The Z-axis linear module 3 and the Y-axis linear module 2 can drive and control the Y-axis and Z-axis movement positions of the workpiece.

[0045] The Z-axis linear module 3 and the Y-axis linear module 2 can also adopt an electric actuator structure, which can realize the Z-axis and Y-axis movement position control of the spindle through the electric actuator.

[0046] In this embodiment, the electrolytic cell 4 is provided with an inlet pipe and an outlet pipe. The outlet pipe is connected to a collection device, which is used to collect magnetic abrasive particles. The collection device is connected to the inlet pipe through a circulation pump.

[0047] In this embodiment, a stirrer is installed inside the electrolytic cell 4, and the inner wall of the electrolytic cell 4 is coated with an anti-rust and anti-corrosion coating. The stirrer allows the magnetic abrasive and electrolyte to mix more evenly. Of course, to protect the stirrer and the electrolytic cell 4, anti-rust treatments such as nickel plating or chromium plating can also be applied to their surfaces.

[0048] In this embodiment, the cathode is suspended around the electrolytic cell 4 by hooks.

[0049] In this embodiment, the cleaning assembly includes a spray pipe and a spray head. A cleaning solution and a pump are installed in the cleaning tank. The spray head is connected to the spray pipe, and the spray pipe is connected to the pump. The cleaning solution is deionized water or ethanol. To facilitate intelligent spraying, a sensor for detecting the arrival of a workpiece can also be installed on the cleaning tank. The sensor type includes, but is not limited to, a laser sensor. When the sensor detects the workpiece arriving in the cleaning tank, it sends a sensing signal to the controller. The controller receives the signal, processes it, and outputs a control signal to the pump and the spray head to perform spray cleaning on the workpiece. The spraying time of the spray head can be set according to requirements.

[0050] In this embodiment, the cleaning component is an ultrasonic cleaner, which can clean the workpiece more thoroughly.

[0051] In this embodiment, a liquid level sensor is installed in the cleaning tank 7. The cleaning tank is equipped with a drain port and a filling port. Both the drain port and the filling port are equipped with control valves. When the liquid level in the cleaning tank exceeds a predetermined position, the control valve of the drain port opens to drain the liquid. When the liquid level in the cleaning tank is lower than the predetermined position, the control valve of the filling port opens to replenish the cleaning liquid.

[0052] In this embodiment, the device further includes a drying device, which includes a hair dryer. The drying device is used to dry the cleaned workpiece. The hair dryer can be a single unit or multiple units, which can quickly dry the workpiece.

[0053] In this embodiment, the electrolytic cell 4 is equipped with a pH sensor, a conductivity sensor, and a current sensor that are electrically connected to the controller, so as to monitor parameters such as pH value, conductivity, and current density of the electrolyte in real time, and automatically adjust the applied voltage and current according to the detected values.

[0054] In this embodiment, the electrolyte is prepared by mixing one or more of the following: NaCl, NaNO3, NaClO3, disodium ethylenediaminetetraacetate, sodium metasilicate, sodium hexametaphosphate, glacial acetic acid, citric acid, oxalic acid, anhydrous ethanol, ethylene glycol, propylene glycol, butanediol, glycerol, and triethanolamine with deionized water. The magnetic abrasive particles are one or more of the following: carbonyl iron powder, Fe3O4 abrasive particles, iron boron abrasive particles, chromium iron abrasive particles, and tungsten abrasive particles. The particle size of the magnetic abrasive particles is 400#-1000#.

[0055] Working process of this invention:

[0056] When this additive manufacturing space lattice immersion magnetic field-assisted electrochemical mechanical polishing device is in operation...

[0057] The first step is to mix the electrolyte and magnetic abrasive particles and pour them into the electrolytic cell. The mixture is more uniform under the action of the stirrer. The additive manufacturing space lattice sample workpiece to be processed is fixedly installed on the fixture. The working state of the Z-axis linear module and the Y-axis linear module is controlled and adjusted by the controller to adjust the spatial movement position of the workpiece so that it is immersed in the electrolyte in the electrolytic cell. The spindle motor is started and drives the workpiece to rotate after the spindle motor is working.

[0058] The second step is to activate the magnetic field: turn on the power supply connected to the electromagnetic coil, adjust the current intensity and phase of the electromagnetic coil at different positions to generate a non-uniform magnetic field distribution inside the electrolytic cell; select a suitable cathode shape according to the shape and size of the workpiece to be polished, and place multiple small pieces of magnetic conductive material on the cathode to create a magnetic field of varying widths, which can control the non-uniformity of the magnetic field over a larger area; at the same time, the high-speed movement of the magnetic abrasive particles in the magnetic field removes the residues produced by corrosion, thus achieving the polishing requirements of complex curved surfaces;

[0059] The third step is to start electrolysis and perform electrochemical-mechanical composite polishing: connect the positive and negative terminals of the power supply to the additive manufacturing space lattice sample workpiece and the cathode, respectively. Set the voltage and current parameters through the control panel of the controller, turn on the electrolysis switch, and generate an electrolytic reaction between the cathode and the anode. Under the dual action of electrolysis and magnetic field, the sample surface undergoes electrochemical corrosion processing.

[0060] Step 4, Cleanup after completion: When the designed shape is achieved, turn off the power switch to de-energize the electromagnetic coil.

[0061] The workpieces enter the cleaning station and the drying station in sequence. The cleaning liquid in the cleaning tank is sprayed out by the nozzle to clean the residue on the surface of the workpiece to be polished. After cleaning, the blower blows air onto the surface of the workpiece to dry it. Finally, the morphology is checked to determine whether it meets the design requirements. If further processing is required, the process returns to the second step and continues until the morphology meets the design requirements.

[0062] The spindle motor rotates at 60 rpm, resulting in more uniform electrochemical mechanical polishing. The additive manufacturing space lattice sample workpiece to be processed is a BCC lattice sample designed to contain 4×4×4 units, with the structural unit size fixed at 5×5×5 mm. 3 The material was manufactured from TC4 titanium alloy powder via selective laser melting. Preliminary surface morphology measurements were performed using a white light interferometer and scanning electron microscope (SEM) to create an additively fabricated spatial lattice. The resulting initial roughness and surface morphology are shown below. Figure 5 As shown, the surface roughness is 41.582–69.658 µm, and its surface contains a large number of defects such as unmelted powder, with an indistinct crystal structure; while the surface roughness and surface morphology of the additively manufactured space lattice after magnetic field-assisted electrochemical mechanical polishing are as follows: Figure 6 As shown, after polishing, surface defects such as unmelted powder are basically removed, the surface uniformity of the workpiece is improved, and the surface roughness is reduced to 17.469-22.800µm.

[0063] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. An immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing of space lattice points, characterized in that... ,include: The spindle system unit includes a Z-axis linear module, a Y-axis linear module, a spindle motor, and a spindle. The Z-axis linear module is mounted on the Y-axis linear module, and the spindle motor is mounted on the Z-axis linear module. The output end of the spindle motor is connected to the spindle. The spindle is equipped with a fixture for clamping workpieces, and the fixture or workpiece is connected to the positive terminal of the power supply. An electrolytic cell, the electrolytic cell being filled with electrolyte and magnetic abrasive particles, and the electrolytic cell being provided with a cathode for connecting to the negative terminal of a power supply; A magnetic field generator, comprising multiple electromagnetic coils, which are sleeved on the outside of an electrolytic cell. By changing the current and phase of each electromagnetic coil, the strength and direction of the generated magnetic field are adjusted, thereby forming a magnetic field with a specific direction inside the electrolytic cell. A high magnetic permeability component is disposed around the cathode or around the workpiece that requires a stronger magnetic field, thereby regulating the non-uniformity of the magnetic field inside the electrolytic cell. By adjusting the non-uniformity of the magnetic field, the flow of electrolyte and magnetic abrasive particles is affected, thus achieving uniform polishing of the workpiece surface. A cleaning tank, wherein a cleaning assembly for cleaning workpieces is provided inside the cleaning tank; The controller is used to control the working status of the Z-axis linear module, the Y-axis linear module, the spindle motor, the magnetic field generator, the current and phase flowing to the electromagnetic coil, and the electric field current between the anode and the cathode.

2. The immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing space lattice as described in claim 1, characterized in that: The electrolytic cell is equipped with an inlet pipe and an outlet pipe. The outlet pipe is connected to a collection device, which is used to collect magnetic abrasive particles. The collection device is connected to the inlet pipe via a circulation pump.

3. The immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing space lattice as described in claim 1, characterized in that: The electrolytic cell is equipped with a stirrer, and the inner wall of the electrolytic cell is coated with an anti-rust and anti-corrosion coating.

4. The immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing space lattice as described in claim 1, characterized in that: The cathode is suspended around the electrolytic cell by hooks.

5. The immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing space lattice as described in claim 1, characterized in that: The cleaning assembly includes a spray pipe and a spray head. The cleaning tank is equipped with cleaning liquid and a pump. The spray head is connected to the spray pipe, and the spray pipe is connected to the pump.

6. The immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing space lattice as described in claim 1, characterized in that: The cleaning component is an ultrasonic cleaner.

7. The immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing space lattice as described in claim 1 or 5, characterized in that: The cleaning tank is equipped with a liquid level sensor, a drain port and a filling port, and both the drain port and the filling port are equipped with control valves.

8. The immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing space lattice as described in claim 1, characterized in that: It also includes a drying device, which includes a blower and is used to dry the cleaned workpiece.

9. The immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing space lattice as described in claim 1, characterized in that: The electrolytic cell is equipped with a pH sensor, a conductivity sensor, and a current sensor that are electrically connected to the controller.

10. The immersion magnetic field-assisted electrochemical mechanical polishing device for additive manufacturing space lattice as described in claim 1, characterized in that: The electrolyte is prepared by mixing one or more of the following: NaCl, NaNO3, NaClO3, disodium ethylenediaminetetraacetate, sodium metasilicate, sodium hexametaphosphate, glacial acetic acid, citric acid, oxalic acid, anhydrous ethanol, ethylene glycol, propylene glycol, butanediol, glycerol, and triethanolamine with deionized water. The magnetic abrasive particles are one or more of the following: carbonyl iron powder, Fe3O4 abrasive particles, iron boron abrasive particles, chromium iron abrasive particles, and tungsten abrasive particles. The particle size of the magnetic abrasive particles is 400#-1000#.

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