Adjustable multi-electrode electrolysis turning machining device and machining method

Abstract

The invention discloses an adjustable multi-electrode electrolytic turning device and method.The adjustable multi-electrode electrolytic turning device comprises a rotary driving device, a multi-electrode device and a movable driving device, the multi-electrode device comprises an annular base, an adjusting device and a plurality of tool electrode tips, and the annular base is provided with a circumferential annular sliding groove and a radial linear sliding groove; the adjusting device comprises a disc rotating in the annular sliding groove, a first driving device driving the disc to rotate and a plurality of sliding blocks moving along the linear sliding groove, a spiral guide rail is arranged on the upper surface of the disc, teeth are arranged on the lower surfaces of the sliding blocks, the teeth on the lower surfaces of the sliding blocks are matched with the spiral guide rail, and when the disc rotates, the sliding blocks slide along the linear sliding groove. The sliding block is fixed to the tool electrode tip through the pressure sensor. Large-allowance removal of shaft part difficult-to-cut materials is achieved in a multi-electrode distribution mode, a driving device composed of an end face gear and a spiral guide rail is adopted, it is guaranteed that machining gaps between all electrodes and a workpiece are consistent, system errors are reduced through feedback of a pressure sensor, and the machining precision is high.

Description

Technical Field

[0001] This invention relates to electrochemical machining, and more particularly to an adjustable multi-electrode electrolytic turning apparatus and method. Background Technology

[0002] Shaft parts have important applications in aerospace, deep-sea equipment and energy equipment. In order to adapt to extreme working environments, shaft parts are mostly made of high-strength and corrosion-resistant metals such as titanium alloys and nickel-based high-temperature alloys. However, these metals have problems such as large cutting forces, severe work hardening and rapid tool wear in traditional turning processes. Especially when removing large amounts of material from shaft parts, the processing cost is high and the efficiency is low, which makes it difficult to meet the needs of modern manufacturing industry for low-cost and high-efficiency manufacturing.

[0003] Electrolytic turning mainly utilizes a simple rod-shaped structure as the tool electrode and the workpiece as the anode. Under high-speed flowing electrolyte, the material on the surface of the workpiece is electrochemically dissolved and removed. During the process, the tool electrode does not contact the workpiece surface and no mechanical cutting force is generated. Therefore, there is no tool damage and no recast layer, residual stress, burrs, etc. It has low processing cost and high efficiency, and is suitable for removing large amounts of difficult-to-machine materials from shaft parts at low cost and high efficiency.

[0004] Currently, scholars have conducted relevant research on electrolytic turning equipment and methods. Among the existing technologies, the invention patent application with application number 202010359705.8 proposes a radial electrolytic turning method and implementation device for a block-shaped internal spray tool. By setting a sealing cavity on the outside of the block-shaped internal spray tool, the divergent flow of the electrolyte can be effectively constrained, improving the stability of electrolytic turning. However, this scheme uses a single electrode for processing and cannot perform efficient electrolytic machining on large-sized shaft parts. Another example is the invention patent with application number 202310923639.6, which proposes a radially telescopic adjustable electrolytic machining cathode. Through the radial telescopic movement of multiple cathode teeth, it can achieve efficient and precise electrolytic machining of large aspect ratio shaft-like complex components with small end diameters and large inner cavities. However, this invention is only applicable to machining the inner cavity of hollow shafts and cannot machine the outer surface of shaft parts.

[0005] Currently, existing machining equipment cannot achieve efficient electrolytic machining of the outer surface of shaft parts. There are no effective reports on multi-electrode structures, radial adjustment devices, and machining methods for efficient machining of the outer surface of shaft parts, which limits the application of electrolytic turning in the removal of large allowances from difficult-to-cut materials in shaft parts. Summary of the Invention

[0006] Objective of the Invention: To address the aforementioned problems, the objective of this invention is to provide a highly efficient adjustable multi-electrode electrolytic turning apparatus and a method for adjustable multi-electrode electrolytic turning.

[0007] Technical Solution: To solve the above problems, the present invention provides an adjustable multi-electrode electrolytic turning apparatus, comprising a rotary drive device for rotating the workpiece, a multi-electrode device, and a moving drive device for moving the multi-electrode device. The multi-electrode device includes an annular base, an adjustment device, and several tool electrode heads. The tool electrode heads are used to spray electrolyte onto the workpiece surface. The annular base is provided with a circumferential annular groove and a radial linear groove. The adjustment device includes a disk rotating within the annular groove, a first drive device for driving the disk to rotate, and several sliders moving along the linear grooves. A helical guide rail is provided on the upper surface of the disk, and teeth are provided on the lower surface of the sliders. The teeth on the lower surface of the sliders cooperate with the helical guide rail. When the first drive device drives the disk to rotate, the sliders slide along the linear grooves under the drive of the helical guide rail. The sliders are fixed to the tool electrode heads by a pressure sensor. The movement of the sliders drives the tool electrode heads to move, thereby bringing the tool electrode heads closer to or away from the workpiece. The pressure sensor is used to sense the pressure signal when the tool electrode heads contact the workpiece.

[0008] Furthermore, the tool electrode head includes a constricting cavity for spraying electrolyte. One end of the constricting cavity is provided with an inlet and the other end with an outlet. The inlet is used to connect to a hose for supplying electrolyte, and the cross-sectional area of ​​the outlet gradually decreases along the outlet direction.

[0009] Furthermore, the end of the tool electrode head closest to the workpiece has an arc-shaped end face, and the arc-shaped end face adopts an arc surface structure that matches the surface of the workpiece.

[0010] Furthermore, the first driving device includes a first driving motor fixed on an annular base, a drive gear fixed to the output shaft of the first driving motor, and lower end face teeth disposed on the lower surface of the disk. The drive gear meshes with the lower end face teeth, the first driving motor drives the drive gear to rotate, and the drive gear drives the disk to rotate.

[0011] Furthermore, the annular base includes an upper end cover and a lower end cover. The upper surface of the lower end cover is provided with a stepped surface, which includes a first end face and a second end face. The upper end cover contacts the first end face, and an annular groove is formed between the lower end face and the second end face of the upper end cover.

[0012] Furthermore, the linear slide groove is provided on the upper end cover, and raised convex slide rails are provided on both sides of the linear slide groove. Grooves are provided on both sides of the slider corresponding to the convex slide rails, and the convex slide rails are inserted into the grooves.

[0013] Furthermore, the multi-electrode device includes four tool electrode heads, which are evenly distributed circumferentially on the annular base.

[0014] The adjustable multi-electrode electrolytic turning method of the present invention includes the following steps:

[0015] Step 1: Install the workpiece on the rotary drive device, and drive the multi-electrode device through the moving drive device so that the tool electrode head surrounds the outer periphery of the workpiece and is coaxial with the workpiece.

[0016] Step 2: Move the tool electrode head closer to the workpiece using the first driving device;

[0017] Step 3: The recognition signal of the pressure sensor is detected. At this time, the tool electrode head is in contact with the workpiece surface. The first driving device is controlled to move the tool electrode head away from the workpiece to a preset distance.

[0018] Step 4: Drive the multi-electrode device to the initial processing position using the moving drive device;

[0019] Step 5: The rotary drive device drives the workpiece to rotate, supplies electrolyte to the multi-electrode device, and applies potential between the tool electrode head and the workpiece;

[0020] Step 6: The moving drive device drives the multi-electrode device to feed along the workpiece;

[0021] Step 7: After a single feed is completed, the potential applied between the tool electrode head and the workpiece is turned off, the electrolyte supply is turned off, the workpiece rotation is stopped, and the tool electrode head is moved closer to the workpiece by the first drive device; after detecting the recognition signal of the pressure sensor, the first drive device is controlled to move the tool electrode head away from the workpiece to a preset distance.

[0022] Step 8: The rotary drive device drives the workpiece to rotate, supplies electrolyte to the multi-electrode device, and applies potential between the tool electrode head and the workpiece. The moving drive device drives the multi-electrode device to move outward along the workpiece.

[0023] Step 9: Repeat steps 5 to 8 to process the workpiece back and forth multiple times until the workpiece meets the processing requirements. Then, turn off the potential applied between the tool electrode head and the workpiece, turn off the electrolyte supply, stop the workpiece rotation, and move the multi-electrode device out of the processing area using the moving drive device.

[0024] Furthermore, the preset distance ranges from 0.2 to 0.6 mm. The potential applied between the tool electrode head and the workpiece ranges from 70 to 80 V.

[0025] Beneficial effects: Compared with the prior art, the significant advantages of this invention are:

[0026] (1) By adopting a multi-electrode distribution with at least two pairs of oppositely arranged electrodes, the coverage area on the workpiece surface can be increased, the processing time of each point of material on the workpiece surface can be increased, and a large amount of material that is difficult to cut in shaft parts can be removed.

[0027] (2) The rotary drive disc structure composed of end face gear and spiral guide rail can realize the synchronous adjustment of multiple electrodes under the drive of motor, ensuring that the processing gap between all electrodes and workpiece is consistent, the processing accuracy is high, and it can adapt to the electrolytic turning of shaft parts with different diameters, with a wide processing range.

[0028] (3) By adopting the pressure sensor feedback adjustment method, the machining gap on the workpiece surface can be precisely adjusted, avoiding system errors caused by manual adjustment, improving machining accuracy, and shortening the time required for machining gap adjustment, thus improving overall operating efficiency.

[0029] (4) The tightening tool electrode internal cavity structure design can increase the electrolyte pressure at the tool electrode outlet, increase the electrolyte flow rate at the tool electrode outlet, promote the timely removal of processed products, and improve the surface processing quality of shaft parts.

[0030] (5) By adopting a high-potential, rapid, and repeated back-and-forth processing method, the surface quality of the workpiece under a single processing can be improved, the genetic error under multiple processing can be reduced, and the processing accuracy of the workpiece surface material with a large allowance can be improved. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the processing device of the present invention.

[0032] Figure 2 This is a schematic diagram of the structure of the multi-electrode device of the present invention.

[0033] Figure 3 This is a partial cross-sectional view of the structure of the multi-electrode device of the present invention.

[0034] Figure 4 for Figure 3 Sectional view of AA.

[0035] Figure 5 for Figure 3 BB section view.

[0036] Figure 6 This is a schematic diagram of the overall structure of the tool electrode head in this invention.

[0037] Figure 7 This is a schematic diagram of the processing gap adjustment stage of the processing device in this invention.

[0038] Figure 8 This is a schematic diagram of the processing gap of the processing device in this invention. Figure 9This is a schematic diagram of the initial processing position structure of the processing device of the present invention.

[0039] Figure 10 This is a top view of the initial processing position of the processing device of the present invention.

[0040] Figure 11 This is a schematic diagram of the processing device of the present invention during the processing process.

[0041] Figure 12 This is a cross-sectional view of the processing device of the present invention during the processing process.

[0042] Figure 13 This is a schematic diagram of the structure after the processing gap is adjusted after a single processing step in this invention.

[0043] Figure 14 This is a schematic diagram of the reverse processing process of the processing device of the present invention.

[0044] Figure 15 This is a cross-sectional view of the reverse processing process of the processing device of the present invention.

[0045] Figure 16 This is a schematic diagram of the structure after the tool is retracted following multiple processing steps in this invention.

[0046] Figure 17 This is a top view of the tool after retracting the tool following multiple processing steps in this invention. Detailed Implementation

[0047] like Figures 1 to 5 As shown, this embodiment of an adjustable multi-electrode electrolytic turning apparatus includes a rotary drive device for rotating a workpiece 5, a multi-electrode device 1, and a moving drive device for moving the multi-electrode device. The workpiece 5 is inserted into the central machining area of ​​the multi-electrode device 1. In this embodiment, the moving drive device adopts an XYZ movable support arm 4. The upper end face of the multi-electrode device 1 is connected to the XYZ movable support arm 4 through a connecting frame 3. The XYZ movable support arm 4 can drive the multi-electrode device 1 to make axial feed on the surface of the workpiece 5 under the drive of an external servo motor. The rotary drive device includes a three-jaw chuck 6. The workpiece 5 is fixed on the spindle 7 by the three-jaw chuck 6. The spindle 7 can drive the workpiece 5 to rotate under the drive of an external servo motor. The electrolyte 9 is continuously supplied to the tool electrode head 11 of the multi-electrode device 1 through a metal hose 2 under the action of an external pressure pump and is sprayed onto the surface of the workpiece 5. The multi-electrode device 1 is connected to the negative terminal of the power supply 8, and the workpiece 5 is connected to the positive terminal of the power supply 8. Under electrochemical action, a large amount of material can be removed from the surface of the workpiece 5.

[0048] The multi-electrode device 1 includes an annular base, an adjustment device, and several tool electrode heads 11. The tool electrode heads are used to spray electrolyte onto the surface of the workpiece 5. The annular base is provided with a circumferential annular groove and a radial linear groove. The annular base includes an upper end cover 13 and a lower end cover 12. The upper end face of the lower end cover 12 is provided with a stepped surface, which includes a first end face and a second end face. The upper end cover 13 contacts the first end face. An annular groove is formed between the lower end face and the second end face of the upper end cover 13. The upper end cover 13 and the lower end cover 12 are axially limited by fastening screws 17.

[0049] The adjusting device includes a rotary drive disk rotating within an annular groove, a first drive device for rotating the drive disk 14, and several sliders moving along a linear groove. The first drive device includes a first drive motor 16 fixed to an annular base, a drive gear fixed to the output shaft of the first drive motor 16, and lower end face teeth 141 provided on the lower surface of the disk 14. A spiral guide rail 142 is provided on the upper surface of the disk 14, and teeth 191 are provided on the lower surface of the slider 19. The teeth on the lower surface of the slider 19 cooperate with the spiral guide rail. The annular edge of the disk 14 is provided with... Between the lower end face 132 of the upper end cover 13 and the second end face 122 of the lower end cover 12, on the one hand, a first drive motor 16 is provided on the left plane 121 of the lower end cover 12. The main shaft end of the first drive motor 16 passes through the left circular hole of the lower end cover 12 and is fixed to the drive gear 15. At the same time, the drive gear 15 meshes with the teeth 141 on the lower end face of the rotary drive disk 14. The drive gear 15 can drive the rotary drive disk to rotate through the first drive motor 16. On the other hand, at least two pairs of rectangular crosshairs are provided on the upper end cover 13. A linear groove 133 is provided, within which a movable slider 19 is provided. The two side grooves 192 of the slider 19 are inserted into the convex guide rails 131 distributed on both sides of the linear groove 133. The bottom teeth 191 of the slider 19 engage with the spiral guide rail 142 on the upper end face of the disc 14. Simultaneously, a pressure sensor 18 is connected to the top of the slider 19, and a tool electrode head 11 is connected to the top of the pressure sensor 18. The slider 19 can drive the tool electrode head 11 to move radially within the linear groove 133 through the rotation of the disc 14. When the tool electrode head 11 touches the surface of the workpiece 5, the pressure sensor 18 can obtain a pressure signal and provide timely feedback. Under the radial force control feedback of the pressure sensor 18, the machining gap between the arc end face 112 of the tool electrode head 11 and the surface of the workpiece 5 can be adjusted quickly and accurately, avoiding system errors caused by manual adjustment, improving machining accuracy, and shortening the time required for machining gap adjustment, thus improving overall operating efficiency. It is also applicable to the adjustment of the machining gap between the workpiece 5 and the tool electrode head 11 with different diameters, and has a wide machining range.

[0050] At least two pairs of tool electrode heads 11 are arranged facing each other, which can increase the contact area between the tool electrode head 11 and the surface of the workpiece 5, increase the processing time at each point on the workpiece surface, and realize the removal of a large amount of difficult-to-cut material in shaft parts. In this embodiment, four tool electrode heads are evenly arranged around the circumference of the disk 14. At the same time, the tool electrode head 11 is provided with an arc-shaped end face 112. Its arc surface structure design can reduce the average processing gap between the electrode end face and the workpiece surface, further improving the removal of material from the workpiece surface. In addition, the tool electrode head 11 is provided with a tightening cavity 111. Its funnel-shaped liquid outlet can increase the electrolyte pressure at the tool electrode outlet, increase the electrolyte flow rate at the tool electrode outlet, promote the timely removal of processed products, and improve the surface processing quality of shaft parts. Furthermore, the tail of the tool electrode head 11 is provided with a liquid inlet 113 connected to the metal hose 2, which can continuously supply liquid to the tool electrode head 11 under the action of an external pressure pump.

[0051] like Figures 7 to 17 As shown, an adjustable multi-electrode electrolytic turning method includes the following steps:

[0052] Step 1: Control the XYZ movable support arm 4 with an external servo motor to insert the workpiece 5 into the multi-electrode device 1. The tool electrode head surrounds the outer periphery of the workpiece, while ensuring that the axis of the multi-electrode device 1 coincides with that of the workpiece 5.

[0053] Step 2: The first drive motor 16 controls the arc-shaped end face 112 of the tool electrode head 11 to approach the surface of the workpiece 5. When the pressure sensor 18 recognizes and feeds back a signal, the arc-shaped end face 112 contacts the surface of the workpiece 5, and then quickly controls the first drive motor 16 to rotate in the opposite direction, so that the tool electrode head moves away from the workpiece. The initial processing gap d between the arc-shaped end face 112 of the tool electrode head 11 and the surface of the workpiece 5 can be precisely adjusted. The range of the initial processing gap d is generally 0.2~0.6mm. If the initial processing gap is too large, it will lead to a reduction in the processing current and affect the efficient removal of material from the surface of the workpiece 5.

[0054] Step 3: The XYZ movable support arm 4 is controlled by an external servo motor to move the multi-electrode device 1 to the initial processing position, so that the front end of the tool electrode head 11 is outside the end of the workpiece 5 and close to the end of the workpiece 5, so that the tool electrode head 11 can enter the processing area as soon as possible during the processing, avoid idling and improve processing efficiency.

[0055] Step 4: Control the spindle 7 to rotate via an external servo motor, and adjust the rotation speed of the workpiece 5 to n. The rotation speed n is generally 300~700 r / min. If the rotation speed is too high or too low, it will affect the timely removal of the passivation film on the workpiece surface, and thus affect the uniform dissolution of the workpiece surface material. Supply electrolyte to the multi-electrode device and turn on the power supply 8. Apply a high potential U between the tool electrode head 11 and the workpiece 5. The potential U is generally 70~80V. Avoid the reduction of processing current due to the potential being too low, which will affect the efficient removal of the workpiece surface material. Also, the potential being too low will easily lead to a reduction in current density, which is not conducive to the uniform dissolution of the workpiece surface material.

[0056] Step 5: Adjust the feed speed of the tool electrode head 11 in the Y direction to v. The feed speed v is generally 50~100mm / min. Using a large feed speed can reduce the secondary corrosion of the machined surface by the small current density area at the tail end of the electrode, and improve the surface machining quality. At the same time, set the feed stroke to L.

[0057] Step 6: After a single feed is completed, a cylindrical surface with a single-sided cutting depth of t can be obtained. Turn off the power supply 8, turn off the external pressure pump to stop the liquid supply, and turn off the external servo motor to stop the spindle rotation. Quickly adjust the initial processing gap between the arc end face 112 of the tool electrode head 11 and the surface of the workpiece 5 to d through the pressure sensor 18 and the first drive motor 16 to ensure that the amount of material removed in each processing is consistent.

[0058] Step 7: Drive the workpiece to rotate, supply electrolyte to the multi-electrode device, apply potential between the tool electrode head and the workpiece, and move the drive device to drive the multi-electrode device to move outward along the workpiece.

[0059] Step 8: Repeat steps 4 to 7, where the feed speed direction in step 7 is set to be opposite to that in step 5. High-potential, rapid back-and-forth machining can improve the surface quality in a single machining operation, reduce the inherited error in multiple machining operations, and improve the machining accuracy of large allowances of material on the workpiece surface. Until the single-sided machining depth of the cylindrical workpiece reaches the specified machining depth T, turn off the power supply 8 to stop power supply, turn off the external pressure pump to stop liquid supply, and turn off the external servo motor to stop the spindle rotation. Then, use the external servo motor to control the XYZ movable support arm 4 to move the multi-electrode device 1 out of the machining area, remove the workpiece 5, and the machining is complete.

Claims

1. An adjustable multi-electrode electrolytic turning apparatus, characterized in that, The device includes a rotary drive for rotating the workpiece (5), a multi-electrode device (1), and a moving drive for moving the multi-electrode device. The multi-electrode device (1) includes an annular base, an adjustment device, and several tool electrode heads (11). The tool electrode heads are used to spray electrolyte onto the surface of the workpiece (5). The annular base is provided with a circumferential annular groove and a radial linear groove (133). The adjustment device includes a disc (14) that rotates within the annular groove, a first drive for rotating the disc (14), and several sliders (19) that move along the linear groove. The upper surface of the slider (19) is provided with a spiral guide rail (142), and the lower surface of the slider (19) is provided with teeth (191). The teeth on the lower surface of the slider cooperate with the spiral guide rail. When the first driving device drives the disc (14) to rotate, the slider slides along the straight groove under the drive of the spiral guide rail. The slider (19) is fixed by a pressure sensor (18) and a tool electrode head (11). The movement of the slider (19) drives the tool electrode head (11) to move, thereby making the tool electrode head (11) closer to or away from the workpiece. The pressure sensor (18) is used to sense the pressure signal when the tool electrode head (11) contacts the workpiece.

2. The adjustable multi-electrode electrolytic turning apparatus according to claim 1, characterized in that, The tool electrode head (11) includes a tightening cavity (111) for spraying electrolyte. One end of the tightening cavity (111) is provided with an inlet and the other end is provided with an outlet. The inlet is used to connect to a hose (2) that supplies electrolyte. The cross-sectional area of ​​the outlet gradually decreases along the outlet direction.

3. The adjustable multi-electrode electrolytic turning apparatus according to claim 2, characterized in that, The tool electrode head (11) has an arc-shaped end face (112) near the workpiece, and the arc-shaped end face adopts an arc surface structure that matches the workpiece surface.

4. The adjustable multi-electrode electrolytic turning apparatus according to claim 3, characterized in that, The first driving device includes a first driving motor (16) fixed on an annular base, a drive gear fixed on the output shaft of the first driving motor (16), and a lower end face tooth (141) disposed on the lower surface of the disk (14). The drive gear meshes with the lower end face tooth (141), the first driving motor (16) drives the drive gear to rotate, and the drive gear (15) drives the disk (14) to rotate.

5. The adjustable multi-electrode electrolytic turning apparatus according to claim 1, characterized in that, The annular base includes an upper end cover (13) and a lower end cover (12). The upper end face of the lower end cover (12) is provided with a stepped surface, which includes a first end face and a second end face. The upper end cover (13) is in contact with the first end face, and an annular groove is formed between the lower end face of the upper end cover (13) and the second end face.

6. The adjustable multi-electrode electrolytic turning apparatus according to claim 5, characterized in that, The linear slide groove (133) is provided on the upper end cover (13). The linear slide groove (133) has raised convex slide rails (131) on both sides. The slider (19) has grooves (192) on both sides corresponding to the convex slide rails (131). The convex slide rails (131) are inserted into the grooves (192).

7. The adjustable multi-electrode electrolytic turning apparatus according to claim 1, characterized in that, The multi-electrode device (1) includes four tool electrode heads (11), which are evenly distributed circumferentially on the annular base.

8. A machining method of the adjustable multi-electrode electrolytic turning apparatus according to claim 1, characterized in that, Includes the following steps: Step 1: Install the workpiece on the rotary drive device, and drive the multi-electrode device through the moving drive device so that the tool electrode head surrounds the outer periphery of the workpiece, and the multi-electrode device is coaxial with the workpiece. Step 2: Move the tool electrode head closer to the workpiece using the first driving device; Step 3: The recognition signal of the pressure sensor is detected. At this time, the tool electrode head is in contact with the workpiece surface. The first driving device is controlled to move the tool electrode head away from the workpiece to a preset distance. Step 4: Drive the multi-electrode device to the initial processing position using the moving drive device; Step 5: The rotary drive device drives the workpiece to rotate, supplies electrolyte to the multi-electrode device, and applies potential between the tool electrode head and the workpiece; Step 6: The moving drive device drives the multi-electrode device to feed along the workpiece; Step 7: After a single feed is completed, turn off the potential applied between the tool electrode head and the workpiece, turn off the electrolyte supply, stop the workpiece rotation, and move the tool electrode head closer to the workpiece by the first drive device; After detecting the recognition signal from the pressure sensor, the first drive device is controlled to move the tool electrode head away from the workpiece to a preset distance. Step 8: The rotary drive device drives the workpiece to rotate, supplies electrolyte to the multi-electrode device, and applies potential between the tool electrode head and the workpiece. The moving drive device drives the multi-electrode device to move outward along the workpiece. Step 9: Repeat steps 5 to 8 to process the workpiece back and forth multiple times until the workpiece meets the processing requirements. Then, turn off the potential applied between the tool electrode head and the workpiece, turn off the electrolyte supply, stop the workpiece rotation, and move the multi-electrode device out of the processing area using the moving drive device.

9. The processing method according to claim 8, characterized in that, The preset distance ranges from 0.2 to 0.6 mm.

10. The processing method according to claim 8, characterized in that, The potential applied between the tool electrode head and the workpiece is in the range of 70~80V.

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