CN115846778A - Discharge electrochemical-grinding sequential circulation combined machining tool electrode and machining method - Google Patents

Abstract

The invention relates to a discharge electrochemical-grinding sequence cycle compound processing tool electrode and a processing method, belonging to the field of compound processing. The present invention proposes a discharge-electrochemical compound synergistic grinding processing method, discharge-electrochemical action and grinding action alternately act on the workpiece material, and the processing sequence is sequentially discharge electrochemical rough machining, grinding rough machining, and discharge electrochemical finish machining , Grinding and finishing, realize the efficient and precise machining of the workpiece surface, avoid the machining error caused by the replacement of the tool electrode, and at the same time couple the movement of the tool electrode with the pulse power application method and pulse power parameters to avoid the loss of reactive power The output improves the energy utilization rate, which is beneficial to obtain higher processing efficiency. At the same time, the tool electrode adopts a combined clamping method, different electrode parts can be assembled and disassembled, and the electrode body does not need to be replaced, which reduces the processing cost.

Description

Discharge Electrochemistry-Grinding Sequential Cycle Composite Machining Tool Electrode and Processing Method

technical field

The invention relates to a discharge electrochemical-grinding sequential cycle compound processing tool electrode and a processing method, belonging to the field of compound processing.

Background technique

With the development of the aerospace industry, the demand for aerospace structural parts of difficult-to-machine materials such as high-temperature alloys, titanium alloys, and composite materials is increasing. For example, dozens of components such as the Chinese Mars rover "Zhu Rong" body load-bearing structure, mechanical movement mechanism, and detector structure use a variety of SiC _p / with different silicon carbide contents, and the wings, central wing, and fuselage of the C919 aircraft The skins, etc. are all made of titanium alloy materials, and the F110, F404 and F414 engines are made of Hastelloy X nickel-based superalloy. However, when such difficult-to-machine materials are processed by traditional mechanical cutting methods, there are defects such as low processing efficiency, severe tool wear, and poor surface quality, which limit the further promotion and application of difficult-to-machine materials in the aerospace field.

EDM is based on the electro-corrosion phenomenon generated during the spark discharge between the tool electrode and the workpiece to etch the workpiece material. It has the characteristics of high processing efficiency and no macroscopic cutting force. Only when the processing gap reaches tens of microns, spark discharge will occur in the processing gap, and a large amount of spark discharge products will be generated during the processing process, and a large amount of spark discharge products will accumulate in the processing gap, resulting in the working fluid in the gap not being able to quickly return to the original state The dielectric state affects the stable progress of spark discharge and reduces the efficiency of electric discharge machining and the surface quality of the workpiece.

Electrolytic machining is based on the principle of electrochemical anodic dissolution to realize the forming process of workpiece materials. It has the characteristics of high surface quality and no residual stress on the surface. However, compared with electrical discharge machining, the material removal rate of electrolytic machining is lower, only up to hundreds of mm ³ /min, which is difficult to meet the manufacturing requirements for efficient machining of large structural parts; compared with grinding, electrolytic machining has serious surface problems. The stray corrosion and poor processing localization cannot guarantee high processing accuracy.

Grinding is to use the micro-abrasive particles in the grinding wheel to micro-cut the surface of the workpiece to remove the material of the workpiece. Grinding has the characteristics of high processing precision and good surface quality. Grinding is a finishing process, which is usually used as the final stage of parts processing. Therefore, the machining allowance of grinding is very small, and the material removal rate of grinding is very low, which cannot meet the manufacturing requirements of efficient machining of large structural parts.

Therefore, in order to meet the rapid development of the aerospace field and meet the high-efficiency and precision manufacturing requirements of difficult-to-machine material components, innovative processing methods that take into account both processing efficiency and surface quality are urgently needed.

Contents of the invention

In order to obtain higher processing efficiency and better surface quality, the present invention proposes a discharge electrochemical-grinding sequential cycle compound processing tool electrode and processing method, which couples the workpiece electrode structure, tool electrode movement and pulse power application mode , Combining discharge-electrochemical action and grinding action in situ to achieve efficient and precise processing.

A discharge electrochemical-grinding sequential cycle compound processing tool electrode is characterized in that: the tool electrode is a hollow rotating body electrode, including a discharge-electrochemical roughing electrode, a rough grinding sheet, and a discharge-electrochemical finishing electrode , fine grinding sheet and tool electrode body, the radii of each part are R ₁ , R ₂ , R ₃ , R ₄ and R ₀ , and the radius relationship is R ₀ < R ₃ < R ₁ < R ₄ < R ₂ ; The corresponding central angles of discharge-electrochemical roughing electrode, rough grinding sheet, discharge-electrochemical finishing electrode and fine grinding sheet are β ₁ , β ₂ , β ₃ and β ₄ respectively, and the corresponding central angles of each part are less than It is equal to 90 degrees, and the corresponding central angle is adjustable.

The processing method using the above-mentioned tool electrode is characterized in that it includes the following process: Step 1: The cycle of the tool electrode rotating one circle around the axis is T ₀ , and within one cycle T ₀ , discharge-electrochemical rough machining electrodes, rough grinding sheets, The discharge-electrochemical finishing electrode and the fine grinding sheet act alternately in sequence. The whole processing process is divided into four stages, namely, the discharge-electrochemical rough machining stage, the rough grinding stage, the discharge-electrochemical finishing stage, and the fine grinding stage. cutting stage. In one cycle T ₀ , the action time of discharge-electrochemical rough machining stage, rough grinding stage, discharge-electrochemical finishing stage and fine grinding stage is t _a , t _b , t _c , t _d , respectively. In the first 1/2T ₀ period of tool electrode movement, the pulse power supply sends out a pulse voltage with long pulse width and small amplitude, and the pulse width T _{1_on} and pulse interval T _{1_off} and the tool electrode rotation period T ₀ conform to the expression T _{1_on} +T _{1_off} ≤1/2T ₀ ; in the last 1/2T ₀ cycle of the tool electrode movement, the pulse power supply sends out a pulse voltage with a short pulse width and a large value, and the pulse width T _{2_on} and pulse interval T _{2_off} of the pulse voltage are consistent with the tool electrode The rotation period T ₀ conforms to the expression T _{2_on} + T _{2_off} ≤ 1/2T ₀ , and conforms to the expression T _{2_on} < T _{1_on} , and the long pulse width pulse voltage amplitude U ₁ is smaller than the short pulse width pulse voltage amplitude U ₂ ; Step 2: The workpiece is connected to the positive pole of the pulse power supply, and the tool electrode is connected to the negative pole of the pulse power supply. At the same time, the tool electrode rotates counterclockwise at a high speed according to the preset rotation direction, and the tool electrode is fed in the direction close to the workpiece along the preset feed direction, and the working fluid is supplied by the tool. The liquid is sprayed out from the side wall of the electrode and enters the machining gap between the tool electrode and the workpiece; Step 3: In the discharge-electrochemical roughing stage, the tool electrode rotates 1/4 turn around the axis, and the discharge electrochemical roughing electrodes all enter the processing At the same time, the pulse power supply sends out multiple pulse voltages with long pulse width and small amplitude, and multiple high-energy spark discharges and violent electrochemical dissolution reactions are generated between the discharge electrochemical roughing electrode and the workpiece, resulting in A large number of processing products and hydrogen bubbles; the fine grinding sheet has a grinding effect on the surface after discharge electrochemical finishing, and grinding products are produced in the processing area to achieve the effect of trimming the surface of the workpiece; Step 4: In the rough grinding stage, the tool electrode Continue to rotate around the axis for 1/4 turn, all the coarse grinding pieces in the tool electrode rotate into the processing area, and start to grind the surface processed by the discharge electrochemical roughing electrode, producing a large number of grinding products; at the same time, the pulse power continues to emit With long pulse width and small amplitude pulse voltage, multiple high-energy spark discharges are generated in the gap between the discharge electrochemical roughing electrode and the workpiece, and a large number of workpiece materials are rapidly eroded by spark discharge and electrochemical dissolution; step five: in In the discharge-electrochemical finishing stage, the tool electrode continues to go through 1/4 turn around the axis, and all the discharge-electrochemical finishing electrodes in the tool electrode enter the processing area. At the same time, the pulse power supply sends out multiple pulse voltages with short pulse width and large value. , multiple low-energy spark discharges and weak electrochemical dissolution reactions occur between the discharge-electrochemical finishing electrode and the workpiece, resulting in a small amount of processed products and hydrogen bubbles; Grinding occurs on the surface, and a large amount of grinding products are produced in the processing area, so as to achieve the effect of removing workpiece material with a large margin and repairing the surface of the workpiece; Step 6: In the stage of fine grinding, the tool electrode continues to pass 1/4 turn around the axis, and the tool electrode The medium-finishing grinding pieces all rotate into the processing area, and start to grind the surface of the workpiece processed by the discharge-electrochemical finishing electrode to achieve the effect of trimming the surface of the workpiece; at the same time, the pulse power supply continues to send out multiple short pulse widths, large The pulse voltage of the value, discharge-electrochemical roughing electrode and workpiece processing gap produces multiple low-energy spark discharges, and the workpiece material is eroded by low-energy spark discharges and electrochemical dissolution; Step 7: With the tool electrode Continuously feed and repeat the above steps three to six, under the intermittent spark discharge, electrolysis and grinding, the efficient and precise machining of the workpiece material is realized.

Compared with single electric discharge machining, electrolytic machining or grinding, the discharge electrochemical-grinding sequential cycle compound machining tool electrode and machining method proposed by the present invention can use the same tool to efficiently rough and finish the workpiece, The high-efficiency precision machining of the workpiece material is realized, the positioning error caused by the replacement of the tool electrode is avoided, and the machining accuracy and machining efficiency of the workpiece are improved. Different processing effects can be obtained by adjusting the corresponding central angles of the discharge-electrochemical composite machining roughing and finishing electrodes and the grinding roughing and finishing grinding heads. Increase the central angle corresponding to the rough machining electrode and the rough grinding sheet of the discharge-electrochemical composite machining to obtain higher processing efficiency; increase the corresponding central angle of the finishing electrode and the fine grinding sheet of the discharge electrochemical composite machining to obtain better surface quality. Discharge electrochemical-grinding sequential cycle compound processing tool electrode includes discharge electrochemical rough machining electrode, discharge electrochemical finishing electrode, rough grinding sheet and fine grinding sheet. The tool electrode body and each electrode are connected by bolts. Finally, the used discharge-electrochemical composite machining electrode can be disassembled and replaced, which is conducive to the realization of low-cost, high-efficiency, high-quality rough-finish integrated machining. Coupling the movement of the tool electrode with the application of the pulse power supply, in different processing stages, the pulse power supply emits different types of pulse voltages, which reduces the power requirements of the pulse power supply, improves the utilization efficiency of the power supply, and avoids the output of invalid energy.

The discharge electrochemical-grinding sequential cycle compound processing tool electrode and processing method are characterized in that: the material of the tool electrode body is stainless steel, the discharge-electrochemical rough machining electrode and the discharge-electrochemical finishing electrode are made of graphite or Copper-tungsten alloy or red copper, rough grinding sheet and fine grinding sheet (13) base material is resin base or ceramic base material, and the abrasive grain material of reinforcement phase is diamond, CBN, SiC, Al ₂ O ₃ abrasive material, rough grinding The grain size of the coarse abrasive in the chip is 40# to 280#, and the grain size of the fine abrasive in the fine grinding chip is 400# to 1500#; and the workpiece material is titanium alloy or superalloy or stainless steel or metal matrix composite material. The abrasives of different meshes used for the rough grinding sheet and the fine grinding sheet can more efficiently realize the rough machining and finishing machining of the processing area, improve the processing efficiency and improve the surface quality.

The discharge electrochemical-grinding sequential cycle compound processing tool electrode and processing method are characterized in that: the working fluid is sodium nitrate or sodium chloride solution, and the concentration is not lower than 5%.

Using a higher concentration of salt solution, there will be a large number of bubbles in the process of processing, which will aggregate and form a gas film, resulting in spark discharge; at the same time, the use of a high concentration of salt solution will help increase the electrolytic machining current and increase the material removal rate.

The discharge electrochemical-grinding sequential cycle compound processing tool electrode and the processing method are characterized in that the diameter of the bottom area of the tool electrode body is 15-60 mm.

The discharge electrochemical-grinding sequence cycle compound processing tool electrode and processing method are characterized in that: the long pulse width, small amplitude pulse voltage is 10V-40V, the pulse width is 500us-10ms, the short pulse width, large value The pulse voltage is 40V-120V, and the pulse width is 10us-300us.

When the discharge-electrochemical composite machining roughing electrode cuts into the processing area, the pulse power supply sends out pulses with a pulse voltage of 10V-40V and a pulse width of 500us-10ms, and multiple high-energy spark discharges are generated in the processing area, and electrochemical dissolution It is also more intense, providing sufficient energy input for processing and removing materials; when the discharge electrochemical composite machining finishing electrode cuts into the processing area, the pulse power supply sends out multiple pulses with a pulse voltage of 40V-120V and a pulse width of 10us-300us. Multiple small-energy spark discharges occur in the area, and the electrochemical dissolution is weak, which achieves the effect of trimming the surface quality of the workpiece after rough machining. At the same time, under the impact of the spark discharge channel, the processing products generated in the rough machining stage in the processing area are eliminated. , which is conducive to improving the processing efficiency.

Description of drawings

Fig. 1 is a schematic diagram of the starting position of the discharge-electrochemical composite rough machining proposed by the present invention;

Fig. 2 is a schematic diagram of the starting position of the rough grinding of the cut-in discharge-electrochemical composite cooperative grinding process proposed by the present invention;

Fig. 3 is a schematic diagram of the starting position of the discharge-electrochemical composite finishing process proposed by the present invention;

Fig. 4 is a schematic diagram of the starting position of the fine grinding of the cut-in discharge-electrochemical composite cooperative grinding process proposed by the present invention;

Fig. 5 is a schematic cross-sectional view of an electrode of a cutting-in discharge-electrochemical composite collaborative grinding tool;

Fig. 6 is a schematic diagram of the coupling of tool electrode rotational motion and pulse application mode;

Fig. 7 is a three-dimensional schematic diagram of the electrode of the cutting-in discharge-electrochemical composite grinding tool;

The label names in the figure are: 1. Discharge electrochemical rough machining electrode; 2. Working fluid; 3. Processed product; 4. Coarse abrasive grain; 5. Pulse power supply; Electrode; 8. Grinding product; 9. Spark discharge; 10. Work piece; 11. Tool electrode body; 12. Fine abrasive grain; 13. Fine grinding piece; 14. Rotation direction; 15. Hydrogen bubble; direction; 17, liquid outlet seam.

Detailed ways

The present invention will be further described in detail below in conjunction with specific drawings.

Fig. 1 is a schematic diagram of the starting position of the electric discharge-electrochemical composite rough machining of the cut-in type discharge-electrochemical composite cooperative grinding. The tool electrode 11 rotates counterclockwise at a high speed according to the preset rotation direction 14, and feeds at a constant speed along the feed direction 16. The 1/2 section of the discharge-electrochemical roughing electrode 1 rotates into the processing area, and the pulse power supply 5 starts to send out multiple Pulse voltage with long pulse width and small amplitude, because the discharge-electrochemical roughing electrode 1 radius R ₁ is greater than the discharge-electrochemical finishing electrode 7 radius R ₃ , so the gap between the discharge-electrochemical roughing electrode 1 and the workpiece 10 The inter-electrode machining gap is smaller than the machining gap between the discharge-electrochemical finishing electrode 7 and the workpiece 10, so the spark discharge 9 generated between the discharge-electrochemical roughing electrode 1 and the workpiece 10 has greater energy and electrochemical dissolution The effect is stronger; with the feeding of the tool electrode 11, the fine grinding sheet 13 finishes the surface after the discharge-electrochemical finishing electrode 7 is processed, removes the surface defect layer, and improves the surface quality of the workpiece 10;

Fig. 2 is a schematic diagram of the starting position of the rough grinding in the plunge-cut discharge-electrochemical compound cooperative grinding process. The tool electrode 11 rotates counterclockwise at high speed according to the preset rotation direction 14, and feeds at a constant speed along the feed direction 16, and the 1/2 segment of the rough grinding sheet 6 rotates into the processing area, and starts to discharge-electrochemical roughing electrode 1 The surface of the processed workpiece 10 is trimmed to remove the surface defect layer; the pulse power supply 5 continues to send out multiple pulse voltages with long pulse widths and small amplitudes, and discharge-severe spark discharge 9 is generated between the electrochemical roughing electrode 1 and the workpiece 10 React with electrochemical dissolution to efficiently remove workpiece materials;

Fig. 3 is a schematic diagram of the start position of discharge-electrochemical composite finishing in the plunge-cut discharge-electrochemical composite grinding process. The tool electrode 11 rotates counterclockwise at a high speed according to the preset rotation direction 14, and feeds at a constant speed along the feed direction 16, and the 1/2 segment rotation of the discharge-electrochemical finishing electrode 7 enters the processing area, and the pulse power supply 5 starts to send out multiple Pulse voltage with short pulse width and large value, because the discharge-electrochemical finishing electrode 7 radius _R3 is smaller than the discharge-electrochemical roughing electrode 1 radius _R1 , so the distance between the discharge-electrochemical finishing electrode 7 and the workpiece 10 The inter-electrode machining gap is larger than the machining gap between the discharge-electrochemical roughing electrode 1 and the workpiece 10, so the spark discharge 9 generated between the discharge-electrochemical finishing electrode 7 and the workpiece 10 has less energy and electrochemical dissolution Weaker, only play the effect of improving surface quality; The rough abrasive grain 4 in the rough grinding sheet 6 contacts with workpiece 10 material, removes the surface defect layer and matrix material after the discharge-electrochemical rough machining electrode 1 processes, improves machining efficiency.

Fig. 4 is a schematic diagram of the starting position of fine grinding in the plunge-cut discharge-electrochemical compound cooperative grinding process. The tool electrode 11 rotates counterclockwise at high speed according to the preset rotation direction 14, and feeds at a constant speed along the feed direction 16. The pulse power supply 5 continues to send out multiple pulse voltages with short pulse width and large value, and the discharge-electrochemical finishing electrode 7 The spark discharge 9 and the electrochemical dissolution reaction generated between the workpiece 10 are weak, improving the surface quality of the machined surface; the 1/2 section of the fine grinding sheet 13 rotates into the processing area, and begins to process the discharge-electrochemical fine electrode 7 Finishing of workpiece surface to improve surface quality;

Fig. 5 is a schematic cross-sectional view of an electrode of a cutting-in electric discharge-electrochemical composite grinding tool. The radii of discharge-electrochemical roughing electrode 1, discharge-electrochemical finishing electrode 7, rough grinding sheet 6, fine grinding sheet 13 and tool electrode 11 are R ₁ , R ₃ , R ₂ , R ₄ and R ₀ , and there is a relationship between the radii of each part R ₀ <R ₃ <R ₁ <R ₄ <R ₂ , the radius difference is 0.1mm-0.5mm; discharge-electrochemical rough machining electrode 1, rough grinding sheet 6, The corresponding central angles of discharge-electrochemical finishing electrode 7 and fine grinding sheet 13 are β ₁ , β ₂ , β ₃ and β ₄ respectively. By adjusting the corresponding central angles of each part, the action time of different electrodes or grinding sheets can be controlled. Obtain different processing effects, increasing β ₁ and β ₂ can obtain higher processing efficiency, increasing β ₃ and β ₄ can obtain better surface quality;

Fig. 6 is a schematic diagram of the coupling of tool electrode rotational movement and pulse application. The rotation period of the tool electrode 11 is T ₀ , and t _a =t _b =t _c =t _d =1/4T ₀ , the rotation period of the tool electrode 11 ranges from tens of milliseconds to hundreds of milliseconds; long pulse width, small amplitude The pulse width T _{1_on} and pulse interval T _{1_off} of the value pulse voltage and the rotation period T ₀ of the tool electrode 11 conform to the expression T _{1_on} + T _{1_off} ≤ 1/2T ₀ , and the value of T _{1_on} ranges from several milliseconds to tens of milliseconds; short The pulse width, pulse width T _{2_on} and pulse interval T _{2_off} of the large-value pulse voltage and the tool electrode rotation period T ₀ conform to the expression T _{1_on} + T _{1_off} ≤ 1/2T ₀ , and conform to the expression T _{2_on} < T _{1_on} , The value of T _{2_on} ranges from a few microseconds to tens of microseconds; the long pulse width pulse voltage amplitude U ₁ is smaller than the short pulse width pulse voltage amplitude U ₂ , and the long pulse width pulse voltage amplitude U ₁ is 20-70V, and U ₁ amplitude is less than U ₂ amplitude 20-70V.

Fig. 7 is a three-dimensional schematic diagram of a tool electrode for cutting-in discharge-electrochemical composite collaborative grinding. The discharge-electrochemical composite collaborative grinding tool electrode is composed of discharge-electrochemical roughing electrode 1, discharge-electrochemical finishing electrode 7, rough grinding sheet 6, fine grinding sheet 13 and tool electrode 11 body, and each The electrode is embedded in the body of the tool electrode 11 through bolt connection, the body of the tool electrode 11 is provided with a working fluid 2 flow channel, and a liquid outlet slit 17 is provided at the bottom.

The in-situ high-efficiency precision machining method proposed by the present invention expands the application range of electric discharge-electrochemical composite grinding technology, but the above description cannot be understood as a limitation of the patent of the present invention. It should be noted that, on the premise of not departing from the concept of the present invention, several improvements can be made, and these should fall under the protection of the patent of the present invention.

Claims (6)

1. A discharge electrochemical-grinding sequence cycle composite processing tool electrode, characterized in that: The tool electrode (11) is a hollow rotating body electrode, including a discharge-electrochemical roughing electrode (1), a rough grinding sheet (6), a discharge-electrochemical finishing electrode (7), and a fine grinding sheet (13 ) and the tool electrode (11) body; The radii of each part are R ₁ , R ₂ , R ₃ , R ₄ and R ₀ respectively, and the radius relationship is R ₀ <R ₃ <R ₁ <R ₄ <R ₂ ; The corresponding central angles of discharge-electrochemical roughing electrode (1), rough grinding sheet (6), discharge-electrochemical finishing electrode (7), and fine grinding sheet (13) are β ₁ , β ₂ , and β ₃ respectively and β ₄ , the corresponding central angles of each part are less than or equal to 90 degrees, and the corresponding central angles are adjustable. 2. Utilize the processing method of the described tool electrode of claim 1, it is characterized in that comprising the following steps: Step 1: The cycle of the tool electrode (11) rotating around the axis for one revolution is T ₀ , and within one cycle T ₀ , the discharge-electrochemical roughing electrode (1), rough grinding sheet (6), discharge-electrochemical finishing The electrode (7) and the fine grinding sheet (13) act alternately in sequence, and the whole processing process is divided into four stages, namely, the discharge-electrochemical rough machining stage, the rough grinding stage, the discharge-electrochemical finishing stage, and the fine grinding stage. grinding stage; in one cycle T ₀ , the action time of discharge-electrochemical rough machining stage, rough grinding stage, discharge-electrochemical finishing stage, and fine grinding stage are t _a , t _b , t _c , t _d ; During the first 1/2T ₀ cycle of the tool electrode (11) motion, the pulse power supply (5) sends out a pulse voltage with a long pulse width and small amplitude, and the pulse width T _{1_on} and the pulse interval T _{1_off} rotate with the tool electrode (11) The period T ₀ conforms to the expression T _{1_on} +T _{1_off} ≤1/2T ₀ ; in the last 1/2T ₀ cycle of the tool electrode (11) movement, the pulse power supply (5) sends out a pulse voltage with a short pulse width and a large value, And the pulse width T _{2_on} and pulse interval T _{2_off} of the pulse voltage and the tool electrode (11) rotation period T ₀ conform to the expression T _{2_on} + T _{2_off} ≤ 1/2T ₀ , and conform to the expression T _{2_on} < T _{1_on} , and The long pulse width pulse voltage amplitude U ₁ is smaller than the short pulse width pulse voltage amplitude U ₂ ; Step 2: The workpiece (10) is connected to the positive pole of the pulse power supply (5), and the tool electrode (11) is connected to the negative pole of the pulse power supply (5). (11) Feed toward the workpiece along the preset feed direction (16), the working fluid (2) is sprayed out from the liquid outlet slot (17) on the side wall of the tool electrode (11), and enters the tool electrode (11) and the workpiece ( 10) within the processing gap; Step 3: In the discharge-electrochemical roughing stage, the tool electrode (11) rotates 1/4 turn around the axis, and the discharge electrochemical roughing electrodes (1) all enter the processing area. At the same time, the pulse power supply (5) emits multiple long With pulse width and small amplitude pulse voltage, multiple high-energy spark discharges (9) and violent electrochemical dissolution reactions are generated between the discharge electrochemical roughing electrode (1) and the workpiece (10), and a large amount of Processing products (3) and hydrogen bubbles (15); the fine grinding sheet (13) produces grinding effect on the surface after discharge electrochemical finishing, and the processing area produces grinding products (8), reaching the surface of the trimmed workpiece (10) Effect; Step 4: In the rough grinding stage, the tool electrode (11) continues to rotate 1/4 turn around the axis, and the rough grinding pieces (6) in the tool electrode (11) are all rotated into the processing area, and start to discharge the electrochemical rough machining electrode (1) Grinding occurs on the processed surface, resulting in a large amount of grinding products (8); at the same time, the pulse power supply (5) continues to emit a pulse voltage with a long pulse width and small amplitude, and the discharge electrochemical roughing electrode (1) and Multiple high-energy spark discharges (9) are generated in the machining gap of the workpiece (10), and a large number of workpiece (10) materials are rapidly eroded by the spark discharge (9) and electrochemical dissolution; Step 5: In the discharge-electrochemical finishing stage, the tool electrode (11) continues to go through 1/4 turn around the axis, and the discharge-electrochemical finishing electrodes (7) in the tool electrode (11) all enter the processing area. At the same time, the pulse The power supply (5) sends out multiple pulse voltages with short pulse width and large value, and multiple low-energy spark discharges (9) and weaker electric discharges are generated between the discharge-electrochemical finishing electrode (7) and the workpiece (10). Chemical dissolution reaction produces a small amount of processed products (3) and hydrogen bubbles (15); the rough grinding sheet (6) produces a grinding effect on the surface after discharge-electrochemical roughing, and a large amount of grinding products are produced in the processed area (8) , to achieve the effect of removing the material of the workpiece (10) with a large margin and finishing the surface of the workpiece (10); Step 6: In the fine grinding stage, the tool electrode (11) continues to go through 1/4 turn around the axis, and all the fine grinding pieces (13) in the tool electrode (11) are rotated into the processing area, and the discharge-electrochemical finishing is started. The surface of the workpiece (10) processed by the electrode (7) produces a grinding action to achieve the effect of trimming the surface of the workpiece (10); at the same time, the pulse power supply (5) continues to send out multiple pulse voltages with short pulse width and large value, and the discharge- Multiple low-energy spark discharges (9) are generated in the machining gap between the electrochemical roughing electrode (1) and the workpiece (10), and the material of the workpiece (10) is eroded by the low-energy spark discharges (9) and electrochemical dissolution; Step 7: With the continuous feeding of the tool electrode (11), the above steps 3 to 6 are repeated continuously, and under the action of intermittent spark discharge (9), electrolysis and grinding, the high efficiency of the material of the workpiece (10) is realized. Precision Machining. 3. The processing method according to claim 2, characterized in that: the tool electrode (11) body material is stainless steel, the discharge-electrochemical rough machining electrode (1) and the discharge-electrochemical finishing electrode (7) are made of Graphite or copper-tungsten alloy or red copper, the matrix material of the coarse grinding sheet (6) and fine grinding sheet (13) is resin-based or ceramic-based material, and the abrasive material of the reinforcing phase is diamond, CBN, SiC, Al ₂ O ₃ Abrasives, the coarse abrasive (4) particle size in the coarse grinding sheet (6) is 40# to 280#, the fine abrasive grain (12) particle size in the fine grinding sheet (13) is 400# to 1500#; and the workpiece ( 10) The material is titanium alloy or high temperature alloy or stainless steel or metal matrix composite material. 4. The processing method according to claim 2, characterized in that: the working liquid (2) is sodium nitrate or sodium chloride solution, and the concentration is not less than 5%. 5. The processing method according to claim 2, characterized in that the diameter of the bottom area of the tool electrode (11) body is 15-60 mm. 6. The processing method according to claim 2, characterized in that: the long pulse width and small amplitude pulse voltage are 10V-40V, the pulse width is 500us-10ms, the short pulse width and large amplitude pulse voltage are 40V-120V, The pulse width is 10us-300us.

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