303 results about "Electrical discharge machining" patented technology

A method for preparing a profiled microchannel plate heat exchanger, and belongs to the technical field of heat exchange. The method based on a combination of a plurality of methods formed by selective laser melting and micro electrical discharge machining can realize a profiled microchannel plate heat exchanger having large aspect ratio flow channels and closed profile section flow channels.

The invention relates to the technical field of precision manufacturing and intelligent control, and particularly discloses an intelligent spark machine machining parameter optimization method based on effect feedback, which comprises the following steps of: calculating an abnormal characteristic value of an electrode feeding speed by using Haar wavelet transform, and analyzing time sequence data of conductivity of a working solution by using fast Fourier transform; according to the method, abnormal characteristic values are obtained, the characteristic values are constructed into a comprehensive characteristic vector, the comprehensive characteristic vector is input into a random forest model for comprehensive analysis, an electric spark machining effect score is generated, the system can dynamically adjust the electrode feeding speed and the working fluid conductivity based on the effect score, and it is ensured that machining parameters are always in the optimal configuration; according to the method, the machining efficiency is improved, the rejection rate is reduced, the surface quality and the size precision of the product are greatly improved, and the requirement of precision manufacturing is met.

A system for measuring the surface roughness of surfaces machined by electrical discharge machining (EDM) using a convolutional neural network, comprising: an image recording device with a camera module for recording images of a machined surface with depressions and burrs produced by electrical discharge machining; an image preprocessing module that is connected to the image capture device and is configured to improve the texture contours of the captured images and optimize the image; a Convolutional Neural Network module configured to receive images captured by the image preprocessing module, wherein the Convolutional Neural Network module comprises the following: a feature extraction submodule with multiple convolution and pooling layers, wherein this submodule is configured to analyze the distribution of light intensity variations in the acquired images, where darker areas correspond to valleys and lighter areas to edges of the processed surface, and extracts features from this; and a classification submodule with fully connected layers and an output layer, wherein the classification submodule is configured to predict an arithmetic mean roughness value (Ra) based on the extracted features; a computer device comprising a processor, a working memory and a storage unit, wherein the computer device is configured to execute the convolutional neural network module using the processor, the execution parameters being loaded from memory into the working memory; and an output module integrated into the computer device, wherein the processor is configured to create a database of samples with recorded surface roughness values ​​within the storage unit, the database containing the preprocessed image with timestamp and image metadata as well as the results obtained from the prediction, and wherein the processor is further configured to deliver the predicted arithmetic mean roughness value (Ra) from the output layer to a user interface.

A wire electrical discharge machining (WEDM)-adapted wire electrode includes a core material composed of brass having a zinc concentration of greater than 40 mass %, and a coating layer covering a periphery of the core material, wherein the coating layer is composed of brass having a zinc concentration higher than the zinc concentration of the core material and of 44 mass % or more and 50 mass % or less, and wherein a ratio of a thickness of the coating layer to a diameter of the WEDM-adapted wire electrode is 2% or more and 20% or less.

An assembly welding method for a high-temperature alloy 3D printing piece in a solid solution aging state comprises the steps that firstly, a plurality of special plugs are machined through a welding tool, and then a plurality of powder clearing holes in the solid solution aging state of the high-temperature alloy 3D printing piece are blocked in the mode that the special plugs are connected through manual tungsten electrode argon arc welding; then X-ray inspection is conducted on the high-temperature alloy 3D printing piece in the solid solution aging state, if redundant substances appear in an inner cavity channel of a product, the outer wall of the 3D printing piece is punched through an electric spark technology, and after the redundant substances are removed, the outer wall of the 3D printing piece is blocked in the mode that argon tungsten-arc welding is connected with a special plug; and if welding defects such as cracks occur in the powder cleaning hole / external hanging piece welding seam, the powder cleaning hole / external hanging piece welding seam is blocked in a mode of welding a special plug through argon tungsten-arc welding after the defects are eliminated.

The invention relates to an automatic wire threading method and device for reciprocating wire cut electrical discharge machining. The automatic wire threading device comprises a pretreatment part, an upper wire guide part, a lower wire guide part and a signal trigger, the pretreatment part straightens and cuts off the front section of the electrode wire, the upper wire guide part comprises a first sensor and a hydraulic wire conveying piece, and the first sensor is used for detecting the starting point position of a wire head of the electrode wire; the guide pipe assembly is provided with a second wire guide path, the axis of the second wire guide path is tangent to the wire storage barrel at the first position, and an outlet of the second wire guide path is adjacent to or abuts against the wire clamping mechanism on one side of the wire storage barrel at the second position. And the signal trigger is positioned between the outlet of the second wire guide path and the wire clamping mechanism. According to the automatic wire threading device, wire threading of the electrode wire is achieved, the operation difficulty is lowered, the personnel intervention degree is lowered, and the wire threading efficiency is improved.

The invention discloses a control system and method for a precise automatic multi-axis numerical control electric spark forming machine, and relates to the technical field of electric spark forming machines, and the system comprises a motion control module which is used for controlling an electrode of the electric spark forming machine to execute an open circuit discharge interface detection process to determine an initial interface, and controlling the electrode to be located on the initial interface; the flushing control module is used for responding to the detected initial interface, controlling the working solution to flow at a first speed in a first time interval and flow at a second speed in a second time interval after the first time interval to flush metal particles generated by the metal material, the first speed is larger than the second speed, and the first speed is larger than the second speed. The working fluid flows at a second speed; and the discharge detection module is used for determining the initial interface as an open-circuit discharge interface if the discharge of the electrode is detected in the second time interval in response to the end of the first time interval. According to the invention, the accuracy of determining the open-circuit discharge interface is improved.

The application belongs to the technical field of electric spark machining, and discloses an electric spark machining method and an electric spark machining device. The electric spark machining method comprises the following steps: dividing a workpiece to be machined into a plurality of spliced and connected machining areas, and disassembling an electric spark electrode into a plurality of independent electrode modules, the plurality of electrode modules correspond to the plurality of machining areas one by one, and each electrode module processes a corresponding machining area; the plurality of electrode modules sequentially process the corresponding machining areas until the machining of each machining area is completed. The electric spark machining method provided by the application reduces the discharge area of each electrode module on the machining area in the machining process by sequentially processing the corresponding machining area by the plurality of electrode modules, avoids a large instantaneous fluid negative pressure generated by each electrode module when the electrode is lifted, ensures that the working fluid fully penetrates and infiltrates the machining area in the machining process, avoids damaging the workpiece to be machined, and ensures the machining quality.

The invention provides a shell rib mirror image inclined hidden hole electric machining clamping and positioning tool and a using method thereof, and belongs to the technical field of electric machining tools. The problem that in the prior art, the requirements for electrode extension adaptation, hole axis orientation and reliable positioning cannot be met at the same time, and consequently the inclined dark hole electric spark machining precision and efficiency are difficult to guarantee is solved. A threaded bushing is in threaded connection with an inclined plane of a supporting base, and a positioning disc coaxially sleeves the outer side of the threaded bushing and is connected with the supporting base; a circular spigot matched with the outer circle of the positioning disc is formed in the lower end face of the conical shell, a fixing spigot is formed in the upper end face of the conical shell, and a pressing plate screw is screwed into an internal thread of the threaded bushing to fix the fastening pressing plate to the fixing spigot of the conical shell; a first L-shaped support and a second L-shaped support are symmetrically arranged on the left side and the right side of the supporting base. The problems that in the prior art, the requirements for electrode extension adaptation, hole axis orientation and reliable positioning cannot be met at the same time, and consequently the inclined dark hole electric spark machining precision and efficiency are difficult to guarantee are effectively solved.

The application provides a precision machining method for earphone mesh mold forming parts, comprising the following steps: designing a copper electrode three-dimensional design drawing according to an earphone mesh mold forming part three-dimensional design drawing; setting a machining strategy and machining parameters according to the copper electrode three-dimensional design drawing, and generating a numerical control machining program, the machining strategy comprising sequentially performing rough machining, semi-finishing machining and finishing machining on the copper electrode blank; using a precision numerical control machine tool to process the copper electrode blank according to the numerical control machining program to form a copper electrode, in the finishing machining, the inner hole on the copper electrode is machined by using a fifth tool with a diameter of 0.3 mm; screening out qualified copper electrodes according to quality detection standards; using a precision numerical control discharge spark machine to perform electric spark machining according to preset discharge parameters and the qualified copper electrodes, and the part blank is made into an earphone mesh mold forming part. The application can solve the problems of hole deformation and size precision after copper electrode machining, and improve the qualified rate of copper electrodes and earphone mesh mold forming parts.

The invention belongs to the technical field of nuclear power plant equipment maintenance, and particularly relates to an underwater electric spark maintenance device based on rigid-flexible coupling positioning in an irradiation environment. Comprising an underwater carrying device, an electric spark machining device, a camera monitoring device and a control system. The underwater carrying device provides carrying and positioning supporting for the electric spark machining device, the electric spark machining device achieves underwater cutting of the instrument casing pipe, the control system is arranged on the water, the underwater cutting operation of the instrument casing pipe is completed through remote operation, and the maintenance process is monitored and recorded in real time through the camera monitoring device. The method is simple to operate and short in consumed time, secondary damage to the lower reactor internals is avoided, and the lower reactor internals are not affected to return to the reactor for reuse.

The utility model discloses a numerical control electric spark discharge processing machine, include: electric spark processing machine tool is provided with the bottom plate in, the bottom plate bottom is provided with the second electric push rod, and the lifting end of second electric push rod is provided with the connecting plate, and the connecting plate surface is provided with the vertical board, and the vertical board side is provided with the first electric push rod, and the processing plate side is provided with the removal groove, and the removal groove is provided with the moving plate in, and the moving plate is provided with the lifting plate in, and the lifting plate surface is provided with the base, and the base side is provided with the clamping plate, beneficial effect is: first can through the first electric push rod to the clamping plate and push, thereby just can use two sets of clamping plate clamping effect to the workpiece positioning clamping, thereby the subsequent electric spark processing machine tool is convenient to the workpiece and processes, when processing ends, can start second electric push rod and make the connecting plate and go up, thereby just can make the processing plate and go up, thereby convenient subsequent to the workpiece after processing and take down.

The application provides an electric spark machining method for a deep and narrow ventilation groove of a guide vane and the guide vane, and the method comprises the following steps: first, electric spark high-speed small-hole machining is adopted, a plurality of bottom holes are machined on the guide vane to be machined by using a first electrode; then, a second electrode is made, the shaped electrode and corresponding clamping auxiliary components are installed to an electric spark forming machine; electric spark forming oil immersion machining is adopted, the lateral oil flushing of the guide vane to be machined is increased, the machining parameters of the electric spark forming machine are set, and the deep and narrow ventilation groove is machined. The application pre-machines part of the bottom holes in the position to be machined in the guide vane, and the method of electric spark forming machining of the shaped groove is adopted to machine the deep and narrow ventilation groove on the plurality of bottom holes, so that the oil flushing and chip removal conditions during the forming machining of the deep and narrow ventilation groove are improved, the electric spark forming machining efficiency and surface machining quality of the guide vane are improved. Moreover, the application can be applied to the machining of various deep holes, grooves and flow channels, and has good applicability.

The present invention provides a composite material with excellent conductivity and mechanical strength, an electrode for electrical discharge machining, and a method for manufacturing the composite material. [Solution] A composite material 1 comprising a matrix 2 made of tungsten and two or more particles 3 made of a good electrical conductive material present within the matrix 2, wherein the particles 3 are spaced apart from each other.

The utility model discloses a positioning tool and a machining structure for combined gear electric spark machining, according to the positioning tool for combined gear electric spark machining, a bottom plate is used for supporting and connecting all parts and ensuring the position relation of all the parts, and a positioning core column is used for being matched with an inner hole of a combined gear to achieve coarse positioning of the combined gear on the bottom plate; the positioning pin is matched with the positioning hole in the tooth-shaped positioning plate to realize accurate positioning of the combined gear on the bottom plate, and the tooth-shaped positioning part is matched with the notch in the outer tooth to realize circumferential positioning and limiting of the tooth shape of the combined gear on the bottom plate; the positioning tool is easy to use, circumferential positioning installation of the tooth profile of the combined gear is achieved, the problem that circumferential positioning is difficult when the combined gear is clamped at present can be effectively solved, the machining efficiency can be improved, and the precision of electric spark machining of the tooth tip is guaranteed.

The invention discloses a gold label implant and positioning feature processing equipment thereof, and relates to the field of implantable medical instruments, a gold label is a cylinder, and the side wall of the gold label is provided with positioning features; positioning feature machining equipment comprises an electric spark machining device and a control piece. The control piece comprises a rotating assembly and a power connection assembly; the rotating assembly comprises a mounting frame, a motor arranged on the mounting frame, a first bevel gear connected with the motor, a second bevel gear meshed with the first bevel gear, a chuck piece fixed to the second bevel gear and a clamping piece arranged on the chuck piece. Positioning features are marked on the surface of the metal marker, friction force can be effectively increased, the implant is made of inert alloy materials and is easy to recognize and track, and conventional medical examination is not affected; the positioning feature machining equipment adopts electric spark machining, effectively fixes a gold-labeled raw material alloy thin wire, meanwhile, the gold-labeled raw material alloy thin wire is connected into an electrode, the rotating angle of the alloy wire can be controlled through a motor during machining, and positioning features are gradually punched on the side wall.

The invention relates to an electrode wire threading pretreatment device and method and a wire cut electrical discharge machining system. According to the electrode wire threading pretreatment device, a first conductive part, a third conductive part and a second conductive part are arranged at intervals in the first direction, the first conductive part, the third conductive part and the second conductive part are all used for abutting against an electrode wire, a first pressing block is rotatably arranged on a pretreatment frame and is provided with a lap joint position and a first disengaging position, and the first pressing block is used for pressing against the electrode wire at the lap joint position. The first pressing block is in lap joint with the first conductive part to increase the moving resistance of the electrode wire, the second pressing block is rotatably arranged on the pretreatment frame and is provided with a fixing position and a second disengaging position, and at the fixing position, the second pressing block abuts against the second conductive part to fix the electrode wire. The electrode wire threading pretreatment device is simple in structure, low in cost and convenient to operate, a linear section can be formed on the front section of the electrode wire, a sharp wire head is formed, and therefore follow-up wire threading is facilitated.

The invention provides a double-wall turbine blade large-depth-diameter-ratio film hole remelting-layer-free machining method which comprises the steps that a coaxial electric spark ultrasonic drilling integrated technology is adopted, an electric spark high-speed small hole machining technology is used for removing materials, an electric spark machining surface is subjected to finishing and reaming through drilling, the surface remelting layer is removed, meanwhile, the surface roughness is improved, and the remelting-layer-free machining method for the double-wall turbine blade large-depth-diameter-ratio film hole is achieved. And ultrasonic vibration is added in the drilling process to reduce orifice burrs and tool loss. The problem of machining slippage of large-depth-diameter-ratio inclined holes in the air film holes is solved through a staged technology and parameter development, meanwhile, based on signal control, extraction and contact sensing modes in the machining process, self-adaptive adjustment and control of the machining depth are achieved, and remelting-layer-free and wall-damage-free machining of the air film holes of the blade body of the double-layer-wall turbine blade is achieved. The method has the advantages that the method is suitable for remelting-layer-free and high-precision surface machining requirements of single-crystal-material double-wall turbine blade film holes, is suitable for machining of multi-model turbine blade film holes, and can be popularized to machining of precise micro holes such as spray rods and nozzle holes.

The invention provides an electric spark discharge machining machine control method and system based on industrial data processing, and relates to the technical field of industrial data processing.The method comprises the steps that in the movement process of an electric spark machining machine, working conditions are captured, and high-frequency real-time sensing data flow is output; receiving a high-frequency real-time sensing data stream through a redundant dual-channel RS485 bus, and synchronously calling a processing position time sequence slice; isomorphic processing scene matching is carried out to obtain a historical control parameter sequence; outputting a multi-modal real-time working condition feature tensor; carrying out discharge parameter increment prediction, and outputting an updated pulse parameter adjustment vector; sending the parameters to a PLC (Programmable Logic Controller) to drive a discharge module of the processing machine to execute smooth parameter adjustment transition; and iteratively executing closed-loop prediction parameter adjustment. The technical problems that in the prior art, an electric spark machining machine often depends on manual adjustment and experience to select discharge parameters, so that the precision and consistency of the machining process are difficult to guarantee, the debugging period is long, and the production efficiency is low are solved.

The application discloses a kind of electric spark cutting mechanism with error adjustment function and linear cutting machine tool, including column, beam, lower guide rod, upper guide rod, electrode wire, telescopic guide rod, two rotating shafts, two transmission lever bases, two cams, two electrode wire seats, two push rods and a transmission lever.The above electric spark cutting mechanism with error adjustment function can ensure that the position of electrode wire coincides with the theoretical cutting line when vertically processing workpiece, and can make the middle part of electrode wire translate a small distance while keeping the deflection angle unchanged when taper processing workpiece through two toggle assemblies, compensate the small parallel gap between the theoretical cutting line, make electrode wire accurately locate the position of theoretical cutting line, avoid the generation of cutting error, and improve the processing precision.

The invention belongs to the technical field of electric spark machining, and particularly relates to a device for improving machining efficiency after electric spark small hole penetration, which comprises a tubular electrode, a guide sealing mechanism and a working liquid flow channel. A plurality of small holes are formed in the side wall of the tubular electrode and communicated with the center channel, and the tubular electrode is fixed to the guide shaft through a clamp and is in sliding fit in the guide sealing mechanism. A machining workpiece is arranged below the guide sealing mechanism in a sealed mode. When the electrode does not penetrate, the working liquid flows out from the center hole of the electrode and is discharged from the liquid outlet through the electric spark machining gap and the working liquid flow channel; after penetrating, the working fluid flows into the working fluid flow channel and the electric spark machining gap through the small holes in the side wall and is finally discharged through the workpiece penetrating hole. And through double-way flushing switching of the side wall small hole and the center hole, the problem of unsmooth chip removal caused by flushing liquid interruption after penetration is solved, and the machining stability and efficiency of the depth-diameter ratio small hole are remarkably improved.

This invention discloses a method for measuring the maximum depth of continuous etch pits under uninterrupted single-pulse electrical discharge machining (EDM). The invention derives the maximum depth of etch pits when the EDM fluid is free of mixed powder and the workpiece is stationary by performing single-pulse etching trials on the workpiece. Then, by performing single-pulse etching trials on the workpiece with mixed powder in the EDM fluid and the workpiece stationary, the maximum depth of a single etch pit is derived when the EDM fluid contains mixed powder and the workpiece is moving. Finally, the maximum depth of all but the first etch pit in a plurality of consecutive etch pits is derived when the EDM fluid contains mixed powder and the workpiece is moving. This invention provides data for measuring the surface roughness of workpieces subjected to uninterrupted single-pulse etching under different discharge voltages, discharge currents, discharge times, or workpiece materials.

The application discloses a rudder shaft hole key groove electric spark machining method and a machining system, and belongs to the technical field of electro-hydraulic rudder machining. The problems of low rudder shaft qualification rate, low machining efficiency and high machining cost are solved. The electric spark machining method comprises a rough machining process and a rounding process. In the rough machining process, a first electrode is configured on an electric spark machining device, and the electric spark machining device processes a key groove in the rudder shaft hole according to preset electric parameters. In the rounding process, a second electrode is configured on the electric spark machining device, and the electric spark machining device controls the second electrode to perform rounding treatment on the key groove according to preset electric parameters. The preset electric parameters include a preset pulse width, a preset average current, a preset pulse interval and a preset amplitude voltage.

The invention relates to a method and device for electrical Wire electrical discharge machining method (WEDM) for forming a desired pattern on a workpiece by a WEDM machine tool, in which a preliminary voltage pulse is applied to a gap between a wire electrode and a workpiece, and in which, at the breakdown of said preliminary voltage pulse, a first machining discharge pulse is applied to the wire electrode.

This invention relates to the field of machine tool equipment technology, and more particularly to an electrical discharge machining (EDM) machine tool, comprising a base and a mounting frame. An electrode assembly is mounted on the mounting frame, and a support frame is located above the mounting frame. A support base is fixed to the top of the support frame. The support base has symmetrically distributed positioning posts on both sides, and each positioning post has a groove on its closest side. A clamping mechanism is located inside the groove. Symmetrically distributed guide cylinders pass through the support frame, and the guide cylinders are connected to a top support mechanism, which supports the positioning posts. This invention achieves fully automated positioning and clamping of cylindrical workpieces through the coordinated operation of the sliding mechanism, the top support mechanism, and the clamping mechanism. Manual centering and clamping are eliminated, and the workpiece is automatically centered and firmly clamped before moving to the electrode assembly's machining position, effectively preventing shaking and displacement during machining and improving the accuracy and stability of EDM.

The application discloses a high-energy electric spark milling machining gradient ring gas flushing chip removal device and method, and belongs to the technical field of electric spark machining. The device comprises a hollow electrode, the electrode is connected with the main shaft system of an electric spark machine tool through a clamp, and a ring flushing nozzle mechanism is arranged on the electrode. The ring flushing nozzle mechanism comprises a gas flushing nozzle, a circumferential driving assembly and an axial driving assembly. A ring-shaped air chamber is arranged in the gas flushing nozzle. A plurality of partition plates are uniformly arranged in the ring-shaped air chamber in the circumferential direction. The ring-shaped air chamber is divided into a plurality of air cavities by the partition plates. Each air cavity corresponds to an air inlet. An air outlet for spraying gas to the machining gap between the electrode and a workpiece is arranged at the bottom end of the air cavity. The spraying angles of the air outlets in the air cavities are different. While flushing liquid medium in the electric spark milling, the machining position is covered by multi-directional and flexible adjustable air flow. While realizing high-energy discharge and etching, the problem of accumulation of molten etching products in the machining gap is effectively solved, and efficient chip removal is realized.

The invention relates to the related technical field of electric spark machining devices, in particular to a nozzle flow channel electric spark machining device based on a powder mixed medium, which comprises a machining platform, a Y-axis moving seat, an X-axis moving seat, a clamping mechanism, a cutting line, a working liquid spray head and a liquid collecting hopper, supporting legs are fixedly installed at the four corners of the bottom of the machining platform, a rectangular groove is formed in the center of the machining platform, and a Y-axis guide rail is fixedly installed at the position, located on the front side of the rectangular groove, of the machining platform; according to the nozzle flow channel electric spark machining device based on the powder mixing medium, the working platform, the Y-axis moving base, the X-axis moving base, the clamping mechanism, the cutting line, the working liquid spraying head and the liquid collecting hopper are combined to form the nozzle flow channel electric spark machining device based on the powder mixing medium, so that working liquid during operation of the electric spark machining device is effectively recycled, and the cyclic utilization frequency of the working liquid is effectively increased; therefore, the overall operation cost of the electric spark machining device is reduced.

A wire electrical discharge machining method for forming a machined shape having a narrow portion (22) by performing enlargement machining on a workpiece (W) with a wire electrode (5) comprises: a first step of performing a first machining operation to machine the center of the narrow portion (22) using a first machining trajectory (Q1) before performing the enlargement machining; and a second step of performing enlargement machining on the portion of the machined shape excluding the center using a second machining trajectory (Q2) after performing the first machining operation.

The present application belongs to the field of graphite material precision machining, and particularly relates to a graphite taper hole compound machining system and process. The system comprises: an automatic milling device, which performs automatic milling machining on graphite workpieces installed in a clamp groove to process a prefabricated taper hole with a size allowance on the graphite workpiece; a secondary dust collection device, which performs secondary dust collection on the inside of the clamp groove; an electric spark machining device, which performs electric spark precision machining forming on the prefabricated taper hole; a workbench, which supports the clamp groove when machining the taper hole and is arranged across the automatic milling device, the secondary dust collection device and the electric spark machining device; a clamp groove, which is a groove body structure and internally installed with a clamp for clamping the graphite workpiece; a clamp groove walking mechanism, which drives the clamp groove to walk on the workbench and automatically switch between the devices; and a liquid injection device, which injects liquid medium for electric spark machining into the clamp groove. The present application can realize full automation through one-time clamping and can guarantee machining quality and control pollution.

The invention discloses a tool electrode and a machining method, and relates to the technical field of electric spark machining, a conductive bonding layer is bonded to the tool electrode, so that the conductive bonding layer which is bonded to the tool electrode and is located on the current working face and the tool electrode are subjected to loss corrosion removal at the same time when a workpiece material is subjected to corrosion removal through spark discharge; under the flowing action of the insulating liquid medium, the etched conductive bonding layer is mixed and bonded with metal chips of the tool electrode and the workpiece which are etched together to form carbon slurry, the carbon slurry is attached to the working surface of the tool electrode, and a layer of protective film is formed on the working surface of the tool electrode; therefore, in the workpiece machining process, the protective film attached to the working face is continuously damaged, a new protective film is generated through continuous spark discharge, the working face of the tool electrode is always covered with the protective film, the actual loss of the tool electrode in the workpiece machining process is greatly reduced, and the machining efficiency of the workpiece is improved. And the service life of the tool electrode can be prolonged.