410 results about "Electrical discharge machining" patented technology

The invention discloses an electrode programming method and device, a readable storage medium and a computer program product, and relates to the technical field of automation, and the method comprises the steps: obtaining a tool path machining program of a to-be-generated electrode, and carrying out automatic batch processing based on the tool path machining program to obtain a batch processing result, the batch processing comprising post-processing, treading, plotting and simulation; if a simulation result in the batch processing result indicates that simulation is passed, it is determined that electrode programming is completed; and if a simulation result in the batch processing result indicates that simulation is not passed, acquiring an input tool path modification instruction, acquiring a modified tool path processing program according to the tool path modification instruction, and returning to the step of performing automatic batch processing based on the tool path processing program to obtain the batch processing result according to the modified tool path processing program. The efficiency and the automation level of electrode programming are improved, and then the efficiency and the automation level of electric spark machining are improved.

The invention provides a double-curved-surface hole wall rotational flow umbrella oil nozzle for low-carbon fuel and a machining method, and relates to the technical field of gas turbine fuel injection. The nozzle comprises a needle valve, a needle valve seat, a spraying hole and a rotational flow groove; the needle valve and the needle valve seat form a sealing conical surface, the inner wall face of a spraying hole of the curved-surface rotational flow umbrella spraying nozzle is a double curved surface, the double curved surface and the sealing conical surface form a ruled surface, the rotational flow groove is formed in the inner wall face of the spraying hole, and the direction of the rotational flow groove is the generatrix of the ruled surface. The inner wall face of the spraying hole is designed to be the curved face, fuel is better guided to flow in the oil nozzle, the area of a low-pressure area is reduced due to sudden change of the direction in the fuel flowing process, and therefore cavitation is restrained from occurring and developing, and the phenomena that the spraying hole is blocked and mist spraying is unstable due to cavitation are improved; the rotational flow grooves in the curved surface can be achieved through the electric spark machining technology, the machining difficulty is reduced, meanwhile, the turbulent kinetic energy and the radial momentum of fuel can be effectively improved, spray distribution is more uniform, and the atomization quality is improved.

The invention discloses a multi-discharge efficient precision machining device and method for a milling cutter. The multi-discharge efficient precision machining device comprises a high-precision machining tool, an electric spark machining pulse power supply, a discharge monitoring device and a detection device. The high-precision machining machine tool comprises an electric spark machining machine tool, a spindle, a grinding wheel, a workbench and a machine tool body. The main shaft supports accurate movement in three directions; stable and controllable pulse current and voltage are output through the electric spark machining pulse power supply; a voltage probe and a current probe are arranged on the discharge monitoring device, and discharge voltage and current data are collected in real time through the voltage probe and the current probe; the detection device comprises a non-contact optical measuring instrument, the abrasion of the grinding wheel is monitored through the non-contact optical measuring instrument, meanwhile, the machining allowance of the milling cutter blank placed on the workbench and the size precision after finish machining are measured, and the surface quality of the milling cutter is detected; the machining precision and efficiency of the milling cutter are improved, and efficient precision machining of the milling cutter is achieved.

The invention belongs to the technical field of special maintenance of reactor bodies, and particularly relates to an electric spark machining head for cutting a sleeve flange in a narrow space. Comprising an expansion mechanism, a fine adjustment jacking mechanism, a rotating mechanism, an electrode and a radial servo feeding mechanism, the rotating mechanism provides rotary motion of the electrode and drives the electrode to conduct rotary machining, the radial servo feeding mechanism provides radial feeding motion of the electrode, and the expansion mechanism plays a role in fixing and positioning. The fine adjustment jacking mechanism drives the rotating mechanism, and the radial servo feeding mechanism drives the electrode to do up-down, rotating and radial feeding movement. The method has the beneficial effects that the damage to the pressure-bearing boundary of the primary loop of the nuclear power unit can be avoided under the condition that the heat sleeve is worn out of limits and needs to be replaced aiming at the common problem of wear settlement of the heat sleeve of the control rod driving mechanism of the nuclear power unit, and the whole dismantling work has relatively high safety, reliability and economical efficiency; and greater benefits can be created for the operation of a power plant.

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.

The utility model discloses a stable and adjustable gravity type automatic wire tightening device suitable for a linear cutting machine tool, which comprises a first wire tightening mechanism, a second wire tightening mechanism, a third wire tightening mechanism, a fourth wire tightening mechanism, a fifth wire tightening mechanism, a sixth wire tightening mechanism, a fifth wire tightening mechanism and a sixth wire tightening mechanism, the gravity wire tightening mechanism is detachably connected with the first wire tightening mechanism and is used for adjusting the tensioning force of the molybdenum wire; the lower end of the gravity wire tightening mechanism is detachably connected with a heavy hammer locking and releasing mechanism, the tensioning force of the molybdenum wire is adjusted by increasing or reducing balancing weights according to the principle that the gravity is constant, so that the molybdenum wire of the wire cut electrical discharge machining tool can obtain the constant, uniform, continuous, stable and adjustable tensioning force in the running process, and the service life of the wire cut electrical discharge machining tool is prolonged. Therefore, the machining precision is further improved, the problem of single-side wire loosening of the wire cylinder is solved, the machining precision of a linear cutting machine tool can be further improved, the machining precision of workpieces such as hole pattern sample plates is guaranteed, and thick workpieces can be easily machined.

A flexible electrode (2) in-line deformation electrical discharge cutting method. During machining of complex surfaces, such as blisks, a flexible electrode (2) is used as a tool electrode for electrical discharge machining, the surface of the flexible electrode (2) is used as a machining surface for performing cutting-type electrical discharge machining along a preset path, and, according to the curvature characteristics of the machined surfaces, the flexible electrode (2) undergoes in-line deformation, thereby completing the machining of complex surfaces. The flexible electrode (2) is made of a material having good electrical conductivity and elasticity, so as to ensure that the flexible electrode (2) can recover after deformation. Using the flexible electrode (2) for realizing electrical discharge cutting machining for three-dimensional complex surfaces can simplify a design process for the tool electrode and improve the electrical discharge machining efficiency.

The invention discloses a special-shaped hole machining system and a special-shaped hole machining method. The machining method of the special-shaped hole comprises the steps that quasi-continuous laser is adopted for machining in a machining target to form a prefabricated hole; carrying out scanning processing on the prefabricated hole by adopting ultrafast laser according to a layer-by-layer scanning removal mode so as to process the prefabricated hole into a special-shaped hole; and the straight round section of the special-shaped hole is subjected to fine trimming treatment in any one of ultrasonic-assisted mechanical tool cutting machining or ultrasonic-assisted electric spark machining and electro-hydraulic beam machining, so that the taper is eliminated. According to the special-shaped hole machining system and the special-shaped hole machining method provided by the embodiment of the invention, machining of complex special-shaped holes can be achieved, and meanwhile the problems of conicity and wall damage are avoided.

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 discloses a method for machining a deep-hole double-angle small-conical-surface inner cavity of an oil nozzle and the oil nozzle, and the method comprises the following steps that S1, a center drill is used for centering before drilling so as to machine a center hole; s2, a guide drill is used for conducting deep hole guide machining on the center hole so that a first deep hole can be machined; s3, a deep hole drill is used for conducting chambering machining on the first deep hole so that a second deep hole can be machined; s4, forming machining of a taper molded surface is conducted on the second deep hole through a forming drill so that the double-angle small-conical-surface inner cavity deep hole can be machined; when the double-angle small-conical-surface inner cavity deep hole is machined, a forming drill with the drill point angle from large to small is adopted for machining step by step. The method is adopted for deep hole machining of the oil nozzle, machining defects such as inner wall burrs are effectively removed, the machining quality is improved, electric spark machining is replaced with a guide drill, a deep hole drill and the like, the machining time is saved, the production efficiency is improved, and the machining cost is reduced.

The invention discloses an electrode programming method, a server, a readable storage medium and a computer program product, and relates to the technical field of automation, the method is applied to the server, the server is connected with a task distribution client, and the method comprises the following steps: responding to an electrode programming task issued by the task distribution client, obtaining an electrode three-dimensional model according to the electrode programming task; performing automatic tool path programming processing according to the electrode three-dimensional model to obtain a tool path processing program; and performing automatic batch processing based on the tool path processing program to obtain a batch processing result so as to complete electrode programming, the batch processing including post-processing, treading, plotting and simulation. The efficiency and the automation level of electrode programming are improved, and then the efficiency and the automation level of electric spark machining are improved.

The utility model relates to the technical field of electric spark machining, in particular to a part positioning jig for electric spark machining, which comprises a base, a fixing table is arranged at the top of the base, side grooves are arranged on two sides of the outer surface of the fixing table, and four support legs are mounted at the bottom of the base. Positioning structures are arranged in the two side grooves, the two positioning structures comprise threaded rods, the two threaded rods are in threaded connection with the side grooves, and rotating handles are installed at one ends of the two threaded rods; by means of the positioning structure, when common parts and special-shaped parts are machined and positioned, the parts are placed in the fixing table, then rotating handles are rotated correspondingly, threaded rods are made to move forwards, and therefore fixing blocks can drive connecting rods to slide forwards in moving grooves; therefore, the side line of the part can be hooped, the part can be fixed, and the purpose of fixing and positioning different special-shaped parts is achieved.

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 dynamic parameter optimization method in electrical discharge machining, which relates to the technical field of electrical discharge machining, and comprises the following steps of: installing a high-frequency acoustic emission sensor on an electrical discharge machining machine tool, acquiring acoustic emission signals, processing the acoustic emission signals, extracting key features, comparing the key features with a preset key feature threshold value, and determining the dynamic parameters of the electrical discharge machining. According to a comparison result, different adjustment strategies are adopted, the current of the spindle motor is synchronously collected, a preset key feature threshold value is dynamically adjusted, the adjustment strategies are tested according to preset steps, and the preset key feature threshold value is adjusted and the adjustment strategies are optimized according to a test result. The correlation between the current change and the acoustic emission signal strength is established, and the processing efficiency and the product quality are improved by testing and optimizing the adjustment strategy in different discharge states, so that the requirements of the modern high-end manufacturing field on high-precision and high-efficiency processing are better met.

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 relates to the field of cutting die wire cutting, and discloses a cutting die wire cutting positioning device which comprises a circular truncated cone, a disc is embedded in the top face of the circular truncated cone, two side plates are arranged on the top face of the disc, two connecting plates are arranged on the opposite faces of the two side plates correspondingly, a sliding rod and a threaded rod are arranged between the two connecting plates correspondingly, and the outer wall of the sliding rod and the outer wall of the threaded rod are both sleeved with sliding blocks. Rectangular tables are arranged on the top faces of the two sliding blocks, and movable openings are formed in the top faces of the rectangular tables. Cutting dies of different sizes are clamped and fixed, a threaded rod is driven to rotate through the output end of a first motor, and the threaded rod rotates to drive a sliding block, a rectangular table and the other sliding block on the threaded rod to move in the horizontal direction of a sliding rod; and the output end of a second motor drives a disc and a circular ring to circumferentially rotate in an annular groove, and the disc rotates to drive a rectangular table to rotate, so that the cutting die between the two clamping plates can be linearly cut in different directions, and the operation range of the cutting die is greatly expanded.

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 present invention belongs to the field of electrospark machining technology and equipment, and in particular relates to a magnetic-assisted electrode structure and an electrode replacement method. The magnetic-assisted electrode structure includes: a fixing seat, a discharge bead made of a conductive material, and a positioning mechanism connected to the fixing seat. The fixing seat is provided with a receiving hole, and the receiving hole has a discharge hole located in the fixing seat, and a plurality of discharge beads are arranged in the receiving hole; the positioning mechanism has a locking state and an unlocking state for each discharge bead. When the positioning mechanism is in the locking state, each discharge bead is electrically connected and arranged in the receiving hole in sequence, and one of the discharge beads is partially exposed at the discharge hole; when the positioning mechanism is in the unlocking state, the connection between any two adjacent discharge beads is released, so that the discharge bead can be completely separated from the receiving hole at the discharge hole. The present invention improves the convenience and replacement efficiency of discharge bead replacement and positioning.

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.