Abstract: A wire discharge machining apparatus including a plurality of main guide rollers disposed in parallel at intervals, one wire that is wound between the guide rollers while being spaced apart from one another at a fixed pitch to form cutting wire sections between a pair of guide rollers and travels according to the rotation of the main guide rollers, and power feed terminal units that feed electric power to wires of the cutting wire sections. The wire discharge machining apparatus performs cutting of a work piece with the cutting wire sections, suspends cut-out of semiconductor wafers from the work piece in a state in which a part of the semiconductor wafers is connected to the work piece, brings the wires of the cutting wire sections close to one cut surfaces, and scans the cut surfaces in a discharge-machined state.

Abstract: A holding apparatus, which is used in electrical discharge machining for cutting a workpiece into slices at intervals of wires arranged in parallel to each other, includes: a holding unit for holding the workpiece so as to prevent the workpiece from falling from the holding apparatus; and an energization unit for energizing the workpiece so as to pass current through the workpiece. The holding unit is disposed outside a place at which the wires and the holding unit interfere with each other. The energization unit is disposed at a place at which the cutting of the workpiece into slices by the wires ends. A portion of the energization unit, which is brought into contact with the workpiece at the place at which the cutting of the workpiece into slices ends, has a surface shape that is prevented from conforming to a machining surface of the workpiece.

Abstract: A wire electrical discharge machining apparatus includes: multiple main rollers around which a wire winds in parallel; multiple workpiece feeding units for feeding the workpiece toward the wire; a machining power supply unit for supplying a machining voltage to the workpiece; and a power supply terminal for supplying the machining voltage to the wire. The multiple workpiece feeding units are respectively arranged at a first position for feeding the workpiece toward a wire portion having a wire plane of the wire and a second position for feeding another workpiece toward another wire portion having another wire plane of the wire. The power supply terminal is arranged at a third position between the first position and the second position. The machining voltage supplied from the single machining power supply unit is supplied to the workpieces to be electrically discharge machined by the multiple workpiece feeding units.

Abstract: A wire electrical discharge machine is capable of step machining by setting only a position located anterior to a step portion of the workpiece during a setup operation before machining, without setting an inclination finishing position of a wire electrode after passing the step portion. A machining program is read, and when a wire electrode reaches a preset inclination starting position in front of a step position, inclination control of the wire electrode is started. Then, when the wire electrode has passed the position of the step portion, the inclination control of the wire electrode is finished.

Abstract: In a method of welding a cut-out part with a workpiece at a preselected area in a thickness direction of the workpiece in a wire electrical discharge machining to retain temporarily or tentatively the part on the workpiece, a wire electrode 5 tilted in posture cuts the workpiece 6 to form a slant cutting surface 30 at a spark discharge location in a desired contour 21 in the workpiece 6. The wire electrode 5 after kept in an upright posture executes the welding process on the workpiece 6 along the slant cutting surface. A plurality of the welded spots is formed over a preselected length at preselected areas in the thickness direction of the workpiece 6. Even if the cut-out part 26 weighs more or the spark discharge is executed on the workpiece 6 overlapped one on the other, the welding spot 20 is formed in the thickness direction of the workpiece 6 adequately depending on the working situation to tentatively retain the cut-out part 26 on the workpiece 6.

Abstract: The tension measuring unit that measures a physical amount corresponding to tension of a wire in a wire transport system, the fluctuation recording unit that records the physical amount measured by the tension measuring unit, the fluctuation analysis unit that obtains an average value, variation, and frequency analysis data of the recorded physical amount as an analysis result of the physical amount, the maintenance necessity determining unit that compares the analysis result with a reference value and determines whether maintenance is needed based on a comparison result and the display unit that displays a determination result are included, and it is made possible to accurately determine the time for maintenance for various components used in the wire transport system without using a measuring instrument.

Abstract: An electric discharge machine includes a machining power supply for applying a voltage to a machining gap between a machining electrode and its opposite workpiece and detecting a contact between the machining electrode and the workpiece. The machining power supply includes a first power supply circuit whose output voltage is equal to or less than an arc voltage, a second power supply circuit for supplying a pulse current to the machining gap, and a control unit. When the first power supply circuit detects a contact between the machining electrode and the workpiece, the control unit operates to supply a pulse current from the second power supply circuit to the machining gap while the machining electrode and the workpiece are in contact with each other.

Abstract: The invention relates to a wire electrode for spark-erosion cutting. The wire electrode comprises a core made of more than 50% by weight pure crystalline aluminum and/or one or more crystalline aluminum alloys, and comprises a coating layer encompassing the core and comprising copper, zinc, and/or a copper-zinc alloy. The proportion of the surface area of the core relative to the total cross-sectional area of the wire electrode is in the range from 60% to 95% along the entire length of the wire electrode.

Abstract: A wire electric-discharge machining device includes a control unit that selects a cutting wire to which a pulse voltage is applied by a pulse-voltage generation unit on a basis of an angle formed between an end face of a workpiece and a plane including a plurality of cutting wires, which are not parallel to the end face, an interval between parallel cutting wires, and a relative distance between the cutting wires and the workpiece. A drive unit drives a workpiece in a direction not vertical to the plane including the cutting wires, and the workpiece is cut by electric-discharge machining by applying a pulse voltage.

Abstract: A wire-electrode removing device in a wire electric-discharge machining device includes a wire-electrode guide unit that has a through hole into which a wire electrode in a vertical direction is inserted at the time of electric-discharge machining using the wire electrode and guides an end on a cut point side of the wire electrode outside a running path, with the cut wire electrode arranged in the through hole, by rotationally moving about a wire-electrode guide shaft in an operation of removal of the wire electrode cut by wire-electrode cutting devices; a winding shaft unit that winds and removes the wire electrode on the cut point side guided by the wire-electrode guide unit; and a collection member that collects the wound wire electrode.

Abstract: A wire aspiration device includes a first member having a first curved surface with a projected portion that is in close contact with peripheral surfaces of first and second recovery rollers on one side, a second member having a second curved surface with a projected portion that is in close contact with the peripheral surfaces of the first and second recovery rollers on the other side, and a third member having a through hole formed in a central portion thereof to cause the ejected wire electrode to run in the wire-electrode recovering direction and coupling the first and second members to form two grooves between the first and second curved surfaces to be in contact with the through hole, wherein a fluid spout for spouting a fluid into the through hole in the recovering direction is formed in any of the first, second, and third members.

Abstract: A wire electric discharge machine for taper cutting includes a table on which a workpiece is mounted, at least two linear axes for moving the workpiece and a wire electrode relative to each other, a mount portion capable of being mounted on the table, and a control unit. The workpiece can be attached to the mount portion, and the mount portion has at least two rotary axes. The control unit synchronously moves the linear axes and the rotary axes in accordance with a machining program to perform machining while relatively changing the tilt of the workpiece with respect to the wire electrode.

Abstract: A wire electrode for cutting by electrical discharge machining may include a core and a covering. The core may include a metal or a metal alloy. The covering may surround the core and may include one or more covering layers, of which at least one contains a mixture of phases including at least one of ? or ?? brass and including ? brass. In the at least one covering layer that contains the mixture, the phases are present next to one another in a fine-grained microstructure having a mean grain size of 5 ?m or less in section perpendicular to the longitudinal axis of the wire electrode.

Abstract: A wire electrode is hung from an upper die guide of a wire electric discharge machine toward a workpiece, a distance from a position where the wire electrode on the top surface of the workpiece is hung down to a top end position of a machined groove formed by the electric discharge machining is calculated based on a commanded taper angle and the distance from the top surface of the workpiece to an upper die guide fulcrum position of the upper die guide, and automatic wire connection is performed by moving an upper nozzle by the calculated distance. In this way, a wire connecting operation can be performed in the vicinity of the tapered groove.

Abstract: In a taper machining using a wire electric discharge machine, a difference between a target tension value and an actual tension value of a wire electrode is fed back to a controller to determine input current values to a wire electrode feed motor and a wire electrode deliver motor, thereby adjusting the tension value of the wire electrode. When the taper angle of the wire electrode exceeds a given value, the control gain of the tension of the wire electrode for determining the input current value to the motor is lowered to prevent the wire electrode from oscillating.

Abstract: The wire electric discharge machine determines whether machining is submerged machining or flushing machining. If the machining is the submerged machining, when a fluid level of working fluid is lower than a predetermined height, the wire electric discharge machine prohibits a machining power from being applied. Thus, it is possible to prohibit the machining power from applied in a state in which the working fluid is insufficient and the submerged machining cannot be appropriately performed, thereby preventing an electric shock due to contact with a wire electrode and machining parts of a workpiece and preventing the working fluid from scattering to the air, and improving safety.

Abstract: On a wire guide supporting face of a wire guide supporting part which supports a wire guide of a wire electric discharge machine, two wall faces which are orthogonal to the wire guide supporting face are formed to be arranged in a V shape. On the other hand, two planar parts which are abutted on the two orthogonal wall faces, which are arranged in the V shape, of the wire guide supporting part are formed on the wire guide. Then, the wire guide is fixed on the wire guide supporting part with a screw in a state in which the two orthogonal wall faces of the wire guide supporting part and the two planar parts of the wire guide are respectively abutted on each other.

Abstract: Based on a discharging gap value and machining allowance value stored in a corner-control-information storing means 20, a speed-ratio calculating means 23 being a machining-volume calculating means calculates machining volumes of a straight line portion and a corner portion to calculate a volume ratio therebetween. A corner-portion-speed calculating means 24 calculates a machining feed speed at the corner portion based on a volume ratio calculated by the speed-ratio calculating means 23, and then outputs to a servo amplifier 8 on the basis of the length of a pre-corner section outputted by a pre-corner-section calculating means 21 and the length of a post-corner section outputted by a post-corner-section calculating means 22, instructions about machining feed speeds from entering the pre-corner section till getting out of the post-corner section.

Abstract: Disclosed are an electrode wire for electro-discharge machining and a method for manufacturing the same. The electrode wire includes a core wire including a first metal including copper, a first alloy layer formed at a boundary region between the core wire and a second metal plated on an outer surface of the core wire due to mutual diffusion between the core wire and the second metal, and a second alloy layer formed due to diffusion of the first metal to the second metal. A core wire material is erupted onto a surface of the electrode wire for electro-discharge machining, which includes the core wire, the first alloy layer, and the second alloy layer, along cracks appearing on the second alloy layer, so that a plurality of grains are formed on the surface of the electrode wire.

Abstract: Two contact detection jigs are spaced apart and attached on a table on which a workpiece to be machined by a wire electric discharge machine is placed, and first, under a state serving as a reference, a distance between these two contact detection jigs (a reference distance) is measured by bringing the wire electrode into contact with these contact detection jigs. Subsequently, in a state of actual use, the wire electrode is brought into contact with these contact detection jigs in the same manner, so that a distance between these two contact detection jigs (an actual distance) is measured. Then, based on the difference between the reference distance and the actual distance, the amount of compensation is obtained to compensate an instruction for moving the wire electrode with respect to the table.

Abstract: Methods and apparatus of an improved cooling structure having cooling passages are provided. A method includes forming pilot holes with an electrical discharge machine (EDM) drill near a heated flow surface. The pilot holes are then shaped with a wire EDM into cooling passages having a desired shape.

Abstract: Polycrystalline diamond includes cubic diamond and hexagonal diamond, and a ratio of X-ray diffraction peak intensity of a (100) plane of the hexagonal diamond to X-ray diffraction peak intensity for a (111) plane of cubic diamond is not lower than 0.01%. In addition, a present method of manufacturing polycrystalline diamond includes the steps of preparing a non-diamond carbon material having a degree of graphitization not higher than 0.58 and directly converting the non-diamond carbon material to cubic diamond and hexagonal diamond and sintering the non-diamond carbon material, without adding any of a sintering agent and a binder, under pressure and temperature conditions at which diamond is thermodynamically stable.

Abstract: While machining is carried out according to a machining program by an electric discharge machine, the pressures of a machining fluid supplied from upper and lower nozzles are detected and displacement amounts of upper and lower wire guides are obtained from the detected pressures. Further, positional compensation values of the upper and lower wire guides are calculated on the basis of the obtained displacement amounts, and command values of the machining program are compensated on the basis of the calculated positional compensation values.

Abstract: In a corner portion formed at an intersection of a first block to be machined first and a second block to be machined second, an end point of the first block is extended. Then, after moving from the first block to the extended end point of the first block, a wire electrode of an electrical discharge machine returns to an end point of the original block (an end point of the original first block and a start point of the original second block) therefrom along the same path as before, and machines the second block therefrom.

Abstract: A wire electric discharge machine corrects a machining route according to an angle between two moving blocks that form a corner portion. A correction distance and a return distance are computed based on a detected corner angle. The correction is implemented so that an end point of a block to be machined first is extended according to the correction distance, and a portion extending from a start point of a block to be machined subsequently to an intermediate point of this block is removed according to the return distance. A machining route is created so that the end point of the new block created by the extension is connected to the start point of the other block created by the removal, and the wire electrode is moved along the machining route relative to a workpiece.

Abstract: In a wire electric discharge machine in which chuck part electrodes that hold a wire electrode are provided on the upper side of an upper wire guide and electrodes of a detecting part are provided on a lower stream side of the chuck part electrodes, a part, which contacts with the chuck part electrodes, of a surface of the wire electrode is hardened by locally cooling down the part by air blowing during energization to the wire electrode. Accordingly, wire metal powder is hardly generated from the wire electrode even though the wire electrode rubs against the chuck part electrodes.

Abstract: A corrosion preventing apparatus including: a water purifying part that includes a hydrogen-ion form resin and a hydroxy-ion form resin; an anticorrosive part that includes a cation form resin and an anion form resin having anticorrosive ions supported thereon; a conductivity measuring part that measures a measured value of conductivity of a machining liquid; and a control part that controls a flow of the machining liquid to the water purifying part and the anticorrosive part on the basis of the conductivity measuring part; wherein the control part performs control on the basis of predetermined first and second conductivities and the measured value measured by the conductivity measuring part.

Abstract: Polycrystalline diamond includes cubic diamond and hexagonal diamond, and a ratio of X-ray diffraction peak intensity of a (100) plane of the hexagonal diamond to X-ray diffraction peak intensity for a (111) plane of cubic diamond is not lower than 0.01%. In addition, a present method of manufacturing polycrystalline diamond includes the steps of preparing a non-diamond carbon material having a degree of graphitization not higher than 0.58 and directly converting the non-diamond carbon material to cubic diamond and hexagonal diamond and sintering the non-diamond carbon material, without adding any of a sintering agent and a binder, under pressure and temperature conditions at which diamond is thermodynamically stable.

Abstract: In the present disclosure, the high-pressure chamber includes a chamber main body including a flat rectangular parallelepiped block of a metal which is formed with a flat cavity that serves as a substrate processing space in which a processing using a high-pressure fluid is performed on a substrate, and the substrate processing space being formed by machining the block from one of faces of the block other than the widest face towards another face opposing thereto. In a case where the cavity is constituted as a through hole, the though hole is provided with a cover configured to open or close the cavity on one side of the through hole, and a second block configured to air-tightly seal the cavity on the other side.

Abstract: In order to detect a wire breakage as soon as possible, the wire electrical discharge machining apparatus includes a speed fluctuation compensator that generates a speed fluctuation suppression command that is a speed compensation value that suppresses fluctuation of the rotational speed of the tension motor on the basis of the rotational speed of the tension motor and a breakage detecting device that detects a breakage of the wire electrode on the basis of a comparison of a preset breakage detection threshold and a speed fluctuation suppression command output from the speed fluctuation compensator.

Abstract: In order to detect a machining state of a wire electric discharge machine, the state of a machining gap is classified into three categories; an open-circuit state in which electric discharge does not occur after a first predetermined level is reached or surpassed by a machining-gap voltage, an electric discharge state in which electric discharge occurs after a second predetermined level is reached or surpassed by the machining-gap voltage, whereby the machining-gap voltage becomes lower than the second predetermined level, and a short-circuit state wherein a third predetermined level is not reached or surpassed by the machining-gap voltage. An average voltage in the machining gap is determined based on voltages in these states and the number of cycles of voltage application to the machining gap, number of open-circuits, number of discharges, and number of short-circuits per unit time.

Abstract: A sealing mechanism is disposed in a lower-arm insertion portion of a working tank of a wire-cut electric discharge machine, and a pre-sealing unit is attached to the sealing mechanism. The pre-sealing unit includes bellows unit and partition unit which surrounds the sealing mechanism from within the working tank. Further, a supply pipe formed with a plurality of openings directed to the sealing mechanism is located at the upper part of the bellows unit, and a working fluid is introduced into the pre-sealing unit through the openings of the supply pipe.

Abstract: In carrying out electric discharge machining of a graphite or carbon-composite workpiece by a wire electric discharge machine, a voltage lower than that used in machining a metal workpiece by the wire electric discharge machine is supplied to a machining gap. Further, the peak value and the pulse width of a total discharge current flowing from a power supply device for electric discharge machining to a wire electrode are adjusted within ranges of 30 to 150 amperes and 0.3 to 6.4 microseconds, respectively.

Abstract: An apparatus on an integrated circuit, and method thereof, provides a real-time flexible interface between inputs from a vehicle components and outputs to the vehicle control components. The functions comprises of a programmable interconnection matrix, engine sensors and a control interface. Both engine sensors and control functions comprise of fixed hardwired functions and a customization hardware area. The apparatus therefore provides means for flexible powertrain events control target for the next generation of low-polluting power trains of vehicles.

Abstract: In a discharge pulse current introduced into a machining gap between a wire electrode and a workpiece, ineffective discharge pulses not contributing to machining are discriminated and the number of the ineffective discharge pulses is counted. Moreover, an electrical discharge position is detected. An unevenly distributed state of machining chips in the machining gap is discriminated based on the counted number of the ineffective discharge pulses and the detected electrical discharge position. In order to eliminate the unevenly distributed state of the machining chips based on the unevenly distributed state of the machining chips, a flow rate of a working fluid supplied from an upper working fluid feeder in an upper wire guide and a flow rate of a working fluid supplied from a lower working fluid feeder in a lower wire guide are adjusted.

Abstract: Provided are a heat sink material made of an alloy or a composite material including two or more types of elements which has an end surface that makes possible formation of an edge portion on which at least a laser element is mounted, a manufacturing method for the same, and a semiconductor laser device including the heat sink material. A heat sink material (10) is made of an alloy or a composite material including two or more types of elements, and provided with a main surface having a relatively large area and a secondary surface having a relatively small area which crosses the main surface, and the secondary surface includes a surface on which a discharging process has been carried out using a discharge wire (200) that is placed approximately parallel to the main surface.

Abstract: By utilizing a function of automatically selecting an automatic wire-connection parameter of a wire electric discharge machining apparatus, a default cutting condition is read, a cutting process is executed, and a wire-connection process is executed. As a result, when the wire connection is successful, the process in an automatic wire connection mode is ended. On the other hand, when the wire connection is unsuccessful, it is determined whether or not a parameter set selected by executing a cutting condition automatic selection process is adopted as a new default cutting condition. When the selected parameter set is adopted as the new default cutting condition, the selected parameter set is stored as the new default cutting condition, and the automatic wire connection mode is ended.

Abstract: A method for fabricating a quadrupole mass filter (QMF) or quadrupole ion trap (QIT) capable of generating a hyperbolic electric field. The method comprises: (a) cutting four elongate erodible metal workpieces axially at opposing extremities; (b) parallel mounting the four elongate erodible metal workpieces axially in an elongate slot in an insulating housing in a mutually spaced apart disposition such that an axial bore is formed therebetween whereby a first part of each elongate erodible metal workpiece is freely inward facing and the cutting forms a recess remote from the axis of the insulating housing; (c) electrically connecting the erodible metal workpieces; and (d) generating electrical discharges between the erodible metal workpiece and a wire electrode as the wire electrode passes through the axial bore to erode the erodible metal of the first part of the erodible metal workpiece to a hyperbolic profile.

Abstract: An object is to enable highly accurate machining by correcting machining conditions by referring to a programmed trajectory to obtain a desired machining shape. A wire electric discharge machining apparatus includes a machining-condition correcting unit that corrects machining conditions in each machining stage corresponding to a circular arc radius of a portion corresponding to a corner portion of a programmed trajectory, in the corner portion formed by changing a direction of relatively moving a wire electrode, when the wire electrode is moved on a wire center trajectory, which is offset from the programmed trajectory prestored in order to obtain a desired machining shape to perform finish machining in each machining stage with an offset amount being changed.

Abstract: A machining program used for machining a workpiece with a wire-cut electric discharge machine is used for measuring a shape of the workpiece. A wire electrode moved in a direction away from the workpiece by an offset command for machining is moved close to the workplace in workplace measurement after the machining. In other words, the wire electrode is moved in an opposite direction to an offset direction for the machining. Then, an end face position of the machined workpiece detected by a position of the wire electrode when the wire electrode comes in contact with the workpiece.

Abstract: The wire electric discharge machine comprises a machining power source with variable output voltage, a first power supply path through which a discharge pulse current is supplied from the power source by applying a voltage at machining gap to cause electric discharge, and a second power supply path through which a wire electrode cutting current is supplied from the power source to the wire electrode, and also comprises a switching device to switch the first and second power supply paths. Discharge pulse current is supplied through the first power supply path when machining the workpiece, whereas wire cutting current is supplied when cutting the wire electrode.

Abstract: In a wire electric discharge machine or an automatic programming device for a wire electric discharge machine, in which a core is held with a workpiece base material by attaching brass contained in a wire electrode to the machining groove during machining, an attachment/deposition region where machining chips containing brass produced during machining are attached and deposited to the workpiece is set based on a machining shape obtained from a machining program and the machining chips containing brass produced during machining are attached and deposited according to the set attachment/deposition region.

Abstract: A machine tool for separative machining of preferably plate-like workpieces, for example, metal sheets, has a workpiece support and a discharge device on the workpiece support. The discharge device discharges workpiece parts produced as products of the separative machining. The discharge device includes two opening sections are adjustable relative to one another in the horizontal Y direction to form a through-opening for discharge of workpiece parts. The opening sections are adjustable into different positions relative to one another in the horizontal Y direction, to form through-openings of different widths for discharge of workpiece parts.

Abstract: A mechanism in a wire electrical discharge machining apparatus for machining a workpiece by electrical discharge between a wire and the workpiece is disclosed. The mechanism includes a processing fluid bath configured to store processing fluid used for electrical discharge machining between the workpiece and the wire, a processing fluid supply port to communicate with the processing fluid bath and supply the processing fluid into the processing fluid bath from a processing fluid supply apparatus supplying the processing fluid, and a stream control mechanism to suppress a stream of the processing fluid supplied from the processing fluid supply port into the processing fluid bath in the direction of the water surface of the processing fluid in the processing fluid bath.

Abstract: In a wire electrical discharge machining apparatus, an upper main-discharge power supply is connected between an upper conducting terminal and a workpiece using an upper main-feeder line capable of configuring outward and homeward paths, and a lower main-discharge power supply is connected between a lower conducting terminal and the workpiece using a lower main-feeder line capable of configuring outward and homeward paths. Moreover, a sub-discharge power supply is connected between the upper conducting terminal and the workpiece and between the lower conducting terminal and the workpiece using an upper and a lower sub-feeder lines that have higher impedances than the impedances of the upper and the lower main-feeder lines and can configure outward and homeward paths.

Abstract: An automatic wire connecting device includes a heating electrode that heats an electrode wire by applying a current to the electrode wire, a tension applying unit that applies a tension to the electrode wire to which the current is applied by the heating electrode, a tension control unit that controls the tension applied by the tension applying unit, and a power supply control unit that applies a heating current smaller than a preset annealing current to the electrode wire until a first set time elapses since the current starts to be applied and increases the current applied to the electrode wire to reach the annealing current during a second set time after the first set time elapses since the current starts to be applied.

Abstract: The present invention provides a mechanism capable of decreasing wires which are not appropriately supplied with power and performing the electrical discharge machining high in uniformity between multiple wires. A wire electrical discharge machining system configured to slice a workpiece at an interval of wires arranged side by side at equally spaced intervals causes the wire to travel in the same direction and includes a power feed contact configured to collectively supply a machining power supply to a plurality of the traveling wires, in which two adjacent power feed contacts respectively come into contact with the plurality of the wires supplied with the machining power supply and arranged without being aligned in the direction vertical to the direction in which the wire travels.

Abstract: A contact detection apparatus for a wire electrical discharge machine includes a voltage application unit adapted to apply a detection voltage to detect contact between a wire electrode and a workpiece; a contact determination unit adapted to determine contact or non-contact between the wire electrode and the workpiece based on changes in the detection voltage applied by the voltage application unit; and a voltage value changing unit adapted to change a voltage value of the detection voltage applied by the voltage application unit.

Abstract: A wire electric discharge machine is provided with an automatic wire-connection pipe movable between an automatic wire connection position and a retracted position. A pickup unit configured to clamp a wire electrode to be cut is disposed below a wire cutting electrode on the outlet side of the automatic wire-connection pipe. The wire electric discharge machine is further provided with a stopper mechanism configured to regulate a movement of the automatic wire-connection pipe so that a distal end of a nozzle of the automatic wire-connection pipe is located between the wire cutting electrode and the pickup unit when the wire electrode is cut.

Abstract: In order to produce a wire electrode having a core consisting of a copper/zinc alloy and to produce a specific sheath layer, the sheath layer is coated onto the core at a temperature at which no diffusion occurs. The wire electrode is subsequently heated at a heating speed higher than 10° C. per second, briefly annealed at temperatures above 500° C. and subsequently cooled again very rapidly at cooling speeds higher than 10° C. per second.