Abstract: In wire-cut electrical discharge machining apparatuses that simultaneously perform a plurality of cutting processes by engaging a wire between main guide rollers at a plurality of times, a wire-cut electrical discharge machining apparatus is provided that suppresses vibrations at cutting wire sections, to enable the cutting processes under steady-state accuracy. In addition to the main guide rollers, vibration-damping driven guide rollers or vibration-damping guides are included which form a plurality of cutting wire sections where the vibrations are suppressed by guiding the wire into place, and the positions of the cutting wire sections are thereby defined with respect to nozzles.

Abstract: Provided is a wire electrical discharge machining device which has a tension controller for maintaining the tension of a traveling wire electrode at a tension. The tension controller includes: an allowed tension calculation module for determining an allowed tension that is less than a wire breaking tension at which the wire electrode breaks; and a set tension generation module for generating the set tension in accordance with the allowed tension. When the set tension is greater than the allowed tension, the set tension generation module reduces the set tension. When the set tension is less than the allowed tension, the set tension generation module increases the set tension in such a way that the set tension does not exceed the allowed tension.

Abstract: Disclosed herein is a multi-wire electrical discharge machining system for slicing a workpiece into a thin leaf at intervals of a plurality of wires arranged together causes the plurality of wires arranged together to travel in the same direction and includes a power feed contact configured to collectively comes into contact with the plurality of the traveling wires, a machining power supply portion configured to supply a machining power supply to the power feed contact, and an electrical discharge portion configured to electrically discharge a machining power supply in which the plurality of the traveling wires comes into contact with the power feed contact to collectively supply power to the plurality of the traveling wires to the workpiece, in which a resistance between the machining power supply portion and the power feed contact is smaller than a resistance between the power feed contact and the electrical discharge portion.

Abstract: A stabilization device for bones or vertebrae comprises a substantially cylindrical elastic element. The elastic element has a first end and a second end opposite to the first end. An elastic section extends between the first end and the second end. The elastic section includes at least first and second helical coils. The first and second helical coils are arranged coaxially so that the first helical coil extends at least in a portion between the second helical coil. The elastic element may form, for example, a portion of a rod, bone anchoring element, or plate.

Abstract: A wire guide housing (1) which contains a wire guide (6) for supporting a running wire electrode (W) and in which a wire running passage (32, 23b, 41, 26, 63, 66a) through which the wire electrode passes is formed. The wire guide housing includes: a cleaning liquid supply opening (43), for introducing a cleaning liquid (C) into the wire guide housing; a cleaning liquid discharge opening (44), for discharging the cleaning liquid from the wire guide housing; a first flow passage (46), for connecting the cleaning liquid supply opening to the wire running passage; and a second flow passage (48), for connecting the wire running passage to the cleaning liquid discharge opening. The cleaning liquid flows into the wire running passage at a side more upstream than the wire guide.

Abstract: A wire electric discharge machining apparatus for machining a workpiece (7) by supplying current pulses to a work gap formed between a wire electrode (8) and the workpiece comprises a person detection sensor (10) for generating a person detection signal (EX) when the existence of a person is detected, and an NC device (20) that is configured to receive the person detection signal. When the NC device receives the person detection signal, it selects first machining conditions which improve machining speed. When the NC device does not receive the person detection signal, it selects second machining conditions which reduce the risk of wire breakage.

Abstract: A wire electrical discharge machine includes an approach control unit. The approach control unit relatively moves a wire electrode with respect to a workpiece while inclining the wire electrode within a plane parallel to the machining surface to which the wire electrode approaches, in an approach section where the wire electrode performs cutting machining on the machining surface of the workpiece.

Abstract: The invention concerns an electrode wire comprising a metal core coated with a zinc surface cladding whereof the thickness ranges between 2 and 4 ?m, thereby providing a better compromise between machining speed, precision of workpieces and surface condition of the machined workpieces.

Abstract: A wire electric discharge machine has a function for controlling the machining liquid temperature. When it is predicted that the machining liquid temperature rises linearly, the machining liquid begins to be warmed at time t5b to reach machining liquid control temperature T2 at human operation beginning time t2. If the temperature rise at predetermined later time t8 is greater than predicted, temperature rising suspended from time t8 to a later time t9. Temperature rising resumed at time t9. This allows the machining liquid temperature to reach the machining liquid control temperature T2 without wasting electric power.

Abstract: When contact between a wire electrode and a workpiece is detected while, after wire electric discharge machining is ended, the wire electrode is moved (retraced) in the direction opposite to the machining direction along the machining path, the movement of the wire electrode is stopped. The wire electrode is moved in the offset direction from the contact position. When the wire electrode and the workpiece are brought into a non-contact state, the non-contact state is detected, and the movement of the wire electrode is stopped. The wire electrode is returned from the non-contact position to the machining path, and the wire electrode is retraced along the machining path in the state where the detection of contact between the wire electrode and the workpiece is neglected. Then, an amount of distortion of the workpiece is calculated from the contact position and the non-contact position.

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: To provide a wire electrode removal device of a wire electric discharge machine, the wire electrode removal device including a wire-electrode guide unit that guides an end on a cut point side of a wire electrode cut by wire-electrode cut devices to outside of a running path, a rewind shaft that pressure-fixes the wire electrode on the cut point side guided by the wire-electrode guide unit with an end face thereof and rewinds the wire electrode on a columnar member having angular portions with subsequent rotational driving thereof, a rewind-shaft drive unit that drives the rewind shaft to perform pressure fixing or pressure releasing of the wire electrode with the rewind shaft, a scraper member that removes a wound wire electrode from the columnar member at a time of pressure releasing of the rewind shaft by the rewind-shaft drive unit, and a collection member that collects the removed wire electrode.

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: A method for cutting by a traveling wire, wherein the wire traveling direction of the wire and/or the workpiece are/is inclined alternately in relation to one another into at least two different specific angular positions in the cutting direction, with the result that the effective cutting height (s) on the workpiece (2) becomes smaller than the entire workpiece height.

Abstract: A method of recovering a bonding apparatus from a bonding failure to resume a normal operating state for semiconductor chip fabrication is disclosed. The bonding apparatus comprises: i) a bonding tool for bonding a wire between a semiconductor chip and a substrate; and ii) a position sensor. Specifically, the method comprises the steps of: a) the position sensor determining a position of the bonding tool when the bonding tool contacts a surface to bond the wire to the substrate; b) the bonding apparatus detecting a bonding failure caused by detachment of the semiconductor from the substrate based on the position of the bonding tool; and c) the bonding apparatus detaching the semiconductor chip from the wire.

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: A method for efficiently machining magnets with curved surfaces is disclosed. The use of machining equipment capable of making curved cuts through magnetic material can allow significant cost and material savings, particularly when machining magnets with complementary surfaces. A process for using a series of cutting wires to simultaneously cut magnetic material into conformally shaped magnets is described.

Abstract: A method of cutting out a part from a workpiece with making partially welded spots in wire electrical discharge machining to keep the part against falling apart away from the workpiece. There is no need to cut anew the welded spot left as in the conventional process. The cut-out parts are cut off at a time after breakage of the welded spots caused by an external impact. The electric processing condition applied across an inter-electrode space between the wire electrode and the workpiece is changed from a cutting phase to a welding phase in which the wire electrode is fused partially at some spots along a cutting path of a predetermined contour on the workpiece to weld together the cut-out part and the workpiece at the fused spot on the wire electrode.

Abstract: A wire electric discharge machine (WEDM) and method of cutting a work piece. The WEDM having a movable support plate for supporting one or more work pieces thereon and for moving one or more work pieces into the proper position for a cutting operation. Process information is recorded and compared to predetermined operating parameters and tolerances to determine deviations therefrom and adjustments are automatically made to the cutting operation to correct such deviations.

Abstract: A drive device for erosion tools, having a drive shaft, an electrode holder connected to the drive shaft, an axial drive which works on the drive shaft, a rotational drive which works on the drive shaft as a direct drive in a contactless manner, and a radial bearing. The radial bearing is constructed as a ball track.

Abstract: A wire material having a copper-zinc alloy layer, which is formed by action of thermal diffusion, and a zinc layer on its circumference surface is subjected to processes, including from a step of drawing the wire material to a step of reducing the diameter of the product, to reliably crash the copper-zinc alloy layer into particles. The particles are embedded in the circumference surface of a core to integrate the diffusion alloy layer and zinc layer with the core and prevent the diffusion alloy layer and zinc layer from falling off from the core. In addition, in order to cover cracks formed in the copper-zinc alloy layer during wire drawing with a zinc thin film, wire drawing is performed at temperatures appropriate for maintaining good malleability and ductility of zinc.

Abstract: An apparatus on an integrated circuit 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: An electrode wire for use in an electrical discharge machining apparatus includes a core having a surface and one of a metal, an alloy of a metal, and a combination of a metal and alloy of a metal. An adherent coating of graphite is metallurgically bonded to the surface of the core.

Abstract: A power supply system for wire electric discharge machining includes a first power supply circuit and a second power supply circuit. The first power supply circuit applies, to the machining gap, a voltage that induces a discharge. The second power supply circuit, which includes a low inductance line, supplies a current, which contributes to the machining, to the machining gap. A blocking diode is series-connected between the low inductance line and the machining gap. A container, which has a contact surface contacting with the blocking diode and contains a cooling liquid, is provided.

Abstract: In a torque motor driving device for wire cut electrical discharge machines, a voltage waveform rectified by a full-wave rectifying circuit, not using a high-capacitance electrolytic capacitor, is applied as an AC voltage to a single-phase torque motor by a bridge circuit including semiconductor switches. A PWM signal whose duty is adjusted so that the current flowing through the torque motor matches an instructed value is generated and the generated PWM signal is used for the operation of the bridge circuit.

Abstract: The present invention relates to a method of machining a master link disposed at a distal end of a chain and constituting a part of a track chain link of a lower driving device used in an endless track vehicle (a bulldozer, an excavator). According to the present invention, it is possible to rapidly perform the machining work by secondarily adjusting the horizontal degree and the vertical degree of the integrally manufactured front and rear master link in a short time after primarily wire cutting it by using an exclusive clamping jig for the primary wire cut and an exclusive clamping jig for the secondary machining center, and machine the interference portion generated at the time of the assembly of the master link with the corresponding product, by using the machining center provided with the ball end mill, the flat end mill, and the chamfer end mill, in a short time, thereby achieving reduction of the machining time, maintaining the uniform quality and reduction of the production expense.

Abstract: A photon collimator, suitable for use in medical imaging equipment, is constructed from a block of photon-attenuating material, such as solid tungsten or molybdenum alloy that defines a plurality of integrally formed septa slats. Each slat has an elongated length dimension greater than thickness and depth dimensions, and is oriented in an opposed pattern array that is laterally spaced relative to its respective thickness dimension. An aperture channel is defined between each pair of opposed slats. Rows of integrally formed slats in one block or separately affixed blocks may be stacked on each other at skewed angles to form two-dimensional grids of apertures having polygonal cross sections. The slats may be formed by electric discharge or laser thermal ablation machining, such as by a sequential passing of an EDM wire cutting head along the pattern array, repeating sequential cutting of respective channel depth and width.

Abstract: A micro spherical stylus manufacturing machine comprises a clamp, a moving unit, a wire supply unit, a wire retrieving unit, an insulating roller, a conducting wire body, a discharging unit, and a loading unit. The clamp is used to hold a circular-shaped electrode, and the loading unit is used to carry a micro sphere, and the insulating roller is positioned at one side of the clamp. The micro spherical stylus manufacturing machine can fabricate a micro electrode tool on the same platform, and then form a micro spherical stylus for a micro coordinate measuring machine by a gluing process.

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: A workpiece retainer retains a workpiece at a time of a cutting process by a wire electric discharge machining device that cuts a workpiece by electric discharge from wire electrodes that are spaced from each other and are arranged in parallel. The workpiece retainer is formed with a fitting portion, into which the workpiece is fitted substantially without any gap, and has an external shape such that at a time of cutting the workpiece retainer together with the workpiece fitted in the fitting portion, a length along the wire electrodes of a portion where the workpiece retainer and the workpiece face the wire electrodes becomes substantially constant during the cutting process of the workpiece.

Abstract: The invention relates to a wire (1) which comprises a copper or pinchbeck core (2) surrounded by a pinchbeck coating consisting of a continuous pinchbeck sub-layer (3) in phase ? and a superficial layer (4) with a fractured pinchbeck structure in phase ? enabling the appearance of pinchbeck in phase ? in the fractures (5a). In this way, the electrical discharge machining speed is essentially increased.

Abstract: The electrode wire according to the invention comprises a brass core (1) covered with a ? phase brass coating (2) having a structure fragmented into blocks (2a) between which the core (1) is exposed. The blocks (2a) have a thickness (E2) with a narrow distribution and produce a coverage of the core (1) according to a coverage rate greater than 50%. This produces a regular fragmentation of the coating, which improves the finish state of the machined parts.

Abstract: An electrical discharge machining apparatus includes a machining electrode that is one wire and includes a plurality of opposing sections with respect to a workpiece by being wound around a plurality of guide rollers, driving units that change a relative distance between the workpiece and the opposing sections, and a plurality of pulse generating units that apply electrical discharge machining pulses between the workpiece and the opposing sections, respectively, in which the pulse generating units are controlled such that application start times of electrical discharge machining pulses for adjacent opposing sections do not coincide with each other.

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 feed control method for wire cutting electrochemical discharge machining is disclosed. The method determines whether a contact event has occurred using a wire electrode, based on variations in wire tension when being cut. A wire is cut with an ideal feed speed when the wire electrode is not in contact with a workpiece.

Abstract: An apparatus for making bores in a turbine blade edge is provided. The apparatus includes a drilling device and a guide for the drilling device. The guide includes a bearing element with a gap which is delimited by bearing faces and has the shape of a turbine blade edge. Further, the apparatus includes two guide modules which lie opposite one another and are brought to bear with a side face of the turbine blade and which together form a tension device for fixing the guide on the turbine blade. Furthermore, a method for making bores in a turbine blade edge using such an apparatus is provided.

Abstract: Cutting device for spark-erosion machine wires in which, after passing through a machining region, the wire-electrode is cut up into sections which are disposed of as waste products into a recovery receptacle. The device comprises electrical contacts connected to a voltage/current source. The wire is subjected to a dielectric fluid whose flow rate is sufficiently high to generate a turbulent flow regime and cause random lateral movements of the wire which sporadically brushes against the contacts.

Abstract: A method and apparatus for fabricating an orthopaedic prosthetic component includes rotating the orthopaedic prosthetic component and operating an electrical discharge machining cutting tool (EDM) to move a wire electrode of the EDM along an arcuate path. A spark is generated between the wire electrode and the orthopaedic prosthetic component to remove a portion of the orthopaedic prosthetic component.

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: The liquid-quality adjusting apparatus of the present invention includes: a water purifying part that deionizes a machining liquid; an anticorrosive part that exchanges ions in the machining liquid with anticorrosive ions; a conductivity measuring part that measures a measured value of conductivity of the machining liquid; a storage part that stores in advance a first reference value and a second reference value which are an upper limit value and a lower limit value of conductivity applicable to machining, respectively, and a third reference value which is between the first reference value and the second reference value; and a control part that performs control on the basis of the reference values stored in the storage part and the measured value of the conductivity of the machining liquid measured by the conductivity measuring part.

Abstract: A hot-wire cutter includes a frame, a tank supported on the frame, a first working head located on a floor of the tank, a second working head movably supported on the frame, a supporting unit supported on the frame and used to support an annular work piece, a restraining unit supported on the frame and used to clamp the annular work piece, and a rotating unit supported on the frame and used to rotate the annular work piece. Thus, a line between the first and second working heads is directed through the centers of initial apertures in the annular work piece, one after another, to facilitate precise processing of sections of the annular work piece corresponding to the initial apertures.

Abstract: Upper and lower wire guides in a wire-cut electric discharge machine are moved until a wire electrode contacts with a workpiece, and after the contact, the upper and lower wire guides are moved backward to a position A which is away from the contact point at a fixed distance. Then, the upper wire guide is moved until the wire electrode contacts with the workpiece and the upper wire guide is returned to the position A. Subsequently, the lower wire guide is moved until the wire electrode contacts with the workpiece and the lower wide guide is returned to the position A. A coordinate value on the position where the wire electrode contacts with the workpiece is calculated by using position detection values which are obtained in the above respective steps, and board thickness is calculated from the coordinate value.

Abstract: A wire electrical discharge machining apparatus includes a unit capable of separately opening and closing each of a high impedance path and a low impedance path, a unit that sets an open/close pattern in which a combination of closing one of the feeding paths and opening another one of the feeding paths is designated for switching power feeding between the high impedance path and the low impedance path, a unit that changes pulse energy per feeding pulse in a present feeding path to reduce a difference in discharge pulse energy applied to an inter-electrode gap from a machining power supply between at a time of high-impedance-path feeding and at a time of low-impedance-path feeding, and a unit that controls opening and closing of the path open/close unit in accordance with the changed open/close pattern.

Abstract: A wire electric discharge machining apparatus is constructed in such a manner as to include: a wire electrode having a plurality of cutting wire portions that are separated from one another in parallel and are opposed to a workpiece; a machining power supply that generates a pulsed machining voltage; a plurality of power feed contact units that are electrically connected to the cutting wire portions and apply the machining voltage between the cutting wire portions and the workpiece; and a nozzle that ejects machining liquid from an ejection opening toward an electrode gap along the cutting wire portions.

Abstract: A method for controlling a wire electric discharge machine comprising the steps of: determining of at least one predefined contour deviation (Esmax) of a predefined contour to be cut into the workpiece; determining a curvature of at least one geometry element defining at least one section of the contour to be cut into the workpiece; calculating a displacement (s) of an upper guide (WGU) and a lower wire guide (WGL) based on the predefined contour deviation (Esmax) and on the curvature of the at least one predefined geometry element; and setting the displacement (s) by moving the upper guide (WGU) relative to the lower wire guide (WGL) such that the wire electrode guided by the upper (WGU) and lower wire guides (WGL) is inclined in a current cutting direction of the workpiece during cutting of the geometry element into the workpiece.

Abstract: A method and apparatus for fabricating an aspherical orthopaedic prosthetic component includes rotating the orthopaedic prosthetic component and operating an electrical discharge machining cutting tool (EDM) to move a wire electrode of the EDM along a number of arcuate cutting paths. A spark is generated between the wire electrode and the orthopaedic prosthetic component to remove a portion of the orthopaedic prosthetic component.

Abstract: A method of producing at least one through-hole and countersink in at least one ultrahard insert including the steps of providing a body having a first major surface and an opposite second major surface; forming at least one pilot hole in said body using a laser, wherein said at least one pilot hole extends from said first major surface to the opposite second major surface of said body; cutting said pilot hole using a wire electrical discharge machine (WEDM) to produce a straight cylindrical portion and top conical portion; forming a countersink on at least one side of said body using an electrical discharge grinding machine (EDG); and severing said at least one ultrahard insert from said body forming a finished insert, wherein said finished insert includes a through-hole and a countersink.

Abstract: A wire electric discharge machining apparatus includes guide rollers and a single electrode wire that is wrapped around each of the guide rollers to form cut wire portions that are spaced from one another between pairs of the guide rollers. A processing power supply feeds electric power to the individual cut wire portions through a power feed element. A high frequency insulator includes wound coils of the electrode wire that are located between adjacent cut wire portions, and cores which close respective magnetic circuits of the individual coils. The magnetic circuits are magnetically insulated from one another. The power feed element is arranged between the individual cut wire portions and the individual coils, and the individual cut wire portions are insulated from one another at high frequencies by the individual coils. Voltages are impressed on the individual cut wire portions independently, so discharges can be generated simultaneously, in parallel.

Abstract: The present invention relates to a compound electrical discharge machining (EDM) apparatus, which combines a small-hole EDM module and a wire-cut EDM apparatus and hence having the functions of small-hole and wire-cut EDM simultaneously. Thereby, in the compound EDM apparatus, a workpiece can be first processed by the small-hole EDM and subsequently by the wire-cut EDM without repositioning. Accordingly, automatic processing can be achieved. The inability of full automation in wire-cut EDM machines owing to lack of small-hole EDM functionality is improved.

Abstract: A wire electric discharge machining apparatus includes guide rollers and a single electrode wire that is wrapped around each of the guide rollers to form cut wire portions that are spaced from one another between pairs of the guide rollers. A processing power supply feeds electric power to the individual cut wire portions through a power feed element. A high frequency insulator includes wound coils of the electrode wire that are located between adjacent cut wire portions, and cores which close respective magnetic circuits of the individual coils. The magnetic circuits are magnetically insulated from one another. The power feed element is arranged between the individual cut wire portions and the individual coils, and the individual cut wire portions are insulated from one another at high frequencies by the individual coils. Voltages are impressed on the individual cut wire portions independently, so discharges can be generated simultaneously, in parallel.