Abstract: A power supply circuit for a wire electric discharge machining apparatus includes an auxiliary power supply (3) for generating an auxiliary discharge by applying a voltage between a workpiece (2) and a wire electrode (1); and a plurality of main power supplies (4 and 5), a first one of which electrically connected to an upper terminal block (9) for connecting to an upper electrical supply point (6) and a second one of which electrically connected to a lower terminal block (11) for connecting to a lower electrical supply point (7), in order to supply a main discharging current after the auxiliary discharge has occurred; wherein the power supply for the wire electric discharge machining apparatus controls the auxiliary power supply (3) and the plurality of main power supplies (4 and 5), to machine the workpiece (2), and a first end of the auxiliary power supply is connected to the upper terminal block (9) and a second end thereof to the lower terminal block (11).

Abstract: A wire electric discharge machining apparatus that performs an electric discharge machining by applying a pulse voltage between a wire electrode (1) and a workpiece (2), the wire electric discharge machining apparatus including, a machining speed detection unit (14) that detects relative machining speed of the workpiece (2) and the wire electrode (1); a machining energy calculation unit (13) that calculates machining energy of a discharge pulse; a board thickness calculation unit (12) that calculates a board thickness of the workpiece (4) based on the machining speed detected by the machining speed detection unit (14) and the machining energy calculated by the machining energy calculation unit (13); a stationary state determination unit (16) that determines whether the machining is in a stationary state from a machining state during the machining, after the machining condition is switched in accordance with a board thickness of the workpiece (4) calculated by the board thickness calculation unit (12); and a m

Abstract: Provided are a wire electric discharge machining method for poorly conductive materials, such as solar cell silicon, and a semiconductor wafer manufacturing method and a solar battery cell manufacturing method based on the wire electric discharge machining method. Electrical discharge machining of a high volume resistivity, hard and brittle materials, having a volume resistivity that is equal to or higher than 0.5 ?·cm and equal to or lower than 5 ?·cm is performed by applying a pulse voltage having a pulse width that is equal to or higher than 1 ?sec and equal to or lower than 4 ?sec and having a peak current at the time of machining a wire electrode that is equal to or higher than 10A and equal to or lower than 50A to a wire electrode and generating a discharge pulse between the wire electrode and a subject to be machined.

Abstract: The methods and devices enable a reliable and rapid automatic threading process on spark-erosive wire-cutting machines with closed round guides without complicated entry of parameters. A heat-output control device with an optimized output characteristic curve is supplied from a DC voltage source of the erosion generator. Through an at least partial feedback loop of heating current and source voltage, the characteristic curve is modified in such a way that different wire types or different annealing lengths for the wire provide optimal results for stretching, straightening and separating the wire electrode without controlled intervention. With adaptive control it is possible to thread future wire types automatically without reprogramming.

Abstract: A wire-cut electric discharge machine has a cooling device for cooling the machining fluid. A controller for controlling the cooling operation of the cooling device controls the machining fluid temperature by automatically switching, depending on the relationship between the ambient temperature of the wire-cut electric discharge machine and the temperature of the machining fluid, between a fixed temperature control mode in which the machining fluid temperature is maintained at a preset value and a differential temperature control mode in which the machining fluid temperature follows the ambient temperature to limit the difference between the machining fluid temperature and the ambient temperature to a preset range.

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 invention relates to a device and a method for electrical discharge machining of a work piece by means of a working electrode. A sequence of working pulses is applied on the work gap between the working electrode and the work piece. The working pulses comprise eroding pulses for eroding material off the work piece and measuring pulses during which an ignition voltage is applied on the work gap in order to initiate a discharge within the work gap and to measure the corresponding, ignition delay time. The ignition voltage and/or the gap width are adjusted such that the ignition delay time is smaller than an oscillation time of the working electrode oscillating within the work gap due to the electrostatic attraction force and the mechanical restoring force.

Abstract: A wire electric discharge machine includes a wire electrode; a machining power supply that supplies a machining current to between the wire electrode and a workpiece. The machine further includes a first power feed contact and a second power feed contact that respectively feed power to the wire electrode; a first machining-current loop in which a first machining current flows from the first power feed contact toward the workpiece; a second machining-current loop in which a second machining current flow from the second power feed contact toward the workpiece; an impedance switching circuit that is provided in at least any one of the first machining-current loop and the second machining-current loop; and a control unit that controls a flow ratio of the first machining current and the second machining current by changing an impedance of the impedance switching circuit.

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: A machining-energy calculating unit accumulates a discharge current value for each discharge position to calculate a machining energy in a certain time period from the present time to the past time. An energy-distribution changing unit determines the presence or absence of imbalance in the energy by obtaining a machining energy distribution in an up-down direction of the machining gap based on the machining energy, and when there is imbalance, the energy-distribution changing unit produces a new open/close pattern in which a machining energy distribution that eliminates the imbalance. Power feeding is then performed based on the new open/close pattern.

Abstract: Method for manufacturing a machine housing having a fluid chamber (14) with a hardening layer (16) on an internal wall surface, in which the hardening layer (16) is made of a material, that, per-se, is not electrically conductive but has been made conductive by additives, and in that the surface of the hardening layer (16) is machined by electro-discharge machining.

Abstract: A method for machining a workpiece which includes a conductor which carries a time-variable current along its longitudinal axis and is guided by an upper guide and a lower guide. A magnetic field is produced between the guides, the upper guide being located at a distance above the magnetic field and the lower guide at a distance below the magnetic field.

Abstract: A wire electrical discharge machine (WEDM) including a motion platform, a sink, a workbench, a connecting element, a jib, a first head and a second head is provided. The sink is disposed separately above the motion platform, and the workbench is disposed in the sink. The workbench is connected to the motion platform via the connecting element such that the motion platform drives the workbench moving along a first direction and a second direction. Besides, the jib is fixedly connected with the sink, and the first head is disposed inside the sink and connected with the jib. The second head is disposed above the first head. Thus, the jib does not cause relative motion to the sink in order to avoid leaking.

Abstract: For specifying a cause of generation of a water level abnormality alarm in a wire-cut electric discharge machine, stopping supply of a machining liquid to a machining tank when the alarm is generated, draining the liquid; measuring an amount of change in the water level per unit time that is detected by the water level detecting unit; and displaying a question to an operator about the measured amount of change in water level and the state of a water level adjusting mechanism. The operator manually inputs an answer to the displayed question, and specifies, from the answer input by means of the inputting unit, a part which causes the generation of the alarm.

Abstract: A wire cut electrical discharge machine is provided. The wire cut electrical discharge machine includes a base. At least two wire feeding and receiving components are disposed over the base. A working area is between the wire feeding and receiving components. At least two flaky wire electrodes are disposed in the working area, wherein ends of the flaky wire electrodes are respectively set on the wire feeding and receiving components.

Abstract: A sealing apparatus comprises a circulating channel for a wire cutting machine, and the sealing apparatus further includes a channel at the position of a lower arm in the fluid tank for injecting a liquid, and a sealing O-ring installed at the sealing apparatus for preventing a leak of liquid, such that a circulating channel is formed around the periphery of the lower arm. The liquid is injected through an injecting inlet into the circulating channel such that the centrifugal force produced by the whirling flow can wash away the debrises attached on the lower arm, and discharge the debrises from a discharge opening to the outside.

Abstract: A wire machining method includes: a wire electrode set as cutting wires provided in parallel with a distance between the cutting wires of which a predetermined regional part faces a workpiece; a machining power source that generates a pulse-shaped machining voltage; and plural feeder units that are electrically connected to the plural cutting wires respectively of the wire electrode and supply the machining voltage between the cutting wires and the workpiece respectively. The feeder units are arranged such that a direction of a current passed to at least a part of the cutting wires becomes a direction different from a direction of a current passed to other cutting wires.

Abstract: A wire-discharge machining apparatus controls a short circuit between a wire electrode and a workpiece and wire-breakage, and makes it easy to improve productivity, by performing power supply control to mix an upper-side power supply state in which a high-frequency pulse voltage is applied from an upper-side power supplying unit, a lower-side power supply state in which the high-frequency pulse voltage is applied from a lower-side power supplying unit, and a both-sides power supply state in which the high-frequency pulse voltage is applied to the wire electrode from both power supplying units in synchronization with each other during a period of electric discharge machining.

Abstract: A wire collecting mechanism for cutting and collecting a metal wire used in a wire-cut electrical discharge machine includes a first guide roller and a second guide roller movable relative to the first guide roller for clamping the metal wire that passes between the first guide roller and the second guide roller. A wire cutter is moveable relative to the metal wire for cutting the metal wire that is clamped. A wire collecting box is provided with a mouth facing the metal wire and a suction force towards an inside of the wire collecting box. A press roller is movable relative to the metal wire for pressing and forcing a cutting piece of the metal wire into the mouth of the wire collecting box, such that the cutting piece of the metal wire can be sucked into the wire collecting box.

Abstract: A method of measuring a taper angle in a wire electric discharge machining apparatus comprises, the steps of: providing a measuring tool (2) having lower and upper edges (27, 23) being spaced by a given height (H); moving a vertical wire electrode (EV) from a reference position (R) in one direction by a first distance (X1) to the lower edge (27); moving the vertical wire electrode from the reference position in the one direction by a second distance (X2) to the upper edge (23); moving an inclined wire electrode (EI) from the reference position in the one direction by a third distance (X3) to the lower edge; moving the inclined wire electrode from the reference position in the one direction by a fourth distance (X4) to the upper edge; and calculating a taper angle (?) of the inclined wire electrode based on the following equation: ?=tan?1 ?/H ?=|(X3?X1)?(X4?X2)|.

Abstract: In a reference (n-th) machining pass, the wire travels along a machining route RTn and passes through a reentrant angular corner with wire position WMn, producing a workpiece edge Hn. In the following (n+1)-th machining pass, the wire travels along a machining route RTn+1, but the straight sections preceding and following the corner are replaced with a circular arc route so that the wire passes smoothly through a straight route, then a circular arc route, and then a straight route. The radius of curvature of the circular arc route is determined in the controller on the basis of the difference between the offset specified for the reference (n-th) machining pass and the offset specified for the (n+1)-th pass in which the circular arc route is inserted. Accordingly, the machining margin does not increase in the reentrant angular corner and the machining accuracy is thereby improved.

Abstract: An electrode wire for wire electric discharge machining includes a binary alloy of copper and zinc. The electrode wire is manufactured by hot-extruding an alloy including copper and zinc at a predetermined ratio and then cold-drawing and annealing the hot-extruded alloy, and ? phase crystals and ?? phase crystals uniformly exist.

Abstract: When a wire electrode is arranged along a traveling path by manual operation, a motor M1 for feeding the wire electrode to a workpiece is driven in response to a predetermined torque command from a control section with a switch SW1 on a side a. The wire electrode is connected, and a motor M2 for delivering the electrode from the wire is driven at a predetermined speed, whereby the electrode is run. Then, the switch SW1 is shifted to a side b and a switch SW2 to the side a, and the motor M1 is subjected to torque control such that a tension on the wire electrode detected by a tension detector is equal to a command tension. When a variation of the tension on the wire electrode is converged, the switches SW1 and SW2 are shifted to the side b, speed control of the motor M1 is performed so that detected tension is equal to the command tension, and electric discharge machining is started.

Abstract: Methods of recycling excess semiconductor material removed from an unshaped semiconductor boule are disclosed. Excess semiconductor material is cut from an semiconductor unshaped boule thereby generating a shaped semiconductor boule. The excess semiconductor material is removed in the form of large pieces that can easily be cleaned and retrieved for reuse.

Abstract: A multi-wire electron discharge machine includes a first wire electrode for creating an electrical discharge between the first electrode wire and a semiconductor ingot, a second wire electrode for creating an electrical discharge between the second electrode wire and the semiconductor ingot, and a wire guide for maintaining the first wire electrode in a spaced apart and generally parallel orientation with respect to the second wire electrode across a semiconductor ingot slicing area.

Abstract: A molten residual layer formed on a surface 26 of an electric-discharge machined portion 12 of a metal molding member 1 is eliminated by using a tool 70 made by a wire discharge grinding method. According to the wire discharge grinding method, a minute tool which high in processing accuracy and high in hardness can be obtained. Since the molten residual layer formed on a surface 26 of the portion 12 due to the electric-discharge machining is eliminated by using the tool, the molten residual layer can be eliminated uniformly with high accuracy.

Abstract: Enhanced electrode discharge machining properties of an electrode wire are achieved when the electrode wire comprises a coil, a covering layer formed on a periphery of the coil, and grains formed on the covering layer. The grains comprise a copper-zinc alloy including about 0.01 to 0.5 weight % of at least one additive element selected from the group consisting of aluminum, tin, magnesium, lanthanum, cerium, nickel, manganese, titanium, and zirconium.

Abstract: The invention concerns an electrode wire comprising an unalloyed copper core coated with a diffused zinc alloy coating layer, whereof the thickness is more than 10% of the wire diameter. The coating layer is optionally plated with a thin zinc, copper, nickel, silver or gold surface contact film. Such a wire achieves higher electrical discharge machining speed.

Abstract: A seal structure channels drainage of machining fluid from the periphery of an opening for a lower arm of a wire-cut electric discharge machine. The seal structure restricts flowage to the outside of machining fluid through the opening (slot) in a side of a machining tank and has a first seal and a second seal (a seal plate) affixed to the first seal so as to cover the opening. An unevenly shaped part including ridges and grooves extending in the long direction of the first seal is formed on the first seal, and passages are provided that communicate with the groove and the outside to channel the machining fluid drainage path. The first seal may be composed of a plurality of members. A suction device sucks up machining fluid draining from the passages.

Abstract: A discharge-generation control unit applies at least a preliminary-discharge voltage pulse and a main-discharge voltage pulse between a wire electrode and a work. A discharge-position determining unit determines a discharge position from results of measurement by a plurality of current measuring units. A machining-energy adjusting unit adjusts machining energy generated by the main-discharge voltage pulse based on a discharge position determined before applying the main-discharge voltage pulse, and reflects a result of the adjustment on the generation of an electric discharge by feeding the result to the discharge-generation control unit.

Abstract: The electrical discharge machining device comprises a first voltage/current source (U1) for discharge initiation connected to the tool electrode (F) and a workpiece electrode (P) forming the poles of a machining gap (G) and a second voltage/current source (U2) that can be disconnected by way of two switches (SW1, SW2). Capacitive elements (C1, C5) are mounted in series in the lines (10, 11) connecting the first source to the poles of the machining gap (G). In addition, these poles can be connected by a self-induction coil (Lm) mounted in series with an adjustable DC source (Sm). Thanks to these features, the energy of the eroding discharges can be significantly reduced in order to obtain a superfine surface finishing process of high quality, while at the same time precisely controlling the mean voltage across the terminals of the machining gap.

Abstract: A wire electric discharge machining apparatus can select a split guide formed from a pair of guide pieces, or an unsplittable dice guide, as an upper wire guide. An upper wire guide assembly includes a housing configured to selectively store the split guide or an adapter that the dice guide fitted into, and an actuator configured to move at least one of the pair of guide pieces. When the split guide is selected, a guide pipe configured to form a fluid jet can be moved downward through the upper wire guide assembly. When the dice guide is selected, an AWT jet nozzle configured to form a fluid jet can be attached to the adapter. Further, a jacket can be attached to the housing, the jacket having a fluid inlet configured to introduce fluid to be supplied to the AWT jet nozzle.

Abstract: Provided are a wire electric discharge machining method for poorly conductive materials, such as solar cell silicon, and a semiconductor wafer manufacturing method and a solar battery cell manufacturing method based on the wire electric discharge machining method. Electrical discharge machining of a high volume resistivity, hard and brittle materials, having a volume resistivity that is equal to or higher than 0.5 ?·cm and equal to or lower than 5 ?·cm is performed by applying a pulse voltage having a pulse width that is equal to or higher than 1 ?sec and equal to or lower than 4 ?sec and having a peak current at the time of machining a wire electrode that is equal to or higher than 10A and equal to or lower than 50A to a wire electrode and generating a discharge pulse between the wire electrode and a subject to be machined.

Abstract: A wire electrical discharge machine (WEDM) including a motion platform, a sink, a workbench, a connecting element, a jib, a first head and a second head is provided. The sink is disposed separately above the motion platform, and the workbench is disposed in the sink. The workbench is connected to the motion platform via the connecting element such that the motion platform drives the workbench moving along a first direction and a second direction. Besides, the jib is fixedly connected with the sink, and the first head is disposed inside the sink and connected with the jib. The second head is disposed above the first head. Thus, the jib does not cause relative motion to the sink in order to avoid leaking.

Abstract: A wire inserting method comprises a pipe inserting step of inserting one pipe (5) into all through-holes (11) under the state where the plurality of through-holes (11) are arranged on the same axis, a wire inserting step carried out after, or in parallel with, the pipe inserting step, for inserting the electrode wire (2) through the pipe (5), and a pipe removing step of pulling out only the pipe (5) from the through-holes (11) after the wire insertion step.

Abstract: Automated handling systems and methods for using the handling systems for handling a work piece in a machining process, for example, an electrical discharge machining (EDM) process, are provided. The handling systems include a robotic manipulator adapted to grasp a work piece and locate the work piece in a machining operation, such as, an EDM machining operation. The robotic manipulator includes tooling having gripping devices adapted to grasp and position the work piece so that the work piece can be transferred and positioned, for example, precisely positioned, whereby accurate machining of the work piece can be practiced with little or no custom tooling. Methods for handling a work piece are also disclosed.

Abstract: A wire retrieving device for a cutting machine includes a block connected with an air source and a blowing path is defined through the block. A suction path is defined in a side of the block and has an oblique port formed in a surface of the block through which the discarded wire is sucked into the suction path which further has an engaging port communicating with the blowing path. A pushing member removably pushes the metal wire toward the block by an electromagnetic valve when the metal wire needs to be cut by an electrode unit. A pair of driving rollers located a down stream of the electrode unit and pulls the metal wire toward the upper mold. The discarded wire is blowing out from the blowing path and is collected in a collection tank via a tube.

Abstract: A microshaft forming method and apparatus for forming a microshaft without requiring high level of stillness required by conventional methods. The microshaft forming apparatus comprises an elongated electrode (1) to be formed into a microshaft, a forming plate (3) for forming the electrode (1), electrode rotating means for rotating the electrode (1) around the length direction (1a) of the electrode (1), a discharge machining power supply (5) for applying a voltage between the electrode (1) and the forming plate (3) to cause discharge between the electrode (1) and the forming plate (3), and electrode moving means for traversing the electrode (1) rotated by the electrode rotating means across the forming plate (3) from the side edge surface (3a) of the forming plate (3).

Abstract: For specifying a cause of generation of a water level abnormality alarm in a wire-cut electric discharge machine, stopping supply of a machining liquid to a machining tank when the alarm is generated, draining the liquid; measuring an amount of change in the water level per unit time that is detected by the water level detecting unit; and displaying a question to an operator about the measured amount of change in water level and the state of a water level adjusting mechanism. The operator manually inputs an answer to the displayed question, and specifies, from the answer input by means of the inputting unit, a part which causes the generation of the alarm.

Abstract: A wire-receiving mechanism for holding electrical wire used to cut or burn through a metal work piece in wire electrical discharge machines (WEDMs) is disclosed. A passive wheel and an active wheel are disposed side by side with one another in a case body, the active wheel being capable of causing the passive wheel to rotate, wherein one side of the passive wheel has a driving unit defined thereon. The driving unit is disposed to penetrate through one side of the case body, and includes a driving member disposed to one side of the case body, an action member connected to the driving member and a sliding member connected to the action member for pushing the passive wheel, wherein a pretension spring is disposed at one side of the sliding member for controlling the gap between the passive wheel and the active wheel such that the processing wires can be stably held and conveyed.

Abstract: An electric discharge machining apparatus comprises a power supply (5) for applying a voltage to a work gap formed between a tool electrode (E) and the workpiece (W) and a motor (7) that moves the tool electrode relative to the workpiece. An electric discharges counter (45) counts a number of electric discharge occurrences within a specified period (Td1) and generating a first count. A gap controller (48) multiplies the first count by a gain to generate position command or speed command for motor drive. An inversion counter (42) counts a number of inversions of the gap voltage upwards or downwards within a second specified period (Td2) and generating a second count. An electric discharge discriminator (44) discriminates the occurrence of electric discharge when the second count reaches a set value.

Abstract: A wire electric discharge machine and a wire electrode cutting method capable of carrying out a wire electrode cutting process without need for an operator to input information on material or a diameter of a wire electrode. An electric current measuring device measures a value of an electrical current flowing through a wire electrode to which a voltage is applied. An electrical resistance of the wire electrode is detected based on the applied voltage and the measured value of the electrical current. A plurality of cutting conditions predetermined and stored for electrical resistances of different types of wire electrodes. A cutting condition for the wire electrode is determined based on the detected electrical resistance of the wire electrode and the stored plurality of cutting conditions, and the wire electrode is fusion-cut on the thus determined cutting condition.

Abstract: A wire electric discharge machining apparatus includes guide rollers, one electrode wire that is wrapped around each of the guide rollers to form cut wire portions spaced from one another between a pair of the guide rollers. A processing power supply feeds electric power to the individual cut wire portions through a power feed element, and a high frequency insulator has wound coils which are formed of the electrode wire and located between adjacent ones of the cut wire portions 2a, respectively, and cores which close magnetic circuits of the individual coils, respectively, and 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 by the individual coils at high frequencies. As a result, it becomes possible to impress voltages on the individual cut wire portions independently, so discharges can be generated in a simultaneous and parallel manner.

Abstract: A wire electric discharge machine capable of maintaining machining-fluid temperature in a machining tank uniformly, even when the state of machining changes, for example between rough machining and finish machining. A first temperature sensor for detecting the machining-fluid temperature in a clean-fluid tank is provided to the clean-fluid tank or a machining-fluid cooling device. A second temperature sensor for detecting the machining-fluid temperature in the machining tank is provided. On the basis of machining conditions, etc., a controller of the wire electric discharge machine selects the second temperature sensor in machining producing much heat such as rough machining, and selects the first temperature sensor in machining producing little heat such as finish machining. The machining-fluid cooling device performs cooling control on the machining fluid in the clean-fluid tank based on the temperature detected by the selected temperature sensor.

Abstract: A wire electric discharge machining method of machining the workpiece with different thickness into a required shape with first cut and second cut. The method includes the steps of (a) detecting a position of the wire electrode relative to the workpiece, (b) detecting change in thickness of the workpiece during first cut, (c) storing the position of wire electrode as a thickness change position (Q1) when change in thickness of the workpiece from a first thickness (t1) to a second thickness (t2) is detected, (d) forming a zone (?) around the thickness change position, (e) comparing the position of wire electrode to the zone during second cut, and (f) changing at least one machining condition during times when it is determined that the wire electrode is positioned in the zone.

Abstract: A measuring member having a conical section with a known vertex angle is inserted into a guide hole through a trumpet-shaped inner surface (wire guiding surface) formed by rotating a convex about the axis of the guide hole. Then, the surface of the conical section of the measuring member stops at the point of tangential contact with the inner surface. The point at which the wire electrode is supported, measured from the reference wire supporting point, can be determined from the height of a specific point on the measuring member in the stopped state and the distance from this specific point to the vertex of the conical section of the measuring member.

Abstract: An electrical discharge machining apparatus having a wire electrode and a guide system for machining reverse-taper bores in a workpiece, particularly cone-shaped bores. A guide body near the workpiece stabilizes a first portion of an electrode and a second portion of the electrode extends from the guide body terminating in a working tip. As the guide body is wobbled about the longitudinal axis of a desired workpiece bore, the electrode is advanced and the working tip of the electrode erodes progressively larger closed curves in the workpiece, resulting in a reverse taper bore in the workpiece.

Abstract: A debris removal system for a wire electronic discharge machining (WEDM) apparatus has a fluid source. A pressurization device is coupled to the fluid source to pressurize a fluid from the fluid source. At least one fluid delivery nozzle is coupled to the pressurize device. The at least one fluid delivery nozzle is positioned behind a wire electrode of the WEDM apparatus and approximately perpendicular to the wire electrode to inject the pressurized fluid directly into an active cutting area between the wire and work piece.

Abstract: In a reference (n-th) machining pass, the wire travels along a machining route RTn and passes through a reentrant angular corner with wire position WMn, producing a workpiece edge Hn. In the following (n+1)-th machining pass, the wire travels along a machining route RTn+1, but the straight sections preceding and following the corner are replaced with a circular arc route so that the wire passes smoothly through a straight route, then a circular arc route, and then a straight route. The radius of curvature of the circular arc route is determined in the controller on the basis of the difference between the offset specified for the reference (n-th) machining pass and the offset specified for the (n+1)-th pass in which the circular arc route is inserted. Accordingly, the machining margin does not increase in the reentrant angular corner and the machining accuracy is thereby improved.

Abstract: An electrode wire with multi-coated layers for electrical discharge machining (EDM) is capable of fast and precisely machining a work piece for a desired shape without changing the electrode wire, and a method of manufacturing the electrode wire is obtained by performing the steps of manufacturing a core wire, coating the core wire with zinc, drying the coated core wire, diffusion-heat treating of the coated core wire, drawing a product from the coated core wire, and stabilization treating of the coated core wire in order.