Patent application number | Description | Published |
20100012626 | WIRE ELECTRICAL DISCHARGE MACHINING APPARATUS - 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. | 01-21-2010 |
20100084378 | WIRE ELECTRICAL DISCHARGE MACHINING APPARATUS - 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. | 04-08-2010 |
20100224596 | WIRE ELECTRICAL DISCHARGE MACHINING APPARATUS - 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. | 09-09-2010 |
20110100959 | WIRE ELECTRIC DISCHARGE MACHINE AND WIRE ELECTRIC DISCHARGE MACHINING METHOD - Based on a discharging gap value and machining allowance value stored in a corner-control-information storing means | 05-05-2011 |
Patent application number | Description | Published |
20090014420 | WIRE ELECTRIC DISCHARGE MACHINING APPARATUS - 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 | 01-15-2009 |
20090134126 | Electric-discharge machining apparatus and electric-discharge machining method - In an electric-discharge machining apparatus for controlling a machining axis so that an average voltage Vg during a predetermined sampling time Ts agrees with a servo standard voltage SV, the apparatus includes: an electric power supplier | 05-28-2009 |
20090212026 | WIRE ELECTRIC DISCHARGE MACHINING METHOD, SEMICONDUCTOR WAFER MANUFACTURING METHOD, AND SOLAR BATTERY CELL MANUFACTURING METHOD - 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 Ω·cm and equal to or lower than 5 Ω·cm is performed by applying a pulse voltage having a pulse width that is equal to or higher than 1 μsec and equal to or lower than 4 μsec 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. | 08-27-2009 |
20090314747 | WIRE ELECTRIC DISCHARGE MACHINE - 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; a first power feed contact and a second power feed contact that respectively feed power to the wire electrode; a first machining-current loop that lets a first machining current to flow from the first power feed contact toward the workpiece; a second machining-current loop that lets a second machining current to 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. | 12-24-2009 |
20100133237 | Wire-Discharge Machining Apparatus - 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. | 06-03-2010 |
20110092053 | WIRE DISCHARGE-MACHINING APPARATUS AND WIRE DISCHARGE-MACHINING METHOD, SEMICONDUCTOR WAFER MANUFACTURING APPARATUS AND SEMICONDUCTOR WAFER MANUFACTURING METHOD, AND SOLAR-CELL WAFER MANUFACTURING APPARATUS AND SOLAR-CELL WAFER MANUFACTURING METHOD - 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. | 04-21-2011 |
20110114604 | ELECTRIC DISCHARGE MACHINING APPARATUS, ELECTRIC DISCHARGE MACHINING METHOD, AND SEMICONDUCTOR SUBSTRATE MANUFACTURING METHOD - An electric discharge machining apparatus includes: electrodes the total quantity of which is equal to N; an alternating-current power source; and capacitors the total quantity of which is equal to N. The alternating-current power source applies an alternating voltage commonly to the electrodes. One end of each of the capacitors is connected to a corresponding one of the electrodes, whereas the other ends of the capacitors are commonly connected to the alternating-current power source. | 05-19-2011 |
20120103943 | WIRE ELECTRIC DISCHARGE MACHINING APPARATUS - A wire electric discharge machining apparatus that performs an electric discharge machining by applying a pulse voltage between a wire electrode ( | 05-03-2012 |
20120152906 | WIRE ELECTRIC DISCHARGE MACHINING APPARATUS - 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. | 06-21-2012 |
20120217224 | WIRE ELECTRIC DISCHARGE MACHINING APPARATUS, WIRE ELECTRIC DISCHARGE MACHINING METHOD, THIN BOARD MANUFACTURING METHOD, AND SEMICONDUCTOR WAFER MANUFACTURING METHOD - 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. | 08-30-2012 |
20120234797 | CORROSION PREVENTING APPARATUS, CORROSION PREVENTING METHOD, AND WIRE ELECTRIC DISCHARGE MACHINING APPARATUS - 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. | 09-20-2012 |
20120255934 | LIQUID-QUALITY ADJUSTING APPARATUS, LIQUID-QUALITY ADJUSTING METHOD, AND WIRE ELECTRIC DISCHARGE MACHINING APPARATUS - 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. | 10-11-2012 |
20120312787 | ELECTRICAL DISCHARGE MACHINING APPARATUS AND ELECTRICAL DISCHARGE MACHINING METHOD - 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. | 12-13-2012 |
20130043217 | WORKPIECE RETAINER, WIRE ELECTRIC DISCHARGE MACHINING DEVICE, THIN-PLATE MANUFACTURING METHOD, AND SEMICONDUCTOR-WAFER MANUFACTURING METHOD - 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. | 02-21-2013 |
20130140277 | WIRE ELECTRIC DISCHARGE MACHINING APPARATUS, WIRE ELECTRIC DISCHARGE MACHINING METHOD, THIN PLATE MANUFACTURING METHOD, AND SEMICONDUCTOR WAFER MANUFACTURING METHOD - A wire electric discharge machining apparatus includes a wire electrode, a guide roller that arranges wire electrodes in parallel by winding the wire electrode therearound, a plurality of slidable contact conductors that are in slidable contact with the wire electrodes arranged in parallel, respectively, and a power feeding jig that holds the slidable contact conductors individually and feeds power individually to the wire electrodes arranged in parallel via each of the slidable contact conductors, in which the power feeding jig includes a plurality of reference surfaces that determine a fixing interval between the slidable contact conductors. | 06-06-2013 |
20130240487 | WIRE-CUT ELECTRICAL DISCHARGE MACHINING APPARATUS AND SEMICONDUCTOR WAFER MANUFACTURING METHOD - 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. | 09-19-2013 |