Patent application number | Description | Published |
20090101627 | ELECTRIC DISCHARGE MACHINE HAVING WIRE ELECTRODE CUTTING FUNCTION, AND WIRE ELECTRODE CUTTING METHOD - 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. | 04-23-2009 |
20090120911 | WIRE BREAK DETECTING DEVICE FOR WIRE ELECTRIC DISCHARGE MACHINE - In electric discharge machining for intermittently applying voltage pulses between a wire electrode and a workpiece with quiescent periods interposed, test voltage for checking conduction between upper and lower power feeding elements is applied during quiescent periods. When there is no conduction, it is determined that the wire electrode is broken between the upper and lower power feeding elements. | 05-14-2009 |
20120001577 | TORQUE MOTOR DRIVING DEVICE FOR WIRE CUT ELECTRICAL DISCHARGE MACHINES - 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. | 01-05-2012 |
20120223055 | WIRE-CUT ELECTRIC DISCHARGE MACHINE HAVING FUNCTION OF DETECTING UPPER SURFACE OF WORKPIECE - 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. | 09-06-2012 |
20130015162 | POWER SUPPLY DEVICE FOR WIRE ELECTRIC DISCHARGE MACHINE CAPABLE OF SUPPRESSING WIRE ELECTRODE CONSUMPTIONAANM MATSUNAGA; TomoakiAACI Minamitsuru-gunAACO JPAAGP MATSUNAGA; Tomoaki Minamitsuru-gun JPAANM KAWAHARA; AkiyoshiAACI Minamitsuru-gunAACO JPAAGP KAWAHARA; Akiyoshi Minamitsuru-gun JP - A power supply device for a wire electric discharge machine is provided with a main DC power source and an auxiliary DC power source with variable voltage. While first pulses are being output, a voltage from the main DC power source is applied to a machining gap between a wire electrode and a workpiece. While second pulses are being output with the output of the first pulses stopped, inductive energy stored by an inductance in a circuit is passed through the gap, and a voltage corresponding to a peak current value provided by the main DC power source is applied to the gap by the auxiliary DC power source. When the output of the second pulses is stopped, the inductive energy is returned to the main DC power source. | 01-17-2013 |
20130161293 | WIRE ELECTRIC DISCHARGE MACHINE DISSOLVING INTERT GAS IN MACHINING FLUID AND WIRE ELECTRIC DISCHARGE MACHINING METHOD USING THE SAME - A wire electric discharge machine machines a workpiece immersed in an electrically conductive water-based machining fluid stored in a machining vessel. An inert gas dissolver is provided in the wire electric discharge machine to pressurize the machining fluid, dissolve an inert gas into the pressurized machining fluid, and depressurize the machining fluid, such that wire discharge machining is carried out in the machining fluid containing the inert gas dissolved therein. | 06-27-2013 |
20140014624 | WIRE ELECTRIC DISCHARGE MACHINE WITH MACHINING POWER SOURCE SWITCHABLE FOR WIRE CUTTING - 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. | 01-16-2014 |