Class / Patent application number | Description | Number of patent applications / Date published |
219690130 | Circuits | 49 |
20080203068 | Power Supply-Control Device for Electrical Discharge Machining Apparatus - A power-supply control device includes a high-frequency component detecting unit, a machining voltage level detecting device, and a pulse control device. The high-frequency component detecting unit detects a high-frequency component of discharge voltage at a machining gap. The machining voltage level detecting device detects a discharge voltage level at the machining gap. The high-frequency component is compared with a reference high-frequency component to obtain a first comparison result. The discharge voltage level is compared with a reference voltage level to obtain a second comparison result. The pulse control device controls pulse off time based on the first comparison result, and cuts off a discharge pulse based on the second comparison result. | 08-28-2008 |
20080230521 | Power Supply Apparatus for Electric Discharge Machine and Power Supply Control Method - A power supply apparatus for an electric discharge machine configured to perform melt-removal on a workpiece by supplying pulse-like power to a machining gap between an electrode ( | 09-25-2008 |
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 |
20090230092 | POWER SUPPLY CIRCUIT FOR WIRE ELECTRIC DISCHARGE MACHINING APPARATUS - A power supply circuit for a wire electric discharge machining apparatus includes an auxiliary power supply ( | 09-17-2009 |
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 |
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 |
20100096364 | METHOD AND APPARATUS FOR CONTROLLING AN ELECTRIC DISCHARGE MACHINING PROCESS - A method for controlling an electric discharge machining process, wherein a tool electrode is moved relatively to a workpiece with a working gap distance, wherein the process includes a current and at least one previous erosion cycle, the current and the previous erosion cycle each being divided into predetermined time intervals each including at least one discharge pulse, wherein similar working gap conditions are present within a time interval of the previous erosion cycle and of the current erosion cycle, and wherein subsequent erosion cycles are separated by a process pause cycle. | 04-22-2010 |
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 |
20100140226 | TANDEM MICRO ELECTRO-DISCHARGE MACHINING APPARATUS - A Tandem-type micro electro-discharge machining (EDM) apparatus comprises a EDM machining stage, a gradation twin-wire EDM device, an electrode tool, a workpiece, and a resistor-capacitor (RC) EDM circuit. The gradation twin-wire EDM device further comprises a wire supply reel unit, a wire take-up reel unit, a stepped insulating roller, a twin-wire conductor unit, and a discharge circuit unit. With the design of the gradation twin-wire EDM device, only one single EDM procedure is needed to simultaneously perform rough EDM and finish EDM processes together on the electrode tool to form a required micro electrode tool, which can be immediately used to perform micro-hole EDM or scanning EDM on the workpiece. Therefore, the Tandem-micro EDM apparatus of the present invention can be functioned automatically to achieve mass production of micro holes EDM and reduce machining time and improve machining efficiency and product's quality. | 06-10-2010 |
20100147805 | Power-Supply Control Device for Electrical Discharge Machining Apparatus - A power-supply control device includes a high-frequency component detecting unit, a machining voltage level detecting device, a no-load time detecting device, and a pulse control device. The high-frequency component detecting unit detects a high-frequency component of discharge voltage at a machining gap. The machining voltage level detecting device detects a discharge voltage level at the machining gap. The no-load time detecting device detects delay time of discharge of the discharge voltage at the machining gap. The high-frequency component is compared with a reference value to obtain a first comparison result. The discharge voltage level is compared with a reference level to obtain a second comparison result. The pulse control device controls pulse off time based on the first comparison result and the detected delay time, and cuts off a discharge pulse based on the second comparison result. | 06-17-2010 |
20100187204 | WIRE ELECTRIC DISCHARGE MACHINING METHOD AND APPARATUS - A method for controlling a wire electric discharge machine comprising the steps of:
| 07-29-2010 |
20100213176 | SINKER ELECTRIC DISCHARGE MACHINING METHOD, AND SINKER ELECTRIC DISCHARGE MACHINING APPARATUS - A sinker electric discharge machining apparatus for machining a workpiece by generating electric discharge in a work gap by applying a voltage having an OFF time, may include a discriminator for generating a first signal representing an abnormal state of the work gap, and a second signal representing a normal state of the work gap; and a pulse controller, in which a first extension factor and a second extension factor that is smaller than the first extension factor are set and a first reduction factor and a second reduction factor that is smaller than the first reduction factor are set. The pulse controller extends the OFF time using either the first or the second extension factor if the first signal is received. The pulse controller reduces the OFF time using either the first or the second reduction factor if the second signal is received. | 08-26-2010 |
20100219164 | FLUID-QUALITY CONTROL METHOD, FLUID-QUALITY CONTROL APPARATUS, AND ELECTRIC-DISCHARGE MACHINING APPARATUS EMPLOYING THE SAME - Target fluid is made into electrolyte solution when measured fluid-quality value is lower than a first condition value, by substituting an impurity anion contained in the target fluid with a predetermined anion and substituting an impurity cation contained in the target fluid with a predetermined cation, and purified when the fluid-quality value is higher than a second condition value. The above procedures are repeated, so that the fluid-quality value of the target fluid falls within a predetermined range, to make the target fluid into electrolyte solution with a correlation between pH and conductivity. | 09-02-2010 |
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 |
20100308017 | ELECTRIC DISCHARGE MACHINING DEVICE - An electric discharge machining device that performs processing by applying a voltage pulse to space between the processing electrode and the workpiece and suitably switching the polarity of the voltage pulse attains both desired processing accuracy and desired controllability. The electric discharge machining device is provided with the first to fourth switching elements. The controlling unit that controls these switching elements, when setting a period time in which the first switching element is turned on, a period of time in which the fourth switching element is in an on-state in the same period, and, when setting a period time in which the second switching element is turned on, a period of time in which the third switching element is in an on-state in the same period so that a desired voltage pulse is applied to the space between the processing electrode and the workpiece. | 12-09-2010 |
20100320172 | DRIVE DEVICE FOR EROSION TOOLS - 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. | 12-23-2010 |
20100320173 | POWER SOURCE CONTROLLER OF ELECTRICAL DISCHARGE MACHINE - A discharge pulse control device cuts off a pulse width of the a discharge pulse being produced in a machining gap when a comparison result of a voltage level comparator indicates abnormal electrical discharge. Upon detection of abnormal electrical discharge based on comparison results of a high-frequency component comparator and the voltage level comparator, a quiescent period control unit constructed from a discharge pulse diagnosis device, a first pulse counter, a second pulse counter, and a quiescent pulse control device performs change setting of the quiescent period at the time of occurrence of abnormal electrical discharge and sends that information to the discharge pulse control device. Subsequently, the discharge pulse control device performs change control of the quiescent period at the time of occurrence of abnormal electrical discharge so that the discharge pulse and the quiescent time are optimally controlled. | 12-23-2010 |
20110000889 | ELECTRIC DISCHARGE MACHINING APPARATUS AND ELECTRIC DISCARGE MACHINING METHOD - In a waveform of switching signals, which is output from a full-bridge circuit formed of four switching elements, includes a normal polarity pulse group and a reversed polarity pulse group for controlling an output timing of voltage pulses. A duty cycle of the normal polarity pulse group containing a plurality of normal polarity pulses, which apply a positive power-supply polarity to a workpiece and apply a negative power-supply polarity to a machining-purpose electrode, is configured so as to be different from a duty cycle of the reversed polarity pulse group containing a plurality of reversed polarity pulses, which apply a negative power-supply polarity to the workpiece and apply a positive power-supply polarity to the machining-purpose electrode. | 01-06-2011 |
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 |
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 |
20110163071 | POWER SUPPLY DEVICE FOR ELECTRICAL DISCHARGE MACHINE - A switching element operates to be turned on or off at a frequency in the order of megahertz. A reactor supplies a resonance current generated by resonance of the reactor with a floating capacitance between electrodes to between the electrodes. The resonance current does not flow in a direct-current power supply. By turning a capacitor and a floating inductance into a serial resonant state, the reactor ideally supplies the resonance current to between the electrodes without influence of the floating inductance. A high-frequency voltage asymmetric in positive and negative polarities is applied to between the electrodes and a current pulse can be made into a short pulse. Therefore, finish machining with high surface roughness can be performed. | 07-07-2011 |
20110186551 | ELECTRIC DISCHARGE MACHINE AND METHOD OF PRODUCING NOZZLE BODY USING THE SAME - An electric discharge machine to process a work piece includes a plurality of electrodes, and a plurality of discharge power supply units. The plurality of electrodes generate a plurality of discharges with the work piece, respectively. The plurality of discharge power supply units apply voltages for the plurality of electrodes, respectively and independently. | 08-04-2011 |
20110220614 | PORTABLE EDM SYSTEM FOR MAKING CALIBRATION STANDARDS - A portable EDM device and system thereof for producing calibration reflectors on a pipe includes a base mountable on the pipe, a motor mounted on the base, a cutting tool operably connected to the motor, an electrode operably connected to the cutting tool, a power source mounted on the base and operably connected to the electrode and operably connectable to the pipe, and a source of dielectric fluid mounted on the base. The power source is configured to electrically discharge a voltage from the electrode to the pipe to remove material from the pipe. The source of dielectric fluid is in fluid communication with the pipe to remove the material removed from the pipe. | 09-15-2011 |
20110220615 | POWER SUPPLY DEVICE FOR SINKER ELECTRIC DISCHARGE MACHINING - A power supply device comprises a DC power supply ( | 09-15-2011 |
20110226742 | WIRE ELECTRIC DISCHARGE MACHINING APPARATUS - 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. | 09-22-2011 |
20120024821 | WIRE ELECTRIC DISCHARGE MACHINING APPARATUS - A wire electric discharge machining apparatus for machining a workpiece ( | 02-02-2012 |
20120043303 | WORK MEASURING METHOD, ELECTRIC DISCHARGE MACHINING METHOD, AND ELECTRIC DISCHARGE MACHINING APPARATUS - The present invention includes steps of, determining a search starting position; setting a center position, and a first position and a second position with a distance provided therebetween; obtaining a measurement point group including measurement points of the center position, the first position, and the second position; and determining a measurement point closest to the tip portion in the measurement point group based on positions of the measurement points in a second direction and selecting a position of the measurement point in a first direction as a selected position. When the measurement point group is obtained initially after the determination of the search starting position, the search starting position is set as the center position; and when the measurement point group is obtained after the selection of the selected position, the selected position is set as the center position. The distance is narrowed for every selection of the selected position. | 02-23-2012 |
20120152907 | SELF-ADJUSTING POWER DEVICE FOR HIGH EFFICIENCY ELECTRICAL DISCHARGE MACHINING AND METHOD THEREOF - A self-adjusting power device for high efficiency electrical discharge machining and method thereof is disclosed. A high-voltage arc unit and a low-voltage discharge unit provide a high voltage arc pulse and a low voltage discharge pulse to an electrode respectively. The electrode machines a workpiece and feeds back a gap voltage to a discharge pulse generation unit. The discharge pulse generation unit determines whether the gap voltage is lower than a predetermined voltage or not. If yes, a discharge channel between the electrode and the workpiece is conducted, and the discharge pulse generation unit shuts down the high-voltage arc unit and the low-voltage discharge unit is still operating at ON time and shuts down at OFF time. If no, looping the determination of the discharge pulse generation unit. Therefore, discharge machining energy is accurately controlled and high efficient power saving is achieved. | 06-21-2012 |
20120228270 | ELECTRIC DISCHARGE MACHINE - 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. | 09-13-2012 |
20130001203 | ELECTRIC DISCHARGE MACHINING HOLE DRILLING - An apparatus and method for machining apertures into a conductive workpiece is disclosed. The apparatus has a tank capable of holding a dielectric fluid, and a fixture for holding the workpiece in the tank. An electric discharge machine with an electrode, a power supply connected to the electrode that produces machining pulses for electric discharge machining through the workpiece, and a controller for regulating the power supply and electrode position is also part of the apparatus. Finally, the apparatus has a pressure transducer connected to the fixture, and a process controller in communication with the electric discharge machine controller and pressure transducer. | 01-03-2013 |
20130062318 | WIRE DISCHARGE MACHINE - A wire discharge machine includes a wire electrode arranged with a gap from a workpiece, and a constant-voltage power supply that applies a high-frequency voltage between the workpiece and the wire electrode, and generates discharge between the workpiece and the wire electrode by applying the high-frequency voltage to machine the workpiece. The wire discharge machine further includes a current measurement unit that measures a current value of a current flowing from the constant-voltage power supply, a determination unit that determines a state between electrodes, which is a state between the workpiece and the wire electrode, based on a combination of a result of a threshold determination of the measured current value and a result of a threshold determination of a change value in the current value, and a control unit that controls a gap between the workpiece and the wire electrode based on the determined state between electrodes. | 03-14-2013 |
20130140276 | CONTROLLER OF ELECTRICAL DISCHARGE MACHINE - A controller of an electrical discharge machine comprises: a control unit that controls a machining condition set by the electrical discharge machine; an acquisition unit that acquires a parameter indicating an electrical discharge state between poles in a state where the machining condition is controlled by the control unit so that a normal electrical discharge occurs between the poles; an arithmetic unit that obtains a probability density distribution of the acquired parameter; a decision unit that decides a threshold that specifies a boundary between a normal electrical discharge and an abnormal electrical discharge between the poles based on the obtained probability density distribution; and a discrimination unit that discriminates whether the electrical discharge state between the poles is normal or abnormal by using the decided threshold, and wherein the control unit controls the machining condition based on a discrimination result of the discrimination unit. | 06-06-2013 |
20130168362 | ELECTRIC DISCHARGE MACHINING METHOD AND APPARATUS - A method of controlling an electric discharge machining apparatus having at least a tool electrode and a workpiece comprising positioning the tool electrode relative to the workpiece; generating at least one first type discharge impulse and at least one second type discharge impulse, wherein the at least one first type discharge impulse has a longer impulse duration than the impulse duration of the at least one second type discharge impulse, wherein the first type discharge impulse causes formation of a protective film against wear on the tool electrode and the second type discharge impulse causes erosion at least on the tool electrode; and applying the first and second type discharge impulses to a gap between the tool electrode and workpiece for material removal from the workpiece, wherein a ratio between the first and second type discharge impulses applied to the tool electrode causes predefined wear of the tool electrode. | 07-04-2013 |
20130206732 | ELECTRIC DISCHARGE MACHINING DEVICE - An electric discharge machining unit that performs electric discharge machining by clamping a target object with a clamper of a clamping device, the electric discharge machining unit including a timer that measures a lapse of a time, which has been set by a user as a preparation time for supporting the target object after an operation of a clamping/unclamping button for clamping or unclamping is detected, and a clamper control unit that causes the clamping device to perform an operation corresponding to the detected operation at a time-out of the timer. | 08-15-2013 |
20130292360 | POWER SUPPLY DEVICE FOR ELECTRIC DISCHARGE MACHINING APPARATUS AND ELECTRIC DISCHARGE MACHINING METHOD - The present invention is equipped with a series circuit that includes a DC power supply, switching elements and a diode for supplying DC or AC current pulses to a machining gap between a machining electrode and a workpiece, diodes that regulate a direction of the current flow to one direction, and a control unit that controls the switching elements. When the control unit generates a current pulse having a triangular waveform by an inductance that is present in the series circuit, the control unit controls the switching elements in order that a current-pulse time ratio that is a ratio between the non-current time and the current continuation time in the current pulse is equal to or lower than ⅕. | 11-07-2013 |
20140027409 | ELECTRIC-DISCHARGE MACHINING DEVICE - An electric-discharge machining device including an electric-discharge-state determination unit that determines whether an electric discharging state between a machining electrode and a workpiece is either a state of normal electric discharge or of abnormal electric discharge, and a machining-condition switching unit that changes at least one machining condition, further includes a storage unit that stores therein an electric-discharge-state determination indicator, a standard-deviation calculation unit, and a boundary calculation unit that calculates a boundary to be applied to a determination in the electric-discharge-state determination unit based on the electric-discharge-state determination indicator, wherein the machining-condition switching unit changes the machining condition according to a comparison result between the standard deviation calculated by the standard-deviation calculation unit and a standard deviation reference set as a reference of the standard deviation. | 01-30-2014 |
20140083980 | APPARATUS AND METHOD FOR ELECTRICAL DISCHARGE MACHINING MODULATION CONTROL - An apparatus for electrical discharge machining modulation control includes an EDM module, an open-circuit voltage modulation module, a reference-voltage modulation and judgment module, a database, and a control unit. The control unit selects a reference voltage, and an open-circuit voltage corresponding to characteristics of a workpiece from the database, and generates and transmits a second control signal to the open-circuit voltage modulation module for modulating the open-circuit voltage, and a third control signal to the reference-voltage modulation and judgment module for modulating the reference voltage utilised to determine if the ignition happened. The open-circuit voltage modulation module receives a first control signal periodically transmitted from the control unit for providing the open-circuit voltage to the EDM module. The reference-voltage modulation and judgment module performs an arc voltage measurement procedure, then the control unit determines the open-circuit voltage and the reference voltage. | 03-27-2014 |
20140116990 | ELECTRIC DISCHARGE MACHINING APPARATUS - An electric discharge machining apparatus of the present invention includes a power supply, an electrode gap configured so as to be formed by an electrode and a workpiece, and an earth floating-capacitance current-suppressing coil configured to be inserted between the power supply and the electrode gap. Accordingly, the impedance in the charging path from the power supply to an interelectrode capacitance (an interelectrode parallel capacitor and an interelectrode parallel floating capacitance) can be decreased, and the impedance in the charging path to an earth floating capacitance can be increased, thereby enabling the electric current from the earth floating capacitance during discharge machining to be suppressed. | 05-01-2014 |
20140131318 | ELECTRIC DISCHARGE MACHINING DIE SINKING DEVICE AND RELATED METHOD OF OPERATION - Systems and methods for controlled and precise EDM manufacturing of a component are disclosed. In one embodiment, a system includes: a tank for holding a fluid; a first electrode array in the tank, the first electrode array including a plurality of electrodes configured to shape a workpiece; a workpiece fixture for positioning the workpiece at least partially immersed in the fluid and proximate the first electrode array; a pulse generator for creating an electric discharge between the workpiece and the first electrode array to remove material from the workpiece; a gap sensing circuit communicatively connected to the workpiece and the first electrode array, the gap sensing circuit configured to monitor the electric discharge between the workpiece and the first electrode array; and a computing device communicatively connected to the gap sensing circuit and the workpiece fixture, the computing device manipulating a position of the workpiece in the tank relative the first electrode array based upon data obtained from the gap sensing circuit. | 05-15-2014 |
20140190941 | POWER SUPPLY DEVICE FOR ELECTRIC DISCHARGE MACHINING - In a power supply device for electric discharge machining, the polarity of the voltage to be applied is determined on the basis of a result of determination whether the machining gap is in open state or not, an average value of voltages applied across the machining gap voltage during machining, and the number of successive open states with the same polarity. This eliminates the need to significantly vary the voltages to be applied from positive to negative and from negative to positive, thereby reducing the output energy required by the machining power supply. | 07-10-2014 |
20140319102 | POWER SUPPLY DEVICE FOR ELECTRICAL DISCHARGE MACHINE - The present invention includes a series circuit that includes a DC power supply and a switching element for supplying a DC or AC current pulse to a machining gap between a machining electrode and a workpiece; and a control unit that controls the switching element, wherein when generating a current pulse having a triangular shape by an inductance present on the series circuit, the control unit controls on-time and off-time of the switching element such that a peak value of an arbitrary current pulse in a pulse train including a plurality of current pulses changes. | 10-30-2014 |
20140339199 | WIRE ELECTRIC DISCHARGE PROCESSING MACHINE WITH RUST PREVENTING FUNCTION - An electric discharge processing machine applies a voltage to a processing subject and a corrosion preventing electrode so as to prevent the corrosion of the processing subject. A reference current value which is proportional to the surface area of the processing subject is set so that a current density is maintained constantly, and a voltage of a corrosion preventing power supply is controlled so that a corrosion preventing current falls within a predetermined range. | 11-20-2014 |
20150060412 | ELECTRIC DISCHARGE MACHINE - The invention relates to a pulse generator module ( | 03-05-2015 |
20150069022 | NUMERICAL CONTROL APPARATUS FOR CONTROLLING WIRE ELECTRIC DISCHARGE MACHINE WHICH PERFORMS TAPER MACHINING - When a Z axis is moved while interrupting or continuing taper machining, a wire electric discharge machining control apparatus controls position of a UV axis by re-creating a taper deviation vector, based on a distance between upper and lower guides, such that a wire tilt angle does not change. | 03-12-2015 |
20150114936 | ELECTRIC DISCHARGE MACHINE - An electric discharge machine has a hand operation panel, which is provided with a manual pulse generator with a rotating part. The manual pulse generator generates a pulse signal corresponding to a rotation angle position of the rotating part. Further, the manual pulse generator outputs a move command for changing (i.e., increasing or decreasing) a relative distance between a tool electrode and a workpiece and commands for changing set values of machining conditions, based on the pulse signal from the manual pulse generator. | 04-30-2015 |
20150314383 | MACHINING POWER SUPPLY DEVICE FOR ELECTRIC DISCHARGE MACHINE - A machining power supply device for an electric discharge machine performs control to turn on a first semiconductor switching element, which is arranged in series between a DC power supply and a capacitor connected in parallel with a machining gap between an electrode and a workpiece, to charge the capacitor, and turn on a second semiconductor switching element, which is arranged in parallel with the capacitor and connected to a rectifier element, within a period in which the first semiconductor switching element is off. | 11-05-2015 |
20150343544 | PLURAL RESISTANCE-CAPACITANCE (PRC) ELECTRICAL DISCHARGE MACHINING SYSTEM - The present invention provides a plural resistance-capacitance (PRC) electrical discharge machining system comprising a control module, a digital electronic module, a driving module, and a discharge module. The control module allows the user to input a command and output a control signal accordingly. The digital electronic module processes the control signal and outputs a sequence signal to the driving circuit. The driving module amplifies the sequence signal and then outputs a driving signal to the discharge module. The discharge module then controls and drives a plurality of transistors to open circuits and break circuits according to the driving signal for controlling the charging and discharging of a plurality of capacitors of the discharge module in the electrical discharge machining. The present invention can increase the amount of discharge in a machining process, and improves the efficiency thereof. | 12-03-2015 |
20160031025 | WIRE ELECTRIC DISCHARGE MACHINE HAVING ERRONEOUS MACHINING PREVENTING FUNCTION - A wire electric discharge machine performs electric discharge machining on a workpiece by relatively moving a workpiece placed on a workpiece table and a wire electrode supported by upper and lower wire guides according to a machining program. The wire electric discharge machine comprises an interference determination unit configured to determine whether or not the top or bottom surface of the workpiece table interferes with the wire electrode at the height of the surface during the execution of the machining program. | 02-04-2016 |