ELECTRIC DISCHARGE MACHINING APPARATUS

An electric discharge machining apparatus includes a power supply, an electrode gap formed from an electrode and a workpiece, a current limiting resistor connected between the power supply and the electrode gap, switching elements that turns on and off application of a voltage from the power supply...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	KIM IEYOUNG, NAKAGAWA TAKAYUKI, TAKADA TOMOAKI, HASHIMOTO TAKASHI, SASAKI YUTO
Format:	Patent
Sprache:	eng
Schlagworte:	MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL TRANSPORTING WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OFELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKESTHE PLACE OF A TOOL
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Beschreibung
Zusammenfassung:	An electric discharge machining apparatus includes a power supply, an electrode gap formed from an electrode and a workpiece, a current limiting resistor connected between the power supply and the electrode gap, switching elements that turns on and off application of a voltage from the power supply to the electrode gap, an inductance element connected in series between the switching elements and the electrode gap, and a control unit that controls the switching elements. The control unit causes the switching elements to perform ON/OFF operations according to a switching pattern having an on-pulse time width ( Ton) in which a voltage of the electrode gap can reach a voltage value of the power supply in an on-pulse time and a pause time width ( Toff) equal to or longer than a time width ( tic) of a discharge current flowing during the capacitor discharge and shorter than a cycle ( Tso) of the self-excited oscillation.