Mitsubishi Denki Kabushiki Kaisha

Kazuhiko Uemoto

Yoshihide Kinbara

Atsushi Taneda

Hajime Ogawa

Toshiaki Tanaka

In a power supply apparatus of an electrical discharge machine, a power supply high in efficiency and small in current ripple is provided to achieve a power supply reduced in size and price. In addition, a switching power supply system is used jointly to generate an optional waveform. A first switching device is switched on/off in an optional cycle under the control of a current command value signal corresponding to the waveform shape of a current pulse to be supplied to a machining gap, whereby an optional shape of current pulse is supplied to the machining gap and a current component which compensates for a current ripple generated by said switching at the time of supplying said current is superimposed on said optional shape of current pulse and is supplied to the machining gap.

Method and apparatus for controlling the power supply for electrical

An electric discharge machining apparatus having a shielding mechanism for prevention of an occurrence of radio interference due to electromagnetic waves which are generated during an electric discharge machining operation. The shielding mechanism comprises a plurality of shielding floats at least the surface of which are made of a magnetic material high in magnetic permeability. The floats covers a surface of a machining solution contained in a machining reservoir made of a magnetic material high in magnetic permeability, in such a manner that the shielding floats are in contact with a side wall of the machining reservoir.

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Aichi, Japan

Kazuhiko Uemoto