Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Denki K.k.

Akiyasu Ito

Kazuo Tsurumoto

Hiroaki Morishita

Munenori Kimura

Yutaka Terada

Shouichi Nagasaka

A discharge-processing power-source assembly, in which a processing liquid is interposed at a minute gap defined between a workpiece and an electrode, and processing is executed by discharge energy, comprises a D.C. power source supplying electric energy to the minute gap, switching elements for converting D.C. voltage from the D.C. power source to pulse voltage, and a snubber circuit for protecting the switching elements. The discharge-processing power-source assembly further comprises a relay contact for cutting off the snubber circuit when a switching frequency is high.

Discharge-processing electric power-source assembly

Accurate control of the tension of a wire electrode in a wirecut electrical discharge machine is achieved by eliminating a direct-current (DC) component from a speed difference signal between a braking section and a recovery section of the machine. The DC component of the speed signal which is eliminated is associated with the stretching of the wire electrode while under tension. As a result, the tension can be maintained constant dynamically as well as statically, thereby improving machining accuracy.

Wirecut electrical discharge machine

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Aichi, Japan

Akiyasu Ito