Power source apparatus for electric discharge machining

Abstract

Abstract PURPOSE:To reduce power loss and permit the working with fine surface roughness and high efficiency by arranging switching elements onto a working electrode side and a workpiece side and connecting the diodes in the direction for absorbing the working electric current. CONSTITUTION:When switching elements 5a and 5b are closed, a dc voltage is applied into the working gap between a working electrode 1 and a workpiece 2 from a dc constant voltage source 3, and electric discharge in the working gap is started. When, the switching elements 5a and 5b are opened, the voltage Vl is induced by the energy stored in a floating inductance 4. When this voltage Vl exceeds the power source voltage E, diodes 7a and 7b conduct, and a working electric current is regenerated on the power source side through the diodes 7a and 7b. Since the above-described energy is regenerated onto the power source side except the energy consumed in the working gap, electric power loss can be reduced. further, the pulse width of the working electric current can be reduced, and the work with a little electric discharge energy is permitted, the surface roughness of the worked surface can be improved.

Inventors

• 👤 Kazuo Tsurumoto
• 👤 鶴本　和夫
• 👤 Yasushi Endo
• 👤 遠藤　靖士

Bibliographic Details