| 摘要 |
PURPOSE:To obtain a power source with a stable output characteristic and a good-quality and uniform machining surface by providing a coupling capacitor and a coupling coil in series in a circuit, and a second capacitor in a part across poles, and setting their capacitances and inductance at proper values respectively. CONSTITUTION:When the on and off operation of a switching element 2 is repeated at a few MHz by means of a driving circuit 3, a voltage on the both ends of capacitors C2, C3, i.e., a high-frequency AC voltage is generated across poles 6, to carry out electric discharge machining. The characteristic of the output voltage with respect to variation in floating capacitance 8 depends on the capacitances of a coupling capacitor 9 and a capacitor 11, and the inductance of a coupling coil 10. Accordingly, by properly setting the values of these capacitances and inductance, the output characteristics of a machining power source becomes stable, always obtaining a good-quality and uniform machining surface. Also, a tuning system for making a switching frequency variable can be eliminated.
|
