微小エネルギRC放電加工における持続アーク発生機構

抄録

This paper deals with the mechanism of the continuous arc, occurring in micro-energy EDM by RC circuit. A statistic analysis is made about the critical condition of arc occurrence. Then, the result and some mathematical inquiry give a new theory about the condition.
The experimental result shows that the inductance of discharge circuit loop has great influence on arc occurrence. The phenomenon is difficult to be applied by the ion-destruction theory. While, a calculation of discharge current with a new assumption of the gap voltage gives close agreement with the real wave form. Moreover, it represents the stage that the type of the current changes from a pulse to a continuous arc.
These results shows that the change occurs mainly in order to the circuit condition. A calculation based on this decision was achieved, and clearly agreed with the real relation between the critical value of charging resistance and the inductance of discharge loop for various values of discharge capacity. This result makes it possible to design a RC circuit, avoiding the undesirable continuous arc.