Theoretical Analysis of EDM at Low Voltage

摘要

In micro EDM, the discharge at low open-circuit voltage can be realized by using RC pulse power supply. Through theoretical analysis, the influences of working parameters on machining performances are expounded for micro EDM at low voltage. When stray capacitance is determined, reducing voltage can effectively decrease the single pulse energy. Keeping single pulse energy at a same value, reducing voltage will lead to the decrease of MRR. While keeping MRR at a same value, the capacitance must be enlarged at the same time when reducing the voltage, which will cause the single pulse energy to augment and the machined surface to roughen. Reducing the voltage can minish the discharge gap and enhance the precision and micro degree of machined holes, but the microelectrode easily contacts and collides with the machining surface, which will cause the short current or the damage of the microelectrode. This study provides a theoretical reference for micro EDM practice.