Electrolysis Free Micro EDM in Water Using Electrostatic Induction Feeding Method

Abstract

This paper describes the machining characteristics of electrolysis-free micro EDM in water using the electrostatic induction feeding method. With the electrostatic induction feeding method, if deionized water is used for the working liquid, electrolysis can be prevented because bipolar voltage is applied to the working gap. Results of micro-holes drilling showed that the material removal rate with deionized water is higher than that with oil, and the oversize of holes machined in deionized water is smaller. Moreover, micro-holes could be drilled successfully even in a tap water with the oversize of several micrometers using this method.

Ringing Effect and Reversed Current Analysis of RC-Pulse Generator in Electrical Discharge Machining

“…T, and M. Kunieda. [4] developed a electrolysis free micro-EDM method by connecting a pulse power supply and a RC-circle in series. Though many researches have been carried out, little research was done about the ringing effect.…”

Study on Influence of Stray Inductance in Micro EDM Using Electrostatic Induction Feeding Method

“…Hence, neither localized discharge nor abnormal arc occurs easily despite the high duty cycle. Experimental results showed that higher material removal rate and more uniform discharge energy can be obtained in the electrostatic induction feeding method compared to the conventional relaxation pulse generator [6]. By theoretical analysis and experimental investigations, the influence of the stray capacitance in the circuit on the discharge energy has been examined [7].…”