Experimental investigation on the influence of electrochemical micro-drilling by short pulsed voltage

In this work, a tungsten carbide (WC) pin 50 mu m in diameter was used to drill throughout nickel plates of 200 mu m in thickness by electrochemical micro-machining. A novel pulsed power generator was used to support pulses of nanosecond duration in drilling. The influences of working parameters, such as pulsed duration, applied voltage, pulse frequency, electrolyte concentration, tool feed rates, and hole depth, on the hole overcut and conicity are investigated. A high-quality micro-hole with 11.1-mu m overcut was drilled on a nickel plate of 200 mu m in thickness.