Realization of High-speed Micro EDM for High-aspect-Ratio Micro Hole with Mist Nozzle

Abstract

Micro EDM technology is widely used in micro hole machining for its small force and high precision. However, the slow machining speed and large tool wear are the two major problems. In this research, a mist nozzle, whose central axis is coaxial with the tool axis, was proposed to evacuate debris from the narrow gap area in micro-EDM for high-aspect-ratio holes and to improve the machining speed and accuracy. In order to verify the effectiveness of the mist nozzle, experiments by supplying mist jet and water jet, and by changing the flow rate of deionized water were carried out. By comparing the machining results of micro hole drilling with mist jet and water jet, the effectiveness of the mist nozzle was confirmed.