Micro Hole Machining with High Aspect Ratio by using High-Speed Rotation Tool

Abstract

We developed the machine that uses a magnetic gear for the transmission mechanism. Magnetic gear makes it possible to transmit the torque without contact. By this mechanism, this machine can avoid breakage of micro drilling tools. If in order to machine the deep micro hole drilling, it is necessary to high-speed rotation of the tool. However, high-speed rotation tool is to the breakage for the resonance frequency of the tool. And it is also necessary to consider the whirling of the tool by its length. In this study, we machined deep micro hole of high aspect ratio by using drilling and micro electrical discharge machining (EDM). We investigate the machining characteristics, that are the machining speed and the electrode wear in micro EDM.