전극마모율을 이용한 공구 전극의 미세방전가공

Abstract

Moving block electrode discharge grinding (MBEDG) is one of the electrical discharge machining (EDM) processes that have been used to fabricate micro tool electrodes. Usually, wire electrode discharge grinding is preferred among the tool fabrication methods; however, it is not easy to control wire tension precisely and prevent wire vibration. Because MBEDG uses block electrodes instead of wires, it is possible to fabricate very straight micro tool electrodes. However, the block electrode assumes a taper shape after the tool-making process and the block surface is not reusable. In this study, we investigated the tool wear ratio between the block and tool materials. Based on the wear ratio, we proposed a tool fabrication process to prevent tapering of the block electrode.