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Machining Characteristics of Micro-EDMed Holes According to Dielectric Fluid, Capacitance and Ultrasonic Vibrations  

Seo, Dong-Woo (한국감정원 대전지점)
Yi, Sang-Min (삼성전자 LCD 총괄 Mobile Display 개발팀)
Chu, Chong-Nam (서울대학교 기계항공공학부)
Park, Min-Soo (서울대학교 대학원 기계항공공학부)
Publication Information
Journal of the Korean Society for Precision Engineering / v.24, no.12, 2007 , pp. 42-49 More about this Journal
Abstract
When micro holes are machined by EDM, machining characteristics of machined holes are changed according to the machining conditions. Typical machining conditions are the kind of dielectric fluids, capacitance and ultrasonic vibrations. They influence electrode wear, machining time, radial clearance and taper angle. In this paper, machined holes whose depths are 300, 500, $1000\;{\mu}m$ are observed for each machining conditions. Using deionized water as a dielectric fluid makes electrode wear small, machining time short, radial clearance large and taper angle small. High capacitance makes electrode wear high. Ultrasonic vibrations make electrode wear large, machining time short, radial clearance small and taper angle small. From the results of experiments, the optimal machining conditions were obtained to machine highly qualified micro holes.
Keywords
Micro-EDM; Deionized Water; Capacitance; Ultrasonic Vibrations; Radial Clearance;
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