Characteristics of RC Circuit with Transistors in Micro-EDM

트랜지스터 부착 RC 방전회로의 마이크로 방전가공 특성

  • 조필주 (삼성전자 메카트로닉스센터) ;
  • 이상민 (서울대학교 대학원 기계항공공학부) ;
  • 최덕기 (강릉대학교 정밀기계공학과) ;
  • 주종남 (서울대학교 기계항공공학부)
  • Published : 2004.12.01


In a micro-EDM, it is well known that an RC circuit is suitable as a discharge circuit because of its low pulse width and relatively high peak current. To increase machining speed without changing unit discharge energy, charge resistance should be decreased. But, when the resistance is very low, continuous (or normal) arc discharge occurs, electrode wear increases and machining speed is reduced remarkably. In this paper, an RC circuit with transistors is used in a micro-EDM. Experimental results show that the RC circuit with transistors can cut off a continuous (o. normal) arc discharge effectively if the duty factor and switching period of the transistor are set up optimally. Through experiments with varying charge resistances, it is shown that the RC circuit with transistors has about two times faster machining speed than that of an RC circuit.



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