Characteristics of RC circuit with Transistor in Micro-EDM

트랜지스터 부착 RC 방전회로의 마이크로 방전가공 특성

  • 조필주 (서울대 대학원 기계항공공학부) ;
  • 이상민 (서울대 대학원 기계항공공학부) ;
  • 최덕기 (강릉대 정밀기계공학과) ;
  • 주종남 (서울대 기계항공공학부)
  • Published : 2002.10.01


In micro-EBM, it is well blown that RC circuit is suitable for 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, if very low, continuous (or normal) arc discharge occurs, then increases electrode wear and reduces machining speed remarkably. In this paper, RC circuit with transistor is used to micro-EDM. Experimental results show that RC circuit with transistor can cut off continuous (or normal) arc discharge effectively if duty factor and switching period of transistor are set up optimally. Through experiments with varying charge resistance, it can be known that RC circuit with transistor has about two times faster machining speed than that of RC circuit. Especially, it has prominent rise-effect of machining speed in low unit discharge energy, so that a high-quality and high-speed micro-EDM can be realized through RC circuit with transistor.