• Title/Summary/Keyword: High-speed micro-EDM

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Characteristics of RC circuit with Transistor in Micro-EDM (트랜지스터 부착 RC 방전회로의 마이크로 방전가공 특성)

  • 조필주;이상민;최덕기;주종남
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.235-240
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    • 2002
  • 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.

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Characteristics of RC Circuit with Transistors in Micro-EDM (트랜지스터 부착 RC 방전회로의 마이크로 방전가공 특성)

  • Cho Pil Joo;Yi Sang Min;Choi Deok Ki;Chu Chong Nam
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.12
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    • pp.44-51
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    • 2004
  • 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.