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Characteristics of RC Circuit with Transistors in Micro-EDM  

Cho Pil Joo (삼성전자 메카트로닉스센터)
Yi Sang Min (서울대학교 대학원 기계항공공학부)
Choi Deok Ki (강릉대학교 정밀기계공학과)
Chu Chong Nam (서울대학교 기계항공공학부)
Publication Information
Journal of the Korean Society for Precision Engineering / v.21, no.12, 2004 , pp. 44-51 More about this Journal
Abstract
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.
Keywords
RC circuit with transistors; Continuous arc discharge; Normal arc discharge; High-speed micro-EDM;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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1 Guitrau, E. B., 'The EDM Handbook,' Hanser Gardner Publications, Cincinnati, 1997
2 Takahata, K. and Gianchandam, Y. B., 'Batch Mode Micro-EDM for High-Density and High-Throughput Micromachining,' Proc. IEEE Micro Electro Mechanical System Workshop, pp. 72-75, 2001   DOI
3 Masaki, T., Kawata, K. and Masuzawa, T., 'Micro Electro-Discharge Machining and Its Applications,' Proc. IEEE Micro Electro Mechanical System Workshop, pp. 21-26, 1990   DOI
4 Yu, Z., Masuzawa, T. and Fujino, M., '3D Micro-EDM with Simple Shape Electrode - Part 1 : Machining of Cavities with Sharp Corners and Electrode Wear Compensation,' Int. J. of Electrical Machining, No.3, pp. 7-12, 1998
5 Tsai, Y. Y. and Masuzawa, T., 'An Index to Evaluate the Wear Resistance of the Electrode in Micro-EDM,' Journal of Material Processing Technology, Vol. 149, pp. 304-309, 2004   DOI   ScienceOn
6 Micro machining technology editorial committee, 'Micro Machining Technology,' Kigeon Publishing co., Seoul, 1993