Browse > Article

Control of Taper Shape in Micro-Hole Machining by Micro-EDM  

Kim Dong Jun (서울대학교 대학원 기계항공공학부)
Yi Sang Min (서울대학교 대학원 기계항공공학부)
Lee Young Soo (서울대학교 정밀기계설계공동연구소)
Chu Chong Nam (서울대학교 기계항공공학부)
Publication Information
Journal of the Korean Society for Precision Engineering / v.22, no.4, 2005 , pp. 52-59 More about this Journal
Abstract
When a micro hole is machined by EDM with a cylindrical electrode, the hole diameter is different at the inlet and the outlet of the micro hole. The taper shape of the micro hole is caused by not only wear of the electrode but the eroded particles. The eroded particles cause secondary discharge during machining the micro hole. As a result, the diameter of the inlet becomes larger than that of the outlet. In this paper, a new method is proposed to reduce the difference in diameter between the inlet and the outlet of the hole. Observed was that the feed depth and machining time affect the formation of taper shape On this experimental basis, ultrasonic vibration was applied to reduce machining time, and capacitance was changed during machining to use the difference in discharging energy of different capacitances. Using the proposed method, a straight micro-hole was fabricated.
Keywords
Micro-EDM; Taper shape; Ultrasonic vibration; Capacitance change;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Pahnit, S., Dan, K. and Mart, G. A., 'An Experimental Study of Microfabricated Spark Gaps: Wear and Erosion Characteristics,' Journal of Micromechanics and Microengineering, Vol. 11, No. 3, pp. 165-174, 2001   DOI   ScienceOn
2 Sheu, D. Y., Masuzawa, T. and Fujino, M., 'Machining of Deep Microholes by EDM,' International Conference on Precision Engineering, Taipei, Taiwan, pp. 593-596, 1997
3 Masuzawa, T., Jujino, M. and Kobayashi, K., 'Wire Electro-discharge Grinding for Micro Machining,' Annals of the CIRP, Vol. 34, No.1, pp. 431-424, 1985   DOI
4 Kagawa, M., 'Study on Straight Micro Hole Machining by EDM Using Stepped Electrode,' Journal of the Japan Society for Precision Engineering, Vol. 65, No. 12, pp. 1793-1797, 1999   DOI   ScienceOn
5 Je, S. W., 'Deep hole micro EDM with Ultrasonic Vibration,' Ph.D. dissertation, School of Mechanical and Aerospace Engineering, Seoul National University, 2003
6 Yeo, S. H. and Tan, L. K., 'Effects of Ultrasonic Vibrations in Micro Electro-discharge Machining of Micro Holes,' Journal of Micromechanics and Microengineering, Vol. 9, No. 4, pp. 345-352, 1999   DOI   ScienceOn
7 Cho, P. J., Yi, S. M., Choi, D. K. and Chu, C. N., 'Characteristics of RC Circuit with Transistors in Micro-EDM,' Journal of the KSPE, Vol. 21, No. 12, pp. 44-51, 2004