Browse > Article

Micro Hole Machining by EDM Using Insulated Tool Combined with Ultrasonic Vibration of Dielectric Fluid  

Park, Min-Soo (Dept. of Product Design and Manufacturing Eng., Seoul National University of Science and Technology)
Chung, Do-Kwan (School of Mechanical and Aerospace Engineering, Seoul National University)
Lee, Kang-Hee (School of Robot and Automation Engineering, Dongyang Mirae University)
Chu, Chong-Nam (School of Mechanical and Aerospace Engineering, Seoul National University)
Publication Information
Journal of the Korean Society of Manufacturing Technology Engineers / v.20, no.2, 2011 , pp. 180-186 More about this Journal
Abstract
This paper describes a micro electrical discharge machining (MEDM) technique that uses an insulated tool in combination with ultrasonic vibration to drill micro holes. As the machining depth becomes deeper, the dispersion of debris and circulation of the dielectric fluid are difficult to occur. Consequently, machining becomes unstable in the machining region and unnecessary electrochemical dissolution and secondary discharge sparking occur at the tool side face. To reduce the amount of unnecessary side machining, an insulated tool was used. Ultrasonic vibration was applied to the MEDM work fluid to better remove debris. Through these methods, a $1000\;{\mu}m$ thick stainless steel plate was machined by using a $73\;{\mu}m$ diameter electrode. The diameters of the hole entrance and exit were $96\;{\mu}m$ and $88\;{\mu}m$, respectively. It took only 351s to completely drill one hole.
Keywords
MEDM; Tool Insulation; Ultrasonic Vibration;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Masuzawa, T., Fujimoto, M., and Kobayashi, K., 1985, "Wire Electro-Discharge Grinding for Micro Machining," Annals of the CIRP, Vol. 34, pp. 431-434.   DOI   ScienceOn
2 Park, S. J., Ahn, H. M., and Lee, K. S., 2005, "Fabrication of Micro Tool Electrode for Machining Micro Structures using Wire Electrical Discharge Grinding (WEDG)," Journal of the Korean Society of Machine Tool Engineers, Vol. 14, pp. 13-20.
3 Masuzawa, T., 2000, "State of the Art of Micromachining," Annals of the CIRP, Vol. 49, pp. 473-488.   DOI   ScienceOn
4 Li, C. Y., Xu, X. Z., and Tigwell, D., 1995, "A Simple and Comprehensive Method for the Construction, Repair and Recycling of Single and Double Tungsten Microelectrodes," J. Neuroscience Methods, Vol. 57, pp. 217-220.   DOI   ScienceOn
5 Dolbier, Jr W. R., and Beach, W. F., 2003, "Parylene- AF4: A Polymer with Exceptional Dielectric and Thermal Properties," J. Fluorine Chem, Vol. 122, pp. 97-104.   DOI   ScienceOn
6 Park, B. J., Kim, B. H., and Chu, C. N., 2006, "The Effects of Tool Electrode Size on Characteristics of Micro Electrochemical Machining," Annals of the CIRP, Vol. 55, pp. 197-200.   DOI   ScienceOn
7 Masuzawa, T., and Tanaka, K., 1983, "Water-Based Dielectric Solution for EDM," Annals of the CIRP, Vol. 32, pp. 119-122.   DOI   ScienceOn
8 Chung, D. K., Kim, B. H., and Chu, C. N., 2007, "Micro Electrical Discharge Milling using Deionized Water as a Dielectric Fluid," J. Micromechanics and Microengineering, Vol. 17, pp. 867-874.   DOI   ScienceOn
9 Hung, J. C., Lin, J. K., Yan, B. H., Liu, H. S., and Ho, P. S., 2006, "Using a Helical Micro-Tool in Micro- EDM Combined with Ultrasonic Vibration for Micro- Hole Machining," J. Micromechanics and Microengineering, Vol. 16, pp. 2705-2713.   DOI   ScienceOn
10 Maeng, H. Y., Park, K., and Shin S. H., 2006, "Improvements of Electro Discharge Machining Process using Side Flushing Devices," Journal of the Korean Society of Machine Tool Engineers, Vol. 15, pp. 23-31.
11 Masuzawa, T., Tsukamoto, J. and Fujino, M., 1989, "Drilling of deep microholes by EDM," Annals of the CIRP, Vol. 38, pp. 195-198.   DOI   ScienceOn
12 Zhao, W., Wang, Z., Di, S., Chi, G., and Wei, H., 2002, "Ultrasonic and Electric Discharge Machining to Deep and Small Hole on Titanium Alloy," J. Materials Processing Technology, Vol. 120, pp. 101-106.   DOI   ScienceOn
13 Yeo, S. H., and Tan, L. K., 1999, "Effects of Ultrasonic Vibrations in Micro Electro-Discharge Machining of Microholes," J. Micromechanics and Microengineering, Vol. 9, pp. 345-352.   DOI   ScienceOn
14 Je, S. W., 2003, Deep Hole Micro EDM with Ultrasonic Vibration, A Thesis for a Doctorate, Seoul National UniversitY, Republic of Korea.