Journal of the Korean Society of Manufacturing Technology Engineers (한국생산제조학회지)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
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Micro Hole Machining by EDM Using Insulated Tool Combined with Ultrasonic Vibration of Dielectric Fluid

가공액의 초음파 진동 및 절연 공구를 이용한 미세방전가공

  • 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)
  • Received : 2009.12.31
  • Accepted : 2010.09.13
  • Published : 2011.04.15
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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

References

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