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정도관(Chung, Do-Kwan),김보현(Kim, Bo-Hyun),주종남(Chu, Chong-Nam) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Micro EDM milling using deionized water as dielectric fluid was investigated. After machining micro grooves using deionized water with different voltage. capacitance. and resistivity of deionized water, machining characteristics were investigated. The wear of a tool electrode and the machining time can be reduced by using deionized water instead of kerosene. Micro hemispheres were machined in deionized water and kerosene and their machining characteristics were compared.
Min-Soo Park(박민수),Do-Kwan Chung(정도관),Kang-Hee Lee(이강희),Chong-Nam Chu(주종남) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.2
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 ㎛ thick stainless steel plate was machined by using a 73 ㎛ diameter electrode. The diameters of the hole entrance and exit were 96 ㎛ and 88 ㎛, respectively. It took only 351 s to completely drill one hole.