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왕덕현,우정윤 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.1
Experimental study of die-sinking electrical discharge machining(EDM) was conducted With rotating electrode system including inside hole for increasing the material removal rate(MRR). With the help of dielectric fluid flow through the inside according to the different internal diameter of the hole, the molten workpiece debris could be removed and flushed out during the EDM. Cold die alloy(SKD-11) was executed for different peak current and duty factor. From this study, the MRR was found to be increased with the peak current. The more MRR was obtained for the case of electrode inside diameter of l0mm, but the MRR was decreased as the diameter near at the 4mm and 6mm. The values of surface roughness and roundness were analyzed under various conditions, and these were affected by the inside diameter change of electrode.
산화알루미늄-탄화티타늄(Al₂O₃-TiC) 세라믹 복합체의 방전가공
왕덕현,우정윤,윤존도,고철호,안영철,정영습 경남대학교 신소재연구소 1996 論文集 Vol.7 No.-
도전성 탄화티타늄 33무게%를 포함하는 산화알루미늄基 세라믹 복합체에 대한 방전가공을 시도하고 최적조건과 방전메카니즘을 조사하였다. 방전조건으로 전류 7-15A, 듀티팩터 0.24-0.45, 인가전압 40V를 사용하여 방전가공을 실시하였는데, 전류가 7A이하, 듀티팩터가 0.30이하일 때 가공이 잘 되었으며, 그 이상에서는 표면 파괴가 일어났다. 방전전류와 듀티팩터가 증가하면 공작물 제거속도는 증가하나 표면 거칠기도 역시 증가하는 것으로 나타났다. 방전가공 표면에 대한 미세구조 분석을 통하여 방전가공 메카니즘은 용융증발기구로 분석이 되었다. Alumina ceramic matrix composite containing electro-conductive titanium carbide of 33 weight % was machined by electrical discharge machining (EDM) method. The machining condition was 7-15A of current, 0.24-0.45 of duty factor, and 40V of applied voltage. When the current and duty factor were 7A and 0.30 or lower, respectively. the specimen were machined successfully. When the current and duty factor were higher. the specimen showed surface damage and fracture after machining. As the current and duty factor increased. the material removal rate(MRR) and maximum surface roughness increased. implying that the machining condition would be selected according to the requirement whether high speed machining or good surface finish is needed. By the microstructure analysis on the machined surface, the mechanism of machining was determined to be melting and evaporation.