Feasibility study of micro-slit EDM machining using pure water |
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Authors: | Ching-Tien Lin Han-Ming Chow Lieh-Dai Yang Yuan-Feng Chen |
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Affiliation: | (1) Department of Mechanical Engineering, Nan Kai Institute of Technology, Nan Tou, Taiwan, Republic of China;(2) Department of Industrial Engineering and Management, Nan Kai Institute of Technology, No. 568, Chung Cheng Rd, Tsaotun, Nan Tou, Taiwan, Republic of China |
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Abstract: | This study addresses micro-slit EDM machining feasibility using pure water as the dielectric fluid. Experimental results revealed that pure water could be used as a dielectric fluid and adopting negative polarity EDM machining could obtain high material removal rate (MRR), low electrode wear, small slit expansion, and little machined burr, compared to positive polarity machining. In comparing kerosene versus pure water, pure water was observed to cause low carbon adherence to the electrode surface. Also discharge energy does not decrease and the discharge processes are not interrupted. Therefore, MRR was higher, and related electrode wear ratio compared to kerosene use was lower. In a continual EDM with multi-slit machining, kerosene will cause carbon element adherence, creating an initially high MRR and electrode wear, with rapid decline. However, pure water will not cause carbon element adherence on the electrode surface, so MRR and electrode wear is always stable in this process. |
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Keywords: | Micro-slit Electrical discharge machining (EDM) Dielectric fluid Material removal rate (MRR) Electrode wear |
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