The use of the orthogonal array with grey relational analysis to optimize the electrical discharge machining process with multiple performance characteristics

In this paper a new approach for the optimization of the electrical dischar ge machining (EDM) process with multiple performance characteristics based on the orthogonal array with the grey relational analysis has been studied. A grey relational grade obtained from the grey relational analysis is used to solve the EDM process with the multiple performance characteristics. Op timal machining parameters can then be determined by the grey relational gr ade as the performance index. In this study, the machining parameters, name ly workpiece polarity, pulse on time, duty factor, open discharge voltage, discharge current, and dielectric fluid are optimized with considerations o f multiple performance characteristics including material removal rate, sur face roughness, and electrode wear ratio. Experimental results have shown t hat machining performance in the EDM process can be improved effectively th rough this approach. (C) 2001 Elsevier Science Ltd. All rights reserved.