Optimization of Process Parameter Using Taguchi's DOE Method in EDM

In view of improvement in electric discharge machining (EDM) process performance, optimization of process parameters assumes significant importance. EDM process performance (i.e. material removal rate, surface finish and tool wear rate) can be improved significantly by selecting optimal combination of input parameters. EDM is capable of making complex cuts on difficult-to-machine materials. The higher degree of accuracy and fine surface quality irrespective of the hardness of the work material make this process valuable. The selection of favorable machining conditions is one of the most important aspects of EDM process owing to the characteristically lower material removal rates. Traditionally, the selection of process parameters is done on experience of operator, handbook and some empirical relations. Due to very complex nature of EDM process, selection of favorable parameters by traditional methods is not satisfactory with specific regard to material removal rate and surface finish. To achieve good surface finish on the tool as well as in the component, optimum process parameters are optimized by using different techniques for improving the quality.