EDM Characteristics of Inconel 718 and Using Control Chart for Process Stable

This study investigates the optimization of micro milling EDM process parameters to achieve multiple performance characteristics (low electrode depletion (ED), high material removal rate (MRR) and low overcut) in the Inconel 718 by the Grey-Taguchi method. Experimental results show that the electrode depletion decreased from 0.56 to 0.52 10-8 mm3/min, the material removal rate increased from 0.47 to 1.68 10-8 mm3/min and the overcut decreased from 1.27 to 1.19 μm under optimal micro milling EDM process parameters. Furthermore, control charts tell us when special causes of variation are impacting machining process. Control charts are basic and powerful tools in statistical process control and are widely used to control various industrial processes. The aim of statistical process control is to explore the predictability of a process. It was found that the EDM process and product characteristics are stable over time.