Multi - characteristics Optimization of hard turning parameters for ohns steel

Wiper insert geometry is usually used in milling and turning operations because of its unbeaten ability to provide a better-quality surface finish. Since wiper insert provides a excellent surface finish during hard turning operation it can be considered as an potential substitute for grinding operation. This paper provides an optimization approach for hard turning process of OHNS steel. During the investigation turning trials are conducted on OHNS steel specimens using conventional and wiper insert of 0.8 and 1.2 mm nose radius. Design of Experiment has been done using Taguchi based L36 array with five process parameters namely type of insert, nose radius, speed (RPM), depth of cut and feed. Five responses are analyzed which are roughness parameters Ra and Rt, metal removal rate, power consumption and cycle time. For optimization of process parameters for above mentioned responses Grey Relational analysis is used. The optimized process parameters during the investigation are Wiper Insert geometry with nose radius 1.2 mm, speed of 1200 RPM, feed of 0.2 mm/rev. and depth of cut 0.1 mm.