Optimization of machining parameters in turning process of mdn431 using ti-multilayer coated tool

Abstract

WC-Co Cutting tool inserts are coated with tailored composition of Ti/TiCN/TiN/TiCN/TiN using cathodic arc evaporation technique. MDN431 is one of highly alloyed steel with tailored mechanical properties. MDN431 material is machined with Ti/TiCN/TiN/TiCN/ TiN coated and uncoated Co-based WC tool inserts. Machining parameters; cutting speed (398-625rpm), feed rate (0.093-0.175mm/rev) and depth of cut (0.1-0.5mm) and experiments are conducted according to response surface methodology center composite rotatable design. Surface roughness and cutting forces are measured for each iteration and the same analyzed for significance. Result reveals that for optimum surface roughness is obtained at the condition of high speed, low feed and low depth of cut. For optimum cutting force high speed, low feed and low depth of cut is preferred. Coated tools performed better in the study with increased tool life, reduced cutting force & surface roughness. At the optimum machined conditions machined surface are analyzed using optical profilometer. Central composite rotatable design developed mathematical models for cutting force and surface roughness for the prediction of results. The predicted results are minimum error and developed model is adequate for further usage. International Journal of Modern Manufacturing Technologies.