Comparative study of surface roughness in milling AISI D2 steel using PVD coated and uncoated tungsten carbide insert

This paper comparatively investigates the effect of cutting speed and feed rate on the surface roughness of AISI D2 steel using uncoated and PVD coated inserts in milling operation under dry condition. The response surface methodology (RSM) with a Central Composite Design (CCD) was employed in the experiment to determine the optimum control variables which are cutting speed and feed rate. The optimum condition required for obtaining the minimum surface roughness when milling AISI D2 steel was cutting speed of 100.38 m/min, feed rate of 0.1 mm/tooth, axial depth of cut of 1.5 mm and radial depth of cut of 2.5 mm using PVD coated insert which resulted in a surface roughness of 0.129 mu m.