Using solid carbide cylindrical milling cutter with TiAlN coating

P20 steels(heat treated to 41HRC and 32HRC) were machined at a high milling speed.The morphology of the chips

chip microhardness

chipping temperature

and the milling forces at various speeds are investigated.The cutting parameters involved are: cutting speeds in the range of 151 m/min to 942 m/min

feed of 0.1 mm/tooth

axial cutting depth of 1.0 mm

and radial width of 1.0 mm.The results show that saw-tooth chips are formed during high speed milling of hardened P20 steels at 41HRC and 32HRC.The chipping temperature increases with the increase of cutting speed.The influence of the cutting speed and the workpiece hardness on cutting force and chip deformation is significant.