Abstract
Keywords: hardened steel, cutting forces, PCBN, wear, depth of cut, feed rate, cutting speed
In this study, the influences of cutting edge wear, depth of cut, feed rate and cutting speed on cutting forces in finish turning of hardened 205 Cr115 steel were experimentally investigated. In order to find out a mathematical relation of polynomial type which has to describe how the cutting forces and specific cutting forces components by the 4 considered influence factors, it has been used a composed, central with 25 experiences program. These research results show that, for the domains of variation chosen for the considered parameters ap, f, Vc and VB, the increase of depth of cut, feed rate and flank wear increase the cutting forces components Ff, Fp and Fc and the cutting speed influence in a smaller measure these forces. Instead, the specific cutting forces Kf, Kp and Kc are rising once with the flank wear and decrease once with the advance of depth of cut. The influence of feed rate and cutting speed on the specific cutting forces is smaller. The ratio of forces Fp/Fc is rising once with the flank wear.