THE INVESTIGATION OF TOOL LIFE AND WEAR IN THE MACHINING OF NON-HEAT TREATED AND SPHEROIDIZED AISI52100 BEARING STEEL WITH DIFFERENT CUTTING TOOLS

In this study, the effects of main cutting parameters and the effects of work piece hardness and tool hardness on tool life and tool wear have been investigated in the machining of non-heat treated and spheroidized aisi52100 bearing steel by different cutting tools. three types of cutting tools were used for the present work. these were mixed alumina ceramic with an al2o3 (70%) +tic (30%) matrix, pvd-tin coated mixed ceramic with a matrix of al2o3 (70%) +tic (30%) and cvd ti(c, n) +al2o3+ti(c, n) +tin coated carbide tools. machining tests were carried out under dry condition. taguchi experimental design technique was used and l18 (2^1x3^7) orthogonal array was selected to problem conveniently. effects of control factors and their interactions on tool life were explained by three dimensional (3d) surface contour graphs. types of tool wear were determined by observation of shown worn surfaces with a scanning electron microscope (sem). ceramic cutting tools showed the best tool life performance than the other tools in the machining of non-heat treated aisi52100 bearing steel and uncoated ceramic and coated carbide tools followed it, respectively. on the other hand; coated carbide tools showed better tool life performance than others in the machining of spheroidized aisi52100 bearing steel. whereas a uniform-regular flank wear was occurred in the machining of spheroidizing bearing steel with the all tools in general, flank wear and crater wear was increased significantly in the machining of non-heat treated bearing steel.