Tool Wear Mechanism in Interrupted Cutting Conditions

In this study the machinability of ductile iron having ferritic structure was examined in interrupted cutting conditions. For this purpose, cylindrical samples with 1, 2, and 4 axial slots were prepared. Uncoated cemented carbide cutting tool was used in this work. Two different cutting speeds, feed rate and depth of cut were chosen as cutting parameters. According to results, the number of slots seriously affects the tool wear. Increasing the number of slots results in a decrease in the dimension of chip. Another result observed during the tool wear experiments was that increasing the number of slots results in increase of flank wear. However, the cutting tool wears out rapidly at higher feed rate or depth of cut when one or two slotted workpiece are used. Scanning Electron Microscope (SEM) and Energy Dispersive X-ray microanalysis (EDX) of the worn tools showed that abrasive, adhesion and oxidation wear mechanisms are predominant in the machining of continuous and interrupted cutting of ductile iron.