抄録
The demand for usage of ductile cast iron is increasing. Because ductile cast iron is superior to gray cast iron in mechanical properties. Previous studies show using a CBN tool makes high-speed cutting possible in gray cast iron. But in ductile cast iron, high-efficiency cannot be achieved because of excessive flank wear. Thus, in this study, it aimed at clarifying the wear factor of the CBN tool in high-speed cutting of ductile cast iron. In our previous report, it found out that the wear produced in ductile cast iron was accumulation of small chipping. Also, it was clarified that the wear mechanism was subject to a mechanical factor, because the wear position and size on cutting edge changed by tool engagement and disengagement conditions. Then, in this paper, the effect of tool material property on tool wear during high cutting speed was examined. As the result of experiments, it was found out that it was possible to decrease the chipping using the CBN tool with high transverse-rupture strength.
