Abstract
The effect of porosity on tool life in cutting by cemented carbide tip (P20) was investigated using two kinds of sintering iron have different porosity at the various cutting depth. The result was that the cause of shortening tool life was rather porosity than hardness of specimen in a cutting condition. Besides tool life was shortened in cutting at the high cutting depth and the high cutting velocity condition. To sum up, tool life was shortened at the condition of high cutting speed and high cutting depth. These result were likely caused by heat shock in interrupted cutting.
