Abstract
The durability of a cutting tool depends not only on the strength of its cutting edge, but also greatly on the rise in temperature due to the friction resistances and the cutting force at the contact parts of the cutting edge and the surface of steel to be cut. In the present study, four different kinds of high speed steels have been used and three kinds of materials have been chosen to cut. The following facts have been revealed in this experiment : (1) The increment of cutting speed, of cutting depth and feed, raises the cutting temperature quickly at first, but thee rate of the rise in temperature rise retards after a certain degree reached. (2) The rate of the rise in temperature differs with the shape of the cutting edge as it does with the cutting force. (3) The machinability of materials can be surmised from the rate of the rise in temperature. (4) The rise in temperature on the bite is nearly proportional to the cutting force, but not always to the durability of the cutting tool.
