Abstract
In order to determine the transient temperature variation of cutting tool in end milling, the temperature response beneath the rake face is measured using a newly developed infrared radiation pyrometer with two optical fibers connected by a fiber coupler. In up milling, the temperature increases gradually during the cutting cycle and reaches the maximum just after the cutting. In down milling, the temperature increases immediately after the cutting starts and reaches the maximum during the cutting cycle. Calculated temperature variation beneath the rake face in up milling and down milling agrees well with the measured temperature variation.
