Abstract
Fluctuation in the chip flow velocity on the tool with time affects heat generation on the rake face of the tool, tool temperature, tool wear, tool life and surface quality of the workpiece. In the conventional cutting theories, chip flow velocity is assumed to be constant under constant cutting speed. Although a considerable number of studies on the cutting force have been made over the past decades, there have been little studies that tried to observe the chip flow velocity with time. This paper evaluates the effect on thermal fatigue of tool of the fluctuations of chip flow velocity and the cutting force through cutting experiments with a high speed camera and tool dynamometer. Changes of tool temperature and stress distribution during very short time, which are considered to have significant effects on the tool wear mechanism, are also quantitatively analyzed by finite element method.
