Abstract
When cemented carbide tools are used for intermittent cutting, a network of cracks is often formed on the rake face and tool life is drastically reduced. This paper examines the role of thermomechanical phenomena responsible for these cracks. Cutting tests were performed on a lathe, wherein M.S. plates have been cut intermittently in a specially designed workpiece fixture. Both transient cutting forces and tool-chip interface temperature were recorded continuously. It has been found that the magnitude of normal stress in intermittent cutting is much higher when the results are compared with regular cutting, under otherwise identical conditions. Tool forces in intermittent cutting have been noticed to depend strongly on cutting speed and feed rate. A comprehensive picture of carbide tool functioning in intermittent cutting is proposed by presenting the variation of thermo-mechanical loads with cutting speed and feed.
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