Abstract
Magnitudes of the stresses in the cutting edge during machining metals were calculated applying stress functions based on the theory of elasticity, and the accuracy of calculation was testified by the experiments on the destruction of the actual cutting edges under certain cutting conditions. In the case of machining chilled cast iron with some WC-Co cemented carbides, the results of two experiments are compered with the theoretical values. The two tests are carried out with the following purposes : 1. To find the minimum lip angle which endures the cutting force when the cutting speed is low. 2. To find the compressive strength of cutting edge for the destruction due to thermal softening when the lip angle is constant. The theoretical values are found to be in good agreement with the experimental values in spite of many hypotheses.
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