切削工具のぜい性損傷に関する破壊力学的研究(第2報) : 断続切削におけるぜい性損傷に起因する工具寿命の解析

概要

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The tool life caused by brittle failure in interrupted cutting is analyzed by the application of the fracture mechanics theory. Fatigue crack propagation characteristics which are required in the analysis are determined for cemented carbide P20 using the single notched beam specimen in threepoint bend test. Fractographic examinations suggest that the mechanism of brittle failure in interrupted cutting is substantially similar to that in fatigue crack propagation process. The linear relationship on logarithmic scales is obtained between the rate of the fatigue crack propagation and the stress intensity factor range. The analytical results show that the tool life increases with the increase in the ratio of vertical component to horizontal component in cutting force, and also increase in the wedge angle and the rake angle of the cutting tool.
公益社団法人精密工学会の論文
1983-10-05