222 FRMのSEM内低速二次元加熱切削(OS-2 機械加工(2))

概要

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Orthogonal micro-cutting at elevated temperatures of FRM are performed with SEM direct observation method (in-site observation). The purpose of this study is to make clear the dependence on the workpiece temperature for the cutting mechanism of FRM and fracture of fibers at the plastic deformation zone of orthogonal micro-cutting. The workpiece temperature can be set at random with this micro-cutting device, and in this experiment, it is set at 300, 373, 473 and 573K. And also the cutting direction are classified by the fiber angle (the angle between the cutting direction and the fiber direction), since FRM shows an obvious anisotropic strength depending on the direction of fiber axes. The main results obtained are as follows : In case of the fiber angle 30°, the main fracture of fibers in micro-cutting at elevated temperature with the single point diamond tool are caused by shearing force. But in case of the workpiece temperature 473K or 573K, the power that the matrix is holding the fiber become lower, and the fiber is bent at the larger area. As the result, the bent fiber wears the flank, the flank wear is bigger than the case of the workpiece temperature 300K.
一般社団法人日本機械学会の論文
2000-03-16