TiAl金属間化合物の機械的強度に及ぼす切削時のエッジおよび仕上げ面の欠陥の影響

概要

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This paper elucidates the formation mechanism of breakouts at the edge of workpiece in cutting of titanium aluminide intermetallic compounds. Furthermore, the relationships between the mechanical strength and the defects including the breakouts and cracks on edge and finished surface is clarified. The results obtained from this study are as follows: The breakouts are formed by propagation of the crack caused by lamellar structure of workpiece. Four-point bending tests in which two types of specimen are prepared, the cutting direction is at right angle to edge and the cutting direction is parallel to edge are conducted. The parallel-specimens are superior to the right-angled-specimen at the average bending strength. Although at the specimens which indicate low strength the breakouts or cracks are observed at the workpiece-edge, there are improvement of the strength by chamfering the specimens. The propagation of the cracks formed at almost right angle to cutting direction on finished surface relates to the strength.
社団法人日本機械学会の論文
2000-11-25