309 金属間化合物の加工法が機械的性質に及ぼす影響(機械加工)

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This paper deals with the defects of surface and the breakouts at the edge of workpiece in machining of titanium aluminide intermetallic compounds. Furthermore, the relationships between the mechanical strength and the machining methods are 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. Fourpoint bending tests in two types of specimen whose edge and cutting direction are varied are prepared. The parallel-specimens are superior to the right-angled-specimen at the average bending strength. Although at the specimens, which indicate low strength, the breakout or cracks are observed at the workpiece-edge, there are improvements of the strength by chamfering the specimens. From the size of surface and edge defects, the strengths of polishing-specimen are superior to cutting-specimen, but these of wire-electrical-discharging-specimen are inferior.
社団法人日本機械学会の論文
2000-06-23