切削温度上昇を伴う断続切削時の切れ刃欠損発生の解析的予測(第2報) : 断続切削回数による切れ刃欠損確率の推移

概要

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Transient variation of impact and thermal stress fields, and temperature distribution as well, within cutting edge during the edge engagement in interrupted turning were first obtained through FEM calculation using measured variation of impact cutting force and temperature on rake face. The probabilistic stress criterion of brittle fracture and its variation due to repetition of impact stress for each location within the tool edge using the deterioration rule reported in previous paper were next obtained. In collation of the most dangerous state of the transient stress with the fracture criterion at each element, variation of fracture probability distribution within the cutting edge with number of the interruption was predicted. Thermal stress had the effect to decrease the failure probability, while temperature rise did promote the probability. The predicted relation for edge failure occurrence shows good agreement with experimental results. It is also possible in practical manner to predict the edge failure for the tool with rounded or chamfered edge by applying a suitable flank force to the edge.
1988-06-05