難削材のプラズマ加熱切削(第3報) : ガラスとエンジニアリングセラミックスへの適用

概要

論文の詳細を見る
A hot machining technique using plasma jet heating has been employed to improve the machinability of glasses and engineering ceramics such as Pyrex, mullite, alumina, zirconia and silicon nitride. Plasma heating is aimed not only at reducing the hardness of ceramics but also at changing the chip formation from discontinuous to continuous. The turning forces markedly decreased as the workpiece was heated to temperatures above 1050 ℃ in the case of silicon nitride. Increased heating temperature changed the segmented chips produced in ordinary cutting into continuous ones, accompanied by a better finished surface with less defects. Tool wear was also decreased by means of hot machining : e.g. by a factor of 8 in turning silicon nitride with a diamond tool. However, the application to alumina and zirconia did not show sufficient improvements in machinability
公益社団法人精密工学会の論文
1989-06-05