旋削における硬質工具の摩耗および仕上面粗さに及ぼす切削油基油の性状の影響

概要

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A series of cutting tests was perfomed to investigate the effects of the viscosity grade and the molecular weight distribution of base oil for cutting oil on wear of hard cutting tools (cemented carbide, cermet and ceramic) and finished surface roughness generated in turning. The results obtained are summarized as follows. With a cemented carbide tool, boundary wear on the side flank decreased with increase of the viscosity grade of base oil, while front flank boundary wear was negligibly affected by the viscosity grade. The side flank wear was little influenced by the application of base oils. With cermet and ceramic tools, adhesive matter appeared around the area where the side flank boundary wear occurs with the cemented carbide or high-speed steel tool, and this did not allow confirmation of the occurrence of side flank boundary wear. With both tools, front flank boundary wear showed a tendency to decrease with higher viscosity grades, while side flank wear was little affected by the application of base oils. The minimum finished surface roughness was obtained using a base oil of medium viscosity grade. Oils with a wide range molecular weight distribution were superior to those with narrow range distributions in reducing wear of the cemented carbide tool, especially side flank boundary wear, and also in improving the finished surface roughness.
1996-01-25