BN添加鋼の被削性(第2報) : 快削効果に及ぼす被削材および工具中の化学成分

概要

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This paper deals with influence of chemical compositions of work materials and cutting tools on machinability of BN added steels. In this study, work materials including different levels of Al, B and N were turned with carbide and cermet tools which also included different levels of Ti at high speeds. Furthermore, the free-machining mechanisms were discussed on the results obtained from cutting tests. Machining tests showed that BN added steel including Al had very good machinability when they were machined with P-grade carbide tools. The machinability, however, decreased when the work material had low content of Al, B or N. Up to 0.06% of Al in work material, it showed that the larger amount of Al the bigger effect of machinability Thb machinabiiity of BN added steel was influenced by Ti content of cutting tool, that is, the higher content of Ti the smaller tool wear. When machining BN added steels at high cutting speed with P-grade carbide tools, Al and N were detected as a layer, and the layer was considered as AlN by X-ray diffraction analysis. AlN layer on the carbide tool surfacb prevented the inter-diffusion between cutting tool and work material. The effect of AlN on the diffusion was considered as the mechanisms of free-machining of BN added steels.
公益社団法人精密工学会の論文
2000-02-05