旋削加工においてBN添加鋼を被削材とすることで普通鋼と比べて大幅に長い工具寿命を得ることが出来た. 特にTiC添加アルミナセラミックが優れた切削性能を示し工具寿命基準を逃げ面摩耗が0.3mmとしたときおよそ10時間の工具寿命を得ることが出来た.正面フライス切削においてもTiC添加アルミナセラミック工具を用いれば,切込みを小さく抑えて加工すればある程度の時間,加工の継続が可能であることが分かった.
The tool lives in turning of BN free-machining steel were obvious longer than those of standard steel. In particular, the tool life of TiC added alumina ceramic tool reached about 10 hours in the case that the tool life criteria was set at VB=0.3mm. This tool life was twice as long as that of coated carbide tool. In intermittent cutting, when depth of cut was set at relatively small, TiC added alumina ceramic tool was able to be used.