旋削加工工具寿命に及ぼす鋼中のイオウならびにリンの影響

抄録

In order to clarify the effects of sulphur and phosphorus contents in steel on the tool life, a joint experiment program was planned and performed under the supervision of the technical committee on machinability in J. S. P. E.
The experimental design methods were used to plan the experiments and the data collected were statistically analyzed for searching optimum tool life models with three independent variables, i.e., the sulphur and phosphorus contents and cutting speed. The following conclusions were obtained from the analyses;
(1) The tool life models accepted by the statistical analysis were T=exp [b₀+b₂(100 P)]× (100 S)^b₁ V^b₃ for the tool life evaluated by the crater wear and T =exp[b₀+b₁ (100S) +b₂(100P) ]V^b₃ as a first order approximation for the tool life evaluated by the flank wear.
(2) The effect of the sulphur content on the tool life varies with the combination of the work material, tool material and the wear adopted as the criterion, while the tool life decreases with the increase in the phosphorus content.
(3) The tool life data showed statistically significant variation by the locations where experiments were made.