Some investigators in recent years proposed analytical method with regard to the terriperature distribution at the tool-chip interface, an others also attempted to m easure there temperature distribution by the experimental method. But the former expressed unsymmetrical results aong the central section B-B, while in the case of orthogonal cutting the symmetrical temperature distribution muat be existed at the bothside of B-B section, latter indicated only the mean temper-ature at the tool-chip interface. Therefore the author derived some analytical formulas which based upon the theory of heat conduction at the semi-infinite body of stationary and moving heat sources and calculated tool-chip interface temperature by some experimental datas of orthogonal cutting in which the work and tool material were 0.26% C carbon steel and S_2 carbide too1.従来刃先温度の理論的解析に就いてはH. Blok. K. J.Trigger. B. T. chao. E. G. Loewen.M. C. Shaw. その他によって研究されているが各々その結果が異なり思わしい結果が得られない。又実験によっても温度分布を測定せんと試みた人にはSchwerd. 海老原その他の学者があるが正確なる論拠に之しいか，又は刃先の平均温度の測定に止まって正確なる温度分布を知ることは出来ない。筆者はJaegerやBlokの唱える停止熱源と移動熱源の理論より刃先温度分布の解析を試みると共に一方軟鋼の二次元切削を行って計算に必要な資料を求め刃先温度分布の状態を明かにした
