2019 年 85 巻 869 号 p. 18-00284
The equation, which expresses the influence of cutting conditions such as cutting speed, depth of cut and feed rate on the cutting temperature of the workpiece, is investigated by the dimensional analysis. In this analysis, thermodynamical basic dimension system is used. The equation derived consists of the factors of cutting speed, depth of cut, feed rate, specific cutting energy, and volumetric specific heat and thermal conductivity of the workpiece material, and the equation is compared with those which were derived by the other researchers. The experiments are carried out by turning under the various cutting conditions, and the results obtained are compared with the analytical results. The cutting temperature is measured by the two-color pyrometer with an optical fiber which is developed by the author. Ti-6Al-4V, S50C, Inconel718, SUS304 and Aluminum are used as the workpiece materials and Al2O3 tool is used as a cutting tool. The analytical equation makes it possible to estimate the cutting speed under which the cutting temperature reaches the melting point of the workpiece material. The specific cutting energy which is necessary for making a chip of unit volume is estimated using the volumetric specific heat and the melting point of a workpiece material. In other words, the energy used for cutting is equal to the energy used for melting the work material.
