Abstract
The present paper reports the study on the machined shapes of metals whose thermal constants are clarified only in room temperature. The calculation is carried out under the following conditions. (1) In the solid phase, the thermal conductivities λ and the thermal diffusivities χ in room temperature are used; (2) In the liquid phase of pure metals, the half values of λ and χ at room temperature are used; and (3) In the liquid phase of alloys, the double values of λ and χ at room temperature are used. The results are summarized as follows;
(1) In the area of drilling without residual melt of metals whose thermal conductivities are less than about 0.4J/cm·s·deg, the calculation precisions are within 10% of the experimental values. Even though machining of metals whose thermal conductivities are more than0.4J/cm·s·deg and machining in area including residual melt, sufficient precision is obtained by introducing the temperature-dependencies of thermal constants. (2) Actual machining processes are simulated by the calculating method shown in this paper. (3) Diameters calculated at the surface of workpieces are in good agreement with those obtained by experiments in the region of removal machining independently of thermal constants. (4) Machining conditions are decidedeasily by thecomputer simulation described above.
