Abstract
In this study, the evaluation method and compensation of thermal displacement about NC lathe are reported. Besides the heat generation from spindle, feed axis and so on, cutting heat is on of the major factors that influence thermal displacement. The majority of cutting heat is transferred to the coolant and raises the coolant temperature. Hence, replication of heavy cutting condition using pipe heater is proposed. Using the proposed method, thermal displacements of each components of NC lathe were measured and displacement of bed and turret were found to be dominant. Thermal compensation was also conducted to reduce thermal displacement by cutting heat. The stability of compensation was experimentally verified with various cutting heat and the change of ambient temperature.
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