水静圧スピンドルの温度変化の測定

抄録

Thermal stability of the ultra-precision machine tools is highly needed in order to improve the machining accuracy. In general, the spindle of the ultra-precision machine tools is supported by the hydrostatic bearings. Thus, the heat generation due to the viscosity of the lubricating fluid is inevitable. As a result, the temperature change of the spindle is taken place, resulting the spindle deformation. In this study, the power losses and the resultant heat generation of a spindle supported by water hydrostatic bearings is investigated. Furthermore, temperature increases of the spindle and lubricating water are measured. Then an influence of the temperature increase of water on the temperature increase of the spindle is investigated. The result shows that the power losses of the water hydrostatic bearings consume temperature increase of water, achieving minimum increase of the spindle temperature.