High speed machining is the core technology that influences the performance of machine tools, and the high speed motor spindle is widely used for the high speed machine tools recently. The important problem in the motorized spindle is to reduce and mi...
High speed machining is the core technology that influences the performance of machine tools, and the high speed motor spindle is widely used for the high speed machine tools recently. The important problem in the motorized spindle is to reduce and minimize the thermal effect by the motor and ball bearings when the spindle is operated. Thermal characteristics according to the bearing preload and cooling condition is studied for the spindle with the oil mist lubrication and high frequency motor.
In this study, the temperature distributions, the thermal displacements and the trend of stiffness changes according to the inner heat generation are measured for optimal bearing preload and cooling flow rate to minimize the thermal deformation of the spindle. To predict the thermal characteristics of the spindle system, the temperature distributions and the thermal deformations are analyzed by using the finite element method and transient heat transfer analysis. This result can be applied to the design and manufacture of the high frequency spindle for optimal bearing preload and cooling flow rate.