Study on the Performance of Interference Fit for the High Speed Spindle

The high speed spindle is the key unit of the high speed cutting, while he interference fit between the spindle and the motor rotor is one of the most important factors influencing the geometrical accuracy, the kinematical accuracy and the machining accuracy of the spindle. The performance of the interference fit is not only subject to the initial assembly tolerance, but also the centrifugal force oriented deformation. With the increasing of the rotating speed, the influence of the centrifugal force is bigger and bigger. It's essential to consider the contact pressure, moment and rotating speed, when designing the interference fit. In this paper, the static an dynamic formulas are derived for calculating the interference fit and contact pressure. These formulas contribute to design the interference fit for the high speed spindle, improve the kinematical performance and the machining performance of the spindle.