Dynamic analysis of ball-screw with rotating nut driven
COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(4) 268-272
Department of Mechanical and Electrical Engineering, DeZhou University, DeZhou 253023, PR China
There is a certain degree difference between the static and operation condition for the high-speed Ball-screw with Rotating Nut. Therefore, this paper establishes a dynamic model of a preload-adjustable ball-screw with rotating nut by means of lumped-parameter and analyses the effects of changeable table position and work piece mass on the first three axial modes of the free vibration. A highspeed feeding system is modelled and its nature characteristics when the feeding system is in static, low and high rotate state. The results show that, at low speed state, the dynamics of the feeding system is the same as stationary state, and in high-speed conditions, the dynamics is quite different with the static state. The natural frequencies are notably changed with the position change of the table movement. The research lays an important theoretical foundation for developing this novel feed drive system.