Study on Dynamic Characteristics of Oil Film of Hydrostatic Rotary Table Considering the Effect of Unbalance Load and Roughness

Abstract

The dynamic performance of the static pressure oil film is the key factor that affects the comprehensive performance of the hydrostatic rotary table, which is closely related to the surface quality and the load of the rotary table. First of all, the nonlinear capacity of the hydrostatic bearing pad and the preload thrust bearing is calculated by considering the surface roughness and centrifugal force. Then the dynamic model of the rotary table is established, and the thickness of oil film is calculated by Runge-Kutta method, and analyze the influence of unbalance loading on the dynamic characteristics of the rotary table. The results show that the deviation of the oil film thickness and the dynamic performance of the rotary table are reduced by unbalance loading; with the increase of the rotating speed, the oil film thickness decreases, and the oil film thickness fluctuates within a certain range, which is very small. The model and the conclusion of this paper will provide the theoretical support for the actual production and the service performance of the rotary table.