Numerical Calculation and Analysis of Dynamic Pressure Effect for Heavy Hydrostatic Bearing Disk with Multiple Oil Pads

Machining accuracy of heavy hydrostatic bearing disk with multiple oil pads has representativeness for overall CNC equipment, and dynamic pressure effect of heavy hydrostatic bearing disk directly affects its machining accuracy, therefore, aiming at dynamic pressure effect generated during the working. Based on FVM (finite volume method), numerical calculation for dynamic pressure filed of hydrostatic bearing disk is done under various cavity depth and under various rotating velocity on the condition of constant and variable viscosity, then the influence Law of dynamic pressure effect of various parameters is revealed. The results show that rotating velocity and cavity depth have strong influence on dynamic pressure effect, but influence Laws are different, and viscosity has less influence on dynamic pressure effect. The result of numerical calculation and analysis has important significance in improving machining accuracy and operation stability of heavy hydrostatic bearing disk with multiple oil pads.