Hydrostatic NSK bearing has high rotation accuracy, good rigidity, high bearing capacity, no wear and high durability.
The stiffness of the thin film feedback throttle hydrostatic NSK Bearings is very large, but the phenomena of pad holding, roughening and pressure drop often occur in the operation of machine tools. The key of film feedback is film. In practice, it is believed that the main reasons for bearing bush locking and galling are: ① plastic deformation of film; ② Feedback is slow. When the external load changes abruptly and the film has not reacted, the shaft and the pad have rubbed; ③ Film fatigue. The film has long service time and fatigue deformation, which is equivalent to changing the feedback hydrostatic NSK Bearings parameters.
Good results can be achieved by increasing the thickness of the film and using some fatigue resistant materials. Generally, rigid membrane, preloading and reserved gap are used. The specific method is: change the 1.4mm thick film into a 4mm thick rigid film, pad the lower cavity with 0.05mm thick tin foil paper, and adjust the spindle to a position 0.05mm higher than the ideal position. The purpose is to return to the ideal center just after the spindle is stressed (grinding wheel weight, cutting force) hydrostatic NSK Bearings.
In the oil supply system of hydrostatic NSK bearing, except for coarse filtration and fine filtration, other components have a protective effect on hydrostatic bearing. The oil supply system is improved on the basis of the original system.