Abstract
A novel diaphragm-control restrictor (DCR) is proposed for improving the performance of the hydrostatic-bearing spindle used in the precision grinding machine. Unique functions of the proposed DCR is its adjustability for the restrictor characteristic. By changing the restrictor resistance of the DCR, the effect of the active control can be altered. The proposed DCR is incorporated into hydrostatic radial bearings of the work spindle of the precision grinding machine, then the static and dynamic performances of the spindle are analyzed. The results of the analyses show that the static stiffness of the spindle can be incresed to be infinite, and the dynamic compliance shows that the effect of the active control can be observed up to 20Hz. These results show that the proposed DCR is useful for improving the performance of the hydrostatic-bearing spindle in the precision applications.
