Development and analysis of a new hydrodynamic spindle support to improve manufacturing performance of precision grinding machines.

摘要

Today manufacturing requires greater speed and accuracy in order to remain competitive. The heart of a machine tool is the spindle, and the better the bearings, the better quality of spindle. The objective of this dissertation is to develop design and computational analysis for a new hydrodynamic support of the high-stiffness and high-speed spindle used in precision grinding machines. An overview of the mechanism of centerless grinding operation is provided.; A concept of force determination is presented and compared with the machine load with field data measurements. A novel, four pad, tilting pad journal bearing has been developed and numerically analyzed. In this design, the journal rotates about the bearing pads, which are mounted on a stationary shaft, and one pad is hydraulically actuated. The detailed rotordynamic analysis is developed for the new-designed spindle-bearing system.; Finally, a new on-line spindle stiffness support regulation strategy is presented to control grinding chatter vibrations.