Research on the grinding rounding mechanism and law of the cylindrical grinding system supported all by hydrostatic spindles

Abstract

The maximum achievable journal roundness accuracy range by the conventional “Rolling bearing supported spindle and fixed center clamping” grinding solution is about 0.2–0.5 μm, which barricades the grinding roundness improvement. To further improve the grinding roundness, this study proposes a novel “Fully hydrostatic supported spindle and movable center clamping” grinding solution, which adopts hydrostatic supported grinding wheel spindle, and hydrostatic supported movable clamping centers. Firstly, based on the interaction between wheel and workpiece, a coupling material removal deformation compatibility model is built, and the rounding process of external cylindrical grinding is quantitatively simulated. Secondly, a fully hydrostatic supported grinding system is developed and tested. The optimal roundness error in the experiment reached 0.12 μm, the maximum relative error between the simulated results and the measured average results is 18.5 %, which validates the proposed solution and the algorithm. Thirdly, from the perspective of grinding parameters, the grinding rounding law of the system is studied. Finally, the proposed grinding solution is compared with the conventional grinding solution, the novel grinding solution has better grinding efficiency and grinding roundness. The proposed grinding solution may provide a new path for grinding accuracy improvement.