Abstract:Taking a vertical machining center as the research carrier, a volumetric accuracy compensation technology was proposed. Based on the screw theory, on the basis of fully considering the spatial position of the machine cutting point, the volumetric accuracy model with all geometric errors was established for vertical machining center, and the volumetric accuracy display prediction model was output. Aiming at the limitation of traditional volumetric accuracy compensation, the idea of volumetric accuracy compensation was transformed into NC code optimization problem, the optimization problem was solved based on genetic algorithm, and the optimization results were verified through the experiment. The results show that the volumetric accuracy modeling of machine tool based on screw theory contains 21 geometric errors, and the volumetric accuracy prediction results are more accurate; the maximum compensation efficiency of machine tool volumetric positioning accuracy is 90.94% based on NC code optimization, by which the effectiveness of the proposed method is verified.