Abstract:

Geometric error, thermal error and cutting force induced error account for 75% of total machine tool error, controlling these errors is the main way for improving the machine accuracy of CNC machine tools. Error compensation technology is used for reducing the volumetric errors of a two turntable five-axis CNC machine tool. In order to determine the displacement variables, temperature variables and cutting force variables required for volumetric error modeling, the main error sources of the two turntable five-axis machine tools will be analyzed, selected and optimized. According to the existing modeling methods, an optimized volumetric error model will be presented based on information fusion technology, and the influence of displacement variables, temperature variables and cutting force variables on volumetric error of the five-axis machine tool will be revealed. Finally, a volumetric error compensator will be designed for the experimental study of two turntable five-axis CNC machine tools, the compensation effect will be verified. The results show that prediction accuracy of the presented model is higher, the residual error is lower than 2 μm, and the maximum profile error is reduced from 15 μm to 5 μm after volumetric error compensation.

Key words: error compensation, information fusion, volumetric error modeling, five-axis machine tools