数控机床, 偏相关分析, 温度布点优化, 热误差建模

This paper presented a kind of NC machine tool thermal error measurement point optimization method based on partial correlation analysis. The thermal error modeling of NC machine tool commonly uses multiple linear regression method. In multiple linear regression modeling, because of the interaction among the independent variables, the relationship among the independent variables and the dependent variables are no longer perfect matched by the simple correlation coefficient. Here the partial correlation analysis was used to select optimal temperature variables, optimal layout of the temperature measuring point was achieved, and a multiple linear regression optimization model for NC machine tool thermal errors was established. The accuracy and robustness of the error modeling are improved.