关键词: 变截面涡旋盘, 薄壁, 正交试验, 精密铣削, 回归预测模型, 灰色关联度分析

Abstract: In order to determine the optimal machining parameters of thin-wall complex variable cross-section scroll precision milling process and reveal the effects of milling combined parameters on milling forces, a method was proposed to optimize milling combined parameters and predict milling forces accurately for variable cross-section scrolls based on multiple regression analysis and grey correlation method. Firstly, the geometric model and precision milling model of variable cross-section scrolls were established, and the orthogonal test method was used to analyze the influences of milling parameters on milling force components. Secondly, the prediction model of milling forces was obtained based on multiple regression method, and the significance test analysis was carried out on the regression equation. Then, the close correlation degree among milling parameters and milling forces were explored by grey correlation method. Finally, the milling force prediction model was verified by milling experiments and the optimal milling parameters were obtained. The results show that the maximum, minimum and average relative errors between the predicted milling forces and the experimental force are as 9.02%, 3.31% and 6.16% respectively, which verifies the reliability and accuracy of the model and provides a basis for machining high-precision variable section scroll parts.

Key words: variable cross-section scroll, thin-wall, orthogonal test, precision milling, regression prediction model, grey correlation analysis