五轴联动龙门铣床误差分析与检测辨识研究

Research on errors analysis and detection and identification of five-axis linkage gantry milling machine

对某五轴联动龙门铣床进行几何误差分析,并结合机床拓扑结构和多体系统理论的理想的位置、运动矩阵、位置、运动误差矩阵,利用激光干涉仪进行机床仅沿三坐标轴方向运动的误差检测,辨识滚角误差;平动轴的各项几何误差经补偿后,使用雷尼绍球杆仪分别与三坐标轴的方向平行,进行C回转轴误差检测,再使得球杆仪安装沿Y轴有一偏移量,进行B轴的误差检测,辨识线位移误差和角位移误差。最终,得到五轴联动龙门铣床的37项几何误差参数,为后续的误差补偿奠定基础。

Analyze the geometric errors of a five-axis linkage gantry milling machine,and combine the ideal position matrix and ideal motion matrix,position error matrix and motion error matrix of the machine tool topology and multi-body system theory.The laser interferometer is used to move the machine tool only along the three coordinate axes.Errors detection and identification of the roll angle errors;After compensation for the various geometric errors of the translational axis,use the Renishaw ballbar to be parallel to the direction of the three-coordinate axis to perform the C-rotation axis errors detection;when installing the ballbar,there is an offset along the Y axis,and the errors detection of the B axis is performed to identify the linear displacement errors and the angular displacement errors.Finally,37 geometric error parameters of the five-axis linkage gantry milling machine are obtained,which lays the foundation for subsequent error compensation.