横梁移动式五轴龙门铣床摆动轴与位置相关的几何误差检测与辨识

Position-dependent geometric error detection and identification of swing axis for beam mobile five-axis gantry milling machine tool

横梁移动式五轴龙门铣床是一种高速铣削,适用于大型、重型工件的双摆头五轴机床,其摆动轴作为机床传动链的最末端,直接与刀具相连。因此,摆动轴与位置相关的几何误差的检测与辨识对提高大型五轴机床的加工精度具有非常重要的意义。以XKAS2525×60型五轴龙门铣床为研究对象,利用多体系统运动学理论建立机床摆动轴(B轴)运动学模型,并基于球杆仪建立机床摆动轴几何误差辨识模型。最后,通过实验检测和辨识出了B轴6项与位置相关的几何误差,并对实验结果进行回归分析和对比分析,结果表明:所提出的机床摆动轴几何误差检测与辨识方法是可靠有效的,检测与辨识结果是正确的。

The beam mobile five-axis gantry milling machine tool is a kind of high-speed milling machine tool with double-swing head five-axis,which is suitable for large and heavy workpieces,as the end of the machine tool transmission chain,its swing axis is directly connected with the cutting tool.Therefore,the position-dependent geometric error detection and identification of swing axis is of great significance to improve the machining accuracy of the large five-axis machine tool.Took the XKAS2525×60 five-axis gantry milling machine tool as the research object,established the kinematic model of the machine tool swing axis(B axis)by using the multi-body system theory,and the geometric error identification model of machine tool swing axis is established based on the double ballbar.Finally,through the experiment,six position-dependent geometric errors of B-axis are detected and identified,and the experimental results were analyzed by regression and comparative.The results show that the proposed method for the geometric error detection and identification of machine tool swing axis is reliable and effective,the results of detection and identification are correct.