The high-precision CNC machine tools have been widely used in the market. To maintain the po-sitioning accuracy in three-dimensional space, it is necessary to measure volumetric errors of machine tools. Based on the conventional laser step body diagonal measurement, a simplified error identification method is recommended . The simplified method could achieve the same results with conventional method with measur-ing only 3diagonal lines. The time of measurement is saved. An optimized method is proposed according to the research on installation errors of laser step body diagonal measurement. After measuring positioning er-rors of 3diagonals and 3 translational axes, the installation errors could be removed. With the optimized method, laser step body diagonal measurement becomes more accurate, while the efficiency is still main-tained. A measuring experiment for volumetric errors was conducted on a three-axis machine tool. The sim-plified and optimized methods which are proposed in this paper are validated by the experimental results.%高精度数控机床已经在市场中广泛应用.为了保证机床在三维空间中的定位精度,需要对机床的体积误差进行测量.文章在传统的激光分步体对角线测量法的基础上,提出了一种简化的辨识方法,通过3条机床工作空间体对角线定位误差的测量数据,即可辨识获得与传统方法(测量4条体对角线)相同的结果,减少了测量时间.针对分步体对角线测量的安装误差,提出了一种优化的测量辨识方法,通过增加3个平动轴定位误差的测量,可以去除安装误差对测量结果的影响,提高了测量辨识精度,同时也不失高效性.运用上述测量方法在机床上实施体积误差测量实验,实验结果证实了文中提出的激光分步体对角线测量的简化方法和优化方法的有效性.
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