三坐标测量机测头半径补偿的新方法

A New Method of the CMM Probe Radius Compensation

用三坐标测量机进行测量时,需要对测头半径进行补偿。在对现有的测头半径补偿方法进行分析的基础上,提出一种“四点共球法”,实现了对测头半径的补偿。在阐述四点共球法原理的同时,给出了它的运算量和采集数据点的方法。然后,对该方法的补偿精度做了初步分析,并给出保证补偿精度的注意事项及进一步提高补偿精度的方法,以一个补偿实例进行验证,结果表明四点共球法可以满足绝大多数工程测量,具有一定的实际应用价值。

The probe radius compensated is necessary when we measure by the CMM. Based on analyses the existing methods of the probe radius compensation, a new algorithm named ＂4-point build a sphere＂ is proposed. The theory of the algorithm is expounded, at the same time, the way of gathering data and its operation speed are offered. And then, the precision of the algorithm is analyzed by computer simulation and how to improve the precision is introduced farther. And it＇s showed that the algorithm can satisfy a majority of measure and has application value. Finally, the algorithm is verified by an instance again.