快速探测三坐标测量机特性参数优化研究

Research on Characteristic Parameter Optimization of Fast Probing CMM

研究了影响快速探测坐标测量机动态测量精度的特性参数与测量精度之间的关系。通过实验分析了移动速度和测量位置对测量机定位误差的影响,以及测头DDC参数对测头等效作用直径的影响。研究结果表明:测量机的动态测量误差重复性好并可以修正;由于不同移动速度下,气浮导轨刚度和不同驱动电机加速度曲线引起的桥架附加振动不同,因此不同结构测量机存在不同最佳临界移动速度;测量机沿不同方向触测时,存在与移动速度有关的不同最佳测量空间;逼近距离对测头等效作用直径d的影响远远大于触测速度和移动速度对d的影响。

The complex relationship between the natural parameters of the fast probing CMM and the dynamic precision was investigated. The influences among the CMM positioning error and the measuring velocity and position and the influences between the probe DDC parameters and the equivalent action radius were analyzed through the experiments. From the experimental analysis it can be concluded that the dynamic measuring error of the fast probing CMM has good repeatability and can be corrected. There exists the optimum critical measuring velocity due to the different additive vibration of the CMM bridge which is caused by the air bearing stiffness change and the different driving acceleration while the CMM measuring velocity is different. The velocity of the CMM having different structures is different. There exists the optimum measuring space related to the measuring velocity while the CMM probes on the different directions. The approaching distance has made much more contribution to the equivalent action radius change than that from the probing and moving velocity of the probe.