基于虚拟光笔的坐标测量系统探针结构的设计

Design of Probe Structure in CMM System Based on Virtual Light-pen

针对光笔式测量系统模型的特征,基于虚拟光笔,建立了一种新的光笔结构。系统中采用的光笔共有10个控制点,设光笔前面6个控制点所在的平面与后面4个控制点所在的平面之间的距离为D_(FB)。利用三坐标测量机主轴运动的高精度、高稳定性,构造了不同D_(FB)的虚拟光笔。详细说明了虚拟光笔的构造模型,并通过实验证明了DFB参数对系统测量稳定性有着显著的影响,且D_(FB)的最优值为80mm,通过精度对比实验进一步证明了该结论。

Based on the virtual light-pen, a new type of light-pen structure was built by analyses of the system model＇s feature. The light-pen adopted in the system had ten control points, and supposed the distance between the front plane where six control points laid and the back plane where other four ones did as DFB. The CMM＇s main axis could move with high accuracy and stability, then virtual light-pens with different values of DFB were built. The structure model for the virtual light-pen was given in detail. And several experimental results prove that the parameter DFB remarkably affects the stability of the whole system with that DFB＇s optimal value is as 80 mm.