分析了三坐标测量机测头半径对测量数据的影响,对由三坐标测量机在复杂曲面上测得的点,每一截面的测量点用大挠度三次样条连接,而各截面间采用基样条函数连接,组成基样条函数和大挠度三次样条曲线的混合曲面,在此基础上推导出测量点所形成的曲面及其法向等距面的数学模型,从而消除测头半径的影响。 The influence of CMM probe radius on the measurement data was analyzed. For the points measured by CMM on complex curved surfaces, the measurement points of each section were connected with large deflection cubic spline, The spline function is connected to form a mixed surface with a base-spline function and a large deflected cubic spline curve. Based on this, a mathematical model of the surface formed by the measuring points and its normal isometric surface is deduced to eliminate the radius of the probe influences.