对于高光表面及小圆角结构工件, 传统的光学测量方法以及设备难以满足工程要求, 基于蓝光扫描仪, 提出一种球心偏置测量方法。在待测工件表面附着经220目砂粒喷砂处理的钢球, 利用蓝光扫描仪对钢球进行快速扫描并拟合出扫描点云的球心点, 沿待测工件表面法矢方向偏置钢球半径可得到工件表面实测点。利用该方法对标准圆棒进行测量, 拟合直径差值为0.000 2 mm, 测量精度在0.03 mm以内, 验证了该方法原理的可行性。以进排气边圆角R<0.1 mm的抛光叶片某条截面线为例, 测量精度在0.03 mm以内。该方法不受待测工件表面材质影响, 对于高反光表面以及具有微小结构特征工件的测量具有重要意义。

For high reflective surface and small fillet structural workpiece, traditional optical measurement methods and equipment are difficult to meet engineering requirements. A spherical center offset measurement method was proposed based on the blue light scanner.We made sand-treated steel balls adhere to the workpiece and scanned the steel balls by using blue light scanner.Then we fitted the sphere center of the point cloud and offset the sphere radius along the normal direction of the workpiece surface to obtain the actual workpiece point.The standard cylinders fitting-diameter-deviation is 0.000 2 mm and the measurement accuracy is less than 0.03 mm by using the method. The result proves the feasibility of the method.Taking a section of polishing blade which fillet radius of inlet and exhaust edge is less than 0.1 mm as an example, the measurement accuracy is within 0.03 mm.This method is not affected by the workpiece material and it has great significance for the measurement of the workpiece which has high reflective surface and small fillet feature.