In the traditional large scale surface coordinate measurement method,there are some problems,for example, there is a large deviation between measured workpiece and measurement system when unifying coordinate system;mea-sured workpiece is prone to move during the measurement and deep hole positioning point could not be accurately mea-sured. So a coordinate measuring system was designed for large scale complex curved surface. The structure of hand-held frame and probe was designed;and the measurement system was established by using a robot and a set of iGPS positioning system. Then,the probe was compensated by the micro-plane method. Automatic measurement and dynamic measurement of feature points can be realized simultaneously. The results showed that the error of using mi-cro-plane method for probe compensation does not exceed ±0.2mm;the accuracy of deep hole positioning point mea-surement is about ± 0.2mm and the 3D point uncertainty is 0.279mm. The measurement system can realize dynamic tracking measurement for large scale complex curved surface and is suitable for deep hole features measurement.%针对传统大尺寸复杂曲面特征点坐标测量过程中存在的被测工件与测量系统进行坐标系统一时会存在较大偏差、被测工件在测量过程中易产生移动和深孔中心位置点无法准确测量等问题,设计了一种用于大尺寸复杂曲面特征点的坐标测量系统.首先,对手持框架和探针的结构进行了设计,使用iGPS定位系统和工业机器人搭建了测量系统.然后,采用微平面法对探针测头进行了补偿.测量系统可同时实现对大尺寸曲面上特征点三维坐标的自动化测量和动态测量.实验结果表明:采用微平面法的测头补偿误差不超过±0.2mm,深孔中心位置点的测量精度在±0.2mm左右,测量系统不确定度为0.279mm.测量系统可实现大型复杂曲面坐标的动态跟踪测量,且适用于带有深孔特征的曲面测量.
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