Research on in-Situ Size Measurement Method of Filament Winding Workpiece

The geometric dimension accuracy of filament wound composite workpiece is the key factor to determine its performance. Aiming at the problems of low efficiency of traditional detection methods and difficulty in taking into account the measurement range and accuracy of a single sensor measurement scheme, this paper proposes a high-precision in-situ size measurement method based on the fusion of depth camera and laser displacement sensor. Firstly, the Intel RealSense D435 depth camera is used to quickly scan the machine tool shaft and the workpiece clamped on the machine tool shaft to obtain the initial point cloud model. Then, through principal component analysis (PCA) and point cloud symmetry analysis algorithm, the workpiece is intelligently judged whether it is a rotary structure. If it is determined to be a rotary body, the BLG-250 N-485 laser sensor of BOE is controlled to perform precise scanning along the direction of the workpiece rotation axis. By synchronously collecting the laser ranging value and the sensor displacement, the workpiece contour point cloud with sub-millimeter accuracy is reconstructed. The experimental results show that this method can effectively identify the type of workpiece and realize high-precision size parameter refinement of the rotary workpiece. Compared with the single visual reconstruction method, the size measurement accuracy is improved to 0.01 mm level, which provides an effective technical solution for the in-size measurement of filament-wound products.