Cooperative machining method for large sandwich component

The invention discloses a cooperative machining method for a large sandwich component. The method comprises the following steps of: performing scanning measurement on an actual cooperative curved surface of a face plate skin by utilizing a handheld self-positioning three-dimensional laser scanner to obtain data point clouds of the actual cooperative curved surface of the face plate skin; removingimpurity points and noise points from the point clouds, optimizing point cloud number, and performing wrapping operation on the data point clouds to generate a polygonal curved surface; performing operation such as repairing, correcting and the like on the polygonal curved surface, and establishing a grid and a curved surface by detecting curvature and an outline so as to obtain an actual cooperative curved surface computer aided design (CAD) model of the face plate skin; performing numerical control programming on the actual cooperative curved surface CAD model by utilizing CAD/computer aided manufacturing (CAM) soft