Active locating and clamping method and device for thin-walled workpiece with ultra-large radius-thickness ratio

The invention belongs to the technical field of machining of large parts, and discloses an active locating and clamping method and device for a thin-walled workpiece with an ultra-large radius-thickness ratio. Contour data of the outer surface of the thin-walled workpiece to be processed are collected in place, the characteristics of the outer surface contour of the thin-walled workpiece and the geometric center of the outer surface contour of the thin-walled workpiece are automatically represented through an optimization processing method, and the cutting machining center of the thin-walled workpiece on a numerical control machine tool is determined according to the geometric center. The radius-thickness ratio of the thin-walled piece exceeds 850, acute angles are formed between the inner and outer surface contours of the thin-walled piece and a plane of a perforated chassis, and before semi-finish machining and finish machining, machining allowance is reserved in a reference hole in the bottom of the perfor