Detection method for precise coupling piece of aero-engine

The invention discloses a method for detecting a precise coupling piece of an aero-engine, and the method comprises the steps: carrying out the automatic detection of the set measurement positions of a valve and a bushing through a three-coordinate measuring instrument, determining the circle center of each measurement position through the point cloud data of each measurement position, and determining the maximum radius and the minimum radius of each measurement position according to the circle center, according to the method, the taper and the roundness of the valve and the bush are further determined, meanwhile, the clearance of the same measurement position of the valve and the bush is determined through the point cloud data, the taper of the valve and the bush, the roundness of each measurement position and the fit clearance of the valve and the bush are detected in an all-around mode, the quality of a precise coupling piece is improved, and the precision of the valve and the bush is improved. Static and