Method and device for extracting complex curved surface features of aero-engine case

The invention relates to the technical field of aero-engine case processing, and discloses an aero-engine case complex curved surface feature extraction method and device, and the method comprises the steps: recognizing the features of a to-be-processed region of a case three-dimensional model through three-dimensional model software, deleting the recognized features, and obtaining a remaining curved surface of the to-be-processed region of the case three-dimensional model; projecting the residual curved surface to a radial plane of the three-dimensional model of the cartridge receiver, selecting two points with the farthest distance in a projection area, taking a connecting line of the two points as a circle of which the diameter is located on the projection area, stretching the circle in the axial direction of the cartridge receiver to obtain a cylinder wrapping the residual curved surface, and performing Boolean subtraction on the cylinder and the residual curved surface to obtain a cylindrical surface wra