Method for repairing blades at cold and hot ends of aero-engine

The invention discloses a method for repairing blades at the cold and hot ends of an aero-engine. The method comprises the following steps: (1), carrying out 3D scanning on blades; (2), carrying out reverse modeling; (3), optimizing the structure; (4), carrying out simulation analysis; and (5), carrying out 3D manufacturing; according to the technology, the modern mature three-dimensional scanning technology is utilized, reverse modeling is carried out, the original structural shape is reconstructed and restored, and meanwhile the repairing effect is achieved; the internal optimization design is carried out on the blade by utilizing the four-necklace basic principle and the innovative means design, and the internal innovative design can improve the performance and the service life of the blade while the weight of the blade is reduced; and finally, batch production is conducted through the advanced 3D additive manufacturing technology. The cost of blade parts reduced through the technology is far lower than th