The Key Technology And Cooling Technology Research Of Aviation Engine Casing Processing

Aero-engine casing which has large load bearing is an important part of the aircraft engine. It has the complex processing, high manufacturing precision and bad workability as a typical thin-wall part. How to improve processing quality of the engine casing and reduce production costs become the key to competitiveness.The typical aero-engine casing hole is chosen for research object. A simplified cutting model is established by using metal forming simulation software DEFORM-3D. Combined with high-temperature alloy processing characteristics and processing characteristics of aero engine casing, referring to the manual metal cutting technology and the performance of the domestic machine tool parameter, the scope of cutting parameter optimization is determined.Three factors and three levels orthogonal experiment method is adopted, and the influence of cutting parameters on cutting force and cutting temperature are studied. By using minimum error sum of squares to look for the best match function of data, the empirical models of cutting force and cutting temperature are established, and the accuracy of which are verified by F-test. According to the models of cutting force and cutting temperature, with constraint function of surface quality and tool life, the highest productivity and lowest production cost as the objective function, improved genetic algorithm is adopted to complete the optimization of cutting parameters. Pareto space optimization solution set is obtained and machining process parameter database is built. The applications of intelligent database effectively solve the key technology of aviation engine casing, and provide theoretical guidance for the actual processing of the optimal cutting parameters selecting.The range of cutting parameters optimization is limited by cutting temperature in the machining of aero-engine casing. Reducing the cutting temperature can effectively expand the available range of cutting parameters, to maximize the performance advantages of the machine and to improve processing quality and cutting efficiency. According to the distribution of tool cutting heat, new type of cutting tool structure is designed, using the manner of liquid nitrogen cooling. The tool temperature would greatly reduce, and the quality of machining could improve in theory.