Key Technologies Of Aviation Engine Blades Machining Based On Turn-Milling Center

The blade is the most central parts of the aircraft engine and it’s manufacturing is the key and one of the difficult points of the engine manufacturing which often known as "the heart in heart". The high-speed turn-milling machining technology is one of Advanced cutting technologies which is rapidly developed for adapting to the complexity of the product and the high-efficiency requirements of the production. The high-speed turn-milling machining technology is very suitable for the cutting of air difficult to machine materials. however, because of the blockade of the high-speed turn-milling machining technology using in aviation difficult to machine materials the technology by western countries, researchers lack of reference data which greatly restricted the study of high-speed milling technology in China. In this paper, the author according to the status of the processing technology in difficult to machine materials of the aero-engine blades, combined with the high-speed turn-milling machining technology,establishes milling force prediction model in order to accurately predict milling force.Analysis how the miling force impact on the workpiece and how to avoid three dimensional chatter.Provide theoretical guidance for the blade or other complex surface parts machined by high-speed turn-milling. The main research contents of the article are as follows:(1) After studied on the method of blade three-dimensional modeling,according to quintic polynomial theory,used matlab software to generate the type of blade cross-section line.finally,By UG software to generated the3D model of the blade. Through this part of the study it can be seen quintic polynomial method combine with the interface which can generate the blade profile can construct blades conveniently, fastly, accurately, etc.(2) Study on the processing technology of turn-milling machining blade, Illustrates the advantages of turn-milling machining technology aganst the shortcomings of the traditional processing methods. A CNC machining simulation of turn-milling machining blade is made based on UGCAM.And fanally using the UGCAM software generated the toolpath of the blade.(3) Though the analysis of the geometrical model of the ball end mill,combine the relationship between the blade and the tool when the blade is machining,according to the theory that tell the computer how to generate the tool path and finally use the method of firstly differential and then integral the cutting edge of the ball end mill to build the prediction model of milling force. The cutting force a few special points in the processing of the blade are simulated, which providing guidance for the actual processing.(4) According to the prediction model of milling force, the milling force of three special points are predicted in order to analysis the stress of the blade and the tool. Which proves that the tool that bears the milling force is safe. Study on the effect of milling force on thedeformation of the tool which may lead to the processing errors and finally gives the method to compensate the errors.At the end of the paper, the three-dimensional chatter is discussed,if you choes the rational spindle speed the three-dimensional chatter can be void.