Research On Process Of Manufacturing Deformation Control Of Titanium Alloy Thin-Walled Blades

As one of the important components of Made in China 2025,aerospace manufacturing industry has a broad prospect.Blade is key component of aerospace engine and widely used in centrifugal turbine disk,HP and LP compressor.The strict requests of design,manufacturing and assembly of the blade are put forward due to its many varieties,large quantities,complex structure and high precision.Meanwhile,the blade is often made of difficult-to-machining material with excellent material properties because of the poor working environment.All these bring big challenges to the manufacturing of titanium alloy thin-walled blades.The titanium alloy thin-walled blade is taken as the study object from the design,the process and the method of machining deformation control in order to improve machining accuracy by reducing the deformation during the milling process in this thesis.The main contents of this thesis are as follows:(1)Firstly,the three-dimensional model of titanium alloy thin-walled blade is completed based on studying the structure and design theory.Secondly,the CNC milling process is developed with the difficulty of machining process of the blade.Finally,the tool paths of each machining stage of the blade are planned,and it's not only simulated the front safety of the tool paths but also verified the safety of the NC files after post processing.In order to obtain the best tool paths,this section is focus on tool paths planning,5-axis parameters in blade finishing and multiaxis machining safety.(2)According to the theory of high-speed machining,the cutting force in the process is taken as the study object.On the one hand,the influence of cutting parameters on cutting force is studied by the orthogonal test during high-speed milling TC4 in the rough machining stage of the blade.On the other hand,the cutting parameters of high-speed milling TC4 are optimized by genetic algorithm with the minimum radial cutting force and the highest material removal rate,and the Pareto optimal parameter set under test conditions is given.(3)Firstly,the methods of controlling machining deformation of the titanium alloy thin-walled blades are studied,and the measuring plan of machining deformation of the titanium alloy thin-walled blades is developed.Secondly,the effectiveness of cutting force optimize mode based on VERICUT is verified through contrast experiment.Finally,the measuring result show that machining deformation of the blade is reduced by reducing cutting force fluctuation in the cutting process.In this thesis,the machining deformation control processes of titanium alloy thin-walled blades based on the technical difficulties in CNC milling are studied from the above main contents,which have solved the problems of difficult machining of titanium alloy materials and easy deformation of thin-walled surface parts by using the combined method of theory analysis and experiment verification.It has important value of the academic guide and the actual reference for engineering application.