Research On Machining Deformation Control Technology Of Air Blade Based On Error Compensation

To a large extent,the performance of aero-engines depends on the manufacturing precision and quality of the blades.As the core component of the aero engine,the blade is easy to produce serious machining deformation during the machining process due to its complex shape,thin wall and large torsion angle.Therefore,it is difficult to manufacture.Aero-engine blade manufacturing is known as “The pearl of the modern industrial crown”.In order to improve the overall level of China's aero-engines and narrow the gap between China and the West,improving blade processing and manufacturing technology is imminent.In this paper,the blade processing manufacturing technology,especially the machining deformation control technology,is deeply analyzed,focusing on the elastic deformation of the blade caused by the milling force and the deformation caused by the initial residual stress release and make error compensation.The main research contents include:1.Based on the theory of material mechanics,the causes of the two deformations are analyzed separately.By establishing a cantilever beam to simplify the model structure of the blade,the correlation formula between blade size and deformation is derived.The process of releasing the residual stress is equivalent to the elastic deformation process,and the residual stress is equivalent to the external force acting on the part according to the elastic theory.2.Based on the bevel cutting theory,the three-axis milling force model of the ball-end cutter is established.The three-dimensional model of the cutter is used to solve the milling micro-element width and the instantaneous milling thickness.Based on the experiment,the milling force coefficient is calibrated by using average force method and t least squares method.3.Establish a simplified model of the blade considering the milling force,and propose a machining deformation error compensation method based on the inverse deformation principle.The comparing experiment is conducted on the simplified model by a single error compensation,and the deformation of the pre-compensation and compensated simplified model are obtained by measurement to verify the accuracy of the method.4.Based on the online measurement,find out the blade deformation law caused by the initial residual stress release,and control the blade deformation by adjusting the machining coordinate system and multiple error compensation methods respectively.