Aviation Blade NC Machining Deformation Analysis And Control Method

Aeroengine blades are the core components of the engine. However, the level of blade design and manufacturing has been a bottleneck restricting the engine performance. The blades are thin-walled parts that require high strength and light weight. Their freeform surfaces are prone to deform in their milling process. The shape and machining precision of the blades determine the performance of the engine. Research on blade machining methods can effectively improve blades machining precision and efficiency. At present, the blades are mostly processed by multi-axis CNC milling machines. Because the blades deform due to cutting force, how to predict and control the deformation of the blades is of important theoretical and practical value. In the paper, theoretical modeling, finite element analysis and cutting experiments are combined to optimize cutting parameters and control blade deformation.First, a blade milling force model is constructed. The deformation areas and influencing factors are analyzed. After determining the causes of blade milling deformation, error compensation measures are presented and a compensation scheme is determined. Then, a finite element analysis model for blade milling deformation predictions is constructed. Finite element analysis software ANSYS13.0is adopted to analyze the model. The constructed model is verified by actual milling experiments. And then, different cutting parameters are used to carry out finite element analyses. The blade deformation rules are summarized. Finally, according to the blade deformation compensation scheme, the rational milling parameters are selected. The results of finite element analyses and milling experiments verify the effectiveness of the compensation scheme. The scheme can effectively reduce blade milling deformation and improve blade milling precision.