Research On Error Compensation In Machining Leading And Tailing Edge Of Titanium Hollow Blade

Titanium alloy hollow fan blade is one of the key parts of turbofan engine.Its machining quality has an important effect on aerodynamic performance and working stability of turbofan engine.The blades are formed by superplastic forming/diffusion bonding and milling process.The titanium alloy hollow blade belongs to a typical thin-walled and weakly rigid structure.It is difficult to control the machining deformation effectively in milling process of leading and tailing edge,which leads to low manufacturing accuracy and high waste rate.This paper set the goal to improve the machining accuracy of leading and tailing edge of titanium alloy hollow blade and carried out the research of milling error compensation technology.This paper solved the difficulty of blade milling deformation control.The main task is listed as follow:(1)Based on the technology of moving load and model change,the finite element prediction model for milling deformation of titanium alloy hollow blade is established,and the accuracy of finite element prediction model was verified by milling process.Based on the finite element prediction model,optimal selection of leading and tailing edge milling rough processing parameters was carried out.(2)Based on data of On Machine Measurement,an error compensation method is proposed,which is a combination of free form deformation and mirror compensation.This method establish the deviation relationship of actual shape and theoretical CAD model,and use iterative algorithm to adjust parts model.The calculated model meet the design requirements and applied the model reconstruction technology to generate final model.(3)The error compensation method was correct through the experiment of leading and tailing edge milling.The machining deformation of leading and tailing edge was effectively controlled.