Method for manufacturing covered edge of fan blade

Abstract

Aiming at a composite material fan blade, the invention provides a method for manufacturing the covered edge of the fan blade. The method comprises the following steps that for a theoretical model based on the covered edge, an edge covering three-dimensional model which is matched with the fan blade and is provided with a uniform machining allowance is designed; a 3D printing technology is adoptedto print the edge covering three-dimensional model to form an edge covering base body; annealing heat treatment is carried out on the printed edge covering base body, so that residual stress inside the edge covering base body is reduced or eliminated; electrolytic machining is conducted on the inner surface of the edge covering base body, so that the machining allowance of the inner surface of the edge covering base body is removed; and vibration finishing is carried out on the outer surface of the edge covering base body, so that the surface smoothness is improved, and a compressive stress layer is formed. The method aims to fully utilize the 3D printing technology to achieve the following advantages that the material utilization rate is high, the surface quality of an electrolytic machining part is good, the residual stress and deformation are small, the surface quality of a part machined through vibration finishing is good, and the anti-fatigue strength can be improved to a certaindegree; and near-no-allowance machining of edge covering is realized, the material utilization rate and the machining precision are improved, and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of fan blade processing, in particular to a method for manufacturing fan blade wrapping. Background technique [0002] Compared with titanium alloy fan blades, composite material fan blades have the advantages of high weight reduction efficiency, low fuel consumption, and good vibration resistance, but they also have disadvantages such as poor bird strike resistance and easy delamination and cracking. In the civil high bypass ratio turbofan engines already in service, such as GE90 and GEnx, the method of bonding titanium alloy wrapping on the leading edge of the blade is mainly used to improve the anti-strike ability of the leading edge. [0003] Due to the requirements of aerodynamic design, fan blades generally have a sweeping structure with curved space, so the leading edge wrapping is usually a thin-walled complex three-dimensional curved surface structure with large size, poor rigidity, and high surface...

AI Technical Summary

Problems solved by technology

[0007] At present, titanium alloy edge wrapping at the leading edge of composite material blades is generally manufactured through forgings / thick plate CNC processing, and the material utilization rate is less than 10%; the requirements for forging, numerical control and other equipment and tooling molds are high, and the processing efficiency is low; and because the edge wrapping It is a thin-walled and complex curved surface structure with poor rigidity, large machining deformation, and low machining accuracy, which affects the aerodynamic efficiency of the blade; the residual stress generated by cutting is large, which affects the performance of the wrapping; the surface quality is not high, and usually requires subsequent polishing treatment

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