A method for manufacturing aero-engine composite fan blade metal reinforcement edge

Abstract

The invention relates to a method for manufacturing a metal reinforcing edge of a composite fan blade of an aero-engine, which mainly includes the manufacturing process of performing diffusion connection to a prefabricated part through a sealing structure to obtain a hollow structure, and finally trimming and separating the metal reinforcing edge. And in the diffusion connection process, the core mold is used to support the cavity, which ensures the forming accuracy and quality of the inner cavity surface of the metal reinforcement edge. Compared with the prior art, the present invention solves the problems of low material utilization rate, difficult processing, and long production cycle caused by the overall cutting of the metal reinforcement edge, as well as the uneven thickness distribution and small inner cavity caused by the superplastic forming / diffusion bonding method The lack of high precision of fillet forming.

Description

Technical field [0001] The invention relates to a manufacturing method of a thin-walled deep cavity reinforced edge, in particular to a manufacturing method of a metal reinforced edge of an aeroengine composite fan blade. Background technique [0002] Fan blades are one of the most important parts of modern commercial aircraft engines, and their mass accounts for about 30% to 35% of the total mass of the engine. Reducing the quality of the fan section is a key means to reduce the quality of the engine and improve the efficiency of the engine. The use of composite fan blades is the only way to achieve a higher bypass ratio and weight reduction of the engine. Compared with titanium alloy hollow blades, composite fan blades have the advantages of light weight, high efficiency and low noise, and there are fewer composite blades, which have better anti-vibration performance, damage tolerance, and bird strike resistance. It can also meet airworthiness needs. However, the impact resis...

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Problems solved by technology

However, the impact resistance, compression resistance and lightning strike resistance of composite materials are worse than those of metal, especially at the leading edge of the blade, so the use of titanium alloy for edge wrapping is a commonly used method

[0003] The reinforced edge of the leading edge of the composite fan blade has the characteristics of complex, narrow, deep cavity, special-shaped and thin-walled, and the full-cut long-cycle processing method is adopted, and the material utilization rate is very low.

Due to the thin, narrow and deep wall of the cavity structure, it has high requirements on the cutting tool, the tool is prone to instability, the processing cycle is long, waste products are prone to occur, the processing cost is high, and it is not suitable for commercial application. Therefore, diffusion bonding and cutting processing are used. Combined manufacturing methods will be an inevitable trend of development

[0004] After searching the prior art, it was found that Chinese Patent Application No. 200510053532.2, published on July 27, 2005, discloses a method for manufacturing reinforcement components for the front or rear of fan blades, which involves processing by superplastic forming / diffusion bonding Non-hollow parts are processed by cutting two thick plates, diffusion bonding, superplastic forming and cutting. This process uses superplastic forming to form the inner cavity. However, the thickness will be significantly thinner during the forming process, and the thickness distribution will be different. Uniform, small fillet accuracy of superplastic forming can not meet the design requirements

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