Abstract:

The process factor and measure effects on age forming properties of aluminium alloy integral wing skin panels are analyzed,such as one-step aging,two/multi-step aging,vibratory stress relief method and stress-orienting effect.The following conclusions are drawn: two/multi-step aging should be adapted to improve the general performance of the wing panel;vibratory stress relief method should be taken to accelerate the stress relaxation,reduce springback and improve the fatigue resisting capability of panel material;appropriate temperature-time and air pressure-time relation curves should be designed to avoid anisotropic which leads to lower yield stress for the aluminium alloy with stress-orienting effect in age forming.As a result,an age forming process of large scale integral aircraft wing panel is proposed,including the temperature-time and air pressure-time relation curves of the clave in the forming process.A modular,standard and flexible method is presented for designing and manufacturing the forming tools.A finite element method is presented for solving the springback problem in age forming process.

Key words: aircraft , manufacturing , technology,  , age , forming,  , integral , aircraft , wing , panel,  , multistep , age , method,  , vibratory , stress , relief , method