With the rapid development of aerospace industry, aluminum alloy, as a lightweight material, plays an important role in aerospace field. Among them, 7A09 ultra-high strength aluminum alloy, represented by Al Zn mg Cu, has been widely used in the manufacture of engine combustion chamber shell, rocket skeleton and aircraft hub for its low density, high strength and corrosion resistance. Truss is the most common structural form in aviation rocket. At present, truss reinforced structure is mostly used in the rocket body structure of launch vehicle. Truss structure mainly plays a supporting role in the arrow body, bearing axial load, internal pressure and bending moment. The quality and performance of its material will directly affect the strength of the arrow body structure. The research shows that the application of light material of truss structure can not only reduce the total mass of rocket body, but also play an important role in improving the reliability and safety of launch vehicle. As a high-strength lightweight material,
7A09 aluminum alloy plate sheet can not only meet the lightweight requirements of truss stiffeners, but also meet the strength requirements of truss stiffeners. Therefore,
7A09 aluminum alloy plate sheet has become the preferred material for manufacturing truss stiffeners.
7A09 aluminum alloy plate sheet due to the poor room temperature forming performance, the cold stamping process is easy to cause wrinkling, crack, rebound and other defects of the formed parts, which affects the forming accuracy of the parts. Moreover, the warm forming process is between cold and hot processing, so there is no need for heat treatment after forming, avoiding heat treatment deformation, and the production efficiency is significantly improved.
7A09 aluminum alloy plate sheet has poor formability at room temperature. Increasing the deformation temperature can improve the plasticity and reduce the deformation resistance of aluminum alloy, so as to improve the formability.
