大直径铝合金双曲率薄壁件拉深成形技术

为提高运载火箭贮箱的研制效率,利用有限元仿真技术对某运载火箭贮箱瓜瓣零件的成形工艺进行研究。采取理论分析、数值模拟等手段,分析了压边力、压边形式、压延筋、模具间隙等工艺参数对瓜瓣零件成形的影响,对拉深模结构形式及其工艺参数进行优化。结果表明:采用"双曲面+单拉延筋"设计,当模具间隙设为18 mm时,成形零件的最大减薄率在10%以内,满足设计指标要求。

Deep Drawing Technology for Large Diameter Double Curvature Aluminum Alloy Thin-Walled Part

In order to improve the development efficiency of the carrier rocket tank, this paper studies the forming process of a new carrier rocket melon petal part by use of the finite element simulation technology, and finds the influence of key factors such as blank holder force, blank holder surface, draw-bead structure and die clearance based on theoretical analysis and numerical simulation. The mould structure and its technical parameters are optimized. The results show that by use of the double curved blank holder surface with the single draw-bead, the thinning rate of the forming part is less than 10% when the die clearance is 18 mm, which satisfies design requirements.