Abstract
The compound process of hot stamping and solution quenching heat treatment (HFQ®) was utilized to fabricate hard aluminium fairing of high aspect ratio. A simulation model was established by MSC.Marc to optimize the shape and size of the blamk as well as the effects of process parameters, namely, initial temperature, stamping speed, blank holder force (BHF), on extreme final temperature and thickness distribution of formed component were investigated. The reliability of finite element simulation was proved by the hot stamping experiments with self-designed moulds under the optimize process parameters achieved by simulation results. The results indicated that the optimized blank is well deformed without flange wrinkle and broken round; the maximum cooling rate in quenching can inhibite the precipitation when the initial temperature ranges from 350 to 450℃; BHF effects dominated on thickness distribution and 10KN is the most reasonable value under the studied condition while the optimum stamping speed is 100mm•s-1. Compared with the thickness of the stamping trials and numerical simulation, the deviation is less than 3.6%. Furthermore, The desired mechanical property is achieved without significant inhomogeneity.
Highlights
Nowadays, lightweighting is one of the most importance development directions on the aerospace industries
The lightweight and high strength characteristics of duralumin alloy, represented by the AlCu-Mg alloy in 2XXX series, determine its application prospects in aerospace and other industries[1].The duralumin alloy is mainly characterized by low density, high specific strength and good heat resistance, and its mechanical properties can be significantly strengthened by solution and aging
Some studies have shown that the duralumin alloy will produce dynamic recovery and dynamic recrystallization softening during the deformation under the elevated temperature, which will weaken or eliminate the work hardening caused during the deformation process[4]
Summary
Nowadays, lightweighting is one of the most importance development directions on the aerospace industries. In this paper, 2A12 aluminum alloy thinwalled fairing with large aspect ratio that widely used in aerospace vehicle are taken as the object of this study to conduct a feasibility study on the compound process of hot stamping and quenching heat treatment, which known as HFQ® [15]. This process are considered to be an integrated high-efficiency and short-flow method to achieve the shape and performance of the component.
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