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采用正反胀形法对薄壁壳体的壁厚分布进行了改善。首先通过数值模拟的方法,模拟了正胀形及两种不同反胀形模具气胀过程,进行了模具的设计制造;然后对正胀形及正反胀形进行了实验验证,并比较了两种不同反胀形形状对最终零件壁厚分布的影响,提出了用壁厚分布均方差判定壁厚均匀性的判据。研究表明,与正胀形相比,采用两种正反胀形法成形的零件的最小壁厚从0.69 mm增加到0.91 mm和0.89 mm,使零件的壁厚分布均方差从0.1236降低到0.0727和0.0642,证明了正反胀形法可以改善5A06铝合金壁厚分布均匀性。
The wall thickness distribution of the thin walled shell is improved by the positive and negative bulging method. Firstly, numerical simulation is used to simulate the bulging process and two kinds of different anti-bulging mold inflation process, the design and manufacture of the mold; and then positive bulging and positive and negative bulging were experimentally verified, and compared the two The influence of different kinds of anti-bulging shapes on the thickness distribution of the final part is put forward. The criteria for determining the thickness uniformity by using the mean square error of the wall thickness distribution are proposed. The results show that the minimum wall thickness of the parts formed by two kinds of positive and negative bulging methods is increased from 0.69 mm to 0.91 mm and 0.89 mm compared with that of the normal bulging. The mean square deviation of the wall thickness distribution of the part is reduced from 0.1236 to 0.0727 and 0.0642 , Proves that positive and negative bulging shape method can improve the 5A06 aluminum alloy wall thickness distribution uniformity.