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Abstract：
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In the process of large expansion rate parts with complex cross section formed by the traditional hydroforming process, it is difficult for the materials to flow uniformly in the ring direction due to the die surface restriction, and the failure of forming occurs. For the above problems, the forming law of the dangerous points was summarized, the geometrical model and the mechanical model were established, the distribution law of the stress along the circumferential direction was obtained, and the reason of the deformation instability of the dangerous point was pointed out by the finite element simulation method. Then, a new process of multi-step hydroforming process was presented by decomposing the material along the circumferential deformation process into two stages namely, tensile deformation on the ring and buckling deformation on the shape, and the tests were verified for the guide vane liner tube of the aero-engine. Results show that the multi-step tube hydroforming technology can effectively reduce the thinning of materials at high pressure forming stage to improve the forming precision and reduce equipment load.
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Funds：
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AuthorIntro：
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作者简介：阮尚文（1987-），男，博士研究生
E-mail：ruanshangwen@buaa.edu.cn
通讯作者：郎利辉（1970-），男，博士，教授
E-mail：lang@buaa.edu.cn
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Reference：
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