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Influence of process parameters on thinning ratio and fittability of bellows hydroforming

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Abstract

Metal bellows are widely used in piping systems, aerospace, automobile and other industries due to their favourable properties including absorption of expansion, light weight and flexibility. In this paper, the fittability was presented to evaluate the convolution shape precision of the metal bellows. By establishing a finite element model of bellows hydroforming process during the bulging and forming stages, the influence of internal pressure, axial feeding and feeding loading path on the wall thickness variation and fittability of one-convolution bellows was investigated. On that basis, the hydroforming process of multi-convolution bellows was studied, and an experiment was carried out. The results showed that with the increase in internal pressure, the wall thickness of the bellows thinned overall, and the fittability of the root zone of the bellows gradually deteriorated. Some region near the crown zone did not fit the dies well when the internal pressure is small. To improve the fittability of the bellows, the actual axial feeding should be a bit less than the theoretical axial feeding. It is of importance in developing the hydroforming technique and improving the hydroforming quality of bellows.

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Acknowledgements

The authors would like to thank the Public Welfare Technology Application Research Projects of Zhejiang Province (2016C31043), the Key Research and Development Project of Zhejiang Province (2020C05008), the National Natural Science Foundation of China (51675478 and 51775489), and the Zhejiang University of Technology, Keqiao Innovation Institute Technology Project (2018KQ012).

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Correspondence to Lanfang Jiang.

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Jiang, L., He, Y., Lin, Y. et al. Influence of process parameters on thinning ratio and fittability of bellows hydroforming. Int J Adv Manuf Technol 107, 3371–3387 (2020). https://doi.org/10.1007/s00170-020-05170-8

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