Abstract
Due to the complicated deformation characteristics of thin-walled bellows with different specifications and its sensitivity to forming parameters in hydroforming (mainly referring to internal pressure), the process may encounter defects, i.e., overthinning, cracking, and wrinkling. To avoid defects and achieve products with high quality, it is a challenge to carry out reliable evaluation of the deformation behaviors of thin-walled bellows induced by the “size effect” with considering the inevitable fluctuation of pressure. In the paper, the hydroforming characteristics (including wall thinning degree and springback) of thin-walled 316-L bellows induced by geometry factors such as inner diameter, wall thickness, convolution width, and convolution height are clarified using finite element (FE) simulations. Meanwhile, deformation characteristics of the bellow considering pressure change are discussed. The numerical simulation results illustrated that the wall thinning degree and springback values of bellows are significantly affected by size factors, and are sensitive to pressure change when decreasing initial wall thickness and increasing convolution height. The results provide a better understanding of the process and a guideline to realize precision forming.
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Acknowledgements
The authors would like to thank the fund of the National Natural Science Foundation of China (No. 51405386), the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2014JQ7237, No. 2017JM5103), the State Key Laboratory of Solidification Processing in NWPU (No. SKLSP201403, No. SKLSP201622), the Young Talent fund of University Association for Science and Technology in Shaanxi, China (No. 20170518), and the Program for Young Innovative Research Team in Xi’an Shiyou University (No. 2015QNKYCXTD02).
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Liu, J., Li, H., Liu, Y. et al. “Size effect” related hydroforming characteristics of thin-walled 316-L bellow considering pressure change. Int J Adv Manuf Technol 98, 505–522 (2018). https://doi.org/10.1007/s00170-018-2280-7
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DOI: https://doi.org/10.1007/s00170-018-2280-7