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Experimental exploration of electrical pulse-assisted roller hemming of AZ31B magnesium alloy sheet

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Abstract

The purpose of this research is to explore the feasibility of roller hemming of AZ31B magnesium alloy sheet. During the test, a special experimental setup considering the current flow and insulation was designed and employed. For the sake of simplicity, the flat surface-straight edge hemming style was selected. Electrical pulses were introduced in the pre-hemming and final hemming processes. The results show that when hemming at 448 K with hemming speed of 30 mm/min, AZ31B magnesium alloy sheet was successfully hemmed with excellent perceived quality. No recoil/warp defect, cracking or springback was observed. Electrical pulses induced dynamic recrystallized grains were observed along the grain boundaries in the severely deformed area, which is of great importance to the improvement of the ductility of the material. The hardness was slightly increased after hemming with electrical pulses, and this fact could improve the friction resistance performance of the hemmed part.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai, 200030, China

    Huanyang Xie  (解焕阳), Kai Liu  (刘 凯), Qian Wang  (王 倩), Fang Peng  (彭 芳), Linqiang Fang  (方林强) & Xianghuai Dong  (董湘怀)

  2. General Motor China Science Laboratory, Shanghai, 201206, China

    Jianfeng Wang  (王建峰)

Authors
  1. Huanyang Xie  (解焕阳)
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  2. Kai Liu  (刘 凯)
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  3. Qian Wang  (王 倩)
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  4. Fang Peng  (彭 芳)
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  5. Linqiang Fang  (方林强)
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  6. Xianghuai Dong  (董湘怀)
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  7. Jianfeng Wang  (王建峰)
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Corresponding author

Correspondence to Xianghuai Dong  (董湘怀).

Additional information

Foundation item: the National Natural Science Foundation of China (Nos. 50975174 and 51275297)

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Xie, H., Liu, K., Wang, Q. et al. Experimental exploration of electrical pulse-assisted roller hemming of AZ31B magnesium alloy sheet. J. Shanghai Jiaotong Univ. (Sci.) 21, 557–561 (2016). https://doi.org/10.1007/s12204-016-1762-8

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  • DOI: https://doi.org/10.1007/s12204-016-1762-8

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