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Effects of pre-bulging on 2024 aluminum alloy complex-shaped components

  • Aluminum
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Abstract

To improve the poor plasticity of 2024 aluminum alloy sheet, which causes wrinkle and fracture in conventional deep drawing of complexshaped components, hydromechanical deep drawing (HDD) with pre-bulging was investigated. The loading paths of chamber pressure and pre-bulging pressure were designed and optimized by numerical simulations and experiments, and effects of loading paths were obtained and analyzed for thickness, stress and defects. A reasonable loading path was determined. Thickness is more uniform when pre-bulging pressure is 2 MPa and chamber pressure is 15 MPa. The suspending area of a blank wrinkles easily between the punch and the die when pre-bulging pressure is smaller than 1.5 MPa; fracture occurs for the suspending area of blank between the punch and the die when pre-bulging pressure is larger than 8 MPa. The results show that a helpful friction can be generated, the stress state can be improved, and fracture and wrinkle can be avoided by a reasonable pre-bulging in the suspending area of the blank for a complex-shaped component. The uniformity of thickness and forming limit can be enhanced.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China

    Yongchao Xu, Xin Liu & Shijian Yuan

  2. College of Materials Science and Engineering, Harbin Institute of Science and Technology, Harbin, 150001, China

    Feng Li

Authors
  1. Yongchao Xu
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  2. Feng Li
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  3. Xin Liu
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  4. Shijian Yuan
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Corresponding author

Correspondence to Yongchao Xu.

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Xu, Y., Li, F., Liu, X. et al. Effects of pre-bulging on 2024 aluminum alloy complex-shaped components. JOM 63, 39–41 (2011). https://doi.org/10.1007/s11837-011-0074-6

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  • DOI: https://doi.org/10.1007/s11837-011-0074-6

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