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Research on technological parameters of pressure forming with hot granule medium on AA7075 sheet

  • Materials, Metallurgy, Chemical and Environmental Engineering
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Abstract

Hot granule medium pressure forming (HGMF) process is a new process in which granule medium replaces the medium in existing flexible-die hot forming process, such as liquids, gases or viscous medium. Hot forming of light alloy sheet parts can be realized based on the properties of granule medium, such as withstanding high temperature and pressure, filling well, sealing and loading easily. In this work, the forming of AA7075 cylindrical parts by HGMF process is taken as an example to establish the constitutive relation and forming limit diagram (FLD) of AA7075 sheet which is related to temperature by hot uniaxial tensile test of sheet metal. Based on the assumption that granule medium is applied to extended Drucker-Prager linear material model, the finite element model of HGMF process is established and the effect of technological parameters, such as forming temperature, blank-holder gap and drawing ratio, on the sheet metal formability, is studied. The limit drawing ratio curve of AA7075 cylindrical parts at forming temperature of 175−300 °C is obtained by HGMF process test, and the limit drawing ratio reaches the maximum value of 1.71 at 250 °C. The results of numerical simulation are consistent with the results of process test, and the forming force, distribution of wall thichness and form of instability are predicted correctly, which provides reference for the application of HGMF process.

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Authors and Affiliations

  1. College of Vehicles and Energy, Yanshan University, Qinhuangdao, 066004, China

    Guo-jiang Dong  (董国疆)

  2. Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education, Yanshan University, Qinhuangdao, 066004, China

    Chang-cai Zhao  (赵长财), Jian-pei Zhao  (赵建培), Yuan-yuan Ya  (押媛媛) & Miao-yan Cao  (曹秒艳)

Authors
  1. Guo-jiang Dong  (董国疆)
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  2. Chang-cai Zhao  (赵长财)
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  3. Jian-pei Zhao  (赵建培)
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  4. Yuan-yuan Ya  (押媛媛)
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  5. Miao-yan Cao  (曹秒艳)
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Corresponding author

Correspondence to Chang-cai Zhao  (赵长财).

Additional information

Foundation item: Projects(51305386, 51305385) supported by the National Natural Science Foundation of China; Project(E2013203093) supported by the Natural Science Foundation of Hebei Province, China

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Dong, Gj., Zhao, Cc., Zhao, Jp. et al. Research on technological parameters of pressure forming with hot granule medium on AA7075 sheet. J. Cent. South Univ. 23, 765–777 (2016). https://doi.org/10.1007/s11771-016-3122-0

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  • DOI: https://doi.org/10.1007/s11771-016-3122-0

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