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<p>A near-net forming technology of superplastic isothermal stamping has been developed by the Aerospace Research Institute of Materials and Proceeding Technology for manufacturing large cryogenic gas cylinders. In this paper, the effects of mold detail design and forming process parameters on forming pressure and wall thickness distribution of TA7ELI titanium alloy hemispheres were studied. The finite element software ABAQUS was used to simulate and analyze the forming process. The molded hemisphere shell shows that the wall thickness distribution of the shell is highly consistent with the numerical simulation results. All parts of the shell maintain an obvious isoaxial recrystallization structure and anisotropic characteristics, showing excellent mechanical properties at 20&#xa0;K low temperature.</p>

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A Study of the Effects of Superplastic Isothermal Stamping Die Design and Process Parameters on the Wall Thickness and Properties of Large Hemispherical Gas Cylinder

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Wei Ji,
  • Zhaohuang Zhang,
  • Zichuan Lu,
  • Shi Wei

摘要

A near-net forming technology of superplastic isothermal stamping has been developed by the Aerospace Research Institute of Materials and Proceeding Technology for manufacturing large cryogenic gas cylinders. In this paper, the effects of mold detail design and forming process parameters on forming pressure and wall thickness distribution of TA7ELI titanium alloy hemispheres were studied. The finite element software ABAQUS was used to simulate and analyze the forming process. The molded hemisphere shell shows that the wall thickness distribution of the shell is highly consistent with the numerical simulation results. All parts of the shell maintain an obvious isoaxial recrystallization structure and anisotropic characteristics, showing excellent mechanical properties at 20 K low temperature.