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<p>Local thickening, thinning, and thickness nonuniformity are critical quality issues in deep drawing followed by redrawing of a 316&#xa0;L stainless steel bottom head for nuclear waste storage tanks. In this study, a constitutive model was established from uniaxial tensile tests, and a two-step finite element model was developed to investigate wall-thickness evolution during forming. The effects of punch speed, blank-holder force, and friction coefficient on thickness distribution were analyzed, and a three-factor, four-level orthogonal design was used to optimize the process parameters based on a thickness-distribution uniformity index. The results show that the spatial locations of the thickness extrema remain nearly unchanged under different process conditions. The minimum thickness is mainly located in the fillet transition zone after the first-step drawing and shifts to the top corner region after the second-step redrawing, whereas the maximum thickness remains near the lower edge of the sidewall. Among the three factors, the friction coefficient has the strongest effect on thickness-distribution uniformity, followed by punch speed and blank-holder force. Within the investigated parameter ranges, the preferred parameter combination for thickness control is a punch speed of 7000&#xa0;mm/s, a blank-holder force of 870 kN, and a friction coefficient of 0.18. Forming experiments show good agreement with the numerical predictions, indicating that the proposed model can provide reasonable support for thickness prediction and process optimization.</p>

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Thickness distribution and process optimization in deep drawing followed by redrawing of a 316 L bottom head for nuclear waste storage tanks

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Junqi Liu,
  • Bensheng Huang,
  • Dongmei Liang,
  • Jianneng Zheng,
  • Yongyou Zhu,
  • Hongyu He

摘要

Local thickening, thinning, and thickness nonuniformity are critical quality issues in deep drawing followed by redrawing of a 316 L stainless steel bottom head for nuclear waste storage tanks. In this study, a constitutive model was established from uniaxial tensile tests, and a two-step finite element model was developed to investigate wall-thickness evolution during forming. The effects of punch speed, blank-holder force, and friction coefficient on thickness distribution were analyzed, and a three-factor, four-level orthogonal design was used to optimize the process parameters based on a thickness-distribution uniformity index. The results show that the spatial locations of the thickness extrema remain nearly unchanged under different process conditions. The minimum thickness is mainly located in the fillet transition zone after the first-step drawing and shifts to the top corner region after the second-step redrawing, whereas the maximum thickness remains near the lower edge of the sidewall. Among the three factors, the friction coefficient has the strongest effect on thickness-distribution uniformity, followed by punch speed and blank-holder force. Within the investigated parameter ranges, the preferred parameter combination for thickness control is a punch speed of 7000 mm/s, a blank-holder force of 870 kN, and a friction coefficient of 0.18. Forming experiments show good agreement with the numerical predictions, indicating that the proposed model can provide reasonable support for thickness prediction and process optimization.