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<p>Tailor-rolled blank (TRB) demonstrates great potential in the field of automotive lightweight, and thus the research on the formability of TRB is of high practical value. In this paper, the formability of tailor-rolled blank under different blank holder force (BHF) modes was studied through numerical simulations and stamping experiments by taking square box as the research object. The effects of BHF value and BHF type on the formability of TRB were analyzed, and the thickness thinning and the thickness transition zone (TTZ) movement for TRB part under different BHF modes were discussed. The findings indicate that BHF plays an important role in the forming process of TRB. The segmented blank holder and the stepped mold gap adjustment plate can provide different BHFs and a uniform blank holding gap for the thinner side and the thicker side. Constant BHF and greater BHF value on the thinner side than that on the thicker side (4&#xa0;tons on the thinner side and 2&#xa0;tons on the thicker side) independent of time are beneficial for improving the formability of TRB.</p>

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Effects of blank holder force modes on thickness thinning and transition zone movement of tailor rolled blank

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • Huawei Zhang,
  • Jialu Wu,
  • Yongzhen Gong,
  • Xingang Wang

摘要

Tailor-rolled blank (TRB) demonstrates great potential in the field of automotive lightweight, and thus the research on the formability of TRB is of high practical value. In this paper, the formability of tailor-rolled blank under different blank holder force (BHF) modes was studied through numerical simulations and stamping experiments by taking square box as the research object. The effects of BHF value and BHF type on the formability of TRB were analyzed, and the thickness thinning and the thickness transition zone (TTZ) movement for TRB part under different BHF modes were discussed. The findings indicate that BHF plays an important role in the forming process of TRB. The segmented blank holder and the stepped mold gap adjustment plate can provide different BHFs and a uniform blank holding gap for the thinner side and the thicker side. Constant BHF and greater BHF value on the thinner side than that on the thicker side (4 tons on the thinner side and 2 tons on the thicker side) independent of time are beneficial for improving the formability of TRB.