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Crack defect of tailor rolled blank in deep drawing process

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Abstract

The deformation process of tailor rolled blank (TRB) is different from that of a monolithic blank as a result of the variable thickness in the rolling direction, and thus, the mechanism of the crack phenomenon needs to be further studied. The crack defect of TRB square box was studied by numerical simulation and stamping experiment. The stress state of TRB square box was elaborated. On this basis, the forming characteristics of TRB square box were summarized. The effects of blank size and blank holder force (BHF) on the thickness thinning of TRB were discussed. Finally, the mechanism of the crack defect for TRB square box was revealed. Results indicate that non-uniformity is the most prominent characteristic during forming of TRB square box. The larger the blank size and BHF on the thinner side are, the more inclined TRB is to crack. Excessive BHF or insufficient BHF on the thicker side can also lead to the occurrence of the crack defect. BHF on the thinner side slightly greater than that on the thicker side (40 kN on the thinner side and 20 kN on the thicker side) is advantageous to restrict the excessive thickness thinning of TRB and acquire a better formability. The location inclined to crack for TRB square box is the round corner of the wall on the thinner side.

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Acknowledgements

This work was funded by National Natural Science Foundation of China (51475086), Natural Science Foundation of Hebei Province (E2016501118), Fundamental Research Funds for the Central Universities (N172304036) and Science and Technology Research Project for Higher School of Hebei Province (ZD2017315).

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Authors and Affiliations

  1. School of Mechanical Engineering and Automation, Northeastern University, Shenyang, 110819, Liaoning, China

    Hua-wei Zhang, Jia-lu Wu & Xin-gang Wang

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  1. Hua-wei Zhang
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  2. Jia-lu Wu
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  3. Xin-gang Wang
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Correspondence to Hua-wei Zhang.

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Zhang, Hw., Wu, Jl. & Wang, Xg. Crack defect of tailor rolled blank in deep drawing process. J. Iron Steel Res. Int. 25, 1237–1243 (2018). https://doi.org/10.1007/s42243-018-0184-2

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  • DOI: https://doi.org/10.1007/s42243-018-0184-2

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