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Relationship between mechanical properties and geometric parameters to limitation condition of springback based on springback–radius concept in V-die bending process

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Abstract

The determination of the accuracy of part geometry is based on the precise prediction of the springback–radius in sheet bending. Incorporating strength ratio, normal anisotropy, the strain-hardening exponent, and the geometric ratio, a simplified model is proposed to predict the springback–radius in V-die bending based on elementary bending theory. Experiments were conducted to validate the derived equation based on the proposed modeling for this radius. The calculation of springback–radius agrees closely with the experimental results, proving the reliability of the present model. To reduce springback and achieve the correct radius of bent parts in the sheet bending process, the effects of process parameters, including punch radius, material strength and sheet thickness, on springback–radius ratio (punch radius divided by the radius of bending after unloading) were experimentally examined to identify those that govern springback variations for a high-strength steel sheet. The manner in which the strength ratio (material constant divided by elastic constant), normal anisotropy, strain-hardening exponent, and geometric ratio (sheet thickness divided by punch diameter) affect springback–radius in the V-die bending process for high-strength steel sheet is theoretically examined. Finally, a relationship between mechanical properties and geometric parameters to limitation condition of springback based on springback–radius concept in V-die bending process is examined. The goal is to improve the accuracy of the springback–radius after unloading in the V-die bending process.

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Acknowledgments

H. Y. Chou is appreciated for the help in the experiments.

Funding

The author would like to thank the Ministry of Science and Technology of the Republic of China, Taiwan, for financially supporting this research under Contract No. MOST 106-2221-E-149-001.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Taipei City University of Science and Technology, No. 2, Xueyuan Road, Beitou, Taipei, 112, Taiwan, Republic of China

    Daw-Kwei Leu

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  1. Daw-Kwei Leu
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Correspondence to Daw-Kwei Leu.

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Leu, DK. Relationship between mechanical properties and geometric parameters to limitation condition of springback based on springback–radius concept in V-die bending process. Int J Adv Manuf Technol 101, 913–926 (2019). https://doi.org/10.1007/s00170-018-2970-1

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  • DOI: https://doi.org/10.1007/s00170-018-2970-1

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