Skip to main content
SpringerLink
Log in

Comparison of spring-back characteristics in symmetrical and asymmetrical U-bending processes

  • Published:
International Journal of Precision Engineering and Manufacturing Aims and scope Submit manuscript

Abstract

In recent years, increased manufacturing precision of complicated U-shaped parts is required. Such parts are typically fabricated by the U-bending process. However, there is a lack of research on the asymmetrical U-bending process. This results in processing difficulty in the control of spring-back characteristics. Therefore, in this study, the spring-back characteristics in the asymmetrical Ubending process were clearly clarified and compared with those in the symmetrical U-bending process using the finite element method (FEM). Furthermore, the effects of bend angle and tool radius on the spring-back characteristics were also investigated. The results revealed that the asymmetry of the U-shaped parts resulted in changes in bending and reversed bending stress distribution as well as in the spring-back characteristics. Therefore, with asymmetrical bend angles or tool radii in a U-shaped part, the changes in bend angle and/or tool radius on one side resulted in different spring-back characteristics and the obtained bend angle on the other side compared with the symmetrical U-shaped parts. Laboratory experiments were performed to validate the accuracy of the FEM simulation results. Based on the bend angles and bending forces, the FEM simulations showed good agreement with the experiments in terms of both the bend angles and bending forces.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Abbreviations

R d :

Die radius

R p :

Punch radius

R ud :

Upper die radius

t :

Workpiece thickness

W :

U-channel width

WP L :

Workpiece length

θ :

Bend angle

μ :

Friction coefficient

References

  1. Zhang, Y. J., Kim, J. B., Song, J. H., Lee, G. A., Lee, H. J., et al., “FEM Analysis for Laser Bending Process of DP980 Steel Sheet,” Int. J. Precis. Eng. Manuf., vol. 16, no. 2, pp. 315–321, 2015.

    Article  Google Scholar 

  2. Nguyen, D. T., Kim, Y. S., and Jung, D. W., “Finite Element Method Study to Predict Spring-back in Roll-bending of Pre-coated Material and Select Bending Parameters,” Int. J. Precis. Eng. Manuf., vol. 13, no. 8, pp. 1425–1432, 2012.

    Article  Google Scholar 

  3. Panthi, S. K., Ramakrishnan, N., Ahmed, M., Singh, S. S., and Goel, M. D., “Finite Element Analysis of Sheet Metal Bending Process to Predict the Springback,” Materials & Design, vol. 31, no. 2, pp. 657–662, 2010.

    Article  Google Scholar 

  4. Lange, K., “Handbook of Metal Forming,” McGraw-Hill, pp. 19.1–35, 1985.

    Google Scholar 

  5. Thipprakmas, S. and Phanitwong, W., “Finite Element Analysis of Bending Mechanism and Spring-back/Spring-go Feature in Various U-Bending Processes,” Steel Research International, pp. 379–382, 2012.

    Google Scholar 

  6. Phanitwong, W., Sontamino, A., and Thipprakmas, S., “Effects of Part Geometry on Spring-back/Spring-go Feature in U-Bending Process,” Key Engineering Materials, vol. 549, pp. 100–107, 2013.

    Article  Google Scholar 

  7. Cho, J. R., Moon, S. J., Moon, Y. H., and Kang, S. S., “Finite Element Investigation on Spring-Back Characteristics in Sheet Metal UBending Process,” Journal of Materials Processing Technology, vol. 141, no. 1, pp. 109–116, 2003.

    Article  Google Scholar 

  8. Panthi, S. K., Ramakrishnan, N., Pathak, K. K., and Chouhan, J. S., “An Analysis of Springback in Sheet Metal Bending using Finite Element Method (FEM),” Journal of Materials Processing Technology, vol. 186, no. 1–3, pp. 120–124, 2007.

    Article  Google Scholar 

  9. Bakhshi-Jooybari, M., Rahmani, B., Daeezadeh, V., and Gorji, A., “The Study of Spring-back of CK67 Steel Sheet in V-die and U-die Bending Processes,” Materials & Design, vol. 30, no. 7, pp. 2410–2419, 2009.

    Article  Google Scholar 

  10. Sim, S. B., Lee, S. T., and Jang, C. H., “A Study on the Development of Center Carrier Type Progressive Die for U-bending Part Process,” Journal of Materials Processing Technology, Vols. 153–154, pp. 1005–1010, 2004.

    Article  Google Scholar 

  11. Zhang, D., Cui, Z., Ruan, X., and Li, Y., “An Analytical Model for Predicting Springback and Side Wall Curl of Sheet after Ubending,” Computational Materials Science, vol. 38, no. 4, pp. 707–715, 2007.

    Article  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Tool and Materials Engineering, King Mongkut’s University of Technology Thonburi, Thonburi, 10140, Thailand

    Sutasn Thipprakmas

  2. Graduate student, Department of Tool and Materials Engineering, King Mongkut’s University of Technology Thonburi, Thonburi, 10140, Thailand

    Untika Boochakul

Authors
  1. Sutasn Thipprakmas
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Untika Boochakul
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Sutasn Thipprakmas.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Thipprakmas, S., Boochakul, U. Comparison of spring-back characteristics in symmetrical and asymmetrical U-bending processes. Int. J. Precis. Eng. Manuf. 16, 1441–1446 (2015). https://doi.org/10.1007/s12541-015-0190-2

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s12541-015-0190-2

Keywords

Search

Navigation