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Residual stresses and springback reduction in U-channel drawing of Al5182-O by using a servo press and a servo hydraulic cushion

  • A. FallahiarezoodarEmail author
  • T. Gupta
  • C. Goertemiller
  • T. Altan
Computer Aided Engineering
  • 14 Downloads

Abstract

The increasing use of aluminum alloys in automotive industry brings new challenges regarding formability and springback. Servo presses and servo hydraulic cushions can accurately control ram motion and blank holder force during the forming process, reducing the difficulties encountered in forming Al alloys. This study presents an experimental and numerical analysis of springback and residual stresses induced during the U-channel drawing of Al 5182-O. During the U-channel drawing, the draw-in of the sheet material into the die cavity is controlled by blank holder force. So, the material is under stretch bending condition when it slides around the die corner radius. When the material passes the die corner radius it unbends. The reverse loading resulted from the unbending process provides heterogeneous stress distribution through the sheet thickness in the wall section. The effect of post stretching, applied by the use of a servo hydraulic cushion, on reduction of residual stresses and springback at the wall is investigated. The benefit of using servo hydraulic cushion for reducing springback and residual stresses has been demonstrated experimentally. Results illustrate a significant reduction of residual stresses and springback when post stretching is applied.

Keywords

Springback Aluminum alloys Finite element 

Notes

Acknowledgements

The authors gratefully appreciate Hyson Metal Forming Solutions for providing the servo press and servo cushion. Also, special thanks to Mr. Ethan McLaughlin for supporting the experiments.

References

  1. 1.
    Komgrit L, Hamasaki H, Hino R, Yoshida F (2016) Elimination of springback of high-strength steel sheet by using additional bending with counter punch. J Mater Process Technol 229:199CrossRefGoogle Scholar
  2. 2.
    Lee JW, Lee MG, Barlat F (2012) Finite element modeling using homogeneous anisotropic hardening and application to springback prediction. Int J Plast 29:13CrossRefGoogle Scholar
  3. 3.
    Yu HY (2009) Variation of elastic modulus during plastic deformation and its influence on springback. Mater Des 30 846CrossRefGoogle Scholar
  4. 4.
    Xue X, Liao J, Vincze G, Pereira A, Barlat F (2016) Experimental assessment of nonlinear elastic behavior of dual-phase steels and application to springback prediction. Int J Mech Sci 117:1CrossRefGoogle Scholar
  5. 5.
    Gil I, Mendiguren J, Galdos L, Mugarra E, Argandona E (2016) Influence of the pressure dependent coefficient of friction on deep drawing springback predictions. Tribol Int 103 266CrossRefGoogle Scholar
  6. 6.
    Wang W, Zhao Y, Wang Z, Hua M, Wei X (2016) A study on variable friction model in sheet metal forming with advanced high strength steels. Tribol Int 93 17CrossRefGoogle Scholar
  7. 7.
    Eggertsen P-A, Mattiasson K (2012) Experiences from experimental and numerical springback studies of a semi-industrial forming tool. Int J Mater Form 5:341CrossRefGoogle Scholar
  8. 8.
    Wagoner RH, Lim H, Lee M-G (2013) Advanced issues in springback. Int J Plast 45:3CrossRefGoogle Scholar
  9. 9.
    Gan W, Wagoner RH (2004) Die design method for sheet springback. Int J Mech Sci 46:1097CrossRefGoogle Scholar
  10. 10.
    Ayres RA (1984) SHAPESET: a process to reduce sidewall curl springback in high strength steel rails. J Appl Metalwork 3(2):127CrossRefGoogle Scholar
  11. 11.
    Liu G, Lin Z, Bao Y, Cao J (2002) Eliminating springback error in U-Shaped part forming by variable blankholder force. J Mater Eng Perform 11(1):64CrossRefGoogle Scholar
  12. 12.
    McLaughlin E, Gupta T, Fallahiarezoodar A, Altan T (2018) Reducing springback in hat-shape bending with variable BHF using a servo-hydraulic cushion. Stamp J March/April, pp 16–17Google Scholar
  13. 13.
    Sun L, Wagoner RH (2011) Complex unloading behavior: nature of the deformation and its consistent constitutive representation Int J Plast 27 1126–1144CrossRefzbMATHGoogle Scholar

Copyright information

© German Academic Society for Production Engineering (WGP) 2019

Authors and Affiliations

  • A. Fallahiarezoodar
    • 1
    Email author
  • T. Gupta
    • 1
  • C. Goertemiller
    • 1
  • T. Altan
    • 1
  1. 1.Center for Precision FormingThe Ohio State UniversityColumbusUSA

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