Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
권호 표지
DOI QR코드

DOI QR Code

Investigation of Springback Behavior of DP780 Steel Sheets after the U-bending Process

U-bending에서의 DP780 강판의 스프링백 거동 연구

  • 최민국 (한국과학기술원 기계항공시스템학부) ;
  • 허훈 (한국과학기술원 기계항공시스템학부)
  • Received : 2012.07.05
  • Accepted : 2012.08.31
  • Published : 2012.10.01
Download PDF
⟨ Previous Next ⟩

Abstract

Sheet metal forming processes induce residual stress in the final product due to plastic deformation. The residual stress leads to elastic recovery of the formed part called springback, which causes shape errors in the final product. This error is a serious issue, especially for high strength steels, which are widely used in auto-body structures. Therefore, the evaluation of the amount of springback becomes critical for high strength steels. This paper investigates the springback behavior of DP780 steel sheets after the U-bending process using the geometry of the standard U-shape tool from the NUMISHEET'93 benchmark problem. The amounts of springback were measured as a function of the intrusion direction, forming speed and blank holding force.

Keywords

References

  1. J. Huh, H. Huh, C. S. Lee, 2011, Effect of Strain Rate on the Anisotropic Deformation Behavior of Advanced High Strength Steel Sheets, Trans. Mater. Process, Vol. 20, No. 8, pp. 595-600. https://doi.org/10.5228/KSTP.2011.20.8.595
  2. H. Huh, S. B. Kim, J. H. Song, J. H. Lim, 2008, Dynamic Tensile Characteristics of TRIP-type and DP-type Steel Sheets for an Auto-Body, Int. J. Mech. Sci., Vol. 50, No. 5, pp. 918-931 https://doi.org/10.1016/j.ijmecsci.2007.09.004
  3. H. Huh, J. H. Lim, S. H. Park, 2009, High Speed Tensile Test of Steel Sheets for the Stress-strain Curve at the Intermediate Strain Rate, Int. J. Automot. Technol., Vol. 10, No. 2, pp. 195-204. https://doi.org/10.1007/s12239-009-0023-3
  4. H. S. Kim, M. Koc, 2008, Numerical Investigations on Springback Characteristics of Aluminum Sheet Metal Alloys in Warm Forming Conditions, J. Mater. Process. Technol., Vol. 204, No. 1, pp. 370-383. https://doi.org/10.1016/j.jmatprotec.2007.11.059
  5. C. Gomes, O. Onipede, M. Lovell, 2005, Investigation of Springback in High Strength Anisotropic Steels, J. Mater. Process. Technol., Vol. 159, No. 1, pp. 91-98. https://doi.org/10.1016/j.jmatprotec.2004.04.423
  6. D. Zhang, Z. Cui, X. Ruan, Y. Li, 2007, An Analytical Model for Predicting Springback and Side Wall Curl of Sheet after U-bending, Int. J. Comput. Mater. Sci., Vol. 38, No. 1, pp. 707-715. https://doi.org/10.1016/j.commatsci.2006.05.001

Cited by

  1. Application of Springback Analysis in the Development of a Reinforce Center Pillar Stamping Die vol.23, pp.5, 2014, https://doi.org/10.5228/KSTP.2014.23.5.297
  2. An Analysis on Durability Improvement of Twist Run Exercise Equipment vol.13, pp.5, 2014, https://doi.org/10.14775/ksmpe.2014.13.5.116