Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Improvement of Formability in Automobile Panels by Variable Blank Holding Force with Consideration of Nonlinear Deformation Path

비선형변형경로를 고려한 가변 블랭크 홀딩력을 통한 자동차 판넬의 성형성 향상

  • Jeong, Hyun Gi (Die Design Team, Sungwoo Hightech) ;
  • Jang, Eun Hyuk (Deptartment of Product Design and Manufacturing Engineering, Graduate School, Seoul National University of Science and Technology) ;
  • Song, Youn Jun (Press Stamping Tool Design Team, Hyundai Motors Corporation Tooling Center) ;
  • Chung, Wan Jin (Department of Mechanical System Design Engineering, Seoul National University of Science and Technology)
  • 정현기 (성우하이텍 금형설계팀) ;
  • 장은혁 (서울과학기술대학교 대학원 제품설계금형공학과) ;
  • 송윤준 (현대자동차 툴링센터 프레스금형설계팀) ;
  • 정완진 (서울과학기술대학교 기계시스템디자인공학과)
  • Received : 2015.08.28
  • Accepted : 2015.10.12
  • Published : 2015.11.01
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Abstract

In drawing sheet metal, the blank holding force is applied to prevent wrinkling of the product and to add a tensile stress to the material for the plastic deformation. Applying an inappropriate blank holding force can cause wrinkling or fracture. Therefore, it is important to determine the appropriate blank holding force. Recent developments of the servo cushion open up the possibility to reduce the possibility of fracture and wrinkling by controlling the blank holding force along the stroke. In this study, a method is presented to find the optimal variable blank holding force curve, which uses statistical analysis with consideration of the nonlinear deformation path. The optimal blank holding force curve was numerically and experimentally applied to door inner parts. Consequently, it was shown that the application of the variable blank holding force curve to door inner parts could effectively reduce the possibility of fracture and wrinkling.

Keywords

References

  1. Doege, E. and Sommer, N., "Optimization of the Blank-Holder Force on Deep Drawing of Rectangular Parts," Stahl Eisen, Vol. 103, No. 3, pp. 139-142, 1983.
  2. Zhong-Qin, L., Wu-Rong, W., and Guan-Long, C., "A New Strategy to Optimize Variable Blank Holder Force towards Improving the Forming Limits of Aluminum Sheet Metal Forming," Journal of Materials Processing Technology, Vol. 183, No. 2, pp. 339-346, 2007. https://doi.org/10.1016/j.jmatprotec.2006.10.027
  3. Gunnarsson, L. and Schedin, E., "Improving the Properties of Exterior Body Panels in Automobiles Using Variable Blank Holder Force," Journal of Materials Processing Technology, Vol. 114, No. 2, pp. 168-173, 2001. https://doi.org/10.1016/S0924-0136(01)00727-0
  4. Kitayama, S., Hamano, S., Yamazaki, K., Kubo, T., Nishikawa, H., et al., "A Closed-Loop Type Algorithm for Determination of Variable Blank Holder Force Trajectory and Its Application to Square Cup Deep Drawing," The International Journal of Advanced Manufacturing Technology, Vol. 51, No. 5-8, pp. 507-517, 2010. https://doi.org/10.1007/s00170-010-2656-9
  5. Wang, L. and Lee, T., "Controlled Strain Path Forming Process with Space Variant Blank Holder Force Using RSM Method," Journal of Materials Processing Technology, Vol. 167, No. 2, pp. 447-455, 2005. https://doi.org/10.1016/j.jmatprotec.2005.06.017
  6. Chengzhi, S., Guanlong, C., and Zhongqin, L., "Determining the Optimum Variable Blank-Holder Forces Using Adaptive Response Surface Methodology (ARSM)," The International Journal of Advanced Manufacturing Technology, Vol. 26, No. 1-2, pp. 23-29, 2005. https://doi.org/10.1007/s00170-003-1979-1
  7. Jeong, H. G., "Numerical Study on the Improvement of Formability of Automobile Panel by Blank Holding Force Control," M.Sc. Thesis, Department of Product Design and Manufacturing and Engineering, Seoul National University of Science and Technology, 2015.
  8. Cha, S. H., Lee, C. J., Lee, S. K., Kim, B. H., Ko, D. C., et al., "An Effective Design Method of Stamping Process by Feasible Formability Diagram," J. Korean Soc. Precis. Eng., Vol. 26, No. 11, pp. 108-115, 2009.
  9. Kubli, W. and Reissner, J., "Optimization of Sheet-Metal Forming Processes Using the Special-Purpose Program Autoform," Journal of Materials Processing Technology, Vol. 50, No. 1, pp. 292-305, 1995. https://doi.org/10.1016/0924-0136(94)01390-M
  10. Stoughton, T. B. and Zhu, X., "Review of Theoretical Models of the Strain-Based FLD and Their Relevance to the Stress-Based FLD," International Journal of Plasticity, Vol. 20, No. 8, pp. 1463-1486, 2004. https://doi.org/10.1016/j.ijplas.2003.11.004
  11. Kubli, W. and Sester, M., "Forming Limit Strain Analysis," US Patent, No. 7870792 B2, 2008.
  12. Stoughton, T. B. and Yoon, J. W., "Path Independent Forming Limits in Strain and Stress Spaces," International Journal of Solids and Structures, Vol. 49, No. 25, pp. 3616-3625, 2012. https://doi.org/10.1016/j.ijsolstr.2012.08.004
  13. AutoForm Engineering GmbH, "AutoForm R3.1 Incremental Manual," 2015.
  14. Kitayama, S., Kita, K., and Yamazaki, K., "Optimization of Variable Blank Holder Force Trajectory via Sequential Approximate Optimization with Radial Basis Function Network," Proc. of the 10th World Congress on Structural and Multidisciplinary Optimization, 2013.