Deformation behavior of saddle surface part during multi-point forming under normally full constraint condition

  • Bin-Bin JiaEmail author
  • Wei-Wei Wang
  • ShiJian Yuan


In order to solve the problem of wrinkling in traditional multi-point forming (MPF), a new multi-point forming process, namely multi-point forming with individually controlled force-displacement (MPF-ICFD), was proposed. The core idea of this process is to impose a full-area normal constraint on the sheet metal during the whole forming process. Therefore, the deformation sequence of the sheet metal is changed from the local constraint and the whole deformation in the traditional MPF to the whole constraint and the local deformation so as to completely eliminate the noncontact region and avoid wrinkling. In this paper, the saddle surface part was taken as the research object. The influence of normal restraint on critical wrinkle stress is studied by mechanical analysis, and the wrinkle restraint mechanism under normal restraint is revealed. The deformation behavior of saddle surface parts was studied by forming experiments, and the wrinkling law of saddle surface parts under different constraints is obtained. The deformation characteristics of saddle surface parts were analyzed by numerical simulation, and the critical stress distribution rules of the sheet metal were given. It is shown that the critical wrinkling stress of the sheet metal is significantly increased in MPF-ICFD compared with that in traditional MPF, and the increased value is proportional to the magnitude of normal constrained force. Besides, the wrinkling phenomenon of saddle surface parts is significantly suppressed, and the surface quality of workpiece is obviously improved. In addition, the stress state change from compressive stress to tensile stress in the core region of the sheet metal was prone to wrinkle.


Multi-point forming Normal constraint Wrinkling Saddle surface part 


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Funding information

This research is supported by the National Natural Science Foundation of China (No. 51505103, No. 51175109).


  1. 1.
    Heo SC, Seo YH, Ku TW, Kang BS (2010) A study on thick plate forming using flexible forming process and its application to a simply curved plate. Int J Adv Manuf Technol 51(1–4):103–115CrossRefGoogle Scholar
  2. 2.
    Wang XY, Jin JS, Deng L (2017) Review: state of the art of stamping forging process with sheet metal blank. J Harbin Inst Technol 24(3):1–16Google Scholar
  3. 3.
    Hatipoğlu HA, Alkaş CO (2016) Process modelling and die design concepts for forming aircraft sheet parts. J Phys Conf Ser:1–4Google Scholar
  4. 4.
    Zhang FF, He K, Dang XB, Du RX (2018) Experimental and numerical study on one flexible incremental bending process. Int J Adv Manuf Technol 96(5–8):2643–2655CrossRefGoogle Scholar
  5. 5.
    Selmi N, Belhadjsalah H (2017) Ability of the flexible hydroforming using segmented tool. Int J Adv Manuf Technol 89:1431–1442CrossRefGoogle Scholar
  6. 6.
    Peng JW, Li WD, Han JQ, Wan M, Meng B (2016) Kinetic locus design for longitudinal stretch forming of aircraft skin components. Int J Adv Manuf Technol 86(9–12):1–12Google Scholar
  7. 7.
    Wu ZH, Du JW, Zhu MH, Fan XM (2017) Survey on flexible shipbuilding technologies for curved ship-blocks. Procedia Eng 174:800–807CrossRefGoogle Scholar
  8. 8.
    Zareh DB, Davoodi B, Vedaei SA (2015) Investigation of deep drawing concept of multi-point forming process in terms of prevalent defects. Int J Mater Form:1–11Google Scholar
  9. 9.
    Belykh S, Krivenok A, Bormotin K, Stankevich A, Krupskiy R, Mishagin V, Burenin A. Numerical and experimental study of multi-point forming of thick double curvature plates from aluminum alloy 7075. IV Sino Russian ASRTU Symposium on Advanced Materials and Processing Technology, 2016: 17–23Google Scholar
  10. 10.
    Toopkanloo R, Kaffash MM, Ghorbani M (2016) Assessment of forming parameters effects on quality of the multi point forming process of ST-AH32. National Conference on Mechanical Engineering and Industrial Solutions:60–66Google Scholar
  11. 11.
    Qu EH, Li MZ, Li R, Cui MY, Lin JL (2018) Research on formability in multi-point forming with different elastic pads. Int J Adv Manuf Technol 98:1887–1901CrossRefGoogle Scholar
  12. 12.
    Liang XB, Cai ZY, Zhang X (2018) Forming characteristics analysis and springback prediction of bi-directional trapezoidal sandwich panels in the multi-point bend-forming. Int J Adv Manuf Technol 98:1709–1720CrossRefGoogle Scholar
  13. 13.
    Abebe M, Lee K, Kang BS (2016) Surrogate-based multi-point forming process optimization for dimpling and wrinkling reduction. Int J Adv Manuf Technol 85(1–4):391–403CrossRefGoogle Scholar
  14. 14.
    Liu Y, Li M, Ju F (2016) Research on the process of flexible blank holder in multi-point forming for spherical surface parts. Int J Adv Manuf Technol 89:2315–2322CrossRefGoogle Scholar
  15. 15.
    Qu E, Li M, Li R, Zhao L, Zhuo Y (2017) Inhibitory effects of a flexible steel pad on wrinkling in multi-point die forming. Int J Adv Manuf Technol 10:1–8Google Scholar
  16. 16.
    Abosaf M, Essa K, Alghawail A, Tolipov A, Su SZ, Pham D (2017) Optimisation of multi-point forming process parameters. Int J Adv Manuf Technol 92(6):1849–1859CrossRefGoogle Scholar
  17. 17.
    Zhang Q, Wang ZR, Dean TA (2008) The mechanics of multi-point sandwich forming. Int J Mach Tools Manuf 48(12–13):1495–1503CrossRefGoogle Scholar
  18. 18.
    Song AP, Wu WW, Zhang J (2010) A reconfigurable stamping die and its stamping process. J Shanghai Jiaotong Univ 15(3):313–318CrossRefGoogle Scholar
  19. 19.
    Luo YX, Yang WM, Liu ZF, Wang YQ, Du RX (2016) Numerical simulation and experimental study on cyclic multi-point incremental forming process. Int J Adv Manuf Technol 85(5–8):1249–1259CrossRefGoogle Scholar
  20. 20.
    Jia BB, Wang WW (2017) New process of multi-point forming with individually controlled force-displacement and mechanism of inhibiting springback. Int J Adv Manuf Technol 90:3801–3810CrossRefGoogle Scholar

Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  1. 1.Harbin Institute of Technology, School of materials science and engineeringHarbinChina
  2. 2.Harbin Institute of Technology at Weihai, School of materials science and engineeringWeihaiChina

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