Advertisement

Springer Nature is making SARS-CoV-2 and COVID-19 research free. View research | View latest news | Sign up for updates

Deep drawing of rectangle parts using variable blank holder force

Abstract

When deep drawing rectangle parts, instead of adopting elastic or several segmented blank holders, a new thought of applying dual layers of blank holders, which are parallel to each other, has been achieved to asynchronously vary blank holder force (BHF) at different regions of sheet flange, by dint of replacing different little mandrils in length between dual layers of blank holders, thus to further improve the formability of products. At the same time, in order to solve two problems of how to judge which one distribution of one desired integral variable BHF, which was obtained from the thickness analyses with products in advance, on blank holder for asymmetric parts is the best and to evaluate lubricant in deep drawing, a probe sensor with structure of dual cantalevers, based on the theory of resistance strain slice, fixed into the inner space of die, was developed for measuring real-time friction coefficient of sheet flange’s surface. Through this special probe sensor, not only real-time BHF on sheet flange could be measured out, but also the real-time friction coefficient could be figured out. Finally, one example of rectangle part was carried out in tests to validate the feasibility of this thought. By the way of analyzing the distribution of variation with products’ thickness on products and judging whether the whole distribution of friction on sheet flange’s surface was uniform or not, one optimized BHF loading profile could be finally obtained over the whole punch stroke.

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

References

  1. 1.

    Wang J, Wu X, et al. (2000) A neural networks approach to investigating the geometrical influence on wrinkling in sheet metal forming. J Mater Process Technol 105:215–220

  2. 2.

    Gunnarsson L, Asnafi N, et al. (1998) In-process control of blank holder force in axi-symmetric deep drawing with degressive gas springs. J Mater Process Technol 73:89–96

  3. 3.

    Shulkin LB, Posteraro RA, et al. (2000) Blank holder force (BHF) control in viscous pressure forming (VPF) of sheet metal. J Mater Process Technol 98:7–16

  4. 4.

    Gunnarsson L, Schedin E (2001) Improving the properties of exterior body panels in automobiles using variable blank holder force. J Mater Process Technol 114:168–173

  5. 5.

    Hassan MA, Takakura N, et al. (2003) Friction aided deep drawing using newly developed blank-holder diveded into eight segments. Int J Mach Tools Manuf 43:637–646

  6. 6.

    Shulkin L, Jansen SW, et al. (1996) Elastic deflections of the blank holder in deep drawing of sheet metal. J Mater Process Technol 59:34–40

  7. 7.

    Hardt DE, Boyoe MC, et al. (1992) Enhanced sheet forming using real-time control of blank holder force. In: Proc Sheet Metal 1992, Bristol, UK, pp 249–258

  8. 8.

    Ming-zhe L, Wen-zhi F, Xiang-ji L, Xue-ping Y (2000) Development of a multi-point plate forming machine. J Harbin Inst Technol 32:62–64

  9. 9.

    Sheng ZQ, Jirathearanat S, Altan T (2004) Adaptive FEM simulation for prediction of variable blank holder force in conical cup drawing. Int J Mach Tools Manuf 44:487–494

Download references

Author information

Correspondence to Zhu Wei.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Wei, Z., Zhang, Z. & Dong, X. Deep drawing of rectangle parts using variable blank holder force. Int J Adv Manuf Technol 29, 885–889 (2006). https://doi.org/10.1007/s00170-005-2578-0

Download citation

Keywords

  • BHF
  • Deep drawing
  • Dual layers of blank holders
  • Friction coefficient
  • Probe sensor
  • Rectangle parts
  • Thickness