Forming parts over small radii

10th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes

Hazra, S.K.^1 ; Hughes, D.J.^1 ; Pereira, M.P.^2 ; Rolfe, B.F.^2

WMG, University of Warwick, Coventry

CV4 7AL, United Kingdom^1

School of Engineering, Deakin University, Australia^2

关键词: Channel sections;    Cosmetic defects;    Out-of-plane stress;    Residual strains;    Sheet thickness;    Simplifying assumptions;    Stamping simulations;    Transient stress;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/734/3/032096/pdf
DOI  :  10.1088/1742-6596/734/3/032096

来源: IOP

【 摘 要 】

Stamping simulations usually make the plane stress simplifying assumption. However, this becomes less valid when material draws around features with radius to sheet thickness ratios less than 20. Pereira, Yan & Rolfe (Wear, Vol.265, p.1687 (2008)) predicted that out-of-plane stress equivalent to material yield can occur because a line contact forms briefly at the start of the draw process. The high transient stress can cause high rates of tool wear and may cause the 'die impact line' cosmetic defect. In this work, we present residual strain results of a channel section that was drawn over a small radius. Using the neutron source at the Institut Laue-Langevin, in-plane and out-of-plane strains were measured in the channel part to show some support for the conclusions of Pereira et. al.