Considering the stiffness of the forming tools in the numerical analysis of the ironing process
OLIVEIRA Marta C., NETO Diogo M., ALVES José L., MENEZES Luís F.download PDF
Abstract. Ironing can occur in cylindrical cup drawing whenever the thickness of the drawn flange is larger than the gap between the punch and the die. This is particularly relevant for materials that present r-values lower than 1.0, such as the aluminium alloys, since they tend to present more thickening of the flange. The aim of this study is to evaluate numerically the impact of the elastic deformation of the forming tools on the final cup geometry, i.e., the earing profile and the evolution of thickness along the circumferential direction, at different heights. Different contact conditions are also analysed since they strongly affect both the thickness strain and the earing profile. The process conditions considered are the ones from EXACT, the ESAFORM Benchmark 2021, enabling the comparison with experimental results. Considering the deformation of the forming tools mainly impacts the ironing stage, enabling predicting wall thickness values larger than the gap between the punch and the die.
Sheet Metal Forming, Ironing Stage, Deformable Tools, Numerical Analysis
Published online 4/19/2023, 10 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: OLIVEIRA Marta C., NETO Diogo M., ALVES José L., MENEZES Luís F., Considering the stiffness of the forming tools in the numerical analysis of the ironing process, Materials Research Proceedings, Vol. 28, pp 1481-1490, 2023
The article was published as article 160 of the book Material Forming
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 M. Burkart, P. Essig, M. Liewald, M. Beck, M. Mueller, Compensation of elastic die and press deformations during sheet metal forming by optimizing blank holder design, in: IOP Conf Ser Mater Sci Eng, IOP Publishing Ltd, 2020. https://doi.org/10.1088/1757-899X/967/1/012074.
 R. Lingbeek, Virtual tool reworking new strategies in die design using finite element forming simulations, PhD Thesis, University of Twente (2008).
 J. Pilthammar, M. Sigvant, S. Kao-Walter, Introduction of elastic die deformations in sheet metal forming simulations, Int. J. Solids Struct. 151 (2018) 76-90. https://doi.org/10.1016/j.ijsolstr.2017.05.009
 F. Abbasi, A. Sarasua, J. Trinidad, N. Otegi, E. Saenz de Argandoña, L. Galdos, Substitutive press‐bolster and press‐ram models for the virtual estimation of stamping‐tool cambering, Materials. 15 (2022). https://doi.org/10.3390/ma15010279
 A.M. Habraken, T.A. Aksen, J.L. Alves, R.L. Amaral, E. Betaieb, N. Chandola, L. Corallo, D.J. Cruz, L. Duchêne, B. Engel, E. Esener, M. Firat, P. Frohn-Sörensen, J. Galán-López, H. Ghiabakloo, L.A.I. Kestens, J. Lian, R. Lingam, W. Liu, J. Ma, L.F. Menezes, T. Nguyen-Minh, S.S. Miranda, D.M. Neto, A.F.G. Pereira, P.A. Prates, J. Reuter, B. Revil-Baudard, C. Rojas-Ulloa, B. Sener, F. Shen, A. van Bael, P. Verleysen, F. Barlat, O. Cazacu, T. Kuwabara, A. Lopes, M.C. Oliveira, A.D. Santos, G. Vincze, Analysis of ESAFORM 2021 cup drawing benchmark of an Al alloy, critical factors for accuracy and efficiency of FE simulations, Int. J. Mater. Forming 15 (2022) 1-96. https://doi.org/10.1007/s12289-022-01672-w
 D.M. Neto, J. Coër, M.C. Oliveira, J.L. Alves, P.Y. Manach, L.F. Menezes, Numerical analysis on the elastic deformation of the tools in sheet metal forming processes, Int. J. Solids Struct. 100 (2016) 270-285. https://doi.org/10.1016/j.ijsolstr.2016.08.023
 L.F. Menezes, C. Teodosiu, Three-dimensional numerical simulation of the deep-drawing process using solid finite elements, J. Mater. Process. Technol. 97 (2000) 100-106. https://doi.org/10.1016/S0924-0136(99)00345-3
 J. Coër, H. Laurent, M.C. Oliveira, P.Y. Manach, L.F. Menezes, Detailed experimental and numerical analysis of a cylindrical cup deep drawing: Pros and cons of using solid-shell elements, Int. J. Mater. Forming 11 (2018) 357-373. https://doi.org/10.1007/S12289-017-1357-4/FIGURES/21
 D.M. Neto, M.C. Oliveira, L.F. Menezes, J.L. Alves, Applying Nagata patches to smooth discretized surfaces used in 3D frictional contact problems, Comput. Methods Appl. Mech. Eng. 271 (2014). https://doi.org/10.1016/j.cma.2013.12.008
 O. Cazacu, F. Barlat, Generalization of Drucker’s yield criterion to orthotropy, Math. Mech. Solids 6 (2001) 613-630. https://doi.org/10.1177/108128650100600603
 D.M. Neto, M.C. Oliveira, R.E. Dick, J.L. Alves, L.F. Menezes, Non-Uniform Effect of the Contact Conditions on the Earing Profile in Cylindrical Cups of Anisotropic Materials, Key Eng. Mater. 926 (2022) 1188-1194. https://doi.org/10.4028/p-9i8j3o