Finite-Element Analysis of the Three-Stage Cold Extrusion of Steel Cups

Three-stage cold extrusion of 1017 steel cups involves hobbing, backward extrusion and ironing. Computational finite-element meshes are defined: in the first stage, a unique mesh is used; in the second stage, the mesh is R-refined with an adaptative geometric procedure; in the third stage, the initi...

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Bibliographic Details
Published in:Journal of materials processing technology 1990-09, Vol.31 (1-2), p.27-37
Main Authors: Prikazsky, J M, Hrycaj, P, Picart, P, Oudin, J, Lochegnies, D, Ravalard, Y
Format: Article
Language:English
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Summary:Three-stage cold extrusion of 1017 steel cups involves hobbing, backward extrusion and ironing. Computational finite-element meshes are defined: in the first stage, a unique mesh is used; in the second stage, the mesh is R-refined with an adaptative geometric procedure; in the third stage, the initial mesh is redesigned. An updated Lagrangian scheme is achieved with isotropic bulk elastic--plastic constitutive equations. A consistent tangent operator is calculated. Effective strain and hydrostatic stress, computed with the non-linear code AstriD, are shown for the hobbing and backward extrusion of 1017 soft annealed and zinc phosphate/sodium stearate coated workpieces. Punch load, loss of contact and height variation are given for the last ironing stage, batch production experiments agreeing very well with these predictions.
ISSN:0924-0136