Alexander Kainz, Markus Widder, Erik Parteder, Gerald Hein, Karl Schörkhuber, Klaus Zeman,
"An enhanced iterative algorithm for the contact between elastic roll stack and elasto-viscoplastic strip and plate in hot rolling"
, in Gerhard Hirt, A. Erman Tekkaya, in Steel Research International, Vol. Special Edition ICTP 2011, Wiley-VCH Verlag GmbH & Co. KGaA. Weinheim, Seite(n) 131-136, 9-2011, ISBN: 978-3-514-00784-0, ISSN: 1611-3683
An enhanced iterative algorithm for the contact between elastic roll stack and elasto-viscoplastic strip and plate in hot rolling
Sprache des Titels:
The accurate and reliable prediction of lateral flow (spread) of the rolled material in flat hot strip and plate rolling enables the pre-calculation of strip profile (thickness over width), relative strip crown changes, and of profile transfer functions. Especially for thin, wide strips and plates, where the aspect ratio width over thickness is extremely unfavourable for standard Finite Element (FE) - calculations, the determination of profile transfer and flatness obviously leads to extremely high calculation times with commercial FE-software. Therefore, special emphasis was put on the systematic development of customized FE-codes for the efficient simulation of the elasto-viscoplastic material flow inside the roll gap. The underlying formalism for the strip-routines is based on pseudo-steady-state streamline-update tech-niques for the stress-field, coupled iteratively with the principle of virtual power for the determination of the velocity field and the contact stress distribution between strip and work roll. Due to the high non-linearity of the whole problem, the coupling between roll stack and rolled stock is performed iteratively. The model is well suited for systematic parameter studies to investigate material flow and flatness defects in more detail and to develop enhanced flatness criteria for flat hot strip and plate rolling.