Flatness defects in thin strip cold rolling and the friction impact on it

Rebecca Nakhoul (1) , Pierre Montmitonnet (1) , Sami Abdelkhalek (2)

1 CEMEF - Centre de Mise en Forme des Matériaux
2 Research and Development Industrial operations

Flatness defects are one of the major problems in strip rolling. They are manifested by a wavy shape on the edge, in the centre or in between. Waves are most of the time transverse, but all directions can be observed. These defects come from the heterogeneity of the stress field and the resulting buckling of the compressive areas out of the roll bite. This paper is based on the approach proposed by [1-3] and [4], and programmed previously [5-7] in the FEM software LAM3/TEC3 [8]. In the present paper, the latter is enhanced and applied to the impact of friction and strip tension on flatness of a rolled thin strip. The study shows e.g. that the optimal setting of Work Roll Bending force (WRB) should be changed when friction varies.

Mots clés: Finite element method; Flatness defect; Friction; Rolling; Thin strips

Domaines: Matériaux

Rebecca Nakhoul, Pierre Montmitonnet, Sami Abdelkhalek. Flatness defects in thin strip cold rolling and the friction impact on it. 40th Annual North American Manufacturing Research Conference, NAMRC40, Jun 2012, Notre-Dame, Indiana, United States. pp.277-286 - TP12PUB71 - ISBN 978-162276247. ⟨hal-00761770⟩