Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Finite element analysis of roughness transfer analysis: modelling for temper rolling process
Submission Author:
Yukio Shigaki , MG
Co-Authors:
Yukio Shigaki, Paulo Dutra, Marllon Cézar, Arthur Farias Neiva, Rafael Narciso Mendes Alvarenga Romie
Presenter: Yukio Shigaki
doi://10.26678/ABCM.COBEM2021.COB2021-1969
Abstract
Automotive industry demands steel strips with high peak density to get good surface finish after painting and, at the same time, be good for stamping. Find a way to predict if the final strip has these qualities is of fundamental matter. This roughness transfer is usually done at the final flat cold rolling process called temper rolling. This finishing process aims at correcting small bad flatness, cut out the initial yield stress instability and applying a desired roughness to the strip. Many authors have studied the roughness transfer mechanism [Legrand et al., 2019; Kijima, 2015], but none of them have analyzed it more deeply modelling asperity itself on the surfaces geometrically for a finite element model. The interaction of both surfaces – work roll and strip surfaces – is very complex, considering the crushing and ploughing mechanisms, the high roll deformation, the sliding and sticking friction in the roll/strip contact surface, etc. The first step towards a sound finite element model for this study must work on the precise modelling of the asperities on the contacting surfaces. Due to the huge size differences between the roll diameter (something around 500 mm) and surface roughness (micrometers), roughness modelling is not so straightforward. Simultaneously, a finite element model for the temper rolling process was developed, showing an arc-of-contact with 5 distinct regions: on the entering part there is an elastic deformation, followed by a plastic one, and in the middle a plastic contained region (where apparently there is no thickness reduction), and then a plastic and finally an elastic deformation to the exit of the strip. It shows that the highest thickness reduction occurs at this last part. This work includes a step-by-step guide on how to model roughness on the strip and roll surfaces using a Python code, and its results are implemented on the temper rolling finite element model. We aim at better understand the roughness behavior in the contacting interface, and verify the crushing and ploughing of peaks inside the arc-of-contact, and calculate the exit strip roughness. Kijima, H. An experimental investigation on the influence of lubrication on roughness transfer in skin-pass rolling steel strip, Journal of Materials Processing Technology, 225, pp. 1-8, 2015 Legrand, N.; Counhaye, C.; Souto, N.; Earley, D.; Szidon, M. Roughness transfer model based on the Monte Carlo Method: application to steel sheet temper rolling, 11th International Rolling Conference, October 1-3, São Paulo, Brazil, 2019
Keywords
Roughness transfer, Finite Element Method, temper rolling, skin pass
