from the conferences organized by TANGER Ltd.
With increasing interest in lightweight construction and cost-efficient sheet production methods, the twin roll casting of non-ferrous metals is constantly developing, due to the combination of several different process steps into one process. However, its challenge is the impossibility of direct recording of important process parameters such as temperature and pressure distribution in the rolling gap, in order to control product properties, due to the difficult process conditions. This article will discuss asolution to transform the twin roll casting process into a process that can controls product properties using a softsensor with additional inline measurements for temperature and pressure at the surface of the work rolls and a digital twin. The digital twin is used to predict correlations between the entities at the roll surface and the material properties in the bulk of the strip. The model used in this article is an extension of the layer model proposed by Schmidtchen and Kawalla based on the classical elementary theory of plasticity, which aimed to model the heterogeneous deformation behavior during flat rolling. Its great advantage compared to other simulation methods is a much lower computational effort. The actual extension as casting-rolling tool as proposed by Weiner et al. combines a viscous and a solid region for each layer in one tool. Experimental results were obtained that allows the direct correlation between the shape of temperature distributions and the length of the fully solidified part Ld within the roll-casting zone. This length correlates directly to the effective total equivalent strain. The static recrystallization in a subsequent heat treatment process is improved and results in a better formability of the magnesium strip with increasing strain.
Keywords: Twin roll casting, layer model, rolling, soft sensor, digital twin© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.