Definition
In accordance to DIN 8586 (2003) “Manufacturing processes forming by bending – classification, subdivision, terms and definitions,” roll levelling is classified as a bending process using rotating tool motion.
In more technological and industrial terms, roll levelling is the process where a sheet having flatness defects is straightened by imparting alternating bending operations using a set of bending rolls. The objective of the process is to minimize flatness imperfections and to level internal residual stresses of the material (Schuler 1998).
Theory and Application
Flatness Defects
During the hot and cold rolling of coils, work rolls are subjected to bending moments that produce heterogeneous plastic strains and thicknesses along the width of the sheet. As a consequence, different fiber lengths are generated, and diverse shape defects appear in the resulting coils. Furthermore,...
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References
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DIN 8586 (2003) Manufacturing processes forming by bending - classification, subdivision, terms and definitions. Beuth, Berlin
DIN EN 10131 (2006) Cold rolled uncoated and zinc or zinc-nickel electrolytically coated low carbon and high yield strength steel flat products for cold forming - tolerances on dimensions and shape; German version EN 10131:2006. Beuth, Berlin
DIN EN 10051 (2010) Continuously hot-rolled strip and plate/sheet cut from wide strip of non-alloy and alloy steels – tolerances on dimensions and shape; German version EN 10051:2010. Beuth, Berlin
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Galdos, L., Silvestre, E. (2018). Roll Levelling. In: The International Academy for Production (eds) CIRP Encyclopedia of Production Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35950-7_16844-1
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DOI: https://doi.org/10.1007/978-3-642-35950-7_16844-1
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