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
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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