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Title

FE-BASED SENSITIVITY ANALYSIS OF FLATNESS IN HOT HEAVY PLATE LEVELING

Authorship

Laugwitz, Marvin; Jochum, Martin; Scheffer, Tobias; Wild, Daniel; Hirt, Gerhard; Lohmar, Johannes

Laugwitz, Marvin

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Jochum, Martin

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Scheffer, Tobias

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Wild, Daniel

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Hirt, Gerhard

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Lohmar, Johannes

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DOI

10.5151/9785-9785-32259

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Abstract

Leveling is a standard process in the rolling mill to eliminate flatness deviations. The process layout is based on models and the leveling result depends on the accuracy of the material parameters in these models. Even small deviations from the correct assumptions can have a major effect on the final flatness. Thus, after leveling the products may look optically flat, but subsequent to a final cutting process springback occurs due to residual stresses. The objective of this work is to analyze the influence of material parameters and gravity on the flatness after leveling. To evaluate the sensitivity of the process, an FE parameter study is exerted that reveals the influence of fluctuations in material properties in the case that the leveling setup is fixed. Gravity is neglected to not conceal flatness deviations. Examples of this study are rerun in a further step under consideration of gravity to also analyze its influence on the resulting flatness and residual stresses. Finally, to analyze the consequence of the residual stresses, all information of the plate from the previous step are transferred while gravity is suppressed to prompt springback. This study revealed that slight deviations of the material properties can lead to uneven plates in simulations where gravity is not considered. If gravity is taken into account, the unevenness is concealed and the plate seems flat. A springback simulation of the same plate shows that strong residual stresses are still present and would lead to unevenness if e.g. the plate were cut.

Keywords

Hot heavy plate leveling; Finite Element Methods; Springback