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Title: An investigation into the influence of asymmetrical rolling on operations and strip shape during the roughing stages of a hot strip mill
Author: Knight, C. W.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2003
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Abstract:
Asymmetrical conditions occurring during the rolling of hot strip can cause strip curvature and can lead to poor product shape, profile, quality and cause reduced productivity. In the most severe of cases, strip with a head-end turning towards the upper work roll, may fail to enter the roll gap on its next pass and result in ‘a cobble’. Finite element techniques have been used to decouple some of the major causes of strip curvature during the roughing stages of Port Talbot hot strip mill. A plane strain elastic-plastic finite element model is developed and applied to predict the direction and severity of strip curvature caused by asymmetrical factors at each pass of the rougher. Asymmetrical factors considered include work roll speed mismatch, temperature differentials across the thickness of the workpiece, pass height and differential frictional differences between upper and lower work-rolls. In addition, further studies utilising the rolling model have identified the influence of rolling parameters on the severity and direction of strip curvature. The rolling parameters include initial strip height, rolling reduction, mean coefficient of friction, mean roll speed and workpiece temperature. Two experimental factorials were designed and performed, using finite element predictions, to identify which asymmetrical factors were most influential to strip curvature and to determine, if any, interactions between asymmetrical factors and rolling parameters. Furthermore, trials were carried out on the reversing rougher of Corus Port Talbot hot strip mill to investigate the effectiveness of roll speed mismatch as a means of controlling strip curvature.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Eng.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.637811  DOI: Not available
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