Abstract
Profile and shape control are required to assure the dimensional quality of rolled strip. Occurrence of waves either at the edges or centre of strips is attributed to inconsistency between the entry and exit cross-section profiles of the stock within a given rolling pass. The exit profile of the strip can be computed by considering that the such profile is the complement of that of the roll-gap, which is affected by wear, thermal expansion and distortion of the work rolls A computer model was developed to predict the profile of the roll-gap taking into account the thermal gradient within the work roll and the distortion caused by the acting forces. It was possible to establish a good correlation between the profiles of strips obtained from trials carried out on site, and the predictions of the model. The model allows for the prediction of the onset of shape defects from changes in the profile of rolled strips.
Highlights
The ability to produce consistent material is important to producers and consumers of steel goods
The rolling loads cause elastic flattening of the rolls, as well as elastic distortion of work and backup rolls[1,2,3], figure 1. Shape defects such as the occurrence of waves either at the edges or centre of the strip will result by rolling of incompatible ingoing and outgoing profiles
The relationship among the various parameters and variables involved in hot rolling of steel strip is complex
Summary
The ability to produce consistent material is important to producers and consumers of steel goods. Geometrical or dimensional control of rolled strips has become more important as the industry that consumes these goods change from manual control to highly automated systems In this case, highly waved or cambered material might cause harm to people, damage to equipment or retard production as it clogs machines and comes out of trajectory. The rolling loads cause elastic flattening of the rolls, as well as elastic distortion of work and backup rolls[1,2,3], figure 1 Shape defects such as the occurrence of waves either at the edges or centre of the strip will result by rolling of incompatible ingoing and outgoing profiles. The model considers that the outgoing profile is the complement of the roll-gap profile, which is affected by the superposition of thermal and mechanical effects
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