Hot Plates

Optimization-based reduction of contour errors of heavy plates in hot rolling

This paper deals with the reduction of top view contour errors in the hot rolling process. Deviations between the actual plate contour and the desired shape may result from asymmetric rolling conditions caused by, e.g., temperature gradients or non-homogeneous input thickness profiles. Under real rolling conditions these disturbances are hard to predict and hence cannot be compensated in a feed...

An Analytical Approach for Modelling Asymmetrical Hot Rolling of Heavy Plates

Optimization-based estimator for the contour and movement of heavy plates in hot rolling

This paper deals with the estimation of the contour of heavy plates during the hot rolling process. Asymmetric rolling conditions lead to a non-rectangular contour. The reasons for this effect, e.g., temperature gradients or nonhomogeneous input thickness profiles, are hard to predict in a real rolling mill. Hence, feedforward compensation of these disturbances is difficult, whereas feedback co...

Application of bandelet transform to surface defect recognition of hot rolled steel plates

Surface defects are important factors to surface quality of steel plates. The detection and recognition of surface defects can provide effective information for production optimization. There are several types of surface defects on hot rolled steel plates which are covered by lots of scales. The purpose of this paper is to recognize eight kinds of typical surface defects from scales. Bandelet t...

Product and hot rolling process development of NV 40 steel plates 1

The Companhia Siderúrgica Paulista – COSIPA is an integrated steel plant of the Usiminas System located in the municipality of Cubatão, in the coastal region of the São Paulo state, Brazil. This works produces 4.5 millions tons of steel per year; 1.0 million tons of this output are delivered as rolled plates, which meet a wide range of uses, such as those in agricultural implements, industrial ...