Precision online model for prediction of strip temperature in hot strip rolling

Abstract

Investigated via a series of finite element (FE) process simulation is the effect of diverse process variables on some selected non-dimensional parameters characterising the thermomechanical behaviour of the roll and strip in hot strip rolling. Then, on the basis of these parameters, online models are derived for precise prediction of the temperature changes occurring in the bite zone as well as in the interstand zone in a finishing mill. The prediction accuracy of the proposed models is examined through comparison with predictions from a FE process model.

An analytical model for the prediction of the transfer bar temperature in a roughing mill

“…8 The average heat generation occurring in a particle flowing though the bite zone may approximately be given by where y9 denotes the normalised distance from the centreline, with y951 representing the surface, and the integration is performed along the streamline y95constant. By examining the actual distribution of : q y' ð Þ predicted from the FE simulation, which is illustrated in Figs.…”

“…Details regarding the process model and its solution accuracy are given elsewhere. 8 The predicted temperature distribution in the strip as well as in the roll is illustrated in Fig. 2.…”

“…An approximate model which is used for the prediction of P d , P f and P r in the present investigation is given elsewhere. 8 The average heat generation occurring in a particle flowing though the bite zone may approximately be given by : q y' ð Þ~Ð where y9 denotes the normalised distance from the centreline, with y951 representing the surface, and the integration is performed along the streamline y95constant.…”

“…8 (ii) calculate q s from equation (22) (iii) calculate P d from the mathematical expressions derived by Lee et al 8 and A from equation (21) (iv) calculate heat generation, from equation (19) (v) calculate the temperature distribution, from equation (28).…”

Prediction of Temperature of Hot Strip in Finishing Mill

“…Madakasira Prabhakar Phaniraj et al used semi-empirical method for recrystallization and particle growth, conducted a simulation using common programs, and explained the deformation and load of strip and the changes in the diameter and temperature of rolling during a finishing mill process [4]. To improve finite elements method which too much time and expense is required to apply to an actual production process, J. H. Lee et al configured On-Line model to ensure the accuracy of calculation and to reduce the time of interpretation using least square method and dimensional analysis [5].…”