Comprehensive contour prediction model of work roll used in online strip shape control model during hot rolling

Abstract Initial, thermal and wear contours of the work roll are three major sources of mill disturbance and play critical roles in crown and shape control of strip. To simplify the complex contour curve of the work roll resulting from superposition of three kinds of contour mentioned above in the online strip shape control model, a comprehensive contour concept of the work roll and its predictive calculation model are put forward in the present work. Predictive calculation of the comprehensive contour of the work roll in the online strip shape control model during hot rolling consists of two important parts, namely wear contour calculation and thermal contour calculation, which have a direct influence on the accuracy of shape control. A statistical wear model and a finite difference thermal contour model of the work roll are described in the present work. The comprehensive contour is the sum of grinding, wear and thermal contours. This comprehensive contour calculation model has been applied successfully in a real online strip shape control model. Its high precision has been proved through the large amounts of actual roll profile measurement and theoretical analysis. The hit rates (per cent of shape index satisfying requirement) of crown and head flatness of the strips rolled by using the shape control model, which includes the comprehensive contour calculation model, have increased about 16 and 10% respectively, compared with that of strips rolled using manual operation.

[1]  Siamak Serajzadeh,et al.  Unsteady state work-roll temperature distribution during continuous hot slab rolling , 2002 .

[2]  Zone-Ching Lin,et al.  Three-dimensional heat-transfer and thermal-expansion analysis of the work roll during rolling , 1995 .

[3]  Bernd Reusch.  Computational Intelligence, Theory and Applications , 1997 .

[4]  Kevin Barraclough,et al.  I and i , 2001, BMJ : British Medical Journal.

[5]  Miroslav Raudensky,et al.  Optimal cooling of rolls in hot rolling , 2002 .

[6]  Cheng-Hung Huang,et al.  The estimation of surface thermal behavior of the working roll in hot rolling process , 1995 .

[7]  Julian M. Allwood,et al.  Fast model of thermal camber evolution in metal rolling for online use , 1999 .

[8]  Thermal expansion and crown evaluations in rolling processes , 1996 .

[9]  Martha Guerrero,et al.  Modelling heat transfer in hot rolling work rolls , 1999 .

[10]  Cheng-I Weng,et al.  Heat transfer evaluation of impingement cooling in hot rolling of shaped steels , 1994 .

[11]  C. G. Sun,et al.  Prediction of Roll Thermal Profile in Hot Strip Rolling by the Finite Element Method , 2000 .

[12]  A. Molinari,et al.  Tribological behaviour of hot rolling rolls , 2005 .

[13]  R. Fuentes,et al.  Computer simulation of the thermal behaviour of a work roll during hot rolling of steel strip , 2004 .

[14]  Der-Form Chang,et al.  Thermal stresses in work rolls during the rolling of metal strip , 1999 .

[15]  Remn-Min Guo,et al.  Development of an optimal crown/shape level-2 control model for rolling mills with multiple control devices , 1998, IEEE Trans. Control. Syst. Technol..

[16]  Lars Nolle,et al.  Optimum Work Roll Profile Selection in the Hot Rolling of Wide Steel Strip Using Computational Intelligence , 1999, Fuzzy Days.

[17]  Rafael Colás,et al.  Damage in hot rolling work rolls , 1999 .

[18]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[19]  Vladimir B. Ginzburg,et al.  High-Quality Steel Rolling: Theory and Practice , 1993 .

[20]  P. Reiser,et al.  Genetic algorithms in engineering systems: innovations and applications , 1996 .

[21]  C. Yun,et al.  Investigation of thermomechanical behavior of a work roll and of roll life in hot strip rolling , 1998 .

[22]  Franz Dieter Fischer,et al.  The temperature and stress fields developing in rolls during hot rolling , 2004 .

[23]  Lars Nolle.  Development of an intelligent roll profile optimizing system [poster presentation] , 1995 .

[24]  Ahmad Saboonchi,et al.  Changing the geometry of water spray on milling work roll and its effect on work roll temperature , 2004 .

[25]  Anh Kiet Tieu,et al.  Numerical modelling of the thermal deformation of CVC roll in hot strip rolling , 2002 .

[26]  R. Colás,et al.  Modeling the thermal and thermoelastic responses of work rolls used for hot rolling steel strip , 2004 .

[27]  Mavridis,et al.  Danarc technology for electric arc furnaces , 1995 .

[28]  W. Y. D. Yuen,et al.  On the steady-state temperature distribution in a rotating cylinder subject to heating and cooling over its surface , 1984 .