Modelling Work-Roll Temperature Variations in Hot Strip Rolling

Abstract

Prediction of temperature distribution within work-rolls during the hot strip rolling process is of great importance to mill designers because of the significant role it plays in the product's dimensional accuracy and roll life. The present article employs the unsteady state heat transfer equation with time-dependent boundary conditions, as well as a two-dimensional finite element method, to determine work-roll temperature variations during continuous hot strip rolling. To achieve an accurate temperature field, the authors consider the effects of different factors, including work-roll and metal thermal relationship, idling work-roll revolutions, and the effects of various process parameters such as rolling speed, interface heat transfer co-efficient, and the amount of thickness reduction at each deformation pass. A comparison of the predicted and published experimental results shows the validity of the mathematical model.

Key Words:

• Hot rolling
• work-roll
• temperature distribution
• modelling

Additional information

Notes on contributors

S. Serajzadeh

Siamak Serajzadeh received the BSc in metallurgical engineering, the MSc in Materials Selection and Processing, and the Ph.D. in metal forming from Sharif University of Technology, Tehran, in 1992, 1996, and 2002, respectively. He has joined the department of Materials Science and Engineering at Sharif University of Technology since Sept. 2002 as assistant professor. His research interests include mathematical modelling of macro and micro aspects of hot deformation processes.

A. Karimi Taheri

Alt Karimi Taheri obtained his BSc in Metallurgical Engineering from Sharif University of Technology, a MSc in Nuclear Engineering from the University of Tehran and his PhD from Leeds University in Metal forming. He is now with the department of Materials Science and Engineering at Sharif University of Technology as a professor in metal forming. Prof. Taheri's interests are in simulation and modelling of metal forming process using Upper Bound techniques and the Finite Element Method, composite materials, and aging phenomena in metals and alloys.