Abstract
The use of coiling and uncoiling in the transfer table stage has important effects on the downstream temperature evolution throughout the hot bar in hot rolling, consequently, it has significant effects on both the uniformity of final mechanical properties and uniformity of final metallurgical properties. Consideration is given herein to the evolution of bar distribution of temperature in the transfer table, when coiling is present, in order to establish possible causes for the lack of the stated uniformity for eventual possible solutions. To address these issues, the mathematical equation of heat diffusion in a shape changing domain, is solved using a novel numerical strategy that uses both Finite Elements and Finite Differences. Numerical results are presented.
Highlights
Coiling, (Fig. 1) is used in the transfer table stage of hot metal mills, and it is used in the run out table after the finishing stands as well
One of the problems facing the industry is the lack of sufficient uniformity in the properties of the final product owing to, basically, non uniform temperature evolution in the hot bar during the entire rolling process
T h e aim in this work is to develop a mathematical and numerical framework to determine an estimate of hot strip temperature evolution in the transfer table that results in bar uneven temperature distribution at the entry of the finishing stands, based on a given initial temperature at the exit of the roughing stand, (Fig. 2) when coiling is present
Summary
Coiling, (Fig. 1) is used in the transfer table stage of hot metal mills, and it is used in the run out table after the finishing stands as well. Using coiling devices in the transfer table results in significant temperature loss reduction and, when done properly, can result in a more uniform temperature at the entry of the finishing stands, producing both more uniform final mechanical properties and more uniform metallurgical properties as well. T h e aim in this work is to develop a mathematical and numerical framework to determine an estimate of hot strip temperature evolution in the transfer table that results in bar uneven temperature distribution at the entry of the finishing stands, based on a given initial temperature at the exit of the roughing stand, (Fig. 2) when coiling is present. AYALA reference^ '^ K From a mechanical prospective, an interesting recent application using FE in hot rolling is given in the bibliography^ \ These types of studies could provide an estimate of the variation of temperature to be added to the analysis presented due to heat generated from plastic deformation both during the rolling process and coiling processes
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