Two-dimensional alternate difference method for predicting plate-belt temperature field during hot rolling

Abstract

The invention provides a two-dimensional alternate difference method for predicting a plate-belt temperature field during hot rolling and belongs to the technical field of rolling. According to the method, (1) plate blank incoming material parameters and rolling course data are collected; (2) difference grid division is conducted on a plate-belt cross section, grid nodes are numbered, and a finite difference model is established; (3) according to technological parameters of different rolling courses, boundary conditions and an internal thermal source are determined; (4) an explicit-implicit alternate difference format is adopted, and a heat conduction differential equation is transformed into a differential equation format; (5) a chasing method is used to solve a differential equation set rapidly, so that an instant temperature field of plates and belts can be obtained; and prediction is completed. The method considers field working conditions and boundary conditions during hot rolling comprehensively, and universality is high; the plate-belt temperature field at each stage during the whole hot rolling course, as well as the plate-belt temperature field of the whole hot rolling line can be predicted, information is detailed and accurate, and prediction accuracy is high; and computation duration of the hot rolling plate-belt temperature field is short, computation efficiency is high, and the method can be used in an offline or online manner.

Description

technical field [0001] The invention relates to the technical field of rolling, in particular to a two-dimensional alternating difference method for predicting the temperature field of a strip during hot rolling. Background technique [0002] Temperature is one of the most important process parameters in the hot rolling production process. Since the temperature will directly affect the dimensional accuracy and mechanical properties of the hot-rolled strip, it is necessary to accurately predict and control the hot-rolled strip at each point during the rolling process. The temperature in the process is an important prerequisite for ensuring the quality of the strip. [0003] At present, the methods for predicting the temperature field of hot-rolled strips mainly include mathematical models, finite element methods, and finite difference methods. The mathematical model mainly calculates the temperature field through a simplified empirical formula, ignoring the heat conduction i...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the disadvantages of low accuracy, slow speed, poor convergence stability and large amount of calculation of various existing methods for predicting the temperature field of the hot-rolled strip, and provides a two-dimensional alternate difference method for predicting the temperature field of the strip during the hot-rolling process

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