Research On High Precise Temperature Model During The Hot Strip Rolling Process

Hot rolled steel strip is an important steel product, and is widely used in many fields.The production of the strip has had a great progress in the nearly past half century. In the process of the strip hot rolling, the strip temperature is the determining factor which affects the precision in the strip dimension and the mechanics performance directly. It is an effective way to predict the steel property by calculating the strip temperature field in the strip steel production. Therefore, it is significant and useful by studying the temperature variation in the rolling process and the temperature field in the work piece.This dissertation is based on the association project named "Precise Temperature Prediction Model in Hot Rolling Process" by RAL and POSCO.The two-dimension temperature mathematics model is developed by using the finite element method (FEM) according the domestic and foreign production lines. The main contents are as following:1)A 2-demesion temperature model for hot rolling is developed by FEM, considering boundary condition of the processes. The temperature increase caused by the deformation in hot rolling, and the changes of thermo-physical parameters were considered.2) The precision of the calculation results were analyzed. The simulation results according to the practicable production line reflected the temperature variation in strip hot rolling exactly.3)The software named PTPM which is able to simulate the strip temperature evolution in the strip hot rolling line was developed by.VB,and post-process was realized by using application softwars MatLab and Office.4) The heat transfer coefficient calculations were analyzed and HTC prediction model which effectively raised the temperature calculation precision was developed.