LI Haijun
,
XU Jianzhong
,
WANG Guodong
,
LIU Xianghua
钢铁研究学报(英文版)
Load distribution is a key technology in strip hot rolling process, which influences the coil′s microstructure and performance. Currently, NewtonRaphson algorithm is applied to load distribution of hot tandem mills in many hot rolling plants and has some serious defects such as having a strict restriction on initial iterative calculation value and requiring coefficient matrix of nonlinear equations to be nonsingular. To eliminate these defects and improve the online performance of the process control computer, Newton descendent numeric algorithm is introduced to this field to widen the initial value range and a new model named error conversion algorithm is put forth to deal with special conditions when the coefficient matrix is singular. Furthermore, considering the characteristics of load distribution, a condition of strip thickness distribution abnormality and corresponding solutions are provided which ensure that rolling parameters can be calculated normally. Simulation results show that the improved algorithm has overcome the defects of the NewtonRaphson algorithm and is suitable for online application.
关键词:
load distribution;hot tandem mill;process control computer;NewtonRaphson algorithm
GUO Zhongfeng
,
LI Changsheng
,
XU Jianzhong
,
LIU Xianghua
,
WANG Guodong
钢铁研究学报(英文版)
Thermal crown of roll is an important factor, which affects strip profile. It is necessary to analyze the temperature field and thermal crown of roll for hot strip mill. A new simplified finite element method (FEM) was used to analyze the temperature field and thermal crown of roll, and corresponding models were built according to the practical boundary conditions. Transient roll temperature field and thermal crown were simulated by ANSYS FEM software with considering transient thermal contact and complex boundary condition. Temperature and thermal crown variations on roll surface nodes were obtained. The thermal crown results of roll obtained by FEM simulation were in good agreement with the measured data, indicating that simplified FEM models and results were correct.
关键词:
temperature field;thermal crown;FEM;roll
