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| Prediction and analysis of rolling force and width spread in rough rolling |
| WANG Zhen-hua1,2, LIU Yuan-ming1,2, WANG Tao1,2, SUN Jie3, ZHANG Dian-hua3 |
1. College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;
2. Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment, Ministry of Education, Taiyuan University of Technology,Taiyuan 030024, Shanxi, China;
3. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China |
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Abstract The mathematical model of plate-strip rolling is the basis of automatic control,and the high-precision mathematical model is an important guarantee to improve product quality and market competitiveness. Rolling force and width spread are the key parameters in the hot continuous rolling process control. Their model accuracy not only affects the setting of rough rolling procedures,but also affects the profile of the final strip product. The rectangular slab rolling process of hot continuous rolling was taken as the research object and the three dimensional kinematically admissible weighted velocity field of rough rolling was established for the rolling deformation zone. Considering the width spread effect,based on the first variation principle of rigid-plastic material,the variable upper limit integration method was used to integrate plastic deformation,shear and friction power to get the total power functional of the deformation zone. The theoretical analytical solutions of the rolling force and width distribution were obtained by minimizing the total power functional using the Matlab optimization toolbox. Finally,the slab width spread model and weighted coefficient model of velocity field were obtained by using the data regression of the calculation results of the theoretical analytical model. The rolling force and spread predicted by the model proposed were compared with the on-line measured data and the predicted values of the model established by some relevant scholars. The results verified the accuracy of the model established. The spread model and the expression of velocity field weight coefficient are obtained from the research can be conveniently,flexibly and quickly applied to the rough rolling site,which lays a solid foundation for the production of higher quality hot strip products.
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Received: 09 May 2022
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2022, Vol. 57 
