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| Influence of magnetic gathering structures on roll profile electromagnetic control ability |
| YANG Ting-song1,2, BAI Yu-hang1,2, LEI Zhen-yao1,2,3, XU Zhi-qiang1,2, DU Feng-shan1,2 |
1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, Hebei, China;
2. School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China;
3. Equipment Department, Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063210, Hebei, China |
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Abstract Roll profile electromagnetic control technology (RPECT) is a dynamic control technology of roll profile. The technology relies on the thermal expansion of electromagnetic stick and internal restraint mechanism of electromagnetic control roll, forming thermal-force expansion to achieve dynamic adjustment of roll profile. In this technology, improving the thermal-force driving ability is the key to optimizing the control process of RPECT, and also the main method to improve the timeliness and control effectiveness of the technology. According to the principle of electromagnetic induction and the structural characteristics of electromagnetic control roll, the reasonable magnetic structure has the ability to improve the spatial distribution of magnetic force lines, which can be used to improve the thermal-force driving ability of RPECT. Based on the characteristics of RPECT and the electromagnetic induction principle, this paper proposes three forms of magnetic gathering structures, including complete magnetic gathering structure, local magnetic gathering structure and non-magnetic gathering structure. Through the simulation model of RPECT, the influence of magnetic gathering structures on roll profile electromagnetic regulation characteristics is analyzed, and the difference of regulation effects is identified. The results show that the magnetic gathering device can improve the temperature level of induction heating zone and contact zone, and significantly improve the regulation energy efficiency of electromagnetic stick. The temperature rise in the contact area further enhances the heat exchange between the roll and the electromagnetic stick, and finally improves the internal temperature level of the roll. Under the influence of different magnetic gathering structures, the temperature rise of roll and stick can improve the proportion of force contribution roll crown and the controllability of electromagnetic control roll. Among the three magnetic gathering structures, the complete magnetic gathering structure has the most significant influence on the thermal-force driving ability of the electromagnetic control roll, followed by the local magnetic gathering structure, and the non-magnetic gathering structure is the weakest. This paper provide a method to improve the energy efficiency of RPECT. The research results of this paper have certain guiding significance for the structural design and process setting of electromagnetic control roll and electromagnetic stick.
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Received: 04 January 2022
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2022, Vol. 57 
