聚磁形式对辊形电磁调控能力的影响

 辊形电磁调控技术是一种轧辊辊廓动态控制技术。该技术依托电磁调控轧辊和内置电磁棒,借助热胀形及内约束机制形成热力胀形驱动,并以此来实现辊形的在线动态调节。该技术中,提升其热力混合驱动能力是优化调控工艺的关键,也是提升该技术时效性及调控效力的主要方法。根据电磁感应原理及电磁调控轧辊结构特点,合理的聚磁结构具有改善磁力线空间分布的能力,可用于提升该技术的热力混合驱动能力。从辊形电磁调控技术特点和电磁感应原理出发,提出了3种聚磁形式,包括完全聚磁、局部聚磁和无聚磁等。依托辊形电磁调控仿真模型,分析了不同聚磁形式对辊形电磁调控特性的影响规律并判别聚磁形式调控效果的差异。研究结果表明,采用聚磁装置能够提升感应加热区及接触区的温度水平,显著提升电磁棒的调控能效;接触区温升进一步增强了轧辊与电磁棒间的换热,最终提升了轧辊内部温度水平。不同的聚磁形式影响下,辊棒的温升变化共同作用可提高力贡献辊凸度占比、提升电磁调控轧辊的可控性。3种聚磁形式中,完全聚磁形式对电磁调控轧辊的热力混合驱动能力影响最为显著,其次为局部聚磁形式,而无聚磁形式最弱。研究结果提供了一种提升辊形电磁调控能效的方法,这对于电磁调控轧辊及电磁棒的结构设计、过程工艺设定具有一定指导意义。

Influence of magnetic gathering structures on roll profile electromagnetic control ability

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.