基于RPECT的板带轧机边部辊形控制特性数值模拟
Numerical simulation on edge roll profile control characteristics of strip rolling mill based on RPECT
-
摘要: 随着航空航天及新能源汽车等高端制造领域对冷轧板带质量要求的日益严苛, 冷轧同板差的精确控制已成为制约产品精度提升的关键技术瓶颈。基于辊形电磁调控技术(RPECT), 本研究提出了一种多层感应加热区结构的新型高效调控电磁棒, 较传统分段式电磁棒具有传热路径更多、热响应更迅速、接触区温升更均匀的优势, 旨在解决现有单机架和连轧机组在薄规格板带生产中存在的边降控制能力不足、工作辊辊形调控受限的问题。根据传热学与电磁学理论, 本研究建立了电磁-热-力多物理场耦合的数值仿真模型, 探究了新型电磁棒与传统分段式电磁棒在不同极限调控位置下的辊形调控规律。结果表明, 新型结构改善了感应加热区的温度分布与传热路径, 提升了接触区平均温升及均匀性, 在降低磁参量设定值的情况下也能够实现与传统结构相同的辊形调控能力, 验证了其高效调控优势。随着电磁棒位置靠近轧辊中部, 尽管其最大热力胀形能力呈微弱衰减趋势, 但衰减幅度在3 μm以内。此外, 边部辊形非对称度也随安装位置远离辊端而逐渐减小。本研究验证了多分区感应加热结构的可行性, 为现代板带轧机边降控制的多物理场执行元件设计提供了理论支撑与依据。Abstract: With the increasingly stringent quality requirements for cold-rolled strips in high-end manufacturing sectors such as aerospace and new energy vehicles, the precise control of transverse thickness difference in cold rolling has become a critical technical bottleneck restricting the improvement of product precision. Based on roll profile electromagnetic control technology (RPECT), this study proposes a novel high-efficiency electromagnetic stick featuring a multi-zone induction heating zone structure. Compared with traditional segmented electromagnetic sticks, this design offers more abundant heat transfer paths, a more rapid thermal response, and a more uniform temperature rise in the contact zone. It aims to address the issues of insufficient edge drop control capability and limited work roll profile adjustability in single-stand and tandem rolling mills during the production of thin-gauge strips. Drawing on theories of heat transfer and electromagnetism, a numerical simulation model for electromagnetic-thermal-force multi-physics coupling was established to investigate the roll profile control laws of the new electromagnetic stick versus the traditional segmented one at various limit control positions. The results indicate that the new structure can improve the temperature distribution and heat transfer paths of the induction heating zone, thereby enhancing the average temperature rise and temperature uniformity in the contact zone. It can achieve roll profile control capability equivalent to that of the traditional structure even with reduced magnetic parameter settings, thereby verifying its high-efficiency control advantages. As the electromagnetic stick is positioned closer to the roll center, its maximum thermal bulging capability exhibits a slight attenuation trend, but the attenuation amplitude remains within 3 μm. Furthermore, the asymmetry of the edge roll profile gradually decreases as the installation position moves further away from the roll end. This study validates the feasibility of the multi-zone induction heating structure, providing theoretical support and a design basis for multi-physics actuators for edge drop control in modern strip rolling mills.
下载: