边部感应加热过程中的轧件热行为与温度均匀性研究

doi:10.3901/JME.2024.02.119

摘要/Abstract

摘要： 用边部感应加热器提高带材边部温度，改善产品质量是近年来带材生产的新工艺。目前对于边部感应加热过程中带材的温度分布及感应加热后带材的温度均匀性的研究较少。为获得感应加热过程轧件宽向温度的分布规律，利用COMSOL软件建立了C型边部感应加热器的电磁-热耦合的有限元模型，系统探讨轧件运动过程中工艺参数变化对电磁场分布、涡流密度及轧件宽向温度分布的影响规律。结果表明，使用边部加热器能够快速补偿边部温降，轧件边部温升与电流频率、电流大小成正比，与轧件厚度和运行速度成反比；为进一步研究感应加热后轧件运行过程中温度变化对温度分布均匀性的影响，用宽向温度标准差对宽向温度分布均匀性进行评价，研究发现边部温度提高有助于减小温度标准差，提升温度分布均匀性，但仍会由于边部过热出现“猫耳状”高温区，在感应加热过程中当边部温度提高约80 ℃时，精轧入口测温点处的宽向温度分布均匀性最优，温度标准差由13.71 ℃减小至6.15 ℃。研究结果能够为运动条件下轧件边部加热工艺的优化提供参考依据。

关键词: 热连轧, 感应加热, 电磁场, 温度场, 温度均匀性

Abstract: The use of edge induction heaters to increase the strip edge temperature and improve the product quality is a new process for strip production in recent years. At present, there are few studies on the temperature distribution of the strip during the edge induction heating process and the temperature uniformity of the strip after induction heating. In order to obtain the wide temperature distribution law of rolled piece during induction heating process, a coupled electromagnetic-thermal finite element model of C-type edge induction heater is established by COMSOL software. The influence of process parameters on electromagnetic field, eddy current density and temperature distribution in wide direction during rolling process are discussed systematically. The results show that the edge temperature drop can be rapidly compensated by using the edge heater, and the edge temperature rise is directly proportional to the current frequency and current magnitude, but inversely proportional to the thickness and running speed of the rolled piece. For further study the influence of temperature change on temperature distribution uniformity of moving piece after induction heating, the widthwise temperature distribution uniformity is evaluated by the widthwise temperature standard deviation. The study finds that increasing temperature can help to reduce temperature standard deviation of edge, and improve temperature distribution uniformity, but a “cat-ear-like” high temperature area still appears due to the overheating of the edge, In the induction heating process, when the edge temperature increases by about 80 ℃, the temperature distribution uniformity in the wide direction is the best at the temperature measuring point at the finishing mill entrance, and the standard deviation of temperature decreases from 13.71 ℃ to 6.15 ℃. The results can provide a reference for the optimization of edge heating process under moving condition.

Key words: hot rolling, induction heating, electromagnetic field, temperature field, temperature uniformity

中图分类号:

TG155

彭文, 张丽, 李旭东, 刘军, 孙杰, 张殿华. 边部感应加热过程中的轧件热行为与温度均匀性研究[J]. 机械工程学报, 2024, 60(2): 119-131.

PENG Wen, ZHANG Li, LI Xudong, LIU Jun, SUN Jie, ZHANG Dianhua. Thermal Behavior and Temperature Uniformity of Rolling Parts during Edge Induction Heating[J]. Journal of Mechanical Engineering, 2024, 60(2): 119-131.

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