Thermal Behavior and Temperature Uniformity of Rolling Parts during Edge Induction Heating

doi:10.3901/JME.2024.02.119

Abstract

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

CLC Number:

TG155

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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