加热炉内板坯粘塑性下桡变形的研究

在加热妒内，由于高温及重力作用，板坯两端的悬臂将产生下桡变形。悬臂越长，下桡将越大，导致悬臂下桡部分与出口端墙相碰，影响出料而造成事故。本文对加热炉内板坯的下桡变形进行了分析计算。首先，建立了板坯的二维非稳态导热模型并用有限差分法计算了炉内板坯随时间的温度变化；然后建立了板坯悬臂粘塑性变形模型，用有限元法计算了高温条件下由重力引起的悬臂的下桡变形。由此理论模型计算出的板坯抽出温度与悬臂端下桡量与实测结果吻合良好，说明该理论模型及模型计算方法是正确的，可用于对装钢生产进行指导。

Deformation Study of Steel Plate in Heating Furnace Using Visco-Plasticity Model

In heating furnace, because of high temperature and its weight, the steel plate will deform. Both of its end part suspended over the beams will bend down. When the suspended parts are long enough, the ends will touch the exit wall of the furnace, causing difficulties for steel plate to go outside continuously. This paper studies the deformation of steel plate in the heating furnace. Firstly we calculate the temperature changes with the time in the furnace using transient conduction model in two dimensions. Secondly we calculate the deformation of the steel plate caused by gravity at high temperature using visco-plasticity model. The calculated temperature and deformation at the exit of the furnace are consistent with the measured data, which indicates the accuracy of the models along with the calculation methods. It can be used as guidance for loading steel plates in the furnace.