热连轧精轧过程中带材瞬态温度场的精确计算

来源期刊：钢铁2009年第10期

论文作者：杨利坡 王英睿 王英杰

文章页码：41 - 45

关键词：温度场； 热连轧； 精轧； 有限差分法； 坐标映射

Key words：temperature field； hot tandem rolling； finish rolling； finite difference method； mapping of coordinate

摘    要：基于热传导方程,考虑热连轧精轧区板带周期性地连续变形和连续冷却等复杂动态边界条件,利用有限差分法,在各机架变形区利用坐标映射关系建立三维瞬态温度场模型,在机架间非轧制区利用某横截面计算瞬态温度分布,这两种温度场模型互为条件,迭代求解。仿真结果表明,带材两侧边部有较大温差,易形成较大的局部热应力;带材越厚,压下量越大,带材高向温差越大,将会影响热连轧带材内部组织演变过程。仿真结果与实测数据吻合较好,表明模型能够精确预报热连轧精轧区板带的瞬态温度分布及终轧温度。

Abstract: Based on the heat conductivity equation,complex dynamic boundary conditions of periodically continuous deformation and cooling in the hot tandem rolling finish rolling area were considered,by using the finite difference method,the plate three dimensional transient temperature field model was established in the deformation area of every stand with coordinate mapping relations,and the transient temperature field in the non-rolling area between two stands was computed by some lateral section.These two kinds of temperature field models are mutually conditional for iterative solution.The simulation results indicate that nearby the strip both sides have the great temperature difference,easy to form the big partial thermal stress;and the strip is thicker,reduced quantity is bigger,the temperature difference of strip is bigger,that will affect the metal organization variation process greatly.The simulation results and the measured datum tallied well and indicated that this model precisely forecasts the plate transient state temperature distribution of the finish rolling area and the final rolling temperature in the hot tandem rolling.