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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。
Based on the heat conduction equation, considering the complex dynamic boundary conditions such as the continuous continuous deformation and the continuous cooling of the continuous strip in hot strip mill, a three-dimensional transient temperature field model was established by coordinate mapping in each frame deformation zone by finite difference method. Transient temperature distribution was calculated using a cross-section in the non-rolling area between racks, and the two temperature field models were iteratively solved for each other. The simulation results show that there is a large temperature difference between the two sides of the strip and a large local thermal stress is easily formed. The thicker the strip and the larger the reduction, the larger the temperature difference of the strip will affect the hot strip Material internal organizational evolution. The simulation results are in good agreement with the measured data, which shows that the model can accurately predict the transient temperature distribution and finish rolling temperature in hot strip rolling zone.