ASP1700热轧层流冷却过程中影响板形变化的热应力求解

Calculation of Thermal Stress Affecting Strip Flatness During Run-Out Table Cooling of ASP 1700 Strip Mill

采用ABAQUS有限元软件对鞍钢ASP1700热轧带钢在层流冷却过程中的热应力变化进行了数值模拟,分析了带钢在层流冷却中板形变化的趋势。分析结果表明,带钢边部存在的温降导致带钢中间受拉应力,边部受压应力,带钢平坦度有向着边浪发展的趋势,与生产中观测到的结果一致。以所得结论为依据,提出了微中浪轧制的板形控制策略,以补偿热轧带钢层流冷却过程对带钢平坦度带来的影响,并在鞍钢ASP1700热轧生产线上应用,通过对带钢冷却前后板形状况的跟踪观测,发现微中浪轧制板形补偿控制策略效果非常明显。

A numerical analysis of the thermal stress generated during cooling of hot rolled strip on run-out table of ASP1700 was performed by means of finite element program ABAQUS. For studying trend of flatness change during cooling of strip. The results demonstrated that temperature drop at strip edges leads to a residual stress distribution pattern with tensile at strip center and compressive stress at edges. Thus a trend of edge wave formation is observed as proved by the practice of skin pass rolling. A compensation control strategy, named slight center wave rolling, was proposed based on the FE analysis work to compensate the edge wave during the cooling, and adopted on ASP1700. The validity of this control strategy was confirmed by the practice.