热轧带钢层流冷却过程中的热力耦合求解

Coupled solving of thermal-stress during run-out table cooling in hot steel strip rolling

采用ABAQUS有限元软件对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,计算结果表明,在层流冷却过程中,带钢边部存在的温降导致带钢中间部位受拉应力,而在带钢边部受压应力,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。当有卷取张力时,带钢中部的应力有小幅度的增长,增长量几乎与所施加的卷取张力的大小相同,但卷取张力对带钢平坦度的影响很小。依据以上结果,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。

A numerical analysis of the thermal stress generated during cooling of hot rolled strip on the run - out table was performed by means of the finite elemeut program ABAQUS. Analysis results demonstrate that temperature drop within strip edge leads to the residual stress distribution pattern of tensile stress at strip center region and compressive stress at strip edge region. That is to say, the strip flatness develops to the trend of edge wave, and has been proved by the actual strip flatness observation on skin pass rolling line. When coiling tension was considered, stress in the center part of strip width has a small increase that almost equals to coiling tension loaded. The influence of coiling tension on strip flatness is little. One compensation control strategy, named slight center wave rolling, is proposed based on the FE analysis work to compensate the flatness change trend of edge wave during the cooling.