极薄带轧制变形区轧辊压扁试验与有限元模拟

极薄带在轧制及平整过程中,工作辊的弹性压扁对轧制压力的分布有很大影响,传统的轧制力模型已经不再适用。为了在极薄带板形板厚控制过程中得到准确的轧制力,Fleck提出了新的轧辊压扁模型。针对Fleck模型进行试验研究,同时进行有限元模拟分析。试验过程中使用合金工具钢轧辊,轧制不同厚度的轧件,通过显微镜测量变形区各部位的厚度,得到变形区轧辊的近似轮廓形状。试验与有限元模拟结果表明,随着轧件厚度的减小,变形区出现了明显的中性区,但是很难出现Fleck模型中提到的弹性卸载区,因此计算极薄带轧制力时可以忽略中性区内的弹性卸载区以简化轧制力模型。

Experiment and finite element simulation of roll flattening in deformation zone for ultra-thin strip rolling

The work roll flattening has significant effect on the distribution of rolling pressure during cold ultra-thin strip rolling and temper rolling,thus,the conventional rolling force models are no longer applicable.To obtain accurate rolling force in shape and gauge control process for the ultra-thin strip rolling,Fleck proposed a new roll flattening model.In this paper,the experiment and finite element simulation were carried out to evaluate Fleck model.Workpieces with various thicknesses were rolled by using alloy steel rolls during the experiments.The approximate profile of the roll in the deformation zone was obtained by measuring the thicknesses of different workpiece positions by microscope.Experimental and finite element simulation results show that there was a clear neutral zone in the deformation zone with the decrease of the thickness of the workpiece.However,there is almost no elastic unloading zone in the neutral zone which was mentioned by Fleck.Thus,to simplify the rolling force model,the effect of no elastic zone could be ignorable for the calculation of rolling force.