极薄带轧制板形解析模型与实验研究

Analytical model and experimental study on ultra-thin strip rolling shape

在极薄带轧制理论的基础上,利用能量法建立了极薄带变形区出口处金属横向位移分布新模型,然后建立了考虑金属横向流动的张力模型。以二十辊轧机为研究对象,通过耦合轧制力模型、金属塑性变形模型、张力模型及辊系弹性变形模型,建立了二十辊轧机板形解析模型。利用实验室二十辊轧机进行了不同张力、第一中间辊锥长和第一中间辊锥度的极薄带轧制实验研究。针对每种实验工况利用上述解析模型进行了理论分析,理论分析结果与实验结果一致,结果表明第一中间辊锥长及锥度对极薄带板形调节效果比较明显,张力大小对微小的板形缺陷有调节效果,从而证明了解析模型的准确性。

On the basis of ultra-thin strip rolling theory,a new model of transverse displacement distribution of metal at the exit of de-formation zone of ultra-thin strip was established by energy method,and then a tension model considering transverse flow of metal was es-tablished.Taking the twenty-high mill as the research object,an analytical model of the strip shape for a twenty-high mill was established by coupling rolling force model,metal plastic deformation model,tension model and roll system elastic deformation model.The ultra-thin strip rolling experiment of different tensions,taper lengths of the first intermediate roll and taper angles of the first intermediate roll were carried out on the twenty-high rolling mill in laboratory.The theoretical analysis was carried out for each experimental condition by using the above analytical model.The theoretical analysis results are consistent with the experimental results.The results show that the taper length and taper angle of the first intermediate roll have obvious effect on the shape adjustment of the ultra-thin strip and the tension has an improvement effect on the small flatness defects,which adjusts the accuracy of the analytical model.