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为了分析热轧带钢在卷取过程中层间摩擦力分布和确定卷筒胀径时最小带卷层数,利用有限元的手段再现了热轧带钢卷取的全过程。在热轧带钢厚度为5~20 mm和带卷层数为2~5层的基础上,研究了卷筒胀径过程中热轧带钢层间和最内层节点金属的流动规律,提出了以热轧带钢头部相对位移的大小为判据,获得了胀径过程热轧带钢不发生松卷的条件。研究结果表明:摩擦力分布和胀径时热轧带钢的层数有关,当热轧带钢卷取到第5层时卷筒进行胀径可建立稳定的卷取状态。研究成果对提高热轧带钢卷取的产量和减少助卷辊的磨损有一定的指导意义。
In order to analyze the distribution of friction between layers during the coiling process and determine the minimum number of belt layers during hot rolling, the whole process of hot strip rolling was reproduced by means of finite element method. On the basis of the hot strip thickness of 5 ~ 20 mm and the number of belt layers of 2 ~ 5, the law of metal flow in hot rolled strip and the innermost layer of the hot strip was studied. Taking the relative displacement of the head of the hot rolled strip as the criterion, the condition that the hot rolled strip does not get loose is obtained. The results show that the distribution of friction is related to the number of layers of hot rolled strip when the diameter is expanded. When the hot rolled strip is wound up to the fifth layer, the diameter of the roll can be expanded to establish a stable coiling condition. The research results have some guiding significance to improve the output of hot rolled steel coil and reduce the wear of the auxiliary roller.