冷轧铝带卷取内部应力有限差分仿真研究

目的研究冷轧铝带卷取内部应力的分布情况以及影响因素,为铝带卷筒的设计提供参考。方法通过冷轧铝板压缩实验,测定铝带径向压缩系数与应力的关系曲线;采用非线性有限差分法对卷取过程和内部应力进行仿真;分析线性、一次非线性和二次非线性材料模型以及卷筒刚度对带卷内部应力分布的影响。结果径向压缩系数的理论值与实验值有较好的一致性,卷筒刚度对铝带卷内层应力影响较大,而对外层影响很小,卷筒刚度较小时,在卷芯处容易产生塌卷缺陷,卷筒刚度较大时,容易出现扁卷现象。结论计算带卷内部应力分布时,需要考虑铝带卷的各向异性以及层与层之间的紧密程度,合理选择卷筒的刚度对提高卷取质量有很大的实际意义。

Finite Difference Simulation of Internal Stress for Cold Rolled Aluminum Stripcoil

The paper aims to study distribution of internal stress in coiling of cold rolled aluminum strip and influencing factors to provide reference for design of aluminum strip drum. Through the cold rolling of aluminum compression test, relation curves for radial compression coefficient and stress of aluminum strip were determined; nonlinear finite difference method was used to simulate coiling process and internal stress; effects of linear, first-order nonlinear and second-order nonlinear material models and stiffness of drum on stress distribution inside the roll were analyzed. The calculated radial compressive coefficient was in good agreement with the experimentally values; drum stiffness had great influence on inner stress of aluminum coil, but had little effect on the outer layer. When stiffness of drum was small, it was easy to produce collapse defect at core, when drum stiffness was large, it was easy to flat rolling phenomenon. When calculating internal stress distribution of a coil, it is necessary to consider the anisotropy of the aluminum coil and the tightness between the layers, reasonable choice of rigidity of drum has great practical significance on improving the coil quality.