退火冷轧钢卷开卷时表面横折印问题

冷轧带钢钢卷在平整机上开卷时,带钢表面有时会出现横折印缺陷. 为了减小带钢表面的横折印缺陷,通过建立平整机开卷过程有限元模型,研究了冷轧带钢钢卷在开卷过程中应力的大小分布及影响因素,分析了开卷张力、板厚、粘结程度和钢卷半径等与产生横折印的关系,提出了减小带钢在打开过程中的反弯和罩式炉中的粘结程度来克服带钢表面横折印缺陷的途径,并发现增大开卷张力有利于减轻或避免横折印的产生,消除了关于开卷张力与横折印关系的错误认识.

Surface wrinkles of cold rolling strips on the uncoiler

In order to solve the problem of cold rolling strip surface wrinkles on the uncoiler,the stress distribution of a cold rolling strip on the uncoiler and its influencing factors were investigated by finite element method.The linkings of the uncoiler tension,strip thickness,adhesion degree and coil radius on the wrinkles were analyzed.Some measures to avoid the wrinkles were put forward by minishing the reverse bending degree of the strip on the uncoiler and the adhesion degree in the bell annealer.It is pointed that increasing the uncoiler tension can minish or avoid the wrinkles.