中厚板头尾厚度超差原因分析

Cause Analysis of Oversize Thickness of Plate Head and Tail End

基于四辊中厚板轧机,分析了温度、头部沉入、AGC系统、压力传感器和展宽比对中厚板头尾厚度超差的影响。得出头尾温度过低不仅使钢板塑性系数增加,而且造成头尾厚度增厚的遗传效应,增大了厚度超差的可能性。头部沉入对头部厚度的影响可通过沉入补偿进行消除。咬入阶段AGC系统不投入的影响可通过减小咬钢速度的方法进行部分消除。展宽比过小会加剧头尾厚度增厚,展宽比过大会适当减小头尾厚度。

Based on the 4 - h rolling mill for plate, the influence of slab temperature, head end immersion when biting, AGC system, pressure sensor and broadening ratio on oversize thickness of plate head and tail end was analyzed. It is known that low temperature at plate head and end tail greatly affects the thickness, because of not only increasing of plastic coefficient, but of genetic effect of this influence. The influence of head immersion at biting phase on thickness control of plate head and tail end can be removed by immersion compensation. The influence of AGC can be partly released by slowing the biting speed. If broadening ratio is too low, the thickness of head and tail end would thickening, otherwise the thickness would reduce.The results afford theory basic for gauge control of head and tail end. Application in Shougang Plate Mill proved these analytical results are effective.