单机架热轧机板材厚度控制系统改造

Remolding on Plate Thickness Control System of Single-Stand Hot Rolling Mill

根据在轧制力相等条件下轧机辊缝弹跳量相同的原理,提出一种采用调整负荷分配使末两道次轧制力相等来进行末道次辊缝在咬入前设定和咬入后动态修正的单机架热轧机厚度控制方法。首先,自动设定最后两个道次轧制力接近,并采集倒数第2道次轧制过程中的电动压下定位偏差补偿、轧机平均辊缝和平均轧制力,并将该平均轧制力作为末道次目标轧制力;然后,结合人工卡量厚度计算末道次咬入前预摆辊缝,并由压下机构执行到位;最后,在末道次轧制过程中,通过比较末道次实际轧制力和倒数第2道次平均轧制力,结合弹跳方程实时计算辊缝调整量,以保证厚度精度。现场应用效果表明,可在不依赖测厚仪的情况下对采用电动和液压压下的单机架铝板热轧机厚度进行精确控制。

According to the principle that the roll gap of rolling mill is the same under the condition of equal rolling force, this paper presents a method for controlling the thickness of single-stand hot rolling mill, which adopts adjusting the load distribution so that the final two rolling reductions are equalized, and the dynamic adjustment of the final secondary roll gap before biting in and biting in is performed. Firstly, the rolling force of the last two passes is automatically set to be close, and the electric pressuring positioning deviation compensation, the average roll gap, the average rolling force are collected during the rolling of penultimate pass. And the average rolling force is used as the final target rolling force, and then combining the thickness of the manual card to calculate the pre-slit roll gap and perform it by pressing mechanism. Finally, based on comparing the actual rolling force at the last pass and the average rolling force at the penultimate pass during the final pass rolling process, the adjustment amount of the roll gap is calculated in real time in conjunction with the bouncing equation to ensure the thickness accuracy. Field application results show that the thickness of single-stand aluminum hot-rolling mill with electric and hydraulic pressure can be precisely controlled without relying on the thickness gauge.