热轧带钢尾部“伪板形不良”问题研究  

Research on problem of"pseudo-bad flatness"at tail of hot rolling strip

作　　者：王东城 张亚林[1] 徐扬欢 WANG Dong-cheng;ZHANG Ya-lin;XU Yang-huan(National Engineering Research Center for Equipment and Technology of Cold Rolling Strip,Yanshan University,Qinhuangdao 066004,Hebei,China;State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,Hebei,China)

机构地区：[1]燕山大学国家冷轧板带装备及工艺工程技术研究中心,河北秦皇岛066004 [2]燕山大学亚稳材料制备技术与科学国家重点实验室,河北秦皇岛066004

出　　处：《钢铁》2020年第9期64-68,共5页Iron and Steel

基　　金：国家科技支撑计划资助项目(2011BAF15B00)。

摘　　要：热轧带钢头部与尾部处于非稳态轧制区,容易出现各种尺寸形状质量缺陷。在轧制软薄料时,带钢尾部经常出现一种外观与中间浪类似的"伪板形不良",但其产生机理与板形不良完全不同,因此常规的板形控制手段无法解决该问题。为此,首先对该问题的产生机理进行了分析,发现这一现象的原因是抛钢一瞬间张力消失引起的突然收缩。根据上述机理,对抛钢前F8机架与卷取机的速度匹配关系进行了优化设定,使带钢尾部的"伪板形不良"问题得到极大改善,还避免了带钢表面与辊道之间的擦伤与划伤。The head and tail of hot rolling strip are in the non-stationary rolling zone,which is prone to various size,shape and quality defects.In the process of rolling soft and thin strip,a kind of"pseudo-bad flatness"which have similar characteristics with middle wave often appears at the tail of strip,but its mechanism is completely different from that of bad flatness,so the conventional flatness control method cannot solve this problem.For this reason,the mechanism of the problem is analyzed firstly,and it is found that the reason of this phenomenon is the sudden shrinkage caused by the disappearance of tension in the moment of steel throwing.According to the above mechanism,the velocity matching relationship between F8 stand and coiler before steel throwing is optimized,which greatly improves the problem of"pseudo-bad flatness"at the tail of strip and avoids the scratch between strip surface and roller table.

关 键 词：热轧带钢 尾部 伪板形不良 轧制速度 卷取速度 

分 类 号：TG335.11[金属学及工艺—金属压力加工]