摘要
针对某双机架平整机组生产极薄规格退火板时出现羽痕缺陷的问题,分析认为羽痕缺陷的产生是带钢在平整过程中出现不均匀延伸产生明显分界线而导致的。为此,对平整工艺进行了分析,发现设定张力偏小,CVC辊弯辊力、轴向横移量设定不当,以及轧制力和弯辊力的变化不匹配等因素是造成带钢宽度方向不均匀变形而导致羽痕缺陷产生的主要原因。通过采取平整入口、出口张力较原设定增加20%~30%,开发轧制力、弯辊力前馈程序,优化平整机CVC辊轴向横移量设定,并依据带钢厚度规格将目标板形曲线由0 IU优化为0.5~4 IU边浪等措施,极薄规格带钢羽痕缺陷带出品量从206 t/月降低至51 t/月,其表面质量满足了国内外多家高端用户的需求。
In view of the problem of feather mark defects on the surface of ultra-thin gauge annealed sheets by a double stand temper mill, analysis suggests that the occurrence of feather mark defects is caused by the uneven extension of the strip during the tempering process and produced the obvious dividing line.Therefore, the tempering process was analyzed, and found that the setting tension was too small, the CVC roll bending force and axial shifting value were not proper, and the change of rolling force and bending force was not matched, which were the main reasons for the uneven deformation along strip width direction and caused the feather mark defect.By adopting the measures of increasing the tension at the entrance and exit of temper mill by 20%-30% compared with the original setting, developing the feed-forward program of rolling force and bending force, optimizing the setting of CVC roll axial shifting value of temper mill, and optimizing the target strip flatness curve from 0 IU to 0.5-4 IU edge wave according to the thickness gauge of strip, the output of feather mark defects of ultra-thin gauge strip was reduced from 206 t per month to 51 t per month, the strip surface quality meets the needs of many high-end users at home and abroad.
作者
齐海峰
李靖
唐伟
高利忠
任新意
郑艳坤
QI Haifeng;LI Jing;TANG Wei;GAO Lizhong;REN Xinyi;ZHENG Yankun(Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063200,China)
出处
《轧钢》
2021年第2期86-89,93,共5页
Steel Rolling
关键词
极薄规格
双机架平整机
羽痕缺陷
平整张力
弯辊力
CVC辊轴向横移量
板形曲线
ultra-thin gauge
double stand temper mill
feather mark defects
leveling tension
roll bending force
axial shifting of CVC roll
flatness curve
