基于模式识别的超宽带钢初始板形与连退跑偏

Ultra wide strip wandering in continuous annealing furnace and initial shape based on pattern recognition

针对超宽带钢在连续退火炉内跑偏所导致的产线降速、停车或断带等系列问题,首先通过现场试验确定带钢非对称初始板形是导致跑偏的关键因素。同时,为了定量分析超宽带钢初始板形形态与退火炉内跑偏的影响规律,对板形仪离线检测数据进行含有3次项的板形基本模式分解,统计分析各个阶次的基本模式板形与带钢连退炉内跑偏的对应关系,并制定防止带钢跑偏的板形控制标准和连退工艺制度。现场实际应用结果表明,超宽规格带钢月均跑偏率从72.5%下降到12.7%,且全年没有发生由于跑偏造成的停车或断带事故,取得了巨大的经济效益和社会效益。

For a series of problems such as the deceleration and stagnation of production line and the strip broken of ultra wide strip in continuous annealing furnace caused by wandering,the current study firstly determined that the initial flatness of strip was the key factor leading to wandering based on field experiment. Meanwhile,in order to quantitatively analyze the relationship between the initial flatness of ultra wide strip and the strip wandering in continuous annealing furnace,the offline data detected by flatness meter was recognized with shape basic pattern including third-order term,and then the influence of separate order of basic pattern flatness on the strip wandering in continuous annealing furnace was statistically analyzed. Finally,according to the relationship between actual field tracking of strip wandering and flatness data of separate order recognition,the control standard of strip flatness and process institution of continuous annealing furnace were formulated to prevent the strip wandering. Practical application results show that the monthly wandering rates of ultra wide strip decreased from 72.5% to 12.7%,and the line stagnation and strip broken accident caused by strip wandering never happened again,which had achieved great economic and social benefits.