四辊可逆窄带轧机轧制规程设定方法

Setting method of rolling schedule for reversible four-high mill of narrow strip

针对单机架四辊可逆窄带轧机因工作辊辊径绝对值较小而引起的工作辊水平位移不可忽略、工作辊热凸度偏大、板形构成更为复杂、板形控制难度增大且对轧制规程依赖性更强的问题,充分考虑到单机架四辊可逆窄带轧机的设备与工艺特点,在建立了单机架四辊可逆窄带轧机轧制规程对板形影响模型、分析了特定道次规程参数对板形影响的基础上,以轧制道次相对负荷最均匀为目标,同时兼顾板形控制、轧制稳定性以及表面缺陷防治等因素的影响,提出了一套适合于单机架四辊可逆窄带轧机兼顾板形控制的轧制规程综合优化设定方法,并将相关技术应用到某公司450mm四辊轧机的生产实践,取得了良好的使用效果,机组板形封闭率下降了45.5%。

The small four-high rolling mill of narrow strip has such structural features of small absolute value of working roll diameter,which causes problems like non-negligible horizontal displacement of the work rolls,larger thermal crown of the work roll,and more complicated shape control of the plate.The shape was more dependent on rolling schedule.The equipment and process characteristics of reversible four-high mill of narrow strip were fully considered.The influence model of rolling schedule of small four-high rolling mill on shape was established.The influence of specific path rolling schedule parameter on the shape was quantitatively analyzed.The targets were that the rolling pass was minimum and the relative load was the most uniform.Meanwhile,the influences of such factors as shape control,rolling stability and prevention of surface defects were also considered.A set of comprehensive optimization method for rolling schedule was put forward,which was suitable for small four high mill and taking account of shape control.Relevant technology was applied to the production practice of 450 small four high rolling mill in a company.Good results were achieved after the application in the field.The shape closure rate of the unit decreases by 45.5%.