Varying contact-length backup roll and linearly variable crown work roll are provided for improving the mill performance of profile and flatness control.Integrated with theses technologies, relevant profile and flatness control models are developed for hot strip mills on the basis of large amount of finite element calculation.These models include shape setup control model in process control system,bending force feedforward control model,crown feedback control model and flatness feedback control model in basis automation system.Such a profile and flatness control system with full functions is applied in 1700 mm industrial hot strip mills of Ansteel.Large amount of production data shows that the crown precision with the tolerance of±18μm is over 90%,the strip percentage which the actual flatness is within±25 I-unit surpasses 96%,and general roll consume is reduced by 28% by using the profile and flatness control system.In addition,schedule-free rolling is realized.
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