A 12-high cluster mill (SCM: stainless cold mill) at Chiba Works has been used for the cold rolling of high brightness stainless steel strips since March 1991. To produce higher quality strips with higher productivity, two new technologies were developed and applied to the mill. One is an automatic gauge control system and it improves accuracy of thickness in the accelerating and decelerating stages, while maintaining the accuracy during the constant stage of the rolling process. The other technology is the development of an automatic set-up system to control strip flatness. A mathematical model for the set-up of optimal positioning of flatness actuators makes good strip flatness possible and allows an immediate increase in rolling speed after the start of rolling.
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