Dual-stage multi-roll leveler and work roll assembly

Abstract

A dual-stage multi-roll leveler and an associated dual-stage work roll assembly. The dual-stage work roll assembly includes independent sets of first stage work rolls and second stage work rolls, with each set of work rolls including one or more upper work rolls disposed above one or more lower work rolls. An adjustable gap is present between the upper and lower work rolls of each work roll set, with the gap being equal from the entry side to the exit side thereof. A dual-stage leveler employs such a work roll assembly to remove shape defects from a moving strip material in the first stage and to remove coil set and/or curl from the strip material in the second stage, through a combination of work roll gap adjustment and first stage work roll bending. Because there is no feathering out of work roll penetration in either stage, differential roll speed and the problems associated therewith are eliminated.