METHODS FOR REDUCING RIDGE BUCKLES AND ANNEALING STICKERS IN COLD ROLLED STRIP AND RIDGE-FLATTENING SKIN PASS MILL

摘要

Flattening steel strip by cold rolling through at least twocold rolling mill stands, where a first of the mill stands hasits work rolls having local rigidity K significantly differentfrom those of a second of the mill stands. The local rigidity Kis calculated in Kgf/mm/mm by the equation(see formula I) where p=roll force per unit strip width(Kgf/mm), u=local work roll flattening (mm), D=work roll diameter(mm), E=work roll elastic modulus (Kgf/mm2), .upsilon.=poisson's ratio,.DELTA.h=local draft of the strip (mm),where (see formula II) and (see formula III).