Patent ID: 7434435

Claim:
Method for applying an adjustable tensile stress distribution in edge regions during the cold rolling of metal strip, for the purpose of reducing a risk of excessive buildup of tensile stress and a risk of edge cracks in the strip, which can have a negative consequence of strip breakage and thus reduced production, and for the purpose of improving the strip surface and its flatness, even at relatively high strip running speeds, and of reducing strip trimming widths, comprising the step of: (a) separation of lubrication and cooling of work rolls by lubrication on a run-in side and cooling on a runout side, the improvement comprising the additional steps of: (b) additional influencing of the strip edges by hot edge spray by spraying rolling oil with different temperature ranges in different zones, (c) the use of work rolls having a special cross-sectional configuration in an area of the strip edges, which special configuration is independent of the hot edge spray, for partial material buildup during a roughing pass, which results in a longer strip edge in following passes and counteracts the risk of excessive buildup of tensile stress.