A Ti-enhanced Cold Rolling Work Roll with Self-generating Optimal Roughness Characteristics.

Abstract

One of the important factors in cold rolling is the friction coefficient between strip and work roll. Friction coefficient has a close relationship with surface roughness of the work roll. Therefore, highly wear-resistant work rolls with small diminution of roll surface roughness due to slippage in the bite between strip and rolls have been required for stable rolling operations. In order to meet the need for optimum degree of roughness of work rolls, a new roll with minute and uniformly-distributed titanium carbo-nitrides (hereafter Ti-roll) has been developed. Presumably as a result of such hard titanium carbo-nitrides becoming detached, a new improved roughness profile can be continuously generated on the roll surface while rolling. Actual use of the Ti-roll in cold rolling not only showed the small change in surface roughness of work rolls, but made higher production sure due to higher line speeds in the early stage of the work roll service life, as well as to longer overall roll-life.