JPS5747504A - Rolling method with different circumferential roll speeds - Google Patents

Abstract

PURPOSE: To prevent the generation of a difference between surface properties of front and underside of a rolled strip, by offsetting the horizontal positions of upper and lower work rolls, when a strip is rolled by upper and lower work rolls rotated at different circumferential roll speeds.

CONSTITUTION: An upper work roll 12 and a lower work roll 14 are respectively rotated at different circumferential speeds v₁, v₂, for rolling a strip 10; hereupon, the center of the lower work roll 14 is offsetted by a distance δ toward the strip's feed-in side. Or otherwise, on the contrary to that, the lower work roll 14 is similary offset to the strip's run-out side, and the rolling work is practiced under this condition. In general, at a rolling method with different circumferential roll speeds, if v₁>v₂, the friction factors μ₁, μ₂ between the strip 10 and the upper and lower work rolls 12, 14 are in a relation μ₁<μ₂; as an effect of these different friction factors, the luster, roughness, etc., of a strip 10 differ between the front and underside so that its surface property becomes declined; however, by offsetting the positions of work rolls 12, 14, the friction factors μ₁ and μ₂ become almost equal, so that the difference between the surface properties of the strip's front and underside is eliminated.

COPYRIGHT: (C)1982,JPO&Japio