ROLLING MILL AND ROLLING METHOD FOR METAL SHEET MATERIAL

摘要

The present invention provides a rolling mill for metal sheet material comprising: a housing that accommodates roll chocks, has a pair of first projecting blocks projecting inward toward each other and bearing the force in the direction of rolling that operates on a lower work roll, and forms a housing window that bears the force in the direction of rolling that operates on an upper work roll; a first hydraulic cylinder provided on the pair of first projecting blocks and having a first piston rod that imposes a bending increasing force on the upper work roll; a second hydraulic cylinder provided on the pair of first projecting blocks and having a second piston rod that imposes a bending increasing force on the lower work roll; a third hydraulic cylinder provided on an upper reinforcing roll chock and having a third piston rod that imposes a bending decreasing force on the upper work roll, or makes the upper work roll contact an upper reinforcing roll and generates a roll balance force; and a fourth hydraulic cylinder having a fourth piston rod that imposes a bending decreasing force on the lower work roll.