Patent ID: 6012319
Filing Date: 2000-01-11
Classification: B21B

Abstract:
A rolling mill provided with a pair of work rolls for rolling a plate, a pair of intermediate rolls supporting said pair of work rolls, respectively and a pair of backup rolls supporting said pair of intermediate rolls, respectively, in mill stands, whereinsaid pair of backup rolls are arranged so that the axial lines of said pair of backup rolls do not incline to each other in a horizontal plane,said intermediate rolls and work rolls are arranged so that each of the axial lines of said intermediate rolls and work rolls can incline contrarily to the axial lines of said backup rolls in a horizontal plane, andsaid rolling mill comprises:a lubricant supplying apparatus for supplying lubricant to the roll surfaces of said work rolls, intermediate rolls and backup rolls,a work roll thrust force measuring unit for measuring thrust force of said work rolls in an axial direction,a thrust force setting unit for setting an allowable thrust force,a work roll cross angle arithmetic unit for comparing a set value from said thrust force setting unit and a measured value of thrust force and calculating a change amount of cross angle of said work rolls,an intermediate roll cross angle arithmetic unit for calculating a change amount of cross angle of said intermediate rolls according to the change amount of cross angle of said work rolls,a work roll cross angle changing unit for receiving a signal from said work roll cross angle arithmetic unit and changing the cross angle of said work rolls, andan intermediate roll cross angle changing unit for receiving a signal from said intermediate roll cross angle arithmetic unit and changing the cross angle of said intermediate rolls.