SHEET ROLLING METHOD AND APPARATUS FOR PERFORMING THE SAME Russian patent published in 2006 - IPC B21B1/22 

FIELD: plastic metal working, possibly rolling sheet metals in wide strip rolling mills.

SUBSTANCE: sheet rolling method comprises steps of one or several stages of successively reducing hot blank in zone of rough stand group of rolling mill along lateral edges in horizontal plane and also along upper and lower faces in vertical plane; further transportation of rolled piece to zone of finish stand group of mill; several final reducing operations of rolled piece in vertical plane in said zone for rolling strip of predetermined size; transporting strip to coiling apparatus. According to invention one or several initial reduction operations are realized at increasing thickness of rolled piece in zone of its lateral faces till fixed value consisting of 1.04 - 1.15 of initial thickness of blank. Longitudinal swellings of metal in edge zone on both front surfaces of rolled piece are positively formed at inclination angle of their surfaces relative to initial surface of lateral face of rolled piece consisting of 45 - 75° in zone of their contact. Simultaneously rolled piece is reduced along its lateral faces by value 2 - 5%. All further rough reduction operations in horizontal and vertical planes are realized in standard mode. Apparatus for performing the method includes several universal rough stands with horizontal and vertical rolls in zone of rough stand group; intermediate roller table; several final rolling stands with horizontal rolls in zone of finish stand group; outlet roller table and group of coiling devices. According to invention each rolling roll includes cylindrical barrel and journal. On working surface of cylindrical barrel of one or several pairs of vertical rolls of first universal rough rolling stands there are annular turnings with depth consisting 0.03 -0.10 of diameter of roll cylindrical barrel. Width of bottom of each turning consists 0.9 - 1.0 of blank initial thickness. Lateral walls of turnings are widened from their bottoms by angle 45 - 75° relative to bottom surface. Turning is arranged relative to roll axis in such a way that lower edge of its bottom is placed on level consisting of 0.02 - 0.1 of initial thickness of blank relative to level of roller table at inlet of rough stand group. In central zone of bottom of turning there is annular spherical protrusion with height consisting of 0.02 - 0.08 of blank initial thickness and with apex radius consisting of 0.2 - 0.4 of blank initial thickness. Cylindrical, conic and spherical surfaces of turning on working surface of roll are joined at rounding radiuses.

EFFECT: enhanced quality of ready strip due to lowered number of flaws of near-edge zone of front surfaces of products, reduced factor of metal consumption.

2 cl, 3 dwg, 1 tbl, 1 ex