STEP ROLLING MILL Russian patent published in 2003 - IPC

FIELD: rolled stock production, step rolling mills for deforming strips at large reduction values. SUBSTANCE: step rolling mill includes rolling stand with variable-radius rolling rolls having working and idle sectors; rolling stand is mounted in frame of rolling mill with possibility of reciprocation motion along rolling axis. Mechanism for driving rolls from pinion stand and drive unit for reciprocation motion of rolling stand by action of crank mechanism are provided with two gear wheel pairs mounted on shaft of pinion stand and on shaft of crank respectively. At least one gear wheel of said pairs is in the form of toothed sector. Central angles of toothed sectors mounted on shaft of pinion stand are equal to central angles of working and idle sectors of roll I₁ = 180^°/α, I₂ = 180^°/β, where α- central angle of working sector of roll; β- central angle of idle sector of roll. Toothed sectors are mounted on shafts with possibility of simultaneous engagement only with one gear wheel pair. Such structure provides increased rotation angle of rolling rolls at working stroke of stand. It provides possibility for increased reduction of strip between rolls, allows to lower diameter of rolls and size of rolling mill. EFFECT: enhanced efficiency, reduced cost of rolling mill due to increased rotation angle of rolls at working stroke of rolling stand. 5 dwg