BACKUP ROLL OPERATION METHOD Russian patent published in 1997 - IPC

FIELD: four-high mills for cold and hot rolling of steel sheets. SUBSTANCE: method comprises alternative steps of cyclically loading backup roll in rolling stand and performing heat treatment of it for determining intensity degree of strain hardening of roll according to increased hardness of its barrel. In order to enhance efficiency of rolled sheet production process after (0.1-0.3)10⁶ loading cycles maximum value of hardness increase along the whole length of roll barrel is determined according to relation: N=k ΔHV_max, where N - number of loading cycles before heat treatment, k -proportionality factor equal to (0.08-0.15)10⁶ for chrome steels, ΔHV_max- maximum value of hardness increase by Vickers along the whole length of roll barrel. In variants of invention heat treatment is realized by heating up to 110-130 C, seasoning at such temperature for 22-26 hours or by aging backup roll at 5-35 C for 5-6 days. EFFECT: enhanced strength of rolls. 3 cl, 1 tbl