METHOD FOR COLD ROLLING OF STRIP IN MILL WITH FOUR-HIGH STANDS DRIVEN THROUGH BACKUP ROLLS Russian patent published in 2003 - IPC

Abstract RU 2210443 C2

FIELD: metallurgical industry branches, namely processes for cold rolling of strip in wide-strip cold rolling mill having four-high stands with main drive through backup rolls. SUBSTANCE: method for cold rolling of strip in mill with four-high stands driven through backup rolls at emulsion lubricating of rolls during rolling process comprises steps of controlling in separate stands of mill such parameters as reduction and(or) tension values while taking into account known beforehand parameters such as diameters Dr, Db of rolling and backup rolls respectively; length Lb of barrel of backup rolls; length of slopes of barrels of backup rolls; diameters d_b.r, d_b.b of bearing units of rolling and backup rolls respectively; horisontal shift of axis of rolling rolls relative to axis of backup rolls in rolling direction Xr; friction coefficients f_r, f_b in bearing units of rolling and backup rolls respectively; in addition taking into account parameters measured directly at rolling process, namely: power Ndr consumed by electric motors for rotating driven rolls, angular velocity ω_p of rolling rolls, rolling effort P, thickness h₁ of rolled piece, thickness h₀ of initial blank, back tension To of strip, front tension T1 of strip; at rolling process measuring in addition concentration C of emulsol in used emulsion; using above mentioned parameters calculating tgβ being tg of inclination angle of interroll effort relative to axial plane of rolls and coefficient f₀ of rest friction at roll contact according to empiric dependence; then for each stand of mill testing if condition tgβ<0,9f₀ is satisfied; when said condition is not satisfied at least for one stand, increasing reduction value in said stand and(or) increasing front tension or lowering back tension of strip in said stand. EFFECT: elimination of emergency state of mill caused mutual slipping between rolling and backup rolls at rolling process.

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RU 2 210 443 C2

Authors

Garber Eh.A.

Gorshkov I.K.

Ermilov V.V.

Dates

2003-08-20—Published

2001-10-18—Filed