COMBINATION TYPE CONTINUOUS SCREW AND LENGTHWISE ROLLING METHOD Russian patent published in 2006 - IPC B21B19/02 B21B1/02 

FIELD: rolled stock production, namely method of combination continuous screw and lengthwise rolling.

SUBSTANCE: method comprises steps of deforming blank outside rolls by twisting it between adjacent stands of screw and lengthwise rolling. Out-of-rolls deformation of blank by twisting is realized in screw rolling stand while arresting rotation of blank at outlet from rolls by means of roller guide. Value t of radial reduction of blank by means of non-driven holding rollers of roller guide is selected in interval t = {a, b} where a = 0.52d₁ ^1.5/D^0.5/m₁; b = 0.35 d₁(m tg α/ tgγ)^1/3 ( (λ -1) (1 -2n_δ tg α)/m₁/n_1δ)^2/3 where t - radial reduction of blank by means of non-driven holding rollers, mm; d ₁ - diameter of rolled piece at outlet of rolls of screw rolling stand, mm; λ - elongation degree in screw rolling stand; m - number of working rolls in screw rolling stand; γ -angle of roll feed, °; D - diameter of non-driven holding roller, mm; m₁ - number of non-driven holding rollers; n_δ - coefficient of stressed state at screw rolling; n_1δ -coefficient of stressed state at lengthwise rolling.

EFFECT: enhanced stability of combination rolling process, high level of mechanical characteristics along the whole length of blank.

2 dwg, 1 tbl