METHOD OF ROLLING RAILS Russian patent published in 2019 - IPC B21B1/08 

FIELD: transportation; technological processes.

SUBSTANCE: invention relates to rolling of railway rails at rail rolling mills equipped with continuous-reverse set of stands. Method involves production of initial rail billet in duo-reversing stands, its further rolling in continuous-reverse group of stands in three passes, where in the first and second passes formation of the profile is carried out in the following sequence: universal four-roll gauge – auxiliary two-roll gauge – universal four-roll gauge, and in third pass: universal four-high-speed gauge – auxiliary two-roll gauge – finishing universal three-roll gauge, where universal rolls of universal four-roll and final three-roll gauges are made with slopes to vertical of side faces forming internal faces of flanges of profile bottom. Possibility of improvement of straightness, geometry of profile and mechanical is ensured by the fact that in the third pass the profile is further formed with a pre-clean universal four-roll gauge according to the scheme including the following sequence: universal four-roll gauge – two-roll auxiliary – pre-clean four-roll gauge – finishing three-roll gauge, at that, the value of the slopes of side faces of horizontal rolls of universal four-roll gauges, including those of pre-cleaning, is 1.14÷1.30 of slope value of corresponding lateral faces of horizontal rolls of finishing three-roll gauge.

EFFECT: possibility of improving straightness, profile geometry.

1 cl, 12 dwg