According to the new method, the caliber is built so that during the entire rolling process, the convex shape of the head and its side faces are constantly preserved, and their deformation was always carried out under direct pressure. The first pass is made in a universal tick with four rolls. Small leg of the rail is profiled with horizontal rolls. On the side faces of the rail head, a bruise occurs. After leaving the universal tick, the draft profile enters the vertical two -vale cage, which processes it, eliminating the bruis that occurs during previous rolling.
The draft tackle required for the first passage according to the method under consideration is rolled by classical calibration for 4-5 passes on a reverse two -valve or three -valve, which is installed before universal stories. The final passage is made in the ticks, in which the head and vertical leg of the rail are deformed between horizontal rolls, while the railway is squeezed with vertical rolls located on the side.
The rental camp used to obtain rails according to the method under consideration consists of ordinary mechanisms used in many well -known rental camps. Its specificity lies in the nature of the location and management of individual units of equipment. On this camp, you can make rails with a wide sole, groove rails, beams with parallel shelves, standard beams, asymmetric profiles. At the beginning of the line, there are two two -wool reversing ticks or three -wool conventional structures, on which black profiles are made for continuous rolling on universal cages.
This rolling line belongs to interchangeable universal ticks with four rolls and two -wool cages. Universal cages are brought from non -renewal DC electric motors with an adjustable rolling speed. Two -vulgar strokes are irrelevant, they rotate through the workpiece emerging from the drive universal stories. Since these cages provide for very small compression, a special drive is not required for them. Chistova Cat differs from universal strokes only in that it is installed on a rotary disk. After wear of the final caliber, it changes by turning the entire Cite by 180 °. When rolling a symmetrical beam profile, the workpiece is passed several times between the rolls, the gap between which everything is reduced until the final profile with inclined shelves will be obtained. In the last tick, only a final pass with a small squeezing is made, while the shelves are straightened again, which allows you to get an accurate final profile.
