FIELD: transport.
SUBSTANCE: invention is intended for rolling two-head rail joint bars featuring a web with heads on its sides made over the width of the cross-section and ledges reinforcing the heads and arranged on the head opposite side. The method includes a multi-pass squeezing of slugs in grooved rolls. The reshaping is effected in an open beam-type roughing pass with a significant width of flanges. After canting the work piece by 90°, it is first swaged out in a box pass, then rolled in an open forming pass performing the shape of heads and reinforcing ledges and, finally, the shape is formed in three closed-type forming passes with sequential alternation of pass parting.
EFFECT: improved manufacturability, higher efficiency of rolling mill, reduced wastes.
1 dwg, 1 ex
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