FIELD: metallurgy.
SUBSTANCE: method includes broaching of blank into bushing, following rolling of bushing on reeling machine by rollers with comb with opening of rollers at rolling of back end. Rolling-off of bushing in reeling machine is implementation parallel plug of length, equal to 2.0-3.0 the length of deformation region. Mandrel since the moment of capture of bushing by rollers in deformation region is alternate displaced at a rate 0.02-0.1 of rolling velocity. Mandrel is held on outlet side, and its movement in both directions from clamping of rollers is restricted by distance, not exceeding double length of deformation region.
EFFECT: reduction of longitudinal polythickness of pipes excluding formation of trihedron at back end of pipes, reduction of mandrels consumption and productivity boosting.
1 ex, 3 dwg
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