FIELD: heating systems.
SUBSTANCE: invention is intended for tube fabrication and can be used for heating boilers. Manufacturing method of heat exchange tube by applying extrusions to tube shell of restricted length involves movement of tube between annular channels with two pairs of working rollers rotating simultaneously in mutually perpendicular planes, the rotation axes of which are located in one and the same plane. Rollers have shaping projections above channels surface, which are arranged with specified pitch. Shaping projections of the pair of working rollers rotating in one and the same plane are located with angular displacement relative to the shaping projections of the other pair of working rollers.
EFFECT: increasing capacity during fabrication of tubes of restricted length.
4 cl, 4 dwg
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