FIELD: metallurgy.
SUBSTANCE: roller contains input and output cones, and cylindrical part with screw thread. The input cone contains guide cone with length 0.06 L of roll body L and piercing cone containing cone of initial and cone of secondary clamps, screw thread on the roller cylindrical part is made with pitch 95 mm and inclination angle to roller axis 3°37', and output cone contains reeling mandrel with length 0.21 L with cone angle αr = 6°, cylindrical part and cone of sleeve exit from rollers with length 0.11 L and cone angle αr = 3°. Cone of the blank initial clamping is made with length 0.17 L and cone angle α1n = 4°, between the cones of initial and secondary clamping a groove is made with radius 60 mm and length 0.04 L with smooth transition from cone of blank initial clamping to the cone of secondary clamping, the length of cone of the secondary clamping is 0.10 L with cone angle α2n = 8°, length of the cylindrical part of the roll with screw thread is 0.21 L, and length of cylindrical part of output area of the output cone is 0.11 L.
EFFECT: reduced curvature of sleeves, transverse and longitudinal wall thickness variation in pipes, exclusion of re-heating.
1 dwg, 1 tbl
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