FIELD: tools for die rolling of cone elongated hollow metallic articles by hot rolling of cylindrical tubes in pilger mills at lowered diameter and wall thickness from one end of tube to other.
SUBSTANCE: roll for die rolling includes along circle of its barrel round cross section groove with outlets. Length of said groove includes successively arranged striker formed by radius of roll ridge of increased length, having constant angles of cross outlet in one third of striker length and smoothly lowered in its remaining part till outlets of polishing portion ( radius of roll ridge in end of portion with constant value of cross outlet consists 1.3 of radius of roll ridge in the beginning of said portion), polishing portion with constant radius of roll ridge, transition portion and idle portion. Round variable groove pass with cross outlets is arranged along helical line on cylindrical surface of roll with ideal diameter. Number of pitches of helical line is determined as n = (L sin α)/(2πRr) + B + B1 , where L - length of cone article, mm; Rr - rolling radius of roll, mm; α -inclination angle of axis of roll grooved pass relative to axis of roll, °; B - length of idle portion at inlet equal to (0.20 - 0.25)n; B1 -length of idle portion at outlet equal to (0.10 -0.15)n. Semipass of upper roll has left-hand and semipass of lower roll has right-hand direction of helical line or vice versa. Groove of roll is half round one with cross tangential or oval outlets with angles 30 - 32°. Values of said angles are constant ones, they are equal to 30 -35° for central angle and they are smoothly decreased to outlet cross section to 20 - 18°.
EFFECT: possibility for making by hot rolling cone elongated hollow metallic articles having improved strength at significantly lowered mass, reduced cost of articles.
4 cl, 1 dwg
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