UNIVERSAL FOUR-ROLL STAND FOR SHAPING TUBES Russian patent published in 2003 - IPC

FIELD: plastic metal working, namely manufacture of shaped straight-seam steel tubes. SUBSTANCE: stand for shaping tubes with maximum outer diameter d_t includes arranged in one diametrical plane and mounted in chocks with possibility of motion in said plane pairs of idle horizontal and vertical rolls with rectilinear generatrix of working surfaces and with the same diameter equal to (3.2 - 4.0)d_t. Chocks are arranged in four G-shaped supports fastened by means of two rings at inlet and outlet of stand and mounted on supporting plate with possibility of its adjustment motion normal relative to shaping axis in vertical and horizontal directions. Lower horizontal roll may perform such motion only in vertical direction in range Δ = (D-d):2, where D and d - maximum and minimum diameters of roll, respectively. One of vertical rolls is joined by its end face with working surface of above mentioned roll and it may be moved only in horizontal direction. Second vertical roll joined with end face of lower horizontal roll by its working surface and upper horizontal roll may be moved by predetermined distance in vertical and horizontal directions. Upper horizontal roll is joined by its end face and working surface with vertical rolls. EFFECT: lowered labor consumption at making shaped rectangular and square cross section tubes of round welded tubes with the same high quality due to simplified design of rolling stand and decreased roll wear. 2 dwg, 1 ex