BENT SECTION PRODUCTION METHOD Russian patent published in 1995 - IPC

FIELD: metal pressure forming. SUBSTANCE: method comprises steps of making a bent section, having asymmetrical configuration of its cross section, with one flange to inside and other flange, turned to outside, five bending zones, providing four convex and one concave three-member portion, the last portion being fifth bending zone in direction to inside from the flange; performing rotation of a web of the section, joined with its third and forth bending zones in direction to inside from the flange in technological shaping transitions relative to an apex of the third bending zone of the section from its any flange in direction, opposite to a direction of flange bending up, in order to provide in the last transition a final rotation angle, whose value is being calculated according to a given relation. EFFECT: enhanced quality of complex-shape bent section. 1 cl, 7 dwg, 2 tbl