METHOD FOR MAKING DIFFERENT-FLANGE BENT Z-SHAPED SECTION Russian patent published in 2000 - IPC

FIELD: rolled stock production, possibly manufacture of cold bent Z-shaped relatively small sections in light type bending mills. SUBSTANCE: method comprises steps of guiding blank to roll passes for bending edge members of strips and inclining relative to horizon mean portion of strip cross section for making web and different-width flanges. Blank is guided to first roll pass with inclination by angle α. relative to horizon. In all next roll passes mean portion of blank cross section is inclined by the same angle α. Angle value α is determined according to given expression. At forming larger flange, edge members of blank are bent upwards, at forming smaller flange - downwards. Edge members of blank are bent by the same angle in all passes. Bending zone between web of section and its large flange is arranged in shaping level along the same straight line parallel relative to shaping axis. EFFECT: lowered wear of rolls, enhanced quality of bent sections. 2 cl, 1 dwg, 1 ex