METHOD FOR BENDING THIN-SHEET ANGULAR SHAPE Russian patent published in 2000 - IPC

FIELD: plastic metal working, possibly manufacture of package for sheet material. SUBSTANCE: method comprises steps of setting on shape point through which bending line is to be passed; weakening bending region by providing two deformation zones; arranging first deformation zone normally relative to flange of shape and arranging second deformation zone with inclination relative to first one; rotating shape portions around bending line for creating protruded portion in bending zone; then bending up protruded portion until plane of flange of angular shape towards inclined deformation portion. EFFECT: enhanced fluid-tightness of bending zone, elimination of excess deformation in it. 5 dwg, 1 ex