METHOD FOR PROFILING CUT-THROUGH ANGLE Russian patent published in 2000 - IPC

FIELD: plastic metal working, namely manufacture of cold bent angular cut-through shapes. SUBSTANCE: method comprises steps of successive bending of flanges and shaping bent portions between said flanges in rough, intermediate and final passes, limiting crosswise motion of shaped piece only in rough pass; setting bending up angle values equal respectively to 20, 40 and 46 degrees; at final pass cutting-through angular shape according to predetermined configuration and size in place of bending shape while maintaining constant angle between bent up flanges. EFFECT: lowered cost for making angular shapes with cut-through bent portions, enhanced quality of angular shapes.