FIELD: plastic metal working, namely manufacture of bent box shapes. SUBSTANCE: method comprises steps of successive bending up closing flanges and lateral flanges of shapes in rough, intermediate and finish passes and partially unbending lateral flanges in finishing pass up to 90 degrees; providing 15 degree increment of bending angles of closing flanges at making shape of strip blank with thickness 5 - 8 mm in rough passes and disengaging tool and strip in two intermediate passes; unbending closing flanges by 0.5 degree when angle between said closing and lateral flanges achieves 70-72 degrees; providing maximum bending angle of lateral flanges equal to 20 degrees, rebending said flanges by 2- 3 degrees in first finishing pass according to manufacturing process and unbending them beginning from second finishing pass. EFFECT: enhanced efficiency. 1 dwg
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