METHOD OF MAKING BENT SHEET PARTS Russian patent published in 1994 - IPC

FIELD: metal pressure forming. SUBSTANCE: method comprises steps of comparing a predetermined and a fixed shapes of surfaces of a die set and detecting their difference according to "indicatrisse of Dupene", indicating a necessity of placing a liner on a surface of the die before bending process; after bending performing an operation of trimming allowances. The method allows to make practically any desired-shape parts with use of the same die set. EFFECT: enlarged using range. 2 cl, 2 dwg