FIELD: metal forming. SUBSTANCE: method of making shapes, mainly angular ones, comprises steps of preliminary bending of a strip with formation of a flat portion on a mean part of the strip width with two transitional curvilinear portions between members of a blank, final bending of the blank by applying normal and tangential efforts to its members; upon the process of the preliminary bending of the strip providing an additional formation of straight rectilinear portions on edges of the strip, parallel with the rectilinear portion, arranged in the mean part of the strip, with two additional transitional curvilinear portions between members of the blank in such a way, that length value of the above mentioned parallel portions decrease as degree of finishing the shape increases. EFFECT: metal economy, consisting at an average 1.46 kg/m of the metal, upon sustaining strength characteristics of the shapes. 1 cl, 1 dwg
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Authors
Dates
1996-04-10—Published
1992-10-20—Filed