BENDING DEVICE WITH SWING EXPANDING ROLLERS Russian patent published in 2009 - IPC B21D7/08 

FIELD: machine building.

SUBSTANCE: invention is related to machine building and may be used for sectional bars bending by rollers. Bending device for bending of closed, semi-opened and opened hollow sectional bars comprises central roller for adjacency to internal side of bent sectional bar, expanding roller for adjacency to external side of bending, bending roller for location on the side of sectional bar rise and effect at external side of bending, opposite to which support rollers are installed, expanding rollers that are located opposite to each other in plane that is perpendicular to plane of bending for effect at upper and lower lateral walls of sectional bar arranged with possibility of swinging, and holder for sectional bar placement. Expanding rollers are arranged with the possibility to direct material flow that occurs in external end wall of sectional bar bending, through appropriate lateral walls into internal end wall of sectional bar bending.

EFFECT: provides optimal deformation of sectional bar without disruption of material continuity.

25 cl, 12 dwg