FIELD: mechanical engineering. SUBSTANCE: device has upper punch 10 in the form of a knife reciprocating relative to bed 2 crosswise to the sheet plane. The punch is also rotatable and is located opposite to two plate lower punches 19, 20 which are rotatable relative to a common axle passing in the bending zone of sheet 18. Rack-and- gear drive 24 is used for punch rotation, upper punch 10 is pressed in the working position to the surface of bent sheet 18 and when bending forms a stationary counterpunch around which sheet 18 is bent by lower punches 19, 20. EFFECT: improved structure. 9 cl, 26 dwg
