TWO-ROLL SHEET BENDING DEVICE Russian patent published in 1995 - IPC

FIELD: mechanical working of metals. SUBSTANCE: machine has rigid mandrel roll 3 and driven forming roll 2 with elastic coat mounted in a bed 1. An open slot extended along the roll generatrix is filled with insertion 5 of flexible material. Two pairs of supports 9 and 10 control insertion. Two-position supports 10 get turned to 180 degrees during manufacturing pipe pieces with circle length less than length of cross arc of forming roll 2. In this case rollers 8 mounted on shafts get on supports 10 steps 11 and insertion 5 does not drop into the slot 4. This provides pipe pieces shaping of mentioned diameters within one revolution of a roll. Insertion usage permits bend pipe pieces of the whole diameter range and it broadens machine processing capacity. EFFECT: enhanced efficiency. 2 cl, 5 dwg