... 4 roller bending machine This four rolls bending machine used to coil plate into different sharps. Hydraulic 4 roller bending machine This four rolls bending machine used ... edge once, compare with 3 rolls machine, no need to press machine to do pre-bending.The control system adopt OMRON ... precision, excellent airproof, without leakage.Equipment cone bending device. Hydraulic 4 roller bending machine