1).roll bending machine 2).Pre-bend end plates 3). ... certicated Main characteristicHigh-precision end of the pre-bending, set the length of the straight edge freely ... have asking a roller to coordinate adjustment ,continuous bending on time of roller lower part, this one ... O-bending : bending the back way; U-bend: the way forward bending. Bend with type R,ways of combination. cnc roller bending machine