... touch screen, 3,pre-bending of high precision,rich bending shapes such as O,U 3 roller rolling machine Which is thicknss more ... .Top roll can does vertical and level motion, up and down, parallel translation is display. This machine include pre-bending function. ... self-aligning bearing .two cylinders provide the pressure for upper roll bending , main cylinder working pressure is 20 Mpa ,max pressure ...