3 roll plate bending machine pre-bending competitive price PLC system 3 roll plate bending machine1, pressure 160 ... straight length of the terminal≤ (2 ~ 2.5) times over the thickness 6, diameter of the upper roller Φ375 ... 9, rolling speed about 3.5 m / min 10,speed of the upper roller under pressure about ... 120 mm / min11, number of the support rollers 4 pieces12, number of carrier roller ...