Mechanical properties: 1.full-automatic transmission, compact structure, high reliability; 2.Three-roller transmission is not easy to slide. The thin-wall material also may be bended. 3.The rollers on both sides are distributed asymmetrically, reducing linear part. 4.Both the sides of the side roller can be used for feeding workpiece. 5.The double-footplate switch is equipped with emergent stopping system for operating conveniently. 6.This machine drives stably. Only regulate the side roller up and down can get round, arc or spirality of different curvatures. 7.If change mould’s shape, various metal shaped materials can be processed, like angle iron, flat steel, round steel or other special shaped material 8.It avoids the shortcomings of making super large tube bending mould while bending the large-radius shaped material, which is a necessary complementarity that series single-head, double-head tube benders can not reach. 9.Being of high speed and high benefit, this machine is adapted for middle or large batches production.