in twenty-first Century, the majority of enterprises in the idea of trying to use machinery to replace increasingly tight labor resources, coupled with the market is more and more strict requirements for products, for pipe products, products of roundness, straightness and parallelism, appearance and microstructure are the increasingly high demand, more and more enterprises have chosen the winding bend forming machine, single head hydraulic bending machine or CNC bending machine.Now the domestic and foreign commonly used pipe bending type is diverse, there are pure mechanical, hydraulic, pneumatic, medium frequency induction heating type, etc.. Tube bending is made directly by a special mold.