Square tube bending machine is composed of main body, down roller, supporting roller, mould, transmission part, NC digital display, electrical system and hydraulic system.
Main body of this machine is steel plate welding structure, three-layer steel plate, base plate and boarding plate weld together to form two cavums. the front cavum is used to fix down roller , while the back one is used to fix transmission part , all steel plates are solved through following process：anti rust , bevel cutting for continuously welding , whole annealing and anti-stress before welding for good rigidity ,capacity to resist distortion and long time work under full load .
Upper roller is fixed on the body, both heads are supported by double line of spherical roller bearing, this structure has high load capacity and good rigidity.
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