Computer automatic control, according to the steel grade, wall thickness, plate width automatically adjust the reduction, reduction force and steel plate feed, the upper and lower grinding tools have automatic deformation compensation function,Using the stepping JCO forming method, half of the pre-bent steel plate is gradually bent from the edge to the middle of the plate on the forming machine with the set step length and number of times, and then the other half of the steel plate is also bent to form an open "O" shaped steel pipe.