The UOE process, the methods of sheet metal bending process which is used for pre-bending a steel sheet, U (U-ing) forming, O molded O-ing) and the enlarged diameter (Expanding) combining successive processes forming method, production efficiency significantly higher than other production processes, while forming accuracy can be guaranteed, so it is seam welded steel pipe products Dazhi a good production process.

UOE straight seam welded steel pipe forming process is: raw material inspection - a material, planning - pre-curved shape -O -U forming - welding - cold expanding - full circle - mechanical repair end. UOE equipment used includes planing machine, plate edge pre-bending machine, VER-SON-U molding machine, VERSON-O-forming machine. To ensure the overall performance of welded steel pipes, pipe material selection OS F101 415IF feeding a furnace, hot-rolled production block.

(1) planing

The aim is to steal processed into the desired width, but also to ensure that steel has a certain groove and blunt edge to meet the requirements of the welding process.

(2) Flange

O formed in the plate on the press molding, it is generally in the circumferential direction at a compression ratio of less than 1% of the processing, if not the curved side, the edge portion of the steel sheet tends to remain a linear segment, not a good tube.

(3) U shaped

After steel flange into the next step after that U shape. U forming presses has Kaiser type, Mannesmann type and Wilson type. In this product trial, using a Wilson-type presses, presses for Wilson-type rocker mode, which is combined on the die. Prevented when the side of the indentation forming, and to achieve the optimum U-shape. U uninstall end after deformation at the rebound effect, deformed steel and die disengagement.

(4) O forming

The u-shaped plate is then sent to the press O. O in sheet metal bending process, the O-type presses equipped with two semi-cylindrical die outside of the mold are active mode, lower mold does not move.

(5) hydraulic expanding

U, the O shape, after welding, welding the inner and outer welding, the shape of the steel plate become the dense tubular container, and then through the non-destructive testing processes, the next step is forming the steel pipe.