Longitudinal seam welded pipe roller bending forming generally subject to three basic bending process: open a real bend, bend freely open, closed liberal bent. As online IF normalizing process matures, more and more to Longitudinal production of large-sized, thick wall, in the direction of high-grade steel, in some industries were previously part of seamless steel tubes, such as the automotive transmission pipe, boiler pressure pipe, oil casing, oil and gas feed pipe, high grade, high quality welded pipe is being adopted on a large scale, a lot of energy to replace the seamless steel pipe. At the same time, large size, thick walls, high grade product features, for welded pipe roll forming also made increasing demands.
Until now, curved molding process pipe unit has been in constant progress, nearly fifty years, curved molding experienced technical progress in three stages: the continuous bending method – arc crimping method – a combination of molding. Continuous bending method is to start from the edge of the curved portion of the tube, continuous curved starting from the edge to the center, curved molding units are used in the traditional method of continuous curved; arc crimping method is the entire length of the tube as a whole bending, bending curvature lane descending order, bent row roll forming process unit is used in arc bending method; molding method is a combination of the edge portions of the continuous curved tube, the middle section and the connecting section of the tube’s for circular bending, bending FFX molding machine used is a combination of bending method.
Post time: Dec-28-2020