Method and equipment for flexible forming of straight seam submerged arc welded pipe

Abstract

The invention discloses a method and equipment for flexible forming of straight seam submerged arc welded pipes, belonging to the technical field of straight seam submerged arc welded pipe forming; and provides a method for flexible forming of straight seam submerged arc welded pipes with low equipment price, easy forming, and little damage to steel pipes and equipment; the center is fixed and the edge is extruded. First, two curved edges are extruded through a flat roller frame, and then gradually extruded into a U shape through four four-roller frames, and then four C-shaped vertical The roll frame is extruded into a C shape, and finally it is extruded into an open O shape through two four-roller frames. It is a device made according to the above method. Its structure is: according to the order in which the steel coils enter: the first One flat roll frame, the first four-roll frame, the second four-roll frame, the third four-roll frame, the fourth four-roll frame, the first C-type vertical roll frame, the second C-type vertical roll machine frame, the third C-type vertical roll frame, the fourth C-type vertical roll frame, the fifth four-roller frame and the sixth four-roller frame; the present invention is applied in the technical field of longitudinal submerged arc welded pipe forming.

Description

technical field [0001] The invention discloses a method and equipment for flexible forming of a straight seam submerged arc welded pipe, belonging to the technical field of straight seam submerged arc welded pipe forming. Background technique [0002] The existing LSAW pipes are mainly formed by the UOE production process: the UOE production process uses a large press (above 16,000 tons of pressure) to press the steel plate that has been cut into a certain size into a U shape through a mold, and then uses the second Two large presses (more than 20,000 tons of pressure) press the U-shaped tube embryo into an O-shaped tube through the mold, and then use the submerged arc welding machine to spot weld the steel tube, and then perform internal welding and external welding to finally form a steel tube. [0003] This production process has the disadvantages of huge equipment, high energy consumption and huge investment. Thereby the cost height that causes steel pipe, selling price...

AI Technical Summary

Problems solved by technology

[0005] This production process has the disadvantages of huge equipment, high energy consumption, large investment and low efficiency

As a result, the cost of the steel pipe is high, the selling price is high, and the market sales are restricted.

Especially when making steel pipes with small and medium diameters, the price is very high, and the sales market is greatly affected.

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