Pre-bending process of straight seam submerged arc welded steel pipe production line

Abstract

The invention discloses a pre-bending process for a longitudinal submerged arc welding pipe production line. According to the process, operation is carried out on a longitudinal steel pipe welding pre-bending device; the longitudinal steel pipe welding pre-bending device comprises conveying roll tables which are arranged in parallel, a sucker hoisting conveyor is arranged at the upstream of the conveying roll tables, and a steel pipe pre-bending forming machine is arranged at the downstream of the conveying roll tables; the sucker hoisting conveyor comprises a hoisting cross beam and a vacuum sucker; and the steel pipe pre-bending forming machine comprises a pre-bent upper mold, a pre-bent lower mold and a pre-bent fixture. The process comprises the following steps: a feeding step in which the upper surface of a pre-bent steel plate is sucked by the vacuum sucker to move toward the downstream of the conveying roll tables; a bending step in which the pre-bent upper mold and the pre-bent lower mold of the steel pipe pre-bending forming machine make forward motion; and a resetting step. Relative sliding and friction between the pre-bent steel plate and conveying equipment can be reduced in the pre-bent steel plate feeding process, scratches generated on the surface of the pre-bent steel plate can be avoided, and the anti-rust and anti-corrosion capability of a longitudinal steel pipe can be improved.

Description

Technical field [0001] The invention relates to a pre-bending process for a straight seam submerged arc welded steel pipe production line, and belongs to the technical field of straight seam welded pipes. Background technique [0002] Steel pipes made by welding hot-rolled or cold-rolled steel plates or steel strip coils, in which the steel pipes obtained by longitudinal welding on the welding equipment are longitudinal welded pipes, and the welds of the longitudinal welded pipes are in a straight line. Longitudinal welded pipes are widely used in water supply engineering, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, urban construction; for liquid transportation: water supply and drainage; for gas transportation: coal gas, steam, liquefied petroleum gas; for structure Uses: used as piling pipes and bridges; pipes for docks, roads, and building structures. [0003] The main production process of large-diameter straight seam welded pip...

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Problems solved by technology

[0004] The feeding process of the conventional pre-bending process mostly adopts the method of steel sheet coil rotation combined with the rolling friction of the conveying roller table. In the above feeding method, the power motor used to drive the rotation of the central axis of the material coil is required to be large; The sliding friction between the road and the steel plate will not only cause scratches on the surface of the steel plate, affect the anti-rust and anti-corrosion ability of the steel plate, but also shorten the service life of the conveyor roller table

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