Method for manufacturing unequal thickness steel pipe

Abstract

A method for manufacturing an unequal thickness steel pipe comprises: firstly, a thin steel plate (1) and a thick steel plate (2) that have different thicknesses are connected as an unequal thickness steel plate by welding; secondly, a roller machine is used to pre-roll two external ends of the thick steel plate and the thin steel plate that are constituted of the unequal thickness steel plate; through reciprocating roll of a lower roll wheel (3) and an upper roll wheel (4), two ends of the unequal thickness steel plate are rolled to warp upwardly; thirdly, areas except the two warped ends of the unequal thickness steel plate are rolled to make the steel plate gradually roll as a pipe shape; fourthly, misaligned edges (6) at two end ports of longitudinal seams (5) that are about to be closed and misaligned edges (7) of an outer round camber at two ends of the abutted unequal thickness steel plate are rectified and welded and the longitudinal seams are abutted, thus forming an unequal thickness steel pipe; Lastly, the roundness is rectified. According to the invention, the existing conventional roller machine is adopted to roll the unequal thickness steel plate as an unequal thickness steel pipe with arc shape.

Description

technical field [0001] The invention relates to the field of steel pipe processing, in particular to a method for processing steel pipes of unequal thickness. Background technique [0002] Steel tube processing, especially the processing of wind power tower tubes, generally adopts coiled tube technology. The processing of wind power tower tubes has always been made of steel pipes with equal wall thickness. In recent years, in order to save costs, steel pipes of unequal thickness are designed. Most of the wall thickness of the steel pipes are made of thin plates, and only thick plates are required for the parts where the door frame is installed. But existing roller machine is all designed according to coiling equal-thickness steel pipe, and existing coiling technology all is to adopt equal-thickness steel coiling steel pipe. [0003] The thickness of the wind power tower is determined by two factors, one is the structural strength requirements of the tower, and the other is...

AI Technical Summary

Problems solved by technology

After the rolling is completed, they are welded together to form cylinders of unequal thickness. There are problems such as complicated procedures, difficult butt welding, and difficult round calibration.

Images