Roll bending forming method and device for straight edges of to-be-welded pipe

Abstract

The invention discloses a roll bending forming method for straight edges of a to-be-welded pipe. The roll bending forming method comprises three steps of preforming, roll bending and reshaping; preforming is completed by a leading-in mould; roll bending is completed by a roll bending mould; reshaping is completed by a leading-out mould; and the leading-in mould, the roll bending mould and the leading-out mould are installed on the same equipment through a mould frame, and are driven by a motor, and thereby, integrated roll bending forming of the straight edges of the to-be-welded pipe is realized. The roll bending forming method is high in forming precision and high in consistency and stability and increases production efficiency.

Description

technical field [0001] The invention belongs to the technical field of steel pipe processing, and in particular relates to a straight edge roll bending forming method for the edge of a pipe to be welded. Background technique [0002] Long straight welded pipes are widely used in natural gas, oil and other pipelines. Generally, the production of long straight welded pipes is realized by a plate rolling machine. However, due to the limitation of the plate rolling machine, there must be two straight sides on the edge of the coiled pipe to be welded after the plate rolling is formed. At present, there are mainly two methods for processing the straight edge of the coiled tube. One is to close the remaining straight edges on both sides of the coiled tube and weld the joint to form a flat plate; straight edge. The method has low productivity, high production cost and long production cycle. Another method is to directly cut off the straight edge manually. In this way, there will ...

AI Technical Summary

Problems solved by technology

This method has low productivity, high production cost and long production cycle

Another method is to directly cut the straight edge manually, so that there will be uneven groove when cutting the straight edge, and the relative gap of the longitudinal weld is not easy to ensure

In addition, the width of the reserved straight edge is not easy to grasp, and the phenomenon of incomplete elimination of the straight edge is prone to occur, which wastes a lot of pipe materials, increases the cost, and affects the production efficiency

[0003] The existing roll forming method has several problems: (1) continuous roll forming cannot be realized, the forming efficiency is low, and it is difficult to realize industrial promotion; (2) the shape and size of the product cannot meet the radian requirements through one-time forming, and the product Low precision; (3) The process stability is poor, and the center of gravity of the steel pipe is easy to shift during the roll forming process; (4) The versatility is poor, due to the limitation of the mold, only a certain type of pipe can be rolled and formed; (5) The mold input Large, complex structure, increased input costs

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