Method for manufacturing variable curvature cold bent pipe

A manufacturing method, technology of cold-bending pipes, applied in the field of mechanical product manufacturing

Inactive Publication Date: 2011-05-04
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the manufacturing process of cold-formed pipe adopts a single curvature processing technology, which is difficult to meet the above requirements at the same time

Method used

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  • Method for manufacturing variable curvature cold bent pipe
  • Method for manufacturing variable curvature cold bent pipe
  • Method for manufacturing variable curvature cold bent pipe

Examples

Experimental program
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Embodiment Construction

[0017] For example: to bend a steel pipe with a length of 12m and a diameter of 1016mm, and the straight pipe sections at both ends of the cold-bent pipe are both 2m long, so the effective bending length of the steel pipe is 8m. The variable curvature manufacturing process is used for bending. The commonly used cold-bent pipe construction specification stipulates that the radius of curvature is greater than 40D. Based on this, the 600mm pipe section near the pipe end is selected to be bent with a curvature radius of 60D. The adjacent 900mm pipe section Bending with a radius of curvature of 50D, and the middle section of the steel pipe with a radius of curvature of 40D, such as figure 2 shown.

[0018] use figure 2 In the variable curvature bending method shown, the bendable angle within the effective bending length of 8m is 10.2°, while the Φ1016mm cold-bent pipe for oil and gas transportation generally does not exceed 10°, so the variable-curvature cold-bend pipe and its m...

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Abstract

The invention relates to a method for manufacturing a variable curvature cold bent pipe, which comprises the following steps of: (1) starting cold bending, namely performing bending by adopting a curvature radium of 45D to 60D at a cold bending start part in 2 meters apart from the pipe end; (2) after the bending length reaches 1.5 meters, performing bending by adopting a curvature radium of 40D; and (3) when the bending is performed to 3.5 meters apart from the other pipe end, and completing the bending of the whole steel pipe. Because of small curvature at the pipe end of the bent pipe, the ellipticity of the pipe end can be ensured; because the part of the pipe body apart from the pipe end is bent by adopting large curvature, the manufacturing efficiency can be improved, and the bent pipe with large angle is manufactured in an effective bending length can be ensured; and by the bending process, the appearance quality and manufacturing efficiency of the bent pipe are guaranteed.

Description

technical field [0001] The invention belongs to the field of mechanical product manufacturing, and relates to a manufacturing process applicable to cold-bent pipes for oil and gas transportation pipelines. Background technique [0002] Cold-bending pipe is to directly physically bend the steel pipe according to a certain radius of curvature to obtain a bending angle that meets the requirements, so as to adapt to the change of the line direction during pipeline construction. This is widely used in long-distance oil and gas pipelines. [0003] There are many ways to process cold-bent pipes. For the bending of small-diameter and thin-walled pipes, methods such as winding, rolling and pushing can be used. For example, the Chinese patent with the publication number CN2762912Y discloses a thin-walled pipe with variable curvature push The main technological feature of the mold used in the bending process is to apply a vertical end thrust to the end of the steel pipe, and use the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D7/00
Inventor 池强刘迎来吉玲康王鹏张坤义马明来
Owner BC P INC CHINA NAT PETROLEUM CORP
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