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Forming technology for welding neck flange

A forming process and long-necked flange technology, which is applied in the field of steel pipe processing, can solve problems such as abnormal stress concentration, short service life, sharp corners of welding edges, etc., and achieve the effects of improving strength and toughness, improving connection strength, and avoiding excessive stress concentration

Inactive Publication Date: 2018-11-06
江阴市天柠管道有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Long neck flanges are mainly used for the continuous laying of large-diameter pipelines. The manufacture of existing long neck flanges is mainly to weld flanges produced by casting to both ends of the pipeline. This method involves the complicated production process of the flange itself. Since the flange and the pipe body are connected by welding, the corners of the welding edges are sharp, the stress is abnormally concentrated, and the service life of the product is short

Method used

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  • Forming technology for welding neck flange

Examples

Experimental program
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Effect test

Embodiment 1

[0011] Take a long straight steel pipe as the blank. The length of the steel pipe is 180cm, the diameter (diameter) is 40cm, and the material is 304 stainless steel. The steel pipe is directly extruded from both ends of the steel pipe on the cold forming machine to form flanging, and the flanging reaches the central axis of the steel pipe. The shortest radius is 22cm, and the longest radius is 24cm; heat-treat the billet, send the billet into the heat treatment furnace, keep it at 1050°C for 10-18min, leave the furnace and air-cool to room temperature, and machine the flanging to reach the target flange size. The corresponding radius of the flange is 20cm.

Embodiment 2

[0013] Take a long straight steel pipe as the blank. The length of the steel pipe is 160cm, the pipe diameter (diameter) is 50cm, and the material is 42CrMo alloy steel. The steel pipe is directly extruded from both ends of the steel pipe on the cold forming machine to form flanging, and the flanging reaches the center of the steel pipe. The shortest radius of the shaft is 24cm, and the longest radius is 25.8cm; carry out heat treatment on the billet, send the billet into the heat treatment furnace, and undergo normalizing and tempering treatment. 460-510°C, take out of the furnace and air cool to room temperature, machine the flanging to reach the target flange size, and the corresponding radius of the flange is 24cm.

[0014] Example 2

[0015] Take the long straight steel pipe as the blank, the length of the steel pipe is 200cm, the pipe diameter (diameter) is 50cm, and the material is No. 45 steel (carbon steel). The radius from the edge to the central axis of the steel p...

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Abstract

The invention relates to a forming technology for a welding neck flange. A long straight steel pipe is used as a blank. The length of the steel pipe is larger than the straight pipe length of a welding neck flange product, and the pipe diameter of the steel pipe is consistent with the straight pipe diameter of the welding neck flange product. The steel pipe is directly subjected to extrusion forming from the two ends of the steel pipe on a cold forming machine so that turned edges can be formed, and the dimensions of the turned edges are not smaller than the flange dimensions of the welding neck flange product. The blank is subjected to heat treatment, and the turned edges are machined after being cooled so that the need of target flange dimensions can be met. A flange body and the steel pipe part are of an integrated structure, the defect that the stress of the welding neck flange at the transition position of the flange and the straight pipe is excessively concentrated is avoided, and therefore the connection strength of the flange in engineering application is improved, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the technical field of steel pipe processing, and in particular relates to a forming process of a long-necked flange. Background technique [0002] Long-necked flanges are mainly used for continuous laying of large-diameter pipelines. The manufacturing of existing long-necked flanges is mainly to weld the flange flanges produced by casting to the two ends of the pipeline. This method involves the complicated production process of the flange itself. Since the flange and the pipe body are connected by welding, the corners of the welding edges are sharp, the stress is abnormally concentrated, and the service life of the product is short. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a long-necked flange forming process based on the above-mentioned prior art, which is directly integrally formed, the flange and the pipe are integrated, and there is no welding process, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 陈龙王建洪王万华任永建张敏军朱李凌吴天慧陈徐建李保兴
Owner 江阴市天柠管道有限公司
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