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Method for embowing pipe with small curvature radius

A small curvature, pipe technology, applied in the field of small curvature radius pipe bending in boilers, can solve the problems of pipe wall thickness deformation, failure to meet the requirements of the pipe ball test, etc., achieve less equipment investment, easy to implement bending method, The effect of simple bending method

Inactive Publication Date: 2006-12-13
SHANGHAI INDAL BOILER RES INST
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AI Technical Summary

Problems solved by technology

[0003] The present invention overcomes the defect that the existing small curvature radius pipe bending method seriously deforms the pipe wall thickness and fails to meet the requirements of the pipe through-ball test, and provides a new small curvature radius pipe bending method. The method adopts the two-process processing method of bending the large bending radius first and then bending the small curvature radius to realize the bending of the small curvature radius pipe. The bent pipe meets the requirements of the relevant technical standards. The bending method is simple and easy to implement. , less equipment investment, low cost

Method used

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  • Method for embowing pipe with small curvature radius
  • Method for embowing pipe with small curvature radius
  • Method for embowing pipe with small curvature radius

Examples

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Effect test

Embodiment 1

[0019] Example 1, for pipe diameter D=38×5.5, bending radius R=38, bending angle α=180°+2β=192°, pipe material ST35.8, 15CrMo, see Figure 5 .

[0020] The first processing steps are as follows:

[0021] 1) Heating the inside of the tube, the temperature is controlled at 800-850°C, and the heating length is the arc length of the tube; through heating, the extrusion force on the inner wall of the tube is reduced, and the stretching of the outer wall is also reduced.

[0022] 2) Apply a bending force to the inner wall and outer wall of the pipe on the pipe bender at the same time, so that the driving wheel and the driven wheel of the pipe bender rotate simultaneously, and the pipe is bent into a 180° U-shaped bend with R=1.5D;

[0023] 3) Reshape the bent pipe.

[0024] The ellipticity, thinning amount and flow cross section of the pipe meet the requirements of JB / T1611-93.

[0025] The second process heats the pipe after the first bend, and bends and corrects it on the hydra...

Embodiment 2

[0031] Embodiment 2, for pipe diameter D=45×5, bending radius R=45, bending angle α=180°+2β=192°, pipe material ST35.8, see Figure 5 .

[0032] The first processing procedure is the same as that of Embodiment 1, and the pipe is bent into a 180° U-shaped pipe with R=1.35D by using internal heating.

[0033] The second processing procedure is identical with embodiment 1.

[0034] After testing, the bent pipes made in the above-mentioned embodiment 1 and embodiment 2 all passed the requirements of ellipticity, thinning amount, flow cross section and ball passing test.

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Abstract

The invention relates to a bending method for boiler tubes with small curvature radius. The process for bending the boiler tubes with small curvature radius comprises two processing steps: the first is bending the tube; the second is heating the bent tube, and bending and correcting the tube by a hydraulic machine. The process is carried out conveniently with low cost.

Description

technical field [0001] The invention relates to a method for bending a pipe with a small curvature radius in a boiler. Background technique [0002] Key equipment in domestic waste furnaces, including evaporators, superheaters, and economizers, require a large number of small curvature radius tubes, such as tube bending radius R / tube diameter D≤1.4. According to the industrial boiler standard JB / T1611-93 5.2.1 through-ball acceptance standard, when R / D≤1.4, the data is indeterminate, indicating that when the pipe bending radius R≤1.4D, it belongs to the small radius of curvature, and it is very easy to manufacture in terms of technology. Difficult, so the tube bending radius R in the design of industrial boilers is greater than 1.4 tube diameters. In foreign countries, the bending method of pipes with small curvature radius is to pour yellow sand into the pipe and then bend it after heating. Because the wall thickness of the pipe is seriously deformed during bending, some o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D7/00
Inventor 张光达朱忠德
Owner SHANGHAI INDAL BOILER RES INST
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