Inner press roller roll type outline matching screw tube blank

A technology of inner pressure roller and contour line, applied in the field of inner pressure roller, can solve the problems of lack of wave bending indentation of tube blank, unreasonable inner pressure roller roll shape, unreasonable roll shape design, etc., to achieve uniform deformation and improve internal pressure. quality, the effect of improving quality

Inactive Publication Date: 2007-04-11
白忠泉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the spiral welded pipe products, it is often seen that there are wavy indentations on the pipe body of some pipes. This wavy indentation is a manufacturing defect. The roll shape of the pressure roll is unreasonable. In the prior art, the roll shape of the inner pressure roll can only be determined by the comparison method. Such a result is often far from the ideal roll shape. After entering the forming device, the roller group with the greatest force in the forming device is the inner pressure roller. Due to the unreasonable design of the roller shape of the inner pressure roller, the point contact between the inner pressure roller and the spiral tube billet will cause stress concentration on the strip steel, resulting in The tube blank produces wavy bending and indentation defects

Method used

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  • Inner press roller roll type outline matching screw tube blank
  • Inner press roller roll type outline matching screw tube blank
  • Inner press roller roll type outline matching screw tube blank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The roll shape curve of the inner pressure roller 1 can be determined by the radius of the roll shape curve of the inner pressure roller, that is:

[0021] R 母 =(R 投 -R 半 ×Sin 2 alpha 内 ) / cos 2 alpha 内 , according to the process parameters of spiral welded pipe products, as the known conditions of this embodiment.

[0022] The inner radius R of the spiral tube blank 2 is known 内 =400mm, inner forming angle α 内 = 60 degrees, the radius R of the inner pressure roller 1 半 =75mm, since the manufactured internal pressure roller 1 is in line contact with the spiral tube blank 2, then R 投 =R 内 =400mm, according to this we can know:

[0023] R 母 =(400-75×Sin 2 60) / cos 2 60=1375(mm)

Embodiment 2

[0025] The second embodiment is to verify the applicability of the known roll shape when the roll shape curve of the internal pressure roll 1 is determined.

[0026] The radius R of the roll shape curve of the inner pressure roll is known 母 is 200mm, the installation angle is 40 degrees, and the diameter is 150mm. Order R 内 =R 投 achieve line contact, the R 内 can be obtained by the equation R 内 =R 半 ×Sin 2 alpha 内 +R 母 ×cos 2 alpha 内 ,inferred:

[0027] R 内 =75×Sin 2 40+200×cos 2 40 = 148 (mm).

[0028] It can be seen that, when the radius of the roll curve of the inner pressure roller is 200 mm, the radius of the spiral tube blank 2 determined by the line contact is 148 mm.

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Abstract

The inner press roller with rolling outline matching screw pipe blank features its rolling curve equation. Owing to the linear contact, the present invention can avoid wavy rolling impression and raise the rolling quality. The decrease of wavy rolling impressing is favorable to the anticorrosion treatment of the pipe, low conveying resistance, homogeneous deformation of the pipe and inherent quality of pipe.

Description

(1) Technical field [0001] The invention relates to an inner pressure roller in a spiral welded steel pipe forming device. (2) Technical background [0002] In the spiral welded pipe products, it is often seen that there are wavy indentations on the pipe body of some pipes. This wavy indentation is a manufacturing defect. The roll shape of the pressure roll is unreasonable. In the prior art, the roll shape of the inner pressure roll can only be determined by the comparison method. Such a result is often far from the ideal roll shape. After entering the forming device, the roller group with the greatest force in the forming device is the inner pressure roller. Due to the unreasonable design of the roller shape of the inner pressure roller, the point contact between the inner pressure roller and the spiral tube billet will cause stress concentration on the strip steel, resulting in The tube blank has wavy bending and indentation defects. (3) Contents of the invention [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/12
Inventor 白忠泉
Owner 白忠泉
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