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Variable Radius Bending Method for Longitudinal Welded Pipe Roll Forming

A technology of straight seam welded pipe and roll forming, which is applied in the field of roll forming and variable radius bending of straight seam welded pipe based on deformation blind area, which can solve the problems of strip deformation blind area and incomplete contact.

Inactive Publication Date: 2011-12-07
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the above-mentioned deficiencies existing in the prior art, and provides a bending method of variable radius bending of straight seam welded pipes by roll forming, which solves the problem of the roll forming process of straight seam welded pipes in the prior art, which is mainly based on empty bending. The outer forming rolls are in a state of incomplete contact, resulting in a certain area on the strip that cannot directly contact the forming rolls to form a deformation blind area, such as image 3 shown

Method used

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  • Variable Radius Bending Method for Longitudinal Welded Pipe Roll Forming
  • Variable Radius Bending Method for Longitudinal Welded Pipe Roll Forming
  • Variable Radius Bending Method for Longitudinal Welded Pipe Roll Forming

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Embodiment 1

[0044] 1. Adopt the variable radius bending method of straight seam welded pipe roll forming of the present invention, carry out the forming of strip steel for the φ325mm welded pipe roll forming process under four kinds of different downhill amounts (0.1D, 0.4D, 0.7D, 1.0D) respectively volume design. The other initial input parameters for forming volume design are:

[0045] The final formed tube radius R=325 / 2mm;

[0046] The starting point of deformation blind zone a=0.5;

[0047] The end point of the deformation dead zone b=0.72;

[0048] Edge bending angle θ 3 = 38;

[0049] The radius of curvature R of the deformation dead zone 2 =R / 0.1=1625mm;

[0050] Fine forming first pass F p1 The vertical position coordinate value of Z fp1 =16100mm;

[0051] Fine forming first pass F p1 The width of the guide ring W f1 =64.38mm.

[0052] like Figure 5-Figure 7 As shown, this embodiment includes the following steps:

[0053] The first step is the longitudinal deformat...

Embodiment 2

[0079] Adopt the variable-radius bending method of roll forming of straight seam welded pipe of the present invention, carry out the forming amount design of strip steel for four kinds of different descending amounts (0.1D, 0.4D, 0.7D, 1.0D) under the roll forming process of φ406mm welded pipe . The other initial input parameters for forming volume design are:

[0080] The final formed tube radius R=406 / 2mm;

[0081] The starting point of deformation blind zone a=0.53;

[0082] The end point of the deformation dead zone b=0.75;

[0083] Edge bending angle θ 3 = 38;

[0084] The radius of curvature R of the deformation dead zone 2 =R / 0.1=2030mm;

[0085] Fine forming first pass F p1 The vertical position coordinate value of Z fp1 =16100mm.

[0086] According to the above-mentioned variable radius bending method, the parameters of the forming quantity with a descending amount of 0.7D are finally obtained as listed in Table 2, and the designed forming shape bitmaps under...

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Abstract

A straight seam welded pipe roll forming variable radius bending method in the field of straight seam welded pipe manufacturing technology, adopting the longitudinal deformation form and strip transverse bending mode in the strip steel forming formed by the downhill method, and according to the strip steel space shape in the forming process The three transverse bending sections of the strip and the transverse and longitudinal positions of the edge of the strip are obtained from the position, and finally the welded pipe is manufactured. The invention solves the problem of the roll forming process of the straight seam welded pipe in the prior art, which is mainly based on empty bending, and the profile of the formed section of the strip calculated by the variable radius bending method is in good agreement with the result measured after production by the method .

Description

technical field [0001] The invention relates to a method in the technical field of straight seam welded pipe manufacturing, in particular to a deformation radius bending method for straight seam welded pipe roll forming based on a deformation blind zone. Background technique [0002] Longitudinal welded pipe production generally adopts roll forming process. The roll forming process is a plastic processing technology that gradually bends the metal strip from a straight state to a specific cross-section through sequentially configured multi-pass forming rolls. The structure of the early traditional roll forming unit is a cross arrangement of flat rolls and vertical rolls, which is mainly used to produce small-diameter welded pipes. Later, after continuous improvement, the early forming units gradually evolved into the form of flat and vertical rolls plus vertical rolls, which can produce The pipe diameter also developed from a small diameter to a medium diameter. Later, in or...

Claims

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Application Information

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IPC IPC(8): B21D5/12
Inventor 李大永蒋劲茂任强唐鼎
Owner SHANGHAI JIAO TONG UNIV
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