CN101927281B - Method for manufacturing step-variable cold bending pipe - Google Patents
Method for manufacturing step-variable cold bending pipe Download PDFInfo
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- CN101927281B CN101927281B CN2009100867330A CN200910086733A CN101927281B CN 101927281 B CN101927281 B CN 101927281B CN 2009100867330 A CN2009100867330 A CN 2009100867330A CN 200910086733 A CN200910086733 A CN 200910086733A CN 101927281 B CN101927281 B CN 101927281B
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Abstract
The invention relates to a method for manufacturing a step-variable cold bending pipe, comprising the following steps: (1) adopting a vertical hydraulic pressure cold bending machine to determine a bending angle in a unit step which can not cause overproof steel pipe deformation via a simulation test specific to the steel pipe used in a project, and defining the angle as a; (2) determining the bending angel b required to be realized by the cold bending pipe according to the line pipe design requirement, thus obtaining the required bending times which can be calculated as the formula: n=b/a; (3) measuring the length of the steel pipe to be bended, and determining the effective steel pipe length L1 in bending processing, thus calculating the selectable step L=L1/n for bending the steel pipe; and (4) bending based on that the step is L and the bending angle in the unit step is a, thus realizing manufacturing of the cold bending pipe. The method in the invention can manufacture cold bending pipes in different angles by bending without changing the deformation, has accurate bending and even deformation, is simple and can avoid significant changes in material properties due to oversize local deformation of the pipe.
Description
Technical field
The invention belongs to engineering goods and make the field, relate to a kind of manufacture method that can be applicable to Oil and Natural Gas Transportation Pipeline with the clod wash pipe.
Background technology
The clod wash pipe be with steel pipe according to certain radius of curvature, directly carry out physical bend, obtain satisfactory angle of bend, thereby adapt to the change of line alignment in the pipeline construction, this is used widely in the petroleum gas long distance pipeline.
The transportation pipe line normally adopts heavy caliber, thick walled steel tube with the clod wash pipe, utilizes the cold bending machine of vertical hydraulic to carry out the scene and bends.It is the process of an angle of bend superposition that oil gas is carried the clod wash process with large diameter steel pipe, as shown in Figure 1, in effective bending section " BG " of steel pipe AH, at first that " AB " section is fixing, apply lifting power P in " CH " section it is lifted, make steel pipe " BC " section produce a certain amount of flexural deformation; Second step, will " AC " section fixing, apply lifting power P in " DH " section and will rise and lift, make a certain amount of flexural deformation of " CD " section generation; The rest may be inferred, all effective bending length of steel pipe can be carried out bending machining, and tube bending is to design angle the most at last.Each flexural deformation section as " BC ", " CD " etc., may be defined as and bends " step-length ".At present, in the manufacture process of clod wash pipe, adopting usually fixing " step-length ", generally is the unit step-length with 300mm in the site operation, and the deflection (angle of bend) in the unit step-length changes with the variation of the tube bending angle of design.
Bent the process characteristics and limit, the distortion in bend pipe unit's step-length (as " BC ", " CD " section) is also inhomogeneous, mainly concentrates in the littler segment length, just the position that exists distortion to concentrate in the unit step-length.In the unit step-length angle of bend bigger in, will cause that the local deformation amount is excessive, and cause material property that bigger variation takes place by deformation.In addition, for high tensile steel tube, the deflection that single bends can not unconfined increase, thereby if bend the clod wash pipe of wide-angle, only is difficult to realize by the angle of bend that changes in the unit step-length.
By the construction of existing elbow pipe processing technology, great bend pipe angle no matter all adopts the step-length of fixing 300mm.When the clod wash tube angulation of designing requirement was big, the deflection in the clod wash canal curvature section unit step-length increased.Existing construction technology and the process of bending have determined that the distortion of steel pipe in the unit step-length is inhomogeneous, and it is bigger that the position that distortion is concentrated must appearance change occur, and can cause material property that bigger variation takes place because of deformation is excessive.
Summary of the invention
The object of the invention is to carry a kind of altogether step-variable cold bending pipe fabrication technique, adopt relatively-stationary less deflection (unit step-length internal strain angle), satisfy wide-angle clod wash pipe, make the body deflection comparatively even, improve bend pipe body physical dimension, avoid the local performance of body that bigger variation takes place.
The present invention designs a kind of step-variable cold bending pipe fabrication technique, is used for the manufacturing of oil gas conveying with the clod wash pipe.
Characteristics of the present invention are, in oil gas is carried manufacture process with the clod wash pipe, adopt clod wash deflection in the relatively-stationary unit step-length, realize the angle of bend that designs by changing step-length.
This cold bending pipe fabrication technique process is:
(1) at steel pipe used in the engineering, adopt vertical hydraulic formula bending machine, determine that by simulated test one unlikelyly causes angle of bend in the unit step-length that pipe deformation exceeds standard, this viewpoint definition is a;
(2) according to the pipeline designs requirement, determine the angle of bend b that the clod wash pipe will be realized, can draw the frequency n=b/a that need bend thus;
(3) measure the length of steel pipe to be bending, reserve the straight length of certain-length according to the needs of bending machine, remainder is defined as carrying out effective steel pipe length L 1 of bending process, bends the available step-length L=L1/n of this steel pipe thereby calculate;
(4) be L by step-length, angle of bend a carries out bending process in the unit step-length, realizes the manufacturing of clod wash pipe.
The effect of invention
The present invention is a kind of step-variable cold bending pipe fabrication technique, and its characteristics realize the angle of bend that designs for adopting the interior clod wash deflection of relatively-stationary unit step-length by the change step-length.
Compared with prior art, the present invention adopts the fixed deformation amount all the time, and the clod wash pipe that bends different angles need not to change deflection, and this just makes that the process that bends is more accurate, also simple relatively.And less deflection can make that the deformation ratio of bend pipe body is more even in the unit step-length, the excessive situation of deflection can not occur, and this just more can guarantee the physical dimension of bend pipe, has also avoided the bigger variation of the excessive material property that causes of body local deformation.
Description of drawings
Fig. 1 oil gas is carried and is bent the process schematic diagram with the clod wash pipe.
The specific embodiment
Embodiment 1-3
For the higher natural-gas transfer pipeline of intensity rank X80 steel pipe, its intensity is higher, and elastic range is bigger, and bending than difficult of aximal deformation value realizes, and make steel tube performance produce big variation easily.Adopt the designed variable step bend pipe manufacturing process of this patent, optional phasing bends the deflection of 0.2 ° less/step-length.
When needs when to bend angle of bend be 4 ° bend pipe, the effective bending length≤7m of steel pipe can select the step-length of 300mm, promptly adopts the technology of 0.2 °/300mm to bend, and bends 20 step-lengths (being 6m) altogether and can obtain 4 ° bend pipe.
When needs when to bend angle of bend be 7 ° bend pipe, can select the step-length of 200mm, promptly adopt the technology of 0.2 °/200mm to bend, bend 35 step-lengths (being 7m) altogether and can obtain 7 ° bend pipe.
When needs when to bend angle of bend be 8 ° bend pipe, can select the step-length of 170mm, promptly adopt the technology of 0.2 °/170mm to bend, bend 40 step-lengths (being 6.8m) altogether and can obtain 8 ° bend pipe.
Claims (1)
1. step-variable cold bending pipe fabrication technique is characterized in that:
This cold bending pipe fabrication technique process is:
(1) to natural-gas transfer pipeline X80 steel pipe, adopt vertical hydraulic formula bending machine, determine to adopt the deflection of 0.2 °/step-length to bend by simulated test, this viewpoint definition is a;
(2) according to the pipeline designs requirement, determine the angle of bend b that the clod wash pipe will be realized, can draw the frequency n=b/a that need bend thus;
(3) measure the length of steel pipe to be bending, and determine to carry out effective steel pipe length L 1 of bending process, bend the available step-length L=L1/n of this steel pipe thereby calculate;
(4) be L by step-length, angle of bend a carries out bending process in the unit step-length, realizes the manufacturing of clod wash pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100867330A CN101927281B (en) | 2009-06-26 | 2009-06-26 | Method for manufacturing step-variable cold bending pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100867330A CN101927281B (en) | 2009-06-26 | 2009-06-26 | Method for manufacturing step-variable cold bending pipe |
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| Publication Number | Publication Date |
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| CN101927281A CN101927281A (en) | 2010-12-29 |
| CN101927281B true CN101927281B (en) | 2011-12-07 |
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| CN2009100867330A Active CN101927281B (en) | 2009-06-26 | 2009-06-26 | Method for manufacturing step-variable cold bending pipe |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102191815B (en) * | 2011-05-11 | 2012-10-10 | 江苏沪宁钢机股份有限公司 | Making method of multi-curvature radius twisted steel pipe |
| CN112178298B (en) * | 2019-09-10 | 2022-06-17 | 蓝箭航天空间科技股份有限公司 | Preparation method of rocket engine pipeline, rocket engine pipeline and engine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2762912Y (en) * | 2004-12-31 | 2006-03-08 | 广东工业大学 | Die sued for bending thin-wall tube variable curvature |
| KR100818840B1 (en) * | 2000-12-25 | 2008-04-01 | 니혼 하츠쵸 가부시키가이샤 | Apparatus for bending and working long materials |
| CN101380652A (en) * | 2008-10-14 | 2009-03-11 | 浙江东南网架股份有限公司 | Cold roll forming technique of large-sized curve type steel tube |
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2009
- 2009-06-26 CN CN2009100867330A patent/CN101927281B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100818840B1 (en) * | 2000-12-25 | 2008-04-01 | 니혼 하츠쵸 가부시키가이샤 | Apparatus for bending and working long materials |
| CN2762912Y (en) * | 2004-12-31 | 2006-03-08 | 广东工业大学 | Die sued for bending thin-wall tube variable curvature |
| CN101380652A (en) * | 2008-10-14 | 2009-03-11 | 浙江东南网架股份有限公司 | Cold roll forming technique of large-sized curve type steel tube |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2008-302380A 2008.12.18 |
| JP特开平8-252635A 1996.10.01 |
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