CN1042673A - Large-diameter steel pipe pipe-end straightening method and device - Google Patents
Large-diameter steel pipe pipe-end straightening method and device Download PDFInfo
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- CN1042673A CN1042673A CN 88107835 CN88107835A CN1042673A CN 1042673 A CN1042673 A CN 1042673A CN 88107835 CN88107835 CN 88107835 CN 88107835 A CN88107835 A CN 88107835A CN 1042673 A CN1042673 A CN 1042673A
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- reducing
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Abstract
The present invention is a kind of large-diameter steel pipe pipe-end straightening method and device thereof, and the welded tube big at elasticity, that the mechanical strength fluctuation is big has proposed pipe end shrink mouth, the method for enlarging and usefulness and apparatus for correcting thereof.The result shows: correct pipe end with this method, can not only obtain accurately consistent caliber size and high pipe end out of roundness, also can utilize the buckling deformation of reducing operation rectification commissure wherein, enlarging, reducing available combination device, also can realize by special-purpose expansion, reducing device, little for elasticity, that the mechanical strength fluctuation is little seamless pipe and welded tube can be only with wherein the enlarging or the reducing of small deformation can be corrected pipe end.
Description
The present invention relates to a kind of large-diameter steel pipe pipe-end straightening method and employed device.
Pipe end out-of-roundness in the spiral welded pipe forming process and caliber Deviation Control are to need the problem of solution in the spiral welded pipe production badly always, the pipe end out-of-roundness franchise of American Petroleum Institute (API) (API) standard code is caliber ± 1%, for large-diameter pipe, this standard is loose excessively, spiral welded pipe as φ 529mm, pipe end out-of-roundness franchise is ± 5.29mm, such pipe is when the pipe end chamfered edge, the seamed edge at pipe end cross section major axis place is partly understood Lock-out, during pipe arrangement welding procedure in the open air, be difficult to two pipes welded together, promptly enable butt welding together, also can produce very big residual stress, thereby commissure mechanical strength and corrosion resistance are obviously descended, caused pipeline insecurity in use, thereby the pipe end rectification necessitates.
Abroad the method for correcting about pipe end generally all is confined to the out of roundness rectification of seamless pipe and vertical masonry joint pipe, about spiral welded pipe pipe total length expander antidote is only arranged, these methods all are difficult to solve spring-go and the caliber offset issue in the pipe end correcting process, the former elegant explicit law (JP5522462 of Pu, JP5858945, spring-go and caliber Deviation Control when US4262517) having solved the rectification of vertical masonry joint pipe well, but to the not clear material of intensity, need to increase that a cover tubing mechanical performance detects and expander after the Control System of Microcomputer of girth control, complicated operating process, rectification efficient is low, so do not apply.
The objective of the invention is to propose a kind of antidote and correcting device of new large-diameter steel pipe pipe end, utilize this method and apparatus, the true garden degree that can be used for the pipe end of various materials is corrected, and operating process is simple, correct back precision height, rectification efficient height is suitable for to be applied.
Detailed content of the present invention is as follows:
One, antidote:
Carry out the correction process of enlarging → reducing → enlarging for large-diameter steel pipe, or the correction process of employing reducing → enlarging → reducing, enlarging amount and degree of choke should be suitable, be generally the 1-5% of caliber, wherein reducing operation can adopt multiple roll outward turning reducing or carry out axial reducing with taper that has vertical wall section or circular arc die.The enlarging operation then can be undertaken by following manner:
(1) expands in the rigidity piecemeal mould
(2) multiple roll inward turning
(3) expand in the elastomer
(4) blast or electro-magnetic forming
Enlarging, reducing all can improve the pipe end out of roundness, the result that two kinds of operations are corrected pipe end makes the pipe end out of roundness reach very high level, also because reducing can the butt welded seam buckling deformation have correcting, pipe end caliber size after the reducing is accurately consistent, thereby forms the comprehensive correction method of a kind of pipe end out of roundness, pipe end caliber deviation, the buckling deformation of welded tube weld seam.
Two, apparatus for correcting
Expansion, reducing operation can be passed through composite set (the i.e. combination of the Several Methods of expansion, reducing, Fig. 1 is an example wherein) or special-purpose expansion, reducing device realization, the clamping of steel pipe, location and feed arrangement can adopt hydraulic pressure, electric or mechanical system realization in the device., tubing mechanical performance inconsistency big for elasticity is big, the pipe end of welded pipe end weld metal zone buckling deformation big (as the T/S-52K pipe) is corrected the clustered operation that then need adopt enlarging, reducing, and little for general elasticity, the mechanical performance inconsistency of tubing is little, the weld metal zone warpage is little (as A
3Pipe, SM41B pipe) pipe end is corrected, and only enlarging or the reducing operation with this device can reach higher rectification effect.In addition, this device also can carry out the enlarging and the reducing processing of large deformation to pipe end.
Apparatus for correcting involved in the present invention is made up of various piece shown in Figure 1, comprising: contract, flaring die 2, and rigidity piecemeal mould 6, pull bar 7, assembly 8, elastomer 9, cover cylinder 10, fixed oil cylinder 11, pull bar 12, crossbeam 13, fixedly support 14, contract, flaring die plate washer 15.The flaring die 2 that wherein contracts is formed by three sections, and first section is vertical wall section 3, length l
Be 100-150mm, internal diameter is (1.02～1.10) D
0, (D
0Pipe end nominal outside diameter for the API prescribed by standard), second section is tapering part 4, its semi-cone angle φ=5 °～15 °, and the 3rd section is vertical wall section 5, length l
2Be 40-150mm, diameter is D
+ 1.0 0+0.5The core tube section axial length of assembly 8 (the core tube part corresponding with 2 second sections vertical wall sections 5 of reducing die and tapering part 4) is vertical wall section 5 and tapering part 4 axial length sums, the choosing of core tube part (assembly 8) outside dimension D following (core tube external diameter comprises that elastomeric gauge, elastomer wall thickness are generally 5-20mm)
D＝D
0-2t
Wherein t is a thickness of pipe wall
That pipe end is taken place when the large deformation reducing is circumferential when rugosity if the gap of core tube and final reducing pipe end internal diameter reaches, then consider on the core tube, to add one deck elastomer (adopting shear strength polyurethane preferably), make that the external diameter of core tube is just in time consistent with pipe end internal diameter after the final reducing, i.e. D=D
0-2t like this, can avoid the nip phenomenon of pipe end reinforcement of weld between reducing die 2 and core tube, circumferentially rugosity generation of pipe end in the time of can avoiding reducing again.
The axial restraint of reducing die 2 is by the garden disc portion of assembly 8 and garden, equipment end dish 15(band muscle) realize, concentrfated load (axial force that produces owing to the rubbing action between tube wall and the reducing die wall when pipe end 1 withdraws from reducing die 2) for fear of band muscle garden dish 15 and reducing die 2 contact positions acts on the distortion that causes concentrfated load place, therefore in design, adopted reinforcing plate structure (radial symmetric layout) slowing down the distortion of locating in the load body, thereby played better fixation reducing die 2.
Core tube (assembly 8) end has radial groove, when enlarging rigidity piecemeal mould 6 can be under pull bar 7 ramp effect radially inwardly or outwards motion, anti-circumferential rugosity measure when the core tube also can be used as the targeting part of pull bar 7 and reducing.
The axial necking force effect of pull bar 12 when bearing reducing, also can be used as the axially directed of the crossbeam 13 that links to each other with reducing die 2, when reducing, the pipe end center overlaps naturally with the center of reducing die 2.Adopt the segmentation connecting structures at middle corresponding position (not drawing among the figure) pull bar 12 of pull bar 12 and pipe, can carry out the dismounting combination according to pipe range.
Fig. 1 is the schematic diagram of one of this method, the general process of its dog is: pipe end 1 enters first section vertical wall section 3 of reducing die 2, pull bar 7 is done the time spent left, 6 pairs of pipe ends of rigidity piecemeal mould 1 carry out enlarging, pull bar 7 and cover cylinder 10 move to right, pipe end 1 enters the tapering part 4 and the vertical wall section 5 of reducing die 2 thereupon, when reducing die 2 withdraws from pipe end 1, promptly finishes rectification.
This method and equipment can be to the weld seam peach shape mouths of spiral welded pipe " carry out the part and correct.Spiral welded pipe is when three bending moulding, straight flange might appear at commissure, welding back thermal deformation and spring-go result make the weld seam partial zones buckling deformation (promptly so-called " peach shape mouth " phenomenon) (shown in Fig. 2 a) occur, axially during reducing, at first be that the weld seam ribs contacts with die wall, thereby make weld seam radially move inward (Fig. 2 b), pipe end withdraws from after the reducing die, " peach shape mouth " has an outside rebound amount, final result makes weld seam partial zones come by rectification (Fig. 2 c), and its correcting principle is equivalent to member bending and corrects.
, mechanical performance big with this method rectification elasticity fluctuates big, during the big tubing of weld seam buckling deformation, regardless of the pipe end reset condition, all can obtain very satisfied effect after the rectification, and little for general spring-go, the mechanical performance fluctuation is little, and enlarging or reducing that the little pipe of weld seam buckling deformation only need carry out the small deformation amount just can obtain rectification effect preferably, this method is for any tubing, and the pipe end of cast (seamless pipe, vertical masonry joint pipe, spiral welded pipe rectangular tube) is corrected all and is suitable for arbitrarily.
For different calibers, thereby can carry out the corresponding size that reducing die and core tube are adjusted in local dismounting combination to the correction section of this device, when pipe range 1 changes, the correcting device respective distance at pipe two ends is also wanted respective change, in the device as Fig. 1, can regulate the pull bar 12 of segmentation connection and realize, in sum, this method is that the very big pipe end out of roundness of a kind of versatility is corrected, caliber is controlled and the weld seam method for straightening warp.
Fig. 1 is the schematic diagram of apparatus of the present invention, wherein
The 1-pipe end; The 2-reducing die; (the first section vertical wall section of reducing die 2 of position during the enlarging of 3-pipe end; Tapering part in the 4-reducing die 2; Second section vertical wall section in the 5-reducing die 2; 6-rigidity piecemeal mould; The 7-pull bar; 8-assembly (comprise that core tube, reducing die tighten up, guiding holds out against part during enlarging); The 9-elastomer; 10-overlaps cylinder; 11-is support fixedly; The 15-reducing die 2 fixing baffle plates of using; The 16-pull bar tightens up uses nut; The semicircle fixed cover of 17-; The 18-sliding sleeve; 19-oil cylinder hold-down nut.
The correcting process of weld metal zone buckling deformation before and after Fig. 2-pipe end shrink mouth;
The warpage pattern of weld seam partial zones before the a-reducing;
The pattern of weld seam partial zones during the b-reducing;
The pattern of weld metal zone when the c-pipe end withdraws from reducing die.
The stress-strain diagram of Fig. 3-T/S-52K hot rolled strip (curve A) and 16Mn cold-rolled strip (curve B);
During the whole garden of Fig. 4-rigidity piecemeal mould expander, pipe end out-of-roundness Δ D(curve A) the girth increment Δ l(curve B) curve that changes with expander pressure;
Fig. 5-pipe end outside adds annular metal restriction cover, in the pipe with the pipe end out-of-roundness Δ D(curve A of the pipe-end straightening method correspondence of rigidity piecemeal mould account (seeing patent JP5825822)), girth increment Δ l(curve B) with the curve of expander pressure variation;
Fig. 6-pipe end outside adds annular metal restriction cover, pipe end out-of-roundness Δ D(curve A when expanding (seeing patent JP55117530) with polyurethane in the pipe), girth increment Δ l(curve B) curve that changes with on-load pressure;
The former elegant explicit law of Fig. 7-Pu (see patent JP5522462, JP5858945, when US4262517) pipe end is corrected, pipe end out-of-roundness Δ D(curve A), girth increment Δ l(curve B) and pressure-dependent curve;
When carrying out reducing (taper matrix that has vertical wall section) after Fig. 8-pipe end enlarging again (one of this patent scheme), the curve that pipe end out-of-roundness Δ D changes with the reducing rate.(A is rugosity point when being reducing)
Embodiment:
For the pipe end of simulating actual large-diameter steel pipe is corrected, adopted spring-go and intensity to be equivalent to the 16Mn hot rolled strip than the T/S-52K(performance) also want big 16Mn cold-rolled strip (performance is relatively seen Fig. 3), roll the test spiral welded pipe, caliber is φ 60mm, wall thickness t=1.23mm, also compared no reinforcement of weld (sanding of flat) in the test and the pipe end correction result of reinforcement of weld is arranged, found, the buckling deformation effect of no reinforcement of weld (polishing seam) is not if any the pipe of reinforcement of weld.
At controlling pipe end out of roundness and this requirement of caliber deviation simultaneously, with this patent scheme experimental result be considered to several preferably pipe end correction solution experimental results abroad and done comparative analysis.The result shows that this patent scheme is more effective scheme.Fig. 4～8 are experimental result.
Claims (3)
1, a kind of method that is used for the rectification of large-diameter steel pipe pipe end, it is characterized in that adopting the correction process of reducing → enlarging → reducing, the enlarging amount should be suitable with degree of choke, 1-5% for caliber, reducing is adopted the multiple roll outward turning to contract or is carried out axial reducing with taper that has vertical wall section or circular arc die, and any one of following manner kind adopted in enlarging:
A, rigidity are divided in the fast mould bloated
B, multiple roll inward turning
Expand in c, the elastomer
D, blast or electro-magnetic forming
2, a kind of apparatus for correcting that is used for the described method of claim 1 comprises the flaring die 2 that contracts, and rigidity is divided fast mould 6, pull bar 7, assembly 8, cover cylinder 10, fixed oil cylinder 11, pull bar 12, crossbeam 13, fixedly support 14, the flaring die 2 that it is characterized in that contracting is formed by three sections, first section is vertical wall section 3, and length is the 100-150 millimeter, and internal diameter is 1.02～1.10D
0(D
0Pipe end nominal outside diameter for the API standard code), second section is tapering part 4, and semi-cone angle is 5 °-15 °, and the 3rd section is vertical wall section 5, and length is the 40-150 millimeter, and internal diameter is D
+ 1.0 0+0.5, the core tube section axial length of assembly 8 is 5 and 4 axial length sum, core tube part outside dimension D chooses D=D by following formula
0-2t(mm) wherein t is a thickness of pipe wall, the core tube part left end of assembly 8 flange section and the end connection that overlaps cylinder 10, adopt gusset to strengthen between its garden disc portion and the left end flange section, core tube end has radial groove, pull bar 12 adopts and divides section connection structure, and band muscle garden dish 15 adopts reinforcing plate structure with reducing die 2 contact positions.
3, the described apparatus for correcting of claim 2 is characterized in that adding one deck elastomer 9 on the core tube, elastomer adopts shear strength polyurethane manufacturing preferably.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88107835 CN1042673A (en) | 1988-11-12 | 1988-11-12 | Large-diameter steel pipe pipe-end straightening method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88107835 CN1042673A (en) | 1988-11-12 | 1988-11-12 | Large-diameter steel pipe pipe-end straightening method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1042673A true CN1042673A (en) | 1990-06-06 |
Family
ID=4834803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88107835 Pending CN1042673A (en) | 1988-11-12 | 1988-11-12 | Large-diameter steel pipe pipe-end straightening method and device |
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| Country | Link |
|---|---|
| CN (1) | CN1042673A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1093444C (en) * | 1999-07-23 | 2002-10-30 | 广州南方管道有限公司 | Process for expanding end of large diameter thick wall steel pipe |
| CN101653803B (en) * | 2008-08-22 | 2011-03-02 | 首都航天机械公司 | Corrugated tube port magnetic-pulse precision corrector |
| CN102223961A (en) * | 2008-11-25 | 2011-10-19 | 住友金属工业株式会社 | Device for correcting pipe-end shape of uoe metallic pipe |
| CN102641917A (en) * | 2012-04-12 | 2012-08-22 | 燕山大学 | Round setting technique for pipe end of large-size pipe fitting |
| CN102927431A (en) * | 2012-10-26 | 2013-02-13 | 江苏承中和高精度钢管制造有限公司 | Oil cylinder pipe |
| CN105268780A (en) * | 2014-07-17 | 2016-01-27 | Sms米尔股份有限公司 | Method and apparatus for correcting end of metal tube |
| CN106180280A (en) * | 2016-08-31 | 2016-12-07 | 中国重型机械研究院股份公司 | A kind of for heavy caliber seamless steel pipe end diameter-setting equipment and method |
| CN113090611A (en) * | 2021-04-15 | 2021-07-09 | 宁波市江北宏菱新兴绝缘材料有限公司 | Hydraulic oil cylinder shell correction device and process |
-
1988
- 1988-11-12 CN CN 88107835 patent/CN1042673A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1093444C (en) * | 1999-07-23 | 2002-10-30 | 广州南方管道有限公司 | Process for expanding end of large diameter thick wall steel pipe |
| CN101653803B (en) * | 2008-08-22 | 2011-03-02 | 首都航天机械公司 | Corrugated tube port magnetic-pulse precision corrector |
| CN102223961A (en) * | 2008-11-25 | 2011-10-19 | 住友金属工业株式会社 | Device for correcting pipe-end shape of uoe metallic pipe |
| CN102223961B (en) * | 2008-11-25 | 2014-06-11 | 新日铁住金株式会社 | Device for correcting pipe-end shape of uoe metallic pipe |
| CN102641917A (en) * | 2012-04-12 | 2012-08-22 | 燕山大学 | Round setting technique for pipe end of large-size pipe fitting |
| CN102927431A (en) * | 2012-10-26 | 2013-02-13 | 江苏承中和高精度钢管制造有限公司 | Oil cylinder pipe |
| CN105268780A (en) * | 2014-07-17 | 2016-01-27 | Sms米尔股份有限公司 | Method and apparatus for correcting end of metal tube |
| CN106180280A (en) * | 2016-08-31 | 2016-12-07 | 中国重型机械研究院股份公司 | A kind of for heavy caliber seamless steel pipe end diameter-setting equipment and method |
| CN106180280B (en) * | 2016-08-31 | 2018-03-13 | 中国重型机械研究院股份公司 | One kind is used for heavy caliber seamless steel pipe end sizing method |
| CN113090611A (en) * | 2021-04-15 | 2021-07-09 | 宁波市江北宏菱新兴绝缘材料有限公司 | Hydraulic oil cylinder shell correction device and process |
| CN113090611B (en) * | 2021-04-15 | 2023-06-20 | 宁波市江北宏菱新兴绝缘材料有限公司 | Hydraulic cylinder shell correcting device and process |
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| WD01 | Invention patent application deemed withdrawn after publication |