CN104226833A - On-line rounding method used during overall-length expanding of steel tube and expanding die - Google Patents
On-line rounding method used during overall-length expanding of steel tube and expanding die Download PDFInfo
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Abstract
The invention discloses an on-line rounding method used during overall-length expanding of a steel tube. The size of an expanding die is determined according to the steel grade of the supplied steel tube, the target inner radius of the supplied steel tube, the wall thickness of the supplied steel tube and the like, the control parameters of an on-line steel tube expanding device are determined according to the supplied steel tube, and then rounding is achieved while on-line expanding is conducted on the steel tube. Correspondingly, the invention discloses an expanding die adopted in the on-line rounding method used during overall-length expanding of the steel tube.
Description
Technical field
The present invention relates to a kind of pipe expanding full circle method, particularly relate to a kind of online expanding full circle method of ERW.
Background technology
Along with in world wide to constantly universal and the in-depth of oil, the construction of natural gas fields and utilization, petroleum resources exploitation progressively turns to remote continental and the area, ocean of bad environments.Thus carry the service condition of oil gas steel pipe used also more and more severe, pipeline engineering is also more and more higher to technical requirements such as the mechanical performance of straight-line joint submerged arc welding tube, chemical property and geometry quality.In the standard of American Petroleum Institute API standard, company of Statoil DNV, Canadian CSA and all kinds of oceans pipe, the circularity quality requirement of Welded Pipe is more and more stricter.Therefore, the circularity precision index of expanding rear steel pipe is had higher requirement to expanding operation.
Due to the inherent characteristic of straight-line joint submerged arc welding tube forming method, steel plate is pressed into opening pipe, then through welded stress distortion, according to the difference of specification and grade of steel, can be rendered as irregular ellipticity along cross-wise direction, its reason mainly contains following several respects:
1. steel plate rolling technique characteristic makes steel plate intensity distribution along the circumferential direction present regional non-uniform phenomenon, makes the deflection of circumferencial direction also different;
2. steel plate is pressed into the opening pipe stage, due to reasons such as mould, equipment precision, process matchings, along the circumferential direction there is not toroidal, sometimes also presents obvious asymmetry;
3. opening pipe is after butt welding, and welding point and heat affected area deform, and cooled residual stress distribution is uneven, cannot not cause roundly phenomenon;
4. when adopting universal expander die, only adopt a kind of expander die of curvature for the pipe in certain wall thickness range, cause welded tube circumferencial direction to be out of shape and uneven, unloading spring-back amount is also uneven, causes producing round phenomenon.
Existing straight-line joint submerged arc welding tube production line, be all mainly rely on expanding operation (enlarging rate of 0.5 ~ 1.5%) to carry out stretch bending distortion, its essence is pipe circumferencial direction step-by-step movement cool sizing while, improves circularity precision as much as possible.This method not only inefficiency, after full circle, the out-of-roundness value of pipe is also is mostly that is the out-of-roundness index of steel pipe is poor near the indication range value upper limit.Therefore, the expanding stretch bending of existing this simple dependence and employing universal mold carry out the quality requirement that expanding method can not meet the straight-line joint submerged arc welding tube out-of-roundness day by day improved.
Summary of the invention
An object of the present invention be to provide a kind of steel pipe total length expanding time online full circle method, it is by improving existing expander die, and control the parameters such as correct roller position, expanding deformation effect district, realize the total length expanding and full circle online to dissimilar supplied materials welded tube.
According to foregoing invention object, the technical program provide a kind of steel pipe total length expanding time online full circle method, it comprises:
(1) some arc blocks are set in steel pipe, each arc block is close to steel pipe inside radius ground and is arranged in a circumferential direction to form a cylindrical tube (i.e. expander die), be provided with expanding cone in described cylindrical tube, the arc block that steel pipe seam is corresponding be provided with the groove of accommodating weld seam, wherein:
The axial length L of arc block meets:
in formula, k is empirical coefficient, and span is 0.3-0.6; F is expanding equipment power energy settings, and unit is N; σ
bfor steel pipe yield strength, unit is MPa; β is the gradient of cone; μ is the coefficient of friction between arc block and steel pipe; T is thickness of steel pipe, and unit is mm; The unit of L is mm;
The cylindrical curvature C of arc block meets:
in formula, R is the target inside radius after pipe expanding, and unit is mm; δ
tfor the caliber coefficient of resilience; T is thickness of steel pipe, and unit is mm;
(2) according to the axial length L of thickness of steel pipe T and arc block adjust expanding deformation effect offset from
described expanding deformation effect offset is to the distance of correct roller group switching centre along steel pipe axial direction from cylindrical tube tail end from Lab;
Adjust expanding deformation effect district correct roller group location dimension Rb to meet:
in formula, R is the target inside radius after pipe expanding, and unit is mm; T is thickness of steel pipe, and unit is mm; δ
tfor the caliber coefficient of resilience; Described expanding deformation effect district correct roller group location dimension Rb is the distance between the top roll periphery top of correct roller group and steel pipe center line;
Location dimension Rcd is identical with the target inside radius R after pipe expanding for adjustment rear support roller group, and described rear support roller group location dimension Rcd is the distance from the top roll periphery top of rear support roller group to steel pipe center line;
(3) expanding equipment to cone apply axial tension to pull cone in the axial direction, complete successively the pipe head of steel pipe, body, pipe tail expanding, wherein:
Controlling the axial stroke H1 of described cone when pipe is first and pipe tail is expanding is:
in formula, R is the target inside radius after pipe expanding, and T is thickness of steel pipe, and Dwin is the minimum outer diameter that cylindrical tube is collapsible to, and unit is mm; δ
tfor the caliber coefficient of resilience; β is the gradient of cone;
Controlling the axial stroke H2 of described cone when body is expanding is:
in formula, H1 is the axial stroke H1 of cone when pipe is first and pipe tail is expanding, and R is the target inside radius after pipe expanding, and unit is mm; β is the gradient of cone; e
1for the pipe head of setting and the enlarging rate of pipe tail, e
2for the enlarging rate of body;
After completing axial stroke H1 and H2, keep cone motionless in the axial direction, after expanding equipment still keeps applying axial tension one time, then remove axial tension.
The online expanding full circle equipment adopted in the technical program improves expander die (i.e. some arc blocks surround cylindrical tube) on existing online expanding equipment, that is, do not re-use general arc block, but axial length L and the cylindrical curvature of expander die (that is arc block) is determined according to parameters such as the inside radius of the grade of steel (being reflected by yield strength) of supplied materials steel pipe, wall thickness and expanding rear steel pipe, namely different supplied materials pipes adopts arc block suitable with it to carry out expanding and full circle.
In addition, in order to realize object of the present invention, produce high-quality welded tube, the technical program also adjusts to expanding deformation effect offset from Lab, expanding deformation effect district correct roller group location dimension Rb and these three device parameters of rear support roller group location dimension Rcd and controls, thus realize correct roller group and rear support roller group to the constraint of steel pipe and the restriction to steel pipe resilience, under the condition that these three device parameters meet the demands, just carry out expanding and full circle operation online.
In addition, the technical program also needs the concrete condition according to supplied materials steel pipe when expanding full circle, control at pipe end expanding (comprising pipe first expanding expanding with pipe tail) and the expanding axial stroke to expanding cone of body respectively, different enlarging rate is designed at pipe end and pipe tail, overcome the difference of body and pipe end tubulation boundary condition, the circularity quality of unified full pipe, particularly based on the consideration to steel pipe cold forming characteristic, after axial stroke completes, no longer as in the prior art, remove the axial tension to cone at once, but keep axial tension a period of time, thus allow steel pipe fully complete whole plastic deformation circumferentially, to realize the object of balance and the inherent residual stress of even steel pipe.
The expanding equipment adopted due to the technical program there is no large difference with existing expanding equipment in other respects, therefore the technical program is no longer introduced expanding equipment and its using method herein, and concrete expanding equipment is introduced in detailed description of the invention hereafter.
Because several arc blocks surrounding cylindrical tube have certain interval each other, therefore the external diameter of this cylindrical tube can change according to the size in gap, can to be placed in steel pipe to make cylindrical tube and and there is between steel pipe certain gap, need minimum outer diameter Dwin≤2R that cylindrical tube is collapsible to, in the technical program, preferably, Dwin≤2R-50.Certainly, the unit of Dwin and R should be unified, generally adopts mm.
In order to farthest complete steel pipe in whole plastic deformation circumferentially, inventor is by lot of experiments and calculating, and after having devised axial stroke H1 and H2 quantitatively, expanding equipment keeps the time t applying axial tension:
In formula, T is thickness of steel pipe, and R is the target inside radius after pipe expanding, and unit is mm; σ
bfor steel pipe yield strength, unit is MPa; The unit of t is s.
This is according to the preferred version of supplied materials quantitative steel pipe determination pulling force retention time t, and it can be made to have better implementation result than the mentioned above axial force of a period of time that keeps qualitatively.
Consider that the pipe deformation of higher yield strength is more difficult, easily there is resilience in larger-diameter steel pipe, the factor such as the steel pipe resilience of relatively thick is less, number of times pipe end (comprising pipe head and pipe tail) can also being selected expanding according to the actual conditions of supplied materials steel pipe, selects in 1-3 underrange.When general high-yield strength, light-wall pipe pipe end are expanding, expanding number of times is at 2-3 time.
The caliber coefficient of resilience δ related in the technical program
tdetermined by grade of steel and structural constituent, generally its span is 0.2-0.5%.
Another object of the present invention is to design a kind of expanding for steel pipe total length time the expander die of online full circle method, it comprises the arc block that several surround cylindrical tube jointly, this arc block is different from the arc block in existing expander die, it is provided with the groove of accommodating weld seam on the arc block that steel pipe seam position is corresponding, and:
The axial length L of arc block meets:
in formula, k is empirical coefficient, and span is 0.3-0.6; F is expanding equipment power energy settings, and unit is N; σ
bfor steel pipe yield strength, unit is MPa; β is the gradient of cone; μ is the coefficient of friction between arc block and steel pipe; T is thickness of steel pipe, and unit is mm; The unit of L is mm;
The cylindrical curvature C of arc block meets:
in formula, R is the target inside radius after pipe expanding, and unit is mm; δ
tfor the caliber coefficient of resilience; T is thickness of steel pipe, and unit is mm.
Online full circle method when adopting steel pipe total length of the present invention expanding, can while automatic diameter-enlarging, realize the automatic full circle of steel pipe total length, especially pipe end full circle effect is more remarkable, make expanding after welded tube out-of-roundness extreme difference value be generally no more than 0.5%D, meet stricter Norway DNV, Canadian CSA and CNOOC ocean at present and manage the requirement of corresponding specification, be better than the requirement of the out-of-roundness ratio 0.6% in U.S. API standard and Western China gas east transferring technology specification.
Adopt expander die of the present invention in online full circle method when steel pipe total length is expanding, expander die can be made to be applicable to the supplied materials steel pipe of various concrete specification, and form good suitability with various supplied materials steel pipe, improve the effect that online full circle is expanding.
Accompanying drawing explanation
Fig. 1 be steel pipe total length of the present invention expanding time the structural representation of expanding equipment that adopts under a kind of embodiment of online full circle method.
Fig. 2 be steel pipe total length of the present invention expanding time the radial cross-section of expander die under a kind of embodiment that adopt of online full circle method.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment technical solutions according to the invention are made and describing in detail further, but this explanation does not form the improper restriction for technical solution of the present invention.
Fig. 1 shows the structure of the online expanding equipment adopted in the present embodiment.As shown in Figure 1, this online expanding equipment is disposed with expansion front support roller 3 along the direct of travel of steel pipe 1, correct roller group 10, drag link sleeve backing roll 11 and rear support roller group 12 and 13, expander die 5 is provided with in steel pipe 1, cone 6 is provided with in expander die 5, the gradient of cone is β, to install with expander die 5 to make cone 6 and mate, also between cone 6 and expander die 5, be provided with taper liner block 16, one end of pull bar 9 and cone 6 be fixedly connected with, the other end is fixedly connected with cylinder component 14, in order to carry out axial limiting to expander die 5, be provided with at the rear of expander die 5 and support baffle ring 7, pull bar 9 overcoat has drag link sleeve 8, send clamp 2 and correct roller group 10 order realization pinching steel pipe 1 to, control unit 15 controls whole online expanding equipment.
Above-mentioned online expanding equipment applies radial load by the axial feed of cone to steel pipe, thus it is expanding to complete steel pipe.
Fig. 2 shows the radial cross-section of expander die of the present invention under a kind of embodiment.As shown in Figure 2, the cylindrical pipe body shape of this expander die, cylindrical tube is surrounded by several arc blocks 4, between each arc block 4, there is certain gap, wherein one piece of arc block has groove 41, expanding with in full circle process online, this groove should be corresponding with the weld seam of steel pipe, and the weld seam of steel pipe is just in time placed in this groove 41.
In the present embodiment, supplied materials steel pipe is X70M steel pipe, and its wall thickness T is 21mm, and the target external diameter after expanding is 1016mm, therefore, expanding rear target inside radius R=(1016/2-21)=487mm, yield strength average σ
bfor 540MPa, caliber coefficient of resilience δ
tbe 0.005.
The expanding power F of permission of the online expanding equipment adopted is 10MN.
For this supplied materials steel pipe, take following step to its carry out total length expanding time full circle:
1. set the dimensional parameters of expander die:
A. the Dwin Ying Dang≤2R-50 of expander die, 2R-50=924mm in the present embodiment, therefore chooses Dwin=920mm.
B. the axial length L of arc block in expander die is determined:
C. the cylindrical curvature C of arc block is determined:
2. determine that expanding deformation effect offset is from Lab according to supplied materials steel pipe, expanding deformation effect district correct roller group location dimension Rb and rear support roller group location dimension Rcd, as shown in Figure 1, expanding deformation effect offset is the distance of axial direction from the tail end of expander die 5 to the center of correct roller group 10 along steel pipe 1 from Lab, expanding deformation effect district correct roller group location dimension Rb is the distance between the top roll periphery top of correct roller group 10 and steel pipe center line, rear support roller group location dimension Rcd is from rear support roller group 12, the top roll periphery top of 13 is to the distance of steel pipe center line:
Rcd=R=487mm
Then adjust equipment according to the above-mentioned parameter determined, as shown in Figure 1, the roller group gap (distance between top roll and lower roll) of each roller group also should adjust the wall thickness T=21mm equaling steel pipe simultaneously.
3. the axial stroke H1 of cone and the axial stroke H2 of cone when carrying out expanding to body when determining to carry out expanding to pipe end according to supplied materials steel pipe:
4. the retention time t of axial tension after completing according to supplied materials steel pipe determination axial stroke:
Please continue to refer to Fig. 1, use the expanding module determined in the present embodiment, after completing the adjustment of expanding equipment, complete whole online expanding full circle process according to following step:
(1) be basic conllinear by the center adjustment of the center of steel pipe 1 and drag link sleeve 8;
(2) rotate adjustment steel pipe 1, make weld seam just in time be in the groove 41 of arc block;
(3) control unit 15 startup starts expanding;
(4) pipe head arrival expander die 5 place under the pinching sending clamp 2 to of steel pipe 1, cylinder component 14 pulls pull bar 9, and then pull cone 6 to move axially to the right, complete axial stroke H1, expander die 5 is in cone 6 with under the effect supporting baffle ring 7 in the process, opens up into the expanding position of pipe end, realizes the first time of steel pipe 1 pipe head expanding, after axial stroke H1 completes, control unit 15 controls cylinder component 14 time delay 2s and removes pulling force again; According to technique needs, pipe head can suspend and sends to forward, rests on original position and implements 1-3 time and expandingly to strain with the homogeneous state of stress;
(5) complete pipe first expanding after, steel pipe 1 is sent to clamp 2 to be continued to send to forward, and tube wall enters in the roller group gap of correct roller group 10, starts set round;
(6) control unit 15 control cylinder component 14 pull cone 6 to move axially H2 to carry out body expanding, now, the pipeline section in expanding deformation effect district is subject to the correcting of correct roller group 10, realize accurate set round, simultaneously, just in the appropriate section of expanding flow pipeline section on steel pipe 1, due to pining down by correct roller group 10, the corresponding increase and decrease of local equivalents stress, thus realize the difference of local springback capacity, have also been obtained set round to a certain extent, after completing axial stroke H2, control unit 15 controls cylinder component 14 time delay 2s and removes pulling force again;
(7) before pipe tail arrives expander die, send clamp 2 to and discharge, rely on correct roller group 10 to drive and transport forward;
(8) control unit 15 controls cylinder component 14 and pulls cone 6 to complete axial stroke H1, thus it is expanding to carry out pipe tail, equally, after axial stroke H1 completes, control unit 15 controls cylinder component 14 time delay 2s and removes pulling force again, and according to technique needs, pipe tail is expanding also can carry out 1-3 time;
(9) complete pipe tail expanding after, steel pipe continue front given, corresponding pipe rear is sent in the gap T of correct roller group 10, completes full circle operation.
Through aforesaid operations, the pipe of X70M steel pipe is first, the out-of-roundness ratio of pipe tail and body all lower than 0.5%, meet process quality designing requirement.
That enumerates it should be noted that above is only specific embodiments of the invention, obviously the invention is not restricted to above embodiment, has many similar changes thereupon.If all technical schemes that those skilled in the art directly derives from content disclosed by the invention or associates, protection scope of the present invention all should be belonged to.
Claims (6)
1. online full circle method when steel pipe total length is expanding, it comprises:
(1) some arc blocks are set in steel pipe, each arc block is close to steel pipe inside radius ground and is arranged in a circumferential direction to form a cylindrical tube, be provided with expanding cone in described cylindrical tube, the arc block that steel pipe seam is corresponding be provided with the groove of accommodating weld seam, wherein
The axial length L of arc block meets:
in formula, k is empirical coefficient, and span is 0.3-0.6; F is expanding equipment power energy settings, and unit is N; σ
bfor steel pipe yield strength, unit is MPa; The β coefficient of friction that to be the gradient of cone: μ be between arc block and steel pipe; T is thickness of steel pipe, and unit is mm; The unit of L is mm;
The cylindrical curvature C of arc block meets:
in formula, R is the target inside radius after pipe expanding, and unit is mm; δ
tfor the caliber coefficient of resilience; T is thickness of steel pipe, and unit is mm;
(2) expanding deformation effect offset is adjusted from Lab according to the axial length L of thickness of steel pipe T and arc block:
described expanding deformation effect offset is to the distance of correct roller group switching centre along steel pipe axial direction from cylindrical tube tail end from Lab;
Adjust expanding deformation effect district correct roller group location dimension Rb to meet:
in formula, R is the target inside radius after pipe expanding, and unit is mm; T is thickness of steel pipe, and unit is mm; δ
tfor the caliber coefficient of resilience; Described expanding deformation effect district correct roller group location dimension Rb is the distance between the top roll periphery top of correct roller group and steel pipe center line;
Location dimension Rcd is identical with the target inside radius R after pipe expanding for adjustment rear support roller group, and described rear support roller group location dimension Rcd is the distance from the top roll periphery top of rear support roller group to steel pipe center line;
(3) expanding equipment to cone apply axial tension to pull cone in the axial direction, complete successively the pipe head of steel pipe, body, pipe tail expanding, wherein
Controlling the axial stroke H1 of described cone when pipe is first and pipe tail is expanding is:
in formula, R is the target inside radius after pipe expanding, and T is thickness of steel pipe, and Dwin is the minimum outer diameter that cylindrical tube is collapsible to, and unit is mm; δ
tfor the caliber coefficient of resilience; β is the gradient of cone;
Controlling the axial stroke H2 of described cone when body is expanding is:
in formula, H1 is the axial stroke H1 of cone when pipe is first and pipe tail is expanding, and R is the target inside radius after pipe expanding, and unit is mm; β is the gradient of cone; e
1for the pipe head of setting and the enlarging rate of pipe tail, e
2for the enlarging rate of body;
After completing axial stroke H1 and H2, keep cone motionless in the axial direction, after expanding equipment still keeps applying axial tension one time, then remove axial tension.
2. online full circle method when steel pipe total length as claimed in claim 1 is expanding, it is characterized in that, the minimum outer diameter Dwin that described cylindrical tube is collapsible to meets Dwin≤2R-50.
3. online full circle method when steel pipe total length as claimed in claim 1 is expanding, is characterized in that, after completing described axial stroke H1 and H2, the time t that expanding equipment maintenance applies axial tension is:
In formula, T is thickness of steel pipe, and R is the target inside radius after pipe expanding, and unit is mm; σ
bfor steel pipe yield strength, unit is MPa; The unit of t is s.
4. online full circle method when steel pipe total length as claimed in claim 1 is expanding, is characterized in that, pipe expanding number of times that is first and pipe tail is respectively 1-3 time.
5. online full circle method when steel pipe total length as claimed in claim 1 is expanding, is characterized in that, caliber coefficient of resilience δ
tspan be 0.2-0.5%.
6. an expander die for online full circle method time expanding for steel pipe total length, it comprises the arc block that several surround cylindrical tube jointly, it is characterized in that:
The arc block that steel pipe seam position is corresponding is provided with the groove of accommodating weld seam, and
The axial length L of arc block meets:
in formula, k is empirical coefficient, and span is 0.3-0.6; F is expanding equipment power energy settings, and unit is N; σ
bfor steel pipe yield strength, unit is MPa; β is the gradient of cone; μ is the coefficient of friction between arc block and steel pipe; T is thickness of steel pipe, and unit is mm; The unit of L is mm;
The cylindrical curvature C of arc block meets:
in formula, R is the target inside radius after pipe expanding, and unit is mm; δ
tfor the caliber coefficient of resilience; T is thickness of steel pipe, and unit is mm.
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| CN201310231954.9A CN104226833B (en) | 2013-06-09 | 2013-06-09 | A kind of online full circle method when steel pipe total length is expanding and expander die |
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| CN104675413A (en) * | 2015-02-16 | 2015-06-03 | 济南轨道交通集团有限公司 | Tunnel segment rounder and using method thereof |
| CN109591132A (en) * | 2019-01-30 | 2019-04-09 | 湖南银山竹业有限公司 | A kind of expansion circle method and apparatus of thick bamboo tube |
| CN110722065A (en) * | 2019-10-24 | 2020-01-24 | 番禺珠江钢管（珠海）有限公司 | Local hydraulic pressure expanding device |
| CN111842673A (en) * | 2020-07-22 | 2020-10-30 | 中国石油天然气集团有限公司 | Method for improving geometric dimension precision of pipe body and pipe end of straight welded pipe |
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| CN111842673A (en) * | 2020-07-22 | 2020-10-30 | 中国石油天然气集团有限公司 | Method for improving geometric dimension precision of pipe body and pipe end of straight welded pipe |
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|---|---|
| CN104226833B (en) | 2016-03-30 |
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