CN106294940A - A kind of large-scale bending in space round steel pipe multiple operation cumulative error control method - Google Patents
A kind of large-scale bending in space round steel pipe multiple operation cumulative error control method Download PDFInfo
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- CN106294940A CN106294940A CN201610613020.5A CN201610613020A CN106294940A CN 106294940 A CN106294940 A CN 106294940A CN 201610613020 A CN201610613020 A CN 201610613020A CN 106294940 A CN106294940 A CN 106294940A
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Abstract
The invention discloses a kind of large-scale bending in space round steel pipe multiple operation cumulative error control method.Going out one according to national standard at bending round steel pipe assembly plane machining and adjust angle, next section of bend pipe to be assembled spatially shows as the assembled coordinate origin rotation one around local and adjusts angle；Adjusting angle is the axle rotation around splicing plane, can rotate around axle and axle simultaneously；The distance of the three-dimensional coordinate after adjustment and design three-dimensional coordinate, as object function, using the requirement in specification as constraints, sets up the mathematical model that cumulative error optimizes；Design a model three-dimensional coordinate parameter in conjunction with the large-scale curved tube in space, using two groups of parameters of the coordinate after design point three-dimensional coordinate and actual assembly as object function, substitute into curvature of space pipe cumulative error control mathematical model, be calculated the optimal solution adjusting angle.The present invention is applicable to the large spans such as monster fair shop, transport hub, Olympic Games sports ground, the control of major diameter curvature of space round steel pipe processing cumulative error.
Description
Technical field
The present invention relates to curved tube cumulative error control method, particularly relate to a kind of large-scale bending in space round steel pipe multiplexing
Sequence cumulative error control method.
Background technology
Not only extensive in gas-liquid transport, machinery, chemical industry, nuclear power along with the development of modern industry various bend pipe parts
Application, applies more extensive in modern architecture industry, and particularly large span space curved tube steel construction is more and more
Be applied to monster fair shop, transport hub, Olympic Games sports ground etc..
Curvature of space pipe steel construction, when bending machining, uses segmentation pointwise close approximation method, at space circular arc
Part, chooses space coordinates, in these space coordinates, space circular arc is carried out salvage, is simplified to approximation
The circular arc of plane, is bent by the bending method of plane circular arc, the circular arc pipe fitting assembly weldering then bent a section a section
Pick up, complete the making of whole section of curvature of space steel pipe.The large span space bent pipe construction stage is many, operating mode complicated, foozle
Inevitable with stitching error, ultimately result in space bent pipe and be difficult to accurately join the two sections of a bridge, etc.
The large span space bent pipe construction stage is many, and operating mode is complicated, and with equipment, material, personnel, method, measurement and environment
Being correlated with etc. the multiple error component that affects, error is unavoidable.Curvature of space pipe steel construction has finally spliced generation
Cumulative error can be represented by the formula, and wherein causes manufacture rise and the design of round steel pipe due to resilience etc. during bending pipes
The deviation of the deviation of rise, factory length and design length, is defined as foozle here, uses f1Represent；Each section of pipe
Connected by butt weld, be welded into an entirety, the error that here seam deformation and the impact of residual stress can be caused,
It is defined as assembled error, uses f2Represent；fΔθRepresent error produced by the angle Δ θ of sectional bent pipe end face and its center axis；
fetseRepresent the error that other factors produce；kn(n=1,2,3,4) represents the respective weights factor.
F=k1f1+k2f2+k3fΔθ+k4fetse
At present space bent pipe fabrication processing mainly takes two kinds for the error produced after bend pipe processing and manufacturing
Control method: the first, improve the accuracy of manufacture of each sectional bent pipe in engineering further and control welding deformation.But bend pipe
Often increasing an accuracy class during manufacture, the difficulty of processing can increase in geometry level, and the requirement to process equipment and instrument will
Higher.The second, takes the machinery after construction to correct and the method for flame straightening to the space bent pipe that mismachining tolerance is excessive
Reach the range of error allowed.This can increase unnecessary time cost and human cost, and produces in causing pipe
Residual stress, affects space bent pipe linear.
Summary of the invention
It is an object of the invention to provide a kind of large-scale bending in space round steel pipe multiple operation cumulative error control method, it is not necessary to
Improve bend pipe accuracy of manufacture grade, it is adaptable to the control of large span, major diameter curvature of space round steel pipe processing cumulative error.
In order to reach foregoing invention purpose, the step of the technical solution used in the present invention is as follows:
1) according to requirement to end surfaces Yu axis verticality in national standard specification, the angle of definition end surfaces and axis
Δ θ is for adjusting angle；
Go out one at bending round steel pipe assembly plane machining and adjust angle Δ θ, the locus of bend pipe to be assembled is adjusted
Whole so that cumulative error reduces and meets the requirement in national standard specification；
After processing adjustment angle Δ θ, next section of bend pipe to be assembled spatially shows as the assembled coordinate origin rotation around local
Turn one and adjust angle Δ θ；
Described adjustment angle Δ θ is around splicing planeAxle rotates, and in national standard specification, it simultaneously can be aroundAxle
WithAxle rotates；
The rotation formula of space coordinate transformation is:
In formula:For around axle in the face anglec of rotation；For around axle in the face anglec of rotation；For around axle in the face anglec of rotation；
WhenTime the least, coordinate transform simplified formula is:
In formula, (x ", y ", z ")TFor the coordinate after actual assembly, (x ', y ', z ')TFor being adjusted the seat after angle and optimizing
Mark, Δ x, Δ y, Δ z are origin increment.
The ranging offset amount of the actual three-dimensional coordinate point after optimization and design three-dimensional coordinate point that will be adjusted is as optimization
Target, sets up the object function of precision optimizing:
F=min{ (x '-X)2+(y′-Y)2+(z′-Z)2}
Wherein: (X, Y, Z)TFor design point three-dimensional coordinate；The object function constraint equation of precision optimizing is national standard rule
In model to adjust angle Δ θ technology requirement, then:
In formula: d is bend pipe external diameter；
In conjunction with above formula, for the distance using the three-dimensional coordinate after adjustment and design three-dimensional coordinate as object function, with specification
In requirement as constraints, set up the mathematical model that cumulative error optimizes.
2) curved tube cumulative error in application space controls parameter detecting system, it is thus achieved that the large-scale curved tube in space each
The three-dimensional coordinate parameters such as the relative position of the central axis point coordinates of Duan Shiji processing model and end face and central axis.
Design a model three-dimensional coordinate parameter in conjunction with the large-scale curved tube in space, with (X, Y, Z)TFor design point three-dimensional coordinate and
(x″,y″,z″)TFor two groups of parameters of the coordinate after actual assembly as object function, substitute into curvature of space pipe cumulative error
Control mathematical model, is calculated the optimal solution adjusting angle Δ θ.
When adjusting, angle Δ θ optimal solution value is excessive or adjustment rear space structure is unsatisfactory for G1 continuously, is ensureing large space knot
Structure entirety meets the upper of the basis of design requirement, is assigned to adjustment angle Δ θ be adjusted, finally in several bend pipe assembly plane
Realize being decreased or even eliminated the purpose of cumulative error.
Described go out one at assembled plane machining and adjust angle Δ θ, go out an adjustment by flame cutting assembly plane machining
Angle Δ θ, is adjusted the locus of bend pipe to be assembled.
Described go out one at assembled plane machining and adjust angle Δ θ, by adjusting groove gap, cross section shape between pipeline section
Shape, controls pipe fitting end face and the perpendicularity Δ 1 of axis and end surfaces and axis angle Δ θ, realizes bend pipe to be assembled
Locus is adjusted so that cumulative error reduces the purpose even eliminating cumulative error.
Described national standard specification, is according to " code for acceptance of construction quality of steel structures GB 50205-2001 " middle finger
Go out, within the perpendicularity Δ 1 of pipe fitting end face and axis is recommended as 3mm, within being 5mm to the maximum, i.e. end surfaces and axis angle Δ θ
Allowing the deviation in prescribed limit, definition end surfaces is adjustment angle with the angle Δ θ of axis.
The invention have the advantages that:
1) accuracy of manufacture grade of every section of bend pipe is the most excessively limited.
2) welding deformation is the most excessively controlled.
3) as long as the splicing of any two ends bend pipe reaches in code requirement Discrepancy Control Area.
4) by making when assembly mismachining tolerance mutually compensate for technically, reduce process technology difficulty, reduce and produce into
This.
5) by going out an adjustment angle at assembled plane machining, the locus of bend pipe to be assembled is adjusted.
6) if adjusted, angle Δ θ optimal solution value is excessive or adjustment rear space structure is unsatisfactory for G1 continuously, is ensureing large-scale sky
Between structure entirety meet design require basis upper, by this control Rational Parameters be assigned in several bend pipe assembly plane carry out
Adjust.
7) by adjusting groove gap, shape of cross section etc. between pipeline section, the perpendicularity of pipe fitting end face and axis is controlled
Δ l and end surfaces and axis angle Δ θ, and then realize controlling error, remaining answering will not be produced in reducing operation easier, and pipe
Power, does not affect space bent pipe linear.
The present invention is applicable to large span, the major diameter curvature of space such as monster fair shop, transport hub, Olympic Games sports ground
The control of round steel pipe processing cumulative error.
Accompanying drawing explanation
Fig. 1 is the large-scale bending in space round steel pipe structural representation.
Fig. 2 is that the large-scale bending in space round steel pipe mismachining tolerance controls schematic diagram.
Fig. 3 is pipe fitting end face and the perpendicularity Δ l of axis and end surfaces and axis angle Δ θ schematic diagram.
Fig. 4 is global coordinate and splicing plane local coordinate system.
Detailed description of the invention
The present invention is described further with embodiment below in conjunction with the accompanying drawings.
Curvature of space round steel pipe manufacture method, sequentially includes the following steps:
First step setting-out: on the basis of microcomputer modelling, intercepts component true form from model, enters by computer
Row setting-out is individually taken out the component divided on computers, measures chord length and rise, as processing numerical value.Setting-out inspection is closed
After lattice, make necessary angle, notch, making model and moulding bed model by technological requirement.
Second order bends shapes: utilize large-sized hydraulic press carry out machinery cold working on particular manufacturing craft or use intermediate frequency curved
Pipe machine carries out hot worked processing method, by every section of bend pipe machine-shaping.
3rd step segmentation is pre-assembled: semi-finished product and part that preparation is completed are assembled into component or parts by drawing regulation
(as shown in Figure 1).
A kind of large-scale bending in space round steel pipe multiple operation cumulative error control method, the step of the method is as follows:
1) according to requirement to end surfaces Yu axis verticality in national standard specification, the angle of definition end surfaces and axis
Δ θ is for adjusting angle；
Go out one at bending round steel pipe assembly plane machining and adjust angle Δ θ, the locus of bend pipe to be assembled is adjusted
Whole so that cumulative error reduces and meets the requirement in national standard specification；
After processing adjustment angle Δ θ, next section of bend pipe to be assembled spatially shows as the assembled coordinate origin rotation around local
Turn one and adjust angle Δ θ；
Described adjustment angle Δ θ is around splicing planeAxle rotates, and in national standard specification, it simultaneously can be aroundAxle
WithAxle rotates (as shown in Figure 4)；
The rotation formula of space coordinate transformation is:
In formula:For around axle in the face anglec of rotation；For around axle in the face anglec of rotation；For around axle in the face anglec of rotation；
WhenTime the least, coordinate transform simplified formula is:
In formula, (x ", y ", z ")TFor the coordinate after actual assembly, (x ', y ', z ')TFor being adjusted the seat after angle and optimizing
Mark, Δ x, Δ y, Δ z are origin increment.
The ranging offset amount of the actual three-dimensional coordinate point after optimization and design three-dimensional coordinate point that will be adjusted is as optimization
Target, sets up the object function of precision optimizing:
F=min{ (x '-X)2+(y′-Y)2+(z′-Z)2}
Wherein: (X, Y, Z)TFor design point three-dimensional coordinate；The object function constraint equation of precision optimizing is national standard rule
In model to adjust angle Δ θ technology requirement, then:
In formula: d is bend pipe external diameter；
In conjunction with above formula, for the distance using the three-dimensional coordinate after adjustment and design three-dimensional coordinate as object function, with specification
In requirement as constraints, set up the mathematical model that cumulative error optimizes.
2) curved tube cumulative error in application space controls parameter detecting system, it is thus achieved that the large-scale curved tube in space each
The three-dimensional coordinate parameters such as the relative position of the central axis point coordinates of Duan Shiji processing model and end face and central axis.
Design a model three-dimensional coordinate parameter in conjunction with the large-scale curved tube in space, with (X, Y, Z)TFor design point three-dimensional coordinate and
(x″,y″,z″)TFor two groups of parameters of the coordinate after actual assembly as object function, substitute into curvature of space pipe cumulative error
Control mathematical model, is calculated the optimal solution adjusting angle Δ θ.
When adjusting, angle Δ θ optimal solution value is excessive or adjustment rear space structure is unsatisfactory for G1 continuously, is ensureing large space knot
Structure entirety meets the upper of the basis of design requirement, is assigned to adjustment angle Δ θ be adjusted in several bend pipe assembly plane. and final
Realize being decreased or even eliminated the purpose of cumulative error.
Described go out one at assembled plane machining and adjust angle Δ θ, go out an adjustment by flame cutting assembly plane machining
Angle Δ θ, is adjusted the locus of bend pipe to be assembled.
An adjustment angle is gone out at assembled plane machining, by adjusting groove gap, horizontal stroke between pipeline section as in figure 2 it is shown, described
Cross sectional shape, controls pipe fitting end face and the perpendicularity Δ 1 of axis and end surfaces and axis angle Δ θ, realizes to be assembled
The locus of bend pipe is adjusted so that cumulative error reduces the purpose even eliminating cumulative error.
As it is shown on figure 3, after processing adjustment angle, next section of bend pipe to be assembled spatially shows as the assembled coordinate system around local
Initial point rotates one and adjusts angle.As a example by the splicing of two sections of space bent pipes, in Fig. 3 shown in dotted line, for the ideal position of space bent pipe,
A1 is preferable splicing plane, and B1 is ideal space position；Solid line is real space bend pipe position, and A2 is not for use the inventive method
Shown in splicing plane, B2 be do not use the present invention real space bend pipe splicing after position；A3 is for using the inventive method processing
Go out adjustment splicing plane, Δ θ for adjust angle, B3 be use the present invention real space bend pipe splicing after position.Make error
Reducing, after splicing, actual three-dimensional coordinate tends to ideal design coordinate.
Described national standard specification, is according to " code for acceptance of construction quality of steel structures GB 50205-2001 " middle finger
Go out, within the perpendicularity Δ 1 of pipe fitting end face and axis is recommended as 3mm, within being 5mm to the maximum, i.e. end surfaces and axis angle Δ θ
Allowing the deviation in prescribed limit, definition end surfaces is adjustment angle with the angle Δ θ of axis.
Claims (5)
1. the large-scale bending in a space round steel pipe multiple operation cumulative error control method, it is characterised in that the step of the method is such as
Under:
1) according to requirement to end surfaces Yu axis verticality in national standard specification, the angle Δ θ of definition end surfaces and axis
For adjusting angle；
Go out one at bending round steel pipe assembly plane machining and adjust angle Δ θ, the locus of bend pipe to be assembled is adjusted, makes
Obtain cumulative error reduce and meet the requirement in national standard specification；
After processing adjustment angle Δ θ, next section of bend pipe to be assembled spatially shows as the assembled coordinate origin around local and rotates one
Individual adjustment angle Δ θ；
Described adjustment angle Δ θ is around splicing planeAxle rotates, and in national standard specification, it simultaneously can be aroundAxle andAxle
Rotate；
The rotation formula of space coordinate transformation is:
In formula:For around axle in the face anglec of rotation；For around axle in the face anglec of rotation；For around axle in the face anglec of rotation；
WhenTime the least, coordinate transform simplified formula is:
In formula, (x ", y ", z ")TFor the coordinate after actual assembly, (x ', y ', z ')TFor being adjusted the coordinate after angle and optimizing, Δ
X, Δ y, Δ z are origin increment.
The ranging offset amount with design three-dimensional coordinate point of the actual three-dimensional coordinate point after optimization will be adjusted as optimization aim,
Set up the object function of precision optimizing:
F=min{ (x '-X)2+(y′-Y)2+(z′-Z)2}
Wherein: (X, Y, Z)TFor design point three-dimensional coordinate；The object function constraint equation of precision optimizing is right in national standard specification
Adjust the technology requirement of angle Δ θ, then:
In formula: d is bend pipe external diameter；
In conjunction with above formula, for the distance using the three-dimensional coordinate after adjustment and design three-dimensional coordinate as object function, with in specification
Require, as constraints, to set up the mathematical model that cumulative error optimizes.
2) curved tube cumulative error in application space controls parameter detecting system, it is thus achieved that each section of reality of the large-scale curved tube in space
The three-dimensional coordinate parameters such as the relative position of the central axis point coordinates of border processing model and end face and central axis.
Design a model three-dimensional coordinate parameter in conjunction with the large-scale curved tube in space, with (X, Y, Z)TFor design point three-dimensional coordinate and (x ",
y″,z″)TTwo groups of parameters for the coordinate after actual assembly control as object function, substitution curvature of space pipe cumulative error
Mathematical model, is calculated the optimal solution adjusting angle Δ θ.
A kind of large-scale bending in space round steel pipe multiple operation cumulative error control method the most according to claim 1, its feature
It is: when adjusting, angle Δ θ optimal solution value is excessive or adjustment rear space structure is unsatisfactory for G1 continuously, is ensureing that large space structure is whole
Body meets the upper of the basis of design requirement, is assigned to adjustment angle Δ θ be adjusted in several bend pipe assembly plane, finally realizes
The purpose of cumulative error is decreased or even eliminated.
A kind of large-scale bending in space round steel pipe multiple operation cumulative error control method the most according to claim 1, its feature
It is, described go out one at assembled plane machining and adjust angle Δ θ, go out one by flame cutting assembly plane machining and adjust angle Δ
θ, is adjusted the locus of bend pipe to be assembled.
A kind of large-scale bending in space round steel pipe multiple operation cumulative error control method the most according to claim 1, its feature
It is, described go out one at assembled plane machining and adjust angle Δ θ, by adjusting groove gap, shape of cross section between pipeline section, come
Control pipe fitting end face and the perpendicularity Δ 1 of axis and end surfaces and axis angle Δ θ, realize the space bit to bend pipe to be assembled
Put and be adjusted so that cumulative error reduces the purpose even eliminating cumulative error.
A kind of large-scale bending in space round steel pipe multiple operation cumulative error control method the most according to claim 1, its feature
It is: described national standard specification, is to point out according in " code for acceptance of construction quality of steel structures GB 50205-2001 ",
Within the perpendicularity Δ 1 of pipe fitting end face and axis is recommended as 3mm, within being 5mm to the maximum, i.e. end surfaces is permitted with axis angle Δ θ
Being permitted the deviation in prescribed limit, definition end surfaces is adjustment angle with the angle Δ θ of axis.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107841932A (en) * | 2017-10-19 | 2018-03-27 | 中国建筑土木建设有限公司 | Method for manufacturing, installing and positioning tied arch bridge arch rib segment |
| CN109238157A (en) * | 2018-09-10 | 2019-01-18 | 耿佳钰 | Turntable radius and the indexable increment of coordinate detection method of setting-up eccentricity four and detection device |
| CN112781490A (en) * | 2020-12-25 | 2021-05-11 | 南京工业大学 | Method for accurately measuring planar free bending forming dimension of pipe |
| CN115171820A (en) * | 2022-06-29 | 2022-10-11 | 成都飞机工业（集团）有限责任公司 | Accurate dynamic compensation method for bending forming of space continuous multi-bend component |
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| CN107841932A (en) * | 2017-10-19 | 2018-03-27 | 中国建筑土木建设有限公司 | Method for manufacturing, installing and positioning tied arch bridge arch rib segment |
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