CN108506588A - Non-uniform wall thickness tube bending forming method - Google Patents
Non-uniform wall thickness tube bending forming method Download PDFInfo
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- CN108506588A CN108506588A CN201810113222.2A CN201810113222A CN108506588A CN 108506588 A CN108506588 A CN 108506588A CN 201810113222 A CN201810113222 A CN 201810113222A CN 108506588 A CN108506588 A CN 108506588A
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- wall thickness
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- uniform
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/006—Rigid pipes specially profiled
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The present invention relates to a kind of non-uniform wall thickness tube bending forming methods, including：If the wall thickness of straight pipe uniform wall thickness tubing is δ0, wall thickness is δ on the outside of non-uniform wall thickness tubing to be bentw, and meet δw>δ0, non-uniform wall thickness tubing inside to be bent wall thickness is δn, and meet δn<δ0；It is δ to enable the outside wall thickness after bending formingw1, and meet δ surelyw1<δw, inside wall thickness is δn1, and meet δn1>δn；Enable δ=δw1=δn1, seek δwAnd δn, design wall thickness on the inside of design wall thickness and tubing on the outside of the tubing as before non-uniform wall thickness bending pipes；Wherein, δ is the target wall thickness of uniform wall thickness bend pipe；According to the δ soughtwAnd δnIt determines the size of non-uniform wall thickness tubing, and carries out bending forming, obtain the bend loss of uniform wall thickness.The present invention can realize uniform wall thickness after bending pipes.
Description
Technical field
The invention belongs to big diameter elbow forming technique field more particularly to a kind of non-uniform wall thickness tube bending forming sides
Method.
Background technology
Under normal conditions, when the big diameter elbows such as firepower, oil gas tubing is not bent, the wall thickness of circumferential each position is phase
Deng.After tube bending forming, due to compression on the inside of the tension of outside, wall thickness reduction on the outside of bend pipe, inside wall thickness is forced to thicken,
The thinned generation for be easy to causeing bend pipe leakage accident of wall thickness, baptism is proposed to safety in production on the outside of bend pipe.
In conventional uniform wall thickness tubing crooked forming method, bend pipe wall thickness change rate can be controlled by resistance method.Using resistance
When force method controls bend pipe wall thickness, high to the stability requirement of applied drag size, drag size precision is not also and its easily-controllable
System, and when application resistance is larger, the performance to entire bending machine is it is also proposed that baptism.Therefore, it is necessary to propose new
Bending tube forming method realizes bend pipe wall thickness control.
Invention content
The object of the present invention is to provide a kind of non-uniform wall thickness tube bending forming methods, by inciting somebody to action initial tubing to be bent
It is designed as non-uniform wall thickness, to realize the uniform purpose of wall thickness after bending pipes.
The present invention provides a kind of non-uniform wall thickness tube bending forming methods, including：
If the wall thickness of straight pipe uniform wall thickness tubing is δ0, wall thickness is δ on the outside of non-uniform wall thickness tubing to be bentw, and meet
δw>δ0, non-uniform wall thickness tubing inside to be bent wall thickness is δn, and meet δn<δ0；
It is δ to enable the outside wall thickness after bending formingw1, and meet δ surelyw1<δw, inside wall thickness is δn1, and meet δn1>δn；
Enable δ=δw1=δn1, seek δwAnd δn, design wall thickness and pipe on the outside of the tubing as before non-uniform wall thickness bending pipes
Design wall thickness on the inside of material；Wherein, δ is the target wall thickness of uniform wall thickness bend pipe；
According to the δ soughtwAnd δnIt determines the size of non-uniform wall thickness tubing, and carries out bending forming, obtain uniform wall thickness
Bend loss.
Further, this method specifically includes：
If the section inside and outside contour of non-uniform wall thickness tubing is respectively R by two radiuses2And R1Circle constitute, according to geometry
Relationship can obtain R1With R2Between relational expression be：
It is R to enable radius1And R2Two round centers of circle are respectively O1And O2, and O1With O2The distance between be db, according to geometry
Relationship has：
db=R1-R2-δn (2)
If A1' and A2' it is two regions for being divided into tubing section by neutral axis l, center of circle O1Distance to neutral axis l is
x1, with O1For origin, rectangular coordinate system is established；
Enable A1'=A2', according to A1'=A2' establish equation：
In formula (3), y1And y2Expression formula be respectively：
It is the radius of curvature of strain neutral layer after non-uniform wall thickness tube bending forming, r to enable R "1' for strain neutral layer extremely
Distance on the outside of bend pipe, r2' for the distance on the inside of strain neutral layer to bend pipe；
It is acquired according to geometry deformation condition：
In formula (6), R', r1'、r2' expression formula be respectively：
By formula (1), formula (2), formula (3), formula (4), formula (5), formula (6) and formula (7) even cube journey, R, R are substituted into1, δ, α's
Value solves equation group and obtains db, δn, δw, R2Value, and according to db, δn, δw, R2Value determine non-uniform wall thickness tubing to be bent
Size.
Further, non-uniform wall thickness tubing is welded by the curling of non-uniform thickness plank；Wherein, non-uniform thickness plate
The thickness distribution rule of material is according to non-uniform wall thickness tubing lateral wall δw, non-uniform wall thickness tubing madial wall δnAnd forming angle meter
It calculates and obtains.
According to the above aspect of the present invention, by non-uniform wall thickness tube bending forming method, wall thickness is equal after capable of realizing bending pipes
It is even.
Above description is only the general introduction of technical solution of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, below with presently preferred embodiments of the present invention and after coordinating attached drawing to be described in detail such as.
Description of the drawings
Fig. 1 is non-uniform wall thickness tubing cross section profile figure of the present invention；
Fig. 2 is plate thickness distribution map of the present invention；
Fig. 3 is non-uniform wall thickness tubing sectional dimension figure of the present invention；
Fig. 4 is uniform wall thickness bend pipe section size figure of the present invention.
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is described in further detail.Implement below
Example is not limited to the scope of the present invention for illustrating the present invention.
Join shown in Fig. 1 to Fig. 4, present embodiments provides a kind of non-uniform wall thickness tube bending forming method, including：
If the wall thickness of straight pipe uniform wall thickness tubing is δ0, wall thickness is δ on the outside of non-uniform wall thickness tubing to be bentw, and meet
δw>δ0, non-uniform wall thickness tubing inside to be bent wall thickness is δn, and meet δn<δ0；
It is δ to enable the outside wall thickness after bending formingw1, and meet δ surelyw1<δw, inside wall thickness is δn1, and meet δn1>δn；
Enable δ=δw1=δn1, seek δwAnd δn, design wall thickness and pipe on the outside of the tubing as before non-uniform wall thickness bending pipes
Design wall thickness on the inside of material；Wherein, δ is the target wall thickness of uniform wall thickness bend pipe；
According to the δ soughtwAnd δnIt determines the size of non-uniform wall thickness tubing, and carries out bending forming, obtain uniform wall thickness
Bend loss.
The present embodiment realizes the uniform mesh of wall thickness after bending pipes by the non-uniform wall thickness tube bending forming method
's.
Invention is further described in detail below：
This method is initial tubing to be bent to be designed as non-uniform wall thickness, and realize the uniform mesh of wall thickness after bending pipes
's.
Assuming that the original wall thickness of uniform wall thickness tubing is δ0, wall thickness on the outside of non-uniform wall thickness tubing to be bent is designed as δw,
And meet δw>δ0.Wall thickness on the inside of non-uniform wall thickness tubing to be bent is similarly designed as δn, and meet δn<δ0.To non-uniform wall thickness
When tubing carries out bending forming, due to tension on the outside of tubing, outside wall thickness is δ after enabling bending tube formingw1, and meet δ surelyw1<δw.Together
Reason, tubing inside is pressurized, and after bending tube forming, it is δ to enable inside wall thicknessn1, and meet δn1>δn.Referred herein to δw1And δn1For non-homogeneous wall
Outside target wall thickness after thick tube bending forming and inside target wall thickness.Claim δwAnd δnFor design on the outside of non-uniform wall thickness tubing
Wall thickness and inside design wall thickness.When meeting δw1=δn1When, you can realize the purpose of bend pipe uniform wall thickness.Enable δ=δw1=δn1,
In, δ is the target wall thickness of uniform wall thickness bend pipe.
The complicated pipe-line that straight tube and bend pipe combine is known as piping.In entire piping, in order to realize that piping is each
Locate uniform wall thickness, the target wall thickness δ of uniform wall thickness bend pipe can be enabled to be equal to straight pipe tube wall thickness δ0.When the mesh of uniform wall thickness bend pipe
After marking wall thickness δ determinations, initial wall thickness (design wall thickness) δ for calculating non-uniform wall thickness tubing is derived according to target wall thickness δwAnd δn,
It is the core procedure of non-uniform wall thickness tube bending forming method.The cross section profile figure of non-uniform wall thickness tubing is as shown in Figure 1.
Non-uniform wall thickness tubing is welded by the plank curling of non-uniform thickness, wherein parameter δw、δnDirectly determine
The size of non-uniform wall thickness tubing.The final goal of non-uniform wall thickness tube bending forming method is to realize that the wall thickness of bend pipe is equal
Even, that is, it is δ to be equal to target wall thickness.Difficult point is how to be calculated inside and outside non-uniform wall thickness tubing according to the δ derivations of target wall thickness
Side design wall thickness δn、δw.During non-uniform wall thickness tube bending forming, neutral line offset angle and flattening degree can be with
The variation of initial cross-sectional shape and show different rules, meanwhile, these parameters restrict wall thickness again during bending pipes
Variation.Here, doing 2 points of hypothesis to non-uniform wall thickness tube bending forming process：
(1) ignore the influence of section flattening；
(2) non-uniform wall thickness tubing section inside and outside contour is circle.
Non-uniform wall thickness tubing sectional dimension is as shown in Figure 3.
The section inside and outside contour of non-uniform wall thickness tubing is respectively R by two radiuses2And R1Circle constitute, closed according to geometry
System can obtain R1With R2Between relational expression be：
It is R to enable radius1And R2Two round centers of circle are respectively O1And O2, and O1With O2The distance between be db, according to geometry
Relationship has：
db=R1-R2-δn (2)
In figure 3, tubing section is divided into A by neutral axis l1' and A2' two region, center of circle O1Distance to neutral axis l is
x1.With O1For origin, rectangular coordinate system is established.
To formula FN=∫Aσ dA=0 set up to meet the relationship of neutral axis both sides area equation.For the present embodiment
In non-uniform wall thickness tubing for, have A1'=A2', according to A1'=A2' establish equation：
In formula (3), y1And y2Expression formula be respectively：
The tube wall thickness of the present embodiment is heterogeneous, in order to determine the specific location of bend pipe strain neutral layer, need by
The original shape factor in section is taken into account, i.e. center of circle O1To the distance x of neutral axis l1。
It is the radius of curvature of strain neutral layer after non-uniform wall thickness tube bending forming, r to enable R "1' for strain neutral layer extremely
Distance on the outside of bend pipe, r2' for the distance on the inside of strain neutral layer to bend pipe, after forming, uniform wall thickness bend pipe section size figure is such as
Shown in Fig. 4.
It can be obtained according to geometry deformation condition：
In formula (6), R', r1'、r2' expression formula be respectively：
By formula (1), formula (2), formula (3), formula (4), formula (5), formula (6) and formula (7) even cube journey, R, R are substituted into1, δ, α's
Value, can solve equation group can obtain:db, δn, δw, R2Value, so that it is determined that the size of non-uniform wall thickness tubing to be bent.
Principle is shaped it is found that the thickness of sheet metal directly decides the thickness of tubing after processing according to spiral welded pipe
Degree.For the tubing of uniform wall thickness, the plank of uniform wall thickness can be utilized to be crimped welding processing.It is non-equal to realize
The processing and manufacturing of even wall thickness spiral welded pipe, it is necessary to which the plank of uneven thickness one is crimped welding.According to non-uniform wall thickness pipe
The initial designs wall thickness δ in outside in materialw、δnAnd forming angle β, the non-uniform thickness plate thickness regularity of distribution can be calculated, is such as schemed
Shown in 2.
In fig. 2, the thickness change of thickness transitional region is linear change.If a diameter of d of tubing, transition zone after forming
Field width degree W is represented by：
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (3)
1. a kind of non-uniform wall thickness tube bending forming method, which is characterized in that including：
If the wall thickness of straight pipe uniform wall thickness tubing is δ0, wall thickness is δ on the outside of non-uniform wall thickness tubing to be bentw, and meet δw>
δ0, non-uniform wall thickness tubing inside to be bent wall thickness is δn, and meet δn<δ0；
It is δ to enable the outside wall thickness after bending formingw1, and meet δ surelyw1<δw, inside wall thickness is δn1, and meet δn1>δn；
Enable δ=δw1=δn1, seek δwAnd δn, on the outside of the tubing as before non-uniform wall thickness bending pipes in design wall thickness and tubing
Side design wall thickness；Wherein, δ is the target wall thickness of uniform wall thickness bend pipe；
According to the δ soughtwAnd δnIt determines the size of non-uniform wall thickness tubing, and carries out bending forming, obtain the bend pipe of uniform wall thickness
Section.
2. non-uniform wall thickness tube bending forming method according to claim 1, which is characterized in that the method is specifically wrapped
It includes：
If the section inside and outside contour of non-uniform wall thickness tubing is respectively R by two radiuses2And R1Circle constitute, according to geometrical relationship
R can be obtained1With R2Between relational expression be：
It is R to enable radius1And R2Two round centers of circle are respectively O1And O2, and O1With O2The distance between be db, according to geometrical relationship
Have：
db=R1-R2-δn (2)
If A1' and A2' it is two regions for being divided into tubing section by neutral axis l, center of circle O1Distance to neutral axis l is x1, with
O1For origin, rectangular coordinate system is established；
Enable A1'=A2', according to A1'=A2' establish equation：
In formula (3), y1And y2Expression formula be respectively：
It is the radius of curvature of strain neutral layer after non-uniform wall thickness tube bending forming, r to enable R "1' for outside strain neutral layer to bend pipe
The distance of side, r2' for the distance on the inside of strain neutral layer to bend pipe；
It is acquired according to geometry deformation condition：
In formula (6), R', r1'、r2' expression formula be respectively：
By formula (1), formula (2), formula (3), formula (4), formula (5), formula (6) and formula (7) even cube journey, R, R are substituted into1, the value of δ, α, solution
Equation group obtains db, δn, δw, R2Value, and according to db, δn, δw, R2Value determine the size of non-uniform wall thickness tubing to be bent.
3. non-uniform wall thickness tube bending forming method according to claim 1, which is characterized in that the non-uniform wall thickness
Tubing is welded by the curling of non-uniform thickness plank；Wherein, the thickness distribution rule of the non-uniform thickness plank is according to non-
Uniform wall thickness tubing lateral wall δw, non-uniform wall thickness tubing madial wall δnAnd forming angle is calculated and is obtained.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810113222.2A CN108506588A (en) | 2018-02-05 | 2018-02-05 | Non-uniform wall thickness tube bending forming method |
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| CN201810113222.2A CN108506588A (en) | 2018-02-05 | 2018-02-05 | Non-uniform wall thickness tube bending forming method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111659752A (en) * | 2020-06-12 | 2020-09-15 | 江苏新恒基特种装备股份有限公司 | Forming method of equal-wall-thickness bent pipe and eccentric pipe |
| CN111842578A (en) * | 2020-07-23 | 2020-10-30 | 重庆交通大学 | Bent pipe structure forming method capable of ensuring uniform wall thickness |
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| CN111659752A (en) * | 2020-06-12 | 2020-09-15 | 江苏新恒基特种装备股份有限公司 | Forming method of equal-wall-thickness bent pipe and eccentric pipe |
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Application publication date: 20180907 |