CN106903212B - A kind of double-layer composite pipe and preparation method thereof - Google Patents
A kind of double-layer composite pipe and preparation method thereof Download PDFInfo
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- CN106903212B CN106903212B CN201710154181.7A CN201710154181A CN106903212B CN 106903212 B CN106903212 B CN 106903212B CN 201710154181 A CN201710154181 A CN 201710154181A CN 106903212 B CN106903212 B CN 106903212B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
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Abstract
The present invention provides a kind of double-layer composite pipe and its manufacturing process, for solving the problem of in the prior art since the different processing technologys of the magnification of bimetal pipe are complicated, the component that can not form that structure is complicated.The present invention provides a kind of manufacturing process of double-layer composite pipe, comprising the following steps: hollow aluminum-alloy tubes are set to inside hollow carbon steel pipe base by assembly, form two-layer compound pipe；The two-layer compound pipe is placed in and squeezes in space by forming, and the extruding space can match with the two-layer compound pipe, and has the type chamber for forming target shape；The filled media particle in the hollow aluminum-alloy tubes of the two-layer compound pipe；Pressure is applied to the media particle from the axial direction at two-layer compound pipe both ends；The two-layer compound pipe deformation occurs the filling type chamber, forms double-layer composite pipe.Double-layer composite pipe preparation of the invention is simple, performance is good, can be used to make the pipe fitting of labyrinth.
Description
Technical field
The present invention relates to pipe fitting processing technique fields, and in particular, to a kind of double-layer composite pipe and preparation method thereof.
Background technique
Fluid delivery system of the pipeline as media such as common gas, liquid, powder is widely used in aviation boat
It, communications and transportation, automobile, gas, water supply and the every field such as heating system and metallurgy, petroleum, chemical industry, electric power.With
The continuous development of national economy and the raising of living standards of the people, industrial construction and dwelling construction are growing, to conveying
The performance requirement of pipeline is also being continuously improved, and on the basis of guaranteeing rigidity, also to there is good corrosion resistance and resistance to height
Warm nature can wait.
Composite bimetal pipe is made of two different metal pipe materials, between inside and outside two kinds of tubing by various modifications and
Interconnection technique formation is combined closely, and when by external force, inside and outside tubing deforms simultaneously and interface does not separate.Composite bimetal pipe
General design principles are the design stresses that substrate meets components, and inner tube meets corrosion-resistant or wear-resistant equal performance requirements.With list
One metal tube is compared, and composite bimetal pipe combines the physics, chemistry and mechanical characteristic of component metals material, can be made full use of outer
The characteristic of pipe and inner tube not only has required high intensity, but also has the performances such as excellent anticorrosion, wear-resistant, and
And rare and precious metal use has been saved, reduce production cost.Therefore, composite bimetal pipe can be widely applied to stone
The conveying in the fields such as oil, chemical industry, nuclear industry, medical treatment, food, building, fire-fighting pipe, heat exchanger pipe and instrument pipe etc..
Inner tube mainly realizes that anti-corrosion function, outer tube improve stiffness and strength in composite bimetal pipe, closes compared to simple aluminium
Golden tubing members cost reduces, stiffness and strength improves；Antiseptic property is improved compared to simple steel pipe, specific stiffness is improved and realized light
Quantization.
If inner tube selects high-strength aluminum alloy to squeeze tubing, high strength alumin ium alloy extruding tubing forming property is poor, 5 systems, 6 systems
It is no more than 10% with the aluminum alloy extruded tube elongation percentage maximum of 7 systems, some is even lower than 5%, even if using annealing or admittedly
Molten its elongation percentage of processing improves general also no more than 20%.Therefore, forming tubular product complicated shape pipe is squeezed using high strength alumin ium alloy
Shape component is almost irrealizable.Meanwhile high strength alumin ium alloy tubular element generally has the use feature of anti-corrosion or loss of weight, also
There is high requirement to intensity, rigidity, surface hardness and the mechanical performances such as antifatigue.
Existing bimetal pipe processing uses hydraulic buckling method, and end sealing generally uses machinery in hydraulic bulging process
Sealing is compressed, i.e. the both ends of bimetal pipe are compacted deformation and realize sealing, and such sealing means make ectonexine metal pipe billet
In bulging, the material at both ends cannot flow the effect to form feed supplement to shaped region, therefore, using such mode hydroforming
Pipe fitting forming area be thinned serious, or even generate rupture.
Therefore, there is an urgent need to a kind of manufacture craft processing double-layer metal tubes, make full use of advantage, the simplification of inner and outer tubes
Processing technology.
Summary of the invention
Technical solution used by solving the above problems is a kind of double-layer composite pipe and preparation method thereof.
A kind of manufacturing process of double-layer composite pipe provided by the invention, which comprises the following steps:
Assembly: hollow aluminum-alloy tubes are set to inside hollow carbon steel pipe base, form two-layer compound pipe；
Forming: the two-layer compound pipe is placed in and is squeezed in space, the extruding space can be with the two-layer compound
Pipe matches, and has the type chamber for forming target shape；
The filled media particle in the hollow aluminum-alloy tubes of the two-layer compound pipe；
Pressure is applied to the media particle from the axial direction at two-layer compound pipe both ends；
The two-layer compound pipe deformation occurs the filling type chamber, forms double-layer composite pipe.
Preferably, the hollow carbon steel pipe base is obtained by coiling welded.
Preferably, the type chamber is bulge loop, tetrahedron or hexahedron.
Preferably, the material of the hollow carbon steel pipe base is selected from Q235 or 304 stainless steel plates.
Preferably, the material of the hollow aluminum-alloy tubes is selected from AA6061 or AA5052.
Preferably, the extruding space is made of the enclosure space that pipe fitting mold and medium pressure head surround；
Wherein, pipe fitting mold at least two, and driving is carried out by driving mechanism and is performed relative motion；
The medium pressure head includes the first pressure head and the second pressure head, for applying pressure to the media particle.
Preferably, further include the steps that being heat-treated the hollow aluminium-alloy pipe before installation step；
The heat treatment method includes: annealing or solution treatment.
Preferably, further include the steps that carrying out ageing treatment to the double-layer composite pipe after forming step.
The object of the invention is also to provide a kind of double-layer composite pipe, the double-layer composite pipe is multiple using above-mentioned bilayer
Close the manufacturing process preparation of pipe.
The present invention has following advantages:
1) due to 5 systems, 6 systems and 7 systems (so-called 5 system, 6 systems, 7 systems refer to after aluminum alloy extruded tube label AA respectively with
5,6,7 beginning) etc. high-strength aluminum alloy materials extensibility it is poor, especially extruding tubing；Welding performance is also poor simultaneously, it is difficult to
The coiling welded pipe of plate is prepared, these are all that limitation high strength alumin ium alloy tubing is difficult to the main reason for being widely applied in actual production.
If being cladded with thin-walled carbon is in control composite pipe blank, internal pressure and carbon steel pipe of the liner high strength alumin ium alloy pipe in media particle
Under the double action of outer cladding, its forming property can be effectively improved.The mechanism that forming property improves is, thick big to pressure
Width improves so that forming limit improves；Enhance the rubbing action between two pipes simultaneously, so that the deformation of liner pipe is inhibited to be thinned, this
Different from the stress-strain state of general bulging deformation process.
(2) two-layer compound pipe prepare it is simple.Internal lining pipe, which can be selected, squeezes high strength alumin ium alloy tubing, hollow carbon steel pipe base
According to squeezing, tube outer diameter is coiling welded to be obtained.Since circularity and dimensional tolerance of the media particle bulging process to two-layer compound pipe are wanted
Ask lower, especially low to liner and the requirement of hollow carbon steel pipe base fit dimension, this prepares the pipe of the technique very just
It is prompt and cheap；
(3) high strength alumin ium alloy tubular element generally has anti-corrosion, loss of weight and energy-absorbing etc. using feature, at the same to intensity, just
Degree, surface hardness and the mechanical performances such as antifatigue have high requirement, according to hollow carbon steel pipe base and liner high strength alumin ium alloy
Extruded tube combines, and material by adjusting bimetallic material and thickness can greatly adapt to use demand, real
Existing optimal material use efficiency, can further expand the application field of tubular element.
(4) the type composite pipe is prepared using media particle bulging process, forming technology wants mold and loading equipemtn
It asks lower, processing step can be realized on universal press, without increasing external device (ED), technique realizes simplicity, more without increasing
Investment.
Detailed description of the invention
Fig. 1 is double-layer composite pipe assembly flow charts in the embodiment of the present invention 1.
Fig. 2 is the die sinking cross-sectional view of double-layer composite pipe shaping dies in the embodiment of the present invention 1.
Fig. 3 is the molding cross-sectional view of double-layer composite pipe shaping dies in the embodiment of the present invention 1.
Fig. 4 is the extrusion molding cross-sectional view of double-layer composite pipe shaping dies in the embodiment of the present invention 1.
Fig. 5 is the double-layer composite pipe photo prepared in the embodiment of the present invention 2.
Fig. 6 is the double-layer composite pipe photo prepared in the embodiment of the present invention 3.
Appended drawing reference: 1. hollow carbon steel pipe bases；2. hollow aluminum-alloy tubes；3. two-layer compound pipe；4. weld bond；5. medium
Particle；6. medium pressure head；61. the first pressure head；62. the second pressure head；7. pipe fitting mold；71. the first pipe fitting mold；72. the second pipe
Part mold；8. mould bases；9. die cylinder；10. squeezing space；11. guide rod；12. leader nut；13. type chamber；14. two-layer compound
Pipe.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, with reference to the accompanying drawing and specific embodiment party
Present invention is further described in detail for formula.
Embodiment 1
As shown in Figs 1-4, the present embodiment provides a kind of manufacturing process of double-layer composite pipe, comprising the following steps:
Assembly: hollow aluminum-alloy tubes 2 are set to inside hollow carbon steel pipe base 1, form two-layer compound pipe 3；
Specifically, as shown in Figure 1, the weld bond 4 of hollow carbon steel pipe base 1 needs cleaning to tie, internal diameter is according to hollow aluminium alloy
The outer diameter basic size of pipe 2 welds hollow carbon using B11 grades of standard shaft clearance fit designs, and using the control of same accuracy grade
The cylindricity of steel pipe base 1.Then, the hollow carbon steel pipe base 1 of two unlike materials and hollow aluminum-alloy tubes 2 are assembled,
Obtain two-layer compound pipe 3.
Preferably, the hollow carbon steel pipe base 1 is obtained by coiling welded.
Forming: the two-layer compound pipe 3 is placed in and is squeezed in space 10, the extruding space 10 can be with the bilayer
Composite pipe blank 3 matches, and has the type chamber 13 for forming target shape；
The filled media particle 5 in the hollow aluminum-alloy tubes 2 of the two-layer compound pipe 3；
Pressure is applied to the media particle 5 from the axial direction at 3 both ends of two-layer compound pipe；
The two-layer compound pipe 3 deformation occurs the filling type chamber 13, forms double-layer composite pipe 14.
Specifically, as shown in Fig. 2, die device is in the open state, medium pressure head 6 includes the first pressure head 61 and the second pressure
First 62, wherein upper limit position is on the first pressure head 61, second medium pressure head 62 is in lower position, passes through hydraulic device
It directly drives；
Pipe fitting mold 7 includes the first pipe fitting mold 71 and the second pipe fitting mold 72, is in die opening state, passes through two sides respectively
Die cylinder 9 directly drive, and be mounted on guide rod 11 and realize slide-and-guide, guide rod 11 is fixed on mould by leader nut 12
On frame 8.Above-mentioned first medium pressure head 61, second medium pressure head 62, the first pipe fitting mold 71 and the second pipe fitting mold 72 is being opened
Mould state can guarantee that two-layer compound pipe 3 is smoothly packed into.
As shown in figure 3, being packed into two-layer compound pipe 3, second medium pressure head 62, the first pipe fitting mold 71, the second pipe fitting mould
Tool 72 moves to die-closed position respectively, after being then charged into media particle 5；First medium pressure head 61 also moves into die-closed position.
Above-mentioned first medium pressure head 61, second medium pressure head 62, the first pipe fitting mold 71 and the second pipe fitting mold 72 exists
It is formed after molding and squeezes space 10, the extruding space 10 can be matched with two-layer compound pipe 3, and had and formed
The type chamber 13 of target shape.
The type chamber 13 is bulge loop, tetrahedron or hexahedron.It is understood that the shape of type chamber 13 can be according to tool
Body needs to design.
As shown in figure 4, the first pipe fitting mold 71 and the second pipe fitting mold 72 respectively die cylinder 90 pressure keep under
Ensuring molding state, first medium pressure head 61, second medium pressure head 62 are loaded under the driving of hydraulic device simultaneously at this time,
Media particle 5 forces two-layer compound pipe 3 to deform mold after carrying, obtain double-layer composite pipe 14.First medium pressure head after forming
61, second medium pressure head 62 is moved to initial position first, and then the first pipe fitting mold 71 and the second pipe fitting mold 72 are moved to
Initial position takes out double-layer composite pipe 14, completes forming process.
Cladding pressure when the above method is using hollow carbon steel pipe base and hollow aluminum-alloy tubes Coupling Deformation acts on, and
Effect is frictionally held between two pipes, greatly improves the forming property of aluminium alloy pipe, conventional method can be shaped and obtained
Less than complicated tubular element.
Also, by adjusting the material and thickness of hollow carbon steel pipe base and hollow aluminum-alloy tubes, give full play to aluminium alloy
The advantage that specific strength is high, corrosion resistance is strong plays the advantage that steel hardness is high, intensity is high, welding performance is excellent, is adapted to not
With the stiffness and strength requirement of use condition, the light-weighted target of component can be realized.
Simultaneously as the welding performance of hollow aluminum-alloy tubes is poor, it can be selected and squeeze tubing；And the welding performance of steel plate
Preferably, hollow carbon steel pipe base can be welded according to aluminium alloy extruded pipe outside diameter size, hollow carbon steel pipe base and hollow aluminium alloy
Pipe is certainly existing certain gap between two pipes in assembly, but make two pipes by media particle hydroforming
Coupled in common is deformed and is fitted closely, and ensure that the globality of composite pipe.
Media particle bulging process compares other internal high pressure forming techniques, and composite pipe blank both ends, which do not need to compress to seal, carrys out shape
At high pressure in bulging, therefore in media particle Bulging Process, two-layer compound pipe both ends can be with free shrink, this is to improve
Shape the key point of pipe fitting evenness of wall thickness.Simultaneously as the difference in material properties of two kinds of materials of two-layer compound pipe, at
The shrinkage of inside and outside pipe certainly exists difference in shape, and free pipe end boundary condition is more conducive to the forming of composite pipe.
Media particle hydroforming is carried out using two-layer compound pipe, there are following advantages:
1. media particle is coated on hollow aluminum-alloy tubes inner surface always in media particle internal pressure Bulging Process, compel
Make inside and outside bimetallic pipe billet coupled in common deformation, hollow carbon steel pipe base deformation reacts on the surface normal of hollow aluminum-alloy tubes
Pressure can be such that the forming property of the hollow aluminum-alloy tubes of internal layer significantly improves；Meanwhile the raising of tube wall normal pressure, enhance two pipes
Rubbing action between wall contact, the friction are able to suppress being thinned in hollow aluminum-alloy tubes forming, i.e., so-called friction is protected
The enhancing of holding effect fruit, and one of an important factor for raising forming limit；
2. selecting the material of inside and outside metal according to product demand, the thickness ratio of ectonexine metal can be more designed to adjust and produce
The stiffness and strength demand of product realizes optimal material use efficiency.Since media particle bulging process is passed using solid particle
The pipe high internal pressure environment of pressure, formation process demand is not necessarily to special sealing device, therefore wants to pipe fitting circularity, dimensional tolerance etc.
Ask very low, this process advantage makes the preparation of two-layer compound pipe that hollow carbon steel pipe base and the progress of hollow aluminum-alloy tubes can be used
Wide arc gap assembly, reduces the condition of double-layer composite pipe preparation, to reduce manufacturing cost.
Two pipe stress conditions in specific forming process are analyzed below:
Assuming that: the hollow inside and outside radius of aluminum-alloy tubes is respectively a and b；The inside and outside radius of outer tube is respectively c and d；Thickness of pipe wall
Degree is t.Compound preceding c > b, i.e., there are gaps between hollow aluminum-alloy tubes and hollow carbon steel pipe base.It is managed according to plastoelasticity
By in bulging recombination process, hollow aluminum-alloy tubes gradually expand, and are gradually combined with hollow carbon steel pipe base.It is answered in plane
Under the conditions of power, using ideal elastic-plastic as material model, hollow aluminum-alloy tubes occur plastic deformation and with hollow carbon steel pipe base
When just contacting, but not yet generating contact pressure, the internal pressure that hollow aluminum-alloy tubes are subject to, hollow aluminum-alloy tubes are further swollen
After swollen, contact pressure will be generated between hollow carbon steel pipe base.When contact pressure reaches a certain limiting value, hollow carbon steel pipe
Base surface is just surrendered, while the internal pressure that hollow aluminum-alloy tubes are subject to also reaches its limiting value.During loading, hollow aluminum
After alloy pipe stock is in contact with hollow carbon steel pipe base and generates contact pressure, hollow carbon steel pipe base only by uniform internal pressure, (press by contact
Power) effect, thus can calculate the force-bearing situation of any position and radial displacement and hollow carbon steel pipe base inner wall in outlet pipe
Displacement.In unloading phase, hollow aluminum-alloy tubes are no longer influenced by the effect of pressure, and plasticity unloading can naturally occur and receive
Contracting, i.e., the outer marginal circumference of hollow aluminum-alloy tubes can generate radial displacement.Displacement at hollow carbon steel pipe base inner wall with it is hollow
The difference of natural shrinking amount when aluminum-alloy tubes unload is exactly hollow aluminum-alloy tubes and hollow carbon steel pipe base in " common " unloading
Magnitude of interference in the process, when displacement at outer tube wall is not less than hollow aluminum-alloy tubes natural shrinking amount, when unloading, is connect
There are residual pressures at contacting surface.
Embodiment 2
The present embodiment uses method as described in example 1 above, and hollow carbon steel pipe base 1 uses Q235 plate welded still pipe,
Hollow aluminum-alloy tubes 2 squeeze tubing using AA5052, through the above steps, shape bulge loop pipe fitting, are specifically shown in Fig. 5.
In addition, can also specifically be made annealing treatment, mesh to the heat treatment that it is carried out before AA5052 tubing is formed
Be improve elongation percentage, the reinforcing of AA5052 can be bigger by strain hardening, that is, the degree of bulging, and strengthening effect can be more
It is good.The main function of AA5052 is anti-corrosion, energy-absorbing and loss of weight in the present embodiment, and the stiffness and strength of component mainly pass through Q235
Plate welded still pipe is realized.
Embodiment 3
The present embodiment uses method as described in example 1 above, and hollow carbon steel pipe base 1 is managed using 304 stainless steel plates are coiling welded,
Hollow aluminum-alloy tubes 2 squeeze tubing using AA6061, through the above steps, shape hexahedron pipe fitting, are specifically shown in Fig. 6.
In addition, heat treatment reinforcement material can be carried out before AA6061 tubing is formed, it should be appreciated that for
The heat treatment for squeezing tubing for 6 systems, 7 line aluminium alloys selects solution treatment.
It is welded pipe assembly and bulging with 304 stainless steel plates into target shape at once after solution treatment, then carries out artificial
Timeliness restores aluminium alloy pipe intensity.The artificial aging condition of AA6061 pipe fitting will not bring the material property of 304 stainless steels
It influences, this is also the major reason that they can be used in combination, because inevitable after forming enter artificial aging link jointly.It manages in this way
The stiffness and strength effect of material component is just by the two shared, while liner aluminum alloy materials still have anticorrosive, suction
It can be with the important function of loss of weight.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (7)
1. a kind of manufacturing process of double-layer composite pipe, which comprises the following steps:
Assembly: hollow aluminum-alloy tubes are set to inside hollow carbon steel pipe base, form two-layer compound pipe；
Forming: the two-layer compound pipe is placed in and is squeezed in space, the extruding space can be with the two-layer compound pipe
Match, and there is the type chamber for forming target shape, the type chamber is bulge loop, tetrahedron or hexahedron；The extruding is empty
Between be made of the enclosure space that pipe fitting mold and medium pressure head surround；
The filled media particle in the hollow aluminum-alloy tubes of the two-layer compound pipe；
Pressure, the media particle bulging mistake are applied to the media particle from the axial direction at two-layer compound pipe both ends
The both ends of two-layer compound pipe described in journey can be with free extension；
The two-layer compound pipe deformation occurs the filling type chamber, forms double-layer composite pipe；
Further include the steps that being heat-treated the hollow aluminum-alloy tubes before installation step；
The heat treatment method includes: annealing or solution treatment.
2. the manufacturing process of double-layer composite pipe as described in claim 1, which is characterized in that the hollow carbon steel pipe base is logical
Cross coiling welded obtain.
3. the manufacturing process of double-layer composite pipe as described in claim 1, which is characterized in that the material of the hollow carbon steel pipe base
Material is selected from Q235 or 304 stainless steel plates.
4. the manufacturing process of double-layer composite pipe as described in claim 1, which is characterized in that the hollow aluminum-alloy tubes
Material is selected from AA6061 or AA5052.
5. the manufacturing process of double-layer composite pipe as described in claim 1, which is characterized in that pipe fitting mold at least two, and
Driving is carried out by driving mechanism to perform relative motion；
The medium pressure head includes the first pressure head and the second pressure head, for applying pressure to the media particle.
6. the manufacturing process of double-layer composite pipe as described in claim 1, which is characterized in that after forming step further include pair
The two-layer compound pipe carries out the step of ageing treatment.
7. a kind of double-layer composite pipe, which is characterized in that the double-layer composite pipe is using double as described in claim 1-6 is any
The manufacturing process preparation of layer multiple tube.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110976671A (en) * | 2019-12-12 | 2020-04-10 | 太原理工大学 | Solid particle medium forming method and device for aluminum-clad magnesium composite pipe fitting |
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| CN110001079A (en) * | 2019-04-28 | 2019-07-12 | 燕山大学 | A kind of carbon fibre pipe fitting preparation facilities and method |
| CN110001077A (en) * | 2019-04-28 | 2019-07-12 | 燕山大学 | A kind of carbon fibre pipe fitting preparation facilities and method |
| CN110479823A (en) * | 2019-08-09 | 2019-11-22 | 武汉源锦建材科技有限公司 | A kind of reinforcing bar connection shears the molding machine and forming method of slot with grout sleeve |
| CN110814123B (en) * | 2019-11-14 | 2022-03-25 | 哈尔滨工业大学 | Rapid thermal forming device and method for corrugated pipe |
| CN114700388B (en) * | 2022-04-28 | 2023-09-08 | 太原理工大学 | Forming method for thin-wall multi-way composite pipe fitting |
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