CN104246417A - Heat exchange tube attached with aluminum alloy inner groove - Google Patents

Heat exchange tube attached with aluminum alloy inner groove Download PDF

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Publication number
CN104246417A
CN104246417A CN201380019372.2A CN201380019372A CN104246417A CN 104246417 A CN104246417 A CN 104246417A CN 201380019372 A CN201380019372 A CN 201380019372A CN 104246417 A CN104246417 A CN 104246417A
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CN
China
Prior art keywords
heat pipe
inner face
aluminum alloy
fluted
mentioned
Prior art date
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Granted
Application number
CN201380019372.2A
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Chinese (zh)
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CN104246417B (en
Inventor
大谷良行
若栗聪史
原康人
石田纮一
儿岛洋一
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Furukawa Sky Aluminum Corp
UACJ Corp
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UACJ Corp
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/20—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls
    • B21C37/207—Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies ; Making tubes with angled walls, ribbed tubes and tubes with decorated walls with helical guides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C23C4/08—Metallic material containing only metal elements
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F28F1/24—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely
    • F28F1/32—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending transversely the means having portions engaging further tubular elements
    • F28F1/325—Fins with openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/40—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only inside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/10—Fastening; Joining by force joining

Abstract

Disclosed is a heat exchange tube that has excellent hairpin bending workability, generates little fin crushing, and has excellent corrosion resistance. Provided is the heat exchange tube attached with an aluminum alloy inner groove that has a plurality of ridge-type fins formed therein, contains 0.8 to 1.8 percentage by mass of Mn (hereinafter, percentage by mass is referred to as %), 0.3% to 0.8% of Cu, and 0.02% to 0.2% of Si. The remnant is formed from Al and unavoidable impurities, and the average grain size of the molded article is 150mum or less.

Description

The fluted aluminum alloy heat pipe of inner face band
Technical field
The present invention relates to: at domestic air conditioning, business air-conditioning, in heat-pump type hot-water boiler etc., the fluted aluminum alloy heat pipe of inner face band that the heat pipe as cross-fin (Cross fin) type heat exchanger uses.
Background technology
General cross-fin type (another name ＂ fin-and-tube type (Fin-and-tube type) ＂) heat exchanger (Fig. 1), heat pipe is inserted in the patchhole of aluminium radiator fin split shed, then, there is in the press-in of heat pipe inside the expander mandrel (mandrel) of the external diameter being greater than its internal diameter, by the expanded in diameter of heat pipe, make the patchhole of heat pipe outer peripheral face and aluminium radiator fin closely sealed (expander is processed, Fig. 2).Afterwards, hair clip (Hairpin) shape will be bent to aluminium radiator fin shape all-in-one-piece heat pipe, again the heat pipe (U-shaped pipe) bending to U-shaped is in addition coupled together with gas brazing, obtained product (non-patent literature 1).
With regard to the heat pipe for cross-fin type heat exchanger, because make the flowings such as cold-producing medium HFC in pipe, carry out heat exchange, at the inner face of pipe, to have cross sectional shape be trapezoidal or the heat pipe (hereinafter referred to as " the fluted heat pipe of inner face band ") of the ridged fin such as triangle is used, and therefore the high efficiency of heat exchanger and energy-saving are developed.Someone discloses the fluted heat pipe of inner face band, there is the fin of various shape, and with regard to these shapes, define: the degree of depth of the ditch between protrusion-type fin as shown in Figure 4, the thickness (wall thickness of protrusion-type fin basal part) of bottom, the shape (drift angle etc.) of fin, or lead angle (the Lead angle of protrusion-type fin as shown in Figure 5, namely relative to pipe range direction, the angle of fin array).(such as, patent document 1).The reason that the heat conductivility of the fluted heat pipe of inner face band is outstanding is: the surface area ratio of pipe inner face does not have the large of gelled smooth tubes, and in pipe, finds out homogeneous cold-producing medium liquid film (non-patent literature 2) by this ditch.
At the inner face of the fluted heat pipe pipe of inner face band, generally, by rotary rolling mill pipe (namely crude pipe, refers to smooth tubes herein), form the fin that continuous arrangement is spiral helicine protrusion-type.With regard to rotary rolling mill method, known: the plug inserting the with groove rotated freely in pipe, be squeezed in the outer roller rotated freely of pipe, while making its planetary rotation, rolling (roll rolling) autofrettage (as shown in Figure 3) of pull-out pipe, or without rolling, and the ball roll forming manufacturing process of extrusion ball (ball) (non-patent literature 1, patent document 2).
On the fluted heat pipe of inner face band, main copper product such as use copper or copper alloy etc. at present, but reduce fee of material and light-weighted requirement to reach, someone considers to use the aluminums (hereinafter referred to as aluminium alloy) such as aluminum or aluminum alloy.
; aluminium alloy is compared with copper product; corrosion resisting property is poor; disclose in patent document 3 and 4: the fluted heat pipe of a kind of inner face band; wherein; heat pipe is 2 layers of structure, uses Al-Mn alloy, the sacrifice corrosion-resistant coating of coated on extexine (clad) Al-Zn alloy in pipe la m.
On the other hand, except corrosion proof problem, when expander processes these inner face bands fluted aluminum alloy heat pipe, the crown portion of the protrusion-type fin of pipe inner face is damaged, namely so-called " fin is damaged " occurs, or because of expander insufficient, insufficient with the bonding of aluminium radiator fin, and cause can not get the problem of the thermal conductivity expected.The reason that these problems occur is: the strength of materials of aluminium or the fluted aluminum alloy heat pipe of inner face band is lower than copper.
In addition, also occur that a problem is: when carrying out hair fastener bending machining for the fluted heat pipe of above-mentioned aluminum inner face band, bend ruptures.
In addition, have studied in patent document 5: in JIS3003, add Zn alloy as skin material, to improve tube expanding workability.
[background technology document]
[patent document]
[patent document 1] Japanese Patent Laid-Open 2003-287383 publication
The special flat 4-262818 publication of [patent document 2] Japan Patent
[patent document 3] Japanese Patent Laid-Open 2000-121270 publication
[patent document 4] Japanese Patent Laid-Open 2009-250562 publication
[patent document 5] Japanese Patent Laid-Open 2008-267714 publication
[non-patent literature]
[non-patent literature 1] her rattan is just clear: heat conduction, 42,174 (2003), 3
The rugged clear hero of [non-patent literature 2] rock and other: R & D Kobe Steel skill report 50,3 (2000), 66
Summary of the invention
[inventing the problem that will solve]
But the prior art that above-mentioned document is recorded, also has room for improvement in following some.
In patent document 1, patent document 2 and non-patent literature 1,2, the problem of breaking during hair fastener bending machining and the problem of fin breakage are not resolved.In patent document 3, describing object is improve the corrosion resistance of aluminium alloy heat pipe, but during hair fastener bending machining break and the problem of fin breakage is not resolved.The feature of patent document 4 is: in order to improve corrosion resistance, in outer surface cladding ratio core current potential low skin material, but not record about the problem of the problem of breaking during hair fastener bending machining and fin breakage.
Further, in order to improve corrosion resistance, by Al-Zn alloy-coated when the heat pipe, because soft surface, when manufacturing the pipe before rotary rolling mill, surface produces small scar.Adopt those pipes to carry out rotary rolling mill, this small scar is increase the crack (crack) for hundreds of microns.The problem caused is: these slight cracks are by the starting point produced of breaking when becoming hair fastener bending machining.
In addition, in patent document 5 method, splintering problem during hair fastener bending machining does not improve.In addition, because with the addition of Cu in skin material, Fe, the corrosion resistance of skin material is poor, may cause: can not obtain the sacrifice anticorrosion ability expected.In addition, because employ core, and this core is made up of the alloy being equivalent to JIS3003, and the problem of fin breakage is not resolved.
The present invention in view of the foregoing, its objective is: provide a kind of inner face band outstanding at hair fastener bendability fluted aluminum alloy heat pipe.In addition, the object of the invention is: the fluted aluminum alloy heat pipe of the inner face band providing a kind of corrosion resistance outstanding.In addition, the object of the invention is: provide a kind of inner face band fluted aluminum alloy heat pipe, wherein, be difficult to the breakage producing fin.
[in order to solve the means of problem]
The present inventor, the various researchs that inner face band fluted aluminum alloy heat pipe is relevant are carried out, found that and a kind of material can be provided, the feature of this material is: the composition of core alloy contains specific contamination, thus make hair fastener bendability outstanding, and fin breakage is difficult to occur.
Further, a kind of material is provided, is characterized in: the Zn distributions limit of corrosion-resistant coating will be sacrificed in particular range, thus make hair fastener bendability outstanding, and the damaged difficult generation of fin, corrosion resistance is outstanding.
The 1st described in claim 1 invention is the fluted aluminum alloy heat pipe of a kind of inner face band, it is characterized in that: on inner face, form more than the 2 (scopes of " more than A ", also A itself is comprised) heat pipe of ridged fin is aluminum alloy heat pipe, it consists of containing Mn: 0.8 ~ 1.8 quality % (hereinafter only with % to represent quality %), Cu: 0.3 ~ 0.8%, Si: 0.02 ~ 0.2%, remainder is inevitable impurity and Al; Further, the average crystallite particle diameter in above-mentioned heat pipe cross section is less than 150 μm.
Described in claim 2 the 2nd invention is the fluted aluminum alloy heat pipe of a kind of inner face band, it is characterized in that: on the surface of the heat pipe described in claim 1, surface Zn concentration is more than 0.5%, and average surface Zn concentration is 1 ~ 12%, and the concentration of arbitrary surfaces average surface Zn concentration ± 50% within, and have Zn diffusion layer, wherein, the Zn diffusion depth (hereinafter referred to as " Zn thickness of diffusion layer ") from surface is 100 ~ 300 μm.
Described in claim 3 the 3rd invention is the fluted aluminum alloy heat pipe of a kind of inner face band, it is characterized in that: the heat pipe described in claim 2 is aluminum alloy heat pipe, it consists of containing Mn: 0.8 ~ 1.8%, Cu: 0.3 ~ 0.8%, Si: 0.02 ~ 0.2%, remainder is inevitable impurity and Al; And with aluminum alloy heat pipe for core, the feature of above-mentioned aluminum alloy heat pipe is, the cross section average crystallite particle diameter of above-mentioned heat pipe is less than 150 μm; On its outer surface, coated Al-Zn alloy is as skin material; Further, Zn diffusion heat treatments is carried out.
Described in claim 4 the 4th invention is the fluted aluminum alloy heat pipe of a kind of inner face band, it is characterized in that: in heat pipe described in claim 3, the above-mentioned core after above-mentioned Zn diffusion heat treatments and the difference of hardness of above-mentioned skin material are below 15Hv.
Described in claim 5 the 5th invention is the fluted aluminum alloy heat pipe of a kind of inner face band, it is characterized in that: in the heat pipe described in claim 3 or claim 4, above-mentioned skin material contains Zn: 1.0 ~ 7.0%, and Mn: 0.3 ~ 1.5%, remainder is inevitable impurity and Al.
Described in claim 6 the 6th invention is the fluted aluminum alloy heat pipe of a kind of inner face band, it is characterized in that: heat pipe is aluminum alloy heat pipe as stated in claim 2, it consists of containing Mn: 0.8 ~ 1.8%, Cu: 0.3 ~ 0.8%, and Si: 0.02 ~ 0.2%, remainder is inevitable impurity and Al; And the feature of aluminum alloy heat pipe is, the cross section average crystallite particle diameter of above-mentioned heat pipe is less than 150 μm; Spraying plating Zn on the outer surface of above-mentioned aluminum alloy heat pipe, and carry out Zn diffusion heat treatments.
Described in claim 7 the 7th invention is the fluted aluminum alloy heat pipe of a kind of inner face band, it is characterized in that: in heat pipe described in claim 6, and relative to by the outer surface of the heat pipe of spraying plating Zn, coverage rate is more than 90%.
Described in claim 8 the 8th invention is, the manufacture method of the fluted aluminum alloy heat pipe of the inner face band as described in claim 6 and claim 7, it is characterized in that: when carrying out spraying plating on above-mentioned heat pipe, the geometry center in above-mentioned heat pipe cross section is connected with the center of more than 2 (comprising 2) Zn spray torches, line adjacent is respectively with above-mentioned geometry center angulation, and this angle is less than 120 °.
[effect of invention]
The fluted aluminum alloy heat pipe of inner face band of the present invention, the effect had is: can suppress the generation of breaking when hair fastener bending machining.The effect also had in addition is: have good corrosion resistance, is difficult to that fin occurs damaged.
Accompanying drawing explanation
[drawing simply illustrates]
Fig. 1 is an example of the expanded view of a part for cross-fin type heat exchanger.
An example of what Fig. 2 represented is mandrel method of expanding.
An example of what Fig. 3 represented is rolling device.
Fig. 4 is the schematic diagram of, expression be the example in the cross section of the fluted heat pipe of inner face band.
Fig. 5 is the schematic diagram of, expression be the lead angle of inner face ridged fin.
Detailed description of the invention
[preferred forms of invention]
Below with regard to embodiments of the present invention, be described in detail.
The heat pipe imagined in the present embodiment is, such as, the heat pipe on the heat exchanger for air conditioner of average family, its size is, such as, external diameter φ 4.0 ~ φ 9.54mm, the small-caliber thin-walled tube of thick about the 0.3 ~ 0.6mm of bottom.Therefore, in various aluminium alloy, there is suitable intensity and to have good processability with regard to small-caliber thin-walled tube (extrudability with regard to manufacturing, draftability, rolling) alloy (such as, the A3003 alloy (Al-1.0 ~ 1.5%Mn-0.05 ~ 0.20%Cu alloy) of Al-Mn) based on (base), by adjustment Addition ofelements, granular and the intensity of crystal grain are improved, thus a kind of aluminium alloy can be obtained, the feature of this aluminium alloy is breaking and the breakage of fin when preventing hair fastener bending machining.
The composition of heat pipe
Next, the composition for heat pipe in present embodiment carries out the reason limited, and is described.
Mn is the main adding elements improving intensity in 3000 alloys, and it is solid solution in aluminium, and a part is separated out, and has the effect of giving intensity, and when its addition is less than 0.8%, the intensity of heat pipe is not enough.On the other hand, addition more than 1.8% time, the effect that intensity improves reaches full, and the quantitative change of thick intermetallic compound is many, the problem such as easily to break in the manufacturing process of pipe.Therefore, Mn addition is the scope of 0.8 ~ 1.8%.The scope be more preferably is 1.0 ~ 1.5%.
Cu is solid solution in aluminium, has the effect improving intensity further, and does not hinder processability.Further, Cu improves Pitting Potential, and the Pitting Potential difference of Zn diffusion layer and the pipe central portion that do not spread Zn is large, can improve sacrifice corrosion-resisting function.When its addition is fewer than 0.3%, intensity is not enough, and the groove that can not prevent the expander due to machinery from causing is damaged, and the degree improving Pitting Potential is not enough, and sacrifice corrosion-resisting function is low.More than 0.8%, extrudability, draftability, corrosion resistance is poor.Therefore, Cu addition is the scope of 0.3 ~ 0.8%.The scope be more preferably is 0.4 ~ 0.6%.
Si, in Al-Mn-Cu alloy, forms Al-Mn-Si or Al-Mn-Si-Cu intermetallic compound, has the effect improving intensity.On the other hand, these intermetallic compound hinders recrystallization when hot extrusion, and when its addition is more than 0.2%, average crystallite particle diameter is more than 150 μm, becomes rough surface during hair fastener bending machining, the reason of fracture.On the other hand, the existence of Si in aluminium alloy is inevitable, and consider from practical standpoint, it is difficult for being restricted to less than 0.02%.Therefore, the addition of Si is 0.02 ~ 0.2%.The scope be more preferably is 0.02 ~ 0.1%.
Fe, Mg, Zn etc. are impurity, and when Fe be less than 0.6%, Mg be less than 0.2%, Zn is less than 0.3%, they do not hinder effect of the present invention.
In addition, Ti, Cr, Zr, because have effect ingot bar being organized homogeneous granular, can contain, but more than 0.2%, form huge intermetallic compound or extrudability decline, so its content is preferably less than 0.2%.If in this scope, do not hinder the effect of heat pipe in present embodiment.Its content in addition also can be 0 ~ 0.1%, can also be 0 ~ 0.05%.
In addition, for the various component amount in heat pipe in present embodiment or sacrifice corrosion-resistant coating, can be Examples below S1 ~ S11, the valency described in K1 ~ K8, can in the scope of these numerical value.
About coated sacrifice corrosion-resistant coating
Next, the reason that the Zn distribution about the sacrifice corrosion-resistant coating to cage walls in present embodiment limits, is described.
In embodiment of the present invention in aluminium alloy cage walls, after, stretch process coated as skin material using Al-Zn alloy, by carrying out Zn diffusion heat treatments, form the layer of Zn diffusion.With regard to above-mentioned Zn diffusion layer, Pitting Potential is low compared with not spreading the part of Zn in tubing, so make tubing anticorrosion by sacrificing corrosion-resisting function, extends the endurance life of tubing.
With regard to aluminium alloy cage walls in embodiment of the present invention, in order to make the surperficial Zn concentration after Zn diffusion heat treatments be 0.5 ~ 12%, the condition of adjustment diffusion heat treatments.Being meant to of surface Zn concentration: during with the arbitrfary point of the analytical equipment measured surface such as EPMA (X-ray microanalysis instrument), Zn concentration.Surface Zn concentration ratio 0.5% is low, and sacrifice anticorrosion ability is insufficient, in early days deep erosions occurs.On the other hand, surperficial Zn concentration ratio 12% is high, and corrosion rate increases.Therefore, surperficial Zn concentration is 0.5 ~ 12%.Preferred scope is 0.5 ~ 10.0%, and preferred scope is 3.0 ~ 5.0% further.
The Zn thickness of diffusion layer of aluminium alloy cage walls in embodiment of the present invention is 100 ~ 300 μm.Being meant to of Zn thickness of diffusion layer: by Zn DIFFUSION TREATMENT, Zn from surface to the degree of depth that the direction of thickness of slab is spread.In embodiment of the present invention, Zn thickness of diffusion layer is: be the distance (thickness) of 0.05% to Zn concentration from tube surfaces.With regard to Zn diffusion layer, the sacrifice corrosion-resistant coating as pipe entirety plays a role, and Zn thickness of diffusion layer is too thin, sacrifices corrosion-resistant coating in early days and loses; Zn thickness of diffusion layer is too thick, and Zn gradient slows down gradually, and sacrifice anticorrosion ability is insufficient.Therefore Zn thickness of diffusion layer is 100 ~ 300 μm.This Zn thickness of diffusion layer also can be 150 ~ 250 μm.
Next, the reason that the composition about the skin material to present embodiment cage walls limits, is described.
Zn makes the current potential of skin material decline, and plays a role as sacrificial anode, improves the corrosion resistance of heat pipe.Its addition less than 1.0% time, inadequate with the potential difference of core, can not get sacrificing anticorrosion ability fully, more than 7.0%, corrosion resistance declines.Therefore Zn addition is the scope of 1.0 ~ 7.0%.The scope be more preferably is 4.0 ~ 5.5%.
Mn is the main adding elements improving intensity, and its addition is fewer than 0.3%, and intensity is not enough, becomes large with the intensity difference of core.Consequently, small crack (crack), surface is produced when pipe manufactures, the reason of breaking when this becomes hair fastener bending machining.On the other hand, addition than more than 1.5% time, the current potential of skin material is high, so be difficult to guarantee the potential difference with core.Cause, the addition of Mn is the scope of 0.3 ~ 1.5%.The scope be more preferably is 0.6 ~ 1.0%.
The impurity Si of the skin material of cage walls, Fe, Cu etc., if the content of Si is less than 0.5%, Fe when be less than 0.6%, Cu being less than 0.2%, do not hinder effect of the present invention.
Ti, Cr, Zr in addition, because have the effect making ingot bar organize homogeneous granular, can contain, but more than 0.2%, forms huge intermetallic compound or extrudability decline, and preferably its content is less than 0.2%.Within the scope of this, do not hinder the effect of heat pipe in present embodiment.This content also can be 0 ~ 0.1% in addition, can also be 0 ~ 0.05%.
The thickness of the skin material of these cage walls, there is no particular limitation, but be preferably 5 ~ 30% of whole wall thickness.The thickness of skin material less than whole wall thickness 5% time, the term of validity of the sacrifice corrosion-resistant coating of heat exchanger is inadequate, and more than 30%, the intensity of heat pipe declines.The scope be more preferably is 6 ~ 15%.
In addition, when the intensity difference of core and skin material is large because core and skin material non-deformability variant, when pipe manufactures, surface produces small crack, the reason of breaking when becoming hair fastener bending machining.Therefore, the difference of hardness of core and skin material is below 15Hv.Be more preferably below 10Hv.
About the sacrifice corrosion-resistant coating of Zn spraying plating
Connect lower in, about the sacrifice corrosion-resistant coating to spraying plating pipe in present embodiment, namely the Zn distribution of Zn diffusion layer carries out the reason that limits, is described.
On the aluminium alloy spraying plating pipe of embodiment of the present invention, by carry out Zn spraying plating outside it after, carry out Zn diffusion heat treatments, form the layer of Zn diffusion.Above-mentioned Zn diffusion layer is lower than the Pitting Potential of the part not spreading Zn in tubing, therefore preventing tubing from corroding by sacrificing corrosion-resisting function, improving the endurance life of tubing.
On aluminium alloy spraying plating pipe, after the Zn composition of the pure Zn of spraying plating or Zn-Al alloy, the Zn diffusion heat treatments of carrying out 30 minutes ~ 10 hours with 400 ~ 550 DEG C is good.Zn spraying plating amount is 5 ~ 28g/m 2.Very little, be difficult to adhere to Zn equably in tube surfaces, Zn spraying plating amount is too many for Zn spraying plating amount, and the amount of the Zn after Zn diffusion heat treatments is too much, causes corrosion rate to increase.Therefore Zn spraying plating amount is 5 ~ 28g/m 2.Be more preferably Zn spraying plating amount 5 ~ 25g/m 2, more preferably 8 ~ 20g/m 2.
Aluminium-alloy pipe in embodiment of the present invention, the surperficial Zn concentration after Zn diffusion heat treatments is 0.5 ~ 15%.Being meant to of surface Zn concentration: during with the arbitrfary point of the analytical equipment measured surface such as EPMA, the concentration of Zn.Surface Zn concentration is too low, and sacrifice anticorrosion ability is insufficient, and wherein a part in early days deep erosions occurs; Surface Zn concentration is too high, causes corrosion rate to increase, and wherein the wall thickness of a part extremely reduces.
In aluminium-alloy pipe in embodiments of the present invention, the average surface Zn concentration after Zn diffusion heat treatments is 1 ~ 12%, Zn thickness of diffusion layer is 100 ~ 300 μm.So-called average surface Zn concentration, refers to: on the surface mutually between to be separated by arbitrary at least 4 points of more than 5mm, measure, the mean value obtained.So-called Zn thickness of diffusion layer, refers to: by Zn DIFFUSION TREATMENT, and Zn is from surface to the degree of depth of thickness of slab direction diffusion, and Zn thickness of diffusion layer is be distance 0.05% from tube surfaces to Zn concentration in embodiments of the present invention.Average Zn concentration and Zn thickness of diffusion layer, represent the amount of the sacrifice corrosion-resistant coating of pipe entirety, average Zn concentration and Zn thickness of diffusion layer too little, sacrifice corrosion-resistant coating in early days and lose.In addition, average Zn concentration is too high, causes corrosion rate to increase; Zn thickness of diffusion layer is too thick, and Zn gradient slows down, and sacrifice anticorrosion ability is insufficient.Therefore, average surface Zn concentration is 1 ~ 12%, and preferred scope is 0.5 ~ 10.0%, and preferred scope is 3.0 ~ 5.0% further.In addition, Zn thickness of diffusion layer is 100 ~ 300 μm, also can be 150 ~ 250 μm.
In embodiments of the present invention in aluminium-alloy pipe, the Zn concentration in the arbitrary surfaces after Zn diffusion heat treatments is: average surface Zn concentration ± 50% within.Relative to average surface Zn concentration, surperficial Zn concentration is too high, and only have this part preferentially to corrode, wall thickness extremely reduces.In order to avoid the generation of this situation, arbitrary surfaces Zn concentration need average surface Zn concentration ± 50% within.Be preferably within ± 30%.
The Zn coverage rate of so-called spraying plating: the state of not adhering to Zn is completely 0%, is 100%Z when whole all being adhered to Zn.The coverage rate of Zn is high, and Zn distribution is homogeneous, and corrosion resistance improves.In the present invention, Zn coverage rate is more than 90%.More preferably I more than 95%.
Sacrifice the formation method of corrosion-resistant coating
Next, about the example of the formation method embodiment of sacrifice corrosion-resistant coating, be described.
On the outside of the cylindric base substrate (Billet) of the Al-Mn-Cu alloy of heat pipe in the present embodiment, sacrifice anticorrosion sheet alloy is bent to cylindrical shape and is covered on outside this, be made into combination base substrate, be heated to 350 ~ 600 DEG C with heating furnace, carry out the process that homogenizes.Afterwards, extrude base substrate with indirect extruder, obtain 2 layers of coated extruding pipe.Then, above-mentioned extruding pipe is carried out stretch process, be processed into fixed external diameter, wall thickness, obtain 2 layers of coated pipe (smooth tubes).This stretch process, preferably uses the block-drawing formula continuous stretcher that productivity ratio is high.
In addition, the base substrate of cylindrical shape being sacrificed anticorrosion material is heated to 350 ~ 600 DEG C, within it go up, the core hollow base substrate hot jacket of cylindrical shape is coordinated (or being translated as " shrink fit "), the 2 layers of hollow base substrate obtained are carried out extruding processing, similarly carry out stretch process afterwards, 2 layers of coated pipe (smooth tubes) can be obtained.
In addition, also can be: on the side of the core thin plate (sheet) of aluminium alloy, roll clad sacrifices anticorrosion material thin plate, obtain 2 layers " clad sheets ", this thin plate roll-in is formed tubulose, afterwards, thin plate interface is welded, as 2 layers of coated resistance weld pipe (Electric resistance welded tube).
On the 2 layers of cage walls manufactured, carrying out diffusion heat treatments, Zn diffusion layer can obtained, namely sacrificing corrosion-resistant coating as mentioned above.
With regard to the formation method of sacrifice corrosion-resistant coating other than the above, also can be: being extruded (hot-extrudable or comply with (conform) extrude), or stretch heat pipe on spraying plating Zn or Al-Zn alloy, carry out diffusion to heat, form Zn diffusion layer, namely sacrifice corrosion-resistant coating.In order to the circumferencial direction at pipe comprehensively whole adhering to the Zn of aequum, during by the circumferential section center of tubing and Zn spray torch line link, the angle formed between the line at circumferential section center, is preferably less than 120 °.Further, the angle formed between the line at circumferential section center, is preferably less than 90 °.With regard to concrete method, adducible example has: the quantity of the Zn spray torch usually used in flat tube is increased to the method for more than 3 from 2; Pipe is made to rotate after spraying plating, the method for point spraying plating several times; Make the method etc. that pipe or spray torch rotate.With regard to Zn spraying plating, also can be carry out after implementing rolling and processing, this rolling and processing be to form groove on the inner face of heat pipe.
In addition, carry out according to the method described above, for forming the pipe (smooth tubes) of sacrificing corrosion-resistant coating, in order to easily carry out the rotary rolling mill of next step operation, carrying out annealing softening in advance and being treated to good.In this case, industrially preferably: annealing temperature is 300 ~ 400 DEG C, the time is 2 ~ 8 hours.
The manufacture method of the fluted heat pipe of inner face band
Then, smooth tubes carries out rotary rolling mill with roll process and ball rolling method etc., manufacture the fluted heat pipe of inner face band (Fig. 3) with ridged fin.
With regard to the fluted heat pipe of inner face band of present embodiment, various sizes can be manufactured according to the purposes of heat exchanger, during for domestic air conditioning, consider the productivity ratio manufacturing pipe, be preferably: external diameter more than φ 4.0mm; Consider the miniaturized lightweight of heat exchanger, be preferably: external diameter below φ 9.54mm.
In addition, with regard to the thick t (with reference to Fig. 4) of bottom, consider compressive resistance, be preferably more than 0.3mm; Consider the miniaturized lightweight of heat exchanger, be preferably below 0.6mm.
In addition, preferably: the height H of the ridged fin of inner face is 0.1 ~ 0.4mm, the vertical angles of the ridged fin of inner face are α 10 ~ 40 °, the quantity of inner face ridged fin is more than 40, lead angle β (angle that inner face ridged fin and pipe range direction are formed, with reference to Fig. 5) is more than 20 °.
After carrying out rotary rolling mill, also annealing softening process can be carried out.Its objective is: the machining deformation brought during removing rolling, makes hair fastener bending machining (serpentine curved processing) easily carry out.Can be: the annealing carrying out 2 ~ 8 hours in 300 ~ 400 DEG C.
Manufacture described above and the fluted heat pipe of inner face band of the present embodiment obtained, processed by expander, be bonded in the patchhole (Fig. 2) of aluminium radiator fin.In order to obtain good bonding, it is suitable for carrying out following steps: setting patchhole and the gap of heat pipe, makes pipe expanding rate (external diameter growth rate) for being about 4 ~ 6%.In addition, with regard to expander processing, without the machine pipe expanding method of mandrel, but by giving the hydraulic extend pipe method of pressing in pipe with oil pressure or hydraulic pressure, can enhance productivity.
Above, be illustrated with regard to embodiments of the present invention, but these are example of the present invention, also can adopt various formation other than the above.
[embodiment]
< embodiment 1>
Then, according to embodiment, the present invention will be described in further detail.
By continuous casting, the alloy of casting table shown in table 1, obtains external diameter φ 47mm with indirect extrusion molding, the extruding pipe of wall thickness 3.5mm.On this extruding pipe, carry out stretch process with block-drawing formula continuous stretcher, obtain external diameter φ 10mm, the stretching tube of wall thickness 0.45mm.
[table 1]
On the stretching tube obtained manufacturing as mentioned above, after carrying out the annealing softening process of 2 hours with 360 DEG C, by inserting plug, (this plug is travelling plug (Floating plug), bar, be integrated with fluted plug (plug)), by travelling mould (Floating dice), processing head (Processing head), mould (Forming dice) carries out the processing of paying groove on inner face, the obtained fluted heat pipe of following inner face band: external diameter: φ 7mm, bottom thick: 0.35mm, the height H of ridged fin: 0.22mm, the quantity of ridged fin is 50, vertical angles α: 15 °, lead angle β: 35 °.Further, finally carry out the annealing softening process of 2 hours with 360 DEG C, complete the fluted heat pipe of inner face band.
For the characteristic of the fluted heat pipe of inner face band of as mentioned above obtained example of the present invention and comparative example, carry out following test.Table 2 shows the result obtained.
(a) tension test
In order to measure the intensity of the fluted heat pipe of inner face band, carry out tension test according to JIS Z2241.
(b) average crystallite particle diameter
From the fluted heat pipe of inner face band obtained, cut out microstructure observation's test film, the measurement of the crystallization particle diameter that is averaged.Specifically, the measurement of average crystallite particle diameter adopts intersection, thickness of pipe direction and these 2 directions of circumferencial direction is carried out, tries to achieve its mean value.
(c) tube expanding workability
Use steel mandrel, the fluted heat pipe of inner face band of above-mentioned external diameter φ 7mm has been carried out expander processing, make external diameter increase by 5%.Afterwards, observe the cross section of pipe, measure the reduction of ridged fin height H, assessment fin breakage.In order to obtain the thermal conduction characteristic of heat exchanger, this fin breakage is preferably below 0.02mm.
(d) hair fastener bendability
By the fluted tube bending of φ 7mm inner face band, carry out the hair fastener bending machining that spacing (Pitch) is 16mm.Visual observations is carried out for the surface after bending machining, confirms whether surface breaks.Now, prepare 10 fluted pipes of inner face band respectively for S1 ~ S17, assess according to once benchmark.
Zero: 10 whole generation of not breaking.
△: only have 1 ~ 9 not have to break.
×: 10 all break.
[table 2]
Be described for the assessment result shown in table 2.Embodiment S1 ~ S11 is the goods in the scope of the invention, its engineering properties, fin breakage, and average crystallite particle diameter has crack-free to occur during hair fastener bending machining, all excellent.And comparative example S12, S15 are because intensity low heat emission sheet breakage is large, can not get the thermal conduction characteristic of wishing.In addition, there is tension failure when stretch process in S13, S14, does not create.In addition, S16 is because average crystallite particle diameter, more than 150 μm, has broken when hair fastener bending machining.In addition, S17 crystal grain is small, although do not break when hair fastener bending machining, but because Si content is extremely low, the problem of generation is: manufacturing cost is high.
< embodiment 2>
By continuous casting, the skin material alloy of casting shown in table 3, by the combination in the core alloy shown in table 1 and table 4, extrude external diameter φ 47mm, wall thickness 3.5mm with indirect extrusion molding, clad ratio is the extruding pipe of 10%.On this extruding pipe, carry out stretch process with block-drawing formula continuous stretcher, obtain external diameter φ 10mm, the stretching tube of wall thickness 0.45mm.Carry out Zn diffusion heat treatments further.
[table 3]
[table 4]
On the stretching tube obtained according to above-mentioned said step, after carrying out the annealing softening process of 2 hours with 360 DEG C, by inserting plug, (this plug is travelling plug (Floating plug), bar, be integrated with fluted plug (plug)), by travelling mould (Floating dice), processing head (Processing head), mould (Forming dice) carries out the processing of paying groove on inner face, the obtained fluted heat pipe of following inner face band: external diameter: φ 7mm, bottom thick: 0.35mm, the height H of ridged fin: 0.22mm, the quantity of ridged fin is 50, vertical angles α: 15 °, lead angle β: 35 °.Further, finally carry out the annealing softening process of 2 hours with 360 DEG C, complete the fluted heat pipe of inner face band.
The characteristic of the fluted heat pipe of inner face band obtained so manufacturing, has carried out following test.Table 5 shows the result obtained.
(a) tension test
In order to measure the intensity of the fluted heat pipe of inner face band, carry out tension test according to JIS Z2241.
(b) section hardness
Measure the core of the fluted heat pipe of inner face band and the hardness of skin material that above-mentioned external diameter is φ 7mm.In addition, the measuring process of hardness is as follows: with the fluted tube section of resin filling band, after grinding, micro Vickers (Micro Vickers hardness tester, alum makes manufactured) is adopted to measure under the condition of load 50g.
(c) hair fastener bendability
By the fluted tube bending of φ 7mm inner face band, carry out the hair fastener bending machining that spacing (Pitch) is 16mm.Visual observations is carried out for the surface after bending machining, confirms whether surface breaks.Now, prepare 10 fluted pipes of inner face band respectively for C1 ~ C12, assess according to once benchmark.
Zero: 10 whole generation of not breaking.
△: only have 2 ~ 9 not have to break.
×: occur 9 ~ 10 and break.
(d) corrosion resistance
In order to assess outside corrosion resistance, for the fluted heat pipe of each inner face band, carry out the CASS test of 1500 hours according to JISZ8681.After test, the corrosion product on the surface of removing test pipe, observes the corrosion condition of pipe, assesses outside corrosion resistance according to or without perforation.At this moment, for C1 ~ C12, prepare 10 fluted heat pipes of inner face band respectively, assess according to following benchmark.
All do not bore a hole for zero: 10.
△: only have 2 ~ 9 not perforation.
×: 9 ~ 10 have perforation.
[table 5]
Be described for the assessment result shown in table 5.With regard to C1 ~ C8, the difference of hardness of core and skin material is little, and do not break during hair fastener bending machining.In addition, corrosion resistance is also good.On the other hand, the poor C9 of Mn, the difference of hardness of its core and skin material is large, and during stretch process, small scar occurs mountain, surface, the starting point occurred of breaking when becoming hair fastener bending machining.The C10 that Mn content is many, the potential difference of its core and skin material is little, and result is: in Kesternich test, occurred perforation.In addition, the C11 that Zn content is many, its corrosion resistance is poor, and result is: in Kesternich test, occurred perforation.And the C12 that Zn content is less, can not can not get sacrificing anticorrosion ability fully, in Kesternich test, create perforation.
< embodiment 3>
By continuous casting, the S10 alloy of casting table 1, obtains external diameter φ 47mm with indirect extrusion molding, the extruding pipe of wall thickness 3.5mm.With block-drawing formula continuous stretcher, stretch process is carried out to this extruding pipe, obtains external diameter φ 10mm, the stretching tube of wall thickness 0.45mm.
On the stretching tube obtained manufacturing as mentioned above, after carrying out the annealing softening process of 2 hours with 360 DEG C, by inserting plug, (this plug is travelling plug (Floating plug), bar, be integrated with fluted plug (plug)), by travelling mould (Floating dice), processing head (Processing head), mould (Forming dice) carries out the processing of paying groove on inner face, the obtained fluted heat pipe of following inner face band: external diameter: φ 7mm, bottom thick: 0.35mm, the height H of ridged fin: 0.22mm, the quantity of ridged fin is 50, vertical angles α: 15 °, lead angle β: 35 °.Further, finally carry out the annealing softening process of 2 hours with 360 DEG C, complete the fluted heat pipe of inner face band.
On the fluted heat pipe of inner face band obtained like this, carry out impeller blasting (shot blasting) process, Zn spraying plating, Zn diffusion heat treatments, complete the fluted heat pipe of inner face band with Zn diffusion layer.The condition of Zn spraying plating, Zn diffusion heat treatments is as shown in table 6.
[table 6]
Characteristic for the fluted heat pipe of inner face band obtained is like this evaluated, and has carried out following test.Table 7 shows the result obtained.
A () Zn distributes
In order to detect surperficial Zn concentration, Zn diffusion length after Zn diffusion heat treatments, carry out EPMA.Detection method is: for each sample, carries out the detection of 10 points, and the distance between these points is more than 5mm.
(b) Zn coverage rate
In order to detect the Zn coverage rate after Zn diffusion heat treatments, adopt the COMPO image of SEM.If covered by Zn and obtain white image; Substrate Al exposes, and obtains black image.Analysis diagram picture, calculates Zn coverage rate.
(c) corrosion resistance
In order to assess outside corrosion resistance, for the fluted heat pipe of each inner face band, carry out the CASS test of 1500 hours according to JISZ8681.After test, the corrosion product on the surface of removing test pipe, observes the corrosion condition of pipe, assesses outside corrosion resistance according to or without perforation.At this moment, for Y10 ~ Y21, prepare 10 fluted heat pipes of inner face band respectively, assess according to following benchmark.
All do not bore a hole for zero: 10.
△: only have 2 ~ 9 not perforation.
×: 9 ~ 10 have perforation.
[table 7]
Be described for the assessment result shown in table 7.In Y1 ~ Y9, do not produce through corrosion, show good corrosion resistance.In Y10,12, because do not reach the lower limit of surperficial Zn concentration, because do not reach the lower limit of average surface Zn concentration in Y14, sacrifice anticorrosion and effectively do not play a role, cause early stage generation through.Because exceed the upper limit of surperficial Zn concentration in Y11,13, exceed the upper limit of average surface Zn concentration in Y15, sacrifice layer consumption is fast, reaches through in early days.Because of the upper limit more than Zn concentration difference in Y16,17, corrosion is concentrated, and causes reaching through in early days.Because do not reach the lower limit of Zn diffusion length in Y18, the amount of sacrifice layer is few, causes reaching through in early days.Because of the upper limit more than Zn diffusion length in Y19, Zn gradient slows down, and sacrifices anticorrosion and does not effectively play a role, cause reaching through in early days.Because Zn coverage rate does not reach lower limit in Y20,21, corrosion is concentrated, and causes reaching through in early days.
Describe the present invention with embodiment above.This embodiment is example, can have various variation, and these variation also belong to scope of the present invention, and this is for understood by one of ordinary skill in the art.
[explanation of symbol]
1 aluminium radiator fin
2 heat pipes (the fluted heat pipe of inner face band)
3 transom windows (Louver)
4 expander plugs (mandrel)
5 pipes (smooth tubes)
6 rolling plugs (Rolled plug)
7 rotating rollers (Rotating roll)
8 inner faces are with the heat pipe of spiral grooves
9 ridged fin
10 sacrifice corrosion-resistant coating

Claims (8)

1. the fluted aluminum alloy heat pipe of inner face band, is characterized in that:
On inner face, the heat pipe of formation 2 or more ridged fin is aluminum alloy heat pipe, containing Mn: 0.8 ~ 1.8 quality % (only representing quality % with % below), Cu: 0.3 ~ 0.8%, and Si: 0.02 ~ 0.2%, remainder is made up of inevitable impurity and Al; Further, the cross section average crystallite particle diameter of above-mentioned heat pipe is less than 150 μm.
2. at the fluted aluminum alloy heat pipe of inner face band as described in claim 1, wherein,
On the surface of above-mentioned heat pipe, surface Zn concentration is more than 0.5%, and average surface Zn concentration is 1 ~ 12%, and the concentration on arbitrary surface be average surface Zn concentration ± 50% within, and have, the Zn diffusion depth from surface is the Zn diffusion layer of 100 ~ 300 μm.
3. the fluted aluminum alloy heat pipe of inner face band as described in claim 2, is characterized in that:
Containing Mn: 0.8 ~ 1.8%, Cu: 0.3 ~ 0.8%, and Si: 0.02 ~ 0.2%, remainder is made up of inevitable impurity and Al; Further, with aluminum alloy heat pipe for core, the feature of this aluminum alloy heat pipe is the cross section average crystallite particle diameter of above-mentioned heat pipe is less than 150 μm, coated skin material Al-Zn alloy outside it, then carries out Zn diffusion heat treatments.
4. the fluted aluminum alloy heat pipe of inner face band as described in claim 3, is characterized in that:
Above-mentioned core after above-mentioned Zn diffusion heat treatments and the difference of hardness of above-mentioned skin material are below 15Hv.
5. the fluted aluminum alloy heat pipe of the inner face band as described in claim 3 or 4, is characterized in that:
Above-mentioned skin material contains Zn: 1.0 ~ 7.0%, Mn: 0.3 ~ 1.5%, and remainder is inevitable impurity and Al.
6. the fluted aluminum alloy heat pipe of inner face band as described in claim 2, is characterized in that:
Containing Mn: 0.8 ~ 1.8%, Cu: 0.3 ~ 0.8%, and Si: 0.02 ~ 0.2%, remainder is inevitable impurity and Al,
Further, the average crystallite particle diameter in above-mentioned heat pipe cross section is less than 150 μm;
Spraying plating Zn on the outer surface of above-mentioned aluminum alloy heat pipe, then carry out Zn diffusion heat treatments.
7. the fluted aluminum alloy heat pipe of inner face band as described in claim 6, is characterized in that:
Relative to the outer surface of heat pipe, the coverage rate of the Zn of institute's spraying plating is more than 90%.
8. the manufacture method of the fluted aluminum alloy heat pipe of the inner face band as described in claim 6 or 7, is characterized in that:
When above-mentioned heat pipe carries out spraying plating, the geometry center in above-mentioned heat pipe cross section is connected with the center of more than 2 (comprising 2) Zn spray torches, connecting line adjacent respectively in above-mentioned geometry center institute angulation be less than 120 °.
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