CN102994816A - High-strength aluminium alloy wire material and preparation method for same - Google Patents
High-strength aluminium alloy wire material and preparation method for same Download PDFInfo
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- CN102994816A CN102994816A CN2012105125004A CN201210512500A CN102994816A CN 102994816 A CN102994816 A CN 102994816A CN 2012105125004 A CN2012105125004 A CN 2012105125004A CN 201210512500 A CN201210512500 A CN 201210512500A CN 102994816 A CN102994816 A CN 102994816A
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Abstract
The invention relates to the field of nonferrous metal wire materials, and particularly a high-strength aluminium alloy wire material and a preparation method for the same. The high-strength aluminium alloy wire material comprises the following constituents in percentage by weight: 0.05-0.1 wt% of silicon, 0.5-0.8 wt% of iron, 0.1-0.4 wt% of copper, 0.06-0.09 wt% of zinc, 0.1-0.4% of boron, 0.02-0.04 wt% of antimony, 0.01-0.02 wt% of strontium, 0.01-0.02 wt% of titanium, 0.02-0.04 wt% of rare earth, and the balance of aluminium and inevitable impurities. The high-strength aluminium alloy wire material provided by the invention increases conductivity, obviously enhances elongation, tensile strength and anti-creeping property, and greatly improves mechanical comprehensive performance by adjusting the content of the rare earth element in the wire material, and introducing other doping elements.
Description
Technical field
The present invention relates to non-ferrous metal wire rod field, particularly relate to a kind of aldural wire rod and preparation method thereof.
Background technology
Aluminium is a kind of electric conductor wire rod commonly used, and with respect to copper wires, it is leavened dough all not as good as copper wires in conductivity, unit elongation, tensile strength etc.Aspect conductivity, the resistivity of soft copper in the time of 20 degrees centigrade is 0.0172*10
-6Ohm meter, specific conductivity is 100%IACS, and the specific conductivity of aluminium is about 61%IACS.In mechanical properties, copper wires also has some superiority with respect to aluminium wire, comprises that unit elongation, tensile strength etc. all are better than the conventional aluminum wire rod.
But aluminium wire is than copper wires, and its low price and lighter weight compare with copper, the aluminium conductor of identical weight, and the current capacity of aluminium wire is much higher than copper wires, and its cost reduces greatly with respect to copper wires.Therefore, in the situation take energy-conserving and environment-protective as major premise, aluminium wire has huge advantage.
In numerous aluminium alloy wiress, rare earth aluminium alloy (RE containing aluminium alloy) gets more and more people's extensive concerning with its excellent performance.Rare earth element is very active, very easily with gas (such as hydrogen), nonmetal (such as sulphur) and metal function, generates corresponding stable compound.After rare earth element adds aluminium alloy, can play the effects such as microalloying, refining purification, grain refinement and modification, in the electrical property that improves aluminium alloy wires, a series of mechanical properties such as its unit elongation, tensile strength, creep resistance also are greatly improved.Because the excellent properties of rare earth aluminium alloy, increasing investigator begins to be devoted to the study on the modification of rare earth aluminium alloy wire rod, and the rare earth aluminium alloy wire rod also becomes this area heat subject in recent years.
Summary of the invention
The shortcoming of prior art the object of the present invention is to provide a kind of aldural wire rod in view of the above, is used for solving the problems of the prior art.
Reach for achieving the above object other relevant purposes, first aspect present invention provides a kind of aldural wire rod, by weight percentage, comprises following component:
Silicon 0.05-0.1wt%;
Iron 0.5-0.8wt%;
Copper 0.1-0.4wt%;
Zinc 0.06-0.09wt%;
Boron 0.1-0.4%;
Antimony 0.02-0.04wt%;
Strontium 0.01-0.02wt%;
Titanium 0.01-0.02wt%;
Rare earth 0.02-0.04wt%;
Surplus is aluminium and inevitable impurity.
Preferably, in the described aldural wire rod, the content 〉=98.1wt% of its aluminium.
Preferably, described rare earth component, take aluminium alloy middle-weight rare earths gross weight as benchmark, composed as follows:
Light rare earths 70-80wt%;
Middle-weight rare earths 5-10wt%;
Heavy rare earths 15-20wt%.
Described light rare earths is selected from one or more among lanthanum La, cerium Ce, praseodymium Pr, neodymium Nd and the promethium Pm, and wherein the weight sum of La, Ce, P, Nd accounts for more than the 90wt% of light rare earths gross weight.
Preferably, described light rare earths is the mixing of lanthanum La, cerium Ce, praseodymium Pr and neodymium Nd, and wherein the weight ratio of lanthanum La, cerium Ce, praseodymium Pr and neodymium Nd is 30-39.98:60-69.98:0.01-0.1:0.01-0.1.
Described middle-weight rare earths is selected from one or more among samarium Sm, europium Eu, gadolinium Gd, terbium Tb and the dysprosium Dy.
Preferably, described middle-weight rare earths is Eu.
Described heavy rare earths is selected from one or more among holmium Ho, erbium Er, thulium Tm, ytterbium Yb, lutetium Lu, yttrium Y and the scandium Sc, and wherein Sc accounts for more than the 50wt% of heavy rare earths weight.
Preferably, described heavy rare earths is Sc.
Second aspect present invention provides the preparation method of described aldural wire rod, comprises the steps:
1) melting: by proportioning fusing under 720-730 ℃ with aluminium and aluminum-iron alloy, be warming up to again under 780-790 ℃ by proportioning adding copper, zinc, antimony, strontium, titanium first; After fully mixing, lower to proportioning adding light rare earths at 760-770 ℃; After fully mixing, lower to proportioning adding middle-weight rare earths at 730-740 ℃; After fully mixing, lower to proportioning adding heavy rare earths and boron at 780-790 ℃; Passing into refining agent after fully mixing carries out refining, skims; Again aluminium liquid is carried out stokehold chemistry real-time analysis, adjust the aluminium fluid component according to the weight ratio of each component in the prescription after analyzing, aluminium liquid is carried out feed supplement;
2) insulation: with step 1 gained aluminium liquid insulation 15-20min under 720-730 ℃;
3) continuous casting and rolling: step 2 gained aluminium liquid is carried out casting and rolling process, the span of control of indices is: pouring temperature is 690-700 ℃, and burning the teeming speed degree is 7.4-7.6m/min, and speed of cooling is 20-22 ℃/s, the temperature of advancing to roll of rolling the district is 460-470 ℃, and going out to roll temperature is 275-285 ℃;
Preferably, described copper, zinc, antimony, strontium, titanium, light rare earths, middle-weight rare earths, heavy rare earths, boron all add in the mode of the master alloy of this material and aluminium.Add fashionablely at master alloy, should be as far as possible feed intake at the different positions of aluminium liquid so that the composition of master alloy can be quicker, in aluminium liquid, disperse equably.
In addition, all inevitably contain a small amount of silicon owing to produce in used aluminium ingot and the aluminium alloy, so silicon need not extra adding.
Preferably, in the described step 1 refining agent by NaCl, KCl and Na
3AlF
6Form, the importing temperature of refining agent is 775-785 ℃, and the weight ratio of refining agent and aluminium liquid is 2-3:6000, and the weight percent of each component is in the described refining agent: NaCl 30-45wt%, KCl 30-45wt%, Na
3AlF
625-35wt%.
Preferably, the weight percent of each component is in the described refining agent: NaCl 35wt%, KCl 35wt%, Na
3AlF
630wt%.
Described refining agent add fashionable should being pressed under the liquid aluminum.
Preferably, in the described step 1, after refining agent adds, adopt the mode of permanent magnetic stirring to stir aluminium liquid, make its even fusing, be scattered in the aluminium liquid, to improve the refining effect of refining agent.
Preferably, in the described step 1, the reaction times of refining agent is more than 15 minutes, namely adds at refining agent and takes off later on slag operation in 15 minutes again.
When skimming operation, should remove surface scum as far as possible, introduce the impurity that is brought to reduce refining agent.Need not to add insulating covering agent in the whole refining process.
Prepare aluminium alloy wires of the present invention, need not to add insulating covering agent when melting, and compare the electrical property that adds insulating covering agent technique gained wire rod and have no adverse effects, gained aluminium bar and monofilament can peelings, and Impurity removal is more prone to, and the integrated operation step is simplified greatly.It is embodied in aluminium liquid after refining is skimmed, and no longer needs to add insulating covering agent, can carry out the continuous casting and rolling operation after directly leaving standstill.
The present invention removes the use of insulating covering agent from, has not only reduced operation steps, has saved time and material cost, has more avoided insulating covering agent to add the fashionable possibility that may introduce other impurity.
The chemistry real-time analysis of described stokehold is carried out according to the regulation of ASTM B800-2005, its concrete grammar is: taking a sample with special tool near aluminium liquid middle position, get behind the sample in time water cooling forming, directly carried out the composition detection analysis with spectrograph after two end faces are polished.
Preferably, in the described step 3, the length of rolling the district is 51m, and the frame number is 15, and roll speed is 3.7-3.9m/s, and going out shank diameter is 8.5-9.5mm.
In the described step 3, the ratio of the inside and outside cooling water inflow of continuous casting turbine is 3:2 in the casting and rolling process, and coolant water temperature is lower than 50 ℃.Casting machine voltage is 60-90V.
When aluminium liquid waters package operation up and down, keep aluminium liquid surface-stable, and held stationary is continuous, must not shake and pause, need not in addition the oxide skin on aluminium liquid surface chosen and remove.
Aldural wire rod provided by the present invention, by the adjustment to the wire rod Rare Earth Element Contents, and introduce other doped elements, its specific conductivity of prepared aluminium alloy wires gets a promotion, and its elongation, tensile strength and creep resistance character are improved significantly, and mechanical integrated performance is significantly improved.In addition, aluminium alloy wires provided by the present invention skin effect phenomenon seldom occurs, so that quality and the production efficiency of aluminium alloy monofilament wire all are greatly improved in cold drawn silk process when preparation aluminium alloy monofilament wire.
Third aspect present invention provides a kind of rare earth aluminium alloy stranded conductor, and its preparation method comprises the steps:
1) cold drawn silk: prepare rare earth aluminium alloy monofilament wire by cold drawn silk technique by described aldural wire rod;
2) stranded: by many described aluminium alloy monofilament wires, stranded by concentric lay technique;
3) annealing: carry out anneal after the aluminium alloy stranded conductor sabot with step 2 gained.
In the described step 2, the method of annealing is syllogic annealing, the annealing of described syllogic specifically refer to the aluminium alloy stranded conductor dish of step 1 gained with after, place annealing device, described annealing device is divided into three warm areas in upper, middle and lower, the temperature that wherein goes up warm area is minimum, and the temperature of lower warm area is not less than middle warm area, the temperature range of described upper warm area is 340-360 ℃, the temperature range of described middle warm area is 350-370 ℃, the temperature range of described lower warm area is 360-370 ℃, and the time of annealing is 4-10h.
Preferably, three warm areas in described upper, middle and lower are in the annealing device, from top to bottom five equilibrium three warm areas of tempering stove process plate wherein.
Described annealing process can make more closely combination between each monofilament in the aluminium alloy stranded conductor, reduces the space between the monofilament, has greatly improved the density of aluminium alloy stranded conductor, and stacking factor reaches more than 92%.The aluminium alloy stranded conductor of gained can directly coat the screen layer for balanced electric field, and the phenomenon of aluminium alloy stranded conductor can not appear infiltrating in the screen layer that coats, and has guaranteed the even distribution of screen layer, has guaranteed the premium properties of conductor.
Gained is coated with the aluminium alloy stranded conductor of screen layer can be as required, further coated insulation layer and protective layer, thus obtain required aluminium alloy cable.
Fourth aspect present invention provides a kind of rare earth aluminium alloy abnormity stranded conductor, the many aluminium alloy monofilament wire concentric lay of serving as reasons form, except the twisted wire center, each layer forms by many allotype aluminum alloy monofilament wire concentric strandings, the cross section of described allotype aluminum alloy monofilament wire is special-shaped isosceles trapezoid, described special-shaped isosceles trapezoid replaces with the isosceles trapezoid of circular arc for long base, the center of circle of described circular arc overlaps with the intersection point of the extended line of the stringcourse of described special-shaped isosceles trapezoid, the twisted wire center of described allotype aluminum alloy stranded conductor is formed by many fan-shaped aluminium alloy monofilament wire strandings, perhaps being formed by many described allotype aluminum alloy monofilament wire strandings, perhaps is single circular aluminum alloy filaments wire.
Described each aluminium alloy monofilament wire is prepared by described aldural wire rod.
Concrete, described each special-shaped aluminium alloy single silk wire is generated by circular aluminum alloy filaments wire squeezes, and described circular aluminum alloy filaments wire is prepared by cold drawn silk technique by described aldural wire rod.
The cross section of described circular aluminum alloy filaments wire is circular.
The cross section of described fan-shaped aluminium alloy monofilament wire is fan-shaped.
Further, four of described special-shaped isosceles trapezoid angles are fillet.
Further, described three fan-shaped angles are fillet.
Described special-shaped isosceles trapezoid is except long base, and the main part on all the other each limits substantially linearly.
Further, the shape of cross section of the used allotype aluminum alloy monofilament of same layer wire is consistent.
The quantity n of the used allotype aluminum alloy monofilament of each layer wire is:
Wherein, θ is in the cross section of the used allotype aluminum alloy monofilament of this layer wire, the angle of described special-shaped isosceles trapezoid two waists.
Further, described θ satisfies following condition:
Described h is the thickness of described allotype aluminum alloy monofilament wire place layer;
Described R is the outside radius of described allotype aluminum alloy monofilament wire place layer.
In the cross section of the used allotype aluminum alloy monofilament of each layer wire, the high h ' of described special-shaped isosceles trapezoid is substantially suitable with this layer thickness h, consider stranded issuable micro-deformation, preferably equal or a little more than this layer thickness h, as be this layer thickness h 1-1.05 doubly.
In the cross section of the used allotype aluminum alloy monofilament of each layer wire, the arc radius R ' of described special-shaped isosceles trapezoid is slightly larger than the outside radius R of this layer.Better, the 1.02-1.05 of the outside radius R that described arc radius R ' is this layer is doubly.
The value of h can be set according to actual needs, such as 1.6mm≤h≤3.7mm.
The value of R is also set according to the actual needs of conventional stranded conductor, such as 2.4mm≤R≤12mm.
Further, described θ also satisfies following condition simultaneously:
When satisfying above-mentioned condition, cooperate more closely between each allotype aluminum alloy monofilament wire with layer.
Better, the condition that described θ also satisfies simultaneously is:
Allotype aluminum alloy monofilament wire of the present invention can be obtained through the physics extruding by circular aluminum alloy filaments wire.
Further, the minimum radius r that pushes used circular aluminum alloy filaments wire is:
Better, pushing used circular aluminum alloy filaments wire, can to select radius be the 1.03-1.07 circular aluminum alloy filaments wire doubly of minimum radius r.
Concrete, circular aluminum alloy filaments wire can be sent into the aluminum-extruding machine extruding acquisition that a line ball pass is corresponding special-shaped isosceles trapezoid.
Fan-shaped aluminium alloy monofilament wire can be sent into circular aluminum alloy filaments wire one line ball pass and be fan-shaped aluminum-extruding machine extruding acquisition.
Allotype aluminum alloy stranded conductor of the present invention can adopt following method preparation:
1) designs thickness and the outside radius of the stranded required number of plies and each layer according to the external diameter of required stranded conductor, and determine the θ angle of each layer allotype aluminum alloy monofilament wire and height and the arc radius in special-shaped isosceles trapezoid cross section;
2) the circular aluminum alloy filaments wire squeezes of calculating and selection correct radial becomes required allotype aluminum alloy monofilament wire;
3) according to design, each aluminium alloy monofilament wire is fitted into frame type stranding machine and obtains described allotype aluminum alloy stranded conductor through concentric lay.
Further, be fixed with several special-shaped monofilament wire steady arms on the distributor plate of described frame type stranding machine, described special-shaped monofilament wire steady arm comprises base and is located at notch on the base, base is fixed on the distributor plate of frame type stranding machine, the cross section of notch is interior narrow outer wide uncovered isosceles trapezoid, and the axially parallel of notch is in the trend of monofilament wire.The use of special-shaped monofilament wire steady arm guarantees that combination is compact between each monofilament wire so that allotype aluminum alloy stranded conductor monofilament lines when carrying out concentric lay can not be shifted, overturn, and need not further anneal.
Above-mentioned allotype aluminum alloy stranded conductor need not to press when carrying out concentric lay.Further, make also need not anneal behind the allotype aluminum alloy stranded conductor can the outsourcing conductor shield.
Rare earth aluminium alloy abnormity stranded conductor provided by the present invention, be special-shaped isosceles trapezoid with the Cross section Design of aluminium alloy monofilament wire, the aluminium alloy monofilament wire in this kind cross section, after concentric layer is stranded, capable assembling is the approximate circle that interlocks layer by layer annular, and the gap reduces greatly between each monofilament conductor of such stranded conductor, and need not to press can substantially realize closely stranded, and the wire after stranded need not anneal, and stacking factor reaches more than 92%.Gained rare earth aluminium alloy abnormity stranded conductor can directly coat the screen layer for balanced electric field, and the phenomenon of the stranded stranded conductor of aluminium alloy inside can not appear infiltrating in the screen layer that coats, and has guaranteed the even distribution of screen layer, has guaranteed the premium properties of conductor.
Allotype aluminum alloy stranded conductor of the present invention is applicable to various electric power aluminum alloy materials.
Gained allotype aluminum alloy stranded conductor can further be coated with screen layer, insulation layer and protective layer as required, thereby obtains required aluminium alloy cable.
Description of drawings
Fig. 1 is shown as the cross sectional representation of allotype aluminum alloy monofilament wire.
Fig. 2 is shown as allotype aluminum alloy monofilament wire distortion synoptic diagram.
Fig. 3 is shown as allotype aluminum alloy stranded conductor cross sectional representation.
The element numbers explanation:
θ: the angle of special-shaped isosceles trapezoid two waists
H ': the height of special-shaped isosceles trapezoid is suitable with the thickness of its place layer
R ': the radius of special-shaped isosceles trapezoid circular arc
R: the radius that is used for the circular aluminum alloy filaments wire of extruding allotype aluminum alloy monofilament wire
Embodiment
Below by specific specific examples explanation embodiments of the present invention, those skilled in the art can understand other advantages of the present invention and effect easily by the disclosed content of this specification sheets.The present invention can also be implemented or be used by other different embodiment, and the every details in this specification sheets also can be based on different viewpoints and application, carries out various modifications or change under the spirit of the present invention not deviating from.
Notice, the not concrete processing unit that indicates or device all adopt conventional equipment or the device in this area in the following example; All force value and scope all refer to absolute pressure.
Should be understood that in addition that one or more method stepss of mentioning among the present invention do not repel before and after described combination step can also exist the additive method step or can also insert the additive method step between these steps of clearly mentioning, except as otherwise noted; Will also be understood that, the relation of being connected between one or more equipment of mentioning among the present invention/device is not repelled before and after described clustered aggregates/device and can also be had other equipment/devices or can also insert other equipment/devices between these two equipment/devices clearly mentioning, except as otherwise noted.And, except as otherwise noted, the numbering of various method steps is only for differentiating the convenient tool of various method steps, but not ordering or the enforceable scope of restriction the present invention for limiting various method steps, the change of its relativeness or adjustment, in the situation without essence change technology contents, when also being considered as the enforceable category of the present invention.
The appended graphic structure that illustrates of this specification sheets, ratio, size etc., equal contents in order to cooperate specification sheets to disclose only, understand and reading for person skilled in the art scholar, be not to limit the enforceable qualifications of the present invention, so technical essential meaning of tool not, the adjustment of the modification of any structure, the change of proportionlity or size, not affecting under the effect that the present invention can produce and the purpose that can reach, all should still drop on disclosed technology contents and get in the scope that can contain.Simultaneously, quote in this specification sheets as " on ", D score, " left side ", " right side ", " centre " reach the term of " " etc., also only for ease of understanding of narrating, but not in order to limit the enforceable scope of the present invention, the change of its relativeness or adjustment, under without essence change technology contents, when also being considered as the enforceable category of the present invention.
As employed in the whole specification sheets, following abbreviation has following implication, unless obviously refer else in the literary composition: ℃=degree centigrade; The 0K=Kelvin's temperature; The Gpa=giga pascals; The g=gram; The mg=milligram; The L=liter; M=rice; The A=ampere; The dm=decimetre; The um=micron; Ppm=1,000,000/; Ppb=1,000,000,000/; The mm=millimeter; M=mole/L.
Embodiment 1-7
The preparation of aldural wire rod:
(1) melting: according to the prescription of table 1, first by proportioning with aluminium and aluminum-iron alloy 720-730 ℃ of lower fusing, be warming up to again under 780-790 ℃ by proportioning and add copper, zinc, antimony, strontium, titanium in the mode of master alloy; After fully mixing, lower to proportioning adding light rare earths-aluminium intermediate alloy at 760-770 ℃; After fully mixing, lower to proportioning adding europium-aluminium intermediate alloy at 730-740 ℃; After fully mixing, lower to proportioning adding scandium-aluminium intermediate alloy and boron-aluminium intermediate alloy at 780-790 ℃; Add fashionablely at master alloy, should be as far as possible feed intake at the different positions of aluminium liquid so that the composition of master alloy can be quicker, in aluminium liquid, disperse equably; Pass into refining agent after fully mixing under 775-785 ℃ and carry out refining, the component of described refining agent is: NaCl 35wt%, KCl 35wt%, Na
3AlF
630wt%.The weight ratio of refining agent and aluminium liquid is 3:6000, and refining agent reacted more than 15 minutes, skimmed again; Carry out stokehold chemistry real-time analysis after skimming, and carry out feed supplement according to analytical results;
(2) insulation: with step 1 gained aluminium liquid insulation 15-20min under 720-730 ℃;
(3) continuous casting and rolling: step 2 gained aluminium liquid is carried out casting and rolling process, the span of control of indices is: pouring temperature is 690-700 ℃, and burning the teeming speed degree is 7.4-7.6m/min, and speed of cooling is 20-22 ℃/s, the temperature of advancing to roll of rolling the district is 460-470 ℃, and going out to roll temperature is 275-285 ℃; The length of rolling the district is 51m, and the frame number is 15, and roll speed is 3.7-3.9m/s, and going out shank diameter is 8.5-9.5mm.The ratio of the inside and outside cooling water inflow of continuous casting turbine is 3:2 in the casting and rolling process, and coolant water temperature is lower than 50 ℃.Casting machine voltage is 60-90V.The performance of gained aluminium alloy wires is as shown in table 2.
Table 1
* each light rare earths accounts for the weight percent of light rare earths total amount
Table 2
* the detection method of creep is: according to standard JIS Z2241, under 150 ℃ and 1/5 0.2% yield strength, the gained aluminium alloy wires is carried out 100 hours creep resistance experiment, take %/hr as unit, calculate its average deformation value hourly.The detection method reference standard of described 0.2% yield strength: JID Z2241.
Can find by table 2, aldural wire rod provided by the present invention, by the adjustment to the wire rod Rare Earth Element Contents, and introduce other doped elements, its specific conductivity of prepared aluminium alloy wires improves, and its elongation, tensile strength and creep resistance character are improved significantly, and mechanical integrated performance is splendid.In addition, aluminium alloy wires provided by the present invention skin effect phenomenon seldom occurs, so that quality and the production efficiency of aluminium alloy monofilament wire all are greatly improved in cold drawn silk process when preparation aluminium alloy monofilament wire.
Embodiment 8
The preparation of rare earth aluminium alloy stranded conductor:
1) cold drawn silk: the aluminium alloy wires of embodiment 1 gained is obtained rare earth aluminium alloy monofilament wire by cold drawn silk technique;
2) stranded: long-pending by the stranded acquisition cross-sectional area of conductor of concentric lay technique is 70mm
2The rare earth aluminium alloy stranded conductor;
3) annealing: the rare earth aluminium alloy stranded conductor of step 2 gained is carried out sabot and anneal; Sabot quantity is the 70m/ dish, the dish specification is 1600mm, the annealing of employing syllogic, annealing device is divided into three warm areas in upper, middle and lower of five equilibrium, the temperature of upper warm area is 340-350 ℃, the temperature of middle warm area is 350-360 ℃, and the temperature range of described lower warm area is 360-370 ℃, and the time of annealing is 6h.
Behind annealing process, in the aluminium alloy stranded conductor of gained between each monofilament in conjunction with tightr, without obvious space, the density of aluminium alloy stranded conductor is greatly enhanced between the monofilament, stacking factor reaches more than 92%.
Embodiment 9
The preparation of rare earth aluminium alloy abnormity stranded conductor:
1) cold drawn silk: the aluminium alloy wires of embodiment 1 gained is obtained rare earth aluminium alloy monofilament wire by cold drawn silk technique.
2) first twist layer by layer: as shown in Figure 3, the stranded center of this allotype aluminum alloy stranded conductor is that radius is the circular monofilaments of 1.39mm.The first layer is formed by 4 fan-shaped aluminium alloy monofilament wire strandings, and the cross section of described fan-shaped aluminium alloy monofilament wire is fan-shaped, and described three fan-shaped angles are fillet.This layer outside radius R is 2.55mm, and the fan-shaped angle of used fan-shaped aluminium alloy monofilament conductive wire cross-section is 89 °, and radius is suitable with this layer outside radius; The structure of monofilament sees figures.1.and.2;
3) second twist layer by layer: as shown in Figure 3, the second layer is formed by 9 allotype aluminum alloy monofilament wire strandings, this layer thickness is 2.3mm, outside radius is 4.85mm, the θ angle of used allotype aluminum alloy monofilament wire is 39 °, the height of its cross section abnormity isosceles trapezoid is suitable with this layer thickness, and arc radius R ' is 5.0mm, and adopting diameter is the circular monofilaments crimp acquisition of 2.8mm;
4) the 3rd twist layer by layer: as shown in Figure 3, the 3rd layer is formed by 14 allotype aluminum alloy monofilament wire strandings, this layer thickness is 2.25mm, outside radius is 7.1mm, the θ angle of used allotype aluminum alloy monofilament wire is 25 °, the height of its cross section abnormity isosceles trapezoid is suitable with this layer thickness, and arc radius R ' is 7.3mm, and adopting diameter is the circular monofilaments crimp acquisition of 2.8mm;
The circular monofilaments that is able to is that rare earth aluminium alloy abnormity stranded conductor is twisted at three of stranded center layer by layer, when carrying out concentric lay, need not to press, and stacking factor reaches more than 92%.Make smooth outer surface rounding behind the allotype aluminum alloy stranded conductor, and make very conveniently, need not anneal can the outsourcing conductor shield, has improved the electrical property of stranded conductor.In conjunction with compact, the phenomenon that the stranded stranded conductor of aluminium alloy inside can not occur infiltrating has guaranteed the even distribution of screen layer, has guaranteed the premium properties of conductor between its each monofilament wire.
The above; it only is preferred embodiment of the present invention; be not to any formal and substantial restriction of the present invention; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the inventive method, also can make some improvement and replenish, these improvement and replenish and also should be considered as protection scope of the present invention.All those skilled in the art, in the situation that does not break away from the spirit and scope of the present invention, a little change of making when utilizing the disclosed above technology contents, the equivalent variations of modifying and developing are equivalent embodiment of the present invention; Simultaneously, the change of any equivalent variations that all foundations essence technology of the present invention is done above-described embodiment, modify and differentiation, all still belong in the scope of technical scheme of the present invention.
Claims (10)
1. aldural wire rod by weight percentage, comprises following component:
Silicon 0.05-0.1wt%;
Iron 0.5-0.8wt%;
Copper 0.1-0.4wt%;
Zinc 0.06-0.09wt%;
Boron 0.1-0.4%;
Antimony 0.02-0.04wt%;
Strontium 0.01-0.02wt%;
Titanium 0.01-0.02wt%;
Rare earth 0.02-0.04wt%;
Surplus is aluminium and inevitable impurity.
2. a kind of aldural wire rod as claimed in claim 1 is characterized in that, described rare earth component is take aluminium alloy middle-weight rare earths gross weight as benchmark, composed as follows:
Light rare earths 70-80wt%;
Middle-weight rare earths 5-10wt%;
Heavy rare earths 15-20wt%.
3. a kind of aldural wire rod as claimed in claim 2 is characterized in that described light rare earths is selected from one or more in lanthanum, cerium, praseodymium, neodymium and the promethium, and wherein the weight sum of lanthanum, cerium, praseodymium, neodymium accounts for more than the 90wt% of light rare earths gross weight.
4. a kind of aldural wire rod as claimed in claim 2 is characterized in that described middle-weight rare earths is selected from one or more in samarium, europium, gadolinium, terbium and the dysprosium.
5. a kind of aldural wire rod as claimed in claim 4 is characterized in that, described middle-weight rare earths is europium.
6. a kind of aldural wire rod as claimed in claim 2 is characterized in that described heavy rare earths is selected from one or more in holmium, erbium, thulium, ytterbium, lutetium, yttrium and the scandium, and wherein scandium accounts for more than the 50wt% of heavy rare earths weight.
7. a kind of aldural wire rod as claimed in claim 6 is characterized in that, described heavy rare earths is scandium.
8. such as the preparation method of the described aldural wire rod of the arbitrary claim of claim 1-7, comprise the steps:
1) melting: by proportioning fusing under 720-730 ℃ with aluminium and aluminum-iron alloy, be warming up to again under 780-790 ℃ by proportioning adding copper, zinc, antimony, strontium, titanium first; After fully mixing, lower to proportioning adding light rare earths at 760-770 ℃; After fully mixing, lower to proportioning adding middle-weight rare earths at 730-740 ℃; After fully mixing, lower to proportioning adding heavy rare earths and boron at 780-790 ℃; Passing into refining agent after fully mixing carries out refining, skims; Again aluminium liquid is carried out stokehold chemistry real-time analysis, adjust the aluminium fluid component according to the weight ratio of each component in the prescription after analyzing, aluminium liquid is carried out feed supplement;
2) insulation: with step 1 gained aluminium liquid insulation 15-20min under 720-730 ℃;
3) continuous casting and rolling: step 2 gained aluminium liquid is carried out casting and rolling process, the span of control of indices is: pouring temperature is 690-700 ℃, and burning the teeming speed degree is 7.4-7.6m/min, and speed of cooling is 20-22 ℃/s, the temperature of advancing to roll of rolling the district is 460-470 ℃, and going out to roll temperature is 275-285 ℃;
9. rare earth aluminium alloy stranded conductor, its preparation method comprises the steps:
1) cold drawn silk: prepare rare earth aluminium alloy monofilament wire by cold drawn silk technique by the described aldural wire rod of the arbitrary claim of claim 1-7;
2) stranded: by many described aluminium alloy monofilament wires, stranded by concentric lay technique;
3) annealing: carry out anneal after the aluminium alloy stranded conductor sabot with step 2 gained.
10. rare earth aluminium alloy abnormity stranded conductor, the many aluminium alloy monofilament wire concentric lay of serving as reasons form, except the twisted wire center, each layer forms by many allotype aluminum alloy monofilament wire concentric strandings, the cross section of described allotype aluminum alloy monofilament wire is special-shaped isosceles trapezoid, described special-shaped isosceles trapezoid replaces with the isosceles trapezoid of circular arc for long base, the center of circle of described circular arc overlaps with the intersection point of the extended line of the stringcourse of described special-shaped isosceles trapezoid, the twisted wire center of described allotype aluminum alloy stranded conductor is formed by many fan-shaped aluminium alloy monofilament wire strandings, perhaps formed by many described allotype aluminum alloy monofilament wire strandings, perhaps be single circular aluminum alloy filaments wire, described each aluminium alloy monofilament wire is by the described aldural wire rod preparation of the arbitrary claim of claim 1-7.
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