CN205236987U - Preparation facilities of big thin brilliant homogeneity aluminum alloy ingot casting of specification - Google Patents
Preparation facilities of big thin brilliant homogeneity aluminum alloy ingot casting of specification Download PDFInfo
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Abstract
The utility model relates to a preparation facilities of big thin brilliant homogeneity aluminum alloy ingot casting of specification belongs to metal material processing field. The device mainly comprises even cooler, hot top, electromagnetic agitator, crystallizer, dummy ingot, the hot top sets up in the top of crystallizer, and electromagnetic agitator sets up at hot top and crystallizer peripherally, and the dummy ingot is located the crystallizer below, and even cooler sets up in the crystallizer, and even cooler comprises inner tube and outer tube. The utility model discloses an apply in the crystallizer even cooling and the outer electromagnetic stirring's of crystallizer coupling special treatment to the alloy fuse -element, the evenly even big specification aluminum alloy ingot casting of tiny, composition of tissue is prepared out to the effective control of bulky alloy fuse -element temperature field and composition field uniformity to the realization. The utility model discloses simple structure, the method is feasible, the effect is showing, production efficiency is high, easy and massive industrial production combines together, has wide industrial application prospect in manufacturing fields such as aerospace, track traffic, boats and ships.
Description
Technical field
The utility model belongs to metal material processing field, particularly a kind of large thin brilliant homogeneous aluminium alloy cast ingot of specificationPreparation facilities.
Background technology
It is light that large-size aluminum alloy ingot is lifted foot in the effect in the Large-Scale Equipment fields such as Aero-Space, track traffic, boats and shipsHeavy. But adopt large-size aluminum alloy ingot prepared by traditional semi-continuous casting method inevitably to exist tissue thickInhomogeneous greatly, component segregation is serious, the defect problem such as easy to crack, causes poor product quality and yield rate low, can notMeet the demand of the large-size high-tensile aluminum alloy materials of high-end manufacturing industry to high-quality.
It is high, clean and can accurately design and the feature such as control that electromagnetic field has noncontact, energy density, at metal materialIncreasing effect is being brought into play in material preparation shaping field. US Patent No. 4229210, US4434837 discloseSeveral electromagnetic agitation methods of preparing metal semi-solid slurry or continuous casting material, its principle is to utilize strong electromagnetism senseStress suppresses separating out of primary dendrite, prepares spherical or granular primary crystal semi-solid metal slurry and semi-solid continuous castingBlank. But due to the kelvin effect of alternating electromagnetic field, along with ingot casting size increases, stirring action is in ingot casting limit portionLarger with heart portion difference, ingot structure homogeneity of ingredients is difficult to control, and the semi-solid blank size of preparation can not conventionallyExceed 6 inches.
In order to improve the inhomogeneities of traditional electromagnetic stirring method, Chinese patent CN101745629A discloses a kind of ringSeam electromagnetic agitation is prepared the method for semi-solid alloy slurry, and its cardinal principle is: establish at melt treatment Shi centerPut circular Quench rod, between the outer wall of Quench rod and the inwall of melt treatment chamber, form a circular ring-shaped narrow slit. RightAlloy melt in narrow annular gap is implemented electromagnetic agitation processing, effectively avoids electromagnetic induction Kelvin effect to causeThe inhomogeneities of mixing power, Temperature Field in Melt is more even, and the more traditional electromagnetic agitation method of structural constituent uniformity hasObviously improve. But along with the increase of ingot casting size, heart portion and the limit portion temperature difference increase, due to melt in casting processThis single refrigerating mode from outside to inside, the method also cannot effectively be controlled the equal of He Cheng branch, the interior temperature field of meltEven property, structural constituent uniformity variation when therefore ingot casting size exceedes 12 inches.
Utility model content
The utility model for be large-size aluminum alloy ingot, preparation the type ingot casting has very large difficult point, spyNot that difficulty is larger for high-alloying 7xxx series alloys. One, easily produces grand micro-in casting processSee segregation, cause the deviation of composition structure property, ingot casting hot tearing trend is larger, and these show high-alloying alloy cast ingotResemble particularly outstanding; Its two, prepare large size ingot-casting, in process of setting, radial temperature difference is larger, the even property of inhomogeneous cooling is moreObviously, cause organizing thick inhomogeneous, component segregation is serious. In order fundamentally to solve, large size ingot-casting existsOrganize thick inhomogeneous, component segregation, the defect problem such as easy to crack, the utility model proposes a kind of large specification thinPreparation method and the device thereof of brilliant homogeneous aluminium alloy cast ingot.
Major technique thought of the present utility model is: the alloy melt in semi-continuous casting process is applied evenly coolingWith electromagnetic agitation coupling processing, increase the cooling dimension in Casting Ingot Solidification Process, the solid of strengthening process of setting meltChange convection current, ensure the uniformity of He Cheng branch, large volume alloy melt temperature field, the pressure that realizes large volume melt is equalEven solidifying, thus prepare the thin brilliant homogeneous aluminium alloy cast ingot of large specification.
For realizing the object of above utility model, by the following technical solutions:
A preparation facilities for the thin brilliant homogeneous aluminium alloy cast ingot of large specification, this device mainly by even cooler, Re Ding,Magnetic stirrer, crystallizer, dummy ingot composition; Described heat top is arranged at the top of crystallizer, and described electromagnetism stirsMix device and be arranged on heat top and crystallizer periphery, described dummy ingot is positioned at crystallizer below, and described even cooler is establishedBe placed in crystallizer, described even cooler is made up of inner and outer tubes.
Evenly the top of the outer tube of cooler is adiabatic end, and bottom is colling end; Inner tube comprises spiral inner tube and differenceBe arranged on arrival end and the port of export of spiral inner tube entrance and exit, spiral inner tube is arranged on outer tube in a spiral mannerIn colling end.
Evenly the colling end of cooler outer tube is hemispherical, and hemisphere external diameter is 100～800mm, adopts high temperature resistant leadingHot material is made, as graphite, copper, molybdenum, titanium and composite thereof; Adiabatic end for cylindrical shape and with bottom colling endSmooth excessiveness, external diameter is not more than colling end hemisphere external diameter, and outside dimension is 100～800mm, and thickness is 3～20mm,Thickness is identical with colling end, adopts high temperature resistant insulating ceramic material to make.
The maximum radius place of colling end is provided with blade construction, and the number of blade is 0～8, is preferably 3～5, and blade is wideDegree is 10～100mm, and vane thickness is 2～8mm, has the effect of downward drive melt flows when blade rotation,Drive melt to collect to colling end bottom downwards, blade adopts exotic material to make, as copper, molybdenum, titanium, potteryAnd composite.
Inner tube is made up of the good material of thermal conductivity, as copper, steel, titanium and alloy thereof and composite; Inner tube diameterBe 2～30mm, thickness 0.5～5mm, the spiral numerical digit 3～50 of spiral inner tube, helix pitch is 0～10mm,Be preferably 3～5mm.
The entrance of spiral inner tube is arranged on the bottom centre of outer tube colling end, and the outlet of spiral inner tube is located at outer pipe insulationThe bottom of end, cooling medium enters into and reaches outer tube colling end center from tube inlet in spiral through arrival end, by bottomInner tube spiral, to the adiabatic end of outer tube place, then exports through the port of export out from inner tube.
Described even cooler number is one or more, is arranged at crystallizer height and position, evenly at the bottom of coolerPortion is concordant with crystallizer; Described magnetic stirrer is rotary EMS device, travelling-wave electromagnetic agitator or compound electricMagnetic stirrer etc.
Evenly cooler is arranged on semi-continuous casting platform, and in semi-continuous casting process, evenly cooler is set toIn crystallizer, cooling medium enters and arrives even cooler bottom centre from interior tube inlet, then spiral,By bottom Heat Conduction Material and melt heat exchange, thus cooling heart portion melt, and evenly cooling effect of cooler is from bottom sidesBu Dao center strengthens gradually, rotates under coupling, in conjunction with knot in electromagnetic agitation and cooler colling end blade mechanismThe external refrigeration effect of brilliant device to melt, realizes object melt solid, omnibearing cooling heat dissipation.
While preparing the thin brilliant homogeneous aluminium alloy cast ingot of large specification based on said apparatus, by magnetic stirrer be arranged on heat top andCrystallizer periphery, one or more even coolers are arranged on semi-continuous casting platform, in casting process, push up along heatBe deep in crystallizer, from melt inside, melt applied evenly cooling.
Adopt the utility model device to prepare the method for the thin brilliant homogeneous aluminium alloy cast ingot of large specification, concrete processAs follows: in semi-continuous casting process, first by heat top and dummy ingot preheating, to pass through heat through the alloy melt of refining treatmentTop arrives crystallizer, and melt liquid level rises to and requires height, starts continuous casting, dummy ingot slow decreasing, and cooling water flow is slowSlow increasing, treats that casting process enters stable state, and even cooler is deep in crystallizer, applies evenly coolingProcess and electromagnetic agitation processing, make the temperature field of large volume alloy melt and composition field distribution even, obtain large specificationThin brilliant homogeneous aluminium alloy cast ingot.
In semi-continuous casting process, evenly cooler is deep into crystallizer height and position, evenly cooler bottom withCrystallizer is concordant, can arrange one or more. The rotary speed of package unit is 0～300r/min, is preferably50～150r/min。
Evenly the cooling medium in cooler is air, nitrogen, argon gas, water, the various fluids of wet goods, cooling mediumFlow is 0～2000L/min, and liquid cooling medium flow is preferably 10～50L/min, gas cooling medium flowBe preferably 500～1000L/min.
Even cooling processing in semi-continuous casting process be arrange in ingot casting preparation process one or more evenly coldBut device; Electromagnetic agitation is treated to rotary EMS, travelling-wave electromagnetic stirring or composite electromagnetic stirring etc.
The alloy melt of Semi-continuous Casting process applies even cooling processing, and intensity of cooling is 500～5000W/ (m2·k)，The alloy melt of Semi-continuous Casting process applies electromagnetic agitation processing, and the shear rate of melt is 10～2000s-1, untilCasting process finishes.
Evenly cooler is arranged on semi-continuous casting platform, is deep in crystallizer, in melt in casting processPortion applies evenly cooling to melt; Evenly cooler is made up of outer tube and inner tube. Inner tube is used Heat Conduction Material to make,Cooling medium enters from interior tube inlet, reaches even cooling outer tube colling end, through the rotating inner tube of bottom plate, coolingMedium is by colling end and melt heat exchange, and cold fuse-element, then flows out from inner tube outlet. Outer tube colling end is with leafSheet, blade force melt flows downward, and melt is constantly added to downwards in the middle of liquid cave, plays dynamically continuously allEven cooling effect.
The preparation facilities of the thin brilliant homogeneous aluminium alloy cast ingot of large specification of the present utility model is established on semi-continuous casting platformPut cooler and magnetic stirrer, make ingot casting in semi-continuous casting process, be subject to evenly cooling and electromagnetic agitation placeReason, improves the uniformity of He Cheng branch, alloy graining process temperature field.
Said apparatus and method are used in prepares the aluminum alloy round that diameter is greater than 300mm in semi-continuous casting equipmentIngot and thickness are greater than the aluminium alloy flat bloom of 300mm.
Novelty of the present utility model and technological progress are mainly reflected in:
1, compare traditional semi-continuous casting method, the utility model is at inner even cooler, the energy placed of crystallizerEffectively take away Metal Melting body-centered portion heat, in conjunction with the external refrigeration effect of crystallizer, creatively changed traditional companyIn casting process, only have the mode that one direction is conducted heat from outside to inside, increased the cooling dimension in process of setting, realizedVarious dimensions compelling, equal-freezing pattern. Therefore, casting speed improves, and liquid point depth shoals, and solidified structure is tiny allEven, component segregation significantly reduces, and hot cracking tendency diminishes, and production efficiency also increases substantially.
2, the utility model will apply in crystallizer evenly electromagnetism outside cooling and crystallizer in semi-continuous casting processThe ingenious combination of stir process, by controlling the rotation of even cooler, cooling and surperficial special leaf structureDesign and with the intercoupling effect of electromagnetic agitation, can make whole melt produce three-dimensional forced convertion, in raisingOn the basis of intensity of cooling, significantly improve the uniformity of He Cheng branch, temperature field, fundamentally solve high-alloying highThick inhomogeneous, the gross segregation of strength aluminum alloy ingot structure, problems of crack.
3, the large size ingot-casting crystal grain that prepared by the utility model is tiny, and composition is even, smooth surface, casting speedHurry up, significantly reduce follow-up homogenizing and processing cost, improved production efficiency and lumber recovery. The whole series method simply canOK, implementation result is good, can realize suitability for industrialized production.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model device.
Fig. 2 is even cooler sectional view of the present utility model.
Fig. 3-a and Fig. 3-b are respectively 7055 aluminum alloy casts prepared by the utility model method and common semi-continuous castingIngot microstructure.
Fig. 4 is that the 7055 aluminium alloy cast ingot radial directions that the utility model method is prepared with common semi-continuous casting becomeDistribute.
Main description of reference numerals:
1 cooler 2 heat tops
3 melt 4 crystallizers
5 magnetic stirrer 6 ingot castings
The 7 dummy ingot 8 inner tube ports of export
The adiabatic end of 9 inner tube arrival end 10
11 blade 12 spiral inner tubes
13 colling ends
Detailed description of the invention
The utility model can be implemented according to following instance, but is not limited to this, and these embodiment are just for for exampleBright the utility model implementation process, but not limit by any way scope of the present utility model, at following embodimentIn, various processes and the method do not described in detail are conventional methods as known in the art.
As shown in Figure 1, the preparation facilities of the thin brilliant homogeneous aluminium alloy cast ingot of the large specification of the utility model is mainly by evenly coldBut device 1, heat top 2, magnetic stirrer 5, crystallizer 4, dummy ingot 7 form; Heat top 2 is arranged at crystallizer 4Top, magnetic stirrer 5 is arranged on heat top 2 and crystallizer 4 peripheries, and dummy ingot 7 is positioned at crystallizer 4 belows, allEven cooler 1 is arranged on semi-continuous casting platform, is arranged in crystallizer 4, evenly cooler in casting process1 is made up of inner and outer tubes.
Evenly the top of the outer tube of cooler 1 is adiabatic end 10, and bottom is colling end 13; Inner tube comprises in spiralPipe 12 and be separately positioned on inner tube arrival end 9 and the inner tube port of export 8 of spiral inner tube 12 entrance and exits, spiralInner tube 12 is arranged in the colling end 13 of outer tube in a spiral manner.
Evenly the thermal insulation end 10 of cooler 1 outer tube be cylindrical shape and with bottom colling end 13 smooth excessivenesses, external diameter is100～800mm and be not more than colling end 13 hemisphere external diameters, thickness is 3～20mm, adopts high temperature resistant adiabatic potteryCeramic material is made; Colling end 13 is hemispherical, and half bulb diameter is 100～800mm, thickness and adiabatic end 10 phasesWith, adopt thermostable heat-conductive material to make, as graphite, copper, molybdenum, titanium and composite thereof.
The hemisphere maximum radius place of colling end 13 is provided with blade 11, and the number of blade is 0～8, and blade 11 width are 10～100mm, blade 11 thickness are 2～8mm, blade 11 has the effect of downward drive melt flows while rotation,Drive downwards melt 3 to collect to colling end 13 bottoms, blade 11 adopts exotic material to make, as copper, molybdenum,Titanium, ceramic composite materials.
Inner tube is made up of the good material of thermal conductivity, as copper, steel, titanium and alloy thereof and composite; Inner tube diameterBe 2～30mm, thickness 0.5～5mm, the spiral numerical digit 3～50 of spiral inner tube 12, helix pitch is 0～10mm.The entrance of spiral inner tube 12 is arranged on the bottom centre of outer tube colling end 13, outside the outlet of spiral inner tube 12 is located atThe bottom of pipe insulation end 10, it is cold that cooling medium enters arrival outer tube through inner tube arrival end 9 from spiral inner tube 12 entrancesQue Duan 13 centers,, then export through inner tube from inner tube to the adiabatic end of outer tube 10 places by bottom inner tube spiralThe port of export 8 out.
Evenly cooler 1 number is one or more, is arranged at crystallizer 4 height and positions; Magnetic stirrer 5 isRotary EMS device, travelling-wave electromagnetic agitator or composite electromagnetic agitator etc., agitating mode can be rotating electromagneticStirring, travelling-wave electromagnetic stirring or composite electromagnetic stirring etc.
The method that adopts the utility model device to prepare large-size aluminum alloy ingot is: magnetic stirrer 5 is arranged on heatTop 2 and crystallizer 4 peripheries, one or more even coolers 1 are arranged on semi-continuous casting platform, castIn journey, be deep in crystallizer 4 along heat top, from melt inside, melt 3 applied evenly cooling.
In semi-continuous casting process, first by heat top 2 and dummy ingot 7 preheatings, logical through the alloy melt 3 of refining treatmentOverheated top 2 arrives crystallizer 4, and melt 3 liquid levels rise to and require height, start continuous casting, dummy ingot 7 slow decreasings,Cooling water flow slowly strengthens, and treats that casting process enters stable state, and even cooler 1 is deep into crystallizer 4In, apply even cooling processing and electromagnetic agitation processing, realize equal to He Cheng branch, large volume alloy melt temperature fieldEffective control of even property.
In semi-continuous casting process, evenly cooler is deep into crystallizer height and position, can arrange one or manyIndividual. The rotary speed of package unit is 0～300r/min. Evenly the cooling medium in cooler be air, nitrogen,Argon gas, water, the various fluids of wet goods, cooling medium consumption is 0～2000L/min.
The alloy melt of Semi-continuous Casting process applies even cooling processing, and intensity of cooling is 500～5000W/ (m2·k)，Electromagnetic agitation in semi-continuous casting process is treated to rotary EMS, travelling-wave electromagnetic stirs or composite electromagnetic stirsDeng, the shear rate of melt is 10～2000s-1。
Even cooler 1 of the present utility model is made up of inner and outer tubes, and outer tube upper thermal barrier end 10 uses resistance to heightTemperature heat-insulating material is made, and outer tube bottom coohng end 13 uses thermostable heat-conductive material to make, and inner tube is used heat conduction materialMaterial is made, and cooling medium enters from inner tube arrival end 9, reaches even cooler 1 colling end 13, through bottom plateRotating inner tube, cooling medium by with colling end 13 heat exchange cold fuse-elements 3, then flow out from the inner tube port of export 8,Colling end 13 is with blade 11, and in use procedure, evenly cooler 1 rotates, and drives melt 3 to evenly coolingDevice colling end 13 collects, and by processing ingenious combination with electromagnetic agitation, can realize melt dynamically even excessively cold continuously,Melt is through even cooler bottom coohng, and continuing to flow downward enters mushy zone, liquid cave, realizes the moving continuously of meltState is cooling and pressure feeding evenly, finally prepares the large size ingot-casting of thin brilliant homogeneous.
Embodiment 1
Φ 582mm specification 7055 aluminium alloy cast ingots are prepared by Mou Lv processing enterprise, even to inside ingot structural constituentProperty have strict demand, cross section average grain size to be less than 180 μ m, crystallite dimension deviation require be controlled at 8%In, segregation rate is controlled in 6%.
Adopt the utility model device to produce 7055 aluminium alloy round cast ingot that diameter is 582mm, apparatus structure signalFigure as shown in Figure 1. Cooler 1 is arranged on casting platform, and cooler 1 external diameter is 300mm, cooler 1,Heat top 2 and crystallizer 4 are concentric, and cooler 1 bottom is concordant with the bottom of crystallizer 4. Magnetic stirrer 5 arrangesIn the periphery of crystallizer 4, electromagnetic agitation mode adopts rotary EMS.
Cooler 1 inner tube adopts pure copper standby, and inner tube diameter is 10mm, thickness 1mm, and spiral number is 20, spiral shellRotation distance is 3mm; The adiabatic end 10 of outer tube adopts high temperature resistant insulating ceramic to make, and external diameter is 300mm, and thickness is10mm, colling end 13 diameters in bottom are 350mm, make with graphite, blade 11 numbers are 3, blade 11 widthFor 50mm.
In casting process, treat that melt 3 enters in crystallizer 4, start continuous casting installation for casting, casting enters stable stateThe even cooler 1 of rear unlatching, cooling medium is water, and flow is 10L/min, and rotating speed is 60r/min.
Specific embodiment is as follows:
1. melting: 7055 aluminium alloy ingots are added in intermediate frequency furnace, be aided with nitrogen protection, rapid melting, meltingSpeed is 1200kg/h, and melt 3 temperature reach 750 DEG C, are incubated and stir 15min, after stirring, leaves standstill 10minAfter, remove surface scum, converter refining;
2. refining: melt 3 is transferred in electric resistance holding furnace, applies nitrogen protection, melt 3 temperature are controlled at 730 DEG C.First, add refining agent melt 3 is carried out to refining treatment, insulation leaves standstill 10min, then adds in the middle of Al-ZrAlloy carries out microalloy treatment, and is aided with three-dimensional composite electromagnetic stirring, and mixing time is 10min, last,Again melt 3 is carried out to refining treatment, insulation leaves standstill 10min, and melt 3 temperature are controlled at 720 DEG C, start to waterCasting;
3. semi-continuous casting: first hot top 2 and dummy ingot 7 will fully be preheated to 120 DEG C, and melt 3 is by hot teemingEnter crystallizer 4, in the time that melt 3 liquid levels push up 2 top 30mm apart from heat, start continuous casting installation for casting, casting speed is slowSlowly rise to 1.5mm/s, cooling water flow is increased to 10L/s gradually, and casting enters stable state, applies evenly coolingProcess, intensity of cooling is 1000W/ (m2K), then open electromagnetic agitation, shear rate is at 120s-1, until castingThe process of making finishes.
The 7055 aluminium alloy Φ 582mm that prepare by contrast the utility model device and common semi-continuous casting deviceCircle ingot casting, ingot quality testing result shows: as shown in Fig. 3-a and Fig. 3-b and Fig. 4, in Fig. 4, a represents to adopt7055 aluminium alloy cast ingots of preparing with the utility model device, b represents 7055 aluminium prepared by common semi-continuous castingAlloy cast ingot, the ingot casting fractography that adopts the utility model device to prepare is tiny evenly, and average grain size is152 μ m, crystallite dimension deviation is 6.37%; With common semi-continuous casting comparative analysis, the utility model device systemStandby alloy of ingot element Zn, the uniformity of Mg, Cu all have clear improvement, and the segregation rate of alloy element Zn isThe segregation rate that the segregation rate of 4.38%, Mg is 4.51%, Cu is 5.24%, therefore adopts the utility model device systemStandby ingot casting homogeneity of ingredients improves greatly, meets customer requirement.
Embodiment 2
7050 aluminium alloy flat blooms that specification is 520mm × 1560mm are prepared by Mou Lv processing enterprise, to inside ingot groupKnitting homogeneity of ingredients has strict demand, and average grain size is less than 156 μ m, and crystallite dimension Deviation Control is 6%In, the maximum segregation rate of alloying element is controlled in 6%, surperficial corrugationless, inner flawless.
Adopt the utility model device to produce 7050 aluminium alloy flat blooms of 520mm × 1560mm, apparatus structure signalFigure as shown in Figure 1. Cooler 1 diameter is 200mm, is arranged on casting platform, and 3 coolers are in one lineBe evenly arranged, insert in crystallizer, centre-to-centre spacing is 440mm, and cooler 1 bottom is concordant with the bottom of crystallizer 4.Magnetic stirrer 5 is arranged on the periphery of crystallizer 4, and electromagnetic agitation mode adopts travelling-wave electromagnetic to stir.
Cooler 1 inner tube adopts pure copper standby, and inner tube diameter is 8mm, thickness 1mm, and spiral number is 15, spiral shellRotation distance is 0mm; The adiabatic end 10 of outer tube adopts high temperature resistant insulating ceramic to make, and diameter is 200mm, and thickness is10mm, colling end 13 half bulb diameters in bottom are 300mm, make with high purity graphite, blade 11 numbers are 4, leafSheet 11 width are 50mm.
In casting process, treat that melt 3 enters in crystallizer 4, start continuous casting installation for casting, after casting is stable, open allEven cooler 1 and magnetic stirrer 5, cooling medium is water, and flow is 12L/min, and rotating speed is 60r/min.
Specific embodiment is as follows:
1. melting: 7050 aluminium alloy ingots are added in intermediate frequency furnace, be aided with nitrogen protection, rapid melting, meltingSpeed is 1500kg/h, and melt 3 temperature reach 760 DEG C, are incubated and stir 10min, after stirring, leave standstill after 8min,Remove surface scum, converter refining;
2. refining: melt 3 is transferred in electric resistance holding furnace, applies nitrogen protection, melt 3 temperature are controlled at 740 DEG C.First, add refining agent melt 3 is carried out to refining treatment, insulation leaves standstill 10min, then adds in the middle of Al-ZrAlloy carries out microalloy treatment, and is aided with three-dimensional composite electromagnetic stirring, and mixing time is 10min, last,Again melt 3 is carried out to refining treatment, insulation leaves standstill 10min, and melt 3 temperature are controlled at 730 DEG C, start to waterCasting;
3. semi-continuous casting: first hot top 2 and dummy ingot 7 will fully be preheated to 100 DEG C, and melt 3 pushes up 2 by heatInject crystallizer 4, during apart from Re Ding top 30mm, start continuous casting installation for casting until melt 3 liquid levels, casting speed is slowSlowly rise to 1.2mm/s, cooling water flow is increased to 15L/s gradually, and casting enters stable state, applies evenly coolingProcess, intensity of cooling is 1400W/ (m2K), then open electromagnetic agitation, shear rate is at 100s-1, until castingThe process of making finishes.
Prepare 7050 cast aluminium alloy flat ingots by the utility model device, smooth surface, corrugationless; Through inspectionSurvey: inside ingot flawless, fine microstructures is even, and average grain size is 143 μ m, and crystallite dimension deviation is4.63%; Composition is even, and Zn, Mg and Cu element segregation rate are respectively 3.32%, 3.56% and 4.17%, meetsRequirement.
Organizing of preparing for traditional semi-continuous casting method that large-size aluminum alloy ingot easily occurs is thick, unevenEven, component segregation, the defect problem such as easy to crack, in semi-continuous casting process, the utility model passes through alloyMelt applies in crystallizer the evenly coupling specially treated of the cooling and outer electromagnetic agitation of crystallizer, realizes large volume is closedEffective control of gold Temperature Field in Melt and composition field uniformity, has developed the inside and outside various dimensions of large ingot casting and has forced evenly coolingSolidification model, prepare that even tissue is tiny, the uniform large-size aluminum alloy ingot of composition. The utility model knotStructure is simple, method is feasible, effect is remarkable, production efficiency is high, easily combine with industrial production greatly, Aero-Space,The manufacture such as track traffic, boats and ships field has wide prospects for commercial application.
Claims (10)
1. a preparation facilities for the thin brilliant homogeneous aluminium alloy cast ingot of large specification, is characterized in that: this device is mainly by allEven cooler, Re Ding, magnetic stirrer, crystallizer, dummy ingot composition; Described heat top is arranged at the upper of crystallizerSide, described magnetic stirrer is arranged on heat top and crystallizer periphery, and described dummy ingot is positioned at crystallizer below, instituteThe even cooler of stating is arranged in crystallizer, and described even cooler is made up of inner and outer tubes.
2. the preparation facilities of the thin brilliant homogeneous aluminium alloy cast ingot of large specification according to claim 1, is characterized in that:The top of the outer tube of described even cooler is adiabatic end, and bottom is colling end; Described inner tube comprises in spiralArrival end and the port of export of managing and be separately positioned on spiral inner tube entrance and exit, described spiral inner tube is with spiral sideFormula is arranged in the colling end of outer tube.
3. the preparation facilities of the thin brilliant homogeneous aluminium alloy cast ingot of large specification according to claim 2, is characterized in that:The colling end of described even cooler outer tube is hemispherical, adopts thermostable heat-conductive material to make; Described thermal insulationEnd for cylindrical shape and with colling end smooth excessiveness, thickness is identical with colling end, external diameter is not more than colling end hemisphere external diameter,Adopt high temperature resistant insulating ceramic material to make.
4. the preparation facilities of the thin brilliant homogeneous aluminium alloy cast ingot of large specification according to claim 3, is characterized in that:The thermal insulation end external diameter of described even cooler outer tube is 100～800mm, and thickness is 3～20mm; Described is coldBut holding external diameter is 100～800mm, adopts graphite, copper, molybdenum, titanium or its composite to make.
5. the preparation facilities of the thin brilliant homogeneous aluminium alloy cast ingot of large specification according to claim 4, is characterized in that:Described colling end maximum radius place is provided with blade, and the number of blade is 0～8, and width of blade is 10～100mm, leafSheet thickness is 2～8mm, and blade adopts exotic material to make.
6. the preparation facilities of the thin brilliant homogeneous aluminium alloy cast ingot of large specification according to claim 5, is characterized in that:Described blade adopts copper, molybdenum, titanium, pottery or its composite to make.
7. the preparation facilities of the thin brilliant homogeneous aluminium alloy cast ingot of large specification according to claim 2, is characterized in that:Described inner tube is made up of the good material of thermal conductivity, and inner tube diameter is 2～30mm, and thickness is 0.5～5mm,Spiral numerical digit 3～50, helix pitch is 0～10mm.
8. the preparation facilities of the thin brilliant homogeneous aluminium alloy cast ingot of large specification according to claim 7, is characterized in that:Described inner tube is made up of copper, steel, titanium, their alloy or composite.
9. the preparation facilities of the thin brilliant homogeneous aluminium alloy cast ingot of large specification according to claim 1, is characterized in that:Described even cooler is one or more, is arranged at crystallizer height and position; Cooling medium be air, nitrogen,Argon gas, water or oil.
10. the preparation facilities of the thin brilliant homogeneous aluminium alloy cast ingot of large specification according to claim 1, its feature existsIn: described magnetic stirrer is rotary EMS device, travelling-wave electromagnetic agitator or composite electromagnetic agitator.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017113630A1 (en) * | 2015-12-30 | 2017-07-06 | 北京有色金属研究总院 | Device and method for preparing large-sized high-quality aluminium alloy ingot |
| CN106925730A (en) * | 2015-12-30 | 2017-07-07 | 北京有色金属研究总院 | The preparation facilities and method of a kind of big specification fine grain homogeneous aluminium alloy cast ingot |
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2015
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017113630A1 (en) * | 2015-12-30 | 2017-07-06 | 北京有色金属研究总院 | Device and method for preparing large-sized high-quality aluminium alloy ingot |
| CN106925730A (en) * | 2015-12-30 | 2017-07-07 | 北京有色金属研究总院 | The preparation facilities and method of a kind of big specification fine grain homogeneous aluminium alloy cast ingot |
| CN106925730B (en) * | 2015-12-30 | 2019-06-18 | 北京有色金属研究总院 | A kind of preparation facilities and method of big specification fine grain homogeneous aluminium alloy cast ingot |
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