CN104384462A - Hot-top casting technology of 7A05 aluminum alloy and aluminum alloy thereof - Google Patents
Hot-top casting technology of 7A05 aluminum alloy and aluminum alloy thereof Download PDFInfo
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Abstract
The invention provides a hot-top casting technology of a 7A05 aluminum alloy. The hot-top casting technology comprises the following steps: (A) smelting an Mn source, an Mg source, a Cr source, a Zn source, a Ti source, a Be source, a Zr source and an Al source to obtain a melt; (B) carrying out online degassing, online filtering and online refining on the melt obtained in the step (A) to obtain an online treatment product; (C) casting the online treatment product obtained in the step (B) to obtain the 7A05 aluminum alloy, wherein the casting speed is 15-25 mm/min; the 7A05 aluminum alloy comprises the following components in percentages by weight: 0.15-0.4% of Mn, 1.1-1.7% of Mg, 0.05-0.15% of Cr element, 4.4-5.0% of Zn, 0.02-0.06% of Ti, 0-0.0009% of Be, 0.1-0.25% of Zr and the balance of Al. The invention provides the 7A05 aluminum alloy.
Description
Technical field
The invention belongs to technical field of metal, particularly relate to a kind of hot direct casting fabrication technique and aluminium alloy thereof of 7A05 aluminium alloy.
Background technology
Aluminium alloy take aluminium as the alloy assembly of matrix element, and the alloying element mainly comprised, by copper, silicon, magnesium, zinc, manganese, also comprises the alloying elements such as nickel, iron, titanium, chromium, lithium.The density of aluminium alloy is low, but strength ratio is higher, close to or exceed high-quality steel, plasticity is good, various section bar can be processed into, have excellent electric conductivity, thermal conductivity and corrosion stability, be a most widely used class nonferrous materials in Aeronautics and Astronautics, automobile, machine-building, boats and ships and chemical industry, its use amount is only second to steel.
The aluminium alloy of usual more than yield strength 500MPa is called as ultrahigh-strength aluminum alloy, they are main heat-treatable strengthened aluminium alloy with AL-Zn-Mg-Cu system and Al-Zn-Mg, since the middle of last century, in order to improve the mechanical property of Al-Zn-Mg line aluminium alloy, and solve the serious stress corrosion problem existed in high zinc, high-magnesium aluminum alloy, in such aluminium alloy, add the elements such as Cu, Cr, Mn abroad, thereby produce a series of new A L-Zn-Mg-Cu extra super duralumin alloy.Because it has high specific strength and hardness, good hot-workability, excellent welding performance, high fracture toughness, and the advantage such as high anti-stress-corrosion ability and be widely used in aerospace field, and become one of material important in this field.
But the flaw detection qualification rate of existing 7A05 aluminium alloy conventional cast ingot blank is lower, is only about 80%, overall production cost is caused to improve.
Summary of the invention
The object of the present invention is to provide a kind of hot direct casting fabrication technique and aluminium alloy thereof of 7A05 aluminium alloy, the flaw detection qualification rate of the casting ingot blank of the 7A05 aluminium alloy that hot direct casting fabrication technique provided by the invention manufactures is higher, can reach 97 ~ 99%.
The invention provides a kind of hot direct casting fabrication technique of 7A05 aluminium alloy, comprise the following steps:
A) melting is carried out in Mn source, Mg source, Cr source, Zn source, Ti source, Be source, Zr source and Al source, obtain melting thing;
B) by described steps A) the melting thing that obtains carries out online degasification, on-line filtration and at line thinning successively, processed product online;
C) by described step B) the online process product that obtains casts, and obtains 7A05 aluminium alloy; The speed of described casting is 15 ~ 25mm/min;
Described 7A05 aluminium alloy comprises the component of following mass fraction: the Mn of 0.15 ~ 0.4%, the Mg of 1.1 ~ 1.7%, the Cr element of 0.05 ~ 0.15%, the Zn of 4.4 ~ 5.0%, the Be of Ti, 0-0.0009%, the Zr of 0.1 ~ 0.25% of 0.02 ~ 0.06% and the Al of surplus.
Preferably, the temperature of described melting is 800 ~ 1050 DEG C.
Preferably, described steps A) specifically comprise the following steps:
Melting is carried out in Mn source, Cr source, Zn source, Ti source, Zr source and Al source, after melt all melts, adds Mg source and Be source, carry out melting, obtain melting thing.
Preferably, the temperature of described online degasification is 715 ~ 725 DEG C;
The gas flow rate of described online degasification is 25 ~ 35L/min.
Preferably, describedly Al-5Ti-B silk is adopted to carry out at line thinning.
Preferably, the speed of described casting is 18 ~ 22mm/min.
Preferably, the temperature of described casting is 730 ~ 760 DEG C.
Preferably, in described casting process, the flow of cooling water is 14 ~ 30m
3/ h.
Preferably, when the length of described casting is between 0mm ~ 300mm, in described casting process, the flow of cooling water is 14 ~ 16m
3/ h;
As the length > 300mm of described casting, the flow of cooling water in described casting process is increased, until the flow of described cooling water reaches 28 ~ 30m3/h with the speed of (1m3/h)/50mm.
The 7A05 aluminium alloy that the present invention also provides the hot direct casting fabrication technique as described in technique scheme obtained.
The invention provides a kind of hot direct casting fabrication technique of 7A05 aluminium alloy, comprise the following steps: A) melting is carried out in Mn source, Mg source, Cr source, Zn source, Ti source, Be source, Zr source and Al source, obtain melting thing; B) by described steps A) the melting thing that obtains carries out online degasification, on-line filtration and at line thinning successively, processed product online; C) by described step B) the online process product that obtains casts, and obtains 7A05 aluminium alloy; The speed of described casting is 15 ~ 25mm/min; Described 7A05 aluminium alloy comprises the component of following mass fraction: the Mn of 0.15 ~ 0.4%, the Mg of 1.1 ~ 1.7%, the Cr element of 0.05 ~ 0.15%, the Zn of 4.4 ~ 5.0%, the Be of Ti, 0-0.0009%, the Zr of 0.1 ~ 0.25% of 0.02 ~ 0.06% and the Al of surplus.Hot direct casting fabrication technique provided by the invention have employed lower casting speed, to reduce the centre burst tendency of ingot casting, and ingot casting also there will not be Serious Cold every generation transversal crack, improves ingot casting ratio of briquetting, and, the present invention before casting alloy has carried out refinement, and improve inside ingot metallurgical quality, result shows, the flaw detection qualification rate of the 7A05 aluminium alloy adopting hot direct casting fabrication technique provided by the invention to obtain is 97 ~ 99%, and ingot casting grain size is I grade.
Detailed description of the invention
The invention provides a kind of hot direct casting fabrication technique of 7A05 aluminium alloy, comprise the following steps: A) melting is carried out in Mn source, Mg source, Cr source, Zn source, Ti source, Be source, Zr source and Al source, obtain melting thing; B) by described steps A) the melting thing that obtains carries out online degasification, on-line filtration and at line thinning successively, processed product online; C) by described step B) the online process product that obtains casts, and obtains 7A05 aluminium alloy; The speed of described casting is 15 ~ 25mm/min; Described 7A05 aluminium alloy comprises the component of following mass fraction: the Mn of 0.15 ~ 0.4%, the Mg of 1.1 ~ 1.7%, the Cr element of 0.05 ~ 0.15%, the Zn of 4.4 ~ 5.0%, the Be of Ti, 0-0.0009%, the Zr of 0.1 ~ 0.25% of 0.02 ~ 0.06% and the Al of surplus.
The flaw detection qualification rate of the 7A05 aluminium alloy that hot direct casting fabrication technique provided by the invention obtains is higher, can reach 97 ~ 99%.
Melting is carried out in Mn source, Mg source, Cr source, Zn source, Ti source, Be source, Zr source and Al source by the present invention, obtains melting thing; The present invention preferably will carry out described melting in smelting furnace, the present invention is preferably first sprinkled into No. two solvents by Cu source before shove charge in described smelting furnace, Mn source, Cr source, Zn source, Ti source, Zr source and Al source load in smelting furnace, carry out melting, after softening the staying of melt is flat, in stove, be sprinkled into No. two solvent powder, treat that above-mentioned furnace charge all melts, when melt temperature reaches 720 ~ 740 DEG C, the Mg source added and the Be of 0-0.0009%, add rear employing No. two solvent powder and cover, melting after stirring, obtains melting thing.
When shove charge, should be undertaken in principle by order from small to large, be about to first fill cobbing, refill bulk material, be contained at the middle and upper levels simultaneously by intermediate alloy high for fusing point, the metal of easy scaling loss is contained in middle level.
In the present invention, the mass fraction of described Mn in raw material used is 0.15 ~ 0.4%, is more preferably 0.2 ~ 0.3%, most preferably is 0.25%; The present invention preferably adopts Al-Mn intermediate alloy to carry out described melting, and in described Al-Mn intermediate alloy, the mass fraction of Mn is preferably 14 ~ 16%, is more preferably 15%.
In the present invention, the mass fraction of described Cr in raw material used is 0.05 ~ 0.15%, is preferably 0.12%; The present invention preferably adopts Al-Cr intermediate alloy to carry out described melting, and in described Al-Cr intermediate alloy, the mass fraction of Cr is preferably 3 ~ 5%, is more preferably 4%.
In the present invention, the mass fraction of described Zn in raw material used is 4.4 ~ 5.0%, is preferably 4.7%; The present invention preferably adopts pure zinc ingot to carry out described melting, and in described pure zinc ingot, the mass fraction of Zn preferably >=99.99%.
In the present invention, the mass fraction of described Ti in raw material used is 0.02 ~ 0.06%, is preferably 0.03%; Described Ti can crystal grain thinning and prevent ingot casting crackle, and the present invention preferably adopts Al-Ti intermediate alloy to carry out described melting, and in described Al-Ti intermediate alloy, the mass fraction of Ti is preferably 3 ~ 5%, is more preferably 4%.
In the present invention, the mass fraction of described Zr in raw material used is 0.1 ~ 0.25%, is preferably 0.12%; The present invention preferably adopts Al-Zr intermediate alloy to carry out described melting, and in described Al-Zr intermediate alloy, the mass fraction of Zr is preferably 3 ~ 5%, is more preferably 4%.
In the present invention, the mass fraction of described Mg in raw material used is 1.1 ~ 1.7%, is preferably 1.4%; The present invention preferably adopts pure Mg ingot to carry out described melting, and in described pure Mg ingot, the mass fraction of Mg preferably >=99.95%.
In the present invention, the mass fraction of described Be is 0-0.0009%
In the present invention, the mass fraction sum of the mass fraction of described Al in raw material used and other components is 100%, and the present invention preferably adopts pure Al ingot to carry out described melting, and in described pure Al ingot, the mass fraction of Al preferably >=99.7%.
In the present invention, described No. two solvent powder are commercially available prod, and each use amount is preferably 0.5 ~ 2% of above-mentioned raw materials total amount, is more preferably 1%.
In the present invention, in described fusion process, the fire box temperature of melting is preferably 800 ~ 1050 DEG C, is more preferably 900 ~ 1000 DEG C, and in described melting, the temperature of melt is preferably 600 ~ 770 DEG C, is more preferably 650 ~ 750 DEG C; The time of described melting is preferably 20 ~ 60min, is more preferably 30 ~ 50min.
After completing described melting, the present invention preferably samples the melt obtained, to analyze bath composition, then carries out corresponding composition adjustment according to the content requirement of above-mentioned each composition, and the method for described adjustment is method well known to those skilled in the art.Concrete, determine whether water down or feed supplement according to censorship result, to water down or feed supplement is carried out according to quantity as follows:
If produce 7A05 aluminium alloy cast ingot length 4200mm, 1 casting 4, consider oxidization burning loss 5%, ingot casting specification Φ 650, this alloy density is 2800kg/m
3, then total inventory=π × 0.652/4 × 4.2 × 4 × (1+5%) × 2800 ≈ 17400kg is calculated.
For Mn element, if Mn element on-the-spot sample analysis value is 0.14%, need 0.20% be mended,
Then need Al-Mn intermediate alloy weight=17400 × (the 0.20%-0.14%)/15% ≈ 70kg mending content 15%
If Mn element on-the-spot sample analysis value 0.42%, need water down to 0.38%,
Then need AL99.70 ingot total amount=17400 × (the 0.42%-0.38%)/0.38% ≈ 1830kg watered down.
Note feed supplement or before watering down, suitably should improve more than melt temperature to 750 DEG C, and the metal added or intermediate alloy should be dry, prevent accidents such as blowing out.
The present invention preferably samples at the middle melt of fire door, and adopts described No. two solvent powder to cover after sampling.
After completing composition adjustment, the present invention preferably adopts refining pipe to carry out argon gas refining in stove, and the time of described refining is preferably 15 ~ 30min, is more preferably 20min, and the temperature of described refining is preferably 730 ~ 750 DEG C, is more preferably 740 DEG C; During described refining, the height of bubble should not more than 80mm.
After completing described refining, melt preferably leaves standstill by the present invention, obtains melting thing, the described standing time preferably >=25min.
After obtaining melting thing, described melting thing is carried out online degasification, on-line filtration and at line thinning by the present invention successively, is processed product online.In the present invention, described online degasification preferably adopts birotor refinery by de-gassing device, and the flow of described refining gas is preferably 25 ~ 35L/min, is more preferably 30L/min; The temperature of described refining is preferably 715 ~ 725 DEG C, is more preferably 720 DEG C; The rotating speed of described rotor is preferably 290 ~ 310rpm, is more preferably 295 ~ 305rpm.
In the present invention, described on-line filtration preferably adopts single-stage 30ppi ceramic filter plate to filter; Describedly preferably adopt Al-5Ti-B silk at line thinning.
After completing online process, the online process product obtained is cast by the present invention, obtains 7A05 aluminium alloy, and in the present invention, the speed of described casting is 14 ~ 25mm/min, is preferably 15 ~ 24mm/min; Because there is the hot top insulation of suitably height, therefore, the present invention can adopt very low casting speed to cast, and to reduce centre burst tendency, ingot casting also there will not be Serious Cold every generation transversal crack.The temperature of described casting is preferably 730 ~ 760 DEG C, is more preferably 740 ~ 750 DEG C; In described casting process, the flow of cooling water is preferably 15 ~ 30m
3/ h.In the present invention, at first, described casting speed is preferably 14 ~ 16mm/min, is more preferably 15mm/min in described casting, and described cooling water flow is preferably 14 ~ 16m
3/ h, is more preferably 15m
3/ h; After casting length reaches 300mm, described casting speed is increased with the speed of (1mm/min)/50mm, until described casting speed reaches 24 ~ 26mm/min, is more preferably 25mm/min; The flow of described cooling water increases with the speed of (1m3/h)/50mm, and (after the length of namely casting reaches 300mm, casting length often increases 50mm, and discharge increases 1m
3/ h) until the flow of described cooling water reaches 28 ~ 30m
3/ h.The present invention adopts the water-cooling method strengthened gradually, and due to one time, water-cooled is more weak, and liquid cave is more shallow, be not easy to produce centre burst ingot casting, secondary water-cooled is strengthened relatively, and cooling velocity improves greatly, make the aluminium alloy cast ingot dense internal organization obtained, improve ingot casting ratio of briquetting and internal metallurgical quality.
The present invention preferably still has when 1/3 at gate part liquid and cuts off the water, and stops, complete described casting when gate part will depart from crystallizer at once.
After completing described casting, the present invention preferably anneals to the ingot casting obtained, and to remove stress, the temperature of described annealing is preferably 350 ~ 450 DEG C, is more preferably 380 ~ 420 DEG C; The time of described annealing is preferably 6 ~ 10 hours, is more preferably 7 ~ 9 hours.
After completing annealing, the present invention preferably carries out post processing to the aluminium alloy cast ingot that described annealing obtains, and described post processing comprises ingot casting sawing, processing and detection, and described post processing can process according to the need of production of reality, and the present invention does not do special restriction.
Present invention also offers a kind of 7A05 aluminium alloy, prepare according to the hot direct casting fabrication technique described in technique scheme.Concrete, the present invention can prepare the 7A05 aluminium alloy that specification is φ 650 according to the technique described in technique scheme.
The present invention is out of shape Al alloys andMg alloys product supersonic testing method according to GB/T 6519-2013 and has carried out carrying out flaw detection to the 7A05 aluminium alloy that the present invention obtains, and result shows, the flaw detection qualification rate of 7A05 aluminium alloy provided by the invention is 97 ~ 99%.
The 7A05 aluminium alloy that the present invention obtains according to the present invention of the GB/T 3246.1-2000 distortion Al and Alalloy goods microscopic structure method of inspection has carried out grain size detection, and result shows, the grain size of 7A05 aluminium alloy provided by the invention is I grade.
The invention provides a kind of hot direct casting fabrication technique of 7A05 aluminium alloy, comprise the following steps: A) melting is carried out in Mn source, Mg source, Cr source, Zn source, Ti source, Be source, Zr source and Al source, obtain melting thing; B) by described steps A) the melting thing that obtains carries out online degasification, on-line filtration and at line thinning successively, processed product online; C) by described step B) the online process product that obtains casts, and obtains 7A05 aluminium alloy; The speed of described casting is 15 ~ 25mm/min; Described 7A05 aluminium alloy comprises the component of following mass fraction: the Cu of 0 ~ 2.6%, the Mn of 0 ~ 0.6%, the Mg of 1.1 ~ 3.0%, the Cr element of 0 ~ 0.3%, the Zn of 4.4 ~ 8%, the Be of Ti, 0-0.0009%, the Zr of 0 ~ 0.25% of 0 ~ 0.06% and the Al of surplus.Hot direct casting fabrication technique provided by the invention have employed lower casting speed, to reduce the centre burst tendency of ingot casting, and ingot casting also there will not be Serious Cold every generation transversal crack, improves ingot casting ratio of briquetting, and, the present invention before casting alloy has carried out refinement, and improve inside ingot metallurgical quality, result shows, the flaw detection qualification rate of the 7A05 aluminium alloy adopting hot direct casting fabrication technique provided by the invention to obtain is 97 ~ 99%, and ingot casting grain size is I grade.
In addition, owing to present invention employs the water-cooling method strengthened gradually, one time water-cooled is more weak, and liquid cave is more shallow, is not easy to produce centre burst ingot casting, and secondary water-cooled is strengthened relatively, and cooling velocity improves greatly, dense internal organization; Achieve same level casting owing to eliminating cursory funnel, greatly reduce the macro defects such as oxide-film slag inclusion, light crystalline substance, compound, thus drastically increase the present invention's hot direct casting fabrication technique ingot casting ratio of briquetting and internal metallurgical quality.
According to company's alloy forged piece creation data statistics, southwestern aluminium melting and casting line 7A05 alloy forged piece Round Billet annual production 3000 tons.If adopt heat top forging type to produce complete, the low power metallurgical imperfection waste products such as slag inclusion, light crystalline substance, compound will greatly reduce; When production has oxide-film, loose particular/special requirement goods at in-line purification Equipments Setting rationally and under process for purifying normal condition, its oxide-film test piece detects qualification rate can reach more than 99%; Produce flaw detection qualification rate when having the particular product of flaw detection requirement and can reach more than 90%.
1, directly create effect, reduce costs:
Produce category-A forging A level flaw detection qualification rate 97% by the hot tip circle ingot of 7A05 alloy to calculate, employing 7A05 alloy hot tip circle ingot production category-A A level flaw detection forging fecund goes out 7A05 alloy finished product forging=7A05 alloy A class A and visits hot tip circle ingot blank throwing forging output × (the hot direct casting of 7A05 alloy is made category-A A and visited forging flaw detection qualification rate-year 7A05 alloy conventional cast category-A A spy forging flaw detection qualification rate)
=222.557 tons × (97%-79.44%)=222.557 × 17.56%=39.081 ton
Forge plant 7A05 alloy A class A visits forging process cost 1.2 ten thousand yuan/ton, ingot blank finished product cost of raw material valency 14560+5000 yuan/ton, waste product folding cost of raw material valency 12860 yuan/ton, then the hot direct casting technology for making of 7A05 alloy Ф 650 billet is applied to reduce costs, directly create effect and is:
The forging that=fecund goes out × (forging processing cost+raw material feed intake cost allowance)
=39.081 tons × (12000+14560+5000-12860) yuan/ton
=730814 yuan of ≈ 730,000 yuan
2, synergy is made profits indirectly
Along with the development of domestic air mail industry, the alloy forged piece market demand is large, supply falls short of demand, therefore, the hot direct casting technology for making of 7A05 alloy Ф 650 billet is applied, estimate to go out qualified forging=3000 of 7A05 alloy ton × (97%-84.31%)=380.7 ton by fecund every year, indirectly add corporate economy's benefit, 7A05 alloy A level flaw detection forging price is by market average price 60,000 yuan/ton calculating, company's gross profit calculates by 2.8 ten thousand yuan/ton (not eating up part of company management's expense), indirect synergy make profits into:
=380.7 tons × 2.8 ten thousand yuan/ton=1065.96 ten thousand yuan
3, social benefit
The hot direct casting fabrication technique of 7A05 system provided by the invention alloy circle ingot casting, by shorten further China in casting technology with the gap of developed country, can promote in southwestern aluminium forging ingot blank founding unit, promote the use of middle aluminium southwest aluminium circle ingot casting melting and casting line, the high-quality ingot casting produced, the domestic eager needs to large aircraft materials will be met, be expected to realize the most of alloy product production domesticization of aeronautical material 7A05 system, reduce 7A05 system aeronautical material high price and purchase production cost abroad, contribute to strengthening and domesticly fly greatly the Products market competitiveness.
In order to further illustrate the present invention, being described in detail below in conjunction with the hot direct casting fabrication technique of embodiment to a kind of 7A05 aluminium alloy provided by the invention, but can not limiting the scope of the present invention being understood as.
In the examples below, raw material used meet following requirement:
Remelted aluminum ingot: Al >=99.7%; Remelting magnesium ingot: Mg >=99.95%; Cathode copper: Cu >=99.95%; Zinc ingot metal: Zn >=99.99%; Intermediate alloy: Al-15Mn, Al-4Cr, Al-4Ti, Al-4Zr, Al-3Be: in above-mentioned alloy, Fe, Si≤0.6%, other≤0.1%.Al-10Fe:Si≤0.6%, other≤0.1%.At line thinning: Al-5Ti-B Φ 9.5mm silk.
Auxiliary material used meet following requirement:
Liquid argon: purity>=99.98%, H
2o≤10ppm, [H
2]≤5ppm, [O
2]≤10ppm; 2# flux: technical grade; On-line filtration: 30ppi ceramic filter plate.
Reasonably combined use low iron sial ingot and one-level waste material own is answered during alloying ingredient, high-precision aluminium ingot consumption >=50%, one-level waste material consumption requires≤30%, requires that raw material surface cleaning is clean during batching, copper, magnesium, Zn-ef ficiency are directly with simple metal batching, and other are prepared burden with intermediate alloy.
Embodiment 1
Production extrusion ingot length 4200mm, ingot casting specification are the 7A05 aluminium alloy of Φ 650.1 casting 4, consider oxidization burning loss 5%, this alloy density is 2800kg/m
3, then total inventory=π × 0.652/4 × 4.2 × 4 × (1+5%) × 2800 ≈ 17400kg is calculated.
The 2# solvent powder of 40kg is evenly sprinkled in smelting furnace, then 290kgAl-Mn intermediate alloy, 522kgAl-Cr intermediate alloy, the pure Zn ingot of 818kg, 131kgAl-Ti intermediate alloy, 522kg Al-Zr intermediate alloy and 14874kgAL ingot are carried out shove charge by order from small to large, be about to first fill cobbing, refill bulk material, be contained at the middle and upper levels by intermediate alloy high for fusing point, the metal of easy scaling loss is contained in middle level simultaneously.The fire box temperature of smelting furnace controls at≤1050 DEG C, and melt temperature controls at≤770 DEG C, when melt is softening stay and change flat after, in stove, be evenly sprinkled into the 2# ground flux of 80kg, and stir metal in good time.
After furnace charge has all melted, when melt temperature reaches about 730 DEG C, add the Al-Be intermediate alloy of 244kg Mg ingot and 5.2kg.Adition process and add rear 40kg2# ground flux cover, use amount is as the criterion to cover completely.Thoroughly should stir after adding, and temperature adjustment is stabilized in about 740 DEG C, after about spending 20 minutes, carry out stokehold sampling.
Sampling must be carried out at melt in the middle of fire door, carries out composition adjustment according to the control overflow in both analysis result and technique scheme.
After composition adjustment completes, adopt refining pipe to carry out argon gas refining in stove, refining time 20 minutes, refining temperature about 740 DEG C, during refining, bubble height should not more than 80mm.
Should leave standstill after refining completes, time of repose at least 25 minutes.
Adopt birotor refinery by de-gassing device to carry out online degasification the melt after leaving standstill, refining gas consumption is 30L/min, and refining temperature is 720 ± 5 DEG C, and rotor speed is 300 ± 5rpm; Then adopt single-stage 30ppi ceramic filter plate to carry out on-line filtration, when changing filter, require the integrality of checked filter plate, and ensure to be in place, carefully put mass, and suitably toast; Then add Al-5Ti-B silk according to the amount of 2.5kg/t, carry out at line thinning.
After completing online process, cast by melt, casting temperature is 750 DEG C, and when casting starts, having cast vehicle speed is 15mm/min, and cooling water flow is 15m
3/ h, after length to be cast reaches 300mm, by casting speed with the increasing amount adjustment of (1mm/min)/50mm to 25mm/min, by cooling water flow with (1m
3/ h) increasing amount adjustment of/50mm is to 30m
3/ h.
Cut off the water when gate part liquid still has when 1/3 during casting ending, stop when gate part will depart from crystallizer at once, forbid water droplet to gate part.
After having cast, anneal 8 hours at 360 DEG C, then carry out sawing accordingly to ingot casting, sawing gate part and bottom all about 350mm, obtains 7A04 aluminium alloy.
The present invention carries out carrying out flaw detection according to technique scheme to the 7A04 aluminium alloy that the present invention obtains, and result shows, the flaw detection qualification rate of the 7A05 aluminium alloy that the present embodiment obtains is 97%.
As can be seen from the above embodiments, the hot direct casting fabrication technique of 7A05 line aluminium alloy provided by the invention can carry heavy alloyed ingot casting ratio of briquetting and flaw detection qualification rate.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a hot direct casting fabrication technique for 7A05 aluminium alloy, comprises the following steps:
A) melting is carried out in Mn source, Mg source, Cr source, Zn source, Ti source, Be source, Zr source and Al source, obtain melting thing;
B) by described steps A) the melting thing that obtains carries out, at line thinning, online degasification and on-line filtration, being processed product online successively;
C) by described step B) the online process product that obtains casts, and obtains 7A05 aluminium alloy; The speed of described casting is 15 ~ 25mm/min;
Described 7A05 aluminium alloy comprises the component of following mass fraction: the Mn of 0.15 ~ 0.4%, the Mg of 1.1 ~ 1.7%, the Cr element of 0.05 ~ 0.15%, the Zn of 4.4 ~ 5.0%, the Be of Ti, 0-0.0009%, the Zr of 0.1 ~ 0.25% of 0.02 ~ 0.06% and the Al of surplus.
2. hot direct casting fabrication technique according to claim 1, is characterized in that, the furnace gas temperature of described melting is 800 ~ 1050 DEG C.
3. hot direct casting fabrication technique according to claim 1, is characterized in that, described steps A) specifically comprise the following steps:
Melting is carried out in Mn source, Cr source, Zn source, Ti source, Zr source and Al source, after furnace charge all melts, adds Mg source and Be source, carry out melting, obtain melting thing.
4. hot direct casting fabrication technique according to claim 1, is characterized in that, the temperature of described online degasification is 715 ~ 725 DEG C;
The gas flow rate of described online degasification is 25 ~ 35L/min.
5. hot direct casting fabrication technique according to claim 1, is characterized in that, describedly adopts Al-5Ti-B silk to carry out at line thinning.
6. hot direct casting fabrication technique according to claim 1, is characterized in that, the speed of described casting is 18 ~ 22mm/min.
7. hot direct casting fabrication technique according to claim 1, is characterized in that, the temperature of described casting is 730 ~ 760 DEG C.
8. hot direct casting fabrication technique according to claim 1, is characterized in that, in described casting process, the flow of cooling water is 14 ~ 30m
3/ h.
9. hot direct casting fabrication technique according to claim 1, is characterized in that, when the length of described casting is between 0mm ~ 300mm, in described casting process, the flow of cooling water is 14 ~ 16m
3/ h;
As the length > 300mm of described casting, by the flow of cooling water in described casting process with (1m
3/ h)/50mm speed increase, until the flow of described cooling water reaches 28 ~ 30m3/h.
10. the 7A05 aluminium alloy that hot direct casting fabrication technique as claimed in any one of claims 1 to 9 wherein is obtained.
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| CN201410766250.6A CN104384462B (en) | 2014-12-12 | 2014-12-12 | The hot top casting technique of a kind of 7A05 aluminium alloy and aluminium alloy thereof |
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| CN201410766250.6A CN104384462B (en) | 2014-12-12 | 2014-12-12 | The hot top casting technique of a kind of 7A05 aluminium alloy and aluminium alloy thereof |
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| CN201410766250.6A Active CN104384462B (en) | 2014-12-12 | 2014-12-12 | The hot top casting technique of a kind of 7A05 aluminium alloy and aluminium alloy thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113528866A (en) * | 2021-06-16 | 2021-10-22 | 天津忠旺铝业有限公司 | Preparation method of high-strength corrosion-resistant 7xxx aluminum alloy plate for aviation |
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| JPS57127553A (en) * | 1981-01-30 | 1982-08-07 | Sumitomo Light Metal Ind Ltd | Hot top continuous casting method for aluminum |
| JP2010012470A (en) * | 2008-06-30 | 2010-01-21 | Nippon Light Metal Co Ltd | CASTING METHOD OF HYPER-EUTECTIC Al-Si BASED ALLOY, AND INGOT THEREOF |
| CN102328065A (en) * | 2011-07-20 | 2012-01-25 | 辽宁忠旺集团有限公司 | Hot-top casting process of 7075 aluminium alloy round rod with diameter of phi582 mm |
| CN102965553A (en) * | 2012-12-11 | 2013-03-13 | 丛林集团有限公司 | Aluminum alloy cast ingot for automotive bumper and production process thereof |
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| JPS57127553A (en) * | 1981-01-30 | 1982-08-07 | Sumitomo Light Metal Ind Ltd | Hot top continuous casting method for aluminum |
| JP2010012470A (en) * | 2008-06-30 | 2010-01-21 | Nippon Light Metal Co Ltd | CASTING METHOD OF HYPER-EUTECTIC Al-Si BASED ALLOY, AND INGOT THEREOF |
| CN102328065A (en) * | 2011-07-20 | 2012-01-25 | 辽宁忠旺集团有限公司 | Hot-top casting process of 7075 aluminium alloy round rod with diameter of phi582 mm |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113528866A (en) * | 2021-06-16 | 2021-10-22 | 天津忠旺铝业有限公司 | Preparation method of high-strength corrosion-resistant 7xxx aluminum alloy plate for aviation |
| CN113528866B (en) * | 2021-06-16 | 2022-05-20 | 天津忠旺铝业有限公司 | Preparation method of high-strength corrosion-resistant 7xxx aluminum alloy plate for aviation |
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