CN104372217B - The hot top casting technique of a kind of 7050 aluminium alloys and aluminium alloy thereof - Google Patents
The hot top casting technique of a kind of 7050 aluminium alloys and aluminium alloy thereof Download PDFInfo
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- CN104372217B CN104372217B CN201410766296.8A CN201410766296A CN104372217B CN 104372217 B CN104372217 B CN 104372217B CN 201410766296 A CN201410766296 A CN 201410766296A CN 104372217 B CN104372217 B CN 104372217B
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Abstract
The present invention provides the hot top casting technique of a kind of 7050 aluminium alloys, comprises the following steps: A) Cu source, Mn source, Mg source, Cr source, Zn source, Ti source, Be source, Zr source and Al source are carried out melting, obtain melting thing；B) by described step A) the melting thing that obtains carries out online degasification, on-line filtration and at line thinning successively, obtains online treatment product；C) by described step B) the online treatment product that obtains casts, and obtains 7050 aluminium alloys；The speed of described casting is 15～25mm/min；Described 7050 aluminium alloys include the component of following mass fraction: 0～the Cu of 2.6%, 0～the Mn of 0.6%, 1.1～the Mg of 3.0%, 0～the Cr element of 0.3%, 4.4～the Zn of 8%, 0～the Ti of 0.06%, the Be of 0 0.0009%, 0～the Zr of 0.25% and the Al of surplus.The present invention provides a kind of 7050 aluminium alloys.
Description
Technical field
The invention belongs to technical field of metal, particularly relate to the hot top founder of a kind of 7050 aluminium alloys
Skill and aluminium alloy thereof.
Background technology
Aluminium alloy is the alloy assembly with aluminum as matrix element, the alloying element mainly included by copper, silicon,
Magnesium, zinc, manganese, also include the alloying elements such as nickel, ferrum, titanium, chromium, lithium.The density of aluminium alloy is low, but
Strength ratio is higher, and near or above high-quality steel, plasticity is good, can be processed into various section bar, has excellent
Electric conductivity, heat conductivity and corrosion stability, be at Aeronautics and Astronautics, automobile, machine-building, boats and ships and chemistry
A most widely used class nonferrous materials in industry, its usage amount is only second to steel.
Generally aluminium alloy more than yield strength 500MPa is referred to as ultrahigh-strength aluminum alloy, they be with
AL-Zn-Mg-Cu system and Al-Zn-Mg system are main heat-treatable strengthened aluminium alloy, from the middle of last century
Since, in order to improve the mechanical property of Al-Zn-Mg line aluminium alloy, and solve in high zinc, high-magnesium aluminum alloy
The serious stress corrosion problem existed, abroad adds the elements such as Cu, Cr, Mn in such aluminium alloy, by
This creates a series of new A L-Zn-Mg-Cu extra super duralumin alloy.Due to it have high specific strength and
Hardness, good hot-workability, excellent welding performance, high fracture toughness, and high anti-stress-corrosion
The advantages such as ability and be widely used in aerospace field, and one of become material important in this field.
But, the flaw detection qualification rate of existing 7050 aluminium alloy conventional cast ingot blanks is relatively low, and only about 80%,
The production cost causing entirety improves.
Summary of the invention
It is an object of the invention to provide hot top casting technique and the aluminium alloy thereof of a kind of 7050 aluminium alloys, this
The flaw detection qualification rate of the casting ingot blank of 7050 aluminium alloys that the hot top casting technique that invention provides manufactures is higher,
97～99% can be reached.
The present invention provides the hot top casting technique of a kind of 7050 aluminium alloys, comprises the following steps:
A) Cu source, Mg source, Zn source, Ti source, Be source, Zr source and Al source are carried out melting,
To melting thing；
B) by described step A) the melting thing that obtains carries out online degasification, on-line filtration and the thinnest successively
Change, obtain online treatment product；
C) by described step B) the online treatment product that obtains casts, and obtains 7050 aluminium alloys；
The speed of described casting is 15～25mm/min；
Described 7050 aluminium alloys include the component of following mass fraction: 2.0～the Cu of 2.6%, 1.9～2.6%
The Zr of the Be of Ti, 0-0.0009% of the Zn of Mg, 5.7～6.7%, 0～0.06%, 0.08～0.15% and remaining
The Al of amount.
Preferably, the temperature of described melting is 800～1050 DEG C.
Preferably, described step A) specifically include following steps:
Cu source, Zn source, Ti source, Zr source and Al source are carried out melting, after melt all melts, adds
Enter 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, described line thinning use Al-5Ti-B silk carry out.
Preferably, the speed of described casting is 18～22mm/min.
Preferably, the temperature of described casting is 730～760 DEG C.
Preferably, the flow cooling down water in described casting process is 14～30m3/h。
Preferably, when the length of described casting is between 0mm～300mm, cold in described casting process
But the flow of water is 14～16m3/h；
As the length ＞ 300mm of described casting, by described casting process cools down the flow of water with
(1m3/h) speed of/50mm increases, until the flow of described cooling water reaches 28～30m3/h.
The present invention also provides for 7050 aluminium alloys that the hot top casting technique as described in technique scheme prepares.
The invention provides the hot top casting technique of a kind of 7050 aluminium alloys, comprise the following steps: A) will
Cu source, Mg source, Zn source, Ti source, Be source, Zr source and Al source carry out melting, obtain melting thing；
B) by described step A) the melting thing that obtains carries out online degasification, on-line filtration and at line thinning successively,
Obtain online treatment product；C) by described step B) the online treatment product that obtains casts, obtains
7050 aluminium alloys；The speed of described casting is 15～25mm/min；Described 7050 aluminium alloys include following
The component of mass fraction: 2.0～the Zn of the Mg of the Cu of 2.6%, 1.9～2.6%, 5.7～6.7%, 0～0.06%
The Zr and the Al of surplus of the Be of Ti, 0-0.0009%, 0.08～0.15%.The hot top casting that the present invention provides
Make technique and have employed relatively low casting speed, to reduce the centre burst tendency of ingot casting, and, ingot casting is also
Do not have Serious Cold every produce transversal crack, improve ingot casting ratio of briquetting, and, the present invention casting
Before alloy is refined, improve inside ingot metallurgical quality, result shows, use the present invention carry
The flaw detection qualification rate of 7050 aluminium alloys that the hot top casting technique of confession obtains 97～99%, ingot casting grain size
It it is I grade.
Detailed description of the invention
The invention provides the hot top casting technique of a kind of 7050 aluminium alloys, comprise the following steps: A) will
Cu source, Mg source, Zn source, Ti source, Be source, Zr source and Al source carry out melting, obtain melting thing；
B) by described step A) the melting thing that obtains carries out online degasification, on-line filtration and at line thinning successively,
Obtain online treatment product；C) by described step B) the online treatment product that obtains casts, obtains
7050 aluminium alloys；The speed of described casting is 15～25mm/min；Described 7050 aluminium alloys include following
The component of mass fraction: 2.0～the Zn of the Mg of the Cu of 2.6%, 1.9～2.6%, 5.7～6.7%, 0～0.06%
The Zr and the Al of surplus of the Be of Ti, 0-0.0009%, 0.08～0.15%.
The flaw detection qualification rate of 7050 aluminium alloys that the hot top casting technique that the present invention provides obtains is higher, it is possible to
Reach 97～99%.
Cu source, Mg source, Zn source, Ti source, Be source, Zr source and Al source are carried out melting by the present invention,
Obtain melting thing；The present invention preferably will carry out described melting in smelting furnace, and the present invention is preferably before shove charge
In described smelting furnace, first it is sprinkled into No. two solvents Cu source, Zn source, Ti source, Zr source and Al source is loaded molten
In furnace, carry out melting, after melt staying of softening is flat, in stove, is sprinkled into No. two solvent powder, treats
State furnace charge all to melt, when melt temperature reaches 720～740 DEG C, the Mg source of addition and 0-0.0009%'s
Be, uses No. two solvent powder to cover after adding, melting after stirring obtains melting thing.
When shove charge, should carry out by order from small to large in principle, will first fill cobbing, refill big
Block, is contained at the middle and upper levels by intermediate alloy high for fusing point simultaneously, and the metal of easy scaling loss is contained in middle level.
In the present invention, described Cu mass fraction in raw material used is 2.0～2.6%, more preferably
2.1～2.5%, most preferably 2.3%；Present invention preferably employs pure Cu plate and carry out described melting, described pure
Mass fraction >=99.95% of Cu in Cu plate.
In the present invention, described Zn mass fraction in raw material used is 5.7～6.7%, is preferably
6.0～6.5%, more preferably 6.2%；Present invention preferably employs pure zinc ingot and carry out described melting, described pure zinc
In ingot, the mass fraction of Zn is preferably >=99.99%.
In the present invention, described Ti mass fraction in raw material used is 0～0.06%, is preferably
0.01～0.03%, most preferably 0.02%；Described Ti can be with crystal grain thinning and prevent ingot casting crackle, this
The bright Al-Ti of preferably employing intermediate alloy carries out described melting, and in described Al-Ti intermediate alloy, the quality of Ti is divided
Number is preferably 3～5%, more preferably 4%.
In the present invention, described Zr mass fraction in raw material used is 0.08～0.15%, is preferably
0.12%；Present invention preferably employs Al-Zr intermediate alloy and carry out described melting, described Al-Zr intermediate alloy
The mass fraction of middle Zr is preferably 3～5%, more preferably 4%.
In the present invention, described Mg mass fraction in raw material used is 1.9～2.6%, is preferably
2.0～2.5%, most preferably 2.3%；Present invention preferably employs pure Mg ingot and carry out described melting, described pure
In Mg ingot, the mass fraction of Mg is preferably >=99.95%.
In the present invention, the mass fraction of described Be is 0-0.0009%
In the present invention, described Al mass fraction in raw material used and the mass fraction of other components
Sum is 100%, present invention preferably employs pure Al ingot and carries out described melting, in described pure Al ingot, and Al
Mass fraction preferably >=99.7%.
In the present invention, described No. two solvent powder are commercially available prod, and each usage amount is preferably above-mentioned former
The 0.5～2% of material total amount, more preferably 1%.
In the present invention, in described fusion process, the fire box temperature of melting is preferably 800～1050 DEG C, more excellent
Electing 900～1000 DEG C as, in described melting, the temperature of melt is preferably 600～770 DEG C, more preferably
650～750 DEG C；The time of described melting is preferably 20～60min, more preferably 30～50min.
After completing described melting, the melt obtained preferably is sampled by the present invention, in order to bath composition
It is analyzed, then carries out corresponding composition adjustment, described adjustment according to the content requirement of above-mentioned each composition
The method that is well known to those skilled in the art of method.Concrete, decide whether to water down according to censorship result
Or feed supplement, waters down or feed supplement is carried out the most as follows:
If producing 7050 aluminium alloy cast ingot length 4200mm, cast 41 time, it is considered to oxidization burning loss 5%,
Ingot casting specification Φ 650, this alloy density is 2800kg/m3, then total inventory=π × 0.652/4 is calculated
× 4.2 × 4 × (1+5%) × 2800 ≈ 17400kg.
As a example by Cu element, if Cu element on-the-spot sample analysis value is 1.9%, 2.2% need to be mended,
Then need to mend Al-Cu intermediate alloy weight=17400 × (2.2%-1.9%)/40% ≈ of content 40%
130kg
If Cu element on-the-spot sample analysis value 2.7%, need to water down to 2.5%,
Then need AL99.70 ingot total amount=17400 × (the 2.7%-2.5%)/1.9% ≈ 180kg watered down.
Before noting feed supplement or watering down, melt temperature should be properly increased to more than 750 DEG C, and the metal added
Or intermediate alloy should be dried, and prevents accidents such as blowing out.
The present invention is preferably sampled at the middle melt of fire door, and uses described No. two solvent powder after sampling
Cover.
After completing composition adjustment, present invention preferably employs refine pipe and carry out argon refine in stove, described refine
Time be preferably 15～30min, more preferably 20min, the temperature of described refine is preferably 730～750
DEG C, more preferably 740 DEG C；During described refine, the height of bubble is not to be exceeded 80mm.
After completing described refine, melt is preferably stood by the present invention, obtains melting thing, described standing
Time preferably >=25min.
After obtaining melting thing, the present invention described melting thing is carried out successively online degasification, on-line filtration and
Line thinning, obtains online treatment product.In the present invention, described online degasification preferably employs birotor and removes
Gas purifier, the flow of described refine gas is preferably 25～35L/min, more preferably 30L/min；
The temperature of described refine is preferably 715～725 DEG C, more preferably 720 DEG C；The rotating speed of described rotor is preferably
290～310rpm, more preferably 295～305rpm.
In the present invention, described on-line filtration preferably employs single-stage 30ppi ceramic filter plate and filters；Institute
State and preferably employ Al-5Ti-B silk at line thinning.
After completing online treatment, the online treatment product obtained is cast by the present invention, obtains 7050 aluminum
Alloy, in the present invention, the speed of described casting is 14～25mm/min, preferably 15～24mm/min；
Because there being the hot top insulation of suitably height, therefore, the present invention can use the lowest casting speed to carry out
Casting, to reduce centre burst tendency, ingot casting does not haves Serious Cold every producing transversal crack yet.Described
The temperature of casting is preferably 730～760 DEG C, more preferably 740～750 DEG C；Described casting process cools down water
Flow be preferably 15～30m3/h.In the present invention, at first, described casting is fast in described casting
Degree is preferably 14～16mm/min, more preferably 15mm/min, and described cooling water flow is preferably
14～16m3/ h, more preferably 15m3/h；After casting length reaches 300mm, by described casting speed
Increase with the speed of (1mm/min)/50mm, until described casting speed reaches 24～26mm/min, more
It is preferably 25mm/min；With (1m3/h)/50mm, (length i.e. cast reaches the flow of described cooling water
After 300mm, casting length often increases 50mm, and discharge increases 1m3/h) speed increase, until
The flow of described cooling water reaches 28～30m3/h.The present invention uses the water-cooling method gradually strengthened, due to
One time water-cooled is more weak, and liquid cave is shallower, it is not easy to produce centre burst ingot casting, and secondary water-cooled is strengthened relatively,
Rate of cooling is greatly improved so that the aluminium alloy cast ingot dense internal organization obtained, and improves ingot casting molding
Rate and internal metallurgical quality.
The present invention preferably cuts off the water when gate part liquid still has 1/3, when gate part crystallizer to be departed from once
Stop, complete described casting.
After completing described casting, the ingot casting obtained preferably is annealed by the present invention, to go de-stress, and institute
The temperature stating annealing is preferably 350～450 DEG C, more preferably 380～420 DEG C；The time of described annealing is preferred
It is 6～10 hours, more preferably 7～9 hours.
After completing annealing, the aluminium alloy cast ingot that described annealing is preferably obtained by the present invention carries out post processing, institute
State post processing to include ingot casting sawing, process and detect, described post processing can according to actual production need into
Row processes, and the present invention does not do special restriction.
Present invention also offers a kind of 7050 aluminium alloys, according to the hot top founder described in technique scheme
Skill prepares.Concrete, the present invention can prepare specification according to the technique described in technique scheme
7050 aluminium alloys for φ 650.In 7050 aluminium alloys, Cu containing 2.3%, the Mg of 2.3%, 6.2%
Zn, the Ti of 0.02%, the Zr of 0.12% and the Al of surplus；
The present invention deforms Al alloys andMg alloys product supersonic testing method to this according to GB/T 6519-2013
Bright 7050 aluminium alloys obtained have carried out carrying out flaw detection, and result shows, 7050 aluminum that the present invention provides close
The flaw detection qualification rate of gold is 97～99%.
The present invention is according to GB/T 3246.1-2000 deformation aluminum and Al-alloy products microscopic structure method of inspection basis
7050 aluminium alloys that invention obtains have carried out grain size detection, and result shows, the 7050 of present invention offer
The grain size of aluminium alloy is I grade.
The invention provides the hot top casting technique of a kind of 7050 aluminium alloys, comprise the following steps: A) will
Cu source, Mg source, Zn source, Ti source, Be source, Zr source and Al source carry out melting, obtain melting thing；
B) by described step A) the melting thing that obtains carries out online degasification, on-line filtration and at line thinning successively,
Obtain online treatment product；C) by described step B) the online treatment product that obtains casts, obtains
7050 aluminium alloys；The speed of described casting is 15～25mm/min；Described 7050 aluminium alloys include following
The component of mass fraction: 2.0～the Zn of the Mg of the Cu of 2.6%, 1.9～2.6%, 5.7～6.7%, 0～0.06%
The Zr and the Al of surplus of the Be of Ti, 0-0.0009%, 0.08～0.15%.The hot top casting that the present invention provides
Make technique and have employed relatively low casting speed, to reduce the centre burst tendency of ingot casting, and, ingot casting is also
Do not have Serious Cold every produce transversal crack, improve ingot casting ratio of briquetting, and, the present invention casting
Before alloy is refined, improve inside ingot metallurgical quality, result shows, use the present invention carry
The flaw detection qualification rate of 7050 aluminium alloys that the hot top casting technique of confession obtains 97～99%, ingot casting grain size
It it is I grade.
Further, since present invention employs the water-cooling method gradually strengthened, one time water-cooled is more weak, and liquid cave is relatively
Shallow, it is not easy to produce centre burst ingot casting, secondary water-cooled is strengthened relatively, and rate of cooling is greatly improved, interior
Dense structure of portion；Achieve same level casting owing to eliminating cursory funnel, greatly reduce oxide-film folder
The macro defects such as slag, light crystalline substance, compound, thus drastically increase hot top casting technique ingot casting of the present invention
Ratio of briquetting and internal metallurgical quality.
According to company's alloy forged piece creation data statistics, southwest aluminum melting and casting line 7050 alloy forged piece billet
Base annual production 3000 tons.If entirely using hot top forging type to produce, the low power such as slag inclusion, light crystalline substance, compound
Metallurgical imperfection waste product will be greatly reduced；At in-line purification when production has oxide-film, loose particular/special requirement goods
Equipment configuration rationally and purifies under technique normal condition, its oxide-film test piece detection qualification rate up to 99% with
On；When producing the particular product having flaw detection to require, flaw detection qualification rate can reach more than 90%.
1, effect is directly created, reduction cost:
Produce A forging A level flaw detection qualification rate 97% by 7050 alloy hot top billets to calculate, use 7050
Alloy hot top billet produces A class A level flaw detection forging many outputs 7050 alloy finished product forging=7050 alloy A
Class A spy hot top Round Billet throws forging yield × (7050 alloy hot top casting A classes A spy forging flaw detection conjunctions
Lattice rate-year 7050 alloy conventional cast A class A spy forging flaw detection qualification rate)
=222.557 tons × (97%-79.44%)=222.557 × 17.56%=39.081 ton
Forge plant 7050 alloy A class A visits forging process cost 1.2 ten thousand yuan/ton, ingot blank finished product raw material
Cost price 14560+5000 yuan/ton, waste product folding cost of raw material valency 12860 yuan/ton, then 7050 alloy Ф
650 billet hot top foundry engieering popularization and application reduce cost, directly wound effect:
The forging of=many outputs × (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, indirect potentiation is made profits
Along with the development of domestic air mail industry, the alloy forged piece market demand is big, and supply falls short of demand, therefore, and 7050
Alloy Ф 650 billet hot top foundry engieering popularization and application, it is contemplated that every year can many output 7050 qualified forgings of alloy
Part=3000 ton × (97%-84.31%)=380.7 ton, add corporate economy's benefit indirectly, and 7050 close
Gold A level flaw detection forging price is by market average price 60,000 yuan/ton calculating, and company's gross profit is by 2.8 ten thousand yuan/ton (not
Eat up part of company management expense) calculate, indirect potentiation make profits into:
=380.7 tons × 2.8 ten thousand yuan/ton=1065.96 ten thousand yuan
3, social benefit
The 7050 of present invention offer are alloy circle ingot casting hot top casting technique, will shorten China further molten
Casting technical elements and the gap of developed country, can promote in the aluminum forging ingot blank founding unit of southwest, promote
Being applied to middle aluminum southwest aluminum circle ingot casting melting and casting line, the high-quality ingot casting produced, it is domestic right to meet
The eager needs of big aircraft materials, being expected to realize aeronautical material 7050 is major part alloy product production domesticization,
Reducing by 7050 is that aeronautical material high price abroad purchases production cost, contributes to strengthening and domestic flies greatly Products
The market competitiveness.
In order to further illustrate the present invention, one 7050 aluminum provided the present invention below in conjunction with embodiment closes
The hot top casting technique of gold is described in detail, but can not be understood as the limit to scope
Fixed.
In the examples below, raw material used meets claimed below:
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 all intermediate alloys, Fe, Si≤0.6%, other≤0.1%.Al-10Fe:Si≤0.6%, its
He≤0.1%.At line thinning: Al-5Ti-B Φ 9.5mm silk.
Auxiliary material used meets claimed below:
Liquid argon: purity >=99.98%, H2O≤10ppm, [H2]≤5ppm, [O2]≤10ppm；2# melts
Agent: technical grade；On-line filtration: 30ppi ceramic filter plate.
Reasonably combined use low ferrum sial ingot and one-level waste material own, high-precision aluminium ingot consumption is answered during alloying ingredient
>=50%, one-level waste material consumption requires≤30%, requires that raw material surface cleaning is clean during dispensing, copper, magnesium,
Zinc element is directly with simple metal dispensing, and other are with intermediate alloy dispensing.
Embodiment 1
Production extrusion ingot length 4200mm, ingot casting specification are 7050 aluminium alloys of Φ 650.1 casting 4
Root, it is considered to oxidization burning loss 5%, this alloy density is 2800kg/m3, then calculate total inventory=π ×
0.652/4 × 4.2 × 4 × (1+5%) × 2800 ≈ 17400kg.
The 2# solvent powder of 40kg uniformly it is sprinkled into, then by pure for 400kg Cu plate, 1079kg in smelting furnace
Pure Zn ingot, 87kgAl-Ti intermediate alloy, 522kgAl-Zr intermediate alloy and 14912kgAL ingot are by from little
Carry out shove charge to big order, will first fill cobbing, refill big block, simultaneously by centre high for fusing point
Alloy is contained at the middle and upper levels, and the metal of easy scaling loss is contained in middle level.The fire box temperature of smelting furnace controls≤1050
DEG C, melt temperature controls at≤770 DEG C, when melt soften stay and change flat after, be uniformly sprinkled in stove
The 2# ground flux 80kg of 174kg, and stir metal in good time.
After furnace charge has all melted, melt temperature reaches to add 400kg Mg ingot and 5.2kg when about 730 DEG C
Al-Be intermediate alloy.Adition process and cover 54kg with 2# ground flux after adding, usage amount is with completely
Cover and be as the criterion.Should thoroughly stir after adding, and temperature be adjusted stable at about 740 DEG C, about mistake
Stokehold sampling is carried out after 20 minutes.
Sampling must be carried out, according to both analysis result and technique scheme at melt in the middle of fire door
In control require carry out composition adjustment.
After composition adjustment completes, refine pipe is used to carry out argon refine in stove, refining time 20 minutes, essence
Refining temperature about 740 DEG C, during refine, bubble height is not to be exceeded 80mm.
Refine should stand after completing, time of repose at least 25 minutes.
Melt after standing uses birotor refinery by de-gassing device to carry out online degasification, and refine gas consumption is
30L/min, refining temperature is 720 ± 5 DEG C, and rotor speed is 300 ± 5rpm；Then single-stage 30ppi is used
Ceramic filter plate carries out on-line filtration, requires to check the integrity of screen plate, and ensure when changing screen plate
Installation puts in place, carefully puts mass, and suitably toasts；Then according to the amount of 1.5kg/t adds
Al-5Ti-B silk, is carried out at line thinning.
After completing online treatment, being cast by melt, casting temperature is 730 DEG C, when casting starts, and casting
Having made vehicle speed is 15mm/min, and cooling water flow is 15m3/ h, length to be cast reach 300mm with
After, by casting speed with the increasing amount adjustment of (1mm/min)/50mm to 25mm/min, by cooling water flow
With (1m3/ h) increasing amount adjustment of/50mm is to 30m3/h。
Cut off the water when gate part liquid still has 1/3 during casting ending, when gate part crystallizer to be departed from once
Stop, forbid water droplet to gate part.
After having cast, anneal 8 hours at 360 DEG C, then ingot casting carried out accordingly sawing,
Sawing gate part and bottom the most about 350mm, obtains 7050 aluminium alloys.
The present invention carries out carrying out flaw detection according to the 7A04 aluminium alloy that the present invention is obtained by technique scheme, knot
Fruit shows, the flaw detection qualification rate of 7050 aluminium alloys that the present embodiment obtains is 99%.
As can be seen from the above embodiments, hot top founder's artistic skill of 7050 line aluminium alloys that the present invention provides
Enough 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 is noted that general for the art
For logical technical staff, under the premise without departing from the principles of the invention, it is also possible to make some improvement and profit
Decorations, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (9)
1. a hot top casting technique for 7050 aluminium alloys, comprises the following steps:
A) Cu source, Mg source, Zn source, Ti source, Be source, Zr source and Al source are carried out melting, obtain melting thing；
B) by described step A) the melting thing that obtains carries out, at line thinning, online degasification and on-line filtration, obtaining online treatment product successively；
C) by described step B) the online treatment product that obtains casts, and obtains 7050 aluminium alloys；The speed of described casting is 15～25mm/min, and the temperature of described casting is 730～760 DEG C；
Described 7050 aluminium alloys include the component of following mass fraction: 2.0～the Zr and the Al of surplus of the Be of Ti, 0-0.0009%, 0.08～0.15% of the Zn of the Mg of the Cu of 2.6%, 1.9～2.6%, 5.7～6.7%, 0～0.06%.
Hot top casting technique the most according to claim 1, it is characterised in that the furnace gas temperature of described melting is 800～1050 DEG C.
Hot top casting technique the most according to claim 1, it is characterised in that described step A) specifically include following steps:
Cu source, Zn source, Ti source, Zr source and Al source are carried out melting, after furnace charge all melts, adds Mg source and Be source, carry out melting, obtain melting thing.
Hot top casting technique the most according to claim 1, it is characterised 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.
Hot top casting technique the most according to claim 1, it is characterised in that described line thinning use Al-5Ti-B silk carry out.
Hot top casting technique the most according to claim 1, it is characterised in that the speed of described casting is 18～22mm/min.
Hot top casting technique the most according to claim 1, it is characterised in that the flow cooling down water in described casting process is 14～30m3/h。
Hot top casting technique the most according to claim 1, it is characterised in that when the length of described casting is between 0mm～300mm, the flow cooling down water in described casting process is 14～16m3/h；
As the length ＞ 300mm of described casting, described casting process will cool down the flow of water with (1m3/ h) speed of/50mm increases, until the flow of described cooling water reaches 28～30m3/h。
9. 7050 aluminium alloys that the hot top casting technique as described in claim 1～8 any one prepares.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410766296.8A CN104372217B (en) | 2014-12-12 | 2014-12-12 | The hot top casting technique of a kind of 7050 aluminium alloys and aluminium alloy thereof |
Applications Claiming Priority (1)
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| CN108118205A (en) * | 2017-12-29 | 2018-06-05 | 西南铝业（集团）有限责任公司 | A kind of thinning method of fining agent and 7050 alloy cast ingots |
| CN114107760B (en) * | 2020-08-26 | 2023-01-20 | 宝山钢铁股份有限公司 | Particle-reinforced 7XXX aluminum alloy thin strip and preparation method thereof |
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| CN102328065B (en) * | 2011-07-20 | 2013-03-13 | 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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