CN105734369A - Hot top casting process for phi 784-mm 7xxx-series superhard aluminum alloy round bar - Google Patents
Hot top casting process for phi 784-mm 7xxx-series superhard aluminum alloy round bar Download PDFInfo
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- CN105734369A CN105734369A CN201610255011.3A CN201610255011A CN105734369A CN 105734369 A CN105734369 A CN 105734369A CN 201610255011 A CN201610255011 A CN 201610255011A CN 105734369 A CN105734369 A CN 105734369A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
Abstract
The invention discloses a hot top casting process for a phi 784-mm 7xxx-series superhard aluminum alloy round bar. The aluminum alloy round bar is composed of, by mass, 0.25% of Si, 0.4% of Fe, 1.55-1.65% of Cu, 0.25% of Mn, 2.55-2.65% of Mg, 0.19-0.25% of Cr, 5.6-5.7% of Zn, 0.15% of Ti, 0.03% of Zr and the balance Al. The manufacturing process comprises the steps of a, material preparation; b, smelting; c, stirring; d, refining; e, slagging-off; f, heat preservation and standing; g, online thinning; h, online degassing; i, filtration; j, casting; k, homogenizing. Through the process, the defects, such as cracks, component segregation, bright grains, thick grains and loose pores, which often appear when a direct condensation casting technology is adopted for large-diameter superhard aluminum alloy are overcome, and by the adoption of hot top casting, the defects of surface segregation tumors, thick coarse-grain layers and the like are overcome.
Description
Technical field
The invention belongs to metal material moulding field, relate to method for casting aluminium alloy, be specifically related to the 7xxx of a kind of φ 784mm
The hot top casting technique of 7 series extra super duralumin alloy pole.
Background technology
7xxx line aluminium alloy have high specific strength and hardness, hot-working character carefully, welding performance excellent, the most corrosion-resistant
The advantages such as performance and higher toughness, are preferably made into the structure material that holding capacity is bigger, be widely used in aerospace industry and
Other civilian industry fields etc..
Although 7xxx line aluminium alloy is better than 6XXX line aluminium alloy in intensity, alloy part tensile strength and yield strength can
Reach more than 400MPa, but tensile strength, yield strength all reach the 7XXX line aluminium alloy of more than 400MPa, through sun
Oxidation rear surface, pole quality is fine and smooth not as 6XXX system wrought aluminium alloy, there is striped, the surface defect such as heterochromatic, beautiful decoration
Spend low.And it is faced with the smeltings such as casting crack, composition segregation, loose pore especially for producing the 7xxx system duralumin, hard alumin ium alloy of major diameter
Gold defect.Domestic many aluminium alloy processing enterprises fall over each other and are mounted with large-tonnage extruder, have put 15000MT into operation
Hydraulic press, Liaoning Zhong Wang group installing the hydraulic press of 22500MT the biggest in the world, the casting rod diameter that this extruder uses
Reach φ 784mm, it is not yet reported that the superhard alloy casting technique of such major diameter in the document announced.So how
Produce the core competitiveness that the major diameter hard alloy that metallurgical quality is high, surface quality is good is each aluminum processing enterprise.
Summary of the invention
In view of this, it is an object of the invention to provide the hot top casting of the 7xxx 7 series extra super duralumin alloy pole of a kind of φ 784mm
Technique, when technique disclosed by the invention solves major diameter extra super duralumin alloy employing directly condensation foundry engieering, often occur splits
The defects such as stricture of vagina, composition segregation, bright crystal, coarse grain, loose pore, and use hot top casting to solve surface segregation
The defects such as tumor, coarse-grain thickness, substantially increase yield rate and production efficiency, reduce casting cost.
For reaching above-mentioned purpose, the invention provides following technical scheme:
The hot top casting technique of 7xxx 7 series extra super duralumin alloy pole, described aluminium alloy pole comprises as follows by mass
Chemical constituent: Si 0.25%；Fe 0.4%；Cu 1.55-1.65%；Mn 0.25%；Mg 2.55-2.65%；Cr0.19-0.25%；
Zn 5.6-5.7%；Ti 0.15%；Zr 0.03%；Al surplus.
Preferably, describedThe hot top casting technique of 7xxx 7 series extra super duralumin alloy pole, its preparation technology include as
Lower step:
A, get the raw materials ready: choose low-iron low-silicon aluminium ingot, alumal, aluminum bronze intermediate alloy ingot, aluminum lead intermediate alloy ingot and magnesium by proportioning
Ingot；
B, melting: other raw materials outside demagging ingot being added smelting furnace and carries out melting, fusion temperature is 750-765 DEG C, treats completely
Melting refinement adds magnesium ingot after skimming；
C, stirring: use magnetic stirrer, it is ensured that in smelting furnace, raw material can rapid melting and homogeneous temperature；
D, refine: refining procedure includes smelting furnace refine and holding furnace refine；
I: smelting furnace refine: using high-purity argon gas is that carrier carries granule sodium-free refining agent and carries out refine, with refining agent and liquation matter
Amount is than meter, and refining agent consumption is 0.7kg/t, refining temperature 740～745 DEG C, and refining time is 22～25min；
Ii: holding furnace refine: use fixed rotary propeller type purifier, this device mainly by graphite bars, graphite rotator, fascinating is
System and flow control system four major part composition, using high-purity argon gas is that carrier carries granule sodium-free refining agent and carries out refine, with
Refining agent and liquation mass ratio meter, refining agent consumption is 0.5kg/t, and refining temperature is 730-740 DEG C, and refining time is 15-20min；
E, skim: remove dross on surface of fusant；
F, insulation stand: melt proceeding to holding furnace and carries out insulation and stand, control holding temperature 720-730 DEG C, the time is
20-30min；
G, at line thinning: in melt add Al-5Ti-1B alloy carry out micronization processes；This fining agent is than general domestic fining agent
Nucleating agent is smaller, is more evenly distributed and the impurity contents such as ferrum silicon are lower；
H, online degasification: the melt of isothermal holding is proceeded to degasification tank, and utilizes argon to remove the foreign gas in melt；
I, filtration: filter progress includes foam ceramic filter and tubular filter:
I: foam ceramic filter: the melt after utilizing foamed ceramic filter plate to filter degasification, controlling melt temperature during filtration is
690-700℃；
Ii: tubular filter: after ceramic filter plate, aluminum liquid carries out depth-type filtration through tubular filter, by the folder of below 5um
Slag clearance can reach more than 95%, further ensures the cleanliness factor of melt；
J, casting: the melt after filtering injects casting mold and obtains aluminium alloy castings, and controlling cast temperature is 675～685 DEG C, cooling
Molding obtains ingot casting pole；
K, homogenizing process: put to homogeneous furnace by ingot casting pole, are incubated 20h under 475 DEG C of temperature conditionss.
Preferably, forming step use of lowering the temperature described in step k is scraped water pond and casting cooling water is scraped off casting rod surface, casting cooling water
The most directly water on casting rod surface, but by scraping the water conservancy diversion water pipe of water pond, cooling water drainage is run out.
Preferably, scrape water pond described in and be positioned at 160mm under crystallizer.
Preferably, casting speed 10～24mm/min in step k casting process, cooling water flow 1200～2000l/min, casting
With oil 0.2～0.4ml/min.
Preferably, step i uses triple-spool degasification tank to carry out online degasification.
Preferred: after insulation stands, to carry out initial refining again and skim.
The beneficial effects of the present invention is:
1, the present invention solves the defect of casting crack: use use scrape water pond, hot top foundry engieering, at line thinning.Due to
7xxx superhard alloy freezing point is low, and cold and hot crack tendence is the highest, if direct water-cooling casting rod surface in casting process, holds very much
Being easily caused casting rod centre burst, especially major diameter pole, surface has solidified but the solidification of heart portion remains a need for the long period, as
It is too big that fruit directly cooling surface easily causes pole internal-external temperature difference gradient, and casting rod ftractures, and can cause security incident time serious.This
Invention use is scraped water pond and casting cooling water is scraped off casting rod surface, and casting cooling water the most directly waters on casting rod surface, but passes through
Cooling water drainage is run out by the water conservancy diversion water pipe scraping water pond.In casting process, casting rod surface temperature is up to 170 DEG C, in casting rod diameter side
Upwards, surface is substantially reduced with the heart portion temperature difference, and casting internal stress correspondingly reduces a lot, successfully solves asking of casting crack
Topic；
2, the present invention solves the defect of component segregation: the casting reasonable selection of parameter, the application of electromagnetic agitating technology, the thinnest
Change technology, the correct selection of follow-up homogenization.Owing to 7xxx superhard alloy alloying element is high, various metallic element alloys are met
Asynchronously solidifying and cause casting rod composition gross segregation, particularly with major diameter casting rod, surfaces externally and internally intensity of cooling is different, composition
Segregation is even more serious.In casting industry, some laboratory best result are segregation 13%@φ 600mm x 7075.The present invention from
The operations such as aluminum liquid melting, insulation standing just take measures, and such as use magnetic stirrer to carry out the alloy of aluminum liquid and interpolation fully
Stirring, farthest uniform alloy；In casting process, rationally select casting parameter, optimally design intensity of cooling
The casting technological parameter that (three's coupling of casting temperature, speed and intensity of cooling) present invention uses is: casting temperature
675～685 DEG C, casting speed 10～24mm/min, cooling water flow 1200～2000l/min；The use of online fining agent makes
Aluminum liquid comes into force in optimum entry-into-force time 3min, reduces the component segregation caused due to coarse grains to greatest extent；Due to aluminum
During rod casting, being the process of chilling, casting rod intracrystalline and crystal ingedient segregation can be relatively big, so the present invention proposes after the casting is completed,
Casting rod is put to homogeneous furnace, high temperature homogenizing annealing, and homogenizing system is 475 DEG C of insulation 20hr, makes casting rod crystal boundary and intracrystalline
Chemical composition is uniform, at utmost reduces the component segregation defect in intracrystalline, region；
3, the present invention solves the defects such as bright crystal, coarse-grain, loose pore: reasonably casting temperature, online refinement technology,
The use of degasification tank, owing to 7xxx superhard alloy freezing point is low, so temperature can not set the highest during casting, is otherwise easy to make
Become leakage aluminum to cause security incident, but temperature is low can cause again casting rod bright crystal, has the casting rod performance of bright crystal can reduce very
Many, especially hard alloy absolutely not allows casting rod to there is bright crystal, so the present invention have selected rational casting temperature
675～685 DEG C, both avoided in casting process and leaked the problem of aluminum and in turn ensure that casting rod does not produce bright crystal；The other of casting rod
The overwhelming majority such as internal flaw such as coarse-grain, loose pore are owing to the high or online thinning effect of casting temperature is bad and aluminum
Liquid cleanliness factor is inadequate, so the present invention is in implementation process, it is ensured that the aluminum water quality of high-cleanness, high, uses Al-5Ti-1B alloy
Fining agent, this fining agent is more smaller than general domestic fining agent nucleating agent, is more evenly distributed and the impurity contents such as ferrum silicon are lower,
There is more preferable grain refining effect, use triple-spool degasification tank to carry out abundant degasification simultaneously, completely solve these internal flaws.
4. the present invention solves surface segregation tumor and the defect of coarse-grain thickness: use is scraped water pond and avoided casting crack, is protecting simultaneously
On the premise of card does not cracks, can be by strengthening intensity of cooling, improving casting speed and set the use of reasonably casting oil
Amount, obtains smooth casting rod surface and relatively thin coarse-grain layer, uses casting speed 10～24mm/min, cool down current in the present invention
Amount 1200～2000l/min, batch oil 0.3ml/min.Casting rod need not railway carriage, yield rate and production efficiency before extrusion
It is greatly improved.
Accompanying drawing explanation
In order to make the purpose of the present invention, technical scheme and beneficial effect clearer, the present invention provides drawings described below:
Fig. 1 represents the 7xxx 7 series extra super duralumin alloy pole process chart of φ 784mm；
Fig. 2 represents produced major diameter pole.
Detailed description of the invention
Below the preferred embodiments of the present invention are described in detail.The experimental technique of unreceipted actual conditions in embodiment is logical
Often according to normal condition or according to the condition proposed by manufacturer.
The 7xxx 7 series extra super duralumin alloy pole technique stream of the φ 784mm that the detailed description of the invention of following example represents with reference to Fig. 1
Cheng Tu；
Embodiment 1
The hot top casting technique of 7xxx 7 series extra super duralumin alloy pole, described aluminium alloy pole comprises as follows by mass
Chemical constituent: Si 0.25%；Fe 0.4%；Cu 1.6%；Mn 0.25%；Mg 2.6%；Cr0.2%；Zn 5.6%；Ti 0.15%；
Zr 0.03%；Al surplus.
Its preparation technology comprises the steps:
A, get the raw materials ready: choose low-iron low-silicon aluminium ingot, alumal, aluminum bronze intermediate alloy ingot, aluminum lead intermediate alloy ingot and magnesium by proportioning
Ingot；
B, melting: other raw materials outside demagging ingot being added smelting furnace and carries out melting, fusion temperature is 760 DEG C, waits to be completely melt
Refine adds magnesium ingot after skimming；
C, stirring: use magnetic stirrer, it is ensured that in smelting furnace, raw material can rapid melting and homogeneous temperature；
D, refine: refining procedure includes smelting furnace refine and holding furnace refine；
I: smelting furnace refine: using high-purity argon gas is that carrier carries granule sodium-free refining agent and carries out refine, with refining agent and liquation matter
Amount is than meter, and refining agent consumption is 0.7kg/t, refining temperature 745 DEG C, controls refining agent and uniformly spray during refine, and in refine
During, operator moves refine dolly so that it is refine each corner in stove all reaches refining effect, and refining time is 22min；
Ii: holding furnace refine: use fixed rotary propeller type purifier, this device mainly by graphite bars, graphite rotator, fascinating is
System and flow control system four major part composition, due to aluminum liquid in smelting furnace the most refined, insulation furnace refining mainly for
During melting & holding furnace aluminum liquid turns water, secondary slag making is polluted and the metal that produces and nonmetal oxide slag inclusion, uses high-purity argon
Gas is that carrier carries granule sodium-free refining agent and carries out refine, and in terms of refining agent with liquation mass ratio, refining agent consumption is 0.5kg/t,
Refining temperature is 730 DEG C, and refining time is 20min, is similarly also required to give good refine to each corner of holding furnace；
E, skim: remove dross on surface of fusant；
F, insulation stand: after composition is qualified, melt proceeds to holding furnace and carries out insulation standing, control holding temperature 730 DEG C,
Time is 20min；
G, at line thinning: in melt add Al-5Ti-1B alloy carry out micronization processes；
H, online degasification: the melt of isothermal holding is proceeded to triple-spool degasification tank and carries out online degasification, and utilize argon to remove melt
In foreign gas；
I, filtration: filter progress includes foam ceramic filter and tubular filter:
I: foam ceramic filter: the melt after utilizing foamed ceramic filter plate to filter degasification, controlling melt temperature during filtration is
690℃；
Ii: tubular filter: after ceramic filter plate, aluminum liquid carries out depth-type filtration through tubular filter, by the folder of below 5um
Slag clearance can reach more than 95%, further ensures the cleanliness factor of melt；
J, casting: the melt after filtering injects casting mold and obtains aluminium alloy castings, and controlling cast temperature is 680 DEG C, molding of lowering the temperature
Obtain ingot casting pole；The use of described cooling forming step is scraped water pond and casting cooling water is scraped off casting rod surface, and casting cooling water is the most direct
Water on casting rod surface, but by scraping the water conservancy diversion water pipe of water pond, cooling water drainage is run out；Casting speed in step k casting process
Degree 10～24mm/min, cooling water flow 1200～2000l/min, casting process uses low discharge during low velocity casting, high
High discharge is used during speed, thus the generation of Crack prevention；Batch oil 0.2～0.4ml/min；Scrape water pond to be positioned under crystallizer
160mm；
K, homogenizing process: put to homogeneous furnace by ingot casting pole, are incubated 20h under 475 DEG C of temperature conditionss.
Embodiment 2
The hot top casting technique of 7xxx 7 series extra super duralumin alloy pole, described aluminium alloy pole comprises as follows by mass
Chemical constituent: Si 0.25%；Fe 0.4%；Cu 1.55%；Mn 0.25%；Mg 2.55%；Cr0.19%；Zn 5.6%；Ti 0.15%；
Zr 0.03%；Al surplus.
Its preparation technology comprises the steps:
A, get the raw materials ready: choose low-iron low-silicon aluminium ingot, alumal, aluminum bronze intermediate alloy ingot, aluminum lead intermediate alloy ingot and magnesium by proportioning
Ingot；
B, melting: other raw materials outside demagging ingot being added smelting furnace and carries out melting, fusion temperature is 755 DEG C, waits to be completely melt
Refine adds magnesium ingot after skimming；
C, stirring: use magnetic stirrer, it is ensured that in smelting furnace, raw material can rapid melting and homogeneous temperature；
D, refine: refining procedure includes smelting furnace refine and holding furnace refine；
I: smelting furnace refine: using high-purity argon gas is that carrier carries granule sodium-free refining agent and carries out refine, with refining agent and liquation matter
Amount is than meter, and refining agent consumption is 0.7kg/t, refining temperature 740 DEG C, controls refining agent and uniformly spray during refine, and in refine
During, operator moves refine dolly so that it is refine each corner in stove all reaches refining effect, and refining time is 25min；
Ii: holding furnace refine: use fixed rotary propeller type purifier, this device mainly by graphite bars, graphite rotator, fascinating is
System and flow control system four major part composition, due to aluminum liquid in smelting furnace the most refined, insulation furnace refining mainly for
During melting & holding furnace aluminum liquid turns water, secondary slag making is polluted and the metal that produces and nonmetal oxide slag inclusion, uses high-purity argon
Gas is that carrier carries granule sodium-free refining agent and carries out refine, and in terms of refining agent with liquation mass ratio, refining agent consumption is 0.5kg/t,
Refining temperature is 730 DEG C, and refining time is 20min, is similarly also required to give good refine to each corner of holding furnace；
E, skim: remove dross on surface of fusant；
F, insulation stand: after composition is qualified, melt proceeds to holding furnace and carries out insulation standing, control holding temperature 730 DEG C,
Time is 20min；After insulation stands, carry out initial refining again and skim；
G, at line thinning: in melt add Al-5Ti-1B alloy carry out micronization processes；
H, online degasification: the melt of isothermal holding is proceeded to triple-spool degasification tank and carries out online degasification, and utilize argon to remove melt
In foreign gas；
I, filtration: filter progress includes foam ceramic filter and tubular filter:
I: foam ceramic filter: the melt after utilizing foamed ceramic filter plate to filter degasification, controlling melt temperature during filtration is
700℃；
Ii: tubular filter: after ceramic filter plate, aluminum liquid carries out depth-type filtration through tubular filter, by the folder of below 5um
Slag clearance can reach more than 95%, further ensures the cleanliness factor of melt；
J, casting: the melt after filtering injects casting mold and obtains aluminium alloy castings, and controlling cast temperature is 685 DEG C, molding of lowering the temperature
Obtain ingot casting pole；The use of described cooling forming step is scraped water pond and casting cooling water is scraped off casting rod surface, and casting cooling water is the most direct
Water on casting rod surface, but by scraping the water conservancy diversion water pipe of water pond, cooling water drainage is run out；Casting speed in step k casting process
Degree 10～24mm/min, cooling water flow 1200～2000l/min, casting process uses low discharge during low velocity casting, high
High discharge is used during speed, thus the generation of Crack prevention；Batch oil 0.2～0.4ml/min；Scrape water pond to be positioned under crystallizer
160mm；
K, homogenizing process: put to homogeneous furnace by ingot casting pole, are incubated 20h under 475 DEG C of temperature conditionss.
Prepared7xxx 7 series extra super duralumin alloy pole as shown in Figure 2: prepared by embodiment 1 and embodiment 2
Aluminium alloy detect, the aluminium alloy property indices prepared by embodiment 1 and embodiment 2 all meets diameter and is more than
The service index of the aluminium alloy of 700mm, and the defect of casting crack does not the most occur, the Segregation of Chemical Composition of gained bar
The lowest, diametrically, edge to heart portion, Zn maximum deviation only has 0.002%；Coarse-grain layer thickness is far below conventional cast
The defects such as loose, pore, slag inclusion are not had inside the thickness of method, and casting rod.
Finally illustrating, preferred embodiment above is only in order to illustrate technical scheme and unrestricted, although by above-mentioned
The present invention is described in detail by preferred embodiment, it is to be understood by those skilled in the art that can in form and
In details, it is made various change, without departing from claims of the present invention limited range.
Claims (7)
1.The hot top casting technique of 7xxx 7 series extra super duralumin alloy pole, it is characterised in that: described aluminium alloy pole comprises following chemical constituent: Si 0.25% by mass；Fe 0.4%；Cu 1.55-1.65%；Mn 0.25%；Mg 2.55-2.65%；Cr0.19-0.25%；Zn 5.6-5.7%；Ti 0.15%；Zr 0.03%；Al surplus.
The most according to claim 1The hot top casting technique of 7xxx 7 series extra super duralumin alloy pole, it is characterised in that: its preparation technology comprises the steps:
A, get the raw materials ready: choose low-iron low-silicon aluminium ingot, alumal, aluminum bronze intermediate alloy ingot, aluminum lead intermediate alloy ingot and magnesium ingot by proportioning；
B, melting: other raw materials outside demagging ingot being added smelting furnace and carries out melting, fusion temperature is 750-765 DEG C, wait being completely melt after refine is skimmed to add magnesium ingot；
C, stirring: use magnetic stirrer, it is ensured that in smelting furnace, raw material can rapid melting and homogeneous temperature；
D, refine: refining procedure includes smelting furnace refine and holding furnace refine:
I: smelting furnace refine: using high-purity argon gas is that carrier carries granule sodium-free refining agent and carries out refine, and in terms of refining agent with liquation mass ratio, refining agent consumption is 0.7kg/t, refining temperature 740～745 DEG C, and refining time is 22～25min；
Ii: holding furnace refine: use fixed rotary propeller type purifier, this device is mainly made up of graphite bars, graphite rotator, tilting system and flow control system four major part, using high-purity argon gas is that carrier carries granule sodium-free refining agent and carries out refine, in terms of refining agent with liquation mass ratio, refining agent consumption is 0.5kg/t, refining temperature is 730-740 DEG C, and refining time is 15-20min；
E, skim: remove dross on surface of fusant；
F, insulation stand: melt proceeding to holding furnace and carries out insulation standing, control holding temperature 720-730 DEG C, the time is 20-30min；
G, at line thinning: in melt add Al-5Ti-1B alloy carry out micronization processes；
H, online degasification: the melt of isothermal holding is proceeded to degasification tank, and utilizes argon to remove the foreign gas in melt；
I, filtration: filter progress includes foam ceramic filter and tubular filter:
I: foam ceramic filter: the melt after utilizing foamed ceramic filter plate to filter degasification, controls melt temperature and is 690-700 DEG C during filtration；
Ii: tubular filter: after ceramic filter plate, aluminum liquid carries out depth-type filtration through tubular filter, the slag inclusion clearance of below 5um can be reached more than 95%, further ensure the cleanliness factor of melt；
J, casting: the melt after filtering injects casting mold and obtains aluminium alloy castings, and controlling cast temperature is 675～685 DEG C, and cooling molding obtains ingot casting pole；
K, homogenizing process: put to homogeneous furnace by ingot casting pole, are incubated 20h under 475 DEG C of temperature conditionss.
The hot top casting technique of the 7xxx 7 series extra super duralumin alloy pole of φ 784mm the most according to claim 1, it is characterized in that: forming step use of lowering the temperature described in step l is scraped water pond and casting cooling water is scraped off casting rod surface, casting cooling water the most directly waters on casting rod surface, but is run out by cooling water drainage by scraping the water conservancy diversion water pipe of water pond.
The hot top casting technique of the 7xxx 7 series extra super duralumin alloy pole of φ 784mm the most according to claim 3, it is characterised in that scrape water pond described in: and be positioned at 160mm under crystallizer.
The hot top casting technique of the 7xxx 7 series extra super duralumin alloy pole of φ 784mm the most according to claim 1, it is characterised in that: casting speed 10～24mm/min in step l casting process, cooling water flow 1200～2000l/min, batch oil 0.2～0.4ml/min.
The hot top casting technique of the 7xxx 7 series extra super duralumin alloy pole of φ 784mm the most according to claim 1, it is characterised in that step i uses triple-spool degasification tank to carry out online degasification.
The hot top casting technique of the 7xxx 7 series extra super duralumin alloy pole of φ 784mm the most according to claim 1, it is characterised in that: after insulation stands, carry out initial refining again and skim.
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106555087A (en) * | 2016-12-05 | 2017-04-05 | 辽宁忠旺集团有限公司 | A kind of 7 line aluminium alloy melting and casting methods |
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| CN109890536A (en) * | 2016-10-27 | 2019-06-14 | 诺维尔里斯公司 | High-intensitive 7XXX series alloys and its manufacturing method |
| US11590565B2 (en) | 2016-10-27 | 2023-02-28 | Novelis Inc. | Metal casting and rolling line |
| US11692255B2 (en) | 2016-10-27 | 2023-07-04 | Novelis Inc. | High strength 7XXX series aluminum alloys and methods of making the same |
| US11806779B2 (en) | 2016-10-27 | 2023-11-07 | Novelis Inc. | Systems and methods for making thick gauge aluminum alloy articles |
| US11821065B2 (en) | 2016-10-27 | 2023-11-21 | Novelis Inc. | High strength 6XXX series aluminum alloys and methods of making the same |
| US10913107B2 (en) | 2016-10-27 | 2021-02-09 | Novelis Inc. | Metal casting and rolling line |
| CN106555087A (en) * | 2016-12-05 | 2017-04-05 | 辽宁忠旺集团有限公司 | A kind of 7 line aluminium alloy melting and casting methods |
| CN107653388A (en) * | 2017-09-21 | 2018-02-02 | 洛阳麦达斯铝业有限公司 | A kind of casting technique of the aluminum alloy round casting rod of big specification 7005 |
| CN107737898A (en) * | 2017-10-24 | 2018-02-27 | 辽宁忠旺集团有限公司 | A kind of used in aluminium alloy casting fine aluminium liquid feeder current tempering process |
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| CN109055832A (en) * | 2018-07-30 | 2018-12-21 | 赣州铝业股份有限公司 | A kind of high zinc aluminium alloy casting rod and its melting and casting method |
| CN109055834A (en) * | 2018-07-30 | 2018-12-21 | 赣州铝业股份有限公司 | A kind of aluminium alloy cast rod and its melting and casting method of addition scandium and manganese element |
| CN109055833A (en) * | 2018-07-30 | 2018-12-21 | 赣州铝业股份有限公司 | A kind of high zinc aluminium alloy casting rod and its melting and casting method for adding scandium element |
| CN109014090A (en) * | 2018-08-31 | 2018-12-18 | 苏州铭恒金属科技有限公司 | A kind of heat top casting technique of 7 line aluminium alloy pole |
| CN109338185A (en) * | 2018-12-05 | 2019-02-15 | 辽宁忠旺集团有限公司 | A kind of preparation method of high-strength 7 line aluminium alloy profile |
| CN111676403A (en) * | 2020-04-02 | 2020-09-18 | 山东南山铝业股份有限公司 | Large-size 2-series aluminum alloy ingot for civil aircraft and preparation method thereof |
| CN112746190A (en) * | 2020-12-30 | 2021-05-04 | 贵州华科铝材料工程技术研究有限公司 | Melt purification method of high-conductivity aluminum alloy |
| CN113215425A (en) * | 2021-05-07 | 2021-08-06 | 铜陵市大明玛钢有限责任公司 | Impurity removal process for alloy lining plate during production |
| CN113186408A (en) * | 2021-07-02 | 2021-07-30 | 中国航发北京航空材料研究院 | Preparation method of aluminum alloy ingot |
| CN113564395A (en) * | 2021-07-12 | 2021-10-29 | 航桥新材料科技（滨州）有限公司 | Casting method of high-silicon wear-resistant aluminum alloy cast rod, high-silicon wear-resistant aluminum alloy cast rod and heat treatment method of high-silicon wear-resistant aluminum alloy cast rod |
| CN114107752A (en) * | 2021-12-15 | 2022-03-01 | 中铝河南洛阳铝加工有限公司 | high-Cr aluminum alloy plate strip for anodic oxidation and preparation method thereof |
| CN114107752B (en) * | 2021-12-15 | 2022-06-21 | 中铝河南洛阳铝加工有限公司 | high-Cr aluminum alloy plate strip for anodic oxidation and preparation method thereof |
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