CN107653388A - A kind of casting technique of the aluminum alloy round casting rod of big specification 7005 - Google Patents
A kind of casting technique of the aluminum alloy round casting rod of big specification 7005 Download PDFInfo
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- CN107653388A CN107653388A CN201710861033.9A CN201710861033A CN107653388A CN 107653388 A CN107653388 A CN 107653388A CN 201710861033 A CN201710861033 A CN 201710861033A CN 107653388 A CN107653388 A CN 107653388A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/002—Castings of light metals
- B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Continuous Casting (AREA)
Abstract
The invention provides a kind of casting technique of the big aluminum alloy round casting rod of specification 7005, is specially：Feed intake, sample, dispensing, stove, refining, standing, online degasification, on-line filtration, casting, tempering.It is alloy one-level waste material feeding intake the raw material 100% used in link as non-7；Gas-solid refining agent (N is used in refining procedure2Nitrogen+4AB sodium-free refining agents)；Without using pulse water installations, dummy bar head is without fine aluminium shop fixtures and without Wiper blade equipment；Grain refiner AlTi is used in crystal grain refinement link5B1Substitute AlTi5B0.2, casting crack caused by B content introduces is avoided on the premise of online refinement Ti contents lifting 0.015%, and reduce cost.Gained casting rod macrostructure of the invention is fine and closely woven, no coarse grain ring, no surface porosity layer and other tissue defects.On the premise of not possessing required casting frock and raw and auxiliary material, using existence conditions, casting cost is reduced, significantly improves economic benefit.
Description
Technical field
The present invention relates to aluminium alloy casting field, the casting of especially a kind of big aluminum alloy round casting rods of specification 7005 of Φ 458mm
Make technique.
Background technology
The weldabilities of 7005 aluminium alloys is relatively good, tensile strength is high, be commonly used to manufacture to intensity and fracture toughness requirement compared with
High welding structure, such as cycle frame.
According to the current condition of production of company, it is necessary to which a diameter of Φ 458mm aluminium alloy cast rod of big specification 7005 is 75MN
Extruder is fed.It is used when domestic enterprise produces the alloy casting rod at present with reference to 7005 current aluminium alloy foundry engieerings
Raw material need to typically add the one-level waste material of 30% similar alloy except fine aluminium, add the one-level waste material of proper proportion similar alloy,
While cost of material raising alloy plasticity is reduced, the probability that 100% waste material input causes dispensing failure is exempted from.
Current casting technique needs argon gas or chlorine to be refined as refining agent in link is refined, but argon gas cost
Height, and chlorine is poisonous, limits both uses；In casting process, traditional 7 are both needed to use Wiper blade when being alloy casting
Intensity of cooling during reducing casting needs to prevent ingot casting afterbody crackle with fine aluminium shop fixtures to control ingot casting to ftracture, before casting；
With pulse water installations to reduce direct water-cooling intensity, to reduce ingot casting bottom crimp, add equipment investment and intermediate alloy is adopted
Purchase expense；Grain refiner AlTi is needed to use in crystal grain refinement link5B0.2To prevent casting crack, but in higher B content
When be still unavoidable from the appearance of casting crack.
Existing casting technique tedious process, it is with high costs, limit the batch production of 7005 aluminium alloys.
The content of the invention
It is an object of the invention to overcome the above difficult, there is provided a kind of Eco-power big aluminium alloys of specification 7005 of Φ 458mm
The casting technique of circle casting rod, the macrostructure of the aluminium alloy cast rod of gained 7005 is fine and closely woven, no coarse grain ring, no visible surface weaker zone,
Without other tissue defects.Without using pulse water installations；Dummy bar head reduces equipment without fine aluminium shop fixtures and without Wiper blade equipment
Investment and operating cost；Grain refiner AlTi is used in crystal grain refinement link5B1Substitute AlTi5B0.2, online refinement Ti contents
Casting crack caused by B content introduces is effectively prevent on the premise of lifting 0.015%.Can not possess required founder
On the premise of dress and raw and auxiliary material, make full use of existence conditions to be cast, substantially reduce casting cost and reduce intermediate alloy
And frock using and purchases.
The object of the invention to solve the technical problems is realized using following technical scheme.Itd is proposed according to the present invention
A kind of big aluminum alloy round casting rod of specification 7005 casting technique, comprise the following steps：
1) feed intake：By 100% non-7, to be alloy one-level waste material put into 35 tons of square furnaces using charging vehicle carries out melting；
2) sample：Treat that waste material all melts in stove, and be sampled after reaching 710-750 DEG C of probe temperature；
3) dispensing：According to primary sample testing result and dispensing value, calculate the species that needs to put into intermediate alloy and
Weight, the intermediate alloy of calculating is put into stove according to required weight；
4) stove is fallen：Stove is carried out down when melt temperature reaches more than 730 DEG C, stokehold fully dries chute；
5) refine：Refined using gas-solid refining agent, refining time is not less than 15min；During refining, refining tube head should not have
Enter in melt, and each position is uniformly moved in melt；
Described gas-solid refining agent is：Nitrogen+4AB sodium-free refining agents；
6) stand：Refining, which finishes, closes fire door progress melt standing and melt temperature is adjusted into 700 DEG C -740 simultaneously
DEG C, time of repose >=20min, cast afterwards；After the completion of to be refined so that melt stands more than 20min in holding furnace；
7) online degasification：Use N2Degasification, inspection preparation is carried out before degasification；
8) on-line filtration：Filtered using the double-layer filter plate that mesh number is 20ppi and 30ppi；
9) cast：In casting process, holding furnace casting temperature is maintained at 730 DEG C -750 DEG C, casting speed 15mm/
Min-30mm/min, cooling water flow 500L/min-1500L/min.
The object of the invention to solve the technical problems can be also applied to the following technical measures to achieve further.
The mark of the casting technique, wherein step (3) the dispensing value of a kind of foregoing big aluminum alloy round casting rod of specification 7005
It is accurate to be according to percentage by weight：Si 0.35%, Fe 0.40%, Cu 0.10%, Mn 0.20-0.7%, Mg 1.0-1.8%,
Cr 0.06-0.20%, Zn 4.0-5.0%, Ti 0.01-0.06%, Zr0.08-0.2%.
The furnace temperature that falls of a kind of casting technique of foregoing big aluminum alloy round casting rod of specification 7005, wherein step (4) is 730
℃-760℃。
A kind of casting technique of foregoing big aluminum alloy round casting rod of specification 7005, the wherein refining temperature of step (5) are 700
℃-750℃。
A kind of casting technique of foregoing big aluminum alloy round casting rod of specification 7005, wherein melting and holding stage use 4#
Flux is as coverture, and smelt stage includes feeding intake, sample and blending process, holding stage include refining and standing process.
Gas during a kind of casting technique, wherein step (7) online degasification of foregoing big aluminum alloy round casting rod of specification 7005
Rotating speed is 330rpm-420rpm, gas flow 40m3/h-60m3/h。
A kind of casting technique of foregoing big aluminum alloy round casting rod of specification 7005, the wherein filter described in step (8) are
Foamed ceramic filter plate.
A kind of casting technique of foregoing big aluminum alloy round casting rod of specification 7005, wherein step (9) use crystal grain when casting
Fining agent AlTi5B1。
A kind of casting technique of foregoing big aluminum alloy round casting rod of specification 7005, the casting technique fill without using pulsating water
Put, dummy bar head is without fine aluminium shop fixtures and without Wiper blade equipment.
The casting technique of foregoing a kind of big aluminum alloy round casting rod of specification 7005, wherein the described aluminium of big specification 7005 closes
A diameter of 458mm of gold circle casting rod.
Relatively conventional casting technique, it is an advantage of the invention that：
(1) it is alloy one-level waste material feeding intake the raw material 100% used in link as non-7, is all being made using one-level waste material
On the premise of for raw material, with reference to the casting technique of the present invention, it gained aluminium alloy cast rod is reached qualified requirement, stretch
Experimental result is significantly larger than state's scale value, and greatly reduces the cost of raw material, has great economic benefit.
(2) gas-solid refining agent (N is used in refining procedure2Nitrogen+4AB sodium-free refining agents) refined, nitrogen refining
It can avoid polluting, and cost can be reduced, solid 4AB sodium-free refining agents, while there is slag making, refining effect is good.
(3) casting technique of the invention is without using pulse water installations；Dummy bar head is set without fine aluminium shop fixtures and without Wiper blade
It is standby, reduce equipment investment and operating cost.
(4) grain refiner AlTi is used in crystal grain refinement link5B1Substitute AlTi5B0.2, AlTi5B1Cost compared with
AlTi5B0.2It is much lower, casting cost is not only reduced, and effectively kept away on the premise of online refinement Ti contents lifting 0.015%
Exempted from B content introduce caused by casting crack, even if using the present invention casting technique B contents increase, still it is possible to prevente effectively from
The appearance of casting crack.
(5) macrostructure of 7005 aluminium alloy cast rods of the final gained of casting technique of the invention is fine and closely woven, and no coarse grain ring can not
Face weaker zone is shown in Table, without other tissue defects.Can be on the premise of not possessing required casting frock and raw and auxiliary material, fully
Cast using existence conditions, substantially reduce casting cost and reduce using and purchasing for intermediate alloy and frock.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of specification, and in order to allow the above and other objects, features and advantages of the present invention can
Become apparent, below especially exemplified by preferred embodiment, describe in detail as follows.
Embodiment
It is understandable to make those skilled in the art become apparent from the present invention, below by specific embodiment to the present invention
A kind of casting technique of the big aluminum alloy round casting rods of specification 7005 of Φ 458mm is described in detail.
A kind of casting technique of the big aluminum alloy round casting rods of specification 7005 of Φ 458mm of the present invention, comprises the following steps：
1) feed intake：Raw material 100% used is alloy one-level waste material for non-7, and waste material is put into 35 tons of squares using charging vehicle
Melting is carried out in shape stove.
2) sample；Treat that waste material all melts in stove, and be sampled after reaching 710-750 DEG C of probe temperature.
3) dispensing；According to primary sample testing result and dispensing value, calculate the species that needs to put into intermediate alloy and
Weight, the intermediate alloy of calculating is put into stove according to required weight.
The percentage by weight of dispensing such as following table：
The ingredients by weight percentage of table 1.
In upper table, nickel content is without control.
4) stove is fallen：Stokehold fully dries chute, and the control of falling furnace temperature is at 730 DEG C -760 DEG C；
5) refine：Using gas-solid refining agent (N2Nitrogen+4AB sodium-free refining agents) refined, 700 DEG C of refining temperature-
750 DEG C, the time is not less than 15min；
6) stand：Refining, which finishes, closes fire door progress melt standing and melt temperature is adjusted into 700 DEG C -740 simultaneously
DEG C, time of repose >=20min, it could be cast afterwards.
7) online degasification：The process uses N2Degasification, gas rotating speed are 330rpm-420rpm, gas flow 40m3/h-
60m3/ h, inspection preparation is carried out before degasification；
8) on-line filtration：Filtered using 20ppi and 30ppi foamed ceramic filter plates；
9) cast：In casting process, holding furnace casting temperature is maintained at 730 DEG C -750 DEG C, casting speed 15mm/
Min-30mm/min, cooling water flow 500L/min-1500L/min.During casting, grain refiner AlTi is used5B1Substitute
AlTi5B0.2, casting crack caused by B content introduces is effectively prevent on the premise of online refinement Ti contents lifting 0.015%；
Without using pulse water installations；Dummy bar head is without fine aluminium shop fixtures and without Wiper blade equipment.
Smelt stage and holding stage use 4#Flux is as coverture；4#The surface tension of flux is small, it is easier to soaks
Aluminium water, coverage effect are more preferable.Wherein, smelt stage refers to feeding intake, sampling, the process of dispensing, holding stage refer to refining and it is quiet
The process put.
Macrostructure can obtain by above specific embodiment fine and closely woven, no coarse grain ring, no surface porosity layer, without other groups
Knit 7005 aluminium alloy cast rods of defect.In casting process, grain refiner AlTi is used5B1Substitute AlTi5B0.2, 7005 alloys
The introducing of reduction B content as far as possible is needed during casting, and one of the advantages of the present invention is exactly in the case where B is more, can also be protected
7005 aluminium alloys are demonstrate,proved without casting crack.
Casting 7 is either that alloy needs pulse water installations at present, or need fine aluminium shop fixtures and use Wiper blade equipment.This
The casting technique of invention is realized by the cooperation of whole technological parameter and spread without pulse water installations, dummy bar head without fine aluminium
Bottom and without Wiper blade equipment, can not only reduce the use of part frock, can also greatly reduce the expense of raw material fine aluminium, have
There is very big economic benefit.
It is specific as follows that expense saves situation：
Pulse water installations are not needed when the 1st, casting, this link can save the expense of pulse water installations and its auxiliary equipment；
2nd, by the casting technique of the present invention, without using Wiper blade in the case of without fine aluminium shop fixtures, this not only may be used
To save every stove 220Kg fine aluminium expense (about 0.3 ten thousand yuan or so), Wiper blade, electric casting ladle and related auxiliary can also be saved
The expense of facility.
In addition, by the big aluminum alloy round casting rods of specification 7005 of Φ 458mm made from this casting technique, in 75MN extruders
On can realize low temperature crushing failure at high speed when being extruded, section bar soldering is good；In higher hardening heat lower sectional material surface quality
Well；The mechanical index measured by mechanical property tests is substantially better than state's scale value, and table 2 is the big rule of Φ 458mm obtained by the present invention
The mechanical experimental results of the aluminum alloy round casting rod of lattice 7005.
The Tensile Test Results alloy state of table 2.：7005T6
In upper table, the tensile strength of aluminum alloy round casting rod is higher than 440MPa (state's scale value is 350MPa), and yield strength is higher than
410MPa (state's scale value is 290MPa), significantly larger than elongation after fracture 16% (state's scale value is 10%), state's scale value.
The technique of the present invention significantly reduces the use of necessary frock in casting process, and casting cost greatly reduces
And reduce the use of intermediate alloy, there is obvious economic benefit；And the drawing of aluminum alloy round casting rod obtained by present invention process
Stretch experimental result and be significantly larger than state's scale value.
The present invention is set forth by above example to the present invention, is come for the technical staff of aluminium alloy casting field
Say, the present invention can also be continued to improve, but simple modifications and changes are carried out for the present invention, each fall within the present invention's
Within protection domain.
Claims (10)
1. a kind of casting technique of the aluminum alloy round casting rod of big specification 7005, it is characterised in that comprise the following steps：
1) feed intake：By 100% non-7, to be alloy one-level waste material put into 35 tons of square furnaces using charging vehicle carries out melting；
2) sample：Treat that waste material all melts in stove, and be sampled after reaching 710-750 DEG C of probe temperature；
3) dispensing：According to primary sample testing result and dispensing value, the species and weight for needing to put into intermediate alloy are calculated,
The intermediate alloy of calculating is put into stove according to required weight；
4) stove is fallen：Stove is carried out down when melt temperature reaches more than 730 DEG C, stokehold fully dries chute；
5) refine：Refined using gas-solid refining agent, refining time is not less than 15min；During refining, refining tube head should submerge molten
In vivo, and each position is uniformly moved in melt；
Described gas-solid refining agent is：Nitrogen+4AB sodium-free refining agents；
6) stand：Refining, which finishes, closes fire door progress melt standing and melt temperature is adjusted into 700 DEG C -740 DEG C simultaneously, stands
Time >=20min, cast afterwards；After the completion of to be refined so that melt stands more than 20min in holding furnace；
7) online degasification：Use N2Degasification, inspection preparation is carried out before degasification；
8) on-line filtration：Filtered using the double-layer filter plate that mesh number is 20ppi and 30ppi；
9) cast：In casting process, holding furnace casting temperature is maintained at 730 DEG C -750 DEG C, casting speed 15mm/min-
30mm/min, cooling water flow 500L/min-1500L/min.
2. the casting technique of the big aluminum alloy round casting rod of specification 7005 as claimed in claim 1, it is characterised in that step (3) is described
The standard of dispensing value is according to percentage by weight：Si 0.35%, Fe 0.40%, Cu 0.10%, Mn 0.20-0.7%, Mg
1.0-1.8%, Cr 0.06-0.20%, Zn 4.0-5.0%, Ti 0.01-0.06%, Zr0.08-0.2%.
3. the casting technique of the big aluminum alloy round casting rod of specification 7005 as claimed in claim 1, it is characterised in that step (4) is fallen
Furnace temperature is 730 DEG C -760 DEG C.
4. the casting technique of the big aluminum alloy round casting rod of specification 7005 as claimed in claim 1, it is characterised in that the essence of step (5)
It is 700 DEG C -750 DEG C to refine temperature.
5. the casting technique of the big aluminum alloy round casting rod of specification 7005 as claimed in claim 1, it is characterised in that melting and insulation
Stage uses 4# flux as coverture, and smelt stage includes feeding intake, samples and blending process, holding stage include refining and
Standing process.
6. the casting technique of the big aluminum alloy round casting rod of specification 7005 as claimed in claim 1, it is characterised in that step (7) is online
Gas rotating speed is 330rpm-420rpm, gas flow 40m during degasification3/h-60m3/h。
7. the casting technique of the big aluminum alloy round casting rod of specification 7005 as claimed in claim 1, it is characterised in that step (8) is described
Filter be foamed ceramic filter plate.
8. the casting technique of the big aluminum alloy round casting rod of specification 7005 as claimed in claim 1, it is characterised in that step (9) is cast
When use grain refiner AlTi5B1。
9. the casting technique of the big aluminum alloy round casting rod of specification 7005 as claimed in claim 1, it is characterised in that the founder
Skill is without using pulse water installations, and dummy bar head is without fine aluminium shop fixtures and without Wiper blade equipment.
10. the casting technique of the big aluminum alloy round casting rod of specification 7005 as claimed in claim 1, it is characterised in that described big rule
A diameter of 458mm of the aluminum alloy round casting rod of lattice 7005.
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| CN201710861033.9A CN107653388A (en) | 2017-09-21 | 2017-09-21 | A kind of casting technique of the aluminum alloy round casting rod of big specification 7005 |
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| CN201710861033.9A CN107653388A (en) | 2017-09-21 | 2017-09-21 | A kind of casting technique of the aluminum alloy round casting rod of big specification 7005 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110760706A (en) * | 2018-07-26 | 2020-02-07 | 中国科学院过程工程研究所 | Method for preparing copper-containing aluminum alloy by recycling aviation industry aluminum alloy waste |
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| CN110760706A (en) * | 2018-07-26 | 2020-02-07 | 中国科学院过程工程研究所 | Method for preparing copper-containing aluminum alloy by recycling aviation industry aluminum alloy waste |
| US11939644B2 (en) | 2018-07-26 | 2024-03-26 | The Boeing Company | Method for regenerating copper-containing aluminum alloy from aluminum alloy scrap |
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