CN108977677A - The metamorphism treatment method of aluminium alloy in a kind of low pressure casting process - Google Patents
The metamorphism treatment method of aluminium alloy in a kind of low pressure casting process Download PDFInfo
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- CN108977677A CN108977677A CN201810869647.6A CN201810869647A CN108977677A CN 108977677 A CN108977677 A CN 108977677A CN 201810869647 A CN201810869647 A CN 201810869647A CN 108977677 A CN108977677 A CN 108977677A
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- aluminium alloy
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- pressure casting
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- metamorphism treatment
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
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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
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/20—Measures not previously mentioned for influencing the grain structure or texture; Selection of compositions therefor
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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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- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
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Abstract
The present invention provides a kind of metamorphism treatment methods of aluminium alloy in low pressure casting process, the following steps are included: (1), melting molten aluminum: 200kg aluminium alloy ingots is added in the graphite crucible to electrical crucible, energization is preheated to 400 DEG C~500 DEG C, and keeps the temperature 0.5h；(2), micronization processes: the furnace charge in previous step is increased into temperature to 720~750 DEG C, after furnace charge is completely melt, content is added and is 0.3% Al-Ti-B grain refiner, and be passed through the argon gas that purity is 99.99% and carry out rotation degasification；(3), Metamorphism treatment: degasification is taken off after the completion of slag operation, carries out low-pressure casting, rises the Sr alterant of 0.01% content of liquid stage introducing in low-pressure casting；(4), pressure release pickup: after the completion of low-pressure casting circulation, casting is taken out in pressure release, carries out next casting circulation.Needle pore defect is had no through X-ray inspection using the casting of this metamorphism treatment method production.
Description
Technical field
The present invention relates to a kind of aluminium and aluminum alloy low-pressure casting methods, belong to aluminium and aluminium alloy casting technology field, specifically
For a kind of metamorphism treatment method of aluminium alloy in low pressure casting process.
Background technique
Aluminium is most common metal in non-ferrous metal, and aluminium alloy is since its density is small, specific strength is high, electrical and thermal conductivity performance
The series of advantages such as superior are widely used in the fields such as communications and transportation, machinery and aerospace.
Aluminum alloy modifier is divided into single alterant and composite modifier.When Sr alterant has good modification effect, maintenance
Between it is long and easy to operate pollution-free the advantages that, thus more other alterants are quickly grown.But meanwhile the chemical property of Sr element is living
It sprinkles, easy to oxidize, with the extension of melt holding time, Sr element will constantly be oxidized scaling loss, and the presence of Sr element increases
The air-breathing tendency of melt, causes alloy compactness to decline.
For casting, when be poured for a long time using the aluminium alloy of Sr alterant, pin hole is easy to produce in casting
Defect.
Summary of the invention
The present invention is directed to the long feature of low pressure casting casting process, using a kind of Aluminum alloy modification processing method, to solve
Because the addition of Sr alterant is poured bring casting needle pore defect problem for a long time in production process.
The technical scheme is that
In order to solve the above technical problems, in a kind of low pressure casting process of the present invention aluminium alloy metamorphism treatment method, feature exists
In, comprising the following steps:
(1), melting molten aluminum: 200kg aluminium alloy ingots is added in the graphite crucible to electrical crucible, and energization is preheated to 400
~500 DEG C, and keep the temperature 0.5h；
(2), micronization processes: the furnace charge in previous step is increased into temperature to 720~750 DEG C, after furnace charge is completely melt, is added
Content is 0.3% Al-Ti-B grain refiner, and is passed through the argon gas that purity is 99.99% and carries out rotation degasification；
(3), Metamorphism treatment: degasification is taken off after the completion of slag operation, carries out low-pressure casting, rises liquid stage introducing 0.007 in low-pressure casting
The Sr alterant of~0.01% content；
(4), pressure release pickup: after the completion of low-pressure casting circulation, casting is taken out in pressure release, carries out next casting circulation.
Further improvement of these options, aluminium alloy ingots use A356.0, each element content be respectively as follows: Si 6.5%~
7.5%, Fe 0~0.2%, Cu 0~0.2%, Mn 0~0.1%, Mg 0.25%~0.45%, Zn 0~0.1%, Ti 0~0.2%,
Every kind of impurity element is no more than 0.05%, and total amount is no more than 0.15%, and surplus is Al.
Further improvement of these options, the content of Sr alterant is 0.01% in step 3.
Further improvement of these options, the degasification time in step 2 are 30min.
Further improvement of these options, Sr alterant need to be prefabricated into the shape of needs, and alterant is clipped in two when casting
Piece filter screen: it between the first filter screen and the second filter screen and is placed at stalk nozzle.
The utility model has the advantages that
1. introducing Sr alterant during low pressure casting rises liquid, each working cycles add the Sr alterant of 0.01% content.
2. the tensile strength after the heat treatment of the A356.0 alloy of 0.01%Sr content Metamorphism treatment is 282MPa, surrender is strong
Spending is 200MPa, elongation 9.1%, and the aluminium alloy capability that Sr alterant and 0.007% content Sr alterant are not added has
It is obviously improved.
3. the casting using the production of this metamorphism treatment method has no needle pore defect through X-ray inspection.
Detailed description of the invention
Fig. 1 is the placement form schematic diagram of Sr alterant.
Fig. 2 is the metallographic structure of 1 casting of embodiment.
Fig. 3 is the metallographic structure of 2 casting of embodiment.
Fig. 4 is the metallographic structure of 3 casting of embodiment.
Fig. 5 is the mechanical performance of each fine degenerate processing aluminium alloy.
Specific embodiment
Below with reference to specific drawings and examples, the invention will be further described.
The metamorphism treatment method of aluminium alloy in a kind of low pressure casting process, which comprises the following steps:
(1), melting molten aluminum: 200kg aluminium alloy ingots is added in the graphite crucible to electrical crucible, and energization is preheated to 400
~500 DEG C, and keep the temperature 0.5h；
(2), micronization processes: the furnace charge in previous step is increased into temperature to 720~750 DEG C, after furnace charge is completely melt, is added
Content is 0.3% Al-Ti-B grain refiner, and is passed through the argon gas that purity is 99.99% and carries out rotation degasification；
(3), Metamorphism treatment: degasification is taken off after the completion of slag operation, carries out low-pressure casting, rises liquid stage introducing 0.007 in low-pressure casting
The Sr alterant of~0.01% content；
(4), pressure release pickup: after the completion of low-pressure casting circulation, casting is taken out in pressure release, carries out next casting circulation.
Further improvement of these options, aluminium alloy ingots use A356.0, each element content be respectively as follows: Si 6.5%~
7.5%, Fe 0~0.2%, Cu 0~0.2%, Mn 0~0.1%, Mg 0.25%~0.45%, Zn 0~0.1%, Ti 0~0.2%,
Every kind of impurity element is no more than 0.05%, and total amount is no more than 0.15%, and surplus is Al.
Further improvement of these options, the content of Sr alterant is 0.01% in step 3.
Further improvement of these options, the degasification time in step 2 are 30min.
Further improvement of these options, Sr alterant need to be prefabricated into the shape of needs, and alterant is clipped in two when casting
Piece filter screen: it between the first filter screen 1 and the second filter screen 2 and is placed at stalk nozzle.
As shown in Figs. 1-5, embodiment 1:
(1) 200kg A356.0 aluminium alloy ingots being added in the graphite crucible to electrical crucible, energization is preheated to 400~
500 DEG C, and keep the temperature 0.5h；
(2) temperature is increased to 720~750 DEG C, and after furnace charge is completely melt, the Al-Ti-B crystal grain refinement that content is 0.3% is added
Agent, and be passed through the argon gas that purity is 99.99% and carry out rotation degasification, the degasification time is 30min.
(3) degasification is taken off after the completion of slag operation, is carried out low-pressure casting, is added without alterant in this example.
(4) after the completion of low-pressure casting circulation, casting is taken out in pressure release, carries out next casting circulation.
Embodiment 2:
(1) 200kg A356.0 aluminium alloy ingots being added in the graphite crucible to electrical crucible, energization is preheated to 400~
500 DEG C, and keep the temperature 0.5h.
(2) temperature is increased to 720~750 DEG C, and after furnace charge is completely melt, the Al-Ti-B crystal grain that content is 0.3% is added
Fining agent, and be passed through the argon gas that purity is 99.99% and carry out rotation degasification, the degasification time is 30min.
(3) degasification is taken off after the completion of slag operation, carries out low-pressure casting, rises 0.007% content of liquid stage introducing in low-pressure casting
Sr alterant.
(4) after the completion of low-pressure casting circulation, casting is taken out in pressure release, carries out next casting circulation.
Embodiment 3:
(1) 200kg A356.0 aluminium alloy ingots being added in the graphite crucible to electrical crucible, energization is preheated to 400~
500 DEG C, and keep the temperature 0.5h.
(2) temperature is increased to 720~750 DEG C, and after furnace charge is completely melt, the Al-Ti-B crystal grain that content is 0.3% is added
Fining agent, and be passed through the argon gas that purity is 99.99% and carry out rotation degasification, the degasification time is 30min.
(3) degasification is taken off after the completion of slag operation, carries out low-pressure casting, rises 0.01% content of liquid stage introducing in low-pressure casting
Sr alterant.
(4) after the completion of low-pressure casting circulation, casting is taken out in pressure release, carries out next casting circulation.
Same position after heat treating castings made from each embodiment is sampled, gained metallographic structure such as Fig. 2, Fig. 3
With shown in Fig. 4.It can be seen that eutectic silicon is not refined when being not added with Sr alterant, it is in long strip to be dispersed in eutectic structure
In.When adding the Sr alterant of 0.007% content, eutectic silicon starts to refine, but refines not exclusively, in dotted or rodlike
It is dispersed in eutectic structure.When adding the Sr alterant of 0.01% content, Eutectic Silicon Refinement is complete, is dispersed in altogether in dotted
In crystalline substance tissue.
The tensile strength, yield strength and elongation percentage of each sample are further tested, acquired results are as shown in Figure 5.As Fig. 5 can
Know, using this metamorphism treatment method, every mechanical property of aluminium alloy can be obviously improved, it is low in aluminium alloy to extend Sr alterant
Die casting make in application range.
X-ray detection is carried out to casting made from each embodiment, does not find that there are needle pore defects for casting.
Air on mould is mainly evacuated by low-pressure casting method of the invention, is pressed into molten aluminum by pressure difference
Then crystallizer is realized the casting of horizontal liquid level by the adjusting of discharge orifice and chute liquid level, reduces the pressure of casting liquid level
Difference, and crystallization height can be adjusted by the air pressure adjustment of discharge orifice.The present invention maintains traditional heat top and Air-slip Casting
Advantage, and surface quality of continuous castings is improved, reduce structural segregation, the visible following comparison diagram 3 of details and Fig. 4.In addition,
Adjustable crystallization height realizes that a crystallizer meets the needs of different trades mark, reduces production cost, improves production effect
The quality of rate and extruded product.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (5)
1. the metamorphism treatment method of aluminium alloy in a kind of low pressure casting process, which comprises the following steps:
(1), melting molten aluminum: 200kg aluminium alloy ingots is added in the graphite crucible to electrical crucible, and energization is preheated to 400
DEG C~500 DEG C, and keep the temperature 0.5h；
(2), micronization processes: the furnace charge in previous step is increased into temperature to 720~750 DEG C, after furnace charge is completely melt, is added
Content is 0.3% Al-Ti-B grain refiner, and is passed through the argon gas that purity is 99.99% and carries out rotation degasification；
(3), Metamorphism treatment: degasification is taken off after the completion of slag operation, carries out low-pressure casting, rises liquid stage introducing 0.007 in low-pressure casting
The Sr alterant of~0.01% content；
(4), pressure release pickup: after the completion of low-pressure casting circulation, casting is taken out in pressure release, carries out next casting circulation.
2. the metamorphism treatment method of aluminium alloy in a kind of low pressure casting process according to claim 1, which is characterized in that aluminium
Alloy pig uses A356.0, and each element content is respectively as follows: Si 6.5%~7.5%, and Fe 0~0.2%, Cu 0~0.2%, Mn 0~
0.1%, Mg 0.25%~0.45%, Zn 0~0.1%, Ti 0~0.2%, every kind of impurity element is no more than 0.05%, and total amount is no more than
0.15%, surplus is Al.
3. the metamorphism treatment method of aluminium alloy in a kind of low pressure casting process according to claim 1, which is characterized in that step
The content of Sr alterant is 0.01% in rapid 3.
4. the metamorphism treatment method of aluminium alloy in a kind of low pressure casting process according to claim 1, which is characterized in that step
The degasification time in rapid 2 is 30min.
5. the metamorphism treatment method of aluminium alloy in a kind of low pressure casting process according to claim 1, which is characterized in that Sr
Alterant need to be prefabricated into the shape of needs, and alterant is clipped in two panels filter screen: the first filter screen (1) and the second filter screen when casting
(2) it between and is placed at stalk nozzle.
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| CN201810869647.6A CN108977677B (en) | 2018-08-02 | 2018-08-02 | Modification treatment method for aluminum alloy in low-pressure casting process |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110396626A (en) * | 2019-07-22 | 2019-11-01 | 张家港市众欣机械有限公司 | A kind of high tenacity, corrosion resistant aluminum alloy material and preparation method thereof |
| CN111378880A (en) * | 2020-02-24 | 2020-07-07 | 广东润华材料科技有限公司 | Rare earth cast aluminum alloy mobile phone shell and preparation method thereof |
| CN111618276A (en) * | 2020-07-18 | 2020-09-04 | 常州嘉阳轻合金有限公司 | Low-pressure casting process of iron eight-axis aluminum alloy gearbox |
| CN112575231A (en) * | 2020-11-16 | 2021-03-30 | 中国兵器科学研究院宁波分院 | Vacuum refining modification treatment method for A356 high-strength aluminum alloy |
| CN112775414A (en) * | 2021-01-11 | 2021-05-11 | 山东一立动力科技股份有限公司 | Low-pressure casting method of aluminum alloy fan blade |
| CN114559009A (en) * | 2022-02-28 | 2022-05-31 | 玉环市东南塑胶机电有限公司 | Wear-resistant aluminum alloy shell for high-voltage GIS and machining process thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110396626A (en) * | 2019-07-22 | 2019-11-01 | 张家港市众欣机械有限公司 | A kind of high tenacity, corrosion resistant aluminum alloy material and preparation method thereof |
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| CN114559009A (en) * | 2022-02-28 | 2022-05-31 | 玉环市东南塑胶机电有限公司 | Wear-resistant aluminum alloy shell for high-voltage GIS and machining process thereof |
| CN114559009B (en) * | 2022-02-28 | 2023-09-15 | 玉环市东南塑胶机电有限公司 | Wear-resistant aluminum alloy shell for high-voltage GIS and processing technology thereof |
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Address after: No.18 Furong 5th Road, Xishan Economic Development Zone, Wuxi City, Jiangsu Province Patentee after: Yingpu Aviation Technology Co., Ltd Address before: No.18 Furong 5th Road, Xishan Economic Development Zone, Wuxi City, Jiangsu Province Patentee before: IMPRO AVIATION COMPONENTS (WUXI) Co.,Ltd. |