CN108977677B - Modification treatment method for aluminum alloy in low-pressure casting process - Google Patents

Modification treatment method for aluminum alloy in low-pressure casting process Download PDF

Info

Publication number
CN108977677B
CN108977677B CN201810869647.6A CN201810869647A CN108977677B CN 108977677 B CN108977677 B CN 108977677B CN 201810869647 A CN201810869647 A CN 201810869647A CN 108977677 B CN108977677 B CN 108977677B
Authority
CN
China
Prior art keywords
low
pressure
aluminum alloy
casting
alterant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201810869647.6A
Other languages
Chinese (zh)
Other versions
CN108977677A (en
Inventor
陈瑞强
安庆贺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yingpu Aviation Technology Co., Ltd
Original Assignee
Impro Aviation Components Wuxi Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Impro Aviation Components Wuxi Co ltd filed Critical Impro Aviation Components Wuxi Co ltd
Priority to CN201810869647.6A priority Critical patent/CN108977677B/en
Publication of CN108977677A publication Critical patent/CN108977677A/en
Application granted granted Critical
Publication of CN108977677B publication Critical patent/CN108977677B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/026Alloys based on aluminium
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00Pressure casting; Vacuum casting
    • B22D18/04Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/20Measures not previously mentioned for influencing the grain structure or texture; Selection of compositions therefor
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/06Making alloys with the use of special agents for refining or deoxidising

Abstract

The invention provides a method for modifying aluminum alloy in a low-pressure casting process, which comprises the following steps: (1) and smelting aluminum liquid: adding 200kg of aluminum alloy ingot into a graphite crucible in a resistance crucible furnace, electrifying and preheating to 400-500 ℃, and preserving heat for 0.5 h; (2) refining treatment: raising the temperature of the furnace burden in the last step to 720-750 ℃, adding an Al-Ti-B grain refiner with the content of 0.3% after the furnace burden is completely melted, and introducing argon with the purity of 99.99% for rotary degassing; (3) and modification treatment: after the degassing and slagging-off operation is finished, low-pressure casting is carried out, and a Sr alterant with the content of 0.01 percent is introduced in the low-pressure casting liquid-raising stage; (4) and a pressure relief part: and after the low-pressure pouring cycle is finished, releasing pressure and taking out the casting to perform the next pouring cycle. The casting produced by the modification method has no pinhole defect through X-ray inspection.

Description

Modification treatment method for aluminum alloy in low-pressure casting process
Technical Field
The invention relates to a low-pressure casting method of aluminum and aluminum alloy, belongs to the technical field of aluminum and aluminum alloy casting, and particularly relates to a modification treatment method of aluminum alloy in a low-pressure casting process.
Background
Aluminum is the most common metal in nonferrous metals, and aluminum alloy is widely applied to the fields of transportation, machinery, aerospace and the like due to a series of advantages of small density, high specific strength, excellent electric and heat conductivity and the like.
Aluminum alloy alterants are divided into single alterants and composite alterants. The Sr alterant has the advantages of good modification effect, long maintenance time, simple operation, no pollution and the like, thereby being developed rapidly compared with other alterants. Meanwhile, Sr element is active in chemical property and easy to oxidize, the Sr element is continuously oxidized and burnt with the extension of the heat preservation time of the melt, and the existence of Sr element increases the gas absorption tendency of the melt, so that the compactness of the alloy is reduced.
In the case of casting, when an aluminum alloy using an Sr alterant is poured for a long time, pinhole defects are easily generated in a casting.
Disclosure of Invention
The invention aims at the characteristic of long pouring process of low-pressure casting, and adopts an aluminum alloy modification treatment method to solve the problem of casting pinhole defect caused by long-time pouring due to the addition of Sr modifier in the production process.
The technical scheme of the invention is as follows:
in order to solve the technical problem, the invention provides a method for modifying aluminum alloy in a low-pressure casting process, which is characterized by comprising the following steps of:
(1) and smelting aluminum liquid: adding 200kg of aluminum alloy ingot into a graphite crucible in a resistance crucible furnace, electrifying and preheating to 400-500 ℃, and preserving heat for 0.5 h;
(2) refining treatment: raising the temperature of the furnace burden in the last step to 720-750 ℃, adding an Al-Ti-B grain refiner with the content of 0.3% after the furnace burden is completely melted, and introducing argon with the purity of 99.99% for rotary degassing;
(3) and modification treatment: after the degassing and slagging-off operation is finished, low-pressure casting is carried out, and a Sr alterant with the content of 0.007-0.01% is introduced in the low-pressure casting liquid rising stage;
(4) and a pressure relief part: and after the low-pressure pouring cycle is finished, releasing pressure and taking out the casting to perform the next pouring cycle.
The scheme is further improved, the aluminum alloy ingot adopts A356.0, and the content of each element is as follows: 6.5-7.5% of Si, 0-0.2% of Fe, 0-0.2% of Cu, 0-0.1% of Mn, 0.25-0.45% of Mg, 0-0.1% of Zn, 0-0.2% of Ti, no more than 0.05% of each impurity element, no more than 0.15% of total amount and the balance of Al.
In a further improvement of the scheme, the content of the Sr alterant in the step 3 is 0.01 percent.
In a further improvement of the above scheme, the degassing time in step 2 is 30 min.
The scheme is further improved, the Sr alterant needs to be prefabricated into a required shape, and the alterant is clamped between two filter screens during casting: the first filter screen and the second filter screen are arranged between the first filter screen and the second filter screen and are arranged at the position of the riser pipe orifice.
Has the advantages that:
1. the Sr alterant is introduced in the low-pressure casting liquid-lifting process, and the Sr alterant with the content of 0.01 percent is added in each working cycle.
2. The tensile strength of the A356.0 alloy after being heat treated by 0.01 percent Sr content modification is 282MPa, the yield strength is 200MPa, the elongation is 9.1 percent, and the performance of the A356.0 alloy is obviously improved compared with the performance of the aluminum alloy without adding Sr modifier and 0.007 percent of Sr modifier.
3. The casting produced by the modification method has no pinhole defect through X-ray inspection.
Drawings
Fig. 1 is a schematic view of the placement of an Sr alterant.
FIG. 2 is a metallographic structure of a casting according to example 1.
FIG. 3 is a metallographic structure of a casting according to example 2.
FIG. 4 is a metallographic structure of a casting according to example 3.
FIG. 5 shows mechanical properties of the aluminum alloys subjected to the respective refining and modifying treatments.
Detailed Description
The invention is further illustrated by the following specific figures and examples.
A modification treatment method of aluminum alloy in a low-pressure casting process is characterized by comprising the following steps:
(1) and smelting aluminum liquid: adding 200kg of aluminum alloy ingot into a graphite crucible in a resistance crucible furnace, electrifying and preheating to 400-500 ℃, and preserving heat for 0.5 h;
(2) refining treatment: raising the temperature of the furnace burden in the last step to 720-750 ℃, adding an Al-Ti-B grain refiner with the content of 0.3% after the furnace burden is completely melted, and introducing argon with the purity of 99.99% for rotary degassing;
(3) and modification treatment: after the degassing and slagging-off operation is finished, low-pressure casting is carried out, and a Sr alterant with the content of 0.007-0.01% is introduced in the low-pressure casting liquid rising stage;
(4) and a pressure relief part: and after the low-pressure pouring cycle is finished, releasing pressure and taking out the casting to perform the next pouring cycle.
The scheme is further improved, the aluminum alloy ingot adopts A356.0, and the content of each element is as follows: 6.5-7.5% of Si, 0-0.2% of Fe, 0-0.2% of Cu, 0-0.1% of Mn, 0.25-0.45% of Mg, 0-0.1% of Zn, 0-0.2% of Ti, no more than 0.05% of each impurity element, no more than 0.15% of total amount and the balance of Al.
In a further improvement of the scheme, the content of the Sr alterant in the step 3 is 0.01 percent.
In a further improvement of the above scheme, the degassing time in step 2 is 30 min.
The scheme is further improved, the Sr alterant needs to be prefabricated into a required shape, and the alterant is clamped between two filter screens during casting: the first filter screen 1 and the second filter screen 2 are arranged between the riser pipe orifices.
As shown in fig. 1 to 5, example 1:
(1) adding 200kg of A356.0 aluminum alloy ingot into a graphite crucible in a resistance crucible furnace, electrifying and preheating to 400-500 ℃, and preserving heat for 0.5 h;
(2) and raising the temperature to 720-750 ℃, adding an Al-Ti-B grain refiner with the content of 0.3% after the furnace burden is completely melted, and introducing argon with the purity of 99.99% for rotary degassing for 30 min.
(3) After the degassing and slagging-off operation is finished, low-pressure casting is carried out, and in this case, no alterant is added.
(4) And after the low-pressure pouring cycle is finished, releasing pressure and taking out the casting to perform the next pouring cycle.
Example 2:
(1) 200kg of A356.0 aluminum alloy ingot is added into a graphite crucible in a resistance crucible furnace, and is electrified and preheated to 400-500 ℃, and the temperature is kept for 0.5 h.
(2) And raising the temperature to 720-750 ℃, adding an Al-Ti-B grain refiner with the content of 0.3% after the furnace burden is completely melted, and introducing argon with the purity of 99.99% for rotary degassing for 30 min.
(3) After the degassing and slagging-off operation is finished, low-pressure casting is carried out, and a Sr alterant with the content of 0.007 percent is introduced in the low-pressure casting liquid rising stage.
(4) And after the low-pressure pouring cycle is finished, releasing pressure and taking out the casting to perform the next pouring cycle.
Example 3:
(1) 200kg of A356.0 aluminum alloy ingot is added into a graphite crucible in a resistance crucible furnace, and is electrified and preheated to 400-500 ℃, and the temperature is kept for 0.5 h.
(2) And raising the temperature to 720-750 ℃, adding an Al-Ti-B grain refiner with the content of 0.3% after the furnace burden is completely melted, and introducing argon with the purity of 99.99% for rotary degassing for 30 min.
(3) After the degassing and slagging-off operation is finished, low-pressure casting is carried out, and a Sr alterant with the content of 0.01 percent is introduced in the low-pressure casting liquid-raising stage.
(4) And after the low-pressure pouring cycle is finished, releasing pressure and taking out the casting to perform the next pouring cycle.
The same position of the casting produced in each example after the heat treatment was sampled, and the metallographic structure thereof was as shown in fig. 2, 3, and 4. It can be seen that the eutectic silicon phase is not refined and is dispersed in the eutectic structure in the form of long stripes when the Sr alterant is not added. When 0.007% of Sr alterant is added, the eutectic silicon phase begins to be refined, but the refinement is incomplete, and the eutectic silicon phase is dispersed in a point-shaped or rod-shaped manner in the eutectic structure. When 0.01% of Sr alterant is added, the eutectic silicon is completely refined and is uniformly dispersed in the eutectic structure in a dotted manner.
The tensile strength, yield strength and elongation of each sample were further tested, and the results are shown in fig. 5. As can be seen from FIG. 5, by adopting the modification treatment method, various mechanical properties of the aluminum alloy can be remarkably improved, and the application range of the Sr modifier in low-pressure casting of the aluminum alloy is expanded.
No pinhole defect of the castings prepared in the embodiments is found by X-ray detection.
The low pressure casting method of the present invention mainly vacuumizes the air on the die disc, presses the aluminum liquid into the crystallizer through pressure difference, and then realizes the casting of the horizontal liquid level through the adjustment of the liquid level of the discharge hole and the launder, so that the pressure difference of the casting liquid level is reduced, and the crystallization height can be adjusted through the air pressure adjustment of the discharge hole. The present invention maintains the advantages of conventional hot top and gas slide casting, and improves the surface quality of the casting and reduces segregation on the structure, as shown in the following by comparing fig. 3 with fig. 4. In addition, the adjustable crystallization height realizes that one crystallizer meets the requirements of different grades, reduces the production cost and improves the production efficiency and the quality of extruded products.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims (4)

1. A modification treatment method of aluminum alloy in a low-pressure casting process is characterized by comprising the following steps:
(1) and smelting aluminum liquid: adding 200kg of aluminum alloy ingot into a graphite crucible in a resistance crucible furnace, electrifying and preheating to 400-500 ℃, and preserving heat for 0.5 h;
(2) refining treatment: raising the temperature of the furnace burden in the last step to 720-750 ℃, adding an Al-Ti-B grain refiner with the content of 0.3% after the furnace burden is completely melted, and introducing argon with the purity of 99.99% for rotary degassing;
(3) and modification treatment: after the degassing and slagging-off operation is finished, low-pressure casting is carried out, and a Sr alterant with the content of 0.007-0.01% is introduced in the low-pressure casting liquid rising stage;
(4) and a pressure relief part: after the low-pressure pouring cycle is finished, releasing pressure and taking out the casting to perform the next pouring cycle;
the Sr alterant needs to be prefabricated into a required shape, and the alterant is clamped between two filter screens during casting: the first filter screen (1) and the second filter screen (2) are arranged between the riser pipe orifice.
2. The method for modifying the aluminum alloy in the low-pressure casting process according to claim 1, wherein the aluminum alloy ingot is A356.0, and the contents of the elements are respectively as follows: 6.5-7.5% of Si, 0-0.2% of Fe, 0-0.2% of Cu, 0-0.1% of Mn, 0.25-0.45% of Mg, 0-0.1% of Zn, 0-0.2% of Ti, no more than 0.05% of each impurity element, no more than 0.15% of total amount and the balance of Al.
3. The method according to claim 1, wherein the content of Sr alterant in the step 3 is 0.01%.
4. The method of claim 1, wherein the degassing time in step 2 is 30 min.
CN201810869647.6A 2018-08-02 2018-08-02 Modification treatment method for aluminum alloy in low-pressure casting process Active CN108977677B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810869647.6A CN108977677B (en) 2018-08-02 2018-08-02 Modification treatment method for aluminum alloy in low-pressure casting process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810869647.6A CN108977677B (en) 2018-08-02 2018-08-02 Modification treatment method for aluminum alloy in low-pressure casting process

Publications (2)

Publication Number Publication Date
CN108977677A CN108977677A (en) 2018-12-11
CN108977677B true CN108977677B (en) 2020-08-04

Family

ID=64554555

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810869647.6A Active CN108977677B (en) 2018-08-02 2018-08-02 Modification treatment method for aluminum alloy in low-pressure casting process

Country Status (1)

Country Link
CN (1) CN108977677B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
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

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0919740A (en) * 1995-07-04 1997-01-21 Chubu Corp:Kk Strainer for cast iron inoculation and its inoculation
JP3962450B2 (en) * 1997-07-03 2007-08-22 アイシン高丘株式会社 Inoculation filter and cast iron inoculation method
CN101966575A (en) * 2010-11-13 2011-02-09 河南理工大学 Process for casting aluminum alloy wheel and heat treatment process
CN102699312A (en) * 2012-07-12 2012-10-03 上海嘉朗实业有限公司 Low-pressure casting process and mould for aluminium alloy steering knuckle
CN104741574A (en) * 2013-12-25 2015-07-01 青岛玉光精铸厂 Low-pressure casting process of aluminum alloy steering joint
CN104741575A (en) * 2013-12-25 2015-07-01 青岛玉光精铸厂 Low-pressure casting and manufacturing technology of aluminum alloy cylinder part
CN106925756A (en) * 2017-02-23 2017-07-07 中国第汽车股份有限公司 A kind of low-pressure casting preparation method of aluminum alloy auxiliary vehicle frame

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0919740A (en) * 1995-07-04 1997-01-21 Chubu Corp:Kk Strainer for cast iron inoculation and its inoculation
JP3962450B2 (en) * 1997-07-03 2007-08-22 アイシン高丘株式会社 Inoculation filter and cast iron inoculation method
CN101966575A (en) * 2010-11-13 2011-02-09 河南理工大学 Process for casting aluminum alloy wheel and heat treatment process
CN102699312A (en) * 2012-07-12 2012-10-03 上海嘉朗实业有限公司 Low-pressure casting process and mould for aluminium alloy steering knuckle
CN104741574A (en) * 2013-12-25 2015-07-01 青岛玉光精铸厂 Low-pressure casting process of aluminum alloy steering joint
CN104741575A (en) * 2013-12-25 2015-07-01 青岛玉光精铸厂 Low-pressure casting and manufacturing technology of aluminum alloy cylinder part
CN106925756A (en) * 2017-02-23 2017-07-07 中国第汽车股份有限公司 A kind of low-pressure casting preparation method of aluminum alloy auxiliary vehicle frame

Also Published As

Publication number Publication date
CN108977677A (en) 2018-12-11

Similar Documents

Publication Publication Date Title
CN108977677B (en) Modification treatment method for aluminum alloy in low-pressure casting process
CN106636806B (en) A kind of small grains moderate strength aluminium alloy and the preparation method and application thereof
RU2463371C2 (en) Magnesium-containing high-silica aluminium alloys used as structural materials and method of their manufacturing
WO2021098044A1 (en) High-performance aluminum alloy for semi-solid die casting, and preparation method thereof
CN105568082B (en) A kind of heat treatment method of Al Si Cu Mg casting alloys
CN108977702B (en) Aluminum alloy and preparation method of aluminum alloy casting
CN104959393A (en) Production method of aluminium alloy hot extrusion bar used for high-quality aviation blade
CN107447141A (en) A kind of electronic product casing high-strength aluminum alloy and preparation method thereof
CN111197132A (en) Non-heat treatment type high-strength die-casting aluminum alloy and preparation method thereof
CN111101034A (en) Low-rare-earth high-performance rare earth aluminum alloy and preparation method thereof
CN108517446A (en) A kind of preparation method of high toughness Al-alloy for evacuated die-casting process and products thereof
CN112831697A (en) High-strength coarse-grain-free aluminum alloy and preparation method and application thereof
WO2015135253A1 (en) Al-si alloy and manufacturing method thereof
CN112518170A (en) Al-Cu alloy wire for additive manufacturing and preparation method and application thereof
CN105401005A (en) Al-Si alloy material and production method thereof
JP3548709B2 (en) Method for producing semi-solid billet of Al alloy for transportation equipment
WO2019023818A1 (en) Readily cold-formable deformable zinc alloy material, preparation method therefor, and application thereof
CN109825747A (en) A kind of high Squeezing ground Cutting free bismuth-containing aluminium alloy of low cost and preparation method thereof
CN105112743A (en) High-toughness cast-forged aluminum alloy and preparation method thereof
CN111349829B (en) Production method of leather aluminum belt
JP3852915B2 (en) Method for producing semi-melt molded billet of aluminum alloy for transportation equipment
JP3840400B2 (en) Method for producing semi-melt molded billet of aluminum alloy for transportation equipment
JP3676723B2 (en) Method for producing semi-melt molded billet of aluminum alloy for transportation equipment
CN105624480A (en) Cast heat-resisting aluminum alloy and preparation process thereof
JP3798676B2 (en) Method for producing semi-melt molded billet of aluminum alloy for transportation equipment

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CP01 Change in the name or title of a patent holder

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.

CP01 Change in the name or title of a patent holder