CN110834063A - Sand mold casting process of aluminum-lithium alloy casting - Google Patents
Sand mold casting process of aluminum-lithium alloy casting Download PDFInfo
- Publication number
- CN110834063A CN110834063A CN201810933481.XA CN201810933481A CN110834063A CN 110834063 A CN110834063 A CN 110834063A CN 201810933481 A CN201810933481 A CN 201810933481A CN 110834063 A CN110834063 A CN 110834063A
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- Prior art keywords
- sand
- casting
- lithium alloy
- aluminum
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/12—Treating moulds or cores, e.g. drying, hardening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D35/00—Equipment for conveying molten metal into beds or moulds
- B22D35/04—Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a sand casting process of an aluminum-lithium alloy casting, belonging to the technical field of metal material casting, and comprising the following steps of: s1, manufacturing a mold, wherein the mold is made of a non-magnetic material; s2, uniformly mixing 100 parts by weight of metal sand and 2-4 parts by weight of chilled resin binder to prepare molding sand; s3, placing the mould in a sand box, and filling the sand box with molding sand to full extent to form a casting mould; s4, arranging a pouring gate and a riser, and closing the box; s5, heating the sand box; and S6, injecting the aluminum lithium alloy metal liquid into the casting mould, and performing sand falling and shot blasting treatment after the aluminum lithium alloy metal liquid is solidified to form a casting. The invention adopts the metal sand casting mold and the inclined pouring, has high stability of the cavity and stable mold filling, can reduce the occurrence of slag inclusion, is convenient for the exhaust of the casting mold, reduces the defect of air holes, and has high mechanical property of the casting.
Description
Technical Field
The invention relates to the technical field of metal material casting, in particular to a sand casting process of an aluminum-lithium alloy casting.
Background
Sand casting refers to a casting method for producing castings in sand molds, and a casting mold used for sand casting is generally formed by combining an outer sand mold and a core; steel, iron and most nonferrous castings can be obtained by sand casting of aluminum lithium alloy castings. The molding material used for sand casting is cheap and easy to obtain, the casting mould is simple and convenient to manufacture, and the casting mould can adapt to single-piece production, batch production and mass production of castings, and is a basic process in casting production for a long time. At present, 60-70% of castings are produced by sand molds internationally. However, because the molding material in sand casting is sand, the whole body of the molding material is soft and porous, the stability of the sand mold formed by the molding material is poor, the molding material is easy to collapse and deform, the pouring process needs to be very careful, and the sand mold can be damaged by a little attention to cause the pouring failure, and particularly under the conditions of large and long casting size and high casting precision requirement, the traditional sand mold casting process has certain difficulty; and secondly, the heat conductivity coefficient of the sand mold is small, so that the defects of large crystal grains, loose structure, sand holes, air holes and the like of the casting are easily caused, and the mechanical property of the casting is lower.
Disclosure of Invention
The invention aims to provide a sand casting process of an aluminum-lithium alloy casting, which aims at overcoming the defects of the prior art, adopts a metal sand casting mold and inclined casting, has high stability of a cavity, is stable in mold filling, can reduce slag inclusion, is convenient for exhaust of the casting mold, reduces the defect of air holes, and has high mechanical property of the casting.
The technical scheme adopted by the invention is as follows:
a sand casting process of an aluminum-lithium alloy casting comprises the following steps:
s1, manufacturing a mold, wherein the mold is made of a non-magnetic material;
s2, uniformly mixing 100 parts by weight of metal sand and 2-4 parts by weight of chilled resin binder to prepare molding sand;
s3, placing the mould in a sand box, and filling the sand box with molding sand to full extent to form a casting mould;
s4, arranging a pouring gate and a riser, and closing the box;
s5, heating the sand box;
and S6, injecting the aluminum lithium alloy metal liquid into the casting mould, and performing sand falling and shot blasting treatment after the aluminum lithium alloy metal liquid is solidified to form a casting.
In step S1, the mold is made of silicon carbide ceramic.
Further, in the step S5, the flask is irradiated with far infrared rays to be heated.
Further, in step S6, the sand box is tilted, the aluminum lithium alloy molten metal is poured from the gate, the sand box is leveled when the liquid level reaches the riser 1/3, and then the aluminum lithium alloy molten metal is poured from the riser until the sand box is full.
Further, step S3' is included after step S3, in which a high temperature resistant paint is coated on the surface of the cavity of the mold.
Further, the high-temperature resistant coating is composed of the following components: 40-60 parts of quartz powder, 40-60 parts of alcohol-based zircon powder, 1-5 parts of activated bentonite, 3-7 parts of water glass, 2-6 parts of phenolic resin and a proper amount of water.
Compared with the prior art, the invention has the following remarkable advantages and beneficial effects:
1. the metal sand has high mechanical strength and is not easy to break, mineral sand dust is not generated in the production process, and the pollution to the production environment is avoided; in addition, because the metal sand has large dead weight and round appearance, a clear and stable cavity can be formed without large external force during molding, and therefore, the metal sand can be assembled for production only by simple equipment, thereby saving a large amount of electric power, reducing noise during molding and cleaning equipment operation, and improving the working environment of a production site.
2. The sand box is heated by far infrared rays, so that the temperature of the casting mold is also increased; after the aluminum-lithium alloy molten metal enters the casting mold, the temperature difference between the casting mold and the aluminum-lithium alloy molten metal is small, the heat absorbed by the casting mold from the aluminum-lithium alloy molten metal is small, the cooling gradient of the aluminum-lithium alloy molten metal is mild, the time for keeping the aluminum-lithium alloy molten metal in a liquid state in the cavity is prolonged, the fluidity is good, the mold filling capacity is obviously improved, the casting mold is convenient to exhaust, the defect of air holes is reduced, and the improvement of the mechanical performance of a casting is facilitated.
3. The inclined pouring is performed, so that the stability is better, and the impact on a sand mold is small; the method for pouring the aluminum lithium alloy metal liquid from the pouring gate after tilting the sand box is creatively adopted, and then the sand box is flatly placed to perform the repotting on the rest aluminum lithium alloy metal liquid from the riser, has the advantage of stable mold filling, can reduce the occurrence of slag inclusion, is convenient for the air exhaust of a casting mold, reduces the defect of air holes, can improve the feeding effect of the riser and reduces the defect of shrinkage porosity.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1
A sand casting process of an aluminum-lithium alloy casting comprises the following steps:
s1, manufacturing a mould, wherein the mould is made of a silicon carbide ceramic material;
s2, uniformly mixing 100 parts by weight of metal sand and 3 parts by weight of chilled resin binder to prepare molding sand;
s3, placing the mould in a sand box, and filling the sand box with molding sand to full extent to form a casting mould;
s3', coating a high-temperature resistant coating on the surface of the cavity of the casting mold, wherein the high-temperature resistant coating comprises the following components: 50 parts of quartz powder, 50 parts of alcohol-based zircon powder, 3 parts of activated bentonite, 5 parts of water glass, 4 parts of phenolic resin and a proper amount of water.
S4, arranging a pouring gate and a riser, and closing the box;
s5, heating the sand box by far infrared rays;
and S6, firstly, inclining the sand box, injecting the aluminum lithium alloy molten metal from the pouring gate, flatly placing the sand box when the liquid level reaches the riser 1/3, then pouring the aluminum lithium alloy molten metal from the riser until the aluminum lithium alloy molten metal is fully poured, and performing sand falling and shot blasting treatment after the aluminum lithium alloy molten metal is solidified to form a casting.
Example 2
A sand casting process of an aluminum-lithium alloy casting comprises the following steps:
s1, manufacturing a mould, wherein the mould is made of a silicon carbide ceramic material;
s2, uniformly mixing 100 parts by weight of metal sand and 2 parts by weight of chilled resin binder to prepare molding sand;
s3, placing the mould in a sand box, and filling the sand box with molding sand to full extent to form a casting mould;
s3', coating a high-temperature resistant coating on the surface of the cavity of the casting mold, wherein the high-temperature resistant coating comprises the following components: 40 parts of quartz powder, 40 parts of alcohol-based zircon powder, 1 part of activated bentonite, 3 parts of water glass, 2 parts of phenolic resin and a proper amount of water.
S4, arranging a pouring gate and a riser, and closing the box;
s5, heating the sand box by far infrared rays;
and S6, firstly, inclining the sand box, injecting the aluminum lithium alloy molten metal from the pouring gate, flatly placing the sand box when the liquid level reaches the riser 1/3, then pouring the aluminum lithium alloy molten metal from the riser until the aluminum lithium alloy molten metal is fully poured, and performing sand falling and shot blasting treatment after the aluminum lithium alloy molten metal is solidified to form a casting.
Example 3
A sand casting process of an aluminum-lithium alloy casting comprises the following steps:
s1, manufacturing a mould, wherein the mould is made of a silicon carbide ceramic material;
s2, uniformly mixing 100 parts by weight of metal sand and 4 parts by weight of chilled resin binder to prepare molding sand;
s3, placing the mould in a sand box, and filling the sand box with molding sand to full extent to form a casting mould;
s3', coating a high-temperature resistant coating on the surface of the cavity of the casting mold, wherein the high-temperature resistant coating comprises the following components: 60 parts of quartz powder, 60 parts of alcohol-based zircon powder, 5 parts of activated bentonite, 7 parts of water glass, 6 parts of phenolic resin and a proper amount of water.
S4, arranging a pouring gate and a riser, and closing the box;
s5, heating the sand box by far infrared rays;
and S6, firstly, inclining the sand box, injecting the aluminum lithium alloy molten metal from the pouring gate, flatly placing the sand box when the liquid level reaches the riser 1/3, then pouring the aluminum lithium alloy molten metal from the riser until the aluminum lithium alloy molten metal is fully poured, and performing sand falling and shot blasting treatment after the aluminum lithium alloy molten metal is solidified to form a casting.
Claims (6)
1. A sand casting process of an aluminum-lithium alloy casting is characterized by comprising the following steps:
s1, manufacturing a mold, wherein the mold is made of a non-magnetic material;
s2, uniformly mixing 100 parts by weight of metal sand and 2-4 parts by weight of chilled resin binder to prepare molding sand;
s3, placing the mould in a sand box, and filling the sand box with molding sand to full extent to form a casting mould;
s4, arranging a pouring gate and a riser, and closing the box;
s5, heating the sand box;
and S6, injecting the aluminum lithium alloy metal liquid into the casting mould, and performing sand falling and shot blasting treatment after the aluminum lithium alloy metal liquid is solidified to form a casting.
2. A sand casting process for an aluminum lithium alloy casting according to claim 1, wherein in step S1, the mold is made of silicon carbide ceramic.
3. A sand casting process of an aluminum-lithium alloy casting according to claim 1, wherein the sand box is heated by irradiating far infrared rays thereto in step S5.
4. A sand casting process of an aluminum-lithium alloy casting according to claim 1, wherein in step S6, the sand box is tilted first, the aluminum-lithium alloy molten metal is poured from the pouring gate, the sand box is leveled when the liquid level reaches the riser 1/3, and then the aluminum-lithium alloy molten metal is poured from the riser until the casting is full.
5. A sand casting process of an aluminum lithium alloy casting according to claim 1, further comprising a step S3' of coating a high temperature resistant paint on the surface of the cavity of the mold after the step S3.
6. A sand casting process for an aluminum lithium alloy casting according to claim 5, wherein the high temperature resistant coating is comprised of the following components: 40-60 parts of quartz powder, 40-60 parts of alcohol-based zircon powder, 1-5 parts of activated bentonite, 3-7 parts of water glass, 2-6 parts of phenolic resin and a proper amount of water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810933481.XA CN110834063A (en) | 2018-08-16 | 2018-08-16 | Sand mold casting process of aluminum-lithium alloy casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810933481.XA CN110834063A (en) | 2018-08-16 | 2018-08-16 | Sand mold casting process of aluminum-lithium alloy casting |
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| Publication Number | Publication Date |
|---|---|
| CN110834063A true CN110834063A (en) | 2020-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810933481.XA Withdrawn CN110834063A (en) | 2018-08-16 | 2018-08-16 | Sand mold casting process of aluminum-lithium alloy casting |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112792319A (en) * | 2020-12-17 | 2021-05-14 | 山西江淮重工有限责任公司 | Counter-pressure casting process and counter-pressure casting equipment for lithium alloy castings |
| CN113996756A (en) * | 2021-10-28 | 2022-02-01 | 华中科技大学 | Preparation method of aluminum-lithium alloy based on graphite sand casting mold and product |
| CN113996759A (en) * | 2021-10-29 | 2022-02-01 | 华中科技大学 | Aluminum lithium alloy casting adopting shell to inhibit interface reaction and casting method thereof |
| CN114985673A (en) * | 2022-05-26 | 2022-09-02 | 华中科技大学 | Casting coating using lithium silicate as binder and suitable for sand casting of aluminum-lithium alloy |
| CN115255268A (en) * | 2022-06-10 | 2022-11-01 | 哈尔滨理工大学 | Non-compact casting mold based on porous structure |
-
2018
- 2018-08-16 CN CN201810933481.XA patent/CN110834063A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112792319A (en) * | 2020-12-17 | 2021-05-14 | 山西江淮重工有限责任公司 | Counter-pressure casting process and counter-pressure casting equipment for lithium alloy castings |
| CN113996756A (en) * | 2021-10-28 | 2022-02-01 | 华中科技大学 | Preparation method of aluminum-lithium alloy based on graphite sand casting mold and product |
| CN113996759A (en) * | 2021-10-29 | 2022-02-01 | 华中科技大学 | Aluminum lithium alloy casting adopting shell to inhibit interface reaction and casting method thereof |
| CN114985673A (en) * | 2022-05-26 | 2022-09-02 | 华中科技大学 | Casting coating using lithium silicate as binder and suitable for sand casting of aluminum-lithium alloy |
| CN114985673B (en) * | 2022-05-26 | 2023-09-01 | 华中科技大学 | Casting coating with lithium silicate as binder and suitable for sand casting aluminum-lithium alloy |
| CN115255268A (en) * | 2022-06-10 | 2022-11-01 | 哈尔滨理工大学 | Non-compact casting mold based on porous structure |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
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Application publication date: 20200225 |