CN109158575A - A kind of anti-burning method of large size magnesium alloy pouring - Google Patents
A kind of anti-burning method of large size magnesium alloy pouring Download PDFInfo
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- CN109158575A CN109158575A CN201811066365.9A CN201811066365A CN109158575A CN 109158575 A CN109158575 A CN 109158575A CN 201811066365 A CN201811066365 A CN 201811066365A CN 109158575 A CN109158575 A CN 109158575A
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- CN
- China
- Prior art keywords
- sand
- kiln
- magnesium alloy
- sand mold
- aluminium alloy
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- 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.)
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Classifications
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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
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
- B22D21/04—Casting aluminium or magnesium
Abstract
The present invention relates to a kind of anti-burning methods of large-scale magnesium alloy pouring, it is combined using anti-combustion process with new fire proofing, by the gas forming amount for reducing sand mold, sand core, the exhaust capacity of raising type core, the fire-retardant atmosphere of increment type chamber simultaneously prevents the excessive scattered method of fire-retardant atmosphere, aluminium alloy, which fills type and aoxidizes, to be controlled, and the metallurgical quality of casting is improved, and effectively solves the problems, such as large size magnesium alloy pouring process combusts.
Description
Technical field
The present invention relates to a kind of anti-burning methods of magnesium alloy, the especially a kind of anti-burning method of large-scale magnesium alloy pouring.
Background technique
Mg alloy castings, especially for casting gross weight, i.e., the sum of casting weight and running gate system weight are in 150kg or more
Mg alloy castings, in casting process, sand mold, sand core are generated a large amount of oxidizing gas, this part by the baking of high temperature alloy liquid
Oxidizing gas contact with quick flowing aluminium alloy will occur vigorous oxidation reaction, and then High Temperature Magnesium Alloy liquid pole when causing to be poured
It is oxidizable, or even burning.
The existing anti-burning method of magnesium alloy cast mainly use sand mold, sand core warming up treatment and, limit ambient air humidity.With
Reduce the gas forming amount of sand mold, sand core, the moisture in removal sand mold, sand core.Avoid High Temperature Magnesium Alloy liquid and oxidizing gas and water
Acutely reflection occurs for steam.Current anti-burning method is single, and anti-flaming effect is not thorough, and can not be risen especially for large-scale Mg alloy castings
To thorough anti-flaming effect.
Summary of the invention
The present invention finds a kind of anti-burning method, effectively solves large-scale Mg alloy castings in casting process, the oxidation of generation
Combustion problem.
The technical solution of the invention is as follows, the large-scale anti-burning method of magnesium alloy pouring the following steps are included:
(1) it is required according to product drawing, designs foundary methods drawing；
(2) mold is manufactured by foundary methods drawing；
(3) it using the progress moulding of general sand and coremaking send, is subsequently placed in kiln and rises again, sand mold, sand core are risen again parameter
Are as follows: 210 ± 10 DEG C of heat preservation 6h ± 20min, blow 2h ± 10min after heat preservation starts 2h ± 10min, kiln of rising again after heat preservation
Power-off places kiln discharge after 2~3h in kiln, carries out a group type after continuing 2~3h of placement；
(4) during group type, the sand mold that enough contacts in Zu Xing in aluminium alloy, sand core surface are brushed lightly and spread sulphur powder, sprue cup
In equally brush lightly and spread sulphur powder, after group type, oxygen-proof film is covered above riser；
(5) to being passed through SF inside sand mold6With CO2Hybrid protection gas, in the protective gas, SF6Volumetric ratio be
Then 0.5%~2%, 15~30s of duration of ventilation are poured；
(6) crucible is moved at sprue cup, reaches 750 ± 5 DEG C to aluminium alloy temperature and start to be poured, while is closed in crucible
Golden liquid surface is brushed lightly every 10~15s spreads sulphur powder, until casting terminates；
(7) casting carries out knockout, cleaning and inspection after terminating 12h.
Specific effect of the invention is:
(1) sand mold, sand core warming up treatment, reduce the gas forming amount of sand mold, sand core, improve the gas permeability of sand mold, sand core,
Sand mold, the moisture in sand core are eliminated, and then avoids High Temperature Magnesium Alloy liquid and oxidizing gas and violent oxygen occurs for vapor
Change reflection.
(2) it brushes lightly and spreads sulphur powder, sulphur and oxygen and magnesium reflect under high temperature, consume Mg alloy surface oxygen, while on surface
Protective film is formed, starvation is contacted with magnesium alloy.
(3) oxygen-proof film is covered, the diffusion for avoiding protective gas is overflowed.
Therefore, the present invention is combined with new fire proofing using anti-combustion process, is got angry by reduction sand mold, sand core
Amount, the exhaust capacity of raising type core, the fire-retardant atmosphere of increment type chamber simultaneously prevent the excessive scattered method of fire-retardant atmosphere, and aluminium alloy fills type oxidation
It is controlled, improves the metallurgical quality of casting, effectively solve the problems, such as large-scale magnesium alloy pouring process combusts.
Specific embodiment
A kind of large size magnesium alloy pouring anti-burning method, the method the following steps are included:
(1) it is required according to product drawing, designs foundary methods drawing；
(2) mold is manufactured by foundary methods drawing；
(3) it using the progress moulding of general sand and coremaking send, is subsequently placed in kiln and rises again, sand mold, sand core are risen again parameter
Are as follows: 210 ± 10 DEG C of heat preservation 6h ± 20min, blow 2h ± 10min after heat preservation starts 2h ± 10min, kiln of rising again after heat preservation
Power-off places kiln discharge after 2~3h in kiln, carries out a group type after continuing 2~3h of placement；
(4) during group type, the sand mold that enough contacts in Zu Xing in aluminium alloy, sand core surface are brushed lightly and spread sulphur powder, sprue cup
In equally brush lightly and spread sulphur powder, after group type, oxygen-proof film is covered above riser；
(5) to being passed through SF inside sand mold6With CO2Hybrid protection gas, in the protective gas, SF6Volumetric ratio be
Then 0.5%~2%, 15~30s of duration of ventilation are poured；
(6) crucible is moved at sprue cup, reaches 750 ± 5 DEG C to aluminium alloy temperature and start to be poured, while is closed in crucible
Golden liquid surface is brushed lightly every 10~15s spreads sulphur powder, until casting terminates；
(7) casting carries out knockout, cleaning and inspection after terminating 12h.
Claims (1)
1. a kind of large size magnesium alloy pouring anti-burning method, which is characterized in that the method the following steps are included:
(1) it is required according to product drawing, designs foundary methods drawing；
(2) mold is manufactured by foundary methods drawing；
(3) it using the progress moulding of general sand and coremaking send, is subsequently placed in kiln and rises again, sand mold, sand core are risen again parameter are as follows:
210 ± 10 DEG C of heat preservation 6h ± 20min, blow 2h ± 10min after heat preservation starts 2h ± 10min, and kiln of rising again after heat preservation is disconnected
Electricity places kiln discharge after 2~3h in kiln, carries out a group type after continuing 2~3h of placement；
(4) during group type, the sand mold that enough contacts in Zu Xing in aluminium alloy, sand core surface are brushed lightly and spread sulphur powder, same in sprue cup
Sample, which is brushed lightly, spreads sulphur powder, and after group type, oxygen-proof film is covered above riser；
(5) to being passed through SF inside sand mold6With CO2Hybrid protection gas, in the protective gas, SF6Volumetric ratio be 0.5%
Then~2%, 15~30s of duration of ventilation are poured；
(6) crucible is moved at sprue cup, reaches 750 ± 5 DEG C to aluminium alloy temperature and start to be poured, while the aluminium alloy in crucible
Surface is brushed lightly every 10~15s and spreads sulphur powder, until casting terminates；
(7) casting carries out knockout, cleaning and inspection after terminating 12h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811066365.9A CN109158575A (en) | 2018-09-12 | 2018-09-12 | A kind of anti-burning method of large size magnesium alloy pouring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811066365.9A CN109158575A (en) | 2018-09-12 | 2018-09-12 | A kind of anti-burning method of large size magnesium alloy pouring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109158575A true CN109158575A (en) | 2019-01-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811066365.9A Pending CN109158575A (en) | 2018-09-12 | 2018-09-12 | A kind of anti-burning method of large size magnesium alloy pouring |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109967720A (en) * | 2019-04-26 | 2019-07-05 | 太原科技大学 | It is formed with the magnesium alloy cast device of cathodic protection |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106341997B (en) * | 2008-01-07 | 2012-02-22 | 哈尔滨东安发动机（集团）有限公司 | The anti-burning method of large-scale magnesium alloy cast |
| US8302657B2 (en) * | 2009-02-20 | 2012-11-06 | Constellium France | Casting process for aluminum alloys |
| CN105436409A (en) * | 2015-12-24 | 2016-03-30 | 西北工业大学 | Precision investment casting method for magnesium alloy |
-
2018
- 2018-09-12 CN CN201811066365.9A patent/CN109158575A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106341997B (en) * | 2008-01-07 | 2012-02-22 | 哈尔滨东安发动机（集团）有限公司 | The anti-burning method of large-scale magnesium alloy cast |
| US8302657B2 (en) * | 2009-02-20 | 2012-11-06 | Constellium France | Casting process for aluminum alloys |
| CN105436409A (en) * | 2015-12-24 | 2016-03-30 | 西北工业大学 | Precision investment casting method for magnesium alloy |
Non-Patent Citations (3)
| Title |
|---|
| 聂小武: "《实用有色合金铸造技术》", 31 January 2009, 辽宁科学技术出版社 * |
| 蔡增辉等: "镁合金铸件低压铸造过程中的防燃控制技术", 《铸造技术》 * |
| 陆树荪等: "《有色铸造合金及熔炼》", 31 May 1983, 国防工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109967720A (en) * | 2019-04-26 | 2019-07-05 | 太原科技大学 | It is formed with the magnesium alloy cast device of cathodic protection |
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Application publication date: 20190108 |
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