CN102228961A - Heat preservation feeding method for magnesium alloy ingot casting - Google Patents
Heat preservation feeding method for magnesium alloy ingot casting Download PDFInfo
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- CN102228961A CN102228961A CN2011101693225A CN201110169322A CN102228961A CN 102228961 A CN102228961 A CN 102228961A CN 2011101693225 A CN2011101693225 A CN 2011101693225A CN 201110169322 A CN201110169322 A CN 201110169322A CN 102228961 A CN102228961 A CN 102228961A
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Abstract
The invention discloses a heat preservation feeding method for magnesium alloy ingot casting. The method comprises the following steps of: a) wetting carbon particles by using kerosene to acquire kerosene immersed carbon particles; and b) casting magnesium alloy melt into a die, immediately continuously scattering the kerosene immersed carbon particles prepared in the step a on the surface of the melt after casting is finished, controlling the height of the burning flame of the kerosene immersed carbon particles on the surface of the melt at 1 to 5 centimeters, and controlling the burning time of the kerosene immersed carbon particles on the surface of the melt in a range of 5 to 10 minutes. The cast magnesium alloy ingot in the solidification process is subjected to heat preservation feeding by using the properties that the kerosene is combustible and does not produce chemical reaction with the components in magnesium alloy and simultaneously using the properties of low heat conductivity and looseness of the carbon particles, so that shrinkage cavities and loose defects of the ingot are greatly reduced, and the quality of the ingot is effectively improved.
Description
Technical field
The present invention relates to metallurgical technology field, specially refer to a kind of insulation shrinkage compensation method of magnesium alloy ingot casting.
Background technology
Magnesium alloy has characteristics such as light weight, specific strength height, damping property and capability of electromagnetic shielding be good, has obtained application more and more widely in fields such as defence and military, the vehicles, 3C Products.The processing process of magnesium alloy ingot is melting, casting, and the magnesium alloy ingot after solidifying can be by follow-up extruding and the rolling magnesium alloy product of producing all size.Therefore, the quality of magnesium alloy ingot will influence the performance of subsequent product, and simultaneously, the recovery rate of magnesium alloy ingot also will produce bigger influence to cost.
A large amount of practice and theories show that the solidification shrinkage rate of magnesium alloy from the liquid phase to the solid phase is about 4%, are about 5% from the cubical contraction of high-temperature solid cool to room temperature.Therefore, magnesium alloy solidify with cooling procedure in contraction bigger, cause magnesium alloy ingot to be easy to form comparatively serious shrinkage cavity and rarefaction defect owing to feeding is untimely.Widely used cap pouring port can suppress shrinkage cavity and loose to a certain extent in steel casting though prior art has adopted, but, the density of magnesium alloy is little, thermal capacity is little, it is very fast to cause magnesium alloy to dispel the heat in process of setting, and magnesium alloy chemical character is active, easy oxidizing fire in casting cycle, the effect that makes common cap pouring port is not very outstanding.
Therefore, need to explore a kind of insulation shrinkage compensation method of magnesium alloy ingot casting, substitute the method for using the cap pouring port feeding in the prior art, after preventing to cast solidify with cooling procedure in the magnesium alloy fused mass oxidizing fire, and make the magnesium alloy in course of solidification better heat preservation, the feeding better effects if avoids occurring shrinkage cavity and loose, to improve the quality of magnesium alloy ingot.
Summary of the invention
In view of this, the invention provides a kind of insulation shrinkage compensation method of magnesium alloy ingot casting, this method utilize kerosene inflammable and not with magnesium alloy in the characteristic of composition generation chemical reaction, utilize carbon granules low heat conductivity and loose characteristic simultaneously, the magnesium alloy ingot that casting is finished in the after coagulation process is incubated feeding, reach and make ingot casting avoid occurring shrinkage cavity and loose, improve the purpose of ingot casting quality.
The insulation shrinkage compensation method of magnesium alloy ingot casting of the present invention may further comprise the steps:
A) use the wetting carbon granules of kerosene to obtain the immersion oil carbon granules;
B) magnesium alloy fused mass of in mould, casting, after finishing, casting continues to be sprinkled into equably the immersion oil carbon granules that makes among the step a to bath surface immediately, the immersion oil carbon granules is controlled between the 1-5cm at bath surface burned flame height, and the immersion oil carbon granules was controlled at 5-10 minute in the time of bath surface burning.
Further, described carbon granules is selected carbonization rice husk for use.
The beneficial effect of the invention: the insulation shrinkage compensation method of magnesium alloy ingot casting of the present invention has following advantage:
1) burning-point of kerosene is lower, in the high-temperature fusant surface combustion, near the air the bath surface is consumed, thereby forms separation layer between magnesium alloy fused mass surface and the air in casting die, can effectively prevent the oxidation and the burning of magnesium alloy fused mass; The heat that its burning produces also can play the effect of insulation.Simultaneously, kerosene not can with the common element generation chemical reactions such as Al, Zn in Mg and the magnesium alloy, can not cause the scaling loss of magnesium and alloying element.
2) carbon granules density is much smaller than magnesium alloy fused mass, and thermal conductivity is low, and porosity is higher.Therefore will float over the magnesium alloy fused mass surface after adding, play good insulation effect, effectively prevent the heat radiation and the cooling of magnesium alloy fused mass, thereby make the magnesium alloy fused mass near surface in the casting die be in liquid state all the time, the magnesium alloy that the casting die lower end has been solidified forms effective feeding effect.Simultaneously, carbon granules can not react with magnesium alloy fused mass, can not worsen the quality of magnesium alloy fused mass.
3) kerosene and the carbon granules final combustion product after fully is a carbon dioxide, do not produce residue substantially, and carbon dioxide also has certain refining effect to magnesium alloy.
4) selected carbonization rice husk lower cost for material is easy to obtain, and the specific shape of carbonization rice husk self makes its porosity height, and result of use is better.
The specific embodiment
Below will describe in detail the present invention:
Embodiment 1:
Melting AZ31 alloy, concrete composition is (mass percent): Mg:95.70%; Al:2.90%; Zn:1.10%; Mn, Fe, Si, Ni, Cu, Na are less than 0.30%.Melting is carried out in common crucible electrical resistance furnace or induction furnace.The AZ31 alloy is cast in 20 minutes mild steel mould of 200 ℃ of following preheatings, after casting finishes, evenly be sprinkled into the carbonization rice husk that is soaked with kerosene immediately, keeping kerosene and carbonization rice husk combustion flame height in the casting die is 1cm, continue to be sprinkled into carbonization rice husk and continue 5 minutes burning time with control, alloy solidifies fully.Certainly, burning-point be lower than melt temperature and not with other flammable liquids of magnesium and alloying component generation chemical reaction thereof, all can replace kerosene to carry out wetting to carbonization rice husk.
Solidify with cooling procedure steadily smooth, the shrinkage cavity and the rarefaction defect of check AZ31 ingot casting, qualification rate is 98%.
Embodiment 2:
Melting AZ61 alloy, concrete composition is (mass percent): Mg:92.70%; Al:5.90%; Zn:1.10%; Mn, Fe, Si, Ni, Cu, Na are less than 0.30%.Melting is carried out in common crucible electrical resistance furnace or induction furnace.The AZ61 alloy is cast in 20 minutes mild steel mould of 200 ℃ of following preheatings, after casting finishes, evenly be sprinkled into the immersion oil carbon granules that is soaked with kerosene immediately, keeping kerosene and carbon grain combustion flame height in the casting die is 3cm, continue to be sprinkled into the immersion oil carbon granules and continue 7 minutes burning time with control, alloy solidifies fully.
Solidify with cooling procedure steadily smooth, the shrinkage cavity and the rarefaction defect of check AZ61 ingot casting, qualification rate is 99%.
Embodiment 3:
Melting AZ91 alloy, concrete composition is (mass percent): Mg:89.70%; Al:8.90%; Zn:1.10%; Mn, Fe, Si, Ni, Cu, Na are less than 0.30%.Melting is carried out in common crucible electrical resistance furnace or induction furnace.The AZ91 alloy is cast in 20 minutes mild steel mould of 200 ℃ of following preheatings, after casting finishes, evenly be sprinkled into the carbonization rice husk that is soaked with kerosene immediately, keeping kerosene and carbonization rice husk combustion flame height in the casting die is 5cm, continue to be sprinkled into the immersion oil carbon granules and continue 10 minutes burning time with control, alloy solidifies fully.
Solidify with cooling procedure steadily smooth, the shrinkage cavity and the rarefaction defect of check gained AZ91 ingot casting, qualification rate is 96%.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (2)
1. the insulation shrinkage compensation method of magnesium alloy ingot casting is characterized in that: may further comprise the steps:
A) use the wetting carbon granules of kerosene to obtain the immersion oil carbon granules;
B) magnesium alloy fused mass of in mould, casting, after finishing, casting continues to be sprinkled into equably the immersion oil carbon granules that makes among the step a to bath surface immediately, the immersion oil carbon granules is controlled between the 1-5cm at bath surface burned flame height, and the immersion oil carbon granules was controlled at 5-10 minute in the time of bath surface burning.
2. the insulation shrinkage compensation method of magnesium alloy ingot casting according to claim 1, it is characterized in that: described carbon granules is selected carbonization rice husk for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110169322 CN102228961B (en) | 2011-06-22 | 2011-06-22 | Heat preservation feeding method for magnesium alloy ingot casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110169322 CN102228961B (en) | 2011-06-22 | 2011-06-22 | Heat preservation feeding method for magnesium alloy ingot casting |
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| Publication Number | Publication Date |
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| CN102228961A true CN102228961A (en) | 2011-11-02 |
| CN102228961B CN102228961B (en) | 2013-02-27 |
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| CN 201110169322 Expired - Fee Related CN102228961B (en) | 2011-06-22 | 2011-06-22 | Heat preservation feeding method for magnesium alloy ingot casting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107803464A (en) * | 2017-10-13 | 2018-03-16 | 江苏捷帝机器人股份有限公司 | A kind of low energy consumption sand casting technique |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400325A (en) * | 2001-07-31 | 2003-03-05 | 龙思远 | Method for fire-resisting protection for smelting magnesium alloy |
| EP1598131A1 (en) * | 2003-02-28 | 2005-11-23 | Taiyo Nippon Sanso Corporation | Molten metal treating agent, method of treating molten metal, apparatus and method for supplying covering gas for molten metal |
| JP2006057125A (en) * | 2004-08-18 | 2006-03-02 | Yamaguchi Univ | Clathrate compound, production method of clathrate compound, and thermoelectric conversion element |
| JP2010077516A (en) * | 2008-09-29 | 2010-04-08 | Toyota Central R&D Labs Inc | Magnesium alloy |
| CN101928847A (en) * | 2010-08-31 | 2010-12-29 | 山东省科学院新材料研究所 | Process for smelting magnesium alloy |
-
2011
- 2011-06-22 CN CN 201110169322 patent/CN102228961B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400325A (en) * | 2001-07-31 | 2003-03-05 | 龙思远 | Method for fire-resisting protection for smelting magnesium alloy |
| EP1598131A1 (en) * | 2003-02-28 | 2005-11-23 | Taiyo Nippon Sanso Corporation | Molten metal treating agent, method of treating molten metal, apparatus and method for supplying covering gas for molten metal |
| JP2006057125A (en) * | 2004-08-18 | 2006-03-02 | Yamaguchi Univ | Clathrate compound, production method of clathrate compound, and thermoelectric conversion element |
| JP2010077516A (en) * | 2008-09-29 | 2010-04-08 | Toyota Central R&D Labs Inc | Magnesium alloy |
| CN101928847A (en) * | 2010-08-31 | 2010-12-29 | 山东省科学院新材料研究所 | Process for smelting magnesium alloy |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107803464A (en) * | 2017-10-13 | 2018-03-16 | 江苏捷帝机器人股份有限公司 | A kind of low energy consumption sand casting technique |
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| CN102228961B (en) | 2013-02-27 |
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Owner name: QINGHAI SANGLOW MEGNESIUM CO., LTD. Free format text: FORMER OWNER: CHONGQING UNIVERSITY Effective date: 20140414 |
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Effective date of registration: 20140414 Address after: 810007 No. 6, Dongxin Road, Xining economic and Technological Development Zone, Qinghai, China Patentee after: Qinghai Sunglow Magnesium Co., Ltd. Address before: 400044 Shapingba District Sha Street, No. 174, Chongqing Patentee before: Chongqing University |
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