CN102228961B - Insulation Feeding Method for Magnesium Alloy Ingot Casting - Google Patents
Insulation Feeding Method for Magnesium Alloy Ingot Casting Download PDFInfo
- Publication number
- CN102228961B CN102228961B CN 201110169322 CN201110169322A CN102228961B CN 102228961 B CN102228961 B CN 102228961B CN 201110169322 CN201110169322 CN 201110169322 CN 201110169322 A CN201110169322 A CN 201110169322A CN 102228961 B CN102228961 B CN 102228961B
- Authority
- CN
- China
- Prior art keywords
- magnesium alloy
- carbon particles
- kerosene
- casting
- melt
- 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.)
- Expired - Fee Related
Links
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 44
- 238000005266 casting Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000009413 insulation Methods 0.000 title claims description 10
- 239000003350 kerosene Substances 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 238000004321 preservation Methods 0.000 claims abstract description 4
- 238000009736 wetting Methods 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims abstract 12
- 239000000155 melt Substances 0.000 claims abstract 5
- 235000007164 Oryza sativa Nutrition 0.000 claims description 10
- 239000010903 husk Substances 0.000 claims description 10
- 235000009566 rice Nutrition 0.000 claims description 10
- 240000007594 Oryza sativa Species 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000007711 solidification Methods 0.000 abstract description 3
- 230000008023 solidification Effects 0.000 abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 13
- 241000209094 Oryza Species 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000000956 alloy Substances 0.000 description 9
- 238000003763 carbonization Methods 0.000 description 9
- 238000002485 combustion reaction Methods 0.000 description 8
- 238000007654 immersion Methods 0.000 description 7
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 239000011777 magnesium Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical group O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 238000012797 qualification Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000003031 feeding effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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- Continuous Casting (AREA)
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 themelt 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
The characteristics such as magnesium alloy has that light weight, specific strength are high, damping property and capability of electromagnetic shielding are good obtain using 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 affect the performance of subsequent product, and simultaneously, the recovery rate of magnesium alloy ingot also will produce larger impact 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 larger, cause magnesium alloy ingot to be easy to form owing to feeding is untimely comparatively serious shrinkage cavity and rarefaction defect.Widely used cap pouring port can suppress shrinkage cavity and loose to a certain extent in steel casting although 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 to give prominence to very much.
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 from casting 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, the method utilize kerosene inflammable and not with magnesium alloy in the characteristic of composition generation chemical reaction, utilize simultaneously carbon granules low heat conductivity and loose characteristic, 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 casting in the mould, 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 is controlled at 5-10 minute in the time of bath surface burning.
Further, described carbon granules is selected carbonization rice husk.
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 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 Mg and magnesium alloy in the common element generation chemical reactions such as Al, Zn, 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 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 all the time liquid state, 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 carbon dioxide, substantially do not produce residue, 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 high, 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 casting is arrived in 20 minutes mild steel mould of 200 ℃ of lower preheatings, after casting finishes, evenly be sprinkled into immediately the carbonization rice husk that is soaked with kerosene, keeping kerosene and carbonization rice husk Combustion flame height in the casting die is 1cm, continue to be sprinkled into carbonization rice husk with control combustion time remaining 5 minutes, 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, 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 casting is arrived in 20 minutes mild steel mould of 200 ℃ of lower preheatings, after casting finishes, evenly be sprinkled into immediately the immersion oil carbon granules that is soaked with kerosene, keeping kerosene and carbon grain combustion flame height in the casting die is 3cm, continue to be sprinkled into the immersion oil carbon granules with control combustion time remaining 7 minutes, alloy solidifies fully.
Solidify with cooling procedure steadily smooth, 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 casting is arrived in 20 minutes mild steel mould of 200 ℃ of lower preheatings, after casting finishes, evenly be sprinkled into immediately the carbonization rice husk that is soaked with kerosene, 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 with control combustion time remaining 10 minutes, alloy solidifies fully.
Solidify with cooling procedure steadily smooth, 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 with reference to preferred embodiment the present invention is had been described in detail, 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 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)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110169322 CN102228961B (en) | 2011-06-22 | 2011-06-22 | Insulation Feeding Method for Magnesium Alloy Ingot Casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110169322 CN102228961B (en) | 2011-06-22 | 2011-06-22 | Insulation Feeding Method for Magnesium Alloy Ingot Casting |
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| Publication Number | Publication Date |
|---|---|
| CN102228961A CN102228961A (en) | 2011-11-02 |
| CN102228961B true CN102228961B (en) | 2013-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110169322 Expired - Fee Related CN102228961B (en) | 2011-06-22 | 2011-06-22 | Insulation Feeding Method for Magnesium Alloy Ingot Casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1132949C (en) * | 2001-07-31 | 2003-12-31 | 龙思远 | Method for fire-resisting protection for smelting magnesium alloy |
| CA2516996C (en) * | 2003-02-28 | 2009-12-15 | Taiyo Nippon Sanso Corporation | Molten metal treatment,method for treating molten metal, and apparatus and method for feeding cover gas to molten metal |
| JP2006057125A (en) * | 2004-08-18 | 2006-03-02 | Yamaguchi Univ | Clathrate compound, method for producing clathrate compound and thermoelectric conversion element |
| JP4852082B2 (en) * | 2008-09-29 | 2012-01-11 | 株式会社豊田中央研究所 | Magnesium alloy |
| CN101928847B (en) * | 2010-08-31 | 2012-05-30 | 山东省科学院新材料研究所 | A kind of magnesium alloy smelting process |
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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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| CF01 | Termination of patent right due to non-payment of annual fee |
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