CN100333861C - High temperature gradient layer-by-layer solidifying continuously casting process - Google Patents
High temperature gradient layer-by-layer solidifying continuously casting process Download PDFInfo
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- CN100333861C CN100333861C CNB2005100295988A CN200510029598A CN100333861C CN 100333861 C CN100333861 C CN 100333861C CN B2005100295988 A CNB2005100295988 A CN B2005100295988A CN 200510029598 A CN200510029598 A CN 200510029598A CN 100333861 C CN100333861 C CN 100333861C
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Abstract
The present invention relates to a high temperature gradient layer-by-layer solidifying continuously casting method. The main characteristics are that: at the time of continuous casting, because molten metal injected in a continuous casting crystallizer system is affected by an alternating magnetic field generated by an induction heating device of alternating current, the temperature of the molten metal basically does not descend or descend slowly; because of magnetic agitating, the temperature in the medium radial direction of a liquid socket tends to be uniform; a high temperature gradient field is formed in an axial direction inside the continuous casting crystallizer system; therefore, alloy with monotectic reaction during continuous casting can effectively avoid the occurrence of gravity segregation. Compared with a traditional continuous casting method, the high temperature gradient layer-by-layer solidifying continuous casting method not only can enable the component of the solidified alloy to be uniform, effectively avoid the occurrence of the gravity segregation, but also is easy and simply applied on the technique.
Description
Technical field
The present invention relates to a kind of high temperature gradient layer-by-layer solidifying continuously casting process and continuous cast mold system thereof, belong to metal material continuous casting technology field.
Background technology
Alloy (copper base, aluminium base) with monotectic reaction, owing to exist mutually than great and the inconsistent low melting point of matrix, axial-temperature gradient owing to the crystallization and freezing zone with common continuous cast method the time is low, liquid point depth is big, it is very easily more poly-partially and gravity segregation takes place under the gravity effect than heavy phase (is the rich Bi phase that the alloy monotectic reaction generates as Al-Bi) greatly that monotectic reaction generates, and causes tissue odds to spare and can not satisfy instructions for use.Adopt soft-contact electromagnetic casting method (application number 01126717.8) though cc billet surface quality increases, but because it applies electromagnetic force in whole crystallization and freezing district, axial-temperature gradient is still lower, liquid point depth is big, what monotectic reaction generated greatly also can be poly-partially under the gravity effect than heavy phase, also can't effectively control the gravity segregation of strand.
Summary of the invention
The purpose of this invention is to provide a kind of high temperature gradient layer-by-layer solidifying continuously casting process.
Another object of the present invention provides a kind of continuous cast mold system that is used for high temperature gradient layer-by-layer solidifying continuously casting process.
Task of the present invention is achieved in that
A kind of high temperature gradient layer-by-layer solidifying continuously casting process mainly may further comprise the steps:
A. during continuous casting, in the tundish molten metal under stopper control in the mouth of a river enters the crystallizer neck bush, be subjected to the effect of the alternating magnetic field that induction heating apparatus produced of alternating current, the molten metal temperature that enters does not descend substantially or descends very slow, and, formed the hot junction of the axial high-temperature gradient of strand field above water mold owing to radial temperature in the electromagnetic stirr liquid cave is tending towards evenly;
B. at the strand of water mold to the zone of spraying water between the slit, force under the cooling molten metal temperature sharply to descend and solidify at cooling water, form the cold junction of the axial high-temperature gradient of strand field;
C. haulage gear is pulled out water mold with metal base, replenishes molten metal from tundish by the mouth of a river to the liquid cave of continuous cast mold system inner chamber simultaneously, has formed the continuous casting process of successively solidifying vertically of strand in axial high-temperature gradient field thus.
A kind of continuous cast mold system that is used for high temperature gradient layer-by-layer solidifying continuously casting process, by the crystallizer neck bush, water mold, magnetic masking layer between induction heating apparatus and water mold and induction heating apparatus is formed, it is characterized in that having in the described continuous cast mold system induction heating apparatus to be positioned at the top of crystallizer neck bush, and hard-pressed bale is in crystallizer neck bush periphery; Water mold is positioned at the bottom of crystallizer neck bush, and hard-pressed bale is in crystallizer neck bush periphery.The material of crystallizer neck bush is graphite or boron nitride, or refractory material, scribbles coating on it.The composition of coating can be graphite powder or talcum powder or mineral oil, or the mixture of above material.
Principle of the present invention is to apply induced-current in the molten metal above the continuous cast mold system.Utilize eddy current heating of metal liquid on the one hand.Utilize electromagnetic stirr reinforced metal heat convection on the other hand, thereby the metal base in crystallizer system axially forms a high-temperature gradient field, and the molten metal cave is shoaled, solidify and occur in the very narrow zone, thereby in casting process, realize successively solidifying.For example, to containing the aluminium alloy of Bi, because its monotectic reaction is carried out in very narrow zone, after rich Bi separated out mutually, matrix solidified very soon, with rich Bi phase anchored in place, thereby had avoided the generation of gravity segregation.
High temperature gradient layer-by-layer solidifying continuously casting process of the present invention is compared with traditional continuous cast method, can obtain higher axial high-temperature gradient in the solidification and crystallization zone of continuous casting, make the composition of solidified superalloy even, particularly, can avoid the generation of gravity segregation effectively to having the continuous casting of monotectic reaction alloy.This continuous cast method is compared in operation with traditional continuous cast method, and uncomplicated, and easy to control.
Description of drawings
Fig. 1 is a high temperature gradient layer-by-layer solidifying continuously casting method schematic diagram.
Each digital code is expressed as follows among the figure:
1. strand 12. water spray slits have been solidified in 5. liquid caves, 6. neck bush, 7. induction heating apparatuses, 8. magnetic masking layers, 9. water molds, 10. liquid-solid coexistence mushy zone 11. coolings of stopper 2. tundish 3. molten metals, 4. mouths of a river
Fig. 2 is the sampling point figure of sample during the Bi elementary analysis in the aluminium alloy bars of continuous casting.
The specific embodiment
Describe in detail according to basic principle of the present invention and performance below in conjunction with accompanying drawing 1.
Primary structure of the present invention is a crystallizer neck bush 6, water mold 9, and the magnetic masking layer 8 that induction heating apparatus 7 and water mold 9 and induction heating apparatus are 7 is formed.The material of crystallizer neck bush 6 is graphite or boron nitride, or refractory material, scribbles coating on it.The composition of coating can be graphite powder or talcum powder or mineral oil, or the mixture of above material.Being connected with its frequency of alternating current in the induction heating apparatus 7 is 1Hz to 300kHz; There is water spray slit 12 water mold 9 lower ends, and cooling water sprays to strand 11 and realizes the secondary cooling, and molten metal is solidified; During continuous casting, in tundish 2 molten metal 3 under stopper 1 control in the mouth of a river 4 enters crystallizer neck bush 6, be subjected to the effect of the alternating magnetic field that the induction heating apparatus 7 of alternating current produced, the molten metal temperature that enters does not descend substantially or descends very slow, and because electromagnetic stirr makes that radial temperature is tending towards evenly in the liquid cave 4, formed water mold 9 upper shaft to the hot junction of high-temperature gradient field; At the strand of crystallizer 9 to water spray 12 zones, slit, the molten metal temperature sharply descends and solidifies under cooling water is forced to cool off, and forms the cold junction of axial high-temperature gradient field.The metal base that haulage gear will solidify is pulled out water mold 9, to the liquid cave 5 of continuous cast mold system inner chamber, replenish molten metal from tundish 2 by the mouth of a river 4 simultaneously, formed the continuous casting process of successively solidifying vertically in the axial high-temperature gradient field in the continuous cast mold system thus.
See Table 1 with Bi elemental distribution in the aluminium-silicon-copper-bismuth alloy sample rod (the bismuth-containing amount is 2.65wt.%) of this method continuous casting, the sampling point of sample is seen Fig. 2 during the Bi elementary analysis.Be evenly distributed by Bi constituent content in the visible aluminum alloy sample rod of table 1.
The Bi element distributes in the aluminum alloy sample rod of table 1 continuous casting
| Sample 1 sampling point | The content of Bi (wt.%) | Sample 2 sampling points | The content of Bi (wt.%) |
| Continuous casting rod top | 2.72 | Continuous casting piece center | 2.68 |
| Continuous casting rod middle part | 2.64 | Continuous casting piece subcenter | 2.70 |
| Continuous casting rod bottom | 2.62 | Continuous casting piece outmost turns | 2.65 |
Claims (2)
1. high temperature gradient layer-by-layer solidifying continuously casting process mainly may further comprise the steps:
A. during continuous casting, in the tundish (2) molten metal (3) under stopper (1) control in the mouth of a river (4) enter crystallizer neck bush (6), be subjected to the effect of the alternating magnetic field that the induction heating apparatus (7) of alternating current produced, the molten metal temperature that enters does not descend substantially or descends very slow, and, formed the hot junction of the axial high-temperature gradient of strand field in water mold (9) top because the middle radial temperature in electromagnetic stirr liquid cave (5) is tending towards evenly;
B. at the strand of water mold (9) to zone between the slit of spraying water (12), the molten metal temperature sharply descends and solidifies under cooling water is forced to cool off, and forms the cold junction of the axial high-temperature gradient of strand field;
C. haulage gear is pulled out water mold (9) with metal base, to the liquid cave (5) of continuous cast mold system inner chamber, replenish molten metal from tundish (2) by the mouth of a river (4) simultaneously, formed the continuous casting process of vertically successively solidifying of strand in axial high-temperature gradient field thus.
2. continuous cast mold system that is used for the described high temperature gradient layer-by-layer solidifying continuously casting process of claim 1, by crystallizer neck bush (6), water mold (9), magnetic masking layer (8) between induction heating apparatus (7) and water mold (9) and induction heating apparatus (7) is formed, it is characterized in that having in the described continuous cast mold system induction heating apparatus to be positioned at the top of crystallizer neck bush, and hard-pressed bale is in crystallizer neck bush periphery; Water mold is positioned at the bottom of crystallizer neck bush, and hard-pressed bale is in crystallizer neck bush periphery; The material of crystallizer neck bush (6) is graphite or boron nitride, or refractory material, scribbles coating on it; The composition of coating can be graphite powder or talcum powder or mineral oil, or the mixture of above material.
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| CNB2005100295988A CN100333861C (en) | 2005-09-13 | 2005-09-13 | High temperature gradient layer-by-layer solidifying continuously casting process |
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| CNB2005100295988A CN100333861C (en) | 2005-09-13 | 2005-09-13 | High temperature gradient layer-by-layer solidifying continuously casting process |
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| CN100333861C true CN100333861C (en) | 2007-08-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114226756A (en) * | 2020-09-09 | 2022-03-25 | 上海交通大学 | Additive manufacturing device and additive manufacturing method |
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| CN100462164C (en) * | 2007-05-31 | 2009-02-18 | 武汉钢铁(集团)公司 | Flat blank continuous casting closed-top technology for preventing steel liquid roof-falling |
| US8056611B2 (en) * | 2008-10-06 | 2011-11-15 | Alcoa Inc. | Process and apparatus for direct chill casting |
| CN103122414A (en) * | 2011-11-18 | 2013-05-29 | 沈阳中德工具有限公司 | Split efficient energy-saving electroslag refining furnace |
| AT515244A2 (en) * | 2013-12-30 | 2015-07-15 | Inteco Special Melting Technologies Gmbh | Method for producing long ingots of large cross section |
| CN112605352B (en) * | 2020-10-27 | 2022-07-01 | 佛山市三水凤铝铝业有限公司 | Casting method of aluminum alloy cast rod |
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| JPH06277805A (en) * | 1993-03-29 | 1994-10-04 | Kawasaki Steel Corp | Apparatus for continuously casting steel |
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| CN1403229A (en) * | 2001-09-11 | 2003-03-19 | 上海上大众鑫科技发展有限公司 | Soft-contact electromagnetic continuous casting process of copper blank |
| CN1403230A (en) * | 2001-09-11 | 2003-03-19 | 上海上大众鑫科技发展有限公司 | Molten copper deoxidizing process in electromagnetic field |
| JP2004009064A (en) * | 2002-06-04 | 2004-01-15 | Jfe Steel Kk | Method for producing continuously cast slab |
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2005
- 2005-09-13 CN CNB2005100295988A patent/CN100333861C/en not_active Expired - Fee Related
Patent Citations (9)
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|---|---|---|---|---|
| US5375648A (en) * | 1992-09-04 | 1994-12-27 | Kawasaki Steel Corporation | Apparatus and method for continuous casting of steel |
| JPH06277805A (en) * | 1993-03-29 | 1994-10-04 | Kawasaki Steel Corp | Apparatus for continuously casting steel |
| CN1292740A (en) * | 1998-03-02 | 2001-04-25 | Abb股份有限公司 | Method for continuous casting and device for carrying out the method |
| CN1265945A (en) * | 1999-03-03 | 2000-09-13 | 新日本制铁株式会社 | Continuous casting equipment for molten metal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114226756A (en) * | 2020-09-09 | 2022-03-25 | 上海交通大学 | Additive manufacturing device and additive manufacturing method |
| CN114226756B (en) * | 2020-09-09 | 2023-06-16 | 上海交通大学 | Additive manufacturing method |
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Address after: 200444 Baoshan District Road, Shanghai, No. 99 Patentee after: Shanghai University Patentee after: SANDEN HUAYU AUTOMOTIVE AIR-CONDITIONING CO., LTD. Address before: 200444 Baoshan District Road, Shanghai, No. 99 Patentee before: Shanghai University Patentee before: Sandian Beier Automobile Air-Conditioner Co., Ltd., Shanghai |
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