CN100581681C - Oil lubricating electromagnetic vertical type semi-continuous casting method and crystallizer of magnesium alloy ingot blank - Google Patents
Oil lubricating electromagnetic vertical type semi-continuous casting method and crystallizer of magnesium alloy ingot blank Download PDFInfo
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- CN100581681C CN100581681C CN200810010647A CN200810010647A CN100581681C CN 100581681 C CN100581681 C CN 100581681C CN 200810010647 A CN200810010647 A CN 200810010647A CN 200810010647 A CN200810010647 A CN 200810010647A CN 100581681 C CN100581681 C CN 100581681C
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Abstract
An oily electro-magnetism vertical type semi-continuous casting process for a magnesium alloy ingot blank and a crystallizer are disclosed. The crystallizer comprises a metal liner, a cooling system, an excitation winding, a splash ring and a cover gas ring. The metal liner is disposed at the center of crystallizer. A cavity cooling system is disposed out of the metal liner. The excitation winding is disposed at the lower part in the cooling water cavity. A splash ring is disposed at the upper edge of the crystallizer liner. A cover gas ring is disposed above the splash ring. The invented method comprises following steps: coating a thin layer of lubricant oil on the inner wall of the metal liner, starting the crystallizer cooling system; then starting the low frequency generation power source to supply low frequency alternating current to the excitation winding; inducing the magnesium alloy fluid into the shunting disk disposed in the center of the liner; opening the cover gas ring; starting the casting machine and adjusting the crystallizer liquid level to be stable after the magnesium alloy fluid fills the top of the dummy ingot head; enlarging the cooling water flow, opening and adjusting control valve for controlling the splash ring. The invented proves can improve the surface quality of the magnesium alloy ingot blank, reduce surface turning quantity thereof, and increase casting speed thereof.
Description
Technical field
The invention belongs to the light-alloy casting technical field, particularly a kind of in the semicontinuous vertical casting technology of low frequency electromagnetic, adopt with cunning all-metal in the cover crystallizer system realize vertical type semi-continuous casting method and the equipment that the great surface quality magnesium alloy ingot blank is produced.
Background technology
In the tradition semicontinuous casting technique, owing between molten metal and metal initial scull and the inner metal sleeve bigger radially normal pressure is arranged under the high temperature, therefore bigger interface friction resistance is arranged, and owing to be easy to come in contact the formula adhesion between molten metal and the interior cover wall, for magnesium alloy, the adhesion degree is even more serious, even reacting property adhesion easily, these have all increased the weight of the cut on ingot blank surface, and these cuts generally all are radially to go deep into ingot blank inside, significantly increase the turning amount of ingot blank, reduce lumber recovery.Make for hot direct casting, because the high response between magnesium liquid and the hot top, the easier generation of this reactive adhesion, not only reduced surface quality, and, be easy to embed the ingot blank top layer even enter molten metal also strengthened the required turning amount of ingot blank because the hot top efflorescence product that reaction is caused floats from the interface.The amount of the ingot blank of magnesium alloy ingot blank manufacturing enterprise surface turning at present is generally up to radius 8mm～15mm, even more, and the turning rate reaches 10%～20%, adds that (excision amount 250mm～300mm), lumber recovery has only 70%～80%, and is quite low end to end in excision.Therefore, the surface quality that improves magnesium alloy ingot blank reduces production costs for improving the ingot blank lumber recovery, and it is most important to improve the business economic benefit.
Numerous researchs all show, applying magnetic field (comprising permanent magnetic field, electromagnetic field, pulse electromagnetic field, combined electric magnetic field etc.) when solidifying all exerts an influence to temperature field, flow field, concentration field and the forming core of alloy liquid in the DC casting process and the behavior of solidifying such as grow up, reach even tissueization, grain refinement, gross segregation effect such as be inhibited, thereby significantly improve the metallurgical quality of semi-continuous casting ingot blank.Simultaneously, under the effect of electromagnetic force radial component, the molten metal in the crystallizer is pushed to the center, forms significant meniscus, reduced molten metal and crystallizer inner metal sleeve contact pressure, therefore applying electromagnetic field also can play good effect to the raising of ingot blank surface quality.But, owing between molten metal and the inner metal sleeve bigger radially normal pressure is arranged still under the high temperature, thereby still have bigger frictional resistance, so be difficult to avoid fully the adhesion between molten metal and the interior cover wall.For magnesium alloy, the adhesion degree is even more serious, and these have all increased the weight of the cut on ingot blank surface, and these cuts generally all are radially to go deep into ingot blank inside, significantly increases the turning amount of ingot blank.In addition, the semicontinuous vertical casting of the low frequency electromagnetic of magnesium alloy generally adopts the heat top to add the crystallizer system (seeing CN1216707) of graphite annulus structure, owing to hot top and graphite annulus poor durability, has increased cost consumption; Simultaneously, although because the low casting liquid cave that has applied due to the low frequency electromagnetic field can increase substantially casting speed, in general, the casting speed of hot top formula mould casting system is not high.And the inner metal sleeve crystallizer system is owing to there is very strong once cooling, objectively require to adopt higher casting speed, otherwise can make casting process be difficult to continue owing to " embracing core " effect, but generally all has very dark liquid cave this moment, ingot blank central tissue is thick, gross segregation is serious, and metallurgical quality is poor.
Summary of the invention
Not fully up to expectations at present magnesium alloy ingot blank surface quality, cause surperficial turning amount big, problem such as lumber recovery is low the invention provides a kind of cunning electromagnetic vertical type semi-continuous casting method and crystallizer of magnesium alloy ingot blank.
Crystallizer of the present invention comprises inner metal sleeve, cooling system, magnet exciting coil, splash ring and protection compression ring; inner metal sleeve is in the center of crystallizer; it outside inner metal sleeve the cavity cooling system that cooling water tank and baffle plate constitute; the bottom is provided with magnet exciting coil in cooling water cavity; upper edge at inner metal sleeve is provided with oil ring, is equipped with the protection compression ring above oil ring.Inner metal sleeve is that vertical cylinder type or its latter half has 3～10 ° opening degree.Cooling system is provided with water inlet, and the magnet exciting coil that is located in the cooling water cavity soaks the end in cooling water, and magnet exciting coil joins with the low-frequency power that is located at the crystallizer outside.Oil ring is made of cavity of resorption and loam cake, the oil ring cavity of resorption is provided with 3 grooves and constitutes 3 accumulators with loam cake, is communicated with by some breach between the accumulator, and a tip degree is arranged in the upper edge of oil ring cavity of resorption, leave the oil seam between oil ring cavity of resorption and the loam cake, the oil ring oil supply system outer with being located at crystallizer communicates; The protection compression ring is provided with the outlet of protection gas.
The crystallizer that method of the present invention adopts the cunning electromagnetic vertical type semi-continuous casting of aforementioned magnesium alloy ingot blank to use, carry out according to the following steps:
(1) at first coat thin layer lubricating oil at the inner metal sleeve inwall, the centering dummy bar head is opened the crystallizer cooling system, and the control cooling water flow is the cooling magnet exciting coil earlier;
(2) open low frequency generation power supply, to the logical low frequency ac of magnet exciting coil, for crystallizer provides low frequency electromagnetic field; Or one group of logical low frequency ac during two groups of magnet exciting coils, the logical simultaneously direct current of another group is for crystallizer provides the low frequency electromagnetic oscillation field; Make electromagnetic field reach setting value 2000AT～40000AT; The electromagnetic field that applies is a low frequency electromagnetic field, and frequency range is 1Hz～90Hz, and the electromagnetic field intensity at crystallizer center was 10mT～200mT when crystallizer was unloaded, and the direct solenoid induction is 5～100mT;
(3) liquid magnesium alloy is introduced the shunting disk place inner metal sleeve heart portion, by entering after the shunting disk shunting in the inner metal sleeve of crystallizer and the space that dummy bar head is formed, unlatching simultaneously protects compression ring to provide gas shield for liquid magnesium alloy;
(4) treat that liquid magnesium alloy is full of the dummy bar head top, liquid level rises near behind the normal casting height, starts casting machine and regulates and control mold liquid level to stable by setting casting speed.Set casting speed according to alloy designations and ingot blank specification and different, be generally 50～300mm/min;
(5) strengthen cooling water flow, open with the by-pass valve control of regulating the control oil ring and provide continuous lubrication for the inner metal sleeve inwall.
Apply low frequency electromagnetic field in the crystallizer system that the present invention overlaps in complete metal, and adopt the continuous oil supply mode to realize the lubricated of inner metal sleeve wall, realize combine (accompanying drawing 1) of low frequency electromagnetic casting and inner metal sleeve crystallizer system, reach both mutual supplement with each other's advantages.At the melt of the resistance electromagnetic surface due to pressure of casting process medium and low frequency electromagnetic field and the soft Contact Effect of crystallizer inwall, greatly reduce interface contact pressure, the more important thing is and promoted the infiltration of lubricant between melt and inner metal sleeve inwall, thereby be easy to make the continuous lubricating oil rete of formation between melt and the interior cover, greatly reduce the coefficient of sliding friction at interface, can also adopt the Lower Half inwall to have of the friction of the inner metal sleeve of certain opening degree simultaneously with initial scull of further reduction and interior cover.The reduction of the interface contact pressure and the coefficient of sliding friction is all played good action to the reduction of interface friction force, thereby causes significantly improving of ingot blank surface quality.And the formation of continuous lubrication oil lamella, then can reduce the heat conduction flux of magnesium liquid by the crystallizer inwall, effectively reduced a cooling effect of inner metal sleeve, reduced initial scull thickness and reduce initial solidification point height, this helps strengthening the soft contact effect of electromagnetism.Both mutually promote, and in conjunction with specially designed protection gas feed system, can realize the production and the preparation of the magnesium alloy ingot blank that surface quality is very good.
Simultaneously, low frequency electromagnetic field has reduced the radial symmetry gradient that ingot blank solidifies by the change of stream field, has reduced the solidification liquid acupoint depth, has improved the internal metallurgical quality of the ingot blank that cover crystallizer system casting technique is produced in traditional all-metal; The cover crystallizer system has then avoided the general hot direct casting of adopting of low frequency electromagnetic casting to make the relative low speed and the high defective of casting cost (hot top consumption) of crystallizer system in the all-metal, and can significantly improve the casting speed of low frequency electromagnetic casting technology.The existence of interior cover wall oil film also helps promoting the convection current scope and the intensity of alloy liquid in the liquid cave, also helps strengthening simultaneously the electromagnetic fining effect.Therefore, the process of this research also can realize the high speed high-quality casting of magnesium alloy ingot blank, and can reduce the casting consumables cost.
Therefore; the present invention is by the optimal design of crystallizer system; realized the combination of electromagnetism, cunning, water-cooled, protection gas; can greatly improve the surface quality of magnesium alloy ingot blank; reduce the surperficial turning amount of magnesium alloy ingot blank significantly; simultaneously can significantly improve casting speed, raise labour productivity.
Description of drawings
Fig. 1 is a cunning low frequency electromagnetic semi-continuous casting crystallizer system structural representation of the present invention;
Fig. 2 is the oil ring of cunning low frequency electromagnetic semi-continuous casting crystallizer of the present invention and the part-structure schematic diagram of protection compression ring;
Fig. 3 is the structural representation of cunning low frequency electromagnetic semi-continuous casting crystallizer inner metal sleeve of the present invention;
Fig. 4 is low level magnet exciting coil of the present invention formed liquid cave and convection current vortex shape schematic diagram;
Among the figure, 1 tank lid, at the bottom of 2 water tanks, 3 water fenders; 4 inner metal sleeves, 5 secondary cooling waters seam, 6 oil rings, 7 protection compression rings; 8 magnet exciting coils, 9 water inlets, the contact point of 10 interior cover upper edges and oil ring, 11 oil ring cavity of resorptions; 12 oil ring loam cakes, 13 protection compression rings are gone to the bottom, 14 protection compression ring loam cakes; 15 oil seams, 16 inner metal sleeve inwalls, 17 shunting disks; 18 meniscus, 19 lubricating oil films, 20 liquid-solid phase regional boundary faces.
Fig. 5 is the surface characteristics comparison diagram of the AZ80 magnesium alloy ingot blank of employing the inventive method and the preparation of traditional DC casting method;
Wherein: (a) for adopting traditional DC casting method preparation, (b) for adopting the inventive method casting preparation
Fig. 6 is for adopting several typical surface features comparison diagrams that added the AZ80 magnesium alloy ingot blank of ignition-proof element of the inventive method preparation;
Wherein: (a) being AZ80+20ppmBe, (b) is AZ80+0.2%Y, (c) is AZ80+0.5%Y
Fig. 7 is electromagnetic field and cunning contrast figure to the influence of ingot blank surface quality;
Wherein: (a) cunning influence to DC casting ingot blank surface, (b) electromagnetism is to the influence on cunning casting ingot blank surface
Fig. 8 is the effect schematic diagram of the magnesium alloy ingot blank turning amount of employing the inventive method casting.
Wherein: (a) Φ 244mmAZ80 turning amount R=2mm, (b) Φ 100mmAZ31 turning amount R=1mm
(c) Φ 160mm GW103K magnesium alloy turning amount R=0.5～1.5mm
The specific embodiment
Crystallizer of the present invention as shown in Figure 1, the interior cover 4 of its crystallizer is made for all-metal, 1～2 magnet exciting coil 8 place by at the bottom of tank lid 1, the water tank 2 and the crystallizer secondary cooling water water cavity that surrounds of water fender 3 in portion on the lower side.Cover 4 places the crystallizer centre bore in the all-metal, and inner metal sleeve 4 is 3～10 ° a opening degree for vertical cylinder type or its latter half have the angle of inclination, as shown in Figure 3.Oil ring 6 places the upper edge of crystallizer inner metal sleeve 4, is provided with protection compression ring 7 above oil ring 6.Secondary cooling water enters water cavity inside by water inlet 9, via water fender 3 upper edges, is ejected into the ingot blank surface by secondary cooling water seam 5 again.The effect of water fender 3 is that magnet exciting coil 8 can soak the end in cooling water, does not take place because of overheated its insulating barrier that destroys.Lubricating system adopts has fine rigidity and the good stainless steel manufacturing of magnetic permeability energy, and Yin Gaowen does not deform in casting process, and is also less to the weakening effect of electromagnetic field simultaneously.Oil ring is made of oil ring cavity of resorption 11 and loam cake 12, constitutes A, B, three ring-type accumulators of C by three grooves and the loam cake of oil ring cavity of resorption 11, between be communicated with by several breach, as shown in Figure 2.Lubricating oil enters the B chamber by the A chamber, enters the C chamber again, is entered the sloping platform D of oil ring cavity of resorption 11 upper edges then by oil seam 15, enters the sloping platform E of inner metal sleeve upper edge again, can effectively guarantee the even distribution of lubricating oil like this.The protection compression ring also by go to the bottom 13 and loam cake 14 constitute, protection gas outlet size and gradient will can guarantee the effective covering of gas on liquid level.Oil supply system generally adopts liquid level difference to realize fuel feeding, also can adopt little pumping plant pressing mode to realize fuel feeding.Cover 4 all can easily remove and install in the all-metal in oil ring 6 and protection compression ring 7 and the crystallizer, is convenient to the maintenance and repair of system.The basic skills of ingot blank casting is that liquid magnesium alloy is introduced in the space of inner metal sleeve and dummy bar head composition; provide gas shield by the protection compression ring for liquid magnesium alloy; for the inner metal sleeve inwall provides lubricated, place the logical low frequency ac of magnet exciting coil of crystallizer secondary cooling water water cavity inside or direct current to provide electromagnetic field by the oil ring system at inner metal sleeve top for the liquid magnesium alloy of crystallizer.
Fig. 4 is low level magnet exciting coil formed liquid cave and convection current vortex shape schematic diagram.As seen, because the magnet exciting coil position is near the crystallizer bottom, the vortex center that electromagnetic field causes is near bottom, liquid cave, can make the magnesium liquid of bottom, liquid cave and the magnesium liquid of pasty state two-phase section obtain the stirring of convection current fully, and it is less near the magnesium liquid agitation speed of meniscus, thereby make and realize in the liquid cave effect of " surface is calm, below waves surging turbulently ".The oxide-film that this structure can be avoided increasing the weight of liquid level owing to vortex destroys, and can strengthen the fragmentation and the drift of bottom, liquid cave primary dendrite again.To improving the ingot blank surface quality and optimizing the ingot blank interior tissue all is considerable.
The crystallizer that method of the present invention adopts the cunning electromagnetic vertical type semi-continuous casting of aforementioned magnesium alloy ingot blank to use, concrete operations are to finish magnesium alloy smelting and purification work, and finish crystallizer system installation, inner metal sleeve inwall oiling (smearing skim lubricating oil in advance) and dummy bar head to after the medium relevant preparation, open the secondary water-cooling system (can control the less water yield, main purpose is the magnet exciting coil that cooling places the secondary waterway) of crystallizer; Open low frequency generation power supply, for the logical low frequency ac of magnet exciting coil, for crystallizer system provides low frequency electromagnetic field; Or (another group two groups the time passes to direct current simultaneously, for crystallizer system provides the low frequency electromagnetic oscillation field); Treat that electromagnetic field reaches after the setting value, by drainage tube (power be in the close crucible that causes of electronic infusion pump or air pump with the positive differential pressure of atmosphere.Flow adopt to be regulated the infusion pump flow or is regulated pressure reduction and jointly controls with cursory) the liquid magnesium alloy introducing is placed the shunting disk of inner metal sleeve heart portion, by entering after the shunting disk shunting in the inner metal sleeve of crystallizer and the space that dummy bar head is formed, unlatching simultaneously protects compression ring to provide gas shield for liquid magnesium alloy; Treat that liquid magnesium alloy is full of the dummy bar head top and liquid level rises near behind the normal casting height, start casting machine and regulate and control mold liquid level by setting casting speed; After the liquid level stabilizing, strengthen the secondary cooling water flow to normal value, and open with the by-pass valve control of regulating oil ring and provide continuous lubrication (lubricating oil can lean on liquid level difference fuel feeding also can be with the oil pump fuel feeding that pressurizes), thereby the cunning low frequency electromagnetic vertical semi-continuous casting of realization magnesium alloy for the inner metal sleeve inwall.Fig. 7 is electromagnetic field and cunning impact effect comparison to the ingot blank surface quality.As seen, cunning and electromagnetic field is contributed the raising of ingot blank surface quality jointly.Fig. 5 is the surface characteristics contrast of the AZ80 magnesium alloy ingot blank of the inventive method and the preparation of traditional DC casting method.As seen, the surface quality of the magnesium alloy ingot blank of method preparation of the present invention obviously is better than conventional cast.
The present invention is suitable for casting the production of the magnesium alloy slab of the magnesium alloy circle base of Φ 100mm～Φ 500mm and all size.Simultaneously, also can be used for as other light metals and the round base of alloy or the preparations of square billet such as aluminium.The manufacturing of the general employing of cover forging aluminium alloy also can be adopted magnetic stainless steel or titanium and alloy manufacturing thereof in the all-metal in the crystallizer.Oil ring and protection compression ring adopt the manufacturing of magnetic stainless steel.Used lubricant is that industrial castor oil or industrial coconut wet goods at room temperature have adequate liquidity and have the higher grease of phosphorus content of less oil smoke when contacting with liquid magnesium alloy.Protective gas adopts CO
2+ (0.5～5) vol%SF
6Mist.
The low frequency electromagnetic frequency range that is applied in crystallizer is 1Hz～90Hz, and the low frequency magnetic field intensity of magnet exciting coil is 2000AT～40000AT; The low frequency electromagnetic oscillation frequency range that is perhaps applied is 1Hz～90Hz, and low frequency electromagnetic intensity is 2000AT～40000AT, and static magnetic field strength is 1500AT～30000AT.When dummy bar head entered inner metal sleeve and do not have magnesium liquid, the alternating electromagnetic induction of crystallizer inner metal sleeve lower edge reached 10～200mT, and the direct solenoid induction reaches 5～100mT.Cooling water flow, flow of lubrication and shield gas flow rate are specifically determined according to alloy designations, casting speed, ingot blank specification.Principle is that cooling water flow should guarantee enough secondary intensities of cooling and not cause that the ingot blank hot tearing takes place; Flow of lubrication will guarantee that liquid magnesium alloy and inner metal sleeve inwall do not stick together the burning of lubricating oil not take place because of oil mass is excessive simultaneously; Protection gas will guarantee that then the liquid magnesium alloy surface keeps the excellent protection film.Fig. 6 shows that the ingot blank surface characteristics behind the magnesium alloy interpolation ignition-proof element is difference to some extent, but shows that the turning amount does not have significant difference.Fig. 8 is the several application effect example of the inventive method.As seen, for the magnesium alloy ingot blank of the different size and the trade mark, method of the present invention all can reach the effect of the dolly amount of cutting.
Advantage of the present invention is to adopt low frequency electromagnetic field and the combination that applies cover crystallizer system in the cunning all-metal, greatly reduce the frictional force between liquid magnesium alloy and the inner metal sleeve, significantly improved the surface quality of ingot blank, ingot blank surface turning amount is reduced to 1mm～5mm (the turning rate is 4～8%) by the 5mm～10mm (the turning rate is 9%～18%) of traditional DC casting, the reduction amplitude reaches more than 50%, can significantly reduce production costs.Simultaneously, because that crystallizer has adopted is cunning in conjunction with Analysis of Nested Design in the metal, and because the liquid cave that significantly shoals during electromagnetic casting makes casting speed be significantly improved, increase rate reaches 1.4～2.3 times.
Following table prepares the ingot blank of different size for adopting method of the present invention to several magnesium alloys such as AZ31, AZ80, GW103K.Table 1 has been listed the inventive method and has been prepared the turning amount and the turning rate of ingot blank, and prepares ingot blank with traditional DC casting method and compare, and the turning rate of visible ingot blank is significantly reduced.Table 2 is the casting speed contrast of several different size ingot blanks, and as seen, the casting speed of the inventive method is apparently higher than the casting speed of traditional DC casting method.
The turning amount of table 1 the inventive method and traditional DC casting method and the contrast of turning rate
The casting speed contrast of table 2 the inventive method and traditional DC casting method
Claims (5)
1, the crystallizer used of a kind of cunning electromagnetic vertical type semi-continuous casting of magnesium alloy ingot blank, it is characterized in that this crystallizer comprises inner metal sleeve, cooling system, magnet exciting coil, splash ring and protection compression ring, inner metal sleeve is in the center of crystallizer, it outside inner metal sleeve the cavity cooling system that cooling water tank and baffle plate constitute, the bottom is provided with magnet exciting coil in cooling water cavity, upper edge at inner metal sleeve is provided with oil ring, is equipped with the protection compression ring above oil ring; Described oil ring is made of cavity of resorption and loam cake, the oil ring cavity of resorption is provided with 3 grooves and constitutes 3 accumulators with loam cake, be communicated with by some breach between the accumulator, one tip degree is arranged in the upper edge of oil ring cavity of resorption, leave the oil seam between oil ring cavity of resorption and the loam cake, the oil ring oil supply system outer with being located at crystallizer communicates, and used lubricant is industrial castor oil or industrial coconut oil; Described protection compression ring is provided with the outlet of protection gas.
2, the crystallizer used of the cunning electromagnetic vertical type semi-continuous casting of magnesium alloy ingot blank as claimed in claim 1 is characterized in that described inner metal sleeve is that vertical cylinder type or its latter half has 3～10 ° opening degree.
3, the crystallizer used of the cunning electromagnetic vertical type semi-continuous casting of magnesium alloy ingot blank as claimed in claim 1, it is characterized in that described cooling system is provided with water inlet, the magnet exciting coil that is located in the cooling water cavity soaks the end in cooling water, magnet exciting coil joins with the low-frequency power that is located at the crystallizer outside, and magnet exciting coil is near the crystallizer bottom.
4, a kind of cunning electromagnetic vertical type semi-continuous casting method of magnesium alloy ingot blank, the crystallizer that it is characterized in that adopting the cunning electromagnetic vertical type semi-continuous casting of the described magnesium alloy ingot blank of claim 1 to use, carry out according to the following steps:
(1) at first coat thin layer lubricating oil at the inner metal sleeve inwall, the centering dummy bar head is opened the crystallizer cooling system, and the control cooling water flow is the cooling magnet exciting coil earlier;
(2) open low frequency generation power supply, to the logical low frequency ac of magnet exciting coil, for crystallizer provides low frequency electromagnetic field, or one group of logical low frequency ac during two groups of magnet exciting coils, the logical simultaneously direct current of another group is for crystallizer provides the low frequency electromagnetic oscillation field; Make electromagnetic field reach setting value 2000AT～40000AT;
(3) liquid magnesium alloy is introduced the shunting disk place inner metal sleeve heart portion, by entering after the shunting disk shunting in the inner metal sleeve of crystallizer and the space that dummy bar head is formed, unlatching simultaneously protects compression ring to provide gas shield for liquid magnesium alloy;
(4) treat that liquid magnesium alloy is full of the dummy bar head top, liquid level rises near behind the normal casting height, start casting machine and regulate and control mold liquid level by setting casting speed, set casting speed according to alloy designations and ingot blank specification and different, be generally 50～300mm/min to stable;
(5) strengthen cooling water flow, open with the by-pass valve control of regulating the control oil ring and provide continuous lubrication for the inner metal sleeve inwall.
5, the cunning electromagnetic type vertical type semi-continuous casting method of magnesium alloy ingot blank as claimed in claim 4, it is characterized in that the electromagnetic field that is applied is a low frequency electromagnetic field, frequency range is 1Hz～90Hz, the electromagnetic field intensity at crystallizer center was 10mT～200mT when crystallizer was unloaded, and the direct solenoid induction is 5～100mT.
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| CN102294445B (en) * | 2011-08-17 | 2013-06-05 | 中国科学院金属研究所 | Auxiliary semi-continuous casting crystallizer for low-frequency pulsed magnetic field of magnesium alloy and application thereof |
| CN102505088A (en) * | 2011-12-31 | 2012-06-20 | 辽宁忠旺集团有限公司 | Method for manufacturing aluminum profiles used for coal cars |
| CN104368777A (en) * | 2014-12-11 | 2015-02-25 | 西南铝业（集团）有限责任公司 | Automatic lubricating square ingot crystallizing device |
| CN104525882A (en) * | 2014-12-11 | 2015-04-22 | 西南铝业（集团）有限责任公司 | Automatic oil lubricating crystallizer |
| CN105215306B (en) * | 2015-10-28 | 2017-12-01 | 东北大学 | A kind of aluminum alloy semi-continuous casting device and method |
| CN107116190B (en) * | 2017-03-23 | 2019-04-19 | 中南大学 | The big ingot blank electromagnetism semicontinuous casting technique of AQ80M magnesium alloy |
| CN106944598B (en) * | 2017-04-01 | 2018-10-02 | 东北大学 | A kind of electromagnetism semi-continuous casting device and its casting method |
| CN108405821B (en) * | 2018-04-03 | 2019-09-03 | 东北大学 | The casting device and method of the big specification magnesium alloy slab ingot of flawless |
| CN108637200B (en) * | 2018-04-03 | 2019-12-24 | 东北大学 | Large-size magnesium alloy long slab ingot semi-continuous casting device |
| CN110193588B (en) * | 2019-07-10 | 2021-01-12 | 东北大学 | Aluminum-lithium alloy low-frequency square wave electromagnetic continuous casting device and method |
| CN110405170B (en) * | 2019-08-28 | 2021-03-16 | 东北大学 | Low-cooling electromagnetic semi-continuous casting device and method |
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