CN102310174B - Method and device for improving metal solidification defects and refining solidification textures - Google Patents
Method and device for improving metal solidification defects and refining solidification textures Download PDFInfo
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Abstract
The invention relates to a method and a device for improving metal solidification defects and refining solidification textures. The method and the device comprise an excitation power supply and a magnetic field generating device, wherein the magnetic field generating device is immersed into casting piece (casting blank) and continuous casting metal liquid, crystal nucleuses on the inner surface of the magnetic field generating device are stripped in the metal liquid through electromagnetic force and the joule heating effect, melt vibration and convection are caused by the magnetic field, a large number of crystal nucleuses are continuously dispersed into the metal liquid so as to shorten the feeding distance in a metal solidification process, restrain casting piece and casting blank (ingot) central defects, relieve A segregation and refine the solidification textures, and simultaneously the surface is prevented from being rolled inside in mingling way. The method and device disclosed by the invention are used for preparing casting pieces, continuous casting blanks, mold casting ingots, mold casting blanks and hollow blanks of black metal and non-ferrous metal under vacuum and non-vacuum conditions.
Description
Technical field
The present invention is a kind of method and apparatus that improves coagulation defect, thinning solidification structure, relate to the preparation of ferrous metal and non-ferrous metal foundry goods, continuous casting billet, ingot casting, die casting base and hollow ingot under vacuum and non-vacuum condition, can suppress the loose formation of A segregation and central pipe, simultaneously can thinning solidification structure.
Background technology
In recent years along with China's power industry, the fast development of nuclear industry and petro chemical industry, demand to heavy castings, large-scale steel ingot, large-scale blank is increasing, also the quality requirements to heavy casting and forging is more and more higher simultaneously, large-scale steel ingot, continuous casting billet are the products in advance of heavy casting and forging, and its quality is particularly important to improving the heavy casting and forging quality.But the steel ingot inside of weight more than 100 tons per almost all exists shrinkage cavity loose, and shrinkage cavity loose general and field trash symbiosis increase the difficulty of steel ingot when forging.And large-scale shrinkage cavity rarefaction defect is difficult to healing in forging process, thereby causes the forging flaw detection defective, even scraps.The process of setting of large-scale steel ingot is very very long, different according to the steel ingot tonnage, do not wait from tens hours to up to a hundred hours, solute redistribution is abundant, causes low melting point, the materials of low density such as carbon, phosphorus in the solidification front enrichment, adds other physical action, impact as thermosolutal convection etc., make steel ingot zones of different uneven chemical components, cause gross segregation, as the segregation of A type, V-type segregation.In addition, the solidified structure refinement is the target that scientific research and industry are pursued always, adds thick equiaxed grain structure but the typical organization of large steel ingot is column crystal.Therefore solve the quality problems of blank inherence, improve qualification rate extremely urgent.
The internal flaw problem of large-scale steel ingot, foundry goods, blank enjoys researcher and business circles to pay close attention to.People have developed and have strengthened rising head, adopted top insulation material even to adopt the method such as electrical heating to be prepared, and when causing material, energy consumption, but solve the problem that exists fully.Electromagnetic agitation is another technology that people develop, and namely by the magnet exciting coil in the crystallizer outside, drives convection current with molten metal by electromagnetic induction, and the dendrite that the convection current melt washes away solidification front produces the dendrite fragment that fractures, thereby improves solidified structure.Although electromagnetic agitation is effectively, due to the restriction of large-scale steel ingot size, and the ingot solidification shell is to the shielding action of the electromagnetism depth of penetration, and this technology can't be applied to large-scale steel ingot and the preparation of large scale continuous casting billet.Ultrasonic vibration is another technology that people develop, namely ultrasonic wave is imposed on molten metal, make ultrasonic disruption dendrite or producing the Cavitation effect Stimulated Nucleation in melt on a large scale, this technology also obtains certain progress, but the restriction of ultrasonic operating distance also is not suitable for the application in large-scale steel ingot.
In recent years, the researcher has also developed the technology that adopts the mechanical oscillation exciting metal liquid nucleus, by controlling the mechanical oscillation of fire proofed wood charge bar in molten metal, inspires fire proofed wood charge bar surface crystal forming core, comes off under the effect of mechanical force, improve solidified structure, improve equiaxial crystal ratio.The breakage of this technology refractory material that the mechanical oscillation in molten metal occur due to refractory material, erosion and refractory surface metal freezing crust are still needed perfect.Surface vibration simultaneously easily causes blemish and enters in part, brings the new defect problem that is involved in, and has affected its application.
Summary of the invention
The present invention is directed to the problems referred to above of the prior art, the technical problem that solves is to solve present steel ingot, foundry goods, the inner A segregation of strand, shrinkage cavity rarefaction defect, improve the problems such as solidified structure, a kind of method and apparatus that improves metal freezing defective, thinning solidification structure is provided.
Technical scheme of the present invention is:
A kind of method of improving metal freezing defective, thinning solidification structure is characterized in that, comprises the steps:
1) for cast and the process of setting of steel ingot or foundry goods, in its rising head, in tundish or add one or more field generator for magnetic in rising head, tundish in molten metal simultaneously; For the continuous casting billet casting process, in crystallizer, tundish is interior or add one or more field generator for magnetic in crystallizer, tundish in molten metal simultaneously;
2) field power supply is field generator for magnetic conduction exciting current by cable, the exciting current that field power supply provides is pulse current, pulse frequency is 1-1000Hz, pulse voltage is 1-5000V, make magnetic fields in the molten metal of field generator for magnetic inside, make the nucleus that forms on the field generator for magnetic inwall come off under the effect of electromagnetic force and Joule heat;
3) melt vibration and convection current are caused in magnetic field, a large amount of nucleus in the molten metal of field generator for magnetic inside are distributed in molten metal constantly, shorten the feeding distance in metal solidification process, improve foundry goods, ingot casting central defect, thinning solidification structure alleviates segregation.
Field generator for magnetic is the open circles barrel shaped structure, built-in magnet exciting coil in drum bucket wall, and the magnet exciting coil arranged outside has the annular magnetic screen layer to carry out magnetic screen, prevents the liquid surface fluctuation of field generator for magnetic outside; The field generator for magnetic inwall is provided with the composite of metal and corundum as inner surface, is used to form nucleus.
The degree of depth of field generator for magnetic in molten metal makes the following 10-100mm of the complete immersed in liquid level in magnet exciting coil position according to the size of magnet exciting coil.
The magnet exciting coil outside has coolant jacket to surround, interior logical cooling medium protection magnet exciting coil, and the surface temperature of maintenance field generator for magnetic is the following 50-700 of molten metal liquidus temperature ℃.
In crystallization control device or tundish, the degree of superheat of molten metal is 20-90 ℃.
Under non-vacuum condition, the metal bath surface in field generator for magnetic is carried out argon shield, prevent the molten metal oxidation.
A kind of device that improves metal freezing defective, thinning solidification structure comprises:
1) field generator for magnetic immerses the molten metal in steel ingot, foundry goods and continuous casting mold) in;
2) field power supply is field generator for magnetic conduction exciting current by cable, and the exciting current that field power supply provides is pulse current, makes magnetic fields in the molten metal of field generator for magnetic inside.
Field generator for magnetic is the open circles barrel shaped structure, the bottom is permeable structures, being used for molten metal enters in field generator for magnetic, comprise excitation wire, coolant jacket, separation layer, magnetic masking layer and clad and the inner surface that is used to form nucleus, wherein the drum maximum gauge is the 1/10-1/2 of casting pressing port, steel ingot rising head or crystallizer corresponding size; Built-in magnet exciting coil in drum bucket wall, magnet exciting coil arranged outside have the annular magnetic screen layer to carry out magnetic screen, prevent the metal bath surface disturbance of field generator for magnetic outside; The field generator for magnetic inwall is provided with the composite of metal and corundum as inner surface, is used to form nucleus.
The outermost layer of field generator for magnetic open circles barrel shaped structure is clad, and magnet exciting coil is built in clad inside, and clad is the compound of refractory material, graphite, metal, pottery, cermet or above-mentioned material.
The magnet exciting coil outside has coolant jacket to surround for cooling magnet exciting coil, and the coolant jacket material is that austenitic stainless steel, copper, pottery and other magnetic conductivities are the material of 0.99-1.1, and in coolant jacket, cooling medium is water, oil or gas.
Be provided with separation layer between coolant jacket and clad, to guarantee the temperature difference of clad and coolant jacket, insolated layer materials is selected from the insulation materials such as asbestos or mineral wool.
The annular magnetic screen layer is arranged on that between the outside of coolant jacket and separation layer, the molten metal to the outside carries out magnetic screen, prevent outside liquid surface fluctuation, the material of magnetic masking layer is that silicon steel, nickel-base alloy, cobalt-base alloys, cast iron, permalloy, pure iron and other magnetic conductivities are the material of 50-100000.
The exciting current that field power supply provides is pulse current, and waveform comprises that sharp wave, square wave, sine involve amplitude-modulated wave shape.
Built-in temperature thermocouple in the separation layer of field generator for magnetic.
The inside of field generator for magnetic is provided with the metal bath surface argon protective device, and argon pressure is at 0.2-5MPa, and flow is at 0.2-5 liter/min of clock.Argon protective device can adopt thermocouple.
The principle of method of the present invention and device is: as shown in Figure 3, field generator for magnetic inspires the process status schematic diagram of metal liquid nucleus; Field generator for magnetic applies pulsed magnetic field to inner molten metal, under the effect of electromagnetic force and Joule heat, a large amount of nucleus of field generator for magnetic inner surface come off, and be distributed in molten metal by melt vibration and the convection current that cause in magnetic field, increase the forming core particle of molten metal inside, improved grain density, changed the solidification mode of molten metal, thereby the shrinkage cavity of eliminating steel ingot, foundry goods, strand inside is loose and the A segregation, improve utilization rate, the qualification rate of material, reduce energy consumption, while thinning solidification structure, the performance of raising solidification blank.Utilize production solidification blank of the present invention to have dense structure, homogeneous chemical composition, low cost, high performance characteristics.
The present invention has following beneficial effect:
1. adopt the inventive method to be used for improving metal freezing defective, thinning solidification structure, because the exciting current that has utilized field power supply to provide is pulse current, pulse frequency is 1-1000Hz, pulse voltage is 1-5000V, make the magnetic fields of field generator for magnetic generation in molten metal, cause melt vibration and convection current, can to bulk metal liquid generation effect, be suitable for the preparation of large-scale steel ingot and large scale continuous casting billet;
2. field generator for magnetic of the present invention makes the nucleus that forms on the field generator for magnetic inwall come off under the effect of electromagnetic force and Joule heat, is a kind of high-efficiency continuous nucleation process; Melt vibration and convection current that field generator for magnetic causes can promote nucleus to be distributed in large-scale melt, the uniformity that is distributed with of nucleus;
3. the inner surface of field generator for magnetic of the present invention both had been beneficial to nucleation, and good heat resistanceheat resistant shake performance and corrosion-resistant property are arranged again, can increase the service life of device.
4. melt vibration and convection current are caused in the inventive method magnetic field, be distributed to constantly a large amount of nucleus in molten metal, shorten the feeding distance in metal solidification process, improve foundry goods, the ingot casting central defect, thinning solidification structure, alleviate segregation, and in vibration processes, the measures such as magnetic screen to outside molten metal of the gas shield of metal bath surface and field generator for magnetic, and the field generator for magnetic that adopts does not vibrate, but the effect by electromagnetic force, make the molten metal in field generator for magnetic produce vibration, prevent that liquid level impurity is because vibration enters in part, reduce the generation of other impurity defects,
5. technological design of the present invention is reasonable, by the effect of field generator for magnetic to molten metal, roll up the forming core particle of molten metal inside, improve the nucleus forming core, changed the solidification mode of molten metal, thereby the shrinkage cavity that suppresses steel ingot, foundry goods, strand inside is loose and the A segregation, and thinning solidification structure improves inherent quality and the product percent of pass of product;
6. apparatus of the present invention possess cooling, insulation, thermometric, external magnetic shielding, inside and apply magnetic field and internal gas protection function, make a large amount of nucleus of the formation of molten metal on the field generator for magnetic inner surface, peel off under the effect of the electromagnetic force in magnetic field and Joule heat, and cause melt vibration and convection current by magnetic field and be distributed to molten metal with what a large amount of nucleus continued;
7. apparatus of the present invention adopt magnetic field to cause melt vibration and convection current, and itself does not vibrate device, effectively prevents liquid level impurity because vibration enters in part, reduces the generation of other defect;
8. apparatus of the present invention systems is simple, safe, workable, and enterprise easily realizes, can be applicable to the preparation of large-scale steel ingot and large scale continuous casting billet;
9. the inventive method is applicable to steel ingot, the foundry goods of various materials, the manufacturing of blank.Utilize the present invention to produce steel ingot, foundry goods, strand and have dense structure, homogeneous chemical composition, fine grain, characteristics cheaply, be easy to obtain vast research institution and works approval, in case be widely adopted, can greatly improve the quality of products, the economic benefit of several hundred million to tens hundred million will be arranged;
10. the inventive method is applicable to apply in ferrous metal and the non-ferrous metal molten metal under vacuum and non-vacuum condition in foundry goods, ingot casting, die casting base, hollow ingot and continuous casting billet preparation process in the rising head of mold and ingot mould, in crystallizer, tundish.
Description of drawings
Fig. 1 is the structural representation that the embodiment of the present invention is improved the device of coagulation defect, thinning solidification structure;
Fig. 2 is the cross-sectional view of field generator for magnetic;
Fig. 3 is the process status schematic diagram that field generator for magnetic inspires metal liquid nucleus;
Fig. 4 is the schematic diagram that field generator for magnetic is used for inspiring in the tundish of continuous casting or large steel ingot casting metal liquid nucleus technique;
Fig. 5 is the schematic diagram that field generator for magnetic is used for inspiring in continuous cast mold metal liquid nucleus technique;
Fig. 6 is the schematic diagram that field generator for magnetic is used for inspiring in ingot mould, mold rising head metal liquid nucleus technique;
Fig. 7 is the ingot solidification organization chart of embodiment 1;
Fig. 8 (a) is conventional 20 tons of ingot solidification organization charts, and Fig. 8 (b) is 20 tons of ingot solidification organization charts of embodiment 2 preparations;
Fig. 9 is the ingot solidification organization chart of embodiment 3.
Be labeled as in figure:
1 is field power supply; 2 is field generator for magnetic; 3 is molten metal; 4 is cable; 5 is clad; 6 is separation layer; 7 is magnetic masking layer; 8 is coolant jacket; 9 is magnet exciting coil; 10 is thermocouple; 11 is the argon gas conduit; 12 is inner surface; 13 is nucleus; 14 is long nozzle; 15 is tundish; 16 is sprue gate; 17 is crystallizer; 18 is the continuous casting billet shell; 19 is rising head; 20 is cooling medium inlet; 21 are the cooling medium outlet.
The specific embodiment
Below in conjunction with drawings and Examples in detail the present invention is described in detail.
The present invention is a kind of, and to improve the method for coagulation defect, thinning solidification structure as follows:
The present invention adopts Electromagnetic Treatment molten metal technique, utilize the forming core particle in electromagnetic generator increase molten metal, improve the Enhancing Nucleation Density of molten metal, make the inner large tracts of land crystallization of molten metal, thereby the shrinkage cavity that suppresses steel ingot, foundry goods, strand inside is loose and the A segregation, improve utilization rate, the qualification rate of material, reduce energy consumption, thereby improve inherent quality and the product percent of pass of product.
As depicted in figs. 1 and 2, the present invention's device of improving coagulation defect, thinning solidification structure mainly comprises: field power supply 1; Field generator for magnetic 2; Cable 4; Clad 5; Separation layer 6; Magnetic masking layer 7; Coolant jacket 8; Magnet exciting coil 9; Thermocouple 10; Argon gas conduit 11; Inner surface 12, concrete structure is as follows:
Built-in temperature thermocouple 10 in the separation layer 6 of field generator for magnetic 2, the variation of Real-Time Monitoring temperature;
The frequency of the excitation pulse current of field generator for magnetic 2 is 1-1000Hz, and excitation voltage is 1-5000V;
Going to the bottom of whole field generator for magnetic 2 is hatch frame, and the molten metal that enters is wherein produced vibration and convection current, and the molten metal of field generator for magnetic 2 outsides is vibration-generating not owing to there being magnetic masking layer.In order to prevent the oxidation of top layer molten metal; the upper top of field generator for magnetic 2 is connected with argon gas conduit 11, applies in process in magnetic field, passes into argon gas the molten metal in field generator for magnetic 2 is carried out argon shield; argon pressure is at 0.2-5MPa, and flow is at 0.2-5 liter/min of clock.
For steel ingot, cast casting process, in rising head, in tundish or add field generator for magnetic 2 simultaneously in rising head, tundish, be illustrated in figure 4 as the schematic diagram that inspires metal liquid nucleus technique in the tundish of field generator for magnetic for continuous casting or large steel ingot casting, wherein field generator for magnetic 2 is placed in tundish 15, the degree of depth in field generator for magnetic 2 immersion molten metals makes the following 10-100mm of the complete immersed in liquid level of coil position according to the size of magnet exciting coil 9.
For the continuous casting billet casting process in crystallizer, in tundish or add field generator for magnetic 2 simultaneously in crystallizer, tundish, as shown in Figure 5, the schematic diagram that is used for inspiring in continuous cast mold metal liquid nucleus technique for field generator for magnetic 2, the degree of depth in field generator for magnetic 2 immersion molten metals makes the following 10-100mm of the complete immersed in liquid level of coil position according to the size of magnet exciting coil 9;
As shown in Figure 6, be used for inspiring in ingot mould, mold rising head the schematic diagram of metal liquid nucleus technique for field generator for magnetic, the degree of depth in field generator for magnetic 2 immersion molten metals makes the following 10-100mm of the complete immersed in liquid level of coil position according to the size of magnet exciting coil 9.
Answering preheating, preheat temperature before field generator for magnetic 2 immersion molten metals is the following 50-700 of molten metal liquidus temperature ℃.When adopting method and apparatus of the present invention to be used for crystallizer or tundish, needing the degree of superheat of control molten metal is 20-90 ℃.
Pour into a mould 29 tons of static ingots, the steel ingot material is 40Cr, after the die assembly frock is complete, at the upper ends field generator for magnetic of rising head.The frequency of exciting current is 2.5Hz, and excitation voltage is 200V.Field generator for magnetic with clad and inner surface Baking out to 850 ℃, after ingot steel casting is complete, added field generator for magnetic in the steel ingot rising head before immersing molten metal.Apply in process in magnetic field; carry out argon shield in field generator for magnetic inside; argon pressure is at 0.5MPa; flow is at 0.2 liter/min of clock; the magnetic field application time is 10h, and the ingot solidification of preparing is organized as shown in Figure 7, and as can be seen from Figure 7 ingot structure is fine and close; loose and the significantly A segregation without central pipe, and steel ingot is the vast scale equiaxed grain structure.
Pour into a mould 1 ton of sand mold steel ingot, the steel ingot material is the 45# steel, after the die assembly frock is complete, at the upper ends field generator for magnetic of rising head.The frequency of exciting current is 2.5Hz, and excitation voltage is 100V.Field generator for magnetic with clad and inner surface Baking out to 900 ℃, after ingot steel casting is complete, added field generator for magnetic in the steel ingot rising head before immersing molten metal.Apply in process in magnetic field, carry out argon shield in field generator for magnetic inside, argon pressure is at 1MPa, and flow is at 0.4 liter/min of clock, and the magnetic field application time is 1h.Fig. 8 (a) is the solidified structure of conventional 1 ton of sand caststeel ingot, and Fig. 8 (b) is the solidified structure that adopts 1 ton of sand caststeel ingot of the present embodiment preparation, can find out from the steel ingot analysis result, and the present invention can eliminate the A segregation, thinning solidification structure.
Pour into a mould 24 tons of continuous casting square billets and be of a size of 600mm * 1000mm * 3400mm, material is ZG15Cr2Mo1, after the die assembly frock is complete, at the upper ends field generator for magnetic of rising head.The frequency of exciting current is 5Hz, and excitation voltage is 200V.Field generator for magnetic with clad and inner surface Baking out to 960 ℃, in the casting process of molten metal, added field generator for magnetic in crystallizer before immersing molten metal.Apply in process in magnetic field; carry out argon shield in field generator for magnetic inside; argon pressure is at 1.3MPa; flow is at 0.5 liter/min of clock; the magnetic field application time is 8h, its steel ingot analysis result as shown in Figure 9, as seen from the figure; steel ingot is inner without obviously central pipe, loose and A segregation, only A segregation and center porosity occur at ingot head.
The result of embodiment shows:
The present invention utilizes field generator for magnetic to inspire the technology of metal liquid nucleus, by increasing the forming core particle of molten metal inside, improve the forming core particle density of molten metal, at the large-area while crystal region of the inner formation of molten metal, shrinkage cavity central defect such as loose grade and the A segregation of solidification blank inside have been eliminated, be conducive to improve simultaneously the initial solidification intensity of solidification blank by increasing forming core particle large tracts of land forming core, the solidified structure of refinement solidification blank improves performance.
Claims (13)
1. a method of improving metal freezing defective, thinning solidification structure, is characterized in that, comprises the steps:
1) for cast and the process of setting of steel ingot or foundry goods, in its rising head, in tundish or add one or more field generator for magnetic in rising head, tundish in molten metal simultaneously; For the continuous casting billet casting process, in crystallizer, tundish is interior or add one or more field generator for magnetic in crystallizer, tundish in molten metal simultaneously;
2) field power supply is field generator for magnetic conduction exciting current by cable, the exciting current that field power supply provides is pulse current, pulse frequency is 1-1000Hz, pulse voltage is 1-5000V, make magnetic fields in the molten metal of field generator for magnetic inside, make the nucleus that forms on the field generator for magnetic inwall come off under the effect of electromagnetic force and Joule heat;
3) melt vibration and convection current are caused in magnetic field, a large amount of nucleus in the molten metal of field generator for magnetic inside are distributed in molten metal constantly, shorten the feeding distance in metal solidification process, improve foundry goods, ingot casting central defect, thinning solidification structure alleviates segregation;
Field generator for magnetic is the open circles barrel shaped structure, built-in magnet exciting coil in drum bucket wall, and the magnet exciting coil arranged outside has the annular magnetic screen layer to carry out magnetic screen, prevents the liquid surface fluctuation of field generator for magnetic outside; The field generator for magnetic inwall is provided with the composite of metal and corundum as inner surface, is used to form nucleus.
2. according to a kind of method of improving metal freezing defective, thinning solidification structure claimed in claim 1, it is characterized in that: the degree of depth of field generator for magnetic in molten metal makes the following 10-100mm of the complete immersed in liquid level in magnet exciting coil position according to the size of magnet exciting coil.
3. according to the method for improving metal freezing defective, thinning solidification structure claimed in claim 1; it is characterized in that: the magnet exciting coil outside has coolant jacket to surround; interior logical cooling medium protection magnet exciting coil, and the surface temperature of maintenance field generator for magnetic is the following 50-700 of molten metal liquidus temperature ℃.
4. according to the method for improving metal freezing defective, thinning solidification structure claimed in claim 1, it is characterized in that: in crystallization control device or tundish, the degree of superheat of molten metal is 20-90 ℃.
5. according to the method for improving metal freezing defective, thinning solidification structure claimed in claim 1, it is characterized in that: under non-vacuum condition, the metal bath surface in field generator for magnetic is carried out argon shield, prevent the molten metal oxidation.
6. a device that improves metal freezing defective, thinning solidification structure, is characterized in that, comprising:
1) field generator for magnetic (2) immerses in the molten metal (3) in steel ingot, foundry goods and continuous casting mold;
2) field power supply (1) is field generator for magnetic (2) conduction exciting current by cable (4), and the exciting current that field power supply (1) provides is pulse current, makes magnetic fields in the inner molten metal of field generator for magnetic (2);
Field generator for magnetic (2) is the open circles barrel shaped structure, built-in magnet exciting coil (9) in drum bucket wall, and magnet exciting coil (9) arranged outside has annular magnetic screen layer (7) to carry out magnetic screen, prevents the metal bath surface disturbance that field generator for magnetic (2) is outside; Field generator for magnetic (2) inwall is provided with the composite of metal and corundum as inner surface (12), is used to form nucleus.
7. according to the device that improves metal freezing defective, thinning solidification structure claimed in claim 6, it is characterized in that, the outermost layer of field generator for magnetic (2) open circles barrel shaped structure is clad (5), magnet exciting coil (9) is built in clad (5) inside, and clad (5) is the compound of refractory material, graphite, metal or above-mentioned material.
8. according to the device that improves metal freezing defective, thinning solidification structure claimed in claim 7, it is characterized in that, magnet exciting coil (9) outside has coolant jacket (8) to surround for cooling magnet exciting coil (9), coolant jacket (8) material is that austenitic stainless steel, copper, pottery and other magnetic conductivities are the material of 0.99-1.1, and in coolant jacket, cooling medium is water, oil or gas.
9. according to the device that improves metal freezing defective, thinning solidification structure claimed in claim 8, it is characterized in that, be provided with separation layer (6) between coolant jacket (8) and clad (5), to guarantee the temperature difference of clad (5) and coolant jacket (8), separation layer (6) material is selected from asbestos or mineral wool.
10. according to the device that improves metal freezing defective, thinning solidification structure claimed in claim 9, it is characterized in that, annular magnetic screen layer (7) is arranged on that between the outside of coolant jacket (8) and separation layer (6), the molten metal to the outside carries out magnetic screen, prevent outside liquid surface fluctuation, the material of magnetic masking layer (7) is that silicon steel, nickel-base alloy, cobalt-base alloys, cast iron, permalloy, pure iron and other magnetic conductivities are the material of 50-100000.
11. according to the device that improves metal freezing defective, thinning solidification structure claimed in claim 6, the exciting current that field power supply (1) provides is pulse current, waveform comprises that sharp wave, square wave, sine involve amplitude-modulated wave shape.
12. according to the device that improves metal freezing defective, thinning solidification structure claimed in claim 9, it is characterized in that built-in temperature thermocouple (10) in the separation layer (6) of field generator for magnetic (2).
13. according to the device that improves metal freezing defective, thinning solidification structure claimed in claim 6, it is characterized in that, the inside of field generator for magnetic (2) is provided with the metal bath surface argon protective device, argon pressure is at 0.2-5MPa, and flow is at 0.2-5 liter/min of clock.
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| CN202517033U (en) * | 2011-09-07 | 2012-11-07 | 中国科学院金属研究所 | Device for overcoming metal solidification defect and refining solidification structure |
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| CN1555299A (en) * | 2001-09-18 | 2004-12-15 | SMS�����ɷݹ�˾ | Method and device for producing a metal strip in a strip casting machine with rolls |
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