CN101332493B - Gas film quick continuous casting device and method in magnetostatic field - Google Patents
Gas film quick continuous casting device and method in magnetostatic field Download PDFInfo
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- CN101332493B CN101332493B CN2008100125745A CN200810012574A CN101332493B CN 101332493 B CN101332493 B CN 101332493B CN 2008100125745 A CN2008100125745 A CN 2008100125745A CN 200810012574 A CN200810012574 A CN 200810012574A CN 101332493 B CN101332493 B CN 101332493B
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Abstract
The invention discloses a rapid gas film continuous casting device under the action of a magnetostatic field; the device comprises a crystallizer, a hot top, an induction coil, a double-layer cooling water channel, an oil-gas ring and a graphite annulus, and is characterized in that the hot top is surrounded by the induction coil, the oil-gas ring is arranged between the outlet of the hot top and the graphite annulus, the oil-gas ring is provided with an oil inlet and a gas inlet, the oil inlet and the gas inlet can lead oil and gas outside the crystallizer to the crystallizer by an oil channel and a gas channel on the crystallizer; lubricant and gas are led to the oil-gas ring in the rapid gas film continuous casting; the magnetic field is applied by the induction coil, and an alloy is poured at the pouring temperature. The rapid gas film continuous casting device can obviously improve the surface quality and inherent metallurgical quality of ingot casting, and improve throwing speed and production efficiency.
Description
Technical field
The invention belongs to metallurgical technology field, air film quick continuous casting device and method under particularly a kind of magnetostatic field effect.
Background technology
The air film continuous casting technology is by forming one deck air film between crystallizer inwall and the strand scull, make crystallizer inwall and ingot casting be in soft contact condition, not only reduced the friction between strand and the crystallizer, having improved surface quality.In the prior art, there is dual mode between crystallizer and strand, to form air film, a kind of is the AIRSLIP continuous casting technology of the U.S., another kind is the AIRSOL VEIL continuous casting technology of Germany, the difference of two kinds of technology is that the former passes through a kind of high-quality porous graphite ring oil gas is injected the crystallizer inwall, and the latter injects oil gas by the slit between heat top and the graphite annulus.Two kinds of external technology all have been applied among the actual production, and have complete set of equipments to promote the use of in countries in the world.But the crystallizer in the continuous casting installation for casting is as nucleus equipment, its structure one is directly subordinate to confidential technique, existing document " The airslip casting mold-anestablished technology " (J.P.Faunce, Light metals 1985) and in " Improved technology of the AIRSOLVEIL billet casting system " (W.Schneider, Light Metals 1994) can only see its structure diagram.
Domestic patent CN1621179 " aluminium alloy gas film continuous casting crystallizer ", document " experimental study of soft contact air film continuous casting " (Luo Hongbo etc., Shanghai University's journal, 2002,8 the 5th phases of volume) all the air film continuous casting technology there is detailed introduction, but domestic air film foundry engieering or also in the experimental stage, adopt the porous graphite ring, the porous graphite ring costs an arm and a leg, processing difficulties, and easily in casting process because of the carbonization of lubricating oil with hole plug, influence slab quality.
Prior art is owing to be subjected to the influence of air film stability, and the casting speed of two kinds of technology is not made than the traditional hot direct casting and obviously improved, and continuous casting technology rapidly and efficiently is metallargist's pursuit always.
Summary of the invention
The objective of the invention is to overcome the deficiency on the prior art, air film quick continuous casting device and method under a kind of magnetostatic field effect are provided.
Air film quick continuous casting device of the present invention comprises crystallizer, Re Ding, induction coil, double-deck cooling-water duct, oil gas ring and graphite annulus.Wherein outside, heat top is surrounded with induction coil, the oil gas ring is set between Re Ding exit and graphite annulus, have fuel feed hole and air admission hole on the oil gas ring, fuel feed hole and air admission hole can feed oil and gas by the gentle passage of oily passage on the crystallizer in the export-oriented crystallizer of crystallizer; The outside of oil gas ring and graphite annulus is connected crystallizer, crystallizer is provided with double-deck cooling-water duct in the bottom with the graphite annulus junction, angle is 45 °～60 ° between upper strata cooling-water duct and the crystallizer wall, and the angle between lower floor's cooling-water duct and the crystallizer wall is 25 °～35 °.
Fuel feed hole on the oil gas ring of the present invention and air admission hole are two equally distributed otch of end face at the oil gas ring, and wherein Shang Fang otch is an air admission hole, and the otch of below is a fuel feed hole, between each fuel feed hole two air admission holes up.The oil gas ring material that the present invention adopts is an austenitic stainless steel.
Method of the present invention is:
The selected alloy of melting in melting furnace, temperature be than pouring temperature overheated 50 ℃～80 ℃, carry out conventional purified treatment, leave standstill insulation.When continuous casting, adopt air film quick continuous casting device of the present invention, in the oil gas ring, feed lubricating oil and gas, lubricating oil pressure is 0.5～4MPa, gas pressure is 1～9KPa; And at cooling-water duct feeding cooling water, cooling water pressure applies magnetic field by induction coil more than 0.2MPa, and magnetic induction intensity is 0.01～0.2T; Dummy bar head is risen to the graphite annulus exit, alloy is cooled to pouring temperature begins cast, strict control fluid flow and liquid level in casting process are in order to avoid influence the stability of oil gas film; In the starting stage, a little less than the cooling that melt is subjected to, scull is thinner, and for fear of the generation of bleedout accident, it is slow that casting speed is wanted, and progressively improves casting speed, regulates the oil gas flow simultaneously, until arriving desired speed, enters the stabilizing continuous casting stage.
The present invention is provided with the oil gas ring between Re Ding exit and graphite annulus, utilize line cutting technology to cut the otch of 0.1～0.2mm at oil gas ring end face, lubricating oil and gas inject crystallizer by the oil gas ring, between strand and crystallizer, form one deck air film in the casting process, air film has effect of contraction to melt, avoids contacting between strand and the crystallizer inwall.The oil gas ring is the key point that guarantees air film continuity and stability, ventilates above the oil gas ring, logical below oil, and oil, gas all have own autonomous channel, converge to form the oil gas film in crystallizer.Narrower slit has guaranteed the uniformity and the stability of oil gas film, and has characteristics such as easy to process, difficult obstruction.Graphite annulus is installed in the crystallizer, graphite annulus and crystallizer interference fit, lubricating oil and gas enter crystallizer internal cavity by the oil gas ring between graphite annulus and heat top, make in the casting process and form air film between the graphite annulus and strand, reduce the friction between strand and the crystallizer inwall, improve slab surface quality.
The present invention adopts the double fluid cooling, and the water spray angle difference of cooling water, angle is 45 °～60 ° between upper strata cooling water and the strand, angle between lower layer of water and the strand is 25 °～35 °, because the air film casting is different with conventional DC casting, melt does not contact with crystallizer wall substantially, so it is very weak to come from the cooling first time of crystallizer wall, the initial set hull shape becomes location point to reduce.For the effective cooling length (injection point is to the distance of hot top ports) that has shortened crystallizer, strengthened the angle of ground floor cooling water; Simultaneously, the secondary cooling (being water quench) of strand has been strengthened in the use of double-deck cooling water, and the initial set thickness of the shell is increased, this not only can guarantee the stable of ingot casting surface, improve ingot surface quality, also can improve the cooling velocity of ingot casting simultaneously, the liquid cave is straight, improve the ingot casting internal metallurgical quality, the more important thing is when improving slab surface quality and internal soundness, can improve casting speed, boost productivity.
Apply magnetostatic field on the crystallizer of the present invention, when liquid metal flows in crystallizer, if the metal bath that flows has cut the magnetic line of force, then in liquid metal, produce induced current, induced current produces the Lorentz force opposite with flow direction again with the reciprocation of constant magnetic field in liquid metal, thereby the mobile of liquid metal is controlled, the flowing velocity of liquid metals is high more, the component of its horizontal (perpendicular to the crystallizer center line) is big more, then Lorentz force is strong more, the resistance that flows is big more, so can suppress the liquid metal liquid towards metal that pours into and the impact on ingot casting surface significantly, guarantee pressure stability that liquid metal in the crystallizer is circumferential and first scull stable.Because a little less than cooling off for the first time during the air film casting, the initial set hull shape becomes very late, so avoid liquid metal, promptly can guarantee to obtain the ingot casting of great surface quality near the impact of the melt the crystallizer wall and the impact of scull just, can improve casting speed again.
Air film quick continuous casting device of the present invention and method can guarantee that the air film on the ingot casting circumference is even, stablize; The double fluid cooling is set, improve intensity of cooling for the second time, apply magnetostatic field simultaneously, suppress melt transversal flow, guarantee the stable of melt circumferential pressure, this technology can significantly improve the surface quality and the internal metallurgical quality of ingot casting, improve casting speed, boost productivity.
Description of drawings
Fig. 1 is that the air film quick continuous casting device under the magnetostatic field effect of the present invention is used schematic diagram.Among the figure, 1, Re Ding, 2, induction coil, 3, the gas passage, 4, oily passage, 5, double-deck cooling-water duct, 6, the oil gas ring, 7, graphite annulus, 8, crystallizer, 9, melt, 10, strand, 11, dummy bar head.
Fig. 2 is an oil gas rings cut structural representation of the present invention.
Fig. 3 makes the ingot surface quality comparison diagram for preparing with air film fast continuous casting of the present invention for the traditional hot direct casting, and wherein the ingot surface quality of preparation is made in a, traditional hot direct casting, the ingot surface quality of b, air film fast continuous casting method of the present invention preparation.
Fig. 4 makes the ingot casting surface segregation layer thickness comparison diagram for preparing with air film fast continuous casting of the present invention for the traditional hot direct casting, wherein the ingot casting surface segregation layer thickness of preparation is made in a, traditional hot direct casting, the ingot casting surface segregation layer thickness of b, air film fast continuous casting method of the present invention preparation.
The specific embodiment
The air film quick continuous casting device as shown in Figure 1, outside, heat top is surrounded with induction coil, the oil gas ring is set between Re Ding exit and graphite annulus, its material is an austenitic stainless steel, have fuel feed hole and air admission hole on the oil gas ring, fuel feed hole and air admission hole can feed oil and gas by the gentle passage of oily passage on the crystallizer in the export-oriented crystallizer of crystallizer; The outside of oil gas ring and graphite annulus is connected crystallizer, and crystallizer is provided with double-deck cooling-water duct in the bottom with the graphite annulus junction, and angle is 60 ° between upper strata cooling-water duct and the crystallizer wall, and the angle between lower floor's cooling-water duct and the crystallizer wall is 30 °.
Oil gas ring of the present invention as shown in Figure 2, fuel feed hole and air admission hole are two equally distributed otch of end face at the oil gas ring, wherein Shang Fang otch is an air admission hole, the otch of below is a fuel feed hole, between each fuel feed hole two air admission holes up; It specifically is of a size of, and the oil gas ring thickness is 4mm, and kerf width is 0.1mm, and each oil-gas hole and air admission hole spacing are 5mm, and the degree of depth of oil-gas hole and air admission hole is 2mm.
Adopt air film quick continuous casting device as shown in Figure 1, air film fast continuous casting 6063 aluminium alloy φ 174mm strands under the magnetostatic field effect.
Alloy in induction furnace melting, is changed over to tundish and carries out degasification, skims in the time of 780 ℃, leave standstill insulation.Alloy temperature is reduced to pouring temperature (720 ℃), simultaneously dummy bar head is risen to the graphite annulus place, open the valve of lubricating oil, argon gas and cooling water, feed lubricating oil and gas in the oil gas ring, lubricating oil pressure is 2MPa, and gas pressure is 4KPa; And feed cooling water at cooling-water duct, and cooling water pressure is at 0.2MPa, and applies magnetic field by induction coil, and crystallizer center induction level is 0.04T; Dummy bar head is risen to the graphite annulus exit, liquid alloy is introduced crystallizer.Begin cycling start when liquid level rises to apart from heat top upper end 40mm, playing vehicle speed is 90mm/min, progressively improves speed then, and smooth transition enters the stabilization sub stage to desired speed, and casting speed is 170mm/min.
6063 aluminium alloy cast ingot dense internal organization of the present invention's preparation, any surface finish, subcutaneous segregation layer is thinner, can reach the requirement of direct extruding, and the ingot casting contrast that its ingot surface quality and ingot casting surface segregation layer thickness and traditional hot direct casting are made as shown in Figure 3 and Figure 4.
The present invention compares with present air film continuous casting technology, and gas-oil ring can guarantee all sexual and stable of lubricating oil and gas; Apply magnetostatic field and can effectively stop high-temperature fusant to the washing away of scull, stopped the generation of segregation knurl, the casting billet surface light; The double fluid cooling has improved the effective cooling intensity of crystallizer, has reduced liquid point depth, has created condition for improving casting speed, and casting speed of the present invention improves 50～60% than the conventional film casting speed, can Effective Raise production efficiency.
Claims (8)
1. the air film quick continuous casting device under the magnetostatic field effect comprises crystallizer, Re Ding, induction coil, double-deck cooling-water duct, oil gas ring and graphite annulus; Be characterised in that: outside, heat top is surrounded with induction coil, the oil gas ring is set between Re Ding exit and graphite annulus, have fuel feed hole and air admission hole on the oil gas ring, fuel feed hole and air admission hole can feed oil and gas by the gentle passage of oily passage on the crystallizer in the export-oriented crystallizer of crystallizer; The outside of oil gas ring and graphite annulus is connected crystallizer, and crystallizer is provided with double-deck cooling-water duct in the bottom with the graphite annulus junction.
2. the air film quick continuous casting device under a kind of magnetostatic field effect according to claim 1, it is characterized in that the upper strata cooling-water duct of described double-deck cooling-water duct and the angle of crystallizer wall are 45 °～60 °, the angle between lower floor's cooling-water duct and the crystallizer wall is 25 °～35 °.
3. the air film quick continuous casting device under a kind of magnetostatic field effect according to claim 1, the material that it is characterized in that described oil gas ring is an austenitic stainless steel, its fuel feed hole and air admission hole are two equally distributed otch of end face at the oil gas ring, wherein Shang Fang otch is an air admission hole, and the otch of below is a fuel feed hole.
4. the air film quick continuous casting device under a kind of magnetostatic field effect according to claim 1, it is characterized in that by heat top outside around induction coil can in crystallizer, apply magnetostatic field, suppress melt impact to its peripheral surface and the first scull of ingot casting in crystallizer by Lorentz force, guarantee ingot surface quality.
5. the air film fast continuous casting method under the magnetostatic field effect is characterized in that: adopt the described magnetostatic field effect of claim 1 air film quick continuous casting device down, feeding lubricating oil and gas in the oil gas ring; Dummy bar head is risen to the graphite annulus exit, open cooling-water duct, apply magnetic field, alloy is begun cast in pouring temperature, after first scull is strengthened by induction coil; Progressively improve casting speed then, regulate the oil gas flow simultaneously,, enter the stabilizing continuous casting stage until arriving desired speed.
6. the air film fast continuous casting method under a kind of magnetostatic field effect according to claim 5 is characterized in that the lubricating oil pressure that feeds is 0.5～4MPa, and gas pressure is 1～9KPa.
7. the air film fast continuous casting method under a kind of magnetostatic field effect according to claim 5 is characterized in that the magnetic induction intensity that applies by induction coil is 0.01～0.2T.
8. the air film fast continuous casting method under a kind of magnetostatic field effect according to claim 5, the cooling water pressure that it is characterized in that feeding is more than 0.2MPa.
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| CN2008100125745A CN101332493B (en) | 2008-07-31 | 2008-07-31 | Gas film quick continuous casting device and method in magnetostatic field |
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