CN201291295Y - Magnetic pulse semi-continuous casting device - Google Patents
Magnetic pulse semi-continuous casting device Download PDFInfo
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- CN201291295Y CN201291295Y CNU2008202195803U CN200820219580U CN201291295Y CN 201291295 Y CN201291295 Y CN 201291295Y CN U2008202195803 U CNU2008202195803 U CN U2008202195803U CN 200820219580 U CN200820219580 U CN 200820219580U CN 201291295 Y CN201291295 Y CN 201291295Y
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Abstract
The utility model belongs to the technical field of metal solidification, in particular to a magnetic pulse semi-continuous casting device. The casting device comprises a semi-continuous casting machine, a pulsed magnet field generating device and a magnetic pulse action system; wherein the semi-continuous casting machine consists of an alloy smelting furnance, a crystallizer, a casting blank, a dummy ingot device and an alloy melt; the magnetic pulse action system is arranged at the outer part of the crystallizer and is tightly attached on the outer surface of the crystallizer; the pulsed magnet field generating device is connected with the magnetic pulse action system; the alloy melt flown out of the alloy smelting furnance flows through the crystallizer and solidified into the casting blank under the pulsed magnet field; and the dummy ingot device is arranged at the bottom of the casting blank. The magnetic pulse action is led to semi-continuous casting; when the alloy melt to be cast is cast into the crystallizer, the dummy ingot device and the pulsed magnet field generating device are started at the same time; and the alloy melt in the crystallizer is processed by magnetic pulse, while a solidified blank shell is formed near the wall of the crystallizer, so that a uniform fine-crystal alloy cast ingot is formed in the downward pulling of the dummy ingot device.
Description
Affiliated technical field
The utility model belongs to metallurgy and technical field of metal material preparation, is specially a kind of magnetic pulse semi-continuous casting device.
Background technology
Direct water-cooling continuous casting technology (Direct chill casting) also claims DC casting or semi-continuous casting method, succeed in developing in 1933 by German Junghaus, its basic principle is that metal bath is poured into by in the water-cooled crystallizer, after melt begins to be frozen into the base shell, by draw-gear it is pulled out crystallizer and continues the water spray cooling, thereby obtain ingot casting.According to ingot blank lead difference, can be divided into vertical continuous casting and horizontal continuous-casting again.Nineteen thirty-five, ALCOA company and VLW company are applied to aluminium alloy casting with the vertical continuous casting method, become the beginning that modern aluminum alloy continuous casting is produced.DC continuous casing production efficiency height, the casting cost is low, simple to operate, through development and improvement for many years, to the seventies in last century, has become the non-ferrous metal ingot blank production method of industrial extensive employing.
The ingot casting microscopic structure densification that the DC semi-continuous casting method is produced, but crystallite dimension is thicker, and tissue odds is even, has a strong impact on the mechanical property and the deformation performance of semicontinuous ingot casting.When the distortion billet is used for further deformation processing, because the crystal grain of semicontinuous ingot casting is tiny inadequately and have the chemical composition segregation, the deformation processing drag is increased, the distortion product defect increases, and deformation processing is brought adverse effect.In addition, strong cooling is in the very big internal stress of the inner generation of ingot casting during owing to the production ingot casting, and ingot casting easily produces hot tearing.Because refinement ingot casting crystal grain can effectively improve the mechanical property and the deformation performance of ingot casting, therefore, for how the crystal grain and the solidified structure of the semicontinuous ingot casting of refinement have been carried out many research, but only by improving cooling and the casting speed in the semi-continuous casting process, it is limited to produce effects.
In recent years, in process of setting, use electromagnetic field technology and obtained fast development, become a kind of effective method of improving solidified structure and performance, in metal static freezing process, apply alternating magnetic field, combined electric magnetic field and pulse electromagnetic field etc., all obtained positive effect, and attempted in semi-continuous casting, using electromagnetic field control and improving semicontinuous ingot solidification tissue.
Abroad, the aluminium alloy expert Getselev of the former Soviet Union casts the DC of the continuous magnetic field application of alternation in aluminium alloy, developed EMC electromagnetic casting (Electromagnetic casting) technology, by retraining metal bath in alternating electromagnetic field generated electromagnetic force, play constraint and the supporting role of crystallizer to melt, cancel crystallizer, realized the containerless casting of aluminium alloy, can obtain the ingot casting of any surface finish.This technology is successively adopted by Europe, Japan, the U.S. and China.This electromagnetic casting process is a target to improve the ingot casting surface mainly, adopts middle and high frequency alternating electromagnetic field to realize containerless casting, but limited to the improvement of ingot solidification tissue.
The eighties in last century, French scientist Vives casts 50 hertz industrial frequency AC magnetic field application in DC, proposed the thin brilliant casting of electromagnetism CREM technology (Casting, Refining, Electromagnetic).Casting result for aluminum alloy round ingot shows that CREM technology produces electromagnetic agitation and concussion in melt, cause melt flows, plays crystal grain thinning and improves the surface quality effect.In addition, Vives adopts steady magnetic field and power frequency electromagnetic field complex method when semi-continuous casting 1085 and 2214 aluminium alloys, has obtained the effect of thinning microstructure.Domestic Cui of Northeastern University builds loyalty etc. at DC Application in Foundry low frequency (＜50Hz) alternating electromagnetic field more, researched and developed low frequency electromagnetic semi-continuous casting (LFEC) technology, solved the surface quality problems of semicontinuous ingot casting well, and successfully be applied in the industrial production.Because the penetrating power of the infiltration melt of low frequency electromagnetic field energy force rate medium-high frequency electromagnetic field is strong, can realize the thin brilliant casting of large-size ingot casting, improves the intracrystalline solutes content simultaneously, reduces gross segregation.But the application although succeed in semi-continuous casting in alternation continuous electric magnetic field is because the kelvin effect of alternating electromagnetic field is still unsatisfactory for the thinning effect of large scale ingot casting core structure.
In recent years, pulsed magnetic field has caused people's attention to the effect of metal solidification process and solidified structure.To studies show that of materials such as iron and steel, aluminium alloy, adopt pulsed magnetic field action in static freezing process thinning solidification structure effectively.Cui of Northeastern University builds loyalty etc. the strong pulsed magnetic field technology is applied to the process of setting of LY12 aluminium alloy, significantly refinement the solidified structure of alloy, dendrite is fractureed, even tissue.Grey big strong grade of University of Science ﹠ Technology, Beijing is applied to the KS282 solidification of Al with strong pulsed magnetic field, refinement the crystallite dimension of primary silicon.The Zhai Qi outstanding person of Shanghai University etc. has studied solidifying of fine aluminium and cast iron under the strong pulsed magnetic field effect, has obtained significant thinning microstructure effect.The Liu Lin of Northwestern Polytechnical University etc. has studied the unidirectional solidification of Al-Cu eutectic alloy under the pulsed magnetic field of high-energy-density.The Tani of Japan and the Kolesnichenko of the U.S. etc. are applied to the casting process of steel with pulsed magnetic field, can change the shape of meniscus, improve the center segregation and the surface quality of strand.
The applicant is for pulsed magnetic field action studies show that in the static state casting, pulsed magnetic field action produces strong electromagnetic viscosimeter effect in melt, increase substantially nucleation rate on the one hand, make crystal growth change the equiax crystal growth pattern in addition by column crystal, crystal grain can obtain refinement significantly, and even grain size distributes in ingot casting.In addition, because pulse electromagnetic field is stronger to the penetration capacity of melt, can realize the refinement of larger cross-section ingot casting.
The utility model content
The purpose of this utility model is to provide a kind of all magnetic pulse semi-continuous casting devices of even and fine brilliant ingot casting for preparing, and realizes the refinement of semicontinuous ingot solidification even tissue.
The technical solution of the utility model is:
The utility model is applied to the semi-continuous casting process with the magnetic field impulse effect, and refinement and improve the ingot solidification tissue is specific as follows:
1, magnetic field impulse is handled the melt semi-continuous casting device and is comprised semicontinuous casting machine, the pulsed magnetic field generating means, magnetic field impulse action system three parts, semicontinuous casting machine is the alloy melting stove, crystallizer, strand, the dummy ingot device, alloy melt constitutes, the magnetic field impulse action system places the crystallizer outside, be close to the crystallizer outer surface, the magnetic field impulse action system can be solenoid, the pulsed magnetic field generating means links to each other with the magnetic field impulse action system, the alloy melt that flows out from the alloy melting stove is through crystallizer, be frozen into strand under pulsed magnetic field action, the strand bottom is provided with the dummy ingot device.
2, the magnetic field impulse effect is introduced in the semi-continuous casting process, when alloy melt to be poured pours into crystallizer, open dummy ingot device and pulsed magnetic field generating means simultaneously, produce current impulse by the pulsed magnetic field generating means, produce pulsed magnetic field through being positioned at the outer field magnetic field impulse action system of crystallizer, act on the alloy melt in the crystallizer.When the alloy melt in the crystallizer stands the magnetic field impulse processing, near crystallizer wall, form solidified shell, and then in the process of dummy ingot device traction downwards, continue to be frozen into strand, realize the alloy melt semi-continuous casting under the magnetic field impulse effect.Alloy melt pours into the moment of semi-continuous casting device crystallizer, on the type wall, produce a large amount of Quench nucleus, put on the magnetic field impulse of alloy melt, alloy melt is produced constriction and concussion effect, cause bath movement, a large amount of nucleus on the semi-continuous casting crystallization type wall are washed away, and bring in the melt, the nucleation rate of alloy melt is increased greatly; On the other hand, because magnetic field impulse makes melt produce motion, the alloy melt inside and outside temperature difference is reduced fast, homogenising alloy melt temperature, add the Joule heat effect that produces in the forward position, freezing interface, make the growth of nucleus be suppressed, growth pattern also becomes the equiax crystal growth by the post dendritic growth, thereby make solidified structure refinement, the isometry of semicontinuous ingot casting, obtain thin brilliant ingot casting uniformly.
The utility model performing step and technological parameter:
1, the casting speed of semicontinuous casting machine can be regulated arbitrarily between 30～170mm/min.According to the kind of alloy, pouring temperature, magnetic field impulse parameter etc., (optimum speed as for aluminium alloy the time is 50～70mm/min) to select suitable semi-continuous casting speed, and by regulating the rotating speed of the buncher on the semicontinuous casting machine dummy ingot device, the drop-down speed of dummy ingot device is adjusted into this casting speed.
2, the magnetic field impulse parameter of pulsed magnetic field generating means can be regulated arbitrarily in following scope: pulsed magnetic field generation voltage is that (preferable range is 100～000V) to 50～1500V, pulse frequency is that (preferable range is 5～30Hz) to 1～100Hz, and pulse operating time is that (preferable range is 5～20min) to 0～30min.According to alloy species, composition difference, and cooperate with the semicontinuous casting technique Rational Parameters, determine magnetic field impulse parameter (thinning effect according to alloy cast ingot is determined by experiment), and carry out the adjustment of relevant work parameter by the frequency switching and the pressure regulation potentiometer of pulsed magnetic field generating means.
3, alloy carries out the fusing and the refining of alloy through after preparing burden according to the alloy melting system in melting furnace, then temperature is adjusted to suitable pouring temperature, and is to be cast.
4, before cast, chute, tundish and the semi-continuous casting crystallizer of alloy melt carried out abundant preheating, for the almag semi-continuous casting, chute and tundish are preheated to 600 ℃, and crystallizer is preheated to 400～600 ℃.
5, alloy melt is poured in the crystallizer, starts the dummy ingot device, pull out strand downwards.In the time of cast, the starting impulse field generator for magnetic, magnetic field impulse acts on alloy melt by placing the outer field solenoid of crystallizer.By regulating semi-continuous casting speed, make it to be complementary with the magnetic field impulse effect.
6, along with the carrying out of alloy melt cast and process of billet withdrawal, pull out semicontinuous thin brilliant ingot casting in the bottom of crystallizer.
The utlity model has following advantage:
1. magnetic field impulse voltage is low, and handling safety is reliable;
2. pulse interval work, energy resource consumption is little, and technology is simple, easy to operate, be easy to control;
3. under the magnetic field impulse effect, the alloy melt motion is steady, and bath surface can not destroyed, and effectively avoids the air-breathing and slag inclusion of metal, improves the quality of products;
4. but the pulse frequency free adjustment makes it to be complementary with casting speed, gives full play to the magnetic field impulse effect, produces big specification fine-grained ingot base.
5. pollution-free, tissue thinning effect is remarkable, and it is wide to be suitable for alloys range, can be used for non-ferrous metal and alloys such as magnesium alloy, aluminium alloy.
Description of drawings
Fig. 1 is a magnetic field impulse semi-continuous casting principle schematic; Wherein, 1 alloy melting stove; 2 crystallizers; 3 solenoids; 4 strands; 5 dummy ingot devices; 6 alloy melts; 7 pulsed magnetic field generating means.
Fig. 2 is the influence of pulsed magnetic field to AZ91D magnesium alloy ingot solidified structure; Wherein, (a) be respectively the upper, middle and lower tissue that solidifies ingot casting under the pulsed magnetic field action; (b) be respectively the upper, middle and lower tissue that ingot casting is solidified in no pulse magnetic field.
Fig. 3 is an AZ91D ingot casting grain size distribution under the pulsed magnetic field; Wherein, (a) heart portion longitudinal section; (b) cross section in.
The specific embodiment
Below in conjunction with specific embodiment embodiment of the present utility model is described further:
As shown in Figure 1, the utility model is introduced the magnetic field impulse effect in the semi-continuous casting process, and the alloy melt in the crystallizer is solidified under pulsed magnetic field action.Magnetic field impulse is handled semi-continuous casting device and is comprised semicontinuous casting machine, pulsed magnetic field generating means, magnetic field impulse action system (solenoid) three parts, semicontinuous casting machine is alloy melting stove 1, crystallizer 2, strand 4, dummy ingot device 5, alloy melt 6 formations, crystallizer 2 is installed in alloy melt 6 outsides of flowing out in alloy melting stove 1, crystallizer 2 arranged outside solenoids 3, pulsed magnetic field generating means 7 links to each other with solenoid 3, alloy melt 6 behind crystallizer 2 is frozen into strand 4, and strand 4 bottoms are provided with dummy ingot device 5.Current impulse is produced by pulsed magnetic field generating means 7, produce pulsed magnetic field through being positioned at crystallizer 2 outer field solenoids 3, act on the strand 4 of the even refinement of alloy melt 6 formative tissues in the crystallizer, realize the alloy melt semi-continuous casting under the magnetic field impulse effect.The utility model relates to semicontinuous casting machine and pulsed magnetic field generating means, but the parameter free adjustment of pulsed magnetic field, the alloy of variety classes, composition exists optimal parameter scope (determining according to experiment), the casting speed of semicontinuous casting machine is 30～170mm/min, can regulate arbitrarily, and match with the magnetic field impulse parameter and to select best casting speed, the magnetic field impulse action system places semi-continuous casting crystallizer outside, is close to the crystallizer outer surface.
The AZ91D magnesium alloy is melted in the alloy melting stove and refining,, guarantee that the alloy liquid temp is even, to be cast 720 ℃ of insulations 20 minutes.The crystallizer diameter of semicontinuous casting machine is 100mm, according to alloy species, pouring temperature and ingot casting diameter, the strobe pulse magnetic field parameter is that pulsed magnetic field generation voltage is 200V, pulse frequency is 5Hz, the semi-continuous casting speed that is complementary is 90mm/min, sets parameter respectively on pulsed magnetic field generating means and semicontinuous casting machine.Before cast, chute, tundish and the semi-continuous casting crystallizer of alloy melt fully toasted, and make chute and tundish be baked to 600 ℃, crystallizer is baked to 400～600 ℃.After alloy chute, tundish and crystallizer toasted, open the cooling water system of chute protective gas and crystallizer, open the magnesium alloy pouring stem bar, begin cast.Simultaneously, start the dummy ingot device and the pulsed magnetic field generating means of semicontinuous casting machine.In casting process, keep the stable of the interior liquid level of tundish.After alloy melt pours in the stove, close magnesium alloy pouring stem bar and pulsed magnetic field generating means, and in system, continue to feed protective gas (as argon gas etc.) and finish up to casting, close semicontinuous casting machine.
Fig. 2 is that the diameter that does not apply pulsed magnetic field and apply 5Hz, 200V pulsed magnetic field is the solidified structure contrast of the AZ91D magnesium alloy ingot of 100mm.As seen from Figure 2, do not add that AZ91D ingot casting longitudinal section heart portion is thick dendrite under the pulsed magnetic field condition, the top crystallite dimension is bigger, and limit portion and heart portion crystallite dimension change greatly the inhomogeneous eutectic structure skewness that causes of crystallite dimension.And during applying pulse magnetic field, the solidified structure crystallite dimension reduces, the longitudinal section even tissue, and crystallite dimension is roughly the same, and tissue topography is a rosiness, and limit portion and heart portion crystallite dimension change little, and eutectic structure is evenly distributed.
Fig. 3 is an AZ91D ingot casting grain size distribution, as can be seen, and under the no pulse magnetic field condition, the crystallite dimension of ingot casting heart portion is 140～476 μ m, and limit portion and center crystallite dimension differ bigger, apply pulsed magnetic field after, the crystallite dimension of ingot casting is 160～210 μ m, structure refinement and even.
The A356 aluminium alloy is melted in the alloy melting stove and refining,, guarantee that the alloy liquid temp is even, to be cast 750 ℃ of insulations 20 minutes.The crystallizer diameter of semicontinuous casting machine is 80mm, the strobe pulse magnetic field parameter is that pulsed magnetic field generation voltage is 200V, pulse frequency is 5Hz, and the semi-continuous casting speed that is complementary is 50mm/min, sets parameter respectively on pulsed magnetic field generating means and semicontinuous casting machine.Before cast, chute, tundish fully are baked to 600 ℃.During cast, open the cooling water system of crystallizer, open the cast stem bar, begin cast, start the dummy ingot device and the pulsed magnetic field generating means of semicontinuous casting machine simultaneously.In casting process, keep the stable of the interior liquid level of tundish.After alloy melt pours in the stove, close cast stem bar and pulsed magnetic field generating means.Pull out from crystallizer up to ingot casting, close semicontinuous casting machine, be prepared into the thin brilliant ingot casting of A356 aluminium alloy.
Embodiment result shows that the utility model solidifies the low lift pump impulse action and is applied in the semi-continuous casting, has proposed magnetic field impulse and has handled semi-continuous casting device.The process of setting of low lift pump impulse action alloy melt in semi-continuous casting not only can prepare all even and fine brilliant ingot casting, remarkable thinning solidification structure, and have pollution-free, energy savings, easy and simple to handle, reduce cost and characteristics and advantage such as investment.
Claims (2)
1, a kind of magnetic pulse semi-continuous casting device, it is characterized in that: this casting device comprises semicontinuous casting machine, the pulsed magnetic field generating means, magnetic field impulse action system three parts, semicontinuous casting machine is the alloy melting stove, crystallizer, strand, the dummy ingot device, alloy melt constitutes, the magnetic field impulse action system places the crystallizer outside, be close to the crystallizer outer surface, the pulsed magnetic field generating means links to each other with the magnetic field impulse action system, the alloy melt that flows out from the alloy melting stove is through crystallizer, be frozen into strand under pulsed magnetic field action, the strand bottom is provided with the dummy ingot device.
2, according to the described magnetic pulse semi-continuous casting device of claim 1, it is characterized in that: the magnetic field impulse action system is a solenoid.
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| CNU2008202195803U CN201291295Y (en) | 2008-11-19 | 2008-11-19 | Magnetic pulse semi-continuous casting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112496281A (en) * | 2020-12-10 | 2021-03-16 | 东北大学 | Split type electromagnetic semi-continuous casting crystallizer and application method |
| CN115365468A (en) * | 2022-07-22 | 2022-11-22 | 有研金属复材技术有限公司 | Semi-continuous casting system and casting method for ingot casting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112496281A (en) * | 2020-12-10 | 2021-03-16 | 东北大学 | Split type electromagnetic semi-continuous casting crystallizer and application method |
| CN115365468A (en) * | 2022-07-22 | 2022-11-22 | 有研金属复材技术有限公司 | Semi-continuous casting system and casting method for ingot casting |
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