CN104550798A - Aluminum alloy semi-continuous cast electromagnetic stirring device and method - Google Patents
Aluminum alloy semi-continuous cast electromagnetic stirring device and method Download PDFInfo
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- CN104550798A CN104550798A CN201510019474.5A CN201510019474A CN104550798A CN 104550798 A CN104550798 A CN 104550798A CN 201510019474 A CN201510019474 A CN 201510019474A CN 104550798 A CN104550798 A CN 104550798A
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- aluminum alloy
- alloy semi
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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Abstract
The invention relates to an aluminum alloy semi-continuous cast electromagnetic stirring device and method. The aluminum alloy semi-continuous cast electromagnetic stirring device comprises a launder used for holding melt, a crystallizer is arranged blow the launder, a cooling water spray zone is arranged at the lower outlet of the crystallizer, permanent magnets are arranged at the outer side of the crystallizer in pairs, a graphite electrode is inserted in the melt, a plurality of sliding electrodes are arranged below the cooling water spray zone, and the graphite electrode and sliding electrodes are respectively connected with two electrodes of a pulse direct current power supply. The aluminum alloy semi-continuous cast electromagnetic stirring device uses the principle that current undergoes ampere force in a magnetic field and combines direct current with permanent magnets, the flow modes and flow intensities of different melts in the crystallizer region are designed according to sizes, shapes and material components of aluminum ingots, and segregation behaviors of alloying elements and growth patterns of dendritic crystals are controlled to realize microstructure homogenization and refining.
Description
Technical field
The present invention relates to casting field of metallurgy, particularly relate to a kind of aluminum alloy semi-continuous casting electromagnetic mixing apparatus and method.
Background technology
The aluminum melt stirring technique of current industrial application is divided into two kinds: mechanical type stirs and contactless stirring.Contactless stirring mainly utilizes the action principle in magnetic field to design, and wherein comprises again two kinds of processes: rotary electromagnetic field formula and permanent magnet type.
Wherein, the electromagnetic force utilizing rotary electromagnetic field to induct in the melt carries out strong stirring to melt, has become the common method of homogenising melt and crystal grain thinning tissue in aluminum alloy melting and semi-continuous casting process, has obtained long-term commercial Application.But because the kelvin effect of rotary electromagnetic field and the restriction of installation (need the region of stirring to be positioned at crystallizer altitude range, in order to ensure completing smoothly of casting process, stirring coil can only be arranged on crystallizer periphery, cause the mispairing in magnetic field intensity and interacting goals region, ingot casting central area can not get desirable mixing effect), do not reach best effects; Be difficult to bottom this external most important liquid cave produce effectively stir.
And permanent magnetism aluminium liquid agitator, be that the alternating magnetic field produced after utilizing the permanent magnet of particular combination to move carries out noncontact stirring to metal liquid.Permanent magnetic stirrer is equivalent to the motor of the very large use magnetic field of permanent magnet of air gap, and inductor is equivalent to the stator of motor, and aluminum melt is equivalent to the rotor of motor.The built-in multipole magnetic field of agitator produces travelling-magnetic-field under the drive of motor, and the metal liquid in magnetic field and molten bath interacts and produces magnetic force, thus promotes metal liquid and do directed movement, plays the effect of stirring.Obviously, this mode can not generation effect rapidly, and the type of flow formed is uncontrollable, the motion of part melt is not driven by electromagnetic force, but the drag caused by the viscosity of melt drive, be not suitable for by this way being applied on bath composition homogenising in semi-continuous casting process and structure refinement, the time that its flowing is formed is longer, can not adapt to semi-continuous casting setting rate at a high speed.
Summary of the invention
The invention provides a kind of aluminum alloy semi-continuous casting electromagnetic mixing apparatus and method, to solve the problems of the technologies described above.
For solving the problems of the technologies described above, the invention provides a kind of aluminum alloy semi-continuous casting electromagnetic mixing apparatus, comprise the chute for carrying melt, crystallizer is provided with below described chute, the lower exit of described crystallizer is provided with cooling water inlet zone, is provided with permanent magnet in pairs outside described crystallizer, is plugged with graphite electrode in described melt, the below of described cooling water inlet zone is provided with some sliding electrodes, and described graphite electrode and sliding electrode are connected to the two poles of the earth of pulse dc power respectively.
Preferably, described permanent magnet provides magnetic field, the system that described chute, crystallizer, melt and casting machine form and external insulation for electromagnetic agitation.
Present invention also offers a kind of aluminum alloy semi-continuous casting electromagnetic agitation method, be applied in aluminum alloy semi-continuous casting electromagnetic mixing apparatus as above, the shape of the aluminium ingot cast as required and organizational requirements, the size of current of regulating impulse dc source and direction, the position of permanent magnet and the position of quantity and sliding electrode and quantity.
Preferably, if the cross section of aluminium ingot is circular, then the permanent magnet of half-and-half type is adopted.
Preferably, if the cross section of aluminium ingot is rectangle, then the multiple permanent magnets be oppositely arranged are adopted.
Preferably, by the size of current of regulating impulse dc source, regulate the stirring intensity of melt.
Preferably, described pulse dc power adopts low-voltage and high-current.
Preferably, the size of current of described pulse dc power is 10A ~ 50A.
Compared with prior art, a kind of aluminum alloy semi-continuous casting electromagnetic mixing apparatus provided by the invention and method, this device comprises the chute for carrying melt, crystallizer is provided with below described chute, the lower exit of described crystallizer is provided with cooling water inlet zone, permanent magnet is provided with in pairs outside described crystallizer, graphite electrode is plugged with in described melt, the below of described cooling water inlet zone is provided with some sliding electrodes, and described graphite electrode and sliding electrode are connected to the two poles of the earth of pulse dc power respectively.The present invention utilizes electric current in magnetic field, be subject to the principle of Ampere force effect, adopt the method that DC current and permanent magnet combine, the type of flow of different melts in crystallizer region and flow strength can be designed according to the size of aluminium ingot, shape, material composition, control the segregation behavior of alloying element and the growth pattern of dendrite, reach the object of microstructure homogenization and refinement.
Accompanying drawing explanation
Fig. 1 is the structural representation of the aluminum alloy semi-continuous casting electromagnetic mixing apparatus of the embodiment of the invention;
Fig. 2 is the arrangement mode top view of permanent magnet and sliding electrode in the embodiment of the present invention one.
In figure: 10-chute, 11-melt, 12-aluminium ingot, 20-crystallizer, 30-cooling water inlet zone, 40-permanent magnet, 50-graphite electrode, 60-sliding electrode, 70-pulse dc power.
Detailed description of the invention
In order to the technical scheme of more detailed statement foregoing invention, below list specific embodiment and carry out Proof Technology effect; It is emphasized that these embodiments are not limited to for illustration of the present invention limit the scope of the invention.
A kind of aluminum alloy semi-continuous casting electromagnetic mixing apparatus provided by the invention, as shown in Figure 1, comprise the chute 10 for carrying melt 11, crystallizer 20 is provided with below described chute 10, the lower exit of described crystallizer 20 is provided with cooling water inlet zone 30, permanent magnet 40 is provided with in pairs outside described crystallizer 20, graphite electrode 50 is plugged with in described melt 11, the below of described cooling water inlet zone 30 is provided with some sliding electrodes 60, and described graphite electrode 50 and sliding electrode 60 are connected to the two poles of the earth of pulse dc power 70 respectively.Particularly, according to the formula of Ampere force, f=IBLsin α, wherein f is Ampere force, I is current value, and B is magnetic field intensity, and L is conductor length, α is the angle of magnetic field and the sense of current, it can thus be appreciated that current strength and magnetic field intensity are two principal elements affecting Ampere force: when magnetic field intensity one timing, by regulating the size and Orientation of electric current, intensity and the flow field parameter of stirring can be controlled, reach the object controlling mixing effect.The present invention utilizes electric current in magnetic field, be subject to the principle of Ampere force effect, adopt the method that DC current and permanent magnet 40 combine, the type of flow of different melts 11 in crystallizer 20 region and flow strength can be designed according to the size of aluminium ingot, shape, material composition, control the segregation behavior of alloying element and the growth pattern of dendrite, reach the object of microstructure homogenization and refinement.
Preferably, described permanent magnet provides magnetic field for electromagnetic agitation, and the system that forms of described chute 10, crystallizer 20, melt and casting machine and external insulation, that is, during casting, the equipment such as the alloy holding furnace contacted with whole device and casting machine all need to insulate with the earth, scatter and disappear to prevent electric current.
Present invention also offers a kind of aluminum alloy semi-continuous casting electromagnetic agitation method, be applied in aluminum alloy semi-continuous casting electromagnetic mixing apparatus as above, the shape of the aluminium ingot 12 cast as required and organizational requirements, the size of current of regulating impulse dc source 70 and direction, the position of permanent magnet 40 and the position of quantity and sliding electrode 60 and quantity.
Concrete workflow is as follows: when aluminium alloy casting starts, aluminium ingot 12 pulls out crystallizer 20, and the outer surface of aluminium ingot 12 contacts with described sliding electrode 60; Then open pulse dc power 70, meeting generation current between bath surface electrode (graphite electrode 50) and sliding electrode 60, under the effect of external magnetic field, in melt 11, form Ampere force, promote melt 11 and move, stir.Electrode position is different, and the sense of current is different, and the flow field of generation is just different; The intensity of electric current is different, and the mixing power size of generation is just different.Therefore can by the arrangement of adjustment sliding electrode 60, flowings different in design melt 11, to tackle various different aluminium ingot shape; Regulate the size of electric current, change the stirring intensity in melt 11.
Preferably, ask emphasis with reference to figure 2, and composition graphs 1, if the cross section of aluminium ingot 12 is circular, then adopt the permanent magnet 40 of half-and-half type; Preferably, if the cross section of aluminium ingot 12 is rectangle, then the multiple permanent magnets 40 be oppositely arranged are adopted.
Preferably, by the size of current of regulating impulse dc source 70, regulate the stirring intensity of melt 11, preferably, described pulse dc power 70 adopts low-voltage and high-current, to ensure production safety, particularly, the size of current of described pulse dc power 70 is 10A ~ 50A.
Provide 3 kinds of specific embodiments below:
Adopt the permanent magnet 40 that magnetic field intensity is 0.5T to provide magnetic field for stirring, the electric current that pulse dc power 70 produces is that 12V/50A is adjustable.
Embodiment one
To the billet of minor diameter (such as φ=180mm), please refer to Fig. 2, adopt the design of half-and-half type permanent magnet, sliding electrode 60 is two or four, arranges in pairs, and electric current adopts 10A, pulsed continuous current.For A356 alloy, crystallite dimension can be controlled in less than 50 microns.
Embodiment two
To the billet of major diameter (such as φ=500mm), adopt the design of half-and-half type permanent magnet, sliding electrode 60 is four or six, arranges in pairs, and electric current adopts 30A, pulsed continuous current.For 6016 alloys, crystallite dimension can be controlled in less than 100 microns.
Embodiment three
For large plate ingot (being such as of a size of 1300mm × 620mm), adopt the design of opposed type multipole magnet, long limit is designed 4-6 to sliding electrode 60, minor face designs 2 pairs of electrodes, electric current adopts 50A, the electric current that pulsed and polar cycle are put upside down, for balanced heavy in section melt 11 temperature, alloying elements distribution.6061 alloy grain size can be controlled below 300 microns.
In sum, a kind of aluminum alloy semi-continuous casting electromagnetic mixing apparatus provided by the invention and method, this device comprises the chute 10 for carrying melt 11, crystallizer 20 is provided with below described chute 10, the lower exit of described crystallizer 20 is provided with cooling water inlet zone 30, permanent magnet 40 is provided with in pairs outside described crystallizer 20, graphite electrode 50 is plugged with in described melt 11, the below of described cooling water inlet zone 30 is provided with some sliding electrodes 60, and described graphite electrode 50 and sliding electrode 60 are connected to the two poles of the earth of pulse dc power 70 respectively.The stirring that the present invention produces is not by the impact of kelvin effect, by at aluminium ingot bottom design sliding electrode 60, completely can the type of flow of melt 11 at place of control Ye Xue bottom centre and the flow strength of melt 11 and flow direction, in order to crystal grain thinning, suppress the segregation of alloying element simultaneously.Structure of the present invention is simple, and main working parts is not subject to temperatures involved, therefore long working life, and installation cost is low, and production cost is low, is applicable to the semi-continuous casting of high-performance aluminium alloy, high purity aluminum alloy.
Obviously, those skilled in the art can carry out various change and modification to invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (8)
1. an aluminum alloy semi-continuous casting electromagnetic mixing apparatus, comprise the chute for carrying melt, crystallizer is provided with below described chute, the lower exit of described crystallizer is provided with cooling water inlet zone, it is characterized in that, outside described crystallizer, be provided with permanent magnet in pairs, in described melt, be plugged with graphite electrode, the below of described cooling water inlet zone is provided with some sliding electrodes, and described graphite electrode and sliding electrode are connected to the two poles of the earth of pulse dc power respectively.
2. aluminum alloy semi-continuous casting electromagnetic mixing apparatus as claimed in claim 1, is characterized in that, described permanent magnet provides magnetic field for electromagnetic agitation, and the system that forms of described chute, crystallizer, melt and casting machine and external insulation.
3. an aluminum alloy semi-continuous casting electromagnetic agitation method, be applied to as in the aluminum alloy semi-continuous casting electromagnetic mixing apparatus in claim 1 ~ 2 as described in any one, it is characterized in that, the shape of the aluminium ingot cast as required and organizational requirements, the size of current of regulating impulse dc source and direction, the position of permanent magnet and the position of quantity and sliding electrode and quantity.
4. aluminum alloy semi-continuous casting electromagnetic agitation method as claimed in claim 3, is characterized in that, if the cross section of aluminium ingot is circular, then adopts the permanent magnet of half-and-half type.
5. aluminum alloy semi-continuous casting electromagnetic agitation method as claimed in claim 3, is characterized in that, if the cross section of aluminium ingot is rectangle, then adopt the multiple permanent magnets be oppositely arranged.
6. aluminum alloy semi-continuous casting electromagnetic agitation method as claimed in claim 3, is characterized in that, by the size of current of regulating impulse dc source, regulates the stirring intensity of melt.
7. aluminum alloy semi-continuous casting electromagnetic agitation method as claimed in claim 6, is characterized in that, described pulse dc power adopts low-voltage and high-current.
8. aluminum alloy semi-continuous casting electromagnetic agitation method as claimed in claim 7, it is characterized in that, the size of current of described pulse dc power is 10A ~ 50A.
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| CN201510019474.5A CN104550798A (en) | 2015-01-15 | 2015-01-15 | Aluminum alloy semi-continuous cast electromagnetic stirring device and method |
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| CN201510019474.5A CN104550798A (en) | 2015-01-15 | 2015-01-15 | Aluminum alloy semi-continuous cast electromagnetic stirring device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112004623A (en) * | 2018-04-27 | 2020-11-27 | 费尔有限公司 | Method for casting a melt of a metallic material and casting installation configured for implementing said method |
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| CN1219896A (en) * | 1996-05-13 | 1999-06-16 | 株式会社英比寿 | Method and apparatus for continuous casting |
| JP2012035287A (en) * | 2010-08-05 | 2012-02-23 | Aitekku Corporation:Kk | Method and device for manufacturing copper iron-based alloy cast slab |
| CN103212697A (en) * | 2013-04-12 | 2013-07-24 | 西北工业大学 | Casting mould method for improving casting aluminium alloy solidification structure by adopting variable-frequency low-voltage modulating pulse electric field |
| CN103459064A (en) * | 2011-11-10 | 2013-12-18 | 高桥谦三 | Mold device for continuous casting having stirring device |
| CN103600045A (en) * | 2013-11-18 | 2014-02-26 | 上海大学 | Continuous steel casting process and device with function of electromagnetic excitation compound mechanical stirring |
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2015
- 2015-01-15 CN CN201510019474.5A patent/CN104550798A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1219896A (en) * | 1996-05-13 | 1999-06-16 | 株式会社英比寿 | Method and apparatus for continuous casting |
| JP2012035287A (en) * | 2010-08-05 | 2012-02-23 | Aitekku Corporation:Kk | Method and device for manufacturing copper iron-based alloy cast slab |
| CN103459064A (en) * | 2011-11-10 | 2013-12-18 | 高桥谦三 | Mold device for continuous casting having stirring device |
| CN103212697A (en) * | 2013-04-12 | 2013-07-24 | 西北工业大学 | Casting mould method for improving casting aluminium alloy solidification structure by adopting variable-frequency low-voltage modulating pulse electric field |
| CN103600045A (en) * | 2013-11-18 | 2014-02-26 | 上海大学 | Continuous steel casting process and device with function of electromagnetic excitation compound mechanical stirring |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112004623A (en) * | 2018-04-27 | 2020-11-27 | 费尔有限公司 | Method for casting a melt of a metallic material and casting installation configured for implementing said method |
| US11484940B2 (en) | 2018-04-27 | 2022-11-01 | Fill Gesellschaft M.B.H. | Method for casting a melt of a metal material, and casting device designed for carrying out the method |
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