CN104707960B - A kind of meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting apparatus and method - Google Patents
A kind of meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting apparatus and method Download PDFInfo
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- CN104707960B CN104707960B CN201310693271.5A CN201310693271A CN104707960B CN 104707960 B CN104707960 B CN 104707960B CN 201310693271 A CN201310693271 A CN 201310693271A CN 104707960 B CN104707960 B CN 104707960B
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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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- 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
- B22D11/14—Plants for continuous casting
- B22D11/141—Plants for continuous casting for vertical casting
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Abstract
The present invention relates to a kind of meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting apparatus and method, belong to metal material continuously casting field.This device is made up of chute, hot top, plug fixed support, plug, crystallizer, water jacket, induction coil and bed die；Chute is arranged at the top of hot top, and hot top is arranged at the top of water jacket；Hot top middle setting plug, plug is arranged in the middle of hot top by being fixed on the plug fixed support of its bottom, and plug comprises cooling unit；Water jacket is arranged at outside crystallizer, and induction coil is located at the centre of the outside water jacket of crystallizer, induction coil slant setting, and the radial direction electromagnetic push of generation is parallel with meniscus, and whole device is in vertical.Whole fluid defines recycle stream in circular seam type hot top and crystallizer, the radial thrust strengthening along meniscus that the sensed coil of this recycle stream produces, meniscus radial direction Strong shear, alleviate strand radial temperature component difference, increased equiaxial crystal ratio, improve morphology of primary phase.
Description
Technical field
The present invention relates to a kind of meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting apparatus and method, it is primarily adapted for use in system
Standby high equiaxial crystal ratio round billet or semisolid circular blank, belong to metal material continuously casting field.
Background technology
Conticaster is Metallurgical Industry continuous casting process capital equipment, with the progress of social development and science and technology, to casting
Base internal soundness, particularly casting blank solidification tissue equiaxial crystal ratio and morphology of primary phase are put forward higher requirement.Electromagnetic agitation skill
Art is a kind of effective means that metal solidification process is controlled, and has a wide range of applications and deep industrial foundation.
The electromagnetic mixing apparatus of continuous casting cast steel mainly have revolving-field type, travelling-magnetic-field type and radial magnetic field type etc. many at present
Type, using most be first two.Revolving-field type electromagnetic mixing apparatus use asynchronous motor three phase rotating field former
Reason, so that not solidified metal bath rotates as three-phase asynchronous motor rotor, reaches the purpose of stirring, such as
US4016926.Based on the stirring action that revolving-field type agitating device produces is circulated with circumference, the radial flow of meniscus is
Secondary stream.The operation principle of travelling-magnetic-field type agitating device is also similar with induction conductivity, if stator core being cut and opening up
It is split into straight line, that is, produce the travelling-magnetic-field by sinusoidal rule change.In metal bath, generation one is consistent with travelling-magnetic-field direction
Electromagnetic force, such as US5219018.Different according to the arrangement of travelling-magnetic-field type agitating device, can produce axially in metal bath
Circulate, circumference circulates and helical flow, the radial flow of meniscus is similarly secondary stream.Revolving-field type stirring dress
Put and be required for iron core with travelling-magnetic-field type agitating device, and radial magnetic field type agitating device belongs to coreless induction electromagnetic agitation, this
The motionless pulsation alternating magnetic field in kind of space can produce repulsion stirring, and mixing power is radial thrust, such as US4229210 and using single
The coreless induction furnace of phase coil, produces standing wave so as to local produces strong convection in metal bath.Radial magnetic field type agitator
Another application be to lower between metal bath and mold to obtain contact pressure, such as US4723591 or replace mold, realize magnetic
Constraint shapes, such as electromagnetic casting.US5135564 it is also proposed a kind of circumferential weld structure, and this device is primarily to avoid because collecting skin
Effect and the relatively low part of the electromagnetic force that produces, and strengthen peripheral flow because radial dimension diminishes.
Content of the invention
It is an object of the invention to provide a kind of meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting apparatus and method.
A kind of meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting device, this device is by chute, hot top, fixing of plug
Frame, plug, crystallizer, water jacket, induction coil and bed die composition；Described chute is arranged at the top of hot top, described hot top
It is arranged at the top of water jacket；Described hot top middle setting plug, described plug is fixed by being fixed on the plug of its bottom
Support is arranged in the middle of hot top, and described plug comprises cooling unit；Described water jacket is arranged at outside crystallizer, described sensing
Coil is located at the centre of the outside water jacket of crystallizer, described induction coil slant setting, the radial direction electromagnetic push of generation with curved
Lunar surface is parallel, and whole device is in vertical.
Described plug forms circular seam type hot top with hot top, adjusts circumferential weld width and slurrying by changing plug size
Room height；Plug radius is less than or equal to 1/2 hot top radius it is considered to practical operation facility, and plug radius is more than 10mm；Plug height
More than 1/2 hot top height, less than 1 times of hot top height.
Described plug and plug fixed support material are the low thermal conductivity material such as aluminium silicate, refractory fibre；Described is cold
But unit is to be arranged at the cooling duct being connected with cooling medium inside plug, the material of cooling duct is austenitic stainless steel, titanium,
The nonmagnetic substances such as molybdenum, cobalt, chromium, nickel and copper；Cooling medium is the non-magnetic fluid such as empty gas and water.
Induction coil slant setting, induction coil material is the high electrical conductivity materials such as copper, one layer of insullac of external coating, line
Ring cross-section can be ellipse or rectangle etc.；Coil angle of inclination is 0～90 degree；Frequency is 1～50Hz.
The external diameter of described bed die is identical with crystallizer internal diameter, is placed in crystallizer being used for downward throwing.
Using the said equipment, the method carrying out meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting, including：First the bottom of by
Mould is placed in crystallizer and blocks up sternly pulping chamber, then opens cooling water, metal bath is injected chute；When melt by chute through ring
When seam hot top enters crystallizer, melt starts to solidify, and forms initial solidification shell, and green shell solidification front forms meniscus, meanwhile,
Traction bed die, carries out process of billet withdrawal, green shell moves down, and progressive additive, finally completes solidification, so that continuous casting is able to continuously downwards
Carry out；After equipment is stablized, open electromagnetic agitation, induction coil produces the radial thrust along meniscus it is achieved that radially cutting by force
Cut, meniscus can become flat.
In casting process, alloy melt is flowed rapidly into crystallizer through circular seam type hot top and formed at a high speed axially by chute
Stream；Radiated by plug, reduce the degree of superheat, be crystallized device and once cool down；After casting process is stable, melt solidification front forms curved
Lunar surface；Induction coil loads biphase low-frequency ac electric current, produces the electromagnetic push parallel with meniscus；Ingot casting is by jacket water
Cooling, carries out throwing by bed die, completes process of billet withdrawal by haulage gear.
The axial stream of high speed is changed into radial flow after encountering meniscus, the sensed coil of radial flow produce along meniscus
Radial thrust strengthening is it is achieved that radial direction Strong shear；Melt is solidified strand cooling twice.
Radial flow converges to formation recirculating zone during centre, increased the heat convection of melt and plug, also increases simultaneously
Add the mixing of cold and hot melt below circular seam type hot top.Whole fluid achieves circulation in circular seam type hot top and crystallizer.
The main technical principle that the present invention adopts：In the centrally disposed plug of the hot top of casting apparatus, hot top and plug are formed
Circular seam type hot top structure.Circular seam type hot top improves the axial direction stream of melt because of constancy of volume principle in melt casting process
Dynamic, this axially stream is changed into radial flow after running into meniscus, and tilted-putted induction coil produces parallel with meniscus
Electromagnetic force, enhances the radial shear stream on meniscus, and radial flow converges to formation recirculating zone during centre, increased melt
With the heat convection of plug, also increase the mixing of cold and hot melt simultaneously.Whole fluid shape in circular seam type hot top and crystallizer
Become axisymmetric recycle stream.The radial thrust strengthening along meniscus that the sensed coil of this recycle stream produces is it is achieved that footpath
To Strong shear.Promote flowing and the heat transfer of alloy melt by said method, the temperature field of melt with become branch to tend to uniform,
Be conducive to obtaining high-quality strand.
Compared with prior art, it is an advantage of the invention that：
(1) present invention is changed into circular seam type hot top by plug hot top, increased the axial direction stream in hot top, low cost, behaviour
Make simple and practical.
(2) induction coil is single phase winding, and fabrication and installation are simple, using intermediate frequency power supply, need not complicated power-supply device.
(3) meniscus radial direction Strong shear, alleviates strand radial temperature component difference, increased equiaxial crystal ratio, improve
Morphology of primary phase.
Brief description
Fig. 1 is the schematic diagram of meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting device of the present invention.
Fig. 2 is induction coil schematic diagram.
Fig. 3 is mandrel holder schematic diagram.
Main Reference Numerals：
1 plug fixed support 2 chute
3 hot top 4 plug
5 water jacket 6 induction coil
7 crystallizer 8 ingot casting
9 bed dies
Specific embodiment
As shown in figure 1, the meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting device of the present invention, by chute 2, hot top 3,
Plug fixed support 1, plug 4, crystallizer 7, water jacket 5, induction coil 6 and bed die 9 form；Chute 2 is arranged at the upper of hot top 3
Portion, hot top 3 is arranged at the top of water jacket 5；Hot top 3 middle setting plug 4, plug 4 is solid by the plug being fixed on chute 2 bottom
Fixed rack 1 is arranged in the middle of hot top 3, and plug 4 comprises cooling unit；Water jacket 5 is arranged at outside crystallizer 7, and induction coil 6 is located at knot
The centre of the outside water jacket 5 of brilliant device 7, induction coil 6 slant setting, the radial direction electromagnetic push of generation is parallel with meniscus, entirely
Device is in vertical.
Plug 4 forms circular seam type hot top with hot top 3, changes circumferential weld width and pulping chamber height by changing plug 4；Core
Excellent 4 radiuses are less than or equal to 1/2 hot top 3 radius it is considered to practical operation facility, and plug 4 radius is more than 10mm；Plug 4 height is more than
1/2 hot top 3 height, less than 1 times of hot top 3 height.
It is illustrated in figure 3 plug fixed support 1, plug 4 and plug fixed support 1 material are aluminium silicate, refractory fibre is low
Thermally conductive materials；Cooling unit is to be arranged at the cooling duct being connected with cooling medium inside plug 4, and the material of cooling duct is Austria
The nonmagnetic substances such as family name's body rustless steel, titanium, molybdenum, cobalt, chromium, nickel and copper；Cooling medium is the non-magnetic fluid such as empty gas and water.
As shown in Fig. 2 induction coil 6 slant setting, induction coil 6 material is the high electrical conductivity materials such as copper, external coating
One layer of insullac, coil section can be ellipse or rectangle etc.；Coil angle of inclination is 0～90 degree；Frequency be 1～
50Hz.
The external diameter of bed die 9 is identical with crystallizer 7 internal diameter, is placed in crystallizer 7 being used for downward throwing.
Use bed die 9 to block up sternly pulping chamber in suitably highly going up of crystallizer 7 first, then open cooling water, immediately metal
Melt injects chute 2.Because hot top 3 is made with insulation material, therefore, melt will not solidify in hot top 3.When melt enters knot
During brilliant device 7, melt starts to solidify, and forms initial solidification shell, and meanwhile, traction bed die 9, carries out process of billet withdrawal downwards.With throwing
The carrying out of process, green shell moves down, and progressive additive, finally completes solidification, i.e. throwing by bed die 9, by haulage gear
Complete process of billet withdrawal, so that continuous casting is constantly carried out.With the carrying out of process of billet withdrawal, hot top 3, plug 4 and bed die 9 temperature all can
Raise.When pull out 1m about blank when, equipment is basicly stable, open electromagnetic agitation.With the carrying out of electromagnetic agitation process, curved
Lunar surface can become flat.Additionally need according to cast melt temperature, decide whether to enable the cooling unit in plug 4, and use
Great rate of cooling.
In casting process, alloy melt flows rapidly into crystallizer 7 from chute 2 through circular seam type hot top and is formed at a high speed axially
Stream；Radiated by plug 4, reduce the degree of superheat, be crystallized device 7 and once cool down；After casting process is stable, melt solidification front is formed
Meniscus；Induction coil 6 loads biphase low-frequency ac electric current, produces the electromagnetic push parallel with meniscus；Ingot casting 8 is by jacket-cooled
But water cooling, carries out throwing by bed die 9, completes process of billet withdrawal by haulage gear.
The axial stream of high speed is changed into radial flow after encountering meniscus, the sensed coil of radial flow 6 produce along meniscus
Radial thrust strengthening it is achieved that radial direction Strong shear；Melt is solidified strand cooling twice.When radial flow converges to centre
Form recirculating zone, increased the heat convection of melt and plug 4, also increase the cold and hot melt in circular seam type hot top 3 lower section simultaneously
Mixing.Whole fluid achieves circulation in circular seam type hot top 3 and crystallizer 7.
Below taking the semisolid round billet preparing a diameter of 200mm as a example, to further illustrate meniscus radial direction Strong shear electricity
Magnetic stirs round billet continuous casting apparatus and method.
Prepare the semisolid round billet of a diameter of 200mm using meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting device,
For A357 alloy it is desirable to casting billet surface roughness is less than 0.25, following process is not required to peeling and processes material, n on-dendritic ratio in strand
Rate is more than 70%, and average grain size is less than 150 microns, as semi-solid die casting.
First, in suitably highly going up of crystallizer 7, pulping chamber is blocked up sternly with bed die 9, then open cooling water, and pre- hot-fluid
Groove 2.Wherein hydraulic pressure is 0.05MPa, and chute 2 preheating temperature is 400 DEG C.Then by A357 alloy melt qualified for melting 680
DEG C continuously it is poured in chute 2, start haulage gear with the speed throwing of 2.5mm/s simultaneously, ensure in casting process
Melt keeps constant altitude in chute 2.After 5 minutes, start agitator, stirring frequency is 5Hz, electric current is 35A.This is implemented
During cooling unit in not actuated plug 4, do not have bleedout and tensile phenomenon to occur, blank surface is smooth, and tissue obtains bright
Aobvious improvement, n on-dendritic phase is graininess, and in strand, n on-dendritic ratio is up to 90%, and average grain size is less than 100 microns.Grand
Seeing in tissue does not have columnar zone and gross segregation；Grip good after post bake, Cutting free；Its tissue and performance are completely full
Sufficient semi-solid processing requires.
During cast, metal bath flows rapidly into crystallizer 7 from chute 2 through circular seam type hot top 3, first passes through plug 4 and radiates,
Reduce the degree of superheat, be then crystallized device 7 wall and once cool down；After encountering meniscus, axially circulation becomes radial flow, and is solidified casting
Base cooling twice；Radial flow converges to formation recirculating zone during centre, increased the heat convection of melt and plug, simultaneously
Increased the mixing of cold and hot melt.Whole fluid defines recycle stream in circular seam type hot top 3 and crystallizer 7.This recycle stream
The radial thrust strengthening along meniscus that sensed coil produces is it is achieved that radial direction Strong shear.Strand 8 is cold by jacket water
But, throwing by bed die 9, completes process of billet withdrawal by haulage gear.
Claims (7)
1. a kind of meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting device it is characterised in that：Solid by chute, hot top, plug
Fixed rack, plug, crystallizer, water jacket, induction coil and bed die composition；Described chute is arranged at the top of hot top, described
Hot top is arranged at the top of water jacket；Described hot top middle setting plug, described plug is by being fixed on the plug of its bottom
Fixed support is arranged in the middle of hot top, and described plug comprises cooling unit；Described water jacket is arranged at outside crystallizer, described
Induction coil is located at the centre of the water jacket outside crystallizer, described induction coil slant setting, the radial direction electromagnetic push of generation
Parallel with meniscus, whole device is in vertical.
2. meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting device according to claim 1 it is characterised in that：Described
Plug and hot top form circular seam type hot top, adjust circumferential weld width and pulping chamber height by changing plug size.
3. meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting device according to claim 2 it is characterised in that：Described
Plug radius be less than or equal to 1/2 hot top radius, described plug height is more than 1/2 hot top height, less than hot top height.
4. meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting device according to claim 1 it is characterised in that：Described
Plug and plug fixed support material be aluminium silicate or refractory fibre.
5. meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting device according to claim 4 it is characterised in that：Described
Cooling unit be to be arranged at the cooling duct being connected with cooling medium inside plug, the material of cooling duct is austenite stainless
Steel, titanium, molybdenum, cobalt, chromium, nickel or copper；Cooling medium is air or water.
6. meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting device according to claim 1 it is characterised in that：Described
One layer of insullac of induction coil external coating, induction coil section is oval or rectangle, and material is copper, and induction coil inclines
Rake angle is 0～90 degree, and frequency is 1～50Hz.
7. a kind of meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting method, including：First bed die being placed in crystallizer will
Pulping chamber blocks up sternly, then opens cooling water, metal bath is injected chute；When melt enters crystallization through chute through circular seam type hot top
During device, melt starts to solidify, and forms initial solidification shell, and green shell solidification front forms meniscus, meanwhile, draws bed die downwards, enters
Row process of billet withdrawal, green shell moves down, and progressive additive, finally completes solidification, so that continuous casting is carried out continuously；When equipment is stable
Afterwards, open electromagnetic agitation, induction coil produces radial thrust along meniscus it is achieved that radial direction Strong shear.
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| CN201310693271.5A CN104707960B (en) | 2013-12-17 | 2013-12-17 | A kind of meniscus radial direction Strong shear electromagnetic agitation round billet continuous casting apparatus and method |
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| BR112019014882B1 (en) | 2017-02-10 | 2022-03-03 | Abb Schweiz Ag | Furnace assembly for a metal production process |
| CN115446271A (en) * | 2022-09-02 | 2022-12-09 | 北京科技大学 | Bidirectional electromagnetic stirring device for molten steel casting |
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|---|---|---|---|---|
| JPS61140357A (en) * | 1984-12-11 | 1986-06-27 | Kobe Steel Ltd | Electromagnetic stirring method of weakly deoxidized steel in continuous casting of slab |
| CN2415863Y (en) * | 1999-12-16 | 2001-01-24 | 上海大学 | Metal soft contact electromagnetic continuous casting compound crystallizer |
| CN1425520A (en) * | 2002-10-25 | 2003-06-25 | 东北大学 | Alumium alloy low frequency electromagnetic semi-continuous casting method and device |
| CN202106003U (en) * | 2011-03-22 | 2012-01-11 | 天津福来明思铝业有限公司 | Device for producing hypereutectic silicon-aluminum alloy casting ingot |
| CN102990027A (en) * | 2012-12-31 | 2013-03-27 | 上海大学 | Low-energy-consumption electromagnetic stirring method for continuous casting and metal continuous casting device |
| CN203610632U (en) * | 2013-12-17 | 2014-05-28 | 北京有色金属研究总院 | Crescent face radial high-shearing electromagnetic stirring round blank continuous casting device |
-
2013
- 2013-12-17 CN CN201310693271.5A patent/CN104707960B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61140357A (en) * | 1984-12-11 | 1986-06-27 | Kobe Steel Ltd | Electromagnetic stirring method of weakly deoxidized steel in continuous casting of slab |
| CN2415863Y (en) * | 1999-12-16 | 2001-01-24 | 上海大学 | Metal soft contact electromagnetic continuous casting compound crystallizer |
| CN1425520A (en) * | 2002-10-25 | 2003-06-25 | 东北大学 | Alumium alloy low frequency electromagnetic semi-continuous casting method and device |
| CN202106003U (en) * | 2011-03-22 | 2012-01-11 | 天津福来明思铝业有限公司 | Device for producing hypereutectic silicon-aluminum alloy casting ingot |
| CN102990027A (en) * | 2012-12-31 | 2013-03-27 | 上海大学 | Low-energy-consumption electromagnetic stirring method for continuous casting and metal continuous casting device |
| CN203610632U (en) * | 2013-12-17 | 2014-05-28 | 北京有色金属研究总院 | Crescent face radial high-shearing electromagnetic stirring round blank continuous casting device |
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Effective date of registration: 20210723 Address after: 101407 No.11, Xingke East Street, Yanqi Economic and Technological Development Zone, Huairou District, Beijing Patentee after: Youyan metal composite technology Co.,Ltd. Address before: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee before: YOUYAN ENGINEERING TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |
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