CN105108080B - Suppress the Semi-continuous casting crystallizer and its using method of magnesium alloy ingot blank cracking - Google Patents
Suppress the Semi-continuous casting crystallizer and its using method of magnesium alloy ingot blank cracking Download PDFInfo
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- CN105108080B CN105108080B CN201510472954.7A CN201510472954A CN105108080B CN 105108080 B CN105108080 B CN 105108080B CN 201510472954 A CN201510472954 A CN 201510472954A CN 105108080 B CN105108080 B CN 105108080B
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Abstract
Suppress the Semi-continuous casting crystallizer and its using method of magnesium alloy ingot blank cracking, belong to casting technology field, crystallizer includes inner sleeve, heat-insulation layer, cooling water tank, magnet exciting coil and crystallizer shell, heat-insulation layer is arranged on the top of the inwall of inner sleeve, or the top of outer wall is arranged on, or while it is arranged on the top of inner and outer wall；The embedded inner sleeve of inner thermal insulating layer is simultaneously bonded on inwall, and the embedded inner sleeve of external thermal insulation is simultaneously bonded on outer wall of inside race；Using method is：（1）Dummy ingot is risen in crystallizer；（2）Open cooling water and alternating current is passed through in magnet exciting coil；（3）The Lorentz force produced by magnet exciting coil is stirred to magnesium alloy fused mass；（4）Casting machine is opened after stable solidified shell is formed, ingot blank is pulled out into crystallizer.The method and apparatus of present invention design rationally, can be effectively reduced and easily split the crackle tendency of alloy ingot blank and big specification slab and round billet during semi-continuous casting.
Description
Technical field
The invention belongs to casting technology field, more particularly to a kind of semi-continuous casting crystallization for suppressing magnesium alloy ingot blank cracking
Device and its using method.
Background technology
Wrought magnesium alloy is the importance of Magnesium Alloy Industry application, in general, the section bar of magnesium alloy, sheet material and forging
Using the slab or round billet of prepared deformation by extruding, rolling or forging, the plastic deformation work such as extruding or plate rolling
Process is produced, therefore, slab or round billet prepare be wrought magnesium alloy deformation material production premise.Direct water-cooling casts（I.e. half
Continuously casting）Method is the technical method for being widely used in the casting of non-ferrous metal ingot blank；At present, the preparation of wrought magnesium alloy ingot blank
Also adopt the method；Unit volume specific heat, heat of fusion and thermal conductivity with aluminium phase ratio, magnesium and its alloy respectively may be about aluminum
70%, 95% and 20 ~ 65%, temperature diffusivity only has the 28 ~ 93% of aluminum.In casting process, magnesium alloy is because of low volume specific heat and eutectic
Change heat and make the position contacted with die wall easily because radiating is lowered the temperature acutely, and then warm ability is led and difficult because low away from die wall position
With heat transfer to the violent edge of lowering the temperature, so, the high-temperature gradient feature on magnesium alloy cast solidification direction causes magnesium
Generally individually there is larger casting internal stress in alloy graining；Therefore, casting internal stress is reduced, the generation for suppressing casting crack is magnesium
The important topic of alloy casting, wherein, inclined using the big specification magnesium alloy ingot blank of semicontinuous casting technique production or casting crack
During to serious magnesium alloy ingot blank, suppress along casting direction centre burst or edge cracks be technology controlling and process mainly consider because
One of element.
The technology such as patent CN101020229, CN101239371 and CN1460567 is by magnesium alloy semi-continuous casting
Apply the outfields such as electromagnetic field, ultrasonic field and combinations thereof in journey, and with reference to the adjustment of casting speed and casting temperature, can be significantly thin
Change the solidified structure of magnesium alloy ingot blank and suppress gross segregation, while also have the effect for significantly suppressing hot tearing, and it is big at home
Most magnesium alloy ingot blanks prepare enterprise and realize popularization and application；But, high rare earth of the above technology in hot cracking tendency especially severe
When prepared by magnesium alloy and ZK60 ingot blanks, or the slab of the super large standard round billet or big flakiness ratio in general AZ systems industrial magnesium alloys
When, which suppresses the action effect of hot tearing to be restricted.
Rare earth can significantly improve the intensity and thermostability of magnesium alloy, while also significantly improving the fire-retardant spy of magnesium alloy fused mass
Property, therefore, the high RE alloyed magnesium alloy with high-strength and high ductility and high heat resistance characteristic is paid high attention in recent years, and
Also remarkable break-throughs, and the bearing member manufacturer in the fields such as Aero-Space, war industry are obtained in terms of novel alloy exploitation
Face has potential important application, but the mode that such alloy practical application typically can only be cast with metal pattern at present prepares deformation
Blank, it is impossible to ensure metallurgical quality, easily causes casting flaw.As this is the serious hot tearing even cold cracking trend of alloy,
When preparing using the semi-continuous casting method of traditional direct water-cooling, Hot Cracking can be reduced by reducing secondary coolingwater, but
Effect is limited, therefore is more than such magnesium alloy of 10wt% to total amount of rare earth, it is difficult to obtain diameter or thickness more than the half of 200mm
Continuously casting Round Billet or flat ingot blank.Adopt the forced convertion effect that the electromagnetic casting method described in above-mentioned patent formed can be with
Thermograde is reduced, so as to realize the casting of diameter or thickness more than the ingot blank of 200 ~ 250mm, but for bigger specification ingot blank still
So there is certain difficulty, that is, be difficult to ensure that each heat occurs without hot tearing.
Due to the cost of raw material that high magnesium-rare earth is high, it is difficult to be widely applied in civilian industry, therefore, mesh
The front novel high-strength magnesium alloy exploitation for civilian site is the exploitation of the RE alloyed Mg-Zn systems alloy of not high mostly, and
Also a series of existing impressive progresses, such as ZC43X of Mg-Zn-Cu-X systems, the ZC33 of Mg-Zn-Ca-Zr systems etc., Mg-Zn-Mn systems
ZM61, and the MB25 and MB26 of Mg-Zn-Y-Zr systems etc.；However, similar to ZK60 magnesium alloys, the alloy such as ZC43X and ZC33 is also equal
There is more serious center casting crack tendency, and ZM61, MB25 and MB26 etc. then have the micro- radial cracking tendency of serious edge.
At present, this kind of alloy can only cast round billet, and slab is almost difficult to cast.
Further, since the less AZ systems magnesium alloy of hot cracking tendency, such as AZ31, AZ61, AZ80 and AZ91 etc. industry trade mark magnesium
Alloy, its Round Billet great majority using traditional semi-continuous casting method production, and can be had been realized in using electromagnetic casting method
Directly reach the Round Billet casting of 800mm；But as slab ingot heat transfer and the non-axis symmetry feature of solidification, casting stress are big, which is big
The casting of specification slab there is also obvious crackle tendency.
Magnesium alloy semi-continuous casting mainly has two methods：Hot-Top mould casts and inner metal sleeve mould casting；Heat
It is to use for reference aluminum alloy semi-continuous casting and the technical method that formed that direct casting is made, but due to magnesium alloy fused mass in high temperature to aluminium silicate
The hot top of material（Hot top）With high response, therefore, hot top is difficult to avoid the reaction because with Serum Magnesium completely（Especially
It is when there is partial combustion）, and pit is formed, not only contaminated melt, and being carried out continuously for casting is difficult to ensure that, therefore,
Industrial applications are not obtained；Inner metal sleeve structure crystalline device is the main method of magnesium alloy semi-continuous casting, but inner sleeve material
Copper and its alloy be experienced to the evolution of forging aluminium alloy；Magnesium alloy low frequency electromagnetic casting method widely used at present is adopted
With forging aluminium alloy material inner sleeve, not only contribute to reduce the Kelvin effect of electromagnetism, improve electromagnetic action effect, and have and compare copper
The much lower intensity of cooling of material, but compared with hot top, one cold strength is still very high.
A large amount of theories and practices show that reducing casting cooldown rate has the effect for substantially suppressing hot tearing and cold cracking；Drop
Low metal melt solidify completely before cooldown rate, particularly in high solid fractions, low cooldown rate, with substantially reduction
Stress concentration forms the effect of degree and synthesis speed；And the cooldown rate after reducing solidifying completely is then to high cold cracking inclination
Alloy is effective；For example, the casting of the serious 7XXX high strength alumin ium alloy ingot blanks of cold cracking trend, often through reduce by two it is cold and auxiliary in
The cold method of low-intensity three suppressing cold cracking, or made by the way of rubber water fender or air knife by two it is cold formed sculls it
Afterwards, make ingot casting backheat to reach online self annealing to realize casting the release of internal stress, it is to avoid cold cracking occurs.
Most of magnesium alloy casts are easy to hot tearing, and the only magnesium alloy in serious high-alloying just has cold cracking and sends out
Raw, as high magnesium-rare earth is the same, although also there is obvious cold cracking inclination, but hot tearing remains main.However, current magnesium
Alloy semi-continuous casting from Technology, suppresses the method for hot tearing but still mainly to borrow aluminum alloy holding poles casting suppresses cold
The method split, such as reduces the methods such as second cooling intensity, and has the control of a cool condition of material impact to magnesium alloy solidification hot tearing
System does not cause enough attention.
The content of the invention
The problems referred to above that magnesium alloy technology is present are produced for existing semi-continuous casting, the present invention provides one kind and suppresses magnesium to close
Ingot base cracking Semi-continuous casting crystallizer and its using method, by arrange crystallizer inner metal sleeve and heat-insulation layer,
In casting process based on a cool tone control and with two cold coordinations, suppress magnesium alloy hot tearing and cold cracking, improve high magnesium-rare earth
Deng magnesium alloy and the quality and lumber recovery of big specification ingot blank.
The present invention suppress magnesium alloy ingot blank cracking Semi-continuous casting crystallizer include inner sleeve, heat-insulation layer, cooling water tank,
Magnet exciting coil and crystallizer shell, heat-insulation layer are arranged on the top of the inwall of inner sleeve, or are arranged on the top of outer wall, or while set
Put in the top of inner and outer wall；The heat-insulation layer for being arranged on the top of outer wall is the top board bottom of external thermal insulation, its top and inner sleeve
Face connects, and the height of external thermal insulation is the 50 ~ 80% of inner sleeve height；It is inner thermal insulating layer to be arranged on the heat-insulation layer above inwall, its top
With inner sleeve top surface with height, the height of inner thermal insulating layer is the 50 ~ 80% of inner sleeve height at end；The embedded inner sleeve of inner thermal insulating layer is simultaneously bonded in interior
On wall, insert depth for sidewall of the inside race thickness 20 ~ 40%；The embedded inner sleeve of external thermal insulation is simultaneously bonded on outer wall of inside race, is embedded in deep
Spend 20 ~ 40% for sidewall of the inside race thickness.
The material of above-mentioned inner sleeve is aluminium alloy, rustless steel or copper alloy.
The material selection ceramic fiber paper of above-mentioned inner thermal insulating layer, and the side coating of ceramic fiber paper surface contact melt
There is high-temperature resistant coating, high-temperature resistant coating is from boron nitride coating, carbonization boron dope or molybdenum bisuphide coating.
The medial surface of above-mentioned inner thermal insulating layer extends inner sleeve 5 ~ 10mm of inner wall surface, and bottom surface and the inner sleeve of inner thermal insulating layer
Intermediate zone is provided between inwall, intermediate zone is by fatty glyceride and Pulvis Talci by weight 1:（1~5）It is mixed；Intermediate zone
Top surface it is bonding with the bottom surface of inner thermal insulating layer, the straight sided of intermediate zone is bonding with the inwall of inner sleeve, the prism of intermediate zone with it is interior
The angle of set inwall is 30 ~ 60.
The material of above-mentioned external thermal insulation is rubber or plastics.
It is that employing and binding agent carry out bonding that above-mentioned heat-insulation layer is bonding with inner sleeve, and described binding agent is to adopt hydroxyl
Sodium cellulosate, starch and water are mixed, and wherein hydroxyl sodium cellulosate accounts for the 15 ~ 25% of gross weight, starch account for weight 15 ~
25%。
The method of the present invention is comprised the following steps：
1st, using the Semi-continuous casting crystallizer for suppressing magnesium alloy ingot blank cracking, semi-continuous casting is carried out to magnesium alloy, it is first
First dummy ingot is risen to and formed in crystallizer semi-enclosed die cavity, using asbestos cord by the gap between dummy ingot and crystallizer inner sleeve
It is populated；
2nd, cooling water is opened, after water to be cooled fills cooling water tank, alternating current is passed through in magnet exciting coil；
3rd, the smelting magnesium alloy fused mass for finishing is drained in crystallizer by guiding device and splitter box, by encouraging
The Lorentz force that magnetic coil is produced is stirred to magnesium alloy fused mass, and now the inner wall lower of dummy ingot and inner sleeve is to magnesium alloy fused mass
Cooling；The wherein operating frequency of magnet exciting coil is 10 ~ 50Hz, the current intensity of the alternating current being passed through to magnet exciting coil is 100 ~
300A；
4th, open after magnesium alloy fused mass forms stable solidified shell with the part that metal inner sleeve and dummy ingot are contacted and cast
The ingot blank for having solidified is pulled out crystallizer by machine, and the speed that dummy ingot declines is 25 ~ 200mm/min；Simultaneously by cooling water tank to ingot
Base surface is passed through cooling water, and control cooling water line density is in 0.5 ~ 5L/s m.
In said method, after casting terminates, the ingot blank of final set is drawn by the alternating current being initially switched off in magnet exciting coil
Go out crystallizer and close cooling water, finally taking-up ingot blank is ready for semi-continuous casting next time.
The device of the present invention is additionally arranged heat-insulation layer in crystallizer inner metal sleeve, is in crystallizer internal upper part metal bath
Under the insulation effect of heat-insulation layer, the Lorentz force agitation melt that magnet exciting coil is produced after being powered in metal bath cuts level
On face, the temperature difference of liquid phase region and two-phase section reduces；After melt contacts lower metal matter inner sleeve, form more gentle solidifying
Gu shell, the stress produced in reducing process of setting；Simultaneously during downward out by the heat-insulation layer heat-insulation layer of metal bath, on surface
Surface of ingot blank quality is improve under power effect；Can effectively prevent from easily splitting alloy ingot blank and big standard round billet slab cracking, improve
Surface quality.
Metal inner sleeve thermal conductivity is big, and with strong cooling effect, and the heat-insulation layer of embedded inner sleeve inwall or outer wall can
To reduce the radiating efficiency of melt radial direction, strengthen its mobility, a weak cool condition formed here；Increase in the scope and protect
During warm layer height, the exposed height of metal inner sleeve declines, and the intensity of cooling of a cold zone melt declines；Conversely, intensity of cooling liter
It is high.By the height for adjusting heat-insulation layer, the power of a cool condition can be effectively controlled, so it is special according to the solidification of different-alloy
The surface quality and internal soundness for putting to improve ingot blank.
In whole casting process, melt is flowed into the method for the present invention by crystallizer top, is in same water with heat-insulation layer
The melt of flat height radiates in the presence of heat-insulation layer relatively slowly, and preferably, the stirring action of Lorentz force substantially, makes this portion to mobility
Divide melt temperature more uniform；Melt is moved downward when touching the inwall of metal inner sleeve, surface circumferential lengths increase, in table
In the presence of the tension force of face, fold and oxide skin are stretched, and surface quality improves, while temperature drop, forms solidified shell, solidification
Shell continues to pull downward on the ingot blank for having solidified, and thickness is thickening and is contacted cold again with cooling water by gradually pull-out crystallizer
But；This process is constantly carried out, and constitutes stable dynamic process.
During semi-continuous casting, the melt of crystallizer internal upper part is contacted with heat-insulation layer, in lower part melt and metal system
Set contact.By the insulation effect of heat-insulation layer, reduce the rate of cooling of crystallizer internal upper part melt, make the temperature of top melt compared with
Height, mobility strengthen, and are easy to efficiently give play to the stirring action of electromagnetic field, i.e., by the flowing of melt under a weak cold strength
Strengthen transmission speed of the ingot blank center portion heat to edge, so make in casting process melt in horizontal cross-section temperature difference more
It is little；After melt moves down out heat-insulation layer, during by sloped transition band, diameter of section gradually increases, and circumferential lengths increase, will
The oxidation film stretching of surface of ingot blank, can eliminate the fold on oxide-film, can improve surface quality；When melt is through crossing under band contact
During portion's metal inner sleeve, rate of cooling is accelerated, and edge melt temperature is reduced rapidly, forms solidified shell.Due to now horizontal cross-section
Upper temperature difference is less, and when constant temperature is reduced, the melt on same level section enters two-phase section the time for solidifying
Subtractive is little；Therefore, liquid point depth shoals, and solidified shell shape is gentler, significantly reduces ingot blank ingot blank during cooled and solidified
Internal unbalanced stress；Can effectively prevent ingot blank from ftractureing by the apparatus and method, improve ingot blank quality and lumber recovery and table
Face quality.
The method and apparatus of present invention design rationally, can be effectively reduced and easily split alloy ingot blank and big specification slab and circle
Crackle tendency of the base during semi-continuous casting, it is practical, it is easy to use, it is easy to grasp, effectively raise and produced
Yield rate in journey.
Description of the drawings
Fig. 1 is the Semi-continuous casting crystallizer cross-sectional view for suppressing magnesium alloy ingot blank cracking of the present invention；In figure,
1st, inner sleeve, 2, heat-insulation layer（Inner thermal insulating layer and external thermal insulation）, 3, transition region, 4, cooling water, 5, magnet exciting coil, 6, outside crystallizer
Shell, 7, water inlet, 8, apopore, 9, liquid phase region, 10, mushy zone, 11, solid phase area；
The two-phase section change of shape curve chart that Fig. 2 is surveyed when being traditional approach semi-continuous casting；
The two-phase section change of shape curve chart that Fig. 3 is surveyed when being the semi-continuous casting of the present invention；
Fig. 4 carries out the ingot blank center portion metallograph after MB26 magnesium alloy semi-continuous castings for traditional approach；
Fig. 5 is the ingot blank center portion metallograph after the MB26 magnesium alloy semi-continuous castings of the present invention；
Edge macroscopic view when Fig. 6 carries out the big specification slab semi-continuous casting of 300mm × 800mm magnesium alloys for traditional approach is shone
Piece figure；
Edge photomacrograph when Fig. 7 is the big specification slab semi-continuous casting of 300mm × 800mm magnesium alloys of the present invention
Figure；
Surface picture figures of the Fig. 8 for traditional approach semi-continuous casting Mg-9Gd-3Y-1.5Zn-0.6Zr alloy cast ingots；
Fig. 9 is the surface picture figure of the semi-continuous casting Mg-9Gd-3Y-1.5Zn-0.6Zr alloy cast ingots of the present invention；
Figure 10 is under conditions of the ZK60 alloys insulation layer height of the present invention is crystallizer height 70%, after semi-continuous casting
Surface of ingot blank photo figure；
Figure 11 is under conditions of the ZK60 alloys insulation layer height of the present invention is crystallizer height 50%, after semi-continuous casting
Surface of ingot blank photo figure.
Specific embodiment
The present invention coats the method for high-temperature resistant coating on inner thermal insulating layer：By boron nitride coating, carbonization boron dope or two
Molybdenum sulfide coating uniformly brushes inner thermal insulating layer surface, then dries 1h under the conditions of 150 DEG C.
The magnet exciting coil of the present invention has electromagnetic wire to be entwined, and is placed in inside cooling water tank, is fixed on by supporting construction
In the middle of cooling water, Lorentz force is produced in melt after being passed through alternating current, coordinate heat-insulation layer, the metal bath of good fluidity is filled
Divide agitation, make the top Temperature Field in Melt in crystallizer more uniform, reduce cross-section radial temperature difference.
Crystallizer shell and the inner sleeve of the present invention constitutes the cooling water tank of whole equipment, while and inner sleeve and coil consolidate
Determine device.Cooling water enters cooling water tank by water inlet, and for ingot blank is cold and the cooling of magnet exciting coil, and passes through water outlet
Crystallizer is flowed out in hole, and the cooling water directly contact surface of ingot blank of outflow becomes the source of ingot blank secondary cooling water.
The present invention magnet exciting coil be located at cooling water tank in, magnet exciting coil upper surface at the top of cooling water tank it is vertical away from
From≤50mm, the horizontal range≤30mm between magnet exciting coil and outer wall of inside race.
Boron nitride coating, carbonization boron dope and molybdenum bisuphide coating in the embodiment of the present invention is commercial products.
Ceramic fiber paper in the embodiment of the present invention is commercial products.
Fatty glyceride and Pulvis Talci in the embodiment of the present invention is commercial products.
It is that employing and binding agent carry out bonding that heat-insulation layer in the embodiment of the present invention is bonding with inner sleeve, and described binding agent is
It is mixed using hydroxyl sodium cellulosate, starch and water, wherein hydroxyl sodium cellulosate accounts for the 15 ~ 25% of gross weight, and starch is accounted for
The 15 ~ 25% of weight.
In the embodiment of the present invention, the material of external thermal insulation is rubber or plastics.
In the embodiment of the present invention, metallographic structure observation is carried out in Leica DMR metallurgical microscopes.
Embodiment 1
Suppress the Semi-continuous casting crystallizer structure of magnesium alloy ingot blank cracking as shown in figure 1, including inner sleeve, heat-insulation layer, cold
But water tank, magnet exciting coil and crystallizer shell, heat-insulation layer are arranged on the top of inner and outer wall simultaneously；It is arranged on the top of outer wall
Heat-insulation layer be external thermal insulation, its top is connected with the top board undersurface of inner sleeve, and the height of external thermal insulation is the 50% of inner sleeve height；
It is inner thermal insulating layer to be arranged on the heat-insulation layer above inwall, and with inner sleeve top surface with height, the height of inner thermal insulating layer is that inner sleeve is high on its top
The 50% of degree；The embedded inner sleeve of inner thermal insulating layer is simultaneously bonded on inwall, insert depth for sidewall of the inside race thickness 20%；External thermal insulation is embedding
Enter inner sleeve and be bonded on outer wall of inside race, insert depth for sidewall of the inside race thickness 20%；
The material of inner sleeve is aluminium alloy；
The material of inner thermal insulating layer is ceramic fiber paper, and the side of ceramic fiber paper surface contact melt is coated with boron nitride
Coating；
The medial surface of inner thermal insulating layer extends inner sleeve inner wall surface 5mm, and inner thermal insulating layer bottom surface and inner sleeve inwall between
Intermediate zone is provided with, intermediate zone is by fatty glyceride and Pulvis Talci by weight 1:1 is mixed；The top surface of intermediate zone and interior guarantor
The bottom surface bonding of warm layer, the straight sided of intermediate zone are bonding with the inwall of inner sleeve, the prism of intermediate zone and the angle of inner sleeve inwall
30；
Using above-mentioned mould casting MB26 magnesium alloy, method is carried out according to the following steps：
Dummy ingot is risen to and formed in crystallizer semi-enclosed die cavity, using asbestos cord by between dummy ingot and crystallizer inner sleeve
Gap filling it is good；
Cooling water is opened, after water to be cooled fills cooling water tank, alternating current is passed through in magnet exciting coil；
The smelting magnesium alloy fused mass for finishing is drained in crystallizer by guiding device and splitter box, by excitation
The Lorentz force that coil is produced is stirred to magnesium alloy fused mass, and now the inner wall lower of dummy ingot and inner sleeve is cold to magnesium alloy fused mass
But；Wherein the operating frequency of magnet exciting coil is 10Hz, and the current intensity of the alternating current being passed through to magnet exciting coil is 100A；
Casting machine is opened after magnesium alloy fused mass forms stable solidified shell with the part that metal inner sleeve and dummy ingot are contacted,
The ingot blank for having solidified is pulled out into crystallizer, the speed that dummy ingot declines is 60mm/min；Simultaneously by cooling water tank to surface of ingot blank
Cooling water is passed through, control cooling water line density is in 0.5L/s m；
After casting terminates, the ingot blank of final set is pulled out crystallizer simultaneously by the alternating current being initially switched off in magnet exciting coil
Cooling water is closed, finally taking-up ingot blank is ready for semi-continuous casting next time；
The ingot blank center portion metallograph of acquisition is as shown in Figure 5；
Identical strand, ingot blank center portion metallograph such as Fig. 4 of acquisition are in a manner described cast without heat-insulation layer using traditional
It is shown.
Embodiment 2
Suppress the Semi-continuous casting crystallizer structure of magnesium alloy ingot blank cracking with embodiment 1, difference is：
（1）Heat-insulation layer is arranged on the top of outer wall, is external thermal insulation；The height of external thermal insulation for inner sleeve height 80%；Outward
Heat-insulation layer insert depth for sidewall of the inside race thickness 40%；
（2）The material of inner sleeve is rustless steel；
（3）The material of inner thermal insulating layer is ceramic fiber paper, and the side of ceramic fiber paper surface contact melt is coated with carbon
Change boron dope；
（4）The medial surface of inner thermal insulating layer extends inner sleeve inner wall surface 8mm；Intermediate zone is by fatty glyceride and Pulvis Talci
By weight 1:2 are mixed；The prism of intermediate zone and the angle of inner sleeve inwall are 45；
Using the big specification slab of above-mentioned mould casting 300mm × 800mm magnesium alloys, the trade mark is AZ31, and method is with enforcement
Example 1, difference is：
（1）The operating frequency of magnet exciting coil is 20Hz, and the current intensity of the alternating current being passed through to magnet exciting coil is 300A；
（2）The speed that dummy ingot declines is 25mm/min；Control cooling water line density is in 5L/s m；
The slab edge photo of acquisition is as shown in Figure 7；
Identical strand is in a manner described cast without heat-insulation layer using traditional, the slab edge photo of acquisition is as shown in Figure 6.
Embodiment 3
Suppress the Semi-continuous casting crystallizer structure of magnesium alloy ingot blank cracking with embodiment 1, difference is：
（1）Heat-insulation layer is arranged on the top of the inwall of inner sleeve, is inner thermal insulating layer；The height of inner thermal insulating layer is inner sleeve height
80%；Inner thermal insulating layer insert depth for sidewall of the inside race thickness 40%；
（2）The material of inner sleeve is copper alloy；
（3）The material of inner thermal insulating layer is ceramic fiber paper, and the side of ceramic fiber paper surface contact melt is coated with two
Molybdenum sulfide coating；
（4）The medial surface of inner thermal insulating layer extends inner sleeve inner wall surface 10mm；Intermediate zone is by fatty glyceride and Talcum
Powder by weight 1:3 are mixed；The prism of intermediate zone and the angle of inner sleeve inwall are 45；
Using above-mentioned mould casting Mg-9Gd-3Y-1.5Zn-0.6Zr alloy cast ingot, method is with embodiment 1, difference
It is：
（1）The operating frequency of magnet exciting coil is 30Hz, and the current intensity of the alternating current being passed through to magnet exciting coil is 260A；
（2）The speed that dummy ingot declines is 100mm/min；Control cooling water line density is in 3L/s m；
The ingot casting surface picture of acquisition is as shown in Figure 9；
Identical strand is in a manner described cast without heat-insulation layer using traditional, the ingot casting surface picture of acquisition is as shown in Figure 8.
Embodiment 4
Suppress the Semi-continuous casting crystallizer structure of magnesium alloy ingot blank cracking with embodiment 1, difference is：
（1）Heat-insulation layer is arranged on the top of inner and outer wall simultaneously；The height of external thermal insulation for inner sleeve height 70%；It is interior
The height of heat-insulation layer for inner sleeve height 70%；Inner thermal insulating layer insert depth for sidewall of the inside race thickness 30%；External thermal insulation is embedded in
Depth for sidewall of the inside race thickness 30%；
（2）The material of inner sleeve is rustless steel；
（3）The material of inner thermal insulating layer is ceramic fiber paper, and the side of ceramic fiber paper surface contact melt is coated with two
Molybdenum sulfide coating；
（4）The medial surface of inner thermal insulating layer extends inner sleeve inner wall surface 6mm；Intermediate zone is by fatty glyceride and Pulvis Talci
By weight 1:5 are mixed；The prism of intermediate zone and the angle of inner sleeve inwall are 60；
ZK60 magnesium alloys are cast using said apparatus, method with embodiment 1, difference is：
（1）The operating frequency of magnet exciting coil is 50Hz, and the current intensity of the alternating current being passed through to magnet exciting coil is 150A；
（2）The speed that dummy ingot declines is 200mm/min；Control cooling water line density is in 2L/s m；
The surface of ingot blank photo of acquisition is as shown in Figure 10.
Embodiment 5
Suppress the Semi-continuous casting crystallizer structure of magnesium alloy ingot blank cracking with embodiment 4, difference is：
Interior external thermal insulation is highly crystallizer height 50%；
Method is with embodiment 4；
The surface of ingot blank photo of acquisition is as shown in figure 11.
Claims (5)
1. the Semi-continuous casting crystallizer that a kind of suppression magnesium alloy ingot blank ftractures, it is characterised in that including inner sleeve, heat-insulation layer, cooling
Water tank, magnet exciting coil and crystallizer shell, heat-insulation layer are arranged on the top of the inwall of inner sleeve, or are arranged on the top of outer wall, or
The top of inner and outer wall is arranged on simultaneously；The heat-insulation layer for being arranged on the top of outer wall is external thermal insulation, its top and inner sleeve
Top board undersurface connects, and the height of external thermal insulation is the 50 ~ 80% of inner sleeve height；It is inside holding to be arranged on the heat-insulation layer above inwall
Layer, with inner sleeve top surface with height, the height of inner thermal insulating layer is the 50 ~ 80% of inner sleeve height on its top；The embedded inner sleeve of inner thermal insulating layer is simultaneously glued
It is connected on inwall, insert depth for sidewall of the inside race thickness 20 ~ 40%；The embedded inner sleeve of external thermal insulation is simultaneously bonded on outer wall of inside race,
Insert depth for sidewall of the inside race thickness 20 ~ 40%；The medial surface of described inner thermal insulating layer extend inner sleeve inner wall surface 5 ~
10mm, and inner thermal insulating layer bottom surface and inner sleeve inwall between be provided with intermediate zone, intermediate zone is pressed by fatty glyceride and Pulvis Talci
Weight compares 1:（1~5）It is mixed；The top surface of intermediate zone is bonding with the bottom surface of inner thermal insulating layer, straight sided and the inner sleeve of intermediate zone
Inwall bonding, the prism of intermediate zone and the angle of inner sleeve inwall are 30 ~ 60.
2. the Semi-continuous casting crystallizer that suppression magnesium alloy ingot blank according to claim 1 ftractures, it is characterised in that described
Inner thermal insulating layer material selection ceramic fiber paper, and ceramic fiber paper surface contact melt side be coated with high temperature resistant painting
Material, high-temperature resistant coating is from boron nitride coating, carbonization boron dope or molybdenum bisuphide coating.
3. the Semi-continuous casting crystallizer that suppression magnesium alloy ingot blank according to claim 1 ftractures, it is characterised in that described
The material of external thermal insulation be rubber or plastics.
4. the Semi-continuous casting crystallizer that suppression magnesium alloy ingot blank according to claim 1 ftractures, it is characterised in that described
Heat-insulation layer it is bonding with inner sleeve be using and binding agent carry out bonding, described binding agent is using hydroxyl sodium cellulosate, shallow lake
Powder and water are mixed, and wherein hydroxyl sodium cellulosate accounts for the 15 ~ 25% of gross weight, and starch accounts for the 15 ~ 25% of weight.
5. the using method of the Semi-continuous casting crystallizer for suppressing magnesium alloy ingot blank cracking described in claim 1, its feature exists
In comprising the following steps：
（1）First dummy ingot is risen to and formed in crystallizer semi-enclosed die cavity, using asbestos cord by dummy ingot and crystallizer inner sleeve
Between gap filling it is good；
（2）Cooling water is opened, after water to be cooled fills cooling water tank, alternating current is passed through in magnet exciting coil；
（3）The smelting magnesium alloy fused mass for finishing is drained in crystallizer by guiding device and splitter box, by excitation
The Lorentz force that coil is produced is stirred to magnesium alloy fused mass, and now the inner wall lower of dummy ingot and inner sleeve is cold to magnesium alloy fused mass
But；The wherein operating frequency of magnet exciting coil is 10 ~ 50Hz, the current intensity of the alternating current being passed through to magnet exciting coil is 100 ~
300A；
（4）Casting machine is opened after magnesium alloy fused mass forms stable solidified shell with the part that metal inner sleeve and dummy ingot are contacted,
The ingot blank for having solidified is pulled out into crystallizer, the speed that dummy ingot declines is 25 ~ 200mm/min；Simultaneously by cooling water tank to ingot blank
Surface is passed through cooling water, and control cooling water line density is in 0.5 ~ 5L/s m.
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| CN105364036A (en) * | 2015-12-15 | 2016-03-02 | 德阳九鼎智远知识产权运营有限公司 | Crystallizing wheel |
| CN107116190B (en) * | 2017-03-23 | 2019-04-19 | 中南大学 | The big ingot blank electromagnetism semicontinuous casting technique of AQ80M magnesium alloy |
| CN107520416A (en) * | 2017-07-28 | 2017-12-29 | 上海应用技术大学 | The apparatus and method for preparing large scale alloy continuous casting |
| CN108246991B (en) * | 2018-01-26 | 2022-03-18 | 龙岩学院 | Semi-continuous casting device and method for inhibiting cracking of magnesium alloy ingot blank |
| CN108405821B (en) * | 2018-04-03 | 2019-09-03 | 东北大学 | The casting device and method of the big specification magnesium alloy slab ingot of flawless |
| CN109047691B (en) * | 2018-08-21 | 2020-08-18 | 苏州铭恒金属科技有限公司 | Mold treatment process for aluminum alloy hot top casting |
| CN111036869A (en) * | 2019-12-30 | 2020-04-21 | 西南铝业（集团）有限责任公司 | Casting process and casting system |
| CN114406214A (en) * | 2022-01-18 | 2022-04-29 | 江西理工大学 | Sectional type horizontal continuous casting crystallizer |
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