CN107470574A - The high speed semi-continuous casting device and method of a kind of aluminium alloy cast ingot - Google Patents
The high speed semi-continuous casting device and method of a kind of aluminium alloy cast ingot Download PDFInfo
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- CN107470574A CN107470574A CN201710696157.6A CN201710696157A CN107470574A CN 107470574 A CN107470574 A CN 107470574A CN 201710696157 A CN201710696157 A CN 201710696157A CN 107470574 A CN107470574 A CN 107470574A
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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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
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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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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Abstract
A kind of high speed semi-continuous casting device of aluminium alloy cast ingot, belong to aluminium alloy casting technology field, device includes hot top, crystallizer inner sleeve, crystallizer overcoat, cooling water cavity and dummy bar head, it is provided with secondary cooling water obstructing instrument below crystallizer inner sleeve, the petroleum pipeline entrance below crystallizer overcoat is provided with grease quantitative valve；Method is：(1) pour into a mould aluminium alloy melt and carry out semi-continuous casting, convey lubricating oil；(2) it is 200~400mm/min to control semi-continuous casting speed, sprays secondary cooling water to ingot casting surface；The conveying capacity of lubricating oil rises with casting speed；(3) ingot surface temperature is detected；(4) secondary cooling water obstructing instrument is controlled according to ingot surface temperature；(5) operation of repeat step (4) is until complete to cast.The device and method of the present invention makes being substantially increased for casting speed, improves ingot surface quality, ingot casting is uniform without casting flaw, microstructure.
Description
Technical field
The invention belongs to aluminium alloy casting technology field, the high speed semi-continuous casting dress of more particularly to a kind of aluminium alloy cast ingot
Put and method.
Background technology
Traditional semi-continuous casting device, because cooldown rate is relatively low, lubrication of crystallizer is poor, and casting speed is by very big
Limitation, has had a strong impact on the production efficiency of aluminium alloy cast ingot, and structure property and surface quality are all undesirable.
Under existing casting technique, the common crystallizer type of cooling is mostly the angle and size of single hydrophthalmia and hydrophthalmia
Selection be difficult to make current cooling effectiveness to maximize, have lost the cooling effect of a part of secondary cooling water；Melted under the conditions of high-speed casting
Frictional force after body solidification with crystallizer inner sleeve increases, and bleedout and drawing crack easily occurs using common Casting Equipment；And common
Casting Equipment is difficult to reach the effect further cooled down by force after ingot solidification, may make ingot casting under the conditions of high-speed casting
Generation backheat, for needing the aluminium alloy cast ingot of strong cooling very unfavorable, so conventional cast mode and equipment are difficult to height
Speed and the casting process cooled down by force.
For aluminium alloy, under ordinary casting condition, because casting speed is slower, cooldown rate is low, aluminium alloy casting
Ingot coarse grains, segregation is serious, and non-equilibrium phase is thick, and mechanical property is relatively low, and the casting flaws such as pile displacement easily occurs in ingot casting surface,
The structure property of ingot casting is had a strong impact on.The lifting of casting speed brings the increase of cooldown rate, can obvious refining aluminum alloy
Crystal grain, strengthen the flowing of semi-continuous casting process melt, improve the surface quality of ingot casting；Therefore by improving conventional cast side
Method, increase the lubrication of ingot casting inner surface, improve casting speed, be the effective ways for improving ingot casting performance.
The content of the invention
Second-rate in ordinary casting condition lower surface in order to solve existing aluminium alloy, segregation is serious, coarse grains, alloy
The relatively low problem of performance, the present invention provide a kind of the high speed semi-continuous casting device and method of aluminium alloy cast ingot, by improving tradition
Casting method, increase the lubrication of ingot casting inner surface, increase substantially semi-continuous casting speed, and new secondary cooling water baffling device
The effectively cooling of enhancing ingot casting, eliminates surface defect, mitigates gross segregation, while reaches crystal grain thinning, improves ingot structure
The effect of energy.
The high speed semi-continuous casting device of the aluminium alloy cast ingot of the present invention include hot top, crystallizer inner sleeve, crystallizer overcoat,
It is provided with secondary cooling water obstructing instrument below cooling water cavity and dummy bar head, wherein crystallizer inner sleeve, the petroleum pipeline below crystallizer overcoat enters
Mouthful place is provided with grease quantitative valve for controlling lubricating oil conveying capacity, multiple petroleum pipeline exit passageways on the inwall of crystallizer inner sleeve
Circumferentially it is uniformly distributed in same level, porous graphite is filled with inside petroleum pipeline exit passageway；Described secondary cooling water resistance
It is made up of every device metal part and rubber ring, metal part is made up of circular plate and ring baffle, and wherein ring baffle is by justifying
The outer of ring flat board stretches out on the side, is fixed together on the inside of rubber ring and circular plate, rubber ring internal diameter and ingot casting
Diameter is engaged；Whole secondary cooling water obstructing instrument is made up of the shape identical obstructing instrument halfbody of left and right two, each obstructing instrument halfbody
It is fixed together with a piston rod, supporting piston cylinder is assemblied in one by cable and a drive device with piston rod
Rise；Temperature detector is provided with below secondary cooling water obstructing instrument, for detecting the temperature on ingot casting surface, its test point obstructs with secondary cooling water
The difference in height of the rubber ring top surface of device is 30~50mm.
In said apparatus, temperature detector is fixed together with a piston rod, the supporting piston with the piston rod
Cylinder is assembled together by cable and drive device.
In said apparatus, connected below crystallizer inner sleeve provided with two row's secondary cooling water eyes with cooling water cavity, wherein upper row two is cold
The angle theta of hydrophthalmia and horizontal plane1For 30 °~45 °, the angle theta of lower row's secondary cooling water eye and horizontal plane2For 50 °~75 °；Secondary cooling water eye
Internal diameter be 1~3mm.
In said apparatus, the internal diameter of petroleum pipeline is 1~2mm, and petroleum pipeline is extended in crystallizer from crystallizer jacket internal
Set is internal；Each corresponding petroleum pipeline of petroleum pipeline exit passageway, each petroleum pipeline entrance set a grease quantitative valve；Often
Individual petroleum pipeline exit passageway for height 0.5~1mm, 2~4mm of depth, 1~5mm of width cube cavity.
The measurement range of above-mentioned hygrosensor is 10~600 DEG C.
In said apparatus, the top surface of the circular plate of secondary cooling water obstructing instrument and the vertical drop of the bottom surface of crystallizer inner sleeve
For 100~200mm.
Above-mentioned ring baffle and the angle theta of horizontal plane3For 30 °~60 °.
The high speed semi-continuous casting method of the aluminium alloy cast ingot of the present invention is to use said apparatus, is comprised the following steps：
1st, aluminium alloy melt is noted to hot top casting, proceeds by semi-continuous casting, while deliver lubricating oil in crystallizer
The inwall of set, crystallizer inwall is lubricated, reduces the frictional force of ingot solidification shell and internal surface of crystallizer；Determined by grease
It is 10~30ml/min that amount valve, which controls the conveying capacity of lubricating oil,；
2nd, it is 200~400mm/min to control semi-continuous casting speed, passes through two row's secondary cooling water eyes during semi-continuous casting
Secondary cooling water is sprayed to ingot casting surface；When semi-continuous casting speed is more than 200mm/min, the conveying capacity of lubricating oil is adjusted, makes it
With the proportional rising of casting speed, rising scale often improves 100mm/min by every casting speed, and lubricating oil conveying capacity rises 25~
30ml/min, lubricating oil passes under pressure through porous graphite uniformly penetrating to internal surface of crystallizer during semi-continuous casting；
3rd, when extrusion ingot length reaches 300~400mm, by the piston rod that is connected with temperature detector by temperature detector
Close to ingot casting, ingot surface temperature is detected；
4th, when ingot surface temperature is more than 0.8T1When, by with the piston rod that obstructing instrument halfbody is connected by two obstructing instruments
Halfbody is clamped on ingot casting, forms secondary cooling water obstructing instrument, makes along the secondary cooling water that ingot casting surface flows down the shape at secondary cooling water obstructing instrument
Strengthen cooling down into pond；Then when ingot surface temperature is less than 0.5T1When, by with the piston rod that obstructing instrument halfbody is connected by two
Individual obstructing instrument halfbody is removed from ingot casting surface, secondary cooling water is flowed down along ingot casting surface；Described T1For the non-equilibrium solid of aluminium alloy
Liquidus temperature；
5th, the operation of repeat step 4 is until complete to cast.
In the above method, when carrying out semi-continuous casting, the pouring temperature of aluminium alloy is higher than the liquidus curve 30~100 of aluminium alloy
℃。
In the above method, the external diameter for the aluminium alloy pole ingot casting for completing to obtain after casting is 30~200mm.
The present invention principle be：By secondary cooling water partition apparatus, it can quickly block secondary cooling water formation one cold
But pond is strengthened and ingot casting is cooled down, and is detected by hygrosensor when ingot casting reaches predetermined temperature and stopped obstructing, and makes two
Cold water flows down；Secondary cooling water obstructing instrument surround with ingot casting appearance and size same apparatus, guarantee with ingot casting be in close contact, it is water-tight；
Improved by secondary cooling water eye and two rows hydrophthalmia is set in crystallizer inner sleeve, by controlling the angle and size of secondary cooling water eye, increased
Add secondary cooling water cooling effectiveness.
It is an advantage of the invention that：First, casting speed is substantially increased the productivity ratio for effectively increasing casting process；2nd, lead to
The lubrication problem that supply of the porous graphite to lubricating oil solves high speed DC casting process crystallizers well is crossed, is significantly lifted
Ingot surface quality simultaneously ensure that being smoothed out for high speed DC casting process；3rd, the angle to crystallizer secondary cooling water eye is passed through
With the control of diameter, secondary cooling water is set to obtain optimal cooling effect；4th, by increasing secondary cooling water baffling device below crystallizer,
Further cooling of the increase to ingot casting；5th, for the ingot casting under high speed DC castings without casting flaw, microstructure is uniform, does not occur partially
Layer is analysed, crystal grain is substantially refined, mechanical property lifting.
Brief description of the drawings
Fig. 1 is the high speed semi-continuous casting device cross-sectional view of the aluminium alloy cast ingot in the embodiment of the present invention 1；
Fig. 2 is Fig. 1 secondary cooling water obstructing instrument part partial enlarged drawing；
Fig. 3 is Fig. 2 A-A to profile；
Fig. 4 is Fig. 3 hydrophthalmia part-structure profiles；
Fig. 5 is the secondary cooling water canthus degree structural representation in Fig. 1；
Fig. 6 is the secondary cooling water obstructing instrument overlooking the structure diagram in Fig. 1；
Fig. 7 is the vertical sectional view of the obstructing instrument halfbody II of the secondary cooling water obstructing instrument in Fig. 6；
In figure：1st, melt, 2, Re Ding, 3, petroleum pipeline exit passageway (filling porous graphite), 4, crystallizer inner sleeve, 5, oil transportation
Pipe, 6, crystallizer overcoat, 7, cooling water cavity, 8, grease quantitative valve, 9, drive device I, 10, cable I, 11, cable III, 12, living
Plug cylinder I, 13, piston rod I, 14, piston cylinder III, 15, piston rod III, 16, connecting rod I, 17, secondary cooling water obstructing instrument, 17-1, annulus
Flat board, 17-2, ring baffle, 17-3, rubber ring, 18, temperature detector, 19, secondary cooling water eye, 19-1, upper row's secondary cooling water eye,
19-2, lower row's secondary cooling water eye, 20, ingot casting, 21, dummy bar head, 22, obstructing instrument halfbody I, 23, obstructing instrument halfbody II, 24, piston rod
II, 25 connecting rods III；
Fig. 8 is the cast ingot product outward appearance photo figure in the embodiment of the present invention；In figure：(a) embodiment 1, (b) embodiment 2,
(c) embodiment 3；
Fig. 9 is the cast ingot product metallographic structure photo figure in the embodiment of the present invention：In figure：(a) embodiment 1, (b) embodiment
2, (c) embodiment 3.
Embodiment
The material selection stainless steel of the metal part of secondary cooling water obstructing instrument in the embodiment of the present invention.
The rubber ring of secondary cooling water obstructing instrument in the embodiment of the present invention is not less than 500 DEG C of rubber from heat resisting temperature.
The aluminium alloy selected in the embodiment of the present invention is A390 aluminium alloys, Al-23%Si aluminium alloys or Al-18%Mg2Si
Aluminium alloy, it is 505 DEG C, 574 DEG C and 584 DEG C that its non-equilibrium solidus temperature, which is respectively,.
The porous graphite used in the embodiment of the present invention is commercial products.
Grease quantitative valve is used in the embodiment of the present invention as commercial products.
The quantity that petroleum pipeline exports in the embodiment of the present invention is 8.
The quantity of secondary cooling water eye is 70~90 in the embodiment of the present invention.
The equipment that observation metallographic structure uses in the embodiment of the present invention is LeicaDMR metallographic microscope.
The temperature detector used in the embodiment of the present invention is K-type thermocouple contact temperature detector purchased in market, measurement essence
Degree is not less than 0.5 DEG C.
The flow of secondary cooling water is 100~250L/min in the embodiment of the present invention.
A diameter of 30~200mm of aluminium alloy cast ingot in the embodiment of the present invention.
Each piston cylinder in example of the embodiment of the present invention is fixed on crystallizer jacket bottom by connecting rod.
Drive device is fixed on crystallizer jacket bottom in the embodiment of the present invention.
The difference in height h of ring baffle and circular plate in the embodiment of the present invention1For 30~100mm.
The width h of circular plate in the embodiment of the present invention2For 10~30mm.
The width h of rubber ring in the embodiment of the present invention3For 10~20mm.
Together with rubber ring is adhesively fixed with circular plate formula in the embodiment of the present invention.
The degasifier used in the embodiment of the present invention is carbon trichloride and aluminum oxide in mass ratio 3:1 is mixed, dosage
Account for aluminium alloy melt gross mass by degasifier 0.5% adds.
Embodiment 1
The high speed semi-continuous casting device structure of aluminium alloy cast ingot as shown in figure 1, partial enlargement structure as shown in Fig. 2 A-A
To structure as shown in figure 3, including heat top 2, crystallizer inner sleeve 4, crystallizer overcoat 6, cooling water cavity 7 and dummy bar head 21, wherein tying
The brilliant lower section of device inner sleeve 4 is provided with secondary cooling water obstructing instrument 17, and the petroleum pipeline entrance of the lower section of crystallizer overcoat 6 is provided with grease quantitative valve 8
For controlling lubricating oil conveying capacity, 8 edges in same level of petroleum pipeline exit passageway 3 on the inwall of crystallizer inner sleeve 4
Even circumferential is distributed, and petroleum pipeline exports 3 channel interiors and is filled with porous graphite；
The structure of secondary cooling water obstructing instrument 17 as shown in Figures 6 and 7, is made up of metal part and rubber ring 17-3, metal part by
Circular plate 17-1 and ring baffle 17-2 is formed, and wherein ring baffle 17-2 is outwards prolonged on the side by the outer of circular plate 17-1
Stretch, be fixed together on the inside of rubber ring 17-3 and circular plate 17-1, the diameter of rubber ring 17-3 internal diameters and ingot casting 20 matches
Close；Whole secondary cooling water obstructing instrument 17 is by the shape identical obstructing instrument halfbody of left and right two：Obstructing instrument halfbody I 22 and obstructing instrument halfbody
II 23 composition obstructing instrument halfbodies I 22 are fixed together with piston rod I 13, and the piston cylinder I 12 supporting with piston rod I 13 passes through
Cable is assembled together with drive device I 9；Obstructing instrument halfbody II 23 is fixed together with piston rod II 24, with piston rod
II 24 supporting piston cylinders II are assembled together by cable and drive device II；
The lower section of secondary cooling water obstructing instrument 17 is provided with temperature detector 18, for detecting the temperature on ingot casting surface, its test point and
The difference in height of the rubber ring top surface of secondary cooling water obstructing instrument 17 is 30mm；
Temperature detector 18 is fixed together with piston rod III 15, and the piston cylinder III 14 supporting with piston rod III 15 is logical
Cable is crossed to be assembled together with drive device I 9；
Wherein piston cylinder I 13 is fixed on the bottom of crystallizer overcoat 6 by connecting rod I 16, and piston cylinder II passes through connecting rod II
The bottom of crystallizer overcoat 6 is fixed on, piston cylinder III 14 is fixed on the bottom of crystallizer overcoat 6 by connecting rod III 25；
The lower section of crystallizer inner sleeve 4 connects provided with two row's secondary cooling water eyes 19 with cooling water cavity 7, wherein upper row's secondary cooling water eye 19-1
With the angle theta of horizontal plane1For 30 °, lower row secondary cooling water eye 19-2 and horizontal plane angle theta2For 50 °；The internal diameter of each secondary cooling water eye 19
For 1mm；
The internal diameter of petroleum pipeline 5 is 1mm, and petroleum pipeline 5 is extended to inside crystallizer overcoat 6 inside crystallizer inner sleeve 4；Each
Petroleum pipeline exports the corresponding petroleum pipeline 5 of 3 passages, and each entrance of petroleum pipeline 5 sets a grease quantitative valve 8；Each oil transportation
Pipe exit passageway 3 is height 0.5mm, depth 2mm, width 1mm cube cavity；
The measurement range of hygrosensor is 10~600 DEG C；
The circular plate 17-1 of secondary cooling water obstructing instrument 17 top surface and the vertical drop of the bottom surface of crystallizer inner sleeve 4 are
100mm；
Ring baffle 17-2 and horizontal plane angle theta3For 60 °；
Casting method is to use said apparatus, is comprised the following steps：
The aluminium alloy used is A390 aluminium alloy；Its non-equilibrium solidus temperature (T1) with 505 DEG C of calculating；
Prepare raw material according to element mass percent, metallic aluminium and alusil alloy are placed in crucible electrical resistance furnace, 800~
850 DEG C of meltings；After being completely melt, Ni metal and Mg ingot meltings are added, and be incubated 1h；Degasifier is added at 730~750 DEG C to remove
Gas refines 10min, removes scum silica frost, stands 20min at 800~820 DEG C, obtains aluminium alloy melt；
Aluminium alloy melt is noted to hot top casting, proceeds by semi-continuous casting, pouring temperature is higher than aluminum alloy melt liquidus temperature
100 DEG C, while the inwall of crystallizer inner sleeve is delivered lubricating oil to, crystallizer inwall is lubricated, reduces ingot solidification shell
With the frictional force of internal surface of crystallizer；It is 10ml/min to control the conveying capacity of lubricating oil by grease quantitative valve；
It is 300mm/min to control semi-continuous casting speed, by two row's secondary cooling water eyes to ingot casting during semi-continuous casting
Spray secondary cooling water in surface；Lubricating oil conveying capacity rises 25ml/min, i.e. 35ml/min, lubricating oil is being pressed during semi-continuous casting
Pass through porous graphite uniformly penetrating to internal surface of crystallizer under power；
When extrusion ingot length reaches 300mm, by the piston rod that is connected with temperature detector by temperature detector close to casting
Ingot, detect ingot surface temperature；
When ingot surface temperature is more than 0.8T1When, by with the piston rod that obstructing instrument halfbody is connected by two obstructing instruments half
Body is clamped on ingot casting, is formed secondary cooling water obstructing instrument, is made to be formed at secondary cooling water obstructing instrument along the secondary cooling water that ingot casting surface flows down
Strengthen cooling in pond；Then when ingot surface temperature is less than 0.5T1When, by with the piston rod that obstructing instrument halfbody is connected by two
Obstructing instrument halfbody is removed from ingot casting surface, secondary cooling water is flowed down along ingot casting surface；
The operation of previous step is repeated until completing to cast；
, can by figure shown in metallographic structure observed result such as Fig. 9 (a) shown in aluminium alloy cast ingot outward appearance such as Fig. 8 (a) of acquisition
See that ingot surface quality is good, no casting flaw, primary silicon is evenly distributed.
Embodiment 2
With embodiment 1, difference is apparatus structure：
(1) temperature detecting point and the difference in height of the rubber ring top surface of secondary cooling water obstructing instrument are 40mm；
(2)θ1For 40 °, θ2For 60 °；The internal diameter of each secondary cooling water eye is 3mm；
(3) the internal diameter 1.5mm of petroleum pipeline, petroleum pipeline exit passageway height 0.8mm, depth 3mm, width 3mm；
(4) top surface of the circular plate of secondary cooling water obstructing instrument and the vertical drop of the bottom surface of crystallizer inner sleeve are 150mm；
(5)θ3For 45 °；
With embodiment 1, difference is casting method：
(1) aluminium alloy used is Al-23%Si aluminium alloy；Its non-equilibrium solidus temperature (T1) with 574 DEG C of calculating；
(2) prepare raw material according to element mass percent metallic aluminium and alusil alloy are placed in crucible electrical resistance furnace, 750~
780 DEG C of meltings, 1h is incubated, degasifier refinery by de-gassing 10min is added at 750~760 DEG C, remove scum silica frost, it is quiet at 760~770 DEG C
15min is put, obtains aluminium alloy melt；
(3) it is 20ml/min to control the conveying capacity of lubricating oil by grease quantitative valve；
(4) pouring temperature is higher than 60 DEG C of liquidus curve, semi-continuous casting speed 400mm/min；The conveying capacity of lubricating oil rises 2
× 30=60ml/min, i.e. 80ml/min；
(5) when extrusion ingot length reaches 350mm, ingot surface temperature is detected；
(6) shown in the aluminium alloy cast ingot outward appearance such as Fig. 8 (b) obtained, shown in metallographic structure observed result such as Fig. 9 (b), by scheming
It can be seen that ingot surface quality is good, no casting flaw, primary silicon is evenly distributed.
Embodiment 3
With embodiment 1, difference is apparatus structure：
(1) temperature detecting point and the difference in height of the rubber ring top surface of secondary cooling water obstructing instrument are 50mm；
(2)θ1For 45 °, θ2For 75 °；The internal diameter of each secondary cooling water eye is 2mm；
(3) the internal diameter 2mm of petroleum pipeline, petroleum pipeline exit passageway height 1mm, depth 4mm, width 5mm；
(4) top surface of the circular plate of secondary cooling water obstructing instrument and the vertical drop of the bottom surface of crystallizer inner sleeve are 200mm；
(5)θ3For 30 °；
With embodiment 1, difference is casting method：
(1) aluminium alloy used is Al-18%Mg2Si aluminium alloys；Its non-equilibrium solidus temperature (T1) with 584 DEG C of calculating；
(2) prepare raw material according to element mass percent, metallic aluminium and other alloying component raw materials are placed in crucible resistance
In stove, in 750~770 DEG C of meltings, 1h is incubated, degasifier refinery by de-gassing 10min is added at 740~760 DEG C, removes scum silica frost,
730~740 DEG C of standing 15min, obtain aluminium alloy melt；
(3) it is 30ml/min to control the conveying capacity of lubricating oil by grease quantitative valve；
(4) pouring temperature is higher than 30 DEG C of liquidus curve, semi-continuous casting speed 200mm/min；The conveying capacity of lubricating oil is kept
It is constant；
(5) when extrusion ingot length reaches 400mm, ingot surface temperature is detected；
(6) shown in the aluminium alloy cast ingot outward appearance such as Fig. 8 (c) obtained, shown in metallographic structure observed result such as Fig. 9 (c), by scheming
It can be seen that ingot surface quality is good, no casting flaw, come into being Mg2Si is evenly distributed, and is closed with casting aluminium of the same race using conventional method
Metallographic ratio, at high-speed casting (400mm/min), tensile strength is lifted to 261MPa the above method by 195MPa, elongation percentage by
1.3% is promoted to 4.6%.
Claims (9)
1. the high speed semi-continuous casting device of a kind of aluminium alloy cast ingot, it is characterised in that including hot top, crystallizer inner sleeve, crystallizer
It is provided with secondary cooling water obstructing instrument below overcoat, cooling water cavity and dummy bar head, wherein crystallizer inner sleeve, the oil transportation below crystallizer overcoat
Pipe entrance is provided with grease quantitative valve and is used to control lubricating oil conveying capacity, multiple petroleum pipelines outlet on the inwall of crystallizer inner sleeve
Passage is circumferentially uniformly distributed in same level, and porous graphite is filled with inside petroleum pipeline exit passageway；Described two are cold
Water obstructing instrument is made up of metal part and rubber ring, and metal part is made up of circular plate and ring baffle, wherein ring baffle
Outer by circular plate stretches out on the side, is fixed together on the inside of rubber ring and circular plate, rubber ring internal diameter and casting
The diameter of ingot is engaged；Whole secondary cooling water obstructing instrument is made up of the shape identical obstructing instrument halfbody of left and right two, each obstructing instrument
Halfbody is fixed together with a piston rod, and supporting piston cylinder is assembled by cable and a drive device with piston rod
Together；Temperature detector, for detecting the temperature on ingot casting surface, its test point and secondary cooling water are provided with below secondary cooling water obstructing instrument
The difference in height of the rubber ring top surface of obstructing instrument is 30~50mm.
2. the high speed semi-continuous casting device of a kind of aluminium alloy cast ingot according to claim 1, it is characterised in that described
Temperature detector is fixed together with a piston rod, and supporting piston cylinder passes through cable and drive device with the piston rod
It is assembled together.
3. the high speed semi-continuous casting device of a kind of aluminium alloy cast ingot according to claim 1, it is characterised in that described
Connected below crystallizer inner sleeve provided with two row's secondary cooling water eyes with cooling water cavity, wherein the angle theta of upper row's secondary cooling water eye and horizontal plane1
For 30 °~45 °, the angle theta of lower row's secondary cooling water eye and horizontal plane2For 50 °~75 °；The internal diameter of secondary cooling water eye is 1~3mm.
4. the high speed semi-continuous casting device of a kind of aluminium alloy cast ingot according to claim 1, it is characterised in that described
The internal diameter of petroleum pipeline is 1~2mm, and petroleum pipeline is extended to inside crystallizer inner sleeve from crystallizer jacket internal；Each petroleum pipeline goes out
The corresponding petroleum pipeline of mouth passage, each petroleum pipeline entrance set a grease quantitative valve；Each petroleum pipeline exit passageway is
Highly 0.5~1mm, 2~4mm of depth, 1~5mm of width cube cavity.
5. the high speed semi-continuous casting device of a kind of aluminium alloy cast ingot according to claim 1, it is characterised in that described
The top surface of the circular plate of secondary cooling water obstructing instrument and the vertical drop of the bottom surface of crystallizer inner sleeve are 100~200mm.
6. the high speed semi-continuous casting device of a kind of aluminium alloy cast ingot according to claim 1, it is characterised in that described
The angle theta of ring baffle and horizontal plane3For 30 °~60 °.
7. the high speed semi-continuous casting method of a kind of aluminium alloy cast ingot, it is characterised in that using the device described in claim 1, press
Following steps are carried out：
(1) aluminium alloy melt is noted to hot top casting, proceeds by semi-continuous casting, while deliver lubricating oil to crystallizer inner sleeve
Inwall, crystallizer inwall is lubricated, reduces the frictional force of ingot solidification shell and internal surface of crystallizer；Pass through grease quantitative valve
The conveying capacity for controlling lubricating oil is 10~30ml/min；
(2) it is 200~400mm/min to control semi-continuous casting speed, during semi-continuous casting by two row's secondary cooling water eyes to
Spray secondary cooling water in ingot casting surface；When semi-continuous casting speed is more than 200mm/min, adjust the conveying capacity of lubricating oil, make its with
The proportional rising of casting speed, rising scale often improve 100mm/min by every casting speed, and lubricating oil conveying capacity rises 25~
30ml/min, lubricating oil passes under pressure through porous graphite uniformly penetrating to internal surface of crystallizer during semi-continuous casting；
(3) when extrusion ingot length reaches 300~400mm, temperature detector is leaned on by the piston rod being connected with temperature detector
Nearly ingot casting, detect ingot surface temperature；
(4) when ingot surface temperature is more than 0.8T1When, by with the piston rod that obstructing instrument halfbody is connected by two obstructing instrument halfbodies
It is clamped on ingot casting, forms secondary cooling water obstructing instrument, make to form water at secondary cooling water obstructing instrument along the secondary cooling water that ingot casting surface flows down
Strengthen cooling in pond；Then when ingot surface temperature is less than 0.5T1When, by the way that two are hindered with the piston rod that obstructing instrument halfbody is connected
Removed every device halfbody from ingot casting surface, secondary cooling water is flowed down along ingot casting surface；Described T1For the non-equilibrium solidus of aluminium alloy
Temperature；
(5) operation of repeat step (4) is until complete to cast.
8. the high speed semi-continuous casting method of a kind of aluminium alloy cast ingot according to claim 7, it is characterised in that carry out half
During continuously casting, the pouring temperature of aluminium alloy is higher than 30~100 DEG C of the liquidus curve of aluminium alloy.
9. the high speed semi-continuous casting method of a kind of aluminium alloy cast ingot according to claim 7, it is characterised in that complete casting
The external diameter of the aluminium alloy pole ingot casting obtained when making is 30~200mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710696157.6A CN107470574B (en) | 2017-08-15 | 2017-08-15 | A kind of the high speed semi-continuous casting device and method of aluminium alloy cast ingot |
Applications Claiming Priority (1)
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| CN108436048A (en) * | 2018-03-27 | 2018-08-24 | 银邦金属复合材料股份有限公司 | A kind of aluminum alloy semi-continuous casting wiper and the method for scraping water blocking |
| CN109290533A (en) * | 2018-11-13 | 2019-02-01 | 广东省材料与加工研究所 | A kind of method of identical-level hot-top casting device and casting aluminium and aluminum alloy round ingot |
| CN112605354A (en) * | 2020-11-26 | 2021-04-06 | 湖南文昌新材科技股份有限公司 | Three-section cooling crystallizer for continuous casting |
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