CN107470574B - A kind of the high speed semi-continuous casting device and method of aluminium alloy cast ingot - Google Patents
A kind of the high speed semi-continuous casting device and method of aluminium alloy cast ingot Download PDFInfo
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- CN107470574B CN107470574B CN201710696157.6A CN201710696157A CN107470574B CN 107470574 B CN107470574 B CN 107470574B CN 201710696157 A CN201710696157 A CN 201710696157A CN 107470574 B CN107470574 B CN 107470574B
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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 housing, cooling water cavity and dummy bar head, secondary cooling water obstructing instrument is equipped with below crystallizer inner sleeve, the petroleum pipeline entrance below crystallizer housing is equipped with grease quantitative valve；Method are as follows: (1) be poured aluminium alloy melt and carry out semi-continuous casting, convey lubricating oil；(2) control semi-continuous casting speed is 200~400mm/min, 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 step (4) is repeated until completing casting.The device of the invention and method make being substantially increased for casting speed, improve ingot surface quality, and for ingot casting without casting flaw, microstructure is uniform.
Description
Technical field
The invention belongs to aluminium alloy casting technology field, in particular to the high speed semi-continuous casting of a kind of aluminium alloy cast ingot fills
It sets and method.
Background technique
Traditional semi-continuous casting device, since cooling rate is lower, lubrication of crystallizer is poor, and casting speed is by very big
Limitation, has seriously affected 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 water flow cooling efficiency to maximize, have lost the cooling effect of a part of secondary cooling water；It is melted under the conditions of high-speed casting
Increase after body solidification with the frictional force of crystallizer inner sleeve, bleedout and drawing crack easily occurs using common Casting Equipment；And common
Casting Equipment is difficult to achieve the effect that further to cool down by force after ingot solidification, may make ingot casting under the conditions of high-speed casting
Backheat occurs, it is very unfavorable for the aluminium alloy cast ingot for needing to cool down by force, so conventional cast mode and equipment are difficult to realize height
Fast and cooling by force casting process.
For aluminium alloy, under ordinary casting condition, since casting speed is slower, cooling rate is low, aluminium alloy casting
Ingot coarse grains, segregation is serious, and non-equilibrium phase is coarse, and mechanical property is lower, and the casting flaws such as pile displacement easily occurs in ingot casting surface,
The structure property of ingot casting is seriously affected.The increase of the brought cooling rate of promotion of rate is cast, it can obvious refining aluminum alloy
Crystal grain, enhance semi-continuous casting process melt flowing, improve the surface quality of ingot casting；Therefore by improving conventional cast side
Method increases the lubrication of ingot casting inner surface, improves casting speed, is the effective ways for improving ingot casting performance.
Summary 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 lower problem of performance, the present invention provide the high speed semi-continuous casting device and method of a kind of aluminium alloy cast ingot, by improving tradition
Casting method increases the lubrication of ingot casting inner surface, increases substantially semi-continuous casting speed and novel secondary cooling water baffling device
The effectively cooling of enhancing ingot casting, eliminates surface defect, mitigates gross segregation, while reaching refinement crystal grain, improves ingot structure
The effect of energy.
The high speed semi-continuous casting device of aluminium alloy cast ingot of the invention include hot top, crystallizer inner sleeve, crystallizer housing,
Cooling water cavity and dummy bar head are wherein equipped with secondary cooling water obstructing instrument below crystallizer inner sleeve, the petroleum pipeline below crystallizer housing into
It is equipped with grease quantitative valve at mouthful to be used to control lubricating oil conveying capacity, multiple petroleum pipeline exit passageways on the inner wall of crystallizer inner sleeve
It is circumferentially uniformly distributed in same level, porous graphite is filled with inside petroleum pipeline exit passageway；The secondary cooling water resistance
It is made of every device metal part and rubber ring, metal part is made of circular plate and ring baffle, and wherein ring baffle is by justifying
The outside of ring plate extends outwardly upwards, is fixed together on the inside of rubber ring and circular plate, rubber ring internal diameter and ingot casting
Diameter matches；Entire secondary cooling water obstructing instrument is made of the identical obstructing instrument halfbody of two shapes in left and right, each obstructing instrument halfbody
It is fixed together with a piston rod, piston cylinder matched with piston rod is assemblied in one by cable and a driving device
It rises；Temperature detector is equipped with below secondary cooling water obstructing instrument, for detecting the temperature of ingot casting surface, test point and secondary cooling water are obstructed
The difference in height of the rubber ring top surface of device is 30~50mm.
In above-mentioned apparatus, temperature detector is fixed together with a piston rod, piston matched with the piston rod
Cylinder is assembled together by cable and driving device.
It is equipped with two rows of secondary cooling water eyes in above-mentioned apparatus, below crystallizer inner sleeve to be connected to cooling water cavity, wherein upper row two is cold
The angle theta of hydrophthalmia and horizontal plane1It is 30 °~45 °, the angle theta of lower row's secondary cooling water eye and horizontal plane2It is 50 °~75 °；Secondary cooling water eye
Internal diameter be 1~3mm.
In above-mentioned apparatus, the internal diameter of petroleum pipeline is 1~2mm, and petroleum pipeline extends in crystallizer from crystallizer jacket internal
Set is internal；A grease quantitative valve is arranged in the corresponding petroleum pipeline of each petroleum pipeline exit passageway, each petroleum pipeline entrance；Often
A petroleum pipeline exit passageway is 0.5~1mm of height, the cube cavity of 2~4mm of depth, 1~5mm of width.
The measurement range of above-mentioned hygrosensor is 10~600 DEG C.
In above-mentioned apparatus, the vertical drop of the bottom surface of the top surface and crystallizer inner sleeve of the circular plate of secondary cooling water obstructing instrument
For 100~200mm.
The angle theta of above-mentioned ring baffle and horizontal plane3It is 30 °~60 °.
The high speed semi-continuous casting method of aluminium alloy cast ingot of the invention is using above-mentioned apparatus, comprising the following steps:
1, aluminium alloy melt is infused to hot top casting, starts to carry out semi-continuous casting, while delivering lubricating oil in crystallizer
The inner wall of set is lubricated crystallizer inner wall, reduces the frictional force of ingot solidification shell and internal surface of crystallizer；It is fixed by grease
The conveying capacity for measuring valve control lubricating oil is 10~30ml/min；
2, control semi-continuous casting speed is 200~400mm/min, passes through two rows of 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, it is made
With the proportional rising of casting speed, rising scale press the every raising 100mm/min of every casting speed, lubricating oil conveying capacity rise 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, by the piston rod that is connect with temperature detector by temperature detector
Close to ingot casting, ingot surface temperature is detected；
4, when ingot surface temperature is greater than 0.8T1When, by the piston rod that is connect with obstructing instrument halfbody by two obstructing instruments
Halfbody is clamped on ingot casting, constitutes secondary cooling water obstructing instrument, makes the secondary cooling water flowed down along ingot casting surface shape at secondary cooling water obstructing instrument
Reinforce cooling down at pond；Then when ingot surface temperature is less than 0.5T1When, by the piston rod that is connect with obstructing instrument halfbody by two
A obstructing instrument halfbody is removed from ingot casting surface, flows down secondary cooling water along ingot casting surface；The T1For the non-equilibrium solid of aluminium alloy
Liquidus temperature；
5, the operation of step 4 is repeated until completing casting.
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 outer diameter for completing the aluminium alloy pole ingot casting obtained after casting is 30~200mm.
The principle of the present invention is: by secondary cooling water partition apparatus, can quickly block secondary cooling water formation one cold
But pond is strengthened and is cooled down to ingot casting, and is detected when ingot casting reaches predetermined temperature by hygrosensor and stop obstructing, and makes two
Cold water flows down；Secondary cooling water obstructing instrument surround with ingot casting outer dimension same apparatus, guarantee with ingot casting be in close contact, it is water-tight；
It is 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 efficiency.
The invention has the advantages that one, casting speed is substantially increased the productivity for effectively increasing casting process；Two, lead to
Porous graphite is crossed to the supply very good solution of the lubricating oil lubrication problem of high speed DC casting process crystallizer, is significantly promoted
Ingot surface quality simultaneously ensure that going on smoothly for high speed DC casting process；Three, pass through the angle to crystallizer secondary cooling water eye
With the control of diameter, secondary cooling water is made to obtain best cooling effect；Four, by increasing secondary cooling water baffling device below crystallizer,
Further increase the cooling to ingot casting；Five, for the ingot casting under high speed DC casting without casting flaw, microstructure is uniform, does not occur partially
Layer is analysed, crystal grain is obviously refined, and mechanical property is promoted.
Detailed description of the invention
Fig. 1 is the high speed semi-continuous casting device the schematic diagram of the section structure of the aluminium alloy cast ingot in the embodiment of the present invention 1；
Fig. 2 is the secondary cooling water obstructing instrument part partial enlarged view of Fig. 1；
Fig. 3 is the A-A of Fig. 2 to sectional view；
Fig. 4 is Fig. 3 hydrophthalmia part-structure sectional view；
Fig. 5 is the secondary cooling water canthus degree structural schematic diagram in Fig. 1；
Fig. 6 is the secondary cooling water obstructing instrument overlooking 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: 1, melt, 2, Re Ding, 3, petroleum pipeline exit passageway (filling porous graphite), 4, crystallizer inner sleeve, 5, oil transportation
Pipe, 6, crystallizer housing, 7, cooling water cavity, 8, grease quantitative valve, 9, driving device I, 10, cable I, 11, cable III, 12, work
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
Plate, 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 appearance photo figure in the embodiment of the present invention；In figure: embodiment 1 (a), embodiment 2 (b),
(c) embodiment 3；
Fig. 9 is the cast ingot product metallographic structure photo figure in the embodiment of the present invention: in figure: embodiment 1 (a), (b) embodiment
2, embodiment 3 (c).
Specific 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 that the rubber ring of secondary cooling water obstructing instrument in the embodiment of the present invention selects heat resisting temperature to be not less than 500 DEG C.
The aluminium alloy selected in the embodiment of the present invention is A390 aluminium alloy, Al-23%Si aluminium alloy or Al-18%Mg2Si
Aluminium alloy, non-equilibrium solidus temperature are 505 DEG C, 574 DEG C and 584 DEG C.
The porous graphite used in the embodiment of the present invention is commercial products.
Use grease quantitative valve for commercial products in the embodiment of the present invention.
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 commercially available K-type thermocouple contact temperature detector, 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.
The diameter of aluminium alloy cast ingot is 30~200mm in the embodiment of the present invention.
Each piston cylinder in example of the embodiment of the present invention is fixed by the connecting rod in crystallizer jacket bottom.
Driving 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 mixed for carbon trichloride and aluminium oxide 3:1 in mass ratio, dosage
Account for aluminium alloy melt gross mass by degasifier 0.5% is added.
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 housing 6, cooling water cavity 7 and dummy bar head 21, wherein tying
Secondary cooling water obstructing instrument 17 is equipped with below brilliant device inner sleeve 4, the petroleum pipeline entrance of 6 lower section of crystallizer housing is equipped with grease quantitative valve 8
8 edges in same level of petroleum pipeline exit passageway 3 for controlling lubricating oil conveying capacity, on the inner wall of crystallizer inner sleeve 4
Even circumferential distribution, petroleum pipeline export 3 channel interiors and are filled with porous graphite；
17 structure of secondary cooling water obstructing instrument is as shown in Figures 6 and 7, is made of metal part and rubber ring 17-3, metal part by
Circular plate 17-1 and ring baffle 17-2 is constituted, and wherein ring baffle 17-2 is from the outside of circular plate 17-1 upwards to extension
It stretches, is fixed together on the inside of rubber ring 17-3 and circular plate 17-1, the diameter of rubber ring 17-3 internal diameter and ingot casting 20 matches
It closes；Entire secondary cooling water obstructing instrument 17 is by the identical obstructing instrument halfbody of two shapes in left and right: 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 piston cylinder I 12 matched with piston rod I 13 passes through
Cable is assembled together with driving device I 9；Obstructing instrument halfbody II 23 is fixed together with piston rod II 24, with piston rod
II 24 matched piston cylinders II are assembled together by cable with driving device II；
Temperature detector 18 is equipped with below secondary cooling water obstructing instrument 17, for detecting the temperature of ingot casting surface, test point with
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 piston cylinder III 14 matched with piston rod III 15 is logical
Cable is crossed to be assembled together with driving device I 9；
Wherein piston cylinder I 13 is fixed on 6 bottom of crystallizer housing by connecting rod I 16, and piston cylinder II passes through connecting rod II
It is fixed on 6 bottom of crystallizer housing, piston cylinder III 14 is fixed on 6 bottom of crystallizer housing by connecting rod III 25；
It is equipped with two rows of secondary cooling water eyes 19 below crystallizer inner sleeve 4 to be connected to cooling water cavity 7, wherein upper arrange secondary cooling water eye 19-1
With the angle theta of horizontal plane1It is 30 °, the angle theta of lower row secondary cooling water eye 19-2 and horizontal plane2It is 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 inside crystallizer housing 6 internal stretch to crystallizer inner sleeve 4；Each
Petroleum pipeline exports the corresponding petroleum pipeline 5 in 3 channels, and a grease quantitative valve 8 is arranged in each 5 entrance of petroleum pipeline；Each oil transportation
Pipe exit passageway 3 is height 0.5mm, the cube cavity of depth 2mm, width 1mm；
The measurement range of hygrosensor is 10~600 DEG C；
The vertical drop of the top surface and the bottom surface of crystallizer inner sleeve 4 of the circular plate 17-1 of secondary cooling water obstructing instrument 17 is
100mm；
The angle theta of ring baffle 17-2 and horizontal plane3It is 60 °；
Casting method is using above-mentioned apparatus, comprising the following steps:
The aluminium alloy used is A390 aluminium alloy；Its non-equilibrium solidus temperature (T1) calculated with 505 DEG C；
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 melting is added, and keep the temperature 1h；Degasifier is added at 730~750 DEG C to remove
Gas refines 10min, removes dross, in 800~820 DEG C of standing 20min, obtains aluminium alloy melt；
Aluminium alloy melt is infused to hot top casting, starts to carry out semi-continuous casting, pouring temperature is higher than aluminum alloy melt liquidus temperature
100 DEG C, while the inner wall of crystallizer inner sleeve is delivered lubricating oil to, crystallizer inner wall is lubricated, ingot solidification shell is reduced
With the frictional force of internal surface of crystallizer；It is 10ml/min by the conveying capacity that grease quantitative valve controls lubricating oil；
Control semi-continuous casting speed is 300mm/min, passes through two rows of 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 connect with temperature detector by temperature detector close to casting
Ingot detects ingot surface temperature；
When ingot surface temperature is greater than 0.8T1When, by the piston rod that is connect with obstructing instrument halfbody by two obstructing instruments half
Body is clamped on ingot casting, constitutes secondary cooling water obstructing instrument, forms the secondary cooling water flowed down along ingot casting surface at secondary cooling water obstructing instrument
Reinforce cooling in pond；Then when ingot surface temperature is less than 0.5T1When, by the piston rod that is connect with obstructing instrument halfbody by two
Obstructing instrument halfbody is removed from ingot casting surface, flows down secondary cooling water along ingot casting surface；
The operation of previous step is repeated until completing casting；
Shown in aluminium alloy cast ingot appearance such as Fig. 8 (a) of acquisition, shown in metallographic structure observed result such as Fig. 9 (a), You Tuke
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) difference in height of the rubber ring top surface of temperature detecting point and secondary cooling water obstructing instrument is 40mm；
(2)θ1It is 40 °, θ2It is 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) vertical drop of the top surface of the circular plate of secondary cooling water obstructing instrument and the bottom surface of crystallizer inner sleeve is 150mm；
(5)θ3It is 45 °；
With embodiment 1, difference is casting method:
(1) aluminium alloy used is Al-23%Si aluminium alloy；Its non-equilibrium solidus temperature (T1) calculated with 574 DEG C；
(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 keep the temperature 1h, in 750~760 DEG C of addition degasifier refinery by de-gassing 10min, remove dross, quiet at 760~770 DEG C
15min is set, aluminium alloy melt is obtained；
It (3) is 20ml/min by the conveying capacity that grease quantitative valve controls lubricating oil；
(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 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) difference in height of the rubber ring top surface of temperature detecting point and secondary cooling water obstructing instrument is 50mm；
(2)θ1It is 45 °, θ2It is 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) vertical drop of the top surface of the circular plate of secondary cooling water obstructing instrument and the bottom surface of crystallizer inner sleeve is 200mm；
(5)θ3It is 30 °；
With embodiment 1, difference is casting method:
(1) aluminium alloy used is Al-18%Mg2Si aluminium alloy；Its non-equilibrium solidus temperature (T1) calculated with 584 DEG C；
(2) prepare raw material according to element mass percent, metallic aluminium and other alloying component raw materials are placed in crucible resistance
In furnace, in 750~770 DEG C of meltings, 1h is kept the temperature, in 740~760 DEG C of addition degasifier refinery by de-gassing 10min, removes dross,
730~740 DEG C of standing 15min obtain aluminium alloy melt；
It (3) is 30ml/min by the conveying capacity that grease quantitative valve controls lubricating oil；
(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 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 closes with aluminium of the same race is cast using conventional method
Metallographic ratio, at high-speed casting (400mm/min), tensile strength is promoted by 195MPa to 261MPa the above method, elongation percentage by
1.3% is promoted to 4.6%.
Claims (8)
1. a kind of high speed semi-continuous casting device of aluminium alloy cast ingot, it is characterised in that including heat top, crystallizer inner sleeve, crystallizer
Housing, cooling water cavity and dummy bar head are wherein equipped with secondary cooling water obstructing instrument, the oil transportation below crystallizer housing below crystallizer inner sleeve
Multiple petroleum pipelines outlet that pipe entrance is equipped with grease quantitative valve for controlling lubricating oil conveying capacity, on the inner wall of crystallizer inner sleeve
Channel 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 of metal part and rubber ring, and metal part is made of circular plate and ring baffle, wherein ring baffle
Extended outwardly upwards by the outside of circular plate, is fixed together on the inside of rubber ring and circular plate, rubber ring internal diameter and casting
The diameter of ingot matches；Entire secondary cooling water obstructing instrument is made of the identical obstructing instrument halfbody of two shapes in left and right, each obstructing instrument
Halfbody is fixed together with a piston rod, and piston cylinder matched with piston rod is assembled by cable and a driving device
Together；Temperature detector is equipped with below secondary cooling water obstructing instrument, for detecting the temperature of ingot casting surface, test point and secondary cooling water
The difference in height of the rubber ring top surface of obstructing instrument is 30 ~ 50mm；The top surface of the circular plate of the secondary cooling water obstructing instrument and crystallization
The vertical drop of the bottom surface of device inner sleeve is 100 ~ 200mm.
2. a kind of high speed semi-continuous casting device 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 piston cylinder matched with the piston rod passes through cable and driving device
It is assembled together.
3. a kind of high speed semi-continuous casting device of aluminium alloy cast ingot according to claim 1, it is characterised in that described
It is equipped with two rows of secondary cooling water eyes below crystallizer inner sleeve to be connected to cooling water cavity, wherein the angle theta of upper row secondary cooling water eye and horizontal plane1
For 30o ~ 45o, the angle theta of lower row's secondary cooling water eye and horizontal plane2For 50o ~ 75o；The internal diameter of secondary cooling water eye is 1 ~ 3mm.
4. a kind of high speed semi-continuous casting device 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 extends to inside crystallizer inner sleeve from crystallizer jacket internal；Each petroleum pipeline outlet
Channel corresponds to a petroleum pipeline, and a grease quantitative valve is arranged in each petroleum pipeline entrance；Each petroleum pipeline exit passageway is height
Spend 0.5 ~ 1mm, the cube cavity of 2 ~ 4mm of depth, 1 ~ 5mm of width.
5. a kind of high speed semi-continuous casting device of aluminium alloy cast ingot according to claim 1, it is characterised in that described
The angle theta of ring baffle and horizontal plane3For 30o ~ 60o.
6. a kind of high speed semi-continuous casting method of aluminium alloy cast ingot, it is characterised in that using the device described in claim 1,
It sequentially includes the following steps:
(1) aluminium alloy melt is infused to hot top casting, starts to carry out semi-continuous casting, while delivering lubricating oil to crystallizer inner sleeve
Inner wall is lubricated crystallizer inner wall, 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) control semi-continuous casting speed is 200 ~ 400mm/min, by two rows of secondary cooling water eyes to casting during semi-continuous casting
Ingot surface sprays secondary cooling water；When semi-continuous casting speed is more than 200 mm/min, the conveying capacity of lubricating oil is adjusted, makes it with casting
The proportional rising of speed is made, rising scale presses the every raising 100mm/min of 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) by the piston rod being connect with temperature detector that temperature detector is close when extrusion ingot length reaches 300 ~ 400mm
Ingot casting detects ingot surface temperature；
(4) when ingot surface temperature is greater than 0.8T1When, by the piston rod that is connect with obstructing instrument halfbody by two obstructing instrument halfbodies
It is clamped on ingot casting, constitutes secondary cooling water obstructing instrument, the secondary cooling water flowed down along ingot casting surface is made to form water at secondary cooling water obstructing instrument
Reinforce cooling in pond；Then when ingot surface temperature is less than 0.5 T1When, by the piston rod that is connect with obstructing instrument halfbody by two
Obstructing instrument halfbody is removed from ingot casting surface, flows down secondary cooling water along ingot casting surface；The T1For the non-equilibrium solid phase of aluminium alloy
Line temperature；
(5) operation of step (4) is repeated until completing casting.
7. a kind of high speed semi-continuous casting method of aluminium alloy cast ingot according to claim 6, it is characterised in that carry out half
When continuously casting, the pouring temperature of aluminium alloy is higher than 30 ~ 100 DEG C of liquidus curve of aluminium alloy.
8. a kind of high speed semi-continuous casting method of aluminium alloy cast ingot according to claim 6, it is characterised in that complete casting
The outer diameter of the aluminium alloy pole ingot casting obtained when making is 30 ~ 200mm.
Priority Applications (1)
| 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)
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107470574A CN107470574A (en) | 2017-12-15 |
| CN107470574B true CN107470574B (en) | 2019-04-23 |
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| CN108436048B (en) * | 2018-03-27 | 2021-01-08 | 银邦金属复合材料股份有限公司 | Wiper for aluminum alloy semi-continuous casting and water scraping and retaining method |
| 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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