CN110039015A - Car body aluminum alloy extrusion section bar ingot casting casting crystallizer and its casting method - Google Patents
Car body aluminum alloy extrusion section bar ingot casting casting crystallizer and its casting method Download PDFInfo
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- CN110039015A CN110039015A CN201910402089.7A CN201910402089A CN110039015A CN 110039015 A CN110039015 A CN 110039015A CN 201910402089 A CN201910402089 A CN 201910402089A CN 110039015 A CN110039015 A CN 110039015A
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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
Abstract
A kind of car body aluminum alloy extrusion section bar ingot casting casting crystallizer and its casting method, belong to metal smelt field.With in ingot casting casting crystallizer, crystallizer ontology is arranged on continuous casting line the car body aluminum alloy extrusion section bar, crystallizer ontology and cooling ring interference fit, and multiple cooling nozzles, cooling nozzle and cooling system closure connection are provided in cooling ring；Mirror symmetry distribution is presented using the casting entrance of crystallizer as symmetry axis in cooling nozzle, and to another side direction, the quantity of cooling nozzle successively reduces inlet side of casting.In casting process, using sub-sectional cooling technique, according to the water flow of the corresponding injection of temperature of aluminum liquid setting of different sizes i.e. around aluminium ingot, to keep ingot casting ambient temperature gradients balanced, homogeneous grain size reduces crackle tendency, and then reduce the performance difference of extrudate two sides, the performance uniformity of profile entirety is improved, reduces profile quenching distortion amount, extends the service life of profile.
Description
Technical field
The present invention relates to metal smelt technical field more particularly to aluminium alloy casting fields, and in particular to a kind of car body aluminium
Alloy extrudate ingot casting casting crystallizer and its casting method.
Background technique
Car body is now produced, large-size aluminum alloy " work " type extrudate multi-purpose greatly, the profile is after performance detection, discovery type
The mechanical property difference of material two sides is larger, causes profile to generate quenching distortion, and profile easily generates shape in use
Become, has seriously affected the service life of profile.Through analyzing, the reason for this is that particle size distribution unevenly causes on ingot casting cross section
, side crystal grain is slightly coarse compared with the other side, causes the mechanical property difference of extrudate two sides larger.Existing casting process
In, the size of surrounding's cooling water flow of ingot casting is identical, but due to making to cast liquid in crystallizer casting inlet temperature of aluminum liquid height
Casting inlet side is biased in cave, and the temperature of aluminum liquid for inlet side of casting in cooling procedure is higher than the other side, is caused same
The temperature gradient of ingot casting is different on cooling surface, and the crystal grain for inlet side of casting is larger than the other side.The crystal grain of ingot casting two sides is big
Small uneven, so that ingot casting is integrally uneven, and is also easy to produce stress concentration in casting process, crackle tendency is big.
In the prior art, in order to eliminate temperature gradient, so that the temperature field of whole system is kept constant, the method for use has
It is added and heating is set to control each section of intensity of cooling with the cold burden of cast aluminum identical component or the cooling water flow velocity of setting
The drawing speed or use electromagnetic field of system heating temperature and drawing billet mechanism reduce temperature gradient, promote melt in crystallizer
Flowing, reduces liquid point depth, these methods have the shortcomings that increase ancillary equipment or improve human cost.
Summary of the invention
In order to balanced car body aluminum alloy extrusion section bar ingot casting in casting process the crystallizer casting entrance side and other side
The temperature gradient of metal, the invention proposes car body aluminum alloy extrusion section bar ingot casting casting crystallizers and its casting method, should
Method is a kind of casting technique of car body aluminium alloy large scale circle ingot casting, which mainly uses sub-sectional cooling work
Skill, i.e., it is of different sizes according to temperature of aluminum liquid around aluminium ingot, and the water flow size sprayed is also different, to make ingot casting ambient temperature
Gradient is more balanced, and grain size is more uniform, reduces crackle tendency, and then subtracts the performance difference of extrudate two sides
It is small, the performance uniformity of profile entirety is improved, reduces profile quenching distortion amount, extends the service life of profile.
A kind of car body aluminum alloy extrusion section bar ingot casting casting crystallizer of the invention, including crystallizer ontology, cooling ring
And cooling system；
The crystallizer ontology is arranged on continuous casting line, crystallizer ontology and cooling ring interference fit, cooling ring
On be provided with multiple cooling nozzles, the water inlet of cooling nozzle is connected with the water outlet of cooling system, the water outlet of cooling nozzle
It is connected with the water inlet of cooling system；
Mirror symmetry distribution is presented using the casting entrance of crystallizer as symmetry axis in the cooling nozzle, entrance one of casting
Lateral another side direction, the quantity of cooling nozzle successively reduce.
Preferably, cooling nozzle with the 1/4 of crystallizer perimeter for a subregion, blueline is mutually perpendicular to, crystallizer
Casting center line of suction and blueline are in 45 ° of angles, wherein the casting center line of suction of crystallizer is the first subregion and third point
The line of symmetry in area；Cooling nozzle quantity 3~4 fewer than the cooling nozzle quantity that the first subregion is arranged of third subregion setting, the
Cooling nozzle quantity 1~2 fewer than the cooling nozzle quantity that the second subregion is arranged of three subregions setting, the 4th subregion is arranged cold
But mouth of a river quantity and the cooling nozzle of the second subregion setting are equal.
The car body aluminum alloy extrusion section bar crystallizer, temperature difference≤5 DEG C on the same cooling surface of ingot casting.
A kind of casting method of car body aluminum alloy extrusion section bar ingot casting, using above-mentioned crystallizer, comprising the following steps:
Step 1: melting heat preservation
According to the ingredient of car body aluminum alloy extrusion section bar, raw material is weighed, is placed in smelting furnace, is melted, skimmed, essence
Refining keeps the temperature 1h, the molten aluminium alloy after being kept the temperature；
Step 2: casting
Molten aluminium alloy after heat preservation is cast in crystallizer, synchronization is passed through cooling into the cooling nozzle of crystallizer
Water, cooling water make temperature difference≤5 DEG C of the ingot casting on same cooling surface, and cast temperature is 700~730 DEG C, and casting speed is
40~50mm/min obtains car body aluminum alloy extrusion section bar ingot casting.
Different according to the specification of ingot casting in the step 2, cooling water flow is different, specifically, when ingot casting is Ф 550
When~600mm, cooling water total flow is 8.5~9.0m3/ h is located at crystallization according to the cooling nozzle number of cooling nozzle subregion
In the subregion of the casting entrance of device, point water flow of cooling water than its opposite side subregion divide water flow >=0.08~
0.3m3/ h carries out transition direction, point of next subregion to the subregion of its opposite side from the subregion of the casting entrance of crystallizer
Water flow divides water flow≤0.03~0.2m relative to a upper subregion3/h。
Car body aluminum alloy extrusion section bar ingot casting casting crystallizer and its casting method of the invention, its advantages exist
In:
1, different by the temperature of molten aluminum around ingot casting, several cooling zones can be equally divided into, temperature of aluminum liquid difference is bigger, cold
But area's quantity will be arranged more.The temperature gradient of the control same cooling surface of ingot casting that in this way can be subtleer, guarantees identical
Grain size.
2, the quantity of cooling nozzle in each cooling zone being regulated and controled, the high region of temperature of aluminum liquid divides water flow bigger,
Otherwise it is smaller, the size of point water flow, the temperature of the balanced same cooling surface of ingot casting are adjusted by adjusting the quantity of cooling nozzle
Gradient.
3, by the temperature gradient of the same cooling surface of balanced ingot casting, the equal of crystal grain on the same section of aluminium alloy cast ingot is improved
Even property, and then the Squeezing ground of material is improved, the uniformity of the overall performance of ingot casting is improved, the crackle tendency of ingot casting can be reduced.
4, ingot structure is more uniform, and product moulding effect is more preferable in extrusion process, is not likely to produce metaboly.
5, poor by reducing the performance of profile two sides, the whole uniformity of extrudate performance is improved, quenching distortion is eliminated,
Improve the service life of profile.
6, simple using this method equipment, production cost can be saved.
Detailed description of the invention
Fig. 1 is the schematic diagram of the cooling car body aluminum alloy extrusion section bar ingot casting casting crystallizer of existing casting；
Fig. 2 is the schematic diagram of the cooling car body aluminum alloy extrusion section bar ingot casting casting crystallizer of present invention casting.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail.
Comparative example
A kind of car body 7N01 aluminum alloy extrusion section bar ingot casting, having a size of Ф 582mm, using is existing Ф 582mm
Casting crystallizer, schematic diagram are provided with 200 diameters as shown in Figure 1, being uniformly distributed in the cooling ring of ingot casting periphery as 3mm's
Cooling nozzle.
A kind of casting method of car body 7N01 aluminum alloy extrusion section bar ingot casting are as follows:
Step 1: melting heat preservation
According to the ingredient of car body aluminum alloy extrusion section bar, raw material is weighed, is placed in smelting furnace, carry out melting, heat preservation obtains
Molten aluminium alloy after heat preservation；
Step 2: casting
Molten aluminium alloy after heat preservation is cast in crystallizer, cast temperature is 730 DEG C, casting speed 45mm/
Min, total water current amount are 8.6m3/ h is 2.15m by point water flow size point in each area3/ h after casting, obtains vehicle
Body 7N01 aluminum alloy extrusion section bar ingot casting.Car body 7N01 aluminum alloy extrusion section bar obtained with ingot casting after low power detects,
Grain size close to casting inlet side is 2.5 grades, and the grain size of the opposite other side is 1.5 grades, and crystal grain, which is less than, to be molded into
Mouth side.After ingot casting is squeezed into " work " type extrudate, the tensile strength difference of profile two sides is 8Mpa, by 5 meters of long profiles
After quenching, laterally turning round and twisting deflection is 5mm.
Embodiment 1
A kind of car body 7N01 aluminum alloy extrusion section bar ingot casting, having a size of Ф 582mm, the car body of use is aluminium alloy extruded
Profile ingot casting casting crystallizer is as shown in Figure 2.
In the present embodiment, a kind of car body aluminum alloy extrusion section bar ingot casting casting crystallizer, including crystallizer ontology, cooling
Ring and cooling system；
The crystallizer ontology is arranged on continuous casting line, crystallizer ontology and cooling ring interference fit, cooling ring
On be provided with multiple cooling nozzles, the water inlet of cooling nozzle is connected with the water outlet of cooling system, the water outlet of cooling nozzle
It is connected with the water inlet of cooling system；
Cooling nozzle in cooling ring is divided into 4 regions, with the 1/4 of crystallizer perimeter for a subregion, blueline phase
Mutually vertical, the casting center line of suction and blueline of crystallizer are in 45 ° of angles, wherein the casting center line of suction of crystallizer is
The line of symmetry of first subregion and third subregion；Wherein, a quarter positioned at casting inlet side is 1st area, is distributed by clockwise,
Next a quarter is 2nd area, is 3rd area relative to casting entrance other side a quarter, is left as 4th area；The cooling in 1st area is set
Mouth of a river quantity is 51, the cooling nozzle that the cooling nozzle quantity in 2nd area is 50, the cooling nozzle quantity in 3rd area is 49,4th area
Quantity is 50, by adjust each area's cooling nozzle number, to adjust each size for distinguishing water flow.Pass through regulatory region
The quantity in domain, the equilibrium degree of Lai Tigao temperature gradient guarantee the uniformity of two sides grain size.
A kind of casting method of car body 7N01 aluminum alloy extrusion section bar ingot casting, using above-mentioned crystallizer, specific steps
Are as follows:
Step 1: melting heat preservation
According to the ingredient of car body aluminum alloy extrusion section bar, raw material is weighed, is placed in smelting furnace, carry out melting, heat preservation obtains
Molten aluminium alloy after heat preservation；
Step 2: casting
Molten aluminium alloy after heat preservation is cast in the crystallizer of the present embodiment, it is synchronous into the cooling nozzle of crystallizer
It is passed through cooling water, by the adjusting to area's cooling nozzle number each in crystallizer, to adjust each size for distinguishing water flow.
By the quantity of adjustment region, the equilibrium degree of Lai Tigao temperature gradient guarantees the uniformity of two sides grain size.
Wherein, cast temperature is 730 DEG C, casting speed 45mm/min, and total water current amount is 8.6m3/ h, dividing water flow is 1
Area 2.193m3/ h, 2 area 2.15m3/ h, 3 area 2.107m3/ h, 4 area 2.15m3/ h after casting, obtains car body 7N01 aluminium alloy
Extrudate ingot casting；
The car body 7N01 aluminum alloy extrusion section bar that the present embodiment is obtained with ingot casting after low power detects, close to being molded into
The grain size of mouth side is 2 grades, and the grain size of the other side relative to casting entrance is 1.5 grades, and the same outline of crystal grain, which is less than, to be poured
Cast inlet side.After ingot casting is squeezed into " work " type extrudate, using identical heat treating regime, the tensile strength of profile two sides
Difference is 4MPa, and after 5 meters long of profile quenching, laterally turning round and twisting deflection is 3mm.
Embodiment 2
A kind of car body 7N01 aluminum alloy extrusion section bar ingot casting, having a size of Ф 582mm, the car body of use is aluminium alloy extruded
Cooling nozzle in cooling ring is divided into 4 subregions by profile ingot casting casting crystallizer, with the 1/4 of crystallizer perimeter for one
Subregion, blueline are mutually perpendicular to, and the casting center line of suction and blueline of crystallizer are in 45 ° of angles, wherein the casting of crystallizer
Center line of suction is the line of symmetry of the first subregion and third subregion；Wherein, a quarter positioned at casting inlet side is 1st area,
By distribution clockwise, next a quarter is 2nd area, is 3rd area relative to casting entrance other side a quarter, is left as 4th area,
It is 52 that 1 area's cooling nozzle quantity is arranged simultaneously, and the cooling nozzle quantity in 2nd area is 50, the cooling nozzle quantity in 3rd area is 48
A, 4th area cooling nozzle quantity are 50.
A kind of casting method of car body 7N01 aluminum alloy extrusion section bar ingot casting, using above-mentioned crystallizer, specific steps
Are as follows:
Step 1: melting heat preservation
According to the ingredient of car body aluminum alloy extrusion section bar, raw material is weighed, is placed in smelting furnace, carry out melting, heat preservation obtains
Molten aluminium alloy after heat preservation；
Step 2: casting
Molten aluminium alloy after heat preservation is cast in the crystallizer of the present embodiment, it is synchronous into the cooling nozzle of crystallizer
It is passed through cooling water, by the adjusting to area's cooling nozzle number each in crystallizer, to adjust each size for distinguishing water flow.
By the quantity of adjustment region, the equilibrium degree of Lai Tigao temperature gradient guarantees the uniformity of two sides grain size.
Using 730 DEG C of casting temperature, casting speed 45mm/min, total water current amount is 8.6m3/ h, that is, point water flow used
Amount is 1 area 2.236m3/ h, 2 area 2.15m3/ h, 3 area 2.064m3/ h, 4 area 2.15m3/ h after casting, obtains car body 7N01
Aluminum alloy extrusion section bar ingot casting；
To the present embodiment car body 7N01 aluminum alloy extrusion section bar obtained with ingot casting after low power detects, close to casting
The grain size of inlet side is 2 grades, and the grain size of the other side is 2 grades, and two sides grain size is identical.Ingot casting is squeezed into " work " type
After extrudate, using identical heat treating regime, the tensile strength difference of profile two sides is 1MPa, after 5 meters long of profile quenching,
Laterally deformation is twisted without torsion.
Embodiment 3
A kind of car body 7N01 aluminum alloy extrusion section bar ingot casting, having a size of Ф 582mm, the car body of use is aluminium alloy extruded
Cooling nozzle in cooling ring is divided into 5 subregions by profile ingot casting casting crystallizer, and 5 subregions are poured entrance with crystallizer
Center line is symmetry axis, i.e., 1/5th comprising casting entrance are 1st area, presses distribution clockwise, is followed successively by 2nd area, 3rd area, 4th area, 5
Area, wherein the center line for entrance of casting is the symmetry division line in 1st area, meanwhile, 1 area's cooling nozzle quantity of setting is adjusted to 44,
Remaining area's quantity is 40,2nd area, 38,3rd area, 38,4th area, 40,5th area；
A kind of casting method of car body 7N01 aluminum alloy extrusion section bar ingot casting, using above-mentioned crystallizer, specific steps
Are as follows:
Step 1: melting heat preservation
According to the ingredient of car body aluminum alloy extrusion section bar, raw material is weighed, is placed in smelting furnace, carry out melting, heat preservation obtains
Molten aluminium alloy after heat preservation；
Step 2: casting
Molten aluminium alloy after heat preservation is cast in the crystallizer of the present embodiment, it is synchronous into the cooling nozzle of crystallizer
It is passed through cooling water, by the adjusting to area's cooling nozzle number each in crystallizer, to adjust each size for distinguishing water flow.
By the quantity of adjustment region, the equilibrium degree of Lai Tigao temperature gradient guarantees the uniformity of two sides grain size.
Using 700 DEG C of casting temperature, casting speed 40mm/min, total water current amount is 9.0m3/ h, wherein divide water flow
For 1 area 1.98m3/ h, 2 area 1.8m3/ h, 3 area 1.71m3/ h, 4 area 1.71m3/ h, 5 area 1.8m3/ h after casting, obtains car body
7N01 aluminum alloy extrusion section bar ingot casting；
To the present embodiment car body 7N01 aluminum alloy extrusion section bar obtained with ingot casting after low power detects, close to casting
The grain size of inlet side is 2 grades, and the grain size of the other side is 2 grades, and two sides grain size is identical.Ingot casting is squeezed into " work " type
After extrudate, using identical heat treating regime, the tensile strength difference of profile two sides is 0.8MPa, and 5 meters long of profile is quenched
Afterwards, deformation laterally is twisted without torsion.
Claims (5)
1. a kind of car body aluminum alloy extrusion section bar ingot casting casting crystallizer, which is characterized in that the car body aluminum alloy extrusion section bar
It include crystallizer ontology, cooling ring and cooling system with ingot casting casting crystallizer；
The crystallizer ontology is arranged on continuous casting line, crystallizer ontology and cooling ring interference fit, sets in cooling ring
Multiple cooling nozzles are equipped with, the water inlet of cooling nozzle is connected with the water outlet of cooling system, the water outlet of cooling nozzle and cold
But the water inlet connection of system；
The cooling nozzle using the casting entrance of crystallizer as symmetry axis, present mirror symmetry distribution, casting inlet side to
The quantity of another side direction, cooling nozzle successively reduces.
2. car body aluminum alloy extrusion section bar ingot casting casting crystallizer as described in claim 1, which is characterized in that cooling nozzle
With the 1/4 of crystallizer perimeter for a subregion, blueline is mutually perpendicular to, and the casting center line of suction and blueline of crystallizer are in
45 ° of angles, wherein the casting center line of suction of crystallizer is the line of symmetry of the first subregion and third subregion；The setting of third subregion
Cooling nozzle quantity 3~4 fewer than the cooling nozzle quantity that the first subregion is arranged, third subregion setting cooling nozzle quantity
Cooling nozzle quantity than the setting of the second subregion is 1~2 few, the cooling nozzle quantity and the setting of the second subregion of the setting of the 4th subregion
Cooling nozzle it is equal.
3. car body aluminum alloy extrusion section bar ingot casting casting crystallizer as described in claim 1, which is characterized in that the vehicle
Body aluminum alloy extrusion section bar crystallizer, temperature difference≤5 DEG C on the same cooling surface of ingot casting.
4. a kind of casting method of car body aluminum alloy extrusion section bar ingot casting, which is characterized in that any using claims 1 to 3
Crystallizer described in one, comprising the following steps:
Step 1: melting heat preservation
According to the ingredient of car body aluminum alloy extrusion section bar, raw material is weighed, is placed in smelting furnace, is melted, skimmed, refined, protected
Warm 1h, the molten aluminium alloy after being kept the temperature；
Step 2: casting
Molten aluminium alloy after heat preservation is cast in crystallizer, synchronization is passed through cooling water into the cooling nozzle of crystallizer, cold
But water makes temperature difference≤5 DEG C of the ingot casting on same cooling surface, and cast temperature is 700~730 DEG C, and casting speed is 40~
50mm/min obtains car body aluminum alloy extrusion section bar ingot casting.
5. the casting method of car body aluminum alloy extrusion section bar ingot casting as claimed in claim 4, which is characterized in that the step
Different according to the specification of ingot casting in rapid 2, cooling water flow is different, specifically, when ingot casting is 550~600mm of Ф, cooling water
Total flow is 8.5~9.0m3/ h, according to the cooling nozzle number of cooling nozzle subregion, positioned at point of the casting entrance of crystallizer
Qu Zhong, point water flow of cooling water divide water flow >=0.08~0.3m than the subregion of its opposite side3/ h, from crystallizer
The subregion of casting entrance carries out transition direction to the subregion of its opposite side, and next subregion divides water flow relative to upper one
Subregion divides water flow≤0.03~0.2m3/h。
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Citations (7)
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| US4493361A (en) * | 1981-12-07 | 1985-01-15 | Gus Sevastakis | Continuous casting apparatus |
| CN102248138A (en) * | 2011-07-22 | 2011-11-23 | 北京科技大学 | Horizontal continuous casting crystallizer capable of realizing circumferential uniform cooling |
| CN202155493U (en) * | 2011-07-08 | 2012-03-07 | 河北钢铁股份有限公司唐山分公司 | Cooling structure for wide-surface copper plate of crystallizer of continuous slab casting machine |
| CN202715800U (en) * | 2012-06-18 | 2013-02-06 | 钢铁研究总院 | Funnel type crystallizer copper plate with cooling water gaps in non-uniform distribution |
| JP5168591B2 (en) * | 2009-03-30 | 2013-03-21 | 日立電線株式会社 | Water-cooled mold for continuous casting and ingot manufacturing method |
| CN203917841U (en) * | 2014-04-30 | 2014-11-05 | 苏州有色金属研究院有限公司 | The nearly end form ingot casting of aluminium alloy Semi-continuous casting crystallizer |
| CN206794695U (en) * | 2017-03-21 | 2017-12-26 | 江油市重鑫特种金属材料有限公司 | A kind of uniformly side's of cooling crystallizer |
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2019
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|---|---|---|---|---|
| US4493361A (en) * | 1981-12-07 | 1985-01-15 | Gus Sevastakis | Continuous casting apparatus |
| JP5168591B2 (en) * | 2009-03-30 | 2013-03-21 | 日立電線株式会社 | Water-cooled mold for continuous casting and ingot manufacturing method |
| CN202155493U (en) * | 2011-07-08 | 2012-03-07 | 河北钢铁股份有限公司唐山分公司 | Cooling structure for wide-surface copper plate of crystallizer of continuous slab casting machine |
| CN102248138A (en) * | 2011-07-22 | 2011-11-23 | 北京科技大学 | Horizontal continuous casting crystallizer capable of realizing circumferential uniform cooling |
| CN202715800U (en) * | 2012-06-18 | 2013-02-06 | 钢铁研究总院 | Funnel type crystallizer copper plate with cooling water gaps in non-uniform distribution |
| CN203917841U (en) * | 2014-04-30 | 2014-11-05 | 苏州有色金属研究院有限公司 | The nearly end form ingot casting of aluminium alloy Semi-continuous casting crystallizer |
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Application publication date: 20190723 |