CN109055786A - A kind of production technology of 6 line aluminium alloy casting rod - Google Patents
A kind of production technology of 6 line aluminium alloy casting rod Download PDFInfo
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- CN109055786A CN109055786A CN201810998772.7A CN201810998772A CN109055786A CN 109055786 A CN109055786 A CN 109055786A CN 201810998772 A CN201810998772 A CN 201810998772A CN 109055786 A CN109055786 A CN 109055786A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- 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
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/003—Aluminium alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Continuous Casting (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to aluminium alloy casting technology fields, are related to a kind of production technology of 6 line aluminium alloy casting rods, and production technology mainly includes melting, slagging-off, refining, refinement, filtering, degasification and casting, and wherein refining agent employed in refining process is CaCO3And SrCO3Powder is ground into the powder of 30~40 μm of partial sizes according to the proportion that mass parts ratio is 1~19: 1 after evenly mixing, it joined Al-Ti-B fining agents in thinning process and carry out online refinement, degasification is carried out to molten aluminum using graphite rotator in degassing procedure, the hydrogen content of molten aluminum liquid is controlled substantially within 0.2ml/100g Al, a kind of good refining agent is provided for 6 line aluminium alloys, solves the problems, such as that there are refining effects is bad when existing refining agent is useful in the preparation of 6 line aluminium alloy casting rods.
Description
Technical field
The invention belongs to aluminium alloy casting technology fields, are related to a kind of production technology of 6 line aluminium alloy casting rods.
Background technique
During melting and casting, the hydrogen atom dissolved in melt is easy shape after being precipitated in casting solidification for aluminium and aluminium alloy
At bubble, aluminium and aluminium alloy cast ingot or casting is caused to generate defect.Melt and air reaction form oxygen in fusion process simultaneously
Compound, being involved in melt leads to the reduction of its degree of purity, if not being removed in postorder production, forms oxygen in ingot casting or casting
Compound is mingled with, and influences product properties.Therefore hydrogen content and removing must be reduced by refining treatment in aluminium and aluminium alloy production
Field trash.Aluminium and aluminium alloy are during casting solidification, if without additional grain refiner.There is no heterogeneous shape in melt then
Core influences ingot casting or cast properties then will lead to coarse grains in process of setting.
In aluminium alloy casting process, refining is a vital link, is removed in molten aluminum by the way that refining agent is added
Gas and nonmetallic Slag inclusion, however after the refining agent of the prior art is useful on 6 line aluminium alloys, aluminium alloy cast rod can be made
Refining effect it is bad, the hydrogen content in molten aluminum liquid is higher, the aluminium alloy cast rod of preparation can slag inclusion bubble so that final preparation
Aluminium alloy cast rod mechanical property and can be all greatly affected with yield rate.
Summary of the invention
In view of this, the present invention refines to solve to exist when existing refining agent is useful in the preparation of 6 line aluminium alloy casting rods
Ineffective problem provides a kind of production technology of 6 line aluminium alloy casting rods.
In order to achieve the above objectives, the present invention provides a kind of production technology of 6 line aluminium alloy casting rods, comprising the following steps:
A, melting: according to the mass percent of each element in aluminium alloy cast rod raw material be equipped with aluminium alloy to be cast it is each at
Point, by the melting after evenly mixing into smelting furnace of each ingredient uniform feeding of aluminium alloy, controlling smelting temperature is 710~760 DEG C；
B, it removes the gred: the molten aluminum liquid of step A being stirred, is skimmed, remove the big impurity in molten aluminum, stirred every 10min
It mixes once, stirs 10min every time；
C, it refines: by CaCO3And SrCO3Powder is ground into after evenly mixing according to the proportion that mass parts ratio is 1~19: 1
The powder of 30~40 μm of partial sizes does refining agent, and the consumption of refining agent is 10kg/t aluminium, and the refining agent composition after grinding is thrown
In molten aluminum after entering step B removal of impurities, the gas and sulphur, phosphorus objectionable impurities in molten aluminum are removed；
D, refine: by step B refining after molten aluminum in add Ti content 5%, B content 1% Al-Ti-B silk fining agent into
Row online refinement, fining agent additive amount are 0.2kg/t aluminium；
F, it filters: the molten aluminum after refinement is passed through into the impurity in filter filtering molten aluminum；
G, degasification: degasification is carried out to molten aluminum using graphite rotator, protective gas is high purity inert gas, each graphite rotator
Revolving speed control in 300~450r/min, at 710~735 DEG C, the hydrogen content of molten aluminum liquid is controlled in 0.2ml/ for temperature control
Within 100gAl；
H, it casts: the molten aluminum after the degasification that removes the gred being transferred in founding standing furnace, to the molten aluminum in standing furnace using semicontinuous
Casting is cast, and casting temperature is 730~740 DEG C, and casting speed is 20~22mm/min, and single branch water flow 300~
A small amount of molten aluminum is first slowly flowed into crystallizer when wherein molten aluminum casting starts, when molten aluminum rises to crystallizer graphite annulus by 310L/min
It keeps starting to cast when 50~70s at lower section 1/3, casting cooling water is first closed after casting, it is complete to aluminium alloy cast rod tail end
The aluminium alloy cast rod after casting is transported to designated position after full solidification.
Further, the feeding sequence of each ingredient of aluminium alloy is first high-melting-point, rear low melting point, first small density, rear big in step A
Density.
Further, step B uses electromagnetic mixing apparatus uniform stirring to the process that molten aluminum liquid stirs.
Further, step B is that molten aluminum liquid is passed through the chute mistake with ceramic filter plate to the process that molten aluminum liquid is skimmed
The impurity in molten aluminum is filtered, wherein ceramic filter plate is toasted in advance.
Further, CaCO in step C3Mass fraction percentage be 50~95%, SrCO3Mass fraction percentage be 5
~50%.
Further, filter screen chooses two-ply foam asbestos gauge in step F.
Further, high purity inert gas used in degasification is that perhaps argon gas nitrogen or argon gas pass through nitrogen in step G
For graphite rotator from furnace bottom injection molten aluminum, the diameter of graphite rotator is 200~400mm.
Further, a small amount of molten aluminum is slowly flowed again after fine aluminium bits in dummy bar head upper berth used in step H before molten aluminum casting
Into crystallizer, cast when keeping 50~70s at below molten aluminum rises to crystallizer graphite annulus 1/3.
The beneficial effects of the present invention are:
1, the production technology of 6 line aluminium alloy casting rod disclosed in this invention, using CaCO3And SrCO3Mixture as essence
It refines agent and replaces conventional NaNO3Refining agent, reaction mechanism are as follows: 3CaCO3+ 2Al=3CaO+Al2O3+3CO、SrCO3+ 2Al=
2Sr+Al2O3+CO+CO2.By above-mentioned reaction equation it is found that generating CO, CO during the reaction2Gas, then COx bubble exists
By spreading and dividing the hydrogen in Balance Absorption melt in floating-upward process, tiny COx bubble floating in bath surface and volatilizees.
The nocuousness field trash such as sulphur, phosphorus in melt is by the blistering effect of COx gas or inert gas that generates or floating effect from molten
The inside of body floats to its surface and cleans, while the generation of strontium can also improve the plasticity and mechanicalness of aluminium alloy extrusions
Can, SrCO3Refining agent plays a dual role of during to aluminum anodizing, and vigor is apparently higher than conventional NaNO3Refining
Agent.
2, the production technology of 6 line aluminium alloy casting rod disclosed in this invention, before aluminium alloy cast rod casting on dummy bar head
Spread fine aluminium bits, the thickness of aluminium skimmings is advisable with being no more than the dummy bar head bottom, and thick not less than 20mm because fine aluminium bits plasticity it is good,
Linear contractive quotiety is big, sensibility is low, can effectively be deformed to reduce the tensile stress of bottom, avoid stress concentrate and generate
Initial crack.Casting first puts a small amount of molten aluminum when starting and enters crystallizer, keeps when molten aluminum rises at 1/3 below crystallizer graphite annulus
It is cast when 50~70s, the aluminium alloy cast rod surface quality obtained using the technology is good, and no bottom crack generates, made
The aluminium alloy cast rod qualification rate obtained is high.
Specific embodiment
Below by a preferred embodiment of the present invention will be described in detail.
Embodiment 1
A kind of production technology of 6 line aluminium alloy casting rod, comprising the following steps:
A, melting: aluminium alloy to be cast is equipped with according to the mass percent of each element in 6082 aluminium alloy cast rod raw materials of preparation
Each ingredient, by the melting after evenly mixing into smelting furnace of each ingredient uniform feeding of aluminium alloy, controlling smelting temperature is 760 DEG C,
Wherein the feeding sequence of each ingredient of aluminium alloy is first high-melting-point, rear low melting point, first small density, rear big density；
B, it removes the gred: uniform stirring being carried out using electromagnetic mixing apparatus to the molten aluminum liquid of step A, is skimmed, is removed in molten aluminum
Big impurity, it is primary every 10min stirring, 10min is stirred every time, wherein the process skimmed is that molten aluminum liquid is passed through to band ceramics
Impurity in the chute filtering molten aluminum of filter plate, wherein ceramic filter plate is toasted in advance；
C, it refines: the CaCO for being 50% by mass fraction percentage3The SrCO for being 50% with mass fraction percentage3Uniformly
The powder that 30 μm of partial sizes are ground into after mixing does refining agent, and the consumption of refining agent is 10kg/t aluminium, by the refining agent after grinding
Mixture is put into the molten aluminum after step B removal of impurities, removes the gas and sulphur, phosphorus objectionable impurities in molten aluminum；
D, refine: by step B refining after molten aluminum in add Ti content 5%, B content 1% Al-Ti-B silk fining agent into
Row online refinement, fining agent additive amount are 0.2kg/t aluminium；
F, it filters: the molten aluminum after refinement is passed through into the impurity in two-ply foam asbestos net filtration molten aluminum；
G, degasification: degasification is carried out to molten aluminum using graphite rotator, protective gas is high-purity argon gas, and argon gas passes through graphite rotator
From furnace bottom injection molten aluminum, the diameter of graphite rotator is 200mm, and the revolving speed of each graphite rotator is controlled in 300r/min, temperature
At 735 DEG C, the hydrogen content of molten aluminum liquid is controlled within 0.2ml/100g Al for control；
H, it casts: the molten aluminum after the degasification that removes the gred being transferred in founding standing furnace, to the molten aluminum in standing furnace using semicontinuous
Casting is cast, and casting temperature is 730 DEG C, casting speed 22mm/min, single branch water flow 310L/min, wherein molten aluminum
A small amount of molten aluminum is first slowly flowed into crystallizer again after used dummy bar head upper berth fine aluminium bits before starting by casting, when molten aluminum rises to knot
It keeps starting to cast when 70s at 1/3 below brilliant device graphite annulus, casting cooling water is first closed after casting, to aluminium alloy cast rod
Tail end transports the aluminium alloy cast rod after casting to designated position after solidifying completely.
Embodiment 2
Embodiment 2 the difference from embodiment 1 is that, in step A in smelting furnace molten aluminum smelting temperature be 710 DEG C.
Embodiment 3
Embodiment 3 the difference from embodiment 1 is that, CaCO in step C refining agent3Mass fraction percentage be 95%,
SrCO3Mass fraction percentage be 5%, refining agent CaCO3And SrCO3The powder for being ground into 40 μm of partial sizes after evenly mixing is done
Refining agent.
Embodiment 4
Embodiment 4 the difference from embodiment 1 is that, CaCO in step C refining agent3Mass fraction percentage be 80%,
SrCO3Mass fraction percentage be 20%, refining agent CaCO3And SrCO3The powder for being ground into 40 μm of partial sizes after evenly mixing is done
Refining agent.
Embodiment 5
Embodiment 5 the difference from embodiment 1 is that, in step D fining agent additive amount be 0.25kg/t aluminium.
Embodiment 6
Embodiment 6 the difference from embodiment 1 is that, protective gas is high pure nitrogen in step G, and nitrogen passes through graphite rotator
From furnace bottom injection molten aluminum, the diameter of graphite rotator is 400mm, and the revolving speed of each graphite rotator is controlled in 450r/min, temperature
At 710 DEG C, the hydrogen content of molten aluminum liquid is controlled within 0.2ml/100g Al for control.
Embodiment 7
Embodiment 7 the difference from embodiment 1 is that, in step H molten aluminum casting temperature be 740 DEG C, casting speed 20mm/
Min, single branch water flow 300L/min, wherein molten aluminum casting again first will be a small amount of after used dummy bar head upper berth fine aluminium bits before starting
Molten aluminum slowly flows into crystallizer, starts to cast when keeping 50s at below molten aluminum rises to crystallizer graphite annulus 1/3, casting terminates
Casting cooling water is first closed afterwards, and the aluminium alloy cast rod after casting is transported into specific bit after aluminium alloy cast rod tail end solidifies completely
It sets.
Comparative example
Comparative example the difference from embodiment 1 is that, by NaNO in step C3The powder for being ground into 30 μm of partial sizes does refining agent,
The consumption of refining agent is 10kg/t aluminium.
Mechanical property, product qualification rate and the casting rod hydrogen content of aluminium alloy cast rod prepared by comparative example and Examples 1 to 7
Test result be shown in Table one, wherein hydrogen content refer to be added refining agent after every 100g molten aluminum liquid hydrogen content:
Table one
By table one, it can be seen that, the aluminium alloy cast rod of the production technology preparation of 6 line aluminium alloy casting rods is hydrogeneous through the invention
Amount is reduced, and can significantly reduce the bubble in aluminium alloy cast rod, while the qualification rate of aluminium alloy cast rod product is mentioned
Height, prepared aluminium alloy cast rod or aluminium alloy cast ingot surface basically will not produce stomata and crackle, substantially without not up to standard
Product, the tensile strength and elongation percentage of casting rod are also relative to using routine NaNO3The casting rod of refining agent refining has obtained substantially mentioning
It is high.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (8)
1. a kind of production technology of 6 line aluminium alloy casting rods, which comprises the following steps:
A, melting: with each ingredient of aluminium alloy to be cast according to the mass percent of each element in aluminium alloy cast rod raw material, will
The melting after evenly mixing into smelting furnace of each ingredient uniform feeding of aluminium alloy, control smelting temperature are 710~760 DEG C；
B, it removes the gred: the molten aluminum liquid of step A being stirred, is skimmed, remove the big impurity in molten aluminum, stir one every 10min
It is secondary, 10min is stirred every time；
C, it refines: by CaCO3And SrCO3Powder is ground into 30 according to the proportion that mass parts ratio is 1~19: 1 after evenly mixing~
The powder of 40 μm of partial sizes does refining agent, and the consumption of refining agent is 10kg/t aluminium, and the refining agent composition after grinding is put into step
In molten aluminum after rapid B removal of impurities, the gas and sulphur, phosphorus objectionable impurities in molten aluminum are removed；
D, it refines: Ti content 5% will be added in the molten aluminum after step B refining, the Al-Ti-B silk fining agent of B content 1% carries out
Line thinning, fining agent additive amount are 0.2kg/t aluminium；
F, it filters: the molten aluminum after refinement is passed through into the impurity in filter filtering molten aluminum；
G, degasification: carrying out degasification to molten aluminum using graphite rotator, and protective gas is high purity inert gas, and each graphite rotator turns
Speed control is in 300~450r/min, and at 710~735 DEG C, the hydrogen content of molten aluminum liquid is controlled in 0.2ml/100gAl for temperature control
Within；
H, it casts: the molten aluminum after the degasification that removes the gred is transferred in founding standing furnace, semi-continuous casting is used to the molten aluminum in standing furnace
Method is cast, and casting temperature is 730~740 DEG C, and casting speed is 20~22mm/min, 300~310L/ of single branch water flow
A small amount of molten aluminum is first slowly flowed into crystallizer when wherein molten aluminum casting starts by min, when molten aluminum rises to 1/ below crystallizer graphite annulus
It keeps starting to cast when 50~70s at 3, casting cooling water is first closed after casting, is solidified completely to aluminium alloy cast rod tail end
The aluminium alloy cast rod after casting is transported to designated position afterwards.
2. the production technology of 6 line aluminium alloy casting rod as described in claim 1, which is characterized in that each ingredient of aluminium alloy in step A
Feeding sequence be first high-melting-point, rear low melting point, first small density, rear big density.
3. the production technology of 6 line aluminium alloy casting rod as described in claim 1, which is characterized in that step B stirs molten aluminum liquid
Process use electromagnetic mixing apparatus uniform stirring.
4. the production technology of 6 line aluminium alloy casting rod as described in claim 1, which is characterized in that step B skims to molten aluminum liquid
Process be the impurity filtered molten aluminum liquid by chute with ceramic filter plate in molten aluminum, wherein ceramic filter plate in advance into
Row baking.
5. the production technology of 6 line aluminium alloy casting rod as described in claim 1, which is characterized in that CaCO in step C3Quality point
Number percentage is 50~95%, SrCO3Mass fraction percentage be 5~50%.
6. the production technology of 6 line aluminium alloy casting rod as described in claim 1, which is characterized in that filter screen is chosen double in step F
Layer foam stone cotton net.
7. the production technology of 6 line aluminium alloy casting rod as described in claim 1, which is characterized in that in step G used in degasification
High purity inert gas is that perhaps argon gas nitrogen or argon gas are injected in molten aluminum by graphite rotator from furnace bottom nitrogen, graphite rotator
Diameter be 200~400mm.
8. the production technology of 6 line aluminium alloy casting rod as described in claim 1, which is characterized in that institute before molten aluminum is cast in step H
A small amount of molten aluminum is slowly flowed into crystallizer again after the dummy bar head upper berth fine aluminium bits used, when molten aluminum rises to below crystallizer graphite annulus
It keeps being cast when 50~70s at 1/3.
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| CN201810998772.7A CN109055786A (en) | 2018-08-29 | 2018-08-29 | A kind of production technology of 6 line aluminium alloy casting rod |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113186433A (en) * | 2021-03-24 | 2021-07-30 | 辽宁忠旺集团有限公司 | 6082 aluminum alloy and process for casting to replace deformed extrusion rod by using same |
| CN114058889A (en) * | 2021-10-29 | 2022-02-18 | 上海工程技术大学 | Preparation method of high-strength high-toughness ultrafine-grained aluminum alloy |
| CN115896469A (en) * | 2022-12-21 | 2023-04-04 | 广东领胜新材料科技有限公司 | Deep degassing, impurity removing and purifying method for electrical aluminum alloy liquid |
| CN115927924A (en) * | 2022-12-21 | 2023-04-07 | 广东领胜新材料科技有限公司 | High-strength aluminum profile for solar photovoltaic bracket and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113186433A (en) * | 2021-03-24 | 2021-07-30 | 辽宁忠旺集团有限公司 | 6082 aluminum alloy and process for casting to replace deformed extrusion rod by using same |
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| CN115927924A (en) * | 2022-12-21 | 2023-04-07 | 广东领胜新材料科技有限公司 | High-strength aluminum profile for solar photovoltaic bracket and production method thereof |
| CN115927924B (en) * | 2022-12-21 | 2024-04-12 | 广东科峰铝业科技有限公司 | High-strength aluminum profile for solar photovoltaic bracket and production method thereof |
| CN115896469B (en) * | 2022-12-21 | 2024-05-14 | 广东领胜新材料科技有限公司 | Deep degassing, impurity removing and purifying method for electrical aluminum alloy liquid |
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Application publication date: 20181221 |