CN107486551A - A kind of casting technique and solidified structure regulation and control method of aluminium alloy thin-walled nacelle casting - Google Patents
A kind of casting technique and solidified structure regulation and control method of aluminium alloy thin-walled nacelle casting Download PDFInfo
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- CN107486551A CN107486551A CN201710754878.8A CN201710754878A CN107486551A CN 107486551 A CN107486551 A CN 107486551A CN 201710754878 A CN201710754878 A CN 201710754878A CN 107486551 A CN107486551 A CN 107486551A
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- 238000005266 casting Methods 0.000 title claims abstract description 102
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 8
- 238000011049 filling Methods 0.000 claims abstract description 8
- 230000006835 compression Effects 0.000 claims description 63
- 238000007906 compression Methods 0.000 claims description 63
- 238000007711 solidification Methods 0.000 claims description 23
- 230000008023 solidification Effects 0.000 claims description 23
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 17
- 229910052782 aluminium Inorganic materials 0.000 claims description 17
- 230000000740 bleeding effect Effects 0.000 claims description 2
- 230000000994 depressogenic effect Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 239000013078 crystal Substances 0.000 abstract description 8
- 230000003031 feeding effect Effects 0.000 abstract description 3
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 238000010010 raising Methods 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 16
- 229910052602 gypsum Inorganic materials 0.000 description 15
- 239000010440 gypsum Substances 0.000 description 15
- 238000002425 crystallisation Methods 0.000 description 13
- 230000008025 crystallization Effects 0.000 description 13
- 239000004576 sand Substances 0.000 description 11
- 238000009413 insulation Methods 0.000 description 8
- 244000035744 Hura crepitans Species 0.000 description 6
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 239000000155 melt Substances 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 210000001367 artery Anatomy 0.000 description 4
- 230000015271 coagulation Effects 0.000 description 4
- 238000005345 coagulation Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 210000003462 vein Anatomy 0.000 description 4
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- HIGRAKVNKLCVCA-UHFFFAOYSA-N alumine Chemical compound C1=CC=[Al]C=C1 HIGRAKVNKLCVCA-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
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- 238000010791 quenching Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/02—Use of electric or magnetic effects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention provides a kind of casting method of aluminium alloy thin-walled nacelle casting, type is filled using three-level, the second level and the third level that the three-level is filled in type are that type is filled in electromagnetic field.It is raising melt mold-filling capacity, the casting technique of the aluminium alloy thin-walled nacelle casting of enhancing feeding effect, crystal grain refinement and solidified structure regulate and control method.
Description
Technical field
The present invention relates to a kind of casting technique of aluminium alloy thin-walled nacelle casting and solidified structure regulation and control method.
Background technology
In fields such as Aero-Space, weaponry, automobile, electronics, ships, to meet that the design of lightweight and integration will
Ask, the demand of aluminium alloy thin-walled nacelle casting and application are just more and more extensive.Such casting has " large-scale, thin-walled, complexity, height
The features such as performance ", main body 2~4mm of wall thickness, thin-walled accounting is more than 80%, and die cavity vapour lock is big when filling type, blind chamber and abrupt change of cross-section knot
Occur turbulent flow at structure, cause casting the defects of misrun, volume gas, cold shut occur.Solidified under gravity, thick equiax crystal divides melt
Isolated small molten bath is divided into, numerous thick big, the scattered thermal center areas of casting cannot get feeding, will form the defects of shrinkage cavity is loose.Meanwhile
Because solidification supercooling effect is poor, heat transfer is not smooth, causes dendrite undue growth, deteriorates cast structure and performance.At present, the country is directed to
The problem of misrun of aluminium alloy thin-walled nacelle casting, structure property difference, also expands correlative study, is concentrated mainly on vacuum increasing
The exploitation of the new technologies such as pressure/counter-pressure casting, plaster molding for investment casting, ultrasonic wave, electromagnetic field crystal grain thinning etc., and achieve
Certain effect, but to casting fill type and solidified structure improvement is limited.
The content of the invention
Present invention aims at provide a kind of aluminium alloy for improving melt mold-filling capacity, enhancing feeding effect, crystal grain refinement
Casting technique and solidified structure the regulation and control method of thin-walled nacelle casting.
The purpose of the present invention is realized by such technical scheme：
A kind of casting method of aluminium alloy thin-walled nacelle casting, fills type, the second level that the three-level is filled in type using three-level
It is that type is filled in electromagnetic field with the third level.Preferably, the electromagnetic frequency is 50~100Hz.Further, the first order is filled type and added
Pressure speed is 1.3~1.5KPa/s, and it is 1.0~1.2KPa/s that type compression rate is filled in the second level, and the third level fills type compression rate and is
0.8~1.0KPa/s.
Above-mentioned three-level carries out two-stage pressurizing solidification after filling type.Electromagnetic frequency in the compression solidification is 150~250Hz,
By pressure it is 15~30s as 4~6KPa, dwell time is risen to using 0.6~0.8KPa/s compression rate；Second level compression solidification
It is by pressure rise to 450~500KPa with 1.2~1.5KPa/s compression rate, the dwell time is 1500~1800s.
The casting method of above-mentioned aluminium alloy thin-walled nacelle casting, comprises the following steps：
(1) aluminum melt refined is transferred in holding furnace, 690~720 DEG C of holding temperature, stirred；
(2) vacuumize：Using the near 20~30KPa of vavuum pump evacuated pressure；
(3) one-level fills type：Compression rate is 1.3~1.5KPa/s；
(4) two level fills type：Magnetic field generator is opened, electromagnetic frequency is 50~100Hz, and compression rate is 1.0~1.2KPa/
S, two level is filled type and terminated when melt is flow in the middle part of casting mold；
(5) three-level fills type：Compression rate is down to 0.8~1.0KPa/s, and three-level is filled type and terminated when melt is flow at the top of casting mold；
(6) one-level compression solidification：The electromagnetic frequency of magnetic field generator is promoted to 150~250Hz, by 0.6~0.8KPa/
S compression rate, by 4~6KPa of pressure rise, the dwell time is 15~30s；
(7) two-stage pressurizing solidifies：By 1.2~1.5KPa/s compression rate, pressure rise to 450~500KPa is protected
The pressure time is 1500~1800s；
(8) release：Magnetic field generator is closed, opening air bleeding valve, which unloads, is depressed into normal pressure.
More specifically, the casting method of above-mentioned aluminium alloy thin-walled nacelle casting, comprises the following steps：
(1) preparation process before pouring into a mould：The aluminum melt refined is transferred in holding furnace into (690~720 DEG C of holding temperature) to treat
With opening magnetic stirrer, cover median septum, insert the stalk of 4~6mm spray refractory coating；Fusible pattern gypsum mould is put
Put on median septum, sandbox selection is stainless steel, reduces the shielding action to electromagnetic field；Magnetic field is placed at the top of sand mold
Device, pressure regulator are placed on counter-pressure casting device external, compressed at the top of sand mold with pressing plate, it is ensured that casting mold and stalk good seal；
Then by type is low, in type, in type top and runout line access level monitoring system, covers tank, is locked by hydraulic locking mechanism.
(2) vacuum step：Tank communicating valve up and down is first turned on, upper and lower tank is vacuumized simultaneously using vavuum pump, works as pressure
During the near 20~30KPa of power, stop vacuumizing, close communicating valve.
(3) one-level fills type step：By the way of lower canister incoming gas, it is 1.3~1.5KPa/s that one-level, which fills type compression rate, is melted
Body flow to casting mold bottom under gas pressure along stalk, and type bottom signal lamp is bright, and one-level is filled type and terminated.
(4) two level fills type step：Magnetic field generator is opened, electromagnetic frequency is 50~100Hz, the aluminum melt to entering die cavity
Implement microcosmic disturbance, it is 1.0~1.2KPa/s that two level, which fills type compression rate, and when melt is flow in the middle part of casting mold, signal lamp is bright in type,
Two level is filled type and terminated.
(5) three-level fills type step：To ensure that it is steady that melt fills type, prevent liter too fast melt of liquid speed rate from being emitted at the top of casting mold
Go out, cause artillery fire phenomenon, three-level fills type compression rate and is down to 0.8~1.0KPa/s, and electromagnetic frequency is 50~100Hz, melt flow
When at the top of to casting mold, type top signal lamp is bright, and three-level is filled type and terminated.
(6) one-level compression solidification step：The electromagnetic frequency of magnetic field generator is promoted to 150~250Hz, strengthens electromagnetism arteries and veins
Power；Then 0.6~0.8KPa/s compression rate is pressed, lower pressure tank is raised into 4~6KPa, the dwell time is 15~30s, is protected
Demonstrate,prove the melt crust of mold cavity surface.
(7) two-stage pressurizing coagulation step：1.2~1.5KPa/s compression rate is pressed to upper and lower tank, by pressure rise extremely
450~500KPa, by PID control numeral combination valve, keep upper and lower tank pressure difference constant, realize that aluminum melt solidifies under high pressure
Crystallization, the crystallization dwell time is 1500~1800s.
(8) release step：After dwell time arrives, magnetic field generator is closed, tank communicating valve up and down is opened, then opens exhaust
Valve, while to upper and lower tank release, after pressure is down to normal pressure, tank in opening, hang out casting mold and stalk, clear up Casting Equipment.
Beneficial effect
1. the present invention devised in type bottom → type by level monitoring system → the three-level Vacuum Pressure Swing difference on type top fills pattern
Formula, optimize Vacuum Filling fluidised form, lift the thin-walled mold-filling capacity of melt, flowing during 700 DEG C of pouring temperatures of ZL114A aluminium alloys
Property 385~410mm is promoted to by 325~355mm, ensure that the long flow of thin-wall aluminum alloy nacelle casting steadily sequentially fills type, press down
Type defect is filled in system turbulent flow, volume gas, oxidation etc..
2. the present invention devises the two-stage pressurizing solidification model of crust pressurization+crystallization pressurization, melt top layer forms 2~5mm
Shell, reduce penetration, improve surface quality of continuous castings；Melt is in 500~550KPa solidification and crystallizations, raising melt feeding effect
Fruit, eliminate shrinkage cavity and porosity defect, Internal Quality of Cast lifting II~III credit ratings.
3. the present invention devises the compound outfield solidified structure regulation and control model of field of magnetic forece+pressure field, pass through the electromagnetism of lower room
Agitator carries out second homogenisation processing to aluminum melt, and guarantee fills type bath composition uniformity, realizes aluminium alloy (such as ZL205A)
Cu elemental compositions deviation≤± 5%；The field generator for magnetic of upper chamber implements microcosmic disturbance to the aluminum melt in solidification, crushes branch
Brilliant arm, crystal grain refinement is to 25~45 μm；Feeding a casting passage is got through by high freezing pressure, realizes the densification of solidified structure,
Compared to gravitational casting casting body mechanical property lifting more than 30%.
5. aluminium alloy (such as ZL205A) casting body appointed part tensile strength produced by the present invention reaches 500MPa, extension
Rate 8%, pinhole rate I levels, gas porosity I levels.
6. for aluminium alloy thin-walled nacelle casting, the two big technical barrier present in development and production at present：One
It is misrun caused by the thin-wall construction of large area, second, the volume contraction in numerous thick big, the scattered thermal center areas of casting cannot mend
Fill, caused structure property is poor.And this technique and tissue modulation method can thoroughly solve the above problems, excellent performance casting is obtained
Part, have been achieved with producing in batches, there is clear process, stability height, strong applicability, application value is higher, work
Industry has a high potential.
Brief description of the drawings
The casting technique curve of the aluminium alloy thin-walled nacelle casting of Fig. 1；
Fig. 2 fills type and the setting schematic diagram in solidification stages magnetic force outfield：Tank on 1.；2. casting mold；3. median septum；4. lower tank；
5. holding furnace；6. magnetic stirrer, 7. magnetic field generators；8. vacuum valve；9. level monitoring system；10. vent valve；11. pressurization
Valve；12 vacuum valves；13 aluminum melts.
Embodiment
The present invention is specifically described below by embodiment, it is necessary to it is pointed out here that be that the present embodiment can only be used
It is further described in the present invention, it is impossible to be interpreted as limiting the scope of the invention, the people that is skilled in technique in the field
Member can make some nonessential modifications and adaptations according to the content of the invention described above.
Embodiment 1
Using certain aluminium alloy thin-walled nacelle casting as application, specific profile size：High 1453mm, small end circle Φ
286.5mm, big end moment shape 500mm × 420mm, main body wall thickness 3.0mm, thin-walled accounting is more than 90%, the more boss in inner chamber, muscle, material
Material：ZL114A.
Casting mold can be prepared according to following steps：
(1) according to casting group type figure, wax pattern is welded according to wax pattern preparation process group；After the completion of group weldering, wax pattern is placed centrally
Onto grouting backing plate, the gap between sandbox and the backing plate part that is in the milk is blocked with gypsum slurry, after plugged zone (2~5mm) solidifies,
Gentle injection liquid wax, complete ceroplastic vanning and fixation on grouting backing plate.
(2) high intensity α gypsum (270 mesh) 345Kg, alumine powder (270 mesh~320 mesh) 458Kg, silica flour are weighed
(40 mesh~70 mesh) 115kg, quartz sand (20 mesh~40 mesh) 86kg, magnesium sulfate 68kg, glass fibre (60~80 μm) 2.8kg,
Gypsum mould powder is blended using batch mixer, and is sealed.
(3) water 344Kg, citric acid 5.3Kg, n-octyl alcohol 3.3Kg are weighed；First load weighted water is poured into agitator, then
Load weighted 1% citric acid solution, n-octyl alcohol are added, is stirred using handheld blender (300~500n/min), is added while stirring
Enter load weighted powder progress slurry to be blended, after the completion of being blended, check uniformity, will not mix uniform block gypsum material point
Dissipate, every barrel of mixing time about 2~2.5 minutes.
(4) gypsum slurry being blended is stood into 1min, be diagonally in the milk simultaneously in sandbox, in irrigation process, wax-pattern is easy
Collection deposits the position of bubble, tries to eliminate bubble by hand, while the difference in height for observing slurry liquid level inside and outside wax pattern is less than 20mm, pours
Stood at room temperature after filling and spontaneously dry 36h.
(5) gypsum mould of pouring is hung in mold roasting stove, roasting technique is：Room temperature → 150 DEG C (insulation 7h) →
250 DEG C (insulation 10h) → 350 DEG C (insulation 2h) → 450 DEG C (insulation 2h) → 550 DEG C (insulation 2h) → 650 DEG C (insulation 2h) →
700 DEG C (insulation 12h) → 300 DEG C (insulation 36h), each heat up platform in roasting, heating-up time 30min.
(5) silica sand (40 mesh~70 mesh) 155Kg is weighed, chromite sand (50 mesh~100 mesh) 127Kg, menaccanite (70 mesh
~140 mesh) 119Kg, emergy (90 mesh~150 mesh) 85Kg；After being mixed using puddle mixer, it is fitted into stainless steel cask, Ran Houfang
Enter and processing is dried in box drying box, it is stand-by that 4h is incubated under 300 ± 10 DEG C of environment；Roasting gypsum mould is hung out,
Dried Quench sand is loaded from the exhaust passage at the top of gypsum mould, completes the preparation of casting mold.
Mold characteristic effect：Gypsum mould intensity after roasting is improved to 14~16MPa, is reduced gypsum roasting cracking, is led to
Cross to form micro hole, cave, improve the gas permeability and collapsibility of gypsum；Thermal conductivity is promoted to 650~850Wm-2·K-1, casting mold
Radiating effect be effectively improved；The shrinkage cavity of casting, it is loose the defects of be improved, the sheet of ZL114A thin-walled aluminium alloy castings
Body appointed part tensile strength is promoted to 300~330MPa, and internal soundness is promoted to I levels by II~III level.
The casting method of aluminium alloy thin-walled nacelle casting, is carried out as follows：
(1) preparation process before pouring into a mould：The aluminum melt refined is transferred in holding furnace into (690~720 DEG C of holding temperature) to treat
With opening magnetic stirrer, cover median septum, insert the stalk of 4~6mm spray refractory coating；Fusible pattern gypsum mould is put
Put on median septum, sandbox selection is stainless steel, reduces the shielding action to electromagnetic field；Magnetic field is placed at the top of sand mold
Device, pressure regulator are placed on counter-pressure casting device external, compressed at the top of sand mold with pressing plate, it is ensured that casting mold and stalk good seal；
Then by type is low, in type, in type top and runout line access level monitoring system, covers tank, is locked by hydraulic locking mechanism.
(2) vacuum step：Tank communicating valve up and down is first turned on, upper and lower tank is vacuumized simultaneously using vavuum pump, works as pressure
During the near 20~30KPa of power, stop vacuumizing, close communicating valve.
(3) one-level fills type step：By the way of lower canister incoming gas, it is 1.3~1.5KPa/s that one-level, which fills type compression rate, is melted
Body flow to casting mold bottom under gas pressure along stalk, and type bottom signal lamp is bright, and one-level is filled type and terminated.
(4) two level fills type step：Magnetic field generator is opened, electromagnetic frequency is 50~100Hz, the aluminum melt to entering die cavity
Implement microcosmic disturbance, it is 1.0~1.2KPa/s that two level, which fills type compression rate, and when melt is flow in the middle part of casting mold, signal lamp is bright in type,
Two level is filled type and terminated.
(5) three-level fills type step：Three-level fills type compression rate and is down to 0.8~1.0KPa/s, and electromagnetic frequency is 50~
100Hz, when melt is flow at the top of casting mold, type top signal lamp is bright, and three-level is filled type and terminated.
(6) one-level compression solidification step：The electromagnetic frequency of magnetic field generator is promoted to 150~250Hz, strengthens electromagnetism arteries and veins
Power；Then 0.6~0.8KPa/s compression rate is pressed, lower pressure tank is raised into 4~6KPa, the dwell time is 15~30s, is protected
Demonstrate,prove the melt crust of mold cavity surface.
(7) two-stage pressurizing coagulation step：1.2~1.5KPa/s compression rate is pressed to upper and lower tank, by pressure rise extremely
450~500KPa, by PID control numeral combination valve, keep upper and lower tank pressure difference constant, realize that aluminum melt solidifies under high pressure
Crystallization, the crystallization dwell time is 1500~1800s.
(8) release step：After dwell time arrives, magnetic field generator is closed, tank communicating valve up and down is opened, then opens exhaust
Valve, while to upper and lower tank release, after pressure is down to normal pressure, tank in opening, hang out casting mold and stalk, clear up Casting Equipment.
Main technologic parameters：720 DEG C, vacuum 20KPa of pouring temperature, one-level fills type compression rate 1.3KPa/s, two level
Fill type compression rate 1.1KPa/s, three-level fills type compression rate 1.0KPa/s, electromagnetic frequency 220Hz, the pressurization of one-level compression solidification
Speed 0.8KPa/s, investing time 20s, two-stage pressurizing solidification compression rate 1.3KPa/s, crystallization time 1800s.
Implementation result：
Flowing is promoted to 385~410mm during cast, and the long flow of thin-wall aluminum alloy nacelle casting steadily sequentially fills type.Close
Elemental composition deviation≤± 3% such as Mg, Ti, Be of gold；Crystal grain refinement is to 25~45 μm；Mechanical property lifting more than 30%.
Casting body appointed part tensile strength reaches 320MPa, elongation percentage 3.0%, pinhole rate I levels, gas porosity I levels.
Embodiment 2
Using certain aluminium alloy thin-walled nacelle casting as application, specific profile size：Small end justifies Φ 295mm, big end circle Φ
340mm, high 710m, main body wall thickness 3.5mm, thin-walled accounting is more than 85%, in father-in-law's shape structure, material：ZL101A.
The casting method of aluminium alloy thin-walled nacelle casting, is carried out as follows：
(1) preparation process before pouring into a mould：The aluminum melt refined is transferred in holding furnace into (690~720 DEG C of holding temperature) to treat
With opening magnetic stirrer, cover median septum, insert the stalk of 4~6mm spray refractory coating；Fusible pattern gypsum mould is put
Put on median septum, sandbox selection is stainless steel, reduces the shielding action to electromagnetic field；Magnetic field is placed at the top of sand mold
Device, pressure regulator are placed on counter-pressure casting device external, compressed at the top of sand mold with pressing plate, it is ensured that casting mold and stalk good seal；
Then by type is low, in type, in type top and runout line access level monitoring system, covers tank, is locked by hydraulic locking mechanism.
(2) vacuum step：Tank communicating valve up and down is first turned on, upper and lower tank is vacuumized simultaneously using vavuum pump, works as pressure
During the near 20~30KPa of power, stop vacuumizing, close communicating valve.
(3) one-level fills type step：By the way of lower canister incoming gas, it is 1.3~1.5KPa/s that one-level, which fills type compression rate, is melted
Body flow to casting mold bottom under gas pressure along stalk, and type bottom signal lamp is bright, and one-level is filled type and terminated.
(4) two level fills type step：Magnetic field generator is opened, electromagnetic frequency is 50~100Hz, the aluminum melt to entering die cavity
Implement microcosmic disturbance, it is 1.0~1.2KPa/s that two level, which fills type compression rate, and when melt is flow in the middle part of casting mold, signal lamp is bright in type,
Two level is filled type and terminated.
(5) three-level fills type step：Electromagnetic frequency is 50~100Hz, and three-level fills type compression rate and is down to 0.8~1.0KPa/
S, when melt is flow at the top of casting mold, type top signal lamp is bright, and three-level is filled type and terminated.
(6) one-level compression solidification step：The electromagnetic frequency of magnetic field generator is promoted to 150~250Hz, strengthens electromagnetism arteries and veins
Power；Then 0.6~0.8KPa/s compression rate is pressed, lower pressure tank is raised into 4~6KPa, the dwell time is 15~30s, is protected
Demonstrate,prove the melt crust of mold cavity surface.
(7) two-stage pressurizing coagulation step：1.2~1.5KPa/s compression rate is pressed to upper and lower tank, by pressure rise extremely
450~500KPa, by PID control numeral combination valve, keep upper and lower tank pressure difference constant, realize that aluminum melt solidifies under high pressure
Crystallization, the crystallization dwell time is 1500~1800s.
(8) release step：After dwell time arrives, magnetic field generator is closed, tank communicating valve up and down is opened, then opens exhaust
Valve, while to upper and lower tank release, after pressure is down to normal pressure, tank in opening, hang out casting mold and stalk, clear up Casting Equipment.
Main technologic parameters：700 DEG C, vacuum 20KPa of pouring temperature, one-level fills type compression rate 1.2KPa/s, two level
Fill type compression rate 1.0KPa/s, three-level fills type compression rate 0.8KPa/s, electromagnetic frequency 180Hz, the pressurization of one-level compression solidification
Speed 0.8KPa/s, investing time 15s, two-stage pressurizing solidification compression rate 1.2KPa/s, crystallization time 1500s.
Implementation result：
Flowing is promoted to 390~420mm during cast, and the long flow of thin-wall aluminum alloy nacelle casting steadily sequentially fills type.Close
Elemental composition deviation≤± 3% such as Mg, Ti of gold；Crystal grain refinement is to 30~50 μm；Mechanical property lifting more than 30%.
Casting body appointed part tensile strength reaches 290MPa, elongation percentage 8.0%, pinhole rate I levels, gas porosity I levels.
Embodiment 3
Using certain aluminium alloy thin-walled nacelle casting as application, specific profile size：Height 720mm, small end circle Φ
610mm, big end circle Φ 750mm, main body wall thickness 4.0mm, thin-walled accounting is more than 80%, the more reinforcements in inner chamber, thick big boss etc., material
Material：ZL205A.
The casting method of aluminium alloy thin-walled nacelle casting, is carried out as follows：
(1) preparation process before pouring into a mould：The aluminum melt refined is transferred in holding furnace into (690~720 DEG C of holding temperature) to treat
With opening magnetic stirrer, cover median septum, insert the stalk of 4~6mm spray refractory coating；Fusible pattern gypsum mould is put
Put on median septum, sandbox selection is stainless steel, reduces the shielding action to electromagnetic field；Magnetic field is placed at the top of sand mold
Device, pressure regulator are placed on counter-pressure casting device external, compressed at the top of sand mold with pressing plate, it is ensured that casting mold and stalk good seal；
Then by type is low, in type, in type top and runout line access level monitoring system, covers tank, is locked by hydraulic locking mechanism.
(2) vacuum step：Tank communicating valve up and down is first turned on, upper and lower tank is vacuumized simultaneously using vavuum pump, works as pressure
During the near 20~30KPa of power, stop vacuumizing, close communicating valve.
(3) one-level fills type step：By the way of lower canister incoming gas, it is 1.3~1.5KPa/s that one-level, which fills type compression rate, is melted
Body flow to casting mold bottom under gas pressure along stalk, and type bottom signal lamp is bright, and one-level is filled type and terminated.
(4) two level fills type step：Magnetic field generator is opened, electromagnetic frequency is 50~100Hz, the aluminum melt to entering die cavity
Implement microcosmic disturbance, it is 1.0~1.2KPa/s that two level, which fills type compression rate, and when melt is flow in the middle part of casting mold, signal lamp is bright in type,
Two level is filled type and terminated.
(5) three-level fills type step：Electromagnetic frequency is 50~100Hz, and three-level fills type compression rate and is down to 0.8~1.0KPa/
S, when melt is flow at the top of casting mold, type top signal lamp is bright, and three-level is filled type and terminated.
(6) one-level compression solidification step：The electromagnetic frequency of magnetic field generator is promoted to 150~250Hz, strengthens electromagnetism arteries and veins
Power；Then 0.6~0.8KPa/s compression rate is pressed, lower pressure tank is raised into 4~6KPa, the dwell time is 15~30s, is protected
Demonstrate,prove the melt crust of mold cavity surface.
(7) two-stage pressurizing coagulation step：1.2~1.5KPa/s compression rate is pressed to upper and lower tank, by pressure rise extremely
450~500KPa, by PID control numeral combination valve, keep upper and lower tank pressure difference constant, realize that aluminum melt solidifies under high pressure
Crystallization, the crystallization dwell time is 1500~1800s.
(8) release step：After dwell time arrives, magnetic field generator is closed, tank communicating valve up and down is opened, then opens exhaust
Valve, while to upper and lower tank release, after pressure is down to normal pressure, tank in opening, hang out casting mold and stalk, clear up Casting Equipment.
Main technologic parameters：690 DEG C, vacuum 20KPa of pouring temperature, one-level fills type compression rate 1.3KPa/s, two level
Fill type compression rate 1.0KPa/s, three-level fills type compression rate 0.9KPa/s, electromagnetic frequency 200Hz, the pressurization of one-level compression solidification
Speed 1.0KPa/s, investing time 15s, two-stage pressurizing solidification compression rate 1.0KPa/s, crystallization time 1680s.
Implementation result：
Flowing is promoted to 280~320mm during cast, and the long flow of thin-wall aluminum alloy nacelle casting steadily sequentially fills type.Close
Elemental composition deviation≤± 5% such as Cu, Mn, Ti of gold；Crystal grain refinement is to 20~40 μm；Mechanical property lifting more than 35%.
Casting body appointed part tensile strength reaches 500MPa, elongation percentage 8%, pinhole rate I levels, gas porosity I levels.
Claims (6)
1. a kind of casting method of aluminium alloy thin-walled nacelle casting, fills type using three-level, the second level that the three-level is filled in type and
The third level is that type is filled in electromagnetic field.
2. the casting method of aluminium alloy thin-walled nacelle casting as claimed in claim 1, electromagnetic frequency is 50 ~ 100Hz when filling type.
3. the casting method of aluminium alloy thin-walled nacelle casting as claimed in claim 1 or 2, the first order fill type compression rate and are
1.3 ~ 1.5KPa/s, it is 1.0 ~ 1.2KPa/s that type compression rate is filled in the second level, and it is 0.8 ~ 1.0KPa/ that the third level, which fills type compression rate,
s。
4. the casting method of the aluminium alloy thin-walled nacelle casting as described in claim 1,2 or 3, progress two level adds after three-level fills type
Pressure solidification.
5. the casting method of the aluminium alloy thin-walled nacelle casting as described in claim 1-4 is any, the electricity in the compression solidification
Magnet rate is 150 ~ 250Hz, using 0.6 ~ 0.8KPa/s compression rate by pressure to rise to 4 ~ 6KPa, the dwell time is 15 ~
30s；Second level compression solidification is to be by pressure rise to 450 ~ 500KPa, dwell time with 1.2 ~ 1.5KPa/s compression rate
1500~1800s。
6. the casting method of the aluminium alloy thin-walled nacelle casting as described in claim 1-5 is any, comprises the following steps：
（1）The aluminum melt refined is transferred in holding furnace, 690 ~ 720 DEG C of holding temperature；
（2）Vacuumize：Using vavuum pump evacuated pressure to 20~30KPa；
（3）One-level fills type：Compression rate is 1.3 ~ 1.5KPa/s；
（4）Two level fills type：Magnetic field generator is opened, electromagnetic frequency is 50 ~ 100Hz, and compression rate is 1.0 ~ 1.2KPa/s, melt
Two level is filled type and terminated when flowing in the middle part of casting mold；
（5）Three-level fills type：Compression rate is down to 0.8 ~ 1.0KPa/s, and three-level is filled type and terminated when melt is flow at the top of casting mold；
（6）One-level compression solidification：The electromagnetic frequency of magnetic field generator is promoted to 150 ~ 250Hz, by adding for 0.6 ~ 0.8KPa/s
Speed is pressed, by 4 ~ 6KPa of pressure rise, the dwell time is 15 ~ 30s；
（7）Two-stage pressurizing solidifies：By 1.2 ~ 1.5KPa/s compression rate, by pressure rise to 450 ~ 500KPa, dwell time
For 1500 ~ 1800s；
（8）Release：Magnetic field generator is closed, opening air bleeding valve, which unloads, is depressed into normal pressure.
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| CN109047722A (en) * | 2018-10-24 | 2018-12-21 | 西北工业大学 | A kind of adjustable pressure casting push-pull type air-channel system and its method |
| CN109128097A (en) * | 2018-10-17 | 2019-01-04 | 南昌航空大学 | A kind of Vacuum Differential Pressure Casting classification compression solidification starts melt temperature method of pressurizeing |
| CN109434077A (en) * | 2018-12-27 | 2019-03-08 | 南昌航空大学 | A kind of vacuum pressing and casting forming device and air-channel system based on electromagnetic field |
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| CN109128097A (en) * | 2018-10-17 | 2019-01-04 | 南昌航空大学 | A kind of Vacuum Differential Pressure Casting classification compression solidification starts melt temperature method of pressurizeing |
| CN109047722A (en) * | 2018-10-24 | 2018-12-21 | 西北工业大学 | A kind of adjustable pressure casting push-pull type air-channel system and its method |
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