CN106086546B - The low-pressure casting process of aluminium alloy wheel hub - Google Patents
The low-pressure casting process of aluminium alloy wheel hub Download PDFInfo
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- CN106086546B CN106086546B CN201610727171.3A CN201610727171A CN106086546B CN 106086546 B CN106086546 B CN 106086546B CN 201610727171 A CN201610727171 A CN 201610727171A CN 106086546 B CN106086546 B CN 106086546B
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 71
- 238000005266 casting Methods 0.000 title claims abstract description 57
- 239000007788 liquid Substances 0.000 claims abstract description 66
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 53
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 53
- 239000004411 aluminium Substances 0.000 claims abstract description 52
- 238000002844 melting Methods 0.000 claims abstract description 14
- 230000008018 melting Effects 0.000 claims abstract description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000956 alloy Substances 0.000 claims abstract description 8
- 239000002075 main ingredient Substances 0.000 claims abstract description 7
- 238000007872 degassing Methods 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 230000000630 rising effect Effects 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 11
- 239000002826 coolant Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 15
- 238000002474 experimental method Methods 0.000 description 11
- 239000011777 magnesium Substances 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910001278 Sr alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- FWGZLZNGAVBRPW-UHFFFAOYSA-N alumane;strontium Chemical compound [AlH3].[Sr] FWGZLZNGAVBRPW-UHFFFAOYSA-N 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000007499 fusion processing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
-
- 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
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
-
- 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
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a kind of low-pressure casting process of aluminium alloy wheel hub, low-pressure casting process comprises the following steps：1) aluminum alloy materials progress melting is obtained into aluminium liquid, the percentage by weight of aluminium liquid Main Ingredients and Appearance is the Al of Si 6.8~7.2, Mg 4.5~5, Ti 0.1~0.15, Fe 0.05~0.1 and surplus, and the temperature of the melting is 800~950 DEG C；2) mould is preheated to 500 DEG C, and be incubated；3) aluminium liquid starts to come out of the stove at 720~730 DEG C, and through high-purity nitrogen degasification, 670~695 DEG C of low pressure casting machine holding furnace is incubated 1 hour；It is forced into 0.04~0.06Mpa to carry out rising liquid, the liter liquid time is 5~10s；It is forced into 0.08~0.1Mpa and is full of mold cavity to aluminium liquid, then pressure is adjusted to 0.06~0.07Mpa and carries out pressurize, the dwell time is 200~300s.Have high rigidity, tensile strength strong and the good characteristic of elongation percentage high tenacity by the aluminium alloy wheel hub that makes of the present invention, and the defect situation such as wheel hub is imperfect, shrinkage cavity, hot tearing and draw is few, substantially increases yield rate.
Description
Technical field
The present invention relates to auto parts and components manufacture field, in particular it relates to the low-pressure casting process of aluminium alloy wheel hub.
Background technology
With the development of society, automobile has turned into the indispensable vehicles of people's trip, automotive hub is used as automobile
In important accessory, its quality not only influences the attractive in appearance of automobile, and can influence the safety of automobile.Aluminium alloy wheel hub is due to tool
Have that lightweight, intensity is big, brake compensation performance is good, precision is high, thermal conductivity good, the low many advantages of automobile fuel consumption, wide
The general automotive hub that is applied to manufactures field.
Although the performance of aluminium alloy wheel hub is well more many than steel wheel hub, the difference of al alloy component and casting technique
It is different also make it that the performance gap of aluminium alloy wheel hub is quite big.At present, generally existing magnesium in the main aluminium alloy wheel hub product of in the market,
Iron, Zn content are more, easily scaling loss occur, and texture material is crisp, easy fracture in melting；And silicone content is more, fusing point is low, tensile strength
Requirement is not reached.In order to meet people it is higher and higher to automotive hub performance requirement, how to improve aluminium alloy wheel hub intensity,
Hardness and plasticity etc. also become the new challenge of aluminium alloy wheel hub exploitation.
The production of aluminum current alloy cast product uses low-pressure casting process, and low pressure casting has that die cost is low, the life-span
Long the advantages of, general technology flow is：Aluminium bar is melted into aluminium liquid on heat-preserving container first；Then it is passed through dry compressed gas
Body, makes the aluminium liquid of thawing enter under low pressure in mold cavity, and full of die cavity；Finally etc. by casting top after aluminium liquid coagulation forming
Go out.But low pressure casting production casting hardness it is low, compactness is poor, tensile strength is small and elongation percentage it is low be also the obvious of low pressure casting
Shortcoming.
CN105364424A discloses a kind of processing method of aluminium alloy wheel hub, and this method is subtracted by changing al alloy component
Few magnesium, iron, the content of silicon simultaneously increase the content of copper, although this method has certain reinforcement to tensile strength, can reduce aluminium
The hardness of alloy wheel hub, and increase the probability of casting process medium casting hot tearing.
Therefore, this area still needs to a kind of to improve the aluminum alloy wheel of aluminium alloy wheel hub hardness, tensile strength and elongation percentage
The casting technique of hub.
The content of the invention
It is an object of the invention to the defect for overcoming in existing aluminium alloy wheel hub manufacturing process, there is provided a kind of aluminum alloy wheel
The low-pressure casting process of hub, the casting technique can effectively improve the property such as hardness, tensile strength and elongation percentage of aluminium alloy wheel hub
Energy.
The present inventor is had found by studying, and aluminium alloy can be effectively improved by the content for improving Magnesium in Aluminum Alloys
The mechanical property of wheel hub, and overcome aluminium alloy content of magnesium to cross by the low-pressure casting process of " insulation-differentiation cool down " to be higher by
Existing fills imperfect type, shrinkage cavity, hot tearing and the strong defect that contracts so that dense structure, so as to significantly improve the mechanics of aluminium alloy castings
Performance.
To achieve these goals, the present invention provides a kind of low-pressure casting process of aluminium alloy wheel hub, wherein, low pressure casting
Technique comprises the following steps：
1) aluminum alloy materials progress melting is obtained into aluminium liquid, the percentage by weight of aluminium liquid Main Ingredients and Appearance is Si 6.8~7.2,
Mg 4.5~5, Ti 0.1~0.15, the Al of Fe 0.05~0.1 and surplus, the temperature of the melting is 800~950 DEG C；
2) mould is preheated to 500 DEG C, and is incubated 0.5 hour；
3) by step 1) aluminium liquid start to come out of the stove at 720~730 DEG C, and through high-purity nitrogen degasification 15 minutes, Zhi Houzhuan
Enter 670~695 DEG C of low pressure casting machine holding furnace and be incubated 1 hour；0.04~0.06Mpa aluminium liquids are forced into be risen into stalk
Liquid, the liter liquid time is 5~10s；It is forced into 0.08~0.1Mpa and is full of mold cavity to aluminium liquid, then adjusts pressure to 0.06
~0.07Mpa carries out pressurize, and the dwell time is 200~300s.
In the present invention, it is preferred in the case of, in step 1) in, the temperature of the melting is 850~900 DEG C.Obtain Mg
The higher aluminium alloy of content, can use the conventional method of this area, and for example adding magnesium powder using commercially available aluminium alloy is melted
Refining.
In the present invention, it is preferred to, in step 3) in, it is transferred to 680 DEG C of low pressure casting machine holding furnace and is incubated 1 hour.Insulation
So that aluminium alloy aluminium liquid is more uniform, ensure that cast properties are balanced.
Preferably, in step 3) in, it is forced into 0.04Mpa aluminium liquids and carries out rising liquid into stalk；It is forced into 0.09Mpa extremely
Aluminium liquid is full of mold cavity；Pressure adjusts to 0.07Mpa and carries out pressurize.
In order that the common crystallization degree for obtaining aluminium alloy is more preferable, to improve under the mechanical property of aluminium alloy wheel hub, preferable case,
Low-pressure casting process also includes step 4)：Treat that aluminium liquid is full of mold cavity, the lower mould of mould is carried out with 1.5~2 DEG C/s speed
400 DEG C are cooled to, then 280 DEG C are cooled to again with 0.4~0.7 DEG C/s speed, then be air-cooled to room temperature；The side mould of mould with
0.8~1.2 DEG C/s speed is cooled to 410 DEG C, is then cooled to 300 DEG C with 0.5~0.7 DEG C/s speed, then be air-cooled to room
Temperature；The upper mould of mould is cooled to 420 DEG C with 0.6~0.8 DEG C/s speed, is then cooled to 0.3~0.5 DEG C/s speed
300 DEG C, then it is air-cooled to room temperature.In step 4) in the temperature spot that is previously mentioned all referring to mould surface temperature, the temperature can between
It is reversed the problem of reflect casting.Carrying out different coolings using above-mentioned cooling means different parts causes whole casting integrally reaches homogeneous
Effect.Above-mentioned cooling means is cooperated with above-mentioned pressure maintaining period so that casting hardness, tensile strength and elongation percentage are effectively carried
While high, dense structure, and be not in fill imperfect type, shrinkage cavity, hot tearing and the defect such as strong that contracts.Mould in the present invention
" upper mould ", " side mould ", " lower mould " are the description commonly used in the low pressure casting of this area, enter the direction of mould from stalk with aluminium liquid
For " on ".
In the present invention, the method for above-mentioned cooling can be to apply cooling medium, the cooling to the corresponding outside of mould
Medium is compressed air." air cooling " refers to natural cooling in atmosphere.
It is general in current industry to be gone bad using Sr for aluminium alloy, this be due to Sr effects eutectiferous to Al-Si compared with
It is good, eutectic structure can be made in threadiness, and without using Sr in the present invention, and take adjustment low-pressure casting process to carry out raising casting
Mechanical property, while the presence for avoiding Sr promotes aluminium alloy air-breathing, pin hole tendentiousness is big, under going bad rear aluminium liquid mobility
Drop.
Compared with prior art, the advantage of the low-pressure casting process of aluminium alloy wheel hub of the invention is shown：1st, by this
What aluminium alloy wheel hub hardness, tensile strength and the elongation percentage that the technique of invention is obtained were effectively improved；2nd, aluminium alloy wheel hub will not go out
The defects such as imperfect type, shrinkage cavity, hot tearing and draw are now filled, finished product excellent rate is effectively increased.
Embodiment
Below in conjunction with specific embodiment, the present invention is expanded on further.But these embodiments be only limitted to explanation the present invention without
It is the further restriction to protection scope of the present invention.Experiment is raw materials used to be commercially available.
Embodiment 1
The low-pressure casting process of aluminium alloy wheel hub, comprises the following steps：
1) aluminum alloy materials progress melting is obtained into aluminium liquid, the percentage by weight of aluminium liquid Main Ingredients and Appearance is Si 7.1, Mg
4.9th, Ti 0.13, Fe 0.05 and surplus Al, the temperature of the melting is 850 DEG C；
2) mould is preheated to 500 DEG C, and is incubated 0.5 hour；
3) by step 1) aluminium liquid start to come out of the stove at 730 DEG C, and through high-purity nitrogen degasification 15 minutes, low pressure is transferred to afterwards
680 DEG C of casting machine holding furnace is incubated 1 hour；Be forced into 0.04Mpa aluminium liquids into stalk carry out rise liquid, rise the liquid time be 5~
10s；It is forced into 0.09Mpa and is full of mold cavity to aluminium liquid, then pressure is adjusted to 0.07Mpa and carries out pressurize, dwell time
For 280s.
4)：Treat that aluminium liquid is full of mold cavity, the lower mould of mould carries out being cooled to 400 DEG C with 2 DEG C/s speed, then again with
0.4 DEG C/s speed is cooled to 280 DEG C, then is air-cooled to room temperature；The side mould of mould is cooled to 410 DEG C with 1 DEG C/s speed, then
300 DEG C are cooled to 0.7 DEG C/s speed, then is air-cooled to room temperature；The upper mould of mould is cooled to 420 DEG C with 0.8 DEG C/s speed,
Then 300 DEG C are cooled to 0.3 DEG C/s speed, then are air-cooled to room temperature.The method of cooling is to apply to the corresponding outside of mould
Compressed air.
After above method pressurize terminates, it is cooled to room temperature and can be stripped and obtain aluminium alloy wheel hub A1, same batch carries out ten
Secondary experiment.
Embodiment 2
The low-pressure casting process of aluminium alloy wheel hub, comprises the following steps：
1) aluminum alloy materials progress melting is obtained into aluminium liquid, the percentage by weight of aluminium liquid Main Ingredients and Appearance is Si 6.8, Mg
4.5th, Ti 0.15, Fe 0.08 and surplus Al, the temperature of the melting is 900 DEG C；
2) mould is preheated to 500 DEG C, and is incubated 0.5 hour；
3) by step 1) aluminium liquid start to come out of the stove at 730 DEG C, and through high-purity nitrogen degasification 15 minutes, low pressure is transferred to afterwards
670 DEG C of casting machine holding furnace is incubated 1 hour；Be forced into 0.06Mpa aluminium liquids into stalk carry out rise liquid, rise the liquid time be 5~
10s；It is forced into 0.1Mpa and is full of mold cavity to aluminium liquid, then pressure is adjusted to 0.06Mpa and carries out pressurize, the dwell time is
300s。
4)：Treat that aluminium liquid is full of mold cavity, the lower mould of mould carries out being cooled to 400 DEG C, Ran Houzai with 1.5 DEG C/s speed
280 DEG C are cooled to 0.7 DEG C/s speed, then is air-cooled to room temperature；The side mould of mould is cooled to 410 DEG C with 1.2 DEG C/s speed,
Then 300 DEG C are cooled to 0.5 DEG C/s speed, then are air-cooled to room temperature；The upper mould of mould is cooled to 0.8 DEG C/s speed
420 DEG C, 300 DEG C then are cooled to 0.4 DEG C/s speed, then be air-cooled to room temperature.The method of cooling is outer accordingly to mould
Face applies compressed air.
After above method pressurize terminates, it is cooled to room temperature and can be stripped and obtain aluminium alloy wheel hub A2, same batch carries out ten
Secondary experiment.
Embodiment 3
The low-pressure casting process of aluminium alloy wheel hub, comprises the following steps：
1) aluminum alloy materials progress melting is obtained into aluminium liquid, the percentage by weight of aluminium liquid Main Ingredients and Appearance is Si 7, Mg 4.5,
Ti 0.14, Fe 0.07 and surplus Al, the temperature of the melting is 900 DEG C；
2) mould is preheated to 500 DEG C, and is incubated 0.5 hour；
3) by step 1) aluminium liquid start to come out of the stove at 720 DEG C, and through high-purity nitrogen degasification 15 minutes, low pressure is transferred to afterwards
695 DEG C of casting machine holding furnace is incubated 1 hour；Be forced into 0.05Mpa aluminium liquids into stalk carry out rise liquid, rise the liquid time be 5~
10s；It is forced into 0.1Mpa and is full of mold cavity to aluminium liquid, then pressure is adjusted to 0.06Mpa and carries out pressurize, the dwell time is
280s。
4)：Treat that aluminium liquid is full of mold cavity, the lower mould of mould carries out being cooled to 400 DEG C, Ran Houzai with 1.5 DEG C/s speed
280 DEG C are cooled to 0.6 DEG C/s speed, then is air-cooled to room temperature；The side mould of mould is cooled to 410 DEG C with 0.8 DEG C/s speed,
Then 300 DEG C are cooled to 0.5 DEG C/s speed, then are air-cooled to room temperature；The upper mould of mould is cooled to 0.6 DEG C/s speed
420 DEG C, 300 DEG C then are cooled to 0.5 DEG C/s speed, then be air-cooled to room temperature.The method of cooling is outer accordingly to mould
Face applies compressed air.
After above method pressurize terminates, it is cooled to room temperature and can be stripped and obtain aluminium alloy wheel hub A3, same batch carries out ten
Secondary experiment.
Embodiment 4
The low-pressure casting process of aluminium alloy wheel hub in such as embodiment 1, except that, without step 4), obtain aluminium
Alloy wheel hub A4, it is same to carry out ten experiments.
Embodiment 5
The low-pressure casting process of aluminium alloy wheel hub in such as embodiment 1, except that, in step 4) in, treat that aluminium liquid is filled
Full mold cavity, lower mould, Bian Mo, upper mould are cooled down with 2 DEG C/s speed.Aluminium alloy wheel hub A5 is obtained, it is same to carry out ten times
Experiment.
Embodiment 6
The low-pressure casting process of aluminium alloy wheel hub in such as embodiment 1, except that, in step 4) in, treat that aluminium liquid is filled
Full mold cavity, lower mould with 2 DEG C/s speed be cooled to room temperature, side mould with 1 DEG C/s speed be cooled to room temperature, upper mould with
0.8 DEG C/s speed is cooled down.Aluminium alloy wheel hub A6 is obtained, it is same to carry out ten experiments.
Comparative example 1
The low-pressure casting process of aluminium alloy wheel hub in such as embodiment 4, except that, the weight hundred of aluminium liquid Main Ingredients and Appearance
Divide than the Al for Si 7.0, Mg 0.31, Ti 0.10, Fe 0.05 and surplus, obtain aluminium alloy wheel hub D1, equally carry out ten
Secondary experiment.
Comparative example 2
The low-pressure casting process of aluminium alloy wheel hub in such as embodiment 1, except that, fusion process is additionally added aluminium-strontium
Alloy (Al-Sr10, Sr content are 9.0-11.0%) is such that the content of Sr in aluminium liquid is 0.016%, obtains aluminium alloy wheel hub D2,
It is same to carry out ten experiments.
Comparative example 3
Such as the low-pressure casting process of the aluminium alloy wheel hub in embodiment 1, except that, step 3) in dwell pressure be
0.09Mpa, obtains aluminium alloy wheel hub D2, same to carry out ten experiments.
Comparative example 4
Such as the low-pressure casting process of the aluminium alloy wheel hub in embodiment 1, except that, step 3) in be forced into 0.1Mpa
Aluminium liquid enters stalk and carries out rising liquid, and the liter liquid time is 5~10s；Keep pressure 0.1Mpa to aluminium liquid be full of mold cavity, then
Continue to keep pressure to carry out pressurize, the dwell time is 280s.Aluminium alloy wheel hub D3 is obtained, it is same to carry out ten experiments.
Test case
Aluminium alloy wheel hub obtained by embodiment 1-6 and comparative example 1-4 is subjected to visual inspection and performance test, tool
Body result is as shown in table 1.
Table 1
In table 1, data are the average value of same ten groups of data of batch, and shrinkage cavity and slight crack (being more than or equal to 2mm) pass through
Range estimation is carried out；The detection of Brinell hardness, tensile strength and elongation percentage is carried out according to GB/T 23301-2009.
As can be seen from the above table, the aluminium alloy wheel hub made by the low-pressure casting process of the aluminium alloy wheel hub of the present invention has
There are high rigidity, tensile strength strong and the good characteristic of elongation percentage high tenacity.And the technique manufacture aluminium alloy wheel hub it is imperfect,
The defect situations such as shrinkage cavity, hot tearing and draw are few, substantially increase yield rate.
Claims (7)
1. the low-pressure casting process of aluminium alloy wheel hub, it is characterised in that low-pressure casting process comprises the following steps：
1）Aluminum alloy materials progress melting is obtained into aluminium liquid, the percentage by weight of aluminium liquid Main Ingredients and Appearance is Si 6.8 ~ 7.2, Mg
4.5 ~ 5, Ti 0.1 ~ 0.15, Fe 0.05 ~ 0.1 and surplus Al, the temperature of the melting is 800 ~ 950 DEG C；
2）Mould is preheated to 500 DEG C, and is incubated 0.5 hour；
3）By step 1）Aluminium liquid start to come out of the stove at 720 ~ 730 DEG C, and through high-purity nitrogen degasification 15 minutes, low pressure is transferred to afterwards
670 ~ 695 DEG C of casting machine holding furnace is incubated 1 hour；It is forced into 0.04 ~ 0.06MPa aluminium liquids to carry out rising liquid into stalk, rises liquid
Time is 5 ~ 10s；It is forced into 0.08 ~ 0.1MPa and is full of mold cavity to aluminium liquid, then adjusts pressure to 0.06 ~ 0.07MPa
Pressurize is carried out, the dwell time is 200 ~ 300s.
2. the low-pressure casting process of aluminium alloy wheel hub according to claim 1, it is characterised in that in step 3）In, it is transferred to
680 DEG C of low pressure casting machine holding furnace is incubated 1 hour.
3. the low-pressure casting process of aluminium alloy wheel hub according to claim 1, it is characterised in that in step 3）In, pressurization
Enter stalk to 0.04MPa aluminium liquids to carry out rising liquid.
4. the low-pressure casting process of aluminium alloy wheel hub according to claim 1, it is characterised in that in step 3）In, pressurization
To 0.09MPa to aluminium liquid full of mold cavity.
5. the low-pressure casting process of aluminium alloy wheel hub according to claim 1, it is characterised in that in step 3）In, pressure
Adjust to 0.07MPa and carry out pressurize.
6. the low-pressure casting process of aluminium alloy wheel hub according to claim 1, it is characterised in that low-pressure casting process is also wrapped
Include step 4）：Treat that aluminium liquid is full of mold cavity, the lower mould of mould carries out being cooled to 400 DEG C, Ran Houzai with 1.5 ~ 2 DEG C/s speed
280 DEG C are cooled to 0.4 ~ 0.7 DEG C/s speed, then is air-cooled to room temperature；The side mould of mould is cooled down with 0.8 ~ 1.2 DEG C/s speed
To 410 DEG C, 300 DEG C then are cooled to 0.5 ~ 0.7 DEG C/s speed, then be air-cooled to room temperature；The upper mould of mould is with 0.6 ~ 0.8
DEG C/s speed is cooled to 420 DEG C, is then cooled to 300 DEG C with 0.3 ~ 0.5 DEG C/s speed, then be air-cooled to room temperature.
7. the low-pressure casting process of the aluminium alloy wheel hub according to claim any one of 1-6, it is characterised in that the side of cooling
Method is to apply cooling medium to the corresponding outside of mould, and the cooling medium is compressed air.
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| CN107626904A (en) * | 2017-09-30 | 2018-01-26 | 徐州九鼎机电总厂 | A kind of processing technology of wheel spoke |
| CN107828992A (en) * | 2017-11-14 | 2018-03-23 | 安徽福斯特汽车部件有限公司 | A kind of preparation method of the aluminium alloy wheel hub of low scrappage |
| CN107900312A (en) * | 2017-11-23 | 2018-04-13 | 张永 | A kind of low-pressure casting process of aluminium alloy wheel hub |
| CN109954867A (en) * | 2017-12-26 | 2019-07-02 | 严凤 | Automotive hub processing method |
| CN110181024B (en) * | 2019-07-09 | 2021-09-24 | 佛山市南海奔达模具有限公司 | Low-pressure casting process of hub |
| CN111676404B (en) * | 2020-07-07 | 2021-11-09 | 广东鸿特精密技术（台山）有限公司 | Improved die casting forming method |
| CN113909454A (en) * | 2021-10-09 | 2022-01-11 | 大冶市东晟机械制造有限公司 | Low-pressure casting process for rear hub of alloy automobile |
| CN118477981B (en) * | 2024-05-10 | 2024-10-29 | 山东金马汽车装备科技有限公司 | Low-cost thick-wall knuckle low-pressure casting method |
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| JP3037926B2 (en) * | 1998-02-26 | 2000-05-08 | 日立金属株式会社 | Aluminum alloy for aluminum wheel casting |
| JP2003170263A (en) * | 2001-12-10 | 2003-06-17 | Hitachi Metals Ltd | Method for casting vehicle wheel under low pressure |
| CN101439396B (en) * | 2008-12-10 | 2010-07-28 | 中国兵器工业第五二研究所 | Counter-pressure casting process for casting parts of door cover |
| CN101844218B (en) * | 2009-03-28 | 2012-12-26 | 王宏波 | Low pressure casting process for aluminum alloy cylinder part |
| CN102366828B (en) * | 2011-10-10 | 2016-12-21 | 陈丹红 | A kind of low-pressure casting method of aluminium alloy automobile hub |
| CN104741575A (en) * | 2013-12-25 | 2015-07-01 | 青岛玉光精铸厂 | Low-pressure casting and manufacturing technology of aluminum alloy cylinder part |
| CN105364424A (en) * | 2015-12-15 | 2016-03-02 | 天津立中车轮有限公司 | Processing method of an aluminum alloy hub |
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