CN107815569B - A kind of spindle and preparation method thereof - Google Patents
A kind of spindle and preparation method thereof Download PDFInfo
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- CN107815569B CN107815569B CN201710902515.4A CN201710902515A CN107815569B CN 107815569 B CN107815569 B CN 107815569B CN 201710902515 A CN201710902515 A CN 201710902515A CN 107815569 B CN107815569 B CN 107815569B
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- 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
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D7/00—Steering linkage; Stub axles or their mountings
- B62D7/18—Steering knuckles; King pins
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0005—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with at least one oxide and at least one of carbides, nitrides, borides or silicides as the main non-metallic constituents
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
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- Combustion & Propulsion (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
The present invention relates to a kind of spindles and preparation method thereof, belong to automobile technical field.Spindle of the invention is made of aluminium alloy, and the aluminium alloy includes the following components'mass percentage: 0.6~2.0%Si, 2.0~2.6%Cu, 0~0.05%Mn, 1.8~2.3%Mg, 0.3~0.6%Cr, 2.3~4.6%Zn, 0.06~0.15%Ti, 0.6~0.85Zr, 0.05~0.12%Te, 0~0.05Fe, 5.5~7.5% ceramic powders, 0.12~0.25%RE, surplus Al.Spindle produced by the present invention has the characteristics that lightweight, good mechanical performance.
Description
Technical field
The invention belongs to automobile technical field, it is related to a kind of spindle and preparation method thereof.
Background technique
Knuckle is one of the important part in steering axle of automobile, function is to transmit simultaneously because shape reason is also known as " goat's horn "
Automobile front load is born, support and front-wheel is driven to rotate around stub and make motor turning, makes vehicle steadily traveling and sensitive biography
Driving direction is passed, because the front shock-proof device machine of vehicle is mounted on knuckle, under vehicle driving state, knuckle is also acted as
The effect for bearing automobile front load, subjects shock loading from multiple directions and changeable, therefore, has very high intensity
It is required that.Knuckle is connected by bolt, bushing with vehicle body, and other than center will be connect with jackshaft, knuckle is still braked
The installation pedestal of clamp and shock-absorbing machine.The design of genuine knuckle is related to kingpin inclination, front-wheel camber and toe-in angle
Deng with Vehicle handling closely bound up data.In addition to these, the company of various swing arms and connecting rod in knuckle or suspension
The component connect.Knuckle mostly uses solid forging or the method for seperated forging to be manufactured at present.The method of solid forging
It can satisfy the rigors of vehicle under steam, however, the rough forging of whole knuckle, manufacturing process is complicated, is processed into
This height, especially knuckle spindle are entity state, which had not only led to the increase of weight but also influenced the transfer of heat treatment quenching and tempering process
The quality quenched to nodal axisn core；And the waste of solid forging mode blank material is big, and material cannot be fully utilized.It is seperated
The knuckle of forging is made of frame and main shaft, and for the two by being suppressed into one after finishing, the connection of sections bracing with connective positional is strong
The size that degree depends on the magnitude of interference of main shaft indentation frame cooperates depth, but the presence of the structure type can be to vehicle driving
Very big security risk is brought in the process, is used so the knuckle of the structure type is few on the market at present.In addition, seperated
Formula knuckle needs for main shaft to be pressed into the depth in frame 1/4 or 1/5, and the overlapping of connecting portion, which equally increases, to be turned
To section weight.In addition, frame and main shaft need quite high precision for processing in components process of manufacture.In view of upper
Defect is stated, also has and cast iron is used to be made with the technique of casting on flat, but the production method is first is that production efficiency is relatively low, generally
Iron liquid casting speed slowly more to be needed 10 seconds or more or even 20 seconds or more to complete to be poured；Second is that since poring rate is slow, iron
Liquid can cool down comparatively fast, cause the place of the intracavitary filling iron liquid of type not enrich, being easy to appear shrinkage porosite, shrinkage cavity etc. leads to rate of wasted casting product
Relatively high, production cost is bigger；Third is that due to there are casting flaws such as shrinkage porosite, shrinkage cavities, the mechanical performance that will cause casting is owed
It is good, it is difficult to meet requirement of the spindle to car speed, there is also certain security risks.
Summary of the invention
It is excellent the purpose of the present invention is in view of the above-mentioned problems existing in the prior art, proposing a kind of lightweight, mechanical property
Good spindle.
Object of the invention can be realized by the following technical scheme:
A kind of spindle, the spindle are made of aluminium alloy, and the aluminium alloy includes following quality percentage
The component of ratio: 0.6~2.0%Si, 2.0~2.6%Cu, 0~0.05%Mn, 1.8~2.3%Mg, 0.3~0.6%Cr, 2.3
~4.6%Zn, 0.06~0.15%Ti, 0.6~0.85Zr, 0.05~0.12%Te, 0~0.05Fe, 5.5~7.5% ceramics
Powder, 0.12~0.25%RE, surplus Al.
The present invention improves the content of Si, Zr and Ti on the basis of 7055 aluminium alloy, reduces the content of Zn.And add
Add Te, ceramic powder and RE, significantly improves the intensity, toughness and impact resistance of pull rod connecting tube.Wherein, it is fitted in the present invention
The Si and Al of amount can form Al+Si eutectic liquid phase, help to improve aluminium alloy casting fluidity；Mg and matrix Al Element generation are big
Measure Mg5Al and Mg5Al8Phase can make Mg by heat treatment5Al and Mg5Al8It is mutually dissolved into alloy matrix aluminum α phase, to improve aluminium
The ambient temperature mechanical properties of alloy, but excessive Mg5Al and Mg5Al8Whole solid solutions are mutually difficult to realize, alloy matrix aluminum is gathered in
Between crystal boundary, the overall mechanical properties of aluminium alloy can be reduced；Mg can also form Mg with Si2Si hardening constituent forms hardening constituent with Zn
MgZn2, it can be remarkably reinforced the tensile strength and yield strength of aluminium alloy, but excessive Mg2Si phase will cause the crisp of aluminium alloy
Property and the toughness for reducing aluminium alloy, excessive MgZn2Xiang Zehui reduces the temperature flowing of aluminium alloy, to reduce aluminium alloy
Pourability.Suitable Mn can form Hard Inclusion phase in aluminium alloy, to improve the wear-resisting property of aluminium alloy, reduce friction system
Number improves the heat resistance of matrix, but excessive Mn is easy to form excessive Hard Inclusion with other elements, reduces the mechanics of aluminium alloy
Performance and thermal conductivity.The present invention, which improves the content of Zr and Ti, Zr and Ti, can hinder Mg in aluminium alloy by synergistic effect2Si
And MgZn2The recrystal grain of phase is grown up, and is prevented the two from forming coarse crystal grain and is caused tearing to act on alloy matrix aluminum.This hair
The addition of bright middle Te can accelerate age-hardening, improve the corrosion resistance of aluminium alloy, but excessive Te will lead to casting group
Non-equilibrium crystalline phase increases in knitting, and reduces the degree of supersaturation of aluminium alloy, is unfavorable for the raising of intensity of aluminum alloy.It is ceramic in the present invention
The addition of powder can significantly improve the intensity and shock resistance of aluminium alloy.The appropriate rare earth element added in the present invention can have
Effect refinement crystal grain, improves the microstructure form of aluminium alloy, improves casting fluidity, intensity and the plasticity of aluminium alloy.
Preferably, the ceramic powder includes AlN powder and nanometer Al2O3Powder.
The present invention adds AlN powder and nanometer Al simultaneously in aluminium alloy2O3The wetability of powder, AlN and alloy matrix aluminum is good,
There is preferable compatibility with aluminium alloy, micro-deformation, slack interfacial stress, to improve can be generated during stretching
The intensity and shock resistance of aluminium alloy.But AlN limited strength, therefore the present invention is aided with the nanometer Al with higher intensity2O3
Powder, the different size of the two form gradation relationship and pass through AlN and nanometer Al when bearing greater impact power2O3Buffering step by step
Impact force dispersion is preferably minimized, to enable aluminum alloy to be able to bear biggish impact force by decaying.Nanometer Al2O3Addition can also
The excessive growth for effectively inhibiting AlN crystal grain, improves the consistency of aluminium alloy.
Preferably, the ceramic powder includes accounting for the AlN powder of aluminium alloy gross mass 3.3~4.6% and accounting for the total matter of aluminium alloy
The nanometer Al of amount 2.2~2.9%2O3Powder.
The present invention is by AlN powder and nanometer Al2O3The additive amount of powder and the ratio of the two control within the above range, work as nanometer
Al2O3When the additive amount of powder gradually increases, the bending strength of aluminium alloy is dramatically increased, but works as nanometer Al2O3The adding proportion mistake of powder
Gao Shi, the bending strength of aluminium alloy start to reduce.
Preferably, the partial size of the AlN powder is 130~500nm, nanometer Al2O3The partial size of powder is 30~80nm.
The partial size of AlN powder is too small in the present invention, and the characteristic of rigid particle is too strong, is difficult to produce during Aluminum alloy tensile
Change shape, is unfavorable for the raising of aluminium alloy shock resistance, and partial size crosses conference and causes tearing to act on alloy matrix aluminum, reduces aluminium
The mechanical property of alloy.Nanometer Al2O3The partial size of powder within the above range, can play Grain refinement in aluminium alloy, and
And rigidity characteristic is stronger, partial size is excessive not to have Grain refinement.
Preferably, the RE is one of Pr, Gd, Er or a variety of mixed nano-powders.
Preferably, the RE is the composite nano powder of Pr, Gd, Er, the quality of described Pr, Gd, Er in aluminium alloy
Percentage is respectively 0.03~0.06%, 0.05~0.10%, 0.04~0.09%.
The present invention passes through the component and mass percent of reasonable compatibility RE, has effectively refined the crystal grain of aluminium alloy, especially
The size for reducing the AlSiMgFe strip and granular compound precipitated phase in aluminum alloy organization makes it that lesser ruler be presented
It is very little, it prevents its biggish size from forming the effect of isolating to alloy matrix aluminum, effectively prevents the damage of Si and Fe to aluminium alloy and make
With.When RE total content and ratio within the above range when, AlSiMgFe strip and granular compound precipitate size it is smaller and
It is evenly distributed, when RE total content is excessively high, strip precipitate size becomes larger, shape becomes irregular, so that structural homogenity
Decline, to increase the effect of isolating to matrix.
Another object of the present invention is to provide a kind of preparation method of spindle, the preparation method include with
Lower step,
S1, the raw metal of aluminium alloy is heated under inert gas protection melting be alloy molten solution, be added ceramic powder and
RE is stirred evenly, and 3~5min is kept the temperature under the Ultrasonic Conditions of 400~500w power；
S2, by alloy molten solution, casting and forming is casting in low-pressure die casting plant, is cooled to room temperature, is then heat-treated
Up to spindle.
The present invention carries out the preparation of spindle using low pressure casting method, and casting good moldability is clear-cut, surface light
Clean, dimensional accuracy is high；Volume gas and slag inclusion can be effectively reduced by carrying out melting under inert gas protection, prevent oxidized aluminum alloy,
Ultrasonic wave effect can be improved stirring degree, the cavitation of ultrasonic wave and shock effect can effectively reduce inside it there may be and folder
Miscellaneous bubble, and be conducive to the floating of slag inclusion, consequently facilitating removing.
Preferably, the inner wall of the stalk of the step S2 mesolow Casting Equipment has waveform smooth surface.
Low-pressure die casting plant of the present invention uses the stalk with waveform smooth surface, can effectively buffer a liter liquid process
The pressure of middle alloy molten solution avoids the injection that may cause from splashing, disorder flowing, thus keep cavity filling process more steady, it can
The cavity filling process of held stationary under faster filling velocity.
Preferably, casting and forming includes rising liquid to fill type stage and solidification stages in the step S2, described liter of liquid fills type
Stage, which applies alloy molten solution liquid level, rises hydraulic coupling, and guarantee filling velocity is 45~50mm/s, after liter liquid fills type, in a liter liquid
The type that fills for increasing by 0.008~0.010MPa to alloy molten solution liquid level on the basis of pressure is pressurized, and the time is 20~50s, described solidifying
Gu the stage applies the pressure of 50~100MPa, and 100~120min of pressure maintaining to casting.
The present invention uses specific stalk, so as to use higher filling velocity, improves casting efficiency；The present invention
Increase certain numerical value on the basis of mold filling pressure after liter liquid fills type fills type pressurization value, guarantees that liquid level does not land the beginning
It while resting on die top eventually, solidifies casting at lower pressures, improves the smoothness on aluminium alloy castings surface
And consistency, reduce aluminium alloy internal structural flaw.Solidification stages apply the group that certain pressure improves casting to casting
Consistency is knitted, loose, shrinkage cavity defect generation is reduced, to improve the mechanical property of casting, and has effectively organized casting
The precipitation of middle gas.
Preferably, the heat treatment process is, 430~460 DEG C are first warming up to, 1.5~2.5h is kept the temperature, then heats to
520~580 DEG C, 2~3h is kept the temperature, then room temperature is down to quickly with the speed of 35~50 DEG C/min.
The present invention effectively can be discharged stress by aluminium alloy, be improved aluminium alloy capability, quickly by the way of Fractional Heat-treatment
The mode of cooling effectively prevents the excessive growth of crystal during heat treatment.
Preferably, applying the pulse inert gas of 50~150MPa to casting while heat treatment in the step S2
Pressure, interpulse period are 5~20s.
The present invention applies pulse inert gas pressure to spindle in heat treatment, being capable of effective refining aluminum alloy crystalline substance
Grain, the defects of eliminating aluminium alloy internal segregation, be mingled with, to improve the overall performance of aluminium alloy.
Compared with prior art, the invention has the following advantages:
Spindle is prepared using aluminium alloy, significantly reduces the quality of spindle；It is closed by reasonable compatibility aluminium
The component of gold, significantly improves the intensity, toughness and impact resistance of spindle；And pass through the preparation work of optimization aluminium alloy
Skill obtains the spindle of function admirable.
Specific embodiment
The following is specific embodiments of the present invention, and technical scheme of the present invention will be further described, but the present invention is simultaneously
It is not limited to these embodiments.
Examples 1 to 5
Spindle is made of aluminium alloy in Examples 1 to 5, and aluminium alloy includes the group of following mass percentage content
Point: 0.6~2.0%Si, 2.0~2.6%Cu, 0~0.05%Mn, 1.8~2.3%Mg, 0.3~0.6%Cr, 2.3~4.6%
Zn, 0.06~0.15%Ti, 0.6~0.85Zr, 0.05~0.12%Te, 0~0.05Fe, 5.5~7.5% ceramic powders, 0.12
~0.25%RE, surplus Al.
Ceramic powder includes accounting for the AlN powder of aluminium alloy gross mass 3.3~4.6% and accounting for aluminium alloy gross mass 2.2~2.9%
Nanometer Al2O3Powder.The partial size of AlN powder is 130~500nm, nanometer Al2O3The partial size of powder is 30~80nm.
RE is one of Pr, Gd, Er or a variety of mixed nano-powders.Further preferably the compound of Pr, Gd, Er is received
Rice flour body, the mass percent of described Pr, Gd, Er in aluminium alloy are respectively 0.03~0.06%, 0.05~0.10%, 0.04
~0.09%.
The component and other parameters of aluminium alloy are as shown in Table 1 and Table 2 in Examples 1 to 5.
Table 1: the component and its mass percent of aluminium alloy in Examples 1 to 5
Table 2: in Examples 1 to 5 in aluminium alloy AlN microballoon and RE parameter
Embodiment 6
The preparation method of spindle includes the following steps in the present embodiment,
(1), according to the raw material and proportion preparation raw material in embodiment 3, under inert gas protection by aluminium alloy stock
Heating melting is alloy molten solution, and ceramic powder is added and RE is stirred evenly, keeps the temperature 3min under 400w Ultrasonic Conditions；
(2), by alloy molten solution use the method for low pressure casting in low-pressure die casting plant casting and forming for casting, low pressure casting
The inner wall of the stalk of manufacturing apparatus has waveform smooth surface, is then cooled to room temperature casting, is then heat-treated i.e.
Spindle is obtained,
Casting and forming includes rising liquid to fill type stage and solidification stages, rises liquid and fills the type stage to alloy molten solution liquid level application liter liquid
Pressure, guarantee filling velocity are 45mm/s, are risen after liquid fills type, are increased on the basis of liter hydraulic coupling alloy molten solution liquid level
The type that fills of 0.008MPa is pressurized, and time 50s, solidification stages apply the pressure of 50MPa, and pressure maintaining 120min to casting,
Heat treatment process is first to be warming up to 430 DEG C, keeps the temperature 2.5h, then heats to 520 DEG C, keeps the temperature 3h, then with 35 DEG C/
The speed of min is quickly down to room temperature, while heat treatment, applies the pulse inert gas pressure of 50MPa, pulse spacing to casting
Time is 20s.
Embodiment 7
The preparation method of spindle includes the following steps in the present embodiment,
(1), according to the raw material and proportion preparation raw material in embodiment 3, under inert gas protection by aluminium alloy stock
Heating melting is alloy molten solution, and ceramic powder is added and RE is stirred evenly, keeps the temperature 4min under 450 Ultrasonic Conditions；
(2), by alloy molten solution use the method for low pressure casting in low-pressure die casting plant casting and forming for casting, low pressure casting
The inner wall of the stalk of manufacturing apparatus has waveform smooth surface, is then cooled to room temperature casting, is then heat-treated i.e.
Spindle is obtained,
Casting and forming includes rising liquid to fill type stage and solidification stages, rises liquid and fills the type stage to alloy molten solution liquid level application liter liquid
Pressure, guarantee filling velocity are 46mm/s, are risen after liquid fills type, are increased on the basis of liter hydraulic coupling alloy molten solution liquid level
The type that fills of 0.009MPa is pressurized, and time 35s, solidification stages apply the pressure of 70MPa, and pressure maintaining 110min to casting,
Heat treatment process is first to be warming up to 440 DEG C, keeps the temperature 2.0h, then heats to 540 DEG C, keeps the temperature 2.5h, then with 40
DEG C/speed of min is quickly down to room temperature, while heat treatment, apply the pulse inert gas pressure of 100MPa, pulse to casting
Interval time is 13s.
Embodiment 8
The preparation method of spindle includes the following steps in the present embodiment,
(1), according to the raw material and proportion preparation raw material in embodiment 3, under inert gas protection by aluminium alloy stock
Heating melting is alloy molten solution, and ceramic powder is added and RE is stirred evenly, keeps the temperature 4min under 460w Ultrasonic Conditions；
(2), by alloy molten solution use the method for low pressure casting in low-pressure die casting plant casting and forming for casting, low pressure casting
The inner wall of the stalk of manufacturing apparatus has waveform smooth surface, is then cooled to room temperature casting, is then heat-treated i.e.
Spindle is obtained,
Casting and forming includes rising liquid to fill type stage and solidification stages, rises liquid and fills the type stage to alloy molten solution liquid level application liter liquid
Pressure, guarantee filling velocity are 49mm/s, are risen after liquid fills type, are increased on the basis of liter hydraulic coupling alloy molten solution liquid level
The type that fills of 0.010MPa is pressurized, and time 30s, solidification stages apply the pressure of 80MPa, and pressure maintaining 110min to casting,
Heat treatment process is first to be warming up to 450 DEG C, keeps the temperature 2.0h, then heats to 560 DEG C, keeps the temperature 2.5h, then with 45
DEG C/speed of min is quickly down to room temperature, while heat treatment, apply the pulse inert gas pressure of 120MPa, pulse to casting
Interval time is 15s.
Embodiment 9
The preparation method of spindle includes the following steps in the present embodiment,
(1), according to the raw material and proportion preparation raw material in embodiment 3, under inert gas protection by aluminium alloy stock
Heating melting is alloy molten solution, and ceramic powder is added and RE is stirred evenly, keeps the temperature 5min under 500w Ultrasonic Conditions；
(2), by alloy molten solution use the method for low pressure casting in low-pressure die casting plant casting and forming for casting, low pressure casting
The inner wall of the stalk of manufacturing apparatus has waveform smooth surface, is then cooled to room temperature casting, is then heat-treated i.e.
Spindle is obtained,
Casting and forming includes rising liquid to fill type stage and solidification stages, rises liquid and fills the type stage to alloy molten solution liquid level application liter liquid
Pressure, guarantee filling velocity are 50mm/s, are risen after liquid fills type, are increased on the basis of liter hydraulic coupling alloy molten solution liquid level
The type that fills of 0.010MPa is pressurized, and time 20s, solidification stages apply the pressure of 100MPa, and pressure maintaining 100min to casting,
Heat treatment process is first to be warming up to 460 DEG C, keeps the temperature 1.5h, then heats to 580 DEG C, keeps the temperature 2h, then with 50 DEG C/
The speed of min is quickly down to room temperature, while heat treatment, applies the pulse inert gas pressure of 150MPa to casting, between pulse
It is 5s every the time.
Embodiment 10~13
Prepare raw material according to the raw material of embodiment 1,2,4,5 and proportion respectively, is carried out according to the preparation method of embodiment 8
The preparation of spindle.
Comparative example 1
Aluminium alloy is 7055 aluminium alloys, other same as Example 8.
Comparative example 2
AlN powder and nanometer Al are not added in aluminium alloy2O3Powder, it is other same as Example 8.
Comparative example 3
A nanometer Al is not added in aluminium alloy2O3Powder, it is other same as Example 8.
Comparative example 4
Spindle is prepared using the method that conventional low voltage is cast, it is other same as Example 8.
The performance of the spindle prepared in the embodiment of the present invention 6~13, comparative example 1~4 is compared, knot is compared
Fruit is as shown in table 3.
Table 3: the comparison of spindle performance in embodiment 6~15, comparative example 1~4
In conclusion the present invention passes through the raw material components of reasonable compatibility aluminium alloy, and pass through optimization preparation process and its ginseng
Light weight, the spindle of good mechanical performance is made in number.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (7)
1. a kind of spindle, which is characterized in that the spindle is made of aluminium alloy, and the aluminium alloy includes following
The component of mass percent: 0.6 ~ 2.0%Si, 2.0 ~ 2.6%Cu, 0 ~ 0.05%Mn, 1.8 ~ 2.3%Mg, 0.3 ~ 0.6%Cr, 2.3 ~
4.6%Zn, 0.06 ~ 0.15%Ti, 0.6 ~ 0.85%Zr, 0.05 ~ 0.12%Te, 0 ~ 0.05Fe, 5.5 ~ 7.5% ceramic powders, 0.12 ~
0.25%RE, surplus Al, the ceramic powder include accounting for the AlN powder of aluminium alloy gross mass 3.3 ~ 4.6% and accounting for aluminium alloy gross mass
2.2 ~ 2.9% nanometer Al2O3Powder, the partial size of the AlN powder are 130 ~ 500nm, nanometer Al2O3The partial size of powder is 30 ~ 80nm.
2. spindle according to claim 1, which is characterized in that the RE is one of Pr, Gd, Er or a variety of
Mixed nano-powder.
3. spindle according to claim 1 or 2, which is characterized in that the RE is the composite Nano of Pr, Gd, Er
Powder, the mass percent of described Pr, Gd, Er in aluminium alloy is respectively 0.03 ~ 0.06%, 0.05 ~ 0.10%, 0.04 ~
0.09%。
4. a kind of preparation method of the spindle as described in claim 1 ~ 3 any claim, which is characterized in that described
Preparation method includes the following steps,
S1, the raw metal of aluminium alloy is heated to melting for alloy molten solution under inert gas protection, ceramic powder is added and RE is stirred
It mixes uniformly, 3 ~ 5min is kept the temperature under the Ultrasonic Conditions of 400 ~ 500w power；
S2, by alloy molten solution, casting and forming is casting in low-pressure die casting plant, is cooled to room temperature, is then heat-treated to obtain the final product
Spindle.
5. the preparation method according to claim 4, which is characterized in that the stalk of the step S2 mesolow Casting Equipment
Inner wall have waveform smooth surface.
6. preparation method according to claim 5, which is characterized in that casting and forming includes rising liquid to fill type in the step S2
Stage and solidification stages, described liter of liquid fill the type stage to alloy molten solution liquid level apply rise a hydraulic coupling, guarantee filling velocity be 45 ~
50mm/s rises after liquid fills type, increases by 0.008 ~ 0.010MPa to alloy molten solution liquid level on the basis of liter hydraulic coupling and fills
Type pressurization, time are 20 ~ 50s, and the solidification stages apply the pressure of 50 ~ 100MPa, and 100 ~ 120min of pressure maintaining to casting.
7. the preparation method according to claim 4, which is characterized in that while heat treatment in the step S2, to automobile
Knuckle applies the pulse inert gas pressure of 50 ~ 150MPa, and interpulse period is 5 ~ 20s.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108672702A (en) * | 2018-05-21 | 2018-10-19 | 宁波市奇强精密冲件有限公司 | Damper knuckle support |
| CN111074180B (en) * | 2019-12-23 | 2021-04-09 | 宝胜（宁夏)线缆科技有限公司 | High-strength pressure-resistant aluminum alloy cast rod for heavy truck hub and preparation process thereof |
| CN111850364A (en) * | 2020-06-23 | 2020-10-30 | 青阳县光大铸造有限公司 | Light high-strength aluminum alloy material for automobile steering knuckle |
| CN116590554B (en) * | 2023-05-19 | 2024-01-12 | 盐城永鑫机械有限公司 | High-performance steering knuckle for vehicle |
| CN116987919A (en) * | 2023-09-22 | 2023-11-03 | 上海嘉朗实业南通智能科技有限公司 | Aluminum alloy die casting for new energy automobile battery shell and preparation method thereof |
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