CN106041016B - A kind of forming technology and mold of aluminium alloy car foot pedal - Google Patents
A kind of forming technology and mold of aluminium alloy car foot pedal Download PDFInfo
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- CN106041016B CN106041016B CN201610559467.9A CN201610559467A CN106041016B CN 106041016 B CN106041016 B CN 106041016B CN 201610559467 A CN201610559467 A CN 201610559467A CN 106041016 B CN106041016 B CN 106041016B
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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
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses the forming technologies and mold of a kind of aluminium alloy car foot pedal, its processing step includes the following: 1) prepared by melting: aluminium alloy ingots being put into melting furnace and carries out melting, gone bad after fusing to aluminium alloy, refining treatment, and carries out aluminium alloy degasification；2) casting forming: mold preheating prepares, and then type, casting solidification, die sinking pickup are filled in molding, casting, finally removes cinder ladle and cast gate, obtains foot pedal spray；3) after casting forming, foot pedal spray natural cooling: is placed on progress 12~15h of natural cooling under room temperature environment；4) ageing treatment: casting being put into heat-treatment furnace and carries out ageing treatment, and operating temperature is 165~195 DEG C, and soaking time is 3~5h.In addition, the present invention also provides a kind of ejection pore structures of foot pedal die casting, it is therefore prevented that thimble deforms in press casting procedure, guarantees that subsequent demoulding is smooth.
Description
Technical field
The present invention relates to die casting preparation technical field, especially a kind of forming technology for aluminium alloy car foot pedal
And mold.
Background technique
In recent years, with the continuous improvement to automotive light weight technology and fuel consumption requirement, aluminum alloy materials are in automobile zero
Application on component is rapidly developed, and aluminium alloy foot pedal is exactly a part therein.Foot pedal is mainly used in
The vehicles such as SUV, lorry, get on or off the bus convenient for people.Currently, the forming technology of aluminium alloy foot pedal is based on cold extrusion, and about
Relatively fewer, especially high-pressure casting is reported in the research of cast aluminium alloy gold pedal.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of high-pressure casting of aluminium alloy car foot pedal formings
Technique and mold.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of forming technology of aluminium alloy car foot pedal, comprising the following steps:
1) prepared by melting: aluminium alloy ingots being put into melting furnace and carries out melting, gone bad after fusing to aluminium alloy, refined
Processing, and carry out aluminium alloy degasification；
2) casting forming: mold preheating prepares, and then type, casting solidification, die sinking pickup are filled in molding, casting, finally removes
Cinder ladle and cast gate obtain foot pedal spray；
3) after casting forming, foot pedal spray natural cooling: is placed on progress natural cooling 12 under room temperature environment
~15h；
4) ageing treatment: casting being put into heat-treatment furnace and carries out ageing treatment, and operating temperature is 165~195 DEG C, is protected
The warm time is 3~5h.
As a preference, mold preheating temperature is 170~290 DEG C in the step 2.
As a preference, the pouring temperature of aluminium alloy is 630~660 DEG C in the step 2.
As a preference, injection high speed speed is 2.3~2.7m/s in cavity filling process in the step 2, and pressure maintaining
Time is 13~15s.
As a preference, the step 1 detects the Sr content in aluminium alloy at interval of 2~3h, and according to
It needs to add al-sr alloy, to guarantee the Sr content of aluminium alloy within the specified scope.
As a preference, the boss in foot pedal casting entirety and foot pedal casting is gone in the step 3
Burr, shaping.
As a preference, the raised head face on foot pedal casting is finished after the completion of the step 4.
A kind of aluminium alloy car foot pedal, the chemical component of the foot pedal are as follows: Si9.0~10.0%, Cu0~
0.6%, Mg0.4~0.6%, Fe0~0.13%, Mn0.7~0.9%, Zn0~0.5%, Ti0.21~0.28%, Pb0~
0.001%, Sr0.01~0.02%, surplus Al.
A kind of shaping dies of aluminium alloy car foot pedal, the elongated dynamic model of elongated cover half and rear side including front side, institute
The back side for stating elongated dynamic model is provided with thimble fixed plate and thimble push plate, is provided with thimble and thimble in the thimble fixed plate
Hole, the centre hole use ellipsoidal structure, wherein the long axis length of the centre hole is greater than the diameter of thimble.
The beneficial effects of the present invention are: be directed to automatic pedal performance requirement, by melting preparation, casting forming, from
The processing steps such as right cooling, ageing treatment ensure that aluminium alloy car foot pedal die casting has excellent comprehensive mechanical property,
Meet service performance requirement.In addition, avoiding in press casting procedure by using the thimble pore structure of ellipse because of mold part temperature
Spend generation that is high and leading to thimble metaboly, ensure that the smooth demoulding of foot pedal casting, can reach production efficiency improve,
The effect that production cycle shortens.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the installation diagram of automatic pedal die casting in the present invention.
Fig. 2 is the structural schematic diagram of automatic pedal die casting dynamic model in the present invention.
Specific embodiment
In order to which the objects, technical solutions and advantages of the application are more clearly understood, the present invention is carried out below further
It is described in detail, some specific details can be related in following description.And in these no specific details, the present invention then may be used
It can still realize, i.e., the technical staff in fields is using these descriptions herein and states other skills into fields
Art personnel can more effectively introduce their work essence.
A kind of aluminium alloy car foot pedal, the chemical component of the foot pedal are as follows: Si9.0~10.0%, Cu0~
0.6%, Mg0.4~0.6%, Fe0~0.13%, Mn0.7~0.9%, Zn0~0.5%, Ti0.21~0.28%, Pb0~
0.001%, Sr0.01~0.02%, surplus Al.Sr can be effectively improved the shape of eutectic Si particle in alloy as alterant
Looks, to improve the mechanical property of alloy, especially elongation.In addition, experiment show in aluminium alloy Sr content it is continuous
Increase, the tensile strength and elongation of alloy show the variation tendency for first increasing and subtracting afterwards.Therefore, during aluminium alloy smelting
It must be strictly controlled the content of Sr, to guarantee that alloy property reaches optimum state.
A kind of forming technology of aluminium alloy car foot pedal, comprising the following steps:
(1) prepared by melting: aluminium alloy ingots being put into melting furnace and carries out melting, is gone bad after fusing to aluminium alloy, essence
Refining processing, and be passed through high pure nitrogen and carry out aluminium alloy degasification；
(2) casting forming: mold preheating prepares, and then type, casting solidification, die sinking pickup are filled in molding, casting, finally removes
Cinder ladle and cast gate obtain foot pedal spray；
(3) after casting forming, foot pedal spray natural cooling: is placed on progress natural cooling 12 under room temperature environment
~15h；
(4) ageing treatment: casting being put into heat-treatment furnace and carries out ageing treatment, and operating temperature is 165~195 DEG C, is protected
The warm time is 3~5h.After Wetted constructures, the intensity of foot pedal casting be will be enhanced, to reach requirement.
In the present embodiment, pedal material uses aluminium alloy, and specifically aluminium alloy ingots is put into melting furnace and carries out melting.
The temperature of melting furnace is 650~690 DEG C in the step 1, guarantees Smelting Effect.Aluminium alloy refines every time in the step 1
Interval time is 150~200min, and the temperature of refining is 720~740 DEG C.In the step 1 to aluminium alloy be added refining agent and
1~2Kg of xeraphium, liquid level stirs at least 10min, and claws dross, but can not add foundry returns.In the step 1 at interval of
2~3h detects the Sr content in aluminium alloy, and al-sr alloy is added as needed, to guarantee the Sr content of aluminium alloy
Within the specified scope.To guarantee the Sr content of aluminium alloy in 0.01~0.02% range in the present embodiment.Metamorphism treatment mistake
Journey needs to add Al-10Sr intermediate alloy to aluminum alloy melt progress Metamorphism treatment, and be passed through high pure nitrogen or high-purity argon gas etc.
The inactive gas of chemical property carry out aluminium alloy degasification, specifically ventilated using porous stone inker.By the conjunction of step 1 melting
The temperature of golden liquid is 630~660 DEG C, to guarantee die casting effect.
Before the press casting procedure for carrying out step 2, equipment and shaping dies situation are first confirmed, and carried out with firelock baking dies
Preheating, control mold temperature reach 170~290 DEG C, and the pouring temperature of aluminium alloy is 630~660 DEG C.It is poured after molding,
Guarantee that injection high speed speed reaches 2.3~2.7m/s in cavity filling process, the dwell time is 13~15s.It is opened after casting is cooling
Mould takes out casting, removes cinder ladle and cast gate, obtains pedal spray.
Deburring, Shape correction are carried out to foot pedal casting entirety and lug boss position in the step 3, that is, utilize step 3
Time carry out above-mentioned cast(ing) surface processing, production efficiency can be improved.
Temperature in the step 4 in heat-treatment furnace is 165~195 DEG C, after opening heat-treatment furnace heating power switch,
Fan power is opened immediately, causes heating uneven if the machine that do not blow in, or even meeting heat-treatment furnace instead burns the motor at top.Timeliness
After processing, the performance of casting has obtained very big improvement, especially intensity, and the tensile strength of medium casting can be improved 10% or more,
Yield strength even can be improved 30% or more.
Wear test can be by carrying out, before on-test on M-2000 type friction wear testing machine, the 30min that first carries out
Running-in test, the quality of sample, is then loaded onto the mill that scheduled load carries out the corresponding time before measurement is worn after adjustment
Damage test.After wear test, the quality of sample is measured, and calculates the quality wear rate of sample.To guarantee experimentation
Middle sample is in continuous oil lubrication state.In test, fretting wear sample above is fixed, and friction pair sample below turns
Dynamic, i.e., what sample carried out is the test of oil lubrication boundary friction sliding frictional wear, and the secondary revolving speed that rubs is 200r/min.Tension test
It can be carried out on 3000kN cupping machine, in order to ensure tension test obtains the accuracy of data, per sample (p.s.) can all do weight
Multiple experiment, final result is the average value of multi-group data.The test of Brinell hardness can pass through HB-3000 type Brinell hardness test
Machine, especially by the hardened steel ball or sintered carbide ball of certain diameter, with a certain size test force pressing in sample surface, through advising
After the fixed retention time, removal test force, specimen surface will remain impression, measure the impression diameter of specimen surface, calculate
Ball hardness number.For alusil alloy, eutectic silicon is hard phase, and Al phase is relatively soft.If impression is pressed in Al phase
Intensive place, hardness number can be relatively low；If being pressed in eutectic silicon intensively to locate, hardness number can be higher.In order to avoid the production of error as far as possible
It is raw, hardness test three times has at least been done to each sample.
Practice result shows when the technological parameters such as cast temperature, injection speed, mold temperature are in OK range, casting
Temperature field, stress field, velocity field distribution uniform, the casting flaws such as surface defect, oxide inclusion and stomata are less.It is described
The raised head face on foot pedal casting is finished after the completion of step 4.Finishing step includes being processed by numerically-controlled machine tool
The plane and threaded hole of boss, there are also beat grinding foot pedal cast(ing) surface using pneumatic sander, sand paper, it is ensured that foot pedal casting
Surrounding is without Li Jiao, product surface fairing.In addition, each aperture position burr of removal foot pedal casting and Li Jiao, are not allow for obvious
Convex-concave polish trace.
In order to thorough explanation the present invention, furthermore it should be noted that word used in the following description " front side ", " after
Side ", "left", "right" etc. refer to that the direction in attached drawing, word "inner" and "outside" are referred respectively to towards or away from particular elements
The direction of geometric center, related technical personnel should not be construed as this in the adjustment for making simply, not needing creativeness to above-mentioned direction
Apply for the technology other than protection scope.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting real protection scope.And it is the purpose of the present invention of avoiding confusion, due to the manufacturing method of well known mold, control journey
The technology of sequence, part dimension, material composition etc. is not it will be understood that therefore they are described in detail.Referring to Fig.1, scheme
2, a kind of shaping dies of aluminium alloy car foot pedal, the elongated dynamic model 2 of elongated cover half 1 and rear side including front side, foot pedal
The left and right directions of casting is length direction, and the back side of the elongated dynamic model 2 is provided with top plate fixed plate 3 and thimble push plate 4, institute
It states and is provided with thimble 5 and centre hole 31 in thimble fixed plate 3, the centre hole 31 uses ellipsoidal structure, wherein the thimble
The long axis length in hole is greater than the diameter of thimble.
In press casting procedure, casting solidification is shunk, mold expanded by heating.Super long type die casting this kind of for foot pedal and
Speech, mold are also easy to produce uneven heating (temperature that the temperature in the middle part of mold is higher than both ends) and cause to deform.This deformation certainly will be led
Causing thimble 5, deformation occurs or even fractures, and causes casting demoulding difficult, to influence production efficiency.In order to avoid this phenomenon
It generates, the present invention provides above-mentioned foot pedal die castings to eject 31 structure of hole, it is therefore prevented that thimble 5 occurs in press casting procedure
Deformation guarantees that subsequent demoulding is smooth.
Further illustrate technical solution of the present invention combined with specific embodiments below, but the content protected of the present invention not office
It is limited to as described below.
Embodiment 1
Wherein " embodiment " referred to herein refer to the special characteristic that may be included at least one implementation of the application,
Structure or characteristic." embodiment " that different places occur in the present specification not refers both to the same embodiment, nor individually
Or the selective embodiment mutually exclusive with other embodiments.
Embodiment includes a kind of aluminium alloy car foot pedal, the chemical component of the foot pedal are as follows: Si9.0%,
Cu0.6%, Mg0.6%, Mn0.9%, Zn0.3%, Ti0.26%, Sr0.02%, surplus Al.Aluminium alloy car foot pedal
Forming technology the following steps are included:
1) prepared by melting: carrying out rotten and refining treatment after aluminium alloy ingots fusing；It is wherein smart in melting furnace at interval of 3h
Refining is primary, and refining temperature is 720 DEG C；When interval time is more than 2.5h, need to detect Sr content in aluminium alloy, and according to
It needs to add al-sr alloy to guarantee that Sr content reaches prescribed limit, and is removed the gred in time, degasification；
2) casting forming: preheating mold before casting, and control mold temperature reaches 170 DEG C；Aluminium alloy temperature is 630
DEG C, it is poured after molding, guarantees that injection high speed speed reaches 2.5m/s, dwell time 13s, casting cooling in cavity filling process
After be opened, take out casting, remove cinder ladle and cast gate, obtain foot pedal spray；
3) natural cooling: palpus natural cooling 13h after foot pedal Die-Casting, and foot pedal casting entirety and foot pedal are cast
Boss on part carries out deburring, shaping；
4) ageing treatment: casting being put into heat-treatment furnace and carries out ageing treatment, and operating temperature is 165 DEG C, soaking time
For 3h.It after ageing treatment, takes out foot pedal casting and is checked, one it is found that product surface has bubble or bulge, be at once
Isolation processing, qualified foot pedal casting then finish raised head face.
Embodiment 2
Including a kind of ultra-long automobile aluminium alloy foot pedal, the chemical component of the foot pedal are as follows: Si9.5%, Mg0.5%,
Fe0.13%, Mn0.5%, Zn0.5%, Ti0.21%, Pb0.001%, Sr0.012%, surplus Al.Aluminium alloy car foot
The forming technology of pedal the following steps are included:
1) prepared by melting: greasy dirt, the oxide skin etc. on removal needed smelting raw material surface remove the dirt on melting tool
Object is simultaneously uniformly coated with one layer of oxidation Chinese catalpa protective coating on its working face, carries out rotten and refining treatment after aluminium alloy ingots fusing,
Melting furnace uses electromagnetic induction graphite stack aluminium melting furnace；Wherein at interval of 2.5h fusing furnace refining it is primary, refining temperature 730
℃；When interval time is more than 2h, need to detect Sr content in aluminium alloy, and al-sr alloy is added as needed to guarantee
Sr content reaches prescribed limit, and is removed the gred in time, degasification；
2) casting forming: preheating mold before casting, and control mold temperature reaches 210 DEG C；Aluminium alloy temperature is 640
DEG C, it is poured after molding, guarantees that injection high speed speed reaches 2.3m/s, dwell time 14s, casting cooling in cavity filling process
After be opened, take out casting, remove cinder ladle and cast gate, obtain foot pedal spray；
3) natural cooling: palpus natural cooling 12h after foot pedal Die-Casting, and foot pedal casting entirety and foot pedal are cast
Boss on part carries out deburring, shaping；
4) ageing treatment: casting being put into heat-treatment furnace and carries out ageing treatment, and operating temperature is 195 DEG C, soaking time
For 5h.It after ageing treatment, takes out foot pedal casting and is checked, one it is found that product surface has bubble or bulge, be at once
Isolation processing, qualified foot pedal casting then finish raised head face.
Embodiment 3
Including a kind of aluminium alloy car foot pedal, the chemical component of the foot pedal are as follows: Si10.0%, Cu0.3%,
Mg0.4%, Fe0.1%, Mn0.7%, Ti0.28%, Pb0.001%, Sr0.015%, surplus Al.Aluminium alloy car is foot-operated
The forming technology of plate the following steps are included:
1) prepared by melting: carrying out rotten and refining treatment after aluminium alloy ingots fusing；Wherein at interval of 200min in melting furnace
Interior refining is primary, and refining temperature is 740 DEG C；When interval time is more than 3h, need to detect Sr content in aluminium alloy, and root
According to needing to add al-sr alloy to guarantee that Sr content reaches prescribed limit, and removed the gred in time, degasification；
2) casting forming: preheating mold before casting, and control mold temperature reaches 290 DEG C；Aluminium alloy temperature is 640
DEG C, it is poured after molding, guarantees that injection high speed speed reaches 2.7m/s, dwell time 15s, casting cooling in cavity filling process
After be opened, take out casting, remove cinder ladle and cast gate, obtain foot pedal spray；
3) natural cooling: palpus natural cooling 15h after foot pedal Die-Casting, and foot pedal casting entirety and foot pedal are cast
Boss on part carries out deburring, shaping；
4) ageing treatment: casting being put into heat-treatment furnace and carries out ageing treatment, and operating temperature is 185 DEG C, soaking time
For 4h.It after ageing treatment, takes out foot pedal casting and is checked, one it is found that product surface has bubble or bulge, be at once
Isolation processing, qualified foot pedal casting then finish raised head face.
According to above-mentioned principle, the present invention can also be made appropriate changes and modifications to the above embodiments.Therefore, this hair
It is bright to be not limited to specific embodiment disclosed and described above, some modifications and changes of the invention should also be as to fall into this
In the scope of protection of the claims of invention.
Claims (1)
1. a kind of forming technology of aluminium alloy car foot pedal, which is characterized in that using a kind of aluminium alloy car foot pedal at
Shape mold, the elongated dynamic model (2) of elongated cover half (1) and rear side including front side, elongated dynamic model (2) back side are provided with thimble
Fixed plate (3) and thimble push plate (4) are provided with thimble (5) and centre hole (31), the thimble on the thimble fixed plate (3)
Hole (31) uses ellipsoidal structure, wherein the long axis length of the centre hole is greater than the diameter of thimble, the foot pedal processed
Chemical component (mass percent) are as follows: Si9.0~10.0%, Cu0~0.6%, Mg0.4~0.6%, Fe0~0.13%,
Mn0.7~0.9%, Zn0~0.5%, Ti0.21~0.28%, Pb0~0.001%, Sr0.01~0.02%, surplus Al,
The following steps are included:
1) prepared by melting: aluminium alloy ingots being put into melting furnace and carries out melting, is gone bad after fusing to aluminium alloy, at refining
Reason, and be passed through high pure nitrogen progress aluminium alloy degasification and need to detect the Sr content in aluminium alloy at interval of 2~3h, and
Al-Sr intermediate alloy is added as needed, to guarantee the Sr content of aluminium alloy within the specified scope；
2) casting forming: mold preheating prepares, and then type, casting solidification, die sinking pickup are filled in molding, casting, finally removes cinder ladle
And cast gate, foot pedal spray is obtained, mold preheating temperature is 170~290 DEG C, and the pouring temperature of aluminium alloy is 630~660
DEG C, injection high speed speed reaches 2.3~2.7m/s in cavity filling process, and the dwell time is 13~15s；
3) natural cooling: after casting forming, by foot pedal spray be placed under room temperature environment carry out natural cooling 12~
15h；
4) ageing treatment: casting being put into heat-treatment furnace and carries out ageing treatment, and operating temperature is 165~195 DEG C, soaking time
For 3~5h.
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| CN107828999A (en) * | 2017-12-18 | 2018-03-23 | 广州致远新材料科技有限公司 | The heat treatment method and die-cast aluminum alloy material of a kind of pack alloy |
| CN107829000B (en) * | 2017-12-18 | 2020-03-20 | 广州致远新材料科技有限公司 | Die-casting aluminum alloy material and preparation method thereof |
| CN110106812A (en) * | 2019-05-26 | 2019-08-09 | 宁波市晶杰国际物流有限公司 | A kind of road guardrail and its manufacturing process |
| CN112853170A (en) * | 2021-01-05 | 2021-05-28 | 华劲新材料研究院(广州)有限公司 | High-strength high-toughness aluminum alloy and preparation method thereof |
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| JP2015157588A (en) * | 2014-02-25 | 2015-09-03 | 日本精工株式会社 | aluminum die-cast steering column |
| CN105603269A (en) * | 2016-01-25 | 2016-05-25 | 张颖 | Method for manufacturing aluminum automobile gearbox shell |
| CN205341878U (en) * | 2016-01-28 | 2016-06-29 | 重庆世华模具有限公司 | Mould locking back -acting shovel mechanism |
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| CN101457318B (en) * | 2008-12-20 | 2010-11-24 | 中国兵器工业第五二研究所 | High-silicon aluminum alloy cylinder sleeve material and preparation method thereof |
| CN101758194B (en) * | 2009-12-17 | 2011-09-28 | 中国兵器工业第五二研究所 | Indirect extruding and casting method of wrought aluminum alloy casting |
| CN105065514B (en) * | 2015-07-09 | 2017-11-28 | 宁波海瑞时新材料有限公司 | A kind of automotive brake hub and preparation method thereof |
| CN105041921B (en) * | 2015-07-09 | 2017-09-05 | 宁波海瑞时新材料有限公司 | A kind of automobile brake disc and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015157588A (en) * | 2014-02-25 | 2015-09-03 | 日本精工株式会社 | aluminum die-cast steering column |
| CN105603269A (en) * | 2016-01-25 | 2016-05-25 | 张颖 | Method for manufacturing aluminum automobile gearbox shell |
| CN205341878U (en) * | 2016-01-28 | 2016-06-29 | 重庆世华模具有限公司 | Mould locking back -acting shovel mechanism |
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