CN106735225B - A method of being injected into shape forging aluminium alloy brake disc brake drum - Google Patents
A method of being injected into shape forging aluminium alloy brake disc brake drum Download PDFInfo
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- CN106735225B CN106735225B CN201611217467.7A CN201611217467A CN106735225B CN 106735225 B CN106735225 B CN 106735225B CN 201611217467 A CN201611217467 A CN 201611217467A CN 106735225 B CN106735225 B CN 106735225B
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- aluminium alloy
- brake drum
- brake disc
- disc brake
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/115—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces by spraying molten metal, i.e. spray sintering, spray casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/18—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass brake shoes
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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
- C22C21/02—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
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
-
- 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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
-
- 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
- C22F1/043—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 silicon as the next major constituent
Abstract
The present invention relates to a kind of methods being injected into shape forging aluminium alloy brake disc brake drum, including：(1) melting；(2) injection forming；(3) blanking；(4) it forges；(5) it is heat-treated；(6) it machines.First by the aluminium alloy smelting of special component, blank is prepared in such a way that injection shapes, again blank is processed into suitably sized and hydraulic press and mold forging and molding brake disc brake drum forging, last thermally treated and machining is used to obtain brake disc brake drum part.Beneficial effects of the present invention are：The aluminium alloy brake disc brake drum prepared by this method improves 23 times compared to cast iron brake disk brake drum weight saving 40 70%, thermal coefficient, mechanical strength more high-wearing feature is more preferable, meet automotive light weight technology development trend, system temperature raising under high speed on-position, which can effectively be solved, causes heat fading to influence braking effect, improve travel safety, service life extends 23 times than casting brake disc brake drum.
Description
Technical field
The invention belongs to technical field of automobile accessories, and in particular to a kind of processing technology of brake disc brake drum, especially
A method of being injected into shape forging aluminium alloy brake disc brake drum.
Background technology
Brake system of car has two kinds of forms of disc brake and drum brake, and current brake disk brake drum mostly uses cast iron quality, with ash
Cast iron HT250 is representative, casting technique production.Excellent brake disc brake drum should have lightweight, have enough intensity, excellent
Wearability, enough high-temperature behaviors, excellent heat dissipation performance and fatigue performance.Due to the office by material and casting technique
Limit, cast iron brake disk brake drum heavier-weight, and under spring, increase automobile fuel consumption, influence accelerating ability.Using forging
The single weight of aluminium alloy brake disc brake drum can mitigate 40-70% compared to cast iron brake disk brake drum, and light weight effect is notable.
Cast iron quality thermal coefficient is relatively low, only about 58W/ (mk), and in high speed braking or continuous braking, short time friction generates big
Calorimetric, lower thermal conductivity cause heat not distribute in time, can cause brake disc brake drum heat fading, influence braking effect and
Service life.Reflectal thermal coefficient reaches 120-180W/ (mk), and the capacity of heat transmission is the 2- of cast iron brake disk brake drum
3 times, brake heat can be distributed in time, ensure that the reliability of braking system.Cast iron brake disk brake drum requires tensile strength
Not less than 210MPa, hardness is injected into shape forging aluminium alloy brake disc brake drum tensile strength and reaches between 187-241HB
400-550MPa, hardness can meet mechanical property requirements completely between 190-230HB.
Existing patent document, Patent No. CN201310058382.9 propose to produce high silicon using the method for semi-solid casting
Aluminum Moving plate brake drum.Though semi-solid casting method is better than conventional casting techniques, semi solid slurry is easily involved in gas, leads to casting
There are gas hole defects for inside, generally can not further heat treatment reinforcement.Semi-solid casting method mechanical property is slightly better than general casting,
But far away from being injected into shape forging technique.Material composition limitation can be broken through by being injected into shape forging technique, further increase reinforcing
The high-performance aluminium alloy brake disc brake drum that constituent content, production routine casting and semi-solid casting can not produce.Injection forming
Cooperation forging is a kind of new process preparing high-performance aluminium alloy parts, is especially suitable for preparing high-strength, wear-resisting, alumite conjunction
Gold.Opposite casting technique spray deposition processing cooling velocity is fast, and material grains are tiny, the distribution of hardening constituent particle dispersion, no tradition
Casting flaw substantially increases the strength of materials, hardness, frictional behaviour and fatigue behaviour.
Invention content
The defects of in order to solve big cast iron brake disk brake drum weight existing in the prior art, poor thermal conductivity, the present invention
Provide a kind of method being injected into shape forging aluminium alloy brake disc brake drum, the product that technical solution is produced through the invention
With light weight, excellent thermal conductivity, and also have the characteristics that higher-strength, wearability, fatigue durability, can be used for each discharge plate
Brake automobile.
The technical solution adopted in the present invention is：A method of it being injected into shape forging aluminium alloy brake disc brake drum, is wrapped
Include following steps：
Step 1, melting：Melting manufactures the aluminium alloy raw material of aluminium alloy brake disc brake drum, each ingredient in aluminium alloy raw material
Mass percent is as follows：Si：15-40%；Fe:0.1-2%；Ni：0.1-2%；Cu：0.3-4.5%；Mg：0.3-2%, Al are
49.5-84.2%；
Step 2, injection forming：By spray deposition processing equipment, using high pressure nitrogen to described in being obtained in step 1
Aluminium alloy raw material carries out injection forming, prepares a diameter of 200-500mm blanks；
Step 3, blanking：Using the epidermis of the blank obtained in lathe removal step two, table will be removed using sawing machine
The injection after skin forms Billet cutting to the material block of required size, and then the material block is put into heating furnace and is heated, is added
Hot temperature is 300-600 DEG C, and heating time is 0.5-6 hours；The size of the material block is according to the practical ruler of brake disc brake drum
Very little decision.
Step 4, forging：The shaping dies on hydraulic press is first preheating to 200-500 DEG C, then the shaping dies again
The material block obtained in step 3 is finally placed into the oil by surface spraying water-based graphite releasing agent or oil-based release agent again
The shaping dies on press you forge and be processed into forging；
Step 5, heat treatment：The forging obtained in step 4 is first subjected to solution treatment, solid solution temperature 400-
600 DEG C, the solution treatment time is 0.5-5 hours, and the forging is put into quenching after being taken out out of solution treatment equipment in 20 seconds
In equipment, hardening heat is 10-80 DEG C, and the cool time is 2-80 seconds, and quenched treated that the forging carries out at timeliness again
Reason, aging temp are 100-250 DEG C, and aging time is 6-30 hours；
Step 6, machining：By the forging of the priority obtained in step 5 after solid solution, quenching and ageing treatment
It is put on numerically controlled lathe and is machined, finally obtain brake disc brake drum finished product.
Further improvement of the present invention, deposit preform silicon phase size is not more than 15 μm in the blank obtained in step 2.
Further improvement of the present invention, the aluminium alloy material quality percentage obtained in step 1 are Si：32%；
Fe:0.5%；Ni：0.2%；Cu：3.8%；Mg：1.5%, Al 62%
Further improvement of the present invention, a diameter of 300mm of the blank obtained in step 2.
Further improvement of the present invention, the material block obtained in step 3, which is put into heating furnace, to be heated, and heating temperature is
400-600 DEG C, heating time is 0.5-5 hours.
Further improvement of the present invention, the hydraulic press maximum pressure used in step 4 are 5000T.
Further improvement of the present invention, the shaping dies used in step 4 are preheating to 350-500 DEG C.
The use of water-based graphite releasing agent or the oil-based release agent fills type and demoulding conducive to the forging.
Further improvement of the present invention, solid solution temperature is 450-600 DEG C in step 5, and the solution treatment time is 1-5
Hour, the forging is put into 15 seconds in quenching apparatus after being taken out out of solution treatment equipment, to completing the institute of solution treatment
It states forging and carries out quenching treatment, hardening heat is 50 DEG C, and the cool time is 60 seconds, and quenched treated that the forging carries out again
Ageing treatment, aging temp are 120-200 DEG C, and aging time is 6-30 hours.
Beneficial effects of the present invention are：
1, compared with prior art, the aluminum alloy material brake disc brake drum of technical solution of the present invention manufacture, weight are comparable
Traditional cast iron brake disc brake drum loss of weight 40-70%, alleviates complete vehicle weight, oil consumption also decreases, and realizes energy-saving and emission-reduction
Purpose；Brake disc brake drum raw material of the present invention takes spray deposition processing, and there is no casting flaw, even tissue, crystal grain is tiny；
The characteristics of forging technology is taken in forming, has forging technology streamline complete, high mechanical properties.
2, injection forming makes the brake disc brake drum have higher intensity, hardness, wearability and resist with forging technology
Fatigue behaviour meets brake disc drum sub-assembly of parking brake requirement.The aluminum alloy material thermal coefficient of the brake disc brake drum is
2-3 times of traditional cast iron material, will improve cast iron brake disk brake drum poor heat radiation in high speed braking or continuous braking causes
Heat fading, improve skidding reliability and travel safety.
3, aluminium alloy brake disc brake drum of the invention can not only completely eliminate tradition using shape forging technique is injected into
Metallurgical imperfection present in casting and semi-solid casting, can also break through the limitation of material composition, further increase intensified element
Content.
4, there is lightweight, rapid heat dissipation, mechanical performance height using aluminium alloy brake disc brake drum produced by the invention, it is wear-resisting
Damage, antifatigue, long lifespan characteristic, can be used for various disc brake automobiles.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of embodiment production product for the method that the present invention is injected into shape forging aluminium alloy brake disc brake drum
Metallograph；
Fig. 2 is another embodiment production product for the method that the present invention is injected into shape forging aluminium alloy brake disc brake drum
Metallograph.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, technical scheme of the present invention will be carried out below
Detailed description.Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than whole implementation
Example.Based on the embodiments of the present invention, those of ordinary skill in the art are acquired without making creative work
All other embodiment, belong to the range protected of the present invention.
Embodiment 1：
As shown in Figure 1, a kind of method being injected into shape forging aluminium alloy brake disc brake drum, includes the following steps：Step
One, melting：Melting manufactures the aluminium alloy raw material of aluminium alloy brake disc brake drum, and aluminium alloy raw material uses the alloy using Al as matrix
Melting is carried out, wherein also containing following alloying element in addition to Al, is indicated with mass percent：Si：26%, Fe：0.2%,
Ni：0.12%, Cu：3.8%, Mg：1.1%.Step 2, injection forming：By spray deposition processing equipment, high pressure nitrogen is used
Injection forming is carried out to the aluminium alloy raw material obtained in step 1, obtains diameter 260mm blanks.Step 3, blanking：Use lathe
Blank is switched to diameter 250mm, then further according to be processed by the blank epidermis of the diameter 260mm obtained in removal step two
Brake disc brake drum size calculate needed for material block height, a diameter of 250mm Billet cuttings will be processed into required height
Then material block is put into heating furnace and heats by the material block of degree, heating temperature is set as 550 DEG C, keeps the temperature 3 hours.Step 4, forging
It makes：The shaping dies on hydraulic press is first preheated to 350 DEG C；Using 5000T hydraulic presses, pressure is set as 4000T, after preheating
Oil-based release agent is sprayed on shaping dies, the material block obtained in step 3, which is placed into forging in shaping dies, is processed into forging.
Step 5, heat treatment：By the forging obtained in step 4 carry out solution treatment, 550 DEG C of solid solubility temperature, soaking time 2 hours, Gu
Molten be disposed is quenched at once, and forging is taken out to the time interval being put into quenching apparatus from solution treatment equipment not
More than 20 seconds, 50 DEG C of water temperature is quenched, 60 seconds cool times, quenched treated that forging carries out ageing treatment, aging temp again
It it is 180 DEG C, timeliness soaking time is 10 hours, and forging is then taken out holding furnace, makes forging in air cooling to room temperature.Step
Six, machining：The forging that step 5 is finally cooled to room temperature is added using numerically controlled lathe according to brake disc brake drum drawing requirement
Work is to finished product.The brake disc brake drum tensile strength manufactured using the above method reaches 504MPa, hardness 196HB, metallograph
Middle particle is hard hardening constituent silicon in aluminium alloy, it can be seen that silicon phase small and dispersed is distributed after injection forming and forging, this
It ensure that brake disc brake drum has excellent polishing machine.
Embodiment 2：
As shown in Fig. 2, a kind of method being injected into shape forging aluminium alloy brake disc brake drum, includes the following steps：Step
One, melting：Melting manufactures the aluminium alloy raw material of aluminium alloy brake disc brake drum, and aluminium alloy raw material uses the alloy using Al as matrix
Melting is carried out, wherein also containing following alloying element in addition to Al, is indicated with mass percent：Si：32%, Fe：0.5%,
Ni：0.15%, Cu：4.1%, Mg：1.2%.Step 2, injection forming：By spray deposition processing equipment, high pressure nitrogen is used
Injection forming is carried out to the aluminium alloy raw material obtained in step 1, obtains diameter 300mm blanks.Step 3, blanking：Use lathe
Blank is switched to diameter 280mm, then further according to be processed by the blank epidermis of the diameter 300mm obtained in removal step two
Brake disc brake drum size calculate needed for material block height, a diameter of 280mm Billet cuttings will be processed into required height
Then material block is put into heating furnace and heats by the material block of degree, heating temperature is set as 450 DEG C, keeps the temperature 2 hours.Step 4, forging
It makes：The shaping dies on hydraulic press is first preheated to 400 DEG C；Using 5000T hydraulic presses, pressure is set as 4400T, after preheating
Water-based graphite releasing agent is sprayed on shaping dies, the material block obtained in step 3, which is placed into forging in shaping dies, is processed into forging
Part.Step 5, heat treatment：The forging obtained in step 4 is subjected to solution treatment, 500 DEG C of solid solubility temperature, soaking time 2.5 is small
When, solution treatment finishes to be quenched at once, and forging is taken out to the time being put into quenching apparatus from solution treatment equipment
Interval is no more than 30 seconds, quenches 60 DEG C of water temperature, and 60 seconds cool times, quenched treated that forging carries out ageing treatment again, when
It is 175 DEG C to imitate temperature, and timeliness soaking time is 12 hours, and forging is then taken out holding furnace, makes forging in air cooling to room
Temperature.Step 6, machining：The forging that step 5 is finally cooled to room temperature uses numerically controlled lathe according to brake disc brake drum drawing
It is required that being machined to finished product.The brake disc brake drum tensile strength manufactured using the above method reaches 540MPa, hardness 226HB, from
It can be found that the raising with Si constituent contents, the graininess hard hardening constituent in material are significantly more than embodiment in metallograph
1, this makes embodiment 2 compare 1 hardness higher of embodiment, and wear-resisting property is more preferable.It is injected into the braking of shape forging aluminium alloy brake disc
Drum metallographic structure is uniform, completely eliminates the casting flaw that cast iron brake disk brake drum is difficult to avoid that, has excellent mechanical property
Energy.
By Example 1 and Example 2 of the present invention and traditional cast iron HT250 performance comparisons, data are as follows：
The present invention is compared with traditional cast iron, is injected into shape forging aluminium alloy brake disc brake drum intensity higher, hardness and casting
Iron Moving plate brake drum is suitable, but thermal conductivity is 2-3 times of cast iron, in brake process, can effectively reduce because of braking process
The frictional heat of generation is accumulated, while shortening braking distance, extends the brake disc brake drum service life.Aluminum alloy material density is only cast
About the 1/3 of iron, using each brake disc brake drum of aluminum alloy material can loss of weight 40~70%, light weight effect is notable.It is injected into
Shape forging technique also has better fatigue performance compared to the aluminium alloy brake disc brake drum of casting or Semi-solid Process production
And abrasion resistance properties, improve the driving safety of motor vehicle.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (8)
1. a kind of method being injected into shape forging aluminium alloy brake disc brake drum, which is characterized in that include the following steps：
Step 1, melting：Melting manufactures the aluminium alloy raw material of aluminium alloy brake disc brake drum, each composition quality in aluminium alloy raw material
Percentage is as follows：Si：15-40%；Fe:0.1-2%；Ni：0.1-2%；Cu：0.3-4.5%；Mg：0.3-2%, Al 49.5-
84.2%；
Step 2, injection forming：By spray deposition processing equipment, using high pressure nitrogen to the alloy that is obtained in step 1
Liquid raw material carries out injection forming, prepares the blank of a diameter of 200-500mm；
Step 3, blanking：Using the epidermis of the blank obtained in lathe removal step two, after removing epidermis using sawing machine
The Billet cutting to the material block of required size, then the material block is put into heating furnace and is heated, heating temperature 300-
600 DEG C, heating time is 0.5-6 hours；
Step 4, forging：The shaping dies on hydraulic press is first preheating to 200-500 DEG C, then in the forming mould surface
Water-based graphite releasing agent or oil-based release agent are sprayed, the material block obtained in step 3 is finally placed into the hydraulic press again
On the shaping dies in forging be processed into forging；
Step 5, heat treatment：The forging obtained in step 4 is first subjected to solution treatment, solid solution temperature 400-
600 DEG C, the solution treatment time is 0.5-5 hours, and the forging is put into quenching after being taken out out of solution treatment equipment in 20 seconds
In equipment, the forging to completing solution treatment carries out quenching treatment, and hardening heat is 10-80 DEG C, cool time 2-80
Second, quenched treated the forging carries out again ageing treatment, aging temp is 100-250 DEG C, and aging time is that 6-30 is small
When；
Step 6, machining：The forging of the priority obtained in step 5 after solid solution, quenching and ageing treatment is put into
It is machined on numerically controlled lathe, finally obtains brake disc brake drum finished product.
2. the method according to claim 1 for being injected into shape forging aluminium alloy brake disc brake drum, it is characterised in that：Step
Deposit preform silicon phase size is not more than 15 μm in the blank obtained in two.
3. the method according to claim 1 for being injected into shape forging aluminium alloy brake disc brake drum, it is characterised in that：Step
The aluminium alloy material quality percentage obtained in one is：Si：32%；Fe:0.5%；Ni：0.2%；Cu：3.8%；Mg：
1.5%；Al is 62%.
4. the method according to claim 1 for being injected into shape forging aluminium alloy brake disc brake drum, it is characterised in that：Step
A diameter of 300mm of the blank obtained in two.
5. the method according to claim 1 for being injected into shape forging aluminium alloy brake disc brake drum, it is characterised in that：Step
The material block obtained in three, which is put into heating furnace, to be heated, and heating temperature is 400-600 DEG C, and heating time is 0.5-5 hours.
6. the method according to claim 1 for being injected into shape forging aluminium alloy brake disc brake drum, it is characterised in that：Step
The hydraulic press maximum pressure used in four is 5000T.
7. the method according to claim 1 for being injected into shape forging aluminium alloy brake disc brake drum, it is characterised in that：Step
The shaping dies used in four is preheating to 350-500 DEG C.
8. the method according to claim 1 for being injected into shape forging aluminium alloy brake disc brake drum, it is characterised in that：Step
Solid solution temperature is 450-600 DEG C in five, and 1-5 hours solution treatment time, the forging takes out out of solution treatment equipment
It is put into quenching apparatus in 15 seconds afterwards, the forging to completing solution treatment carries out quenching treatment, and hardening heat is 50 DEG C,
Cool time is 60 seconds, and quenched treated the forging carries out again ageing treatment, aging temp is 120-200 DEG C, timeliness
Time is 6-30 hours.
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| CN107385294A (en) * | 2017-08-01 | 2017-11-24 | 天津百恩威新材料科技有限公司 | A kind of aluminum alloy for automobile wheel hub and its spray deposition processing |
| CN107447136A (en) * | 2017-08-01 | 2017-12-08 | 天津百恩威新材料科技有限公司 | A kind of automobile brake disc or brake rim aluminium alloy and its spray deposition processing |
| CN110218915B (en) * | 2019-07-05 | 2021-07-20 | 江苏豪然喷射成形合金有限公司 | AlSi20Fe5Ni2Method for producing a blank |
| JP2022551449A (en) * | 2019-10-09 | 2022-12-09 | エリコン サーフェス ソリューションズ アーゲー、 プフェフィコン | Method for Producing Corrosion and Wear Resistant Cast Iron Brake Discs |
| CN110756742A (en) * | 2019-10-22 | 2020-02-07 | 广东机电职业技术学院 | High-hardness and anti-heat-decay automobile brake disc and preparation method and application thereof |
| CN113458721B (en) * | 2021-06-17 | 2022-05-13 | 中机精密成形产业技术研究院（安徽）股份有限公司 | Preparation method of high-strength aluminum alloy guide bar grooved needle connecting rod |
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| US5884388A (en) * | 1995-05-12 | 1999-03-23 | Aluminum Company Of America | Method for manufacturing a friction-wear aluminum part |
| CA2479032C (en) * | 2004-09-13 | 2009-04-21 | Jingzeng Zhang | Multifunctional composite coating and process |
| CN100507046C (en) * | 2007-12-08 | 2009-07-01 | 中国兵器工业第五二研究所 | Nitrogen jet deposited magnesium alloy material and its preparation process |
| CN101775527B (en) * | 2010-03-11 | 2012-07-25 | 湖南大学 | Ceramic particle reinforced aluminum-based gradient composite material and preparation method thereof and jetting precipitation device for preparing material |
| CN102952930A (en) * | 2011-08-24 | 2013-03-06 | 湘潭高耐合金制造有限公司 | Heat treatment process and heat treatment case of alloy steel shaft mounted brake disc |
| CN105970034A (en) * | 2016-07-11 | 2016-09-28 | 常州大学 | Aluminium alloy elevator brake disc and preparation method thereof |
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