CN105506411A - Special aluminum alloy ingot for wheel hub and preparation method of aluminum alloy ingot - Google Patents
Special aluminum alloy ingot for wheel hub and preparation method of aluminum alloy ingot Download PDFInfo
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- CN105506411A CN105506411A CN201510953857.XA CN201510953857A CN105506411A CN 105506411 A CN105506411 A CN 105506411A CN 201510953857 A CN201510953857 A CN 201510953857A CN 105506411 A CN105506411 A CN 105506411A
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- aluminium alloy
- alloy ingot
- wheel hub
- aluminum alloy
- refining
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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
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
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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
- B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
- B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
- B22D21/04—Casting aluminium or magnesium
-
- 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
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- 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
Abstract
The invention discloses a special aluminum alloy ingot for a wheel hub. The aluminum alloy ingot comprises the components by mass percent: 1.2-2.0% of Si, 0.05-0.2% of Mn, 0.05-0.1% of Cr, 2.0-2.8% of Mg, 0.1-0.3% of Cu, 0.1-0.3% of Zn, 0.3-0.8% of Ti, 0.09-0.25% of Sn, 0.1-0.2% of Zr, 0.1-0.2% of Er, 0.1-0.2% of Sr, less than or equal to 0.5% of gross other metallic and nonmetallic impurity elements, and the balance Al. A preparation method of the aluminum alloy ingot comprises the steps of melting, refining, standing and casting. According to the aluminum alloy ingot, the elements such as Ti, Zr, Er and Sr are added, so that metamorphism and refining functions can be exerted on the structure of an aluminium alloy, so that the mechanical property of the aluminium alloy is improved, and a guarantee is provided for improving the mechanical property of the aluminium alloy wheel hub.
Description
Technical field
The present invention relates to aluminum alloy ingot manufacture field, particularly forged hub dedicated aluminium alloy ingot and preparation method thereof.
Background technology
Along with the fast development of automotive industry, the application of aluminium alloy wheel hub is more and more general.Aluminium alloy wheel hub has four large advantages than steel wheel hub: one is reduce non-load weight, thus improves adherence properties; Two are improved accelerating ability and braking; Three are the increase in rigidity, the inclination of tire or wheel hub when the high rigidity of aluminium wheels significantly reduced curved, and this is particularly important for the car installing high-performance tire; Four is the cooling performances that improve breaking system, the thermal conductor that in the alloy of aluminium wheels, some metal is inherently good, so the heat that aluminium wheels is conducive to braking produces discharges rapidly thus reduces the brake failure because high thermal conductance causes, and due to aluminium alloy wheel hub can moulding more freely, just more can be conducive to some moulding effective temperature-reducing air-flow being imported to breaking system.But aluminum wheel hub also has some defects, such as: aluminium alloy is more crisp, be easy to occur crackle, and be not easily found, its intensity is also high less than steel.For improving the mechanical property of aluminium alloy wheel hub, start with from aluminum alloy materials particularly crucial.
At present, what cast aluminium alloy wheel hub generally adopted is A356 aluminium, and is disposable casting when producing aluminium alloy wheel hub, and do not reprocess, the internal organizational structure of metal does not change, and there is the problem that mechanical property is lower.
Summary of the invention
The invention provides wheel hub dedicated aluminium alloy ingot and preparation method thereof, rotten and thinning processing have been carried out, for the mechanical property improving aluminium alloy wheel hub provides guarantee to the aluminum alloy materials that aluminium alloy wheel hub adopts.
For achieving the above object, technical scheme of the present invention is:
A kind of wheel hub dedicated aluminium alloy ingot, the mass percent of each composition is respectively: Si1.2 ~ 2.0%, Mn0.05 ~ 0.2%, Cr0.05 ~ 0.1%, Mg2.0 ~ 2.8%, Cu0.1 ~ 0.3%, Zn0.1 ~ 0.3%, Ti0.3 ~ 0.8%, Sn0.09 ~ 0.25%, Zr0.1 ~ 0.2%, Er0.1 ~ 0.2%, Sr0.1 ~ 0.2%, other metals and nonmetallic impurity element total amount are no more than 0.5%, and all the other are Al.
Preferably, in described aluminum alloy ingot, the mass percent of each composition is respectively: Si1.7%, Mn0.12%, Cr0.08%, Mg2.5%, Cu0.2%, Zn0.2%, Ti0.6%, Sn0.18%, Zr0.15%, Er0.15%, Sr0.15%, other metals and nonmetallic impurity element total amount are no more than 0.5%, and all the other are Al.
A preparation method for wheel hub dedicated aluminium alloy ingot, comprises the following steps:
(1) melt: aluminum feedstock and magnesium, silicon composition and insulating covering agent are melted to 700 ~ 720 DEG C in smelting furnace, then other alloying constituents except aluminium, magnesium, silicon are added, continue to be warming up to 740 ~ 750 DEG C, after alloying element all melts, obtain molten aluminium alloy;
(2) refining: the temperature of molten aluminium alloy is adjusted to 720 ~ 730 DEG C, adds refining agent and carries out refining treatment, be then warming up to 750-760 DEG C, passes into argon gas and carries out further refinery by de-gassing, skim after refining;
(3) leave standstill: the molten aluminium alloy after refining is left standstill, treats that molten aluminium alloy temperature is down to 690 ~ 710 DEG C;
(4) ingot casting: the molten aluminium alloy after step (3) process is carried out shape casting by casting machine, in castingprocesses, casting speed controls at 70 ~ 75mm/min, water pressure of cooling water controls at 0.09 ~ 0.14MPa, is finally cast as diameter and is 45 ~ 55cm, is highly the aluminum alloy ingot finished product of 25 ~ 30cm.
Aluminum alloy ingot of the present invention, Ti, Zr, Er, Sr element is added in the process of casting, and be aided with the synergy of other elements such as Si, Mn, Cr, Mg, Sn, Cu, rotten and refining effect can be played to aluminum alloy organization, make the average grain size at each position of aluminum alloy organization more tiny, distribute evenly each, thus improve the mechanical property of aluminium alloy, for the mechanical property improving aluminium alloy wheel hub provides guarantee.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described, but protection scope of the present invention and range of application are not limited to following examples:
Embodiment 1
Wheel hub dedicated aluminium alloy ingot, the mass percent of each composition is respectively: Si1.7%, Mn0.12%, Cr0.08%, Mg2.5%, Cu0.2%, Zn0.2%, Ti0.6%, Sn0.18%, Zr0.15%, Er0.15%, Sr0.15%, other metals and nonmetallic impurity element total amount are no more than 0.5%, and all the other are Al.
The preparation method of above-mentioned wheel hub dedicated aluminium alloy ingot, comprises the following steps:
(1) melt: aluminum feedstock and magnesium, silicon composition and insulating covering agent are melted to 700 ~ 720 DEG C in smelting furnace, then other alloying constituents except aluminium, magnesium, silicon are added, continue to be warming up to 740 ~ 750 DEG C, after alloying element all melts, obtain molten aluminium alloy;
(2) refining: the temperature of molten aluminium alloy is adjusted to 720 ~ 730 DEG C, adds refining agent and carries out refining treatment, be then warming up to 750-760 DEG C, passes into argon gas and carries out further refinery by de-gassing, skim after refining;
(3) leave standstill: the molten aluminium alloy after refining is left standstill, treats that molten aluminium alloy temperature is down to 690 ~ 710 DEG C;
(4) ingot casting: the molten aluminium alloy after step (3) process is carried out shape casting by casting machine, in castingprocesses, casting speed controls at 70 ~ 75mm/min, water pressure of cooling water controls at 0.09 ~ 0.14MPa, is finally cast as diameter and is 45 ~ 55cm, is highly the aluminum alloy ingot finished product of 25 ~ 30cm.
Adopt above-mentioned aluminum alloy ingot, manufacture aluminium alloy wheel hub by the low pressure casting method of routine, the aluminium alloy wheel hub finished product obtained, Main Mechanical is at ambient temperature: tensile strength is 368MPa, and yield strength is 297MPa, and unit elongation is 15.2%.
Embodiment 2
Wheel hub dedicated aluminium alloy ingot, the mass percent of each composition is respectively: Si1.2%, Mn0.05%, Cr0.05%, Mg2.0%, Cu0.1%, Zn0.1%, Ti0.3%, Sn0.09%, Zr0.1%, Er0.1%, Sr0.1%, other metals and nonmetallic impurity element total amount are no more than 0.5%, and all the other are Al.
The preparation method of above-mentioned wheel hub dedicated aluminium alloy ingot, comprises the following steps:
(1) melt: aluminum feedstock and magnesium, silicon composition and insulating covering agent are melted to 700 ~ 720 DEG C in smelting furnace, then other alloying constituents except aluminium, magnesium, silicon are added, continue to be warming up to 740 ~ 750 DEG C, after alloying element all melts, obtain molten aluminium alloy;
(2) refining: the temperature of molten aluminium alloy is adjusted to 720 ~ 730 DEG C, adds refining agent and carries out refining treatment, be then warming up to 750-760 DEG C, passes into argon gas and carries out further refinery by de-gassing, skim after refining;
(3) leave standstill: the molten aluminium alloy after refining is left standstill, treats that molten aluminium alloy temperature is down to 690 ~ 710 DEG C;
(4) ingot casting: the molten aluminium alloy after step (3) process is carried out shape casting by casting machine, in castingprocesses, casting speed controls at 70 ~ 75mm/min, water pressure of cooling water controls at 0.09 ~ 0.14MPa, is finally cast as diameter and is 45 ~ 55cm, is highly the aluminum alloy ingot finished product of 25 ~ 30cm.
Adopt above-mentioned aluminum alloy ingot, manufacture aluminium alloy wheel hub by the low pressure casting method of routine, the aluminium alloy wheel hub finished product obtained, Main Mechanical is at ambient temperature: tensile strength is 321MPa, and yield strength is 240MPa, and unit elongation is 14.1%.
Embodiment 3
Wheel hub dedicated aluminium alloy ingot, the mass percent of each composition is respectively: Si2.0%, Mn0.2%, Cr0.1%, Mg2.8%, Cu0.3%, Zn0.3%, Ti0.8%, Sn0.25%, Zr0.2%, Er0.2%, Sr0.2%, other metals and nonmetallic impurity element total amount are no more than 0.5%, and all the other are Al.
The preparation method of above-mentioned wheel hub dedicated aluminium alloy ingot, comprises the following steps:
(1) melt: aluminum feedstock and magnesium, silicon composition and insulating covering agent are melted to 700 ~ 720 DEG C in smelting furnace, then other alloying constituents except aluminium, magnesium, silicon are added, continue to be warming up to 740 ~ 750 DEG C, after alloying element all melts, obtain molten aluminium alloy;
(2) refining: the temperature of molten aluminium alloy is adjusted to 720 ~ 730 DEG C, adds refining agent and carries out refining treatment, be then warming up to 750-760 DEG C, passes into argon gas and carries out further refinery by de-gassing, skim after refining;
(3) leave standstill: the molten aluminium alloy after refining is left standstill, treats that molten aluminium alloy temperature is down to 690 ~ 710 DEG C;
(4) ingot casting: the molten aluminium alloy after step (3) process is carried out shape casting by casting machine, in castingprocesses, casting speed controls at 70 ~ 75mm/min, water pressure of cooling water controls at 0.09 ~ 0.14MPa, is finally cast as diameter and is 45 ~ 55cm, is highly the aluminum alloy ingot finished product of 25 ~ 30cm.
Adopt above-mentioned aluminum alloy ingot, manufacture aluminium alloy wheel hub by the low pressure casting method of routine, the aluminium alloy wheel hub finished product obtained, Main Mechanical is at ambient temperature: tensile strength is 365MPa, and yield strength is 296MPa, and unit elongation is 15.1%.
Claims (3)
1. a wheel hub dedicated aluminium alloy ingot, is characterized in that:
In described aluminum alloy ingot, the mass percent of each composition is respectively: Si1.2 ~ 2.0%, Mn0.05 ~ 0.2%, Cr0.05 ~ 0.1%, Mg2.0 ~ 2.8%, Cu0.1 ~ 0.3%, Zn0.1 ~ 0.3%, Ti0.3 ~ 0.8%, Sn0.09 ~ 0.25%, Zr0.1 ~ 0.2%, Er0.1 ~ 0.2%, Sr0.1 ~ 0.2%, other metals and nonmetallic impurity element total amount are no more than 0.5%, and all the other are Al.
2. wheel hub dedicated aluminium alloy ingot according to claim 1, is characterized in that:
In described aluminum alloy ingot, the mass percent of each composition is respectively: Si1.7%, Mn0.12%, Cr0.08%, Mg2.5%, Cu0.2%, Zn0.2%, Ti0.6%, Sn0.18%, Zr0.15%, Er0.15%, Sr0.15%, other metals and nonmetallic impurity element total amount are no more than 0.5%, and all the other are Al.
3. the preparation method of wheel hub dedicated aluminium alloy ingot according to claim 1 and 2, is characterized in that comprising the following steps:
(1) melt: aluminum feedstock and magnesium, silicon composition and insulating covering agent are melted to 700 ~ 720 DEG C in smelting furnace, then other alloying constituents except aluminium, magnesium, silicon are added, continue to be warming up to 740 ~ 750 DEG C, after alloying element all melts, obtain molten aluminium alloy;
(2) refining: the temperature of molten aluminium alloy is adjusted to 720 ~ 730 DEG C, adds refining agent and carries out refining treatment, be then warming up to 750-760 DEG C, passes into argon gas and carries out further refinery by de-gassing, skim after refining;
(3) leave standstill: the molten aluminium alloy after refining is left standstill, treats that molten aluminium alloy temperature is down to 690 ~ 710 DEG C;
(4) ingot casting: the molten aluminium alloy after step (3) process is carried out shape casting by casting machine, in castingprocesses, casting speed controls at 70 ~ 75mm/min, water pressure of cooling water controls at 0.09 ~ 0.14MPa, is finally cast as diameter and is 45 ~ 55cm, is highly the aluminum alloy ingot finished product of 25 ~ 30cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510953857.XA CN105506411A (en) | 2015-12-18 | 2015-12-18 | Special aluminum alloy ingot for wheel hub and preparation method of aluminum alloy ingot |
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| CN201510953857.XA CN105506411A (en) | 2015-12-18 | 2015-12-18 | Special aluminum alloy ingot for wheel hub and preparation method of aluminum alloy ingot |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106111917A (en) * | 2016-06-24 | 2016-11-16 | 芜湖黄燕实业有限公司 | High intensity wheel hub and preparation method thereof |
| CN108441719A (en) * | 2018-04-11 | 2018-08-24 | 益阳仪纬科技有限公司 | Aluminum alloy for automobile wheel hub casting rod and preparation method thereof |
| CN111683765A (en) * | 2018-03-01 | 2020-09-18 | 诺尔斯海德公司 | Casting method |
| WO2022156075A1 (en) * | 2021-01-19 | 2022-07-28 | 江苏大学 | Automobile hub aluminum alloy capable of being subjected to spin casting and rotary forging and preparation method therefor, and automobile hub and manufacturing method therefor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996025528A1 (en) * | 1995-02-16 | 1996-08-22 | Gibbs Die Casting Aluminium Corporation | Aluminum alloys for die casting |
| CN102312135A (en) * | 2010-06-30 | 2012-01-11 | 通用汽车环球科技运作有限责任公司 | Improved y alloy y |
| CN102373352A (en) * | 2010-08-07 | 2012-03-14 | 秦皇岛开发区美铝合金有限公司 | Preparation method of forging aluminum alloy for wheel hub swaging |
| US20140086789A1 (en) * | 2012-09-27 | 2014-03-27 | Honda Motor Co., Ltd. | Aluminum alloy for vehicle and wheel for motorcycle |
| CN103966478A (en) * | 2013-01-24 | 2014-08-06 | 秦皇岛开发区美铝合金有限公司 | Production technology for aluminium alloy casting rod special for automobile Peugeot hubs |
-
2015
- 2015-12-18 CN CN201510953857.XA patent/CN105506411A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996025528A1 (en) * | 1995-02-16 | 1996-08-22 | Gibbs Die Casting Aluminium Corporation | Aluminum alloys for die casting |
| CN102312135A (en) * | 2010-06-30 | 2012-01-11 | 通用汽车环球科技运作有限责任公司 | Improved y alloy y |
| CN102373352A (en) * | 2010-08-07 | 2012-03-14 | 秦皇岛开发区美铝合金有限公司 | Preparation method of forging aluminum alloy for wheel hub swaging |
| US20140086789A1 (en) * | 2012-09-27 | 2014-03-27 | Honda Motor Co., Ltd. | Aluminum alloy for vehicle and wheel for motorcycle |
| CN103966478A (en) * | 2013-01-24 | 2014-08-06 | 秦皇岛开发区美铝合金有限公司 | Production technology for aluminium alloy casting rod special for automobile Peugeot hubs |
Non-Patent Citations (2)
| Title |
|---|
| 任颂赞等: "《金相分析原理及技术》", 31 August 2013, 上海科学技术文献出版社 * |
| 李念奎等: "《铝合金材料及其热处理技术》", 30 April 2012, 冶金工业出版社 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106111917A (en) * | 2016-06-24 | 2016-11-16 | 芜湖黄燕实业有限公司 | High intensity wheel hub and preparation method thereof |
| CN111683765A (en) * | 2018-03-01 | 2020-09-18 | 诺尔斯海德公司 | Casting method |
| CN108441719A (en) * | 2018-04-11 | 2018-08-24 | 益阳仪纬科技有限公司 | Aluminum alloy for automobile wheel hub casting rod and preparation method thereof |
| WO2022156075A1 (en) * | 2021-01-19 | 2022-07-28 | 江苏大学 | Automobile hub aluminum alloy capable of being subjected to spin casting and rotary forging and preparation method therefor, and automobile hub and manufacturing method therefor |
| GB2614215A (en) * | 2021-01-19 | 2023-06-28 | Univ Jiangsu | Automobile hub aluminum alloy capable of being subjected to spin casting and rotary forging and preparation method therefor, and automobile hub and |
| GB2614215B (en) * | 2021-01-19 | 2023-11-01 | Univ Jiangsu | Manufacturing method of automobile wheel hub aluminium alloy capable of undergoing casting and spinning, and forging and spinning |
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