CN101760657A - Composite toughening technology of cast aluminum alloy wheel hub - Google Patents
Composite toughening technology of cast aluminum alloy wheel hub Download PDFInfo
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- CN101760657A CN101760657A CN200810172148A CN200810172148A CN101760657A CN 101760657 A CN101760657 A CN 101760657A CN 200810172148 A CN200810172148 A CN 200810172148A CN 200810172148 A CN200810172148 A CN 200810172148A CN 101760657 A CN101760657 A CN 101760657A
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Abstract
The invention relates to a composite toughening technology of a cast aluminum alloy wheel hub, comprising the following steps of: melting aluminium alloy melt into an aluminum alloy solution; adding Al-Sr intermediate alloy, mischmetal (Re) and Al-Zr intermediate alloy to the solution when the solution temperature reaches 710-730 DEG C under the condition of stirring to carry out composite modifying and refining treatment; and meanwhile, blowing nitrogen into the solution to remove harmful gas out of the solution. The technology not only can reduce alloy getter and improve the flowability of an aluminum solution, but also can ensure that the tissues and the performance of castings doe not fluctuate, thereby improving the quality of products.
Description
Technical field:
The present invention relates to the composite toughening technology of cast aluminum alloy wheel hub.
Background technology:
For the high-performance aluminium alloy automotive wheel, only improve aluminium liquid purity level not enough by purifying treatment, also need to handle to eliminate the influence of impurity element and thick crystal structure etc. in the aluminium alloy by rotten and grain refining.Wherein:
Rotten mainly is at the eutectic Si in the aluminium alloy, when not rotten, eutectic Si occurs with bodkin shape form, these thick spicules can cause aluminium alloy and crack, thereby make the mechanical properties decrease of aluminium alloy, the processing of going bad can change pattern and the size of eutectic Si, makes eutectic Si be transformed into fine-fibered shape or synusia shape by the bodkin shape.The general Sr that adopts is rotten in the industry at present, and Sr is better to the eutectiferous effect of Al-Si, can make eutectic structure be fibrous, but the existence of Sr promotes that aluminium alloy is air-breathing, and pin hole proneness is big, and rotten back aluminium liquid flowability descends to some extent.
Thinning processing not only can crystal grain thinning, makes dense structure, and can alleviate the hot tearing and the segregation tendency of foundry goods, reduces void content, thereby significantly improves the mechanical property of aluminum alloy casting.General Al-Ti alloy or the Al-Ti-B alloy grain fining agent of using in the industry.But the phase composite of Al-Ti-B fining agent, form and distribute to the structure of molten aluminium alloy, solidify and factor such as solid-state processing extremely responsive, make tissue morphology and thinning effect bigger difference occur, promptly under identical alloying constituent and casting technique condition, because the difference of the micro-auxiliary material weave construction that adopts makes the tissue of aluminum products and performance the fluctuation that is difficult to expect occur, is difficult to control the quality of production of aluminum products.
Summary of the invention:
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of composite toughening technology of cast aluminum alloy wheel hub is provided, it is composite inoculating+composite refining, it is air-breathing that it not only can reduce alloy, improve aluminium liquid flowability, and can also guarantee that fluctuation does not appear in THE STRUCTURE OF CASTINGS and performance, improves the quality of product.
Composite toughening technology according to cast aluminum alloy wheel hub provided by the invention, comprise the aluminium alloy melt is fused into molten aluminium alloy, reach at melt temperature and in liquation, add Al-Sr master alloy, mishmetal (Re) and Al-Zr master alloy under 710～730 ℃ and the stirring condition and carry out composite inoculating and thinning processing; Simultaneously, be blown into nitrogen and remove obnoxious flavour in the liquation.
In addition, the present invention also has following attached technical characterictic:
The add-on of described Al-Sr master alloy, mishmetal (Re) and Al-Zr master alloy is respectively 0.01%～0.018%, 0.1%～0.3% and 0.01%～0.018% of molten aluminium alloy, and the time of composite inoculating and thinning processing is 30～40min.
Described Al-Zr master alloy mainly comprises Al-Zr-Ti-B and Al-Zr-B-O.
The flow of described nitrogen is 1.5～3 cubic metres/hour, and jetting pressure is 0.25～0.35mpa.
The add-on of described Al-Sr master alloy, mishmetal (Re) and Al-Zr master alloy is respectively 0.015%, 0.2% and 0.015% of molten aluminium alloy.
According to the composite toughening technology of cast aluminum alloy wheel hub provided by the invention, have following advantage with respect to prior art:
At first, the present invention has adopted the composite inoculating technology, is about to the Al-Sr master alloy and is in the same place with the advantages of mishmetal (Re), realizes the rotten of molten aluminium alloy.Acting in conjunction by two kinds of alterants, the solid-liquid phase line temperature head is reduced, reduce the mushy freezing trend of alloy, and can also reduce the surface tension of alloy liquation, make the mobile raising of aluminium alloy solution, viscosity reduces, and helps inclusion and gas purging, and is better with the Sr modification effect than simple.
Secondly, because mishmetal (Re) also has refined crystalline strengthening in as alterant effect, therefore, it can also carry out composite refining to aluminium alloy solution with the Al-Zr master alloy and handle, handle by this composite refining, can avoid the tissue and the performance of aluminium alloy fluctuation to occur, thereby improve the quality of product.
Embodiment:
Composite toughening technology according to cast aluminum alloy wheel hub provided by the invention, comprise the aluminium alloy melt is fused into molten aluminium alloy, reach at melt temperature and in liquation, add Al-Sr master alloy, mishmetal (Re) and Al-Zr master alloy under 710～730 ℃ and the stirring condition and carry out composite inoculating and thinning processing; Simultaneously, be blown into nitrogen and remove obnoxious flavour in the liquation, wherein, the flow of nitrogen is 1.5～3 cubic metres/hour, and jetting pressure is 0.25～0.35mpa.
As mentioned above, because mishmetal (Re) has well long-lasting and remelting stability, air-breathing proneness is little, and is pollution-free, adds easy, the no corrosive nature of technology, can improve aluminium liquid flowability, has the effect that purifies aluminium liquid simultaneously concurrently.Therefore for obtaining modification effect preferably, both to reduce alloy air-breathing in order to reach, and can improve the effect of aluminium liquid flowability again, this project has adopted the composite inoculating technology, promptly,, realize the rotten of aluminium alloy solution in conjunction with both advantages by the acting in conjunction of Al-Sr master alloy and mishmetal (Re).
Simultaneously, the refining effect of mishmetal (Re) also causes our attention, and the strengthening effect of rare earth in aluminium alloy mainly contains refined crystalline strengthening, limited solid molten the reinforcement and second the strengthening mutually etc. of rare earth compound.And Al-Zr master alloy fining agent (mainly comprising Al-Zr-Ti-B and Al-Zr-B-O etc.) can play the effect of refinement and microalloying, can also synthesize enhanced granule for alloy provides original position, further improves alloy property.Therefore, in order to obtain best grain refining effect, we have gathered the advantage of two kinds of fining agents, have adopted the composite refining technology, promptly add mishmetal (Re) and Al-Zr master alloy in aluminium alloy solution, realize the refinement and the microalloying of aluminium alloy solution.
As above, in composite inoculating and thinning process, the add-on of Al-Sr master alloy is 0.01%～0.018%, and optimum value is 0.15%; The add-on of mishmetal (Re) is 0.1%～0.3%, and optimum value is 0.2%; The add-on of Al-Zr master alloy is 0.01%～0.018%, and optimum value is 0.015%; The time of composite inoculating and thinning processing is 30～40min.
Claims (5)
1. the composite toughening technology of a cast aluminum alloy wheel hub, comprise the aluminium alloy melt is fused into molten aluminium alloy, it is characterized in that: reach at melt temperature and in liquation, add Al-Sr master alloy, mishmetal (Re) and Al-Zr master alloy under 710～730 ℃ and the stirring condition and carry out composite inoculating and thinning processing; Simultaneously, be blown into nitrogen and remove obnoxious flavour in the liquation.
2. the composite toughening technology of cast aluminum alloy wheel hub according to claim 1, it is characterized in that: the add-on of described Al-Sr master alloy, mishmetal (Re) and Al-Zr master alloy is respectively 0.01%～0.018%, 0.1%～0.3% and 0.01%～0.018% of molten aluminium alloy, and the time of composite inoculating and thinning processing is 30～40min.
3. the composite toughening technology of cast aluminum alloy wheel hub as claimed in claim 1 or 2, it is characterized in that: described Al-Zr master alloy mainly comprises Al-Zr-Ti-B and Al-Zr-B-O.
4. the composite toughening technology of cast aluminum alloy wheel hub as claimed in claim 1 or 2, it is characterized in that: the flow of described nitrogen is 1.5～3 cubic metres/hour, jetting pressure is 0.25～0.35mpa.
5. the composite toughening technology of cast aluminum alloy wheel hub as claimed in claim 1 or 2, it is characterized in that: the add-on of described Al-Sr master alloy, mishmetal (Re) and Al-Zr master alloy is respectively 0.015%, 0.2% and 0.015% of molten aluminium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810172148A CN101760657A (en) | 2008-11-12 | 2008-11-12 | Composite toughening technology of cast aluminum alloy wheel hub |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810172148A CN101760657A (en) | 2008-11-12 | 2008-11-12 | Composite toughening technology of cast aluminum alloy wheel hub |
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| CN101760657A true CN101760657A (en) | 2010-06-30 |
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| CN200810172148A Pending CN101760657A (en) | 2008-11-12 | 2008-11-12 | Composite toughening technology of cast aluminum alloy wheel hub |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296216A (en) * | 2011-08-24 | 2011-12-28 | 吴江市精工铝字制造厂 | Aluminum alloy for automobile wheel hub |
| CN102643999A (en) * | 2012-05-07 | 2012-08-22 | 镇江汇通金属成型有限公司 | Wear resistant zinc alloy degassing sundries-discharging refining method |
| CN102719684A (en) * | 2012-07-06 | 2012-10-10 | 青铜峡铝业股份有限公司 | Method for improving internal crystallization of aluminum products |
| CN106167866A (en) * | 2016-08-24 | 2016-11-30 | 北京航空航天大学 | Fining modifier that a kind of silumin alloy rare earth-zirconium is compound and metamorphism treatment method |
| CN111304474A (en) * | 2020-03-30 | 2020-06-19 | 浙江今飞凯达轮毂股份有限公司 | Al-Ti-B-Sr-RE intermediate alloy and preparation method thereof |
-
2008
- 2008-11-12 CN CN200810172148A patent/CN101760657A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296216A (en) * | 2011-08-24 | 2011-12-28 | 吴江市精工铝字制造厂 | Aluminum alloy for automobile wheel hub |
| CN102643999A (en) * | 2012-05-07 | 2012-08-22 | 镇江汇通金属成型有限公司 | Wear resistant zinc alloy degassing sundries-discharging refining method |
| CN102719684A (en) * | 2012-07-06 | 2012-10-10 | 青铜峡铝业股份有限公司 | Method for improving internal crystallization of aluminum products |
| CN106167866A (en) * | 2016-08-24 | 2016-11-30 | 北京航空航天大学 | Fining modifier that a kind of silumin alloy rare earth-zirconium is compound and metamorphism treatment method |
| CN111304474A (en) * | 2020-03-30 | 2020-06-19 | 浙江今飞凯达轮毂股份有限公司 | Al-Ti-B-Sr-RE intermediate alloy and preparation method thereof |
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Application publication date: 20100630 |