JPS6254854B2 - - Google Patents
Info
- Publication number
- JPS6254854B2 JPS6254854B2 JP10529680A JP10529680A JPS6254854B2 JP S6254854 B2 JPS6254854 B2 JP S6254854B2 JP 10529680 A JP10529680 A JP 10529680A JP 10529680 A JP10529680 A JP 10529680A JP S6254854 B2 JPS6254854 B2 JP S6254854B2
- Authority
- JP
- Japan
- Prior art keywords
- silicon
- alloy
- present
- vibration
- primary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229910052710 silicon Inorganic materials 0.000 claims description 28
- 239000010703 silicon Substances 0.000 claims description 28
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 26
- 238000013016 damping Methods 0.000 description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 5
- 229910021364 Al-Si alloy Inorganic materials 0.000 description 5
- 230000005496 eutectics Effects 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
Landscapes
- Heat Treatment Of Nonferrous Metals Or Alloys (AREA)
- Vibration Prevention Devices (AREA)
Description
【発明の詳細な説明】
本発明は防振性アルミニウム合金に関するもの
である。多くの機械設備で、それ自体の可動部で
発生した振動が他の部分に伝達されたり、又は外
部の振動が当該機械設備に伝達されたりして、当
該機械設備の性能を低下させ、騒音の発生を招く
ことがある。この対策としては、機械設備の適切
な設計に加えて、振動を発生しない、又は振動を
吸収して他の部分に振動を伝達させない防振性の
すぐれた材料の使用が重要である。防振性のすぐ
れた金属材料としては、純マグネシウムや超塑性
亜鉛合金等が知られている。しかし防振性のすぐ
れたアルミニウム合金は未だ知られていない。
本発明は防振性のすぐれたアルミニウム合金を
提供するものである。本発明に係るアルミニウム
合金は、珪素20〜35％を含み、かつ初晶珪素の平
均直径が100μｍ以上であるアルミニウムー珪素
鋳造合金である。本発明について詳細に説明する
と、本発明に係る合金は過共晶のAl−Si合金で、
組織的には初晶として晶出する粗い珪素および共
晶（共晶として晶出するAl−Si固溶体および共晶
珪素。共晶珪素は初晶珪素よりもはるかに細かい
ので、両者は顕微鏡下で溶易に識別できる）から
成る。一般に過共晶のAl−Si合金では、初晶珪素
の大きさはできるだけ細かく（通常、平均直径で
10〜40μｍ）するのが常識であり、そのため鋳造
に際しては初晶珪素微細化剤の添加や急冷凝固等
が行なわれる。しかし本発明の合金においては、
初晶珪素は著るしく大きく、平均直径で100μｍ
以上であることが必要である。本発明の合金にお
いては、珪素の含有量が同一ならば、一般に初晶
珪素の大きさが大きいほど合金の防振性がすぐれ
ている。また本発明に係る合金の防振性は珪素の
含有量にも依存し、珪素の含有量が多いほど防振
性にすぐれているので、珪素含有量は20％以上で
あることが必要である。しかし珪素量が多くなる
と合金の硬さが増す一方で、引張り強さおよびヤ
ング率が低下する。また、珪素量が多くなり、初
晶珪素の量が増すほど合金の幾械加工性（切削
性）が低下する。さらに珪素量が多くなると、合
金の溶解温度が上昇して、溶解処理が困難になる
という問題もある。従つて、これらの点を総合す
ると珪素含有量の上限は35％とすべきであり、好
ましくは30％である。
本発明に係る合金を製造するには、所定量の珪
素を含むAl−Si合金の溶湯を準備し、初晶珪素を
微細化する燐処理等を行なわずに鋳型に注入して
徐冷させればよい。またAl−Si合金中に銅その他
の合金元素が存在すると、機械的性質は向上する
が、防振性が低下する。従つて本発明合金中には
珪素以外の合金元素はできるだけ存在させないの
が好ましい。
本発明に係るAl−Si合金は、通常のアルミニウ
ム合金の２倍以上の防振性を有している。また珪
素含量および初晶珪素の大きさを選択することに
より、防振性がすぐれているとされている純マグ
ネシウムや超塑性亜鉛合金よりも大きな防振性を
付与することもできる。
以下に実施例により本発明をさらに詳細に説明
するが、本発明はこれらの実施例に限定されるも
のではない。
実施例
JIS舟金型を用いてアルミニウム−珪素合金を
鋳造した。これから長さ120mm、幅７mm、厚さ１
mmの試験片を切削加工により製作し、横振動形内
部摩擦測定装置を用いてその内部摩擦を測定し
た。即ち、この試験片を両端からそれぞれ26.8mm
の位置で吊り、加振器を用いて試験片の共振周波
数で振幅１×10-4で振動させたのち、自由減衰さ
せ、この自由減衰時の対数減衰率（δ）から、次
式により内部摩擦（Q-1）を求めた。
δ＝１／ｎln（Ao/An）＝πQ-1
ここに
Ao＝共振々幅
An＝自由減衰時におけるｎ回目の振動の振幅
ｎ＝自由減衰時における振動の回数
結果を第１表に示す。なお、初晶珪素の平均径
は、顕微鏡下で初晶珪素の長径と短径とを測定
し、その算術平均として求めた。
【表】DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anti-vibration aluminum alloy. In many machines, vibrations generated by their own moving parts are transmitted to other parts, or external vibrations are transmitted to the machine, reducing the performance of the machine and causing noise. This may lead to an outbreak. As a countermeasure for this, in addition to appropriate design of mechanical equipment, it is important to use materials with excellent vibration-proofing properties that do not generate vibrations or absorb vibrations and prevent vibrations from being transmitted to other parts. Pure magnesium, superplastic zinc alloy, and the like are known as metal materials with excellent vibration-proof properties. However, an aluminum alloy with excellent anti-vibration properties is not yet known. The present invention provides an aluminum alloy with excellent vibration damping properties. The aluminum alloy according to the present invention is an aluminum-silicon casting alloy containing 20 to 35% silicon and having primary silicon having an average diameter of 100 μm or more. To explain the present invention in detail, the alloy according to the present invention is a hypereutectic Al-Si alloy,
Texturally, coarse silicon crystallizes as a primary crystal and eutectic (Al-Si solid solution and eutectic silicon crystallizes as a eutectic. Because eutectic silicon is much finer than primary silicon, both can be seen under a microscope. (easily identifiable). In general, in hypereutectic Al-Si alloys, the size of the primary silicon is as fine as possible (usually the average diameter).
It is common knowledge that the thickness is 10 to 40 μm), and therefore, during casting, addition of a primary silicon refining agent and rapid solidification are performed. However, in the alloy of the present invention,
Primary silicon is significantly large, with an average diameter of 100 μm.
It is necessary that it is above. In the alloy of the present invention, if the silicon content is the same, generally the larger the size of primary silicon, the better the vibration damping properties of the alloy. Furthermore, the vibration-proofing properties of the alloy according to the present invention also depend on the silicon content, and the higher the silicon content, the better the vibration-proofing properties, so the silicon content needs to be 20% or more. . However, as the amount of silicon increases, the hardness of the alloy increases, while the tensile strength and Young's modulus decrease. Further, as the amount of silicon increases and the amount of primary silicon increases, the geometric machinability (cutting ability) of the alloy decreases. Furthermore, when the amount of silicon increases, the melting temperature of the alloy increases, making melting treatment difficult. Therefore, taking all these points into consideration, the upper limit of the silicon content should be 35%, preferably 30%. To manufacture the alloy according to the present invention, a molten Al-Si alloy containing a predetermined amount of silicon is prepared, poured into a mold, and allowed to cool slowly without performing phosphorus treatment to refine the primary silicon. Bye. Further, when copper or other alloying elements are present in the Al-Si alloy, mechanical properties are improved, but vibration damping properties are reduced. Therefore, it is preferable that alloying elements other than silicon are not present in the alloy of the present invention as much as possible. The Al-Si alloy according to the present invention has vibration damping properties that are more than twice that of ordinary aluminum alloys. Furthermore, by selecting the silicon content and the size of the primary silicon, it is possible to impart greater vibration damping properties than pure magnesium or superplastic zinc alloys, which are said to have excellent vibration damping properties. EXAMPLES The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited to these Examples. Example An aluminum-silicon alloy was cast using a JIS boat mold. From now on, length 120mm, width 7mm, thickness 1
A specimen of mm in diameter was manufactured by cutting, and its internal friction was measured using a transverse vibration type internal friction measuring device. That is, this test piece is 26.8 mm from both ends.
After suspending the test piece at the position of Friction (Q -1 ) was calculated. δ=1/nln(Ao/An)=πQ -1 where Ao=resonance width An=amplitude of n-th vibration during free decay n=number of vibrations during free decay The results are shown in Table 1. Note that the average diameter of primary silicon was determined by measuring the major axis and minor axis of primary silicon under a microscope, and was determined as the arithmetic mean of the measurements. 【table】
Claims (1)
径が100μｍ以上であることを特徴とする防振性
アルミニウム−珪素鋳造合金。1. A vibration-proof aluminum-silicon casting alloy containing 20 to 35% silicon and having an average diameter of primary silicon of 100 μm or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10529680A JPS5732349A (en) | 1980-07-31 | 1980-07-31 | Damping aluminum alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10529680A JPS5732349A (en) | 1980-07-31 | 1980-07-31 | Damping aluminum alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5732349A JPS5732349A (en) | 1982-02-22 |
| JPS6254854B2 true JPS6254854B2 (en) | 1987-11-17 |
Family
ID=14403720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10529680A Granted JPS5732349A (en) | 1980-07-31 | 1980-07-31 | Damping aluminum alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5732349A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0744754B2 (en) * | 1988-04-07 | 1995-05-15 | 三菱電機株式会社 | Diaphragm for audio equipment |
| JPH03102089U (en) * | 1990-02-07 | 1991-10-24 | ||
| JPH0673479A (en) * | 1992-05-06 | 1994-03-15 | Honda Motor Co Ltd | High strength and high toughness al alloy |
-
1980
- 1980-07-31 JP JP10529680A patent/JPS5732349A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5732349A (en) | 1982-02-22 |
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