JPS61170537A - Aluminum alloy having high silicon content for cylinder of videotape recorder - Google Patents
Aluminum alloy having high silicon content for cylinder of videotape recorderInfo
- Publication number
- JPS61170537A JPS61170537A JP908185A JP908185A JPS61170537A JP S61170537 A JPS61170537 A JP S61170537A JP 908185 A JP908185 A JP 908185A JP 908185 A JP908185 A JP 908185A JP S61170537 A JPS61170537 A JP S61170537A
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- cylinder
- aluminum alloy
- casting
- silicon content
- 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.)
- Pending
Links
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明はＶＴＲシリンダ用高３ｉ含有Ａｌ合金に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a high 3i content Al alloy for VTR cylinders.
従来、ＶＴＲシリンダに用いられる合金はその殆どがア
ルミニウム合金である。この理由は軽量高強度、高耐摩
耗性であることが要求されるためであシ、一般には高３
ｉ鋳造用Ａｌ合金と時効型のＡｌ合金とが用いられてい
る。特にテープの高速走行のためシリンダの耐摩耗性は
重要でこのためには高Ｓ １−Ａｌ合金が適している。Conventionally, most of the alloys used for VTR cylinders are aluminum alloys. The reason for this is that it is required to be lightweight, high strength, and high abrasion resistance, and generally high 3
An i-casting Al alloy and an aging type Al alloy are used. In particular, the wear resistance of the cylinder is important because the tape runs at high speed, and a high S1-Al alloy is suitable for this purpose.
しかし高３ｉ含有合金は加工性が悪いため鋳造で作られ
るのが書違であるが鋳造欠陥に起因する問題が多く新材
料が要求されている。これに対処するために時分５１３
−２０２４３に提案した８〜１５％ＳＬ含有加工用Ａ／
、合金が発明されたが、この合金は熱間加工性にすぐれ
るものであり冷間加工性に問題があった。However, high 3i-containing alloys have poor workability, so it is a mistake to make them by casting, but there are many problems caused by casting defects, and new materials are required. Time 513 to deal with this
-8-15% SL content processing A/ proposed for 20243
, an alloy was invented, but this alloy had excellent hot workability but had problems with cold workability.
本発明は時分５３−２０２４３で発明した合金に冷間加
工性を付与することを目的とするものである。The object of the present invention is to impart cold workability to the alloy invented in No. 53-20243.
本発明は銅とマグネシウムを含有し、シリコンとアルミ
ニウムの共晶組織を有するアルミニウム合金を急冷鋳造
したものを均質化焼鈍することによって冷間鋳造を可能
にしたものである。The present invention enables cold casting by homogenizing and annealing a rapidly cast aluminum alloy containing copper and magnesium and having a eutectic structure of silicon and aluminum.
Ａｌ−８１合金の鋳造組織はＡ４初晶の周囲にＳｉがネ
ットワーク状に晶出するため加工性が悪いことは周知の
事実である。このネットワーク状に晶出するＳｉをなく
するために冷却速度を大きくし、Ｓｉ晶を微細にしよう
としたのが時分５３−２０２４３であり、さらにｓｔ、
Ｃｕ、Ｍｇ量を限定し、鋳造機熱間押出しを施すことに
よってネットワーク状シリコンを分断することによって
冷間加工性を付与した合金が発明された（時分５７−７
２１７）Ｌかし鋳造機熱間押出しを加えたのでは、コス
トが大巾に増加し、家庭用゛電化製品であるＶＴＲには
使用しきれない。このような問題点を解決するために本
発明者は鋳造条件と均質化焼鈍について詳細に検討した
結果急冷と均質化焼鈍の組合せによってＶＴＲシリンダ
の冷間鍛造が可能となった。It is a well-known fact that the cast structure of Al-81 alloy has poor workability because Si crystallizes in a network around A4 primary crystals. Time 53-20243 attempted to increase the cooling rate and make the Si crystals finer in order to eliminate Si that crystallizes in a network shape.
An alloy was invented in which the amount of Cu and Mg was limited and the network-like silicon was divided by hot extrusion using a casting machine, thereby imparting cold workability (57-7).
217) If hot extrusion is added to the L-shaped casting machine, the cost will increase significantly, and it cannot be used for VTRs, which are household appliances. In order to solve these problems, the inventor of the present invention made a detailed study of casting conditions and homogenization annealing, and as a result, it became possible to cold forge a VTR cylinder by combining rapid cooling and homogenization annealing.
すなわち、Ａ１−３ｉ合金の鋳造組織は冷却速度の増加
によシ、ネットワーク状Ｓｉが針状Ｓ１となり、さらに
は微細な粒状Ｓｉとなる。このような変化の過程におい
て針状８１の大きさが５０μｍ以下になると４５０〜５
２０Ｃで２０時間以上の焼鈍を行えば針状３ｉは球状化
しＶＴＲシリンダの冷間鍛造が可能なことを発明した。That is, as the cooling rate increases, the cast structure of the A1-3i alloy changes from network-like Si to needle-like S1, and further to fine granular Si. In the process of such changes, when the size of the needles 81 becomes 50 μm or less, the size of the needles 81 becomes 450-5
The inventor discovered that by annealing at 20C for 20 hours or more, the needle-shaped 3i becomes spherical, making it possible to cold forge a VTR cylinder.
このような針状３ｉの大きさにするためには鋳造直径が
８０ｗ以下であれば冷却速度は４Ｃ／秒以上となり十分
な３ｉの微細化が可能である。In order to obtain such a size of needle-like 3i, if the casting diameter is 80W or less, the cooling rate is 4C/sec or more, and sufficient refinement of 3i is possible.
以下本発明の実施例を述べる。 Examples of the present invention will be described below.
５ｉ１１重量％、Ｍ ｇ ０．５％、Ｃｕ＆５％残部Ａ
ｌからなるＡｌ合金を直径８０＋ｏ＋φの水冷Ｃｕ鋳型
で連続鋳造した。その結果３ｉ晶は最大４０μｍ穆度の
針状晶が混在する微細粒状晶で、１、これを５００ＣＸ
３０ｈの焼鈍を行なった。かくして得られたＡｌ合金を
ＶＴＲ，シリンダ用鍛造型を用いて冷間鍛造したとζろ
全く割れのない正常な鍛造品が得られた。5i11% by weight, Mg 0.5%, Cu & 5% balance A
An Al alloy consisting of 1 was continuously cast in a water-cooled Cu mold with a diameter of 80+o+φ. As a result, the 3i crystal is a fine granular crystal mixed with needle crystals with a maximum purity of 40 μm.
Annealing was performed for 30 hours. When the Al alloy thus obtained was cold forged using a VTR cylinder forging die, a normal forged product with no cracks was obtained.
Claims (1)
％およびマグネシウムを０．０５〜０．６重量％の範囲
で含有するＡｌ合金であつて、４℃／秒よりも大きい冷
却速度で直径８０ｍｍ以下の丸棒に鋳造され該鋳造後の
合金が４５０〜５１０℃で２０〜１００時間焼鈍される
ことによつて、冷間鍛造法によつて成形可能に形成され
ていることを特徴とするビデオテープレコーダシリンダ
用高珪素含有アルミニウム合金。1. Al alloy containing 10 to 15% by weight of silicon, 1 to 3% by weight of steel, and 0.05 to 0.6% by weight of magnesium, with a cooling rate greater than 4°C/sec. The alloy is cast into a round bar with a diameter of 80 mm or less, and the cast alloy is annealed at 450 to 510°C for 20 to 100 hours, so that it can be formed by cold forging. High silicon content aluminum alloy for videotape recorder cylinders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP908185A JPS61170537A (en) | 1985-01-23 | 1985-01-23 | Aluminum alloy having high silicon content for cylinder of videotape recorder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP908185A JPS61170537A (en) | 1985-01-23 | 1985-01-23 | Aluminum alloy having high silicon content for cylinder of videotape recorder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61170537A true JPS61170537A (en) | 1986-08-01 |
Family
ID=11710664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP908185A Pending JPS61170537A (en) | 1985-01-23 | 1985-01-23 | Aluminum alloy having high silicon content for cylinder of videotape recorder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61170537A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0339454A (en) * | 1989-07-06 | 1991-02-20 | Sumitomo Light Metal Ind Ltd | Production of cast aluminum alloy bar for vtr cylinder |
| JPH0339453A (en) * | 1989-07-06 | 1991-02-20 | Sumitomo Light Metal Ind Ltd | Production of cast aluminum alloy bar for vtr cylinder |
-
1985
- 1985-01-23 JP JP908185A patent/JPS61170537A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0339454A (en) * | 1989-07-06 | 1991-02-20 | Sumitomo Light Metal Ind Ltd | Production of cast aluminum alloy bar for vtr cylinder |
| JPH0339453A (en) * | 1989-07-06 | 1991-02-20 | Sumitomo Light Metal Ind Ltd | Production of cast aluminum alloy bar for vtr cylinder |
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