JP2962453B2 - Manufacturing method of magnesium alloy casting material suitable for semi-solid molding - Google Patents
Manufacturing method of magnesium alloy casting material suitable for semi-solid moldingInfo
- Publication number
- JP2962453B2 JP2962453B2 JP22258693A JP22258693A JP2962453B2 JP 2962453 B2 JP2962453 B2 JP 2962453B2 JP 22258693 A JP22258693 A JP 22258693A JP 22258693 A JP22258693 A JP 22258693A JP 2962453 B2 JP2962453 B2 JP 2962453B2
- Authority
- JP
- Japan
- Prior art keywords
- magnesium alloy
- semi
- casting material
- material suitable
- manufacturing
- 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 - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は半溶融成形に適した微細
等軸晶組織を有するマグネシウム合金鋳造素材の製造方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a magnesium alloy casting material having a fine equiaxed crystal structure suitable for semi-solid molding.
【０００２】[0002]
【従来の技術】従来，半溶融成形に用いる素材として
は，アルミニウム合金を固液共存状態に保持した金属
に機械的な撹拌や電磁的撹拌を施し粒状の金属組織を有
するものが一般には用いられる。2. Description of the Related Art Conventionally, as a material used for semi-solid molding, a metal having a granular metal structure obtained by subjecting a metal in which an aluminum alloy is kept in a solid-liquid coexistence state to mechanical stirring or electromagnetic stirring is generally used. .
【０００３】また，前記に用いた撹拌技術を使用し
ないで微細組織を得る方法として，半溶融成形加工前に
再結晶温度以上の熱間加工と冷間加工を施すことも報告
されている。As a method for obtaining a fine structure without using the stirring technique used above, it has been reported that hot working and cold working at a recrystallization temperature or higher are performed before semi-solid forming.
【０００４】さらに，マグネシウム合金の金属組織
（結晶粒）を微細化する方法として，Ｃ2 Ｃｌ6 を主成
分とするフラックスやＣａＣＮ2 などの結晶粒細化剤を
添加したり，あるいは９００℃以上に一旦過熱処理する
方法が知られている。Further, as a method of refining the metal structure (crystal grains) of a magnesium alloy, a flux containing C 2 Cl 6 as a main component or a grain refiner such as CaCN 2 is added, or 900 ° C. or more. There is known a method of temporarily performing overheating.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら，上記し
たの場合は，素材の組織中に存在する粒状の組織は，
撹拌時に空気やガスを巻き込むために，撹拌速度を十分
に上げることができず，かならずしも細かい組織が得ら
れなかった。また，の場合は，成形法としては繁雑で
ある。さらに，の場合は，マグネシウム合金は極めて
活性であるため溶解時に酸化，窒化が激しく溶湯の取扱
いが大変であり，鋳造温度を７００℃以上好ましくは７
２０℃程度以上に保持すること，処理後なるべく早い時
期に鋳造すること，酸化防止に必要なＢｅ量を１０ｐｐ
ｍ以下にすることなどが要求されるため，実用上問題が
多かった。However, in the case described above, the granular structure existing in the structure of the material is
Since air and gas were involved during stirring, the stirring speed could not be increased sufficiently, and a fine structure could not always be obtained. In addition, the case is complicated as a molding method. Further, in the case of (1), since the magnesium alloy is extremely active, oxidation and nitridation are severe during melting and handling of the molten metal is difficult.
Maintain at about 20 ° C or higher, cast as early as possible after processing, and reduce the amount of Be required to prevent oxidation to 10 pp.
m or less, there are many practical problems.
【０００６】本発明は，上記従来の問題点に着目し，空
気などのガスの巻き込み，溶湯の酸化，かつ窒化が非常
に少なく，細かい等軸晶を安定して容易に製造すること
のできる半溶融成形に適したマグネシウム合金鋳造素材
の製造方法を提供することを目的とするものである。The present invention focuses on the above-mentioned conventional problems, and involves a method of producing gas such as air, oxidizing and nitriding of a molten metal very little, and capable of stably and easily producing fine equiaxed crystals. It is an object of the present invention to provide a method for producing a magnesium alloy casting material suitable for melt molding.
【０００７】[0007]
【課題を解決するための手段】このような課題を解決す
るために，本発明に係る半溶融成形に適したマグネシウ
ム合金鋳造素材の製造方法では，液相線温度に対して過
熱度を６０℃未満に保持されたＭｇ−Ａｌ系およびＭｇ
−Ａｌ−Ｚｎ系合金溶湯を０．５℃／ｓ以上の凝固区間
冷却速度で凝固させて微細な等軸晶組織を有したマグネ
シウム合金鋳造材を得るようにした。In order to solve the above-mentioned problems, a method of manufacturing a magnesium alloy casting material suitable for semi-solid molding according to the present invention is to increase the degree of superheat to 60 ° C. with respect to the liquidus temperature. Mg-Al based and Mg held below
-The molten Al-Zn alloy was solidified at a cooling rate in the solidification zone of 0.5 ° C / s or more to obtain a cast magnesium alloy having a fine equiaxed crystal structure.
【０００８】[0008]
【作用】液相線温度に対して過熱度を６０℃以下にする
ことにより，注湯時に生成された結晶核の再溶解を防止
でき，しかも過熱度６０℃以上の温度域において注湯温
度の低下に伴い著しく粗大化する現象を抑制することが
できるため，５０μｍ以下の微細な等軸晶を有するマグ
ネシウム合金の鋳造素材を得ることができる。The reheating of the crystal nuclei generated at the time of pouring can be prevented by setting the degree of superheating to 60 ° C. or less with respect to the liquidus temperature. Since the phenomenon of remarkably coarsening due to the decrease can be suppressed, a magnesium alloy casting material having a fine equiaxed crystal of 50 μm or less can be obtained.
【０００９】[0009]
【実施例】以下に，本発明に係る半溶融成形に適したマ
グネシウム合金鋳造素材の製造方法の具体的実施例を図
面を参照して詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of a method for producing a magnesium alloy casting material suitable for semi-solid molding according to the present invention will be described in detail with reference to the drawings.
【００１０】本発明に係る一実施例としてＭｇ−Ａｌ−
Ｚｎ系合金について述べる。まず，原料を図１に示すよ
うなヒータ２で例えば７２０℃に加熱された鉄製るつぼ
１中で溶解してマグネシウム合金組成（重量％）を下記
のように調整する。 Ａｌ；９％ Ｚｎ；１％ Ｍｎ；０．２％ Ｂｅ；０．００１％ 残部；マグネシウムおよび不可避不純物According to one embodiment of the present invention, Mg-Al-
The Zn-based alloy will be described. First, a raw material is melted in a steel crucible 1 heated to, for example, 720 ° C. by a heater 2 as shown in FIG. 1 to adjust a magnesium alloy composition (% by weight) as follows. Al; 9% Zn; 1% Mn; 0.2% Be; 0.001% balance: magnesium and unavoidable impurities
【００１１】マグネシウム合金溶湯３は極めて活性であ
り，溶解時に空気と接触による酸化や窒化を防止するた
めに，シール材５としてＳＦ6 ＋ＣＯ2 ガスをマグネシ
ウム合金溶湯３上部から吹込みながら行なう。ついで，
鉄製るつぼ１内で液相線温度に対する過熱度を６０℃以
下に保持されたマグネシウム合金溶湯３を柄杓４で汲ん
だ後（図２），０．５℃／ｓ以上の凝固区間冷却速度で
凝固させることが可能な鋳型７中に注湯するのである
（図３）。なお，鋳造に当たり鋳型７に注湯したマグネ
シウム合金溶湯３と鋳型７をともに加振することにより
結晶をより細かくする上でより効果的である。The molten magnesium alloy 3 is extremely active. In order to prevent oxidation or nitridation due to contact with air during melting, SF 6 + CO 2 gas is blown from above the molten magnesium alloy 3 as a sealing material 5. Then
After the molten magnesium alloy 3 whose superheat degree with respect to the liquidus temperature is kept at 60 ° C. or less in the iron crucible 1 is drawn by the ladle 4 (FIG. 2), it is solidified at a solidification section cooling rate of 0.5 ° C./s or more. The molten metal is poured into a mold 7 which can be poured (FIG. 3). It is more effective to make the crystal finer by vibrating both the molten magnesium alloy 3 poured into the mold 7 and the mold 7 in casting.
【００１２】図４は冷却速度が４℃／ｓと０．４℃／ｓ
の場合のＡＺ９１合金の結晶粒度に及ぼす鋳造温度の影
響を示したものである。鋳造温度が７２０℃から６６０
℃になるに従い，冷却速度が速い場合でも結晶粒が著し
く粗大化することがわかる。また，鋳造温度が６６０℃
を超えてさらに低下すると結晶粒が著しく微細化し，１
００μｍ以下の微細な組織を示す。FIG. 4 shows that the cooling rates are 4 ° C./s and 0.4 ° C./s.
3 shows the effect of casting temperature on the grain size of the AZ91 alloy in the case of (1). Casting temperature from 720 ° C to 660
It can be seen that as the temperature increases, the crystal grains become extremely coarse even when the cooling rate is high. The casting temperature is 660 ° C
When the temperature further decreases, the crystal grains become extremely fine,
It shows a fine structure of 00 μm or less.
【００１３】本発明では鋳造温度の過熱度が６０℃以上
では，鋳造温度の低下に伴い著しく結晶粒が粗大化す
る。また，鋳造温度を上昇すれば結晶粒は小さくなるが
１００μｍ以下の微細結晶粒になるものではなく，むし
ろマグネシウム合金溶湯の酸化，燃焼，ガス吸収が多く
なる。このため，鋳造温度は過熱度を６０℃未満とす
る。In the present invention, when the superheating degree of the casting temperature is 60 ° C. or more, the crystal grains are remarkably coarsened as the casting temperature decreases. When the casting temperature is increased, the crystal grains become smaller, but they do not become fine crystal grains of 100 μm or less, but rather increase the oxidation, combustion and gas absorption of the molten magnesium alloy. For this reason, the casting temperature is set to a degree of superheat of less than 60 ° C.
【００１４】さらに，本発明ではマグネシウム合金溶湯
３の冷却速度が０．５℃／ｓ未満では結晶粒が粗大化し
たりあるいは結晶粒のサイズがばらつくことになる。こ
のため冷却速度を０．５℃／ｓ以上にする。Furthermore, in the present invention, if the cooling rate of the magnesium alloy melt 3 is less than 0.5 ° C./s, the crystal grains become coarse or the size of the crystal grains varies. Therefore, the cooling rate is set to 0.5 ° C./s or more.
【００１５】[0015]
【発明の効果】以上説明したことからも明らかなよう
に，本発明に係る半溶融成形に適したマグネシウム合金
鋳造素材の製造方法では，液相線温度に対して過熱度を
６０℃未満に保持されたＭｇ−Ａｌ系およびＭｇ−Ａｌ
−Ｚｎ系合金溶湯を０．５℃／ｓ以上の凝固区間冷却速
度で凝固させて微細な等軸晶組織を有したマグネシウム
合金鋳造材を得るようにしたことにより，従来の微細化
処理による場合よりも細かい等軸晶組織を有し，しかも
半溶融状態で撹拌した後凝固させる方法で得られる粒状
組織に近い金属組織を得ることが出来るため，半溶融成
形に適した素材を容易にかつ確実に得られる。As is apparent from the above description, in the method for producing a magnesium alloy casting material suitable for semi-solid molding according to the present invention, the degree of superheat is maintained at less than 60 ° C. with respect to the liquidus temperature. Mg-Al system and Mg-Al
-The case of the conventional refinement process by solidifying the molten Zn alloy at a solidification zone cooling rate of 0.5 ° C / s or more to obtain a magnesium alloy cast material having a fine equiaxed crystal structure. It is possible to obtain a metal structure close to the granular structure obtained by a method of solidifying after stirring in a semi-molten state and having a finer equiaxed crystal structure than that of a semi-molten crystal. Is obtained.
【図１】本発明に係るマグネシウム合金鋳造素材の製造
方法の一実施例を示す説明図である。FIG. 1 is an explanatory view showing one embodiment of a method for manufacturing a magnesium alloy casting material according to the present invention.
【図２】マグネシウム合金鋳造素材の製造方法を示す説
明図である。FIG. 2 is an explanatory view showing a method of manufacturing a magnesium alloy casting material.
【図３】マグネシウム合金鋳造素材の製造方法を示す説
明図である。FIG. 3 is an explanatory view showing a method for manufacturing a magnesium alloy casting material.
【図４】ＡＺ９１合金の結晶粒度に及ぼす鋳造温度の影
響を示す特性図である。FIG. 4 is a characteristic diagram showing the effect of casting temperature on the grain size of AZ91 alloy.
１ 鉄製るつぼ ２ ヒータ ３ マグネシウム合金溶湯 ４ 柄杓 ５ シール材 ６ 熱電対 ７ 鋳型 Reference Signs List 1 iron crucible 2 heater 3 molten magnesium alloy 4 ladle 5 sealing material 6 thermocouple 7 mold
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平５−223759（ＪＰ，Ａ) 実開 平３−14051（ＪＰ，Ｕ) 特表 昭58−502001（ＪＰ，Ａ) 社団法人日本総合鋳物センター編「軽 金属鋳物便覧」，丸善株式会社，昭和40 年12月５日発行、Ｐ．425−426 (58)調査した分野(Int.Cl.6，ＤＢ名) C22C 1/02 503 B22D 21/04 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-223759 (JP, A) JP-A-3-14051 (JP, U) Tokushou 58-582001 (JP, A) Japan Casting Co., Ltd. Center edition "Light Metal Casting Handbook", Maruzen Co., Ltd., issued on December 5, 1965, 425-426 (58) Field surveyed (Int. Cl. 6 , DB name) C22C 1/02 503 B22D 21/04
Claims (1)
に保持されたＭｇ−Ａｌ系およびＭｇ−Ａｌ−Ｚｎ系合
金溶湯を０．５℃／ｓ以上の凝固区間冷却速度で凝固さ
せて微細な等軸晶組織を有したマグネシウム合金鋳造材
を得るようにしたことを特徴とする半溶融成形に適した
マグネシウム合金鋳造材の製造方法。1. A method of solidifying a molten Mg—Al-based or Mg—Al—Zn-based alloy having a superheat degree of less than 60 ° C. with respect to a liquidus temperature at a solidification zone cooling rate of 0.5 ° C./s or more. A method for producing a magnesium alloy cast material suitable for semi-solid forming, wherein a magnesium alloy cast material having a fine equiaxed crystal structure is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22258693A JP2962453B2 (en) | 1993-09-07 | 1993-09-07 | Manufacturing method of magnesium alloy casting material suitable for semi-solid molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22258693A JP2962453B2 (en) | 1993-09-07 | 1993-09-07 | Manufacturing method of magnesium alloy casting material suitable for semi-solid molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0776740A JPH0776740A (en) | 1995-03-20 |
| JP2962453B2 true JP2962453B2 (en) | 1999-10-12 |
Family
ID=16784794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22258693A Expired - Fee Related JP2962453B2 (en) | 1993-09-07 | 1993-09-07 | Manufacturing method of magnesium alloy casting material suitable for semi-solid molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2962453B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO950843L (en) * | 1994-09-09 | 1996-03-11 | Ube Industries | Method of Treating Metal in Semi-Solid State and Method of Casting Metal Bars for Use in This Method |
| KR20030039829A (en) * | 2001-11-15 | 2003-05-22 | 박영철 | Light alloy which magnesium is used as main raw naterials and casting products by using the light alloy |
| DE102010042402A1 (en) * | 2010-10-13 | 2012-04-19 | Federal-Mogul Burscheid Gmbh | Method for producing a piston ring with embedded particles |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4694881A (en) * | 1981-12-01 | 1987-09-22 | The Dow Chemical Company | Method for making thixotropic materials |
| JPH0314051U (en) * | 1989-06-19 | 1991-02-13 | ||
| JPH05223759A (en) * | 1991-05-10 | 1993-08-31 | Toyota Central Res & Dev Lab Inc | Crystal grain fragmentation judgment device for magnesium alloy melt |
-
1993
- 1993-09-07 JP JP22258693A patent/JP2962453B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| 社団法人日本総合鋳物センター編「軽金属鋳物便覧」，丸善株式会社，昭和４０年１２月５日発行、Ｐ．４２５−４２６ |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0776740A (en) | 1995-03-20 |
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| LAPS | Cancellation because of no payment of annual fees |