JP2003340553A - Continuous casting method for magnesium alloy sheet - Google Patents
Continuous casting method for magnesium alloy sheetInfo
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- JP2003340553A JP2003340553A JP2002153964A JP2002153964A JP2003340553A JP 2003340553 A JP2003340553 A JP 2003340553A JP 2002153964 A JP2002153964 A JP 2002153964A JP 2002153964 A JP2002153964 A JP 2002153964A JP 2003340553 A JP2003340553 A JP 2003340553A
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- thickness
- continuous casting
- casting method
- magnesium alloy
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Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、マグネシウム合金薄板
の連続鋳造方法、詳しくは、連続鋳造工程に続く熱間圧
延工程(以下、「熱延工程」という)を省略して製品と
しての薄板を得るための仕上圧延用素材(以下、単に
「圧延用素材」という)である薄板を提供することがで
きるマグネシウム合金薄板の連続鋳造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for continuously casting a magnesium alloy sheet, and more specifically, a sheet as a product by omitting a hot rolling step (hereinafter referred to as "hot rolling step") following the continuous casting step. The present invention relates to a continuous casting method for a magnesium alloy thin plate capable of providing a thin plate which is a material for finish rolling (hereinafter, simply referred to as "raw material for rolling") for obtaining.
【0002】[0002]
【従来の技術】マグネシウム合金は、アルミニウム合金
に比べて比重が約2/3で、実用金属中最も軽く、また
かなりの強さを有しているため、航空機部品、自動車部
品などに利用されている。2. Description of the Related Art Magnesium alloy has a specific gravity of about 2/3 that of aluminum alloy, is the lightest among practical metals, and has a considerable strength, so it is used for aircraft parts, automobile parts, etc. There is.
【0003】マグネシウム合金の製品薄板は、通常、マ
グネシウム合金のインゴットや連続鋳造により得られた
ビレット、ブルーム、スラブなどの鋳片を熱間で圧延
し、その後に冷間圧延(以下、「冷延」ともいう)する
ことにより製造されている。インゴットあるいは鋳片が
製造されてから熱間圧延(以下、「熱延」ともいう)を
行うまでに時間的な間隔が生じるため、インゴットある
いは鋳片の温度は常温付近まで低下する。このため、イ
ンゴットや鋳片の温度を常温付近から熱延を行うのに必
要な温度(約300〜400℃)にまで加熱しなければ
ならず、この加熱のために多大なエネルギーを要し、製
造コストが高くなる。[0003] A magnesium alloy product sheet is usually obtained by hot rolling a billet, a bloom, a slab or the like obtained by a magnesium alloy ingot or continuous casting, followed by cold rolling (hereinafter referred to as "cold rolling"). Also referred to as “”. Since there is a time interval between the production of the ingot or the slab and the hot rolling (hereinafter, also referred to as “hot rolling”), the temperature of the ingot or the slab falls to around room temperature. Therefore, it is necessary to heat the temperature of the ingot or the slab from around room temperature to the temperature required for hot rolling (about 300 to 400 ° C.), which requires a large amount of energy for heating. Manufacturing cost is high.
【0004】冷延が可能な厚さの鋳片を単ロール法ある
いは双ロール法等により直接製造すれば、熱延工程の省
略が可能である。しかし、このようにして製造した前記
鋳片を冷間圧延して圧延用素材としての薄板を得ても、
圧下比を大きくすることが不可能なため、製品薄板の機
械的特性と密接に関連する圧延用素材としての薄板の結
晶粒サイズを小さくすることが困難である。そのため、
単ロール法あるいは双ロール法等を用いて得られる製品
薄板は、従来行われているような、常温のインゴットあ
るいは鋳片を加熱してから熱間圧延を行い、その後に冷
間圧延を行って製造された製品薄板に比べて、延性や引
張強さ等の機械的特性が劣っている。If a slab having a thickness capable of cold rolling is directly produced by a single roll method or a twin roll method, the hot rolling step can be omitted. However, even if a thin plate as a material for rolling is obtained by cold rolling the slab produced in this way,
Since it is impossible to increase the reduction ratio, it is difficult to reduce the crystal grain size of the thin plate as a rolling material, which is closely related to the mechanical properties of the product thin plate. for that reason,
The product sheet obtained by using the single roll method or the twin roll method, etc., as is conventionally done, after heating the ingot or slab at room temperature, hot rolling, and then cold rolling. The mechanical properties such as ductility and tensile strength are inferior to the manufactured product sheet.
【0005】さらに、単ロール法や双ロール法で製造さ
れる鋳片の厚さが薄いため、鋳造時の給湯量の変動や、
ロールに付着したスケールや汚れに起因して生じる冷却
斑によってその厚さが大きく変わる。得られる鋳片の厚
さが薄いだけにその影響が大きく、このような鋳片を冷
間圧延して圧延用素材としての薄板、さらには製品薄板
を得ても、その製品薄板の平坦度が低下することにな
る。Further, since the slabs produced by the single roll method or the twin roll method are thin, fluctuations in the amount of hot water supplied during casting,
The thickness of the roll varies greatly depending on the scale attached to the roll and the cooling spots caused by dirt. Even if the thickness of the obtained slab is thin, its effect is large, and even if such a slab is cold-rolled to obtain a thin plate as a material for rolling, and further a product thin plate, the flatness of the product thin plate is Will be reduced.
【0006】上述したように、マグネシウム合金の製品
薄板を製造するにあたり、現状では、インゴットや鋳片
を多大なエネルギーを費やして加熱、昇温してから熱延
を行うか、あるいは機械的特性や平坦度を犠牲にして単
ロール法や双ロール法により冷延が可能な厚さの鋳片を
製造する他はない。As described above, in producing a magnesium alloy product thin plate, at present, an ingot or a slab is heated with a great deal of energy to heat up and then hot rolled, or the mechanical properties and There is no choice but to produce a slab having a thickness capable of being cold-rolled by a single roll method or a twin roll method at the expense of flatness.
【0007】[0007]
【発明が解決しようとする課題】本発明は、上述した従
来の技術における問題点を解決すべくなされたものであ
って、その目的は、熱延工程の省略が可能であり、しか
も機械的特性や平坦度等の表面性状にも優れたマグネシ
ウム合金薄板の連続鋳造方法を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and the object thereof is to omit the hot rolling process and to provide mechanical characteristics. Another object of the present invention is to provide a continuous casting method of a magnesium alloy thin plate having excellent surface properties such as flatness and flatness.
【0008】[0008]
【課題を解決するための手段】本発明者らは、上記の課
題を解決するため、種々の条件下でマグネシウム合金薄
板の連続鋳造を行って検討を重ねた。その結果、連続鋳
造過程において、鋳片が高温状態にあり、しかも未凝固
の溶湯が存在する状態で鋳片を絞り加工するか、鋳型の
下方直下に配設したロール対を用いて圧延するか、また
は鋳型内に間仕切りブロックを配置して溶湯を分割する
ことによって、冷延が可能な厚さを有する鋳片が得られ
ることを知見した。これによって、通常行われている熱
延工程を省略し、しかも機械的特性や平坦度等の表面性
状にも優れたマグネシウム合金薄板を得ることができ
る。In order to solve the above-mentioned problems, the inventors of the present invention conducted continuous casting of magnesium alloy thin plates under various conditions, and conducted repeated studies. As a result, in the continuous casting process, whether the slab is in a high temperature state, and the slab is drawn in the state where unsolidified molten metal exists, or whether it is rolled by using a pair of rolls arranged immediately below the mold. It was also found that a slab having a thickness capable of cold rolling can be obtained by arranging a partition block in the mold and dividing the molten metal. As a result, it is possible to obtain a magnesium alloy thin plate that omits the hot rolling process that is usually performed and that has excellent surface properties such as mechanical properties and flatness.
【0009】本発明は上記知見に基づいてなされたもの
で、その要旨は、下記(1)〜(3)に記載のマグネシ
ウム合金薄板の連続鋳造方法にある。The present invention was made on the basis of the above findings, and its gist resides in the continuous casting method for magnesium alloy thin plates described in (1) to (3) below.
【0010】(1)鋳型の厚さを鋳造方向に漸減させた
鋳型を用い、未凝固の溶湯を含む鋳片の厚さを減少させ
る連続鋳造方法であって、鋳型出口における厚さ減少後
の鋳片の厚さ中心部の固相率が1未満であるマグネシウ
ム合金薄板の連続鋳造方法。(1) A continuous casting method in which the thickness of a slab containing unsolidified molten metal is reduced by using a mold in which the thickness of the mold is gradually reduced in the casting direction. A continuous casting method for a magnesium alloy thin plate, wherein the solid fraction of the thickness center of the slab is less than 1.
【0011】(2)鋳型の下方直下に設置した圧下ロー
ル対を用いて未凝固の溶湯を含む鋳片を圧下し、その厚
さを減少させる連続鋳造方法であって、圧下ロール対の
ロール軸心を結ぶ線における圧下後の鋳片の厚さ中心部
の固相率が1未満であるマグネシウム合金薄板の連続鋳
造方法。(2) A continuous casting method for reducing the thickness of a cast piece containing unsolidified molten metal by using a pair of reduction rolls installed just below the mold, and a roll shaft of the reduction roll pair. A continuous casting method for a magnesium alloy thin plate, wherein a solid phase ratio of a thickness center portion of a cast slab after reduction in a line connecting cores is less than 1.
【0012】(3)鋳造方向に厚さが漸増する間仕切り
ブロックを鋳型内の厚さ中心部近傍に間隔を設けて鋳型
の全幅にわたり1以上配置し、この間仕切りブロックの
上部先端部は溶湯中に位置させ、この間仕切りブロック
の下部は鋳型の下端部近傍に位置させた鋳型を用い、複
数の薄板を得るマグネシウム合金薄板の連続鋳造方法。(3) One or more partition blocks, whose thickness gradually increases in the casting direction, are provided in the vicinity of the center of the thickness in the mold and are arranged over the entire width of the mold. The top end of the partition block is placed in the molten metal. A continuous casting method of a magnesium alloy thin plate in which a plurality of thin plates are obtained by using a mold positioned below the partition block near the lower end of the mold.
【0013】ここでいう「マグネシウム合金」とは、マ
グネシウムに、例えばアルミニウムや亜鉛等の合金元素
を添加して溶製したマグネシウム合金の他に、純マグネ
シウムのような純金属も含むものである。また、「マグ
ネシウム合金薄板」とは、前述したように、マグネシウ
ム合金の製品薄板を得るための圧延用素材(仕上圧延用
素材)としての薄板である。The term "magnesium alloy" as used herein includes not only magnesium alloys prepared by adding alloy elements such as aluminum and zinc to magnesium, but also pure metals such as pure magnesium. The "magnesium alloy thin plate" is a thin plate as a rolling material (finish rolling material) for obtaining a magnesium alloy product thin plate, as described above.
【0014】前記の「鋳型の厚さ」とは、鋳型の形状を
規定する内寸(溶湯収容部分の寸法)のうちの、鋳片
(つまり、この鋳型で得られる鋳片)の厚さ方向に相当
する方向の長さ(距離)をいう。以下、単に「鋳型厚
さ」ともいう。The above-mentioned "thickness of the mold" means the thickness direction of the cast piece (that is, the cast piece obtained by this mold) among the inner dimensions (dimension of the molten metal containing portion) that define the shape of the mold. Is the length (distance) in the direction corresponding to. Hereinafter, it is also simply referred to as “mold thickness”.
【0015】また、「鋳片の厚さ中心部の固相率」と
は、中心部の単位体積中の固相の割合を意味する。例え
ば、凝固時の溶質再分配の計算から求まる含有量と、熱
力学計算から求まる含有量と固相率の関係から求めるこ
とができる。The term "solid fraction in the central portion of the thickness of the slab" means the proportion of solid phase in the unit volume of the central portion. For example, it can be determined from the content determined from the calculation of solute redistribution during solidification, and the relationship between the content determined from thermodynamic calculation and the solid fraction.
【0016】[0016]
【発明の実施の形態】以下に、本発明のマグネシウム合
金薄板の連続鋳造方法(上記(1)、(2)または
(3)に記載の連続鋳造方法)について、図面を参照し
て具体的に説明する。BEST MODE FOR CARRYING OUT THE INVENTION A continuous casting method for a magnesium alloy sheet according to the present invention (the continuous casting method described in (1), (2) or (3) above) will be specifically described below with reference to the drawings. explain.
【0017】図1は、本発明の連続鋳造方法を説明する
ための模式図で、上記(1)に記載の連続鋳造方法の実
施の際に用いる鋳型の一例の鋳型厚さ方向縦断面図であ
る。FIG. 1 is a schematic diagram for explaining the continuous casting method of the present invention, which is a vertical cross-sectional view of an example of the mold used in carrying out the continuous casting method described in (1) above. is there.
【0018】図1に示したように、この連続鋳造方法で
使用する鋳型1aは、その厚さが鋳造方向に漸減する鋳
型、すなわち、鋳片厚さに相当する鋳型1aの下端部の厚
さが鋳型1aの上端部に比べて狭められた鋳型である。鋳
型1aの厚さが漸減しはじめる部位(起点)は必ずしも鋳
型1aの上端部である必要はない。この例では、鋳型の上
端部から鋳型長さの2/3ほど下方へ下がった部位が起
点となり、そこから鋳型の下端部に向かって鋳型厚さが
漸減している。As shown in FIG. 1, the mold 1a used in this continuous casting method is a mold whose thickness gradually decreases in the casting direction, that is, the thickness of the lower end of the mold 1a corresponding to the thickness of the cast piece. Is a mold that is narrower than the upper end of the mold 1a. The portion (starting point) where the thickness of the mold 1a starts to gradually decrease does not necessarily have to be the upper end portion of the mold 1a. In this example, the starting point is a portion that is lowered from the upper end of the mold by about ⅔ of the length of the mold, and the mold thickness gradually decreases from there to the lower end of the mold.
【0019】連続鋳造鋳型1a内にはマグネシウム合金の
溶湯2が浸漬ノズル3から供給され、鋳型1aの壁面近傍
には凝固シェル7が形成される。この例では、鋳型内
の、鋳型1a厚さが漸減しはじめる部位および鋳型1aの下
端部の近傍には全周にわたって鋳型加熱用のヒーター4
が設置され、温度制御のための熱電対5が取り付けられ
ている。また、鋳型1aの厚さが漸減する途中の部位に潤
滑油を供給するための潤滑油供給孔6が設けられてい
る。なお、前記の溶湯2と凝固シェル7の境界線は固相
率1の界面を示す。A molten magnesium alloy 2 is supplied from a dipping nozzle 3 into the continuous casting mold 1a, and a solidified shell 7 is formed near the wall surface of the mold 1a. In this example, a heater 4 for heating the mold is provided over the entire circumference in the mold 1a where the thickness of the mold 1a starts to gradually decrease and in the vicinity of the lower end of the mold 1a.
Is installed, and a thermocouple 5 for temperature control is installed. In addition, a lubricating oil supply hole 6 for supplying lubricating oil is provided in a portion where the thickness of the mold 1a is gradually decreasing. The boundary line between the molten metal 2 and the solidified shell 7 indicates the interface with a solid phase ratio of 1.
【0020】このように構成された連続鋳造鋳型1aを用
い、鋳片が高温で、しかも未凝固の溶湯が存在する状態
でそれを下方(図中に白抜き矢印で示した方向)へ引き
抜いて鋳片の厚さを減少させる、いわば鋳片に絞り加工
を加えることにより、冷延が可能な厚さの鋳片を得るこ
とができる。Using the continuous casting mold 1a configured as described above, the slab is pulled out downward (in the direction shown by the white arrow in the figure) in the state where the slab has a high temperature and the unsolidified molten metal exists. By reducing the thickness of the slab, that is, by subjecting the slab to drawing, it is possible to obtain a slab having a thickness that enables cold rolling.
【0021】このとき、鋳型出口(すなわち、鋳型1aの
下端部に設けられた開口部)における鋳片の厚さ中心部
の固相率(以下、「中心固相率」という)は1未満とす
る。鋳片の厚さが絞り加工により減少する部位において
鋳片に未凝固の溶湯が含まれていれば、支障なく鋳片の
引き抜きができ、冷延が可能な厚さの鋳片が得られるか
らである。At this time, the solid phase ratio (hereinafter referred to as "central solid phase ratio") at the center of the thickness of the cast piece at the mold outlet (that is, the opening provided at the lower end of the mold 1a) is less than 1. To do. If the slab contains unsolidified molten metal at the part where the thickness of the slab is reduced by drawing, the slab can be drawn out without any problem, and a slab with a thickness capable of cold rolling can be obtained. Is.
【0022】図2は、同じく本発明の連続鋳造方法を説
明するための模式図で、上記(2)に記載の連続鋳造方
法の実施の際に用いる鋳型の一例の鋳型厚さ方向縦断面
図である。FIG. 2 is a schematic view for explaining the continuous casting method of the present invention, and is a longitudinal cross-sectional view of an example of the mold used when the continuous casting method described in (2) above is carried out. Is.
【0023】図2に示したように、この連続鋳造方法で
使用する鋳型1bは、その上端部から下端部まで一定の厚
さを有しており、鋳型1bの下方直下に圧下ロール対8が
設置されている。また、この例では、鋳型1bの下端部と
圧下ロール対8の間に鋳片を保温するための保温カバー
9が取り付けられている。なお、「鋳型1bの下方直下」
とは、鋳型1bの直下もしくはその幾分か下を意味する。
例えば、圧下ロール対8の設置の際の設備的な制約等に
より両者間に間隙が生じ、例示したような保温カバー9
が取り付けられる場合もあるので、そのような場合も
「下方直下」に含まれる。As shown in FIG. 2, the mold 1b used in this continuous casting method has a constant thickness from the upper end to the lower end thereof, and a pair of reduction rolls 8 is provided just below the mold 1b. is set up. Further, in this example, a heat retaining cover 9 for retaining the temperature of the slab is attached between the lower end of the mold 1b and the pair of reduction rolls 8. Incidentally, "just below the mold 1b"
Means just below the template 1b or slightly below it.
For example, a gap is generated between the pressing roll pair 8 due to a restriction on the equipment when the rolling roll pair 8 is installed, and the heat insulating cover 9 as illustrated.
Since it may be attached, such a case is also included in “directly below”.
【0024】このように構成された連続鋳造鋳型1b内に
マグネシウム合金の溶湯2が浸漬ノズル3から供給さ
れ、鋳型1bの壁面近傍に凝固シェル7が形成される。そ
して、鋳型1bから出てくる未凝固の溶湯を含んだ高温状
態の鋳片を鋳型1bの下方直下に設置した圧下ロール対8
により圧延する。これにより、鋳片の厚さを減少させ、
その後鋳片を下方(図中に白抜き矢印で示した方向)へ
引き抜くことによって、冷延が可能な厚さの鋳片を得る
ことができる。なお、圧下ロール対8による圧下に代
え、圧下治具を用いた鍛圧により鋳片の厚さを減少さ
せ、冷延が可能な厚さとしてもよい。A molten magnesium alloy 2 is supplied from a dipping nozzle 3 into the continuous casting mold 1b thus constructed, and a solidified shell 7 is formed near the wall surface of the mold 1b. Then, a rolling roll pair 8 in which a slab in a high temperature state containing unsolidified molten metal coming out of the mold 1b is installed immediately below the mold 1b.
By rolling. This reduces the thickness of the slab,
After that, the slab can be obtained by pulling the slab downward (in the direction indicated by the white arrow in the figure) to a thickness that allows cold rolling. Instead of the reduction by the reduction roll pair 8, the thickness of the cast piece may be reduced by forging pressure using a reduction jig so that the thickness can be cold rolled.
【0025】前記圧下ロール対8による圧延の際、圧下
ロール対8のそれぞれのロール軸心を結ぶ線、すなわ
ち、この仮想的な線で表される高さレベルにおける圧下
後の鋳片の中心固相率は1未満とする。上記(1)に記
載の連続鋳造方法の場合と同様に、圧下により鋳片の厚
さが減少する部位において鋳片に未凝固の溶湯が含まれ
ていれば、圧下ロール対8に過大な負荷がかかることな
く鋳片の引き抜きができ、冷延が可能な厚さの鋳片が得
られるからである。During rolling with the rolling roll pair 8, the center solid of the cast slab after rolling at the height level represented by the line connecting the roll axes of the rolling roll pair 8, that is, the imaginary line. The phase ratio is less than 1. As in the case of the continuous casting method described in (1) above, if unsmelted molten metal is contained in the slab at a site where the thickness of the slab decreases due to the reduction, an excessive load is applied to the reduction roll pair 8. This is because the slab can be pulled out without causing any damage and a slab with a thickness that enables cold rolling can be obtained.
【0026】図3は、同じく本発明の連続鋳造方法を説
明するための模式図で、上記(3)に記載の連続鋳造方
法の実施の際に用いる鋳型の一例の鋳型厚さ方向縦断面
図である。FIG. 3 is a schematic view for explaining the continuous casting method of the present invention as well, and is a vertical cross-sectional view of an example of a mold used for carrying out the continuous casting method described in (3) above. Is.
【0027】図3に示したように、この連続鋳造方法で
使用する鋳型1cは、鋳造方向に厚さが漸増する間仕切り
ブロック10を鋳型1c内の鋳型厚さの中心部近傍に有して
いる。間仕切りブロック10は、鋳型1cの全幅にわたって
配置され、その上部先端部は溶湯2中に位置し、その下
部は鋳型1cの下端部近傍に位置している。また、この例
では、鋳型1c内の溶湯表面の皮張りを防止するため、鋳
型1c内のメニスカス近傍の全周にヒーター11が設置さ
れ、温度制御のための熱電対12が取り付けられている。As shown in FIG. 3, the mold 1c used in this continuous casting method has a partition block 10 in which the thickness gradually increases in the casting direction, in the vicinity of the center of the mold thickness in the mold 1c. . The partition block 10 is arranged over the entire width of the mold 1c, its upper end is located in the molten metal 2 and its lower part is located near the lower end of the mold 1c. Further, in this example, in order to prevent skinning of the surface of the molten metal in the mold 1c, a heater 11 is installed on the entire circumference in the vicinity of the meniscus in the mold 1c, and a thermocouple 12 for temperature control is installed.
【0028】間仕切りブロックの形状に特に制約はな
く、下端部の厚さは、冷延が可能な厚さの鋳片が得られ
るように適宜調整される。また、図3に示した例では間
仕切りブロック10は1個であるが、2個以上であっても
よい。その場合、複数の間仕切りブロックは、鋳型厚さ
の中心部近傍において、冷延が可能な厚さの鋳片が得ら
れるように、それぞれ間隔を設けて配置される。なお、
前記の「中心部近傍」の範囲は間仕切りブロックの設置
個数によって異なり、設置個数が1個のときは狭く実質
的に鋳型厚さの中心になるが、設置個数が増えるに伴い
広がって、例えば設置個数が2個のときは、鋳型厚さを
3等分したうちの中央部分に相当する範囲を指すことと
なる。There is no particular restriction on the shape of the partition block, and the thickness of the lower end portion is appropriately adjusted so that a slab having a thickness capable of cold rolling can be obtained. Further, although the partition block 10 is one in the example shown in FIG. 3, it may be two or more. In that case, the plurality of partition blocks are arranged at intervals in the vicinity of the center of the mold thickness so that a slab having a thickness capable of cold rolling can be obtained. In addition,
The range of "the vicinity of the central portion" varies depending on the number of partition blocks installed. When the number of installed partition blocks is 1, the range is narrow and becomes substantially the center of the mold thickness, but it increases as the number of installed blocks increases. When the number of molds is two, it means a range corresponding to the central part of the mold thickness divided into three equal parts.
【0029】このように構成された連続鋳造鋳型1c内に
マグネシウム合金の溶湯2が浸漬ノズル3から供給さ
れ、鋳型1cの壁面近傍に凝固シェル7が形成される。こ
のとき、鋳型1cの壁面近傍における凝固シェル7の形成
の開始点が、鋳型1c内に設置された間仕切りブロック10
の表面近傍における凝固シェル7の形成の開始点とほぼ
同じ高さレベルになるように、鋳型1c内に設置されてい
るヒーター11により溶湯2が加熱される。そして、鋳片
を下方(図中に白抜き矢印で示した方向)へ引き抜け
ば、鋳型1c内に配置された間仕切りブロック10により溶
湯が分割されているので、図示したように2個の鋳片が
得られ、それぞれの鋳片の厚さは冷延が可能な厚さとな
る。The molten magnesium alloy 2 is supplied from the dipping nozzle 3 into the continuous casting mold 1c thus constructed, and the solidified shell 7 is formed near the wall surface of the mold 1c. At this time, the starting point of the formation of the solidified shell 7 near the wall surface of the mold 1c is the partition block 10 installed in the mold 1c.
The molten metal 2 is heated by the heater 11 installed in the mold 1c so that the height level is almost the same as the starting point of the formation of the solidified shell 7 in the vicinity of the surface. Then, when the cast piece is pulled out downward (in the direction shown by the white arrow in the figure), the molten metal is divided by the partition block 10 arranged in the mold 1c, so that the two cast pieces are drawn as shown in the figure. Pieces are obtained, and the thickness of each cast piece is such that cold rolling is possible.
【0030】この鋳型を用いれば、一つの鋳型で同時に
複数の圧延用素材を得ることができ、冷延が可能な厚さ
の鋳片を効率よく製造することができる。By using this mold, a plurality of raw materials for rolling can be obtained at the same time with one mold, and a slab having a thickness capable of cold rolling can be efficiently manufactured.
【0031】上記(1)、(2)または(3)に記載の
連続鋳造方法により得られる鋳片は、いずれも冷延が可
能な厚さとなっているので、次工程の熱延工程を省略す
ることができ、省エネルギーの達成が可能となる。しか
も、(1)または(2)に記載の連続鋳造方法では、高
温状態の厚さのある鋳片を絞り加工または鋳型の下方直
下に配設した圧下ロール対による圧延によって、高い圧
下比を確保することができ、結晶粒を細粒化することが
可能となる。また、従来の単ロール法や双ロール法で製
造される鋳片を冷間圧延する場合のような平坦度の低下
はないので、機械的特性や表面性状にも優れたマグネシ
ウム合金薄板が得られる。なお、(3)に記載の連続鋳
造方法により得られる鋳片は、平坦度等の表面性状に優
れ、また、(1)に記載の連続鋳造方法の場合に比べる
と絞り加工の程度は低いが、それでも間仕切りブロック
の厚さが鋳造方向に漸増しているので絞り加工を受ける
こととなり、機械的特性が確保される。以下、実施例に
より本発明の効果を具体的に説明する。The slabs obtained by the continuous casting method described in (1), (2) or (3) above all have a thickness that allows cold rolling, so the next hot rolling step is omitted. It is possible to achieve energy saving. Moreover, in the continuous casting method described in (1) or (2), a high reduction ratio is secured by drawing a slab having a high temperature and having a thickness, or by rolling with a pair of reduction rolls arranged immediately below the mold. It is possible to make the crystal grains finer. Further, since there is no decrease in flatness as in the case of cold rolling a slab manufactured by the conventional single roll method or twin roll method, a magnesium alloy thin plate excellent in mechanical properties and surface properties can be obtained. . The slab obtained by the continuous casting method described in (3) has excellent surface properties such as flatness and the degree of drawing is lower than that in the continuous casting method described in (1). However, since the thickness of the partition block is gradually increased in the casting direction, the partition block is subjected to the drawing process, and the mechanical characteristics are secured. Hereinafter, the effects of the present invention will be specifically described with reference to Examples.
【0032】[0032]
【実施例】〔実施例1〕図1に示した構成を有する鋳型
を用いて、本発明の連続鋳造方法(前記(1)に記載の
方法)によりマグネシウム合金薄板を製造した。実験条
件は下記のa〜hとした。なお、鋳型加熱用のヒーター
4の印加電圧は、熱伝対5の温度が100〜400℃になるよ
うに制御した。EXAMPLES Example 1 A magnesium alloy thin plate was produced by the continuous casting method of the present invention (the method described in (1) above) using the mold having the structure shown in FIG. The experimental conditions were the following ah. The applied voltage of the heater 4 for heating the mold was controlled so that the temperature of the thermocouple 5 was 100 to 400 ° C.
【0033】
a.マグネシウム合金:Mg−3%Al−1%Zn(融点632
℃)
b.注湯温度 :750℃
c.鋳型材質 :SUS430
d.鋳型サイズ(内寸):幅700mm×長さ200mm
鋳型の上端部から150mm下方の部位を起点に下端部へ向
かって鋳型厚さが漸減しており、上端部の厚さは100m
m、下端部の厚さは20mmである
e.引き抜き速度 :0.5m/min
f.鋳型振動条件 :振動数2.5Hz、ストローク3mmの
正弦波形振動
g.ヒーター仕様 :1000W、200V
h.潤滑油 :二硫化モリブデン
なお、比較のために、図4に示す鋳型を用いて従来の連
続鋳造方法により上記のマグネシウム合金の鋳片を製造
した。この鋳型1dは、幅700mm×長さ200mmで、その上端
部から下端部まで一定の厚さ(100mm)を有しており、
この鋳型1dにマグネシウム合金の溶湯2が浸漬ノズル3
を介して供給されると、鋳型1dの壁面近傍に凝固シェル
7が形成され、下方(図中に白抜き矢印で示した方向)
へ引き抜くことにより、鋳型1dの下端部の厚さに相当す
る厚さの鋳片が得られる。A. Magnesium alloy: Mg-3% Al-1% Zn (melting point 632
C.) b. Pouring temperature: 750 ° C c. Mold material: SUS430 d. Mold size (inner size): width 700 mm x length 200 mm The mold thickness gradually decreases from the upper end of the mold to the lower end 150 mm below the upper end, and the thickness of the upper end is 100 m
m, the thickness of the lower end is 20 mm e. Extraction speed: 0.5m / min f. Mold vibration condition: Vibration frequency 2.5Hz, sine wave vibration of stroke 3mm g. Heater specifications: 1000W, 200V h. Lubricating Oil: Molybdenum Disulfide For comparison, the above-mentioned magnesium alloy slab was manufactured by the conventional continuous casting method using the mold shown in FIG. This mold 1d has a width of 700 mm and a length of 200 mm, and has a constant thickness (100 mm) from its upper end to its lower end,
Molten magnesium alloy 2 is immersed in this mold 1d Nozzle 3
When it is supplied through the mold, the solidified shell 7 is formed in the vicinity of the wall surface of the mold 1d, and the solidified shell 7 is formed downward (in the direction indicated by the white arrow in the figure).
By pulling out to, a slab having a thickness corresponding to the thickness of the lower end of the mold 1d can be obtained.
【0034】上記の鋳造実験の結果、本発明の連続鋳造
方法により、熱延を省略することが可能な厚さのマグネ
シウム合金薄板(圧延用素材)が得られた。しかも、こ
のマグネシウム合金薄板は、鋳造方向で合金成分の偏析
(濃化)のない、均質なものであった。一方、従来の連
続鋳造方法により得られた鋳片は厚いので、通常と同じ
熱延工程を経る必要があるものであった。
〔実施例2〕図2に示した構成を有する鋳型を用いて、
本発明の連続鋳造方法(前記(2)に記載の方法)によ
りマグネシウム合金薄板を製造した。実験条件は下記の
a〜hとした。As a result of the above casting experiment, a magnesium alloy thin plate (rolling material) having a thickness capable of omitting hot rolling was obtained by the continuous casting method of the present invention. Moreover, this magnesium alloy thin plate was homogeneous without segregation (concentration) of alloy components in the casting direction. On the other hand, since the slab obtained by the conventional continuous casting method is thick, it was necessary to go through the same hot rolling step as usual. Example 2 Using a mold having the configuration shown in FIG.
A magnesium alloy thin plate was manufactured by the continuous casting method of the present invention (the method described in (2) above). The experimental conditions were the following ah.
【0035】
a.マグネシウム合金:Mg−3%Al−1%Zn(融点632
℃)
b.注湯温度 :750℃
c.鋳型材質 :SUS430
d.鋳型サイズ(内寸):幅700mm×長さ200mm×厚さ100m
m
e.引き抜き速度 :0.5m/min
f.鋳型振動条件 :振動数2.5Hz、ストローク3mmの
正弦波形振動
g.圧下ロールの外形:200mm
h.圧下後の鋳片厚さ:20mm
上記の鋳造実験の結果、実施例1の場合と同様、熱延を
省略することが可能な厚さを有し、しかも鋳造方向で合
金成分の偏析(濃化)のない、均質なマグネシウム合金
薄板が得られた。
〔実施例3〕図3に示した間仕切りブロックを有する鋳
型を用いて、本発明の連続鋳造方法(前記(3)に記載
の方法)によりマグネシウム合金薄板を製造した。実験
条件は下記のa〜iとした。A. Magnesium alloy: Mg-3% Al-1% Zn (melting point 632
C.) b. Pouring temperature: 750 ° C c. Mold material: SUS430 d. Mold size (inner size): width 700 mm x length 200 mm x thickness 100 m
me. Extraction speed: 0.5m / min f. Mold vibration condition: Vibration frequency 2.5Hz, sine wave vibration of stroke 3mm g. External shape of the pressing roll: 200 mm h. Thickness of cast slab after reduction: 20 mm As a result of the above-mentioned casting experiment, as in the case of Example 1, the thickness was such that hot rolling could be omitted, and segregation of alloy components (concentration) in the casting direction was performed. ) -Free, homogeneous magnesium alloy sheet was obtained. Example 3 A magnesium alloy thin plate was produced by the continuous casting method of the present invention (method described in (3) above) using the mold having the partition block shown in FIG. The experimental conditions were the following a to i.
【0036】
a.マグネシウム合金:Mg−3%Al−1%Zn(融点632
℃)
b.注湯温度 :750℃
c.鋳型材質 :SUS430
d.鋳型サイズ(内寸):幅400mm×長さ200mm
上端部の厚さは20mmで、間仕切りブロックの上部先端部
の位置は鋳型の上端部から50mm下方にあり、それによっ
て分割されたそれぞれについての下端部の厚さは5mmで
ある
e.引き抜き速度 :0.5m/min
f.鋳型振動条件 :振動数2.5Hz、ストローク3mmの
正弦波形振動
g.ヒーター容量 :200V、1000W
h.ヒーター位置 :鋳型の上端部から下方へ100mm
の位置(メニスカス下)
i.ヒーター温度 :650℃
上記の鋳造実験の結果、熱延を省略することが可能な厚
さのマグネシウム合金薄板を得ることができた。A. Magnesium alloy: Mg-3% Al-1% Zn (melting point 632
C.) b. Pouring temperature: 750 ° C c. Mold material: SUS430 d. Mold size (inner size): width 400mm x length 200mm, the thickness of the upper end is 20mm, the position of the upper tip of the partition block is 50mm below the upper end of the mold, and the lower end of each divided by it The thickness of the part is 5 mm e. Extraction speed: 0.5m / min f. Mold vibration condition: Vibration frequency 2.5Hz, sine wave vibration of stroke 3mm g. Heater capacity: 200V, 1000W h. Heater position: 100mm downward from the top of the mold
Position (below meniscus) i. Heater temperature: 650 ° C. As a result of the above casting experiment, it was possible to obtain a magnesium alloy thin plate having a thickness capable of omitting hot rolling.
【0037】[0037]
【発明の効果】本発明の連続鋳造方法によれば、熱延工
程の省略が可能で、しかも機械的特性や、平坦度等の表
面性状にも優れたマグネシウム合金薄板を製造すること
ができる。EFFECTS OF THE INVENTION According to the continuous casting method of the present invention, it is possible to manufacture a magnesium alloy thin plate which can omit the hot rolling step and has excellent mechanical properties and surface properties such as flatness.
【図1】本発明の連続鋳造方法の実施の際に用いる鋳型
の一例の鋳型厚さ方向縦断面図である。FIG. 1 is a vertical cross-sectional view of an example of a mold used in carrying out a continuous casting method of the present invention in a mold thickness direction.
【図2】本発明の連続鋳造方法の実施の際に用いる鋳型
の他の例の鋳型厚さ方向縦断面図である。FIG. 2 is a vertical cross-sectional view in the mold thickness direction of another example of the mold used when carrying out the continuous casting method of the present invention.
【図3】本発明の連続鋳造方法の実施の際に用いる鋳型
のさらに他の例の鋳型厚さ方向縦断面図である。FIG. 3 is a vertical cross-sectional view of a mold used in carrying out the continuous casting method of the present invention in a mold thickness direction of yet another example.
【図4】従来の連続鋳造方法の実施の際に用いる鋳型一
例の鋳型厚さ方向縦断面図である。FIG. 4 is a vertical cross-sectional view of an example of a mold used in carrying out a conventional continuous casting method in the mold thickness direction.
1a、1b、1c、1d:連続鋳造鋳型 2:溶湯 3:浸漬ノズル 4:ヒーター 5:熱電対 6:潤滑油供給孔 7:凝固シェル 8:圧下ロール対 9:保温カバー 10:間仕切りブロック 11:ヒーター 12:熱電対 1a, 1b, 1c, 1d: Continuous casting mold 2: Molten metal 3: Immersion nozzle 4: heater 5: Thermocouple 6: Lubricating oil supply hole 7: Solidified shell 8: Rolling roll pair 9: Thermal insulation cover 10: Partition block 11: heater 12: Thermocouple
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) B22D 11/20 B22D 11/20 C (72)発明者 村上 敏彦 大阪府大阪市中央区北浜4丁目5番33号 住友金属工業株式会社内─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) B22D 11/20 B22D 11/20 C (72) Inventor Toshihiko Murakami 4-5 Kitahama, Chuo-ku, Osaka-shi, Osaka No. 33 Sumitomo Metal Industries, Ltd.
Claims (3)
用い、未凝固の溶湯を含む鋳片の厚さを減少させる連続
鋳造方法であって、鋳型出口における厚さ減少後の鋳片
の厚さ中心部の固相率が1未満であることを特徴とする
マグネシウム合金薄板の連続鋳造方法。1. A continuous casting method for reducing the thickness of a slab containing an unsolidified molten metal by using a mold in which the thickness of the mold is gradually reduced in a casting direction, the casting after the thickness is reduced at a mold outlet. A continuous casting method for a magnesium alloy thin plate, characterized in that the solid phase ratio of the thickness center portion of the piece is less than 1.
用いて未凝固の溶湯を含む鋳片を圧下し、その厚さを減
少させる連続鋳造方法であって、圧下ロール対のロール
軸心を結ぶ線における圧下後の鋳片の厚さ中心部の固相
率が1未満であることを特徴とするマグネシウム合金薄
板の連続鋳造方法。2. A continuous casting method for reducing the thickness of a cast slab containing unsolidified molten metal by using a pair of reduction rolls installed directly below a mold, the roll axis of the pair of reduction rolls. A continuous casting method for a magnesium alloy thin plate, characterized in that the solid phase ratio of the thickness center portion of the cast slab on the line connecting the two is less than 1.
クを鋳型内の厚さ中心部近傍に間隔を設けて鋳型の全幅
にわたり1以上配置し、この間仕切りブロックの上部先
端部は溶湯中に位置させ、この間仕切りブロックの下部
は鋳型の下端部近傍に位置させた鋳型を用い、複数の薄
板を得ることを特徴とするマグネシウム合金薄板の連続
鋳造方法。3. One or more partition blocks having a thickness gradually increasing in the casting direction are provided over the entire width of the mold at intervals in the vicinity of the center of the thickness in the mold, and the upper end of the partition block is located in the molten metal. Then, a lower part of the partition block is positioned near the lower end of the mold, and a plurality of thin plates are obtained by using the mold.
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JP2002153964A JP2003340553A (en) | 2002-05-28 | 2002-05-28 | Continuous casting method for magnesium alloy sheet |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006068424A1 (en) * | 2004-12-23 | 2006-06-29 | Research Institute Of Industrial Science & Technology | Apparatus for continuous casting of magnesium billet or slab using electromagnetic field and the method thereof |
JP2006239748A (en) * | 2005-03-04 | 2006-09-14 | Sumitomo Metal Ind Ltd | Method for producing magnesium alloy |
KR100721874B1 (en) | 2004-12-23 | 2007-05-28 | 재단법인 포항산업과학연구원 | Apparatus for continuous casting of Magnesium billet or slab using low frequency electromagnetic field |
JP2009113116A (en) * | 2007-11-01 | 2009-05-28 | Kme Germany Ag & Co Kg | Liquid-cooled mold for continuous casting of metals |
CN101773948A (en) * | 2007-03-19 | 2010-07-14 | 三井金属矿业株式会社 | Magnesium alloy plastic process product and manufacture method thereof |
-
2002
- 2002-05-28 JP JP2002153964A patent/JP2003340553A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006068424A1 (en) * | 2004-12-23 | 2006-06-29 | Research Institute Of Industrial Science & Technology | Apparatus for continuous casting of magnesium billet or slab using electromagnetic field and the method thereof |
KR100721874B1 (en) | 2004-12-23 | 2007-05-28 | 재단법인 포항산업과학연구원 | Apparatus for continuous casting of Magnesium billet or slab using low frequency electromagnetic field |
JP2008525197A (en) * | 2004-12-23 | 2008-07-17 | リサーチ インスティチュート オブ インダストリアル サイエンス アンド テクノロジー | Magnesium billet or slab continuous casting apparatus using electromagnetic field and manufacturing method |
JP2006239748A (en) * | 2005-03-04 | 2006-09-14 | Sumitomo Metal Ind Ltd | Method for producing magnesium alloy |
CN101773948A (en) * | 2007-03-19 | 2010-07-14 | 三井金属矿业株式会社 | Magnesium alloy plastic process product and manufacture method thereof |
JP2009113116A (en) * | 2007-11-01 | 2009-05-28 | Kme Germany Ag & Co Kg | Liquid-cooled mold for continuous casting of metals |
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