JPS6030553A - Continuous casting method of ingot - Google Patents
Continuous casting method of ingotInfo
- Publication number
- JPS6030553A JPS6030553A JP13090383A JP13090383A JPS6030553A JP S6030553 A JPS6030553 A JP S6030553A JP 13090383 A JP13090383 A JP 13090383A JP 13090383 A JP13090383 A JP 13090383A JP S6030553 A JPS6030553 A JP S6030553A
- Authority
- JP
- Japan
- Prior art keywords
- ingot
- mold
- molten metal
- pouring
- nozzle
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
ミニウム等の鋳塊を連続的に鋳造するに当シ、その組織
を改善し、該鋳塊によって得られる圧延材の機械的特性
を良好ならしめることのできる方法を提供しようとする
ものである。DETAILED DESCRIPTION OF THE INVENTION Provided is a method for continuously casting an ingot such as minium, improving its structure and improving the mechanical properties of a rolled material obtained from the ingot. This is what I am trying to do.
アルミニウム等の鋳塊を連続鋳造するには一般的に上下
方向において開放された枠形の金属製水冷鋳型を用い、
該鋳型下部に受台を装入した条件下で該受台上に金属溶
湯を連続的に供給し、鋳型内に凝固した鋳塊を前記受台
を下降させて鋳型下部から引出し、このようにして引出
された鋳塊に冷却水を施して凝固させる方法が採られて
いる。ところがこのような連続的鋳造法(新制半連続鋳
造を含む)においては鋳塊は外周部から順次に冷却され
中心部に向うほど冷却速贋が遅くなるため中心部では結
晶粒度やデンドライトアームスベーシング(以下DAS
という)などの組織が粗くなる。又同じ理由で中高力合
金角型鋳塊の中心部には多数のシュリンケージポロシテ
ィが発生する。斯様な関係は鋳塊の厚さが増すほど顕著
であって、上記のように外皮部と中心部と組織を異にし
た鋳塊を用いて製造筋れた圧延板などに2ける中心部の
機械的性質は表皮部に比較して劣ることになシ、何れに
しても所期するような特性を得難いと七となる。To continuously cast ingots such as aluminum, generally a frame-shaped metal water-cooled mold that is open in the vertical direction is used.
Under the condition that a pedestal is inserted into the lower part of the mold, molten metal is continuously supplied onto the pedestal, and the ingot solidified in the mold is pulled out from the lower part of the mold by lowering the pedestal. The method used is to apply cooling water to the ingot that has been drawn out and solidify it. However, in such continuous casting methods (including the new semi-continuous casting method), the ingot is cooled sequentially from the outer periphery, and the cooling rate slows down toward the center. (Hereinafter referred to as DAS
) and other structures become coarse. Also, for the same reason, a large number of shrinkage porosity occurs in the center of a rectangular ingot of medium-high strength alloy. Such a relationship becomes more pronounced as the thickness of the ingot increases, and as mentioned above, the center part of a rolled plate, etc. manufactured using an ingot with different structures between the outer skin and the center part. The mechanical properties of the skin are inferior to those of the skin, and in any case, it is difficult to obtain the desired properties.
本発明は上記したような実情に鑑み研究を重ねて開発さ
れたものであって、アルミニウム鋳塊の如き全連続的に
鋳造するに当シ、水冷鋳型内に供給される溶湯を直接的
に鋳型内鋳塊の中心部に向けて吐出させると共に、分配
給湯ノズルによる給湯を併用して鋳造することを提案す
るものであり、それによって表層部から中心部まで略一
様で緻密な組織を形成し、又前記シ壬ンケージボロシテ
ィなどの発生をなからしめようとするものでるる。The present invention has been developed through repeated research in view of the above-mentioned circumstances, and is suitable for casting molten metal directly into a water-cooled mold when casting aluminum ingots completely continuously. It is proposed to discharge molten metal toward the center of the inner ingot and to use a dispensing molten metal nozzle to supply the molten metal, thereby forming a nearly uniform and dense structure from the surface layer to the center. There are also attempts to eliminate the occurrence of the above-mentioned cage volocity.
斯かる本発明について仔細を説明すると、添付図面には
上記のような本発明方法を角型鋳塊を得る場合の装置と
して示されておシ、タンディツシュ1には鋳型5内に形
成される鋳塊8の中心部に向けて直接給湯用ノズル2が
上記鋳型5内の湯面下部に相当に深く挿入されていてそ
の挿入深さ位置でタンディツシュ1からの溶@を直接的
に吐出するように成っている。又このようなノズル2の
両側にはフロート4を介して鋳型5内に給湯する分配給
湯ノズル3.3が対称的に配設され、同時に給湯を行わ
しめておシ、鋳型5内溶湯7にはフィルター6を設け、
又鋳型5には冷却水が送入されて冷却効果上溶湯に与え
ると共にその下部に形成されたノズル9から引き出され
る鋳塊8の周面に冷却水を直接に供給して冷却するよう
に成っている。To explain the present invention in detail, the attached drawing shows the method of the present invention as described above as an apparatus for obtaining a square ingot. A direct hot water supply nozzle 2 is inserted considerably deep below the hot water level in the mold 5 toward the center of the lump 8, so that the molten water from the tundish 1 is directly discharged at the insertion depth position. It is made. Also, distributing hot water nozzles 3.3 for supplying hot water into the mold 5 via the float 4 are arranged symmetrically on both sides of such nozzle 2. A filter 6 is provided,
In addition, cooling water is fed into the mold 5 and applied to the molten metal for cooling effect, and the cooling water is directly supplied to the circumferential surface of the ingot 8 drawn out from a nozzle 9 formed at the bottom of the mold 5 to cool it. ing.
上記したような装置によシ実施される本発明方法を更に
説明すると、給湯用ノズル2から供給される溶の量が多
いほど鋳塊中心部における同−深さ位置の溶湯温度が上
昇し、一方鋳塊8の表面温度はそれぞれの位置において
同様であることから相対的に中心部に対して与えられる
冷却速度が遠くなシ該中心部において緻密な結晶組織を
形成することができる。然してこのようにして鋳塊中心
部への給湯量が大となると、分配ノズル3から分配供給
きれる溶湯量が少なくなシ鋳塊表層部が冷えすぎてコー
ルドシャット(凝固によるくびn)が発生した9、又浮
遊晶も生じ易いと七となるので極端にノズル2からの紬
@量を増大することは不適切でろって、それらの関係は
鋳塊の形状や大きさによっても変動するが、一般的にノ
ズル2による給湯量は鋳型5内への給湯量の35〜70
%、特に40〜60%が好ましく、このようにすること
によって、全体全一様な結晶組織状態として鋳造するこ
とができる。なお上記のようにすることにょシ供給され
る溶湯の湿灰が同じであっても鋳型表層部に2ける温度
が低くなるので全量をフロート全周いたノズルから吐出
させる従来法に比し表層部にフェザ−晶が発生し難くな
る利点も確認はれている。直接給湯ノズル1は少なくと
もフロートキないし分配ノズル3よシは長く鋳型自溶湯
中に挿入することが必要でるり、フィルター6について
も従来のものよシ粗いものを用いることが効果的である
。To further explain the method of the present invention carried out by the above-mentioned apparatus, the larger the amount of melt supplied from the hot water supply nozzle 2, the higher the temperature of the melt at the same depth in the center of the ingot; On the other hand, since the surface temperature of the ingot 8 is the same at each position, a dense crystal structure can be formed in the center because the cooling rate applied to the center is relatively far away. However, if the amount of molten metal supplied to the center of the ingot increases in this way, the amount of molten metal that can be distributed and supplied from the distribution nozzle 3 will be small, and the surface layer of the ingot will become too cold, causing a cold shut (neck due to solidification). 9, and 7 if floating crystals are likely to occur, so it would be inappropriate to increase the amount of pongee from nozzle 2 to an extreme degree, although the relationship between these will vary depending on the shape and size of the ingot. Generally, the amount of hot water supplied by the nozzle 2 is 35 to 70 times the amount of hot water supplied into the mold 5.
%, particularly 40 to 60%, and by doing so, it is possible to cast with a uniform crystal structure throughout. In addition, even if the wet ash of the molten metal supplied as described above is the same, the temperature at the surface layer of the mold will be lower than that of the conventional method in which the entire amount is discharged from a nozzle placed around the entire circumference of the float. The advantage that feather crystals are less likely to occur has also been confirmed. The direct hot water supply nozzle 1 needs to be inserted into the mold self-molten metal for a longer time than the float or distribution nozzle 3, and it is effective to use a filter 6 that is coarser than the conventional one.
上記したような不発明によるものの具体的な実施例につ
いて説明すると以下の如くである。A specific example of the above-mentioned invention based on the invention will be described below.
内法が508X1060mmの角形矩形断面の鋳塊8を
連続鋳造するようにきれた水冷鋳型5に対して第1図の
ようにタンディツシュ1から直接給湯ノズル2と分配ノ
ズル3.3にょシ給湯し、鋳型5内溶湯面から直接給湯
ノズル2が40111111の深さまで挿入された状態
で、該ノズル2からは鋳型内紛湯量の52%を供給し、
分配ノズル3.3からはそれぞれ約24%を供給する条
件で99.5%アルミニウムを半連続鋳造した。鋳型5
底部からの鋳塊引出し速度は7 、5 (yl /fi
l nである。As shown in FIG. 1, hot water is supplied directly from the tundish 1 to the hot water supply nozzle 2 and the distribution nozzle 3.3 to the water-cooled mold 5, which has been cut to continuously cast an ingot 8 having a rectangular cross section with an internal diameter of 508 x 1060 mm. With the hot water supply nozzle 2 inserted directly from the molten metal surface in the mold 5 to a depth of 40111111, 52% of the amount of molten metal in the mold is supplied from the nozzle 2,
99.5% aluminum was semi-continuously cast, with each distribution nozzle 3.3 supplying approximately 24%. Mold 5
The ingot withdrawal speed from the bottom is 7,5 (yl/fi
It is l n.
即ちこのようにして得られた鋳塊の中心部における結晶
組織は第2図の顕微鏡写真の如くであり、微細な組織と
なっていることは明らかである。これに対し直接給湯ノ
ズル2′?L使用しないでフロートを用いたノズルのみ
PCよる従来法によって同じアルミニウムを同じ速度で
半連続鋳造したときの鋳塊中心部の結晶組織は8g3図
の通シで心って、本発明方法によるものの結晶組織緻密
性は明確である。That is, the crystal structure in the center of the ingot thus obtained is as shown in the micrograph of FIG. 2, and it is clear that the structure is fine. On the other hand, direct hot water supply nozzle 2'? When the same aluminum was semi-continuously cast at the same speed by the conventional method using PC only with a nozzle using a float without using L, the crystal structure in the center of the ingot was 8g. The density of the crystal structure is clear.
以上説明したような本発明によるときはこの種連続的鋳
造によって得られる鋳塊の結晶組織を表層部から中心部
まで略一様な緻密状態として適切に形成し、又ンユリ7
ケージポロシテイなどの発生をなからしめて優質の鋳塊
を提供し、それによって斯様な鋳塊を用いて得られる板
材その他の圧延材等における機械的特性その他を良好と
することができるものでろって、工業的にその効果の大
きい発明である。According to the present invention as explained above, the crystal structure of the ingot obtained by this type of continuous casting is appropriately formed into a substantially uniform dense state from the surface layer to the center, and
It is possible to provide an ingot of superior quality by eliminating the occurrence of cage porosity, thereby improving the mechanical properties and other properties of plate materials and other rolled materials obtained using such an ingot. This is an invention with great industrial effects.
図面は本発明の技術的内容を示すものであって、第1図
は本発明方法を実施するための装置の1例を示した断面
的説明図、第2図は本発明方法によって得られた鋳塊の
1例についてその中心部の結晶組織を示した顕微鏡写真
、第3図はその比較例によるものの顕微鏡写真であって
、何れも倍率50倍を以て示すものである。
父上記第1図において、1はタンディツシュ、2は直接
給湯ノズル、3は分配ノズル、4はフロート、5は水冷
鋳型、6はフィルター、7#′i溶湯、8は鋳塊、9は
冷却水を示すものである。
第 / 圓The drawings show the technical contents of the present invention, and FIG. 1 is a cross-sectional explanatory diagram showing an example of an apparatus for carrying out the method of the present invention, and FIG. A microscopic photograph showing the crystal structure of the center of one example of an ingot, and FIG. 3 is a microscopic photograph of a comparative example thereof, both of which are shown at a magnification of 50 times. In Fig. 1 above, 1 is a tundish, 2 is a direct hot water supply nozzle, 3 is a distribution nozzle, 4 is a float, 5 is a water-cooled mold, 6 is a filter, 7 is a molten metal, 8 is an ingot, and 9 is a cooling water. This shows that. No. / Circle
Claims (1)
て、前記鋳型円中心部に設けられた直接給湯ノズルと分
配ノズルによって上記溶湯を供給し、前記直接給湯ノズ
ルによる給湯量を鋳型内給湯全量の35〜70%とした
ことを特徴とする鋳塊の連続的鋳造法。When supplying molten metal into a water-cooled mold to continuously obtain an ingot, the molten metal is supplied through a direct hot water supply nozzle and a distribution nozzle provided at the center of the mold circle, and the amount of hot water supplied by the direct hot water nozzle is controlled. A method for continuous casting of an ingot, characterized in that the amount of hot water supplied in the mold is 35 to 70% of the total amount of hot water supplied in the mold.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13090383A JPS6030553A (en) | 1983-07-20 | 1983-07-20 | Continuous casting method of ingot |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13090383A JPS6030553A (en) | 1983-07-20 | 1983-07-20 | Continuous casting method of ingot |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6030553A true JPS6030553A (en) | 1985-02-16 |
JPH0323257B2 JPH0323257B2 (en) | 1991-03-28 |
Family
ID=15045414
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13090383A Granted JPS6030553A (en) | 1983-07-20 | 1983-07-20 | Continuous casting method of ingot |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6030553A (en) |
-
1983
- 1983-07-20 JP JP13090383A patent/JPS6030553A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH0323257B2 (en) | 1991-03-28 |
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