JPH09225596A - Twin roll continuous casting method and apparatus thereof - Google Patents
Twin roll continuous casting method and apparatus thereofInfo
- Publication number
- JPH09225596A JPH09225596A JP3788896A JP3788896A JPH09225596A JP H09225596 A JPH09225596 A JP H09225596A JP 3788896 A JP3788896 A JP 3788896A JP 3788896 A JP3788896 A JP 3788896A JP H09225596 A JPH09225596 A JP H09225596A
- Authority
- JP
- Japan
- Prior art keywords
- drum
- continuous casting
- molten metal
- porous body
- twin
- 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.)
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、双ドラム式連続鋳
造方法及び装置に係り、特に断面形状の良好な鋳片が得
られるように注湯を行う双ドラム式連続鋳造方法及び装
置に係る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twin-drum type continuous casting method and apparatus, and more particularly to a twin-drum type continuous casting method and apparatus for pouring molten metal so that a slab having a good cross-sectional shape can be obtained.
【0002】[0002]
【従来の技術】双ドラム式連続鋳造装置では、所定間隔
を保持して互に反対方向に回転する一対の冷却ドラムと
そのドラムの側面に摺接する一対のサイド堰とにより画
成した鋳型内に、注湯用浸漬ノズルを配置して前記鋳型
内に溶湯を供給し冷却ドラムの回転につれて薄板を鋳造
する。2. Description of the Related Art In a twin-drum type continuous casting machine, a casting mold is defined by a pair of cooling drums which rotate in opposite directions with a predetermined distance and a pair of side dams slidingly contacting the side surfaces of the cooling drums. The molten metal is supplied into the mold by pouring a dipping nozzle for pouring, and a thin plate is cast as the cooling drum rotates.
【0003】注湯用浸漬ノズルとしては、冷却ドラムの
周面に向けドラム軸方向に開口した溶湯吐出口と、内部
に多孔体を備えたものが用いられる。その注湯用浸漬ノ
ズルとして、従来種々の構造のものが提案されている。As the molten metal pouring nozzle, one having a molten metal discharge port opened in the drum axial direction toward the peripheral surface of the cooling drum and a porous body inside is used. As the pouring nozzle for pouring, various structures have been proposed.
【0004】例えば特開平06−126395号に開示
されたものは、図5及び図6に示すように、スリット状
の吐出口を有するノズル本体と、ノズル本体内に組み込
み溶湯を供給する中間ノズルとで構成されている。図5
及び図6において、1は注湯用浸漬ノズルで、2はその
吐出口、3は内部の多孔体であり、10は脱気孔であ
る。20は中間ノズルを示している。For example, as disclosed in Japanese Patent Laid-Open No. 06-126395, as shown in FIGS. 5 and 6, a nozzle body having a slit-shaped discharge port, and an intermediate nozzle for supplying molten metal incorporated in the nozzle body. It is composed of. FIG.
In FIG. 6, 1 is a dipping nozzle for pouring, 2 is its discharge port, 3 is an internal porous body, and 10 is a degassing hole. Reference numeral 20 denotes an intermediate nozzle.
【0005】このノズルでは、前記したように多孔体3
が注湯用浸漬ノズル1の内部に設けられ溶湯は該多孔体
3を介してノズル吐出口2へと抜けるようになってい
る。しかし、このノズルでは、多孔体3の空隙部はノズ
ル1内で殆んど同じ分布であり、ノズル吐出口2もほぼ
等間隔となっている。In this nozzle, as described above, the porous body 3 is used.
Is provided inside the pouring dipping nozzle 1 so that the molten metal can escape to the nozzle discharge port 2 through the porous body 3. However, in this nozzle, the void portions of the porous body 3 have almost the same distribution in the nozzle 1, and the nozzle discharge ports 2 are also at substantially equal intervals.
【0006】また、特開平07−60415号に開示さ
れている連続鋳造用偏平ノズルにおいても、定常操業中
に移動鋳型内の湯溜り部に浸漬される下部閉鎖端近傍の
冷却ドラム側両側壁に設けるスリット状ノズル孔が略同
じ寸法に形成されている。Also, in the flat nozzle for continuous casting disclosed in Japanese Patent Laid-Open No. 07-60415, on both side walls of the cooling drum near the lower closed end, which is immersed in the molten metal pool in the moving mold during steady operation. The slit-shaped nozzle holes to be provided are formed to have substantially the same size.
【0007】また、特開平07−68357号に開示さ
れた双ドラム式連続鋳造用偏平ノズルにおいては、図7
に示すように、その底部に多数の貫通孔30aを有する
整流耐火物30を配設し、その整流耐火物30における
孔面積率を中央で小さく両側部で大きくしている。上記
ノズルを用いて鋳造して得られた鋳片25の形状例を図
8に示しているが、鋳片断面の中央と端の間に中央部よ
り厚肉の個所を生じるなどの不具合があった。Further, in the flat nozzle for twin-drum type continuous casting disclosed in Japanese Patent Laid-Open No. 07-68357, FIG.
As shown in FIG. 3, a rectifying refractory material 30 having a large number of through holes 30a is arranged at the bottom thereof, and the hole area ratio of the rectifying refractory material 30 is small in the center and large in both side portions. An example of the shape of the cast slab 25 obtained by casting using the nozzle is shown in FIG. 8. However, there is a problem such that a thicker part than the center is formed between the center and the end of the slab cross section. It was
【0008】[0008]
【発明が解決しようとする課題】前記したように、双ド
ラム式連続鋳造においては、一対の冷却ドラムと一対の
サイド堰とで画成した鋳型内に注湯用浸漬ノズルを配置
して、鋳造時にはそのノズル吐出口を通して溶湯をドラ
ム胴面方向に流すが、ドラム外周面へ衝突する溶湯流れ
の速度がノズル端部のところで急激に低下するためドラ
ムの熱変形がいびつに生じ、結果として、鋳片のクラウ
ン形状(断面形状)が図8に示すようないびつとなり良
好な形状の鋳片を得ることができなかった。As described above, in twin-drum type continuous casting, casting is performed by arranging a pouring immersion nozzle in a mold defined by a pair of cooling drums and a pair of side dams. At times, the molten metal flows through the nozzle discharge port in the drum body surface direction, but the velocity of the molten metal flow colliding with the drum outer peripheral surface rapidly decreases at the nozzle end, causing thermal deformation of the drum, resulting in casting. The crown shape (cross-sectional shape) of the piece became uneven as shown in FIG. 8, and it was impossible to obtain a cast piece having a good shape.
【0009】本発明では、注湯流のドラム面への衝突速
度を一様に変化させて断面がなめらかなクラウン形状を
もつ鋳片を鋳造できるようにした双ドラム式連続鋳造方
法及びその為の連続鋳造装置を提供することを課題とし
ている。In the present invention, a twin-drum type continuous casting method and a twin-drum type continuous casting method capable of casting a slab having a smooth cross section by uniformly changing the collision velocity of the pouring flow on the drum surface are provided. An object is to provide a continuous casting device.
【0010】[0010]
【課題を解決するための手段】本発明は前記課題を解決
するため、冷却ドラムとサイド堰によって画成した鋳型
内に、冷却ドラムの周面に向けドラム軸方向に開口した
複数個の溶湯吐出口と内部に多孔体を備えた注湯用浸漬
ノズルを配置し、その注湯用浸漬ノズルの溶湯吐出口か
らの溶湯速度を中央部より端部で小さくして注湯する双
ドラム式連続鋳造方法を採用する。In order to solve the above problems, the present invention provides a mold defined by a cooling drum and a side weir, in which a plurality of molten metal spouts opened in the drum axial direction toward the peripheral surface of the cooling drum. A twin-drum continuous casting in which a pouring dipping nozzle equipped with a porous body inside the outlet and inside is placed, and the pouring is performed by making the molten metal speed from the molten metal discharge port of the pouring dipping nozzle smaller at the end than at the center Adopt the method.
【0011】本発明のこの双ドラム式連続鋳造方法によ
れば、注湯用浸漬ノズルの吐出口からの単位面積当りの
流量すなわち流速を中央部で大きく端部を小さくされる
ので溶湯の熱が水冷ドラム中へ流入する伝熱量が溶湯の
流れの影響を受けて、中央部で大きく端方向に進むに従
って徐々に小さくなり、なだらかな熱負荷の変化を生じ
るため、この熱負荷によってドラム内部に軸方向になだ
らかな温度分布を生み熱変形を生じるが、熱変形の曲線
がなだらかとなる。According to the twin-drum type continuous casting method of the present invention, the flow rate per unit area from the discharge port of the pouring dipping nozzle, that is, the flow velocity, is made large at the central portion and small at the end portion, so that the heat of the molten metal is generated. The amount of heat transfer that flows into the water-cooled drum is affected by the flow of the molten metal, and gradually decreases toward the end in the central part, causing a gradual change in heat load. Although a temperature distribution is generated in a certain direction and thermal deformation occurs, the thermal deformation curve becomes gentle.
【0012】前記した本発明による双ドラム式連続鋳造
方法においては、ノズル吐出口での単位面積当りの流量
すなわち流速を、中央部吐出口部に対する最端部吐出口
部の速度比で0.4〜0.8の範囲内とするのが好まし
い。すなわち、最端側の流速が中央部の0.8倍を越え
るとノズル端部での注湯流速差が大きくなり、鋳片の中
央部と端の間に中央部より厚肉の個所を生ずるからであ
る。また、最端側の流速が中央部の0.4倍以下になる
と、この場合も注湯流の流速差が大きくなり、鋳片形状
が前述の0.8倍を越えた場合と同様の形状となり不適
である。In the twin-drum type continuous casting method according to the present invention described above, the flow rate per unit area at the nozzle discharge port, that is, the flow velocity, is 0.4 in terms of the speed ratio of the endmost discharge port to the central discharge port. It is preferably within the range of 0.8. That is, when the flow velocity on the extreme end side exceeds 0.8 times that of the central portion, the difference in the pouring flow velocity at the nozzle end portion becomes large, and a thicker part than the central portion is formed between the central portion and the end of the slab. Because. Also, when the flow velocity on the extreme end side becomes 0.4 times or less that of the central part, the difference in flow velocity of the pouring flow also increases in this case, and the shape similar to that when the cast piece shape exceeds 0.8 times the above Is not suitable.
【0013】また、本発明は前記課題を解決するため、
冷却ドラムとサイド堰によって画成した鋳型内に、冷却
ドラムの周面に向けドラム軸方向に開口した複数個の溶
湯吐出口と内部に多孔体を備えた注湯用浸漬ノズルを配
置し、その注湯用浸漬ノズルの多孔体における中央部の
空隙率を端部の空隙率より大きく構成した双ドラム式連
続鋳造装置を提供する。In order to solve the above problems, the present invention provides
In the mold defined by the cooling drum and the side weir, a plurality of molten metal discharge ports opened in the drum axial direction toward the peripheral surface of the cooling drum and a molten metal pouring nozzle equipped with a porous body inside are arranged. Provided is a twin-drum type continuous casting device in which the porosity of the central portion of a porous body of a pouring nozzle for pouring molten metal is larger than the porosity of the end portions.
【0014】本発明による双ドラム式連続鋳造装置の実
施の一形態として、その注湯用浸漬ノズルの吐出口をド
ラム軸方向に複数個に分割し、各分割されたノズル吐出
口開口部からの単位面積当りの流量すなわち流速を中央
部を大きく、端部を小さくするよう、ノズル内部に流体
の抵抗となる多孔体の空隙率を違えて、その多孔体の抵
抗が中央部で小さくなるようにする。As an embodiment of the twin-drum type continuous casting apparatus according to the present invention, the discharge port of the pouring immersion nozzle is divided into a plurality of parts in the axial direction of the drum, and the divided nozzle discharge port openings are used. The flow rate per unit area, that is, the flow velocity, is made larger in the central part and smaller in the end part, so that the porosity of the porous body that becomes the resistance of the fluid inside the nozzle is changed so that the resistance of the porous body becomes smaller in the central part. To do.
【0015】本発明による双ドラム式連続鋳造装置で用
いる注湯用浸漬ノズルにおける多孔体の空隙率を前記し
たように変えるには、その多孔体における中央部の孔径
を端部の孔径より大きく形成させる等、適宜の構造のも
のを採用してよい。In order to change the porosity of the porous body in the dipping nozzle for pouring molten metal used in the twin drum type continuous casting apparatus according to the present invention as described above, the pore diameter of the central portion of the porous body is made larger than the pore diameter of the end portion. It is also possible to adopt an appropriate structure, such as
【0016】このように構成した本発明の双ドラム式連
続鋳造装置によれば、前記した本発明の双ドラム式連続
鋳造方法を効果的に実現し、なだらかな断面形状をもつ
鋳片を鋳造することができる。According to the twin-drum type continuous casting apparatus of the present invention thus constructed, the above-described twin-drum type continuous casting method of the present invention is effectively realized, and a slab having a gentle sectional shape is cast. be able to.
【0017】一方、双ドラム式連続鋳造装置では、ドラ
ムの軸方向長さに対して、ノズルのドラム軸方向長さが
短い場合、前記した本発明の鋳造方法によっても熱流速
のドラム軸方向分布に若干のむらを生じ、熱変形形状が
いびつ即ち中央部が薄くなることがある。そこで前記し
た本発明による双ドラム式連続鋳造装置においては、注
湯用浸漬ノズルの最端部の溶湯吐出口を冷却ドラムとサ
イド堰の交点に向けて開口させた構造とするのが好まし
い。On the other hand, in the twin-drum type continuous casting apparatus, when the length of the nozzle in the drum axial direction is shorter than the length of the drum in the axial direction, the heat flow velocity distribution in the drum axial direction is also obtained by the casting method of the present invention. There may be some unevenness in the shape, and the heat-deformed shape may be distorted, that is, thin in the central portion. Therefore, the twin-drum type continuous casting apparatus according to the present invention described above preferably has a structure in which the molten metal discharge port at the end of the pouring immersion nozzle is opened toward the intersection of the cooling drum and the side dam.
【0018】このような構造とすることによって注湯流
とドラム周面との相対速度が中央部から端部にかけて徐
々に変化するようになる。これによりドラムの熱変形形
状がなめらかとなり、良好な形状即ち幅方向の板厚が均
一又は中央部がやや厚い鋳片を得ることができる。With such a structure, the relative velocity between the pouring flow and the peripheral surface of the drum gradually changes from the central portion to the end portion. As a result, the heat-deformed shape of the drum becomes smooth, and a good shape, that is, a slab with a uniform plate thickness in the width direction or a slightly thick central portion can be obtained.
【0019】[0019]
【発明の実施の形態】以下、本発明による双ドラム式連
続鋳造方法及び装置について図1〜図4に示した実施の
形態に基づいて具体的に説明する。なお、以下の実施の
形態において、図5,図6に示した従来の装置と同じ構
成の部分には説明を簡単にするため同じ符号を付してあ
る。BEST MODE FOR CARRYING OUT THE INVENTION A twin-drum type continuous casting method and apparatus according to the present invention will be specifically described below with reference to the embodiments shown in FIGS. In the following embodiments, the same components as those of the conventional device shown in FIGS. 5 and 6 are designated by the same reference numerals for simplification of description.
【0020】(第1実施形態)まず、図1に示した本発
明の実施の第1形態による双ドラム式連続鋳造装置につ
いて説明する。図1において、6a,6bは一対の冷却
ドラムで、この冷却ドラム6a,6bと、その側面に摺
接している一対の耐熱セラミックス製のサイド堰耐火物
5a,5bを有するサイド堰5とによって鋳型が画成さ
れている。5cは、サイド堰に設けられたサイド堰ヒー
タである。前記鋳型内には、注湯用浸漬ノズル1が配置
されている。(First Embodiment) First, a twin-drum type continuous casting apparatus according to the first embodiment of the present invention shown in FIG. 1 will be described. In FIG. 1, 6a and 6b are a pair of cooling drums, and the cooling drums 6a and 6b and the side dam 5 having a pair of heat-resistant ceramic side dam refractories 5a and 5b slidably contacting the side surfaces of the cooling drums 6a and 6b Is defined. 5c is a side weir heater provided on the side weir. An immersion nozzle 1 for pouring molten metal is arranged in the mold.
【0021】この注湯用浸漬ノズル1には、鋳型内に溶
湯を供給する溶湯吐出口2が設けられている。この溶湯
吐出口2はドラム軸方向に複数個に分割してあり、分割
された各吐出口2の開口部からの単位面積当りの溶湯の
流量、すなわち流速を中央部を大きく、端部を小さくす
るようノズル内部に流体の抵抗となる多孔体3を設けて
いる。The immersion nozzle 1 for pouring molten metal is provided with a molten metal discharge port 2 for supplying the molten metal into the mold. The molten metal discharge port 2 is divided into a plurality in the axial direction of the drum, and the flow rate of the molten metal per unit area from the divided opening of each discharge port 2, that is, the flow velocity, is large in the central part and small in the end part. In order to do so, the porous body 3 which is a resistance of the fluid is provided inside the nozzle.
【0022】すなわち、多孔体3は、注湯用浸漬ノズル
1の中央部の多孔体3a、その両側の多孔体3b、及び
最端部の多孔体3cによって構成され、それら多孔体3
a,3b及び3cの孔7a,7b及び7cの直径はこの
順に小さくしてある。これによって、多孔体3を通過す
る溶湯に対する抵抗は中央部で小さく、端部で大きくす
る。なお、注湯用浸漬ノズル1の全体構造を図4に示し
てある。That is, the porous body 3 is constituted by the porous body 3a at the center of the pouring nozzle 1 for pouring the molten metal, the porous bodies 3b on both sides thereof, and the porous body 3c at the end, and these porous bodies 3
The diameters of the holes 7a, 7b and 7c of a, 3b and 3c are made smaller in this order. As a result, the resistance to the molten metal passing through the porous body 3 is low at the central portion and high at the end portions. The overall structure of the pouring nozzle 1 is shown in FIG.
【0023】このように図1に示した双ドラム式連続鋳
造装置においては、その注湯用浸漬ノズル1の吐出口2
をドラム軸方向に複数個に分割し、各分割された吐出口
2の開口部からの単位面積当りの流量すなわち流速を中
央部で大きく、端部を小さくするようノズル内部に設け
た多孔体3の空隙率を中央部で大きく、端部で小さくし
たので、溶湯の熱が冷却ドラム6a,6b中へ流入する
伝熱量が溶湯の流れの影響を受けて、中央部で大きく端
方向に進むに従って徐々に小さくなり、なだらかな熱負
荷の変化を生ずる。As described above, in the twin-drum type continuous casting apparatus shown in FIG. 1, the discharge port 2 of the dipping nozzle 1 for pouring the molten metal.
Is divided into a plurality of parts in the axial direction of the drum, and the flow rate per unit area, that is, the flow velocity from the opening of each of the divided discharge ports 2 is increased in the central part and is reduced in the end part. Since the porosity of is large in the central part and small in the end part, the heat transfer amount of the heat of the molten metal flowing into the cooling drums 6a, 6b is affected by the flow of the molten metal, and the amount of heat transfer increases in the central part toward the end. It gradually becomes smaller, causing a gentle change in heat load.
【0024】この熱負荷によって、冷却ドラム6a,6
b内部に軸方向になだらかな温度分布を生み熱変形を生
じるが、熱変形の曲線が滑らかとなる。なお、ノズル1
の内部に設けた多孔体3を同じ空隙率としても、中央部
で大きな目開きとすることにより流れが容易となり、端
部で小さな目開きとすることにより流れが中央部よりゆ
るやかとなり前記したと同様の結果を導出し得る。Due to this heat load, the cooling drums 6a, 6a
Although a gentle temperature distribution is generated in the inside of b in the axial direction to cause thermal deformation, the thermal deformation curve becomes smooth. The nozzle 1
Even if the porosity 3 provided in the inside is the same as the porosity, a large opening in the central portion facilitates the flow, and a small opening in the end causes the flow to be gentler than the central portion. Similar results can be derived.
【0025】吐出口2での単位面積当りの流量すなわち
流速は、中央部吐出口部と最端部吐出口部では速度比で
0.4〜0.8の範囲内で小さくした場合が良好であっ
た。すなわち、最端側の流速が中央部の0.8倍を越え
るとノズル端部での注湯流速差が大きくなり、鋳片に中
央部と端の間に中央部より厚肉の個所を生じた。また、
最端側の流速が中央部の0.4倍以下になると、この場
合も注湯流の流速差が大きくなり、鋳片形状が前述の
0.8倍を越えた場合と同様の形状となり不適となっ
た。The flow rate per unit area at the discharge port 2, that is, the flow velocity, is preferably small within the range of 0.4 to 0.8 in the speed ratio between the central discharge port and the end discharge port. there were. That is, when the flow velocity on the extreme end side exceeds 0.8 times that of the central part, the difference in the pouring flow velocity at the nozzle end becomes large, and a thicker part is formed between the central part and the end on the slab than the central part. It was Also,
If the flow velocity on the extreme end side becomes 0.4 times or less that of the central part, the difference in the flow velocity of the pouring flow also becomes large in this case, and the shape is the same as when the slab shape exceeds 0.8 times the above-mentioned, which is not suitable. Became.
【0026】(第2実施形態)次に、図3に示した本発
明の実施の第2形態による双ドラム式連続鋳造装置につ
いて説明する。この図3に示した装置で用いている注湯
用浸漬ノズル1では、そのノズル最端側の吐出口2の開
口方向を冷却ドラム軸直角方向ないし、湯面と冷却ドラ
ム胴面とサイド堰5の交点の間としている。また、中間
位置の吐出口2の方向を中央部吐出口2の方向(角度)
と最端側の吐出口2の方向(角度)の中間となるよう設
定しても良い。この注湯用浸漬ノズル1の全体構造は図
4に示したものと同じである。(Second Embodiment) Next, a twin-drum type continuous casting apparatus according to a second embodiment of the present invention shown in FIG. 3 will be described. In the pouring immersion nozzle 1 used in the apparatus shown in FIG. 3, the opening direction of the discharge port 2 at the end of the nozzle is perpendicular to the cooling drum axis, or the molten metal surface, the cooling drum body surface, and the side dam 5 are connected. It is between the intersection of. In addition, the direction of the discharge port 2 at the intermediate position is the direction (angle) of the central discharge port 2.
It may be set so as to be in the middle of the direction (angle) of the discharge port 2 on the end side. The entire structure of this pouring immersion nozzle 1 is the same as that shown in FIG.
【0027】双ドラム式連続鋳造装置において、ドラム
の軸方向長さに対して、注湯用浸漬ノズルのドラム軸方
向長さが短い場合は、熱流速のドラム軸方向分布に若干
のむらを生じ易く、鋳造される鋳片の熱変形形状がいび
つ即ち中央部が薄くなることがある。In the twin-drum type continuous casting apparatus, when the length of the immersion nozzle for pouring the molten metal in the axial direction of the drum is shorter than the axial length of the drum, the distribution of the heat flow velocity in the axial direction of the drum tends to be slightly uneven. The heat-deformed shape of the cast slab may be distorted, that is, thin in the central portion.
【0028】そこで、図3のようにノズル1の最端側ノ
ズル吐出口の開口方向を冷却ドラム軸に対し直角方向又
はドラム周面とサイド堰の交点の方向とし、注湯流とド
ラム周面との相対速度が中央部から端部にかけて徐々に
変化するようにした。これによりドラムの熱変形形状が
なめらかとなり、良好な形状、即ち、幅方向の板厚が均
一又は中央部がやや厚い鋳片を得るようになる。Therefore, as shown in FIG. 3, the opening direction of the nozzle discharge port at the end of the nozzle 1 is set to the direction perpendicular to the cooling drum axis or the direction of the intersection of the drum peripheral surface and the side weir, and the pouring flow and the drum peripheral surface. The relative speed of and is gradually changed from the central part to the end part. As a result, the heat-deformed shape of the drum becomes smooth, and a good shape, that is, a slab having a uniform plate thickness in the width direction or a slightly thick central portion can be obtained.
【0029】[0029]
【実施例】次に、本発明による双ドラム式連続鋳造方法
の実施例について説明する。EXAMPLES Next, examples of the twin-drum type continuous casting method according to the present invention will be described.
【0030】(第1実施例)双ドラムとして直径120
0mmφ, 幅800mmの冷却ドラム2個を用いた。ノズル
の形状は図1,図4に示すものを用いたが、ノズル浸漬
部の軸方向長さ680mm、吐出口2の開口幅を中央で2
00mm、外端部のものを50mm、その間のものを140
mmとし、多孔体(ポーラスセラミックスフィルター)3
a,3b,3cの孔7a,7b,7c、直径を中央の多
孔体3aで直径6mmφ、外端部の多孔体3cで3.9mm
φ、その間の多孔体3bを5mmφとして、空隙率を20
%となるようジグザグ状に配列した。(First Embodiment) A twin drum having a diameter of 120
Two cooling drums with a diameter of 0 mm and a width of 800 mm were used. The nozzle shape used was that shown in FIGS. 1 and 4, but the axial length of the nozzle immersion part was 680 mm and the opening width of the discharge port 2 was 2 at the center.
00mm, 50mm for the outer edge, 140 for those in between
mm, porous body (porous ceramics filter) 3
Holes 7a, 7b, 7c of a, 3b, 3c, the diameter of the central porous body 3a is 6 mmφ, and the diameter of the outer end porous body 3c is 3.9 mm.
φ, the porous body 3b between them is 5 mmφ, and the porosity is 20
They were arranged in a zigzag pattern so that the ratio becomes%.
【0031】鋳造時は湯面幅(湯面と接触するドラム間
距離)を280mmに保ち、鋳造速度60m/min で、本ノ
ズル先端部を湯面内に浸漬(挿入)した状態で連続鋳造
した。During casting, the width of the molten metal surface (distance between the drums in contact with the molten metal surface) was kept at 280 mm, continuous casting was carried out at a casting speed of 60 m / min with the tip of the nozzle immersed (inserted) in the molten metal surface. .
【0032】その結果、冷却ドラム6a,6bの外周部
の変形は鋳片クラウン形状が一様な曲率変化になるよう
に生じ、図2に示すような鋳片形状となり、鋳片中央部
肉厚tc が鋳片端部肉厚te ,te ’より厚くなり、か
つ、中間部の肉厚tm ,tm’はtc とte ,te ’の
中間値となる良好形状を示した。As a result, the outer peripheral portions of the cooling drums 6a and 6b are deformed so that the slab crown shape has a uniform curvature change, and the slab shape as shown in FIG. 2 is obtained. Tc was thicker than the slab end wall thicknesses te and te ', and the intermediate wall thicknesses tm and tm' were intermediate values between tc and te, te ', indicating a good shape.
【0033】また、多孔体3a,3b,3cの孔7a,
7b,7cの直径を中央部で6mmφ、最端部1mmφ、空
隙率を20%とした場合も良好な鋳片形状を得た。Further, the holes 7a of the porous bodies 3a, 3b, 3c,
Even when the diameters of 7b and 7c were 6 mmφ at the central portion, 1 mmφ at the outermost portion and the porosity was 20%, a good cast shape was obtained.
【0034】(第2実施例)冷却ドラムとして直径12
00mmφ,幅1330mmのものを用いた。注湯用浸漬ノ
ズル1は第1実施例のものと同様のものを用いたが、た
だ幅50mmの外端部の吐出口2を湯面と冷却ドラム胴面
及びサイド堰の交点部からドラム周面上で100mm中央
側となるよう吐出方向を設定し鋳造した。この鋳造結
果、ドラムの熱変形は一様な曲率変化を示し鋳片も図2
に示すような良好な形状のものが得られた。(Second Embodiment) A cooling drum having a diameter of 12
The one having a diameter of 00 mm and a width of 1330 mm was used. The same dipping nozzle 1 for pouring was used as that of the first embodiment, except that the discharge port 2 at the outer end having a width of 50 mm was set at the drum circumference from the intersection of the molten metal surface with the cooling drum body surface and the side dam. Casting was performed by setting the discharge direction so that the center side was 100 mm on the surface. As a result of this casting, the thermal deformation of the drum shows a uniform change in curvature, and the slab also shows in FIG.
A good shape was obtained as shown in.
【0035】(第3実施例)第1実施例において、多孔
体3の直径を中央の多孔体3aで6mmφ、外端部の多孔
体3cで4mmφ、その間の多孔体3bを5mmφとすると
共に、空隙率を中央の多孔体3aで30%とし、外端の
多孔体3cと中間部の多孔体3bでは孔の個数を同じと
して、空隙率はそれぞれ13.3%,20.8%として
鋳造に供した。(Third Embodiment) In the first embodiment, the diameter of the porous body 3 is 6 mmφ for the central porous body 3a, 4 mmφ for the outer end porous body 3c, and 5 mmφ for the porous body 3b therebetween. The porosity is set to 30% in the central porous body 3a, the number of holes is the same in the outer end porous body 3c and the intermediate porous body 3b, and the porosity is set to 13.3% and 20.8%, respectively. I served.
【0036】この鋳造結果に於てもドラムの熱変形は一
様な曲率変化を示し、図2に示すような良好な形状の鋳
片を得た。また、ノズル中央部の吐出口部の多孔体3a
を5mmφの孔にて空隙率を20.8%とし、最端部ノズ
ル吐出口の多孔体3cを直径5mmφの孔とし、空隙率を
16.6%とした場合も良好な鋳片形状を得た。Also in this casting result, the thermal deformation of the drum showed a uniform curvature change, and a slab having a good shape as shown in FIG. 2 was obtained. In addition, the porous body 3a of the discharge port at the center of the nozzle
With a hole of 5 mmφ and a porosity of 20.8%, and the porous body 3c of the nozzle discharge port at the end has a diameter of 5 mmφ and a porosity of 16.6%, a good cast shape can be obtained. It was
【0037】[0037]
【発明の効果】以上説明したように、本発明による双ド
ラム式連続鋳造方法及び装置においては、注湯用浸漬ノ
ズルの溶湯吐出口からの溶湯速度を中央部より端部で小
さくして注湯するようにしているので、単位面積当りの
流量すなわち流速は中央部で大きく端部を小さくされ
る。As described above, in the twin-drum type continuous casting method and apparatus according to the present invention, the molten metal velocity from the molten metal discharge port of the immersion nozzle for pouring is made smaller at the end portion than at the central portion. Therefore, the flow rate per unit area, that is, the flow velocity, is large in the central portion and small in the end portion.
【0038】従って、溶湯の熱が水冷ドラム中へ流入す
る伝熱量は、溶湯の流れの影響を受けて、中央部で大き
く端方向に進むに従って徐々に小さくなりなだらかな熱
負荷の変化を生じ、これによって水冷ドラムの一様な熱
変形形状を得ることができるようになり、良好な形状の
鋳片が得られるようになった。Therefore, the heat transfer amount of the heat of the molten metal flowing into the water cooling drum is affected by the flow of the molten metal, and gradually decreases toward the end in the central portion, causing a gradual change in the heat load, As a result, a uniform heat-deformed shape of the water cooling drum can be obtained, and a slab having a good shape can be obtained.
【図1】本発明の実施の第1形態による双ドラム式連続
鋳造装置における注湯用浸漬ノズルの構造を示す平面
図。FIG. 1 is a plan view showing a structure of a pouring immersion nozzle in a twin-drum type continuous casting apparatus according to a first embodiment of the present invention.
【図2】図1に示した注湯用浸漬ノズルを用いて鋳造し
た鋳片の断面図。FIG. 2 is a cross-sectional view of a slab cast using the immersion nozzle for pouring shown in FIG.
【図3】本発明の実施の第2形態による双ドラム式連続
鋳造装置における注湯用浸漬ノズルの構造を示す平面
図。FIG. 3 is a plan view showing the structure of a pouring immersion nozzle in a twin-drum type continuous casting apparatus according to a second embodiment of the present invention.
【図4】本発明の実施の一形態による双ドラム式連続鋳
造装置における注湯用浸漬ノズルを一部破断して示す側
面図。FIG. 4 is a side view showing a partially broken molten metal pouring nozzle in the twin-drum type continuous casting apparatus according to the embodiment of the present invention.
【図5】従来の双ドラム式連続鋳造装置における注湯用
浸漬ノズルを示す図4と同様の側面図。FIG. 5 is a side view similar to FIG. 4, showing a molten metal pouring immersion nozzle in a conventional twin-drum type continuous casting apparatus.
【図6】図5に示したノズルの紙面に垂直方向の断面
図。6 is a cross-sectional view of the nozzle shown in FIG. 5 in a direction perpendicular to the paper surface.
【図7】従来の双ドラム式連続鋳造装置における注湯用
浸漬ノズルの他の例を示す図面で、(a)は断面図、
(b)は平面図。FIG. 7 is a view showing another example of the immersion nozzle for pouring molten metal in the conventional twin-drum type continuous casting apparatus, in which (a) is a sectional view,
(B) is a plan view.
【図8】従来の双ドラム式連続鋳造装置で鋳造される鋳
片の断面形状を示す断面図。FIG. 8 is a sectional view showing a sectional shape of a cast piece cast by a conventional twin-drum type continuous casting apparatus.
1 注湯用浸漬ノズル 2 吐出口 3,3a,3b,3c 多孔体 4 溶湯 5 サイド堰 5a,5b サイド堰耐火物 5c サイド堰ヒータ 6a,6b 冷却ドラム 10 脱気孔 20 中間ノズル 1 Immersion nozzle for pouring 2 Discharge port 3, 3a, 3b, 3c Porous body 4 Molten metal 5 Side dam 5a, 5b Side dam refractory 5c Side dam heater 6a, 6b Cooling drum 10 Degassing hole 20 Intermediate nozzle
Claims (5)
する一対の冷却ドラムと同ドラムの側面に摺接する一対
のサイド堰とにより画成した鋳型内に、同ドラムの周面
に向けドラム軸方向に開口した複数個の溶湯吐出口と内
部に多孔体を備えた注湯用浸漬ノズルを配置し、前記冷
却ドラムの回転につれ薄板を鋳造する連続鋳造方法であ
って、前記注湯用浸漬ノズルの溶湯吐出口からの溶湯速
度を中央部より端部で小さくして注湯することを特徴と
する双ドラム式連続鋳造方法。1. A mold, which is defined by a pair of cooling drums that rotate in opposite directions at a predetermined interval and that rotate in mutually opposite directions, and a pair of side dams that slidably contact the side surfaces of the drum, facing the peripheral surface of the drum. A continuous casting method in which a plurality of molten metal discharge ports opened in the drum axial direction and a molten metal pouring immersion nozzle having a porous body inside are arranged, and a thin plate is cast as the cooling drum rotates. A twin-drum type continuous casting method characterized in that the molten metal is discharged from the molten metal discharge port of the dipping nozzle at a smaller speed in the end portion than in the central portion.
4〜0.8とする請求項1記載の双ドラム式連続鋳造方
法。2. The flow velocity ratio of the end portion to the central portion is set to 0.
The twin-drum type continuous casting method according to claim 1, wherein the twin-drum type continuous casting method is 4 to 0.8.
する一対の冷却ドラムと同ドラムの側面に摺接する一対
のサイド堰とにより画成した鋳型内に、同ドラムの周面
に向けドラム軸方向に開口した複数個の溶湯吐出口と内
部に多孔体を備えた注湯用浸漬ノズルを配置し、前記冷
却ドラムの回転につれ薄板を鋳造する連続鋳造装置であ
って、前記多孔体は、中央部の空隙率を端部の空隙率よ
り大きく構成したことを特徴とする双ドラム式連続鋳造
装置。3. A mold defined by a pair of cooling drums which rotate in opposite directions at a predetermined interval and which rotate in mutually opposite directions, and a pair of side dams slidably contacting the side surfaces of the drum, facing the peripheral surface of the drum. A continuous casting device for arranging a plurality of molten metal discharge ports opened in the drum axial direction and a pouring immersion nozzle having a porous body inside, and a thin plate is cast as the cooling drum rotates, wherein the porous body is A twin-drum type continuous casting apparatus characterized in that the porosity of the central portion is made larger than the porosity of the end portions.
径より大きくした請求項3記載の双ドラム式連続鋳造装
置。4. The twin-drum type continuous casting apparatus according to claim 3, wherein the hole diameter of the central portion of the porous body is larger than the hole diameter of the end portions.
出口を前記冷却ドラムとサイド堰の交点に向けて開口さ
せた請求項3記載の双ドラム式連続鋳造装置。5. The twin-drum type continuous casting apparatus according to claim 3, wherein the molten metal discharge port at the end of the pouring immersion nozzle is opened toward the intersection of the cooling drum and the side dam.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3788896A JPH09225596A (en) | 1996-02-26 | 1996-02-26 | Twin roll continuous casting method and apparatus thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3788896A JPH09225596A (en) | 1996-02-26 | 1996-02-26 | Twin roll continuous casting method and apparatus thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH09225596A true JPH09225596A (en) | 1997-09-02 |
Family
ID=12510087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3788896A Withdrawn JPH09225596A (en) | 1996-02-26 | 1996-02-26 | Twin roll continuous casting method and apparatus thereof |
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Country | Link |
---|---|
JP (1) | JPH09225596A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100368283B1 (en) * | 1998-12-21 | 2003-03-17 | 주식회사 포스코 | A submerged entty nozzle in strip caster of twin roll |
JP2007203337A (en) * | 2006-02-02 | 2007-08-16 | Ishikawajima Harima Heavy Ind Co Ltd | Twin-roll casting machine |
WO2008155914A1 (en) * | 2007-06-19 | 2008-12-24 | Ihi Corporation | Twin-roll casting machine |
KR101067479B1 (en) * | 2003-12-24 | 2011-09-27 | 주식회사 포스코 | Submerged entry nozzle for the twin roll strip casting apparatus |
KR101110251B1 (en) * | 2004-12-28 | 2012-04-05 | 주식회사 포스코 | A stabilized supply of molten steel in twin roll strip casting process |
-
1996
- 1996-02-26 JP JP3788896A patent/JPH09225596A/en not_active Withdrawn
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100368283B1 (en) * | 1998-12-21 | 2003-03-17 | 주식회사 포스코 | A submerged entty nozzle in strip caster of twin roll |
KR101067479B1 (en) * | 2003-12-24 | 2011-09-27 | 주식회사 포스코 | Submerged entry nozzle for the twin roll strip casting apparatus |
KR101110251B1 (en) * | 2004-12-28 | 2012-04-05 | 주식회사 포스코 | A stabilized supply of molten steel in twin roll strip casting process |
JP2007203337A (en) * | 2006-02-02 | 2007-08-16 | Ishikawajima Harima Heavy Ind Co Ltd | Twin-roll casting machine |
WO2008155914A1 (en) * | 2007-06-19 | 2008-12-24 | Ihi Corporation | Twin-roll casting machine |
JP2009000691A (en) * | 2007-06-19 | 2009-01-08 | Ihi Corp | Twin-roll casting machine |
AU2008264764B2 (en) * | 2007-06-19 | 2010-08-19 | Ihi Corporation | Twin-roll casting machine |
US8113267B2 (en) | 2007-06-19 | 2012-02-14 | Ihi Corporation | Twin-roll casting machine |
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