JPH05245594A - Twin roll type strip continuous casting method - Google Patents
Twin roll type strip continuous casting methodInfo
- Publication number
- JPH05245594A JPH05245594A JP8498692A JP8498692A JPH05245594A JP H05245594 A JPH05245594 A JP H05245594A JP 8498692 A JP8498692 A JP 8498692A JP 8498692 A JP8498692 A JP 8498692A JP H05245594 A JPH05245594 A JP H05245594A
- Authority
- JP
- Japan
- Prior art keywords
- casting
- roll
- continuous casting
- roll type
- slab
- 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.)
- Withdrawn
Links
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、薄板鋳片を製造する双
ロール式連続鋳造において、鋳造初期の非定常鋳片の発
生を防止する鋳造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twin roll type continuous casting method for producing thin plate cast pieces, and relates to a casting method for preventing the occurrence of unsteady cast pieces at the initial stage of casting.
【０００２】[0002]
【従来の技術】内側に向って回転する２個のロール間
に、注湯ノズルを介して溶融金属を注入して金属の薄板
を鋳造する双ロール式薄板連続鋳造方法は、ベッセマー
法として知られている。2. Description of the Related Art A twin-roll type thin plate continuous casting method in which a molten metal is cast between two rolls rotating inwardly through a pouring nozzle to cast a thin metal plate is known as a Bessemer method. ing.
【０００３】この鋳造方法は、図２に示すように２個の
ロール１を適当な間隔で配置し、双ロール１間に形成さ
れる溶湯プール２に上方から溶融金属を注入しながら内
側に回転し、ロール表面に凝固シェル３を形成させてこ
の凝固シェルを接合し、さらに圧下して所定の厚さの薄
板鋳片４を製造するものである。In this casting method, as shown in FIG. 2, two rolls 1 are arranged at appropriate intervals, and a molten metal pool 2 formed between twin rolls 1 is rotated inward while pouring molten metal from above. Then, the solidified shell 3 is formed on the roll surface, the solidified shell is joined, and further pressed to manufacture the thin plate cast piece 4 having a predetermined thickness.
【０００４】ところで鋳造初期においては、ロールの温
度が一定化せず鋳造中にロールクラウンに変動をきた
し、また形成される凝固シェルの厚さも一定せず、鋳造
が定常化されるまでの間の鋳片の形状に厚さのばらつき
や不均衡を生じ、またこれが鋳片の割れやバルジングの
原因ともなっていた。By the way, in the initial stage of casting, the roll temperature is not constant and the roll crown fluctuates during casting, and the thickness of the solidified shell to be formed is not constant. The shape of the slab had thickness variations and imbalances, which also caused cracks and bulging of the slab.
【０００５】[0005]
【発明が解決しようとする課題】これら課題に対処する
ために、例えば特開昭６０−１３７５６２号公報の薄板
連続鋳造方法において、２本の水冷ロール間に金属溶湯
を注湯してから定常状態に至るまでのロール回転速度を
制御することにより、凝固シエル厚を一定に保ち、鋳片
性状を向上する技術が開示されている。In order to solve these problems, for example, in a thin plate continuous casting method disclosed in JP-A-60-137562, a steady state is obtained after pouring a molten metal between two water-cooled rolls. There is disclosed a technique in which the solidified shell thickness is kept constant and the slab property is improved by controlling the roll rotation speed up to.
【０００６】また特開昭６１−３７３５４号公報のドラ
ム式薄板連続鋳造機における水冷ドラムにおいては、予
め水冷ドラムに熱変形に相当する鼓形形状を付与し、鋳
造中は水冷ドラムが直円筒状になることにより、肉厚の
均一な薄板を製造し、圧延製品の形状を安定させる技術
が開示されている。Further, in the water-cooling drum in the drum type thin plate continuous casting machine of Japanese Patent Laid-Open No. 61-37354, the water-cooling drum is previously provided with an hourglass shape corresponding to thermal deformation, and the water-cooling drum has a right cylindrical shape during casting. As a result, a technique for producing a thin plate having a uniform thickness and stabilizing the shape of a rolled product is disclosed.
【０００７】ところでこれら従来の技術は、ある程度鋳
造が定常化された状態では効果があるが、鋳造初期の段
階においては依然としてロール温度や凝固シェルの肉厚
が一定せず、形状のばらつき，また鋳片の割れやバルジ
ングを生じ、操業の不安定と鋳片の歩留り低下をきたし
ていた。By the way, these conventional techniques are effective in a state where casting is stabilized to some extent, but in the initial stage of casting, the roll temperature and the thickness of the solidified shell are still not constant, resulting in variations in shape and casting. Cracks and bulging of the slab occurred, causing unstable operation and reduced yield of the slab.
【０００８】本発明は上記課題に鑑みなされたもので、
鋳造初期の非定常鋳片の発生を防止し、操業の安定と歩
留り向上を図る薄板連続鋳造方法を提供する。The present invention has been made in view of the above problems.
(EN) Provided is a thin plate continuous casting method which prevents the occurrence of unsteady slabs in the initial stage of casting, stabilizes the operation, and improves the yield.
【０００９】[0009]
【課題を解決するための手段】本発明は、２個のロール
間に溶湯を注入して薄板鋳片を製造する双ロール式薄板
連続鋳造方法において、鋳造前に前記ロール表面を所定
の温度に予熱して鋳造を開始することを特徴とする双ロ
ール式薄板連続鋳造方法である。SUMMARY OF THE INVENTION The present invention is a twin roll type thin plate continuous casting method for producing a thin plate cast product by injecting a molten metal between two rolls, and the roll surface is heated to a predetermined temperature before casting. It is a twin roll type thin plate continuous casting method characterized by preheating and starting casting.
【００１０】[0010]
【作用】鋳造初期における非定常鋳片の発生は、鋳造初
期のロールの温度が低くかつ安定していないことに起因
することより、本発明は鋳造開始前に予めロールの温度
を所定温度に加熱し、鋳造中のロール熱膨張量，抜熱状
態と同じ状態として鋳造を行い、非定常鋳片の発生を極
力減少させるものである。The occurrence of unsteady slabs at the beginning of casting is due to the fact that the roll temperature at the beginning of casting is low and not stable. Therefore, the present invention preheats the roll temperature to a predetermined temperature before starting casting. Then, casting is performed in the same state as the roll thermal expansion amount and the heat removal state during casting to reduce the occurrence of unsteady cast pieces as much as possible.
【００１１】[0011]
【実施例】図１に本発明を実施するに好適な予熱用の加
熱ヒータを設けた薄板連続鋳造装置を示す。ロール１
は、厚さ約１０ｍｍの銅スリーブ６の表面に約１ｍｍ厚
のＮｉメッキ７が施され、内部は水冷されており、表面
から約７ｍｍ内部の銅スリーブ６中にロールの加熱温度
を管理する熱電対８が埋設されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a thin plate continuous casting apparatus provided with a heater for preheating suitable for carrying out the present invention. Roll 1
Is a copper sleeve 6 having a thickness of about 10 mm, the surface of which is plated with Ni having a thickness of about 1 mm, and the inside of which is water-cooled. Pair 8 is buried.
【００１２】加熱ヒータ５は、ロール１の反鋳造側の外
面に沿って約半周にわたり配設されており、ロール１を
予熱する場合はロールを均一に加熱する必要より、ロー
ルを一定速度にて回転しながら加熱する。The heater 5 is disposed along the outer surface of the roll 1 on the side opposite to the casting side for about half a circumference. When preheating the roll 1, it is necessary to heat the roll uniformly, so that the roll can be heated at a constant speed. Heat while rotating.
【００１３】また熱電対８にてロール表面温度を管理す
る場合、この両者の間には当然温度差があるので、熱電
対指示温度とロールの実際の表面温度との相関関係を事
前に求めておくとよい。When the roll surface temperature is controlled by the thermocouple 8, since there is a temperature difference between the two, naturally, the correlation between the thermocouple indicated temperature and the actual surface temperature of the roll is obtained in advance. It is good to put it.
【００１４】このロール予熱手段としては、加熱ヒータ
の他に燃料ガス等による加熱手段で行ってもよい。As the roll preheating means, a heating means such as a fuel gas may be used instead of the heating heater.
【００１５】図３は上記双ロールを使用して、ロール予
熱を行った場合と、ロール予熱を行わなかった場合の、
鋳造した鋳片の縦割れ長さとクラウン量を比較した図面
であり、この場合の鋳造条件は次の通りである。FIG. 3 shows the case where roll preheating is performed and the case where roll preheating is not performed using the above twin rolls.
It is the drawing which compared the vertical crack length of the cast slab and the amount of crown, and the casting conditions in this case are as follows.
【００１６】使用した双ロールは、ロール幅３５０ｍ
ｍ，鋳造した鋳片はＳＵＳ−３０４，鋳片厚３ｍｍであ
る。なおロールの表面温度は、熱電対で１８０℃を指示
した時に所定の約５００℃に達した。The twin roll used has a roll width of 350 m.
m, the cast slab is SUS-304, the slab thickness is 3 mm. The surface temperature of the roll reached a predetermined temperature of about 500 ° C when 180 ° C was indicated by the thermocouple.
【００１７】この試験結果から判るように、ロール予熱
を行わなかった場合は、ロールが定常の温度に達するの
に３０秒以上を要し、この間に鋳造される鋳片は縦割れ
が多く観察され、また鋳片クラウンも最大２００μｍと
なった。As can be seen from the test results, when the roll was not preheated, it took 30 seconds or more for the roll to reach a steady temperature, and many vertical cracks were observed in the slab cast during this period. The maximum slab crown was 200 μm.
【００１８】これに対してロール予熱を行った場合は、
鋳片クラウンも小さく、また鋳片縦割れは殆ど見られ
ず、鋳造開始初期より良好な表面性状の鋳片が得られ
た。On the other hand, when roll preheating is performed,
The slab crown was also small, vertical slab cracks were hardly seen, and a slab with good surface properties was obtained from the beginning of casting.
【００１９】本実施例は直径４００ｍｍφロールを使用
したが、より大径のロールを使用した場合は、さらに非
定常部が大きくなって鋳片の歩留りが低下することが推
定され、従って本発明を実施することにより、さらに歩
留り効果が向上することが期待できる。In this example, a roll having a diameter of 400 mm was used. However, when a roll having a larger diameter is used, it is estimated that the unsteady portion becomes larger and the yield of cast slabs is lowered. By carrying out the method, it can be expected that the yield effect will be further improved.
【００２０】[0020]
【発明の効果】以上説明した如く本発明によれば、鋳造
前に前記ロール表面を所定の温度に予熱することによ
り、鋳造初期に生ずる鋳片の厚さのばらつきや不均衡、
また鋳片割れの問題を解消し、鋳造欠陥のない表面性状
の優れた鋳片を得ることができ、鋳片の歩留りも向上し
て鋳片のコスト低減を図り得る。As described above, according to the present invention, by preheating the surface of the roll to a predetermined temperature before casting, variations or imbalances in the thickness of the slab that occur at the initial stage of casting,
Further, it is possible to solve the problem of slab cracking, obtain a slab with excellent surface properties without casting defects, improve the yield of the slab, and reduce the cost of the slab.
【図１】本発明を実施するに好適な双ロール式薄板連続
鋳造装置の概略を示す側面図である。FIG. 1 is a side view schematically showing a twin roll type thin plate continuous casting apparatus suitable for carrying out the present invention.
【図２】従来の双ロール式薄板連続鋳造装置の概略を示
す側面図である。FIG. 2 is a side view showing an outline of a conventional twin roll type thin plate continuous casting apparatus.
【図３】従来の方法と実施例の効果を比較した図面であ
る。FIG. 3 is a drawing comparing the effects of the conventional method and the embodiment.
１ 鋳造用のロール ２ 溶湯プール ３ 凝固シェル ４ 薄板鋳片 ５ 加熱ヒータ ６ 銅スリーブ ７ Ｎｉメッキ ８ 熱電対 1 Casting roll 2 Molten metal pool 3 Solidification shell 4 Thin plate slab 5 Heater 6 Copper sleeve 7 Ni plating 8 Thermocouple
Claims (1)
片を製造する双ロール式薄板連続鋳造方法において、鋳
造前に前記ロール表面を所定の温度に予熱して鋳造を開
始することを特徴とする双ロール式薄板連続鋳造方法。1. A twin-roll type thin plate continuous casting method for producing a thin plate slab by injecting a molten metal between two rolls, in which casting is started by preheating the roll surface to a predetermined temperature before casting. A twin roll type thin plate continuous casting method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8498692A JPH05245594A (en) | 1992-03-09 | 1992-03-09 | Twin roll type strip continuous casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8498692A JPH05245594A (en) | 1992-03-09 | 1992-03-09 | Twin roll type strip continuous casting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05245594A true JPH05245594A (en) | 1993-09-24 |
Family
ID=13845948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8498692A Withdrawn JPH05245594A (en) | 1992-03-09 | 1992-03-09 | Twin roll type strip continuous casting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05245594A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU664670B2 (en) * | 1993-05-27 | 1995-11-23 | Bhp Steel (Jla) Pty Limited | Casting metal strip |
| WO1999012677A1 (en) * | 1997-09-10 | 1999-03-18 | Danieli & C. Officine Meccaniche S.P.A. | Continuous casting device with rollers and casting method with rollers |
| EP1769863A2 (en) * | 2000-07-19 | 2007-04-04 | Mitsubishi Heavy Industries, Ltd. | Dual drum type continuous casting method for continuous casting |
| EP2357051A1 (en) * | 2010-01-15 | 2011-08-17 | Siemens Aktiengesellschaft | Method for operating a compound casting rolling assembly, compound casting rolling assembly and control and/or regulating device for a compound casting rolling assembly |
| KR20150009869A (en) * | 2013-07-17 | 2015-01-27 | 주식회사 포스코 | Twin roll strip caster |
-
1992
- 1992-03-09 JP JP8498692A patent/JPH05245594A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU664670B2 (en) * | 1993-05-27 | 1995-11-23 | Bhp Steel (Jla) Pty Limited | Casting metal strip |
| WO1999012677A1 (en) * | 1997-09-10 | 1999-03-18 | Danieli & C. Officine Meccaniche S.P.A. | Continuous casting device with rollers and casting method with rollers |
| EP1769863A2 (en) * | 2000-07-19 | 2007-04-04 | Mitsubishi Heavy Industries, Ltd. | Dual drum type continuous casting method for continuous casting |
| EP1769863A3 (en) * | 2000-07-19 | 2007-04-18 | Mitsubishi Heavy Industries, Ltd. | Dual drum type continuous casting method for continuous casting |
| EP2357051A1 (en) * | 2010-01-15 | 2011-08-17 | Siemens Aktiengesellschaft | Method for operating a compound casting rolling assembly, compound casting rolling assembly and control and/or regulating device for a compound casting rolling assembly |
| KR20150009869A (en) * | 2013-07-17 | 2015-01-27 | 주식회사 포스코 | Twin roll strip caster |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990518 |