JP3230461B2 - Method of supplying molten steel in mold of continuous casting machine - Google Patents
Method of supplying molten steel in mold of continuous casting machineInfo
- Publication number
- JP3230461B2 JP3230461B2 JP16722397A JP16722397A JP3230461B2 JP 3230461 B2 JP3230461 B2 JP 3230461B2 JP 16722397 A JP16722397 A JP 16722397A JP 16722397 A JP16722397 A JP 16722397A JP 3230461 B2 JP3230461 B2 JP 3230461B2
- Authority
- JP
- Japan
- Prior art keywords
- stopper
- molten steel
- mold
- pressure
- hot water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Continuous Casting (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明の方法は、連続鋳造機
の鋳型内へ溶鋼給湯量を調節するタンデイシュのストッ
パー駆動方法を制御する鋳型内への溶鋼給湯方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for feeding molten steel into a mold for controlling a method of driving a tundish stopper for adjusting the amount of molten steel supplied to the mold of a continuous casting machine.
【０００２】[0002]
【従来の技術】連続鋳造において鋳型内の溶鋼レベルを
安定化させることは、鋳型と溶鋼の表面に一定厚みのパ
ウダー（被覆剤）フィルムを均一に供給・形成し、均一
な凝固シェルを形成して表面疵の発生を防止するととも
に、溶鋼内へのスラグの巻き込みを減少させ、内部品質
の優れた鋳片を製造する上で重要な技術である。2. Description of the Related Art In continuous casting, stabilizing the molten steel level in a mold involves uniformly supplying and forming a powder (coating agent) film having a constant thickness on the surface of the mold and the molten steel, thereby forming a uniform solidified shell. This is an important technique for preventing the occurrence of surface flaws and reducing slag entrainment in molten steel, and producing cast slabs having excellent internal quality.
【０００３】鋳型内の溶鋼レベルを目標レベルに制御す
る従来方法としては、鋳型内の溶鋼レベルをレベル計に
よって検出し、目標レベルとの間に偏差があるときは、
検出値と目標値との偏差が０になるようにストッパーを
昇降して、タンディシュのノズルの溶鋼通過量を制御す
るストッパー方式（以下、「ＳＴ方式」という）による
ものと、タンディシュのノズルに設けたスライディング
ゲートを開閉して同じくノズルの溶鋼通過量を制御する
スライディングノズル方式（以下、「ＳＮ方式」とい
う）によるものとがある。[0003] As a conventional method of controlling the molten steel level in the mold to a target level, the molten steel level in the mold is detected by a level meter, and when there is a deviation from the target level,
A stopper system (hereinafter, referred to as an "ST system") that controls the amount of molten steel passing through a tundish nozzle by raising and lowering a stopper so that the deviation between the detected value and the target value becomes 0, and a tundish nozzle. There is a sliding nozzle system (hereinafter, referred to as an "SN system") in which a sliding gate is opened and closed to control the amount of molten steel passing through the nozzle.
【０００４】一般的にＳＴ方式はＳＮ方式に比べ、スト
ッパーによるノズル開度に対する溶鋼の給湯流量の変化
が大きく、すなわち流量ゲインが高いので、比較的給湯
流量を確保しなければならない定常給湯時には、優れた
制御性を発揮する。特に、高速鋳造時にその特徴が顕著
となる。また、ＳＮ方式で発生する、スライディングゲ
ート摺動面からの外気の吸引により溶鋼が酸化して鋳片
品質が悪化するという問題もない。In general, the ST system has a large change in molten steel supply flow rate with respect to the nozzle opening degree by the stopper, that is, a high flow rate gain, as compared with the SN system. Demonstrate excellent controllability. In particular, the feature becomes remarkable at the time of high-speed casting. Further, there is no problem that the molten steel is oxidized due to the suction of outside air from the sliding surface of the sliding gate and the cast slab quality is deteriorated.
【０００５】その反面、溶鋼の給湯開始時には、ストッ
パーの昇降調整の誤差等の影響により制御性が不安定と
なることがある。ここで、「開度」とはＳＴの昇降量お
よびスライディングゲートの開閉量を示している。On the other hand, at the start of hot water supply of molten steel, the controllability may be unstable due to the influence of errors in adjusting the elevation of the stopper. Here, the "opening degree" indicates the amount of elevation of the ST and the amount of opening and closing of the sliding gate.
【０００６】このようなＳＴ方式の制御性の不安定化を
考慮し、鋳造条件に応じてＳＴ方式とＳＮ方式を使い分
けて、鋳型内の溶鋼レベルを制御する溶鋼給湯方法が以
下のように提案されている。In consideration of the instability of the controllability of the ST system, a molten steel hot water supply method for controlling the molten steel level in a mold by selectively using the ST system and the SN system according to casting conditions has been proposed as follows. Have been.
【０００７】特開平６−１５４２６号公報および特開平
７−８８６０７号公報には、鋳型内の溶鋼レベルを制御
する方法として、鋳造条件に応じてＳＴ方式とＳＮ方式
の使い分けを行う方法が開示されている。Japanese Patent Application Laid-Open Nos. 6-15426 and 7-88607 disclose a method of controlling the molten steel level in a mold by selectively using the ST method and the SN method according to casting conditions. ing.
【０００８】しかしながら、この給湯方法ではＳＴ方式
とＳＮ方式を併用するため、メンテナンスおよびコスト
面でＳＴもしくはＳＮ単独方式より不利である。また、
前記の特開平６−１５４２６号公報および特開平７−８
８６０７号公報の方法では、ＳＮ方式を採用するため、
スライディングゲートの摺動面からの外気吸引による鋳
片品質悪化という問題点もある。However, in this hot water supply method, since the ST method and the SN method are used in combination, it is disadvantageous in terms of maintenance and cost as compared with the ST or SN only method. Also,
JP-A-6-15426 and JP-A-7-8
In the method of 8607, since the SN method is adopted,
There is also a problem that the quality of the slab is deteriorated due to the suction of outside air from the sliding surface of the sliding gate.
【０００９】ところで、従来のＳＴ方式による溶鋼流量
制御を実施する場合、連続鋳造開始に際してタンデッシ
ュの予熱を行うときに、耐火物であるストッパーも加熱
されるためストッパーに伸びが発生する。したがって、
タンデッシュの加熱前と加熱後では上ノズルとストッパ
ーの位置が変動し、ストッパーの全閉位置（以下「ゼロ
点」という）にズレが生じる。When the flow rate of molten steel is controlled by the conventional ST method, when the tundish is preheated at the start of continuous casting, the stopper, which is a refractory, is also heated, so that the stopper expands. Therefore,
Before and after the heating of the tundish, the positions of the upper nozzle and the stopper fluctuate, and a shift occurs in the fully closed position of the stopper (hereinafter referred to as “zero point”).
【００１０】通常、ＳＴ方式で用いられるステッピング
モータ付き駆動シリンダは、変位センサを持っていない
ため、鋳造スタート前にゼロ点をセットし直す必要があ
る。この時、耐火物であるストッパーが上ノズルを押し
付けるため、特にシリンダの押し付け力（油圧源の圧力
により決定される）が強い場合、ストッパーの撓みおよ
びストッパーと上ノズルの噛み込み具合の影響により、
ゼロ点に誤差が生じる。また、最悪の場合は、溶鋼の流
量特性を決定するストッパーおよび上ノズルの形状を損
傷する危険性がある。これらを総称してストッパー調整
時の誤差という。この影響は、オートスタート時の初期
開度の誤差となって現れるため、ＳＴ方式でのオートス
タート時の湯面制御の不安定を引き起こす要因となって
いる。スタート時の湯面制御不安定はレベル不足の時は
ブレイクアウト、レベルが高過ぎるとオーバーフローと
なり長時間の操業停止につながる。Normally, a drive cylinder with a stepping motor used in the ST system does not have a displacement sensor, so it is necessary to reset the zero point before starting casting. At this time, since the stopper, which is a refractory, presses the upper nozzle, especially when the pressing force of the cylinder (determined by the pressure of the hydraulic pressure source) is strong, due to the influence of the bending of the stopper and the engagement between the stopper and the upper nozzle,
An error occurs at the zero point. In the worst case, there is a risk of damaging the shapes of the stopper and the upper nozzle that determine the flow characteristics of the molten steel. These are collectively called errors during stopper adjustment. Since this influence appears as an error in the initial opening degree at the time of the automatic start, it is a factor that causes instability of the level control at the time of the automatic start in the ST method. Unstable level control at the start causes breakout when the level is insufficient, and overflows when the level is too high, leading to a long-time shutdown.
【００１１】図２は、ＳＴ方式で溶鋼流量の制御を行っ
た場合の溶鋼湯面レベルの制御状況を示すグラフであ
る。図２に示すように、鋳造開始時にストッパーの調整
誤差の影響があり、初期開度の供給量が目標流量値より
多く流出したため、制御が追従できなかった。そのた
め、鋳型内への給湯量と鋳型からの流出量（鋳造速度）
とがバランスするストッパー開度に安定するまでオーバ
ーシートを発生し、静止まで時間がかかっている。ここ
でいう「オーバーシュート」とは、図２の記号Ｘで示
す、制御不良により湯面レベルが安定しない状態をい
う。FIG. 2 is a graph showing the control state of the molten steel level when the molten steel flow rate is controlled by the ST method. As shown in FIG. 2, at the start of casting, there was an effect of the stopper adjustment error, and the supply amount of the initial opening flowed out more than the target flow rate value, so that the control could not follow. Therefore, the amount of hot water supplied into the mold and the amount of outflow from the mold (casting speed)
The overseat occurs until the stopper opening stabilizes and the balance is balanced, and it takes time to stop. The term “overshoot” as used herein refers to a state indicated by a symbol X in FIG. 2 where the level of the molten metal is not stable due to poor control.
【００１２】[0012]
【発明が解決しようとする課題】本発明は、上記従来技
術の問題点を解決すべくなされたものであり、ＳＴ方式
の欠点であるストッパー調整時の誤差をなくし、鋳造開
始から終了に至るまでの鋳造工程全般にわたり、溶鋼湯
面レベルを精度良く制御できる連続鋳造機の鋳型内給湯
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 of the prior art, and eliminates an error in adjusting a stopper, which is a drawback of the ST method, from the start to the end of casting. It is an object of the present invention to provide a method for hot water supply in a mold of a continuous casting machine, which can control the molten steel level in a continuous manner throughout the casting process.
【００１３】[0013]
【課題を解決するための手段】本発明者等は、タンデイ
シュに設置したストッパーによる流量制御を用いて、鋳
型内への溶鋼レベルを制御する種々の実験を行い検討し
た結果、下記の知見を得た。Means for Solving the Problems The present inventors have conducted various experiments for controlling the level of molten steel in a mold by using a flow rate control by a stopper installed in a tundish, and as a result, the following findings have been obtained. Was.
【００１４】(1) 溶鋼給湯前は、駆動用シリンダの油圧
を給湯時より低圧に切り替え、給湯時には元の油圧に戻
すことによりゼロ点をセット（以下、「ゼロセット」と
いう）したときの位置のズレが防げる。(1) Before hot water supply, the hydraulic pressure of the drive cylinder is switched to a lower pressure than when hot water is supplied, and when hot water is supplied, the hydraulic pressure is returned to the original oil pressure to set the zero point (hereinafter referred to as “zero set”). The gap can be prevented.
【００１５】（２）溶鋼給湯前のゼロセット時に、スト
ッパー先端を上ノズルに押しつける時は駆動用シリンダ
の推進力が、給湯時におけるシリンダの推進力よりも低
い目標の設定値を超えないように、駆動用シリンダのポ
ート内圧力を圧力センサにより計測し圧力制御すること
が有効である。ここで、「目標の設定値」とは、ストッ
パーおよびストッパーアームの撓み、ならびにストッパ
ー先端の欠損を防止するために、予め定めた「駆動用シ
リンダの推進力の目標の設定値」のことを意味する。 (2) The thrust of the driving cylinder is lower than the thrust of the cylinder at the time of hot water supply when pressing the tip of the stopper against the upper nozzle at the time of zero setting before hot water supply.
It is effective to measure the pressure in the port of the driving cylinder with a pressure sensor and control the pressure so as not to exceed the target set value. Here, the “target value” refers to the storage
Par and stopper arm deflection and stopper
-To prevent the tip from losing,
Set value of Linda's propulsion target. "
【００１６】本発明は、このような知見に基づきなされ
たもので、その要旨は下記（Ａ）および（Ｂ）の通りで
ある。The present invention has been made based on such findings, and the gist is as follows (A) and (B).
【００１７】（Ａ）タンデイシュに設置したストッパー
の昇降位置の制御により、鋳型内への溶鋼の給湯流量を
制御する方法において、給湯開始前のストッパーのゼロ
セットの際に、ストッパーの先端を上ノズルに押し付け
ているストッパー駆動用シリンダの油圧を給湯時より低
圧に切り替え、ストッパーのゼロセット後は給湯時と同
じ油圧に戻すことを特徴とする連続鋳造機の鋳型内溶鋼
給湯方法。(A) In a method of controlling the flow rate of molten steel in a mold by controlling the position of a stopper installed on a tundish, the tip of the stopper is set to an upper nozzle when the stopper is set to zero before starting hot water supply. A method for supplying molten steel in a mold of a continuous casting machine, characterized in that the hydraulic pressure of a stopper driving cylinder pressed against the hot water is switched to a lower pressure than at the time of hot water supply, and after the stopper is set to zero, the hydraulic pressure returns to the same as at the time of hot water supply.
【００１８】（Ｂ）タンデイシュに設置したストッパー
の昇降位置の制御により、鋳型内への溶鋼の給湯流量を
制御する方法において、ストッパー駆動用シリンダのポ
ート内圧力を圧力センサにより計測し、給湯開始前のス
トッパーのゼロセットの際に、ストッパー先端を上ノズ
ルに押し付けるシリンダの推進力が、給湯時におけるシ
リンダの推進力よりも低い目標の設定値を越えないよう
にすることを特徴とする連続鋳造機の鋳型内溶鋼給湯方
法。(B) In the method of controlling the flow rate of molten steel supply into the mold by controlling the elevation position of the stopper installed on the tundish, the pressure in the port of the cylinder for driving the stopper is measured by a pressure sensor, and before the start of hot water supply. sheet of the time of the zero set of the stopper, driving force of the cylinder pressing the stopper tip on the nozzle, at the time of hot water
A method for feeding molten steel in a mold of a continuous casting machine, wherein a target set value lower than a propulsive force of a Linda is not exceeded.
【００１９】[0019]
【発明の実施の形態】本発明の鋳型内溶鋼給湯方法につ
いて図面に基づいて以下に説明する。図１は、本発明の
第１の方法を実施するのに用いる装置の模式図である。
図１に示すように、給湯量を調整するストッパー１は、
ストッパーアーム２とロッド３を介してストッパー駆動
用シリンダ４により駆動され、その昇降位置が制御され
る。ストッパー１の先端は、上ノズル９に対向して位置
しており、その昇降によってストッパーの開閉が調節さ
れる。駆動用シリンダ４はステッピングモーター５によ
り駆動される案内弁により、位置決めができる構造をも
っている。この時の駆動用シリンダの最大推進力はポン
プライン６（以下、Ｐラインという）の油圧力により決
定する。タンクライン７（以下、Ｔラインという）は油
の戻りラインである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for supplying molten steel in a mold according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of an apparatus used to carry out the first method of the present invention.
As shown in FIG. 1, a stopper 1 for adjusting the amount of hot water
The cylinder is driven by a stopper driving cylinder 4 via a stopper arm 2 and a rod 3, and its elevation position is controlled. The tip of the stopper 1 is located to face the upper nozzle 9, and the opening and closing of the stopper is adjusted by moving up and down. The driving cylinder 4 has a structure that can be positioned by a guide valve driven by a stepping motor 5. The maximum driving force of the driving cylinder at this time is determined by the hydraulic pressure of the pump line 6 (hereinafter, referred to as P line). The tank line 7 (hereinafter, referred to as a T line) is an oil return line.
【００２０】図１に示すように、ストッパー駆動用シリ
ンダ４へのＰライン６の油圧は圧力切り替え弁１０によ
り低圧または高圧に切り替えることができるようになっ
ている。As shown in FIG. 1, the hydraulic pressure of the P line 6 to the stopper driving cylinder 4 can be switched between low pressure and high pressure by a pressure switching valve 10.
【００２１】給湯前のストッパーのゼロセット時は、低
圧でシリンダを駆動させることによりストッパー１の上
ノズル９への押し付け力を軽減し、ストッパー１および
アーム２の撓みおよびストッパー１の先端の欠損を防止
することにより、ゼロセット時の誤差を最小限にする。
ストッパーのゼロセット後は、Ｐライン６の圧力を高圧
に切り替えることにより、制御時の駆動用シリンダの応
答を損なわないようにする。When the stopper is set to zero before hot water supply, the cylinder is driven at a low pressure to reduce the pressing force of the stopper 1 against the upper nozzle 9, and the deflection of the stopper 1 and the arm 2 and the loss of the tip of the stopper 1 are reduced. Prevention minimizes errors during zero set.
After the stopper is set to zero, the pressure of the P line 6 is switched to a high pressure so that the response of the driving cylinder during control is not impaired.
【００２２】図３は、本発明の第２の方法を実施するの
に用いる駆動用シリンダの推進力が設定値を超えないよ
うに制御する装置の構成図である。図３に示すように、
鋳型内へ溶鋼を供給するに先立つゼロセット時は、切替
スイッチ１２をゼロセット側に切替える。この選択状態
でコントローラ１３には、圧力センサ１１により検出さ
れる駆動用シリンダ４のポート内圧力が設定圧力を越え
た場合、ステッピングモータ５への移動指令を０（零）
とするようなシーケンスが組込まれている。このシーケ
ンス制御によって駆動用シリンダ４の推進力が設定値を
超えないようにして、ストッパーおよびアームの撓みを
防止し、ストッパー先端の欠損を防止することによりゼ
ロセット時の誤差を最小限にする。FIG. 3 is a block diagram of a device for controlling the driving force of the driving cylinder so as not to exceed a set value, which is used to carry out the second method of the present invention. As shown in FIG.
At the time of zero set before supplying molten steel into the mold, the changeover switch 12 is switched to the zero set side. In this selected state, when the pressure in the port of the driving cylinder 4 detected by the pressure sensor 11 exceeds the set pressure, the controller 13 issues a movement command to the stepping motor 5 to 0 (zero).
The following sequence is incorporated. By this sequence control, the thrust of the driving cylinder 4 does not exceed the set value, the deflection of the stopper and the arm is prevented, and the tip of the stopper is prevented from being lost, thereby minimizing the error at the time of zero set.
【００２３】ストッパーのゼロセット後は、切替えスイ
ッチを通常側に切替える。この選択状態では、圧力セン
サー１１による制御は行わず、ストッパー昇降の指令は
そのままステッピングモータ５に与えられる。Ｐライン
６の油圧で駆動するためステッピングシリンダ４の応答
は損なわれない。After the stopper is set to zero, the changeover switch is switched to the normal side. In this selected state, the control by the pressure sensor 11 is not performed, and the command for raising and lowering the stopper is given to the stepping motor 5 as it is. The response of the stepping cylinder 4 is not impaired because it is driven by the hydraulic pressure of the P line 6.
【００２４】[0024]
【実施例】本発明方法の効果を具体的な実施例に基づい
て以下に説明する。鋳型内へ溶鋼を給湯する前にストッ
パー駆動用シリンダの高圧側油圧力を通常操業時に確認
している１４０kgf ／cm2 に設定した。EXAMPLES The effects of the method of the present invention will be described below based on specific examples. Before the molten steel was fed into the mold, the high pressure side hydraulic pressure of the cylinder for driving the stopper was set to 140 kgf / cm 2 which was confirmed during normal operation.
【００２５】次に、低圧側の給湯前のストッパーゼロセ
ット時の油圧力を決定するために、シリンダ油圧とスト
ッパー先端にかかる力をロードセルにより計測した。そ
の結果を図４に示す。図４は、ストッパー先端にかかる
力とシリンダ油圧との関係を示すグラフである。ストッ
パー先端にかかる力が１０００kgf を超えると、ストッ
パー先端が欠損する危険性が大きくなることが知られて
いるので油圧力をこの値以下にする必要がある。 一
方、ストッパーを押し上げるのに必要な油圧力を計算よ
り求めると、（３５０×１. ２）／｛（５０／２）2 ×
π）−（３５. ５／ ２）2 ×π）｝＝４３. １３kgf
／cm2 となる。Next, in order to determine the hydraulic pressure at the time of setting the stopper zero before hot water supply on the low pressure side, the cylinder oil pressure and the force applied to the tip of the stopper were measured by a load cell. FIG. 4 shows the results. FIG. 4 is a graph showing the relationship between the force applied to the tip of the stopper and the cylinder oil pressure. It is known that if the force applied to the tip of the stopper exceeds 1000 kgf, the risk of breakage of the tip of the stopper increases, so it is necessary to reduce the hydraulic pressure to this value or less. On the other hand, when the hydraulic pressure required to push up the stopper is obtained by calculation, it is calculated as (350 × 1.2) / ｛(50/2) 2 ×
π) − (35.5 / 2) 2 × π)｝ = 43.13 kgf
/ Cm 2 .
【００２６】ただし、 ストッパー＋ストッパーアーム自重：３５０kg シリンダ径・ヘッド側：φ５０ｍｍ シリンダ径・ロッド側：φ３５. ５ｍｍ 安全係数：１. ２倍 以上の結果より、低圧側の油圧力を４５kgf/cm2 に設定
した。However, the stopper + stopper arm own weight: 350 kg Cylinder diameter, head side: φ50 mm Cylinder diameter, rod side: φ35.5 mm Safety factor: 1.2 times From the results above, the oil pressure on the low pressure side was 45 kgf / cm 2. Set to.
【００２７】次に８０トン転炉で精錬した炭素鋼を鋳型
断面寸法が９０ｍｍ厚さ×１０００ｍｍ幅の連続鋳造機
で鋳込み操業を行い、以下の評価を行った。評価方法と
しては、オートスタート時の鋳型内湯面レベル制御性の
良否を判定するため、ストッパーの初期開度の誤差によ
って発生する(1) 初期給湯流量不足および流量過剰によ
るオペレータの手動介入、(2) オペレータ介入はなかっ
たものの流量過剰による初期湯面オーバーシュート（≧
１０ｍｍ）の発生率（以下、オートスタート時の制御不
良発生率という）を本発明方法の２つの方式と従来法の
３つで比較検討した。図５に、オートスタート時の制御
不良の発生率をグラフで示す。Next, the carbon steel refined in the 80-ton converter was cast in a continuous casting machine having a mold cross-sectional dimension of 90 mm thick × 1000 mm wide, and the following evaluation was performed. As an evaluation method, in order to judge the quality of the mold level control in the mold at the time of the automatic start, it is caused by an error in the initial opening of the stopper. (1) Manual intervention of an operator due to insufficient initial hot water supply flow rate and excessive flow rate, (2) ) Although there was no operator intervention, the initial level overshoot due to excess flow (≧
10 mm) (hereinafter referred to as “control failure occurrence rate at the time of auto-start”) was compared and examined by two methods of the present invention and three methods of the related art. FIG. 5 is a graph showing the occurrence rate of control failure at the time of the automatic start.
【００２８】（実施例１）電気油圧ステッピングシリン
ダ４のポンプライン６の圧力切替弁１０の低圧側の圧力
設定を４５kgf/cm2 に、高圧側の圧力設定を１４０kgf/
cm2 にし、ストッパーのゼロセット時は低圧に、ゼロセ
ット完了後は高圧に切替かわるように回路を組んだ。(Embodiment 1) The pressure setting of the low pressure side of the pressure switching valve 10 of the pump line 6 of the electrohydraulic stepping cylinder 4 is set to 45 kgf / cm 2 , and the pressure setting of the high pressure side is set to 140 kgf / cm 2.
The pressure was set to cm 2 , and a circuit was set up so that the pressure was switched to low pressure when the stopper was set to zero and to high pressure after completion of the zero set.
【００２９】これにより、ゼロセット時のストッパー押
し付け力は従来の１４０kgf ／cm2時 の１７００kgf /
cm2の約１／２の８８０kgf/cm2 となり、ストッパー調
整時の誤 差が軽減されるとともに、ストッパー先端の
欠損も防げた。As a result, the stopper pressing force at the time of zero set is 1700 kgf / cm 2 at 140 kgf / cm 2 of the related art.
about 1/2 of 880kgf / cm 2 next cm 2, together with the error of the time stopper adjustment is reduced, it has prevented even loss of the stopper tip.
【００３０】（実施例２）次にストッパーのゼロセット
時は、計測しているシリンダポート内の圧力が４５kgf
／cm2 になった時点でストッパーの上ノズルへの押し付
けを停止するような シーケンスを組み込んだ。(Embodiment 2) Next, when the stopper is set to zero, the pressure in the cylinder port being measured is 45 kgf.
A sequence was incorporated to stop pressing the stopper against the upper nozzle when the pressure reached / cm 2 .
【００３１】これにより、ストッパーゼロセット実施時
のストッパー押し付け力は８８０kgf/cm2 となり、スト
ッパー調整時の誤差が軽減されたとともに、ストッパー
先端の欠陥も防止でき、オートスタートから鋳造終了ま
で鋳型内溶鋼レベルの安定化が実現できた。As a result, the stopper pressing force at the time of performing the stopper zero set is 880 kgf / cm 2 , the error at the time of the stopper adjustment is reduced, the defect at the tip of the stopper can be prevented, and the molten steel in the mold from the auto start to the end of casting can be prevented. Level stabilization was achieved.
【００３２】（実施例３）駆動用シリンダ４のポンプ圧
力を従来の１４０kgf/cm2 のままでゼロセットを実施し
た。このときの、ストッパー押し付け圧力は１７００kg
f/cm2 であり、ストッパー先端欠損の可能性が高く、オ
ートスタート実施時に湯面レベルのオーバーシュートが
発生した。(Embodiment 3) Zero set was carried out while the pump pressure of the driving cylinder 4 was kept at 140 kgf / cm 2 of the prior art. At this time, the stopper pressing pressure is 1700kg
f / cm 2 , there was a high possibility that the tip of the stopper was missing, and an overshoot of the molten metal level occurred during auto start.
【００３３】図５より、本発明例１，２ではオートスタ
ト時の制御不良発生率は３．０％であった。これに対
し、比較例（従来のＳＴ方式）のオートスタート時の制
御不良発生率は３０％であった。As shown in FIG. 5, in Examples 1 and 2 of the present invention, the control failure occurrence rate at the time of the automatic start was 3.0%. On the other hand, the control failure occurrence rate at the time of the automatic start of the comparative example (conventional ST method) was 30%.
【００３４】したがって、本発明方法を用いることによ
り、オートスタート時の制御不良発生率は、比較例（従
来のＳＴ方式）の１／１０まで減少し著しく向上した。
なお、鋳込み終了後、ストッパー先端部の欠損状況を目
視で観察したが、異常は認められなかった。Therefore, by using the method of the present invention, the control failure occurrence rate at the time of the automatic start was reduced to 1/10 of that of the comparative example (conventional ST system), and was significantly improved.
After completion of the casting, the state of the defect at the tip of the stopper was visually observed, but no abnormality was found.
【００３５】[0035]
【発明の効果】本発明方法により、従来のＳＴ方式の難
点である鋳造開始時の湯面変動が抑制でき、ブレークア
ウトおよびオーバーフロー等を防止できるので、操業の
安定性が大幅に向上する。According to the method of the present invention, the fluctuation of the molten metal level at the start of casting, which is a drawback of the conventional ST method, can be suppressed, and breakout and overflow can be prevented, so that the operation stability can be greatly improved.
【図１】本発明の方法を実施するのに用いる装置の模式
図である。FIG. 1 is a schematic view of an apparatus used to carry out the method of the present invention.
【図２】従来の方式で、溶鋼流量の制御を行った場合の
溶鋼湯面レベルの制御状況を示すグラフである。FIG. 2 is a graph showing a control state of a molten steel level when a molten steel flow rate is controlled by a conventional method.
【図３】ストッパー駆動用シリンダーの推進力を制御す
る装置の構成図である。FIG. 3 is a configuration diagram of an apparatus for controlling a propulsion force of a stopper driving cylinder.
【図４】ストッパー先端にかかる力とシリンダ油圧との
関係を示すグラフである。FIG. 4 is a graph showing a relationship between a force applied to a tip end of a stopper and a cylinder oil pressure.
【図５】オートスタート時の制御不良の発生率を示すグ
ラフである。FIG. 5 is a graph showing an occurrence rate of a control failure at the time of an automatic start.
１：ストッパー、 ２：ストッパーアーム、 ３：ロッド、 ４：ストッパー駆動用シリンダ、 ５：ステッピングモータ、 ６：ポンプライン（Ｐライン）、 ７：タンクライン（Ｔライン）、 ８：タンデイシュ、 ９：上ノズル、 １０：圧力切替弁 １１：圧力センサ、 １２：切替スイッチ、 １３：コントローラ、 Ｘ点：オーバーシュート。 1: Stopper, 2: Stopper arm, 3: Rod, 4: Stopper driving cylinder, 5: Stepping motor, 6: Pump line (P line), 7: Tank line (T line), 8: Tundish, 9: Upper Nozzle, 10: Pressure switching valve 11: Pressure sensor, 12: Changeover switch, 13: Controller, X point: Overshoot.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 村上 敏彦 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 (56)参考文献 実開 昭63−138948（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) B22D 11/18 B22D 11/10 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshihiko Murakami 4-33, Kitahama, Chuo-ku, Osaka-shi Inside Sumitomo Metal Industries, Ltd. (56) References Real Opening Sho-63-138948 (JP, U) (58) Field surveyed (Int.Cl. 7 , DB name) B22D 11/18 B22D 11/10
Claims (2)
位置の制御により、鋳型内への溶鋼の給湯流量を制御す
る方法において、給湯開始前のストッパーのゼロセット
の際に、ストッパーの先端を上ノズルに押し付けている
ストッパー駆動用シリンダの油圧を給湯時より低圧に切
り替え、ストッパーのゼロセット後は給湯時と同じ油圧
に戻すことを特徴とする連続鋳造機の鋳型内溶鋼給湯方
法。In a method for controlling the flow rate of molten steel into a mold by controlling the position of a stopper installed in a tundish, the tip of the stopper is set to an upper nozzle when the stopper is set to zero before the start of hot water supply. A method for supplying molten steel in a mold of a continuous casting machine, wherein the hydraulic pressure of a stopper driving cylinder that is being pressed is switched to a lower pressure than at the time of hot water supply, and after the stopper is set to zero, the hydraulic pressure is returned to the same as at the time of hot water supply.
位置の制御により、鋳型内への溶鋼の給湯流量を制御す
る方法において、ストッパー駆動用シリンダのポート内
圧力を圧力センサにより計測し、給湯開始前のストッパ
ーのゼロセットの際に、ストッパー先端を上ノズルに押
し付けるシリンダの推進力が、給湯時におけるシリンダ
の推進力よりも低い目標の設定値を越えないようにする
ことを特徴とする連続鋳造機の鋳型内溶鋼給湯方法。2. A method for controlling a flow rate of molten steel supplied to a mold by controlling a raising / lowering position of a stopper installed on a tundish, wherein a pressure in a port of a stopper driving cylinder is measured by a pressure sensor, and the pressure is measured before starting hot water supply. during zero set of the stopper, driving force of the cylinder pressing the stopper tip on the nozzle, the cylinder during the hot water supply
A method for supplying molten steel in a mold of a continuous casting machine, wherein a target set value lower than a propulsive force of the steel is not exceeded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16722397A JP3230461B2 (en) | 1997-06-24 | 1997-06-24 | Method of supplying molten steel in mold of continuous casting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16722397A JP3230461B2 (en) | 1997-06-24 | 1997-06-24 | Method of supplying molten steel in mold of continuous casting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1110300A JPH1110300A (en) | 1999-01-19 |
| JP3230461B2 true JP3230461B2 (en) | 2001-11-19 |
Family
ID=15845735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16722397A Expired - Fee Related JP3230461B2 (en) | 1997-06-24 | 1997-06-24 | Method of supplying molten steel in mold of continuous casting machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3230461B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102078959B (en) * | 2010-12-17 | 2012-08-15 | 中南大学 | Method for preventing overflow generated in artificial lead and calcium alloy pouring process and device thereof |
-
1997
- 1997-06-24 JP JP16722397A patent/JP3230461B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1110300A (en) | 1999-01-19 |
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