JPH09308948A - Method for controlling free loop in metallic strip continuous casting - Google Patents
Method for controlling free loop in metallic strip continuous castingInfo
- Publication number
- JPH09308948A JPH09308948A JP12481696A JP12481696A JPH09308948A JP H09308948 A JPH09308948 A JP H09308948A JP 12481696 A JP12481696 A JP 12481696A JP 12481696 A JP12481696 A JP 12481696A JP H09308948 A JPH09308948 A JP H09308948A
- Authority
- JP
- Japan
- Prior art keywords
- strip
- continuous casting
- metal strip
- loop
- drum
- 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- Withdrawn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
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- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、金属溶湯を回転す
る冷却ドラムの周面に連続して供給し凝固させながら金
属帯板とし、続いて金属帯板をフリーループ形成のもと
で帯板搬送装置により搬送する連続鋳造において、金属
帯板のループ位置を制御する方法及び装置に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal strip plate which is produced by continuously supplying molten metal to the peripheral surface of a rotating cooling drum and solidifying the molten metal strip. The present invention relates to a method and device for controlling the loop position of a metal strip in continuous casting carried by a carrying device.
【０００２】[0002]
【従来の技術】金属帯板を連続鋳造により製造する装置
としての双ドラム式連続鋳造装置は、図１に示すように
互いに反対向きに回転駆動する一対の冷却ドラム１，２
と、冷却ドラム１，２の両端面に押圧された一対のサイ
ド堰３，３（手前側を省略）とで形成された湯溜まり部
４にタンディッシュ５内の金属溶湯を注湯ノズル６によ
り連続して供給し冷却ドラムの周面で凝固シェルを形成
させながら、凝固シェルを一対の冷却ドラムの間隙で圧
着して金属帯板Ｓとする。金属帯板Ｓはピンチロール等
の帯板搬送装置７により巻取機等（図示しない）に送ら
れる。2. Description of the Related Art A twin-drum type continuous casting apparatus as an apparatus for producing a metal strip by continuous casting comprises a pair of cooling drums 1 and 2 which are rotationally driven in opposite directions as shown in FIG.
And a pair of side weirs 3 and 3 (the front side is omitted) pressed against both end surfaces of the cooling drums 1 and 2 into a molten metal pool 4 in which the molten metal in the tundish 5 is poured by a pouring nozzle 6. While being continuously supplied to form a solidified shell on the peripheral surface of the cooling drum, the solidified shell is pressure-bonded in the gap between the pair of cooling drums to form the metal strip S. The metal strip S is sent to a winder or the like (not shown) by a strip transport device 7 such as a pinch roll.
【０００３】このような連続鋳造において、冷却ドラム
から送り出された直後の金属帯板は、高温状態のため強
度が小さく破断し易い。そのため、この部分の金属帯板
はフリーループを形成した状態とすることにより張力を
可能な限り低く抑える方法が、例えば特開昭６３−４９
３５０号公報により知られている。この場合、図１に示
すように金属帯板Ｓのループ位置を検出するループ位置
検出器８を設け、検出信号によりループ位置が一定範囲
となるように帯板搬送装置７の搬送速度を制御してい
る。In such continuous casting, the metal strip immediately after being sent out from the cooling drum has a low strength because it is in a high temperature state and is easily broken. Therefore, a method of keeping the tension as low as possible by forming a free loop in the metal strip plate in this portion is disclosed in, for example, JP-A-63-49.
It is known from publication 350. In this case, a loop position detector 8 for detecting the loop position of the metal strip S is provided as shown in FIG. 1, and the transport speed of the strip transport device 7 is controlled by the detection signal so that the loop position falls within a certain range. ing.
【０００４】[0004]
【発明が解決しようとする課題】ところが、図１に示す
ように金属帯板Ｓをフリーループを形成した状態で送り
出した場合は、鋳造を開始した後、比較的早い時期にお
いて金属帯板Ｓが破線のように一方の冷却ドラムに付着
する場合がある。この場合、冷却ドラム１，２と帯板搬
送装置７との間における金属帯板Ｓの長さは変化してい
ないにも係わらず、ループ位置検出器８は金属帯板Ｓが
一点鎖線の位置にあるものと検出するため、すなわちル
ープ量が小さいものと検出するため帯板搬送装置７の搬
送速度を遅くすることになる。その結果、ループ量は益
々過大となって金属帯板Ｓがドラム直下で過大に蓄積
し、場合によっては搬送不能に至る場合がある。However, as shown in FIG. 1, when the metal strip S is sent out in the state of forming the free loop, the metal strip S is relatively early after casting is started. It may adhere to one of the cooling drums as indicated by the broken line. In this case, although the length of the metal strip S between the cooling drums 1 and 2 and the strip transport device 7 has not changed, the loop position detector 8 detects that the metal strip S is at the position of the chain line. Therefore, the conveyance speed of the strip conveying device 7 is slowed down in order to detect that there is a small amount of loop. As a result, the loop amount becomes more and more excessively large, and the metal strip S is excessively accumulated immediately below the drum, and in some cases, it may become impossible to convey.
【０００５】金属帯板の冷却ドラムへの付着が鋳造を開
始した後、比較的早い時期から発生する原因は以下のよ
うに考えられる。すなわち、サイド堰は一部が冷却ドラ
ム端面と接触して冷却され、他の部分は金属溶湯と接触
して加熱されるため、偏熱により熱変形する。さらに、
鋳造を開始した直後では凝固シェル厚みが変動するた
め、これに伴ってドラムギャップが変動する。そのた
め、サイド堰と冷却ドラム端面との擦り合わせが十分に
できないため、この間で間隙が生じる。この間隙から金
属溶湯が洩れ出して金属帯板の端部にバリが発生し、こ
のバリが冷却ドラムに付着するものと考えられる。The reason why the adhesion of the metal strip to the cooling drum occurs at a relatively early stage after the start of casting is considered as follows. That is, a part of the side weir is cooled by being brought into contact with the end surface of the cooling drum, and the other part is brought into contact with the molten metal to be heated, so that the side weir is thermally deformed due to uneven heat. further,
Immediately after the start of casting, the thickness of the solidified shell changes, so that the drum gap changes accordingly. Therefore, the side weir and the end surface of the cooling drum cannot be sufficiently rubbed with each other, and a gap is generated between them. It is considered that the molten metal leaks out from this gap to generate burrs at the end of the metal strip, and the burrs adhere to the cooling drum.
【０００６】冷却ドラムに付着した金属帯板は自重によ
り剥がれるため、付いたり離れたりした状態となる。そ
の結果、冷却ドラム直下の高温状態の金属帯板に張力変
動が加わって板破断の危険性が高まる。また場合によっ
ては金属帯板が冷却ドラム直下で過大に蓄積して搬送不
能になったり、さらには金属帯板が冷却ドラムに巻き付
いてしまって鋳造不能となる場合がある。溶湯洩れを防
止するために、サイド堰を３点支持により冷却ドラム端
面に均一に押付けたり、鋳造初期においてサイド堰の押
付力を強めたりしたが、溶湯洩れを完全に防止できなか
った。Since the metal strip attached to the cooling drum is peeled off by its own weight, it is attached or detached. As a result, tension fluctuations are applied to the metal strip in the high temperature state immediately below the cooling drum, and the risk of plate fracture increases. Further, in some cases, the metal strip may be excessively accumulated just below the cooling drum to be untransportable, or the metal strip may be wound around the cooling drum to make casting impossible. In order to prevent the leakage of the molten metal, the side dam was pressed against the end surface of the cooling drum uniformly by three-point support, and the pressing force of the side dam was strengthened in the initial stage of casting, but the leakage of the molten metal could not be completely prevented.
【０００７】そこで、本発明は連続鋳造によりフリール
ープを形成しながら送り出された金属帯板の冷却ドラム
への付着による搬送トラブルが発生しないように金属帯
板のループ位置を制御することを目的とする。Therefore, an object of the present invention is to control the loop position of the metal strip so that the transport trouble caused by the adhesion of the metal strip sent out while forming a free loop by continuous casting to the cooling drum does not occur. To do.
【０００８】[0008]
【課題を解決するための手段】前記のように、金属帯板
の連続鋳造において金属帯板をフリーループを形成した
状態で送り出した場合は、鋳造を開始した後、比較的早
い時期において金属帯板が冷却ドラムに付着してループ
量が過大となる。このとき、位置検出器はループ量が小
さいものと検出するため、従来のように位置検出器の検
出信号に応じて帯板搬送装置の搬送速度を制御するとル
ープ量は益々過大となる。As described above, in the continuous casting of metal strips, when the metal strips are sent in the state of forming a free loop, the metal strips are relatively early after the casting is started. The plate adheres to the cooling drum and the loop amount becomes excessive. At this time, the position detector detects that the loop amount is small. Therefore, if the conveying speed of the strip conveying device is controlled according to the detection signal of the position detector as in the conventional case, the loop amount becomes excessively large.
【０００９】そこで本発明は、金属帯板が冷却ドラムに
付着する連続鋳造の初期においては、位置検出器の検出
信号に応じた帯板搬送装置の制御は行わないで、冷却ド
ラムと帯板搬送装置の間における金属帯板のループ量を
ほぼ一定に維持する。そのためには、冷却ドラムの周速
度と帯板搬送装置の搬送速度を調整するが、この間にお
ける金属帯板は収縮するため、収縮量を補償する。金属
帯板の収縮量は、冷却ドラムと帯板搬送装置との距離、
鋳造厚み（鋳造速度）、鋼種等により僅かに異なるが、
冷却ドラムと帯板搬送装置との間における金属帯板の収
縮を補償するための補正係数は、０．９６〜１．００の
範囲で十分である。Therefore, according to the present invention, in the initial stage of continuous casting in which the metal strip adheres to the cooling drum, the control of the strip conveying device according to the detection signal of the position detector is not performed, and the cooling drum and the strip conveying are performed. Keep the amount of looping of the metal strip between the devices approximately constant. For that purpose, the peripheral speed of the cooling drum and the transport speed of the strip transport device are adjusted, but the shrinkage amount is compensated for because the metal strip shrinks during this period. The amount of shrinkage of the metal strip is determined by the distance between the cooling drum and the strip transport device,
Slightly different depending on casting thickness (casting speed), steel type, etc.,
The correction coefficient for compensating the contraction of the metal strip between the cooling drum and the strip transporting device is sufficient in the range of 0.96 to 1.00.
【００１０】したがって、帯板搬送装置の搬送速度を冷
却ドラムの周速度の０．９７〜１．００倍の範囲とする
と、冷却ドラムと帯板搬送装置との間の金属帯板は、ほ
ぼ一定量のループを形成した状態で搬送される。この場
合、帯板搬送装置はループ位置の変動や金属帯板の冷却
ドラムへの付着の有無に関係なく一定速度で駆動するた
め、前記ループ位置の誤検知によるループ量過大化の問
題は発生しない。Therefore, when the transport speed of the strip transport device is set to 0.97 to 1.00 times the peripheral velocity of the cooling drum, the metal strip between the cooling drum and the strip transport device is substantially constant. It is conveyed in the form of a loop of quantity. In this case, since the strip conveying device is driven at a constant speed regardless of the variation of the loop position and the presence or absence of the metal strip adhered to the cooling drum, the problem of excessive loop amount due to the false detection of the loop position does not occur. .
【００１１】図２は、図１に示した双ドラム式連続鋳造
装置を使用した金属帯板の連続鋳造において、鋳造開始
からの時間と金属帯板の冷却ドラムへの付着発生頻度の
関係を示している。図において、金属帯板の冷却ドラム
への付着は、その殆どが鋳造開始直後から発生してい
る。したがって、帯板搬送装置の搬送速度を冷却ドラム
の周速度の０．９７〜１．００倍の範囲とする開始時期
は、鋳造開始直後である。FIG. 2 shows the relationship between the time from the start of casting and the frequency of adhesion of the metal strip to the cooling drum in the continuous casting of the metal strip using the twin-drum type continuous casting apparatus shown in FIG. ing. In the figure, most of the adhesion of the metal strip to the cooling drum occurs immediately after the start of casting. Therefore, the start timing for setting the transport speed of the strip transport device within the range of 0.97 to 1.00 times the peripheral speed of the cooling drum is immediately after the start of casting.
【００１２】連続鋳造の初期においては、前記のように
サイド堰の熱変形に加えてドラムギャップの変動によ
り、冷却ドラム端面と接触するサイド堰の耐火物の部位
は変動するため摩耗が進行し難い。しかし、鋳造の経過
に伴って凝固シェル厚みの変動は小さくなるため、ドラ
ムギャップの目標値と実績値との偏差も小さくなり、ド
ラムギャップは静定する。その結果、サイド堰の冷却ド
ラム端面と接触する耐火物は摩耗が進行して、シール状
態が良好になる。At the initial stage of continuous casting, the refractory portion of the side dam contacting the end surface of the cooling drum fluctuates due to the thermal deformation of the side dam and the fluctuation of the drum gap as described above, so that the wear is unlikely to proceed. . However, since the variation of the solidified shell thickness decreases with the progress of casting, the deviation between the target value and the actual value of the drum gap also decreases, and the drum gap is settled. As a result, the refractory that contacts the end surface of the cooling drum of the side dam is worn away, and the sealed state is improved.
【００１３】図３は、図２に示したものと同一のデータ
を用いて、ドラムギャップの目標値と実績値との偏差と
金属帯板の冷却ドラムへの付着発生頻度との関係を整理
したものである。図において、ドラムギャップの目標値
と実績値との偏差は、前記のように連続鋳造の経過に伴
って減少するが、この偏差が１．５mm以下となると金属
帯板の冷却ドラムへの付着が発生しなくなる。FIG. 3 shows the relationship between the deviation between the target value and the actual value of the drum gap and the frequency of adhesion of the metal strip to the cooling drum, using the same data as shown in FIG. It is a thing. In the figure, the deviation between the target value and the actual value of the drum gap decreases with the progress of continuous casting as described above, but when the deviation becomes 1.5 mm or less, the metal strip adheres to the cooling drum. It will not occur.
【００１４】従って、鋳造開始からドラムギャップの目
標値と実績値との偏差が１．５mm以下に静定するまでの
間は、帯板搬送装置の搬送速度を冷却ドラムの周速度の
０．９７〜１．００倍の範囲とすることにより、冷却ド
ラムと帯板搬送装置との間の金属帯板を、ほぼ一定量の
ループを形成した状態で搬送することができる。この場
合、補正係数０．９７〜１．０による収縮量と実際の収
縮量との差により、ループ位置は鋳造の経過に伴って僅
かずつ変化するが、連続鋳造の初期は図２からも判るよ
うに３０〜４０秒程度であるためループ量の過大や過少
の問題は発生しない。Therefore, from the start of casting until the deviation between the target value and the actual value of the drum gap is settled to 1.5 mm or less, the transfer speed of the strip transfer device is 0.97 of the peripheral speed of the cooling drum. By setting the range to 1.00 times, the metal strip between the cooling drum and the strip transport device can be transported in a state where a substantially constant amount of loop is formed. In this case, the loop position changes little by little with the progress of casting due to the difference between the shrinkage amount due to the correction coefficient 0.97 to 1.0 and the actual shrinkage amount, but the initial stage of continuous casting can be seen from FIG. As described above, since it is about 30 to 40 seconds, there is no problem of the loop amount being too large or too small.
【００１５】しかし、帯板搬送装置の搬送速度を冷却ド
ラムの周速度の０．９７〜１．００倍とした金属帯板の
搬送を長時間継続すると、ループの変化量が蓄積されて
ループ量の過大や過少の問題が発生する。そのため、連
続鋳造の初期が経過した後においては、帯板搬送装置の
搬送速度を金属帯板のループ位置に応じた制御を行うこ
とで、前記ループ変化量の蓄積によるループ量の過大や
過少の問題を回避する。However, if the metal strip is transported for a long time with the transport speed of the strip transport device being 0.97 to 1.00 times the peripheral speed of the cooling drum, the loop change amount is accumulated and the loop amount is increased. Problems of over or under. Therefore, after the initial of continuous casting has passed, by controlling the transport speed of the strip transport device according to the loop position of the metal strip, an excessive or insufficient amount of loop due to the accumulation of the loop change amount Avoid the problem.
【００１６】[0016]
【発明の実施の形態】図４は、本発明を実施するための
装置として双ドラム式連続鋳造装置を例示したもので、
図において、一対の冷却ドラム１，２は、銅又は銅合金
製で周面及び端面には耐溶損性のＮｉメッキ等が施され
ており、１５〜１５０ｍ／min 程度の速度で矢印の方向
に回転駆動される。冷却ドラム１，２の軸９，１０は、
一対の軸受１１，１２によって回転自由に支持されてい
る（図４は軸９及び１０の各一端側の軸受１１及び１２
のみを示している）。軸受１１，１１及び１２，１２は
共通のフレーム１３（仮想線によって示している）に支
持されており、軸受１２，１２とフレーム１３との間に
は、一対の冷却ドラム１，２の間隙を定める油圧シリン
ダー１４，１４が設けられている。冷却ドラム２の外周
面近傍には一対の冷却ドラム１，２の間隙を検出するド
ラムギャップ検出器１５が設けられており、冷却ドラム
１の軸９には回転速度検出器１６が設けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 4 illustrates a twin drum type continuous casting apparatus as an apparatus for carrying out the present invention.
In the figure, the pair of cooling drums 1 and 2 are made of copper or a copper alloy, and the peripheral surface and end surfaces are plated with Ni, which is resistant to melting, and the like, at a speed of about 15 to 150 m / min in the direction of the arrow. It is driven to rotate. The shafts 9 and 10 of the cooling drums 1 and 2 are
It is rotatably supported by a pair of bearings 11 and 12 (FIG. 4 shows bearings 11 and 12 on one end side of shafts 9 and 10, respectively).
Only shown). The bearings 11, 11 and 12, 12 are supported by a common frame 13 (shown by an imaginary line), and a gap between the pair of cooling drums 1, 2 is provided between the bearings 12, 12 and the frame 13. Determining hydraulic cylinders 14, 14 are provided. A drum gap detector 15 that detects a gap between the pair of cooling drums 1 and 2 is provided near the outer peripheral surface of the cooling drum 2, and a rotation speed detector 16 is provided on the shaft 9 of the cooling drum 1. .
【００１７】一対のサイド堰３，３の冷却ドラム端面と
の摺動接触面には、耐熱性及び耐摩耗性の優れた例えば
Ｓｉ3 Ｎ4 ，ＳｉＣ，ＢＮ，ＺｒＯ2 ，Ａｌ2 Ｏ3 等の
高硬度微粒子を含むセラミック板が張り付けられてお
り、溶湯との接触面には、Ａｌ 2 Ｏ3 −Ｃ等の耐火煉瓦
が施工されている。サイド堰３は、２〜２０kgｆ／cm2
程度の押付力で一対の冷却ドラム１，２の両端面に押付
けられている。The end faces of the cooling drums of the pair of side dams 3 and 3
The sliding contact surface of has excellent heat resistance and wear resistance, for example
SiThreeNFour, SiC, BN, ZrOTwo, AlTwoOThreeEtc.
A ceramic plate containing fine particles of high hardness is attached
The contact surface with molten metal is TwoOThree-C etc. refractory bricks
Is being constructed. Side weir 3 is 2 to 20 kgf / cmTwo
Pressed against both ends of the pair of cooling drums 1 and 2 with a certain pressing force
Have been killed.
【００１８】タンディッシュ５内の金属溶湯を注湯ノズ
ル６により湯溜まり部４に供給し、湯溜まり部４の湯面
レベルが所定値になると、一対の冷却ドラム１，２を矢
印の方向に回転駆動させて連続鋳造を開始する。連続鋳
造を開始した後からドラムギャップ値の目標値と実績値
との偏差が１．５mm以下となるまでの鋳造初期において
は、冷却ドラムの回転速度を回転速度検出器１６により
検出し、検出した回転速度の信号は制御装置１７におい
て冷却ドラムの周速度に演算される。演算された冷却ド
ラムの周速度の信号は、制御装置１７において予め設定
された倍率である０．９６〜１．００によって補正さ
れ、制御装置１７は、補正信号によって帯板搬送装置７
の搬送速度を制御する。The molten metal in the tundish 5 is supplied to the basin 4 by the pouring nozzle 6, and when the basin level of the basin 4 reaches a predetermined value, the pair of cooling drums 1, 2 are moved in the direction of the arrow. It is rotated to start continuous casting. At the initial stage of casting after the start of continuous casting until the deviation between the target value and the actual value of the drum gap value becomes 1.5 mm or less, the rotation speed of the cooling drum is detected and detected by the rotation speed detector 16. The rotation speed signal is calculated by the controller 17 as the peripheral speed of the cooling drum. The calculated peripheral velocity signal of the cooling drum is corrected by a preset magnification of 0.96 to 1.00 in the control device 17, and the control device 17 uses the correction signal to correct the strip plate conveying device 7.
Control the transport speed of.
【００１９】ドラムギャップ検出器１５によって検出さ
れたドラムギャップの信号は制御装置１７において設定
されたドラムギャップの目標値と比較され、その偏差が
１．５mm以下になると、制御装置１７はループ位置検出
器８の信号を取り込んで、目標とするループ量と比較
し、制御装置１７はその差に応じた制御信号により帯板
搬送装置７を制御する。なお、薄帯搬送装置７として
は、薄帯の搬送速度を調整可能であればピンチロールの
他にブライドルロール等、他の搬送装置であってもよ
い。サイド堰としては、箱型の堰をドラム周面に載置す
る箱型堰や、扇状の堰をドラム周面間に挿入する内挿型
であってもよい。The signal of the drum gap detected by the drum gap detector 15 is compared with the target value of the drum gap set in the controller 17, and when the deviation becomes 1.5 mm or less, the controller 17 detects the loop position. The signal of the container 8 is fetched and compared with the target loop amount, and the control device 17 controls the strip conveying device 7 by the control signal according to the difference. Note that the ribbon transporting device 7 may be another transporting device such as a bridle roll or the like in addition to the pinch roll as long as the transporting speed of the ribbon can be adjusted. The side weir may be a box-type weir in which a box-shaped weir is placed on the peripheral surface of the drum or an insertion type in which a fan-shaped weir is inserted between the peripheral surfaces of the drum.
【００２０】[0020]
【実施例】双ドラム式連続鋳造装置を使用して、板厚
３．０mm、幅１３００mmのＳＵＳ３０４ステンレス鋼の
金属薄帯を連続鋳造した。なお、鋳造速度は６０ｍ／mi
n とし、サイド堰の冷却ドラム端面への押付け力は１０
kgｆ／cm2 とした。EXAMPLE A thin strip of SUS304 stainless steel having a plate thickness of 3.0 mm and a width of 1300 mm was continuously cast using a twin-drum type continuous casting apparatus. The casting speed is 60m / mi
n, and the pressing force of the side dam on the end surface of the cooling drum is 10
It was set to kgf / cm 2 .
【００２１】本発明例 前記連続鋳造において、連続鋳造を開始した後から検出
したドラムギャップの目標値と実績値との偏差が１．５
mm以下になるまでの鋳造初期では、帯板搬送装置の搬送
速度を冷却ドラムの周速度の０．９７〜１．００倍の範
囲とした。なお、ドラムギャップの目標値を３．０mmと
した。鋳造初期が経過した後においては帯板搬送装置の
搬送速度を金属帯板のループ位置に応じて制御した。そ
の結果、鋳造中において金属薄帯の冷却ドラムへの付着
が発生した場合でも、ループ制御が大きく乱れることは
なく、ドラム直下への鋳片の蓄積は起こらず、安定した
搬送状態を実現できた。Inventive Example In the above continuous casting, the deviation between the target value and the actual value of the drum gap detected after the continuous casting was started was 1.5.
In the initial stage of casting until the thickness became less than or equal to mm, the transport speed of the strip transport device was set to a range of 0.97 to 1.00 times the peripheral speed of the cooling drum. The target value of the drum gap was set to 3.0 mm. After the lapse of the initial casting, the transport speed of the strip transport device was controlled according to the loop position of the metal strip. As a result, even if the metal ribbon adhered to the cooling drum during casting, the loop control was not greatly disturbed, and no slab accumulation occurred directly below the drum, and a stable transfer state was realized. .
【００２２】比較例 これに対して、連続鋳造の開始から終了の全期間を通し
て帯板搬送装置の搬送速度を冷却ドラムの周速度の０．
９８倍に固定した結果、金属帯板の冷却ドラム位置と帯
板搬送装置位置とにおける搬送速度に僅かな不一致が生
じた。そのまま鋳造を継続した結果、金属帯板は冷却ド
ラム直下で過大に蓄積して搬送不能となり鋳造を停止し
た。また、連続鋳造の全期間を通して帯板搬送装置の搬
送速度を金属帯板のループ位置に応じて制御した結果、
鋳造初期において発生した金属帯板の冷却ドラムへの付
着に伴ってループ量が急増し搬送不能となった。Comparative Example On the other hand, during the entire period from the start to the end of the continuous casting, the transport speed of the strip transport device was set to 0.
As a result of fixing at 98 times, a slight disagreement occurred in the transport speed between the cooling drum position of the metal strip and the position of the strip transport device. As a result of continuing the casting as it was, the metal strip was excessively accumulated immediately below the cooling drum, and the conveyance became impossible, and the casting was stopped. Further, as a result of controlling the transport speed of the strip transport device according to the loop position of the metal strip throughout the entire period of continuous casting,
The amount of loops increased sharply along with the adhesion of the metal strip to the cooling drum that occurred in the early stage of casting, and the conveyance became impossible.
【００２３】[0023]
【発明の効果】金属帯板の連続鋳造において、冷却ドラ
ムから送りだされた金属帯板をフリーループを形成した
状態で搬送する場合は、連続鋳造の初期において金属帯
板が冷却ドラム周面に付着してドラム直下で蓄積する等
のトラブルが発生する。In the continuous casting of metal strips, when the metal strips sent from the cooling drum are conveyed in a state of forming a free loop, the metal strips are placed on the peripheral surface of the cooling drum at the initial stage of continuous casting. Problems such as adhesion and accumulation under the drum occur.
【００２４】本発明によれば鋳造の初期では冷却ドラム
の下流側に設けた帯板搬送装置の搬送速度を冷却ドラム
の周速度の０．９７〜１．００倍とするため、フリール
ープは大きく変動しない。その結果、ドラム直下に鋳片
が蓄積するような搬送トラブルは発生せず、安定した搬
送が可能となる。According to the present invention, in the initial stage of casting, the conveying speed of the strip conveying device provided on the downstream side of the cooling drum is set to 0.97 to 1.00 times the peripheral speed of the cooling drum, so that the free loop is large. It does not change. As a result, stable transport is possible without causing transport problems such as accumulation of slabs directly below the drum.
【図１】従来の双ドラム式連続鋳造装置を示す正面図で
ある。FIG. 1 is a front view showing a conventional twin-drum type continuous casting apparatus.
【図２】金属帯板連続鋳造の鋳造開始からの時間と金属
帯板の冷却ドラムへの付着頻度との関係を示す図であ
る。FIG. 2 is a diagram showing the relationship between the time from the start of casting of the metal strip continuous casting and the frequency of adhesion of the metal strip to the cooling drum.
【図３】金属帯板連続鋳造におけるドラムギャップと金
属帯板の冷却ドラムへの付着頻度との関係を示す図であ
る。FIG. 3 is a diagram showing the relationship between the drum gap and the frequency of adhesion of metal strips to a cooling drum in continuous casting of metal strips.
【図４】本発明を実施するための連続鋳造装置例を示す
正面図である。FIG. 4 is a front view showing an example of a continuous casting apparatus for carrying out the present invention.
１，２…冷却ドラム ３…サイド堰 ４…湯溜まり部 ５…タンディッシュ ６…注湯ノズル ７…帯板搬送装置 ８…ループ位置検出器 ９，１０…ドラム軸 １１，１２…軸受 １３…フレーム １４…油圧シリンダー １５…ドラムギャップ検出器 １６…回転速度検出器 １７…制御装置 Ｓ…金属帯板 1, 2 ... Cooling drum 3 ... Side weir 4 ... Hot water pool 5 ... Tundish 6 ... Pouring nozzle 7 ... Strip carrier 8 ... Loop position detector 9, 10 ... Drum shaft 11, 12 ... Bearing 13 ... Frame 14 ... Hydraulic cylinder 15 ... Drum gap detector 16 ... Rotation speed detector 17 ... Control device S ... Metal strip
Claims (3)
れた湯溜まり部に金属溶湯を供給し帯板状に凝固させて
金属帯板とし、続いて該金属帯板をフリーループ形成の
もとで帯板搬送装置により搬送する連続鋳造方法におい
て、前記連続鋳造の初期においては前記帯板搬送装置の
搬送速度を前記冷却ドラムの周速度の０．９７〜１．０
０倍の範囲とし、前記連続鋳造の初期が経過した後にお
いては前記帯板搬送装置の搬送速度を前記金属帯板のル
ープ位置に応じて制御することを特徴とする金属帯板連
続鋳造におけるフリーループ制御方法。1. A molten metal pool is supplied to a molten metal pool formed by a pair of rotating cooling drums and solidified into a strip shape to form a metal strip, and subsequently the metal strip is formed under free loop formation. In the continuous casting method of transporting with a strip transport device, in the initial stage of the continuous casting, the transport speed of the strip transport device is 0.97 to 1.0 of the peripheral speed of the cooling drum.
In the continuous casting of metal strip, the range is set to 0 times, and the transport speed of the strip transporting device is controlled according to the loop position of the metal strip after the initial stage of the continuous casting has passed. Loop control method.
始した後からドラムギャップ値の目標値と実績値との偏
差が１．５mm以下に静定するまでの間であることを特徴
とする請求項１に記載の金属帯板連続鋳造方法における
フリーループ制御方法。2. The initial stage of the continuous casting is a period after the continuous casting is started until the deviation between the target value and the actual value of the drum gap value is settled to 1.5 mm or less. The free loop control method in the metal strip continuous casting method according to claim 1.
れた湯溜まり部に金属溶湯を供給して帯板状に凝固させ
て金属帯板とし、続いて該金属帯板をフリーループ形成
のもとで帯板搬送装置により搬送する連続鋳造装置にお
いて、前記冷却ドラムの周速度を検出する回転速度検出
器と、前記金属帯板のループ位置を検出するループ位置
検出器と、前記一対の冷却ドラムの間隙を検出するドラ
ムギャップ検出器と、前記回転速度検出器の信号により
前記帯板搬送装置の搬送速度を制御した後、前記ループ
位置検出器の信号に応じて前記帯板搬送装置の搬送速度
を制御する制御装置とを設けたことを特徴とする金属帯
板連続鋳造におけるフリーループ制御装置。3. A molten metal is supplied to a molten metal pool formed by a pair of rotating cooling drums to solidify it into a strip shape to form a metal strip, and then the metal strip is formed into a free loop. In a continuous casting device that conveys by a strip plate conveying device, a rotation speed detector that detects a peripheral speed of the cooling drum, a loop position detector that detects a loop position of the metal strip, and a pair of cooling drums. A drum gap detector for detecting a gap, and after controlling the conveying speed of the strip conveying device by the signal of the rotation speed detector, the conveying speed of the strip conveying device is controlled in accordance with the signal of the loop position detector. A free-loop control device in continuous casting of metal strip, which is provided with a control device for controlling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12481696A JPH09308948A (en) | 1996-05-20 | 1996-05-20 | Method for controlling free loop in metallic strip continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12481696A JPH09308948A (en) | 1996-05-20 | 1996-05-20 | Method for controlling free loop in metallic strip continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09308948A true JPH09308948A (en) | 1997-12-02 |
Family
ID=14894831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12481696A Withdrawn JPH09308948A (en) | 1996-05-20 | 1996-05-20 | Method for controlling free loop in metallic strip continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09308948A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013103266A (en) * | 2011-11-16 | 2013-05-30 | Nippon Steel & Sumitomo Metal Corp | Method of manufacturing hot rolled steel sheet |
| CN110312581A (en) * | 2017-02-23 | 2019-10-08 | 普锐特冶金技术日本有限公司 | Thin plate continuous casting apparatus |
-
1996
- 1996-05-20 JP JP12481696A patent/JPH09308948A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013103266A (en) * | 2011-11-16 | 2013-05-30 | Nippon Steel & Sumitomo Metal Corp | Method of manufacturing hot rolled steel sheet |
| CN110312581A (en) * | 2017-02-23 | 2019-10-08 | 普锐特冶金技术日本有限公司 | Thin plate continuous casting apparatus |
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