JP2008213014A - Method for controlling shape thickness of strip - Google Patents

Method for controlling shape thickness of strip Download PDF

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JP2008213014A
JP2008213014A JP2007056902A JP2007056902A JP2008213014A JP 2008213014 A JP2008213014 A JP 2008213014A JP 2007056902 A JP2007056902 A JP 2007056902A JP 2007056902 A JP2007056902 A JP 2007056902A JP 2008213014 A JP2008213014 A JP 2008213014A
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thickness
roll
strip
width direction
steel strip
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Katsumi Nakayama
勝巳 中山
Shiro Osada
史郎 長田
Hisahiko Fukase
久彦 深瀬
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IHI Corp
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IHI Corp
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Priority to JP2007056902A priority Critical patent/JP2008213014A/en
Priority to PCT/AU2008/000318 priority patent/WO2008106744A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations

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  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To continuously cast a strip in such a manner that a sheet thickness target range is held. <P>SOLUTION: The thickness of the center in the sheet width direction of a steel strip 3 fed-out from a roll gap G in a twin roll casting machine is continuously measured by a contactless sensor 6, and when the measured value is likely to be lower than a sheet thickness target range, cooling rolls 1 are rotated in such a manner that the circumferential speed thereof is gradually reduced, to thereby suppress a reduction in the whole thickness of the steel strip 3. When the measured value of the thickness of the center in the sheet width direction of the steel strip 3 is likely to be higher than the sheet thickness target range, the cooling rolls 1 are rotated in such a manner that the circumferential speed thereof is gradually increased, to thereby suppress an increase in the whole thickness of the steel strip 3. Further, the thicknesses of a plurality of parts between the center and the edges in the sheet width direction of the steel strip 3 are continuously measured, and when any of these measured values is likely to deviate from the sheet thickness target range, the cooling rolls 1 are elastically deformed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明はストリップ形状厚さ制御方法に関するものである。   The present invention relates to a strip shape thickness control method.

溶湯からストリップを直接的に生産する手法として、水平に並べた一対のロールの間に溶湯を供給し、凝固した金属を薄帯状に送り出す双ロール連続鋳造法がある。   As a method for directly producing a strip from a molten metal, there is a twin-roll continuous casting method in which the molten metal is supplied between a pair of horizontally arranged rolls and the solidified metal is fed into a thin strip shape.

図２は双ロール鋳造機の一例を示すもので、水平に並べて配置した一対の冷却ロール１と、当該冷却ロール１に付帯する一対のサイド堰２とを備えている。   FIG. 2 shows an example of a twin roll casting machine, which includes a pair of cooling rolls 1 arranged horizontally and a pair of side weirs 2 attached to the cooling roll 1.

冷却ロール１は、その内部に冷却水が流通し、生産すべき鋼ストリップ３の板厚に応じてロール間隙Ｇを拡縮調整できるように構成されている。   The cooling roll 1 is configured such that cooling water circulates therein and the roll gap G can be adjusted in accordance with the thickness of the steel strip 3 to be produced.

冷却ロール１の回動方向及び速度は、各冷却ロール１の外周面が上側からロール間隙Ｇへ向かって等速で移動するように設定してある。   The rotation direction and speed of the cooling roll 1 are set so that the outer peripheral surface of each cooling roll 1 moves from the upper side toward the roll gap G at a constant speed.

一方のサイド堰２は、各冷却ロール１の一端に面接触し、他方のサイド堰２は、各冷却ロール１の他端に面接触している。   One side weir 2 is in surface contact with one end of each cooling roll 1, and the other side weir 2 is in surface contact with the other end of each cooling roll 1.

一対のサイド堰２の間には、溶湯供給ノズル４がロール間隙Ｇの真上に位置するように配置してあり、レードル（図示せず）から溶湯供給ノズル４へ溶鋼を注ぎ、冷却ロール１とサイド堰２で四方を囲まれる空間へ溶鋼を供給すると溶湯溜まり５が形成される。   Between the pair of side weirs 2, the molten metal supply nozzle 4 is arranged so as to be positioned immediately above the roll gap G. The molten steel is poured from the ladle (not shown) to the molten metal supply nozzle 4, and the cooling roll 1 When molten steel is supplied to a space surrounded on all sides by the side weir 2, a molten metal pool 5 is formed.

一対のサイド堰２の間には、溶湯供給ノズル４がロール間隙Ｇの真上に位置するように配置してあり、溶湯供給ノズル４から冷却ロール１とサイド堰２で四方を囲まれる空間へ溶鋼を供給すると溶湯溜まり５が形成される。   Between the pair of side weirs 2, the molten metal supply nozzle 4 is arranged so as to be positioned immediately above the roll gap G, and the space between the molten metal supply nozzle 4 and the cooling roll 1 and the side weir 2 is surrounded on all sides. When molten steel is supplied, a molten metal pool 5 is formed.

つまり、上記の溶湯溜まり５を形成させるとともに冷却水の流通により冷却ロール１を抜熱しながら回動させると、溶鋼が冷却ロール１外周面で凝固し、鋼ストリップ３がロール間隙Ｇの下方へ向けて送り出される。   That is, when the molten metal pool 5 is formed and the cooling roll 1 is rotated while removing the heat by circulation of the cooling water, the molten steel is solidified on the outer peripheral surface of the cooling roll 1 and the steel strip 3 is directed downward of the roll gap G. Sent out.

このとき、鋼ストリップ３の板厚が目標値となるように、各冷却ロール１のネック部分を枢支している軸箱（図示せず）に、互いに近接する向きへ押し付ける力を与える。   At this time, a force is applied to a shaft box (not shown) pivotally supporting the neck portion of each cooling roll 1 in a direction approaching each other so that the plate thickness of the steel strip 3 becomes a target value.

また、鋼ストリップの板幅方向の厚み分布を均等化するために、ロールクラウン修正用のテーパピストンを組み込んだ冷却ロールを用い、ロール間隙から送り出される鋼ストリップの板厚を計測し、その計測値に基づきロールクラウンを修正するようにした双ロール鋳造機も従前より提案されている（例えば、特許文献１参照）。
特開昭６０−２７４５８号公報 In addition, in order to equalize the thickness distribution of the steel strip in the plate width direction, the thickness of the steel strip fed from the roll gap is measured using a cooling roll incorporating a taper piston for correcting the roll crown. A twin roll casting machine in which the roll crown is corrected based on the above has also been proposed (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 60-27458

図２に示す双ロール鋳造機では、レードルから溶湯供給ノズル４へ注がれる溶鋼の温度が徐々に下がることに起因して、冷却ロール１外周面における凝固殻の生成が促進され、鋼ストリップ３の厚みが増えるという事象が発現する。   In the twin roll casting machine shown in FIG. 2, the temperature of the molten steel poured from the ladle to the molten metal supply nozzle 4 gradually decreases, so that the formation of solidified shells on the outer peripheral surface of the cooling roll 1 is promoted, and the steel strip 3 The phenomenon that the thickness of the increases increases.

また、溶湯供給ノズル４に対する溶鋼の注ぎ込みが完了したレードルを溶鋼が満たしてある次のレードルに切り換える際に、溶湯溜まり５の温度が上がることに起因して、冷却ロール１外周面における凝固殻の生成が遅滞し、鋼ストリップ３の厚みが減るという事象が発現する。   Further, when the ladle in which the molten steel has been poured into the molten metal supply nozzle 4 is switched to the next ladle filled with the molten steel, the temperature of the molten metal reservoir 5 rises, so that the solidified shell on the outer circumferential surface of the cooling roll 1 is increased. The phenomenon that the production is delayed and the thickness of the steel strip 3 is reduced appears.

更に、溶鋼の凝固温度は、炭素、珪素、マンガンの含有量によっても変わるので、板厚目標範囲を保って鋼ストリップ３を連続鋳造することは難しかった。   Furthermore, since the solidification temperature of the molten steel varies depending on the contents of carbon, silicon, and manganese, it has been difficult to continuously cast the steel strip 3 while maintaining the target thickness range.

本発明は上述した実情に鑑みてなしたもので、板厚目標範囲を保ってストリップを連続鋳造できるようにすることを目的としている。   The present invention has been made in view of the above-described circumstances, and an object thereof is to enable continuous casting of a strip while maintaining a plate thickness target range.

上記目的を達成するため、本発明では、双ロール鋳造機から一定のロール押圧力が付与された状態で送り出されるストリップの板幅方向中央の厚みを連続的に計測し、該計測値が板厚目標範囲を下回りそうなときに、冷却ロールを周速が漸減するように回転させて凝固殻がロール外周面に触れている時間を延ばし、前記計測値が板厚目標範囲を上回りそうなときに、冷却ロールを周速が漸増するように回転させて凝固殻がロール外周面に触れている時間を縮め、これに加えて、前記ストリップの板幅方向中央とエッジとの間の複数部位の厚みを連続的に計測し、これら計測値のうちのどれかが板厚目標範囲を外れそうなときに、該板厚目標範囲に計測値が含まれるように少なくとも一方の冷却ロールを弾性変形させる。   In order to achieve the above object, the present invention continuously measures the thickness in the center in the plate width direction of the strip fed in a state where a constant roll pressing force is applied from the twin roll casting machine, and the measured value is the plate thickness. When the temperature is likely to fall below the target range, the cooling roll is rotated so that the peripheral speed gradually decreases to extend the time for the solidified shell to touch the outer peripheral surface of the roll, and when the measured value is likely to exceed the target thickness range. The cooling roll is rotated so that the peripheral speed is gradually increased to reduce the time during which the solidified shell is in contact with the outer peripheral surface of the roll, and in addition, the thickness of a plurality of portions between the center of the strip in the plate width direction and the edge Are continuously measured, and when any of these measured values is likely to deviate from the target thickness range, at least one of the cooling rolls is elastically deformed so that the measured value is included in the target thickness range.

つまり、ストリップの板幅方向中央の厚み計測値が板厚目標範囲を上回りそうなときには、冷却ロールの周速を漸増させてロール外周面に凝固殻が触れる時間を短縮し、ロール間隙から送り出されるストリップ全体の厚み増加を抑える。   In other words, when the measured thickness value in the center of the strip width direction is likely to exceed the target thickness range, the peripheral speed of the cooling roll is gradually increased to reduce the time for the solidified shell to touch the outer peripheral surface of the roll, and it is fed from the roll gap. Reduces the increase in thickness of the entire strip.

反対に、ストリップの板幅方向中央の厚み計測値が板厚目標範囲を下回りそうなときには、冷却ロールの周速を漸減させてロール外周面に凝固殻が触れる時間を延長し、ロール間隙から送り出されるストリップ全体の厚み減少を抑える。   On the other hand, when the measured thickness value in the center of the strip width direction is likely to be below the target thickness range, the peripheral speed of the cooling roll is gradually decreased to extend the time for the solidified shell to touch the outer peripheral surface of the roll and sent out from the roll gap. Reduce the thickness reduction of the entire strip.

また、ストリップの各部位の厚み計測値が板厚目標範囲を外れそうなときには、少なくとも一方の冷却ロールを弾性変形させてロール間隙を最適な状態に近付け、当該ロール間隙から送り出されるストリップ板幅方向の厚みの偏差を小さくする。   When the measured thickness value of each part of the strip is likely to be outside the target thickness range, at least one of the cooling rolls is elastically deformed to bring the roll gap closer to the optimum state, and the strip plate width direction fed from the roll gap Reduce the deviation of the thickness.

更に、冷却ロールが一回転する度にストリップにマークを付すとともに、ストリップの板幅方向中央とエッジとの間の複数部位の厚みを連続的に計測し、冷却ロールに付したマークの通過を基準にストリップの長手方向への周期的な厚みの変動を把握し、この板厚変動範囲が小さくなるように少なくとも一方の冷却ロールを弾性変形させる。   In addition, the strip is marked each time the chill roll makes one revolution, and the thickness of multiple parts between the strip width direction center and the edge is continuously measured, and the passage of the mark attached to the chill roll is used as a reference. Then, a periodic variation of the thickness in the longitudinal direction of the strip is grasped, and at least one of the cooling rolls is elastically deformed so that the thickness variation range is reduced.

つまり、ストリップの各部位の厚み計測値が周期的な変動を呈するときには、少なくとも一方の冷却ロールを弾性変形させてロール間隙を最適な状態に近付け、当該ロール間隙から送り出されるストリップ板幅方向の厚みの偏差を小さくする。   That is, when the thickness measurement value of each part of the strip exhibits periodic fluctuations, the thickness in the width direction of the strip plate fed from the roll gap is made by elastically deforming at least one of the cooling rolls to bring the roll gap closer to the optimum state. Reduce the deviation.

本発明のストリップ形状厚さ制御方法によれば、下記のような優れた効果を奏し得る。   According to the strip shape thickness control method of the present invention, the following excellent effects can be obtained.

（１）ストリップ板幅方向中央の厚みの計測値に基づき、冷却ロールの周速を調整し、凝固殻がロール外周面に触れている時間を延長、または短縮させるので、目標板厚範囲に応じた形状のストリップを得ることができる。   (1) The peripheral speed of the cooling roll is adjusted based on the measured thickness at the center of the strip width direction, and the time during which the solidified shell touches the outer peripheral surface of the roll is extended or shortened. A strip with a different shape can be obtained.

（２）ストリップ板幅方向の複数部位の厚みの計測値に基づき、冷却ロールを弾性変形させてロール間隙を最適な状態に近付けるので、ストリップ板幅方向の厚み分布が均等化する。   (2) Since the cooling roll is elastically deformed and the roll gap is brought close to the optimum state based on the measured values of the thickness at a plurality of portions in the strip plate width direction, the thickness distribution in the strip plate width direction is equalized.

（３）ストリップ板幅方向の複数部位の厚みの計測値に基づき、一回転を周期にロールを弾性変形させてロール間隙の拡縮を抑えるので、ストリップ長手方向の厚みの偏差が小さくなり、よって、ストリップ全体の厚さ形状を一定に保てる。   (3) Since the roll is elastically deformed with a period of one rotation and the expansion and contraction of the roll gap is suppressed based on the measured values of the thickness in the strip plate width direction, the deviation of the thickness in the strip longitudinal direction is reduced. The thickness shape of the entire strip can be kept constant.

以下、本発明の実施の形態を図面に基づき説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は本発明のストリップ形状制御方法の一例であり、鋼ストリップ３を鋳造する一対の冷却ロール１と、該冷却ロール１が一回転するごとに鋼ストリップ３に対してマーク７を付すマーキング手段８とを備えた双ロール鋳造機を用いる。   FIG. 1 shows an example of a strip shape control method according to the present invention. A pair of cooling rolls 1 for casting a steel strip 3 and marking means for attaching a mark 7 to the steel strip 3 every time the cooling roll 1 rotates. 8 is used.

冷却ロール１には、サイド堰と溶湯供給ノズル（図示せず）が付帯し、冷却ロール１の間に溶鋼による溶湯溜まり５が形成される。   A side dam and a molten metal supply nozzle (not shown) are attached to the cooling roll 1, and a molten metal pool 5 made of molten steel is formed between the cooling rolls 1.

マーキング手段８は、一方の冷却ロール１の外周面ロールエッジ部付近に設けた凹状または凸状であって、当該冷却ロール１が一回転するごとに、マーキング手段８を凹状とした場合には、ロール間隙Ｇから送り出される鋼ストリップ３に凸状のマーク７が付され、マーキング手段８を凸状とした場合には、ロール間隙Ｇから送り出される鋼ストリップ３に凹状のマーク７が付される。   The marking means 8 is a concave shape or a convex shape provided near the outer peripheral surface roll edge portion of one cooling roll 1, and when the marking means 8 is concave every time the cooling roll 1 rotates, When the steel strip 3 delivered from the roll gap G is provided with a convex mark 7 and the marking means 8 is convex, the steel strip 3 delivered from the roll gap G is provided with a concave mark 7.

この冷却ロール１のロール間隙Ｇから送り出される鋼ストリップ３は、テーブルロール（図示せず）により横向きに案内され、ピンチロール１１を経て水平圧延機（図示せず）へ導かれる。   The steel strip 3 fed from the roll gap G of the cooling roll 1 is guided laterally by a table roll (not shown), and is guided to a horizontal rolling mill (not shown) through a pinch roll 11.

また、一方の冷却ロール１を弾性変形させるためにそのロールネック部には、シリンダなどのロール形状補正手段（図示せず）によって水平方向への押圧力Ｆが付与されるようにしてある。   Further, in order to elastically deform one of the cooling rolls 1, a horizontal pressing force F is applied to the roll neck portion by a roll shape correcting means (not shown) such as a cylinder.

双ロール鋳造機には、鋼ストリップ３の板幅方向の厚み分布を計測する非接触式センサ６、非接触式センサ６の至近に配置したマーク検知手段９、及び形状制御手段１０が付帯している。   The twin roll casting machine is accompanied by a non-contact sensor 6 for measuring the thickness distribution of the steel strip 3 in the plate width direction, a mark detection means 9 disposed in the vicinity of the non-contact sensor 6, and a shape control means 10. Yes.

非接触式センサ６は、複数の板厚計測器を鋼ストリップ３の板幅方向に並べたもので、ピンチロール１１よりも鋼ストリップ３の移動方向上流側に配置してあり、鋼ストリップ３の板幅方向中央、並びに板幅方向中央とエッジの間の複数部位の板厚を検出する。   The non-contact sensor 6 includes a plurality of plate thickness measuring devices arranged in the plate width direction of the steel strip 3, and is arranged on the upstream side of the pinch roll 11 in the moving direction of the steel strip 3. The plate thickness direction center, and the plate thicknesses at a plurality of locations between the plate width direction center and the edge are detected.

マーク検知手段９には、鋼ストリップ３に付されたマーク７を基準位置から鋼ストリップ３表面までの距離変動として検知する方式のもの、あるいは、鋼ストリップ３表面の形状が著しく変化している部分を画像処理によって検知する方式のものなどを用いる。   The mark detection means 9 has a method of detecting the mark 7 attached to the steel strip 3 as a variation in distance from the reference position to the surface of the steel strip 3, or a portion where the shape of the surface of the steel strip 3 is remarkably changed. A method of detecting the image by image processing is used.

形状制御手段１０は、溶湯溜まり５の温度に起因した鋼ストリップ３の厚みの過不足を防ぐ第１の形状保持機能と、冷却ロール１の形状に起因した鋼ストリップ３の厚み分布の不均一を防ぐ第２の形状保持機能とを具備している。   The shape control means 10 has a first shape holding function for preventing excessive or insufficient thickness of the steel strip 3 due to the temperature of the molten metal pool 5 and nonuniformity of the thickness distribution of the steel strip 3 due to the shape of the cooling roll 1. And a second shape holding function to prevent.

第１の形状保持機能は、予め設定してある鋼ストリップ３の板厚目標範囲と、非接触式センサ６からの厚み情報１２によって得た鋼ストリップ３の板幅方向中央の厚み計測値とを常に対比し、当該計測値が板厚目標範囲の上限値に近付きつつある際には、冷却ロール１の周速が漸増するように回転用モータ（図示せず）を作動させ、鋼ストリップ３の板幅方向中央の厚み計測値が板厚目標範囲の下限値に近付きつつある際には、冷却ロール１の周速が漸減するように回転用モータを作動させる。   The first shape holding function is a preset thickness target range of the steel strip 3 and a thickness measurement value at the center in the plate width direction of the steel strip 3 obtained from the thickness information 12 from the non-contact sensor 6. In contrast, when the measured value is approaching the upper limit value of the plate thickness target range, a rotating motor (not shown) is operated so that the peripheral speed of the cooling roll 1 gradually increases, and the steel strip 3 When the thickness measurement value at the center in the plate width direction is approaching the lower limit value of the plate thickness target range, the rotation motor is operated so that the peripheral speed of the cooling roll 1 gradually decreases.

冷却ロール１の周速は、鋼ストリップ３の移動速度と同じであるので、マーク検知手段９からのマーク通過情報１３によって得た単位時間あたりのマーク７の通過回数と、冷却ロール１の外径を根拠に求めることができる。   Since the peripheral speed of the cooling roll 1 is the same as the moving speed of the steel strip 3, the number of passes of the mark 7 per unit time obtained from the mark passing information 13 from the mark detection means 9 and the outer diameter of the cooling roll 1 Can be found on the basis of.

より具体的に述べると、例えば、板厚目標値が２ｍｍ、板厚目標範囲の上限値が２．１ｍｍ、下限値が１．９ｍｍとした場合に、鋼ストリップ３の板幅方向中央の厚み計測値が板厚目標値を上回って上限値に近付き始めると、形状制御手段１０が冷却ロール１の周速を漸増させてロール外周面に凝固殻が触れる時間を縮め、ロール間隙Ｇから送り出される鋼ストリップ３全体の厚み増加を抑える。   More specifically, for example, when the thickness target value is 2 mm, the upper limit value of the thickness target range is 2.1 mm, and the lower limit value is 1.9 mm, the thickness measurement at the center of the steel strip 3 in the plate width direction is performed. When the value exceeds the plate thickness target value and starts to approach the upper limit value, the shape control means 10 gradually increases the peripheral speed of the cooling roll 1 to shorten the time for the solidified shell to contact the outer peripheral surface of the roll, and the steel fed from the roll gap G The increase in thickness of the entire strip 3 is suppressed.

反対に、鋼ストリップ３の板幅方向中央の厚み計測値が板厚目標範囲を下回って下限値に近付き始めると、形状制御手段１０が冷却ロール１の周速を漸減させてロール外周面に凝固殻が触れる時間を延ばし、ロール間隙Ｇから送り出される鋼ストリップ３全体の厚み減少を抑える。   On the other hand, when the thickness measurement value at the center of the steel strip 3 in the plate width direction falls below the plate thickness target range and approaches the lower limit value, the shape control means 10 gradually decreases the peripheral speed of the cooling roll 1 and solidifies on the outer peripheral surface of the roll. The time for the shell to touch is extended, and the thickness reduction of the entire steel strip 3 fed from the roll gap G is suppressed.

従って、溶鋼の温度が徐々に下がることに起因して、鋼ストリップ３の厚みが増えるという事象を回避することができ、レードルの切り換え時に、溶湯溜まり５の温度が上がることに起因して、鋼ストリップ３の厚みが減るという事象も回避することができる。   Therefore, the phenomenon that the thickness of the steel strip 3 increases due to the temperature of the molten steel gradually decreasing can be avoided, and the temperature of the molten metal pool 5 increases when the ladle is switched. The phenomenon that the thickness of the strip 3 decreases can also be avoided.

第２の形状保持機能は、予め設定してある鋼ストリップ３の板厚目標範囲と、非接触式センサ６からの厚み情報１２によって得た鋼ストリップ３の板幅方向複数部位の厚み計測値とを常に対比し、当該計測値のうちのどれかが板厚目標範囲の上限値、あるいは下限値に近付きつつある際には、その部位の計測値が板厚目標値から離れないように前記ロール形状補正手段（図示せず）によって冷却ロール１を弾性変形させ、ロール間隙Ｇを最適な状態に近付ける。   The second shape maintaining function includes a preset thickness target range of the steel strip 3 and thickness measurement values at a plurality of portions in the plate width direction of the steel strip 3 obtained from the thickness information 12 from the non-contact sensor 6. When any one of the measured values is approaching the upper limit value or lower limit value of the plate thickness target range, the roll is controlled so that the measured value of the part does not deviate from the plate thickness target value. The cooling roll 1 is elastically deformed by a shape correcting means (not shown), and the roll gap G is brought close to an optimum state.

また、冷却ロール１に熱による局部的な塑性変形などが発現し、冷却ロール１が一回転するごとに鋼ストリップ３の各部の厚み計測値が周期的に変動を呈するときには、少なくとも一方の冷却ロール１を周期的に弾性変形させてロール間隙Ｇの拡縮を抑える。   Further, when local plastic deformation or the like due to heat occurs in the cooling roll 1 and the thickness measurement value of each part of the steel strip 3 periodically varies every time the cooling roll 1 makes one rotation, at least one of the cooling rolls 1 is periodically elastically deformed to suppress expansion and contraction of the roll gap G.

冷却ロール１の回動位置と、非接触式センサ６により得られる鋼ストリップ３の厚みの周期的な変動との相対関係は、ロールニップより非接触式センサ６に至る鋼ストリップ３の移動経路の長さと、非接触式センサ６とマーク検知手段９との間隔と、鋼ストリップ３の移動速度から求めることができる。   The relative relationship between the rotational position of the cooling roll 1 and the periodic fluctuation of the thickness of the steel strip 3 obtained by the non-contact sensor 6 is the length of the moving path of the steel strip 3 from the roll nip to the non-contact sensor 6. And the distance between the non-contact sensor 6 and the mark detection means 9 and the moving speed of the steel strip 3 can be obtained.

従って、ロール間隙Ｇから送り出される鋼ストリップ３の板幅方向の厚み分布を均等化することができる。   Therefore, the thickness distribution in the plate width direction of the steel strip 3 fed from the roll gap G can be equalized.

ロール形状補正手段は、ロールベンディング方式のものだけではなく、テーパピストン方式のものを採用してもよい。   The roll shape correction means may adopt not only a roll bending type but also a taper piston type.

なお、本発明のストリップ形状厚さ制御方法は、上述した実施の形態のみに限定されるものではなく、本発明の要旨を逸脱しない範囲において変更を加え得ることは勿論である。   It should be noted that the strip shape thickness control method of the present invention is not limited to the above-described embodiment, and it is needless to say that changes can be made without departing from the scope of the present invention.

本発明のストリップ形状厚さ制御方法は、様々な成分比率の鋼ストリップの製造に適用することができる。   The strip shape thickness control method of the present invention can be applied to the production of steel strips having various component ratios.

本発明のストリップ形状厚さ制御方法の一例を実施するための双ロール鋳造機を示す概念図である。It is a conceptual diagram which shows the twin roll casting machine for implementing an example of the strip shape thickness control method of this invention. 従来の双ロール鋳造機の一例を示す概念図である。It is a conceptual diagram which shows an example of the conventional twin roll casting machine.

符号の説明Explanation of symbols

１ 冷却ロール
３ 鋼ストリップ
６ 非接触式センサ
Ｇ ロール間隙 1 Cooling roll 3 Steel strip 6 Non-contact sensor G Roll gap

Claims (2)

双ロール鋳造機から一定のロール押圧力が付与された状態で送り出されるストリップの板幅方向中央の厚みを連続的に計測し、該計測値が板厚目標範囲を下回りそうなときに、冷却ロールを周速が漸減するように回転させて凝固殻がロール外周面に触れている時間を延ばし、前記計測値が板厚目標範囲を上回りそうなときに、冷却ロールを周速が漸増するように回転させて凝固殻がロール外周面に触れている時間を縮め、これに加えて、前記ストリップの板幅方向中央とエッジとの間の複数部位の厚みを連続的に計測し、これら計測値のうちのどれかが板厚目標範囲を外れそうなときに、該板厚目標範囲に計測値が含まれるように少なくとも一方の冷却ロールを弾性変形させることを特徴とするストリップ形状厚さ制御方法。   Continuously measure the thickness in the center of the strip width direction of the strip fed out with a constant roll pressing force from the twin roll casting machine, and when the measured value is likely to fall below the target thickness range, the cooling roll To increase the time that the solidified shell touches the outer peripheral surface of the roll, and when the measured value is likely to exceed the target thickness range, the peripheral speed of the cooling roll is gradually increased. Rotate to reduce the time that the solidified shell touches the outer peripheral surface of the roll, and in addition to this, continuously measure the thickness of multiple parts between the center of the strip in the plate width direction and the edge. A strip shape thickness control method comprising: elastically deforming at least one cooling roll so that a measured value is included in a target thickness range when any of them is likely to be outside the target thickness range. 冷却ロールが一回転する度にストリップにマークを付すとともに、ストリップの板幅方向中央とエッジとの間の複数部位の厚みを連続的に計測し、冷却ロールに付したマークの通過を基準にストリップの長手方向への周期的な厚みの変動を把握し、この板厚変動範囲が小さくなるように少なくとも一方の冷却ロールを弾性変形させる請求項１に記載のストリップ形状厚さ制御方法。   The strip is marked each time the chill roll rotates, and the thickness of multiple parts between the center and the edge of the strip width direction is continuously measured, and the strip is stripped based on the passage of the mark attached to the chill roll. The strip shape thickness control method according to claim 1, wherein a periodic thickness fluctuation in the longitudinal direction of the sheet is grasped, and at least one of the cooling rolls is elastically deformed so as to reduce the plate thickness fluctuation range.
JP2007056902A 2007-03-07 2007-03-07 Method for controlling shape thickness of strip Pending JP2008213014A (en)

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