JP6122692B2 - Detection method of slab joint in continuous casting of different steel types - Google Patents

Detection method of slab joint in continuous casting of different steel types Download PDF

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JP6122692B2
JP6122692B2 JP2013106213A JP2013106213A JP6122692B2 JP 6122692 B2 JP6122692 B2 JP 6122692B2 JP 2013106213 A JP2013106213 A JP 2013106213A JP 2013106213 A JP2013106213 A JP 2013106213A JP 6122692 B2 JP6122692 B2 JP 6122692B2
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泰史 吉村
泰史 吉村
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Nippon Steel Engineering Co Ltd
Nippon Steel Plant Designing Corp
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Description

本発明は、異鋼種連続鋳造における鋳片継目部の検出方法に関する。   The present invention relates to a method for detecting a slab joint in continuous casting of different steel types.

成分組成が異なる鋼種を連続的に鋳造する異鋼種連続鋳造では、先行チャージの溶鋼と後行チャージの溶鋼が鋳型内において混合しないようにするため、先行チャージの鋳造終了時に鋳片の引き抜きを一旦停止して、鋳型内の溶鋼中に仕切り金物を挿入させた後、鋳型内に後行チャージを注入して鋳片の引き抜きを再開している。   In continuous casting of different steel types, which continuously cast steel types with different component compositions, the slab is temporarily pulled out at the end of casting of the preceding charge in order to prevent the molten steel of the preceding charge and the molten steel of the subsequent charge from mixing in the mold. After stopping and inserting the partition metal into the molten steel in the mold, a subsequent charge is injected into the mold to resume drawing the slab.

先行鋳片と後行鋳片の継目部は、鋳型の下流側に設置された測長ロールによってトラッキングされており、測長ロールによるトラッキングデータに基づいて鋳片継目部の位置を演算し、鋳片の切断位置を決定している。
しかし、鋳片の熱収縮や、測長ロールと鋳片との間のスリップ等により、トラッキングデータに基づいて演算された鋳片継目部の位置と実際の鋳片継目部の位置との間には誤差が生じる。そのため、鋳片継目部に近接した位置で鋳片を切断することが難しく、製造歩留まりの低下を招いている。 The joint between the preceding slab and the subsequent slab is tracked by a length measuring roll installed downstream of the mold, and the position of the slab joint is calculated based on the tracking data from the length measuring roll. The cutting position of the piece is determined.
However, due to heat shrinkage of the slab, slip between the length measuring roll and the slab, etc., the position of the slab seam calculated based on the tracking data and the actual slab seam position Causes an error. For this reason, it is difficult to cut the slab at a position close to the slab seam, resulting in a decrease in manufacturing yield.

そこで、特許文献１では、鋳片の表面形状を計測するレーザ距離計をメジャリングロール（測長ロール）の下流側に設け、メジャリングロールにより鋳片継目をトラッキングして該継目がレーザ距離計の計測位置に到達する時点を予測し、該予測時点を含む特定範囲についてレーザ距離計により鋳片の表面形状を計測して真の鋳片継目を検出する発明が開示されている。そして、特許文献１によれば、トラッキングデータ及び形状計測結果の双方から鋳片継目の位置を検出するので、鋳片の熱収縮等による検出誤差が解消され、継目位置が正確に検出でき、製造歩留まりが向上するとされている。   Therefore, in Patent Document 1, a laser distance meter for measuring the surface shape of a slab is provided on the downstream side of a measuring roll (length measuring roll), the slab seam is tracked by the measuring roll, and the seam is a laser distance meter. An invention is disclosed in which the time point at which the measurement position is reached is predicted, and the surface shape of the slab is measured by a laser distance meter for a specific range including the predicted time point to detect the true slab seam. According to Patent Document 1, since the position of the slab joint is detected from both the tracking data and the shape measurement result, the detection error due to the thermal contraction of the slab is eliminated, the seam position can be accurately detected, The yield is said to improve.

特開平０８−０９４３０９号公報Japanese Patent Laid-Open No. 08-094309

図７は、異鋼種連続鋳造における一般的な鋳片継目部１０の断面を示したものである。同図よりわかるように、一般的な鋳片継目部１０は、仕切り金物２０を挟んで先行鋳片Ｓ１の後端部と後行鋳片Ｓ２の先端部が上方に反った形状をしており、先行鋳片Ｓ１の後端部と後行鋳片Ｓ２の先端部との間に割れ目２１が形成されている。   FIG. 7 shows a cross section of a general slab joint 10 in different steel type continuous casting. As can be seen from the figure, the general slab joint portion 10 has a shape in which the rear end portion of the preceding slab S1 and the front end portion of the subsequent slab S2 are warped upward with the partition metal 20 interposed therebetween. A crack 21 is formed between the rear end portion of the preceding slab S1 and the front end portion of the subsequent slab S2.

特許文献１記載の発明では、現在点が、比較幅７０ｍｍ離れた前の点より１８ｍｍ以上深いとき、前の点の位置における水平面を基準面とする。そして、基準面からの深さがしきい値３０ｍｍを超える点が５回以上連続して計測されたとき、その位置を鋳片継目部１０と判定する。
このように、特許文献１記載の発明では、現在点と該現在点から比較幅、離れた前の点の２点のみで基準面を設定するため、大きなしきい値を設定しないと、鋳片継目部１０であるかどうか判定することができないという難点がある。そのため、鋳片継目部１０の割れ目２１が浅い場合、特許文献１記載の発明では鋳片継目部１０を検出することができない。 In the invention described in Patent Document 1, when the current point is 18 mm or more deeper than the previous point that is 70 mm away from the comparison width, the horizontal plane at the position of the previous point is used as the reference plane. And when the point from which the depth from a reference plane exceeds the threshold value 30 mm is measured 5 times or more continuously, the position is determined as the slab joint part 10.
As described above, in the invention described in Patent Document 1, the reference plane is set only with the current point, the comparison width from the current point, and the previous two points away from each other. There is a difficulty that it cannot be determined whether or not it is the joint portion 10. Therefore, when the crack 21 of the slab joint portion 10 is shallow, the slab joint portion 10 cannot be detected in the invention described in Patent Document 1.

また、特許文献１記載の発明では鋳片継目部１０の検出にレーザ距離計を用いているが、検出器の種類に関わりなく、鋳片継目部１０の位置を検出できることが望ましい。   Further, in the invention described in Patent Document 1, a laser distance meter is used for detecting the slab joint 10, but it is desirable that the position of the slab joint 10 can be detected regardless of the type of detector.

本発明はかかる事情に鑑みてなされたもので、従来検出が難しかった浅い凹みを有する鋳片継目部の位置を、検出器の種類に関わりなく確実に検出することが可能な異鋼種連続鋳造における鋳片継目部の検出方法を提供することを目的とする。   The present invention has been made in view of such circumstances, and in the different steel type continuous casting capable of reliably detecting the position of the cast slab joint portion having a shallow recess, which has been difficult to detect conventionally, regardless of the type of the detector. It aims at providing the detection method of a slab joint part.

上記目的を達成するため、本発明は、異鋼種連続鋳造における鋳片継目部の位置を測長ロールでトラッキングして鋳片の切断位置を決定する方法において、
前記測長ロールによってトラッキングされた鋳片継目部の前後設定範囲について、前記測長ロールの下流側に設置した検出器により、該検出器による測定開始点からの鋳片上面の高さｈｉを一定時間間隔で測定して、記憶手段に記憶されている前記鋳片上面の最高高さｈＭＡＸ （初期値＝ゼロ）と比較し、
前記鋳片上面の高さｈｉ ＞前記鋳片上面の最高高さｈＭＡＸ のとき、前記鋳片上面の高さｈｉを前記鋳片上面の最高高さｈＭＡＸとして前記記憶手段に記憶し、
前記鋳片上面の高さｈｉ ≦前記鋳片上面の最高高さｈＭＡＸ −設定値αのとき、前記鋳片上面の高さｈｉの位置を鋳片継目部と判定し、
前記鋳片上面の高さｈ ｉ ≦前記鋳片上面の最高高さｈ ＭＡＸ 、かつ前記鋳片上面の高さｈ ｉ ＞前記鋳片上面の最高高さｈ ＭＡＸ −設定値αのとき、前記鋳片上面の高さｈ ｉ の位置は鋳片継目部ではなく鋳片表面の凹凸であると判定することを特徴としている。
ここで、「鋳片上面」とは、鋳片の面のうち、鋳片継目部がせり上がっている側の面を指す。 In order to achieve the above object, the present invention is a method for determining the cutting position of a slab by tracking the position of a slab joint in a different steel type continuous casting with a length measuring roll,
About the front and rear set range of the slab seam tracked by the length measuring roll, the height h i of the upper surface of the slab from the measurement start point by the detector is set by a detector installed on the downstream side of the length measuring roll. Measured at regular time intervals and compared with the maximum height h MAX (initial value = zero) of the upper surface of the slab stored in the storage means,
When the height h i of the upper surface of the slab > the maximum height h MAX of the upper surface of the slab, the height h i of the upper surface of the slab is stored in the storage means as the maximum height h MAX of the upper surface of the slab. ,
Maximum height h MAX height h i ≦ the slab top surface of the slab top surface - when the set value alpha, the position of the height h i of the slab top surface determines that slab seam portion,
The slab top surface of the height h i ≦ the slab up to the height h MAX of the upper surface, and the slab top surface of the height h i> maximum height h MAX of the slab top surface - when the set value alpha, the It is characterized in that the position of the height h i on the upper surface of the slab is determined not to be a slab joint but to be uneven on the slab surface .
Here, “the upper surface of the slab” refers to the surface of the surface of the slab where the slab seam is raised.

本発明に係る異鋼種連続鋳造における鋳片継目部の検出方法の原理を説明するための模式図を図１に示す。
（１）鋳型で鋳造された鋳片が下流方向に搬送され、鋳片継目部を含む前後設定範囲の前端部が検出器の位置に到達すると、測定開始点の高さに対する鋳片上面の高さｈｉ（ｉは自然数）が検出器によって一定時間間隔で測定される。
（２）測定された鋳片上面の高さｈｉは、記憶手段に記憶されている鋳片上面の最高高さｈＭＡＸと比較される。先行鋳片の後端部は後方に向けてせり上がっているため、鋳片上面の最高高さｈＭＡＸがｈ１、ｈ２、ｈ３、…と順次更新され、記憶手段に記憶される。図１の例では、鋳片上面の最高高さｈＭＡＸはｈｋ−１まで更新され、記憶手段に記憶される。
（３）ｈｋ−１の次に測定された鋳片上面の高さｈｋは鋳片上面の最高高さｈＭＡＸより小さくなるが、その差が設定値α以上であるとき、鋳片上面の高さｈｋの位置が鋳片継目部と判定される。一方、測定された鋳片上面の高さｈｋが鋳片上面の最高高さｈＭＡＸより小さく、その差が設定値α未満であるとき、ｈｋの位置は鋳片継目部ではなく鋳片表面の小さな凹凸であると判定される。 FIG. 1 shows a schematic diagram for explaining the principle of a method for detecting a slab joint portion in continuous casting of different steel types according to the present invention.
(1) When the slab cast by the mold is conveyed in the downstream direction and the front end of the front / rear setting range including the slab seam reaches the position of the detector, the height of the upper surface of the slab relative to the height of the measurement start point H i (i is a natural number) is measured by the detector at regular time intervals.
(2) The measured height h i of the upper surface of the slab is compared with the maximum height h MAX of the upper surface of the slab stored in the storage means. Since the rear end portion of the preceding slab is raised rearward, the maximum height h MAX on the upper surface of the slab is sequentially updated as h 1 , h 2 , h 3 ,... And stored in the storage means. In the example of FIG. 1, the maximum height h MAX on the upper surface of the slab is updated to h k−1 and stored in the storage means.
(3) The height h k of the upper surface of the slab measured next to h k−1 is smaller than the maximum height h MAX of the upper surface of the slab, but when the difference is greater than or equal to the set value α, The position of the height h k is determined to be the cast seam portion. On the other hand, when the measured height h k of the upper surface of the slab is smaller than the maximum height h MAX of the upper surface of the slab and the difference is less than the set value α, the position of h k is not the slab joint but the slab. It is determined that there are small irregularities on the surface.

本発明では、鋳片継目部前後の形状を考慮し、鋳片上面の最高高さｈＭＡＸを徐々に更新していくため、鋳片継目部の判定基準となる設定値αを小さな値とすることができる。 In the present invention, the maximum height h MAX on the upper surface of the slab is gradually updated in consideration of the shape before and after the slab seam, so that the set value α that is a criterion for determining the slab seam is set to a small value. be able to.

また、本発明に係る異鋼種連続鋳造における鋳片継目部の検出方法では、前記検出器が、前記鋳片を圧下する昇降ロールシリンダに内蔵されたインロッドセンサであってもよい。
当該構成では、連続鋳造設備に備えられている軽圧下装置を構成する昇降ロールシリンダに内蔵されているインロッドセンサを、鋳片継目部を検出するための検出器として使用するので、鋳片継目部を検出するための専用の検出器が不要となり、コスト削減を図ることができる。 Moreover, in the detection method of the slab joint part in the different steel types continuous casting which concerns on this invention, the in-rod sensor incorporated in the raising / lowering roll cylinder which rolls down the said slab may be sufficient as the said detector.
In the said structure, since the in-rod sensor incorporated in the raising / lowering roll cylinder which comprises the light reduction device with which the continuous casting equipment is equipped is used as a detector for detecting a slab joint part, This eliminates the need for a dedicated detector for detecting the part, thereby reducing the cost.

また、本発明に係る異鋼種連続鋳造における鋳片継目部の検出方法では、前記検出器が、非接触式変位計であってもよい。
当該構成では、鋳片継目部を検出するための検出器として非接触式変位計を使用するので、高温状態の鋳片に接触することなく、離れた位置から鋳片継目部を検出することができる。 In the method for detecting a slab joint in continuous casting of different steel types according to the present invention, the detector may be a non-contact displacement meter.
In this configuration, since a non-contact displacement meter is used as a detector for detecting the slab seam, it is possible to detect the slab seam from a remote position without contacting the high temperature slab. it can.

本発明に係る異鋼種連続鋳造における鋳片継目部の検出方法では、鋳片継目部前後の形状を考慮し、鋳片上面の最高高さｈＭＡＸを徐々に更新していき、鋳片上面の高さｈｉが鋳片上面の最高高さｈＭＡＸより設定値α以上小さくなったとき、鋳片上面の高さｈｉの位置を鋳片継目部と判定するので、鋳片継目部の判定基準となる設定値αを小さな値として、従来検出が難しかった浅い凹みを有する鋳片継目部の位置を確実に検出することができる。また、検出器の種類に依存することもない。 In the method of detecting a slab joint in continuous casting of different steel types according to the present invention, the maximum height h MAX on the upper surface of the slab is gradually updated in consideration of the shape before and after the slab joint. when the height h i is smaller than the predetermined value α than the maximum height h MAX of the slab top surface, so determining the position of the height h i of the slab top surface and the billet seam section, the determination of the slab joint portion By setting the reference set value α as a small value, it is possible to reliably detect the position of the slab joint portion having a shallow recess that has been difficult to detect in the past. Also, it does not depend on the type of detector.

本発明に係る異鋼種連続鋳造における鋳片継目部の検出方法の原理を説明するための模式図である。It is a schematic diagram for demonstrating the principle of the detection method of the slab joint part in the different steel type continuous casting which concerns on this invention. 本発明の第１の実施の形態に係る異鋼種連続鋳造における鋳片継目部の検出方法が適用された連続鋳造設備のブロック図である。It is a block diagram of the continuous casting equipment to which the detection method of the slab joint part in the different steel type continuous casting which concerns on the 1st Embodiment of this invention was applied. 同異鋼種連続鋳造における鋳片継目部の検出方法を説明するための模式図である。It is a schematic diagram for demonstrating the detection method of the slab joint part in the same dissimilar steel type continuous casting. 同異鋼種連続鋳造における鋳片継目部の検出方法のアルゴリズムを示したフロー図である。It is the flowchart which showed the algorithm of the detection method of the slab joint part in the same steel type continuous casting. 同異鋼種連続鋳造における鋳片継目部の検出方法によって鋳片継目部を検出できなかった場合の模式図である。It is a schematic diagram when a slab joint part cannot be detected by the detection method of a slab joint part in the same different steel type continuous casting. 本発明の第２の実施の形態に係る異鋼種連続鋳造における鋳片継目部の検出方法が適用された連続鋳造設備のブロック図である。It is a block diagram of the continuous casting equipment to which the detection method of the slab joint part in the different steel type continuous casting which concerns on the 2nd Embodiment of this invention was applied. 異鋼種連続鋳造における一般的な鋳片継目部の断面を示した模式図である。It is the schematic diagram which showed the cross section of the general slab joint part in different steel type continuous casting.

続いて、添付した図面を参照しつつ、本発明を具体化した実施の形態について説明し、本発明の理解に供する。   Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

［第１の実施の形態］
本発明の第１の実施の形態に係る異鋼種連続鋳造における鋳片継目部の検出方法（以下、単に「鋳片継目部の検出方法」と呼ぶ。）が適用された連続鋳造設備のブロック図を図２に示す。
前述したように、成分組成が異なる鋼種を連続的に鋳造する異鋼種連続鋳造では、先行チャージの溶鋼と後行チャージの溶鋼が鋳型１１内において混合しないようにするため、先行チャージの鋳造終了時に鋳片Ｓの引き抜きを一旦停止して、鋳型１１内の溶鋼中に仕切り金物２０を浸漬させた後、鋳型１１内に後行チャージを注入して鋳片Ｓの引き抜きを再開する。
鋳型１１で鋳造された鋳片Ｓは、鋳型１１の下流側に設置されている軽圧下装置２４で圧下された後、軽圧下装置２４の下流側に設置されているガスカッターなどの切断機１２で切断される。 [First Embodiment]
The block diagram of the continuous casting equipment to which the detection method (henceforth "the detection method of a slab joint part") of the cast slab joint part in the different steel type continuous casting which concerns on the 1st Embodiment of this invention was applied. Is shown in FIG.
As described above, in different steel type continuous casting in which steel types having different component compositions are continuously cast, in order to prevent the molten steel of the preceding charge and the molten steel of the subsequent charge from being mixed in the mold 11, After the slab S is temporarily pulled out and the partition metal 20 is immersed in the molten steel in the mold 11, the subsequent charge is injected into the mold 11 and the slab S is pulled out again.
The slab S cast by the mold 11 is reduced by a light reduction device 24 installed on the downstream side of the mold 11, and then a cutting machine 12 such as a gas cutter installed on the downstream side of the light reduction device 24. It is cut at.

鋳型１１と軽圧下装置２４との間（鋳型１１から程遠くない位置）には、仕切り金物２０を含む鋳片継目部１０の位置をトラッキング（追跡）するための測長ロール１３が設置されている。測長ロール１３は、鋳片Ｓに当接し、鋳片Ｓの移動に伴って回転する。測長ロール１３の回転数は、測長ロール１３に接続されたパルスジェネレータ１４によって検出され、演算装置１５に出力される。
また、本実施の形態では、軽圧下装置２４に配設されている複数の昇降ロールシリンダ２５のうち、最上流側に設置されている昇降ロールシリンダ２５に内蔵されているインロッドセンサ２６（検出器の一例）の検出信号が演算装置１５に出力される。 Between the mold 11 and the light reduction device 24 (a position not far from the mold 11), a length measuring roll 13 for tracking the position of the cast piece joint portion 10 including the partition hardware 20 is installed. . The length measuring roll 13 contacts the slab S and rotates as the slab S moves. The rotation speed of the length measuring roll 13 is detected by a pulse generator 14 connected to the length measuring roll 13 and output to the arithmetic device 15.
In the present embodiment, among the plurality of lifting roll cylinders 25 disposed in the light reduction device 24, an in-rod sensor 26 (detection) built in the lifting roll cylinder 25 installed on the most upstream side. The detection signal of an example of the detector is output to the arithmetic unit 15.

演算装置１５は、パルスジェネレータ１４（測長ロール１３）及びインロッドセンサ２６の出力信号に基づいて鋳片継目部１０の位置を検出し、その結果に従って切断機１２に切断指令を発すると共に、軽圧下装置２４を構成する軽圧下ロール２７の昇降退避動作を制御する。
なお、軽圧下ロール２７の昇降退避動作とは、上方にせり上がった鋳片継目部１０を軽圧下ロール２７が圧下しないようにするため、鋳片継目部１０が近づいてきたら軽圧下ロール２７を上昇させ、鋳片継目部１０が通過したら軽圧下ロール２７を下降させる動作のことである。 The arithmetic unit 15 detects the position of the slab joint 10 based on the output signals of the pulse generator 14 (length measuring roll 13) and the in-rod sensor 26, and issues a cutting command to the cutting machine 12 according to the result. The lifting / lowering operation of the light reduction roll 27 constituting the reduction device 24 is controlled.
In addition, in order to prevent the light pressure lowering roll 27 from rolling down the slab joint portion 10 that has risen upward, the light pressure lowering roll 27 moves up and down, and when the slab seam portion 10 approaches, the light pressure lowering roll 27 is moved downward. It is an operation of raising the light pressure lowering roll 27 when the slab joint portion 10 is raised.

図２に示すように、演算装置１５は、パルスジェネレータ１４の出力信号に基づいて鋳片継目部１０の位置をトラッキングする継目トラッキング部１７と、継目トラッキング部１７によるトラッキングデータとインロッドセンサ２６の出力信号に基づいて鋳片継目部１０の位置を検出する継目検出部１８と、鋳片上面の最高高さｈＭＡＸを記憶する記憶部１９（記憶手段）と、切断機１２及び軽圧下装置２４の制御を行う切断・軽圧下制御部２２とを備えている。 As shown in FIG. 2, the arithmetic unit 15 includes a seam tracking unit 17 that tracks the position of the slab joint 10 based on the output signal of the pulse generator 14, tracking data from the seam tracking unit 17, and the in-rod sensor 26. A seam detection unit 18 that detects the position of the slab joint 10 based on the output signal, a storage unit 19 (storage unit) that stores the maximum height h MAX of the upper surface of the slab, a cutting machine 12 and a light reduction device 24. And a cutting / light pressure control unit 22 that performs the above control.

継目トラッキング部１７は、鋳型１１内の溶鋼湯面から仕切り金物２０をセットする位置までの距離、鋳型１１内の溶鋼湯面から測長ロール１３までの距離、並びに測長ロール１３の直径又は周長と測長ロール１３の回転数から算出した鋳片Ｓの移動量に基づいて鋳片継目部１０の位置をトラッキングし、その結果を継目検出部１８に出力する。   The seam tracking unit 17 includes a distance from the molten steel surface in the mold 11 to a position where the partition metal fitting 20 is set, a distance from the molten steel surface in the mold 11 to the length measuring roll 13, and the diameter or circumference of the length measuring roll 13. The position of the slab joint 10 is tracked based on the amount of movement of the slab S calculated from the length and the number of rotations of the length measuring roll 13, and the result is output to the joint detector 18.

継目検出部１８は、継目トラッキング部１７による鋳片継目部１０を含む前後設定範囲（例えば鋳片継目部１０を挟んで前後各１０００ｍｍ程度）の前端部がインロッドセンサ２６の位置に到達した時点から、インロッドセンサ２６によって一定時間間隔ごとに測定される、測定開始点の高さに対する鋳片上面の高さｈｉ（ｉは自然数）を、記憶部１９に記憶されている鋳片上面の最高高さｈＭＡＸと比較して鋳片継目部１０の正確な位置を検出する。
なお、一定時間間隔とは測定周期のことであり、例えば鋳片Ｓの移動量５ｍｍごとに鋳片上面の高さｈｉを測定する場合、測定周期＝５ｍｍ／鋳片Ｓの搬送速度となる。 The joint detection unit 18 is a time point when the front end of the front / rear setting range including the slab joint 10 by the joint tracking unit 17 (for example, about 1000 mm before and after the slab joint 10) reaches the position of the in-rod sensor 26. Thus, the height h i (i is a natural number) of the slab upper surface with respect to the height of the measurement start point, which is measured by the in-rod sensor 26 at regular time intervals, is stored on the slab upper surface stored in the storage unit 19. Compared with the maximum height h MAX , the exact position of the slab joint 10 is detected.
The fixed time interval is a measurement cycle. For example, when measuring the height h i of the upper surface of the slab for every 5 mm of movement of the slab S, the measurement cycle = 5 mm / the transport speed of the slab S. .

継目検出部１８によって検出された鋳片継目部１０の正確な位置は、継目トラッキング部１７にフィードバックされ、トラッキングデータの補正が行われる。補正されたトラッキングデータは切断・軽圧下制御部２２に出力される。
切断・軽圧下制御部２２は、補正されたトラッキングデータに基づいて、切断機１２に対して切断指令を発すると共に、軽圧下装置２４に配設されている複数の昇降ロールシリンダ２５の昇降退避動作を制御する。 The accurate position of the slab joint 10 detected by the joint detector 18 is fed back to the seam tracking unit 17 to correct the tracking data. The corrected tracking data is output to the cutting / light pressure control unit 22.
The cutting / light pressure reduction control unit 22 issues a cutting command to the cutting machine 12 based on the corrected tracking data, and moves up and down the plurality of lifting roll cylinders 25 disposed in the light pressure lowering device 24. To control.

次に、継目検出部１８で実行される鋳片継目部１０の検出アルゴリズムについて、図３及び図４を用いて説明する。
（１）継目トラッキング部１７による鋳片継目部１０を含む前後設定範囲の前端部がインロッドセンサ２６の位置に到達したかどうか定期的にチェックされ（ＳＴ１）、鋳片継目部１０を含む前後設定範囲の前端部がインロッドセンサ２６の位置に到達した時点で、鋳片上面の最高高さｈＭＡＸの初期値としてゼロが設定され、記憶部１９に記憶される（ＳＴ２）。
（２）インロッドセンサ２６による測定が開始されると、鋳片上面の高さｈ１が測定開始点の高さからの増分量Δｈ１として測定される。次いで、ｈ１から１測定周期後の鋳片上面の高さｈ２がｈ１＋増分量Δｈ２、ｈ２から１測定周期後の鋳片上面の高さｈ３がｈ２＋増分量Δｈ３等と測定され、継目検出部１８に出力される。 Next, the detection algorithm of the slab joint 10 executed by the joint detector 18 will be described with reference to FIGS. 3 and 4.
(1) It is periodically checked whether or not the front end of the front / rear setting range including the slab seam 10 by the seam tracking unit 17 has reached the position of the in-rod sensor 26 (ST1). When the front end of the setting range reaches the position of the in-rod sensor 26, zero is set as an initial value of the maximum height h MAX of the upper surface of the slab and stored in the storage unit 19 (ST2).
(2) When the measurement by the in-rod sensor 26 is started, the height h 1 of the slab top surface is measured as an incremental amount Delta] h 1 from the height of the measurement start point. Then, the height h 2 of the slab top surface after one measuring period from h 1 is h 1 + increment Delta] h 2, h 2 from the first height h 3 of the slab top surface after the measurement period is h 2 + increments Delta] h It is measured as 3 etc. and is output to the joint detection unit 18.

（３）継目検出部１８では、測定された鋳片上面の高さｈｉ（ｉは自然数）が、記憶部１９に記憶されている鋳片上面の最高高さｈＭＡＸより設定値α以上小さいかどうか、即ち、ｈＭＡＸ−ｈｉ≧αが満足されるか否かチェックされる（ＳＴ３）。なお、設定値αの値としては、例えば２ｍｍ程度でよい。
（４）ｈＭＡＸ−ｈｉ≧αが満足されない場合、ｈＭＡＸ＜ｈｉが満足されるどうか、即ち、測定された鋳片上面の高さｈｉが、記憶部１９に記憶されている鋳片上面の最高高さｈＭＡＸより大きいかどうかチェックされる（ＳＴ５）。 (3) In the joint detection unit 18, the measured height h i (i is a natural number) of the slab upper surface is smaller than the maximum height h MAX of the slab upper surface stored in the storage unit 19 by a set value α or more. Whether or not h MAX −h i ≧ α is satisfied (ST3). The set value α may be about 2 mm, for example.
(4) If h MAX -h i ≧ α is not satisfied, whether h MAX <h i is satisfied, i.e., the height h i of the measured slab upper surface, cast stored in the storage unit 19 It is checked whether it is larger than the maximum height h MAX of the upper surface of one side (ST5).

（５）ｈＭＡＸ＜ｈｉである場合、測定された鋳片上面の高さｈｉが鋳片上面の最高高さｈＭＡＸとして記憶部１９に記憶され（ＳＴ６）、（３）に戻る。図３の例では、ｈ１からｈｋ−１まで順次、鋳片上面の最高高さｈＭＡＸが更新されていく。
（６）なお、ｈＭＡＸ≧ｈｉである場合は、測定された鋳片上面の高さｈｉの位置は鋳片継目部１０ではなく鋳片表面の小さな凹凸であると判定され、（３）に戻る。 (5) When h MAX <h i , the measured height h i of the upper surface of the slab is stored in the storage unit 19 as the maximum height h MAX of the upper surface of the slab (ST6), and the process returns to (3). In the example of FIG. 3, the maximum height h MAX on the upper surface of the slab is sequentially updated from h 1 to h k−1 .
(6) In the case a h MAX ≧ h i, the position of the height h i of the measured slab top surface is determined to be small irregularities of rather slab surface the slab seam section 10, (3 Return to).

（７）一方、ｈＭＡＸ−ｈｉ≧αが満足される場合、即ち、測定された鋳片上面の高さｈｉが、記憶部１９に記憶されている鋳片上面の最高高さｈＭＡＸより設定値α以上小さい場合は、測定された鋳片上面の高さｈｉの位置が鋳片継目部１０と判定され、鋳片継目部１０の位置が継目トラッキング部１７に出力される（ＳＴ４）。図３の例では、測定された鋳片上面の高さｈｋの位置が鋳片継目部１０と判定される。 (7) On the other hand, when h MAX −h i ≧ α is satisfied, that is, the measured height h i of the slab upper surface is the maximum height h MAX of the slab upper surface stored in the storage unit 19. If the set value α is smaller than the set value α, the measured position of the slab upper surface height h i is determined as the slab seam 10 and the position of the slab seam 10 is output to the seam tracking unit 17 (ST4). ). In the example of FIG. 3, the position of the measured height h k on the upper surface of the slab is determined as the slab joint 10.

図５は、本実施の形態における鋳片継目部の検出方法によって鋳片継目部１０を検出できなかった場合を示している。鋳片継目部１０に形成された割れ目２１が非常に浅く、図５に示すように、割れ目２１の深さがα未満の場合、本実施の形態における鋳片継目部の検出方法では、鋳片継目部１０を見逃すことになる。   FIG. 5 shows a case where the slab joint portion 10 cannot be detected by the method for detecting a slab joint portion in the present embodiment. When the crack 21 formed in the slab joint 10 is very shallow and the depth of the crack 21 is less than α as shown in FIG. 5, the slab joint detection method according to the present embodiment uses the slab. The seam 10 will be missed.

図５に示すように、鋳片継目部１０の前後設定範囲では、先行鋳片Ｓ１の後端部が上方に傾斜し、後行鋳片Ｓ２の先端部が下方に傾斜しているため、本実施の形態における鋳片継目部の検出方法では、後行鋳片Ｓ２の先端部を鋳片継目部として検出する。しかし、本実施の形態における鋳片継目部の検出方法によって検出された鋳片継目部と実際の鋳片継目部１０との誤差は数十ｍｍ〜１００ｍｍ程度であり、従来方法における数百ｍｍ程度の誤差に比べて充分小さいものである。   As shown in FIG. 5, in the front and rear setting range of the slab joint portion 10, the rear end portion of the preceding slab S1 is inclined upward, and the front end portion of the subsequent slab S2 is inclined downward. In the method for detecting a slab joint in the embodiment, the tip of the subsequent slab S2 is detected as a slab joint. However, the error between the slab seam detected by the slab seam detection method in the present embodiment and the actual slab seam 10 is about several tens to 100 mm, which is about several hundred mm in the conventional method. This is sufficiently small compared to the above error.

［第２の実施の形態］
本発明の第２の実施の形態に係る異鋼種連続鋳造における鋳片継目部の検出方法が適用された連続鋳造設備のブロック図を図６に示す。本実施の形態における連続鋳造設備は、軽圧下装置を備えておらず、演算装置１６は切断・軽圧下制御部２２ではなく切断制御部２３を備えている点と、検出器としてインロッドセンサ２６に代えて非接触式変位計２８が切断機１２の上流側に設置されている点が第１の実施の形態と異なっている。
なお、非接触式変位計２８としては、レーザ距離計や赤外線センサなどを使用することができる。 [Second Embodiment]
FIG. 6 shows a block diagram of a continuous casting facility to which the method for detecting a slab joint in the different steel type continuous casting according to the second embodiment of the present invention is applied. The continuous casting equipment in the present embodiment does not include a light reduction device, the arithmetic device 16 includes a cutting control unit 23 instead of the cutting / light reduction control unit 22, and an in-rod sensor 26 as a detector. Instead of the first embodiment, the non-contact displacement meter 28 is installed on the upstream side of the cutting machine 12.
As the non-contact type displacement meter 28, a laser distance meter, an infrared sensor, or the like can be used.

本実施の形態における鋳片継目部の検出方法では、非接触式変位計２８によって測定された鋳片上面の高さｈｉが演算装置１６の継目検出部１８に出力される。継目検出部１８では、継目トラッキング部１７によるトラッキングデータと非接触式変位計２８の出力信号に基づいて鋳片継目部１０の位置を検出する。
継目検出部１８によって検出された鋳片継目部１０の正確な位置は、継目トラッキング部１７にフィードバックされ、トラッキングデータの補正が行われる。補正されたトラッキングデータは切断制御部２３に出力され、切断制御部２３は、補正されたトラッキングデータに基づいて切断機１２に対して切断指令を発する。 In the method for detecting a slab joint in the present embodiment, the height h i of the slab upper surface measured by the non-contact displacement meter 28 is output to the seam detector 18 of the arithmetic device 16. The seam detection unit 18 detects the position of the slab seam 10 based on the tracking data from the seam tracking unit 17 and the output signal of the non-contact displacement meter 28.
The accurate position of the slab joint 10 detected by the joint detector 18 is fed back to the seam tracking unit 17 to correct the tracking data. The corrected tracking data is output to the cutting control unit 23, and the cutting control unit 23 issues a cutting command to the cutting machine 12 based on the corrected tracking data.

以上、本発明の実施の形態について説明してきたが、本発明は何ら上記した実施の形態に記載の構成に限定されるものではなく、特許請求の範囲に記載されている事項の範囲内で考えられるその他の実施の形態や変形例も含むものである。例えば、上記実施の形態における鋳片継目部の検出アルゴリズムでは、鋳片上面の高さｈｉが鋳片上面の最高高さｈＭＡＸより設定値α以上小さいとき、鋳片上面の高さｈｉの位置を鋳片継目部と判定しているが、鋳片上面の高さｈｉが鋳片上面の最高高さｈＭＡＸより設定値α以上小さい箇所が複数回連続したとき、当該位置を鋳片継目部と判定してもよい。 Although the embodiments of the present invention have been described above, the present invention is not limited to the configurations described in the above-described embodiments, and is considered within the scope of the matters described in the claims. Other embodiments and modifications are also included. For example, in the detection algorithm of the slab joint in the above embodiment, when the height h i of the slab upper surface is smaller than the maximum height h MAX of the slab upper surface by a set value α or more, the height h i of the slab upper surface. The position of the slab joint is determined as a slab joint. However, when a portion where the height h i of the upper surface of the slab is smaller than the maximum height h MAX of the upper surface of the slab by a set value α is continued a plurality of times, the position is You may determine with a one-piece joint part.

１０：鋳片継目部、１１：鋳型、１２：切断機、１３：測長ロール、１４：パルスジェネレータ、１５、１６：演算装置、１７：継目トラッキング部、１８：継目検出部、１９：記憶部（記憶手段）、２０：仕切り金物、２１：割れ目、２２：切断・軽圧下制御部、２３：切断制御部、２４：軽圧下装置、２５：昇降ロールシリンダ、２６：インロッドセンサ、２７：軽圧下ロール、２８：非接触式変位計、Ｓ：鋳片、Ｓ１：先行鋳片、Ｓ２：後行鋳片 10: slab joint part, 11: mold, 12: cutting machine, 13: length measuring roll, 14: pulse generator, 15, 16: arithmetic unit, 17: seam tracking part, 18: seam detection part, 19: storage part (Memory means), 20: partition hardware, 21: crack, 22: cutting / light reduction control unit, 23: cutting control unit, 24: light reduction device, 25: lifting roll cylinder, 26: in-rod sensor, 27: light Rolling roll, 28: Non-contact displacement meter, S: Cast slab, S1: Pre-slab slab, S2: Subsequent slab

Claims (3)

異鋼種連続鋳造における鋳片継目部の位置を測長ロールでトラッキングして鋳片の切断位置を決定する方法において、
前記測長ロールによってトラッキングされた鋳片継目部の前後設定範囲について、前記測長ロールの下流側に設置した検出器により、該検出器による測定開始点からの鋳片上面の高さｈｉを一定時間間隔で測定して、記憶手段に記憶されている前記鋳片上面の最高高さｈＭＡＸ （初期値＝ゼロ）と比較し、
前記鋳片上面の高さｈｉ ＞前記鋳片上面の最高高さｈＭＡＸ のとき、前記鋳片上面の高さｈｉを前記鋳片上面の最高高さｈＭＡＸとして前記記憶手段に記憶し、
前記鋳片上面の高さｈｉ ≦前記鋳片上面の最高高さｈＭＡＸ −設定値αのとき、前記鋳片上面の高さｈｉの位置を鋳片継目部と判定し、
前記鋳片上面の高さｈ ｉ ≦前記鋳片上面の最高高さｈ ＭＡＸ 、かつ前記鋳片上面の高さｈ ｉ ＞前記鋳片上面の最高高さｈ ＭＡＸ −設定値αのとき、前記鋳片上面の高さｈ ｉ の位置は鋳片継目部ではなく鋳片表面の凹凸であると判定することを特徴とする異鋼種連続鋳造における鋳片継目部の検出方法。 In the method of determining the cutting position of the slab by tracking the position of the slab joint in different steel type continuous casting with a length measuring roll,
About the front and rear set range of the slab seam tracked by the length measuring roll, the height h i of the upper surface of the slab from the measurement start point by the detector is set by a detector installed on the downstream side of the length measuring roll. Measured at regular time intervals and compared with the maximum height h MAX (initial value = zero) of the upper surface of the slab stored in the storage means,
When the height h i of the upper surface of the slab > the maximum height h MAX of the upper surface of the slab, the height h i of the upper surface of the slab is stored in the storage means as the maximum height h MAX of the upper surface of the slab. ,
Maximum height h MAX height h i ≦ the slab top surface of the slab top surface - when the set value alpha, the position of the height h i of the slab top surface determines that slab seam portion,
The slab top surface of the height h i ≦ the slab up to the height h MAX of the upper surface, and the slab top surface of the height h i> maximum height h MAX of the slab top surface - when the set value alpha, the A method for detecting a slab joint in continuous casting of different steel types, wherein the position of the height h i on the upper surface of the slab is determined not to be a slab joint but an uneven surface of the slab surface . 請求項１記載の異鋼種連続鋳造における鋳片継目部の検出方法において、前記検出器が、前記鋳片を圧下する昇降ロールシリンダに内蔵されたインロッドセンサであることを特徴とする異鋼種連続鋳造における鋳片継目部の検出方法。   2. The method for detecting a slab joint in continuous casting of different steel types according to claim 1, wherein the detector is an in-rod sensor built in a lifting roll cylinder that squeezes down the slab. A method for detecting a slab joint in casting. 請求項１記載の異鋼種連続鋳造における鋳片継目部の検出方法において、前記検出器が、非接触式変位計であることを特徴とする異鋼種連続鋳造における鋳片継目部の検出方法。   2. The method for detecting a slab joint in continuous casting of different steels according to claim 1, wherein the detector is a non-contact displacement meter.
JP2013106213A 2013-05-20 2013-05-20 Detection method of slab joint in continuous casting of different steel types Active JP6122692B2 (en)

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