JP2019181483A - Rolling control method and rolling control device for hot finish rolling - Google Patents
Rolling control method and rolling control device for hot finish rolling Download PDFInfo
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本発明は、熱間仕上圧延の圧延制御方法および圧延制御装置に関する。本発明は、特に、熱間仕上圧延において、仕上圧延機（仕上ミル）内の張力を制御する圧延スタンド間に設置されたルーパが異常となった時の、圧延制御方法に関するものである。 The present invention relates to a rolling control method and a rolling control device for hot finish rolling. In particular, the present invention relates to a rolling control method when a looper installed between rolling stands for controlling tension in a finishing mill (finishing mill) becomes abnormal in hot finish rolling.
熱間仕上圧延機のスタンド間の圧延材にかかる張力は、過大になると板切れ、逆に過小になると板の蛇行を発生させるため、適切な値で安定させる必要のある、重要なパラメータである。 The tension applied to the rolled material between the stands of the hot finish rolling mill is an important parameter that needs to be stabilized at an appropriate value because it causes the plate to break when it is excessive, and conversely, when it becomes too small, the plate meanders. .
従来、熱間仕上圧延機では、圧延スタンド間にルーパを設置し、これを用いて張力制御を実施している（例えば特許文献１〜３参照）。 Conventionally, in a hot finish rolling mill, a looper is installed between rolling stands, and tension control is performed using this (for example, refer to patent documents 1 to 3).
具体的には、圧延スタンド間に設置したルーパを一定範囲の高さまで上昇させて圧延材に押し当てて当該範囲に保持したまま、ルーパトルク実測値から張力実績値を求め、それが張力目標値と一致するように、スタンド間の圧延材長さを調整するための前段側圧延スタンド（ルーパの上流側に位置する圧延スタンド）の主機速度修正を行う。すなわち、圧延スタンド間の圧延材の張力を低くするには、前段側圧延スタンドの主機速度を上げる修正を行ってスタンド間の圧延材長さを長くし、逆に、圧延スタンド間の圧延材の張力を高くするには、前段側圧延スタンドの主機速度を下げる修正を行ってスタンド間の圧延材長さを短くする調整を行う。このときの前段側圧延スタンドの主機速度の修正量をルーパサクセという。 Specifically, the actual tension value is obtained from the measured looper torque while raising the looper installed between the rolling stands to a certain range of height and pressing it against the rolled material, and holding it in that range. In order to match, the main machine speed correction of the pre-stage side rolling stand (the rolling stand located on the upstream side of the looper) for adjusting the length of the rolled material between the stands is performed. In other words, in order to reduce the tension of the rolling material between the rolling stands, the length of the rolling material between the stands is increased by correcting the main machine speed of the preceding rolling stand to increase the length of the rolling material between the stands. In order to increase the tension, correction is performed to reduce the main machine speed of the preceding-stage rolling stand, and adjustment is performed to shorten the length of the rolled material between the stands. The amount of correction of the main machine speed of the preceding-stage rolling stand at this time is called a looper success.
圧延中に、ルーパモータ、減速機、駆動ドライブ装置の故障などによりルーパに異常が発生すると、上記の張力制御が困難になる。このような場合、張力乱れによる破断、絞り、蛇行などの通板トラブルのリスクが高まるため、圧延機を急速停止させ圧延を停止させることがある。 If an abnormality occurs in the looper during rolling due to a failure of the looper motor, speed reducer, or drive drive device, the above tension control becomes difficult. In such a case, the risk of sheet troubles such as breakage due to tension disturbance, drawing, and meandering increases, so the rolling mill may be stopped rapidly to stop rolling.
しかし、張力制御には、上述のルーパサクセの他に、板厚変動に伴い前段側圧延スタンドの主機速度変化を補償する速度修正量（前記速度修正の速度修正量をマスフローサクセという）、オペレータの手介入による操作に基づく前段側圧延スタンドの主機速度の修正量（前記速度修正の速度修正量を手介サクセという）などがあるため、張力制御におけるルーパサクセの寄与が小さな材料であれば、ルーパによる速度修正をしなくても、すなわちルーパを使わないルーパレス制御により前述のトラブルなく通板できる可能性がある。従来、ルーパが故障するなどルーパに異常が発生した際に、圧延を中止するか、ルーパレス制御に切り替えて圧延継続するかはオペレータの判断に委ねられていた。 However, in tension control, in addition to the above-mentioned looper success, a speed correction amount that compensates for a change in the main machine speed of the preceding rolling stand in accordance with the plate thickness variation (the speed correction amount of the speed correction is referred to as mass flow success) Since there is a correction amount of the main machine speed of the former rolling stand based on the operation by intervention (the speed correction amount of the speed correction is referred to as manual success), if the contribution of the looper success in the tension control is small, the speed by the looper There is a possibility that the plate can be passed without the above-mentioned trouble by the looperless control without using the looper without correction. Conventionally, when an abnormality occurs in the looper, such as when the looper breaks down, it has been left to the operator to decide whether to stop rolling or to switch to looperless control and continue rolling.
しかしながら、ルーパを使わずに圧延が継続可能か否かをオペレータが即座に判断することは難しく、圧延が継続可能であるにもかかわらず圧延中止して生産ロスが発生したり、逆に、圧延を中止すべきなのにその判断が遅れて、破断、絞り、蛇行等の通板トラブルの被害が拡大するといったリスクがある。 However, it is difficult for the operator to immediately determine whether the rolling can be continued without using a looper. Even though the rolling can be continued, the rolling is stopped and a production loss occurs. However, there is a risk that the judgment will be delayed, and the damage caused by troubles such as breakage, squeezing and meandering will increase.
本発明は、圧延材の熱間仕上圧延において、圧延スタンド間に設置したルーパに異常が発生した際に、ルーパによる前段側圧延スタンドの主機速度の修正が必要か否かを判断できて、ルーパレス制御に切り替えて圧延を継続するか、または、圧延を中止するかを自動で判断する熱間仕上圧延の圧延制御方法および圧延制御装置を提供することを目的とする。 In the hot finish rolling of a rolled material, when an abnormality occurs in a looper installed between rolling stands, it is possible to determine whether or not the main machine speed of the preceding rolling side stand needs to be corrected by the looper. It is an object of the present invention to provide a hot finishing rolling control method and a rolling control device that automatically determine whether to switch to control and continue rolling or to cancel rolling.
本発明は前記課題を解決するために、以下の手段をとったものである。すなわち、
［１］熱間仕上圧延機の圧延スタンド間に水平面からの角度を一定の範囲に制御して設置されて前記圧延スタンド間の圧延材に押し当てられたルーパを押し下げようとするルーパトルクに基づき、前記ルーパの上流側に位置する前段側圧延スタンドの主機速度を修正して前記圧延スタンド間の圧延材の張力制御を行う熱間仕上圧延の圧延制御方法であって、
圧延材の圧延開始後、前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正量であるルーパサクセを求め、当該ルーパサクセの絶対値が最大か判断して当該最大値を記憶し、
ルーパ故障自動診断システムからのルーパ異常信号の有無を判定し、これらを所定時間間隔ごと又は連続して求め、
ルーパに異常が発生したと判断された際に、前記ルーパサクセ絶対値の最大値が所定の閾値Ｘ以下の場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正効果が小さいと判断して、ルーパレス制御に切り替えて前記圧延材の圧延を継続し、前記ルーパサクセ絶対値の最大値が所定の閾値Ｘを超えた場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正が必要と判断して、前記圧延材の圧延を中止することを特徴とする、熱間仕上圧延の圧延制御方法。
［２］熱間仕上圧延機の圧延スタンド間に水平面からの角度を一定の範囲に制御して設置されて前記圧延スタンド間の圧延材に押し当てられたルーパを押し下げようとするルーパトルクと、圧延材の板厚変動と、オペレータの手介入による操作に基づき、前記ルーパの上流側に位置する前段側圧延スタンドの主機速度を修正して前記圧延スタンド間の圧延材の張力制御を行う熱間仕上圧延の圧延制御方法であって、
圧延材の圧延開始後、前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正量であるルーパサクセと、前記圧延材の板厚変動に基づく前記前段側圧延スタンドの主機速度の修正量であるマスフローサクセと、前記オペレータの手介入による操作に基づく前記前段側圧延スタンドの主機速度の修正量である手介サクセと、ルーパサクセとマスフローサクセと手介サクセの総和であるサクセ総和を求め、さらに前記ルーパサクセの絶対値が最大か判断し、当該最大値を示したときの前記サクセ総和に対するルーパサクセ絶対値の最大値の比の絶対値であるルーパサクセ寄与率を求めて記憶し、
ルーパ故障自動診断システムからのルーパ異常信号の有無を判定し、これらを所定時間間隔ごと又は連続して求め、
ルーパに異常が発生したと判断された際に、前記ルーパサクセ寄与率が所定の閾値Ｙ以下の場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正効果が小さいと判断して、ルーパレス制御に切り替えて前記圧延材の圧延を継続し、前記ルーパサクセ寄与率が所定の閾値Ｙを超えた場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正が必要と判断して、前記圧延材の圧延を中止することを特徴とする、熱間仕上圧延の圧延制御方法。
［３］熱間仕上圧延機の圧延スタンド間に水平面からの角度を一定の範囲に制御して設置されて前記圧延スタンド間の圧延材に押し当てられたルーパを押し下げようとするルーパトルクに基づき、前記ルーパの上流側に位置する前段側圧延スタンドの主機速度を修正して前記圧延スタンド間の圧延材の張力制御を行う熱間仕上圧延の圧延制御装置であって、
前記圧延制御装置は、
圧延材の圧延開始後、前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正量であるルーパサクセを求め、当該ルーパサクセの絶対値が最大か判断して当該最大値を記憶し、
ルーパ故障自動診断システムからのルーパ異常信号の有無を判定し、これらを所定時間間隔ごと又は連続して求め、
ルーパに異常が発生したと判断された際に、前記ルーパサクセ絶対値の最大値が所定の閾値Ｘ以下の場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正効果が小さいと判断して、ルーパレス制御に切り替えて前記圧延材の圧延を継続し、前記ルーパサクセ絶対値の最大値が所定の閾値Ｘを超えた場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正が必要と判断して、前記圧延材の圧延を中止することを特徴とする、熱間仕上圧延の圧延制御装置。
［４］熱間仕上圧延機の圧延スタンド間に水平面からの角度を一定の範囲に制御して設置されて前記圧延スタンド間の圧延材に押し当てられたルーパを押し下げようとするルーパトルクと、圧延材の板厚変動と、オペレータの手介入による操作に基づき、前記ルーパの上流側に位置する前段側圧延スタンドの主機速度を修正して前記圧延スタンド間の圧延材の張力制御を行う熱間仕上圧延の圧延制御装置であって、
前記圧延制御装置は、
圧延材の圧延開始後、前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正量であるルーパサクセと、前記圧延材の板厚変動に基づく前記前段側圧延スタンドの主機速度の修正量であるマスフローサクセと、前記オペレータの手介入による操作に基づく前記前段側圧延スタンドの主機速度の修正量である手介サクセと、ルーパサクセとマスフローサクセと手介サクセの総和であるサクセ総和を求め、さらに前記ルーパサクセの絶対値が最大か判断し、当該最大値を示したときの前記サクセ総和に対するルーパサクセ絶対値の最大値の比の絶対値であるルーパサクセ寄与率を求めて記憶し、
ルーパ故障自動診断システムからのルーパ異常信号の有無を判定し、これらを所定時間間隔ごと又は連続して求め、
ルーパに異常が発生したと判断された際に、前記ルーパサクセ寄与率が所定の閾値Ｙ以下の場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正効果が小さいと判断して、ルーパレス制御に切り替えて前記圧延材の圧延を継続し、前記ルーパサクセ寄与率が所定の閾値Ｙを超えた場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正が必要と判断して、前記圧延材の圧延を中止することを特徴とする、熱間仕上圧延の圧延制御装置。
In order to solve the above-mentioned problems, the present invention takes the following means. That is,
[1] Based on the looper torque that is installed between the rolling stands of the hot finish rolling mill while controlling the angle from the horizontal plane within a certain range and pressing down the looper pressed against the rolled material between the rolling stands, It is a rolling control method of hot finishing rolling that corrects the main machine speed of the preceding-stage rolling stand located on the upstream side of the looper and controls the tension of the rolled material between the rolling stands,
After starting the rolling of the rolled material, find the looper success that is the correction amount of the main machine speed of the front side rolling stand based on the looper torque, determine whether the absolute value of the looper succession is maximum, and store the maximum value,
Determine the presence or absence of looper abnormality signals from the looper failure automatic diagnosis system, and obtain these at predetermined time intervals or continuously,
When it is determined that an abnormality has occurred in the looper, and the maximum value of the absolute value of the looper successor is equal to or less than a predetermined threshold value X, the main speed of the main rolling speed of the preceding-stage rolling stand based on the looper torque in rolling the rolled material It is determined that the correction effect is small, and the rolling of the rolled material is continued by switching to looperless control. When the maximum value of the absolute value of the looper success exceeds a predetermined threshold value X, the looper torque in the rolling of the rolled material is determined. A rolling control method for hot finish rolling, characterized in that it is determined that correction of the main machine speed of the preceding-stage side rolling stand is necessary, and the rolling of the rolled material is stopped.
[2] Looper torque installed between the rolling stands of the hot finish rolling mill with the angle from the horizontal plane controlled within a certain range to press down the looper pressed against the rolled material between the rolling stands, and rolling Hot finishing for controlling the tension of the rolling material between the rolling stands by correcting the main machine speed of the preceding rolling stand located upstream of the looper based on the thickness variation of the material and the operation by the operator's manual intervention A rolling control method for rolling,
After starting rolling of the rolled material, a mass flow that is a correction amount of the main machine speed of the front side rolling stand based on a fluctuation of the thickness of the rolling material, and a looper success that is a correction amount of the main machine speed of the front side rolling stand based on the looper torque. A succe and a succe sum that is a sum of the main machine speed of the pre-stage rolling stand based on an operation by the operator's manual intervention, a succeeded succe, a mass flow succe, and a succeeded succe. The absolute value of is determined to be the maximum, and the looper success contribution ratio that is the absolute value of the ratio of the maximum value of the absolute value of the looper success to the sum total of the success when the maximum value is indicated is obtained and stored,
Determine the presence or absence of looper abnormality signals from the looper failure automatic diagnosis system, and obtain these at predetermined time intervals or continuously,
When it is determined that an abnormality has occurred in the looper, if the contribution ratio of the looper success is equal to or less than a predetermined threshold value Y, the main machine speed correction effect of the front-side rolling stand is based on the looper torque in rolling the rolled material. It is determined that the rolling material is switched to looperless control and rolling of the rolled material is continued. When the contribution ratio of the looper success exceeds a predetermined threshold value Y, the first-stage rolling based on the looper torque in rolling of the rolled material A rolling control method for hot finish rolling, characterized in that it is determined that the main machine speed of the stand needs to be corrected and rolling of the rolled material is stopped.
[3] Based on the looper torque that is installed between the rolling stands of the hot finish rolling mill while controlling the angle from a horizontal plane within a certain range and pressing down the looper pressed against the rolled material between the rolling stands, A rolling control device for hot finish rolling that controls the tension of the rolling material between the rolling stands by correcting the main machine speed of the preceding-stage rolling stand located on the upstream side of the looper,
The rolling control device
After starting the rolling of the rolled material, find the looper success that is the correction amount of the main machine speed of the front side rolling stand based on the looper torque, determine whether the absolute value of the looper succession is maximum, and store the maximum value,
Determine the presence or absence of looper abnormality signals from the looper failure automatic diagnosis system, and obtain these at predetermined time intervals or continuously,
When it is determined that an abnormality has occurred in the looper, and the maximum value of the absolute value of the looper successor is equal to or less than a predetermined threshold value X, the main machine speed of the preceding-stage rolling stand based on the looper torque in rolling of the rolled material is determined. It is judged that the correction effect is small, and the rolling of the rolled material is continued by switching to looperless control. When the maximum value of the absolute value of the looper success exceeds a predetermined threshold value X, the looper torque in the rolling of the rolled material A rolling control device for hot finish rolling, wherein the rolling of the rolled material is stopped when it is determined that correction of the main machine speed of the pre-stage side rolling stand is necessary.
[4] A looper torque that is installed between the rolling stands of the hot finish rolling mill while controlling the angle from a horizontal plane within a certain range and presses down the looper pressed against the rolled material between the rolling stands, and rolling Hot finishing for controlling the tension of the rolling material between the rolling stands by correcting the main machine speed of the preceding rolling stand located upstream of the looper based on the thickness variation of the material and the operation by the operator's manual intervention A rolling control device for rolling,
The rolling control device
After starting the rolling of the rolled material, the mass flow is the correction amount of the main machine speed of the front side rolling stand based on the fluctuation of the plate thickness and the looper success that is the correction amount of the main side speed of the front side rolling stand based on the looper torque. A succe and a succe sum that is a sum of the main machine speed of the pre-stage rolling stand based on an operation by the operator's manual intervention, a succeeded succe, a mass flow succe, and a succeeded succe. The absolute value of is determined to be the maximum, and the looper success contribution ratio, which is the absolute value of the ratio of the maximum value of the absolute value of the looper success to the sum of the successes when the maximum value is indicated, is stored,
Determine the presence or absence of looper abnormality signals from the looper failure automatic diagnosis system, and obtain these at predetermined time intervals or continuously,
When it is determined that an abnormality has occurred in the looper, if the contribution ratio of the looper success is equal to or less than a predetermined threshold value Y, the main machine speed correction effect of the front-side rolling stand is based on the looper torque in rolling the rolled material. It is determined that the rolling material is switched to looperless control and rolling of the rolled material is continued. When the contribution ratio of the looper success exceeds a predetermined threshold value Y, the first-stage rolling based on the looper torque in rolling of the rolled material A rolling control apparatus for hot finish rolling, wherein the rolling of the rolled material is stopped when it is determined that correction of the main machine speed of the stand is necessary.
本発明によれば、圧延材の熱間仕上圧延において、圧延スタンド間に設置したルーパに異常が発生した際に、ルーパトルクに基づく前段側圧延スタンドの主機速度の修正が必要か否かを判断できて、ルーパレス制御に切り替えて圧延を継続するか、または、圧延を中止するかを自動で判断する。
具体的には、本発明の圧延制御方法は、ルーパサクセ絶対値の最大値、または、ルーパサクセ寄与率を監視し、その大小から、ルーパを使わずに圧延継続可能かどうかを判断し、ルーパレス制御に切り替えて圧延を継続するか、または、圧延を中止するかを自動で判断する。これにより、ルーパを使わずに圧延継続できるにもかかわらず誤って圧延停止してしまうことを防ぎ、生産ロスを最小化する。一方、圧延継続不可能な状況では、オペレータ判断に比べて迅速に圧延を停止させるため、破断、絞り、蛇行などのトラブルによる被害も最小限に抑えることができる。
According to the present invention, in the hot finish rolling of a rolled material, when an abnormality occurs in the looper installed between the rolling stands, it can be determined whether or not it is necessary to correct the main machine speed of the pre-stage side rolling stand based on the looper torque. Thus, it is automatically determined whether to switch to looperless control and continue rolling or to cancel rolling.
Specifically, in the rolling control method of the present invention, the maximum value of the looper successor or the contribution ratio of the looper successor is monitored, and whether or not the rolling can be continued without using the looper is determined based on the magnitude of the looperless control. It is automatically judged whether to continue the rolling by switching or to cancel the rolling. This prevents rolling from being stopped accidentally even though rolling can be continued without using a looper, and minimizes production loss. On the other hand, in a situation where rolling cannot be continued, rolling is stopped more quickly than in the operator's judgment, so damage due to troubles such as breakage, drawing, and meandering can be minimized.
以下、本発明の一実施形態について、一例を図面を参照しながら説明する。なお、本発明で扱う圧延材は、鋼、アルミニウムや銅およびこれらの合金などの金属板である。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the rolling material handled by this invention is metal plates, such as steel, aluminum, copper, and these alloys.
図１は、熱間仕上圧延機の圧延スタンド間に設置されたルーパによる張力制御について説明する概略図である。本実施形態では、前記仕上圧延機として、複数の圧延スタンドを有するタンデム圧延機を想定している。 FIG. 1 is a schematic diagram illustrating tension control by a looper installed between rolling stands of a hot finishing mill. In the present embodiment, a tandem rolling mill having a plurality of rolling stands is assumed as the finishing mill.
図１に示すように、仕上圧延機の前段側圧延スタンド１と、後段側圧延スタンド２の間に、ルーパ３が設置されている。前段側圧延スタンド１は、圧延材４の進行方向（図中の矢印方向）でルーパ３の上流側に位置するｍ番目の圧延スタンドであり、後段側圧延スタンド２は、ルーパ３の下流側に位置するｍ＋１番目の圧延スタンドである（前記ｍは自然数）。そして、ルーパ３は、前段側圧延スタンド１と後段側圧延スタンド２のスタンド間の圧延材４を下から持ち上げ、圧延材４に押し当てる構造である。
As shown in FIG. 1, a
ルーパ３は、その高さを安定させるため、ルーパモータの角度制御によって一定範囲の角度になるよう制御されている。そして、ルーパモータのトルクから圧延材４のスタンド間張力を算出でき、それを目標値に一致させるように、ルーパサクセが計算される。上述のとおり、このルーパサクセは、前段側圧延スタンド１の主機速度の修正量である。ルーパサクセは、板厚変動に基づく前段側圧延スタンド１の速度修正量であるマスフローサクセと、オペレータの手介入による操作に基づく前段側圧延スタンド１の主機速度の修正量である手介サクセと共に、前段側圧延スタンド１の主機モータの速度制御に加算される。
In order to stabilize the height of the
次に、本発明の圧延制御方法の詳細について説明する。本発明では、ルーパに異常が発生したとき、ルーパサクセ絶対値の最大値、ルーパサクセ寄与率（ルーパサクセ絶対値が最大値を示したときのサクセ総和に対するルーパサクセ絶対値の最大値の比の絶対値）の一方若しくは両方を用いた判定条件により、圧延継続可否を判断する。 Next, details of the rolling control method of the present invention will be described. In the present invention, when an abnormality occurs in the looper, the maximum value of the absolute value of the looper success and the contribution ratio of the looper success (the absolute value of the ratio of the maximum value of the absolute value of the looper successor to the total sum of the successors when the absolute value of the looper succession shows the maximum value) Whether or not to continue rolling is determined based on the determination condition using one or both.
ルーパ制御はＰＬＣ（プログラマブルロジックコントローラ）またはその上位コンピュータ等の圧延制御装置に実装される。そのルーパ制御のくり返し計算（スキャン）回数をiとすると、各スキャンにおいてルーパサクセLSUC(i)が計算される。これを用いて、圧延開始以降のルーパサクセ絶対値の最大値LMAX(i)は、次式により求められる。 The looper control is implemented in a rolling control device such as a PLC (programmable logic controller) or its host computer. When the looper control iteration calculation (scan) count is i, a looper success LSUC (i) is calculated in each scan. Using this, the maximum value LMAX (i) of the looper successor absolute value after the start of rolling can be obtained by the following equation.
LMAX(i) = max ( LMAX(i-1), ｜LSUC(i)｜ ) ただし、LMAX(0)=0 LMAX (i) = max (LMAX (i-1), | LSUC (i) |) However, LMAX (0) = 0
圧延開始直後はルーパサクセが変動するため、i=1はルーパサクセが安定する経過時間の後に設定することが望ましい。ルーパサクセの絶対値が最大値を示すとき、または、その後にルーパサクセの絶対値の最大値が更新されたときのスキャン回数をi’とすると、マスフローサクセMFSUC(i)、手介サクセMSUC(i)を用いて、ルーパサクセ絶対値が最大のときのサクセ総和における割合であるルーパサクセ寄与率LCON(i)は、次式により得られる。 Since the looper success varies immediately after the start of rolling, it is desirable to set i = 1 after the elapsed time when the looper success is stable. When the absolute value of the looper success shows the maximum value, or when the number of scans after the maximum value of the absolute value of the looper success is updated to i ', the mass flow success MFSUC (i), the manual success MSUC (i) , The looper success contribution ratio LCON (i), which is the ratio of the successor sum when the absolute value of the looper succession is maximum, is obtained by the following equation.
LCON(i) = ｜ LSUC(i’) / ( LSUC(i’) + MFSUC(i’) + MSUC(i’) ) ｜ LCON (i) = | LSUC (i ’) / (LSUC (i’) + MFSUC (i ’) + MSUC (i’)) |
仕上圧延中、上記のルーパサクセ絶対値の最大値、ルーパサクセ寄与率を求めて記憶し、ルーパに異常が発生したとき、ルーパサクセ絶対値の最大値、または、ルーパサクセ寄与率を用いた判定条件により、圧延継続可否を判断する。 During finish rolling, the maximum value of the above-mentioned looper success value and the contribution factor of the looper success are calculated and stored, and when an abnormality occurs in the looper, the maximum value of the absolute value of the looper successor or the judgment condition using the looper success contribution factor is used for rolling. Judge whether to continue.
図２は、本発明の圧延制御方法の処理手順の一例を示すフロー図である。図２に示す圧延制御方法は、ルーパサクセ絶対値の最大値を用いた判定条件により、ルーパによる速度修正が必要か否かを判断するものである。 FIG. 2 is a flowchart showing an example of a processing procedure of the rolling control method of the present invention. The rolling control method shown in FIG. 2 determines whether or not speed correction by the looper is necessary based on a determination condition using the maximum value of the looper successor absolute value.
図２に示す圧延制御方法では、圧延制御装置は、圧延材の圧延開始後、ルーパトルクに基づく前段側圧延スタンドの主機速度の修正量であるルーパサクセを計算により求め（ステップＳ１）、前記ルーパサクセ絶対値が最大か判断し（ステップＳ２）、当該最大値を更新して記憶する（ステップＳ３）。さらに、ルーパ故障自動診断システムからのルーパ異常信号の有無を判定して（ステップＳ４）、これらステップ１からステップ４を所定時間間隔または連続してくり返す。そして、ルーパに異常が発生した際に、前記ルーパサクセ絶対値の最大値が所定の閾値Ｘ以下か判断する（ステップＳ５）。ルーパサクセ絶対値の最大値が閾値Ｘ以下の場合（ルーパサクセ絶対値の最大値≦Ｘ）には、ルーパによる速度修正効果が小さいと判断して（ステップＳ６）、ルーパレス制御に切り替えて圧延を継続する（ステップＳ７）。また、前記ルーパサクセ絶対値の最大値が所定の閾値Ｘ超の場合（ルーパサクセ絶対値の最大値＞Ｘ）には、ルーパによる速度修正が必要と判断して（ステップＳ８）、圧延を中止する（ステップＳ９）。 In the rolling control method shown in FIG. 2, the rolling control device obtains a looper success that is a correction amount of the main machine speed of the preceding-stage rolling stand based on the looper torque after starting rolling of the rolled material (step S1), and the looper successor absolute value Is updated (step S2), and the maximum value is updated and stored (step S3). Further, the presence / absence of a looper abnormality signal from the looper failure automatic diagnosis system is determined (step S4), and these steps 1 to 4 are repeated at predetermined time intervals or continuously. Then, when an abnormality occurs in the looper, it is determined whether the maximum value of the looper successor absolute value is equal to or smaller than a predetermined threshold value X (step S5). If the maximum value of the looper success absolute value is equal to or less than the threshold value X (maximum value of the looper success absolute value ≦ X), it is determined that the effect of speed correction by the looper is small (step S6), and the rolling is continued by switching to the looperless control. (Step S7). If the maximum value of the looper success absolute value exceeds a predetermined threshold X (maximum value of the looper success absolute value> X), it is determined that speed correction by the looper is necessary (step S8), and rolling is stopped ( Step S9).
これは、ルーパサクセ絶対値の最大値≦Ｘの場合には、当該圧延材の圧延においてルーパサクセの寄与が小さく、ルーパによる速度修正を推定するルーパレス制御に切り替えれば張力制御可能と判断できるためであり、ルーパサクセ絶対値の最大値＞Ｘの場合には、当該圧延材の圧延においてルーパサクセの寄与が大きく、ルーパによる速度修正を推定するルーパレス制御に切り替えても張力の推定誤差が大きくなり、張力制御不可と判断できるためである。 This is because when the maximum value of the looper successor value ≦ X, the contribution of the looper successor is small in rolling the rolled material, and it can be determined that the tension can be controlled by switching to the looperless control for estimating the speed correction by the looper. When the maximum value of the looper successor absolute value> X, the contribution of the looper successor is large in the rolling of the rolled material, and even when switching to the looperless control for estimating the speed correction by the looper, the tension estimation error becomes large, and the tension control is impossible. This is because it can be judged.
このように、ルーパサクセ絶対値の最大値を用いることで、ルーパに異常が発生した際に、当該圧延材の圧延においてルーパによる前段側圧延スタンドの主機速度の修正が必要か否かを自動で判断することができる。そして、この判断結果に応じて、その後、ルーパレス制御に切り替えるか、圧延を中止するか、圧延材に施す処理を適切に判断してその処理を実施することができる。なお、ルーパサクセ絶対値が最大か判定するステップＳ２において、ルーパサクセ絶対値の閾値をＸ以上か否かとしても良い。 In this way, by using the maximum absolute value of the looper successor, when an abnormality occurs in the looper, it is automatically determined whether or not the main machine speed of the former rolling stand by the looper needs to be corrected in rolling the rolled material. can do. And according to this judgment result, it can switch to looperless control after that, or it can cancel rolling, or it can judge appropriately the process given to a rolling material, and can implement the process. In step S2 for determining whether the absolute value of the looper successor is the maximum, the threshold value of the absolute value of the looper successor may be set to be X or more.
ここで、ルーパレス制御とは、対象としている圧延スタンド間のルーパ（本実施形態ではｍ番目とｍ＋１番目の圧延スタンド間のルーパ）の前段側圧延スタンドよりさらに前段に設置されたルーパ（例えばｍ−１番目とｍ番目の圧延スタンド間に設置されたルーパ、後段側圧延スタンドよりさらに後段に設置されたルーパ（例えばｍ＋１番目とｍ＋２番目の圧延スタンド間に設置されたルーパ）のトルクから求められる張力値を用いて補完し、対象としているｍ番目とｍ＋１番目の圧延スタンド間のルーパサクセを推定するものである。すなわち、対象としているｍ番目とｍ＋１番目の圧延スタンド間に設置したルーパに異常が生じた場合には、当該ルーパのトルクに基づくルーパサクセが得られなくなってしまうが、圧延制御装置がルーパレス制御手段を備えていれば、その代わりに上記推定したルーパサクセを用いて前段側圧延スタンド（ｍ番目の圧延スタンド）の主機速度を修正することで、圧延を継続することができる。 Here, the looper-less control is a looper (for example, m−) that is installed further upstream than the preceding rolling stand of the target looper (in this embodiment, the looper between the mth and m + 1th rolling stands). Tension obtained from the torque of the looper installed between the 1st and mth rolling stands and the looper installed further downstream than the subsequent rolling stand (for example, the looper installed between the m + 1st and m + 2 rolling stands). The value is used as a complement to estimate the looper succession between the target mth and m + 1st rolling stands, that is, the looper installed between the target mth and m + 1th rolling stands is abnormal. In such a case, a looper success based on the torque of the looper cannot be obtained. If it has a scan control unit, to modify the main engine speed of the front-side rolling stand (m-th rolling stand) using Rupasakuse that the estimated instead, it is possible to continue rolling.
図３は、本発明の圧延制御方法の他の処理手順の一例を示すフロー図である。図３に示す圧延制御方法は、ルーパサクセ寄与率を用いた判定条件により、ルーパによる速度修正が必要か否かを判断するものである。 FIG. 3 is a flowchart showing an example of another processing procedure of the rolling control method of the present invention. The rolling control method shown in FIG. 3 determines whether or not speed correction by the looper is necessary based on the determination condition using the looper success contribution rate.
図３に示す圧延制御方法では、圧延制御装置は、圧延材の圧延開始後、ルーパトルクに基づく前段側圧延スタンドの主機速度の修正量であるルーパサクセと、当該圧延材の板厚変動に基づく前段側圧延スタンドの主機速度の修正量であるマスフローサクセと、オペレータの手介入による操作に基づく前段側圧延スタンドの主機速度の修正量である手介サクセを求め（ステップＳ１１）、前記ルーパサクセとマスフローサクセと手介サクセの総和であるサクセ総和を求め（ステップＳ１２）、さらに前記ルーパサクセの絶対値が最大か判別し（ステップＳ１３）、当該最大値を示したときの前記サクセ総和に対するルーパサクセ絶対値の最大値との比の絶対値であるルーパサクセ寄与率を更新して記憶する（ステップＳ１４）。さらに、ルーパ故障自動診断システムからのルーパ異常信号の有無を判定して（ステップＳ１５）、これらステップＳ１１からステップＳ１４を所定時間間隔または連続してくり返す。そして、ルーパに異常が発生した際に、前記ルーパサクセ寄与率が所定の閾値Ｙ以下か判断する（ステップＳ１６）。ルーパサクセ寄与率が閾値Ｙ以下の場合（ルーパサクセ寄与率≦Ｙ）には、ルーパによる速度修正効果が小さいと判断して（ステップＳ１７）、ルーパレス制御に切り替えて圧延を継続する（ステップＳ１８）。また、前記ルーパサクセ寄与率が所定の閾値Ｙ超の場合（ルーパサクセ寄与率＞Ｙ）には、ルーパによる速度修正が必要と判断して（ステップＳ１９）、圧延を中止する（ステップＳ２０）。 In the rolling control method shown in FIG. 3, after the rolling of the rolled material is started, the rolling control device has a looper success that is a correction amount of the main machine speed of the preceding-stage rolling stand based on the looper torque, and the preceding-stage side based on the plate thickness variation of the rolled material. A mass flow success that is a correction amount of the main speed of the rolling stand and a manual success that is a correction amount of the main speed of the former rolling stand based on the operation by the operator's manual intervention are obtained (step S11), and the looper success and the mass flow success are determined. The sum of the successes, which is the sum of the handy successes, is obtained (step S12), and further, it is determined whether the absolute value of the looper successes is the maximum (step S13), and the maximum value of the absolute value of the looper successes with respect to the summation The looper success contribution ratio, which is the absolute value of the ratio, is updated and stored (step S14). Further, the presence / absence of a looper abnormality signal from the looper failure automatic diagnosis system is determined (step S15), and these steps S11 to S14 are repeated at predetermined time intervals or continuously. When an abnormality occurs in the looper, it is determined whether the looper success contribution rate is equal to or less than a predetermined threshold Y (step S16). When the looper success contribution rate is equal to or less than the threshold value Y (looper success contribution rate ≦ Y), it is determined that the speed correction effect by the looper is small (step S17), and switching to looperless control is continued (step S18). If the looper success contribution rate exceeds a predetermined threshold Y (looper success contribution rate> Y), it is determined that speed correction by the looper is necessary (step S19), and rolling is stopped (step S20).
これは、ルーパサクセ寄与率≦Ｙの場合には、当該圧延材の圧延においてルーパサクセの寄与が小さく、ルーパによる速度修正を推定するルーパレス制御に切り替えれば張力制御可能と判断できるためであり、ルーパサクセ寄与率＞Ｙの場合には、当該圧延材の圧延においてルーパサクセの寄与が大きく、ルーパを推定するルーパレス制御に切り替えても張力制御不可と判断できるためである。 This is because if the contribution ratio of looper success ≤ Y, the contribution of the looper success is small in rolling the rolled material, and it can be determined that the tension can be controlled by switching to the looperless control that estimates the speed correction by the looper. In the case of> Y, the contribution of the looper success is great in rolling the rolled material, and it can be determined that tension control is impossible even when switching to looperless control for estimating the looper.
このように、ルーパサクセ寄与率を用いることで、ルーパに異常が発生した際に、当該圧延材の圧延においてルーパによる前段側圧延スタンドの主機速度の修正が必要か否かを自動で判断することができる。そして、この判断結果に応じて、その後、ルーパレス制御または圧延中止の処理を適切に判断してその処理を実施することができる。
なお、ルーパサクセ寄与率と所定の閾値Ｙを比較し判断するステップ１６において、ルーパサクセ寄与率の閾値をＹ未満か否かとしても良い。
In this way, by using the looper success contribution rate, when an abnormality occurs in the looper, it is possible to automatically determine whether or not the main machine speed of the front side rolling stand by the looper needs to be corrected in rolling the rolled material. it can. Then, according to the determination result, it is possible to appropriately determine the looperless control or the rolling stop processing and then perform the processing.
It should be noted that in step 16 in which the looper success contribution rate is compared with the predetermined threshold value Y, the threshold value of the looper success contribution rate may be determined to be less than Y.
本発明の効果を確認するため、熱間仕上圧延機に組み込まれた張力制御システムを用いてシミュレーションを行った。ルーパ角度実績データ、ルーパトルク実績データ、各圧延スタンドの主機速度実績データを入力して、ルーパサクセを計算した。また、ルーパ異常を仮定して、特定圧延スタンド間のルーパにおけるルーパ角度0、ルーパサクセ0とし、当該圧延スタンド間の前段側圧延スタンドの主機速度の変化を確認した。シミュレーション結果を図４に示す。図４（ａ）はルーパサクセ絶対値の最大値≦Ｘ（所定の閾値）の場合のシミュレーション結果、図４（ｂ）はルーパサクセ絶対値の最大値＞Ｘの場合のシミュレーション結果である。 In order to confirm the effect of the present invention, a simulation was performed using a tension control system incorporated in a hot finish rolling mill. The looper angle results data, the looper torque results data, and the main machine speed results data of each rolling stand were input to calculate the looper success. Further, assuming a looper abnormality, the looper angle in the looper between the specific rolling stands was set to 0 and the looper success was set to 0, and the change in the main machine speed of the preceding rolling stand between the rolling stands was confirmed. The simulation results are shown in FIG. 4A shows a simulation result when the maximum value of the looper success absolute value ≦ X (predetermined threshold value), and FIG. 4B shows a simulation result when the maximum value of the absolute value of the looper succession> X.
ルーパ異常時（図中の縦点線部）に、ルーパ角度と、ルーパサクセがともに0になったとき、図４（ａ）では、主機速度が少し下がるが、ルーパサクセ絶対値の最大値≦Ｘであり、ルーパによる特定圧延スタンド間の前段側圧延スタンドの主機速度の修正なしで圧延可能であり、ルーパレス制御に切り替えて圧延を継続している。一方、図４（ｂ）では、ルーパサクセ絶対値の最大値＞Ｘでありルーパによる速度修正が必要なため圧延の継続は不可であり、主機速度を0にしたため、圧延中止している。これより、ルーパサクセ絶対値の最大値を監視することで、ルーパによる速度修正が必要であるか否かを自動で判断でき、その後の処理を自動で判断できることが確認できた。 When the looper angle and the looper success are both 0 when the looper is abnormal (vertical dotted line in the figure), the main engine speed is slightly reduced in FIG. 4 (a), but the maximum value of the absolute value of the looper success is X Rolling is possible without correcting the main machine speed of the preceding rolling stand between the specific rolling stands by the looper, and the rolling is continued by switching to looperless control. On the other hand, in FIG. 4B, the maximum value of the looper successor absolute value> X and the speed correction by the looper is necessary, so that the rolling cannot be continued, and the main machine speed is set to 0, so the rolling is stopped. From this, it was confirmed that by monitoring the maximum value of the absolute value of the looper successor, it is possible to automatically determine whether or not speed correction by the looper is necessary, and to automatically determine the subsequent processing.
１ 前段側圧延スタンド
２ 後段側圧延スタンド
３ ルーパ
４ 圧延材
DESCRIPTION OF SYMBOLS 1 First stage
Claims (4)
圧延材の圧延開始後、前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正量であるルーパサクセを求め、当該ルーパサクセの絶対値が最大か判断して当該最大値を記憶し、
ルーパ故障自動診断システムからのルーパ異常信号の有無を判定し、これらを所定時間間隔ごと又は連続して求め、
ルーパに異常が発生したと判断された際に、前記ルーパサクセ絶対値の最大値が所定の閾値Ｘ以下の場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正効果が小さいと判断して、ルーパレス制御に切り替えて前記圧延材の圧延を継続し、前記ルーパサクセ絶対値の最大値が所定の閾値Ｘを超えた場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正が必要と判断して、前記圧延材の圧延を中止することを特徴とする、熱間仕上圧延の圧延制御方法。 Based on the looper torque that is installed between the rolling stands of the hot finishing mill with the angle from the horizontal plane controlled within a certain range and presses the looper pressed against the rolling material between the rolling stands, It is a rolling control method of hot finish rolling that corrects the main machine speed of the preceding-stage rolling stand located on the upstream side and controls the tension of the rolled material between the rolling stands,
After starting the rolling of the rolled material, find the looper success that is the correction amount of the main machine speed of the front side rolling stand based on the looper torque, determine whether the absolute value of the looper succession is maximum, and store the maximum value,
Determine the presence or absence of looper abnormality signals from the looper failure automatic diagnosis system, and obtain these at predetermined time intervals or continuously,
When it is determined that an abnormality has occurred in the looper, and the maximum value of the absolute value of the looper successor is equal to or less than a predetermined threshold value X, the main speed of the main rolling speed of the preceding-stage rolling stand based on the looper torque in rolling the rolled material It is determined that the correction effect is small, and the rolling of the rolled material is continued by switching to looperless control. When the maximum value of the absolute value of the looper success exceeds a predetermined threshold value X, the looper torque in the rolling of the rolled material is determined. A rolling control method for hot finish rolling, characterized in that it is determined that correction of the main machine speed of the preceding-stage side rolling stand is necessary, and the rolling of the rolled material is stopped.
圧延材の圧延開始後、前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正量であるルーパサクセと、前記圧延材の板厚変動に基づく前記前段側圧延スタンドの主機速度の修正量であるマスフローサクセと、前記オペレータの手介入による操作に基づく前記前段側圧延スタンドの主機速度の修正量である手介サクセと、ルーパサクセとマスフローサクセと手介サクセの総和であるサクセ総和を求め、さらに前記ルーパサクセの絶対値が最大か判断し、当該最大値を示したときの前記サクセ総和に対するルーパサクセ絶対値の最大値の比の絶対値であるルーパサクセ寄与率を求めて記憶し、
ルーパ故障自動診断システムからのルーパ異常信号の有無を判定し、これらを所定時間間隔ごと又は連続して求め、
ルーパに異常が発生したと判断された際に、前記ルーパサクセ寄与率が所定の閾値Ｙ以下の場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正効果が小さいと判断して、ルーパレス制御に切り替えて前記圧延材の圧延を継続し、前記ルーパサクセ寄与率が所定の閾値Ｙを超えた場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正が必要と判断して、前記圧延材の圧延を中止することを特徴とする、熱間仕上圧延の圧延制御方法。 A looper torque that is installed between the rolling stands of the hot finish rolling mill so that the angle from the horizontal plane is controlled within a certain range and presses down the looper pressed against the rolling material between the rolling stands, and a plate of the rolling material Rolling in hot finish rolling that controls the tension of the rolling material between the rolling stands by correcting the main machine speed of the preceding rolling stand located on the upstream side of the looper on the basis of the thickness variation and the operator's manual intervention A control method,
After starting rolling of the rolled material, a mass flow that is a correction amount of the main machine speed of the front side rolling stand based on a fluctuation of the thickness of the rolling material, and a looper success that is a correction amount of the main machine speed of the front side rolling stand based on the looper torque. A succe and a succe sum that is a sum of the main machine speed of the pre-stage rolling stand based on an operation by the operator's manual intervention, a succeeded succe, a mass flow succe, and a succeeded succe. The absolute value of is determined to be the maximum, and the looper success contribution ratio that is the absolute value of the ratio of the maximum value of the absolute value of the looper success to the sum total of the success when the maximum value is indicated is obtained and stored,
Determine the presence or absence of looper abnormality signals from the looper failure automatic diagnosis system, and obtain these at predetermined time intervals or continuously,
When it is determined that an abnormality has occurred in the looper, if the contribution ratio of the looper success is equal to or less than a predetermined threshold value Y, the main machine speed correction effect of the front-side rolling stand is based on the looper torque in rolling the rolled material. It is determined that the rolling material is switched to looperless control and rolling of the rolled material is continued. When the contribution ratio of the looper success exceeds a predetermined threshold value Y, the first-stage rolling based on the looper torque in rolling of the rolled material A rolling control method for hot finish rolling, characterized in that it is determined that the main machine speed of the stand needs to be corrected and rolling of the rolled material is stopped.
前記圧延制御装置は、
圧延材の圧延開始後、前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正量であるルーパサクセを求め、当該ルーパサクセの絶対値が最大か判断して当該最大値を記憶し、
ルーパ故障自動診断システムからのルーパ異常信号の有無を判定し、これらを所定時間間隔ごと又は連続して求め、
ルーパに異常が発生したと判断された際に、前記ルーパサクセ絶対値の最大値が所定の閾値Ｘ以下の場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正効果が小さいと判断して、ルーパレス制御に切り替えて前記圧延材の圧延を継続し、前記ルーパサクセ絶対値の最大値が所定の閾値Ｘを超えた場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正が必要と判断して、前記圧延材の圧延を中止することを特徴とする、熱間仕上圧延の圧延制御装置。 Based on the looper torque that is installed between the rolling stands of the hot finishing mill with the angle from the horizontal plane controlled within a certain range and presses the looper pressed against the rolling material between the rolling stands, A rolling control device for hot finish rolling that controls the tension of the rolling material between the rolling stands by correcting the main machine speed of the upstream rolling stand located on the upstream side,
The rolling control device
After starting the rolling of the rolled material, find the looper success that is the correction amount of the main machine speed of the front side rolling stand based on the looper torque, determine whether the absolute value of the looper succession is maximum, and store the maximum value,
Determine the presence or absence of looper abnormality signals from the looper failure automatic diagnosis system, and obtain these at predetermined time intervals or continuously,
When it is determined that an abnormality has occurred in the looper, and the maximum value of the absolute value of the looper successor is equal to or less than a predetermined threshold value X, the main speed of the main rolling speed of the preceding-stage rolling stand based on the looper torque in rolling the rolled material It is determined that the correction effect is small, and the rolling of the rolled material is continued by switching to looperless control. When the maximum value of the absolute value of the looper success exceeds a predetermined threshold value X, the looper torque in the rolling of the rolled material is determined. A rolling control device for hot finish rolling, wherein the rolling of the rolled material is stopped when it is determined that correction of the main machine speed of the pre-stage side rolling stand is necessary.
前記圧延制御装置は、
圧延材の圧延開始後、前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正量であるルーパサクセと、前記圧延材の板厚変動に基づく前記前段側圧延スタンドの主機速度の修正量であるマスフローサクセと、前記オペレータの手介入による操作に基づく前記前段側圧延スタンドの主機速度の修正量である手介サクセと、ルーパサクセとマスフローサクセと手介サクセの総和であるサクセ総和を求め、さらに前記ルーパサクセの絶対値が最大か判断し、当該最大値を示したときの前記サクセ総和に対するルーパサクセ絶対値の最大値の比の絶対値であるルーパサクセ寄与率を求めて記憶し、
ルーパ故障自動診断システムからのルーパ異常信号の有無を判定し、これらを所定時間間隔ごと又は連続して求め、
ルーパに異常が発生したと判断された際に、前記ルーパサクセ寄与率が所定の閾値Ｙ以下の場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正効果が小さいと判断して、ルーパレス制御に切り替えて前記圧延材の圧延を継続し、前記ルーパサクセ寄与率が所定の閾値Ｙを超えた場合には、当該圧延材の圧延において前記ルーパトルクに基づく前記前段側圧延スタンドの主機速度の修正が必要と判断して、前記圧延材の圧延を中止することを特徴とする、熱間仕上圧延の圧延制御装置。 A looper torque that is installed between the rolling stands of the hot finish rolling mill so that the angle from the horizontal plane is controlled within a certain range and presses down the looper pressed against the rolling material between the rolling stands, and a plate of the rolling material Rolling in hot finish rolling that controls the tension of the rolling material between the rolling stands by correcting the main machine speed of the preceding rolling stand located on the upstream side of the looper on the basis of the thickness variation and the operator's manual intervention A control device,
The rolling control device
After starting rolling of the rolled material, a mass flow that is a correction amount of the main machine speed of the front side rolling stand based on a fluctuation of the thickness of the rolling material, and a looper success that is a correction amount of the main machine speed of the front side rolling stand based on the looper torque. A succe and a succe sum that is a sum of the main machine speed of the former rolling stand based on the operation by the operator's manual intervention, a lousap succe, a mass flow succe, and a succeeding succe. The absolute value of is determined to be the maximum, and the looper success contribution ratio that is the absolute value of the ratio of the maximum value of the absolute value of the looper success to the sum total of the success when the maximum value is indicated is obtained and stored,
Determine the presence or absence of looper abnormality signals from the looper failure automatic diagnosis system, and obtain these at predetermined time intervals or continuously,
When it is determined that an abnormality has occurred in the looper, if the contribution ratio of the looper success is equal to or less than a predetermined threshold value Y, the main machine speed correction effect of the front-side rolling stand is based on the looper torque in rolling the rolled material. It is determined that the rolling material is switched to looperless control and rolling of the rolled material is continued. When the contribution ratio of the looper success exceeds a predetermined threshold value Y, the first-stage rolling based on the looper torque in rolling of the rolled material A rolling control apparatus for hot finish rolling, wherein the rolling of the rolled material is stopped when it is determined that correction of the main machine speed of the stand is necessary.
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