JP2017200699A - Control method and device of cold rolling machine - Google Patents
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- 238000005097 cold rolling Methods 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005096 rolling process Methods 0.000 claims abstract description 88
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 63
- 239000010959 steel Substances 0.000 claims abstract description 63
- 238000002845 discoloration Methods 0.000 claims abstract description 24
- 238000005554 pickling Methods 0.000 claims description 63
- 238000004140 cleaning Methods 0.000 abstract description 8
- 150000004965 peroxy acids Chemical class 0.000 description 6
- 239000007788 liquid Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Abstract
Description
本発明は、酸洗圧延連続ラインにおける冷間圧延機の制御方法および装置に関し、特に、過酸洗部の板厚制御に関するものである。 The present invention relates to a control method and apparatus for a cold rolling mill in a pickling rolling continuous line, and more particularly to control of the plate thickness of a peracid picking section.
これまで、鋼帯表面を酸洗する酸洗装置と、冷間圧延を行う冷間圧延機とを有し、鋼帯の酸洗に続いて冷間圧延を連続して行う酸洗圧延連続ラインにおける酸洗処理での過酸洗部の板厚制御技術は、例えば、特許文献１に開示されている。この技術は、急峻な板厚変動を伴う鋼板を冷間圧延機を用いて圧延する際に発生する圧延トラブル（例えば、張力浮きに起因する絞り事故など）を防止することができる冷間圧延方法を提供するものであり、その主な対象として酸洗処理での過酸洗による急峻な板厚変動部を挙げている。 Up to now, a pickling rolling continuous line that has a pickling device for pickling the surface of the steel strip and a cold rolling machine for performing cold rolling, and continuously performs cold rolling following pickling of the steel strip. For example, Patent Literature 1 discloses a technique for controlling the thickness of the peracid picked portion in the pickling treatment. This technology is a cold rolling method that can prevent rolling troubles (for example, squeezing accidents caused by tension lift, etc.) that occur when rolling steel sheets with steep sheet thickness fluctuations using a cold rolling mill. As a main target, a steep plate thickness fluctuation portion due to per-acid washing in the pickling treatment is cited.
しかし、冷間圧延機において板厚が変動する要因は、急峻な板厚変動ばかりでなく、鋼板の表面性状の変化により発生する変色などもある。 However, the factors that cause the plate thickness to change in the cold rolling mill are not only a steep plate thickness change but also a color change caused by a change in the surface properties of the steel plate.
特許文献１に開示された技術は、急峻な板厚変動を伴う過酸洗部の板厚制御には適用可能であるものの、ラインが一定時間停止した場合に生じる板厚変動を伴わず表面性状の変化により変色が生ずる過酸洗部（以後、変色部とも称する）の圧延には適切に用いることができない。 Although the technique disclosed in Patent Document 1 can be applied to the plate thickness control of the per-acid wash portion accompanied by a steep plate thickness variation, the surface property is not accompanied by the plate thickness variation generated when the line is stopped for a certain time. It cannot be used appropriately for the rolling of a per-acid pickled part (hereinafter also referred to as a discolored part) in which discoloration occurs due to the change of.
すなわち、このような変色部では、鋼板の板厚変動はほとんどないものの、鋼板の表面性状の変化に伴う摩擦係数変化により圧延荷重が変動することによって、圧延後の板厚変動が発生するという問題がある。 That is, in such a discolored portion, although there is almost no variation in the thickness of the steel plate, the variation in the rolling load due to the change in the friction coefficient accompanying the change in the surface properties of the steel plate causes a variation in the thickness after rolling. There is.
本発明は、このような従来の問題に鑑みてなされたものであり、板厚変動を伴わず表面性状の変化により変色が発生している過酸洗部の圧延において、圧延後の板厚変動を抑止することができる、酸洗圧延連続ラインにおける冷間圧延機の制御方法および装置を提供することを目的とする。 The present invention has been made in view of such a conventional problem, in the rolling of the peracid pickled portion where discoloration has occurred due to the change in surface properties without fluctuations in the plate thickness, the plate thickness variation after rolling It is an object of the present invention to provide a control method and apparatus for a cold rolling mill in a pickling rolling continuous line.
酸洗と冷間圧延が連続している酸洗圧延連続ラインでは、様々なトラブル等によりラインが停止する場合がある。ラインが停止した場合、通板している鋼板はラインから取り除かれないことも多く、その場合は酸洗部にも鋼板が取り残されることになる。 In a pickling and rolling continuous line in which pickling and cold rolling are continuous, the line may stop due to various troubles. When the line stops, the passing steel plate is often not removed from the line, and in that case, the steel plate is also left behind in the pickling section.
元々、酸洗は鋼板表面のスケールと呼ばれる酸化物を除去するために行われており、酸洗によって鋼板の板厚が大きく変動するようなことはない。酸洗は、酸洗液を鋼板にスプレーで噴射する、酸洗液に鋼板を浸漬する、などの方法で行われる。 Originally, pickling is performed to remove an oxide called scale on the surface of the steel sheet, and the thickness of the steel sheet does not vary greatly due to pickling. The pickling is performed by a method such as spraying the pickling solution onto the steel plate by spraying or immersing the steel plate in the pickling solution.
通常、何らかの理由でラインが停止した場合、過酸洗を避けるために、酸洗槽から酸洗液を抜いたり、スプレーの噴射を中止する。しかしながら、ライン停止時間が一定時間以上になると、鋼板表面が変色する場合がある。これは、鋼板表面に残ってしまった少量の酸洗液や、酸洗槽の後段に設けられたリンス槽(酸洗液を除去する設備)で一定時間滞留したことによって、鋼板表面の粗さが変わることが主な原因である。 Usually, when a line stops for some reason, in order to avoid per pickling, pickling liquid is extracted from a pickling tank, or spray injection is stopped. However, when the line stop time exceeds a certain time, the surface of the steel sheet may be discolored. This is because the surface roughness of the steel sheet is due to a small amount of pickling liquid remaining on the surface of the steel sheet and the staying in a rinsing tank (equipment for removing the pickling liquid) provided after the pickling tank. Is the main cause.
したがって、上記のような鋼板表面に変色が発生した部分は、板厚自体は大きく変わらないものの、表面の粗さが変わること等により、鋼板表面の摩擦係数が変わることになる。このような鋼板を圧延する場合、板厚の変動ではなく、摩擦係数の変化によって圧延荷重が変動する。しかし、前述の特許文献１のように、板厚変動による圧延荷重の変化だけに合わせて冷間圧延機のゲインを変更すると、板厚自体が変わっているわけではないので、変色部を所定の板厚に圧延することが出来なくなる。 Accordingly, in the portion where discoloration has occurred on the steel sheet surface as described above, although the plate thickness itself does not change greatly, the friction coefficient of the steel sheet surface changes due to the change in surface roughness or the like. When rolling such a steel plate, the rolling load varies not with the variation in the plate thickness but with the variation in the friction coefficient. However, as in the above-mentioned Patent Document 1, if the gain of the cold rolling mill is changed only in accordance with the change in the rolling load due to the change in the plate thickness, the plate thickness itself does not change. It becomes impossible to roll to plate thickness.
そこで、ラインが一定時間停止した場合、変色部の位置をあらかじめ特定しておき、ライン再起動後に変色部の位置の移動をトラッキングし、変色部が圧延機に到達したら変色部をあらかじめ設定した所定定数および制御ゲインに変更して圧延し、変色部の圧延が終了したならば通常の所定定数および制御ゲインに戻して圧延するようにすれば、鋼板全長にわたって所定の板厚に出来ると考え、本発明に想到した。 Therefore, when the line is stopped for a certain time, the position of the color changing portion is specified in advance, the movement of the color changing portion is tracked after the line is restarted, and when the color changing portion reaches the rolling mill, the color changing portion is set in advance. If the roll is changed to the constant and the control gain, and the rolling of the discolored portion is finished, it is considered that if the roll is returned to the normal predetermined constant and the control gain and rolled, a predetermined plate thickness can be obtained over the entire length of the steel plate. I came up with the invention.
本発明は上記検討によって得られたものであり、その内容は以下の通りである。 The present invention has been obtained by the above examination, and the contents thereof are as follows.
［１］ 鋼帯を酸洗する酸洗槽と前記酸洗後の鋼帯を冷間圧延する冷間圧延機とを有し、鋼帯の酸洗の後に冷間圧延を連続して行う酸洗圧延連続ラインにおける冷間圧延機の制御方法であって、
前記酸洗圧延連続ラインが一定時間以上停止した場合に鋼帯に発生した変色部の始端が前記冷間圧延機に到達した時点で、前記冷間圧延機の所定定数および制御ゲインを前記時点前の値から変更し、
前記変色部の終端が前記冷間圧延機を通過した後に、前記所定定数および制御ゲインを前記時点の前の値に復帰することを特徴とする冷間圧延機の制御方法。
［２］ 上記［１］に記載の冷間圧延機の制御方法において、
圧延荷重の実績値に基づいて圧延ロールの圧下位置を制御する制御機能と、前記冷間圧延機の出側に設置された板厚計の出力に基づいて圧延ロールの圧下位置を制御する制御機能を有し、
前記変色部の始端が前記冷間圧延機に到達した時点で、前記所定定数を前記変色部の始端が前記冷間圧延機に到達した時点の値よりも大きくする制御を行うと同時に、前記制御ゲインを前記変色部の始端が前記冷間圧延機に到達した時点の値よりも小さくするか又は０とする制御を行うことを特徴とする冷間圧延機の制御方法。
［３］ 上記［２］に記載の冷間圧延機の制御方法において、
前記変色部の終端が前記冷間圧延機を通過した後に、
前記所定定数を前記変色部の始端が前記冷間圧延機に到達する前の時点の値に戻す制御を行うと同時に、
前記制御ゲインを前記変色部の始端が前記冷間圧延機に到達する前の時点の値に戻す制御を行うことを特徴とする冷間圧延機の制御方法。
［４］ 鋼帯を酸洗する酸洗槽と前記酸洗後の鋼帯を冷間圧延する冷間圧延機とを具備し、鋼帯の酸洗の後に冷間圧延を連続して行う酸洗圧延連続ラインにおける冷間圧延機の制御装置であって、
前記酸洗圧延連続ラインが予め決められた一定時間以上停止した場合に鋼帯に発生した変色部の始端が前記冷間圧延機に到達した時点で、前記冷間圧延機の所定定数および制御ゲインを前記時点前の値から変更し、
前記変色部の終端が前記冷間圧延機を通過した後に、前記所定定数および制御ゲインを前記時点の前の値に復帰することを特徴とする冷間圧延機の制御装置。
［５］ 上記［４］に記載の冷間圧延機の制御装置において、
圧延荷重の実績値に基づいて圧延ロールの圧下位置を制御する制御機能と、前記冷間圧延機の出側に設置された板厚計の出力に基づいて圧延ロールの圧下位置を制御する制御機能を有し、
前記変色部の始端が前記冷間圧延機に到達した時点で、前記所定定数を前記変色部が前記冷間圧延機に到達した時点の先端の値よりも大きくする御を行うと同時に、
前記制御ゲインを前記変色部の始端が前記冷間圧延機に到達した時点の値よりも小さくするか又は０とする制御を行うことを特徴とする冷間圧延機の制御装置。
［６］ 上記［５］に記載の冷間圧延機の制御装置において、
前記変色部の終端が前記冷間圧延機を通過した後に、
前記所定定数を前記変色部の始端が前記冷間圧延機に到達する前の時点の値に戻す制御を行うと同時に、
前記制御ゲインを前記変色部の始端が前記冷間圧延機に到達する前の時点の値に戻す制御を行うことを特徴とする冷間圧延機の制御装置。
[1] An acid having a pickling tank for pickling a steel strip and a cold rolling mill for cold rolling the steel strip after the pickling, and continuously performing cold rolling after pickling of the steel strip A control method for a cold rolling mill in a continuous washing line,
When the start point of the discolored portion generated in the steel strip reaches the cold rolling mill when the pickling rolling continuous line is stopped for a predetermined time or longer, the predetermined constant and the control gain of the cold rolling mill are set before the time. Change from the value of
A control method for a cold rolling mill, wherein the predetermined constant and the control gain are returned to the values before the time point after the end of the color changing section has passed through the cold rolling mill.
[2] In the control method of the cold rolling mill according to [1] above,
A control function for controlling the rolling position of the rolling roll based on the actual value of the rolling load, and a control function for controlling the rolling position of the rolling roll based on the output of the thickness gauge installed on the outlet side of the cold rolling mill Have
At the time when the starting end of the color changing portion reaches the cold rolling mill, the predetermined constant is controlled to be larger than the value at the time when the starting end of the color changing portion reaches the cold rolling mill, and at the same time, the control A control method for a cold rolling mill, characterized in that the gain is controlled to be smaller or zero than the value at the time when the starting end of the color changing portion reaches the cold rolling mill.
[3] In the method for controlling a cold rolling mill according to [2] above,
After the end of the discoloration part passes through the cold rolling mill,
At the same time as performing the control to return the predetermined constant to the value before the start of the color changing portion reaches the cold rolling mill,
A control method for a cold rolling mill, wherein the control gain is controlled to return to a value at a time before the start end of the color changing portion reaches the cold rolling mill.
[4] An acid bath comprising a pickling tank for pickling a steel strip and a cold rolling mill for cold rolling the steel strip after the pickling, and performing cold rolling continuously after pickling the steel strip. A control device for a cold rolling mill in a continuous washing rolling line,
A predetermined constant and a control gain of the cold rolling mill when the start of the discolored portion generated in the steel strip reaches the cold rolling mill when the pickling rolling continuous line is stopped for a predetermined time or more. Is changed from the value before the time point,
The control device for a cold rolling mill, wherein the predetermined constant and the control gain are returned to the values before the time point after the end of the color changing section has passed through the cold rolling mill.
[5] In the cold rolling mill control apparatus according to [4] above,
A control function for controlling the rolling position of the rolling roll based on the actual value of the rolling load, and a control function for controlling the rolling position of the rolling roll based on the output of the thickness gauge installed on the outlet side of the cold rolling mill Have
At the time when the starting end of the color changing portion reaches the cold rolling mill, the predetermined constant is made larger than the value at the tip when the color changing portion reaches the cold rolling mill,
A control apparatus for a cold rolling mill, characterized in that the control gain is controlled to be smaller than a value at the time when the starting end of the color changing portion reaches the cold rolling mill or set to 0.
[6] In the control device for a cold rolling mill according to [5] above,
After the end of the discoloration part passes through the cold rolling mill,
While performing the control to return the predetermined constant to the value at the time before the start of the color changing portion reaches the cold rolling mill,
A control apparatus for a cold rolling mill, wherein the control gain is controlled to return to a value at a time before the start end of the color changing portion reaches the cold rolling mill.
本発明によれば、表面性状の変化により変色が生じた変色部を特定し、特定した変色部を圧延するときには所定定数および制御ゲインを変更するようにしたので、変色部の板厚変動を抑制することができる。 According to the present invention, since the discolored portion where the discoloration has occurred due to the change in the surface property is specified, and the specified discolored portion is rolled, the predetermined constant and the control gain are changed, so that the thickness variation of the discolored portion is suppressed. can do.
以下、図面を参照して、本発明の実施形態を説明する。図１は、本発明に係る酸洗圧延連続ラインにおける圧延制御装置の装置構成例を示す図である。図中、１０は鋼帯、１１はペイオフリール、１２は酸洗槽、１３はリンス槽、１４はトラッキング装置、１５は冷間圧延機、１６は荷重計、１７は板厚計、１８は圧下装置、および１９は制御装置をそれぞれ表す。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating an apparatus configuration example of a rolling control apparatus in a pickling rolling continuous line according to the present invention. In the figure, 10 is a steel strip, 11 is a payoff reel, 12 is a pickling tank, 13 is a rinse tank, 14 is a tracking device, 15 is a cold rolling mill, 16 is a load meter, 17 is a thickness gauge, and 18 is a reduction. Devices 19 and 19 represent control devices, respectively.
ペイオフリール１１の下流側（図では左側）には、このペイオフリール１１から払い出される鋼帯（鋼板とも称する）１０の表面に存在するスケール等を酸洗除去する酸洗槽１２が設置されており、この酸洗槽１２の下流側には、鋼帯１１の表面に残存する酸洗液を洗浄除去するリンス槽１３が設置されている。酸洗槽とリンス槽とを一体化して構成してもよい。また鋼板を乾燥させるドライヤー等の設備を設けてもよい。 On the downstream side (left side in the figure) of the payoff reel 11, a pickling tank 12 for pickling and removing scales and the like existing on the surface of a steel strip (also referred to as a steel plate) 10 paid out from the payoff reel 11 is installed. A rinsing tank 13 for cleaning and removing the pickling liquid remaining on the surface of the steel strip 11 is installed on the downstream side of the pickling tank 12. You may comprise a pickling tank and a rinse tank integrally. Moreover, you may provide facilities, such as a dryer which dries a steel plate.
リンス槽１３の下流側には、図示しないルーパーやトリム装置などを経て、鋼帯１０を所望の厚さに圧延する冷間圧延機１５が設置されており、この冷間圧延機１５の下流側には、圧延後の鋼帯をコイル状に巻き取る図示しない巻き取りリールなどの装置が設置されている。冷間圧延機１５は、４段ロールタンデム型の圧延機が用いられるが、その他の形式の圧延機でも良い。また、通常は複数のスタンドで構成されているが、図では、１番目のスタンドのみを示す。 A cold rolling mill 15 for rolling the steel strip 10 to a desired thickness is installed on the downstream side of the rinsing tank 13 via a looper or a trim device (not shown), and the downstream side of the cold rolling mill 15. Is installed with a winding reel (not shown) or the like that winds the rolled steel strip into a coil. As the cold rolling mill 15, a four-roll tandem type rolling mill is used, but other types of rolling mills may be used. Moreover, although normally comprised with several stand, in a figure, only the 1st stand is shown.
トラッキング装置１４は、ライン停止があった時に、酸洗槽１２やリンス槽１３に滞留した鋼板の変色部の始端、終端を認識し、ラインが再起動した後にその位置情報を適宜把握して、制御装置１９に送る装置である。 The tracking device 14 recognizes the start and end points of the discolored portion of the steel sheet retained in the pickling tank 12 and the rinse tank 13 when the line is stopped, and appropriately grasps the position information after the line is restarted. This is a device for sending to the control device 19.
冷間圧延機１５の圧延制御を行う制御装置１９は、荷重計１６で実測した圧延荷重の実績値に基づいて圧下装置１８で冷間圧延機１５の圧延ロール圧下位置を制御する制御機能と、冷間圧延機１５の出側に設置された板厚計１７の出力に基づいて圧下装置１８で冷間圧延機１５の圧延ロール圧下位置を制御する制御機能を有している。 The control device 19 that performs rolling control of the cold rolling mill 15 has a control function of controlling the rolling roll reduction position of the cold rolling mill 15 by the reduction device 18 based on the actual value of the rolling load actually measured by the load meter 16; Based on the output of the thickness gauge 17 installed on the outlet side of the cold rolling mill 15, it has a control function for controlling the rolling roll reduction position of the cold rolling mill 15 with the reduction device 18.
変色部の発生および特定にあたって、先ず、酸洗部でのライン停止時間が一定時間以上となったかどうかを判断する。ここで、一定時間とは、ラインが停止して酸洗槽またはリンス槽に鋼板が滞留して鋼板表面に変色が生じるまでの時間であり、実験または実績等によってあらかじめ決めておく。ライン停止時間が一定時間未満の場合は鋼板表面に変色が発生しないので、そのまま再稼動する。 In generating and specifying the discolored portion, first, it is determined whether or not the line stop time in the pickling portion is a certain time or more. Here, the fixed time is a time from when the line is stopped until the steel sheet stays in the pickling tank or the rinse tank and discoloration occurs on the surface of the steel sheet, and is determined in advance by experiments or results. If the line stop time is less than a certain time, discoloration does not occur on the surface of the steel sheet, so the operation is resumed.
そして、変色部を、酸洗槽出口又は酸洗槽出側のリンス槽出口を始端とし、酸洗槽入口を終端とする鋼板の部分とする。なお、作業員による目視判断またはカメラ等で撮影された画像を処理して変色部を特定する方法を用いるようにしてもよい。酸洗槽とリンス槽とが一体として構成されている場合は、変色部の始端はリンス槽出口になる。 And let a discoloration part be the part of the steel plate which makes the start of the pickling tank exit or the rinse tank exit of the pickling tank exit, and ends the pickling tank inlet. In addition, you may make it use the method of identifying the discoloration part by processing the image image | photographed with the visual judgment by a worker or a camera. In the case where the pickling tank and the rinsing tank are integrally formed, the starting end of the discoloration portion is the rinsing tank outlet.
変色部の始端・終端それぞれの冷間圧延機入口からの位置を記憶する。ラインの再起動とともに、鋼板のライン速度と時間から始端・終端の位置を冷間圧延機入口までトラッキングする。鋼板のライン速度とラインが再起動してからの時間で、変色部の始端、終端の位置を常に知ることが出来る。変色部の位置情報は、トラッキング装置１４でモニタされて、冷間圧延機の制御装置１９に送られる。 The positions from the cold rolling mill entrance at the start and end of the color changing portion are stored. As the line is restarted, the start and end positions are tracked from the line speed and time of the steel plate to the cold rolling mill entrance. With the line speed of the steel plate and the time after the line is restarted, it is possible to always know the positions of the start and end of the discolored part. The position information of the discoloration part is monitored by the tracking device 14 and sent to the control device 19 of the cold rolling mill.
冷間圧延機の制御装置１９は、変色部の始端が冷間圧延機入側までくると、冷間圧延機の所定定数および制御ゲインを変更し、その所定定数および制御ゲインを変色部の終端が圧延機を通過するまで維持する。そして、変色部の終端が冷間圧延機を通過すると、所定定数および制御ゲインを変色部が通過する前の値に戻し、以降通常どおり圧延を行う。 The control device 19 of the cold rolling mill changes the predetermined constant and control gain of the cold rolling mill when the start end of the color changing section reaches the cold rolling mill entrance side, and changes the predetermined constant and control gain to the end of the color changing section. Until it passes through the rolling mill. Then, when the end of the color changing portion passes through the cold rolling mill, the predetermined constant and the control gain are returned to values before the color changing portion passes, and rolling is performed as usual thereafter.
ここで、所定定数としては、冷間圧延機の等価ミル定数を挙げることができる。また制御ゲインの例としては、例えばモニタAGC制御でのゲインを挙げることができる。 Here, examples of the predetermined constant include an equivalent mill constant of a cold rolling mill. As an example of the control gain, for example, a gain in the monitor AGC control can be given.
圧延制御方法は、特に限定されるものではないが、例えば前述の等価ミル定数制御機能およびモニタAGC制御機能を用いる板厚制御では、次のように行う。 The rolling control method is not particularly limited. For example, in the plate thickness control using the above-described equivalent mill constant control function and monitor AGC control function, the rolling control method is performed as follows.
等価ミル定数制御は、ある時点での圧延荷重の実績値によって圧延ロールの圧下位置を調整する制御方法である。急峻な荷重変動に対してもすばやく追随できる特徴がある。例えば、ミル定数が一定の条件下で、ある時点での圧延荷重が大きくなれば、圧延機入り側の板厚が厚いと判断して、圧延ロールの圧下量を大きくする、という制御を行う。 The equivalent mill constant control is a control method for adjusting the rolling position of the rolling roll based on the actual value of the rolling load at a certain time. It has the feature that it can quickly follow a sudden load fluctuation. For example, if the rolling load at a certain point becomes large under a condition where the mill constant is constant, it is determined that the plate thickness on the rolling mill entrance side is thick, and the rolling roll reduction amount is increased.
しかし、圧延荷重は、板厚の変動のみで変化するわけではなく、鋼板表面の摩擦係数の影響も受ける。鋼板表面の摩擦係数は、ライン停止による変色の場合は小さくなっていることが多く、このような場合は圧延荷重が見かけ小さくなる。 However, the rolling load is not changed only by the variation of the plate thickness, but is also affected by the friction coefficient of the steel plate surface. The friction coefficient of the steel sheet surface is often small in the case of discoloration due to line stop, and in such a case, the rolling load is apparently small.
ミル定数が変わらない場合、圧延荷重が小さくなると、板厚が薄くなる。ミル定数が変わらない場合は、薄くなった板厚を所定の板厚に回復させることが困難になる。このように、圧延荷重の変動のみをモニタしてロールの圧下量を制御すると、鋼板の板厚には実際には変動がないのにロール圧下量を変えてしまい、所望の板厚を得ることができなくなる。 If the mill constant does not change, the plate thickness decreases as the rolling load decreases. When the mill constant does not change, it is difficult to recover the thin plate thickness to a predetermined plate thickness. In this way, if only the rolling load fluctuation is monitored and the roll reduction amount is controlled, the roll reduction amount is changed even though there is no actual fluctuation in the steel plate thickness, and a desired thickness is obtained. Can not be.
このような事態は、等価ミル定数を大きくすることで回避できる。変色部による鋼板表面の摩擦係数変化がもたらす荷重変動分を補償するために、等価ミル定数Ｋα［＝Ｋ／（１−α）、ここで、Ｋ：ミル定数、α：補正係数（０≦α＜１）］を変色部到達前の値より大きくすれば（実際は、補正係数αを大きくする）、荷重変動に対する適切な板厚制御が可能になる。つまり、等価ミル定数Ｋαを大きくすることによって、圧延荷重が一定になるようにする、すなわち変色部の圧延荷重が変色の無い部分と同じになるようにすることで、変色の有無にかかわらず所望の板厚を得ることができるようになる。 Such a situation can be avoided by increasing the equivalent mill constant. In order to compensate for the load variation caused by the change in the friction coefficient of the steel sheet surface due to the discolored portion, the equivalent mill constant Kα [= K / (1-α), where K: mill constant, α: correction coefficient (0 ≦ α If <1)] is made larger than the value before reaching the discolored portion (actually, the correction coefficient α is increased), it becomes possible to appropriately control the thickness with respect to the load variation. That is, by increasing the equivalent mill constant Kα, the rolling load is made constant, that is, the rolling load of the discolored portion is the same as that of the portion having no discoloration, so that it is desired regardless of the presence or absence of discoloration. Can be obtained.
モニタAGC制御は、冷間圧延機の出側に設置された板厚計の出力に基づいて圧延ロールの圧下位置を制御する制御方法である。所定間隔で実際の板厚を測定し、その板厚の変化を常にモニタしながら制御を行う。実際の板厚に基づくので、精度のよい制御が可能になる反面、応答速度が遅いことから、急峻な板厚変動があると応答が振動してしまうことがある。 The monitor AGC control is a control method for controlling the rolling position of the rolling roll based on the output of a thickness gauge installed on the exit side of the cold rolling mill. The actual plate thickness is measured at a predetermined interval, and control is performed while constantly monitoring the change in the plate thickness. Since it is based on the actual plate thickness, it is possible to control with high accuracy, but since the response speed is slow, the response may vibrate if there is a steep plate thickness variation.
本発明のように等価ミル定数制御を行うと、板厚の変動が通常よりも大きくなることがある。このような場合にモニタAGC制御を行うと、板厚がハンチングを起こす可能性がある。したがって、本発明のように等価ミル定数制御を併用する場合は、急峻な板厚変動によって生じる板厚のハンチングの影響を除くために、制御ゲインを変色部到達前の値より小さくするか又は０（無効）として、AGC制御機能を抑えるか無効化する。 When the equivalent mill constant control is performed as in the present invention, the variation of the plate thickness may be larger than usual. If monitor AGC control is performed in such a case, the plate thickness may cause hunting. Therefore, when the equivalent mill constant control is used together as in the present invention, in order to eliminate the influence of the plate thickness hunting caused by the steep plate thickness variation, the control gain is made smaller than the value before reaching the discoloration portion or 0. (Disable) to suppress or disable the AGC control function.
そして、等価ミル定数の変更とAGC制御の制御ゲインの変更を同時に行うことにより、ライン停止による変色部があっても板厚制御を適切に行うことが可能になる。 By changing the equivalent mill constant and the AGC control gain at the same time, it is possible to appropriately control the plate thickness even if there is a discoloration due to line stoppage.
なお、等価ミル定数およびモニタAGCの制御ゲインの変更量については、対象とする冷間圧延機または鋼板の種類などにより異なるので、対象ごとに適宜決めるようにすればよい。また、本発明を適用する冷間圧延機のスタンドについては、酸洗槽から一番近い位置にある＃１スタンドが最も効果的であるが、冷間圧延機が複数のスタンドを有する場合はこれに限られるものでない。 Note that the amount of change in the equivalent mill constant and the control gain of the monitor AGC varies depending on the type of target cold rolling mill or steel plate, and may be determined appropriately for each target. As for the stand of the cold rolling mill to which the present invention is applied, the # 1 stand closest to the pickling tank is the most effective, but this is the case when the cold rolling mill has a plurality of stands. It is not limited to.
そして、変色部の圧延が終了すれば、変色部の圧延終了前の制御状態に戻す。すなわち、等価ミル定数を小さくし、モニタAGCの制御ゲインを大きくして変更前の制御状態とする。このようにすることで、鋼板全長にわたって所定の板厚に圧延することが可能になる。 And if rolling of a color-change part is complete | finished, it will return to the control state before completion | finish of rolling of a color-change part. That is, the equivalent mill constant is reduced and the control gain of the monitor AGC is increased to obtain the control state before the change. By doing in this way, it becomes possible to roll to predetermined sheet thickness over the full length of a steel plate.
板厚制御における等価ミル定数制御機能とモニタAGC制御機能の割合は、対象となる冷間圧延機の性能や、鋼板の種類や板厚、板幅などの諸元等によって適宜設定される。例えば、ミル定数は圧延機の種類や構成によって異なるが、4段タンデム型の冷間圧延機の場合、ミル定数を大きくしすぎると、ロール偏心の影響等によって逆に板厚の制御が難しくなる場合があるので、通常の圧延では0.65〜0.75の範囲で設定されている。 The ratio between the equivalent mill constant control function and the monitor AGC control function in the sheet thickness control is appropriately set according to the performance of the target cold rolling mill, specifications such as the type, thickness, and width of the steel sheet. For example, the mill constant varies depending on the type and configuration of the rolling mill, but in the case of a four-stage tandem type cold rolling mill, if the mill constant is too large, it becomes difficult to control the plate thickness due to the influence of roll eccentricity. Since there is a case, it is set in the range of 0.65 to 0.75 in normal rolling.
しかし、変色部を圧延するときは、ミル定数を0.8〜0.9の範囲で適宜設定して圧延を行うことで、圧延荷重の変動を抑え、板厚の変動も抑えることが可能になる。また、モニタAGCの制御ゲインは、通常よりも低く設定し、場合によっては０とする。 However, when rolling the discolored portion, by performing rolling while appropriately setting the mill constant in the range of 0.8 to 0.9, it is possible to suppress fluctuations in rolling load and fluctuations in sheet thickness. Further, the control gain of the monitor AGC is set lower than usual, and is set to 0 in some cases.
上述した所定定数および制御ゲインは、等価ミル定数、AGC制御ゲイン以外のものを用いてもよい。 The predetermined constant and control gain described above may be other than the equivalent mill constant and AGC control gain.
なお、ライン停止時間があらかじめ決められた一定時間以下の場合は、鋼板表面の変色は軽微なことが多く、その後の圧延には大きな影響はない。したがって、ライン停止時間をモニタし、所定時間ラインが停止した場合に鋼板変色部を特定し、圧延での制御ゲインを変更するようにすれば、生産効率を落とすことなく、酸洗圧延連続ラインを稼動させることが出来る。 When the line stop time is equal to or less than a predetermined time, discoloration of the steel sheet surface is often slight and does not significantly affect the subsequent rolling. Therefore, if the line stop time is monitored, the steel plate discoloration part is specified when the line is stopped for a predetermined time, and the control gain in the rolling is changed, the pickling rolling continuous line can be formed without reducing the production efficiency. It can be operated.
本発明を酸洗圧延連続ラインに適用した結果、変色部が発生するようなライン停止があっても板厚不良が減少した。また、従来では板厚不良部を圧延後の工程で除去していたが、その作業も不要となった。その結果、ライン停止時の板厚不良発生率は平均で5％以下になり、酸洗圧延連続ライン全体での平均歩留まりも10％以上改善した。 As a result of applying the present invention to a pickling-rolling continuous line, even if there was a line stop where a discolored portion was generated, the plate thickness defect was reduced. In addition, conventionally, the defective thickness portion was removed in the process after rolling, but this operation is no longer necessary. As a result, the sheet thickness failure rate when the line stopped was 5% or less on average, and the average yield of the entire pickling rolled continuous line was also improved by 10% or more.
１０ 鋼帯
１１ ペイオフリール
１２ 酸洗槽
１３ リンス槽
１４ トラッキング装置
１５ 冷間圧延機
１６ 荷重計
１７ 板厚計
１８ 圧下装置
１９ 制御装置
DESCRIPTION OF SYMBOLS 10 Steel strip 11 Payoff reel 12 Pickling tank 13 Rinse tank 14 Tracking apparatus 15 Cold rolling mill 16 Load meter 17 Sheet thickness gauge 18 Reduction apparatus 19 Control apparatus
Claims (6)
前記酸洗圧延連続ラインが一定時間以上停止した場合に鋼帯に発生した変色部の始端が前記冷間圧延機に到達した時点で、前記冷間圧延機の所定定数および制御ゲインを前記時点前の値から変更し、
前記変色部の終端が前記冷間圧延機を通過した後に、前記所定定数および制御ゲインを前記時点の前の値に復帰することを特徴とする冷間圧延機の制御方法。 Pickling rolling continuous having a pickling tank for pickling steel strip and a cold rolling mill for cold rolling the steel strip after pickling, and continuously performing cold rolling after pickling of the steel strip A control method for a cold rolling mill in a line,
When the start point of the discolored portion generated in the steel strip reaches the cold rolling mill when the pickling rolling continuous line is stopped for a predetermined time or longer, the predetermined constant and the control gain of the cold rolling mill are set before the time. Change from the value of
A control method for a cold rolling mill, wherein the predetermined constant and the control gain are returned to the values before the time point after the end of the color changing section has passed through the cold rolling mill.
圧延荷重の実績値に基づいて圧延ロールの圧下位置を制御する制御機能と、前記冷間圧延機の出側に設置された板厚計の出力に基づいて圧延ロールの圧下位置を制御する制御機能を有し、
前記変色部の始端が前記冷間圧延機に到達した時点で、前記所定定数を前記変色部の始端が前記冷間圧延機に到達した時点の値よりも大きくする制御を行うと同時に、前記制御ゲインを前記変色部の始端が前記冷間圧延機に到達した時点の値よりも小さくするか又は０とする制御を行うことを特徴とする冷間圧延機の制御方法。 In the control method of the cold rolling mill according to claim 1,
A control function for controlling the rolling position of the rolling roll based on the actual value of the rolling load, and a control function for controlling the rolling position of the rolling roll based on the output of the thickness gauge installed on the outlet side of the cold rolling mill Have
At the time when the starting end of the color changing portion reaches the cold rolling mill, the predetermined constant is controlled to be larger than the value at the time when the starting end of the color changing portion reaches the cold rolling mill, and at the same time, the control A control method for a cold rolling mill, characterized in that the gain is controlled to be smaller or zero than the value at the time when the starting end of the color changing portion reaches the cold rolling mill.
前記変色部の終端が前記冷間圧延機を通過した後に、
前記所定定数を前記変色部の始端が前記冷間圧延機に到達する前の時点の値に戻す制御を行うと同時に、
前記制御ゲインを前記変色部の始端が前記冷間圧延機に到達する前の時点の値に戻す制御を行うことを特徴とする冷間圧延機の制御方法。 In the control method of the cold rolling mill according to claim 2,
After the end of the discoloration part passes through the cold rolling mill,
At the same time as performing the control to return the predetermined constant to the value before the start of the color changing portion reaches the cold rolling mill,
A control method for a cold rolling mill, wherein the control gain is controlled to return to a value at a time before the start end of the color changing portion reaches the cold rolling mill.
前記酸洗圧延連続ラインが予め決められた一定時間以上停止した場合に鋼帯に発生した変色部の始端が前記冷間圧延機に到達した時点で、前記冷間圧延機の所定定数および制御ゲインを前記時点前の値から変更し、
前記変色部の終端が前記冷間圧延機を通過した後に、前記所定定数および制御ゲインを前記時点の前の値に復帰することを特徴とする冷間圧延機の制御装置。 A pickling continuation comprising a pickling tank for pickling a steel strip and a cold rolling mill for cold rolling the steel strip after pickling, and continuously performing cold rolling after pickling of the steel strip A control device for a cold rolling mill in a line,
A predetermined constant and a control gain of the cold rolling mill when the start of the discolored portion generated in the steel strip reaches the cold rolling mill when the pickling rolling continuous line is stopped for a predetermined time or more. Is changed from the value before the time point,
The control device for a cold rolling mill, wherein the predetermined constant and the control gain are returned to the values before the time point after the end of the color changing section has passed through the cold rolling mill.
圧延荷重の実績値に基づいて圧延ロールの圧下位置を制御する制御機能と、前記冷間圧延機の出側に設置された板厚計の出力に基づいて圧延ロールの圧下位置を制御する制御機能を有し、
前記変色部の始端が前記冷間圧延機に到達した時点で、前記所定定数を前記変色部が前記冷間圧延機に到達した時点の先端の値よりも大きくする御を行うと同時に、
前記制御ゲインを前記変色部の始端が前記冷間圧延機に到達した時点の値よりも小さくするか又は０とする制御を行うことを特徴とする冷間圧延機の制御装置。 In the control apparatus of the cold rolling mill of Claim 4,
A control function for controlling the rolling position of the rolling roll based on the actual value of the rolling load, and a control function for controlling the rolling position of the rolling roll based on the output of the thickness gauge installed on the outlet side of the cold rolling mill Have
At the time when the starting end of the color changing portion reaches the cold rolling mill, the predetermined constant is made larger than the value at the tip when the color changing portion reaches the cold rolling mill,
A control apparatus for a cold rolling mill, characterized in that the control gain is controlled to be smaller than a value at the time when the starting end of the color changing portion reaches the cold rolling mill or set to 0.
前記変色部の終端が前記冷間圧延機を通過した後に、
前記所定定数を前記変色部の始端が前記冷間圧延機に到達する前の時点の値に戻す制御を行うと同時に、
前記制御ゲインを前記変色部の始端が前記冷間圧延機に到達する前の時点の値に戻す制御を行うことを特徴とする冷間圧延機の制御装置。 In the control apparatus of the cold rolling mill according to claim 5,
After the end of the discoloration part passes through the cold rolling mill,
At the same time as performing the control to return the predetermined constant to the value before the start of the color changing portion reaches the cold rolling mill,
A control apparatus for a cold rolling mill, wherein the control gain is controlled to return to a value at a time before the start end of the color changing portion reaches the cold rolling mill.
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| JPH06170430A (en) * | 1992-11-30 | 1994-06-21 | Nkk Corp | Method for controlling combined line including cold rolling mill |
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| CN112474816A (en) * | 2020-11-16 | 2021-03-12 | 山西太钢不锈钢股份有限公司 | Method for correcting information of steel coil on line by acid continuous rolling |
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