JPH05285521A - Method for preventing convergence of steel strip - Google Patents
Method for preventing convergence of steel stripInfo
- Publication number
- JPH05285521A JPH05285521A JP4116842A JP11684292A JPH05285521A JP H05285521 A JPH05285521 A JP H05285521A JP 4116842 A JP4116842 A JP 4116842A JP 11684292 A JP11684292 A JP 11684292A JP H05285521 A JPH05285521 A JP H05285521A
- Authority
- JP
- Japan
- Prior art keywords
- steel strip
- rolling mill
- rolling
- threshold value
- load difference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Control Of Metal Rolling (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、熱間圧延において、
鋼ストリップの尾端部が仕上げ圧延機を通過する直前に
発生する鋼ストリップの蛇行による絞り込みを防止する
ための方法に関するものである。This invention relates to hot rolling in
The present invention relates to a method for preventing narrowing due to meandering of a steel strip that occurs immediately before a tail end portion of the steel strip passes through a finish rolling mill.
【０００２】[0002]
【従来の技術】熱間圧延の連続ラインにおいて、被圧延
材（以後、鋼ストリップで説明する）の尾端部が仕上げ
圧延機（以下、「圧延機」という）を通過する時には、
通過する直前に（いわゆる尻抜け時に）鋼ストリップの
尾端部が横流れ（以下、「蛇行」という）し、これが原
因で「絞り込み」と称される現象が発生する。絞り込み
とは、鋼ストリップの尾端部の両端縁が蛇行により圧延
機入側に設けられているサイドガイドと激しく接触し、
鋼ストリップが破断したり、鋼ストリップが２重、３重
と重なった状態となり、このように折れ込んだ状態で圧
延されることにより圧延機の圧延ロールを疵付け、次の
鋼ストリップの圧延が困難となるような現象をいう。こ
の現象は、特に、厚さ1.2mm 程度、幅1200mm程度の薄物
広幅材の熱間圧延においてしばしば発生する。2. Description of the Related Art In a continuous line of hot rolling, when the tail end of a material to be rolled (hereinafter described as steel strip) passes through a finish rolling mill (hereinafter referred to as "rolling mill"),
The tail end portion of the steel strip laterally flows (hereinafter referred to as “meandering”) immediately before passing (so-called trailing edge), and this causes a phenomenon called “narrowing”. Narrowing means that both end edges of the tail end portion of the steel strip violently contact with side guides provided on the rolling mill entrance side due to meandering,
The steel strip breaks or the steel strip becomes doubled or tripled, and when rolled in such a folded state, the rolling roll of the rolling mill is flawed and the next steel strip is rolled. A phenomenon that makes it difficult. This phenomenon often occurs especially in the hot rolling of a wide thin material having a thickness of about 1.2 mm and a width of about 1200 mm.
【０００３】[0003]
【発明が解決しようとする課題】鋼ストリップの尻抜け
時の絞り込みを防止するために、従来から、圧延機の圧
延ロールの左右の荷重差（以下、「荷重差」という）を
検出し、この荷重差の変動を蛇行とみなし、その検出値
から圧延ロールの左右のレベリング差の制御を行なうこ
とにより、蛇行を防止する方法が行われている。しかし
ながら、圧延ロールの左右の荷重差は、鋼ストリップの
蛇行以外にも、圧延荷重の変動、バックアップロールの
キーの影響、あるいは、圧延ロールの偏芯等の原因によ
っても変動するため、レベリング差制御のゲイン（以
下、「ゲイン」という）を低くせざるを得なかった。そ
のため、鋼ストリップ尾端部の蛇行に対する抑制効果は
小さく、従来方法では絞り込みの防止効果はあまり高く
なかった。In order to prevent the steel strip from being narrowed when slipping out of the tail, a load difference between the left and right of a rolling roll of a rolling mill (hereinafter referred to as "load difference") is conventionally detected. A method of preventing the meandering is performed by regarding the fluctuation of the load difference as meandering and controlling the leveling difference between the left and right of the rolling roll based on the detected value. However, the load difference between the left and right of the rolling rolls fluctuates not only in the meandering of the steel strip but also due to fluctuations in the rolling load, the influence of the key of the backup roll, or eccentricity of the rolling rolls. I had no choice but to lower the gain (hereinafter referred to as "gain"). Therefore, the effect of suppressing the meandering of the tail end portion of the steel strip is small, and the effect of preventing narrowing is not so high in the conventional method.
【０００４】従って、この発明の目的は、熱間圧延にお
いて、仕上げ圧延機を通過する直前における鋼ストリッ
プの尾端部の蛇行を制御して、絞り込みを防止すること
ができる鋼ストリップの絞り込み防止方法を提供するこ
とにある。Therefore, an object of the present invention is to prevent narrowing of steel strip in hot rolling by controlling meandering of the tail end portion of the steel strip just before passing through a finish rolling mill to prevent narrowing. To provide.
【０００５】[0005]
【課題を解決するための手段】我々は、上述の課題を解
決するために鋭意研究を重ねた。その結果、圧延機の入
側に、鋼ストリップの幅方向に移動自在のサイドガイド
を設け、尻抜け時に鋼ストリップの尾端部が蛇行したら
遅滞なくサイドガイドの幅を拡げれば、サイドガイドと
鋼ストリップの端縁とが接触せず、絞り込みも発生しな
いことを知見した。[Means for Solving the Problems] We have conducted extensive studies to solve the above problems. As a result, on the entrance side of the rolling mill, a side guide that is movable in the width direction of the steel strip is provided, and if the tail end of the steel strip meanders when slipping out, the side guide can be widened without delay without delay. It was found that the edge of the steel strip did not come into contact with the steel strip and no narrowing occurred.
【０００６】この発明は、上述の知見に基づいてなされ
たものであって、圧延機の入側に鋼ストリップの幅方向
に移動自在のサイドガイドを備え、圧延機の圧延ロール
の左右の荷重差の検出値と比較するための閾値を設定
し、移動する鋼ストリップの尾端部が圧延機を通り抜け
るときに圧延機の圧延ロールの左右の荷重差を検出し且
つその検出値と前記閾値とを比較し、前記荷重差の検出
値が前記閾値を超えたときにのみ前記サイドガイドの幅
を拡げることに特徴を有するものである。The present invention has been made on the basis of the above-mentioned findings, and is provided with a side guide movable on the entrance side of the rolling mill in the width direction of the steel strip, and a load difference between left and right rolling rolls of the rolling mill. Set a threshold value for comparison with the detection value, when the tail end of the moving steel strip passes through the rolling mill, detects the load difference between the left and right of the rolling rolls of the rolling mill and the detected value and the threshold value. In comparison, the width of the side guide is widened only when the detected value of the load difference exceeds the threshold value.
【０００７】[0007]
【作用】鋼ストリップの尾端部の尻抜け時の蛇行により
発生する圧延ロールの左右の荷重差の大きな変動にのみ
着目する。圧延ロールの左右の荷重差（以下、「荷重
差」という）の大きな変動を蛇行とみなし、荷重差の検
出値と比較する一定の値（閾値）を予め設定する。移動
する鋼ストリップの尾端部が圧延機を通り抜ける直前か
ら通り抜け直後までの間の時間において、荷重差の検出
値と閾値とを比較しながら圧延する。そして、荷重差の
検出値が閾値を超えた時にのみサイドガイドの幅を拡げ
る。かくして、蛇行した鋼ストリップの端縁とサイドガ
イドとの接触が回避され、そして、絞り込みが防止され
る。[Function] Only the large fluctuation of the load difference between the left and right of the rolling roll, which is caused by meandering when the tail end of the steel strip is slipped off, is focused on. A large variation in the load difference between the left and right of the rolling roll (hereinafter referred to as “load difference”) is regarded as meandering, and a constant value (threshold value) to be compared with the detected value of the load difference is set in advance. Rolling is performed while comparing the detected value of the load difference with the threshold value during the time from immediately before the tail end of the moving steel strip passes through the rolling mill to immediately after it passes through the rolling mill. Then, the width of the side guide is expanded only when the detected value of the load difference exceeds the threshold value. Thus, contact between the edges of the meandering steel strip and the side guides is avoided and squeezing is prevented.
【０００８】閾値の決定方法は、下記の通り、、の
２方式ある。 テーブル方式 あらかじめ蛇行以外で発生する荷重差の変動を各圧延機
毎に、鋼ストリップのサイズ、鋼種等別に調査し、閾値
をテーブルする。そして、実際の圧延する鋼ストリップ
の種類と適合したテーブルから閾値を決定する。 自動決定方式 図２は閾値の決定方式を説明するグラフである。 閾値上限＝ａ＋α1 トン 閾値下限＝ｂ−α2 トン ａは閾値決定範囲での最大荷重差 ｂは閾値決定範囲での最小荷重差 α1 、α2 は調整代で下式による。 α1 ＝（ａ−ｂ）×ｘ α2 ＝（ａ−ｂ）×ｙ ｘとｙは通常１以下となる（ケースバイケース）。There are two methods of determining the threshold, as follows. Table method The variation of the load difference that occurs other than meandering is previously investigated for each rolling mill by steel strip size, steel type, etc., and the threshold value is tabulated. Then, the threshold value is determined from a table that matches the type of steel strip to be actually rolled. Automatic Determination Method FIG. 2 is a graph for explaining the threshold determination method. Threshold upper limit = a + α 1 ton Threshold lower limit = b−α 2 ton a is the maximum load difference in the threshold determination range b is the minimum load difference in the threshold determination range α 1 and α 2 are adjustment allowances according to the following formula. α 1 = (ab) × x α 2 = (ab) × y x and y are usually 1 or less (case by case).
【０００９】[0009]
【実施例】図１はこの発明の方法に用いる仕上げ圧延機
の１つのスタンドの１実施態様を示す概略平面図であ
る。図１に示すように、圧延機１の入側には、サイドガ
イド３が設けられている。サイドガイド３は鋼ストリッ
プ４の幅方向に移動自在である。２は圧延機１の圧延ロ
ールであり、図中矢印は鋼ストリップ４の移動方向を示
す。この発明の方法によって、鋼ストリップの尻抜け時
の蛇行制御を行った。荷重差の検出値と比較するための
閾値を予め設定した。そして、鋼ストリップ４の尾端部
が圧延機１を通過する直前から通過するまでの間の時
間、サイドガイド３の幅を狭くして鋼ストリップ４を拘
束し、荷重差の検出およびその検出値と閾値との比較を
行ない、荷重差の検出値が閾値を超えたときにのみサイ
ドガイド３の幅を拡げた。1 is a schematic plan view showing one embodiment of one stand of a finish rolling mill used in the method of the present invention. As shown in FIG. 1, a side guide 3 is provided on the entrance side of the rolling mill 1. The side guide 3 is movable in the width direction of the steel strip 4. Reference numeral 2 denotes a rolling roll of the rolling mill 1, and the arrow in the drawing indicates the moving direction of the steel strip 4. By the method of the present invention, the meandering control at the time of slipping out of the steel strip was performed. A threshold value for comparison with the detected value of the load difference was set in advance. Then, the width of the side guide 3 is narrowed to restrain the steel strip 4 for a period of time from immediately before the tail end portion of the steel strip 4 passes through the rolling mill 1 to when it passes, and the steel strip 4 is constrained to detect the load difference and its detected value. Was compared with the threshold value, and the width of the side guide 3 was expanded only when the detected value of the load difference exceeded the threshold value.
【００１０】実施例によれば、鋼ストリップ尾端部の絞
り込みは発生しなかった。即ち、鋼ストリップが蛇行し
ないときは、荷重差が閾値を超えず、サイドガイドの幅
は拡がらなかった。そして、鋼ストリップが蛇行して荷
重差が閾値を超えたときにのみサイドガイドの幅が拡が
り、鋼ストリップの端縁とサイドガイドとの接触が回避
された。かくして、絞り込みの発生はなかった。According to the examples, no narrowing of the tail end of the steel strip occurred. That is, when the steel strip did not meander, the load difference did not exceed the threshold value and the width of the side guide did not expand. Then, the width of the side guide widened only when the steel strip meandered and the load difference exceeded the threshold value, and contact between the edge of the steel strip and the side guide was avoided. Thus, there was no narrowing down.
【００１１】[0011]
【発明の効果】以上説明したように、この発明によれ
ば、熱間圧延における、鋼ストリップの尻抜け時に発生
する絞り込みを防止することができる、鋼ストリップの
絞り込み防止方法を得ることができ、かくして、工業上
有用な効果が得られる。As described above, according to the present invention, it is possible to obtain a steel strip narrowing-preventing method capable of preventing the narrowing that occurs when the steel strip slips out during hot rolling. Thus, industrially useful effects can be obtained.
【図１】この発明の方法に用いる仕上げ圧延機の１つの
スタンドの１実施態様を示す概略平面図FIG. 1 is a schematic plan view showing one embodiment of one stand of a finish rolling mill used in the method of the present invention.
【図２】閾値決定方式を説明するグラフ。FIG. 2 is a graph illustrating a threshold value determination method.
１ 圧延機 ２ 圧延ロール ３ サイドガイド ４ 鋼ストリップ。 1 rolling mill 2 rolling rolls 3 side guides 4 steel strip.
Claims (1)
に移動自在のサイドガイドを備え、圧延機の圧延ロール
の左右の荷重差の検出値と比較するための閾値を設定
し、移動する鋼ストリップの尾端部が圧延機を通り抜け
るときに圧延機の圧延ロールの左右の荷重差を検出し且
つその検出値と前記閾値とを比較し、前記荷重差の検出
値が前記閾値を超えたときにのみ前記サイドガイドの幅
を拡げることを特徴とする熱間圧延における鋼ストリッ
プの絞り込み防止方法。1. A side guide that is movable in the width direction of the steel strip is provided on the entrance side of the rolling mill, and a threshold value for comparing with a detection value of a load difference between left and right of a rolling roll of the rolling mill is set and moved. When the tail end of the steel strip passes through the rolling mill, the load difference between the left and right of the rolling rolls of the rolling mill is detected and the detected value is compared with the threshold value, and the detected value of the load difference exceeds the threshold value. A method for preventing narrowing of a steel strip in hot rolling, wherein the width of the side guide is expanded only occasionally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4116842A JPH05285521A (en) | 1992-04-09 | 1992-04-09 | Method for preventing convergence of steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4116842A JPH05285521A (en) | 1992-04-09 | 1992-04-09 | Method for preventing convergence of steel strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05285521A true JPH05285521A (en) | 1993-11-02 |
Family
ID=14696980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4116842A Pending JPH05285521A (en) | 1992-04-09 | 1992-04-09 | Method for preventing convergence of steel strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05285521A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013112831A (en) * | 2011-11-25 | 2013-06-10 | Jfe Steel Corp | Method for continuous vacuum treatment of metal strip |
| US8616034B2 (en) | 2009-12-29 | 2013-12-31 | Sms Siemag Aktiengesellschaft | Method for controlling side guides of a metal strip |
-
1992
- 1992-04-09 JP JP4116842A patent/JPH05285521A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8616034B2 (en) | 2009-12-29 | 2013-12-31 | Sms Siemag Aktiengesellschaft | Method for controlling side guides of a metal strip |
| JP2013112831A (en) * | 2011-11-25 | 2013-06-10 | Jfe Steel Corp | Method for continuous vacuum treatment of metal strip |
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