JPS6352963B2 - - Google Patents

Info

Publication number
JPS6352963B2
JPS6352963B2 JP57209570A JP20957082A JPS6352963B2 JP S6352963 B2 JPS6352963 B2 JP S6352963B2 JP 57209570 A JP57209570 A JP 57209570A JP 20957082 A JP20957082 A JP 20957082A JP S6352963 B2 JPS6352963 B2 JP S6352963B2
Authority
JP
Japan
Prior art keywords
speed
change
stand
changing
rolling
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.)
Expired
Application number
JP57209570A
Other languages
Japanese (ja)
Other versions
JPS59101213A (en
Inventor
Yasutaka Nawata
Hiroshi Hasegawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP57209570A priority Critical patent/JPS59101213A/en
Publication of JPS59101213A publication Critical patent/JPS59101213A/en
Publication of JPS6352963B2 publication Critical patent/JPS6352963B2/ja
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/24—Automatic variation of thickness according to a predetermined programme
    • B21B37/26—Automatic variation of thickness according to a predetermined programme for obtaining one strip having successive lengths of different constant thickness

Description

【発明の詳細な説明】 本発明は、複数のスタンドを連続して配置した
タンデム圧延機における走間スケジユール変更時
の速度と圧下位置の変更タイミングに関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the timing of changing speed and rolling position when changing the running schedule in a tandem rolling mill in which a plurality of stands are arranged in series.

近年、冷間タンデム圧延機における品質、歩留
りの向上を目的として、圧延途中での走間スケジ
ユール変更技術が要望されている。 In recent years, with the aim of improving quality and yield in cold tandem rolling mills, there has been a demand for technology for changing the running schedule during rolling.

走間スケジユール変更方案は、特願昭45−
19211、特願昭47−15646等各種の方案が公知であ
る。走間スケジユール変更時には速度及び圧下位
置を順次、次コイルのスケジユールに変更する
が、従来はサイズ変更点が各スタンドを通過する
時に速度と圧下位置を同時に変更していた。速度
の変化率はサイズ変更点でのオフゲージを最小と
するために通常の圧延機の加減速率とするのが一
般であるが、現状の圧下装置はその応答性に限界
があり、圧下位置の変更率は速度の変更率に比べ
２〜５倍程度となつている。そのため速度と圧下
位置の変更時間が異なり、圧延材に張力変動を生
じることとなる。従つて、従来は安定した走間ス
ケジユール変更を行うために、板厚の変更代に制
限を付けざるを得ないという問題があつた。 The plan to change the running schedule is a patent application filed in 1972.
Various methods are known, such as 19211 and Japanese Patent Application No. 1983-15646. When changing the running schedule, the speed and roll position are sequentially changed to the schedule of the next coil, but conventionally, the speed and roll position were changed at the same time when the size change point passed through each stand. Generally, the speed change rate is set to the acceleration/deceleration rate of a normal rolling mill in order to minimize the off-gauge at the point of size change, but current rolling equipment has a limit to its responsiveness, and it is difficult to change the rolling position. The rate is about 2 to 5 times higher than the speed change rate. Therefore, the speed and the time for changing the rolling position are different, which causes tension fluctuations in the rolled material. Therefore, in the past, there was a problem in that in order to stably change the running schedule, it was necessary to limit the amount of change in plate thickness.

また、速度変更時の張力変動を抑えるために圧
下位置の変更率に合せて速度の変更率を遅くする
ことも考えられるが速度の変更時間が長くなるこ
とにより、サイズ変更点でのオフゲージが長くな
るという問題がある。 Also, in order to suppress tension fluctuations when changing the speed, it is possible to slow down the speed change rate in accordance with the change rate of the rolling position, but as the speed change time becomes longer, the off-gauge at the size change point becomes longer. There is a problem with becoming.

本発明はかかる問題に鑑み走間スケジユール変
更時の張力変動を小さくし、大幅なサイズ変更を
行うための走間スケジユール変更方法を提供する
ものである。以下、本発明の詳細を説明する。 In view of this problem, the present invention provides a method for changing the running schedule for reducing tension fluctuations when changing the running schedule and making a large size change. The details of the present invention will be explained below.

第１図は５スタンドタンデム圧延機の圧下制御
系、速度制御系を示しており、１は圧延材、２は
圧延機、３は圧下装置、４は圧下制御装置、５は
電動機、６は速度制御装置、７はサイズ変更点の
検出装置、８はロール回転数に同期したパルス発
振器、９は検出装置７とパルス発振器８よりサイ
ズ変更点をトラツキングし各スタンド通過毎に圧
下と速度の出力タイミング信号を出力するトラツ
キング装置、１０は圧下出力タイミング信号によ
り圧下位置を変更する圧下変更装置、１１は速度
出力タイミング信号により速度を変更する速度変
更装置、１２はサイズ変更点が各スタンド通過時
の圧下と速度の変更代を計算する走間スケジユー
ル変更装置である。 Figure 1 shows the rolling control system and speed control system of a 5-stand tandem rolling mill, where 1 is the rolling material, 2 is the rolling machine, 3 is the rolling device, 4 is the rolling control device, 5 is the electric motor, and 6 is the speed. Control device, 7 is a size change point detection device, 8 is a pulse oscillator synchronized with the roll rotation speed, 9 is a size change point tracked by the detection device 7 and pulse oscillator 8, and output timing of reduction and speed each time each stand passes. 10 is a tracking device that outputs a signal; 10 is a reduction change device that changes the reduction position according to a reduction output timing signal; 11 is a speed change device that changes speed according to a speed output timing signal; 12 is a reduction in size when the size change point passes each stand. This is a running schedule changing device that calculates the speed change allowance.

走間スケジユール変更時の圧下と速度の変更タ
イミングの１例を第２図に示す。第２図でv1、
v2、……v5はサイズの変更前の速度、v1′、v2′、
……v5′はサイズ変更後の速度、s1、s2、……s5は
サイズ変更前の圧下位置、s1′、s2′、……s5′はサ
イズ変更後の圧下位置を示す。 FIG. 2 shows an example of the change timing of the reduction and speed when changing the running schedule. In Figure 2, v 1 ,
v 2 ,...v 5 is the velocity before size change, v 1 ′, v 2 ′,
……v 5 ′ is the speed after size change, s 1 , s 2 , … s 5 is the rolling position before size change, s 1 ′, s 2 ′, … s 5 ′ is rolling position after size change shows.

ここで、サイズ変更点がNo.２スタンドを通過す
る時点を例にとると、サイズ変更点がNo.２スタン
ド通過時にはNo.１スタンドの速度を次スケジユー
ルに変更することによりサイズ変更点より上流側
つまりNo.１スタンドとNo.２スタンド間が、次コイ
ルの速度比に変更される。No.１速度の変更に伴い
No.１スタンドとNo.２スタンド間の張力が変動する
が、この張力変動を吸収するためにNo.２スタンド
の圧下位置を変更する。一般的には速度変更速度
＞圧下位置変更速度であり、従来のようにNo.１ス
タンドの速度と圧下位置とを同時に変更すると速
度と圧下の変更時間の差によりNo.１スタンドとNo.
２スタンド間の張力が変動することになる。本発
明では第３図のように速度変更代（Δv1＝v1−
v1′）と圧下変更代（Δs＝s2−s2′）より速度と圧
下の変更時間を求め、サイズ変更点がNo.２スタン
ド通過時にNo.１スタンドの速度変更が半分完了す
るように、またNo.２スタンドの圧下変更も半分完
了するようなタイミング速度と圧下を変更し、No.
１スタンドとNo.２スタンド間の張力変動を抑えて
いる。以降、サイズ変更点が後段スタンド通過時
にも速度変更の時間的中心点と圧下変更の時間的
中心点とが一致するように速度と圧下の変更タイ
ミングを制御する。 Here, taking the point at which the size change point passes the No. 2 stand as an example, when the size change point passes the No. 2 stand, by changing the speed of the No. 1 stand to the next schedule, the speed upstream from the size change point can be changed to the next schedule. The side, that is, between the No. 1 stand and No. 2 stand, is changed to the speed ratio of the next coil. No.1 Due to the change in speed
The tension between the No. 1 stand and the No. 2 stand fluctuates, but the lowering position of the No. 2 stand is changed to absorb this tension fluctuation. In general, speed change speed > roll position change speed, and if you change the speed and roll position of No. 1 stand at the same time as in the past, the difference between the speed and roll change time will cause the difference between No. 1 stand and No. 1 stand.
The tension between the two stands will vary. In the present invention, as shown in FIG. 3, the speed change amount (Δv 1 = v 1 −
v 1 ′) and the reduction change allowance (Δs = s 2 − s 2 ′), find the speed and reduction change time, and set it so that the speed change of No. 1 stand is half completed when the size change point passes No. 2 stand. In addition, the timing speed and reduction were changed so that half of the change in the reduction of No. 2 stand was completed.
This suppresses tension fluctuations between stand 1 and stand No. 2. Thereafter, the timing of changing the speed and reduction is controlled so that the temporal center point of the speed change and the temporal center point of the reduction change coincide even when the size change point passes through the rear stage stand.

次に本発明の実施効果を示す。第４図は従来の
速度と圧下を同時に変更した場合のNo.１スタンド
とNo.２スタンド間の張力を、第５図は本発明実施
時のNo.１スタンドとNo.２スタンド間の張力の変動
を示す。圧延条件は原板厚3.5mm→成品厚0.7mmか
ら原板厚4.0mm→成品厚1.0mmへの走間スケジユー
ル変更時である。本発明により走間スケジユール
変更時の張力変動は1/3以下に抑制可能であり、
安定圧延が可能となる。また張力変動の抑制によ
り走間スケジユール変更時の板厚変更代を大幅に
拡大可能となる。 Next, the effects of implementing the present invention will be shown. Figure 4 shows the tension between the No. 1 and No. 2 stands when the conventional speed and reduction were changed at the same time, and Figure 5 shows the tension between the No. 1 and No. 2 stands when the present invention was implemented. shows the fluctuation of The rolling conditions are when the running schedule is changed from original plate thickness 3.5 mm → finished product thickness 0.7 mm to original plate thickness 4.0 mm → finished product thickness 1.0 mm. According to the present invention, tension fluctuations when changing the running schedule can be suppressed to 1/3 or less,
Stable rolling becomes possible. In addition, by suppressing tension fluctuations, it is possible to significantly expand the margin for changing plate thickness when changing the running schedule.

以上説明したように本発明では走間板厚変更時
の速度と圧下の変更時間不一致による張力変動を
極力小さくすべく、速度変更の時間的中心点と圧
下変更の時間的中心点とを一致させるように速度
と圧下の変更タイミングを制御するので、走間ス
ケジユール変更時の張力変動を1/3以下に抑制可
能であり、これにより、従来の板厚変更代の制限
を大幅に緩和可能となる。 As explained above, in the present invention, the temporal center point of the speed change and the temporal center point of the reduction change are made to coincide with each other in order to minimize the tension fluctuation due to the discrepancy between the speed and the change time of the reduction when changing the running plate thickness. Since the timing of changes in speed and reduction is controlled in this way, it is possible to suppress tension fluctuations when changing the running schedule to less than 1/3, making it possible to significantly ease the conventional restrictions on plate thickness changes. .

【図面の簡単な説明】[Brief explanation of drawings]

第１図はタンデム圧延機の圧下、速度各制御系
を示すブロツク図、第２図は走間スケジユール変
更時の圧下と速度変更タイミングの一例を示す説
明図、第３図は本発明の変更タイミングの説明
図、第４図および第５図は張力変動を示すグラフ
で前者は従来例、後者は本発明例である。 図面でNo.１〜No.５はタンデム圧延機の第１〜第
５スタンド、１は圧延材、２は圧延機、３は圧下
装置、４は圧下制御装置、５は電動機、６は速度
制御装置、７はサイズ変更点の検出装置、８はパ
ルス発振器、９はトラツキング装置、１０は圧下
変更装置、１１は速度変更装置、１２は走間スケ
ジユール変更装置である。 Fig. 1 is a block diagram showing the rolling reduction and speed control systems of a tandem rolling mill, Fig. 2 is an explanatory diagram showing an example of rolling reduction and speed change timing when changing the rolling schedule, and Fig. 3 is a change timing according to the present invention. 4 and 5 are graphs showing tension fluctuations, the former being a conventional example and the latter being an example of the present invention. In the drawing, No. 1 to No. 5 are the first to fifth stands of the tandem rolling mill, 1 is the rolling material, 2 is the rolling machine, 3 is the rolling device, 4 is the rolling control device, 5 is the electric motor, and 6 is the speed control. 7 is a size change point detection device, 8 is a pulse oscillator, 9 is a tracking device, 10 is a reduction change device, 11 is a speed change device, and 12 is a running schedule change device.

Claims (1)

【特許請求の範囲】[Claims] １ タンデム圧延機においてサイズ変更点がｉス
タンド通過時にｉスタンドより上流側のスタンド
の速度を一斉に変更するか、又はｉスタンドより
下流側のスタンドの速度を一斉に変更することに
より、ｉ−１スタンド以前の速度スケジユールを
次コイルのスケジユールとし同時にｉスタンドの
圧下位置を次コイルのスケジユールとする走間ス
ケジユール変更において、速度変更の時間的中心
点と圧下位置変更の時間的中心点とを一致させる
ように速度と圧下位置の変更タイミングを制御す
ることを特徴としたタンデム圧延機の走間スケジ
ユール変更方法。1 In a tandem rolling mill, when the size change point passes through stand i, by changing the speed of the stands upstream from stand i all at once, or by changing the speed of the stands downstream from stand i all at once, i-1 When changing the running schedule in which the speed schedule before the stand is used as the schedule for the next coil and the lower position of the i-stand is used as the schedule for the next coil, the temporal center point of the speed change and the temporal center point of the lower position change are made to coincide. A method for changing the running schedule of a tandem rolling mill, which is characterized by controlling the timing of changing the speed and rolling position in this manner.
JP57209570A 1982-11-30 1982-11-30 Method of changing schedule of tandem rolling mill during running Granted JPS59101213A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57209570A JPS59101213A (en) 1982-11-30 1982-11-30 Method of changing schedule of tandem rolling mill during running

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57209570A JPS59101213A (en) 1982-11-30 1982-11-30 Method of changing schedule of tandem rolling mill during running

Publications (2)

Publication Number Publication Date
JPS59101213A JPS59101213A (en) 1984-06-11
JPS6352963B2 true JPS6352963B2 (en) 1988-10-20

Family

ID=16575014

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57209570A Granted JPS59101213A (en) 1982-11-30 1982-11-30 Method of changing schedule of tandem rolling mill during running

Country Status (1)

Country Link
JP (1) JPS59101213A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61180607A (en) * 1984-10-02 1986-08-13 Nippon Steel Corp Control method for sheet thickness in rolling made for changing sheet-thickness during rolling
JPS61273210A (en) * 1985-05-27 1986-12-03 Nippon Steel Corp Changing method for flying schedule of tandem rolling mill
JPS61276709A (en) * 1985-05-31 1986-12-06 Kawasaki Steel Corp Shape controlling method for rolling mill
JP2002178015A (en) * 2000-12-18 2002-06-25 Kawasaki Steel Corp Method for changing plate thickness in running in continuous cold tandem mill

Also Published As

Publication number Publication date
JPS59101213A (en) 1984-06-11

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