JPS6039442B2

JPS6039442B2 - How to control the width of plate material

Info

Publication number: JPS6039442B2
Application number: JP55040908A
Authority: JP
Inventors: 正敏井上; 和男板橋
Original assignee: Kawasaki Steel Corp
Current assignee: JFE Steel Corp
Priority date: 1980-03-28
Filing date: 1980-03-28
Publication date: 1985-09-06
Also published as: JPS56136210A

Description

【発明の詳細な説明】本発明は、板材の幅制御方法に係わり、特に幅出し圧延
後の板材の厚さを制御することによって目標板幅の板材
を製造する板材の幅制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the width of a plate, and more particularly to a method for controlling the width of a plate, in which a plate having a target width is manufactured by controlling the thickness of the plate after tentering rolling.

厚板等板材の圧延では、目標板幅を得るのに、可逆圧延
機を使用し、圧延材を９０ｏ回転して行う幅出し圧延に
よって行っている。In rolling plate materials such as thick plates, a reversible rolling mill is used to obtain the target plate width by tentering rolling in which the rolled material is rotated by 90 degrees.

この幅出し圧延に於ける圧延中の制御は、目標厚制御に
よって行われていて、厚み制御の結果としては板幅が制
御される方法をとっている。この方法を以下説明する。
Ｗｓ：幅出し圧延前のスラブ幅ＷＲ：幅出し圧延に於ける圧延目標幅ＨｏＢＴ：幅出し圧延前のスラブ厚Ｈ側：幅出し圧延後のスラブ厚とすると次の式が成立する。Control during rolling in this tentering rolling is performed by target thickness control, and a method is adopted in which the strip width is controlled as a result of the thickness control. This method will be explained below.
Ws: Slab width before tentering rolling WR: Rolling target width in tentering rolling HoBT: Slab thickness before tentering rolling H side: Slab thickness after tentering rolling, then the following equation holds true.

ＨＤＷ＝日。HDW=day.

ＢＴＸ器．・・．・・．・仙従って、ｗＲ＝ｗＳ
Ｘ帯．・・．・・．・剛となり、ＨｏＢＴは幅出
し圧延前のスラブ厚であるので圧延前に実測され、従っ
て幅出し圧延後のスラブ厚であるＨＤｗを圧延制御する
ことにより幅出し圧延に於ける圧延目標幅ＷＲが２次的
に制御されることになる。BTX device.・・・．・・・．・Sen, therefore, wR=wS
X-band.・・・．・・・．・HoBT is the slab thickness before tentering rolling, so it is actually measured before rolling. Therefore, by controlling the rolling of HDw, which is the slab thickness after tentering rolling, the rolling target width WR in tentering rolling can be set. It will be controlled secondary.

しかしながら、一般に幅出し圧延前に数パス圧延して形
成を整え、素材スラブ幅はこの幅出し圧延前の圧延で多
少幅が広がっており、従来の板材の幅制御方法では圧延
機の付近に幅計を設けていないため、幅出し圧延前のス
ラブ幅は素材スラブ幅の数値をそのまま用いていた。However, in general, the material slab width is expanded by several passes of rolling before tentering rolling, and the width of the material slab is increased somewhat by rolling before tentering rolling. Since no gauge was provided, the value of the material slab width was used as is for the slab width before tentering rolling.

その結果従来の板材の幅制御方法では、幅出し圧延前の
スラブ幅Ｗｓの値がばらついたり、幅出し圧延前パス及
び幅出し圧延後パスでの幅拡り等により実圧延幅は目標
幅ＷＲに相当のバラッキをもっている。第１図は従来の
板材の幅制御方法によって圧延した場合の実圧延幅の目
標幅ＷＲに対するバラッキの度合を示す図面で、縦軸に
圧延材の個数をとり、機軸に実圧延幅の目標圧延幅ＷＲ
との差の値がとってある。第１図に示す圧延材の個数Ｎ
＝１３８であり、従来の板材の幅制御方法による第１図
の実験では精度。＝１２．５脚である。本発明は、前記
従来の板材の幅制御方法の欠点を排除するためになされ
たもので、精度の良い板材の幅制御方法を提案すること
を目的としている。As a result, in the conventional sheet material width control method, the actual rolling width is equal to the target width WR due to variations in the value of the slab width Ws before tentering rolling, and width expansion in the pre-tenting rolling pass and the post-tenting rolling pass. There is considerable variation in the Figure 1 is a diagram showing the degree of variation in the actual rolling width with respect to the target width WR when rolled by the conventional width control method for plate materials.The vertical axis represents the number of rolled materials, and the machine axis represents the target rolling width of the actual rolling width. Width WR
The value of the difference between Number N of rolled materials shown in Figure 1
= 138, which is the accuracy in the experiment shown in Figure 1 using the conventional plate width control method. =12.5 legs. The present invention was made in order to eliminate the drawbacks of the conventional method for controlling the width of a plate material, and an object of the present invention is to propose a method for controlling the width of a plate material with high accuracy.

本発明では、従来の板材の幅制御方法による板材の幅の
バラツキの原因を次の４項目に分析した。In the present invention, the causes of variations in the width of a plate due to the conventional width control method of a plate are analyzed into the following four items.

■ 素材スラブ幅のバラッキ ■ 幅出し圧延前パスでの幅拡り ■ 幅出し圧延パス時の板厚精度のバラッキ■ 幅出し
圧延後パスでの幅拡り本発明は前記４項目に対し以下に
述べるような対策をとり、実圧延幅の目標値ＷＲに対す
るバラッキを解消するものである。■ Variation in the width of the material slab ■ Width expansion in the pass before tentering rolling ■ Variation in plate thickness accuracy during the tentering rolling pass ■ Width expansion in the pass after tentering rolling The present invention addresses the above four items as follows. The measures described above are taken to eliminate the variation in the actual rolling width with respect to the target value WR.

即ち前記■、■は幅出し前パスの最終パスを通過した板
材の幅を幅計によって計測した実測幅Ｗｓ，により吸収
する。また前記■の幅出し圧延パス時の板厚精度のバラ
ッキについては経験により求めた定数Ｑによって吸収す
る。更に前記■の幅出し圧延後パスでの幅拡りについて
は、圧下率、ロール径板厚比、板幅板厚比、温度および
前回圧延材の実測幅拡り量等のファクターを用いた幅拡
り演算値△Ｗｐにより吸収する。That is, the above (2) and (2) are absorbed by the actual width Ws, which is obtained by measuring the width of the plate material that has passed the final pass before tentering with a width meter. In addition, the variation in plate thickness accuracy during the tentering rolling pass mentioned in (2) above is absorbed by the constant Q determined from experience. Furthermore, regarding the width expansion in the pass after tentering rolling mentioned in (■) above, the width is determined using factors such as rolling reduction, roll diameter plate thickness ratio, plate width plate thickness ratio, temperature, and the measured width expansion amount of the previously rolled material. It is absorbed by the spread calculation value ΔWp.

以下本発明に係わる板材の幅制御方法に係わる好ましい
実施例を詳説する。Preferred embodiments of the method for controlling the width of a plate according to the present invention will be described in detail below.

前記【１｝式に於いて、本発明は各数値を次の如く修正
する。In the above formula [1}, the present invention modifies each numerical value as follows.

｛ィ）幅出し圧延前のスラブ幅Ｗｓの代りに、幅出し圧
延前パスでの最終パス後の実測幅Ｗｓ，を用いる。{i) Instead of the slab width Ws before tentering rolling, the measured width Ws after the final pass before tentering rolling is used.

｛ｏ｝幅出し圧延に於ける圧延目標幅ＷＲを幅拡り※
※演算値△Ｗｐ、定数Ｑにより補正する。{o} Expanding the rolling target width WR in tenter rolling*
*Corrected by calculated value △Wp and constant Q.

従って、（１｝式は次のｔ３｝式のように修正される。Therefore, the expression (1} is modified as the following expression t3}.

Ｗｓ，．．．．．．．・・｛３’日。Ｗ＝
日。ＢＴ×ＷＲ−△Ｗｐ＋ＱここでＱは前記したように
幅出し圧延パスでの板厚のバラッキによる幅ＷＲのバラ
ッキを補正するための定数である。Ws, . ．．．．．．．．．．．． ...{3' days. W=
Day. BT×WR−ΔWp+Q Here, Q is a constant for correcting the variation in the width WR due to the variation in the plate thickness in the tentering rolling pass, as described above.

なお実測幅Ｗｓ，を測定するのに用いる幅計は既存の光
学式幅計等で十分な精度で測定可能である。次に幅拡り
演算値△Ｗｐの求め方を説明する。Note that the width meter used to measure the actual width Ws can be an existing optical width meter or the like with sufficient accuracy. Next, how to obtain the width expansion calculation value ΔWp will be explained.

先ず圧延パススケジュールの演算結果から、幅拡り予測
値△Ｗｐｃを求める。△ＷＰＣ＝子△Ｗｐｉ＝子｛ａｙ
ｉ＋ｂ舟Ｃ帯十ｄＴｉ＋ｅ｝ｋｔ
・・・…・・・（４ーここで△Ｗｐｉ：ｉパス目幅松り
量の幅出し最終パス換算値ｙｉ：ｉパス目圧下率Ｒ：ミルワークロール半径（側）ｈｉ：ｉパス目入側板厚（肋）Ｍ：ｉパス目圧延幅（肌）Ｔｉ：ｉパス目圧延幅出側平均温度（００）ａ〜ｅ：影
響係数ＫＴ：幅出し最終パス出側温度とｉパス目圧延材
側平均温度の線膨張の補正係数ＫＴ＝（１十３ＴＤｗ）
／（１十３Ｔｉ）Ｔｏｗ：幅出し最終パス出側温度（平
均）８：線膨張係数前回圧延材（ｎ−１本目）の実測幅舷り量は幅出し圧延
後パスに於ける各パス毎の幅拡り量を幅計によって実測
して次式によって幅出し最終パスでの換算値△ＷＡとし
て示す。First, a predicted width expansion value ΔWpc is determined from the calculation result of the rolling pass schedule. △WPC=child△Wpi=child{ay
i+bfuneC band 10dTi+e}kt
・・・・・・・・・(4-Here, △Wpi: i-th pass width bending amount converted to the final pass of tentering yi: i-th pass rolling reduction ratio R: millwork roll radius (side) hi: i-th pass Entrance plate thickness (rib) M: i-th rolling width (skin) Ti: i-th rolling width average exit side temperature (00) a~e: influence coefficient KT: final pass exit temperature of tentering and i-th rolling Correction coefficient of linear expansion of material side average temperature KT = (113TDw)
/(113Ti)Tow: Final pass of tentering exit temperature (average) 8: Coefficient of linear expansion The actual measured width of the previously rolled material (n-1th roll) is calculated for each pass after tentering rolling. The amount of width expansion is actually measured using a width meter and is expressed as a converted value ΔWA in the final pass of width adjustment using the following equation.

例えば幅出し後パスでの実測幅拡り量を１０肋（８００
００）とすると、これを幅出し最後パスでの値に換算す
ると１５肋（１０００ｑｏ）となるように温度の補正を
する。△Ｗ＾：キ△Ｗ＾ｊＫＴここでＷ＾ｉ：ｊパス目
の幅拡り実測値 △Ｗ＾＝Ｗ＾ｊ−ＷＡｊ−．（１十８Ｔｊ）／（１十３
Ｔｊ‐，）ここでＷ＾ｉ：ｊパス目出側実測幅Ｗ＾ｊ‐
，：（ｊ−１）パス目出側実測幅Ｔｊ−，：（ｊ−ｉ）
パス目出側平均温度次に幅拡り量実測値△Ｗ＾により△
Ｗｐｃの補正方法を説明すると、現在圧延中の圧延材（
ｎ本目）の幅出し後幅拡り量予測値（△Ｗｐ）ｎは次式
から求まる。For example, the actual width expansion amount in the post-tensioning pass is 10 ribs (800
00), the temperature is corrected so that the value at the last pass of tentering becomes 15 ribs (1000 qo). △W^: Ki△W^jKT where W^i: Actual measurement value of width expansion of j-th pass △W^=W^j-WAj-. (118Tj)/(113
Tj-,) Here, W^i: Actual measured width on the j-pass exit side W^j-
, :(j-1) Actual measurement width Tj-, :(j-i)
Pass average temperature on exit side, then width expansion actual measurement value △W^ △
To explain the Wpc correction method, the rolled material currently being rolled (
The predicted width expansion amount (△Wp) n of the nth piece) after tentering can be found from the following equation.

（△Ｗｐ）ｎ＝Ａ（△ＷＰＣ）ｎ＋（１一Ａ）（△ＷＰＣ）ｎそ会帯岸牢二ここでｎ：ｎ
本目圧延材ｎ−１：（ｎ−１）本目圧延材ＡＳＩ．０をそれぞれ示す。(△Wp) n = A (△WPC) n + (11A) (△WPC) n Sokai Obigishi Kyouji where n: n
Mainly rolled material n-1: (n-1) Mainly rolled material ASI. 0 is shown respectively.

以上の演算を行い、この（△Ｗｐ）ｎを前記‘３｝式の
△Ｗｐとして出力し、幅出し最終厚目標日。ｗを決定す
ることにより圧延幅を制御するものである。第２図は、
以上の制御方法のフローを示す図面である。次に本発明
に係る板材の幅制御方法と従来の板材の幅制御方法との
精度を比較する。After performing the above calculations, this (△Wp)n is output as △Wp in the formula '3} above, and the final thickness target date for tentering is determined. The rolling width is controlled by determining w. Figure 2 shows
It is a drawing which shows the flow of the above control method. Next, the accuracy of the method for controlling the width of a plate according to the present invention and the conventional method for controlling the width of a plate will be compared.

従来の板材の幅制御方法による精度は。What is the accuracy of conventional board width control methods?

Ｔ＝１２．５肋である。即ち、■ 素材スラブ幅のバラ
ツキ。T=12.5 ribs. Namely, ■ Variation in the width of the material slab.

・＝５側■ 幅拡りのバラッキ（幅出し前）。・=5 side ■ Width widening barracks (before width adjustment).

２＝４肌■ 幅拡りのバラツキ（幅出し後）。2 = 4 skin■ Variation in width expansion (after width adjustment).

３こ２側■ その他のバラツキ。3-2 side■ Other variations.

４＝４．４肋なお平均幅出し比（ス圧ラ延聖馬）＝・‐８なので■、
■は１．８倍する。4 = 4.4 ribs and average width ratio (Sura Rolling Seima) = ・-8, so■,
■ is multiplied by 1.8.

。Ｔ＝ノ（１．８０，）２十（１．８０２）２十。
き＋。孝三１２．５肌しかしながら、前記本発明に係わ
る実施例によれば、〇．二０、０２三０、。３≠０とな
り、圧延精度はＯＴ〒０４＝４．４肋となり大幅な精
度の向上が期待でき、この結果製品の歩止りは大幅に向
上する。. T=ノ(1.80,)2 10(1.802)2 10.
Ki+. However, according to the embodiments of the present invention, 0. 20, 0230. 3≠0, and the rolling accuracy becomes OT〒04 = 4.4 ribs, and a significant improvement in accuracy can be expected, resulting in a significant improvement in the yield of the product.

以上説明したように本発明に係る板材の幅制御方法によ
れば、可逆圧延機に幅計を設け、素材スラブ幅のバラツ
キ、幅出し圧延前パスでの幅拡り、幅出し圧延後の幅拡
りを補正することが出来るので精度のよい板材の幅制御
が可能となる。As explained above, according to the method for controlling the width of a plate material according to the present invention, a width gauge is installed in a reversing rolling mill, and the width of the material slab can be adjusted to reduce the variation in the width of the material slab, the width expansion in the pass before tentering rolling, and the width after tentering rolling. Since the spread can be corrected, the width of the plate material can be controlled with high precision.

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

第１図は従来方法によって圧延した場合の実圧延幅の目
標幅ＷＲに対するバラツキの度合を示す図面、第２図は
本発明に係る制御方法のフローを示す図面である。第１図第２図FIG. 1 is a diagram showing the degree of variation in the actual rolling width with respect to the target width WR when rolling is performed by the conventional method, and FIG. 2 is a diagram showing the flow of the control method according to the present invention. Figure 1 Figure 2

Claims

【特許請求の範囲】[Claims]

１幅出し圧延後の板材の厚さを制御することによつて
目標板幅の板材を製造する板材の幅制御方法に於いて、
可逆圧延機の前面側又は後面側の少なくとも一方側に板
材の幅計を設け、素材スラブ幅のバラツキ並びに幅出し
圧延前パスでの幅拡りに対しては幅出し圧延前パスの最
終パス通過後の板材の実測幅を前記幅計により測定して
幅出し圧延前のスラブ幅を補正するとともに、幅出し圧
延後パスでの幅拡りに対しては幅出し圧延後パスにおけ
るパススケジユールにもとづいて幅拡り量の予測値を計
算し、この予測値を前回に圧延した板材の幅出し圧延後
パスにおける幅拡り量の前記幅計による実測値を用いて
補正し、前記幅出し前パスのスラブ幅の補正値と、幅出
し後パスでの予測幅拡り量の補正値により幅出し圧延後
の板厚を演算して、この板厚になるように幅出し最終パ
スの圧延を行うことを特徴とする板材の幅制御方法。1. In a method for controlling the width of a plate material, which manufactures a plate material having a target width by controlling the thickness of the plate material after tentering rolling,
A width gauge for the plate material is provided on at least one of the front side or the rear side of the reversible rolling mill, and in order to check for variations in the width of the material slab and for width expansion in the pre-tenting rolling pass, the width meter is installed in the final pass of the pre-tenting rolling pass. The width of the slab before tentering rolling is corrected by measuring the actual width of the subsequent plate material using the width meter, and the width expansion in the pass after tentering rolling is based on the pass schedule in the pass after tentering rolling. The predicted value of the width expansion amount is calculated using the width gage, and this predicted value is corrected using the actual value measured by the width gage of the width expansion amount in the post-tenting rolling pass of the previously rolled plate material, and then The plate thickness after tentering rolling is calculated using the correction value of the slab width and the correction value of the estimated width expansion amount in the post-tenting pass, and the final tenting pass is rolled to achieve this thickness. A method for controlling the width of a plate material.