JPS62192205A - Method for controlling rolling shape of strip - Google Patents
Method for controlling rolling shape of stripInfo
- Publication number
- JPS62192205A JPS62192205A JP61032126A JP3212686A JPS62192205A JP S62192205 A JPS62192205 A JP S62192205A JP 61032126 A JP61032126 A JP 61032126A JP 3212686 A JP3212686 A JP 3212686A JP S62192205 A JPS62192205 A JP S62192205A
- Authority
- JP
- Japan
- Prior art keywords
- edge
- rolling
- tension
- strip
- roll
- 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
- 238000005096 rolling process Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims description 13
- 239000000463 material Substances 0.000 abstract description 9
- 229910000831 Steel Inorganic materials 0.000 abstract description 8
- 239000010959 steel Substances 0.000 abstract description 8
- 230000015556 catabolic process Effects 0.000 abstract 3
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/40—Control of flatness or profile during rolling of strip, sheets or plates using axial shifting of the rolls
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、圧延する素材の寸法・材質や圧延荷重が変
化しても形状が良好で破断が発生せず、かつエツジドロ
ップの小さいストリップを得ることのできる方法に関す
るものである。[Detailed Description of the Invention] (Field of Industrial Application) This invention provides a strip that has a good shape, does not break even when the dimensions and material of the material to be rolled, and the rolling load change, and has a small edge drop. It's about how you can get it.
（従来の技術）
金属ストリップの圧延においては、板縁部（以下エツジ
と云う）においてロールの偏平化の度合が小さいため板
縁部板厚減少（以下エツジドロップと云う）が不可避で
ある。(Prior Art) In the rolling of metal strips, the degree of flattening of the rolls at the edges of the strip (hereinafter referred to as edges) is small, so a decrease in the thickness of the edge of the strip (hereinafter referred to as edge drop) is unavoidable.
従来から、このエツジドロップ防止対策として、（１）
被圧延板の両エツジに接するロールの直径を端面方向に
漸次小さくしたチー、ｏ−ロールで圧延することによシ
、被圧延材の両エツジにおける圧延圧力を軽減し、エツ
ジドロップを減少させる方法。Conventionally, as measures to prevent this edge drop, (1)
A method of reducing the rolling pressure at both edges of a material to be rolled and reducing edge drop by rolling with a chi or o-roll in which the diameter of the rolls in contact with both edges of the material to be rolled is gradually reduced in the end face direction. .
（２）特に片側に先細り研削した上下ワークロールを被
圧延板の幅に応じて移動させて被圧延板に接するチー、
ｅ−長さを一定に保持する方法（例えば特開昭５５−７
７９０３号公報）、（３１（１１，（２１のテーパーワ
ークロール圧延において、ワークロールの軸受に荷重を
かけワークロールをベンディングする方法。(2) A chi that touches the rolled plate by moving the upper and lower work rolls, which have been ground to be tapered on one side, according to the width of the rolled plate;
e-Method of keeping the length constant (for example, JP-A-55-7
7903 Publication), (31 (11, (21) Tapered work roll rolling, method of bending the work roll by applying a load to the bearing of the work roll.
（４） （１）、 （２１のチーノミ−ワークロール
圧延において、）々ツクアップロールのクラウンを調整
する方法（例えば特開昭５８−２０９４１１号公報）、
等が検討されている。(4) A method of adjusting the crown of each pick-up roll in (1) and (21) chimney-work roll rolling (for example, Japanese Patent Application Laid-Open No. 58-209411);
etc. are being considered.
（発明が解決しようとする問題点）
さて、前述した従来の技術（１）〜（４）例も以下の如
き欠点を有している。(Problems to be Solved by the Invention) The examples of conventional techniques (1) to (4) described above also have the following drawbacks.
（１）の場合：被圧延材の板幅によってチーＡ−長さが
変り、板破断が発生したり、エツジドロップ防止の効果
が少なかったシする。In the case of (1): The length of the chi A changes depending on the width of the material to be rolled, resulting in plate breakage or lack of edge drop prevention effect.
（２）の場合：この被圧延板に接するテーパー長さを一
定に保持する方法では、小さいエツジドロップを安定し
て得ることはできない。これは、圧延によって生じるエ
ツジドロップがテーパー長の外に素材のクラウン、材質
あるいは圧延荷重によって変化すると同時に形状も変化
し、板破断が発生し、安定な圧延を続行することができ
ないからである。一般に、テーパ−ワークロール方式で
は、ストリップ幅方向の中央部がより伸ばされて中伸び
形状となり、一方ストリップのエツジは圧延圧力が軽い
ためメタルフローが極端に抑制てれるので、エツジ近傍
に高い応力が集中する。したがって、一定のテーパー長
で圧延を続けると、圧延素材のクラウンや圧延荷重が変
化したときにエツジ近傍に過大な応力が集中し、板破断
が発生したシ、圧延後のエツジドロップが大きくなった
りする。Case (2): With this method of keeping the length of the taper in contact with the rolled plate constant, it is not possible to stably obtain a small edge drop. This is because the edge drop caused by rolling changes not only by the taper length but also by the crown of the material, the material, or the rolling load, and the shape also changes at the same time, causing plate breakage and making it impossible to continue stable rolling. Generally, in the tapered work roll method, the central part of the strip in the width direction is more elongated and has a medium elongated shape, while the edges of the strip are subject to light rolling pressure, so metal flow is extremely suppressed, so stress is high near the edges. is concentrated. Therefore, if rolling is continued at a constant taper length, excessive stress will be concentrated near the edges when the crown of the rolled material or the rolling load changes, resulting in plate breakage and increased edge drop after rolling. do.
（３）の場合：テーパーワークロール方式によるエツジ
近傍の過大な応力集中の改良策として有効なるも、ワー
クロールをベンディングできる力は軸受の許容強度内で
なければならず、自ずからベンディング量は制約される
。Case (3): Although the tapered work roll method is effective as a measure to improve excessive stress concentration near the edges, the force that can bend the work roll must be within the allowable strength of the bearing, and the amount of bending is naturally limited. Ru.
（４）の場合：補強ロールのクラウンを調整する方法も
、その補強ロール内に生じる許容応力内でしか調整でき
ず、チーノミ−ワークロール圧延で被圧延板のエツジ近
傍に発生する過大な張力を緩和するには不十分である。Case (4): The method of adjusting the crown of the reinforcing roll can only be adjusted within the allowable stress generated within the reinforcing roll, and the excessive tension that occurs near the edges of the rolled plate during chimney work roll rolling can be adjusted only within the allowable stress that occurs within the reinforcing roll. Not enough to alleviate it.
本発明の目的とするところは、上述しだテーノや一ロー
ルによる圧延法の欠点を解消し、たとえ圧延条件が変化
しても常に安定した形状を確保し、かつエツジドロップ
を未然に防止する手段を提供することにある。The object of the present invention is to eliminate the drawbacks of the above-mentioned rolling method using a single roll and to ensure a stable shape even if the rolling conditions change, and to prevent edge drops. Our goal is to provide the following.
（問題点を解決するだめの手段、作用）本発明の要旨と
するところは、ロール胴部の一端を漸次直径を細くした
一対のワークロールを上下交互に組込みロール軸方向に
移動可能とした圧延機で圧延するに当り、被圧延板のエ
ツジ近傍に張力測定器を配設し、該張力測定器で求めた
被圧延板のエツジ近傍の張力値が一定になるように被圧
延板のエツジに接するワークロールのテーノｅ＝長さを
調整することを特徴とするストリップの圧延形状制御方
法である。(Means and effects for solving the problem) The gist of the present invention is to provide a rolling method in which a pair of work rolls each having a diameter gradually reduced at one end of the roll body are incorporated vertically and movably in the axial direction of the rolls. When rolling with a machine, a tension measuring device is installed near the edge of the plate to be rolled, and tension is applied to the edge of the plate to be rolled so that the tension value near the edge of the plate to be rolled, as determined by the tension measuring device, is constant. This is a strip rolling shape control method characterized by adjusting the length of the work rolls in contact with each other.
以下に本発明の詳細な説明する。The present invention will be explained in detail below.
まず、本発明を適用する圧延機は、第２図に示す如く、
前述したエツジドロップ防止策（２）の片側チー、ｏ−
ワークロール方式である。即ち、上下一対のロール直径
Ｄ２のワークロールの一端のみ漸次直径を先細くロール
直径Ｄ１に切削したテーパー長Ｒｗのテーノソーワーク
ロール１を上下交互に糾込み、ストリップＳを噛み込む
と板幅に応じワークロール１がロール軸方向に可動する
ことにより、ワークロールとストリップのエツジとの接
触圧力を減少させてエツジドロップを有効に防止するも
のである。なお、２はノ々ツクアップロールである。First, the rolling mill to which the present invention is applied is as shown in FIG.
One side of the edge drop prevention measure (2) mentioned above, o-
It is a work roll method. That is, one end of a pair of upper and lower work rolls with a roll diameter D2 is gradually tapered to a roll diameter D1, and the tenosaw work rolls 1 with a taper length Rw are rolled up and down alternately, and when the strip S is bitten, it becomes the board width. By moving the work roll 1 in the roll axis direction, the contact pressure between the work roll and the edge of the strip is reduced, and edge drops are effectively prevented. Note that 2 is a knock-up roll.
さて、本発明法は、前述したこの片側テーパーロール方
式の従来の欠点であるエツジ近傍の高応力集中を防止す
るもので、第１図に示す如く圧延機出側に、ストリップ
Ｓのエツジ近傍の張力を計測する張力測定器３を配設し
、この張力測定器３で測定したス） ＩＪツブエツジ近
傍の張力値がストリップの破断応力を超えない一定範囲
になるように、ロールテーパ一部の圧延長さを演算制御
装置４を介しテーパーワークロール１を軸方向に移動さ
せ、ストリップのエツジに接するテーパー長さＳｗを調
整することによシストリップの板破断を防ぎ、かつ圧延
中のワークロール形状によって可能な最大のエツジドロ
ップ防止効果を得るものである。Now, the method of the present invention is to prevent the high stress concentration near the edges, which is the conventional drawback of this one-sided tapered roll method mentioned above, and as shown in FIG. A tension measuring device 3 is installed to measure the tension, and the pressure on a part of the roll taper is adjusted so that the tension value near the IJ edge is within a certain range that does not exceed the breaking stress of the strip. By moving the tapered work roll 1 in the axial direction via the arithmetic and control unit 4 and adjusting the taper length Sw in contact with the edge of the strip, breakage of the strip is prevented and the shape of the work roll during rolling is adjusted. This provides the maximum possible edge drop prevention effect.
この出側被圧延板縁部の張力の測定位置は、ワークロー
ルのテーパー圧延部であることが必要であり、かつ可能
なかぎシエツジ近傍であることが望ましい。又、出側被
圧延板のエツジの張力測定器は、被圧延板を磁力で吸引
しそのたわみを電気的に計測する静電容量式又は電磁相
関式張力計でも、或いは幅方向に分割したロールにかか
る垂直荷重を計測するロードセル式張力計でもよい。The tension measurement position at the edge of the rolled plate on the exit side needs to be at the tapered rolling part of the work roll, and preferably near the possible hooking point. In addition, the tension measuring device at the edge of the rolled plate on the exit side may be a capacitance type or electromagnetic correlation type tension meter that magnetically attracts the rolled plate and electrically measures its deflection, or a roll divided in the width direction. A load cell tension meter that measures the vertical load applied to the tension meter may also be used.
（実施例）
以下に、本発明による実施例をテーパぐ−ワークロール
圧延によって得られる被圧延板のクラウンと幅方向張力
分布との関係において説明する。なお、第１表に本実施
例に使用した圧延機及び圧延条件を示す。(Example) Examples according to the present invention will be described below with reference to the relationship between the crown of a rolled plate obtained by tapered work roll rolling and the tension distribution in the width direction. Note that Table 1 shows the rolling mill and rolling conditions used in this example.
第 １ 表
４重５スタンド冷間圧延機の１号スタンドに、直径５０
０萌φ、胴長１４００ｍのワークロールの片側にロール
のテーパぞ−長さ２５０＋ｍでロールのチーＡ−最大径
差７５０μの先細り研削を行ったロールを上下交互に組
込み、２．８ｗｉ厚、１２２０■幅で幅方向中央とエツ
ジよシ１５陥点の板厚差が２％の凸クラウンの軟鋼を圧
延した。この場合の被圧延板のクラウンを第３図に、板
幅方向の張力分布を第４図に示す。Table 1 The No. 1 stand of the 4-layer 5-stand cold rolling mill has a diameter of 50 mm.
On one side of a work roll with a diameter of 0 mm and a body length of 1400 m, a tapered roll with a roll taper length of 250 + m and a maximum diameter difference of 750 μ is installed vertically and alternately, 2.8wi thickness, 1220 m. ■ Mild steel with a convex crown was rolled with a thickness difference of 2% between the center in the width direction and the 15th edge point. The crown of the rolled plate in this case is shown in FIG. 3, and the tension distribution in the width direction of the plate is shown in FIG.
なお、本実施例で使用した張力計は、ロードセル式張力
計である。Note that the tension meter used in this example is a load cell type tension meter.
上記鋼板を第２図テーパ一部圧延長さＳｗを５０門で圧
延したところ、被圧延板のクラウンはテーパーロールの
効果で第３図（イ）のごとく約２％エツジアップし、張
力分布は第４図（イ）であった。When the above-mentioned steel plate was rolled with a tapered partial rolling length Sw shown in Fig. 2 using 50 gates, the crown of the rolled plate edged up by about 2% as shown in Fig. 3 (a) due to the effect of the tapered roll, and the tension distribution was It was shown in Figure 4 (a).
ところが入側の鋼板のクラウンを凸２％から凸３％に変
化させると、第３図（ロ）で示す如く、エツジアップは
低下し、同時に張力は第４図（ロ）で示すようにとくに
エツジの張力が低下した。そこでエツジ近傍の張力を第
４図（イ）と同レベルに上げるためチー、ｏ−長さＳｗ
を約８０＋＋ｍに長くすると、第３図ｒつで示す如くエ
ツジアップを大きくさせることができた。However, when the crown of the steel plate on the entry side is changed from 2% convexity to 3% convexity, the edge-up decreases as shown in Figure 3 (b), and at the same time the tension increases especially at the edge as shown in Figure 4 (b). tension decreased. Therefore, in order to increase the tension near the edge to the same level as in Fig. 4 (a),
By increasing the length to about 80++ m, it was possible to increase the edge up as shown in Figure 3 (r).
次に、本発明の実施例を従来例と比較した。４重５スタ
ンド冷間圧延機の１号スタンドに前述の片テーパぐ−ワ
ークロールを組込み、仕上厚が０．５〜１．０ｍ＋の軟
鋼をチーノミ一部圧延長さＳｗが５０關の一定の条件で
圧延したところ、１号スタンドの圧延長さ１００００ｍ
当シフ回の破断が発生し、５スタンＰ圧延後鋼板のエツ
ジよシ１５目点のセンターに対する板厚偏差の平均値は
１．５％（σ＝０．３）であった。一方、同様の圧延機
の１号スタンｒ出側の被圧延鋼板のエツジから５＋ｗを
起点として２０順の間隔の張力を測定し、その張力が破
断応力の７５％になるようチーＡ一部圧延長さＳｗを調
整したところ、１号スタンドの圧延長さ１００００ｍ当
シ板破断は１回と少く、５スタンＰ圧延後鋼板のエツジ
よ［１５ｆ１点のセンターに対する板厚偏差は０．８％
（σ−０，２）に向上した。Next, the embodiment of the present invention was compared with a conventional example. The above-mentioned single taper work roll was installed in the No. 1 stand of a 4-layer, 5-stand cold rolling mill, and mild steel with a finishing thickness of 0.5 to 1.0 m was rolled at a constant rolling length Sw of 50 degrees. When rolled under the following conditions, the rolling length of stand No. 1 was 10,000 m.
Fracture occurred during this shift cycle, and the average value of the plate thickness deviation from the center of the 15th point from the edge of the steel plate after 5-stan P rolling was 1.5% (σ = 0.3). On the other hand, from the edge of the rolled steel plate on the exit side of No. 1 stan R of a similar rolling mill, the tension was measured at intervals of 20 in order starting from 5+w, and a part of the steel plate A was pressed so that the tension was 75% of the breaking stress. When the extension length Sw was adjusted, the plate breakage was as few as once per rolling length 10,000 m of the No. 1 stand, and the plate thickness deviation from the center of the 15f 1 point was 0.8% at the edge of the steel plate after rolling in the 5th stand P.
(σ-0,2).
（発明の効果）
本発明を適用することによシ、エツジＰロツゾの小さい
鋼板を板破断が少く安定して圧延することができる。(Effects of the Invention) By applying the present invention, it is possible to stably roll a steel plate with a small edge P-rotuosity with less plate breakage.
第１図は本発明の詳細な説明する概要図、第２図は本発
明法に使用するテーパソーワークロールを組み込んだ４
重圧延機のロール構成を説明する概要図、
第３図及び第４図は本発明の詳細な説明する被圧延板の
幅方向のクラウンと張力分布を示す図である。
Ｓ・・・ストリップ、ｌ−・テーパーワークロール、２
・・・ノ々ツクアツゾロール、３・・・張力測定器、４
・・・演算制御装置。
代理人 弁理士 秋 沢 政 光
他２名
井２０
？
Ｓｗ ５ ←今
父
Ｉ Ｄ２
一÷−−→−
、ｔ３図
Ωルエｘ １００ 皺圧餌のエツジ力゛らの
距離（ｍｌＴＬ）１ −コ
；−−１ 、Ｓｄテーパー郁圧延滉さFig. 1 is a schematic diagram explaining the present invention in detail, and Fig. 2 is a four-wheel drive system incorporating a tapered saw work roll used in the method of the present invention.
A schematic diagram illustrating the roll configuration of a heavy rolling mill, and FIGS. 3 and 4 are diagrams showing the crown and tension distribution in the width direction of a rolled plate to explain the present invention in detail. S...Strip, l-/taper work roll, 2
... Nonotsuku Atsuzo Roll, 3 ... Tension measuring device, 4
...Arithmetic control device. Agent: Patent attorney Masaaki Akizawa, 20 others? Sw 5 ← Now father I D2 1 ÷ − − → − , t3 figure Ω Lue x 100 Distance between edge force of wrinkle pressure bait (mlTL) 1 −ko; −−1 , Sd taper distance rolling strength
Claims (1)
ークロールを上下交互に組込みロール軸方向に移動可能
とした圧延機で圧延するに当り、被圧延板の縁部近傍に
張力測定器を配設し、該張力測定器で求めた被圧延板の
縁部近傍の張力値が一定になるように被圧延板の縁部に
接するワークロールのテーパー長さを調整することを特
徴とするストリップの圧延形状制御方法。(1) During rolling in a rolling mill that incorporates a pair of work rolls whose diameters are gradually reduced at one end of the roll body, alternately up and down, and is movable in the axial direction of the rolls, a tension measuring device is installed near the edge of the rolled sheet. is arranged, and the taper length of the work roll in contact with the edge of the rolled plate is adjusted so that the tension value near the edge of the rolled plate determined by the tension measuring device is constant. Method for controlling rolling shape of strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61032126A JPS62192205A (en) | 1986-02-17 | 1986-02-17 | Method for controlling rolling shape of strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61032126A JPS62192205A (en) | 1986-02-17 | 1986-02-17 | Method for controlling rolling shape of strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62192205A true JPS62192205A (en) | 1987-08-22 |
Family
ID=12350189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61032126A Pending JPS62192205A (en) | 1986-02-17 | 1986-02-17 | Method for controlling rolling shape of strip |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62192205A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997049506A1 (en) * | 1996-06-26 | 1997-12-31 | Siemens Aktiengesellschaft | Process and device for reducing the edge drop of a laminated strip |
| JP2007105787A (en) * | 2005-10-17 | 2007-04-26 | Nippon Steel Corp | Rolling machine and rolling method |
| JP2019141874A (en) * | 2018-02-20 | 2019-08-29 | Ｊｆｅスチール株式会社 | Cold rolling method of metal strip |
-
1986
- 1986-02-17 JP JP61032126A patent/JPS62192205A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997049506A1 (en) * | 1996-06-26 | 1997-12-31 | Siemens Aktiengesellschaft | Process and device for reducing the edge drop of a laminated strip |
| JP2007105787A (en) * | 2005-10-17 | 2007-04-26 | Nippon Steel Corp | Rolling machine and rolling method |
| JP2019141874A (en) * | 2018-02-20 | 2019-08-29 | Ｊｆｅスチール株式会社 | Cold rolling method of metal strip |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3121471B2 (en) | Rolling mill and rolling method | |
| KR950001805B1 (en) | Process for edge drop control in cold rolling | |
| CN113732063A (en) | Method and device for embossing rolled strip | |
| JPS62192205A (en) | Method for controlling rolling shape of strip | |
| US11413669B2 (en) | Locally changing the roll gap in the region of the strip edges of a rolled strip | |
| JP2000280015A (en) | Method and equipment to control meandering of hot- rolled sheet steel strip | |
| JPH0318411A (en) | Cold rolling method of excellent ability of shape control | |
| JPH08108208A (en) | Pinch roll equipment for sheet manufacturing/processing line and its controller | |
| JPH05277533A (en) | Method for controlling surface roughness of steel plate in temper rolling | |
| JP3591477B2 (en) | Rolling method | |
| JPS6277110A (en) | Dimension and shape straightening apparatus for hot rolling steel plate | |
| JP4830255B2 (en) | Method for manufacturing hat-shaped steel sheet pile having asymmetrical joint and claw bending apparatus used therefor | |
| JP3196990B2 (en) | Adjustment method of mill rigidity in rolling mill | |
| JPS623816A (en) | High draft rolling method | |
| JPS61154709A (en) | Device for controlling thickness profile of sheet stock | |
| JP2510049B2 (en) | Rolling mill edge drop control method | |
| JP3380130B2 (en) | Looper control method for finishing mill | |
| JPS62244513A (en) | Control method for plate thickness in continuous rolling mill | |
| KR950016915A (en) | Shape control method of ultrathin material in continuous cold rolling mill | |
| JPH0527688B2 (en) | ||
| JPH01178306A (en) | Method and device for rolling | |
| JPH0459110A (en) | Control method of crown in cold rolling | |
| JPH03161107A (en) | Method and device for temper rolling | |
| JPH11179411A (en) | Method for controlling shape of plate and edge drop in plate rolling | |
| JP4221812B2 (en) | Metal plate shape control method |