JP2749705B2 - Plate shape control method during cold rolling - Google Patents
Plate shape control method during cold rollingInfo
- Publication number
- JP2749705B2 JP2749705B2 JP2136358A JP13635890A JP2749705B2 JP 2749705 B2 JP2749705 B2 JP 2749705B2 JP 2136358 A JP2136358 A JP 2136358A JP 13635890 A JP13635890 A JP 13635890A JP 2749705 B2 JP2749705 B2 JP 2749705B2
- Authority
- JP
- Japan
- Prior art keywords
- plate
- rolling
- cold rolling
- shape
- elongation
- 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 - Lifetime
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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
- B21B45/0275—Cleaning devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は金属材料の冷間圧延に関し、特に冷間圧延時
の板形状を良好にするものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to cold rolling of metal materials, and more particularly to improving the shape of a sheet during cold rolling.
従来このような金属板の冷間圧延としては、例えばア
ルミ板の冷間圧延がある。そこで以下、この例について
説明する。Al板圧延材に要求される品質としては、金属
的特性，表面性状、寸法精度および形状が挙げられる。
ここで形状とは板の平坦度をいい、フラットネスと称さ
れることもある。このうち形状に関しては、ユーザー要
求を満たす事は当然として、冷間圧延時の板切れ防止及
び圧延速度向上といった生産性向上の点からも良好に保
つ必要がある。従来これらの点に対処するには、以下の
方法がとられている。Conventionally, such cold rolling of a metal plate includes, for example, cold rolling of an aluminum plate. Therefore, this example will be described below. The quality required for the rolled aluminum sheet includes metallic properties, surface properties, dimensional accuracy, and shape.
Here, the shape refers to the flatness of the plate, and may be referred to as flatness. Of these shapes, it is necessary to keep the shape well in terms of productivity improvement such as prevention of sheet breakage during cold rolling and improvement of rolling speed, as well as satisfying user requirements. Conventionally, the following methods have been adopted to address these points.
１）上下の作業ロール（以下WR）にロールベンディング
力（以下WRB）を付与したり、あるいは中間ロール（以
下IMR）を軸方向に移動させる方法。1) A method of applying a roll bending force (WRB) to upper and lower work rolls (WR) or moving an intermediate roll (IMR) in an axial direction.
しかしこれは全てWRの曲げたわみを利用するものであ
り、板巾方向の中央部又は端部単独に生ずるいわゆる単
純伸びの制御にのみ有効である。However, all of these methods use the bending deflection of the WR, and are effective only for controlling the so-called simple elongation that occurs only at the center or the end in the sheet width direction.
２）単純伸び以外の1/4伸び,1/8伸び等のいわゆる局部
伸びを防止する方法として、WRの冷却水量を巾方向に調
整して、WR熱膨張量を制御する方法。2) As a method of preventing so-called local elongation such as 1/4 elongation and 1/8 elongation other than simple elongation, a method of controlling the amount of WR thermal expansion by adjusting the amount of WR cooling water in the width direction.
３）特開昭59−174208号公報に記載されている様に、圧
延機入側に濃度の異なる圧延油を別個に供給するための
圧延油供給装置を２種類以上設け、巾方向の板とWR間の
摩擦係数を制御する方法。3) As described in JP-A-59-174208, two or more types of rolling oil supply devices for separately supplying rolling oils having different concentrations are provided on the inlet side of a rolling mill, and a plate in the width direction is provided. A method of controlling the coefficient of friction between WRs.
しかし、上記従来技術の場合、以下に示す問題点が挙
げられる。However, the conventional technique has the following problems.
前記１）の場合 単純伸びに対してのみ有効であり、局
部伸びに対する効果はない。又、装置の初期コストが高
くつく。In the case of the above 1), it is effective only for simple elongation, and has no effect on local elongation. Also, the initial cost of the device is high.
２）の場合 局部伸びに対してある程度有効である
が、流量調整量のオンオフバルブあるいは流量調整弁を
備える必要がある為、装置コストのアップあるいは装置
の維持費用が高くなる。又、局部伸びを完全に防止する
事はできない。In the case of 2), it is effective to some extent against local elongation, but it is necessary to provide an on / off valve for adjusting the flow rate or a flow rate adjusting valve, so that the cost of the apparatus increases or the maintenance cost of the apparatus increases. Further, local elongation cannot be completely prevented.
３）の場合 アルミ冷延ではWR冷却液として鉱物油
をそのまま使用するのが一般的であり、冷却液の濃度を
変更する事は不可能である。即ちアルミ冷延には適用出
来ない。又、板に出来たとしても装置コストがアップす
る。In the case of 3) In aluminum cold rolling, it is common to use mineral oil as it is as the WR coolant, and it is not possible to change the concentration of the coolant. That is, it cannot be applied to aluminum cold rolling. Further, even if it is made of a plate, the cost of the apparatus increases.
本発明はこれに鑑み検討し、圧延時の板形状を良好に
保つ方法を提供するものである。The present invention has been made in view of the above and provides a method for maintaining a good shape of a sheet during rolling.
即ち本発明は、金属材料の冷間板圧延において、最終
パスまでに少なくとも１回以上、pH10以上のアルカリ溶
液にて１〜30秒間アルカリ洗浄を圧延板の巾方向に均一
又は不均一に行うことを特徴とするものである。That is, in the present invention, in the cold rolling of a metal material, at least one time before the final pass, alkali washing with an alkaline solution having a pH of 10 or more for 1 to 30 seconds is performed uniformly or unevenly in the width direction of the rolled sheet. It is characterized by the following.
このように本発明は、冷間板圧延において、最終圧延
前の板をエッチングする際、巾方向にエッチング量を調
整する事を特徴とするものである。As described above, the present invention is characterized in that, in cold plate rolling, when etching a plate before final rolling, the amount of etching is adjusted in the width direction.
これは本発明者らが、圧延板の形状制御法について系
統的に研究を行って得た以下の知見に基づくものであ
る。This is based on the following findings obtained by the present inventors through systematic research on a method for controlling the shape of a rolled sheet.
第１図に従来条件でアルミ板を冷間圧延したときの圧
延時の板の出側形状をその巾方向で示す。この線図は圧
延機出側に設けられた形状検出器によるものである。こ
の第１図によれば、板巾の約1/8の部分が他の部分に比
較して局部的に伸びていることが解る。そこでこのよう
な形状となる現象を、通常1/8伸びと呼んでいる。FIG. 1 shows the shape of the exit side of the aluminum plate in the width direction when cold rolling is performed on an aluminum plate under conventional conditions. This diagram is based on a shape detector provided on the exit side of the rolling mill. According to FIG. 1, it can be seen that a portion of about 1/8 of the plate width is locally extended as compared with other portions. Therefore, the phenomenon of such a shape is usually called 1/8 elongation.
この1/8伸びの原因としては、入側板のクラウン,WRの
たわみあるいは扁平形状等の多くの要因が考えられる
が、最大の要因としては圧延時ヒートクラウン形状が台
形状である事が考えられる。即ち、圧延時の材料からWR
への入熱が過大である為、WRが台形状に熱膨張し、その
肩の部分で板が相対的に多く圧下されて1/8伸びが生じ
ると考えられる。The cause of this 1/8 elongation can be considered to be many factors such as crown of entrance side plate, WR deflection or flat shape, but the biggest factor is that the heat crown shape during rolling is trapezoidal . In other words, the WR
It is considered that the WR thermally expands in a trapezoidal shape due to excessive heat input into the WR, and the plate is relatively reduced at the shoulder portion, causing 1/8 elongation.
そこで1/8伸び対策としては、ヒートクラウン形状を
適正に修正する事が行われる。即ち、WRの冷却水量を1/
8部で相対的に増加させ、1/8部の熱膨張量を極力減少さ
せる方策が取られる。Therefore, as a countermeasure against 1/8 elongation, it is necessary to correct the heat crown shape appropriately. That is, the WR cooling water amount is 1 /
Measures will be taken to increase the relative expansion in 8 parts and reduce the amount of thermal expansion in 1/8 part as much as possible.
しかしながら、本方策では、1/8伸びを完全に防止す
る事は不可能と言える。その理由は、1/8伸びを完全に
防止するだけの低温，大容量のWR冷却液を得る事は工業
的に許されるコスト内では不可能な為である。However, it can be said that this measure cannot completely prevent 1/8 growth. The reason is that it is impossible to obtain a low-temperature, large-capacity WR coolant that completely prevents 1/8 elongation, within the cost of industrially acceptable costs.
このため本発明者らは、別の1/8伸び防止方法を検討
した。Therefore, the present inventors have studied another 1/8 elongation prevention method.
JIS A 1100Al合金のＯ材を圧延の出側厚さ0.3mmとす
る冷間圧延を施す際に、板に後述の第１表の条件でアル
カリ洗浄を行なったものと、アルカリ洗浄を行なわない
ものとの圧延荷重の違いを第２図に示した。図より明ら
かにアルカリ洗浄を行なうと圧延荷重が大きいことがわ
かる。When cold rolling the JIS A 1100Al alloy O material to the thickness 0.3 mm on the exit side of rolling, the plate is subjected to alkali cleaning under the conditions shown in Table 1 below, and the plate is not subjected to alkali cleaning FIG. 2 shows the difference between the rolling loads. It is apparent from the figure that the rolling load is large when alkali cleaning is performed.
この現象を圧延理論により考察すると以下のことが明
らかである。先ず圧延荷重Prは次の，式により表わ
される。Considering this phenomenon by the rolling theory, the following is clear. First, the rolling load Pr is expressed by the following equation.
km ：変形抵抗 Ｒ′：扁平ロール半径 Δh:圧下量 Qp ：圧下力関数 Qp＝ｆ（μ，Δｈ） … μ ：ロールと板との摩擦係数 ここでアルカリ洗浄を行うと圧延荷重が増加する理由
として、以下のことが考えられる。 km: Deformation resistance R ': Flat roll radius Δh: Rolling amount Qp: Rolling force function Qp = f (μ, Δh) ... μ: Coefficient of friction between roll and plate Reason why alkali washing increases rolling load The following can be considered.
ロールと板間の摩擦係数μは、圧延板の表面状態の影
響を受け、一般的には表面が粗い方がμは大きいと言え
る。The coefficient of friction μ between the roll and the plate is affected by the surface condition of the rolled plate. Generally, it can be said that μ is larger when the surface is rougher.
そこで、圧延前の板をアルカリ洗浄する事により板表
面が粗面化し、その影響でμが増加し、その結果Qpが増
加し圧延荷重が増加すると考えられる。Therefore, it is considered that the surface of the plate before rolling is alkali-cleaned to make the surface of the plate rough, which increases μ, and as a result, Qp increases and the rolling load increases.
次に出側板圧ｈをゲージメーター式で表わすと式で
表わされる。Next, when the delivery side plate pressure h is represented by a gauge meter formula, it is represented by a formula.
So:ギャップ設定値 k :ミルバネ Co:ロール熱膨張量補正値 ここで右辺第２項は荷重による圧延機の弾性変形量を
示す。 So: Gap setting value k: Mill spring Co: Roll thermal expansion correction value Here, the second term on the right side indicates the amount of elastic deformation of the rolling mill due to load.
この状態を模式的に示したのが第３図である。即ち第
３図に示すように上WR（１）と下WR（２）との間隙量を
Soとして、この間隙で金属板（３）を圧延する際に、圧
延機の弾性変形量は大部分がロールの扁平変形により生
じていると考えられる。FIG. 3 schematically shows this state. That is, as shown in FIG. 3, the gap between the upper WR (1) and the lower WR (2) is
When the metal plate (3) is rolled in this gap as So, it is considered that the elastic deformation of the rolling mill is mostly caused by the flat deformation of the roll.
従って式より、巾方向の荷重分布を調整できれば、
それに伴って、出側巾方向板厚分布が調整できると考え
られる。Therefore, if the load distribution in the width direction can be adjusted from the formula,
Accordingly, it is considered that the thickness distribution in the outlet side width direction can be adjusted.
そこで、前述，式より、WR,板間のμを巾方向に
調整すれば、巾方向出側板厚、即ち出側板形状を調整で
きると考えられる。Therefore, it is considered from the above equation that if the WR and μ between the plates are adjusted in the width direction, the width in the width direction, ie, the shape of the outlet plate, can be adjusted.
以上の考察より、本発明者らは、圧延前の板を巾方向
にパターンを設けてアルカリエッチングする実験を行っ
た。From the above considerations, the present inventors conducted an experiment in which a plate before rolling was subjected to alkali etching by providing a pattern in the width direction.
即ち、第１図に示す1/8伸びを示す板に対して、その1
/8伸び部のみを長手方向にエッグした場合の板の出側形
状を第４図（ａ）に示し、同様の板に対して、その中央
部のみを長手方向にエッチングした場合の出側形状を第
４図（ｂ）に示し、また同じ板に対して巾方向全体を長
手方向に均一にエッチングした後上記1/8伸び部を更に
強くエッチングした場合の出側の形状を第４図（ｃ）に
示した。That is, as compared with the plate showing 1/8 elongation shown in FIG.
FIG. 4 (a) shows the outgoing shape of the plate when only the / 8 extension portion is egg-lengthened, and the outgoing shape when only the center portion of the same plate is etched in the longitudinal direction. Fig. 4 (b) shows the shape of the outlet side when the above-mentioned 1/8 extension is further etched more evenly in the entire width direction with respect to the same plate in the longitudinal direction, and Fig. 4 (b). c).
第４図（ａ）〜（ｃ）より明らかに、アルカリエッチ
ングを行った部分は、行わなかった部分に比較して、出
側形状が伸びにくい事がわかる。4 (a) to 4 (c), it is apparent that the portion on which alkali etching has been performed is less likely to have an elongated shape on the outlet side than the portion on which alkali etching has not been performed.
以上より、冷延時に1/8伸びが発生する場合、それを
防止する為には、圧延前に1/8部をアルカリエッチング
して入側板の1/8部を粗面化する必要があると言える。From the above, when 1/8 elongation occurs during cold rolling, it is necessary to roughen 1/8 part of the entry side plate by alkali etching 1/8 part before rolling in order to prevent it It can be said.
当然1/8伸び以外の例えば、中伸びが発生する場合
は、その対策としては圧延前に板巾中央部を粗面化する
事が有効である。Naturally, if medium elongation other than 1/8 elongation occurs, for example, as a countermeasure, it is effective to roughen the center of the sheet width before rolling.
ただし、アルカリ洗浄をあまり長時間行うと板表面の
粗度が大きくなりすぎて、最終パス後の板表面が光沢を
失うので、適度な洗浄条件を設定する必要がある。However, if the alkali cleaning is performed for an excessively long time, the roughness of the plate surface becomes too large, and the plate surface after the final pass loses gloss. Therefore, it is necessary to set appropriate cleaning conditions.
そこでアルカリ洗浄条件であるが、本発明でアルカリ
洗浄を行う温度は15〜90℃の範囲で十分であり、用いる
アルカリはNaOH,KOH,Ca（OH）２等を用いればよいが、
特に0.3〜10％のNaOHを使用し５〜60秒の範囲で処理す
る事が望ましい。Therefore, alkali cleaning conditions are as follows. The temperature at which alkali cleaning is performed in the present invention is sufficiently in the range of 15 to 90 ° C., and the alkali used may be NaOH, KOH, Ca (OH) 2, etc.
In particular, it is desirable to use 0.3 to 10% NaOH for a treatment in the range of 5 to 60 seconds.
アルカリ洗浄を行うパスは理想的には冷間圧延時１パ
ス目から最終パス前迄全パス行うのが望ましい。Ideally, all passes of the alkali cleaning are performed from the first pass to the last pass during cold rolling.
しかし、実際的にはサイドシフトの発生し易い最終パ
ス前で行うのが、コスト的に最も有利である。However, in practice, it is the most advantageous in terms of cost to perform it before the final pass where the side shift is likely to occur.
又、巾方向の洗浄パターンは、圧延機の特性及び材料
の巾，厚さ，硬さにより異なるが、一般的には1/8〜1/4
部を強く洗浄するパターンが望ましい。The cleaning pattern in the width direction varies depending on the characteristics of the rolling mill and the width, thickness and hardness of the material, but is generally 1/8 to 1/4.
A pattern that strongly cleans the part is desirable.
なお本発明では素材の粗面化方法としてアルカリ洗浄
のみを示したが、他の化学的処理例えば、酸エッチング
でも同様の効果が得られる。又電解エッチング等の電気
化学的処理及びショットブラスト等物理的処理も同様で
ある。In the present invention, only alkali cleaning is shown as a method for roughening a material, but the same effect can be obtained by other chemical treatments such as acid etching. The same applies to electrochemical processing such as electrolytic etching and physical processing such as shot blasting.
又、潤滑状態の変化法として素材の粗面化に注目した
が、素材表面酸化膜の除去による新生面の発生も同様の
効果をもたらす。Although attention has been paid to the roughening of the material as a method of changing the lubricating state, the generation of a new surface by removing the oxide film on the material surface has the same effect.
又、アルカリ洗浄も全長にわたって行うのが望ましい
が、コスト的に問題があれば１部を省略する事も考えら
れる。Also, it is desirable that the alkali cleaning be performed over the entire length, but if there is a problem in cost, one part may be omitted.
次に本発明の実施例を説明する。 Next, examples of the present invention will be described.
JIS A 1100Al合金Ｏ材を板厚0.6mmから板厚0.3mmに冷
間圧延するに際し、第１表に示す板の巾方向の洗浄位置
に対して同じく第１表に示す条件でアルカリ洗浄を実施
して、その最終圧延板の板形状の評価と板表面の光沢の
程度を調べ、これらの結果を第１表に示した。なおアル
カリ洗浄しない従来例についても調査してその結果を第
１表に併記した。When cold rolling JIS A 1100Al alloy O material from 0.6mm thickness to 0.3mm thickness, alkali cleaning was performed on the cleaning position in the width direction of the plate shown in Table 1 under the same conditions as shown in Table 1. Then, the evaluation of the plate shape of the final rolled plate and the degree of gloss on the plate surface were examined. The results are shown in Table 1. In addition, a conventional example in which alkali washing was not performed was also investigated, and the results are also shown in Table 1.
第１表より明らかに本発明法によれば板形状の優れた
Al圧延板が得られる。 Table 1 clearly shows that according to the method of the present invention, the plate shape is excellent.
An Al rolled plate is obtained.
本発明によれば、比較的低コストで冷間圧延時の板形
状と表面品質とを良好に保つことができる等顕著な効果
を奏する。ADVANTAGE OF THE INVENTION According to this invention, a remarkable effect is produced, such as being able to maintain the favorable plate shape and surface quality at the time of cold rolling at relatively low cost.
第１図は、従来の冷間圧延板の巾方向の出側形状を示す
線図、第２図はアルカリ洗浄の有無による圧延荷重の違
いを示す線図、第３図（ａ）（ｂ）は圧延機ロールを示
すもので（ａ）は無負荷時の正面図、（ｂ）は有負荷時
の正面図、第４図（ａ）〜（ｃ）はそれぞれ本発明法を
用いた場合の冷間圧延板の巾方向の出側形状を示す線図
である。 １……上作業ロール ２……下作業ロール ３……板FIG. 1 is a diagram showing the shape of the exit side in the width direction of a conventional cold-rolled sheet, FIG. 2 is a diagram showing the difference in rolling load depending on the presence or absence of alkali washing, and FIGS. 3 (a) and 3 (b). (A) is a front view at the time of no load, (b) is a front view at the time of load, and FIGS. 4 (a) to (c) each show a case where the method of the present invention is used. It is a diagram which shows the shape of the exit side of the width direction of a cold rolling plate. 1 ... upper work roll 2 ... lower work roll 3 ... board
Claims (1)
までに少なくとも１回以上、pH10以上のアルカリ溶液に
て１〜300秒間のアルカリ洗浄を圧延板の巾方向に均一
又は不均一に行うことを特徴とする冷間圧延時の板形状
制御方法。1. In cold plate rolling of a metal material, alkali washing is performed at least once by an alkali solution having a pH of 10 or more for 1 to 300 seconds in the width direction of the rolled plate, at least once before a final pass. A sheet shape control method at the time of cold rolling, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2136358A JP2749705B2 (en) | 1990-05-25 | 1990-05-25 | Plate shape control method during cold rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2136358A JP2749705B2 (en) | 1990-05-25 | 1990-05-25 | Plate shape control method during cold rolling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0433711A JPH0433711A (en) | 1992-02-05 |
| JP2749705B2 true JP2749705B2 (en) | 1998-05-13 |
Family
ID=15173314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2136358A Expired - Lifetime JP2749705B2 (en) | 1990-05-25 | 1990-05-25 | Plate shape control method during cold rolling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2749705B2 (en) |
-
1990
- 1990-05-25 JP JP2136358A patent/JP2749705B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0433711A (en) | 1992-02-05 |
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