JPH06102203B2 - Rolling method for cold rolled steel strip - Google Patents
Rolling method for cold rolled steel stripInfo
- Publication number
- JPH06102203B2 JPH06102203B2 JP30873888A JP30873888A JPH06102203B2 JP H06102203 B2 JPH06102203 B2 JP H06102203B2 JP 30873888 A JP30873888 A JP 30873888A JP 30873888 A JP30873888 A JP 30873888A JP H06102203 B2 JPH06102203 B2 JP H06102203B2
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- roughness
- stand
- load
- cold
- 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
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- Metal Rolling (AREA)
Description
【発明の詳細な説明】 [産業上の利用分野] この発明は冷延鋼帯の圧延方法に関するものである。TECHNICAL FIELD The present invention relates to a method for rolling a cold rolled steel strip.
[従来の技術] タンデムミルにおいて各スタンドの出側板厚の決定は、
圧延方法を決定する際重要な要素となる。各スタンドの
出側板厚の決定方法は種々の方法があるが、何を評価関
数として選ぶかが重要である。従来から使用されている
評価関数としては、例えば特開昭60-166112号公報の如
く、各スタンドのモータ負荷配分あるいは各スタンドの
伸び率配分・各スタンドの圧延荷重配分・圧延可能最高
速度・材料の形状・通板性等が考えられる。[Prior Art] Determining the outlet plate thickness of each stand in a tandem mill
It is an important factor when determining the rolling method. There are various methods for determining the outlet plate thickness of each stand, but what is selected as an evaluation function is important. As an evaluation function that has been conventionally used, for example, as disclosed in Japanese Patent Laid-Open No. 60-166112, the motor load distribution of each stand or the elongation rate distribution of each stand, the rolling load distribution of each stand, the maximum rolling speed, and the material The shape and threadability are considered.
しかして、最終スタンドにダル加工されたワークロール
を用いて冷間圧延し鋼板に粗度を付ける圧延方法におい
て、前述した評価関数にて各スタンドの出側板厚を決定
する場合、板粗度は一定にならず材料の寸法や材質、最
終スタンドワークロール組替後の累積圧延量により、鋼
板の粗度にかなり大きなばらつきを生じていた。鋼板粗
度のばらつきは、冷延鋼板の品質に影響を与えるため、
最終スタンドに組込んだワークロールのダル加工後の累
積圧延量の規制を行い、粗度のばらつきを抑えている。Then, in the rolling method of cold-rolling using a work roll dulled to the final stand to give a roughness to the steel plate, when the exit side plate thickness of each stand is determined by the evaluation function described above, the plate roughness is It was not constant, and the roughness of the steel sheet varied considerably depending on the size and material of the material and the cumulative rolling amount after the final stand work roll was reassembled. Since variations in steel plate roughness affect the quality of cold rolled steel plates,
The cumulative rolling amount of the work roll incorporated in the final stand after dulling is regulated to suppress the unevenness of roughness.
[発明が解決しようとする課題] バッチ焼鈍に送られる材料の場合、粗度が低過ぎる時は
焼鈍後に鋼板がタイトに密着し焼付いているため、捲戻
す時に折れ状のシワが発生し外観を著しく損なう。ま
た、粗度が高過ぎる時は焼鈍後ストリップ間は焼鈍前に
比べてルーズになるが、粗度が高過ぎるとストリップ間
の密着が殆どなくなり、焼鈍後の捲戻し時に捲締まり現
象を起こし板と板がすれ合うためひっかき状の疵が鋼板
に発生し外観品位を著しく損なう。[Problems to be Solved by the Invention] In the case of a material that is sent to batch annealing, when the roughness is too low, the steel sheet adheres tightly and seizes after annealing, so creases appear when rewinding and the appearance Remarkably damages. If the roughness is too high, the space between strips after annealing becomes looser than that before annealing, but if the roughness is too high, the adhesion between strips almost disappears, causing a tightening phenomenon during unwinding after annealing. And the plate are rubbed with each other, a scratch-like flaw is generated on the steel plate, and the appearance quality is significantly impaired.
高鮮映性鋼板を製造する場合、冷間圧延後の粗度のばら
つきは調質圧延後の鋼板鮮映度に大きく影響する。しか
し、冷間圧延後の粗度ばらつきが大きく、これを抑える
ため頻繁なロール組替え・ロール粗度管理を行う必要が
あり、効率的な生産を阻害していた。When manufacturing a high-visibility steel sheet, variations in roughness after cold rolling have a great influence on the steel image clarity after temper rolling. However, there was a large variation in roughness after cold rolling, and in order to suppress this, it was necessary to frequently change rolls and manage roll roughness, which hindered efficient production.
連続焼鈍炉を通板する材料の場合、粗度が低過ぎると炉
内で板がウォークし、品質・生産能率の低下につながっ
ていた。従来は冷間圧延後の粗度のばらつきが大きく、
上記の点で問題があり改善が望まれていた。In the case of a material that passes through a continuous annealing furnace, if the roughness is too low, the board walks in the furnace, leading to a decrease in quality and production efficiency. Conventionally, there is a large variation in roughness after cold rolling,
There is a problem in the above points, and improvement is desired.
本発明は上述した問題点を解決するためなされたもの
で、タンデム冷間圧延機の最終スタンドにダル加工され
たワークロールを用いて冷間圧延し鋼板に粗度を付ける
圧延方法において、鋼板に転写される粗度が一定のレベ
ルを保ち、粗度のばらつきを抑えることができる圧延方
法を提供することを目的とする。The present invention has been made in order to solve the above-mentioned problems, in a rolling method of cold rolling using a work roll that has been dulled to the final stand of a tandem cold rolling mill to give roughness to the steel sheet, An object of the present invention is to provide a rolling method capable of keeping the transferred roughness at a constant level and suppressing variations in the roughness.
[課題を解決するための手段] 本発明は、タンデム冷間圧延機の最終スタンドにダル加
工されたワークロールをもちいて冷間圧延する際に、最
終スタンドのワークロールのダル加工後の累積圧延量に
より最終スタンドの目標圧延荷重を定めて圧延すること
を特徴とする鋼帯の冷間圧延方法である。[Means for Solving the Problems] The present invention provides a cumulative rolling after the dulling of the work rolls of the final stand when cold rolling using the work rolls dulled on the final stand of the tandem cold rolling mill. This is a cold rolling method for a steel strip, which is characterized in that a target rolling load of the final stand is determined according to the amount and rolling is performed.
即ち、本発明は圧延後の鋼板の粗度を少なくするため
に、最終スタンドの圧延荷重を圧延ロールの粗度の要件
を取り入れることに着目してなされたものである。That is, the present invention was made by paying attention to the requirement of the roughness of the rolling roll for the rolling load of the final stand in order to reduce the roughness of the rolled steel sheet.
冷延後の鋼板粗度は、素材材質、圧延油濃度等の影響を
受けるが、中でもダルロールの粗度の影響を強く受け
る。第1図に示すようにロール粗度は摩耗のために累積
圧延量とともに低下する。このため粗度を一定レベルに
保つためには、圧延荷重で表される圧延条件を累積圧延
量とともに変化させ粗度の転写率を一定に保つ必要があ
る。また硬い材料と軟らかい材料では粗度の転写のされ
方が違い、同じ転写率を得るためには圧延条件を変更す
る必要がある。ここで、累積圧延量とは累積圧延長さ、
累積圧延本数、累積圧延重量にて表される時系列的な累
積変化量である。The steel sheet roughness after cold rolling is affected by the material of the material, the concentration of rolling oil, etc., but among them, the roughness of the dull roll is strongly influenced. As shown in FIG. 1, the roll roughness decreases with the cumulative rolling amount due to wear. Therefore, in order to keep the roughness at a constant level, it is necessary to change the rolling condition represented by the rolling load together with the cumulative rolling amount to keep the transfer rate of the roughness constant. Further, the transfer method of roughness is different between the hard material and the soft material, and it is necessary to change the rolling conditions to obtain the same transfer rate. Here, the cumulative rolling amount is the cumulative rolling length,
It is a time-series cumulative change amount represented by a cumulative number of rollings and a cumulative rolling weight.
[発明の詳細] 以下発明の内容を5スタンドを例に詳細に説明する。[Details of the Invention] The contents of the invention will be described in detail below by taking five stands as an example.
鋼板粗度を一定にするために圧延条件として鋼板の単位
巾当たりの5スタンド目標圧延荷重Prを鋼種毎に設定す
る。このような目標荷重の設定方法の具体例を以下に示
す。In order to keep the steel plate roughness constant, a 5-stand target rolling load Pr per unit width of the steel plate is set as a rolling condition for each steel type. A specific example of such a method of setting the target load is shown below.
Lを5スタンドのワークロールのダル加工後の累積圧延
量、hは冷延厚とする5スタンド目標圧延荷重Prは となる。ここで、ain、binは鋼種毎に決定される係数
を示す。L is the cumulative rolling amount of the five-stand work roll after dulling, h is the cold-rolled thickness, and the five-stand target rolling load Pr is Becomes Here, a in and b in represent coefficients determined for each steel type.
圧延荷重の数式モデル計算値Pは一般的に次式で表され
る。The mathematical model calculation value P of the rolling load is generally represented by the following formula.
ここで、Bは圧延材料の板巾、Kは圧延材料の変形抵
抗、R′は偏平ロール半径、Hは5スタンド入側板厚、
hは5スタンド出側板厚、Qpは圧下力関数を示す。 Here, B is the strip width of the rolled material, K is the deformation resistance of the rolled material, R'is the flat roll radius, H is the plate thickness on the 5 stand side,
h is the thickness of the 5 stand stand-out side plate, and Qp is the rolling force function.
上記(2)式の圧下力関数Qpを表す式として、次式に示
すHillの式がある。As an expression representing the rolling force function Qp in the above expression (2), there is a Hill expression shown below.
ここで、μは摩擦係数、rは5スタンド圧下率を示す。 Here, μ represents a friction coefficient, and r represents a 5-stand rolling reduction.
偏平ロール半径R′はヒッチコックのロール偏平式よ
り、 R′=R{1+16・(1−ν2)・ P/(π・E・B・(H−h))} (4) ここで、Rはワークロール半径、Eはワークロールのヤ
ング率、νはワークロールのポアソン比を示す。The flat roll radius R ′ is R ′ = R {1 + 16 · (1-ν 2 ) · P / (π · E · B · (H−h))} (4) where: R is the work roll radius, E is the work roll Young's modulus, and ν is the work roll Poisson's ratio.
(3)式に(1)、(4)式を代入し、次式のように変
数Hの方程式とする。By substituting the equations (1) and (4) into the equation (3), the equation of the variable H is obtained as in the following equation.
(5)式は非線型であるためニュートン・ラフソン法に
よりHを求める。5スタンドの圧下率は次式により決定
される。 Since equation (5) is non-linear, H is obtained by the Newton-Raphson method. The rolling reduction of the five stands is determined by the following equation.
r=1−h/H (6) 以上のように圧延後の鋼板の粗度を目標値とすべく、最
終スタンドの圧延荷重を決定する。このように最終スタ
ンドの圧延荷重を決定し冷間圧延することによって、鋼
板の粗度のばらつきを抑えることができる。このため、
圧延能率・作業性を損なわずに、鋼板粗度を一定に圧延
することが可能となる。このような圧延スケジュール計
算の流れ図を第2図に示す。r = 1-h / H (6) As described above, the rolling load of the final stand is determined so that the roughness of the rolled steel sheet becomes the target value. By thus determining the rolling load of the final stand and performing cold rolling, it is possible to suppress variations in the roughness of the steel sheet. For this reason,
It is possible to roll the steel plate at a constant roughness without impairing the rolling efficiency and workability. A flow chart of such rolling schedule calculation is shown in FIG.
[実施例] 累積圧延量に累積圧延長さ、目標圧延条件として目標圧
延荷重を用いた場合の実施例を第3図に示す。板厚0.5
〜3.2mm、板巾700〜1600mmのアルミキルド鋼を第3図に
示す如く、本発明方法により圧延荷重を決定し、圧延を
行なった。比較例として従来法の最終厚みを考慮して圧
延荷重を決定し各々200本圧延を行なった。発明実施前
と後の設定圧延荷重を比較する。本発明により、目標圧
延荷重に従った圧延が可能となり、第4図に示すよう
に、鋼板に転写される粗度がバラツキの少ないレベルを
保てるようになり、最終スタンドの圧延長の影響もない
ことがわかる。[Example] Fig. 3 shows an example in which a cumulative rolling length is used as a cumulative rolling amount and a target rolling load is used as a target rolling condition. Thickness 0.5
As shown in FIG. 3, aluminum-killed steel having a width of .about.3.2 mm and a plate width of 700 to 1,600 mm was rolled by determining the rolling load according to the method of the present invention. As a comparative example, the rolling load was determined in consideration of the final thickness of the conventional method, and 200 strips were rolled. The set rolling load before and after carrying out the invention is compared. According to the present invention, rolling can be performed according to the target rolling load, and as shown in FIG. 4, the roughness transferred to the steel sheet can be maintained at a level with little variation, and there is no effect of the rolling length of the final stand. I understand.
[発明の効果] 本発明により鋼板に転写される粗度が、圧延状況によら
ず一定のレベルを保つようになる。このため、鋼板粗度
のばらつきが原因とされるバッチ焼鈍での折れ状のシワ
・ひっかき状の疵が従来法により圧延した時と比較して
減少し、高鮮映性鋼板については粗度レベルが一定とな
り鮮映度の高い製品の製造が可能となる。[Advantages of the Invention] According to the present invention, the roughness transferred to the steel sheet maintains a constant level regardless of the rolling condition. Therefore, the creases and scratches in the batch annealing due to the variation in the roughness of the steel sheet are reduced as compared with the case of rolling by the conventional method, and the roughness level is high for the high image clarity steel sheet. Will be constant, and it will be possible to manufacture products with high image clarity.
第1図は圧延長によるロール粗度・最終スタンド圧延荷
重・最終スタンド圧下率を示である。第2図は粗度一定
圧延時の圧延スケジュール計算例の流れ図を示す。第3
図は粗度一定圧延実施時の計算荷重・実績荷重・粗度一
定圧延実施前の圧延長による最終スタンドの荷重を示
す。第4図は本発明と従来法とで比較した鋼板粗度のば
らつきを示した図である。FIG. 1 shows the roll roughness, the final stand rolling load, and the final stand reduction rate according to the rolling length. FIG. 2 shows a flow chart of an example of rolling schedule calculation during rolling with a constant roughness. Third
The figure shows the calculated load, the actual load, and the load of the final stand due to the rolling length before the constant roughness rolling is carried out. FIG. 4 is a diagram showing variations in steel plate roughness compared between the present invention and the conventional method.
Claims (1)
加工されたワークロールをもちいて冷間圧延する際に、
最終スタンドのワークロールのダル加工後の累積圧延量
により、最終スタンドの目標圧延荷重を定めて圧延する
ことを特徴とする、鋼帯の冷間圧延方法。1. When cold rolling using a dull-worked work roll on the final stand of a tandem cold rolling mill,
A cold-rolling method for a steel strip, characterized in that a target rolling load of the final stand is set and rolled according to the cumulative rolling amount of the work roll of the final stand after the dull processing.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30873888A JPH06102203B2 (en) | 1988-12-08 | 1988-12-08 | Rolling method for cold rolled steel strip |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30873888A JPH06102203B2 (en) | 1988-12-08 | 1988-12-08 | Rolling method for cold rolled steel strip |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02155501A JPH02155501A (en) | 1990-06-14 |
JPH06102203B2 true JPH06102203B2 (en) | 1994-12-14 |
Family
ID=17984691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30873888A Expired - Lifetime JPH06102203B2 (en) | 1988-12-08 | 1988-12-08 | Rolling method for cold rolled steel strip |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH06102203B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5293403B2 (en) * | 2009-05-27 | 2013-09-18 | 新日鐵住金株式会社 | Cold rolling method using dull work rolls |
-
1988
- 1988-12-08 JP JP30873888A patent/JPH06102203B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH02155501A (en) | 1990-06-14 |
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