JPH05111716A - Method for operating roller leveler - Google Patents

Method for operating roller leveler

Info

Publication number
JPH05111716A
JPH05111716A JP27236191A JP27236191A JPH05111716A JP H05111716 A JPH05111716 A JP H05111716A JP 27236191 A JP27236191 A JP 27236191A JP 27236191 A JP27236191 A JP 27236191A JP H05111716 A JPH05111716 A JP H05111716A
Authority
JP
Japan
Prior art keywords
straightening
leveler
roll
reduction
amount
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
Application number
JP27236191A
Other languages
Japanese (ja)
Inventor
Makoto Yoshii
誠 吉井
Kazuo Omori
和郎 大森
Tsuneo Seto
恒雄 瀬戸
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.)
JFE Steel Corp
Original Assignee
Kawasaki 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 Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to JP27236191A priority Critical patent/JPH05111716A/en
Publication of JPH05111716A publication Critical patent/JPH05111716A/en
Pending legal-status Critical Current

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  • Straightening Metal Sheet-Like Bodies (AREA)

Abstract

PURPOSE:To conpensate roll wear of leveler rolls without frequently executing zero adjustment and to always exhibit sufficient straightening effect. CONSTITUTION:In straightening treatment that distortion of a thick steel plate is straightened with a roller leveler, deficient rolling reduction of the leveler rolls 1 is calculated with a process computer 7 from difference between calculated value of straightening reaction force that is generated when the optimum rolling reduction is set and actual value of straightening reaction force that is detected with load cells 6 and straightening is executed by correcting this deficiency with hydraulic rolling-down devices 5.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、熱間圧延された厚鋼板
の、圧延後の形状不良や内部残留応力を矯正・除去する
ローラーレベラーの操業方法に関し、さらに詳しくは、
レベラーロールが磨耗した場合のロール磨耗を補償する
ローラーレベラーの操業方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a roller leveler for straightening and removing defective shapes and internal residual stress of a hot-rolled thick steel plate after rolling.
The present invention relates to a method for operating a roller leveler that compensates for roll wear when the leveler roll is worn.

【0002】[0002]

【従来の技術】一般に厚鋼板を熱間で圧延すると、反
り、耳波、腹波などの形状不良や、内部残留応力などが
発生する。このため、圧延工程に引き続いてまだ鋼板が
冷却されないうちにローラーレベラーにより矯正処理が
行われる。ローラーレベラーによる矯正の原理は、複数
のレベリングロールを上下に千鳥状に配列し、この間を
通過させることにより鋼板に降伏点を越える繰り返し曲
げを与えて板各部の曲率を均一化させながら次第に曲率
を0に近づけ、形状不良を改善するとともに残留応力の
低減を図ろうとするものである。
2. Description of the Related Art Generally, when a thick steel plate is hot-rolled, a shape defect such as a warp, an ear wave, or an abdominal wave or internal residual stress occurs. For this reason, the straightening process is performed by the roller leveler before the steel plate has not been cooled following the rolling process. The principle of straightening with a roller leveler is that multiple leveling rolls are arranged in a staggered pattern up and down, and by passing between them, the steel plate is repeatedly bent beyond the yield point to make the curvature of each part of the plate uniform while gradually increasing the curvature. It aims to reduce the residual stress as well as to improve the shape defect by approaching 0.

【0003】従って、レベラーロールの圧下量として
は、図2に示すように通常入側で大きく、出側に進むに
つれて減少して出口でほぼ0となる傾動圧下方式が採用
されている。tは板厚、l はロールピッチ、δ1 は1番
目のロールの圧下量で、以後ロール番号は上下ロールを
通算して数えるものとする。矯正効果は、板を曲げたと
きの板厚方向の塑性変形の割合、すなわち表面からどの
程度の部分までが塑性域に入るかで決まり、大きな圧下
量をとるほど矯正効果も大きくなるから、レベラーの設
備能力の限度内で極力大きい圧下量をとって矯正を行う
のが普通である。
Therefore, as shown in FIG. 2, the amount of reduction of the leveler roll is usually a tilting reduction system in which it is large on the entrance side, decreases as it goes to the exit side, and becomes almost 0 at the exit. t is the plate thickness, l is the roll pitch, δ 1 is the reduction amount of the first roll, and the roll numbers are counted from the upper and lower rolls. The straightening effect is determined by the rate of plastic deformation in the plate thickness direction when the plate is bent, that is, the extent from the surface to the plastic zone.The larger the amount of reduction, the greater the straightening effect. It is usual to perform correction by taking as large a reduction amount as possible within the limits of the equipment capacity of.

【0004】一方、レベラーロールは矯正処理を行うに
つれて表面が磨耗していくので、予め設定した圧下量で
矯正を行っていても、零調整(実際のロールギャップ
と、圧下量の指示とが一致するように調整すること)か
らある程度時間が経過すると、圧下量が不足して来て、
充分な矯正効果が発揮されなくなる。零調整を頻繁に、
極端には鋼板1枚毎に行えばよいが、圧延機と違ってレ
ベラーではロールが千鳥状に配列されているため零調整
の都度ゲージプレートをロール間にはさむ必要があり、
この間ライン停止を伴うから大幅な能率低下を招いてし
まうという問題点がある。
On the other hand, since the surface of the leveler roll is worn out as it is straightened, even if straightening is performed with a preset reduction amount, zero adjustment (the actual roll gap and the instruction of the reduction amount are the same). After a certain amount of time has passed since the adjustment,
The corrective effect will not be fully exerted. Zero adjustment frequently,
Extremely, it may be done for each steel sheet, but unlike the rolling mill, the rolls are arranged in a zigzag manner on the leveler, so it is necessary to sandwich the gauge plate between the rolls at each zero adjustment.
Since the line is stopped during this period, there is a problem that the efficiency is greatly reduced.

【0005】[0005]

【発明が解決しようとする課題】本発明は、このような
問題点を解消し、頻繁に零調整を行うことなくレベラー
ロールの磨耗を補償し、常に充分な矯正効果を発揮させ
るようにしたローラーレベラーの操業方法を提供するこ
とを目的とする。
SUMMARY OF THE INVENTION According to the present invention, a roller which solves such a problem and compensates for wear of the leveler roll without frequently performing zero adjustment and always exerts a sufficient straightening effect. The purpose is to provide a method of operating a leveler.

【0006】[0006]

【課題を解決するための手段】本発明は、ローラーレベ
ラーによって厚鋼板の歪みを矯正する矯正処理におい
て、最適な圧下量を設定した時に生じる矯正反力の計算
値と、ロードセルで検出した矯正反力の実績値との差か
ら不足する圧下量を算出し、この不足分を圧下装置によ
り補正して矯正を行うことを特徴とするローラーレベラ
ーの操業方法である。
According to the present invention, in a straightening process for straightening a distortion of a thick steel plate by a roller leveler, a calculated value of a straightening reaction force generated when an optimum amount of reduction is set and a straightening reaction detected by a load cell. The roller leveler operating method is characterized in that an insufficient amount of reduction is calculated from the difference between the actual force value and the amount is corrected by a reduction device to correct the amount.

【0007】[0007]

【作 用】図3は、ローラーレベラーの零調整を行って
から、同一仕様の厚鋼板の矯正を連続して行い、零調整
後の時間の経過による矯正反力の変化を記録した一例で
ある。時間の経過とともにロール磨耗が進行し、同一の
圧下設定であっても実際の圧下量が徐々に小さくなり、
矯正反力が減少していることがわかる。
[Operation] Fig. 3 shows an example of recording changes in the straightening reaction force with the passage of time after zero adjustment, by continuously adjusting thick steel plates with the same specifications after zero adjustment of the roller leveler. .. Roll wear progresses over time, and the actual amount of reduction gradually decreases even with the same reduction setting.
It can be seen that the correction reaction force is decreasing.

【0008】このことから、同一仕様の厚鋼板に関して
は、矯正反力が常に所定の塑性変形を与える荷重となる
よう、圧下量を補正してやれば、ロール磨耗による圧下
力不足を防止できることがわかる。一般に、i番目のロ
ールにおける塑性変形の割合をηi としたとき、矯正反
力Fとの間には、次の(1)に示すような関係がある。
From the above, it is understood that, with regard to thick steel plates having the same specifications, if the amount of reduction is corrected so that the correction reaction force always gives a predetermined plastic deformation, insufficient reduction of force due to roll wear can be prevented. Generally, when the ratio of plastic deformation in the i-th roll is η i , there is a relationship with the correction reaction force F as shown in (1) below.

【0009】[0009]

【数1】 [Equation 1]

【0010】(1)によって各板の仕様に対する必要な
塑性変形の割合を決定すれば、このときの矯正反力が求
められる。また、ηi と圧下量との関係は、
If the ratio of the required plastic deformation to the specifications of each plate is determined by (1), the correction reaction force at this time can be obtained. Also, the relationship between η i and the amount of reduction is

【0011】[0011]

【数2】 [Equation 2]

【0012】で与えられ、さらに、各ロール圧下量はロ
ーラーレベラーにおいては前述したように出側最終上ロ
ールの圧下量を0とした傾動圧下を行うため、基準ロー
ル、例えば2番目のロールの圧下量δ2 により次のよう
に与えられる。
Further, in the roller leveler, since the roll leveler performs the tilting reduction with the reduction amount of the exit-side upper upper roll being 0, as described above, the reduction amount of the reference roll, for example, the second roll is reduced. The quantity δ 2 gives:

【0013】[0013]

【数3】 [Equation 3]

【0014】以上により、各板仕様毎に矯正に最適な塑
性変形の割合ηiSを設定すると、このときの最適矯正反
力FS が求められる。そこで、現在矯正中の板につい
て、矯正反力をロードセルでF’を実測し、 ΔF = FS −F’ ・・・(4) を求めれば、これが必要な塑性変形の割合に対して不足
している圧下力である。
As described above, when the optimum plastic deformation ratio η iS for straightening is set for each plate specification, the optimum straightening reaction force F S at this time is obtained. Therefore, the plate being currently corrected, the correction reaction force 'actually measured, ΔF = F S -F' F load cell by obtaining the (4), which is insufficient for the proportion of plastic deformation necessary It is the rolling force.

【0015】従って、各板の仕様毎にFS を予め計算し
ておけば、操業時にF’を実測することで瞬時にΔFの
値がわかり、(1)(2)(3)式からそれに対応する
圧下量も求められるから、油圧圧下等の圧下装置を締め
込んでやれば、ロール磨耗による圧下量の不足を補償す
ることができる。
Therefore, if F S is calculated in advance for each specification of each plate, the value of ΔF can be instantly found by actually measuring F ′ at the time of operation, and it can be found from equations (1), (2) and (3). Since the corresponding amount of reduction is also required, tightening a reduction device such as hydraulic reduction can compensate for the insufficient amount of reduction due to roll wear.

【0016】[0016]

【実施例】図1は本発明を実施したローラーレベラーの
構成を示す一例で、1はレベリングロール、2はバック
アップロール、3は矯正中の厚鋼板、4はレベラーのハ
ウジング、5は油圧圧下装置、6は圧下力すなわち矯正
反力を検出するロードセル、7はプロセスコンピュータ
ー、8は油圧圧下制御装置で、圧下量を検出するロール
位置検出装置は油圧圧下装置5に内蔵されている。
1 is an example showing the structure of a roller leveler embodying the present invention, 1 is a leveling roll, 2 is a backup roll, 3 is a thick steel plate being straightened, 4 is a leveler housing, and 5 is a hydraulic pressure reduction device. , 6 is a load cell for detecting a pressure reduction force, that is, a correction reaction force, 7 is a process computer, 8 is a hydraulic pressure reduction control device, and a roll position detection device for detecting a reduction amount is built in the hydraulic pressure reduction device 5.

【0017】このレベラーは下5本、上4本計9本のレ
ベラーロールを持つ。すでに説明したとおり圧下量は出
口の最終ロールを0とする傾動圧下で、圧下量では2番
ロールが最大だが、板の反対側に片側しかロールがない
ため板に与える塑性変形としては最大とはならず、この
レベラーでいえば3番目のロールが最大塑性変形を与え
ると考えられる。そこで、3番目のロールで、板厚方向
の80%まで塑性変形を起こさせることを矯正目標とする
と、(2)式においてη3 =0.80 が与えられたからこ
のロールの圧下量δ3 が求められ、ついで(3)式によ
り各ロールの目標圧下量が決定する。
This leveler has a lower 5 rolls and an upper 4 rolls for a total of 9 leveler rolls. As already explained, the rolling amount is under tilting pressure with the final roll at the outlet being 0, and the rolling amount is maximum for the No. 2 roll, but since there is only one roll on the opposite side of the plate, the maximum plastic deformation given to the plate is However, in this leveler, it is considered that the third roll gives the maximum plastic deformation. Therefore, if the correction target is to cause plastic deformation up to 80% in the plate thickness direction with the third roll, η 3 = 0.80 is given in equation (2), so the rolling reduction δ 3 of this roll can be obtained. Then, the target reduction amount of each roll is determined by the equation (3).

【0018】これを(2)式に代入すると各ロールにつ
いて塑性変形の割合ηi (i=1〜9)がすべて求めら
れるので(1)式により目標とする最適矯正反力FS
算出される。しかるのち板を装入して矯正を行い、ロー
ドセル7で矯正反力を検出し、プロセスコンピューター
7で(4)式によりさきに計算した最適矯正反力FS
比較して、不足するレベラーロールの圧下量を算出し、
油圧圧下制御装置8により油圧圧下装置5を駆動してこ
の不足分を補正する。
By substituting this into the equation (2), all the plastic deformation ratios η i (i = 1 to 9) are obtained for each roll, so the target optimum correction reaction force F S is calculated by the equation (1). It After that, the plate is inserted and straightened, the straightening reaction force is detected by the load cell 7, and the lacking leveler roll is compared with the optimum straightening reaction force F S previously calculated by the process computer 7 by the formula (4). Calculate the reduction amount of
The hydraulic pressure reduction device 5 is driven by the hydraulic pressure reduction control device 8 to correct this deficiency.

【0019】同一仕様の板に対しては、この不足分を事
前に補正しておくことにより、板の先端から充分な矯正
を行うことができる。また、前の板材における補正量
と、現在の板材の算出補正量の割合から、次の板材の補
正量を事前に推定して補正することもできる。
For a plate having the same specifications, it is possible to perform sufficient correction from the tip of the plate by correcting this shortage in advance. It is also possible to estimate and correct the correction amount of the next plate material in advance from the ratio of the correction amount of the previous plate material and the calculated correction amount of the current plate material.

【0020】[0020]

【発明の効果】本発明によれば、ロール磨耗による圧下
量の不足が解消され、矯正効果を常にフルに発揮させる
ことが可能となった。また、従来月2回程度の頻度で行
っていた零調整回数が大幅に3ヶ月に1回程度に削減で
き、ライン停止による生産量低下を防止することができ
た。
According to the present invention, the shortage of the reduction amount due to the abrasion of the roll is eliminated, and the correction effect can be always fully exerted. In addition, the number of zero adjustments, which was conventionally performed twice a month, can be greatly reduced to about once every three months, and it is possible to prevent a decrease in production amount due to the line stop.

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

【図1】本発明にかかわるローラーレベラーの構成図で
ある。
FIG. 1 is a configuration diagram of a roller leveler according to the present invention.

【図2】本発明にかかわるローラーレベラーの圧下量を
示す概念図である。
FIG. 2 is a conceptual diagram showing a reduction amount of a roller leveler according to the present invention.

【図3】本発明にかかわるローラーレベラーのロール磨
耗をあらわすグラフである。
FIG. 3 is a graph showing roll wear of a roller leveler according to the present invention.

【符号の説明】[Explanation of symbols]

1 レベラーロール 2 バックアップロール 3 厚鋼板 5 油圧圧下装置 6 ロードセル 7 プロセスコンピューター 8 圧下制御装置 1 Leveler roll 2 Backup roll 3 Heavy steel plate 5 Hydraulic reduction device 6 Load cell 7 Process computer 8 Reduction control device

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 ローラーレベラーによって厚鋼板の歪み
を矯正する矯正処理において、最適な圧下量を設定した
時に生じる矯正反力の計算値と、ロードセルで検出した
矯正反力の実績値との差から不足するレベラーロールの
圧下量を算出し、この不足分を圧下装置により補正して
矯正を行うことを特徴とするローラーレベラーの操業方
法。
1. In a straightening process for straightening a distortion of a thick steel plate by a roller leveler, a difference between a calculated value of a straightening reaction force generated when an optimum reduction amount is set and an actual value of the straightening reaction force detected by a load cell is used. A method for operating a roller leveler, which comprises calculating a reduction amount of a lacking leveler roll and correcting the lacking amount by a reduction device.
JP27236191A 1991-10-21 1991-10-21 Method for operating roller leveler Pending JPH05111716A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27236191A JPH05111716A (en) 1991-10-21 1991-10-21 Method for operating roller leveler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27236191A JPH05111716A (en) 1991-10-21 1991-10-21 Method for operating roller leveler

Publications (1)

Publication Number Publication Date
JPH05111716A true JPH05111716A (en) 1993-05-07

Family

ID=17512813

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27236191A Pending JPH05111716A (en) 1991-10-21 1991-10-21 Method for operating roller leveler

Country Status (1)

Country Link
JP (1) JPH05111716A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011073007A (en) * 2009-09-29 2011-04-14 Nisshin Steel Co Ltd Method of straightening tapered steel plate thickness of which is varied into tapered shape in longitudinal direction
WO2018166929A1 (en) * 2017-03-13 2018-09-20 Sms Group Gmbh Method for operating a roll straightening machine, and roll straightening machine
TWI803342B (en) * 2022-06-08 2023-05-21 國立中山大學 Adjustment assembly for a roller of straightening machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011073007A (en) * 2009-09-29 2011-04-14 Nisshin Steel Co Ltd Method of straightening tapered steel plate thickness of which is varied into tapered shape in longitudinal direction
WO2018166929A1 (en) * 2017-03-13 2018-09-20 Sms Group Gmbh Method for operating a roll straightening machine, and roll straightening machine
CN110418683A (en) * 2017-03-13 2019-11-05 Sms集团有限公司 For running the method and roll leveller of roll leveller
JP2020508880A (en) * 2017-03-13 2020-03-26 エス・エム・エス・グループ・ゲゼルシャフト・ミト・ベシュレンクテル・ハフツング Method for operating a roller straightening machine and roller straightening machine
CN110418683B (en) * 2017-03-13 2021-01-15 Sms集团有限公司 Method for operating a roller straightener and roller straightener
TWI803342B (en) * 2022-06-08 2023-05-21 國立中山大學 Adjustment assembly for a roller of straightening machine

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