JPH09125155A - Method for preventing meandering of passing steel sheet in continuous heat treatment furnace - Google Patents
Method for preventing meandering of passing steel sheet in continuous heat treatment furnaceInfo
- Publication number
- JPH09125155A JPH09125155A JP28520495A JP28520495A JPH09125155A JP H09125155 A JPH09125155 A JP H09125155A JP 28520495 A JP28520495 A JP 28520495A JP 28520495 A JP28520495 A JP 28520495A JP H09125155 A JPH09125155 A JP H09125155A
- Authority
- JP
- Japan
- Prior art keywords
- crown
- heat treatment
- meandering
- steel strip
- continuous heat
- 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明方法は、連続熱処理炉
の通板鋼帯蛇行防止方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing meandering of a steel strip in a continuous heat treatment furnace.
【０００２】[0002]
【従来の技術】連続焼鈍炉等の熱処理炉を通板する鋼帯
の蛇行により、鋼帯幅方向両端部が損傷し歩留り等を低
下させることから、種々の蛇行防止方法が開示されてい
る。例えば、鋼帯の板幅、板厚に基づき、予め設定した
冷却媒体の流量と温度を通板ロールに吹き付けることに
より、通板ロールのクラウンを適正に保持して通板鋼帯
の蛇行を防止することが特公昭５８−４３４５４号公報
に開示されている。2. Description of the Related Art Various meandering prevention methods have been disclosed because the meandering of a steel strip passing through a heat treatment furnace such as a continuous annealing furnace damages both ends of the strip in the width direction of the steel strip and reduces the yield. For example, based on the strip width and strip thickness of the steel strip, by spraying a preset flow rate and temperature of the cooling medium onto the strip strip roll, the crown of the strip strip is held properly and the strip strip is prevented from meandering. This is disclosed in Japanese Patent Publication No. 58-43454.
【０００３】[0003]
【課題を解決するための手段】このような通板ロールの
クラウン制御方法においては、冷却媒体の流量を予め設
定するため、通板ロールのイニシャルクラウン変更時に
設定を見直す必要があり、しかも時々刻々変化する熱処
理条件には対応できない等の課題がある。また、差分収
束計算を利用した通板ロールのクラウン制御による通板
鋼帯の蛇行防止においては、板厚等に基づく冷却媒体流
量、温度の算出に長時間を要する。従って、鋼帯の蛇行
が発生した後に対策がとられることもあり、通板鋼帯を
確実に蛇行を防止することができない等の課題がある。
本発明方法は、このような課題を有利に解決するためな
されたものであり、リアルタイムで通板ロールのクラウ
ン制御を可能とする連続熱処理炉の通板鋼帯蛇行防止方
法を提供することを目的とするものである。In such a method for controlling the crown of the sheet passing roll, since the flow rate of the cooling medium is set in advance, it is necessary to review the setting when the initial crown of the sheet passing roll is changed, and moreover, every moment. There are problems such as not being able to cope with changing heat treatment conditions. Further, in the meandering prevention of the strip running steel strip by the crown control of the strip passing roll using the differential convergence calculation, it takes a long time to calculate the cooling medium flow rate and the temperature based on the strip thickness and the like. Therefore, measures may be taken after the meandering of the steel strip occurs, and there is a problem that it is not possible to reliably prevent the passing steel strip from meandering.
The method of the present invention has been made in order to advantageously solve such a problem, and an object thereof is to provide a method for preventing meandering of a steel strip in a continuous heat treatment furnace that enables real-time crown control of the steel strip. It is what
【０００４】[0004]
【課題を解決するための手段】本発明方法の特徴とする
ところは、連続熱処理の諸元から下記数式に基づき、通
板ロールのクラウンを予測してクラウンを制御すること
を特徴とする連続熱処理炉の通板鋼帯蛇行防止方法であ
る。 ＣTH＝Ｋ・β・Ｒ・（ＴＦ−ＴＳ）／２ 但しＣTH：クラウン、β：通板ロール材料の線膨張定
数、Ｒ：通板ロール径、ＴＦ：炉温、ＴＳ：鋼帯温度、
Ｋ：定数The feature of the method of the present invention is that the continuous heat treatment is characterized in that the crown of the threading roll is predicted and the crown is controlled based on the following mathematical formulas from the specifications of the continuous heat treatment. This is a method for preventing the meandering of the steel strip in the furnace. C TH = K ・ β ・ R ・ (TF-TS) / 2 where C TH : crown, β: linear expansion constant of sheet-rolling roll material, R: sheet-rolling roll diameter, TF: furnace temperature, TS: steel strip temperature ,
K: constant
【０００５】[0005]
【発明の実施の形態】上記のごとく構成することによ
り、一般に用いられている差分収束計算のように長時間
を要することなく、短時間で計算することができるので
時々刻々変化する連続熱処理の諸元（例えば炉温、鋼帯
温度、通板ロール径、通板ロール材料の線膨張定数等）
の変化に応じて、リアルタイムで追従して通板ロールの
クラウンを予測し、この予測に基づきクラウンを制御す
るものである。即ち、本発明方法においては、従来のご
とく、通板ロールを測温することなく鋼帯の蛇行矯正力
を評価するのに必要な通板ロールのクラウンを予測（推
定）するため、上記のごとき連続熱処理の諸元から上記
数式に基づき、通板ロールに形成されるクラウンを予測
し、この予測に基づき、通板鋼帯の蛇行が発生すると判
断した場合は、冷却媒体として例えば、窒素ガスを通板
ロールの幅方向両端部へ吹き付け、通板鋼帯の蛇行が発
生しないクラウンに矯正して鋼帯の蛇行を確実に防止し
つつ、熱処理を施すものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With the above-mentioned configuration, since it is possible to perform a short time calculation without requiring a long time unlike the differential convergence calculation which is generally used, various continuous heat treatments can be performed. Source (for example, furnace temperature, steel strip temperature, strip diameter, strip coefficient)
In accordance with the change of, the crown of the sheet passing roll is predicted in real time and the crown is controlled based on this prediction. That is, in the method of the present invention, as in the prior art, in order to predict (estimate) the crown of the threading roll necessary to evaluate the meandering correction force of the steel strip without measuring the temperature of the threading roll, the above Based on the above formula from the specifications of the continuous heat treatment, predict the crown formed on the threading roll, based on this prediction, when it is determined that the meandering of the threaded steel strip occurs, for example, as a cooling medium, nitrogen gas The heat treatment is performed while spraying to both ends in the width direction of the threading roll and correcting it to a crown in which the meandering of the threaded steel strip does not occur to surely prevent the meandering of the steel strip.
【０００６】このように通板ロールのクラウンを制御し
て、鋼帯の蛇行を防止する熱処理としては、例えば、冷
間圧延後の薄鋼帯を連続的に焼鈍する、連続焼鈍炉の加
熱帯及び均熱帯の通板ロールのクラウンを上記のごとく
予測し、この予測に基づき通板鋼帯が蛇行しないクラウ
ンを形成するように冷却媒体を通板ロール幅方向両端部
に吹き付けるものである。As the heat treatment for controlling the meandering of the steel strip by controlling the crown of the sheet passing roll as described above, for example, the heating zone of the continuous annealing furnace for continuously annealing the thin steel strip after cold rolling. And, the crown of the plate rolling roll in the soaking zone is predicted as described above, and based on this prediction, the cooling medium is sprayed on both ends in the width direction of the plate rolling so that the plate steel strip forms a crown that does not meander.
【０００７】次に、本発明方法の一例を図面により説明
する。図１及び図２において、連続焼鈍炉１の加熱帯２
及び均熱帯３の各炉温、鋼帯温度６、通板ロール４径、
及び通板ロール４の線膨張定数等の連続熱処理諸元を、
予め前記数式を記憶した演算器５へ導入し、通板ロール
４のクラウンを演算して予測し、この予測クラウンから
通板鋼帯６が蛇行するか否かを判断する。蛇行すると判
断したときは、制御器７へ冷却媒体の吹き付けを指示
し、ノズル８から通板ロール４の幅方向両端部へ冷却媒
体９（窒素ガス等）を吹き付け通板ロール４を冷却する
ことによって、クラウン１０を形成し通板鋼帯６の蛇行
を防止する。Next, an example of the method of the present invention will be described with reference to the drawings. 1 and 2, the heating zone 2 of the continuous annealing furnace 1
And soaking temperature 3, each furnace temperature, steel strip temperature 6, threading roll 4 diameter,
And continuous heat treatment specifications such as the linear expansion constant of the threading roll 4,
The mathematical formula is stored in advance in the arithmetic unit 5, the crown of the strip passing roll 4 is calculated and predicted, and it is determined whether the strip steel strip 6 meanders from the predicted crown. When it is determined to meander, the controller 7 is instructed to blow the cooling medium, and the cooling medium 9 (nitrogen gas or the like) is blown from the nozzle 8 to both ends in the width direction of the sheet passing roll 4 to cool the sheet passing roll 4. Thus, the crown 10 is formed to prevent the steel strip 6 from meandering.
【０００８】しかして、熱処理すべき通板鋼帯の鋼種等
の変更により、時々刻々連続焼鈍炉１の熱処理諸元を変
更するとき、その都度上記のごとく演算器５へ変更した
諸元を導入し、通板ロール４のクラウンを予測して通板
鋼帯６が蛇行しない通板ロールのクラウンに制御するも
のである。However, when the heat treatment specifications of the continuous annealing furnace 1 are changed every moment by changing the steel type of the strip steel strip to be heat treated, the changed specifications are introduced into the computing unit 5 as described above. Then, the crown of the threading roll 4 is predicted and the crown of the threading roll is controlled such that the steel strip 6 does not meander.
【０００９】[0009]
【実施例】次に、本発明方法の実施例を挙げる。鋼帯の
連続焼鈍炉において、次記のごとく実施した。 １）加熱帯温度：前段６５０℃、後段８５０℃ ２）均熱帯温度：７５０℃ ３）炉内雰囲気：水素ガス８％、残り窒素ガス ４）通板ロール径：８００ｍｍ ５）鋼帯温度：７５０℃ このような条件において、鋼帯厚１．２ｍｍ、幅９００
ｍｍ、通板速度２５０ｍ／分で、加熱帯及び均熱帯温度
を＋５０℃、鋼帯幅７００〜１３００ｍｍの範囲をそれ
ぞれ時々刻々変更して連続焼鈍を施し、変更した諸元か
ら前記のごとき数式に基づき、通板ロールのクラウンを
予測して、通板ロールが蛇行すると判断したときは、１
００℃の窒素ガスを冷却媒体として２００〜３５０Ｎｍ
3 ／hr通板ロール幅方向両端部へ吹き付け、鋼帯の蛇行
が発生しないクラウン（１ｍｍ以上）に制御しつつ鋼帯
を通板したところ、鋼帯の蛇行量を常時１０ｍｍ以内に
防止して鋼帯の蛇行による歩留り低下、設備の破損等も
なく操業することができた。Next, examples of the method of the present invention will be described. It was carried out in the continuous annealing furnace for steel strips as described below. 1) Heating zone temperature: 650 ° C. in the first stage, 850 ° C. in the second stage 2) Soaking temperature: 750 ° C. 3) Atmosphere in the furnace: Hydrogen gas 8%, remaining nitrogen gas 4) Plate rolling diameter: 800 mm 5) Steel strip temperature: 750 ℃ Under these conditions, steel strip thickness 1.2mm, width 900
mm, strip speed 250 m / min, heating zone and soaking temperature + 50 ° C., steel strip width 700 to 1300 mm range is changed from moment to moment, and continuous annealing is performed. Based on this, if the crown of the threading roll is predicted and it is determined that the threading roll meanders, 1
200-350 Nm using nitrogen gas at 00 ° C as a cooling medium
3 / hr Rolling strip Rolled steel strip was sprayed to both ends in the width direction and passed through the steel strip while controlling the crown (1 mm or more) so that the steel strip does not meander, and the meandering amount of the steel strip was always kept within 10 mm. It was possible to operate without lowering the yield due to the meandering of the steel strip and damaging the equipment.
【００１０】[0010]
【発明の効果】本発明方法によれば、連続熱処理炉の通
板鋼帯の蛇行を確実に防止することができ、蛇行による
鋼帯幅方向両端部の損傷による歩留り低下を防止するこ
とができる。また鋼帯の蛇行による設備の破損を防止す
るとともに、蛇行防止のための通板速度の低下も避けら
れ、生産性の低下も回避することができる等の優れた効
果が得られる。According to the method of the present invention, it is possible to reliably prevent the meandering of the strip steel strip of the continuous heat treatment furnace, and to prevent the yield reduction due to the damage of both ends in the width direction of the strip due to the meandering. . Further, it is possible to prevent damage to the equipment due to the meandering of the steel strip, avoid a decrease in the strip running speed for the purpose of preventing meandering, and avoid a decrease in productivity.
【図１】本発明方法の一例を示す要部の側面図である。FIG. 1 is a side view of essential parts showing an example of a method of the present invention.
【図２】通板ロールの冷却状況を示す正面図である。FIG. 2 is a front view showing a cooling state of a sheet passing roll.
Claims (1)
き、通板ロールのクラウンを予測してクラウンを制御す
ることを特徴とする連続熱処理炉の通板鋼帯蛇行防止方
法。 ＣTH＝Ｋ・β・Ｒ・（ＴＦ−ＴＳ）／２ 但しＣTH：クラウン、β：通板ロール材料の線膨張定
数、Ｒ：通板ロール径、ＴＦ：炉温、ＴＳ：鋼帯温度、
Ｋ：定数1. A method for preventing the meandering of a steel strip in a continuous heat treatment furnace, which comprises predicting the crown of a threading roll from the specifications of the continuous heat treatment based on the following formula and controlling the crown. C TH = K ・ β ・ R ・ (TF-TS) / 2 where C TH : crown, β: linear expansion constant of sheet-rolling roll material, R: sheet-rolling roll diameter, TF: furnace temperature, TS: steel strip temperature ,
K: constant
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28520495A JPH09125155A (en) | 1995-11-01 | 1995-11-01 | Method for preventing meandering of passing steel sheet in continuous heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28520495A JPH09125155A (en) | 1995-11-01 | 1995-11-01 | Method for preventing meandering of passing steel sheet in continuous heat treatment furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09125155A true JPH09125155A (en) | 1997-05-13 |
Family
ID=17688455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28520495A Withdrawn JPH09125155A (en) | 1995-11-01 | 1995-11-01 | Method for preventing meandering of passing steel sheet in continuous heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09125155A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999050464A1 (en) * | 1998-03-26 | 1999-10-07 | Kawasaki Steel Corporation | Continuous heat treating furnace and atmosphere control method and cooling method in continuous heat treating furnace |
| JP2008280586A (en) * | 2007-05-11 | 2008-11-20 | Mitsubishi-Hitachi Metals Machinery Inc | Steel strip conveying roll for heat treating furnaces, and heat treating furnace |
| KR20210059059A (en) | 2019-11-13 | 2021-05-25 | 주식회사 포스코 | Steel plate transfer device |
-
1995
- 1995-11-01 JP JP28520495A patent/JPH09125155A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999050464A1 (en) * | 1998-03-26 | 1999-10-07 | Kawasaki Steel Corporation | Continuous heat treating furnace and atmosphere control method and cooling method in continuous heat treating furnace |
| US6190164B1 (en) | 1998-03-26 | 2001-02-20 | Kawasaki Steel Corporation | Continuous heat treating furnace and atmosphere control method and cooling method in continuous heat treating furnace |
| JP2008280586A (en) * | 2007-05-11 | 2008-11-20 | Mitsubishi-Hitachi Metals Machinery Inc | Steel strip conveying roll for heat treating furnaces, and heat treating furnace |
| KR20210059059A (en) | 2019-11-13 | 2021-05-25 | 주식회사 포스코 | Steel plate transfer device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030107 |