JPH0557413A - Method for predicting breakout in continuous casting - Google Patents
Method for predicting breakout in continuous castingInfo
- Publication number
- JPH0557413A JPH0557413A JP24641291A JP24641291A JPH0557413A JP H0557413 A JPH0557413 A JP H0557413A JP 24641291 A JP24641291 A JP 24641291A JP 24641291 A JP24641291 A JP 24641291A JP H0557413 A JPH0557413 A JP H0557413A
- Authority
- JP
- Japan
- Prior art keywords
- breakout
- casting
- continuous casting
- temperature
- predicting
- 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
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、連続鋳造におけるブ
レークアウト、特に鋳片が鋳型に何らかの原因で拘束さ
れて生じる，いわゆる拘束性のブレークアウトを予知す
る方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breakout in continuous casting, and more particularly to a method for predicting a so-called restraint breakout which occurs when a slab is restrained by a mold for some reason.
【０００２】[0002]
【従来の技術】連続鋳造における生産性や安全性等を阻
害する鋳片のブレークアウトの発生を防止するには、ブ
レークアウトの発生を予知して、これに対処することが
肝要である。このブレークアウトの予知は、連続鋳造用
鋳型の温度挙動を指標とするのが、通例である。具体的
には、検出温度が平均温度より上昇してから下降したと
き（特開昭57−152356号公報参照）、検出温度が参照値
より高いとき（特開昭57−115959号公報参照）、検出温
度の変化率が所定範囲をこえたとき（特開昭57−115962
号公報参照）及び検出温度が定常水準より高温側に偏倚
したとき（特開昭56−95461 号及び同60−44163 号各公
報参照）を、それぞれブレークアウトの発生と判断して
いる。2. Description of the Related Art In order to prevent the occurrence of breakout of a slab that impairs productivity and safety in continuous casting, it is important to predict the occurrence of breakout and deal with it. The prediction of this breakout is usually based on the temperature behavior of the continuous casting mold as an index. Specifically, when the detected temperature rises above the average temperature and then falls (see JP-A-57-152356), when the detected temperature is higher than the reference value (see JP-A-57-115959), When the rate of change of the detected temperature exceeds a predetermined range (Japanese Patent Laid-Open No. 57-115962).
When the detected temperature deviates to a temperature higher than the steady level (see Japanese Patent Laid-Open Nos. 56-95461 and 60-44163), it is determined that a breakout has occurred.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら鋳型の温
度は鋳造条件によって異なるため、上記した方法ではブ
レークアウトの発生を正確に予知することが難しい。そ
こでこの発明は、拘束性ブレークアウトの発生を、鋳造
条件の変化に拘わらず正確に予知する方法について提案
することを目的とする。However, since the temperature of the mold differs depending on the casting conditions, it is difficult to accurately predict the occurrence of breakout by the above method. Therefore, an object of the present invention is to propose a method for accurately predicting the occurrence of restraint breakout regardless of changes in casting conditions.
【０００４】[0004]
【課題を解決するための手段】発明者らが鋳型温度と鋳
造条件、つまりモールドフラックス、鋳型振動条件及び
鋳造速度等との関係を調べたところ、鋳型温度は鋳造条
件の中でも特に鋳造速度によって変化することを知見
し、この発明を完成するに到った。The inventors investigated the relationship between the mold temperature and the casting conditions, that is, the mold flux, the mold vibration condition, the casting speed, etc., and found that the mold temperature changed depending on the casting speed among the casting conditions. Therefore, the present invention has been completed.
【０００５】すなわちこの発明は、連続鋳造用鋳型の温
度を測定し、この測定温度に基いた単位時間当たり温度
上昇変化率から拘束性ブレークアウトの発生を予知する
方法において、拘束性ブレークアウト発生の判定基準と
なる温度上昇変化率を、鋳造速度の関数とすることを特
徴とする連続鋳造におけるブレークアウト予知方法であ
る。That is, the present invention is a method for predicting the occurrence of restraint breakout from the temperature of a continuous casting mold and predicting the occurrence of restraint breakout from the rate of change in temperature rise per unit time based on the measured temperature. It is a breakout prediction method in continuous casting, characterized in that the rate of change in temperature rise, which is a criterion, is used as a function of casting speed.
【０００６】[0006]
【作用】さて鋳型の検出温度の温度上昇変化率（以下Δ
Ｔ／Δｔと示す）と鋳造速度との関係を、ブレークアウ
トの発生に到った鋳造について図１に、またブレークア
ウトのない健全な鋳造について図２に、それぞれ示す。
図１及び２に示すように、ΔＴ／Δｔは低速鋳造域で小
さく高速鋳造域で大きいことがわかり、特にブレークア
ウトの発生した鋳造で、この傾向は強いことが判明し
た。従って、例えばブレークアウト発生の判定基準とな
るΔＴ／Δｔ（以下判定しきい値と示す）を0.5 ℃/sと
した場合、図１に示した鋳造において鋳造速度が1.0m/m
in以下ではブレークアウトの発生を見逃す場合が生じ、
一方図２に示した鋳造において鋳造速度が1.4m/min以上
では健全な鋳造をブレークアウトの発生と誤って検知す
る場合が生じる。[Function] Now, the rate of change in temperature of the detected temperature of the template (hereinafter Δ
The relationship between (T / Δt) and the casting speed is shown in FIG. 1 for the casting in which the breakout occurred and in FIG. 2 for the sound casting without the breakout.
As shown in FIGS. 1 and 2, it was found that ΔT / Δt was small in the low-speed casting region and large in the high-speed casting region, and this tendency was found to be strong particularly in the casting in which breakout occurred. Therefore, for example, when ΔT / Δt (hereinafter referred to as a determination threshold value), which is a criterion for determining the occurrence of breakout, is 0.5 ° C./s, the casting speed in the casting shown in FIG.
If it is less than or equal to in, you may miss the occurrence of breakout,
On the other hand, in the casting shown in FIG. 2, when the casting speed is 1.4 m / min or more, sound casting may be erroneously detected as breakout occurrence.
【０００７】そこで判定しきい値を鋳造速度の関数とす
ることによって、鋳造速度が低速から高速までの幅広い
領域の鋳造において、ブレークアウトの発生を見逃し又
は誤検知することなく、ブレークアウトの正確な判定が
可能になる。Therefore, by using the judgment threshold value as a function of the casting speed, in the casting in a wide range of casting speed from low speed to high speed, the occurrence of breakout can be accurately detected without overlooking or erroneously detecting the occurrence of breakout. Judgment becomes possible.
【０００８】なお判定しきい値を鋳造速度の関数とする
には、鋼種や連続鋳造機等によって異なるため、予め実
験などで関数化をはかって実際の鋳造に適用するとよ
い。In order to make the judgment threshold value a function of the casting speed, it depends on the type of steel, the continuous casting machine, etc., so it is advisable to apply it to actual casting after making it into a function in advance by experiments.
【０００９】[0009]
【実施例】低炭素鋼を用い、厚さ:260mm及び幅:800〜19
00mmの鋳型にて鋳造速度を0.5 〜1.7m/minの範囲で種々
に変化する連続鋳造を行った。そして実施した鋳造速度
毎に図３に示す判定しきい値を設定し、まず鋳型温度を
図４に示すところに従って測定し、これらの測定温度と
判定しきい値とを図５に示す演算器で比較し、測定温度
のうち隣接する３測温点が判定しきい値をこえたときに
警報を発するとともに、自動又は手動で鋳造速度を低下
しブレークアウトの発生を防止した。[Example] Using low carbon steel, thickness: 260 mm and width: 800-19
Continuous casting was performed in a 00 mm mold with various casting speeds in the range of 0.5 to 1.7 m / min. Then, the judgment threshold value shown in FIG. 3 is set for each casting speed, and the mold temperature is first measured according to the place shown in FIG. 4, and the measured temperature and the judgment threshold value are calculated by the calculator shown in FIG. In comparison, an alarm was issued when three adjacent temperature measuring points out of the measured temperatures exceeded the judgment threshold value, and the casting speed was automatically or manually lowered to prevent breakout.
【００１０】上記の各連続鋳造中のブレークアウト予知
における誤検知率及び見逃し率を、図６及び７に示すよ
うに、この発明に従う方法はブレークアウトの発生を正
確に予知できた。さらに中及び高炭素鋼についても同様
の鋳造を、それぞれ実験によって求めた判定しきい値に
基くブレークアウトの予知の下に、行ったところ、ブレ
ークアウトの発生は皆無であった。As shown in FIGS. 6 and 7, the false detection rate and the miss rate in the breakout prediction during the continuous casting described above, the method according to the present invention could accurately predict the occurrence of breakout. Further, the same casting was performed on the medium and high carbon steels under the prediction of the breakout based on the judgment threshold value obtained by the experiment, respectively, and no breakout occurred.
【００１１】なお判定しきい値は鋳造速度毎に段階的に
変化させたが、鋳造速度に対応して直線的に変化させて
もよい。例えば先に図１及び２に示した鋳造において
は、図１の下限値と図２の上限値との間を通る直線式と
すればよい。一例を図３中の１点鎖線で示す。この場合
の直線は、 ΔＴ／Δｔ＝ａ＋ｂ×Ｖc （ａ＝0.2, ｂ＝0.3,
Ｖc ：鋳造速度（m/分) ）で表される。この式中のａお
よびｂは、鋼種などによって変化するのは、既に述べた
とおりである。Although the judgment threshold value is changed stepwise for each casting speed, it may be changed linearly according to the casting speed. For example, in the casting shown in FIGS. 1 and 2 above, a linear formula passing between the lower limit value of FIG. 1 and the upper limit value of FIG. 2 may be used. An example is shown by the one-dot chain line in FIG. The straight line in this case is ΔT / Δt = a + b × V c (a = 0.2, b = 0.3,
V c : It is represented by the casting speed (m / min). As described above, a and b in this formula change depending on the steel type and the like.
【００１２】[0012]
【発明の効果】この発明によれば、誤検知や見逃しの極
めて少ないブレークアウトの予知を行うことができ、従
って正確な予知に基づくブレークアウトの防止をはか
れ、安定した連続鋳造を実現し得る。According to the present invention, it is possible to predict breakouts with extremely few false detections and misses. Therefore, it is possible to prevent breakouts based on accurate predictions and realize stable continuous casting. ..
【図１】鋳造速度と温度上昇変化率との関係を示すグラ
フである。FIG. 1 is a graph showing a relationship between a casting speed and a temperature rise change rate.
【図２】鋳造速度と温度上昇変化率との関係を示すグラ
フである。FIG. 2 is a graph showing a relationship between a casting speed and a temperature rise change rate.
【図３】鋳造速度と温度上昇変化率との関係を示すグラ
フである。FIG. 3 is a graph showing a relationship between a casting speed and a temperature rise change rate.
【図４】鋳型の測温位置を示す摸式図である。FIG. 4 is a schematic diagram showing a temperature measurement position of a mold.
【図５】ブレークアウトの防止要領を示す摸式図であ
る。FIG. 5 is a schematic diagram showing a procedure for preventing breakout.
【図６】誤検知率を示すグラフである。FIG. 6 is a graph showing a false detection rate.
【図７】見逃し率を示すグラフである。FIG. 7 is a graph showing a miss rate.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 糸山 誓司 千葉県千葉市川崎町１番地 川崎製鉄株式 会社技術研究本部内 (72)発明者 田中 修二 千葉県千葉市川崎町１番地 川崎製鉄株式 会社千葉製鉄所内 (72)発明者 渡利 三夫 千葉県千葉市川崎町１番地 川崎製鉄株式 会社千葉製鉄所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Itoyama 1 Kawasaki-cho, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Technical Research Headquarters (72) Inventor Shuji Tanaka 1 Kawasaki-cho, Chiba-shi Kawasaki Steel Co., Ltd. Chiba Steel Works (72) Inventor Mitsuo Watari 1 Kawasaki-cho, Chiba City, Chiba Prefecture Kawasaki Steel Co., Ltd. Chiba Steel Works
Claims (1)
定温度に基いた単位時間当たり温度上昇変化率から拘束
性ブレークアウトの発生を予知する方法において、拘束
性ブレークアウト発生の判定基準となる温度上昇変化率
を、鋳造速度の関数とすることを特徴とする連続鋳造に
おけるブレークアウト予知方法。1. A method for measuring the temperature of a casting mold for continuous casting and predicting the occurrence of a restrictive breakout from the rate of change in temperature rise per unit time based on the measured temperature, which is a criterion for determining the restrictive breakout occurrence. A method of predicting breakout in continuous casting, characterized in that the rate of change in temperature rise is a function of casting speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24641291A JPH0557413A (en) | 1991-09-02 | 1991-09-02 | Method for predicting breakout in continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24641291A JPH0557413A (en) | 1991-09-02 | 1991-09-02 | Method for predicting breakout in continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0557413A true JPH0557413A (en) | 1993-03-09 |
Family
ID=17148106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24641291A Pending JPH0557413A (en) | 1991-09-02 | 1991-09-02 | Method for predicting breakout in continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0557413A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013052431A (en) * | 2011-09-06 | 2013-03-21 | Jfe Steel Corp | Method for measuring temperature in mold for continuous casting |
| JP2013128946A (en) * | 2011-12-21 | 2013-07-04 | Jfe Steel Corp | Method of predicting constrained breakout of cast slab in continuous casting |
-
1991
- 1991-09-02 JP JP24641291A patent/JPH0557413A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013052431A (en) * | 2011-09-06 | 2013-03-21 | Jfe Steel Corp | Method for measuring temperature in mold for continuous casting |
| JP2013128946A (en) * | 2011-12-21 | 2013-07-04 | Jfe Steel Corp | Method of predicting constrained breakout of cast slab in continuous casting |
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