JPH021590B2 - - Google Patents
Info
- Publication number
- JPH021590B2 JPH021590B2 JP3138983A JP3138983A JPH021590B2 JP H021590 B2 JPH021590 B2 JP H021590B2 JP 3138983 A JP3138983 A JP 3138983A JP 3138983 A JP3138983 A JP 3138983A JP H021590 B2 JPH021590 B2 JP H021590B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- molten steel
- ladle
- pouring
- master
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 56
- 239000010959 steel Substances 0.000 claims description 56
- 238000000034 method Methods 0.000 claims description 24
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 238000009749 continuous casting Methods 0.000 claims description 7
- 230000005499 meniscus Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 238000005266 casting Methods 0.000 description 14
- 238000001816 cooling Methods 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 7
- 238000012937 correction Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009848 ladle injection Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
【発明の詳細な説明】
本発明は連続鋳造に係り、特に、プロセスコン
ピユータを用いた２次冷却制御の基礎となる鋳込
温度の設定方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to continuous casting, and particularly to a method for setting a casting temperature, which is the basis of secondary cooling control using a process computer.
連続鋳造２時冷却におけるダイナミツク制御
は、鋳片品質の高位安定化を目的とするもので、
所定のソフトウエアを内蔵したプロセスコンピユ
ータのオンライン制御により鋳片温度の凝固過程
を考慮した冷却を進めてゆくものである。このオ
ンライン冷却制御における初期温度は、鋳込温度
としてプロセスコンピユータに入力される。 The purpose of dynamic control during continuous casting 2-hour cooling is to stabilize slab quality at a high level.
Cooling is carried out by taking into consideration the solidification process of the slab temperature through online control of a process computer equipped with predetermined software. The initial temperature in this online cooling control is input into the process computer as the casting temperature.
ところで、鋳込温度は、本来的にはモールド内
メニスカス部の溶鋼温度であるべきところ、この
部分の温度計測は不可能であるので、従来ではタ
ンデイツシユ内の溶鋼温度の計測値を初期データ
としていた。しかも、溶鋼温度は鋳造中に温度低
下をおこすため１チヤージで複数回、逐時的に計
測するのが通常であり、煩雑であるとともに経済
コストの点で問題があつた。 By the way, the pouring temperature should originally be the temperature of the molten steel at the meniscus in the mold, but since it is impossible to measure the temperature in this area, conventionally the measured value of the molten steel temperature in the tundish was used as initial data. . In addition, the temperature of molten steel is normally measured multiple times during one charge because the temperature decreases during casting, which is complicated and causes problems in terms of economic cost.
そこで本発明は、プロセスコンピユータに設定
する鋳込温度をより正確に与えることができると
ともに、簡単かつ経済的に設稚できる、連続鋳造
における鋳込温度の設定方法を提供することを目
的とする。 SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for setting a casting temperature in continuous casting, which allows a process computer to be set at a casting temperature more accurately, and which can be easily and economically set up.
本発明は第１図に説明的に示す５つの工程、
、、、、からなる。すなわち、第の
工程は、連続鋳造工程の前工程である溶鋼処理工
程搬出時に親鍋内の溶鋼温度を実測し、その実測
温度と注入開始までの経過時間より、親鍋注入開
始時の親鍋内溶鋼温度を求める。次の第工程
は、注入開始からの経過時間と第工程で求めた
注入開始時の親鍋内溶鋼温度の値より、親鍋注入
中の親鍋内溶鋼温度を逐次的に求める。第工程
は、タンデイツシユ（以下、「TD」と略記する）
への鋳込開始からの経過時間と、TDの種類と、
前記第工程で求めた注入中の親鍋内溶鋼温度よ
り、TD内の溶鋼温度を逐次的に求める。次の第
工程は修正工程で、１チヤージに１回だけTD
内の溶鋼温度を実測し、その実測値に基づいて第
工程で求めた注入中の新鍋内溶鋼温度と、第
工程で求めたTD内の溶鋼温度の値を修正する。
最終工程の第工程では、第工程で修正された
溶鋼温度値を含む第工程のTD内溶鋼温度の値
と、TDの使用開始時からの経過時間とからモー
ルド内メニスカス部の溶鋼温度（鋳込温度）を逐
次的に求める。こうして求めた鋳込温度データを
鋳片温度の初期値としてコンピユータに設定す
る。以降は、この初期値が２次冷却制御たとえば
スプレー冷却水制御ないしピンチロール表面温度
制御等の基礎となる。 The present invention consists of five steps illustrated in FIG.
It consists of ,,,. In other words, in the second step, the temperature of the molten steel in the parent ladle is actually measured at the time of carrying out the molten steel processing process, which is a pre-process of the continuous casting process, and based on the measured temperature and the elapsed time until the start of injection, the temperature of the molten steel at the time of starting the injection of the parent ladle is determined. Find the internal molten steel temperature. In the next step, the temperature of the molten steel in the master ladle during pouring into the master ladle is sequentially determined from the elapsed time from the start of injection and the value of the molten steel temperature in the master ladle at the time of the start of injection determined in the first step. The second step is tandate (hereinafter abbreviated as "TD")
The elapsed time from the start of casting, the type of TD,
The temperature of the molten steel in the TD is determined sequentially from the temperature of the molten steel in the parent pot during pouring determined in the first step. The next process is a correction process, which only takes one TD per charge.
The temperature of the molten steel in the TD is actually measured, and based on the measured value, the temperature of the molten steel in the new ladle during pouring determined in the first step and the temperature of the molten steel in the TD determined in the first step are corrected.
In the final process, the molten steel temperature in the meniscus part of the mold (casting temperature) is determined sequentially. The casting temperature data obtained in this way is set in the computer as the initial value of the slab temperature. Thereafter, this initial value becomes the basis for secondary cooling control, such as spray cooling water control or pinch roll surface temperature control.
実測以外の温度を求める手段は、好ましくは、
予め規定されプログラムの形式で記述される数式
に基づいて、内蔵する計時手段の時間経過に従い
各動作の検出手段に接続されたオンラインのコン
ピユータが演算して求める。このコンピユータは
２次冷却制御を実行するプロセスコンピユータと
することができる。したがつて、２次冷却制御以
前も自動化が可能となる。 Preferably, the means for determining the temperature other than actual measurement is
The on-line computer connected to the detection means for each operation performs calculations based on a predetermined mathematical formula written in the form of a program, according to the elapsed time of the built-in timer. This computer can be a process computer that performs secondary cooling control. Therefore, automation is possible even before secondary cooling control.
以下、本発明を、添付図面を参照しながら述べ
る実施例に基づきより具体的に説明する。 Hereinafter, the present invention will be described in more detail based on embodiments described with reference to the accompanying drawings.
第工程：
溶鋼処理工程搬出時における親鍋内溶鋼温度の
実測値をT1 *とし、このT1 *実測時から親鍋注入
開始までの経過時間をt1とすると、親鍋注入開始
時における親鍋内溶鋼温度の算出値T2は次式の
ように表わされる。1st process: Molten steel processing process Let T 1 * be the actual measured value of the molten steel temperature in the master ladle at the time of transport, and let t 1 be the elapsed time from the actual measurement of T 1 * to the start of the master ladle injection, then the temperature at the time of starting the master ladle injection is The calculated value T 2 of the molten steel temperature in the master ladle is expressed as follows.
T2＝f1（T1 *、t1） ……(1)
そしてT2は、第２図のように変化するので、f1
はT1 *、t1についての多項式で表わすことができ
る。そこで、一例として次式のごとく規定する。 T 2 = f 1 (T 1 * , t 1 ) ...(1) And since T 2 changes as shown in Figure 2, f 1
can be expressed as a polynomial in T 1 * , t 1 . Therefore, as an example, the following equation is defined.
f1（T1 *、t1）＝T1 *＋at1 ……（１−１）
ここで、ａは単位時間（sec）あたりの親鍋内
溶鋼温度（℃）の温度変化量である。なお、以降
で定義される温度、時間はすべて℃およびsec
（秒）である。 f 1 (T 1 * , t 1 )=T 1 * +at 1 (1-1) Here, a is the amount of temperature change in the molten steel temperature (° C.) in the parent pot per unit time (sec). All temperatures and times defined below are in °C and sec.
(seconds).
第工程：
親鍋注入開始時からの経過時間t2とすると、親
鍋注入中の親鍋内溶鋼温度の算出器T3は、次式
のように表わされる。なお、T2は先の第工程
で算出される値である。Step 1: Assuming that the elapsed time from the start of pouring into the master ladle is t2 , the calculator T3 of the temperature of molten steel in the master ladle during pouring into the master ladle is expressed as follows. Note that T 2 is the value calculated in the previous step.
T3＝f2（T1、t2） ……(2)
そして、T3は第３図に示すように変化するの
で、f2はT2、t2についての多項式で表わすことが
できる。 T 3 =f 2 (T 1 , t 2 ) (2) Since T 3 changes as shown in FIG. 3, f 2 can be expressed as a polynomial with respect to T 2 and t 2 .
そこで、一例として次式のごとく規定する。 Therefore, as an example, the following equation is defined.
f2（T2、t2）＝T2＋bt2 ……（２−１）
ここで、ｂは単位時間あたりの親鍋内溶鋼温度
の温度変化量である。親鍋内の溶鋼量は減少して
ゆくことから、この係数ｂは前記係数ａよりも絶
対値としては大きく選ばれる。 f 2 (T 2 , t 2 )=T 2 +bt 2 (2-1) Here, b is the amount of temperature change in the molten steel temperature in the master ladle per unit time. Since the amount of molten steel in the parent pot decreases, the coefficient b is selected to be larger in absolute value than the coefficient a.
第工程：
タンデイツシユTDの使用開始時からの経過時
間をt3とすると、TD内溶鋼温度の算出値T4は第
４図の下のグラフのように表わされ、次の微分方
程式で近似できる。Step 1: If the elapsed time from the start of use of the tundish TD is t3 , the calculated value of the molten steel temperature in the TD, T4 , is expressed as shown in the lower graph of Figure 4, and can be approximated by the following differential equation. .
TcdT4／dt3＋T4＝KT3 ……(3)
ここで、T3は先の第工程で算出される値で、
係数Tc、ＫはタンデイツシユTDの種類によつて
変わる値である。すなわち、TcはTD内のレンガ
に熱が蓄積するまでの時定数であり、一方Ｋは時
間t3が十分大きくなつて定常状態となつたときの
鍋内溶鋼温度k3とTD内溶鋼温度k4との比率k4／
k3である。 TcdT 4 /dt 3 +T 4 =KT 3 ...(3) Here, T 3 is the value calculated in the previous step,
The coefficients Tc and K are values that change depending on the type of tundish TD. That is, Tc is the time constant until heat accumulates in the bricks in the TD, while K is the molten steel temperature in the ladle k3 and the molten steel temperature in the TD when time t3 becomes sufficiently large and a steady state is reached. Ratio with 4 k 4 /
k3 .
TD内溶鋼温度T4の時間変化とパラメータの関
係を第５図に示す。係数Tcは、TDの使用開始時
すなわちt3＝０における曲線T4の接続と親鍋内溶
鋼温度変化の直線T3との交差点までの時間であ
る。k3、k4はt3→∞とする外挿演算で簡単に算出
できる。 Figure 5 shows the relationship between the time change of the molten steel temperature T4 in the TD and the parameters. The coefficient Tc is the time between the connection of the curve T 4 at the start of use of the TD, that is, t 3 =0, and the intersection with the straight line T 3 of the temperature change of the molten steel in the master ladle. k 3 and k 4 can be easily calculated by extrapolating t 3 →∞.
第工程：
この工程はTD内の溶鋼温度を温度センサで直
接計測しその実測値を得て、前記工程で算出した
親鍋注入中の親鍋内溶鋼温度T3およびTD内溶鋼
温度T4を修正する工程である。これら算出値T3、
T4の修正値をそれぞれT′3、T′4とあらわし、TD
内溶鋼温度の実測値をT4 *とすると、
T′3＝f3（T3、T4、T4 *）
T′4＝T4 * ……(4)
のように表わされる。ここで、第６図に示すよう
に、時間経過のある時点t0の温度偏差のみを問題
とするから、上記関数f3は先と同様にT3、T4、
T4 *についての多項式で表現することができる。
そこで、一例として次式のごとく規定する。1st step: In this step, the temperature of molten steel in the TD is directly measured with a temperature sensor to obtain the actual value, and the molten steel temperature T 3 in the parent pot during injection into the parent pot and the molten steel temperature T 4 in the TD calculated in the previous step are calculated. This is a correction process. These calculated values T 3 ,
The modified values of T 4 are expressed as T′ 3 and T′ 4 , respectively, and TD
When the actual value of the internal molten steel temperature is T 4 * , it is expressed as T' 3 = f 3 (T 3 , T 4 , T 4 * ) T' 4 = T 4 * (4). Here, as shown in FIG. 6, since we are concerned only with the temperature deviation at a certain point t 0 over time, the above function f 3 is calculated as T 3 , T 4 ,
It can be expressed as a polynomial about T 4 * .
Therefore, as an example, the following equation is defined.
f3（T3、T4、T4 *）＝cT3＋dT4＋eT4 *
……（４−１）
ここで、この第（４−１）式を変形し、係数を
適当に選んで次式を得る。f 3 (T 3 , T 4 , T 4 * ) = cT 3 + dT 4 + eT 4 *
(4-1) Here, this equation (4-1) is transformed and the coefficients are appropriately selected to obtain the following equation.
f3（T3、T4、T4 *）＝T3−c′（T4 *−T4）
……（４−２）
こうすると、係数c′は意味をもち、TD内の溶
鋼温度偏差（T4 *−T4）を親鍋内の溶鍋温度算出
値にフイードバツクするための定数となる。この
係数c′の値は、前記工程で求めた係数Ｋ（＝
k4／k3）の逆数を用いる。f 3 (T 3 , T 4 , T 4 * ) = T 3 −c′ (T 4 * − T 4 )
...(4-2) In this way, the coefficient c' has meaning and becomes a constant for feeding back the molten steel temperature deviation (T 4 * − T 4 ) in the TD to the calculated value of the molten ladle temperature in the parent ladle. . The value of this coefficient c' is the coefficient K (=
k 4 /k 3 ) is used.
第工程：
TD内の溶鋼温度算出値T4（なお、修正値T′4も
含めて代表させる）と、TD使用開始時からの経
過時間t3とにより、鋳込温度の算出値T5が次式の
とおり求められる。1st step: The calculated value T 5 of the pouring temperature is calculated from the calculated value T 4 of the molten steel temperature in the TD (the corrected value T′ 4 is also included) and the elapsed time t 3 from the start of TD use . It is calculated as follows.
T5＝f4（T4、t3） ……(5)
ここで、第７図に示すごとく、T5はT4の変化
に追随するのと考えられるから、多項式で表現し
たT4と同様、f4も多項式で表わすことができる。
一例として次式のごとく規定する。 T 5 = f 4 (T 4 , t 3 ) ...(5) Here, as shown in Figure 7, T 5 is considered to follow the change in T 4 , so T 4 expressed as a polynomial and Similarly, f 4 can also be expressed as a polynomial.
As an example, the following formula is defined.
f4（T4、t3）＝gT4＋ht3 ……（５−１）
第（５−１）式に関し、先にも述べたとおり、
本来的に鋳込温度を実測することができないこと
から係数ｇとｈの値を決めることができない。し
かし一般論として、TDとモールド内メメニスカ
ス部間の熱流出は極めて少ないものと考えられる
ので、ｇを１に近い値、ｈを０に近い値に選ぶこ
とができる。 f 4 (T 4 , t 3 )=gT 4 +ht 3 ...(5-1) Regarding equation (5-1), as mentioned earlier,
Since it is essentially impossible to actually measure the casting temperature, the values of the coefficients g and h cannot be determined. However, in general terms, it is considered that the heat flow between the TD and the meniscus in the mold is extremely small, so g can be chosen to have a value close to 1, and h can be chosen to be a value close to 0.
次に、先に掲げた演算式中の係数を、現実に稼
働している連続鋳造設備における実測データを基
礎とし、算出値の具体例を示す。 Next, specific examples of calculated values will be shown based on the coefficients in the above-mentioned calculation formula based on actual measurement data in continuous casting equipment that is actually in operation.
第（１−１）式のａ；ａ＝−0.005（℃／sec） 第（２−１）式ｂ；ｂ＝−0.08（℃／sec） 第(3)式のTc、Ｋ；Tc＝300（sec） Ｋ＝0.99 第（４−１）式のｃ、ｄ、ｅ；ｃ＝1.00 ｄ＝−1.01 ｅ＝1.00 すなわち第（４−２）式のc′；c′＝1.01 第（５−１）式のｇ、ｈ；ｇ＝1.0 ｈ＝0.00（℃／sec） これは理想的な状態とした。a in equation (1-1); a=-0.005 (℃/sec) Equation (2-1) b; b=-0.08 (℃/sec) Tc, K in equation (3); Tc = 300 (sec) K=0.99 c, d, e in equation (4-1); c=1.00 d=-1.01 e=1.00 In other words, c′ in equation (4-2); c′=1.01 g, h in equation (5-1); g=1.0 h=0.00 (℃/sec) This was an ideal situation.
第８図のグラフに示すように、溶鋼処理工程搬
出時の親鍋内溶鋼温度の実測値T1 *が1600℃であ
り、T1 *実測時から親鍋注入開始までの経過時間
t1が1530secであつたので、親鍋注入開始時の親
鍋内溶鋼温度の算出値T2は、
T2＝1600−0.005×1530＝1592.3（℃）
……（１−２）
と算出される。 As shown in the graph of Figure 8, the actual value T 1 * of the temperature of the molten steel in the master ladle at the time of carrying out the molten steel treatment process is 1600°C, and the elapsed time from the time of T 1 * actual measurement to the start of pouring into the master ladle.
Since t 1 was 1530 sec, the calculated value T 2 of the molten steel temperature in the master ladle at the start of pouring into the master ladle is T 2 = 1600 − 0.005 × 1530 = 1592.3 (℃)
...(1-2) It is calculated as follows.
注入開始時よりの経過時間t2をパラメータとす
る注入中溶鋼温度算出値T3は次の（２−２）式
のとおりであるから、
T3＝1592.3−0.008t2 ……（２−２）
例えばt2＝500、1000、1500、2000、2500、
3000で、T3は夫々、1588.3、1584.3、1580.3、
1576.3、1572.3、1568.3（℃）と算出される。 The calculated value T 3 of the temperature of molten steel during injection using the elapsed time t 2 from the start of injection as a parameter is as shown in the following equation (2-2), so T 3 = 1592.3 − 0.008t 2 ... (2-2 ) For example, t 2 = 500, 1000, 1500, 2000, 2500,
3000, T 3 are respectively 1588.3, 1584.3, 1580.3,
Calculated as 1576.3, 1572.3, 1568.3 (℃).
TD使用開始時からの経過時間t3を変数とする
微分方程式は、次式（３−１）のとおりで、
300dT4／dt3＋T4＝0.99（1592.3−0.008t2）
……（３−１）
t3＝t2とし、dT4／dt3は各時点ｔ＝t3における曲線
の傾きを求めることによつて、T4は次のごとく
算出できる。 The differential equation with the elapsed time t 3 from the start of TD use as a variable is as shown in the following equation (3-1): 300dT 4 /dt 3 +T 4 = 0.99 (1592.3−0.008t 2 ) ……(3− 1) By setting t 3 = t 2 and calculating dT 4 /dt 3 by finding the slope of the curve at each time point t = t 3 , T 4 can be calculated as follows.
t3＝０（sec）において、 T4＝1498.0（℃）
t3＝100 ＝1520.8
t3＝200 ＝1535.6
t3＝300 ＝1546.6
t3＝500 ＝1559.4
t3＝1000 ＝1567.9
t3＝1500 ＝1566.2
t3＝2000 ＝1562.2
t3＝2500 ＝1558.8
t3＝3000 ＝1554.9
t3＝3500 ＝1550.9
なお、上記微分方程式の初期値（t3＝０）は、
当該鋼種における液相温度としている。At t 3 = 0 (sec), T 4 = 1498.0 (℃) t 3 = 100 = 1520.8 t 3 = 200 = 1535.6 t 3 = 300 = 1546.6 t 3 = 500 = 1559.4 t 3 = 1000 = 1567.9 t 3 = 1500 = 1566.2 t 3 = 2000 = 1562.2 t 3 = 2500 = 1558.8 t 3 = 3000 = 1554.9 t 3 = 3500 = 1550.9 The initial value (t 3 = 0) of the above differential equation is:
This is the liquidus temperature of the relevant steel type.
TD内溶鋼温度実測値の修正演算は、修正前の
親鍋内溶鋼温度算出値T3が1581.0（℃）で、同じ
く修正前のTD内溶鋼温度算出値T4が1566.5（℃）
であり、一方実測によりT4 *＝1570（℃）が得ら
れたので、修正後のT3すなわちT3′は
T3′＝1581.0−1.01（1566.5−1570）
＝1584.5（℃） ……（４−３）
となる。そして、T′4＝T4 *＝1570（℃）となる。
以降は、第８図に示すように、このT′3、T′4を基
礎として以前の算出方法に沿つて各時点で鋳込温
度の初期値が与えられてゆく。 In the correction calculation of the actual measured value of the molten steel temperature in the TD, the calculated value T 3 of the molten steel temperature in the parent pot before correction is 1581.0 (℃), and the calculated value T 4 of the molten steel temperature in the TD before correction is 1566.5 (℃).
On the other hand, since T 4 * = 1570 (℃) was obtained by actual measurement, T 3 after correction, that is, T 3 ′, is T 3 ′ = 1581.0 − 1.01 (1566.5 − 1570) = 1584.5 (℃) ... ( 4-3) becomes. Then, T′ 4 =T 4 * =1570 (°C).
Thereafter, as shown in FIG. 8, the initial value of the casting temperature is given at each point in time based on T' 3 and T' 4 according to the previous calculation method.
ちなみに、第９図に本実施例を用いて行つた４
回のチヤージの実際のデータを示す。グラフ中、
△印は各チヤージにおける鍋内溶鋼温度の算出
値、・印はTD内溶鋼温度の算出値、○印は１チ
ヤージで１回だけ行つたTD内溶鋼温度の実測値
である。 By the way, Figure 9 shows 4
Shows actual data on charges. In the graph,
The △ mark is the calculated value of the molten steel temperature in the ladle for each charge, the * mark is the calculated value of the TD inner molten steel temperature, and the ○ mark is the actual value of the TD inner molten steel temperature measured only once in one charge.
グラフから明らかなように、第１チヤージでは
＋５℃、第２チヤージでは０、第３チヤージでは
−２℃、第４チヤージでは−１℃の誤差しか生じ
ていない。したがつて５℃以内の誤差範囲で鋳込
温度の設定が可能となつた。５℃以内であると、
以降の２次冷却制御において鋳片品質は充分高品
位に維持できるものである。 As is clear from the graph, the error was only +5°C in the first charge, 0 in the second charge, -2°C in the third charge, and -1°C in the fourth charge. Therefore, it became possible to set the casting temperature within an error range of 5°C. If it is within 5℃,
In the subsequent secondary cooling control, the slab quality can be maintained at a sufficiently high level.
以上の説明から明らかなように、本発明によれ
ば、鋳込温度そのものを演算によつて求めるよう
にしたので従来のようにタンイツシユ内溶鋼温度
で近似するよりも正確な初期値が設定できるよう
になつた。しかも、従来のごとく１チヤージで複
数回実測して鋳込温度の初期値を与えるのに比
べ、本発明では、修正のために１回だけ測温すれ
ばよいからその工程自体簡単であるとともに、コ
スト低減に貢献する。ちなみに、１回の測温では
約400円かかるが、測温コストに限つてみれば少
なくとも１チヤージで２〜3000円の削減となる。 As is clear from the above explanation, according to the present invention, since the casting temperature itself is determined by calculation, a more accurate initial value can be set than the conventional method of approximating the temperature of molten steel in the tank. It became. Moreover, compared to the conventional method where the initial value of the casting temperature is obtained by actually measuring the temperature multiple times in one charge, in the present invention, the temperature only needs to be measured once for correction, which simplifies the process itself. Contribute to cost reduction. By the way, it costs about 400 yen to measure the temperature once, but if you look only at the cost of temperature measurement, you can save at least 2 to 3,000 yen per charge.
また、鋳込温度の算出結果を操業運転室の
CRTに時々刻々と表示できるので、操業のガイ
ダンスとすることができるといつた利点もある。 In addition, the calculation results of the casting temperature are stored in the operating room.
It also has the advantage of being able to be displayed on the CRT from time to time, so it can be used as guidance for operations.
第１図は本発明の実施例の概念フロー図、第２
図、第３図、第４図、第５図、第６図および第７
図は夫々本発明の実施例の各工程を説明するため
のグラフ、第８図は具体例の算出結果等を示すグ
ラフ、第９図は実際に４回のチヤージを行つたと
きの結果を時間順に示したグラフである。
Figure 1 is a conceptual flow diagram of an embodiment of the present invention;
Figures 3, 4, 5, 6 and 7
The figures are graphs for explaining each step of the embodiment of the present invention, Figure 8 is a graph showing the calculation results of a specific example, and Figure 9 is a graph showing the results of actually performing four charges over time. It is a graph shown in order.
Claims (1)
出時に親鍋内の溶鋼温度を実測し、その実測温度
と注入開始までの経過時間より、親鍋注入開始時
の親鍋内溶鋼温度を求める第１工程と、 親鍋注入開始からの経過時間と前記第１工程で
求めた親鍋注入開始時の親鍋内溶鋼温度より、親
鍋注入中の親鍋内溶鋼温度を求める第２工程と、 タンデイツシユへの鋳込開始からの経過時間と
このタンデイツシユの種類に基づく定数と前記第
２工程で求めた注入中の親鍋内溶鋼温度より、タ
ンデイツシユ内の溶融温度を求める第３工程と、 １チヤージに少なくとも１回、タンデイツシユ
内の溶鋼温度を実測しその実測値に基づいて前記
第２工程及び第３工程で求めた溶鋼温度を修正す
る第４工程と、 前記第３工程で求めた溶鋼温度又は前記第４工
程で修正された溶鋼温度の値とタンデイツシユの
使用開始時からの経過時間とからモールド内メニ
スカス部の溶鋼温度を求める第５工程とからな
り、前記第５工程で得られる鋳込温度データを鋳
片温度の初期値としてプロセスコンピユータに設
定するようにしたことを特徴とする連続鋳造にお
ける鋳込温度の設定方法。[Scope of Claims] 1. The temperature of the molten steel in the parent ladle is actually measured at the time of carrying out the molten steel treatment process, which is a pre-process of the continuous casting process, and based on the measured temperature and the elapsed time until the start of injection, the temperature of the molten steel at the time of the start of pouring into the parent ladle is The first step is to calculate the temperature of the molten steel in the master ladle, and the temperature of the molten steel in the master ladle during pouring is calculated from the elapsed time from the start of pouring into the master ladle and the temperature of the molten steel in the master ladle at the start of pouring into the master ladle, which was determined in the first step. A second step of determining the melting temperature in the tundish from the elapsed time from the start of pouring into the tundish, a constant based on the type of the tundish, and the molten steel temperature in the parent ladle during pouring determined in the second step. a fourth step of actually measuring the molten steel temperature in the tundish at least once per charge and correcting the molten steel temperature determined in the second and third steps based on the measured value; and the third step. and a fifth step of determining the molten steel temperature at the meniscus portion in the mold from the molten steel temperature determined in or the value of the molten steel temperature corrected in the fourth step and the elapsed time from the start of use of the tundish. 1. A method for setting a pouring temperature in continuous casting, characterized in that the pouring temperature data obtained in the above step is set in a process computer as an initial value of the slab temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3138983A JPS59156559A (en) | 1983-02-25 | 1983-02-25 | Method for setting casting temperature in continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3138983A JPS59156559A (en) | 1983-02-25 | 1983-02-25 | Method for setting casting temperature in continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59156559A JPS59156559A (en) | 1984-09-05 |
| JPH021590B2 true JPH021590B2 (en) | 1990-01-12 |
Family
ID=12329903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3138983A Granted JPS59156559A (en) | 1983-02-25 | 1983-02-25 | Method for setting casting temperature in continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59156559A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61249655A (en) * | 1985-04-26 | 1986-11-06 | Kawasaki Steel Corp | Method and apparatus for controlling temperature of molten steel in tundish |
| JPH0673733B2 (en) * | 1988-11-17 | 1994-09-21 | 住友金属工業株式会社 | Method of controlling molten steel temperature in tundish at the beginning of casting |
| JP5262980B2 (en) * | 2009-05-18 | 2013-08-14 | 新日鐵住金株式会社 | Tundish delivery side molten steel temperature change prediction system and tundish delivery side molten steel temperature change prediction method |
-
1983
- 1983-02-25 JP JP3138983A patent/JPS59156559A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59156559A (en) | 1984-09-05 |
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