KR20130088298A - Device for forecasting number of continuous-continuous casting on continuous casting process and method therefor - Google Patents

Abstract

PURPOSE: An apparatus and a method for predicting a number of continuous castings are provided to prevent the factors of decreased productivity like decreased casting speed or stopped continuous castings by predicting the clogging of a submerged nozzle. CONSTITUTION: An apparatus for predicting a number of continuous castings comprises a pressure detecting unit and a central processing part. The pressure detecting unit is installed in an inert gas supply pipe to measure the internal pressure of the inert gas supply pipe. The central processing part periodically collects the pressure measured by the pressure detecting unit. The central processing part calculates a current pressure variation rate using a pressure gradient calculated by a linear regression equation based on the collected pressure, and predicts the number of continuous castings using the current pressure variation rate and a previous pressure variation rate. [Reference numerals] (AA) Start; (BB,DD) No; (CC,EE) Yes; (FF) Finish; (S10) Inject inactive case via a stopper in a casting process; (S11) Determine whether the speed becomes an aimed speed or not; (S12) Aimed speed?; (S13) Periodically measure pressure when injecting the inactive gas; (S14) Collect pressure during a unit period; (S15) The unit period is over?; (S16) Calculate a pressure change rate of the current period by using linear regression; (S17) Calculate the pressure change rate of the current period by using pressure inclination; (S18) Calculate pressure accumulated change rate by multiplying the pressure change rate of the current period and a pressure change rate of the whole period; (S19) Predict continuous casting possible number based on the pressure change rate

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for predicting an open performance of continuous casting,

More particularly, the present invention relates to an apparatus and method for predicting an open-casting number during continuous casting in which the degree of clogging of an immersion nozzle is predicted to predict an openable number.

The continuous casting machine is a machine that is produced in the steel making furnace, receives the molten steel transferred to the ladle by the tundish, and supplies it to the mold for the continuous casting machine to produce the cast steel of a certain size.

The continuous casting machine includes a ladle for storing molten steel, a playing mold for cooling the tundish and the molten steel discharged from the tundish for the first time to form a casting cast having a predetermined shape, and the casting cast formed in the mold connected to the mold. It includes a plurality of pinch rolls.

In other words, the molten steel tapping out of the ladle and tundish is formed as a cast piece having a predetermined width, thickness and shape in a mold and is transferred through a pinch roll, and the cast piece transferred through the pinch roll is cut by a cutter. It is made of slabs (Slab), Bloom (Bloom), Billet (Billet) and the like having a predetermined shape.

Related Prior Art Korean Patent Laid-Open Publication No. 2004-50195 (published on June 16, 2004, entitled " Immersion nozzle clogging detection and prevention device ") is available.

The present invention is an apparatus for estimating the number of soft drinks during continuous casting, which can predict the number of soft drinks by predicting the degree of blockage of the immersion nozzle using the pressure change rate and the cumulative pressure change rate applied to the pipe to which the inert gas of the stopper is supplied. To provide.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above.

The soft-fuel prediction device of the present invention for realizing the above problem is provided on a pipe to which an inert gas is supplied, and a pressure detection to measure a back pressure in the pipe by a gas supplied to the immersion nozzle side through a stopper. Way; And periodically collecting the pressure measured by the pressure detecting means for a predetermined unit period, calculating a pressure gradient by linear regression equations for the collected pressure measured values, and calculating a current cycle pressure change rate using the calculated pressure slope. And, the central processing unit for predicting the number of possible performances using the current cycle pressure change rate and the stored full cycle pressure change rate; may include.

The central processing unit may calculate the cumulative pressure change rate by multiplying the current cycle pressure change rate by the total cycle pressure change rate cumulatively, and predict the number of consecutive performances using the calculated pressure cumulative change rate.

In order to achieve the above object, the soft-fuel prediction method of the present invention includes: periodically collecting a back pressure in a pipe by a gas supplied to an immersion nozzle through a stopper for a predetermined unit period; Calculating a pressure gradient by linear regression of the pressure actual values collected during the unit cycle; Calculating a current cycle pressure change rate using the pressure gradient calculated above; And calculating the cumulative pressure change rate using the calculated current cycle pressure change rate and the stored total cycle pressure change rate, and predicting the number of consecutive performances based on the calculated pressure change rate.

The unit cycle may be one of a molten steel discharge amount, a casting time, and a length of a casting casting.

The cumulative pressure change rate may be calculated by accumulating the current cycle pressure change rate and the total cycle pressure change rate cumulatively.

As described above, according to the present invention, by predicting the degree of clogging of the immersion nozzle by using the pressure change rate and the pressure cumulative change rate applied to the pipe to which the inert gas of the stopper is supplied, productivity decrease factors such as decrease in casting speed or stop casting of cast lead. There is an advantage that can be prevented by predicting in advance.

1 is a conceptual diagram showing a continuous casting machine according to an embodiment of the present invention mainly on the flow of molten steel.
FIG. 2 is a view showing an apparatus for predicting a running performance according to an embodiment of the present invention.
3 is a view for explaining the clogging state of the immersion nozzle.
FIG. 4 is a flowchart illustrating a process of predicting an annual performance number according to an embodiment of the present invention.
5 and 6 are diagrams for explaining the pressure cumulative change rate and the number of consecutive years according to the pressure.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like elements in the figures are denoted by the same reference numerals wherever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

1 is a conceptual diagram showing a continuous casting machine according to an embodiment of the present invention mainly on the flow of molten steel.

Continuous casting is a casting process in which a molten metal is continuously cast into a bottomless mold while continuously drawing a steel ingot or steel ingot. Continuous casting is used to manufacture slabs, blooms and billets, which are mainly rolled materials, and long products of simple cross-section such as square, rectangle, and circle.

The shape of a continuous casting machine is classified into a vertical type and a vertical bending type. In Fig. 1, a vertical bending type is illustrated.

Referring to FIG. 1, the continuous casting machine may include a ladle 10, a tundish 20, a mold 30, secondary cooling tables 60 and 65, and a pinch roll 70.

The tundish 20 is a container that receives the molten metal from the ladle 10 and supplies the molten metal to the mold 30. In the tundish 20, the supply rate of the molten metal flowing into the mold 30 is controlled, the molten metal is distributed to each mold 30, the molten metal is stored, and the slag and the nonmetallic inclusions are separated.

The mold 30 is typically made of water-cooled copper and allows the molten steel to be primary cooled. The mold 30 has a pair of structurally opposed faces open to form a hollow portion for receiving molten steel. In the case of manufacturing the slab, the mold 30 includes a pair of barriers and a pair of end walls connecting the barriers. Here, the end wall has a smaller area than the barrier. The walls of the mold 30, mainly short walls, may be rotated away from or close to each other to have a certain level of taper. This taper is set to compensate for the shrinkage due to the solidification of the molten steel M in the mold 30. The degree of solidification of the molten steel (M) will vary depending on the carbon content, the type of powder (steel cold Vs slow cooling), casting speed and the like depending on the steel type.

The mold 30 is formed such that a solidified shell or a solidified shell 81 is formed so as to maintain the shape of the casting pluck pulled out from the mold 30 and to prevent the molten metal from being hardly outflowed from flowing out. . The water-cooling structure includes a method using a copper tube, a method of water-cooling the copper block, and a method of assembling a copper tube having a water-cooling groove.

The mold 30 is oscillated by the oscillator 40 to prevent the molten steel from sticking to the wall of the mold. Lubricant is used to reduce friction between the mold 30 and the solidification shell 81 and prevent burning during oscillation. As the lubricant, there is oil to be sprayed and powder added to the molten metal surface in the mold 30. The powder is added to the molten metal in the mold 30 to become slag, as well as lubrication of the mold 30 and the solidification shell 81, as well as to prevent oxidation and nitriding of the molten metal in the mold 30, to keep warm, and to the surface of the molten metal. It also performs the function of absorption of emerging nonmetallic inclusions. A powder feeder 50 is installed to feed the powder into the mold 30. The portion of the powder feeder 50 for discharging the powder is directed to the inlet of the mold 30.

The secondary cooling zones 60 and 65 further cool the molten steel primarily cooled in the mold 30. The primary cooled molten steel is directly cooled by the spraying means 65 for spraying water while being maintained by the support roll 60 so that the coagulation angle is not deformed. The solidification of the cast steel is mostly made by the secondary cooling.

The drawing device adopts a multidrive method using a pair of pinch rolls 70 and the like so as to pull out the cast pieces without slipping. The pinch roll 70 pulls the solidified tip of the molten steel in the casting direction, thereby allowing the molten steel passing through the mold 30 to continuously move in the casting direction.

The continuous casting machine configured as described above allows the molten steel M accommodated in the ladle 10 to flow into the tundish 20. For this flow, the ladle 10 is provided with a shroud nozzle 15 extending toward the tundish 20. The shroud nozzles 15 extend into the molten steel in the tundish 20 so that the molten steel M is not exposed to the air and oxidized and nitrided.

The molten steel M in the tundish 20 is caused to flow into the mold 30 by the submerged entry nozzle 25 extending into the mold 30. The immersion nozzle 25 is disposed at the center of the mold 30 so that the flow of the molten steel M discharged from both the discharge ports of the immersion nozzle 25 can be made symmetrical. The start, discharge speed, and stop of the discharge of the molten steel M through the immersion nozzle 25 are determined by a stopper 21 installed in the tundish 20 in response to the immersion nozzle 25. Specifically, the stopper 21 can be vertically moved along the same pipe as the immersion nozzle 25 so as to open and close the inlet of the immersion nozzle 25. [ The control of the flow of the molten steel M through the immersion nozzle 25 may be performed by a slide gate method different from the stopper method. The slide gate controls the discharge flow rate of the molten steel (M) through the immersion nozzle (25) while the plate material slides horizontally in the tundish (20).

Molten steel (M) in the mold (30) starts to solidify from a portion in contact with the wall surface of the mold (30). This is because the periphery of the molten steel M is liable to lose heat by the water-cooled mold 30. The rear portion along the casting direction of the cast slab 80 is formed into a shape in which the non-solidified molten steel 82 is wrapped in the solidifying shell 81 by the method in which the peripheral portion first coagulates.

As the pinch roll 70 (FIG. 1) pulls the tip portion 83 of the completely cast solid cast piece 80, the unsolidified molten steel 82 moves together with the solidified shell 81 in the casting direction. The non-solidified molten steel (82) is cooled by the spraying means (65) for spraying the cooling water in the up-shifting process. This causes the thickness of the non-solidified molten steel (82) to gradually decrease in the cast steel (80). When the cast steel 80 reaches one point 85, the cast steel 80 is filled with the solidification shell 81 of the entire thickness. The solidification casting 80 having been solidified is cut to a predetermined size at the cutting point 91 and is divided into a slab P such as a slab or the like.

FIG. 2 is a diagram illustrating an apparatus for estimating a number of years in accordance with an embodiment of the present invention, wherein the prediction apparatus 100 includes a pressure detecting unit 110, an input unit 120, a storage unit 130, a display unit 140, and a center. It comprises a processing unit 150.

The pressure detecting means 110 is installed on the piping 105 to which the inert gas is supplied and measures the back pressure of the piping due to the gas supplied to the immersion nozzle 25 through the stopper 21. A hollow is provided at the center of the stopper 21 to supply the inert gas in the longitudinal direction. An inert gas is supplied to the immersion nozzle 25 through the hollow. The pressure detecting means 110 is installed on the piping through which the inert gas between the stopper 21 and the external flow controller 101 is supplied and measures the pressure applied to the piping 105 by the supply of the gas.

The input unit 120 is configured to receive various operation parameters and setting reference values from the outside. Here, the input unit 120 may be an input means such as a keyboard or an input means connected to an external PLC (Programmable Logic Controller) to receive predetermined operation information. The operating information may be a casting parameter such as casting width, casting thickness, density, casting speed, etc., or a set value such as a measuring cycle and a unit cycle for predicting the number of annual performances.

The storage unit 130 stores measured actual pressure information, a pressure gradient, a pressure change rate, and a pressure accumulation change rate calculated using the pressure information, measurement cycles and unit cycles for predicting the number of years of performance, Information on the casting width, casting thickness, casting speed and the like are stored.

The display unit 140 may selectively display a pressure, a pressure change rate, and a pressure cumulative change rate in the pipe due to the measured or calculated gas.

The central processing unit 150 stores various data input through the input unit 120 in the storage unit 130, and periodically collects the pressure measured by the pressure detecting unit 110 for a predetermined unit period and stores the storage unit 130. ), Calculate the pressure gradient using the linear regression model of the stored pressure measurement, calculate the current cycle pressure change rate using the calculated pressure slope, and calculate the current cycle pressure change rate and the stored total cycle pressure. The rate of change is used to predict the number of performers. Here, the central processing unit 150 may calculate the cumulative pressure change rate by multiplying the current cycle pressure change rate and the total cycle pressure change rate cumulatively, and predict the number of consecutive performances using the calculated pressure accumulation change rate.

The unit cycle can be set based on the molten steel discharge amount, the casting time, or the length of the cast slab 80. When the unit cycle is a molten steel discharge amount, the central processing unit 150 can calculate the molten steel discharge amount using the width, thickness, density, and peripheral speed of the preformed cast steel. If the unit cycle is time, When the period is the length of the casting slab 80, the casting length of the cast slab 80 can be obtained using the peripheral speed. The circumferential speed is calculated using the rotational speed of the pinch roll 70, which is a known matter, and thus a detailed description thereof will be omitted.

The tundish 20 installed in the continuous casting machine is used to continuously receive molten steel from the ladle 10 and inject molten steel into the mold 30. The tundish 20 is provided between the mold 30 and the bottom of the tundish 20 The immersion nozzle 25 is installed from the bottom of the tundish 20 toward the mold 30 so that the molten steel is supplied to the mold 30 without being in contact with the air and molten steel stored in the tundish 20 is supplied to the mold 30 .

The molten steel supplied to the immersion nozzle 25 at the beginning of the casting is in contact with the inner wall of the immersion nozzle 25 and the molten steel is lowered in temperature and the molten steel is solidified on the inner wall of the immersion nozzle 25, Thereby making the flow of the molten steel uneven and blocking the immersion nozzle 25. As shown in Fig. 3, the adhesion layer 29 grown on the inner wall of the immersion nozzle 25 is detached by the molten steel flow or makes the molten steel flow in the immersion nozzle 25 non-uniform. In addition, the molten steel flow discharged to the discharge hole of the immersion nozzle 25 is shifted to one side, which causes the flow of the molten steel flow to interfere with the molten steel bath surface of the mold 30. As described above, when a wave is generated on the molten steel bath surface, a cast slab failure occurs in which the mold powder on the upper surface of the molten metal is collected in the solidification layer in the mold 30.

If an adhesion layer is formed inside the immersion nozzle 25 and clogging of the immersion nozzle occurs, the casting is stopped and the casting water drop rate is lowered. That is, the number of ladles continuously cast in one tundish 20 (ladle bottom tundish) is reduced, which causes the cost of the refractory of the tundish 20 to rise, so that clogging of the immersion nozzle 25 should be minimized .

Since non-metallic inclusion exists in the molten steel temporarily stored in the tundish 20, when non-metallic inclusions are fixed to the inner wall of the refractory on the side of the immersion nozzle 25 when molten steel is transferred to the mold 30, ).

In order to prevent such clogging, argon gas (Ar gas), which is an inert gas, is continuously blown. The blown inert gas forms a bubble or a bubble film to flow along the inner wall of the immersion nozzle (25), or bubbles collect and move non-metallic inclusions, thereby reducing clogging.

If the immersion nozzle 25 is blocked, ferrostatic pressure is increased at the lower end of the stopper 21, which is the upper part of the immersion nozzle 25, and if the iron static pressure is increased, the pressure in the pipe to which the inert gas is supplied is increased. Is increased. It can be seen that the clogged state of the immersion nozzle 25 is increased when the pressure is increased. That is, when the measured pressure is larger than the set reference pressure (theoretical pressure), the clogging of the immersion nozzle 25 can be regarded as occurring, and the degree of clogging of the immersion nozzle 25 can be predicted have.

The pressure detecting means 110 measures the pressure in the pipe through which the inert gas is supplied, and predicts the number of possible performances by using the measured pressure. To this end, the present invention calculates the current cycle pressure change rate by periodically measuring the pressure applied to the pipe to which the inert gas is supplied during the set unit cycle, and then accumulates the pressure change rate using the current cycle pressure change rate and the preset total cycle pressure change rate. By calculating the cumulative change rate of the immersion nozzle 25 indirectly using the calculated pressure change rate, it is possible to predict the number of possible performances.

For example, when the molten steel cleanliness is lowered, molten steel is reoxidized and the immersion nozzle 25 is clogged. If the immersion nozzle 25 becomes clogged, the normal casting operation becomes difficult to reduce the casting speed or stop the casting of the continuous casting.

Therefore, in order to prevent the productivity from deteriorating, it is necessary to predict the open playability due to clogging of the immersion nozzle 25.

FIG. 4 is a flowchart illustrating a process of predicting an annual performance number according to an embodiment of the present invention, and will be described with reference to the accompanying drawings.

The flow controller 101 controls the inert gas to be injected into the immersion nozzle 25 through the hollow of the stopper 21 along the pipe 105 at step S10.

In this state, the central processing unit 150 calculates the peripheral speed during continuous casting through the number of rotations of the pinch roll 70, and determines whether the calculated main speed is the target peripheral speed (S11). When the casting speed reaches the target pitch, the process of predicting the number of concertos starts. The target state rate can be set in advance.

When the casting speed reaches the target circumferential speed (S12), the central processing unit 150 periodically collects the pressure applied to the pipe 105 by the supply of the inert gas from the pressure detecting means 110. Here, the pressure detecting unit 110 continuously measures the pressure applied to the pipe, and transmits the measured pressure measured at the corresponding time point to the central processing unit 150 according to the collection cycle of the central processing unit 150 ( S13).

At this time, the central processing unit 150 collects on the basis of a set unit cycle when collecting the measured pressure. Here, the unit cycle is determined based on the molten steel discharge amount (for example, 1 to 10 tons) or the casting time (for example, 1 to 10 minutes) or the length of the casting 80 (for example, 1 to 20 m) Can be set. When the unit cycle is a molten steel discharge amount, the central processing unit 150 can calculate the molten steel discharge amount using the width, thickness, density, and peripheral speed of the preformed cast steel. If the unit cycle is time, When the period is the length of the casting slab 80, the casting length of the cast slab 80 can be obtained using the peripheral speed. However, since the clogging of the immersion nozzle 25 is related to the non-metallic inclusion contained in the molten steel, the unit cycle can be the most accurate prediction based on the molten steel discharge amount (S14).

"과 같은 선형회귀식을 구할 수 있고, 여기서 압력기울기는 a값인 것이다.As such, the central processing unit 150 periodically collects the actual pressure during the set unit cycle, and calculates the pressure gradient of the current cycle by linear regression on the collected pressure measured value after the unit cycle passes (S15, S16). . That is, if the linearly regression of the pressure measured value measured in the molten steel discharge amount, which is a unit cycle,

We can get a linear regression equation such as ", where the pressure gradient is a value.

The current period pressure change rate is calculated by substituting the slope of the current period pressure obtained as described in Equation 1 below (S17).

Relationship 1

The central processing unit 150 stores the calculated current cycle pressure change rate together with the time information in the storage unit 130.

The central processing unit 150 obtains a current period pressure change rate and then checks whether there is a pre-period pressure change rate stored in the storage unit 130. If there is a full cycle pressure change rate stored in the storage unit 130, the central processing unit 150 calculates the cumulative pressure change rate by multiplying the calculated current cycle pressure change rate by the cumulative total cycle pressure change rate (S18). Here, the method for calculating the pressure cumulative change rate is as in the following Equation 2.

Relation 2

0.98

0.99)가 될 것이다. 본 발명에서는 압력변화율을 이용하여 연연주 가능수를 예측하게 되는 데, 이는 압력의 경우 설비나 설치 상태에 따라 다소의 차이가 있기 때문에 그 변화율을 사용하는 것이다.For example, if the current cycle pressure change rate is '0.95', the total cycle pressure change rate is '0.98', and the previous cycle pressure change rate is '0.99', the cumulative pressure change rate is '0.92' (0.95).

0.98

0.99). In the present invention, it is possible to predict the number of possible performances by using the rate of change of pressure, which is to use the rate of change because the pressure is somewhat different depending on the installation or installation conditions.

Subsequently, when the pressure change rate is calculated, the central processing unit 150 predicts the number of consecutive performances through the pressure change rate (S19). The number of possible performances according to the pressure change rate is shown in Table 1 below.

Cumulative pressure change rate Can be played annually Explanation 1.0 to 0.9 + 1Heat Available for 1Heat Less than 0.9 0Heat (casting stopped) The next lecture stopped.

As shown in Table 1, if the cumulative pressure change rate is 0.9 or more, the number of consecutive casts is at least + 1Heat. If the cumulative pressure change rate is less than 0.90, only the current casting is performed and the smoker stops. Here, 1eat means casting of molten steel contained in one ladle 10.

If the cumulative pressure change rate is 0.9 or more, the number of possible performances is + 1Heat, where the number of performances is not a cumulative value but means the number of performances available in the current casting.

; 0.9) 이상이 되는 것으로 나타났다. 압력 누적변화율이 연연주 기준치인 0.9 이상일 경우에는 추가적인 연연주(6연연주)가 가능하다.5 shows the cumulative change rate of the pressure during the five-thousand performance, when the stopper pos' of the stopper 21 is gradually changed (the opening amount gradually increases without a large change), the pressure in the pipe due to the gas ( Ar Pressure) was also gradually increased without a sudden change. Although the cumulative pressure change rate gradually decreases when the pressure in the pipe is constant without a sudden change in gas, within the five-period,

; 0.9) or more. If the pressure cumulative change rate is higher than the standard performance level of 0.9, additional performances (6 performances) are possible.

)인 0.9 미만으로 감소되는 것으로 나타났다. 이 경우에는 다음 연연주(6연연주)가 불가능한 것으로 예측하고, 다음 주조를 중단하게 된다. However, in the case of FIG. 6, the pressure due to the gas supply is maintained without significant change in the three-ply cast. From approximately four-ply, the pressure applied to the pipe 105 starts to increase while being somewhat unstable. The cumulative rate of change begins to change somewhat. Of course, it can be seen that the position of the stopper 21 also changes abruptly. The cumulative rate of change of pressure in the five performances is based on the

), Which is less than 0.9. In this case, it is predicted that the next annual performance (six-year performance) is impossible, and the next casting is stopped.

Therefore, in the present invention, by predicting the degree of clogging of the immersion nozzle 25 using the pressure change rate and the pressure cumulative change rate applied to the pipe to which the inert gas of the stopper 21 is supplied, it is possible to reduce the casting speed or stop casting the cast. The factor of lowering productivity can be predicted and prevented in advance.

The above-described soft playability prediction method is not limited to the configuration and operation of the embodiments described above. The above embodiments may be configured such that various modifications may be made by selectively combining all or part of the embodiments.

10: ladle 15: shroud nozzle
20: Tundish 20a:
21: stopper 25: immersion nozzle
30: Mold 40: Mold oscillator
50: Powder feeder 60: Support roll
65: spray 70: pinch roll
80: Play piece 91: Cutting point
100: prediction device 101: flow controller
105: gas piping 110: pressure detecting means
120: input unit 130: storage unit
140: display unit 150: central processing unit

Claims (8)

Pressure detecting means installed on a pipe to which inert gas is supplied and measuring a back pressure in the pipe by the gas supplied to the stopper; And
The pressure measured by the pressure detecting means is periodically collected for a set unit cycle, the pressure slope is calculated by linear regression equation on the collected pressure measured value, and then the current cycle pressure change rate is calculated using the calculated pressure slope. And a central processor for predicting the number of consecutive performances using the current cycle pressure change rate and the stored total cycle pressure change rate.
The method according to claim 1,
The central processing unit calculates the cumulative pressure change rate by multiplying the current cycle pressure change rate and the total cycle pressure change rate by a cumulative rate, and using the calculated pressure cumulative change rate to predict the number of consecutive performance of continuous casting time continuous casting apparatus.
The method according to claim 1,
The present cycle pressure change rate is a continuous number prediction device during continuous casting calculated by the following relation.
Relation

Periodically collecting back pressure in the pipe by the gas supplied to the stopper for a predetermined unit period;
Calculating a pressure gradient by linear regression of the pressure actual values collected during the unit cycle;
Calculating a current cycle pressure change rate using the pressure gradient calculated above; And
Calculating the cumulative pressure change rate using the calculated current cycle pressure change rate and the stored total cycle pressure change rate, and predicting the number of consecutive performance possible through the calculated pressure cumulative change rate; Way.
The method of claim 4,
Wherein the unit cycle is one of a molten steel discharge amount, a casting time, and a length of a casting casting.
The method of claim 4,
The cumulative pressure change rate is a method for predicting the annual number of consecutive weeks when continuous casting is calculated by multiplying the current cycle pressure change rate and the total cycle pressure change rate cumulatively.
The method of claim 4,
The pressure change rate is a continuous number prediction method during continuous casting is calculated by the following relationship.
Relation

The method of claim 4,
If the cumulative pressure change rate is less than 0.9 in the continuous casting to stop the continuous casting method.

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