WO2013048083A2 - 연속주조시 연연주수 예측 방법 - Google Patents
연속주조시 연연주수 예측 방법 Download PDFInfo
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- WO2013048083A2 WO2013048083A2 PCT/KR2012/007701 KR2012007701W WO2013048083A2 WO 2013048083 A2 WO2013048083 A2 WO 2013048083A2 KR 2012007701 W KR2012007701 W KR 2012007701W WO 2013048083 A2 WO2013048083 A2 WO 2013048083A2
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
Definitions
- the present invention relates to the prediction of the number of years, and more particularly to a method of predicting the number of years of continuous casting to predict the number of possible performance by predicting the degree of blockage of the immersion nozzle.
- Continuous casting machine is a facility that produces cast steel of constant size by receiving molten steel produced in steel making furnace and transferred to ladle in tundish and supplying it to mold for continuous casting machine.
- 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.
- 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.
- the present invention is to provide a method for predicting the number of consecutive weeks during continuous casting that can predict the number of possible performance by predicting the blockage of the immersion nozzle through the amount of fluctuation of the level of the surface of the mold.
- the present invention provides a method for predicting the number of consecutive rings during continuous casting, which can predict the number of consecutive casting possible by predicting the degree of blockage of the immersion nozzle using the position change of the stopper.
- the soft-drain prediction method of the present invention comprises the steps of: periodically measuring the surface level of the molten steel in accordance with the flow of molten steel in the mold; Counting the total number of times of measurement measured during the unit period and the number of abnormalities in which each level is out of the set reference range when the set unit period elapses; Calculating a hit ratio based on the total number of measurements and the number of abnormalities counted above; And calculating the cumulative hit ratio by accumulating the calculated hit surface hit ratio on the previous hit surface hit ratio, and using the calculated cumulative hit ratio, predicting the number of consecutive performances.
- the unit period may be set based on the casting time or the length of the cast pieces.
- the reference range may be set within a range of 3mm based on the molten steel level in the mold.
- the hit rate can be obtained using a value obtained by dividing the number of abnormalities measured during a unit period by the total number of measurements.
- the cumulative hit rate may be calculated by cumulatively multiplying the hit rate per unit period.
- a method for predicting a soft lead of the present invention comprising: adjusting an opening amount of a stopper to maintain a constant level of the surface of a mold; Measuring the position of the stopper periodically during a unit cycle and calculating a current cycle opening rate using the position information measured during the unit cycle; Calculating a current opening rate change rate using the current period opening rate and the full period opening rate; And calculating a cumulative change rate using the current opening degree change rate and a previous opening change rate, and predicting the number of consecutive performances using the calculated cumulative change rate.
- the unit period may be set based on the casting time or the length of the cast pieces, the opening degree may be an average value of the collected position information.
- the cumulative change rate is calculated by multiplying the current opening degree change rate and the previous opening degree change rate cumulatively, and can use the calculated cumulative change rate to predict the number of consecutive performances.
- the cumulative change rate is calculated using the position change amount of the stopper in the tundish, and the degree of plugging of the immersion nozzle is predicted using the calculated cumulative change rate, thereby reducing productivity decrease due to a situation such as a decrease in casting speed or stoppage of cast casting.
- FIG. 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 diagram illustrating an apparatus for estimating a number of consecutive weeks according to an embodiment of the present invention.
- FIG. 3 is a view showing a decrease in peripheral speed according to the amount of fluctuations in the level of molten metal in the mold.
- FIG. 4 is a flowchart illustrating a process of predicting a number of consecutive weeks in FIG. 2 according to an embodiment of the present invention.
- 5 and 6 are diagrams for explaining the cumulative hit ratio according to the amount of fluctuation of the surface of the mold.
- FIG. 7 is a diagram illustrating an apparatus for estimating a number of years according to another embodiment of the present invention.
- FIG. 8 is a diagram showing the decrease in the peripheral speed according to the position (opening) change amount of the stopper.
- FIG. 9 is a flowchart illustrating a process of predicting annual frequency of FIG. 7 according to another embodiment of the present invention.
- FIGS 10 and 11 are diagrams for explaining the cumulative change rate according to the position change amount of the stopper.
- FIG. 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 method in which molten metal is solidified in a mold without a bottom and continuously drawn out a cast or steel ingot. Continuous casting is used to make long products with simple cross-sections, such as squares, rectangles, and circles, as well as slabs, blooms and billets, which are mainly for rolling.
- Figure 1 illustrates a vertical curved type.
- 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.
- the supply rate of molten metal flowing into the mold 30 is adjusted, distribution of molten metal into each mold 30, storage of molten metal, separation of slag and nonmetallic inclusions, and the like are performed.
- the mold 30 is typically made of water-cooled copper and allows the molten steel to be primary cooled.
- the mold 30 forms a hollow portion in which molten steel is accommodated as a pair of structurally facing surfaces are opened.
- the mold 30 includes a pair of barriers and a pair of end walls connecting the barriers.
- the short 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 shrinkage due to 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 the cast steel drawn from the mold 30 maintains its shape and a strong solidification angle or solidified shell 81 is formed so that molten metal which is still less solidified does not flow out. It plays a role.
- the water cooling structure includes a method using a copper pipe, a method of drilling a water cooling groove in a copper block, and a method of assembling a copper pipe 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.
- Lubricants include splattered flat oil 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 in order to inject the powder into the mold 30, a powder feeder 50 is installed. The part for discharging the powder of the powder feeder 50 faces 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 spray means 65 for spraying water while maintaining the solidification angle by the support roll 60 not to be 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.
- the ladle 10 is provided with a shroud nozzle 15 extending toward the tundish 20.
- the shroud nozzle 15 extends to be submerged in the molten steel in the tundish 20 so that the molten steel M is not exposed to air and oxidized and nitrided.
- the molten steel M in the tundish 20 flows into the mold 30 by a submerged entry nozzle 25 extending into the mold 30.
- the immersion nozzle 25 is disposed in the center of the mold 30 so that the flow of molten steel M discharged from both discharge ports of the immersion nozzle 25 can be 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 corresponding to the immersion nozzle 25. Specifically, the stopper 21 may be vertically moved along the same line as the immersion nozzle 25 to open and close the inlet of the immersion nozzle 25.
- Control of the flow of the molten steel M through the immersion nozzle 25 may use a slide gate method, which is 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 sheet material slides in the horizontal direction in the tundish 20.
- the molten steel M in the mold 30 starts to solidify from the part in contact with the wall surface forming the mold 30. This is because heat is more likely to be lost by the mold 30 in which the periphery is cooled rather than the center of the molten steel M.
- the back portion along the casting direction of the casting cast piece 80 forms a shape in which the non-solidified molten steel 82 is wrapped in the solidified shell 81.
- the unsolidified molten steel 82 moves together with the solidified shell 81 in the casting direction.
- the uncondensed molten steel 82 is cooled by the spray means 65 for spraying the cooling water in the above movement process. This causes the thickness of the non-solidified molten steel 82 in the playing cast 80 to gradually decrease.
- the cast steel 80 reaches one point 85, the cast steel 80 is filled with the solidification shell 81 of the entire thickness.
- the solidified cast piece 80 is cut to a certain size at the cutting point 91 is divided into slabs (P) such as slabs.
- FIG. 2 is a diagram illustrating an apparatus for estimating a soft frequency according to an embodiment of the present invention, wherein the prediction apparatus 100 includes a water level sensor 110, a storage unit 130, a display unit 140, an input unit 150, and It comprises a control unit 160.
- the prediction apparatus 100 includes a water level sensor 110, a storage unit 130, a display unit 140, an input unit 150, and It comprises a control unit 160.
- the surface level sensor 110 is fixedly disposed on the upper side of the mold to periodically measure the surface level according to the flow of the surface of the molten steel in the mold.
- the water level sensor 110 may be an eddy current type sensor 110 for measuring the level of the water level by analyzing the induced voltage caused by the eddy current of the molten steel according to the excitation of the high frequency current.
- the storage unit 130 stores a unit cycle for measuring the level of the water level, a reference range for determining an abnormality of the level of the water level, a periodically measured level of the water level, a rate of hitting the surface, and a cumulative hit rate.
- the display unit 140 may graphically display the tangential level collected by the tang level sensor 110, the tangential hit rate and the cumulative hit rate per hour, and the like.
- the input unit 150 is configured to receive various operation commands or setting reference values from the outside and transmit them to the control unit 160.
- the control unit 160 collects the water level level value measured by the water level level sensor 110, and uses the total number of times measured during a set unit cycle and the water level level using the abnormal number outside the set reference range.
- the cumulative hit rate is calculated by accumulating the calculated hit surface hit ratio to the previous hit surface hit ratio, and using the calculated cumulative hit ratio, the number of consecutive performances is predicted.
- the reference range may be set within a range of 3mm based on the molten steel level in the mold. For example, when the molten steel level is 800 mm, the reference range may be set within a range of 797 to 803 mm.
- the unit period may be set based on the casting time (for example, 10 minutes) or the length of the casting piece 80 (for example, 20 m).
- the control unit 160 may count the measurement time when the unit cycle is time, and when the unit cycle is the length of the cast steel 80, the control unit 160 may know the length of the cast steel 80.
- the water level level measured by the water level sensor 110 is collected, and the number of abnormalities collected during the set unit period outside the set reference range is divided by the total number of times measured during the unit period.
- the hit rate is calculated, the cumulative hit rate is calculated by accumulating and multiplying the calculated hit level by the previous hit level, and then predicting the number of consecutive performances using the calculated hit rate.
- the degree of blockage of the immersion nozzle is predicted in advance by using the amount of fluctuation in the level of the surface of the mold, thereby preventing a decrease in productivity due to an unexpected decrease in casting speed or interruption of cast casting.
- FIG. 4 is a flowchart illustrating a process of predicting a number of consecutive weeks according to FIG. 2, with reference to the accompanying drawings.
- FIG. 4 is a flowchart illustrating a process of predicting a number of consecutive weeks according to FIG. 2, with reference to the accompanying drawings.
- control unit 160 calculates the peripheral speed at the time of continuous casting through the rotational speed of the pinch roll 70, and determines whether the calculated peripheral speed is the target peripheral speed. When the casting speed reaches the target speed, the annual number prediction process begins.
- the control unit 160 When the casting speed reaches the target circumferential speed, the control unit 160 periodically collects the surface level of the molten steel in the mold from the surface level sensor 110 and stores the collected surface level with time information.
- the storage unit 130 is sequentially stored.
- the water level sensor 110 measures the water level in accordance with the flow of the molten steel in the mold periodically (for example, 1 second unit) and transmits it to the control unit 160 (S11, S12).
- the control unit 160 calculates the unit cycle previously stored in the storage unit 130 to continuously determine whether the set unit cycle has elapsed (S13). If the unit cycle is the casting time, the control unit 160 will count the time, and if the unit cycle is the length of the cast steel 80, it will calculate the length of the cast steel 80 using the circumferential speed.
- the unit cycle may be about 1 to 10 minutes or about 1 to 20m.
- the control unit 160 When the set unit cycle has elapsed, the control unit 160 counts the total number of times of measurement during the unit cycle collected in the storage unit 130 (S14). Subsequently, the control unit 160 compares each collected surface level value and the set reference range with each other during the unit cycle to count the number of abnormalities in which the surface level is out of the reference range (S15).
- the reference range may be set within a range of 3 mm based on the molten steel level in the mold.
- the control unit 160 calculates the hit rate HR ML using the total number of measurement counts and the number of abnormalities counted as described above (S16).
- the method for calculating the hit rate HR ML is shown in Equation 1 below.
- the total number of times of measurement is the number of times the level is measured during the unit cycle
- the number of abnormal times is the number of times the level of the measured level during the unit period is out of the reference range.
- the unit cycle is 10m (the length of the cast steel), 100 times (the total number of times of measurement) during the unit cycle is measured, and the number of times that each measured level is outside the reference range is 5 times (the number of abnormal times). If it were, the hit ratio would be 0.95 (1- (5/100)).
- the hit surface hit ratio thus obtained is stored in the storage unit 130 together with the time information (S17).
- the control unit 160 obtains the hit rate per hit period per unit period and then checks whether there is a previous hit rate stored in the storage unit 130 (S18). If there is a previous hit surface hit ratio stored in the storage unit 130, the control unit 160 calculates a cumulative hit ratio by multiplying the calculated hit surface hit ratio by the cumulative hit surface hit ratio (S19). For example, if the previous hit surface hit ratio is 0.98 and the current hit surface hit ratio is 0.95, the cumulative hit ratio will be 0.93 (0.98 ⁇ 0.95).
- the control unit 160 predicts the number of consecutive performances through the cumulative hit rate (S20). According to the cumulative hit ratio (HR ACC ), the number of possible performances is shown in Table 1.
- the cumulative hit ratio As shown in Table 1, if the cumulative hit ratio is 0.95 or more, the number of consecutive casts is at least + 2Heat. If the cumulative hit ratio is 0.90 or more and less than 0.95, the number of consecutive casts is + 1Heat.If the cumulative hit ratio is less than 0.90, only the current casting is performed. Note stops.
- 1Heat means casting of molten steel contained in one ladle.
- the number of possible performance stars is + 2Heat, where the number of performance stars is not a cumulative value, but means the number of performance stars from the current cumulative hit rate.
- the present invention by predicting the degree of blockage of the immersion nozzle by using the amount of change in the level of the surface of the mold, it is possible to predict and prevent the factor of productivity decrease, such as a decrease in casting speed or stop casting of the lead cast.
- FIG. 7 is a diagram illustrating an apparatus for estimating a soft frequency according to another exemplary embodiment of the present invention, wherein the prediction apparatus 200 includes a water level sensor 210, a lifting unit 220, a storage unit 230, and a display unit 240. It comprises an input unit 250 and a control unit 260.
- the prediction apparatus 200 includes a water level sensor 210, a lifting unit 220, a storage unit 230, and a display unit 240. It comprises an input unit 250 and a control unit 260.
- the surface level sensor 210 is disposed and fixed on the upper side of the mold to periodically measure the surface level according to the flow of the surface of the molten steel in the mold.
- the water level sensor 210 may be an eddy current type sensor 210 that analyzes an induced voltage caused by eddy current of molten steel according to excitation of a high frequency current to measure the level of water level.
- Lifting means 220 is configured to adjust the amount of lifting by vertically elevating the stopper 21 for adjusting the amount of molten steel pulled out of the tundish to the mold.
- the lifting means 220 may include a support for fixing and supporting the stopper 21 and an actuator such as a motor, a hydraulic cylinder, or an air cylinder for elevating the stopper 21 through the support.
- the actuator further includes a position detection sensor 225 for detecting a lift position based on a reference point of the stopper 21 (a position where the stopper completely closes the tap hole 20a).
- the lifting position of the stopper 21 may be a distance from a reference point.
- the storage unit 230 includes measurement position information of the stopper 21, the opening rate of the stopper 21, the opening change rate, the cumulative change rate, the period for measuring the opening amount of the stopper 21, and a unit for calculating the opening rate. Information about the cycle is stored.
- the display unit 240 may graphically display the position, the opening degree change rate, and the cumulative change rate of the stopper 21 measured according to the control signal.
- the input unit 250 is configured to receive various operation commands or setting reference values from the outside and transmit them to the control unit 260.
- the control unit 260 collects the position information of the stopper 21 through the position detection sensor 225 of the lifting means 220 for a set unit period, and the current period opening degree of the stopper 21 using the collected position information. After calculating the rate, the current opening rate is calculated by using the current and full-cycle opening rates, and the number of annual performances is predicted using the calculated current opening rate and the previous opening rate. Here, the control unit 260 calculates the cumulative change rate by multiplying the current opening degree change rate and the previous opening degree change rate cumulatively, and predicts the number of consecutive performances using the calculated cumulative change rate.
- the unit period may be set based on the casting time (for example, 10 minutes) or the length of the casting piece 80 (for example, 20 m).
- the control unit 260 may count the measurement time when the unit cycle is time, and when the unit cycle is the length of the cast steel 80, the casting length of the cast steel 80 can be known by using the circumferential speed.
- the level of the water level is measured through the level of the water level sensor 210, and by adjusting the opening amount of the stopper 21 according to the measured level of the water level, the level of the water level is kept constant at the set level. Therefore, in the present invention, after the position (opening amount) of the stopper 21 is periodically measured to calculate the opening degree, the opening degree change rate is calculated using the current period opening rate and the total period opening rate, and the opening degree change rate is calculated according to the calculated opening degree. By indirectly determining whether the immersion nozzle 25 is blocked by using the cumulative change rate, it is possible to predict the number of possible performances.
- the degree of clogging of the immersion nozzle 25 is predicted in advance by using the opening change rate and the cumulative change rate of the stopper 21 in the mold, thereby reducing productivity due to an unexpected decrease in casting speed or interruption of cast casting. It is to be prevented.
- FIG. 9 is a flowchart illustrating a process of predicting a number of consecutive years according to FIG. 7.
- FIG. 9 will be described with reference to the accompanying drawings.
- control unit 260 calculates the peripheral speed at the time of continuous casting through the rotational speed of the pinch roll 70, and determines whether the calculated peripheral speed is the target peripheral speed. When the casting speed reaches the target speed, the annual number prediction process begins.
- the control unit 260 When the casting speed reaches the target circumferential speed, the control unit 260 periodically collects the surface level value according to the flow of the surface of the molten steel in the mold from the surface level sensor 210, so that the surface level is kept constant at the set reference level.
- the position of the stopper 21 is adjusted through the lifting means 220 (S21).
- the water level reference level may be set within a range of 8003mm.
- the control unit 260 periodically checks the position of the stopper 21 through the position detecting means built in the lifting means 220 during the unit period (for example, in units of 10 seconds). Collected by measuring (S22).
- the position of the stopper 21 may be a distance from a reference point when the stopper 21 completely closes the tap hole 20a, and the position of the stopper 21 means an opening amount.
- the unit cycle may be a casting time or a casting length. If the unit cycle is a casting time, the control unit 260 will count the time, and if the unit cycle is the casting length of the cast steel 80, the main speed is used. To calculate the length of the cast piece (80). For example, the unit period may be about 1 to 10 minutes or about 1 to 20m.
- the position of the stopper 21 may be less than 60mm, the normal casting may be about 25mm as shown in Figure 8, the less the amount of molten steel to be cast into the mold through the immersion nozzle 25, In other words, as the level of the surface of the mold is lowered, the position of the stopper 21 is increased to increase the opening amount.
- control unit 260 periodically collects the position information of the stopper 21, and calculates the current period opening rate by obtaining an average value of the position information when a predetermined unit time elapses (S23, S24). That is, the current period opening rate may be an average value of location information.
- the control unit 260 calculates the current opening degree change rate by using the current period opening rate and the advance period opening rate previously stored in the storage unit 230. (S25).
- the method of calculating the opening degree change rate is shown in Equation 2 below.
- the current opening degree change rate will be 0.833 (1- (5/30)).
- the opening change rate using the opening rate is used, which is used because the opening rate is slightly different depending on the installation or installation state.
- the current opening degree change rate thus obtained is stored in the storage 230 together with the time information.
- the control unit 260 determines the current opening degree change rate and then checks whether there is a previous opening degree change rate stored in the storage unit 230. If there is a previous opening degree change rate stored in the storage unit 230, the control unit 260 calculates a cumulative change rate by multiplying the calculated current opening degree change rate by the cumulative previous opening degree change rate (S26). For example, if the previous opening change rate is 0.921 and the current opening change rate is 0.833, the cumulative change rate will be 0.767 (0.921 x 0.833). That is, the cumulative change rate can be obtained by the following Equation 3.
- control unit 260 predicts the number of consecutive performances through the cumulative change rate (S27).
- the number of possible performances according to the cumulative change rate is shown in Table 2 below.
- the cumulative change rate is 0.85 or more, the number of consecutive casts is at least + 2Heat, and if the cumulative change rate is more than 0.80 to less than 0.85, the number of consecutive casts is + 1Heat, and if the cumulative change rate is less than 0.80, only the current casting is performed. Note stops.
- 1Heat means casting of molten steel contained in one ladle.
- the number of possible performances is + 2Heat, where the number of performances is not a cumulative value but means the number of performances available from the current cumulative rate of change.
- the cumulative change rate is gradually changed without a sudden change. It was found to decrease.
- the cumulative change rate is at least the annual performance reference value ⁇ , and when the cumulative change rate is 0.8 or more, the continuous performance standard, continuous performance is possible.
- the position of the stopper 21 measured by the position detection sensor 225 of the lifting means 220 is maintained without a large change for a predetermined time, and after approximately 2.5 hours [Hour] elapses d
- the position of the stopper 21 changes abruptly.
- the cumulative rate of change was also sharply lowered to less than 0.8, which is the standard performance standard ( ⁇ ). In this case, casting will be discontinued, predicting that the next performance will be impossible.
- the performance-based prediction method as described above 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.
- control unit 220 lifting means
Abstract
Description
누적 적중률(HRACC) | 연연주 가능수 | 설명 |
0.95≤HRACC≤1.00 | + 2Heat | 2Heat의 연연주가 가능함 |
0.90≤HRACC<0.95 | + 1Heat | 1Heat의 연연주가 가능함 |
HRACC<0.90 | 0Heat(주조 중단) | 다음 연연주는 중단함 |
누적 변화율 | 연연주 가능수 | 설명 |
0.85≤누적변화율≤1.00 | + 2Heat | 2Heat의 연연주가 가능함 |
0.80≤누적변화율<0.85 | + 1Heat | 1Heat의 연연주가 가능함 |
누적변화율<0.80 | 0Heat(주조 중단) | 다음 연연주는 중단함 |
Claims (13)
- 몰드내 용강의 탕면 유동에 따른 탕면레벨값을 주기적으로 측정하는 단계;설정된 단위주기가 경과되면, 상기 단위주기동안 측정된 총 측정횟수와 각 탕면 레벨값이 설정된 기준범위를 벗어난 이상 횟수를 각각 카운트하는 단계;상기에서 카운트된 총 측정횟수와 이상 횟수를 이용하여 탕면 적중률을 계산하는 단계; 및상기에서 계산된 탕면 적중률을 이전 탕면 적중률에 누적하여 누적 적중률을 산출하고, 산출된 누적 적중률을 이용하여 연연주 가능수를 예측하는 단계;를 포함하는 연속주조시 연연주수 예측 방법.
- 청구항 1에 있어서,상기 단위주기는 주조 시간 또는 연주주편의 길이를 기준으로 설정되는 연속주조시 연연주수 예측 방법.
- 청구항 1에 있어서,상기 기준범위는 몰드내 용강레벨을 기준으로 3mm 이내의 범위로 설정되는 연속주조시 연연주수 예측 방법.
- 청구항 1에 있어서,상기 탕면 적중률은 단위주기동안 측정된 이상 횟수를 총 측정횟수로 나눈 값을 이용하여 획득되는 연속주조시 연연주수 예측 방법.
- 청구항 1에 있어서,상기 누적 적중률은 단위주기당 탕면 적중률을 누적으로 곱함에 따라 산출되는 연속주조시 연연주수 예측 방법.
- 청구항 1에 있어서,상기에서 누적 적중률이 0.9 미만일 경우에는 연연주를 중단하는 연속주조시 연연주수 예측 방법.
- 몰드 내 탕면 레벨이 일정하게 유지되도록 스토퍼의 개도량을 조절하는 단계;상기 스토퍼의 위치를 단위주기동안 주기적으로 측정하고, 단위주기동안 측정된 위치정보를 이용하여 현주기 개도율을 산출하는 단계;상기 현주기 개도율과 전주기 개도율을 이용하여 현재 개도변화율을 산출하는 단계; 및상기 현재 개도변화율과 이전 개도변화율을 이용하여 누적 변화율을 산출하고, 산출된 누적 변화율을 이용하여 연연주 가능수를 예측하는 단계;를 포함하는 연속주조시 연연주수 예측 방법.
- 청구항 8에 있어서,상기 단위주기는 주조 시간 또는 연주주편의 길이를 기준으로 설정되는 연속주조시 연연주수 예측 방법.
- 청구항 8에 있어서,상기 개도율은 수집된 위치정보들의 평균값인 연속주조시 연연주수 예측 방법.
- 청구항 8에 있어서,상기 누적 변화율은 현재 개도변화율과 이전 개도변화율을 누적으로 곱함에 따라 산출되는 연속주조시 연연주수 예측 방법.
- 청구항 8에 있어서,상기에서 누적 변화율이 0.8 미만일 경우에는 연연주를 중단하는 연속주조시 연연주수 예측 방법.
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JP2014513462A JP5770371B2 (ja) | 2011-09-28 | 2012-09-25 | 連続鋳造の際の連連鋳数の予測方法 |
CN201280027398.7A CN103596713B (zh) | 2011-09-28 | 2012-09-25 | 用于在连续浇铸时预测连续浇铸工艺次数的方法 |
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KR10-2011-0111268 | 2011-10-28 | ||
KR1020110111268A KR101320356B1 (ko) | 2011-10-28 | 2011-10-28 | 연속주조시 연연주수 예측 장치 및 그 방법 |
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CN113134587A (zh) * | 2020-01-17 | 2021-07-20 | 宝山钢铁股份有限公司 | 一种通过塞棒开口度变化趋势判断水口堵塞和溶损的方法 |
CN114101645A (zh) * | 2020-08-27 | 2022-03-01 | 秦皇岛秦冶重工有限公司 | 一种钢水流速调整方法及装置 |
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TWI633953B (zh) * | 2017-02-15 | 2018-09-01 | 國立高雄科技大學 | 射蠟機之成品產出量的計算方法 |
CN110586891A (zh) * | 2019-09-30 | 2019-12-20 | 河钢股份有限公司 | 一种连铸结晶器液面控制精度的评价方法 |
CN113310537B (zh) * | 2021-04-19 | 2022-06-28 | 中国原子能科学研究院 | 一种主动冷却型真空环境高温液态金属流量计 |
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DE112012002064T5 (de) | 2014-02-06 |
CN103596713B (zh) | 2015-07-22 |
DE112012002064T8 (de) | 2014-03-06 |
WO2013048083A3 (ko) | 2013-05-23 |
JP5770371B2 (ja) | 2015-08-26 |
DE112012002064B4 (de) | 2017-05-11 |
DE112012002064T9 (de) | 2014-04-10 |
JP2014515318A (ja) | 2014-06-30 |
CN103596713A (zh) | 2014-02-19 |
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