WO2014027543A1 - 凝固完了位置制御方法及び凝固完了位置制御装置 - Google Patents

凝固完了位置制御方法及び凝固完了位置制御装置 Download PDF

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Publication number
WO2014027543A1
WO2014027543A1 PCT/JP2013/069693 JP2013069693W WO2014027543A1 WO 2014027543 A1 WO2014027543 A1 WO 2014027543A1 JP 2013069693 W JP2013069693 W JP 2013069693W WO 2014027543 A1 WO2014027543 A1 WO 2014027543A1
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Prior art keywords
slab
temperature
completion position
solidification completion
heat transfer
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PCT/JP2013/069693
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English (en)
French (fr)
Japanese (ja)
Inventor
浅野　一哉
島本　拓幸
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Ｊｆｅスチール株式会社
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to CN201380042003.5A priority Critical patent/CN104540617B/zh
Priority to KR1020157003686A priority patent/KR101709623B1/ko
Priority to IN1066DEN2015 priority patent/IN2015DN01066A/en
Priority to JP2013558835A priority patent/JP5585739B2/ja
Publication of WO2014027543A1 publication Critical patent/WO2014027543A1/ja

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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
    • 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

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  • the present invention estimates the temperature of a cast slab in a continuous casting machine, and controls a solidification completion position control method for controlling a solidification state of the slab such as a solidification completion position and a solidification completion position control. Relates to the device.
  • the slab of the slab is bent and straightened in a straightening section (bending and straightening zones) that bends the slab drawn from directly under the mold vertically downward. It is necessary to set the secondary cooling constraints so that the temperature does not enter the brittle temperature range.
  • Patent Document 1 virtually generates a calculation plane perpendicular to the casting direction in the slab during continuous casting every time casting of a predetermined length proceeds.
  • this technology is based on the average cooling condition of the zone that passed immediately before when the calculation surface passes through a plurality of zones set continuously in the casting direction and reaches the next zone entry boundary.
  • this technology gives the temperature distribution in the obtained calculation plane as the initial value of the calculation to be performed after the next zone, and calculates the temperature distribution in the calculation plane sequentially, thereby calculating at the final zone entry boundary
  • the in-plane temperature distribution is obtained to estimate the solidification state.
  • JP 2002-178117 A Japanese Patent Laid-Open No. 9-24449 Japanese Patent Laid-Open No. 10-291060
  • the solidification state of a slab is confirmed by performing the nail shooting method on the slab, and the parameters of the heat transfer model are adjusted based on the confirmation result.
  • the consistency with the actual coagulation state is compensated.
  • the operation which trusted the calculation result in that state is performed.
  • the solidification state is estimated by calculation. The result is different from the actual one, and the solidification state of the slab cannot be estimated with high accuracy.
  • Patent Document 2 In order to solve such problems, techniques described in Patent Document 2 and Patent Document 3 have been proposed. Specifically, the technique described in Patent Document 2 is based on the temperature and control of the slab obtained as a result of casting based on the flow rate command of the cooling spray set using a control model that formulates the physical phenomenon of the continuous casting machine. The parameter of the control model is corrected from the difference between the slab temperature calculated using the model. The technique described in Patent Document 3 corrects the heat flux distribution from the surface of the slab so that the calculated value of the surface temperature at the measurement point of the slab matches the measured value.
  • the measured value and the calculated value of the slab temperature can be matched at the measurement point by correcting the parameters of the model.
  • the calculated value of the internal temperature of the slab does not coincide with the actual internal temperature, there is no guarantee that the solidification state can be estimated with high accuracy even if the corrected model is used. For this reason, there exists a possibility that the solidification completion position of a slab may remove
  • the temperature of the slab in the straightening part is applied to the embrittlement region, which may cause a quality trouble that causes cracks on the surface of the slab. Further, there is no description of a technique for performing control for correcting the solidification completion position of the slab to the original target position.
  • the present invention has been made in view of the above problems, and its purpose is to accurately estimate the slab temperature (internal temperature and surface temperature of the slab) and complete the solidification capable of controlling the solidification state of the slab.
  • An object is to provide a position control method and a coagulation completion position control device.
  • a solidification completion position control method for controlling a solidification completion position of a slab in a continuous casting machine,
  • a temperature measurement step for measuring the surface temperature of the slab at at least one point in the casting direction, and a temperature for estimating the surface temperature of the slab at the measurement location in the temperature measurement step by a heat transfer model using the operating conditions of the continuous casting machine
  • the thermal conductivity included in the heat transfer model so that the estimated value and the measured value of the surface temperature of the slab in the temperature measuring step match the estimated value of the surface temperature of the slab in the temperature estimating step
  • a correction step for correcting at least one parameter of a heat transfer coefficient between the mold and the solidified shell and a heat transfer coefficient of the secondary cooling zone, and the correction
  • the slab temperature including the surface temperature and the internal temperature of the slab is estimated by a heat transfer model using parameters corrected by the step, and the slab of the slab in the continuous casting machine is estimated based on the estimated internal temperature of the slab.
  • the operation amount of the secondary cooling water amount is calculated from the deviation between the solidification completion position estimation step for estimating the solidification completion position, and the solidification completion position estimation value obtained in the solidification completion position estimation step and the predetermined solidification completion position target value.
  • An operation amount calculation step to calculate, and a parameter obtained by substituting a secondary cooling water amount obtained by adding the operation amount calculated in the operation amount calculation step to a parameter that is a function of the secondary cooling water amount corrected in the correction step was used.
  • the heat transfer model estimates the slab temperature in the continuous casting machine, and estimates the solidification completion position of the slab in the continuous casting machine based on the estimated internal temperature of the slab.
  • a state estimation step, a determination step for determining whether a slab temperature and a solidification completion position estimated in the solidification state estimation step satisfy a predetermined operational constraint, and the constraint condition in the determination step includes: An operation step for controlling secondary cooling based on the operation amount calculated in the operation amount calculation step.
  • the solidification completion position control method is characterized in that, in the above invention, the limiting conditions in the determination step are an allowable range of the solidification completion position and a temperature range of the correction portion.
  • the solidification completion position control device is a solidification completion position control device for controlling the solidification completion position of a slab in a continuous casting machine, and the surface temperature of the slab at at least one point in the casting direction in the continuous casting machine.
  • a temperature measuring means for measuring the temperature a temperature estimating means for estimating a surface temperature of the slab at a measurement location by the temperature measuring means by a heat transfer model using operating conditions of a continuous casting machine, and a slab by the temperature measuring means
  • a correction means for correcting at least one parameter of the heat transfer coefficient of the secondary cooling zone, and a heat transfer model using the parameter corrected by the correction means.
  • a solidification completion position estimating means for estimating a solidification completion position of the slab in the continuous casting machine based on the estimated slab temperature including the temperature and the internal temperature, and based on the estimated internal temperature of the slab;
  • An operation amount calculating means for calculating an operation amount of the secondary cooling water amount from a deviation between a solidification completion position estimated value obtained by the means and a predetermined solidification completion position target value; and secondary cooling corrected by the correction means.
  • the slab temperature in the continuous casting machine is estimated by a heat transfer model using a parameter obtained by substituting the amount of secondary cooling water obtained by adding the amount of operation calculated by the operation amount calculation means to the parameter that is a function of the amount of water.
  • Solidification state estimation means for estimating the solidification completion position of the slab in the continuous casting machine based on the internal temperature of the cast slab, and the slab temperature and solidification completion estimated by the solidification state estimation means
  • a determination means for determining whether or not a predetermined operational constraint condition is satisfied, and the operation amount calculated by the operation amount calculation means when the determination means determines that the constraint condition is satisfied.
  • the slab temperature can be estimated with high accuracy and the solidification state of the slab can be controlled.
  • FIG. 1 is a schematic diagram showing a configuration of a continuous casting machine to which a solidification completion position estimation device according to an embodiment of the present invention is applied.
  • FIG. 2 is a block diagram showing the configuration of the coagulation completion position estimation apparatus that is an embodiment of the present invention.
  • FIG. 3 is a flowchart showing a flow of solidification state control processing according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating changes in the measured value of the surface temperature of the slab at the position where the surface thermometer is disposed and the estimated value of the surface temperature of the slab before and after correction of the parameters.
  • FIG. 5 is a diagram exemplifying a temperature change in the center part in the thickness direction of the slab before and after the correction of the parameters.
  • FIG. 1 is a schematic diagram showing a configuration of a continuous casting machine to which a solidification completion position estimation device according to an embodiment of the present invention is applied.
  • FIG. 2 is a block diagram showing the configuration of the coagulation completion position estimation apparatus
  • FIG. 6 is a diagram exemplifying a temperature change in the central portion in the thickness direction of the slab before and after the operation of the secondary cooling water amount.
  • FIG. 7 is a diagram illustrating the temperature change of the surface temperature of the slab before and after the operation of the secondary cooling water amount.
  • FIG. 8 is a diagram illustrating the temperature change of the surface temperature of the slab before and after satisfying the constraint condition.
  • FIG. 9 is a diagram exemplifying a temperature change in the central portion in the thickness direction of the slab before and after satisfying the constraint condition.
  • FIG. 1 is a schematic diagram showing a configuration of a continuous casting machine to which a solidification completion position control device according to an embodiment of the present invention is applied.
  • a mold 4 is provided below a tundish 3 filled with molten steel 2
  • An immersion nozzle 5 serving as a molten steel supply port to the mold 4 is provided at the bottom of the tundish 3.
  • a support roll 6 is installed below the mold 4 in the vertical direction.
  • a plurality of cooling zones 7a to 13a and 7b to 13b are arranged as secondary cooling zones.
  • a plurality of spray or air mist spray nozzles are arranged in each cooling zone, and secondary cooling water is sprayed onto the surface of the slab S from each nozzle.
  • the symbol “a” is shown in the cooling zone on the opposite side of the base plane (upper side), and the cooling zone on the base side (lower side) is shown. Shows the symbol b.
  • a surface thermometer 14 for measuring the surface temperature of the slab S is disposed.
  • the surface thermometer 14 is disposed in the vicinity of the entrance side of the final cooling zones 13a and 13b.
  • the surface thermometer 14 may be disposed between the cooling zones on the more upstream side.
  • FIG. 2 is a block diagram showing a configuration of a solidification completion position control apparatus according to an embodiment of the present invention.
  • a coagulation completion position control device 100 according to an embodiment of the present invention is configured by an information processing device such as a workstation or a personal computer.
  • the solidification completion position control device 100 functions as a temperature calculation unit 101, a parameter correction unit 102, and a solidification completion position control unit 103 when an arithmetic processing device such as a CPU in the information processing apparatus executes a control program. The functions of these units will be described later.
  • the coagulation completion position control device 100 is connected to a surface thermometer 14 and an output device 110 such as a display device or a printing device.
  • Solidification control process The solidification completion position control apparatus 100 having such a configuration performs the solidification state control process shown below, thereby satisfying the operational constraints such as the temperature range of the correction portion while satisfying the operational restriction conditions of the slab S. To correct.
  • the operation of the coagulation completion position control device 100 when executing this coagulation state control process will be described with reference to the flowchart shown in FIG.
  • FIG. 3 is a flowchart showing the flow of solidification state control processing according to an embodiment of the present invention.
  • the flowchart shown in FIG. 3 starts when the continuous casting machine is operated, for example, at the timing when the slab S passes the position where the surface thermometer 14 is disposed, and the solidification state control process proceeds to the process of step S1.
  • step S1 the temperature calculation unit 101 measures the surface temperature of the slab S at the position where the surface thermometer 14 is disposed. Thereby, the process of step S1 is completed and the solidification state control process proceeds to the process of step S2.
  • the temperature calculation unit 101 performs surface cooling of the slab S at the position where the surface thermometer 14 is disposed by secondary cooling calculation (heat transfer calculation regarding secondary cooling of the slab using a heat transfer model). Calculate the estimated temperature.
  • a two-dimensional heat transfer equation expressed by the following formula (1) is considered, considering a slab section sliced into unit lengths in the casting direction.
  • it is executed by giving and solving the heat flow rate (see Equation (2)) of the boundary condition of the slab surface in various situations such as water cooling, air cooling, mist cooling, and heat removal from the roll. Since the secondary cooling calculation itself is known at the time of filing of the present invention, a detailed description is omitted.
  • Equation (3) c is the specific heat of the slab S
  • ⁇ is the density of the slab S
  • k is the thermal conductivity of the slab S
  • T is the surface temperature of the slab S
  • x and y are the slabs, respectively. It is a coordinate value showing the position of the thickness direction of S and the width direction.
  • step S2 calculates the estimated value of the surface temperature of the slab S using pre given h, h m, k as an initial parameter. Thereby, the process of step S2 is completed and the solidification state control process proceeds to the process of step S3.
  • the parameter correcting unit 102 includes the thermal conductivity k included in the formula (1) and the formula (3) so that the estimated value of the surface temperature obtained by the process of step S2 matches the measured value.
  • the value of at least one parameter of the heat transfer coefficient h m between the mold inner wall and the solidified shell included in, and the heat transfer coefficient h of the secondary cooling zone included in Equation (2) is corrected.
  • the heat transfer coefficient h of the secondary cooling zone for correcting the heat transfer coefficients h m between the thermal conductivity k, the mold inner wall and the solidified shell Similarly, the following processing can be applied. Note that the heat transfer coefficient h ′ in the secondary cooling zone after correction can be expressed as the following expression (4) using the correction coefficient ⁇ .
  • the general casting operation conditions for example, molten steel temperature to be poured, cooling conditions in the mold, cast components, dimensions, casting temperature, casting speed, continuous casting machine) Secondary cooling water settings
  • the steel grade is changed, or when there is a change in cooling equipment, aging, or temporary failure, etc. Cooling calculation is possible.
  • the solidification completion position control unit 103 calculates the estimated values of the internal temperature and the surface temperature (slab temperature) of the slab S using the heat transfer model whose parameters are corrected by the process of step S3. Then, the solidification completion position of the slab S is estimated by comparing the estimated temperature of the center portion in the thickness direction of the slab S with the solidus temperature.
  • step S4 by continuously assuming a slab cross-section sliced in a unit length in the casting direction, and performing secondary cooling calculation in each slab cross-section, in the longitudinal direction (casting direction) of the slab S Temperature change can be calculated.
  • the temperature change in the longitudinal direction of the piece S can be calculated.
  • the solidification completion position and shape of the slab S can be estimated by comparing the calculated temperature at the center in the thickness direction of each slab cross section with the solidus temperature.
  • the solidification completion position control unit 103 is based on the deviation between the estimated position of the solidification completion position of the slab S estimated by the process of step S4 and the preset target position of the solidification completion position.
  • the operation amount of the secondary cooling water amount of the slab S is calculated so as to eliminate the deviation.
  • the solidification completion position control unit 103 uses a known method such as a proportional calculation or a proportional integration calculation with respect to the deviation between the estimated position of the solidification completion position and the target position of the solidification completion position. Apply. Thereby, the process of step S5 is completed, and the solidification state control process proceeds to the process of step S6.
  • the heat transfer coefficient h of the secondary cooling zone can be expressed as the following equation (5) as a function of the secondary cooling water amount w.
  • the correction coefficient ⁇ in the above equation (4) is obtained with respect to the heat transfer coefficient h (w), but the heat transfer coefficient h () after the manipulated variable ⁇ w is given to the secondary cooling water quantity w.
  • the relationship between the heat transfer coefficient h (w + ⁇ w) before correction and the heat transfer coefficient h ′ (w + ⁇ w) after correction can be expressed as the following expression (6) by the above expression (4) and expression (5). . Therefore, even if the amount of secondary cooling water is manipulated, it is not necessary to correct again the heat transfer coefficient h 'of the secondary cooling zone corrected in the process of step S3.
  • the amount of secondary cooling water is manipulated, it is only necessary to change h ′ (w) to h ′ (w + ⁇ w).
  • step S6 the solidification completion position control unit 103 substitutes the secondary cooling water amount (w + ⁇ w) obtained by adding the operation amount ⁇ w calculated in the process of step S5 to the parameter h ′ corrected in the process of step S3.
  • the estimated value of the slab temperature (internal temperature and surface temperature) of the slab S is calculated using the heat transfer model using the parameter h ′ (w + ⁇ w), and the solidification completion position is estimated.
  • the solidification completion position control unit 103 determines whether or not the estimated value of the slab temperature calculated in the process of step S6 satisfies the operational constraint.
  • the solidification completion position control unit 103 has, as operational constraints, that the slab temperature in the correction unit is not in the embrittlement region (temperature range where embrittlement occurs) and that the estimated position of the solidification completion position is Check that the target position has a predetermined tolerance.
  • the solidification completion position control unit 103 returns the solidification state control process to the process of step S5 when determining that these constraint conditions are not satisfied. That is, the solidification completion position control unit 103 changes the operation amount of the secondary cooling water amount and repeats the process of estimating the slab temperature until the constraint condition is satisfied. On the other hand, if the solidification completion position control unit 103 determines that the above constraint conditions are satisfied, the solidification state control process proceeds to the process of step S8.
  • the solidification completion position control unit 103 controls the secondary cooling by the cooling water amount (w + ⁇ w) obtained by adding the operation amount ⁇ w of the cooling water amount calculated in the process of step S5 to the initial cooling water amount w. Thereby, the solidification completion position control unit 103 performs control to correct the solidification completion position to the target position. Thereby, the process of step S8 is completed and a series of solidification state control processes are complete
  • the slab temperature and the solidification completion position are estimated with high accuracy, while satisfying the constraints on the surface temperature at the correction part.
  • the solidification completion position can be controlled to be a target position within a predetermined range. Therefore, if the solidification completion position is controlled so as to be at the end of the machine, the equipment capacity of the continuous casting machine can be maximized and high product productivity can be maintained. Also, if the solidification completion position is controlled so as to be in the light pressure zone, it is possible to produce high quality products by preventing deterioration of internal quality such as center segregation.
  • FIG. 4 is a diagram illustrating changes in the measured value of the surface temperature at the position where the surface thermometer 14 is disposed and changes in the estimated value of the surface temperature at the casting position (distance from the mold 4) before and after correction of the parameters.
  • the heat transfer coefficient h in the secondary cooling zone is corrected among the parameters.
  • a line L1 shows the relationship between the casting position and the surface temperature estimated with the parameters before correction
  • a line L2 shows the relationship between the casting position and the surface temperature estimated with the parameters after correction.
  • FIG. 5 is a diagram showing a temperature change in the central portion in the thickness direction before and after the parameter correction.
  • a line L3 shows the relationship between the casting position and the temperature in the central portion in the thickness direction estimated with the parameters before correction
  • a line L4 shows the relationship between the casting position and the central portion in the thickness direction estimated with the parameters after correction.
  • the relationship with temperature is shown.
  • the solidus temperature of the steel type of a present Example is 1500 degreeC
  • the casting position was 29.1 m.
  • the change amount of the heat removal amount due to the secondary cooling is obtained based on the deviation of the estimated solidification completion position from the target position.
  • the change amount of the heat removal amount can be obtained from the relationship between the operation amount of the secondary cooling water and the change in the estimated position of the solidification completion position.
  • FIG. 6 is a diagram showing a temperature change in the central portion in the thickness direction before and after the operation of the secondary cooling water amount.
  • a line L4 indicates the relationship between the casting position and the temperature in the central portion in the thickness direction estimated in the state before the operation
  • a line L5 indicates the central portion in the thickness direction estimated in the state after the casting position and the operation. The relationship with the temperature is shown.
  • the line L4 is the same as the line L4 in FIG.
  • FIG. 7 is a diagram showing the temperature change of the surface temperature before and after the operation of the secondary cooling water amount.
  • line L2 shows the relationship between the casting position and the surface temperature estimated in the state before the operation
  • line L6 shows the relationship between the casting position and the surface temperature estimated in the state after the operation.
  • the line L2 is the same as the line L4 in FIG.
  • FIG. 8 is a diagram showing the temperature change of the surface temperature before and after satisfying the constraint conditions.
  • line L2 is the same as line L2 in FIG. 7, and shows the relationship between the casting position and the surface temperature estimated in the state before the operation of the secondary cooling water amount.
  • a line L6 indicates the relationship between the casting position and the surface temperature estimated before the constraint condition is satisfied in the state after the operation of the secondary cooling water amount, and is the same as the line L6 in FIG.
  • Line L7 shows the relationship between the casting position and the surface temperature estimated after satisfying the constraints in the state after the operation of the secondary cooling water.
  • FIG. 9 is a diagram showing a temperature change in the central portion in the thickness direction before and after satisfying the constraint condition.
  • line L4 is the same as line L4 in FIG. 6, and shows the relationship between the casting position and the surface temperature estimated in the state before the operation of the secondary cooling water amount.
  • a line L5 is the same as the line L5 in FIG. 6 and shows the relationship between the casting position and the surface temperature estimated before satisfying the constraint condition in the state after the operation of the secondary cooling water amount.
  • a line L8 shows the relationship between the casting position and the surface temperature estimated after satisfying the constraint condition in the state after the operation of the secondary cooling water amount.
  • the estimated solidification completion position is set as shown in FIG.
  • the heat removal amount is increased by 7.5% from the current value so as to change from the point P4 to the point P5 (0.8 m toward the mold 4 side).
  • the brittle region surface temperature ⁇ 700 ° C.
  • the amount of increase from the current value of the heat removal amount of the secondary cooling is changed to 5% so as to satisfy the constraint that the surface temperature at the correction portion R1 does not enter the embrittlement region.
  • the surface temperature of the slab S does not enter the embrittlement region at the correction portion R1, and satisfies the constraint condition.
  • the solidification completion position can be controlled to the target position (tolerable range) by satisfying the constraint condition by changing the increase amount from the current value of the heat removal amount of the secondary cooling to 5%.
  • the solidification completion position control method and solidification completion position control device are suitable for a technique for estimating the temperature of a slab in a continuous casting machine and controlling the solidification state of the slab such as a solidification completion position. ing.

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PCT/JP2013/069693 2012-08-14 2013-07-19 凝固完了位置制御方法及び凝固完了位置制御装置 WO2014027543A1 (ja)

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CN201380042003.5A CN104540617B (zh) 2012-08-14 2013-07-19 凝固结束位置控制方法以及凝固结束位置控制装置
KR1020157003686A KR101709623B1 (ko) 2012-08-14 2013-07-19 응고 완료 위치 제어 방법 및 응고 완료 위치 제어 장치
IN1066DEN2015 IN2015DN01066A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 2012-08-14 2013-07-19
JP2013558835A JP5585739B2 (ja) 2012-08-14 2013-07-19 凝固完了位置制御方法及び凝固完了位置制御装置

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JP2012179703 2012-08-14

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JP2019141893A (ja) * 2018-02-22 2019-08-29 日本製鉄株式会社 連続鋳造機の２次冷却制御装置、連続鋳造機の２次冷却制御方法、およびプログラム
WO2020052944A1 (de) * 2018-09-13 2020-03-19 Sms Group Gmbh VERFAHREN ZUR STEUERUNG ODER REGELUNG DER TEMPERATUR EINES GIEßSTRANGS IN EINER STRANGGIEßANLAGE
CN114905020A (zh) * 2022-05-16 2022-08-16 北京科技大学 一种修正连铸过程凝固传热模型的方法

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KR102606935B1 (ko) * 2019-10-03 2023-11-29 제이에프이 스틸 가부시키가이샤 주형내 응고 셸 두께 추정 장치, 주형내 응고 셸 두께 추정 방법 및 강의 연속 주조 방법
CN110802208B (zh) * 2019-11-13 2021-06-08 甘肃酒钢集团宏兴钢铁股份有限公司 一种高纬度地区连铸生产水量调整的方法
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