WO2016035505A1 - Dispositif de commande et procédé de commande pour installation de revenu - Google Patents

Dispositif de commande et procédé de commande pour installation de revenu Download PDF

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Publication number
WO2016035505A1
WO2016035505A1 PCT/JP2015/072370 JP2015072370W WO2016035505A1 WO 2016035505 A1 WO2016035505 A1 WO 2016035505A1 JP 2015072370 W JP2015072370 W JP 2015072370W WO 2016035505 A1 WO2016035505 A1 WO 2016035505A1
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Prior art keywords
temper rolling
shape
steel sheet
hot
rolled steel
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PCT/JP2015/072370
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English (en)
Japanese (ja)
Inventor
舘野　純一
慎也 山口
青江　信一郎
北村　拓也
裕史 津山
隆喜 寺崎
裕紀 米田
横田　修二
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Ｊｆｅスチール株式会社
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Priority claimed from JP2014177066A external-priority patent/JP5971293B2/ja
Priority claimed from JP2014177056A external-priority patent/JP5971292B2/ja
Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Publication of WO2016035505A1 publication Critical patent/WO2016035505A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/56—Elongation control

Definitions

  • the present invention relates to a control device and a control method for a temper rolling mill that are suitable for application to a temper rolling process for correcting the shape of a steel sheet after hot rolling.
  • the steel sheet is subjected to light reduction (elongation rate) within a range of about 0.05 to 3% for the purpose of removing yield elongation, correcting the shape of the steel sheet, and adjusting the surface roughness.
  • elongation rate elongation rate
  • the temper rolling process for hot-rolled steel sheets plays a particularly important role in correcting the steel sheet shape.
  • the shape of the steel sheet means the flatness of the steel sheet, which is called so-called ear elongation or belly elongation, and is caused by a difference in elongation in the longitudinal direction in the width direction of the steel sheet. That is, if the elongation in the longitudinal direction at the end in the width direction of the steel plate is large, the shape of the steel plate becomes an ear extension shape. On the other hand, if the elongation in the longitudinal direction at the central portion in the width direction of the steel plate is large, the shape of the steel plate becomes a belly stretch shape.
  • the degree of reduction is expressed by the reduction ratio R shown in the following formula (1) using the thicknesses Hin and Hout of the steel sheet on the entry side and the exit side of the rolling mill.
  • the degree of reduction is represented by the elongation ratio EL shown in the following formula (2). Therefore, in this specification, the degree of reduction in the temper rolling process is represented by the elongation ratio EL.
  • the shape of the steel sheet is corrected using shape control means such as a roll bender that controls the amount of bending of the rolling roll.
  • shape control means such as a roll bender that controls the amount of bending of the rolling roll.
  • the initial value of the operation amount of the shape control means is generally set to the center value of the operation range so that it can be adjusted according to the steel plate shape on the delivery side of the rolling mill during rolling.
  • the rolling reduction in the normal cold rolling process is several tens of percent, and the shape of the steel sheet before cold rolling, that is, the elongation difference in the longitudinal direction in the width direction of the steel sheet before cold rolling is a strain added in the cold rolling process. It is overwhelmingly small compared to the amount. For this reason, in a cold rolling process, the influence which the steel plate shape before rolling has on the steel plate shape after rolling is small.
  • the elongation rate in the temper rolling process is about 0.05 to 3%, and the elongation difference in the longitudinal direction in the width direction of the steel sheet before the temper rolling is about the same as the strain applied in the rolling process.
  • the shape of the steel plate before rolling has a great influence on the shape of the steel plate after rolling, and shape defects before rolling often remain after rolling. Therefore, it is necessary to consider the shape of the steel plate before rolling in the initial setting of the rolling mill.
  • Patent Document 1 discloses that the steel plate shape becomes the target shape by substituting the predicted value of the rolling load and the material crown and the actual measured value of the steel plate shape before rolling into a mathematical model created in advance.
  • a steel sheet shape control method in the cold rolling process for calculating the initial value of the operation amount of the shape control means has been proposed.
  • Patent Document 1 does not disclose or suggest a method for measuring an actual measurement value of a steel plate shape before rolling.
  • the actual measured value of the steel plate shape before rolling can be measured using a non-contact distance sensor on the exit side of the final stand of the hot rolling mill.
  • the steel plate shape changes due to creep deformation in the subsequent coil winding process and cooling process.
  • the steel plate shape on the exit side of the hot rolling mill may be different from the steel plate shape on the entry side of the cold rolling mill or temper rolling mill. Even if the measured values are used, it is difficult to control the steel plate shape to the target shape in the cold rolling process or the temper rolling process.
  • the steepness (an index indicating the steel plate shape as a peak height per pitch in the longitudinal direction) has a value at one location such as an ear extension shape with about 1.5%. Only the shape of the steel plate before rolling is handled. In general, since the shape of the steel sheet in the longitudinal direction is not constant, the steel sheet shape in the cold rolling process or the temper rolling process is the target of the steel sheet shape with only one representative value as in the embodiment described in Patent Document 1. It is insufficient to control the shape.
  • the operation amount of the shape control means reaches the upper limit value or the lower limit value of the operation range, The shape may not be sufficiently corrected.
  • a method of measuring the shape of the entire length of a steel sheet using a shape detection device by unwinding a hot-rolled coil before performing a cold rolling process or a temper rolling process can be considered.
  • a separate process of unwinding the coil is required, and thus a lot of labor is required.
  • Patent Document 1 Even if the shape of the entire length of the steel plate is measured, the technique described in Patent Document 1 is mainly intended for a cold rolling process in which the rolling reduction is determined in advance. For this reason, when it is a rolling process with a very small rolling reduction like a temper rolling process, the technique of patent document 1 may not be enough to correct the steel plate shape before rolling.
  • the present invention has been made in view of the above-mentioned problems, and its purpose is to accurately predict the steel plate shape before temper rolling without requiring much labor, and based on the predicted steel plate shape. It is providing the control apparatus and control method of a temper rolling mill which can correct
  • the control device for a temper rolling mill is a control device for a temper rolling mill for temper rolling a hot-rolled steel sheet, and includes a hot rolling step, a coil winding step, and coil cooling.
  • Predicting means for predicting the shape of the hot rolled steel sheet before temper rolling using a mathematical model simulating the process, and temper rolling based on the shape of the hot rolled steel sheet before temper rolling predicted by the predicting means
  • the elongation ratio calculating means for calculating the target elongation ratio of the hot-rolled steel sheet at the above, and the reduction position and tension of the temper rolling mill according to the target elongation ratio of the hot-rolled steel sheet in the temper rolling calculated by the elongation ratio calculation means And a control means for controlling.
  • the elongation rate calculating means is the maximum elongation in the shape of the hot-rolled steel sheet before temper rolling predicted by the predicting means.
  • the target elongation ratio EL of the hot-rolled steel sheet in the temper rolling is calculated by substituting the difference rate ⁇ max into the following formula (3).
  • (alpha) 1 in Numerical formula (3) shows a shape control safety factor.
  • the elongation rate calculating means is the maximum elongation in the shape of the hot-rolled steel sheet before temper rolling predicted by the predicting means.
  • the target elongation ratio EL of the hot-rolled steel sheet in the temper rolling is calculated by substituting the difference rate ⁇ max into the following formula (4).
  • (alpha) 2 in Numerical formula (4) shows a shape control safety factor.
  • a method for controlling a temper rolling mill is a method for controlling a temper rolling mill for temper rolling a hot-rolled steel sheet, and includes a hot rolling step, a coil winding step, and coil cooling.
  • An elongation ratio calculating step for calculating a target elongation ratio of the hot-rolled steel sheet in step, and a reduction position and tension of the temper rolling mill according to the target elongation ratio of the hot-rolled steel sheet in the temper rolling calculated in the elongation ratio calculation step
  • a control step for controlling is a method for controlling a temper rolling mill for temper rolling a hot-rolled steel sheet, and includes a hot rolling step, a coil winding step, and coil cooling.
  • the temper rolling mill control device is a temper rolling mill control device for temper rolling a hot-rolled steel sheet, and includes a hot rolling step, a coil winding step, and coil cooling.
  • Predicting means for predicting the shape of the hot rolled steel sheet before temper rolling using a mathematical model simulating the process, and hot rolled steel sheet based on the shape of the hot rolled steel sheet before temper rolling predicted by the predicting means
  • Control means for controlling the initial setting value of the shape control means for correcting the shape of the above.
  • the control device for a temper rolling mill according to the second aspect of the present invention is characterized in that, in the above invention, the shape control means is a roll bender for controlling a deflection amount of the rolling roll.
  • the temper rolling mill control method is a temper rolling mill control method for temper rolling a hot-rolled steel sheet, and includes a hot rolling step, a coil winding step, and coil cooling. Prediction step of predicting the shape of the hot-rolled steel plate before temper rolling using a mathematical model simulating the process, and hot-rolled steel plate based on the shape of the hot-rolled steel plate before temper rolling predicted in the prediction step And a control step for controlling an initial setting value of the shape control means for correcting the shape of the shape.
  • the steel plate shape before temper rolling is accurately predicted without requiring much labor, and the steel plate shape is desired based on the predicted steel plate shape.
  • the shape can be corrected.
  • FIG. 1 is a schematic diagram showing the configuration of a temper rolling mill control apparatus and a temper rolling mill to which the control apparatus is applied according to the first embodiment of the present invention.
  • FIG. 2 is a flowchart showing the flow of the temper rolling control process according to the first embodiment of the present invention.
  • FIG. 3 is a schematic diagram for explaining the flow of a general hot rolling process.
  • FIG. 4 is a diagram illustrating an example of calculating the elongation difference rate.
  • FIG. 5 is a diagram showing measured values of the shape of the steel sheet after the temper rolling of the invention example and the comparative example.
  • FIG. 6 is a schematic diagram showing a configuration of a temper rolling mill control apparatus and a temper rolling mill to which the control apparatus is applied according to the second embodiment of the present invention.
  • FIG. 1 is a schematic diagram showing the configuration of a temper rolling mill control apparatus and a temper rolling mill to which the control apparatus is applied according to the first embodiment of the present invention.
  • FIG. 2 is a flowchart showing the flow
  • FIG. 7 is a flowchart showing the flow of the temper rolling control process according to the second embodiment of the present invention.
  • FIG. 8 is a diagram showing the relationship between the operation amount of the work roll bender and the elongation difference rate.
  • FIG. 9 is a diagram showing measured values of the shape of the steel sheet after temper rolling in the invention example and the comparative example.
  • FIG. 1 is a schematic diagram showing the configuration of a temper rolling mill control apparatus according to a first embodiment of the present invention and a temper rolling mill to which the control apparatus is applied.
  • a temper rolling mill 1 to which a control device for a temper rolling mill according to a first embodiment of the present invention is applied includes a four-high rolling mill 2 and reels 3a and 3b as main components.
  • the temper rolling machine 1 passes the steel sheet S through the four-high rolling mill 2 while discharging and winding the hot-rolled steel sheet (hereinafter abbreviated as steel sheet) S using the reel 3a and the reel 3b. As a result, the shape of the steel sheet S is corrected.
  • the reduction control of the steel sheet S is performed by controlling the reduction position of the work roll of the four-high rolling mill 2, and the rolling tension of the steel sheet S is controlled by the torque control of the motor that rotates the reels 3a and 3b.
  • the four-high rolling mill 2 includes a work roll bender that controls the shape of the steel sheet S by controlling the amount of axial deflection of the work roll as the shape control means of the steel sheet S.
  • a control device 10 for a temper rolling mill is configured by an information processing device such as a personal computer, and the arithmetic processing device in the information processing device stores a computer program. By executing this, it functions as a steel plate shape prediction unit 11, a target elongation rate setting unit 12, and a reduction position / tension control unit 13. The functions of these units will be described later.
  • the control device 10 of the temper rolling mill having such a configuration predicts the steel plate shape before temper rolling with high accuracy without requiring much labor by executing the temper rolling control process shown below,
  • the steel plate shape is corrected to a desired shape based on the predicted steel plate shape.
  • the operation of the control device 10 of the temper rolling mill when the temper rolling control process is executed will be described with reference to FIGS.
  • FIG. 2 is a flowchart showing the flow of the temper rolling control process according to the first embodiment of the present invention.
  • the flowchart shown in FIG. 2 starts at the timing when the execution command for the temper rolling process is input, and the temper rolling control process proceeds to step S1.
  • the steel plate shape prediction unit 11 acquires the steel plate information and hot rolling information of the steel plate S that performs temper rolling. Specifically, as shown in FIG. 3, in a general hot rolling process, the steel sheet S is rolled to a predetermined thickness in the finish rolling mill 21 and then passes through a run-out table (not shown). Is cooled by the coiler 23 and wound in a coil shape by the coiler 23 (coil winding process). And the coil-shaped steel plate S is cooled until it becomes normal temperature in a coil yard (coil cooling process).
  • the steel plate shape prediction unit 11 acquires information on material characteristics such as the dimensional shape, temperature, and deformation resistance of the steel plate S on the exit side of the finish rolling mill 21 as steel plate information. Moreover, the steel plate shape prediction unit 11 acquires, as hot rolling information, information on the cooling condition of the steel plate S by the water cooling device 22 and the tension and speed applied to the steel plate S in the passing plate. In addition, when the temperature of the steel plate S can be measured before winding by the coiler 23, the measured temperature may be included in the steel plate information. Thereby, the process of step S1 is completed and a temper rolling control process progresses to the process of step S2.
  • the steel plate shape prediction unit 11 simulates the hot rolling process, the coil winding process, and the coil cooling process based on the steel sheet information and hot rolling information of the steel sheet S acquired in the process of step S1.
  • the shape of the steel plate S before temper rolling is predicted using a mathematical model (steel plate shape prediction process). Details of the steel plate shape prediction process will be described later.
  • the process of step S2 is completed and a temper rolling control process progresses to the process of step S3.
  • the target elongation rate setting unit 12 calculates the target elongation rate EL of the steel sheet S in the temper rolling based on the shape of the steel sheet S before the temper rolling predicted in the process of step S2. . Specifically, first, the target elongation rate setting unit 12 calculates the elongation difference rate ⁇ in the shape of the steel sheet S before temper rolling using the following formula (5).
  • Equation (5) le and lc represent the length of the steel sheet S at the center position in the width direction and the end position in the width direction of the steel sheet S, respectively.
  • the shape of the steel sheet S is an ear-extending shape, and when it is negative, the shape of the steel sheet S is an abdominal elongation shape.
  • FIG. 4 is a diagram showing a calculation example of the elongation difference rate.
  • This example shows the elongation difference obtained from the shape prediction result of a low carbon steel plate having a thickness of 2.0 mm and a width of 1200 mm.
  • the shape of the steel plate is an ear extension shape with an elongation difference rate of 0.1% from the front end in the longitudinal direction (longitudinal position 0 m) to the vicinity of the central portion in the longitudinal direction (longitudinal position 450 m).
  • the shape of the steel plate becomes a belly stretch shape (defective shape) with an elongation difference rate of about ⁇ 0.2%.
  • the elongation difference 0.1%
  • the steepness using the peak height per unit length of the steel sheet as an index is about 2%.
  • the portion having the worst shape in the steel plate shape before temper rolling that is, an elongation rate larger than the maximum value (maximum elongation difference rate) ⁇ max of the elongation difference rate ⁇ is set as the target elongation rate EL. .
  • the target elongation rate setting unit 12 calculates the target elongation rate EL of the steel sheet S in the temper rolling by substituting the calculated maximum elongation difference rate ⁇ max into the following formula (6).
  • ⁇ 1 in the following formula (6) represents a shape control safety factor considering an error of the formula model and an operation variation in the temper rolling process.
  • the target elongation rate setting unit 12 substitutes the maximum elongation difference ⁇ max in the shape of the steel sheet S before temper rolling predicted in the process of step S2 into the following equation (7).
  • the target elongation ratio EL of the steel sheet S in quality rolling may be calculated.
  • ⁇ 2 in the following formula (7) represents a shape control safety factor considering an error of the formula model and an operation variation in the temper rolling process.
  • the shape control safety factors ⁇ 1 and ⁇ 2 may be determined for each temper rolling mill according to the prediction accuracy of the mathematical model, the amount of fluctuation in the operation of the temper rolling mill, and the accuracy of the required steel plate shape.
  • the value of the control safety factor ⁇ 1 is preferably set within a range of 1.1 to 5.0, and the value of the shape control safety factor ⁇ 2 is preferably set within a range of 0.1 to 1.0.
  • the elongation rate in the temper rolling process is affected by mechanical properties such as yield strength and elongation of the steel sheet after temper rolling. For this reason, when the range of the stretch rate is limited due to the mechanical properties of the steel sheet, the target stretch rate EL is obtained in consideration of both the stretch rate constraint due to the mechanical properties and the stretch rate for shape correction. It is desirable. Thereby, the process of step S3 is completed and a temper rolling control process progresses to the process of step S4.
  • the rolling position / tension control unit 13 uses a theoretical rolling model to calculate the temper rolling mill based on the target elongation ratio EL of the steel sheet S in the temper rolling calculated in the process of step S3. 1, the rolling position of the four-high rolling mill 2 and the tension of the steel sheet S are controlled.
  • the reduction position / tension control unit 13 may control the reduction position and the tension by referring to a table indicating the relationship between the target elongation rate EL, the reduction position, and the tension for each steel type prepared in advance.
  • the initial value of the work roll bender's operation amount may be set to the center value of the operation range in preparation for the operation by the operator during temper rolling.
  • the actual value of the elongation rate is calculated from the measurement result of the thickness or the sheet passing speed of the steel sheet S before and after rolling, and the reduction position and the tension are set so that the target elongation rate can be maintained based on the calculated result. It is good to perform feedback control. Thereby, the process of step S4 is completed and a series of temper rolling control processes are complete
  • the mathematical model in each part is constituted by a phase transformation model, a heat transfer model, and a stress / strain model.
  • a viscoplastic analysis is performed using a differential model for the temperature calculation and a simple physical model for the stress / strain model (slit model on the runout table, lamination after winding). Cylindrical model). The outline of each model will be described below.
  • the temperature transition on the run-out table is the heat transfer analysis and transformation analysis with the condition of the steel sheet at the delivery side of the finishing mill (sheet crown, flatness, and temperature distribution in the width direction) as the initial condition and the cooling condition as the boundary condition. It is calculated by solving The temperature distribution of the C cross section of the steel sheet is obtained by solving the unsteady conduction equation shown in the following formula (8) and the boundary condition formula shown in the following formula (9) (explicit differential model).
  • the temperature distribution in the plate thickness direction is assumed to be uniform, and is treated as a one-dimensional model only in the plate width direction.
  • the phase transformation uses a method of calculating transformation behavior for an arbitrary cooling curve using an isothermal transformation curve (TTT diagram), and considers changes in physical property values due to transformation and transformation heat generation.
  • T is the temperature of the steel sheet
  • t is the time
  • ⁇ is the thermal conductivity
  • q is the calorific value per unit time associated with the phase transformation
  • ⁇ is the density
  • c is the specific heat
  • n is the coordinate perpendicular to the steel sheet surface
  • h Represents the heat transfer coefficient
  • Tc represents the temperature of the coolant or the atmosphere.
  • volume strain increment ⁇ t and creep strain increment ⁇ c between time t and time t + ⁇ t are given by the following equations (10) and (11).
  • ⁇ is a linear expansion coefficient
  • x is a transformation rate
  • ⁇ depends on temperature and transformation rate.
  • C 1 , C 2 and n are parameters representing creep deformation.
  • a slit model is used for stress / strain analysis on the run-out table.
  • the slit model it is assumed that elongation or contraction deformation in each slit is elastically constrained between adjacent slits, and the following mathematical formula is introduced by introducing a longitudinal average strain ( ⁇ m with a superscript bar). (13) is used to determine the longitudinal stress generated in each slit.
  • the average strain in the longitudinal direction is determined under the condition that the average stress obtained by integrating the longitudinal stress in each slit obtained from the following formula (13) in the plate width direction is equal to the run-out tension.
  • E Young's modulus
  • ⁇ e exceeds the yield stress ⁇ Y
  • ⁇ p is used with the steel plate as an elastic perfect plastic body.
  • the strip crown amount at C ri is i slits (plate thickness difference between the plate width central), R n is the radius of the contact surface, the epsilon theta represents the circumferential strain.
  • a slit model correction model that takes into account the plate crown and the coil surface shape is used for analysis of the tension distribution in the plate width direction in the coil winding process. Similar to the analysis on the run-out table, the longitudinal stress at this time is expressed by the following formula (16), and the longitudinal average strain (with superscript bar) is set so that the longitudinal average stress becomes equal to the coil tension. Of ⁇ m ) and the tension distribution is calculated. Further, the coil surface after N turns is obtained by a coupled analysis with a coil deformation obtained by a coil cooling analysis to be described later, with the coil winding tightening force based on the tension distribution obtained using the following formula (17) as an external force.
  • Equation (17) is solved by assuming that the contact thermal conductivity h c depends on the contact pressure p between the steel plates in contact, and the thermal conductivity in the radial direction is calculated using the following Equation (18). To do. Further, when the plate crown is large, a gap is formed between the steel plates in the vicinity of the end in the width direction of the steel plate. Therefore, the equivalent contact thermal conductivity is calculated using Equation (19) in consideration of the thermal conductivity of the air in the gap. The equivalent thermal conductivity ⁇ r_eq in the radial direction is obtained using h c_eq , Equation (20).
  • lambda w is the thermal conductivity of the plate width direction
  • d represents the size of the gap between the steel plates.
  • the laminated cylindrical model is used for the analysis in the coil state. Unlike the case where the coil is analyzed as an integrated object, the laminated cylindrical model calculates the contact between the steel plates of the coil and considers contact / non-contact between the steel plates. Therefore, accurate stress / strain analysis can be performed. Specifically, when the contact force p acts on the steel plate, the radial stress and the circumferential stress acting on a certain steel plate j are given to the analysis by the following formula (21).
  • r represents the position in the radial direction in the steel sheet
  • R j represents the inner diameter
  • R j + 1 represents the outer diameter
  • the frictional force acting in the plate width direction of the contact surface is obtained using the following formula (22) to give a constraint in the plate width direction.
  • ⁇ is a friction coefficient
  • dj is a sign representing the direction of slip in the width direction.
  • the circumferential strain generated in each steel sheet is obtained by the following formula (23). It is done.
  • ⁇ represents the Poisson's ratio
  • equation (24) obtained by transforming equation (23) into an incremental form can be used to calculate under the matching condition that the circumferential strain increment of each steel plate at the contact surface becomes equal.
  • ⁇ E represents an increase in Young's modulus
  • the elastic deformation of the mandrel due to the tightening force is calculated in consideration of the contact between the innermost steel plate and the mandrel.
  • rigidity is set to zero in order to simulate coil extraction from a mandrel.
  • the heat transfer model and the phase transformation model are coupled and solved at each time step to obtain various physical property values at time t + ⁇ t.
  • a contact condition formula is established and the contact force is calculated, and the contact condition is recalculated assuming that the portion where the contact force is tensile is non-contact.
  • the calculation is repeated until all contact forces become compressive force or 0 (non-contact), and the stress / strain state at time t + ⁇ t is determined.
  • the analysis is continued until the temperature of the coil reaches about room temperature, and the final stress / strain state is evaluated.
  • the temper rolling mill includes a four-stage rolling mill including a work roll having a diameter of 500 mm and a barrel length of 1600 mm and a backup roll having a diameter of 1000 mm and a barrel length of 1600 mm, and the operation range of the work roll bender is ink. It was 0 to 60 ton / chock on the lease side (direction in which pressure was applied between the chock supporting the upper and lower work roll ends).
  • the steel plate S is a low carbon steel plate having a thickness of 2.0 mm and a width of 1200 mm, which was rolled in the hot rolling process shown in FIG. 3 and wound into a coil shape, and then cooled to room temperature. .
  • the predicted steel plate shape was as shown in FIG. That is, the absolute value of the maximum elongation difference ⁇ max was 0.2%.
  • the shape as 1.5 the value of the safety factor [alpha] 1 was calculated target expansion rate EL from the maximum elongation difference ratio [Delta] [epsilon] max using Equation (6), the target expansion ratio EL is 0.3% Met.
  • the rolling position is 1.85 mm
  • the entry side tension is 2.0 ton
  • the exit side tension Set to 4.5 tons.
  • the initial value of the operation amount of the work roll bender was set to 30 ton / chock, which is the center value of the operation range.
  • the rolling position and tension of a temper rolling mill for obtaining a target elongation rate of 0.1% were set using a rolling theory model formula.
  • the reduction position was controlled in the same manner as in Invention Examples 1 and 2. It shows in FIG. 5 after temper rolling.
  • the operator appropriately operated the work roll bender according to the shape of the steel plate on the exit side of the rolling mill.
  • the steel plate shape prediction unit 11 includes a hot rolling process, a coil winding process, and a coil cooling process. Is used to predict the shape of the steel sheet S before temper rolling, and the target elongation rate setting unit 12 performs the temper rolling in the temper rolling based on the predicted shape of the steel sheet S before temper rolling.
  • the target elongation rate EL of the steel sheet S is calculated, and the reduction position / tension control unit 13 controls the reduction position and tension of the work roll of the four-high rolling mill 2 according to the target elongation rate EL calculated by the target elongation rate setting unit 12. To do.
  • the steel plate shape before temper rolling can be accurately predicted without requiring much labor, and the steel plate shape can be corrected to a desired shape based on the predicted steel plate shape.
  • FIG. 6 shows the configuration of the temper rolling mill to which the control device for the temper rolling mill according to the second embodiment of the present invention is applied. Since it is the same as the structure of the temper rolling mill shown in 1, the description is abbreviate
  • FIG. 6 is a schematic diagram showing a configuration of a temper rolling mill control apparatus and a temper rolling mill to which the control apparatus is applied according to the second embodiment of the present invention.
  • the control device 30 of the temper rolling mill according to the second embodiment of the present invention is configured by an information processing device such as a personal computer, and the arithmetic processing device in the information processing device stores a computer program. By executing, it functions as the steel plate shape prediction unit 31, the operation amount setting unit 32, and the steel plate shape control unit 33. The functions of these units will be described later.
  • the control device 30 of the temper rolling mill having such a configuration predicts the steel plate shape before the temper rolling with high accuracy without requiring much labor by executing the temper rolling control process shown below.
  • the steel plate shape is corrected to a desired shape based on the predicted steel plate shape.
  • operation movement of the control apparatus 30 of the temper rolling mill at the time of performing a temper rolling control process is demonstrated.
  • FIG. 7 is a flowchart showing the flow of the temper rolling control process according to the second embodiment of the present invention.
  • the flowchart shown in FIG. 7 starts at the timing when the execution command for the temper rolling process is input, and the temper rolling control process proceeds to the process of step S11.
  • the steel plate shape prediction unit 31 acquires the steel plate information and hot rolling information of the steel plate S that performs temper rolling. Specifically, the steel plate shape prediction unit 31 acquires information on material characteristics such as the dimensional shape, temperature, and deformation resistance of the steel plate S on the exit side of the finish rolling mill 21 shown in FIG. 3 as steel plate information. Moreover, the steel plate shape prediction unit 31 acquires, as hot rolling information, information on the cooling conditions of the steel plate S by the water cooling device 22 shown in FIG. 3 and the tension and speed applied to the steel plate S in the passing plate. In addition, when the temperature of the steel plate S can be measured before winding by the coiler 23 illustrated in FIG. 3, the measured temperature may be included in the steel plate information. Thereby, the process of step S11 is completed and a temper rolling control process progresses to the process of step S12.
  • the steel plate shape prediction unit 31 simulates the hot rolling process, the coil winding process, and the coil cooling process based on the steel sheet information and hot rolling information of the steel sheet S acquired in the process of step S11.
  • the shape of the steel plate S before temper rolling is predicted using a mathematical model (steel plate shape prediction process). Since the steel plate shape prediction process has the same contents as the steel plate shape prediction process in step S2, the detailed description thereof is omitted. Thereby, the process of step S12 is completed and a temper rolling control process progresses to the process of step S13.
  • the operation amount setting unit 32 sets the initial setting value of the work roll bender based on the shape of the steel sheet S before the temper rolling predicted in the process of step S12. Specifically, first, the operation amount setting unit 32 calculates the elongation difference rate ⁇ (see FIG. 4) in the shape of the steel sheet S before the temper rolling using the already described mathematical formula (3).
  • FIG. 8 is a diagram showing the relationship between the operation amount of the work roll bender and the elongation difference calculated experimentally using the temper rolling mill shown in FIG.
  • temper rolling was performed on a low carbon steel plate having a thickness of 2.0 mm and a width of 1200 mm.
  • the elongation difference rate decreases. This is because when the work roll bender's operating amount is increased, the axial center deflection of the upper and lower work rolls changes in the direction in which the gap at both ends widens, so that the steel plate shape changes from the ear extension shape to the belly extension shape.
  • the operation amount of the work roll is changed from the lower limit value 0 ton / chock of the operation range to the upper limit value 60 ton / of the operation range.
  • the differential elongation changes by about -0.3%.
  • the operation amount setting unit 32 can perform sufficient shape control even in the portion having the worst shape in the steel plate shape before temper rolling, that is, in the portion where the elongation difference rate ⁇ is maximized, in other words, The initial value of the work roll bender's operation amount is set so that the work roll bender's operation amount does not reach the upper limit value or the lower limit value of the operation range even in the portion where the elongation difference rate ⁇ is maximum. That is, in this embodiment, the operation amount setting unit 32 sets the initial value of the operation amount of the work roll bender in consideration of the shape of the entire length of the steel plate.
  • the steel plate shape shown in FIG. 4 has a belly stretch shape with an elongation difference of ⁇ 0.2% at a position of about 850 m in the longitudinal direction of the steel plate.
  • the initial value is set to 30 ton / chock, which is the center value of the operation range, according to the initial setting method of the operation amount of a general work roll bender, the belly at a position of about 850 m.
  • the operation amount of the work roll bender is adjusted to 0 ton / chock, which is the lower limit of the operation range, to correct the stretch shape, the steel plate shape change is only 0.15%, and the abdominal stretch shape remains. Resulting in.
  • the operation amount setting unit 32 sets the initial value of the operation amount of the work roll bender so that the operation amount of the work roll bender does not stick to the lower limit value of the operation range even for the stretched shape at a position of about 850 m. Is calculated and set. Specifically, the operation amount setting unit 32 calculates the center value SHAPE (Med) of the steel plate shape using the following formula (25), and the operation range of the work roll bender is calculated with respect to the center value of the steel plate shape. Set the initial value of the work roll vendor's operation amount so that the center value comes.
  • SHAPE Max
  • SHAPE Min
  • the maximum value SHAPE (Max) and the minimum value SHAPE (Min) of the steel plate shape before temper rolling are 0.1 and ⁇ 0.2, respectively. Med) is calculated as -0.05%. Therefore, the operation amount setting unit 32 sets 40 ton / chock corresponding to ⁇ 0.05% as an initial value of the operation amount of the work roll vendor based on the relationship shown in FIG.
  • the initial value of the work roll bender's operation amount can be reduced by 40 ton / chock even for the abdominal stretch shape at a position of about 850 m.
  • the steel plate shape can be improved until zero. Thereby, the process of step S13 is completed and a temper rolling control process progresses to the process of step S14.
  • the steel plate shape control unit 33 controls the reduction position of the four-high rolling mill 2 and the tension of the steel plate S in the temper rolling mill 1.
  • the steel plate shape control unit 33 controls the steel plate shape by controlling the operation amount of the work roll bender according to the operation of the operator. Thereby, the process of step S14 is completed and a series of temper rolling control processes are complete
  • the temper rolling mill includes a four-stage rolling mill including a work roll having a diameter of 500 mm and a barrel length of 1600 mm and a backup roll having a diameter of 1000 mm and a barrel length of 1600 mm, and the operation range of the work roll bender is ink. It was 0 to 60 ton / chock on the lease side (direction in which pressure was applied between the chock supporting the upper and lower work roll ends).
  • the steel plate S is a low carbon steel plate having a thickness of 2.0 mm and a width of 1200 mm, which was rolled in the hot rolling process shown in FIG. 3 and wound into a coil shape, and then cooled to room temperature. .
  • the predicted steel plate shape was as shown in FIG.
  • the steel plate shape is an ear extension shape with an elongation difference of 0.1%, and from the vicinity of the central portion of the steel plate in the longitudinal direction to the longitudinal tail end, The difference in elongation is about -0.2%, indicating a poor shape (belly stretched shape).
  • the center value SHAPE (Med) of the steel plate shape is calculated as -0.05% based on the steel plate shape shown in FIG. 4, and the work roll corresponding to the center value of the steel plate shape is calculated based on the relationship shown in FIG.
  • the operating amount of the vendor 40 ton / chock
  • the operation amount of the work roll bender was feedback controlled based on the steel plate shape measured on the delivery side of the rolling mill.
  • the center value (30 ton / chock) of the operation range of the work roll vendor was set as the initial value of the operation amount of the work roll vendor.
  • FIG. 9 is a diagram showing measured values of the steel sheet shape after temper rolling in the invention example and the comparative example.
  • the steel plate shape is good, whereas in the comparative example, the belly stretch shape remains at the tail end portion of the steel plate and deviates from the target range, resulting in a poor shape.
  • the steel plate shape prediction unit 31 includes a hot rolling process, a coil winding process, and The shape of the steel sheet S before the temper rolling is predicted using a mathematical model simulating the coil cooling process, and the shape of the steel sheet S before the temper rolling which the operation amount setting unit 32 predicts by the steel plate shape prediction unit 31 is predicted.
  • the initial setting value of the work roll bender that corrects the shape of the steel sheet S is controlled based on the above.
  • control of the temper rolling mill which can predict the steel plate shape before temper rolling with high precision without requiring much labor, and can correct the steel plate shape to a desired shape based on the predicted steel plate shape.
  • An apparatus and a control method can be provided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)

Abstract

La présente invention porte, selon un premier mode de réalisation, sur un dispositif de commande (10) pour une installation de revenu, dans lequel une unité de prédiction de forme de tôle d'acier (11) prédit la forme d'une tôle d'acier (S) avant dressage par laminage à froid à l'aide d'un modèle mathématique pour simuler un processus de laminage à chaud, un processus d'enroulement de bobine et un processus de refroidissement de bobine ; une unité de réglage de pourcentage d'allongement cible (12) calcule un pourcentage d'allongement cible (EL) pour la tôle d'acier (S) en dressage par laminage à froid sur la base de la forme prédite pour la tôle d'acier (S) avant dressage par laminage à froid ; et une unité de commande de force de traction/position de réduction (13) commande la force de traction et la position de réduction d'un cylindre de travail dans un laminoir (2) à quatre étages selon le pourcentage d'allongement cible (EL) calculé par l'unité de réglage de pourcentage d'allongement cible (12).
PCT/JP2015/072370 2014-09-01 2015-08-06 Dispositif de commande et procédé de commande pour installation de revenu WO2016035505A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2014-177056 2014-09-01
JP2014177066A JP5971293B2 (ja) 2014-09-01 2014-09-01 調質圧延機の制御装置及び制御方法
JP2014177056A JP5971292B2 (ja) 2014-09-01 2014-09-01 調質圧延機の制御装置及び制御方法
JP2014-177066 2014-09-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107520256A (zh) * 2017-09-12 2017-12-29 首钢集团有限公司 一种平整机启停车过程中平整延伸率的控制方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6213209A (ja) * 1985-07-09 1987-01-22 Mitsubishi Electric Corp 伸び率制御装置
JPH11254017A (ja) * 1998-03-11 1999-09-21 Kawasaki Steel Corp 調質圧延機の油圧圧下制御方法及び装置
JP2013123726A (ja) * 2011-12-14 2013-06-24 Jfe Steel Corp 鋼帯の調質圧延の圧延荷重推定方法および装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6213209A (ja) * 1985-07-09 1987-01-22 Mitsubishi Electric Corp 伸び率制御装置
JPH11254017A (ja) * 1998-03-11 1999-09-21 Kawasaki Steel Corp 調質圧延機の油圧圧下制御方法及び装置
JP2013123726A (ja) * 2011-12-14 2013-06-24 Jfe Steel Corp 鋼帯の調質圧延の圧延荷重推定方法および装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107520256A (zh) * 2017-09-12 2017-12-29 首钢集团有限公司 一种平整机启停车过程中平整延伸率的控制方法
CN107520256B (zh) * 2017-09-12 2019-07-02 首钢集团有限公司 一种平整机启停车过程中平整延伸率的控制方法

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