EP3031541B1 - Steuerungssystem für tandemwalzwerk und steuerungsverfahren für tandemwalzwerk - Google Patents

Steuerungssystem für tandemwalzwerk und steuerungsverfahren für tandemwalzwerk Download PDF

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Publication number
EP3031541B1
EP3031541B1 EP15196195.0A EP15196195A EP3031541B1 EP 3031541 B1 EP3031541 B1 EP 3031541B1 EP 15196195 A EP15196195 A EP 15196195A EP 3031541 B1 EP3031541 B1 EP 3031541B1
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European Patent Office
Prior art keywords
strip
roll position
rolling
roll
strip thickness
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EP15196195.0A
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English (en)
French (fr)
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EP3031541A1 (de
Inventor
Masahiro Kayama
Shigetoshi KURIHARA
Masayoshi Tachibana
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Hitachi Ltd
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Hitachi Ltd
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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
    • B21B37/58—Roll-force control; Roll-gap control
    • 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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • 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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge

Definitions

  • the present invention relates to a control system of a tandem rolling mill and control method of a tandem rolling mill and, more particularly, to a control system of a tandem rolling mill and control method of a tandem rolling mill which are suitable for stabilization of rolling and securing good quality of a strip by, upon calculating a roll position of work rolls of each stand for rolling the strip to a desired thickness prior to full-scale rolling of the strip, adjusting a calculated value of the roll position to an optimized value which allows a target strip thickness to be obtained.
  • a processing procedure is employed in which prior to rolling, the rolling condition of a concerned strip is predicted, a roll position (corresponding to a gap between upper and lower work rolls) and a roll speed are determined, a head end of the strip is controlled and, thereafter, the roll position and the roll speed are gradually corrected to proper values using a strip thickness and a strip tension which are obtained from a detector. Therefore, it is necessary to determine proper values for reference values for the roll position of each rolling stand and the roll speed by prediction calculation.
  • a head end thickness of the strip is accurately controlled to a target and, in order to stabilize rolling at the time when the head end of the strip is bit into each rolling stand of a finish mill, proper values for reference values for the roll position of the each rolling stand and the roll speed are determined by prediction calculation.
  • the most important aspect is the roll position for obtaining the target strip thickness at a delivery side of a final stand, and the roll position is required to be properly determined.
  • the roll position indicates a roll position of work rolls.
  • JP 2004042058 A relates to an intermediate plate thickness gauge that is arranged between a final rolling stand and a first stand in a continuous hot rolling equipment and a finishing plate thickness gauge that is arranged at the outlet side of the final rolling stand.
  • US 3186200 A relates to an automatic thickness regulator for strip rolling mills.
  • JP S61 129218 A discloses rolling down devices 9-12, rolling down control devices 23-26, sheet thickness control devices 27-30 and sheet thickness deviation detectors 35-38 are respectively disposed to rolling rolls 1-4 of the respective stands.
  • roll force of each stand is predicted from information about a target strip thickness and a chemical composition of a coil to be next rolled that is obtained from a host computer
  • a roll position of each stand is predicted using an inter-stand strip thickness calculation section predicting a strip thickness between stands and rolling results captured from a controlled object in addition to a control reference setup section calculating control references for a roll position and a roll speed
  • a roll position deviation calculation section calculating a deviation between the predicted roll position and an actual roll position
  • a strip thickness deviation calculation section calculating a deviation between a target strip thickness, at a finish mill delivery side that is fetched from the control reference setup section, and an actual strip thickness obtained as a rolling result
  • a roll position compensation amount calculation section calculating a roll position compensation amount from a roll position deviation and a strip thickness deviation
  • the control reference setup section is configured to calculate the roll position using the calculated roll position compensation amount.
  • the roll position compensation amount calculation section calculates a deviation between a calculation result obtained by assigned the rolling result to a roll position calculation formula, as a roll position prediction error.
  • a roll position prediction error By addition and subtraction of the roll position prediction error with respect to next roll position calculating result, a roll position of a few error can be calculated with respect to the next coil.
  • the strip thickness deviation calculation section calculates an error from a target strip thickness for a strip thickness at a finish mill final stand delivery side which is obtained as a result of the strip thickness control. When the strip thickness error is large, in next rolling, the roll position is compensated in the direction that the error is reduced, whereby a strip thickness error of the next coil can be reduced.
  • the control reference setup section compensates the roll position of each stand, that is calculated on the basis of a rolling theory, by the roll position compensation amount that is fetched from the roll position compensation amount calculation section, and calculates a final roll position reference, whereby strip thickness accuracy at the finish mill delivery side is enhanced.
  • Fig. 1 shows an embodiment of the present invention.
  • a control system of a tandem rolling mill is a control system of a hot strip tandem rolling mill. Operations of respective calculation sections of this embodiment and processing shown in flow charts can be executed specifically by a computer.
  • the control system 100 of the tandem rolling mill receives various signals from a control object 150 and outputs a control signal to the control object 150.
  • the control object 150 in this embodiment is a hot strip tandem rolling mill that is provided with a finish mill 160.
  • the finish mill 160 in the illustrated embodiment is composed of a plurality of rolling stands. In this embodiment, a configuration in which seven rolling stands 161 are continuously arranged is employed.
  • Fig. 1 shows an embodiment of the present invention.
  • FIG. 1 shows an example in a case where a control system of a tandem rolling mill is a control system of a hot strip tandem rolling mill. Operations of respective calculation sections of this embodiment and processing shown in flow charts can be executed specifically by a computer.
  • the control system 100 of the tandem rolling mill receives various signals from
  • a strip 163 is moved from the left to the right, and a roughing bar 165 whose thickness is approximately 30 mm is rolled by a roughing mill that is a previous station, whereby a thin strip 163 is produced.
  • the roughing bar 165 is called an incoming bar, a transfer bar, etc.
  • the finish mill 160 the roughing bar 165 is sequentially processed thin by rolling in the respective rolling stands 161 and finally discharged as a strip 163, having a thickness of approximately 1 mm to 15 mm, at a delivery side of F7 that is a final rolling stand.
  • work rolls 162 with which the respective rolling stands 161 are provided directly roll the roughing bar 165 and the strip 163.
  • a roll speed means a peripheral speed of the work roll 162.
  • a multi-gauge 164 that measures the thickness, width and temperature of the strip 163 is provided at the delivery side of the final rolling stand (F7) of the finish mill 160.
  • various detectors that includes a thermometer, a shapemeter measuring the flatness of the strip, a crop profile gauge measuring images of head and tail end shapes of the roughing bar 165, surface inspection equipment detecting a surface flaw of the strip 163, etc. are provided at respective sections as detectors for detecting states of the roughing bar 165 and strip 163, as needed.
  • the control system 100 of the tandem rolling mill includes a control reference setup section 101 that receives, from a host computer 50, information including a steel grade, a target strip thickness, a target width, etc. that are required for rolling of each strip to be rolled, and refers to a draft schedule memory section 102 and a speed pattern memory section 103 to calculate a roll force, a roll position of the work roll 162, a roll speed of the work roll 162, etc.
  • a result collection section 110 that collects a rolling result from the control object 150, a control reference value which the control system 100 of the rolling mill actually outputs to the control object
  • an inter-stand strip thickness calculation section 111 that predicts strip thicknesses among the stands (hereinafter referred to as inter-stand (strip) thicknesses) using data which the result collection section 110 collects
  • a roll position deviation calculation section 112 that calculates a deviation between an predicted value of the roll position, that is calculated using entry and delivery thicknesses predicted in the inter-stand strip thickness calculation section 111 and the roll force of each rolling stand 161 that is captured from the result collection section 110, and a roll position actual-value of each rolling stand 161 that is captured from the result collection section 110
  • a strip thickness deviation calculation section 113 that calculates an incremental difference between a target strip thickness of the F7 delivery, that is captured from the control reference setup section 101, and an actual strip thickness of the F7 delivery that is captured from the result collection section 110, and a roll position compensation amount calculation
  • the control reference setup section 101 receives information, including the steel grade, the target strip thickness, the target strip width, etc. that are required for rolling, from the host computer 50 and, thereafter, calculates a control reference including the roll position, the roll speed, etc. with respect to the strip to be rolled, from the information.
  • the head end of the strip 163 is rolled according to the control reference which the control reference setup section 101 outputs, so that in order to obtain a desired strip thickness from the head end, the roll force in each stand and the roll position of the work roll 162 are required to be suitable and, in order to stabilize behavior when the strip roll-bites into a downstream stand, the roll speed of each stand is required to be a reference that is balanced without any disturbance of a mass flow of the strip 163 (the product of the strip thickness and a strip speed).
  • a draft schedule that is information corresponding to how thin the roughing bar 165 and the strip 163 should be formed is captured from a corresponding item of the draft schedule memory section 102.
  • the draft schedule memory section 102 stores a difference in percent between the strip thicknesses of the entry and delivery relative to the entry strip thickness in rolling in each rolling stand 161. Respective draft schedules are classified by the steel grades, strip thicknesses and strip widths of strip to be rolled. The difference between the strip thicknesses of the entry and delivery relative to the entry strip thickness is called a draft. For example, a 35 mm roughing bar 165 whose steel grade is SS400, whose target strip thickness is 2.5 mm, and whose target strip width is 900 mm is considered.
  • FIG. 3 shows that the 35 mm roughing bar 165 is rolled by 14 mm corresponding to 40% on an F1 entry side to obtain an F1 delivery strip thickness of 21 mm.
  • an entry strip thickness of 21 mm that is rolled at a draft of 35% to obtain an F2 delivery strip thickness of 13.65 mm is shown.
  • a deviation which is produced between the F7 delivery strip thickness obtained in this way and the target strip thickness of 2.5 mm can be eliminated by compensating the draft of each stand according to the draft.
  • control reference setup section 101 searches a corresponding class portion of the draft schedule memory section 102 from the steel grade, strip thickness, and strip width of the strip to be next rolled that it receives from the host computer 50, and calculates the draft of each stand in order that the final stand (F7 in this embodiment) delivery strip thickness is also obtained.
  • a speed pattern is fetched from the speed pattern memory section 103, and the roll speed of each rolling stand is calculated in S2-2.
  • a configuration of the speed pattern memory section 103 is shown.
  • the control reference setup section 101 determines the steel grade, strip thickness and strip width of the strip 163 and extracts a corresponding speed pattern from the speed pattern memory section 103.
  • the strip thickness is 1.2 to 1.4 mm
  • the strip width is equal to or less than 1000 mm
  • an initial speed of 650 mpm, a first acceleration rate of 2 mpm/s, a second acceleration rate of 12 mpm/s, a regular speed of 1100 mpm, a deceleration rate of 6 mpm/s, and a final speed of 700 mpm are set.
  • the initial speed is a speed of the strip 163 at the time when the head end of the strip 163 is discharged from the final rolling stand 161 (F7)
  • the first acceleration rate is an acceleration rate at the time when the strip 163 subsequently increase its speed
  • the second acceleration rate is an acceleration rate during the strip speed reaches the regular speed after the strip 163 is roll-bit into a down coiler that is post-stage facility
  • the deceleration rate is a deceleration rate at the time when the strip reduces its speed to the final speed in order to stably passes through respective stands.
  • a rolling temperature of each stand is calculated in S2-3.
  • the temperatures of the roughing bar 165 and strip 163 are predicted by combining temperature prediction calculations in which a value, detected by a thermometer installed to each section of the control object 150, heat transfer by radiation, heat transfer, heat generation by plastic deformation of the strip due to rolling, roll conduction between rolls, etc. are taken into consideration.
  • Many temperature prediction methods are introduced in thermodynamics literature and, moreover, temperature change in rolling is described in detail in Chapter 6 (Temperature Change in Rolling) of "Theory and Practice of Strip Rolling” (Iron and Steel Institute of Japan ), for example, so that detailed explanation of them is omitted.
  • a deformation resistance that is a value corresponding to hardness of the strip to be rolled in each stand is calculated.
  • the forward slip is a value that corresponds to a ratio of the peripheral speed of the work roll to the delivery strip speed of the strip to be rolled in the work roll.
  • H an entry strip thickness
  • h a delivery strip thickness
  • R' is a deformed roll diameter
  • Kp is a deformation resistance
  • tb is an entry tension
  • tf is a delivery tension.
  • the details of the forward slip are described in " Theory and Practice of Strip Rolling" (Iron and Steel Institute of Japan ) and the like.
  • Vr i Vs i / f i , where Vr i is a roll speed of the i-th stand, and f i is a forward slip of the i-th stand.
  • the forward slip is calculated for each rolling stand and the roll speed of each rolling stand is found in S2-6.
  • the details of a roll force prediction formula are described in " Theory and Practice of Strip Rolling" (Iron and Steel Institute of Japan ) and the like and expressed as follows (Formula 5), for example.
  • the control reference setup section 101 outputs the roll position and the roll speed, which are calculated as described above, as control references with respect to a strip to be next rolled.
  • a roll position control section 130 performs roll position control in such a manner that the roll position of the work rolls 162 becomes a value as per the control reference, with respect to the control reference of the roll position that is outputted by the control reference setup section 101.
  • a speed control section 140 performs speed control in such a manner that the speed of the work rolls 162 becomes a value as per the control reference, with respect to the speed control reference outputted by the control reference setup section 101.
  • the control reference regarding to a coil to be next rolled is calculated by the control reference setup section 101 prior to rolling, whereas a series of arithmetic operations which are to be performed by the inter-stand strip thickness calculation section 111, the roll position deviation calculation section 112, the strip thickness deviation calculation section 113, and the roll position compensation amount calculation section 115 which are described hereinafter are performed at the time when the rolling is finished, using the rolling result of the rolled strip 163.
  • the rolling that is subjected to the operations is called “concerned rolling”
  • the strip 163 that is produced by the concerned rolling is called “concerned strip”.
  • inter-stand strip thickness calculation section 111 predicts delivery strip thicknesses t 1 to t 7 in F1 to F7 at the time when the strip 163 is rolled, on the basis of the rolling results. These strip thicknesses are hereinafter referred to as "inter-stand strip thicknesses". Moreover, when a detector that measures the strip thickness of the roughing bar 165 is not provided, estimation of a thickness to of the roughing bar 165 is also performed. In S5-1, the value t 7 of the strip thickness that is measured by the multi-gauge 164 on the delivery side of the final stand (F7) is fetched.
  • T 6 t 7 ⁇ V 7 ⁇ 1 + f 7 / V 6 x 1 + f 6 , where t 7 is a measured F7 delivery strip thickness, V 7 is a peripheral speed of an F7 work roll, f 7 is a forward slip of F7, V 6 is a peripheral speed of an F6 work roll, and f 6 is a forward slip of F6.
  • the forward slips f 6 and f 7 there is used the value which is calculated by the control reference setup section 101 using the value that is calculated by using [Formula 3] prior to rolling of the concerned strip.
  • the forward slip is calculated by estimation using the Formula, so that it is a value including a certain error.
  • On the inter-stand strip thickness predicted using this, an error is also superposed.
  • S5-3 to S5-8 the same processing as the processing using [Formula 7] is repeated, whereby the entry strip thickness is predicted in the order of F6, F5, F4, F3, F2, and F1. That is, an arithmetic operation in which the strip thickness on the stand entry side is found from each forward slip and the strip thickness on the stand delivery side is performed in order from the downstream rolling stand.
  • the delivery strip thicknesses in respective stands are found in order from the downstream rolling stand has been discussed in connection with this embodiment, they may be simultaneously found from a relationship among the delivery strip thickness in F7, the F7 forward slip, the forward slip of each stand, and the roll speed.
  • Fig. 6 processing procedures of the roll position deviation calculation section 112 are shown.
  • S6-1 the entry and delivery strip thicknesses in the concerned stand according to the concerned rolling are fetched from the inter-stand strip thickness calculation section 111.
  • S6-2 actual values of the roll force and the roll position which are related to the concerned stand with respect to the concerned strip are fetched from the result collection section 110, and the roll position is predicted by [Formula 6], using the actual result of the roll force.
  • the actual values of the roll force and roll position are generally captured at the same position of the head end of the concerned strip. For example, values after the strip is bit into each stand and approximately 2 to 3 mm of the strip is discharged may be collected as the actual results.
  • a roll position deviation (DsO_c)i that is a difference between the actual value of the roll position, that is captured in S6-2, and the roll position calculated in S6-2 is calculated according to [Formula 8].
  • DsO _ c i Dsa i ⁇ Dse i , where (Dsa)i is an actual roll position of i stand with respect to the concerned strip, and (Dse)i is a predicted roll position of i stand with respect to the concerned strip.
  • S6-4 whether processing for calculating the roll position deviation with respect to all stands is completed is determined and, unless they are finished, the processing in S6-1 to S6-3 is repeated. If the processing for calculating a roll position deviation value with respect to all stands is completed, the processing by the roll position deviation calculation section 112 is ended.
  • Fig. 7 processing procedures of the strip thickness deviation calculation section 113 are shown.
  • a target strip thickness is fetched from the control reference setup section 101.
  • the actual strip thickness that is measured by the multi-gauge 164 on the F7 delivery side is fetched from the result collection section 110.
  • a strip thickness deviation (hd)7 is calculated according to [Formula 9].
  • hd 7 htarget ⁇ ha 7, where (hd)7 is a strip thickness deviation on the F7 delivery side, (ha)7 is an actual strip thickness, and htarget is a target strip thickness.
  • the strip thickness deviation is calculated by the difference (hd)7 between the F7 delivery strip thickness detected by the multi-gauge 164 and the target strip thickness.
  • a processing procedure of the roll position compensation amount calculation section 115 is shown.
  • the strip thickness deviation is fetched from the strip thickness deviation calculation section 113.
  • the roll position deviation of the concerned stand is fetched from the roll position deviation calculation section 112.
  • a roll position compensation amount calculation gain is fetched from the roll position compensation amount calculation memory section 114.
  • a configuration of the roll position compensation amount calculation memory section 114 is shown.
  • the roll position compensation amount calculation memory section 114 is composed of a roll position deviation gain and a strip thickness deviation gain.
  • they are classified by the steel grade, the strip thickness, and the strip width.
  • Fig. 9 shows that if the steel grade is SS400, the strip thickness 2.0 to 3.0 mm, and the strip width is equal to or less than 1000 mm, 0.5 is stored as the roll position deviation gain and 0.45 is stored as the strip thickness deviation gain.
  • Fig. 9 shows that if the steel grade is SS400, the strip thickness 2.0 to 3.0 mm, and the strip width is equal to or less than 1000 mm, 0.5 is stored as the roll position deviation gain and 0.45 is stored as the strip thickness deviation gain.
  • Fig. 9 shows that if the steel grade is SS400, the strip thickness 2.0 to 3.0 mm, and the strip width is equal to or less than 1000 mm, 0.5 is stored as the roll position deviation gain and 0.45 is stored as the strip thickness
  • the value (Ds0_c)i of the roll position compensation amount that is memorized as the result of the latest rolling is fetched from the roll position compensation amount memory section 116.
  • Fig. 10 a configuration of the roll position compensation amount memory section 116 is shown.
  • the roll position compensation amount that is memorized in the roll position compensation amount memory section 116 is classified by the steel grade and the strip thickness, and the roll position compensation amount of the concerned class of each stand that has been outputted in response to the past rolling is memorized.
  • Values (Zp_p)i of the roll force compensation amounts regarding the respective stands (F1 to F7) are stored every classes. In Fig.
  • the roll position compensation amount (Ds0)i is calculated according to [Formula 10], using the values and the gain which are fetched in S8-1 to S8-4, and outputted to the control reference setup section 101.
  • Ds 0 i ⁇ ⁇ Ds 0 _ c i + 1 ⁇ ⁇ ⁇ Ds 0 _ p i + ⁇ ⁇ hd i , where ⁇ is the roll position deviation gain, ⁇ is the strip thickness deviation gain, and (Ds0_c)i is a roll position compensation amount of an ith stand that is fetched from the roll position compensation amount memory section 116.
  • ⁇ is a coefficient that determines a distribution ratio between the roll position compensation amount, based on the past rolling result stored in the roll position compensation amount memory section 116, and the roll position compensation amount calculated by the rolling result of the strip 163 that is subjected to immediate rolling, and takes the value of 0 to 1.
  • the roll position compensation amount that is calculated by the rolling result of the concerned strip 163 is ignored, and the roll positon compensation amount (Ds0)i of the concerned stand is determined by calculation using the roll position compensation amount based on the past rolling result that is stored in the roll position compensation amount memory section 116.
  • the roll positon compensation amount (Ds0)i is calculated using the rolling result of the strip 163 subjected to the immediate rolling, and the roll position compensation amount based on the past rolling result that is stored in the roll position compensation amount memory section 116 is ignored.
  • 0 ⁇ a ⁇ 1.0 they are proportionally divided by a ratio according, to ⁇ .
  • ⁇ is 0.5
  • the roll position compensation amount stored in the roll position compensation amount memory section 116 and the roll position compensation amount calculated by the immediate rolling result are proportionally divided by the same ratio.
  • ⁇ is a coefficient corresponding to consideration of the strip thickness deviation at the F7 delivery side to what extent and generally takes the value of 0 to 1.
  • ⁇ is 0, it is indicated that the roll position compensation amount (Ds0)i is calculated without consideration of the strip thickness deviation.
  • ⁇ is 1, it is indicated that the value corresponding to the strip thickness deviation is directly added to the roll position compensation amount (Ds0) of each stand.
  • the roll position compensation amount (Ds0)i that has been calculated is used in the control reference setup section 101 as follows. Though in S2-7 of Fig. 2 , the roll position is calculated according to the calculation [Formula 6], the calculation of the roll position after the roll position compensation amount is fetched from the roll position compensation calculation section 115 is performed as follows. That is, the roll position in which the target strip thickness is obtained at the F7 delivery side is set in each stand, so that a roll position set value (S)i is calculated by adding the roll position compensation amount (Ds0)i as indicated by [Formula 11].
  • the hot strip tandem rolling finishing mill is employed as the controlled object 150, and the control system of the hot strip tandem rolling mill is employed as the control system 100 of the tandem rolling mill.
  • the controlled object 150 may be a cold strip tandem rolling mill
  • the finish mill 160 is composed of seven rolling stands 161.
  • the tandem mill may be composed of four to six stands. Even in these cases, the present invention can be directly applied to.
  • the finish mill 160 may be composed of one stand or two stands, and the strip 163 may be produced by reciprocating rolling. Even in these cases, the present invention can be directly applied to by detecting or predicting the strip thicknesses on the entry side and the delivery side.
  • Fig. 11 illustrates a second embodiment of the present invention in which a function of making the distribution coefficient ⁇ , used in [Formula 11], variable according to similarity between strips which are rolled one after another is added.
  • a strip similarity calculation section 1102 fetches similarity numbers regarding the steel grade of the strip, that was subjected to the latest rolling, and the steel grade of the strip, that is next rolled, from a strip class memory section 1101, and outputs them to a distribution coefficient calculation section 1103.
  • the distribution coefficient calculation section 1103 calculates a proper value for the distribution coefficient ⁇ , based on the similarity, between the strips rolled one after another, which it receives from the strip similarity calculation section 1102, and outputs the proper value to the roll position compensation amount calculation section 115.
  • the roll position compensation amount calculation section 115 performs the calculation of [Formula 10] using ⁇ which it receives from the distribution coefficient calculation section 1103.
  • a processing procedure of the strip similarity calculation section 1102 is illustrated.
  • the strip similarity calculation section 1102 fetches the similarity number regarding the steel grade of the strip subjected to the latest rolling and the similarity number regarding the steel grade of the strip next rolled, from the strip class memory section 1101.
  • a configuration of the strip class memory section 1101 is illustrated.
  • the similarity numbers are defined correspondingly to the respective steel grades. This means that the closer the similarity numbers are, the further similar properties (deformation resistance and the like) of their steel grades are, and the further away the similarity numbers are, the properties of the steel grades are different.
  • the similarity of SS400 and the similarity of SS490 are 4 and 5, respectively, and they are different from each other in steel grade but they are steel grades having large similarity therebetween.
  • the similarity number of SPHC is 2 and the similarity between SS400 and SPHC is larger than the relation between SS400 and SS490.
  • the present invention can be effectively applied to the setup control of the tandem rolling mill.

Claims (7)

  1. Steuersystem (100) eines Tandem-Walzwerks, das ein Tandem-Walzwerk, das mit mehreren Walzgerüsten (161) versehen ist, als ein gesteuertes Objekt verwendet und eine Banddicke eines Bandes (163), das durch Arbeitswalzen (162), die in jedem der Walzgerüste (161) vorgesehen sind, kontinuierlich auf einen Sollwert gewalzt wird, steuert, wobei das Steuersystem (100) Folgendes umfasst:
    einen Walzenpositionsabweichungs-Berechnungsabschnitt (112), der eine Walzenposition der Arbeitswalzen (162), die in jedem Walzgerüst vorgesehen sind, unter Verwendung eines Ist-Walzwertes, der in jedem der mehreren Walzgerüste (161) erhalten wird, wenn das Band gewalzt wird, vorhersagt und eine Walzenpositionsabweichung der Arbeitswalzen (162) in jedem solchen Walzgerüst anhand der vorhergesagten Walzenposition und des Ist-Walzenpositionswerts der Arbeitswalzen (162) in jedem solchen Walzgerüst, der durch den Walzvorgang erhalten wird, berechnet;
    einen Banddickenabweichung-Berechnungsabschnitt (113), der eine Abweichung zwischen einer Soll-Banddicke und einer Banddicke des Bandes, die durch einen Banddicken-Messabschnitt detektiert wird, der an einer Ausgabeseite des Walzgerüsts in einer letzten Stufe des Tandem-Walzwerks vorgesehen ist, berechnet;
    einen Walzenpositionskompensationsbetrag-Berechnungsabschnitt (115), der einen Walzenpositionskompensationsbetrag in jedem Walzgerüst anhand jeder Walzenpositionsabweichung, die in dem Walzenpositionskompensationsbetrag-Berechnungsabschnitt (115) berechnet wird, und der Banddicke des Bandes, die in dem Banddickenabweichungs-Berechnungsabschnitt (113) berechnet wird, berechnet; und
    einen Steuerreferenz-Einrichtabschnitt, der Walzenpositionen der Arbeitswalzen (162) in jedem solchen Walzgerüst in Bezug auf ein als nächstes zu walzendes Band berechnet, die berechneten Walzenpositionen mit Walzenpositionskompensationsbeträgen kompensiert und Walzenpositionen, die in jedem Walzgerüst eingestellt werden sollen, berechnet.
  2. Steuersystem (100) des Tandem-Walzwerks nach Anspruch 1, das ferner einen Walzenpositionskompensationsbetrag-Berechnungsverstärkungs-Speicherabschnitt (114) umfasst, der entsprechend einer Stahlsorte und/oder einer Soll-Banddicke und/oder einer Soll-Bandbreite eine Walzenpositionsabweichungsverstärkung, die eine Konstante gleich oder größer als O oder gleich oder kleiner als 1 ist und die Signifikanz der Walzenpositionsabweichungen angibt, und eine Banddickenabweichungsverstärkung, die eine Konstante gleich oder größer als O oder gleich oder kleiner als 1 ist und die Signifikanz der Banddickenabweichungen des Bandes angibt, speichert; wobei
    der Walzenpositionskompensationsbetrag-Berechnungsabschnitt (115) von dem Walzenpositionskompensationsbetrag-Berechnungsabschnitt (115) die Walzenpositionsabweichungsverstärkung und die Banddickenabweichungsverstärkung, die der Stahlsorte, der Soll-Banddicke und der Soll-Bandbreite des gewalzten Bandes entsprechen, erhält und die Walzenpositionskompensationsbeträge durch Addieren eines Wertes, in dem die Walzenpositionsabweichung und die erhaltene Walzenpositionsabweichungsverstärkung multipliziert sind, und eines Wertes, in dem die Banddickenabweichung des Bandes und die erhaltene Banddickenabweichungsverstärkung multipliziert sind, berechnet.
  3. Steuersystem (100) des Tandem-Walzwerks nach Anspruch 1 oder 2, das ferner einen Walzenpositionskompensationsbetrag-Speicherabschnitt (116) umfasst, der den Walzenpositionskompensationsbetrag, der in früheren Walzergebnissen berechnet wurde, für jedes Walzgerüst entsprechend einer Stahlsorte, einer Solldicke und einer Sollbreite des Bandes speichert, wobei
    der Walzenpositionskompensationsbetrag-Berechnungsabschnitt (116) den Walzenpositionskompensationsbetrag, der an den Steuerreferenz-Einrichtabschnitt (101) ausgegeben werden soll, anhand der Walzenpositionsabweichung, die durch den Walzenpositionsabweichungs-Berechnungsabschnitt (112) berechnet wird, der Banddickenabweichung, die durch den Banddickenabweichungs-Berechnungsabschnitt (113) berechnet wird, und des Walzenpositionskompensationsbetrags, der in dem früheren Walzvorgang berechnet wird, berechnet.
  4. Steuersystem (100) des Tandem-Walzwerks nach wenigstens einem der Ansprüche 1-3, das ferner einen Abschnitt (111) zum Berechnen der Banddicke zwischen Gerüsten umfasst, um eine Banddicke zwischen Gerüsten, die eine Dicke auf einer Eintrittsseite jedes der mehreren Walzgerüste in Stromaufwärtsrichtung vor dem Walzgerüst der letzten Stufe des Tandem-Walzwerks ist, anhand der Banddicke, die durch die Banddickenlehre detektiert wird, die an der Ausgabeseite des Walzgerüsts bei der letzten Stufe des Tandem-Walzwerks vorgesehen ist, und einer Walzgeschwindigkeit, die eine Umfangsgeschwindigkeit der Arbeitswalze jedes der mehreren Walzgerüste ist, zu berechnen; wobei
    bei der Berechnung der Walzenposition der Arbeitswalze während des Walzens anhand der Walzergebnisse des gewalzten Bandes der Walzenpositionsabweichungs-Berechnungsabschnitt (112) die Walzenposition der Arbeitswalze jeder der mehreren Arbeitswalzen unter Verwendung der Banddicke zwischen Gerüsten, die durch den Abschnitt (111) zum Berechnen der Banddicke zwischen Gerüsten berechnet wird, vorhersagt.
  5. Steuersystem (100) des Tandem-Walzwerks nach wenigstens einem der Ansprüche 1-4, das ferner einen Ähnlichkeitszahl-Speicherabschnitt umfasst, der eine Ähnlichkeitszahl speichert, die ähnliche Werte entsprechend einem Grad der Ähnlichkeit einer Eigenschaft des Bandes entsprechend einer Stahlsorte des Bandes annehmen;
    einen Bandähnlichkeits-Berechnungsabschnitt (1102), der eine Ähnlichkeitszahl des gewalzten Bandes und eine Ähnlichkeitszahl eines als nächstes zu walzenden Bandes von dem Ähnlichkeitszahl-Speicherabschnitt erhält und eine Differenz zwischen den zwei erhaltenen Ähnlichkeitszahlen als eine Ähnlichkeit berechnet; und
    einen Verteilungskoeffizient-Berechnungsabschnitt (1103), der einen Verteilungskoeffizienten, der eine Konstante gleich oder größer als O oder gleich oder kleiner als 1 ist, anhand der berechneten Ähnlichkeit berechnet; wobei
    der Walzenpositionskompensationsbetrag-Berechnungsabschnitt einen Walzenpositionskompensationsbetrag aus einem Wert, in dem der berechnete Walzenpositionskompensationsbetrag und der Walzenpositionskompensationsbetrag, der von dem Walzenpositionskompensationsbetrag-Speicherabschnitt (116) erhalten wird und in den früheren Walzvorgängen berechnet wurde, durch den berechneten Verteilungskoeffizienten dividiert werden und addiert werden, und aus der Banddickenabweichung, die durch den Banddickenabweichungs-Berechnungsabschnitt berechnet wird, berechnet.
  6. Steuersystem (100) des Tandem-Walzwerks nach Anspruch 5, wobei der Verteilungskoeffizient-Berechnungsabschnitt (1103) den Verteilungskoeffizienten in der Weise berechnet, dass der Verteilungskoeffizient umso größer wird, je kleiner die Ähnlichkeit ist, und der Verteilungskoeffizient umso kleiner wird, je größer die Ähnlichkeit ist.
  7. Steuerverfahren eines Tandem-Walzwerks, das Folgendes umfasst:
    einen Walzenpositionsabweichungs-Berechnungsschritt, in dem ein Computer, der ein Tandem-Walzwerk steuert, das ein Band (163) mit mehreren Walzgerüsten (161) kontinuierlich walzt, eine Walzenposition einer Arbeitswalze (162) jedes Walzgerüsts unter Verwendung eines Ist-Walzwertes, der in jedem der mehreren Walzgerüste (161) erhalten wird, wenn das Band gewalzt wird, vorhersagt und eine Walzenpositionsabweichung in jedem Walzgerüst anhand eines Ist-Walzwertes in jedem Walzgerüst, der während des Walzvorgangs erhalten wird, berechnet;
    einen Banddickenabweichungs-Berechnungsschritt, der eine Abweichung zwischen einer Soll-Banddicke des Bandes (163) und der Banddicke, die auf einer Ausgabeseite eines letzten Walzgerüsts des Tandem-Walzwerks gemessen wird, berechnet;
    einen Walzenpositionskompensationsbetrag-Berechnungsschritt, der einen Walzenpositionskompensationsbetrag in jedem Walzgerüst (161) aus der Walzenpositionsabweichung in jedem Walzgerüst, die in dem Walzenpositionsabweichungs-Berechnungsschritt berechnet wird, und der Banddickenabweichung, die in dem Banddickenabweichungs-Berechnungsschritt berechnet wird, berechnet; und
    einen Steuerreferenz-Einrichtschritt, der die Walzenposition der Arbeitswalze (162) in jedem solchen Walzgerüst (161) in Bezug auf ein als nächstes zu walzendes Band berechnet, die Walzenposition der Arbeitswalze (162) in jedem Walzgerüst (161), die berechnet wird, um den Walzenpositionskompensationsbetrag in jedem solchen Walzgerüst, der in dem Walzenpositionskompensationsbetrag-Berechnungsschritt berechnet wird, kompensiert und eine Walzenposition, die in jedem solchen Walzgerüst (161) eingestellt werden soll, unter Verwendung der kompensierten Walzenposition berechnet.
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