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WO1999031949A2 - Procede et dispositif de revetement d'une bande metallique - Google Patents

Procede et dispositif de revetement d'une bande metallique Download PDF

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Publication number
WO1999031949A2
WO1999031949A2 PCT/DE1998/003599 DE9803599W WO9931949A2 WO 1999031949 A2 WO1999031949 A2 WO 1999031949A2 DE 9803599 W DE9803599 W DE 9803599W WO 9931949 A2 WO9931949 A2 WO 9931949A2
Authority
WO
WIPO (PCT)
Prior art keywords
coating
metal
metal strip
layer thickness
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DE1998/003599
Other languages
German (de)
English (en)
Other versions
WO1999031949A3 (fr
Inventor
Wilfried Schlechter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to DE19881932T priority Critical patent/DE19881932D2/de
Publication of WO1999031949A2 publication Critical patent/WO1999031949A2/fr
Publication of WO1999031949A3 publication Critical patent/WO1999031949A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
    • G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
    • G05B13/0265—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric the criterion being a learning criterion
    • G05B13/027—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric the criterion being a learning criterion using neural networks only
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates

Definitions

  • the invention relates to a method and a device for coating a metal strip which runs through a bath with coating metal, in particular zinc, a part of the coating metal being blown away after leaving the bath with air which emerges from at least one nozzle.
  • EP 0 663 632 A1 discloses a regulation in which the layer thickness of the coating metal on the metal strip is dependent on the speed of the metal strip, the distance between the nozzle and the bath through which the metal strip runs, and the distance between the nozzle and the metal band and depending on the angle of attack of the nozzle with respect to the metal band.
  • a model of the coating process is used, which is adapted to the actual conditions in the coating process. A particularly precise coating can be achieved in this way.
  • the object is achieved according to the invention by a method according to claim 1 or a device according to claim 14.
  • the metal strip which runs through a bath with coating metal, is exposed to an air stream that emerges from a nozzle. Part of the coating metal that has deposited on the metal strip is removed by the air stream after leaving the bath with coating metal. blow.
  • the layer thickness of the coating metal on the metal strip is regulated by means of a coating model as a function of the distance between the metal strip and the nozzle, the distance between the metal strip and the nozzle being determined by means of an inverse coating model. In this way, more precise layer thicknesses can be achieved.
  • the method according to the invention and the device according to the invention are used particularly advantageously in connection with the formation of the coating model and the inverse coating model based on a neural network according to EP 0 663 632 AI.
  • the layer thickness of the coating metal on the metal strip is regulated as a function of target values for the layer thickness of the coating metal on the metal strip.
  • the layer thickness of the coating metal on the metal strip is regulated as a function of target values for the layer thickness of the coating metal on the metal strip, the target values of the layer thickness of the coating metal on the metal strip being based on actual values of the layer thickness of the coating metal measured by a so-called cold measurement the metal band are corrected.
  • the distance between the metal strip and the nozzle is determined by means of the inverse coating model depending on a measured value of the pressure at which the air exits the nozzle or an equivalent pressure measured value.
  • the distance between the metal strip and the nozzle is made dependent on a measured value by means of the inverse coating model the layer thickness of the coating metal determined on the metal strip.
  • the layer thickness of the coating metal on the metal strip is measured shortly behind the nozzle in the direction of movement of the metal strip or in the region of the nozzle.
  • the measurement of the layer thickness of the coating metal on the metal strip is carried out as a so-called hot measurement.
  • the layer thickness of the coating metal on the metal strip is measured on both sides of the metal strip.
  • a setpoint value of the pressure at which the air exits the nozzle or an equivalent pressure value is determined by means of the coating model.
  • the coating model and / or the inverse coating model are adapted on-line.
  • the coating model and the inverse coating model are adapted on-line with actual values of the layer thickness of the coating metal measured by means of a cold measurement on the metal strip.
  • part of the coating metal becomes after leaving the bath blown away from both sides of the metal strip with air that emerges from at least two opposite nozzles, and the distance between the metal strip and the nozzle determined by means of the inverse coating model is corrected by means of the distance between the opposite nozzles.
  • FIG. 1 shows a schematic illustration of part of a coating system
  • FIG. 2 shows the interaction of the coating model and the inverse coating model in an exemplary embodiment
  • FIG. 3 shows an exemplary embodiment of a coating system using the method according to the invention.
  • FIG. 1 shows a schematic illustration of a coating system, for example a hot-dip galvanizing system.
  • a coating system for example a hot-dip galvanizing system.
  • the metal strip 5 to be coated emerges from a trunk 22 and passes through a bath 11 with liquid coating metal at the speed v.
  • a steel strip is particularly suitable as a steel strip and zinc as a coating metal.
  • After exiting the bath 11 with coating metal a still liquid layer of coating metal adheres to the metal strip 5.
  • nozzles 6 and 10 are arranged, from which air flows against the metal strip 5. Excess coating metal is removed from the metal strip 5 due to the air flow that emerges from the nozzles 6 and 10 and strikes the metal strip 5.
  • the airflow is more advantageous wise laminar.
  • the air pressure of the air emerging from the nozzles 6 and 10 is adjusted via an actuator 13, here a valve, as a function of an actuating variable for the pressure, which is determined in a computing device 23.
  • the actuator 13 is arranged in an air line 7, into which air is blown by means of a blower 9.
  • the nozzle 6 is arranged at the other end of the air line 7.
  • a corresponding air supply is assigned to the nozzle 10, but is not shown.
  • the coating system also has deflection rollers 12, 24, 25, 26 and a stabilizing roller 14.
  • a hot measuring device 1 for measuring the layer thickness c H , o of the coating metal on the top of the metal strip 5, a hot measuring device 2 for measuring the layer thickness c H , u of the coating metal on the underside of the metal strip 5, a cold measuring device 3 for measuring the layer thickness c ⁇ , o of the coating metal on the metal strip 5 and a cold measuring device 4 for measuring the layer thickness Ck.u of the coating metal on the metal strip 5 are provided.
  • the hot measuring device 1 and 2 and the cold measuring device 3 and 4 are connected in terms of data technology to the computing device 23.
  • a compressed air measuring device 28 is provided, by means of which the pressure p u in the compressed air line 7 is measured.
  • the compressed air measuring device 28 is connected to the computing device 23.
  • a pressure measuring device can also be provided in the nozzles 6 and 10.
  • the measured values of the layer thicknesses CH.L, C H .O, C K , U CK.O pressure measured values p u and information about the belt speed v are fed to the computing device.
  • the computing device 23 can additionally provide the height h of the nozzles 6 and 10 above the bath 11 with coating metal and to supply an angle of attack ⁇ of the nozzles 6 and 10.
  • these values can also be stored in the computing device 23.
  • the angle of attack ⁇ is not shown for reasons of simplicity m FIG 1.
  • the definition of the angle of attack ⁇ can be found in FIG. 1 of EP 0 663 632 AI.
  • FIG 2 shows an exemplary embodiment for the functional interaction of a coating system according to the invention.
  • Reference numeral 32 denotes the coating process, which includes the metal strip 5, the bath 11 with coating metal, the nozzles 6 and 10, the hot measuring devices 1 and 2, the pressure measuring device 28, the actuator 13, the compressed air line 7, the blower 9 and one on the computing device 23 n
  • FIG 1 implemented pressure controller, which controls the actuator 13 depending on a predetermined target pressure p * and the measured pressure p u , and optionally includes the cold measuring devices 3 and 4 of FIG 1.
  • Numeral 30 denotes a coating model and numeral 31 denotes a reverse coating model. The coating models 30 and 31 are implemented on the computing device 23 in FIG. 1.
  • the coating model 30 determines a target pressure p * for the pressure in the compressed air line 7 m FIG. 1 m as a function of a target value c * for the layer thickness of the coating metal on the metal strip, as a function of the strip speed v, and of the distance a between the nozzle and the strip.
  • the distance a between the nozzle and the belt is determined by the inverse coating model 31 as a function of the belt speed v, m as a function of the pressure p in the pressure air line 7 or ner equivalent size (such as the air pressure in the nozzle 6 in FIG 1) and the layer thickness c H , which is measured with the hot measuring device 2 in FIG 1, determined. If, at the start of the coating process 32, there is still no distance a between the nozzle and the metal strip determined by the inverse coating model 31, half of the distance between two nozzles is initially used instead.
  • the inverse coating model 31 is a partially inverse model of the coating model 30.
  • the coating model and / or the inverse coating model are retrained online. It is particularly advantageous to retrain both models, the coating model 30 and the inverse coating model 31. This training of the coating model 30 and the inverse coating model 31 is carried out in more detail in FIG. 4 using an example.
  • FIG. 3 The interaction of the individual measuring devices and actuators of a coating system, as shown in FIG. 1, and the coating model 30 described in FIG. 2 and the inverse coating model 31 are illustrated in FIG. 3 with reference to the top of the metal strip 5.
  • the individual sizes are correspondingly indicated by the Index "o" marked. Further additional advantageous embodiments of the invention are explained.
  • reference numeral 40 denotes a monitor, 41 a switch, 44 a normalization, 45 and 46 multipliers, 47 and 49 adders, 48 a divider and 51 a pressure regulator, dbar.d denotes the thickness of the metal strip 5 and a D o the distance between the nozzles 6 and 10.
  • This distance is advantageously set and output by a nozzle precontrol 50.
  • the distance a c between the nozzle 6 and the metal strip 5, which is from the inverse Coating model 31 is determined, to the distance a D D between the nozzle 6 of the nozzle 10 reduced by the band thickness d B nd.
  • the set layer thickness value c * is corrected in relation to the layer thickness c, o / as a function of the measured values supplied by the cold measuring device 4.
  • Such a corrected layer thickness setpoint for the exemplary embodiment 1 according to FIG. 3 is the input variable in the coating model 30.
  • the starting point is a basic model 52, which has a layer thickness c ⁇ dei ⁇ as a function of the speed v of the metal strip, as a function of the pressure p at which the air emerges from the nozzles 6 and 10 in FIGS. 1 and 3, or an equivalent size and as a function of it of the distance between nozzle 6 or 10 and metal strip 5.
  • the distance a between nozzle 6 or 10 and metal strip 5 is advantageously an average value of the distance or half the distance between the two nozzles 10 and 6.
  • the parameters kl, k2, k3, k4, k5, k6 and k7 of the basic model 52 designed as a structured neural network are determined by means of a learning algorithm 53 as a function of the difference between a measured value of the layer thickness c ⁇ and the value for determined by the basic model 52 the layer thickness c M ⁇ dei ⁇ of the coating metal on the metal strip 5 is determined.
  • the measured value of the layer thickness c ⁇ of coating metal 5 is the output variable of one of the two cold measuring devices 3 and 4 in FIG. 1.
  • the learning algorithm 53 changes or determines the parameters k4 and k5 as a function of the distance a between nozzle 6 and 10 and metal strip 5.
  • the learning algorithm determines or changes the parameters kl and k3 as a function of the pressure p in the nozzle 6 or 10.
  • the learning algorithm determines or changes the parameters kl and k7 depending on the speed v of the metal strip and the measured layer thickness c ⁇ of the coating metal on the metal strip 5.
  • the base model 52 is partially inverted for use as the coating model 30 or inverse coating model 31.
  • the use of a structured neural network is particularly advantageous.

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  • Engineering & Computer Science (AREA)
  • Artificial Intelligence (AREA)
  • Chemical & Material Sciences (AREA)
  • Evolutionary Computation (AREA)
  • General Physics & Mathematics (AREA)
  • Medical Informatics (AREA)
  • Software Systems (AREA)
  • Physics & Mathematics (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Automation & Control Theory (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)

Abstract

L'invention concerne un procédé et un dispositif permettant de revêtir une bande métallique (5) qui traverse un bain (11) contenant un métal de revêtement, notamment du zinc. En aval du bain (11), une partie du métal de revêtement est retirée avec de l'air sortant d'au moins une buse (6, 10). L'épaisseur de la couche de métal de revêtement appliquée sur la bande métallique (5) est réglée en fonction de la distance (a, ao, au) séparant la bande métallique (5) de la buse (6, 10) au moyen d'un modèle de revêtement (30), la distance entre la bande métallique (5) et la buse (6, 10) étant calculée à l'aide d'un modèle de revêtement inverse (31).
PCT/DE1998/003599 1997-12-19 1998-12-07 Procede et dispositif de revetement d'une bande metallique Ceased WO1999031949A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19881932T DE19881932D2 (de) 1997-12-19 1998-12-07 Verfahren und Einrichtung zum Beschichten eines Metallbandes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997156877 DE19756877A1 (de) 1997-12-19 1997-12-19 Verfahren und Einrichtung zum Beschichten eines Metallbandes
DE19756877.7 1997-12-19

Publications (2)

Publication Number Publication Date
WO1999031949A2 true WO1999031949A2 (fr) 1999-07-01
WO1999031949A3 WO1999031949A3 (fr) 1999-08-26

Family

ID=7852747

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1998/003599 Ceased WO1999031949A2 (fr) 1997-12-19 1998-12-07 Procede et dispositif de revetement d'une bande metallique

Country Status (2)

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DE (2) DE19756877A1 (fr)
WO (1) WO1999031949A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10059567A1 (de) * 2000-11-30 2002-06-13 Siemens Ag Verfahren und Vorrichtung zur Berechnung von Prozessgrößen eines industriellen Prozesses
FR2913432B1 (fr) * 2007-03-07 2011-06-17 Siemens Vai Metals Tech Sas Procede et installation de depot en continu d'un revetement sur un support en bande
KR102180828B1 (ko) 2018-09-21 2020-11-19 주식회사 포스코 도금량 제어 장치 및 도금량 제어 방법
EP3734220A1 (fr) * 2020-02-21 2020-11-04 Primetals Technologies Austria GmbH Installation de mesure d'épaisseur d'un revêtement de produit métallique en défilement

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1521406B2 (de) * 1963-05-22 1971-04-15 National Steel Corp , Pittsburgh, Pa (V St A ) Verfahren und vorrichtung zur steuerung der ueberzugs dicke des metallueberzugs eines metallischen bandes insbe sondere eines verzinkten stahlbandes
DE1796303B2 (de) * 1964-11-05 1974-08-01 National Steel Corp., Pittsburgh, Pa. (V.St.A.) Vorrichtung zur Steuerung der Überzugsdicke eines Metallüberzugs beim Überziehen eines Metallbands. Ausscheidung aus: 1521417
FR2678645B1 (fr) * 1991-07-01 1993-10-29 Sollac Procede de regulation d'un traitement metallurgique effectue sur un produit en defilement et dispositif pour sa mise en óoeuvre.
JPH06116696A (ja) * 1992-10-06 1994-04-26 Nippon Steel Corp 溶融めっき鋼板のめっき付着量制御装置
US5683514A (en) * 1992-12-15 1997-11-04 Weirton Steel Corporation Coating control apparatus
CA2139119C (fr) * 1993-04-28 2001-03-13 Kazunari Andachi Methode servant a regler le poids d'un materiau de couchage par induction au gaz
JP2900969B2 (ja) * 1993-05-31 1999-06-02 川崎製鉄株式会社 溶融めっきの付着量制御方法
ATE161109T1 (de) * 1994-01-17 1997-12-15 Siemens Ag Verfahren und vorrichtung zur führung eines prozesses

Also Published As

Publication number Publication date
DE19881932D2 (de) 2000-11-30
WO1999031949A3 (fr) 1999-08-26
DE19756877A1 (de) 1999-07-01

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