EP0924002A2 - Verfahren zur Überwachung eines Walzwerkes, insbesondere zur On-Line-Steuerung des Walzprozesses in Sendzimir-Walzwerken - Google Patents

Verfahren zur Überwachung eines Walzwerkes, insbesondere zur On-Line-Steuerung des Walzprozesses in Sendzimir-Walzwerken Download PDF

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Publication number
EP0924002A2
EP0924002A2 EP98204277A EP98204277A EP0924002A2 EP 0924002 A2 EP0924002 A2 EP 0924002A2 EP 98204277 A EP98204277 A EP 98204277A EP 98204277 A EP98204277 A EP 98204277A EP 0924002 A2 EP0924002 A2 EP 0924002A2
Authority
EP
European Patent Office
Prior art keywords
rolling
mathematical model
mill
schedule
rolled
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.)
Granted
Application number
EP98204277A
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English (en)
French (fr)
Other versions
EP0924002B1 (de
EP0924002A3 (de
Inventor
Andrea De Felici
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.)
ABB Process Solutions and Services SpA
Original Assignee
ABB Sistemi Industriali SpA
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Application filed by ABB Sistemi Industriali SpA filed Critical ABB Sistemi Industriali SpA
Publication of EP0924002A2 publication Critical patent/EP0924002A2/de
Publication of EP0924002A3 publication Critical patent/EP0924002A3/de
Application granted granted Critical
Publication of EP0924002B1 publication Critical patent/EP0924002B1/de
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/147—Cluster mills, e.g. Sendzimir mills, Rohn mills, i.e. each work roll being supported by two rolls only arranged symmetrically with respect to the plane passing through the working rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/22—Pass schedule

Definitions

  • Rolling schedules that is to say, schedules which take into account the rolling parameters for the type of material, the final intended gauge, the type of mill used, any process tolerances et cetera, are currently prepared by manual input of these parameters by operators; the drawback of this method is that it requires the presence of specialized operators in addition to considerable time to prepare said schedules.
  • coils of material of the same type can be rolled differently by different operators, consequently not ensuring uniform production.
  • the mill is never utilized to full capacity as regards its operating speeds and the type of rolling that can be performed on the steel strips to be rolled.
  • an object of the present invention is to provide a method for supervising mills, particularly for Sendzimir-type mills, in which there is a program providing an interface between a high-level mill supervisor program and a mathematical model meant to prepare the rolling schedules.
  • Another object of the present invention is to provide a method for supervising mills, particularly for Sendzimir-type mills, which is highly reliable, relatively easy to provide and at competitive costs.
  • routines must allow users to request services to the mathematical model and in particular a rolling card and to configure and monitor the activity of the mathematical level.
  • routines must allow to collect and supply to the mathematical model all the parameters required for its operation and in particular:
  • the routines must furthermore activate the functions of the mathematical model at the appropriate time, according to the events that occur during the rolling process.
  • Two databases are described herein: one is a so-called real-time database, which consists of a memory area for the rapid exchange of information among the various processes.
  • the second database is a conventional database in which the data to be saved are stored.
  • man-machine interface means advantageously constituted for example by on-screen pages by means of which the operators can interact with the mathematical model.
  • the above mathematical model comprises four main functions: a function designated hereinafter as SETPRE hereinafter; a function designated as SETUP; a function designated as CYCLIC and a function designated as ADAPT.
  • This function therefore calculates the optimum number of rolling passes required, accordingly determining, for each pass, the gauge of the strip being rolled that must be reached and all the rolling parameters as preliminary values.
  • the CYCLIC function is instead meant to acquire, analyze and calculate the actual rolling conditions and the parameters in order to continuously monitor the status of the mill, provide short-term adaptation of the parameters related to the rollers of the mill (wear, roughness and temperature) and preprocess the information that will be used at the end of the rolling pass by the ADAPT function.
  • the ADAPT function is meant to adapt the parameters related to the materials, to the mill, to operating practice tables et cetera.
  • Activation is automatic at the end of each rolling pass.
  • routines shown in the figures then allow to retrieve the above cited functions of the mathematical model and to interface these functions with a higher-level mill supervision method in which the operator also intervenes.
  • the information related to the materials is of the static type (physical characteristics, for example) or of the dynamic type (deformation strain strength curves which are adapted by the mathematical model according to the information acquired during rolling);
  • Each routine generates messages of various kinds which allow to monitor the activity of the mathematical model; data containing the modifications made by the operator to the rolling schedule generated by the mathematical model: the mathematical model receives this information as input and calculates a new schedule, taking into account the changes introduced by the operator.
  • routines of figures 1 to 5 are now described in detail; said routines are executed as interface between the master mill supervision method and the mathematical model meant to generate the rolling schedule.
  • Activation can be manual by the operator, by means of a suitable button which can be selected by means of an on-screen page, or automatic, when a coil to be rolled is identified by means of a suitable bar code reader which reads the bar code applied to the coil to be rolled.
  • the preliminary schedule contains all the preset information for the mill for all the passes required to reduce the gauge of the material to its intended final value.
  • control is transferred to a step 2 during which the routine waits for the start command from the interface of the mathematical model or from the bar code reader;
  • the step 3 includes reading the code of the coil from the real-time database;
  • the step 4 provides for the retrieval of the material data related to the coil to be rolled from the permanent database;
  • the step 5 provides for the retrieval from the database of the information related to the characteristics of the coil to be rolled;
  • the step 6 provides for the retrieval from the database of the data related to the process constraints of the strip to be rolled, as a function of the type of strip;
  • the step 7 provides for the reading of information related to the current status of the mill, generated by the CYCLIC function, from the real-time database;
  • the step 8 provides for a reset of the data for the rolling schedule, of the information generated by a mathematical model during the execution of the various routines that compose the various functions, and of the modifications that the operator may have made to the schedule generated by the mathematical model;
  • the subsequent step 9 is a call to the SE
  • FIG. 2 illustrates the activation routine for the function of the mathematical model previously referenced by the name SETUP. This function is activated before each rolling pass begins and updates the rolling schedule processed earlier by the SETPRE function of the model for the coil currently being processed.
  • an initial step 14 is followed by a step 15 in which the routine waits for one second.
  • the subsequent step 16 is a checking step, during which a signal SYNC, which indicates an interaction between different processes (that is to say, one process can report to another process that a given situation has occurred, thus conditioning its execution), is checked.
  • the signal SYNC checks whether a signal for starting the first rolling pass or for ending the rolling pass has been received or whether a five-minute timer expiration signal has been received. If the result is negative, the routine returns to step 15, otherwise it moves on to a step 17 which checks whether the situation is the rolling pass end situation.
  • a subsequent step 23 retrieves from the database information related to the characteristics of the coil to be rolled or currently being rolled; material data, that is to say, data related to the characteristics of the steels rolled in the mill; and data related to constraints affecting the rolling mill as a function of the characteristics of the strip being rolled.
  • constraints relate for example to gauge reduction constraints, temperature constraints, speed constraints, tension constraints, roller roughness constraints and the like.
  • the next step 26 resets the reliability data, that is to say, the information of various kinds generated by the mathematical model during the executions of the various routines that compose the various functions.
  • the step 27 instead updates the information concerning the characteristics of the coil to be rolled or currently being rolled with the status of the actual process.
  • step 29 If the check of step 29 is positive, control is instead transferred from said step 29 to a step 32, which checks whether the transfer of the schedule update to the lower level is enabled. If the result is positive, control is transferred to a step 33, which sends the updated schedule to the lower automation level of the mill, and then control is transferred to a step 34, in which the data generated by the SETUP function, that is to say, data for the rolling schedule, are written to the real-time database.
  • routine of figure 3 begins with the startup step 37, which is followed by a step 38, which resets the data related to the current status of the mill and the data exchanged between the CYCLIC and ADAPT functions of the mathematical model on the real-time database.
  • control is transferred from step 46 to a step 47, during which the data related to the current status of the mill, the data related to the configuration of the mill and the data related to the exchange between the CYCLIC and ADAPT functions are written to the real-time database.
  • step 55 the routine moves on to a step 56, during which process data are written to the real-time database, and then on to a step 57, during which the code of the coil being rolled is read from the real-time database.
  • step 58 checks whether the coil being rolled has changed. If the result is positive, the routine moves on to step 59, which retrieves from the database the information related to the characteristics of the coil that is to be rolled or is currently being rolled.
  • step 60 This is followed by a step 60, during which these characteristics are written to the real-time database, and by a step 61, during which a series of tables is retrieved from the database; said tables, according to the characteristics of the rolled strip, provide the mathematical model with information regarding the constraints which the rolling mill must comply with.
  • the next step 65 reads from the real-time database the configuration parameters of the mathematical model, the information generated by the SETPRE and SETUP functions for the rolling schedule to be sent to the lower mill supervision level, and data related to the configuration of the mill.
  • step 66 during which the reliability data are reset
  • step 67 in which the routine calls the CYCLIC function of the mathematical model.
  • step 74 if the result is positive, the routine moves on to a step 78, which checks whether the SYNC signal, indicating the last rolling pass, has been received. If the result is negative, the routine moves on to a step 79, which checks whether there is an interlock between the ADAPT and SETUP functions of the mathematical model. If the result is negative, the routine then moves on to a step 80, which sends the SYNC signal to the SETUP function of the mathematical model, and then on to a step 81, during which the code of the coil being rolled is extracted from the real-time database. In step 78, if the result is positive, control is transferred directly to this step 81; likewise, in step 79, if the result is positive, control is again transferred to said step 81.
  • a step 83 then follows during which the data related to the mill, the material, information related to the current status of the mill, the data related to the exchange between the CYCLIC and ADAPT functions, information related to the characteristics of the coil that is to be rolled or is currently being rolled and the data generated by the SETPRE and SETUP functions are read from the real-time database.
  • a step 84 then follows in which the reliability data are reset; this is followed by a step 85, during which the routine calls the ADAPT function of the mathematical model.
  • step 88 the routine moves on to a step 88, during which the parameters of the mathematical model are stored in the database; this is followed by a step 89, which checks whether a last rolling pass is being performed and whether the SETUP function has already been called.
  • step 87 the routine moves on from step 87 to a step 91 which writes to the real-time database the data related to the mill, to the material and to the parameters of the mathematical model.
  • step 92 during which the signal SYNC is sent to the routine of figure 3 to indicate that the process performed by the ADAPT function has ended.
  • step 93 checks whether a last rolling pass is being performed and whether the SETUP function has already been called.
  • control is transferred to a step 94, which sends the signal SYNC to the routine of figure 2 in order to start the SETUP function of the mathematical model.
  • step 95 during which the data of the parameters of the mathematical model are stored in the database.
  • step 93 if the result is positive, control is transferred directly to this step 95.
  • step 96 which updates in the database the data related to the motors, to friction and to the material; this is then followed by a step 97, which checks whether a last rolling pass is being performed. If the result is negative, the routine returns to step 73; if the result is positive, the routine moves on to a step 98, during which the tables related to the constraints that the mill must meet according to the characteristics of the material are updated in the database.
  • the routine then again returns from said step to the step 73.
  • a routine is described which is in charge of the activation of the SETPRE function of the mathematical model.
  • This function is activated again after generating the preliminary schedule if the operator wishes to make changes to said schedule.
  • the model compares the original schedule provided by the SETPRE function and the schedule modified by the operator and is capable of providing a new schedule, taking into account the recommendations of the operator.
  • Activation is manual on the part of the operator after he has modified the schedule.
  • This routine begins with a startup step 99, which is followed by a step 100 which waits for startup performed by the interface means of the mathematical model, that is to say, waits for activation by the operator.
  • the next step 101 reads the code of the coil and the code of the schedule from the real-time database.
  • the step 102 extracts from the database the data related to the material and the step 103 extracts from the database the characteristics of the coil to be rolled or currently being rolled.
  • the step 104 extracts, according to the characteristics of the rolled strip, the constraints with which the mill must comply.
  • the step 105 extracts the data calculated by the function 73 and the next step 106 reads the data related the mill, to the current status of the mill and the parameters of the model from the real-time database.
  • the next step 107 resets the data generated by the SETPRE and SETUP functions and the reliability data.
  • the next step 110 checks the reliability data; if the check is negative, control is transferred to the step 111, during which an error is returned to the interface means of the mathematical model; this is followed by a step 114 for storing the reliability data in the database.
  • the method according to the invention fully achieves the intended aim, since it allows to interact on-line with the mathematical model that creates the rolling schedule, keeping under control both the data related to the mill and the data related to the material to be rolled, in addition to the data related to any changes made by the user during rolling.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Feedback Control In General (AREA)
  • Testing And Monitoring For Control Systems (AREA)
EP98204277A 1997-12-17 1998-12-17 Verfahren zur Überwachung eines Walzwerkes, insbesondere zur On-Line-Steuerung des Walzprozesses in Sendzimir-Walzwerken Expired - Lifetime EP0924002B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97MI002794A IT1296879B1 (it) 1997-12-17 1997-12-17 Procedimento di supervisione di impianto di laminazione, particolarmente per il controllo in linea della laminazione in
ITMI972794 1997-12-17

Publications (3)

Publication Number Publication Date
EP0924002A2 true EP0924002A2 (de) 1999-06-23
EP0924002A3 EP0924002A3 (de) 2002-04-17
EP0924002B1 EP0924002B1 (de) 2005-04-13

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EP98204277A Expired - Lifetime EP0924002B1 (de) 1997-12-17 1998-12-17 Verfahren zur Überwachung eines Walzwerkes, insbesondere zur On-Line-Steuerung des Walzprozesses in Sendzimir-Walzwerken

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Country Link
EP (1) EP0924002B1 (de)
AT (1) ATE293018T1 (de)
DE (1) DE69829732T2 (de)
ES (1) ES2241098T3 (de)
IT (1) IT1296879B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2384830A1 (de) * 2010-05-03 2011-11-09 Converteam GmbH Verfahren zum Ermitteln von Parametern eines Modells für eine Walzanlage

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4745556A (en) * 1986-07-01 1988-05-17 T. Sendzimir, Inc. Rolling mill management system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4745556A (en) * 1986-07-01 1988-05-17 T. Sendzimir, Inc. Rolling mill management system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"MATHEMATICAL MODELLING FOR SENDZIMIR MILL PROCESS CONTROL" STEEL TIMES INTERNATIONAL, FMJ INTERNATIONAL PUBLICATIONS, REDHILL, SURREY, ENGLAND, GB, vol. 18, no. 1, 1994, pages 24-25, XP000426042 ISSN: 0143-7798 *
SERRANO A ET AL: "PREREGLAGE AUTOMATIQUE POUR LAMINOIRS REVERSIBLES *" CAHIERS D'INFORMATIONS TECHNIQUES DE LA REVUE DE METALLURGIE, REVUE DE METALLURGIE. PARIS, FR, vol. 87, no. 7 / 8, 1 July 1990 (1990-07-01), pages 669-679, XP000163066 ISSN: 0035-1563 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2384830A1 (de) * 2010-05-03 2011-11-09 Converteam GmbH Verfahren zum Ermitteln von Parametern eines Modells für eine Walzanlage

Also Published As

Publication number Publication date
IT1296879B1 (it) 1999-08-02
EP0924002B1 (de) 2005-04-13
DE69829732D1 (de) 2005-05-19
DE69829732T2 (de) 2006-02-16
EP0924002A3 (de) 2002-04-17
ES2241098T3 (es) 2005-10-16
ITMI972794A1 (it) 1999-06-17
ATE293018T1 (de) 2005-04-15

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