EP2839892A1 - Procédé de traitement de produits laminés dans une chaîne de laminage et chaîne de laminage - Google Patents

Procédé de traitement de produits laminés dans une chaîne de laminage et chaîne de laminage Download PDF

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Publication number
EP2839892A1
EP2839892A1 EP13181568.0A EP13181568A EP2839892A1 EP 2839892 A1 EP2839892 A1 EP 2839892A1 EP 13181568 A EP13181568 A EP 13181568A EP 2839892 A1 EP2839892 A1 EP 2839892A1
Authority
EP
European Patent Office
Prior art keywords
rolling
time
drive
speed
stand
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.)
Withdrawn
Application number
EP13181568.0A
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German (de)
English (en)
Inventor
Bernhard Weisshaar
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
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Priority to EP13181568.0A priority Critical patent/EP2839892A1/fr
Priority to US14/913,752 priority patent/US10500621B2/en
Priority to PCT/EP2014/067669 priority patent/WO2015024941A1/fr
Priority to CN201480046711.0A priority patent/CN105658347B/zh
Publication of EP2839892A1 publication Critical patent/EP2839892A1/fr
Withdrawn legal-status Critical Current

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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
    • B21B37/46—Roll speed or drive motor 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
    • B21B37/48—Tension control; Compression control
    • B21B37/52—Tension control; Compression control by drive motor control

Definitions

  • the invention relates to a method for processing rolling stock in a rolling train with at least two rolling stands, each having at least one roller, wherein each rolling mill is assigned a separate drive for the at least one roller and a rolling train.
  • the rolling stock passes through a rolling mill with several billets, for example, a preliminary, an intermediate and a finished block.
  • the rolling blocks each comprise a plurality of rolling stands, in which the rolling stock is rolled in several passes to tapes or wires.
  • wire rolling mill stands which have as rollers each two superimposed caliber rolling rings with alternately round and oval-shaped calibers whose cross-section decreases after each stitch.
  • round bars are made from billets with an approximately square cross-section.
  • the rotational speeds of the rolls of the individual rolling stands In order to roll the rolling stock at each roll stand to the desired thickness or the desired cross section, the rotational speeds of the rolls of the individual rolling stands must be controlled to a target value for the speed.
  • the individual speed setpoints and thus also a ratio of the speeds of rotation of the successive rolling stands to each other are usually given from a stitch plan.
  • the predetermined speed ratio In order to obtain the desired thickness or the desired cross-section of the processed rolling stock at the end of the rolling mill, the predetermined speed ratio must be kept as accurate as possible during machining, ie the actual values for the rotational speeds of the rolls of the successive rolling stands must always be within the given processing Speed ratio correspond.
  • each rolling stand of the rolling block with a separate drive, so its own engine and gearbox is driven.
  • the roll speeds of the rolls for each roll stand can be set independently for each drive via speed setpoints, which are set via a speed control available for each drive.
  • a wear of individual rolls or pairs of rolling rings can then be compensated by changing the speed setpoint to achieve the required roller speed of the respective drive.
  • no complicated in its construction mechanical transfer case is needed.
  • a major challenge of such a drive solution is the speed control of the individual rolling stands during the processing of rolling stock.
  • a rolling stand is tapped, ie when the rolling stock hits the rolls, acts on this a real load moment, which causes a collapse of the speed of the rollers on this rolling stand.
  • the rollers of other rolling stands to which no or a different, eg a smaller, real load moment acts at the moment of tapping, have an unchanged or only slightly changed speed. This has the consequence that the rotational speeds of the individual drives or rollers are no longer synchronous, so no longer work in a predetermined speed ratio to each other. This can lead to tensile or compressive loads and thus to a tearing of the wire or looping of the rolling stock between individual rolling stands.
  • the object of the invention is to provide a method for processing rolling stock, in which the above-mentioned disadvantages be avoided. It is also an object of the invention to provide a rolling train for carrying out the method.
  • the first object is achieved by a method having the features of patent claim 1.
  • a method according to the invention for processing rolling stock in a rolling train which comprises at least one rolling block having at least one roll, wherein each rolling mill is assigned a separate drive with a speed regulator for the at least one roll, becomes dependent at a time the time of loading the drive of the first stand of the rolling block with a real load torque for speed control of the drives the speed controller of each drive in response to an expected real load torque each supplied an additional value.
  • this first rolling stand is subjected to a real load moment.
  • the time of loading is thus the time of entry of the rolling stock into the mill, so that a real load torque is applied to this stand.
  • the speed controller of the drive of the first rolling stand and the speed regulators of the drives of the following rolling stands of the same rolling block, ie, all other rolling stands of the finished block at the same time in each case an additional value, for example a torque value supplied.
  • the time at which the respective additional value is supplied is chosen depending on the timing of the application so that the speed controller of the respective rolling stand compensates for the real load torque and thus prevents a speed drop there or at least largely compensated. Since system-related delays occur in a rolling mill, the additional value is ideally supplied at a time as a function of the time of the application, that a corresponding torque of the drives caused by the additional value takes place at the time in which the real load torque occurs. The additional value is determined depending on the expected real load torque, ie the real load torque, which is expected to occur at the entry of the rolling stock in the first rolling mill, for each speed controller of each drive and fed to the respective speed controller at the time of loading.
  • a simultaneous presetting of all speed controllers of all drives of a rolling block takes place at the time of tapping in the first roll stand with the additional value in order to ensure a simultaneous feedforward control of the rolling speeds of all rolling stands and thus a synchronization of all drives.
  • the output value of the speed controller is set to a non-zero initial value in order to achieve a faster response of the speed controller to a speed drop.
  • all speed controllers of all drives of the rolling block are simultaneously subjected to the respective additional value at a time shortly before, at the same time or shortly after the moment when the first rolling stand is acted upon by a real load moment, that is to say at a time dependent on the moment of application.
  • the speed controller of the first rolling stand or first drive subjected to a real load torque is supplied with the additional value, but the speed controller of each drive of each rolling stand of the rolling block, not only is the speed decrease at the drive subjected to a real load moment reduced . but also the speed ratio of the rolling stands of a rolling block to each other is maintained.
  • the speed regulators of the drives may have different regulators, e.g. P or PI controllers, to which the additional value can be supplied.
  • the respective additional value is supplied to the speed controller, which comprises a PI controller, as default of an I component.
  • the I component of the speed controller is set to a non-zero starting value in order to achieve a faster response of the speed controller to a speed drop.
  • a default setting of the I component of the speed controller in contrast to an additive additional value on the output variable has the advantage that the additional value does not have to be "turned off" again, but is automatically reduced by the speed controller.
  • an independent correction of the speed controller takes place in that the additional value is adjusted based on a comparison of the setpoint and actual values of the speeds.
  • the expected real load torque and the respective additional value are determined on the basis of a pass schedule.
  • a stitch plan for example, it is determined to which thickness the rolling stock is to be rolled in the individual rolling stands, and which speed setpoints must be set for this purpose. From this, load moments can be determined which are expected for the individual rolling stands.
  • the respective additional values are determined in the pass schedule from the determined expected real load torques and fed to the respective speed controller. This is particularly advantageous if no measured values for occurring real load moments are present, that is, for example, at the beginning of the processing.
  • the time of loading of the first roll stand of a rolling block is determined on the basis of various measured values.
  • the time of action of the drive of the first rolling stand with the real load torque is determined based on a measurement of a rolling force.
  • the entry of the rolling stock into the first roll stand ie the loading of the first rolling stand with a real load moment, triggers an almost sudden loading of the drive of the first rolling stand, so that the time of loading, ie the tapping point, via a measurement of the rolling force on the first roll stand can be detected.
  • Such a measurement of the rolling force is carried out in particular with a strain gauge, which is integrated, for example, in a base plate of the first rolling stand. Although this does not give an exact value for the rolling force, a value proportional to the rolling force is sufficient to determine the time of loading. If this value exceeds a threshold value, this is evaluated as an indicator for acting on the drive, ie the entry of the rolling stock into the rolling stand. The time at which this threshold is exceeded is thus considered as the time of loading the first stand with a real load moment. The supply of the respective additional value thus takes place shortly after the time of loading and the speed drop is reduced.
  • timing of the application of the drive of the first stand to determine with the real load torque based on a material tracking of the rolling stock.
  • This can be done for example by means of a model-based material tracking.
  • hot metal detectors for material tracking, which are arranged, for example, in front of the first roll stand of a rolling block.
  • detectors include, inter alia, a light barrier, with which the time can be detected, to which the front end of the rolling stock, so for example the wire tip, the detector passes. If the position of the detector with respect to the first roll stand or the running time of the rolling stock up to the first roll stand or the speed of the rolling stock is known, the time of loading can be determined therefrom.
  • delays occurring, for example, in determining the point in time of the application are taken into account.
  • Such a delay may be, for example, the response time of the aforementioned light barrier, which is then taken into account in the determination of the time of addition of the additional value.
  • time-delayed default of the speed controller For example, avoided a disadvantageous for the function of the method, time-delayed default of the speed controller.
  • delays in the speed controller and the drives are taken into account in order to determine the time at which the additional value is supplied.
  • These include, for example, moments of inertia of the drive, such as the current rise time of the motor.
  • the timing of the feed is corrected according to the delay time, so that the additional value is supplied at an earlier time corresponding to the duration of the delay.
  • the additional value is thus ideally supplied at one point in time as a function of the time of the application, that the corresponding torque of the drives caused by the additional value occurs exactly at the time in which the real load torque occurs.
  • the respective additional value is adapted during processing of the rolling stock on the basis of correction factors.
  • the correction factors of the individual additional values are equal to one.
  • the individual correction factors are adjusted.
  • the set values of the I components can be made mutable for each drive.
  • the second-mentioned object is achieved with a rolling train having the features of patent claim 9.
  • the rolling mill for machining rolling stock comprises at least one rolling block having at least two rolling stands each having at least one roll, wherein each rolling stand is assigned a separate drive with speed control for the at least one roll , and a control unit implementing software for performing the method of any one of the preceding claims.
  • FIG. 1 shows a section of a rolling train 2 with two rolling blocks 20, for example, an intermediate block 20a and a finished block 20b.
  • a rolling block 20 comprises at least two rolling stands 4, each having at least one roller 13, for example two rollers 13, for machining a rolling stock 6 FIG. 1
  • eight consecutive rolling stands 4 of a rolling block 20 are shown, for reasons of clarity, only for the finished block 20b, which passes through the rolling stock 6, for example a billet, which is rolled into wire.
  • Each rolling stand 4 is a separate drive 8, comprising a motor 10 and a transmission 12, associated with a speed controller 14, which in FIG. 1 for reasons of clarity, only for a rolling mill 4 is shown.
  • the speed controller 14 controls the roller 13 of the respective drive 8 to a desired value for the speed n soll .
  • the speed controller 14 of the drive 8 constantly an actual value of the speed n is detected, with the setpoint of the speed n soll , which is determined, for example, based on a stitch plan, compared and adapted.
  • the rolling train 2 comprises a control / regulating unit 24 - likewise shown only for a rolling stand 4 - in which software for carrying out the method is implemented.
  • FIG. 2 shows a speed control 26 for a rolling block 20 with a plurality of rolling stands 4 for controlling the speeds n Ist, i all drives 8 and thus the rollers 13 of the rolling stands 4 of the rolling block 20, for example, the finished block 20b.
  • Each drive 8 is associated with a speed controller 14, which comprises a PI controller, which is a control difference between the actual value of Speed n Ist, i and the setpoint of speed n soll, i are detected and controlled.
  • the speed control 26 comprises a current or torque control circuit 28 for each drive 8, which supplies power to the motor 10 and controls it to a desired operating point and which takes into account the moments of inertia of the drive 8 in the control.
  • the first rolling stand 4 of the rolling block 20 is acted upon at a time t B with a real load torque.
  • an additional value ZW is supplied to the speed controller 14 of each drive 8 as a function of the expected real load torque at a time t ZW for speed control of the drives 8.
  • all drives 8 at a time t ZW which was determined as a function of the time t B and, for example, shortly before, at or shortly after this time t B of the admission is pre-occupied with an additional value ZW.
  • This is supplied to the respective PI controller of the respective drive 8 as default of the I component.
  • Each drive 8 or the respective speed controller 14 is therefore supplied with the respective additional value ZW at the time t ZW .
  • the expected real load torque and the respective additional value ZW are determined using a pass schedule and fed to the PI controller of the respective speed controller 14 at a time t ZW .
  • the speed controller 14 is released again in the next system clock and regulates the control difference between the actual value of the rotational speed n actual, i and the target value of the rotational speed n target, i .
  • a measuring device 22 available. With the measuring device 22, the time t B of the loading of the first roll stand 4 with the real load torque, for example, based on a measurement of the rolling force M is determined.
  • the measuring device 22 for measuring the rolling force is designed as a strain gauge, which is arranged in the first rolling stand 4.
  • the time t B of the loading of the first roll stand 4 is determined with the real load torque based on a material tracking.
  • the measuring device 22 has a "hot metal detector" which is arranged in front of the first rolling stand 4 and detects the point in time at which the rolling stock 6 passes through it.
  • the time t B of the loading of the first rolling stand 4 with the real load torque is thus determined even before the entry of the rolling stock 6 in the first rolling stand 4 of the rolling block 20.
  • the time t ZW is determined. At the time t ZW is the rolling stock 6, as in FIG. 1 indicated by dashed lines, even before the first rolling stand. 4
  • the synchronicity of the individual rolling stands 4 of the rolling block 20b and of the last stand of the rolling block 20a, ie their speed ratio to one another, is ensured when the rolling stock 6 enters the rolling block 20b.
  • a specified from the stitch plan speed ratio of the rolling stands 4 thus remains throughout the processing of rolling stock 6 constant. This prevents looping between the individual rolling stands 4 of a rolling block 20 and between the rolling blocks 20a and 20b.
  • the respective additional value ZW is adapted during the processing of the rolling stock 6 on the basis of correction factors K i , whereby the additional values for each drive can still be made invulnerable and thereby made more accurate while eliminating incalculable dirt effects.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
EP13181568.0A 2013-08-23 2013-08-23 Procédé de traitement de produits laminés dans une chaîne de laminage et chaîne de laminage Withdrawn EP2839892A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP13181568.0A EP2839892A1 (fr) 2013-08-23 2013-08-23 Procédé de traitement de produits laminés dans une chaîne de laminage et chaîne de laminage
US14/913,752 US10500621B2 (en) 2013-08-23 2014-08-19 Method for processing material to be rolled on a rolling line, and rolling line
PCT/EP2014/067669 WO2015024941A1 (fr) 2013-08-23 2014-08-19 Procédé de traitement d'un produit à laminer dans un train de laminoir et train de laminoir
CN201480046711.0A CN105658347B (zh) 2013-08-23 2014-08-19 用于在轧制线中加工轧材的方法和轧制线

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13181568.0A EP2839892A1 (fr) 2013-08-23 2013-08-23 Procédé de traitement de produits laminés dans une chaîne de laminage et chaîne de laminage

Publications (1)

Publication Number Publication Date
EP2839892A1 true EP2839892A1 (fr) 2015-02-25

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EP13181568.0A Withdrawn EP2839892A1 (fr) 2013-08-23 2013-08-23 Procédé de traitement de produits laminés dans une chaîne de laminage et chaîne de laminage

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Country Link
US (1) US10500621B2 (fr)
EP (1) EP2839892A1 (fr)
CN (1) CN105658347B (fr)
WO (1) WO2015024941A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3362199B1 (fr) 2015-10-15 2020-02-19 SMS Group GmbH Procédé pour laminer une matière à laminer et laminoir

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110418683B (zh) * 2017-03-13 2021-01-15 Sms集团有限公司 用于运行辊式矫直机的方法以及辊式矫直机
IT201700107113A1 (it) * 2017-09-25 2019-03-25 Danieli Off Mecc Procedimento di regolazione del tiro di una barra e relativo dispositivo

Citations (3)

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Publication number Priority date Publication date Assignee Title
DE2413492A1 (de) * 1974-03-20 1975-10-02 Siemens Ag Verfahren und schaltungsanordnung zur gegenseitigen abstimmung der antriebsdrehzahlen einer mehrgeruestigen walzstrasse mit einzelantrieben
DE19726586A1 (de) * 1997-06-23 1999-01-07 Siemens Ag Verfahren und Einrichtung zur Verringerung bzw. Kompensation von Drehzahleinbrüchen beim Einfädeln eines Walzgutes in ein Walzgerüst
WO2012014026A1 (fr) * 2010-06-09 2012-02-02 Danieli Automation Spa Procédé et dispositif permettant de réguler les tailles des sections d'un produit laminé

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GB800109A (en) * 1955-01-11 1958-08-20 Svenska Metallverken Ab Improvements in and relating to the control of electric motors driving metal-blank rolling mills and the like
JPS55149714A (en) * 1980-05-02 1980-11-21 Hitachi Ltd Method and apparatus for controlling continuous rolling mill
JPS6016850B2 (ja) 1981-02-06 1985-04-27 住友金属工業株式会社 コ−ルドタンデムミルの圧延速度揃速方法
KR20040040774A (ko) * 2002-11-08 2004-05-13 주식회사 포스코 열간 사상압연기에서 임팩트 드롭 방지를 위한 스피드제어방법
CN100441328C (zh) 2006-01-25 2008-12-10 冶金自动化研究设计院 一种抑制轧机传动***动态速降和扭振的控制***
DE102007027943B3 (de) 2007-06-18 2008-10-16 Mtu Friedrichshafen Gmbh Verfahren zur Regelung des Raildrucks während eines Startvorgangs
DE102009050710B4 (de) * 2009-10-26 2016-08-04 Sms Group Gmbh Drahtwalzgerüst mit Einzelantrieb
DE102010041830A1 (de) * 2010-09-30 2012-04-05 Automotive Lighting Reutlingen Gmbh Steuer- und Regeleinrichtung für eine Gasentladungslampe eines Kraftfahrzeugscheinwerfers
DE102010044142A1 (de) 2010-11-18 2012-05-24 Robert Bosch Gmbh Verfahren zum Ausblenden einer Störung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2413492A1 (de) * 1974-03-20 1975-10-02 Siemens Ag Verfahren und schaltungsanordnung zur gegenseitigen abstimmung der antriebsdrehzahlen einer mehrgeruestigen walzstrasse mit einzelantrieben
DE19726586A1 (de) * 1997-06-23 1999-01-07 Siemens Ag Verfahren und Einrichtung zur Verringerung bzw. Kompensation von Drehzahleinbrüchen beim Einfädeln eines Walzgutes in ein Walzgerüst
WO2012014026A1 (fr) * 2010-06-09 2012-02-02 Danieli Automation Spa Procédé et dispositif permettant de réguler les tailles des sections d'un produit laminé

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3362199B1 (fr) 2015-10-15 2020-02-19 SMS Group GmbH Procédé pour laminer une matière à laminer et laminoir

Also Published As

Publication number Publication date
US10500621B2 (en) 2019-12-10
CN105658347A (zh) 2016-06-08
WO2015024941A9 (fr) 2016-04-14
US20160214153A1 (en) 2016-07-28
CN105658347B (zh) 2019-01-08
WO2015024941A1 (fr) 2015-02-26

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