EP3437748A1 - Réglage de débit massique dans les installations de laminage - Google Patents

Réglage de débit massique dans les installations de laminage Download PDF

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Publication number
EP3437748A1
EP3437748A1 EP18181081.3A EP18181081A EP3437748A1 EP 3437748 A1 EP3437748 A1 EP 3437748A1 EP 18181081 A EP18181081 A EP 18181081A EP 3437748 A1 EP3437748 A1 EP 3437748A1
Authority
EP
European Patent Office
Prior art keywords
rolling
thickness
speed
strip
train
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
EP18181081.3A
Other languages
German (de)
English (en)
Other versions
EP3437748B1 (fr
Inventor
Jörn Sieghart
Andreas Gramer
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.)
SMS Group GmbH
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SMS Group GmbH
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Filing date
Publication date
Application filed by SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP3437748A1 publication Critical patent/EP3437748A1/fr
Application granted granted Critical
Publication of EP3437748B1 publication Critical patent/EP3437748B1/fr
Active legal-status Critical Current
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
    • 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
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/16—Adjusting or positioning rolls
    • 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
    • B21B2037/002—Mass flow control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2271/00—Mill stand parameters
    • B21B2271/02—Roll gap, screw-down position, draft position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/04—Roll speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/06—Product speed
    • 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

Definitions

  • the invention relates to a method for controlling a rolling train, preferably a cold rolling mill, which has one or more rolling stands with two work rolls each, which form a roll gap through which a rolled strip can be transported.
  • the invention further relates to a control device and a rolling train.
  • the thickness control of the rolled strip can be carried out during transport through the nip by means of a mass flow control, is calculated from the measured inlet side thickness and the measured inlet and outlet speeds, the thickness of the rolling stock after passing through the roll gap.
  • the speed measurement at the outlet of the mill is often difficult to achieve.
  • the measurement of the speed at the outlet of the first rolling stand can be difficult, for example due to slippage between rolling stock and measuring roll unit, emulsion / oil on the material being measured, steam or lack of space, for example if Laser is used for the measurement.
  • An object of the invention is to provide a method and an apparatus for controlling a rolling train, preferably a cold rolling mill, which enable a high degree of control accuracy with a design simplification of the rolling train.
  • the method according to the invention serves to control or regulate (here used synonymously) a rolling train, preferably a cold rolling mill.
  • the rolling train has one or more rolling stands, each with two work rolls on, which form a nip through which a rolled strip is transportable.
  • the rolled strip is a strip-shaped metal material, such as steel or a non-ferrous metal, which is subjected to a single or multi-stage rolling process by the work rolls.
  • One or both work rolls of the respective roll stand can be moved relative to one another, so that the roll gap, ie the distance between the work rolls, is adjustable.
  • a reference speed is provided, which is a parameter for controlling the rolling train.
  • the reference speed may, for example, be a target speed with which the rolled strip is to be transported through the rolling train, for example when the rolling train is in a stationary or quasi-stationary state after starting.
  • the reference speed may be a speed parameter with which a roller, preferably work roll, deflection roller or reel, is driven in the rolling train.
  • the reference speed may also be another parameter as long as it is not determined by measuring the exit speed of the rolling belt from the nip.
  • the reference speed may be set in advance, it may be constant or a function of time.
  • the speed and thickness of the rolled strip are measured prior to entering the nip.
  • the nip of the respective and / or one or more other stands in the rolling train is set based on the measured speed and thickness prior to entering the nip and the reference speed.
  • the control is therefore not taking into account any measured measured or calculated from actual sizes of the rolling train outlet side belt speed but using the reference speed, ie a parameter for controlling the rolling train.
  • the Calculation of the mass flow thickness, ie the product of belt speed and belt thickness which is a maintenance size when passing through the rolling stands (in the inlet of the rolling mill corresponds to the product of belt speed and belt thickness in the outlet of the rolling stand), the reference speed used in the outlet.
  • the speed measurement or speed calculation of the rolling belt at the output of the roll gap can be omitted. It can save costs that would otherwise incurred for the provision, installation, maintenance, etc. of corresponding sensors and electronic devices.
  • the control is less affected by measurement errors, which can occur in particular when measuring the speed at the outlet of the first stand, for example due to slippage between rolling stock and measuring roller unit, emulsion / oil on the material to be measured, steam or lack of space, for example when a laser is used for measurement becomes.
  • the reliability of the thickness control is increased, which in turn has a positive effect on the quality of the rolled product to be produced.
  • the illustrated control allows thickness control with high dynamics and direct reaction in the nip.
  • the difference between the actual thickness of the rolled strip at the exit of the rolling train and the target thickness is adjusted by means of a PI control or PID control in order to obtain the desired strip thickness in a reliable manner and with high accuracy.
  • a reference strip thickness is provided, which is a parameter for controlling the rolling train.
  • the reference strip thickness may be that target thickness which is desired for the rolled strip after passing through the rolling train, in particular when the rolling train is in a stationary or quasi-stationary state after starting.
  • the reference strip thickness may be set in advance, it may be constant or a function of time or a function of the length of the rolling stock.
  • a thickness deviation of the rolling belt is calculated taking into account the reference speed and the reference belt thickness.
  • the calculated thickness deviation is the difference between the inlet side mass flow thickness calculated, for example, by the divisor reference velocity and the reference strip thickness.
  • the outlet side strip thickness is further measured, from which a measured thickness deviation is determined and the measured thickness deviation compared with the calculated thickness deviation.
  • the reference speed for calculating the thickness deviation of the rolling belt is determined taking into account one or more correction values from a control of the train, the belt thickness, one or more drive torques and / or the speed control to improve the control accuracy.
  • the reference speed for calculating the thickness deviation of the rolled strip from a target speed and taking into account one or more additional quantities, such as the target thickness and / or the decrease of the roll roughness and / or the rolling force and / or the target draw, calculated.
  • the additional quantity is particularly preferably a lead, which can for example be calculated, accepted or otherwise determined.
  • the overfeed may be constant over the rolling process or a function of time or a function of the reference velocity.
  • the lead is calculated, wherein the calculation of the lead is at least one non-measured quantity and / or at least one measured Size includes.
  • the overfeed is preferably calculated taking into account various plant conditions before the start and / or during the rolling process, whereby the control accuracy and response of the roll gap in the thickness control can be ensured without measuring the outlet side belt speed.
  • the mass flow control of one or more rolling mills is operated without measuring and tracking the outlet side thickness, i. exclusively with inlet-side thickness and speed measurement.
  • the rolling mill on several rolling stands wherein the thickness of the rolling belt is measured behind the last roll stand and for adjusting the roll gap of one or more stands (in particular for determining the mass flow thickness at one or more rolling stands) the reference strip thickness is used, so that in this respect to a Measurement of the outlet side strip thickness can be dispensed with.
  • the reference strip thickness is used, so that in this respect to a Measurement of the outlet side strip thickness can be dispensed with.
  • the thickness control in the last roll stand can adjust the thickness offset to get to the desired target thickness.
  • All dynamic disturbances, such as disturbances of the inlet thickness and / or hardness fluctuations, according to a variant of this embodiment can already be compensated for by the first rolling stand.
  • a thickness measurement behind the first roll stand in this variant is not absolutely necessary, a corresponding thickness gauge can nevertheless be provided in order to provide a fallback possibility in the event of failure of the inlet-side thickness measurement.
  • the apparatus according to the invention for controlling a rolling train preferably cold rolling mill, is arranged to carry out a method as set forth above.
  • the control can be realized by means of an electronic circuit.
  • the control may be in the form of software which, if it is executed on a computing device, which causes appropriate calculations and steps to control the rolling mill.
  • the described control is particularly applicable to the operation of cold rolling mills for processing metal strips.
  • the rolling train can be designed as a reversing system with direction change in the tape guide.
  • the invention can be practiced in other fields as far as it relates to a rolling process in which a desired thickness of the rolled product is to be adjusted automatically.
  • FIG. 1 schematically shows a tandem mill with four successively arranged rolling stands.
  • FIG. 2 schematically shows a rolling stand with two support and two work rolls.
  • the FIG. 1 schematically shows a tandem mill or rolling mill 1 with four successively arranged rolling stands 10, preferably for a cold rolling mill.
  • the rolling train 1 has in the present example, a decoiler 2 and a take-up reel 3.
  • a rolled strip or rolling stock B is fed to the rolling stands 10 in the transporting direction R, optionally via deflection rollers, and after passing through the rolling stands 10, that is wound up after completion of the rolling of the take-up reel 3.
  • the supply and removal of the rolled strip B on the two reels 2 and 3 is only an example, the rolled strip B can be fed to the rolling stands 10 in other ways and discharged for further processing, transport, etc.
  • each rolling stand 10 has two back-up rolls 11 and two work rolls 12. It should be noted, however, that the method set forth is feasible and suitable for all scaffold arrangements having two or more rolls per scaffold.
  • the reference numerals 11 and 12 in the FIG. 1 not shown, but they go out of the FIG. 2 in which a rolling stand 10 is taken out and shown in an enlarged manner.
  • a work roll 12 is in each case with a support roller 11 in contact. Between the two work rolls 12 there is a roll gap through which the rolled strip B is passed.
  • the nip is adjustable by one or both of the nip forming work rolls 12 are adjustable relative to each other.
  • the work rolls 12 and / or back-up rolls 11 are driven, for example by one or more electric motors (not shown in the figures) in a rotating manner, possibly with the interposition of a transmission, a clutch, a brake, etc.
  • the rolling stands 10 each a drive control unit 33.
  • each rolling stand 10 is assigned a thickness control unit 30, which communicates with a respective gap control unit 31 for adjusting the gap between the corresponding work rolls 12.
  • a tension control 22 is arranged in front of each rolling stand 10, which has an actuator for changing the setting of the rolled strip B relative to the roll stand 10.
  • a change of employment is used to control the inlet side pull of the rolled strip B.
  • a train change is equivalent to a change in the speed of the rolled strip B.
  • the train controls 22 of the second to fourth stands 10 each have a train control unit 32 for adjusting the employment.
  • Possible communication paths between the control units 30, 31, 32, 33 and the associated actuators, actuators, motors, etc. are in the FIG. 1 schematically drawn.
  • the communication can be performed physically or wirelessly.
  • the control units 30, 31, 32, 33 in the FIG. 1 are shown separately, they can of course be integrally formed or about part of a central control.
  • the term "device” in this context does not necessarily mean a mechanical entity, because the control devices 30, 31, 32, 33 can also be realized by means of software which causes the control of the rolling mill 1 when it is executed on a computer.
  • the setting of the roll gap of the respective rolling stands 10 via a mass flow control is a conservation quantity, the product of the belt speed and the strip thickness displaced into the roll gap, which is referred to as "mass flow quantity" and, for example, analogous to an inlet side during passage of the rolled strip B through the roll stand 10 Thickness disorder or the change of other process variables such as strip strength, splitting friction and / or belt speed changed.
  • v i t * H i t v i - 1 t * H i - 1 t
  • v i (t) denotes the belt speed at the outlet of the roll stand 10 (equal to the belt speed at the entrance of a possibly subsequent roll stand 10) as a function of time.
  • h i (t) denotes the measured strip thickness at the outlet of the roll stand 10 (equal to the rolled strip thickness at the entrance of a possibly subsequent roll stand 10) as a function of time.
  • v i-1 (t) denotes the belt speed measured upstream of the rolling stand 10 as a function of time
  • h i (t) denotes the belt thickness measured upstream of the rolling stand 10.
  • the reference strip thickness is a parameter for controlling the rolling train.
  • the reference strip thickness may be that target thickness which is desired for the rolled strip after passing through the rolling train, in particular when the rolling train is in a stationary or quasi-stationary state after starting.
  • the reference tape thickness may be set in advance, it may be constant or a function of time and / or tape length.
  • a reference speed at the outlet v iR (t) is used to calculate the mass flow thickness. This is possible because the effects of a change in position of the rolled strip B relative to the rolling stand 10 by the tension control 22 can be neglected.
  • the change in the coasting speed only includes the change in pitch caused by the attitude change, which is very small relative to the absolute change, especially in the speed ranges in which mass flow control is performed.
  • the reference speed v iR (t) can therefore be a speed parameter with which the rolling train 1 is driven. It is therefore not necessary to measure or calculate a speed by sending a measured quantity which corresponds to the speed at the outlet of the roll gap.
  • the reference speed v iR (t) may, for example, be a target speed with which the rolled strip B is to be transported through the rolling train 1, for example when the rolling mill 1 is in a stationary or quasi-stationary state after starting.
  • the reference speed v iR (t) may, for example, also be a speed parameter with which a roller, preferably work roll 12 or reel, in the rolling train 1 is controlled.
  • the reference speed can be set in advance, it can be constant or a function of time or tape length. However, the reference speed may not include one or more correction values from other control systems. These correction values can consist of or be calculated, for example, from control corrections of the train, the belt thickness and / or from the speed control.
  • H iDevClac t H ITRK - 1 t * v i - 1 t v iR T - H iR
  • h iTrk-1 (t) designates the strip thickness B of the rolled strip B measured on the inlet side (on the first stand 10).
  • the rolled strip 10 having the band thickness deviation h iDevCalc (t) thus calculated is then pushed to the outgoing-side thickness gauge 20.
  • This calculated band thickness deviation which is transported on to the thickness gauge 20 at the outlet, is compared with the thickness deviation measured at the outlet.
  • the error is tracked, this also being done with the reference speed v iR (t) .
  • the difference between the actual thickness of the rolled strip 10 at the end of the rolling train 1 and the target thickness can be compensated for example by means of a PI controller or PID controller, as well as by a return via a filter unit.
  • the outlet-side thickness measurement can also be dispensed with.
  • the thickness control in the last roll stand 10 can adjust the thickness offset in order to arrive at the desired target thickness.
  • All dynamic disturbances such as disturbances of the inlet thickness and / or hardness fluctuations, can according to a variant of these Embodiment already be corrected by the first rolling stand 10.
  • a thickness measurement behind the first rolling stand 10 is not absolutely necessary in this variant, a corresponding thickness measuring device can nevertheless be provided in order to provide a fallback possibility in the event of failure of the inlet-side thickness measurement.
  • the speed measurement or speed calculation of the rolled strip B can be dispensed with at the outlet of one or more rolling stands 10. This can save costs that otherwise would be incurred for provision, installation, maintenance, etc. of corresponding sensors and control units.
  • the control is less affected by measurement errors, which can occur in particular when measuring the speed at the outlet of the first rolling stand 10, for example due to slippage between rolling stock and measuring roller unit, emulsion / oil on the material to be measured, steam or lack of space, for example if a laser for measurement is used.
  • the reliability of the thickness control is increased, which in turn has a positive effect on the quality of the rolled product to be produced.
  • the approach described allows thickness control with high dynamics and direct reaction in the nip.
  • control or regulation is particularly preferably applicable to cold rolling mills for rolling strip-shaped metal materials, in particular metal strips of steel or non-ferrous metals, the so-called non-ferrous metals.
EP18181081.3A 2017-08-01 2018-07-02 Réglage de débit massique dans les installations de laminage Active EP3437748B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15/665,806 US10799924B2 (en) 2017-08-01 2017-08-01 Mass flow regulation in roller devices

Publications (2)

Publication Number Publication Date
EP3437748A1 true EP3437748A1 (fr) 2019-02-06
EP3437748B1 EP3437748B1 (fr) 2020-02-12

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EP (1) EP3437748B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4249141A1 (fr) * 2022-03-25 2023-09-27 SMS Group GmbH Procédé de fonctionnement d'un train de laminage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111069300B (zh) * 2019-12-30 2021-07-09 新疆八一钢铁股份有限公司 一种冷轧特厚高精度电机壳钢生产方法
JP7375947B2 (ja) * 2020-09-04 2023-11-08 東芝三菱電機産業システム株式会社 タンデム冷間圧延機の制御システム

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0446622A (ja) * 1990-06-14 1992-02-17 Toshiba Corp 圧延機の板厚制御装置
EP1488863A2 (fr) * 2003-06-20 2004-12-22 ABB PATENT GmbH Système et procédé pour l'optimisation du réglage de la qualité de l'épaisseur dans un processus de laminage
DE102009012028A1 (de) 2009-03-10 2010-09-23 Converteam Gmbh Verfahren zum Betreiben einer Walzstraße insbesondere eines Kaltwalzwerkes
WO2011032888A1 (fr) * 2009-09-17 2011-03-24 Siemens Aktiengesellschaft Train de laminage à froid à régulation de débit massique sur une cage de laminoir

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787667A (en) * 1971-01-06 1974-01-22 Gen Electric Computer controlled metal rolling mill
DE3371749D1 (en) * 1982-11-11 1987-07-02 Davy Mckee Sheffield Rolling mill control for tandem rolling
JPS6149772A (ja) * 1984-08-13 1986-03-11 Tamura Seisakusho Co Ltd フラツクス面制御装置
JPS6149722A (ja) * 1984-08-20 1986-03-11 Nippon Kokan Kk <Nkk> 鋼ストリツプの板厚制御方法
JPH05169126A (ja) * 1991-12-26 1993-07-09 Siemens Ag コールドストリップ圧延設備のための制御方法
DE10254178B4 (de) * 2002-11-21 2011-10-13 Abb Ag Verfahren zur Ermittlung von Zustandsgrößen eines Walzprozesses
EP2620233A1 (fr) * 2012-01-24 2013-07-31 Siemens Aktiengesellschaft Procédé de traitement de produits laminés dans un laminoir

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0446622A (ja) * 1990-06-14 1992-02-17 Toshiba Corp 圧延機の板厚制御装置
EP1488863A2 (fr) * 2003-06-20 2004-12-22 ABB PATENT GmbH Système et procédé pour l'optimisation du réglage de la qualité de l'épaisseur dans un processus de laminage
DE102009012028A1 (de) 2009-03-10 2010-09-23 Converteam Gmbh Verfahren zum Betreiben einer Walzstraße insbesondere eines Kaltwalzwerkes
WO2011032888A1 (fr) * 2009-09-17 2011-03-24 Siemens Aktiengesellschaft Train de laminage à froid à régulation de débit massique sur une cage de laminoir

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4249141A1 (fr) * 2022-03-25 2023-09-27 SMS Group GmbH Procédé de fonctionnement d'un train de laminage

Also Published As

Publication number Publication date
EP3437748B1 (fr) 2020-02-12
US20190039107A1 (en) 2019-02-07
US10799924B2 (en) 2020-10-13

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