EP1239979B1 - Bandgeschwindigkeitsmessung in walzwerken - Google Patents

Bandgeschwindigkeitsmessung in walzwerken Download PDF

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Publication number
EP1239979B1
EP1239979B1 EP00984624A EP00984624A EP1239979B1 EP 1239979 B1 EP1239979 B1 EP 1239979B1 EP 00984624 A EP00984624 A EP 00984624A EP 00984624 A EP00984624 A EP 00984624A EP 1239979 B1 EP1239979 B1 EP 1239979B1
Authority
EP
European Patent Office
Prior art keywords
strip
uncoiler
coiler
velocities
reel
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.)
Expired - Lifetime
Application number
EP00984624A
Other languages
English (en)
French (fr)
Other versions
EP1239979A4 (de
EP1239979A1 (de
Inventor
Minyue The Univers.of Newcastle Resrch Asc.Ltd Fu
Graham Goodwin
William John Edwards
Glen Wallace
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.)
The University of Newcastle
Newcastle Innovation Ltd
Original Assignee
The University of Newcastle
Newcastle Innovation Ltd
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 The University of Newcastle, Newcastle Innovation Ltd filed Critical The University of Newcastle
Publication of EP1239979A1 publication Critical patent/EP1239979A1/de
Publication of EP1239979A4 publication Critical patent/EP1239979A4/de
Application granted granted Critical
Publication of EP1239979B1 publication Critical patent/EP1239979B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21B37/48—Tension control; Compression control
    • B21B37/52—Tension control; Compression control by drive motor control
    • B21B37/54—Tension control; Compression control by drive motor control including coiler drive control, e.g. reversing mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • 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
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/08—Coiler speed

Definitions

  • This invention relates to a technique for high precision estimation of strip velocities for rolling mills.
  • a typical rolling mill consists of an uncoiler, one or more mill stands and a coiler.
  • Each mill stand typically has four or more rolls, the inner pair of work rolls reduce the metal strip which passes between them, and the larger diameter backup rolls support the work rolls. Large forces are applied to the rolls so that the thickness of the metal strip is reduced as it passes between the work rolls. The exit thickness is controlled by adjusting the forces applied to, and speed of, the work rolls.
  • the present invention therefore provides a method of estimating the input and exit strip velocities at the roll gap in a rolling mill of the type having an uncoiler reel, a coiler reel and at least one pair of work rolls positioned therebetween, said method comprising the steps of:
  • the radii of the uncoiler and coiler reels are estimated by mathematically modeling the reels taking into account eccentricity effects and inter-wrap gaps.
  • the model includes a procedure to estimate initial coil radii using measurements of the surface velocity of the work rolls and an estimate of the slip ratio at the work rolls.
  • the estimation of the reel models is formulated as a non-linear least squares problem.
  • the said problem is solved using a relaxation algorithm, giving an estimate of uncoiler and coiler radii.
  • the method includes adaptive implementation of the relaxation algorithm.
  • the invention further comprises a method of estimating the exit thickness of strip in a rolling mill by estimating input and exit strip velocities using the method described above, and applying the estimated velocities in a mass flow balance equation.
  • R a ( t ) R ( t 0 ) ⁇ K ⁇ 0 t ⁇ ( ⁇ ) 2 ⁇ d ⁇
  • t 0 represents the initial time
  • t represent the current time
  • K represents the thickness of each layer which includes the strip thickness and inter-wrap gap.
  • R b in the reel radius model is used to capture eccentricity effects due to mandrel and other factors.
  • the prime issue in the strip velocity problem reduces to estimation of the parameter vectors ⁇ and ⁇ .
  • the optimisation above is non-linear because the transport delays depend on the strip velocities which in turn depend on the parameter vectors.
  • the present invention uses a relaxation algorithm to solve the optimisation problem. This is to be detailed below.
  • the initial reel radii are estimated by ignoring any eccentricity effects, inter-wrap gaps and transport delays between thickness measurements and the roll gap.
  • V r (t) the surface velocity of the work rolls are measured and that an estimate of average slip ratio s is also available.
  • V r (t) and s a rough estimate of the exit velocity is given by V r (t)( 1 + s).
  • the initial radius of the uncoiler radius can be estimated by balancing the input mass flow and exit mass flow over the time window from t 0 to t .
  • Step 2 Initialisation of the transport delays.
  • Step 3 Estimation of the eccentricity parameters.
  • the eccentricity parameters can be estimated by minimising the error function e(t) over the time window from t-T 0 to t. This is done using a standard least-squares method.
  • Step 4 Estimation of strip velocities.
  • Step 5 Re-estimation of transport delays.
  • Step 6 Recursion.
  • Steps 3-5 Repeat Steps 3-5 until the results for strip velocities converge. It is anticipated that only one repetition will be sufficient.
  • the reel models need to be frequently adjusted. If the required measurements are sampled using a common sampling frequency, it is preferred that the reel models are adjusted at each sampling point. That is, the aforementioned relaxation algorithm needs to be implemented using standard adaptive implementation techniques.
  • a method of estimating the input and exit strip velocities in a rolling mill is provided which is both inexpensive to implement and robust in operation.
  • the method does not require the use of any expensive hardware or measuring equipment, relying largely on a simple measurement of angular velocity, typically performed using pulse counting devices which are standard pieces of equipment in coilers and uncoilers and can be assumed to have extremely high accuracy. Furthermore, they are robust in use and inexpensive to provide.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Luminescent Compositions (AREA)
  • Metal Rolling (AREA)

Claims (7)

  1. Verfahren zum Bestimmen der Eintritts- und Austritts-Bandgeschwindigkeiten (V, v) am Walzenspalt in einem Walzwerk des Typs mit einer Abwickelrolle (1), einer Aufwickelrolle (2) und wenigstens einem Paar Arbeitswalzen (3), das dazwischen angeordnet sind, wobei das Verfahren die Schritte aufweist:
    Messen der Winkelgeschwindigkeiten (Ω,ω̅) der Abwickel- und Aufwickelrollen (1, 2); Bestimmten der Anfangsradien (R, r) der Abwickel- und Aufwickelrolle (1, 2); und Verwenden der erhaltenen gemessenen und bestimmten Werte, um abgeschätzte Geschwindigkeiten (V, v) des Streifens (4) vor und hinter dem Walzenspalt zu berechnen.
  2. Verfahren nach Anspruch 1, bei dem die Radien der Abwickel- und Aufwickelrolle bestimmt werden, indem die Rollen mathematisch modelliert werden, wobei Exzentrizitätswirkungen und Wickel-Zwischenspalte berücksichtigt werden.
  3. Verfahren nach Anspruch 2, bei dem das Modell eine Prozedur zum Bestimmen anfänglicher Spulenradien umfaßt, wobei Messungen der Oberflächengeschwindigkeit der Arbeitswalzen und eine Abschätzung des Schlupfverhältnisses an den Arbeitswalzen verwendet werden.
  4. Verfahren nach Anspruch 2 oder Anspruch 3, bei dem die Bestimmung der Rollenmodelle als ein nichtlineares Problem kleinster Quadrate formuliert wird.
  5. Verfahren nach Anspruch 4, bei dem das Problem gelöst wird, indem ein Relaxationsalgorithmus verwendet wird, was eine Abschätzung der Abwickel- und Aufwickelradien ergibt.
  6. Verfahren nach Anspruch 5, einschließlich adaptiver Implementierung des Relaxationsalgorithmus.
  7. Verfahren zum Bestimmen der Austrittsdicke des Bandes in einem Walzwerk durch Bestimmen von Eintritts- und Austritts-Bandgeschwindigkeiten, wobei ein Verfahren nach einem der vorangehenden Ansprüche verwendet wird und die bestimmten Geschwindigkeiten in einer Gleichung des Massenstromgleichgewichts eingesetzt werden.
EP00984624A 1999-12-08 2000-12-08 Bandgeschwindigkeitsmessung in walzwerken Expired - Lifetime EP1239979B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AUPQ453199 1999-12-08
AUPQ4531A AUPQ453199A0 (en) 1999-12-08 1999-12-08 Strip velocity measurement in rolling mills
PCT/AU2000/001525 WO2001041947A1 (en) 1999-12-08 2000-12-08 Strip velocity measurement in rolling mills

Publications (3)

Publication Number Publication Date
EP1239979A1 EP1239979A1 (de) 2002-09-18
EP1239979A4 EP1239979A4 (de) 2005-08-24
EP1239979B1 true EP1239979B1 (de) 2006-08-30

Family

ID=3818673

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00984624A Expired - Lifetime EP1239979B1 (de) 1999-12-08 2000-12-08 Bandgeschwindigkeitsmessung in walzwerken

Country Status (5)

Country Link
EP (1) EP1239979B1 (de)
AT (1) ATE337864T1 (de)
AU (1) AUPQ453199A0 (de)
DE (1) DE60030473T2 (de)
WO (1) WO2001041947A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10254178B4 (de) * 2002-11-21 2011-10-13 Abb Ag Verfahren zur Ermittlung von Zustandsgrößen eines Walzprozesses

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2810990A1 (de) * 1978-03-10 1979-09-13 Licentia Gmbh Banddickenregelung fuer ein walzgeruest
JPS57190268A (en) * 1981-05-20 1982-11-22 Mitsubishi Alum Co Ltd Detection of sheet speed for rolling mill
JPS62114713A (ja) * 1985-11-15 1987-05-26 Kawasaki Steel Corp スキンパスミルの伸び率検出方法
JP3201301B2 (ja) * 1997-01-28 2001-08-20 住友金属工業株式会社 被圧延材の厚さ制御方法及びその装置
KR100249821B1 (ko) * 1997-12-11 2000-03-15 정선종 압연공정 자동 판 두께 제어기의 실시간 시뮬레이터 및 시뮬레이션 모델링 방법
JPH11267725A (ja) * 1998-03-23 1999-10-05 Kawasaki Steel Corp 熱間連続圧延機の板厚制御方法

Also Published As

Publication number Publication date
EP1239979A4 (de) 2005-08-24
DE60030473T2 (de) 2007-04-19
AUPQ453199A0 (en) 2000-01-06
WO2001041947A1 (en) 2001-06-14
ATE337864T1 (de) 2006-09-15
DE60030473D1 (de) 2006-10-12
EP1239979A1 (de) 2002-09-18

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