EP1239979A1 - Strip velocity measurement in rolling mills - Google Patents
Strip velocity measurement in rolling millsInfo
- Publication number
- EP1239979A1 EP1239979A1 EP00984624A EP00984624A EP1239979A1 EP 1239979 A1 EP1239979 A1 EP 1239979A1 EP 00984624 A EP00984624 A EP 00984624A EP 00984624 A EP00984624 A EP 00984624A EP 1239979 A1 EP1239979 A1 EP 1239979A1
- 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.)
- Granted
Links
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: measuring the angular velocities of the uncoiler and coiler reels; estimating the initial radii of the uncoiler and coiler reels; and applying the measured and estimated values obtained to calculate estimated velocities of the strip before and after the roll gap.
- 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.
- the basis for the soft-sensing technique in the present invention is a simple
- v is the exit strip velocity
- ⁇ and r are the angular velocity and radius of the coiler, respectively.
- the reel radius is linearly parameterised in terms of the following parameter vector
- the prime issue in the strip velocity problem reduces to estimation of the parameter vectors F and ⁇ .
- the key to the estimation of these parameters is the mass flow balance at the roll gap. More precisely, the relationship between the input thickness H, the input velocity V, the exit thickness /., and the exit velocity v at the roll gap is given by
- the radius estimates are linear in the parameter vectors.
- the following optimisation criterion can be used to estimate the parameter vectors T and ⁇ .
- T 0 represents the window duration for minimisation.
- Step 1 Initialisation of the Reel Radii
- 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/t surface velocity of the work rolls
- V t surface velocity of the work rolls
- the initial radius of the uncoiler radius can be estimated by balancing the input mass flow and exit mass flow over
- Step 2 Initialisation of the transport delays.
- the initial estimate for the exit transport delay is calculated using the measurement of the surface velocity of the work rolls, estimate of the average slip ratio and /, the distance between the roll gap and exit thickness measurement, given by
- Step 3 Estimation of the eccentricity parameters.
- the eccentricity parameters can be
- Step 4 Estimation of strip velocities.
- Step 5 Re-estimation of transport delays. This is done by solving
- 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)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPQ4531A AUPQ453199A0 (en) | 1999-12-08 | 1999-12-08 | Strip velocity measurement in rolling mills |
AUPQ453199 | 1999-12-08 | ||
PCT/AU2000/001525 WO2001041947A1 (en) | 1999-12-08 | 2000-12-08 | Strip velocity measurement in rolling mills |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1239979A1 true EP1239979A1 (en) | 2002-09-18 |
EP1239979A4 EP1239979A4 (en) | 2005-08-24 |
EP1239979B1 EP1239979B1 (en) | 2006-08-30 |
Family
ID=3818673
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00984624A Expired - Lifetime EP1239979B1 (en) | 1999-12-08 | 2000-12-08 | Strip velocity measurement in rolling mills |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1239979B1 (en) |
AT (1) | ATE337864T1 (en) |
AU (1) | AUPQ453199A0 (en) |
DE (1) | DE60030473T2 (en) |
WO (1) | WO2001041947A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10254178B4 (en) * | 2002-11-21 | 2011-10-13 | Abb Ag | Method for determining state variables of a rolling process |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57190268A (en) * | 1981-05-20 | 1982-11-22 | Mitsubishi Alum Co Ltd | Detection of sheet speed for rolling mill |
JPS62114713A (en) * | 1985-11-15 | 1987-05-26 | Kawasaki Steel Corp | Detection of elongation percentage of skin pass mill |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2810990A1 (en) * | 1978-03-10 | 1979-09-13 | Licentia Gmbh | Rolling mill delivering constant thickness strip - has operating conditions optimised using computer controlled variable factors |
JP3201301B2 (en) * | 1997-01-28 | 2001-08-20 | 住友金属工業株式会社 | Method and apparatus for controlling thickness of material to be rolled |
KR100249821B1 (en) * | 1997-12-11 | 2000-03-15 | 정선종 | A real-time simulator for rolling mill automatic gauge count roller and its simulation modelling method |
JPH11267725A (en) * | 1998-03-23 | 1999-10-05 | Kawasaki Steel Corp | Gage control method for continuous hot rolling machine |
-
1999
- 1999-12-08 AU AUPQ4531A patent/AUPQ453199A0/en not_active Abandoned
-
2000
- 2000-12-08 AT AT00984624T patent/ATE337864T1/en not_active IP Right Cessation
- 2000-12-08 DE DE60030473T patent/DE60030473T2/en not_active Expired - Fee Related
- 2000-12-08 WO PCT/AU2000/001525 patent/WO2001041947A1/en active IP Right Grant
- 2000-12-08 EP EP00984624A patent/EP1239979B1/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57190268A (en) * | 1981-05-20 | 1982-11-22 | Mitsubishi Alum Co Ltd | Detection of sheet speed for rolling mill |
JPS62114713A (en) * | 1985-11-15 | 1987-05-26 | Kawasaki Steel Corp | Detection of elongation percentage of skin pass mill |
Non-Patent Citations (3)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 007, no. 038 (P-176), 16 February 1983 (1983-02-16) -& JP 57 190268 A (MITSUBISHI ARUMINIUMU KK), 22 November 1982 (1982-11-22) * |
PATENT ABSTRACTS OF JAPAN vol. 011, no. 333 (M-637), 30 October 1987 (1987-10-30) -& JP 62 114713 A (KAWASAKI STEEL CORP), 26 May 1987 (1987-05-26) * |
See also references of WO0141947A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001041947A1 (en) | 2001-06-14 |
ATE337864T1 (en) | 2006-09-15 |
EP1239979B1 (en) | 2006-08-30 |
EP1239979A4 (en) | 2005-08-24 |
AUPQ453199A0 (en) | 2000-01-06 |
DE60030473D1 (en) | 2006-10-12 |
DE60030473T2 (en) | 2007-04-19 |
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