EP0747143B1 - Procédé et installation de laminage à froid avec compensation d'ovalisation des cylindres de laminage - Google Patents
Procédé et installation de laminage à froid avec compensation d'ovalisation des cylindres de laminage Download PDFInfo
- Publication number
- EP0747143B1 EP0747143B1 EP96401181A EP96401181A EP0747143B1 EP 0747143 B1 EP0747143 B1 EP 0747143B1 EP 96401181 A EP96401181 A EP 96401181A EP 96401181 A EP96401181 A EP 96401181A EP 0747143 B1 EP0747143 B1 EP 0747143B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolling
- compensation
- cylinders
- housing
- signal
- 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.)
- Revoked
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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
- B21B37/58—Roll-force control; Roll-gap control
- B21B37/66—Roll eccentricity compensation systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
Definitions
- the invention relates to a method and an installation for rolling thin sheets, especially steel sheets.
- the strips are generally laminated in installations comprising a succession of rolling stands, by scrolling them in the air gap of each cage, delimited by the rolling rolls.
- rolling is carried out by controlling each cage of the installation, in particular on the basis of instructions for traction between the cages and / or tightening of the strip to be laminated between two cage working cylinders.
- a rolling installation comprising three rolling stands C1, C2, C3 can be driven by a control device S, in particular from the traction measurement interconnection of band B by sensors T2, T3 and / or by acting on the successive clamping means of each cage A1, A2, A3.
- the strictly circular character of the rolling rolls is one of the conditions for obtaining a constant thickness over the length of the band.
- These thickness variations are typically of the order of 0.5 ⁇ m for each cage of an installation, which would represent a variation of 0.2% on a 0.25 mm thick strip.
- the rolling stands of the the installation by applying a tightening instruction for the working cylinders of each cage and the defect of "runout" is identified by measuring, amplitude and in phase, the variations in force between said cylinders, then, in a second step during the rolling of a strip, we apply at the tightening instruction of the cylinders of each cage a signal compensation for the runout of the same amplitude as the fault previously measured, but in phase opposition.
- Such a method of compensating for a runout is a method of compensation in deferred time which is not effective when the failure to runout is not constant, especially when it varies during rolling, for example under the effect of deformations of the rolls resulting thermal constraints.
- a device for offset compensation is added to the installation described above and comprises thickness sensors E1, E2 arranged downstream of said cages, angular position sensors of cylinders V1, V2 and compensators P1, P2.
- the compensators P1, P2 evaluate the compensation signal of the tightening instruction to be applied to the clamping means A1, A2 of the cages C1, C2 to eliminate runout faults in the cylinders.
- the thickness measurement sensor is always offset by a few meters, for example 2.5 m, after leaving the air gap of a cage, which causes delay in locating cylinder runout faults of said cage with respect to the creation of the defect itself at the level of the air gap of the cage.
- the delay in detecting the fault can be of the order of 0.5 s for a cage-sensor distance of 2.5 m and a traveling speed tape in the 300 m / min cage.
- the thickness measurement signal supplied by the sensors E1, E2 presented a significant noise and that it was often difficult to discriminate between periodic variations in thickness of the strip relating to cylinder runout faults in relation to other thickness variations from other origins.
- the signals corresponding to the frequency are extracted from the spectrum obtained of rotation of the cylinders of the cages C1, C2 and a signal is generated compensation from these extracted signals.
- This high integration time is necessary to obtain a stable regulation of the operation of the runout compensation device.
- control loop for compensation of runout will have a response time of several tens seconds.
- the strip portions along which the runout defects persist represent a significant part of the band (up to half), which does not more allows to ensure sufficient commercial guarantee, for example the guaranteed thickness variation of less than 2.5% or 3%
- the real-time runout compensation process does not does not yet have the performance required to guarantee of sufficiently uniform thickness over an entire laminated strip, especially in the case of rolling thin sheets.
- the object of the invention is to provide a rolling process which allows to laminate a metal strip with very great regularity thick all along the strip.
- the invention also aims at a reliable and economical device for the implementation of this process.
- the subject of the invention is a method of cold rolling a strip between the rolls of rolling stands arranged one after the other on the other, in which a modification is made in real time to the cylinder clamping instruction of at least one of said cages, for compensate for faults in the runout of the cylinders of said cage and in which one evaluates said modification by analyzing in frequency a signal of measurement of a rolling parameter specific to said cage and by extracting measurement signal, periodic variations of the signal including frequencies correspond to the rotational speeds of said cylinders, so that obtain a compensation signal proportional to said periodic variations, characterized in that said measurement is a traction measurement of the strip immediately upstream of said cage.
- the invention also relates to a rolling installation comprising a succession of rolling stands, measuring sensors traction inter-clamping, clamping means for each cage, a control device, in particular for regulating said clamping means and at least one means of compensating for out-of-round faults in the cylinders rolling a cage of the succession of cages connected to the means of tightening said cage to deliver a compensation signal to them runout fault, characterized in that the compensation device is also connected to an intercage traction measurement sensor located immediately upstream of said cage (C2, C3) to receive the signal measurement of the traction measurement sensor (T2, T3) and evaluating said signal compensation.
- C2, C3 intercage traction measurement sensor located immediately upstream of said cage
- the rolling facility includes three rolling stands C1, C2, C3, a control device S, interage traction measurement sensors T2, T3, clamping means A1, A2, A3 of cages C1, C2, C3 and P'2 compensation devices, P'3.
- the measurement of the inter-cage traction corresponds to the tension of the strip between each cage and the sensors T2, T3 provided for this purpose are by example of deflector tensiometers.
- the clamping means A1, A2, A3 are mainly controlled by a setpoint issued by the control device S.
- the compensation devices P'2, P'3 have the function, as previously for the compensators P2, P3, to evaluate the signal of compensation intended to correct in real time the tightening instruction of the clamping means A2, A3 of the cages C2, C3 in order to eliminate the defect of runout of the cylinders of said cages.
- the compensation devices P2 and P3 are connected to the traction sensors T2 and T3.
- a strip B is laminated in regulating the operation of cages C1, C2, C3 of the installation using the control device S, in particular from the traction measurement band B interconnection by sensors T2, T3 and by acting on the successive clamping means of each cage A1, A2, A3.
- the compensators P'2, P'3 deliver said signal compensation to the clamping means A2, A3 by evaluating said signal at from the measurement signal delivered by the sensors T2, T3 upstream of the cages C2, C3.
- the invention is therefore applicable from the second cage of the rolling plant and to the last without installing sensors additional, since traction measurement sensors T2, T3 are already installed between each cage to allow the S device to control in a conventional manner the rolling installation.
- the compensation device P'2 is adapted in a manner known per se to extract from the signal of the sensor T2 periodic variations in the traction of band B upstream of the cage C2 which have a frequency equal to the speed of rotation of the cylinders of the C2 cage and to generate a compensation signal proportional to said variations extracted.
- the compensation device P'2 also takes into account the harmonics of runout faults, this is to say the periodic variations in the traction of band B which have a frequency multiple of the rotation speed of the cylinders of the cage C2.
- the signal could be integrated. measurement of traction over a much shorter duration than in prior art methods while reliably and accurately detecting faults in the round of the cylinders of the cage C2.
- the two working cylinders of the cage C2 may have slightly different rotational speeds, due in particular to slight differences in diameter, it is not necessary to choose a sufficiently long integration time to allow to discriminate the defect of false round of one of the cylinders by relation to each other and it is sufficient to evaluate the compensation signal from the average amplitude of the fault measured.
- the runout fault sensor is a traction sensor, there is no delay between the appearance of a fault and its detection, unlike the method of the prior art.
- the compensation devices are programmed to analyze frequency measurement signals with much shorter integration times than in the prior art.
- the overall response time of the regulation compensation for the runout according to the method of the invention is only 2.5 turns of the cylinder, approximately 2.5 seconds.
- the response time of the clamping means and the speed maximum tightening of these means can be limiting factors and critical for the implementation of the method according to the invention; of preferably, the response time of the clamping means must remain less the duration of a cylinder rotation.
- the compensation device and its operation which are described for cage 2 are also applicable to cage 3, or to other possible downstream cages.
- the output of rolling of metal strips with longitudinal variations thickness less than 5 ⁇ m, i.e. less than 0.7% for a 0.26 mm average thickness is less than 5 ⁇ m, i.e. less than 0.7% for a 0.26 mm average thickness.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Metal Rolling (AREA)
- Laminated Bodies (AREA)
- Lubricants (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Description
- temps de réponse typique d'un capteur de mesure d'épaisseur : 50 ms.
- retard dû à la distance cage-capteur : 500 ms.
- temps de réponse des moyens de serrage : 50 à 70 ms.
- la figure 1 est un schéma partiel d'une installation classique de laminage à froid avec son dispositif de pilotage.
- la figure 2 représente la même installation de laminage qu'à la figure 1 dotée d'un dispositif de compensation de faux rond des cylindres selon l'art antérieur.
- la figure 3 représente la même installation de laminage qu'à la figure 1 dotée d'un dispositif de compensation de faux rond des cylindres selon l'invention.
Claims (4)
- Procédé de laminage à froid d'une bande (B) entre les cylindres de cages de laminage (C1, C2, C3) disposées l'une à la suite de l'autre, dans lequel on apporte en temps réel une modification à la consigne de serrage des cylindres d'au moins une desdites cages (C1, C2, C3), pour compenser les défauts de faux-rond des cylindres de ladite cage (C2, C3) et dans lequel on évalue ladite modification en analysant en fréquence un signal de mesure d'un paramètre de laminage propre à ladite cage (C2, C3) et en extrayant du signal de mesure, les variations périodiques du signal dont les fréquences correspondent aux vitesses de rotation desdits cylindres, de manière à obtenir un signal de compensation proportionnel auxdites variations périodiques, caractérisé en ce que ladite mesure est une mesure de traction de la bande (B) immédiatement en amont de ladite cage (C2, C3).
- Procédé selon la revendication 1, caractérisé en ce qu'on extrait les variations périodiques du signal de mesure de traction par transformées de Fourier.
- Installation de laminage comportant une succession de cages de laminage (C1, C2, C3), des capteurs de mesure de traction intercage (T2, T3), des moyens de serrage (A1, A2, A3) pour chaque cage (C1, C2, C3), un dispositif de pilotage (S), notamment pour réguler lesdits moyens de serrage (A1, A2, A3) et au moins un moyen de compensation (P'2, P'3) de défauts de faux-rond des cylindres de laminage d'une cage (C2, C3) de la succession de cages (C1, C2, C3) relié aux moyens de serrage de ladite cage (C2, C3) pour leur délivrer un signal de compensation de défaut de faux-rond, caractérisée en ce que le dispositif de compensation (P'2, P'3) est également relié à un capteur de mesure de traction (T2, T3) intercage situé immédiatement en amont de ladite cage (C2, C3) pour recevoir le signal de mesure du capteur de mesure de traction (T2, T3) et évaluer ledit signal de compensation.
- Installation suivant la revendication 3, caractérisée en ce que le capteur de mesure de traction (T2, T3) est un tensiomètre à déflecteur.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9506747A FR2735046B1 (fr) | 1995-06-08 | 1995-06-08 | Procede de laminage a froid avec compensation d'ovalisation des cylindres de laminage. |
FR9506747 | 1995-06-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0747143A1 EP0747143A1 (fr) | 1996-12-11 |
EP0747143B1 true EP0747143B1 (fr) | 1999-09-15 |
Family
ID=9479731
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96401181A Revoked EP0747143B1 (fr) | 1995-06-08 | 1996-06-03 | Procédé et installation de laminage à froid avec compensation d'ovalisation des cylindres de laminage |
Country Status (8)
Country | Link |
---|---|
US (1) | US5799526A (fr) |
EP (1) | EP0747143B1 (fr) |
CN (1) | CN1065457C (fr) |
AT (1) | ATE184521T1 (fr) |
CA (1) | CA2178547C (fr) |
DE (1) | DE69604233T2 (fr) |
ES (1) | ES2135857T3 (fr) |
FR (1) | FR2735046B1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003045600A1 (fr) * | 2001-11-28 | 2003-06-05 | Posco Co., Ltd. | Procede et appareil de detection d'excentricite de cylindre de laminoir au moyen d'un generateur d'impulsions |
FR2887480B1 (fr) | 2005-06-23 | 2007-09-21 | Vai Clecim Soc Par Actions Sim | Procede et dispositif de regulation de l'epaisseur d'un produit lamine en sortie d'une installation de laminage en tandem |
RU2670630C9 (ru) * | 2013-12-24 | 2018-11-26 | Арселормиттал | Способ горячей прокатки |
DE102017200560A1 (de) * | 2017-01-16 | 2018-07-19 | Sms Group Gmbh | Verfahren für eine Zugregelung |
ES2966067T3 (es) * | 2019-08-16 | 2024-04-18 | Sms Group Gmbh | Procedimiento para la determinación en línea de al menos un parámetro de laminación y tren de laminación con un dispositivo para la determinación en línea de al menos un parámetro de laminación |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3848443A (en) * | 1973-05-31 | 1974-11-19 | Westinghouse Electric Corp | Automatic control method and apparatus for a rolling mill |
US4126027A (en) * | 1977-06-03 | 1978-11-21 | Westinghouse Electric Corp. | Method and apparatus for eccentricity correction in a rolling mill |
JPS606215A (ja) * | 1983-06-27 | 1985-01-12 | Toshiba Corp | ロ−ル偏芯除去装置 |
DD229945A1 (de) * | 1984-11-05 | 1985-11-20 | Mansfeld Kombinat W Pieck Veb | Anordnung zur automatisierten steuerung, bilanzierung und diagnose von band- bzw. folienwalzprozessen |
JPS61195706A (ja) * | 1985-02-26 | 1986-08-30 | Sumitomo Metal Ind Ltd | ロ−ル偏心解析装置と板厚制御方法 |
US4656854A (en) * | 1985-09-06 | 1987-04-14 | Aluminum Company Of America | Rolling mill eccentricity compensation using measurement of sheet tension |
CN1040073C (zh) * | 1989-12-25 | 1998-10-07 | 石川岛播磨重工业株式会社 | 轧机的板厚控制系统 |
US5103662A (en) * | 1990-05-01 | 1992-04-14 | Allegheny Ludlum Corporation | Tandem rolling mill tension control with speed ratio error discrimination |
-
1995
- 1995-06-08 FR FR9506747A patent/FR2735046B1/fr not_active Expired - Fee Related
-
1996
- 1996-06-03 EP EP96401181A patent/EP0747143B1/fr not_active Revoked
- 1996-06-03 ES ES96401181T patent/ES2135857T3/es not_active Expired - Lifetime
- 1996-06-03 AT AT96401181T patent/ATE184521T1/de not_active IP Right Cessation
- 1996-06-03 DE DE69604233T patent/DE69604233T2/de not_active Revoked
- 1996-06-07 CA CA002178547A patent/CA2178547C/fr not_active Expired - Fee Related
- 1996-06-07 CN CN96110488A patent/CN1065457C/zh not_active Expired - Fee Related
- 1996-06-10 US US08/661,156 patent/US5799526A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CN1146380A (zh) | 1997-04-02 |
CA2178547A1 (fr) | 1996-12-09 |
ES2135857T3 (es) | 1999-11-01 |
CA2178547C (fr) | 2004-08-10 |
EP0747143A1 (fr) | 1996-12-11 |
US5799526A (en) | 1998-09-01 |
DE69604233D1 (de) | 1999-10-21 |
CN1065457C (zh) | 2001-05-09 |
DE69604233T2 (de) | 2000-01-27 |
FR2735046A1 (fr) | 1996-12-13 |
FR2735046B1 (fr) | 1997-07-11 |
ATE184521T1 (de) | 1999-10-15 |
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