EP0928644B1 - Procédé de pilotage d'une opération d'écrouissage en continu d'une bande métallique - Google Patents
Procédé de pilotage d'une opération d'écrouissage en continu d'une bande métallique Download PDFInfo
- Publication number
- EP0928644B1 EP0928644B1 EP99400036A EP99400036A EP0928644B1 EP 0928644 B1 EP0928644 B1 EP 0928644B1 EP 99400036 A EP99400036 A EP 99400036A EP 99400036 A EP99400036 A EP 99400036A EP 0928644 B1 EP0928644 B1 EP 0928644B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cage
- regulation
- elongation
- strip
- 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.)
- Expired - Lifetime
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Images
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
- B21B37/56—Elongation control
-
- 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
- B21B2001/228—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 skin pass rolling or temper rolling
Definitions
- the invention relates to a method for controlling an operation. continuous hardening and reduction of a metal strip in a work hardening installation, comprising at least two successive cages of rolling.
- a rolling or work hardening cage of this type of installation has two working cylinders rotating in opposite directions in the air gap which a metal strip can be reduced and / or hardened; in terms of the clamping force of these cylinders, the thickness of the metal strip is reduced and its length, on the contrary, increased.
- the elongation rate obtained is depending on the clamping force of the cage; in the case of a “skin-pass”, the elongation rate is low, whereas in the case of a “DR” operation, it can reach around 60%.
- the cage speed differential depends therefore the rate of elongation of the strip.
- the invention relates to a method for adjusting these actuators according to of these measures.
- Mode 2 is shown schematically in the block diagram of Figure 1, where 1 ', 2 and 3 respectively designate the “S-block”, the first cage and the second cage ; 4A and 4B the elongation rate measurement device.
- the transfer function of regulation B is complex because the law of behavior linking force and elongation is not at all linear; this law of behavior is similar to the classical law of behavior linking the tensile and elongation, as shown in Figure 4.
- regulation B is of the “band” type dead ”.
- the invention aims to remedy these drawbacks.
- the clamping force of this cage is adjusted so as to maintain said measured voltage within a predetermined range of values, the possible modification of the clamping force only intervening when said belt tension leaves said range; this type of setting is conventionally called “dead band regulation”.
- the strip work hardening installation continuous metal comprises, in the direction of travel of the band B, a unwinder 7, an input S block 1 ', a first cage 2 then a second cage 3, an outlet S-block 5 and a rewinder 6.
- the unwinder 7 and the rewinder 6 are of a conventional type and will not be not described in detail.
- the “S” blocks 1 ', 5, composed of two support rollers strip, are used in a conventional manner to vary the tension of strip B; one of the rollers of each block is provided with non-tachometric means shown 4A, 4B adapted to accurately measure the speed of passage of band B in these blocks 1 ', 5.
- Each cage 2, 3 has two supported working rolls each by a support cylinder; means not shown allow to varying the clamping force of the working rolls towards each other; other means not shown allow the speed of rotation to be varied working cylinders of each cage.
- the work hardening installation also includes means (not shown) to measure the belt tension between stands 2 and 3.
- the measurement of the elongation rate of the upstream cage 2 conventionally follows from the tachometric measurements practiced in 4A, 4B at level of block in S input 1 'and output 5, after deduction of the rate reduced elongation of the cage 3.
- the regulation B ′ is preferably of the “dead band” type, that is to say that the clamping force is only acted on if the tension of the strip comes out of a predetermined range of values (the maximum corresponding for example to a risk of rupture, the minimum, for example, a risk of creases).
- the gain of regulation B ' must be adapted so that the response time of this regulation is much greater than the response time responds to regulation A '.
- the regulation operation B ′ can even be carried out "Manually" by the installation operator.
- the purpose of this example is to compare the performance of the regulation according to the invention compared to those of a conventional art regulation previous in the case of a steel strip rolling operation carried out after annealing (called "double reduction").
- Figure 8 illustrates these fluctuations in the classic case where pull-ups are regulated by speed and where the band elongation (or thickness) is regulated either directly by tightening the reduction cage or indirectly by traction interlining with recentering by tightening the reduction cage; there are significant fluctuations in the elongation: ⁇ 3% around the average value of 37.5%.
- Figure 9 illustrates, facing the same disturbance, these fluctuations in the case, according to the invention, the intercage traction is regulated by the tightening of the reduction cage and where the elongation is directly regulated by the speed of the last cage; we note that the elongation remains almost constant, the fluctuations being reduced by a factor of at least 5 compared to the case previous.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Metal Rolling (AREA)
- Control Of Heat Treatment Processes (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
- régulation selon le mode 1 : le taux d'allongement est régulé par la traction intercage.
- régulation selon le mode 2 (les références concernent la fig. 1 ci-après) :
- régulation d'allongement par le rapport entre la vitesse du « bloc en S » 1' en amont et celle de la première cage 2 en aval ;
- régulation (système « ATL » à bande morte) de la traction entre le « bloc en S » 1' et la première cage 2 en fonction du même rapport de vitesse et du serrage de la première cage 2.
- régulation selon le mode 3 identique à celle du mode 2, où l'on remplace les mesures de taux d'allongement par des mesures d'épaisseur (« THG »).
- régulation des tractions intercages par la vitesse,
- régulation d'allongement par le serrage de la cage 2 et par la traction entre les cages 2 et 3.
- régulation de la traction intercage par la vitesse,
- régulation d'allongement par le serrage et, optionnellement, la traction intercage.
- un temps de réponse trop long, car il doit rester supérieur à celui de la régulation A ;
- une précision insuffisante, notamment à cause de la bande morte et de la complexité (non linéarité) de la fonction de transfert.
- on fait passer la dite bande dans l'entrefer des cylindres de travail d'au moins deux cages de laminage successives, une cage amont assurant l'essentiel de ladite réduction d'épaisseur et une cage aval,
- on mesure le taux d'allongement de la bande apporté par cette cage,
- on mesure la tension de la bande en aval de cette cage,
- régler la vitesse des cylindres de cette cage par rapport à celle des cylindres de la cage aval en fonction de la mesure du taux d'allongement,
- régler la force de serrage de cette cage en fonction de la mesure de tension en aval,
- les figures 1 à 3 sont des synoptiques de régulation de l'art antérieur,
- la figure 4 représente une loi de comportement typique de variation de la traction (N/mm2) de la bande en fonction de son allongement (%) dans une cage de réduction et/ou d'écrouissage,
- la figure 5 représente une vue schématique en perspective d'une installation de réduction et/ou d'écrouissage à deux cages qui peut être pilotée par le procédé selon l'invention,
- les figures 6 et 7 sont des synoptiques de régulation selon l'invention,
- les figures 8 et 9 illustrent les performances de régulation d'installation d'écrouissage, exprimées en stabilité de la valeur d'allongement (%) en fonction du temps (secondes), dans le cas d'une régulation selon l'art antérieur (figure 8) et d'une régulation selon l'invention (figure 9).
- régulation de la traction intercage par le serrage de la cage amont 2,
- régulation d'allongement par la vitesse.
- une très grande précision du taux d'allongement de la bande : pour des taux d'allongement correspondant à une opération de « skin-pass » et généralement compris entre 0,4% et 4%, on atteint une précision de ± 0,05 %.
- une très grande « robustesse » de régulation, car la fonction de transfert de la régulation A' est linéaire puisque ce sont des mesures de vitesse de bande qui agissent sur un actionneur de vitesse.
- une très grande régularité dans la précision et un temps de réponse très court, ce qui permet de diminuer sensiblement le chutage de bande ; l'actionneur de vitesse étant beaucoup plus rapide que l'actionneur de serrage, pour la régulation A', on atteint un temps de réponse de 200 ms.
- la première cage 1 joue le rôle du « bloc en S » 1' de l'installation précédemment décrite , sa vitesse servant à régler la traction devant la deuxième cage 2 (voir figure 7) ; cette première cage ne réalise quasiment aucun allongement comme la dernière cage 3 de l'exemple précédent ; cette première cage a donc une fonction de « pinceur » de bande.
- les deux autres cages fonctionnent comme les cages 2 et 3 de l'exemple précédent.
- régulation de la première traction intercage par la vitesse, comme dans l'art antérieur (figure 2),
- régulation de la deuxième traction intercage, en aval de la cage 2, par le serrage de la cage 2, qui est la cage qui applique la réduction d'épaisseur principale,
- régulation d'allongement par la vitesse relative des cages 2 et 3.
Claims (2)
- Procédé de pilotage d'une opération d'écrouissage et de réduction d'épaisseur en continu d'une bande métallique B dans lequel :on fait passer la dite bande dans l'entrefer des cylindres de travail d'au moins deux cages de laminage successives, une cage amont (2) assurant l'essentiel de ladite réduction d'épaisseur et une cage aval (3),on mesure le taux d'allongement de la bande apporté par cette cage (2),on mesure la tension de la bande en aval de cette cage (2),régler la vitesse des cylindres de cette cage (2) par rapport à celle des cylindres de la cage aval (3) en fonction de ladite mesure du taux d'allongement,régler la force de serrage de cette cage (2) en fonction de ladite mesure de tension en aval,
- Procédé selon la revendication 1 caractérisé en ce que l'on règle la force de serrage de cette cage (2) de manière à maintenir ladite tension mesurée dans une fourchette prédéterminée de valeurs, la modification éventuelle de la force de serrage n'intervenant que lorsque ladite tension de bande sort de ladite fourchette.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9800214 | 1998-01-13 | ||
FR9800214A FR2773505B1 (fr) | 1998-01-13 | 1998-01-13 | Procede de pilotage d'une operation d'ecrouissage en continu d'une bande metallique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0928644A1 EP0928644A1 (fr) | 1999-07-14 |
EP0928644B1 true EP0928644B1 (fr) | 2002-12-18 |
Family
ID=9521671
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99400036A Expired - Lifetime EP0928644B1 (fr) | 1998-01-13 | 1999-01-08 | Procédé de pilotage d'une opération d'écrouissage en continu d'une bande métallique |
Country Status (7)
Country | Link |
---|---|
US (1) | US6079242A (fr) |
EP (1) | EP0928644B1 (fr) |
AT (1) | ATE229849T1 (fr) |
BR (1) | BR9900047A (fr) |
CA (1) | CA2259110C (fr) |
DE (1) | DE69904513T2 (fr) |
FR (1) | FR2773505B1 (fr) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19729773C5 (de) * | 1997-07-11 | 2007-05-10 | Siemens Ag | Verfahren und Einrichtung zum Walzen eines Metallbandes |
DE19903926A1 (de) * | 1999-02-01 | 2000-08-03 | Sms Demag Ag | Verfahren und Anlage zum Umformen von Metallband |
KR20050010182A (ko) * | 2003-07-18 | 2005-01-27 | 현대자동차주식회사 | 판재의 내덴트성 향상 방법 |
US9309714B2 (en) | 2007-11-13 | 2016-04-12 | Guardian Ig, Llc | Rotating spacer applicator for window assembly |
WO2009064915A1 (fr) * | 2007-11-13 | 2009-05-22 | Infinite Edge Technologies, Llc | Écarteur pour fenêtre renforcé |
WO2011008860A1 (fr) | 2009-07-14 | 2011-01-20 | Infinite Edge Technologies, Llc | Bandes étirées pour dispositif despacement et unité détanchéité |
WO2011156722A1 (fr) | 2010-06-10 | 2011-12-15 | Infinite Edge Technologies, Llc | Applicateur d'entretoise de fenêtre |
US9228389B2 (en) | 2010-12-17 | 2016-01-05 | Guardian Ig, Llc | Triple pane window spacer, window assembly and methods for manufacturing same |
US9260907B2 (en) | 2012-10-22 | 2016-02-16 | Guardian Ig, Llc | Triple pane window spacer having a sunken intermediate pane |
US9689196B2 (en) | 2012-10-22 | 2017-06-27 | Guardian Ig, Llc | Assembly equipment line and method for windows |
KR20180117732A (ko) * | 2014-07-15 | 2018-10-29 | 노벨리스 인크. | 자려 1/3 옥타브 밀 진동의 댐핑 프로세스 |
EP3171995B1 (fr) | 2014-07-25 | 2018-07-11 | Novelis Inc. | Limitation du broutage de tiers d'octave de laminoir par un procédé d'amortissement |
CN105224793B (zh) * | 2015-09-21 | 2017-11-21 | 中冶南方工程技术有限公司 | 干平整带钢屈服强度和摩擦系数的联合修正方法 |
CN105414201B (zh) * | 2015-12-10 | 2017-11-03 | 安徽马钢自动化信息技术有限公司 | 一种提高光整机加减速时延伸率控制精度的方法 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US30933A (en) * | 1860-12-18 | Improvement in harvesting-machines | ||
US3820365A (en) * | 1973-03-23 | 1974-06-28 | Westinghouse Electric Corp | Automatic extension control |
US4016740A (en) * | 1973-12-27 | 1977-04-12 | Nippon Steel Corporation | Method and an apparatus for the manufacture of a steel sheet |
US4188812A (en) * | 1979-01-03 | 1980-02-19 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Installation for production of continuously cold rolled sheet metal or strip |
JPS57193213A (en) * | 1981-05-22 | 1982-11-27 | Nippon Steel Corp | Tension controller |
JPS6213209A (ja) * | 1985-07-09 | 1987-01-22 | Mitsubishi Electric Corp | 伸び率制御装置 |
JPS62275514A (ja) * | 1986-05-20 | 1987-11-30 | Sumitomo Metal Ind Ltd | スキンパスミルの伸率制御方法 |
US5054302A (en) * | 1989-04-07 | 1991-10-08 | Kawasaki Steel Corporation | Hardness compensated thickness control method for wet skin-pass rolled sheet |
JPH03128111A (ja) * | 1989-10-12 | 1991-05-31 | Toshiba Corp | ストリップの伸び率制御装置 |
JPH04305305A (ja) * | 1991-03-29 | 1992-10-28 | Kawasaki Steel Corp | 調質圧延機の伸率制御方法 |
-
1998
- 1998-01-13 FR FR9800214A patent/FR2773505B1/fr not_active Expired - Fee Related
-
1999
- 1999-01-08 EP EP99400036A patent/EP0928644B1/fr not_active Expired - Lifetime
- 1999-01-08 AT AT99400036T patent/ATE229849T1/de not_active IP Right Cessation
- 1999-01-08 DE DE69904513T patent/DE69904513T2/de not_active Expired - Lifetime
- 1999-01-12 CA CA002259110A patent/CA2259110C/fr not_active Expired - Lifetime
- 1999-01-13 US US09/229,565 patent/US6079242A/en not_active Expired - Lifetime
- 1999-01-13 BR BR9900047-4A patent/BR9900047A/pt not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
FR2773505A1 (fr) | 1999-07-16 |
US6079242A (en) | 2000-06-27 |
EP0928644A1 (fr) | 1999-07-14 |
CA2259110C (fr) | 2007-05-08 |
BR9900047A (pt) | 2000-01-04 |
CA2259110A1 (fr) | 1999-07-13 |
FR2773505B1 (fr) | 2000-02-25 |
ATE229849T1 (de) | 2003-01-15 |
DE69904513T2 (de) | 2003-09-11 |
DE69904513D1 (de) | 2003-01-30 |
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