EP0764064A1 - Regulation du profil d'une bande metallique - Google Patents

Regulation du profil d'une bande metallique

Info

Publication number
EP0764064A1
EP0764064A1 EP95921901A EP95921901A EP0764064A1 EP 0764064 A1 EP0764064 A1 EP 0764064A1 EP 95921901 A EP95921901 A EP 95921901A EP 95921901 A EP95921901 A EP 95921901A EP 0764064 A1 EP0764064 A1 EP 0764064A1
Authority
EP
European Patent Office
Prior art keywords
profile
strip
stand
mill
error
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.)
Withdrawn
Application number
EP95921901A
Other languages
German (de)
English (en)
Inventor
John Beattie Robert
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.)
Davy Mckee Poole Ltd
Original Assignee
Davy Mckee Poole 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 Davy Mckee Poole Ltd filed Critical Davy Mckee Poole Ltd
Publication of EP0764064A1 publication Critical patent/EP0764064A1/fr
Withdrawn legal-status Critical Current

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
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2267/00—Roll parameters
    • B21B2267/18—Roll crown; roll profile
    • B21B2267/19—Thermal crown
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2269/00—Roll bending or shifting
    • B21B2269/02—Roll bending; vertical bending of rolls
    • B21B2269/04—Work roll bending

Definitions

  • This invention relates to the rolling of metal strip, particularly the hot rolling of steel and the hot and warm rolling of aluminium strip.
  • Cold strip mills have sophisticated gauge and shape control systems giving excellent performance but strip profile is essentially fixed during the preceding hot rolling of the strip.
  • action has to be taken during the hot rolling of steel and the hot and warm rolling of aluminium strip.
  • a tandem hot rolling mill for metal strip is provided with a profile control system whereby the strip profile exiting the mill is detected, is compared with a desired profile to provide an error, and the individual mill stand roll gap profiles are adjusted in the sense to reduce the error substantially to zero.
  • a hot rolling reversing mill for strip material is provided with a profile control system whereby the profile of the strip exiting the mill on each pass is detected, is compared with a desired profile for that pass to provide an error and the profile of the mill roll gap is adjusted in the sense to reduce the error substantially to zero prior to the next pass.
  • the roll gap profile of the mill stand of the reversing mill and the individual mill stand roll gap - -> - profiles in the tandem mill are adjusted for example by means of work roll bending, spray control, axial work roll shifting and by using Dynamic Shape Rolls.
  • the exiting strip profile is determined by a profile gauge located at the mill exit.
  • the gauge is conveniently a nucleonic or X-ray profile gauge which with its associated circuitry produces both a numerical value of, and tffe form of, the profile of the exiting strip.
  • the profile control system always acts to control the roll bending, spray control and any other actuators on each stand in the sense to reduce the numerical value of the profile error to zero. Conveniently it also actuates a special spray control or other actuator on each stand or pass when the profile is found to be one of an undesirable form which requires special action with respect to the thermal camber or other roll properties to correct the profile.
  • Figure 1 is a diagrammatic view of a profile control system applied to a tandem mill.
  • Figure 2 shows various alternative strip profile forms.
  • Figure 3 shows alternative spray patterns.
  • the strip Downstream of stand S 3 the strip is coiled in a coiler (not shown) and between the stand S 3 and the coiler there is a profile gauge G.
  • the gauge G is a nucleonic or X-ray profile gauge which measures the gauge of the strip, at a plurality of regions spaced apart across the width of the strip, and at regular time intervals.
  • the gauge forms part of a closed loop profile control system which functions to keep the exit strip profile as measured by the gauge at a selected target profile.
  • This system measures the profile of the strip exiting from the tandem mill, subtracts the measured profile from a target profile to generate a profile error and employs the error to change the rolling conditions in each stand of the tandem mill in the sense to reduce the error.
  • the conditions which can be changed in each stand are work roll bending and the coolant spray pattern. Work roll bending brings about a fast acting response and coolant spray pattern is a slower response because it depends on the build up or decay of the work roll thermal camber.
  • Signals from the gauge G are processed in its own signal processor and processed further within the closed loop system signal processor H and the profile and form of the strip are passed to a profile strategist K.
  • a signal representing the target profile is also supplied to the profile strategist K.
  • the strategist K the measured profile is subtracted from the profile target to produce the profile error and the numerical profile error is supplied to the Stand Target Determination Device L.
  • the profile error is converted into three roll gap corrections, one for each mill stand, and these are supplied to respective Roll Gap Controllers RGC/S1 - RGC/S3 _ _ associated with the mill stands.
  • Each Roll Gap Controller comprises a supervisory controller and subsidiary controllers for roll bending and for spray control.
  • the form of the profile is also detected and is classified into one or other of the two groups of profile forms shown in Figure 2.
  • the "acceptable" profile forms shown on the lefthand side of figure 2 are parabolic parabolic edge drop edge drop flat.
  • the profile strategist determines the kind of spray control - _ - which is required. If the form of the profile is one of the "acceptable" types then instructions are sent to the Roll Gap controllers RGC to employ nominal spray control. This selects a spray pattern within the range of specified maximum and minimum spray patterns as shown in figure 3 (a) and 3(c). If the profile is one of the undesirable types the Roll Gap controllers are instructed direct by v/ay of the routes shown by broken lines to take exceptional spray action. For example, if the inverse parabolic or inverse edge drop forms are detected then it is necessary to decrease the roll thermal cambers. In this case the spray patterns would be set immediately to their maximum patterns. If incremental spray patterns are required these can be provided. For example, with an edge drop profile the sprays can be increased near the edge of the strip to reduce the load locally and hence the edge drop effect. Similarly, particular spray patterns may be selected to counter asymmetric profile forms.
  • Shape measuring devices R it is desirable, but not essential, for Shape measuring devices R to be provided at the exit of each mill stand. Changes to the rolling conditions in each stand can lead to undesirable changes in the shape of the strip. Consequently the purpose of the shape measuring devices R is to monitor the strip for bad shape and to control the stands to improve the profile only to an extent which does not bring about unacceptably bad shape.
  • the outputs from the devices R are supplied to the Profile Strategist K and in the event of bad shape being detected the Profile Strategist instructs the stand or stands concerned on what action is required.
  • the profile error determined by the strategist K is supplied to the Stand target determinator L where the individual roll gap corrections for each of the stands S-_ S 3 are determined. Since profile change in a stand is a function of H/b where H is the strip entry gauge and b is the strip width, then more profile change can be made on stand S- ⁇ than on stand S 2 and more on stand S 2 than on stand S 3 so the stand target determinator L functions to keep the roll gap changes on each stand in the ratio of the stand's ability to make profile changes, i.e. most profile change on stand 1 and least on stand 3 and the appropriate corrections are passed to the roll gap controllers.
  • K ⁇ * is the equivalent entry profile to stand i
  • the X ratio of stand i is defined as
  • f ⁇ is the shape change coefficient for stand i and is a function of the strip width b) and strip thickness H in the stand
  • the Stand Target Determination (L) operates to satisfy the following two constraints -
  • the Roll Gap Controllers RGC are responsible for converting the corrections from the determinator L into a bend correction and a spray pattern correction. They take into account the composition of the material being rolled and determine a roll bend correction which will produce the required change in the roll gap profile and a correction in the thermal camber of the rolls which will change the roll gap profile.
  • the controller tries to achieve the full correction required on both roll bending and spray control.
  • the response times for the two corrections are very different.
  • the roll bend system acts very quickly, while the thermal camber can only be changed slowly.
  • the instructions to the roll spray controllers are overruled if the form of. the profile of the strip is of the undesirable type. In this case the calculated change in thermal camber is ignored and special spray action is taken.
  • each roll gap controller Given a desired roll gap correction each roll gap controller first calculates the required bend correction to reduce the error, it outputs this correction to the roll bending system via the roll gap bend controller. Changes to individual stand bend settings are sequenced according to the current transport delay from stand 1.
  • the roll gap spray controller compares the actual roll bending value with a preferred roll bending value which is a value which permits both positive and negative bend changes to be made as and when necessary. If the actual bend value is greater than the preferred bend value then the roll gap spray controller tries to increase the thermal camber (by decreasing the spray pattern) with the aim of allowing lower bend values to be used. On the other hand, if the actual bend value is less than the preferred bend value then the roll gap spray controller will try to decrease the thermal camber with the aim of allowing higher bend values to be used. To avoid "hunting" of the sprays, each time the controller outputs a new spray pattern that pattern is retained for a predetermined time before it is changed.

Landscapes

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

Abstract

Dans un laminoir à chaud ou à semi-chaud destiné au laminage d'une bande métallique, un système de régulation de profil (G) détecte le profil de la bande sortant du laminoir et le compare à un profil requis afin de produire un profil d'erreur, et les profils de serrage du ou des montants du laminoir (S1-S3) sont ajustés de façon à ramener le profil d'erreur à un niveau sensiblement nul.
EP95921901A 1994-06-13 1995-06-09 Regulation du profil d'une bande metallique Withdrawn EP0764064A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9411820A GB9411820D0 (en) 1994-06-13 1994-06-13 Strip profile control
GB9411820 1994-06-13
PCT/GB1995/001354 WO1995034388A1 (fr) 1994-06-13 1995-06-09 Regulation du profil d'une bande metallique

Publications (1)

Publication Number Publication Date
EP0764064A1 true EP0764064A1 (fr) 1997-03-26

Family

ID=10756654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95921901A Withdrawn EP0764064A1 (fr) 1994-06-13 1995-06-09 Regulation du profil d'une bande metallique

Country Status (4)

Country Link
EP (1) EP0764064A1 (fr)
JP (1) JPH10501465A (fr)
GB (1) GB9411820D0 (fr)
WO (1) WO1995034388A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE19625442B4 (de) * 1996-06-26 2005-02-03 Siemens Ag Verfahren und Einrichtung zur Verringerung der Kantenanschärfung eines Walzbandes
JP2000033411A (ja) * 1998-07-21 2000-02-02 Toshiba Corp 圧延における遺伝係数の測定装置
DE19851554C2 (de) * 1998-11-09 2001-02-01 Siemens Ag Verfahren und Einrichtung zur Voreinstellung einer Walzstraße
DE10112716A1 (de) * 2001-03-16 2002-09-19 Sms Demag Ag Verfahren und Anlage zum Herstellen von metallischem Warmband aus gegossenem Dünnband
US7849722B2 (en) 2006-03-08 2010-12-14 Nucor Corporation Method and plant for integrated monitoring and control of strip flatness and strip profile
US8205474B2 (en) * 2006-03-08 2012-06-26 Nucor Corporation Method and plant for integrated monitoring and control of strip flatness and strip profile
RU2690580C2 (ru) 2015-03-16 2019-06-04 Смс Груп Гмбх Способ изготовления металлических полос
CN113316491B (zh) 2019-01-28 2023-08-11 首要金属科技德国有限责任公司 在将轧件在轧制机架中热轧成所轧制的带材的期间工作辊的工作面的有效轮廓的改变
CN110193708B (zh) * 2019-05-31 2020-11-10 中国电子科技集团公司第三十九研究所 超大直径多段式齿圈加工方法
EP3943210A1 (fr) * 2020-07-23 2022-01-26 Primetals Technologies Austria GmbH Installation composite de coulée et de laminage destinée à la fabrication d'une bande finie laminée à chaud à partir d'un acier fondu
CN113182362B (zh) * 2021-04-01 2022-07-08 本钢板材股份有限公司 一种高平直度冷轧带钢的生产方法

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US3213655A (en) * 1962-12-03 1965-10-26 Westinghouse Electric Corp Workpiece shape control apparatus
JPS5345178B2 (fr) * 1974-06-01 1978-12-05
EP0121148B1 (fr) * 1983-03-14 1989-02-15 Sms Schloemann-Siemag Aktiengesellschaft Procédé pour la fabrication de feuillard à chaud avec section et planéité de bande de haute qualité
JPS60240320A (ja) * 1984-05-14 1985-11-29 Mitsubishi Electric Corp 可逆式圧延機における形状修正装置の初期設定方法
JPH0626723B2 (ja) * 1986-09-24 1994-04-13 三菱電機株式会社 板材の形状制御方法
JPH04313410A (ja) * 1991-04-11 1992-11-05 Nippon Steel Corp 帯鋼のプロフィール自動認識制御装置
JPH0815610B2 (ja) * 1991-10-07 1996-02-21 住友軽金属工業株式会社 熱間タンデムミルにおける板形状・板クラウン制御方法及び装置
DE4309986A1 (de) * 1993-03-29 1994-10-06 Schloemann Siemag Ag Verfahren und Vorrichtung zum Walzen eines Walzbandes

Non-Patent Citations (1)

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Title
See references of WO9534388A1 *

Also Published As

Publication number Publication date
JPH10501465A (ja) 1998-02-10
WO1995034388A1 (fr) 1995-12-21
GB9411820D0 (en) 1994-08-03

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