EP1035928A1 - Procede et dispositif permettant de laminer une bande d'epaisseur variable - Google Patents

Procede et dispositif permettant de laminer une bande d'epaisseur variable

Info

Publication number
EP1035928A1
EP1035928A1 EP98961045A EP98961045A EP1035928A1 EP 1035928 A1 EP1035928 A1 EP 1035928A1 EP 98961045 A EP98961045 A EP 98961045A EP 98961045 A EP98961045 A EP 98961045A EP 1035928 A1 EP1035928 A1 EP 1035928A1
Authority
EP
European Patent Office
Prior art keywords
wedge
rolling
shaped
roll stand
roll
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Withdrawn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
EP98961045A
Other languages
German (de)
English (en)
Inventor
Wilfried Tautz
Ralph Jonscher
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1035928A1 publication Critical patent/EP1035928A1/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Withdrawn legal-status Critical Current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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/24—Automatic variation of thickness according to a predetermined programme
    • B21B37/26—Automatic variation of thickness according to a predetermined programme for obtaining one strip having successive lengths of different constant thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/20—Slip

Definitions

  • the invention relates to a method and a device for rolling a rolled strip of varying thickness.
  • Continuous rolling leads to changes in thickness of more than 20%, which place high demands on the setting of the rolling mill. Due to the temperature of the rolled strip during hot rolling, there is little scope between the loop and the constriction. This applies all the more if there are jumps in thickness of 50% and more.
  • FIG. 1 shows such a wedge.
  • This wedge is located at a fixed point on the belt and has the predetermined length L WDG . It runs essentially linearly with slightly rounded kinks. The piece of tape in the area of the wedge represents rejects and can be cut out later. Therefore, the smallest possible length of the wedge, ie a quick stitch plan change, is aimed for.
  • the object is achieved according to the invention by a method according to claim 1 or a device for rolling a metal strip (l) in a rolling mill according to claim 8, the rolling mill having at least two rolling stands.
  • the metal strip (1) has at least two partial areas of different thickness, which are connected to one another via a wedge-shaped or approximately wedge-shaped transition piece (2), the rolling speed of a roll stand during the rolling of the wedge-shaped or approximately wedge-shaped transition piece (2) depending on the advance of the rolling stand is adjusted, ie et al is set depending on the advance of the roll stand.
  • the rolling speed of the roll stand when the wedge-shaped or approximately wedge-shaped transition piece (2) is rolled is set as a function of the speed of the metal strip (Des) running out of the roll stand.
  • the rolling speed of the roll stand when rolling the wedge-shaped or approximately wedge-shaped transition piece (2) it, depending on the length of the wedge-shaped or approximately wedge-shaped transition piece (2), the thickness of the metal strip (l) it when it runs out of the Roll stand and the Thickness of the metal strip (l) set when it left the last rolling stand of the rolling mill.
  • the rolling speed of the roll stand when the wedge-shaped or approximately wedge-shaped transition piece (2) is rolled is set as a function of the dynamics of subordinate controls for regulating the roll stand.
  • the roll gap of the roll stand is adjusted as a function of the speed of the metal strip (1) running out of the roll stand when the wedge-shaped or approximately wedge-shaped transition piece (2) is rolled.
  • the rolling gap of the roll stand when rolling the wedge-shaped or approximately wedge-shaped transition piece (2) it, depending on the length of the wedge-shaped or approximately wedge-shaped transition piece (2), the thickness of the metal strip (l) it when it runs out of the Roll stand and the thickness of the metal strip (l) set it as it emerged from the last roll stand of the rolling mill.
  • the roll gap when the wedge-shaped or approximately wedge-shaped transition piece (2) is rolled is set as a function of the dynamics of subordinate regulations for regulating the roll stand.
  • 2 shows a circuit for generating control signals
  • 3 shows a circuit for generating control signals for a five-stand rolling mill
  • FIG. 7 shows a speed correction device for a five-stand rolling mill
  • FIG. 8 shows the integration of an embodiment of the invention in an automation device for a rolling mill.
  • the metal strip (1) 1 shows a metal strip (1) 1 of variable thickness as a result of a change in the pass schedule during rolling.
  • the metal strip (1) 1 has an area 4 with the thickness h * Xj0ld / NS , which the
  • the target thickness corresponds to the old pass schedule and an area 3 corresponds to the thickness h * X (neWjNS , which corresponds to the target exit thickness according to the new pass schedule.
  • the metal strip (1) 1 has a wedge-shaped intermediate piece 2 of length L WDG 2.
  • the control signals WDd, which are generated with a circuit according to FIG. 2, are also specified.
  • V ⁇ T , NS denotes the speed of the metal strip (1) es 1 as it leaves the last stand of the rolling mill.
  • all rolling stands are switched from the old to the new pass schedule in good time. In an exemplary embodiment of the invention, this is done by means of standardized control signals WDG ⁇ r which are assigned to the individual roll stands , the index i denoting the roll stand.
  • the control signals WDG X continuously run through the values from 0 to 1 while the piece of tape provided for the wedge passes the respective frame.
  • the control signal WDG_ results for each roll stand by the integral of the current strip speed v ST / 1 through the length of the wedge L WDG is divided.
  • the length L WDG of the wedge for the respective scaffolding is converted with the target outlet thicknesses h * E / 0 id, i and h * E ⁇ , oid, Ns of the old pass schedule: h 11 * EX, old, if * , resort.
  • Reference numerals 10 and 11 denote dividers, reference numerals 12 a multiplier, reference numerals 13 an integrator, reference numerals 14 a summation point and reference numerals 15 an AND gate.
  • FIG. 3 For an exemplary rolling mill with 5 rolling stands, the generation of the control signals according to FIG. 2 is shown in FIG. 3.
  • the blocks SIG GEN 1 to SIG GEN 5 each contain a circuit according to FIG. 2.
  • the exemplary embodiment according to FIG. 3 must be reduced or expanded accordingly.
  • the wedge control is started by changing the start signal WDG START from 0 to 1 (FIG. 4).
  • This start signal WDGSTART is identical to the start signal WDGS TART , ⁇ for the first scaffold.
  • the belt is tracked from scaffolding to scaffolding.
  • WDG START , 5 for the second, third, fourth and fifth framework result from dead time elements 20, 21, 22, 23, the dead times of which depend on the current belt speeds v s ⁇ , ⁇ , v ST / 2 , v s ⁇ , 3 , v s ⁇ , 4 and the Band lengths L ⁇ , 2 , L 2 , 3 , L 3 , 4 , L 4 , 5 between the stands by means of
  • Dead time calculator 24, 25, 26, 27 can be calculated.
  • the active signal is
  • reference numeral 28 designates an OR gate and reference numeral 29 an AND gate.
  • FIG. 4 The time profiles of the control signals and WDG ACT generated according to FIG. 3 are shown in FIG. 4. This representation assumes a constant speed of the finished strip. Since the signals are plotted over time t, the same signal sequences result in succession for each framework. The extent to which the signals from the individual scaffolds overlap depends on the length of the wedge. A large length of the wedge leads to correspondingly large overlaps, which can also extend over several frames.
  • the current value of the roll gap s ⁇ , ⁇ controlled by the start signal WDG ST ART, I negated by an inverter 40, is stored in a scan holding element 41.
  • the difference to the roll gap setpoint s * ⁇ , new, ⁇ of the new pass schedule - generated by a summation point 44 - is multiplied by the control signal WDG X by means of a multiplier 42 and smoothed by a PTi element 43. That way an additional setpoint ⁇ S * K , WDG, I is calculated for the roll gap, which is added to the current setpoint of the roll gap.
  • equations (4) and (5) are to be used for h EX , x and h E ⁇ , ⁇ .
  • a factor fv h / 1 for the infeed speed becomes, based on equations (6) and (7), after inserting (4) and (5) of the rolled strip on the roll stand i:
  • the advance k SL / 1 is defined as
  • v s ⁇ , ⁇ is the speed of the metal strip (l) es emerging from the roll stand i and v wa ⁇ 2 , ⁇ is the peripheral speed of the work rolls of the roll stand.
  • a block FAC CALC i according to FIG. 6 is advantageously provided for each roll stand.
  • Further input variables of the block are the control signal WDG X and advantageously an adaptation parameter AD SL / 1 .
  • block FAC CALC i is equation (8) as well as the equation
  • k SLf l implemented to calculate a factor fv SL , i.
  • k SL _ is the current advance while the wedge passes through the framework i. It changes from k SLf0ld / i to k SL (neWi .
  • the blocks FAC CALC 1 to FAC CALC 5 are the blocks FAC CALC i according to FIG 6.
  • the input variables 60, 61, 62, 63, 64 in the blocks FAC CALC 1, FAC CALC 2, FAC CALC 3, FAC CALC 4, FAC CALC 5 correspond to the input variables in the block
  • FIG. 7 For a rolling mill with fewer or more than 5 roll stands, FIG. 7 must be reduced or expanded accordingly.
  • the factors fv h , ⁇ and fv SL ⁇ i for controlling the speeds are calculated for each roll stand , linked to one another by linking blocks 50, 51, 52, 53 and smoothed by PT ⁇ elements 54, 55, 56, 57, 58, 59. In this way the factors fv 0 ... fv 5 result .
  • With fv 0 the speeds in front of the first scaffold are pre-controlled.
  • fVi ... fv 5 the roll speeds of the stands 1 ... 5 are pre-controlled.
  • the current speed setpoint is multiplied by the associated factor fvi.
  • the wedge control is designed in an exemplary embodiment of the invention so that there is a constant outlet speed of the strip behind the rolling mill. If the finished strip thickness becomes smaller during the transition from the old to the new pass schedule, the strip speed at the entrance to the rolling mill decreases accordingly. If, on the other hand, a pass schedule changeover is desired in which the speed of the strip increases, a speed-up, ie an increase in speed, of the entire rolling mill can take place at the same time. Then the speed changes of the wedge control and the speed-up overlap. 8 shows the embedding of an advantageous exemplary embodiment of the invention in an automation system of a rolling mill.
  • Reference numeral 72 denotes a wedge control, which represents an exemplary embodiment of the invention.
  • Reference numeral 73 denotes a rolling mill with underlying regulation.
  • Reference numeral 71 denotes an automation system for the rolling mill 73.
  • This automation system 71 gives the rolling mill 73 or its subordinate control setpoints v? or s * for the speed or for the roll gap of the roll stands. For this purpose, it optionally receives information about the status of the rolling process from rolling mill 73. This information flow is not shown in FIG.
  • the automation system 71 receives specifications 74 from a superordinate system 70. In order to correct the actual setpoints for speed and roll gap determined by the automation system 71, the wedge control 72 determines the correction values fVj.
  • the wedge control 72 receives the parameters PAR from the automation system 71. These correspond to the input variables in the circuits according to FIG. 2, FIG. 3, FIG. 5 and FIG. 6, with the exception of the control signal WDGi.
  • Rolling stand i fv S i factor of the roller speed of the rolling stand i due to changes in advance h EX / 1 outlet thickness of the rolling stand ih EY , i inlet thickness of the rolling stand i EX, new, 0 Target thickness in front of the first roll stand according to the new pass schedule

Landscapes

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

Abstract

Procédé permettant de laminer une bande métallique (1) dans un train de laminage comportant au moins deux cages de laminoir. La bande métallique (1) comprend au moins deux zones (3, 4) d'épaisseur différente, reliées par une zone de transition (2) cunéiforme ou sensiblement cunéiforme. Pendant le laminage de ladite zone de transition (2), la vitesse de laminage d'une cage est réglée en fonction de l'avance (KSL,i) de ladite cage.
EP98961045A 1997-11-07 1998-10-26 Procede et dispositif permettant de laminer une bande d'epaisseur variable Withdrawn EP1035928A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19749424 1997-11-07
DE19749424 1997-11-07
PCT/DE1998/003131 WO1999024183A1 (fr) 1997-11-07 1998-10-26 Procede et dispositif permettant de laminer une bande d'epaisseur variable

Publications (1)

Publication Number Publication Date
EP1035928A1 true EP1035928A1 (fr) 2000-09-20

Family

ID=7848045

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98961045A Withdrawn EP1035928A1 (fr) 1997-11-07 1998-10-26 Procede et dispositif permettant de laminer une bande d'epaisseur variable

Country Status (2)

Country Link
EP (1) EP1035928A1 (fr)
WO (1) WO1999024183A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105188972A (zh) * 2013-03-28 2015-12-23 杰富意钢铁株式会社 不均厚钢板的轧制方法以及轧制装置

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19930472A1 (de) * 1999-07-01 2001-01-11 Siemens Ag Verfahren und Einrichtung zum Walzen eines Walzbandes mit variierender Dicke
DE102004022334A1 (de) * 2004-05-06 2005-12-01 Siemens Ag Verfahren zum Walzen eines Walzgutes mit Übergangsbereich
AT500764A1 (de) * 2004-05-19 2006-03-15 Voest Alpine Ind Anlagen Verfahren zur berechnung der geometrischen form von walzgut
EP1893361A1 (fr) * 2005-05-11 2008-03-05 Corus Staal BV Procede et appareil permettant de produire une bande a epaisseur variable
CN104338748B (zh) * 2013-07-24 2016-04-27 宝山钢铁股份有限公司 一种用于变厚度带材轧制的两道次轧制方法
CN104690094B (zh) * 2015-03-20 2017-03-08 北京汽车股份有限公司 一种连续变厚度板的成型方法
CN112605124B (zh) * 2020-11-27 2022-07-05 苏州吉润汽车零部件有限公司 一种连续变截面薄钢板的轧制设备及成型方法
DE102021213566A1 (de) * 2021-11-30 2023-06-01 Sms Group Gmbh Verfahren zum Betreiben einer Walzstraße

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JPS56114513A (en) * 1980-02-16 1981-09-09 Nippon Steel Corp Changing method for thickness of strip during hot rolling work
JPS58135711A (ja) * 1982-02-05 1983-08-12 Toshiba Corp 連続圧延機の制御方法およびその制御装置
JPS59101216A (ja) * 1982-11-30 1984-06-11 Toshiba Corp 圧延機の制御装置
JPS59223109A (ja) * 1983-06-03 1984-12-14 Toshiba Corp 圧下位置制御装置
JPS6033809A (ja) * 1983-08-01 1985-02-21 Kawasaki Steel Corp タンデム圧延機の走間板厚変更時の制御方法
CN1070393C (zh) * 1995-03-03 2001-09-05 株式会社东芝 热轧装置
JP2997634B2 (ja) * 1995-06-08 2000-01-11 株式会社東芝 圧延機制御装置

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See references of WO9924183A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105188972A (zh) * 2013-03-28 2015-12-23 杰富意钢铁株式会社 不均厚钢板的轧制方法以及轧制装置

Also Published As

Publication number Publication date
WO1999024183A1 (fr) 1999-05-20

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