EP2957360A1 - Procédé de fonctionnement d'un train de laminoir - Google Patents

Procédé de fonctionnement d'un train de laminoir Download PDF

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Publication number
EP2957360A1
EP2957360A1 EP14172541.6A EP14172541A EP2957360A1 EP 2957360 A1 EP2957360 A1 EP 2957360A1 EP 14172541 A EP14172541 A EP 14172541A EP 2957360 A1 EP2957360 A1 EP 2957360A1
Authority
EP
European Patent Office
Prior art keywords
rolling
stand
temperature
operating method
stock
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Withdrawn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
EP14172541.6A
Other languages
German (de)
English (en)
Inventor
Bernhard Weisshaar
Agnes BAUMGÄRTNER
Andreas Lorenz
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
Priority to EP14172541.6A priority Critical patent/EP2957360A1/fr
Publication of EP2957360A1 publication Critical patent/EP2957360A1/fr
Withdrawn legal-status Critical Current

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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
    • B21B37/28—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
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/68—Camber or steering control for strip, sheets or plates, e.g. preventing meandering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B21B2261/21—Temperature profile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2263/00—Shape of product
    • B21B2263/02—Profile, e.g. of plate, hot strip, sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2271/00—Mill stand parameters
    • B21B2271/02—Roll gap, screw-down position, draft position
    • B21B2271/025—Tapered roll gap
    • 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
    • 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
    • B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature

Definitions

  • the invention relates to an operating method for a rolling train for rolling a flat rolling stock in at least one rolling stand of the rolling train.
  • the invention relates to a computer program comprising machine code, which can be derived directly from an arithmetic unit for a rolling train for rolling a flat rolling stock and whose processing by the arithmetic unit causes the arithmetic unit to operate the rolling mill according to the operating method.
  • the invention relates to a computer program product, on which such a computer program is stored, such a computing unit and a rolling mill for rolling a flat rolling stock, wherein the rolling train is equipped with such a computing unit.
  • Such an operating method or such devices are for example from the WO 2012/159849 A1 are known and used in particular when hot rolling a metal strip used.
  • the surface and thus usually also the core temperature falls from one strip edge to the other before entry into the finishing train, this is referred to as an incoming temperature wedge over the strip width.
  • the temperature asymmetry can arise due to the influence of false air in the slab heating furnace on the side of the oven door. If such a band with a rectangular thickness contour runs centrally into a horizontal nip, this results in a trapezoidal, ie wedge-shaped, thickness contour and a saber-shaped band course after the first frame. This happens because of the temperature-dependent material strength, which leads to an asymmetric framework expansion and thus to an asymmetric thickness reduction leads. If, however, a rectangular thickness contour is to be obtained, the adjustment over the bandwidth must be asymmetrical. For this purpose, the roll gap on the colder side must be made stronger by an amount to be determined in order to achieve the desired reduction there.
  • the invention has for its object to provide a way to reduce or prevent a caused by rolling wedging or saberiness.
  • this object is achieved by the aforementioned computer program in that it comprises machine code, which can be derived directly from an arithmetic unit for a rolling train for rolling a flat rolling stock and whose processing by the arithmetic unit causes the arithmetic unit to operate the rolling mill in accordance with the proposed operating method.
  • this object is achieved by the above-mentioned arithmetic unit in that the arithmetic unit is designed such that the rolling train is operable by means of the arithmetic unit according to the proposed operating method.
  • the flat rolling stock is, for example, a metal strip or hot rolled strip.
  • the distance along the width coordinate between the drive and the operating side is to be understood in particular as a distance between the two-sided Anstellzylindern the respective rolling mill.
  • the desired size of the difference between the inlet thickness and the outlet thickness corresponds to the predetermined nominal thickness reduction of the rolling stock with respect to the respective rolling stand.
  • the respective scaffolding module describes, for example, the rigidity of the respective rolling stand.
  • the line material rigidity of the rolling stock considered in the width direction characterizes the rigidity of the rolling stock in the direction of the width coordinate, which points essentially in the direction of the axis of rotation of a respective work roll of the respective rolling stand.
  • a temperature wedge across the width results in a broad dependent material strength.
  • the material On the side of the deeper Temperature, the material is harder and expands the nip further than on the higher temperature side. This results in a wedge-shaped outlet thickness profile of the band and thus also a band saber.
  • the nip must therefore be narrowed by the natural expansion difference on one side. This results in unequal expansion as a result of a rectangular thickness profile, so that the band remains straight in the outlet and there is no wedge or saber formation.
  • the consideration of the respective temperature wedge allows, for example, together with a feedforward, to derive an adjustment correction.
  • the manipulated variable of the feedforward control of the temperature wedge over the bandwidth acts directly and in such a way on the pivoting of the respective roll stand, that the strip continues to run straight on the frame exit as far as possible and a wedge formation or a saber formation is reduced or avoided.
  • the pivoting according to the determined employment difference must take place contrary to the otherwise expected, wedge-shaped expansion of the roll gap.
  • the arithmetic unit can be embodied as a control computer or basic automation of the respective rolling stand or rolling train.
  • the arithmetic unit can additionally be supplied with a width of the rolling stock.
  • the determined employment difference can be regarded as a correction of a pass plan.
  • the determination of the employment difference is preferably made online in the arithmetic unit associated with the level 1.
  • the passplan calculation is carried out in the level 2 of the automation, wherein the pass schedule is calculated before the rolling process and still assumes a rectangular nip.
  • the respective temperature wedge is determined by measurement before the respective rolling stand and / or in the opening band.
  • the respective temperature wedge for example, an optical sensor or a camera, in particular a thermal imaging camera, can be used.
  • the respective temperature wedge can be detected, for example, by means of a respective scanner or a temperature-sensitive transducer over the entire width of the rolling stock.
  • the scanner is arranged at the exit of the roughing train or at the entrance of the finishing train.
  • the respective sensor is preferably designed such that even comparatively fast-moving bands can be detected correctly at belt speeds of, for example, up to 20 m / s and any temperature wedges that can be detected can be determined.
  • the respective sensor can be wired or wirelessly connected to the arithmetic unit.
  • the respective temperature wedge is preferably determined metrologically for each of the rolling mills in front of the respective rolling stand.
  • the rolling train in this case at least a first rolling stand and a second rolling stand arranged behind the second rolling stand, wherein a first temperature wedge is determined by measurement before the first rolling stand, wherein a transport model is provided, wherein by means of the transport model under consideration of the determined first temperature wedge, a second temperature wedge is determined before the second rolling stand.
  • the respective temperature wedge metrologically before each the rolling stands it is advantageous if the first temperature wedge is determined by measurement.
  • the second temperature wedge and optionally the respective temperature wedges of subsequent rolling stands can then be determined by means of the transport model. This makes it possible to prevent saber formation or wedge formation for each of the rolling mills of the rolling train.
  • the transport model allows a band-correct assignment, so that, for example, material properties of each band can be assigned to the right band.
  • a memory unit is provided on which, for example, the data of up to three bands can be stored.
  • such a storage unit is used for a transport route between the roughing train and the finishing train when the temperature scanner is located directly behind the roughing train.
  • the term derivative is used herein in the sense of differentiation, so that a derivation of a first physical quantity according to a second physical quantity corresponds to a differentiation of the first physical quantity with respect to the second physical quantity.
  • the arithmetic unit, the three mentioned derivatives are supplied, so that the arithmetic unit from the line material stiffness in the direction of the latitude coordinate for the rolling stock before the respective rolling stand can determine.
  • Such a determination of the line material stiffness is relatively easy to perform and also provides very reliable values.
  • the respective temperature wedge can be determined metrologically or by means of a transport model.
  • the derivation of the material modulus according to the modulus of elasticity of steel, the derivation of the modulus of elasticity of steel according to the temperature and / or the respective temperature wedge by means of a respective slope of a respective regression line are taken into account.
  • a table is used to determine the derivative of the modulus of elasticity of steel according to the temperature, in which a relationship between the modulus of elasticity of steel and the temperature is stored, with a corresponding elasticity function as a function of temperature determined and after Temperature is derived.
  • the table allows a comparatively simple determination of the derivation of the modulus of elasticity of steel according to the temperature, since the table requires comparatively little storage space and thus nevertheless sufficiently accurate and reliable results are achievable.
  • the elasticity function is determined, which is a good approximation to the real elasticity function.
  • the desired derivative is available.
  • the following table shows the relationship between the modulus of elasticity, in short modulus of elasticity, of steel and the temperature as an example. Temperature [° C] Modulus of elasticity [10 9 N / m 2 ] 20 2.10 200 1.98 400 1.81 600 1.60 800 1.25 900 0.99 1000 0.61 1100 0.32
  • the arithmetic unit is further supplied to a derivative of the respective outlet thickness on the latitudinal coordinate.
  • the derivation of the respective outlet thickness according to the width coordinate indicates the wedging or saberiness of the expiring rolling stock after the respective rolling stand.
  • the additional consideration of the derivation of the respective outlet thickness on the latitudinal coordinate allows a kind of feedback, whereby the determination of the Anstelldifferenz can be made more precise and reliable. In particular, this makes it possible to reduce or minimize the wedging or saberiness of the rolling stock leaving the respective rolling stand in a particularly strong or particularly reliable manner.
  • the derivative of the respective outlet thickness can be measured by the width coordinate detected and finally fed to the arithmetic unit.
  • the derivative of the respective outlet thickness is determined by the latitude by a summation of a first summand with a second summand, the first summand is equal to a derivation of Leerwalzspalt Escape the respective rolling mill on the latitudinal coordinate, the second addend equal is the reciprocal of the scaffold module multiplied by a derivative of a rolling force of the respective rolling mill to the latitude coordinate.
  • This summation is obtained by deriving the skeletal equation, according to which the outlet thickness is equal to the summation of the Leerwalzspaltt Too and the quotient of the rolling force and the scaffold module, according to the latitude coordinate.
  • the derivation of the rolling force of the respective roll stand according to the width coordinate can be understood as a line rolling force along the roll gap.
  • the arithmetic unit is further supplied to a derivation of a rolling force of the respective rolling mill on the latitudinal coordinate.
  • the derivation of the rolling force of the respective roll stand according to the width coordinate can be understood as a line rolling force along the roll gap.
  • the derivation of the rolling force of the respective roll stand according to the width coordinate can be determined by measurement in order to make the determination of the setting difference ⁇ s more precise and reliable.
  • the derivation of the respective rolling force is determined by the width coordinate by a derivative of a product of a first factor and a second factor on the latitudinal coordinate, wherein the first factor is equal to a material module of the rolling stock before the respective rolling mill multiplied by two and wherein the second factor is equal to the difference between the inlet thickness and the outlet thickness.
  • the product can be derived for example from an approximated equation of material which is used in particular during cold rolling and which states that the temperature-dependent material modulus is equal to the temperature-dependent rolling force of the respective rolling stand divided by twice the difference between the inlet thickness and the outlet thickness.
  • a derivative of the material module according to the latitude coordinate and a derivative of the difference between the inlet thickness and the outlet thickness on the latitudinal coordinate.
  • the derivation of the material module according to the latitude coordinate can be determined for example by measurement or by means of models.
  • the determination of the derivative of the difference between the inlet thickness and the outlet thickness according to the latitude coordinate can be performed, for example, based on measurement data.
  • FIG. 1 shows a schematic representation of a first embodiment of a rolling mill according to the invention for rolling a flat rolling stock 1.
  • the rolling mill has a rolling stand 2 with two rollers 9, in which the rolling stock 1 in Walzgutlaufraum x enters.
  • the rolling train is equipped with a computing unit 3, for example a control computer.
  • the arithmetic unit 3 is designed such that it operates the rolling train according to an operating method with all the steps of an operating method according to the invention.
  • the operating method according to the invention will be explained in more detail below.
  • the corresponding design of the arithmetic unit 3 is effected by a computer program 4, with which the arithmetic unit 3 is programmed.
  • the computer program 4 can for this purpose on a suitable data carrier 5, purely by way of example is the data carrier in FIG. 1 stored as a USB memory stick.
  • the storage on the data carrier 5 is in machine-readable form, as a rule in an exclusively machine-readable form, for example in electronic form.
  • the computer program 4 comprises machine code 6.
  • the machine code 6 can be processed directly by the arithmetic unit 3.
  • the execution of the machine code 6 by the arithmetic unit 3 causes the arithmetic unit 3 to operate the rolling mill in accordance with the proposed method of operation.
  • the arithmetic unit 3 is a temperature wedge ⁇ T in front of the roll stand 2, a distance L along a width coordinate y between a drive and an operating side of the roll stand 2, a target size .DELTA.H is a difference between an inlet thickness H of the incoming rolling stock 1 and an outlet thickness h of the expiring rolling stock 1, a respective scaffold module c G of the rolling stand 2 and with respect to the latitudinal coordinate y considered line material stiffness c M, y of the rolling stock 1 fed in front of the rolling stand 2.
  • the arithmetic unit 3 taking into account the variables supplied to it, determines such an employment difference ⁇ s between the drive side and the operating side of the rolling stand 2 that a wedging K or a saberiness K 'of the rolling stock 1 expiring from the rolling stand is reduced or is substantially equal to zero, wherein the rolling stock 1 is rolled in the rolling stand 2 in accordance with the determined employment difference ⁇ s.
  • the temperature wedge ⁇ T can be detected, for example, by means of a sensor arranged in front of the roll stand 2, which sensor is arranged in particular as a scanner at the entrance of the roughing train or the finishing train.
  • the sensor is designed as a temperature-sensitive transducer, by means of which the temperature distribution over the entire width b of the rolling stock 1 can be detected.
  • FIG. 2 shows a portion of a flat rolling stock 1.
  • the rolling stock has a width b along a width coordinate y between a drive and an operating side of the respective rolling stand 2.
  • FIG. 3 shows a schematic representation of a second embodiment of a rolling mill according to the invention for rolling the rolling stock 1.
  • the rolling train is designed as a multi-stand rolling train having a plurality, usually four to eight, rolling stands 2, 2a, 2b.
  • rolling stands 2, 2 a, 2 b of the rolling train the flat rolled stock 1 is rolled similarly as shown in the first embodiment.
  • the proposed method is carried out for each of the rolling stands 2, 2a, 2b, so that a respective pitch difference ⁇ s, a, ⁇ s, b or ⁇ s is determined for each of the rolling stands 2, 2a, 2b and according to this respective pitch difference ⁇ s, a , ⁇ s, b or ⁇ s is rolled.
  • respective inlet thicknesses Ha, Hb, H and respective outlet thicknesses ha, hb, h and corresponding desired sizes are used for this purpose for the respective rolling stand 2, 2a, 2b.
  • corresponding temperature wedges ⁇ Ta, ⁇ Tb or ⁇ T and, if appropriate, respective line material stiffnesses c M, y or scaffold modules c G can be used.
  • a sensor explained in connection with the first exemplary embodiment may be used, by means of which the temperature distribution over the entire width b of the rolling stock 1 can be detected.
  • a sensor in the rolling stock running direction x in front of the respective rolling stand 2, 2a, 2b, such a sensor may be arranged, it being alternatively also possible to arrange such a sensor only in front of the first rolling stand 2a.
  • a first temperature key ⁇ Ta can be determined in front of the first rolling stand 2a.
  • a second temperature wedge ⁇ Tb can be determined taking into account the determined first temperature wedge ⁇ Ta.
  • FIG. 4 shows an exemplary flowchart of the operating method according to the invention, in addition FIG. 1 or FIG. 3 are to be used.
  • a respective temperature wedge ⁇ T is supplied to a computing unit 3 in front of a respective rolling stand 2.
  • the respective temperature wedge ⁇ T is determined by means of a respective sensor or by means of a sensor and a transport model, as explained above.
  • the arithmetic unit 3 is supplied with a distance L along a width coordinate y between a drive side and an operating side of the respective rolling stand 2.
  • arithmetic unit 3 is supplied with a target value ⁇ H soll of a difference between an inlet thickness H of the incoming rolling stock 1 and an outlet thickness h of the outgoing rolling stock with respect to the respective rolling stand 2.
  • a step S4 the arithmetic unit 3 is supplied with a respective scaffolding module c G of the respective rolling stand 2.
  • a step S5 the arithmetic unit 3 is supplied with a line material stiffness c M, y of the rolling stock 1 in relation to the width coordinate y in front of the respective rolling stand 2.
  • the arithmetic unit 3 taking into account the quantities supplied to it, determines such an employment difference ⁇ s of the respective rolling stand 2 that a wedging K or a saberiness K 'of the rolling stock 1 expiring from the respective rolling stand 2 is reduced or substantially equal to zero ,
  • a step S7 the rolling stock 1 is rolled in the respective rolling stand 2 in accordance with the respectively determined employment difference ⁇ s.
  • step S5 of the calculation of the respective employment difference ⁇ s by the arithmetic unit 3 Before the step S5 of the calculation of the respective employment difference ⁇ s by the arithmetic unit 3, a further step or further steps according to the advantageous embodiments of the invention explained above can be provided.
  • the invention relates to an operating method for a rolling mill for rolling a flat rolled material in at least one rolling stand of the rolling train. Furthermore, the invention relates to a computer program comprising machine code, which can be derived directly from an arithmetic unit for a rolling train for rolling a flat rolling stock and whose processing by the arithmetic unit causes the arithmetic unit to operate the rolling mill according to the operating method. Furthermore, the invention relates to a computer program product, on which such a computer program is stored, such a computing unit and a rolling mill for rolling a flat rolling stock, wherein the rolling train is equipped with such a computing unit.
  • the computer program thereby comprises machine code which can be derived directly from a processing unit for a rolling mill for rolling a flat rolling stock and whose processing by the arithmetic unit causes the arithmetic unit to operate the rolling mill in accordance with the proposed operating method.
  • the proposed computer program be stored on the computer program product.
  • the arithmetic unit be designed such that the rolling train can be operated by means of the arithmetic unit in accordance with the proposed operating method.
  • the rolling mill is equipped with the proposed computing unit.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
EP14172541.6A 2014-06-16 2014-06-16 Procédé de fonctionnement d'un train de laminoir Withdrawn EP2957360A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14172541.6A EP2957360A1 (fr) 2014-06-16 2014-06-16 Procédé de fonctionnement d'un train de laminoir

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14172541.6A EP2957360A1 (fr) 2014-06-16 2014-06-16 Procédé de fonctionnement d'un train de laminoir

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EP2957360A1 true EP2957360A1 (fr) 2015-12-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015108553A1 (de) * 2015-05-29 2016-12-01 Schott Ag Verfahren und Vorrichtungen zur Reduzierung der Säbeligkeit bei Dünngläsern
CN111266419A (zh) * 2020-02-27 2020-06-12 北京首钢股份有限公司 一种卷取入口侧导板预设开口度的控制方法及控制装置
WO2022226460A1 (fr) * 2021-04-20 2022-10-27 Novelis, Inc. Systèmes et procédés de commande de direction de rouleau pour des laminoirs tandem

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6277110A (ja) * 1985-09-30 1987-04-09 Kawasaki Steel Corp 熱間圧延鋼板の寸法及び形状矯正設備
DE102004041328A1 (de) * 2004-08-26 2006-03-02 Alstom Verfahren zum Betreiben eines Walzgerüsts eines Walzwerks
WO2006063948A1 (fr) * 2004-12-15 2006-06-22 Siemens Aktiengesellschaft Procede de fonctionnement pour un train de laminoir et dispositifs correspondants
WO2012159849A1 (fr) 2011-05-24 2012-11-29 Siemens Aktiengesellschaft Procédé permettant de faire fonctionner un train de laminoir

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6277110A (ja) * 1985-09-30 1987-04-09 Kawasaki Steel Corp 熱間圧延鋼板の寸法及び形状矯正設備
DE102004041328A1 (de) * 2004-08-26 2006-03-02 Alstom Verfahren zum Betreiben eines Walzgerüsts eines Walzwerks
WO2006063948A1 (fr) * 2004-12-15 2006-06-22 Siemens Aktiengesellschaft Procede de fonctionnement pour un train de laminoir et dispositifs correspondants
WO2012159849A1 (fr) 2011-05-24 2012-11-29 Siemens Aktiengesellschaft Procédé permettant de faire fonctionner un train de laminoir

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015108553A1 (de) * 2015-05-29 2016-12-01 Schott Ag Verfahren und Vorrichtungen zur Reduzierung der Säbeligkeit bei Dünngläsern
DE102015108553B4 (de) 2015-05-29 2019-02-14 Schott Ag Verfahren und Vorrichtungen zur Reduzierung der Säbeligkeit bei Dünngläsern
CN111266419A (zh) * 2020-02-27 2020-06-12 北京首钢股份有限公司 一种卷取入口侧导板预设开口度的控制方法及控制装置
WO2022226460A1 (fr) * 2021-04-20 2022-10-27 Novelis, Inc. Systèmes et procédés de commande de direction de rouleau pour des laminoirs tandem

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