EP3009204A1 - Modelisation de bande metallique dans un laminoir - Google Patents

Modelisation de bande metallique dans un laminoir Download PDF

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Publication number
EP3009204A1
EP3009204A1 EP15188683.5A EP15188683A EP3009204A1 EP 3009204 A1 EP3009204 A1 EP 3009204A1 EP 15188683 A EP15188683 A EP 15188683A EP 3009204 A1 EP3009204 A1 EP 3009204A1
Authority
EP
European Patent Office
Prior art keywords
rolling
metal strip
models
stand
strip
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Withdrawn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
EP15188683.5A
Other languages
German (de)
English (en)
Inventor
Johannes Dr. Gerstmayr
Peter Dr. Gruber
Yury Dr. Vetyukov
Agnes BAUMGÄRTNER
Andreas Lorenz
Bernhard Weisshaar
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.)
Primetals Technologies Germany GmbH
Original Assignee
Primetals Technologies Germany GmbH
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 Primetals Technologies Germany GmbH filed Critical Primetals Technologies Germany GmbH
Publication of EP3009204A1 publication Critical patent/EP3009204A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/12—Length
    • 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
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/04—Front or inlet tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/06—Interstand tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/08—Back or outlet tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/04—Roll speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/06—Product speed
    • 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
    • B21B37/48—Tension control; Compression control
    • 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
    • B21B37/48—Tension control; Compression control
    • B21B37/50—Tension control; Compression control by looper control
    • 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

Definitions

  • the present invention is further based on a computer program comprising machine code executable by a rolling mill controller, wherein the processing of the machine code by the controller causes the controller to operate the mill train according to such an operating method.
  • the present invention is further based on a control device for a rolling train, wherein the control device with such a computer program is programmed, so that the control device operates the rolling mill according to such an operating method.
  • Such an operating method, the associated computer program, the corresponding control device and the rolling train are for example from DE 102 11 623 A1 and the corresponding one US Pat. No. 7,031,797 B2 known.
  • the stability of the strip running through a hot rolling mill is an important prerequisite for the application of a flawless flat product and its dimensional quality.
  • the observation of the tape run is only very limited possible from the control platform.
  • the prior art seeks to supplement the lack of direct insight with video cameras and the like located at appropriate locations.
  • due to emissions such as water, steam, smoke and dust the band behavior is often poorly visible.
  • due to the observation of the local movement of the band often the cause of this movement is not recognizable.
  • the invisible acting on the band forces that lead to an equally invisible distribution of tensile and compressive stresses and shear stresses in the interior of the metal strip, not recognizable.
  • a strained metal band tends to undesirable displacements. This applies in particular to the rear end of the strip (strip foot) during unthreading from the individual rolling stands of the rolling train. In particular, during the unthreading tape should therefore be tension-free. Otherwise, it may lead to a lateral breakout of the tape end or to a so-called high spirits come. In such a case, at least band damage will result. In extreme cases, roll damage can occur due to tape doubling.
  • the front end of the strip (strip head) must continue to hit the respective roll gap from roll stand to roll stand as far as possible, without touching any side guides in the area between each two roll stands.
  • the tape head from the rear stands of the rolling mill already expires very quickly, the lateral movement behavior is difficult for the taxpayers to assess and, above all, requires a rapid response.
  • loops are used in the prior art, which have built-in force measuring systems.
  • the looper provide an average of a longitudinal tensile force in the rolling direction.
  • a differential control unit in the loop lifter With a differential control unit in the loop lifter, a linear tension distribution across the bandwidth can be approximated.
  • a so-called tensiometer With a so-called tensiometer, it is possible to record a plurality of measured train values distributed over the bandwidth.
  • all measuring methods have in common that they provide a voltage image only at a single point of the path coordinate in the strip running direction. For simplicity's sake, it is therefore assumed in the prior art that this image along the metal strip in the strip running direction is the same at every point between two rolling stands.
  • the position of the metal strip between the rolling stands is also not visible everywhere.
  • One reason for this is the relatively large spatial extent of the rolling stands. With line scanners or surface cameras, the tape layers can be visualized at one location or over a limited field of view between the rolling stands and made available as a measured value. However, the extent of the metal strip in the entire area between two rolling stands can not be detected. This shape of the metal strip can be present, for example, as a saber or as a serpentine line.
  • the actuators may include, for example, the hydraulic adjustment, the roll back bending, the axial displacement of work rolls, back-up rolls and / or intermediate rolls, the drive of the rolls and spray nozzles for cooling water and lubricating oil.
  • These scaffold models consist of iteratively calculated partial models for the description of the load roll gap, for example on the basis of the Karman Siebel differential equation, the material flow in the nip, the bending and flattening of the working and the backup rolls, the thermal crowning and the wear development of the work rolls, the sliding influence of Work rolls, which include hydraulic adjustment, the elasticity of the scaffold stand and the drive of the work rolls.
  • the modeling of the load nip based on the assumption of a central band pass with symmetrical load distribution. This allows the restriction of the bill to one half of the nip.
  • the object of the present invention is to provide possibilities on the basis of which a precise description of the actual conditions in the metal strip is possible.
  • the stress states in the metal strip can be determined and displayed with two-dimensional resolution (namely in the strip running direction and in the band width direction). Also, the resulting lateral displacements of the metal strip can be determined and displayed.
  • a loop lifter is often arranged in the area between each two successive rolling stands.
  • the position of each loop lifter is additionally given to the respective band piece models.
  • the respective tape piece models are thereby able to take into account the position of the respective loop lifter in the determination of the new stress states of the area of the metal strip which they model.
  • the roll stand models and the belt piece models are coupled together solely by the tension conditions and profiles supplied to the roll stand models by the belt piece models and the speeds and profiles supplied to the belt piece models by the roll stand models and otherwise independent of each other.
  • the various roll stand models can be calculated simultaneously and, analogously, the different strip piece models can also be calculated simultaneously.
  • the resulting stress states of the sections of the metal strip are visualized color coded to the operator of the rolling train. This results in a particularly good visibility of the resulting stress states for the operator of the rolling mill.
  • the framework data influencing the profile of the roll gap of the respective roll stand preferably comprise, with reference always to the respective roll stand, at least one of the mean setting, differential adjustment between operating side and drive side, roll bending, axial roll displacement, roll grinding, roll wear and thermal profile.
  • material properties, lateral position and profile of the metal strip can be predetermined in front of the rolling stand of the rolling train, which is first passed through by the metal strip.
  • the material properties and the profile of the metal strip in front of the rolling stand of the rolling train, which is first passed through by the metal strip can preferably be specified as functions over the strip length of the metal strip.
  • the object is further achieved by a computer program having the features of claim 8.
  • the execution of the computer program causes the control device to operate the rolling train in accordance with an operating method according to the invention.
  • control device for a rolling train with the features of claim 9.
  • the control device is programmed with a computer program according to the invention, so that the control device operates the rolling train in accordance with an operating method according to the invention.
  • control device operates the rolling train in each case according to an operating method according to the invention.
  • FIG. 1 has a rolling mill for rolling a metal strip 1 a plurality of successive rolling stands 2.
  • the metal band 1 is often a steel band.
  • the metal strip 1 may alternatively be made of a different material, such as aluminum, copper, brass and other metals or metal alloys.
  • the metal strip 1 has - see FIG. 2 - a bandwidth b on. It passes through the rolling train in a strip running direction x.
  • the number of rolling stands 2 is usually between four and eight, in particular, it may be five, six or seven.
  • the rolling stands 2 are hereinafter referred to according to their order in which they are traversed by the metal strip 1, as the first rolling stand 2a, second rolling stand 2b, etc.
  • the metal strip 1 is rolled in the rolling stands 2 of the rolling train successively in several rolling passes.
  • the properties of the metal strip 1 at the entry into the rolling train, that is, before the rolling mill 2 a of the rolling train first passed through by the metal strip 1, can be given.
  • the properties of the metal strip 1 include in particular its material properties and its initial profile. They may be time- or location-dependent (ie varying over the length of the metal strip 1).
  • the properties of the metal strip 1 (including its temperature) in front of the rolling stand 2 a of the rolling train, which is first passed through by the metal strip 1 are given as functions over the strip length of the metal strip 1.
  • a lateral position of the metal strip 1 may be given in front of the rolling stand 2 a of the rolling train, which is first passed through by the metal strip 1.
  • the rolling train has a control device 3.
  • the rolling train is controlled by the control device 3.
  • the control device 3 is programmed with a computer program 4.
  • the computer program 4 comprises machine code 5, which can be processed by the control device 3.
  • the execution of the machine code 5 by the controller 3 causes the controller 3 to operate the rolling mill in accordance with an operating method which will be explained later.
  • the feeding of the computer program 4 to the control device 3 can take place in any desired manner.
  • the computer program 4 can be stored on a mobile data carrier 6 in (exclusively) machine-readable form, for example in electronic form.
  • a strip head 7 initially runs into the first rolling stand 2a of the rolling train, is rolled there and again runs out of the first rolling stand 2a of the rolling train. After that, the following sections of the metal strip 1 enter the first rolling stand 2a of the rolling train on the strip head 7, are rolled there and run out of the first rolling stand 2a of the rolling train again. During this process, the metal strip 1 leaving the first roll stand 2a of the rolling train is initially not yet subjected to an external pull.
  • the tape head 7 enters the second rolling stand 2b of the rolling mill, is rolled there, and again runs out of the second rolling stand 2b of the rolling train. Then the run On the tape head 7 following sections of the metal strip 1 in the second rolling stand 2b of the rolling mill, there are rolled and run again from the second rolling stand 2b of the rolling train.
  • the metal strip 1 issuing from the second roll stand 2b of the rolling train is likewise not yet subjected to an external pull. The metal strip 1 is at this time, however - at least in the rule - not yet fully entered the first rolling stand 2a of the rolling train 2.
  • a strip foot 8 preceding sections and the strip foot 8 enter the first rolling stand 2a of the rolling train, are rolled there and run out of the first rolling stand 2a of the rolling train again.
  • other portions of the metal strip 1 enter the second rolling stand 2b, are rolled there and run out of the second rolling stand 2b of the rolling train again.
  • the metal strip 1 issuing from the first rolling stand 2a of the rolling train is still subjected to an external tension.
  • the draft is reduced as far as possible shortly before the rolling of the strip foot 8 in the first roll stand 2a of the rolling train.
  • the strip foot 8 enters the first rolling stand 2a of the rolling train, where it is rolled and runs out again the first rolling stand 2a of the rolling train.
  • the belt foot 8 of the remaining located between the first and the second roll stand 2a, 2b of the rolling mill area of the metal strip 1 is zuglos.
  • control device 3 models the real processes explained above.
  • the controller 3 implements according to this purpose FIG. 3 For each real rolling stand 2, a respective roll stand model 9 and for each real area behind the respective rolling stand 2, a respective piece piece model 10.
  • the roll stand models 9 and the belt piece models 10 work clocked and coordinated.
  • the behavior of the metal strip 1 during a single working cycle is simulated by means of the roll stand models 9 and the belt piece models 10.
  • the results of the respective subsequent work cycle are determined.
  • the working cycle usually corresponds to a relatively small period of time, in particular with a period of time between 100 milliseconds and 1 second.
  • the power stroke may correspond to a period between 200 milliseconds and 500 milliseconds, in particular about 300 milliseconds.
  • the modeling is carried out in real time with the passage of the real metal strip 1 through the rolling train.
  • the time required for the clocked and coordinated execution of the models 9, 10, ie the period of time which the control device 3 requires, may be determined by means of the models 9, 10 to model the rolling of the metal strip 1 - to be at most as large as the modeled period. Otherwise, if no real coupling with the real rolling mill is required in real time, this time span can be greater.
  • the rolling stand models 9 are each assigned to one of the rolling stands 2 of the rolling train.
  • the rolling of the metal strip 1 in the respective rolling stand 2 is modeled in each case.
  • the band piece models 10 are each assigned to a region between in each case two successive rolling stands 2.
  • the profile and flatness behavior of a region of the metal strip 1 located between the two successive rolling stands 2 is modeled in each case.
  • the transport of the metal strip 1 from the respectively upstream rolling stand 2 - for example the rolling stand 2a - to the respective downstream rolling stand - for example the rolling stand 2b - is further modeled.
  • a flag F is set to the value 0.
  • the purpose of this measure will be explained later in the explanation of FIG. 4 become apparent.
  • a section of the real metal strip 1 enters one of the rolling stands 2.
  • the shrinkage occurs at a rolling speed v.
  • the roll stand 2 is set so that its roll gap 11 (see FIG. 3 ) has a specific profile.
  • the nip 11 can - in addition to the middle position - be influenced by appropriate settings, for example by a segmented cooling or by a back bend.
  • the rolling speed v and the corresponding settings are determined according to FIG. 4 fed to the respective rolling stand model 9 in a step S2.
  • the framework data G supplied to the rolling stand model 9 is the real framework data G corresponding to which the respective rolling stand 2 is set.
  • the rolling speed v is given to the roll stand model 9 usually as a scalar. It can be defined directly as such or alternatively via the peripheral speed of rolls 12 of the respective roll stand 2.
  • the framework data G are those parameters and variables of the modeled rolling stand 2, which influence the respective profile of the roll gap 11 of the corresponding rolling stand 2 with spatial resolution via the bandwidth b.
  • the framework data G can, for example, the drive-side and the operator-side employment of the rolling stand 2 (equivalent: a middle position and a difference between operator side and drive side), the drive-side and the user-side modulus of elasticity of the rolling mill 2, a rolling force, a differential rolling force, a roll bending, a axial roll displacement, a roll grinding, a roller wear, a thermal profile of the work rolls of the roll stand 2 and the like more.
  • the framework data G can - analogous to the properties of the metal strip 1 - time or place dependent (ie over the length the metal strip 1 varying) be predetermined. They correspond in particular when the method according to the invention is carried out in real time, at any time with the actual framework data G, with which the respective rolling stand 2 is operated.
  • profile is sometimes used in the art with different meanings. So profile means the course of the band thickness d from its actual sense of the word - see FIG. 1 over the bandwidth b.
  • the term is used in the prior art not only for the course of the strip thickness d over the bandwidth b, but also in part as a purely scalar measure of the deviation of the strip thickness d at the strip edges of the strip thickness d in the center of the strip.
  • profile is used in the literal sense. This applies both to the profile of the roll gap 11 and for later introduced profiles P, PE, PA.
  • the incoming section has - spatially resolved over the bandwidth b - a profile PE.
  • the spatial resolution over the bandwidth b can be selected as needed. At least, however, at least five values should be defined for the inlet-side profile PE distributed over the bandwidth b. The same applies to other variables introduced later, which are specified or determined spatially resolved over the bandwidth b.
  • the section is also - also spatially resolved over the bandwidth b - the inlet side with a voltage state SE applied.
  • the section is also - also spatially resolved over the bandwidth b - also exposed on the outlet side with a voltage state SA.
  • the rolling stand model 9 are according to the FIG. 4 and 5 the inlet side profile PE and the voltage states SE, SA supplied in a step S3. Both the profile PE and the stress states SE, SA are fed to the rolling stand model 9 in a spatially resolved manner over the bandwidth b. So far required, the rolling stand model 9 in the context of step S3 further data of the incoming portion of the metal strip 1 can be supplied.
  • the rolling stand model 9 determines for the currently rolled section of the metal strip 1-in each case spatially resolved over the strip width b-an inlet-side speed vE, an outlet-side speed vA and an outlet-side profile PA.
  • the corresponding step is in FIG. 4 provided with the reference symbol S4.
  • the profile PA is determined by the shape of the roll gap 11 present in the modeled roll stand 2, that is to say its profile.
  • the forces acting on the metal strip 1 on the inlet side and outlet side also have an influence on the outlet-side profile PA.
  • the roll stand model 9 can be designed such that it can also determine these sizes PA, vA, vE when the metal strip 1 eccentrically enters the modeled rolling stand 2 and / or if the metal strip 1 entering the modeled rolling stand 2 has an asymmetrical profile on the inlet side PE and / or inlet side and / or outlet side has an asymmetric stress state SE, SA. Also, the nip 11 of the modeled rolling stand 2 may be asymmetric.
  • the roll stand model 9 may vary depending on the location of the case. Preferably, however, the roll stand model 9 is constructed as shown in FIG DE 102 11 623 A1 or the corresponding one US Pat. No. 7,031,797 B2 is described in detail.
  • the mode of operation of the roll stand models 9 is in principle the same for each roll stand model 9. Only the input variables, parameters and output variables are individual for the respectively modeled rolling stand 2.
  • step S5 checks whether the flag F has the value 0. Only if this is the case, steps S6 to S9 are executed. Otherwise, steps S6 to S9 are skipped.
  • step S6 the flag F is set to the value 1. This measure causes, in the context of the processing of the in FIG. 4 shown steps S6 to S9 are executed only once.
  • step S7 an average strip thickness dM and an average length IM are determined on the outlet side on the basis of the outlet-side profile PA and the outlet-side speed vA of the section of the metal strip 1, which were determined by the rolling stand model 9 under consideration. The determination is made such that the mass flow law is met.
  • the determined mean strip thickness dM and the determined mean length lM are - see also FIG. 6 -
  • the following band piece model 10 is supplied.
  • the following band piece model 10 accepts the determined mean strip thickness dM and the determined mean length IM in step S8.
  • the following belt piece model 10 already models a region of the metal strip 1, namely that region which is located between the previously considered rolling stand 2 and the roll stand 2 following this rolling stand 2.
  • the following band piece model 10 applies a section to the region of the metal strip 1 modeled by it to the upstream rolling stand 2.
  • the attached section initially has the mean strip thickness dM and the determined mean length IM of step S8.
  • the steps S2 to S4 are performed by the respective rolling stand model 9.
  • the steps S6 and S7 can be performed by the rolling stand model 9 under consideration. Alternatively, they can by the considered Roll stand model 9 downstream band piece model 10 are made.
  • the steps S8 and S9 are performed by the considered rolling mill model 9 downstream band piece model 10. Subsequent steps S10 to S14 are carried out by the strip mill model 10 downstream of the considered rolling stand model 9.
  • the considered band piece model 10 is supplied from the upstream roll stand model 9, the speed vA of the portion of the metal strip 1, which expires in the considered power stroke from the upstream rolling stand 2.
  • the supply is spatially resolved over the bandwidth b.
  • the considered band piece model 10 is supplied from the upstream roll stand model 9, the profile PA, with which the considered portion of the metal strip 1 expires in the considered power stroke from the upstream rolling stand 2. Again, the supply is spatially resolved on the bandwidth b.
  • the belt piece model 10 receives the speed vA and the profile PA in step S10.
  • the tape piece model 10 allocates the profile PA to the corresponding attached portion in step S11.
  • the belt piece model 10 accepts this speed vE in step S12.
  • step S13 the piece of tape piece 10 under consideration shortens the region of the metal strip 1 modeled by it to the respective downstream rolling stand 2.
  • the shortening is spatially resolved over the bandwidth b.
  • the band piece model 10 shortens the region of the metal band 1 which it models by a section proportional to the respective inlet-side speed vE.
  • the piece of tape piece 10 under consideration models the transport of the metal strip 1 from the respective upstream rolling stand 2 to the respective downstream rolling stand 2.
  • the piece of tape piece 10 under consideration also models the profile and flatness behavior of the area of the metal strip 1 which is between the two successive rolling stands 2 is located. This is done in step S14.
  • the band piece model 10 therefore determines from the profiles P and the stress states S, which are assigned to the sections of the area of the metal strip 1-in each case spatially resolved over the bandwidth b-spatially resolved over the bandwidth b and in the strip running direction x new stress states S for the
  • the strip piece model 10 additionally takes into account the speed vA of the section of the metal strip 1 leaving the upstream rolling stand 2 and the speed vE of the section of the metal strip 1 entering the downstream rolling stand 2. This consideration also takes place spatially resolved over the strip width b.
  • the newly determined stress states S assign the band piece model 10 to the sections of the modeled region of the metal band 1. A possible embodiment of the band piece model 10 will be explained later.
  • the section provided in the region of the metal strip 1 modeled by the strip piece model 10 in the course of step S9 initially has a uniform thickness over the strip width b - namely the average thickness dM - and a uniform length. However, the thickness and the length are changed in the subsequent execution of step S11.
  • the region of the metal strip 1 modeled by the band piece model 10 is shortened as a function of the respective inlet-side speed vE. It can happen that ends by shortening the modeled region of the metal strip 1 to the subsequent rolling stand 2 out within a section, so that in a given power stroke, only a portion of this section or parts of two adjacent sections are passed to the subsequent roll stand model 9.
  • the data P, S of the respective section of the metal strip 1 are still stored within the respective piece of tape model 10.
  • the part of the relevant section already transferred to the following roll stand model 9 is no longer taken into consideration by the belt piece model 10.
  • the section from the modeling by the relevant piece model 10 is removed. Due to the fact that the transfer to the following roll stand model 9 is carried out in a spatially resolved manner over the strip width b, it can also vary spatially resolved over the strip width b, to what extent a respective section is already transferred to the following roll stand model 9.
  • longitudinal displacements of the sections can continue to result.
  • the longitudinal displacements can be spatially resolved over the bandwidth b from each other.
  • the shortening is proportional to the respective inlet side speed vE, it can thus happen that the part of the relevant section transferred to the following roll stand model 9 varies over the bandwidth b, ie is not the same everywhere.
  • flatness comprises, from its literal sense, initially only the visible distortions of the metal strip 1, if this is not subjected to external stresses.
  • the term is often used in the art but also as a synonym for the prevailing in the metal strip 1 internal stresses. In the context of the present invention, it depends on the internal stresses in the metal strip 1. It is therefore always spoken in the context of the present invention to avoid ambiguity of voltages or voltage states. This means the mechanical tensile and compressive conditions in the metal strip 1 are meant.
  • the mode of operation of the band piece models 10 is - analogous to the roll stand models 9 - in principle the same for each band piece model 10. Only the input variables, parameters and output variables are individual for the respective modeled region of the metal strip 1.
  • a step S15 the control device 3 checks whether a convergence results.
  • the control device 3 can in particular check whether the outlet-side profiles PA determined in step S4 and the speeds vA, VE determined in step S4 have not changed or have changed only slightly compared to the previous iteration.
  • the control device 3 can check whether the profiles P and stress states S ascertained in step S14 have not changed or only slightly changed in comparison to the previous iteration.
  • step S16 the respective band piece model 10 again restores, at the region of the metal band 1 modeled by it, to the respective downstream rolling stand 2 precisely that section by which it has shortened the area in step S13. As a result, step S13 is thus undone in step S16. Then, the controller 3 returns to step S3 and executes the next iteration.
  • step S17 the respective band piece model 10 determines the lateral position of the metal band 1 on the basis of the states of stress S assigned to the sections of the respectively modeled region of the metal band 1. The determination is carried out with local resolution in the strip running direction x.
  • a step S18 the control device 3 visualizes an operator 13 of the rolling train (see FIG. 1 ) the lateral position of the metal strip 1 spatially resolved in the tape running direction x. Purely by way of example, this is in FIG. 7 shown.
  • the vertical lines in FIG. 7 should indicate the locations of the rolling stands 2.
  • the control device 3 visualizes the operator 13 in step S18 with spatial resolution over the bandwidth b and in the strip running direction x the resulting stress states S of the metal strip 1.
  • the visualization can in particular be color-coded. This is in FIG. 7 indicated by a representation in different gray levels.
  • step S19 the control device 3 uses the determined lateral position and / or the determined stress states S in the course of determining the framework data G affecting the profiles of the roll nips 11 of the rolling stands 2 determined framework data G is usually in the next working cycle.
  • the rolling mill model 9 and the band piece model 10 perform certain steps. Strictly speaking, the steps are each carried out by the control device 3, but in the context of the execution of the respective model 9, 10. In particular, the control device 3 therefore also executes the steps S1, S5 and S15 to S19.
  • the tape piece model 10 includes according to FIG. 8 - Of course, in the appropriate order - a sequence of sections of the metal strip 1, namely those portions of the metal strip 1, which have already expired at the respective time from the respective preceding rolling stand 2, but not yet run into the subsequent roll stand 2. Each of these sections are - spatially resolved over the bandwidth b - each associated with the profile P and the stress state S.
  • the number of sections modeled within the respective tape piece model 10 may be determined as needed. However, there are always several sections included. In most cases, the number of sections is at least five.
  • the band piece models 10 use the data PA, vA of the newly set sections of the metal band 1 and the profiles P and the stress states S of the previously modeled sections to model new stress states S for all the modeled sections, including the newly added section. However, the portion by which the modeled area of the metal strip 1 has been shortened in step S13 is not considered here.
  • the modeling is carried out spatially resolved over the bandwidth b and in the tape running direction x.
  • the spatial resolution over the bandwidth b is the same as the spatial resolution over the bandwidth b of the rolling mill models 9.
  • the spatial resolution in the strip running direction x usually corresponds to the sections as they are recognized by the respective band piece model 10. However, an exception applies, as already explained, for the last section adjacent to the following roll stand model.
  • step S13 it may happen that, based on the sections as generated in step S9, when shortening in step S13, 10 sections remain in the respective band piece model and, moreover, the extent to which the sections remain varies in a spatially resolved manner over the bandwidth b.
  • the determination of the new stress states S by the respective band piece model 10 can be carried out, for example, as will be explained in more detail below.
  • the sections are according to FIG. 8 due to the spatial resolution over the bandwidth b in cells 14 divided.
  • the cells 14 correspond to finite elements.
  • Each cell 14 is assigned a respective initial length which the respective cell 14 would have in the de-energized state.
  • respective lengths are determined for the cells 14 of the sections. The determination of the resulting lengths takes place taking into account a transverse coupling QK of the cells 14 with each other and taking into account a longitudinal coupling LK of the cells 14 with each other. Furthermore, it is believed that the resulting distortions are elastic.
  • the transverse coupling QK results from the shear modulus of the metal strip 1.
  • the longitudinal coupling LK results from the modulus of elasticity of the metal strip 1.
  • the elastic modulus and the shear modulus are generally uniform at least for the respective section. They can also be uniform for groups of sections, for example, for each located between two stands 2 sections.
  • the stress state S of the respective cell 14 is also fixed at the same time. It results from the difference between the initial and the resulting length of the respective cell 14 and the modulus of elasticity of the respective cell 14.
  • boundary conditions continue to be taken into account.
  • the considered piece of the metal strip 1 contains the tape head 7 and the tape head 7 has consequently not yet entered the subsequent roll stand 2
  • This boundary condition defines in particular the page position of this section.
  • boundary conditions that the section which has just run out of the preceding rolling stand 2 adjoins the preceding rolling stand 2 and the section which has just entered the following rolling stand 2 adjoins the preceding rolling stand 2 adjacent roll stand 2 adjacent.
  • these boundary conditions define the lateral position of the sections adjoining the two adjacent rolling stands 2 and, on the other hand, define a resultant tensile stress, which is exerted on the modeled area of the metal strip 1 via the two rolling stands 2.
  • each a loop lifter 15 is arranged.
  • the position s of the respective loop lifter 15 also influences the resulting tensile stress, which is exerted on the modeled region of the metal strip 1 via the two rolling stands 2.
  • the position s of the respective loop lifter 15 is additionally given to the respective band piece model 10.
  • the respective band piece model 10 takes into account the position s of the corresponding loop lifter 15 when determining the new stress states S of the area of the metal band 1 which they model.
  • the strip piece model 10 receives boundary conditions for the adjacent section from the upstream rolling stand model 9, in particular the exact side position of this section and FIGS outlet speed vA of this section.
  • the piece of strip piece 10 receives boundary conditions for the adjacent section from the downstream rolling stand model 9, in particular the exact side position of this section and the inlet side speed vE of this section.
  • the respective band piece model 10 "remembers" the last determined solution for the next working cycle and uses this as an initial approach in the next working cycle.
  • the determination of the lateral position of the metal strip 1 can be carried out by the control device 3 alternatively in the context of processing the band piece models 10 or independently thereof.
  • the displacement of the metal strip 1 in the direction of the bandwidth b is determined spatially resolved in the strip running direction x.
  • an average length and a resulting length wedge can be determined on the basis of the resulting lengths of the cells 14 of the respective section. Therefore, in simple terms, sizes for the respective section which define a trapezoid whose parallel sides are formed by the outer edges of the considered section of the metal strip 1 result. These trapezoids can be attached to one another, so that the course of the respective region of the metal strip 1 modeled by the respective band piece model 10 results.
  • the integration of the modeling by the roll stand models 9 and the belt piece models 10 in the operation of the rolling train can be done in various ways.
  • the modeling is carried out in parallel to the ongoing operation of the rolling train.
  • the modeling is carried out in synchronism with the passage of the real metal strip 1 through the rolling line. It is thus carried out during the rolling of the sections of the metal strip 1 in the rolling stands 2.
  • the sections of the metal strip 1 modeled in the rolling stand models 9 are thus at any time those sections of the metal strip 1 which are assigned to the real sections of the metal strip 1 that are currently being rolled in the rolling stands 2.
  • the sections of the metal strip 1 modeled in the strip piece models 10 are at all times those sections of the metal strip 1 which are assigned to the real sections of the metal strip 1 which are currently located in the respective gap between two rolling stands 2.
  • the frame sizes G are in this case either detected actual data of the rolling stands 2 or their nominal values, as used by the control device 3 for controlling the rolling stands 2.
  • the specification of the properties of the metal strip 1 in front of the first rolling stand 2a of the rolling train can in this case be based on a measurement or a model-based calculation.
  • the control device 3 As an alternative to modeling parallel to the ongoing operation of the rolling train, it is also possible for the control device 3 according to FIG. 1 to supply a desired profile P * and / or a nominal stress state S * of the metal strip 1, to carry out the modeling and the profile PA resulting behind the last roll stand 2 of the rolling train and / or the stress state SA resulting behind the last rolling stand 2 of the rolling train with the corresponding one Setpoints P *, S * to compare. If too large deviations occur, the framework data G of the rolling stands 2 are varied, so that the deviations are reduced. This process is repeated until the deviations are within the permitted range. With the framework data G thus determined, the rolling stands 2 are then activated during rolling of the metal strip 1.
  • the modeling must either be carried out completely in advance or be completed for each section of the metal strip 1 before rolling of the corresponding section of the metal strip 1 in the first rolling stand 2a of the rolling train.
  • the framework data G influence the profiles of the roll nips 11 of the rolling stands 2. Again, the specification of the properties of the metal strip 1 before the first roll stand 2a of the rolling train based on a measurement or a model-based calculation.
  • the tape head 7 it is also possible to determine the framework data G of the rolling stands 2 in an analogous manner such that the tape head 7 enters the respective next rolling stand 2 in a defined manner. It is also possible with respect to the belt foot 8 to determine the framework data G of the rolling stands 2 in such a way that the belt foot 8 deflects as little as possible when leaving one of the rolling stands 2. In these two cases, therefore, the lateral position of the metal strip 1 is taken into account in the determination of the framework data G. Also in In this case, the corresponding framework data G influence the profiles of the roll nips 11 of the rolling stands 2.
  • the present invention has many advantages.
  • it is possible to model the real behavior of the metal strip 1 almost perfectly and to derive quantities based on the modeled results that are not metrologically detectable in the real rolling process.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
EP15188683.5A 2014-10-13 2015-10-07 Modelisation de bande metallique dans un laminoir Withdrawn EP3009204A1 (fr)

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CN114441540A (zh) * 2020-11-05 2022-05-06 普锐特冶金技术日本有限公司 缺陷判断装置及缺陷判断方法
US11938528B2 (en) 2018-07-19 2024-03-26 Sms Group Gmbh Method for ascertaining control variables for active profile and flatness control elements for a rolling stand and profile and average flatness values for hot-rolled metal strip

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US11938528B2 (en) 2018-07-19 2024-03-26 Sms Group Gmbh Method for ascertaining control variables for active profile and flatness control elements for a rolling stand and profile and average flatness values for hot-rolled metal strip
CN114441540A (zh) * 2020-11-05 2022-05-06 普锐特冶金技术日本有限公司 缺陷判断装置及缺陷判断方法

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