EP2873469A1 - Procédé de fonctionnement pour une voie de refroidissement - Google Patents

Procédé de fonctionnement pour une voie de refroidissement Download PDF

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Publication number
EP2873469A1
EP2873469A1 EP20130193234 EP13193234A EP2873469A1 EP 2873469 A1 EP2873469 A1 EP 2873469A1 EP 20130193234 EP20130193234 EP 20130193234 EP 13193234 A EP13193234 A EP 13193234A EP 2873469 A1 EP2873469 A1 EP 2873469A1
Authority
EP
European Patent Office
Prior art keywords
cooling
rolling stock
section
operating method
point
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Withdrawn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
EP20130193234
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German (de)
English (en)
Inventor
Klaus Weinzierl
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=49641529&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2873469(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP20130193234 priority Critical patent/EP2873469A1/fr
Priority to EP14802607.3A priority patent/EP3071343B1/fr
Priority to KR1020167016485A priority patent/KR20160089435A/ko
Priority to US15/037,619 priority patent/US20160288181A1/en
Priority to PCT/EP2014/074112 priority patent/WO2015071200A1/fr
Priority to CN201480063121.9A priority patent/CN106061637B/zh
Publication of EP2873469A1 publication Critical patent/EP2873469A1/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Withdrawn legal-status Critical Current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
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B21B37/76—Cooling control on the run-out table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • 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
    • 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
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product

Definitions

  • the present invention further relates to a computer program comprising machine code which can be executed by a control device for a cooling line, wherein the processing of the machine code by the control device causes the control device to operate the cooling section according to such an operating method.
  • the present invention further relates to a control device for a cooling section, wherein the control device is programmed with such a computer program.
  • the flat rolling stock In the production of flat rolled metal usually takes place after rolling in a finishing mill usually cooling in a cooling section. In the cooling section, the flat rolling stock is cooled in a predetermined manner.
  • the cooling influences in particular the material properties of the flat rolling stock. To achieve particularly favorable material properties, it is in many cases not sufficient to set only one temperature at the outlet of the cooling section. In many cases, a precisely defined course of the temperature (or the enthalpy or another variable that is characteristic of the energy content) must be adhered to.
  • the flat rolling stock may for example be a metal strip, in particular a steel strip. Alternatively, it may be a plate.
  • the cooling section has a plurality of individually controllable cooling devices via which the rolling stock is exposed to a coolant (usually a liquid coolant, usually water or water with additives).
  • a coolant usually a liquid coolant, usually water or water with additives.
  • only the top of the rolling stock is acted upon by the cooling means with the coolant.
  • the top side is acted upon by a first part of the cooling devices and the coolant is applied to the underside of the rolling stock via a second part of the cooling devices.
  • the cooling devices may be continuously adjustable or provided with on-off valves.
  • a method for cooling a heavy plate wherein by means of cooling, a predetermined target state of the heavy plate is set at the exit of the cooling section or behind it.
  • a targeted division of the applied coolant quantity is made in a subset applied from above and from below onto the heavy plate.
  • Certain steels have particularly strict requirements for the temporal cooling process. They must be partially cooled to relatively low temperatures. At temperatures below about 350 ° C, however, the vapor film, which normally separates the coolant from the surface of the rolling stock, collapses. As a result, the heat transfer from the rolling stock to the coolant is highly nonlinear. The process is difficult to model causes a significantly uneven cooling in particular between the top and bottom of the rolling stock and sometimes even leads to plastic deformation of the cooled rolling stock. This negatively affects the quality of the rolling stock.
  • the object of the present invention is to provide possibilities by means of which an improved operation of the cooling section is possible.
  • the division of the cooling devices into shared and non-released cooling devices can be done as needed. For example, cooling devices can not be released because they are defective and / or because they are too close to the initial location. In principle, however, an arbitrary blocking (i.e., non-release) of cooling devices is possible and conceivable.
  • the share of shared cooling devices can be up to 100% of the cooling devices in extreme cases, so that all cooling devices are released.
  • cooling capacities applied by these cooling devices are indeed taken into account within the framework of the development of the state of the rolling stock point.
  • the cooling performance of these cooling devices are not in the frame the procedure according to the invention, but otherwise determined.
  • the cooling capacities of these cooling devices are taken for granted.
  • the actual size and the target size may be temperatures in particular.
  • the state of the rolling stock point comprises at least one energy quantity.
  • the energy quantity may be, for example, the enthalpy or the temperature.
  • the energy size can be a scalar. In general, however, it will be a distribution at least in the thickness direction of the rolling stock.
  • the selected Walzguttician in addition to the energy quantity further, the state of the respective section of the rolling stock descriptive variables can be assigned. In this case, the other sizes are taken into account in carrying out the steps following the picking of the rolling stock point. Examples of such variables may in particular be the phase components of the respective section of the rolling stock.
  • the cooling capacities may be characteristic, for example, for an absolute or relative coolant quantity or for a relative valve opening position of the respective cooling device.
  • the model may comprise a heat equation with or without a coupled phase transformation equation.
  • the power stroke of the path tracking is usually 100 ms to 500 ms. In particular, it can be at about 250 ms to 300 ms.
  • the picking out (including the steps following the picking out) for each Walzgut Vietnamese.
  • the number of rolling stock points, for which then the actual cooling powers are determined equal to 1, namely the corresponding Walzgut Vietnamese itself.
  • the determination of the actual cooling performance is further reduced to the Direct assumption of the final cooling performance as actual cooling performance.
  • the actual cooling performance is reduced to the direct assumption of the final cooling performance as actual cooling performance in this case as well.
  • the other rolling stock points ie for those rolling stock points that lie between two directly successive picked out virtual rolling stock points
  • different approaches are possible.
  • the picking out of the later selected virtual rolling stock point and the execution of the calculations relating to this virtual rolling point point are completed before the sections of the rolling stock corresponding to the unmolded rolling point points reach the effective range of the next released cooling device starting from the starting point.
  • the cooling devices usually acts on the upper side of the rolling stock.
  • the cooling curves for the cooling devices acting on the upper side of the rolling stock preferably coincide with one another.
  • another part of the cooling devices acts on the underside of the rolling stock.
  • the cooling curves for the cooling devices acting on the underside of the rolling stock preferably coincide with one another.
  • each part of the cooling means acts on the top and the bottom of the rolling stock and the respective cooling curves for the top coincide with each other and the respective cooling curves for the bottom match with each other
  • the cooling curves for on the cooling devices acting on the upper side of the rolling stock on the one hand and the cooling curves for the cooling devices acting on the underside of the rolling stock coincide with one another, that is to say a total of only one cooling curve uniform for all cooling devices is used.
  • the cooling devices acting on the upper side of the rolling stock on the one hand and for the cooling devices acting on the underside of the rolling stock on the other hand to each have their own cooling curve, which, however, are different from one another.
  • the overall cooling function can be scaled and / or offset with a factor.
  • the offset may be vectorial, i. have a shift in the abscissa and / or a shift in the ordinate.
  • the starting location can be determined as needed. In particular, it can be located in front of the cooling section or in the cooling section. It is also possible that a temperature measuring point is arranged at the start, by means of which a temperature of corresponding section of the rolling stock is detected. In this case, the state of the rolling stock point at the initial location is preferably determined on the basis of the detected temperature.
  • An arrangement of a temperature measuring station at the starting location is possible in particular when the starting point is in front of the cooling section.
  • the temperature measuring station can be, for example, the so-called finishing street measuring station, at which the final rolling temperature of the rolling stock is detected.
  • the destination can also be determined as needed. It can be located in particular in the cooling section or behind the cooling section. However, it must be seen in the transport direction of the rolling stock - of course - lie behind the initial location.
  • the cooling devices often have considerable delay times.
  • the delay times can be in the range of several seconds.
  • the delay times of the cooling devices are preferably taken into account. This leads advantageously to the result that during the transport of the sections of the rolling stock through the cooling section, the cooling means time correct according to the corresponding Walzgut Vietnamese cooling performance.
  • the cooling devices should preferably be actuated in good time beforehand. However, the control can only take place when the corresponding cooling capacity for the respective cooling device is determined.
  • the steps following the selection of the respective rolling stock point are completed at a time of completion.
  • the corresponding section of the real rolling stock reaches, starting from the initial location, the effective range of the next released cooling device at a cooling start time.
  • the model can gradually be approximated better and better to the real behavior of the cooling.
  • the operating method according to the invention based on the extension of the cooling section, is used once within the cooling section.
  • the operating method based on the extent of the cooling section, is applied several times in respective areas of the cooling section.
  • Such an approach may be particularly advantageous if a so-called dual-phase steel to be cooled.
  • the initial location of the local rear area is in this case, seen in the transport direction of the rolling stock behind the destination of the local front area.
  • the processing of the machine code by the control device causes the control device to carry out an operating method according to the invention, as explained above.
  • control device for a cooling section with the features of claim 19.
  • control device is programmed with a computer program according to the invention.
  • the object is further achieved by a cooling section for cooling a flat rolling stock with the features of claim 20.
  • the cooling section has a control device according to the invention which operates the cooling section according to an operating method according to the invention.
  • the flat rolling stock 1 is made of metal. It may be as shown in FIG. 1 for example, be a metal strip, in particular a steel strip. Alternatively, you can the flat rolled stock 1 is a heavy plate (usually made of steel).
  • the cooling section 2 is usually downstream of a finishing train, in which the rolling stock 1 was hot rolled.
  • the finishing train usually has several rolling stands. In FIG. 1 For the sake of clarity, only the last rolling stand 3 of the finishing train is shown. Similarly, it is possible that the finishing train has only a single rolling mill, for example, designed as Steckel rolling mill or as a reversing mill.
  • a temperature measuring station 4 is often arranged, at which a temperature T of the rolling stock 1 is detected.
  • the temperature measuring station 4 is referred to below as the distinction of another, later introduced temperature measuring station as an input-side temperature measuring station 4.
  • the cooling section 2 has a plurality of transport rollers 5.
  • the rolling stock 1 is transported through the cooling section 2.
  • At least some of the transport rollers 5 are driven.
  • the transport rollers 5 in their entirety form a transport device, from which the rolling stock 1 is transported through the cooling section 2 in a transport direction with a transport speed v.
  • the cooling section 2 also has a plurality of cooling devices 6, 7.
  • the rolling stock 1 (or more precisely, the section of the strip located in the effective area 8, 9 of the respective cooling device 6, 7 at this time Rolled material 1) is acted upon by a respective amount of coolant of a liquid, mostly water-based coolant 10.
  • the cooling section 2 also has a control device 11. Under control and control by the controller 11, the cooling section 2 is operated.
  • the control device 11 is usually programmed with a computer program 12.
  • the computer program 12 can be supplied to the control device 11, for example via a data carrier 13, on which the computer program 12 is stored in machine-readable form (preferably in an exclusively machine-readable form, in particular in electronic form).
  • the data carrier 13 can be configured as desired.
  • FIG. 1 in which the data carrier 13 is shown as a USB memory stick, is purely exemplary.
  • the computer program 12 comprises machine code 14, which can be processed by the control device 11.
  • the execution of the machine code 14 by the control device 11 causes the control device 11 to operate the cooling section 2 according to an operating method which will be explained in more detail below.
  • the (real) rolling stock 1 within the control device 11 is subdivided into a plurality of sections 15 in terms of data technology.
  • the sections 15 of the rolling stock 1 is assigned a Walzgutddling P each.
  • the rolling stock points P are - in contrast to the sections 15 of the real rolling stock 1 - only virtually present in the control device 11. They represent in their entirety a data-technical image of the real rolling stock 1.
  • the rolling stock points P are in FIG. 2 supplemented by a number. This indexing is used to distinguish the rolling stock points P in the context of the explanation of the invention, if necessary from each other. Unless it matters below which rolling stock point P is meant, the reference character P is used without the addition of a number.
  • sections 15 of the real rolling stock 1 and virtual rolling stock points P is consistently maintained in the following description. If the sections 15 is mentioned, the sections 15 of the real rolling stock 1 are always and without exception meant. If the Walzgutretericken P is mentioned, is always and without exception, the data-technical image of the sections 15 meant.
  • the division into released and non-released cooling devices 6, 7 is disjunctive in each case and in the FIGS Usually also complementary. Each cooling device 6, 7 is thus either enabled or disabled.
  • cooling devices 6, 7 are released cooling devices. Alternatively, some of the cooling devices 6, 7 may be locked. The blocking of cooling devices 6, 7 can be done as needed. For example, cooling devices 6, 7 may be disabled because they are defective and / or because they are too close to an initial location xA. In principle, however, an arbitrary blocking of cooling devices 6, 7 is possible and conceivable.
  • Step S2 the control device 11 determines final cooling powers mi at least for some of the rolling stock points P (selected rolling stock points P).
  • Step S1 will be described below in connection with FIGS FIG. 4 and 6 be explained in more detail.
  • the index i stands for the cooling capacities mi for the number of the respective released cooling device 6, 7 in the order in which the respective released cooling device 6, 7 is achieved by the respective section 15 of the rolling stock 1.
  • step S3 the control device 11 determines actual cooling capacities mi for a number of rolling stock points P. For the determination of the actual cooling powers mi, the control device 11 uses the final cooling powers mi determined for the selected rolling stock points P. The actual cooling performance mi assigns the control device 11 to the corresponding rolling stock points P assigned to the respective released cooling device 6, 7. Possible embodiments of step S3 will be described below in connection with FIGS FIGS. 7 and 8 be explained in more detail.
  • the rolling stock 1 is transported through the cooling section 2. Due to the transport of the rolling stock 1 as a whole through the cooling section 2, the sections 15 of the rolling stock 1 successively pass through the effective areas 8, 9 of the cooling devices 6, 7. It is possible that as shown in FIG. 3 the transport device 5 is controlled by the control device 11 in a step S4. Alternatively, it is possible that the transport device 5 is controlled by another, not shown in the FIG controller.
  • the control device 11 performs in a step S5 a tracking of the sections 15 of the rolling stock 1 by.
  • the control device 11 is therefore known at any time, which portion 15 of the rolling stock 1 is in the active area 8, 9 which cooling device 6, 7 is located.
  • the control device 11 controls according to FIG. 3 in a step S6, the cooling means 6, 7.
  • the control is such that by means of the released cooling means 6, 7 of the active area 8, 9 of the respective released cooling device 6, 7 located portion 15 of the rolling stock 1 is acted upon by the respective actual cooling power mi which has been determined for the respective section 15 for the respective released cooling device 6, 7.
  • the control device 11 further implements a so-called observer in a step S7.
  • the control device 11 continuously calculates a state E in real time, at least for these sections 15.
  • the state E comprises at least one energy quantity.
  • the energy quantity may be, for example, the enthalpy or the temperature.
  • the energy size can be a scalar. As a rule, however, it will be a distribution of the energy quantity at least in the thickness direction z of the rolling stock 1.
  • the state E may also include further, the Walzgutticianen P associated variables.
  • the control device 11 takes into account (of course) the activation of the cooling devices 6, 7 during the determination.
  • the calculation takes place using a model 16 (see FIG FIG. 1 ).
  • the model 16 is based on mathematical-physical equations.
  • the control device 11 generally dissolves at least one heat conduction equation.
  • a phase transformation equation can be solved.
  • the heat conduction equation may in particular be the Fourier heat equation, see for example the DE 101 29 565 A1 .
  • the phase transformation equation can be used in particular as a so-called Stefan problem.
  • Steps S5 and S7 will continue to be discussed later FIG. 12 be explained in more detail.
  • the steps S2 to S7 are in FIG. 3 shown sequentially one after the other. With regard to the steps S4 to S6 (or S7) this is also the case in fact. These steps (ie steps S4 to S6 or S7) are executed cyclically with a working cycle ⁇ t '.
  • the working clock ⁇ t ' is usually between 100 ms and 500 ms, for example at 250 ms to 300 ms.
  • the step S2 can also be carried out cyclically with the working cycle ⁇ t '.
  • a processing under detachment from the working cycle ⁇ t 'parallel to the steps S4 to S6 (or S7) is possible. This will become apparent from the following explanations.
  • step S3 is coupled to the step S2. If the step S2 is executed cyclically with the working cycle ⁇ t ', this is also the case in step S3. If the step S2 is executed in parallel to the steps S4 to S6 (or S7), this is also the case in step S3. Again, this will be apparent from the following explanations.
  • FIG. 4 is from the controller 11 in a step S11 one of the Walzguta P - for example, the in FIG. 2 P1 marked Walzguttician - singled out.
  • the following explanations to FIG. 4 refer exclusively to this one Walzgut Vietnamese P, so the picked Walzgut Vietnamese P, unless expressly stated otherwise.
  • a state E is determined by the control device 11, which has the section 15 of the rolling stock 1 corresponding to the selected rolled material point P at an initial location xA of the cooling section 2.
  • the determined state E is assigned to the selected rolling stock point P in step S12.
  • the initial location xA can be as shown in FIG. 1 lie in front of the cooling section 2.
  • the initial location xA may be at the location of the input-side temperature measuring station 4, so that the input-side temperature measuring station 4 is arranged at the initial location xA.
  • the temperature measuring station 4 By means of the temperature measuring station 4, as in connection with FIG. 1 already mentioned, for the respective temperature measuring station 4 continuous section 15 whose current temperature T detected.
  • the state E is determined in step S12, preferably based on the temperature T detected for the relevant section 15.
  • the controller 11 is further provided with a travel diagram 17 (see FIG FIG. 1 ) known.
  • the travel diagram 17 indicates what speed vE is expected for the selected rolling stock point P at which simulation time t (calculated from the starting location xA). It is possible that the travel diagram 17 is based on assumptions and expectations, so that a speed vE expected on the basis of the travel diagram 17 generally coincides, but not necessarily, with the later actual transport speed v of the corresponding real section 15 of the rolling stock 1 must apply. Alternatively, it is possible for the travel diagram 17 to be based on a prediction of the transport speed v, which is also maintained with certainty or at least almost certainly later. Procedures for reliable prediction of transport speed v are known to those skilled in the art. It will be especially on the WO 2011/138 067 A2 directed.
  • a total coolant quantity is determined by the control device 11 on the basis of a given overall cooling function F1.
  • the total cooling function F1 describes a cooling required to cool the corresponding section 15 in such a way, an actual size I of the relevant section 15 at a destination xZ (see FIG FIG. 1 ) has a target size EZ.
  • the actual size I can be, for example, the temperature of the relevant section 15. However, it is in any case a quantity that can be determined on the basis of the state Z of the relevant section 15.
  • the total cooling function F1 is a trivial function, ie independent of the state E of the selected one Walzgutins P at the starting point xA.
  • the total amount of coolant may be equal to the total amount of coolant that was determined in the previous execution of step S20 (see there).
  • the total cooling function F1 depends on the state E of the selected rolling stock point P at the initial location xA.
  • the total quantity of coolant with which the corresponding section 15 of the rolling stock 1 is to be acted upon in total by means of the cooling devices 6, 7 is established by inserting the state E determined in step S 12 (or a variable determined by state E, for example a surface temperature of the rolling stock 1 or an average temperature of the rolling stock 1) determined in the total cooling function F1.
  • the determined total amount of coolant is - regardless of the nature of their determination - the selected Walzgut Vietnamese P assigned in step S14 as residual refrigerant amount M.
  • the overall cooling function F1 of the control device 11 is fixed, for example in the context of the computer program 12.
  • the total cooling function F1 of the controller 11 is known in other ways, for example by default or parameterization by a (in the FIG not shown) operator.
  • step S15 the control device 11 mathematically simulates the transport of the rolling stock point P through the cooling section 2. For this purpose, in step S15 the control device 11 sets the current location x of the selected rolling stock point P equal to the initial location xA, the simulation time t to the value 0
  • step S16 the controller 11 continues to write the current location x of the picked rolling point P using the travel diagram 17 and a temporal increment ⁇ t. The simulation time t also continues using the time increment ⁇ t.
  • the temporal step size ⁇ t can be determined as needed. For example, it can be in the range of a few milliseconds. Under certain circumstances, the time increment ⁇ t be variable.
  • the temporal step size ⁇ t in regions of the cooling section 2 in which the rolling stock point P is not in the active region 8, 9 of one of the cooling devices 6, 7 can be selected to be greater than in regions of the cooling section 2 in which the rolling point point P is in the effective range 8, 9 one of the cooling devices 6, 7 is located.
  • step S17 the controller 11 calculates by means of the model 16 the time evolution of the state E of the considered rolling stock point P with. If the considered rolling stock point P is within the scope of the respective execution of step S17 in the active area 8, 9 of the released cooling devices 6, 7, the control device 11 further determines a final coolant quantity mi for the corresponding cooling device 6 within the framework of the respective execution of step S17 , 7.
  • a possible embodiment of the step S17 will be later in connection with FIG. 6 be explained in more detail.
  • step S18 the control device 11 checks whether the target location xZ has been reached in the course of the simulation. As long as this is not the case, the controller 11 returns to step S16. Otherwise, the controller 11 proceeds to a step S19.
  • step S19 the controller 11 determines the actual size I. The determination is carried out using the now determined based on the repeated processing of step S17 state E of the picked Walzgutins P. Furthermore, the controller 11 compares the determined actual size I with the predetermined target size EZ in step S19 , In particular, the control device 11 usually determines the deviation .DELTA.E between the now determined actual size I and the target size EZ. In a step S20, the control device 11 adjusts the overall cooling function F1 on the basis of the comparison-as a rule based on the deviation ⁇ E.
  • step S11 With regard to the rolling stock point P selected in step S11, the procedure of FIG. 4 completed. The procedure of FIG. 4 will however - see the loop in FIG. 3 - Repeatedly, in each case another Walzgut Vietnamese P is picked out. As part of the next execution of the procedure of FIG. 4 In the execution of step S14, the total cooling function F1 adapted in the previous execution of step S20 is assumed.
  • FIG. 6 checks the controller 11 in a step S21, whether the current location x, to which the transport of the picked Walzgutins P was simulated, the effective range 8, 9 one of the cooling devices 6, 7 corresponds.
  • step S22 the control device 11 checks whether the current location x, up to which the transport of the selected rolling stock point P was simulated, corresponds to the effective area 8 of one of the released upper cooling devices 6.
  • step S23 the controller 11 determines based on the then current state E of the picked out Walzgutins P a preliminary cooling power mi for the corresponding approved upper cooling device 6.
  • the determination is carried out using a - preferably smooth - cooling curve F2, which is associated with the respective upper cooling device 6.
  • the preliminary cooling power mi is always greater than 0. At least it is not less than 0. The value 0 itself is therefore still allowed.
  • the preliminary cooling power mi can not assume negative values, which would correspond to heating up the rolling stock point P.
  • the preliminary cooling capacity mi may be limited upward.
  • the cooling curve F2 is individual for the respective upper cooling device 6. In general, however, the cooling curves F2 for the upper cooling devices 6 coincide with one another. In this case, the cooling curve F2 must be determined only once for all upper cooling devices 6.
  • the cooling curve F2 describes, for example as a function of the current state E, a quantity of coolant with which the section 15 of the rolling stock 1 corresponding to the corresponding rolling stock point P is to be acted upon. Alternatively, for example, a relative flow rate (0% to 100%) or an open position (from fully closed to fully open) of a valve of the respective cooling device 6 may be described. If the cooling devices 6 have switching valves (open-close), it can be indicated, for example by means of an approximation, how many released cooling devices 6, 7 are to be skipped, starting from a respectively enabled shared cooling device 6.
  • the control device 11 sets the final cooling capacity mi for the released upper cooling device 6 to the smaller of the two values provisional cooling capacity mi and residual coolant quantity M. Furthermore, it reduces the residual coolant quantity M by the final cooling capacity mi in step S24. Further, in a step S25, the controller 11 arranges the determined final one Cooling power with the selected Walzgut Vietnamese P under assignment to the corresponding approved upper cooling device 6.
  • step S26 the control device 11 checks whether the current location x, up to which the transport of the selected rolling stock point P was simulated, corresponds to the effective area 8 of one of the non-released upper cooling devices 6.
  • step S27 the control device 11 sets the final cooling power mi to a predetermined value for this upper cooling device 6. However, an assignment to the corresponding upper cooling device 6 does not take place.
  • the value determined in the course of step S27 is utilized only in the context of a step S28.
  • step S28 the controller 11 updates the state E by applying the model 16.
  • control device checks in a step S29 whether the current location x, up to which the transport of the selected rolling stock point P was simulated, corresponds to the effective area 9 of one of the released lower cooling devices 7.
  • step S30 the control device 11 uses the then current state E of the selected rolling stock point P to determine a preliminary cooling capacity mi for the corresponding released lower cooling device 7. If step S28 has already been carried out beforehand, the state E which has already been modified in step S30 is used as part of step S30.
  • the determination is made - analogous to step S23 - using a - preferably smooth - cooling curve F3, which is associated with the respective lower cooling device 7.
  • the preliminary cooling capacity mi is always greater than 0 or minimally assumes the value zero. It can not accept negative values. It is possible that the cooling curve F3 is individual for the respective lower cooling device 7. In general, however, the cooling curves F3 for the lower cooling devices 7 coincide with one another. In this case, the cooling curve F3 must be determined only once for all lower cooling devices 7.
  • step S31 the control device 11 sets the final cooling capacity mi for the released lower cooling device 7 to the smaller of the two values provisional cooling capacity mi and residual coolant quantity M. Furthermore, in step S31 it reduces the residual coolant quantity M by the final cooling capacity mi. If step S24 has already been carried out, the amount of residual coolant M already reduced in step S24 is used as part of step S31. Furthermore, in a step S32, the control device 11 assigns the determined final cooling power mi to the selected rolling stock point P assigned to the corresponding released lower cooling device 7.
  • step S33 the control device 11 checks whether the current location x, up to which the transport of the selected rolling stock point P has been simulated, is within the effective range 9 corresponds to one of the unreleased lower cooling devices 7.
  • step S34 the control device 11 sets the final cooling capacity mi to a value predetermined for this lower cooling device 7. An assignment to the corresponding lower cooling devices 7 does not take place.
  • the value set in the context of step S34 is utilized only in the context of a step S35.
  • step S35 the controller 11 updates the state E by using the model 16.
  • the controller 11, when using the model 16 in the step S35 takes into account the cooling capacity mi set in the step S31 or the step S34. If step S28 has already been carried out beforehand, the state E that has already been modified in step S28 is used as part of step S35.
  • step S21 the state E of the selected rolling stock point P is updated in a step S36 using the model 16.
  • step S36 only an interaction with the environment is modeled, which is not caused by the active cooling by the cooling means 6, 7 (air cooling and / or contact cooling via the transport rollers 5).
  • the cooling curve F2 for the upper cooling means 6 and the cooling curve F3 for the lower cooling means 7 are predetermined independently.
  • the two cooling curves F2, F3 can therefore in particular - see also FIG. 1 - be different from each other.
  • the cooling curves F2 and F3 coincide with each other.
  • the statements on the specification of the total cooling function F1 apply accordingly.
  • the procedure of FIG. 4 and 6 can, as already mentioned, be carried out with the working clock ⁇ t ', with which the steps S4 to S6 (or S7) of FIG FIG. 3 be executed.
  • Step S3 of FIG. 3 degenerates in this case to the trivial solution. For only the determined final cooling capacities mi 1: 1 have to be taken over as the actual cooling capacities mi for this one rolling stock point P.
  • step S2 of FIG. 3 under detachment from the working cycle ⁇ t 'in parallel to the steps S4 to S6 (or S7) of FIG. 3 perform.
  • a rolling stock point P is iteratively selected.
  • at least one further rolling material point P which is not picked out, therefore lies, at least as a rule, between two directly successive selected rolling stock points P.
  • the determined final cooling capacities mi 1: 1 can still be adopted as actual cooling powers mi for this rolling stock point P - ie the selected rolling stock point P in step S3.
  • the actual cooling outputs mi are identical to the final cooling outputs mi for the selected rolling stock points mi. Since the actual cooling capacities mi are required in the course of step S6 and the final cooling powers mi are required for the selected rolling stock point P to determine the actual cooling capacities mi, it is readily apparent that the procedure of FIG. 4 and 6 must be completed before the corresponding with the selected Walzgut Vietnamese P section 15 of the real rolling stock 1, starting from the initial location xA, the next released effective range 8, 9 reached.
  • step S1 If not all rolling stock points P are picked out in the course of step S1, the actual cooling outputs mi must also be determined in the course of step S2 for the other rolled material points P not picked out. In this case, different approaches are possible. Possible procedures are described below in connection with the FIGS. 7 and 8 explained. As part of the FIGS. 7 and 8 it is assumed that - see FIG. 2 - The Walzguta P1 and P5 are picked out, so that between the two immediately successive, selected Walzgut Vietnameseen P1 and P5 a total of three other, not picked Walzguta P are, namely the Walzgut the P2, P3 and P4.
  • the procedure according to FIG. 7 is always executable. If, however, a sufficiently high computing power is available - this will be specified later - it is alternatively according to FIG. 8 it is possible to determine the actual cooling capacities mi for the rolling stock points P not picked out (by way of example the rolling stock points P2, P3 and P4) by interpolation of the cooling capacities mi which were determined for the two selected rolling stock points P (according to the example, the rolling stock points P1 and P5).
  • FIG. 9 shows a modification of the procedure of FIG. 4 which is possible if a sufficiently high computing power is available.
  • Steps S11 to S20 of FIG. 4 grouped together. The individual procedures in detail are therefore not explained in more detail, since this already in connection with FIG. 4 is done.
  • a step S41 is executed.
  • the content of step S41 corresponds to steps S11 to S13 of FIG. 4
  • a step S42 is executed.
  • the content of step S42 corresponds to steps S14 to S20 of FIG FIG. 4 .
  • the step S42 is followed by a further step S43, which also contains the contents of steps S14 to S20 of FIG FIG. 4 corresponds.
  • Steps S12 and S13 may also be repeated. However, this is not absolutely necessary because the values have not changed.
  • the total cooling function F1 adapted in step S20 of step S42 is used as the basis of the evaluation of step S14.
  • the initial location xA can be as shown in FIG. 1 lie in front of the cooling section 2.
  • a temperature measuring station 4 can be arranged at the initial location xA.
  • the starting location xA it is possible for the starting location xA to correspond to the representation of FIG. 10 lies in the cooling section 2.
  • no temperature measuring station is usually arranged at the initial location xA.
  • the state E must be determined otherwise in this case.
  • state E may be known based on the observer mentioned in connection with step S7.
  • the destination xZ as shown in FIG. 1 lies behind the cooling section 2.
  • the destination xZ is located in the cooling section 2. Regardless of the location of the starting location xA and the destination xZ, however, it must of course be seen in the transport direction of the rolling stock 1 that the destination xZ lie behind the initial location xA.
  • FIG. 13 a possible implementation of the tracking of step S5 of FIG. 3 and a possible implementation of an observer according to step S7 of FIG. 3 explained in more detail.
  • the procedure of FIG. 13 is performed in parallel for many sections 15. At least the procedure of FIG. 13 for those sections 15 that are located at a certain time between the starting location xA and the destination xZ. However, it can also be carried out for other sections 15 located outside this area. Due to the fact that FIG. 13 an implementation of steps S5 and S7 of FIG. 3 shows, of course, that the approach of FIG. 13 is executed with the working clock ⁇ t '.
  • the controller 11 sets in a step S51 at the moment in which a particular section 15 passes the initial location xA, in contrast to the procedure of FIG. 4 now real - location x of the corresponding section 15 to the initial location xA.
  • the control device 11 detects the actual actual transport speed v.
  • the control device 11 updates the location x of the tracked section 15 on the basis of the actual actual transport speed v and the working cycle ⁇ t '.
  • the steps S51 to S53 essentially correspond to the path tracking of the section 15 as such, ie to the step S5 of FIG FIG.
  • a step S54 the control device 11 checks whether the corresponding section 15 is located in the effective region 8, 9 of a cooling device 6, 7. If this is the case, the control device 11 controls the corresponding cooling device 6, 7 in a step S55. If the corresponding section 15 is in the active region 8, 9 of a released cooling device 6, 7, the control is carried out according to the actual cooling power mi corresponding to the corresponding rolling point P for the corresponding cooling device 6, 7 in the context of step S3 FIG. 3 was assigned. If the corresponding section 15 is in the active region 8, 9 of a non-released cooling device 6, 7, the control is carried out according to the cooling power mi, which otherwise was assigned to the corresponding rolling stock point P, ie not to the procedure according to the invention. Otherwise, step S55 is skipped. Steps S54 and S55 essentially correspond to step S5 of FIG. 3 ,
  • step S56 the controller 11 updates the state E of the corresponding section 15. Specifically, the controller 5 solves the heat equation in accordance with the model 16 in the step S56.
  • the control device 11, if necessary, takes into account the respective control of the respective cooling device 6, 7.
  • the step S56 substantially corresponds to the step S7 of FIG. 3 ,
  • the procedure according to FIG. 13 is, as already mentioned, carried out at least for all sections 15 of the rolling stock 1, which are located between the initial location xA and the destination xZ.
  • the control device 11 thus calculates during the transport of the sections 15 of the rolling stock 1 through the cooling section 2 with the working cycle ⁇ t 'the states E of the transported through the cooling section 2 sections 15 of the rolling stock 1 with. Since the step S56 is further executed with the duty cycle ⁇ t ', the controller 11 determines the states E of the sections 15 in real time.
  • step S57 the controller 11 checks in step S57 whether the relevant section 15 passes a temperature measuring station 21.
  • the temperature measuring station 21 is arranged - in contrast to the input-side temperature measuring station 4 - behind the initial location xA. Depending on the location of the individual case, the temperature measuring station 21 can be arranged in front of the destination xZ, at the destination xZ or behind it. Usually, the temperature measuring station 21 (output-side temperature measuring station) is arranged behind the cooling section 2, for example between the cooling section 2 and a reel 22.
  • the controller 11 acquires an actual temperature T of the corresponding section 15 of the rolling stock 1 in step S58.
  • the controller 11 compares the detected temperature T with a temperature based on that in the frame the repeated execution of the step S56 determined state E is determined.
  • the control device 11 usually determines the deviation ⁇ T between the detected temperature T and the temperature determined on the basis of the state E.
  • the control device 11 uses the comparison - as a rule based on the deviation ⁇ T - to trace at least one parameter k of the model 16. By means of the parameter k, for example, the heat transfer from the rolling stock 1 to the coolant 10 can be adjusted.
  • the present invention can also be applied when the transport speed v is not consistently the same direction, but the rolling stock 1 is transported back and forth in the cooling section 2.
  • steps S54 and S55 the procedure is preferably as described below in connection with FIG. 14 is explained.
  • a step S62 the control device 11 determines those sections 15 of the rolling stock 1, which in the considered working cycle ⁇ t 'in the effective region 8, 9 of the cooling device 6 selected in step S61 , 7 are located.
  • the control device 11 uses the sections 15 determined in step S62 to determine the corresponding rolling stock points P and the actual cooling outputs mi associated with these rolling stock points P for the corresponding cooling device 6, 7. Based on the actual cooling powers mi determined in step S63, the control device 11 determines an effective control of the corresponding cooling device 6, 7 in a step S64.
  • a step S65 the control device 11 checks whether the procedure of steps S61 to S64 already applies to all cooling devices 6 , 7 has performed.
  • step S61 the control device 11 returns to step S61, in which it now selects another, previously not yet selected cooling device 6, 7. Otherwise, the controller 11 proceeds to a step S66. In step S66, the control device 11 outputs the now determined effective drives to the cooling devices 6, 7.
  • the cooling devices 6, 7 have according to FIG. 15 often significant delay times t1, t2.
  • the delay times t1, t2 are those times that pass from a change in the manipulated variable S of the respective cooling device 6, 7 to their reaction R.
  • the delay times t1, t2 can be in the range of several seconds.
  • the delay times t1, t2 may be the same or different. They can also be different from the cooling device 6, 7 to the cooling device 6, 7.
  • the control device 11 preferably takes into account the activation of the cooling devices 6, 7 the delay times t1, t2.
  • step S62 of FIG. 14 modified such that the control device 11, using the travel diagram 17, determines those sections 15 of the rolling stock 1 which are located in the operating cycle ⁇ t 'plus the delay time t1, t2 to be considered in the active region 8, 9 of the cooling device 6, 7 selected in step S61 , The remaining steps of FIG. 14 can be retained.
  • the effective range 8, 9 reaches the next released cooling device 6, 7.
  • the time at which this procedure is completed is referred to below as the completion time.
  • the corresponding section 15 reaches the effective area 8, 9 of the next released cooling device 6, 7 at a time, which is referred to below as the cooling start time.
  • the control of the cooling device 6, 7 must be before the cooling start time by the corresponding delay time t1, t2. At the latest at this time should therefore determine the appropriate actual cooling performance mi be completed.
  • a time difference between the termination time and the cooling start time should be at least as large as the - possibly greater - the delay times t1, t2 of the next released cooling device 6, 7. However, it may be acceptable if this condition is violated.
  • the present invention has many advantages. For example, a so-called rattling of valves is almost completely avoided.
  • the control of the cooling devices 6, 7 instead runs very quiet.
  • the inventive method works very reliably even at very low temperatures (for example, below about 350 ° C). Even a tenfold increase in heat transfer at low temperatures is well controlled.
  • the operating method according to the invention is thus also particularly suitable when so-called dual-phase steel is to be cooled. This also applies if acceleration can not be avoided in the production of the dual-phase steel, because otherwise other target variables such as, for example, a final rolling temperature, a rolling stock thickness and the like would fall out of a permissible tolerance range.
  • the procedure according to the invention offers great flexibility.
  • a high cooling rate can still be used up to a surface temperature of approx. 400 ° C. Then it can be reduced to a very small value, when about 350 ° C below.
  • the method according to the invention also offers the possibility of multiple use within one and the same cooling section 2. It merely has to be taken into account that the initial location xA of the respectively subsequent execution - possibly taking into account the instantaneous transport direction - lies behind the starting location xA of the respectively preceding execution got to.
  • the possibilities of a cooling section 2 with continuously controllable cooling devices 6, 7 can be fully utilized to achieve an optimal cooling result.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
  • Control Of Heat Treatment Processes (AREA)
EP20130193234 2013-11-18 2013-11-18 Procédé de fonctionnement pour une voie de refroidissement Withdrawn EP2873469A1 (fr)

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EP20130193234 EP2873469A1 (fr) 2013-11-18 2013-11-18 Procédé de fonctionnement pour une voie de refroidissement
EP14802607.3A EP3071343B1 (fr) 2013-11-18 2014-11-10 Procédé de fonctionnement pour une voie de refroidissement et voie de refroidissement
KR1020167016485A KR20160089435A (ko) 2013-11-18 2014-11-10 냉각 존 작동 방법
US15/037,619 US20160288181A1 (en) 2013-11-18 2014-11-10 Operating method for a cooling zone
PCT/EP2014/074112 WO2015071200A1 (fr) 2013-11-18 2014-11-10 Procédé pour faire fonctionner une section de refroidissement
CN201480063121.9A CN106061637B (zh) 2013-11-18 2014-11-10 冷却段及其运行方法、控制装置和计算机程序

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EP4101553A1 (fr) 2021-06-07 2022-12-14 Primetals Technologies Austria GmbH Refroidissement d'un produit laminé avant un train finisseur d'un laminoir à chaud
AT525283A4 (de) * 2021-10-29 2023-02-15 Primetals Technologies Austria GmbH Verfahren zur Herstellung eines Dualphasenstahlbands in einer Gieß-Walz-Verbundanlage, ein mit dem Verfahren hergestelltes Dualphasenstahlband und eine Gieß-Walz-Verbundanlage

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EP3599037A1 (fr) * 2018-07-25 2020-01-29 Primetals Technologies Germany GmbH Section de refroidissement à réglage de flux de liquide de refroidissement à l'aide des pompes

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EP3865226A1 (fr) * 2020-02-11 2021-08-18 Primetals Technologies Germany GmbH Détermination de la sensibilité d'une grandeur cible d'une matière à laminer par une grandeur de fonctionnement d'une voie de laminage à chaud
WO2021160404A1 (fr) 2020-02-11 2021-08-19 Primetals Technologies Germany Gmbh Détermination d'une sensibilité d'une variable cible d'un matériau de laminage à partir d'une variable de fonctionnement d'un laminoir à chaud
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AT525283B1 (de) * 2021-10-29 2023-02-15 Primetals Technologies Austria GmbH Verfahren zur Herstellung eines Dualphasenstahlbands in einer Gieß-Walz-Verbundanlage, ein mit dem Verfahren hergestelltes Dualphasenstahlband und eine Gieß-Walz-Verbundanlage

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US20160288181A1 (en) 2016-10-06
KR20160089435A (ko) 2016-07-27
EP3071343A1 (fr) 2016-09-28
CN106061637B (zh) 2018-02-06
CN106061637A (zh) 2016-10-26
WO2015071200A1 (fr) 2015-05-21

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