EP3437748B1 - Mass flow rate regulation in rolling mill plants - Google Patents
Mass flow rate regulation in rolling mill plants Download PDFInfo
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- EP3437748B1 EP3437748B1 EP18181081.3A EP18181081A EP3437748B1 EP 3437748 B1 EP3437748 B1 EP 3437748B1 EP 18181081 A EP18181081 A EP 18181081A EP 3437748 B1 EP3437748 B1 EP 3437748B1
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- European Patent Office
- Prior art keywords
- thickness
- rolling
- strip
- speed
- roll
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- 238000005096 rolling process Methods 0.000 title claims description 95
- 238000000034 method Methods 0.000 claims description 23
- 238000005259 measurement Methods 0.000 claims description 21
- 238000005097 cold rolling Methods 0.000 claims description 11
- 238000012937 correction Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 239000000839 emulsion Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- -1 ferrous metals Chemical class 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Images
Classifications
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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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/16—Adjusting or positioning rolls
-
- 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
- B21B37/46—Roll speed or drive motor 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
- B21B2037/002—Mass flow control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2271/00—Mill stand parameters
- B21B2271/02—Roll gap, screw-down position, draft position
-
- 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
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
Definitions
- the invention relates to a method for controlling a rolling mill, preferably a cold rolling mill, which has one or more roll stands, each with two work rolls, which form a roll gap through which a rolling strip can be transported.
- the invention further relates to a control device and a rolling mill.
- the thickness control of the rolled strip during transport through the roll gap can be carried out by means of a mass flow control, in which the thickness of the rolling stock is calculated from the measured inlet-side thickness and the measured inlet and outlet-side speeds after passing through the roller gap.
- a mass flow control in which the thickness of the rolling stock is calculated from the measured inlet-side thickness and the measured inlet and outlet-side speeds after passing through the roller gap.
- a tandem mill i.e. a rolling mill with several rolling stands arranged one behind the other, it may be difficult to measure the speed at the outlet of the first rolling stand, for example due to the slippage between the rolling stock and the measuring roller unit, emulsion / oil on the material to be measured, steam or lack of space, for example if one Laser is used for measurement.
- the EP 1 488 863 A2 describes a system and method for controlling the thickness quality in a rolling process.
- the system includes an online process model that adapts model parameters online in dialog with a subordinate control device of the rolling mill.
- the method according to the invention is used to control or regulate (used synonymously here) a rolling mill, preferably a cold rolling mill.
- the rolling mill has one or more roll stands, each with two work rolls which form a roll gap through which a roll belt can be transported.
- the rolled strip is a strip-shaped metal material, for example made of steel or a non-ferrous metal, which is to be subjected to a one- or multi-stage rolling process by the work rolls.
- One or both work rolls of the relevant roll stand can be moved relative to one another, so that the roll gap, ie the distance between the work rolls, can be adjusted.
- a reference speed is first provided, which is a parameter for controlling the rolling mill.
- the reference speed can be, for example, a target speed at which the rolled strip is to be transported through the rolling train, for example if the rolling train is in a stationary or quasi-stationary state after starting.
- the reference speed can be a speed parameter with which a roller, preferably a work roller, deflection roller or reel, is controlled in the rolling train.
- the reference speed can also be another parameter, as long as it is not determined by measuring the run-out speed of the rolled strip from the roll gap.
- the reference speed can be set in advance, it can be constant or it can be a function of time.
- the speed and thickness of the rolled strip are measured before it enters the roll gap.
- the roll gap of the relevant and / or one or more other roll stands in the rolling mill is set on the basis of the measured speed and thickness before entering the roll gap and the reference speed.
- the control is therefore not carried out taking into account any measured strip speed on the exit side or calculated from actual values of the rolling mill, but using the reference speed, ie a parameter for controlling the rolling mill.
- the reference speed is used in the exit. This means that the speed measurement or speed calculation of the rolled strip at the outlet of the roll gap can be omitted. Costs that would otherwise be incurred for the provision, installation, maintenance, etc. of corresponding sensors and electronic devices can be saved.
- the control is less affected by measurement errors, which can occur in particular when measuring the speed at the outlet of the first roll stand, for example due to the slippage between the rolling stock and the measuring roller unit, emulsion / oil on the material to be measured, steam or lack of space, for example if a laser is used for the measurement becomes.
- the reliability of the thickness control is increased, which in turn has a positive effect on the quality of the rolled product to be manufactured.
- the control shown enables thickness control with high dynamics and direct reaction in the roll gap.
- the difference between the actual thickness of the rolled strip at the exit of the rolling mill and the target thickness is preferably corrected by means of a PI control or PID control in order to obtain the desired strip thickness in a reliable manner and with high accuracy.
- a reference strip thickness is preferably provided, which is a parameter for controlling the rolling mill.
- the reference strip thickness can be the target thickness that is sought for the rolled strip after passing through the rolling mill, in particular if the rolling mill is in a stationary or quasi-stationary state after starting.
- the reference strip thickness can be determined in advance, for example, it can be constant or a function of time or a function of the length of the rolling stock.
- a thickness deviation of the rolled strip is calculated taking into account the reference speed and the reference strip thickness.
- the calculated thickness deviation is the difference between the inlet-side mass flow thickness, which is calculated using the divisor reference speed, for example, and the reference band thickness.
- the strip thickness on the outlet side is also measured, a measured thickness deviation is determined therefrom and the measured thickness deviation is compared with the calculated thickness deviation.
- the reference speed for calculating the thickness deviation of the rolled strip is preferably determined taking into account one or more correction values from a control of the tension, the strip thickness, one or more drive torques and / or the speed control, in order to improve the control accuracy.
- the additional variable is particularly preferably a lead that can be calculated, accepted or otherwise determined, for example.
- the advance can be constant or a function of time or a Function of the reference speed.
- the advance is preferably calculated, the calculation of the advance being at least one non-measured variable and / or at least one measured variable Size includes.
- the advance is preferably calculated taking into account various system states before and / or during the rolling process, so that the control accuracy and reaction of the roll gap in the thickness control can be guaranteed even without measuring the strip speed on the exit side.
- the mass flow control of one or more roll stands is operated without measuring and tracking the thickness on the outlet side, i.e. exclusively with the inlet-side thickness and speed measurement.
- the rolling mill has a number of roll stands, the thickness of the roll strip being measured behind the last roll stand and the reference strip thickness being used to adjust the roll gap of one or more roll stands (in particular to determine the mass flow thickness on one or more roll stands), so that in this respect one Measurement of the strip thickness on the outlet side can be dispensed with.
- the thickness measurement on the outlet side can also be dispensed with.
- the thickness control in the last mill stand can regulate the thickness offset in order to achieve the desired target thickness.
- all dynamic disturbances such as disturbances in the inlet thickness and / or fluctuations in hardness, can be corrected by the first roll stand.
- a thickness measurement behind the first rolling stand is not absolutely necessary in this variant, a corresponding thickness measuring device can nevertheless be provided in order to provide a possibility of relapse if the inlet-side thickness measurement fails.
- the device according to the invention for controlling a rolling mill preferably a cold rolling mill, is set up to carry out a method as set out above.
- the control can be implemented using an electronic circuit.
- the controller can be in the form of software that, if it is executed on a computing device, which initiates the corresponding calculations and steps for controlling the rolling mill.
- the control described is particularly well applicable to the operation of cold rolling mills for processing metal strips.
- the rolling mill can be designed as a reversing system with a change of direction in the strip guide.
- the invention can also be implemented in other areas insofar as it relates to a rolling process in which a desired thickness of the rolled product is to be set automatically.
- the Figure 1 schematically shows a tandem mill or rolling mill 1 with four rolling stands 10 arranged one behind the other, preferably for a cold rolling mill.
- the rolling mill 1 has a decoiler 2 and a decoiler 3.
- a rolled strip or rolling stock B is fed to the roll stands 10 in the transport direction R, possibly via deflection rollers, and after passing through the roll stands 10, ie after the end of the rolling processing, is wound up by the take-up reel 3.
- the supply and discharge of the rolled strip B via the two reels 2 and 3 is only an example; the rolled strip B can also be fed to the roll stands 10 in another way and removed for further processing, transport, etc.
- each roll stand 10 has two support rolls 11 and two work rolls 12. However, it should be pointed out that the method described can be carried out and is suitable for all stand arrangements with two or more rolls per stand.
- reference numerals 11 and 12 are shown in FIG Figure 1 not shown, but they go out of the Figure 2 in which a roll stand 10 is removed and shown in an enlarged manner.
- a work roll 12 is in contact with a backup roll 11. Between the two work rolls 12 there is a roll gap through which the rolled strip B is passed. The roll gap can be adjusted by one or both work rolls 12 forming the roll gap being adjustable relative to one another.
- the work rolls 12 and / or backup rolls 11 are driven, for example, by one or more electric motors (not shown in the figures) in a rotating manner, possibly with the interposition of a gear, a clutch, a brake, etc.
- the roll stands 10 each have a drive control unit 33.
- each roll stand 10 is assigned a thickness control device 30, which communicates with a gap control device 31 for setting the gap between the corresponding work rolls 12.
- a tension control 22 is arranged in front of each roll stand 10 and has an actuator for changing the position of the rolling strip B relative to the roll stand 10. A change in position is used to regulate the tension of the rolled strip B on the inlet side. A change in tension is equivalent to a change in speed of the rolling strip B.
- the tension controls 22 of the second to fourth rolling stands 10 each have a tension control device 32 for adjusting the setting.
- control units 30, 31, 32, 33 Possible communication paths between the control units 30, 31, 32, 33 and the associated actuators, actuators, motors, etc. are in the Figure 1 shown schematically. Communication can be physical or wireless. Even if the control units 30, 31, 32, 33 in the Figure 1 are shown separately, these can of course be integrally formed or be part of a central control. In this context, the term “device” does not necessarily denote a mechanical entity, because the control devices 30, 31, 32, 33 can also be implemented with the aid of software that causes the control of the rolling mill 1 when it is executed on a computer.
- the setting of the roll gap of the respective roll stands 10 takes place via a mass flow control.
- the starting point is a maintenance variable, the product of the strip speed and the strip thickness shifted into the roll gap, which is referred to as the "mass flow variable" and, for example, analogously to an inlet-side when the rolled strip B passes through the roll stand 10 Thickness disturbance or the change of other process variables such as belt strength, gap friction and / or belt speed changed.
- v i t * H i t v i - 1 t * H i - 1 t
- v i (t) denotes the strip speed at the outlet of the roll stand 10 (equal to the strip speed at the entrance of a possibly subsequent roll stand 10) as a function of time.
- h i (t) denotes the measured strip thickness at the outlet of the roll stand 10 (equal to the roll strip thickness at the entrance to a subsequent roll stand 10) as a function of time.
- v i-1 (t) denotes the strip speed measured with respect to the roll stand 10 on the entry side as a function of time
- h i (t) denotes the strip thickness measured with respect to the roll stand 10 on the entry side.
- the reference strip thickness is a parameter for controlling the rolling mill.
- the reference strip thickness can be the target thickness that is sought for the rolled strip after passing through the rolling mill, in particular if the rolling mill is in a stationary or quasi-stationary state after starting.
- the reference strip thickness can be determined in advance, for example, it can be constant or a function of time and / or the strip length.
- a reference speed at the outlet v iR (t) is used to calculate the mass flow thickness. This is possible because the effects of a change in pitch of the rolled strip B relative to the roll stand 10 can be neglected by the tension control 22.
- the change in the outlet speed only includes the change in advance caused by the change in position, which is very small in relation to the absolute change, in particular in the speed ranges in which mass flow control is carried out.
- the reference speed v iR (t) can therefore be a speed parameter with which the rolling mill 1 is controlled.
- the measurement or calculation of a speed by sending a measured quantity that corresponds to the speed at the outlet of the roll gap can therefore be dispensed with.
- the reference speed v iR (t) can, for example, be a target speed at which the rolling strip B is to be transported through the rolling train 1, for example when the rolling train 1 is in a stationary or quasi-stationary state after starting.
- the reference speed v iR (t) can, for example, also be a speed parameter with which a roller, preferably a work roller 12 or a reel, is controlled in the rolling mill 1.
- the reference speed can be set in advance, it can be constant or it can be a function of time or tape length. However, the reference speed does not have to contain one or more correction values from other control systems. These correction values can consist, for example, of control corrections for the train, the strip thickness and / or the speed control or can be calculated.
- H iDevCalc t H ITRK - 1 t * v i - 1 t v iR t - H iR
- h iTrk-1 (t) denotes the strip thickness of the rolled strip B measured on the inlet side (on the i'th roll stand 10).
- the rolled strip 10 with the strip thickness deviation h iDevCalc (t) thus calculated is then pushed or transported to the exit-side thickness measuring device 20.
- This calculated strip thickness deviation transported to the thickness measuring device 20 at the outlet is compared with the thickness deviation measured at the outlet.
- the error is tracked, this also taking place with the reference speed v iR (t) .
- thickness errors can be tracked and the target surface at the end of rolling mill 1 is reached.
- the difference between the actual thickness of the rolled strip 10 at the end of the rolling train 1 and the target thickness can be corrected, for example, by means of a PI controller or PID controller, as well as by means of feedback via a filter unit.
- the thickness measurement on the exit side can also be dispensed with.
- the thickness control in the last roll stand 10 can regulate the thickness offset in order to arrive at the desired target thickness. All dynamic disturbances, such as disturbances of the inlet thickness and / or fluctuations in hardness, can be according to a variant of these Embodiment can already be corrected by the first roll stand 10. Although a thickness measurement behind the first roll stand 10 is not absolutely necessary in this variant, a corresponding thickness measuring device can nevertheless be provided in order to provide a possibility of relapse if the inlet-side thickness measurement fails.
- the speed measurement or speed calculation of the rolled strip B at the outlet of one or more roll stands 10 can be omitted. This can save costs that would otherwise be incurred for the provision, installation, maintenance, etc. of corresponding sensors and control units.
- the control is less affected by measurement errors, which can occur in particular when measuring the speed at the outlet of the first roll stand 10, for example due to the slippage between the rolling stock and the measuring roller unit, emulsion / oil on the material to be measured, steam or lack of space, for example if a laser is used for the measurement is used.
- the reliability of the thickness control is increased, which in turn has a positive effect on the quality of the rolled product to be manufactured.
- the approach shown enables thickness control with high dynamics and direct reaction in the roll gap.
- control or regulation is particularly preferably applicable for cold rolling mills for rolling strip-shaped metal materials, in particular metal strips made of steel or non-ferrous metals, the so-called non-ferrous metals.
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- Mechanical Engineering (AREA)
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Description
Die Erfindung betrifft ein Verfahren zur Steuerung einer Walzstraße, vorzugsweise einer Kaltwalzstraße, die ein oder mehrere Walzgerüste mit jeweils zwei Arbeitswalzen aufweist, die einen Walzspalt ausbilden, durch den ein Walzband transportierbar ist. Die Erfindung betrifft ferner eine Steuervorrichtung sowie eine Walzstraße.The invention relates to a method for controlling a rolling mill, preferably a cold rolling mill, which has one or more roll stands, each with two work rolls, which form a roll gap through which a rolling strip can be transported. The invention further relates to a control device and a rolling mill.
Bei Walzanlagen, insbesondere Kaltwalzanlagen, kann die Dickenregelung des Walzbandes beim Transport durch den Walzspalt mittels einer Massenflussregelung durchgeführt werden, bei der aus der gemessenen einlaufseitigen Dicke und den gemessenen ein- und auslaufseitigen Geschwindigkeiten die Dicke des Walzguts nach Durchlaufen des Walzspalts berechnet wird. Allerdings ist die Geschwindigkeitsmessung am Auslauf des Walzgerüsts oft schwierig zu verwirklichen. So kann bei einer Tandemstraße, d.h. einer Walzstraße mit mehreren hintereinander angeordneten Walzgerüsten, die Messung der Geschwindigkeit am Auslauf des ersten Walzgerüsts schwierig sein, etwa aufgrund des Schlupfes zwischen Walzgut und Messrolleneinheit, Emulsion/Öl auf dem Messgut, Dampf oder Platzmangel, beispielsweise wenn ein Laser zur Messung verwendet wird.In the case of rolling mills, in particular cold rolling mills, the thickness control of the rolled strip during transport through the roll gap can be carried out by means of a mass flow control, in which the thickness of the rolling stock is calculated from the measured inlet-side thickness and the measured inlet and outlet-side speeds after passing through the roller gap. However, it is often difficult to measure the speed at the outlet of the roll stand. In a tandem mill, i.e. a rolling mill with several rolling stands arranged one behind the other, it may be difficult to measure the speed at the outlet of the first rolling stand, for example due to the slippage between the rolling stock and the measuring roller unit, emulsion / oil on the material to be measured, steam or lack of space, for example if one Laser is used for measurement.
Es ist bekannt, auf die direkte Geschwindigkeitsmessung am Ausgang des Walzspaltes zu verzichten und stattdessen aus verschiedenen Ist-Größen der Walzstraße, etwa der Gerüstgeschwindigkeit oder der Haspelgeschwindigkeit, auf die Auslaufgeschwindigkeit zu schließen. So beschreibt die
Die
Eine Aufgabe der Erfindung besteht darin, ein Verfahren sowie eine Vorrichtung zur Steuerung einer Walzstraße, vorzugsweise einer Kaltwalzstraße, bereitzustellen, die bei einer konstruktiven Vereinfachung der Walzstraße eine hohe Regelungsgenauigkeit ermöglichen.It is an object of the invention to provide a method and a device for controlling a rolling mill, preferably a cold rolling mill, which allow a high level of control accuracy while simplifying the design of the rolling mill.
Gelöst wird die Aufgabe mit einem Verfahren mit den Merkmalen des Anspruchs 1, einer Vorrichtung mit den Merkmalen des Anspruchs 11 sowie einer Walzstraße mit den Merkmalen des Anspruchs 12. Vorteilhafte Weiterbildungen folgen aus den Unteransprüchen, der folgenden Darstellung der Erfindung sowie der Beschreibung bevorzugter Ausführungsbeispiele.The object is achieved with a method with the features of claim 1, a device with the features of
Zur Definition von Relativpositionen werden Bezeichnungen wie "vor", "hinter", "einlaufseitig", "auslaufseitig" usw. verwendet werden. Diese sind in Bezug auf die Transportrichtung des Walzbands zu verstehen.To define relative positions, terms such as "in front", "behind", "inlet side", "outlet side" etc. are used. These are to be understood in relation to the direction of transport of the rolled strip.
Das erfindungsgemäße Verfahren dient der Steuerung oder Regelung (hier synonym verwendet) einer Walzstraße, vorzugsweise einer Kaltwalzstraße. Die Walzstraße weist ein oder mehrere Walzgerüste mit jeweils zwei Arbeitswalzen auf, die einen Walzspalt ausbilden, durch den ein Walzband transportierbar ist. Das Walzband ist ein bandförmiges Metallmaterial, etwa aus Stahl oder einem Nichteisenmetall, das einem ein- oder mehrstufigen Walzprozess durch die Arbeitswalzen zu unterziehen ist. Eine oder beide Arbeitswalzen des betreffenden Walzgerüsts sind relativ zueinander verfahrbar, so dass der Walzspalt, d.h. der Abstand zwischen den Arbeitswalzen, einstellbar ist.The method according to the invention is used to control or regulate (used synonymously here) a rolling mill, preferably a cold rolling mill. The rolling mill has one or more roll stands, each with two work rolls which form a roll gap through which a roll belt can be transported. The rolled strip is a strip-shaped metal material, for example made of steel or a non-ferrous metal, which is to be subjected to a one- or multi-stage rolling process by the work rolls. One or both work rolls of the relevant roll stand can be moved relative to one another, so that the roll gap, ie the distance between the work rolls, can be adjusted.
Zur Steuerung der Walzstraße gemäß der Erfindung wird zunächst eine Referenzgeschwindigkeit bereitgestellt, die ein Parameter zur Ansteuerung der Walzstraße ist. Die Referenzgeschwindigkeit kann beispielsweise eine Zielgeschwindigkeit sein, mit der das Walzband durch die Walzstraße zu transportieren ist, etwa wenn sich die Walzstraße nach dem Anfahren in einem stationären oder quasi-stationären Zustand befindet. Gemäß einer anderen Ausführungsform kann die Referenzgeschwindigkeit ein Geschwindigkeitsparameter sein, mit dem eine Walze, vorzugsweise Arbeitswalze, Umlenkrolle oder Haspel, in der Walzstraße angesteuert wird. Die Referenzgeschwindigkeit kann auch ein anderer Parameter sein, solange er nicht durch Messung der Auslaufgeschwindigkeit des Walzbands aus dem Walzspalt ermittelt wird. Die Referenzgeschwindigkeit kann beispielsweise im Voraus festgelegt werden, sie kann konstant oder eine Funktion der Zeit sein.To control the rolling mill according to the invention, a reference speed is first provided, which is a parameter for controlling the rolling mill. The reference speed can be, for example, a target speed at which the rolled strip is to be transported through the rolling train, for example if the rolling train is in a stationary or quasi-stationary state after starting. According to another embodiment, the reference speed can be a speed parameter with which a roller, preferably a work roller, deflection roller or reel, is controlled in the rolling train. The reference speed can also be another parameter, as long as it is not determined by measuring the run-out speed of the rolled strip from the roll gap. For example, the reference speed can be set in advance, it can be constant or it can be a function of time.
Erfindungsgemäß werden die Geschwindigkeit und Dicke des Walzbands vor dem Einlauf in den Walzspalt gemessen. Der Walzspalt des betreffenden und/oder eines oder mehrerer anderer Walzgerüste in der Walzstraße wird auf der Grundlage der gemessenen Geschwindigkeit und Dicke vor dem Einlauf in den Walzspalt sowie der Referenzgeschwindigkeit eingestellt.According to the invention, the speed and thickness of the rolled strip are measured before it enters the roll gap. The roll gap of the relevant and / or one or more other roll stands in the rolling mill is set on the basis of the measured speed and thickness before entering the roll gap and the reference speed.
Die Steuerung erfolgt demnach nicht unter Berücksichtigung einer etwaigen gemessenen oder aus Ist-Größen der Walzstraße berechneten auslaufseitigen Bandgeschwindigkeit sondern unter Verwendung der Referenzgeschwindigkeit, d.h. eines Parameters zur Ansteuerung der Walzstraße. Insbesondere kann zur Berechnung der Massenflussdicke, d.h. dem Produkt aus Bandgeschwindigkeit und Banddicke, die beim Durchlauf durch die Walzgerüste eine Erhaltungsgröße ist (im Einlauf des Walzgerüstes entspricht das Produkt aus Bandgeschwindigkeit und Banddicke dem im Auslauf des Walzgerüstes), die Referenzgeschwindigkeit im Auslauf verwendet werden. Dadurch kann die Geschwindigkeitsmessung oder Geschwindigkeitsberechnung des Walzbands am Ausgang des Walzspalts entfallen. Es können Kosten eingespart werden, die andernfalls zur Bereitstellung, Installation, Wartung usw. von entsprechenden Sensoren und elektronischen Einrichtungen anfallen würden. Die Regelung wird weniger durch Messfehler beeinträchtigt, die insbesondere bei einer Messung der Geschwindigkeit am Auslauf des ersten Walzgerüsts auftreten können, etwa aufgrund des Schlupfes zwischen Walzgut und Messrolleneinheit, Emulsion/Öl auf dem Messgut, Dampf oder Platzmangel, beispielsweise wenn ein Laser zur Messung verwendet wird. Die Zuverlässigkeit der Dickenregelung wird erhöht, was sich wiederrum positiv auf die Güte des herzustellenden Walzprodukts auswirkt. Insbesondere auch bei Anlagen mit schwierigen Einbausituationen ermöglicht die dargestellte Steuerung eine Dickenregelung mit hoher Dynamik und direkter Reaktion im Walzspalt.The control is therefore not carried out taking into account any measured strip speed on the exit side or calculated from actual values of the rolling mill, but using the reference speed, ie a parameter for controlling the rolling mill. In particular, for Calculation of the mass flow thickness, i.e. the product of the strip speed and strip thickness, which is a conservation factor when passing through the roll stands (in the entry of the roll stand, the product of the strip speed and strip thickness corresponds to that in the exit of the roll stand), the reference speed is used in the exit. This means that the speed measurement or speed calculation of the rolled strip at the outlet of the roll gap can be omitted. Costs that would otherwise be incurred for the provision, installation, maintenance, etc. of corresponding sensors and electronic devices can be saved. The control is less affected by measurement errors, which can occur in particular when measuring the speed at the outlet of the first roll stand, for example due to the slippage between the rolling stock and the measuring roller unit, emulsion / oil on the material to be measured, steam or lack of space, for example if a laser is used for the measurement becomes. The reliability of the thickness control is increased, which in turn has a positive effect on the quality of the rolled product to be manufactured. Especially in systems with difficult installation situations, the control shown enables thickness control with high dynamics and direct reaction in the roll gap.
Vorzugsweise wird die Differenz zwischen der Istdicke des Walzbandes am Ausgang der Walzstraße und der Solldicke mittels einer PI-Regelung oder PID-Regelung ausgeregelt, um die angestrebte Banddicke auf zuverlässige Weise und mit hoher Genauigkeit zu erhalten.The difference between the actual thickness of the rolled strip at the exit of the rolling mill and the target thickness is preferably corrected by means of a PI control or PID control in order to obtain the desired strip thickness in a reliable manner and with high accuracy.
Vorzugsweise wird neben der Referenzgeschwindigkeit eine Referenzbanddicke bereitgestellt, die ein Parameter zur Ansteuerung der Walzstraße ist. So kann die Referenzbanddicke beispielsweise jene Zieldicke sein, die für das Walzband nach Durchlaufen der Walzstraße angestrebt wird, insbesondere wenn sich die Walzstraße nach dem Anfahren in einem stationären oder quasi-stationären Zustand befindet. Die Referenzbanddicke kann beispielsweise im Voraus festgelegt werden, sie kann konstant oder eine Funktion der Zeit oder eine Funktion der Länge des Walzguts sein. Zum Einstellen des Walzspalts wird vorzugsweise eine Dickenabweichung des Walzbands unter Berücksichtigung der Referenzgeschwindigkeit und der Referenzbanddicke berechnet. Konkret ist die berechnete Dickenabweichung die Differenz aus der einlaufseitigen Massenflussdicke, die beispielsweise mit dem Divisor Referenzgeschwindigkeit berechnet wird, und der Referenzbanddicke. Vorzugsweise wird die auslaufseitige Banddicke ferner gemessen, daraus eine gemessene Dickenabweichung bestimmt und die gemessene Dickenabweichung mit der berechneten Dickenabweichung verglichen.In addition to the reference speed, a reference strip thickness is preferably provided, which is a parameter for controlling the rolling mill. For example, the reference strip thickness can be the target thickness that is sought for the rolled strip after passing through the rolling mill, in particular if the rolling mill is in a stationary or quasi-stationary state after starting. The reference strip thickness can be determined in advance, for example, it can be constant or a function of time or a function of the length of the rolling stock. To set the roll gap preferably a thickness deviation of the rolled strip is calculated taking into account the reference speed and the reference strip thickness. Specifically, the calculated thickness deviation is the difference between the inlet-side mass flow thickness, which is calculated using the divisor reference speed, for example, and the reference band thickness. Preferably, the strip thickness on the outlet side is also measured, a measured thickness deviation is determined therefrom and the measured thickness deviation is compared with the calculated thickness deviation.
Vorzugsweise wird die Referenzgeschwindigkeit zur Berechnung der Dickenabweichung des Walzbands unter Berücksichtigung eines oder mehrerer Korrekturwerte aus einer Regelung des Zugs, der Banddicke, eines oder mehrerer Antriebsmomente und/oder der Geschwindigkeitsführung bestimmt, um die Regelungsgenauigkeit zu verbessern. Aus dem gleichen Grund wird gemäß einer bevorzugten Ausführungsform die Referenzgeschwindigkeit zur Berechnung der Dickenabweichung des Walzbands aus einer Zielgeschwindigkeit und unter Berücksichtigung einer oder mehrerer zusätzlicher Größen, etwa der Zieldicke und/oder der Abnahme der Walzenrauigkeit und/oder der Walzkraft und/oder des Zielzugs, berechnet.The reference speed for calculating the thickness deviation of the rolled strip is preferably determined taking into account one or more correction values from a control of the tension, the strip thickness, one or more drive torques and / or the speed control, in order to improve the control accuracy. For the same reason, according to a preferred embodiment, the reference speed for calculating the thickness deviation of the rolled strip from a target speed and taking into account one or more additional variables, such as the target thickness and / or the decrease in roll roughness and / or the rolling force and / or the target pull, calculated.
Die zusätzliche Größe ist besonders bevorzugt eine Voreilung, die beispielsweise berechnet, angenommen oder anderweitig ermittelt werden kann. Die Voreilung, die mit der Fließscheidenlage zusammenhängt, ist definiert als das Verhältnis der Lineargeschwindigkeit der Walze, etwa Arbeitswalze, Umlenkrolle usw., zur Auslaufgeschwindigkeit des Walzbandes. Genauer gesagt: Voreilung [%] = (Geschwindigkeit des Walzbands am Auslauf [m/s] / Lineare Geschwindigkeit der Walze [m/s]) - 1) ∗100. Die Voreilung kann über den Walzprozess konstant oder eine Funktion der Zeit oder eine Funktion der Referenzgeschwindigkeit sein.The additional variable is particularly preferably a lead that can be calculated, accepted or otherwise determined, for example. The advance, which is related to the flow sheath position, is defined as the ratio of the linear speed of the roll, for example work roll, deflection roller, etc., to the exit speed of the rolled strip. More precisely: advance [%] = (speed of the rolled strip at the outlet [m / s] / linear speed of the roll [m / s]) - 1) ∗ 100. The advance can be constant or a function of time or a Function of the reference speed.
Vorzugsweise wird die Voreilung berechnet, wobei die Berechnung der Voreilung mindestens eine nicht-gemessene Größe und/oder mindestens eine gemessene Größe umfasst. So wird die Voreilung vorzugsweise unter Berücksichtigung verschiedener Anlagenzustände vor Beginn und/oder während des Walzprozesses berechnet, wodurch die Regelungsgenauigkeit und Reaktion des Walzspalts bei der Dickenregelung auch ohne Messung der auslaufseitigen Bandgeschwindigkeit gewährleistet werden können.The advance is preferably calculated, the calculation of the advance being at least one non-measured variable and / or at least one measured variable Size includes. The advance is preferably calculated taking into account various system states before and / or during the rolling process, so that the control accuracy and reaction of the roll gap in the thickness control can be guaranteed even without measuring the strip speed on the exit side.
Gemäß einer anderen Ausführungsform wird die Massenflussregelung eines oder mehrerer Walzgerüste jedoch ohne Messung und Nachführung der auslaufseitigen Dicke betrieben, d.h. ausschließlich mit der einlaufseitigen Dicken- und Geschwindigkeitsmessung. Hierzu weist die Walzstraße mehrere Walzgerüste auf, wobei die Dicke des Walzbands hinter dem letzten Walzgerüst gemessen wird und zur Einstellung des Walzspalts eines oder mehrerer Walzgerüste (insbesondere zur Bestimmung der Massenflussdicke an einem oder mehreren Walzgerüsten) die Referenzbanddicke verwendet wird, so dass diesbezüglich auf eine Messung der auslaufseitigen Banddicke verzichtet werden kann. Beispielsweise kann bei einer Walzstraße mit mehreren Walzgerüsten zusätzlich zu dem Verzicht auf eine auslaufseitige Geschwindigkeitsmessung im ersten Walzgerüst auch auf die auslaufseitige Dickenmessung verzichtet werden. In diesem Fall kann die Dickenregelung im letzten Walzgerüst den Dickenoffset ausregeln, um auf die gewünschte Zieldicke zu kommen. Alle dynamischen Störungen, wie etwa Störungen der Einlaufdicke und/oder Härteschwankungen, können gemäß einer Variante dieser Ausführungsform schon vom ersten Walzgerüst ausgeregelt werden. Obwohl eine Dickenmessung hinter dem ersten Walzgerüst in dieser Variante nicht unbedingt erforderlich ist, kann dennoch ein entsprechendes Dickenmessgerät vorgesehen sein, um bei einem Ausfall der einlaufseitigen Dickenmessung eine Rückfallmöglichkeit bereitzustellen.According to another embodiment, the mass flow control of one or more roll stands is operated without measuring and tracking the thickness on the outlet side, i.e. exclusively with the inlet-side thickness and speed measurement. For this purpose, the rolling mill has a number of roll stands, the thickness of the roll strip being measured behind the last roll stand and the reference strip thickness being used to adjust the roll gap of one or more roll stands (in particular to determine the mass flow thickness on one or more roll stands), so that in this respect one Measurement of the strip thickness on the outlet side can be dispensed with. For example, in the case of a rolling mill with a plurality of roll stands, in addition to the omission of a speed measurement on the outlet side, the thickness measurement on the outlet side can also be dispensed with. In this case, the thickness control in the last mill stand can regulate the thickness offset in order to achieve the desired target thickness. According to a variant of this embodiment, all dynamic disturbances, such as disturbances in the inlet thickness and / or fluctuations in hardness, can be corrected by the first roll stand. Although a thickness measurement behind the first rolling stand is not absolutely necessary in this variant, a corresponding thickness measuring device can nevertheless be provided in order to provide a possibility of relapse if the inlet-side thickness measurement fails.
Die erfindungsgemäße Vorrichtung zum Steuern einer Walzstraße, vorzugsweise Kaltwalzstraße, ist eingerichtet, um ein Verfahren, wie oben dargelegt, auszuführen. So kann die Steuerung etwa mit Hilfe einer elektronischen Schaltung realisiert werden. Die Steuerung kann in Form einer Software vorliegen, die, wenn sie auf einem Rechengerät ausgeführt wird, die entsprechenden Berechnungen und Schritte zur Steuerung der Walzstraße veranlasst.The device according to the invention for controlling a rolling mill, preferably a cold rolling mill, is set up to carry out a method as set out above. For example, the control can be implemented using an electronic circuit. The controller can be in the form of software that, if it is executed on a computing device, which initiates the corresponding calculations and steps for controlling the rolling mill.
Die dargelegte Steuerung ist besonders gut zum Betrieb von Kaltwalzstraßen zur Bearbeitung von Metallbändern anwendbar. Die Walzstraße kann als Reversieranlage mit Richtungswechsel in der Bandführung angelegt sein. Doch die Erfindung kann auch in anderen Bereichen umgesetzt werden, soweit sie einen Walzprozess betrifft, bei dem eine gewünschte Dicke des Walzprodukts auf automatische Weise einzustellen ist.The control described is particularly well applicable to the operation of cold rolling mills for processing metal strips. The rolling mill can be designed as a reversing system with a change of direction in the strip guide. However, the invention can also be implemented in other areas insofar as it relates to a rolling process in which a desired thickness of the rolled product is to be set automatically.
Weitere Vorteile und Merkmale der vorliegenden Erfindung sind aus der folgenden Beschreibung bevorzugter Ausführungsbeispiele ersichtlich. Die dort beschriebenen Merkmale können alleinstehend oder in Kombination mit einem oder mehreren der oben dargelegten Merkmale realisiert werden, insofern sich die Merkmale nicht widersprechen. Die folgende Beschreibung der bevorzugten Ausführungsbeispiele erfolgt mit Bezug auf die begleitenden Zeichnungen.Further advantages and features of the present invention are evident from the following description of preferred exemplary embodiments. The features described there can be implemented on their own or in combination with one or more of the features set out above, provided that the features do not contradict each other. The following description of the preferred embodiments is made with reference to the accompanying drawings.
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Die
Figur 1 zeigt schematisch eine Tandemstraße mit vier hintereinander angeordneten Walzgerüsten.TheFigure 1 schematically shows a tandem mill with four rolling stands arranged one behind the other. -
Die
Figur 2 zeigt schematisch ein Walzgerüst mit zwei Stütz- und zwei Arbeitswalzen.TheFigure 2 shows schematically a roll stand with two support and two work rolls.
Im Folgenden werden bevorzugte Ausführungsbeispiele anhand der Figuren beschrieben. Dabei sind gleiche, ähnliche oder gleichwirkende Elemente mit identischen Bezugszeichen versehen, und auf eine wiederholende Beschreibung dieser Elemente wird teilweise verzichtet, um Redundanzen zu vermeiden.Preferred exemplary embodiments are described below with reference to the figures. The same, similar or equivalent elements are provided with identical reference numerals, and a repeated description of these elements is partially omitted in order to avoid redundancies.
Die
Zur Unterscheidung der Walzgerüste 10 werden diese in der Transportrichtung R des Walzbandes B, d.h. in der Ansicht der
Vor dem ersten Walzgerüst 10, vor dem zweiten und hinter dem vierten Walzgerüst 10 sind je ein Dickenmessgerät 20 angeordnet, das zur Messung der Dicke des Walzbandes B an der entsprechenden Position eingerichtet ist. Im vorliegenden Ausführungsbeispiel ist jedem Walzgerüst 10 ein Dicken-Steuergerät 30 zugeordnet, das mit je einem Spalt-Steuergerät 31 zur Einstellung des Spalts zwischen den entsprechenden Arbeitswalzen 12 kommuniziert. Ferner ist im vorliegenden Beispiel vor jedem Walzgerüst 10 eine Zugregelung 22 angeordnet, die ein Stellglied zur Änderung der Anstellung des Walzbandes B relativ zum Walzgerüst 10 aufweist. Eine Anstellungsänderung wird genutzt, um den einlaufseitigen Zug des Walzbandes B zu regeln. Eine Zugänderung ist gleichzusetzen mit einer Geschwindigkeitsänderung des Walzbandes B. Die Zugregelungen 22 der zweiten bis vierten Walzgerüste 10 weisen je ein Zug-Steuergerät 32 zur Einstellung der Anstellung auf.In front of the
Mögliche Kommunikationswege zwischen den Steuergeräten 30, 31, 32, 33 und den zugehörigen Stellgliedern, Aktuatoren, Motoren usw. sind in der
Die Einstellung des Walzspalts der jeweiligen Walzgerüste 10 erfolgt über eine Massenflussregelung. Ausgangspunkt ist eine Erhaltungsgröße, das Produkt aus der Bandgeschwindigkeit und der in den Walzspalt verschobenen Banddicke, das als "Massenflussgröße" bezeichnet wird und sich beim Durchgang des Walzbands B durch das Walzgerüst 10 zum Beispiel analog zu einer einlaufseitigen Dickenstörung oder der Veränderung anderer Prozessgrößen wie zum Beispiel Bandfestigkeit, Spaltreibung und/oder Bandgeschwindigkeit verändert.
Hierbei bezeichnet vi(t) die Bandgeschwindigkeit am Auslauf des Walzgerüsts 10 (gleich der Bandgeschwindigkeit am Eingang eines etwaig nachfolgenden Walzgerüsts 10) als Funktion der Zeit. hi(t) bezeichnet die gemessene Banddicke am Auslauf des Walzgerüsts 10 (gleich der Walzbanddicke am Eingang eines etwaig nachfolgenden Walzgerüsts 10) als Funktion der Zeit. vi-1(t) bezeichnet die bezüglich des Walzgerüsts 10 einlaufseitig gemessene Bandgeschwindigkeit als Funktion der Zeit, und hi(t) bezeichnet die bezüglich des Walzgerüsts 10 einlaufseitig gemessene Banddicke. Die Gleichung gilt für alle Walzgerüste 10 in einer Walzstraße 1, d.h. das "i" in den Bezeichnungen ist eine Ganzzahl zur Durchnummerierung der einzelnen Walzgerüste 10.Here v i (t) denotes the strip speed at the outlet of the roll stand 10 (equal to the strip speed at the entrance of a possibly subsequent roll stand 10) as a function of time. h i (t) denotes the measured strip thickness at the outlet of the roll stand 10 (equal to the roll strip thickness at the entrance to a subsequent roll stand 10) as a function of time. v i-1 (t) denotes the strip speed measured with respect to the roll stand 10 on the entry side as a function of time, and h i (t) denotes the strip thickness measured with respect to the roll stand 10 on the entry side. The equation applies to all roll stands 10 in a rolling train 1, ie the "i" in the designations is an integer for numbering the individual roll stands 10.
Wenn mit hiR(t) eine auslaufseitige Referenzbanddicke und hiDev(t) die auslaufseitige Banddickenabweichung bezeichnet sind, d.h.
Die Referenzbanddicke ist ein Parameter zur Ansteuerung der Walzstraße. So kann die Referenzbanddicke beispielsweise jene Zieldicke sein, die für das Walzband nach Durchlaufen der Walzstraße angestrebt wird, insbesondere wenn sich die Walzstraße nach dem Anfahren in einem stationären oder quasi-stationären Zustand befindet. Die Referenzbanddicke kann beispielsweise im Voraus festgelegt werden, sie kann konstant oder eine Funktion der Zeit und/oder der Bandlänge sein.The reference strip thickness is a parameter for controlling the rolling mill. For example, the reference strip thickness can be the target thickness that is sought for the rolled strip after passing through the rolling mill, in particular if the rolling mill is in a stationary or quasi-stationary state after starting. The reference strip thickness can be determined in advance, for example, it can be constant or a function of time and / or the strip length.
Anstatt nun vi(t) konventionell zu messen, etwa mittels eines Lasers, oder aus Ist-Größen der Walzstraße 1, etwa der Haspelgeschwindigkeit oder Arbeitsrollengeschwindigkeit, zu berechnen, wird zur Berechnung der Massenflussdicke eine Referenzgeschwindigkeit am Auslauf viR(t) verwendet. Dies ist deshalb möglich, weil die Auswirkungen einer Anstellungsänderung des Walzbandes B relativ zum Walzgerüst 10 durch die Zugregelung 22 vernachlässigt werden können. Die Änderung der Auslaufgeschwindigkeit beinhaltet lediglich die durch die Anstellungsänderung hervorgerufene Voreilungsänderung, die auf die absolute Änderung bezogen sehr gering ist, insbesondere in den Geschwindigkeitsbereichen, in denen eine Massenflussregelung durchgeführt wird.Instead of measuring v i (t) conventionally, for example by means of a laser, or using actual values from rolling mill 1, such as the reel speed or work roll speed, a reference speed at the outlet v iR (t) is used to calculate the mass flow thickness. This is possible because the effects of a change in pitch of the rolled strip B relative to the roll stand 10 can be neglected by the
Die Referenzgeschwindigkeit viR(t) kann daher ein Geschwindigkeitsparameter sein, mit dem die Walzstraße 1 angesteuert wird. Auf die Messung oder Berechnung einer Geschwindigkeit unter Versendung einer gemessenen Größe, die der Geschwindigkeit am Auslauf des Walzspalts entspricht, kann daher verzichtet werden. Die Referenzgeschwindigkeit viR(t) kann beispielsweise eine Zielgeschwindigkeit sein, mit der das Walzband B durch die Walzstraße 1 zu transportieren ist, etwa wenn sich die Walzstraße 1 nach dem Anfahren in einem stationären oder quasi-stationären Zustand befindet. Die Referenzgeschwindigkeit viR(t) kann beispielsweise auch ein Geschwindigkeitsparameter sein, mit dem eine Walze, vorzugsweise Arbeitswalze 12 oder Haspel, in der Walzstraße 1 angesteuert wird. Die Referenzgeschwindigkeit kann im Voraus festgelegt werden, sie kann konstant oder eine Funktion der Zeit oder der Bandlänge sein. Die Referenzgeschwindigkeit kann aber muss nicht einen oder mehrere Korrekturwerte aus anderen Regelsystemen enthalten. Diese Korrekturwerte können beispielsweise aus Regelungskorrekturen des Zuges, der Banddicke und/oder aus der Geschwindigkeitsführung bestehen oder berechnet werden.The reference speed v iR (t) can therefore be a speed parameter with which the rolling mill 1 is controlled. The measurement or calculation of a speed by sending a measured quantity that corresponds to the speed at the outlet of the roll gap can therefore be dispensed with. The reference speed v iR (t) can, for example, be a target speed at which the rolling strip B is to be transported through the rolling train 1, for example when the rolling train 1 is in a stationary or quasi-stationary state after starting. The reference speed v iR (t) can, for example, also be a speed parameter with which a roller, preferably a
Daraus folgt die berechnete Banddickenabweichung hiDevCalc(t) im i'ten Walzgerüst 10,
Das Walzband 10 mit der so berechneten Banddickenabweichung hiDevCalc(t) wird dann zum auslaufseitigen Dickenmessgerät 20 geschoben bzw. transportiert. Diese berechnete, zum Dickenmessgerät 20 am Auslauf weitertransportierte Banddickenabweichung wird mit der am Auslauf gemessenen Dickenabweichung verglichen. Der Fehler wird nachgeführt, wobei dies ebenfalls mit der Referenzgeschwindigkeit viR(t) erfolgt.The rolled
Auf diese Weise können Dickenfehler nachgeführt werden, und die Zieldecke am Ende der Walzstraße 1 wird erreicht. Die Differenz zwischen der Istdicke des Walzbandes 10 am Ende der Walzstraße 1 und der Solldicke kann beispielsweise mittels eines PI-Reglers oder PID-Reglers ausgeregelt werden, wie auch durch eine Rückführung über eine Filtereinheit.In this way, thickness errors can be tracked and the target surface at the end of rolling mill 1 is reached. The difference between the actual thickness of the rolled
Gemäß einer weiteren Ausführungsform kann die Massenflussregelung auch ohne Nachführung der auslaufseitigen Dicke betrieben werden, d.h. ausschließlich mit der einlaufseitigen Dicken- und Geschwindigkeitsmessung gemäß:
Hierbei kann bei einer Walzstraße 1 mit mehreren Walzgerüsten 10 (einer Tandemstraße) zusätzlich zu dem Verzicht auf eine auslaufseitige Geschwindigkeitsmessung im ersten Walzgerüst 10 auch auf die auslaufseitige Dickenmessung verzichtet werden. In diesem Fall kann die Dickenregelung im letzten Walzgerüst 10 den Dickenoffset ausregeln, um auf die gewünschte Zieldicke zu kommen. Alle dynamischen Störungen, wie etwa Störungen der Einlaufdicke und/oder Härteschwankungen, können gemäß einer Variante dieser Ausführungsform schon vom ersten Walzgerüst 10 ausgeregelt werden. Obwohl eine Dickenmessung hinter dem ersten Walzgerüst 10 in dieser Variante nicht unbedingt erforderlich ist, kann dennoch ein entsprechendes Dickenmessgerät vorgesehen sein, um bei einem Ausfall der einlaufseitigen Dickenmessung eine Rückfallmöglichkeit bereitzustellen.In this case, in the case of a rolling mill 1 with a plurality of roll stands 10 (a tandem mill), in addition to dispensing with a speed measurement on the exit side in the
Durch die dargelegten Ausführungsformen zur Massenflussdickenregelung kann die Geschwindigkeitsmessung oder Geschwindigkeitsberechnung des Walzbands B am Ausgang eines oder mehrerer Walzgerüste 10 entfallen. Dadurch können Kosten eingespart werden, die andernfalls etwa zur Bereitstellung, Installation, Wartung usw. entsprechender Sensoren und Steuereinheiten anfallen würden. Die Regelung wird weniger durch Messfehler beeinträchtigt, die insbesondere bei einer Messung der Geschwindigkeit am Auslauf des ersten Walzgerüsts 10 auftreten können, etwa aufgrund des Schlupfes zwischen Walzgut und Messrolleneinheit, Emulsion/Öl auf dem Messgut, Dampf oder Platzmangel, beispielsweise wenn ein Laser zur Messung verwendet wird. Die Zuverlässigkeit der Dickenregelung wird erhöht, was sich wiederrum positiv auf die Güte des herzustellenden Walzprodukts auswirkt. Insbesondere auch bei Anlagen mit schwierigen Einbausituationen ermöglicht der dargestellte Ansatz eine Dickenregelung mit hoher Dynamik und direkter Reaktion im Walzspalt.Due to the described embodiments for mass flow thickness control, the speed measurement or speed calculation of the rolled strip B at the outlet of one or more roll stands 10 can be omitted. This can save costs that would otherwise be incurred for the provision, installation, maintenance, etc. of corresponding sensors and control units. The control is less affected by measurement errors, which can occur in particular when measuring the speed at the outlet of the
Die Steuerung bzw. Regelung ist besonders bevorzugt anwendbar für Kaltwalzstraßen zum Walzen bandförmiger Metallmaterialien, insbesondere von Metallbändern aus Stahl oder Nichteisenmetallen, den sogenannten NE-Metallen.The control or regulation is particularly preferably applicable for cold rolling mills for rolling strip-shaped metal materials, in particular metal strips made of steel or non-ferrous metals, the so-called non-ferrous metals.
Soweit anwendbar, können alle einzelnen Merkmale, die in den Ausführungsbeispielen dargestellt sind, miteinander kombiniert und/oder ausgetauscht werden, ohne den Bereich der Erfindung zu verlassen.As far as applicable, all individual features that are shown in the exemplary embodiments can be combined and / or exchanged with one another without leaving the scope of the invention.
- 11
- Walzstraßerolling train
- 22
- Abwickelhaspeldecoiler
- 33
- Aufwickelhaspelrecoiler
- 1010
- Walzgerüstrolling mill
- 1111
- Stützwalzesupporting roll
- 1212
- ArbeitswalzeStripper
- 2020
- Dickenmessgerätthickness gauge
- 2222
- ZugregelungTension control
- 3030
- Dicken-SteuergerätThickness control device
- 3131
- Spalt-SteuergerätGap control device
- 3232
- Zug-SteuergerätTrain control unit
- 3333
- Antriebs-SteuergerätDrive controller
- BB
- Walzbandrolled strip
- RR
- Transportrichtungtransport direction
Claims (13)
- Method of controlling a rolling train (1), preferably a cold-rolling train, which comprises one or more roll stands (10) each with two working rolls (12) forming a rolling gap through which a strip (B) to be rolled is transportable, wherein one or both working rolls (12) is or are movable so that the rolling gap is settable, and the method comprises:providing a reference speed which is a parameter for drive control of the rolling train (1);measuring the speed of the rolled strip (B) prior to entry into the rolling gap; andmeasuring the thickness of the rolled strip (B) prior to entry into the rolling gap;characterised in that the method further comprises:
setting the rolling gap of one or more roll stands (10) in the rolling train (1) on the basis of the measured speed and thickness prior to entry into the rolling gap as well as of the reference speed, so that the control is carried out without consideration of an exit-side strip speed which is possibly measured or calculated from actual variables of the rolling train. - Method according to claim 1, characterised in that the reference speed corresponds with a target speed at which the rolled strip (B) is to be transported through the rolling train (1) or is a speed parameter by which a roll, preferably working roll (12), deflecting roller or coiler, in the rolling train (1) is to be controlled.
- Method according to claim 1 or 2, characterised in that a reference strip thickness, which is a parameter for control of the rolling train (1), is provided and for setting the rolling gap a thickness difference of the rolled strip (B) is calculated with consideration of the reference speed and the reference strip thickness.
- Method according to claim 3, characterised in that the reference speed for calculation of the thickness difference of the rolled strip (B) is determined with consideration of one or more correction values from a regulation of the tension, the strip thickness, one or more drive moments and/or the speed management.
- Method according to claim 3 or 4, characterised in that the reference speed for calculation of the thickness difference of the rolled strip (B) is calculated from a target speed and with consideration of one or more additional variables, preferably the target thickness and/or the decrease in rolling roughness and/or the rolling force and/or the target tension.
- Method according to claim 5, characterised in that the additional variable is a forward slip which is defined as the ratio of the linear speed of the working roll (12) to the exit speed of the rolled strip (B)
- Method according to claim 6, characterised in that the forward slip is calculated, wherein the forward slip is calculated with consideration of different plant states prior to the start of and/or during the rolling process.
- Method according to any one of claims 3 to 7, characterised in that the exit-side strip thickness is measured, a measured thickness difference is determined therefrom and the measured thickness difference is compared with the calculated thickness difference.
- Method according to any one of claims 3 to 8, characterised in that the reference strip thickness is a target strip thickness desired for the rolled strip (B) after running through the rolling train (1).
- Method according to any one of claims 3 to 9, characterised in that the rolling train (1) comprises a plurality of roll stands (10), wherein the thickness of the rolled strip (B) is measured behind the last roll stand (10) and the reference strip thickness is used for setting the rolling gap of one or more roll stands (10), so that with respect thereto a measurement of the exit-side strip thickness is dispensed with.
- Device for controlling a rolling train (1), preferably cold-rolling train, which is arranged to perform a method according to any one of claims 1 to 10.
- Rolling train (1), preferably cold-rolling train, which comprises a device according to claim 11 as well as one or more roll stands (10) each with two working rolls (12) forming a rolling gap through which a strip (B) to be rolled is transportable, wherein one or both working rolls (12) is or are movable relative to the other so that the rolling gap is settable.
- Rolling train according to claim 12, characterised in that this is of the type of a reversing plant with directional change in the strip guidance.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US15/665,806 US10799924B2 (en) | 2017-08-01 | 2017-08-01 | Mass flow regulation in roller devices |
Publications (2)
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EP3437748A1 EP3437748A1 (en) | 2019-02-06 |
EP3437748B1 true EP3437748B1 (en) | 2020-02-12 |
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EP18181081.3A Active EP3437748B1 (en) | 2017-08-01 | 2018-07-02 | Mass flow rate regulation in rolling mill plants |
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US (1) | US10799924B2 (en) |
EP (1) | EP3437748B1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111069300B (en) * | 2019-12-30 | 2021-07-09 | 新疆八一钢铁股份有限公司 | Production method of cold-rolled super-thick high-precision motor casing steel |
KR102679773B1 (en) * | 2020-09-04 | 2024-06-28 | 가부시키가이샤 티마이크 | Control system of tandem cold rolling mill |
DE102022202987A1 (en) * | 2022-03-25 | 2023-09-28 | Sms Group Gmbh | Operating procedures for a rolling mill |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3787667A (en) * | 1971-01-06 | 1974-01-22 | Gen Electric | Computer controlled metal rolling mill |
DE3371749D1 (en) * | 1982-11-11 | 1987-07-02 | Davy Mckee Sheffield | Rolling mill control for tandem rolling |
JPS6149772A (en) * | 1984-08-13 | 1986-03-11 | Tamura Seisakusho Co Ltd | Flux surface control device |
JPS6149722A (en) * | 1984-08-20 | 1986-03-11 | Nippon Kokan Kk <Nkk> | Plate thickness controlling method of steel strip |
JPH0446622A (en) | 1990-06-14 | 1992-02-17 | Toshiba Corp | Device for controlling sheet thickness on rolling mill |
JPH05169126A (en) * | 1991-12-26 | 1993-07-09 | Siemens Ag | Method for controlling cold strip rolling mill |
DE10254178B4 (en) * | 2002-11-21 | 2011-10-13 | Abb Ag | Method for determining state variables of a rolling process |
DE10327663A1 (en) | 2003-06-20 | 2005-01-05 | Abb Patent Gmbh | System and method for optimizing control of the thickness quality in a rolling process |
DE102009012028A1 (en) | 2009-03-10 | 2010-09-23 | Converteam Gmbh | Method for operating a rolling train, in particular a cold rolling mill |
EP2298461A1 (en) | 2009-09-17 | 2011-03-23 | Siemens Aktiengesellschaft | Cold roller path with mass flow regulation on a roller frame |
EP2620233A1 (en) * | 2012-01-24 | 2013-07-31 | Siemens Aktiengesellschaft | Method for processing milled goods in a hot rolling mill |
-
2017
- 2017-08-01 US US15/665,806 patent/US10799924B2/en active Active
-
2018
- 2018-07-02 EP EP18181081.3A patent/EP3437748B1/en active Active
Non-Patent Citations (1)
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EP3437748A1 (en) | 2019-02-06 |
US10799924B2 (en) | 2020-10-13 |
US20190039107A1 (en) | 2019-02-07 |
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