EP3362199B1 - Method for rolling a rolling material and rolling mill - Google Patents
Method for rolling a rolling material and rolling mill Download PDFInfo
- Publication number
- EP3362199B1 EP3362199B1 EP16778843.9A EP16778843A EP3362199B1 EP 3362199 B1 EP3362199 B1 EP 3362199B1 EP 16778843 A EP16778843 A EP 16778843A EP 3362199 B1 EP3362199 B1 EP 3362199B1
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- EP
- European Patent Office
- Prior art keywords
- rolling
- rotational speed
- roll
- work roll
- speed
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- 238000005096 rolling process Methods 0.000 title claims description 310
- 239000000463 material Substances 0.000 title claims description 50
- 238000000034 method Methods 0.000 title claims description 24
- 230000001105 regulatory effect Effects 0.000 claims description 26
- 238000005266 casting Methods 0.000 claims description 21
- 238000011144 upstream manufacturing Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims 9
- 230000003466 anti-cipated effect Effects 0.000 claims 6
- 238000010079 rubber tapping Methods 0.000 description 21
- 230000006870 function Effects 0.000 description 10
- 230000008569 process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000013072 incoming material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000007704 transition 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
- B21B37/46—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
- B21B37/72—Rear end control; Front end control
-
- 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
Definitions
- the invention relates to a method for rolling a rolling stock in a rolling mill with at least one roll stand, wherein a gap height of a roll gap arranged between work rolls of the roll stand before contact of the rolling stock with these work rolls is set to be less than an inlet thickness of the rolling stock, at least one driven work roll of the Roll stand is operated at a target rotation speed after the rolling stock has reached the roll gap, and wherein the driven work roll is operated at a pilot rotation speed deviating from the target rotation speed until the rolling stock reaches the roll gap.
- the invention further relates to a rolling mill for rolling a rolling stock, comprising at least one rolling stand and at least one control and / or regulating unit which controls the rolling stand, the control and / or regulating electronics being set up, a gap height of a roll gap arranged between work rolls of the rolling stand to set a contact of the rolling stock with these work rolls smaller than an inlet thickness of the rolling stock, to operate at least one driven work roll of the roll stand at a target rotation speed after the rolling stock has reached the roll gap and to operate the driven work roll at a pilot control rotation speed that deviates from the target rotation rate until that Rolled material reaches the roll gap.
- the EP 2 796 217 A1 shows a method and a corresponding device for rolling a rolling stock in a rolling mill with at least one roll stand, wherein at least one driven work roll of the roll stand is operated at a target rotation speed after the rolling stock has reached the roll gap, and wherein the driven work roll at a target rotation speed deviating pilot control rotation speed is operated until the rolling stock reaches the roll gap.
- rolling metal rolling stock also called slab
- speed and mass flow disturbances occur when rolling begins in a roll stand of a rolling mill.
- a rolling torque build-up which is required for the targeted forming of the rolling stock material, is connected to a rolling force build-up.
- Forming torque is applied by a work roll drive of the roll stand.
- a work roll of a roll stand waits for the rolling stock at a rotational speed v 0 required for a stationary forming process. If the rolling stock enters a roll gap of the roll stand, the work roll drive of the roll stand takes over the forming moment. Due to the usual regulation of the speed of work rolls of the roll stand, the speed of rotation of the work rolls is briefly reduced until the speed control has set the required target speed again. A material build-up then occurs in front of the roll stand, which should be absorbed by the installation of a mass flow control and tension control. For this purpose, for example, tension measuring rollers or loop lifters are used, with the help of which control devices adjust the rotational speeds of the work rolls of neighboring rolling stands until constant mass flow conditions and constant tension conditions are regained.
- a common measure for reducing the requirements for the disturbance behavior of the mass flow control at the start of rolling is to pre-control the drop in rotational speed at the start of rolling.
- a work roll or the drive of the work roll of a roll stand rotates before the start of rolling by a speed ⁇ v faster than under stationary rolling conditions.
- this excess speed ⁇ v is switched off and the roll stand is given the speed under steady-state conditions. This ensures that the material jam on the inlet side of the roll stand is largely eliminated.
- This procedure is also known as train building aid. It is often accepted that the train in the preceding process section is at a high level after tapping, but usually represents an increased process reliability.
- the drop in speed on the work rolls of a roll stand and thus the pent-up length of the rolling stock in front of the roll stand depends on the speed controller settings (constant in normal operation) and on the rolling conditions and the required rolling torque.
- the drop in speed is large, as is the required precontrol of the speed of rotation of the work roll.
- the difficulty of the train building aid is to precisely predict the amount of the rotational speed pilot control ⁇ v and the optimal time sequence.
- a rolling stand When tapping a rolling stock, taking the expected rolling force into account, a rolling stand can be placed in front of the required tapping position in such a way that the desired outlet thickness of the rolling stock is generated directly after the roll gap is filled with the material of the incoming rolling stock and the rolling force build-up.
- This opening of the rolling stand from the advance position to the rolling position also leads to a contribution to the mass balance in the roll gap when the rolling stock is tapped and further accelerates the incoming material of the rolling stock.
- This acceleration of the incoming rolling stock material is superimposed on the braking of the work roll drive. In many cases, the acceleration effect is subordinate. However, there are also cases in which the pulling of the rolled material into the roll gap or the acceleration effect can be dominated and observed, for example in the first roll stand of CSP (Compact Strip Production) systems.
- One application with particular relevance to the drawing-in conditions are new plant concepts for continuous plants (coupled casting and rolling) in which large slab thicknesses of, for example, 70 mm to 160 mm thickness are to be cast and rolled out.
- the slab head is moved through the open first roll stand of a rolling mill at the start of rolling in order to prevent the sprue from being able to be rolled out due to unfavorable temperature conditions and cast-in cold strand components Let the slab head through.
- the first three roll stands of the rolling mill then touch the slab after passing through the strip head and close to the required intermediate thickness within a few seconds. Due to the large thicknesses at the slab head, the material of the slab head cannot be rolled out to the desired target thickness or the wedge generated in the process must be separated and discharged, which reduces the output of an endless system.
- the slab head of an endless slab is to be rolled directly in the first rolling stand of a multi-stand rolling mill.
- the non-rollable section of the slab head is cut off behind the casting machine in front of the first rolling stand, for example using scissors.
- the first rolling stand is connected to the casting machine via the endless slab.
- a tapping of a rolling stock in a rolling stand is defined so that the roll gap height before the rolling stock enters the roll gap is less than the inlet thickness of the incoming endless slab.
- the tapping at the slab head of the continuous slab ensures that the required thickness reduction is set at the beginning of the slab and the cutting of material or the production of strip areas with transition thicknesses is avoided, which increases the output of the endless system.
- An object of the invention is to largely reduce tensile changes and / or changes in mass flow in a rolling stock entering a rolling stand while a rolling head of the rolling stock is tapped with the rolling stand.
- a gap height of a roll gap arranged between work rolls of the rolling stand before contact of the rolling stock with these work rolls is set to be less than an inlet thickness of the rolling stock
- at least one driven work roll of the rolling stand being set with one Desired rotational speed is operated after the rolling stock has reached the roll gap, and wherein the driven work roll is operated at a pre-control rotational speed deviating from the desired rotating speed until the rolling stock reaches the rolling gap.
- the pilot rotation speed is varied from the contact of the rolling stock with the driven work roll in such a way that the pilot rotation speed increases monotonously or falls monotonously.
- the precontrol rotation speed of the driven work roll deviating from the desired rotation speed is varied from a first contact of the rolling stock entering the roll stand with the work roll until the point in time at which the rolling stock has reached the roll gap.
- the roll gap is to be understood as the shortest distance between the driven work roll and a work roll interacting therewith.
- a rolling stock head of the rolling stock is already replaced by the Work rolls are reshaped until the roll gap is filled with the rolling stock, which in the present case means reaching the roll gap.
- the pilot rotation speed is higher than the target rotation speed, the pilot rotation speed is varied from the contact of the rolling stock with the driven work roll in such a way that the pilot rotation speed drops monotonously.
- the pilot rotation speed is lower than the target rotation speed, the pilot rotation speed is varied from the contact of the rolling stock with the driven work roll such that the pilot rotation speed increases monotonously. As a result, largely reduced train changes and / or changes in mass flow are generated in the area in front of the roll stand, even with almost no train present.
- a driven work roll of the first roll stand of a rolling mill can rotate before or at the start of rolling more slowly or faster than the target rotational speed.
- endless rolling CEM, USP
- the driven work rolls of the first three roll stands can rotate before or at the start of rolling more slowly or faster than the target rotational speed assigned to the respective roll stand.
- the driven work rolls of the first two roll stands can rotate before or at the start of rolling more slowly or faster than the target rotational speed assigned to the respective roll stand.
- the variation of the precontrol rotation speed according to the invention from the first contact of the incoming rolling stock with the driven work roll can take place over a defined period of time, for example using a ramp function or another monotonically increasing or monotonously decreasing function.
- the variation of the pre-control rotation speed therefore begins with the first contact of the incoming rolling stock with the driven work roll.
- the variation of the pre-control rotational speed is preferably adapted to the conditions in the roll gap. A good compensation can be achieved if the period of the variation of the pilot rotation speed is adapted to the period that begins with the first contact between the incoming rolling stock and the driven work roll and ends when the rolling stock has reached the roll gap.
- the variation of the precontrol rotation speed is advantageously selected such that an expected length disturbance ⁇ l in front of the roll stand is compensated for.
- This length disturbance is made up of a constant part from the pulling behavior of the rolling stock into the roll gap and a load-dependent, i.e. torque-dependent part for the drop in rotational speed on the driven work roll and an opening of the preceding roll gap.
- the compensation length results from the integral balancing of the area between the point in time at which the rolling stock comes into first contact with the driven work roll and the point in time at which the rolling stock reaches or fills the roll gap and the pre-control rotational speed specification relative to the value the target rotation speed.
- the invention can be implemented with very little effort and does not require any additional space for alternative internals to maintain a constant mass flow, such as a loop storage device to compensate for mass flow disturbances, which would have to be designed for a rolling stock thickness of up to 120 mm.
- a loop storage device to compensate for mass flow disturbances, which would have to be designed for a rolling stock thickness of up to 120 mm.
- no increased material waste is generated in the method according to the invention, since the rolling stock including its rolling stock head is completely rolled.
- the invention enables a reduction in the demands on the speed of a mass flow control between a casting machine and the first roll stand of a multi-stand rolling mill of an endless system, the mass flow control being able to compensate for almost stationary conditions and being relieved for the relatively fast tapping in the first roll stand.
- a rolling stock in the form of a slab, in particular an endless slab can be rolled.
- the rolling mill can also have two or more roll stands. Since, according to the invention, the gap height of the roll gap arranged between work rolls of the roll stand is set to be smaller than an inlet thickness of the rolling stock before the rolling stock comes into contact with it, the rolling stock is rolled from its rolling stock head and thus completely, which reduces material waste compared to systems in which the Rolled material head first passed through open rolling stands and then separated from the remaining rolled material. Both working rolls of the roll stand coming into contact with the rolling stock can also be driven accordingly, wherein a speed of rotation of the respective working roll can be controlled and / or regulated according to the invention.
- the target rotational speed is coordinated with operation of the roll stand after tapping the rolling stock under constant or stationary rolling conditions.
- the contact of the rolling stock with the driven one A suitable sensor system can be used to detect the work roll and / or the rolling gap reaching the roll gap. For example, at least one of these rolling conditions can be detected by detecting the rolling force currently present on the roll stand by assigning a predetermined rolling force value to the respective rolling condition and comparing the rolling force value currently detected with the predetermined rolling force value.
- the precontrol rotation speed is varied from the contact of the rolling stock with the driven work roll by means of a precontrol function which is determined at least taking into account an expected rolling force and / or an expected rolling torque and / or an infeed speed of the rolling stock and / or the roll gap geometry ,
- a precontrol function which is determined at least taking into account an expected rolling force and / or an expected rolling torque and / or an infeed speed of the rolling stock and / or the roll gap geometry .
- the pre-control rotation speed is specified such that from the contact of the rolling stock with the driven work roll until the stationary target rotation speed is reached, the time integral between the pre-control rotation speed and the stationary target rotation speed results in an area that describes a predefinable compensation length that the expected one Mass flow disturbance at the nip entry at the beginning of the rolling corresponds.
- the compensation length is preferably calculated from the area.
- the compensation length can be calculated taking into account the speed of rotation of the work roll and other parts influencing the mass flow at the start of rolling.
- the compensation length can in particular be below Taking into account the speed of rotation of the work roll at the start of rolling, the drawing-in behavior from the contact of the rolling stock with the work roll and the vertical movement of the interacting work rolls at the tapping.
- the precontrol rotation speed is predetermined such that the monotonous course of the precontrol rotation speed extends in time within a roll gap filling time, which begins when the rolling stock comes into contact with the driven work roll and ends when the stationary target rotation speed is reached.
- the length of the roll gap filling time is preferably chosen to be greater than 50 ms.
- a rolling stock speed of the rolling stock is measured at a stand inlet of the rolling stand and is taken into account in the variation of the pre-control rotation speed from the contact of the rolling stock with the driven work roll.
- a fault that remains despite the rotational speed precontrol which can be caused, for example, by changing and unknown friction conditions in the roll gap, can be further reduced by measuring the actual rolling stock speed at the stand inlet and adjusting the variation of the precontroling rotational speed of the driven work roll, taking into account the measured rolling stock speed.
- a current consumption of casting machine drives of a casting machine upstream of the rolling mill is taken into account in the variation of the precontrol rotation speed from the contact of the rolling stock with the driven work roll.
- a fault that remains despite the rotational speed precontrol which can be caused, for example, by changing and unknown friction conditions in the roll gap, can be measured by measuring the current consumption of the casting machine drives and adapting the variation of the pilot rotation speed of the driven work roll can be further reduced taking into account the measured current consumption.
- a rolling mill according to the invention for rolling a rolling stock comprises at least one rolling stand and at least one control and / or regulating unit which controls the rolling stand, the control and / or regulating electronics being set up, a gap height of a roll gap arranged between work rolls of the rolling stand before contact of the rolling stock with to set these work rolls to be smaller than an inlet thickness of the rolling stock, to operate at least one driven work roll of the roll stand at a target rotation speed after the rolling stock has reached the roll gap, and to operate the driven work roll at a pilot control rotation speed which deviates from the target rotation speed until the rolling stock reaches the roll gap ,
- the control and / or regulating electronics are set up to vary the precontrol rotation speed from the contact of the rolling stock with the driven work roll in such a way that the precontrol rotation speed increases monotonously or decreases monotonously.
- the rolling mill can be used to carry out the method according to one of the above-mentioned configurations or any combination of at least two of these configurations with one another.
- the rolling mill can also have two or more rolling stands which can be controlled by the control and / or regulating unit.
- the control and / or regulating unit can have at least one data processing unit, for example a microprocessor, and at least one data memory.
- control and / or regulating electronics are set up to control the precontrol rotation speed from the contact of the rolling stock with the driven work roll by means of a precontrol function vary and determine in advance the pilot control function at least taking into account an expected rolling force and / or an expected rolling torque and / or an infeed speed of the rolling stock.
- control and / or regulating electronics are set up to predefine the pilot rotation speed in such a way that from the contact of the rolling stock with the driven work roll until the stationary target rotational speed is reached, the time integral between the pilot rotation speed and the stationary target rotational speed results in an area, which describes a predefinable compensation length that corresponds to the expected mass flow disturbance at the roll gap entry at the start of rolling.
- the control and / or regulating electronics are preferably set up to calculate the compensation length from the area.
- the control and / or regulating electronics can be set up, the compensation length can be calculated taking into account the speed of rotation of the work roll and other components influencing the mass flow at the start of the rolling process.
- control and / or regulating electronics can be set up, the compensation length can be calculated in particular taking into account the speed of rotation of the work roll at the start of rolling, the drawing-in behavior from the contact of the rolling stock with the work roll and the vertical movement of the interacting work rolls when tapping.
- control and / or regulating electronics is set up to specify the pilot rotation speed in such a way that the monotonous course of the pilot rotation speed occurs within a roll gap filling time which begins with the contact of the rolling stock with the driven work roll and with the stationary station being reached Target rotational speed ends, extends.
- the length of the roll gap filling time is preferably greater than 50 ms.
- the rolling mill comprises at least one measuring unit, which is arranged on a stand inlet of the rolling stand and is connected to the control and / or regulating unit, for measuring a rolling stock speed of the rolling stock at the stand inlet, the control and / or regulating unit being set up to measure the measured Rolling material speed to be taken into account in the variation of the pre-control rotation speed from the contact of the rolling material with the driven work roll.
- control and / or regulating unit is set up to take into account a measured current consumption of casting machine drives of a casting machine upstream of the rolling mill when varying the pre-control rotation speed from the contact of the rolling stock with the driven work roll.
- Figure 1 shows an exemplary representation of a rotational speed curve in a conventional rolling mill without rotational speed precontrol.
- the rotational speed v of a driven work roll of a roll stand of the rolling mill is plotted against the time t.
- a rolling stock is tapped with the roll stand.
- the actual rotational speed v Ist is shown, with a temporary decrease in the actual rotational speed v Ist being seen from the tapping.
- the tapping the rolled material is accumulated, resulting in the length of the accumulated rolled material from the area F between the target rotation speed v 0 and the actual rotation speed v actual .
- FIG 2 shows an exemplary representation of a rotational speed curve in a conventional rolling mill with rotational speed precontrol.
- the rotational speed v of a driven work roll of a roll stand of the rolling mill is plotted against the time t.
- a rolling stock is tapped with the roll stand.
- the driven working roll is up to a time t E with a feedforward control rotation speed operated v v, v .DELTA.v to higher than the target rotation speed 0.
- From the time t E is adjusted 0 the feedforward rotational speed v v v of the target rotational speed.
- the actual speed of rotation v Ist is also shown.
- the drop in rotational speed when tapping of the rolling stock with the rolling stand is compensated by this rotational speed precontrol.
- FIG 3 shows a schematic representation of speed ratios when tapping a rolling stock with a conventional rolling mill 1, of which in Figure 3 only a driven work roll 2 of a roll stand of the rolling mill 1, which is not shown further, is shown.
- a rolling stock 3 runs into the roll stand at an inlet thickness h 1 and an inlet speed v 1 and comes into contact with the driven work roll 2 at the time t 1.
- the driven work roll 2 rotates at the rotational speed v 0 and a torque M Roll ( t).
- the rolling stock 3 reaches the roll gap with the gap height h 2 .
- the mass flow conditions when tapping in the roll stand are complex and cannot be described solely by the speed behavior of the drive of the driven work roll 2.
- the head section of the rolling stock 3 abutting the work roll 2 is accelerated by the high surface speed of the work roll 2 and drawn faster into the roll gap.
- the roll gap is completely filled.
- This effect depends on the friction conditions in the roll gap and the roll gap geometry, but not on the rolling moment that occurs.
- FIG. 4 shows an exemplary representation of a rotational speed curve in an embodiment for a rolling mill according to the invention.
- the rotational speed v of a driven work roll of a roll stand of the rolling mill is plotted against the time t.
- a rolling stock entering the roll stand comes into contact with the driven work roll, as shown in FIG Figure 3 is shown.
- the rolling stock reaches the roll gap.
- a gap height of a roll gap arranged between work rolls of the roll stand before the rolling stock comes into contact with these work rolls is set smaller than an inlet thickness of the rolling stock, as is shown in Figure 3 is shown.
- the driven work roll of the roll stand is operated at a target rotational speed v 0 after the rolling stock has reached the roll gap.
- the driven work roll is driven by one of the target rotation speed v 0 deviating feedforward rotational speed v v until the rolling stock reaches the nip, wherein the feedforward control rotational speed v v to ⁇ v is lower than the target rotation speed v 0th
- the pilot rotation speed v v is varied from the contact of the rolling stock with the driven work roll over a period t v such that the pilot rotation speed v v increases monotonously.
- the precontrol rotation speed v v is varied from the contact of the rolling stock with the driven work roll by means of a precontrol function, which takes into account at least an expected rolling force and / or an expected rolling torque and / or a running-in speed of the rolling stock and / or the roll gap geometry, in particular in Dependency of the inlet thickness of the rolling stock and the roll gap height is determined.
- the area F v between the target rotation speed v 0 and the pilot rotation speed v v between the times t 1 and t 2 is proportional to the length disturbance due to the tapping of the rolling stock with the roll stand.
- the precontrol rotation speed can be specified such that from the contact of the rolling stock with the driven work roll until the stationary target rotation speed is reached, the time integral between the precontrol rotation speed and the stationary target rotation speed results in an area that describes a predefinable compensation length that corresponds to the expected mass flow disturbance at the roll gap entry Beginning of rolling corresponds.
- the compensation length can be calculated from the area.
- the compensation length can be calculated taking into account the speed of rotation of the work roll and other components that influence the mass flow at the start of the rolling process.
- the compensation length can be calculated, in particular, taking into account the speed of rotation of the work roll at the start of rolling, the drawing-in behavior from the contact of the rolling stock with the work roll and the vertical movement of the cooperating work rolls when tapping.
- the precontrol rotation speed can be specified such that the monotonous course of the precontrol rotation speed (v v ) occurs over time within a roll gap filling time which begins when the rolling stock (3) comes into contact with the driven work roll (2) and when the stationary target rotation speed (v 0 ) ends, extends.
- the length of the roll gap filling time can be selected to be greater than 50 ms.
- a rolling stock speed of the rolling stock can be measured at a stand inlet of the rolling stand and taken into account in the variation of the pre-control rotation speed from the contact of the rolling stock with the driven work roll.
- a variation in the precontrol rotation speed from the contact of the rolling stock with the driven work roll can take into account a current consumption of casting machine drives of a casting machine upstream of the rolling mill.
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Description
Die Erfindung betrifft ein Verfahren zum Walzen eines Walzguts in einem Walzwerk mit wenigstens einem Walzgerüst, wobei eine Spalthöhe eines zwischen Arbeitswalzen des Walzgerüsts angeordneten Walzspalts vor einem Kontakt des Walzguts mit diesen Arbeitswalzen kleiner als eine Einlaufdicke des Walzguts eingestellt wird, wobei wenigstens eine angetriebene Arbeitswalze des Walzgerüsts mit einer Solldrehgeschwindigkeit betrieben wird, nachdem das Walzgut den Walzspalt erreicht hat, und wobei die angetriebene Arbeitswalze mit einer von der Solldrehgeschwindigkeit abweichenden Vorsteuerungsdrehgeschwindigkeit betrieben wird, bis das Walzgut den Walzspalt erreicht.The invention relates to a method for rolling a rolling stock in a rolling mill with at least one roll stand, wherein a gap height of a roll gap arranged between work rolls of the roll stand before contact of the rolling stock with these work rolls is set to be less than an inlet thickness of the rolling stock, at least one driven work roll of the Roll stand is operated at a target rotation speed after the rolling stock has reached the roll gap, and wherein the driven work roll is operated at a pilot rotation speed deviating from the target rotation speed until the rolling stock reaches the roll gap.
Die Erfindung betrifft des Weiteren ein Walzwerk zum Walzen eines Walzguts, aufweisend wenigstens ein Walzgerüst und wenigstens eine das Walzgerüst ansteuernde Steuer- und/oder Regeleinheit, wobei die Steuer- und/oder Regelelektronik eingerichtet ist, eine Spalthöhe eines zwischen Arbeitswalzen des Walzgerüsts angeordneten Walzspalts vor einem Kontakt des Walzguts mit diesen Arbeitswalzen kleiner als eine Einlaufdicke des Walzguts einzustellen, wenigstens eine angetriebene Arbeitswalze des Walzgerüsts mit einer Solldrehgeschwindigkeit zu betreiben, nachdem das Walzgut den Walzspalt erreicht hat und die angetriebene Arbeitswalze mit einer von der Solldrehgeschwindigkeit abweichenden Vorsteuerungsdrehgeschwindigkeit zu betreiben, bis das Walzgut den Walzspalt erreicht.The invention further relates to a rolling mill for rolling a rolling stock, comprising at least one rolling stand and at least one control and / or regulating unit which controls the rolling stand, the control and / or regulating electronics being set up, a gap height of a roll gap arranged between work rolls of the rolling stand to set a contact of the rolling stock with these work rolls smaller than an inlet thickness of the rolling stock, to operate at least one driven work roll of the roll stand at a target rotation speed after the rolling stock has reached the roll gap and to operate the driven work roll at a pilot control rotation speed that deviates from the target rotation rate until that Rolled material reaches the roll gap.
Die
Beim Walzen von metallischem Walzgut, auch Bramme genannt, in gekoppelten Prozessen kommt es zu Geschwindigkeitsstörungen und Massenflussstörungen, wenn das Walzen in einem Walzgerüst eines Walzwerks beginnt. Mit einem Walzkraftaufbau ist ein Walzmomentenaufbau verbunden, der zur gezielten Umformung des Walzgutmaterials erforderlich ist. Das Walzmoment bzw.When rolling metal rolling stock, also called slab, in coupled processes, speed and mass flow disturbances occur when rolling begins in a roll stand of a rolling mill. A rolling torque build-up, which is required for the targeted forming of the rolling stock material, is connected to a rolling force build-up. The rolling moment or
Umformmoment wird durch einen Arbeitswalzenantrieb des Walzgerüsts aufgebracht.Forming torque is applied by a work roll drive of the roll stand.
Üblicherweise wartet eine Arbeitswalze eines Walzgerüsts mit einer für einen stationären Umformprozess erforderlichen Drehgeschwindigkeit v0 auf das Walzgut. Tritt das Walzgut in einen Walzspalt des Walzgerüsts ein, übernimmt der Arbeitswalzenantrieb des Walzgerüsts das Umformmoment. Aufgrund einer üblichen Regelung der Drehzahl von Arbeitswalzen des Walzgerüsts tritt hierbei eine kurzfristige Verringerung der Drehgeschwindigkeit der Arbeitswalzen auf, bis die Drehzahlregelung die erforderliche Solldrehgeschwindigkeit wieder eingestellt hat. Vor dem Walzgerüst kommt es dann zu einem Materialaufstau, der von Einbauten einer Massenflussregelung und Zugregelung aufgefangen werden sollte. Hierfür werden beispielsweise Zugmessrollen oder Schlingenheber eingesetzt, mit deren Hilfe Regelungseinrichtungen die Drehgeschwindigkeiten der Arbeitswalzen von benachbarten Walzgerüsten so lange anpassen, bis konstante Massenflussverhältnisse und konstante Zugverhältnissen wiedererlangt sind.Usually, a work roll of a roll stand waits for the rolling stock at a rotational speed v 0 required for a stationary forming process. If the rolling stock enters a roll gap of the roll stand, the work roll drive of the roll stand takes over the forming moment. Due to the usual regulation of the speed of work rolls of the roll stand, the speed of rotation of the work rolls is briefly reduced until the speed control has set the required target speed again. A material build-up then occurs in front of the roll stand, which should be absorbed by the installation of a mass flow control and tension control. For this purpose, for example, tension measuring rollers or loop lifters are used, with the help of which control devices adjust the rotational speeds of the work rolls of neighboring rolling stands until constant mass flow conditions and constant tension conditions are regained.
In Warmwalzwerken und Kaltwalzwerken ist eine gängige Maßnahme zum Verringern der Anforderungen an das Störverhalten der Massenflussregelung bei Walzbeginn eine Vorsteuerung des Drehgeschwindigkeitseinbruchs bei Walzbeginn. Dabei dreht sich eine Arbeitswalze bzw. der Antrieb der Arbeitswalze eines Walzgerüsts vor Walzbeginn um eine Geschwindigkeit Δv schneller als unter stationären Walzbedingungen. Mit dem Anstich des Walzguts im Walzgerüst und dem sich dabei einstellenden Drehzahleinbruch an dessen Arbeitswalze wird diese Übergeschwindigkeit Δv weggeschaltet und das Walzgerüst bekommt die Vorgabe der Geschwindigkeit unter stationären Bedingungen. Hierdurch wird erreicht, dass der Materialstau auf der Einlassseite des Walzgerüsts weitgehend eliminiert wird. Dieses Vorgehen wird auch als Zugaufbauhilfe bezeichnet. Hierbei wird häufig in Kauf genommen, dass der Zug im voranliegenden Prozessabschnitt nach dem Anstich auf hohem Niveau liegt, üblicherweise damit aber eine erhöhte Prozesssicherheit darstellt.In hot rolling mills and cold rolling mills, a common measure for reducing the requirements for the disturbance behavior of the mass flow control at the start of rolling is to pre-control the drop in rotational speed at the start of rolling. Here, a work roll or the drive of the work roll of a roll stand rotates before the start of rolling by a speed Δv faster than under stationary rolling conditions. With the tapping of the rolling stock in the roll stand and the resulting drop in speed at its work roll, this excess speed Δv is switched off and the roll stand is given the speed under steady-state conditions. This ensures that the material jam on the inlet side of the roll stand is largely eliminated. This procedure is also known as train building aid. It is often accepted that the train in the preceding process section is at a high level after tapping, but usually represents an increased process reliability.
Es ist bekannt, dass der Drehzahleinbruch an den Arbeitswalzen eines Walzgerüsts und damit die aufgestaute Walzgutlänge vor dem Walzgerüst abhängig von den Drehzahlreglereinstellungen (konstant im normalen Betrieb) und von den Walzbedingungen und dem erforderlichen Walzmoment ist. Bei hohem Walzmoment ist der Drehzahleinbruch groß und die erforderliche Vorsteuerung der Drehgeschwindigkeit der Arbeitswalze ebenso. Die Schwierigkeit der Zugaufbauhilfe ist es, die Höhe der Drehgeschwindigkeitsvorsteuerung Δv und die optimale zeitliche Abfolge genau vorherzusagen.It is known that the drop in speed on the work rolls of a roll stand and thus the pent-up length of the rolling stock in front of the roll stand depends on the speed controller settings (constant in normal operation) and on the rolling conditions and the required rolling torque. When the rolling torque is high, the drop in speed is large, as is the required precontrol of the speed of rotation of the work roll. The difficulty of the train building aid is to precisely predict the amount of the rotational speed pilot control Δv and the optimal time sequence.
Ein Walzgerüst kann beim Anstich eines Walzguts unter Berücksichtigung der erwarteten Walzkraft auf die erforderliche Anstichposition so vorangestellt werden, dass nach dem Füllen des Walzspalts mit dem Material des einlaufenden Walzguts und dem Walzkraftaufbau direkt die gewünschte Auslaufdicke des Walzguts erzeugt wird. Dieses Öffnen des Walzgerüsts von Voranstellposition auf Walzposition führt ebenfalls zu einem Beitrag in der Massenbilanz im Walzspalt beim Anstich des Walzguts und beschleunigt das einlaufende Material des Walzguts weiter. Diese Beschleunigung des einlaufenden Walzgutmaterials ist dem Abbremsen des Arbeitswalzenantriebs überlagert. In vielen Fällen ist der Beschleunigungseffekt untergeordnet. Es gibt aber auch Fälle, bei denen das Einziehen des Walzgutmaterials in den Walzspalt bzw. der Beschleunigungseffekt dominiert und beobachtet werden kann, beispielsweise beim ersten Walzgerüst von CSP(Compact Strip Production)-Anlagen.When tapping a rolling stock, taking the expected rolling force into account, a rolling stand can be placed in front of the required tapping position in such a way that the desired outlet thickness of the rolling stock is generated directly after the roll gap is filled with the material of the incoming rolling stock and the rolling force build-up. This opening of the rolling stand from the advance position to the rolling position also leads to a contribution to the mass balance in the roll gap when the rolling stock is tapped and further accelerates the incoming material of the rolling stock. This acceleration of the incoming rolling stock material is superimposed on the braking of the work roll drive. In many cases, the acceleration effect is subordinate. However, there are also cases in which the pulling of the rolled material into the roll gap or the acceleration effect can be dominated and observed, for example in the first roll stand of CSP (Compact Strip Production) systems.
Eine Anwendung mit besonderer Relevanz der Einziehbedingungen sind neue Anlagenkonzepte von Endlosanlagen (gekoppeltes Gießen und Walzen), bei denen große Brammendicken von beispielsweise 70 mm bis 160 mm Dicke gegossen und ausgewalzt werden sollen. Bei bislang ausgeführten Anlagen wird bei Walzbeginn der Brammenkopf durch das offene erste Walzgerüst eines Walzwerks gefahren, um den wegen ungünstigen Temperaturbedingungen und eingegossenen Kaltstrangkomponenten vom Anguss nicht auswalzbaren Brammenkopf durchzulassen. Die ersten drei Walzgerüste des Walzwerks setzen dann nach dem Bandkopfdurchlauf auf der Bramme auf und schließen innerhalb mehrerer Sekunden auf die erforderliche Zwischendicke. Aufgrund der großen Dicken am Brammenkopf kann das Material des Brammenkopfs nicht auf die gewünschte Zieldicke ausgewalzt werden bzw. der dabei erzeugte Keil muss im nachfolgenden Prozess abgetrennt und ausgeschleust werden, was die Ausbringung einer Endlosanlage reduziert.One application with particular relevance to the drawing-in conditions are new plant concepts for continuous plants (coupled casting and rolling) in which large slab thicknesses of, for example, 70 mm to 160 mm thickness are to be cast and rolled out. In systems that have been implemented to date, the slab head is moved through the open first roll stand of a rolling mill at the start of rolling in order to prevent the sprue from being able to be rolled out due to unfavorable temperature conditions and cast-in cold strand components Let the slab head through. The first three roll stands of the rolling mill then touch the slab after passing through the strip head and close to the required intermediate thickness within a few seconds. Due to the large thicknesses at the slab head, the material of the slab head cannot be rolled out to the desired target thickness or the wedge generated in the process must be separated and discharged, which reduces the output of an endless system.
Bei neuen Strategien soll der Brammenkopf einer Endlosbramme direkt im ersten Walzgerüst eines mehrgerüstigen Walzwerks gewalzt werden. Der nicht walzbare Abschnitt des Brammenkopfes wird hinter der Gießmaschine vor dem ersten Walzgerüst beispielsweise mittels einer Schere abgeschnitten. Beim Anstich des Walzguts ist dann das erste Walzgerüst über die Endlosbramme mit der Gießmaschine verbunden. Ein Anstich eines Walzguts in einem Walzgerüst ist dabei so definiert, dass die Walzspalthöhe vor dem Walzguteintritt in den Walzspalt geringer ist als die Einlaufdicke der einlaufenden Endlosbramme. Durch den Anstich am Brammenkopf der Endlosbramme wird erreicht, dass bereits am Brammenanfang die erforderliche Dickenabnahme eingestellt wird und das Abschneiden von Material oder Erzeugen von Bandbereichen mit Übergangsdicken vermieden wird, was die Ausbringung der Endlosanlage erhöht.In the case of new strategies, the slab head of an endless slab is to be rolled directly in the first rolling stand of a multi-stand rolling mill. The non-rollable section of the slab head is cut off behind the casting machine in front of the first rolling stand, for example using scissors. When the rolling stock is tapped, the first rolling stand is connected to the casting machine via the endless slab. A tapping of a rolling stock in a rolling stand is defined so that the roll gap height before the rolling stock enters the roll gap is less than the inlet thickness of the incoming endless slab. The tapping at the slab head of the continuous slab ensures that the required thickness reduction is set at the beginning of the slab and the cutting of material or the production of strip areas with transition thicknesses is avoided, which increases the output of the endless system.
Geschwindigkeitsstörungen und Massenflussstörungen bei Walzbeginn im ersten Walzgerüst eines mehrgerüstigen Walzwerks können allerdings bis in den Flüssigbereich der über eine Endlosbramme mit dem ersten Walzgerüst verbundenen Gießmaschine zurückwirken. Hierbei gelten besondere Anforderungen, da negative Auswirkungen auf den Gießprozess vermieden werden müssen, die letztlich zu einem Gießabbruch oder zu Qualitätseinbußen am Gießprodukt führen können. Eine geringe Störung der Brammengeschwindigkeit zwischen Gießmaschine und dem ersten Walzgerüst ist daher unumgänglich.Speed disturbances and mass flow disturbances at the start of rolling in the first roll stand of a multi-stand rolling mill can, however, affect the liquid area of the casting machine connected to the first roll stand by an endless slab. Special requirements apply here, since negative effects on the casting process must be avoided, which can ultimately lead to a casting break or loss of quality in the casting product. A slight disturbance in the slab speed between the casting machine and the first roll stand is therefore essential.
Eine Aufgabe der Erfindung ist es, Zugänderungen und/oder Massenflussänderungen in einem in ein Walzgerüst einlaufenden Walzgut während eines Anstichs eines Walzgutkopfes des Walzguts mit dem Walzgerüst weitestgehend zu reduzieren.An object of the invention is to largely reduce tensile changes and / or changes in mass flow in a rolling stock entering a rolling stand while a rolling head of the rolling stock is tapped with the rolling stand.
Diese Aufgabe wird durch die unabhängigen Patentansprüche gelöst. Vorteilhafte Ausgestaltungen sind insbesondere in den abhängigen Patentansprüchen angegeben, die jeweils für sich genommen oder in verschiedener Kombination miteinander einen vorteilhaften oder weiterbildenden Aspekt der Erfindung darstellen können.This problem is solved by the independent claims. Advantageous refinements are specified in particular in the dependent patent claims, which, taken on their own or in various combinations with one another, can represent an advantageous or further-developing aspect of the invention.
Bei einem erfindungsgemäßen Verfahren zum Walzen eines Walzguts in einem Walzwerk mit wenigstens einem Walzgerüst wird eine Spalthöhe eines zwischen Arbeitswalzen des Walzgerüsts angeordneten Walzspalts vor einem Kontakt des Walzguts mit diesen Arbeitswalzen kleiner als eine Einlaufdicke des Walzguts eingestellt, wobei wenigstens eine angetriebene Arbeitswalze des Walzgerüsts mit einer Solldrehgeschwindigkeit betrieben wird, nachdem das Walzgut den Walzspalt erreicht hat, und wobei die angetriebene Arbeitswalze mit einer von der Solldrehgeschwindigkeit abweichenden Vorsteuerungsdrehgeschwindigkeit betrieben wird, bis das Walzgut den Walzspalt erreicht. Erfindungsgemäß wird die Vorsteuerungsdrehgeschwindigkeit ab dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze derart variiert, dass die Vorsteuerungsdrehgeschwindigkeit monoton ansteigt oder monoton abfällt.In a method according to the invention for rolling a rolling stock in a rolling mill with at least one roll stand, a gap height of a roll gap arranged between work rolls of the rolling stand before contact of the rolling stock with these work rolls is set to be less than an inlet thickness of the rolling stock, at least one driven work roll of the rolling stand being set with one Desired rotational speed is operated after the rolling stock has reached the roll gap, and wherein the driven work roll is operated at a pre-control rotational speed deviating from the desired rotating speed until the rolling stock reaches the rolling gap. According to the invention, the pilot rotation speed is varied from the contact of the rolling stock with the driven work roll in such a way that the pilot rotation speed increases monotonously or falls monotonously.
Gemäß der Erfindung wird die von der Solldrehgeschwindigkeit abweichende Vorsteuerungsdrehgeschwindigkeit der angetriebenen Arbeitswalze ab einem ersten Kontakt des in das Walzgerüst einlaufenden Walzguts mit der Arbeitswalze bis zu dem Zeitpunkt, an dem das Walzgut den Walzspalt erreicht hat, variiert. Hierbei ist unter dem Walzspalt der kürzeste Abstand zwischen der angetriebenen Arbeitswalze und einer damit zusammenwirkenden Arbeitswalze zu verstehen. Während dieses Zeitraums wird ein Walzgutkopf des Walzguts bereits durch die Arbeitswalzen umgeformt, bis der Walzspalt mit dem Walzgutmaterial gefüllt ist, was vorliegend mit dem Erreichen des Walzspalts gemeint ist. Ist die Vorsteuerungsdrehgeschwindigkeit höher als die Solldrehgeschwindigkeit, wird die Vorsteuerungsdrehgeschwindigkeit ab dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze derart variiert, dass die Vorsteuerungsdrehgeschwindigkeit monoton abfällt. Ist die Vorsteuerungsdrehgeschwindigkeit geringer als die Solldrehgeschwindigkeit, wird die Vorsteuerungsdrehgeschwindigkeit ab dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze derart variiert, dass die Vorsteuerungsdrehgeschwindigkeit monoton ansteigt. Hierdurch werden weitestgehend reduzierte Zugänderungen und/oder Massenflussänderungen im Bereich vor dem Walzgerüst erzeugt, und zwar auch bei nahezu keinem vorhandenen Zug.According to the invention, the precontrol rotation speed of the driven work roll deviating from the desired rotation speed is varied from a first contact of the rolling stock entering the roll stand with the work roll until the point in time at which the rolling stock has reached the roll gap. Here, the roll gap is to be understood as the shortest distance between the driven work roll and a work roll interacting therewith. During this period, a rolling stock head of the rolling stock is already replaced by the Work rolls are reshaped until the roll gap is filled with the rolling stock, which in the present case means reaching the roll gap. If the pilot rotation speed is higher than the target rotation speed, the pilot rotation speed is varied from the contact of the rolling stock with the driven work roll in such a way that the pilot rotation speed drops monotonously. If the pilot rotation speed is lower than the target rotation speed, the pilot rotation speed is varied from the contact of the rolling stock with the driven work roll such that the pilot rotation speed increases monotonously. As a result, largely reduced train changes and / or changes in mass flow are generated in the area in front of the roll stand, even with almost no train present.
Mit der Erfindung wird der Einfluss einer Massenflussstörung auf das in den Walzspalt einlaufende Walzgut beim Anstich desselben möglichst geringgehalten, da vor dem Walzbeginn die Drehgeschwindigkeit der angetriebenen Arbeitswalze durch die Drehgeschwindigkeitsvorsteuerung bezüglich der zu erwartenden instationären Verhältnisse anders eingestellt wird als unter den Bedingungen ab Erreichung der Zieldicke bzw. Auslaufdicke des Walzguts. Insbesondere kann sich eine angetriebene Arbeitswalze des ersten Walzgerüsts eines Walzwerks vor oder bei Walzbeginn langsamer oder schneller als die Solldrehgeschwindigkeit drehen. Bei einem Endloswalzen (CEM, USP) können sich die angetriebenen Arbeitswalzen der ersten drei Walzgerüste vor oder bei Walzbeginn langsamer oder schneller als die dem jeweiligen Walzgerüst zugeordnete Solldrehgeschwindigkeit drehen. Bei einer CSP-Anlage und bei einem Warmwalzwerk können sich die angetriebenen Arbeitswalzen der ersten zwei Walzgerüste vor oder bei Walzbeginn langsamer oder schneller als die dem jeweiligen Walzgerüst zugeordnete Solldrehgeschwindigkeit drehen.With the invention, the influence of a mass flow disruption on the rolling stock entering the roll gap when tapping the same is kept as low as possible, since before the start of the roll the rotational speed of the driven work roll is set differently by the rotational speed precontrol with respect to the unsteady conditions to be expected than under the conditions from reaching the target thickness or outlet thickness of the rolling stock. In particular, a driven work roll of the first roll stand of a rolling mill can rotate before or at the start of rolling more slowly or faster than the target rotational speed. In the case of endless rolling (CEM, USP), the driven work rolls of the first three roll stands can rotate before or at the start of rolling more slowly or faster than the target rotational speed assigned to the respective roll stand. In a CSP system and in a hot rolling mill, the driven work rolls of the first two roll stands can rotate before or at the start of rolling more slowly or faster than the target rotational speed assigned to the respective roll stand.
Die erfindungsgemäße Variation der Vorsteuerungsdrehgeschwindigkeit ab dem ersten Kontakt des einlaufenden Walzguts mit der angetriebenen Arbeitswalze kann über einen definierten Zeitraum erfolgen, beispielsweise unter Verwendung einer Rampenfunktion oder einer anderen monoton ansteigenden oder monoton abfallenden Funktion. Die Variation der Vorsteuerungsdrehgeschwindigkeit beginnt also mit dem ersten Kontakt des einlaufenden Walzguts mit der angetriebenen Arbeitswalze. Hierbei ist die Variation der Vorsteuerungsdrehgeschwindigkeit vorzugsweise an die Verhältnisse im Walzspalt angepasst. Eine gute Kompensation kann erreicht werden, wenn der Zeitraum der Variation der Vorsteuerungsdrehgeschwindigkeit an den Zeitraum angepasst wird, der mit dem ersten Kontakt zwischen einlaufendem Walzgut und angetriebener Arbeitswalze beginnt und der endet, wenn das Walzgut den Walzspalt erreicht hat. Diese Walzspaltfülldauer tF kann mit der gedrückten Länge I des bereits umgeformten Walzgutkopfabschnitts näherungsweise berechnet werden aus der Gleichung tF=I/v0 oder tF=I/v1, wobei v0 die Solldrehgeschwindigkeit der angetriebenen Arbeitswalze und v1 die Einlaufgeschwindigkeit des in das Walzgerüst einlaufenden Walzguts ist.The variation of the precontrol rotation speed according to the invention from the first contact of the incoming rolling stock with the driven work roll can take place over a defined period of time, for example using a ramp function or another monotonically increasing or monotonously decreasing function. The variation of the pre-control rotation speed therefore begins with the first contact of the incoming rolling stock with the driven work roll. In this case, the variation of the pre-control rotational speed is preferably adapted to the conditions in the roll gap. A good compensation can be achieved if the period of the variation of the pilot rotation speed is adapted to the period that begins with the first contact between the incoming rolling stock and the driven work roll and ends when the rolling stock has reached the roll gap. This roll gap filling time t F can be approximately calculated from the equation t F = I / v 0 or t F = I / v 1 with the pressed length I of the already formed rolling stock head section, where v 0 is the target rotational speed of the driven work roll and v 1 is the running-in speed of the rolling stock entering the roll stand.
Vorteilhafterweise ist die Variation der Vorsteuerungsdrehgeschwindigkeit derart gewählt, dass eine zu erwartende Längenstörung Δl vor dem Walzgerüst kompensiert wird. Diese Längenstörung setzt sich zusammen aus einem konstanten Anteil aus dem Einziehverhalten des Walzguts in den Walzspalt und einem lastabhängigen, das heißt drehmomentabhängigen Anteil für den Drehgeschwindigkeitseinbruch an der angetriebenen Arbeitswalze und ein Öffnen des vorangestellten Walzspalts. Die Kompensationslänge ergibt sich aus der integralen Bilanzierung der Fläche zwischen dem Zeitpunkt, an dem das Walzgut in einen ersten Kontakt mit der angetriebenen Arbeitswalze kommt, und dem Zeitpunkt, an dem das Walzgut den Walzspalt erreicht bzw. diesen ausfüllt, und der Vorsteuerungsdrehgeschwindigkeitsvorgabe relativ zum Wert der Solldrehgeschwindigkeit. Hierbei kann die Drehgeschwindigkeitsvorsteuerung Δv für die Dauer tv der Variation der Vorsteuerungsdrehgeschwindigkeit passend berechnet werden. Wird bei der Variation der Vorsteuerungsdrehgeschwindigkeit eine einfache Rampenfunktion berücksichtigt, ergibt sich Δv = 2•Δl/tv. Es kann sowohl eine negative Geschwindigkeitsvorsteuerung, bei der die Vorsteuerungsdrehgeschwindigkeit geringer als die Solldrehgeschwindigkeit ist, verwendet werden, wenn das Aufstauen von Walzgutmaterial vor dem Walzspalt bzw. dem Walzgerüst aufgrund eines geringen Drehgeschwindigkeitseinbruchs bei kleinem Walzmoment gering ist. Andererseits kann eine positive Geschwindigkeitsvorsteuerung, bei der die Vorsteuerungsdrehgeschwindigkeit höher als die Solldrehgeschwindigkeit ist, verwendet werden, wenn der Drehgeschwindigkeitseinbruch bei großem Lastmoment dominierend ist.The variation of the precontrol rotation speed is advantageously selected such that an expected length disturbance Δl in front of the roll stand is compensated for. This length disturbance is made up of a constant part from the pulling behavior of the rolling stock into the roll gap and a load-dependent, i.e. torque-dependent part for the drop in rotational speed on the driven work roll and an opening of the preceding roll gap. The compensation length results from the integral balancing of the area between the point in time at which the rolling stock comes into first contact with the driven work roll and the point in time at which the rolling stock reaches or fills the roll gap and the pre-control rotational speed specification relative to the value the target rotation speed. Here, the rotational speed pilot control Δv can be calculated appropriately for the duration t v of the variation of the pilot control rotational speed. If a simple ramp function is taken into account when varying the precontrol rotation speed, the result is Δv = 2 • Δl / t v . It can be both a negative speed precontrol, in which the precontrol rotation speed is lower than the target rotation speed, can be used if the build-up of rolling stock in front of the roll gap or the roll stand is low due to a low rotation speed drop with a small rolling torque. On the other hand, positive speed feedforward control, in which the feedforward rotational speed is higher than the target rotational speed, can be used if the rotational speed drop is dominant at high load torque.
Mit der Erfindung können somit ein konstanter Massenfluss und ein konstanter Bandtransport während eines Anstichs des Walzguts in dem Walzgerüst gewährleistet werden, was mit einer Minimierung der Rückwirkung auf eine Gießmaschine verbunden ist, die zur Ausbildung einer Endlosanlage dem (ersten) Walzgerüst des Walzwerks vorgeschaltet ist.With the invention, a constant mass flow and a constant strip transport during tapping of the rolling stock in the rolling stand can thus be ensured, which is associated with minimizing the reaction to a casting machine which is connected upstream of the (first) rolling stand of the rolling mill to form an endless system.
Die vorbekannten Lösungen sind für die üblichen Anwendungsfelder, insbesondere bei den hinteren Walzgerüsten von mehrgerüstigen Warmwalzwerken gültig und teilweise erprobt. Sie berücksichtigen aber nicht die detaillierten Verhältnisse beim Walzbeginn in einem voreingestellten Walzspalt (Walzspalthöhe < Einlaufdicke des Walzguts) der ersten Walzgerüste von Warmwalzwerken, insbesondere in einem ersten Walzgerüst einer Endlosanlage. Diese detaillierten Verhältnisse sind bei solchen Walzwerken bzw. Anlagen jedoch ausschlaggebend für das Geschwindigkeitsverhalten des einlaufenden Materials beim Walzbeginn. Wird die Drehgeschwindigkeit einer angetriebenen Arbeitswalze erfindungsgemäß an die detaillierten Verhältnisse angepasst, kann dies sogar dazu führen, dass sich beispielsweise eine angetriebene Arbeitswalze eines ersten Walzgerüsts eines mehrgerüstigen Walzwerks einer Endlosanlage vor dem Anstich des Walzguts mit diesem Walzgerüst langsamer drehen muss als die Solldrehgeschwindigkeit, um eine möglichst geringe Massenflussstörung zu erhalten. Damit sind bekannten Lösungen, bei denen die Vorsteuerungsdrehgeschwindigkeit höher als die Sollgeschwindigkeit ist, für diesen Anwendungsfall nicht ausreichend und damit ungeeignet.The previously known solutions are valid for the usual fields of application, in particular in the rear rolling stands of multi-stand hot rolling mills, and have been partially tested. However, they do not take into account the detailed conditions at the start of rolling in a preset roll gap (roll gap height <inlet thickness of the rolling stock) of the first roll stands of hot rolling mills, especially in a first roll stand of an endless system. In such rolling mills or plants, however, these detailed conditions are decisive for the speed behavior of the incoming material at the start of rolling. If the rotational speed of a driven work roll according to the invention is adapted to the detailed conditions, this can even lead to the fact that, for example, a driven work roll of a first roll stand of a multi-stand rolling mill of an endless system has to rotate more slowly than the target rotation speed by one before the rolling stock is tapped with this roll stand to get the lowest possible mass flow disturbance. These are known solutions in which the Pilot rotation speed is higher than the target speed, is not sufficient for this application and therefore unsuitable.
Die Erfindung ist unter einem sehr geringen Aufwand realisierbar und bedarf keines zusätzlichen Platzbedarfs für alternative Einbauten zur Aufrechterhaltung eines konstanten Massenflusses, wie beispielsweise einen Schlingenspeicher zum Ausgleich von Massenflussstörungen, der für eine Walzgutdicke von bis zu 120 mm ausgelegt werden müsste. Zudem wird bei dem erfindungsgemäßen Verfahren kein erhöhter Materialausschuss erzeugt, da das Walzgut inklusive seines Walzgutkopfes vollständig gewalzt wird. Ferner ermöglicht die Erfindung eine Reduzierung der Anforderungen an die Geschwindigkeit einer Massenflussregelung zwischen einer Gießmaschine und erstem Walzgerüst eines mehrgerüstigen Walzwerks einer Endlosanlage, wobei die Massenflussregelung nahezu stationäre Verhältnisse ausregeln kann und für den relativ schnellen Anstich in dem ersten Walzgerüst erheblich entlastet wird.The invention can be implemented with very little effort and does not require any additional space for alternative internals to maintain a constant mass flow, such as a loop storage device to compensate for mass flow disturbances, which would have to be designed for a rolling stock thickness of up to 120 mm. In addition, no increased material waste is generated in the method according to the invention, since the rolling stock including its rolling stock head is completely rolled. Furthermore, the invention enables a reduction in the demands on the speed of a mass flow control between a casting machine and the first roll stand of a multi-stand rolling mill of an endless system, the mass flow control being able to compensate for almost stationary conditions and being relieved for the relatively fast tapping in the first roll stand.
Mit dem erfindungsgemäßen Verfahren kann ein Walzgut in Form einer Bramme, insbesondere einer Endlosbramme, gewalzt werden. Das Walzwerk kann hierzu auch zwei oder mehrere Walzgerüste aufweisen. Da erfindungsgemäß die Spalthöhe des zwischen Arbeitswalzen des Walzgerüsts angeordneten Walzspalts vor einem Kontakt des Walzguts mit diesen Arbeitswalzen kleiner als eine Einlaufdicke des Walzguts eingestellt wird, wird das Walzgut von seinem Walzgutkopf an und damit vollständig gewalzt, was einen Materialausschuss gegenüber Anlagen reduziert, bei denen der Walzgutkopf zunächst durch geöffnete Walzgerüste geführt und anschließend von dem übrigen Walzgut abgetrennt wird. Es können auch beide in Kontakt mit dem Walzgut kommende Arbeitswalzen des Walzgerüsts entsprechend angetrieben werden, wobei eine Drehzahl der jeweiligen Arbeitswalze erfindungsgemäß gesteuert und/oder geregelt werden kann. Die Solldrehgeschwindigkeit ist auf einen Betrieb des Walzgerüsts nach erfolgtem Anstich des Walzguts bei konstanten bzw. stationären Walzbedingungen abgestimmt. Der Kontakt des Walzguts mit der angetriebenen Arbeitswalze und/oder das Erreichen des Walzspalts durch das Walzgut kann mit einer geeigneten Sensorik erfasst werden. Beispielsweise kann wenigstens einer dieser Walzzustände über eine Erfassung der an dem Walzgerüst momentan vorliegenden Walzkraft erfasst werden, indem ein vorab bestimmter Walzkraftwert dem jeweiligen Walzzustand zugeordnet wird und der momentan erfasste Walzkraftwert mit dem vorab bestimmten Walzkraftwert verglichen wird.With the method according to the invention, a rolling stock in the form of a slab, in particular an endless slab, can be rolled. For this purpose, the rolling mill can also have two or more roll stands. Since, according to the invention, the gap height of the roll gap arranged between work rolls of the roll stand is set to be smaller than an inlet thickness of the rolling stock before the rolling stock comes into contact with it, the rolling stock is rolled from its rolling stock head and thus completely, which reduces material waste compared to systems in which the Rolled material head first passed through open rolling stands and then separated from the remaining rolled material. Both working rolls of the roll stand coming into contact with the rolling stock can also be driven accordingly, wherein a speed of rotation of the respective working roll can be controlled and / or regulated according to the invention. The target rotational speed is coordinated with operation of the roll stand after tapping the rolling stock under constant or stationary rolling conditions. The contact of the rolling stock with the driven one A suitable sensor system can be used to detect the work roll and / or the rolling gap reaching the roll gap. For example, at least one of these rolling conditions can be detected by detecting the rolling force currently present on the roll stand by assigning a predetermined rolling force value to the respective rolling condition and comparing the rolling force value currently detected with the predetermined rolling force value.
Gemäß einer vorteilhaften Ausgestaltung wird die Vorsteuerungsdrehgeschwindigkeit ab dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze mittels einer Vorsteuerungsfunktion variiert, die zumindest unter Berücksichtigung einer zu erwartenden Walzkraft und/oder eines zu erwartenden Walzmoments und/oder einer Einlaufgeschwindigkeit des Walzguts und/oder der Walzspaltgeometrie ermittelt wird. Hierdurch kann eine optimale Vorsteuerfunktion v= f(t) im zeitlichen und funktionalen Ablauf ermittelt werden, wozu Informationen aus üblichen Stichplanberechnungen, wie die zu erwartende Walzkraft, das zu erwartende Walzmoment und die Einlaufgeschwindigkeit des Walzguts, herangezogen werden können. In diesem Fall müssen diese Informationen für die Berechnung der Vorsteuerfunktion zur Verfügung stehen und in einer geeigneten Berechnungseinheit für den jeweiligen Stichplan berechnet werden.According to an advantageous embodiment, the precontrol rotation speed is varied from the contact of the rolling stock with the driven work roll by means of a precontrol function which is determined at least taking into account an expected rolling force and / or an expected rolling torque and / or an infeed speed of the rolling stock and / or the roll gap geometry , In this way, an optimal pilot control function v = f (t) can be determined in terms of time and function, for which information from usual pass schedule calculations, such as the expected rolling force, the expected rolling moment and the running-in speed of the rolling stock, can be used. In this case, this information must be available for the calculation of the input tax function and calculated in a suitable calculation unit for the respective pass schedule.
Gemäß einer weiteren vorteilhaften Ausgestaltung wird die Vorsteuerungsdrehgeschwindigkeit derart vorgegeben, dass von dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze bis zum Erreichen der stationären Solldrehgeschwindigkeit das zeitliche Integral zwischen der Vorsteuerungsdrehgeschwindigkeit und der stationären Solldrehgeschwindigkeit eine Fläche ergibt, die eine vorgebbare Kompensationslänge beschreibt, die der erwarteten Massenflussstörung am Walzspalteintritt beim Walzbeginn entspricht. Die Kompensationslänge wird vorzugsweise aus der Fläche berechnet. Die Kompensationslänge kann unter Berücksichtigung der Drehgeschwindigkeit der Arbeitswalze und weiteren massenflussbeeinflussenden Anteilen beim Walzbeginn berechnet werden. Die Kompensationslänge kann insbesondere unter Berücksichtigung der Drehgeschwindigkeit der Arbeitswalze beim Walzbeginn, dem Einziehverhalten ab dem Kontakt des Walzguts mit der Arbeitswalze und der vertikalen Bewegung der zusammenwirkenden Arbeitswalzen beim Anstich berechnet werden.According to a further advantageous embodiment, the pre-control rotation speed is specified such that from the contact of the rolling stock with the driven work roll until the stationary target rotation speed is reached, the time integral between the pre-control rotation speed and the stationary target rotation speed results in an area that describes a predefinable compensation length that the expected one Mass flow disturbance at the nip entry at the beginning of the rolling corresponds. The compensation length is preferably calculated from the area. The compensation length can be calculated taking into account the speed of rotation of the work roll and other parts influencing the mass flow at the start of rolling. The compensation length can in particular be below Taking into account the speed of rotation of the work roll at the start of rolling, the drawing-in behavior from the contact of the rolling stock with the work roll and the vertical movement of the interacting work rolls at the tapping.
Gemäß einer weiteren vorteilhaften Ausgestaltung wird die Vorsteuerungsdrehgeschwindigkeit derart vorgegeben, dass der monotone Verlauf der Vorsteuerungsdrehgeschwindigkeit sich zeitlich innerhalb einer Walzspaltfüllzeit, die mit dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze beginnt und mit dem Erreichen der stationären Solldrehgeschwindigkeit endet, erstreckt. Vorzugsweise wird die Länge der Walzspaltfüllzeit größer als 50 ms gewählt.According to a further advantageous embodiment, the precontrol rotation speed is predetermined such that the monotonous course of the precontrol rotation speed extends in time within a roll gap filling time, which begins when the rolling stock comes into contact with the driven work roll and ends when the stationary target rotation speed is reached. The length of the roll gap filling time is preferably chosen to be greater than 50 ms.
Gemäß einer weiteren vorteilhaften Ausgestaltung wird eine Walzgutgeschwindigkeit des Walzguts an einem Gerüsteinlauf des Walzgerüsts gemessen und bei der Variation der Vorsteuerungsdrehgeschwindigkeit ab dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze berücksichtigt. Eine trotz der Drehgeschwindigkeitsvorsteuerung verbleibende Störung, die beispielsweise durch wechselnde und unbekannte Reibverhältnisse im Walzspalt verursacht sein kann, kann durch die Messung der tatsächlichen Walzgutgeschwindigkeit am Gerüsteinlauf und eine Anpassung der Variation der Vorsteuerungsdrehgeschwindigkeit der angetriebenen Arbeitswalze unter Berücksichtigung der gemessenen Walzgutgeschwindigkeit weiter reduziert werden.According to a further advantageous embodiment, a rolling stock speed of the rolling stock is measured at a stand inlet of the rolling stand and is taken into account in the variation of the pre-control rotation speed from the contact of the rolling stock with the driven work roll. A fault that remains despite the rotational speed precontrol, which can be caused, for example, by changing and unknown friction conditions in the roll gap, can be further reduced by measuring the actual rolling stock speed at the stand inlet and adjusting the variation of the precontroling rotational speed of the driven work roll, taking into account the measured rolling stock speed.
Gemäß einer weiteren vorteilhaften Ausgestaltung wird bei der Variation der Vorsteuerungsdrehgeschwindigkeit ab dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze eine Stromaufnahme von Gießmaschinenantrieben einer dem Walzwerk vorgeschalteten Gießmaschine berücksichtigt. Eine trotz der Drehgeschwindigkeitsvorsteuerung verbleibende Störung, die beispielsweise durch wechselnde und unbekannte Reibverhältnisse im Walzspalt verursacht sein kann, kann durch die Messung der Stromaufnahme der Gießmaschinenantriebe und Anpassung der Variation der Vorsteuerungsdrehgeschwindigkeit der angetriebenen Arbeitswalze unter Berücksichtigung der gemessenen Stromaufnahme weiter reduziert werden.According to a further advantageous embodiment, a current consumption of casting machine drives of a casting machine upstream of the rolling mill is taken into account in the variation of the precontrol rotation speed from the contact of the rolling stock with the driven work roll. A fault that remains despite the rotational speed precontrol, which can be caused, for example, by changing and unknown friction conditions in the roll gap, can be measured by measuring the current consumption of the casting machine drives and adapting the variation of the pilot rotation speed of the driven work roll can be further reduced taking into account the measured current consumption.
Ein erfindungsgemäßes Walzwerk zum Walzen eines Walzguts umfasst wenigstens ein Walzgerüst und wenigstens eine das Walzgerüst ansteuernde Steuer- und/oder Regeleinheit, wobei die Steuer- und/oder Regelelektronik eingerichtet ist, eine Spalthöhe eines zwischen Arbeitswalzen des Walzgerüsts angeordneten Walzspalts vor einem Kontakt des Walzguts mit diesen Arbeitswalzen kleiner als eine Einlaufdicke des Walzguts einzustellen, wenigstens eine angetriebene Arbeitswalze des Walzgerüsts mit einer Solldrehgeschwindigkeit zu betreiben, nachdem das Walzgut den Walzspalt erreicht hat, und die angetriebene Arbeitswalze mit einer von der Solldrehgeschwindigkeit abweichenden Vorsteuerungsdrehgeschwindigkeit zu betreiben, bis das Walzgut den Walzspalt erreicht. Erfindungsgemäß ist die Steuer- und/oder Regelelektronik eingerichtet, die Vorsteuerungsdrehgeschwindigkeit ab dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze derart zu variieren, dass die Vorsteuerungsdrehgeschwindigkeit monoton ansteigt oder monoton abfällt.A rolling mill according to the invention for rolling a rolling stock comprises at least one rolling stand and at least one control and / or regulating unit which controls the rolling stand, the control and / or regulating electronics being set up, a gap height of a roll gap arranged between work rolls of the rolling stand before contact of the rolling stock with to set these work rolls to be smaller than an inlet thickness of the rolling stock, to operate at least one driven work roll of the roll stand at a target rotation speed after the rolling stock has reached the roll gap, and to operate the driven work roll at a pilot control rotation speed which deviates from the target rotation speed until the rolling stock reaches the roll gap , According to the invention, the control and / or regulating electronics are set up to vary the precontrol rotation speed from the contact of the rolling stock with the driven work roll in such a way that the precontrol rotation speed increases monotonously or decreases monotonously.
Mit dem Walzwerk sind die oben mit Bezug auf das Verfahren genannten Vorteile entsprechend verbunden. Insbesondere kann das Walzwerk zur Durchführung des Verfahrens nach einer der oben genannten Ausgestaltungen oder einer beliebigen Kombination von wenigstens zwei dieser Ausgestaltungen miteinander verwendet werden. Das Walzwerk kann auch zwei oder mehrere Walzgerüste aufweisen, die mit der Steuer- und/oder Regeleinheit ansteuerbar sind. Die Steuer- und/oder Regeleinheit kann wenigstens eine Datenverarbeitungseinheit, beispielsweise einen Mikroprozessor, und wenigstens einen Datenspeicher aufweisen.The advantages mentioned above with regard to the method are correspondingly associated with the rolling mill. In particular, the rolling mill can be used to carry out the method according to one of the above-mentioned configurations or any combination of at least two of these configurations with one another. The rolling mill can also have two or more rolling stands which can be controlled by the control and / or regulating unit. The control and / or regulating unit can have at least one data processing unit, for example a microprocessor, and at least one data memory.
Gemäß einer vorteilhaften Ausgestaltung ist die Steuer- und/oder Regelelektronik eingerichtet, die Vorsteuerungsdrehgeschwindigkeit ab dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze mittels einer Vorsteuerungsfunktion zu variieren und vorab die Vorsteuerungsfunktion zumindest unter Berücksichtigung einer zu erwartenden Walzkraft und/oder eines zu erwartenden Walzmoments und/oder einer Einlaufgeschwindigkeit des Walzguts zu ermitteln. Mit dieser Ausgestaltung sind die oben mit Bezug auf die entsprechende Ausgestaltung des Verfahrens genannten Vorteile entsprechend verbunden.According to an advantageous embodiment, the control and / or regulating electronics are set up to control the precontrol rotation speed from the contact of the rolling stock with the driven work roll by means of a precontrol function vary and determine in advance the pilot control function at least taking into account an expected rolling force and / or an expected rolling torque and / or an infeed speed of the rolling stock. The advantages mentioned above with reference to the corresponding configuration of the method are correspondingly associated with this configuration.
Gemäß einer weiteren vorteilhaften Ausgestaltung ist die Steuer- und/oder Regelelektronik eingerichtet, die Vorsteuerungsdrehgeschwindigkeit derart vorzugeben, dass von dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze bis zum Erreichen der stationären Solldrehgeschwindigkeit das zeitliche Integral zwischen der Vorsteuerungsdrehgeschwindigkeit und der stationären Solldrehgeschwindigkeit eine Fläche ergibt, die eine vorgebbare Kompensationslänge beschreibt, die der erwarteten Massenflussstörung am Walzspalteintritt beim Walzbeginn entspricht. Die Steuer- und/oder Regelelektronik ist vorzugsweise eingerichtet, die Kompensationslänge aus der Fläche zu berechnen. Die Steuer- und/oder Regelelektronik kann eingerichtet sein, die Kompensationslänge kann unter Berücksichtigung der Drehgeschwindigkeit der Arbeitswalze und weiteren massenflussbeeinflussenden Anteilen beim Walzbeginn zu berechnen. Die Steuer- und/oder Regelelektronik kann eingerichtet sein, die Kompensationslänge kann insbesondere unter Berücksichtigung der Drehgeschwindigkeit der Arbeitswalze beim Walzbeginn, dem Einziehverhalten ab dem Kontakt des Walzguts mit der Arbeitswalze und der vertikalen Bewegung der zusammenwirkenden Arbeitswalzen beim Anstich zu berechnen.According to a further advantageous embodiment, the control and / or regulating electronics are set up to predefine the pilot rotation speed in such a way that from the contact of the rolling stock with the driven work roll until the stationary target rotational speed is reached, the time integral between the pilot rotation speed and the stationary target rotational speed results in an area, which describes a predefinable compensation length that corresponds to the expected mass flow disturbance at the roll gap entry at the start of rolling. The control and / or regulating electronics are preferably set up to calculate the compensation length from the area. The control and / or regulating electronics can be set up, the compensation length can be calculated taking into account the speed of rotation of the work roll and other components influencing the mass flow at the start of the rolling process. The control and / or regulating electronics can be set up, the compensation length can be calculated in particular taking into account the speed of rotation of the work roll at the start of rolling, the drawing-in behavior from the contact of the rolling stock with the work roll and the vertical movement of the interacting work rolls when tapping.
Gemäß einer weiteren vorteilhaften Ausgestaltung ist die Steuer- und/oder Regelelektronik eingerichtet, die Vorsteuerungsdrehgeschwindigkeit derart vorzugeben, dass der monotone Verlauf der Vorsteuerungsdrehgeschwindigkeit sich zeitlich innerhalb einer Walzspaltfüllzeit, die mit dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze beginnt und mit dem Erreichen der stationären Solldrehgeschwindigkeit endet, erstreckt. Vorzugsweise ist die Länge der Walzspaltfüllzeit größer als 50 ms.According to a further advantageous embodiment, the control and / or regulating electronics is set up to specify the pilot rotation speed in such a way that the monotonous course of the pilot rotation speed occurs within a roll gap filling time which begins with the contact of the rolling stock with the driven work roll and with the stationary station being reached Target rotational speed ends, extends. The length of the roll gap filling time is preferably greater than 50 ms.
Gemäß einer weiteren vorteilhaften Ausgestaltung umfasst das Walzwerk wenigstens eine an einem Gerüsteinlauf des Walzgerüsts angeordnete, mit der Steuer- und/oder Regeleinheit verbundene Messeinheit zum Messen einer Walzgutgeschwindigkeit des Walzguts an dem Gerüsteinlauf, wobei die Steuer-und/oder Regeleinheit eingerichtet ist, die gemessene Walzgutgeschwindigkeit bei der Variation der Vorsteuerungsdrehgeschwindigkeit ab dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze zu berücksichtigen. Mit dieser Ausgestaltung sind die oben mit Bezug auf die entsprechende Ausgestaltung des Verfahrens genannten Vorteile entsprechend verbunden.According to a further advantageous embodiment, the rolling mill comprises at least one measuring unit, which is arranged on a stand inlet of the rolling stand and is connected to the control and / or regulating unit, for measuring a rolling stock speed of the rolling stock at the stand inlet, the control and / or regulating unit being set up to measure the measured Rolling material speed to be taken into account in the variation of the pre-control rotation speed from the contact of the rolling material with the driven work roll. The advantages mentioned above with reference to the corresponding configuration of the method are correspondingly associated with this configuration.
Gemäß einer weiteren vorteilhaften Ausgestaltung ist die Steuer- und/oder Regeleinheit eingerichtet, bei der Variation der Vorsteuerungsdrehgeschwindigkeit ab dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze eine gemessene Stromaufnahme von Gießmaschinenantrieben einer dem Walzwerk vorgeschalteten Gießmaschine zu berücksichtigen. Mit dieser Ausgestaltung sind die oben mit Bezug auf die entsprechende Ausgestaltung des Verfahrens genannten Vorteile entsprechend verbunden.According to a further advantageous embodiment, the control and / or regulating unit is set up to take into account a measured current consumption of casting machine drives of a casting machine upstream of the rolling mill when varying the pre-control rotation speed from the contact of the rolling stock with the driven work roll. The advantages mentioned above with reference to the corresponding configuration of the method are correspondingly associated with this configuration.
Im Folgenden wird die Erfindung unter Bezugnahme auf die anliegenden Figuren anhand einer bevorzugten Ausführungsform exemplarisch erläutert, wobei die nachfolgend erläuterten Merkmale sowohl jeweils für sich genommen als auch in unterschiedlicher Kombination miteinander einen vorteilhaften oder weiterbildenden Aspekt der Erfindung darstellen können. Es zeigen:
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eine beispielhafte Darstellung eines Drehgeschwindigkeitsverlaufs bei einem herkömmlichen Walzwerk ohne Drehgeschwindigkeitsvorsteuerung;Figur 1 -
eine beispielhafte Darstellung eines Drehgeschwindigkeitsverlaufs bei einem herkömmlichen Walzwerk mit Drehgeschwindigkeitsvorsteuerung;Figur 2 -
Figur 3 eine schematische Darstellung von Geschwindigkeitsverhältnissen beim Anstich eines Walzguts mit einem herkömmlichen Walzwerk; und -
Figur 4 eine beispielhafte Darstellung eines Drehgeschwindigkeitsverlaufs bei einem Ausführungsbeispiel für ein erfindungsgemäßes Walzwerk.
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Figure 1 an exemplary representation of a rotational speed curve in a conventional rolling mill without rotational speed precontrol; -
Figure 2 an exemplary representation of a rotational speed curve in a conventional rolling mill with rotational speed precontrol; -
Figure 3 a schematic representation of speed ratios when tapping a rolling stock with a conventional rolling mill; and -
Figure 4 an exemplary representation of a rotational speed curve in one embodiment for a rolling mill according to the invention.
Die Massenflussverhältnisse beim Anstich im Walzgerüst sind komplex und lassen sich nicht allein durch das Drehzahlverhalten des Antriebs der angetriebenen Arbeitswalze 2 beschreiben. Die angetriebene Arbeitswalze 2 wartet mit der Arbeitswalzendrehgeschwindigkeit v0, die für den stationären Walzprozess erforderlich ist. Da die Materialgeschwindigkeit und die Arbeitswalzendrehgeschwindigkeit am Austritt aus dem Walzspalt des Walzgerüsts nahezu übereinstimmen, ist bei einer großen Dickenabnahme von beispielweise 50 % die Drehgeschwindigkeit der angetriebenen Arbeitswalze v0 nahezu doppelt so groß wie die Oberflächengeschwindigkeit v1 des ankommenden Walzguts 3 (v0=v1•hj/h2/fv mit h1=Einlaufdicke des Walzguts, h2=Auslaufdicke des Walzguts, fv=Materialvoreilung am Walzspaltaustritt). Stößt das einlaufende Walzgut 3 zum Zeitpunkt t1 an die angetriebene Arbeitswalze 2 des Walzgerüsts, wird der an die Arbeitswalze 2 anstoßende Kopfabschnitt des Walzguts 3 durch die hohe Oberflächengeschwindigkeit der Arbeitswalze 2 beschleunigt und schneller in den Walzspalt gezogen. Zu dem Zeitpunkt t2 ist der Walzspalt vollständig gefüllt.The mass flow conditions when tapping in the roll stand are complex and cannot be described solely by the speed behavior of the drive of the driven
Dieser Effekt ist abhängig von den Reibverhältnissen im Walzspalt und der Walzspaltgeometrie, aber nicht vom auftretenden Walzmoment.This effect depends on the friction conditions in the roll gap and the roll gap geometry, but not on the rolling moment that occurs.
Die Vorsteuerungsdrehgeschwindigkeit kann derart vorgegeben werden, dass von dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze bis zum Erreichen der stationären Solldrehgeschwindigkeit das zeitliche Integral zwischen der Vorsteuerungsdrehgeschwindigkeit und der stationären Solldrehgeschwindigkeit eine Fläche ergibt, die eine vorgebbare Kompensationslänge beschreibt, die der erwarteten Massenflussstörung am Walzspalteintritt beim Walzbeginn entspricht. Die Kompensationslänge kann aus der Fläche berechnet werden. Die Kompensationslänge kann unter Berücksichtigung der Drehgeschwindigkeit der Arbeitswalze und weiteren massenflussbeeinflussenden Anteilen beim Walzbeginn berechnet werden. Die Kompensationslänge kann insbesondere unter Berücksichtigung der Drehgeschwindigkeit der Arbeitswalze beim Walzbeginn, dem Einziehverhalten ab dem Kontakt des Walzguts mit der Arbeitswalze und der vertikalen Bewegung der zusammenwirkenden Arbeitswalzen beim Anstich berechnet werden.The precontrol rotation speed can be specified such that from the contact of the rolling stock with the driven work roll until the stationary target rotation speed is reached, the time integral between the precontrol rotation speed and the stationary target rotation speed results in an area that describes a predefinable compensation length that corresponds to the expected mass flow disturbance at the roll gap entry Beginning of rolling corresponds. The compensation length can be calculated from the area. The compensation length can be calculated taking into account the speed of rotation of the work roll and other components that influence the mass flow at the start of the rolling process. The compensation length can be calculated, in particular, taking into account the speed of rotation of the work roll at the start of rolling, the drawing-in behavior from the contact of the rolling stock with the work roll and the vertical movement of the cooperating work rolls when tapping.
Die Vorsteuerungsdrehgeschwindigkeit kann derart vorgegeben werden, dass der monotone Verlauf der Vorsteuerungsdrehgeschwindigkeit (vv) sich zeitlich innerhalb einer Walzspaltfüllzeit, die mit dem Kontakt des Walzguts (3) mit der angetriebenen Arbeitswalze (2) beginnt und mit dem Erreichen der stationären Solldrehgeschwindigkeit (v0) endet, erstreckt. Die Länge der Walzspaltfüllzeit kann größer als 50 ms gewählt werden.The precontrol rotation speed can be specified such that the monotonous course of the precontrol rotation speed (v v ) occurs over time within a roll gap filling time which begins when the rolling stock (3) comes into contact with the driven work roll (2) and when the stationary target rotation speed (v 0 ) ends, extends. The length of the roll gap filling time can be selected to be greater than 50 ms.
Es kann eine Walzgutgeschwindigkeit des Walzguts an einem Gerüsteinlauf des Walzgerüsts gemessen und bei der Variation der Vorsteuerungsdrehgeschwindigkeit ab dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze berücksichtigt werden. Alternativ oder additiv kann bei der Variation der Vorsteuerungsdrehgeschwindigkeit ab dem Kontakt des Walzguts mit der angetriebenen Arbeitswalze eine Stromaufnahme von Gießmaschinenantrieben einer dem Walzwerk vorgeschalteten Gießmaschine berücksichtigt werden.A rolling stock speed of the rolling stock can be measured at a stand inlet of the rolling stand and taken into account in the variation of the pre-control rotation speed from the contact of the rolling stock with the driven work roll. As an alternative or in addition, a variation in the precontrol rotation speed from the contact of the rolling stock with the driven work roll can take into account a current consumption of casting machine drives of a casting machine upstream of the rolling mill.
- 11
- Walzwerkrolling mill
- 22
- ArbeitswalzeStripper
- 33
- Walzgutrolling
- fv f v
- MaterialvoreilungMaterialvoreilung
- FF
- Flächearea
- Fv F v
- Flächearea
- h1 h 1
- Einlaufdickeinlet thickness
- h2 h 2
- Auslaufdickeexit thickness
- MRoll M roll
- Drehmomenttorque
- tt
- Zeittime
- tA t A
- Zeitpunkt des AnstichsTime of the tapping
- tE t E
- Zeitpunkttime
- tV t V
- Zeitdauer der Variation der VorsteuerungsdrehgeschwindigkeitDuration of the variation of the pilot rotation speed
- t1 t 1
- Zeitpunkt des KontaktsTime of contact
- t2 t 2
- Zeitpunkt des Erreichens des WalzspaltsTime of reaching the roll gap
- vv
- Drehgeschwindigkeit der ArbeitswalzeSpeed of rotation of the work roll
- v0 v 0
- SolldrehgeschwindigkeitTarget rotation speed
- vIst v Is
- Istdrehgeschwindigkeitactual rotational speed
- vv v v
- VorsteuerungsdrehgeschwindigkeitFeedforward rotational speed
- Δv Δ v
- Geschwindigkeitsdifferenzspeed difference
Claims (13)
- Method of rolling a rolling material (3) in a rolling mill (1) with at least one roll stand, wherein a gap height of a rolling gap, which is arranged between work rolls (2) of the roll stand, is set before contact of the rolling material (3) with these work rolls (2) so as to be less than an entry thickness (h1) of the rolling material (3), wherein at least one driven work roll (2) of the roll stand is operated at a target rotational speed (v0) after the rolling material (3) has reached the rolling gap and wherein the driven work roll (2) is operated at a pre-control rotational speed (vv) differing from the target rotational speed (V0) until the rolling material (3) has reached the rolling gap, and wherein the pre-control rotational speed (vv), from the contact of the rolling material (3) with the driven work roll (2), is varied in such a way that the pre-control rotational speed (vv) rises monotonically or falls monotonically.
- Method according to claim 1, characterised in that the pre-control rotational speed (vv) from the contact of the rolling material (3) with the driven work roll (2) is varied by means of a pre-control function which is determined at least with consideration of an anticipated rolling force and/or an anticipated rolling moment and/or an entry speed (v1) of the rolling material (3) and/or a rolling gap geometry.
- Method according to claim 1 or 2, characterised in that the pre-control rotational speed (vv) is predetermined in such a way that from the contact of the rolling material (3) with the driven work roll (2) up to reaching the stationary target rotational speed (v0) the time integral between the pre-control rotational speed (Fv) and the stationary target rotational speed (v0) gives an area (vv) describing a predeterminable compensation length which corresponds with the anticipated mass flow disruption at rolling gap entry when rolling begins.
- Method according to any one of claims 1 to 3, characterised in that the pre-control rotational speed is predetermined in such a way that the monotonic plot of the pre-control rotational speed (vv) extends in terms of time within a rolling gap filling time which begins with contact of the rolling material (3) with the driven work roll (2) and ends with reaching the stationary target rotational speed (v0).
- Method according to claim 4, characterised in that the length of the rolling gap filling time is selected to be greater than 50 milliseconds.
- Method according to any one of claims 1 to 5, characterised in that a rolling material speed of the rolling material (3) is measured at a stand inlet of the roll stand and in the case of variation of the pre-control rotation speed (vv) is taken into consideration from the contact of the rolling material (3) with the driven work roll (2).
- Method according to any one of claims 1 to 6, characterised in that in the case of variation of the pre-control rotational speed (vv) a power consumption of casting machine drives of a casting machine upstream of the rolling mill (1) is taken into consideration from the contact of the rolling material (3) with the driven work roll (2).
- Rolling mill (1) for rolling a rolling material (3), comprising at least one roll stand and at least one controlling and/or regulating unit providing drive control of the roll stand, wherein the electronic controlling and/or regulating system is arranged to set a gap height of a rolling gap, which is arranged between work rolls (2) of the roll stand, before contact of the rolling material (3) with these work rolls (2) so as to be smaller than an entry thickness (h1) of the rolling material (3), to operate at least one driven work roll (2) of the roll stand at a target rotational speed (v0) after the rolling material (3) has reached the rolling gap and to operate the driven work roll (2) at a pre-control rotational speed (vv), which differs from the target rotational speed (v0), until the rolling material (3) reaches the rolling gap and wherein the electronic controlling and/or regulating system is arranged to vary the pre-control rotational speed (vv) from the contact of the rolling material (3) with the driven work roll (2) in such a way that the pre-control rotational speed (vv) rises monotonically or falls monotonically.
- Rolling mill (1) according to claim 8, characterised in that the electronic controlling and/or regulating system is arranged to vary the pre-control rotational speed (vv), by means of a pre-control function, from the contact of the rolling material (3) with the driven work roll (2) and to determine the pre-control functional in advance at least with consideration of an anticipated rolling force and/or an anticipated rolling moment and/or an entry speed (v1) of the rolling material (3).
- Rolling mill (1) according to claim 8 or 9, characterised in that the electronic controlling and/or regulating system is arranged to predetermine the pre-control rotational speed (vv) in such a way that from the contact of the rolling material (3) with the driven work roll (2) up to reaching the stationary target rotational speed (v0) the time integral between the pre-control rotational speed (vv) and the stationary target rotational speed (v0) gives an area (Fv) describing a predeterminable compensation length which corresponds with the anticipated mass flow disruption at the rolling gap entry when rolling begins.
- Rolling mill (1) according to any one of claims 8 to 10, characterised in that the electronic controlling and/or regulating system is arranged to predetermine the pre-control rotation speed (vv) in such a way that the monotonic plot of the pre-control rotational speed (vv) extends in time within a rolling gap filling time which begins with contact of the rolling material (3) with the driven work roll (2) and ends with reaching the stationary target rotational speed (v0).
- Rolling mill (1) according to any one of claims 8 to 11, characterised by at least one measuring unit, which is arranged at a stand inlet of the roll stand and is connected with the controlling and regulating unit, for measuring a rolling material speed of the rolling material (3) at the stand inlet, wherein the controlling and/or regulating unit is arranged to take into consideration the measured rolling material speed in the case of variation of the pre-control rotational speed (vv) from the contact of the rolling material (3) with the driven work roll (2).
- Rolling mill (1) according to any one of claims 8 to 12, characterised in that the controlling and/or regulating unit is arranged to take into consideration, in the case of variation of the pre-control rotational speed (vv), a measured power consumption of casting machine drives of a casting machine upstream of the rolling mill (1) from contact of the rolling material (3) with the drive work roll (2).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015220042 | 2015-10-15 | ||
DE102016214715.3A DE102016214715A1 (en) | 2015-10-15 | 2016-08-09 | Process for rolling a rolling stock and rolling mill |
PCT/EP2016/074258 WO2017064017A1 (en) | 2015-10-15 | 2016-10-11 | Method for rolling a rolling material and rolling mill |
Publications (3)
Publication Number | Publication Date |
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EP3362199A1 EP3362199A1 (en) | 2018-08-22 |
EP3362199B1 true EP3362199B1 (en) | 2020-02-19 |
EP3362199B2 EP3362199B2 (en) | 2023-01-11 |
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EP16778843.9A Active EP3362199B2 (en) | 2015-10-15 | 2016-10-11 | Method for rolling a rolling material and rolling mill |
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US (1) | US10875065B2 (en) |
EP (1) | EP3362199B2 (en) |
JP (1) | JP6620233B2 (en) |
KR (1) | KR20180056721A (en) |
CN (1) | CN108136462B (en) |
DE (1) | DE102016214715A1 (en) |
WO (1) | WO2017064017A1 (en) |
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DE102020206535A1 (en) * | 2020-05-26 | 2021-12-02 | Kocks Technik Gmbh & Co Kg | Roll stand with several rolls with integrated diameter scanning of the incoming rolling stock and correction of the caliber based on the rolling stock diameter |
CN112337981A (en) * | 2020-10-16 | 2021-02-09 | 中冶京诚工程技术有限公司 | Rod and wire mill rotating speed steady state value fitting method and device |
CN112337979A (en) * | 2020-10-16 | 2021-02-09 | 中冶京诚工程技术有限公司 | Control method and device for rod and wire rolling mill |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1427926A1 (en) | 1965-12-22 | 1968-11-28 | Kloeckner Werke Ag | Process to avoid rolling stock on the top side in continuous profile and medium iron rolling lines |
DE4229323A1 (en) | 1992-09-02 | 1994-03-10 | Thyssen Edelstahlwerke Ag | Automatic adaptation of roll frame rotations during rotational breakdown in one of the frames - with prior rolls compensating from breakdown, to prevent material build-up in front of problem roll frame |
JPH07245976A (en) | 1994-03-04 | 1995-09-19 | Toshiba Corp | Speed compensation device for rolling mill |
JPH0833911A (en) | 1994-07-22 | 1996-02-06 | Fuji Electric Co Ltd | Speed control device for rolling mill |
DE19726587A1 (en) | 1997-06-23 | 1999-01-07 | Siemens Ag | Reduction and compensation of the speed drop caused by entry of material into a roll stand |
DE102007049062B3 (en) | 2007-10-12 | 2009-03-12 | Siemens Ag | Operating method for introducing a rolling stock into a rolling stand of a rolling mill, control device and rolling mill for rolling a strip-shaped rolling stock |
EP2796217A1 (en) | 2013-04-22 | 2014-10-29 | Siemens Aktiengesellschaft | Method for processing rolled products in a rolling mill with at least one rolling stand |
EP2839892A1 (en) | 2013-08-23 | 2015-02-25 | Siemens Aktiengesellschaft | Method for processing rolled goods in a rolling line and rolling line |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54145350A (en) | 1978-04-11 | 1979-11-13 | Kobe Steel Ltd | Rolling |
JPS57154306A (en) * | 1981-03-18 | 1982-09-24 | Toshiba Corp | Speed compensating device of rolling mill |
JPS5964114A (en) * | 1982-10-04 | 1984-04-12 | Meidensha Electric Mfg Co Ltd | Speed deviation setting circuit in rolling speed controlling device |
JPH0635005B2 (en) * | 1986-04-01 | 1994-05-11 | 株式会社神戸製鋼所 | Biting delay control method in strip rolling |
JPH04361813A (en) * | 1991-06-07 | 1992-12-15 | Kobe Steel Ltd | Method for controlling biting speed of rolled stock in rolling line |
JP2000343103A (en) * | 1999-06-04 | 2000-12-12 | Nippon Steel Corp | Method of starting to roll billet in twin drum type continuous casting equipment, rolling controller, and storage medium |
KR20040019733A (en) * | 2002-08-29 | 2004-03-06 | 재단법인 포항산업과학연구원 | Method for compensating the impact drop of hot strip stand |
KR20040040774A (en) * | 2002-11-08 | 2004-05-13 | 주식회사 포스코 | Speed control method for preventing impact drop in hot finishing mill |
JP2005254289A (en) * | 2004-03-12 | 2005-09-22 | Jfe Steel Kk | Method for controlling speed of rolling mill |
EP2684623A1 (en) * | 2012-07-09 | 2014-01-15 | Siemens Aktiengesellschaft | Method for processing milled goods in a mill train |
-
2016
- 2016-08-09 DE DE102016214715.3A patent/DE102016214715A1/en not_active Withdrawn
- 2016-10-11 EP EP16778843.9A patent/EP3362199B2/en active Active
- 2016-10-11 WO PCT/EP2016/074258 patent/WO2017064017A1/en active Application Filing
- 2016-10-11 JP JP2018519454A patent/JP6620233B2/en active Active
- 2016-10-11 KR KR1020187011118A patent/KR20180056721A/en active Search and Examination
- 2016-10-11 US US15/768,108 patent/US10875065B2/en active Active
- 2016-10-11 CN CN201680060012.0A patent/CN108136462B/en active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1427926A1 (en) | 1965-12-22 | 1968-11-28 | Kloeckner Werke Ag | Process to avoid rolling stock on the top side in continuous profile and medium iron rolling lines |
DE4229323A1 (en) | 1992-09-02 | 1994-03-10 | Thyssen Edelstahlwerke Ag | Automatic adaptation of roll frame rotations during rotational breakdown in one of the frames - with prior rolls compensating from breakdown, to prevent material build-up in front of problem roll frame |
JPH07245976A (en) | 1994-03-04 | 1995-09-19 | Toshiba Corp | Speed compensation device for rolling mill |
JPH0833911A (en) | 1994-07-22 | 1996-02-06 | Fuji Electric Co Ltd | Speed control device for rolling mill |
DE19726587A1 (en) | 1997-06-23 | 1999-01-07 | Siemens Ag | Reduction and compensation of the speed drop caused by entry of material into a roll stand |
DE102007049062B3 (en) | 2007-10-12 | 2009-03-12 | Siemens Ag | Operating method for introducing a rolling stock into a rolling stand of a rolling mill, control device and rolling mill for rolling a strip-shaped rolling stock |
EP2796217A1 (en) | 2013-04-22 | 2014-10-29 | Siemens Aktiengesellschaft | Method for processing rolled products in a rolling mill with at least one rolling stand |
EP2839892A1 (en) | 2013-08-23 | 2015-02-25 | Siemens Aktiengesellschaft | Method for processing rolled goods in a rolling line and rolling line |
Also Published As
Publication number | Publication date |
---|---|
EP3362199B2 (en) | 2023-01-11 |
US10875065B2 (en) | 2020-12-29 |
EP3362199A1 (en) | 2018-08-22 |
KR20180056721A (en) | 2018-05-29 |
DE102016214715A1 (en) | 2017-04-20 |
CN108136462B (en) | 2020-01-03 |
US20180297094A1 (en) | 2018-10-18 |
JP6620233B2 (en) | 2019-12-11 |
WO2017064017A1 (en) | 2017-04-20 |
JP2018534145A (en) | 2018-11-22 |
CN108136462A (en) | 2018-06-08 |
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