EP1763410B1 - Method and device for reducing vibrations in a steckel mill - Google Patents
Method and device for reducing vibrations in a steckel mill Download PDFInfo
- Publication number
- EP1763410B1 EP1763410B1 EP05752303A EP05752303A EP1763410B1 EP 1763410 B1 EP1763410 B1 EP 1763410B1 EP 05752303 A EP05752303 A EP 05752303A EP 05752303 A EP05752303 A EP 05752303A EP 1763410 B1 EP1763410 B1 EP 1763410B1
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- Prior art keywords
- roll
- force
- steckel
- rolling stock
- strip tension
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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
- B21B37/007—Control for preventing or reducing vibration, chatter or chatter marks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
Definitions
- the subject invention relates to a method and apparatus for reducing vibrations due to a flat spot of a Steckel drum in a Steckel mill, wherein between Steckel drum of the Steckel furnace and drivers of the roll stand an engagable roller is arranged, which is brought into engagement with the rolling stock.
- Vibrations occur in a Steckel mill known manner in that a Steckel drum is indeed cylindrical, but along the Steckel drum has a slot which serves to receive the Walzgutkopfes (tape head). This slot is connected with corresponding transition radii with the cylindrical shell of the Steckeltrommel so that the peripheral contour of the coiled on the Steckel drum rolled material is not circular, but has a flat position corresponding to a chord.
- a strip tension drop which corresponds to an extension of the rolling stock section located between the picking drum and the roll stand, respectively, respectively occurs at the flat position, or to a strip tension increase which corresponds to a shortening of the rolling stock section located between the picking drum and the rolling stand.
- the strip tension in this area can be very low or even zero.
- An object of the present invention is therefore to simplify the previously known method for reducing vibrations with regard to the control.
- the object is achieved by a method according to claim 1 or by a device according to claim 8.
- the strip tension is usually controlled by the drives of the two work rolls of the rolling stand and the drives of the two Steckeltrommeln.
- the speed of the Steckeltrommeln results, for example, from the rolling speed and the current collar diameter, the torque of the Steckeltrommeln from the specified strip tension and the collar diameter.
- the deflection of the roll at the flat causes a geometric change in the force application.
- the force on the roll remains the same, it changes only the point of application of the force on the rolling stock. Depending on the direction of the deflection, this means that the predetermined force on the roller causes a slight change in the strip tension.
- the control of the drive of the Steckel drum can compensate for the length error of the rolling stock after passing through the flat by speed change (with the aim to keep the torque with respect to the strip tension) and thereby the role in the starting position, which held the role before the flat, withdraw. This is done automatically by the existing regulation of the Steckeltrommel.
- a possible embodiment of the invention provides that the force is kept constant during one or more revolutions of the Steckeltrommel.
- the strip tension decreases. Due to the constant contact force on the roller, the roller moves until it is in balance with the rolling stock in a new position. By slightly changing the position, the angle between the two rolling stock sections located before and after the roll decreases. With a constant force, the adjusting device causes the Anstellmoment is reduced at Bandzugsabfall, with An increase in tension the Anstellmoment is increased. However, it can be achieved that the strip tension does not become zero.
- the strip tension is usually selected as a function of the rolling stock thickness (strip thickness), the temperature, the thickness, the width and the material properties of the rolling stock, which will not be discussed in more detail here, since this is part of the general knowledge.
- Another possible solution provides that a constant force for a period of one or more revolutions of the Steckel drum force during a certain period of each revolution, an additional force is switched. This can be achieved by increasing the constant force for a certain period of time in advance of the appearance of the strip draft drop, and after this time period back to the original constant Value is lowered. In any case, the drop in the strip tension can be compensated for more quickly than in the case of the constant force during one revolution. The anticipatory activation of an additional force can even better compensate for the inertia of the role.
- the time span of switching on the additional force corresponds to about 1/3 of the duration of the unwinding or coiling of the rolling stock on the flat.
- the force is changed depending on the collar diameter of the rolling stock on the Steckeltrommel. That is, the force remains e.g. During a revolution of the Steckel drum is substantially constant and is continuously larger or smaller with increasing collar diameter. In the case of execution of the periodic connection of an additional force also continuously increases the constant force, the additional power not.
- the force on the roll and the force exerted on the roll by the strip tension and the wrapping of the rolling stock are in equilibrium.
- the collar diameter increases or decreases, the spatial position of the rolling stock between roller and Steckeltrommel and thus the balance of power changes so that the force on the role or the spatial position of the role is changed to restore the former balance of power.
- the necessary change in the force can be determined or calculated from the force parallelogram from the forces acting on the roll (strip tension and contact force on the roll).
- the force on the role is given both in dependence on the strip tension and the diameter of the collar, then the force can be chosen so that it balances the momentary Bandzugresultierenden and the role only during the Bandzugsschwankung briefly changes their position and then back into the starting position foundedstehrt before the Bandzugsschwankung.
- the force is usually chosen so that it cancels the force exerted by the predetermined strip tension on the roller force in a predetermined position of the roller.
- the variable position of the roll one determines the necessary force due to the geometrical conditions (arrangement of the rolled material relative to the roll) e.g. at the beginning of the reeling process due to the predetermined strip tension from the parallelogram of forces.
- the force on the roll during the coiling process is continuously adapted to the changing geometrical conditions due to the increase or decrease in the diameter of the band tensioning effect on the roll with the aid of the parallelogram of forces.
- roller and / or its bearings such as a swivel arm
- the roller and / or its bearings is hydraulically operated, has the advantage that the employment can be faster and more accurate compared to the pneumatic employment or employment by means of an engine.
- the roller Due to the fact that the roller is moved substantially normal to the plane of the rolling stock between the driver and the driver, the largest possible effect is achieved with a low deflection of the roller.
- the employment of the role can be effected by obliquely aligned to this plane adjusting cylinder.
- the device for carrying out the method may comprise at least one preferably hydraulic setting cylinder, which acts on the bearing of the roller, such as a swivel arm.
- the adjusting cylinder advantageously has a position measuring device, for determining the starting position and for controlling the position of the roller during the coiling operation.
- the adjusting cylinder can have both a rod side and a piston side via a pressure measuring device, which has the advantage that the actual pressures can be monitored.
- Fig. 1 is between the Steckel drum 1 of the so-called Steckel furnace (Coiler furnace) and arranged before or after the rolling stand 5 drivers 2 arranged an additional engageable role 3.
- the roller is mounted in a pivoting arm and in engagement with the rolling stock 6.
- the drivers 2 are at this time opened with the fixed position of the upper drive roller.
- the threading slot 7 of the Steckel drum 1 requires for the reeled rolling 6 a flat spot.
- Fig. 2 shows in left top in position a) a device according to the invention before the caused by the flat strip tension drop and bottom left in position b) during the Bandzugsabfalls.
- the Steckel drum 1 rotates counterclockwise in accordance with the arrow indicated about the axis of rotation and winds up the rolling stock 6.
- the roller 3 is mounted at both ends on a pivot arm 4, on each of which a hydraulic adjusting cylinder 8 engages.
- the two pivot arms 4 are pivotable about the pivot axis 9 and connected to each other in the area.
- the acting band train is represented by vectors 10.
- the resulting on the roller 3 resulting strip tension results from the force parallelogram shown in the figure, in which the resultant of the strip 10 opposite, but equal force 11, which must apply the adjusting cylinder 8 at this time on the role, are removed can.
- Fig. 2 Right below in Fig. 2 are the two positions a) and b), simplified only in the form of the rolling stock and the role with swivel arm, shown superimposed.
- the arrow 12 shows the direction of movement the role of 3 during winding over the flat position of the Steckeltrommel. 1
- the drive control of the Steckel drum 1 reacts to the Bandzugabfall by increasing the speed and the roller 3 is pulled back to the zero position before the Bandzugabfall. This ensures that the reel 3 always returns to the starting position of the reel before passing through the flat, provided that the force is adapted to the reel 3 of the current reel (as a function of the reel diameter). Otherwise (variable position-of-roll), it holds that the roller continuously increases from a lower position to an upper position in accordance with the constant force of the adjusting cylinder 8.
- the geometry of the articulation of the hydraulic adjusting cylinder 8 has been chosen so that the lever arm of the cylinder force is reduced relative to the center of gravity of the pivot arm 4 and thereby slightly reduced despite deflection of the pivot arm 4 of the strip tension.
- the torque control of the Steckel drum 1 reacts with an increase in the speed until the desired strip tension is restored.
- the roll 3 is thereby returned to its position before the strip tension reduction.
- Fig. 3 shows analogously to Fig. 2 Upper left in position a), a device according to the invention before the caused by the flat Bandzuganieri and lower left in position b) during the Bandzuganteries.
- the geometry of the articulation of the hydraulic adjusting cylinder was chosen so that the lever arm of the cylinder force is increased relative to the center of gravity of the pivot arm 4 and thereby slightly increased despite deflection of the pivot arm 4 of the strip tension.
- the torque control of the Steckel drum 1 reacts with a reduction in the speed until the desired strip tension is restored.
- the roll 3 is thereby returned to its position before the strip tension increase.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
- Manufacture Of Motors, Generators (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Control Of Metal Rolling (AREA)
- Vibration Prevention Devices (AREA)
- Crushing And Grinding (AREA)
Abstract
Description
Die gegenständliche Erfindung betrifft ein Verfahren und eine Vorrichtung zur Reduktion von Schwingungen aufgrund einer Flachstelle einer Steckeltrommel in einem Steckelwalzwerk, wobei zwischen Steckeltrommel des Steckelofens und Treiber des Walzgerüsts eine anstellbare Rolle angeordnet ist, die mit dem Walzgut in Eingriff gebracht wird.The subject invention relates to a method and apparatus for reducing vibrations due to a flat spot of a Steckel drum in a Steckel mill, wherein between Steckel drum of the Steckel furnace and drivers of the roll stand an engagable roller is arranged, which is brought into engagement with the rolling stock.
Schwingungen entstehen in einem Steckelwalzwerk bekannter Weise dadurch, dass eine Steckeltrommel zwar zylindrisch ist, aber längs der Steckeltrommel einen Schlitz aufweist, der zur Aufnahme des Walzgutkopfes (Bandkopfes) dient. Dieser Schlitz ist mit entsprechenden Übergangsradien mit dem zylindrischen Mantel der Steckeltrommel verbunden, sodass die Umfangskontur des auf der Steckeltrommel aufgehaspelten Walzguts nicht kreisförmig ist, sondern eine Flachstelle aufweist, die einer Kreissehne entspricht.Vibrations occur in a Steckel mill known manner in that a Steckel drum is indeed cylindrical, but along the Steckel drum has a slot which serves to receive the Walzgutkopfes (tape head). This slot is connected with corresponding transition radii with the cylindrical shell of the Steckeltrommel so that the peripheral contour of the coiled on the Steckel drum rolled material is not circular, but has a flat position corresponding to a chord.
Beim Auf- bzw. Abhaspeln des Walzguts kommt es daher an der Flachstelle jeweils zu einem Bandzugsabfall, der einer Verlängerung des zwischen Steckeltrommel und Walzgerüst befindlichen Walzgutabschnitts entspricht, bzw. zu einem Bandzugsanstieg, der einer Verkürzung des zwischen Steckeltrommel und Walzgerüst befindlichen Walzgutabschnitts entspricht. Bei einem Bandzugsabfall kann der Bandzug in diesem Bereich sehr gering oder auch Null werden.When rewinding or unwinding the rolling stock, a strip tension drop, which corresponds to an extension of the rolling stock section located between the picking drum and the roll stand, respectively, respectively occurs at the flat position, or to a strip tension increase which corresponds to a shortening of the rolling stock section located between the picking drum and the rolling stand. With a strip draft drop, the strip tension in this area can be very low or even zero.
Eine Lösung dieses Problems schlägt die
Eine Aufgabe der vorliegenden Erfindung besteht nun darin, das vorbekannte Verfahren zur Reduzierung von Schwingungen im Hinblick auf die Regelung zu vereinfachen.An object of the present invention is therefore to simplify the previously known method for reducing vibrations with regard to the control.
Die Aufgabe wird durch ein Verfahren gemäß Anspruch 1 bzw. durch eine Vorrichtung gemäß Anspruch 8 gelöst.The object is achieved by a method according to claim 1 or by a device according to
Dadurch, dass die Kraft, welche die Rolle auf das Walzgut ausübt, auf einen vorgegebenen Wert geregelt wird, also die Rolle mit einer vorgegebenen Kraft gegen das Walzgut gepresst wird, ist sichergestellt, dass bei Erreichen der Flachstelle beim Haspeln der Bandzugsabfall durch das Verschieben der Rolle gegen das Band, was aufgrund der vorgegebenen Kraft auf die Rolle erfolgt, abgeschwächt wird.The fact that the force exerted by the roller on the rolling stock is controlled to a predetermined value, that is, the roller is pressed against the rolling stock with a predetermined force, it is ensured that upon reaching the flat when reeling the strip tension drop by moving the Roll against the tape, which is due to the given force on the role is weakened.
Hierbei wird auf die Antriebssteuerung der Steckeltrommel bzw. auf die Bandzugregelung kein Einfluss ausgeübt, diese arbeitet ohne Koppelung mit der Regelung der Kraft auf die Rolle. Der Bandzug wird in der Regel über die Antriebe der beiden Arbeitswalzen des Walzgerüsts und die Antriebe der beiden Steckeltrommeln geregelt. Die Drehzahl der Steckeltrommeln ergibt sich zum Beispiel aus der Walzgeschwindigkeit und dem aktuellen Bunddurchmesser, das Drehmoment der Steckeltrommeln aus dem vorgegebenen Bandzug und dem Bunddurchmesser.In this case, no influence is exerted on the drive control of the Steckel drum or on the Bandzugregelung, this works without coupling with the regulation of the force on the role. The strip tension is usually controlled by the drives of the two work rolls of the rolling stand and the drives of the two Steckeltrommeln. The speed of the Steckeltrommeln results, for example, from the rolling speed and the current collar diameter, the torque of the Steckeltrommeln from the specified strip tension and the collar diameter.
Die Auslenkung der Rolle bei der Flachstelle bewirkt eine geometrische Änderung des Kraftangriffs. Die Kraft auf die Rolle bleibt gleich, es ändert sich nur der Angriffspunkt der Kraft am Walzgut. Je nach Richtung der Auslenkung bedeutet dies, dass die vorgegebene Kraft auf die Rolle eine geringfügige Änderung des Bandzuges nach sich zieht.The deflection of the roll at the flat causes a geometric change in the force application. The force on the roll remains the same, it changes only the point of application of the force on the rolling stock. Depending on the direction of the deflection, this means that the predetermined force on the roller causes a slight change in the strip tension.
Die Regelung des Antriebes der Steckeltrommel kann nach Durchlauf der Flachstelle durch Drehzahländerung (mit dem Ziel, das Drehmoment im Hinblick auf den Bandzug konstant zu halten) den Längenfehler des Walzguts ausgleichen und dadurch die Rolle in die Ausgangsposition, welche die Rolle vor der Flachstelle innehatte, zurückziehen. Dies geschieht automatisch durch die bestehende Regelung der Steckeltrommel.The control of the drive of the Steckel drum can compensate for the length error of the rolling stock after passing through the flat by speed change (with the aim to keep the torque with respect to the strip tension) and thereby the role in the starting position, which held the role before the flat, withdraw. This is done automatically by the existing regulation of the Steckeltrommel.
Eine mögliche Ausführung der Erfindung sieht vor, dass die Kraft während einer oder mehrerer Umdrehungen der Steckeltrommel konstant gehalten wird.A possible embodiment of the invention provides that the force is kept constant during one or more revolutions of the Steckeltrommel.
Wenn also beim Aufhaspeln des Walzguts bei Durchlauf an der Flachstelle kurzzeitig zuwenig Band aufgewickelt wird, so sinkt der Bandzug. Durch die konstante Anstellkraft auf die Rolle verlagert sich die Rolle so lange, bis sie mit dem Walzgut in neuer Position in Kräftegleichgewicht steht. Durch die geringfügige Veränderung der Position verringert sich der Winkel zwischen den beiden vor und nach der Rolle befindlichen Walzgutabschnitten. Bei konstanter Kraft bewirkt die Anstellvorrichtung, dass bei Bandzugsabfall das Anstellmoment reduziert wird, bei Bandzuganstieg das Anstellmoment erhöht wird. Allerdings kann erreicht werden, dass der Bandzug nicht Null wird. Der Bandzug wird in der Regel als Funktion der Walzgutdicke (Banddicke), der Temperatur, der Dicke, der Breite und der Materialeigenschaften des Walzguts gewählt, worauf hier nicht näher eingegangen wird, da dies zum allgemeinen Fachwissen gehört.If, therefore, too little tape is wound during the winding of the rolling stock at the flat location for a short time, the strip tension decreases. Due to the constant contact force on the roller, the roller moves until it is in balance with the rolling stock in a new position. By slightly changing the position, the angle between the two rolling stock sections located before and after the roll decreases. With a constant force, the adjusting device causes the Anstellmoment is reduced at Bandzugsabfall, with An increase in tension the Anstellmoment is increased. However, it can be achieved that the strip tension does not become zero. The strip tension is usually selected as a function of the rolling stock thickness (strip thickness), the temperature, the thickness, the width and the material properties of the rolling stock, which will not be discussed in more detail here, since this is part of the general knowledge.
Eine andere Lösungsmöglichkeit sieht vor, dass einer für die Dauer einer oder mehrerer Umdrehungen der Steckeltrommel konstanten Kraft während einer bestimmten Zeitspanne jeder Umdrehung eine Zusatzkraft aufgeschaltet wird. Dies kann dadurch erreicht werden, dass vorauseilend zum Auftreten des Bandzugabfalls die konstante Kraft für eine bestimmte Zeitspanne erhöht und nach dieser Zeitspanne wieder auf den ursprünglichen konstanten Wert abgesenkt wird. In jedem Fall kann der Abfall des Bandzuges rascher kompensiert werden als im Fall der während einer Umdrehung konstanten Kraft. Die vorauseilende Aufschaltung einer Zusatzkraft kann dabei die Trägheit der Rolle noch besser kompensieren.Another possible solution provides that a constant force for a period of one or more revolutions of the Steckel drum force during a certain period of each revolution, an additional force is switched. This can be achieved by increasing the constant force for a certain period of time in advance of the appearance of the strip draft drop, and after this time period back to the original constant Value is lowered. In any case, the drop in the strip tension can be compensated for more quickly than in the case of the constant force during one revolution. The anticipatory activation of an additional force can even better compensate for the inertia of the role.
Die Zeitspanne des Aufschaltens der Zusatzkraft entspricht in etwa 1/3 der Dauer des Ab- bzw. Aufhaspeln des Walzguts über die Flachstelle. Zur Bestimmung des Aufschaltens der Zusatzkraft kann die Winkelposition der Steckeltrommel bzw. der Flachstelle ermittelt werden.The time span of switching on the additional force corresponds to about 1/3 of the duration of the unwinding or coiling of the rolling stock on the flat. To determine the connection of the additional force, the angular position of the Steckeltrommel or the flat can be determined.
Weiters kann vorgesehen werden, dass die Kraft in Abhängigkeit vom Bunddurchmesser des Walzguts auf der Steckeltrommel geändert wird. Das heißt, die Kraft bleibt z.B. während einer Umdrehung der Steckeltrommel im Wesentlichen konstant und wird mit zunehmendem Bunddurchmesser kontinuierlich größer bzw. kleiner. Im Ausführungsfall der periodischen Aufschaltung einer Zusatzkraft erhöht sich ebenfalls kontinuierlich die konstante Kraft, die Zusatzkraft nicht.Furthermore, it can be provided that the force is changed depending on the collar diameter of the rolling stock on the Steckeltrommel. That is, the force remains e.g. During a revolution of the Steckel drum is substantially constant and is continuously larger or smaller with increasing collar diameter. In the case of execution of the periodic connection of an additional force also continuously increases the constant force, the additional power not.
In einer gegebenen Position der Rolle stehen die Kraft auf die Rolle und die durch den Bandzug und die Umschlingung des Walzguts auf die Rolle ausgeübte Kraft im Gleichgewicht. Wenn nun der Bunddurchmesser ansteigt oder abfällt, ändert sich die räumliche Lage des Walzguts zwischen Rolle und Steckeltrommel und damit auch das Kräftegleichgewicht, sodass zur Wiederherstellung des früheren Kräftegleichgewichts die Kraft auf die Rolle oder die räumliche Lage der Rolle geändert wird. Die notwendige Änderung der Kraft kann aus dem Kräfteparallelogramm gebildet aus den Kräften auf die Rolle (Bandzug und Anstellkraft auf die Rolle) bestimmt bzw. berechnet werden.In a given position of the roll, the force on the roll and the force exerted on the roll by the strip tension and the wrapping of the rolling stock are in equilibrium. Now, if the collar diameter increases or decreases, the spatial position of the rolling stock between roller and Steckeltrommel and thus the balance of power changes so that the force on the role or the spatial position of the role is changed to restore the former balance of power. The necessary change in the force can be determined or calculated from the force parallelogram from the forces acting on the roll (strip tension and contact force on the roll).
Es ergeben sich also zwei mögliche Lösungen: Entweder die Kraft auf die Rolle ist nur von der Bandzugresultierenden zu einem bestimmten Zeitpunkt abhängig und damit über die gesamte Haspeldauer im Wesentlichen konstant (abgesehen von der gegebenenfalls aufgebrachten periodischen Zusatzkraft), dann wird z.B. beim Aufhaspeln durch den zunehmenden Bunddurchmesser die Bandzugresultierende an der Rolle immer größer, die Rolle wird immer weiter aus dem Weg des Walzguts gedrängt. Die Position der Rolle ist somit - abgesehen von der Auslenkung aufgrund der Flachstelle der Steckeltrommel - variabel, die Rolle wandert kontinuierlich von einer Anfangsposition am Beginn des Haspelvorganges zu einer Endposition am Ende des Haspelvorganges.Thus, there are two possible solutions: Either the force on the roller depends only on the tape tension at a certain point in time and thus substantially constant over the entire take-up time (apart from the optionally applied periodic additional force). when rewinding due to the increasing collar diameter, the tape tension on the roller getting larger, the role is pushed further and further out of the way of the rolling stock. The position of the roller is thus - apart from the deflection due to the flat position of the Steckeltrommel - variable, the roller moves continuously from an initial position at the beginning of the reeling process to an end position at the end of the reeling process.
Oder die Kraft auf die Rolle wird sowohl in Abhängigkeit vom Bandzug als auch vom Bunddurchmesser vorgegeben, dann kann die Kraft so gewählt werden, dass sie der momentanen Bandzugresultierenden das Gleichgewicht hält und die Rolle nur während der Bandzugsschwankung kurzzeitig ihre Position ändert und anschließend wieder in die Ausgangslage vor der Bandzugsschwankung zurückehrt. Damit bleibt die räumliche Position der Rolle während des gesamten Auf- bzw. Abhaspelvorganges - abgesehen von der Auslenkung aufgrund der Flachstelle der Steckeltrommel - fix.Or the force on the role is given both in dependence on the strip tension and the diameter of the collar, then the force can be chosen so that it balances the momentary Bandzugresultierenden and the role only during the Bandzugsschwankung briefly changes their position and then back into the starting position zurückstehrt before the Bandzugsschwankung. Thus, the spatial position of the roller during the entire winding or Abhaspelvorganges - apart from the deflection due to the flat position of the Steckel drum - fixed.
Die Kraft wird in der Regel so gewählt, dass diese die durch den vorgegebenen Bandzug auf die Rolle ausgeübte Kraft in einer vorgegebenen Position der Rolle aufhebt. Im ersten Fall der variablen Position der Rolle bestimmt man die notwendige Kraft aufgrund der geometrischen Verhältnisse (Anordnung des Walzgutes relativ zur Rolle) z.B. am Beginn des Haspelvorganges aufgrund des vorgegebenen Bandzuges aus dem Kräfteparallelogramm.The force is usually chosen so that it cancels the force exerted by the predetermined strip tension on the roller force in a predetermined position of the roller. In the first case of the variable position of the roll one determines the necessary force due to the geometrical conditions (arrangement of the rolled material relative to the roll) e.g. at the beginning of the reeling process due to the predetermined strip tension from the parallelogram of forces.
Im zweiten Fall der fixen Position der Rolle wird die Kraft auf die Rolle während des Haspelvorganges laufend an die sich ändernden geometrischen Verhältnisse aufgrund der Zu- oder Abnahme des Bunddurchmessers der auf die Rolle jeweils wirkenden Bandzugresultierenden mit Hilfe des Kräfteparallelogramms angepasst.In the second case of the fixed position of the roll, the force on the roll during the coiling process is continuously adapted to the changing geometrical conditions due to the increase or decrease in the diameter of the band tensioning effect on the roll with the aid of the parallelogram of forces.
Dass die Rolle und/oder deren Lager, wie etwa ein Schwenkarm, hydraulisch angestellt wird, hat den Vorteil, dass die Anstellung im Vergleich zur pneumatischen Anstellung oder zur Anstellung mittels eines Motors rascher und genauer erfolgen kann.The fact that the roller and / or its bearings, such as a swivel arm, is hydraulically operated, has the advantage that the employment can be faster and more accurate compared to the pneumatic employment or employment by means of an engine.
Dadurch, dass die Rolle im Wesentlichen normal zur Ebene des zwischen Steckeltrommel und Treiber befindlichen Walzguts bewegt wird, wird mit geringer Auslenkung der Rolle ein größtmöglicher Effekt erzielt. Die Anstellung der Rolle kann aber durch schräg zu dieser Ebene ausgerichtete Anstellzylinder bewirkt werden.Due to the fact that the roller is moved substantially normal to the plane of the rolling stock between the driver and the driver, the largest possible effect is achieved with a low deflection of the roller. However, the employment of the role can be effected by obliquely aligned to this plane adjusting cylinder.
Die Vorrichtung zur Durchführung des Verfahrens kann zumindest einen vorzugsweise hydraulischen Anstellzylinder umfassen, der an der Lagerung der Rolle, etwa einem Schwenkarm, angreift.The device for carrying out the method may comprise at least one preferably hydraulic setting cylinder, which acts on the bearing of the roller, such as a swivel arm.
Der Anstellzylinder verfügt vorteilhafterweise über eine Positionsmesseinrichtung, zur Bestimmung der Startposition und zur Kontrolle der Position der Rolle während des Haspelvorganges.The adjusting cylinder advantageously has a position measuring device, for determining the starting position and for controlling the position of the roller during the coiling operation.
Weiters kann der Anstellzylinder sowohl Stangenseitig als auch Kolbenseitig über eine Druckmesseinrichtung verfügen, was den Vorteil hat, dass die tatsächlichen Drücke überwacht werden können.Furthermore, the adjusting cylinder can have both a rod side and a piston side via a pressure measuring device, which has the advantage that the actual pressures can be monitored.
Damit mit der erfindungsgemäßen Rolle Bandzugsschwankungen rasch ausgeglichen werden können, ist eine Rolle vorzusehen, die eine geringe Massenträgheit aufweist. Hierfür kann vorgesehen werden, dass die Rolle als Rohr ausgestaltet ist. Als ausreichend stabil wird ein Verhältnis aus Wandstärke des Rohrs zu äußerem Rohrdurchmesser von etwa 1:10 angesehen.In order to be able to rapidly compensate for strip tension variations with the roll according to the invention, it is necessary to provide a roll which has a low mass inertia. For this purpose, it can be provided that the role is designed as a tube. As sufficiently stable, a ratio of wall thickness of the pipe to outer pipe diameter of about 1:10 is considered.
Als vorteilhaft für die Hydraulik erweist es sich, wenn die Rolle auf einem Schwenkarm gelagert ist, an dem der Anstellzylinder angreift, wobei der Hebelarm des Anstellzylinders bezüglich der Achse des Schwenkarms kleiner ist als der Abstand zwischen Rollenachse und Achse des Schwenkarms. Dadurch muss der Anstellzylinder nur Bewegungen mit kleinerer Geschwindigkeit als jene der Rolle ausführen, sodass Anstellzylinder mit kleineren Ventilen und kürzeren Schaltzeiten verwendet werden können.It proves to be advantageous for the hydraulic, when the roller is mounted on a pivot arm, which acts on the Anstellzylinder, wherein the lever arm of the Anstellzylinders with respect to the axis of the pivot arm is smaller than the distance between the roller axis and the axis of the pivot arm. As a result, the adjusting cylinder only has to perform movements at a lower speed than that of the roller, so that adjusting cylinders can be used with smaller valves and shorter switching times.
Die Erfindung wird anhand eines Beispiels durch die folgenden
-
Fig. 1 zeigt eine schematische Darstellung eines Steckelwalzwerks. -
Fig. 2 zeigt die Stellung der Rolle vor und während eines Bandzugabfalls beim Aufhaspeln. -
Fig. 3 zeigt die Stellung der Rolle vor und während eines Bandzuganstiegs beim Abhaspeln.
-
Fig. 1 shows a schematic representation of a Steckel mill. -
Fig. 2 shows the position of the roll before and during a Bandzugabfall during coiling. -
Fig. 3 shows the position of the roll before and during a Bandzuganstiegs during unwinding.
Gemäß
In Position b) hat sich der Bandzug bereits verringert, Die Rolle 3 wurde durch den Anstellzylinder 8 bereits abgesenkt, um den Bandzugabfall abzufangen. Durch die Geometrie der Anstellvorrichtung reduziert sich das Anstellmoment bei konstanter Zylinderkraft.In position b), the strip tension has already decreased, the
Rechts unten in
Die Antriebsregelung der Steckeltrommel 1 reagiert auf den Bandzugabfall durch eine Erhöhung der Drehzahl und die Rolle 3 wird in die Nulllage vor dem Bandzugabfall zurückgezogen. Dadurch ist sichergestellt, dass die Rolle 3 beim Aufhaspeln immer in die Ausgangsstellung der Rolle vor Durchlauf der Flachstelle zurückkehrt, vorausgesetzt, dass die Kraft auf die Rolle 3 der momentanen Bandzugresultierenden (als Funktion des Bunddurchmessers) angepasst wird. Andernfalls (variable Position-der-Rolle) gilt, dass die Rolle entsprechend der konstanten Kraft des Anstellzylinders 8 kontinuierlich von einer unteren Position zu einer oberen Position ansteigt.The drive control of the Steckel drum 1 reacts to the Bandzugabfall by increasing the speed and the
Beim Aufhaspeln kommt es durch die Flachstelle der Steckeltrommel 1 zu einer Verlängerung des Walzguts 6 und damit zu einem Bandzugsabfall. Die Rolle 3 wird durch das Walzgut 6 abgesenkt.When reeling it comes through the flat position of the Steckel drum 1 to an extension of the
Die Geometrie der Anlenkung des hydraulischen Anstellzylinders 8 wurde so gewählt, dass der Hebelarm der Zylinderkraft bezogen auf den Schwerpunkt des Schwenkarmes 4 verringert wird und dadurch trotz Auslenken des Schwenkarmes 4 der Bandzug geringfügig reduziert wird. Auf diese Reduzierung reagiert die Drehmomentregelung der Steckeltrommel 1 mit einer Erhöhung der Drehzahl, bis der Soll-Bandzug wieder hergestellt ist. Die Rolle 3 wird dadurch in ihre Position vor der Bandzugreduzierung zurückgestellt.The geometry of the articulation of the
Beim Abhaspeln kommt es durch die Flachstelle der Steckeltrommel 1 zu einer Verkürzung des Walzguts 6 und damit zu einer Bandzugerhöhung. Die Rolle 3 wird durch das Walzgut 6 angehoben.When unwinding it comes through the flat part of the Steckel drum 1 to a shortening of the
Die Geometrie der Anlenkung des hydraulischen Anstellzylinders wurde so gewählt, dass der Hebelarm der Zylinderkraft bezogen auf den Schwerpunkt des Schwenkarmes 4 vergrößert wird und dadurch trotz Auslenken des Schwenkarmes 4 der Bandzug geringfügig erhöht wird. Auf diese Erhöhung reagiert die Drehmomentregelung der Steckeltrommel 1 mit einer Verringerung der Drehzahl, bis der Soll-Bandzug wieder hergestellt ist. Die Rolle 3 wird dadurch in ihre Position vor der Bandzugerhöhung zurückgestellt.The geometry of the articulation of the hydraulic adjusting cylinder was chosen so that the lever arm of the cylinder force is increased relative to the center of gravity of the pivot arm 4 and thereby slightly increased despite deflection of the pivot arm 4 of the strip tension. In response to this increase, the torque control of the Steckel drum 1 reacts with a reduction in the speed until the desired strip tension is restored. The
Dadurch ist sichergestellt, dass die Rolle 3 beim Abhaspeln in die Ausgangsstellung der Rolle vor Durchlauf der Flachstelle zurückkehrt, vorausgesetzt, dass die Kraft auf die Rolle 3 der momentanen Bandzugresultierenden angepasst wird. Andernfalls (variable Position der Rolle) gilt, dass die Rolle entsprechend der konstanten Kraft des Anstellzylinders 8 kontinuierlich von einer oberen Position zu einer unteren Position wandertThis ensures that the
Die Regelung der anderen Steckeltrommel auf der anderen Seite des Walzgerüsts erfolgt analog - jeweils eine Steckeltrommel wickelt auf, die andere wickelt ab, ausgenommen der erste und der letzte Stich, wo jeweils nur eine Steckeltrommel zum Einsatz kommt.The regulation of the other Steckeltrommel on the other side of the rolling stand is analogous - each a Steckel drum wound up, the other unwinds, except the first and the last stitch, where only one Steckel drum is used.
- 11
- SteckeltrommelSteckel drum
- 22
- Treiberdriver
- 33
- Rollerole
- 44
- Schwenkarmswivel arm
- 55
- Walzgerüstrolling mill
- 66
- Walzgutrolling
- 77
- Einfädelschlitzthreading slot
- 88th
- AnstellzylinderAdjusting cylinder
- 99
- Schwenkachseswivel axis
- 1010
- BandzugBandzug
- 1111
- Kraft auf die RolleForce on the role
- 1212
- Bewegungsrichtung der RolleDirection of movement of the roll
Claims (15)
- Method for reducing vibrations due to a flat spot on a Steckel roll (1) in a Steckel mill, an advanceable roll (3), which is brought into engagement with the rolling stock (6), being arranged between the Steckel roll (1) of the Steckel furnace and the driver (2) of the roll stand (5), characterized in that the force which the roll (3) exerts on the rolling stock (6) is regulated to a predetermined value.
- Method according to Claim 1, characterized in that the force is kept constant during one or more revolutions of the Steckel roll (1).
- Method according to Claim 1, characterized in that an additional force is added during a specific timespan of each revolution to a force which is constant for the duration of one or more revolutions of the Steckel roll (1).
- Method according to one of Claims 1 to 3, characterized in that the force is changed as a function of the coil diameter of the rolling stock (6) on the Steckel roll (1).
- Method according to one of Claims 1 to 4, characterized in that the force is selected such that, in a predetermined position of the roll, this force cancels the force exerted on the roll by the predetermined strip tension.
- Method according to one of Claims 1 to 5, characterized in that the roll (3) and/or its mounting, such as, for example, a pivoting arm (4), are advanced hydraulically.
- Method according to one of Claims 1 to 6, characterized in that the roll (3) is moved essentially perpendicularly with respect to the plane of the rolling stock (6) located between the Steckel roll (1) and the driver (2).
- Device for carrying out the method according to one of Claims 1 to 7, consisting at least of an advanceable roll (3) which is arranged between the Steckel roll (1) and the driver (2) of the roll stand (5), so that said roll can be brought into engagement with the rolling stock (6), characterized in that a device (4, 8) is provided, by means of which the force which the roll (3) exerts on the rolling stock (6) can be regulated to a predetermined value.
- Device according to Claim 8, characterized in that the device comprises at least one preferably hydraulic advancing cylinder (8) which engages on the mounting of the roll (3), for example a pivoting arm (4).
- Device according to Claim 9, characterized in that the advancing cylinder (8) has a position measurement device.
- Device according to either one of Claims 9 and 10, characterized in that the advancing cylinder (8) has a pressure measurement device both on the rod side and on the piston side.
- Device according to one of Claims 8 to 11, characterized in that the roll (3) can be moved essentially perpendicularly with respect to the plane of the rolling stock (6) located between the Steckel roll (1) and driver (2).
- Device according to one of Claims 8 to 12, characterized in that the roll is designed as a tube.
- Device according to one of Claims 9 to 13, characterized in that the roll (3) is mounted on the pivoting arm (4) on which the advancing cylinder (8) engages, the lever arm of the advancing cylinder (8) with respect to the axis (9) of the pivoting arm being smaller than the distance between the roll axis and the axis of the pivoting arm.
- Device according to one of Claims 8 to 14, characterized in that the device (4, 8) is arranged such that the advancing moment is reduced in the event of a strip tension drop and the advancing moment is increased in the event of a strip tension rise.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT05752303T ATE414574T1 (en) | 2004-07-07 | 2005-06-17 | METHOD AND DEVICE FOR REDUCING VIBRATIONS IN A STECKEL ROLLING MILL |
PL05752303T PL1763410T3 (en) | 2004-07-07 | 2005-06-17 | Method and device for reducing vibrations in a steckel mill |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0114404A AT502723B1 (en) | 2004-07-07 | 2004-07-07 | METHOD AND DEVICE FOR REDUCING VIBRATIONS IN A SLIDING ROLLER |
PCT/EP2005/006561 WO2006002783A1 (en) | 2004-07-07 | 2005-06-17 | Method and device for reducing vibrations in a steckel mill |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1763410A1 EP1763410A1 (en) | 2007-03-21 |
EP1763410B1 true EP1763410B1 (en) | 2008-11-19 |
Family
ID=34970395
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05752303A Revoked EP1763410B1 (en) | 2004-07-07 | 2005-06-17 | Method and device for reducing vibrations in a steckel mill |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP1763410B1 (en) |
JP (2) | JP2008504969A (en) |
CN (1) | CN1984729B (en) |
AT (2) | AT502723B1 (en) |
BR (1) | BRPI0513148A (en) |
CA (1) | CA2572986A1 (en) |
DE (1) | DE502005006011D1 (en) |
PL (1) | PL1763410T3 (en) |
WO (1) | WO2006002783A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007005378A1 (en) | 2007-02-02 | 2008-08-07 | Siemens Ag | Operating method for a reel device for winding or unwinding a tape and control device and reel device for this purpose |
AT506398B1 (en) | 2008-06-18 | 2009-09-15 | Siemens Vai Metals Tech Gmbh | METHOD AND DEVICE FOR SUPPRESSING VIBRATIONS IN A ROLLING SYSTEM |
CN104226727A (en) * | 2014-09-26 | 2014-12-24 | 武汉钢铁(集团)公司 | Control method of coefficient-variable uncoiler |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60231516A (en) * | 1984-04-28 | 1985-11-18 | Sumitomo Metal Ind Ltd | Coiler having looper mechanism |
JPS6333116A (en) * | 1986-07-25 | 1988-02-12 | Hitachi Ltd | Furnace coiler winding control method |
JPH10180327A (en) * | 1996-12-20 | 1998-07-07 | Nisshin Steel Co Ltd | Tension control method for chip end and tail end of strip in steckel mill |
DE19818207C2 (en) * | 1998-04-23 | 2000-05-31 | Schloemann Siemag Ag | Steckel hot rolling mill |
GB0020160D0 (en) * | 2000-08-17 | 2000-10-04 | Vai Ind Uk Ltd | Steckel furnace coiler and apparatus therefor |
DE10133756A1 (en) * | 2001-07-11 | 2003-01-30 | Sms Demag Ag | Cold rolling mill and method for cold rolling metallic strip |
CN1152755C (en) * | 2001-08-20 | 2004-06-09 | 燕山大学 | Composite roll system with controllable small opening for rolling mill |
RU2336960C2 (en) * | 2002-12-14 | 2008-10-27 | Смс Демаг Акциенгезелльшафт | Method and installation for hot rolling of bars in steckel rolling mill |
UA79184C2 (en) * | 2002-12-14 | 2007-05-25 | Sms Demag Ag | Method and installation for hot-rolling strips using reversible steckel rolling frame |
-
2004
- 2004-07-07 AT AT0114404A patent/AT502723B1/en not_active IP Right Cessation
-
2005
- 2005-06-17 DE DE502005006011T patent/DE502005006011D1/en active Active
- 2005-06-17 PL PL05752303T patent/PL1763410T3/en unknown
- 2005-06-17 BR BRPI0513148-0A patent/BRPI0513148A/en not_active IP Right Cessation
- 2005-06-17 JP JP2007519652A patent/JP2008504969A/en not_active Ceased
- 2005-06-17 EP EP05752303A patent/EP1763410B1/en not_active Revoked
- 2005-06-17 WO PCT/EP2005/006561 patent/WO2006002783A1/en active Application Filing
- 2005-06-17 CN CN2005800230765A patent/CN1984729B/en not_active Expired - Fee Related
- 2005-06-17 CA CA002572986A patent/CA2572986A1/en not_active Abandoned
- 2005-06-17 AT AT05752303T patent/ATE414574T1/en not_active IP Right Cessation
-
2012
- 2012-03-22 JP JP2012065725A patent/JP2012110969A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
AT502723B1 (en) | 2008-08-15 |
AT502723A1 (en) | 2007-05-15 |
EP1763410A1 (en) | 2007-03-21 |
JP2012110969A (en) | 2012-06-14 |
BRPI0513148A (en) | 2008-04-29 |
DE502005006011D1 (en) | 2009-01-02 |
CN1984729A (en) | 2007-06-20 |
CN1984729B (en) | 2010-06-16 |
JP2008504969A (en) | 2008-02-21 |
CA2572986A1 (en) | 2006-01-12 |
ATE414574T1 (en) | 2008-12-15 |
WO2006002783A1 (en) | 2006-01-12 |
PL1763410T3 (en) | 2009-04-30 |
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