EP0839587A1 - Method for rolling thick plates - Google Patents

Method for rolling thick plates Download PDF

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Publication number
EP0839587A1
EP0839587A1 EP97118206A EP97118206A EP0839587A1 EP 0839587 A1 EP0839587 A1 EP 0839587A1 EP 97118206 A EP97118206 A EP 97118206A EP 97118206 A EP97118206 A EP 97118206A EP 0839587 A1 EP0839587 A1 EP 0839587A1
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EP
European Patent Office
Prior art keywords
strip
rolling
stitch
head
pass
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Granted
Application number
EP97118206A
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German (de)
French (fr)
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EP0839587B1 (en
Inventor
Stephan Krämer
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SMS Siemag AG
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SMS Schloemann Siemag AG
Schloemann Siemag AG
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Publication of EP0839587A1 publication Critical patent/EP0839587A1/en
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Classifications

    • 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
    • B21B1/222—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 rolling-drawing process; in a multi-pass mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/24—Automatic variation of thickness according to a predetermined programme
    • 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
    • B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
    • 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
    • B21B37/58—Roll-force control; Roll-gap control
    • 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
    • B21B1/02—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 heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
    • B21B1/026—Rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/12—Rolling load or rolling pressure; roll force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/14—Reduction rate

Definitions

  • the invention is directed to a method for rolling heavy plates from a primary material in several successive work steps, with a different number "n" of passes in one or more rolling stands, preferably in a hot reversing stand, depending on the desired end product.
  • the object is achieved with the measures of the characterizing part of claim 1 in a method for rolling heavy plates from a primary material in several successive work steps, with a different number "n" of passes in one or more rolling stands, preferably depending on the desired end product in a hot reversing stand, in that from the stitch n - k to the stitch n - 1 (where k is a count number that is in the range from 1 to n - 1), higher stitch decreases (smaller sheet thicknesses) are rolled at the strip head than at the end of the strip .
  • the reduction in the number of passes from the strip head to the strip end - corresponding to the increase in the rolled sheet thickness from the strip head to the strip end - is constant, i. H. linear.
  • the control of the required sheet thickness is possible in a particularly simple manner with the aid of the control systems.
  • the difference in thickness between the strip head and the end of the strip is set according to the invention to a smaller amount with each subsequent pass, so that in accordance with the decrease in the average sheet thickness as a result of the rolling progress, the difference in thickness relative to sheet thickness remains approximately constant and, based on the sheet thickness, approximately is in the range of 1-5%.
  • the measure according to the invention of increasing the sheet thickness from the strip head to the end of the strip starts from a stitch n - k, where k is a count from 1 to n - 1.
  • the measure ends with the last stitch, in which the thickness difference from the previous stitch is equalized and a parallel band, the end product, is generated.
  • FIG. 1 shows the entire rolling process with a total of eleven passes in a coordinate system with the rolling forces (RF) in 1,000 kN as the ordinate and the rolling time (t) in seconds as the abscissa.
  • FIG. 2 shows the result of a rolling process according to the method of the invention under otherwise the same conditions as in the rolling process of FIG. 1.
  • the temperature-related difference in rolling force between the strip head and the strip end is significantly reduced by increasing the stitch decrease on the strip head.
  • This difference for the tenth stitch (10) is only 10,000 kN and for the last stitch (11) only 12,000 kN.
  • the rolling force differences are reduced by approx. 50%.
  • the maximum rolling force values for the last pass are also significantly lower than with the methods previously used, as the following comparison shows: Stitch no. k number maximum rolling force in kN previous author
  • the invention 7 4th 48,500 49,000 8th 3rd 55,000 55,500 9 2nd 71,000 65,000 10th 1 76,000 65,000 11 0 63,000 55,000
  • the strip in the last stitches, is rolled out with different thicknesses, specifically at the strip head with a smaller thickness, which then leads to the end of the strip increases linearly or non-linearly again according to a certain predetermined mathematical function, not only are the rolling force differences between the strip head and the strip end reduced, but also the maximum rolling forces per pass are reduced.
  • this also has a particularly favorable effect on the service life of the wearing parts of the rolling mill and on the rolling energy requirement.
  • the invention is not limited to the exemplary embodiment described in the drawing figures and also not applicable to rolling in reversing stands, but in general can also advantageously be used for rolling in multiple passes, which are carried out in succession, as well as for rolling in roughing and finishing lines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Control Of Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Container, Conveyance, Adherence, Positioning, Of Wafer (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

The method concerns rolling of thick sheet metal from a preliminary material in several successive stages, with different numbers of passes (n) according to a particular desired end product, in one or several roll stands, but preferably in a single hot revers-ing stand. The method is characterised by the fact that from a pass (n-k) onwards to a pass (n-1), where k lies in the range from 1 to n-1, the pass reductions produced at the beginning of the strip are greater than those produced at the end of the strip.

Description

Die Erfindung ist auf ein Verfahren zum Walzen von Grobblechen aus einem Vormaterial in mehreren hintereinander geschalteten Arbeitsschritten gerichtet, mit einer je nach dem gewünschten Endprodukt unterschiedlichen Anzahl "n" von Stichen in einem oder mehreren Walzgerüsten, vorzugsweise in einem Warmreversiergerüst.The invention is directed to a method for rolling heavy plates from a primary material in several successive work steps, with a different number "n" of passes in one or more rolling stands, preferably in a hot reversing stand, depending on the desired end product.

Beim Walzen von Grobblechen aus einem Vormaterial in einem Grobblechwalzgerüst, vorzugsweise in einem Warmreversiergerüst, bestehen Entwicklungstendenzen, aus Gründen der Maximierung von Produktivität und Ausbringung (Minimierung der Seiten- und Enden-Schopfverluste), möglichst lange Bleche zu walzen. Aufgrund der hierbei üblichen Prozeßführung ergeben sich beim Warmreversierwalzen bei relativ kleinen Enddicken - besonders in den letzten Stichen - sehr große Walzkraftunterschiede zwischen Bandkopf und Bandende, die bis zu beispielsweise 25.000 kN betragen können. Ursache ist die bei langen Bändern wegen der stattfindenden Abkühlung niedrigere Walzguttemperatur am Bandende, wodurch die Walzarbeit bzw. die Walzkraft ansteigt.When rolling heavy plates from a primary material in a heavy plate mill stand, preferably in a hot reversing stand, there are development tendencies, for reasons of maximizing productivity and output (minimizing side and end cropping losses), of rolling long plates as long as possible. Due to the usual process control, there are very large differences in rolling force between strip head and strip end, which can be up to 25,000 kN, for example, in hot reversing rolling with relatively small final thicknesses - especially in the last pass. The reason for this is the lower temperature of the rolled material at the end of the strip due to the cooling taking place, which increases the rolling work or the rolling force.

Um den Auswirkungen dieser stattfindenden Abkühlung während des Walzens in hintereinander erfolgenden Stichen zu begegnen, wird in der Patentanmeldung WO-A-89/11363 vorgeschlagen, zumindest nach dem ersten Verformungsschritt das Walzgut wieder aufzuwärmen, vorzugsweise mittels Induktionsheizung und dann erst den zweiten Verformungsschritt durchzuführen. Dieses Verfahren ist aber sehr kostenintensiv, da zu diesem Zweck ein entsprechender Ofen installiert werden und zusätzliche elektrische Energie aufgewendet werden muß. Außerdem ist dieses Verfahren nur sehr schwierig auf das Reversierwalzen anzuwenden.To see the effects of this cooling taking place during To counter the rolling in successive passes, it is proposed in patent application WO-A-89/11363 to reheat the rolling stock at least after the first deformation step, preferably by means of induction heating and only then to carry out the second deformation step. However, this process is very cost-intensive, since an appropriate oven must be installed for this purpose and additional electrical energy must be used. In addition, this process is very difficult to apply to reversing rolling.

Es ist Aufgabe der Erfindung, ein Verfahren zu schaffen, mit dem die geschilderten Nachteile beim Walzen in mehreren aufeinanderfolgenden Walzstichen ohne zusätzliche Investitions- und Energiekosten zu verursachen, vermieden bzw. wesentlich vermindert werden können.It is an object of the invention to provide a method with which the disadvantages described can be avoided or substantially reduced when rolling in several successive rolling passes without causing additional investment and energy costs.

Die gestellte Aufgabe wird gelöst mit den Maßnahmen des Kennzeichnungsteils des Anspruchs 1 bei einem Verfahren zum Walzen von Grobblechen aus einem Vormaterial in mehreren hintereinander geschalteten Arbeitsschritten, mit einer je nach dem gewünschten Endprodukt unterschiedlichen Anzahl "n" von Stichen in einem oder mehreren Walzgerüsten, vorzugsweise in einem Warmreversiergerüst, dadurch, daß ab dem Stich n - k bis zum Stich n - 1 (wobei k eine Zählzahl ist, die im Bereich von 1 bis n - 1 liegt) am Bandkopf höhere Stichabnahmen (geringere Blechdicken) gewalzt werden als am Bandende.The object is achieved with the measures of the characterizing part of claim 1 in a method for rolling heavy plates from a primary material in several successive work steps, with a different number "n" of passes in one or more rolling stands, preferably depending on the desired end product in a hot reversing stand, in that from the stitch n - k to the stitch n - 1 (where k is a count number that is in the range from 1 to n - 1), higher stitch decreases (smaller sheet thicknesses) are rolled at the strip head than at the end of the strip .

Durch die erfindungsgemäße Maßnahme, die Verläufe der Blechdicken ab einem Stich n - k in den nachfolgenden Stichen so zu gestalten, daß jeweils am Bandkopf höhere Abnahmen gefahren werden als am Bandende, wird bewirkt, daß die Walzkräfte am Bandkopf angehoben, am Bandende des nachfolgenden Stiches jedoch abgesenkt werden. Es ergibt sich hierdurch insgesamt bei diesen Stichen, bei denen in dieser Weise verfahren wird, eine Vergleichmäßigung der Walzkraftunterschiede je Stich. Weiterhin werden insgesamt Walzkraftspitzen abgebaut, da am Bandende eines Stiches nun der "dünnere" Bandkopf des vorhergehenden Stiches gewalzt wird. Die Reduzierung der Walzkraftunterschiede sowie der Abbau der absoluten Walzkraftspitzenwerte bewirkt mit Vorteilen

  • eine Verringerung der Anforderungen an die Stellsysteme zur Beeinflussung der Blechtoleranzen hinsichtlich Blechdicke, Blechprofil und Planheit des Bleches,
  • eine Verbesserung dieser Toleranzwerte selbst, da bisherige Stellgrenzen nicht mehr erreicht werden,
  • eine Erweiterung des Produktionsspektrums, da nun Walzkraftspitzen, die bisher dazu führten, daß ein Produkt nicht mehr darstellbar war, vermieden werden.
By the measure according to the invention, the courses of the sheet thicknesses from one stitch n - k in the subsequent stitches are designed in such a way that in each case higher strip head Decreases are driven than at the end of the strip, causing the rolling forces on the strip head to be increased, but to be reduced at the end of the strip of the subsequent pass. This results in an overall equalization of the rolling force differences per stitch for these passes, which are operated in this way. Furthermore, a total of rolling force peaks are reduced, since the "thinner" strip head of the previous pass is now rolled at the end of a pass. The reduction of the rolling force differences and the reduction of the absolute rolling force peak values have advantages
  • a reduction in the requirements for the actuating systems to influence the sheet metal tolerances with regard to sheet thickness, sheet profile and flatness of the sheet,
  • an improvement of these tolerance values themselves, since previous setting limits are no longer reached,
  • an expansion of the production spectrum, since now peak rolling forces, which previously led to the fact that a product could no longer be produced, are avoided.

Gemäß einer vorteilhaften Ausgestaltung der Erfindung verläuft die Verringerung der Stichabnahmen vom Bandkopf zum Bandende - entsprechend der Anstieg der gewalzten Blechdicke von Bandkopf zu Bandende - stetig, d. h. linear. Auf diese Weise ist die Regelung der geforderten Blechdicke in besonders einfacher Weise mit Hilfe der Stellsysteme möglich.According to an advantageous embodiment of the invention, the reduction in the number of passes from the strip head to the strip end - corresponding to the increase in the rolled sheet thickness from the strip head to the strip end - is constant, i. H. linear. In this way, the control of the required sheet thickness is possible in a particularly simple manner with the aid of the control systems.

Es ist aber auch gemäß der Erfindung möglich, vom Bandkopf zum Bandende eine andere, nichtlineare Verringerung der Stichabnahmen bzw. Zunahmen der gewalzten Blechdicke durchzuführen, beispielsweise in Form einer anderen vorgegebenen mathematischen Funktion, wenn dies für die Handhabung der Prozeßführung im Hinblick auf das geforderte Endprodukt von Vorteil ist.But it is also possible according to the invention, from the tape head to perform a different, non-linear reduction in the number of passes or increases in the rolled sheet thickness at the end of the strip, for example in the form of another predetermined mathematical function, if this is advantageous for handling the process control with regard to the required end product.

Die Dickendifferenz zwischen dem Bandkopf und dem Bandende wird gemäß der Erfindung mit jedem folgenden Stich auf einen kleineren Betrag eingestellt, so daß entsprechend der Abnahme der mittleren Blechdicke infolge des Walzfortschritts die Dickendifferenz relativ zu Blechdicke in etwa konstant bleibt und, bezogen auf die Blechdicke, etwa im Bereich von 1 - 5 % liegt.The difference in thickness between the strip head and the end of the strip is set according to the invention to a smaller amount with each subsequent pass, so that in accordance with the decrease in the average sheet thickness as a result of the rolling progress, the difference in thickness relative to sheet thickness remains approximately constant and, based on the sheet thickness, approximately is in the range of 1-5%.

Die erfindungsgemäße Maßnahme, die Blechdicke vom Bandkopf zum Bandende ansteigen zu lassen, beginnt ab einem Stich n - k, wobei k eine Zählzahl von 1 bis n - 1 ist. Mit dieser Maßnahme kann demnach ab dem ersten Stich begonnen werden (k = n - 1) oder entsprechend später, d. h. mit dem zweiten, dritten oder vierten Stich usw. Die Maßnahme endet beim letzten Stich, bei dem die vom, vorhergehenden Stich noch anstehende Dickendifferenz egalisiert und ein paralleles Band, das Endprodukt, erzeugt wird.The measure according to the invention of increasing the sheet thickness from the strip head to the end of the strip starts from a stitch n - k, where k is a count from 1 to n - 1. This measure can therefore be started from the first stitch (k = n - 1) or accordingly later, i.e. H. with the second, third or fourth stitch etc. The measure ends with the last stitch, in which the thickness difference from the previous stitch is equalized and a parallel band, the end product, is generated.

Die Erfindung wird nachfolgend an einem Ausführungsbeispiel in Diagrammen näher erläutert.The invention is explained in more detail below using an exemplary embodiment in diagrams.

Es zeigen:

Fig. 1
einen schematischen Stichplan eines Walzvorganges mit elf Stichen nach dem Stand der Technik,
Fig. 2
einen schematischen Stichplan eines Walzvorganges mit 11 Stichen nach dem Verfahren der Erfindung.
Show it:
Fig. 1
a schematic pass schedule of a rolling process with eleven passes according to the prior art,
Fig. 2
a schematic pass schedule of a rolling process with 11 passes according to the method of the invention.

In der Figur 1 sind in ein Koordinatensystem mit den Walzkräften (RF) in 1.000 kN als Ordinate und der Walzzeit (t) in Sekunden als Abszisse der gesamte Walzvorgang mit insgesamt elf Stichen dargestellt.FIG. 1 shows the entire rolling process with a total of eleven passes in a coordinate system with the rolling forces (RF) in 1,000 kN as the ordinate and the rolling time (t) in seconds as the abscissa.

Wie der Figur 1 zu entnehmen ist, ist ab dem neunten Stich (9) ein deutlicher Anstieg der Walzkräfte vom Bandkopf beginnend zum Bandende hin zu verzeichnen, hervorgerufen durch die stattfindende Abkühlung des Walzgutes, die im zehnten Stich (10) einen Walzkraftunterschied von 25.000 kN und im elften Stich (11) einen Walzkraftunterschied von 24.000 kN verursacht. Die absolute Walzkraftspitze wird im zehnten Stich (10) am Bandende mit 76.000 kN erreicht.As can be seen in FIG. 1, from the ninth pass (9) there is a significant increase in the rolling forces from the strip head to the end of the strip, caused by the cooling of the rolling stock which takes place in the tenth pass (10) and a difference in rolling force of 25,000 kN and caused a rolling force difference of 24,000 kN in the eleventh pass (11). The absolute rolling force peak is reached in the tenth pass (10) at the end of the strip with 76,000 kN.

In der Figur 2 wird das Ergebnis eines Walzvorganges nach dem Verfahren der Erfindung bei sonst gleichen Bedingungen wie bei dem Walzvorgang der Figur 1 dargestellt.FIG. 2 shows the result of a rolling process according to the method of the invention under otherwise the same conditions as in the rolling process of FIG. 1.

In diesem Ausführungsbei spiel der Figur 2 wurde ab dem siebten Stich (7), dies entspricht einer k-Zahl von 4, die Stichabnahme am Bandkopf angehoben und entsprechend zum Bandende hin reduziert, wodurch zum Bandende hin die Blechdicke angehoben wurde. Die resultierende Blechdickendifferenz zum Bandende betrug 0,6 mm. Im achten Stich (8) betrug die Blechdickendifferenz durch eine höhere Stichabnahme am Bandkopf (bei der nun insgesamt kleineren Blechdicke) 0,4 mm, beim neunten Stich (9) 0,2 mm und beim zehnten Stich (10) 0,1 mm. Im letzten Stich (11), bei dem ein paralleles Band als Fertigprodukt gewalzt wird, war demnach gleichfalls eine Dickendifferenz von 0,1 mm (aus dem zehnten Stich) durch eine höhere Stichaufnahme am Bandkopf auszugleichen. Der Verlauf der Dickenzunahme vom Bandkopf zum Bandende war bei allen Stichen linear.In this exemplary embodiment of FIG. 2, from the seventh stitch (7), this corresponds to a k number of 4, the stitch decrease at the strip head was increased and reduced accordingly towards the strip end, whereby the sheet thickness was increased towards the strip end. The resulting sheet thickness difference at the end of the strip was 0.6 mm. In the eighth stitch (8) the sheet thickness difference was 0.4 mm due to a higher stitch decrease at the strip head (for the sheet thickness that is now smaller overall), for the ninth stitch (9) 0.2 mm and for tenth stitch (10) 0.1 mm. In the last stitch (11), in which a parallel strip is rolled as a finished product, a thickness difference of 0.1 mm (from the tenth stitch) had to be compensated for by a higher stitch take-up on the strip head. The course of the increase in thickness from the tape head to the tape end was linear for all stitches.

Wie der Figur 2 weiter zu entnehmen ist, wird der temperaturbedingte Walzkraftunterschied zwischen dem Bandkopf und dem Bandende durch die Anhebung der Stichabnahme am Bandkopf deutlich verringert. So beträgt dieser Unterschied für den zehnten Stich (10) nur noch 10.000 kN und für den letzten Stich (11) nur noch 12.000 kN., d.h. gegenüber dem bisher üblichen Verfahren wird eine Reduzierung der Walzkraftunterschiede um ca. 50 % erreicht.As can further be seen in FIG. 2, the temperature-related difference in rolling force between the strip head and the strip end is significantly reduced by increasing the stitch decrease on the strip head. This difference for the tenth stitch (10) is only 10,000 kN and for the last stitch (11) only 12,000 kN. Compared to the previous method, the rolling force differences are reduced by approx. 50%.

Auch die maximalen Walzkraftwerte liegen bei den letzten Stichen deutlich niedriger als bei den bisher üblichen Verfahren, wie die folgende Gegenüberstellung zeigt: Stich-Nr. k-Zahl maximale Walzkraft in kN bisheriges Verf. Verf.n.d.Erfindung 7 4 48.500 49.000 8 3 55.000 55.500 9 2 71.000 65.000 10 1 76.000 65.000 11 0 63.000 55.000 The maximum rolling force values for the last pass are also significantly lower than with the methods previously used, as the following comparison shows: Stitch no. k number maximum rolling force in kN previous author The invention 7 4th 48,500 49,000 8th 3rd 55,000 55,500 9 2nd 71,000 65,000 10th 1 76,000 65,000 11 0 63,000 55,000

Durch die Maßnahme der Erfindung, in den letzten Stichen das Band mit unterschiedlicher Dicke auszuwalzen, und zwar am Bandkopf mit geringerer Dicke, die dann zum Bandende linear oder nicht linear nach einer bestimmten vorgegebenen mathematischen Funktion wieder ansteigt, werden nicht nur Walzkraftunterschiede zwischen Bandkopf und Bandende reduziert, sondern auch die maximalen Walzkräfte je Stich erniedrigt. Neben Vorteilen bei der Regelung mittels vorhandener Stellsysteme wird insbesondere dadurch auch ein günstiger Einfluß auf die Lebensdauer der Verschleißteile des Walzwerks wie auch auf dem Walzenergiebedarf bewirkt.By the measure of the invention, in the last stitches, the strip is rolled out with different thicknesses, specifically at the strip head with a smaller thickness, which then leads to the end of the strip increases linearly or non-linearly again according to a certain predetermined mathematical function, not only are the rolling force differences between the strip head and the strip end reduced, but also the maximum rolling forces per pass are reduced. In addition to advantages in the control by means of existing control systems, this also has a particularly favorable effect on the service life of the wearing parts of the rolling mill and on the rolling energy requirement.

Die Erfindung ist nicht auf das in den Zeichnungsfiguren beschriebene Ausführungsbeispiel beschränkt und auch nicht auf das Walzen in Reversiergerüsten, sondern generell mit Vorteil auch auf das Walzen in mehreren Stichen, die hintereinander durchgeführt werden, als auch auf das Walzen in Vor- und Fertigstraßen anwendbar.The invention is not limited to the exemplary embodiment described in the drawing figures and also not applicable to rolling in reversing stands, but in general can also advantageously be used for rolling in multiple passes, which are carried out in succession, as well as for rolling in roughing and finishing lines.

Claims (4)

Verfahren zum Walzen von Grobblechen aus einem Vormaterial mit mehreren hintereinander geschalteten Arbeitsschritten, mit einer je nach dem gewünschten Endprodukt unterschiedlichen Anzahl "n" von Stichen in einem oder meheren Walzgerüsten, vorzugsweise in einem Warmreversiergerüst, dadurch gekennzeichnet, daß ab dem Stich n - k bis zum Stich n - 1 (wobei k eine Zählzahl ist, die im Bereich von 1 bis n - 1 liegt) am Bandkopf höhere Stichabnahmen (geringere Blechdicken) gewalzt werden als am Bandende.Method for rolling heavy plates from a primary material with several work steps connected in series, with a different number "n" of passes in one or more rolling stands, preferably in a hot reversing stand, depending on the desired end product, characterized in that from the pass n - k to For the stitch n - 1 (where k is a count number that lies in the range from 1 to n - 1), higher stitch decreases (smaller sheet thicknesses) are rolled at the strip head than at the strip end. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Verringerung der Stichabnahmen bzw. die Zunahme der Blechdicke vom Bandkopf zum Bandende linear über die gesamte Bandlänge erfolgt.Method according to claim 1, characterized in that the reduction in the number of stitch decreases or the increase in the sheet thickness from the strip head to the strip end takes place linearly over the entire strip length. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Verringerung der Stichabnahmen bzw. die Zunahme der Blechdicke vom Bandkopf zum Bandende nichtlinear, sondern nach einer anderen vorgegebenen mathematischen Funktion über die gesamte Bandlänge erfolgt.A method according to claim 1, characterized in that the reduction in the number of passes or the increase in the sheet thickness from the strip head to the end of the strip is non-linear, but according to another predetermined mathematical function over the entire length of the strip. Verfahren nach einem oder mehreren der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Blechdickendifferenz zwischen dem Bandkopf und dem Bandende mit zunehmender Stichzahl, entsprechend abnehmender mittlerer Banddicke, abnimmt.Method according to one or more of claims 1 to 3, characterized in that the sheet thickness difference between the strip head and the strip end decreases with an increasing number of stitches, corresponding to a decreasing average strip thickness.
EP97118206A 1996-11-05 1997-10-21 Method for rolling thick plates Expired - Lifetime EP0839587B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19645497A DE19645497A1 (en) 1996-11-05 1996-11-05 Method of rolling heavy plates
DE19645497 1996-11-05

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EP0839587A1 true EP0839587A1 (en) 1998-05-06
EP0839587B1 EP0839587B1 (en) 2001-12-05

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US (1) US5943894A (en)
EP (1) EP0839587B1 (en)
JP (1) JP4263262B2 (en)
KR (1) KR100517714B1 (en)
AT (1) ATE209974T1 (en)
CA (1) CA2220412C (en)
DE (2) DE19645497A1 (en)
ES (1) ES2169310T3 (en)
ID (1) ID18570A (en)
MY (1) MY123098A (en)
RU (1) RU2203748C2 (en)
TW (1) TW338728B (en)

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CN107377629A (en) * 2017-06-28 2017-11-24 秦皇岛首秦金属材料有限公司 A kind of distribution method of heavy and medium plate mill finish rolling stage code

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CN107377629A (en) * 2017-06-28 2017-11-24 秦皇岛首秦金属材料有限公司 A kind of distribution method of heavy and medium plate mill finish rolling stage code

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ID18570A (en) 1998-04-23
KR100517714B1 (en) 2005-11-28
JPH10166003A (en) 1998-06-23
EP0839587B1 (en) 2001-12-05
DE59705654D1 (en) 2002-01-17
JP4263262B2 (en) 2009-05-13
CA2220412C (en) 2008-03-18
ES2169310T3 (en) 2002-07-01
RU2203748C2 (en) 2003-05-10
CA2220412A1 (en) 1998-05-05
TW338728B (en) 1998-08-21
US5943894A (en) 1999-08-31
DE19645497A1 (en) 1998-05-07
MY123098A (en) 2006-05-31
KR19980042089A (en) 1998-08-17
MX9708512A (en) 1998-05-31
ATE209974T1 (en) 2001-12-15

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