EP2379241A1 - Roll stand for rolling a product, in particular made of metal - Google Patents

Roll stand for rolling a product, in particular made of metal

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Publication number
EP2379241A1
EP2379241A1 EP09799260A EP09799260A EP2379241A1 EP 2379241 A1 EP2379241 A1 EP 2379241A1 EP 09799260 A EP09799260 A EP 09799260A EP 09799260 A EP09799260 A EP 09799260A EP 2379241 A1 EP2379241 A1 EP 2379241A1
Authority
EP
European Patent Office
Prior art keywords
rolls
radius
roll
rollers
roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09799260A
Other languages
German (de)
French (fr)
Other versions
EP2379241B1 (en
Inventor
Jürgen Seidel
Olaf Norman Jepsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
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SMS Siemag AG
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Filing date
Publication date
Application filed by SMS Siemag AG filed Critical SMS Siemag AG
Publication of EP2379241A1 publication Critical patent/EP2379241A1/en
Application granted granted Critical
Publication of EP2379241B1 publication Critical patent/EP2379241B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/142—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls by axially shifting the rolls, e.g. rolls with tapered ends or with a curved contour for continuously-variable crown CVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/021—Rolls for sheets or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/025—Quarto, four-high stands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/028—Sixto, six-high stands
    • 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
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/40—Control of flatness or profile during rolling of strip, sheets or plates using axial shifting of the rolls

Definitions

  • the invention relates to a roll stand for rolling a metal material, in particular, comprising a pair of first rolls contacted by a pair of second rolls supporting the first rolls, the first rolls and the second rolls having a radius profile (CVC) asymmetric with respect to a center plane -Slip), the radius profile of the first rolls being represented by a polynomial of the third or fifth order.
  • CVC radius profile
  • Such a roll stand is known from EP 1 307 302 B1.
  • a polynomial course of the type mentioned is provided as a radius profile, in order to minimize the axial forces of the roller bearings, wherein torques acting in the horizontal direction can be minimized without additional expenditure by appropriate selection of the radius profile.
  • the wedge portion of the CVC work roll contour is such that the wedging of the work roll grinding or the work roll contour is optimized to avoid rotational moments or axial forces.
  • the linear component of the polynomial (a-i) is used as an optimization parameter. This avoids cross-rolling of the rolls and minimizes the axial forces in the roll bearings.
  • EP 1 307 302 B1 The mentioned solution according to EP 1 307 302 B1 is based on a profiling of the work rolls, which interact with cylindrical support rolls. This is the optimization of the wedge of the work rolls off. Efforts are underway to extend the CVC system positioning range to further increase the tape profile setting range. In order to avoid high surface pressures between working and back-up rolls, CVC back-up rolls are also increasingly being used. However, it has turned out that In order to optimize the taper of the CVC contour of the back-up rolls, it is not possible to use the same design as for the work roll, if optimal conditions are desired.
  • the invention is therefore based on the object, a rolling stand of the type mentioned in such a way that the wedging of a first roller supporting second roller (usually, but not exclusively: the wedging of a support roller, which cooperates with a work roll) is designed so that to set optimal operating conditions.
  • RAW (X) a 0 + ai • X + a 2 • X 2 + a 3 • X 3 + a 4 • X 4 + a 5 • X 5
  • the coefficients a 4 and a 5 of the radius profile of the first rolls can be zero.
  • the course of the radius of the first rolls is represented as a third order polynomial, while the course of the radius of the second rolls is shown as a fifth order polynomial.
  • the coefficients S 4 and S 5 of the radius profile of the second rolls are zero.
  • the course of the radius of the first rolls is represented as a fifth order polynomial, while the course of the radius of the second rolls is represented as a third order polynomial.
  • the radius profile of the first rollers is designed so that the tangent, which touch an end diameter and the convex portion of the roller, and the tangent, which touch the other end diameter and the concave portion of the roller, parallel to each other and inclined with respect to the roll axes inclined by a wedge angle.
  • the first rolls are preferably work rolls and the second rolls are preferably back-up rolls.
  • the rolling mill is a Sextogerüst and the first rolls are intermediate rolls and the second rolls are backup rolls.
  • the respective linear component (wedge component), the contact length and the diameter of the corresponding adjacent roller are taken into account.
  • FIG. 1 shows schematically a rolling stand in which a rolling stock is rolled by two working rolls which are supported by two supporting rolls,
  • Fig. 2 is a perspective view of a work roll, which is supported by a support roller and
  • Fig. 3 considered the work rolls including rolling in the rolling direction.
  • the conditions are shown, which are already known from EP 1 307 302 B2, to which reference is expressly made.
  • a rolling stock 1 is to be seen in the form of a metal slab, which is rolled by two first rolls 2 in the form of work rolls.
  • the first rollers 2 are supported by second rollers 3, namely back-up rollers.
  • the work rolls 2 and the support rollers 3 have a so-called. CVC ship, d. H. with respect to a center plane 4, the profile is not symmetrical. Details on this are described in the cited EP 1 307 302 B1. Accordingly, the rollers 2, 3 over the coordinate x in the bale longitudinal direction have a functional course resulting from nth-order polynomials, with third- or fifth-order polynomials being preferred or, for the most part, sufficient.
  • the roll gap can be influenced accordingly.
  • the load between the work rolls 2 and the backup rolls 3 is unevenly distributed over the contact area b cont (see Fig. 2) and changes with the shift position of the work rolls.
  • the rule for the design of the work roll contour and the definition of the wedge component (linear coefficient of the polynomial function) are given in accordance with or very similar to the previously known EP 1 307 302 B1.
  • the coefficients a 2 , a 3 , a 4 and a 5 result from the desired setting range or effect in the roll gap.
  • the contact length between the working and support rollers or alternatively the working roller length for the design of the CVC work rolls and, in particular, for the wedge component (ai) must be used as the contact width, as described in EP 1 307 302 B1. If these rules are adhered to, the work roll contours and, in particular, the ai coefficient (wedge component) are optimally designed.
  • the wedge portion Si of the backup roll contour which can also be described by a polynomial function, similar relationships apply (which can be calculated iteratively offline).
  • the values for the wedge component si vary depending on the associated work roll contour and length.
  • the backup roll form must therefore be adapted to the work roll shape.
  • the coefficients S 2 , S 31 S 4 and S 5 (in the case of a representation of the back-up roll contour by a fifth-order polynomial) result from the desired setting range or adaptation to the work roll S shape.
  • the linear component the above-mentioned procedure for the design of the support roller contour applies here.
  • the coefficient S 3 is equal to zero.
  • the procedure can be carried out in the same way.
  • the work roll is designed analogously.
  • the design of the wedging of the intermediate roll is carried out as in the backup roll.
  • the design of the support roll of the Sexto is carried out analogously to the design of the quarto support roll.
  • the respective linear component, the contact length and the diameter of the corresponding adjacent roller are taken into account.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Metal Rolling (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

The invention relates to a roll stand for rolling a product, in particular made of metal, comprising a pair of first rollers contacted by a pair of second rollers supporting the first rollers, wherein the first roller and the second rollers have an asymmetrical radius curve (CVC grind) relative to a center plane, wherein the radius curve of the first rollers is represented by a polynomial of the third or fifth order. In order to design the wedging of a second roller supporting a first roller such that optimal operating conditions are set, the invention proposes that the radius curve of the second roller is given by a polynomial of the third or fifth order, wherein special relationships are prescribed for the ratios between the coefficients.

Description

Walzgerüst zum Walzen eines insbesondere metallischen Guts Roll stand for rolling a particular metallic Guts
Die Erfindung betrifft ein Walzgerüst zum Walzen eines insbesondere metallischen Guts, das ein Paar erster Walzen aufweist, die von einem Paar die ersten Walzen stützender zweiter Walzen kontaktiert werden, wobei die ersten Walzen sowie die zweiten Walzen mit einem bezüglich einer Mittenebene asymmetrisch ausgeführtem Radiusverlauf (CVC-Schliff) versehen sind, wobei der Radiusverlauf der ersten Walzen mit einem Polynom dritter oder fünfter Ordnung dargestellt wird.The invention relates to a roll stand for rolling a metal material, in particular, comprising a pair of first rolls contacted by a pair of second rolls supporting the first rolls, the first rolls and the second rolls having a radius profile (CVC) asymmetric with respect to a center plane -Slip), the radius profile of the first rolls being represented by a polynomial of the third or fifth order.
Ein solches Walzgerüst ist aus der EP 1 307 302 B1 bekannt. Dort wird ein Polynomverlauf der genannten Art als Radiusverlauf vorgesehen, um die Axialkräf- te der Walzenlager zu minimieren, wobei durch entsprechende Wahl des Radiusverlaufs in horizontaler Richtung wirkende Momente ohne Zusatzaufwand minimiert werden können. Von besonderer Bedeutung ist der Keilanteil der CVC-Arbeitswalzenkontur. Die Auslegung erfolgt so, dass die Keiligkeit des Arbeitswalzenschliffs bzw. der Arbeitswalzenkontur zur Vermeidung von Rotati- onsmomenten bzw. Axialkräften optimiert ist. Der lineare Anteil des Polynoms (a-i) wird hierfür als Optimierungsparameter verwendet. Dadurch kann ein Verschränken („Crossen") der Walzen vermieden und die Axialkräfte in den Walzenlagern minimiert werden.Such a roll stand is known from EP 1 307 302 B1. There, a polynomial course of the type mentioned is provided as a radius profile, in order to minimize the axial forces of the roller bearings, wherein torques acting in the horizontal direction can be minimized without additional expenditure by appropriate selection of the radius profile. Of particular importance is the wedge portion of the CVC work roll contour. The design is such that the wedging of the work roll grinding or the work roll contour is optimized to avoid rotational moments or axial forces. The linear component of the polynomial (a-i) is used as an optimization parameter. This avoids cross-rolling of the rolls and minimizes the axial forces in the roll bearings.
Die genannte Lösung gemäß der EP 1 307 302 B1 geht dabei von einer Profilierung der Arbeitswalzen aus, die mit zylindrischen Stützwalzen zusammenwirken. Hierauf stellt die Optimierung der Keiligkeit der Arbeitswalzen ab. Es bestehen Bestrebungen, den Stellbereich des CVC-Systems zu erweitern, um den Bandprofileinstellbereich weiter zu steigern. Dabei werden, um hohe Flächen- pressungen zwischen Arbeits- und Stützwalzen zu vermeiden, zunehmend auch CVC-Stützwalzen eingesetzt. Allerdings hat es sich herausgestellt, dass zur Optimierung der Keiligkeit der CVC-Kontur der Stützwalzen nicht dieselbe Auslegung wie bei der Arbeitswalze eingesetzt werden kann, wenn optimale Bedingungen angestrebt werden.The mentioned solution according to EP 1 307 302 B1 is based on a profiling of the work rolls, which interact with cylindrical support rolls. This is the optimization of the wedge of the work rolls off. Efforts are underway to extend the CVC system positioning range to further increase the tape profile setting range. In order to avoid high surface pressures between working and back-up rolls, CVC back-up rolls are also increasingly being used. However, it has turned out that In order to optimize the taper of the CVC contour of the back-up rolls, it is not possible to use the same design as for the work roll, if optimal conditions are desired.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Walzgerüst der eingangs genannten Art so fortzubilden, dass die Keiligkeit einer eine erste Walze stützenden zweiten Walze (zumeist, aber nicht ausschließlich: die Keiligkeit einer Stützwalze, die mit einer Arbeitswalze zusammenwirkt) so ausgeführt wird, dass sich optimale Betriebsbedingungen einstellen.The invention is therefore based on the object, a rolling stand of the type mentioned in such a way that the wedging of a first roller supporting second roller (usually, but not exclusively: the wedging of a support roller, which cooperates with a work roll) is designed so that to set optimal operating conditions.
Die Lösung dieser Aufgabe durch die Erfindung ist gemäß einer ersten Ausführungsform dadurch gekennzeichnet, dass bei einem Walzgerüst der eingangs genannten Art ein Radiusverlauf der ersten Walzen vorgesehen ist, der der Beziehung genügt:The solution of this problem by the invention according to a first embodiment is characterized in that in a rolling stand of the type mentioned a radius profile of the first rolls is provided, which satisfies the relationship:
RAW(X) = a0 + ai • X + a2 • X + a3 RAW (X) = a 0 + ai • X + a 2 • X + a 3
mit: RAW (X): Radiusverlauf der ersten Walze x: Koordinate in Ballen-Längsrichtung mit dem Ursprung (x = 0) in Ballenmitte ao: aktueller Radius der ersten Walze ai: Optimierungsparameter (Keilfaktor) a2 ,az. Koeffizienten (Stellbereich des CVC-Systems)with: RAW (X): radius of the first roll x: coordinate in the longitudinal direction of the bale with the origin (x = 0) in the middle of the bale ao: current radius of the first roll ai: optimization parameter (wedge factor) a 2 , az. Coefficients (setting range of the CVC system)
Hierbei ist für den Radiusverlauf der zweiten Walzen die Funktion vorgesehen:Here, the function is provided for the radius profile of the second rolls:
Rsw(x) = S0 + Si • x + S2 • x2 + S3 • x3 Rsw (x) = S 0 + Si • x + S 2 • x 2 + S 3 • x 3
mit: Rsw(x): Radiusverlauf der zweiten Walze x: Koordinate in Ballen-Längsrichtung mit dem Ursprung (x = 0) in Ballenmittewith: Rsw (x): Radius of the second roll x: Coordinate in bale longitudinal direction with the origin (x = 0) in the center of the bale
SQ: aktueller Radius der zweiten Walze Si: Optimierungsparameter (Keilfaktor) s2lS3: Koeffizienten (Stellbereich des CVC-Systems)SQ: current radius of the second roller Si: optimization parameter (wedge factor) s 2l S 3 : coefficients (setting range of the CVC system)
wobei folgende Beziehung zwischen den genannten Größen besteht:the following relationship exists between the mentioned quantities:
Si = fi • [RSW/RAW • (b contAW — b contSw) • 83 + b contSW * S3]Si = fi • [RSW / RAW • (b contAW -b contSw) • 83 + b contSW * S3]
mit: bcontAw: Kontaktlänge der beiden ersten Walzen bcontsw: Kontaktlänge zwischen erster und zweiter Walze oder Länge der zweiten Walze ft = -1/20 bis -6/20with: bcont A w: contact length of the first two rolls bcontsw: contact length between the first and second rolls or length of the second roll ft = -1/20 to -6/20
Zwischen den Koeffizienten des Radiusverlaufs der ersten Walzen gilt vorzugsweise:Between the coefficients of the radius profile of the first rolls preferably applies:
ai = fi • a3 • b2 contAwai = fi • a 3 • b 2 cont Aw
mit: f, = -1/20 bis -6/20with: f, = -1/20 to -6/20
Eine alternative Lösung sieht bei einem Walzgerüst der eingangs genannten Art ein Radiusverlauf der ersten Walzen vor, der der Beziehung genügt:An alternative solution provides for a rolling mill of the type mentioned a radius profile of the first rolls, which satisfies the relationship:
RAW(X) = a0 + ai • X + a2 • X2 + a3 • X3 + a4 • X4 + a5 • X5 RAW (X) = a 0 + ai • X + a 2 • X 2 + a 3 • X 3 + a 4 • X 4 + a 5 • X 5
mit: RAW (X): Radiusverlauf der ersten Walze x: Koordinate in Ballen-Längsrichtung ao: aktueller Radius der ersten Walze a^ Optimierungsparameter (Keilfaktor) a2 bis a5: Koeffizienten (Stellbereich des CVC-Systems)with: RAW (X): radius of the first roll x: coordinate in the direction of the bale ao: current radius of the first roll a ^ optimization parameter (wedge factor) a 2 to a 5 : coefficients (setting range of the CVC system)
Hierbei ist für den Radiusverlauf der zweiten Walzen die Funktion vorgesehen: Rsw(x) = S0 + Si • x + S2 x2 + s3 X3 + S4 - X + S5 Here, the function is provided for the radius profile of the second rolls: Rsw (x) = S 0 + Si • x + S 2 x 2 + s 3 X 3 + S 4 - X + S 5
mit: Rsw(x): Radiusverlauf der zweiten Walze x: Koordinate in Ballen-Längsrichtungwith: Rsw (x): radius profile of the second roller x: coordinate in the longitudinal direction of the bale
S0: aktueller Radius der zweiten Walze Si: Optimierungsparameter (Keilfaktor)S 0 : current radius of the second roll Si: optimization parameter (wedge factor)
S2 bis S5: Koeffizienten (Stellbereich des CVC-Systems)S 2 to S 5 : coefficients (setting range of the CVC system)
wobei folgende Beziehung zwischen den genannten Größen besteht:the following relationship exists between the mentioned quantities:
S-I = f| • [RSW/RAW ' (b contAW — b contSw) • &3 + b contSW " S3] + f2 • [RSW/RAW * (b contAW — b contSw) • a5 + b contSW • S5]SI = f | • [RSW / RAW '(b contAW - b contSw) • & 3 + b contSW "S3] + f2 • [RSW / RAW * (b contAW -b contSw) • a 5 + b contSW • S 5 ]
mit: bcontAw: Kontaktlänge der beiden ersten Walzen bcontsw: Kontaktlänge zwischen erster und zweiter Walze oder Länge der zweiten Walze fi = -1/20 bis -6/20 f 2 = 0 bis -9/112with: bcont A w: contact length of the first two rolls bcontsw: contact length between first and second rolls or length of the second roll fi = -1/20 to -6/20 f 2 = 0 to -9/112
In diesem Falle gilt zwischen den Koeffizienten des Radiusverlaufs der ersten Walzen vorzugsweise:In this case, between the coefficients of the radius profile of the first rolls preferably applies:
ai = f| • a$ • b contAW + f2 • a5 • b contAWai = f | • a $ b • contAW + f2 • a 5 • b contAW
mit: f, = -1/20 bis -6/20 f 2 = 0 bis -9/112with: f, = -1/20 to -6/20 f 2 = 0 to -9/112
Die Koeffizienten a4 und a5 des Radiusverlaufs der ersten Walzen können dabei Null sein. In diesem Falle wird also der Verlauf des Radius der ersten Walzen als Polynom dritter Ordnung dargestellt, während der Verlauf des Radius der zweiten Walzen als Polynom fünfter Ordnung dargestellt ist. Umgekehrt ist es auch möglich, dass die Koeffizienten S4 und S5 des Radiusverlaufs der zweiten Walzen Null sind. Dann wird der Verlauf des Radius der ersten Walzen als Polynom fünfter Ordnung dargestellt, während der Verlauf des Radius der zweiten Walzen als Polynom dritter Ordnung dargestellt ist.The coefficients a 4 and a 5 of the radius profile of the first rolls can be zero. In this case, therefore, the course of the radius of the first rolls is represented as a third order polynomial, while the course of the radius of the second rolls is shown as a fifth order polynomial. Conversely, it is also possible that the coefficients S 4 and S 5 of the radius profile of the second rolls are zero. Then, the course of the radius of the first rolls is represented as a fifth order polynomial, while the course of the radius of the second rolls is represented as a third order polynomial.
Wie als solches vorbekannt, ist bevorzugt vorgesehen, dass der Radiusverlauf der ersten Walzen so ausgebildet ist, dass die Tangente, die einen Enddurchmesser und die konvexe Partie der Walze berühren, und die Tangente, die den anderen Enddurchmesser und die konkave Partie der Walze berühren, zueinander parallel und gegenüber den Walzenachsen um einen Keilwinkel geneigt verlaufen. Analoges gilt für den Radiusverlauf Rsw (x) der zweiten Walze.As previously known as such, it is preferably provided that the radius profile of the first rollers is designed so that the tangent, which touch an end diameter and the convex portion of the roller, and the tangent, which touch the other end diameter and the concave portion of the roller, parallel to each other and inclined with respect to the roll axes inclined by a wedge angle. The same applies to the radius profile Rsw (x) of the second roller.
Die ersten Walzen sind bevorzugt Arbeitswalzen und die zweiten Walzen sind bevorzugt Stützwalzen.The first rolls are preferably work rolls and the second rolls are preferably back-up rolls.
Es ist aber auch möglich, dass das Walzgerüst ein Sextogerüst ist und die ersten Walzen Zwischenwalzen sind und die zweiten Walzen Stützwalzen sind.But it is also possible that the rolling mill is a Sextogerüst and the first rolls are intermediate rolls and the second rolls are backup rolls.
Generell gilt, dass der jeweilige Linearanteil (Keilanteil), die Kontaktlänge und der Durchmesser der entsprechenden Nachbarwalze berücksichtigt werden.In general, the respective linear component (wedge component), the contact length and the diameter of the corresponding adjacent roller are taken into account.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Es zeigen:In the drawing, an embodiment of the invention is shown. Show it:
Fig. 1 schematisch ein Walzgerüst, in dem ein Walzgut von Zwei Arbeits- walzen gewalzt werden, die von zwei Stützwalzen abgestützt werden,1 shows schematically a rolling stand in which a rolling stock is rolled by two working rolls which are supported by two supporting rolls,
Fig. 2 in perspektivischer Ansicht eine Arbeitswalze, die von einer Stützwalze gestützt wird undFig. 2 is a perspective view of a work roll, which is supported by a support roller and
Fig. 3 die Arbeitswalzen samt Walzgut in Walzrichtung betrachtet. In den Figuren sind die Verhältnisse dargestellt, die bereits aus der EP 1 307 302 B2 bekannt sind, auf die insoweit ausdrücklich Bezug genommen wird. In Fig. 1 ist ein Walzgut 1 in Form einer Metallbramme zu sehen, die von zwei ersten Walzen 2 in Form von Arbeitswalzen gewalzt wird. Die ersten Walzen 2 werden von zweiten Walzen 3, nämlich von Stützwalzen, abgestützt.Fig. 3 considered the work rolls including rolling in the rolling direction. In the figures, the conditions are shown, which are already known from EP 1 307 302 B2, to which reference is expressly made. In Fig. 1, a rolling stock 1 is to be seen in the form of a metal slab, which is rolled by two first rolls 2 in the form of work rolls. The first rollers 2 are supported by second rollers 3, namely back-up rollers.
Die Arbeitswalzen 2 und auch die Stützwalzen 3 weisen einen sog. CVC-Schiff auf, d. h. bezüglich einer Mittenebene 4 ist das Profil nicht symmetrisch. Details hierzu sind in der genannten EP 1 307 302 B1 beschrieben. Demgemäß haben die Walzen 2, 3 über der Koordinate x in Ballen-Längsrichtung einen funktionalen Verlauf, der sich aus Polynomen n-ter Ordnung ergeben, wobei Polynome dritter oder fünfter Ordnung bevorzugt sind bzw. zumeist ausreichen.The work rolls 2 and the support rollers 3 have a so-called. CVC ship, d. H. with respect to a center plane 4, the profile is not symmetrical. Details on this are described in the cited EP 1 307 302 B1. Accordingly, the rollers 2, 3 over the coordinate x in the bale longitudinal direction have a functional course resulting from nth-order polynomials, with third- or fifth-order polynomials being preferred or, for the most part, sufficient.
Werden die Arbeitswalzen 2 relativ zueinander axial verschoben, kann der Walzspalt entsprechend beeinflusst werden. Die Last zwischen den Arbeitswalzen 2 und den Stützwalzen 3 ist über den Kontaktbereich bcont (s. Fig. 2) ungleich verteilt und ändert sich mit der Verschiebeposition der Arbeitswalzen.If the work rolls 2 are displaced axially relative to one another, the roll gap can be influenced accordingly. The load between the work rolls 2 and the backup rolls 3 is unevenly distributed over the contact area b cont (see Fig. 2) and changes with the shift position of the work rolls.
Die sich aus den Walzenformen ergebenen Lasten und die lokale positive oder negative Relativgeschwindigkeit führen - wie es in Fig. 2 illustriert ist - zu unterschiedlichen Umfangskräften Qj über der Kontaktbreite bCOnt- Die Verteilung der Walzenumfangskraft Qj erzeugt ein Moment M um die Mitte des Walzge- rüsts, was zum Schränken („Crossen") der Walzen und damit zu Axialkräften in den Walzenlagern führen kann. Dies kann vermieden werden, indem den WaI- zen ein entsprechender Schliff verliehen wird. Vorliegend erfolgt dies mit einem Radiusverlauf, der als Polynom dritter oder fünfter Ordnung vorgegeben ist.The loads resulting from the roll forms and the local positive or negative relative velocity lead - as illustrated in FIG. 2 - to different circumferential forces Qj over the contact width b CO n t - The distribution of the roll circumferential force Qj generates a moment M around the center of the This can be avoided by giving the shears a suitable finish, in the present case with a radius profile, called a polynomial third or fifth order is given.
Aus der EP 1 307 302 B2 ist es bekannt, den sog. Keilfakor, d. h. der Koeffizient vor dem linearen Polynomanteil, zu optimieren, wofür entsprechende Be- Ziehungen vorgeschlagen werden. Wie in Fig. 3 gesehen werden kann, ist vorgesehen, dass der Radiusverlauf der Arbeitswalzen 2 so ausgebildet ist, dass die Tangente 5, die einen Enddurchmesser 6 und die konvexe Partie der Arbeitswalze 2 berühren, und die Tangente 7, die den anderen Enddurchmesser 8 und die konkave Partie der Walze 2 berühren, zueinander parallel und gegenüber den Walzenachsen um einen Keilwinkel α geneigt verlaufen. Analoges gilt für den Radusverlauf der Stützwalzen 3.From EP 1 307 302 B2 it is known to optimize the so-called wedge factor, ie the coefficient before the linear polynomial part, for which corresponding drawings are proposed. As can be seen in Fig. 3, it is provided that the radius profile of the work rolls 2 is formed so that the tangent 5, the one end diameter 6 and the convex portion of the work roll 2 touch, and the tangent 7, the other end diameter. 8 and the concave portion of the roller 2, parallel to one another and inclined with respect to the roller axes by a wedge angle α. The same applies to the Radusverlauf the support rollers. 3
Demgemäß kann das vorliegende Konzept nochmals so zusammengefasst werden:Accordingly, the present concept can be summarized again as follows:
Die Regel für die Auslegung der Arbeitswalzenkontur und die Festlegung des Keilanteils (linearer Koeffizient der Polynomfunktion) ergeben sich gemäß oder sehr ähnlich der bereits vorbekannten EP 1 307 302 B1. Die Koeffizienten a2, a3, a4 und a5 (im Falle eines Polynoms fünfter Ordnung) ergeben sich aus dem gewünschten Stellbereich oder Effekt im Walzspalt. Als Kontaktbreite ist die Kontaktlänge zwischen Arbeits- und Stützwalze oder alternativ die Arbeitswalzenlänge für die Auslegung der CVC-Arbeitswalzen und namentlich für den Keilanteil (a-i) anzusetzen, wie in der EP 1 307 302 B1 beschrieben. Werden diese Regeln eingehalten, sind die Arbeitswalzenkonturen und insbesondere der ai-Koeffizient (Keilanteil) optimal ausgelegt.The rule for the design of the work roll contour and the definition of the wedge component (linear coefficient of the polynomial function) are given in accordance with or very similar to the previously known EP 1 307 302 B1. The coefficients a 2 , a 3 , a 4 and a 5 (in the case of a fifth-order polynomial) result from the desired setting range or effect in the roll gap. The contact length between the working and support rollers or alternatively the working roller length for the design of the CVC work rolls and, in particular, for the wedge component (ai) must be used as the contact width, as described in EP 1 307 302 B1. If these rules are adhered to, the work roll contours and, in particular, the ai coefficient (wedge component) are optimally designed.
Für den Keilanteil Si der Stützwalzenkontur, die ebenfalls durch eine Polynomfunktion beschrieben werden kann, gelten ähnliche Beziehungen (die iterativ offline errechnet werden können). Die Werte für den Keilanteil si variieren ab- hängig von der dazugehörigen Arbeitswalzenkontur und -länge. Die Stützwalzenform muss also an die Arbeitswalzenform angepasst werden. Die Koeffizienten S2, s3l S4 und S5 (im Falle einer Darstellung der Stützwalzenkontur durch ein Polynom fünfter Ordnung) ergeben sich aus dem gewünschten Stellbereich bzw. der Anpassung an die Arbeitswalzen-S-Form. Für den Linearanteil gilt hier die oben genannte Vorgehensweise für die Auslegung der Stützwalzenkontur. Für den Sonderfall, dass - bei einer Darstellung des Radiusverlaufs als Polynom dritter Ordnung - die Stützwalze keine CVC-Kontur aufweist, ist der Koeffizient S3 gleich Null.For the wedge portion Si of the backup roll contour, which can also be described by a polynomial function, similar relationships apply (which can be calculated iteratively offline). The values for the wedge component si vary depending on the associated work roll contour and length. The backup roll form must therefore be adapted to the work roll shape. The coefficients S 2 , S 31 S 4 and S 5 (in the case of a representation of the back-up roll contour by a fifth-order polynomial) result from the desired setting range or adaptation to the work roll S shape. For the linear component, the above-mentioned procedure for the design of the support roller contour applies here. For the special case that - in a representation of the radius profile as a third order polynomial - the backup roller has no CVC contour, the coefficient S 3 is equal to zero.
Die oben genannten Beziehungen gelten auch für Konturen, die einer S- förmigen Kontur ähnlich sind, z. B. für eine sog. „SmartCrown"-Funktion (Sinusfunktion) oder für Konturen, die durch eine Punktfolge vorgegeben werden und mit einer der oben genannten Polynomfunktionen approximierbar sind.The above relationships also apply to contours similar to an S-shaped contour, e.g. B. for a so-called. "SmartCrown" function (sine function) or for contours that are specified by a point sequence and are approximated with one of the above polynomial functions.
Bei einem Sexto-Gerüst kann die Vorgehensweise in gleichere Weise durchgeführt werden. Hier wird analog die Arbeitswalze ausgelegt. Die Auslegung der Keiligkeit der Zwischenwalze erfolgt wie bei der Stützwalze. Nachdem die Zwischenwalze festliegt, führt man die Auslegung der Stützwalze des Sextos analog zur Auslegung der Stützwalze des Quartos durch. Allgemein ausgedrückt, werden dabei der jeweilige Linearanteil, die Kontaktlänge und der Durchmesser der entsprechenden Nachbarwalze berücksichtigt.For a sexto framework, the procedure can be carried out in the same way. Here, the work roll is designed analogously. The design of the wedging of the intermediate roll is carried out as in the backup roll. After the intermediate roll has been fixed, the design of the support roll of the Sexto is carried out analogously to the design of the quarto support roll. Generally speaking, the respective linear component, the contact length and the diameter of the corresponding adjacent roller are taken into account.
Im Sonderfall kann z. B. die Arbeitswalzenkontur durch eine Polynomfunktion fünfter Ordnung und die Stützwalze oder Zwischenwalze durch eine Polynom- funktion dritter Ordnung oder umgekehrt ausgeführt sein. Hier gelten für die Arbeitswalzen die obigen Gesetzmäßigkeiten. Für die Stütz- und Zwischenwalzenkonturen werden die Keiligkeiten ebenfalls nach obiger Vorgehensweise optimiert.In a special case z. B. the work roll contour by a polynomial function of the fifth order and the back-up roll or intermediate roll by a polynomial function of the third order or vice versa be executed. Here, the above laws apply to the work rolls. For the support and intermediate roll contours, the wedges are also optimized according to the above procedure.
Die obigen Ausführungen gelten einmal für die Approximation des Radiusprofils durch ein Polynom dritter Ordnung und einmal für ein Polynom fünfter Ordnung. Grundsätzlich ist es aber natürlich auch möglich, Polynome noch höherer Ordnung vorzusehen. Zumeist werden indes selten Polynome höherer Ordnung als fünf angewendet. Bezugszeichenliste:The above statements apply once to the approximation of the radius profile by a third order polynomial and once to a fifth order polynomial. In principle, however, it is also possible to provide polynomials of even higher order. In most cases, polynomials of higher order than five are rarely used. LIST OF REFERENCE NUMBERS
1 Walzgut1 rolling stock
2 erste Walze (Arbeitswalze)2 first roller (work roll)
3 zweite Walze (Stützwalze)3 second roller (back-up roller)
4 Mittenebene4 middle level
5 Tangente5 tangents
6 Enddurchmesser6 final diameter
7 Tangente7 tangent
8 Enddurchmesser8 final diameter
α Keilwinkel α wedge angle

Claims

Patentansprüche: claims:
1. Walzgerüst zum Walzen eines insbesondere metallischen Guts (1), das ein Paar erster Walzen (2) aufweist, die von einem Paar die ersten Walzen stützender zweiter Walzen (3) kontaktiert werden, wobei die ersten Walzen (2) sowie die zweiten Walzen (3) mit einem bezüglich einer Mittenebene (4) asymmetrisch ausgeführtem Radiusverlauf (CVC-Schliff) versehen sind, wobei der Radiusverlauf der ersten Walzen (2) der Beziehung genügt:A rolling stand for rolling a metallic material in particular (1) having a pair of first rolls (2) contacted by a pair of first rolls supporting second rolls (3), said first rolls (2) and said second rolls (3) are provided with a radius of curvature (CVC) which is asymmetrical relative to a center plane (4), the radius profile of the first rollers (2) satisfying the relationship:
RAW(X) = a0 + ai • x + a2 • x2 + a3 • x3 RAW (X) = a 0 + ai • x + a 2 • x 2 + a 3 • x 3
mit: RAw (X): Radiusverlauf der ersten Walze x: Koordinate in Ballen-Längsrichtung mit dem Ursprung (x = 0) in Ballenmitte ao: aktueller Radius der ersten Walze a-i: Optimierungsparameter (Keilfaktor) a2 ,a3: Koeffizienten (Stellbereich des CVC-Systems)with: R A w (X): radius of the first roll x: coordinate in the longitudinal direction of the bale with the origin (x = 0) in the middle of the bale ao: current radius of the first roll ai: optimization parameter (wedge factor) a 2 , a 3 : coefficients (Adjustment range of the CVC system)
dadurch gekennzeichnet, dasscharacterized in that
der Radiusverlauf der zweiten Walzen (3) der Beziehung genügt:the radius course of the second rolls (3) satisfies the relationship:
Rsw(x) = S0 + Si • x + S2 x2 + s3 Rsw (x) = S 0 + Si • x + S 2 x 2 + s 3
mit: Rsw(x): Radiusverlauf der zweiten Walze x: Koordinate in Ballen-Längsrichtung mit dem Ursprung (x = 0) in Ballenmitte So: aktueller Radius der zweiten Walzewith: Rsw (x): Radius of the second roll x: Coordinate in bale length direction with the origin (x = 0) in the center of the bale So: current radius of the second roll
Si: Optimierungsparameter (Keilfaktor) S2,s3: Koeffizienten (Stellbereich des CVC-Systems)Si: optimization parameter (wedge factor) S 2 , s 3 : coefficients (setting range of the CVC system)
wobei folgende Beziehung zwischen den genannten Größen besteht:the following relationship exists between the mentioned quantities:
Si = f| • [RSW/RAW ' (b contAW — b contsw) • 83 + b contSW ' S3]Si = f | • [RSW / RAW '(b contAW -b contsw) • 83 + b contSW' S3]
mit: bcontAw: Kontaktlänge der beiden ersten Walzen bcontsw: Kontaktlänge zwischen erster und zweiter Walze oder Länge der zweiten Walze fi = -1/20 bis -6/20with: bcont A w: contact length of the first two rolls bcontsw: contact length between the first and second rolls or length of the second roll fi = -1/20 to -6/20
2. Walzgerüst nach Anspruch 1 , dadurch gekennzeichnet, dass zwischen den Koeffizienten des Radiusverlaufs der ersten Walzen (2) gilt:2. Roll stand according to claim 1, characterized in that between the coefficients of the radius profile of the first rolls (2):
ai = fi • a3 • b contAW ai = fi • a3 • b contAW
3. Walzgerüst zum Walzen eines insbesondere metallischen Guts (1), das ein Paar erster Walzen (2) aufweist, die von einem Paar die ersten Walzen stützender zweiter Walzen (3) kontaktiert werden, wobei die ersten WaI- zen (2) sowie die zweiten Walzen (3) mit einem bezüglich einer Mittenebene (4) asymmetrisch ausgeführtem Radiusverlauf (CVC-Schliff) versehen sind, wobei der Radiusverlauf der ersten Walzen (2) der Beziehung genügt:3. Roll stand for rolling a particular metallic Guts (1) having a pair of first rollers (2) which are contacted by a pair of first rollers supporting the second rollers (3), wherein the first Wai zen (2) and the second rollers (3) are provided with a center plane (4) asymmetric radii (CVC), wherein the radius of the first roller (2) satisfies the relationship:
RAW(X) = ao + a-i • x + a2 x2 + a3 • x3 + a4 • x4 + a5 mit: RAW (X): Radiusverlauf der ersten Walze x: Koordinate in Ballen-Längsrichtung a0: aktueller Radius der ersten Walze a-i: Optimierungsparameter (Keilfaktor) a2 bis a5: Koeffizienten (Stellbereich des CVC-Systems)RAW (X) = ao + ai • x + a 2 x 2 + a 3 • x 3 + a 4 • x 4 + a 5 with: R A W (X): radius profile of the first roller x: coordinate in the longitudinal direction of the bale a 0 : current radius of the first roller ai: optimization parameter (wedge factor) a 2 to a 5 : coefficients (positioning range of the CVC system)
dadurch gekennzeichnet, dasscharacterized in that
der Radiusverlauf der zweiten Walzen (3) der Beziehung genügt:the radius course of the second rolls (3) satisfies the relationship:
Rsw(x) = S0 + Si • x + S2 • x2 + S3 • x3 + S4 • x4 + S5 • x5 Rsw (x) = S 0 + Si • x + S 2 • x 2 + S 3 • x 3 + S 4 • x 4 + S 5 • x 5
mit: Rsw(x): Radiusverlauf der zweiten Walze x: Koordinate in Ballen-Längsrichtung so: aktueller Radius der zweiten Walze s-f. Optimierungsparameter (Keilfaktor)with: Rsw (x): radius profile of the second roller x: coordinate in the longitudinal direction of the bale so: current radius of the second roller s-f. Optimization parameter (wedge factor)
S2 bis S5: Koeffizienten (Stellbereich des CVC-Systems)S 2 to S 5 : coefficients (setting range of the CVC system)
wobei folgende Beziehung zwischen den genannten Größen besteht:the following relationship exists between the mentioned quantities:
S-I = f-i • [RSW/RAW • (b contAW — b contSw) • 83 + b contSW * S3] + f2 • [RSW/RAW ■ (b contAW — b contSw) • a5 + b contSW ' S5]SI = fi • [RSW / RAW • (b contAW -b contSw) • 83 + b contSW * S3] + f 2 • [RSW / RAW ■ (b contAW -b contSw) • a 5 + b contSW 'S 5 ]
mit: bcoπtAw'. Kontaktlänge der beiden ersten Walzen bcontsw: Kontaktlänge zwischen erster und zweiter Walze oder Länge der zweiten Walze fι = -1/20 bis -6/20 f 2 = 0 bis -9/1 12 with: bcoπt A w '. Contact length of the first two rolls bcontsw: contact length between the first and second rolls or length of the second roll fι = -1/20 to -6/20 f 2 = 0 to -9/1 12
4. Walzgerüst nach Anspruch 3, dadurch gekennzeichnet, dass zwischen den Koeffizienten des Radiusverlaufs der ersten Walzen (2) gilt:4. Roll stand according to claim 3, characterized in that between the coefficients of the radius profile of the first rolls (2):
ai = fι • a3 • b contAw + h • a5 • b' contAWai = fi • a 3 • b contAw + h • a 5 • b 'contAW
mit: fi = -1/20 bis -6/20 f 2 = 0 bis -9/112with: fi = -1/20 to -6/20 f 2 = 0 to -9/112
5. Walzgerüst nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Koeffizienten a4 und a5 des Radiusverlaufs der ersten Walzen (2) Null sind.5. Roll stand according to claim 3 or 4, characterized in that the coefficients a 4 and a 5 of the radius profile of the first rollers (2) are zero.
6. Walzgerüst nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Koeffizienten S4 und S5 des Radiusverlaufs der zweiten Walzen (2) Null sind.6. rolling stand according to claim 3 or 4, characterized in that the coefficients S 4 and S 5 of the radius profile of the second rollers (2) are zero.
7. Walzgerüst nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Radiusverlauf RAW(X) der ersten Walzen (2) und/oder der Radiusverlauf Rsw (x) der zweiten Walzen (3) so ausgebildet ist, dass die Tan- gente (5), die einen Enddurchmesser (6) und die konvexe Partie der Walze (2) berühren, und die Tangente (7), die den anderen Enddurchmesser (8) und die konkave Partie der Walze (2) berühren, zueinander parallel und gegenüber den Walzenachsen um einen Keilwinkel (α) geneigt verlaufen. 7. rolling stand according to one of claims 1 to 6, characterized in that the radius profile RAW (X) of the first rollers (2) and / or the radius profile Rsw (x) of the second rollers (3) is formed so that the Tan gents (5) contacting one end diameter (6) and the convex portion of the roller (2), and the tangent (7) contacting the other end diameter (8) and the concave portion of the roller (2) are parallel to each other and run inclined relative to the roll axes by a wedge angle (α).
8. Walzgerüst nach Anspruch 1 oder 3, dadurch gekennzeichnet, dass die ersten Walzen Arbeitswalzen (2) sind und die zweiten Walzen Stützwalzen (3) sind.8. Roll stand according to claim 1 or 3, characterized in that the first rolls are work rolls (2) and the second rolls are backup rolls (3).
9. Walzgerüst nach Anspruch 1 oder 3, dadurch gekennzeichnet, dass das Walzgerüst ein Sextogerüst ist und die ersten Walzen Zwischenwalzen sind und die zweiten Walzen Stützwalzen sind.9. rolling stand according to claim 1 or 3, characterized in that the rolling mill is a Sextogerüst and the first rolls are intermediate rolls and the second rolls are backup rolls.
10. Walzgerüst nach Anspruch 1 - 9 bestehend aus mehreren Walzen, da- durch gekennzeichnet, dass allgemein der jeweilige Linearanteil, die Kontaktlänge und der Durchmesser der entsprechenden Nachbarwalze bei der Bestimmung der Koeffizienten berücksichtigt ist. 10. Roll stand according to claim 1 - 9 consisting of a plurality of rollers, character- ized in that in general the respective linear component, the contact length and the diameter of the corresponding adjacent roller is taken into account in the determination of the coefficients.
EP09799260.6A 2008-12-17 2009-12-15 Roll stand for rolling a product, in particular made of metal Active EP2379241B1 (en)

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