EP2067542A1 - Method and rolling mill to produce wireless steel pipes - Google Patents

Method and rolling mill to produce wireless steel pipes Download PDF

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Publication number
EP2067542A1
EP2067542A1 EP08020693A EP08020693A EP2067542A1 EP 2067542 A1 EP2067542 A1 EP 2067542A1 EP 08020693 A EP08020693 A EP 08020693A EP 08020693 A EP08020693 A EP 08020693A EP 2067542 A1 EP2067542 A1 EP 2067542A1
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EP
European Patent Office
Prior art keywords
mandrel
rolling
rolling mill
piercer
adapter
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
EP08020693A
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German (de)
French (fr)
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EP2067542B1 (en
Inventor
Hans Joachim Pehle
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SMS Group GmbH
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SMS Meer GmbH
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Publication date
Priority claimed from DE102008056988A external-priority patent/DE102008056988A1/en
Application filed by SMS Meer GmbH filed Critical SMS Meer GmbH
Publication of EP2067542A1 publication Critical patent/EP2067542A1/en
Application granted granted Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
    • B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/08—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills
    • B21B17/10—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills in a continuous process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • B21B19/06—Rolling hollow basic material, e.g. Assel mills

Definitions

  • the invention relates to a method and a rolling mill for producing seamless steel tubes in a continuous rolling process with one or more consecutively arranged longitudinal or Schrägwalzgerüsten and an inner tool used in the rolling process inside the rolling tool, designed as a mandrel with a perforated mandrel arranged on this front.
  • the hollow block with the mandrel threaded therewith mandrel rod as an internal tool as in a variant, for example, by the DE 21 31 713 A1 have become known from an inlet side Dornstangenhalte- or traversing, usually called retainer, driven into position and then pushed into the Kontiwalzwerk.
  • the hollow block is detected by the rollers and rolled out by the skeleton from frame to frame becoming smaller rolling caliber on the mandrel.
  • the mandrel bar with the piercer also assumes an ever-increasing speed.
  • the mandrel bar is retracted by means of the mandrel bar holding and traversing device with controlled, semi or fully controlled mandrel bar speed during rolling.
  • a problem known both in oblique rolling for punching blocks into hollow blocks and in rolling the hollow block into a billet in a multistage continuous rolling mill is that mandrels which are made of round solid material or of round hollow material undergo deformations due to the partially considerable forces.
  • the resulting deflection of the mandrel rod leads to increased eccentricity with wobbling movements of the mandrel mounted on the mandrel. It also moves the mandrel at the axial end of the mandrel eccentric to the longitudinal axis.
  • the invention is therefore based on the object to provide a method and a rolling mill, with which the said disadvantages, in particular eccentricities perforated hollow blocks or beads, reliably avoid or at least reduce to a technically feasible level.
  • This object is achieved by a method according to the invention in that the piercer is imposed on the rolling material rotational movement opposite rotational movement.
  • the invention is based on the finding that by rotation of the mandrel against the rotational movement of the rolling stock, in a preferred embodiment, an opposite eccentric rotational movement of the piercer, the mechanism of eccentricity is prevented.
  • the result is a significant improvement in the quality of seamless tube production with corresponding cost savings for rolling mill operators. Because the eccentricity otherwise beneficial, negative influences from rolling mill operation with rolling of tubes on mandrel bars can be eliminated in this way.
  • the object underlying the invention is achieved with a rolling mill according to the invention in that the mandrel rod during a rolling process opposite to the rolling stock rotation rotating drive device is assigned, for example, as a further component of the inlet side Dornstangenhalte- or traversing.
  • a preferred proposal of the invention provides for this purpose that the mandrel bar is connected via an adapter eccentrically with the piercer.
  • the rotation of the mandrel bar which is opposite to that of the rolling-material rotation, thus takes place at the location of the event where the billet is advanced in advance between the rolls on the piercer, as an eccentrically opposite rotation.
  • the adapter is screwed to the mandrel and the mandrel, wherein the mandrel and the mandrel facing each other, have a degree of eccentricity staggered threaded heads.
  • This can be achieved in a simple manner in that the longitudinal axes or center lines on the one hand of the mandrel rod thread head and on the other hand of the piercer thread head are slightly offset in height from one another, e.g. several tenths of a millimeter or several millimeters.
  • the threaded heads are provided with external thread and terminal ends of the adapter with internal thread.
  • the adapter thus only needs to be screwed onto the mandrel rod and the much shorter mandrel in contrast only in the other, free terminal end of the adapter.
  • the measure of eccentricity can alternatively also be formed in the terminal ends of the adapter, i. the internal threads in the female or pot-like terminal ends have an offset from each other.
  • the mandrel bar is designed with a cross-sectional profile which increases the axial moment of resistance, the elimination of variables influencing the eccentricity can be promoted. Because by choosing the cross-sectional profile, the increased resistance moment contribute to the fact that deflections of the mandrel and thus wobbling movements of the piercer can counteract with the adverse eccentricities.
  • an internally cooled tubular mandrel rod it can be advantageously formed with an internal profiling, e.g. a cross profile or an internal hexagon profile.
  • an internal profiling e.g. a cross profile or an internal hexagon profile.
  • Fig. 1 schematically shown, the rolling stock or a tube blank 1 on a introduced into the interior of the tube blank 1 internal tool 2 between rollers 3, 4 rolled.
  • the inner tool 2 which consists of a mandrel 2a and arranged at the front end Piercing mandrel 2b is, has a round cross-section, to which the outer periphery of the tube blank 1 rolling rollers 3, 4 are formed with a corresponding contour, ie they are circular arc in radial section.
  • rollers 3, 4 thus results in a nip, which defines the desired circular shape, which assumes the tube blank 1 during rolling to the tube.
  • Fig. 1 ideal annular cross-section with desired roundness and uniform wall thickness d of the tube blank 1 or of the produced seamless tube is achieved that the inner tool 2, ie the mandrel 2b with the mandrel 2a by means of a drive means 5 imposed by an arrow 7 rotation is imposed, the opposite to the indicated by arrow 6, during rolling unavoidable Walzgutfitzi the tube blank 1 and der Rohres ist.
  • the piercer When the indoor tool 2, as in Fig. 2 shown formed with a at the axial front end of the mandrel 2a eccentrically arranged piercer 2b, the piercer performs a Walzgutfitterrorism 6 opposite eccentric rotational movement 7a.
  • the mandrel 2a is for this purpose connected via an adapter 8 with the piercer 2b, and screwed, with the mandrel 2a and the piercer 2b facing each other, an eccentricity 9 offset from each other threaded heads 10a and 10b have.
  • the center line or longitudinal axis 11a of the mandrel rod 2a thus extends around the eccentric 9 offset from the center line or longitudinal axis 11b of the piercer 2b.
  • the cylindrical cross-section adapter 8 has pot-like connection ends 12a and 12b, which are formed with an internal thread and are screwed onto external threads of the threaded heads 10a, 10b; the connection thread connections 13a, 13b are indicated by arrows.
  • the mandrel of the inner tool can be formed with an axial moment of resistance increasing cross-sectional profile. This can be a deflection-preventing or largely reducing coat or external profiling of a solid material mandrel.
  • tubular mandrel rods 102a and 102b are formed with an inner profiling 14, according to Fig. 3 as cross profile 14a and after Fig. 4 as inner hexagon profile 14b.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)

Abstract

The method involves forming an inner tool (2) as a mandrel bar (2a) with a piercer (2b) arranged on the bar in a front side, where the inner tool is provided in an interior of a pipe blank (1). A rotation movement (7) opposite to a rotary movement (6) of the pipe blank is imposed to the piercer. The mandrel bar is rotated opposite to the rolling good rotary movement of the pipe blank. An adapter is screwed with the mandrel bar and the piercer, where the mandrel bar and the piercer have a thread head set against each other around an eccentricity measure. An independent claim is also included for a rolling mill for producing a seamless steel pipe in a continuous rolling process, including a longitudinal or transverse roll stand.

Description

Die Erfindung betrifft ein Verfahren und ein Walzwerk zum Herstellen von nahtlosen Stahlrohren in einem kontinuierlichen Walzprozess mit einem oder mehreren hintereinander angeordneten Längs- oder Schrägwalzgerüsten und einem beim Walzvorgang im Inneren des Walzguts verwendeten Innenwerkzeug, ausgebildet als Dornstange mit einem auf dieser vorne angeordnetem Lochdorn.The invention relates to a method and a rolling mill for producing seamless steel tubes in a continuous rolling process with one or more consecutively arranged longitudinal or Schrägwalzgerüsten and an inner tool used in the rolling process inside the rolling tool, designed as a mandrel with a perforated mandrel arranged on this front.

Die Herstellung nahtloser Rohre im Kontiwalzverfahren (kontinuierliches Rohrwalzverfahren) mit einem Kontiwalzwerk, auch Rohrkontiwalzwerk genannt, ist beispielsweise durch die DE-Z " Berg- und Hüttenmännische Monatshefte 130 (1985), Heft 7, Seiten 205 bis 211 ," bekannt geworden. Als Ausgangsmaterial dient zumeist gewalzter Rundstahl, vorwiegend als Rundstrangguss bis 350 mm Durchmesser, der in Längen bis zu 5 m in einem Drehherdofen auf Walztemperatur gebracht wird. Es erfolgt anschließend das Lochen des Massivblocks auf einem Lochwalzwerk, in der Regel ausgebildet als Schrägwalzwerk, zu einem dünnwandigen Hohlblock. Der so gefertigte Hohlblock wird dann in gleicher Wärme im Kontiwalzwerk über dem Innenwerkzeug zur Luppe ausgewalzt. Das Kontiwalzwerk besteht zumeist aus sechs bis neun dicht hintereinander liegenden Walzgerüsten, die gegeneinander jeweils verdreht angeordnet sind, beispielsweise um jeweils 90°. Die Walzenumfangsgeschwindigkeiten werden entsprechend den Querschnittsabnahmen aufeinander abgestimmt, so dass zwischen den Gerüsten keine nennenswerten Zug- oder Stauchkräfte auf das Walzgut wirken.The production of seamless tubes in the continuous rolling process (continuous tube rolling process) with a continuous rolling mill, also called tube rolling mill, is known, for example, from DE-Z " Berg- und Hüttenmännische Monatshefte 130 (1985), No. 7, pages 205 to 211 The raw material is mostly rolled round steel, mainly round extruded up to 350 mm diameter, which is brought to rolling temperature in lengths of up to 5 m in a rotary hearth furnace, followed by punching of the solid block on a piercing mill, usually formed The continuous block mill is then rolled out in the same heat in the continuous rolling mill above the inner tool to form a lump, the continuous rolling mill usually consisting of six to nine rolling stands arranged one behind the other, each being rotated in opposite directions, for example by 90 ° The roller circumferential speeds are matched to one another in accordance with the cross-sectional decreases, so that no appreciable tensile or compression forces act on the rolling stock between the stands.

Vor dem Beginn des Walzvorgangs im Kontiwalzwerk wird der Hohlblock mit der darin samt Lochdorn eingefädelten Dornstange als Innenwerkzeug, wie in einer Variante beispielsweise durch die DE 21 31 713 A1 bekannt geworden, von einer einlaufseitigen Dornstangenhalte- oder Verfahreinrichtung, fachüblich Retainer genannt, in Position gefahren und dann in das Kontiwalzwerk eingestoßen. Dort wird der Hohlblock von den Walzen erfasst und durch die von Gerüst zu Gerüst kleiner werdenden Walzkaliber auf der Dornstange ausgewalzt. Dabei nimmt die Dornstange mit dem Lochdorn infolge der zunehmenden Walzgutgeschwindigkeit auch eine immer größer werdende Geschwindigkeit an. Die Dornstange wird mittels der Dornstangenhalte- und Verfahreinrichtung mit während des Walzens kontrollierter, halb- oder vollgesteuerter Dornstangengeschwindigkeit nachgefahren.Before the start of the rolling process in the continuous rolling mill, the hollow block with the mandrel threaded therewith mandrel rod as an internal tool, as in a variant, for example, by the DE 21 31 713 A1 have become known from an inlet side Dornstangenhalte- or traversing, usually called retainer, driven into position and then pushed into the Kontiwalzwerk. There, the hollow block is detected by the rollers and rolled out by the skeleton from frame to frame becoming smaller rolling caliber on the mandrel. As a result of the increasing rolling stock speed, the mandrel bar with the piercer also assumes an ever-increasing speed. The mandrel bar is retracted by means of the mandrel bar holding and traversing device with controlled, semi or fully controlled mandrel bar speed during rolling.

Ein sowohl beim Schrägwalzen zum Lochen von Blöcken zu Hohlblöcken als auch beim Walzen des Hohlblockes zu einer Luppe in einem mehrgerüstigen Kontiwalzwerk bekanntes Problem ist es, dass sowohl aus rundem Vollmaterial oder aus rundem Hohlmaterial bestehende Dornstangen aufgrund der teilweise erheblichen Kräfte Verformungen erleiden. Die dabei auftretende Durchbiegung der Dornstange führt zu erhöhten Exzentrizitätswerten mit Taumelbewegungen des auf der Dornstange montierten Lochdorns. Es bewegt sich nämlich auch der Dorn am axialen Ende der Dornstange exzentrisch zu deren Längsachse. In der Folge kommt es zu Wanddickenungleichmäßigkeiten des Hohlblockes und der Luppe über deren Umfang.A problem known both in oblique rolling for punching blocks into hollow blocks and in rolling the hollow block into a billet in a multistage continuous rolling mill is that mandrels which are made of round solid material or of round hollow material undergo deformations due to the partially considerable forces. The resulting deflection of the mandrel rod leads to increased eccentricity with wobbling movements of the mandrel mounted on the mandrel. It also moves the mandrel at the axial end of the mandrel eccentric to the longitudinal axis. As a result, there are wall thickness irregularities of the hollow block and the billet over the circumference.

Eine solche taumelartige Bewegung kann aber nicht nur durch Ausbiegen der unter hohem Axialdruck stehenden Dornstange hervorgerufen werden, wobei die Längsachse des Lochdornes zur Walzgutachse einen Winkel einnimmt, d.h. kein paralleler Verlauf vorhanden ist. Die Exzentrizität der Drehbewegung des Lochdornes wird durch weitere, unschiedliche Faktoren bewirkt und in ihrer Höhe bestimmt, wie Materialinhomogenität, Temperaturgradienten im Querschnitt, unsymmetrische Krafteinwirkung der Werkzeuge und eine ungerade oder schwingende Dornstange.However, such a wobbly movement can be caused not only by bending out of the standing under high thrust mandrel, the longitudinal axis of the piercer to the rolling stock axis occupies an angle, ie no parallel course is present. The eccentricity of the rotary movement of the piercer is effected by other, unequal factors and determined in their height, such as material inhomogeneity, temperature gradients in the cross section, unbalanced Force of the tools and an odd or swinging mandrel.

Die bisherigen Lösungsansätze zur Reduzierung der Exzentrizität befassen sich damit, die vorgenannten Einflussgrößen zu kontrollieren und in ihrer negativen Wirkung möglichst klein zu halten. Die so erreichten minimalen Exzentrizitäten liegen aber immer noch im Bereich von 3 bis 5% und können nur schwer mit zudem hohem Aufwand während der Produktion niedrig gehalten werden.The previous approaches to reducing eccentricity are concerned with controlling the aforementioned influencing variables and keeping them as small as possible in their negative effects. However, the minimum eccentricities thus achieved are still in the range of 3 to 5% and can be kept low with high effort during production.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und ein Walzwerk zu schaffen, mit denen sich die genannten Nachteile, insbesondere Exzentrizitäten gelochter Hohlblöcke bzw. Luppen, zuverlässig vermeiden oder zumindest auf ein technisch machbares Maß verringern lassen.The invention is therefore based on the object to provide a method and a rolling mill, with which the said disadvantages, in particular eccentricities perforated hollow blocks or beads, reliably avoid or at least reduce to a technically feasible level.

Diese Aufgabe wird mit einem Verfahren erfindungsgemäß dadurch gelöst, dass dem Lochdorn eine der Walzgutdrehbewegung entgegengesetzte Rotationsbewegung auferlegt wird. Der Erfindung liegt die Erkenntnis zugrunde, dass durch Drehung der Dornstange entgegen der Rotationsbewegung des Walzgutes, in bevorzugter Ausführung eine entgegengesetzte exzentrische Rotationsbewegung des Lochdorns, der Mechanismus der Exzentrizitätsentstehung verhindert wird. Im Ergebnis ergibt sich eine deutliche Qualitätsverbesserung der Nahtlosrohrproduktion mit entsprechenden Kosteneinsparungen bei den Walzwerksbetreibern. Denn die die Exzentrizität ansonsten fördernden, negativen Einflüsse aus dem Walzwerksbetrieb mit Walzen von Rohren auf Dornstangen lassen sich auf diese Weise eliminieren.This object is achieved by a method according to the invention in that the piercer is imposed on the rolling material rotational movement opposite rotational movement. The invention is based on the finding that by rotation of the mandrel against the rotational movement of the rolling stock, in a preferred embodiment, an opposite eccentric rotational movement of the piercer, the mechanism of eccentricity is prevented. The result is a significant improvement in the quality of seamless tube production with corresponding cost savings for rolling mill operators. Because the eccentricity otherwise beneficial, negative influences from rolling mill operation with rolling of tubes on mandrel bars can be eliminated in this way.

Die der Erfindung zugrunde liegende Aufgabe wird mit einem Walzwerk erfindungsgemäß dadurch gelöst, dass der Dornstange eine diese während des Walzprozesses entgegengesetzt zur Walzgutdrehbewegung rotierende Antriebseinrichtung zugeordnet ist, beispielsweise als weiterer Bestandteil der einlaufseitigen Dornstangenhalte- oder Verfahreinrichtung.The object underlying the invention is achieved with a rolling mill according to the invention in that the mandrel rod during a rolling process opposite to the rolling stock rotation rotating drive device is assigned, for example, as a further component of the inlet side Dornstangenhalte- or traversing.

Ein bevorzugter Vorschlag der Erfindung sieht hierzu vor, dass die Dornstange über einen Adapter exzentrisch mit dem Lochdorn verbunden ist. Die zur Walzgutdrehbewegung entgegengesetzte Drehung der Dornstange findet hierdurch am Ort des Geschehens, dort wo die Luppe zwischen den Walzen auf dem Lochdorn voreilend ausgewalzt wird, als eine exzentrisch entgegengesetzte Rotation statt.A preferred proposal of the invention provides for this purpose that the mandrel bar is connected via an adapter eccentrically with the piercer. The rotation of the mandrel bar, which is opposite to that of the rolling-material rotation, thus takes place at the location of the event where the billet is advanced in advance between the rolls on the piercer, as an eccentrically opposite rotation.

Es wird erfindungsgemäß vorgeschlagen, dass der Adapter mit der Dornstange und dem Lochdorn verschraubt ist, wobei die Dornstange und der Lochdorn einander zugewandte, um ein Exzentrizitätsmaß gegeneinander versetzte Gewindeköpfe aufweisen. Dies kann in einfacher Weise dadurch erreicht werden, dass die Längsachsen bzw. Mittellinien einerseits des Dornstangen-Gewindekopfes und andererseits des Lochdorn-Gewindekopfes in der Höhe etwas gegeneinander versetzt sind, z.B. mehrere zehntel Millimeter oder mehrere Millimeter.It is proposed according to the invention that the adapter is screwed to the mandrel and the mandrel, wherein the mandrel and the mandrel facing each other, have a degree of eccentricity staggered threaded heads. This can be achieved in a simple manner in that the longitudinal axes or center lines on the one hand of the mandrel rod thread head and on the other hand of the piercer thread head are slightly offset in height from one another, e.g. several tenths of a millimeter or several millimeters.

Nach einer Ausgestaltung ist vorgesehen, dass die Gewindeköpfe mit Außengewinde und Anschlussenden des Adapters mit Innengewinde versehen sind. Der Adapter braucht somit lediglich auf die Dornstange und der demgegenüber sehr viel kürzere Lochdorn nur in das andere, freie Anschlussende des Adapters eingeschraubt zu werden. In diesem Zusammenhang ist zu erwähnen, dass das Exzentrizitätsmaß alternativ auch in den Anschlussenden des Adapters ausgebildet werden kann, d.h. die Innengewinde in den buchsen- bzw. topfartigen Anschlussenden weisen einen Versatz zueinander auf.According to one embodiment, it is provided that the threaded heads are provided with external thread and terminal ends of the adapter with internal thread. The adapter thus only needs to be screwed onto the mandrel rod and the much shorter mandrel in contrast only in the other, free terminal end of the adapter. In this connection, it should be mentioned that the measure of eccentricity can alternatively also be formed in the terminal ends of the adapter, i. the internal threads in the female or pot-like terminal ends have an offset from each other.

Wenn die Dornstange nach einem weiteren Vorschlag der Erfindung mit einem das axiale Widerstandsmoment erhöhenden Querschnittsprofil ausgebildet ist, lässt sich das Eliminieren von die Exzentrizität negativ beeinflussenden Größen begünstigen. Denn durch die Wahl des Querschnittsprofils kann das erhöhte Widerstandsmoment dazu beitragen, dass sich Durchbiegungen der Dornstange und damit Taumelbewegungen des Lochdorns mit den nachteiligen Exzentrizitäten entgegenwirken lässt.If, according to a further proposal of the invention, the mandrel bar is designed with a cross-sectional profile which increases the axial moment of resistance, the elimination of variables influencing the eccentricity can be promoted. Because by choosing the cross-sectional profile, the increased resistance moment contribute to the fact that deflections of the mandrel and thus wobbling movements of the piercer can counteract with the adverse eccentricities.

Bei einer innen gekühlten, rohrartigen Dornstange lässt sich diese vorteilhaft mit einer Innenprofilierung ausbilden, z.B. ein Kreuzprofil oder ein Innen-Sechseckprofil. Damit wird eine mögliche Durchbiegung bzw. ein Ausknicken der Dornstange infolge des Axialdrucks verringert, gleichzeitig aber eine für eine effektive Kühlung benötigte kleine Wanddicke der Dornstange beibehalten.In the case of an internally cooled tubular mandrel rod, it can be advantageously formed with an internal profiling, e.g. a cross profile or an internal hexagon profile. Thus, a possible deflection or buckling of the mandrel rod is reduced due to the axial pressure, while maintaining a required for effective cooling small wall thickness of the mandrel.

Weitere Merkmale und Einzelheiten der Erfindung ergeben sich aus den Ansprüchen und der nachfolgenden Beschreibung von in den Zeichnungen schematisch dargestellten Ausführungsbeispielen der Erfindung. Es zeigen:

Fig. 1
im Querschnitt als Einzelheit eines Schräg- oder Längswalzgerüstes ein Walzenpaar, eine Rohrluppe und eine angetriebene Dornstange;
Fig. 2
als Längsansicht ein Innenwerkzeug, bei dem ein Adapter die Dornstange mit einem Lochdorn exzentrisch verbindet;
Fig. 3
im Querschnitt eine mit einer Innenprofilierung als Kreuzprofil ausgebildeten Dornstange; und
Fig. 4
eine mit einer Innenprofilierung als Sechseckprofil ausgebildete Dornstange.
Further features and details of the invention will become apparent from the claims and the following description of schematically illustrated in the drawings embodiments of the invention. Show it:
Fig. 1
in cross section as a detail of a slanting or longitudinal rolling stand, a pair of rollers, a tube blank and a driven mandrel bar;
Fig. 2
as a longitudinal view of an internal tool, in which an adapter connects the mandrel rod with a punch mandrel eccentric;
Fig. 3
in cross-section, a mandrel formed with an inner profiling as cross-profile; and
Fig. 4
a trained with an internal profiling hexagon profile mandrel.

Zur Herstellung eines Nahtlosrohres wird, wie in Fig. 1 schematisch dargestellt, das Walzgut bzw. eine Rohrluppe 1 auf einem in das Innere der Rohrluppe 1 eingebrachten Innenwerkzeug 2 zwischen Walzen 3, 4 ausgewalzt. Das Innenwerkzeug 2, das aus einer Dornstange 2a und einem an deren vorderem Ende angeordnetem Lochdorn 2b besteht, besitzt einen runden Querschnitt, zu dem die den Außenumfang der Rohrluppe 1 walzenden Walzen 3, 4 mit einer korrespondierenden Kontur ausgebildet sind, d.h. sie sind im Radialschnitt kreisbogenförmig. Bei entsprechend relativ zum Innenwerkzeug 2 angestellten Walzen 3, 4 ergibt sich damit ein Walzspalt, der die gewünschte Kreisringform definiert, die die Rohrluppe 1 beim Walzen zum Rohr annimmt.To produce a seamless tube, as in Fig. 1 schematically shown, the rolling stock or a tube blank 1 on a introduced into the interior of the tube blank 1 internal tool 2 between rollers 3, 4 rolled. The inner tool 2, which consists of a mandrel 2a and arranged at the front end Piercing mandrel 2b is, has a round cross-section, to which the outer periphery of the tube blank 1 rolling rollers 3, 4 are formed with a corresponding contour, ie they are circular arc in radial section. In accordance with relative to the inner tool 2 employed rollers 3, 4 thus results in a nip, which defines the desired circular shape, which assumes the tube blank 1 during rolling to the tube.

Der in Fig. 1 ideale Ringquerschnitt mit gewünschter Rundheit und einheitlicher Wanddicke d der Rohrluppe 1 bzw. des herzustellenden nahtlosen Rohres wird dadurch erreicht, dass dem Innenwerkzeug 2, d.h. dem Lochdorn 2b mit der Dornstange 2a mittels einer Antriebseinrichtung 5 eine durch Pfeil 7 angedeutete Rotationsbewegung aufgezwungen wird, die entgegengesetzt zu der durch Pfeil 6 angedeuteten, beim Walzen unvermeidlichen Walzgutdrehbewegung der Rohrluppe 1 bzw. des Rohres ist.The in Fig. 1 ideal annular cross-section with desired roundness and uniform wall thickness d of the tube blank 1 or of the produced seamless tube is achieved that the inner tool 2, ie the mandrel 2b with the mandrel 2a by means of a drive means 5 imposed by an arrow 7 rotation is imposed, the opposite to the indicated by arrow 6, during rolling unavoidable Walzgutdrehbewegung the tube blank 1 and der Rohres ist.

Wenn das Innenwerkzeug 2, wie in Fig. 2 dargestellt, mit einem am axialen, vorderen Ende der Dornstange 2a exzentrisch angeordnetem Lochdorn 2b ausgebildet ist, führt der Lochdorn eine der Walzgutdrehbewegung 6 entgegengesetzte exzentrische Rotationsbewegung 7a aus. Die Dornstange 2a ist hierzu über einen Adapter 8 mit dem Lochdorn 2b verbunden, und zwar verschraubt, wobei die Dornstange 2a und der Lochdorn 2b einander zugewandte, um ein Exzentrizitätsmaß 9 gegeneinander versetzte Gewindeköpfe 10a bzw. 10b besitzen. Die Mittellinie bzw. Längsachse 11a der Dornstange 2a verläuft somit um das Exzentermaß 9 versetzt zur Mittellinie bzw. Längsachse 11 b des Lochdorns 2b. Der im Querschnitt zylindrische Adapter 8 weist topfartige Anschlussenden 12a bzw. 12b auf, die mit einem Innengewinde ausgebildet sind und auf Außengewinde der Gewindeköpfe 10a, 10b aufgeschraubt werden; die Anschlussgewindeverbindungen 13a, 13b sind durch Pfeile angedeutet.When the indoor tool 2, as in Fig. 2 shown formed with a at the axial front end of the mandrel 2a eccentrically arranged piercer 2b, the piercer performs a Walzgutdrehbewegung 6 opposite eccentric rotational movement 7a. The mandrel 2a is for this purpose connected via an adapter 8 with the piercer 2b, and screwed, with the mandrel 2a and the piercer 2b facing each other, an eccentricity 9 offset from each other threaded heads 10a and 10b have. The center line or longitudinal axis 11a of the mandrel rod 2a thus extends around the eccentric 9 offset from the center line or longitudinal axis 11b of the piercer 2b. The cylindrical cross-section adapter 8 has pot-like connection ends 12a and 12b, which are formed with an internal thread and are screwed onto external threads of the threaded heads 10a, 10b; the connection thread connections 13a, 13b are indicated by arrows.

Die Dornstange des Innenwerkzeugs lässt sich mit einem das axiale Widerstandsmoment erhöhenden Querschnittsprofil ausbilden. Das kann eine Durchbiegungen verhindernde bzw. weitestgehend verringernde Mantel- bzw. Außenprofilierung einer Vollmaterial-Dornstange sein. Bei den in den Fig. 3 und 4 dargestellten rohrartigen Dornstangen 102a bzw. 102b sind diese mit einer Innenprofilierung 14 ausgebildet, nach Fig. 3 als Kreuzprofil 14a und nach Fig. 4 als Innen-Sechseckprofil 14b.The mandrel of the inner tool can be formed with an axial moment of resistance increasing cross-sectional profile. This can be a deflection-preventing or largely reducing coat or external profiling of a solid material mandrel. In the in the 3 and 4 shown tubular mandrel rods 102a and 102b are formed with an inner profiling 14, according to Fig. 3 as cross profile 14a and after Fig. 4 as inner hexagon profile 14b.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Rohrluppetube blank
22
Innenwerkzeuginternal tool
2a2a
Dornstangemandrel
2b2 B
Lochdornpiercer
33
Walzeroller
44
Walzeroller
55
Antriebseinrichtungdriving means
66
Pfeil Walzgutdrehbewegung (der Rohrluppe/des Rohres)Pfeil Rolling material rotation (of the tube blank / of the tube)
77
Rotationsbewegung (des Innenwerkzeugs bzw. der Dornstange mit Lochdorn)Rotational movement (of the inner tool or of the mandrel with perforated mandrel)
7a7a
exzentrische Rotationsbewegung (des Lochdorns)eccentric rotation (of the piercer)
88th
Adapteradapter
99
Exzentrizitätsmaßeccentricity
10a10a
Gewindekopf (der Dornstange)Threaded head (the mandrel bar)
10b10b
Gewindekopf (des Lochdorns)Thread head (of the piercer)
11a11a
Mittellinie/Längsachse (der Dornstange)Centerline / Longitudinal axis (the mandrel bar)
11 b11 b
Mittellinie/Längsachse (des Lochdorns)Centerline / Longitudinal axis (of the piercer)
12a12a
Anschlussende (des Adapters)Connecting end of the adapter
12b12b
Anschlussende (des Adapters)Connecting end of the adapter
13a13a
Anschluss-Gewindeverbindung (Pfeil)Connection threaded connection (arrow)
13b13b
Anschluss-Gewindeverbindung (Pfeil)Connection threaded connection (arrow)
1414
InnenrofilierungInnenrofilierung
14a14a
Kreuzprofilcross profile
14b14b
Innen-SechseckprofilInternal hexagonal profile
102a102
innenprofilierte Dornstange (Kreuzprofil)internally profiled mandrel (cross profile)
102b102b
innenprofilierte Dornstange (Sechseckprofil)internally profiled mandrel (hexagonal profile)

Claims (9)

Verfahren zum Herstellen von nahtlosen Stahlrohren in einem kontinuierlichen Walzprozess mit einem oder mehreren hintereinander angeordneten Längs- oder Schrägwalzgerüsten und einem beim Walzvorgang im Inneren des Walzguts (1) verwendeten Innenwerkzeug (2), ausgebildet als Dornstange (2a) mit einem auf dieser vorne angeordnetem Lochdorn (2b),
dadurch gekennzeichnet,
dass dem Lochdorn (2b) eine der Walzgutdrehbewegung (6) entgegengesetzte Rotationsbewegung (7; 7a) auferlegt wird.A method for producing seamless steel tubes in a continuous rolling process with one or more consecutively arranged longitudinal or Schrägwalzgerüsten and a rolling process inside the rolling stock (1) used inner tool (2) formed as a mandrel (2a) with a perforated mandrel arranged on this front (2 B),
characterized,
that the piercing mandrel (2b) is subjected to a rotational movement (7; 7a) which is opposite to the rolling-material rotational movement (6). Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass die Dornstange (2a) entgegengesetzt zur Walzgutdrehbewegung (6) gedreht wird.Method according to claim 1,
characterized,
that the mandrel rod (2a) opposite to the Walzgutdrehbewegung (6) is rotated. Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass dem Lochdorn (2b) eine entgegengesetzte exzentrische Rotationsbewegung (7a) auferlegt wird.Method according to claim 1 or 2,
characterized,
that the piercing mandrel (2b) an opposite eccentric rotational movement (7a) is imposed. Walzwerk zum Herstellen von nahtlosen Stahlrohren in einem kontinuierlichen Walzprozess mit einem oder mehreren hintereinander angeordneten Längs- oder Schrägwalzgerüsten und einem beim Walzvorgang im Inneren des Walzguts (1) verwendeten Innenwerkzeug (2), ausgebildet als Dornstange (2a mit einem auf dieser vorne angeordnetem Lochdorn (2b), insbesondere zum Durchführen des Verfahrens nach Anspruch 1,
dadurch gekennzeichnet,
dass der Dornstange (2a) eine diese während des Walzprozesses entgegengesetzt zur Walzgutdrehbewegung (6) rotierende Antriebseinrichtung (5) zugeordnet ist.Rolling mill for producing seamless steel tubes in a continuous rolling process with one or more longitudinal or Schrägwalzgerüsten arranged one behind the other and an inner tool (2) used in the rolling process inside the rolling stock (1), designed as Mandrel bar (2a with a perforated mandrel (2b) arranged on this front, in particular for carrying out the method according to claim 1,
characterized,
in that the mandrel bar (2a) is associated with a drive device (5) which rotates this during the rolling process in opposition to the rolling-material rotation movement (6). Walzwerk nach Anspruch 4,
dadurch gekennzeichnet,
dass die Dornstange (2a) über einen Adapter (8) exzentrisch mit dem Lochdorn (2b) verbunden ist.Rolling mill according to claim 4,
characterized,
in that the mandrel rod (2a) is connected eccentrically to the piercing mandrel (2b) via an adapter (8). Walzwerk nach Anspruch 5,
dadurch gekennzeichnet,
dass der Adapter (8) mit der Dornstange (2a) und dem Lochdorn (2b) verschraubt ist, wobei die Dornstange (2a) und der Lochdorn (2b) einander zugewandte, um ein Exzentrizitätsmaß (9) gegeneinander versetzte Gewindeköpfe (10a; 10b) aufweisen.Rolling mill according to claim 5,
characterized,
in that the adapter (8) is screwed to the mandrel rod (2a) and the piercer (2b), wherein the mandrel rod (2a) and the mandrel (2b) facing each other to an eccentricity measure (9) mutually offset threaded heads (10a, 10b) exhibit. Walzwerk nach Anspruch 6,
dadurch gekennzeichnet,
dass die Gewindeköpfe (10a; 10b) mit Außengewinde und Anschlussenden (12a; 12b) des Adapters (8) mit Innengewinde versehen sind.Rolling mill according to claim 6,
characterized,
in that the threaded heads (10a, 10b) are provided with external threads and connection ends (12a, 12b) of the adapter (8) with internal threads. Walzwerk nach Anspruch 4 oder 5,
dadurch gekennzeichnet,
dass die Dornstange (2a; 102a, 102b) mit einem das axiale Widerstandsmoment erhöhenden Querschnittsprofil ausgebildet ist.Rolling mill according to claim 4 or 5,
characterized,
in that the mandrel bar (2a, 102a, 102b) is formed with a cross-sectional profile which increases the axial moment of resistance. Walzwerk nach Anspruch 8,
dadurch gekennzeichnet,
dass eine rohrartige Dornstange (102a, 102b) mit Innenprofilierung (14; 14a, 14b) ausgebildet ist.Rolling mill according to claim 8,
characterized,
in that a tubular mandrel bar (102a, 102b) with internal profiling (14; 14a, 14b) is formed.
EP20080020693 2007-12-07 2008-11-28 Method and rolling mill to produce wireless steel pipes Active EP2067542B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007059320 2007-12-07
DE102008056988A DE102008056988A1 (en) 2007-12-07 2008-11-12 Seamless steel pipe producing method for rolling mill, involves providing inner tool in interior of pipe blank, where rotation movement opposite to rotary movement of pipe blank is imposed to piercer

Publications (2)

Publication Number Publication Date
EP2067542A1 true EP2067542A1 (en) 2009-06-10
EP2067542B1 EP2067542B1 (en) 2012-03-07

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012107375A1 (en) 2011-08-12 2013-02-14 GFM - GmbH Device for forging hollow component e.g. pipe, has control unit that controls rotary drive element in dependence on rotational position of forging mandrel with respect to forging tools that are arranged symmetrically about forging axis
EP2692458A1 (en) 2012-08-01 2014-02-05 Benteler Deutschland GmbH Method and device for producing a metallic hollow block from a metallic block

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2131713A1 (en) 1970-06-25 1972-02-03 Innocenti Soc Gen Per L Ind Me Tube rolling mill
DE3618949A1 (en) * 1985-07-12 1987-01-15 Kocks Technik METHOD FOR CROSS ROLLING SEAMLESS TUBE TUBE
EP1764167A1 (en) * 2005-09-20 2007-03-21 SMS Meer GmbH Method and rolling mill for manufacturing a seamless tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2131713A1 (en) 1970-06-25 1972-02-03 Innocenti Soc Gen Per L Ind Me Tube rolling mill
DE3618949A1 (en) * 1985-07-12 1987-01-15 Kocks Technik METHOD FOR CROSS ROLLING SEAMLESS TUBE TUBE
EP1764167A1 (en) * 2005-09-20 2007-03-21 SMS Meer GmbH Method and rolling mill for manufacturing a seamless tube

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BERG- UND HÜTTENMÄNNISCHE MONATSHEFTE 130, vol. 7, 1985, pages 205 - 211

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012107375A1 (en) 2011-08-12 2013-02-14 GFM - GmbH Device for forging hollow component e.g. pipe, has control unit that controls rotary drive element in dependence on rotational position of forging mandrel with respect to forging tools that are arranged symmetrically about forging axis
DE102012107375B4 (en) * 2011-08-12 2021-02-25 GFM - GmbH Device for forging a hollow body
EP2692458A1 (en) 2012-08-01 2014-02-05 Benteler Deutschland GmbH Method and device for producing a metallic hollow block from a metallic block
DE102012107041A1 (en) 2012-08-01 2014-02-06 Benteler Deutschland Gmbh Method and device for producing a metallic hollow block from a metallic block
DE102012107041B4 (en) * 2012-08-01 2014-05-15 Benteler Deutschland Gmbh Method and device for producing a metallic hollow block from a metallic block

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