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EP0339033B1 - Double roller crossrolling mill for piercing and stretching solid and hollow blocks - Google Patents

Double roller crossrolling mill for piercing and stretching solid and hollow blocks Download PDF

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Publication number
EP0339033B1
EP0339033B1 EP88900345A EP88900345A EP0339033B1 EP 0339033 B1 EP0339033 B1 EP 0339033B1 EP 88900345 A EP88900345 A EP 88900345A EP 88900345 A EP88900345 A EP 88900345A EP 0339033 B1 EP0339033 B1 EP 0339033B1
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EP
European Patent Office
Prior art keywords
stand
halves
rolling mill
double roller
mill according
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.)
Expired - Lifetime
Application number
EP88900345A
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German (de)
French (fr)
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EP0339033A1 (en
Inventor
Johann Heinrich Rohde
Hans Meurer
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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Filing date
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Priority to AT88900345T priority Critical patent/ATE65435T1/en
Publication of EP0339033A1 publication Critical patent/EP0339033A1/en
Application granted granted Critical
Publication of EP0339033B1 publication Critical patent/EP0339033B1/en
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
    • B21B31/02—Rolling stand frames or housings; Roll mountings ; Roll chocks
    • B21B31/04—Rolling stand frames or housings; Roll mountings ; Roll chocks with tie rods in frameless stands, e.g. prestressed tie rods

Definitions

  • the invention relates to a two-roll cross-rolling mill for punching solid and hollow blocks, in which the rolls are adjustably arranged in the roll stand.
  • Cross roll mills have been used for many years, particularly in steel tube production. They have been continuously improved and developed.
  • the current state of the art is represented by DE-C-21 56 595.
  • the rolling stand of this system is equipped with rollers lying one above the other and with swiveling and adjustable guide disks arranged on the side.
  • the rollers themselves are mounted in roller mills, which are held in a vertically adjustable manner by a roller stand.
  • the roller mills are adjusted by two motor-driven threaded spindles, which are kept free of play by a hydraulic retention cylinder.
  • the so-called feed angle of the rolls which causes the helical movement of the rolling stock, can be changed.
  • the roller mills are designed as drums that can rotate in the stand.
  • the feed angle is infinitely adjustable, unless the roller mills are adjusted in a simplified embodiment by supplements.
  • the adjustment of the feed angle is not infinitely variable; in addition, the conversion of the rolling stand is time-consuming.
  • the present invention has for its object to provide a two-roll cross-rolling mill, which does not have the disadvantages described and allows a simple and short-term roll change or stand change with low height and low-expansion design with little mechanical effort.
  • the roll stand is divided into two stand halves, each holding a roll and possibly its chocks, and detachably connected stand halves, and the stand halves for adjusting the feed angle of the rolls can be pivoted relative to one another about a common axis that intersects the rolling stock axis at a right angle are.
  • a stationary central frame connected to the foundation is preferably provided between the stand halves which can be pivoted relative to one another.
  • the overall height can be made significantly lower because the large-dimensioned roller mills are eliminated.
  • the adjustment of the feed angle can be carried out continuously by pivoting the stand halves against each other and with them the rollers displaced in the chocks of the stand halves. In this way, the total height of the roll stand can be reduced by approximately 50% with the same roll diameter. This is accompanied by a weight reduction of at least approx. 50%.
  • connection of the stand halves takes place by means of prestressed tie rods penetrating the stand halves on both sides of the rolling stock axis, with a side play allowing the stand halves to be rotated between the tie rods and the bores of the stand halves penetrated by them. Due to the relatively short tie rods prestressing the stand, the spring deflection of the stand is minimized in such a way that substantially improved tolerances of the rolling stock can be achieved.
  • the tie rods penetrating and connecting the stand halves can be designed as stud bolts which are fastened to the central frame on both sides.
  • the prestressing of the stand halves against one another or against the central frame can be applied in a known manner by means of hydraulic clamping nuts; the preload is released before twisting the halves against each other.
  • the tie rods penetrating the central frame are rotatably mounted therein and are provided at both ends with threads of different pitch direction in the bore through which they penetrate each stand half, and adjusting nuts with a corresponding counter thread are arranged in the stand halves.
  • the bores of the middle frame are provided in the region of their ends facing the scaffold halves with threads of different pitch directions, in which threaded bushes provided with a corresponding external thread are rotatably and axially adjustable, with the threaded bushes on the inside of them the multi-wedge profiles applied to the tie rods correspond and the tie rods for the opposite adjustment of the threaded bushes acting with their end faces on the thread halves in the sense of a movement towards or away from each other are rotatably mounted and at least one joint of the tie rod interacts with a piston-cylinder unit, with which the prestressing force of the scaffold can be applied.
  • This proposal allows both the setting of the scaffold halves against each other and the prestressing via the tie rods.
  • the adjustment mechanism for synchronously rotating the stator halves is supported on the foundation of the roll stand and / or on the middle frame.
  • the adjustment can be carried out by synchronously operating piston-cylinder units, gears or counter-rotating eccentrics.
  • the middle frame accommodate the known guides for the rolling stock, such as inserts and versions, side guides, swivel arms for washer disks or the like. These parts can remain stationary together with the middle frame if the rollers have to be changed.
  • the latter is done according to a favorable feature of the invention after loosening the connection of the stator halves in that at least one of the rollers and their chocks can be removed together with the respective stator half.
  • the dismantled stand half can be replaced as quickly as possible with another stand half that has already been prepared, after the second chock with the counter roller has been replaced with another.
  • the parting plane between the stand halves can run both horizontally and vertically.
  • Fig. 1 denotes the central frame connected to the foundation 7, which carries the upper stand half 2 and the lower stand half 3 of the two-roll cross-rolling mill according to the invention.
  • the rollers are designated 4 (top roller) and 5 (bottom roller), 6 numbers one of the two guide disks which are mounted on the middle frame 1 by means of known swivel arms.
  • the rolling axis is indicated at 8 in FIG. 1.
  • the upper stand half 2 and the lower stand half 3 are held together with the aid of tie rods 9, four of which are provided on both sides of the rolling stock axis, possibly under tension.
  • the open holes on one side for the tie rods in the upper half of the stand allow the tie rods to be relaxed beforehand and the stand halves to be rotated to a 0-degree feed angle without removing any other parts.
  • the adjusting gear 16 are provided in the lower half of the stand. Since the rollers 4 and 5 are mounted in chocks 23, 24 of known type in the respective stator halves, the rollers are adjusted by rotating the stator halves.
  • a construction as shown in FIG. 3 is provided for adjusting the rollers in the vertical direction.
  • the tie rod 9 penetrates the upper and lower stator halves 2 and 3 and the middle frame 1.
  • nuts 13 which are provided with the same but opposite internal threads.
  • threaded bushings 14 move in opposite directions due to the different thread pitches when they are turned.
  • a drive motor 16 at one end of the tie rod serves to rotate the tie rod; the other tie rod end 17 is designed as an abutment of the tie rod.
  • a hydraulic piston 17 is provided for applying prestressing forces, which cooperates with the hydraulic cylinder 18 and, when pressurized with pressure medium, applies a tensile force to the tie rod 9 in order to brace the frame halves 2 and 3 against one another.
  • the scaffolding halves 2 and 3 are adjusted against each other as described below:
  • the tie rod is relaxed. This can now be rotated via the drive motor 16, the threaded bushings 14 being rotated via the splined shaft profile 15 and being moved in the axial direction.
  • the threaded bushes 14 press with their end faces against support rings 19, which in turn press the frame halves 2 and 3 apart.
  • the upper end of the tie rod is held by a threaded bushing 20 and corresponding thread, so that the lower stand half 3 does not fall down due to its own weight.
  • the swivel drives 11 shown in FIGS. 1 and 2 can be actuated for the scaffold halves, the movement of which is blocked after the scaffold halves have been braced during the rolling operation.
  • FIG. 5 shows an example of how the roll removal can take place in the new two-roll cross-rolling mill.
  • the scaffold halves 2 and 3 are expediently set to a feed angle of 0 degrees and the upper scaffold half 2 is attached to a hoist and this together with the upper roller 4 and the lower roller 5 attached to it by means of a connecting element 22 upwards pulled out of the lower half of the scaffold 3 and the middle frame.
  • a correspondingly prepared new set of rollers can be used in the same way, so that the stand change times can be extremely short and the effort involved in changing the stand can be kept low.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Paints Or Removers (AREA)

Abstract

A double roller crossrolling mill for piercing and stretching solid and hollow blocks has adjustable rollers arranged in roller stands. In order to obtain a double roller crossrolling mill with reduced height and limited extension, and which allows the rollers or the frame to be easily and quickly changed, it is proposed that the roller stands be divided into two halves (2, 3) detachably linked to each other, each supporting one roller (4, 5) and if necessary its chocks (23, 24). To adjust the advance angle of the rollers (4, 5) with respect to each other, the halves (2, 3) of the stand can swing around a common axis (A-A) normal to the axis (8) of the rolling stock.

Description

Die Erfindung betrifft ein Zweiwalzenschrägwalzwerk zum Lochen von Massiv- und Hohlblöcken, bei dem die Walzen verstellbar im Walzenständer angeordnet sind.The invention relates to a two-roll cross-rolling mill for punching solid and hollow blocks, in which the rolls are adjustably arranged in the roll stand.

Schrägwalzwerke werden seit vielen Jahren, insbesondere in der Stahlrohrherstellung eingesetzt. Sie wurden ständig verbessert und weiterentwickelt. Der derzeitige Stand der Technik wird durch DE-C-21 56 595 wiedergegeben. Das Walzgerüst dieser Anlage ist mit übereinander liegenden Walzen sowie mit seitlich angeordreten ausschwenkbaren und einstellbaren Führungsscheiben ausgerüstet. Die Walzen selbst sind in Walzenstühlen gelagert, die in vertikaler Richtung verstellbar von einem Walzenständer aufgenommen werden. Die Verstellung der Walzenstühle wird durch je zwei motorisch angetriebene Gewindespindeln durchgeführt, die durch einen hydraulischen Rückhaltezylinder spielfrei gehalten werden.Cross roll mills have been used for many years, particularly in steel tube production. They have been continuously improved and developed. The current state of the art is represented by DE-C-21 56 595. The rolling stand of this system is equipped with rollers lying one above the other and with swiveling and adjustable guide disks arranged on the side. The rollers themselves are mounted in roller mills, which are held in a vertically adjustable manner by a roller stand. The roller mills are adjusted by two motor-driven threaded spindles, which are kept free of play by a hydraulic retention cylinder.

Der sogenannte Vorschubwinkel der Walzen, der die schraubenlinienförmige Bewegung des Walzgutes bewirkt, ist veränderbar. Dazu werden die Walzenstühle als Trommeln ausgebildet, die sich im Gerüstständer drehen können. Auf diese Weise ist der Vorschubwinkel stufenlos einstellbar, es sei denn, die Walzenstühle werden in vereinfachter Ausführungsform durch Beilagen verstellt. In diesem fall ist die Einstellung des Vorschubwinkels nicht stufenlos; außerdem ist der Umbau dis Walzgerüstes zeitaufwendig.The so-called feed angle of the rolls, which causes the helical movement of the rolling stock, can be changed. For this purpose, the roller mills are designed as drums that can rotate in the stand. In this way, the feed angle is infinitely adjustable, unless the roller mills are adjusted in a simplified embodiment by supplements. In this case, the adjustment of the feed angle is not infinitely variable; in addition, the conversion of the rolling stand is time-consuming.

Diese Bauweise bekannter Zweiwalzenschrägwalzwerke ist nachteilig, weil die Größe der Walzenstühle einen Walzenständer von beachtlicher Höhe erforderlich macht, die über alles gemessen unter Umständen 8 bis 10 Meter betragen kann. Bedingt durch die gegebene Walzenmitte über Hüttenflur, steht der Gerüstständer in einer tiefen Fundamentgrube. Als Folge davon müssen auch die Kanäle für die Ableitung des Kühlwassers tief unter Hüttenflur ausgeführt werden.This design of known two-roll cross-rolling mills is disadvantageous because the size of the roll mills requires a roll stand of considerable height, which can be 8 to 10 meters measured under all circumstances. Due to the given center of the roller above the hut floor, the stand stands in a deep foundation pit. As a result, the channels for the drainage of the cooling water must also be carried out deep under the hut floor.

Da beim Schrägwalzen meist ein Innenwerkzeug eingesetzt wird, das sich über eine Walzstange in einem Widerlager abstützt, müssen die hierbei auftretenden Reaktionskräfte von den relativ langen Ständersäulen aufgenommen werden, was zu erheblichen Durchbiegungen derselben führt.Since an internal tool, which is supported by a roller rod in an abutment, is usually used for cross-rolling, the reaction forces that occur here have to be absorbed by the relatively long stator columns, which leads to considerable deflection of the columns.

Auch sind infolge des hohen Gerüstständers aus den Walzkräften resultierende Ständersäulendehnungen zu erwarten, die den Walzspalt vergrößern und die Abmessungen des Walzgutes verungleichmäßigen.As a result of the high stand, the column column expansions resulting from the rolling forces are to be expected, which enlarge the roll gap and make the dimensions of the rolling stock uneven.

Aus der Dimensionierung des Gerüstständers und der Verwendung der Walzenstühle ergibt sich schließlich auch ein komplizierter und aufwendiger Ausbau der Walzen, vor dem zunächst schwere Gerüstdeckel und Fensterklappen gelöst, geschwenkt bzw. komplett entfernt werden müssen, um Zugang zu den Walzenstühlen zu schaffen. Dazu ist ein Kran oder eine separate Wechselvorrichtung erforderlich; der Ausbau ist zeitlich und mechanisch aufwendig.The dimensioning of the scaffold stand and the use of the roller mills ultimately also result in a complicated and complex dismantling of the rollers, in front of which heavy scaffold covers and window flaps first have to be loosened, pivoted or completely removed in order to gain access to the roller mills. This requires a crane or a separate changing device; the expansion is time and mechanically complex.

Ausgehend von dem Stand der Technik und den geschilderten Nachteilen liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Zweiwalzenschrägwalzwerk zu schaffen, das die geschilderten Nachteile nicht aufweist und mit niedriger Bauhöhe in dehnungsarmer Ausführung bei geringem mechanischem Aufwand einen einfachen und kurzzeitigen Walzenwechsel oder Gerüstwechsel ermöglicht.Based on the prior art and the disadvantages described, the present invention has for its object to provide a two-roll cross-rolling mill, which does not have the disadvantages described and allows a simple and short-term roll change or stand change with low height and low-expansion design with little mechanical effort.

Zur Lösung der Aufgabe wird vorgeschlagen, daß der Walzenständer in zwei je eine Walze und ggfs. deren Einbaustücke aufnehmende, miteinander lösbar verbundene Ständerhälften aufgeteilt ist und die Ständerhälften zur Verstellung des Vorschubwinkels der Walzen gegeneinander um eine gemeinsame, die Walzgutachse im rechten Winkel schneidende Achse verschwenkbar sind. Vorzugsweise ist zwischen den gegeneinander verschwenkbaren Ständerhälften ein ortsfester, mit dem Fundament verbundener Mittelrahmen vorgesehen.To solve the problem, it is proposed that the roll stand is divided into two stand halves, each holding a roll and possibly its chocks, and detachably connected stand halves, and the stand halves for adjusting the feed angle of the rolls can be pivoted relative to one another about a common axis that intersects the rolling stock axis at a right angle are. A stationary central frame connected to the foundation is preferably provided between the stand halves which can be pivoted relative to one another.

Bei derartig ausgeführten Zweiwalzenschrägwalzwerken kann die Bauhöhe wesentlich niedriger ausgeführt werden, weil die groß dimensionierten Walzenstühle entfallen. Die Einstellung des Vorschubwinkels kann stufenlos dadurch erfolgen, daß die Ständerhälften gegeneinander verschwenkt werden und mit ihnen die in den Einbaustücken der Ständerhälften verlagerten Walzen. Auf diese Weise läßt sich die Gesamthöhe des Walzgerüstes bei gleichem Walzendurchmesser um etwa 50% reduzieren. Damit geht eine Gewichtsverringerung um mindestens ca. 50% einher.In the case of two-roll diagonal rolling mills of this type, the overall height can be made significantly lower because the large-dimensioned roller mills are eliminated. The adjustment of the feed angle can be carried out continuously by pivoting the stand halves against each other and with them the rollers displaced in the chocks of the stand halves. In this way, the total height of the roll stand can be reduced by approximately 50% with the same roll diameter. This is accompanied by a weight reduction of at least approx. 50%.

Nach einem weiteren Merkmal der Erfindung wird vorgeschlagen, daß die Verbindung der Ständerhälften mittels vorgespannter, die Ständerhälften beidseitig der Walzgutachse duchdringender Zuganker erfolgt, wobei zwischen Zugankern und den von Ihnen durchdrungenen Bohrungen der Ständerhälften ein das Verdrehen der Ständerhälften ermöglichendes Seitenspiel vorhanden ist. Durch die das Gerüst vorspannenden relativ kurzen Zuganker wird die Auffederung des Gerüstes so minimiert, daß wesentlich verbesserte Walzguttoleranzen erzielbar sind.According to a further feature of the invention, it is proposed that the connection of the stand halves takes place by means of prestressed tie rods penetrating the stand halves on both sides of the rolling stock axis, with a side play allowing the stand halves to be rotated between the tie rods and the bores of the stand halves penetrated by them. Due to the relatively short tie rods prestressing the stand, the spring deflection of the stand is minimized in such a way that substantially improved tolerances of the rolling stock can be achieved.

Bei einem Zweiwalzenschrägwalzwerk der erfindungsgemäßen Art mit Mittelrahmen können die die Ständerhälften durchdringenden und verbindenden Zuganker als Stehbolzen ausgebildet sein, die beidseitig am Mittelrahmen befestigt sind. Die Vorspannung der Ständerhälften gegeneinander bzw. gegenüber dem Mittelrahmen kann in bekannter Weise mittels Hydraulik-Spannmuttern aufgebracht werden; vor dem Verdrehen der Hälften gegeneinander wird die Vorspannung gelöst.In a two-roll cross-rolling mill of the type according to the invention with a central frame, the tie rods penetrating and connecting the stand halves can be designed as stud bolts which are fastened to the central frame on both sides. The prestressing of the stand halves against one another or against the central frame can be applied in a known manner by means of hydraulic clamping nuts; the preload is released before twisting the halves against each other.

Nach einem anderen Merkmal der Erfindung ist vorgesehen, daß die den Mittelrahmen durchdringenden Zuganker in diesem drehbar gelagert sind und beidendig im Bereich der von Ihnen durchdrungenen Bohrung jeder Ständerhälfte mit Gewinden unterschiedlicher Steigungsrichtung versehen sind und in den Ständerhälften Stellmuttern mit entsprechendem Gegengewinde angeordnet sind. Dieser Vorschlag ermöglicht eine günstige Einstellung des Walzspaltes durch Verdrehen der Zuganker, deren unterschiedliche Gewinde ein Auseinander bzw. Zusammenbewegen der Ständerhälften bewirken. Dabei können alle derartig ausgebildeten Zuganker von einem gemeinsamen Antrieb betätigt werden.According to another feature of the invention, it is provided that the tie rods penetrating the central frame are rotatably mounted therein and are provided at both ends with threads of different pitch direction in the bore through which they penetrate each stand half, and adjusting nuts with a corresponding counter thread are arranged in the stand halves. This proposal enables a favorable adjustment of the roll gap by turning the tie rods, the different threads of which cause the stand halves to move apart or move together. All tie rods designed in this way can be actuated by a common drive.

In einer günstigen Ausgestaltung der Erfindung wird vorgeschlagen, daß die Bohrungen des Mittelrahmens im Bereich ihrer den Gerüsthälften zugewandten Enden mit Gewinden unterschiedlicher Steigungsrichtung versehen sind, in denen mit entsprechendem Außengewinde versehene Gewindebüchsen dreh- und axialverstellbar geführt sind, wobei die Gewindebüchsen an ihren Innenseiten mit auf den Zugankern aufgebrachten Vielkeilprofilen korrespondieren und die Zuganker zur gegensinnigen Verstellung der mit ihren Stirnseiten auf die Gewindehälften im Sinne einer Aufeinanderzu- bzw. Voneinanderwegbewegung wirkenden Gewindebüchsen drehbar gelagert sind und mindestens ein Einde des Zugankers mit einer Kolben-Zylinder-Einheit zusammenwirkt, mit der die Vorspannkraft des Gerüstes aufbringbar ist. Durch diesen Vorschlag läßt sich sowohl die Anstellung der Gerüsthälften gegeneinander als auch die Vorspannung über die Zuganker verwirklichen.In a favorable embodiment of the invention it is proposed that the bores of the middle frame are provided in the region of their ends facing the scaffold halves with threads of different pitch directions, in which threaded bushes provided with a corresponding external thread are rotatably and axially adjustable, with the threaded bushes on the inside of them the multi-wedge profiles applied to the tie rods correspond and the tie rods for the opposite adjustment of the threaded bushes acting with their end faces on the thread halves in the sense of a movement towards or away from each other are rotatably mounted and at least one joint of the tie rod interacts with a piston-cylinder unit, with which the prestressing force of the scaffold can be applied. This proposal allows both the setting of the scaffold halves against each other and the prestressing via the tie rods.

Der Verstellmechanismus zum synchron gegenläufigen Verdrehen der Ständerhälften stützt sich nach einem weiteren Merkmal der Erfindung am Fundament des Walzgerüstes und/oder am Mittelrahmen ab. Die Verstellung kann durch synchron arbeitende Kolben-Zylinder-Einheiten, Getriebe oder gegenläufige Exzenter erfolgen.According to a further feature of the invention, the adjustment mechanism for synchronously rotating the stator halves is supported on the foundation of the roll stand and / or on the middle frame. The adjustment can be carried out by synchronously operating piston-cylinder units, gears or counter-rotating eccentrics.

In günstiger Ausgestaltung der Erfindung wird vorgeschlagen, daß der Mittelrahmen die bekannten Führungen für das Walzgut wie Ein- und Ausführungen, Seitenführungen, Schwenkarme für Diescherscheiben oder dergleichen aufnimmt. Diese Teile können ortsfest zusammen mit dem Mittelrahmen verbleiben, wenn die Walzen gewechselt werden müssen.In a favorable embodiment of the invention, it is proposed that the middle frame accommodate the known guides for the rolling stock, such as inserts and versions, side guides, swivel arms for washer disks or the like. These parts can remain stationary together with the middle frame if the rollers have to be changed.

Letzteres erfolgt nach einem günstigen Merkmal der Erfindung nach Lösen der Verbindung der Ständerhälften dadurch, daß mindestens eine der Walzen und deren Einbaustücke zusammen mit der jeweiligen Ständerhälfte ausbaubar ist. Auf diese Weise kann die ausgebaute Ständerhälfte schnellstmöglich gegen eine bereits vorbereitete andere Ständerhälfte ausgewechselt werden, nachdem zuvor das zweite Einbaustück mit der Gegenwalze gegen eine andere ausgewechselt wurde.The latter is done according to a favorable feature of the invention after loosening the connection of the stator halves in that at least one of the rollers and their chocks can be removed together with the respective stator half. In this way, the dismantled stand half can be replaced as quickly as possible with another stand half that has already been prepared, after the second chock with the counter roller has been replaced with another.

Nach einer besonders günstigen Ausgestaltung der Erfindung wird vorgeschlagen, zum Ausbau der Walzen die Einbaustücke beider Walzen miteinander zu verbinden und beide Walzen und deren Einbaustücke zusammen mit einer Ständerhälfte auszubauen. Dadurch läßt sich die Wechselzeit weiter verkürzen. Selbstverständlich kann auch das gesamte Gerüst gewechselt werden.According to a particularly favorable embodiment of the invention, it is proposed to connect the chocks of the two rolls to one another in order to remove the rolls and to remove both rolls and their chocks together with a stand half. This further shortens the changeover time. Of course, the entire scaffolding can also be changed.

Die Trennebene zwischen den Ständerhälften kann sowohl horizontal als auch vertikal verlaufen.The parting plane between the stand halves can run both horizontally and vertically.

Mit der vorliegenden Erfindung wird nicht nur ein in der Höhe und im Gewicht reduziertes Zweiwalzenschrägwalzwerk geschaffen, sondern auch die Dehnung unter Walzkreaft wird erheblich vermindert. Durch Verringerung der Walzenwechelzeiten infolge der einfachen konstruktiven Ausbildung des vorgeschlagenen Walzwerkes lassen sich, zusammen mit den anderen Merkmalen der Erfindung bessere Wanddickentoleranzen beim Herstellen von Rohren erzielen, sowie das Ausbringen des Walzwerkes dadurch verbessern, daß die Totzeiten beim Walzenwechsel verringert werden.With the present invention, not only is a two-roll cross-rolling mill reduced in height and weight, but also the elongation under rolling is considerably reduced. By reducing the roll change times due to the simple design of the proposed rolling mill, together with the other features of the invention, better wall thickness tolerances can be achieved in the manufacture of pipes, and the output of the rolling mill can be improved by reducing the idle times when changing the rolls.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend beschrieben. Es zeigt:

Fig. 1
ein erfindungsgemäßes Zweiwalzenschrägwalzwerk in der Seitenansicht,
Fig. 2
eine Draufsicht auf das Walzwerk nach Fig. 1,
Fig. 3
einen Schnitt durch das Walzgerüst im Bereich eines Zugankers,
Fig. 4
eine Ansicht des erfindungsgemäßen Walzwerkes in Walzrichtung und
Fig. 5
eine Gerüsthälfte mit Walzensatz im Ausbauzustand.

An embodiment of the invention is shown in the drawing and is described below. It shows:
Fig. 1
an inventive two-roll cross-rolling mill in side view,
Fig. 2
1 shows a plan view of the rolling mill according to FIG. 1,
Fig. 3
a section through the roll stand in the area of a tie rod,
Fig. 4
a view of the rolling mill according to the invention in the rolling direction and
Fig. 5
one half of the stand with a set of rollers in the dismantled state.

In Fig. 1 ist mit 1 der mit dem Fundament 7 verbundene Mittelrahmen bezeichnet, der die obere Ständerhälfte 2 und die untere Ständerhälfte 3 des erfindungsgemäßen Zweiwalzenschrägwalzwerkes trägt. Die Walzen sind mit 4 (Oberwalze) und 5 (Unterwalze) bezeichnet, 6 beziffert eine der beiden Führungsscheiben, die mittels bekannter Schwenkarme am Mittelrahmen 1 gelagert sind. Die Walzachse ist in Fig. 1 bei 8 angedeutet. Die obere Ständerhälfte 2 und die untere Ständerhälfte 3 sind mit Hilfe von Zugankern 9, von denen vier Stück beidseitig der Walzgutachse vorgesehen sind, ggfs. unter Vorspannung, zusammengehalten.In Fig. 1, 1 denotes the central frame connected to the foundation 7, which carries the upper stand half 2 and the lower stand half 3 of the two-roll cross-rolling mill according to the invention. The rollers are designated 4 (top roller) and 5 (bottom roller), 6 numbers one of the two guide disks which are mounted on the middle frame 1 by means of known swivel arms. The rolling axis is indicated at 8 in FIG. 1. The upper stand half 2 and the lower stand half 3 are held together with the aid of tie rods 9, four of which are provided on both sides of the rolling stock axis, possibly under tension.

Wie in Fig. 2 in der Draufsicht erkennbar, umfassen die Ständerhälften 2, 3 mit entsprechend größer ausgebildeten und einseitig offenen Bohrungen die Zuganker 9, und gestatten ein Verdrehen der Ständerhälften 2 und 3 im jeweils entgegengesetzten Sinne um die gemeinsame Achse A-A. Die einseitig offenen Bohrungen für die Zuganker in der oberen Ständerhälfte gestatten nach vorherigem Entspannen der Zuganker und Drehen der Ständerhälften auf 0 Grad Vorschubwinkel einen Ausbau derselben ohne Demontage weiterer Teile. Die Anstellgetriebe 16 sind hierbei in der unteren Ständerhälfte vorgesehen. Da in den jeweiligen Ständerhälften die Walzen 4 bzw. 5 in Einbaustücken 23, 24 bekannter Art gelagert sind, werden die Walzen durch Verdrehen der Ständerhälften verstellt. Dies kann nach Lösen der während des Walzbetriebes aufrecht erhaltenen Vorspannkraft mit Hilfe der bei 11 dargestellten Schwenkantriebe erfolgen, die sich am Mittelrahmen 1 abstützend, die obere Ständerhälfte in der einen und die untere Ständerhälfte in der anderen Richtung gegenüber dem feststehenden Mittelrahmen verdrehen.As can be seen in FIG. 2 in the top view, the stand halves 2, 3, with correspondingly larger bores that are open on one side, enclose the tie rods 9, and allow the stand halves 2 and 3 to be rotated in the opposite sense about the common axis A-A. The open holes on one side for the tie rods in the upper half of the stand allow the tie rods to be relaxed beforehand and the stand halves to be rotated to a 0-degree feed angle without removing any other parts. The adjusting gear 16 are provided in the lower half of the stand. Since the rollers 4 and 5 are mounted in chocks 23, 24 of known type in the respective stator halves, the rollers are adjusted by rotating the stator halves. This can be done after releasing the pre-tensioning force maintained during the rolling operation with the help of the swivel drives shown at 11, which are supported on the middle frame 1, twist the upper stand half in one direction and the lower stand half in the other direction with respect to the fixed middle frame.

Zur Anstellung der Walzen in Vertikalrichtung ist eine Konstruktion vorgesehen, wie sie in Fig. 3 dargestellt ist. Der Zuganker 9 durchdringt die obere und untere Ständerhälfte 2 und 3 sowie den Mittelrahmen 1. Im Bereich der Bohrung 12 im Mittelrahmen und zwar an deren Enden sind innerhalb des Mittelrahmens 1 Muttern 13 eingesetzt, die mit gleichen, aber gegensinnigen Innengewinden versehen sind. Innerhalb dieser Muttern 13 bewegen sich Gewindebüchsen 14 ― infolge der unterschiedlichen Gewindesteigungen gegensinnig, wenn diese gedreht werden. Im Bereich des axialen Bewegungsweges der Gewindebüchsen sind Vielkeilwellenprofile 15 auf dem Zuganker 9, so daß eine Axialbewegung der Gewindebüchsen 14 durch Verdrehen des Zugankers herbeigeführt werden kann. Zum Drehen des Zugankers dient ein Antriebsmotor 16 an einem Zugankerende; das andere Zugankerende 17 ist als Widerlager des Zugankers ausgebildet.A construction as shown in FIG. 3 is provided for adjusting the rollers in the vertical direction. The tie rod 9 penetrates the upper and lower stator halves 2 and 3 and the middle frame 1. In the area of the bore 12 in the middle frame, specifically on the latter Ends are inserted within the middle frame 1 nuts 13, which are provided with the same but opposite internal threads. Within these nuts 13, threaded bushings 14 move in opposite directions due to the different thread pitches when they are turned. In the area of the axial movement path of the threaded bushes there are splined profiles 15 on the tie rod 9, so that an axial movement of the threaded bushes 14 can be brought about by turning the tie rod. A drive motor 16 at one end of the tie rod serves to rotate the tie rod; the other tie rod end 17 is designed as an abutment of the tie rod.

An dem im Antriebsmotor 16 benachbarten Ende des Zugankers 9 ist zum Aufbringen von Vorspannkräften ein Hydraulikkolben 17 vorgesehen, der mit dem Hydraulikzylinder 18 zusammenwirkt und bei Beaufschlagung mit Druckmittel eine Zugkraft auf den Zuganker 9 aufbringt, um die Gerüsthälften 2 und 3 gegeneinander zu verspannen.At the adjacent end of the tie rod 9 in the drive motor 16, a hydraulic piston 17 is provided for applying prestressing forces, which cooperates with the hydraulic cylinder 18 and, when pressurized with pressure medium, applies a tensile force to the tie rod 9 in order to brace the frame halves 2 and 3 against one another.

Die Verstellung der Gerüsthälften 2 und 3 gegeneinander erfolgt, wie nachfolgend beschrieben:The scaffolding halves 2 and 3 are adjusted against each other as described below:

Durch Entlasten des Hydraulikzylinders 18 vom Druckmedium wird der Zuganker entspannt. Dieser kann jetzt über den Antriebsmotor 16 verdreht werden, wobei die Gewindebüchsen 14 über das Vielkeilwellenprofil 15 gedreht und dabei in Axialrichtung bewegt werden. Die Gewindebüchsen 14 drücken dabei mit ihren Stirnseiten gegen Stützringe 19, die wiederum die Gerüsthälften 2 und 3 auseinanderdrücken. Dabei wird über eine Gewindebüchse 20 und entsprechende Gewinde das obere Ende des Zugankers gehalten, damit die untere Ständerhälfte 3 infolge ihres Eigengewichtes nicht herunterfällt.By relieving the pressure on the hydraulic cylinder 18, the tie rod is relaxed. This can now be rotated via the drive motor 16, the threaded bushings 14 being rotated via the splined shaft profile 15 and being moved in the axial direction. The threaded bushes 14 press with their end faces against support rings 19, which in turn press the frame halves 2 and 3 apart. The upper end of the tie rod is held by a threaded bushing 20 and corresponding thread, so that the lower stand half 3 does not fall down due to its own weight.

Nachdem durch Verdrehen des Zugankers und Axialverschieben der Gewindebüchsen 14 das gewünschte Anstellmaß erreicht ist, wird erneut Druck auf den Hydraulikzylinder 18 aufgebracht und das Gerüst mit der gewünschten Vorspannkraft vorgespannt.After the desired adjustment dimension has been reached by rotating the tie rod and axially displacing the threaded bushes 14, pressure is again applied to the hydraulic cylinder 18 and the frame is prestressed with the desired prestressing force.

Im entlasteten Zustand des Zugankers 9 lassen sich die in Figuren 1 und 2 erkennbaren Schwenkantriebe 11 für die Gerüsthälften betätigen, deren Bewegung nach Verspannen der Gerüsthälften während des Walzbetriebes blockiert ist.In the relieved state of the tie rod 9, the swivel drives 11 shown in FIGS. 1 and 2 can be actuated for the scaffold halves, the movement of which is blocked after the scaffold halves have been braced during the rolling operation.

In Figur 4 sind gleiche Teile gleich bezeichnet. Zusätzlich sind mit 21 die Antriebe für die Führungscheiben beziffert, die unterhalb des Gerüstes vorgesehen sind.In FIG. 4, the same parts are labeled identically. In addition, the drives for the guide disks, which are provided below the frame, are numbered 21.

In Figur 5 ist als Beispiel dargestellt, wie der Walzenausbau bei dem neuen Zweiwalzenschrägwalzwerk erfolgen kann. Nach Lösen der Zuganker 9, werden die Gerüsthälften 2 und 3 zweckmäßig auf einen Vorschubwinkel von 0 Grad eingestellt und die obere Gerüsthälfte 2 wird an ein Hebezeug angehängt und diese zusammen mit der oberen Walze 4 und der mittels eines Verbindungselementes 22 daran angehängten Unterwalze 5 nach oben aus der unteren Gerüsthälfte 3 und dem Mittelrahmen herausgezogen. Ein entsprechend vorbereiteter neuer Walzensatz kann auf die gleiche Weise eingesetzt werden, so daß die Gerüstwechselzeiten äußerst kurz und der Aufwand beim Gerüstwechsel gering gehalten zierden können.FIG. 5 shows an example of how the roll removal can take place in the new two-roll cross-rolling mill. After loosening the tie rods 9, the scaffold halves 2 and 3 are expediently set to a feed angle of 0 degrees and the upper scaffold half 2 is attached to a hoist and this together with the upper roller 4 and the lower roller 5 attached to it by means of a connecting element 22 upwards pulled out of the lower half of the scaffold 3 and the middle frame. A correspondingly prepared new set of rollers can be used in the same way, so that the stand change times can be extremely short and the effort involved in changing the stand can be kept low.

Claims (11)

1. Double roller cross-rolling mill for piercing and stretching solid and hollow blocks, in which the rollers (4, 5) are arranged adjustably in the roller stand (2, 3),
characterised in that the roller stand is divided into two stand halves (2, 3) which are detachably linked to each other, each supporting one roller (4, 5) and if necessary its chocks (23, 24), and the stand halves (2, 3) are pivotable about a common axis (A-A) which intersects the axis of the rolling stock (8) at right-angles in order to adjust the angle of advance of the rollers (4, 5) with respect to each other.
2. Double roller cross-rolling mill according to Claim 1,
characterised in that a fixed central frame (1) which is connected to the pedestal (7) is provided between the stand halves (2, 3) which can be pivoted with respect to each other.
3. Double roller cross-rolling mill according to Claims 1 and 2,
characterised in that the stand halves (2, 3) are connected by means of prestressed tie rods (9) which penetrate the stand halves (2, 3) on both sides of the axis of the rolling stock (8), with a lateral play permitting turning of the stand halves (2, 3) about the common axis (A-A) being present between the tie rods and the bores (10) in the stand halves (2, 3) which are penetrated thereby.
4. Double roller cross-rolling mill according to Claims 1 and 3,
characterised in that the tie rods (9) which penetrate and connect the stand halves (2, 3) are designed as stay bolts which are attached to the central frame (1) on both sides.
5. Double roller cross-rolling mill according to Claim 2, 3 or 4,
characterised in that the tie rods (9) penetrating the central frame (1) are rotatably mounted therein and are provided on both ends in the region of the bores (10) of each stand half which are penetrated thereby with threads having different directions of pitch, and adjusting nuts with a corresponding counter-thread are located in the stand halves (2, 3).
6. Double roller cross-rolling mill according to Claim 3,
characterised in that the bores (10) of the central frame (1) are provided in the region of their ends facing the stand halves (2, 3) with threads (nuts 13) having different directions of pitch, in which threads threaded bushings (14) provided with corresponding external threads are guided to be rotationally and axially adjustable, the threaded bushings (14) corresponding on their insides to splines (15) formed on the tie rods (9) and the tie rods (9) being rotationally mounted for adjustment in the opposite direction of the threaded bushings (14) acting with their ends on the stand halves (2, 3) in the manner of a movement towards or away from each other, and at least one end of each tie rod (9) cooperating with a piston-cylinder unit (17, 18) with which the prestressing force of the stand can be applied.
7. Double roller cross-rolling mill according to Claim 1 or 2,
characterised in that an adjustment mechanism (11) for the synchronous turning of the stand halves (2, 3) in opposite directions is supported on the pedestal (7) of the roller stand and/or on the central frame (1).
8. Double roller cross-rolling mill according to Claim 2,
characterised in that the central frame (1) supports the known guides for the rolling stock, such as leading-in and leading-out guides, lateral guides, pivot arms for Diescher discs (6) or the like.
9. Double roller cross-rolling mill according to Claims 1 to 6,
characterised in that once the connection of the stand halves has been loosened, at least one of the rollers (4 or 5) and the chocks (23 or 24) thereof can be dismantled, together with the relevant stand half (2, 3).
10. Double roller cross-rolling mill according to Claim 9,
characterised in that in order to dismantle the rollers (4, 5) the chocks (23, 24) of both rollers can be connected together (22) and both rollers (4, 5) and their chocks (23, 24) can be dismantled together with one stand half (2).
11. Double roller cross-rolling mill according to one or more of the preceding Claims,
characterised in that the plane of separation between the stand halves (2, 3) is horizontal or vertical.
EP88900345A 1986-12-23 1987-12-21 Double roller crossrolling mill for piercing and stretching solid and hollow blocks Expired - Lifetime EP0339033B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88900345T ATE65435T1 (en) 1986-12-23 1987-12-21 TWO ROLL CROSS ROLLING MILL FOR PULLING AND STRETCHING SOLID AND HOLLOW BLOCKS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863644783 DE3644783A1 (en) 1986-12-23 1986-12-23 TWO-ROLLER INCLINATION ROLLER FOR HOLING AND STRETCHING SOLID AND HOLLOW BLOCKS
DE3644783 1986-12-23

Publications (2)

Publication Number Publication Date
EP0339033A1 EP0339033A1 (en) 1989-11-02
EP0339033B1 true EP0339033B1 (en) 1991-07-24

Family

ID=6317416

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88900345A Expired - Lifetime EP0339033B1 (en) 1986-12-23 1987-12-21 Double roller crossrolling mill for piercing and stretching solid and hollow blocks

Country Status (5)

Country Link
US (1) US4976127A (en)
EP (1) EP0339033B1 (en)
JP (2) JPH0722765B2 (en)
DE (2) DE3644783A1 (en)
WO (1) WO1988004583A1 (en)

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EP2602031B1 (en) 2011-12-09 2015-05-20 SMS Meer GmbH Cone piercing mill for producing seamless tubes
PL234617B1 (en) * 2018-04-09 2020-03-31 Lubelska Polt Device for shredding of the structure with the fixed guides

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Also Published As

Publication number Publication date
WO1988004583A1 (en) 1988-06-30
JPS63502121A (en) 1988-08-18
US4976127A (en) 1990-12-11
DE3644783A1 (en) 1988-07-07
EP0339033A1 (en) 1989-11-02
DE3771732D1 (en) 1991-08-29
JPH0722765B2 (en) 1995-03-15
JPH02501992A (en) 1990-07-05
DE3644783C2 (en) 1990-04-19

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