EP0423159A1 - Method and arrangement for reducing the outer diameter and wall thickness of an essentially cylindrical hollow rough-pierced tube blank by rolling. - Google Patents

Method and arrangement for reducing the outer diameter and wall thickness of an essentially cylindrical hollow rough-pierced tube blank by rolling.

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Publication number
EP0423159A1
EP0423159A1 EP89907063A EP89907063A EP0423159A1 EP 0423159 A1 EP0423159 A1 EP 0423159A1 EP 89907063 A EP89907063 A EP 89907063A EP 89907063 A EP89907063 A EP 89907063A EP 0423159 A1 EP0423159 A1 EP 0423159A1
Authority
EP
European Patent Office
Prior art keywords
tube blank
end part
reduced
rolling
wall thickness
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
EP89907063A
Other languages
German (de)
French (fr)
Other versions
EP0423159B1 (en
Inventor
Gustav-Adolf Pettersson
Ernst Zimmert
Bengt Jagaeus
Aake Sandberg
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0423159A1 publication Critical patent/EP0423159A1/en
Application granted granted Critical
Publication of EP0423159B1 publication Critical patent/EP0423159B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/12—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 parallel to the axis of the work
    • B21B19/16—Rolling tubes without additional rollers arranged inside the tubes
    • 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 of reducing the outer diameter and the wall thickness of a mainly cylindrical, hollow tube blank, the front end of which is inserted into a rolling mill.
  • the diameter and wall thickness of a hollow tube blank are reduced at a temperature of approximately 1000 ° C.
  • the reduction is carried out in a rolling mill with the aid of outer rolls which are arranged symmetrically around the pipe axis, an inner mandrel being introduced into the pipe blank.
  • the material flows and, due to the reducing forces and the rolling geometry, has a tendency to expand when it comes into the reduction zone.
  • the expansion of the tube blank is usually prevented by the rear material.
  • the funnel When rolling the end part of thin-walled pipes (outside diameter / wall thickness about 10), however, the remaining amount of material is insufficient to prevent the pipe from expanding, so that the end part is expanded so that the pipe gets stuck or the rolls slide against the pipe and one remains funnel-shaped triangular end part at the tube.
  • the funnel creates many problems. It means that you have to use lower feed speeds (smaller feed angles) and that you cannot manufacture any thin-walled tube.
  • the tubes can also get stuck in subsequent work stages or during intermediate transport due to the funnel. If a pipe gets stuck, which often requires time-consuming and expensive disassembly and assembly,
  • the funnel continues to put great stress on the rollers and transmissions, with the result that even rollers can tear and clutches and gears can break.
  • Another disadvantage is that the test measurement of the pipes, which takes place at the end part of the pipes, is difficult.
  • Fig. 1 is a schematic diagram for the hot rolling of
  • Fig. 3 shows schematically an arrangement for the on-line
  • Fig. 4 shows an end part of a tube blank obtained by the method according to the invention.
  • Figure 1 shows how the hot rolling of a tube blank normally takes place in an Assel mill.
  • An elongated mandrel 5 is inserted into a hollow tube blank 1, which has been heated to approximately 1000 ° C.
  • the tube blank provided with the mandrel is then inserted into the pull-in part 3 between rollers 2a, 2b, 2c of the rolling mill and is pushed onto the shoulder 4, which is characteristic of an Assel rolling mill, where the reduction is carried out, after which the reduced tube is passed through the grinding part 6 where that Pipe gets its final shape, is moved. Due to the friction between the rollers 2a, 2b, 2c and
  • Tube 1 rotates tube 1 simultaneously with the feed. Due to the relative speed differences in the tube blank 1 between its outside, which is influenced by the rollers 2a, 2b, 2c, and its inside, which bears against the mandrel 5, a so-called triangle-like loop is created in the reduction zone, see Figure 2.
  • the diameter and / or the wall thickness of the end part of the tube is reduced before this part is introduced into the reduction zone.
  • the pre-reduction can be carried out at any time before the main reduction in the Assel rolling mill and with any suitable method, for example by plastic processing methods such as forging or rolling or by cutting processing, for example turning.
  • a suitable arrangement to achieve the desired pre-reduction on-line is on
  • the tube blank 1 passes freely through the pre-reduction rollers, but when an end part of the tube blank 1 gets between the rollers, the force device is activated so that the rollers are pressed against the tube blank, so that the wall thickness 1 when the tube blank 1 is moved further and the diameter is reduced, and the end part is given the appearance shown in Figure 4.
  • the power device can be activated manually, but preferably the pre-reduction mill includes a sensing arrangement located at a suitable distance, e.g. by means of a
  • Photocell which senses the passage of the end part and gives a signal, whereby the arms 8a, 8b and the pre-reduction rollers are pressed against the tube blank.
  • the hinge 9 is arranged on a pin 10, which can be placed in a corresponding hole in the frame of the Assel mill. This avoids the construction of a special and expensive frame for the reduction rollers.
  • the embodiment relates to the hot rolling of pipes in an Assel mill, but it is clear that the method described can also be used in other mills where similar problems occur.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
  • Forging (AREA)

Abstract

Dans le procédé décrit, l'extrémité antérieure de l'ébauche de tube est introduite dans un laminoir. Pour éviter la formation de retassures lors du laminage et pour éliminer les inconvénients existants jusqu'à présent, il est proposé de réduire le diamètre et/ou l'épaisseur de paroi de la partie terminale de l'ébauche de tube avant d'introduire ladite partie terminale dans la zone de réduction du laminoir.In the method described, the front end of the tube blank is introduced into a rolling mill. To avoid the formation of shrinkage during rolling and to eliminate the drawbacks existing until now, it is proposed to reduce the diameter and / or the wall thickness of the end part of the tube blank before introducing said tube blank. end part in the reduction zone of the rolling mill.

Description

Methode und Anordnung durch Walzen  Method and arrangement by rolling
den Außendurchmesser und die Wanddicke einer hauptsächlich zylindrisch gehöhlten Rohrluppe zu reduzieren.  to reduce the outside diameter and the wall thickness of a mainly cylindrical hollow tube.
Die Erfindung betrifft ein Verfahren, durch Walzen den Außendurchmesser und die Wanddicke einer hauptsächlich zylindrischen, hohlen Rohrluppe zu reduzieren, deren vorderes Ende in ein Walzwerk eingeführt wird. The invention relates to a method of reducing the outer diameter and the wall thickness of a mainly cylindrical, hollow tube blank, the front end of which is inserted into a rolling mill.
Beim Warmwalzen eines Stahlrohres werden der Durchmesser und die Wanddicke einer hohlen Rohrluppe bei einer Temperatur von etwa 1000° C reduziert. Die Reduktion wird in einem Walzwerk mit Hilfe von äußeren Walzen vorgenommen, die symmetrisch um die Rohrachse angeordnet sind, wobei ein innerer Dorn -in die Rohrluppe eingeführt wird. Während des Walzens fließt das Material und erhält auf Grund der Reduktionskräfte und der Walzgeometrie eine Tendenz zur Ausdehnung, wenn es in die Reduktionszone hineinkommt. Die Ausdehnung der Rohrluppe wird normalerweise durch das hintere Material verhindert. Beim Walzen des Endteils dünnwandiger Rohre (Außendurchmesser/Wanddicke etwa 10 ) ist aber die restliche Materialmenge ungenügend um die Ausdehnung des Rohres zu verhindern, wodurch der Endteil so ausgedehnt wird, daß das Rohr stecken bleibt oder die Walzen gegen das Rohr gleiten und man einen verbleibenden trichterförmigen triangulären Endteil beim Rohr bekommt. Außer einer Verminderung der Ausbeute (der Trichter muß abgeschnitten werden) schafft der Trichter viele Probleme. Er bringt nämlich mit sich, daß man niedrigere Vorschubgeschwindigkeiten (-kleineren Vorschubwinkel) anwenden muß und daß man nicht jedes beliebige dünnwandige Rohr herstellen kann. Die Rohre können auch in nachfolgenden Arbeitsstufen oder bei zwischenliegenden Transporten infolge des Trichters stecken bleiben. Wenn ein Rohr stecken bleibt, was oft eine zeitraubende und kostspielige Demontage und Montage erfordert, When a steel tube is hot rolled, the diameter and wall thickness of a hollow tube blank are reduced at a temperature of approximately 1000 ° C. The reduction is carried out in a rolling mill with the aid of outer rolls which are arranged symmetrically around the pipe axis, an inner mandrel being introduced into the pipe blank. During rolling, the material flows and, due to the reducing forces and the rolling geometry, has a tendency to expand when it comes into the reduction zone. The expansion of the tube blank is usually prevented by the rear material. When rolling the end part of thin-walled pipes (outside diameter / wall thickness about 10), however, the remaining amount of material is insufficient to prevent the pipe from expanding, so that the end part is expanded so that the pipe gets stuck or the rolls slide against the pipe and one remains funnel-shaped triangular end part at the tube. In addition to reducing the yield (the funnel must be cut off), the funnel creates many problems. It means that you have to use lower feed speeds (smaller feed angles) and that you cannot manufacture any thin-walled tube. The tubes can also get stuck in subsequent work stages or during intermediate transport due to the funnel. If a pipe gets stuck, which often requires time-consuming and expensive disassembly and assembly,
müssen auch auf der Linie nachfolgende Rohre verschrotte werden, weil diese dann zu sehr abkühlen und in späteren Arbeitsstufen nicht verwendet werden können. subsequent pipes must also be scrapped on the line, because these then cool down too much and cannot be used in later work stages.
Der Trichter bewirkt weiterhin große Beanspruchungen der Walzen und Transmissionen, was zur Folge hat, daß sogar Walzen reißen und Kupplungen und Getriebe brechen können. Ein weiterer Nachteil ist, daß die Prüfmessung der Rohre, die am Endteil der Rohre geschieht, erschwert wird. The funnel continues to put great stress on the rollers and transmissions, with the result that even rollers can tear and clutches and gears can break. Another disadvantage is that the test measurement of the pipes, which takes place at the end part of the pipes, is difficult.
Es ist also wünschenswert, daß man beim Walzen diese Trichterbildung vermeidet und dadurch die oben genannten Nachteile eliminiert und eine höhere Betriebsleistung erhält. It is therefore desirable that this funnel formation be avoided during rolling and thereby eliminate the disadvantages mentioned above and obtain a higher operating performance.
Gemäß der Erfindung wird dies dadurch erreicht, daß der Endteil der Rohrluppe vorreduziert wird, ehe der Endteil in das Walzwerk eingeführt wird. Eine nähere Beschreibung des Verfahrens gemäß der Erfindung und der damit hergestellten Rohrluppen, sowie der Anordnung erfolgt unter Bezug auf die beigefügten Zeichnungen. According to the invention, this is achieved in that the end part of the tube blank is pre-reduced before the end part is introduced into the rolling mill. A more detailed description of the method according to the invention and the tube blanks produced therewith, as well as the arrangement is given with reference to the accompanying drawings.
Dabei zeigt: It shows:
Fig. 1 eine Prinzipskizze für das Warmwalzen von Fig. 1 is a schematic diagram for the hot rolling of
Rohren in einem sogenannten Assel-Walzwerk;  Pipes in a so-called woodlouse mill;
Fig. 2 die sogenannte Schiingenbildung, die beim Fig. 2, the so-called loop formation, which at
Walzen in einem Assel-Walzwerk entsteht;  Rolling occurs in an Assel rolling mill;
Fig. 3 schematisch eine Anordnung für die on-line Fig. 3 shows schematically an arrangement for the on-line
Reduktion des Endteils einer Rohrluppe und  Reduction of the end part of a pipe blank and
Fig. 4 einen durch das Verfahren gemäß der Erfindung erhaltenen Endteil einer Rohrluppe. Fig. 4 shows an end part of a tube blank obtained by the method according to the invention.
Aus dem Bild 1 geht hervor, wie das Warmwalzen einer Rohrluppe in einem Assel-Walzwerk normalerweise vor sich geht. In eine hohle Rohrluppe 1, die auf etwa 1000°C erwärmt worden ist, wird ein langgestreckter Dorn 5 eingeführt. Die mit dem Dorn versehene Rohrluppe wird danach in den Einzugsteil 3 zwischen Walzen 2a, 2b, 2c des Walzwerkes eingeführt und wird an die für ein Assel-Walzwerk charakteristische Schulter 4 geschoben, wo die Reduktion durchgeführt wird, wonach das reduzierte Rohr durch den Schleifteil 6, wo das Rohr seine endgültige Form erhält, bewegt wird. Infolge der Reibung zwischen den Walzen 2a, 2b, 2c und dem Figure 1 shows how the hot rolling of a tube blank normally takes place in an Assel mill. An elongated mandrel 5 is inserted into a hollow tube blank 1, which has been heated to approximately 1000 ° C. The tube blank provided with the mandrel is then inserted into the pull-in part 3 between rollers 2a, 2b, 2c of the rolling mill and is pushed onto the shoulder 4, which is characteristic of an Assel rolling mill, where the reduction is carried out, after which the reduced tube is passed through the grinding part 6 where that Pipe gets its final shape, is moved. Due to the friction between the rollers 2a, 2b, 2c and
Rohr 1 rotiert das Rohr 1 gleichzeitig mit dem Vorschub. Aufgrund der relativen Geschwindigkeitsdifferenzen in der Rohrluppe 1 zwischen ihrer von den Walzen 2a, 2b, 2c beeinflußten Außenseite und ihrer gegen den Dorn 5 anliegenden Innenseite entsteht eine dreieckähnliche sogenannte Schlinge in der Reduktionszone, siehe Bild 2. Tube 1 rotates tube 1 simultaneously with the feed. Due to the relative speed differences in the tube blank 1 between its outside, which is influenced by the rollers 2a, 2b, 2c, and its inside, which bears against the mandrel 5, a so-called triangle-like loop is created in the reduction zone, see Figure 2.
Der Schiingenbildung wird von dem dahinter liegenden, nicht reduzierten Material entgegengewirkt. Beim End- teil der Rohrluppe, wo besonders bei dünnwandigen Rohren die Materialmenge gering ist, ist dieser hemmende The formation of loops is counteracted by the underlying, non-reduced material. In the end part of the tube blank, where the amount of material is small, particularly in the case of thin-walled tubes, this is inhibitory
Effekt vermindert und die Schlinge kann sich ziemlich kräftig ausdehnen, was entweder mit sich bringt, daß das Rohr stecken bleibt, oder daß Gleitreibung zwischen den Walzen 2a, 2b, 2c und dem Rohr 1 während des Vorschubes, auftritt, wodurch das Rohr 1 einen ausgedehnten Endteil mit hauptsächlich triangulärer Form erhält.  The effect is reduced and the loop can expand quite vigorously, which either means that the tube gets stuck or that sliding friction occurs between the rollers 2a, 2b, 2c and the tube 1 during the advance, which gives the tube 1 an extended Main part with a mainly triangular shape.
Um diese Trichterbildung zu eliminieren, die die vorgenannten Nachteile herbeiführen kann, werden der In order to eliminate this funnel formation, which can bring about the aforementioned disadvantages, the
Durchmesser und/oder die Wanddicke des Endteiles des Rohres reduziert, ehe dieser Teil in die Reduktionszone eingeführt wird. Die Vorreduktion kann zu beliebiger Zeit vor der Hauptreduktion im Assel-Walzwerk ausgeführt werden und mit einer beliebigen geeigneten Methode, z.B. durch plastische Bearbeitungsmethoden, wie Schmieden oder Walzen oder durch schneidende Bearbeitung, z.B. Drehen. Eine geeignete Anordnung, um die gewünschte Vorreduktion on-line zustande zu bringen, wird auf The diameter and / or the wall thickness of the end part of the tube is reduced before this part is introduced into the reduction zone. The pre-reduction can be carried out at any time before the main reduction in the Assel rolling mill and with any suitable method, for example by plastic processing methods such as forging or rolling or by cutting processing, for example turning. A suitable arrangement to achieve the desired pre-reduction on-line is on
Bild 3 gezeigt. Vier Vorreduktionswalzen 7a, 7b, 7c, 7d sind selbstzentrierend um die Rohrluppe 1 herum nahe am Assel-Walzwerk angeordnet. Diese Vorreduktionswalzen sind paarweise angeordnet auf zwei rings um eine Achse 9 drehbaren Armen 8a, 8b, wobei das Gelenk 9 unter der Rohrluppe 1 und den Walzen angeordnet ist. Die Arme können mittels einer Kraftvorrichtung, vorzugsweise eines Hydraulikzylinders, gegen einander gedrückt werden, wodurch auch die Walzen 7a, 7b, 7c, 7d gegen einander und gegen die Rohrluppe 1 geführt werden. In der Normallage geht die Rohrluppe 1 frei durch die Vorreduktionswalzen hindurch, aber wenn ein Endteil der Rohrluppe 1 zwischen die Walzen gelangt, wird die Kraftvorrichtung aktiviert, so daß die Walzen gegen die Rohrluppe gedrückt werden, so daß bei weiterer Bewegung der Rohrluppe 1 die Wanddicke und der Durchmesser reduziert werden, und der Endteil das auf Bild 4 gezeigte Aussehen erhält. Die Kraftvorrichtung kann manuell aktiviert werden, aber vorzugsweise enthält das Vorreduktionswalzwerk eine Abfühlanordnung, die in einer geeigneten Entfernung, z.B. mittels einer Picture 3 shown. Four pre-reduction rollers 7a, 7b, 7c, 7d are self-centering around the tube blank 1 close to the Assel mill. These pre-reduction rollers are arranged in pairs on two arms 8a, 8b which can be rotated around an axis 9, the joint 9 being arranged under the tube blank 1 and the rollers. The arms can be pressed against each other by means of a force device, preferably a hydraulic cylinder, whereby the rollers 7a, 7b, 7c, 7d are also guided against each other and against the tube blank 1. In the normal position, the tube blank 1 passes freely through the pre-reduction rollers, but when an end part of the tube blank 1 gets between the rollers, the force device is activated so that the rollers are pressed against the tube blank, so that the wall thickness 1 when the tube blank 1 is moved further and the diameter is reduced, and the end part is given the appearance shown in Figure 4. The power device can be activated manually, but preferably the pre-reduction mill includes a sensing arrangement located at a suitable distance, e.g. by means of a
Fotozelle, den Durchgang des Endteils abfühlt und ein Signal gibt, wodurch die Arme 8a, 8b und die Vorreduktionswalzen gegen die Rohrluppe gedrückt werden. Das Gelenk 9 ist auf einem Zapfen 10 angeordnet, der in ein entsprechendes Loch im Gestell des Assel-Walzwerkes angebracht werden kann. Man vermeidet dadurch den Bau eines besonderen und teuren Gestells für die Reduktionswalzen. Photocell, which senses the passage of the end part and gives a signal, whereby the arms 8a, 8b and the pre-reduction rollers are pressed against the tube blank. The hinge 9 is arranged on a pin 10, which can be placed in a corresponding hole in the frame of the Assel mill. This avoids the construction of a special and expensive frame for the reduction rollers.
Man kann auch die Vorreduktion zustande bringen im One can also bring about the pre-reduction in
Zusammenhang damit, daß die Rohrluppe im Lochwalzwerk gelocht wird und zwar dadurch, daß man die Lage des Lochstopfens am Ende des Lochens ändert. Connection with the fact that the tube blank is perforated in the piercing mill, namely by changing the position of the perforated plug at the end of the perforation.
Das Ausführungsbeispiel bezieht sich allerdings auf das Warmwalzen von Rohren in einem Assel-Walzwerk, aber es ist klar, daß das beschriebene Verfahren auch bei anderweitigen Walzwerken, wo ähnliche Probleme auftreten, verwendet werden kann. However, the embodiment relates to the hot rolling of pipes in an Assel mill, but it is clear that the method described can also be used in other mills where similar problems occur.
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Claims

Patentansprüche Claims
1. Verfahren zur Reduzierung des Außendurchmessers 1. Procedure for reducing the outside diameter
und der Wanddicke einer hauptsächlich zylindrischen, hohlen Rohrluppe durch Walzen, die mit ihrem vorderen Teil in ein Walzwerk eingeführt wird, dadurch gekennzeichnet, daß der Durchmesser und/oder die Wanddicke des Endteils der Rohrluppe reduziert wird ehe der Endteil in die Reduktionszone des Walzwerkes eingeführt wird.  and the wall thickness of a mainly cylindrical, hollow tube blank by rolling, which is introduced with its front part into a rolling mill, characterized in that the diameter and / or the wall thickness of the end part of the tube blank is reduced before the end part is introduced into the reduction zone of the rolling mill .
2. Verfahren gemäß Anspruch 1, gekennzeichnet dadurch, daß der Endteil mittels plastischer Bearbeitung vorreduziert wird. 2. The method according to claim 1, characterized in that the end part is pre-reduced by means of plastic processing.
3. Verfahren gemäß Anspruch 2, gekennzeichnet dadurch, daß der Endteil mittels Walzung vorreduziert wird. 3. The method according to claim 2, characterized in that the end part is pre-reduced by rolling.
4. Verfahren gemäß Anspruch 3, gekennzeichnet dadurch, daß der Endteil mittels Schmieden vorreduziert wird. 4. The method according to claim 3, characterized in that the end part is pre-reduced by forging.
5. Verfahren gemäß Anspruch 1, gekennzeichnet dadurch, daß der Endteil mittels schneidender Bearbeitung vorreduziert wird. 5. The method according to claim 1, characterized in that the end part is pre-reduced by means of cutting processing.
6. Verfahren gemäß Anspruch 5, gekennzeichnet dadurch, daß der Endteil mittels Drehen vorreduziert wird. 6. The method according to claim 5, characterized in that the end part is pre-reduced by turning.
7. Hohle Rohrluppe mit hauptsächlich zylindrischer Form, deren Außendurchmesser und Wanddicke in einem Walzwerk reduziert wird, gekennzeichnet dadurch, daß das hintere Ende der Rohrluppe (1) einen kleineren Außendurchmesser und/oder eine kleinere Wanddicke als der Rest der hauptsächlich zylindrischen Rohrluppe aufweist. 7. Hollow tube blank with a mainly cylindrical shape, the outer diameter and wall thickness of which is reduced in a rolling mill, characterized in that the rear end of the tube blank (1) has a smaller outer diameter and / or a smaller wall thickness than the rest of the mainly cylindrical tube blank.
8. Anordnung zur Erzeugung eines vorreduzierten Endteils einer hohlen Rohrluppe, welche dafür vorgesehen ist, durch Walzen in einem Walzwerk einen reduzierten Außendurchmesser und eine reduzierte Wanddicke zu erhalten, dadurch gekennzeichnet, daß in der Längsvorschubrichtung der Rohrluppe vor dem Walzwerk gegen die Rohrluppe und von derselben führbare Vorreduktionswalzen (7a,7b, 7c,7d) angeordnet sind. 8. Arrangement for producing a pre-reduced end part of a hollow tube blank, which is intended to obtain a reduced outer diameter and a reduced wall thickness by rolling in a rolling mill, characterized in that in the longitudinal feed direction of the tube blank in front of the rolling mill against the tube blank and from the same feasible pre-reduction rollers (7a, 7b, 7c, 7d) are arranged.
9. Anordnung gemäß Anspruch 8, gekennzeichnet dadurch, daß die Walzen (7a, 7b, 7c,7d) symmetrisch rings um die Rohrluppe (1) angeordnet sind, und zwar auf zwei gegen die Rohrluppe mittels einer Kraftvorrichtung beweglichen Armen (8a,8b). 9. Arrangement according to claim 8, characterized in that the rollers (7a, 7b, 7c, 7d) are arranged symmetrically around the tube blank (1), namely on two arms (8a, 8b) movable against the tube blank by means of a force device. .
10. Anordnung gemäß Anspruch 9, gekennzeichnet dadurch, daß die Arme (8a,8b) in einem Gelenk drehbar gelagert sind. 10. The arrangement according to claim 9, characterized in that the arms (8a, 8b) are rotatably mounted in a joint.
11. Anordnung gemäß Ansprüche 9 oder 10, gekennzeichnet dadurch, daß die Kraftvorrichtung aus einem Hydraulikzylinder besteht mit deren Hilfe die Arme (8a,8b) gegen die Rohrluppe gedrückt werden können. 11. Arrangement according to claims 9 or 10, characterized in that the power device consists of a hydraulic cylinder with the help of which the arms (8a, 8b) can be pressed against the tube blank.
12. Anordnung gemäß Ansprüche 8 bis 11, gekennzeichnet dadurch, daß sie ein Abfühlorgan aufweist, welches den Durchgang des Endteils abfühlt und ein Signal gibt, wodurch die Vorreduktionswalzen (7a, 7b, 7c, 7d) gegen die Rohrluppe (l) gedrückt werden. 12. Arrangement according to claims 8 to 11, characterized in that it has a sensing element, which senses the passage of the end part and gives a signal, whereby the pre-reduction rollers (7a, 7b, 7c, 7d) are pressed against the tube blank (l).
13. Anordnung gemäß Ansprüche 8 bis 12, gekennzeichnet dadurch, daß sie fest an dem Walzengestell angeordnet ist. 13. Arrangement according to claims 8 to 12, characterized in that it is fixedly arranged on the roller frame.
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EP89907063A 1988-07-05 1989-06-16 Method and arrangement for reducing the outer diameter and wall thickness of an essentially cylindrical hollow rough-pierced tube blank by rolling Expired - Lifetime EP0423159B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3823135 1988-07-05
DE3823135A DE3823135C3 (en) 1988-07-05 1988-07-05 Method and arrangement to reduce the outer diameter and the wall thickness of a mainly cylindrical hollow tube blank by rolling
PCT/DE1989/000407 WO1990000449A1 (en) 1988-07-05 1989-06-16 Method and arrangement for reducing the outer diameter and wall thickness of an essentially cylindrical hollow rough-pierced tube blank by rolling

Publications (2)

Publication Number Publication Date
EP0423159A1 true EP0423159A1 (en) 1991-04-24
EP0423159B1 EP0423159B1 (en) 1996-07-24

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EP89907063A Expired - Lifetime EP0423159B1 (en) 1988-07-05 1989-06-16 Method and arrangement for reducing the outer diameter and wall thickness of an essentially cylindrical hollow rough-pierced tube blank by rolling

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Publication number Publication date
CS412589A2 (en) 1991-08-13
DE3823135C2 (en) 1991-04-25
CN1019276B (en) 1992-12-02
DE3823135C3 (en) 1995-05-04
US5125251A (en) 1992-06-30
DE58909706D1 (en) 1996-08-29
CN1039981A (en) 1990-02-28
ES2014170A6 (en) 1990-06-16
WO1990000449A1 (en) 1990-01-25
DE3823135A1 (en) 1990-01-11
EP0423159B1 (en) 1996-07-24

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