EP0353324B1 - Method for the straight drawing of tubes, and device for carrying out the method - Google Patents

Method for the straight drawing of tubes, and device for carrying out the method Download PDF

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Publication number
EP0353324B1
EP0353324B1 EP88112596A EP88112596A EP0353324B1 EP 0353324 B1 EP0353324 B1 EP 0353324B1 EP 88112596 A EP88112596 A EP 88112596A EP 88112596 A EP88112596 A EP 88112596A EP 0353324 B1 EP0353324 B1 EP 0353324B1
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EP
European Patent Office
Prior art keywords
mandrel
indentation
tube
indenting
workpiece
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
EP88112596A
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German (de)
French (fr)
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EP0353324A1 (en
Inventor
Karl-Heinz Komp
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.)
Schumag AG
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Schumag AG
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Filing date
Publication date
Application filed by Schumag AG filed Critical Schumag AG
Priority to EP88112596A priority Critical patent/EP0353324B1/en
Priority to DE8888112596T priority patent/DE3872231D1/en
Priority to JP63329531A priority patent/JPH0246910A/en
Priority to FI893420A priority patent/FI98132C/en
Priority to US07/387,861 priority patent/US4962658A/en
Publication of EP0353324A1 publication Critical patent/EP0353324A1/en
Application granted granted Critical
Publication of EP0353324B1 publication Critical patent/EP0353324B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/32—Feeding or discharging the material or mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
    • B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
    • B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
    • B21C1/24—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles by means of mandrels

Definitions

  • the invention relates to a device for performing the method.
  • This object is achieved according to the invention in a method of the type described in the introduction in that the desired number of mandrels is introduced independently of one another into the initial region of the tube before the start of drawing in such a way that it begins with the drawing between a drawing bar and one behind the last and largest mandrel Indentation introduced into the pipe are arranged, whereupon during the subsequent drawing process the remaining mandrels are transported further with the drawn part and in the area of the pipe wall thickness emerging from the respective drawing nozzle but reduced in thickness, but as close as possible behind the last mandrel, which is the preceding drawing nozzle happened, each further indentation is made.
  • the mandrels are no longer releasably connected to one another, but have no connection at all. They just lie loosely in the pipe in the right order one after the other. Then, in a manner known per se, except for the last largest mandrel, all the mandrels are transported through the largest drawing nozzle, whereupon the largest mandrel is pulled into the drawing position by the dent located behind it in the pipe, thereby reducing the pipe wall thickness in its drawing position. However, the mandrels preceding the largest mandrel no longer remain in an unchanged position relative to this largest mandrel during the drawing process, but rather move unhindered with the part which has undergone a change in diameter but no change in wall thickness.
  • the method according to the invention it is possible to pull a tube with a work result known per se, but to use simpler mandrels, to reduce the necessary hollow drawing length and to make space for an indentation device.
  • the last point in particular proves to be particularly important because the indentation device can now be designed in such a way that the actual indentation bolt can move with the surface movement of the workpiece in a suitable manner, so that on the one hand a standstill of the drawing process for introducing the dent is not necessary, on the other hand, the risk of cracking of the workpiece can be avoided in conventional detaching under pulling speed.
  • a tube 1 is shown schematically at the beginning of the drawing process.
  • a drawing bar 9 is formed, which has already been passed through the drawing nozzle 6.
  • the mandrels 2, 3 and 4 are inserted one after the other in the tube as completely loose and independent pieces.
  • An indentation 10 is provided behind the largest mandrel 2. The mandrels get smaller and smaller in the pulling direction.
  • tube 1 is now pulled in the direction of drawing 5 via the drawing bar 9, the mandrels 3 and 4 migrate unhindered through the drawing nozzle 6, while tube 1 is simultaneously reduced in its diameter but not in its wall thickness.
  • Straight pulling machines with intermittent pulling carriages 20 are well known and do not require further explanation here.
  • FIG. 7 the drawing nozzle 7 is shown schematically in a side view of such a straight-line drawing machine 19 with a start of the tube 1 with the drawing bar 9 that has already passed through the drawing nozzle 7.
  • the drawing slide 20 grips the drawing bar 9 and pulls the tube 1 in the drawing direction 5 through the drawing stroke 13 through the Drawing nozzle 7. This process is known and therefore need not be explained further here.
  • an indentation device 14 can be moved radially to the workpiece 1 in straight guides 23, displaceable by a drive device 24, designed as a hydraulic cylinder, in the direction of arrow 22.
  • This indentation device 14 has a lifting head 21 on the side facing the workpiece 1, on which Dell tools 15 and 16 are pivotally mounted on the side facing the workpiece 1 about the axes 25 and 26 running parallel to one another.
  • the swiveling movement can in this case be carried out by a swivel drive 30 designed as a hydraulic cylinder via a corresponding lever, which is connected to the swivel axis 25 and is not designated in any more detail.
  • a toothed ring segment 28 is provided on the upper side of the lifting head 21, which meshes with a toothed ring segment 29, which is connected to the swivel axis 26 in a rotationally fixed manner.
  • a pivoting movement of the ring gear segment 28 is thus transmitted in the opposite direction of rotation to the ring gear segment 29 and thus in each case to the Dell tools 15 and 16, which thus move in the opposite arrangement and in each case in the opposite direction of rotation.
  • the Dell tools 15 and 16 have dent pins 17 and 18 on their side facing the workpiece 1, which, when pivoted to such an extent that they lie on a straight line through the two pivot axes 25 and 26, have such a distance with their tips, which is smaller than the outer diameter of the workpiece 1 arriving there, so that they make a corresponding indentation on the workpiece 1 there.
  • FIGS. 9 to 11 the respective ring gear segment 28 or 29 is shown in FIGS. 9 to 11 as if it were arranged on the underside of the lifting head 21.
  • the ring gear segments 28 and 29 are preferably arranged on the top of the lifting head 21, as shown in FIG. 8 and thus invisible in FIGS. 8 to 11.
  • FIG. 7 shows no Dell tool 15 or 16 on the underside of the lifting head 21. The arrangement is clear from Figure 8 and Figures 9 to 11.
  • the denting device 14 has now been moved into the working position as described, the workpiece 1 and the Dell tools 15 and 16 assume a relative position to one another, as can be seen in FIG. 11.
  • the workpiece 1 is now moved in the direction of drawing 5 and at the same time the Dell tools 15 and 16 are pivoted by a corresponding actuation of the swivel drive 30 so that the dent bolts 17 and 18 have a peripheral speed which corresponds to the drawing speed of the workpiece 1 in the direction of drawing 5.
  • the dent pins 17 and 18 then move towards the surface of the workpiece 1 and thus dent the workpiece 1 in a position as shown in FIG. 10.
  • This arrangement according to FIG. 10 is shown in a different view in FIG. 8.
  • the indentation device or at least the lifting head of the indentation device can be moved in straight guides from a drive device towards and away from the workpiece.
  • This is a simple and armored construction that allows for accurate and rapid movement and positioning.
  • a pivoting movement of the lifting head would also be possible.
  • the ring gear segments with which the rotary movement of the Dell tools is coordinated, provide a simple means of ensuring that a correct sequence of movements of the indenting tools is achieved. At the same time, this eliminates the need for a second rotary actuator and the coordination measures that are then required.
  • the swivel drive itself can be made very weak because the indentation force can be generated by the retracting movement of the workpiece.
  • the invention is of course not limited to the use of three drawing nozzles but can just as well be carried out with more or fewer drawing nozzles.

Description

Die Erfindung betrifft ein Verfahren zum Geradeausziehen eines Rohres in mindestens zwei Stufen über eine der Anzahl der Ziehstufen entsprechende Anzahl vom im Innern des Rohres befindlicher Dorne, wobei jeder Dorn durch eine in Ziehrichtung vor der nächsten Ziehdüse aber hinter dem dieser Ziehdüse zugeordneten Dorn in das Rohr eingebrachte Eindellung in Ziehposition gebracht wird.The invention relates to a method for pulling a pipe straight in at least two stages over a number corresponding to the number of drawing stages of the mandrels located in the interior of the tube, each mandrel in the drawing direction in front of the next drawing nozzle but behind the mandrel assigned to this drawing nozzle into the tube indentation is brought into the pulling position.

Weiterhin betrifft die Erfindung eine Einrichtung zur Durchführung des Verfahrens.Furthermore, the invention relates to a device for performing the method.

Ein solches Verfahren und eine zur Durchführung dieses Verfahrens geeignete Einrichtung ist bereits bekannt geworden aus der DE-OS 26 23 385. Zur Durchführung dieses bekannten Verfahrens werden jedoch relativ kompliziert aufgebaute Dorne benötigt, die beispielsweise über Steckverbindungen oder ähnlich wirkende Verbindungen untereinander in Verbindung stehen müssen. Die Ausbildung dieser Verbindungsbereiche ist relativ kompliziert und damit teuer.
Dadurch, daß der komplette Satz der zu verwendenden Dorne miteinander lösbar verbunden ist, bleibt der jeweils nächst kleinere Dorn sowie alle folgenden kleineren Dorne eines in einer Ziehdüse in Ziehstellung befindlichen Dorns bis zur nächsten Eindellung im Bereich dieser Ziehdüse an Ort und Stelle. Dies bedeutet, daß der Abstand zwischen den einzelnen Dornen und damit die Größe der dazwischen befindlichen Verbindungsteile genügend groß sein muß, um den nächst kleineren Dorn durch eine jeweilige Ziehstation so weit nach vorne zu transportieren, daß zwischen dem größeren und dem nächst kleineren Dorn an der Ziehdüse eine Eindellung vorgenommen werden kann. Damit ist der Ort für ein Eindellwerkzeug sehr begrenzt und des muß ein unnötig langer Hohlzug in Kauf genommen werden, weil mit der Eindellung auf jeden Fall abgewartet werden muß, bis sich der nächst kleinere Dorn im Bereich der von der vorangegangenen größeren Ziehdüse verminderten Wandstärke des Rohres befindet.Such a method and a device suitable for carrying out this method have already become known from DE-OS 26 23 385. To carry out this known method, however, relatively complicated mandrels are required, which must be connected to one another, for example, by plug connections or connections having a similar effect . The formation of these connection areas is relatively complicated and therefore expensive.
Because the complete set of mandrels to be used is releasably connected to one another, the next smaller mandrel as well as all subsequent smaller mandrels of a mandrel located in a drawing nozzle remain in place until the next indentation in the area of this drawing nozzle. This means that the distance between the individual mandrels and thus the size of the connecting parts between them must be large enough to transport the next smaller mandrel through a respective drawing station so far forward that between the larger and the next smaller mandrel on the An indentation can be made in the drawing nozzle. This means that the location for an indentation tool is very limited and an unnecessarily long hollow pull must be accepted, because indentation must be waited for until the next smaller mandrel is in the area of the wall thickness of the tube which was reduced by the previous larger drawing nozzle located.

Der Erfindung liegt damit die Aufgabe zugrunde, ein Verfahren der eingangs beschriebenen Art vorzuschlagen, das einen einfacheren Dornaufbau ermöglicht, mehr Raum für die Eindellvorrichtung schafft und dennoch einen kürzeren Hohlzug ermöglicht.
Weiterhin soll eine Einrichtung zur Durchführung des Verfahrens vorgeschlagen werden.The invention is therefore based on the object of proposing a method of the type described at the outset which enables a simpler mandrel structure, creates more space for the indentation device and nevertheless enables a shorter hollow pull.
Furthermore, a device for carrying out the method is to be proposed.

Diese Aufgabe ist bei einem Verfahren der eingangs beschriebenen Art erfindungsgemäß dadurch gelöst, daß vor Ziehbeginn in bekannter Reihenfolge die gewünschte Anzahl Dorne unabhängig voneinander in den Anfangsbereich des Rohres eingebracht wird so, daß sie mit Ziehbeginn zwischen einer Ziehangel und einer hinter dem letzten und größten Dorn in das Rohr eingebrachten Eindellung angeordnet sind, worauf während des nachfolgenden Ziehprozesses die jeweils restlichen Dorne mit dem gezogenen Teil weitertransportiert werden und im Bereich der aus der jeweiligen Ziehdüse austretenden, in ihrer Dicke verminderten Rohrwandstärke aber möglichst nahe hinter dem letzten Dorn, der die vorangegangene Ziehdüse passiert hat, je eine weitere Eindellung vorgenommen wird.This object is achieved according to the invention in a method of the type described in the introduction in that the desired number of mandrels is introduced independently of one another into the initial region of the tube before the start of drawing in such a way that it begins with the drawing between a drawing bar and one behind the last and largest mandrel Indentation introduced into the pipe are arranged, whereupon during the subsequent drawing process the remaining mandrels are transported further with the drawn part and in the area of the pipe wall thickness emerging from the respective drawing nozzle but reduced in thickness, but as close as possible behind the last mandrel, which is the preceding drawing nozzle happened, each further indentation is made.

Nach diesem erfindungsgemäßen Verfahren werden also die Dorne nicht mehr lösbar miteinander verbunden, sondern weisen überhaupt keine Verbindung untereinander auf. Sie liegen lediglich lose im Rohr in der richtigen Reihenfolge hintereinander. Danach werden in an sich bekannter Weise bis auf den letzten größten Dorn alle Dorne durch die größte Ziehdüse hindurch transportiert, worauf der größte Dorn von der hinter ihm im Rohr befindlichen Delle in Ziehposition gezogen und dabei in seiner Ziehposition die Rohrwandstärke vermindert. Die dem größten Dorn vorangehenden Dorne bleiben aber nun nicht mehr relativ zu diesem größten Dorn in unveränderter Position während des Ziehvorganges, sondern wandern vielmehr mit dem Teil der zwar eine Durchmesserveränderung aber keine Wanddickenveränderung erfahren hat, ungehindert mit. Hierdurch wird zwischen dem vorhergehenden Dorn und einem nachfolgenden kleineren Dorn Platz für eine Eindellung geschaffen, mit der der jeweils nächste Dorn in die Ziehposition der nächst kleineren Düse gezogen werden soll. Da aber die vorangegangenen Dorne in dem Bereich der nicht reduzierten Wandstärke des Rohres liegen, kann die Eindellung in einem kurzen Bereich dahinter in die reduzierte Wandstärke erfolgen, so daß es nicht mehr erforderlich ist, eine größere Länge des Rohres mit reduzierter Wandstärke als Hohlzug zu ziehen. Hohlzug bedeutet hierbei, daß das zu ziehende Rohr durch eine Ziehdüse gezogen wird, ohne daß sich gleichzeitig im Ziehbereich ein Dorn in Ziehposition befindet. Somit also gelingt es mit dem erfindungsgemäßen Verfahren ein Rohr mit einem an sich bekannten Arbeitsergebnis zu ziehen, jedoch einfachere Dorne zu verwenden, die nötige Hohlzuglänge zu reduzieren und Platz für eine Eindellvorrichtung zu schaffen. Gerade der letzte Punkt erweist sich als besonders wichtig, weil nunmehr die Eindellvorrichtung so gestaltet werden kann, daß der eigentliche Eindellbolzen sich in geeigneter Weise mit der Oberflächenbewegung des Werkstückes mitbewegen kann, so daß einerseits ein Stillstand des Ziehprozesses zur Einbringung der Delle nicht nötig ist, andererseits die Rißgefahr des Werkstückes bei herkömmlicher Dellung unter Ziehgeschwindigkeit vermeidbar wird.According to the method according to the invention, the mandrels are no longer releasably connected to one another, but have no connection at all. They just lie loosely in the pipe in the right order one after the other. Then, in a manner known per se, except for the last largest mandrel, all the mandrels are transported through the largest drawing nozzle, whereupon the largest mandrel is pulled into the drawing position by the dent located behind it in the pipe, thereby reducing the pipe wall thickness in its drawing position. However, the mandrels preceding the largest mandrel no longer remain in an unchanged position relative to this largest mandrel during the drawing process, but rather move unhindered with the part which has undergone a change in diameter but no change in wall thickness. This creates space for a dent between the previous mandrel and a subsequent smaller mandrel, with which the next mandrel in the pulling position of the next smaller nozzle to be drawn. However, since the preceding mandrels lie in the area of the non-reduced wall thickness of the pipe, the indentation can take place in a short area behind the reduced wall thickness, so that it is no longer necessary to pull a larger length of the pipe with reduced wall thickness as a hollow pull . Hollow drawing here means that the pipe to be drawn is drawn through a drawing nozzle without a mandrel being in the drawing position at the same time in the drawing area. Thus, with the method according to the invention, it is possible to pull a tube with a work result known per se, but to use simpler mandrels, to reduce the necessary hollow drawing length and to make space for an indentation device. The last point in particular proves to be particularly important because the indentation device can now be designed in such a way that the actual indentation bolt can move with the surface movement of the workpiece in a suitable manner, so that on the one hand a standstill of the drawing process for introducing the dent is not necessary, on the other hand, the risk of cracking of the workpiece can be avoided in conventional detaching under pulling speed.

Vorteilhafte Ausgestaltungen dieses Verfahrens werden in den Unteransprüchen 2 und 3 beschrieben.Advantageous embodiments of this method are described in subclaims 2 and 3.

Eine Einrichtung zur Durchführung des erfindungsgemäßen Verfahrens mit mindestens zwei in Ziehrichtung aufeinander folgenden Ziehdüsen und je mindestens einer Eindellvorrichtung für jede Ziehdüse zeichnet sich dadurch aus, daß jeder Ziehdüse ein unabhängiger Ziehdorn sowie in Ziehrichtung abwärts eine Dellvorrichtung mit zwei Dellwerkzeugen in schwenkbarer und sich gegenüberliegender Anordnung an einem Hubkopf vorgesehen sind, der radial zum Werkstück beweglich ist, wobei die Dellwerkzeuge so gesteuert sind, daß die Eindellbolzen frühestens dann betätigt werden, wenn der mit nicht reduzierter Wandstärke des Werkstückes durchgeführte Hohlzugbereich des Werkstückes die Dellwerkzeuge passiert hat.A device for performing the method according to the invention with at least two successive drawing nozzles and at least one indentation device for each drawing nozzle is characterized in that each drawing nozzle has an independent drawing mandrel and, in the drawing direction downwards, a Dell device with two Dell tools in a pivoting and opposing arrangement a lifting head is provided which is movable radially to the workpiece, the Dell tools being controlled in such a way that the dowel pins are actuated at the earliest when the hollow pulling area of the workpiece which has not reduced the wall thickness of the workpiece has passed the Dell tools.

Vorteilhafte Ausgestaltungen dieser erfindungsgemäßen Einrichtung sind in den Unteransprüchen 5 bis 9 beschrieben.Advantageous embodiments of this device according to the invention are described in subclaims 5 to 9.

Die Erfindung soll nun anhand der beigefügten Zeichnungen, die ein Ausführungsbeispiel zeigen, näher erläutert werden.The invention will now be explained in more detail with reference to the accompanying drawings, which show an embodiment.

Es zeigen:

Figuren 1 bis 6
verschiedene Ziehstufen schematisch
Figur 7
Seitenansicht einer Geradeausziehmaschine mit Ziehdüse, Ziehschlitten und Eindellvorrichtung
Figur 8
Ansicht in Richtung des Pfeils B nach Figur 7
Figuren 9 bis 11
Ansicht in Richtung des Pfeils A nach Figur 7 in von Figur 11 nach Figur 9 fortschreitender Arbeitsstellung
Show it:
Figures 1 to 6
different drawing stages schematically
Figure 7
Side view of a straight-line drawing machine with a drawing nozzle, drawing slide and indentation device
Figure 8
View in the direction of arrow B according to FIG. 7
Figures 9 to 11
View in the direction of arrow A according to FIG. 7 in the working position progressing from FIG. 11 to FIG. 9

In Figur 1 ist schematisch dargestellt ein Rohr 1 zu Beginn des Ziehvorganges. Am vorderen Ende des Rohres 1 ist eine Ziehangel 9 angeformt, die bereits durch die Ziehdüse 6 hindurchgeführt wurde. Im Inneren des Rohres der Ziehdüse 6 sind die Dorne 2, 3 und 4 als völlig lose und unabhängige Stücke hintereinander in das Rohr eingelegt. Hinter dem größten Dorn 2 ist eine Eindellung 10 vorgesehen. In Ziehrichtung werden die Dorne immer kleiner.In Figure 1, a tube 1 is shown schematically at the beginning of the drawing process. At the front end of the tube 1, a drawing bar 9 is formed, which has already been passed through the drawing nozzle 6. Inside the tube of the drawing nozzle 6, the mandrels 2, 3 and 4 are inserted one after the other in the tube as completely loose and independent pieces. An indentation 10 is provided behind the largest mandrel 2. The mandrels get smaller and smaller in the pulling direction.

Wird nun über die Ziehangel 9 das Rohr 1 in Ziehrichtung 5 gezogen, so wandern die Dorne 3 und 4 durch die Ziehdüse 6 ungehindert hindurch, während dort gleichzeitig Rohr 1 in seinem Durchmesser, nicht jedoch in seiner Wandstärke reduziert wird.If the tube 1 is now pulled in the direction of drawing 5 via the drawing bar 9, the mandrels 3 and 4 migrate unhindered through the drawing nozzle 6, while tube 1 is simultaneously reduced in its diameter but not in its wall thickness.

Es kommt nun alsbald der Dorn 2 in den Bereich der Ziehdüse 6 und wird von der Eindellung 10 gegen die Ziehdüse 6 zunächst angelegt, wie dies Figur 2 zeigt. Bei weiterem Ziehfortschritt wird der Dorn 2 so weit in die Ziehdüse 6 hineingezogen, daß er in an sich bekannter Weise nunmehr in Ziehposition sitzt und hierbei die Wandstärke des Rohres 1 reduziert. Diese Situation ist in der Darstellung nach Figur 3 eingetreten. Hierbei ist bei Figur 3 zu sehen, daß sich die Dorne 3 und 4 noch im vorderen Bereich des Rohres mit unverminderter Wanddicke befinden. Kurz hinter dem größeren Dorn 3 beginnt allerdings schon die Dickenverminderung der Wandstärke. In diesem Bereich kann die nächste Delle 11 gesetzt werden, die in Figur 3 in übertrieben weitem Abstand zum Dorn 3 dargestellt ist.Immediately the mandrel 2 comes into the area of the drawing nozzle 6 and is initially applied by the indentation 10 against the drawing nozzle 6, as shown in FIG. 2. With further drawing progress, the mandrel 2 is drawn so far into the drawing nozzle 6 that it is now in a manner known per se Pull position sits and thereby reduces the wall thickness of the tube 1. This situation has occurred in the illustration according to FIG. 3. It can be seen in Figure 3 that the mandrels 3 and 4 are still in the front region of the tube with an undiminished wall thickness. Shortly after the larger mandrel 3, the thickness of the wall thickness begins to decrease. In this area, the next dent 11 can be set, which is shown in Figure 3 at an exaggerated distance from the mandrel 3.

In der nächsten Ziehdüse 7 (Figur 4) wird der Außendurchmesser des Rohres unmittelbar hinter der Ziehangel 9 erneut vermindert, so daß an dieser Ziehdüse 7 der Dorn 3 aufgehalten wird. Es wird nun durch diese Ziehdüse 7 der Bereich des Rohres mit der nicht reduzierten Wandstärke unter gleichzeitiger Durchmesserverringerung des Rohres 1 hindurchgezogen, so daß der Dorn 3 hierdurch relativ zum Rohr rückwärts wandert in den Bereich des Rohres mit der reduzierten Wandstärke. Die Eindellung 11 kann so gelegt sein, daß dann sofort die Eindellung 11 den Dorn 3 in die Ziehdüse 7 hinein in Ziehposition zieht um nun dort die Wandstärke weiter zu vermindern. Dies ist die Position nach Figur 4. Der Ziehprozess wird nun fortgesetzt und es wird die Eindellung 12 nach Figur 5 im Bereich des Rohres mit der vom Dorn 3 verminderten Wandstärke vorgenommen. Diese Delle 12 wird schließlich in der letzten Ziehdüse 8 dafür sorgen, daß der vor der letzten Ziehdüse 8 hängen bleibende Dorn 4 schließlich dort in Ziehposition gezogen wird, so daß auch an der Ziehdüse 8 eine weitere Querschnittsverminderung der Wandstärke des Rohres 1 erreicht wird (Figur 6).In the next drawing nozzle 7 (FIG. 4), the outside diameter of the tube immediately behind the drawing bar 9 is reduced again, so that the mandrel 3 is stopped at this drawing nozzle 7. It is now pulled through this drawing nozzle 7, the area of the tube with the non-reduced wall thickness while reducing the diameter of the tube 1, so that the mandrel 3 thereby migrates backwards relative to the tube into the area of the tube with the reduced wall thickness. The indentation 11 can be placed such that the indentation 11 then immediately pulls the mandrel 3 into the drawing nozzle 7 into the drawing position in order to further reduce the wall thickness there. This is the position according to FIG. 4. The drawing process is now continued and the indentation 12 according to FIG. 5 is carried out in the region of the tube with the wall thickness reduced by the mandrel 3. This dent 12 will finally ensure in the last drawing nozzle 8 that the mandrel 4 stuck in front of the last drawing nozzle 8 is finally pulled into the drawing position there, so that a further reduction in cross-section of the wall thickness of the tube 1 is also achieved on the drawing nozzle 8 (FIG 6).

In den Figuren 7 bis 11 ist eine Geradeausziehmaschine mit einer Eindellvorrichtung schematisch dargestellt. Geradeausziehmaschinen mit intermittierend arbeitenden Ziehschlitten 20 sind hinreichend bekannt und bedürfen hier nicht der näheren Erläuterung. In Figur 7 ist schematisch in Seitenansicht von einer solchen Geradeausziehmaschine 19 die Ziehdüse 7 mit einem durch die Ziehdüse 7 bereits hindurchgeführten Anfang des Rohres 1 mit der Ziehangel 9 dargestellt. Mit einem an sich bekannten Greifer ergreift der Ziehschlitten 20 die Ziehangel 9 und zieht das Rohr 1 in Ziehrichtung 5 um den Einziehhub 13 durch die Ziehdüse 7. Dieser Vorgang ist bekannt und muß daher hier nicht weiter erläutert werden.A straight-line drawing machine with an indentation device is shown schematically in FIGS. Straight pulling machines with intermittent pulling carriages 20 are well known and do not require further explanation here. In FIG. 7, the drawing nozzle 7 is shown schematically in a side view of such a straight-line drawing machine 19 with a start of the tube 1 with the drawing bar 9 that has already passed through the drawing nozzle 7. With a gripper known per se, the drawing slide 20 grips the drawing bar 9 and pulls the tube 1 in the drawing direction 5 through the drawing stroke 13 through the Drawing nozzle 7. This process is known and therefore need not be explained further here.

Von oben, von unten oder auch von der Seite ist eine Eindellvorrichtung 14 radial zum Werkstück 1 in Geradführungen 23, verschiebbar von einer Antriebseinrichtung 24, ausgebildet als Hydraulikzylinder, in Richtung des Pfeiles 22 bewegbar. Diese Eindellvorrichtung 14 weist auf der dem Werkstück 1 zugewandten Seite einen Hubkopf 21 auf, an dem Dellwerkzeuge 15 und 16 auf der dem Werkstück 1 zugewandten Seite um die zueinander parallel verlaufenden Achsen 25 und 26 schwenkbar gelagert sind. Die Schwenkbewegung kann hierbei von einem als Hydraulikzylinder ausgebildeten Schwenkantrieb 30 über einen entsprechenden, mit der Schwenkachse 25 verbundenen, nicht näher bezeichneten Hebel durchgeführt werden. Auf der Schwenkachse 25 ist hierbei auf der Oberseite des Hubkopfes 21 ein Zahnkranzsegment 28 vorgesehen, das mit einem Zahnkranzsegment 29, welches mit der Schwenkachse 26 drehfest verbunden ist, kämmt. Eine Schwenkbewegung des Zahnkranzsegmentes 28 wird damit in umgekehrter Drehrichtung auf das Zahnkranzsegment 29 und damit jeweils auf die Dellwerkzeuge 15 bzw. 16 übertragen, die sich damit in gegenüberliegender Anordnung und jeweils in umgekehrter Drehrichtung bewegen.From above, from below or from the side, an indentation device 14 can be moved radially to the workpiece 1 in straight guides 23, displaceable by a drive device 24, designed as a hydraulic cylinder, in the direction of arrow 22. This indentation device 14 has a lifting head 21 on the side facing the workpiece 1, on which Dell tools 15 and 16 are pivotally mounted on the side facing the workpiece 1 about the axes 25 and 26 running parallel to one another. The swiveling movement can in this case be carried out by a swivel drive 30 designed as a hydraulic cylinder via a corresponding lever, which is connected to the swivel axis 25 and is not designated in any more detail. On the swivel axis 25, a toothed ring segment 28 is provided on the upper side of the lifting head 21, which meshes with a toothed ring segment 29, which is connected to the swivel axis 26 in a rotationally fixed manner. A pivoting movement of the ring gear segment 28 is thus transmitted in the opposite direction of rotation to the ring gear segment 29 and thus in each case to the Dell tools 15 and 16, which thus move in the opposite arrangement and in each case in the opposite direction of rotation.

Die Dellwerkzeuge 15 und 16 weisen an ihrer zum Werkstück 1 zeigenden Seite Eindellbolzen 17 und 18 auf, die dann, wenn sie soweit geschwenkt sind, daß sie auf einer Geraden durch die beiden Schwenkachsen 25 und 26 liegen, mit ihren Spitzen einen solchen Abstand aufweisen, der kleiner ist als der Außendurchmesser des dort ankommenden Werkstücks 1, so daß sie dort am Werkstück 1 eine entsprechende Eindellung vornehmen.The Dell tools 15 and 16 have dent pins 17 and 18 on their side facing the workpiece 1, which, when pivoted to such an extent that they lie on a straight line through the two pivot axes 25 and 26, have such a distance with their tips, which is smaller than the outer diameter of the workpiece 1 arriving there, so that they make a corresponding indentation on the workpiece 1 there.

Die Eindellung als solche wird während des eben genannten ersten Einziehhubes und vor Ende des Einziehhubes derart durchgeführt, daß dann, wenn der Ziehschlitten 20 in Ziehrichtung 5 genügend weit verfahren ist, die Eindellvorrichtung 14, getrieben von der Antriebseinrichtung 24, radial auf das Werkstück 1 zu in Arbeitsposition gefahren wird. Der Schwenkantrieb 30 hat dann die Dellwerkzeuge 15 und 16 so geschwenkt, wie dies in Figur 11 dargestellt ist.The indentation as such is carried out during the first pulling-in stroke just mentioned and before the end of the pulling-in stroke in such a way that when the pulling slide 20 has moved sufficiently far in the pulling direction 5, the denting device 14, driven by the drive device 24, radially towards the workpiece 1 is driven into the working position. The pivot drive 30 has then pivoted the Dell tools 15 and 16 as shown in FIG. 11.

Um das Zusammenwirken deutlicher zu machen, ist in den Figuren 9 bis 11 das jeweilige Zahnkranzsegment 28 bzw. 29 so dargestellt, als sei es auf der Unterseite des Hubkopfes 21 angeordnet. In Wirklichkeit sind jedoch die Zahnkranzsegmente 28 und 29 vorzugsweise auf der Oberseite des Hubkopfes 21 angeordnet, wie dies die Figur 8 zeigt und damit in den Figuren 8 bis 11 unsichtbar. In der Figur 7 ist der Einfachheit halber kein Dellwerkzeug 15 oder 16 auf der Unterseite des Hubkopfes 21 gezeichnet. Die Anordnung geht klar aus der Figur 8 und den Figuren 9 bis 11 hervor.To make the interaction clearer, the respective ring gear segment 28 or 29 is shown in FIGS. 9 to 11 as if it were arranged on the underside of the lifting head 21. In reality, however, the ring gear segments 28 and 29 are preferably arranged on the top of the lifting head 21, as shown in FIG. 8 and thus invisible in FIGS. 8 to 11. For the sake of simplicity, FIG. 7 shows no Dell tool 15 or 16 on the underside of the lifting head 21. The arrangement is clear from Figure 8 and Figures 9 to 11.

Ist nun die Eindellvorrichtung 14 wie beschrieben in Arbeitspositon gefahren worden, so nehmen Werkstück 1 und Dellwerkzeuge 15 und 16 eine relative Lage zueinander ein, wie dies in Figur 11 erkennbar ist. Das Werkstück 1 wird nun in Ziehrichtung 5 weiterbewegt und gleichzeitig werden die Dellwerkzeuge 15 und 16 durch eine entsprechende Betätigung des Schwenkantriebs 30 so geschwenkt, daß die Eindellbolzen 17 und 18 eine Umfangsgeschwindigkeit aufweisen, die der Ziehgeschwindigkeit des Werkstückes 1 in Ziehrichtung 5 entspricht. Hierbei bewegen sich dann die Eindellbolzen 17 und 18 auf die Oberfläche des Werkstückes 1 zu und dellen damit das Werkstück 1 ein in einer Position wie in Figur 10 dargestellt. Diese Anordnung nach Figur 10 ist in anderer Ansicht in Figur 8 wiedergegeben.
Der Einziehub in Ziehrichtung 5 wird nun fortgesetzt und es bewegen sich die Eindellbolzen 17 und 18 und damit die Dellwerkzeuge 15 und 16 infolge ihrer Schwenkbewegung mit, so daß sie schließlich wieder außer Eingriff kommen und die Delle zurücklassen, wie dies in Figur 9 dargestellt ist. Es wird nun nachfolgend die Eindellvorrichtung 14 wieder zurück in ihre Ausgangsposition (Figur 7) gefahren und der Ziehvorgang in bekannter Weise fortgesetzt.If the denting device 14 has now been moved into the working position as described, the workpiece 1 and the Dell tools 15 and 16 assume a relative position to one another, as can be seen in FIG. 11. The workpiece 1 is now moved in the direction of drawing 5 and at the same time the Dell tools 15 and 16 are pivoted by a corresponding actuation of the swivel drive 30 so that the dent bolts 17 and 18 have a peripheral speed which corresponds to the drawing speed of the workpiece 1 in the direction of drawing 5. The dent pins 17 and 18 then move towards the surface of the workpiece 1 and thus dent the workpiece 1 in a position as shown in FIG. 10. This arrangement according to FIG. 10 is shown in a different view in FIG. 8.
The pull-in stroke in the direction of drawing 5 is now continued and the indenting bolts 17 and 18 and thus the Dell tools 15 and 16 also move as a result of their pivoting movement, so that they finally come out of engagement again and leave the dent, as shown in FIG. 9. Subsequently, the indentation device 14 is moved back into its starting position (FIG. 7) and the drawing process is continued in a known manner.

Es ist ohne weiteres zu erkennen, daß der Ziehvorgang für die Eindellung nicht unterbrochen werden muß, und daß trotz der Bewegung des Werkstückes während des Einziehvorganges keinerlei Überlastungsgefahr oder Anrißgefahr des Werkstückes im Bereich der Eindellung, hervorgerufen durch ein starres Eindellwerkzeug, besteht.It can easily be seen that the drawing process for the indentation does not have to be interrupted, and that despite the movement of the workpiece during the drawing-in process there is no risk of overloading or tearing of the workpiece in the region of the indentation, caused by a rigid indenting tool.

Dadurch, daß an jeder einzelnen Ziehstufe ein Einziehhub durchgeführt wird, wobei die Eindellung für den nächst kleineren Ziehdorn bis zum Abschluß des Einziehhubes eingebracht ist, müssen keinerlei besondere Maßnahmen mehr getroffen werden um den richtigen Zeitpunkt für die Eindellung festzustellen. Die Schwenkbewegung der Eindellbolzen und die dadurch hervorgerufene Eindellung verhindern eine falsche Belastung des Werkstückes während des Eindellvorganges und beseitigen dadurch die Gefahr von Beschädigung. Dadurch, daß zwei Eindellbolzen in sich gegenüberliegender Anordnung vorgesehen sind, wird gleichzeitig eine unerwünschte Biegebelastung des Werkstückes während des Eindellvorganges vermieden.The fact that a pull-in stroke is carried out at each individual drawing stage, the indentation for the next smaller mandrel being introduced until the end of the pull-in stroke, means that no special measures need to be taken to determine the correct time for the indentation. The pivoting movement of the dent pins and the resulting dent prevent incorrect loading of the workpiece during the dent process and thereby eliminate the risk of damage. Due to the fact that two dent pins are provided in an opposing arrangement, an undesired bending load on the workpiece during the dent process is avoided at the same time.

Die Zuordnung eines unabhängigen Ziehdornes zu jeder Ziehdüse sorgt dafür, daß die nicht zu einer bestimmten Ziehdüse gehörigen kleineren Ziehdorne mit dem Ziehfortschritt vorwärts bewegt werden und nicht bis zur Eindellung in der Nähe der letzten Ziehdüse hängen bleiben. Erst hierdurch wird es möglich, die jeweilige Eindellung so weit von der letzten Ziehdüse fort vorzunehmen, daß genügend Bauraum für eine mitschwenkbare oder mitfahrbare Eindellvorrichtung geschaffen wird, wobei dennoch die Eindellung in geeignet kurzem Abstand hinter dem letzten Ziehdorn vorgenommen werden kann, so daß unnötiger Hohlzug vermieden wird. Hierbei sollte jedoch ein so langes Stück des Rohres 1 mit in der letzten Ziehdüse reduzierter Wandstärke die Dellvorrichtung vor der Durchführung des Eindellvorganges passiert haben, daß zwischen der Delle als hintere Begrenzung einerseits und dem Ende des Hohlzugsbereichs mit in der letzten Ziehdüse unverminderter Wandstärke genügend Platz für den für die nächste Ziehdüse vorgesehenen Dorn vorhanden ist, weil sonst in der nächsten Ziehdüse in einer Stufe eine zu große Querschnittsverminderung der Wanddicke des Rohres vorgenommen werden müßte und hierdurch die Gefahr bestünde, daß das Werkstück Schaden leidet oder aber der Ziehdorn von der Delle nicht in Ziehposition in die Ziehdüse hineingezogen werden kann.The assignment of an independent mandrel to each die ensures that the smaller mandrels that do not belong to a particular die are moved forward with the progress of the drawing and do not get stuck in the vicinity of the last die until the indentation. This is the only way to make the indentation far enough from the last drawing nozzle that sufficient space is created for a swiveling or traveling indentation device, whereby the indentation can nevertheless be carried out at a suitably short distance behind the last drawing mandrel, so that unnecessary hollow pulling is avoided. Here, however, such a long piece of tube 1 with reduced wall thickness in the last drawing nozzle should have passed the Dell device before the indentation process was carried out, that between the dent as the rear boundary on the one hand and the end of the hollow pull area with undiminished wall thickness in the last drawing nozzle, there was sufficient space for the mandrel provided for the next drawing nozzle is present, because otherwise the cross-section of the wall thickness of the tube would have to be reduced too much in one step in the next drawing nozzle and there would be a risk that the workpiece would suffer damage or the drawing mandrel would not be dented Pull position can be pulled into the die.

Besonders vorteilhaft ist es, wenn die Eindellvorrichtung oder mindestens der Hubkopf der Eindellvorrichtung in Geradführungen von einer Antriebseinrichtung auf das Werkstück zu und von diesen weg bewegt werden kann. Dies ist eine einfache und bewehrte Konstruktion, die eine genaue und rasche Verschiebung und Positionierung erlaubt. Allerdings wäre auch eine Einschwenkbewegung des Hubkopfes möglich.It is particularly advantageous if the indentation device or at least the lifting head of the indentation device can be moved in straight guides from a drive device towards and away from the workpiece. This is a simple and armored construction that allows for accurate and rapid movement and positioning. However, a pivoting movement of the lifting head would also be possible.

Die Zahnkranzsegmente, mit denen die Drehbewegung der Dellwerkzeuge koordiniert wird, stellen eine einfache Sicherung dafür dar, daß eine richtige Bewegungsfolge der Eindellwerkzeuge erreicht wird. Gleichzeitig wird hierdurch ein zweiter Schwenkantrieb sowie die dann notwendigen Koordinierungsmaßnahmen überflüssig. Der Schwenkantrieb selbst kann durchaus sehr schwach ausgebildet sein, weil die Eindellkraft durch die Einziehbewegung des Werkstückes erzeugt werden kann.The ring gear segments, with which the rotary movement of the Dell tools is coordinated, provide a simple means of ensuring that a correct sequence of movements of the indenting tools is achieved. At the same time, this eliminates the need for a second rotary actuator and the coordination measures that are then required. The swivel drive itself can be made very weak because the indentation force can be generated by the retracting movement of the workpiece.

Die Erfindung ist natürlich nicht auf die Anwendung von drei Ziehdüsen beschränkt sondern kann ebensogut bei mehr oder weniger Ziehdüsen ausgeführt werden.The invention is of course not limited to the use of three drawing nozzles but can just as well be carried out with more or fewer drawing nozzles.

Liste der verwendeten BezugszeichenList of the reference symbols used

11
Rohrpipe
22nd
Dornmandrel
33rd
Dornmandrel
44th
Dornmandrel
55
ZieheinrichtungPulling device
66
ZiehdüseDrawing nozzle
77
ZiehdüseDrawing nozzle
88th
ZiehdüseDrawing nozzle
99
ZiehangelDrawbar
1010th
EindellungIndentation
1111
EindellungIndentation
1212
EindellungIndentation
1313
EinziehhubPull-in stroke
1414
EindellvorrichtungIndentation device
1515
DellwerkzeugDell tool
1616
DellwerkzeugDell tool
1717th
EindellbolzenDowel bolts
1818th
EindellbolzenDowel bolts
11
9 Geradeausziehmaschine9 straight pulling machine
2020th
ZiehschlittenPulling sledge
2121
HubkopfLifting head
2222
RadialbewegungRadial motion
2323
GeradführungStraight guidance
2424th
AntriebseinrichtungDrive device
2525th
SchwenkachseSwivel axis
2626
SchwenkachseSwivel axis
2727th
WerkstücklängsachseWorkpiece longitudinal axis
2828
ZahnkranzsegmentSprocket segment
2929
ZahnkranzsegmentSprocket segment
3030th
SchwenkantriebSwivel drive

Claims (9)

  1. Method for the straight drawing of a tube in at least two stages by means of a number of mandrels (2, 3, 4) located in the interior of the tube, the number of mandrels corresponding to the number of drawing stages, wherein each mandrel (2, 3, 4) is brought into the drawing position by an indentation (10, 11, 12) introduced into the tube (1) before the next die (6, 7, 8) but behind the mandrel associated with this die (6, 7, 8) in the drawing direction (5), characterised in that before the commencement of drawing the desired number of mandrels (2, 3, 4) is introduced in a known sequence and independently of one another into the initial region of the tube (1), so that when drawing commences they are arranged between a drawing tongue (9) and an indentation (10) introduced into the tube (1) behind the last and largest mandrel (7), whereupon during the subsequent drawing process the remaining mandrels (3, 4) are each transported further with the drawn part, and a further indentation (11, 12) is made in each case in the region of the reduced tube wall thickness emerging from the respective die, but as near as possible behind the last mandrel which has passed the preceding die.
  2. Method as claimed in claim 1, characterised in that at each drawing stage an intake stroke is carried out, and the indentation (11) for the next smaller drawing mandrel is introduced until the termination of the intake stroke.
  3. Method as claimed in one of claims 1 to 2, characterised in that during the intake stroke indenting pins (17, 18) are applied to the tube (1) in a suitable position and are pushed in by a co-pivoting movement.
  4. Apparatus for carrying out the method as claimed in one of claims 1 to 3, with at least two dies (6, 7, 8) succeeding one another in the drawing direction (5) and at least one indenting device (14) for each die (6, 7, 8), characterised in that for each die (6. 7, 8) there are provided an independent mandrel (2, 3, 4) as well as, downwards in the drawing direction, an indenting device (14) with two indenting tools (15, 16) arranged pivotably and opposite one another on a lifting head (21) which is movable radially (22) with respect to the workpiece (1). the intending tools being controlled in such a way that the indenting pins (17, 18) are actuated at the earliest when the hollow drawn region of the workpiece which has gone through without reduction of the wall thickness of the workpiece has passed the indenting tools (15, 16).
  5. Apparatus as claimed in claim 4, characterised in that each indenting device (14) is arranged on a straight drawing machine (19) with an intermittently operating drawing carriage (20) and depending upon the intake stroke (13) of a drawing carriage (20) is controlled so that the indentation (10, 11, 12) is completed by the end of the intake stroke.
  6. Apparatus as claimed in claim 4, characterised in that the lifting head (21) is constructed so that it is movable in guides (23) by a drive mechanism (24).
  7. Apparatus as claimed in one of claims 4 to 6, characterised in that the pivot spindles (25, 26) of the indenting tools (15, 16) run parallel to one another and at right angles to a plane through the longitudinal axis (27) of the workpiece.
  8. Apparatus as claimed in claim 7, characterised in that the spindles (25, 26) have gear ring segments (28, 29) which mesh with one another.
  9. Apparatus as claimed in one of claims 4 to 8, characterized in that an indenting tool (15) is equiped with a pivoting drive (30).
EP88112596A 1988-08-03 1988-08-03 Method for the straight drawing of tubes, and device for carrying out the method Expired - Lifetime EP0353324B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP88112596A EP0353324B1 (en) 1988-08-03 1988-08-03 Method for the straight drawing of tubes, and device for carrying out the method
DE8888112596T DE3872231D1 (en) 1988-08-03 1988-08-03 METHOD FOR STRAIGHT PIPING AND DEVICE FOR IMPLEMENTING THE METHOD.
JP63329531A JPH0246910A (en) 1988-08-03 1988-12-28 Method and device for drawing tube
FI893420A FI98132C (en) 1988-08-03 1989-07-14 A method for straightening a pipe and a device for carrying out the method
US07/387,861 US4962658A (en) 1988-08-03 1989-07-31 Method and apparatus for straight drawing a pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88112596A EP0353324B1 (en) 1988-08-03 1988-08-03 Method for the straight drawing of tubes, and device for carrying out the method

Publications (2)

Publication Number Publication Date
EP0353324A1 EP0353324A1 (en) 1990-02-07
EP0353324B1 true EP0353324B1 (en) 1992-06-17

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ID=8199173

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Application Number Title Priority Date Filing Date
EP88112596A Expired - Lifetime EP0353324B1 (en) 1988-08-03 1988-08-03 Method for the straight drawing of tubes, and device for carrying out the method

Country Status (5)

Country Link
US (1) US4962658A (en)
EP (1) EP0353324B1 (en)
JP (1) JPH0246910A (en)
DE (1) DE3872231D1 (en)
FI (1) FI98132C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4328002C1 (en) * 1993-08-20 1994-08-04 Schumag Ag Procedure for preparing a thick-walled pipe blank for a subsequent cascade train

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4306181A1 (en) * 1993-02-27 1994-09-01 Kabelmetal Ag Process for producing a plug chamber when cascading pipes and device for carrying out the process
JP5136990B2 (en) * 2008-12-03 2013-02-06 新日鐵住金株式会社 Manufacturing method of ultra-thin seamless metal pipe using floating plug
CN105499289B (en) * 2016-01-07 2018-04-20 山东亨圆铜业有限公司 A kind of anticollision floating core head

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2155437A (en) * 1937-10-12 1939-04-25 Aluminum Co Of America Tube drawing method
US2600254A (en) * 1947-03-20 1952-06-10 Lysobey John Wall treatment of tubing
DE2131874C3 (en) * 1971-06-26 1984-07-19 Benteler-Werke Ag, 4794 Schloss Neuhaus Device for reducing pipe strings
DE2623385C2 (en) * 1976-05-25 1984-03-15 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Method for inserting thorns into a length of pipe to be drawn
DE3405641A1 (en) * 1984-02-17 1985-08-22 Schumag Gmbh, 5100 Aachen METHOD FOR DRAWING A SEAMLESS METAL TUBE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4328002C1 (en) * 1993-08-20 1994-08-04 Schumag Ag Procedure for preparing a thick-walled pipe blank for a subsequent cascade train

Also Published As

Publication number Publication date
EP0353324A1 (en) 1990-02-07
FI98132B (en) 1997-01-15
DE3872231D1 (en) 1992-07-23
US4962658A (en) 1990-10-16
JPH046447B2 (en) 1992-02-05
JPH0246910A (en) 1990-02-16
FI98132C (en) 1997-04-25
FI893420A (en) 1990-02-04
FI893420A0 (en) 1989-07-14

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