EP3181250B1 - Method of making hollow metallic workpieces - Google Patents

Method of making hollow metallic workpieces Download PDF

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Publication number
EP3181250B1
EP3181250B1 EP16201891.5A EP16201891A EP3181250B1 EP 3181250 B1 EP3181250 B1 EP 3181250B1 EP 16201891 A EP16201891 A EP 16201891A EP 3181250 B1 EP3181250 B1 EP 3181250B1
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EP
European Patent Office
Prior art keywords
lining
material layer
tube
profiled
preformed
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EP16201891.5A
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German (de)
French (fr)
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EP3181250A1 (en
Inventor
Robert Koppensteiner
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GFM GmbH
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GFM GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/12—Forming profiles on internal or external surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J15/00—Riveting
    • B21J15/10—Riveting machines
    • B21J15/12—Riveting machines with tools or tool parts having a movement additional to the feed movement, e.g. spin
    • 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
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/154—Making multi-wall tubes

Definitions

  • the invention relates to a method for producing hollow metallic workpieces from a jacket tube having a profiled inner surface and a lining of the following inner lining of a material layer of the jacket tube forming a composite material layer, wherein the jacket tube is forged over a mandrel.
  • a disadvantage is that by the subsequent application of the lining of an elastomeric, thermoplastic, ceramic or metallic material on the coiled inner surface of the casing tube made of steel depending on the respectively selected taking into account the material of the lining application method, such as galvanic or electrolytic deposition, casting , Firing, plasma spraying or thermofixing, the adhesion of the lining to the profiled casing pipe often can not meet higher requirements.
  • the profiling of the lining with a comparatively high manufacturing tolerance which can be taken in linings made of an elastomeric material in purchasing, however, leads to a reworking in metallic liners, if higher demands are placed on the manufacturing tolerances.
  • the invention is thus based on the object, a method for producing hollow metallic workpieces with a pronounced profiling of the inner surface in such a way that in addition to simple manufacturing conditions, a high dimensional stability can be ensured.
  • the invention solves the stated object in that the material layer of the lining is introduced into the preformed in approaching the profiled inner surface of the casing, before the preformed casing tube with the material layer of the lining over the profiled inner surface of the workpiece forcing the mandrel.
  • a jacket tube is prepared with an approximated to the profiled inner surface of the workpiece profile shape, in which a later lining resulting material layer is introduced, by a subsequent common cold forging the preformed jacket tube and introduced into the casing material layer via a corresponding profiled inner surface of the workpiece profiled mandrel not only a metallurgically advantageous, intimate Achieved connection between the jacket tube and the lining, but also a high dimensional accuracy for the profiled inner surface of the hollow workpiece can be achieved without having to accept a post-processing of this inner surface.
  • the profiling therefore, only the possible forging via a mandrel is to be assumed.
  • the casing tube and the material layer of the lining can be first connected by a hot deformation through a mandrel into a composite body before the composite body by a cold forging over the the profiled inner surface defining mandrel is formed to the workpiece.
  • the hot deformation of the jacket body together with the material layer of the lining introduced into the jacket tube on the one hand achieves a metallurgically advantageous bonding effect between the metallic materials of the jacket tube and the lining and, on the other hand, enables an additional step of preforming in approximation to the profiled inner surface of the workpiece to be produced. This means that the cold deformation of larger local displacements of the material layer relative to the profiled inner surface of the casing tube are prevented and is to ensure the cold worked only the exact profiled inner surface of the workpiece.
  • the material layer of the lining can be introduced in different ways into the preformed jacket tube, since it only depends on a substantially uniform distribution of the material layer of the lining over the pre-profiled inner surface of the jacket tube.
  • the material layer of the lining can therefore be applied for example by spraying, spraying or casting and the like.
  • On the preformed inner surface of the jacket tube it is also possible to introduce this layer of material in the form of a resiliently biased wire helix in the jacket tube, after insertion of the wire helix, applying the wire windings to the preformed inner surface of the jacket tube under the to achieve resilient bias.
  • the workpiece according to the schematic representation of the Fig. 1 and 2 has a jacket 1 with a profiled inner surface 2 and a lining 3, which follows the profiled inner surface 2 of the shell 1 and thus forms one of the profiled inner surface 2 of the shell 1 corresponding inner surface 4 of the workpiece.
  • the intended for the lining 3 material layer is prefabricated in the form of a lining tube 7, according to the FIGS.
  • the preformed liner tube 7 and the preformed jacket tube 5 can thus according to the FIGS. 7 and 8 nested together to then together by cold forging over a mandrel to the composite body of the workpiece according to the Fig. 1 and 2 to be transformed.
  • thermoforming for the intimate connection of the jacket tube 5 and the lining tube 7 to a composite body prior to cold working to prevent such a local displacement of the material layer of the liner relative to the jacket tube.
  • the invention is not bound to such introduction of the material layer in the preformed jacket tube 5, it depends only on, for the common forging of the jacket tube 5 and Lining 3 provide a corresponding material layer of the lining 3 within the casing tube 5, which can be achieved for example by spraying or casting a corresponding material layer on the pre-profiled inner surface 6 of the casing tube 5.
  • the introduction of a corresponding layer of material of the liner 3 can thus be made in any way that a subsequent common forging of the jacket tube. 5 and the introduced material layer of the liner 3 allowed over a profiled mandrel.
  • this non-uniform material can flow in the region of the lining in order to maintain a uniform thickness of the lining 3 of the finished workpiece 3 be taken into account by introducing the material layer with corresponding thickness differences, so that after the cold forging required for the completion of the workpiece, a uniformly thick lining 3 is achieved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Description

Die Erfindung bezieht sich auf ein Verfahren zum Herstellen hohler metallischer Werkstücke aus einem Mantelrohr mit einer profilierten Innenfläche und einer der profilierten Innenfläche folgenden Auskleidung aus einer mit dem Werkstoff des Mantelrohrs einen Verbund bildenden Werkstoffschicht, wobei das Mantelrohr über einen Dorn geschmiedet wird.The invention relates to a method for producing hollow metallic workpieces from a jacket tube having a profiled inner surface and a lining of the following inner lining of a material layer of the jacket tube forming a composite material layer, wherein the jacket tube is forged over a mandrel.

Um den Mantel eines Gehäuses für einen Bohrmotor mit einer gleichmäßig dicken Auskleidung für die gewendelte Innenfläche zur Aufnahme eines gewendelten Rotors versehen zu können, ist es bekannt (Siehe WO 99/31389 A2 , welche die Basis für den Oberbegriff des Anspruchs 1 bildet) von einem Mantelrohr auszugehen, das mit einer die gewendelte Innenfläche für die Auskleidung vorgebenden Form durch ein Walzen oder Schmieden über einen entsprechend geformten Dorn hergestellt wird, sodass die Auskleidung lediglich in einer vorgegeben Dicke auf die gewendelte Innenfläche des vorgefertigten Mantelrohrs aufgebracht werden muss, um das Gehäuse für den Bohrmotor zu erhalten. Nachteilig ist allerdings, dass durch das nachträgliche Aufbringen der Auskleidung aus einem elastomeren, thermoplastischen, keramischen oder metallischen Werkstoff auf die gewendelte Innenfläche des Mantelrohrs aus Stahl in Abhängigkeit von dem jeweils unter Berücksichtigung des Werkstoffs der Auskleidung gewählten Auftragsverfahren, wie galvanisches oder elektrolytisches Abscheiden, Gießen, Brennen, Plasmaspritzen oder Thermofixieren, die Haftung der Auskleidung am profilierten Mantelrohr häufig höheren Anforderungen nicht genügen kann. Außerdem muss für die Profilierung der Auskleidung mit einer vergleichsweise hohen Fertigungstoleranz gerechnet werden, was bei Auskleidungen aus einem elastomeren Werkstoff in Kauf genommen werden kann, bei metallischen Auskleidungen jedoch zu einer Nachbearbeitung führt, wenn höhere Ansprüche an die Fertigungstoleranzen gestellt werden.In order to be able to provide the casing of a casing for a drilling motor with a uniformly thick inner spiral surface lining for receiving a coiled rotor, it is known (see US Pat WO 99/31389 A2 which forms the basis for the preamble of claim 1) starting from a jacket tube, which is produced with a coiled inner surface for the lining predetermining form by rolling or forging over a correspondingly shaped mandrel, so that the lining only in a predetermined thickness The coiled inner surface of the prefabricated casing pipe must be applied to obtain the housing for the drill motor. A disadvantage, however, is that by the subsequent application of the lining of an elastomeric, thermoplastic, ceramic or metallic material on the coiled inner surface of the casing tube made of steel depending on the respectively selected taking into account the material of the lining application method, such as galvanic or electrolytic deposition, casting , Firing, plasma spraying or thermofixing, the adhesion of the lining to the profiled casing pipe often can not meet higher requirements. In addition, it must be expected for the profiling of the lining with a comparatively high manufacturing tolerance, which can be taken in linings made of an elastomeric material in purchasing, however, leads to a reworking in metallic liners, if higher demands are placed on the manufacturing tolerances.

Zur Herstellung eines zumindest zweilagigen, metallischen Verbundrohrs unter geringen Fertigungstoleranzen ist es außerdem bekannt ( RU 2171164 C1 ), in ein eine Außenlage bildendes Mantelrohr eine Innenlage aus einem zumindest einlagig zu einem Rohrkörper gewundenen Blechstreifen einzubringen und das Mantelrohr mit der rohrförmigen Innenlage durch ein Kaltschmieden über einen Dorn zu einem Verbundkörper mit dem Vorteil zu verbinden, dass durch die Kaltverformung nicht nur die Festigkeit des Verbundes erhöht, sondern auch die Fertigungstoleranz klein gehalten werden kann. Wegen der zylindrischen Innenfläche des Verbundrohrs kann außerdem eine über die Rohrlänge gleichmäßige Dicke der metallischen Innenschicht sichergestellt werden, wie dies beispielsweise für Zylindergehäuse von Bedeutung ist. Dieses Verfahren eignet sich jedoch nicht zur Herstellung von hohlen Werkstücken mit einer profilierten Innenfläche.For producing an at least two-layer metallic composite pipe with low manufacturing tolerances, it is also known (US Pat. RU 2171164 C1 ), in an outer layer forming a jacket tube to introduce an inner layer of a wound at least one layer to a tubular body sheet metal strip and to connect the jacket tube with the tubular inner layer by a cold forging over a mandrel to a composite body with the advantage that the cold deformation not only the strength of the composite increased, but also the manufacturing tolerance can be kept small. Because of the cylindrical inner surface of the composite tube also over the tube length uniform thickness of the metallic inner layer can be ensured, as is important for example for cylinder housing. However, this method is not suitable for the production of hollow workpieces with a profiled inner surface.

Der Erfindung liegt somit die Aufgabe zugrunde, ein Verfahren zum Herstellen hohler metallischer Werkstücke mit einer ausgeprägten Profilierung der Innenfläche so auszugestalten, dass neben einfachen Herstellungsbedingungen eine hohe Maßhaltigkeit sichergestellt werden kann.The invention is thus based on the object, a method for producing hollow metallic workpieces with a pronounced profiling of the inner surface in such a way that in addition to simple manufacturing conditions, a high dimensional stability can be ensured.

Ausgehend von einem Verfahren der eingangs geschilderten Art löst die Erfindung die gestellte Aufgabe dadurch, dass in das in Annäherung an die profilierte Innenfläche vorgeformte Mantelrohr die Werkstoffschicht der Auskleidung eingebracht wird, bevor das vorgeformte Mantelrohr mit der Werkstoffschicht der Auskleidung über den die profilierte Innenfläche des Werkstücks bestimmenden Dorn geschmiedet wird.Starting from a method of the type described above, the invention solves the stated object in that the material layer of the lining is introduced into the preformed in approaching the profiled inner surface of the casing, before the preformed casing tube with the material layer of the lining over the profiled inner surface of the workpiece forcing the mandrel.

Da zufolge dieser Maßnahmen ein Mantelrohr mit einer an die profilierte Innenfläche des Werkstücks angenäherten Profilform vorbereitet wird, in das eine die spätere Auskleidung ergebende Werkstoffschicht eingebracht wird, kann durch ein anschließendes gemeinsames Kaltschmieden des vorgeformten Mantelrohrs und der in das Mantelrohr eingebrachten Werkstoffschicht über einen entsprechend der profilierten Innenfläche des Werkstücks profilierten Dorn nicht nur eine metallurgisch vorteilhafte, innige Verbindung zwischen dem Mantelrohr und der Auskleidung erreicht, sondern auch eine hohe Formgenauigkeit für die profilierte Innenfläche des hohlen Werkstücks erzielt werden, ohne eine Nachbearbeitung dieser Innenfläche in Kauf nehmen zu müssen. Hinsichtlich der Profilierung ist somit lediglich das mögliche Schmieden über einen Dorn vorauszusetzen.Since, according to these measures, a jacket tube is prepared with an approximated to the profiled inner surface of the workpiece profile shape, in which a later lining resulting material layer is introduced, by a subsequent common cold forging the preformed jacket tube and introduced into the casing material layer via a corresponding profiled inner surface of the workpiece profiled mandrel not only a metallurgically advantageous, intimate Achieved connection between the jacket tube and the lining, but also a high dimensional accuracy for the profiled inner surface of the hollow workpiece can be achieved without having to accept a post-processing of this inner surface. With regard to the profiling, therefore, only the possible forging via a mandrel is to be assumed.

Damit auch bei sonst ungünstigen Werkstoffzusammensetzungen ein inniger Verbund zwischen dem Mantelrohr und der Werkstoffschicht der Auskleidung erzielt werden kann, kann das Mantelrohr und die Werkstoffschicht der Auskleidung zunächst durch eine Warmverformung über einen Dorn zu einem Verbundkörper verbunden werden, bevor der Verbundkörper durch ein Kaltschmieden über den die profilierte Innenfläche bestimmenden Dorn zum Werkstück geformt wird. Durch die Warmverformung des Mantelkörpers gemeinsam mit der in das Mantelrohr eingebrachten Werkstoffschicht der Auskleidung wird einerseits eine metallurgisch vorteilhafte Verbundwirkung zwischen den metallischen Werkstoffen des Mantelrohrs und der Auskleidung erreicht und anderseits ein zusätzlicher Schritt der Vorformung in Annäherung an die profilierte Innenfläche des herzustellenden Werkstücks ermöglicht. Dies bedeutet, dass durch die Kaltverformung größere örtliche Verlagerungen der Werkstoffschicht gegenüber der profilierten Innenfläche des Mantelrohrs unterbunden werden und durch die Kaltverformung lediglich die genaue profilierte Innenfläche des Werkstücks sicherzustellen ist.Thus, even with otherwise unfavorable material compositions, an intimate bond between the casing tube and the material layer of the lining can be achieved, the casing tube and the material layer of the lining can be first connected by a hot deformation through a mandrel into a composite body before the composite body by a cold forging over the the profiled inner surface defining mandrel is formed to the workpiece. The hot deformation of the jacket body together with the material layer of the lining introduced into the jacket tube on the one hand achieves a metallurgically advantageous bonding effect between the metallic materials of the jacket tube and the lining and, on the other hand, enables an additional step of preforming in approximation to the profiled inner surface of the workpiece to be produced. This means that the cold deformation of larger local displacements of the material layer relative to the profiled inner surface of the casing tube are prevented and is to ensure the cold worked only the exact profiled inner surface of the workpiece.

Die Werkstoffschicht der Auskleidung kann in unterschiedlicher Weise in das vorgeformte Mantelrohr eingebracht werden, da es lediglich auf eine im Wesentlichen gleichmäßige Verteilung der Werkstoffschicht der Auskleidung über die vorprofilierte Innenfläche des Mantelrohrs ankommt. Die Werkstoffschicht der Auskleidung kann daher beispielsweise durch ein Sprühen, Spritzen oder Gießen und dgl. auf die vorgeformte Innenfläche des Mantelrohrs aufgebracht werden. Es ist aber auch möglich, diese Werkstoffschicht in Form einer federnd vorgespannten Drahtwendel in das Mantelrohr einzuführen, um nach dem Einführen der Drahtwendel ein Anlegen der Drahtwindungen an die vorgeformte Innenfläche des Mantelrohrs unter der federnden Vorspannung zu erreichen. Besonders einfache Herstellungsbedingungen ergeben sich allerdings, wenn die Werkstoffschicht der Auskleidung in Form eines vorgeformten Auskleidungsrohrs in das vorgeformte Mantelrohr eingebracht wird, weil in diesem Fall die Auskleidung als Auskleidungsrohr außerhalb des Mantelrohrs vorgefertigt werden kann und nach dem Einbringen des Auskleidungsrohrs in das Mantelrohr lediglich das Mantelrohr mit dem Auskleidungsrohr über einen Dorn unter einer hohen Maßgenauigkeit zu einem Verbundkörper geschmiedet zu werden braucht.The material layer of the lining can be introduced in different ways into the preformed jacket tube, since it only depends on a substantially uniform distribution of the material layer of the lining over the pre-profiled inner surface of the jacket tube. The material layer of the lining can therefore be applied for example by spraying, spraying or casting and the like. On the preformed inner surface of the jacket tube. But it is also possible to introduce this layer of material in the form of a resiliently biased wire helix in the jacket tube, after insertion of the wire helix, applying the wire windings to the preformed inner surface of the jacket tube under the to achieve resilient bias. Particularly simple production conditions, however, arise when the material layer of the lining is introduced in the form of a preformed liner tube in the preformed jacket tube, because in this case the lining can be prefabricated as a liner tube outside the jacket tube and after the introduction of the liner tube into the jacket tube, only the jacket tube with the liner pipe needs to be forged over a mandrel with a high dimensional accuracy to a composite body.

Anhand der Zeichnung wird das erfindungsgemäße Verfahren näher erläutert.Reference to the drawing, the inventive method is explained in detail.

Es zeigen

Fig. 1
ein erfindungsgemäßes, hohles Werkstück ausschnittsweise in einem Längsschnitt,
Fig. 2
das Werkstück nach Fig. 1 in einem Schnitt nach der Linie II-II der Fig. 1,
Fig. 3
ein vorgeformtes Mantelrohr zur Herstellung eines Werkstücks nach Fig. 1 in einem Längsschnitt,
Fig. 4
einen Schnitt nach der Linie IV-IV der Fig. 3,
Fig. 5
ein vorgeformtes Auskleidungsrohr für ein Mantelrohr gemäß den Fig. 3 und 4 in einem Längsschnitt,
Fig. 6
einen Schnitt nach der Linie VI-VI der Fig. 5,
Fig. 7
das Mantelrohr nach der Fig. 3 mit dem Auskleidungsrohr gemäß der Fig. 5 in einem Längsschnitt und
Fig. 8
einen Schnitt nach der Linie VIII-VIII der Fig. 7.
Show it
Fig. 1
a hollow workpiece according to the invention in sections in a longitudinal section,
Fig. 2
the workpiece after Fig. 1 in a section along the line II-II of Fig. 1 .
Fig. 3
a preformed jacket tube for the production of a workpiece Fig. 1 in a longitudinal section,
Fig. 4
a section along the line IV-IV of Fig. 3 .
Fig. 5
a preformed liner pipe for a casing pipe according to 3 and 4 in a longitudinal section,
Fig. 6
a section along the line VI-VI of Fig. 5 .
Fig. 7
the casing after the Fig. 3 with the lining pipe according to the Fig. 5 in a longitudinal section and
Fig. 8
a section along the line VIII-VIII of Fig. 7 ,

Das Werkstück gemäß der schematischen Darstellung nach den Fig. 1 und 2, beispielsweise ein Gehäuse, weist einen Mantel 1 mit einer profilierten Innenfläche 2 sowie eine Auskleidung 3 auf, die der profilierten Innenfläche 2 des Mantels 1 folgt und somit eine der profilierten Innenfläche 2 des Mantels 1 entsprechende Innenfläche 4 des Werkstücks bildet. Zur Herstellung eines solchen Werkstücks kann gemäß der Fig. 4 von einem strichpunktiert angedeuteten metallischen Mantelrohr 5 ausgegangen werden, das in Annäherung an die profilierte Innenfläche 2 des Mantels 1 beispielsweise durch ein Warmschmieden vorgeformt wurde und demnach eine an die profilierte Innenfläche 2 des Mantels 1 angenähert vorprofilierte Innenfläche 6 aufweist. Die für die Auskleidung 3 vorgesehene Werkstoffschicht wird in Form eines Auskleidungsrohrs 7 vorgefertigt, das gemäß den Fig. 5 und 6 eine ebenfalls an die in profilierte Innenfläche 2 des Mantels 1 angenäherte Vorform besitzt. Das vorgeformte Auskleidungsrohr 7 und das vorgeformte Mantelrohr 5 können somit entsprechend den Fig. 7 und 8 ineinandergesteckt werden, um anschließend gemeinsam durch ein Kaltschmieden über einen Dorn zum Verbundkörper des Werkstücks entsprechend den Fig. 1 und 2 umgeformt zu werden.The workpiece according to the schematic representation of the Fig. 1 and 2 , For example, a housing, has a jacket 1 with a profiled inner surface 2 and a lining 3, which follows the profiled inner surface 2 of the shell 1 and thus forms one of the profiled inner surface 2 of the shell 1 corresponding inner surface 4 of the workpiece. For producing such a workpiece, according to the Fig. 4 be assumed by a dash-dotted lines indicated metallic casing 5, which in approximation to the profiled inner surface 2 of the shell 1, for example by hot forging has been preformed and accordingly has an inner surface 6, which is approximately pre-profiled to the profiled inner surface 2 of the jacket 1. The intended for the lining 3 material layer is prefabricated in the form of a lining tube 7, according to the FIGS. 5 and 6 also has an approximated to the profiled inner surface 2 of the shell 1 preform. The preformed liner tube 7 and the preformed jacket tube 5 can thus according to the FIGS. 7 and 8 nested together to then together by cold forging over a mandrel to the composite body of the workpiece according to the Fig. 1 and 2 to be transformed.

Da die Gefahr besteht, dass das Auskleidungsrohr 7 beim gemeinsamen Kaltschmieden zusammen mit dem Mantelrohr 5 eine örtliche Verlagerung gegenüber dem Mantelrohr 5 erfährt, ist es unter Umständen vorteilhaft, die Reibungsverhältnisse zwischen dem Mantelrohr 5 und dem eingeschobenen Auskleidungsrohr 7 zu vergrößern. Eine andere Möglichkeit besteht darin, vor der Kaltverformung eine Warmverformung zur innigen Verbindung des Mantelrohrs 5 und des Auskleidungsrohrs 7 zu einem Verbundkörper vorzusehen, um einer solchen örtlichen Verlagerung der Werkstoffschicht der Auskleidung gegenüber dem Mantelrohr vorzubeugen.Since the risk exists that the lining tube 7 experiences a local displacement relative to the jacket tube 5 during joint cold forging together with the jacket tube 5, it may be advantageous to increase the friction conditions between the jacket tube 5 and the inserted lining tube 7. Another possibility is to provide a thermoforming for the intimate connection of the jacket tube 5 and the lining tube 7 to a composite body prior to cold working to prevent such a local displacement of the material layer of the liner relative to the jacket tube.

Obwohl das Einbringen der Werkstoffschicht der Auskleidung 3 durch ein Auskleidungsrohr 7 besonders einfache Herstellungsbedingungen schafft, ist die Erfindung nicht auf ein solches Einbringen der Werkstoffschicht in das vorgeformte Mantelrohr 5 gebunden, es kommt ja lediglich darauf an, für das gemeinsame Schmieden des Mantelrohrs 5 und der Auskleidung 3 eine entsprechende Werkstoffschicht der Auskleidung 3 innerhalb des Mantelrohrs 5 vorzusehen, was beispielsweise durch ein Spritzen oder Gießen einer entsprechenden Werkstoffschicht auf die vorprofilierte Innenfläche 6 des Mantelrohrs 5 erreicht werden kann. Das Einbringen einer entsprechenden Werkstoffschicht der Auskleidung 3 kann somit auf jede Art vorgenommen werden, die ein anschließendes gemeinsames Schmieden des Mantelrohrs 5 und der eingebrachten Werkstoffschicht der Auskleidung 3 über einen profilierten Dorn erlaubt.Although the introduction of the material layer of the lining 3 by a lining tube 7 creates particularly simple production conditions, the invention is not bound to such introduction of the material layer in the preformed jacket tube 5, it depends only on, for the common forging of the jacket tube 5 and Lining 3 provide a corresponding material layer of the lining 3 within the casing tube 5, which can be achieved for example by spraying or casting a corresponding material layer on the pre-profiled inner surface 6 of the casing tube 5. The introduction of a corresponding layer of material of the liner 3 can thus be made in any way that a subsequent common forging of the jacket tube. 5 and the introduced material layer of the liner 3 allowed over a profiled mandrel.

Ist beim gemeinsamen Schmieden des Mantelrohrs 5 und der eingebrachten Werkstoffschicht der Auskleidung 3 mit einem ungleichmäßigen Fließen des Werkstoffs im Bereich der Werkstoffschicht der Auskleidung 3 zu rechnen, so kann zur Einhaltung einer gleichmäßigen Dicke der Auskleidung 3 des fertigen Werkstücks dieses ungleichmäßige Werkstofffließen im Bereich der Auskleidung 3 durch das Einbringen der Werkstoffschicht mit entsprechenden Dickenunterschieden berücksichtigt werden, sodass nach dem für die Fertigstellung des Werkstücks erforderlichen Kaltschmieden eine einheitlich dicke Auskleidung 3 erreicht wird.If, during joint forging of the jacket tube 5 and the introduced material layer of the lining 3, uneven flow of the material in the region of the material layer of the lining 3 is to be expected, this non-uniform material can flow in the region of the lining in order to maintain a uniform thickness of the lining 3 of the finished workpiece 3 be taken into account by introducing the material layer with corresponding thickness differences, so that after the cold forging required for the completion of the workpiece, a uniformly thick lining 3 is achieved.

Claims (3)

  1. Method for producing hollow metallic workpieces having a profiled inner surface (4) from a peripheral tube (5) having a profiled inner surface (2) and a lining (3) following the profiled inner surface (2) and made of a material layer forming a composite with the material of the peripheral tube (5), wherein the peripheral tube (5) is forged over a mandrel, characterised in that the peripheral tube (5) has an inner surface (6) which is pre-profiled to approximate the profiled inner surface (2) of the peripheral tube (5), and in a further step the material layer of the lining (3) is introduced into the peripheral tube (5) preformed to approximate the profiled inner surface (2), before the preformed peripheral tube (5) with the material layer of the lining (3) is forged over the mandrel determining the profiled inner surface (4) of the workpiece.
  2. Method as claimed in claim 1, characterised in that the peripheral tube (5) and the material layer of the lining (3) are initially connected by thermoforming over a mandrel to form a composite body before the composite body is formed into the workpiece by cold forging over the mandrel determining the profiled inner surface (4).
  3. Method as claimed in claim 1 or 2, characterised in that the material layer of the lining (3) is introduced into the preformed peripheral tube (5) in the form of a preformed lining tube (7).
EP16201891.5A 2015-12-15 2016-12-02 Method of making hollow metallic workpieces Active EP3181250B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATA51067/2015A AT518129B1 (en) 2015-12-15 2015-12-15 Method for producing hollow metallic workpieces

Publications (2)

Publication Number Publication Date
EP3181250A1 EP3181250A1 (en) 2017-06-21
EP3181250B1 true EP3181250B1 (en) 2019-09-18

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Application Number Title Priority Date Filing Date
EP16201891.5A Active EP3181250B1 (en) 2015-12-15 2016-12-02 Method of making hollow metallic workpieces

Country Status (4)

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EP (1) EP3181250B1 (en)
AT (1) AT518129B1 (en)
ES (1) ES2760949T3 (en)
MX (1) MX2016016264A (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE947063C (en) * 1941-12-28 1956-08-09 Gustav Appel Maschinenfabrik Process for the production of multilayer pipes on hammering machines and multilayer pipes
AU1928599A (en) * 1997-12-18 1999-07-05 Baker Hughes Incorporated Methods of making stators for moineau pumps
US7921590B2 (en) * 2006-02-23 2011-04-12 Strum, Ruger & Company, Inc. Composite firearm barrel reinforcement
BR102013021662A2 (en) * 2013-08-23 2014-09-02 Vallourec Tubos Do Brasil S A COATED MULTI-LAYER PIPE

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
MX2016016264A (en) 2018-06-07
EP3181250A1 (en) 2017-06-21
AT518129B1 (en) 2019-08-15
AT518129A1 (en) 2017-07-15
ES2760949T3 (en) 2020-05-18

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