EP0721816B1 - Method for the production of a hollow profile - Google Patents

Method for the production of a hollow profile Download PDF

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Publication number
EP0721816B1
EP0721816B1 EP95890011A EP95890011A EP0721816B1 EP 0721816 B1 EP0721816 B1 EP 0721816B1 EP 95890011 A EP95890011 A EP 95890011A EP 95890011 A EP95890011 A EP 95890011A EP 0721816 B1 EP0721816 B1 EP 0721816B1
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EP
European Patent Office
Prior art keywords
profile
mandrel
section
angular position
blank
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
EP95890011A
Other languages
German (de)
French (fr)
Other versions
EP0721816A1 (en
Inventor
Rupert Ing. Wieser
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.)
GFM Gesellschaft fuer Fertigungstechnik und Maschinenbau AG
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GFM Gesellschaft fuer Fertigungstechnik und Maschinenbau 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 GFM Gesellschaft fuer Fertigungstechnik und Maschinenbau AG filed Critical GFM Gesellschaft fuer Fertigungstechnik und Maschinenbau AG
Priority to DE59501906T priority Critical patent/DE59501906D1/en
Priority to AT95890011T priority patent/ATE165025T1/en
Priority to EP95890011A priority patent/EP0721816B1/en
Publication of EP0721816A1 publication Critical patent/EP0721816A1/en
Application granted granted Critical
Publication of EP0721816B1 publication Critical patent/EP0721816B1/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
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/16—Remodelling hollow bodies with respect to the shape of the cross-section
    • 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

Definitions

  • the invention relates to a method for manufacturing a hollow profile with at least two in their angular position coordinated by an inner ring shoulder from each other separate profile sections (see e.g. GB-A-789 861).
  • the invention is therefore based on the object, these deficiencies to eliminate and a process of the above Specify type that a rational interior profiling of hollow cylindrical workpieces with the highest accuracy Profile design and exact mutual angular assignment of the different profile sections.
  • the invention solves this problem in that the profile sections one after the other by pressing on a blank Appropriate mandrel profiles are formed, the first Shaping a first profile section and / or a Reference profile are formed, then the angular position of the mandrel profile used in the next shaping step aligned to form the second profile section becomes.
  • the previous one can be Difficulty in the non-cutting production of hollow profiles, the individual profile sections because of the successive Use of different mandrels or mandrel profiles easy to assign to each other in the correct angular position and elegant way, since in the course of the first shaping step a reference profile is created, on which the next profile sections aligned with respect to their angular position can be and thus also an exact angle reference to reach the first shaped profile section.
  • the inner ring shoulder shaped and this inner ring shoulder is provided with the reference profile, since here the inner ring shoulder can be used as a reference profile carrier and for the reference profile no other valuable workpiece areas must also be deformed.
  • the hollow profile 1 shown in FIGS. 1 to 3 has two profile sections 2, 3 on which by an inner ring shoulder 4 are separated from each other and in their angular position on each other form coordinated longitudinal grooves 5, 6.
  • the profile section 2 is through a drawn-in jacket region 7 of the hollow profile 1 closed to the adjacent end face 8, the profile section 3, however, extends continuously to the other End face 9 back.
  • this hollow profile 1 is a hollow cylindrical Blank 10 in successive shaping steps deformed without cutting by a forging over mandrel, whereby two mandrels are used for shaping, of which the a mandrel 11 a matched to the profile section 2 Mandrel profile 12, an adjoining mandrel extension 13 with a cross-section deviating from the circular shape and a in contrast, offset end piece 14 with a circular cross section and the other mandrel 15 a matched to the profile section 3 Mandrel profile 16 and a directional approach 17 with a have adapted to the mandrel extension 13 cross section.
  • the blank 10 is then a mandrel 11 inserted until the mandrel profile 12 and the mandrel attachment 13 lie in the axial position to the blank 10 (Fig. 4), whereupon by means of the only forged tools 18 the profile section 2 and the inner shoulder 4 are formed in the blank 10 (Fig. 5).
  • the result is Mandrel extension 13 in the area of the annular shoulder 4 a reference profile 19, which a certain angular position to the profile section 2 occupies, since the profile section and reference profile with the same mandrel 11 formed together in a forging step were.
  • the mandrel 11 is out of the blank 10 pulled out and in this from the opposite Side of the second mandrel 15 inserted until its directional approach 17 fits into the reference profile 19 of the ring shoulder 4 engages so that the directional approach 17 and the angular position oriented Mandrel profile 16 the angular position of this mandrel profile 16 to form the profile section 3 opposite the profile section 2 is adjusted (Fig. 8).
  • the Forged blank in the region of the mandrel profile 16, whereby the profile section 3 with the exactly correct angular position to Profile section 2 is formed (Fig. 9).
  • the hollow profile 1 can be by a manufacture chipless molding process, with an accurate profile design and also an exact angular alignment of the profile sections 2, 3 are guaranteed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Ceramic Products (AREA)
  • Artificial Filaments (AREA)

Abstract

Cold forming process for a hollow profile (1) with two internal profile sections (2, 3) in angular alignment separated by an internal shoulder (4), wherein the profile sections (2, 3) are formed successively by pressing a blank (10) over corresponding mandrel profiles (12, 16), a first profile section (2) and/or reference profile (19) being formed in the first operation which is used to align the angular position of the second mandril profile (16) for forming the second profile section (3) in the next operation.

Description

Die Erfindung bezieht sich auf ein Verfahren zum Herstellen eines Hohlprofils mit wenigstens zwei in ihrer Winkellage aufeinander abgestimmten, durch eine Innenringschulter voneinander getrennten Profilabschnitten (siehe z.B. GB-A-789 861).The invention relates to a method for manufacturing a hollow profile with at least two in their angular position coordinated by an inner ring shoulder from each other separate profile sections (see e.g. GB-A-789 861).

Diese zylindrischen oder leicht konischen Hohlprofile werden beispielsweise in der Steuerungstechnik als Gehäuseteile von Steuerschiebern u. dgl. verwendet und sind vor allem bei beidseitig durch Innenringschultern geschlossenen Profilabschnitten schwierig herzustellende Werkstücke, die bisher meist eine mehrteilige Bauweise verlangen. Es wurde zwar auch schon vorgeschlagen, geschlossene Hohlprofile einstückig in einer Rohform vorzufertigen und dann durch eine spanende Innenbearbeitung fertigzustellen, doch verlangt dies komplizierte Schneideinrichtungen und ausreichend große Innendurchmesser. Außerdem setzt die Herstellung der zueinander winkellagenorientierten Profilabschnitte umfangreiche Steuerungs- und Justiereinrichtungen für die Schneidwerkzeuge voraus.These are cylindrical or slightly conical hollow profiles for example in control technology as housing parts from Control spools u. Like. Used and are especially on both sides profile sections closed by inner ring shoulders workpieces that are difficult to manufacture, which have so far mostly been require multi-part construction. It has already been suggested closed hollow profiles in one piece in a raw form prefabricated and then by machining inside to complete, but this requires complicated cutting devices and sufficiently large inner diameter. Furthermore sets the manufacture of the angular position oriented to each other Extensive control and adjustment devices for the cutting tools ahead.

Der Erfindung liegt daher die Aufgabe zugrunde, diese Mängel zu beseitigen und ein Verfahren der eingangs geschilderten Art anzugeben, das eine rationelle Innenprofilierung von hohlzylindrischen Werkstücken mit höchster Genauigkeit der Profilgestaltung und exakter gegenseitiger Winkellagenzuordnung der verschiedenen Profilabschnitte ermöglicht. The invention is therefore based on the object, these deficiencies to eliminate and a process of the above Specify type that a rational interior profiling of hollow cylindrical workpieces with the highest accuracy Profile design and exact mutual angular assignment of the different profile sections.

Die Erfindung löst diese Aufgabe dadurch, daß die Profilabschnitte nacheinander durch Aufdrücken eines Rohlings auf entsprechende Dornprofile ausgeformt werden, wobei im ersten Formgebungsschritt ein erster Profilabschnitt und/oder ein Referenzprofil ausgeformt werden, an dem dann die Winkellage des im nächsten Formgebungsschritt eingesetzten Dornprofiles zur Ausformung des zweiten Profilabschnittes ausgerichtet wird. Mit diesem zweischrittigen Umformen läßt sich die bisherige Schwierigkeit bei der spanlosen Herstellung von Hohlprofilen, die einzelnen Profilabschnitte wegen des aufeinanderfolgenden Einsatzes verschiedener Dorne bzw. Dornprofile winkellagerichtig einander zuordnen zu können, auf einfache und elegante Weise beseitigen, da im Zuge des ersten Formgebungsschrittes ein Referenzprofil entsteht, an dem dann die nächsten Profilabschnitte hinsichtlich ihrer Winkellage ausgerichtet werden können und sich damit auch ein exakter Winkelbezug zum erstgeformten Profilabschnitt erreichen läßt. An sich könnte bei der Profilherstellung zuerst überhaupt nur ein Referenzprofil und dann erst in Abhängigkeit von diesem Referenzprofil die anderen Profilabschnitte ausgeformt werden, doch wird zweckmäßigerweise im ersten Formgebungsschritt das Referenzprofil gemeinsam mit dem ersten Profilabschnitt ausgeformt werden, wobei selbstverständlich das Referenzprofil ein eigenes Hilfsprofil, aber auch eines der Teilprofile des Hohlprofiles sein kann. Damit ist es nun möglich, Hohlprofile mit zueinander winkellagenorientierten Profilabschnitten, die durchaus hinterschnittene bzw. geschlossene Profilabschnitte sein können, durch Schmieden, Fließpressen od. dgl. Umformverfahren aus einem einstückigen Rohling zu fertigen, wobei dem Werkstück und der Werkstückherstellung alle Vorteile dieser Umformverfahren zugute kommen.The invention solves this problem in that the profile sections one after the other by pressing on a blank Appropriate mandrel profiles are formed, the first Shaping a first profile section and / or a Reference profile are formed, then the angular position of the mandrel profile used in the next shaping step aligned to form the second profile section becomes. With this two-step forming, the previous one can be Difficulty in the non-cutting production of hollow profiles, the individual profile sections because of the successive Use of different mandrels or mandrel profiles easy to assign to each other in the correct angular position and elegant way, since in the course of the first shaping step a reference profile is created, on which the next profile sections aligned with respect to their angular position can be and thus also an exact angle reference to reach the first shaped profile section. As such, it might be the first thing to do when making a profile only one reference profile and only then depending on the other profile sections are formed from this reference profile be, but is conveniently in the first molding step the reference profile together with the first Profile section are formed, of course the reference profile is its own auxiliary profile, but also one the partial profiles of the hollow profile can be. That’s it now possible, hollow profiles with mutually angular orientation Profile sections, the completely undercut or closed Profile sections can be by forging, Extrusion or the like. Forming process from a one-piece To manufacture blank, the workpiece and the workpiece manufacture benefit from all the advantages of this forming process come.

Besonders vorteilhaft ist es, wenn im ersten Formgebungsschritt neben dem ersten Profilabschnitt auch die Innenringschulter ausgeformt und dabei diese Innenringschulter mit dem Referenzprofil versehen wird, da hier die Innenringschulter als Referenzprofilträger nutzbar ist und für das Referenzprofil keine anderen wertvollen Werkstückbereiche zusätzlich verformt werden müssen.It is particularly advantageous if in the first shaping step in addition to the first profile section, the inner ring shoulder shaped and this inner ring shoulder is provided with the reference profile, since here the inner ring shoulder can be used as a reference profile carrier and for the reference profile no other valuable workpiece areas must also be deformed.

Werden zur Formgebung zwei verschiedene Dorne verwendet, von denen der eine zusätzlich zum Dornprofil für den ersten Profilabschnitt einen Dornansatz zur Ausformung des Rererenzprofils und gegebenenfalls ein Endstück zum Schließen des Profilabschnittes und der andere zusätzlich zum Dornprofil für den bzw. die weiteren Profilabschnitte einen in das Referenzprofil passenden Richtansatz aufweisen, kommt es zu einer besonders rationellen Verwirklichung des Verfahrens, da die beiden Dorne von entgegengesetzter Seite in das Hohlprofil eingeführt werden können und damit ein rasches Aufeinanderfolgen der einzelnen Formgebungsschritte ermöglichen. Außerdem können die einzelnen Dorne dann mit geeigneten Endstücken versehen sein, die das Ausformen von die Profilabschnitte abschließenden Ringschultern od. dgl. erlauben.If two different mandrels are used for shaping, from which one in addition to the mandrel profile for the first profile section a spike for shaping the reference profile and optionally an end piece for closing the profile section and the other in addition to the mandrel profile for the or the other profile sections into the reference profile have the right directional approach, there is a particular rational implementation of the procedure since the two mandrels be inserted into the hollow profile from the opposite side can and thus a rapid succession of the individual Allow shaping steps. In addition, the individual Mandrels can then be provided with suitable end pieces that the shaping of ring shoulders closing the profile sections or the like. Allow.

In der Zeichnung ist das erfindungsgemäße Verfahren beispielsweise näher veranschaulicht, und zwar zeigen die

Fig. 1 bis 3
ein nach dem erfindungsgemäßen Verfahren herstellbares Hohlprofil im Axialschnitt bzw. im Querschnitt nach den Linien II-II bzw. III-III der Fig. 1 und die
Fig. 4 bis 9
das Herstellungsverfahren an Hand verschiedener Ablaufphasen.
In the drawing, the method according to the invention is illustrated in more detail, for example, that show
1 to 3
a hollow profile that can be produced by the method according to the invention in axial section or in cross section according to lines II-II or III-III of FIG. 1 and FIG
4 to 9
the manufacturing process based on different phases.

Das in Fig. 1 bis 3 dargestellte Hohlprofil 1 weist zwei Profilabschnitte 2, 3 auf, die durch eine Innenringschulter 4 voneinander getrennt sind und in ihrer Winkellage aufeinander abgestimmte Längsnuten 5, 6 bilden. Der Profilabschnitt 2 ist durch einen eingezogenen Mantelbereich 7 des Hohlprofils 1 zur benachbarten Stirnseite 8 hin geschlossen, der Profilabschnitt 3 hingegen erstreckt sich durchgehend bis zur anderen Stirnseite 9 hin.The hollow profile 1 shown in FIGS. 1 to 3 has two profile sections 2, 3 on which by an inner ring shoulder 4 are separated from each other and in their angular position on each other form coordinated longitudinal grooves 5, 6. The profile section 2 is through a drawn-in jacket region 7 of the hollow profile 1 closed to the adjacent end face 8, the profile section 3, however, extends continuously to the other End face 9 back.

Zur Herstellung dieses Hohlprofils 1 wird ein hohlzylindrischer Rohling 10 in aufeinanderfolgenden Formgebungsschritten spanlos durch ein Schmieden über Dorn verformt, wobei zur Formgebung zwei Dorne verwendet werden, von denen der eine Dorn 11 ein auf den Profilabschnitt 2 abgestimmtes Dornprofil 12, einen daran anschließenden Dornansatz 13 mit einem von der Kreisform abweichenden Querschnitt und ein demgegenüber abgesetztes Endstück 14 mit Kreisquerschnitt sowie der andere Dorn 15 ein auf den Profilabschnitt 3 abgestimmtes Dornprofil 16 und einen Richtansatz 17 mit einem an den Dornansatz 13 angepaßten Querschnitt aufweisen.To produce this hollow profile 1 is a hollow cylindrical Blank 10 in successive shaping steps deformed without cutting by a forging over mandrel, whereby two mandrels are used for shaping, of which the a mandrel 11 a matched to the profile section 2 Mandrel profile 12, an adjoining mandrel extension 13 with a cross-section deviating from the circular shape and a in contrast, offset end piece 14 with a circular cross section and the other mandrel 15 a matched to the profile section 3 Mandrel profile 16 and a directional approach 17 with a have adapted to the mandrel extension 13 cross section.

Im ersten Formgebungsschritt wird nun in den Rohling 10 der eine Dorn 11 eingeführt, bis das Dornprofil 12 und der Dornansatz 13 in axiallagerichtiger Position zum Rohling 10 liegen (Fig. 4), worauf mittels der nur angedeuteten Schmiedewerkzeuge 18 der Profilabschnitt 2 und die Innenschulter 4 im Rohling 10 ausgeformt werden (Fig. 5). Dabei ergibt der Dornansatz 13 im Bereich der Ringschulter 4 ein Referenzprofil 19, das eine bestimmte Winkellage zum Profilabschnitt 2 einnimmt, da ja Profilabschnitt und Referenzprofil mit dem gleichen Dorn 11 in einem Schmiedeschritt gemeinsam ausgeformt wurden. Nun wird der Rohling 10 und der Dorn 11 relativ zueinander soweit bewegt, daß das Dornendstück 14 und der zur Stirnseite 8 des Rohlings 10 hin verbleibende Mantelbereich zwischen den Hämmern 17 liegen (Fig. 6), und der eingezogene Mantelbereich 7 kann im Rohling 10 ausgeformt und damit der Profilabschnitt 2 geschlossen werden (Fig. 7).In the first shaping step, the blank 10 is then a mandrel 11 inserted until the mandrel profile 12 and the mandrel attachment 13 lie in the axial position to the blank 10 (Fig. 4), whereupon by means of the only forged tools 18 the profile section 2 and the inner shoulder 4 are formed in the blank 10 (Fig. 5). The result is Mandrel extension 13 in the area of the annular shoulder 4 a reference profile 19, which a certain angular position to the profile section 2 occupies, since the profile section and reference profile with the same mandrel 11 formed together in a forging step were. Now the blank 10 and the mandrel 11 become relative moved to each other so far that the mandrel end piece 14 and the jacket area remaining towards the front side 8 of the blank 10 lie between the hammers 17 (Fig. 6), and the indented jacket area 7 can be formed in the blank 10 and thus the profile section 2 are closed (Fig. 7).

Im nächsten Formgebungsschritt ist der Dorn 11 aus dem Rohling 10 herausgezogen und in diesen von der gegenüberliegenden Seite der zweite Dorn 15 eingeführt, bis dessen Richtansatz 17 passend in das Referenzprofil 19 der Ringschulter 4 eingreift, so daß über den Richtansatz 17 und dem dazu winkellageorientierten Dornprofil 16 die Winkellage dieses Dornprofils 16 zur Ausformung des Profilabschnittes 3 gegenüber dem Profilabschnitt 2 justiert ist (Fig. 8). Nun wird der Rohling im Bereich des Dornprofils 16 abgeschmiedet, wodurch der Profilabschnitt 3 mit der genau richtigen Winkellage zum Profilabschnitt 2 entsteht (Fig. 9).In the next shaping step, the mandrel 11 is out of the blank 10 pulled out and in this from the opposite Side of the second mandrel 15 inserted until its directional approach 17 fits into the reference profile 19 of the ring shoulder 4 engages so that the directional approach 17 and the angular position oriented Mandrel profile 16 the angular position of this mandrel profile 16 to form the profile section 3 opposite the profile section 2 is adjusted (Fig. 8). Now the Forged blank in the region of the mandrel profile 16, whereby the profile section 3 with the exactly correct angular position to Profile section 2 is formed (Fig. 9).

Auf rationelle Weise läßt sich so das Hohlprofil 1 durch einen spanlosen Formgebungsprozeß herstellen, wobei eine genaue Profilgestaltung und auch eine exakte Winkelausrichtung der Profilabschnitte 2, 3 gewährleistet sind.In a rational manner, the hollow profile 1 can be by a manufacture chipless molding process, with an accurate profile design and also an exact angular alignment of the profile sections 2, 3 are guaranteed.

Claims (3)

  1. A method of producing a hollow profile (1) having at least two profile portions (2, 3) adapted to one another in their angular position and separated from one another by an inner annular shoulder (4), characterised in that the profile portions (2, 3) are formed successively by pressing a blank (10) on to corresponding mandrel profiles (12, 16), a first profile portion (2) and/or a reference profile (19) being formed in the first shaping step, the angular position of the mandrel profile (16) used in the next shaping step then being aligned by reference to the first profile portion (2) and/or reference profile (19) in order to form the second profile portion (3).
  2. A method according to claim 1, characterised in that the inner annular shoulder (4) is also formed in the first shaping step in addition to the first profile portion (2) and the inner annular shoulder (4) is provided with the reference profile (19) during this.
  3. A method according to claim 1 or 2, characterised in that two different mandrels (11, 15) are used for the shaping operations, one of which (11) has in addition to the mandrel profile (12) for the first profile portion (2) a mandrel attachment (13) for forming the reference profile (19) and, if required, an end part (14) to close the profile portion (2), and the other (15) has in addition to the mandrel profile (16) for the profile portion (13) or additional profile portions (13) an alignment attachment (17) fitting into the reference profile (19).
EP95890011A 1995-01-13 1995-01-13 Method for the production of a hollow profile Expired - Lifetime EP0721816B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59501906T DE59501906D1 (en) 1995-01-13 1995-01-13 Process for producing a hollow profile
AT95890011T ATE165025T1 (en) 1995-01-13 1995-01-13 METHOD FOR PRODUCING A HOLLOW PROFILE
EP95890011A EP0721816B1 (en) 1995-01-13 1995-01-13 Method for the production of a hollow profile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95890011A EP0721816B1 (en) 1995-01-13 1995-01-13 Method for the production of a hollow profile

Publications (2)

Publication Number Publication Date
EP0721816A1 EP0721816A1 (en) 1996-07-17
EP0721816B1 true EP0721816B1 (en) 1998-04-15

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ID=8222174

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95890011A Expired - Lifetime EP0721816B1 (en) 1995-01-13 1995-01-13 Method for the production of a hollow profile

Country Status (3)

Country Link
EP (1) EP0721816B1 (en)
AT (1) ATE165025T1 (en)
DE (1) DE59501906D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104722701A (en) * 2013-12-20 2015-06-24 大众汽车有限公司 Method and device for producing hollow shaft through radial deformation, and hollow shaft

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1062500C (en) * 1996-05-17 2001-02-28 曾绍谦 Hollow-shaping forging process for metal tube
DE19827191A1 (en) * 1998-06-18 1999-12-23 Volkswagen Ag Method for producing an inner profile of a sleeve-like metallic outer part and / or for producing an outer profile of a metallic inner part by kneading
AT501152B8 (en) * 2003-12-30 2007-02-15 Gfm Beteiligungs & Man Gmbh METHOD AND DEVICE FOR PRODUCING A CYLINDRICAL HOLLOW BODY FROM A BOARD
DE102013112123B4 (en) 2013-11-04 2019-09-05 Metaldyne Gmbh Metal sleeve and method for its production

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB789861A (en) * 1955-09-14 1958-01-29 Ingersoll Rand Canada Improvements in method of forming gun barrels
SE435907B (en) * 1981-02-03 1984-10-29 Ffv Affersverket DORN FOR MANUFACTURE OF INTERNAL THROUGH PIPES OR SHELTS

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104722701A (en) * 2013-12-20 2015-06-24 大众汽车有限公司 Method and device for producing hollow shaft through radial deformation, and hollow shaft
DE102013226929A1 (en) * 2013-12-20 2015-06-25 Volkswagen Aktiengesellschaft Method and device for producing a hollow shaft by radial forming and hollow shaft produced therewith

Also Published As

Publication number Publication date
ATE165025T1 (en) 1998-05-15
EP0721816A1 (en) 1996-07-17
DE59501906D1 (en) 1998-05-20

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