EP0895819B1 - Method and apparatus for forming a connecting portion on a hollow profile - Google Patents

Method and apparatus for forming a connecting portion on a hollow profile Download PDF

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Publication number
EP0895819B1
EP0895819B1 EP98113750A EP98113750A EP0895819B1 EP 0895819 B1 EP0895819 B1 EP 0895819B1 EP 98113750 A EP98113750 A EP 98113750A EP 98113750 A EP98113750 A EP 98113750A EP 0895819 B1 EP0895819 B1 EP 0895819B1
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EP
European Patent Office
Prior art keywords
hollow section
die
pressure
forming
hollow profile
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
EP98113750A
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German (de)
French (fr)
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EP0895819A1 (en
Inventor
Pierre Bonny
Thomas Hülsberg
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.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
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Publication date
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Publication of EP0895819A1 publication Critical patent/EP0895819A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/24—Making other particular articles nuts or like thread-engaging members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/10—Stamping using yieldable or resilient pads
    • B21D22/105—Stamping using yieldable or resilient pads of tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/035—Deforming tubular bodies including an additional treatment performed by fluid pressure, e.g. perforating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49428—Gas and water specific plumbing component making
    • Y10T29/49442—T-shaped fitting making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49805—Shaping by direct application of fluent pressure

Definitions

  • the invention has for its object a generic To further develop a method and a generic device, that the training of a space-saving for a later assembly in a correct position and with respect to the contour mounting connection matched to the mounting part in simple Process reliable even with the requirement of high degrees of deformation is achieved.
  • Fig. 1 is an internal high-pressure forming tool 1 of the invention Device shown, which in an upper tool 2 and a lower tool not shown here is divided.
  • the upper tool 2 has a bushing 3, which opens into the engraving 4 of the forming tool 1.
  • the implementation 3 can have any geometric cross section, is here however as a circular cylindrical guide bore educated.
  • the stamp 5 is located in FIG. 1 with its end face 7 still within the implementation 3, being within the in the Forming tool 1 inserted hollow profile 6 no internal high pressure is produced.
  • the pressure inside the pressurized fluid filled hollow profile 6 can be atmospheric pressure or a have a pressure level below the forming pressure.
  • the hollow profile 6 can also be empty. A filling can do so be of advantage that when denting the hollow profile 6 an unexpected crack of the hollow profile 6 due to an occurring leakage in a simple manner before the high pressure is applied can be detected. on the other hand the filling brings an unwanted resistance to the engraving moving punch 5 denting the hollow profile 6.
  • stamp 5 has an external thread on its circumference carries that in the course of the process as an internal thread 19 in the hollow profile wall 13 by pressing by means of internal high pressure impresses (Fig. 4).
  • the stamp 5 can be done after Production of such an assembly connection in a simple manner be unscrewed from the assembly connection.
  • the thread can be a screw thread or for a bayonet lock be trained accordingly. This makes it extremely easy Way on curved surfaces, such as the hollow profile 6, without intermediate part and complex welding or gluing work durable screw connections are formed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Clamps And Clips (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer Montageanbindung an einem Hohlprofil nach dem Oberbegriff des Patentanspruches 1 und eine Vorrichtung zur Durchführung des Verfahrens nach dem Oberbegriff des Patentanspruches 6.The invention relates to a method for producing a mounting connection on a hollow profile according to the preamble of the claim 1 and an apparatus for performing the method according to the preamble of claim 6.

Ein gattungsgemäßes Verfahren bzw. eine gattungsgemäße Vorrichtung ist aus der DE 41 03 083 C1 bekannt. Darin wird ein Metallrohr-Abzweig beschrieben, der mittels Innenhochdruckumformens hergestellt wird. Hierbei werden gleichzeitig teilkreiszylindrische Ausstülpungen mit ebenen Montageflächen für die Anordnung jeweils einer Lambda-Sonde ausgeformt. Derartige ausgestülpte Montageflächen sind infolge der Innenhochdruckumformung zwar für den jeweiligen Anwendungszweck genau lagegerecht ausgebildet, erfordern jedoch zusätzlichen Bauraum, der bei engen Bauverhältnissen unerwünscht ist. Des weiteren können zwar auf das zu montierende Teil präzise abgestimmte Montageflächen erzeugt werden, jedoch ist das dafür speziell ausgeformte Umformwerkzeug in seiner Herstellung sehr aufwendig und durch seine Ausformung auf eine ganz bestimmte Art von Montageflächen ein für allemal festgelegt und daher für die Ausbildung verschiedenartig zu gestaltender Montageflächen gänzlich ungeeignet. Weiterhin ist die Herstellung von Montageflächen, die hohe Umformgrade am Hohlprofil erfordern, prozeßsicher nicht möglich, da durch das reine Aufweiten die Dehnfähigkeit des Hohlprofilmaterial bald überschritten ist, wobei das Hohlprofil dann birst. A generic method or a generic device is known from DE 41 03 083 C1. In it is a metal pipe branch described by means of hydroforming will be produced. Here are partially circular cylindrical Protrusions with flat mounting surfaces for arrangement each formed a lambda probe. Such turned out Mounting surfaces are due to the internal high pressure forming trained precisely for the respective application, however, require additional installation space that is narrow Construction is undesirable. Furthermore, although on the part to be assembled creates precisely coordinated assembly surfaces are, however, is the specially shaped forming tool very complex to manufacture and through its Forming on a specific type of mounting surface fixed for all and therefore different for training assembly surfaces to be designed completely unsuitable. Furthermore, the production of assembly surfaces, the high degrees of deformation required on the hollow profile, not reliably possible, because the expansion of the hollow profile material due to the pure expansion soon exceeded, the hollow profile then bursts.

Der Erfindung liegt die Aufgabe zugrunde, ein gattungsgemäßes Verfahren bzw. eine gattungsgemäße Vorrichtung dahingehend weiterzubilden, daß die Ausbildung einer bauraumsparenden für eine spätere Montage lagegerechten und bezüglich der Kontur exakt auf das Montageteil abgestimmten Montageanbindung in einfacher Weise selbst mit dem Erfordernis hoher Umformgrade prozeßsicher erreicht wird.The invention has for its object a generic To further develop a method and a generic device, that the training of a space-saving for a later assembly in a correct position and with respect to the contour mounting connection matched to the mounting part in simple Process reliable even with the requirement of high degrees of deformation is achieved.

Die Aufgabe ist erfindungsgemäß durch die Merkmale des Patentanspruches 1 hinsichtlich des Verfahrens und durch die Merkmale des Patentanspruches 6 hinsichtlich der Vorrichtung gelöst.The task is according to the invention by the features of the claim 1 regarding the procedure and the characteristics of claim 6 solved with respect to the device.

Dank der Erfindung wird eine in das Hohlprofil eingesenkte Anbindung für die Montage geschaffen, wodurch das Erfordernis eines zusätzlichen Bauraumes zum Fügen des Hohlprofiles mit einem Montageteil nicht anfällt, so daß die Montage extrem bauraumsparend ausführbar ist. Aufgrund des Innenhochdruck-Umformverfahrens wird die Anbindungsstelle des Hohlprofils bezüglich ihrer Relativlage toleranzfrei gebildet und in der Konturierung durch eine entsprechende Ausbildung des Stempels in Zusammenwirkung mit dem Innenhochdruck quasi formnegativ auf die Verbindungsstelle des Montageteils in vorteilhafter Weise abgestimmt, wobei eine sichere, haltbare Fügeverbindung zwischen dem Hohlprofil und dem Montageteil erzielt wird, bei der ein optimaler Formschluß und somit eine für die Fügeverbindung optimale paßgenaue Anlage der beiden Fügepartner, des Hohlprofiles und des Montageteils, aneinander besteht. Durch die Verwendung eines Stempels für die Ausformung der Anbindungsstelle wird die Herstellungsvorrichtung für diese wesentlich flexibilisiert, da durch den einfachen Austausch des Stempels mannigfaltige Anbindungstellen ausgeformt werden können ohne daß ein vollkommen neues Umformwerkzeug erforderlich ist. Auch ist der einfache Austausch eines abgenutzten Stempels für einen neuwertigen in der Kostenbetrachtung erheblich günstiger als die Nacharbeitung eines ganzen Werkzeuges oder gar als der Ersatz des gebrauchten Werkzeuges durch ein neues. Durch die Erfindung können auch Anbindungsstellen am Hohlprofil mit hohen Umformgraden hergestellt werden, da durch das Einbeulen eine günstige Vorverformung des Hohlprofiles erreicht wird, bei der auch Bereiche des Hohlprofiles, die ursprünglich vor der Einbeulung von der Anbindungsstelle weiter abgelegen sind, durch das Einbeulen zu dieser Stelle eingezogen werden, so daß für die Endausformung mittels Innenhochdruck genügend Hohlprofilmaterial vorhanden ist. Des weiteren ist das dadurch zusätzlich erhaltene Material schon vor der Innenhochdruckbeaufschlagung in Richtung der Hohlprofilmitte gedrückt, so daß der Stempel allein durch das Einbeulen von der Hohlprofilwandung in einer der Endform der Montageanbindung angenäherten Grobform umgeben ist. Durch den Innenhochdruck muß dann lediglich die endgültige Anlage des Hohlprofilmaterials am in dieser Einbeulstellung verharrenden Stempel erbracht werden. Dazu werden jedoch nur geringe Umformgrade benötigt, wobei damit insgesamt ein Versagen des Hohlprofilmaterials in Form eines Berstens vermieden wird. Somit ergibt die Erfindung ein Verfahren, durch das die Herstellung einer derartigen in das Hohlprofil eingesenkten Montageanbindung in einfacher Weise prozeßsicher erfolgen kann.Thanks to the invention, a connection is countersunk into the hollow profile created for assembly, eliminating the need for a additional space for joining the hollow profile with a Mounting part does not occur, so that the installation extremely space-saving is executable. Due to the hydroforming process becomes the connection point of the hollow profile with respect to their Relative position formed tolerance-free and in the contouring through appropriate training of the stamp in cooperation with the internal high pressure quasi-negative on the connection point of the assembly part in an advantageous manner, being a secure, durable joint between the hollow profile and the mounting part is achieved in which a optimal form fit and thus an optimal one for the joint connection precise fit of the two joining partners, the hollow profile and the mounting part, exists together. By using it a stamp for the formation of the connection point the manufacturing device is made considerably more flexible for this, as varied by simply replacing the stamp Connection points can be formed without a completely new forming tool is required. That too is easy replacement of a worn stamp for a new one in terms of costs considerably cheaper than that Reworking an entire tool or even as a replacement of the used tool with a new one. By the invention can also connect points on the hollow profile with high degrees of deformation be made, because the denting a cheap Pre-deformation of the hollow profile is achieved, including areas of the hollow profile, which was originally before the dent further away from the connection point, due to the dent be drafted in at this point, so that for the Final shaping by means of internal high pressure enough hollow profile material is available. Furthermore, this is additionally obtained Material before the high pressure is applied Pressed towards the center of the hollow profile so that the stamp alone by denting the hollow profile wall in one of the Final shape of the assembly connection is roughly surrounded. Due to the internal high pressure, only the final system has to be used of the hollow profile material on the one remaining in this dent position Stamps are provided. However, this will only be minor Degrees of deformation required, with a total failure the hollow profile material in the form of bursting is avoided. Thus, the invention provides a process by which the manufacture such a mounting connection countersunk into the hollow profile can be done reliably in a simple manner.

Zweckmäßige Ausgestaltungen der Erfindung können den Unteransprüchen entnommen werden; im übrigen ist die Erfindung anhand zweier in den Zeichnungen dargestellter Ausführungsbeispiele nachfolgend näher erläutert; dabei zeigt:

  • Fig. 1 in einem seitlichen Längsschnitt die erfindungsgemäße Vorrichtung mit einem eine Prägekontur aufweisenden Stempel in bezüglich der Gravur des in drucklosem Zustand befindlichen Innenhochdruck-Umformwerkzeuges in seine Durchführung zurückversetzter Lage,
  • Fig. 2 in einem seitlichen Längsschnitt den Stempel aus Fig. 1 in Einbeullage mit eingebeultem Hohlprofil in drucklosem Zustand,
  • Fig. 3 in einem seitlichen Längsschnitt den Stempel aus Fig. 1 in Einbeullage mit dem mit Innenhochdruck beufschlagten vorgebeulten Hohlprofil,
  • Fig. 4 ein Hohlprofil mit einer erfindungsgemäß ausgebildeten Montageanbindung, welche ein Innengewinde aufweist.
    • Expedient embodiments of the invention can be found in the subclaims; otherwise, the invention is explained in more detail below with reference to two exemplary embodiments shown in the drawings; shows:
  • 1 shows a lateral longitudinal section of the device according to the invention with a stamp having an embossed contour in the position set back into its implementation with respect to the engraving of the internal high-pressure forming tool which is in a depressurized state,
  • 2 in a lateral longitudinal section, the stamp from FIG. 1 in the recessed position with dented hollow profile in the depressurized state,
  • 3 in a lateral longitudinal section, the stamp from FIG. 1 in the bent-in position with the bulged hollow profile which is subjected to high internal pressure,
  • Fig. 4 is a hollow profile with a mounting connection designed according to the invention, which has an internal thread.

    • In Fig. 1 ist ein Innenhochdruck-Umformwerkzeug 1 der erfindungsgemäßen Vorrichtung dargestellt, welches in ein Oberwerkzeug 2 und ein hier nicht weiter dargestelltes Unterwerkzeug geteilt ist. Das Oberwerkzeug 2 weist eine Durchführung 3 auf, die in die Gravur 4 des Umformwerkzeuges 1 mündet. Die Durchführung 3 kann jeden beliebigen geometrischen Querschnitt besitzen, ist hier jedoch als kreiszylindrische Führungsbohrung ausgebildet.In Fig. 1 is an internal high-pressure forming tool 1 of the invention Device shown, which in an upper tool 2 and a lower tool not shown here is divided. The upper tool 2 has a bushing 3, which opens into the engraving 4 of the forming tool 1. The implementation 3 can have any geometric cross section, is here however as a circular cylindrical guide bore educated.

    In der Durchführung 3 ist ein Stempel 5 verschiebbar geführt, der rückseitig mit einem vorzugsweise hydraulischen Antrieb verbunden ist. Der Stempel 5 weist an seiner einem in der Gravur 4 eingelegten Hohlprofil 6 zugewandten Stirnseite 7 eine Prägekontur 8 auf, die die Stirnseite 7 abgerundet gestaltet und die zentrisch eine noppenartige Erhebung 9 zum Hohlprofil 6 besitzt. Der Verlauf der Prägekontur 8 kann jedoch beliebig ausgebildet sein, wobei abgerundete Konturen für das unten erläuterte Verfahren günstig sind, da keine eventuell rißverursachende scharfe Kanten auftreten. Die Prägekontur 8 muß auf alle Fälle formnegativ auf die gewünschte Kontur der zu erzeugenden Montageanbindung 10 abgestimmt sein, es sei denn, der Stempel 5 würde in einem Verfahrenszwischenschritt nach dem Einbeulen gegen einen anderen Stempel ausgetauscht, der dann die geeignete Kontur zur Ausbildung der gewünschten Montageanbindung 10 besitzt und die Einbeullage des Stempels 5 einnimmt. Somit könnte das Hohlprofil 6 mit dem abgerundeten Stempel 5 schonend eingebeult werden, wonach bei der endgültigen Formgebung der Montageanbindung 10 durch Erzeugen eines Innenhochdruckes der die Stelle des Stempels 5 einnehmende Stempel an seiner Stirnseite auch scharfkantig ausgebildet sein kann. Allerdings erfordert dieser Zwischenschritt Prozeßzeit und begründet zusätzlichen werkzeugtechnischen Aufwand und Kosten.In the implementation 3, a stamp 5 is guided, the back with a preferably hydraulic drive connected is. The stamp 5 has one engraved on it 4 inserted hollow profile 6 facing end face 7 a Embossing contour 8, which makes the end face 7 rounded and the centrally a knob-like elevation 9 to the hollow profile 6 has. However, the course of the embossed contour 8 can be as desired be formed, with rounded contours for that explained below Procedures are favorable, since none of them may cause cracks sharp edges occur. The embossing contour 8 must be on all Form negative to the desired contour of the one to be created Assembly connection 10 must be coordinated, unless the stamp 5 would counter in a procedural step after denting exchanged another stamp, which is then the appropriate one Has contour for forming the desired mounting 10 and occupies the stamp 5's leaning position. So could the hollow profile 6 with the rounded punch 5 gently dented be what after the final shaping of the assembly connection 10 by generating an internal high pressure of the Place the stamp 5 taking stamp on its front side can also be formed with sharp edges. However requires this intermediate step process time and justifies additional tooling effort and costs.

    In Fig. 1 befindet sich der Stempel 5 mit seiner Stirnseite 7 noch innerhalb der Durchführung 3, wobei innerhalb des in das Umformwerkzeug 1 eingelegten Hohlprofiles 6 noch kein Innenhochdruck erzeugt wird. Der Druck innerhalb des mit Druckfluid gefüllten Hohlprofiles 6 kann Atmosphärendruck sein oder ein unter dem Umformdruck liegendes Druckniveau besitzen. Das Hohlprofil 6 kann auch noch unbefüllt sein. Eine Befüllung kann dahingehend von Vorteil sein, daß beim Einbeulen des Hohlprofiles 6 ein wider Erwarten entstehender Riß des Hohlprofiles 6 aufgrund einer auftretenden Leckage in einfacher Weise vor der Innenhochdruckbeaufschlagung detektiert werden kann. Andererseits bringt die Befüllung einen unerwüschten Widerstand dem in Gravur fahrenden das Hohlprofil 6 einbeulenden Stempel 5 entgegen.The stamp 5 is located in FIG. 1 with its end face 7 still within the implementation 3, being within the in the Forming tool 1 inserted hollow profile 6 no internal high pressure is produced. The pressure inside the pressurized fluid filled hollow profile 6 can be atmospheric pressure or a have a pressure level below the forming pressure. The hollow profile 6 can also be empty. A filling can do so be of advantage that when denting the hollow profile 6 an unexpected crack of the hollow profile 6 due to an occurring leakage in a simple manner before the high pressure is applied can be detected. on the other hand the filling brings an unwanted resistance to the engraving moving punch 5 denting the hollow profile 6.

    Nach dem Schließen des Umformwerkzeuges 1 wird in drucklosem Zustand des Hohlprofiles 6 der Stempel 5 aus der Durchführung 3 heraus auf das Hohlprofil 6 gefahren, wobei dieses vom Stempel 5 gemäß Fig. 2 eingebeult wird. Bei der Einbeulung wird Hohlprofilmaterial aus den an die zu erzeugende Anbindungsstelle anschließenden Bereichen 11 des Hohlprofiles 6 herangezogen. Am Hohlprofil 6 bildet sich eine einwärtsgekehrte Kuppe 12 aus, wobei die Profilwandung 13 nur an den bei der Einbeulung das Hohlprofil 6 beaufschlagenden Stellen 14,15,16 des Stempels 5 anliegt. Zwischen der Hohlprofilwandung 13 und dem Stempel 5 bilden sich dabei anlagefreie Zwischenräume 17,18 aus.After closing the forming tool 1 is in depressurized State of the hollow profile 6 of the stamp 5 from the implementation 3 driven out on the hollow profile 6, this from the stamp 5 is dented according to FIG. 2. During the dent, hollow profile material is used from the connection point to be created adjoining areas 11 of the hollow profile 6. At the Hollow profile 6 forms an inward-facing crest 12, the profile wall 13 only on the at the dent Hollow profile 6 acting points 14, 15, 16 of the stamp 5 is applied. Between the hollow profile wall 13 and the stamp 5 Here, system-free spaces 17, 18 are formed.

    Im weitergehenden Verfahrensschritt nach Fig. 3 wird nun das in das Hohlprofil 6 eingeleitete Druckfluid auf Hochdruck gespannt, während der Stempel 5 in seiner Einbeulstellung verharrt. Hierbei wird der Stempel 5 rückseitig von seinem Antrieb entgegen dem Innenhochdruck abgestützt. Unter der pressenden Einwirkung des Innenhochdruckes legt sich nun die Hohlprofilwandung 13 gänzlich an den Stempel 5 umfänglich und stirnseitig an, wobei die Zwischenräume 17 und 18 verschwinden. Die Kontur der Montageanbindung 10 ist somit fertiggestellt, wobei im Bereich der Mündungsöffnung der Durchführung 3 zur Gravur 4 aus dem Eibeulvorgang resultiernde von der Gravur 4 abstehende Einzüge der Hohlprofilwandung 13 durch deren Anpressung an die Gravur 4 eingeebnet werden. Dadurch wird eine qualitativ hochwertige Außenkontur des Hohlprofiles 6 auch im Bereich der Montageanbindung 10 gewährleistet.In the further process step according to FIG. 3, the in the hollow profile 6 introduced pressurized fluid at high pressure, while the stamp 5 remains in its dent position. Here, the stamp 5 is on the back of its drive supported against the internal high pressure. Under the press The hollow profile wall is now exposed to the effects of high internal pressure 13 entirely on the stamp 5 circumferentially and on the face with the spaces 17 and 18 disappearing. The contour The assembly connection 10 is thus completed, in the area the opening of the passage 3 for engraving 4 the indentation resulting from the engraving 4 protruding indentations the hollow profile wall 13 by pressing it against the Engraving 4 can be leveled. This will be a high quality Outer contour of the hollow profile 6 also in the area of the assembly connection 10 guaranteed.

    Nach der Innenhochdruck-Umformung wird das Druckfluid entspannt und aus dem Umformwerkzeug 1 geleitet. Der Stempel 5 wird aus der Gravur 4 und damit aus der muldenförmigen Montageanbindung 10 heraus in die Durchführung 3 in den Ausgangszustand verfahren. Der Antrieb für den Stempel 5 ist dabei in dieser Phase so auszulegen, daß eine etwaige Klemmwirkung der durch den Innenhochdruck an den Umfang des Stempels 5 angepreßten Hohlprofilwandung 13 leicht überwunden werden kann. Im übrigen sollte der Stempel 5 hinsichtlich seiner Umfangs- und Stirnseitenkontur hinterschnittfrei gestaltet sein, so daß das translatorische Herausfahren aus der Montageanbindung 10 ohne Behinderung von statten gehen kann. Durch das Herausfahren des Stempels 5 wird nun die Montageanbindung 10 für die Anbringung eines Montageteils freigegeben. Das Montageteil kann selbst ein Werkstück mit Postionierungs- oder Befestigungselementen, für die die Montageanbindung entsprechend ausgebildet ist, sein wie beispielsweise eines aus der Rohbaustruktur eines Kraftfahrzeuges oder ein Fügeteil, das in die Montageanbindung 10 paßgenau eingesetzt wird.After the hydroforming, the pressure fluid is released and passed out of the forming tool 1. The stamp 5 is made the engraving 4 and thus from the trough-shaped mounting connection 10 move out into bushing 3 to the initial state. The drive for the stamp 5 is so in this phase interpret that any clamping effect caused by the internal high pressure pressed to the circumference of the stamp 5 hollow profile wall 13 can be easily overcome. Otherwise, the Stamp 5 in terms of its peripheral and frontal contour be designed without undercuts so that the translational Driving out of the assembly link 10 without hindrance from can go. By moving out the stamp 5 now the mounting connection 10 for attaching an assembly part Approved. The assembly part can itself be a workpiece with positioning or fastening elements for which the Mounting connection is designed accordingly, such as one from the bodyshell of a motor vehicle or a joining part, which is inserted into the mounting connection 10 with a precise fit becomes.

    Denkbar ist es auch, daß Stempel 5 an seinem Umfang ein Außengewinde trägt, das im Zuge des Verfahrens sich als Innengewinde 19 in die Hohlprofilwandung 13 durch Anpressen mittels Innenhochdruck einprägt (Fig. 4). Der Stempel 5 kann nach erfolgter Herstellung einer derartigen Montageanbindung in einfacher Weise aus der Montageanbindung herausgedreht werden. Das Gewinde kann ein Schraubgewinde sein oder für einen Bajonettverschluß entsprechend ausgebildet sein. Somit können in höchst einfacher Weise an gekrümmten Flächen, wie das Hohlprofil 6 sie aufweist, ohne Zwischenteil und aufwendige Schweiß- oder Klebearbeiten haltbare Schraubanbindungen ausgebildet werden.It is also conceivable that stamp 5 has an external thread on its circumference carries that in the course of the process as an internal thread 19 in the hollow profile wall 13 by pressing by means of internal high pressure impresses (Fig. 4). The stamp 5 can be done after Production of such an assembly connection in a simple manner be unscrewed from the assembly connection. The thread can be a screw thread or for a bayonet lock be trained accordingly. This makes it extremely easy Way on curved surfaces, such as the hollow profile 6, without intermediate part and complex welding or gluing work durable screw connections are formed.

    Denkbar ist weiterhin, vor dem Einbeulen durch den Stempel 5 einen Innenhochdruck-Umformprozeß abfolgen zu lassen, dahingehend, daß das Hohlprofil 6 in die Durchführung 3 des Stempels 5 aufgeweitet wird, wobei sich dieser weiter zurückgezogen wird und für das entstehende Nebenformelement als Gegenhalter dient. Mit der Aufweitung kann auch gleichzeitig durch zwei die Enden des Hohlprofiles 6 beaufschlagende Axialstempel axial Hohlprofilmaterial nachgeschoben werden, so daß bei der Aufweitung kein Materialversagen in Form eines Berstens des Hohlprofiles 6 auftritt. Das Nebenformelement wird dann durch den Stempel 5 wieder in die Ausgangsform des Hohlprofiles 6 zurückgedrückt. Dies kann bei Innenhochdruck, bei dem das Material des Nebenformelementes noch fließfähig ist und keine "eingefrorenen" Spannungszustände durch Kaltverfestigung aufweist, oder auch zur Entlastung der aufzubringenden Vorschubkraft für den Stempel 5 bei einem Druck, der geringer ist als der Umformdruck, geschehen. Durch den das Nebenformelement ausbildenden Verfahrensschritt wird für das nachfolgende mechanische Einbeulen Hohlprofilmaterial vorgehalten, da zur Herstellung des Nebenformelementes nicht nur das Hohlprofilwandungsstück, das die Mündungsöffnung der Durchführung 3 abdeckt, in die Durchführung 3 hineingepreßt wird, sondern auch aus den an das Wandungsstück angrenzenden Bereichen des Hohlprofiles 6 Hohlprofilmaterial in die Durchführung 3 nachfließt, was zusätzlich von dem Nachschiebevorgang forciert wird. Damit liegt beim Erfordernis hoher Umformgrade im Einbeulvorgang, der unterhalb eines Innenhochdruckumformdruckes abläuft, ausreichend Hohlprofilmaterial vor, um bei diesem Verfahrensschritt die Prozeßsicherheit zu geben.It is also conceivable before the dent 5 to follow an hydroforming process in that that the hollow profile 6 in the implementation 3 of the stamp 5th is expanded, whereby this is withdrawn further and serves as a counterhold for the resulting secondary form element. With the expansion, the ends can also be simultaneously through two of the hollow profile 6 axial plunger axially hollow profile material be pushed so that when widening no material failure in the form of bursting of the hollow profile 6 occurs. The secondary form element is then 5 pressed back into the initial shape of the hollow profile 6. This can be the case with internal high pressure, in which the material of the secondary form element is still flowable and no "frozen" Has stress states due to work hardening, or also to relieve the feed force to be applied for the stamp 5 at a pressure which is lower than the forming pressure, happen. Through the process step forming the secondary molding element is used for the subsequent mechanical denting Hollow profile material is available because of the manufacture of the secondary form element not just the hollow section wall piece that the Mouth opening of bushing 3 covers in the bushing 3 is pressed in, but also from the to the wall piece adjacent areas of the hollow profile 6 hollow profile material in the implementation 3 flows, which in addition from the replenishment process is forced. So the requirement is higher Forming degrees in the dent process, which is below an internal high pressure forming pressure expires, sufficient hollow profile material to ensure process reliability in this process step give.

    Des weiteren ist denkbar, nach dem Einbeulen während des Anlegens der Hohlprofilwandungen 13 an den Umfang und die Stirnseite 7 des Stempels 5 mittels zweier an beiden Enden des Hohlprofiles 6 angreifender am Umformwerkzeug 1 verschiebbar angeordneter Axialstempel axial Hohlprofilmaterial nachzuschieben, was die Prozeßsicherheit dieses Umformvorganges infolge des zusätzlichen Angebotes an umformbarem Hohlprofilmaterial weiter erhöht .It is also conceivable after denting during application the hollow profile walls 13 on the circumference and the end face 7 of the stamp 5 by means of two at both ends of the hollow profile 6 attacking on the forming tool 1 slidably arranged Axial ram axially to push hollow profile material what the process reliability of this forming process due to the additional Range of formable hollow profile material further increased ,

    Claims (9)

    1. A process for the manufacture of a mounting connection on a hollow section which is fashioned by means of the internal high-pressure forming of the hollow section for the fitting of a mounting component,
      characterised in that
      the hollow section (6) is indented at an internal pressure lower than a forming pressure at the point where the mounting connection (10) is to be produced by means of a die (5) forming a rough contour of the mounting connection (10), that while the die (5) remains in the indenting position a fluid internal high pressure is then generated in the hollow section (6) by means of which the walls (13) of the hollow sections surrounding the die (5) are pressed against the outer contour of the die (5) and that once the fluid high pressure has been reduced and the die (5) been removed the trough-shaped mounting connection (10) produced by the pressing is released.
    2. A process in accordance with claim 1,
      characterised in that
      an internal thread (19) is formed in the connection trough in the hollow section (6) by the co-operation of an internal high pressure and a corresponding negative-shaped contouring of a die (5).
    3. A process in accordance with claim 1,
      characterised in that
      the hollow section (6) is expanded into the passage (3) in the die (5) by means of internal high pressure prior to the indenting process and that thereafter the additional formed element produced thereby is reformed by being pressed back into the original shape - in terms of external contour - of the hollow section (6).
    4. A process in accordance with claim 3,
      characterised in that
      during the expansion of the hollow section (6) hollow section material is fed in axially by means of at least one axial die.
    5. A process in accordance with claim 1,
      characterised in that
      during the internal high-pressure forming process following indenting hollow section material is fed in axially by means of at least one axial die.
    6. A device for the manufacture of a mounting connection on a hollow section with an internal high-pressure forming tool into the engraving of which the hollow section can be introduced, the engraving having a recess, to carry out the process in accordance with claim 1,
      characterised in that
      the recess is designed in the form of a passage (3) into which a die (5) is introduced which is driven and controlled by means of a drive unit in such a manner that when the hollow section (6) has been introduced and the pressure conditions are below the forming pressure it is introduced into the engraving (4) indenting the hollow section (6) before the internal high-pressure forming process and then removed from the engraving (4) after the forming process, and which is supported at the rear in the indenting position against the forming pressure to keep it stationary during the forming of the hollow section (6).
    7. A device in accordance with claim 6,
      characterised in that
      the end (7) of the indenting die (5) facing the hollow section (6) has a die-stamped contour (8) which matches the contour of the mounting connection (10).
    8. A device in accordance with claim 6,
      characterised in that
      the die (5) has an external thread on the peripheral section which projects into the engraving (4).
    9. A device in accordance with claim 6,
      characterised in that
      the die (5) is designed without undercutting - when viewed from the hollow section (6) introduced into the forming tool (1).
    EP98113750A 1997-08-02 1998-07-23 Method and apparatus for forming a connecting portion on a hollow profile Expired - Lifetime EP0895819B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19733476A DE19733476C2 (en) 1997-08-02 1997-08-02 Process for the production of an appropriate mounting location on a hollow profile
    DE19733476 1997-08-02

    Publications (2)

    Publication Number Publication Date
    EP0895819A1 EP0895819A1 (en) 1999-02-10
    EP0895819B1 true EP0895819B1 (en) 2002-09-18

    Family

    ID=7837805

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98113750A Expired - Lifetime EP0895819B1 (en) 1997-08-02 1998-07-23 Method and apparatus for forming a connecting portion on a hollow profile

    Country Status (4)

    Country Link
    US (2) US6581263B1 (en)
    EP (1) EP0895819B1 (en)
    DE (2) DE19733476C2 (en)
    ES (1) ES2183263T3 (en)

    Families Citing this family (5)

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    DE10162393A1 (en) * 2001-12-19 2003-07-03 Bayerische Motoren Werke Ag manufacturing processes
    DE10162394A1 (en) * 2001-12-19 2003-07-03 Bayerische Motoren Werke Ag Manufacturing process and hydroforming tool to carry out the manufacturing process
    DE102008010830A1 (en) 2008-02-23 2009-08-27 Daimler Ag Metal sheet joint manufacturing method, involves forming collar by deformation at thin-walled material, where collar is formed for accommodating screw profile, and forming reinforcement profile surrounding collar at thin-walled material
    CN109482718B (en) * 2018-09-21 2021-01-26 北京长城华冠汽车科技股份有限公司 Hole opening method
    CN113523119A (en) * 2020-04-20 2021-10-22 深圳市大富科技股份有限公司 Method and structure for increasing screw hole depth on thin plate and wireless communication base station

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    Also Published As

    Publication number Publication date
    EP0895819A1 (en) 1999-02-10
    US6581263B1 (en) 2003-06-24
    DE19733476A1 (en) 1999-02-18
    DE19733476C2 (en) 1999-08-19
    DE59805587D1 (en) 2002-10-24
    ES2183263T3 (en) 2003-03-16
    US20030189272A1 (en) 2003-10-09
    US7024769B2 (en) 2006-04-11

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