EP0895819A1 - 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
EP0895819A1
EP0895819A1 EP98113750A EP98113750A EP0895819A1 EP 0895819 A1 EP0895819 A1 EP 0895819A1 EP 98113750 A EP98113750 A EP 98113750A EP 98113750 A EP98113750 A EP 98113750A EP 0895819 A1 EP0895819 A1 EP 0895819A1
Authority
EP
European Patent Office
Prior art keywords
hollow profile
stamp
pressure
forming
engraving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98113750A
Other languages
German (de)
French (fr)
Other versions
EP0895819B1 (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.)
Daimler AG
Original Assignee
DaimlerChrysler AG
Daimler Benz AG
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Publication date
Application filed by DaimlerChrysler AG, Daimler Benz AG filed Critical DaimlerChrysler AG
Publication of EP0895819A1 publication Critical patent/EP0895819A1/en
Application granted granted Critical
Publication of EP0895819B1 publication Critical patent/EP0895819B1/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 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.
  • a generic method or a generic device is known from DE 41 03 083 C1.
  • a metal pipe branch described by means of hydroforming will be produced.
  • 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.
  • the specially shaped forming tool very complex to manufacture and through its Form aur a very specific type of mounting surfaces fixed for all and therefore different for training assembly surfaces to be designed completely unsuitable.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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 owns.
  • 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.
  • 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 internal 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.
  • the in the hollow profile 6 introduced pressurized fluid at high pressure, while the stamp 5 remains in its dent position.
  • the stamp 5 is on the back of its drive supported against the internal high pressure.
  • 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.
  • 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.
  • 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.
  • 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.
  • the process step forming the secondary molding element provides hollow profile material for the subsequent mechanical denting, since for the production of the Secondary shaped element not only the hollow profile wall piece, which covers the opening of the feedthrough 3, is pressed into the feedthrough 3, but also flows from the areas of the hollow profile 6 adjacent to the wall piece, the hollow profile material flows into the feedthrough 3, which is additionally forced by the re-pushing process If high degrees of deformation are required in the denting process, which takes place below a hydroforming pressure, sufficient hollow profile material is provided in order to provide process reliability in this process step.

Abstract

The component is shaped by internal pressure to accommodate the mounting component. With the internal pressure in the profiled component less than that needed for shaping, the mounting position (10) is rough-shaped using a punch (5). The latter is then left inside the indented portion while high fluidic pressure is generated inside the profiled component (6), causing the walls (13) of the indented portion to press against the punch external surface. Internal pressure is then released and the punch is extracted, leaving a trough-shaped indentation free to form the mounting position.

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 Montageflachen 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 aur 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 Form aur a very specific type of mounting surfaces 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 dented 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 bulging 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 owns. 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 Innennochdruckbeaufschlagung 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 internal 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 present. 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

    Figure 00070001
    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 furthermore conceivable to have an internal high-pressure forming process followed by the punch 5 prior to the denting, in that the hollow profile 6 is expanded into the bushing 3 of the punch 5, the latter being withdrawn further and serving as a counter-holder for the secondary molding element that is created. With the widening, axial hollow profile material can also be pushed simultaneously through two axial punches acting on the ends of the hollow profile 6, so that no material failure in the form of bursting of the hollow profile 6 occurs during the expansion. The secondary form element is then pressed back into the initial shape of the hollow profile 6 by the punch 5. This can be the case with internal high pressure, in which the material of the secondary form element is still flowable and none
    Figure 00070001
    "Frozen" stress states due to work hardening, or also to relieve the feed force to be applied for the punch 5 at a pressure which is less than the forming pressure. The process step forming the secondary molding element provides hollow profile material for the subsequent mechanical denting, since for the production of the Secondary shaped element not only the hollow profile wall piece, which covers the opening of the feedthrough 3, is pressed into the feedthrough 3, but also flows from the areas of the hollow profile 6 adjacent to the wall piece, the hollow profile material flows into the feedthrough 3, which is additionally forced by the re-pushing process If high degrees of deformation are required in the denting process, which takes place below a hydroforming pressure, sufficient hollow profile material is provided in order to provide process reliability in this process step.

    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)

    Verfahren zur Herstellung einer Montageanbindung an einem Hohlprofil, welche mittels Innenhochdruckumformens des Hohlprofiles für die Anbringung eines Montageteils ausgebildet wird,
    dadurch gekennzeichnet,
    daß das Hohlprofil (6) bei einem Innendruck, der geringer ist als ein Umformdruck, mittels eines Stempels (5) an der Stelle der herzustellenden Montageanbindung (10) unter Bildung einer Grobkontur der Montageanbindung (10) eingebeult wird, daß danach bei Verbleib des Stempels (5) in Einbeullage ein fluidischer Innenhochdruck im Hohlprofil (6) erzeugt wird, mittels dessen die den Stempel (5) umgebenden Hohlprofilwandungen (13) an die Außenkontur des Stempels (5) angepreßt werden, und daß nach Entspannung des Fluidhochdruckes und anschließendem Entfernen des Stempels (5) die durch die Anpressung fertiggestellte muldenförmige Montageanbindung (10) freigegeben wird.    Method for producing an assembly connection on a hollow profile, which is formed by means of internal high pressure forming of the hollow profile for the attachment of an assembly part,
    characterized,
    that the hollow profile (6) is dented at an internal pressure which is less than a forming pressure, by means of a stamp (5) at the location of the mounting connection (10) to be produced, forming a rough contour of the mounting connection (10), that the stamp then remains (5) a fluidic internal high pressure is generated in the hollow profile (6) in the bent-in position, by means of which the hollow profile walls (13) surrounding the stamp (5) are pressed against the outer contour of the stamp (5), and that after relaxation of the high fluid pressure and subsequent removal of the Stamp (5) the trough-shaped mounting connection (10) completed by the pressing is released.         Verfahren nach Anspruch 1,
    dadurch gekennzeichnet,
    daß in der Anbindungsmulde am Hohlprofil (6) durch Zusammenwirken eines Innenhochdruckes mit einer entsprechend formnegativen Konturierung eines Stempels (5) ein Innengewinde (19) ausgeformt wird.    Method according to claim 1,
    characterized,
    that an internal thread (19) is formed in the connecting trough on the hollow profile (6) by the interaction of an internal high pressure with a corresponding shape-negative contouring of a stamp (5).         Verfahren nach Anspruch 1,
    dadurch gekennzeichnet,
    daß vor dem Einbeulvorgang das Hohlprofil (6) in die Durchführung (3) des Stempels (5) durch Innenhochdruck aufgeweitet wird und daß danach das dadurch gebildete Nebenformelement vom Stempel (5) durch Zurückdrücken in - bezüglich der Außenkontur - die Ausgangsform des Hohlprofiles (6) zurückgeformt wird.    Method according to claim 1,
    characterized,
    that before the denting process, the hollow profile (6) is expanded into the leadthrough (3) of the stamp (5) by internal high pressure and that the secondary form element thereby formed by the stamp (5) by pressing back into - with respect to the outer contour - the initial shape of the hollow profile (6 ) is reshaped.         Verfahren nach Anspruch 3,
    dadurch gekennzeichnet,
    daß beim Aufweiten des Hohlprofiles (6) mittels zumindest eines Axialstempels axial Hohlprofilmaterial nachgeschoben wird.    Method according to claim 3,
    characterized,
    that when the hollow profile (6) is expanded, the hollow profile material is pushed axially by means of at least one axial punch.         Verfahren nach Anspruch 1,
    dadurch gekennzeichnet,
    daß beim dem Einbeulen nachfolgenden Innenhochdruckumformvorgang Hohlprofilmaterial mittels zumindest eines Axialstempels axial nachgeschoben wird.    Method according to claim 1,
    characterized,
    that in the internal high pressure forming process following the denting process, hollow profile material is axially pushed in by means of at least one axial ram.         Vorrichtung zur Herstellung einer Montageanbindung an einem Hohlprofil, mit einem Innenhochdruck-Umformwerkzeug, in dessen Gravur das Hohlprofil einbringbar ist, wobei die Gravur eine Aussparung aufweist, zur Durchführung des Verfahrens nach Anspruch 1,
    dadurch gekennzeichnet,
    daß die Aussparung in Form einer Durchführung (3) ausgebildet ist, in der ein Stempel (5) geführt ist, der derart gesteuert antreibbar ist, daß er bei eingebrachtem Hohlprofil (6) und bei Druckverhältnissen unterhalb des Umformdruckes vor dem Innenhochdruck-Umformprozeß in die Gravur (4) das Hohlprofil (6) einbeulend einfahrbar und nach dem Umformprozeß aus der Gravur (4) herausfahrbar ist, und der während des Umformprozesses des Hohlprofiles (6) entgegen dem Umformdruck in Einbeullage verharrend rückseitig abgestützt ist.    Device for producing a mounting connection on a hollow profile, with an internal high-pressure forming tool, into the engraving of which the hollow profile can be introduced, the engraving having a recess, for carrying out the method according to claim 1,
    characterized,
    that the recess is in the form of a bushing (3) in which a stamp (5) is guided, which can be driven in a controlled manner such that it is inserted into the hollow profile (6) and under pressure conditions below the forming pressure before the hydroforming process Engraving (4) the hollow profile (6) can be retracted and retracted from the engraving (4) after the shaping process, and which is supported on the back during the shaping process of the hollow profile (6) against the shaping pressure in the dented position.         Vorrichtung nach Anspruch 6,
    dadurch gekennzeichnet,
    daß die dem Hohlprofil (6) zugewandte Stirnseite (7) des einbeulenden Stempels (5) eine Prägekontur (8) aufweist, die der Kontur der Montageanbindung (10) entspricht.     Apparatus according to claim 6,
    characterized,
    that the end face (7) of the bulging punch (5) facing the hollow profile (6) has an embossed contour (8) which corresponds to the contour of the mounting connection (10).         Vorrichtung nach Anspruch 6,
    dadurch gekennzeichnet,
    daß der Stempel (5) am in die Gravur (4) hereinragenden Umfangsabschnitt ein Außengewinde aufweist.    Apparatus according to claim 6,
    characterized,
    that the stamp (5) has an external thread on the circumferential section protruding into the engraving (4).         Vorrichtung nach Anspruch 6,
    dadurch gekennzeichnet,
    daß der Stempel (5) - aus der Sicht des in das Umformwerkzeug (1) eingebrachten Hohlprofiles (6) - hinterschnittfrei ausgebildet ist.    Apparatus according to claim 6,
    characterized,
    that the stamp (5) - from the point of view of the hollow profile (6) introduced into the forming tool (6) - is designed without undercuts.
    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

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

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    EP (1) EP0895819B1 (en)
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    ES (1) ES2183263T3 (en)

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    Also Published As

    Publication number Publication date
    DE19733476C2 (en) 1999-08-19
    EP0895819B1 (en) 2002-09-18
    US7024769B2 (en) 2006-04-11
    ES2183263T3 (en) 2003-03-16
    DE59805587D1 (en) 2002-10-24
    US20030189272A1 (en) 2003-10-09
    US6581263B1 (en) 2003-06-24
    DE19733476A1 (en) 1999-02-18

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