EP1138409B1 - Hydroforming die for the production of a hollow workpiece from two metal sheets - Google Patents

Hydroforming die for the production of a hollow workpiece from two metal sheets Download PDF

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Publication number
EP1138409B1
EP1138409B1 EP01107667A EP01107667A EP1138409B1 EP 1138409 B1 EP1138409 B1 EP 1138409B1 EP 01107667 A EP01107667 A EP 01107667A EP 01107667 A EP01107667 A EP 01107667A EP 1138409 B1 EP1138409 B1 EP 1138409B1
Authority
EP
European Patent Office
Prior art keywords
tool
feed means
mould
feed
section
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
EP01107667A
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German (de)
French (fr)
Other versions
EP1138409A1 (en
Inventor
Bernd Dr.-Ing. Engel
Matthias Dr.-Ing. Prier
Ralf Dipl.-Ing. Huber
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.)
Schuler Hydroforming GmbH and Co KG
Original Assignee
Schuler Hydroforming GmbH and Co KG
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Publication of EP1138409A1 publication Critical patent/EP1138409A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • 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
    • B21D26/021—Deforming sheet bodies
    • B21D26/031—Mould construction
    • 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
    • B21D26/053—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 characterised by the material of the blanks
    • B21D26/059—Layered blanks
    • 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 multi-part mold for hollow components to be produced after hydroforming from two sheet metal blanks, comprising an upper and a lower die, which have a mold cavity and between which the sheet metal blanks can be clamped at their edge regions, with a feed agent for the active medium in the mold cavity, which is arranged displaceably in the tool and can be taken along transversely in the direction of the clamping plane of the upper and lower tools with the material flowing during the deformation.
  • DE 198 16 566 A1 discloses a molding tool for components to be produced after hydroforming from two sheet metal plates welded at the edges, which simultaneously enables a tight docking and a reflow of the clamped edge areas of the double plate in the direction of the mold cavity.
  • a carrier for the docking plunger is slidably seated in the upper part of the tool and is held with an attachment in a guide which is firmly seated in the upper part in the manner of a sliding block guide.
  • the docking punch which has a conical mouthpiece and a sealing collar set back relative to the end face of the conical mouthpiece, can be pushed forward in the carrier in the direction of the clamping plane of the upper and lower tools.
  • the docking plunger Since the docking plunger is slidably mounted, the geometric conditions during the flow of the material remain unchanged when material flows in from the area where the docking plunger is docked, so that the sealing connection of the docking plunger is also retained. It proves disadvantageous here that the carrier or the transverse docking die is arranged displaceably in the tool itself, which makes a corresponding recess in the tool necessary. At the same time, the known design necessitates a flexible connecting piece between the pressure source and the docking stamp which is also moved.
  • the invention is therefore based on the object of creating a generic molding tool which, while overcoming the disadvantages of the prior art, ensures effective carrying of the feed means for the active medium.
  • the feeder section opening into the mold cavity penetrates at least two disks with an eccentric adjustment in order to be displaceable, and the eccentric adjustment is selected such that the feeder section covers a rectilinear displacement path due to opposite directions of rotation of the disks.
  • this creates a structurally simpler implementation of a moving feed means system.
  • the two disks with eccentric adjustment are an inner disk which can be rotated about their center and which is integrated eccentrically in an outer disk which can also be rotated about their center.
  • the feed means section which can be carried along with the flow movement of the board material, for introducing the active fluid penetrates the inner pane eccentrically, which in turn is received by the outer pane.
  • the feed means section opening into the mold cavity or into the feed channel it is possible for the feed means section opening into the mold cavity or into the feed channel to make a movement transversely in the direction of the clamping plane between the upper and lower tool by mutual rotary movement of the rotatable disks.
  • the diameter of the inner disk corresponds to the radius of the outer disk.
  • the molding tool is advantageously further developed in that, in addition to the first section opening into the mold cavity, the feed means comprise a second, fixed feed means section penetrating either the upper or the lower tool, which opens into a feed channel which extends parallel to the displacement path, around the first feed means section along the same To supply displacement path with active agents. In this way it is ensured that the entrained first feed means section is always supplied with active fluid by moving along the feed channel.
  • the proposed driving means are a far more integral part of the tool.
  • a receiving plate is provided on the tool side, from which the active fluid enters, which receives the two eccentric disks.
  • the feed means section opening into the mold cavity is designed as an axial channel or as a nozzle.
  • the inner disk has a conical mouthpiece with a recessed collar, the mouthpiece anchoring the axial channel with the inner disk and indirectly the outer disk in the board.
  • the molding tool has the advantage that both boards always come into contact with the tool, so that contact friction which arises as a result can be exploited.
  • the board provided with the opening is placed tightly on a correspondingly designed mouthpiece of the feed means section opening into the feed channel which will be formed later, and this feed means section is carried along with the flowing material in an eccentric adjustment by counter-rotating movement of the two disks, whereby it is always supplied with active fluid along the displacement path.
  • the insertion and docking phases coincide accordingly.
  • the tool for internal high pressure forming shown in detail in FIG. 1 is composed of an upper and lower tool 1, 2, which form a mold cavity between them.
  • Figure 5 which gives an overview of such a tool according to the prior art, the hydroforming is to be described.
  • it is composed of the insertion, the docking phase, the expansion phase and the calibration phase.
  • the two blanks 3, 4 to be formed After one of the two blanks 3, 4 to be formed has been provided with an opening, the two blanks 3, 4 are inserted into the tool and the two tool parts 1, 2 are moved together by guide and pressing devices, not shown here, so that the blanks run all around in one Edge area are pinched.
  • the docking then usually takes place with a docking stamp for introducing the active fluid, the docking stamp being connected to the opening of the one circuit board.
  • the active fluid enters through the docking plunger under high pressure and displaces the other board into a feed channel that widens in the edge area of the boards.
  • the blanks in the mold cavity expand, and material flows in from the clamped edge areas in the direction of the mold cavity.
  • the edge areas clamped more tightly, and the blanks - assuming the engraving of the tool - are expanded further to the finished contour.
  • FIG. 1 shows a molding tool further developed according to the invention at the beginning of the expansion phase with a moving feed system. It comprises an upper and a lower tool 1, 2, which hold two sheet metal plates 3, 4 between them. A receiving plate 5 is provided along the lower tool 2, against which the edge areas of the lower plate 4 come to rest or are clamped. This receives an outer circular disk 6, which is arranged rotating about its center. A circular inner disk 7 with a smaller diameter in relation to the outer disk 6 is arranged eccentrically to the outer disk 6. Transversely to the clamping plane of the blanks 3, 4, a nozzle or an axial channel 8 extends along the inner or outer disk 7, 6.
  • the inner disk 7 is provided with a conical mouthpiece 9 at the mouth area of the axial channel 8 and has accordingly Thickness of the circuit board in its initial shape has a collar 10 which is flush with the circuit board 4 at the top.
  • the axial channel 8 has an extension 11 with an enlarged diameter on the other side of the inner disk.
  • a feed or collection channel 12 is incorporated, which extends below the two disks parallel to the clamping plane of the two boards. Its expansion is limited by the maximum diameter of the outer disk 6.
  • This feed channel 12, advantageously in the form of a groove, is connected to the active fluid, i.e. through a pressure channel 13 which leads through the lower tool. with a hydraulic fluid, fed (indicated here with an arrow).
  • the boards 3, 4 are inserted into the tool, the board 4, which has been provided with a corresponding opening, being inserted in such a way that the mouthpiece 9 of the axial channel 8 already engages tightly in the opening.
  • the expansion phase initiated by introducing hydraulic fluid.
  • the second board 3 in the upper tool 1 diverts into the feed channel 14. Due to the increasing expansion of the blanks in the mold cavity, material flows in the direction of the mold cavity.
  • the axial channel 8, which is firmly anchored in the opening of the lower plate 4 is carried along by the flow movement and is moved in a straight line by the counter-rotating movement of the two disks. This movement and thus the local displacement of the entrainment means becomes clear in FIGS. 2 and 4, in which the directions of rotation of the two disks and the movement of the axial channel are represented by corresponding arrows.
  • FIG. 3 shows the position of the entrainment means (disks 6, 7) at the end of the expansion phase, the axial channel being approximately at the end of its displacement path.
  • the fulcrums of the two letters (outer pane 6, inner pane 7) are designated 15, 16 here.
  • the outer disk 6 always moves around its center 15 while taking the inner disk 7, which is also rotatable about its own center 16, with the axial channel as a whole moving in a straight line. The backward movement of the axial channel takes place after the component has been removed from the tool by returning the eccentric disk arrangement to its initial position.
  • the arrangement of the feed means for the active fluid or the entrainment means is not limited to the lower tool; they can of course also be arranged in the upper tool. All in all, in comparison to known moving systems for supplying the active fluid, a fault-free working solution integrated into the tool is created due to the design of the movement means as disks, which are offset eccentrically to one another, and the connection between the board is already created when the boards are inserted and feed means for the active fluid are achieved and thus can dispense with the docking phase by transverse docking of a docking plunger.

Abstract

The mould tool has a hollow space defined between cooperating upper and lower tool parts (1,2) between which 2 sheet metal plates (3,4) are clamped at their edges, with a high pressure forming medium supplied to the gap between the sheet metal plates via a pressure medium feed (8,12,13) provided in part by a pair of counter-rotating discs in each tool part, allowing a linear displacement of the pressure medium feed.

Description

Die Erfindung betrifft ein mehrteiliges Formwerkzeug für nach dem Innenhochdruck-Umformen herzustellende hohle Bauteile aus zwei Blechplatinen, umfassend ein Ober- und ein Unterwerkzeug, welche einen Formhohlraum aufweisen, und zwischen denen die Blechplatinen an ihren Randbereichen einspannbar sind, mit einem Zuführmittel für das Wirkmedium in den Formhohlraum, das im Werkzeug verschiebbar angeordnet ist und quer in Richtung der Einspannebene von Ober- und Unterwerkzeug mit dem bei der Verformung mitfließenden Material mitnehmbar ist.The invention relates to a multi-part mold for hollow components to be produced after hydroforming from two sheet metal blanks, comprising an upper and a lower die, which have a mold cavity and between which the sheet metal blanks can be clamped at their edge regions, with a feed agent for the active medium in the mold cavity, which is arranged displaceably in the tool and can be taken along transversely in the direction of the clamping plane of the upper and lower tools with the material flowing during the deformation.

Beim Innenhochdruckumformen von Platinen werden bekanntlich zwei Blechplatinen aufeinandergelegt, in ein mindestens zweigeteiltes Werkzeug eingelegt und beim Schließen des Werkzeugs durch die Schließkraft eingespannt. Durch Einleiten eines Wirkfluids in den Trennspalt der beiden Platinen weiten sich diese in die Gravur des Umformwerkzeuges auf. Dabei ergibt sich bei bekannten Andocksystemen mit feststehendem Andockkolben mit Führungskanal für das Wirkmedium der Nachteil, daß durch das plastische Fließen der einen Platine beim Umformvorgang die festangeordnete Durchleitöffnung, die in der anderen Platine eingebracht ist, bzw. der Mündungsbereich des Führungskanals weitgehend abgedichtet wird und sich das Wirkmedium gegen diesen Widerstand zwischen den Platinen einen Weg suchen muß bzw. im Extremfall gestoppt wird.As is known, in the case of internal high-pressure forming of blanks, two sheet metal blanks are placed one on top of the other, placed in a tool that is divided into at least two parts, and clamped by the closing force when the tool is closed. By introducing an active fluid into the separation gap of the two blanks, they expand into the engraving of the forming tool. In known docking systems with a fixed docking piston with guide channel for the active medium, there is the disadvantage that the fixed flow-through opening, which is introduced in the other board, or the mouth region of the guide channel is largely sealed by the plastic flow of the one board during the forming process is and the active medium must find a way against this resistance between the boards or is stopped in extreme cases.

Aus der DE 198 16 566 A1 ist ein Formwerkzeug für nach dem Innenhochdruck-Umformen herzustellende Bauteile aus zwei an den Rändern verschweißten Blechplatinen bekannt, welches gleichzeitig ein dichtes Andocken und ein Nachfließen der eingespannten Randbereiche der Doppelplatine in Richtung Formhohlraum ermöglicht. Hierzu sitzt im Oberteil des Werkzeugs verschieblich ein Träger für den Andockstempel, der mit einem Ansatz in einer fest im Oberteil sitzenden Führung nach Art einer Kulissenführung gehalten ist. Der Andockstempel, der ein konisches Mundstück und einen gegenüber der Stirnseite des konischen Mundstücks zurückversetzten Dichtungskragen aufweist, ist in dem Träger quer in Richtung der Einspannebene von Ober- und Unterwerkzeug vorschiebbar. Da der Andockstempel verschiebbar gelagert ist, bleiben beim Nachfließen von Material auch aus dem Bereich des Rands, wo der Andockstempel angedockt ist, die geometrischen Verhältnisse beim Nachfließen des Materials unverändert, so daß auch der dichtende Anschluß des Andockstempels erhalten bleibt. Hierbei erweist es sich als nachteilig, daß der Träger bzw. der Querandockstempel im Werkzeug selbst verschiebbar angeordnet ist, was eine entsprechende Aussparung im Werkzeug erforderlich macht. Gleichzeitig macht die bekannte Ausführung ein flexibles Verbindungsstück zwischen Druckquelle und mitbewegtem Andockstempel notwendig.DE 198 16 566 A1 discloses a molding tool for components to be produced after hydroforming from two sheet metal plates welded at the edges, which simultaneously enables a tight docking and a reflow of the clamped edge areas of the double plate in the direction of the mold cavity. For this purpose, a carrier for the docking plunger is slidably seated in the upper part of the tool and is held with an attachment in a guide which is firmly seated in the upper part in the manner of a sliding block guide. The docking punch, which has a conical mouthpiece and a sealing collar set back relative to the end face of the conical mouthpiece, can be pushed forward in the carrier in the direction of the clamping plane of the upper and lower tools. Since the docking plunger is slidably mounted, the geometric conditions during the flow of the material remain unchanged when material flows in from the area where the docking plunger is docked, so that the sealing connection of the docking plunger is also retained. It proves disadvantageous here that the carrier or the transverse docking die is arranged displaceably in the tool itself, which makes a corresponding recess in the tool necessary. At the same time, the known design necessitates a flexible connecting piece between the pressure source and the docking stamp which is also moved.

Der Erfindung liegt daher die Aufgabe zugrunde, ein gattungsgemäßes Formwerkzeug zu schaffen, das bei Überwindung der Nachteile aus dem Stand der Technik eine wirkungsvolle Mitführung der Zuführmittel für das Wirkmedium gewährleistet.The invention is therefore based on the object of creating a generic molding tool which, while overcoming the disadvantages of the prior art, ensures effective carrying of the feed means for the active medium.

Diese Aufgabe wird mittels eines Formwerkzeugs mit den Merkmalen des Anspruchs 1 gelöst. Bevorzugte Ausgestaltungen sind in den Unteransprüchen offenbart.This object is achieved by means of a molding tool with the features of claim 1. Preferred configurations are disclosed in the subclaims.

Hierzu wird vorgeschlagen, daß der in den Formhohlraum mündende Zuführmittelabschnitt zwecks seiner Verschiebbarkeit mindestens zwei Scheiben mit einer Exzenterverstellung durchdringt und die Exzenterverstellung derart gewählt ist, daß durch gegenläufige Drehrichtungen der Scheiben der Zuführmittelabschnitt einen geradlinigen Verschiebeweg zurücklegt. Damit wird gegenüber der Lösung, wie sie in der DE 198 16 566 A1 beschrieben ist, eine konstruktiv einfachere Realisierung eines mitlaufenden Zuführmittelsystems geschaffen.For this purpose, it is proposed that the feeder section opening into the mold cavity penetrates at least two disks with an eccentric adjustment in order to be displaceable, and the eccentric adjustment is selected such that the feeder section covers a rectilinear displacement path due to opposite directions of rotation of the disks. Compared to the solution as described in DE 198 16 566 A1, this creates a structurally simpler implementation of a moving feed means system.

Nach einer besonders bevorzugten Ausführungsform handelt es sich bei den beiden Scheiben mit Exzenterverstellung um eine um ihren Mittelpunkt rotierbare Innenscheibe, die in eine ebenfalls um ihren Mittelpunkt rotierbare Außenscheibe exzentrisch integriert ist. Der mit der Fließbewegung des Platinenmaterials mitführbare Zuführmittelabschnitt zum Einbringen des Wirkfluids durchdringt die Innenscheibe exzentrisch, die wiederum von der Außenscheibe aufgenommen wird. Wenn bei dem Umformvorgang das Platinenmaterial anfängt zu fließen, ist es dem in den Formhohlraum bzw. in den Zuführkanal mündenden Zuführmittelabschnitt möglich, durch gegenseitige Drehbewegung der rotierbaren Scheiben eine Bewegung quer in Richtung der Einspannebene zwischen Ober- und Unterwerkzeug mitzumachen. Bei einer bevorzugten Ausbildung entspricht der Durchmesser der Innenscheibe dem Radius der Außenscheibe.According to a particularly preferred embodiment, the two disks with eccentric adjustment are an inner disk which can be rotated about their center and which is integrated eccentrically in an outer disk which can also be rotated about their center. The feed means section, which can be carried along with the flow movement of the board material, for introducing the active fluid penetrates the inner pane eccentrically, which in turn is received by the outer pane. When the blank material begins to flow during the forming process, it is possible for the feed means section opening into the mold cavity or into the feed channel to make a movement transversely in the direction of the clamping plane between the upper and lower tool by mutual rotary movement of the rotatable disks. In a preferred embodiment, the diameter of the inner disk corresponds to the radius of the outer disk.

Das Formwerkzeug wird vorteilhaft weitergebildet, indem die Zuführmittel neben dem in den Formhohlraum mündenden ersten Abschnitt einen zweiten, entweder das Ober- oder das Unterwerkzeug durchdringenden, festen Zuführmittelabschnitt umfassen, der in einen sich parallel zum Verschiebeweg erstreckenden Speisekanal einmündet, um den ersten Zuführmittelabschnitt entlang seines Verschiebeweges mit Wirkmittel zu versorgen. Auf diese Weise ist gewährleistet, daß der mitgenommene erste Zuführmittelabschnitt durch Verfahren entlang des Speisekanals stets mit Wirkfluid versorgt wird.The molding tool is advantageously further developed in that, in addition to the first section opening into the mold cavity, the feed means comprise a second, fixed feed means section penetrating either the upper or the lower tool, which opens into a feed channel which extends parallel to the displacement path, around the first feed means section along the same To supply displacement path with active agents. In this way it is ensured that the entrained first feed means section is always supplied with active fluid by moving along the feed channel.

Im Gegensatz zu dem bekannten Träger-Prinzip nach Art einer Kulissenführung sind die vorgeschlagenen Mitnahmemittel ein weit mehr in das Werkzeug integrierter Bestandteil. Hierzu ist eine Aufnahmeplatte auf der Werkzeugseite vorgesehen, von der das Wirkfluid eintritt, die die beiden Exzenterscheiben aufnimmt. Der in den Formhohlraum mündende Zuführmittelabschnitt ist als axialer Kanal bzw. als Düse ausgebildet. Zur Gewährleistung eines dichten Verbundes zwischen der Öffnung in der Platine und dem axialen Kanal weist die Innenscheibe ein konisches Mündungsstück mit einem zurückversetzten Kragen auf, wobei das Mündungsstück den axialen Kanal mit Innenscheibe sowie mittelbar die Außenscheibe in der Platine verankert. Zudem weist das Formwerkzeug den Vorteil auf, daß beide Platinen stets mit dem Werkzeug in Berührung kommen, wodurch sich eine dadurch entstehende Kontaktreibung ausnutzen läßt.In contrast to the known carrier principle in the manner of a link guide, the proposed driving means are a far more integral part of the tool. For this purpose, a receiving plate is provided on the tool side, from which the active fluid enters, which receives the two eccentric disks. The feed means section opening into the mold cavity is designed as an axial channel or as a nozzle. To ensure a tight connection between the opening in the board and the axial channel, the inner disk has a conical mouthpiece with a recessed collar, the mouthpiece anchoring the axial channel with the inner disk and indirectly the outer disk in the board. In addition, the molding tool has the advantage that both boards always come into contact with the tool, so that contact friction which arises as a result can be exploited.

Beim Einlegen der Platinen in das Werkzeug wird die mit der Öffnung versehene Platine dicht auf einem entsprechend ausgebildeten Mündungsstück des in den sich später ausbildenden Zuführkanal mündenden Zuführmittelabschnitts plaziert und dieser Zuführmittelabschnitt durch gegenläufige Drehbewegung der beiden Scheiben in einer Exzenterverstellung zusammen mit dem fließenden Materialmitgeführt, wobei er entlang des Verschiebeweges stets mit Wirkfluid versorgt wird. Einlege- und Andockphase fallen demgemäß zusammen.When the boards are inserted into the tool, the board provided with the opening is placed tightly on a correspondingly designed mouthpiece of the feed means section opening into the feed channel which will be formed later, and this feed means section is carried along with the flowing material in an eccentric adjustment by counter-rotating movement of the two disks, whereby it is always supplied with active fluid along the displacement path. The insertion and docking phases coincide accordingly.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus den Ansprüchen und der nachfolgenden Beschreibung. Hierbei zeigen jeweils schematisch:

Figur 1
einen Ausschnitt eines Querschnitts eines Werkzeugs nach einer erfindungsgemäßen Ausführungsform mit in das Werkzeug eingelegten und eingespannten Blechplatinen kurz nach Beginn der Aufweitphase;
Figur 2
die Stellung der Mitnahmemittel des Werkzeugs in der Phase nach Figur 1;
Figur 3
den Ausschnitt eines Werkzeugs nach Figur 1 am Ende der Aufweitphase;
Figur 4
die Stellung der Mitnahmemittel des Werkzeugs in der Phase nach Figur 3;
Figur 5
ein Werkzeug im Querschnitt mit eingespannten Platinen mit einem feststehenden Andocksystem nach dem Stand der Technik.
Further details and advantages of the invention emerge from the claims and the following description. Each shows schematically:
Figure 1
a section of a cross section of a tool according to an embodiment of the invention with sheet metal plates inserted and clamped into the tool shortly after the start of the expansion phase;
Figure 2
the position of the driving means of the tool in the phase according to FIG. 1;
Figure 3
the section of a tool according to Figure 1 at the end of the expansion phase;
Figure 4
the position of the driving means of the tool in the phase according to FIG. 3;
Figure 5
a tool in cross section with clamped boards with a fixed docking system according to the prior art.

Das in Figur 1 ausschnittsweise dargestellte Werkzeug zum Innenhochdruck-Umformen setzt sich aus einem Ober- und Unterwerkzeug 1, 2 zusammen, die zwischen sich einen Formhohlraum ausbilden. Mit Hilfe von Figur 5, die einen Gesamtüberblick auf ein solches Werkzeug nach dem Stand der Technik gibt, soll das Innenhochdruckumformen beschrieben werden. Bekanntermaßen setzt es sich aus der Einlege-, der Andockphase, der Aufweitphase sowie der Kalibrierphase zusammen. Nachdem eine der beiden umzuformenden Platinen 3, 4 mit einer Öffnung versehen wurde, werden die beiden Platinen 3, 4 in das Werkzeug eingelegt und die beiden Werkzeugteile 1, 2 durch hier nicht dargestellte Führungs- und Preßvorrichtungen zusammengefahren, so daß die Platinen umlaufend in einem Randbereich eingeklemmt werden. Üblicherweise erfolgt dann das Andocken mit einem Andockstempel zum Einbringen des Wirkfluids, wobei der Andockstempel an die Öffnung der einen Platine angeschlossen wird. Das Wirkfluid tritt durch den Andockstempel unter Hochdruck ein und verdrängt die andere Platine in einen sich im Randbereich der Platinen aufweitenden Zuführkanal. Während dieser Aufweitphase weiten sich die Platinen im Formhohlraum auf, und es fließt Material aus den eingeklemmten Randbereichen in Richtung des Formhohlraums nach. Bei der sich anschließenden Kalibrierphase werden die Randbereiche fester eingeklemmt, und die Platinen werden - die Gravur des Werkzeugs annehmend - bis zur Fertigkontur weiter aufgeweitet.The tool for internal high pressure forming shown in detail in FIG. 1 is composed of an upper and lower tool 1, 2, which form a mold cavity between them. With the help of Figure 5, which gives an overview of such a tool according to the prior art, the hydroforming is to be described. As is known, it is composed of the insertion, the docking phase, the expansion phase and the calibration phase. After one of the two blanks 3, 4 to be formed has been provided with an opening, the two blanks 3, 4 are inserted into the tool and the two tool parts 1, 2 are moved together by guide and pressing devices, not shown here, so that the blanks run all around in one Edge area are pinched. The docking then usually takes place with a docking stamp for introducing the active fluid, the docking stamp being connected to the opening of the one circuit board. The active fluid enters through the docking plunger under high pressure and displaces the other board into a feed channel that widens in the edge area of the boards. During this expansion phase, the blanks in the mold cavity expand, and material flows in from the clamped edge areas in the direction of the mold cavity. In the subsequent calibration phase, the edge areas clamped more tightly, and the blanks - assuming the engraving of the tool - are expanded further to the finished contour.

Die Figur 1 stellt ein erfindungsgemäß weiterentwickeltes Formwerkzeug am Beginn der Aufweitphase mit einem mitlaufenden Zuführmittelsystem dar. Es umfaßt ein Ober- und ein Unterwerkzeug 1, 2, welche zwischen sich zwei Blechplatinen 3, 4 aufnehmen. Entlang des Unterwerkzeugs 2, an dem die Randbereiche der unteren Platine 4 zur Anlage kommen bzw. eingeklemmt werden, ist eine Aufnahmeplatte 5 vorgesehen. Diese nimmt eine äußere kreisförmige Scheibe 6, die um ihren Mittelpunkt rotierend angeordnet ist, auf. Exzentrisch zur Außenscheibe 6 ist eine kreisförmige Innenscheibe 7 mit im Verhältnis zur Außenscheibe 6 kleineren Durchmesser angeordnet. Quer zur Einspannebene der Platinen 3, 4 erstreckt sich eine Düse bzw. ein axialer Kanal 8 entlang der Innen- bzw. der Außenscheibe 7, 6. Die Innenscheibe 7 ist mit einem konischen Mundstück 9 am Mündungsbereich des axialen Kanals 8 versehen und weist entsprechend der Dicke der Platine in deren Ausgangsform einen Kragen 10 auf, der oben bündig mit der Platine 4 abschließt. Der axiale Kanal 8 weist auf der anderen Seite der Innenscheibe ein Ansatzstück 11 mit vergrößertem Durchmesser auf. In das Unterwerkzeug 2 des Werkzeugs ist ein Speise- bzw. Sammelkanal 12 eingearbeitet, der sich unterhalb der beiden Scheiben parallel zur Einspannebene der beiden Platinen erstreckt. Seine Ausdehnung ist durch den maximalen Durchmesser der Außenscheibe 6 begrenzt. Dieser Speisekanal 12, vorteilhaft als Nut ausgebildet, wird über einen Druckkanal 13, welcher durch das Unterwerkzeug führt, mit dem Wirkfluid, d.h. mit einer Druckflüssigkeit, gespeist (hier mit einem Pfeil angedeutet).FIG. 1 shows a molding tool further developed according to the invention at the beginning of the expansion phase with a moving feed system. It comprises an upper and a lower tool 1, 2, which hold two sheet metal plates 3, 4 between them. A receiving plate 5 is provided along the lower tool 2, against which the edge areas of the lower plate 4 come to rest or are clamped. This receives an outer circular disk 6, which is arranged rotating about its center. A circular inner disk 7 with a smaller diameter in relation to the outer disk 6 is arranged eccentrically to the outer disk 6. Transversely to the clamping plane of the blanks 3, 4, a nozzle or an axial channel 8 extends along the inner or outer disk 7, 6. The inner disk 7 is provided with a conical mouthpiece 9 at the mouth area of the axial channel 8 and has accordingly Thickness of the circuit board in its initial shape has a collar 10 which is flush with the circuit board 4 at the top. The axial channel 8 has an extension 11 with an enlarged diameter on the other side of the inner disk. In the lower tool 2 of the tool, a feed or collection channel 12 is incorporated, which extends below the two disks parallel to the clamping plane of the two boards. Its expansion is limited by the maximum diameter of the outer disk 6. This feed channel 12, advantageously in the form of a groove, is connected to the active fluid, i.e. through a pressure channel 13 which leads through the lower tool. with a hydraulic fluid, fed (indicated here with an arrow).

Zur Durchführung des Verfahrens werden die Platinen 3, 4 in das Werkzeug eingelegt, wobei die Platine 4, die mit einer entsprechenden Öffnung versehen wurde, so eingelegt wird, daß das Mündungsstück 9 des axialen Kanals 8 bereits dicht in die Öffnung eingreift. Nach dieser Einlegephase, die bereits die Andockphase nach dem bekannten herkömmlichen Verfahren einschließt, wird die Aufweitphase durch Einleiten von Druckflüssigkeit eingeleitet. Hierbei weicht die zweite Platine 3 im oberen Werkzeug 1 in den Zuführkanal 14 aus. Aufgrund der zunehmenden Aufweitung der Platinen im Formhohlkörper fließt Material in Richtung Formhohlraum nach. Der axiale Kanal 8, der in der Öffnung der unteren Platine 4 fest verankert ist, wird durch die Fließbewegung mitgenommen und auf einem geradlinigen Weg durch die gegenläufige Drehbewegung der beiden Scheiben bewegt. Diese Bewegung und damit örtliche Verlagerung der Mitnahmemittel wird deutlich in den Figuren 2 und 4, in denen die Drehrichtungen der beiden Scheiben und die Bewegung des axialen Kanals durch entsprechende Pfeile dargestellt sind.To carry out the method, the boards 3, 4 are inserted into the tool, the board 4, which has been provided with a corresponding opening, being inserted in such a way that the mouthpiece 9 of the axial channel 8 already engages tightly in the opening. After this insertion phase, which already includes the docking phase according to the known conventional method, the expansion phase initiated by introducing hydraulic fluid. Here, the second board 3 in the upper tool 1 diverts into the feed channel 14. Due to the increasing expansion of the blanks in the mold cavity, material flows in the direction of the mold cavity. The axial channel 8, which is firmly anchored in the opening of the lower plate 4, is carried along by the flow movement and is moved in a straight line by the counter-rotating movement of the two disks. This movement and thus the local displacement of the entrainment means becomes clear in FIGS. 2 and 4, in which the directions of rotation of the two disks and the movement of the axial channel are represented by corresponding arrows.

Durch den entlang der gesamten Mitnahmestrecke verlaufenden Sammelkanal 12 wird der axiale Kanal 8 stets mit Druckflüssigkeit versorgt. Figur 3 zeigt die Stellung der Mitnahmemittel (Scheiben 6, 7) am Ende der Aufweitphase, wobei sich der axiale Kanal in etwa am Ende seines Verschiebeweges befindet. Die Drehpunkte der beiden Schreiben (Außenscheibe 6, Innenscheibe 7) sind hier mit 15, 16 bezeichnet. Bei der gezeigten Ausführungsform bewegt sich die äußere Scheibe 6 stets um ihren Mittelpunkt 15, während sie die ebenfalls um ihren eigenen Mittelpunkt 16 rotierbare innere Scheibe 7 mitnimmt, wobei der axiale Kanal insgesamt eine geradlinige Bewegung zurücklegt. Die Rückwärtsbewegung des axialen Kanals erfolgt nach Entnahme des Bauteils aus dem Werkzeug durch Zurückstellen der Exzenterscheibenanordnung in ihre Ausgangslage.The axial channel 8 is always supplied with hydraulic fluid through the collecting channel 12 running along the entire driving distance. FIG. 3 shows the position of the entrainment means (disks 6, 7) at the end of the expansion phase, the axial channel being approximately at the end of its displacement path. The fulcrums of the two letters (outer pane 6, inner pane 7) are designated 15, 16 here. In the embodiment shown, the outer disk 6 always moves around its center 15 while taking the inner disk 7, which is also rotatable about its own center 16, with the axial channel as a whole moving in a straight line. The backward movement of the axial channel takes place after the component has been removed from the tool by returning the eccentric disk arrangement to its initial position.

Es ist selbstverständlich, daß die Anordnung der Zuführmittel für das Wirkfluid bzw. die Mitnahmemittel nicht auf das Unterwerkzeug beschränkt sind; sie können selbstverständlich auch im Oberwerkzeug angeordnet sein. Insgesamt wird im Vergleich zu bekannten mitlaufenden Systemen zur Zuführung des Wirkfluids aufgrund der Ausbildung der Bewegungsmittel als Scheiben, die zueinander exzentrisch versetzt sind, eine störungsfrei arbeitende, in das Werkzeug integrierte Lösung geschaffen, die bereits mit Einlegen der Platinen den Verbund zwischen Platine und Zuführmitteln für das Wirkfluid erreicht und somit auf die Andockphase durch Querandocken eines Andockstempels verzichten kann.It goes without saying that the arrangement of the feed means for the active fluid or the entrainment means is not limited to the lower tool; they can of course also be arranged in the upper tool. All in all, in comparison to known moving systems for supplying the active fluid, a fault-free working solution integrated into the tool is created due to the design of the movement means as disks, which are offset eccentrically to one another, and the connection between the board is already created when the boards are inserted and feed means for the active fluid are achieved and thus can dispense with the docking phase by transverse docking of a docking plunger.

Claims (6)

  1. Mould tool for hollow components to be produced from two sheet metal plates (3, 4) according to the internal high-pressure forming process, comprising an upper and a lower tool (1, 2), which have a mould cavity and between which the sheet metal plates can be clamped at the edge regions thereof, with a feed means (8, 12, 13) for the working medium into the mould cavity, wherein the feed means is arranged in the tool to be displaceable and can be entrained transversely in the direction of the plane of clamping of the upper and lower tool, by interlocking with an opening formed in one of the two plates, by the material flowing along with the deforming, characterised in that at least two discs (6, 7) with an eccentric adjustment are arranged in the upper or lower tool (1, 2), the feed means section (8) opening into the mould cavity penetrates the discs .and the eccentric adjustment is selected in such a manner that through rotational directions of the discs in opposite sense the feed means section covers a rectilinear displacement path.
  2. Mould tool according to claim 1, characterised in that the feed means section (8) penetrates an inner disc (7) rotatable about the centre point thereof and this is eccentrically integrated in an outer disc (6) similarly rotatable about the centre point thereof.
  3. Mould tool according to claim 2, characterised in that the diameter of the inner disc (7) approximately corresponds with the radius of the outer disc (6).
  4. Mould tool according to one of claims 1 to 3, characterised in that the feed means comprises, apart from the first section (8) opening into the mould cavity, a second non-displaceable feed means section (13), which penetrates either the upper tool or the lower tool and which opens into a feed channel (12) extending parallel to the displacement path in order to supply the first feed means section (8) along its displacement path with working medium.
  5. Mould tool according to one of claims 1 to 4, characterised in that the inner disc (7) has a conical mouthpiece (9) with a set-back collar (10) which engages in fitting manner in the provided opening in the plate (4), which faces the feed means (8, 12, 13), for the purpose of creating a tight interlock.
  6. Mould tool according to one of claims 1 to 5, characterised by a receiving plate (5) between the lower or the upper tool and the lower or the upper plate, a channel (13) as second feed means section, which is formed in the lower or upper tool and opens into the feed channel (12), and a nozzle (8) as first feed means section, which can be entrained along the feed channel, together with the plate (4) flowing during the deforming, by the rotation in opposite sense of the inner and outer discs (7, 6), which are received by the receiving plate (5).
EP01107667A 2000-03-31 2001-03-28 Hydroforming die for the production of a hollow workpiece from two metal sheets Expired - Lifetime EP1138409B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10016206 2000-03-31
DE10016206A DE10016206C1 (en) 2000-03-31 2000-03-31 Forming tool for hollow components to be produced after hydroforming from two sheet metal blanks

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EP1138409A1 EP1138409A1 (en) 2001-10-04
EP1138409B1 true EP1138409B1 (en) 2003-09-10

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EP01107667A Expired - Lifetime EP1138409B1 (en) 2000-03-31 2001-03-28 Hydroforming die for the production of a hollow workpiece from two metal sheets

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US (1) US6341515B2 (en)
EP (1) EP1138409B1 (en)
JP (1) JP2001300645A (en)
KR (1) KR20010095020A (en)
AT (1) ATE249295T1 (en)
DE (2) DE10016206C1 (en)
ES (1) ES2207576T3 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10016025B4 (en) * 2000-03-31 2005-06-16 Hde Solutions Gmbh Process for producing hollow bodies
US6694790B2 (en) * 2002-04-17 2004-02-24 General Motors Corporation Mid plate process and equipment for the superplastic forming of parts from plural sheets
DE102005047852B4 (en) * 2005-10-05 2007-07-26 Thyssenkrupp Drauz Nothelfer Gmbh Tool and method for the production of cavities having sheet metal parts
WO2012079156A1 (en) 2010-12-17 2012-06-21 Magna International Inc. Apparatus and method for forming shaped articles from plural sheet metal blanks
CN110935780B (en) * 2019-12-16 2021-08-20 长沙而道新能源科技有限公司 Internal high-pressure forming hydraulic machine

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Publication number Priority date Publication date Assignee Title
US4331284A (en) * 1980-03-14 1982-05-25 Rockwell International Corporation Method of making diffusion bonded and superplastically formed structures
JPS5966941A (en) * 1982-10-07 1984-04-16 Mitsubishi Heavy Ind Ltd Manufacture of mold
US5692406A (en) * 1996-09-27 1997-12-02 Mcdonnell Douglas Corporation Gas inlet for a superplastic forming die and method of use
US5737954A (en) * 1996-11-15 1998-04-14 Mcdonnell Douglas Corporation Superplastic forming with direct electrical heating
DE19816566C2 (en) * 1998-04-15 2000-03-23 Thyssenkrupp Stahl Ag Tool and method for producing a hollow body by hydroforming

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ATE249295T1 (en) 2003-09-15
DE50100586D1 (en) 2003-10-16
JP2001300645A (en) 2001-10-30
EP1138409A1 (en) 2001-10-04
US6341515B2 (en) 2002-01-29
US20020000112A1 (en) 2002-01-03
KR20010095020A (en) 2001-11-03
DE10016206C1 (en) 2001-10-04
ES2207576T3 (en) 2004-06-01

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