EP0858848B1 - Forming apparatus - Google Patents

Forming apparatus Download PDF

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Publication number
EP0858848B1
EP0858848B1 EP98102248A EP98102248A EP0858848B1 EP 0858848 B1 EP0858848 B1 EP 0858848B1 EP 98102248 A EP98102248 A EP 98102248A EP 98102248 A EP98102248 A EP 98102248A EP 0858848 B1 EP0858848 B1 EP 0858848B1
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EP
European Patent Office
Prior art keywords
pressure
counter
forming apparatus
internal high
tool
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
EP98102248A
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German (de)
French (fr)
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EP0858848A1 (en
Inventor
Peter Dr. Bieling
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.)
Anton Bauer Werkzeug- und Maschinenbau & Co KG GmbH
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Anton Bauer Werkzeug- und Maschinenbau & Co KG GmbH
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Publication date
Priority to DE19705244A priority Critical patent/DE19705244A1/en
Application filed by Anton Bauer Werkzeug- und Maschinenbau & Co KG GmbH filed Critical Anton Bauer Werkzeug- und Maschinenbau & Co KG GmbH
Priority to EP98102248A priority patent/EP0858848B1/en
Priority to DE29823606U priority patent/DE29823606U1/en
Publication of EP0858848A1 publication Critical patent/EP0858848A1/en
Priority to US09/154,725 priority patent/US6041633A/en
Application granted granted Critical
Publication of EP0858848B1 publication Critical patent/EP0858848B1/en
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    • 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
    • B21D26/025—Means for controlling the clamping or opening of the moulds
    • 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
    • B21D26/039—Means for controlling the clamping or opening of the moulds

Definitions

  • the invention relates to a hydroforming device with a multi-part Mold and one of the parts of the mold against the deformation holding clamping device.
  • DE-A-4 432 692 describes a generic high pressure forming device described a pot-like clamping device. A forming tool is put through the pot and a placed on it, braced against the pot and the forming tool Lid held together. A lifting cylinder is available for lifting and lowering the lid Available.
  • the shaping device according to the invention which achieves this object is characterized in that that the clamping device and / or the mold at least one, deformations of the mold cavity at least partially compensating during forming Counter-tensioning device.
  • a certain deformation of the tensioning device is taken or / and tool in purchase, but generated by applying clamping force one or more provided in the clamping device and / or the tool Counter clamping devices for compensating deformations, so that the mold cavity largely maintains its shape.
  • clamping and tool parts are less stable with less effort Material are made. This advantageously also reduces the mass and weight of the Total forming device.
  • counter-tensioning devices can be used are, in a preferred embodiment of the invention, the counter-tensioning device a back pressure chamber.
  • the back pressure chamber can be subjected to the working pressure, which is advantageous a device used for pressurizing the workpiece also for the Back pressure chamber can be used.
  • the back pressure chamber is in one against the Forming tool adjacent clamping jaws provided, e.g. between the back pressure chamber and the tool provided a relatively thin clamping jaw wall can be, which is under the influence of the back pressure against the tool bulges and thus counteracts yielding of the clamping jaw or / and tool.
  • a short-stroke cylinder in which the back pressure chamber is formed, engage the jaws.
  • the clamping jaw lies against the mold with one by pressurizing the back pressure chamber against the rest of the jaws movable part of the jaw, this movable part in particular in the manner of a guided in the jaw Pressure piston is formed.
  • the clamping piston moves Maintaining a suitable pressure in the back pressure chamber accordingly, so that the tool part against it remains in place.
  • This embodiment with a movable jaw part is particularly advantageous in an internal high-pressure forming device, in which the clamping jaws via a bayonet ring can be brought into the clamping system against the tool, one being a Tool holder for the bayonet ring and a counter bearing forms. Due to the possibility of compensation via the jaws with the back pressure chamber Above all, defuse the strength requirements for the locking parts the bayonet lock, which therefore need to be less solid.
  • the back pressure chamber is including a pressure connection channel, provided with a sealing lining, which, in particular, through a plastic membrane that fills the counter-pressure chamber like a balloon can be formed.
  • a sealing liner is mainly used for the embodiment mentioned with a pressure piston-like jaw part is advantageous, because then the pressure piston is not particularly sealed in its guidance needs.
  • the drawing shows a hydroforming device in a sectional view.
  • a pot-shaped tool holder 1 with a bottom wall 2 and a vertical cylinder wall 3 drawn.
  • the bottom wall 2 is one over one Large part of the wall surface extending opening 4 is provided.
  • the cylinder wall 3 opposite openings 5 and 6 are formed.
  • a clamping jaw 7 is on the other hand rotatable via a hydraulic cylinder 8 Bayonet ring 9 in engagement.
  • a clamping jaw counter plate 10 is arranged opposite the clamping jaw 7, which rests on a shoulder formed by the remaining part of the base plate 2.
  • a mold is between the clamping jaw 7 and the clamping counter plate 10 arranged with an upper part 11 and a lower part 12.
  • a workpiece 13 formed by reshaping a tube.
  • the clamping jaw 7 has an upper part 14 with an annular recess into which one of the Bayonet ring engages inwardly projecting ring web 15. Below the ring web 14 is the jaws 7 slightly expanded in diameter.
  • the reference numeral 16 denotes a lower part of the clamping jaw 7, which one in the type of a pressure piston in a recess in the upper part 14 of the jaw 7 has guided upper section and with an annular shoulder 18 against the bottom of the Upper jaw part 14 can be applied.
  • the ring shoulder 18 bears against the underside of the upper jaw part 14 remains through the upper jaw part 14 and the Lower jaw part 16 formed back pressure chamber 17, which via a connecting channel 19 can be acted upon by fluid pressure.
  • the back pressure chamber 17 and the connecting channel 19 are lined with a sealing plastic membrane 20.
  • the bayonet ring 9 engages with locking teeth 21 arranged on its circumference in a Ring recess 22 in the cylinder wall 3, the locking teeth in a rotational position reach behind corresponding locking teeth 23 on the cylinder wall 3.
  • the bayonet ring can be lifted upwards with the clamping jaw 7 are, the locking teeth 21 of the bayonet ring 9 between the locking teeth 23rd be passed through on the cylinder wall 3.
  • the bayonet ring 9 with the clamping jaw 7 first lowered, the locking teeth 21 of the bayonet ring 9 between the locking teeth 23 on the upper edge of the cylinder wall 3 of the tool holder 1.
  • the bayonet ring is then rotated, the Teeth 21 of the bayonet ring 9 engage behind the locking teeth 23 on the cylinder wall 3.
  • the fluid pressure supply lines 26 and 27 in the manner shown in the figure via sealing means, not shown, to the tubular Workpiece 13 attached and a fluid, in the present case water, under pressure in introduced the workpiece.
  • a fluid in the present case water
  • fluid is injected into the back pressure chamber at the same pressure 17 let in.
  • the tubular workpiece deforms and increasingly creates the mold walls of the tool parts 11 and 12, which in particular in the vertical Direction between the jaws 7 and the upper tool part 11 or the jaw counter plate 10 and the lower tool part 12 effective pressing force is increased.
  • the tool holder 1 with the jaw counter plate 10 and the clamping jaw 7 formed clamping device, in particular in the region of the bayonet ring 9 is counteracted in that the prevailing in the back pressure chamber 17 Back pressure moves the lower jaw part 18 downwards to compensate, which thus holds the workpiece parts in place while keeping the height of the mold cavity constant Job holds.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Description

Die Erfindung betrifft eine Innenhochdruckumformvorrichtung mit einem mehrteiligen Formwerkzeug und einer die Teile des Formwerkzeugs gegen die Umformbeaufschlagung zusammenhaltenden Spanneinrichtung.The invention relates to a hydroforming device with a multi-part Mold and one of the parts of the mold against the deformation holding clamping device.

Beim Innenhochdruckumformen sind an die Festigkeit der Einspannung der Formwerkzeugteile sowie des Formwerkzeuges selbst hohe Anforderungen zu stellen. Vor allem in der Endphase der Herstellung eines Formteils, in der das Formteilwerkstück weitgehend gegen die Formungswände des Werkzeugformhohlraums anliegt, überträgt sich der zur vollständigen Ausformung des Werkstücks erforderliche sehr hohe Arbeitsdruck auf Werkzeug und Spanneinrichtung. Trotz dieser hoher Beanspruchung sollte es dabei jedoch zu keiner, die Maßhaltigkeit des Formteils beeinträchtigenden Deformationen des Formhohlraums kommen, indem z.B. Werkzeugteile des Formwerkzeugs zusammenhaltende Spannbacken unter Aufweitung des Formhohlraums nachgeben. Entsprechend stabil sind Werkzeuge und Spanneinrichtungen solcher Innenhochdruckumformvorrichtungen auszulegen.When hydroforming, the strength of the clamping of the mold parts is high as well as the mold itself. Especially in the final phase the production of a molded part in which the molded workpiece largely against Forming walls of the mold cavity is present, which is transferred to the complete Forming the workpiece requires very high working pressure on the tool and clamping device. Despite this high stress, there should not be any dimensional accuracy deformation of the mold cavity impairing the molded part, e.g. Tool parts of the mold holding the clamping jaws together with expansion of the mold cavity. Tools and clamping devices are correspondingly stable to design such internal high-pressure forming devices.

Aus der DE-A-4 432 692 ist eine gattungsbildende Innenhochdruckumformvorrichtung mit einer topfartigen Spannvorrichtung beschrieben. Ein Umformwerkzeug wird durch den Topf und einen darauf aufgesetzten, gegen den Topf und das Umformwerkzeug verspannbaren Deckel zusammen-gehalten. Zum Heben und Senken des Deckels steht ein Hubzylinder zur Verfügung.DE-A-4 432 692 describes a generic high pressure forming device described a pot-like clamping device. A forming tool is put through the pot and a placed on it, braced against the pot and the forming tool Lid held together. A lifting cylinder is available for lifting and lowering the lid Available.

Es ist die Aufgabe der vorliegenden Erfindung, eine neue Umformvorrichtung der eingangs erwähnten Art zu schaffen, die insbesondere in Bezug auf den zur Sicherung der Formstabilität des Formhohlraums erforderlichen Aufwand verbessert ist. It is the object of the present invention to develop a new forming device to create the kind mentioned, in particular with regard to ensuring the dimensional stability the mold cavity required effort is improved.

Die diese Aufgabe lösende Umformvorrichtung nach der Erfindung ist dadurch gekennzeichnet, daß die Spannvorrichtung oder/und das Formwerkzeug mindestens eine, Deformationen des Formhohlraums beim Umformen wenigstens teilweise kompensierende Gegenspanneinrichtung aufweist. The shaping device according to the invention which achieves this object is characterized in that that the clamping device and / or the mold at least one, deformations of the mold cavity at least partially compensating during forming Counter-tensioning device.

Entsprechend dieser Erfindungslösung nimmt man eine gewisse Verformung von Spanneinrichtung oder/und Werkzeug in Kauf, erzeugt aber durch Spannkraftbeaufschlagung über eine oder auch mehrere in der Spannvorrichtung oder/und dem Werkzeug vorgesehener Gegenspanneinrichtungen für ausgleichende Verformungen, so daß der Formhohlraum weitgehend seine Gestalt beibehält. Bei gleichbleibender Fertigungsgenauigkeit können Spann- und Werkzeugteile dementsprechend weniger stabil mit geringerem Aufwand an Material hergestellt werden. Vorteilhaft verringern sich damit auch Masse und Gewicht der Umformvorrichtung insgesamt.According to this solution of the invention, a certain deformation of the tensioning device is taken or / and tool in purchase, but generated by applying clamping force one or more provided in the clamping device and / or the tool Counter clamping devices for compensating deformations, so that the mold cavity largely maintains its shape. With constant manufacturing accuracy Accordingly, clamping and tool parts are less stable with less effort Material are made. This advantageously also reduces the mass and weight of the Total forming device.

Während mechanische, z.B. Keile aufweisende, Gegenspanneinrichtungen verwendbar sind, umfaßt in einer bevorzugten Ausführungsform der Erfindung die Gegenspanneinrichtung eine Gegendruckkammer.While mechanical, e.g. Wedges, counter-tensioning devices can be used are, in a preferred embodiment of the invention, the counter-tensioning device a back pressure chamber.

Die Gegendruckkammer kann mit dem Arbeitsdruck beaufschlagt werden, wobei vorteilhaft eine zur Druckbeaufschlagung des Werkstücks verwendete Einrichtung auch für die Gegendruckkammer mitgenutzt werden kann.The back pressure chamber can be subjected to the working pressure, which is advantageous a device used for pressurizing the workpiece also for the Back pressure chamber can be used.

Andererseits könnte jedoch für die Druckbeaufschlagung der Gegendruckkammer eine zusätzliche Einrichtung vorgesehen sein, die es ermöglicht, in der Gegendruckkammer einen ober- oder unterhalb des Arbeitsdrucks gelegenen Gegendruck zu erzeugen, der z.B. in Abhängigkeit von der jeweiligen Gestaltung des Werkzeugs bzw. herzustellenden Formteils im Hinblick auf eine optimale Kompensation von Formhohlraumverformungen eingestellt werden könnte.On the other hand, however, one could be used to pressurize the back pressure chamber additional device can be provided, which makes it possible in the back pressure chamber generate back pressure above or below the working pressure, e.g. dependent on from the respective design of the tool or molded part in Adjusted for optimal compensation of mold cavity deformations could be.

In einer Ausführungsform der Erfindung ist die Gegendruckkammer in einem gegen das Formwerkzeug anliegenden Spannbacken vorgesehen, wobei z.B. zwischen der Gegendruckkammer und dem Werkzeug eine verhältnismäßig dünne Spannbackenwandung vorgesehen sein kann, welche sich unter dem Einfluß des Gegendrucks gegen das Werkzeug wölbt und so einem Nachgeben des Spannbackens oder/und Werkzeugs entgegenwirkt.In one embodiment of the invention, the back pressure chamber is in one against the Forming tool adjacent clamping jaws provided, e.g. between the back pressure chamber and the tool provided a relatively thin clamping jaw wall can be, which is under the influence of the back pressure against the tool bulges and thus counteracts yielding of the clamping jaw or / and tool.

Alternativ könnte auf einer dem Werkzeug abgewandten Spannbackenseite ein Kurzhubzylinder, in dem die Gegendruckkammer gebildet ist, am Spannbacken angreifen.Alternatively, a short-stroke cylinder, in which the back pressure chamber is formed, engage the jaws.

Entsprechend einer besonders bevorzugten Ausführungsform der Erfindung liegt der Spannbacken gegen das Formwerkzeug mit einem durch die Druckbeaufschlagung der Gegendruckkammer gegen den übrigen Spannbacken beweglichen Teil des Spannbackens an, wobei dieser bewegliche Teil insbesondere in der Art eines in dem Spannbacken geführten Druckkolbens ausgebildet ist. Gibt der Spannbacken unter dem Einfluß der Umformungsbeaufschlagung eines Werkstücks nach, so verschiebt sich der Spannbackenkolben bei Aufrechterhaltung eines geeigneten Drucks in der Gegendruckkammer entsprechend, so daß der dagegen anliegende Werkzeugteil an Ort und Stelle verbleibt.According to a particularly preferred embodiment of the invention, the clamping jaw lies against the mold with one by pressurizing the back pressure chamber against the rest of the jaws movable part of the jaw, this movable part in particular in the manner of a guided in the jaw Pressure piston is formed. Gives the jaws under the influence of the deformation after a workpiece, the clamping piston moves Maintaining a suitable pressure in the back pressure chamber accordingly, so that the tool part against it remains in place.

Diese Ausführungsform mit einem beweglichen Spannbackenteil ist besonders vorteilhaft in einer Innenhochdruckumformvorrichtung, in welcher der Spannbacken über einen Bajonettring in Spannanlage gegen das Werkzeug gebracht werden kann, wobei eine einen Gegenspannbacken umfassende Werkzeughalterung für den Bajonettring ein Gegenlager bildet. Durch die Kompensationsmöglichkeit über den Spannbacken mit der Gegendruckkammer entschärfen sich vor allem die Festigkeitsanforderungen an die Verriegelungsteile des Bajonettverschlusses, die somit weniger massiv ausgebildet zu sein brauchen.This embodiment with a movable jaw part is particularly advantageous in an internal high-pressure forming device, in which the clamping jaws via a bayonet ring can be brought into the clamping system against the tool, one being a Tool holder for the bayonet ring and a counter bearing forms. Due to the possibility of compensation via the jaws with the back pressure chamber Above all, defuse the strength requirements for the locking parts the bayonet lock, which therefore need to be less solid.

In einer weiteren bevorzugten Ausführungsform der Erfindung ist die Gegendruckkammer, einschließlich eines Druckverbindungskanals, mit einer abdichtenden Auskleidung versehen, die insbesondere durch eine die Gegendruckkammer ballonartig ausfüllende Kunststoffmembran gebildet sein kann. Eine solche flexible Abdichtungsauskleidung ist vor allem bei der genannten Ausführungsform mit einem druckkolbenartigen Spannbackenteil von Vorteil, weil dann der Druckkolben in seiner Führung nicht besonders abgedichtet zu sein braucht.In a further preferred embodiment of the invention, the back pressure chamber is including a pressure connection channel, provided with a sealing lining, which, in particular, through a plastic membrane that fills the counter-pressure chamber like a balloon can be formed. Such a flexible sealing liner is mainly used for the embodiment mentioned with a pressure piston-like jaw part is advantageous, because then the pressure piston is not particularly sealed in its guidance needs.

Die Erfindung soll nun anhand eines Ausführungsbeispiels und der beiliegenden, sich auf dieses Ausführungsbeispiel beziehenden Zeichnung beschrieben werden.The invention will now be based on an embodiment and the accompanying this embodiment relating to the drawing will be described.

Die Zeichnung zeigt eine Innenhochdruckumformeinrichtung in einer Schnittdarstellung.The drawing shows a hydroforming device in a sectional view.

In der Figur ist eine topfartig ausgebildete Werkzeughalterung 1 mit einer Bodenwand 2 und einer vertikalen Zylinderwand 3 gezeichnet. In der Bodenwand 2 ist ein sich über einen großen Teil der Wandfläche erstreckender Durchbruch 4 vorgesehen. In der Zylinderwand 3 sind einander gegenüberliegende Durchbrüche 5 und 6 gebildet.In the figure is a pot-shaped tool holder 1 with a bottom wall 2 and a vertical cylinder wall 3 drawn. In the bottom wall 2 is one over one Large part of the wall surface extending opening 4 is provided. In the cylinder wall 3 opposite openings 5 and 6 are formed.

Ein Spannbacken 7 steht mit einem dagegen über einen Hydraulikzylinder 8 drehbaren Bajonettring 9 im Eingriff.A clamping jaw 7 is on the other hand rotatable via a hydraulic cylinder 8 Bayonet ring 9 in engagement.

Dem Spannbacken 7 gegenüberliegend ist eine Spannbackengegenplatte 10 angeordnet, die auf einer durch den verbliebenen Teil der Bodenplatte 2 gebildeten Schulter aufliegt. A clamping jaw counter plate 10 is arranged opposite the clamping jaw 7, which rests on a shoulder formed by the remaining part of the base plate 2.

Zwischen dem Spannbacken 7 und der Spannbackengegenplatte 10 ist ein Formwerkzeug mit einem Oberteil 11 und einem Unterteil 12 angeordnet. In dem zweiteiligen Formteilwerkzeug befindet sich ein durch Umformung eines Rohres gebildetes Werkstück 13.A mold is between the clamping jaw 7 and the clamping counter plate 10 arranged with an upper part 11 and a lower part 12. In the two-part molding tool there is a workpiece 13 formed by reshaping a tube.

Der Spannbacken 7 weist ein Oberteil 14 mit einer Ringausnehmung auf, in die ein von dem Bajonettring nach innen vorstehender Ringsteg 15 eingreift. Unterhalb des Ringstegs 14 ist der Spannbacken 7 im Durchmesser etwas aufgeweitet. Mit dem Bezugszeichen 16 ist ein unterer Teil des Spannbackens 7 bezeichnet, der einen in der Art eines Druckkolbens in einer Ausnehmung in dem oberen Teil 14 des Spannbackens 7 geführten oberen Abschnitt aufweist und mit einer Ringschulter 18 gegen die Unterseite des Spannbackenoberteils 14 anlegbar ist. Bei Anlage der Ringschulter 18 gegen die Unterseite des Spannbackenoberteils 14 verbleibt eine durch das Spannbackenoberteil 14 und das Spannbackenunterteil 16 gebildete Gegendruckkammer 17, die über einen Verbindungskanal 19 durch Fluiddruck beaufschlagbar ist. Die Gegendruckkammer 17 und der Verbindungskanal 19 sind durch eine abdichtende Kunststoffmembran 20 ausgekleidet.The clamping jaw 7 has an upper part 14 with an annular recess into which one of the Bayonet ring engages inwardly projecting ring web 15. Below the ring web 14 is the jaws 7 slightly expanded in diameter. The reference numeral 16 denotes a lower part of the clamping jaw 7, which one in the type of a pressure piston in a recess in the upper part 14 of the jaw 7 has guided upper section and with an annular shoulder 18 against the bottom of the Upper jaw part 14 can be applied. When the ring shoulder 18 bears against the underside of the upper jaw part 14 remains through the upper jaw part 14 and the Lower jaw part 16 formed back pressure chamber 17, which via a connecting channel 19 can be acted upon by fluid pressure. The back pressure chamber 17 and the connecting channel 19 are lined with a sealing plastic membrane 20.

Der Bajonettring 9 greift mit auf seinem Umfang angeordneten Verschlußzähnen 21 in eine Ringausnehmung 22 in der Zylinderwand 3 ein, wobei die Verschlußzähne in einer Drehstellung entsprechende Verschlußzähne 23 an der Zylinderwand 3 hintergreifen. In einer anderen Drehstellung kann der Bajonettring mit dem Spannbacken 7 nach oben abgehoben werden, wobei die Verschlußzähne 21 des Bajonettrings 9 zwischen den Verschlußzähnen 23 an der Zylinderwand 3 hindurchgeführt werden.The bayonet ring 9 engages with locking teeth 21 arranged on its circumference in a Ring recess 22 in the cylinder wall 3, the locking teeth in a rotational position reach behind corresponding locking teeth 23 on the cylinder wall 3. In another The bayonet ring can be lifted upwards with the clamping jaw 7 are, the locking teeth 21 of the bayonet ring 9 between the locking teeth 23rd be passed through on the cylinder wall 3.

Mit den Bezugszahlen 24 und 25 sind bewegbare Halterungen für an das Werkstück 13 anlegbare Druckfluidzuführungsleitungen 26 und 27 bezeichnet.With the reference numbers 24 and 25 are movable holders for attachable to the workpiece 13 Pressure fluid supply lines 26 and 27 designated.

Die Bewegung des Spannbackenunterteils 16 nach unten begrenzende Gegenanschläge sind in der Figur nicht gezeigt.Counterstops limiting the movement of the lower jaw part 16 downward are not shown in the figure.

Im folgenden wird die Funktionsweise der vorangehend beschriebenen Vorrichtung erläutert.The mode of operation of the device described above is explained below.

In einem Zustand, in welchem der Bajonettverschluß mit dem Spannbacken 7 von dem topfartigen Werkzeughalter 1 abgehoben ist, wird eine für den gegebenen Anwendungsfall geeignete Spannbackengegenplatte 10 auf den Boden 2 des Werkzeugshalters 1 aufgelegt. Danach werden der untere Teil 12 des Werkzeugs, das Werkstück 13 und der obere Teil 11 des Werkzeugs eingesetzt. In a state in which the bayonet lock with the jaw 7 of the pot-like tool holder 1 is lifted, one for the given application suitable jaw counter plate 10 placed on the bottom 2 of the tool holder 1. Then the lower part 12 of the tool, the workpiece 13 and the upper part 11 of the tool used.

Zur Verspannung der Werkzeugteile 11 und 12 wird der Bajonettring 9 mit dem Spannbacken 7 zunächst abgesenkt, wobei die Verschlußzähne 21 des Bajonettrings 9 zwischen den Verschlußzähnen 23 an dem oberen Rand der Zylinderwand 3 des Werkzeugshalters 1 hindurchtreten. Mit Hilfe des Hydraulikzylinders 8 wird dann der Bajonettring verdreht, wobei die Zähne 21 des Bajonettrings 9 die Verschlußzähne 23 an der Zylinderwand 3 hintergreifen. Durch geeignete Abschrägung der Zähne wird dabei ein Preßdruck des Spannbackens 7 gegen den oberen Werkzeugteil 11 und ein entsprechender Preßgegendruck über den Werkzeughalter 1 und die Spannbackengegenplatte 10 auf den Werkzeugunterteil 12 übertragen.To clamp the tool parts 11 and 12, the bayonet ring 9 with the clamping jaw 7 first lowered, the locking teeth 21 of the bayonet ring 9 between the locking teeth 23 on the upper edge of the cylinder wall 3 of the tool holder 1. With the help of the hydraulic cylinder 8, the bayonet ring is then rotated, the Teeth 21 of the bayonet ring 9 engage behind the locking teeth 23 on the cylinder wall 3. By suitable beveling of the teeth, a pressing pressure of the clamping jaw 7 against the upper tool part 11 and a corresponding pressure back pressure over the Transfer the tool holder 1 and the jaw counter plate 10 to the lower tool part 12.

Zum Umformen des Werkstücks werden nun die Fluiddruckzuführungsleitungen 26 und 27 in der in der Figur gezeigten Weise über nicht gezeigte Dichtungseinrichtungen an das rohrförmige Werkstück 13 angesetzt und ein Fluid, im vorliegenden Fall Wasser, unter Druck in das Werkstück eingebracht. Gleichzeitig wird Fluid unter gleichem Druck in die Gegendruckkammer 17 eingelassen.To deform the workpiece, the fluid pressure supply lines 26 and 27 in the manner shown in the figure via sealing means, not shown, to the tubular Workpiece 13 attached and a fluid, in the present case water, under pressure in introduced the workpiece. At the same time, fluid is injected into the back pressure chamber at the same pressure 17 let in.

Unter dem Fluiddruck verformt sich das rohrförmige Werkstück und legt sich zunehmend an die Formwände der Werkzeugteile 11 und 12 an, wodurch die insbesondere in vertikaler Richtung zwischen den Spannbacken 7 und dem oberen Werkzeugteil 11 bzw. der Spannbackengegenplatte 10 und dem unteren Werkzeugteil 12 wirksame Preßkraft erhöht wird. Einem Nachgeben der durch den Werkzeughalter 1 mit der Spannbackengegenplatte 10 und den Spannbacken 7 gebildeten Spannvorrichtung, insbesondere im Bereich des Bajonettrings 9, wird dadurch entgegengewirkt, daß der in der Gegendruckkammer 17 herrschende Gegendruck den Spannbackenunterteil 18 zum Ausgleich nach unten verschiebt, der so die Werkstückteile unter Konstanthaltung der Höhe des Formhohlraums an Ort und Stelle hält.Under the fluid pressure, the tubular workpiece deforms and increasingly creates the mold walls of the tool parts 11 and 12, which in particular in the vertical Direction between the jaws 7 and the upper tool part 11 or the jaw counter plate 10 and the lower tool part 12 effective pressing force is increased. Giving in by the tool holder 1 with the jaw counter plate 10 and the clamping jaw 7 formed clamping device, in particular in the region of the bayonet ring 9, is counteracted in that the prevailing in the back pressure chamber 17 Back pressure moves the lower jaw part 18 downwards to compensate, which thus holds the workpiece parts in place while keeping the height of the mold cavity constant Job holds.

Claims (12)

  1. Internal high-pressure forming apparatus having a multi-piece forming tool and a clamping device (1, 7, 9, 10) holding the parts (11, 12) of the forming tool together against the pressurizing during the forming, characterized in that the clamping device and/or the forming tool has at least one counter-clamping device (16-20) at least partly compensating for deformations of the forming cavity during the forming.
  2. Internal high-pressure forming apparatus according to Claim 1, characterized in that the counter-clamping device comprises a counter-pressure chamber (17).
  3. Internal high-pressure forming apparatus according to Claim 2, characterized in that the counter-pressure chamber (17) is provided for pressurizing with the working pressure (Pi) of the forming apparatus.
  4. Internal high-pressure forming apparatus according to Claim 2 or 3, characterized in that a pressurizing device independent of the generation of the working pressure and intended for pressurizing with an particularly adjustable pressure is provided for the counter-pressure chamber.
  5. Internal high-pressure forming apparatus according to one of Claims 2 to 4, characterized in that the counter-pressure chamber (17) is provided in a clamping jaw (7) bearing against the forming tool (11, 12).
  6. Internal high-pressure forming apparatus according to Claim 5, characterized in that the clamping jaw (7) bears against the forming tool (11, 12) with a clamping-jaw part (18) which can be moved against the other clamping jaw part by the pressurizing of the counter-pressure chamber (17).
  7. Internal high-pressure forming apparatus according to Claim 6, characterized in that the movable part (18) of the clamping jaw has a section formed like a pressure cylinder guided in the clamping jaw.
  8. Internal high-pressure forming apparatus according to one of Claims 5 to 7, characterized in that the clamping jaw (7) can be pressed against the tool (11, 12) via a bayonet ring (9), a forming-tool holder (1) accommodating a counter-clamping jaw (10) and forming an abutment for the bayonet ring.
  9. Internal high-pressure forming apparatus according to Claim 8, characterized in that the tool holder (1) is of pot-like design, in particular with a counter-clamping jaw (10) which can be placed against the pot base (2).
  10. Internal high-pressure forming apparatus according to one of Claims 2 to 9, characterized in that the counter-pressure chamber (17), in particular including a pressure connecting passage (19), is provided with a sealing lining (20).
  11. Internal high-pressure forming apparatus according to Claim 10, characterized in that the lining is formed by a plastic diaphragm (20) filling the counter-pressure chamber (17) like a balloon.
  12. Internal high-pressure forming apparatus according to one of Claims 1 to 12, characterized in that the counter-pressure chamber and/or a further counter-pressure chamber is formed in a short-stroke cylinder acting on a clamping jaw.
EP98102248A 1997-02-12 1998-02-10 Forming apparatus Expired - Lifetime EP0858848B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE19705244A DE19705244A1 (en) 1997-02-12 1997-02-12 Forming device
EP98102248A EP0858848B1 (en) 1997-02-12 1998-02-10 Forming apparatus
DE29823606U DE29823606U1 (en) 1997-02-12 1998-02-10 Forming device
US09/154,725 US6041633A (en) 1997-02-12 1998-09-17 Forming apparatus

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19705244 1997-02-12
DE19705244A DE19705244A1 (en) 1997-02-12 1997-02-12 Forming device
EP98102248A EP0858848B1 (en) 1997-02-12 1998-02-10 Forming apparatus
DE29823606U DE29823606U1 (en) 1997-02-12 1998-02-10 Forming device
US09/154,725 US6041633A (en) 1997-02-12 1998-09-17 Forming apparatus

Publications (2)

Publication Number Publication Date
EP0858848A1 EP0858848A1 (en) 1998-08-19
EP0858848B1 true EP0858848B1 (en) 2001-10-17

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EP98102248A Expired - Lifetime EP0858848B1 (en) 1997-02-12 1998-02-10 Forming apparatus

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US (1) US6041633A (en)
EP (1) EP0858848B1 (en)
DE (2) DE19705244A1 (en)

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Also Published As

Publication number Publication date
EP0858848A1 (en) 1998-08-19
DE29823606U1 (en) 1999-09-02
DE19705244A1 (en) 1998-08-13
US6041633A (en) 2000-03-28

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