EP2036628B1 - Device and method for creating a workpiece with convexity using a pressure medium - Google Patents

Device and method for creating a workpiece with convexity using a pressure medium Download PDF

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Publication number
EP2036628B1
EP2036628B1 EP08016051A EP08016051A EP2036628B1 EP 2036628 B1 EP2036628 B1 EP 2036628B1 EP 08016051 A EP08016051 A EP 08016051A EP 08016051 A EP08016051 A EP 08016051A EP 2036628 B1 EP2036628 B1 EP 2036628B1
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EP
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Prior art keywords
workpiece
pressure medium
mold
base plate
mold halves
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EP08016051A
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German (de)
French (fr)
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EP2036628A1 (en
Inventor
Bernd Schulze
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fischer Hydroforming GmbH
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Individual
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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
    • B21D26/033—Deforming tubular bodies
    • B21D26/047—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
    • B21D26/033—Deforming tubular bodies
    • B21D26/039—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
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/08—Tube expanders
    • B21D39/20—Tube expanders with mandrels, e.g. expandable
    • B21D39/203—Tube expanders with mandrels, e.g. expandable expandable by fluid or elastic material

Definitions

  • the ends of the workpiece sealingly engage in a recess of the hydroforming die enclosing a cone, wherein subsequently a pressure medium for generating an internal pressure in the hollow profile-shaped workpiece to be deformed is fed in by a feed provided in the first mold half.
  • a pressure medium for generating an internal pressure in the hollow profile-shaped workpiece to be deformed is fed in by a feed provided in the first mold half.
  • a corresponding pressure booster is required to increase the internal pressure.
  • the tool halves continue to press together under pressure until the tool is closed, whereby the workpiece has created to realize its final shape of the engraving / negative mold of the tool.
  • a vent hole for the pressure medium is in the second mold half, which may be a virtually incompressible liquid, such as water or a water-oil mixture.
  • a disadvantage of this solution is that the filling of the workpiece cavity with the printing medium as an independent, the cycle time increasing process can be done after inserting the workpiece in the tool, with the ends of the workpiece by moving the mold halves already in its sealing position in the recess the tool halves must be located. There is a risk that the workpiece buckles and comes to rest in the division plane between the tool halves. In addition, a series-steady insertion of the workpieces is not guaranteed because the cones alone do not contribute enough to the orthogonal guidance of the workpiece. Ultimately, the removal of the workpieces causes difficulties in that they can jam in the recess of one of the two mold halves. To increase the internal pressure, a pressure booster is necessary for the direct pressurization.
  • the object of the invention is to propose a solution in which the filling of the cavity of the workpiece with the printing medium as a separate, the cycle time increasing process can be dispensed with, as well as to the already required at this time realization of the sealing position at the ends of the workpiece.
  • a buckling of the workpiece is excluded, created the conditions for a reliable insertion of the workpiece and the trouble-free removal of the workpiece are possible.
  • no pressure booster should be required for the increase of the internal pressure.
  • the advantages of the invention are that can be dispensed with the filling medium of the workpiece with the pressure medium as a separate, the cycle time increasing process, because this when inserting into the already located in the pressure medium of the container lower mold half of the device completely with the print medium is filled.
  • the realization of the sealing position at the ends of the workpiece is not required at this time.
  • a buckling of the workpiece is prevented, created the conditions for a reliable insertion of the workpieces and allows easy removal of the workpieces.
  • a device 1 for producing a bulge 2 ( Fig. 3 ) having workpiece 3 by means of a pressure medium 11.
  • This device 1 consists of two transverse to the longitudinal axis 4 of the workpiece 3 divided tool halves, the lower mold half 5 and the upper mold half 6, which have a later final shape of the workpiece corresponding engraving / negative mold 7.
  • the tool halves 5, 6 are associated with distance springs 8, via which they are each connected to a lower tool base plate 9 and an upper tool base plate 10.
  • the tool base plates 9, 10 cooperate with a press, not shown.
  • the lower tool base plate 9 is associated with a used as a pressure medium 11 incompressible liquid, preferably water, filled container 12, in which at least the workpiece 3 is completely immersed.
  • the lower and upper mold base plates 9, 10 each have a (lower and upper) punch 14, 15 for the mutual engagement in the cavity 13 of the workpiece 3.
  • a channel 16 is arranged in the lower tool base plate 9 and its punch 14.
  • the lower tool base plate 9 includes an inlet and outlet 17 for the incompressible fluid used as the pressure medium 11. This inlet and outlet 17 can also be arranged on the container 12.
  • at least one of the tool halves 5, 6 is equipped with a displacement channel 18 for the pressure medium 11, as a result of which the liquid pressure medium 11 can escape from the space between the workpiece 3 and the engraved / negative mold 7.
  • this displacement channel 18 is arranged in the dividing plane between the two mold halves 5, 6.

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

Abstract

The method involves inserting a work piece (3) into a mold half (5) of the material-deforming tool. The mold half is already placed in a container (12) as a pressure medium (11). The reforming process is completed for the realization of an end shape of the work piece by the large displacement of the pressure media. An independent claim is included for a device for manufacturing a work piece with convexity by a pressure medium.

Description

Aus der DE 10 2005 036 419 A1 ist ein Verfahren und eine Vorrichtung zur Herstellung eines Ausbuchtungen (Nebenformen) aufweisenden Werkstückes mittels eines Druckmediums bekannt (Innenhochdruckumformung) gemäß dem Oberbegriff des Anspruchs 1 bzw. 3. Dabei weist das aus zwei quer zur Längsachse des Werkstückes geteilten Werkzeughälften bestehende Innenhochdruckumformwerkzeug eine der späteren Endform des Werkstückes entsprechende Gravur/Negativform auf, wobei das zu verformende, hohlprofilförmige Werkstück in das Werkzeug eingelegt und durch eine auf dessen Enden wirkende axiale Druckkraft gestaucht wird. Während des Stauchvorganges greifen die Enden des Werkstückes in eine einen Konus umschließende Ausnehmung des Innenhochdruckumformwerkzeuges dichtend ein, wobei nachfolgend durch eine in der ersten Werkzeughälfte vorgesehene Zuführung ein Druckmedium zur Erzeugung eines Innendruckes im zu verformenden, hohlprofilförmigen Werkstück eingespeist wird. Zu dieser direkten Druckbeaufschlagung ist zur Erhöhung des Innendruckes ein entsprechender Druckübersetzer erforderlich. Dabei fahren die Werkzeughälften unter Druckbeaufschlagung weiter zusammen bis das Werkzeug geschlossen ist, wodurch sich das Werkstück zur Realisierung seiner Endform an die Gravur/Negativform des Werkzeuges angelegt hat. Letztlich ist in der zweiten Werkzeughälfte eine Entlüftungsbohrung für das Druckmedium befindlich, welches eine praktisch inkompressible Flüssigkeit, beispielsweise Wasser oder ein Wasser-Ölgemisch, sein kann.From the DE 10 2005 036 419 A1 a method and an apparatus for producing a protrusions (Nebenformen) having workpiece by means of a pressure medium known (hydroforming) according to the preamble of claim 1 or 3. In this case, consisting of two divided transversely to the longitudinal axis of the workpiece mold halves hydroforming has a later final form the workpiece corresponding engraving / negative mold, wherein the hollow profile-shaped workpiece to be deformed is inserted into the tool and compressed by acting on the ends of axial compressive force. During the upsetting process, the ends of the workpiece sealingly engage in a recess of the hydroforming die enclosing a cone, wherein subsequently a pressure medium for generating an internal pressure in the hollow profile-shaped workpiece to be deformed is fed in by a feed provided in the first mold half. For this direct pressurization, a corresponding pressure booster is required to increase the internal pressure. The tool halves continue to press together under pressure until the tool is closed, whereby the workpiece has created to realize its final shape of the engraving / negative mold of the tool. Finally, a vent hole for the pressure medium is in the second mold half, which may be a virtually incompressible liquid, such as water or a water-oil mixture.

Nachteilig bei dieser Lösung ist, dass die Befüllung des Werkstückhohlraumes mit dem Druckmedium als eigenständiger, die Taktzeit erhöhender Vorgang erst nach dem Einlegen des Werkstückes in das Werkzeug erfolgen kann, wobei sich die Enden des Werkstückes durch Zusammenfahren der Werkzeughälften bereits in ihrer Dichtposition in der Ausnehmung der Werkzeughälften befinden müssen. Dabei besteht die Gefahr, dass das Werkstück ausknickt und in der Teilungsebene zwischen den Werkzeughälften zu liegen kommt. Außerdem ist ein serienstabiles Einlegen der Werkstücke nicht gewährleistet, da die Konen allein nicht ausreichend zur orthogonalen Führung des Werkstückes beitragen. Letztlich bereitet die Entnahme der Werkstücke Schwierigkeiten dahingehend, weil sich diese in der Ausnehmung einer der beiden Werkzeughälften verklemmen können. Zur Erhöhung des Innendruckes ist für die direkte Druckbeaufschlagung ein Druckübersetzer notwendig.A disadvantage of this solution is that the filling of the workpiece cavity with the printing medium as an independent, the cycle time increasing process can be done after inserting the workpiece in the tool, with the ends of the workpiece by moving the mold halves already in its sealing position in the recess the tool halves must be located. There is a risk that the workpiece buckles and comes to rest in the division plane between the tool halves. In addition, a series-steady insertion of the workpieces is not guaranteed because the cones alone do not contribute enough to the orthogonal guidance of the workpiece. Ultimately, the removal of the workpieces causes difficulties in that they can jam in the recess of one of the two mold halves. To increase the internal pressure, a pressure booster is necessary for the direct pressurization.

Die Aufgabe der Erfindung besteht darin, eine Lösung vorzuschlagen, bei der auf das Befüllen des Hohlraumes des Werkstückes mit dem Druckmedium als separater, die Taktzeit erhöhender Vorgang ebenso verzichtet werden kann, wie auf die bereits zu diesem Zeitpunkt erforderliche Realisierung der Dichtposition an den Enden des Werkstückes. Außerdem sollen ein Ausknicken des Werkstückes ausgeschlossen, die Voraussetzungen für ein serienstabiles Einlegen des Werkstückes geschaffen und die problemlose Entnahme des Werkstückes ermöglicht werden. Letztlich soll auf die Verwendung eines Druckübersetzers verzichtet werden können. Außerdem soll für die Erhöhung des Innendruckes kein Druckübersetzer erforderlich sein.The object of the invention is to propose a solution in which the filling of the cavity of the workpiece with the printing medium as a separate, the cycle time increasing process can be dispensed with, as well as to the already required at this time realization of the sealing position at the ends of the workpiece. In addition, a buckling of the workpiece is excluded, created the conditions for a reliable insertion of the workpiece and the trouble-free removal of the workpiece are possible. Ultimately, it should be possible to dispense with the use of a pressure booster. In addition, no pressure booster should be required for the increase of the internal pressure.

Diese Aufgabe wird bei einem gattungsgemäßen Verfahren mit den im Kennzeichen des Patentanspruchs 1 angegebenen Merkmalen gelöst, wobei dessen Ausgestaltung aus Patentanspruch 2 ersichtlich ist.
Eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens geht aus Patentanspruch 3 hervor, wobei deren vorteilhafte Weiterbildungen in den Patentansprüchen 4 bis 7 offenbart sind.This object is achieved in a generic method with the features specified in the characterizing part of patent claim 1, wherein the embodiment of claim 2 can be seen.
A device for carrying out the method according to the invention is apparent from claim 3, wherein the advantageous developments are disclosed in the claims 4 to 7.

Die Vorteile der Erfindung bestehen darin, dass auf das Befüllen des Hohlraumes des Werkstückes mit dem Druckmedium als separater, die Taktzeit erhöhender Vorgang verzichtet werden kann, weil dieses beim Einlegen in die sich bereits im Druckmedium des Behälters befindliche untere Werkzeughälfte der Vorrichtung vollständig mit dem Druckmedium gefüllt wird. Außerdem ist zu diesem Zeitpunkt die Realisierung der Dichtposition an den Enden des Werkstückes nicht erforderlich. Darüber hinaus werden ein Ausknicken des Werkstückes verhindert, die Voraussetzungen für ein serienstabiles Einlegen der Werkstücke geschaffen und die problemlose Entnahme der Werkstücke ermöglicht. Letztlich kann zur Erhöhung des Innendruckes auf die Verwendung eines Druckübersetzers verzichtet werden, da die Druckerzeugung über die beim Stauchvorgang erfolgende Reduzierung des das Werkstück einschließenden Volumens und/ oder durch das weitere Eindringen der Stempel in den Hohlraum des Werkstückes vorgenommen wird.The advantages of the invention are that can be dispensed with the filling medium of the workpiece with the pressure medium as a separate, the cycle time increasing process, because this when inserting into the already located in the pressure medium of the container lower mold half of the device completely with the print medium is filled. In addition, the realization of the sealing position at the ends of the workpiece is not required at this time. In addition, a buckling of the workpiece is prevented, created the conditions for a reliable insertion of the workpieces and allows easy removal of the workpieces. Ultimately, can be dispensed with to increase the internal pressure on the use of a pressure booster, since the pressure generation is carried out on the taking place during the upsetting process reduction of the workpiece enclosing volume and / or by the further penetration of the stamp in the cavity of the workpiece.

Die Erfindung soll nachfolgend an einem Ausführungsbeispiel und zugehöriger Zeichnungen näher erläutert werden.The invention will be explained in more detail below using an exemplary embodiment and associated drawings.

Es zeigen:

Fig. 1
eine geschnittene Seitenansicht des prinzipiellen Aufbaus der erfindungsgemäßen Vorrichtung zur Herstellung eines Ausbuchtungen aufweisenden Werkstückes mittels eines Druckmediums in geöffnetem, mit dem Werkstück bereits beschickten Zustand
Fig. 2
eine geschnittene Seitenansicht der erfindungsgemäßen Vorrichtung, bei der die Dichtposition der Stempel unmittelbar vor der Umformung eingenommen worden ist
Fig. 3
eine geschnittene Seitenansicht der erfindungsgemäßen Vorrichtung, in der die Vorrichtung vollständig geschlossen (Endposition) und die Umformung des Werkstückes erfolgt ist
Show it:
Fig. 1
a sectional side view of the basic structure of Inventive device for producing a bulge having workpiece by means of a pressure medium in open, already loaded with the workpiece state
Fig. 2
a sectional side view of the device according to the invention, in which the sealing position of the stamp has been taken immediately before the forming
Fig. 3
a sectional side view of the device according to the invention, in which the device is completely closed (end position) and the deformation of the workpiece is done

In der Fig. 1 ist eine Vorrichtung 1 zur Herstellung eines Ausbuchtungen 2 (Fig. 3) aufweisenden Werkstückes 3 mittels eines Druckmediums 11 dargestellt. Diese Vorrichtung 1 besteht aus zwei quer zur Längsachse 4 des Werkstückes 3 geteilten Werkzeughälften, der unteren Werkzeughälfte 5 und der oberen Werkzeughälfte 6, welche eine der späteren Endform des Werkstückes entsprechende Gravur/Negativform 7 aufweisen. Den Werkzeughälften 5, 6 sind Distanzfedern 8 zugeordnet, über die diese jeweils mit einer unteren Werkzeuggrundplatte 9 und einer oberen Werkzeuggrundplatte 10 verbunden sind.
Die Werkzeuggrundplatten 9, 10 wirken mit einer nicht gezeigten Presse zusammen. Der unteren Werkzeuggrundplatte 9 ist ein mit einer als Druckmedium 11 verwendeten inkompressiblen Flüssigkeit, vorzugsweise Wasser, gefüllter Behälter 12 zugeordnet, in dem zumindest das Werkstück 3 vollständig eintaucht. Außerdem weisen die untere und obere Werkzeuggrundplatte 9, 10 jeweils einen (unteren bzw. oberen) Stempel 14, 15 für den beiderseitigen Eingriff in den Hohlraum 13 des Werkstückes 3 auf. Für ein nicht dargestelltes Überdrückventil ist in der unteren Werkzeuggrundplatte 9 und deren Stempel 14 ein Kanal 16 angeordnet. Außerdem beinhaltet die untere Werkzeuggrundplatte 9 einen Zu- und Ablauf 17 für die als Druckmedium 11 verwendete inkompressible Flüssigkeit. Dieser Zu- und Ablauf 17 kann auch am Behälter 12 angeordnet sein. Letztlich ist mindestens eine der Werkzeughälften 5, 6 mit einem Verdrängungskanal 18 für das Druckmedium 11 ausgestattet, wodurch das flüssige Druckmedium 11 aus dem Raum zwischen Werkstück 3 und Gravur/Negativform 7 entweichen kann. Vorzugsweise ist dieser Verdrängungskanal 18 in der Teilungsebene zwischen den beiden Werkzeughälften 5, 6 angeordnet.In the Fig. 1 is a device 1 for producing a bulge 2 ( Fig. 3 ) having workpiece 3 by means of a pressure medium 11. This device 1 consists of two transverse to the longitudinal axis 4 of the workpiece 3 divided tool halves, the lower mold half 5 and the upper mold half 6, which have a later final shape of the workpiece corresponding engraving / negative mold 7. The tool halves 5, 6 are associated with distance springs 8, via which they are each connected to a lower tool base plate 9 and an upper tool base plate 10.
The tool base plates 9, 10 cooperate with a press, not shown. The lower tool base plate 9 is associated with a used as a pressure medium 11 incompressible liquid, preferably water, filled container 12, in which at least the workpiece 3 is completely immersed. In addition, the lower and upper mold base plates 9, 10 each have a (lower and upper) punch 14, 15 for the mutual engagement in the cavity 13 of the workpiece 3. For an overpressure valve, not shown, a channel 16 is arranged in the lower tool base plate 9 and its punch 14. In addition, the lower tool base plate 9 includes an inlet and outlet 17 for the incompressible fluid used as the pressure medium 11. This inlet and outlet 17 can also be arranged on the container 12. Finally, at least one of the tool halves 5, 6 is equipped with a displacement channel 18 for the pressure medium 11, as a result of which the liquid pressure medium 11 can escape from the space between the workpiece 3 and the engraved / negative mold 7. Preferably, this displacement channel 18 is arranged in the dividing plane between the two mold halves 5, 6.

Nachfolgend soll die Funktionsweise des erfindungsgemäßen Verfahrens und der danach arbeitenden Vorrichtung erläutert werden:

  • Gemäß Fig. 1 wird das umzuformende, hohlprofilförmige und beispielhaft als Rohr ausgeführte Werkstück 3, z. B. mittels entsprechender Handhabungstechnik, in die geöffnete Vorrichtung 1 unter lagebestimmter Aufnahme durch den unteren Stempel 14 in die untere Werkzeughälfte 5 eingelegt, wobei sich diese Werkzeughälfte 5 bereits in dem mit der als Druckmedium 11 verwendeten inkompressiblen Flüssigkeit (Wasser) gefüllten Behälter 12 befindet, so dass zumindest das Werkstück 3 vollständig mit der Flüssigkeit gefüllt und umgeben wird. Durch das anschließende Zusammenfahren der Werkzeughälften 5, 6 erfolgt eine Abdichtung der Enden des Werkstückes 3. Dabei wird durch eine Presse eine axiale Druckkraft auf das Werkstück 3 aufgebracht, so dass über die an den Werkstückenden in den Hohlraum 13 abdichtend eingreifenden und an der unteren und oberen Werkzeuggrundplatte 9, 10 vorgesehenen unteren und oberen Stempel 14, 15 die Verdrängung des Druckmediums 11 einsetzt. Damit zu diesem Zeitpunkt aufgrund eines zu hohen Innendruckes im Hohlraum 13 ein Ausknicken des Werkstückes 3 unterbunden werden kann, findet über den im Stempel 14 vorgesehenen Kanal 16 in Verbindung mit dem Ãœberdrückventil ein Druckausgleich statt. In dieser Phase des Verfahrens werden die Werkzeughälften 5, 6 durch die Distanzfedern 8 in einem Abstand zur unteren und oberen Werkzeuggrundplatte 9, 10 gehalten (Fig. 2). Durch die weiterhin gegen die Distanzfedern 8 aufgebrachte Presskraft und den damit beginnenden Stauchvorgang gelangen die Werkzeughälften 5, 6 miteinander sowie mit ihrer jeweils zugeordneten Werkzeuggrundplatte 9, 10 in Kontakt, so dass durch die fortlaufende Verdrängung und damit einhergehenden Druckerhöhung des sich im Hohlraum 13 des Werkstückes 3 befindlichen Druckmediums 11 der Umformvorgang zur Realisierung der Endform des Werkstückes 3 abgeschlossen wird, indem sich das Werkstück 3 zur Erzeugung der Ausbuchtungen 2 an die Gravur/Negativform 7 des Umformwerkzeuges anlegt (Fig. 3). Dabei entweicht das zwischen Werkstück 3 und Gravur/ Negativform 7 vorhandene Druckmedium über die sich in der Teilungsebene beider Werkzeughälften 5, 6 befindlichen Verdrängungskanäle 18. Nach dem Öffnen der Werkzeughälften 5, 6 kann das umgeformte, Ausbuchtungen 2 aufweisende Werkstück 3 entnommen werden. Es versteht sich von selbst, dass die Vorrichtung 1 auch für die Aufnahme einer Vielzahl von Werkstücken 3 ausgelegt werden kann, die dann auch gemeinsam die vorstehend geschilderte Umformung gleichzeitig erfahren.
The mode of operation of the method according to the invention and of the device operating thereafter will be explained below:
  • According to Fig. 1 is the reshaped, hollow profile and exemplified as a pipe workpiece 3, z. B. by means of appropriate handling technology, in the open device 1 under position-specific recording by the lower punch 14 inserted into the lower mold half 5, said tool half 5 is already in the container used with the pressure medium 11 as incompressible liquid (water) filled container 12 so that at least the workpiece 3 is completely filled with the liquid and surrounded. A sealing of the ends of the workpiece 3 is effected by the subsequent movement of the tool halves 5, 6. In this case, an axial compressive force is applied to the workpiece 3 by a press, so that over the sealingly engaging at the workpiece ends in the cavity 13 and at the bottom and Upper tool base plate 9, 10 provided lower and upper punch 14, 15, the displacement of the pressure medium 11 is used. Thus, at this time due to excessive internal pressure in the cavity 13 buckling of the workpiece 3 can be prevented, takes place via the provided in the punch 14 channel 16 in conjunction with the overpressure valve pressure equalization. In this phase of the process, the tool halves 5, 6 are held by the distance springs 8 at a distance to the lower and upper tool base plate 9, 10 ( Fig. 2 ). As a result of the further pressing force applied against the spacer springs 8 and the upsetting process beginning therewith, the tool halves 5, 6 come into contact with each other and with their associated tool base plate 9, 10, so that the continuous displacement and concomitant pressure increase in the cavity 13 of the workpiece 3 of the forming process for realizing the final shape of the workpiece 3 is completed by the workpiece 3 for generating the bulges 2 to the engraving / negative mold 7 of the forming tool applies ( Fig. 3 ). In the process, the pressure medium present between the workpiece 3 and the engraving / negative mold 7 escapes via the displacement channels 18 located in the dividing plane of the two tool halves 5, 6. After opening the tool halves 5, 6, the deformed workpiece 2 having protrusions 2 can be removed. It goes without saying that the device 1 can also be designed for receiving a plurality of workpieces 3, which then also experience together the above-described deformation simultaneously.

Aufstellung der verwendeten BezugszeichenList of used reference numbers

11
Vorrichtungcontraption
22
Ausbuchtungenbulges
33
Werkstückworkpiece
44
Längsachselongitudinal axis
55
untere Werkzeughälftelower mold half
66
obere Werkzeughälfteupper mold half
77
Gravur/NegativformEngraving / negative shape
88th
Distanzfederspacer spring
99
untere Werkzeuggrundplattelower tool base plate
1010
obere Werkzeuggrundplatteupper tool base plate
1111
Druckmediumprint media
1212
Behältercontainer
1313
Hohlraumcavity
1414
unterer Stempellower stamp
1515
oberer Stempelupper stamp
1616
Kanalchannel
1717
Zu- und AblaufInlet and outlet
1818
Verdrängungskanaldelivery channel

Claims (7)

  1. A method for creating a workpiece (3) with convexity using a pressure medium (11) in which the hollow-profile workpiece to be shaped is placed in a positionally-defined manner into a forming tool consisting of two mold halves (5, 6) split in transverse direction to the longitudinal axis of the workpiece and comprising an engraving/negative shape corresponding to the later end shape of said workpiece (3), the two mold halves (5, 6) seal the ends of the workpiece (3) off after being moved together, and an axial compressive force is applied to the workpiece (3), and through increasing the pressure of a pressure medium (11), an incompressible liquid located in the hollow space of the workpiece (3), the workpiece (3) moves against the engraving/negative shape of the forming tool to take on its end shape,
    characterized in that
    the workpiece (3) is inserted into one mold half (5) of the forming tool, said mold half (5) already being located in a container (12) filled with the incompressible liquid to be used as pressure medium (11) so that at least the workpiece is fully filled with, and encompassed by, the liquid; subsequently, the two mold halves (5, 6) move together, and displacement of the pressure medium (11) begins via the punches (14, 15) provided at an upper and lower mold base plate (9, 10) and engaging in, and sealing, the hollow space (13) at the ends of the workpiece (3), said mold halves (5, 6) being held at a spacing from the upper and lower mold base plates (9, 10) by spacer springs (8), and in that the mold halves (5, 6) get into contact by another compressive force applied to said spacer springs (8) so that the forming process to form the end shape of the workpiece (3) is completed by further displacement of the pressure medium (11).
  2. The method according to Claim 2,
    characterized in that
    water is used as the liquid and almost incompressible pressure medium (11).
  3. A device for creating a workpiece with convexity using a pressure medium, consisting of two mold halves (5, 6) split in transverse direction to the longitudinal axis (4) of the workpiece (3) and comprising an engraving/negative shape (7) corresponding to the later end shape of said workpiece (3),
    characterized in that
    spacer springs (8) are assigned to the mold halves (5, 6) via which these are connected to a lower and upper mold base plate (9, 10), whereby a container (12) is assigned to the lower mold base plate (9) and is filled with an incompressible liquid used as a pressure medium (11) into which at least the workpiece (3) immerses completely, and in that the lower and upper mold base plate (9, 10) each comprise a punch (14, 15) for engaging into the hollow space (13) of the workpiece (3).
  4. The device according to Claim 3,
    characterized in that
    a duct (16) for a pressure relief valve is provided in the lower mold base plate (9) and its punch (14).
  5. The device according to Claim 3,
    characterized in that
    the lower mold base plate (9) or the container (12) comprises an inlet and outlet (14) for the incompressible liquid used as a pressure medium (11).
  6. The device according to Claim 3,
    characterized in that
    at least one of the mold halves (5, 6) includes a displacement duct (18) for the pressure medium (11).
  7. The device according to Claim 6,
    characterized in that
    said displacement duct (18) is provided in the mold joint plane between the two mold halves (5, 6).
EP08016051A 2007-09-12 2008-09-11 Device and method for creating a workpiece with convexity using a pressure medium Active EP2036628B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007043316A DE102007043316B4 (en) 2007-09-12 2007-09-12 Method and device for producing a bulge-containing workpiece by means of a pressure medium

Publications (2)

Publication Number Publication Date
EP2036628A1 EP2036628A1 (en) 2009-03-18
EP2036628B1 true EP2036628B1 (en) 2010-05-05

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Application Number Title Priority Date Filing Date
EP08016051A Active EP2036628B1 (en) 2007-09-12 2008-09-11 Device and method for creating a workpiece with convexity using a pressure medium

Country Status (4)

Country Link
EP (1) EP2036628B1 (en)
AT (1) ATE466675T1 (en)
DE (2) DE102007043316B4 (en)
ES (1) ES2345853T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009030089B3 (en) * 2009-06-22 2010-11-11 Benteler Automobiltechnik Gmbh Process for hydroforming
DE102011052888A1 (en) * 2011-08-22 2013-02-28 Benteler Automobiltechnik Gmbh Method for forming hollow profile in molded components for motor vehicle, involves inserting hollow profile into mold cavity of two-part forming tool, and shaping hollow profile by closing process of forming tool in section-wise manner
CN102423784A (en) * 2011-11-08 2012-04-25 哈尔滨工程大学 Device and method for expanding diameter of shape memory alloy pipe joint based on elastic medium

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3625040A (en) * 1969-08-06 1971-12-07 Koppy Tool Corp Method and apparatus for forming articles from a tubular blank
DE4017072A1 (en) * 1990-05-26 1991-11-28 Benteler Werke Ag METHOD FOR HYDRAULIC FORMING A TUBULAR HOLLOW BODY AND DEVICE FOR CARRYING OUT THE METHOD
DE4337517A1 (en) * 1993-11-03 1995-05-04 Klaas Friedrich Process for the hydroforming of hollow stepped shafts made of cold-formable metal
US6128936A (en) * 1998-09-09 2000-10-10 Kabushiki Kaisha Opton Bulging device and bulging method
TWI267410B (en) * 2002-11-08 2006-12-01 Mitsubishi Motors Corp Deformed element pipe for hydraulic bulging, hydraulic bulging device using the element pipe, hydraulic bulging method using the element pipe, and hydraulic-bulged product
DE10357341B4 (en) * 2003-12-09 2006-02-09 Daimlerchrysler Ag Apparatus and method for hydroforming a blank
DE102005036419B4 (en) * 2005-07-29 2015-05-21 Tower Automotive Hydroforming Gmbh & Co. Kg Device for producing bulged hollow profiles, in particular gas generator housings for airbag devices

Also Published As

Publication number Publication date
ES2345853T3 (en) 2010-10-04
DE502008000612D1 (en) 2010-06-17
DE102007043316B4 (en) 2009-08-20
DE102007043316A1 (en) 2009-03-19
ATE466675T1 (en) 2010-05-15
EP2036628A1 (en) 2009-03-18

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