EP2221125B1 - Hydroforming tool - Google Patents

Hydroforming tool Download PDF

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Publication number
EP2221125B1
EP2221125B1 EP09002391A EP09002391A EP2221125B1 EP 2221125 B1 EP2221125 B1 EP 2221125B1 EP 09002391 A EP09002391 A EP 09002391A EP 09002391 A EP09002391 A EP 09002391A EP 2221125 B1 EP2221125 B1 EP 2221125B1
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EP
European Patent Office
Prior art keywords
tool
plate
compensation
compensation plate
pressure
Prior art date
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Application number
EP09002391A
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German (de)
French (fr)
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EP2221125A1 (en
Inventor
Dieter Kapp
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.)
Theodor Graebener GmbH and Co KG
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Theodor Graebener GmbH and Co KG
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Application filed by Theodor Graebener GmbH and Co KG filed Critical Theodor Graebener GmbH and Co KG
Priority to EP09002391A priority Critical patent/EP2221125B1/en
Priority to ES09002391T priority patent/ES2374020T3/en
Priority to AT09002391T priority patent/ATE526096T1/en
Publication of EP2221125A1 publication Critical patent/EP2221125A1/en
Application granted granted Critical
Publication of EP2221125B1 publication Critical patent/EP2221125B1/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
    • 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
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/007—Means for maintaining the press table, the press platen or the press ram against tilting or deflection

Definitions

  • the invention relates to a tool for high-pressure forming of plate-shaped metallic workpieces, comprising a tool upper part with a forming die and a tool lower part with a supply line for subjecting a workpiece with fluid under high pressure, according to the preamble of claim 1 (see, for example EP-A-1 813 363 ).
  • forming tools are used to receive a workpiece blank and then bring this by appropriate force into the desired shape.
  • the process of high pressure forming (English: Hydroforming) has established itself, which is characterized by great design freedom in the design and very high degrees of deformation allows.
  • the semi-finished product is pressed within a hydroforming tool via a fluid, in particular water, oils, emulsions or even gases, with very high pressure against a forming die, whereby the Deformation is achieved.
  • the tool is introduced in a housing, which receives the forming forces.
  • Hydroforming tools usually consist of a tool upper part, which comprises the forming die, and a tool lower part, in which a line for pressurizing the workpiece with fluid under high pressure is arranged.
  • the forming die can also be arranged in the tool lower part and the line for acting on the workpiece with fluid can alternatively also be arranged in the upper die part.
  • the workpiece for example a metal sheet, is clamped between the upper part of the tool and the lower part of the tool, with the lower part of the tool resting against the workpiece via a seal. Subsequently, the pressurization of the workpiece with the fluid under high pressure, whereby the workpiece is pressed evenly against the die.
  • the invention aims to remedy this situation.
  • the present invention has for its object to provide a tool for high-pressure forming of metallic workpieces, in which a deformation of the forming die is prevented during the forming process. According to the invention, this object is solved by the features of the characterizing part of patent claim 1.
  • a tool for high-pressure forming of metallic workpieces in which a deformation of the forming die is prevented during the forming process.
  • the means for compensation in the forming die are integrated and arranged within the upper die, wherein the forming die (26) controlled against the process pressure-induced deflection of the same bendable.
  • the compensation plate can be acted upon by a hydraulic line with fluid pressure such that the desired bending of the compensation plate can be achieved.
  • a well controllable bending of the compensation plate is made possible.
  • the compensation plate has a recess for generating a hydraulic pressure pad.
  • a uniform bending of the compensation plate can be achieved.
  • the compensation plate is flat connected to a spacer plate in which the hydraulic line is introduced, which opens into the recess of the compensation plate.
  • the tool lower part comprises a second compensation plate for compensation of process pressure-induced bends of the workpiece to be formed.
  • the second compensation plate is mounted on a spacer plate and serves the support of the workpiece.
  • the second compensation plate on its side facing away from the spacer plate on a recess in which a running within the compensation plate hydraulic line opens.
  • the second compensation plate on its side facing the spacer plate on a recess in which a running within the spacer plate hydraulic line opens.
  • the second compensation plate on its side facing the spacer plate on a recess into which a running within the compensation plate hydraulic line opens.
  • the oppositely arranged spacer plates of the hydroforming die are identically formed. This reduces tooling and maintenance costs.
  • the selected as an exemplary embodiment tool for high-pressure forming of metallic workpieces (hydroforming tool) 1 consists essentially of a tool upper part 2 and a tool lower part 3.
  • the upper tool part 2 comprises an upper spacer plate 21 to which a compensation plate 22 is mounted for deflection compensation.
  • the compensation plate 22 has on its side facing the spacer plate 21 centered a two-dimensional recess 23 which is sealed by a seal 24 against the spacer plate 21 and in which a disposed within the spacer plate 21 hydraulic line 25 opens.
  • the seal 24 and the recess 23 may each be arranged in the spacer plate 21.
  • On its underside facing away from the spacer plate 21 a forming die 26 is arranged on the compensation plate 22, which has the diffformende in the workpiece 4 contour. Compensation plate 22 and forming die 26 may also be made in one piece.
  • the tool lower part 3 comprises a lower spacer plate 31, to which a compensation plate 32 for deflection compensation is attached.
  • the lower spacer plate 31 is identical to the upper spacer plate 21 is formed.
  • the compensation plate 32 has on its side facing the spacer plate 31 centered on a flat recess 33 which is sealed by a seal 34 against the spacer plate 31 and in which a disposed within the spacer plate 31 hydraulic line 35 opens.
  • the seal 34 and the recess 33 may each be arranged in the spacer plate 31.
  • a vertically formed hydraulic line 36 is arranged in the compensation plate 32, which opens into a second recess 37 of the compensation plate 32 arranged opposite the recess 33 on its opposite side.
  • the second, the work shell 2 facing recess 37th is sealed by a seal 38 during the forming process relative to the resting workpiece 4 to be machined.
  • the recesses 23, 33, 37 are formed only very flat and are used for the areal distribution of the fluid supplied via the hydraulic lines 25, 35, 36, whereby a pressure pad is formed.
  • the workpiece 4 is acted upon by lines 35, 36 under high pressure with fluid and pressed against the contour of the Umformmatrize 26
  • the compensation plate 32 via the seal 38 against the Workpiece 4 sealed.
  • Possible deflections of the forming die 26 caused by the applied forming pressure can be compensated for by applying a fluid under pressure to the compensation plate 22 via the line 25, whereby a deflection in the opposite direction is effected.
  • a compensating counterbending is also effected via the flat depression 33.
  • the hydraulic supply line 35 is also arranged within the compensation plate 32. In the lower spacer plate 31 no hydraulic line is required here.
  • the line 36 is formed within the compensation plate 32 such that it is separated from the arranged within the spacer plate 31 hydraulic line 35 and can be fed via a separate fluid supply.
  • the compensation plate 32 can be pressurized via the line 35 by means of a fluid and thus a directed toward the tool upper part 2, defined deflection can be achieved for compensation.
  • FIG. 5 an exemplary installation situation of a hydroforming tool according to the invention is shown.
  • the hydroforming tool 1 is in a housing 5, which is essentially formed of an upper cross member 51 and a lower cross member 52, which are connected by tie rods 53 together.
  • a hydraulic cylinder 54 is arranged, on which the upper tool part 2 is arranged.
  • the lower tool part is mounted opposite to a hydraulic cylinder 55 which is connected to the lower cross member 52.
  • the upper part 2 and lower part 3 of the tool are pressed together on both sides of an inserted workpiece 4 via the hydraulic cylinders 54, 55.
  • the forming process then takes place within the tool 1.

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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 tool (1) has an upper part (2) with a shaping die (26) and a lower part with a supply line for applying a workpiece with a fluid under high pressure. A compensation unit is arranged in the upper part for compensating a process pressure indexed deflection. The compensation unit comprises a compensation plate (22) that has a recess (23) for generating a hydraulic pressure pad. The compensation plate is connected with a distance plate (21) and a hydraulic line (25) is attached in the distance plate.

Description

Die Erfindung betrifft ein Werkzeug zur Hochdruckumformung von plattenförmigen metallischen Werkstücken, umfassend ein Werkzeugoberteil mit einer Umformmatrize und ein Werkzeugunterteil mit einer Zuleitung zur Beaufschlagung eines Werkstücks mit Fluid unter hohem Druck, gemäß dem Oberbegriff des Anspruchs 1 (siehe z.B. EP-A-1 813 363 ).The invention relates to a tool for high-pressure forming of plate-shaped metallic workpieces, comprising a tool upper part with a forming die and a tool lower part with a supply line for subjecting a workpiece with fluid under high pressure, according to the preamble of claim 1 (see, for example EP-A-1 813 363 ).

Zur Herstellung von Werkstücken durch einen spanlosen Umformprozess werden üblicherweise Pressen verwendet, in denen Umformwerkzeuge eingesetzt sind, um einen Werkstückrohling aufzunehmen und diesen dann durch entsprechende Krafteinwirkung in die gewünschte Form zu bringen. Insbesondere im Bereich der Umformung von plattenförmigen Halbzeugen, wie beispielsweise Blechen, aber auch zur Umformung anderer Halbzeuge, wie beispielsweise Rohren, hat sich das Verfahren der Hochdruckumformung (engl. Hydroforming) etabliert, welches sich durch große Gestaltungsfreiheit bei der Formgebung auszeichnet und sehr hohe Umformgrade ermöglicht. Dabei wird das Halbzeug innerhalb eines Hydroformwerkzeugs über ein Fluid, insbesondere Wasser, Öle, Emulsionen oder auch Gase, mit sehr hohem Druck gegen eine Umformmatrize gepresst, wodurch die Verformung erzielt wird. Das Werkzeug ist dabei in einem Gehäuse eingebracht, welches die Umformkräfte aufnimmt.For the production of workpieces by a chipless forming process usually presses are used in which forming tools are used to receive a workpiece blank and then bring this by appropriate force into the desired shape. In particular, in the field of forming plate-shaped semi-finished products, such as sheets, but also for forming other semi-finished products, such as pipes, the process of high pressure forming (English: Hydroforming) has established itself, which is characterized by great design freedom in the design and very high degrees of deformation allows. The semi-finished product is pressed within a hydroforming tool via a fluid, in particular water, oils, emulsions or even gases, with very high pressure against a forming die, whereby the Deformation is achieved. The tool is introduced in a housing, which receives the forming forces.

Hydroformwerkzeuge bestehen üblicherweise aus einem Werkzeugoberteil, welches die Umformmatrize umfasst, und einem Werkzeugunterteil, in dem eine Leitung zur Beaufschlagung des Werkstücks mit Fluid unter hohem Druck angeordnet ist. Die Umformmatrize kann alternativ auch im Werkzeugunterteil und die Leitung zur Beaufschlagung des Werkstücks mit Fluid kann alternativ auch im Werkzeugoberteil angeordnet sein. Zur Umformung wird das Werkstück, beispielsweise ein Metallblech, zwischen Werkzeugoberteil und Werkzeugunterteil eingespannt, wobei das Werkzeugunterteil über eine Dichtung an dem Werkstück anliegt. Nachfolgend erfolgt die Beaufschlagung des Werkstücks mit dem Fluid unter hohem Druck, wodurch das Werkstück gleichmäßig an die Matrize angepresst wird.Hydroforming tools usually consist of a tool upper part, which comprises the forming die, and a tool lower part, in which a line for pressurizing the workpiece with fluid under high pressure is arranged. Alternatively, the forming die can also be arranged in the tool lower part and the line for acting on the workpiece with fluid can alternatively also be arranged in the upper die part. For forming, the workpiece, for example a metal sheet, is clamped between the upper part of the tool and the lower part of the tool, with the lower part of the tool resting against the workpiece via a seal. Subsequently, the pressurization of the workpiece with the fluid under high pressure, whereby the workpiece is pressed evenly against the die.

Bedingt durch den sehr hohen Druck, mit dem das Fluid auf das Werkstück gegen die Matrize gepresst wird, ergeben sich oftmals Verformungen des Werkzeugober- und Unterteils, wodurch der Umformvorgang beeinträchtigt werden kann.Due to the very high pressure with which the fluid is pressed onto the workpiece against the die, often deformations of the tool top and bottom parts, whereby the forming process can be impaired.

Hier will die Erfindung Abhilfe schaffen. Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Werkzeug zur Hochdruckumformung von metallischen Werkstücken zu schaffen, bei dem eine Verformung der Umformmatrize während des Umformprozesses verhindert ist. Gemäß der Erfindung wird diese Aufgabe durch die Merkmale des kennzeichnenden Teils des Patentanspruchs 1 gelöst.The invention aims to remedy this situation. The present invention has for its object to provide a tool for high-pressure forming of metallic workpieces, in which a deformation of the forming die is prevented during the forming process. According to the invention, this object is solved by the features of the characterizing part of patent claim 1.

Mit der Erfindung ist ein Werkzeug zur Hochdruckumformung von metallischen Werkstücken geschaffen, bei dem eine Verformung der Umformmatrize während des Umformprozesses verhindert ist.With the invention, a tool for high-pressure forming of metallic workpieces is provided, in which a deformation of the forming die is prevented during the forming process.

In Weiterbildung der Erfindung sind die Mittel zur Kompensation in der Umformmatrize integriert und innerhalb des Werkzeugoberteils angeordnet, wobei die Umformmatrize (26) gesteuert entgegen der prozessdruckindizierten Durchbiegung derselben biegbar ist. Hierdurch ist eine definierte Biegung der Umformmatrize entgegengesetzt der prozessdruckindizierten Biegung erzielbar, wodurch die Kompensation der prozessdruckindizierten Biegung bewirkt ist.In a further development of the invention, the means for compensation in the forming die are integrated and arranged within the upper die, wherein the forming die (26) controlled against the process pressure-induced deflection of the same bendable. As a result, a defined bending of the forming die opposite to the process pressure-indicated bending achievable, whereby the compensation of the process pressure-induced bending is effected.

Gemäß der Erfindung ist die Kompensationsplatte über eine Hydraulikleitung derart mit Fluiddruck beaufschlagbar, dass die gewünschte Biegung der Kompensationsplatte erzielbar ist. Hierdurch ist eine gut steuerbare Biegung der Kompensationsplatte ermöglicht.According to the invention, the compensation plate can be acted upon by a hydraulic line with fluid pressure such that the desired bending of the compensation plate can be achieved. As a result, a well controllable bending of the compensation plate is made possible.

Gemäß der Erfindung weist die Kompensationsplatte eine Vertiefung zur Erzeugung eines hydraulischen Druckkissens auf. Hierdurch ist eine gleichmäßige Biegung der Kompensationsplatte erzielbar. Bevorzugt ist die Kompensationsplatte flächig mit einer Distanzplatte verbunden, in der die Hydraulikleitung eingebracht ist, welche in der Vertiefung der Kompensationsplatte mündet.According to the invention, the compensation plate has a recess for generating a hydraulic pressure pad. As a result, a uniform bending of the compensation plate can be achieved. Preferably, the compensation plate is flat connected to a spacer plate in which the hydraulic line is introduced, which opens into the recess of the compensation plate.

In Weiterbildung der Erfindung umfasst das Werkzeugunterteil eine zweite Kompensationsplatte zur Kompensation von prozessdruckindizierten Biegungen des umzuformenden Werkstücks. Hierdurch sind Beeinträchtigungen des Umformprozesses durch prozessdruckindizierte Verbiegungen des Werkzeugunterteils vermieden. Bevorzugt ist die zweite Kompensationsplatte auf einer Distanzplatte befestigt und dient der Auflage des Werkstücks.In a further development of the invention, the tool lower part comprises a second compensation plate for compensation of process pressure-induced bends of the workpiece to be formed. As a result, impairments of the forming process are avoided by process pressure-induced bending of the lower tool part. Preferably, the second compensation plate is mounted on a spacer plate and serves the support of the workpiece.

Vorteilhaft weist die zweite Kompensationsplatte auf ihrer der Distanzplatte abgewandten Seite eine Vertiefung auf, in der eine innerhalb der Kompensationsplatte verlaufende Hydraulikleitung mündet. Hierdurch ist die Bildung eines fluiden Druckkissens ermöglicht, wodurch ein über die Fläche gleichmäßiger Umformdruck erzielt ist.Advantageously, the second compensation plate on its side facing away from the spacer plate on a recess in which a running within the compensation plate hydraulic line opens. As a result, the formation of a fluid Pressure pad allows, which is achieved over the surface uniform forming pressure.

In Ausgestaltung der Erfindung weist die zweite Kompensationsplatte auf ihrer der Distanzplatte zugewandten Seite eine Vertiefung auf, in der eine innerhalb der Distanzplatte verlaufende Hydraulikleitung mündet. Hierdurch ist die Bildung eines fluiden Druckkissens ermöglicht, wodurch eine über die Fläche gleichmäßige Biegung der Kompensationsplatte ermöglicht ist.In an embodiment of the invention, the second compensation plate on its side facing the spacer plate on a recess in which a running within the spacer plate hydraulic line opens. As a result, the formation of a fluid pressure pad is made possible, whereby a uniform over the surface bending of the compensation plate is made possible.

In weiterer Ausgestaltung der Erfindung weist die zweite Kompensationsplatte auf ihrer der Distanzplatte zugewandten Seite eine Vertiefung auf, in die eine innerhalb der Kompensationsplatte verlaufende Hydraulikleitung mündet. Hierdurch ist die Fluidversorgung der Vertiefung zur Bildung des fluiden Druckkissens über die Kompensationsplatte ermöglicht. Eine diesbezügliche Leitung in der Distanzplatte ist nicht erforderlich.In a further embodiment of the invention, the second compensation plate on its side facing the spacer plate on a recess into which a running within the compensation plate hydraulic line opens. As a result, the fluid supply to the recess for forming the fluid pressure pad on the compensation plate is made possible. A related line in the spacer plate is not required.

Vorteilhaft sind die gegenüberliegend angeordneten Distanzplatten des Hydroformwerkzeugs identisch ausgebildet. Hierdurch sind Werkzeugproduktions- und Haltungskosten vermindert.Advantageously, the oppositely arranged spacer plates of the hydroforming die are identically formed. This reduces tooling and maintenance costs.

Andere Weiterbildungen und Ausgestaltungen der Erfindung sind in den übrigen Unteransprüchen angegeben. Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird nachfolgend im Einzelnen beschrieben. Es Zeigen:

Figur 1
die schematische Darstellung eines Hydroform-Werkzeugs mit Kompensationsplatte im Schnitt;
Figur 2
die schematische Darstellung eines Hydroform-Werkzeugs in einer weiteren Ausführungsform im Schnitt;
Figur 3
die schematische Darstellung eines Hydroform-Werkzeugs in einer dritten Ausführungsform im Schnitt;
Figur 4
die dreidimensionale Schnittdarstellung des Werkzeugs aus Figur 2 mit umgeformten Blech und
Figur 5
die dreidimensionale Darstellung eines Hydroform-Werkzeugs in einer Vorrichtung zur Herstellung von Formteilen.
Other developments and refinements of the invention are specified in the remaining subclaims. An embodiment of the invention is illustrated in the drawings and will be described in detail below. Show it:
FIG. 1
the schematic representation of a hydroforming tool with compensation plate in section;
FIG. 2
the schematic representation of a hydroforming tool in another embodiment in section;
FIG. 3
the schematic representation of a hydroforming tool in a third embodiment in section;
FIG. 4
the three-dimensional sectional view of the tool FIG. 2 with formed sheet metal and
FIG. 5
the three-dimensional representation of a hydroforming tool in a device for the production of moldings.

Das als Ausführungsbeispiel gewählte Werkzeug zur Hochdruckumformung von metallischen Werkstücken (Hydroform-Werkzeug) 1 besteht im Wesentlichen aus einem Werkzeugoberteil 2 und einem Werkzeugunterteil 3. Das Werkzeugoberteil 2 umfasst eine obere Distanzplatte 21, an der eine Kompensationsplatte 22 zur Durchbiegungskompensation angebracht ist. Die Kompensationsplatte 22 weist auf ihrer der Distanzplatte 21 zugewandten Seite mittig eine flächige Vertiefung 23 auf, die über eine Dichtung 24 gegenüber der Distanzplatte 21 abgedichtet ist und in der eine innerhalb der Distanzplatte 21 angeordnete Hydraulikleitung 25 mündet. Die Dichtung 24 sowie die Vertiefung 23 können jeweils auch in der Distanzplatte 21 angeordnet sein. An ihrer der Distanzplatte 21 abgewandten Unterseite ist an der Kompensationsplatte 22 eine Umformmatrize 26 angeordnet, welche die in das Werkstück 4 einzuformende Kontur aufweist. Kompensationsplatte 22 und Umformmatrize 26 können auch einstückig ausgeführt sein.The selected as an exemplary embodiment tool for high-pressure forming of metallic workpieces (hydroforming tool) 1 consists essentially of a tool upper part 2 and a tool lower part 3. The upper tool part 2 comprises an upper spacer plate 21 to which a compensation plate 22 is mounted for deflection compensation. The compensation plate 22 has on its side facing the spacer plate 21 centered a two-dimensional recess 23 which is sealed by a seal 24 against the spacer plate 21 and in which a disposed within the spacer plate 21 hydraulic line 25 opens. The seal 24 and the recess 23 may each be arranged in the spacer plate 21. On its underside facing away from the spacer plate 21 a forming die 26 is arranged on the compensation plate 22, which has the einzuformende in the workpiece 4 contour. Compensation plate 22 and forming die 26 may also be made in one piece.

Das Werkzeugunterteil 3 umfasst eine untere Distanzplatte 31, an der eine Kompensationsplatte 32 zur Durchbiegungskompensation angebracht ist. Im Ausführungsbeispiel gemäß Figur 1 ist die untere Distanzplatte 31 identisch zur oberen Distanzplatte 21 ausgebildet. Die Kompensationsplatte 32 weist an ihrer der Distanzplatte 31 zugewandten Seite mittig eine flächige Vertiefung 33 auf, die über eine Dichtung 34 gegenüber der Distanzplatte 31 abgedichtet ist und in der eine innerhalb der Distanzplatte 31 angeordnete Hydraulikleitung 35 mündet. Die Dichtung 34 sowie die Vertiefung 33 können jeweils auch in der Distanzplatte 31 angeordnet sein. Mittig der Vertiefung 33 ist in die Kompensationsplatte 32 eine senkrecht ausgebildete Hydraulikleitung 36 angeordnet, die in einer auf ihrer der Vertiefung 33 gegenüberliegend angeordneten zweiten Vertiefung 37 der Kompensationsplatte 32 mündet. Die zweite, dem Werkoberteil 2 zugewandte Vertiefung 37 ist über eine Dichtung 38 beim Umformprozess gegenüber dem aufliegenden zu bearbeitenden Werkstück 4 abgedichtet.The tool lower part 3 comprises a lower spacer plate 31, to which a compensation plate 32 for deflection compensation is attached. In the embodiment according to FIG. 1 the lower spacer plate 31 is identical to the upper spacer plate 21 is formed. The compensation plate 32 has on its side facing the spacer plate 31 centered on a flat recess 33 which is sealed by a seal 34 against the spacer plate 31 and in which a disposed within the spacer plate 31 hydraulic line 35 opens. The seal 34 and the recess 33 may each be arranged in the spacer plate 31. In the middle of the recess 33, a vertically formed hydraulic line 36 is arranged in the compensation plate 32, which opens into a second recess 37 of the compensation plate 32 arranged opposite the recess 33 on its opposite side. The second, the work shell 2 facing recess 37th is sealed by a seal 38 during the forming process relative to the resting workpiece 4 to be machined.

Die Vertiefungen 23, 33, 37 sind lediglich sehr flach ausgebildet und dienen der flächigen Verteilung des über die Hydraulikleitungen 25, 35, 36 zugeführten Fluids, wodurch ein Druckkissen gebildet ist. Bei der Umformung eines zwischen dem Werkzeugoberteil 2 und dem Werkzeugunterteil 3 eingebrachten Werkstücks 4 wird das Werkstück 4 über die Leitungen 35, 36 unter hohem Druck mit Fluid beaufschlagt und an die Kontur der Umformmatrize 26 angepresst Dabei ist die Kompensationsplatte 32 über die Dichtung 38 gegenüber dem Werkstück 4 abgedichtet. Mögliche durch den anliegenden Umformdruck bewirkte Durchbiegungen der Umformmatrize 26 können kompensiert werden, indem über die Leitung 25 die Kompensationsplatte 22 unter Druck mit einem Fluid beaufschlagt wird, wodurch eine Durchbiegung in entgegengesetzter Richtung bewirkt ist. Auf die untere Kompensationsplatte 32 wird über die flächige Vertiefung 33 ebenfalls eine kompensierende Gegenbiegung bewirkt.The recesses 23, 33, 37 are formed only very flat and are used for the areal distribution of the fluid supplied via the hydraulic lines 25, 35, 36, whereby a pressure pad is formed. When forming a introduced between the upper die 2 and the lower tool part 3 workpiece 4, the workpiece 4 is acted upon by lines 35, 36 under high pressure with fluid and pressed against the contour of the Umformmatrize 26 Here is the compensation plate 32 via the seal 38 against the Workpiece 4 sealed. Possible deflections of the forming die 26 caused by the applied forming pressure can be compensated for by applying a fluid under pressure to the compensation plate 22 via the line 25, whereby a deflection in the opposite direction is effected. On the lower compensation plate 32, a compensating counterbending is also effected via the flat depression 33.

Im Ausführungsbeispiel nach Figur 3 ist die Hydraulikzuleitung 35 ebenfalls innerhalb der Kompensationsplatte 32 angeordnet. In der unteren Distanzplatte 31 ist hier keine Hydraulikleitung erforderlich.In the embodiment according to FIG. 3 the hydraulic supply line 35 is also arranged within the compensation plate 32. In the lower spacer plate 31 no hydraulic line is required here.

Im Ausführungsbeispiel gemäß Figur 2 ist die Leitung 36 innerhalb der Kompensationsplatte 32 derart ausgebildet, dass sie von der innerhalb der Distanzplatte 31 angeordneten Hydraulikleitung 35 getrennt ist und über eine separate Fluidzuführung gespeist werden kann. Dadurch kann unabhängig von dem zur Umformung innerhalb der Leitung 36 anliegenden Druck die Kompensationsplatte 32 über die Leitung 35 mittels eines Fluids mit Druck beaufschlagt werden und so eine in Richtung des Werkzeugoberteils 2 gerichtete, definierte Durchbiegung zur Kompensation erzielt werden.In the embodiment according to FIG. 2 the line 36 is formed within the compensation plate 32 such that it is separated from the arranged within the spacer plate 31 hydraulic line 35 and can be fed via a separate fluid supply. As a result, independent of the pressure applied for forming within the line 36, the compensation plate 32 can be pressurized via the line 35 by means of a fluid and thus a directed toward the tool upper part 2, defined deflection can be achieved for compensation.

In Figur 5 ist eine beispielhafte Einbausituation eines erfindungsgemäßen Hydroform-Werkzeugs gezeigt. Dabei ist das Hydroform-Werkzeug 1 in einem Gehäuse 5 angeordnet, das im Wesentlichen gebildet ist aus einer oberen Traverse 51 und einer unteren Traverse 52, die über Zuganker 53 miteinander verbunden sind. An der oberen Traverse 51 ist ein Hydraulikzylinder 54 angeordnet, an dem das Werkzeugoberteil 2 angeordnet ist. Das Werkzeugunterteil ist gegenüberliegend an einem Hydraulikzylinder 55 befestigt, der mit der unteren Traverse 52 verbunden ist. Vor dem Umformprozess werden Werkzeugoberteil 2 und Werkzeugunterteil 3 über die Hydraulikzylinder 54, 55 beidseitig eines eingelegten Werkstücks 4 zusammengepresst. Der Umformprozess erfolgt anschließend innerhalb des Werkzeugs 1.In FIG. 5 an exemplary installation situation of a hydroforming tool according to the invention is shown. In this case, the hydroforming tool 1 is in a housing 5, which is essentially formed of an upper cross member 51 and a lower cross member 52, which are connected by tie rods 53 together. At the upper cross member 51, a hydraulic cylinder 54 is arranged, on which the upper tool part 2 is arranged. The lower tool part is mounted opposite to a hydraulic cylinder 55 which is connected to the lower cross member 52. Before the forming process, the upper part 2 and lower part 3 of the tool are pressed together on both sides of an inserted workpiece 4 via the hydraulic cylinders 54, 55. The forming process then takes place within the tool 1.

Claims (9)

  1. Tool for high-pressure forming of plate-shaped metal workpieces, comprising a tool upper part (2) with a forming die (26) and a tool lower part (3) with a feed line for applying pressure to a workpiece by means of a fluid under high pressure, where means for compensating for process-pressure-induced bending are disposed, characterised in that the means for compensation comprise a compensation plate (22) on which the forming die (26) is disposed inside the tool upper part (2) and which can be bent under control against the process-pressure induced direction of bend of the forming die (26), where fluid pressure can be applied to the compensation plate (22) via a hydraulic line (25) so that the compensation plate (22) can be bent and where the compensation plate (22) incorporates on its upper side facing away from the forming die (26) a recess (23) for generating a hydraulic pressure cushion.
  2. Tool in accordance with claim 1, characterised in that the means for compensation are integrated into the forming die (26) and are disposed inside the tool upper part (2), where the forming die (26) can be bent under control against its process-pressure induced bending.
  3. Tool in accordance with claim 1 or 2, characterised in that the compensation plate (22) is connected by its surface to a spacer plate (21) in which the hydraulic line (25) which runs into the recess (23) in the compensation plate (22) is incorporated.
  4. Tool in accordance with any one of the aforementioned claims, characterised in that the tool lower part (3) incorporates a second compensation plate (32) for compensating for process-pressure-induced bending of the workpiece (4) to be formed.
  5. Tool in accordance with claim 4, characterised in that the second compensation plate (32) is fastened to a spacer plate (31) and serves to support the workpiece (4).
  6. Tool in accordance with claim 5, characterised in that the second compensation plate (32) incorporates on its side facing away from the spacer plate (31) a recess (37) into which a hydraulic line (36) running inside the compensation plate (32) runs.
  7. Tool in accordance with claim 5 or 6, characterised in that the second compensation plate (32) incorporates on its side facing the spacer plate (31) a recess (33) into which a hydraulic line (36) running inside the spacer plate (31) runs.
  8. Tool in accordance with claim 6, characterised in that the second compensation plate (32) incorporates on its side facing the spacer plate (31) a recess (33) into which a hydraulic line (36) running inside the compensation plate (32) opens.
  9. Tool in accordance with any one of the aforementioned claims, characterised in that the opposing spacer plates (21, 31) of the hydroforming tool (1) are constructed identically.
EP09002391A 2009-02-20 2009-02-20 Hydroforming tool Active EP2221125B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP09002391A EP2221125B1 (en) 2009-02-20 2009-02-20 Hydroforming tool
ES09002391T ES2374020T3 (en) 2009-02-20 2009-02-20 HYDROFORMATION TOOL.
AT09002391T ATE526096T1 (en) 2009-02-20 2009-02-20 HYDROFORMING TOOL

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09002391A EP2221125B1 (en) 2009-02-20 2009-02-20 Hydroforming tool

Publications (2)

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EP2221125A1 EP2221125A1 (en) 2010-08-25
EP2221125B1 true EP2221125B1 (en) 2011-09-28

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EP09002391A Active EP2221125B1 (en) 2009-02-20 2009-02-20 Hydroforming tool

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EP (1) EP2221125B1 (en)
AT (1) ATE526096T1 (en)
ES (1) ES2374020T3 (en)

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
CN114523023A (en) * 2022-02-15 2022-05-24 河北光兴半导体技术有限公司 Stamping system and stamping forming method for fuel cell unipolar plate

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19705244A1 (en) * 1997-02-12 1998-08-13 Huber & Bauer Gmbh Forming device
US7509827B2 (en) * 2002-05-08 2009-03-31 Avure Technologies Ab Device and method for expansion forming
DE102006003981B4 (en) * 2006-01-27 2010-12-09 Theodor Gräbener GmbH & Co. KG Hydroforming press for the production of molded parts by hydroforming

Also Published As

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ES2374020T9 (en) 2012-05-04
ATE526096T1 (en) 2011-10-15
ES2374020T3 (en) 2012-02-13
EP2221125A1 (en) 2010-08-25

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