EP1147833A2 - Method and apparatus for deep-drawing sheet-metal workpieces - Google Patents

Method and apparatus for deep-drawing sheet-metal workpieces Download PDF

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Publication number
EP1147833A2
EP1147833A2 EP01107980A EP01107980A EP1147833A2 EP 1147833 A2 EP1147833 A2 EP 1147833A2 EP 01107980 A EP01107980 A EP 01107980A EP 01107980 A EP01107980 A EP 01107980A EP 1147833 A2 EP1147833 A2 EP 1147833A2
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EP
European Patent Office
Prior art keywords
shaped
elements
contours
shaped elements
molded
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EP01107980A
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German (de)
French (fr)
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EP1147833A3 (en
Inventor
Ralf Dr. Kolleck
Bernd Dr. Engel
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Schuler SMG GmbH and Co KG
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Schuler SMG GmbH and Co KG
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Application filed by Schuler SMG GmbH and Co KG filed Critical Schuler SMG GmbH and Co KG
Publication of EP1147833A2 publication Critical patent/EP1147833A2/en
Publication of EP1147833A3 publication Critical patent/EP1147833A3/en
Withdrawn legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20Deep-drawing
    • B21D22/205Hydro-mechanical deep-drawing

Definitions

  • the invention relates to a method for deep drawing flat sheets to form parts arranged on the part bottom local shape contours with a small shape radius by the sheet metal clamped on the edge by means of a contour of the molded part against a fluid active medium is reshaped.
  • the invention further relates to a Device for performing the method.
  • Methods of the aforementioned type are also called hydromechanical Referred to as deep drawing.
  • active media have in oil emulsions. That from the hold-down sheet metal clamped against the lower tool becomes at the same time pressed against a seal and thereby the space below of the sheet sealed.
  • This space of the lower tool is then filled with the oil emulsion in which the necessary movement due to the movement of the stamp over the sheet Forming pressure builds up.
  • the sheet is molded onto the die. After reaching the final contour, the pressure in the lower tool dismantled and the molded part can be removed.
  • This deep-drawing process works with simple molded part contours inexpensive and compared to conventional deep-drawing technology with little tool wear with less Strain on sheet metal or molded part. Instructs the molding shape contours in its bottom, which is shaped against the active medium with tight radii, such as local depressions, beads, Cant or the like on the leading Face of the press ram formed as corresponding contours are required, especially towards the end of the forming process high pressures in the active medium and a corresponding high locking force to ensure pressure tightness.
  • the invention is based, the hydromechanical task To further develop thermoforming processes in such a way that Moldings with local shape contours with small shape radii with such a final pressure or hold-down force can be reshaped as for reshaping Moldings without such local shape contours are necessary.
  • Another object of the invention is to provide a Propose a suitable device to carry out the method.
  • the first task is a hydromechanical one Thermoforming process of the type mentioned at the outset, that the sheet in the area of the local shape contours against resiliently positioned in the active medium Solid-form elements is formed.
  • the method according to the invention largely uses the deformation work the advantages of the hydromechanical Deep drawing. Wherever this process has high media pressures and therefore requires a large locking force, namely when reshaping local shape contours with small shape radii the method according to the invention works with a kind of embossing process, in which these shape contours by molding resiliently shaped elements are formed.
  • the shaped elements in the Active medium positioned so that the sheet by the movement of the die at the end of the forming process in the area the local shape contours are shaped by means of the shape elements becomes.
  • molded elements are made from an elastically deformable Material used, the deformation work on the shaped elements for forming the sheet worries.
  • the elastically deformable material used should also be highly wear-resistant. Form elements are preferred made of a cast polyurethane resin.
  • the invention is based on a device with a a press frame guided die with the contour of the molded part bottom, a container-shaped lower tool with inlet and outlet for the active medium and one that Plate holding clamp on the edge.
  • a device with a a press frame guided die with the contour of the molded part bottom, a container-shaped lower tool with inlet and outlet for the active medium and one that Plate holding clamp on the edge.
  • the device is characterized in that in the lower tool with respect to the local shape contours small form radius on the press ram solid form elements are positioned that are resilient and flexible in one are arranged such that the ram with the Sheet metal towards the end of the forming process on the form elements accumulates.
  • the solid form elements are corresponding in the lower tool the arrangement of the local form contours on the form stamp positioned. They are arranged at such a height that they are towards the end of the forming movement of the die take effect by pressing the stamp against the sheet the form elements tarnish and give way elastically, however only to such an extent that the sheet metal on the local Shape contours is embossed. While the hydromechanical Deep drawing for such shape contours up to 1500 bar must be generated in the invention trained device the active media pressure remain limited to approx. 100 bar. That way you can large workpieces with small form radii Shaped devices with relatively low locking force become. Radii can also be molded in, not with conventional hydromechanical forming are more malleable.
  • the Form elements set in their relative position to the form stamp be what is preferably hydraulic Actuators happen.
  • the hydraulic Actuators may have a higher pressure than the active media pressure are applied.
  • the shaped elements preferably consist of an elastic deformable and wear-resistant material, whereby polyurethane casting resin has proven to be particularly advantageous Has.
  • the shaped elements do not need any on their active surface have a special shape, rather forms this by elastic change in shape when the die is started with the sheet against the form elements by itself out.
  • the shaped elements are preferably interchangeable in the lower tool arranged to replace them when worn can.
  • the lower tool supports according to the local shape contours positioned on the die and the elastic molded elements are interchangeably attached.
  • the supports can be rigid or as hydraulic actuators, e.g. as a hydraulic cylinder, be formed by means of which the shaped elements are deliverable to the form stamp.
  • the drawing shows only a schematic representation of the Connection with the invention essential components of a hydromechanical press. It has one as the upper tool Press die 1 on the in the guides, not shown Press frame is vertically raised and lowered and its in essential vertical peripheral surface 3 in connection with the leading end face 4 the inner contour of the to be manufactured Determined molding.
  • the press also instructs Lower tool 5, which is essentially container-shaped is formed and with an inlet 6 and outlets 7 for a hydraulic active medium, e.g. an oil emulsion is.
  • the press has a hold-down 8 on, against the upper edge 9 of the lower tool 5 is deliverable, in which a sealing device 10, e.g. a circumferential ring seal is arranged.
  • the press ram 1 has on its leading end face 4 a molding surface which depicts the bottom of the molded part, the in the exemplary embodiment shown, local shape contours 11, 12 and 13 in the form of depressions with small radii contains.
  • shaped elements 15, 16 and 17 are resilient. They exist in the embodiment shown, depending on the course of the local Shape contours from strip or cone-shaped bodies made of an elastically deformable material, like Fig.1 and 2 show, on their active surface facing the die have no special contouring.
  • the form elements 15, 16 and 17 are each on a rigid support 18th or exchangeable on the movable link of a hydraulic cylinder fixed. For example, they consist of shaped bodies made of a PU cast resin.

Abstract

A process for deep drawing planar sheet metal, to produce mouldings with local contours with a small radius over the base area, comprises fixing the edges of the sheet metal and forming the sheet metal using a stamper which acts against a fluid work medium. The sheet metal is formed against local mould contours which are fixed and which are elastic.

Description

Die Erfindung betrifft ein Verfahren zum Tiefziehen von ebenen Blechen zu Formteilen mit am Formteilboden angeordneten lokalen Formkonturen mit kleinem Formradius, indem das randseitig eingespannte Blech mittels eines die Kontur des Formteils aufweisenden Stempels gegen ein fluides Wirkmedium umgeformt wird. Ferner betrifft die Erfindung eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for deep drawing flat sheets to form parts arranged on the part bottom local shape contours with a small shape radius by the sheet metal clamped on the edge by means of a contour of the molded part against a fluid active medium is reshaped. The invention further relates to a Device for performing the method.

Verfahren der vorgenannten Art werden auch als hydromechanisches Tiefziehen bezeichnet. Als Wirkmedien haben sich in der Praxis Öl-Emulsionen durchgesetzt. Das vom Niederhalter gegen das Unterwerkzeug eingespannte Blech wird zugleich gegen eine Dichtung gepreßt und dadurch der Raum unterhalb des Blechs abgedichtet. Dieser Raum des Unterwerkzeugs wird anschließend mit der Öl-Emulsion gefüllt, in welchem sich durch die Fahrbewegung des Stempels über das Blech der notwendige Umformdruck aufbaut. Unter dem Druck im Wirkmedium wird das Blech auf den Formstempel aufgeformt. Nach Erreichen der endgültigen Kontur, wird der Druck im Unterwerkzeug abgebaut und kann das Formteil entnommen werden.Methods of the aforementioned type are also called hydromechanical Referred to as deep drawing. As active media have in oil emulsions. That from the hold-down sheet metal clamped against the lower tool becomes at the same time pressed against a seal and thereby the space below of the sheet sealed. This space of the lower tool is then filled with the oil emulsion in which the necessary movement due to the movement of the stamp over the sheet Forming pressure builds up. Under pressure in the active medium the sheet is molded onto the die. After reaching the final contour, the pressure in the lower tool dismantled and the molded part can be removed.

Bei einfachen Formteilkonturen arbeitet dieses Tiefziehverfahren kostengünstig und gegenüber der herkömmlichen Tiefziehtechnik mit geringem Werkzeugverschleiß bei geringerer Beanspruchung von Blech bzw. Formteil. Weist das Formteil in seinem gegen das Wirkmedium umgeformten Boden Formkonturen mit engen Radien, wie lokale Vertiefungen, Sicken, Überhöhungen oder dergleichen auf, die an der vorlaufenden Stirnseite des Preßstempels als entsprechende Konturen ausgebildet sind, erfordert dies vor allem gegen Ende des Umformvorgangs hohe Drücke im Wirkmedium und eine entsprechend hohe Zuhaltekraft zur Gewährleistung der Druckdichtigkeit.This deep-drawing process works with simple molded part contours inexpensive and compared to conventional deep-drawing technology with little tool wear with less Strain on sheet metal or molded part. Instructs the molding shape contours in its bottom, which is shaped against the active medium with tight radii, such as local depressions, beads, Cant or the like on the leading Face of the press ram formed as corresponding contours are required, especially towards the end of the forming process high pressures in the active medium and a corresponding high locking force to ensure pressure tightness.

Der Erfindung liegt die Aufgabe zugrunde, das hydromechanische Tiefziehverfahren dahingehend weiterzuentwickeln, daß Formteile mit lokalen Formkonturen mit kleinen Formradien mit einem solchen Enddruck bzw. einer solchen Niederhaltekraft umgeformt werden können, wie sie für das Umformen von Formteilen ohne solche lokalen Formkonturen notwendig sind. Eine weitere Aufgabe der Erfindung liegt darin, eine zur Durchführung des Verfahrens geeignete Vorrichtung vorzuschlagen.The invention is based, the hydromechanical task To further develop thermoforming processes in such a way that Moldings with local shape contours with small shape radii with such a final pressure or hold-down force can be reshaped as for reshaping Moldings without such local shape contours are necessary. Another object of the invention is to provide a Propose a suitable device to carry out the method.

Die erstgenannte Aufgabe wird bei einem hydromechanischen Tiefziehverfahren der eingangs genannten Art dadurch gelöst, daß das Blech im Bereich der lokalen Formkonturen gegen im Wirkmedium ortsfest positionierte, elastisch nachgiebige Festkörper-Formelemente umgeformt wird.The first task is a hydromechanical one Thermoforming process of the type mentioned at the outset, that the sheet in the area of the local shape contours against resiliently positioned in the active medium Solid-form elements is formed.

Das erfindungsgemäße Verfahren nutzt für den größten Teil der Formänderungsarbeit die Vorteile des hydromechanischen Tiefziehens. Dort, wo dieses Verfahren hohe Wirkmediendrücke und damit eine große Zuhaltekraft erfordert, nämlich beim Umformen lokaler Formkonturen mit kleinen Formradien arbeitet das erfindungsgemäße Verfahren mit einer Art Prägevorgang, bei dem diese Formkonturen durch Aufformen auf elastisch nachgiebige Formelemente ausgeformt werden.The method according to the invention largely uses the deformation work the advantages of the hydromechanical Deep drawing. Wherever this process has high media pressures and therefore requires a large locking force, namely when reshaping local shape contours with small shape radii the method according to the invention works with a kind of embossing process, in which these shape contours by molding resiliently shaped elements are formed.

Dies kann bei im wesentlichen konstant bleibendem Druck im Wirkmedium geschehen.This can take place at a substantially constant pressure in the Active medium happen.

In vorteilhafter Ausführung werden die Formelemente in dem Wirkmedium so positioniert, daß das Blech durch die Bewegung des Formstempels gegen Ende des Umformvorgangs im Bereich der lokalen Formkonturen mittels der Formelemente geprägt wird.In an advantageous embodiment, the shaped elements in the Active medium positioned so that the sheet by the movement of the die at the end of the forming process in the area the local shape contours are shaped by means of the shape elements becomes.

Vorzugsweise werden Formelemente aus einem elastisch verformbaren Werkstoff verwendet, wobei die Formänderungsarbeit an den Formelementen für die Umformung des Blechs sorgt.Preferably, molded elements are made from an elastically deformable Material used, the deformation work on the shaped elements for forming the sheet worries.

Der verwendete, elastisch verformbare Werkstoff sollte ferner hochverschleißfest sein. Vorzugsweise werden Formelemente aus einem Polyurethan-Gießharz verwendet.The elastically deformable material used should also be highly wear-resistant. Form elements are preferred made of a cast polyurethane resin.

Zur Lösung der Aufgabe in vorrichtungstechnischer Hinsicht geht die Erfindung aus von einer Vorrichtung mit einem in einem Pressengestell geführten Formstempel mit der Formkontur des Formteilbodens, einem behälterförmigen Unterwerkzeug mit Zu- und Ablauf für das Wirkmedium und einem das Blech randseitig einspannenden Niederhalter. Eine solche Vorrichtung zeichnet sich erfindungsgemäß dadurch aus, daß in dem Unterwerkzeug gegenüber den lokalen Formkonturen mit kleinem Formradius am Preßstempel Festkörper-Formelemente positioniert sind, die elastisch nachgiebig und in einer solchen Höhe angeordnet sind, daß der Preßstempel mit dem Blech gegen Ende des Umformvorgangs auf die Formelemente aufläuft.To solve the problem in terms of device technology the invention is based on a device with a a press frame guided die with the contour of the molded part bottom, a container-shaped lower tool with inlet and outlet for the active medium and one that Plate holding clamp on the edge. Such The device is characterized in that in the lower tool with respect to the local shape contours small form radius on the press ram solid form elements are positioned that are resilient and flexible in one are arranged such that the ram with the Sheet metal towards the end of the forming process on the form elements accumulates.

Die Festkörper-Formelemente sind im Unterwerkzeug entsprechend der Anordnung der lokalen Formkonturen am Formstempel positioniert. Sie sind in einer solchen Höhe angeordnet, daß sie gegen Ende der Umformbewegung des Formstempels wirksam werden, indem der Formstempel mit dem Blech gegen die Formelemente anläuft und diese elastisch nachgeben, jedoch nur in einem solchen Ausmaß, daß das Blech an den lokalen Formkonturen geprägt wird. Während beim hydromechanischen Tiefziehen für solche Formkonturen Wirkmediendrücke bis zu 1500 bar erzeugt werden müssen, kann bei der erfindungsgemäß ausgebildeten Vorrichtung der Wirkmediendruck auf ca. 100 bar begrenzt bleiben. Auf diese Weise können auch großflächige Werkstücke mit kleinen Formradien auf Vorrichtungen mit relativ geringer Zuhaltekraft geformt werden. Es lassen sich insbesondere auch Radien einformen, die mit der herkömmlichen hydromechanischen Umformung nicht mehr formbar sind.The solid form elements are corresponding in the lower tool the arrangement of the local form contours on the form stamp positioned. They are arranged at such a height that they are towards the end of the forming movement of the die take effect by pressing the stamp against the sheet the form elements tarnish and give way elastically, however only to such an extent that the sheet metal on the local Shape contours is embossed. While the hydromechanical Deep drawing for such shape contours up to 1500 bar must be generated in the invention trained device the active media pressure remain limited to approx. 100 bar. That way you can large workpieces with small form radii Shaped devices with relatively low locking force become. Radii can also be molded in, not with conventional hydromechanical forming are more malleable.

In einer weiterhin vorteilhaften Ausführung können die Formelemente in ihrer Relativlage zum Formstempel eingestellt werden, was vorzugsweise mittels hydraulischer Stellglieder geschieht. Dabei kann mittels der hydraulischen Stellglieder gegebenenfalls ein höherer Druck als der Wirkmediendruck aufgebracht werden.In a further advantageous embodiment, the Form elements set in their relative position to the form stamp be what is preferably hydraulic Actuators happen. The hydraulic Actuators may have a higher pressure than the active media pressure are applied.

Die Formelemente bestehen vorzugsweise aus einem elastisch verformbaren und zudem verschleißfesten Material, wobei sich Polyurethan-Gießharz als besonders vorteilhaft erwiesen hat. Die Formelemente brauchen an ihrer Wirkfläche keine besondere Formkontur aufweisen, vielmehr bildet sich diese durch elastische Formänderung beim Anlaufen des Formstempels mit dem Blech gegen die Formelemente von selbst aus.The shaped elements preferably consist of an elastic deformable and wear-resistant material, whereby polyurethane casting resin has proven to be particularly advantageous Has. The shaped elements do not need any on their active surface have a special shape, rather forms this by elastic change in shape when the die is started with the sheet against the form elements by itself out.

Vorzugsweise sind die Formelemente auswechselbar im Unterwerkzeug angeordnet, um sie bei Verschleiß austauschen zu können.The shaped elements are preferably interchangeable in the lower tool arranged to replace them when worn can.

In einer weiterhin bevorzugter Ausführung ist vorgesehen, daß im Unterwerkzeug Stützen entsprechend den lokalen Formkonturen am Formstempel positioniert und an diesen die elastischen Formelemente auswechselbar befestigt sind. Auf diese Weise läßt sich die Baugröße der Verschleißteile auf das notwendige Maß einschränken. Die Stützen können starr oder auch als hydraulische Stellglieder, z.B. als Hydraulikzylinder, ausgebildet sein, mittels der die Formelemente an den Formstempel zustellbar sind.In a further preferred embodiment, that in the lower tool supports according to the local shape contours positioned on the die and the elastic molded elements are interchangeably attached. On in this way, the size of the wearing parts limit the necessary measure. The supports can be rigid or as hydraulic actuators, e.g. as a hydraulic cylinder, be formed by means of which the shaped elements are deliverable to the form stamp.

Nachstehend ist die Erfindung anhand eines in der Zeichnung wiedergegebenen Ausführungsbeispiels beschrieben. In der Zeichnung zeigen in jeweils schematischer Darstellung:

Fig. 1
eine Ansicht einer hydromechanischen Presse in der Ausgangsposition;
Fig. 2
eine der Fig.1 entsprechende Ansicht in ei- ner Zwischenposition des Formstempels;
Fig. 3
eine entsprechende Ansicht in der Endposi- tion und
Fig. 4
eine vergrößerte Detailansicht in der End- position gemäß Fig.3.
The invention is described below using an exemplary embodiment shown in the drawing. The drawings show in a schematic representation:
Fig. 1
a view of a hydromechanical press in the starting position;
Fig. 2
a view corresponding to Figure 1 in an intermediate position of the die;
Fig. 3
a corresponding view in the end position and
Fig. 4
an enlarged detail view in the end position according to Figure 3.

Die Zeichnung zeigt in schematischer Darstellung nur die im Zusammenhang mit der Erfindung wesentlichen Bauteile einer hydromechanischen Presse. Sie weist als Oberwerkzeug einen Preßstempel 1 auf, der in nicht gezeigten Führungen des Pressengestells vertikal heb- und senkbar ist und dessen im wesentlichen vertikale Umfangsfläche 3 in Verbindung mit der vorlaufenden Stirnfläche 4 die Innenkontur des herzustellenden Formteils bestimmt. Ferner weist die Presse ein Unterwerkzeug 5 auf, das im wesentlichen behälterförmig ausgebildet ist und mit einem Zulauf 6 sowie Abläufen 7 für ein hydraulisches Wirkmedium, z.B. eine Öl-Emulsion, ausgestattet ist. Schließlich weist die Presse einen Niederhalter 8 auf, der gegen den oberen Rand 9 des Unterwerkzeugs 5 zustellbar ist, in welchem eine Dichtungseinrichtung 10, z.B. eine umlaufende Ringdichtung, angeordnet ist.The drawing shows only a schematic representation of the Connection with the invention essential components of a hydromechanical press. It has one as the upper tool Press die 1 on the in the guides, not shown Press frame is vertically raised and lowered and its in essential vertical peripheral surface 3 in connection with the leading end face 4 the inner contour of the to be manufactured Determined molding. The press also instructs Lower tool 5, which is essentially container-shaped is formed and with an inlet 6 and outlets 7 for a hydraulic active medium, e.g. an oil emulsion is. Finally, the press has a hold-down 8 on, against the upper edge 9 of the lower tool 5 is deliverable, in which a sealing device 10, e.g. a circumferential ring seal is arranged.

Der Preßstempel 1 weist an seiner vorlaufenden Stirnseite 4 eine den Boden des Formteils abbildende Formfläche auf, die beim gezeigten Ausführungsbeispiel lokale Formkonturen 11, 12 und 13 in Form von Vertiefungen mit kleinen Formradien enthält.The press ram 1 has on its leading end face 4 a molding surface which depicts the bottom of the molded part, the in the exemplary embodiment shown, local shape contours 11, 12 and 13 in the form of depressions with small radii contains.

Im Unterwerkzeug 5 sind gegenüber den lokalen Formkonturen 11, 12 und 13 am Formstempel 1 Formelemente 15, 16 und 17 angeordnet, die elastisch nachgiebig sind. Sie bestehen beim gezeigten Ausführungsbeispiel je nach Verlauf der lokalen Formkonturen aus leisten- oder zapfenförmigen Körpern aus einem elastisch verformbaren Material, die wie Fig.1 und 2 zeigen, an ihrer dem Formstempel zugekehrten Wirkfläche keine besondere Konturierung aufweisen. Die Formelemente 15, 16 und 17 sind jeweils an einer starren Stütze 18 oder am beweglichen Gied eines Hydraulikzylinders auswechselbar festgelegt. Sie bestehen beispielsweise aus Formkörpern aus einem PU-Gießharz.In the lower tool 5 are compared to the local shape contours 11, 12 and 13 on die 1 shaped elements 15, 16 and 17 arranged, which are resilient. They exist in the embodiment shown, depending on the course of the local Shape contours from strip or cone-shaped bodies made of an elastically deformable material, like Fig.1 and 2 show, on their active surface facing the die have no special contouring. The form elements 15, 16 and 17 are each on a rigid support 18th or exchangeable on the movable link of a hydraulic cylinder fixed. For example, they consist of shaped bodies made of a PU cast resin.

Nach dem Einlegen des Blechs 14 in die geöffnete Presse und Schließen des Niederhalters 8 gegen das Blech 14 und das Unterwerkzeug 5 wird über den Zulauf 6 das hydraulische Medium 19 (Fig.2) in das Unterwerkzeug 5 bei geschlossenen Abläufen 7 eingefüllt. Anschließend fährt der Formstempel 1 nach unten und formt das Blech 14 mit seiner Formkontur 4 um, wie dies in Fig.2 in einem Zwischenstadium gezeigt ist. Dabei findet im Bereich der lokalen Formkonturen 11, 12 und 13 bereits ein Vorformen statt. Gegen Ende der Absenkbewegung läuft der Formstempel 1 mit dem Blech 14 auf die Formelemente 15, 16 und 17 auf, die sich dabei pilzförmig elastisch verformen. Dies ist in Fig.4 in vergrößerter Darstellung gezeigt. Dort sind die lokalen Formkonturen 13 am Preßstempel 1 mit kleinen Formradien erkennbar. Die Umformung des Blechs 14 in diesem Bereich ergibt sich durch eine entsprechende Formänderungsarbeit in den elastischen Formelementen 17, die sich pilzartig verformen.After inserting the sheet 14 in the open press and Closing the hold-down 8 against the sheet 14 and that Lower tool 5 is the hydraulic medium via the inlet 6 19 (Fig.2) in the lower tool 5 when closed Processes 7 filled. Then the die 1 moves downward and forms the sheet 14 with its shape contour 4 around, as shown in Figure 2 at an intermediate stage. It takes place in the area of the local shape contours 11, 12 and 13 preforming is already taking place. Towards the end of the lowering movement the stamp 1 runs with the sheet 14 on the shaped elements 15, 16 and 17, which are mushroom-shaped elastic deform. This is shown in an enlarged view in FIG shown. The local shape contours 13 are there Press die 1 with small radii of shape recognizable. The transformation of the sheet 14 in this area results from a corresponding deformation work in the elastic form elements 17 that deform like mushrooms.

Claims (16)

Verfahren zum Tiefziehen von ebenen Blechen zu Formteilen mit am Formteilboden angeordneten lokalen Formkonturen mit kleinem Formradius, indem das randseitig eingespannte Blech mittels eines die Kontur des Formteils aufweisenden Formstempels gegen ein fluides Wirkmedium umgeformt wird, dadurch gekennzeichnet, daß das Blech im Bereich der lokalen Formkonturen gegen im Wirkmedium ortsfest positionierte, elastisch nachgiebige Festkörper-Formelemente umgeformt wird.Process for deep-drawing flat sheets into shaped parts with local shaped contours arranged on the shaped part bottom and having a small radius, in that the sheet metal clamped on the edge is shaped against a fluid active medium by means of a shaped die having the contour of the shaped part, characterized in that the sheet in the area of the local shaped contours against resiliently shaped, solid-state molded elements are deformed in the active medium. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Formelemente in dem Wirkmedium so positioniert werden, daß das Blech durch die Bewegung des Stempels gegen Ende des Umformvorgangs im Bereich der lokalen Formkonturen mittels der Formelemente geprägt wird.Method according to Claim 1, characterized in that the shaped elements are positioned in the active medium in such a way that the sheet is embossed by the movement of the stamp towards the end of the shaping process in the area of the local shaped contours by means of the shaped elements. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Formelemente in ihrer Relativlage zum Formstempel eingestellt werden. Method according to claim 1 or 2, characterized in that the shaped elements are set in their position relative to the shaped stamp. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die Formelemente mittels hydraulischer Stellglieder eingestellt werden.A method according to claim 3, characterized in that the shaped elements are adjusted by means of hydraulic actuators. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Blech bei im wesentlichen konstanten Druck im Wirkmedium mittels der Formelemente geprägt wird.Method according to one of claims 1 to 4, characterized in that the sheet is embossed at substantially constant pressure in the active medium by means of the shaped elements. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß Formelemente aus einem elastisch verformbaren Werkstoff verwendet werden.Method according to one of claims 1 to 5, characterized in that molded elements made of an elastically deformable material are used. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß Formelemente aus einem verschleißfesten, elastisch verformbaren Werkstoff verwendet werden.Method according to claim 6, characterized in that shaped elements made of a wear-resistant, elastically deformable material are used. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß Formelemente aus einem Polyurethan-Gießharz verwendet werden.Method according to claim 6 or 7, characterized in that molded elements made of a polyurethane casting resin are used. Vorrichtung zum Tiefziehen von ebenen Blechen (14) zu Formteilen mit am Formteilboden angeordneten lokalen Formkonturen (11, 12, 13) mit kleinem Formradius mit einem in einem Pressengestell geführten Formstempel (1) mit der Formkontur des Formteilbodens, einem behälterförmigen Unterwerkzeug (5) mit Zu- und Ablauf (6, 7) für das Wirkmedium (19) und einem das Blech randseitig einspannenden Niederhalter (8), dadurch gekennzeichnet, daß in dem Unterwerkzeug (5) gegenüber den lokalen Formkonturen (11, 12 13) mit kleinem Formradius am Formstempel (1) Festkörper-Formelemente (15, 16, 17) positioniert sind, die elastisch nachgiebig und in einer solchen Höhe angeordnet sind, daß der Formstempel (1) mit dem Blech (14) gegen Ende des Umformvorgangs auf die Formelemente (15, 16, 17) aufläuft.Device for deep-drawing flat sheets (14) into molded parts with local molded contours (11, 12, 13) with a small mold radius arranged on the molded part base with a die (1) guided in a press frame with the molded contour of the molded part base, a container-shaped lower tool (5) Inlet and outlet (6, 7) for the active medium (19) and a hold-down device (8) which clamps the sheet metal on the edge, characterized in that in the lower tool (5) compared to the local shape contours (11, 12 13) with a small shape radius on Shaping dies (1) solid-shaped elements (15, 16, 17) are positioned, which are resilient and arranged at such a height that the shaping stamp (1) with the sheet metal (14) towards the end of the shaping process onto the shaped elements (15, 16, 17). Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß die Formelemente (15, 16, 17) aus einem elastisch verformbaren Material bestehen.Device according to claim 9, characterized in that the shaped elements (15, 16, 17) consist of an elastically deformable material. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß die Formelemente (15, 16, 17) aus einem verschleißfesten Material bestehen.Device according to claim 10, characterized in that the shaped elements (15, 16, 17) consist of a wear-resistant material. Vorrichtung nach Anspruch 10 oder 11, dadurch gekennzeichnet, daß die Formelemente (15, 16, 17) aus einem Polyurethan-Gießharz bestehen.Device according to claim 10 or 11, characterized in that the shaped elements (15, 16, 17) consist of a polyurethane casting resin. Vorrichtung nach einem der Ansprüche 9 bis 12, dadurch gekennzeichnet, daß die Formelemente (15, 16, 17) auswechselbar im Unterwerkzeug (5) angeordnet sind.Device according to one of claims 9 to 12, characterized in that the shaped elements (15, 16, 17) are interchangeably arranged in the lower tool (5). Vorrichtung nach einem der Ansprüche 9 bis 13, dadurch gekennzeichnet, daß im Unterwerkzeug (5) Stützen (18) entsprechend den lokalen Formkonturen (11, 12, 13) am Formstempel (1) positioniert und an diesen die elastischen Formelemente (15, 16, 17) auswechselbar befestigt sind.Device according to one of claims 9 to 13, characterized in that supports (18) are positioned in the lower tool (5) in accordance with the local form contours (11, 12, 13) on the form stamp (1) and the elastic form elements (15, 16, 17) are interchangeably attached. Vorrichtung nach Anspruch 14, dadurch gekennzeichnet, daß die Stützen als hydraulische Stellglieder ausgebildet sind.Apparatus according to claim 14, characterized in that the supports are designed as hydraulic actuators. Vorrichtung nach Anspruch 15, dadurch gekennzeichnet, daß die Formelemente (15, 16, 17) mittels der hydraulischen Stellglieder in Richtung zum Formstempel (1) zustellbar sind.Apparatus according to claim 15, characterized in that the shaped elements (15, 16, 17) can be advanced in the direction of the shaped die (1) by means of the hydraulic actuators.
EP01107980A 2000-04-20 2001-03-29 Method and apparatus for deep-drawing sheet-metal workpieces Withdrawn EP1147833A3 (en)

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CN107952872A (en) * 2017-12-08 2018-04-24 山东大学 Progressive molding device and method is aided in based on the hydraulic pressure that adjustable flexibility supports more

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