EP2569108B1 - Bending method and bending apparatus - Google Patents

Bending method and bending apparatus Download PDF

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Publication number
EP2569108B1
EP2569108B1 EP11718357.4A EP11718357A EP2569108B1 EP 2569108 B1 EP2569108 B1 EP 2569108B1 EP 11718357 A EP11718357 A EP 11718357A EP 2569108 B1 EP2569108 B1 EP 2569108B1
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Prior art keywords
bending
sheet
section
die
edge
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EP11718357.4A
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German (de)
French (fr)
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EP2569108A1 (en
Inventor
Michael Schott
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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Priority to PL11718357T priority Critical patent/PL2569108T3/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
    • B21D19/00—Flanging or other edge treatment, e.g. of tubes
    • B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
    • B21D5/042—With a rotational movement of the bending blade

Definitions

  • the present invention relates to a bending method and a bending device with a bending punch and a die having a bending edge. Likewise, a use of the bending process is the subject of the invention.
  • a method has been proposed, with the sheets over-arched, that can be folded by an angle of more than 90 °. This should be counteracted in the first place springing back to an angle of less than 90 °.
  • the proposed device is characterized by a very complex structure. From the JP 5 305342 A a bending method is known in which by moving together a die having a bending edge and a pivot member having the pivot member is brought into contact with a holding portion of a disposed between the die and the punch sheet, the pivot member is pivoted and by the pivoting of the pivot member a Bending portion of the sheet is bent around the bending edge of the die.
  • a bending device comprising a bending punch and a die having a bending edge
  • the bending punch has a pivotally mounted pivot member having a contact portion and a forming portion
  • the pivot member is pivotable and, by by the pivoting of the forming a force on the bending portion of bending sheet can exert, which has an angle to the bending edge, lying in the plane of the holding portion component, the bending portion of the sheet to be bent around the bending edge of the die is bendable.
  • the object of the present invention is to provide a bending method with which sheet metal elements with over-arched sections can be produced in a process-reliable manner with reduced plant and cost expenditure.
  • a bending device is to be provided with which the bending process can be carried out.
  • an advantageous use of the bending process is to be specified.
  • this object is procedurally achieved by a bending method according to claim 1.
  • the collapse can be ensured by a movement of the punch relative to a stationary die or a movement of the die relative to a fixed punch. But it is also conceivable to move both die and bending punch relative to each other.
  • a first embodiment provides that a contact portion of the pivot member is brought into contact with the holding portion of the sheet and by the pivoting of the pivot member with a forming portion of the pivot member, a force is exerted on the bending portion of the sheet, which is angled to the bending edge, in the plane having the holding portion lying component.
  • the available power for the deformation of the sheet metal can be better utilized. It engages in a more favorable angle to the bending portion and thus allows an even softer forming of the bending section.
  • the contact section of the pivoting element is unrolled during bending on the holding section of the metal sheet.
  • the rolling movement the occurrence of scratches or bruises on the surface of the holding section can be avoided. Therefore, it is conceivable to bend sheets with a very delicate, for example, a painted, chrome-plated and / or high-gloss, surface with bending process.
  • the sheet is held by a hold-down on the die during bending. On In this way, a movement of the sheet during the forming process can be prevented, so that the dimensional accuracy of the bent sheet can be improved.
  • the method can be further developed by bending the bending section of the sheet by a bending angle of more than 90 °, more than 105 °, more than 120 °, up to 135 ° around the bending edge.
  • a bending angle of more than 90 ° sheet metal parts with a vertical fold can also be made available for a spring-back sheet metal material. Bending by a bending angle of more than 105 ° makes it possible in a particularly simple manner to arrange a structural element in the formed acute angle of 75 ° and to connect this by folding with the metal sheet.
  • the subsequent folding can be considerably simplified with a slight restriction of the mounting space required for arranging a structural element.
  • the force required for bending can be limited to a practicable level.
  • a composite sheet, a solid sheet or a lightweight sheet is bent.
  • Composite sheets are multilayer sheets in which at least two layers are made of different materials. Typically, for example, layers of plastic are combined with metal layers. Composite sheets can result in weight savings compared to a solid sheet for the same thickness.
  • composite sheets are in particular such sheets in question, which are made of two outer cover plates, for example made of steel and a connecting layer of a plastic.
  • the thickness of the cover sheets is for example 0.30 to 2.00 mm; the thickness of the layer of plastic, for example 0.05 to 1.5 mm.
  • Such composite sheets are characterized by a particularly high structure-borne sound attenuation.
  • lightweight sheets composite sheets which consist of very thin, such as steel sheets, which include a plastic layer.
  • the thicknesses of the steel sheets are 0.1 mm to 0.3 mm.
  • the core layer for example, a 0.05 mm to 1.5 mm thick layer of, for example, thermoplastic material may be provided.
  • the thermoplastic material is characterized not only by good formability, especially at higher temperatures, but can significantly simplify the production of lightweight sheet metal.
  • a lightweight sheet offers very good stiffness especially weight advantages.
  • a further development provides that, after bending the bending section of the sheet, the bending section of the sheet is bent back by a second angle by a first bending angle.
  • stresses generated in the sheet by bending can be at least partially reduced.
  • a time-delayed delamination can be counteracted in the transition region of the holding section and bending section of a composite sheet.
  • Under a delayed delamination is an unintentional Separating the inner cover plate and / or the outer cover plate of the composite sheet understood by the inner cover plate and the outer cover plate connecting plastic layer, which does not have to be done directly during bending, but can occur only after a certain time.
  • an embodiment of the bending process provides that the sheet is folded.
  • the folding allows on the one hand from the sheet metal components with rounded and thus less injurious edges to produce.
  • the sheet can be connected to other sheets and / or structural elements in a particularly simple manner, without the need for special fasteners such as rivets, adhesives or solders are needed. The costs and the work involved in the production of sheet metal components can thus be further reduced.
  • the device makes it possible to better utilize the available for the deformation of the sheet force. You can attack at a more favorable angle to the bending section to be bent, so that a softer forming can be guaranteed.
  • a first embodiment provides that the contact section and the forming section of the pivoting element are rigidly connected to each other.
  • the rigid connection allows a particularly simple construction of the device and thus a cost-effective device.
  • the reliability of the device and thus the process reliability of the bending process can be further increased by the rigid connection of the contact portion with the forming section.
  • the device can be further, by the pivoting element is mounted with a pivot axis in the bending punch.
  • the pivot axis stationary or movable relative to the bending punch.
  • a pivot axis arranged movably allows a simple construction of the die of the bending punch, since this only performs a vertical movement.
  • the pivot axis fixedly arranged on the bending punch simplifies the construction of the punch itself.
  • a next development provides that by the pivot axis in the bending punch is movable in the radial direction and the pivot member of a guide element, in particular on its outer contour, is feasible, the contact portion of the pivoting element on the bending Sheet metal is unrolled.
  • This embodiment of the bending device allows a particularly gentle surface bending process, so that sheets with sensitive surfaces can be bent.
  • the pivot axis is aligned parallel to the bending edge, the bending portion of the sheet can be bent simultaneously over its entire width.
  • the device can also be embodied by virtue of the fact that the bending device has a hold-down device. This allows to accurately fix the holding portion of a sheet to be bent and thus to achieve a particularly high dimensional accuracy with respect to the bent sheet metal.
  • the bending edge of the die is provided with a recess extending along the bending edge.
  • material of the sheet can be added and thus the compressive and tensile loads are reduced.
  • the risk of cracking on the outside can therefore be further reduced.
  • material of the inner cover plate of a composite metal sheet can be received in the transition region from the holding section to the bending section of the recess and a delamination in this area between the inner cover plate and plastic layer and / or between plastic layer and outer cover plate and plastic layer can be effected. This may increase the risk of cracking the outside lying cover plate can be reduced when folding composite sheets.
  • the bending device can be characterized in that the bending edge of the die is interchangeable.
  • the bending device can thus be easily adapted to different bending radii and different bending angles. Also in this way both bending edges with a recess running along the bending edge and bending edges which have no such recess can be used in the same bending device.
  • the above-mentioned object has been achieved in that the bending method is used to produce a vehicle element, in particular an end wall element and / or hood element.
  • FIG. 1 an embodiment of a bending device with a bending punch 4 and a die 2 is shown.
  • the bending punch 4 has a pivoting element 3 with a contact section 8 and a forming section 9 rigidly connected to the contact section 8.
  • FIG. 1a the state of the bending device is shown at the beginning of the bending process.
  • a plate 6 is held with its holding portion 5 by a hold-down 10 on the die 2 that it projects laterally with its bending portion 7 on the interchangeable bending edge 1 of the die 2 addition.
  • the sheet metal 6 shown is a solid sheet 6.
  • the contact portion 8 of the pivot member 3 is brought into contact with the holding portion 5 of the sheet 6 and the pivot member 3 is pivoted.
  • the bending section 7 of the sheet 6 is bent by a bending angle ⁇ of 130 ° about the bending edge 1 of the die 2.
  • the pivoting element 3 is mounted with a pivot axis 11 in the bending punch 4.
  • the pivot axis 11 is aligned parallel to the bending edge 1.
  • the pivot axis 11 can move in the bending punch 4 in the radial direction.
  • the pivoting element 3 is guided with a guide element 12, so that the contact portion 8 of the pivoting element 3 can roll on the holding portion 5 of the sheet 6.
  • other types of coupling for example via gears and racks are conceivable.
  • pivot axis 11 can also, as dashed lines in the Fig. 1a indicated, relative to the bending punch 4 are arranged stationary and thus a bending device with an increased rigidity are provided.
  • Fig. 2 shows the same bending device as Fig. 1 in which according to the invention, however, the die 2 'has a bending edge 1' with a recess 14 'extending along the bending edge 1'.
  • the technical effect of this recess 14 'during bending is explained with reference to a composite sheet 6'.
  • the outer cover plates 16 ', 17' of the composite sheet 6 ' are made of a steel sheet having a thickness of 400 .mu.m and connected to each other via a middle, consisting of a viscoelastic plastic layer 18' of 25 microns.
  • FIG. 3 shows a detail of a vehicle element 15 "in the form of a bonnet, which has a composite sheet 6" and a structural element 19 ".
  • the bending section 7 '' of the composite sheet 6 '' was first according to the in Fig. 2 shown bent by a bending angle of more than 90 ° and the inner cover plate 16 '' by delamination in the transition region of holding section 5 '' and bending section 7 '' separated from the plastic layer 18 ''.
  • a structural element 19 '' arranged and connected by folding the composite sheet 6" this fixed to the structural element 19 ''.
  • the outer cover plate 17 '' has no cracks even after the 180 ° fold.
  • a device is shown, the bending back one with, for example, in the Fig. 1 Bender shown by a bending angle ⁇ '''bent bending portion 7''' of a sheet 6 '''by a bending angle ⁇ ''' allows.
  • These are in the present case a composite sheet 6 '''.
  • the device has for this purpose a frame 20 ''', with which the angle ⁇ ''' is given to the bending portion 7 '''of the sheet 6 '''to be bent back.
  • the frame 20 ''' serves at the same time to hold the sheet 6''' on the machine table 21 '''.
  • each of these two functions a separate device element.
  • a punch 22 ''' is provided, with which the force required for bending in the sheet 6''' is initiated.
  • the punch 22 ''' is driven either hydraulically or pneumatically.
  • an electric motor for example a linear motor, for this purpose.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Description

Die vorliegende Erfindung betrifft ein Biegeverfahren und eine Biegevorrichtung mit einem Biegestempel und einer eine Biegekante aufweisenden Matrize. Ebenso ist eine Verwendung des Biegeverfahrens Gegenstand der Erfindung.The present invention relates to a bending method and a bending device with a bending punch and a die having a bending edge. Likewise, a use of the bending process is the subject of the invention.

Es ist bekannt, Bleche mit Strukturelementen durch Falzen zu verbinden. Dabei werden die Kanten der Bleche um entsprechende Vorsprünge der Strukturelemente um ca. 180° umgebogen. Bei den üblichen Verfahren ist es notwendig, die Kanten der Bleche zunächst auf ca. 90° abzukanten und anschließend auf z.B. 120° bis 135° vorzufalzen, bevor die Bleche schließlich durch das eigentliche Falzen auf ca. 180° fest mit dem Strukturelement verbunden werden können. Für die Herstellung einer Falzverbindung werden jedenfalls mindestens drei Arbeitsschritte benötigt. Zudem werden für den Abkantschritt und den Vorfalzschritt zwei verschiedene Werkzeuge benötigt. Beim Falzen müssen die Bleche nicht zwangsläufig mit einem Strukturelement verbunden werden. Das Falzen kann auch zur Herstellung weniger scharfkantiger Bauteilkanten mit einem entsprechend verringerten Verletzungsrisiko dienen.It is known to connect sheets with structural elements by folding. The edges of the sheets are bent by corresponding projections of the structural elements by approximately 180 °. In the usual methods, it is necessary to first edge the edges of the sheets to about 90 ° and then to e.g. Pre-roll 120 ° to 135 ° before the sheets can finally be connected by the actual folding to about 180 ° fixed to the structural element. In any case, at least three steps are required for the production of a rabbet joint. In addition, two different tools are needed for the bending step and the pre-folding step. When folding, the sheets need not necessarily be connected to a structural element. The folding can also serve to produce less sharp-edged component edges with a correspondingly reduced risk of injury.

In der DE 102 23 637 B4 ist ein Verfahren vorgeschlagen worden, mit dem Bleche überbogen, d.h. um einen Winkel von mehr als 90° abgekantet werden können. Damit soll in erster Linie einem Zurückfedern auf einen Winkel von weniger als 90° entgegengewirkt werden. Die dazu vorgeschlagene Vorrichtung zeichnet sich jedoch durch einen sehr komplexen Aufbau auf. Aus der JP 5 305342 A ist ein Biegeverfahren bekannt, bei welchem durch Zusammenfahren einer eine Biegekante aufweisenden Matrize und eines ein Schwenkelement aufweisenden Biegestempels das Schwenkelement mit einem Halteabschnitt eines zwischen der Matrize und dem Biegestempel angeordneten Bleches in Kontakt gebracht wird, das Schwenkelement verschwenkt wird und durch das Schwenken des Schwenkelements ein Biegeabschnitt des Bleches um die Biegekante der Matrize gebogen wird.In the DE 102 23 637 B4 a method has been proposed, with the sheets over-arched, that can be folded by an angle of more than 90 °. This should be counteracted in the first place springing back to an angle of less than 90 °. However, the proposed device is characterized by a very complex structure. From the JP 5 305342 A a bending method is known in which by moving together a die having a bending edge and a pivot member having the pivot member is brought into contact with a holding portion of a disposed between the die and the punch sheet, the pivot member is pivoted and by the pivoting of the pivot member a Bending portion of the sheet is bent around the bending edge of the die.

Aus der JP 5 305342 A ist ebenfalls eine Biegevorrichtung bekannt, mit einem Biegestempel und einer eine Biegekante aufweisenden Matrize, wobei der Biegestempel ein schwenkbar gelagertes Schwenkelement mit einem Kontaktabschnitt und einem Umformabschnitt aufweist, das Schwenkelement verschwenkbar ist und, indem durch das Schwenken der Umformabschnitt eine Kraft auf den Biegeabschnitt des zu biegenden Bleches ausüben kann, welche eine winklig zur Biegekante, in der Ebene des Halteabschnittes liegende Komponente aufweist, der Biegeabschnitt des zu biegenden Bleches um die Biegekante der Matrize biegbar ist.From the JP 5 305342 A Also, a bending device is known, comprising a bending punch and a die having a bending edge, the bending punch has a pivotally mounted pivot member having a contact portion and a forming portion, the pivot member is pivotable and, by by the pivoting of the forming a force on the bending portion of bending sheet can exert, which has an angle to the bending edge, lying in the plane of the holding portion component, the bending portion of the sheet to be bent around the bending edge of the die is bendable.

Hiervon ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Biegeverfahren anzugeben, mit dem bei reduziertem Anlagen- und Kostenaufwand auf prozesssichere Weise Blechelemente mit überbogenen Abschnitten hergestellt werden können. Ebenso soll eine Biegevorrichtung zur Verfügung gestellt werden, mit der sich das Biegeverfahren durchführen lässt. Schließlich soll eine vorteilhafte Verwendung des Biegeverfahrens angegeben werden.Proceeding from this, the object of the present invention is to provide a bending method with which sheet metal elements with over-arched sections can be produced in a process-reliable manner with reduced plant and cost expenditure. Likewise, a bending device is to be provided with which the bending process can be carried out. Finally, an advantageous use of the bending process is to be specified.

Nach einer ersten Lehre der Erfindung wird diese Aufgabe verfahrensmäßig durch ein Biegeverfahren gemäß Anspruch 1 gelöst.According to a first teaching of the invention, this object is procedurally achieved by a bending method according to claim 1.

Das Zusammenfahren kann durch eine Bewegung des Biegestempels gegenüber einer feststehenden Matrize oder eine Bewegung der Matrize gegenüber einem feststehenden Biegestempel gewährleistet werden. Es ist aber ebenfalls denkbar, sowohl Matrize als auch Biegestempel relativ zueinander zu bewegen.The collapse can be ensured by a movement of the punch relative to a stationary die or a movement of the die relative to a fixed punch. But it is also conceivable to move both die and bending punch relative to each other.

Es hat sich gezeigt, dass mit dem erfindungsgemäßen Verfahren trotz der linearen Relativbewegung von Matrize und Biegestempel ein sehr weiches Umformen des Blechs ermöglicht wird. Das Risiko einer Rissbildung beim Biegen kann somit verringert werden. Vor allem werden mit dem erfindungsgemäßen Verfahren auch größere Biegewinkel in einem Arbeitsgang ermöglicht.It has been found that, despite the linear relative movement of the die and the bending punch, a very soft forming of the sheet is made possible by the method according to the invention. The risk of cracking during bending can thus be reduced. Above all, larger bending angles are made possible in a single operation with the method according to the invention.

Eine erste Ausgestaltung sieht vor, dass ein Kontaktabschnitt des Schwenkelementes mit dem Halteabschnitt des Bleches in Kontakt gebracht wird und durch das Schwenken des Schwenkelements mit einem Umformabschnitt des Schwenkelementes eine Kraft auf den Biegeabschnitt des Bleches ausgeübt wird, welche eine winklig zur Biegekante, in der Ebene des Halteabschnittes liegende Komponente aufweist. Auf diese Weise kann die für die Umformung des Bleches zur Verfügung stehende Kraft besser genutzt werden. Sie greift in einem günstigeren Winkel an dem Biegeabschnitt an und lässt somit ein noch weicheres Umformen des Biegeabschnittes zu. Im Extremfall ist es auch denkbar, die Kraft in einer im Wesentlichen ausschließlich in einer zur Biegekante winkligen, in der Ebene des Halteabschnittes liegenden Richtung auf den Biegeabschnitt des Bleches auszuüben.A first embodiment provides that a contact portion of the pivot member is brought into contact with the holding portion of the sheet and by the pivoting of the pivot member with a forming portion of the pivot member, a force is exerted on the bending portion of the sheet, which is angled to the bending edge, in the plane having the holding portion lying component. In this way, the available power for the deformation of the sheet metal can be better utilized. It engages in a more favorable angle to the bending portion and thus allows an even softer forming of the bending section. In extreme cases, it is also conceivable to exert the force in a direction substantially perpendicular to the bending edge, lying in the plane of the holding portion direction on the bending portion of the sheet.

In einer nächsten Weiterbildung des Biegeverfahrens wird der Kontaktabschnitt des Schwenkelementes während des Biegens auf dem Halteabschnitt des Bleches abgerollt. Durch die Abrollbewegung kann das Auftreten von Kratzern oder Druckstellen auf der Oberfläche des Halteabschnittes vermieden werden. Daher ist es denkbar, auch Bleche mit einer sehr empfindlichen, beispielsweise einer lackierten, verchromten und/oder hochglänzenden, Oberfläche mit Biegeverfahren zu biegen.In a next development of the bending method, the contact section of the pivoting element is unrolled during bending on the holding section of the metal sheet. By the rolling movement, the occurrence of scratches or bruises on the surface of the holding section can be avoided. Therefore, it is conceivable to bend sheets with a very delicate, for example, a painted, chrome-plated and / or high-gloss, surface with bending process.

Gemäß einer weiteren Ausgestaltung wird das Blech während des Biegens von einem Niederhalter an der Matrize gehalten. Auf diese Weise lässt sich eine Bewegung des Bleches während des Umformvorgangs verhindern, so dass die Maßhaltigkeit des gebogenen Bleches verbessert werden kann.According to a further embodiment, the sheet is held by a hold-down on the die during bending. On In this way, a movement of the sheet during the forming process can be prevented, so that the dimensional accuracy of the bent sheet can be improved.

Weiterbilden lässt sich das Verfahren ferner dadurch, dass der Biegeabschnitt des Bleches um einen Biegewinkel von mehr als 90°, mehr als 105°, mehr als 120°, bis zu 135° um die Biegekante gebogen wird. Bei einem Biegewinkel von mehr als 90° können auch bei einem zurückfedernden Blechmaterial Blechteile mit einer senkrechten Abkantung zur Verfügung gestellt werden. Ein Biegen um einen Biegewinkel von mehr als 105° ermöglicht es auf besonders einfache Weise, in dem gebildeten spitzen Winkel von 75° ein Strukturelement anzuordnen und dieses durch Falzen mit dem Blech zu verbinden. Mit einem Biegewinkel von mehr als 120° kann bei einem geringfügigen Einschränken des für das Anordnen eines Strukturelements benötigten Montageraums das nachfolgende Falzen deutlich vereinfacht werden. Indem der Biegewinkel auf weniger als 135° limitiert wird, lässt sich der für das Biegen benötigte Kraftaufwand auf ein praxisgerechtes Maß begrenzen.Furthermore, the method can be further developed by bending the bending section of the sheet by a bending angle of more than 90 °, more than 105 °, more than 120 °, up to 135 ° around the bending edge. With a bending angle of more than 90 °, sheet metal parts with a vertical fold can also be made available for a spring-back sheet metal material. Bending by a bending angle of more than 105 ° makes it possible in a particularly simple manner to arrange a structural element in the formed acute angle of 75 ° and to connect this by folding with the metal sheet. With a bending angle of more than 120 °, the subsequent folding can be considerably simplified with a slight restriction of the mounting space required for arranging a structural element. By limiting the bending angle to less than 135 °, the force required for bending can be limited to a practicable level.

In einer nächsten Weiterbildung des Verfahrens wird ein Verbundblech, ein Vollblech oder ein Leichtblech gebogen.In a next development of the method, a composite sheet, a solid sheet or a lightweight sheet is bent.

Verbundbleche sind mehrlagige Bleche, bei denen mindestens zwei Lagen aus unterschiedlichen Materialien hergestellt sind. Typischerweise werden beispielsweise Lagen aus Kunststoff mit Metalllagen kombiniert. Verbundbleche können bei gleicher Dicke zu Gewichtseinsparungen im Vergleich zu einem Vollblech führen.Composite sheets are multilayer sheets in which at least two layers are made of different materials. Typically, for example, layers of plastic are combined with metal layers. Composite sheets can result in weight savings compared to a solid sheet for the same thickness.

Als Verbundbleche kommen insbesondere solche Bleche in Frage, die aus zwei außen liegenden Deckblechen beispielsweise aus Stahl und einer diese verbindende Schicht aus einem Kunststoff gefertigt sind. Die Dicke der Deckbleche beträgt beispielsweise 0,30 bis 2,00 mm; die Dicke der Schicht aus Kunststoff beispielsweise 0,05 bis 1,5 mm. Derartige Verbundbleche zeichnen sich durch eine besonders hohe Körperschalldämpfung aus. Als Leichtbleche werden Verbundbleche bezeichnet, welche aus sehr dünnen, beispielsweise Stahlblechen bestehen, die eine Kunststoffschicht einschließen. Die Dicken der Stahlbleche betragen 0,1 mm bis 0,3 mm. Als Kernschicht kann beispielsweise eine 0,05 mm bis 1,5 mm dicke Schicht aus beispielsweise thermoplastischem Kunststoff vorgesehen sein. Der thermoplastische Kunststoff zeichnet sich nicht nur durch eine gute Umformbarkeit, insbesondere bei höheren Temperaturen aus, sondern kann die Herstellung des Leichtblechs deutlich vereinfachen. Ein Leichtblech bietet bei sehr guter Steifigkeit vor allem Gewichtsvorteile.As composite sheets are in particular such sheets in question, which are made of two outer cover plates, for example made of steel and a connecting layer of a plastic. The thickness of the cover sheets is for example 0.30 to 2.00 mm; the thickness of the layer of plastic, for example 0.05 to 1.5 mm. Such composite sheets are characterized by a particularly high structure-borne sound attenuation. As lightweight sheets composite sheets are called, which consist of very thin, such as steel sheets, which include a plastic layer. The thicknesses of the steel sheets are 0.1 mm to 0.3 mm. As the core layer, for example, a 0.05 mm to 1.5 mm thick layer of, for example, thermoplastic material may be provided. The thermoplastic material is characterized not only by good formability, especially at higher temperatures, but can significantly simplify the production of lightweight sheet metal. A lightweight sheet offers very good stiffness especially weight advantages.

Durch die Verwendung eines Vollbleches können bei gleicher Materialstärke sehr hohe Biegesteifigkeiten erzielt werden.By using a solid sheet very high bending stiffness can be achieved with the same material thickness.

Ferner sieht eine Weiterbildung vor, dass nach dem Biegen des Biegeabschnittes des Bleches um einen ersten Biegewinkel der Biegeabschnitt des Bleches um einen zweiten Winkel zurückgebogen wird. Dadurch lassen sich in dem Blech durch das Biegen erzeugte Spannungen zumindest teilweise abbauen. Insbesondere kann einer zeitverzögerten Delamination im Übergangsbereich vom Halteabschnitt und Biegeabschnitt eines Verbundbleches entgegengewirkt werden. Unter einer zeitverzögerten Delamination wird dabei ein ungewolltes Trennen des inneren Deckbleches und/oder des äußeren Deckbleches des Verbundbleches von der das innere Deckblech und das äußere Deckblech verbindenden Kunststoffschicht verstanden, wobei dies nicht direkt beim Biegen erfolgen muss, sondern auch erst nach einer gewissen Zeit auftreten kann.Furthermore, a further development provides that, after bending the bending section of the sheet, the bending section of the sheet is bent back by a second angle by a first bending angle. As a result, stresses generated in the sheet by bending can be at least partially reduced. In particular, a time-delayed delamination can be counteracted in the transition region of the holding section and bending section of a composite sheet. Under a delayed delamination is an unintentional Separating the inner cover plate and / or the outer cover plate of the composite sheet understood by the inner cover plate and the outer cover plate connecting plastic layer, which does not have to be done directly during bending, but can occur only after a certain time.

Weiter sieht eine Ausgestaltung des Biegeverfahrens vor, dass das Blech gefalzt wird. Das Falzen erlaubt es einerseits aus dem Blech Bauteile mit abgerundeten und somit weniger verletzungsträchtigen Kanten herzustellen. Andererseits kann durch das Falzen das Blech mit weiteren Blechen und/oder Strukturelementen auf besonders einfache Weise verbunden werden, ohne dass dazu besondere Verbindungsmittel wie Nieten, Klebstoffe oder Lote benötigt werden. Die Kosten und der Arbeitsaufwand bei der Herstellung von Blechbauteilen lassen sich somit weiter reduzieren.Furthermore, an embodiment of the bending process provides that the sheet is folded. The folding allows on the one hand from the sheet metal components with rounded and thus less injurious edges to produce. On the other hand, by folding, the sheet can be connected to other sheets and / or structural elements in a particularly simple manner, without the need for special fasteners such as rivets, adhesives or solders are needed. The costs and the work involved in the production of sheet metal components can thus be further reduced.

Nach einer zweiten Lehre der Erfindung wird die oben genannte Aufgabe in Bezug auf die Vorrichtung durch eine Biegevorrichtung gemäß Anspruch 9 gelöst.According to a second teaching of the invention, the above-mentioned object with respect to the device by a bending device according to claim 9 is achieved.

Die Vorrichtung erlaubt es, die für die Umformung des Bleches zur Verfügung stehende Kraft besser zu nutzen. Sie kann in einem günstigeren Winkel an dem zu biegenden Biegeabschnitt angreifen, so dass ein weicheres Umformen gewährleistet werden kann.The device makes it possible to better utilize the available for the deformation of the sheet force. You can attack at a more favorable angle to the bending section to be bent, so that a softer forming can be guaranteed.

Eine erste Ausgestaltung sieht vor, dass der Kontaktabschnitt und der Umformabschnitt des Schwenkelements starr miteinander verbunden sind. Die starre Verbindung ermöglicht einen besonders einfachen Aufbau der Vorrichtung und somit eine kostengünstige Vorrichtung. Zudem lässt sich durch die starre Verbindung des Kontaktabschnittes mit dem Umformabschnitt die Zuverlässigkeit der Vorrichtung und somit die Prozesssicherheit des Biegeverfahrens weiter erhöhen.A first embodiment provides that the contact section and the forming section of the pivoting element are rigidly connected to each other. The rigid connection allows a particularly simple construction of the device and thus a cost-effective device. In addition, the reliability of the device and thus the process reliability of the bending process can be further increased by the rigid connection of the contact portion with the forming section.

Weiterbilden lässt sich die Vorrichtung ferner, indem das Schwenkelement mit einer Schwenkachse in dem Biegestempel gelagert ist. Auf diese Weise wird ein besonders einfacher Aufbau der Biegevorrichtung ermöglicht. Es ist denkbar, die Schwenkachse bezogen auf dem Biegestempel ortsfest oder bewegbar anzuordnen. Eine bewegbar angeordnete Schwenkachse ermöglicht einen einfachen Aufbau des Gesenks des Biegestempels, da dieser lediglich eine vertikale Bewegung durchführt. Die am Biegestempel ortsfest angeordnete Schwenkachse vereinfacht dagegen den Aufbau des Biegestempels selbst.Further, the device can be further, by the pivoting element is mounted with a pivot axis in the bending punch. In this way, a particularly simple construction of the bending device is made possible. It is conceivable to arrange the pivot axis stationary or movable relative to the bending punch. A pivot axis arranged movably allows a simple construction of the die of the bending punch, since this only performs a vertical movement. On the other hand, the pivot axis fixedly arranged on the bending punch simplifies the construction of the punch itself.

Eine nächste Weiterbildung sieht vor, dass, indem die Schwenkachse in dem Biegestempel in Radialrichtung beweglich ist und das Schwenkelement von einem Führungselement, insbesondere an seiner Außenkontur, führbar ist, der Kontaktabschnitt des Schwenkelementes auf dem zu biegenden Blech abrollbar ist. Diese Ausgestaltung der Biegevorrichtung ermöglicht einen besonders oberflächenschonenden Biegevorgang, so dass auch Bleche mit empfindlichen Oberflächen gebogen werden können.A next development provides that by the pivot axis in the bending punch is movable in the radial direction and the pivot member of a guide element, in particular on its outer contour, is feasible, the contact portion of the pivoting element on the bending Sheet metal is unrolled. This embodiment of the bending device allows a particularly gentle surface bending process, so that sheets with sensitive surfaces can be bent.

Sofern in einer weiteren Ausgestaltung die Schwenkachse parallel zur Biegekante ausgerichtet ist, kann der Biegeabschnitt des Bleches zeitgleich über seine gesamte Breite gebogen werden.If in another embodiment, the pivot axis is aligned parallel to the bending edge, the bending portion of the sheet can be bent simultaneously over its entire width.

Ausgestalten lässt sich die Vorrichtung auch dadurch, dass die Biegevorrichtung einen Niederhalter aufweist. Dieser erlaubt es, den Halteabschnitt eines zu biegenden Bleches genau zu fixieren und somit eine besonders hohe Maßhaltigkeit im Hinblick auf das gebogene Blech zu erreichen.The device can also be embodied by virtue of the fact that the bending device has a hold-down device. This allows to accurately fix the holding portion of a sheet to be bent and thus to achieve a particularly high dimensional accuracy with respect to the bent sheet metal.

Die Biegekante der Matrize ist mit einer entlang der Biegekante verlaufenden Ausnehmung versehen. Während des Biegens kommt es an der Innenseite des Bleches zwangsläufig zu einer Druckbelastung und an der Außenseite des Bleches zu einer korrespondierenden Zugbelastung. In der Ausnehmung kann Material des Bleches aufgenommen werden und somit die Druck-und Zugbelastungen verringert werden. Die Gefahr einer Rissbildung an der Außenseite kann demzufolge weiter reduziert werden. Beispielsweise kann Material des innen liegenden Deckbleches eines Verbundbleches im Übergangsbereich von Halteabschnitt zu Biegeabschnitt von der Ausnehmung aufgenommen und eine Delamination in diesem Bereich zwischen innen liegendem Deckblech und Kunststoffschicht und/oder zwischen Kunststoffschicht und außen liegendem Deckblech und Kunststoffschicht bewirkt werden. Dadurch kann das Risiko einer Rissbildung im außen liegenden Deckblech beim Falzen von Verbundblechen verringert werden.The bending edge of the die is provided with a recess extending along the bending edge. During bending, it comes inevitably to the inside of the sheet to a compressive load and on the outside of the sheet to a corresponding tensile load. In the recess material of the sheet can be added and thus the compressive and tensile loads are reduced. The risk of cracking on the outside can therefore be further reduced. For example, material of the inner cover plate of a composite metal sheet can be received in the transition region from the holding section to the bending section of the recess and a delamination in this area between the inner cover plate and plastic layer and / or between plastic layer and outer cover plate and plastic layer can be effected. This may increase the risk of cracking the outside lying cover plate can be reduced when folding composite sheets.

Weiter ausgestalten lässt sich die Biegevorrichtung dadurch, dass die Biegekante der Matrize auswechselbar ist. Die Biegevorrichtung kann somit einfach an unterschiedliche Biegeradien und unterschiedliche Biegewinkel angepasst werden. Ebenfalls können auf diese Weise sowohl Biegekanten mit einer entlang der Biegekante verlaufenden Ausnehmung als auch Biegekanten die keine solche Ausnehmung aufweisen, in derselben Biegevorrichtung verwendet werden.Next configured, the bending device can be characterized in that the bending edge of the die is interchangeable. The bending device can thus be easily adapted to different bending radii and different bending angles. Also in this way both bending edges with a recess running along the bending edge and bending edges which have no such recess can be used in the same bending device.

In Bezug auf die Verwendung wurde die oben genannte Aufgabe dadurch gelöst, dass das Biegeverfahren zur Herstellung eines Fahrzeugelements, insbesondere eines Stirnwandelementes und/oder Motorhaubenelementes verwendet wird.With regard to the use, the above-mentioned object has been achieved in that the bending method is used to produce a vehicle element, in particular an end wall element and / or hood element.

Im Weiteren soll die Erfindung anhand einer Zeichnung in Verbindung mit Ausführungsbeispielen näher erläutert werden. Die Zeichnung zeigt in:

Fig. 1
eine schematische Darstellung eines ersten Ausführungsbeispieles einer Vorrichtung die nicht unter den Schutzbereich der Ansprüche fällt in verschiedenen Positionen;
Fig. 2
eine schematische Darstellung eines zweiten Ausführungsbeispieles einer erfindungsgemäßen Vorrichtung in verschiedenen Positionen;
Fig. 3
ein Ausführungsbeispiel einer erfindungsgemäßen Verwendung des Biegeverfahrens;
Fig. 4
eine schematische Darstellung zur Veranschaulichung eines weiteren, optionalen Schrittes des Biegeverfahrens.
In addition, the invention will be explained in more detail with reference to a drawing in conjunction with exemplary embodiments. The drawing shows in:
Fig. 1
a schematic representation of a first embodiment of a device which does not fall under the scope of the claims in different positions;
Fig. 2
a schematic representation of a second embodiment of a device according to the invention in different positions;
Fig. 3
an embodiment of a use of the bending method according to the invention;
Fig. 4
a schematic representation for illustrating a further optional step of the bending process.

In der Fig. 1 ist ein Ausführungsbeispiel einer Biegevorrichtung mit einem Biegestempel 4 und einer Matrize 2 dargestellt. Der Biegestempel 4 weist ein Schwenkelement 3 mit einem Kontaktabschnitt 8 und einem starr mit dem Kontaktabschnitt 8 verbundenen Umformabschnitt 9 auf. In der Fig. 1a wird der Zustand der Biegevorrichtung zu Beginn des Biegevorgangs gezeigt. Ein Blech 6 wird mit seinem Halteabschnitt 5 von einem Niederhalter 10 so an der Matrize 2 gehalten, dass es mit seinem Biegeabschnitt 7 seitlich über die auswechselbare Biegekante 1 der Matrize 2 hinaus ragt. Bei dem gezeigten Blech 6 handelt es sich um ein Vollblech 6.In the Fig. 1 an embodiment of a bending device with a bending punch 4 and a die 2 is shown. The bending punch 4 has a pivoting element 3 with a contact section 8 and a forming section 9 rigidly connected to the contact section 8. In the Fig. 1a the state of the bending device is shown at the beginning of the bending process. A plate 6 is held with its holding portion 5 by a hold-down 10 on the die 2 that it projects laterally with its bending portion 7 on the interchangeable bending edge 1 of the die 2 addition. The sheet metal 6 shown is a solid sheet 6.

Durch Zusammenfahren der Matrize 2 und des Biegestempels 4 wird der Kontaktabschnitt 8 des Schwenkelementes 3 mit dem Halteabschnitt 5 des Bleches 6 in Kontakt gebracht und das Schwenkelement 3 verschwenkt. In Folge des Schwenkens des Schwenkelements 3 wird der Biegeabschnitt 7 des Bleches 6 um einen Biegewinkel α von 130° um die Biegekante 1 der Matrize 2 gebogen.By moving together the die 2 and the bending punch 4, the contact portion 8 of the pivot member 3 is brought into contact with the holding portion 5 of the sheet 6 and the pivot member 3 is pivoted. As a result of the pivoting of the pivoting element 3, the bending section 7 of the sheet 6 is bent by a bending angle α of 130 ° about the bending edge 1 of the die 2.

Das Schwenkelement 3 ist mit einer Schwenkachse 11 in dem Biegestempel 4 gelagert. Die Schwenkachse 11 ist dabei parallel zur Biegekante 1 ausgerichtet. Während des Schwenkens des Schwenkelements 3 kann sich die Schwenkachse 11 in dem Biegestempel 4 in Radialrichtung bewegen. Dabei wird das Schwenkelement 3 mit einem Führungselement 12 geführt, so dass der Kontaktabschnitt 8 des Schwenkelements 3 auf dem Halteabschnitt 5 des Bleches 6 abrollen kann. DieThe pivoting element 3 is mounted with a pivot axis 11 in the bending punch 4. The pivot axis 11 is aligned parallel to the bending edge 1. During pivoting of the pivoting element 3, the pivot axis 11 can move in the bending punch 4 in the radial direction. In this case, the pivoting element 3 is guided with a guide element 12, so that the contact portion 8 of the pivoting element 3 can roll on the holding portion 5 of the sheet 6. The

Oberfläche des Halteabschnittes 5 des Bleches 6 wird somit während des Biegens geschont. In dem gezeigten Ausführungsbeispiel ist das Führungselement 12, mit dem die Rotationsbewegung des Schwenkelementes 3 mit der Translationsbewegung der Schwenkachse 11 gekoppelt wird, als Anschlag ausgebildet, der mit der Außenkontur 14 des Schwenkelementes 3 zusammenwirkt. Grundsätzlich sind jedoch auch andere Arten der Kopplung beispielsweise über Zahnräder und Zahnstangen denkbar.Surface of the holding portion 5 of the sheet 6 is thus protected during bending. In the embodiment shown, the guide element 12, with which the rotational movement of the pivoting element 3 is coupled to the translational movement of the pivot axis 11, formed as a stop which cooperates with the outer contour 14 of the pivoting element 3. In principle, however, other types of coupling, for example via gears and racks are conceivable.

Die Schwenkachse 11 kann jedoch auch, wie gestrichelt in der Fig. 1a angedeutet, bezogen auf den Biegestempel 4 ortsfest angeordnet werden und somit eine Biegevorrichtung mit einer erhöhten Steifigkeit zur Verfügung gestellt werden.However, the pivot axis 11 can also, as dashed lines in the Fig. 1a indicated, relative to the bending punch 4 are arranged stationary and thus a bending device with an increased rigidity are provided.

Fig. 2 zeigt die gleiche Biegevorrichtung wie Fig. 1, bei der erfindungsgemäß die Matrize 2' allerdings eine Biegekante 1' mit einer entlang der Biegekante 1' verlaufenden Ausnehmung 14' aufweist. Der technische Effekt dieser Ausnehmung 14' beim Biegen wird anhand eines Verbundbleches 6' erläutert. Fig. 2 shows the same bending device as Fig. 1 in which according to the invention, however, the die 2 'has a bending edge 1' with a recess 14 'extending along the bending edge 1'. The technical effect of this recess 14 'during bending is explained with reference to a composite sheet 6'.

Die äußeren Deckbleche 16', 17' des Verbundbleches 6' sind aus einem Stahlblech mit einer Dicke von 400 µm gefertigt und über eine mittlere, aus einem viskoelastischen Kunststoff bestehende Schicht 18' von 25 µm miteinander verbunden.The outer cover plates 16 ', 17' of the composite sheet 6 'are made of a steel sheet having a thickness of 400 .mu.m and connected to each other via a middle, consisting of a viscoelastic plastic layer 18' of 25 microns.

Beim Biegen des Verbundbleches 6' kann Material vom inneren Deckblech 16' des Verbundbleches 6' in die Ausnehmung 14' fließen. Dadurch wird in dem Übergangsbereich von Halteabschnitt 5' und Biegeabschnitt 7' eine Delamination bewirkt. Mit anderen Worten wird das innere Deckblech 16' von der Kunststoffschicht 18', über die es mit dem äußeren Deckblech 17' verbunden war, getrennt. Infolge der Materialverdrängung in die Ausnehmung 14' hinein, reduziert sich die Zugbelastung auf das äußere Deckblech 17', so dass das Risiko des Auftretens von Rissen im äußeren Deckblech 17' nach dem Biegen reduziert ist. Dies ist insbesondere dann von Bedeutung, wenn das Verbundblech 6' im Anschluss gefalzt wird.When bending the composite sheet 6 'material from the inner cover plate 16' of the composite sheet 6 'in the recess 14' flow. As a result, a delamination is effected in the transition region of holding section 5 'and bending section 7'. In other words, the inner cover plate 16 'of the plastic layer 18', over which it with the outer Cover plate 17 'was connected, separated. As a result of the material displacement into the recess 14 ', the tensile load on the outer cover plate 17' is reduced, so that the risk of occurrence of cracks in the outer cover plate 17 'is reduced after bending. This is particularly important when the composite sheet 6 'is folded in the connection.

Eine erfindungsgemäße Verwendung des beanspruchten Biegeverfahrens wird in der Fig. 3 veranschaulicht. Diese zeigt einen Ausschnitt eines Fahrzeugelements 15" in Form einer Motorhaube. Diese weist ein Verbundblech 6" und ein Strukturelement 19'' auf. Der Biegeabschnitt 7'' des Verbundbleches 6'' wurde zunächst entsprechend der in Fig. 2 gezeigten Vorgehensweise um einen Biegewinkel von mehr als 90° gebogen und das innere Deckblech 16'' durch Delamination im Übergangsbereich von Halteabschnitt 5'' und Biegeabschnitt 7'' von der Kunststoffschicht 18'' getrennt. Im gebildeten spitzen Winkel des Verbundbleches 6" wurde sodann ein Strukturelement 19'' angeordnet und im Anschluss durch Falzen des Verbundbleches 6" dieses fest mit dem Strukturelement 19'' verbunden. Das äußere Deckblech 17'' weist auch nach der 180°-Falzung keine Risse auf.A use according to the invention of the claimed bending method is described in the Fig. 3 illustrated. This shows a detail of a vehicle element 15 "in the form of a bonnet, which has a composite sheet 6" and a structural element 19 ". The bending section 7 '' of the composite sheet 6 '' was first according to the in Fig. 2 shown bent by a bending angle of more than 90 ° and the inner cover plate 16 '' by delamination in the transition region of holding section 5 '' and bending section 7 '' separated from the plastic layer 18 ''. In the formed acute angle of the composite sheet 6 "was then a structural element 19 '' arranged and connected by folding the composite sheet 6" this fixed to the structural element 19 ''. The outer cover plate 17 '' has no cracks even after the 180 ° fold.

In der Fig. 4 wird eine Vorrichtung gezeigt, die das Zurückbiegen eines mit beispielsweise der in der Fig. 1 gezeigten Biegevorrichtung um einen Biegewinkel α''' gebogenen Biegeabschnitt 7''' eines Bleches 6''' um einen Biegewinkel β''' ermöglicht. Dabei handelt es sich im vorliegenden Fall um ein Verbundblech 6'''. Die Vorrichtung weist dazu einen Rahmen 20''' auf, mit dem der Winkel β''' vorgegeben wird, um den der Biegeabschnitt 7''' des Bleches 6''' zurückgebogen werden soll. Der Rahmen 20''' dient dabei gleichzeitig dazu das Blech 6''' am Maschinentisch 21''' zu halten. Grundsätzlich ist es allerdings auch möglich, für diese beiden Funktionen jeweils ein eigenes Vorrichtungselement vorzusehen. Weiter ist ein Stempel 22''' vorgesehen, mit dem die für das Biegen benötigte Kraft in das Blech 6''' eingeleitet wird. Der Stempel 22''' wird dabei entweder hydraulisch oder pneumatisch angetrieben. Ebenso ist es allerdings denkbar einen Elektromotor, z.B. beispielsweise einen Linearmotor, für diesen Zweck vorzusehen.In the Fig. 4 a device is shown, the bending back one with, for example, in the Fig. 1 Bender shown by a bending angle α '''bent bending portion 7''' of a sheet 6 '''by a bending angle β''' allows. These are in the present case a composite sheet 6 '''. The device has for this purpose a frame 20 ''', with which the angle β''' is given to the bending portion 7 '''of the sheet 6 '''to be bent back. The frame 20 '''serves at the same time to hold the sheet 6''' on the machine table 21 '''. In principle, however, it is also possible to provide for each of these two functions a separate device element. Further, a punch 22 '''is provided, with which the force required for bending in the sheet 6''' is initiated. The punch 22 '''is driven either hydraulically or pneumatically. However, it is also conceivable to provide an electric motor, for example a linear motor, for this purpose.

Durch das Zurückbiegen um den Biegewinkel β''' werden die aus dem Biegen folgenden Spannungen zwischen dem innen liegenden Deckblech 16''' und dem außen liegenden Deckblech 17''' kompensiert. Das so bearbeitete Blech 6''' zeichnet sich somit durch eine deutlich geringere Neigung zur zeitverzögerten Delamination im Biegebereich aus.By bending back to the bending angle β '' 'following the bending of the following stresses between the inner cover plate 16' '' and the outer cover plate 17 '' 'are compensated. The thus processed sheet 6 '' 'is thus characterized by a much lower tendency for delayed delamination in the bending area.

Claims (16)

  1. A bending method, in which through the closing of a die (2, 2') comprising a bending edge (1, 1') and a bending punch (4, 4') comprising a pivot element (3, 3'), the pivot element (3, 3') is brought into contact with a holding section (5, 5', 5'') of a sheet (6, 6', 6'', 6''') arranged between the die (2, 2') and the bending punch (4, 4'), the pivot element (3, 3') is pivoted through the contact with the holding section (5, 5', 5'') of the sheet (6, 6', 6'', 6''') and through the pivoting of the pivot element (3, 3') a bending section (7, 7', 7'', 7''') of the sheet (6, 6', 6'', 6''') is bent about the bending edge (1, 1') of the die (2, 2'), wherein the die (2, 2') comprises a bending edge (1, 1') with a recess (14') running along the bending edge (1, 1').
  2. The bending method according to Claim 1,
    characterized in that
    a contact section (8) of the pivot element (3, 3') is brought in contact with the holding section (5, 5', 5'') of the sheet (6, 6', 6'', 6''') and through the pivoting of the pivot element (3, 3') with a forming section (9) of the pivot element (3, 3') a force is exerted on the bending section (7, 7', 7'', 7''') of the sheet (6, 6', 6'', 6'''), which comprises a component that is located angled to the bending edge (1, 1') in the plane of the holding section (5, 5' , 5'').
  3. The bending method according to any one of the Claims 1 or 2,
    characterized in that
    the contact section (8) of the pivot element (3, 3') during the bending is rolled off on the holding section (5, 5', 5''') of the sheet (6, 6', 6'', 6''').
  4. The bending method according to any one of the Claims 1 to 3,
    characterized in that
    the sheet (6, 6', 6'', 6''') during the bending is held on the die (2, 2') by a hold-down (10) during the bending.
  5. The bending method according to any one of the Claims 1 to 4,
    characterized in that
    the bending section (7, 7', 7'', 7''') of the sheet (6, 6', 6'', 6''') is bent about the bending edge (1, 1') of the die (2, 2') by a bending angle (α, α''') of more than 90°, more than 105°, more than 120°, up to 135°.
  6. The bending method according to any one of the Claims 1 to 5,
    characterized in that
    a composite sheet, a full sheet (6, 6', 6'', 6''') or a lightweight sheet is bent.
  7. The bending method according to any one of the Claims 1 to 6,
    characterized in that
    after the bending of the bending section (7, 7', 7'', 7''') of the sheet (6, 6', 6", 6''') about a first bending angle (α, α''') the bending section (7, 7', 7'', 7''') of the sheet (6, 6', 6'', 6''') is bent back by a second bending angle (β''').
  8. The bending method according to any one of the Claims 1 to 7,
    characterized in that
    the sheet (6, 6', 6'', 6''') is folded.
  9. A bending device for carrying out a method according to any one of the Claims 1 to 8, with a bending punch (4, 4') and a die (2, 2') comprising a bending edge (1, 1'),
    characterized in that
    the bending punch (4, 4') comprises a pivotably mounted pivot element (3, 3') with a contact section (8) and a forming section (9), in that the pivot element (3, 3') is pivotable through contact of the contact section (8) with a holding section (5, 5', 5'') of a sheet (6, 6', 6'', 6''') to be bent, in that through the pivoting the forming section (9) can exert a force on the bending section (7, 7', 7'', 7''') of the sheet (6, 6', 6'', 6'''), which comprises a component located angled to the bending edge (1, 1') in the plane of the holding section (5, 5', 5''), the bending section (7, 7', 7'', 7''') of the sheet (6, 6', 6'', 6''') to be bent is bendable about the bending edge (1, 1') of the die (2, 2'), wherein the die (2, 2') has a bending edge (1, 1') with a recess (14') running along the bending edge (1, 1').
  10. The bending device according to Claim 9,
    characterized in that
    the contact section (8) and the forming section (9) of the pivot element (3, 3') are rigidly connected to one another.
  11. The bending device according to any one of the Claims 9 or 10,
    characterized in that
    the pivot element (3, 3') is mounted with a pivot axis (11) in the bending punch (4, 4').
  12. The bending device according to any one of the Claims 9 to 11,
    characterized in that
    by the pivot axis (11) being moveable in the bending punch (4, 4') in radial direction and the pivot element (3, 3') being guidable by a guide element (12), in particular on its outer contour (13), the contact section (8) of the pivot element (3, 3') can roll off the sheet (6, 6', 6'', 6''') to be bent.
  13. The bending device according to any one of the Claims 9 to 12,
    characterized in that
    the pivot axis (11) is orientated parallel to the bending edge (1, 1').
  14. The bending device according to any one of the Claims 9 to 13,
    characterized in that
    the bending device comprises a hold-down (10).
  15. The bending device according to any one of the Claims 9 to 14,
    characterized in that
    the bending edge (1, 1') of the die (2, 2') is exchangeable.
  16. Use of a bending method according to any one of the Claims 1 to 8 for producing a vehicle element (15"), in particular of a front wall element and/or an engine hood element.
EP11718357.4A 2010-05-12 2011-05-04 Bending method and bending apparatus Active EP2569108B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL11718357T PL2569108T3 (en) 2010-05-12 2011-05-04 Bending method and bending apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010016914A DE102010016914A1 (en) 2010-05-12 2010-05-12 Bending method and bending device
PCT/EP2011/057155 WO2011141339A1 (en) 2010-05-12 2011-05-04 Bending method and bending device

Publications (2)

Publication Number Publication Date
EP2569108A1 EP2569108A1 (en) 2013-03-20
EP2569108B1 true EP2569108B1 (en) 2014-03-12

Family

ID=44275959

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Application Number Title Priority Date Filing Date
EP11718357.4A Active EP2569108B1 (en) 2010-05-12 2011-05-04 Bending method and bending apparatus

Country Status (6)

Country Link
EP (1) EP2569108B1 (en)
DE (1) DE102010016914A1 (en)
ES (1) ES2467146T3 (en)
PL (1) PL2569108T3 (en)
PT (1) PT2569108E (en)
WO (1) WO2011141339A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2985441A1 (en) * 2012-01-09 2013-07-12 Peugeot Citroen Automobiles Sa Eccentric system for use in working machine to fold sheet used for manufacturing structural element of vehicle, has cam whose exterior profile drives tool in radial translation toward outside to fold lateral portion of sheet
DE102012103543A1 (en) 2012-04-23 2013-10-24 Thyssenkrupp Steel Europe Ag Method for bending edge of composite metal sheet used for e.g. bonnet of motor car, involves setting width of the spacing between the bending jaws and blank holder smaller than the total thickness of the composite metal sheet
KR20150004349A (en) 2012-04-23 2015-01-12 티센크루프 스틸 유럽 악티엔게젤샤프트 Method for bending a composite sheet and such a bent composite sheet
DE102012106420A1 (en) 2012-07-17 2014-01-23 Thyssenkrupp Steel Europe Ag Method for bending edge of composite sheet, particularly part of motor vehicle, involves folding edge of composite sheet, where sheet is bent in another step, and folding punch, holding down clamp and folding jaw are used during folding
DE102013108702B4 (en) * 2013-08-12 2015-02-19 Thyssenkrupp Steel Europe Ag Method for connecting a sandwich panel to a metallic component and body part with a sandwich panel as outer panel and a metallic component
JP2020093304A (en) * 2014-04-01 2020-06-18 株式会社アマダ Press brake mold and hemming processing method
CN104722613B (en) * 2015-03-13 2017-06-06 江门市南洋船舶工程有限公司 Knuckle processing unit (plant) for making ship cable bracket
DE102020214784A1 (en) 2020-11-25 2022-05-25 Volkswagen Aktiengesellschaft Process and device for forming a component

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4365500A (en) * 1981-01-30 1982-12-28 Chesley F. Carlson Company Web bending fixture
JPS59197318A (en) * 1983-04-21 1984-11-08 Daihatsu Motor Co Ltd Die for press
DE3739173A1 (en) * 1987-11-19 1989-06-01 Feintool Int Holding METHOD AND DEVICE FOR BENDING WORKPIECES
JPH01138020A (en) * 1987-11-24 1989-05-30 Kyowa Mach Kk Pressing device for bending sheet metal
JPH01143722A (en) * 1987-11-30 1989-06-06 Maru Kikai Kogyo Kk Folding die
JPH05305342A (en) * 1992-04-24 1993-11-19 Anritsu Corp Die unit for press
US5361620A (en) * 1993-07-02 1994-11-08 Meadows John L Method and apparatus for hemming sheets of metal material
DE10111134C1 (en) * 2001-03-08 2002-07-04 Bayerische Motoren Werke Ag Assembly, for folding edge of metal sheet, involves clamping edge zone between upper and lower dies in press where the closing movement of press swings a shaping edge to bend the sheet along the folding line without distortion
DE10223637B4 (en) 2002-05-28 2007-11-08 Pass Stanztechnik Ag Bending tool

Also Published As

Publication number Publication date
DE102010016914A9 (en) 2012-04-19
EP2569108A1 (en) 2013-03-20
PT2569108E (en) 2014-06-09
ES2467146T3 (en) 2014-06-12
PL2569108T3 (en) 2014-08-29
WO2011141339A1 (en) 2011-11-17
DE102010016914A1 (en) 2011-11-17

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