EP1097758B1 - Method for forming a large metal sheet, especially a vehicle body part - Google Patents

Method for forming a large metal sheet, especially a vehicle body part Download PDF

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Publication number
EP1097758B1
EP1097758B1 EP00119880A EP00119880A EP1097758B1 EP 1097758 B1 EP1097758 B1 EP 1097758B1 EP 00119880 A EP00119880 A EP 00119880A EP 00119880 A EP00119880 A EP 00119880A EP 1097758 B1 EP1097758 B1 EP 1097758B1
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EP
European Patent Office
Prior art keywords
stretched
shape
die
deep
tool
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Expired - Lifetime
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EP00119880A
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German (de)
French (fr)
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EP1097758A2 (en
EP1097758A3 (en
Inventor
Rolf Heyll
Robert Koehr
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Dr Ing HCF Porsche AG
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Dr Ing HCF Porsche AG
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Publication of EP1097758A3 publication Critical patent/EP1097758A3/en
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Classifications

    • 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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/021—Deforming sheet bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure

Definitions

  • the invention relates to a method for producing a large sheet metal part, in particular a body component for a vehicle from a flat circuit board according to Preamble of Claim 1. Such a method is known from the DE 19717953 A known.
  • Deep drawing takes place in hydraulic or mechanical Drawing presses instead.
  • a flat, trimmed sheet metal part, the board is in a conventional forming tool is inserted and stretched and compressed into one Formed hollow body.
  • large sheet metal parts manufactured in this way shown that they are particularly in the case of slight curvature in a central area of their Area extension are relatively soft and have only a low buckling stiffness there.
  • Hydromechanical deep drawing (Hydromec process) is also used to manufacture sheet metal parts. known. With these processes, no die is required, rather the press Pull the clamped board into a one filled with an active medium (water) Vessel that replaces the die. The water pressure causes the sheet to form of the drawing die.
  • the clamped Blank pre-stretched before the actual shaping process to a to achieve increased ironing and thus increased strengthening in the middle of the sinker.
  • the object of the invention is a method for producing a large area To create sheet metal part from a flat board, which with increased buckling stiffness in the Short cycle times of the sheet metal part enabled in the middle of the board.
  • the main advantages achieved with the invention are the fact that by combining two known processes for the first time, namely the stretching of one First, level the circuit board using the active medium to achieve strain hardening in the middle of the board and the conventional pressing (deep drawing) of sheet metal parts Advantages of both processes - optimized component behavior and high process effectiveness - come to fruition.
  • the pre-stretched sheets can be produced on systems with relatively low clamping forces as the maximum pressures required are approx. 15 bar. Even mechanical Presses can be used.
  • the well-known hydromechanical Finished molds require high pressures, which in turn lead to high press clamping forces lead are not necessary in the method according to the invention, since the final molding done here conventionally. Because the stretching in contrast to the hydromechanical Finished molds take up little time, the cycle time at The inventive method significantly reduced.
  • pre-stretched sheets are in a linked press line as first operation imaginable.
  • the semi-finished product Pre-stretched blanks (comparable to tailored blanks) at the press shop to be delivered.
  • tailored blanks are also for further weight reduction conceivable.
  • a solidification e.g. in the area of the thinner sheet local increase in buckling stiffness can be used (example Base plate / tunnel / bottom plate).
  • Pre-stretched boards can also be found in soft tools commonly used in prototype manufacturing Find use, be used. So far it was not possible because of the high Occurring pressures of hydromechanically manufactured parts using so-called soft tools reshape.
  • the method according to the invention can increase component rigidity again a clear weight reduction potential through the use of thinner Sheet metal offers can be achieved without the previous disadvantages of hydromechanical shaped sheets - very high process cycle time and high system costs - in purchase to have to take. It can be the conventional sheet metal forming processes achieve comparable cycle times. A separate production of the preformed blanks e.g. can be carried out at the semi-finished product manufacturer. So it is also a commitment for Prototype components possible with almost no cost.
  • a body part For a vehicle first cut or punch a plane Board 2 created. This board 2 is then inserted into a forming tool 3, which consists of a fixed lower part 4 and an upper movable die 5 composed. Connected to the die 5 are spaced apart Hold-down device 6 which, when the forming tool 3 is closed, against the top of the Press board 2 and thus position it correctly in the forming tool 3.
  • a forming tool 3 which consists of a fixed lower part 4 and an upper movable die 5 composed.
  • Hold-down device 6 Connected to the die 5 are spaced apart Hold-down device 6 which, when the forming tool 3 is closed, against the top of the Press board 2 and thus position it correctly in the forming tool 3.
  • the cavity 7 there is a cavity 7 in the lower part 4 adjacent to the circuit board 2 provided for an active medium 8.
  • the cavity 7 has an inlet or outlet 9 provided for the active medium 8.
  • a liquid is preferably used as the active medium 8 (Water, oil or the like) is used.
  • the active medium 8 could also be pneumatic be trained (e.g. air).
  • the die 5 has a profiled on its underside Shape up.
  • the pre-stretched, profiled Preform 10 removed from the forming tool and into a conventional one multi-part deep-drawing tool 11 inserted and there in a deep-drawing process in the Formed end shape 12.
  • the deep drawing tool 11 comprises a fixed lower part 13 with an insert 14 which determines the final shape 12, a movable upper part 15 and Hold-down device 16.
  • the circuit board 2 can have one over the entire area have constant wall thickness; however, the board 2 can also be used as a tailored blanks component be trained.

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

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines großflächigen Blechteiles, insbesondere eines Karosseriebauteiles für ein Fahrzeug aus einer ebenen Platine gemäß Oberbegriff des Anspruchs 1. Ein solches Verfahren is aus der DE 19717953 A bekannt.The invention relates to a method for producing a large sheet metal part, in particular a body component for a vehicle from a flat circuit board according to Preamble of Claim 1. Such a method is known from the DE 19717953 A known.

Die Herstellung von großflächigen Karosseriebauteilen wie Fahrzeugdächern, Türaußenblechen, Seitenteilen, Deckelaußenblechen oder dgl. erfolgt herkömmlicher Weise durch Tiefziehen. Das Tiefziehen findet in hydraulischen oder mechanischen Ziehpressen statt. Beim Tiefziehen wird ein ebenes beschnittenes Blechteil, die Platine, in ein herkömmliches Umformwerkzeug eingelegt und durch Dehnen und Stauchen in einen Hohlkörper umgeformt. Bei derartig gefertigten großflächigen Blechteilen hat sich gezeigt, daß sie insbesondere bei geringer Wölbung in einem mittleren Bereich ihrer Flächenerstreckung relativ weich sind und dort nur eine geringe Beulsteifigkeit aufweisen.The production of large-area body components such as vehicle roofs, Door outer panels, side panels, cover outer panels or the like is more conventional Way by deep drawing. Deep drawing takes place in hydraulic or mechanical Drawing presses instead. During deep drawing, a flat, trimmed sheet metal part, the board, is in a conventional forming tool is inserted and stretched and compressed into one Formed hollow body. In large sheet metal parts manufactured in this way, shown that they are particularly in the case of slight curvature in a central area of their Area extension are relatively soft and have only a low buckling stiffness there.

Ferner ist zur Herstellung von Blechteilen das hydromechanische Tiefziehen (Hydromec-Verfahren) bekannt. Bei diesen Verfahren ist kein Gesenk erforderlich, vielmehr drückt der Ziehstempel die eingespannte Platine in ein mit einem Wirkmedium (Wasser) gefülltes Gefäß, daß das Gesenk ersetzt. Der Wasserdruck bewirkt, daß sich das Blech der Form des Ziehstempels anpaßt. Bei einer Variante dieses Verfahrens wird die eingespannte Platine vor dem eigentlichen formgebenden Umformprozeß frei vorgereckt, um eine erhöhte Abstreckung und damit eine erhöhte Verfestigung in der Platinenmitte zu erzielen. Für diesen Prozeß sind bislang aufwendige und damit teure Maschinen notwendig und es entstehen im Vergleich zum Tiefziehen große Zykluszeiten.Hydromechanical deep drawing (Hydromec process) is also used to manufacture sheet metal parts. known. With these processes, no die is required, rather the press Pull the clamped board into a one filled with an active medium (water) Vessel that replaces the die. The water pressure causes the sheet to form of the drawing die. In a variant of this method, the clamped Blank pre-stretched before the actual shaping process to a to achieve increased ironing and thus increased strengthening in the middle of the sinker. Up to now, complex and thus expensive machines have been necessary for this process and it Compared to deep drawing, there are long cycle times.

Aufgabe der Erfindung ist es, ein Verfahren zur Herstellung eines großflächigen Blechteiles aus einer ebenen Platine zu schaffen, das bei erhöhter Beulsteifigkeit in der Platinenmitte geringe Zykluszeiten des Blechteils ermöglicht. The object of the invention is a method for producing a large area To create sheet metal part from a flat board, which with increased buckling stiffness in the Short cycle times of the sheet metal part enabled in the middle of the board.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Anspruchs 1 gelöst. Weitere, die Erfindung in vorteilhafter Weise ausgestaltende Merkmale enthalten die Unteransprüche.According to the invention, this object is achieved by the features of claim 1. Further features which advantageously configure the invention include the Dependent claims.

Die mit der Erfindung hauptsächlich erzielten Vorteile sind darin zu sehen, daß durch das erstmalige Kombinieren von zwei bekannten Prozessen, nämlich das Vorrecken einer zunächst ebenen Platine mittels Wirkmedium zur Erzielung einer Kaltverfestigung speziell in der Platinenmitte und das herkömmliche Pressen (Tiefziehen) von Blechteilen, die Vorteile beider Prozesse - optimiertes Bauteilverhalten und hohe Prozesseffektivität - zum Tragen kommen.The main advantages achieved with the invention are the fact that by combining two known processes for the first time, namely the stretching of one First, level the circuit board using the active medium to achieve strain hardening in the middle of the board and the conventional pressing (deep drawing) of sheet metal parts Advantages of both processes - optimized component behavior and high process effectiveness - come to fruition.

Die vorgereckten Bleche können auf Anlagen mit relativ kleinen Schließkräften hergestellt werden, da die maximal benötigten Drucke ca. 15 bar betragen. Auch mechanische Pressen können zum Einsatz kommen. Die beim bekannten hydromechanischen Fertigformen erforderlichen hohen Drucke, die wiederum zu hohen Pressenschließkräften führen, sind beim erfindungsgemäßen Verfahren nicht erforderlich, da das Fertigformen hier konventionell erfolgt. Da das Vorrecken im Gegensatz zum hydromechanischen Fertigformen nur wenig Zeit in Anspruch nimmt, wird die Zykluszeit beim erfindungsgemäßen Verfahren erheblich reduziert.The pre-stretched sheets can be produced on systems with relatively low clamping forces as the maximum pressures required are approx. 15 bar. Even mechanical Presses can be used. The well-known hydromechanical Finished molds require high pressures, which in turn lead to high press clamping forces lead are not necessary in the method according to the invention, since the final molding done here conventionally. Because the stretching in contrast to the hydromechanical Finished molds take up little time, the cycle time at The inventive method significantly reduced.

Das Herstellen von vorgereckten Blechen ist in einer verketteten Pressenstrasse als erste Operation vorstellbar. Darüberhinaus ist es denkbar, daß vom Halbzeughersteller bereits vorgereckte Platinen (vergleichbar mit Tailored Blanks) beim Presswerk angeliefert werden.The production of pre-stretched sheets is in a linked press line as first operation imaginable. In addition, it is conceivable that the semi-finished product Pre-stretched blanks (comparable to tailored blanks) at the press shop to be delivered.

Die Verwendung von Tailored Blanks ist zur weiteren Gewichtsreduzierung ebenfalls denkbar. Hier kann eine Verfestigung speziell z.B. im Bereich des dünneren Bleches zur lokalen Erhöhung der Beulsteifigkeit genutzt werden (Beispiel Bodenblech/Tunnel/Bodenblech). The use of tailored blanks is also for further weight reduction conceivable. Here, a solidification, e.g. in the area of the thinner sheet local increase in buckling stiffness can be used (example Base plate / tunnel / bottom plate).

Vorgereckte Platinen können auch in Softtools, die gemeinhin bei der Prototypherstellung Verwendung finden, eingesetzt werden. Bislang war es nicht möglich wegen der hohen auftretenden Drücke hydromechanisch hergestellte Teile mittels sog. Softtools umzuformen.Pre-stretched boards can also be found in soft tools commonly used in prototype manufacturing Find use, be used. So far it was not possible because of the high Occurring pressures of hydromechanically manufactured parts using so-called soft tools reshape.

Als Bauteile kommen alle Außenhautteile in Betracht, zusätzlich erscheint bei allen flächigen Bauteilen, die gemeinhin aus relativ dünnen Blechen hergestellt werden, der Einsatz der oben beschriebenen Verfahrenskombination sinnvoll.All outer skin parts come into consideration as components, and additionally appears for all flat components, which are commonly made of relatively thin sheets, the Use of the combination of methods described above makes sense.

Durch das erfindungsgemäße Verfahren kann eine erhöhte Bauteilsteifigkeit, die wiederum ein deutliches Gewichtsreduzierungspotential durch den Einsatz dünnerer Bleche bietet, erzielt werden ohne die bisherigen Nachteile von hydromechanisch geformten Blechen - sehr hohe Prozesszykluszeit und hohe Anlagenkosten - in Kauf nehmen zu müssen. Es lassen sich den herkömmlichen Blechumformprozessen vergleichbare Taktzeiten erzielen. Eine separate Herstellung der vorgeformten Platinen z.B. beim Halbzeughersteller kann durchgeführt werden. Somit ist auch ein Einsatz für Prototypbauteile nahezu kostenneutral möglich.The method according to the invention can increase component rigidity again a clear weight reduction potential through the use of thinner Sheet metal offers can be achieved without the previous disadvantages of hydromechanical shaped sheets - very high process cycle time and high system costs - in purchase to have to take. It can be the conventional sheet metal forming processes achieve comparable cycle times. A separate production of the preformed blanks e.g. can be carried out at the semi-finished product manufacturer. So it is also a commitment for Prototype components possible with almost no cost.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird in der Beschreibung näher erläutert. Es zeigen

Fig. 1A
ein offenes Umformwerkzeug mit eingelegter ebener Platine, wobei die Matritze eine profilierte Form aufweist.
Fig. 1 B
das geschlossene Umformwerkzeug mit vorgereckter Platine
Fig. 1C
das entnommene vorgereckte Blechteil
Fig. 1D
das in ein herkömmliches Tiefziehwerkzeug eingelegte und bereits in eine Endform umgeformtes Blechteil
Fig. 2A
ein offenes Umformwerkzeug mit eingelegter ebener Platine, wobei die Matritze eine ebene Form aufweist
Fig. 2B
das geschlossene Umformwerkzeug mit vorgereckter Platine
Fig. 2C
das entnommene vorgereckte Blechteil
Fig. 2D
das in ein herkömmliches Tiefziehwerkzeug eingelegte und bereits in eine Endform umgeformte Blechteil.
An embodiment of the invention is shown in the drawings and is explained in more detail in the description. Show it
Fig. 1A
an open forming tool with an inserted flat board, the die having a profiled shape.
Fig. 1B
the closed forming tool with pre-stretched blank
1C
the removed pre-stretched sheet metal part
Figure 1D
the sheet metal part inserted into a conventional deep-drawing tool and already formed into a final shape
Figure 2A
an open forming tool with an inserted flat board, the die having a flat shape
Figure 2B
the closed forming tool with pre-stretched blank
Figure 2C
the removed pre-stretched sheet metal part
Figure 2D
the sheet metal part inserted into a conventional deep-drawing tool and already formed into a final shape.

Zur Herstellung eines großflächigen Blechteiles 1, insbesondere eines Karosseriebauteiles für ein Fahrzeug, wird zunächst durch Beschneiden oder Ausstanzen eine ebene Platine 2 geschaffen. Diese Platine 2 wird danach in ein Umformwerkzeug 3 eingelegt, das sich aus einen feststehenden Unterteil 4 und einer oberen beweglichen Matritze 5 zusammensetzt. Mit der Matritze 5 verbunden sind beabstandet angeordnete Niederhalter 6, die bei geschlossenem Umformwerkzeug 3 gegen die Oberseite der Platine 2 drücken und diese somit im Umformwerkzeug 3 lagerichtig positionieren.For the production of a large-area sheet metal part 1, in particular a body part For a vehicle, first cut or punch a plane Board 2 created. This board 2 is then inserted into a forming tool 3, which consists of a fixed lower part 4 and an upper movable die 5 composed. Connected to the die 5 are spaced apart Hold-down device 6 which, when the forming tool 3 is closed, against the top of the Press board 2 and thus position it correctly in the forming tool 3.

Wie aus Fig. 1A ersichtlich, ist im Unterteil 4 angrenzend an die Platine 2 ein Hohlraum 7 für ein Wirkmedium 8 vorgesehen. Der Hohlraum 7 ist mit einer eine Zu- bzw. Ableitung 9 für das Wirkmedium 8 versehen. Als Wirkmedium 8 wird vorzugsweise eine Flüssigkeit (Wasser, Öl oder dgl.) verwendet. Ferner könnte das Wirkmedium 8 auch pneumatisch ausgebildet sein (z.B. Luft).As can be seen from FIG. 1A, there is a cavity 7 in the lower part 4 adjacent to the circuit board 2 provided for an active medium 8. The cavity 7 has an inlet or outlet 9 provided for the active medium 8. A liquid is preferably used as the active medium 8 (Water, oil or the like) is used. Furthermore, the active medium 8 could also be pneumatic be trained (e.g. air).

Bei geschlossenem Umformwerkzeug 3 und eingelegter Platine 2 wird durch einseitige Beaufschlagung der Platine 2 durch das Wirkmedium 8 ein Druck pi aufgebaut, wodurch die ebene Platine 2 quasi durch Innenhochdruckumformen in eine vorgereckte Vorform 10 gebracht wird. Gemäß Fig. 1B weist die Matritze 5 an ihrer Unterseite eine profilierte Form auf. Nach dem Öffnen des Umformwerkzeuges 3 wird die vorgereckte, profilierte Vorform 10 aus dem Umformwerkzeug entnommen und in ein herkömmliches mehrteiliges Tiefziehwerkzeug 11 eingelegt und dort in einem Tiefziehprozess in die Endform 12 umgeformt. Das Tiefzeihwerkzeug 11 umfaßt ein feststehendes Untereil 13 mit einem die Endform 12 bestimmten Einsatz 14, ein bewegliches Oberteil 15 und Niederhalter 16. Die Platine 2 kann über die gesamte Flächenerstreckung eine gleichbleibende Wanddicke aufweisen; die Platine 2 kann jedoch auch als Tailored Blanks-Bauteil ausgebildet sein.When the forming tool 3 is closed and the circuit board 2 is inserted, one-sided Actuation of the circuit board 2 by the active medium 8 builds up a pressure pi, as a result the flat board 2 quasi by internal high pressure forming into a pre-stretched preform 10 is brought. 1B, the die 5 has a profiled on its underside Shape up. After opening the forming tool 3, the pre-stretched, profiled Preform 10 removed from the forming tool and into a conventional one multi-part deep-drawing tool 11 inserted and there in a deep-drawing process in the Formed end shape 12. The deep drawing tool 11 comprises a fixed lower part 13 with an insert 14 which determines the final shape 12, a movable upper part 15 and Hold-down device 16. The circuit board 2 can have one over the entire area have constant wall thickness; however, the board 2 can also be used as a tailored blanks component be trained.

Die Ausführungsform gemäß den Fig. 2A bis 2B unterscheidet sich von der ersten Ausführungsform lediglich dadurch, daß gemäß Fig. 2B die horizontale Unterseite der Matritze 5 glattflächig ausgebildet ist. Beim Beaufschlagen mit dem Wirkmedium nimmt hier die Platine 2 gemäß Fig. 2B eine nach oben gewölbte Vorform 10 ein. Anschließend wird diese Vorform 10 im Tiefziehwerkzeug 11 in die Endform 12 umgeformt.2A to 2B differs from the first Embodiment only in that the horizontal underside of the Die 5 is smooth surface. When the active medium is applied here the plate 2 according to FIG. 2B an upwardly curved preform 10. Subsequently this preform 10 is formed into the final shape 12 in the deep-drawing tool 11.

Claims (6)

  1. A method of producing a sheet-metal part of large area, in particular a bodywork part for a vehicle, from a flat plate, wherein the flat plate (2) is put into a pre-stretched preliminary shape (10) by being acted upon on one side with an active medium (8) and after that is put into a final shape (12) by deep-drawing, characterized in that the production of the pre-stretched preliminary shape (10) takes place in a shaping tool (3) at pressures below 15 bar and the subsequent final shaping takes place in a separate deep-drawing tool (11).
  2. A method according to Claim 1, characterized in that the production of the pre-stretched preliminary shape (10) represents a first operation on a linked press-working line.
  3. A method according to Claim 1, characterized in that the pre-stretched preliminary shape (10) is supplied by a semifinished-product manufacturer.
  4. A method according to Claim 1, characterized in that the die (5) of the shaping tool (3) is formed with a smooth surface on its underside.
  5. A method according to Claim 1, characterized in that the die (5) of the shaping tool (3) has a profiled shape on its underside.
  6. A method according to Claim 1, characterized in that the flat plate (2) is designed in the form of a tailored-blanks component.
EP00119880A 1999-11-05 2000-09-13 Method for forming a large metal sheet, especially a vehicle body part Expired - Lifetime EP1097758B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19953522A DE19953522A1 (en) 1999-11-05 1999-11-05 Method for producing a large sheet metal part, in particular a body component for a vehicle
DE19953522 1999-11-05

Publications (3)

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EP1097758A2 EP1097758A2 (en) 2001-05-09
EP1097758A3 EP1097758A3 (en) 2002-01-02
EP1097758B1 true EP1097758B1 (en) 2004-12-01

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US (1) US6675620B1 (en)
EP (1) EP1097758B1 (en)
JP (1) JP2001162330A (en)
KR (1) KR20010051446A (en)
DE (2) DE19953522A1 (en)
ES (1) ES2228374T3 (en)

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KR20010051446A (en) 2001-06-25
EP1097758A2 (en) 2001-05-09
DE50008822D1 (en) 2005-01-05
EP1097758A3 (en) 2002-01-02
ES2228374T3 (en) 2005-04-16
JP2001162330A (en) 2001-06-19
DE19953522A1 (en) 2001-05-17
US6675620B1 (en) 2004-01-13

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