EP0668155A1 - Process and apparatus for the manufacture of deep drawn aluminium products - Google Patents

Process and apparatus for the manufacture of deep drawn aluminium products Download PDF

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Publication number
EP0668155A1
EP0668155A1 EP94102540A EP94102540A EP0668155A1 EP 0668155 A1 EP0668155 A1 EP 0668155A1 EP 94102540 A EP94102540 A EP 94102540A EP 94102540 A EP94102540 A EP 94102540A EP 0668155 A1 EP0668155 A1 EP 0668155A1
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EP
European Patent Office
Prior art keywords
deep
sheets
adhesive
station
sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP94102540A
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German (de)
French (fr)
Inventor
Werner Wieland
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Audi AG
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Audi AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE4242849A priority Critical patent/DE4242849A1/en
Application filed by Audi AG filed Critical Audi AG
Priority to EP94102540A priority patent/EP0668155A1/en
Publication of EP0668155A1 publication Critical patent/EP0668155A1/en
Withdrawn legal-status Critical Current

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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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or 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
    • B21D22/201—Work-pieces; preparation of the work-pieces, e.g. lubricating, coating

Definitions

  • the invention relates to a method for producing deep-drawn aluminum parts, preferably for the body construction of motor vehicles, according to the preamble of claim 1.
  • the invention proposes an apparatus for performing the method.
  • Aluminum sheets are increasingly being used today to reduce weight in motor vehicles. These aluminum sheets take the place of the steel sheets that have been widely used until now.
  • the body components made of aluminum are to largely replace the steel components.
  • the design tasks on motor vehicles require complicated structures that are created in sheet steel by deep-drawing processes.
  • the object of the invention is to facilitate the deep drawing of aluminum sheets.
  • a sandwich sheet which consists of at least two layers of aluminum sheet, the two layers being connected to one another by appropriate adhesive agents. Conventional adhesives are usually used for this.
  • the multilayer structure with an incorporated adhesive layer leads to a considerably improved sound absorption, so that the otherwise usual insulation material can be partially omitted entirely, but at least its scope can be reduced.
  • the sound radiation from mechanical action on the sheet is also significantly reduced in the sandwich sheets.
  • the aluminum sheets for creating the sandwich composite can be of the same thickness in order to simplify storage, the total sheet thickness then results from the sum of the individual sheet thicknesses plus the thickness of the intermediate adhesive or adhesive layer. In certain areas of application, however, it can make sense to choose the thickness of the sheets differently, in particular in the area of the outer sheet it can be advantageous to connect a thicker outer skin to a thinner inner sheet.
  • a special embodiment provides that the starting aluminum sheet is mounted on two coils, the two sheets are then guided one above the other and an adhesive layer is applied between them.
  • the sheets glued together in this way are rewound on a take-up spool so that they can be kept there for later deep-drawing operations and then made available.
  • the reference numeral 10 designates a coil or coil on which aluminum sheet is wound, for example aluminum sheet with a thickness of 0.7 mm, and likewise on the coil 12.
  • the sheet from the coil 10 is used as a running path 14 via rollers 18 and 20 fed to an adhesive station 26, the aluminum from the coil 12 is fed as a running track 16 to the adhesive station 26 via rollers 22 and 24.
  • a roller 28 is provided in the gluing station 26, which is wetted by an adhesive application device 30 on its outer drum with glue which is applied to the opposite surfaces of the webs 16 and 18 by the rotation of the drum 28.
  • the sheets 32 and 34 provided with the adhesive application are then pressed together in a further station by pressure rollers 36, 38, 40 and 42, 44, 46 and thus bond to one another.
  • the sandwich sheet obtained in this way has a thickness which corresponds to the total thickness of the two aluminum sheets 14 and 16, and the adhesive layer located in between. In the present case, if the webs 14 and 16 are approximately 0.7 mm thick, a total thickness of approximately 1.5 mm is obtained. Get this this way Sandwich plate 48 is wound onto a large spool 50 and can be brought from there to the deep-drawing processes.
  • Polyurethane, polyethylene or polypropylene has proven to be suitable as an adhesive for connecting the aluminum sheets. As shown schematically in the figure, these adhesives can be applied over the drum or roller 28.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

Mfg. process for deep drawn aluminium parts, pref. for motor vehicle chassis construction, in which several layers of aluminium sheet is used for deep drawing. Laminating equipment for the process is also claimed. Two aluminium sheets are combined by adhesive bonding. The sheets are unwound from coils, bonded together and recoiled as sandwiched sheet.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen tiefgezogener Aluminiumteile, vorzugsweise für den Karosseriebau von Kraftfahrzeugen, gemäß Oberbegriff des Anspruchs 1.The invention relates to a method for producing deep-drawn aluminum parts, preferably for the body construction of motor vehicles, according to the preamble of claim 1.

Weiterhin wird durch die Erfindung eine Vorrichtung zur Durchführung des Verfahren vorgeschlagen.Furthermore, the invention proposes an apparatus for performing the method.

Es werden heute vermehrt zur Gewichtsreduzierung in Kraftfahrzeugen Aluminiumbleche eingesetzt. Diese Aluminiumbleche treten an die Stelle der bis daher vielfach verwendeten Stahlbleche. Die aus Aluminium gefertigten Karosseriebauteile sollen weitgehend die Stahlbauteile ersetzen. Die Konstruktionsaufgaben an Kraftfahrzeugen erfordern komplizierte Strukturen, die in Stahlblech durch Tiefziehvorgänge erstellt werden.Aluminum sheets are increasingly being used today to reduce weight in motor vehicles. These aluminum sheets take the place of the steel sheets that have been widely used until now. The body components made of aluminum are to largely replace the steel components. The design tasks on motor vehicles require complicated structures that are created in sheet steel by deep-drawing processes.

Es ist wünschenswert, die gleichen Strukturen in Aluminiumblech herzustellen, wobei vorzugsweise die gleichen Tiefziehvorgänge in den gleichen Werkzeugen stattfinden sollen. Dabei erweist sich jedoch in der Praxis, daß Aluminiumbleche leichter dazu neigen, während der Tiefziehvorgänge zu reißen.It is desirable to produce the same structures in aluminum sheet, with preferably the same deep drawing operations taking place in the same tools. In practice, however, it turns out that aluminum sheets are more likely to tear during the deep-drawing processes.

Aufgabe der Erfindung ist es, das Tiefziehen von Aluminiumblechen zu erleichtern. In bevorzugter Weise ist es möglich, die für die Stahlverformung geschaffenen Tiefziehwerkzeuge auch für die Herstellung von Aluminiumkarosserieteilen zu verwenden.The object of the invention is to facilitate the deep drawing of aluminum sheets. In a preferred manner, it is possible to use the deep-drawing tools created for the steel deformation also for the production of aluminum body parts.

Die Aufgabe wird gelöst durch den Hauptanspruch.The task is solved by the main claim.

Erfindungsgemäß ist vorgesehen, daß kein einlagiges Aluminiumblech zum Tiefziehvorgang verwendet wird, sondern daß ein Sandwichblech erstellt wird, das aus mindestens zwei Schichten von Aluminiumblech besteht, wobei die beiden Schichten miteinander durch entsprechende Adhäsionsmittel verbunden sind. Üblicherweise werden dazu herkömmliche Kleber eingesetzt.According to the invention, it is provided that no single-layer aluminum sheet is used for the deep-drawing process, but that a sandwich sheet is created which consists of at least two layers of aluminum sheet, the two layers being connected to one another by appropriate adhesive agents. Conventional adhesives are usually used for this.

Dadurch wird erreicht, daß ein Blech mit einer besseren Steifigkeit und Festigkeit zur Verfügung steht, wodurch es möglich ist, die Blechstärke zu verringern und dadurch zusätzlich eine Gewichtsreduzierung zu erhalten.The result of this is that a sheet with better rigidity and strength is available, which makes it possible to reduce the sheet thickness and thereby additionally to reduce the weight.

Der mehrschichtige Aufbau mit eingelagerter Kleberschicht führt zu einer erheblich verbesserten Schallabsorption, so daß das sonst übliche Dämmaterial zum Teil ganz weggelassen werden kann, zumindest jedoch in seinem Umfang verringert werden kann.The multilayer structure with an incorporated adhesive layer leads to a considerably improved sound absorption, so that the otherwise usual insulation material can be partially omitted entirely, but at least its scope can be reduced.

Auch die Schallabstrahlung bei mechanischer Einwirkung auf das Blech ist bei den Sandwichblechen deutlich reduziert.The sound radiation from mechanical action on the sheet is also significantly reduced in the sandwich sheets.

Bevorzugte Ausführungsformen des Verfahrens sind in den Unteransprüchen beschrieben.Preferred embodiments of the method are described in the subclaims.

Die Aluminiumbleche zur Erstellung des Sandwichverbundes können, um die Lagerhaltung zu vereinfachen, von gleicher Dicke sein, die Gesamtblechstärke ergibt sich dann aus der Summe der Einzelblechstärken plus der Dicke der zwischenliegenden Adhäsions- oder Kleberschicht. In bestimmten Anwendungsbereichen kann es jedoch sinnvoll sein, die Stärke der Bleche unterschiedlich zu wählen, insbesondere im Außenblechbereich kann es günstig sein, eine stärkere Außenhaut mit einem dünneren Innenblech zu verbinden.The aluminum sheets for creating the sandwich composite can be of the same thickness in order to simplify storage, the total sheet thickness then results from the sum of the individual sheet thicknesses plus the thickness of the intermediate adhesive or adhesive layer. In certain areas of application, however, it can make sense to choose the thickness of the sheets differently, in particular in the area of the outer sheet it can be advantageous to connect a thicker outer skin to a thinner inner sheet.

Ebenso ist es nicht notwendig, bei der Wahl der Aluminiumlegierungen für die zu verbindenden Bleche auf jeweils die gleiche Legierung festgelegt zu sein. Bei gleichen Legierungen wird ebenfalls wieder die Lagerhaltung vereinfacht, außerdem sind keine Abweichungen der verschiedenen Teile des Sandwichbleches bei Tiefziehvorgängen oder bei anderen physikalischen Einwirkungen zu erwarten. Wo jedoch eine Abstimmung unterschiedlicher Legierung erwarten läßt, daß den Anforderungen an den Sandwichverbund in besonderer Weise Rechnung getragen wird, kann eine entsprechende Auswahl von Legierungen von Vorteil sein.It is also not necessary to choose the same alloy in each case when choosing the aluminum alloys for the sheets to be joined. With the same alloys, storage is again simplified, and no deviations of the different parts of the sandwich sheet during deep-drawing processes or other physical effects are to be expected. However, where a coordination of different alloys can be expected to take special account of the requirements for the sandwich composite, a corresponding selection of alloys can be advantageous.

Eine besondere Ausgestaltung sieht vor, daß das Ausgangsaluminiumblech auf zwei Spulen gelagert ist, die beiden Bleche dann übereinandergeführt werden und eine Kleberschicht dazwischen aufgebracht wird. Die auf diese Weise miteinander verklebten Bleche werden auf einer Aufnahmespule wieder aufgewickelt, um dort für spätere Tiefziehvorgänge bereitgehalten und dann zur Verfügung gestellt werden zu können.A special embodiment provides that the starting aluminum sheet is mounted on two coils, the two sheets are then guided one above the other and an adhesive layer is applied between them. The sheets glued together in this way are rewound on a take-up spool so that they can be kept there for later deep-drawing operations and then made available.

Im folgenden wird die Erfindung anhand der Figur beschrieben.The invention is described below with reference to the figure.

Mit dem Bezugszeichen 10 ist eine Spule oder Coil bezeichnet, auf der Aluminiumblech aufgewikkelt ist, beispielsweise Aluminiumblech mit einer Stärke von 0,7 mm, desgleichen auf der Spule 12. Das Blech von der Spule 10 wird als laufende Bahn 14 über Rollen 18 und 20 einer Klebstation 26 zugeführt, das Aluminium von der Spule 12 wird als laufende Bahn 16 über Rollen 22 und 24 der Klebestation 26 zugeführt. In der Klebestation 26 ist eine Rolle 28 vorgesehen, die über eine Kleberauftragsvorrichtung 30 auf ihrer Außentrommel mit Klebstoff benetzt wird, der durch die Rotation der Trommel 28 auf die sich gegenüberliegenden Oberflächen der Bahnen 16 und 18 aufgetragen wird.The reference numeral 10 designates a coil or coil on which aluminum sheet is wound, for example aluminum sheet with a thickness of 0.7 mm, and likewise on the coil 12. The sheet from the coil 10 is used as a running path 14 via rollers 18 and 20 fed to an adhesive station 26, the aluminum from the coil 12 is fed as a running track 16 to the adhesive station 26 via rollers 22 and 24. A roller 28 is provided in the gluing station 26, which is wetted by an adhesive application device 30 on its outer drum with glue which is applied to the opposite surfaces of the webs 16 and 18 by the rotation of the drum 28.

Die mit dem Kleberauftrag versehenen Bahnen 32 und 34 werden dann in einer weiteren Station durch Anpreßrollen 36, 38, 40 bzw. 42, 44, 46 zusammengedrückt und verkleben auf diese Weise miteinander. Das so erhaltene Sandwichblech besitzt eine Stärke, die der Gesamtstärke der beiden Aluminiumbleche 14 und 16 entspricht, sowie der dazwischengelagerten Klebeschicht. Im vorliegenden Falle, wenn die Bahnen 14 und 16 etwa 0,7 mm dick sind, wird eine Gesamtstärke von etwa 1,5 mm erhalten. Dieses auf diese Weise erhalten Sandwichblech 48 wird auf eine große Spule 50 aufgewickelt und kann von dort zu den Tiefziehvorgängen gebracht werden.The sheets 32 and 34 provided with the adhesive application are then pressed together in a further station by pressure rollers 36, 38, 40 and 42, 44, 46 and thus bond to one another. The sandwich sheet obtained in this way has a thickness which corresponds to the total thickness of the two aluminum sheets 14 and 16, and the adhesive layer located in between. In the present case, if the webs 14 and 16 are approximately 0.7 mm thick, a total thickness of approximately 1.5 mm is obtained. Get this this way Sandwich plate 48 is wound onto a large spool 50 and can be brought from there to the deep-drawing processes.

Als Kleber zur Verbindung der Aluminiumbleche hat sich Polyurethan, Polyethylen oder Polypropylen als geeignet erwiesen. Diese Kleber können, wie schematisch in der Figur dargestellt, über die Trommel oder Rolle 28 aufgetragen werden.Polyurethane, polyethylene or polypropylene has proven to be suitable as an adhesive for connecting the aluminum sheets. As shown schematically in the figure, these adhesives can be applied over the drum or roller 28.

Alternativ dazu ist es möglich, den Kleber nicht über die Trommel 28 aufzutragen, sondern das Adhäsionsmittel als Klebefolie auszubilden, eine Alternative, die insbesondere bei der Verwendung von Polyethylen als Klebemittel Vorteile mit sich bringt. In diesem Fall müssen zur Herstellung des Sandwichbleches bei zwei Aluminiumlagen drei Folien miteinander verbunden werden. Die endgültige Verklebung kann durch Aufbringung von mechanischem Druck, Wärmezufuhr oder andere physikalische Einwirkungen, ggf. in Verbindung miteinander, durchgeführt werden.Alternatively, it is possible not to apply the adhesive via the drum 28, but rather to form the adhesive as an adhesive film, an alternative which has advantages in particular when using polyethylene as an adhesive. In this case, three foils must be connected to each other to produce the sandwich sheet with two aluminum layers. The final gluing can be carried out by applying mechanical pressure, heat or other physical influences, possibly in connection with each other.

Claims (5)

1. Verfahren zum Herstellen tiefgezogener Aluminiumteile, vorzugsweise für den Karosseriebau von Kraftfahrzeugen,
dadurch gekennzeichnet, daß
man mehrere Lagen Aluminiumblech übereinanderführt,
die Lagen durch Adhäsionsmittel miteinander verbindet,
die so erhaltenen Sandwichbleche in das Tiefziehwerkzeug einlegt, und den Tiefziehvorgang durchführt.1. Method for producing deep-drawn aluminum parts, preferably for the body construction of motor vehicles,
characterized in that
you put several layers of aluminum sheet on top of each other,
the layers are bonded together by adhesive,
insert the sandwich sheets thus obtained into the deep-drawing tool and carry out the deep-drawing process. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zwei Aluminiumbleche verwendet werden, die zur Bildung des Sandwichbleches über Kleber miteinander verbunden werden.2. The method according to claim 1, characterized in that two aluminum sheets are used, which are joined together to form the sandwich sheet via adhesive. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Bleche von Spulen abgewickelt werden, und nach dem Adhäsionsschritt wieder als Sandwichblech auf einer Spule zurückgelagert werden, bevor sie dem Tiefziehvorgang unterworfen werden.3. The method according to claim 1 or 2, characterized in that the sheets are unwound from coils, and after the adhesion step are stored back as a sandwich sheet on a coil before they are subjected to the deep-drawing process. 4. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1,
gekennzeichnet durch
eine Ausgabestation, die mindestens zwei Spulen mit Aluminiumblechen enthält,
eine Klebestation, der die Bleche übereinandergeordnet zugeführt werden und in der das Adhäsionsmittel auf mindestens eine Blechoberfläche, die einer anderen Blechoberfläche gegenüberliegt, aufgebracht wird, und eine Tiefziehstation, in der die verbundenen Bleche in ein Tiefziehwerkzeug eingelegt werden.4. Device for carrying out the method according to claim 1,
marked by
an output station that contains at least two coils with aluminum sheets,
an adhesive station to which the sheets are fed one above the other and in which the adhesive is applied to at least one sheet surface that is opposite another sheet surface, and a deep-drawing station in which the connected sheets are placed in a deep-drawing tool. 5. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß zwischen Klebestation und Tiefziehstation eine Aufnahmestation vorgesehen ist, in der die verklebten Bleche auf einer Spule aufgewickelt werden, um von dort aufgespult zur Tiefziehstation transferiert zu werden.5. Apparatus for carrying out the method according to one of claims 1 to 4, characterized in that a receiving station is provided between the adhesive station and the deep-drawing station, in which the glued sheets are wound up on a spool in order to be wound up from there to be transferred to the deep-drawing station.
EP94102540A 1992-12-18 1994-02-19 Process and apparatus for the manufacture of deep drawn aluminium products Withdrawn EP0668155A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE4242849A DE4242849A1 (en) 1992-12-18 1992-12-18 Method and device for producing deep-drawn aluminum parts
EP94102540A EP0668155A1 (en) 1992-12-18 1994-02-19 Process and apparatus for the manufacture of deep drawn aluminium products

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4242849A DE4242849A1 (en) 1992-12-18 1992-12-18 Method and device for producing deep-drawn aluminum parts
EP94102540A EP0668155A1 (en) 1992-12-18 1994-02-19 Process and apparatus for the manufacture of deep drawn aluminium products

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EP0668155A1 true EP0668155A1 (en) 1995-08-23

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Application Number Title Priority Date Filing Date
EP94102540A Withdrawn EP0668155A1 (en) 1992-12-18 1994-02-19 Process and apparatus for the manufacture of deep drawn aluminium products

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DE (1) DE4242849A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19753110B4 (en) * 1997-11-29 2009-08-06 Volkswagen Ag Method for producing a multiple sheet structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5570424A (en) * 1978-11-18 1980-05-27 Akio Nakano Press working method
US4521265A (en) * 1981-11-20 1985-06-04 Mitsubishi Light Metal Industries Limited Process for preparing laminated plate
DE3416753A1 (en) * 1984-05-07 1985-11-07 Nyffeler, Corti AG, Kirchberg MULTILAYER ALUMINUM FILM WITH PLASTIC BENDING BEHAVIOR

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1254110B (en) * 1965-01-28 1967-11-16 Hoerder Huettenunion Ag Tool for deep drawing composite sheet
DE1527957B1 (en) * 1966-04-05 1971-11-11 Hoesch Ag Process for deep drawing of dethreaded composite sheet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5570424A (en) * 1978-11-18 1980-05-27 Akio Nakano Press working method
US4521265A (en) * 1981-11-20 1985-06-04 Mitsubishi Light Metal Industries Limited Process for preparing laminated plate
DE3416753A1 (en) * 1984-05-07 1985-11-07 Nyffeler, Corti AG, Kirchberg MULTILAYER ALUMINUM FILM WITH PLASTIC BENDING BEHAVIOR

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 4, no. 111 (M - 025) 9 August 1980 (1980-08-09) *

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