EP2217393B1 - Production method of highly dimensionally accurate half shells - Google Patents

Production method of highly dimensionally accurate half shells Download PDF

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Publication number
EP2217393B1
EP2217393B1 EP08858046A EP08858046A EP2217393B1 EP 2217393 B1 EP2217393 B1 EP 2217393B1 EP 08858046 A EP08858046 A EP 08858046A EP 08858046 A EP08858046 A EP 08858046A EP 2217393 B1 EP2217393 B1 EP 2217393B1
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EP
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Prior art keywords
half shell
preformed
shell
finished
section
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German (de)
French (fr)
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EP2217393A1 (en
Inventor
Thomas Flehmig
Lothar HÖMIG
Konstantinos Savvas
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • 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
    • B21D22/30—Deep-drawing to finish articles formed by deep-drawing

Definitions

  • the invention relates to a method for the production of highly dimensionally stable, deep-drawn half-shells with a bottom portion and a frame, wherein first of all a preformed half-shell is formed from a blank, which is subsequently formed into the finished half-shell.
  • closed hollow sections are used in motor vehicles, which have specially adapted to the application cross sections and material thicknesses. So far, closed hollow sections are usually prepared by first a tube is formed, the pipe is subjected to corresponding bends and Vorverformungen and then takes a hydroforming of the pre-bent or pre-formed tube to the final shape of the closed hollow profile. On the one hand, not all components can be produced in this way, since during hydraulic forming local strains of the material are exceeded and thus cracking can occur. In addition, uncontrollable wrinkling may occur during hydroforming. In addition, the previously used process steps for producing an application-adapted, closed hollow profile are very complicated and therefore expensive. Although a closed hollow profile can in principle also be produced from two deep-drawn half shells.
  • a method for producing half-shells is disclosed in the published Japanese patent application JP 08/168830 known, in which a circuit board is first deep-drawn in a die and projecting flange arise. The flange areas are then simultaneously compressed and sheared off via a cutting and punching punch.
  • the problem with the half-shells produced in this way is that they have irregularities at the edges and thus for welding in an I-joint not very well suited.
  • the half shells usually still restoring forces, which complicate the welding.
  • EP 1 792 671 A1 is a method for press-forming of half-shells known, which are then welded to a closed hollow profile.
  • the object of said European patent application is to provide half-shells with thickened edge regions between the bottom region and the frame. For this reason, a preformed half-shell is initially produced from a circuit board, which provides excess material that is pressed from the bottom region into the edge regions between the frame and the bottom region of the half-shell during the forming into the final shape.
  • the present invention is concerned with the reduction of the springback of deep-drawn half shells.
  • the present invention has the object to provide a method for the production of highly dimensionally stable half shells, with which low equipment cost low dimensionally stable half shells can be produced that are easily welded together.
  • the entire cross-section of the preformed half shell due to its geometric shape has excess board material, by the excess material during the Forming the preformed half-shell in its final shape by at least one further pressing operation of the entire cross-section is compressed to the finished half-shell and the finished half-shell substantially over the entire cross section has a relation to the preformed half-shell increased wall thickness.
  • Excess board material in the bottom area are provided by the fact that the bottom portion of the preformed half-shell is concave, convex or wavy shaped.
  • the preformed half shell has flange regions and the frame is stretched over a flange deceleration, the springback of the preformed half shell can already be reduced.
  • Flange-free half-shells can be made available according to a further developed embodiment of the method according to the invention in that the flange areas are separated during and / or after the forming of the finished half-shell via cross slide or laser cutting or by other methods. Despite the preformed half shells with flange areas used, an economical method for the preferred production of high-dimensional, flange-less shells is thus provided.
  • the strengths required, for example, for the use of the half shells in motor vehicle construction can be made available in that the board consists of steel or a steel alloy. At the same time good forming properties of the boards are provided.
  • the inventive method in that the deformation of the board in the preformed half-shell and the deformation of the preformed half-shell in the final shape in a single device, preferably in a single die with exchangeable bottom takes place, for example, which can be realized in a progressive compound tool. Not only investment costs can be saved with it, but usually also cycle times for the production of half-shells, since transport paths between different dies omitted. This leads to a particularly high efficiency of the method according to the invention.
  • a preformed half-shell 1 is shown in a schematic sectional view.
  • the half-shell has a frame 2 and a bottom portion 3.
  • the bottom portion 3 is slightly curved and the additional flanges 4 are provided.
  • FIG. 2a A first embodiment of the method according to the invention is now in the Fig. 2a) and 2b ) dargterrorism.
  • the figures show schematically a die 5 with a die 6, which together with the punch 7 the now flangeless half shell 1 can transform to the final shape.
  • Fig. 2a it can be seen that the punch 7 due to the preform of the half-shell 1 in the deformation of the half-shell 1, the bottom portion 3 and the frame 2 upsets. Due to the compression process, a material flow is generated, which is approximately those in Fig. 2a ) corresponds to arrows.
  • the wall thickness of the finished half shell over the entire cross section is slightly increased by upsetting over the entire cross section. The increase in the wall thickness is not shown in the figures.
  • the first preformed half-shell 1 initially has a convex bottom area 3 in order to provide additional board material for the compression.
  • Fig. 1 represents the preformed half-shell 1 'of Fig. 3 the additional board material for compression available, because the preformed half-shell 1 'has a convex bottom portion 3' on.
  • the excess material from the convex bottom portion is pressed into the side regions or in the frame region of the half-shell, so that in the frame 2 'perpendicular to the bottom region extending and in the bottom region horizontally extending voltages are introduced, which for remindfederungsarmut the finished molded half-shell 1 'lead.
  • the punch 7 ' is particularly simple and has no elements for compression of the frame.
  • the compression of the frame 2 ' is achieved via the hold-down 8', which cause a compression due to the flow of material from the bottom portion 3 '.
  • a preformed half shell 1 " is shown, which according to a third embodiment of the method according to the invention also during the forming flange 4" has.
  • the flange 4 are held by downholders 8" during the forming according to a third embodiment of the method according to the invention, as shown in FIG Fig. 6a) and 6b ) is recognizable.
  • the bottom portion 3 is convexly preformed in the third embodiment, so that sufficient board material can be provided to compress the bottom portion 3" and the frame 2 "according to the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

The invention relates to a method for producing highly dimensionally accurate, deep-drawn half shells having a floor area (3) and a notch (2), wherein a preformed half shell (1) is first formed from a circuit board. The task of providing a method for producing highly dimensionally accurate half shells, with which highly dimensionally accurate half shells which can be easily welded to one another can be manufactured cost-effectively with minimal machined-based complexity, is achieved according to the invention in that due to the geometric shape the entire cross-section of the preformed half shell (1) has excess circuit board material, the entire cross-section is compressed by the excess material in the final shape thereof during reshaping of the preformed half shell (1) by way of at least one more pressing procedure into the finished half shell, and the finished half shell has an enlarged wall thickness substantially over the entire cross-section.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von hoch maßhaltigen, tiefgezogenen Halbschalen mit einem Bodenbereich und einer Zarge, wobei zunächst aus einer Platine eine vorgeformte Halbschale geformt wird, welche anschließend zur fertigen Halbschale umgeformt wird.The invention relates to a method for the production of highly dimensionally stable, deep-drawn half-shells with a bottom portion and a frame, wherein first of all a preformed half-shell is formed from a blank, which is subsequently formed into the finished half-shell.

Zunehmend werden in Kraftfahrzeugen geschlossene Hohlprofile eingesetzt, welche speziell an den Anwendungsfall angepasste Querschnitte und Materialdicken aufweisen. Bisher werden geschlossene Hohlprofile in der Regel dadurch hergestellt, dass zunächst ein Rohr geformt wird, das Rohr entsprechenden Biegungen und Vorverformungen unterzogen wird und anschließend ein Hydroumformen des vorgebogenen oder vorverformten Rohres zur endgültigen Form des geschlossenen Hohlprofils erfolgt. Einerseits sind auf diese Weise nicht alle Bauteile herstellbar, da beim Hydroumformen lokale Dehnungen des Materials überschritten werden und es somit zur Rissbildung kommen kann. Zusätzlich kann es zu einer nicht beherrschbaren Faltenbildung während des Hydroumformens kommen. Darüber hinaus sind die bisher verwendeten Verfahrensschritte zur Herstellung eines anwendungsangepassten, geschlossenen Hohlprofils sehr aufwendig und damit kostenintensiv. Ein geschlossenes Hohlprofil kann zwar prinzipiell auch aus zwei tiefgezogenen Halbschalen hergestellt werden. Während des Tiefziehens einer Platine werden jedoch Spannungen in die Platine eingebracht, welche zu einem Rückfedern der Halbschale führen. Das Rückfedern der Halbschalen erschwert die genaue Positionierung der Halbschalen in einem Gesenk zum Verschweißen der Halbschalen zu einem geschlossenen Hohlprofil. Ein Verschweißen der Kanten der Halbschalen in einem I-Stoß war aufgrund des Rückfederns der Halbschalen bisher nur mit großem Aufwand während der Positionierung der Halbschalen beim Verschweißen möglich. Aus diesem Grund sind bisher geschlossene Hohlprofile, welche aus verschweißten Halbschalen bestehen, üblicherweise an abstehenden Flanschbereichen verschweißt worden. Diese geschlossenen Hohlprofile können aber aufgrund der abstehenden Schweißnaht nicht so eingesetzt werden wie geschlossene Hohlprofile, die aus einem geschweißten Rohr hergestellt werden und keine abstehende Schweißnaht aufweisen. Zudem erhöhen die Flansche das Gesamtgewicht des Bauteils.Increasingly closed hollow sections are used in motor vehicles, which have specially adapted to the application cross sections and material thicknesses. So far, closed hollow sections are usually prepared by first a tube is formed, the pipe is subjected to corresponding bends and Vorverformungen and then takes a hydroforming of the pre-bent or pre-formed tube to the final shape of the closed hollow profile. On the one hand, not all components can be produced in this way, since during hydraulic forming local strains of the material are exceeded and thus cracking can occur. In addition, uncontrollable wrinkling may occur during hydroforming. In addition, the previously used process steps for producing an application-adapted, closed hollow profile are very complicated and therefore expensive. Although a closed hollow profile can in principle also be produced from two deep-drawn half shells. During the deep drawing of a board but tensions in the Board introduced, which lead to a springback of the half shell. The springback of the half shells complicates the exact positioning of the half shells in a die for welding the half shells to a closed hollow profile. Welding the edges of the half-shells in an I-shock was previously possible only with great effort during the positioning of the half-shells during welding due to the springback of the half-shells. For this reason, previously closed hollow sections, which consist of welded half-shells, have usually been welded to projecting flange areas. However, these closed hollow sections can not be used as closed hollow sections, which are made of a welded tube and have no protruding weld due to the protruding weld. In addition, the flanges increase the overall weight of the component.

Ein Zusammenbau von stark rückfedernden Halbschalen in einer Fahrzeugstruktur ist aufgrund des starken Verzugs sehr aufwendig. Hilfsweise müssen diese Teile gerichtet werden, was mit höheren Kosten verbunden ist.An assembly of highly resilient half shells in a vehicle structure is very expensive due to the strong delay. Alternatively, these parts must be addressed, which is associated with higher costs.

Ein Verfahren zur Herstellung von Halbschalen ist aus der veröffentlichen japanischen Patentanmeldung JP 08/168830 bekannt, bei welchem eine Platine zunächst in einem Gesenk tiefgezogen wird und abstehende Flanschbereiche entstehen. Die Flanschbereiche werden anschließend über einen Schneid- und Stauchstempel gleichzeitig gestaucht und abgeschert. Problematisch bei den so hergestellten Halbschalen ist, dass diese Unregelmäßigkeiten an den Kanten aufweisen und damit zum Verschweißen in einem I-Stoß nicht besonders gut geeignet sind. Darüber hinaus weisen die Halbschalen üblicherweise noch Rückfederungskräfte auf, die das Verschweißen erschweren.A method for producing half-shells is disclosed in the published Japanese patent application JP 08/168830 known, in which a circuit board is first deep-drawn in a die and projecting flange arise. The flange areas are then simultaneously compressed and sheared off via a cutting and punching punch. The problem with the half-shells produced in this way is that they have irregularities at the edges and thus for welding in an I-joint not very well suited. In addition, the half shells usually still restoring forces, which complicate the welding.

Aus der veröffentlichen europäischen Patentanmeldung EP 1 792 671 A1 ist ein Verfahren zum Pressformen von Halbschalen bekannt, welche anschließend zu einem geschlossenen Hohlprofil verschweißt werden. Aufgabe der genannten europäischen Patentanmeldung ist es, Halbschalen mit verdickten Kantenbereichen zwischen dem Bodenbereich und der Zarge zur Verfügung zu stellen. Aus diesem Grund wird aus einer Platine zunächst eine vorgeformte Halbschale erzeugt, welche überschüssiges Material zur Verfügung stellt, das beim Umformen in die Endform aus dem Bodenbereich in die Kantenbereiche zwischen Zarge und Bodenbereich der Halbschale gepresst wird. Dem gegenüber beschäftigt sich die vorliegende Erfindung mit der Reduzierung der Rückfederung von tiefgezogenen Halbschalen.From the published European patent application EP 1 792 671 A1 is a method for press-forming of half-shells known, which are then welded to a closed hollow profile. The object of said European patent application is to provide half-shells with thickened edge regions between the bottom region and the frame. For this reason, a preformed half-shell is initially produced from a circuit board, which provides excess material that is pressed from the bottom region into the edge regions between the frame and the bottom region of the half-shell during the forming into the final shape. In contrast, the present invention is concerned with the reduction of the springback of deep-drawn half shells.

Hiervon ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Verfahren zur Herstellung von hoch maßhaltigen Halbschalen zur Verfügung zu stellen, mit welchem bei geringem apparativen Aufwand kostengünstig hoch maßhaltige Halbschalen hergestellt werden können, die auf einfache Weise miteinander verschweißbar sind.Proceeding from this, the present invention has the object to provide a method for the production of highly dimensionally stable half shells, with which low equipment cost low dimensionally stable half shells can be produced that are easily welded together.

Die oben aufgezeigte Aufgabe wird gemäß der Lehre der vorliegenden Erfindung dadurch gelöst, dass der gesamte Querschnitt der vorgeformten Halbschale aufgrund seiner geometrischen Form überschüssiges Platinenmaterial aufweist, durch das überschüssige Material während des Umformens der vorgeformten Halbschale in ihre Endform durch mindestens einen weiteren Pressvorgang der gesamte Querschnitt zur fertigen Halbschale gestaucht wird und die fertige Halbschale im Wesentlichen über den gesamten Querschnitt eine gegenüber der vorgeformten Halbschale vergrößerte Wanddicke aufweist.The above object is achieved according to the teachings of the present invention in that the entire cross-section of the preformed half shell due to its geometric shape has excess board material, by the excess material during the Forming the preformed half-shell in its final shape by at least one further pressing operation of the entire cross-section is compressed to the finished half-shell and the finished half-shell substantially over the entire cross section has a relation to the preformed half-shell increased wall thickness.

Aufgrund des überschüssigen Materials kommt es beim Pressen zur Endform im Fertiggesenk zum Stauchen des gesamten Querschnitts, so dass das überschüssige Material im gesamten Querschnitt verteilt wird. Hierdurch wird der gesamte Querschnitt gestaucht, was dazu führt, dass die während des Pressens in die vorgeformte Halbschale eingebrachten Spannungen im Bereich der Zarge in senkrechte und im Bereich des Bodens in waagerechte Richtungen ausgerichtet werden. Der Pressvorgang zur Endform führt hierbei zu einer Erhöhung der Wanddicke der Halbschale. Gleichzeitig wird die Rückfederung der Halbschale beseitigt, da die eingebrachten Stauchungen die Rückfederungskräfte überlagern bzw. in ein gerichtetes Rückfedern auslösende Spannungen in der Halbschale transformieren. Im Ergebnis steht eine fertig geformte Halbschale mit einer besonders hohen Maßhaltigkeit zur Verfügung. Die hohe Maßhaltigkeit führt dazu, dass die nach dem erfindungsgemäßen Verfahren hergestellten Halbschalen auf einfache Weise beispielsweise bei flanschlosen Halbschalen in einem I-Stoß verschweißt werden können. Unter hohen Maßhaltigkeiten sind reduzierte Toleranzen gegenüber dem konventionellen Tiefziehen zu verstehen.Due to the excess material it comes to the compression of the final shape in the finished die for upsetting the entire cross section, so that the excess material is distributed throughout the cross section. As a result, the entire cross section is compressed, which means that the introduced during pressing into the preformed half shell stresses in the frame in the vertical and in the region of the bottom are aligned in horizontal directions. The pressing process for the final shape leads to an increase in the wall thickness of the half shell. At the same time, the springback of the half-shell is eliminated, since the introduced compressions superimpose the restoring forces or transform stresses in a half-shell into a directed return spring. As a result, a finished molded half-shell with a particularly high dimensional stability is available. The high dimensional accuracy means that the half-shells produced by the method according to the invention can be welded in a simple manner, for example in flangeless half shells in an I-joint. High dimensional stability means reduced tolerances compared to conventional deep drawing.

Auf besonders einfache Art und Weise kann gemäß einer ersten Ausgestaltung der vorliegenden Erfindung überschüssiges Platinenmaterial im Bodenbereich dadurch zur Verfügung gestellt werden, dass der Bodenbereich der vorgeformten Halbschale konkav, konvex oder wellig geformt ist.In a particularly simple manner, according to a first embodiment of the present invention Excess board material in the bottom area are provided by the fact that the bottom portion of the preformed half-shell is concave, convex or wavy shaped.

Weist gemäß einer nächsten Ausgestaltung des erfindungsgemäßen Verfahrens die vorgeformte Halbschale Flanschbereiche auf und wird die Zarge über eine Flanschabbremsung abgestreckt, kann die Rückfederung der vorgeformten Halbschale bereits reduziert werden.If, in accordance with a next embodiment of the method according to the invention, the preformed half shell has flange regions and the frame is stretched over a flange deceleration, the springback of the preformed half shell can already be reduced.

Flanschlose Halbschalen können gemäß einer weitergebildeten Ausführungsform des erfindungsgemäßen Verfahrens dadurch zur Verfügung gestellt werden, dass die Flanschbereiche während und/oder nach der Umformung zur fertigen Halbschale über Querschieber oder Laserbeschnitt oder durch andere Verfahren abgetrennt werden. Trotz der verwendeten vorgeformten Halbschalen mit Flanschbereichen wird damit ein wirtschaftliches Verfahren zur bevorzugten Herstellung von hoch maßhaltigen, flanschlosen Halbschalen zur Verfügung gestellt.Flange-free half-shells can be made available according to a further developed embodiment of the method according to the invention in that the flange areas are separated during and / or after the forming of the finished half-shell via cross slide or laser cutting or by other methods. Despite the preformed half shells with flange areas used, an economical method for the preferred production of high-dimensional, flange-less shells is thus provided.

Gemäß einer weiteren Ausführungsform des erfindungsgemäßen Verfahrens können die beispielsweise für den Einsatz der Halbschalen im Kraftfahrzeugbau notwendigen Festigkeiten dadurch zur Verfügung gestellt werden, dass die Platine aus Stahl oder einer Stahllegierung besteht. Gleichzeitig werden gute Umformeigenschaften der Platinen bereitgestellt.According to a further embodiment of the method according to the invention, the strengths required, for example, for the use of the half shells in motor vehicle construction can be made available in that the board consists of steel or a steel alloy. At the same time good forming properties of the boards are provided.

Weiter verbessert werden kann das erfindungsgemäße Verfahren dadurch, dass die Umformung der Platine in die vorgeformte Halbschale und die Umformung der vorgeformten Halbschale in die Endform in einer einzigen Vorrichtung, vorzugsweise in einem einzigen Gesenk mit austauschbarem Boden erfolgt, beispielsweise was in einem Folgeverbundwerkzeug realisiert werden kann. Nicht nur Investitionskosten können damit eingespart, sondern üblicherweise auch Zykluszeiten zur Herstellung der Halbschalen, da Transportwege zwischen verschiedenen Gesenken entfallen. Dies führt zu einer besonders hohen Wirtschaftlichkeit des erfindungsgemäßen Verfahrens.Can be improved, the inventive method in that the deformation of the board in the preformed half-shell and the deformation of the preformed half-shell in the final shape in a single device, preferably in a single die with exchangeable bottom takes place, for example, which can be realized in a progressive compound tool. Not only investment costs can be saved with it, but usually also cycle times for the production of half-shells, since transport paths between different dies omitted. This leads to a particularly high efficiency of the method according to the invention.

Es gibt nun eine Vielzahl von Möglichkeiten das erfindungsgemäße Verfahren auszugestalten und weiterzubilden. Hierzu wird verwiesen einerseits auf die dem Patentanspruch 1 nachgeordneten Patentansprüche und andererseits auf die Beschreibung von drei Ausführungsbeispielen des erfindungsgemäßen Verfahrens in Verbindung mit der Zeichnung. Die Zeichnung zeigt in

Fig. 1
in einer schematischen Schnittansicht eine vorgeformte Halbschale gemäß einem ersten Ausführungsbeispiel des erfindungsgemäßen Verfahrens,
Fig. 2a) und b)
in einer schematischen Schnittansicht die beschnittene, vorgeformte Halbschale aus Fig. 1 während eines zweistufigen Umformens gemäß dem ersten Ausführungsbeispiel des erfindungsgemäßen Verfahrens,
Fig. 3
in einer schematischen Schnittansicht eine vorgeformte Halbschale gemäß einem zweiten Ausführungsbeispiel des erfindungsgemäßen Verfahrens,
Fig. 4a) und b)
in einer schematischen Schnittansicht die Umformung der vorgeformten Halbschale zur fertigen Halbschale gemäß dem zweiten Ausführungsbeispiel des erfindungsgemäßen Verfahrens,
Fig. 5
in einer schematischen Schnittansicht eine vorgeformte Halbschale gemäß einem dritten Ausführungsbeispiel des erfindungsgemäßen Verfahrens und
Fig. 6a) und b)
die Umformung der vorgeformten Halbschale zur Endform gemäß dem dritten Ausführungsbeispiel des erfindungsgemäßen Verfahrens.
There are now a multitude of possibilities for designing and developing the method according to the invention. Reference is made on the one hand to the claims subordinate to claim 1 and on the other hand to the description of three embodiments of the method according to the invention in conjunction with the drawing. The drawing shows in
Fig. 1
1 is a schematic sectional view of a preformed half shell according to a first exemplary embodiment of the method according to the invention,
Fig. 2a) and b)
in a schematic sectional view of the trimmed, preformed half shell Fig. 1 during a two-stage forming according to the first embodiment of the method according to the invention,
Fig. 3
1 is a schematic sectional view of a preformed half shell according to a second exemplary embodiment of the method according to the invention,
Fig. 4a) and b)
in a schematic sectional view, the deformation of the preformed half-shell to the finished half-shell according to the second embodiment of the method according to the invention,
Fig. 5
in a schematic sectional view of a preformed half-shell according to a third embodiment of the method according to the invention and
Fig. 6a) and b)
the deformation of the preformed half-shell to the final shape according to the third embodiment of the method according to the invention.

In Fig. 1 ist zunächst eine vorgeformte Halbschale 1 in einer schematischen Schnittansicht dargestellt. Die Halbschale weist eine Zarge 2 sowie einen Bodenbereich 3 auf. In Fig. 1 ist des Weiteren zu erkennen, dass der Bodenbereich 3 leicht gewölbt ist und das zusätzlich Flansche 4 vorgesehen sind.In Fig. 1 First, a preformed half-shell 1 is shown in a schematic sectional view. The half-shell has a frame 2 and a bottom portion 3. In Fig. 1 can be further seen that the bottom portion 3 is slightly curved and the additional flanges 4 are provided.

Ein erstes Ausführungsbeispiel des erfindungsgemäßen Verfahrens ist nun in den Fig. 2a) und 2b) dargstellt. Zunächst zeigen die Figuren schematisch ein Gesenk 5 mit einer Matrize 6, welche zusammen mit dem Stempel 7 die nunmehr flanschlose Halbschale 1 zur Endform umformen können. In Fig. 2a) ist zu erkennen, dass der Stempel 7 aufgrund der Vorform der Halbschale 1 bei der Umformung bei der Halbschale 1 den Bodenbereich 3 und die Zarge 2 staucht. Aufgrund des Stauchungsvorgangs wird ein Materialfluss erzeugt, welcher in etwa denen in Fig. 2a) dargestellten Pfeilen entspricht. Einerseits wird durch das Stauchen über den gesamten Querschnitt die Wanddicke der fertigen Halbschale über den gesamten Querschnitt leicht erhöht. Die Erhöhung der Wanddicke ist in der Figuren nicht dargestellt. Andererseits bedeutet dies auch gleichzeitig, dass bei der Umformung Spannungen in horizontaler Richtung im Bodenbereich 3 und in vertikaler Richtung in der Zarge 2 erzeugt werden. Die Rückfederungskräfte werden hierdurch in Spannungen, welche eine gerichtete Rückfederung auslösen, transformiert. Diese führen dann dazu, dass die fertig geformte Halbschale 1 hoch maßhaltig ist. Die erste vorgeformte Halbschale 1 weist zunächst einen konvexen Bodenbereich 3 auf, um zusätzliches Platinenmaterial für die Stauchung zur Verfügung zu stellen.A first embodiment of the method according to the invention is now in the Fig. 2a) and 2b ) dargstellt. First, the figures show schematically a die 5 with a die 6, which together with the punch 7 the now flangeless half shell 1 can transform to the final shape. In Fig. 2a ) it can be seen that the punch 7 due to the preform of the half-shell 1 in the deformation of the half-shell 1, the bottom portion 3 and the frame 2 upsets. Due to the compression process, a material flow is generated, which is approximately those in Fig. 2a ) corresponds to arrows. On the one hand, the wall thickness of the finished half shell over the entire cross section is slightly increased by upsetting over the entire cross section. The increase in the wall thickness is not shown in the figures. On the other hand, this also means at the same time that stresses are generated in the horizontal direction in the bottom region 3 and in the vertical direction in the frame 2 during the deformation. The springback forces are thereby transformed into stresses which trigger a directed springback. These then lead to the finished molded half-shell 1 is highly dimensionally stable. The first preformed half-shell 1 initially has a convex bottom area 3 in order to provide additional board material for the compression.

Anders als das Ausführungsbeispiel aus Fig. 1 stellt die vorgeformte Halbschale 1' der Fig. 3 das zusätzliche Platinenmaterial für die Stauchung zur Verfügung, denn die vorgeformte Halbschale 1' weist einen konvexen Bodenbereich 3' auf. Während der Umformung wird das überschüssige Material aus dem konvexen Bodenbereich in die Seitenbereiche bzw. in den Zargenbereich der Halbschale gedrückt, so dass in der Zarge 2' senkrecht zum Bodenbereich verlaufende und im Bodenbereich horizontal verlaufende Spannungen eingebracht werden, welche zur Rückfederungsarmut der fertig geformten Halbschale 1' führen. In den Fig. 4a) und 4b) ist zudem zu erkennen, dass der Stempel 7' besonders einfach ausgeprägt ist und keine Elemente zur Stauchung der Zarge aufweist. Die Stauchung der Zarge 2' wird über die Niederhalter 8' erreicht, welche aufgrund des Materialflusses aus dem Bodenbereich 3' eine Stauchung herbeiführen.Unlike the embodiment Fig. 1 represents the preformed half-shell 1 'of Fig. 3 the additional board material for compression available, because the preformed half-shell 1 'has a convex bottom portion 3' on. During the deformation, the excess material from the convex bottom portion is pressed into the side regions or in the frame region of the half-shell, so that in the frame 2 'perpendicular to the bottom region extending and in the bottom region horizontally extending voltages are introduced, which for Rückfederungsarmut the finished molded half-shell 1 'lead. In the Fig. 4a) and 4b ) can also be seen that the punch 7 'is particularly simple and has no elements for compression of the frame. The compression of the frame 2 'is achieved via the hold-down 8', which cause a compression due to the flow of material from the bottom portion 3 '.

In Fig. 5 ist schließlich in einer schematischen Schnittansicht eine vorgeformte Halbschale 1" dargestellt, welche gemäß eines dritten Ausführungsbeispiels des erfindungsgemäßen Verfahrens auch während der Umformung Flanschbereiche 4" aufweist. Die Flanschbereiche 4" werden von Niederhaltern 8" während der Umformung gemäß einem dritten Ausführungsbeispiel des erfindungsgemäßen Verfahrens gehalten, wie anhand der Fig. 6a) und 6b) zu erkennen ist. Der Bodenbereich 3" ist in dem dritten Ausführungsbeispiel konvex vorgeformt, so dass genügend Platinenmaterial zur Verfügung gestellt werden kann, um den Bodenbereich 3" und die Zarge 2" erfindungsgemäß zu stauchen. Anschließend können die Flansche 4" beschnitten werden.In Fig. 5 Finally, in a schematic sectional view, a preformed half shell 1 "is shown, which according to a third embodiment of the method according to the invention also during the forming flange 4" has. The flange 4 "are held by downholders 8" during the forming according to a third embodiment of the method according to the invention, as shown in FIG Fig. 6a) and 6b ) is recognizable. The bottom portion 3 "is convexly preformed in the third embodiment, so that sufficient board material can be provided to compress the bottom portion 3" and the frame 2 "according to the invention.

Claims (6)

  1. A method for producing highly dimensionally accurate, deep-drawn half shells (1; 1'; 1") with a bottom area and a wall, wherein a blank is initially shaped into a preformed half shell (1; 1'; 1") by means of deep-drawing and the preformed half shell is subsequently reshaped into the finished half shell,
    characterized in that
    the entire cross section of the preformed half shell (1; 1'; 1") features excess blank material due to its geometric shape, in that the entire cross section is compressed into the finished half shell by the excess material during the reshaping of the preformed half shell into its final shape by means of at least one additional pressing cycle, and in that the finished half shell has a wall thickness that is increased in comparison with that of the preformed half shell over essentially the entire cross section.
  2. The method according to Claim 1,
    characterized in that
    the bottom area (3; 3'; 3") of the preformed half shell (1; 1'; 1") has a concave, convex or undulated shape.
  3. The method according to Claim 1 or 2,
    characterized in that
    the preformed half shell (1; 1'; 1") features flange areas (4; 4") and the wall (2; 2'; 2") is ironed by means of a flange deceleration.
  4. The method according to one of Claims 1 to 3,
    characterized in that
    the flange areas (4; 4") are removed by means of cross slides or laser trimming during and/or after the reshaping into the finished half shell (1; 1'; 1").
  5. The method according to one of Claims 1 to 4,
    characterized in that
    the blank consist of steel or a steel alloy.
  6. The method according to one of Claims 1 to 5,
    characterized in that
    the shaping of the blank into the preformed half shell and the reshaping of the preformed half shell into the final shape take place in a device, preferably in a die with exchangeable bottom.
EP08858046A 2007-12-07 2008-11-17 Production method of highly dimensionally accurate half shells Active EP2217393B1 (en)

Applications Claiming Priority (2)

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DE102007059251A DE102007059251A1 (en) 2007-12-07 2007-12-07 Production method of high dimensional half shells
PCT/EP2008/065700 WO2009071437A1 (en) 2007-12-07 2008-11-17 Production method of highly dimensionally accurate half shells

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EP2217393A1 EP2217393A1 (en) 2010-08-18
EP2217393B1 true EP2217393B1 (en) 2012-03-14

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CN (2) CN104959442A (en)
AT (1) ATE549110T1 (en)
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US11179762B2 (en) 2016-12-23 2021-11-23 Thyssenkrupp Ag Method and device for producing sheet-metal components
US11267032B2 (en) 2017-01-05 2022-03-08 thyssenknupp AG Method for producing sheet metal components and device therefor

Also Published As

Publication number Publication date
WO2009071437A1 (en) 2009-06-11
ATE549110T1 (en) 2012-03-15
CN104959442A (en) 2015-10-07
CN101888908A (en) 2010-11-17
DE102007059251A1 (en) 2009-06-10
EP2217393A1 (en) 2010-08-18

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