EP1818115A1 - Method for manufacturing a structural or chassis element for motor vehicles and structural or chassis element - Google Patents

Method for manufacturing a structural or chassis element for motor vehicles and structural or chassis element Download PDF

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Publication number
EP1818115A1
EP1818115A1 EP07000296A EP07000296A EP1818115A1 EP 1818115 A1 EP1818115 A1 EP 1818115A1 EP 07000296 A EP07000296 A EP 07000296A EP 07000296 A EP07000296 A EP 07000296A EP 1818115 A1 EP1818115 A1 EP 1818115A1
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EP
European Patent Office
Prior art keywords
structural
edge
chassis component
press tool
bead
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.)
Granted
Application number
EP07000296A
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German (de)
French (fr)
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EP1818115B1 (en
Inventor
Hans-Jürgen Knaup
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Benteler Automobiltechnik GmbH
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Benteler Automobiltechnik GmbH
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Publication of EP1818115A1 publication Critical patent/EP1818115A1/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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49616—Structural member making
    • Y10T29/49622—Vehicular structural member making

Definitions

  • the invention relates to a method for producing a structural or chassis component for motor vehicles and, on the other hand, to such a structural or chassis component.
  • the trimming edges are very often a weak point from which cracks go out, especially under dynamic load or in the event of a crash.
  • the reasons for this are the operational high loads in these edge areas.
  • structural changes and micro-cracks occur during mechanical trimming, which increase the susceptibility of the structure or chassis components to cracking.
  • the sheet thickness at the trim edge is reduced due to the necessary cutting pressure.
  • the technological background also includes the DE 33 43 709 A1 .
  • a method for producing a structural or chassis component in the form of a frame part for motor vehicles is described.
  • the frame component is formed from a blank in a press tool with the special feature that there the blank is partially rolled off and thus has sections of different thickness.
  • the invention is based on the prior art, the task of demonstrating a method for the production of structural or chassis components for motor vehicles with improved and more accurate edge properties and to create a structure or chassis component which is improved with respect to its load behavior.
  • a board made of steel or a light metal is used.
  • a material storage is provided, which is moved and transformed during the forming process in other areas of the structural or chassis component.
  • the board is pressed during the forming process to the structural or chassis component at least at one edge against an abutment in the press tool and formed the material storage in a recess in the press tool. This results in a precise, precisely defined longitudinal edge region on the edge of the structural or chassis component.
  • the procedure according to the invention ensures component edges of high quality, in which microcracks are reliably cold-solidified or hot-pressed.
  • the susceptibility to cracking of the structural or chassis components in the edge region is significantly reduced and overall increases the life of a structural or chassis component according to the invention.
  • the edge of the board is formed in the press tool such that a bead is formed at the edge.
  • One or more beads can be produced on the structural or chassis component. According to the invention, it is provided that a bead is applied, above all, in regions of a structural or chassis component that are subject to cracking or tight tolerances.
  • a circuit board can be used, which has a certain excess compared with the development of the structural or chassis component, so that the Board has a reserve of material to produce one or more beads on the edges.
  • the otherwise often customary subsequent trimming of the outer contour of the structural or chassis components due to fluctuations in the outer contour can be dispensed with. Due to the targeted provision and subsequent displacement of material in the area of the outer edge with defined shaping of the edges subsequent trimming operations are saved. This procedure is particularly suitable for hot-formed press-hardened structural or chassis components.
  • a particularly advantageous embodiment of the method according to the invention provides, initially at least along an edge of the board at a small distance from the outer edge of the board to form a wavy material storage in the manner of a bead.
  • the bead serves as a material reserve during the forming process.
  • the board is formed in the press tool for structural or chassis component.
  • the material storage is leveled in the press tool under material displacement in the direction of the outer edge, so that arises at the edge of the bead.
  • the material storage can be introduced simultaneously with the cutting of the board in a subsequent tool without a separate operation.
  • the edge can also be designed with recesses and as a hole edge.
  • the circuit board or the structural or chassis component may have perforations, for example holes or similar recesses, which are finally shaped to tolerance during the forming process in the press tool.
  • the edge of the openings can also be provided with a bead.
  • the structure or chassis component can be formed both warm and cold.
  • advantageously at least partial hardening of the structural or chassis component in the press tool can be carried out.
  • the structural or chassis component comprises a shell body produced by the method according to the invention.
  • the shell body has a U-shaped or V-shaped cross-section with a web and two legs, with the ends preferably connected to the legs outwardly directed flanges.
  • a bead extends along the edge of the component. This bead protrudes toward the bridge opposite the flange.
  • To complete the shell body is closed by a strike plate, which is joined at each of the flanges with the shell body. The joining takes place at the flat side of the flanges lying opposite the bead so that flat contact surfaces of the flanges and the striking plate are placed against one another and joined.
  • the beads thus do not present an obstacle during joining, in particular during spot welding.
  • the structure or chassis component according to the invention is highly resilient both statically and dynamically and has a significantly lower susceptibility to crack formation at the component edges.
  • Figure 1 shows a circuit board 1 made of steel or a light metal. This has been separated from a coil and optionally pre-assembled by means of a cutting operation.
  • the circuit board 1 is used to produce a structural or chassis component for motor vehicles.
  • a wavy material storage 6, 7 formed in the manner of a bead.
  • the material stores 6, 7 can be produced when trimming the board 1 in a follower tool.
  • the board 1 provided with the material stores 6, 7 is then converted into a structural or chassis component 9 in a press tool 8, as shown in FIG. 3 (see also FIGS. 4 and 5).
  • the press tool 8 may be a cold forming or a hot forming tool.
  • the pressing tool 8 comprises an upper tool 10 and a lower tool 11, between which a forming space 12 is formed during the forming process.
  • the circuit board 1 is inserted into the press tool and the upper tool 10 and the lower tool 11 are displaced relative to each other ( Figure 3a).
  • a shell body 13 is formed with a U-shaped cross-section, which has a web 14 and two legs 15, 16, to which each end facing outward flanges 17, 18th connect.
  • the material supplies 6, 7 are leveled with material displacement in the direction of the outer edges 4, 5.
  • the edges 2, 3 of the board 1 are each pressed against an abutment 19, 20 in the lower tool 11 of the press tool 8 and formed into a recess 21, 22 in the upper tool 10 of the press tool 8, so that at the edges 2, 3 each have a bead 23, 24 arises.
  • the beads 23, 24 provide defined longitudinal edge areas along the edges 2, 3 on the structural or chassis component 9 safely with low susceptibility to cracking and high dimensional accuracy. Subsequent trimming operations along the edges 2, 3 on the structural or chassis component 9 can be omitted.
  • FIGS. 4 and 5 show a section of the shell body 13 of a structural or chassis component 9 according to the invention.
  • the shell body 13 is closed by a closing plate 25, which in each case lies on the flat side 26, 27 of the flanges 17 opposite the beads 23, 24. 18 is joined to the shell body 13.
  • E1 and E2 are designated in Figures 4 and 5 welding electrodes.
  • E1 and E3 of the shell body 13 and the striking plate 25 ddling the welding electrodes E1 and E3 of the shell body 13 and the striking plate 25 ddling. Due to the fact that the beads 23, 24 are switched in the direction of the web 14 of the shell body 13, these do not constitute an obstacle in spot welding.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

The manufacturing process involves starting with a plate (1) and deforming it. At least one process groove is made close to at least one edge to form a material reserve. The plate is then deformed in a press tool (8) into the component (9). The groove material is leveled out, moving material towards the outer edge. The end is pressed against a support (19, 20) in the press too, deforming it into a recess (21, 22) to form a bulge (23, 24) at the edge.

Description

Die Erfindung betrifft einerseits ein Verfahren zur Herstellung eines Struktur- oder Fahrwerkbauteils für Kraftfahrzeuge und andererseits ein solches Struktur- oder Fahrwerkbauteil.On the one hand, the invention relates to a method for producing a structural or chassis component for motor vehicles and, on the other hand, to such a structural or chassis component.

Bei hoch beanspruchten Pressbauteilen aus Metallblechen, insbesondere bei im Fahrzeugbau eingesetzten Struktur- oder Fahrwerkbauteilen aus hochfesten Stählen oder Leichtmetallen stellen die Beschnittkanten sehr oft eine Schwachstelle dar, von denen vor allem unter dynamischer Belastung oder im Crashfall Risse ausgehen. Ursachen hierfür sind die betriebsbedingten hohen Belastungen in diesen Kantenbereichen. In den Kantenbereichen entstehen beim mechanischen Beschneiden Gefügeveränderungen und Mikrorisse, welche die Rissanfälligkeit der Struktur- oder Fahrwerkbauteile erhöhen. Gleichzeitig wird die Blechdicke an der Beschnittkante infolge des notwendigen Schneiddrucks reduziert.For highly stressed press components made of metal sheets, especially in structural or chassis components used in vehicle made of high-strength steels or light metals, the trimming edges are very often a weak point from which cracks go out, especially under dynamic load or in the event of a crash. The reasons for this are the operational high loads in these edge areas. In the edge areas, structural changes and micro-cracks occur during mechanical trimming, which increase the susceptibility of the structure or chassis components to cracking. At the same time, the sheet thickness at the trim edge is reduced due to the necessary cutting pressure.

Auch bei thermischen Trennverfahren wird der Kantenbereich in der Regel durch prozessbedingte Kerben im Schnittkantenverlauf und bei hochfesten Stählen auch durch die aus der Wärmeeinwirkung resultierende Endfestigkeit geschwächt.Even in thermal separation processes, the edge area is usually due to process-related notches in the cutting edge course and high-strength Steels also weakened by the final strength resulting from the effect of heat.

Die vorgenannten nachteiligen Einflüsse können nicht nur zum Versagen der fertigen Struktur- oder Fahrwerkbauteile führen, sondern auch bei im Fertigungsprozess nachfolgend auftretenden Beanspruchungen, z.B. durch Aufweiten, Abkanten und ähnliches an den Kantenbereichen Risse oder Einschnürungen verursachen.The aforementioned adverse effects can not only lead to failure of the finished structural or chassis components, but also in subsequent stresses occurring in the manufacturing process, e.g. cause cracks or constrictions at the edges due to expansion, folding and the like.

Zur Beseitigung von Zugspannungen und Mikrorissen an den Längskanten von Torsionsprofilen von Verbundlenkerachsen schlägt die DE 196 42 995 C1 vor, die Längskanten zu stauchen, um hier Druckeigenspannungen zu erzeugen. Durch das Stauchen werden die Oberflächen der Schnittkanten geglättet und vorhandene Mikrorisse kaltverschweißt. In bevorzugter Ausgestaltung sollen bei der DE 196 42 995 C1 zunächst Längsrillen mit kleinem Abstand von den Längskanten in die Platine eingepresst und dabei oder danach die Längskanten gestaucht werden.To eliminate tensile stresses and microcracks on the longitudinal edges of torsion profiles of twist beam axles beats the DE 196 42 995 C1 to compress the longitudinal edges in order to generate residual compressive stresses here. By upsetting the surfaces of the cut edges are smoothed and existing micro-cracks are cold-welded. In a preferred embodiment to be in the DE 196 42 995 C1 first longitudinal grooves are pressed with a small distance from the longitudinal edges in the board and thereby or afterwards the longitudinal edges are compressed.

Der bekannte Vorschlag stellt bereits einen Schritt zur Erhöhung der Lebensdauer einer Verbundlenkerachse bzw. deren Torsionsprofil dar. Grundsätzlich erscheint jedoch die Herstellung von Struktur- oder Fahrwerkbauteilen mit verbesserten Bauteilkanten erstrebenswert.The known proposal already represents a step for increasing the service life of a torsion beam axle or its torsion profile. Basically, however, the production of structural or chassis components with improved component edges seems to be desirable.

Zum technologischen Hintergrund zählt des Weiteren die DE 33 43 709 A1 . Dort wird ein Verfahren zur Herstellung eines Struktur- oder Fahrwerkbauteils in Form eines Rahmenteils für Kraftfahrzeuge beschrieben. Das Rahmenbauteil wird hierzu aus einer Platine in einem Pressenwerkzeug umgeformt mit der Besonderheit, dass dort die Platine partiell abgewalzt wird und somit verschieden dicke Längenabschnitte aufweist.The technological background also includes the DE 33 43 709 A1 , There, a method for producing a structural or chassis component in the form of a frame part for motor vehicles is described. For this purpose, the frame component is formed from a blank in a press tool with the special feature that there the blank is partially rolled off and thus has sections of different thickness.

Der Erfindung liegt ausgehend vom Stand der Technik die Aufgabe zugrunde, ein Verfahren zur Herstellung von Struktur- oder Fahrwerkbauteilen für Kraftfahrzeuge mit verbesserten und genaueren Kanteneigenschaften aufzuzeigen sowie ein hinsichtlich seines Belastungsverhaltens verbessertes Struktur- oder Fahrwerkbauteil zu schaffen.The invention is based on the prior art, the task of demonstrating a method for the production of structural or chassis components for motor vehicles with improved and more accurate edge properties and to create a structure or chassis component which is improved with respect to its load behavior.

Die Lösung des verfahrensmäßigen Teils der Aufgabe besteht in einem Verfahren gemäß Anspruch 1.The solution of the procedural part of the task consists in a method according to claim 1.

Zur Herstellung eines Struktur- oder Fahrwerkbauteils wird eine Platine aus Stahl oder einem Leichtmetall eingesetzt. An der Platine wird eine Materialbevorratung vorgesehen, welche beim Umformvorgang in andere Bereiche des Struktur- oder Fahrwerkbauteils verschoben und umgeformt wird. Die Platine wird beim Umformvorgang zum Struktur- oder Fahrwerkbauteil zumindest an einem Rand gegen ein Widerlager im Pressenwerkzeug gedrückt und die Materialbevorratung in einer Ausnehmung im Pressenwerkzeug umgeformt. Hierduch entsteht am Rand des Struktur- oder Fahrwerkbauteils ein präziser genau definierter Längskantenbereich. Die erfindungsgemäße Vorgehensweise gewährleistet Bauteilkanten mit hoher Qualität, bei denen Mikrorisse zuverlässig kalt verfestigt sind oder warmgestaucht werden. Die Rissanfälligkeit der Struktur- bzw. Fahrwerkbauteile im Randbereich ist deutlich vermindert und insgesamt die Lebensdauer eines erfindungsgemäßen Struktur- oder Fahrwerkbauteils erhöht.To produce a structural or chassis component, a board made of steel or a light metal is used. On the board, a material storage is provided, which is moved and transformed during the forming process in other areas of the structural or chassis component. The board is pressed during the forming process to the structural or chassis component at least at one edge against an abutment in the press tool and formed the material storage in a recess in the press tool. This results in a precise, precisely defined longitudinal edge region on the edge of the structural or chassis component. The procedure according to the invention ensures component edges of high quality, in which microcracks are reliably cold-solidified or hot-pressed. The susceptibility to cracking of the structural or chassis components in the edge region is significantly reduced and overall increases the life of a structural or chassis component according to the invention.

Vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens sind Gegenstand der abhängigen Ansprüche 2 bis 9.Advantageous embodiments of the method according to the invention are the subject of the dependent claims 2 to 9.

Vorzugsweise wird der Rand der Platine im Pressenwerkzeug derart umgeformt, dass am Rand ein Wulst entsteht.Preferably, the edge of the board is formed in the press tool such that a bead is formed at the edge.

Am Struktur- oder Fahrwerkbauteil können ein oder mehrere Wulste erzeugt werden. Erfindungsgemäß ist vorgesehen, dass ein Wulst vor allem in rissgefährdeten oder eng tolerierten Bereichen eines Struktur- bzw. Fahrwerkbauteils angebracht wird.One or more beads can be produced on the structural or chassis component. According to the invention, it is provided that a bead is applied, above all, in regions of a structural or chassis component that are subject to cracking or tight tolerances.

Zur Herstellung eines erfindungsgemäßen Struktur- oder Fahrwerkbauteils kann eine Platine eingesetzt werden, die gegenüber der Abwicklung des Struktur- oder Fahrwerkbauteils ein gewissess Übermaß besitzt, so dass die Platine eine Materialreserve zur Erzeugung eines oder mehrerer Wulste an den Rändern besitzt.To produce a structural or chassis component according to the invention, a circuit board can be used, which has a certain excess compared with the development of the structural or chassis component, so that the Board has a reserve of material to produce one or more beads on the edges.

Durch das erfindungsgemäß vorgeschlagene Verfahren kann auch das sonst oft übliche nachträgliche Beschneiden der Außenkontur der Struktur- oder Fahrwerkbauteile aufgrund von Schwankungen in der Außenkontur entfallen. Durch das gezielte Vorhalten und anschließende Verdrängen von Material in den Bereich der Außenkante mit definierter Formgebung der Ränder werden nachträgliche Beschneideoperationen eingespart. Diese Vorgehensweise bietet sich vor allem bei warmgeformten pressgehärteten Struktur- bzw. Fahrwerkbauteilen an.By the method proposed according to the invention, the otherwise often customary subsequent trimming of the outer contour of the structural or chassis components due to fluctuations in the outer contour can be dispensed with. Due to the targeted provision and subsequent displacement of material in the area of the outer edge with defined shaping of the edges subsequent trimming operations are saved. This procedure is particularly suitable for hot-formed press-hardened structural or chassis components.

Eine besonders vorteilhafte Ausführung des erfindungsgemäßen Verfahrens sieht vor, zunächst zumindest entlang eines Rands der Platine mit geringem Abstand von der Außenkante der Platine eine wellenförmige Materialbevorratung nach Art einer Sicke auszuformen. Die Sicke dient beim Umformvorgang als Materialreserve. Anschließend wird die Platine im Pressenwerkzeug zum Struktur- bzw. Fahrwerkbauteil umgeformt. Hierbei wird die Materialbevorratung im Pressenwerkzeug unter Materialverdrängung in Richtung zur Außenkante eingeebnet, so dass am Rand der Wulst entsteht.A particularly advantageous embodiment of the method according to the invention provides, initially at least along an edge of the board at a small distance from the outer edge of the board to form a wavy material storage in the manner of a bead. The bead serves as a material reserve during the forming process. Subsequently, the board is formed in the press tool for structural or chassis component. Here, the material storage is leveled in the press tool under material displacement in the direction of the outer edge, so that arises at the edge of the bead.

Die Materialbevorratung kann gleichzeitig mit dem Schneiden der Platine in einem Folgewerkzeug ohne separaten Arbeitsgang eingebracht werden.The material storage can be introduced simultaneously with the cutting of the board in a subsequent tool without a separate operation.

Für die Praxis wird es ferner als zweckmäßig angesehen, die Wulst am Rand in eine Richtung quer zur Längserstreckung des Rands umzustellen. Die Materialbevorratung wird zweckmäßierweise in Bereiche des Struktur- oder Fahrwerkbauteils verdrängt, in denen eine Wulstbildung die Weiterverarbeitung des Struktur- oder Fahrwerkbauteils nicht behindert. Grundsätzlich kann der Rand auch mit Ausnehmungen und als Lochrand ausgeführt sein. Die Platine bzw. das Struktur- oder Fahrwerkbauteil kann Durchbrechungen, beispielsweise Löcher oder ähnliche Ausnehmungen aufweisen, welche beim Umformvorgang im Pressenwerkzeug auf Toleranz endgeformt werden. Hierbei kann der Rand der Durchbrechungen auch mit einem Wulst versehen werden.In practice, it is also considered desirable to change the bead at the edge in a direction transverse to the longitudinal extent of the edge. The material storage is expediently displaced into areas of the structural or chassis component in which a bead formation does not hinder the further processing of the structural or chassis component. In principle, the edge can also be designed with recesses and as a hole edge. The circuit board or the structural or chassis component may have perforations, for example holes or similar recesses, which are finally shaped to tolerance during the forming process in the press tool. Here, the edge of the openings can also be provided with a bead.

Des Weiteren kann der Rand über das Widerlager auf Toleranz geformt werden. Auf diese Weise wird ein tiefgezogener Rand erzeugt, der innerhalb der erlaubten Toleranzen liegt und der nicht mehr geschnitten werden braucht. Auch hierdurch können Mikrorisse verhindert werden.Furthermore, the edge can be formed over tolerance on the abutment. In this way, a deep-drawn edge is created, which is within the tolerances allowed and no longer needs to be cut. This also microcracks can be prevented.

Beim erfindungsgemäßen Verfahren kann das Struktur- bzw. Fahrwerkbauteil sowohl warm als auch kalt umgeformt werden. Beim Warmumformen kann vorteilhaft eine zumindest partielle Härtung des Struktur- bzw. Fahrwerkbauteils im Pressenwerkzeug vorgenommen werden.In the method according to the invention, the structure or chassis component can be formed both warm and cold. During hot forming, advantageously at least partial hardening of the structural or chassis component in the press tool can be carried out.

Die Lösung des gegenständlichen Teils der Aufgabe besteht in einem Struktur- oder Fahrwerkbauteil gemäß Anspruch 10.The solution of the objective part of the task consists in a structural or chassis component according to claim 10.

Das Struktur- bzw. Fahrwerkbauteil umfasst einen Schalenkörper hergestellt nach dem erfindungsgemäßen Verfahren. Der Schalenkörper besitzt einen U-oder V-förmigen Querschnitt mit einem Steg und zwei Schenkeln, wobei sich endseitig an die Schenkel vorzugsweise nach außen gerichtete Flansche anschließen. Jeweils am freien Ende der Flansche erstreckt sich eine Wulst entlang des Bauteilrands. Diese Wulst steht in Richtung zum Steg gegenüber dem Flansch vor. Zur Komplettierung ist der Schalenkörper durch ein Schließblech verschlossen, welches jeweils an den Flanschen mit dem Schalenkörper gefügt ist. Die Fügung erfolgt an der der Wulst gegenüber liegenden ebenen Seite der Flansche, so dass ebene Kontaktflächen der Flansche und des Schließblechs aneinander gelegt und gefügt werden. Die Wulste stellen somit beim Fügen, insbesondere beim Punktverschweißen, kein Hindernis dar.The structural or chassis component comprises a shell body produced by the method according to the invention. The shell body has a U-shaped or V-shaped cross-section with a web and two legs, with the ends preferably connected to the legs outwardly directed flanges. Each at the free end of the flanges, a bead extends along the edge of the component. This bead protrudes toward the bridge opposite the flange. To complete the shell body is closed by a strike plate, which is joined at each of the flanges with the shell body. The joining takes place at the flat side of the flanges lying opposite the bead so that flat contact surfaces of the flanges and the striking plate are placed against one another and joined. The beads thus do not present an obstacle during joining, in particular during spot welding.

Das erfindungsgemäße Struktur- oder Fahrwerkbauteil ist sowohl statisch als auch dynamisch hoch belastbar und weist eine deutlich geringere Anfälligkeit gegen Rissausbildung an den Bauteilkanten auf.The structure or chassis component according to the invention is highly resilient both statically and dynamically and has a significantly lower susceptibility to crack formation at the component edges.

Die Erfindung ist nachfolgend anhand von Zeichnungen beschrieben. Es zeigen:

Figur 1
in einem Querschnitt eine Platine zur Herstellung eines Struktur- oder Fahrwerkbauteils;
Figur 2
die Platine mit beidseitig angeformten Materialbevorratungen;
Figuren 3a-3c
den Umformvorgang der Platine in drei Stufen;
Figur 4
in perspektivischer Darstellungsweise einen Ausschnitt aus einem erfindungsgemäßen Struktur- oder Fahrwerkbauteil und
Figur 5
die Darstellung gemäß der Figur 4 in einer Stirnansicht.
The invention is described below with reference to drawings. Show it:
FIG. 1
in a cross section, a board for producing a structural or chassis component;
FIG. 2
the board with both sides molded material stocks;
FIGS. 3a-3c
the forming process of the board in three stages;
FIG. 4
in perspective representation, a section of a structure or chassis component according to the invention and
FIG. 5
the representation according to the figure 4 in an end view.

Figur 1 zeigt eine Platine 1 aus Stahl oder einem Leichtmetall. Diese ist von einem Coil abgeteilt und gegebenenfalls mittels einer Schneideoperation vorkonfektioniert worden. Die Platine 1 dient zur Herstellung eines Struktur- oder Fahrwerkbauteils für Kraftfahrzeuge.Figure 1 shows a circuit board 1 made of steel or a light metal. This has been separated from a coil and optionally pre-assembled by means of a cutting operation. The circuit board 1 is used to produce a structural or chassis component for motor vehicles.

Zunächst wird entlang der beiden äußeren Ränder 2, 3 der Platine 1 mit geringem Abstand von der jeweiligen Außenkante 4, 5 eine wellenförmige Materialbevorratung 6, 7 nach Art einer Sicke ausgeformt. Die Materialbevorratungen 6, 7 können beim Beschneiden der Platine 1 in einem Folgewerkzeug hergestellt werden.First, along the two outer edges 2, 3 of the board 1 at a small distance from the respective outer edge 4, 5, a wavy material storage 6, 7 formed in the manner of a bead. The material stores 6, 7 can be produced when trimming the board 1 in a follower tool.

Die mit den Materialbevorratungen 6, 7 versehene Platine 1 wird dann in einem Pressenwerkzeug 8, wie in der Figur 3 dargestellt, zu einem Struktur- oder Fahrwerkbauteil 9 umgeformt (siehe auch Figuren 4 und 5). Bei dem Pressenwerkzeug 8 kann es sich um ein Kaltumform- oder ein Warmumformwerkzeug handeln.The board 1 provided with the material stores 6, 7 is then converted into a structural or chassis component 9 in a press tool 8, as shown in FIG. 3 (see also FIGS. 4 and 5). The press tool 8 may be a cold forming or a hot forming tool.

Das Pressenwerkzeug 8 umfasst ein Oberwerkzeug 10 und ein Unterwerkzeug 11, zwischen denen beim Umformvorgang ein Formraum 12 ausgebildet wird.The pressing tool 8 comprises an upper tool 10 and a lower tool 11, between which a forming space 12 is formed during the forming process.

Die Platine 1 wird in das Pressenwerkzeug eingelegt und das Oberwerkzeug 10 und das Unterwerkzeug 11 relativ zueinander verlagert (Figur 3a). Beim weiteren Zusammenfahren des Pressenwerkzeugs 8, wie in Figur 3b) dargestellt, wird ein Schalenkörper 13 mit einem U-förmigen Querschnitt ausgebildet, der einen Steg 14 sowie zwei Schenkel 15, 16 aufweist, an welche sich endseitig jeweils nach außen gerichtete Flansche 17, 18 anschließen.The circuit board 1 is inserted into the press tool and the upper tool 10 and the lower tool 11 are displaced relative to each other (Figure 3a). During further movement of the pressing tool 8, as shown in Figure 3b), a shell body 13 is formed with a U-shaped cross-section, which has a web 14 and two legs 15, 16, to which each end facing outward flanges 17, 18th connect.

Mit fortschreitendem Pressenhub bis in die Endlage (Figur 3c) werden die Materialbevorratungen 6, 7 unter Materialverdrängung in Richtung zu den Außenkanten 4, 5 eingeebnet. Hierbei werden die Ränder 2, 3 der Platine 1 jeweils gegen ein Widerlager 19, 20 im Unterwerkzeug 11 des Pressenwerkzeugs 8 gedrückt und in eine Ausnehmung 21, 22 im Oberwerkzeug 10 des Pressenwerkzeugs 8 umgeformt, so dass an den Rändern 2, 3 jeweils ein Wulst 23, 24 entsteht.As the press stroke progresses as far as the end position (FIG. 3c), the material supplies 6, 7 are leveled with material displacement in the direction of the outer edges 4, 5. Here, the edges 2, 3 of the board 1 are each pressed against an abutment 19, 20 in the lower tool 11 of the press tool 8 and formed into a recess 21, 22 in the upper tool 10 of the press tool 8, so that at the edges 2, 3 each have a bead 23, 24 arises.

Anhand der Figur 3c) erkennt man, dass die Wulste 23, 24 quer zur Längserstreckung der Ränder 2, 3 in eine Richtung umgestellt werden, so dass die Wulste 23, 24 in Richtung zum Steg 14 gegenüber den Flanschen 17, 18 vorstehen.It can be seen on the basis of FIG. 3c) that the beads 23, 24 are changed over in a direction transverse to the longitudinal extent of the edges 2, 3, so that the beads 23, 24 protrude in the direction of the web 14 with respect to the flanges 17, 18.

Die Wulste 23, 24 stellen definierte Längskantenbereiche entlang der Ränder 2, 3 am Struktur- oder Fahrwerkbauteil 9 sicher mit geringer Rissanfälligkeit und hoher Maßgenauigkeit. Nachträgliche Beschneideoperationen entlang der Ränder 2, 3 am Struktur- oder Fahrwerkbauteil 9 können entfallen.The beads 23, 24 provide defined longitudinal edge areas along the edges 2, 3 on the structural or chassis component 9 safely with low susceptibility to cracking and high dimensional accuracy. Subsequent trimming operations along the edges 2, 3 on the structural or chassis component 9 can be omitted.

Die Figuren 4 und 5 zeigen einen Ausschnitt aus dem Schalenkörper 13 eines erfindungsgemäßen Struktur- oder Fahrwerkbauteils 9. Der Schalenkörper 13 ist durch ein Schließlech 25 verschlossen, welches jeweils auf der den Wulsten 23, 24 gegenüber liegenden ebenen Seite 26, 27 der Flansche 17, 18 mit dem Schalenkörper 13 gefügt ist. Mit E1 und E2 sind in den Figuren 4 und 5 Schweißelektroden bezeichnet. Über die Schweißelektroden E1 und E3 werden der Schalenkörper 13 und das Schließblech 25 punktverschweit. Aufgrund der Tatsache, dass die Wulste 23, 24 in Richtung zum Steg 14 des Schalenkörpers 13 umgestellt sind, stellen diese kein Hindernis beim Punktverschweißen dar.FIGS. 4 and 5 show a section of the shell body 13 of a structural or chassis component 9 according to the invention. The shell body 13 is closed by a closing plate 25, which in each case lies on the flat side 26, 27 of the flanges 17 opposite the beads 23, 24. 18 is joined to the shell body 13. With E1 and E2 are designated in Figures 4 and 5 welding electrodes. About the welding electrodes E1 and E3 of the shell body 13 and the striking plate 25 punktverschweit. Due to the fact that the beads 23, 24 are switched in the direction of the web 14 of the shell body 13, these do not constitute an obstacle in spot welding.

Bezugszeichen:Reference numerals:

1 -1 -
Platinecircuit board
2 -2 -
Randedge
3 -3 -
Randedge
4 -4 -
Außenskanteouter edge
5 -5 -
Außenkanteouter edge
6 -6 -
Materialbevorratungmaterial storage
7 -7 -
Materialbevorratungmaterial storage
8 -8th -
PressenwerkzeugPress tool
9 -9 -
Struktur- oder FahrwerkbauteilStructure or chassis component
10 -10 -
Oberwerkzeugupper tool
11 -11 -
Unterwerkzeuglower tool
12 -12 -
Formraumcavity
13 -13 -
Schalenkörpershell body
14 -14 -
Stegweb
15 -15 -
Schenkelleg
16 -16 -
Schenkelleg
17 -17 -
Flanschflange
18 -18 -
Flanschflange
19 -19 -
Widerlagerabutment
20 -20 -
Widerlagerabutment
21 -21 -
Ausnehmungrecess
22 -22 -
Ausnehmungrecess
23 -23 -
Wulstbead
24 -24 -
Wulstbead
25 -25 -
Schließblechstriking plate
26 -26 -
untere Seite v. 17lower side v. 17
27 -27 -
untere Seite v. 18lower side v. 18
E1 -E1 -
Elektrodeelectrode
E2 -E2 -
Elektrodeelectrode

Claims (10)

Verfahren zur Herstellung eines Struktur- oder Fahrwerkbauteils für Kraftfahrzeuge aus einer Platine (1), die in einem Pressenwerkzeug (8) zum Struktur- oder Fahrwerkbauteil umgeformt wird, dadurch gekennzeichnet, dass die Platine (1) wenigstens eine Materialbevorratung (6, 7) aufweist und zumindest ein Rand (2, 3) beim Umformvorgang gegen ein Widerlager (19, 20) im Pressenwerkzeug (8) gedrückt und die Materialbevorratung (6, 7) in den Rand (2, 3) und in eine Ausnehmung (21, 22) im Pressenwerkzeug (8) umgeformt wird.Method for producing a structural or chassis component for motor vehicles from a circuit board (1), which is converted into a structural or chassis component in a press tool (8), characterized in that the circuit board (1) has at least one material supply (6, 7) and at least one edge (2, 3) during the forming process against an abutment (19, 20) pressed in the press tool (8) and the material storage (6, 7) in the edge (2, 3) and in a recess (21, 22) in the press tool (8) is formed. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Rand (2, 3) im Pressenwerkzeug derart umgeformt wird, dass am Rand (2, 3) ein Wulst (23, 24) entsteht.A method according to claim 1, characterized in that the edge (2, 3) is formed in the press tool such that at the edge (2, 3), a bead (23, 24) is formed. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass zunächst zumindest entlang einem Rand (2, 3) der Platine (1) mit Abstand von der Außenkante (4, 5) der Platine (1) eine wellenförmige Materialbevorratung (6, 7) ausgeformt wird und die Platine (1) anschließend im Pressenwerkzeug (8) umgeformt wird, wobei die Material bevorratung (6, 7) im Pressenwerkzeug (8) unter Materialverdrängung in Richtung zur Außenkante (4, 5) eingeebnet wird, so dass am Rand (2, 3) der Wulst (23, 24) entsteht.A method according to claim 2, characterized in that initially at least along one edge (2, 3) of the board (1) at a distance from the outer edge (4, 5) of the board (1) a wave-shaped material storage (6, 7) is formed and the board (1) is then formed in the press tool (8), wherein the material storage (6, 7) in the press tool (8) with material displacement in the direction of the outer edge (4, 5) is leveled, so that at the edge (2, 3 ) of the bead (23, 24) is formed. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass der Wulst (23, 24) am Rand (2, 3) in eine Richtung umgestellt wird.A method according to claim 2 or 3, characterized in that the bead (23, 24) at the edge (2, 3) is changed in one direction. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Struktur- oder Fahrwerkbauteil im Pressenwerkzeug (8) warm umgeformt und zumindest partiell gehärtet wird.Method according to one of claims 1 to 4, characterized in that the structural or chassis component in the press tool (8) is hot formed and at least partially cured. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Struktur- oder Fahrwerkbauteil im Pressenwerkzeug (8) kalt umgeformt wird.Method according to one of claims 1 to 4, characterized in that the structural or chassis component in the press tool (8) is cold formed. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass beim Umformvorgang Durchbrechungen im Struktur- oder Fahrwerkbauteil auf Toleranz endgeformt werden.Method according to one of claims 1 to 6, characterized in that the forming process perforations in the structure or chassis component are finally formed to tolerance. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Materialbevorratung in Bereiche des Struktur- oder Fahrwerkbauteils verdrängt wird, in denen eine Wulstbildung die Weiterverarbeitung des Struktur- oder Fahrwerkbauteils nicht behindert.Method according to one of claims 1 to 7, characterized in that the material storage is displaced into areas of the structural or chassis component, in which a bead formation does not hinder the further processing of the structural or chassis component. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der Rand über das Widerlager auf Toleranz geformt wird.Method according to one of claims 1 to 8, characterized in that the edge is formed over the abutment on tolerance. Struktur- oder Fahrwerkbauteil mit einem Schalenkörper (13) hergestellt nach einem Verfahren gemäß einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der Schalenkörper (13) einen U- oder V-förmigen Querschnitt mit einem Steg (14), zwei Schenkeln (15, 16) und sich endseitig an die Schenkel (15, 16) anschließenden Flanschen (17, 18) aufweist, wobei sich jeweils am freien Ende der Flansche (17, 18) ein Wulst (23, 24) erstreckt, welcher in Richtung zum Steg (14) gegenüber dem Flansch (17, 18) vorsteht und der Schalenkörper (13) durch ein Schließblech (25) verschlossen ist, welches jeweils an den Flanschen (17, 18) mit dem Schalenkörper (13) gefügt ist.Structural or chassis component with a shell body (13) produced by a method according to one of claims 1 to 9, characterized in that the shell body (13) has a U- or V-shaped cross section with a web (14), two legs (15 , 16) and at the ends of the legs (15, 16) adjoining flanges (17, 18), wherein in each case at the free end of the flanges (17, 18) a bead (23, 24) extending, which in the direction of the web (14) with respect to the flange (17, 18) protrudes and the shell body (13) is closed by a striking plate (25), which is in each case at the flanges (17, 18) joined to the shell body (13).
EP07000296A 2006-02-08 2007-01-09 Method for manufacturing a structural or chassis element for motor vehicles Not-in-force EP1818115B1 (en)

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DE102006005964A DE102006005964B3 (en) 2006-02-08 2006-02-08 Manufacturing process for vehicle component involves making process groove in plate and pressing at least one edge against support to press out groove later

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CN101648245B (en) * 2008-08-13 2011-04-13 王勇 Method for manufacturing aluminum pot
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JP5965159B2 (en) * 2012-02-22 2016-08-03 東プレ株式会社 Molding method for press parts
FR2993806B1 (en) * 2012-07-26 2015-02-13 Saint Jean Ind PROCESS FOR MANUFACTURING STRUCTURE PARTS OF LIGHT ALLOY AND PARTS THUS OBTAINED FOR OPTIMIZING THE MASS / PERFORMANCE RATIO
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DE502007000469D1 (en) 2009-04-16
ATE424266T1 (en) 2009-03-15
ES2322623T3 (en) 2009-06-23
EP1818115B1 (en) 2009-03-04
US7748743B2 (en) 2010-07-06
DE102006005964B3 (en) 2007-07-19

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