WO2005053871A1 - Method for producing a hollow profile - Google Patents

Method for producing a hollow profile Download PDF

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Publication number
WO2005053871A1
WO2005053871A1 PCT/EP2004/012692 EP2004012692W WO2005053871A1 WO 2005053871 A1 WO2005053871 A1 WO 2005053871A1 EP 2004012692 W EP2004012692 W EP 2004012692W WO 2005053871 A1 WO2005053871 A1 WO 2005053871A1
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WO
WIPO (PCT)
Prior art keywords
hollow profile
sheet
structural elements
high pressure
forming tool
Prior art date
Application number
PCT/EP2004/012692
Other languages
German (de)
French (fr)
Inventor
Helmut Augustin
Stephan HÖFIG
Volker Thoms
Original Assignee
Daimlerchrysler 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
Application filed by Daimlerchrysler Ag filed Critical Daimlerchrysler Ag
Priority to DE502004004916T priority Critical patent/DE502004004916D1/en
Priority to EP04797759A priority patent/EP1708832B1/en
Priority to CA002548271A priority patent/CA2548271A1/en
Publication of WO2005053871A1 publication Critical patent/WO2005053871A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/02—Making hollow objects characterised by the structure of the objects
    • B21D51/12—Making hollow objects characterised by the structure of the objects objects with corrugated walls
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/021—Deforming sheet bodies
    • B21D26/031—Mould construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/053—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure characterised by the material of the blanks

Definitions

  • the process of hydroforming serves to produce hollow or shell profiles, in particular from sheet metal.
  • a sheet metal blank is formed into a half-shell or two sheet metal blanks lying one on top of the other, which are welded at the edges, are expanded to form a hollow profile.
  • IHU internal high pressure forming
  • This maximum permissible change in circumference is in turn defined by the maximum elongation at break of the material used for the component and the position of the molding itself.
  • the maximum he determines Adequate shaping in hydroforming, on the one hand, by the maximum permissible change in circumference and, on the other hand, by the original scope of the starting material.
  • the invention relates to a method for producing a hollow profile, which is formed from at least one sheet by high pressure fluid. Before the shaping, the surface of the sheet is provided with structural elements in the form of depressions and / or elevations.
  • the method according to the invention is distinguished by the advantage that an increase in the achievable shape of a component produced, for example, with IHU can make it more constructive in terms of its later use, in particular with regard to the stiffness and strength properties, for example in relation to the force absorption capacity, because in connection with the work hardening of the material due to the process of internal high pressure forming, such structured profiles are easier to realize.
  • the method according to the invention can be used, in particular, to produce carriers for the body of a motor vehicle which correspond to a high degree to the requirements of lightweight construction.
  • the contour of the structural elements in the form of depressions and / or elevations is optional.
  • During their manufacture which is accomplished, for example, by stamping or rolling the sheet metal surface, it only has to be ensured that the material stretching in the edge regions of the structural elements is kept to a minimum.
  • the insertion profile of the component to be formed that is to say the contour of the sheet, is therefore wel ches is inserted into the forming tool before expanding, equipped with an enlarged circumference due to the presence of structural elements.
  • This enlarged scope effectively provides a deformation reserve through a larger effective surface.
  • the novel design of the sheet with structural elements that is used also allows that when the sheet is inserted into the forming tool, at least some of the structural elements to the inside surface of the forming tool partially form cavities for receiving a lubricant, which keeps the friction between the inside surface and the sheet low , This also results in an increase in the maximum permissible change in circumference.
  • FIG. 1 shows an example of the section of a sheet which is to be used in the method according to the invention.
  • the sheet 1 is then subsequently bent to form, for example, a rotationally symmetrical tubular hollow semi-finished product and welded to the butt surfaces along a longitudinal seam to form this hollow profile semi-finished product, so that structural elements 2 in the form of such bulges are provided over the entire circumference of the hollow profile semi-finished product.
  • the hollow profile semi-finished product is then expanded to the hollow profile by means of internal high pressure in an internal high pressure forming tool.
  • the hollow profile semi-finished product is formed into a hollow profile after the longitudinal seam welding in an external high-pressure forming tool by the interaction of a fluidic high pressure directed inwards from the outside with a die introduced into the interior of the hollow profile semi-finished product, the semi-finished product being true to contour is pressed onto the die, which forms the shape and contour of the hollow profile.

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

Abstract

The invention relates to a method for producing a hollow profile using a metal forming method under high fluidic pressure. According to said method, the surface of sheet metal is specifically provided with structural elements (2), which increase the maximum moulding degree of the component in the subsequent hydroforming process.

Description

Verfahren zur Herstellung eines Hohlprofils Process for producing a hollow profile
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines Hohlprofils, insbesondere ein Innenhochdruck-Umformverfahren, nach dem Oberbegriff des Anspruchs 1.The present invention relates to a method for producing a hollow profile, in particular an internal high-pressure forming method, according to the preamble of claim 1.
Das Verfahren des Innenhochdruckumformens dient dazu, Hohl- oder Schalenprofile insbesondere aus Blech herzustellen. Hierbei wird entweder eine Blechplatine zu einer Halbschale umgeformt oder es werden zwei aufeinander liegende Blechplatinen, die randseitig verschweißt sind, zu einem Hohl- profil aufgeweitet. Es ist auch gängige Praxis, ein zu einem Hohlprofil gebogenes Blech, welches entlang einer Längsnaht verschweißt wird, in ein Innenhochdruckumform- (IHU) -Werkzeug einzulegen, um dann mittels eines Fluids einen Innenhochdruck in das Hohlprofil einzubringen, wodurch das Hohlprofil dann auseinander getrieben wird und sich an die Kontur des IHU-Werkzeugs formgetreu anlegt.The process of hydroforming serves to produce hollow or shell profiles, in particular from sheet metal. In this case, either a sheet metal blank is formed into a half-shell or two sheet metal blanks lying one on top of the other, which are welded at the edges, are expanded to form a hollow profile. It is also common practice to insert a sheet metal bent into a hollow profile, which is welded along a longitudinal seam, into an internal high pressure forming (IHU) tool in order to then apply an internal high pressure to the hollow profile by means of a fluid, which then drives the hollow profile apart and conforms to the contour of the IHU tool.
Die erzielbare Bauteilgeometrie bei durch Innenhochdruck umgeformten Bauteilen bestimmt sich in hohem Maße durch die maximale Umfangsanderung, welche das Bauteil während des Innenhochdruckumformens erfahren kann.The achievable component geometry in the case of components formed by internal high pressure is largely determined by the maximum circumferential change which the component can experience during internal high pressure forming.
Diese maximal zulässige Umfangsanderung wiederum wird durch die maximale Bruchdehnung des für das Bauteil zum Einsatz kommenden Materials und die Lage der Ausformung selbst definiert . Mit anderen Worten bestimmt sich die maximal er reichbare Ausformung beim Innenhochdruckumformen einerseits durch die maximal zulässige Umfangsänderung sowie andererseits durch den Ursprungsumfang des Ausgangsmaterials.This maximum permissible change in circumference is in turn defined by the maximum elongation at break of the material used for the component and the position of the molding itself. In other words, the maximum he determines Adequate shaping in hydroforming, on the one hand, by the maximum permissible change in circumference and, on the other hand, by the original scope of the starting material.
Kommen als Ausgangsmaterial beispielsweise glatte, längsnahtgeschweißte Rohre oder Hohlprofile zum Einsatz, wird die Abmessung bzw. der Durchmesser der Profile bzw. der Rohre über den minimalen Bauteilumfang festgelegt, derart, dass in allen Bereichen des Bauteils während des Umformens eine plastische Formänderung erreicht wird.If, for example, smooth, longitudinally welded tubes or hollow profiles are used, the dimension or diameter of the profiles or tubes is determined via the minimum component circumference in such a way that a plastic change in shape is achieved in all areas of the component during forming.
Bei der Herstellung derartiger Produkte mittels des Innenhochdruckumformens ist es jedoch als nachteilig anzusehen, dass bei einer hohen Zahl der Anwendungsfälle die maximal erreichbare Ausformung zu annähernd 100 % ausgenutzt wird, was eine hohe, erhebliche Kosten verursachende Ausschuss- quote zur Folge hat .In the production of such products by means of hydroforming, however, it is to be regarded as a disadvantage that the maximum achievable shape is used to an almost 100% extent in a large number of applications, which results in a high reject rate which causes considerable costs.
Im Bereich des Automobilbaus ist es wünschenswert, dass Strukturbauteile hohen Anforderungen sowohl in Bezug auf Festigkeit als auch in Bezug auf Steifigkeit gerecht werden. Darüber hinaus besteht ein erhebliches Interesse daran, Leichtbaukonzepte im Fahrzeugbau zu verwirklichen und daher das Gewicht dieser Teile so weit wie irgend möglich zu reduzieren.In the field of automotive engineering, it is desirable that structural components meet high requirements both in terms of strength and in terms of rigidity. In addition, there is considerable interest in realizing lightweight construction concepts in vehicle construction and therefore reducing the weight of these parts as much as possible.
Dies wird in der Regel dadurch bewerkstelligt, dass bei gleichzeitiger Gewichtsreduktion als Ausgangsmaterial dünne Bleche aus hochfesten Stählen verwendet werden, welche eine vergleichbare Festigkeit wie dickere Bleche aus herkömmlichen Stählen aufweisen. Die geforderte Steifigkeit wird dann jedoch über steifigkeitserhöhende Strukturen, wie beispielsweise Erhöhungen bzw. Aufwölbungen und/oder Vertiefungen in der Oberfläche des Bauteils zumindest in solchen Bereichen, die später im Einsatz einer erhöhten Belastung ausgesetzt sind, bewerkstelligt.This is usually accomplished by using thin sheets of high-strength steels with a reduction in weight as the starting material, which have a strength comparable to that of thicker sheets of conventional steels. However, the required stiffness is then achieved by means of structures that increase stiffness, such as, for example, elevations or bulges and / or depressions in the surface of the component, at least in such Areas that are later exposed to increased stress in use.
Aus diversen fertigungs- und konstruktionstechnischen Gründen ist es jedoch auch gewünscht, mittels des Innenhoch- druckumformens strukturierte Profile für komplexere Produkte als bisher herzustellen, die insbesondere auch den Anforderungen des Leichtbaus entsprechen. Hier stehen insbesondere die Rahmenstrukturbauteile der Karosserie im Vordergrund des Interesses.For various manufacturing and construction reasons, however, it is also desirable to use structured internal pressure forming to produce structured profiles for more complex products than previously, which in particular also meet the requirements of lightweight construction. Here, in particular, the frame structure components of the body are in the foreground of interest.
Ausgehend davon ist es die Aufgabe der vorliegenden Erfindung, komplexer gestaltete Bauteile mittels des Verfahrens des Innenhochdruckumformens herzustellen, welche die notwendigen Eigenschaften hinsichtlich Festigkeit und Steifigkeit aufweisen, ohne dass dabei die maximal erreichbare Ausformung mit damit einhergehendem erhöhten Ausschuss vollständig ausgenutzt werden muss.Based on this, it is the object of the present invention to produce more complex components by means of the process of hydroforming, which have the necessary properties with regard to strength and rigidity, without having to fully utilize the maximum achievable shape with the associated increased rejects.
Gelöst wird diese Aufgabe mit den Merkmalen des Patentanspruchs 1.This object is achieved with the features of patent claim 1.
Demzufolge betrifft die Erfindung ein Verfahren zur Herstellung eines Hohlprofiles, wobei dieses aus zumindest einem Blech durch fluidischen Hochdruck ausgeformt wird. Vor der Ausformung wird die Oberfläche des Blechs mit Strukturelementen in Form von Vertiefungen und/oder Erhöhungen versehen.Accordingly, the invention relates to a method for producing a hollow profile, which is formed from at least one sheet by high pressure fluid. Before the shaping, the surface of the sheet is provided with structural elements in the form of depressions and / or elevations.
Zur Ausbildung eines derart wölbstrukturierten Blechs werden gemäß der Erfindung die Anzahl, die Dimensionen und die Konturen der Strukturelemente gezielt festgelegt in Abhängigkeit der zu erzielenden Eigenschaften des so herzustellenden Bauteils, so dass bei der abschließenden Beaufschla gung mit fluidischem Hochdruck die für das Bauteil maximal zulässige Umfangsänderung beibehalten und die maximale Ausformung erhöht wird.To form such a sheet-like structure, according to the invention, the number, the dimensions and the contours of the structural elements are specifically determined as a function of the properties to be achieved of the component to be produced, so that in the final application fluidic high pressure maintain the maximum permissible circumferential change for the component and the maximum shape is increased.
Ein derartiges Verhältnis gestattet auch ein Innenhochdruckumformen, bei welchem die maximale Ausformung beibehalten wird, sodass die Umfangsänderung, falls dies gewünscht ist, herabsetzbar ist.Such a ratio also permits hydroforming, in which the maximum shape is maintained, so that the change in circumference, if so desired, can be reduced.
Das erfindungsgemäße Verfahren zeichnet sich durch den Vorteil aus, dass über eine Erhöhung der erreichbaren Ausformung eines beispielsweise mit IHU hergestellten Bauteils dieses hinsichtlich seiner späteren Verwendung, insbesondere was die Steifigkeits- und Festigkeitseigenschaften beispielsweise in Bezug auf die Kraftaufnahmefähigkeit betrifft, konstruktiv günstiger ausgestaltet werden kann, da in Verbindung mit der beim Innenhochdruckumformen verfahrensbedingten Kaltverfestigung des Materials derartig strukturierte Profile leichter zu realisieren sind.The method according to the invention is distinguished by the advantage that an increase in the achievable shape of a component produced, for example, with IHU can make it more constructive in terms of its later use, in particular with regard to the stiffness and strength properties, for example in relation to the force absorption capacity, because in connection with the work hardening of the material due to the process of internal high pressure forming, such structured profiles are easier to realize.
Beispielsweise lassen sich mit dem erfindungsgemäßen Verfahren insbesondere Träger für die Karosserie eines Kraftfahrzeugs herstellen, die in einem hohen Maße den Anforderungen des Leichtbaus entsprechen.For example, the method according to the invention can be used, in particular, to produce carriers for the body of a motor vehicle which correspond to a high degree to the requirements of lightweight construction.
Die Kontur der Strukturelemente in Form von Vertiefungen und/oder Erhöhungen ist im Prinzip wahlfrei. Bei deren Herstellung, welche beispielsweise durch Prägen oder Walzen der Blechoberfläche bewerkstelligt wird, muss lediglich sichergestellt werden, dass die Materialabstreckung in den Randbereichen der Strukturelemente minimal gehalten wird.In principle, the contour of the structural elements in the form of depressions and / or elevations is optional. During their manufacture, which is accomplished, for example, by stamping or rolling the sheet metal surface, it only has to be ensured that the material stretching in the edge regions of the structural elements is kept to a minimum.
Gemäß der Erfindung wird also das Einlegeprofil des umzuformenden Bauteils, das heißt die Kontur des Bleches, wel ches in das Umformwerkzeug vor dem Aufweiten eingelegt wird, durch das Vorhandensein von Strukturelementen mit einem vergrößerten Umfang ausgestattet . Dieser vergrößerte Umfang stellt quasi eine Verformungsreserve durch eine größere effektive Oberfläche zur Verfügung.According to the invention, the insertion profile of the component to be formed, that is to say the contour of the sheet, is therefore wel ches is inserted into the forming tool before expanding, equipped with an enlarged circumference due to the presence of structural elements. This enlarged scope effectively provides a deformation reserve through a larger effective surface.
In diesem Zusammenhang lässt sich auch beim Umformen mit fluidischem Hochdruck in den Bereichen mit einem geringeren Umfang des Bauteils dann eine höhere Kaltverfestigung erzielen.In this context, a higher work hardening can then also be achieved when forming with fluidic high pressure in the areas with a smaller circumference of the component.
Es ist bekannt, dass eine weitere Einflussgröße insbesondere auf den IHU-Prozess die Reibung zwischen dem Werkstück und dem Umformwerkzeug während des Umformvorganges darstellt. Bisher wurde unter anderem versucht, diese durch eine entsprechende Beschichtung der Oberfläche des Aus- gangsmaterials so gering wie möglich zu halten.It is known that a further influencing variable, in particular on the hydroforming process, is the friction between the workpiece and the forming tool during the forming process. So far, attempts have been made, among other things, to keep this as low as possible by appropriate coating of the surface of the starting material.
Die neuartige Ausgestaltung des zur Anwendung kommenden Bleches mit Strukturelementen ermöglicht darüber hinaus, dass beim Einlegen des Bleches in das Umformwerkzeug zumindest einige der Strukturelemente zu der Innenoberfläche des Umformwerkzeugs teilweise Hohlräume zur Aufnahme eines Schmierstoffes ausbilden, welcher die Reibung zwischen der Innenoberfläche und dem Blech gering hält. Auch hieraus resultiert eine Erhöhung der maximal zulässigen Umfangsänderung.The novel design of the sheet with structural elements that is used also allows that when the sheet is inserted into the forming tool, at least some of the structural elements to the inside surface of the forming tool partially form cavities for receiving a lubricant, which keeps the friction between the inside surface and the sheet low , This also results in an increase in the maximum permissible change in circumference.
Je nach Einsatz des herzustellenden Bauteils kann es gewünscht sein, in denjenigen Bereichen des Bauteils, welche einer erhöhten Belastung ausgesetzt sind, die Strukturelemente beizubehalten, welche im fertig gestellten Bauteil eine erhöhte Steifigkeit bewirken. Zu diesem Zweck werden die Strukturelemente beim Umformen des Bleches zum Hohlpro fil auf der Oberfläche des Blechs zumindest teilweise beibehalten, was durch eine entsprechende Konturgestaltung der Innenoberfläche des Umformwerkzeugs bewerkstelligt werden kann.Depending on the use of the component to be manufactured, it may be desirable to maintain the structural elements in those regions of the component which are exposed to increased stress, which bring about increased rigidity in the finished component. For this purpose, the structural elements become a hollow pro when the sheet is formed fil at least partially retained on the surface of the sheet, which can be achieved by appropriate contouring of the inner surface of the forming tool.
Fig. 1 zeigt exemplarisch den Ausschnitt eines Blechs, welches in dem erfindungsgemäßen Verfahren zum Einsatz kommen soll .1 shows an example of the section of a sheet which is to be used in the method according to the invention.
Das Blech 1 weist gleichmäßig verteilt mehrere Strukturelemente 2 in Form von Erhöhungen bzw. Aufwölbungen auf.The sheet 1 has a number of structural elements 2 distributed uniformly in the form of elevations or bulges.
Das Blech 1 wird dann anschließend zu einem beispielsweise rotationssymmetrischen rohrförmigen Hohlprofilhalbzeug gebogen und an den Stoßflächen entlang einer Längsnaht unter Ausbildung dieses Hohlprofilhalbzeugs verschweißt, sodass über den gesamten Umfang des Hohlprofilhalbzeugs Strukturelemente 2 in Form von derartigen Aufwölbungen vorgesehen sind.The sheet 1 is then subsequently bent to form, for example, a rotationally symmetrical tubular hollow semi-finished product and welded to the butt surfaces along a longitudinal seam to form this hollow profile semi-finished product, so that structural elements 2 in the form of such bulges are provided over the entire circumference of the hollow profile semi-finished product.
Die Strukturelemente 2 sind insbesondere kreissymmetrisch ausgebildet, sodass die Materialabstreckung im Randbereich der Wölbungen 2 minimal gehalten wird.The structural elements 2 are in particular circularly symmetrical, so that the material stretching in the edge region of the bulges 2 is kept to a minimum.
Anschließend wird das Hohlprofilhalbzeug mittels Innenhochdruck in einem Innenhochdruck-Umformwerkzeug zum Hohlprofil aufgeweitet .The hollow profile semi-finished product is then expanded to the hollow profile by means of internal high pressure in an internal high pressure forming tool.
Alternativ ist denkbar, das Hohlprofil aus zwei Blechen 1 auszubilden, wobei diese zuerst aufeinandergelegt und dann in einem Innenhochdruck-Umformwerkzeug eingespannt werden. Sodann wird zwischen die Bleche 1 ein Druckfluid eingeleitet, welche unter Ausüben eines Innenhochdruckes mittels des Druckfluids aufgespreizt und zum Hohlprofil aufgeweitet werden .Alternatively, it is conceivable to form the hollow profile from two sheets 1, these first being placed one on top of the other and then clamped in an internal high-pressure forming tool. Then, a pressure fluid is introduced between the sheets 1, which is expanded by the application of an internal high pressure by means of the pressure fluid and expanded to the hollow profile become .
In einer weiteren Variante der Erfindung wird in Abweichung vom erstgenannten Ausführungsbeispiel das Hohlprofilhalbzeug nach der Längsnahtverschweißung in einem Außenhoch- druckumformwerkzeug durch Zusammenwirken eines von außen nach innen gerichteten fluidischen Hochdruckes mit einer in das Innere des Hohlpro ilhalbzeugs eingebrachten Matrize zum Hohlprofil ausgeformt, wobei das Halbzeug konturtreu an die Matrize, die in Form und Kontur das Hohlprofil abbildet, angepresst wird.In a further variant of the invention, in deviation from the first-mentioned exemplary embodiment, the hollow profile semi-finished product is formed into a hollow profile after the longitudinal seam welding in an external high-pressure forming tool by the interaction of a fluidic high pressure directed inwards from the outside with a die introduced into the interior of the hollow profile semi-finished product, the semi-finished product being true to contour is pressed onto the die, which forms the shape and contour of the hollow profile.
Bei allen Ausführungsbeispielen weisen die Bleche 1, deren Umformung zum wunschgemäßen Hohlprofil führen, Strukturelemente 2 in Form von Auswölbungen auf . In all of the exemplary embodiments, the metal sheets 1, the deformation of which leads to the desired hollow profile, have structural elements 2 in the form of bulges.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung eines Hohlprofils, welches aus zumindest einem Blech mittels eines fluidischen Hochdruckes ausgeformt wird, dadurch gekennzeichnet, dass vor der Ausformung des Blechs (1) die Oberfläche des Blechs (1) mit Strukturelementen (2) in Form von Vertiefungen und/oder Erhöhungen versehen wird, wobei die Anzahl, Dimensionen und Konturen der Strukturelemente (2) dabei so gewählt werden, dass beim Aufweiten die für das Bauteil maximal zulässige Umfangsänderung beibehalten und die maximale Ausformung erhöht wird.1. A method for producing a hollow profile, which is formed from at least one sheet by means of a high pressure fluid, characterized in that before the sheet (1) is formed, the surface of the sheet (1) with structural elements (2) in the form of depressions and / or increases are provided, the number, dimensions and contours of the structural elements (2) being selected such that the maximum circumferential change permitted for the component is maintained during expansion and the maximum shape is increased.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Blech (1) zu einem rohrförmigen Hohlprofilhalbzeug gebogen, dann langsnahtverschweißt und anschließend mittels Innenhochdruck in einem Innenhochdruck- Umformwerkzeug zum Hohlprofil aufgeweitet wird.2. The method according to claim 1, characterized in that the sheet (1) is bent into a tubular hollow profile semifinished product, then welded slowly and then expanded by means of internal high pressure in an internal high pressure forming tool to form the hollow profile.
3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass zwei Bleche (1) aufeinandergelegt und in einem Innenhochdruck-Umformwerkzeug eingespannt werden, wonach zwischen die Bleche (1) ein Druckfluid eingeleitet wird, und dass unter Ausüben eines Innenhochdruckes mittels des Druckfluids die Bleche (1) aufgespreizt und zum Hohlprofil aufgeweitet werden.3. The method according to claim 1, characterized in that two sheets (1) are placed one on top of the other and clamped in an internal high-pressure forming tool, after which a pressure fluid is introduced between the sheets (1), and that the sheets (1) are exerted by means of the pressure fluid while exerting an internal high pressure. 1) spread and to Hollow profile can be expanded.
4. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Blech (1) zu einem rohrförmigen Hohlprofilhalbzeug gebogen und dann langsnahtverschweißt wird, und dass das Hohlprofilhalbzeug in einem Außenhochdruckum- formwerkzeug durch Zusammenwirken eines von außen nach innen gerichteten fluidischen Hochdruckes mit einer in das Innere des Hohlprofilhalbzeugs eingebrachten Matrize zum Hohlprofil ausgeformt wird.4. The method according to claim 1, characterized in that the sheet (1) is bent into a tubular hollow profile semifinished product and then slowly welded, and that the hollow profile semifinished product in an external high pressure forming tool by the interaction of an externally inward directed fluid pressure with an internal pressure of the hollow profile semifinished die is formed into the hollow profile.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass beim Einlegen des Hohlprofils in das Umformwerkzeug die Strukturelemente (2) zu der Innenoberfläche des Um- formwerkzeugs teilweise Hohlräume zur Aufnahme eines Schmierstoffs einschließen.5. The method according to any one of claims 1 to 4, characterized in that when inserting the hollow profile in the forming tool, the structural elements (2) to the inner surface of the forming tool partially include cavities for receiving a lubricant.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Strukturelemente (2) beim Umformen zum Hohlprofil auf der Oberfläche des Blechs (1) teilweise beibehalten werden.6. The method according to any one of claims 1 to 5, characterized in that the structural elements (2) are partially retained on the surface of the sheet (1) during the forming into a hollow profile.
7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Strukturelemente (2) auf der Oberfläche des Blechs (1) eingeprägt oder gewalzt werden. 7. The method according to any one of the preceding claims, characterized in that the structural elements (2) on the surface of the sheet (1) are embossed or rolled.
PCT/EP2004/012692 2003-12-06 2004-11-10 Method for producing a hollow profile WO2005053871A1 (en)

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DE502004004916T DE502004004916D1 (en) 2003-12-06 2004-11-10 METHOD FOR PRODUCING A HOLLOW PROFILE
EP04797759A EP1708832B1 (en) 2003-12-06 2004-11-10 Method for producing a hollow profile
CA002548271A CA2548271A1 (en) 2003-12-06 2004-11-10 Method for producing a hollow profile

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DE2003157119 DE10357119B4 (en) 2003-12-06 2003-12-06 Process for producing a hollow profile
DE10357119.1 2003-12-06

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EP2108467A2 (en) 2008-04-11 2009-10-14 ThyssenKrupp Steel AG Method for producing highly dimensionally accurate half shells
DE102021213010A1 (en) 2021-11-18 2023-05-25 Ipu Ingenieurgesellschaft Braunschweig Mbh Process for the mold-free production of a component with relief and component with relief

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EP2108467A2 (en) 2008-04-11 2009-10-14 ThyssenKrupp Steel AG Method for producing highly dimensionally accurate half shells
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EP2108467A3 (en) * 2008-04-11 2013-04-03 ThyssenKrupp Steel Europe AG Method for producing highly dimensionally accurate half shells
DE102021213010A1 (en) 2021-11-18 2023-05-25 Ipu Ingenieurgesellschaft Braunschweig Mbh Process for the mold-free production of a component with relief and component with relief
DE102021213010B4 (en) 2021-11-18 2023-06-15 Ipu Ingenieurgesellschaft Braunschweig Mbh Process for the mold-free production of a component with relief and component with relief

Also Published As

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DE502004004916D1 (en) 2007-10-18
DE10357119B4 (en) 2005-11-24
DE10357119A1 (en) 2005-07-14
EP1708832B1 (en) 2007-09-05
CA2548271A1 (en) 2005-06-16
EP1708832A1 (en) 2006-10-11

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