EP1708832B1 - Method for producing a hollow profile - Google Patents
Method for producing a hollow profile Download PDFInfo
- Publication number
- EP1708832B1 EP1708832B1 EP04797759A EP04797759A EP1708832B1 EP 1708832 B1 EP1708832 B1 EP 1708832B1 EP 04797759 A EP04797759 A EP 04797759A EP 04797759 A EP04797759 A EP 04797759A EP 1708832 B1 EP1708832 B1 EP 1708832B1
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- European Patent Office
- Prior art keywords
- profiled section
- metal sheet
- hollow profiled
- forming tool
- process according
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Classifications
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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
- 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
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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
- B21D22/20—Deep-drawing
- B21D22/201—Work-pieces; preparation of the work-pieces, e.g. lubricating, coating
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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
- 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
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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
- 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
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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
- 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 present invention relates to a method for producing a hollow profile, in particular a hydroforming method, according to the preamble of claim 1.
- the method 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 on the edge side, are widened to form a hollow profile.
- IHU hydroforming
- a hydroforming method is known in which two superimposed sheets are clamped between two hold-downs, which are spaced apart from each other to form a Aufweitraumes.
- the expansion space is bounded above and below by two matrices.
- a fluidic internal high pressure is introduced, which widen the sheets.
- the dies are at different distances from the double sheet with the sheet furthest from the opposite die having warps. These vaults form a reserve of material through which the sheet metal is the larger Reshape can withstand damage.
- the bulges are smoothed out by the internal high pressure for complete deformation of the sheet.
- the achievable component geometry in components formed by internal high pressure is largely determined by the maximum change in circumference which the component can undergo during hydroforming.
- This maximum permissible circumferential change in turn is defined by the maximum elongation at break of the material used for the component and the position of the molding itself. In other words, determines the maximum achievable shape 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 dimension or the diameter of the profiles or tubes over the minimum component circumference is set such that in all areas of the component during the forming a plastic deformation is achieved.
- the invention relates to a method for producing a hollow profile, wherein this is formed from at least one sheet by fluidic high pressure. Before the Forming the surface of the sheet is provided with structural elements in the form of depressions and / or elevations.
- the number, dimensions and contours of the structural elements are specifically determined depending on the properties to be achieved of the component to be produced, so that the maximum permissible circumferential change for the component is maintained during the final pressurization with fluidic high pressure and the maximum shape is increased.
- Such a relationship also permits hydroforming in which the maximum molding is maintained so that the circumferential change can be reduced if desired.
- 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 hydroforming can make it structurally more favorable with regard to its subsequent use, in particular with regard to the stiffness and strength properties, for example in relation to the force absorption capability. since such structured profiles are easier to implement in connection with the work hardening of the material during hydroforming.
- contour of the structural elements in the form of recesses and / or elevations is in principle optional. In their manufacture, which is accomplished for example by embossing or rolling the sheet surface, only needs to be ensured be that the material stretch is minimized in the edge regions of the structural elements.
- the insertion profile of the component to be reshaped that is, the contour of the sheet, which is inserted into the forming tool prior to expansion, equipped by the presence of structural elements with an enlarged scope.
- This increased size provides a deformation reserve through a larger effective surface.
- the novel design of the sheet used with structural elements also allows that when inserting the sheet into the forming at least some of the structural elements to the inner surface of the forming partially form cavities for receiving a lubricant, which keeps the friction between the inner surface and the sheet low , This also results in an increase in the maximum permissible change in circumference.
- the structural elements may be desirable to maintain the structural elements in those areas of the component which are exposed to increased stress, which effect increased rigidity in the finished component.
- FIG. 1 shows by way of example the section of a sheet which is to be used in the method according to the invention.
- the sheet 1 has evenly distributed a plurality of structural elements 2 in the form of elevations or bulges.
- the metal sheet 1 is then subsequently bent to form, for example, a rotationally symmetrical tubular hollow profile semi-finished product and welded to the abutting 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 structural elements 2 are designed in particular circularly symmetrical, so that the material stretch in the edge region of the curvatures 2 is minimized.
- the hollow profile semifinished product is expanded by means of internal high pressure in a hydroforming forming tool for hollow profile.
- the hollow profile semi-finished product after longitudinal seam welding in an external high-pressure forming tool formed by cooperation of a directed from outside to inside fluidic high pressure with a introduced into the interior of the hollow profile semi-finished die to the hollow profile, wherein the semi-finished contoured to the die, which forms the hollow profile in shape and contour is pressed.
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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
Description
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 a hydroforming 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 Hohlprofil 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 method 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 on the edge side, are widened to form a hollow profile. It is also common practice to insert a bent into a hollow profile sheet, which is welded along a longitudinal seam, insert in a hydroforming (IHU) tool, then to introduce by means of a fluid an internal high pressure in the hollow profile, whereby the hollow profile is then driven apart and conforms to the contour of the hydroforming die.
Aus der
Die erzielbare Bauteilgeometrie bei durch Innenhochdruck umgeformten Bauteilen bestimmt sich in hohem Maße durch die maximale Umfangsänderung, welche das Bauteil während des Innenhochdruckumformens erfahren kann.The achievable component geometry in components formed by internal high pressure is largely determined by the maximum change in circumference which the component can undergo during hydroforming.
Diese maximal zulässige Umfangsänderung 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 erreichbare Ausformung beim Innenhochdruckumformen einerseits durch die maximal zulässige Umfangsänderung sowie andererseits durch den Ursprungsumfang des Ausgangsmaterials.This maximum permissible circumferential change in turn is defined by the maximum elongation at break of the material used for the component and the position of the molding itself. In other words, determines the maximum achievable shape 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.Come as a starting material, for example, smooth, longitudinally welded pipes or hollow sections are used, the dimension or the diameter of the profiles or tubes over the minimum component circumference is set such that in all areas of the component during the forming a plastic deformation is achieved.
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 Ausschussquote zur Folge hat.In the production of such products by means of hydroforming, however, it is disadvantageous that in a high number of applications, the maximum achievable shape is utilized to approximately 100%, which has a high, considerable cost-causing scrap rate result.
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 automotive industry, it is desirable for structural components to meet high demands in terms of both strength and rigidity. In addition, there is considerable interest in realizing lightweight construction concepts in vehicle construction and therefore to reduce 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, as a starting material, thin sheets of high-strength steels, which have comparable strength to thicker sheets of conventional steels, with simultaneous weight reduction. However, the required rigidity is then achieved by means of stiffness-increasing structures, such as, for example, elevations and / or depressions in the surface of the component, at least in those areas which are later exposed to an increased load during use.
Aus diversen fertigungs- und konstruktionstechnischen Gründen ist es jedoch auch gewünscht, mittels des Innenhochdruckumformens 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.However, for various manufacturing and construction reasons, it is also desirable to produce by means of the hydroforming structured profiles for more complex products than before, which correspond in particular to the requirements of lightweight construction. Here, in particular, the frame structure components of the body 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 in terms of strength and rigidity, without causing the maximum achievable shape with concomitant increased Committee must be fully utilized.
Gelöst wird diese Aufgabe mit den Merkmalen des Patentanspruchs 1.This problem is solved 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, wherein this is formed from at least one sheet by fluidic high pressure. Before the Forming 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 Beaufschlagung mit fluidischem Hochdruck die für das Bauteil maximal zulässige Umfangsänderung beibehalten und die maximale Ausformung erhöht wird.In order to form such a vault-structured sheet, according to the invention, the number, dimensions and contours of the structural elements are specifically determined depending on the properties to be achieved of the component to be produced, so that the maximum permissible circumferential change for the component is maintained during the final pressurization with fluidic high pressure 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 relationship also permits hydroforming in which the maximum molding is maintained so that the circumferential change can be reduced if desired.
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 hydroforming can make it structurally more favorable with regard to its subsequent use, in particular with regard to the stiffness and strength properties, for example in relation to the force absorption capability. since such structured profiles are easier to implement in connection with the work hardening of the material during hydroforming.
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, can be produced with the inventive method, in particular support 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.The contour of the structural elements in the form of recesses and / or elevations is in principle optional. In their manufacture, which is accomplished for example by embossing or rolling the sheet surface, only needs to be ensured be that the material stretch is minimized in the edge regions of the structural elements.
Gemäß der Erfindung wird also das Einlegeprofil des umzuformenden Bauteils, das heißt die Kontur des Bleches, welches 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, therefore, the insertion profile of the component to be reshaped, that is, the contour of the sheet, which is inserted into the forming tool prior to expansion, equipped by the presence of structural elements with an enlarged scope. This increased size 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 be achieved even 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 Ausgangsmaterials so gering wie möglich zu halten.It is known that a further factor influencing the hydroforming process is the friction between the workpiece and the forming tool during the forming process. So far, among other things, attempts have been made to keep them as low as possible by means of an appropriate coating on 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 used with structural elements also allows that when inserting the sheet into the forming at least some of the structural elements to the inner surface of the forming partially form cavities for receiving a lubricant, which keeps the friction between the inner 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 Hohlprofil 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 produced, it may be desirable to maintain the structural elements in those areas of the component which are exposed to increased stress, which effect increased rigidity in the finished component. For this purpose, the structural elements during the forming of the sheet to the hollow profile maintained on the surface of the sheet at least partially, which can be accomplished by a corresponding contour design 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 by way of example 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 evenly distributed a plurality of structural elements 2 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 metal sheet 1 is then subsequently bent to form, for example, a rotationally symmetrical tubular hollow profile semi-finished product and welded to the abutting 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 designed in particular circularly symmetrical, so that the material stretch in the edge region of the curvatures 2 is minimized.
Anschließend wird das Hohlprofilhalbzeug mittels Innenhochdruck in einem Innenhochdruck-Umformwerkzeug zum Hohlprofil aufgeweitet.Subsequently, the hollow profile semifinished product is expanded by means of internal high pressure in a hydroforming forming tool for hollow profile.
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 of two sheets 1, wherein these are first stacked and then clamped in a hydroforming forming tool. Then, a pressure fluid is introduced between the sheets 1, which are spread apart by exerting a high internal pressure by means of the pressure fluid and expanded to form the hollow profile.
In einer weiteren Variante der Erfindung wird in Abweichung vom erstgenannten Ausführungsbeispiel das Hohlprofilhalbzeug nach der Längsnahtverschweißung in einem Außenhochdruckumformwerkzeug durch Zusammenwirken eines von außen nach innen gerichteten fluidischen Hochdruckes mit einer in das Innere des Hohlprofilhalbzeugs 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 embodiment, the hollow profile semi-finished product after longitudinal seam welding in an external high-pressure forming tool formed by cooperation of a directed from outside to inside fluidic high pressure with a introduced into the interior of the hollow profile semi-finished die to the hollow profile, wherein the semi-finished contoured to the die, which forms the hollow profile in shape and contour is pressed.
Bei allen Ausführungsbeispielen weisen die Bleche 1, deren Umformung zum wunschgemäßen Hohlprofil führen, Strukturelemente 2 in Form von Auswölbungen auf.In all embodiments, the sheets 1, the deformation lead to the desired hollow profile, structural elements 2 in the form of bulges.
Claims (6)
- Process for producing a hollow profiled section which is shaped out of at least one metal sheet (1) by means of a fluidic high pressure, wherein prior to the shaping of the metal sheet (1) the surface of the metal sheet (1) is provided with structure elements (2) in the form of depressions and/or elevations, the number, dimensions and contours of the structure elements (2) being selected in such a way that during the widening the maximum permissible change in peripheral size for the component is complied with and the maximum degree of shaping is increased, characterized in that during the introduction of the at least one metal sheet (1) into the forming tool the structural elements (2), with respect to the inner surface of the forming tool, in some cases enclose cavities for holding a lubricant.
- Process according to Claim 1, characterized in that the metal sheet (1) is bent to form a tubular semi-finished hollow profiled section, is then longitudinal seam welded and then widened by means of internal high pressure in an internal high-pressure forming tool to form the hollow profiled section.
- Process according to Claim 1, characterized in that two metal sheets (1) are placed on top of one another and clamped in an internal high-pressure forming tool, after which a pressurized fluid is introduced between the metal sheets (1), and in that the metal sheets (1) are spread apart and widened to form the hollow profiled section by the application of an internal high pressure by means of the pressurized fluid.
- Process according to Claim 1, characterized in that the metal sheet (1) is bent to form a tubular semi-finished hollow profiled section and is then longitudinal seam welded, and in that the semi-finished hollow profiled section is shaped into the hollow profiled section in an external high-pressure forming tool by the interaction of a fluidic high pressure directed from the outside inward with a die which has been introduced into the interior of the semi-finished hollow profiled section.
- Process according to one of Claims 1 to 4, characterized in that the structure elements (2) are at least partially retained on the surface of the metal sheet (1) during the deformation used to form the hollow profiled section.
- Process according to one of the preceding claims, characterized in that the structure elements (2) are stamped or rolled on the surface of the metal sheet (1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2003157119 DE10357119B4 (en) | 2003-12-06 | 2003-12-06 | Process for producing a hollow profile |
| PCT/EP2004/012692 WO2005053871A1 (en) | 2003-12-06 | 2004-11-10 | Method for producing a hollow profile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1708832A1 EP1708832A1 (en) | 2006-10-11 |
| EP1708832B1 true EP1708832B1 (en) | 2007-09-05 |
Family
ID=34638451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04797759A Expired - Fee Related EP1708832B1 (en) | 2003-12-06 | 2004-11-10 | Method for producing a hollow profile |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1708832B1 (en) |
| CA (1) | CA2548271A1 (en) |
| DE (2) | DE10357119B4 (en) |
| WO (1) | WO2005053871A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008018656B3 (en) * | 2008-04-11 | 2009-03-12 | Thyssenkrupp Steel Ag | Method for cold pressing metal sheets with two stage press process in the same press |
| US11982200B1 (en) | 2023-06-23 | 2024-05-14 | Pratt & Whitney Canada Corp. | Structure with structural reinforcement patterns |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009050277A1 (en) * | 2009-10-21 | 2011-05-19 | Lothar Walther Verwaltungsgesellschaft Mbh & Co. Kg | Method for producing inner profile at inner wall of cavity region of semi-finished product, involves providing shaping device, particularly bolt with external profile to define shaped region negatively designed to inner profile |
| 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 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4761982A (en) * | 1986-10-01 | 1988-08-09 | General Motors Corporation | Method and apparatus for forming a heat exchanger turbulator and tube |
| US4840053A (en) * | 1987-07-29 | 1989-06-20 | Mitsui & Co., Ltd. | Method for manufacturing a pipe with projections |
| DE4419652A1 (en) * | 1994-06-04 | 1995-12-07 | Meckenstock H W Kg | Plate=shaped element for light component mfr. |
| DE19803782B4 (en) * | 1998-01-22 | 2005-06-16 | Hellwig, Udo, Prof. Dr. | Method and device for shaping bodies by means of secondary forming transformation |
| DE10104860C1 (en) * | 2001-02-03 | 2002-02-07 | Daimler Chrysler Ag | Production of a hollow body from two plates has two dies with a high internal fluid pressure between them to force the plates against the die surfaces with structured local curves to prevent creasing/folding |
-
2003
- 2003-12-06 DE DE2003157119 patent/DE10357119B4/en not_active Expired - Fee Related
-
2004
- 2004-11-10 DE DE502004004916T patent/DE502004004916D1/en active Active
- 2004-11-10 CA CA002548271A patent/CA2548271A1/en not_active Abandoned
- 2004-11-10 WO PCT/EP2004/012692 patent/WO2005053871A1/en active IP Right Grant
- 2004-11-10 EP EP04797759A patent/EP1708832B1/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008018656B3 (en) * | 2008-04-11 | 2009-03-12 | Thyssenkrupp Steel Ag | Method for cold pressing metal sheets with two stage press process in the same press |
| DE102008018656B9 (en) * | 2008-04-11 | 2009-07-09 | Thyssenkrupp Steel Ag | Process for producing high-volume half-shells |
| EP2108467A2 (en) | 2008-04-11 | 2009-10-14 | ThyssenKrupp Steel AG | Method for producing highly dimensionally accurate half shells |
| US11982200B1 (en) | 2023-06-23 | 2024-05-14 | Pratt & Whitney Canada Corp. | Structure with structural reinforcement patterns |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10357119A1 (en) | 2005-07-14 |
| DE502004004916D1 (en) | 2007-10-18 |
| EP1708832A1 (en) | 2006-10-11 |
| DE10357119B4 (en) | 2005-11-24 |
| WO2005053871A1 (en) | 2005-06-16 |
| CA2548271A1 (en) | 2005-06-16 |
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