EP0974411A1 - Engraved forming tool for forming by means of a pressure medium - Google Patents

Engraved forming tool for forming by means of a pressure medium Download PDF

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Publication number
EP0974411A1
EP0974411A1 EP99113024A EP99113024A EP0974411A1 EP 0974411 A1 EP0974411 A1 EP 0974411A1 EP 99113024 A EP99113024 A EP 99113024A EP 99113024 A EP99113024 A EP 99113024A EP 0974411 A1 EP0974411 A1 EP 0974411A1
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EP
European Patent Office
Prior art keywords
engraving
workpiece
microstructures
tool
active medium
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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
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EP99113024A
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German (de)
French (fr)
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EP0974411B1 (en
Inventor
Bernd Dr.-Ing. Schulze
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Dr Meleghy Hydroforming GmbH and Co KG
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Dr Meleghy Hydroforming GmbH and Co KG
Meleghy Hydroforming GmbH and Co KG
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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
    • B21D26/033—Deforming tubular bodies
    • B21D26/047—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
    • B21D26/021—Deforming sheet bodies
    • B21D26/031—Mould construction

Definitions

  • the invention relates to a tool engraving Forming tool for forming by means of active medium, according to the Preamble of the first claim, the tool a pressure medium supply for the active medium and a Engraving according to the desired final contour of the Has workpiece and liquid or as the active medium gaseous pressure media are used.
  • the invention can for the internal high pressure forming of tubular workpieces as well from adjacent to one another and possibly with one another connected double plates as well as in the hydroforming of Single or double boards or with hydromechanical Thermoforming application.
  • the pressure medium can reach the engraving of the tool, so that when the subsequent workpieces are formed in the area in which pressure medium adheres to the engraving, there is no contact between the engraving and the workpiece wall, as a result of which undesirable deformations occur on the workpiece.
  • These deformations result in restrictions in the evaluation of the surface quality of the workpiece.
  • bubbles can form between sheet metal or thin foils to be formed and engraving, which likewise produces undesirable deformations of the workpieces.
  • the object of the invention is to deform the To prevent the workpiece by the active medium and the Improve surface quality and at the same time defined To achieve surface properties of the workpiece.
  • microstructures are incorporated into the engraving of the tool. These microstructures should not have a negative influence on the surface quality of the workpiece and should be suitable for absorbing the printing medium adhering to the engraving while the workpiece is pressed against the engraving and for counteracting deformation due to local build-up of the printing medium between the engraving and the workpiece. Furthermore, there is the possibility of specifically influencing the surface structure of the workpiece by means of the microstructures (microstructures), so that, for example, a more uniform shaping takes place and better adhesive properties are guaranteed for a subsequent coating.
  • the microstructures should have a dimension in the order of magnitude of one molecule of the printing medium up to approximately 100 ⁇ m width and 100 ⁇ m depth / or height.
  • the microstructures can have any shape and are arranged at the same or different distances from one another or also merge into one another and form, for example, line structures, meandering structures or point-like structures.
  • the microstructures on the engraving can be arranged over the entire surface or only at defined positions (eg in radius elements) if there is a risk of deformation only at these points, or if only certain surface areas of the workpiece have special surface properties (eg adhesive and friction properties) are desired.
  • Figure 1 shows an internal high pressure forming tool with an upper tool half 1a and a lower tool half 1b, which are movable relative to each other for loading and removing the workpiece.
  • both tool halves 1a, 1b are closed and have an engraving 2.
  • the internal high-pressure forming tool is the not yet formed tubular workpiece W.
  • Feed cylinders 3 act on both pipe ends of the workpiece, which ensure that the material continues to flow during the internal high-pressure forming and at the same time seal the workpiece W.
  • a pressure medium supply line 4 leads to the feed cylinder 3 shown on the left in FIG. 1, via which the pressure medium is supplied to the workpiece W, for example by means of a hydraulic unit 5.
  • the wall of the workpiece then presses against the inner contour of the tool and thus against the engraving 2 of the hydroforming tool.
  • the engraving is complete or only provided with microstructures in the areas in which the liquid pressure medium can collect before inserting the next workpiece (marked separately).
  • the tool also has a split shape (see FIG. 2).
  • the upper tool half 1a has, for example, the engraving 2 and the lower tool half 1b has a pressure chamber 6, in which the pressure medium supply 4 opens.
  • the workpiece W is clamped in the form of a single blank between the closed tool halves 1a and 1b.
  • the sheet (workpiece W) lies against the engraving 2 of the upper tool half 1a.
  • the engraving can be provided with microstructures which either avoid an unwanted deformation of the workpiece due to the active medium enclosed between the engraving and the workpiece and / or specifically influence the surface quality of the workpiece.
  • Fig. 3 is a tool part 1a with an engraving 2 acc.
  • Fig. 2 shown, in which in the corner areas Microstructures M are arranged.
  • the surface of the engraving 2 has the smallest depressions in the form of Microstructures M into which the engraving 2 pent active medium can escape during the forming process, so that a perfect surface of the workpiece W is guaranteed.
  • the microstructures are here lined up in a meandering pattern.
  • FIG. 5 is a circular arrangement of the Microstructures M are shown which e.g. at a deepest Point of an engraving 2 may lie.
  • microstructures M can for example by laser machining, electroerosive Machining, ultrasonic erosion, scoring, etching or by other suitable ablation procedures.
  • electroerosive Machining e.g. by electroerosive Machining
  • ultrasonic erosion e.g. by ultrasonic erosion
  • scoring e.g. by etching
  • etching e.g. by lithography
  • the arrangement of the microstructures can be cross-shaped, linear, circular, meandering or in other structures or shapes. 4 shows two variants with meandering and circular lines of the microstructures.
  • the microstructures avoid the formation of bubbles, since the active medium can escape into the microstructures.
  • lubricants can be saved on the workpiece.
  • a defined influence on the material flow is also possible, for example, by roughening the engraving with the microstructures.
  • the microstructures can be used to produce a workpiece surface with more favorable adhesive properties for a subsequent coating of the workpiece.
  • the size of the microstructures should preferably be between 10 and 100 microns are around this not to the To make the workpiece surface visible.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Pens And Brushes (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The mold has a micro-surface structure at the mold wall to prevent distortion and surface damage at the workpiece when being shaped under pressure. The mold to shape a workpiece by inner pressure which forces it against the mold wall, has a pressure medium feed to press the workpiece (W) against the wall surface (2) which has a surface microstructure. The wall microstructure surface does not affect the workpiece (W) surface, and prevents a buildup between the workpiece and the wall, holds the workpiece in place, and can hold a lubricant. The microstructure also acts on the workpiece material flow during the shaping action. The microstructure is formed by a laser, electro-erosion, ultrasonic erosion, scraping or etching. The microstructures are about equal to the dimensions of the molecules of the pressure medium, with a width of 100 mu m and a depth/height of 100 mu m.

Description

Die Erfindung betrifft eine Werkzeuggravur eines Umformwerkzeuges zum Umformen mittels Wirkmedium, nach dem Oberbegriff des ersten Patentanspruchs, wobei das Werkzeug eine Druckmittelzuführung für das Wirkmedium und eine Gravur entsprechend der gewünschten Endkontur des Werkstückes aufweist und als Wirkmedium flüssige oder gasförmige Druckmedien Anwendung finden. Die Erfindung kann beim Innenhochdruckumformen rohrförmiger Werkstücke sowie von randseitig aneinander anliegenden und ggf. miteinander verbundenen Doppelplatinen sowie beim Hydroumformen von Einfach- oder Doppelplatinen oder beim hydromechanischen Tiefziehen Anwendung.The invention relates to a tool engraving Forming tool for forming by means of active medium, according to the Preamble of the first claim, the tool a pressure medium supply for the active medium and a Engraving according to the desired final contour of the Has workpiece and liquid or as the active medium gaseous pressure media are used. The invention can for the internal high pressure forming of tubular workpieces as well from adjacent to one another and possibly with one another connected double plates as well as in the hydroforming of Single or double boards or with hydromechanical Thermoforming application.

Bei den gattungsgemäßen Umformverfahren erfolgt beim Hyroumformen (z.B. DE 44 34 799 A1) sowie beim Innenhochdruckumformen (siehe z.B. DE 195 35 870 A1 und Notrott, A.: Neuere Entwicklungen in der Blechumformung; Siegert, K.; Neuere Entwicklungen beim Innenhochdruckumformen..., 1998, Verlag MAT-INFO Werkstoff-Informationsgesellschaft mbH, S. 365-377) durch den Druck des Druckmediums das Anformen der Wandung des Werkstückes an die Gravur des Werkzeuges. Beim Entnehmen des Werkstückes kann das Druckmedium an die Gravur des Werkzeuges gelangen, wodurch beim Umformen der nachfolgenden Werkstücke in dem Bereich, in welchem Druckmittel an der Gravur haftet, keine Berührung zwischen Gravur und Werkstückwandung zustande kommt, wodurch unerwünschte Deformierungen am Werkstück auftreten.
Diese Deformierungen bewirken Einschränkungen in der Bewertung der Oberflächenqualität des Werkstücks. Auch bei gasförmigen Wirkmedien können Blasenbildungen zwischen Blech oder umzuformenden dünnen Folien und Gravur auftreten, wodurch ebenfalls unerwünschte Deformationen der Werkstücke erzeugt werden.In the generic forming process, hyro-forming (e.g. DE 44 34 799 A1) and hydroforming (see e.g. DE 195 35 870 A1 and Notrott, A .: newer developments in sheet metal forming; Siegert, K .; newer developments in hydroforming ... , 1998, Verlag MAT-INFO Werkstoff-Informationsgesellschaft mbH, pp. 365-377) by the pressure of the pressure medium the molding of the wall of the workpiece to the engraving of the tool. When the workpiece is removed, the pressure medium can reach the engraving of the tool, so that when the subsequent workpieces are formed in the area in which pressure medium adheres to the engraving, there is no contact between the engraving and the workpiece wall, as a result of which undesirable deformations occur on the workpiece.
These deformations result in restrictions in the evaluation of the surface quality of the workpiece. Even in the case of gaseous active media, bubbles can form between sheet metal or thin foils to be formed and engraving, which likewise produces undesirable deformations of the workpieces.

Aufgabe der Erfindung ist es, Deformierungen des Werkstückes durch das Wirkmedium zu verhindern sowie die Oberflächengüte zu verbessern und gleichzeitig definierte Oberflächeneigenschaften des Werkstückes zu erzielen.The object of the invention is to deform the To prevent the workpiece by the active medium and the Improve surface quality and at the same time defined To achieve surface properties of the workpiece.

Diese Aufgabe wird erfindungsgemäß mit den Merkmalen des ersten Patentanspruchs dadurch gelöst, daß in die Gravur des Werkzeuges Mikrostrukturen eingearbeitet werden. Diese Mikrostrukturen sollten die Oberflächenqualität des Werkstückes nicht negativ beeinflussen und dazu geeignet sein, während des Anpressens des Werkstücks an die Gravur das in der Gravur haftende Druckmedium aufzunehmen und einer Deformierung durch örtlichen Aufstau des Druckmediums zwischen Gravur und Werkstuck entgegenzuwirken. Weiterhin besteht die Möglichkeit, durch die Mikrostrukturen (Mikrostrukturen) die Oberflächenstruktur des Werkstücks gezielt zu beeinflussen, so daß z.B. eine gleichmäßigere Umformung erfolgt und bessere Hafteigenschaften für eine nachfolgende Beschichtung gewährleistet werden.
Die Mikrostrukturen sollten dabei eine Abmessung in der Größenordnung von einem Molekül des Druckmediums bis ca. 100µm Breite und 100µm Tiefe/oder Höhe aufweisen. Die Mikrostrukturen können beliebige Formen besitzen und in gleichen oder unterschiedlichen Abständen zueinander angeordnet werden oder auch ineinander übergehen und z.B. Linienstrukturen, meanderförmige Strukturen oder punktförmige Strukturen bilden. Entsprechend der Spezifik des Bauteiles können die Mikrostrukturen an der Gravur ganzflächig oder nur an definierten Positionen (z.B. in Radienelementen) angeordnet sein, wenn nur an diesen Stellen die Gefahr einer Deformierung besteht, oder wenn nur an bestimmten Oberflächenbereichen des Werkstücks besondere Oberflächeneigenschaften (z.B. Haft- und Reibungseigenschaften) gewünscht werden.This object is achieved with the features of the first claim in that microstructures are incorporated into the engraving of the tool. These microstructures should not have a negative influence on the surface quality of the workpiece and should be suitable for absorbing the printing medium adhering to the engraving while the workpiece is pressed against the engraving and for counteracting deformation due to local build-up of the printing medium between the engraving and the workpiece. Furthermore, there is the possibility of specifically influencing the surface structure of the workpiece by means of the microstructures (microstructures), so that, for example, a more uniform shaping takes place and better adhesive properties are guaranteed for a subsequent coating.
The microstructures should have a dimension in the order of magnitude of one molecule of the printing medium up to approximately 100 μm width and 100 μm depth / or height. The microstructures can have any shape and are arranged at the same or different distances from one another or also merge into one another and form, for example, line structures, meandering structures or point-like structures. Depending on the specificity of the component, the microstructures on the engraving can be arranged over the entire surface or only at defined positions (eg in radius elements) if there is a risk of deformation only at these points, or if only certain surface areas of the workpiece have special surface properties (eg adhesive and friction properties) are desired.

Die Erfindung wird nachfolgend an Ausführungsbeispielen und zugehörigen Zeichnungen näher erläutert.The invention is based on exemplary embodiments and associated drawings explained in more detail.

Es zeigen:

Fig. 1:
Prinzipdarstellung eines Innenhochdruckumformwerkzeuges
Fig. 2:
Prinzipdarstellung eines Hydroumformwerkzeuges
Fig. 3:
Schnittdarstellung durch eine Gravur mit Mikrostrukturen in den Eckbereichen
Fig. 4:
Gravur mit meanderförmigem Linienverlauf der Mikrostrukturen
Fig. 5:
Gravur mit kreisförmigen Linienverlauf der Mikrostrukturen
Show it:
Fig. 1:
Schematic diagram of a hydroforming tool
Fig. 2:
Schematic diagram of a hydroforming tool
Fig. 3:
Sectional view through an engraving with microstructures in the corner areas
Fig. 4:
Engraving with meandering lines of the microstructures
Fig. 5:
Engraving with circular lines of the microstructures

Figur 1 zeigt ein Innenhochdruckumformwerkzeug mit einer oberen Werkzeughälfte 1a und einer unteren Werkzeughälfte 1b, die zum Beschicken und zum Entnehmen des Werkstücks relativ zueinander bewegbar sind. Beide Werkzeughälften 1a, 1b sind im dargestellten Beispiel geschlossen und weisen eine Gravur 2 auf. Im Innenhochdruckumformwerkzeug befindet sich das noch nicht umgeformte rohrförmige Werkstück W. An beide Rohrenden des Werkstücks greifen Nachschiebezylinder 3 an, die das Nachfließen des Werkstoffs während des Innenhochdruckumformens gewährleisten und gleichzeitig das Werkstück W abdichten. An dem in Fig. 1 links dargestellten Nachschiebezylinder 3 führt eine Druckmittelzuleitung 4, über die z.B. mittels eines Hydraulikagregats 5 dem Werkstück W das Druckmedium zugeführt wird. Beim Innenhochdruckumformen legt sich dann die Wandung des Werkstücks durch den Druck des Druckmediums an die Innenkontur des Werkzeuges und somit an die Gravur 2 des Innenhochdruckumformwerkzeuges an. Die Gravur ist dabei vollständig oder nur in den Bereichen, in denen sich das flüssige Druckmedium vor Einlegen des nächsten Werkstückes sammeln kann (separat gekennzeichnet), mit Mikrostrukturen versehen.
Beim Umformen mittels Wirkmedium von Einfach- oder Doppelplatinen weist das Werkzeug ebenfalls eine geteilte Form auf (s. Fig. 2). Die obere Werkzeughälfte 1a verfügt dabei beispielsweise über die Gravur 2 und die untere Werkzeughälfte 1b verfügt über einen Druckraum 6, in welchen die Druckmittelzuführung 4 mündet. Zwischen den geschlossenen Werkzeughälften 1a und 1b ist das Werkstück W in Form einer Einfachplatine gespannt. Durch die nun folgende Druckzuführung des Wirkmediums in den Druckraum und die Druckbeaufschlagung legt sich das Blech (Werkstück W) an die Gravur 2 der oberen Werkzeughälfte 1a an. Auch in diesem Fall kann die Gravur mit Mikrostrukturen versehen sein, die entweder eine ungewollte Deformierung des Werkstücks aufgrund zwischen Gravur und Werkstück eingeschlossenen Wirkmediums vermeiden und/oder gezielt die Oberflächenqualität des Werkstücks beeinflussen. Figure 1 shows an internal high pressure forming tool with an upper tool half 1a and a lower tool half 1b, which are movable relative to each other for loading and removing the workpiece. In the example shown, both tool halves 1a, 1b are closed and have an engraving 2. In the internal high-pressure forming tool is the not yet formed tubular workpiece W. Feed cylinders 3 act on both pipe ends of the workpiece, which ensure that the material continues to flow during the internal high-pressure forming and at the same time seal the workpiece W. A pressure medium supply line 4 leads to the feed cylinder 3 shown on the left in FIG. 1, via which the pressure medium is supplied to the workpiece W, for example by means of a hydraulic unit 5. In hydroforming, the wall of the workpiece then presses against the inner contour of the tool and thus against the engraving 2 of the hydroforming tool. The engraving is complete or only provided with microstructures in the areas in which the liquid pressure medium can collect before inserting the next workpiece (marked separately).
When forming single or double blanks using the active medium, the tool also has a split shape (see FIG. 2). The upper tool half 1a has, for example, the engraving 2 and the lower tool half 1b has a pressure chamber 6, in which the pressure medium supply 4 opens. The workpiece W is clamped in the form of a single blank between the closed tool halves 1a and 1b. As a result of the subsequent pressure supply of the active medium into the pressure chamber and the pressurization, the sheet (workpiece W) lies against the engraving 2 of the upper tool half 1a. In this case too, the engraving can be provided with microstructures which either avoid an unwanted deformation of the workpiece due to the active medium enclosed between the engraving and the workpiece and / or specifically influence the surface quality of the workpiece.

In Fig. 3 ist ein Werkzeugteil 1a mit einer Gravur 2 gem. Fig. 2 dargestellt, bei welchem in den Eckbereichen die Mikrostrukturen M angeordnet sind.In Fig. 3 is a tool part 1a with an engraving 2 acc. Fig. 2 shown, in which in the corner areas Microstructures M are arranged.

In Fig. 4 wird eine weitere Variante des Linienverlaufes der Mikrostrukturen M gezeigt. Die Oberfläche der Gravur 2 weist dabei kleinste Vertiefungen in Form von Mikrostrukturen M auf in die das sich an der Gravur 2 aufgestaute Wirkmedium beim Umformen entweichen kann, so daß eine einwandfreie Oberfläche des Werkstücks W gewährleistet wird. Die Mikrostrukturen sind hier meanderförmig aneinander gereiht.4 shows a further variant of the line course of the microstructures M shown. The surface of the engraving 2 has the smallest depressions in the form of Microstructures M into which the engraving 2 pent active medium can escape during the forming process, so that a perfect surface of the workpiece W is guaranteed. The microstructures are here lined up in a meandering pattern.

In Fig. 5 ist eine kreisförmige Anordnung der Mikrostrukturen M dargestellt, die z.B. an einem tiefsten Punkt einer Gravur 2 liegen können.5 is a circular arrangement of the Microstructures M are shown which e.g. at a deepest Point of an engraving 2 may lie.

Die Herstellung dieser Mikrostrukturen M kann beispielsweise durch Laserbearbeitung, elektroerosive Bearbeitung, Ultraschallerosion, Einritzen, Einätzen oder durch andere geeignete Abtragungsverfahren erfolgen. In äquivalenter Form können auch auf die Gravur Partikel aufgebracht werden, (z.B. durch Lithographie) durch welche die Mikrostrukturen entstehen. Die Form, die Größe und der Abstand der Mikrostrukturen kann je nach Bedarf gewählt werden. The production of these microstructures M can for example by laser machining, electroerosive Machining, ultrasonic erosion, scoring, etching or by other suitable ablation procedures. In equivalent shape can also be engraved on particles applied (e.g. by lithography) through which the microstructures arise. The shape, the size and the Microstructure spacing can be selected as required become.

Die Aneinanderreihung der Mikrostrukturen kann kreuzförmig, linienförmig, kreisförmig, meanderförmig oder in anderen Strukturen oder Formen erfolgen.
In Fig. 4 sind dabei zwei Varianten mit meanderförmigem, und kreisförmigem Linienverlauf der Mikrostrukturen dargestellt.
Bei der Umformung z.B. dünner Folien mit Luft wird eine Blasenbildung durch die Mikrostrukturen vermieden, da das Wirkmedium in die Mikrostrukturen ausweichen kann.
Es ist weiterhin erstmalig möglich, mit diesen Mikrostrukturen in Bereichen hohen Verschleißes ein Schmiermitteldepot anzulegen und somit den Verschleiß entscheidend zu verringern.
Bei sehr geschmierten Werkstücken wird dieses Schmiermitteldepot z.B. aufgefüllt und bei zu wenig geschmierten Teilen durch den wirkenden Druck bei Anpressen der Bauteilwandung an die Gravur wieder abgegeben. Die Notlaufeigenschaften des Werkzeuges werden somit überraschender Weise entscheidend verbessert. Weiterhin kann eine Einsparung von Schmiermittel am Werkstück erfolgen.
Eine definierte Beeinflussung des Materialflusses ist z.B. durch eine Aufrauhung der Gravur mit den Mikrostrukturen ebenfalls möglich.
Durch die Mikrostrukturen kann für eine nachfolgende Beschichtung des Werkstückes eine Werkstückoberfläche mit günstigeren Hafteigenschaften erzeugt werden. The arrangement of the microstructures can be cross-shaped, linear, circular, meandering or in other structures or shapes.
4 shows two variants with meandering and circular lines of the microstructures.
When forming thin foils with air, for example, the microstructures avoid the formation of bubbles, since the active medium can escape into the microstructures.
It is also possible for the first time to create a lubricant depot with these microstructures in areas of high wear and thus to significantly reduce wear.
In the case of very lubricated workpieces, this lubricant depot is filled, for example, and if the parts are not lubricated enough, the lubricant is released by the pressure when the component wall is pressed against the engraving. The emergency running properties of the tool are thus surprisingly significantly improved. Furthermore, lubricants can be saved on the workpiece.
A defined influence on the material flow is also possible, for example, by roughening the engraving with the microstructures.
The microstructures can be used to produce a workpiece surface with more favorable adhesive properties for a subsequent coating of the workpiece.

Die Größe der Mikrostrukturen sollte vorzugsweise zwischen 10 und 100 µm liegen, um diese nicht an der Werkstückoberfläche sichtbar werden zu lassen.The size of the microstructures should preferably be between 10 and 100 microns are around this not to the To make the workpiece surface visible.

Claims (9)

Werkzeuggravur eines Umformwerkzeuges zum Umformen mittels Wirkmedium, wobei das Werkzeug eine Druckmittelzuführung (4) für das Wirkmedium und eine Gravur (2) entsprechend der gewünschten Endkontur des Werkstückes (W) aufweist, dadurch gekennzeichnet, daß die Gravur (2) mit Mikrostrukturen (M) versehen ist.Tool engraving of a forming tool for forming by means of the active medium, the tool having a pressure medium supply (4) for the active medium and an engraving (2) corresponding to the desired final contour of the workpiece (W), characterized in that the engraving (2) with microstructures (M) is provided. Werkzeuggravur nach Anspruch 1, dadurch gekennzeichnet, daß die Mikrostrukturen (M) die Oberflächenqualität des Werkstückes (W) nicht negativ beeinflussen und geeignet sind, während des Anpressens des Werkstücks (W) an die Gravur (2) beim Innenhochdruckumformen das Wirkmedium aufzunehmen und einer Deformierung durch örtlichen Stau des Wirkmediums zwischen Gravur (2) und Werkstück (W) entgegenwirken
und/oder die Hafteigenschaften des Werkstucks gezielt zu beeinflussen
und/oder Schmiermittel aufzunehmen und als Schmiermitteldepot zu dienen
und/oder den Materialfluß des Werkstückes beim Umformen zu beeinflussen. Tool engraving according to claim 1, characterized in that the microstructures (M) do not negatively influence the surface quality of the workpiece (W) and are suitable, during the pressing of the workpiece (W) on the engraving (2) during hydroforming to absorb the active medium and counteract a deformation due to local accumulation of the active medium between the engraving (2) and the workpiece (W)
and or to specifically influence the adhesive properties of the workpiece
and or Take up lubricant and serve as a lubricant depot
and or to influence the material flow of the workpiece during forming. Werkzeuggravur nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Mikrostrukturen (M) eine definierte Größe, Form und Anordnung aufweisen.Tool engraving according to claim 1 or 2, characterized in that the microstructures (M) have a defined size, shape and arrangement. Werkzeuggravur nach einem der Ansprüche von 1 bis 3, dadurch gekennzeichnet, daß die Mikrostrukturen (M) eine Abmessung in der Größenordnung von einem Molekül des Wirkmediums bis ca. 100µm Breite und 100µm Tiefe oder 100µm Höhe aufweisen.Tool engraving according to one of claims 1 to 3, characterized in that the microstructures (M) have a dimension in the order of magnitude of one molecule of the active medium up to approximately 100 µm wide and 100 µm deep or 100 µm high. Werkzeuggravur nach einem der Ansprüche von 1 bis 4, dadurch gekennzeichnet, daß die Mikrostrukturen (M) an der Gravur (2) ganzflächig oder an definierten Positionen angeordnet sind.Tool engraving according to one of claims 1 to 4, characterized in that the microstructures (M) on the engraving (2) are arranged over the entire surface or at defined positions. Werkzeuggravur nach Anspruch 5, dadurch gekennzeichnet, daß die Mikrostrukturen (M) in Gravurbereichen, in welchen sich das Wirkmedium aufstaut und in welchen dadurch Deformationen des Werkstücks (W) auftreten kann
und/oder in Gravurbereichen, mit die Oberflächenstruktur des Werkstücks (W) gezielt beeinflußt werden soll
und/oder in Gravurbereichen, in denen ein hoher Verschleiß auftritt
und/oder in Gravurbereichen, mit denen der Werkstofffluß beeinflußt werden soll
angeordnet sind. Tool engraving according to claim 5, characterized in that the microstructures (M) in engraving areas in which the active medium builds up and in which deformations of the workpiece (W) can occur
and or in engraving areas with which the surface structure of the workpiece (W) is to be influenced in a targeted manner
and or in engraving areas where high wear occurs
and or in engraving areas with which the material flow is to be influenced
are arranged. Werkzeuggravur nach einem der Ansprüche von 1 bis 6, dadurch gekennzeichnet, daß die Mikrostrukturen (M) linienförmig, kreisförmig, meanderförmig oder in anderen Formen aneinandergereiht sind.Tool engraving according to one of claims 1 to 6, characterized in that the microstructures (M) are lined up in a line, in a circle, in a meandering manner or in other forms. Werkzeuggravur nach einem der Ansprüche von 1 bis 7, dadurch gekennzeichnet, daß sie mit durch Laserbearbeitung, elektroerosive Bearbeitung, Ultraschallerosion, Einritzen, Einätzen oder andere Abtragungsverfahren erzeugten Mikrostrukturen (M) versehen ist.Tool engraving according to one of claims 1 to 7, characterized in that it is provided with microstructures (M) produced by laser machining, electroerosive machining, ultrasonic erosion, scoring, etching or other ablation processes. Werkzeuggravur nach einem der Ansprüche von 1 bis 6, dadurch gekennzeichnet, daß sie mit durch Lithographie oder andere Auftragsverfahren erzeugte Mikrostrukturen (M) aufweist.Tool engraving according to one of claims 1 to 6, characterized in that it has microstructures (M) produced by lithography or other application processes.
EP99113024A 1998-07-24 1999-07-06 Engraved forming tool for forming by means of a pressure medium Expired - Lifetime EP0974411B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833550 1998-07-24
DE19833550A DE19833550B4 (en) 1998-07-24 1998-07-24 Forming tool for forming by means of a pressure medium

Publications (2)

Publication Number Publication Date
EP0974411A1 true EP0974411A1 (en) 2000-01-26
EP0974411B1 EP0974411B1 (en) 2001-11-14

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ID=7875319

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EP99113024A Expired - Lifetime EP0974411B1 (en) 1998-07-24 1999-07-06 Engraved forming tool for forming by means of a pressure medium

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Country Link
US (1) US6286351B1 (en)
EP (1) EP0974411B1 (en)
AT (1) ATE208667T1 (en)
DE (2) DE19833550B4 (en)
ES (1) ES2169581T3 (en)

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DE102010037958A1 (en) * 2010-10-04 2012-04-05 Matthias Schmidt Method for manufacturing forming tool e.g. embossing tool for seals, involves forming recess in operative setting surface section of forming tool blank using laser beam
EP2314461A3 (en) * 2009-10-19 2014-03-26 Samsung Electronics Co., Ltd. Patterning apparatus and patterning method using the same

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US20040129052A1 (en) * 2003-01-06 2004-07-08 Krajewski Paul Edward Method of reducing cycle time for metal forming
DE102004041024B4 (en) * 2004-08-25 2006-07-06 Thyssenkrupp Steel Ag Method and device for producing a longitudinally welded hollow profile
DE102008002736A1 (en) * 2008-06-27 2009-12-31 Robert Bosch Gmbh Device for processing plate in nano-structured mold part, has pressure generating unit for generating pressure or stress deformation, and nano-structured structure forming unit for forming nano-structured structure in area of mold part
CN104511529A (en) * 2013-09-30 2015-04-15 国立高雄第一科技大学 Bending die with surface micro-structure and bending punch thereof
DE102014000944B3 (en) * 2014-01-24 2015-04-02 Frauenhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method and device for producing multi-scale surface-structured hollow profiles by means of media-assisted forming
CN113231526B (en) * 2021-05-28 2023-03-24 威海盈创金属成形科技有限公司 Internal pressure automatic forming device and method for large-diameter cylindrical part

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EP2314461A3 (en) * 2009-10-19 2014-03-26 Samsung Electronics Co., Ltd. Patterning apparatus and patterning method using the same
DE102010037958A1 (en) * 2010-10-04 2012-04-05 Matthias Schmidt Method for manufacturing forming tool e.g. embossing tool for seals, involves forming recess in operative setting surface section of forming tool blank using laser beam
DE102010037958B4 (en) * 2010-10-04 2012-04-26 Matthias Schmidt Method for producing a forming tool for seals or individual layers of seals, forming tool, seal and press

Also Published As

Publication number Publication date
DE19833550A1 (en) 2000-02-03
ATE208667T1 (en) 2001-11-15
US6286351B1 (en) 2001-09-11
DE19833550B4 (en) 2005-10-27
EP0974411B1 (en) 2001-11-14
ES2169581T3 (en) 2002-07-01
DE59900418D1 (en) 2001-12-20

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