EP0484789B1 - Method and device for producing holes in the wall of a hollow bodied workpiece - Google Patents
Method and device for producing holes in the wall of a hollow bodied workpiece Download PDFInfo
- Publication number
- EP0484789B1 EP0484789B1 EP91118373A EP91118373A EP0484789B1 EP 0484789 B1 EP0484789 B1 EP 0484789B1 EP 91118373 A EP91118373 A EP 91118373A EP 91118373 A EP91118373 A EP 91118373A EP 0484789 B1 EP0484789 B1 EP 0484789B1
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- EP
- European Patent Office
- Prior art keywords
- workpiece
- shaped area
- die
- ram
- passage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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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
- 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
- B21D26/023—Deforming sheet bodies including an additional treatment performed by fluid pressure, e.g. perforating
-
- 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
- B21D22/10—Stamping using yieldable or resilient pads
- B21D22/105—Stamping using yieldable or resilient pads of tubular products
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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
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/007—Explosive cutting or perforating
Definitions
- the invention relates to a method for producing an opening in the wall of a workpiece designed as a hollow body and to a tool for carrying out the method according to the preamble of claim 3.
- the object of the invention is to expand these possible uses of the latter production method.
- the method according to the invention is used during the forming of the workpiece using the internal high-pressure method (claim 2).
- the hydroforming process is preferably used for the production of differently shaped hollow parts and is a material-saving process that meets the requirements of a resource-saving manufacturing technology.
- the operation of this forming process is such that a blank workpiece is placed in a mold, subjected to high internal pressure with the aid of a suitable hydraulic fluid and is formed while simultaneously applying axial pressure to the tube wall. Axial pressure and internal pressure cause the workpiece blank to lie against the inner contour of the mold.
- the material is brought into the plastic state, which is maintained during the entire forming process, taking material hardening and any tool forces into account.
- a particularly suitable tool for carrying out the method according to the invention is based on tools as described in "expanding tubes by internal high pressure forming", sheet metal tube profiles, volume 35, no. 3, March 1988, page 175, image 2 3 specified.
- the tool has both a sharp cutting edge and "braking contours" in the edge region of a formation, the latter having the task of specifically preventing the material in the region of the cutting edge from flowing again, a defined predetermined breaking line is reliably formed in an advantageous manner.
- a support surface which is preferably arranged centrally in the formation, as described in claim 4, limits the material stretch in the inner region of the workpiece wall to be cut out and at the same time increases the material stretch in the cantilever region.
- the cut-out workpiece wall which may still be stuck in the formation, can be pressed out after the opening has been made.
- Fig. 1 shows the latter method in schematic form.
- a workpiece 1 designed as a tube is opened (distance a o )
- Tool 2 which is composed of upper and lower tool 2.1, 2.2 and is also moved during the forming process, is inserted.
- a cavity 3 of the workpiece 1 is filled with a liquid active medium via an inflow opening 4.
- the forming takes place, during which the upper and lower tools 2.1, 2.2 move towards one another with an axial force F a, with the simultaneous effect of an internal pressure p i generated by the active medium, until the desired expansion shape is achieved in the workpiece 1.
- the internal pressure p i is to be selected as a function of, in particular, the material and wall thickness of the workpiece 1.
- Reference number X identifies that tool area in which an opening is made in the manner according to the invention during the forming process. Further details can be found in FIG. 2.
- FIG. 2 shows a section of the lower tool 2.2, which has on its inner wall surface 5 a shape 6 corresponding to the contour (for example rotationally symmetrical) of the desired workpiece opening.
- a plunger 8 which can be acted upon by pressure force F s, projects through a bore 7 in the lower tool 2.2 into the formation 6, its end face 9 (with a rounded peripheral edge) serving as a support surface for the workpiece 1 during the manufacture of the opening.
- the end face 9 limits the material stretch in this area and at the same time increases the material stretch in the cantilevered area of the formation 6.
- a peripheral edge 10 of the formation 6 is sharp-edged (90 °) and serves as a cutting edge. Furthermore, near this edge 10, the inner wall surface 5 of the lower tool 2.2 is also equipped with circumferential serrated elevations 13, which act as braking contours and are intended to prevent the workpiece material from tiling in order to tear the workpiece wall along the cutting edge (edge 10) when it reaches one to favor certain internal pressure P i .
- a ratio of d / D 1/3 should be maintained with regard to the ram cross-section d, the exact ratio depending in particular on the workpiece material and wall thickness and should be selected accordingly.
- the distance T by which the end face 9 of the plunger 8 is set back relative to the inner wall surface 5 of the lower tool 2.2 is to be selected taking into account the diameter d, D and the material properties (maximum elongation at break ⁇ in%) of the workpiece 1.
- the height and foot width of the serrated elevations 13 should correspond approximately to the wall thickness s of the workpiece 1.
- a rounding should be present, the radius R of which should at least correspond to the workpiece wall thickness s.
- a depth T 1 should be selected for the formation 6, for which at least the following should apply: T 1 ⁇ 1.5 T.
- the plunger 8 also serves as an ejector, since it can happen that when the workpiece area to be cut breaks, it jams within the formation 6.
- the ejection takes place before or during the opening of the upper and lower tools 2.1, 2.2 by a corresponding mechanical device that actuates the plunger 8.
- the tool opening movement could be used to initiate the plunger movement.
- the ejection could also take place in a second step.
- a support element could possibly be dispensed with.
- T ⁇ D should then be observed.
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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)
- Insertion Pins And Rivets (AREA)
Description
Die Erfindung bezieht sich auf ein Verfahren zum Herstellen eines Durchbruches in der Wandung eines als Hohlkörper ausgebildeten Werkstückes gemäß Oberbegriff des Patentanspruches 1 sowie auf ein Werkzeug zur Durchführung des Verfahrens gemäß Oberbegriff des Patentanspruches 3.The invention relates to a method for producing an opening in the wall of a workpiece designed as a hollow body and to a tool for carrying out the method according to the preamble of claim 3.
Im Stand der Technik sind eine Reihe von Möglichkeiten bekannt (Bohren, Stanzen usw.), um beispielsweise rotationssymmetrische oder auch eine bestimmte Formkontur aufweisende Durchbrüche in die Wandung eines Werkstückes einzubringen.A number of possibilities are known in the prior art (drilling, punching, etc.) in order, for example, to introduce openings that are rotationally symmetrical or also have a specific shape contour into the wall of a workpiece.
Auch ist es bekannt (GB-A 11 66 532, US-A 27 32 897), Performationen in einem Hohlkörper dadurch herzustellen, daß dessen Wandung sich auf der einen Seite an einem perforierten Stützkörper abstützt, während die gegenüberliegende Seite einem unter hohen Druck stehenden Medium (hydraulisch, pneumatisch) ausgesetzt wird.It is also known (GB-A 11 66 532, US-A 27 32 897) to produce perforations in a hollow body in that the wall is supported on one side on a perforated support body, while the opposite side is under high pressure Medium (hydraulic, pneumatic) is exposed.
Aufgabe der Erfindung ist es, diese Anwendungsmöglichkeiten des letztgenannten Herstellungsverfahrens zu erweitern.The object of the invention is to expand these possible uses of the latter production method.
Gelöst wird diese Aufgabe erfindungsgemäß durch eine Verfahrensweise, wie sie im Kennzeichen des Patentanspruches 1 angegeben ist.This object is achieved according to the invention by a procedure as specified in the characterizing part of patent claim 1.
Dadurch lassen sich in vorteilhafter Weise zwei an sich bekannte Werkstück-Bearbeitungsverfahren in einem einzigen Bearbeitungsschritt durchführen.As a result, two workpiece machining methods known per se can advantageously be carried out in a single machining step.
In besonders vorteilhafter Weiterbildung wird das erfindungsgemäße Verfahren während eines Umformens des Werkstückes unter Anwendung des Innenhochdruckverfahrens angewendet (Patentanspruch 2).In a particularly advantageous development, the method according to the invention is used during the forming of the workpiece using the internal high-pressure method (claim 2).
Das Innenhochdruckumformen (von vorzugsweise rohrförmigen Werkstücken) ist im Stand der Technik bekannt und in der einschlägigen Literatur beschrieben (DE-Z "Bänder Bleche Rohre" 6/1986, Seiten 117 bis 120; DE-Z "Bleche Rohre Profile" 35 (1988) 3, Seiten 175 bis 180; "Fortschrittsberichte" VDI Reihe 2 Nr. 142, VDI-Verlag; jeweils mit Querverweisen zu weiterführendem Schrifttum).Internal high pressure forming (of preferably tubular workpieces) is known in the prior art and described in the relevant literature (DE-Z "Bänder Bleche Rohr" 6/1986, pages 117 to 120; DE-Z "Bleche Rohr Profile" 35 (1988) 3, pages 175 to 180; "Progress Reports" VDI
Das Innenhochdruckumformverfahren wird vorzugsweise zur Herstellung unterschiedlich geformter Hohlteile angewendet und ist ein materialsparendes Verfahren, das den Forderungen einer ressourcensparenden Fertigungstechnik entspricht. Die Arbeitsweise dieses Umformverfahrens ist dabei dergestalt, daß ein Werkstück-Rohling in eine Form gelegt, unter Zuhilfenahme eines geeigneten Hydraulikfluids mit hohem Innendruck beaufschlagt und unter gleichzeitiger Beaufschlagung mit axialem Druck auf die Rohrwandung umgeformt wird. Axialdruck und Innendruck bewirken, daß sich der Werkstück-Rohling an die Innenkontur der Form anlegt. Dabei wird der Werkstoff in den plastischen Zustand versetzt, der während des gesamten Umformvorganges unter Berücksichtigung von Werkstoffverfestigung und etwaiger Werkzeugkräfte aufrechterhalten bleibt.The hydroforming process is preferably used for the production of differently shaped hollow parts and is a material-saving process that meets the requirements of a resource-saving manufacturing technology. The operation of this forming process is such that a blank workpiece is placed in a mold, subjected to high internal pressure with the aid of a suitable hydraulic fluid and is formed while simultaneously applying axial pressure to the tube wall. Axial pressure and internal pressure cause the workpiece blank to lie against the inner contour of the mold. The material is brought into the plastic state, which is maintained during the entire forming process, taking material hardening and any tool forces into account.
Ein besonders geeignetes Werkzeug zur Durchführung des erfindungsgemäßen Verfahrens ist ausgehend von Werkzeugen, wie sie in "Aufweitstauchen von Rohren durch Innenhochdruckumformung", Blech Rohre Profile, Band 35, Nr. 3, März 1988, Seite 175, Bild 2, beschrieben sind, in Patentanspruch 3 angegeben.A particularly suitable tool for carrying out the method according to the invention is based on tools as described in "expanding tubes by internal high pressure forming", sheet metal tube profiles, volume 35, no. 3, March 1988, page 175,
Dadurch, daß das Werkzeug im Randbereich einer Ausformung sowohl eine scharfe Schnittkante als auch "Bremskonturen" aufweist, wobei letztere die Aufgabe haben, den Werkstoff im Bereich der Schnittkante gezielt am Nachfließen zu hindern, wird in vorteilhafter Weise eine definierte Sollbruchlinie zuverlässig gebildet.Because the tool has both a sharp cutting edge and "braking contours" in the edge region of a formation, the latter having the task of specifically preventing the material in the region of the cutting edge from flowing again, a defined predetermined breaking line is reliably formed in an advantageous manner.
Eine in der Ausformung vorzugsweise mittig angeordnete Abstützfläche, wie in Patentanspruch 4 beschrieben, begrenzt die Werkstoffstreckung im inneren Bereich der auszuschneidenden Werkstückwandung und erhöht gleichzeitig die Werkstoffstreckung im frei tragenden Bereich.A support surface which is preferably arranged centrally in the formation, as described in
Ist die Abstützfläche gleichzeitig Teil eines Auswerfers, wie dies in Anspruch 5 angegeben ist, so kann nach Herstellung des Durchbruches die in der Ausformung gebenenenfalls noch festsitzende ausgeschnittene Werkstückwandung herausgedrückt werden.If the support surface is at the same time part of an ejector, as specified in
Die Einhaltung der Randbedingungen, wie sie mit den Patentansprüchen 6 und 7 angegeben sind, gewährleisten eine zuverlässige Herstellung des Durchbruches.Compliance with the boundary conditions, as specified in
Die Erfindung ist nachstehend anhand eines Ausführungsbeispieles beschrieben, wobei die Herstellung des Durchbruches während eines Umformens eines Werkstückes unter Anwendung des Innenhochdruckverfahrens erfolgt. Die zugehörige Zeichnung zeigt in
- Fig. 1
- eine Schematische Darstellung von Werkstück und Werkzeug in der Anordnung für ein rotationssymmetrisches Aufweitstauchen im geöffneten Werkzeug als eines der Grundverfahren des Innenhochdruckumformens und
- Fig. 2
- eine vergrößerte Darstellung des Bereiches X gemäß Fig. 1, in dem im Werkstück ein Durchbruch hergestellt wird.
- Fig. 1
- a schematic representation of the workpiece and tool in the arrangement for a rotationally symmetrical expansion dipping in the open tool as one of the basic methods of hydroforming and
- Fig. 2
- an enlarged view of the area X of FIG. 1, in which an opening is made in the workpiece.
Das Innenhochdruckumformverfahren kennt im wesentlichen drei Grundverfahren, nämlich das partielle Ausbauchen im geschlossenen Werkzeug, das rotationssymmetrische Aufweiten im geschlossenen Werkzeug und das rotationssymmetrische Aufweitstauchen im geöffneten Werkzeug. Fig. 1 zeigt in schematisierter Form das letztgenannte Verfahren. Dabei wird ein als Rohr ausgebildetes Werkstück 1 in ein geöffnetes (Abstand ao), aus Ober- und Unterwerkzeug 2.1, 2.2 sich zusammensetzendes und während des Umformvorganges mitbewegtes Werkzeug 2 eingelegt. Nach dem Einspannen und der Abdichtung mittels geeigneter Dichtringe (nicht dargestellt) wird ein Hohlraum 3 des Werkstückes 1 über eine Zuflußöffnung 4 mit einem flüssigen Wirkmedium gefüllt. Anschließend erfolgt die Umformung, wobei sich während des Umformvorganges Ober- und Unterwerkzeug 2.1, 2.2 solange mit einer Axialkraft Fa bei gleichzeitiger Wirkung eines vom Wirkmedium erzeugten Innendruckes pi aufeinander zubewegen, bis die gewünschte Aufweitform im Werkstück 1 erreicht ist. Der Innendruck pi ist in Abhängigkeit von insbesondere Werkstoff und Wandstärke des Werkstückes 1 zu wählen. Nach Abschluß des Umformvorganges weisen Ober- und Unterwerkzeug 2.1, 2.2 noch einen Abstand a₁ auf.The hydroforming process essentially knows three basic processes, namely partial bulging in the closed tool, rotationally symmetrical widening in the closed tool and rotationally symmetrical widening in the open tool. Fig. 1 shows the latter method in schematic form. Here, a workpiece 1 designed as a tube is opened (distance a o ),
Ein detaillierteres Eingehen auf das Innenhochdruckumformverfahren dürfte entbehrlich sein. Es genügt an dieser Stelle ein Verweis auf die eingangs angegebene, insgesamt sehr umfangreiche Literatur hierzu.A more detailed discussion of the hydroforming process may not be necessary. At this point, it is sufficient to refer to the very extensive literature given at the beginning.
Mit der Bezugsziffer X ist derjenige Werkzeugbereich näher gekennzeichnet, in dem während des Umformvorganges auf erfindungsgemäße Weise ein Durchbruch hergestellt wird. Nähere Einzelheiten ergeben sich aus Fig. 2.Reference number X identifies that tool area in which an opening is made in the manner according to the invention during the forming process. Further details can be found in FIG. 2.
Fig. 2 zeigt ausschnittsweise das Unterwerkzeug 2.2, welches auf seiner inneren Wandfläche 5 eine der Kontur (beispielsweise rotationssymmetrisch) des gewünschten Werkstück-Durchbruches entsprechende Ausformung 6 aufweist. In deren mittlerem Bereich ragt durch eine Bohrung 7 im Unterwerkzeug 2.2 ein mittels Druckkraft Fs beaufschlagbarer Stößel 8 in die Ausformung 6 hinein, wobei dessen Stirnfläche 9 (mit abgerundeter Umfangskante) dem Werkstück 1 während der Herstellung des Durchbruches als Stützfläche dient.2 shows a section of the lower tool 2.2, which has on its inner wall surface 5 a shape 6 corresponding to the contour (for example rotationally symmetrical) of the desired workpiece opening. In its central region, a
Die Stirnfläche 9 begrenzt die Werkstoffstreckung in diesem Bereich und erhöht gleichzeitig die Werkstoffstreckung im frei tragenden Bereich der Ausformung 6.The end face 9 limits the material stretch in this area and at the same time increases the material stretch in the cantilevered area of the formation 6.
Eine umlaufende Kante 10 der Ausformung 6 ist scharfkantig ausgeführt (90°) und dient insoweit als Schnittkante. Desweiteren ist nahe dieser Kante 10 die innere Wandfläche 5 des Unterwerkzeuges 2.2 mit ebenfalls umlaufenden zackenförmigen Erhebungen 13 ausgestattet, die als Bremskonturen wirken und ein Nachfliesen des Werkstück-Werkstoffes verhindern sollen, um das Einreißen der Werkstückwandung entlang der Schnittkante (Kante 10) bei Erreichen eines bestimmten Innendruckes Pi zu begünstigen.A
Dabei kommt es bei zunehmendem Innendruck pi zu einem verstärktem Einschneiden des Werkstoffes. Außerdem ist in der Schneidkanteneinflußzone ein gleichmäßiger Festigkeitszustand gegeben, so daß an der Kante 10 die Beanspruchung steigt. Ist der Werkstoff etwa in der Größenordnung 1/3 s (s = Werkstück-Wandstärke) eingeschnitten, so kommt es zum Bruch.With increasing internal pressure p i, there is an increased incision in the material. In addition, there is a uniform strength state in the cutting edge influence zone, so that the stress increases at the
Ist die Ausformung 6 kreisförmig (Durchmesser D), so sollte bezüglich des Stößelquerschnittes d etwa ein Verhältnis von d/D = 1/3 eingehalten werden, wobei das genaue Verhältnis insbesondere von Werkstück-Werkstoff und -Wandstärke abhängig und entsprechend zu wählen ist.If the shape 6 is circular (diameter D), a ratio of d / D = 1/3 should be maintained with regard to the ram cross-section d, the exact ratio depending in particular on the workpiece material and wall thickness and should be selected accordingly.
Der Abstand T, um den die Stirnfläche 9 des Stößels 8 gegenüber der inneren Wandfläche 5 des Unterwerkzeuges 2.2 zurückversetzt ist, ist unter Berücksichtigung der Durchmesser d, D und der Werkstoffeigenschaften (maximale Bruchdehnung δ in %) des Werkstückes 1 zu wählen.The distance T by which the end face 9 of the
Höhe und Fußbreite der zackenförmigen Erhebungen 13 sollten in etwa der Wandstärke s des Werkstückes 1 entsprechen. Im Übergangsbereich zwischen Mantelfläche 14 und Stirnfläche 9 des Stößels 8 sollte eine Rundung vorhanden sein, deren Radius R mindestens der Werkstückwandstärke s entsprechen sollte. Für die Ausformung 6 ist eine Tiefe T₁ zu wählen, für die zumindest gelten sollte: T₁ ≧ 1,5 T.The height and foot width of the
Der Stößel 8 dient gleichzeitig als Auswerfer, da es durchaus passieren kann, daß beim Bruch des auszuschneidenden Werkstückbereiches sich dieser innerhalb der Ausformung 6 verklemmt. Das Auswerfen erfolgt vor oder während des Öffnens von Ober- und Unterwerkzeug 2.1, 2.2 durch eine entsprechende mechanische Einrichtung, die den Stößel 8 betätigt. Dabei könnte die Werkzeug-Öffnungsbewegung genutzt werden, um die Stößelbewegung einzuleiten. Selbstverständlich könnte das Auswerfen auch in einem zweiten Arbeitsschritt erfolgen.The
Soweit die in das Werkstück 1 einzubringende Durchbrechung ein gewisses Maß (z. B. 0̸ < 8 mm) unterschreitet, könnte gegebenenfalls auf ein Stützelement verzichtet werden. Für eine kreisförmige Ausformung sollte dann T ≧ D eingehalten werden.If the opening to be made in the workpiece 1 falls below a certain dimension (eg 0̸ <8 mm), a support element could possibly be dispensed with. For a circular shape, T ≧ D should then be observed.
Claims (7)
- Process for producing a passage in the wall of a workpiece (1) constructed as a hollow body, the workpiece (1) being inserted into a die (2) which in the region of the envisaged passage is provided with a shaped area (6) with a rim contour that matches the passage, and the cavity (3) in the workpiece (1) being acted upon by an operating medium up to an internal pressure (pi) that causes the wall of the workpiece to be incised along an edge (10) of the shaped area (6), characterised in that the workpiece (1) is inserted into a die (2) allowing the workpiece (1) to be enlarged within certain limits as a result of the action of deformation forces, and that the passage is produced simultaneously with a re-shaping operation, in particular an enlarging operation, to bring about an altered contour of the workpiece (1).
- Process according to claim 1, characterised in that the re-shaping of the workpiece (1) is carried out using the internal high-pressure re-shaping process.
- Die with upper and lower dies (2.1, 2.2) to receive the workpiece (1) and an operating-medium inflow port (4) for carrying out the process according to claim 1, characterised by a shaped area (6) disposed in the region of the envisaged passage, the interface from one internal die wall surface (5) to the shaped area (6) being sharp-edged (10) and near to the latter the wall surface (5) being equipped with inward-projecting, zig-zag shaped raised areas (13) extending along the edge (10).
- Die according to claim 3, characterised in that in the central region of the shaped area (6) a ram (8) projects into the shaped area (6) through a bore (7) in the lower die (2.2), the end surface (9) of said ram (8) supporting the workpiece (1) being deformed in said region.
- Die according to claim 4, characterised in that the ram (8) acts as an ejector and is adapted to be acted on by a compressive force Fs.
- Die according to claim 4, characterised in that when the ram (8) and shaped area (6) are circular in cross-section the ratio d:D is 1:3, where d is the diameter of the ram and D the diameter of the shaped area.
- Die according to claim 3, characterised in that when the shaped area (6) is circular its depth T₁ is always greater than its diameter D.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4035625A DE4035625A1 (en) | 1990-11-09 | 1990-11-09 | METHOD FOR PRODUCING A BREAKTHROUGH IN THE WALL OF A WORKPIECE DESIGNED AS A HOLLOW BODY, AND TOOL FOR CARRYING OUT THE METHOD |
| DE4035625 | 1990-11-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0484789A1 EP0484789A1 (en) | 1992-05-13 |
| EP0484789B1 true EP0484789B1 (en) | 1995-04-12 |
Family
ID=6417926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91118373A Expired - Lifetime EP0484789B1 (en) | 1990-11-09 | 1991-10-29 | Method and device for producing holes in the wall of a hollow bodied workpiece |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0484789B1 (en) |
| DE (2) | DE4035625A1 (en) |
| ES (1) | ES2071886T3 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19858971A1 (en) * | 1998-12-19 | 2000-07-06 | Audi Ag | Component deforming process using fluid, involving cutting by fluid jet cutting |
| DE10343430B3 (en) * | 2003-09-19 | 2004-07-01 | Audi Ag | Manufacturing process for making tube with thickened wall in central portion has two annular pistons with profiled ends forced toward each other while fluid flows in through holes in outer tube |
| DE102004001847A1 (en) * | 2004-01-13 | 2005-08-04 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for cutting workpieces incorporates a high pressure fluid cutter especially gas pressure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4322063C2 (en) * | 1993-07-02 | 1999-07-15 | Schaefer Hydroforming Gmbh | Method and device for cutting out a section of a wall of a hollow body produced by the hydroforming process |
| US5398533A (en) * | 1994-05-26 | 1995-03-21 | General Motors Corporation | Apparatus for piercing hydroformed part |
| DE19506067C1 (en) * | 1995-02-22 | 1996-06-20 | Krupp Ag Hoesch Krupp | Aperture cutter for pressure moulded items |
| DE19508632C2 (en) * | 1995-03-10 | 2002-09-19 | Audi Ag | Method for connecting a first component to a second component |
| DE19530056B4 (en) * | 1995-08-16 | 2004-09-09 | Schuler Hydroforming Gmbh & Co. Kg | Method and device for producing T-shaped or at least one dome-like hollow body |
| DE19532860A1 (en) * | 1995-09-06 | 1997-03-13 | Behr Gmbh & Co | Method and tool for producing a one-piece manifold |
| GB2312390A (en) * | 1996-04-23 | 1997-10-29 | Clf International Limited | Techniques and apparatus for cutting a workpiece |
| US5666840A (en) * | 1996-06-13 | 1997-09-16 | General Motors Corporation | Method for piercing two aligned holes in a hydroformed tube |
| DE19647963C2 (en) * | 1996-11-20 | 1998-11-26 | Daimler Benz Ag | Method and device for producing holes on the circumference of hollow profiles |
| DE19647962C1 (en) * | 1996-11-20 | 1998-04-16 | Daimler Benz Ag | Method and device for producing holes on the circumference of a hollow profile |
| DE19649629C2 (en) * | 1996-12-02 | 1999-01-07 | Forschungsges Umformtechnik | Flexible tool for hydroforming a sheet |
| DE19724037C2 (en) * | 1997-06-06 | 2000-08-31 | Audi Ag | Process for cutting a hollow body |
| DE19747607A1 (en) * | 1997-10-28 | 1999-05-06 | Forschungsges Umformtechnik | Punching method for hollow workpieces |
| DE19805275B4 (en) * | 1998-02-11 | 2004-07-15 | Dr. Meleghy Hydroforming Gmbh & Co. Kg | Method and device for making an opening in a wall |
| DE19852976B4 (en) * | 1998-11-17 | 2005-06-23 | Benteler Ag | Door frame for a passenger car |
| DE19911125C1 (en) * | 1999-03-12 | 2000-11-16 | Forschungsges Umformtechnik | Workpiece cutting/perforation forms a pressure zone with a pressure medium on one side with a cutting edge and a spaced auxiliary cutting edge on the other workpiece side giving cut edges with low distortion and small flash height |
| DE10029321C1 (en) * | 2000-06-20 | 2001-05-31 | Daimler Chrysler Ag | Shaping of a passage in a hollow profile uses a shaping tool with high inner pressure with a die to form facing shaped sections and a die cutting edge to work with the high inner fluid pressure |
| DE10260980A1 (en) * | 2002-12-21 | 2004-07-01 | Bayerische Motoren Werke Ag | forming press |
| DE102005013689B3 (en) * | 2005-03-21 | 2006-01-05 | Forschungsgesellschaft Umformtechnik Mbh | Separating or piercing device for workpiece deformed by internal pressure has elastic membrane subject to pressure for separating or piercing |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2732897A (en) * | 1956-01-31 | musser | ||
| NL6615105A (en) * | 1965-11-09 | 1967-05-10 |
-
1990
- 1990-11-09 DE DE4035625A patent/DE4035625A1/en not_active Withdrawn
-
1991
- 1991-10-29 ES ES91118373T patent/ES2071886T3/en not_active Expired - Lifetime
- 1991-10-29 EP EP91118373A patent/EP0484789B1/en not_active Expired - Lifetime
- 1991-10-29 DE DE59105166T patent/DE59105166D1/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19858971A1 (en) * | 1998-12-19 | 2000-07-06 | Audi Ag | Component deforming process using fluid, involving cutting by fluid jet cutting |
| DE19858971C2 (en) * | 1998-12-19 | 2000-10-12 | Audi Ag | Process for reshaping a component with the help of a fluid and tool for carrying out the process |
| DE10343430B3 (en) * | 2003-09-19 | 2004-07-01 | Audi Ag | Manufacturing process for making tube with thickened wall in central portion has two annular pistons with profiled ends forced toward each other while fluid flows in through holes in outer tube |
| DE102004001847A1 (en) * | 2004-01-13 | 2005-08-04 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for cutting workpieces incorporates a high pressure fluid cutter especially gas pressure |
| DE102004001847B4 (en) * | 2004-01-13 | 2007-01-18 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method and device for cutting a workpiece |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2071886T3 (en) | 1995-07-01 |
| DE4035625A1 (en) | 1992-05-14 |
| EP0484789A1 (en) | 1992-05-13 |
| DE59105166D1 (en) | 1995-05-18 |
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