WO1999025503A1 - Method and device for producing a bifurcation on a hollow profile section - Google Patents

Method and device for producing a bifurcation on a hollow profile section Download PDF

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Publication number
WO1999025503A1
WO1999025503A1 PCT/DE1998/003355 DE9803355W WO9925503A1 WO 1999025503 A1 WO1999025503 A1 WO 1999025503A1 DE 9803355 W DE9803355 W DE 9803355W WO 9925503 A1 WO9925503 A1 WO 9925503A1
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WO
WIPO (PCT)
Prior art keywords
piston
hollow profile
pull
slip
producing
Prior art date
Application number
PCT/DE1998/003355
Other languages
German (de)
French (fr)
Inventor
Friedhelm GÜNTHER
Christian Wolff-Jesse
Christoph Skudelny
Original Assignee
Mannesmann Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mannesmann Ag filed Critical Mannesmann Ag
Priority to DE19881742T priority Critical patent/DE19881742D2/en
Priority to AU18684/99A priority patent/AU1868499A/en
Publication of WO1999025503A1 publication Critical patent/WO1999025503A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/24—Deep-drawing involving two drawing operations having effects in opposite directions with respect to the blank
    • 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
    • B21D26/037—Forming branched tubes

Definitions

  • the invention relates to a method for producing a branch on a
  • domes can be produced by an internal high-pressure forming process as a preliminary stage of a branch in thin-walled hollow profiles by means of a hydraulic active medium.
  • the closed nature of the dome can be broken by punching a hole against and / or in the direction of the internal high pressure.
  • the object of the invention is to provide a method for producing a branch on a hollow profile, in which the branch has a defined inner contour.
  • the method according to the invention is characterized in that the known internal high-pressure forming process for forming a dome is followed by an inverted pull directed against the internal high pressure. If you connect the pull-over with a calibration, then you create a defined contact surface that can be used to easily arrange a line, a lever or the like A hole punching can follow the caliber process, but the hole punching can also be an integral part of the caliber
  • a device which consists of a piston which is axially displaceable in a guide-forming recess of the die comprising the hollow profile. This displacement will predominantly take place transversely to the longitudinal axis of the hollow profile Annular piston includes, which are both dependent in the so-called piggyback process or independently
  • Figure 1 in a longitudinal section a first exemplary embodiment of a device designed according to the invention
  • the hollow body 1 to be formed is inserted in a die consisting of two die halves 2, 3 omitted
  • the interior 6 of the hollow body 1 is subjected to high internal pressure p, and after the flow limit has been exceeded, the material flows into the recess 7 provided in the upper die half 3 so that there is no tearing in the lid area 8 of the dome, depending on the degree of shaping the stepped piston 13 explained below is moved in a controlled manner in order to avoid a reduction in the wall thickness in the most heavily loaded curved area 11 of the hollow body 1 Material pushed axially from the outside.
  • the arrows 12, 12 illustrate the axial replenishment.
  • a stepped piston 13 is arranged in the recess 7 of the upper die half 3. This has a guide section 9 adapted to the clear width 14 of the recess 7 and an adjoining, pull-out section 10 having a smaller diameter.
  • the stepped piston 13 is moved axially transversely to the longitudinal axis of the hollow body 1 and presses the cover area 8 of the dome inwards (see FIG. 2).
  • FIG. 2 shows a second in the same longitudinal section as FIG. 1
  • the same reference numerals have been used for the same parts.
  • Arranged in the recess 7 forming a guide is an annular piston 17 which, as the arrows 18 show, is axially displaceable.
  • This annular piston 17 corresponds approximately to the guide section 9 according to the design of the piston in FIG. 1.
  • a piston 15 which is axially displaceable independently thereof is arranged.
  • the displaceability of this piston 15 is indicated by the arrow 16.
  • the lid area 8 of the former dome is pressed inward when the piston 15 moves.
  • the interior 6 of the hollow body 1 remains under a fixed or adapted high internal pressure p ⁇ . This prevents the material from wandering sideways.
  • Figure 3 shows the last step, the calibration.
  • the annular piston 17 After reaching the end position of the piston 15, the annular piston 17 is axially displaced independently of it and presses with its annular end face onto the everted area.
  • a straight flattening 19 is formed, which is favorable for a connection of any kind.
  • a branch is obtained which has a straight and dimensionally accurate inner contour, so that, for example, correspondingly cylindrical elements therein Branch are axially movable.

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

Abstract

The invention relates to a method for producing a bifurcation on a hollow profile section in which a dome is formed by means of a hydraulic active medium during an interior high pressure forming operation. The invention is characterized in such a way that a reverse drawing follows, said reverse drawing being directed against the interior high pressure, the interior high pressure forming process. The invention also relates to a device for carrying out the method with a die (2, 3) which comprises the hollow profile section (1). A piston (13) is arranged in a recess (7) which forms a guide such that said piston can be axially displaced.

Description

Verfahren und Vorrichtung zur Herstellung eines Abzweiges an einem HohlprofilMethod and device for producing a branch on a hollow profile
Beschreibungdescription
Die Erfindung betrifft ein Verfahren zur Herstellung eines Abzweiges an einemThe invention relates to a method for producing a branch on a
Hohlprofil gemäß dem Oberbegriff des Patentanspruches 1.Hollow profile according to the preamble of claim 1.
Es ist bekannt, dass durch einen Innenhochdruck-Umformungsprozess sogenannte Dome als Vorstufe einer Abzweigung bei dünnwandigen Hohlprofilen mittels eines hydraulischen Wirkmediums herstellbar sind. Die Geschlossenheit des Domes kann aufgebrochen werden durch ein Stanzen eines Loches gegen den und/oder in Richtung des Innenhochdruckes.It is known that so-called domes can be produced by an internal high-pressure forming process as a preliminary stage of a branch in thin-walled hollow profiles by means of a hydraulic active medium. The closed nature of the dome can be broken by punching a hole against and / or in the direction of the internal high pressure.
Der Nachteil des bekannten Innenhochdruck-Umformprozesses ist darin zu sehen, dass damit keine Abzweige mit einer definierten Innenkontur herstellbar sind.The disadvantage of the known hydroforming process can be seen in the fact that no branches can be produced with a defined inner contour.
Aufgabe der Erfindung ist es, ein Verfahren zur Herstellung eines Abzweiges an einem Hohlprofil anzugeben, bei dem der Abzweig eine definierte Innenkoπtur aufweist.The object of the invention is to provide a method for producing a branch on a hollow profile, in which the branch has a defined inner contour.
Diese Aufgabe wird ausgehend vom Oberbegriff in Verbindung mit den kennzeichnenden Merkmalen des Patentanspruches 1 gelöst. Vorteilhafte Ausgestaltungen sowie eine Vorrichtung zur Durchführung des Verfahrens sind Bestandteil von Unteransprüchen.This object is achieved on the basis of the preamble in conjunction with the characterizing features of patent claim 1. Advantageous refinements and a device for carrying out the method are part of subclaims.
Das erfindungsgemäße Verfahren ist dadurch gekennzeichnet, daß sich an den bekannten Innenhochdruck-Umformungsprozess zur Ausformung eines Domes ein gegen den Innenhochdruck gerichtetes Stülpziehen anschließt. Verknüpft man das Stülpziehen mit einem Kalibrieren, dann schafft man eine definierte Anlagefläche, die in einfacher Weise zur Anordnung einer Leitung, eines Hebels oder dergleichen nutzbar ist An den Kalibπervorgang kann sich ein Lochstanzen anschließen, das Lochstanzen kann aber auch integraler Bestandteil des Kalibnerens sein Das Stulpziehen selbst kann gegen einen auf einen bestimmten Wert festgelegten Innenhochdruck oder gegen einen an den Grad des erreichten Stulpziehens anpaßbaren Innenhochdruck erfolgenThe method according to the invention is characterized in that the known internal high-pressure forming process for forming a dome is followed by an inverted pull directed against the internal high pressure. If you connect the pull-over with a calibration, then you create a defined contact surface that can be used to easily arrange a line, a lever or the like A hole punching can follow the caliber process, but the hole punching can also be an integral part of the caliber
Zur Durchfuhrung des Verfahrens wird eine Vorrichtung verwendet, die aus einem Kolben besteht, der in einer eine Fuhrung bildenden Ausnehmung des das Hohlprofil umfassenden Gesenkes axial verschiebbar ist Überwiegend wird diese Verschiebung quer zur Langsachse des Hohlprofils erfolgen Für die gewünschte Kalibrierung wird vorzugsweise der Kolben von einem Ringkolben umfasst, die beide abhangig im sogenannten Huckepackverfahren oder unabhängig voneinander verschiebbar sindTo carry out the method, a device is used which consists of a piston which is axially displaceable in a guide-forming recess of the die comprising the hollow profile.This displacement will predominantly take place transversely to the longitudinal axis of the hollow profile Annular piston includes, which are both dependent in the so-called piggyback process or independently
In der Zeichnung wird anhand zweier Ausfuhrungsbeispiele das erfindungsgemaße Verfahren naher erläutert Es zeigenIn the drawing, the method according to the invention is explained in more detail on the basis of two exemplary embodiments
Figur 1 in einem Längsschnitt ein erstes Ausfuhrungsbeispiel für eine erfindungsgemaß ausgebildete VorrichtungFigure 1 in a longitudinal section a first exemplary embodiment of a device designed according to the invention
Figur 2 im gleichen Längsschnitt wie Figur 1 ein zweites AusfuhrungsbeispielFigure 2 in the same longitudinal section as Figure 1 shows a second embodiment
Figur 3 im gleichen Längsschnitt wie Figur 2 mit einem anschließendenFigure 3 in the same longitudinal section as Figure 2 with a subsequent
KalibrierenCalibrate
In Figur 1 ist in einem Längsschnitt ein erstes Ausfuhrungsbeispiel für eine erfindungsgemaß ausgebildete Vorrichtung dargestellt Der umzuformende Hohlkörper 1 ist in einem aus zwei Gesenkhalften 2, 3 bestehenden Gesenk eingelegt Die erforderliche seitliche Abdichtung der beiden Stirnseitenbereiche 4, 5 des Hohlkörpers 1 wurde der Einfachheit halber hier weggelassen Der Innenraum 6 des Hohlkörpers 1 wird mit Innenhochdruck p, beaufschlagt und nach Überschreiten der Fließgrenze fließt das Material in die in der oberen Gesenkhalfte 3 vorgesehene Ausnehmung 7 Damit es nicht zu einem Aufreißen im Deckelbereich 8 des Domes kommt, kann entsprechend dem Grad der Ausformung der nachfolgend erläuterte Stufenkolben 13 kontrolliert verfahren werden Um eine Reduktion der Wanddicke im am stärksten belasteten Krummungsbereich 11 des Hohlkörpers 1 zu vermeiden, wird von außen Material axial nachgeschoben. Die Pfeile 12, 12' verdeutlichen den axialen Nachschub. Nach der Ausformung des Domes erfolgt das eingentliche Stülpziehen. Dazu ist in der Ausnehmung 7 der oberen Gesenkhälfte 3 ein Stufenkolben 13 angeordnet. Dieser weist einen an die lichte Weite 14 der Ausnehmung 7 angepaßten Führungsabschnitt 9 und einen daran anschließenden, ein kleineren Durchmesser aufweisenden Stülpziehabschnitt 10 auf. Beim Stülpziehen wird der Stufenkoiben 13 axial quer zur Längsachse des Hohlkörpers 1 verfahren und drückt den Deckelbereich 8 des Domes nach innen (siehe Fig. 2).1 shows a first exemplary embodiment of a device designed according to the invention in a longitudinal section. The hollow body 1 to be formed is inserted in a die consisting of two die halves 2, 3 omitted The interior 6 of the hollow body 1 is subjected to high internal pressure p, and after the flow limit has been exceeded, the material flows into the recess 7 provided in the upper die half 3 so that there is no tearing in the lid area 8 of the dome, depending on the degree of shaping the stepped piston 13 explained below is moved in a controlled manner in order to avoid a reduction in the wall thickness in the most heavily loaded curved area 11 of the hollow body 1 Material pushed axially from the outside. The arrows 12, 12 'illustrate the axial replenishment. After the dome has been shaped, the pull is pulled out. For this purpose, a stepped piston 13 is arranged in the recess 7 of the upper die half 3. This has a guide section 9 adapted to the clear width 14 of the recess 7 and an adjoining, pull-out section 10 having a smaller diameter. When pulling over, the stepped piston 13 is moved axially transversely to the longitudinal axis of the hollow body 1 and presses the cover area 8 of the dome inwards (see FIG. 2).
Figur 2 zeigt in einem gleichen Längsschnitt wie Figur 1 ein zweitesFIG. 2 shows a second in the same longitudinal section as FIG. 1
Ausführungsbeispiel. Dabei sind für gleiche Teile gleiche Bezugszeichen verwendet worden. In der eine Führung bildenden Ausnehmung 7 ist ein Ringkolben 17 angeordnet, der, wie die Pfeile 18 zeigen, axial verschiebbar ist. Dieser Ringkolben 17 entspricht in etwa dem Führungsabschnitt 9 gemäß der Ausbildung des Kolbens in Fig. 1. Von der Bohrung des Ringkolbens 17 geführt, ist ein davon unabhängig axial verschiebbarer Kolben 15 angeordnet. Die Verschiebbarkeit dieses Kolbens 15 ist durch den Pfeil 16 gekennzeichnet. Der Deckelbereich 8 des ehemaligen Domes wird bei der Bewegung des Kolbens 15 nach innen gedrückt. Um eine entsprechende Gegenkraft aufzubauen, bleibt der Innenraum 6 des Hohlkörpers 1 unter einem festgelegten bzw. angepassten Innenhochdruck p \ . Dies verhindert ein seitliches Wegwandern des Materials.Embodiment. The same reference numerals have been used for the same parts. Arranged in the recess 7 forming a guide is an annular piston 17 which, as the arrows 18 show, is axially displaceable. This annular piston 17 corresponds approximately to the guide section 9 according to the design of the piston in FIG. 1. Guided by the bore of the annular piston 17, a piston 15 which is axially displaceable independently thereof is arranged. The displaceability of this piston 15 is indicated by the arrow 16. The lid area 8 of the former dome is pressed inward when the piston 15 moves. In order to build up a corresponding counterforce, the interior 6 of the hollow body 1 remains under a fixed or adapted high internal pressure p \. This prevents the material from wandering sideways.
Figur 3 zeigt den letzten Arbeitsschritt, das Kalibrieren. Nach Erreichen der Endlage des Kolbens 15 wird unabhängig davon der Ringkolben 17 axial verschoben und drückt mit seiner Ringstirnfläche auf den Stülpbereich. Hier kann man den Effekt derFigure 3 shows the last step, the calibration. After reaching the end position of the piston 15, the annular piston 17 is axially displaced independently of it and presses with its annular end face onto the everted area. Here you can see the effect of
Kalibrierung gut erkennen. Es wird eine gerade Abflachung 19 gebildet, die günstig ist für einen Anschluss jedweder Art. Nach dem Zurückfahren des Ringkkolbens 17 und des zentralen Kolbens 15 ergibt sich ein Abzweig, der eine gerade und maßgenaue Innenkontur aufweist, so dass beispielsweise entsprechend zylindrisch ausgebildete Elemente in diesem Abzweig axial bewegbar sind. Auf die Darstellung undRecognize calibration well. A straight flattening 19 is formed, which is favorable for a connection of any kind. After retracting the annular piston 17 and the central piston 15, a branch is obtained which has a straight and dimensionally accurate inner contour, so that, for example, correspondingly cylindrical elements therein Branch are axially movable. On the presentation and
Erläuterung des Lochstanzens der gestülpten Deckfläche 8 wird hier verzichtet. Explanation of the punching of the slipped top surface 8 is omitted here.

Claims

Patentansprüche claims
1. Verfahren zur Hersteilung eines Abzweiges an einem Hohlprofil, bei dem durch einen Innenhochdruck-Umformungsprozess mittels eines hydraulischen Wirkmediums ein Dom ausgeformt wird, dadurch gekennzeichnet, dass an den Innenhochdruck-Umformungsprozess sich ein gegen den innenhochdruck gerichtetes Stülpziehen anschließt.1. A method for producing a branch on a hollow profile, in which a dome is formed by an internal high-pressure forming process by means of a hydraulic active medium, characterized in that the inner high-pressure forming process is followed by an inverting pull directed against the internal high pressure.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Stülpziehen mit einem Kalibrieren verknüpft ist.2. The method according to claim 1, characterized in that the everting is linked to a calibration.
3. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß das Stülpziehen gegen einen auf einen bestimmten Wert festgelegten Innenhochdruck erfolgt.3. The method according to claims 1 and 2, characterized in that the slip pulling takes place against a fixed internal pressure to a certain value.
4. Verfahren nach den Ansprüchen 1 und 2 dadurch gekennzeichnet, daß das Stülpziehen gegen einen an den Grad des erreichten Stülpziehens anpaßbaren Innenhochdruck erfolgt.4. The method according to claims 1 and 2, characterized in that the slip pull against an adaptable to the degree of slip pull achieved internal high pressure.
5. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 mit einem das5. An apparatus for performing the method according to claim 1 with a
Hohlprofil umfassenden Gesenk, dadurch gekennzeichnet, dass in einer eine Führung bildenden Ausnehmung (7) im Gesenk (2,3) ein Kolben axial verschiebbar angeordnet ist.Die comprising a hollow profile, characterized in that a piston is arranged axially displaceably in a recess (7) forming a guide in the die (2, 3).
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass der Kolben als Stufenkolben (13) ausgebildet ist, mit einem an die Ausnehmung (7) angepaßten Führungsabschnitt (9) und einem einen kleineren Durchmesser aufweisenden Stülpziehabschnitt (10). 6. The device according to claim 5, characterized in that the piston is designed as a stepped piston (13) with a guide section (9) adapted to the recess (7) and a slip-pull section (10) having a smaller diameter.
7. Vorrichtung nach Anspruch 5 dadurch gekennzeichnet, daß der Kolben als Doppelkolben ausgebildet ist mit einem zentral angeordneten Kolben (15) und einen diesen umfassenden Ringkolben (17), die beide abhängig oder unabhängig voneinander verschiebbar sind. 7. The device according to claim 5, characterized in that the piston is designed as a double piston with a centrally arranged piston (15) and a ring piston comprising this (17), both of which are dependent or independently displaceable.
PCT/DE1998/003355 1997-11-14 1998-11-11 Method and device for producing a bifurcation on a hollow profile section WO1999025503A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19881742T DE19881742D2 (en) 1997-11-14 1998-11-11 Method and device for producing a branch on a hollow profile
AU18684/99A AU1868499A (en) 1997-11-14 1998-11-11 Method and device for producing a bifurcation on a hollow profile section

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1997151402 DE19751402A1 (en) 1997-11-14 1997-11-14 Method and device for producing a branch on a hollow profile
DE19751402.2 1997-11-14

Publications (1)

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WO1999025503A1 true WO1999025503A1 (en) 1999-05-27

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PCT/DE1998/003355 WO1999025503A1 (en) 1997-11-14 1998-11-11 Method and device for producing a bifurcation on a hollow profile section

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AU (1) AU1868499A (en)
DE (2) DE19751402A1 (en)
WO (1) WO1999025503A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10033771B4 (en) * 2000-07-12 2014-07-10 Volkswagen Ag Method and device for the production of double-walled openings and eversion of a breakthrough
DE10162440A1 (en) * 2001-12-19 2003-07-03 Bayerische Motoren Werke Ag forming press
EP1579931B1 (en) * 2004-03-24 2007-06-13 C.R.F. Società Consortile per Azioni Method for hydroforming a hollow body having at least a branch portion, and apparatus used for carrying out this method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712097A (en) * 1969-12-17 1973-01-23 Tno Device for the manufacture of a branch to a straight tube
JPS55144334A (en) * 1979-04-27 1980-11-11 Nippon Baruji Kogyo Kk Liquid pressure bulging method
US5799524A (en) * 1995-08-16 1998-09-01 Schafer Hydroforming Gmbh & Co. Pressure forming and piercing a hollow body

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3712097A (en) * 1969-12-17 1973-01-23 Tno Device for the manufacture of a branch to a straight tube
JPS55144334A (en) * 1979-04-27 1980-11-11 Nippon Baruji Kogyo Kk Liquid pressure bulging method
US5799524A (en) * 1995-08-16 1998-09-01 Schafer Hydroforming Gmbh & Co. Pressure forming and piercing a hollow body

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 014 (M - 052) 28 January 1981 (1981-01-28) *

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DE19881742D2 (en) 2000-10-26
AU1868499A (en) 1999-06-07
DE19751402A1 (en) 1999-06-02

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