EP1000677B1 - Procédé pour former une pièce par application d'une pression intérieure élevée - Google Patents

Procédé pour former une pièce par application d'une pression intérieure élevée Download PDF

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Publication number
EP1000677B1
EP1000677B1 EP99120812A EP99120812A EP1000677B1 EP 1000677 B1 EP1000677 B1 EP 1000677B1 EP 99120812 A EP99120812 A EP 99120812A EP 99120812 A EP99120812 A EP 99120812A EP 1000677 B1 EP1000677 B1 EP 1000677B1
Authority
EP
European Patent Office
Prior art keywords
tube
section
wall thickness
sections
inner tube
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
Application number
EP99120812A
Other languages
German (de)
English (en)
Other versions
EP1000677A2 (fr
EP1000677A3 (fr
Inventor
Conrad Dipl.-Ing. Oehlerking
Frank Dr. Welsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volkswagen AG
Original Assignee
Volkswagen 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 Volkswagen AG filed Critical Volkswagen AG
Publication of EP1000677A2 publication Critical patent/EP1000677A2/fr
Publication of EP1000677A3 publication Critical patent/EP1000677A3/fr
Application granted granted Critical
Publication of EP1000677B1 publication Critical patent/EP1000677B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D26/033—Deforming tubular bodies
    • B21D26/051—Deforming double-walled bodies
    • 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
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods

Definitions

  • the present invention relates to a method for producing a component by means of Hydroforming from a tube with at least one section different wall thickness.
  • the present invention also relates to such a tube.
  • IHU hydroforming process
  • DE 196 04 357 A1 describes a method for producing pipes with sections different wall thickness known from an initially flat sheet, in which first a targeted rolling deformation of the sheet in the rolling direction changing sheet thicknesses in certain areas. This results in one targeted partial wall thickness reduction. Then the rolled sheet cut, formed into a tube and joined along the butt edges. A such manufacturing with continuous material in a manufacturing process, however complex and costly.
  • DE 3610 481 A1 describes a further method for producing pipes with a or several inner wall thickenings known, the thickenings from one cylindrical tube manufactured by cutting processes and / or forming processes are.
  • the first step is: Machining processes or forming processes externally or externally and internally molded wall thickenings, which are preferably produced in a second step Cold hammers are formed or shaped inwards. This is also the case is a comparatively complex and costly process.
  • EP 0 733 540 B1 describes a method for producing a hollow profile for a Carrier structure of a motor vehicle by hydraulic expansion of a Output part, an extruded profile being used as the output part, which in Cross-section areas with different wall thicknesses.
  • the wall thickness of the The starting part is chosen so that the hydroforming process manufactured hollow profile has the necessary wall thickness at the required points.
  • the disadvantage of this is that for different hollow profiles with different wall thicknesses separate extruded profiles must be produced as the starting product each time.
  • the object of the present invention is therefore a method of the above Provide mentioned type, in which the wall thickness gradation with a paragraph-free outer contour can be reached in the simplest possible way.
  • the object of the invention is also a tube produced by said method
  • the solution is to first use a composite pipe by using an inner tube with a uniform wall thickness to generate the minimum a section of different wall thickness at least one outer pipe section is pushed on and then the assembled pipe High pressure forming process is subjected, so that the parts through the Shaping process are firmly connected to each other, according to the invention at least one end of an outer tube section is designed obliquely in cross section is, so that after the hydroforming process a substantially paragraph-free outer contour of the finished component results.
  • the outer contour then does not need any Post-processing to grind off any paragraphs or joints or in comparable postprocessing.
  • one or more can additional connections between the inner tube and the at least one outer Pipe section are produced, for example by laser welding or others Joining techniques. This ensures that the composite semi-finished product in the IHU tool does not slip.
  • These additional connections can, for example, after the forming process are produced in that the resulting component with a or several other components is connected.
  • a composite tube 10 which consists of an inner tube 11 and an outer tube section 12.
  • the inner tube 11 has the required component length.
  • the outer tube section 12 is in the manner of a sleeve completely pushed over the inner tube 11 so that it has a central region 11b covered and the outer areas 11a remain uncovered.
  • On the outer edges 13 and 14 of the outer tube section 12 are bevels extending inwards 15, 16 provided.
  • the inner tube 11 and the outer tube section 12 consist for example of a Sheet steel, which is formed into a tube and joined at the butt edges.
  • the Assembled tube 10 is a hydroforming process in the usual way subjected.
  • the resulting component 20 is schematic in FIG. 1b shown.
  • the component 20 consists of outer regions 21, which consist of the Inner tube 11 emerged and correspond to the area 11a designated in FIG. 1a and a thickened region 22, which consists of the region designated by 11b in FIG. 1a of the inner tube and the outer tube section 12 emerged.
  • the outer contour of the Component 20 has no shoulders, since the wall of the former inner tube perfectly to the oblique contour 15, 16 of the outer tube section 12 nestled.
  • connection points e.g. B. can be further solidified by laser welding or by other joining techniques.
  • This Connection points can be made before or after the forming process. There then the connection points made after the forming process, they can are generated that the component 20 with one or more any other Components is connected.
  • FIG. 2a shows a further exemplary embodiment of a composite tube 30 shown schematically and partially cut.
  • the composite pipe 30 consists of an inner tube 31 and three outer tube sections 32, 33, 34, which are partially are pushed over each other on the inner tube 31, so that an outer region 31a of the Inner tube 31 and the outer free ends 32a, 33a, 33b of the outer tube sections 32, 33, 34 remain uncovered.
  • the outer free ends 32a 33a and 34a of the outer Pipe sections 32, 33, 34 in turn have an inward bevel 32b, 33b, 34b.
  • the composite pipe 30 becomes a common one Subjected to hydroforming process.
  • the resulting component 40 is schematic and partially sectioned in Figure 2b shown.
  • the component 40 has a thin region 41 which emerges from the outer Region 31a of the inner tube 31 results, as well as gradually thickened regions, namely a single thickened area 42, a double thickened area 43 and one triple thickened area 44.
  • the thickened areas 42, 43, 44 result from the Addition of the wall thicknesses of the different outer ones partially pushed over each other Pipe sections 32, 33, 34.
  • the design of the outer free ensures Ends 32a, 33a, 34a of the outer tube sections 32, 33, 34 have a shoulder-free contour.
  • connection points between the inner tube 31 and the outer tube sections 32, 33, 34 are produced. However, these parts are already fixed by the shape connected with each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Powder Metallurgy (AREA)
  • Body Structure For Vehicles (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Claims (9)

  1. Procédé de formage d'une pièce (20, 40) par application d'une pression intérieure élevée à partir d'un tuyau ayant au moins une section à épaisseur de paroi différente, de manière telle qu'on utilise d'abord un tuyau assemblé (10, 30) en glissant sur un tuyau intérieur (11 ; 31) à épaisseur de paroi homogène, pour la création d'au moins une section à épaisseur de paroi différente, au moins une section de tuyau extérieure (12 ; 32, 33, 34) et en soumettant ensuite le tuyau assemblé au processus de formage par application d'une pression intérieure élevée, de manière à ce que les pièces (11, 12 ; 31, 32, 33, 34) soient assemblées fixement les unes aux autres par le processus de formage, caractérisé en ce qu'au moins une extrémité (13, 14 ; 32a, 33a, 34a) de l'au moins une section de tuyau extérieure (12 ; 32, 33, 34) soit conformée oblique dans sa section transversale, de sorte qu'il en résulte, après le processus de formage par application d'une pression intérieure élevée, un contour extérieur substantiellement dénué de talon de la pièce (20, 40).
  2. Procédé selon la revendication 1, caractérisé en ce que les sections de tuyau extérieures (12, 32, 33, 34) sont glissées complètement ou partiellement les unes sur les autres.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que, pour créer plusieurs sections d'épaisseur de paroi différente, plusieurs sections de tuyau extérieures (32, 33, 34) de diamètres différents sont glissées les unes sur les autres sur le tuyau intérieur (31).
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'avant et/ou après le processus de jonction, une ou plusieurs liaisons supplémentaires entre le tuyau intérieur (11 ; 31) et l'au moins une section de tuyau extérieure (12 ; 32, 33, 34) sont créées.
  5. Procédé selon la revendication 4, caractérisé en ce que l'une ou les plusieurs liaisons supplémentaires sont créées lors de la liaison de la pièce (20, 40) résultant du processus de formage par application d'une pression intérieure élevée avec une ou plusieurs autres pièces.
  6. Tuyau comportant au moins une section à épaisseur de paroi différente, notamment pour une utilisation dans un procédé selon l'une quelconque des revendications 1 à 5, s'agissant d'un tuyau assemblé (10, 30) qui présente un tuyau intérieur (11, 31) à épaisseur de paroi homogène sur lequel, afin de créer au moins une section à épaisseur de paroi différente, est glissée au moins une section de tuyau extérieure (12 ; 32, 33, 34), caractérisé en ce qu'au moins une extrémité (13, 14 ; 32a, 33a, 34a) de l'au moins une section de tuyau extérieure (12 ; 32, 33, 34) est conformée oblique dans sa section transversale.
  7. Tuyau selon la revendication 6, caractérisé en ce que les sections de tuyau extérieures (12 ; 32, 33, 34) sont glissées complètement ou partiellement les unes sur les autres.
  8. Tuyau selon la revendication 6 ou 7, caractérisé en ce qu'afin de créer plusieurs sections à épaisseur de paroi différente, plusieurs sections de tuyau extérieures (32, 33, 34) de diamètres différents sont glissées les unes sur les autres sur le tuyau intérieur (31).
  9. Tuyau selon l'une quelconque des revendications 6 à 8, caractérisé en ce qu'il présente une ou plusieurs liaisons supplémentaires entre le tuyau intérieur (11, 31) et l'au moins une section de tuyau (12 ; 32, 33, 34).
EP99120812A 1998-11-09 1999-10-21 Procédé pour former une pièce par application d'une pression intérieure élevée Expired - Lifetime EP1000677B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19851492 1998-11-09
DE19851492A DE19851492A1 (de) 1998-11-09 1998-11-09 Verfahren zum Herstellen eines Bauteils mittels Innenhochdruck-Umformen

Publications (3)

Publication Number Publication Date
EP1000677A2 EP1000677A2 (fr) 2000-05-17
EP1000677A3 EP1000677A3 (fr) 2001-04-25
EP1000677B1 true EP1000677B1 (fr) 2004-02-18

Family

ID=7887103

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99120812A Expired - Lifetime EP1000677B1 (fr) 1998-11-09 1999-10-21 Procédé pour former une pièce par application d'une pression intérieure élevée

Country Status (3)

Country Link
EP (1) EP1000677B1 (fr)
AT (1) ATE259685T1 (fr)
DE (2) DE19851492A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6609301B1 (en) * 1999-09-08 2003-08-26 Magna International Inc. Reinforced hydroformed members and methods of making the same
DE10221880B4 (de) * 2002-05-16 2007-03-15 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zur Herstellung eines verstärkten Rohrs, ein solches Rohr und dessen Verwendung
DE10230284B4 (de) * 2002-07-05 2008-10-16 Daimler Ag Verfahren und Vorrichtung zur Befestigung von Bauteilen an umfänglich geschlossensn Hohlprofilen
DE10357671A1 (de) * 2003-12-05 2005-07-07 Deutsches Zentrum für Luft- und Raumfahrt e.V. Herstellungsverfahren für ein Mehrschichtrohr zur Führung eines Wärmeübertragungsfluids und Mehrschichtrohr
DE102009032045A1 (de) * 2009-07-07 2011-01-20 Elb-Form Gmbh Doppelwandiges Rohr, Verfahren zu seiner Herstellung und seine Verwendung
GB2486224B8 (en) * 2010-12-07 2013-06-19 Europ Technical Ct Etc Steering Nsk Deutschland Gmbh Tailored thickness steering tube
DE102011113662A1 (de) * 2011-09-19 2013-03-21 Benteler Automobiltechnik Gmbh Strukturbauteil für ein Kraftfahrzeug mit einem hohlförmigen Grundprofil sowie Verfahren zu dessen Herstellung
CN113664064A (zh) * 2021-08-13 2021-11-19 山东钢铁集团日照有限公司 一种差厚管制管方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE548576C (de) * 1928-03-01 1933-02-03 Richard Krauss Dipl Ing Verfahren zur Herstellung von eisernen Hochdruckrohren
DE2709633C3 (de) * 1976-03-26 1981-04-23 Combustion Engineering, Inc., 06095 Windsor, Conn. Vorrichtung zum Befestigen einer Muffe in einer Rohrleitung
CA1139923A (fr) * 1979-02-28 1983-01-25 Toshio Yoshida Methode de production de canalisations composites multiparoi
JPS61266132A (ja) * 1985-05-21 1986-11-25 Musashi Seimitsu Ind Co Ltd 組立カムシヤフトの製造方法
US4759111A (en) * 1987-08-27 1988-07-26 Ti Automotive Division Of Ti Canada Inc. Method of forming reinforced box-selection frame members
DE19511970C2 (de) * 1995-04-18 1998-07-09 Werdau Fahrzeugwerk Verfahren zum Herstellen von verformten mehrwandigen Rohren mit Hohlräumen zwischen den Wandungen
DE19617219C2 (de) * 1996-04-30 1998-04-30 Daimler Benz Ag Verfahren zur Herstellung einer hohlen Welle

Also Published As

Publication number Publication date
DE59908570D1 (de) 2004-03-25
DE19851492A1 (de) 2000-05-11
EP1000677A2 (fr) 2000-05-17
EP1000677A3 (fr) 2001-04-25
ATE259685T1 (de) 2004-03-15

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