EP0904869B1 - Dispositif de formage à haute pression des profilés creux - Google Patents

Dispositif de formage à haute pression des profilés creux Download PDF

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Publication number
EP0904869B1
EP0904869B1 EP98115208A EP98115208A EP0904869B1 EP 0904869 B1 EP0904869 B1 EP 0904869B1 EP 98115208 A EP98115208 A EP 98115208A EP 98115208 A EP98115208 A EP 98115208A EP 0904869 B1 EP0904869 B1 EP 0904869B1
Authority
EP
European Patent Office
Prior art keywords
support ring
stop
sealing
ring
hollow section
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
EP98115208A
Other languages
German (de)
English (en)
Other versions
EP0904869A1 (fr
Inventor
Pierre Bonny
Thomas Hülsberg
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.)
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler 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 DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP0904869A1 publication Critical patent/EP0904869A1/fr
Application granted granted Critical
Publication of EP0904869B1 publication Critical patent/EP0904869B1/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
    • B21D26/045—Closing or sealing means

Definitions

  • the invention relates to a device for hydroforming of hollow profiles according to the preamble of the claim 1.
  • a generic device is known from DE 43 09 680 A1.
  • a sealing head of an axial plunger is the one to be sealed in the engraving of a hydroforming tool inserted hollow profile until a radial Shoulder of the sealing head on the front of the hollow profile comes into play.
  • the sealing head bears on its conical trained end two sealing rings in the direction of insertion from a baffle plate attached to the front of the end are secured against slipping out.
  • the near the flapper Sealing ring is an O-ring made of a soft rubber-elastic material, while the baffle plate seal made of polyamide exists and has a trapezoidal profile cross section.
  • the baffle plate is axial on the face of the sealing head screwed movably and has a bent edge, with which the O-ring can be loaded.
  • the sealing rings are like this trained that with little play to the hollow profile the sealing head can be inserted without hindrance.
  • the seal after filling the hollow profile with the pressure fluid the pressure fluid channel formed in the sealing head due to the created internal high pressure, which the baffle against presses the O-ring, which due to the slipping up on the contact surface that widens conically towards the axial ram spread the seal head end and thereby radially against the Hollow profile to be pressed.
  • the high pressure also affects the polyamide ring of the contact surface slide up, which is then through its wedge-like formation between the contact surface and the hollow profile jammed and by the pressure on the Hollow profile for additional sealing of the hollow profile leads.
  • the polyamide ring is placed in this position a stop for the O-ring towards the axial punch, so opposite to the direction of insertion, causing the O-ring by the axial pressure on the polayamide ring by means of the internal high pressure baffle plate deformed elastically and is driven radially apart.
  • the invention has for its object a generic To further develop the device so that in a simple manner and a reliable fluid high pressure density without deformation of the hollow profile Sealing is achieved so that a reliable process Forming with regard to stable pressure conditions at Hydroforming is made possible.
  • a relative movement of the support part to the sealing arrangement enables this being a stationary with respect to the hollow profile Position takes while the carrier part continues into the hollow profile can be inserted axially further.
  • the fixed support ring opposes, by loading the Support ring and the sealing element held thereon by means an actuating means rigidly attached to the carrier part radial expansion of the sealing element almost automatically triggered.
  • the sealing element is against the inner wall pressed of the hollow profile, whereby a sufficient fluid high pressure density Sealing of the hollow profile interior against the external environment is reached. This happens before filling so that no leaks occur.
  • the fluid high pressure is held at a stable height during forming, since the Preserve the quality of the seal until the end of the forming process remains.
  • one is reliable in terms of constant pressure Forming of the hollow profile possible.
  • no deformation of the hollow profile end since here only a soft one Radial seal from the inside to the inner wall of the hollow profile is pressed, whereby the hollow profile remains true to size and a any trimming of the squeezed hollow profile in the docking area of the sealing head on the hollow profile after the forming process resource-saving and process time-saving.
  • the hollow profile is not squeezed, the withdrawal forces become of the axial ram considerably reduced.
  • An internal high-pressure forming tool 1 is shown in the figure, in the engraving 2 a hollow profile 3 is introduced, the internal high-pressure forming tool 1 in the closed position located.
  • a sealing head 4 of a hydraulic actuated axial plunger inserted, by means of which the material of the hollow profile 3 during the forming process for reliable forming with a high degree of forming in the direction of the forming location can be replenished.
  • the sealing head 4 comprises a hollow cylindrical support member 5, the cavity of which one Pressure fluid channel 6 for introducing the pressure fluid into the hollow profile 3 forms and with a high-pressure fluid generating system is fluidly connected, a sealing arrangement 7, which on the Outer peripheral surface 8 of the carrier part 5 is held axially displaceable and a stop plate 9 facing away from the insertion direction End face 10 of the carrier part 5 screwed is.
  • the sealing arrangement 7 includes one with its peripheral shape the circumferential contour of the hollow profile 3 following annular Stop body 11, a support ring 12, an outer that Sealing element forming soft rubber-elastic O-ring 13 and an inner O-ring 14 made of a material with similar Properties like the O-ring 13.
  • the O-ring 13 can also consist of a spring steel.
  • the stop body 11 lies with a little play with it Circumferential surface 15 all around on the engraving 2 of the forming tool 1 and with its inner wall 16 on the outer peripheral surface 8 of the carrier part 5.
  • the stop body 11 On its in the direction of insertion End face 17, the stop body 11 has a coaxial lying sleeve-shaped extension 18 smaller diameter than that of the stop body 11, wherein the extension 18 in one strong press compound circumferentially forming a pressure piece 19 Washer made of a highly wear-resistant material, which abuts the end face 17 of the stop body 11.
  • the extension 18 extending in the insertion direction has one starting from its end 29 pointing in the direction of insertion Threaded bore 21 running parallel to the direction of insertion in the manner of a blind hole in which a pin 22 with a screwed to one end 23 of the external thread 24 which is the connecting means between the stop body 11 and the support ring 12 forms.
  • an annular collar 25 on which the stop body 11 rests.
  • the pin 22 has an axially spaced apart from the collar 25 further ring collar 26 on which a sleeve-shaped extension 27 of the support ring 12 abuts the end face, which with a smaller Diameter than that of the support ring 12 on the opposite of End face 28 of the support ring 12 pointing in the direction of insertion coaxially is arranged.
  • the inner circumference and the outer circumference 36 of the extension 27 of the support ring 12 are otherwise in their Connection position with the corresponding circumferences of the extension 18 of the stop body 11, whereby with respect to the in shape and dimension of the same inner circumference of the extensions 18 and 27 of support ring 12 and stop body 11 a manufacturing technology simple colinear guidance can be carried out on the carrier part 5 is.
  • the extension 27 of the support ring 12 has one the support ring 12 common to the threaded bore 21 of the stop body 11 coaxial feedthrough 30 through which the support ring 12 attached to the pin 22 until it rests on the collar 26 is.
  • the end 31 of the pin 22 on the support ring side has an internal thread 32 on, whereby by screwing a suitable Screw 33 from the face pointing in the direction of insertion 34 of the support ring 12 from the support ring 12 between the collar 26 and the screw head 35 is screwed.
  • the support ring 12 is thus positioned exactly relative to the stop body 11 and also has a defined position on pin 22.
  • these two sealing arrangement elements connected by a plurality of pins 22 distributed over their circumference.
  • stop body 11 Support ring 12 corresponding screw.
  • the lanyard should in any case of the stop body 11 and the Support ring 12 be releasable, because an interchangeability of worn Parts of the seal assembly 7 can be guaranteed got to.
  • the carrier part 5 has an annular collar 37 which arranged between the stop body 11 and the support ring 12 and with its edge 38 to near the inner wall 39 of the hollow profile 3 extends.
  • This extension close to the hollow profile of the collar 37 or the design of its diameter in such a way that there is a clearance fit with respect to the hollow profile 3 of the collar 37 results, is used for radial support of the Hollow section 3 during a pushing of the hollow section 3 during of the forming process.
  • the collar 37 has a collar on both sides in the axial direction 41 on the extension 27 and the extension 13 each engages behind and on the contact surface for the O-ring 13 forming Outer circumference 36 of the extension 27 on the one hand and on the outer circumference of the extension 18 on the other hand.
  • the collar 41 closes at its edge 42 facing the edge flush with the Edge 38 of the ring collar 37, with the support ring 12 facing Collar in this embodiment with its in the direction of insertion facing end face 43 in a relaxed position the sealing arrangement 7 rests on the O-ring 13. However, this can also axially spaced from the O-ring 13 in the relaxed position his.
  • the end face 20 of the hollow profile 3 is used to seal the Hollow profile 3, the carrier part 5 by means of the axial punch pushed in the direction of insertion.
  • the C-ring 13 is from Collar 41 of the collar 37 axially squeezed, whereby the O-ring 13 spreads apart radially and on the inner wall 39 of the hollow profile is pressed with high force.
  • the Ring collar 37 thus forms the actuating means due to its collar 41 for the sealing ring 13.
  • the free displacement mentioned must be so large that the O-ring 13 or in general the sealing element in sufficient for a secure seal Dimensions is compressed, but it may only be so large that the O-ring 13 due to excessive crushing none Takes damage.
  • the extensions 18 and 27 and the support ring 12 and the stop body 11 can their inner walls with a wear-resistant sliding film, for example be coated from molybdenum sulfide, what the service life the sealing head 4 increases and the smoothness of the Sealing arrangement 7 significantly increased relative to the carrier part 5.
  • the carrier part tapers approximately at the level of the position of the O-ring 13 5 revolving in a stage 46 at which the on the support member 5 inserted O-ring 14 is present. On the opposite Side of the support ring 12 with its end face 28 on the O-ring 14 on.
  • the diameter of the support ring 12 is otherwise dimensioned such that that the sealing head 4 with play in the hollow profile 3rd is insertable, however, the clearance 49 between the support ring 12 and hollow section 3 designed so tight that for a sealing Squeezing the O-ring 13 through the collar 41 of the collar 37 there is sufficient resistance and the O-ring 13 with the squeezing impingement not over the edge of the Support ring 12 is pressed, which is a shearing and thus resulting in damage to the O-ring 13.
  • the O-ring 13 an elongated one is also conceivable use elastic hollow drilled plugs, which the sealing contact surface on the hollow section 3 is considerably enlarged and thus the security of an adequate seal even after guarantees a long service life.
  • the contact surface of the extension 27 of the support ring 12 for the O-ring 13 may differ from the cylindrical design of the embodiment shown also be conical. This is done by applying of the O-ring 13 through the collar 41 of the collar 37 the O-ring 13 alone due to the slipping up expanded in the direction of insertion and spread to the Hollow profile wall 39 pressed, whereby the O-ring 13 only with reduced squeezing force must be applied to the required To achieve sealing. The wear of the O-ring 13 reduced.
  • the sealing head 4 together with the axial punch can be done in a simpler manner Track the shortening hollow profile 3 to the same extent are accepted without loss of tightness must become. It is also possible to use the axial ram if necessary to apply an additional axial force to the hollow profile 3, so that the material flow to the forming point during forming is forced with high degrees of deformation, i.e. it will Pushed the hollow profile material to the forming point. To do this unhindered to execute, the stop body 11 and the pressure piece 19 designed in a ring shape, creating an even pressure load when the sealing arrangement 7 is in contact with the stop body 11 given on the end face 20 of the hollow profile 3 is.
  • the interaction of carrier part 5 and support ring 12 for spreading the O-ring 13 thereby caused that the carrier part 5 has an external toothing carries that with an internal toothing of the support ring 12 such combs that a simple translatory insertion movement of the Support part 5 after the abutment body 11 abuts the hollow profile 3 spreads the support ring 12 forcibly guided.
  • the Support ring 12 is composed of different circular segments, on the outer periphery of the O-ring 13 is held. This form of spreading can also be done by a rotatory Movement of the carrier part 5 take place.
  • the carrier part 5 can also be designed as a conical mandrel, the support ring 12 as a solid within certain limits elastic, but with a much greater Shore hardness than the O-ring 13 be formed or in the form of inelastic Circular segments can exist.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)
  • Sealing Devices (AREA)
  • Clamps And Clips (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Claims (13)

  1. Dispositif pour la mise en forme, sous haute pression intérieure, de profilés creux (3) au moyen d'un outil (4) de mise en forme sous haute pression intérieure, dans l'espace intérieur duquel le profilé creux (3) peut s'appliquer et comportant au moins un poinçon axial qui possède une tête d'étanchéité (4) qui, par un tronçon, peut s'introduire avec jeu dans le profilé creux (3) et qui présente une partie support (5), qui comporte un canal (6) pour le fluide sous pression, sur laquelle est maintenu un agencement d'étanchéité (7) et qui est rigidement reliée au poinçon axial, ainsi qu'une surface de butée qui, en position de service de la tête d'étanchéité (4) s'appuie frontalement contre l'extrémité du profilé creux, l'agencement d'étanchéité (7) comportant au moins un élément d'étanchéité (13) qui peut s'expanser radialement pour venir en appui périphérique étanche contre la face intérieure du profilé creux (3),
       caractérisé par le fait
       que l'agencement d'étanchéité (7) comporte une bague d'appui (12) qui porte l'élément d'étanchéité (13), qui est guidée sur la partie support (5) avec liberté de coulissement axial par rapport à cette partie et qui, lors de l'accostage de la tête d'étanchéité (4) sur le profilé creux (3), plonge dans ce profilé creux (3), ainsi qu'une pièce de butée (il) qui représente la surface de butée de la tête d'étanchéité (4) contre le profilé creux (3) et qui est solidairement reliée à la bague d'appui (12), et par le fait que la partie support (5) présente un moyen de manoeuvre (30) qui, lors de l'appui de la pièce de butée (11) contre le profilé creux (3), par suite d'une poursuite du déplacement axial de la partie support (5) par rapport à la bague d'appui (12), en collaboration avec la bague d'appui (12), contraint l'élément d'étanchéité (13) à s'expanser.
  2. Dispositif selon la revendication 1,
       caractérisé par le fait que le moyen de manoeuvre est un collet annulaire (13) de la partie support (5) qui présente un passage axial (40) par lequel passe un moyen de liaison (22) reliant la bague d'appui (12) avec la pièce de butée (11), collet annulaire qui s'étend radialement entre l'élément d'étanchéité (13), tenu sur la bague d'appui (12), et la pièce de butée (11) et qui, par un rebord (41) prévu dans sa zone de bordure, est conçu recouvrant la surface d'appui (36) de la bague d'appui (12) pour l'élément d'étanchéité (13), de sorte que, lors de l'appui de la pièce de butée (11) contre le profilé creux (3), sous l'action du rebord (41) qui se déplace axialement entre l'élément d'étanchéité (13) et la pièce de butée (11), l'élément d'étanchéité (13) peut être contraint à s'expanser.
  3. Dispositif selon la revendication 2,
       caractérisé par le fait
       que la surface d'appui (36) de la bague d'appui (12) pour l'élément d'étanchéité (13) est de forme cylindrique.
  4. Dispositif selon la revendication 2,
       caractérisé par le fait
       que la surface d'appui (36) de la bague d'appui (12) pour l'élément d'étanchéité (13) est prévu conique de façon à aller en diminuant en direction du collet annulaire (37).
  5. Dispositif selon la revendication 1,
       caractérisé par le fait
       que l'élément d'étanchéité est un joint torique (13) en élastomère ou en acier à ressort.
  6. Dispositif selon la revendication 1,
       caractérisé par le fait
       que l'élément d'étanchéité est un bouchon longitudinal élastique.
  7. Dispositif selon la revendication 2,
       caractérisé par le fait
       que la pièce de butée (11) s'appuie contre la partie support (5) et que la pièce de butée (11) ainsi que la bague d'appui (12) sont, sur leur paroi intérieure s'appuyant contre la partie support (5), revêtues d'un film glissant résistant à l'usure.
  8. Dispositif selon la revendication 2,
       caractérisé par le fait
       que, contre sa face frontale orientée vers le profilé creux (3), la pièce de butée (11) présente une pièce de pression (19) qui est constituée d'un matériau résistant à l'usure.
  9. Dispositif selon la revendication 2,
       caractérisé par le fait
       que sur sa face frontale (28) orientée vers la pièce de butée (11), la bague d'appui (12) présente un prolongement en forme de douille (27) dont la face frontale (44) forme une contre-butée pour la face frontale (45) du collet annulaire (13) de la partie support (5) orientée selon la direction d'introduction, lors d'un mouvement relatif de la partie support (5),
  10. Dispositif selon la revendication 2,
       caractérisé par le fait
       que sur la partie support (5) est fixée une plaque de butée (9) qui est disposée du côté opposé au collet annulaire de la pièce de butée (11) et à une certaine distance de celle-ci et forme une contre-butée pour la pièce de butée (11) lors d'un mouvement relatif de la partie support (5).
  11. Dispositif selon la revendication 1,
       caractérisé par le fait
       que la pièce de butée (11) a une forme annulaire qui suit le contour périphérique du profilé creux (3).
  12. Dispositif selon la revendication 2,
       caractérisé par le fait
       que le moyen de liaison est formé d'une broche (22) sur la première extrémité (31), munie d'un taraudage (32), de laquelle est enfichée la bague d'appui (12) qui présente un perçage axial de passage correspondant (30) et qui, en position enfichée, s'appuie contre un collet annulaire (26) de la broche (22) prévu entre les extrémités (23, 31) de la broche (22), et qui, par la face frontale (34) de la bague d'appui (12) orientée selon la direction d'introduction, est vissée avec la broche (22) au moyen d'une vis (33) vissée dans le taraudage de la broche (22), l'autre extrémité (23) de la broche (22) portant un filetage extérieur (24) par lequel celle-ci se visse dans un taraudage (21) de la pièce de butée (11).
  13. Dispositif selon la revendication 2,
       caractérisé par le fait
       qu'en plus de l'élément d'étanchéité (13), l'agencement d'étanchéité (7) comporte un joint d'étanchéité intérieur (14) que la partie support (5) porte sur sa surface périphérique extérieure (8) et qui s'appuie contre la périphérie intérieure de la bague d'appui (12).
EP98115208A 1997-09-26 1998-08-13 Dispositif de formage à haute pression des profilés creux Expired - Lifetime EP0904869B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19742443 1997-09-26
DE19742443A DE19742443C2 (de) 1997-09-26 1997-09-26 Vorrichtung zum Innenhochdruckumformen von Hohlprofilen

Publications (2)

Publication Number Publication Date
EP0904869A1 EP0904869A1 (fr) 1999-03-31
EP0904869B1 true EP0904869B1 (fr) 2000-11-29

Family

ID=7843656

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98115208A Expired - Lifetime EP0904869B1 (fr) 1997-09-26 1998-08-13 Dispositif de formage à haute pression des profilés creux

Country Status (4)

Country Link
US (1) US6012317A (fr)
EP (1) EP0904869B1 (fr)
AT (1) ATE197776T1 (fr)
DE (2) DE19742443C2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1426123B1 (fr) * 2002-12-06 2007-02-28 Thyssenkrupp Automotive AG Méthode et dispositif de formage à haute pression interne
DE10305074B4 (de) * 2003-02-07 2015-02-05 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Getriebewelle sowie Verfahren zur Herstellung einer Getriebewelle
SE528938C2 (sv) * 2005-02-08 2007-03-20 Ortic Ab Hydroformningsenhet
US8910500B2 (en) 2012-09-10 2014-12-16 National Research Council Of Canada Low friction end feeding in tube hydroforming
DE102016209072A1 (de) * 2016-05-25 2017-11-30 Bayerische Motoren Werke Aktiengesellschaft Dichtstempel zum stirnseitigen Abdichten eines Hohlprofils
US10252389B2 (en) * 2017-07-05 2019-04-09 Kennametal Inc. Quick-change clamping unit for toolholder and method of using same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2837810A (en) * 1955-06-17 1958-06-10 Flexonics Corp Method of producing fittings
US4393674A (en) * 1981-06-25 1983-07-19 Air-Mo Hydraulics, Inc. Hydraulic chuck device for engagement with the inside of a tube
US5233854A (en) * 1992-05-11 1993-08-10 General Motors Corporation Press apparatus for hydroforming a tube
US5233856A (en) * 1992-05-29 1993-08-10 General Motors Corporation External seal unit for tube hydroforming
DE4309680A1 (de) * 1993-03-25 1994-09-29 Huber & Bauer Gmbh Vorrichtung zum Innenhochdruckumformen eines rohrförmigen Rohlings
US5363544A (en) * 1993-05-20 1994-11-15 Benteler Industries, Inc. Multi-stage dual wall hydroforming
US5445002A (en) * 1993-08-16 1995-08-29 Ti Corporate Services Limited Fill and pressurization apparatus
US5644829A (en) * 1993-08-16 1997-07-08 T I Corporate Services Limited Method for expansion forming of tubing

Also Published As

Publication number Publication date
DE19742443C2 (de) 1999-07-22
US6012317A (en) 2000-01-11
ATE197776T1 (de) 2000-12-15
EP0904869A1 (fr) 1999-03-31
DE59800360D1 (de) 2001-01-04
DE19742443A1 (de) 1999-04-22

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