EP0523216B1 - Dispositif de formage hydrostatique de corps creux en metal deformable a froid - Google Patents

Dispositif de formage hydrostatique de corps creux en metal deformable a froid Download PDF

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Publication number
EP0523216B1
EP0523216B1 EP92903604A EP92903604A EP0523216B1 EP 0523216 B1 EP0523216 B1 EP 0523216B1 EP 92903604 A EP92903604 A EP 92903604A EP 92903604 A EP92903604 A EP 92903604A EP 0523216 B1 EP0523216 B1 EP 0523216B1
Authority
EP
European Patent Office
Prior art keywords
die
hollow body
workpiece
sleeve
feed
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
EP92903604A
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German (de)
English (en)
Other versions
EP0523216A1 (fr
Inventor
Wilhelm Kaiser
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.)
hde Metallwerk GmbH
Original Assignee
hde Metallwerk GmbH
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 hde Metallwerk GmbH filed Critical hde Metallwerk GmbH
Publication of EP0523216A1 publication Critical patent/EP0523216A1/fr
Application granted granted Critical
Publication of EP0523216B1 publication Critical patent/EP0523216B1/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 the hydrostatic shaping of hollow bodies made of cold-formable metal within a mold cavity of a die, with a feed for the pressure fluid into the hollow body in the form of a pressure fluid that can be moved back and forth relative to the hollow body received in the die, and lockable in the feed position leading feed sleeve, which can be pushed with an insertion opening ahead onto a cylindrical support or connection area of the hollow body located outside the mold cavity of the die and which encompasses the support or connection area in the feed position by means of a seal which is automatically sealed by liquid pressure, and wherein the feed opening of the feed sleeve is approximately funnel-shaped and is provided with an axially outwardly opening, approximately frustoconical inner surface, to which there is an essentially circular cylindrical interior mantle surface connects.
  • hollow parts produced in this way is, on the one hand, that - e.g. In the case of permanent mold casting - undercut internal cavities can be created, which can either not be machined or only be manufactured with complicated tools (e.g. by spark erosion).
  • the known hollow parts - in contrast to the hollow parts produced by machining - are relatively light and, as a result of the strain hardening associated with the deformation, with a favorable fiber orientation, which is similar to that of a forged fiber, are very resistant.
  • the known hydroforming is always limited to parts in which the force-acting lines for introducing the axial forces, that is to say the ram and the longitudinal central axis of the tube, exactly coincide.
  • the longitudinal axis of the protuberance which is sectorally produced to match the die engraving, runs transversely to the force line of the press ram and the tube (see "Industrial Indicator", loc. Cit., P. 17, fig. 4 and 8).
  • EP-A-0 347 369 it is already known to accommodate the two-sided support or connection areas of the tubular hollow body to be deformed in feed sleeves.
  • the known feed sleeves have toroidal, tubular, hollow, self-sealing seals which encompass the two support or connection areas of the hollow body.
  • the known tubular seals are pressurized with a pressure medium pressure which is substantially higher than the forming pressure of the pressure medium acting on the interior of the hollow body.
  • the support or connection areas on the hollow body side are held immovably as in a pair of pliers during the forming phase according to EP 0 347 369 A2.
  • the object of the invention is to design the known device in such a way that not only a faster method of operation, in particular one Workpieces can be changed quickly, but also a long service life of the tool, especially since it is possible with materials that are difficult to form, such as stainless steel.
  • this object is achieved in that the feed sleeve can be driven back and forth, the seal of which forms a grooved collar made of largely incompressible material, which receives the support or connection area relatively displaceably to it, and that at least the circular cylindrical inner surface, optionally also the frustoconical Inner surface, the insertion opening are provided with a granular hard metal layer.
  • the device according to the invention allows a high working frequency. This is because only the hollow body to be formed needs to be inserted into the die, which can be done automatically, for example, using a loading robot, whereupon the respective feed sleeve is moved translationally in the direction of the die and is thereby pushed onto the cylindrical support or connection area of the hollow body. As soon as the hydraulic fluid guided by the feed sleeve is pressurized, the grooved ring seal fits snugly against the outer surface of the support or connection area on the hollow body side and tensions itself under the action of the same pressure medium pressure, which also causes the hollow body to be deformed.
  • the grooved collar is relieved, whereupon the feed sleeve, the deformed hollow body and the handling area on the die can be retracted so that it can be operated.
  • a self-sealing sleeve seal has been found to be a grooved ring sleeve made of largely incompressible material.
  • each support or connection area on the hollow body side is accommodated relatively displaceably in the axial direction by the feed sleeve, only the internal pressure acting through the pressure fluid inside the hollow body to be formed can nestle the hollow body wall against the engraving of the die and in this case material from the support body or connection area on the hollow body side received material "drag" into the mold cavity.
  • At least the circular cylindrical inner surface of the insertion opening is provided with a granular hard metal layer.
  • the sleeve seal consists of an elastomeric cast polyurethane resin with a hardness of more than 90 Shore-A, preferably a hardness of 93-95 Shore-A.
  • the insertion opening is part of a union nut spanning a sleeve body, the grooved ring collar is held between the union nut and the sleeve body.
  • the granular hard metal layer is a spark erosion coating with tungsten carbide particles with a hardness of approximately 80 to approximately 82 HRc.
  • the feed sleeve is hydraulically and / or pneumatically driven in translation. This is expediently done in that the feed sleeve arranged coaxially to the circular cylindrical support or connection area of the hollow body is held coaxially at the free piston rod end of a pneumatically and / or hydraulically driven piston-cylinder unit.
  • the device for hydrostatic shaping of hollow bodies which is partially shown in FIG. 1, is designated overall by reference number 10.
  • a die 12 which consists of an upper die 13 and a lower die 14, is fastened on a press table 11.
  • Upper die 13 and lower die 14 form an upper mold cavity 15 and a lower mold cavity 16, which together add up to a common mold cavity 17.
  • the engraving 18 of the mold cavity 17 determines the surface contour of a tubular hollow body 19 as soon as it is hydrostatically deformed within the mold cavity 17 by expansion.
  • the interior of the hollow body 19 is designated 20.
  • the upper die 13 can be moved in accordance with the movement arrow denoted by y be moved up and down.
  • the upper die 13 is releasably attached to a press upper part, not shown.
  • the cross section of the supporting or connecting area 22 is approximately circular.
  • An infeed sleeve 23 is arranged coaxially at the end of a piston rod end 24, shown in broken lines, of a hydraulically driven piston-cylinder unit.
  • the entire feed sleeve 23 is essentially rotationally symmetrical, as is the piston rod end 24.
  • the feed sleeve 23 has a sleeve body 25, the extension 26 pointing to the right has an external thread 27 which is screwed into a corresponding internal thread of the piston rod end 24 in a liquid-tight and pressure-tight manner.
  • the feed sleeve 23 has an inner channel 28 which is open at both ends and runs coaxially to it for the transmission of hydraulic pressure fluid (for example an emulsion suitable for hydraulic purposes).
  • An angular channel 29 provided inside the piston rod end 24 opens into the channel 28.
  • a tubular high-pressure line 31 connects to the connection 30 of the channel 29 on the piston rod side. which leads to a high pressure generator (not shown) for the hydraulic fluid.
  • a union nut 32 is screwed onto an external thread of the socket body 25 at 33.
  • the radial inner surface 34 of the union nut 32 and the front end region of the channel 28 of the sleeve body 25 form an annular inner groove 35, in which a sleeve seal, namely a groove ring sleeve 36, is received in a form-fitting manner.
  • the grooved collar 36 has an annular base body 37, to which two sealing lips 38, 39 are integrally connected, which form an annular groove 40 between them, which backwards, i.e. towards the liquid connection 30, is open.
  • the radially extending disk-shaped wall 41 of the union nut 32 forms an insertion opening 42 which is composed of a frustoconical inner surface 43 and an adjoining circular cylindrical inner surface 44.
  • the surfaces 43 and 44 are each provided with a granular hard metal layer 49 and 48, which consists of tungsten carbide particles and has a hardness of approximately 82 HRc.
  • the tungsten carbide particles are applied by electrical discharge and intimately connected to the union nut 32 made of hardened steel.
  • the feed sleeve 23 with the piston rod end 24 is translationally movable back and forth along the movement double arrow denoted by x.
  • the feed sleeve 23 is shifted to the left along x and first reaches the intermediate position shown in broken lines, according to which the front end of the tubular hollow body 19, which is open at 45, is passed over.
  • the feed sleeve 23 is further shifted to the left along x until the union nut 32 fits snugly in the receiving opening 46 on the die side.
  • Piston rod ends 24 with feed sleeve 23 are then locked in this feed position, not shown, against displacement along the direction x. This is done in a simple manner in that the hydraulic working pressure in the hydraulic cylinder, of which only the piston rod end 24 is shown, remains.
  • hydraulic fluid is introduced into the interior 20 of the tubular hollow body 19 via the line path 31, 30, 28.
  • the hydrostatic internal pressure builds up via a filling pressure of approximately 65-80 bar to a forming pressure of up to approximately 1500 bar, at which the hydrostatic forming is to be ended in the present application.
  • This clawing locking prevents the material of the grooved collar 36 from migrating or creeping along the outer lateral surface A of the tubular hollow body 19.
  • a tendency to creep would occur without the aforementioned measure at pressures above 800-1000 bar.
  • Such pressures which can easily reach 3000 bar and more, are particularly necessary when forming stainless steels.
  • the frustoconical inner surface 43 serves for self-centering of the holding area 22 within the insertion opening 42.
  • the hard metal layer 49 on the frustoconical inner surface 43 therefore counteracts wear on the union nut 32.
  • the grooved collar 36 consists of an elastomeric cast polyurethane resin sold under the trademark " Vulkollan " by Bayer AG, DE-5090 Leverkusen, with a hardness of 93 Shore-A.
  • hydraulic fluid can be fed at both ends into a hollow body 19 to be formed, via identical feed sleeves 23.
  • a blind sleeve 23 is used, which has no pressure medium feed, since the channel 28 has an end at 47 at the end.
  • Channel 28 is used in the blind sleeve 23 and in the feed sleeve 23 for the essentially axial force-free sliding seat receptacle of the support or connection area 22 on the hollow body side.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)
  • Metal Extraction Processes (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Claims (7)

  1. Dispositif (10) de formage hydrostatique de corps creux (19) en métal déformable à froid à l'intérieur d'une cavité de formage (17) d'une matrice (12), avec une alimentation pour le liquide sous pression dans le corps creux (19), sous la forme d'un manchon d'alimentation (23) pouvant être déplacé dans un sens par rapport au corps creux (19) logé dans la matrice (12), pouvant être bloqué dans la position d'alimentation, guidant le liquide sous pression et pouvant être enfilé par une ouverture d'introduction (42) au préalable sur une zone d'appui ou de raccordement cylindrique du corps creux, se trouvant à l'extérieur de la cavité de formage (17) de la matrice (12), et entourant la zone d'appui ou de raccordement (22), dans la position d'alimentation, au moyen d'un joint d'étanchéité (36) assurant automatiquement une étanchéité au moyen de la pression du liquide et l'ouverture d'introduction (42) du manchon d'alimentation (23) étant réalisée à peu près à la forme d'un entonnoir et étant pourvue alors d'une surface d'enveloppe intérieure (43) à peu près tronconique allant en s'ouvrant axialement en direction de l'extérieur, surface à laquelle se raccorde une surface d'enveloppe intérieure (44) sensiblement cylindrique circulaire,
    caractérisé en ce que le manchon d'alimentation (23) peut être entraîné de façon à se déplacer dans un sens et dans l'autre, son joint d'étanchéité constituant une manchette à gorge et anneau (36), en un matériau le plus largement possible incompressible, qui loge la zone d'appui ou de raccordement (22) d'une façon permettant un déplacement relatif par rapport à lui, et en ce qu'au moins la surface d'enveloppe intérieure (44) cylindrique circulaire, le cas échéant en plus la surface d'enveloppe intérieure tronconique (43), de l'ouverture d'introduction (42) sont pourvues d'une couche en métal dur (48, 49) granuleuse.
  2. Dispositif selon la revendication 1,
    caractérisé en ce que la manchette annulaire annexe (36) est constituée d'une résine moulée à base de polyuréthane, élastomère.
  3. Dispositif selon la revendication 2,
    caractérisé en ce que la dureté de la résine moulée polyuréthane, élastomère est supérieure à 90 Shore-A, et est par exemple de 93 à 95 Shore-A.
  4. Dispositif selon l'une des revendications 1 à 3,
    caractérisé en ce que l'ouverture d'introduction (42) est une partie d'un écrou d'accouplement (32) saisissant par le dessus un corps de manchon (25), la manchette annulaire à gorge (36) étant maintenue entre l'écrou d'accouplement (32) et le corps de manchon (25).
  5. Dispositif selon l'une des revendications 1 à 4,
    caractérisé en ce que la couche en métal dur (48, 49) présente un recouvrement appliqué par électro-érosion avec des particules en carbure de tungstène d'une dureté allant d'à peu près 80 à à peu près 82 HRc.
  6. Dispositif selon l'une des revendications 1 à 5,
    caractérisé en ce que le manchon d'alimentation (23) est entraîné par translation hydrauliquement et/ou pneumatiquement.
  7. Dispositif selon la revendication 6,
    caractérisé en ce que le manchon d'alimentation (23) disposé coaxialement par rapport à la zone d'appui ou de raccordement (22) cylindrique circulaire du corps creux (19) est maintenu coaxialement sur l'extrémité de la tige de piston (24) d'une unité à cylindre-piston entraînée pneumatiquement et/ou hydrauliquement.
EP92903604A 1991-02-01 1992-01-31 Dispositif de formage hydrostatique de corps creux en metal deformable a froid Expired - Lifetime EP0523216B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4103079 1991-02-01
DE4103079A DE4103079A1 (de) 1991-02-01 1991-02-01 Vorrichtung zum hydrostatischen umformen von hohlkoerpern aus kaltumformbarem metall
PCT/DE1992/000063 WO1992013655A1 (fr) 1991-02-01 1992-01-31 Dispositif de formage hydrostatique de corps creux en metal deformable a froid

Publications (2)

Publication Number Publication Date
EP0523216A1 EP0523216A1 (fr) 1993-01-20
EP0523216B1 true EP0523216B1 (fr) 1995-07-26

Family

ID=6424200

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92903604A Expired - Lifetime EP0523216B1 (fr) 1991-02-01 1992-01-31 Dispositif de formage hydrostatique de corps creux en metal deformable a froid

Country Status (10)

Country Link
US (1) US5279142A (fr)
EP (1) EP0523216B1 (fr)
JP (1) JP2546768B2 (fr)
AT (1) ATE125475T1 (fr)
BR (1) BR9204113A (fr)
DE (2) DE4103079A1 (fr)
DK (1) DK0523216T3 (fr)
ES (1) ES2076750T3 (fr)
GR (1) GR3017157T3 (fr)
WO (1) WO1992013655A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5353618A (en) 1989-08-24 1994-10-11 Armco Steel Company, L.P. Apparatus and method for forming a tubular frame member
US5992197A (en) * 1997-03-28 1999-11-30 The Budd Company Forming technique using discrete heating zones
US6006567A (en) * 1997-05-15 1999-12-28 Aquaform Inc Apparatus and method for hydroforming
US6502822B1 (en) 1997-05-15 2003-01-07 Aquaform, Inc. Apparatus and method for creating a seal on an inner wall of a tube for hydroforming
US6434990B1 (en) * 1999-01-08 2002-08-20 Formrite Companies, Inc. Hose fitting and die for preparation
US6006568A (en) * 1998-03-20 1999-12-28 The Budd Company Multi-piece hydroforming tool
US6098437A (en) * 1998-03-20 2000-08-08 The Budd Company Hydroformed control arm
US6209372B1 (en) 1999-09-20 2001-04-03 The Budd Company Internal hydroformed reinforcements
DE10045641B4 (de) * 2000-09-15 2005-04-21 Audi Ag Hydromechanische Umformvorrichtung
WO2005046976A1 (fr) * 2003-11-12 2005-05-26 Bridgest0Ne Corporation Procede de production d'un corps de support de pneu a flancs renforces, corps de support de pneu a flancs renforces et pneu a flancs renforces
DE102013109880B4 (de) 2012-09-10 2016-11-03 National Research Council Of Canada Reibungsarmer Endennachschub beim Innenhochdruckumformen
CN111712334B (zh) * 2018-02-23 2023-01-10 住友重机械工业株式会社 成型装置

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2780273A (en) * 1956-01-30 1957-02-05 Fred T Roberts Method and apparatus for making a molded flexible hose
US2938562A (en) * 1957-12-24 1960-05-31 Gray Tool Co Structure for lining tubular members
DE1855909U (de) * 1962-02-15 1962-08-02 Leitz Ernst Gmbh Vorrichtung zur sicherung des schrittweisen transports von gefachmagazinen.
DE1885909U (de) * 1963-08-26 1964-01-16 American Radiator & Standard Vorrichtung zum verformen eines hohlkoerpers.
US3625040A (en) * 1969-08-06 1971-12-07 Koppy Tool Corp Method and apparatus for forming articles from a tubular blank
US3704983A (en) * 1970-12-04 1972-12-05 Establissements Butin Gillet Method of and apparatus for the formation of tubular articles
DE2118207C3 (de) * 1971-04-15 1979-01-25 Tokyu Sharyo Seizo K.K., Yokohama, Kanagawa (Japan) Preßform mit mehreren, gleitbeweglich in einem Gehäuse angeordneten Matrizen
JPS5314156A (en) * 1976-07-26 1978-02-08 Aizawa Tetsukoushiyo Kk Device for processing bulge
JPS5584231A (en) * 1978-12-20 1980-06-25 Toshiba Corp Hydrostatic bulge forming method
DE3105735C2 (de) * 1981-02-17 1983-05-26 Wilfried 4630 Bochum Busse Anlage zur druckdichten Befestigung eines Rohres in einem Rohrboden mit Hilfe einer Druckflüssigkeit
US4467630A (en) * 1981-12-17 1984-08-28 Haskel, Incorporated Hydraulic swaging seal construction
US4827747A (en) * 1986-05-21 1989-05-09 Hitachi, Ltd. Method for producing a bellows with oval cross section and apparatus for carrying out the method
US4751836A (en) * 1986-07-07 1988-06-21 Vetco Gray Inc. Pipe end conditioner and method
DE3820952A1 (de) * 1988-06-16 1989-12-21 Mannesmann Ag Verfahren und vorrichtung zum hydraulischen aufweiten von hohlprofilen
JPH0280127A (ja) * 1988-09-19 1990-03-20 Hitachi Ltd 楕円ベローズの製造方法

Also Published As

Publication number Publication date
JP2546768B2 (ja) 1996-10-23
ATE125475T1 (de) 1995-08-15
JPH05504726A (ja) 1993-07-22
BR9204113A (pt) 1993-06-08
EP0523216A1 (fr) 1993-01-20
WO1992013655A1 (fr) 1992-08-20
DE4103079A1 (de) 1992-08-27
US5279142A (en) 1994-01-18
ES2076750T3 (es) 1995-11-01
DK0523216T3 (da) 1995-09-11
DE59203018D1 (de) 1995-08-31
DE4103079C2 (fr) 1993-01-07
GR3017157T3 (en) 1995-11-30

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