EP1609545A2 - Méthode et dispositif pur le formage à haute pression interne d'un profilé creux - Google Patents

Méthode et dispositif pur le formage à haute pression interne d'un profilé creux Download PDF

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Publication number
EP1609545A2
EP1609545A2 EP05013694A EP05013694A EP1609545A2 EP 1609545 A2 EP1609545 A2 EP 1609545A2 EP 05013694 A EP05013694 A EP 05013694A EP 05013694 A EP05013694 A EP 05013694A EP 1609545 A2 EP1609545 A2 EP 1609545A2
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EP
European Patent Office
Prior art keywords
expansion body
hollow profile
hollow
pressure
expansion
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.)
Withdrawn
Application number
EP05013694A
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German (de)
English (en)
Other versions
EP1609545A3 (fr
Inventor
Alois Haiderer
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.)
Sebring Technology GmbH
Original Assignee
Sebring Technology 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 Sebring Technology GmbH filed Critical Sebring Technology GmbH
Publication of EP1609545A2 publication Critical patent/EP1609545A2/fr
Publication of EP1609545A3 publication Critical patent/EP1609545A3/fr
Withdrawn legal-status Critical Current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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/10—Stamping using yieldable or resilient pads
    • B21D22/12—Stamping using yieldable or resilient pads using enclosed flexible chambers
    • B21D22/125—Stamping using yieldable or resilient pads using enclosed flexible chambers of tubular products
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/02—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of a flexible element, e.g. diaphragm, urged by fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B7/00—Presses characterised by a particular arrangement of the pressing members
    • B30B7/04—Presses characterised by a particular arrangement of the pressing members wherein pressing is effected in different directions simultaneously or in turn

Definitions

  • the invention relates to a method and a device for hydroforming a hollow profile.
  • Hydroforming (see, for example, EP 0 906 800 B1) is known as a relative young forming process, which hollow, thin-walled components by means of a hydraulic internal pressure in a swaging form, wherein a linear, axial tool movement is superimposed.
  • the procedure was mainly due the progressive trend towards lightweight construction and usually works from a tubular, deflected semi-finished product. For inserting a blank and for the removal of the deformed workpieces must the tools in principle be shared.
  • the manufacturing process runs in the following Steps: first, the tubular blank is in the open tool placed and flooded with hydraulic fluid; then the tool becomes closed and the faces of the workpiece are sealed; after all follows the actual forming process, in which the workpiece from high inside Pressure is applied, whereby it deforms to the outside. After the first free expansion, it lays gradually to the inner contour of the tool at. Usually, because of the increased scope and thus enlarged Surface material axially pushed over a tool movement.
  • a disadvantage of known Hoch horrumform compiler is firstly that the used hydraulic fluid comes into contact with the workpiece, which is why on the one hand, the workpiece must then be cleaned, on the other by the Workpiece contaminated hydraulic fluid must be disposed of.
  • Another disadvantage of these known Hydroforming is that upon penetration of the workpiece, in particular in a crack in a wall, hydraulic pressure medium of one Interior of the workpiece disturbed in a gap between Maschinenstüc becomes.
  • DE 195 33 828 C2 describes an apparatus and a method for hydroforming, in which an elastic hollow body on a stamp in the interior of the blank is pushed.
  • DE 197 24 036 A1 describes a method for hydroforming, in an elongated body having inside a substantially rigid lance, is introduced into the blank. Again, these are mechanical actuators required to introduce the expansion body into the interior of the blank.
  • the inventive method for hydroforming a hollow profile comprises the following method steps: the hollow profile is in a hollow mold trained cavity introduced; an expansion body will at least partially expanded into an interior of the hollow profile in such a way that the expansion body essentially of itself an inner contour of the hollow profile adapt; the hollow profile is reshaped by expansion of the expansion body; and the expansion body is at least partially out of the interior the hollow profile withdrawn by contracting the expansion body becomes.
  • the hollow mold is advantageously formed from a plurality of moldings, to remove the workpiece, in particular the deformed hollow profile, to enable.
  • the cavity of the mold is advantageously only at one Place open for supplying a pressure medium and enclosing the hollow profile otherwise complete.
  • the mold additionally advantageously has a separate venting channel to air displaced by the expansion body drain off or drain any liquid in the cavity.
  • the introduction the hollow profile can be done by simply inserting. It is possible also to preform the workpiece during insertion, in particular to squeeze or squeeze.
  • the expansion body is at least partially during its expansion in inserted the interior of the hollow profile.
  • This is advantageously done by a special structure of the expansion body causes, when exposed of the expansion body with a pressure medium automatically an extension causes the expansion body in the interior. Is it for example around an elongated hollow profile, the expansion body expands predominantly in length during its expansion into the interior.
  • the structure is advantageously achieved by a drape of a skin of the expansion body, in particular according to a concertina or Faltenbalgtexs formed.
  • the structure serves to give the expansion body its own advantage the interior of the hollow profile adapted anisotropic expansion behavior to rent.
  • the expansion body expands so that it itself Interior of the hollow profile adapts without on an inner surface or inner contour to adapt to the hollow profile. This is on the one hand an excessive stress the expansion body avoided during its expansion, on the other also allows faster process control, since the expansion body automatically inserted by itself and not with the help of complicated movement means must be inserted into the interior of the hollow profile.
  • the expansion body is advantageously both expanded by means of the pressure generator and contracted: the pressure generator thus has two a double function. Due to the inherent adaptability function of the Expansion body becomes a frictional contact of the expansion body with the inner contour reduces the hollow profile, causing the expansion body from wear is more protected. In addition, an excessive expansion avoided and reduces the risk of cracking of the expansion body.
  • the hollow profile is advantageously by a shock of the flowing pressure medium transformed abruptly.
  • the impact is for example due to the kinetic Energy or the pressure surge of the incoming pressure medium causes.
  • the Hollow profile can be multi-shell, open, semi-open, as half or quarter shell with or designed without breakthroughs.
  • the expansion body After forming, the expansion body is at least partially out of the Interior withdrawn, for example, with the help of one in its interior contracting negative pressure is contracted.
  • the contraction of the Expansion body will advantageously turn with the above Structure accomplished by the pressure medium inside the expansion body is sucked from the expansion body, causing the expansion body accordingly its structure collapses and / or curls up. With the help of this The process enables simple, clean and safe process management. A formation of compressed air bubbles in the interior of the hollow profile is avoided because the expansion body without further difficulty completely i.e. free of air bubbles can be filled with a pressure medium.
  • the expansion body is advantageously made of an elastomer, in particular made of a rubber, advantageously tissue-free.
  • the structure of the expansion body For example, by the shape of a concertina or be given a bellows. Also, screwed forms, such as a twisted accordion, in the sense of a stocking on the left dragged. in relation on the interior inverted or in cross-section meandering structures possible to include in or withdraw a simple at least partial insertion to allow from the interior of the hollow profile.
  • the expansion body by applying a extended incompressible pressure medium.
  • a extended incompressible pressure medium for this example, oils or viscous media, e.g. Fats, to be used.
  • the print medium is not in contact with the hollow profile, is a cleaning of the deformed Hollow profiles of the print medium not required.
  • that can Re-used media and must not be disposed of after use become.
  • the hollow profile inserted or inserted at least one further hollow profile.
  • the method allows multiple hollow profiles simultaneously or in time deform one after another and thus produce multilayer structures. Therefore for example, several hollow profiles may be placed inside each other or side by side, i. completely or only partially overlapping, are arranged and by forming each other get connected. In addition, chemical-technical compounds can be achieved become.
  • complex structures can be easily used made of various materials in a timely manner. For example, two or more hollow sections become simultaneously with an expansion of the expansion body transformed. It is also possible that a hollow profile after deformation of the other hollow profile by a further expansion of the expansion body reshape. In the last method variant, a workpiece built up in layers.
  • elements of metal, plastic, sintered materials or ceramic, in particular half-shell parts, pipe flanges, pipe branches connected by forming with the hollow profile hereby can target complex workpieces using a variety of materials be connected to each other at different points of the hollow profile.
  • connections between metals and ceramics or metals and plastics through which the beneficial properties of ceramics or plastics, in particular their electrical and thermal Insulation properties, with the advantageous properties of metals, in particular whose mechanical properties can be combined with each other. This can be particularly adapted for the particular application Workpieces are produced.
  • the hollow profile is heated prior to forming.
  • a heating the hollow section before forming allows hollow sections with large Reshap wall thicknesses, which on the one hand prevents tearing of the wall On the other hand, particularly robust workpieces can be produced can.
  • the expansion body by a cooled pressure medium further protected against overheating.
  • the hollow profile before insertion into the cavity of Mold preformed as e.g. pre-bent or with a structure (e.g., knobs) Mistake.
  • a structure e.g., knobs
  • the hollow profile deformed compression-free and / or wrinkle-free becomes.
  • the adverse properties of wrinkles for further use of the workpiece avoided.
  • the expansion body is first with a pressure medium prefilled and then the expansion body with one or more Pressure surges inflated to its full size, while the workpiece deformed.
  • the for the high pressure required pressure generators smaller and space-saving be configured by the prefilling accomplished by means of a pump that is the pressure medium from a simple tank with a valve in the Expansion body pumps.
  • a heat protection layer in particular a wax or Teflon layer
  • This heat protection layer causes the expansion body for the brief moment of his contact with the hollow profile is not damaged during the forming process.
  • True will be by the at least partial retraction of the expansion body from the interior the hollow profile, the time of contact between the expansion body and the hollow profile comparatively short, but helps such a heat protection layer In addition thereby that the flexible expansion body before a to preserve harmful heat.
  • the hollow mold on its inner surface with a sliding layer, especially a wax, oil, grease or Teflon layer to coat.
  • the sliding layer serves to slide the material of the hollow profile along the Inner surface of the mold to facilitate. This will break a wall the hollow profile counteracted.
  • the mold advantageously has two or more moldings, the mechanical be closed with each other. Unlike solutions where the mold parts of the mold held together by means of hydraulic cylinders An advantage of the mechanical shutter is that it very simple, cheap and safe works.
  • the expansion body becomes for a plurality of expansion processes and / or used for a plurality of hollow profiles.
  • a second pressure medium in the Interior supplied via a pressure line.
  • Coating variant is comparatively little coating agent, which serves as a further pressure medium, because a large part of the interior of the hollow section is filled by the volume of the expansion body.
  • the second Pressure medium can also be used as a coolant for the expansion body when using preheated hollow sections are used.
  • coatings are in particular acid resistant coatings such as e.g. Resins (such as epoxy resin), ceramics or sintered materials particularly useful.
  • At least one further expansion body is at least partially in the interior of the hollow profile in such a way that it is substantially adapts itself to the inner contour of the hollow profile.
  • several expansion bodies can workpieces with separate cavities through Forming be made.
  • the Use of several expansion bodies also with expansion bodies is appropriate, not the suitability of a self-adaptation to the inner contour possess the hollow profile.
  • the inventive device for forming a hollow profile comprises a hollow mold, which forms a cavity into which a hollow profile can be inserted, an expansion body, which is insertable in an interior of the hollow profile, and a pressure generator in fluid communication with the expansion body stands, wherein the expansion body has a structure through which The expansion body is essentially self-contained during its expansion extend at least partially into the interior of the hollow profile and during essentially by itself at least partially can withdraw from the interior of the hollow profile out.
  • this device With the help of this device, a variety of arbitrarily shaped workpieces be reshaped simultaneously and in rapid succession.
  • the structure causes that the expansion body in a defined manner certain spatial directions stronger than in other spatial directions. It serves to make the expansion body automatically inserts itself into the interior of the hollow profile and automatically retracts after completion of the forming process.
  • a supporting of the expansion body against an inner contour of the hollow profile essentially not required, which on the one hand the mechanical stress of the expansion body is reduced, on the other hand due to the automatic Retraction behavior faster process control is enabled.
  • a pressure generator for generating an overpressure in particular between 80 and 16000 bar, preferably between 150 and 1500 bar, more preferably between 300 and 500 bar, depending on the form used and used material.
  • a negative pressure generated by the pressure medium from the expansion body can be withdrawn.
  • the pressure generator is advantageously an overpressure and a negative pressure can be generated.
  • the hollow mold expediently has at least two molded parts which are mechanically can be closed with each other. Through a mechanical closure will easily secure connection of the moldings used Mold guaranteed.
  • the device further comprises a device for preforming the hollow profile. This is especially at strong deformations or transformations of the hollow profile useful to multi-stage Hydroforming process to avoid.
  • the device advantageously comprises a heater for heating the hollow profile before its transformation. Due to the high temperatures of the hollow section, a material flow during the forming process facilitates, which a processing of thicker wall thicknesses constant working pressure of the pressure medium allows.
  • the device has in a special embodiment with a pressure generator a pressure transducer for incompressible fluids, especially oil or Fat, up.
  • a pressure transducer for incompressible fluids, especially oil or Fat, up.
  • the pressure transducer can easily very high Pressures, in particular between 80 and 16000 bar, preferably between 150 and 1500 bar, more preferably between 300 and 500 bar, depending on the used Form and used material are generated.
  • the Expansion body designed on its outer surface with a heat protection layer.
  • the flexible expansion body for example made of an elastomer is shaped.
  • the mold is on its inner surface covered with a sliding layer.
  • the sliding layer includes advantageously wax, oil, fat and / or Teflonzu algorithms.
  • the device further comprises a check valve in the fluid-conducting connection. This will ensure that the shortly after the Forming process going back not the pressure lines for the pressure medium destroyed.
  • the device has a further pressure line for applying the interior outside of the expansion body, in particular for releasing the expansion body by a back pressure and / or for coating the hollow profile from inside, on. With a back pressure can a removed with the workpiece bound expansion body.
  • the second Printing medium can also be used to mechanical, the workpiece from the inside and / or chemically coating; with the help of high pressure a particularly durable coating can be produced. With the second pressure line can also conventional hydroforming with the device described be performed.
  • the expansion body with a sealing function for the Equip pressure line.
  • valves are unnecessary, for the second pressure line would be required: the expansion body seals at his Expansion from the mouth of the second pressure line.
  • expansion body with the Structure it may be useful in principle at least one other expansion body to provide, which is insertable into the interior of the hollow profile. As a result, even workpieces can be edited, the complicated undercuts or have separate interiors.
  • Fig. 1 shows the device according to the invention in cross section with a hollow profile 1, which is introduced into a cavity 3 of a hollow mold 2, and in whose interior 5 an expansion body 4 extends.
  • the expansion body 4 is by means of a fluid-conducting connection 11 and a pressure generator 10th filled with a pressure medium, especially oil, so that it is in the interior 5 of the hollow profile 1 extends substantially by itself. His stretching motion Essentially, he does it himself and does not need one by an inner contour 18 of the hollow profile 1 applied counterforce or counter pressure.
  • the expansion body 4 fills the interior with complete pre-filling 5 of the hollow profile 1 from.
  • the hollow section 1 by pressing the pressure generator 10, which is designed here as a pressure transducer, to a Inner surface 8 of the mold 2 pressed.
  • a piston 15 of the pressure generator 10 can be built both an overpressure of about 350 bar and a Vacuum are generated, by means of which the expansion body 4 is substantially by itself from the interior 5 of the then transformed hollow profile. 1 withdraws.
  • a connection head 16 of the pressure generator 10 is positively with the mold 2 connected to produce a fluid-conducting connection 11.
  • By appropriate shaping of the mold 2 can arbitrarily shaped Hollow profiles or other sub-profiles such. Half shell profiles that are straight or curved, can be reshaped.
  • Fig. 2a shows an expansion body 4 in cross-section in a relaxed state.
  • the outer surface 7 of the expansion body 4 is coated with a heat-resistant layer, too Can edit hollow sections 1, which improve the material flowability are heated to high temperatures.
  • This allows editing of Hollow profiles 1 with comparatively large wall thicknesses.
  • Through a structure 12 of the expansion body 4 is an expansion of the expansion body 4 in his Longitudinal allows, so that at least partially inserting or retracting of the expansion body 4 in and out of the interior 5 of the hollow profile 1 is made possible by the expansion body a corresponding Over- or under pressure is exposed. A refitting of the device with a new unprocessed workpiece is thus facilitated.
  • Fig. 2b shows the expansion body 4 of Fig. 2a in a pre-filled state.
  • the structure 12 is substantially due to the expansion of the expansion body 4 disappeared.
  • the pressure generator 10 By specifying a pressure surge with the pressure generator 10, the hollow profile 1 is pressed against the inner surface 8 of the hollow mold 2 and transformed accordingly.
  • Fig. 3 shows an arrangement of the device according to the invention on a workbench.
  • FIG. 4 shows a section of the device according to the invention according to FIG. 1, wherein a hollow profile 1 and an additional element 6 in the cavity 3 of two mold parts 9, 9 'composite mold 2 is introduced.
  • the expansion body 4 By admission of the expansion body 4 with a pressure expands the expansion body 4 in the interior 5 of the hollow section 1 and pushes the hollow profile. 1 and the element 6 at a correspondingly high pressure of about 350 bar against the Inner surface 8 of the mold 2.
  • the mold 2 is shown by means of the one shown in FIG Connection head 6 sealed.
  • a hollow profile 1 with a plurality of elements, e.g. Half-shell parts, pipe flanges, Connections, pipe branches, etc., to connect.
  • FIG. 5 shows a detailed view of a device according to the invention for hydroforming with an expansion body 4, which meanders in cross section is structured.
  • an expansion body 4 By actuating the piston 15 of the pressure generator 10th is the expansion body 4 via the fluid-conducting connection 11 with oil as Pressure medium applied, causing it due to the meandering structure 12 performs a stretching movement in the interior 5 of the hollow section 1.
  • the Structure serves to the expansion body 4 has its own anisotropic expansion behavior to rent.
  • the expansion body 4 expands so that he adjusts itself to the interior 5 of the hollow section 1.
  • the adaptation of the Expansion body 4 to the interior 5 of the hollow section 1 is thus advantageously essentially without support of the expansion body 4 at one Inner contour 18 of the hollow profile 1.
  • an excessive Stress of the expansion body 4 is avoided during its expansion as well allows faster process control, since the expansion body 4 automatically inserted by itself and not with the help of complicated movement means (not shown) are inserted into the interior 5 of the hollow section 1 got to.
  • a vent line 20 the of the expansion body 4 in the Cavity 3 of the mold 2 escape compressed air.
  • an additional Pressure line 19 may be a second pressure medium, in particular with additives, which serve a coating of the hollow section 1 from the inside, in the interior 5 are supplied outside of the expansion body 4.
  • Via a ventilation line 20 air can escape from the cavity 3 and / or the interior 5.
  • the expansion body 4 is equipped in such a way that it expands the additional pressure line 19 seals. Another sealing effect is achieved by the expanding during the hollow profile.
  • Fig. 6 shows the device according to the invention according to Fig. 5, in which the hollow mold 2 has been disconnected from the pressure generator 10.
  • Fig. 6 shows the device according to the invention according to Fig. 5, in which the hollow mold 2 has been disconnected from the pressure generator 10.
  • Fig. 6 shows the device according to the invention according to Fig. 5, in which the hollow mold 2 has been disconnected from the pressure generator 10.
  • Fig. 6 shows the device according to the invention according to Fig. 5, in which the hollow mold 2 has been disconnected from the pressure generator 10.
  • hollow sections 1 can be formed.
  • the invention relates to a method for hydroforming a hollow profile and comprises the following method steps: insertion of the hollow profile 1 in one in a mold 2 formed cavity 3; at least partial expansion an expansion body 4 in an interior 5 of the hollow profile 1 in such a way that the expansion body 4 substantially by itself an inner contour 18 of the hollow profile 1 adapts; Forming the hollow section 1 by expansion of the Expansion body 4; and at least partially retracting the expansion body 4 from the interior 5 of the hollow section 1, by the expansion body. 4 and one suitable for carrying out this procedure Contraption.
  • the invention is characterized in that complex Workpieces easy, clean, safe and accurately formed in a swift manner can be.
  • the expansion body 4 contracts at a corresponding Underpressure in the pressure medium, which are generated with the pressure generator 10 can, back from the interior 5 back.

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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)
EP05013694A 2004-06-24 2005-06-24 Méthode et dispositif pur le formage à haute pression interne d'un profilé creux Withdrawn EP1609545A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004030545 2004-06-24
DE102004030545A DE102004030545B3 (de) 2004-06-24 2004-06-24 Verfahren und Vorrichtung zum Innenhochdruckformen eines Hohlprofils

Publications (2)

Publication Number Publication Date
EP1609545A2 true EP1609545A2 (fr) 2005-12-28
EP1609545A3 EP1609545A3 (fr) 2006-12-20

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EP05013694A Withdrawn EP1609545A3 (fr) 2004-06-24 2005-06-24 Méthode et dispositif pur le formage à haute pression interne d'un profilé creux

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DE (1) DE102004030545B3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013083842A1 (fr) 2011-12-09 2013-06-13 Thyssenkrupp System Engineering Gmbh Élément à corps creux et procédé de fabrication associé
CN111390004A (zh) * 2020-04-26 2020-07-10 佛山市永恒液压机械有限公司 一种液压增压装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7380429B1 (en) * 2007-02-28 2008-06-03 Gm Global Technology Operations, Inc. Tubular local expansion apparatus and method of locally expanding tubular member for vehicles

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US4183124A (en) * 1977-11-21 1980-01-15 Kisco Company Method of and apparatus for fabricating spiral wrapped cartridge cases
DE4309932A1 (de) * 1993-03-26 1994-09-29 Hermann Bartels Verfahren und Vorrichtung zum Verformen von Hohlprofil-Werkstücken
DE19533828C2 (de) * 1995-09-13 1997-11-20 Daimler Benz Ag Vorrichtung zum Innenhochdruckumformen von rohrförmigen Rohlingen
US5671629A (en) * 1996-02-15 1997-09-30 Valyi; Emery I. Hydrostatic forming device and process
DE29604723U1 (de) * 1996-03-14 1997-07-17 Bartels, Hermann A., 63165 Mühlheim Vorrichtung zum Verformen von Hohlprofil-Werkstücken
DE19724036A1 (de) * 1997-06-06 1998-12-10 Audi Ag Verfahren zum Herstellen eines hohlen, insbesondere rohrförmigen Teiles
DE19743863A1 (de) * 1997-10-04 1999-04-15 Schaefer Hydroforming Gmbh Verfahren und Vorrichtung zum Herstellen einer Hohlwelle mit äußeren radialen Erhebungen durch Innenhochdruck-Umformung
SE518722C2 (sv) * 1998-06-26 2002-11-12 Flow Holdings Gmbh Sagl Llc Anordning och förfarande för expansionsformning
DE19935714B4 (de) * 1999-07-29 2005-06-23 Audi Ag Vorrichtung und Verfahren zum Trennen oder Lochen eines Werkstückes

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013083842A1 (fr) 2011-12-09 2013-06-13 Thyssenkrupp System Engineering Gmbh Élément à corps creux et procédé de fabrication associé
DE102011056202A1 (de) 2011-12-09 2013-06-13 Thyssenkrupp System Engineering Gmbh Hohlkörperbauteil und Verfahren zu seiner Herstellung
DE102011056202B4 (de) * 2011-12-09 2017-11-09 Thyssenkrupp System Engineering Gmbh Verfahren zur Herstellung eines Hohlkörperbauteils
CN111390004A (zh) * 2020-04-26 2020-07-10 佛山市永恒液压机械有限公司 一种液压增压装置

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DE102004030545B3 (de) 2006-01-05

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