WO2008071396A1 - Procédé d'hydroformage de composants - Google Patents

Procédé d'hydroformage de composants Download PDF

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Publication number
WO2008071396A1
WO2008071396A1 PCT/EP2007/010827 EP2007010827W WO2008071396A1 WO 2008071396 A1 WO2008071396 A1 WO 2008071396A1 EP 2007010827 W EP2007010827 W EP 2007010827W WO 2008071396 A1 WO2008071396 A1 WO 2008071396A1
Authority
WO
WIPO (PCT)
Prior art keywords
ionic liquid
hydroforming
gas
pressure
liquid
Prior art date
Application number
PCT/EP2007/010827
Other languages
German (de)
English (en)
Inventor
Eberhard Schlücker
Original Assignee
Friedrich-Alexander-Universität Erlangen-Nürnberg
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 Friedrich-Alexander-Universität Erlangen-Nürnberg filed Critical Friedrich-Alexander-Universität Erlangen-Nürnberg
Priority to AT07856575T priority Critical patent/ATE487549T1/de
Priority to DE502007005635T priority patent/DE502007005635D1/de
Priority to EP07856575A priority patent/EP2107953B1/fr
Publication of WO2008071396A1 publication Critical patent/WO2008071396A1/fr

Links

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

Definitions

  • the invention relates to a method for hydroforming components according to the preamble of claim 1.
  • hydroforming is understood to mean various processes of active-substance-based transformation, ie processes in which liquid media, such as water and oil, assume the function of the force-introducing component.
  • liquid media such as water and oil
  • hydroforming includes high pressure forming, hydrostatic stretch forming, and hydromechanical deep drawing.
  • hydroforming is thus a technique in which the component to be molded is pressed against a tool by means of a liquid (also pressurized fluid).
  • a liquid also pressurized fluid
  • hydroforming is thus a technique in which the component to be molded is pressed against a tool by means of a liquid (also pressurized fluid).
  • a product with a uniform shape can be produced with a divisible tool.
  • complex forms by hydroforming.
  • An example of this is the transition from round to square or to other shapes.
  • a combination of several forms belongs in the range of possibilities. At the same time you can achieve sharper corners and higher dimensional accuracy, depending on fluid pressure, which may for example be about 2,000 to 4,000 bar but also more.
  • Hydroforming is thus an established in many industries manufacturing process for complicated shaped components, such as in the automotive industry in the production of camshafts from tube-like workpieces.
  • the workpiece is tightly clamped in a divisible tool and loaded with a pressure fluid serving as a pressure fluid until the desired shape is established by flow of the material.
  • the pressure required for these processes is usually generated by piston pumps and results from the material properties of the metal to be processed at the selected ambient conditions. Since steel sheets or steel profiles (for example, pipes) are usually used as the raw material, hydroforming of complicated components up to 4000 bar is necessary.
  • the stresses of the pressure generator and the tools at this pressure level are considerable and lead to massive cost-intensive designs and a relatively high failure or damage probability.
  • a typical printing fluid for such applications is the thermal oil Marlotherm®, which can be used up to about 300 ° C. For many applications of the future is but this temperature is still not high enough, because the material strength at this temperature is not much lower.
  • the invention is therefore based on the object to provide an improved method for hydroforming of components to avoid these disadvantages.
  • the pressure fluid is an ionic liquid is used.
  • an organic ionic liquid and / or an inorganic ionic liquid or a mixture of these two liquids is used as the ionic liquid.
  • the ionic liquids to be used according to the invention as pressurized fluid are currently usable up to at least 550.degree. This is a typical mixture of lithium nitrate, potassium nitrate, nitrite and other ingredients. But it can also higher with yet to be created ionic liquids of another kind Temperatures are reached. Another advantage of the group of ionic liquids is their chemical inertness, so that hardly any attacks on materials are to be feared. In addition, due to the extremely low vapor pressure, the odor load in the manufacturing environment is reduced and thus also ensures less pressure fluid loss through evaporation.
  • Fig. 1 shows in a table a clear comparison of the compressibility and the volume loss per 100 bar in water and some organic ionic liquids. The values listed in this table were tested at pressures up to 2000 bar and 200 ° C. simultaneity loading, whereby these organic ionic liquids were recognized to be stable.
  • the hydroforming process can also be operated by a controlled process, with temperatures above the limit temperature, e.g. 300 or 550 ° C, but under atmospheric pressure, the aforementioned limit temperature is not exceeded.
  • the limit temperature e.g. 300 or 550 ° C
  • ionic liquids to be used according to the invention are liquids which contain only ions. These are liquid salts without the salt being dissolved in a solvent such as water is.
  • ionic liquids should be understood as meaning substances which consist of cations and anions. In this case, mixtures of several cations and anions are possible.
  • the ionic liquid used as pressurized fluid can be indirectly act on the component to be formed via gas, which was first filled in the component and / or in a space in front of it.
  • it may be provided to compress the gas with the aid of a liquid piston formed from ionic liquid.
  • the ionic liquid is allowed to act on the gas via an intermediate agent arranged therebetween.
  • intermediate means either a template plate and / or a further liquid can be used, which floats on the ionic liquid.
  • a chamber or a pipe system - first with gas, possibly already with a certain pressure, and then compressed this gas by means of a liquid piston formed from ionic liquids, so is heated by the compression of the gas and thus the component.
  • the ionic liquid experiences the same temperature at the interface with the gas or a slightly lower temperature due to the heat absorption in the ionic liquid. It is important that many ionic liquids absorb little gas.
  • the advantage of this procedure is that the gas can be compressed only by the technically relatively simple pumping of the ionic liquid.
  • the machine technology required for pumping is already available, with the energy requirement for such machines being significantly lower than when working with pure gas as the pressure medium.
  • liquid piston is also supplemented with a template plate, which serves to protect against heat and diffusion, or another liquid which floats on the ionic liquid serving as pressurized fluid.
  • the ionic liquid can finally, with appropriate design of the hydroforming system in the pump have a different (lower) temperature than in the contact area to the gas.
  • FIG. 2 there are shown some delivery-grade curves as a function of the delivery pressure, wherein it is clearly evident that the use of an ionic liquid (IL) as hydraulic fluid achieves a significantly higher delivery rate than is the case with conventional hydraulic fluids.
  • IL ionic liquid

Landscapes

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

Abstract

L'invention concerne un procédé d'hydroformage de composants dans lequel une pièce à déformer est placée dans un outil divisible et est transformée en un produit qui présente la forme souhaitée par application d'une pression dans un fluide sous pression qui sert d'agent de transfert de pression. On procède en utilisant comme fluide sous pression un liquide ionisé. Actuellement, les liquides ionisés utilisés comme fluides sous pression dans la technique d'hydroformage selon l'invention peuvent être utilisés jusqu'à des températures très élevées. Cela permet avantageusement de réaliser un hydroformage à haute température à l'aide de liquides. En outre, la faible compressibilité des liquides ionisés permet d'obtenir une augmentation notable du rendement de l'opération de formage.
PCT/EP2007/010827 2006-12-13 2007-12-11 Procédé d'hydroformage de composants WO2008071396A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT07856575T ATE487549T1 (de) 2006-12-13 2007-12-11 Verfahren zum hydroformen von bauteilen
DE502007005635T DE502007005635D1 (de) 2006-12-13 2007-12-11 Verfahren zum hydroformen von bauteilen
EP07856575A EP2107953B1 (fr) 2006-12-13 2007-12-11 Procédé d'hydroformage de composants

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006060287 2006-12-13
DE102006060287.0 2006-12-13

Publications (1)

Publication Number Publication Date
WO2008071396A1 true WO2008071396A1 (fr) 2008-06-19

Family

ID=39331983

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/010827 WO2008071396A1 (fr) 2006-12-13 2007-12-11 Procédé d'hydroformage de composants

Country Status (4)

Country Link
EP (1) EP2107953B1 (fr)
AT (1) ATE487549T1 (fr)
DE (1) DE502007005635D1 (fr)
WO (1) WO2008071396A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2022574A1 (fr) * 2007-07-24 2009-02-11 Evonik Goldschmidt GmbH Utilisation de liquides ioniques pour la déformation sans tension de pièces à usiner métalliques

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0930109A2 (fr) * 1997-12-23 1999-07-21 GKN Sankey Limited Un procédé d' hydroformage
DE19907018A1 (de) * 1999-02-19 2000-08-24 Vaw Alutubes Gmbh Verfahren zum Verformen von Hohlkörpern aus Metall
US6264880B1 (en) * 1998-07-22 2001-07-24 The Regents Of The University Of California Manifold free multiple sheet superplastic forming
DE10240876A1 (de) * 2001-09-04 2003-03-27 Aisin Takaoka Ltd Verfahren zum Formen eines Metallelements

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0930109A2 (fr) * 1997-12-23 1999-07-21 GKN Sankey Limited Un procédé d' hydroformage
US6264880B1 (en) * 1998-07-22 2001-07-24 The Regents Of The University Of California Manifold free multiple sheet superplastic forming
DE19907018A1 (de) * 1999-02-19 2000-08-24 Vaw Alutubes Gmbh Verfahren zum Verformen von Hohlkörpern aus Metall
DE10240876A1 (de) * 2001-09-04 2003-03-27 Aisin Takaoka Ltd Verfahren zum Formen eines Metallelements

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2022574A1 (fr) * 2007-07-24 2009-02-11 Evonik Goldschmidt GmbH Utilisation de liquides ioniques pour la déformation sans tension de pièces à usiner métalliques

Also Published As

Publication number Publication date
DE502007005635D1 (de) 2010-12-23
EP2107953A1 (fr) 2009-10-14
EP2107953B1 (fr) 2010-11-10
ATE487549T1 (de) 2010-11-15

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