EP2107953B1 - Procédé d'hydroformage de composants - Google Patents

Procédé d'hydroformage de composants Download PDF

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Publication number
EP2107953B1
EP2107953B1 EP07856575A EP07856575A EP2107953B1 EP 2107953 B1 EP2107953 B1 EP 2107953B1 EP 07856575 A EP07856575 A EP 07856575A EP 07856575 A EP07856575 A EP 07856575A EP 2107953 B1 EP2107953 B1 EP 2107953B1
Authority
EP
European Patent Office
Prior art keywords
ionic liquid
hydroforming
pressure
gas
fluid
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.)
Not-in-force
Application number
EP07856575A
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German (de)
English (en)
Other versions
EP2107953A1 (fr
Inventor
Eberhard Schlücker
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.)
Friedrich Alexander Univeritaet Erlangen Nuernberg FAU
Original Assignee
Friedrich Alexander Univeritaet Erlangen Nuernberg FAU
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 Univeritaet Erlangen Nuernberg FAU filed Critical Friedrich Alexander Univeritaet Erlangen Nuernberg FAU
Publication of EP2107953A1 publication Critical patent/EP2107953A1/fr
Application granted granted Critical
Publication of EP2107953B1 publication Critical patent/EP2107953B1/fr
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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

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 based on the object to provide an improved method for hydroforming of components to avoid the disadvantages described.
  • the features of the invention to solve this problem emerge from claim 1.
  • Advantageous embodiments thereof are described in the further claims.
  • the pressure fluid is an ionic liquid is used, which has a high temperature resistance to at least 550 ° C and consists of an organic ionic liquid or an inorganic ionic liquid or a mixture of these two liquids.
  • 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 for 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 compresses 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.
  • 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.

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

Claims (7)

  1. Procédé pour l'hydroformage de composants, dans lequel une pièce à oeuvrer qu'il s'agit de déformer est mise en place dans un outil séparable et est mise en forme, pour donner un produit avec la configuration souhaitée, en utilisant la pression d'un fluide sous pression servant de moyen de transmission de pression,
    caractérisé en ce que l'on utilise à titre de fluide sous pression lors de l'hydroformage un liquide ionique qui présente une haute résistance à la température jusqu'à au moins 550°C et qui est constitué par un liquide ionique organique ou par un liquide ionique inorganique ou encore un mélange de ceux-ci.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on laisse agir le liquide ionique utilisé à titre de fluide sous pression indirectement sur le composant qu'il s'agit de former par l'intermédiaire d'un gaz qui à été tout d'abord rempli dans le composant et/ou dans un compartiment qui se trouve devant celui-ci.
  3. Procédé selon la revendication 2, caractérisé en ce que le gaz est comprimé par un piston liquide formé par un liquide ionique.
  4. Procédé selon la revendication 2 ou 3, caractérisé en ce que le composant à former est préchauffé avant d'être soumis au gaz comprimé par le liquide ionique.
  5. Procédé selon l'une des revendications 2 à 4, caractérisé en ce que l'on laisse agir le liquide ionique sur le gaz via un moyen intermédiaire agencé entre eux.
  6. Procédé selon la revendication 5, caractérisé en ce que l'on utilise une plaque préliminaire à titre de moyen intermédiaire.
  7. Procédé selon la revendication 5, caractérisé en ce que l'on utilise à titre de moyen intermédiaire un autre liquide qui flotte sur le liquide ionique.
EP07856575A 2006-12-13 2007-12-11 Procédé d'hydroformage de composants Not-in-force EP2107953B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006060287 2006-12-13
PCT/EP2007/010827 WO2008071396A1 (fr) 2006-12-13 2007-12-11 Procédé d'hydroformage de composants

Publications (2)

Publication Number Publication Date
EP2107953A1 EP2107953A1 (fr) 2009-10-14
EP2107953B1 true EP2107953B1 (fr) 2010-11-10

Family

ID=39331983

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07856575A Not-in-force EP2107953B1 (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)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007034353A1 (de) * 2007-07-24 2009-01-29 Evonik Goldschmidt Gmbh Verwendung von ionischen Flüssigkeiten für die spanlose Umformung von metallischen Werkstücken

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9727063D0 (en) * 1997-12-23 1998-02-18 Gkn Sankey Ltd A hydroforming process
US6264880B1 (en) * 1998-07-22 2001-07-24 The Regents Of The University Of California Manifold free multiple sheet superplastic forming
DE19907018B4 (de) * 1999-02-19 2006-08-24 Vaw Alutubes Gmbh Verfahren zum Verformen von Hohlkörpern aus Metall
JP3761820B2 (ja) * 2001-09-04 2006-03-29 アイシン高丘株式会社 金属部材成形方法

Also Published As

Publication number Publication date
WO2008071396A1 (fr) 2008-06-19
ATE487549T1 (de) 2010-11-15
DE502007005635D1 (de) 2010-12-23
EP2107953A1 (fr) 2009-10-14

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