WO2008071396A1 - Procédé d'hydroformage de composants - Google Patents
Procédé d'hydroformage de composants Download PDFInfo
- 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
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.
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)
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)
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 |
-
2007
- 2007-12-11 AT AT07856575T patent/ATE487549T1/de active
- 2007-12-11 DE DE502007005635T patent/DE502007005635D1/de active Active
- 2007-12-11 WO PCT/EP2007/010827 patent/WO2008071396A1/fr active Application Filing
- 2007-12-11 EP EP07856575A patent/EP2107953B1/fr not_active Not-in-force
Patent Citations (4)
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)
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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