EP1985388B1 - Poutre métallique résistant aux hautes pressions et son procédé de fabrication - Google Patents
Poutre métallique résistant aux hautes pressions et son procédé de fabrication Download PDFInfo
- Publication number
- EP1985388B1 EP1985388B1 EP08014063A EP08014063A EP1985388B1 EP 1985388 B1 EP1985388 B1 EP 1985388B1 EP 08014063 A EP08014063 A EP 08014063A EP 08014063 A EP08014063 A EP 08014063A EP 1985388 B1 EP1985388 B1 EP 1985388B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal bellows
- profile
- corrugations
- strength
- forming
- 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
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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
- B21D15/00—Corrugating tubes
- B21D15/04—Corrugating tubes transversely, e.g. helically
- B21D15/06—Corrugating tubes transversely, e.g. helically annularly
-
- 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
- B21D15/00—Corrugating tubes
- B21D15/04—Corrugating tubes transversely, e.g. helically
- B21D15/10—Corrugating tubes transversely, e.g. helically by applying fluid pressure
Definitions
- the invention relates to a high-pressure-resistant metal bellows with annular corrugation and a method for producing such.
- a piece of pipe made of a metallic material by means of internal pressure deformation in a ring-corrugated metal bellows is formed (see, eg EP-A-1 199 116 ).
- the internal pressure forming is usually carried out by introducing a liquid into the pipe section under pressure, so that the pipe section bulges. This is done in a die, which prevents bulging of the pipe section at periodic intervals, so that a Vorwelle arises. By axially moving together the die results in the desired corrugation and a bellows is produced.
- the bellows shafts can be manufactured one after the other in a single tool or simultaneously in a multiple tool.
- Bellows for higher operating pressures are characterized by comparatively low profile heights, with bellows according to the prior art, the wave height is always greater than the wavelength in order to allow a subsequent compression of the bellows and thereby achieve a small overall length and a low spring rate.
- metal bellows should preferably be produced by means of internal pressure forming.
- high-pressure valves in particular injectors for fuels of all kinds, which, for example, in the EP-A-1 046 809 is described.
- injectors for fuels of all kinds which, for example, in the EP-A-1 046 809 is described.
- the metal bellows used should endure pulsating pressures up to 850 bar; for diesel injector applications, compressive strength should be sufficient even for pulsating pressures of 1400 bar and above.
- the present invention is therefore based on the object, a metal bellows and a method for producing such by means of internal pressure forming to improve so that a high-pressure-resistant metal bellows is formed or present.
- the present invention is therefore based on the finding that by using a bellows material with at least two metastable material states, the achievable pressure resistance of the metal bellows can be decoupled from the required forming pressure during production of the metal bellows. Because of the two metastable material states, one is a ductile material state and a second is a high-strength material state, the internal pressure forming for producing the metal bellows in the ductile material state can take place, which requires comparatively low forming pressures, while the metal bellows can be converted after the forming in its high-strength material state in which the use of the metal bellows takes place.
- metal bellows When the material is converted to its high-strength state, the compressive strength of the metal bellows increases as the yield strength of the material increases during the transition from the ductile state to the solid state of the material. In this way, it is possible to use metal bellows in high-pressure valves, these metal bellows static pressures above 750 bar withstand. In fuel injection valves, for example, a needle seal can be carried out with metal bellows which endure durable pressure pulses of 850 bar (gasoline) or 1400 bar (diesel) and above. High-pressure valves in the chemical industry for filling hydrogen or steam valves for energy systems, etc. are also suitable for the use of the high-pressure-resistant metal bellows according to the invention.
- the metal bellows metallic materials can be used, which preferably have a kfz crystal lattice in the ductile state.
- the high strength state is preferably achieved by precipitation hardening.
- materials Manual of German Aviation Part 1 Metallic Materials published by DIN - German Institute for Standardization - Aerospace Standards Institute, Beuth Verlag GmbH, 1991 edition described material 1.4564 and the methods listed to achieve the hardness states RH 950 or TZH 1050 mentioned.
- metallic materials which, in the ductile state, have a krz lattice and are hardened martensitic.
- corrugations are generated during forming which have a non-undercut profile in the radial direction, in particular a U-shaped or sinusoidal profile.
- a metal bellows with such a non-undercut corrugation already has a higher compressive strength compared to the conventional metal bellows with S-shaped or ⁇ -shaped waves due to its geometrical conditions, because the shaft geometry prevents the corrugations from being radially compressed - the metal bellows acts as in the case of just mentioned flat profile longer resistance to radial collapse under pressure.
- the metal bellows can be produced in multiple layers.
- the multiple layers are expediently each made of a material having a ductile and a high-strength material state.
- materials according to the DIN standards 1.4564, 1.4568, 2.4668 or AM 350 according to ASTM in question for example, materials according to the DIN standards 1.4564, 1.4568, 2.4668 or AM 350 according to ASTM in question.
- the profile of the corrugations on the inner rim at least a larger radius of curvature than at the outer rim, ie it may be a constant larger radius of curvature, but also to a plurality of radii of curvature, the steady merge into each other, such as in an elliptical shape.
- the radius of curvature can in this context also go against infinity, ie the inner brims of the corrugations may additionally or alternatively be provided with cylindrical sections.
- Such shaft geometries relieve those die parts of the forming tool in internal pressure forming that produce the inner rims by preventing bulging.
- the surface pressure is reduced to these die parts. This can be converted in the bellows production with higher internal pressures, which allows the use of a metallic material that has a relatively high compressive strength even in its ductile state, or it can be converted from several layers of metallic materials into a multilayer metal bellows, which in turn about n times higher pressure resistance than a single-layer metal bellows.
- FIG. 1 shows in a schematic, sectioned partial representation of an inventively designed metal bellows 1 with - here - three corrugations 2 with êtkrempen 3 and outer rim 4.
- the corrugations 2 are sinusoidal and thus not undercut in the radial direction.
- the profile of the corrugations 2 is designed such that a height h of a shaft in the radial direction, ie the distance between the radially highest point of the outer rim of the shaft and the two radially lowest points of the two adjacent inner rim, is smaller than a width d of these Shaft in the axial direction, that is, the axial distance between the two lowest points of the two adjacent inner rim of the corresponding shaft.
- the wave height of the corrugations 2 is smaller than their wavelength.
- the selected geometry of the corrugations 2 leads to a high geometric compressive strength, which is combined by the inventive choice of the metallic material and the inventive curing of the same after forming the metal bellows 1.
- a dynamic compressive strength greater than 500 bar can be achieved, while the same material in its ductile state at the currently achievable maximum flow limits of about 1200 MPa is sufficiently strong hydraulically deformable.
- FIG. 2 shows in a corresponding representation another metal bellows 1, which is provided with U-shaped corrugations 2 and thus also in the radial direction has no undercuts.
- FIG. 3 shows - again in a schematic sectional partial representation - further embodiments of a metal bellows 1, wherein the inner rim 3 shown on the left is formed as a cylindrical portion Z, while the inner rim shown on the right 3 has a relation to the outer rim 4 greatly enlarged radius of curvature R.
- FIG. 4 Finally, in a corresponding representation, a metal bellows 1 according to the prior art with undercut in the radial direction corrugations 2.
- the corrugations 2 have a conventional ⁇ -shaped profile.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Diaphragms And Bellows (AREA)
Claims (17)
- Procédé de fabrication d'un soufflet métallique résistant aux hautes pressions, sachant qu'un tronçon de tube constitué d'un matériau métallique est mis en forme en un soufflet métallique (1) à ondulation annulaire par formage sous pression intérieure, caractérisé en ce qu'on utilise comme matériau métallique un matériau présentant au moins deux états métastables dont l'un est un état ductile et l'autre un état à haute résistance avec limite d'élasticité accrue, en ce que le formage du tronçon de tube pour obtenir le soufflet métallique (1) s'effectue dans l'état ductile, et en ce que le matériau du soufflet métallique (1) est transféré à la suite du formage dans son état à haute résistance.
- Procédé selon la revendication 1, caractérisé en ce que, lors du formage du tronçon de tube pour obtenir le soufflet métallique (1) à ondulation annulaire, on produit des ondulations (2) ayant un profil selon lequel la hauteur (h) d'une ondulation en direction radiale est inférieure ou égale à la largeur (d) de cette ondulation en direction axiale.
- Procédé selon la revendication 1 ou 2, caractérisé en ce que, lors du formage du tronçon de tube pour obtenir le soufflet métallique (1) à ondulation annulaire, on produit des ondulations (2) qui présentent un profil sans contre-dépouille en direction radiale, en particulier un profil en forme de U ou sinusoïdal.
- Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'on met en forme un tronçon de tube à plusieurs couches pour obtenir le soufflet métallique (1) à ondulation annulaire.
- Procédé selon l'une des revendications 1 à 4, caractérisé en ce qu'on utilise un matériau selon les normes DIN 1.4564, 1.4568, 2.4668, ou AM 350 selon ASTM.
- Soufflet métallique résistant aux hautes pressions, à ondulation annulaire (2), caractérisé en ce que le soufflet métallique (1) est constitué d'un matériau métallique présentant au moins deux états métastables dont l'un est un état ductile et l'autre un état à haute résistance avec limite d'élasticité accrue.
- Soufflet métallique selon la revendication 6, caractérisé en ce que le matériau métallique présente dans son état à haute résistance des propriétés martensitiques ou des propriétés mixtes austénitiques/martensitiques.
- Soufflet métallique selon la revendication 6 ou 7, caractérisé en ce que le matériau métallique présente dans son état ductile un réseau métallique cubique centré ou cubique à faces centrées.
- Soufflet métallique selon l'une des revendications 6 à 8, caractérisé en ce que les ondulations (2) présentent un profil selon lequel la hauteur (h) d'une ondulation en direction radiale est inférieure ou égale à la largeur (d) de cette ondulation en direction axiale.
- Soufflet métallique selon l'une des revendications 6 à 9, caractérisé en ce que les ondulations (2) présentent un profil sans contre-dépouille en direction radiale, en particulier un profil en forme de U ou sinusoïdal.
- Soufflet métallique selon l'une des revendications 6 à 10, caractérisé en ce que le profil des ondulations (2) présente, sur leurs sommets intérieurs (3), au moins un plus grand rayon de courbure (R) que sur leurs sommets extérieurs (4).
- Soufflet métallique selon l'une des revendications 6 à 11, caractérisé en ce que les sommets intérieurs (3) des ondulations (2) sont pourvus de parties cylindriques (Z).
- Soufflet métallique selon l'une des revendications 6 à 12, caractérisé en ce qu'il est réalisé à plusieurs couches.
- Soufflet métallique selon l'une des revendications 6 à 13, caractérisé en ce qu'il est constitué d'un matériau selon les normes DIN 1.4564, 1.4568, 2.4668, ou AM 350 selon ASTM.
- Soufflet métallique selon l'une des revendications 6 à 14, caractérisé en ce qu'il a été fabriqué d'après un procédé selon l'une des revendications 1 à 5.
- Soufflet métallique selon l'une des revendications 6 à 15, caractérisé en ce qu'il est conçu pour une sollicitation en pression statique d'au moins 750 bars et/ou pour une sollicitation en pression dynamique d'au moins 400 bars.
- Soufflet métallique selon l'une des revendications 6 à 16, caractérisé en ce qu'il est prévu pour être utilisé dans des soupapes à haute pression avec des impulsions de pression supérieures à 400 bars, en particulier dans des soupapes d'injection de carburants.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08014063A EP1985388B1 (fr) | 2008-08-06 | 2008-08-06 | Poutre métallique résistant aux hautes pressions et son procédé de fabrication |
AT08014063T ATE461764T1 (de) | 2008-08-06 | 2008-08-06 | Hochdruckfester metallbalg und verfahren zum herstellen eines solchen |
DE502008000464T DE502008000464D1 (de) | 2008-08-06 | 2008-08-06 | Hochdruckfester Metallbalg und Verfahren zum Herstellen eines solchen |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP08014063A EP1985388B1 (fr) | 2008-08-06 | 2008-08-06 | Poutre métallique résistant aux hautes pressions et son procédé de fabrication |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1985388A1 EP1985388A1 (fr) | 2008-10-29 |
EP1985388B1 true EP1985388B1 (fr) | 2010-03-24 |
Family
ID=39730825
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08014063A Not-in-force EP1985388B1 (fr) | 2008-08-06 | 2008-08-06 | Poutre métallique résistant aux hautes pressions et son procédé de fabrication |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1985388B1 (fr) |
AT (1) | ATE461764T1 (fr) |
DE (1) | DE502008000464D1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013006009B3 (de) * | 2013-04-09 | 2014-07-31 | Boa Balg- Und Kompensatoren-Technologie Gmbh | Verfahren zum Herstellen eines Balgs und/oder Balg |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013111737B4 (de) * | 2013-10-24 | 2023-12-07 | Witzenmann Gmbh | Verstärktes Leitungselement und Verwendung eines solchen |
US11879569B2 (en) | 2021-07-12 | 2024-01-23 | Supercool Metals LLC | Flexible bulk metallic glass elements |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3614290A1 (de) * | 1986-04-26 | 1987-10-29 | Messer Griesheim Gmbh | Druckgasbehaelter aus einer austenitischen stahllegierung |
EP0623739B1 (fr) * | 1993-05-03 | 1995-12-20 | Volkswagen Aktiengesellschaft | Collecteur |
DE50010902D1 (de) | 1999-04-20 | 2005-09-15 | Siemens Ag | Fluiddosiervorrichtung |
DE10051946A1 (de) * | 2000-10-19 | 2002-05-29 | Omg Ag & Co Kg | Verfahren zur Herstellung von aus PGM-Werkstoffen gefertigten rohrförmigen Konstrutkrionsteilen mit radial umlaufenden wellenförmigen Auswölbungen |
DE10239372B3 (de) * | 2002-08-28 | 2004-03-11 | Mq Engineering Gmbh | Verfahren zur Herstellung von Umformteilen |
-
2008
- 2008-08-06 EP EP08014063A patent/EP1985388B1/fr not_active Not-in-force
- 2008-08-06 AT AT08014063T patent/ATE461764T1/de active
- 2008-08-06 DE DE502008000464T patent/DE502008000464D1/de active Active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013006009B3 (de) * | 2013-04-09 | 2014-07-31 | Boa Balg- Und Kompensatoren-Technologie Gmbh | Verfahren zum Herstellen eines Balgs und/oder Balg |
US9797530B2 (en) | 2013-04-09 | 2017-10-24 | Boa Balg- Und Kompensatoren-Technologie Gmbh | Process for manufacturing a bellows and/or bellows |
Also Published As
Publication number | Publication date |
---|---|
ATE461764T1 (de) | 2010-04-15 |
DE502008000464D1 (de) | 2010-05-06 |
EP1985388A1 (fr) | 2008-10-29 |
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