EP1985388A1 - Hochdruckfester Metallbalg und Verfahren zum Herstellen eines solchen - Google Patents

Hochdruckfester Metallbalg und Verfahren zum Herstellen eines solchen Download PDF

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Publication number
EP1985388A1
EP1985388A1 EP08014063A EP08014063A EP1985388A1 EP 1985388 A1 EP1985388 A1 EP 1985388A1 EP 08014063 A EP08014063 A EP 08014063A EP 08014063 A EP08014063 A EP 08014063A EP 1985388 A1 EP1985388 A1 EP 1985388A1
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EP
European Patent Office
Prior art keywords
metal bellows
profile
corrugations
pressure
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.)
Granted
Application number
EP08014063A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1985388B1 (de
Inventor
Jochen Glas
Alexander Greif
Andreas Dr. Kämpfe
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.)
Witzenmann GmbH
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Witzenmann 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 Witzenmann GmbH filed Critical Witzenmann GmbH
Priority to AT08014063T priority Critical patent/ATE461764T1/de
Priority to DE502008000464T priority patent/DE502008000464D1/de
Priority to EP08014063A priority patent/EP1985388B1/de
Publication of EP1985388A1 publication Critical patent/EP1985388A1/de
Application granted granted Critical
Publication of EP1985388B1 publication Critical patent/EP1985388B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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 forming in a ring-corrugated metal bellows is formed.
  • 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 than 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)
EP08014063A 2008-08-06 2008-08-06 Hochdruckfester Metallbalg und Verfahren zum Herstellen eines solchen Not-in-force EP1985388B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
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
EP08014063A EP1985388B1 (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 (de) 2008-08-06 2008-08-06 Hochdruckfester Metallbalg und Verfahren zum Herstellen eines solchen

Publications (2)

Publication Number Publication Date
EP1985388A1 true EP1985388A1 (de) 2008-10-29
EP1985388B1 EP1985388B1 (de) 2010-03-24

Family

ID=39730825

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08014063A Not-in-force EP1985388B1 (de) 2008-08-06 2008-08-06 Hochdruckfester Metallbalg und Verfahren zum Herstellen eines solchen

Country Status (3)

Country Link
EP (1) EP1985388B1 (tr)
AT (1) ATE461764T1 (tr)
DE (1) DE502008000464D1 (tr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013111737A1 (de) * 2013-10-24 2015-04-30 Witzenmann Gmbh Verstärktes Leitungselement und Verwendung eines solchen
US11879569B2 (en) 2021-07-12 2024-01-23 Supercool Metals LLC Flexible bulk metallic glass elements

Families Citing this family (1)

* Cited by examiner, † Cited by third party
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3614290A1 (de) * 1986-04-26 1987-10-29 Messer Griesheim Gmbh Druckgasbehaelter aus einer austenitischen stahllegierung
EP0623739A1 (de) * 1993-05-03 1994-11-09 Volkswagen Aktiengesellschaft Rohrkrümmer
EP1046809A2 (de) 1999-04-20 2000-10-25 Siemens Aktiengesellschaft Fluiddosiervorrichtung
EP1199116A2 (de) * 2000-10-19 2002-04-24 OMG AG & Co. KG Verfahren zur Herstellung von rohrförmigen Konstruktionsteilen mit radial umlaufenden wellenförmigen Auswölbungen
DE10239372B3 (de) * 2002-08-28 2004-03-11 Mq Engineering Gmbh Verfahren zur Herstellung von Umformteilen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3614290A1 (de) * 1986-04-26 1987-10-29 Messer Griesheim Gmbh Druckgasbehaelter aus einer austenitischen stahllegierung
EP0623739A1 (de) * 1993-05-03 1994-11-09 Volkswagen Aktiengesellschaft Rohrkrümmer
EP1046809A2 (de) 1999-04-20 2000-10-25 Siemens Aktiengesellschaft Fluiddosiervorrichtung
EP1199116A2 (de) * 2000-10-19 2002-04-24 OMG AG & Co. KG Verfahren zur Herstellung von rohrförmigen Konstruktionsteilen mit radial umlaufenden wellenförmigen Auswölbungen
DE10239372B3 (de) * 2002-08-28 2004-03-11 Mq Engineering Gmbh Verfahren zur Herstellung von Umformteilen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Herausgeber DIN - Deutsches Institut für Normung e. V. - Normenstelle Luftfahrt", 1991, BEUTH VERLAG GMBH, article "Werkstoff-Handbuch der Deutschen Luftfahrt Teil 1 Metallische Werkstoffe"

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013111737A1 (de) * 2013-10-24 2015-04-30 Witzenmann Gmbh Verstärktes Leitungselement und Verwendung eines solchen
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

Also Published As

Publication number Publication date
DE502008000464D1 (de) 2010-05-06
EP1985388B1 (de) 2010-03-24
ATE461764T1 (de) 2010-04-15

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