EP0212712A1 - Verfahren zur Herstellung von geschlossenen und nahtlosen Hohlkörpern, nach dem Verfahren hergestellte Hohlkörper und Vorrichtung zur Herstellung von Hohlkugeln - Google Patents

Verfahren zur Herstellung von geschlossenen und nahtlosen Hohlkörpern, nach dem Verfahren hergestellte Hohlkörper und Vorrichtung zur Herstellung von Hohlkugeln Download PDF

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Publication number
EP0212712A1
EP0212712A1 EP86201286A EP86201286A EP0212712A1 EP 0212712 A1 EP0212712 A1 EP 0212712A1 EP 86201286 A EP86201286 A EP 86201286A EP 86201286 A EP86201286 A EP 86201286A EP 0212712 A1 EP0212712 A1 EP 0212712A1
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EP
European Patent Office
Prior art keywords
cores
bath
layer
solvent
hollow
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
EP86201286A
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English (en)
French (fr)
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EP0212712B1 (de
Inventor
Yves Blottiere
Jean-Pierre Bonino
Abel Rousset
Claude Rossignol
Isabelle née Heraud Gossart
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.)
Ateca SA
Universite Toulouse III Paul Sabatier
Original Assignee
Ateca SA
Universite Toulouse III Paul Sabatier
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 Ateca SA, Universite Toulouse III Paul Sabatier filed Critical Ateca SA
Priority to AT86201286T priority Critical patent/ATE42774T1/de
Publication of EP0212712A1 publication Critical patent/EP0212712A1/de
Application granted granted Critical
Publication of EP0212712B1 publication Critical patent/EP0212712B1/de
Expired legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D1/00—Electroforming
    • C25D1/02—Tubes; Rings; Hollow bodies

Definitions

  • the invention relates to a method for manufacturing hollow, closed and continuous bodies; it applies in particular to the manufacture of hollow beads composed of a continuous spheroid skin surrounding an empty internal volume.
  • the invention extends to hollow bodies, in particular hollow balls, produced by implementing the method. It also relates to an installation adapted to the implementation of a preferential step of said process.
  • hollow bodies having no macroscopic discontinuity on their surface; generally, the aim is to lighten the weight of a part, while allowing it to perfectly meet the requirements of the application concerned.
  • These hollow beads can in particular be used to produce a modular composite material characterized essentially by its lightness and isotropic properties, easy to adapt to needs.
  • Hollow balls also have an interesting application in catalysis materials because they make it possible to obtain very large specific surfaces per unit of weight.
  • rolling balls hollow mechanical parts combining great lightness with appropriate mechanical strength, etc.
  • a first type of known process consists in manufacturing two shells by molding or stamping and in assembling them by any known means. This process comprises several successive stages each requiring establishment operations pre- cises on workstations and its implementation is justified only in the case of high value unit parts.
  • Another method which has the advantage of making it possible to precisely reproduce a given shape, consists in individually producing each hollow body by electroforming at the end of a soluble electrode around a destructible mandrel.
  • this process is very expensive; moreover it leads to hollow bodies which necessarily include an extraction orifice.
  • Another type of process consists in coating a core with a solid coating and then making a hole in this coating / to allow the passage of a solvent capable of dissolving said core (patent FR n ° 1 311 777, patent US No. 4,464,231).
  • this process which requires individual mechanical drilling of each ball, is incompatible with bulk production and therefore has the above-mentioned defects.
  • the hole made in the ball affects its homogeneity and its overall resistance.
  • the present invention proposes to indicate a new method for manufacturing hollow, closed and continuous bodies.
  • An object of the invention is to provide a method capable of being implemented on loose parts which therefore do not have to be positioned during the treatment phases.
  • Another objective of the invention is to make it possible to obtain hollow bodies, in particular hollow balls,) each formed by a continuous skin free of any macroscopic perforation.
  • Another objective is to authorize the production of hollow bodies in very diverse materials and with easily adjustable thicknesses according to the desired properties.
  • Another objective is to make it possible to manufacture composite hollow bodies, that is to say the skin of which is made up of several layers which can have different properties and can be combined to meet the requirements of the application concerned.
  • Another objective is to indicate a process which lends itself perfectly to the production at low cost and in very large quantity, of small hollow balls having an external diameter greater than 0.6 mm and with a skin thickness at least equal to 50 microns.
  • Another objective is to allow the surface condition of the hollow bodies or hollow balls to be adapted to the applications envisaged.
  • the method of the invention leads to producing each hollow body by depositing a continuous but porous coating in order to then allow the internal cores to be eliminated by dissolution through the porosities.
  • cores of spherical shape are used, which have a diameter adapted to that of the balls to be obtained, generally greater than 0.5 mm.
  • the method of the invention only comprises operations which can be carried out on bulk products and thus eliminates any incidental positioning operation, a factor which considerably increases costs. of implementation.
  • it provides hollow bodies whose surface is continuous in its entirety without perforation or macroscopic discontinuity.
  • cores are used having a plurality of small cavities opening onto the external surface of said cores, and (b) a deposit of material is produced, essentially on the surfaces outside cavities so as to obtain a coating having pores at the level of said cavities.
  • a deposit of material is produced, essentially on the surfaces outside cavities so as to obtain a coating having pores at the level of said cavities.
  • cores of expanded synthetic material with cells opening on their external surface.
  • the cores used in the process of the invention can be produced in the form adapted by any known process, in particular in the case of beads of expanded material, by spraying drops of expandable material in a liquid. This type of process is currently well known and makes it possible to obtain spherical cores of diameters adjustable according to the conditions of implementation.
  • Such a metallization process is itself known and already used to obtain metallized plastic objects (however the metallization is then carried out on a compact continuous surface and provides a compact metallic layer).
  • the small cavities of the cores lead to a porous coating which allows the subsequent implementation of the dissolution phase.
  • the chemical frosting operation (b l ) notably consists in immersing the loose nuclei in a dilute solvent or dilute acid, with stirring of the said nuclei inside the bath, then rinsing them off after a period of immersion corresponding to a surface attack of the nuclei. This etching changes the surface state of the core between the cavities and creates roughness which then ensures good adhesion of the thin conductive layer deposited in the following operation (b 2 ).
  • chemical etching (b l ) is carried out by immersion in acetone diluted in water, in volume concentration between 50% and 90% for a period of between 600 and 5 seconds.
  • the immersion time is adjusted in this range as an inverse function of the concentration in order to obtain sufficient local attacks on the surface of the nuclei, while avoiding destruction of the latter or excessively significant changes in shape.
  • the metallization layer or layers deposited in phase (b 2 ) have a very small thickness, because the simple immersion technique does not in practice make it possible to obtain layers of thickness exceeding 5 microns. This or these metallization layers simply aim to make the surface of the core conductive in order to then carry out the electrodeposition ( b 3) which makes it possible to deposit layers thickness adjustable at will.
  • this metallization phase (b 2 ) can be carried out by immersing the loose cores, successively in three metallization chemical baths, the first based on a tin salt in order to deposit a thin film.
  • tin sensitization the second based on a silver or palladium salt in order to deposit a thin catalytic film in silver or palladium
  • the third based on a copper or nickel salt in order to deposit a thin conductive layer of copper or nickel.
  • the thin tin film promotes redox reactions during immersion in the second bath, but is not sufficient to provide a suitable conductivity surface.
  • In the tin bath are preferably included surface-active products which promote wetting of the surface of the cores.
  • the thin film of silver or palladium has a catalytic function when immersed in the third bath, but would also be insufficient to give the surface an appropriate conductivity during electroplating.
  • the conductive thin layer obtained during immersion in the third bath may have a thickness of the order of 10 microns and has an electrical conductivity perfectly suited to the implementation of the electroplating operation.
  • the electrolytic bath may in particular be based on nickel salt in order to obtain a crystallized layer of nickel or of nickel alloy. It can also be nickel salt base with addition of metalloid complexes (known per se) in order to obtain a layer of amorphous nickel alloy.
  • a self-supporting coating is thus obtained, the thickness of which, preferably greater than 50 microns, can be adjusted by a simple adjustment of the duration of the electrodeposition operation.
  • the thin conductive layer (b 2 ) essentially affects the external surface outside the cavity of the cores: consequently, the electrolytic deposition takes place only on this surface, which ensures the porous nature of the coating whatever its thickness. .
  • electrodeposition it is possible to successively carry out several electrodepositions in order to obtain a multi-layer coating, the layers of which may be of different nature in order to have different properties.
  • electrodeposition commonly makes it possible to deposit metals such as nickel, iron, chromium, molybdenum tungsten, cobalt and alloys of these metals, crystallized or amorphous.
  • This or these electrodeposition operations may if necessary be followed by a chemical deposition of a metal layer (b 4 ) by immersion in a chemical metallization bath in order to form a thin layer on the surface; this new deposition takes place on the metal already electrodeposited, which plays a catalytic role with respect to said deposition, which makes it possible to preserve the porous nature of the coating; the new layer obtained may be advantageous in certain applications either to provide the hollow body or hollow ball with an anti-corrosion surface state (example: nickel / phosphorus, nickel / boron alloy layers, etc.), or even to increase the electrical conductivity characteristics of the hollow body (new copper layer).
  • operation (c) of dissolving the cores is carried out cold or at low temperature, by bulk immersion in a solvent; it makes it possible to completely eliminate each core without modifying the skin previously formed and without causing pollution thereof or the appearance of mechanical stress in said skin.
  • such dissolution makes it possible to avoid the grain magnification in crystallized alloys, and therefore retains the hardness properties of the coating; in the case of an amorphous coating; such dissolution erodes any risk of recrystallization of the material which would modify its properties.
  • the internal thin films or layers which were used to carry out the electrodeposition can themselves be dissolved in a selective solvent, preserving the upper layer or layers of electrodeposition .
  • This layer can be formed by using a wide variety of known methods (soaking, cathodic pulverization, vacuum evaporation, chemical vapor deposition, overmolding, etc.) and can thus be produced from a wide variety of materials ( crystallized or amorphous alloys, refractory steels, ceramics, plastics, metal oxides and their alloys, elastomers ).
  • the invention extends, as a new product, to hollow bodies, in particular of spheroid shape, manufactured by implementing the method defined above, each hollow body being characterized by the presence of a closed and continuous skin, located around of an internal empty volume.
  • the invention relates to a soaking installation making it possible to carry out, under good conditions, the operation (d) of soaking hollow beads, with the aim of producing a compact layer around the porous coatings after dissolution of the cores;
  • the installation according to the present invention comprises a crucible containing a liquid bath of hardenable material, a rotating wheel arranged above the crucible so that its periphery passes in the vicinity of the surface of the bath, means for driving in rotation of said wheel, a chute openwork for guiding the balls having a portion located in the crucible so as to pass through the bath in the vicinity of the periphery of the wheel, means for feeding said chute into balls and means for receiving the balls ejected at the outlet of the chute .
  • the installation shown diagrammatically in FIG. 1 allows the following operations to be carried out on the loose beads: (b l ) etching of the spheroid-shaped cores, (b 2 ) deposition of a tin sensitization film, deposition of a silver or palladium catalytic film and deposit of a conductive layer of copper or nickel, (c) dissolution of the nuclei.
  • This installation comprises a tank 1 filled by means of a bath, suitable for the treatment to be carried out.
  • This bath is circulated by a pump 2 which takes it up at the top in an overflow tank 3 and discharges it, at the bottom, into the tank.
  • Pump 2 is associated with filtering means 4.
  • the tank 1 contains an openwork barrel 5 which is rotatably mounted on two pivots carried by columns 6; this barrel, generally made of polypropylene with openwork meshes, carries on its periphery a toothed ring engaged with gears, themselves actuated by an electric motor.
  • This speed of rotation of the barrel used in the examples being 50 revolutions / minute.
  • the barrel has internally deflectors 7 which ensure agitation of the balls in the bath.
  • a system of heating rods associated with thermostats allows if necessary to bring the bath up to a temperature of the order of 100 ° C.
  • the installation shown diagrammatically in FIG. 2 enables one or more electroplating operations to be carried out on the loose balls (b 3 ) '.
  • the anodes 8 are connected in parallel with one another on the positive terminal of a continuous supply of stabilized current, while the cathodes are connected in parallel with one another on the negative terminal of this supply.
  • the speed of rotation of the barrel used in the examples being 0.6 revolutions / minute.
  • FIGS. 3 and 4 makes it possible to carry out on the loose balls an additional operation (d) of depositing one or more compact layers after dissolution of the cores.
  • This installation comprises a closed enclosure 10 comprising an inlet 11 through which penetrate ball supply means 12, and an outlet 13 through which the balls are ejected; means for receiving the balls (not shown) are associated with this outlet 13 outside the enclosure; these means can be constituted by a refrigerated enclosure.
  • the enclosure 10 contains a crucible 14 in which is disposed a liquid bath of hardenable material to be deposited; this crucible 14 is carried by means for adjusting its height: micrometric screw 15 moving a trapezoidal shim 16 on which a crucible support 17 comes to bear.
  • the crucible 14 is equipped with heating means such as electrical resistance 18 (or induction heating); a thermostatic device (not shown) makes it possible to regulate the temperature of the bath to the precise value desired.
  • heating means such as electrical resistance 18 (or induction heating); a thermostatic device (not shown) makes it possible to regulate the temperature of the bath to the precise value desired.
  • the crucible 14 is provided with means for regulating the level of the liquid bath; in the example, these means are constituted by a microswitch symbolized in 19 which controls the admission of material (generally in the form of powder or, if necessary in liquid form) into an inlet duct 20.
  • these means for regulating level can also be constituted by any other known system and in particular by an optical system.
  • the enclosure contains a rotating wheel 21 carried by a shaft 22 driven by an electric motor (not shown) at a rotation speed of 300 revolutions / minute in the examples.
  • This wheel 21 is placed in a vertical plane above the crucible 14 so that its periphery passes in the vicinity of the surface of the bath without contact therewith.
  • a chute 23 for guiding the balls is disposed between the supply means (conduit 12) and the crucible 14; this chute comprises an openwork portion 23a which is located in the crucible and crosses the bath in the vicinity of the periphery of the wheel 21.
  • This portion 23a has the shape of a sector of a concentric circle with the wheel so as to cover in the lower part the periphery of said wheel which penetrates into the trough as far as the vicinity of the surface of the bath.
  • a porthole 24 allows the interior of the enclosure to be observed.
  • the balls to be coated are introduced through the conduit 12 into the chute 23; this introduction can be carried out individually by a vibrating bowl. They travel by gravity to the surface of the bath, where they are driven by the wheel 21; the latter turns them on themselves and immerses them in the bath, while driving them towards the exit.
  • the hollow balls manufactured in this example are intended for the production of a modular composite material described in the patent application already mentioned filed simultaneously with the present application.
  • the beads are made from spheroid cores of expanded polystyrene, as shown diagrammatically at 25 in FIG. 5a.
  • the diameter of said cores is selected so as to be approximately 6 mm.
  • the density of the cores is 80 Kg / m3 .
  • Each core has a multitude of small cavities such as 26 opening on their external surface.
  • each core has a roughness as shown diagrammatically in FIG. 5b, which allows the attachment of the first film deposited in the following phase.
  • the treatment temperature is 20 ° C and. its duration of 10 seconds.
  • the treatment temperature is 20 ° C and its duration 20 minutes.
  • This treatment is followed by two rinses with deionized water and provides a thin conductive layer of copper.
  • each core has the appearance shown in FIG. 5c: the surface outside the cavities of the cores is covered with a first very thin film of tin 27, of a second thicker silver film 28, finally with a thin layer of copper 29 of greater thickness (of the order of 10 microns).
  • the beads obtained have the appearance shown diagrammatically in FIG. 5d.
  • the conductive layer 29 is covered with a layer of crystallized nickel 30 with a thickness of the order of 120 microns.
  • All of these layers form a coating which has open porosities at the level of the cavities 26 of the polystyrene core.
  • an additional layer is deposited chemically on the nickel layer 30 in order to improve the corrosion resistance of the beads.
  • This additional layer which is shown diagrammatically at 31 in FIG. 5f preserves the porous nature of the coating and can therefore be deposited before the dissolution of the cores.
  • the temperature of the bath was brought to 98 ° C. and the treatment was followed by two rinses with deionized water and by drying in an oven.
  • This phase consists in immersing the beads by means of the installation of FIG. 1, in a pure solvent of perchlorethylene, for 30 minutes (FIG. 5f).
  • the nuclei are completely dissolved, and the beads are then dried in an oven.
  • beads are obtained as shown diagrammatically 32, having a diameter of the order of 6 mm, each having a continuous skin free of macroscopic discontinuity.
  • the beads have very homogeneous physicochemical characteristics, the tests having given a very low dispersion of the results.
  • phase for dissolving the nuclei (c) is then carried out as in this example 1 .
  • This deposition by dipping is carried out by placing in the crucible 14 a molten iron / chromium bath, of composition 75/25 at a temperature of 1520 ° C.
  • the enclosure 10 is filled with a reducing atmosphere formed by nitrogen. Ball of residence time in the bath can be rated at 2/10 to 3/10 second.
  • a deposit of crystallized iron / chromium alloy with a thickness of the order of 100 microns is obtained, which removes the porosity of the beads and provides them with good mechanical properties when hot.
  • the beads thus obtained are then subjected to a chemical vapor deposition (CVD) of the traditional type with a view to coating them with a deposit of silicon oxide (symbolized at 34 in FIG. 6h).
  • CVD chemical vapor deposition
  • Such a surface deposit whose thickness is of the order of 10 microns gives with the ball an electrically insulating character and a good capacity of resistance to corrosion.
  • the process of the invention makes it possible to obtain balls (and more generally hollow bodies) which are able to meet the requirements of the targeted applications: mechanical, electrical, thermal, magnetic, elastic characteristics, etc.
  • the table in FIG. 7 illustrates the wide possibilities of choice that the process allows.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Moulding By Coating Moulds (AREA)
  • Chemical Vapour Deposition (AREA)
  • Coating With Molten Metal (AREA)
  • Physical Vapour Deposition (AREA)
  • Chemically Coating (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
EP86201286A 1985-07-25 1986-07-22 Verfahren zur Herstellung von geschlossenen und nahtlosen Hohlkörpern, nach dem Verfahren hergestellte Hohlkörper und Vorrichtung zur Herstellung von Hohlkugeln Expired EP0212712B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86201286T ATE42774T1 (de) 1985-07-25 1986-07-22 Verfahren zur herstellung von geschlossenen und nahtlosen hohlkoerpern, nach dem verfahren hergestellte hohlkoerper und vorrichtung zur herstellung von hohlkugeln.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8511747A FR2585373B1 (fr) 1985-07-25 1985-07-25 Procede de fabrication de corps creux, fermes et continus, corps creux obtenus et installation de mise en oeuvre dans le cas de billes creuses
FR8511747 1985-07-25

Publications (2)

Publication Number Publication Date
EP0212712A1 true EP0212712A1 (de) 1987-03-04
EP0212712B1 EP0212712B1 (de) 1989-05-03

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EP86201286A Expired EP0212712B1 (de) 1985-07-25 1986-07-22 Verfahren zur Herstellung von geschlossenen und nahtlosen Hohlkörpern, nach dem Verfahren hergestellte Hohlkörper und Vorrichtung zur Herstellung von Hohlkugeln

Country Status (6)

Country Link
US (1) US4722770A (de)
EP (1) EP0212712B1 (de)
JP (1) JPH0776435B2 (de)
AT (1) ATE42774T1 (de)
DE (1) DE3663153D1 (de)
FR (1) FR2585373B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2672652A1 (fr) * 1991-02-12 1992-08-14 Lacroix E Tous Artifices Systeme d'amortissement notamment pour systemes d'arme.
EP0794341A1 (de) * 1996-03-06 1997-09-10 Skf Gmbh Lagerung von Rollen

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IN174705B (de) * 1988-09-09 1995-02-18 Daya Ranjit Senanayake
JPH06207294A (ja) * 1990-12-18 1994-07-26 Taiho Kogyo Kk 表面に微細な凹凸を多数有する多孔質な中空メタルの製造法
NL9200350A (nl) * 1992-02-26 1993-09-16 Stork Screens Bv Werkwijze voor het vervaardigen van een metaalschuim en verkregen metaalschuim.
AU1150897A (en) * 1995-12-13 1997-07-03 Robert Baum Method for producing hollow article and article produced thereby
DE19716524C1 (de) * 1997-04-19 1998-08-20 Daimler Benz Aerospace Ag Verfahren zur Herstellung eines Körpers mit einem Hohlraum
US6467526B1 (en) 2000-10-23 2002-10-22 I.B. Goodman Manufacturing Co., Inc. Method of making a jewelry ring in a vertical mold
FR2862551B1 (fr) * 2003-11-21 2006-04-14 Ateca Procede de fabrication de spheres creuses, spheres creuses ainsi obtenues, et dispositif d'absorption des sons les utilisant
US9061900B2 (en) * 2005-12-16 2015-06-23 Bridgestone Corporation Combined use of liquid polymer and polymeric nanoparticles for rubber applications
US8288473B2 (en) 2005-12-19 2012-10-16 Bridgestone Corporation Disk-like nanoparticles
US8697775B2 (en) * 2005-12-20 2014-04-15 Bridgestone Corporation Vulcanizable nanoparticles having a core with a high glass transition temperature
US8877250B2 (en) * 2005-12-20 2014-11-04 Bridgestone Corporation Hollow nano-particles and method thereof
JP6096398B2 (ja) * 2006-07-28 2017-03-15 株式会社ブリヂストン 重合体ナノ粒子、ゴム組成物及び使用
US7597959B2 (en) * 2006-12-19 2009-10-06 Bridgestone Corporation Core-shell fluorescent nanoparticles
US7829624B2 (en) * 2007-06-29 2010-11-09 Bridgestone Corporation One-pot synthesis of nanoparticles and liquid polymer for rubber applications
US8846819B2 (en) 2008-12-31 2014-09-30 Bridgestone Corporation Core-first nanoparticle formation process, nanoparticle, and composition
US9062144B2 (en) 2009-04-03 2015-06-23 Bridgestone Corporation Hairy polymeric nanoparticles with first and second shell block polymer arms
US20110172364A1 (en) * 2009-12-29 2011-07-14 Chen Yaohong Charged Nanoparticles And Method Of Controlling Charge
US9115222B2 (en) * 2009-12-29 2015-08-25 Bridgestone Corporation Well defined, highly crosslinked nanoparticles and method for making same
GB2491414B (en) * 2011-06-03 2017-11-01 Acell Ind Ltd Composite Open-Cell Foam Insulating Panels
US9428604B1 (en) 2011-12-30 2016-08-30 Bridgestone Corporation Nanoparticle fillers and methods of mixing into elastomers

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FR351060A (fr) * 1905-01-27 1905-07-03 Fred Anton Voelke Mode de fabrication d'objets creux sans soudure

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FR1311777A (fr) * 1961-04-28 1962-12-14 Le Ministre Des Armees Directi Méthode pour la fabrication de corps creux à paroi d'épaisseur constante
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JPS5935696A (ja) * 1982-08-20 1984-02-27 Sanyo Electric Co Ltd ニツケル多孔体の製造方法
JPS5935695A (ja) * 1982-08-20 1984-02-27 Sanyo Electric Co Ltd ニツケル多孔体の製造方法

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FR351060A (fr) * 1905-01-27 1905-07-03 Fred Anton Voelke Mode de fabrication d'objets creux sans soudure

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2672652A1 (fr) * 1991-02-12 1992-08-14 Lacroix E Tous Artifices Systeme d'amortissement notamment pour systemes d'arme.
EP0499526A1 (de) * 1991-02-12 1992-08-19 Etienne Lacroix - Tous Artifices Sa Dämpfungssystem, insbesondere für Waffensysteme
EP0794341A1 (de) * 1996-03-06 1997-09-10 Skf Gmbh Lagerung von Rollen

Also Published As

Publication number Publication date
FR2585373B1 (fr) 1990-05-04
DE3663153D1 (en) 1989-06-08
ATE42774T1 (de) 1989-05-15
FR2585373A1 (fr) 1987-01-30
US4722770A (en) 1988-02-02
EP0212712B1 (de) 1989-05-03
JPS6286190A (ja) 1987-04-20
JPH0776435B2 (ja) 1995-08-16

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