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WO1993017820A1 - Procede de retrait des noyaux pendant le moulage par injection d'objets a partir de metaux et/ou de ceramiques a l'etat de poudres - Google Patents

Procede de retrait des noyaux pendant le moulage par injection d'objets a partir de metaux et/ou de ceramiques a l'etat de poudres Download PDF

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Publication number
WO1993017820A1
WO1993017820A1 PCT/SE1993/000181 SE9300181W WO9317820A1 WO 1993017820 A1 WO1993017820 A1 WO 1993017820A1 SE 9300181 W SE9300181 W SE 9300181W WO 9317820 A1 WO9317820 A1 WO 9317820A1
Authority
WO
WIPO (PCT)
Prior art keywords
core
leachable
injection moulding
injection
dissolved
Prior art date
Application number
PCT/SE1993/000181
Other languages
English (en)
Inventor
Signar Danielsson
Erik Karlsson
Hans Larker
Bertil Mattsson
Jan Nilsson
Original Assignee
Abb Cerama Ab
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 Abb Cerama Ab filed Critical Abb Cerama Ab
Publication of WO1993017820A1 publication Critical patent/WO1993017820A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B22F3/1208—Containers or coating used therefor
    • B22F3/1258—Container manufacturing
    • B22F3/1291—Solid insert eliminated after consolidation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B22F3/14—Both compacting and sintering simultaneously
    • B22F3/15—Hot isostatic pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/24—Producing shaped prefabricated articles from the material by injection moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/342—Moulds, cores, or mandrels of special material, e.g. destructible materials which are at least partially destroyed, e.g. broken, molten, before demoulding; Moulding surfaces or spaces shaped by, or in, the ground, or sand or soil, whether bound or not; Cores consisting at least mainly of sand or soil, whether bound or not
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
    • C04B35/632—Organic additives
    • C04B35/634—Polymers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • C04B35/645—Pressure sintering
    • C04B35/6455—Hot isostatic pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F2005/103—Cavity made by removal of insert
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
    • C04B2235/3225—Yttrium oxide or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3272—Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3817—Carbides
    • C04B2235/3826—Silicon carbides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
    • C04B2235/3873—Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/602—Making the green bodies or pre-forms by moulding
    • C04B2235/6022—Injection moulding
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/80—Phases present in the sintered or melt-cast ceramic products other than the main phase
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/94—Products characterised by their shape

Definitions

  • the invention relates to a method of removing a core from an object formed by injection moulding starting from a metallic and/or ceramic powder.
  • the outer contour of the object has been formed against an external mould, arranged in the injection moulding tool used, in the form of an external " tool and the inner contour of the object has been formed against a core arranged in the injection moulding tool.
  • the core comprises parts to which members for handling the core before and in connec ⁇ tion with the injection moulding, as well as for handling the core with the object injection-moulded around the core after the injection moulding, can be applied.
  • the first two requirements are usually fulfilled by a suitable material choice; possibly, a barrier and/or release layer is applied to avoid reaction or adhesion between the injection-moulded object and the core.
  • the core is usually removed mechanically from the formed object by being with ⁇ drawn from the hole.
  • the hole and the core must therefore have such a shape that the core for geometrical reasons can be withdrawn from the formed object after the injection moulding.
  • a composite core in which the different parts can be individually withdrawn from the hole after the forming, can be used.
  • Such leaching, melting or evaporation of the core often takes place before or in connection with driving off organic constituents included in the injection-moulded object, such as binders and/or softeners.
  • the injection-moulded object is sin ⁇ tered and consolidated into the desired density by methods recognized within the powdermetallurgical and ceramic industries.
  • a problem arising when a core is removed by means of leaching, melting or evaporation is that these operations are usually connected with a change in volume, preferably an increase in volume, of the core and/or the compound injection-moulded around the core.
  • An object of the invention is to suggest a method whereby a core can be removed from injection-moulded objects without the inner shape or the dimensions being affected.
  • a ceramic and/or metallic object is formed by injection- moulding a compound which comprises a metallic and/or ceramic powder and, where necessary, softeners, binders and other additives which improve the workability of the compound, increase the green strength of the injection- moulded object, and facilitate the removal from the forming tool, etc.
  • the outer contour of the object is formed against an external tool arranged in the injection moulding tool while at the same time at least the inner contour of one inner cavity is formed against a core arranged in the injection moulding tool.
  • This core which at least partly comprises a leachable core material, is removed after the forming by a treatment whereby the leachable core material is dissolved and removed from the injection-moulded object without the object or the inner contour being deformed.
  • the core is removed from the injection-moulded object by directing at least one jet of a leaching liquid against the leachable core material by means of one or more spray nozzles, whereby the leachable core material is dissolved and flushed away, successively inserting the spray nozzle into the inner cavity according as the leachable core material is being dissolved and flushed away such that the inner cavity is exposed.
  • the leachable core material is flushed away by the flushing leaching liquid, its volume cannot change.
  • the contact time of the injection-moulded object with the leaching liquid is reduced in relation to the con ⁇ tact time in conventional leaching. Since the contact time of the leaching liquid with both the core before the disin ⁇ tegration and with the injection-moulded object is reduced considerably with the method according to the invention for removing cores from injection-moulded objects, the influence and the ensuing deformation of the injection-moulded object or its inner contour, which during normal leaching treatment destroys ceramic and/or metallic materials, is essentially eliminated.
  • the temperature of the injection- moulded part can be maintained below the softening tempe ⁇ rature - Tg for amorphous and Tm for part-crystalline organic materials - of organic constituents included in the injection-moulded object. Therefore, deformations are avoided and parts with a high accuracy of shape can be manufactured.
  • the core is formed around a permanent and stiff core element, preferably a core element in the form of a steel rod.
  • This permanent and stiff core element is preferably arranged with a part which projects from the core, which increases the manageability of the core. This property is further enhanced by arranging part of the core element to project from the core formed around the core element.
  • the possibili ⁇ ties of handling cores in a rational and efficient way are increased when manufacturing objects by means of injection moulding, both before the injection moulding,
  • grippers may be arranged to seize the object by means of the above-mentioned projecting part of the stiff core element, whereby an efficient, well controlled and automated handling of the core and the injection-moulded object from the forming of the core to the removal of the core from the injection-moulded object is made possible by making use of the invention.
  • a core is formed which at least partly comprises an organic polymer material.
  • the core is inserted into an injection moulding tool and after an object has been formed by injection moulding in the tool, the organic polymer material is dissolved and the disinte ⁇ grated core is flushed away in the manner described above by means of a leaching liquid, flushing through the above- mentioned nozzles, in the form of a suitable solvent.
  • a core is formed which comprises a water soluble material, such as a water soluble resin or another water soluble organic polymer material, a salt or a water soluble silicate binder.
  • the core is inserted into an injection moulding tool and after an object has been formed by injection moulding in the tool, the core is removed from the injection-moulded object in the manner described above by supplying water through nozzles to dissolve the water soluble core material and flush away at least part of the disintegrated core.
  • the above-mentioned leachable or in certain cases -water soluble core material is, in one embodiment of the inven ⁇ tion, a binder which binds a core formed from a coarse ⁇ grained, preferably spherical powder.
  • the core is inserted into an injection moulding tool and after an object has been formed by injection moulding in the tool, the core is removed from the in ection-moulded object in the manner described above by dissolving the leachable binder by the flushing leaching liquid which is supplied through nozzles and which also at least partially flushes away the core disintegrated into a coarse-grained powder.
  • the injection- moulded object is sintered and consolidated by hot-isostatic pressing in a high-pressure furnace. If this hot-isostatic pressing is carried out according to a method in which the injection-moulded object in connection with consolidation and sintering is enclosed in a layer of glass which is impenetrable to the pressure medium, the core can advan- tageously be made from a glass powder and a leachable binder. The binder is leached and removed in the manner described above, whereupon the glass powder is enclosed in the glass enclosure used during the hot-isostatic pressing.
  • Figures 1 and 2 show two examples of objects which are injection-moulded around a core according to the inven ⁇ tion.
  • the figures show a stiff core element with projecting portions for fixing and handling the core ' and the object formed during forming around the core.
  • the injection-moulded objects shown in the figures also comprise casting gates, for distributing the injected compound, which are removed in operations following the forming operation.
  • a core 11 was formed starting from a spherical glass powder with a grain size of 125 to 25 ⁇ m bonded by a water soluble resin such as a polyvinyl acetate resin. The resin was added in a content of 5.9 per cent by weight.
  • the core was formed around a stiff core element 12 in the form of a steel bar. The core was formed with projecting parts 15 and the steel bar 12 was arranged with parts 16 projecting from the formed core 11.
  • a compound consisting of a ceramic powder in the form of a mixture with the composition 30 per cent by weight silicon carbide, 2 per cent by weight yttrium oxide and 68 per cent by weight silicon nitride suspended in a polymer mixture was injected into the injection moulding tool.
  • the polymer mix ⁇ ture with a softening temperature exceeding 70°C comprised polyethylene and polypropylene and was added in a content of 16.0 per cent by weight to the compound injected.
  • the binder was dissolved in the core 11 by supplying flushing hot, 40-60°C, water through nozzles and directing it towards the water soluble parts of the core. As the water soluble parts of the core were dissolved, nozzles were successively inserted further and further into the cavity. After that, the steel bar 12 was removed whereas the glass powder, at least partly, was allowed to remain in the cavity.
  • the injection-moulded ceramic object was then transferred to a further where it was heated under vacuum to a temperature of about 600°C in order to drive off the polymer mixture added to the ceramic powder and volatile residues of the core material.
  • the rotor 13 was enclosed in a glass enclosure, comprising glass powder remaining from the core material, sintered and consolidated by hot-isostatic pressing at 1750°C and 150 MPa for 2 hours, after which the glass enclosure was removed. Finally, the rotor 13 was cleaned by blasting.
  • a core 21 was formed by injection moulding of a water , soluble resin such as a polyvinyl acetate resin around a stiff core element 22 in the form of a steel bar.
  • the steel bar 22 was arranged with a part 26 projecting from the formed core 21, whereby the insertion of the core 21 into an injection moulding tool (not shown) , intended for forming of the pipe tee, was facilitated.
  • a compound consisting of a silicon nitride powder suspended in a polymer mixture was injected into the injection moulding tool.
  • the silicon nitride 2.5 per cent by weight Y 2 O 3 and 0.5 per cent by weight Fe 2 ⁇ 3 had been added.
  • the polymer mixture comprised polyethylene and polypropylene and was added in a content of 16.3 per cent by weigh to the compound injected.
  • the core 21 was removed by supplying flushing hot, 40-60°C, water through nozzles and directing it towards the water soluble parts of the core. As the water soluble parts of the core were dissolved and removed, nozzles were successively inserted further and further into the cavity.
  • the pipe tee 23 was enclosed in a glass enclosure, comprising a water soluble glass, was sintered and consolidated by hot-isostatic pressing at 1750°C and 150 MPa for 2 hours. After the hot-isostatic pressing the glass enclosure was removed by leaching in water. Finally, the pipe tee 23 was cleaned by blasting.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Producing Shaped Articles From Materials (AREA)

Abstract

Procédé pour retirer le noyau se trouvant dans un objet fabriqué par moulage par injection partant d'un composé comprenant un matériau à base de poudre métallique et/ou céramique. Le contour extérieur de l'objet prend forme contre un outil externe placé dans un moule à injection et le contour intérieur d'une cavité interne au moins prend forme contre un noyau (11, 21) placé dans ce moule à injection. Ce noyau consiste au moins partiellement en un matériau lessivable que l'on retire entièrement ou partiellement de l'objet moulé par injection en dirigeant au moins un jet d'un liquide de lessivage sur ledit matériau grâce à une ou plusieurs buses de pulvérisation. Ce matériau lessivable constituant le noyau se dissout et s'évacue et l'on enfonce progressivement la buse dans la cavité interne au fur et à mesure. On retire ainsi l'intégralité du noyau et on dégage la cavité interne avant de fritter l'objet et de le porter à la densité voulue par des procédés acceptés dans les industries des poudres métalliques et céramiques.
PCT/SE1993/000181 1992-03-05 1993-03-02 Procede de retrait des noyaux pendant le moulage par injection d'objets a partir de metaux et/ou de ceramiques a l'etat de poudres WO1993017820A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9200670A SE9200670D0 (sv) 1992-03-05 1992-03-05 Saett vid formsprutning av foeremaal utgaaende fraan metalliska och/eller keramiska material i pulverform
SE9200670-9 1992-03-05

Publications (1)

Publication Number Publication Date
WO1993017820A1 true WO1993017820A1 (fr) 1993-09-16

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PCT/SE1993/000181 WO1993017820A1 (fr) 1992-03-05 1993-03-02 Procede de retrait des noyaux pendant le moulage par injection d'objets a partir de metaux et/ou de ceramiques a l'etat de poudres

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SE (1) SE9200670D0 (fr)
WO (1) WO1993017820A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001060581A1 (fr) * 2000-02-17 2001-08-23 Cerabio, Llc Moulage par injection a inserts sacrificiels
EP1184108A3 (fr) * 2000-09-05 2003-07-23 Advanced Materials Technologies, Pte Ltd. Articles de forme nette à espaces creux complexes internes
WO2005049251A1 (fr) * 2003-11-21 2005-06-02 Metso Powdermet Oy Procede de fabrication de canaux internes dans un composant
DE10314277B4 (de) * 2002-11-14 2006-07-27 Mimtechnik Gmbh Verfahren zur Herstellung eines gesinterten Metall und/oder Keramikbauteiles
US7332123B2 (en) * 2002-12-27 2008-02-19 General Electric Company Method for manufacturing composite articles and the articles obtained therefrom
EP1992415A3 (fr) * 2007-05-15 2010-01-27 Lechler GmbH Buse haute pression et procédé de fabrication d'une buse haute pression
WO2010068169A1 (fr) * 2008-12-11 2010-06-17 Seco Tools Ab Procédé de fabrication de produits en carbure cémenté
WO2010076012A1 (fr) * 2009-01-02 2010-07-08 Boehringer Ingelheim International Gmbh Composant et inhalateur ainsi que procédé de fabrication d'un composant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE314782B (fr) * 1965-05-24 1969-09-15 Kaiser Aluminium Chem Corp
US3963818A (en) * 1971-10-29 1976-06-15 Toyo Kogyo Co., Ltd. Water soluble core for pressure die casting and process for making the same
DE2742203A1 (de) * 1977-09-20 1979-03-22 Erhard Dipl Ing Raschke Verfahren zur herstellung rissfreier hohlkoerper aus gepresstem pulvermaterial
DE3144960C2 (de) * 1981-11-12 1984-08-16 Honsel-Werke Ag, 5778 Meschede Kern zur Herstellung von Kanälen in Gußstücken und Verfahren zu seiner Herstellung und Anwendung
US5066454A (en) * 1990-06-20 1991-11-19 Industrial Materials Technology, Inc. Isostatic processing with shrouded melt-away mandrel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE314782B (fr) * 1965-05-24 1969-09-15 Kaiser Aluminium Chem Corp
US3963818A (en) * 1971-10-29 1976-06-15 Toyo Kogyo Co., Ltd. Water soluble core for pressure die casting and process for making the same
DE2742203A1 (de) * 1977-09-20 1979-03-22 Erhard Dipl Ing Raschke Verfahren zur herstellung rissfreier hohlkoerper aus gepresstem pulvermaterial
DE3144960C2 (de) * 1981-11-12 1984-08-16 Honsel-Werke Ag, 5778 Meschede Kern zur Herstellung von Kanälen in Gußstücken und Verfahren zu seiner Herstellung und Anwendung
US5066454A (en) * 1990-06-20 1991-11-19 Industrial Materials Technology, Inc. Isostatic processing with shrouded melt-away mandrel

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001060581A1 (fr) * 2000-02-17 2001-08-23 Cerabio, Llc Moulage par injection a inserts sacrificiels
US6547210B1 (en) 2000-02-17 2003-04-15 Wright Medical Technology, Inc. Sacrificial insert for injection molding
EP1184108A3 (fr) * 2000-09-05 2003-07-23 Advanced Materials Technologies, Pte Ltd. Articles de forme nette à espaces creux complexes internes
US6776955B1 (en) 2000-09-05 2004-08-17 Advanced Materials Technologies, Pte., Ltd. Net shaped articles having complex internal undercut features
DE10314277B4 (de) * 2002-11-14 2006-07-27 Mimtechnik Gmbh Verfahren zur Herstellung eines gesinterten Metall und/oder Keramikbauteiles
US7332123B2 (en) * 2002-12-27 2008-02-19 General Electric Company Method for manufacturing composite articles and the articles obtained therefrom
WO2005049251A1 (fr) * 2003-11-21 2005-06-02 Metso Powdermet Oy Procede de fabrication de canaux internes dans un composant
EP1992415A3 (fr) * 2007-05-15 2010-01-27 Lechler GmbH Buse haute pression et procédé de fabrication d'une buse haute pression
US7841548B2 (en) 2007-05-15 2010-11-30 Lechler Gmbh High pressure nozzle and method for the manufacture of a high pressure nozzle
EP2422883A3 (fr) * 2007-05-15 2013-04-24 Lechler GmbH Procédé de fabrication d'une buse haute pression
WO2010068169A1 (fr) * 2008-12-11 2010-06-17 Seco Tools Ab Procédé de fabrication de produits en carbure cémenté
WO2010076012A1 (fr) * 2009-01-02 2010-07-08 Boehringer Ingelheim International Gmbh Composant et inhalateur ainsi que procédé de fabrication d'un composant

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