[go: up one dir, main page]

EP0666783B2 - Materiau particulaire d'alimentation pour moulage par injection - Google Patents

Materiau particulaire d'alimentation pour moulage par injection Download PDF

Info

Publication number
EP0666783B2
EP0666783B2 EP93918800A EP93918800A EP0666783B2 EP 0666783 B2 EP0666783 B2 EP 0666783B2 EP 93918800 A EP93918800 A EP 93918800A EP 93918800 A EP93918800 A EP 93918800A EP 0666783 B2 EP0666783 B2 EP 0666783B2
Authority
EP
European Patent Office
Prior art keywords
particles
particulate material
alloy
largest dimension
range
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.)
Expired - Lifetime
Application number
EP93918800A
Other languages
German (de)
English (en)
Other versions
EP0666783B1 (fr
EP0666783A4 (fr
EP0666783A1 (fr
Inventor
Anthony R. Kjar
Ronald G. Iacocca
Randall M. German
John Louis Mihelich
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.)
Thixomat Inc
Original Assignee
Thixomat Inc
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25644329&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0666783(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Thixomat Inc filed Critical Thixomat Inc
Priority to EP99201696A priority Critical patent/EP0960673B1/fr
Publication of EP0666783A1 publication Critical patent/EP0666783A1/fr
Publication of EP0666783A4 publication Critical patent/EP0666783A4/fr
Publication of EP0666783B1 publication Critical patent/EP0666783B1/fr
Application granted granted Critical
Publication of EP0666783B2 publication Critical patent/EP0666783B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/007—Semi-solid pressure die casting
    • 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
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/05—Metallic powder characterised by the size or surface area of the particles
    • 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
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/06—Metallic powder characterised by the shape of the particles
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/16—Remelting metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/12—Making non-ferrous alloys by processing in a semi-solid state, e.g. holding the alloy in the solid-liquid phase
    • 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

Definitions

  • the present invention relates to the injection moulding or casting of thixotropic alloys.
  • composite or “alloy composite” include an alloy matrix having ceramic reinforcement, and includes metal matrix composites.
  • the semi-solid processing of alloys and composites is an area of technology in which much interest is presently being shown. Such processing generally requires the formation of a thixotropic alloy which is subsequently processed. Thixotropic alloys are produced when solid particles of a metal or alloy are homogeneously suspended in a liquid phase of molten metal. The semi-solid mass thus produced has thixotropic rheology.
  • Thixotropic alloys may be processed to produce metal articles by injection moulding.
  • United States 4,694,882 describes a similar process, except that the feed alloy particles are heated to a temperature between the solidus and liquidus temperatures, without complete melting of the feed metal particles taking place.
  • compositions for use in impact extruding comprise aluminium or magnesium alloys in particulate form wherein at least about 1/3 of the particles have a ratio of the longest to shortest dimension of at least about 2.
  • the particles are flat chips or platelets having a high aspect ratio.
  • the present inventors have now developed particles of metal alloys and composites that are particularly suitable for use in producing thixotropic alloys and in the injection moulding of such alloys.
  • the present invention provides a method for producing a thixotropic alloy comprising: providing a particulate material comprising particles of a metal alloy or composite, wherein said particulate material has a tap density of at least 50% of the theoretical density, and wherein a portion of said particles is shaped such that each of said particles in said portion has a ratio of the length of its largest dimension to its effective diameter in the range of 1.2 to 4.0 and has a largest dimension in the range of 0.5 to 5 mm, and wherein said portion of said particles comprise at least 40% by weight of said particulate material; heating the particulate material and shearing the particulate material, thereby producing a substantially homogenous mixture of solid particles and liquid.
  • the particles in said portion of the particulate material are shaped such that the ratio of the length of the largest dimension of a particle to the effective diameter of the particle is in the range of 1.2 to 3.0, more preferably 1.2 to 2.0.
  • the ratio of the length of the largest dimension of a particle to the effective diameter of the particle will be denoted by the term "aspect ratio”.
  • the effective diameter of a particle may be determined by determining the smallest circle that the particle will be able to pass through. The diameter of this circle is the effective diameter of the particle.
  • the particles in said portion have a largest dimension in the range of 1 to 3 mm.
  • the particles are shaped such that the tap density of the mass of particles is at least 50% of the theoretical density of the alloy or composite.
  • the particles preferably have a substantially smooth surface texture.
  • the particles in said portion comprise at least 40% by weight of the mass of particles, preferably at least 60% by weight, more preferably at least 80% by weight, most preferably at least 95% by weight of the mass of particles.
  • the particles preferably have an approximately ovoid shape.
  • Such particles may also be described as having a shape similar to a rugby football or as being the shape formed by the solid of revolution of an ellipse or generally elliptical shape about a longitudinal axis.
  • the particles may have a generally tear drop shaped profile or have a profile that may be described as a flattened tear drop.
  • a first end of the particle in a longitudinal cross-section of a particle, a first end of the particle will have a generally hemispherical or hemi-ovoidal shaped portion.
  • the generally hemispherical or hemi-ovoidal shaped portion may be flattened, usually at a leading edge thereof. This portion will taper to a second end of the particle, where the particle will terminate at a point or at a portion having a small radius of curvature.
  • the overall shape of the particle may be considered to be formed generally as the solid of revolution of the planar shape of the cross-section profile.
  • the particle should have a substantially smooth surface texture, it will be appreciated that the particles will have a small degree of surface roughness (as will the football shaped particles).
  • the thixotropic condition may be produced by any suitable process that involves heating and shearing the particles.
  • the thixotropic condition is produced by use of a screw extruder apparatus.
  • the feed particles may be supplied to a screw extruder whereupon they enter a first heating zone and are heated to a temperature above the melting point of the alloy or composite.
  • the molten material may then pass to a second zone where the molten metal is cooled to a temperature below the liquidus temperature and above the solidus temperature. Solidification of some of the material will occur to form a mixture of solid particles and liquid.
  • the screw of the extruder is caused to rotate such that the mixture is sheared to prevent the formation of large crystal structures and a thixotropic material is formed.
  • the feed particles may be heated in a first zone of the screw extruder to a temperature above the solidus temperature of the material but below the liquidus temperature of the material. Shear is applied to the resulting mixture of liquid and solid particles by rotation of the screw of the extruder to produce the thixotropic material.
  • the method of the present invention is not restricted to use of a screw extruder, but that any means that is capable of heating the feed particles to the required temperature and supplying a shearing force to the mixture of liquid metal and solid particles may be used.
  • the mixture may be subjected to the action of a rotating plate or it may be forced to travel through a tortuous path extruder in order to impart sufficient shearing force to the mixture to produce the thixotropic material.
  • electromagnetic stirring may be used to obtain the thixotropic material.
  • the feed particles may be supplied from a hopper by gravity feed or conveyor feed.
  • the thixotropic material formed by the method of the invention is especially suitable for use in the production of metal components by injection moulding.
  • the present invention also provides a method for producing an article, comprising: heating and shearing a particulate material according to the present invention thereby producing a substantially homogenous mixture of solid particles and liquid; injecting the mixture into a mould; allowing the mixture to at least partially solidify in the mould; and removing the article from the mould.
  • the particles used in the method of the present invention may be of any required metal alloy or composite thereof Some suitable materials include metal and intermetallic alloys based on lead, aluminium, zinc, magnesium, copper and iron. The preferred particles are alloys of aluminium.
  • a substantial proportion of the particles of the particulate material used in the method of the present invention have an approximately ovoid particle shape with a ratio of the largest dimension to the effective diameter of between 1.2 and 3.0, more preferably 1.2 to 2.0. This ratio may be designated the aspect ratio of the particles.
  • These particles can be further characterised as being in the shape of an elongated sphere or shaped like a rugby ball.
  • a preferred shape of the particles is shown schematically in Figure 1.
  • the aspect ratio for the particles is determined from the ratio of length to effective diameter for the particles.
  • L/D 1.2 to 4.0, preferably 1.2 - 3.0, more preferably 1.2 - 2.0
  • the dimension L lies within the range of 0.5 to 5mm.
  • Figure 2 shows a scanning election micrograph of actual particles that are generally ovoid shape.
  • the particles may also be described as of generally cylindrical shape and having rounded ends.
  • the particles have a generally tear drop shape that may be flattened at one end.
  • particle 20 of generally flattened tear drop shape has a first end 21 that is in the form of a generally hemispherical or hemi-ovoidal shape.
  • First end 21 may be flattened at leading edge 22.
  • Particle 20 is shaped such that first end 21 tapers towards second end 23.
  • Second end 23 terminates at a point or at a portion 24 having a small curvature of radius.
  • Figure 3 shows a cross-sectional view of particle 20.
  • the overall shape of the particle may be considered to be in the form of a solid of revolution of the cross-section about longitudinal axis 25.
  • the aspect ratio of particle 20 falls within the range of 1.0 to 4.0, preferably 1.2 to 3.0, more preferably 1.2 to 2.0.
  • the aspect ratio of particle 20 is given by the ratio UD.
  • dimension L may be considered to be the maximum height of the particle.
  • Dimension D is the diameter of the smallest circle that the particle is able to pass through.
  • the particulate matter used in the method of the present invention should include a substantial proportion of particles shaped according to the embodiments described above.
  • a substantial proportion of irregularly shaped particles are also formed and become included in the particulate matter.
  • the presence of such irregularly shaped particles does not unduly affect the properties of the particulate matter unless the irregularly shaped particles are present in an unacceptably large amount.
  • At least 40% by weight of the mass of feed particles are sized such that the overall length of the particles is in the range of 0.5 to 5 mm, preferably 1 to 3 mm. This allows convenient handling of the particles whilst also avoiding binding or clogging of the screw, in the case where a screw extruder is used.
  • the particulate material used in the method of the present invention has a combination of properties that is not found in any metallic particulates currently known to the applicants and these combination of properties make the particulates especially suitable for use as feedstock in thixomolding processes.
  • the particulate material of the invention has a tap density that is at least 50% of the theoretical density. This ensures good particle to particle contact and allows adequate heat transfer rates to be achieved in the heating zone. This allows for relatively short heating times to be used to cause the initial melting or partial melting of the particles and it also allows for close control over temperature to be. maintained to enable the thixotropic state to be maintained.
  • the particulate material is relatively free flowing and will be unlikely to block a feed hopper.
  • the mixing torque required to turn the screw when the particulate material fills a screw extruder is not unacceptably high and the particles are sufficiently large to ensure that particles cannot slip between the walls of the extruder and the screw to cause binding of the screw.
  • the properties of a group of particulate materials were determined in order to compare them with the properties of the mass of particles used in the method of the present invention.
  • the particles used for comparison purposes were made of aluminium and consisted of powder (100 ⁇ m), needles, granules and irregular shaped machining chips. Although some of these particles showed properties in one category that were superior to the properties of the particles of the invention in that category, none of the comparative particles had a combination of properties that were as desirable or useful as the properties of the particulate matter of the invention.
  • the particulate material used in the method of the present invention may be mixed with particles of other shapes and sizes. However, this is generally not preferred due to possible problems associated with segregation and settling of the resultant mixture.
  • the spherical powder provides the best performance in two of the three categories. However, the powder seized between the screw and the wall of the torque measuring device and it is likely that this will also occur in thixomolding apparatus. Accordingly, the spherical powder is unsuitable as a feedstock for thixomolding.
  • the particulate matter of the present invention is the most suitable for use as a feedstock for thixomolding processes.
  • Granule type #1 The particles that fall within the scope of the present invention have been denoted as “granule type #1” and “granule type #2".
  • the summary of the granule dimensions is given in Table 3. TABLE 3 Summary of Granule Dimensions Granule Type (sample number) Length (mm) Width (mm) Aspect Ratio Average Std. Dev. Average Std. Dev. Type #1 (158) 3.55 1.39 2.46 0.74 1.41 Type #2 (189) 3.99 1.35 2.90 0.78 1.36
  • Particle size analysis of granule type #1 and granule type #2 was carried out and the results of this particle size analysis, given as percentage frequency distribution of aspect ratio, percentage frequency distribution of the dimension "length” and percentage frequency distribution of the dimension "width” (diameter), for granule type #1 and granule type #2, are shown in Figures 5 to 10.
  • the granules were produced from an A1 7% Si alloy.
  • Granule types #1 and #2 were found to be free flowing as no mixing torque could be measured. In addition, the granules transported easily along the barrel of the torque measuring device. The granules were found to have an apparent density of from 56-58% of the theoretical apparent density and a tap density of 69% of the theoretical tap density.
  • samples of particles comprising mainly needles were obtained. All of the needles caused seizing of the screw during moulding screw simulation. The apparent density of the needles ranged from 39 to 45% of the theoretical value and the top density ranged from 50 to 59% of the theoretical value.
  • the needles were of a similar aluminium alloy as the granule types #1 and #2.
  • Aluminium alloys are expected to be a difficult feedstock for thixomolding processes because at about 400°C, aluminium-containing particles stick to each other. This particle adhesion would tend to produce blockages in the feed screw of a thixomolding apparatus.
  • FIG. 11 and 12 show photomicrographs of the slurries obtained using granule types 1 at 575°C and 590°C respectively.
  • Figures 13 and 14 show similar photomicrographs for granule types 2.
  • the slurries were obtained by heating the granules up from room temperature to a temperature between the solidus and liquidus of the alloy.
  • the photomicrographs clearly show solid particles surrounded by regions of solidified liquid.
  • a fair amount of porosity is also present, which is due to the stirring arrangement used in the crucible experiments. The porosity is not expected to be present when a thixomolding apparatus is used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Nanotechnology (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Des particules d'alliage et de composites métalliques ont été développées. Elles sont particulièrement utiles dans la production d'alliages thixotropes et dans le moulage par injection de tels alliages. Le matériau particulaire comprend des particules d'alliage ou de composite métallique dans lesquels une proportion substantielle de particules est mise en forme de sorte que le rapport de longueur entre la plus grande dimension de la particule et son diamètre effectif soit de l'ordre de 1,0 à 4,0 et la proportion substantielle de particules possède une dimension de sorte que la plus grande dimension des particules se situe entre 0,5 et 5,0 mm. Ceci permet un traitement adéquat des particules tout en évitant l'agglutination ou l'obstruction de la vis, dans le cas où une extrudeuse à vis est utilisée.

Claims (13)

  1. Procédé pour produire un alliage thixotrope, comprenant : la fourniture d'un matériau particulaire comprenant des particules d'un alliage ou composite métallique, dans lequel ledit matériau particulaire a une masse volumique après tassement d'au moins 50 % de la masse volumique théorique, et dans lequel une partie desdites particules est conformée de sorte que chacune desdites particules dans ladite partie a un rapport de la longueur de sa plus grande dimension à son diamètre effectif dans la gamme de 1,2 à 4,0 et a la plus grande dimension dans la gamme de 0,5 à 5 mm, et dans lequel ladite partie desdites particules représente au moins 40 % en poids dudit matériau particulaire; le chauffage du matériau particulaire et le cisaillement du matériau particulaire, produisant ainsi un mélange de particules solides et de liquide essentiellement homogène.
  2. Procédé selon la revendication 1, dans lequel chacune desdites particules dans ladite partie a un rapport de la longueur de sa plus grande dimension à son diamètre effectif dans la gamme de 1,2 à 3,0.
  3. Procédé selon la revendication 1, dans lequel chacune desdites particules dans ladite partie a un rapport de sa plus grande dimension à son diamètre effectif dans la gamme de 1,2 à 2,0.
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel chacune desdites particules dans ladite partie a la dimension la plus grande dans la gamme de 1 à 3 mm.
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel certaines desdites particules dans ladite partie ont une forme approximativement ovoïde.
  6. Procédé selon l'une quelconque des revendications précédentes, dans lequel lesdites particules dans ladite partie ont un profil général en forme de larme ou un profil général en forme de larme aplatie.
  7. Procédé selon l'une quelconque des revendications précédentes, dans lequel lesdites particules ont une texture de surface substantiellement lisse.
  8. Procédé selon l'une quelconque des revendications précédentes, dans lequel lesdites particules comprennent un alliage d'aluminium ou un composite d'aluminium.
  9. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'alliage thixotrope est produit en utilisant une extrudeuse à vis.
  10. Procédé selon la revendication 9, dans lequel ladite étape de chauffage comprend le chauffage du matériau particulaire dans une première zone à une température supérieure au point de fusion du matériau particulaire, formant ainsi un matériau fondu, et le refroidissement du matériau fondu dans une seconde zone à une température inférieure à la température liquidus mais supérieure à la température solidus du matériau particulaire, et ladite étape de cisaillement comprend la rotation de l'extrudeuse à vis dans la seconde zone, ce qui empêche la formation de grandes structures cristallines dans le matériau fondu.
  11. Procédé selon la revendication 9, dans lequel ladite étape de chauffage comprend le chauffage du matériau particulaire à une température supérieure à la température solidus mais inférieure à la température liquidus du matériau particulaire pour former un mélange, et ladite étape de cisaillement comprend la rotation de l'extrudeuse à vis, ce qui empêche la formation de grandes structures cristallines dans le matériau fondu.
  12. Procédé selon l'une quelconque des revendications 1 à 8, dans lequel l'alliage thixotrope est produit en utilisant l'un quelconque parmi une plaque rotative, une extrudeuse à trajet sinueux et un agitateur électromagnétique.
  13. Procédé pour produire un article, comprenant les étapes consistant à chauffer et cisailler un matériau particulaire par un procédé selon l'une quelconque des revendications 1 à 12, pour produire un mélange de particules solides et de liquide essentiellement homogène, à injecter le mélange dans un moule, à laisser le mélange solidifier au moins partiellement dans le moule et à enlever l'article du moule.
EP93918800A 1992-09-11 1993-09-06 Materiau particulaire d'alimentation pour moulage par injection Expired - Lifetime EP0666783B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99201696A EP0960673B1 (fr) 1992-09-11 1993-09-06 Materiau particulaire d'alimentation pour moulage par injection

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
AUPL463692 1992-09-11
AUPL4636/92 1992-09-11
AUPL463692 1992-09-11
AUPL968093 1993-06-29
AUPL9680/93 1993-06-29
AUPL968093 1993-06-29
PCT/AU1993/000454 WO1994006586A1 (fr) 1992-09-11 1993-09-06 Materiau particulaire d'alimentation pour moulage par injection

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP99201696A Division EP0960673B1 (fr) 1992-09-11 1993-09-06 Materiau particulaire d'alimentation pour moulage par injection

Publications (4)

Publication Number Publication Date
EP0666783A1 EP0666783A1 (fr) 1995-08-16
EP0666783A4 EP0666783A4 (fr) 1997-07-02
EP0666783B1 EP0666783B1 (fr) 2000-04-12
EP0666783B2 true EP0666783B2 (fr) 2006-03-15

Family

ID=25644329

Family Applications (2)

Application Number Title Priority Date Filing Date
EP99201696A Expired - Lifetime EP0960673B1 (fr) 1992-09-11 1993-09-06 Materiau particulaire d'alimentation pour moulage par injection
EP93918800A Expired - Lifetime EP0666783B2 (fr) 1992-09-11 1993-09-06 Materiau particulaire d'alimentation pour moulage par injection

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP99201696A Expired - Lifetime EP0960673B1 (fr) 1992-09-11 1993-09-06 Materiau particulaire d'alimentation pour moulage par injection

Country Status (8)

Country Link
EP (2) EP0960673B1 (fr)
JP (1) JP3497167B2 (fr)
BR (1) BR9307038A (fr)
CA (1) CA2144434A1 (fr)
DE (2) DE69333841D1 (fr)
IL (1) IL106986A (fr)
MX (1) MX9305588A (fr)
WO (1) WO1994006586A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5501266A (en) * 1994-06-14 1996-03-26 Cornell Research Foundation, Inc. Method and apparatus for injection molding of semi-solid metals
DE19910365C1 (de) * 1999-03-09 2000-09-07 Fraunhofer Ges Forschung Verfahren zur Herstellung von Preßlingen als Zwischenprodukt für die Fertigung von endformnahen Bauteilen sowie derartige Preßlinge
ATE320874T1 (de) * 2001-10-16 2006-04-15 Phillips Plastics Corp Herstellung von ausgangsmaterial zur verformung in halbfestem zustand
DE10312772A1 (de) * 2003-03-23 2004-11-11 Menges, Georg, Prof. Dr.-Ing. Verarbeitung metallischer Legierungen in einem Druckgieß- oder Spritzgießverfahren
DE10317762B4 (de) * 2003-04-17 2006-01-05 Krauss-Maffei Kunststofftechnik Gmbh Vorrichtung und Verfahren zur Erzeugung und Verarbeitung von metallischer Schmelze

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1758656A1 (de) * 1968-07-15 1971-04-15 Dow Chemical Co Kaltspritzverfahren
US3881913A (en) * 1974-02-19 1975-05-06 Ivan Andreevich Barannik Method of producing granules of magnesium and its alloys
US4063942A (en) * 1974-11-26 1977-12-20 Skf Nova Ab Metal flake product suited for the production of metal powder for powder metallurgical purposes, and a process for manufacturing the product
US4694882A (en) * 1981-12-01 1987-09-22 The Dow Chemical Company Method for making thixotropic materials
US4694881A (en) * 1981-12-01 1987-09-22 The Dow Chemical Company Method for making thixotropic materials
US4460407A (en) * 1982-12-20 1984-07-17 The Dow Chemical Company Method of preparing magnesium alloy particles
JPS60114508A (ja) * 1983-11-25 1985-06-21 Mitsubishi Metal Corp 球状金属粒の製造方法
DE3639737A1 (de) * 1986-11-21 1988-06-01 Siemens Ag Verfahren zum umformen von schmelzfaehigen metallen
US4755353A (en) * 1987-04-03 1988-07-05 Gte Products Corporation Process for producing metal foils
US5040589A (en) * 1989-02-10 1991-08-20 The Dow Chemical Company Method and apparatus for the injection molding of metal alloys

Also Published As

Publication number Publication date
MX9305588A (es) 1994-05-31
IL106986A0 (en) 1993-12-28
JP3497167B2 (ja) 2004-02-16
DE69328374D1 (de) 2000-05-18
JPH08501128A (ja) 1996-02-06
DE69333841D1 (de) 2005-08-18
EP0666783B1 (fr) 2000-04-12
EP0960673B1 (fr) 2005-07-13
EP0666783A4 (fr) 1997-07-02
EP0960673A1 (fr) 1999-12-01
WO1994006586A1 (fr) 1994-03-31
BR9307038A (pt) 1999-08-24
EP0666783A1 (fr) 1995-08-16
CA2144434A1 (fr) 1994-03-31
IL106986A (en) 1997-08-14
DE69328374T2 (de) 2000-08-10

Similar Documents

Publication Publication Date Title
US5577546A (en) Particulate feedstock for metal injection molding
US4473103A (en) Continuous production of metal alloy composites
US7837811B2 (en) Method for manufacturing a composite of carbon nanomaterial and metallic material
EP0575796B1 (fr) Procédé de fabrication d'alliages de magnésium thixotropiques
Pai et al. Production of cast aluminium-graphite particle composites using a pellet method
EP0095597A2 (fr) Procédé pour la fabrication d'une masse métallique thixotrope
CN109013728B (zh) 一种固液混合连续挤压制备高合金材料的方法及装置
KR910006069B1 (ko) 섬유강화 알루미늄 복합 주조체의 제조법
EP0666783B2 (fr) Materiau particulaire d'alimentation pour moulage par injection
RU2567779C1 (ru) Способ получения модифицированных алюминиевых сплавов
EP1196644A1 (fr) Charge d'alimentation activee
AU677601B2 (en) Particulate feedstock for metal injection molding
US4557605A (en) Apparatus for the continuous production of metal alloy composites
JPS599601B2 (ja) 金属および合金粒状物の製造方法
JPH0550211A (ja) 半凝固金属の成形方法
US3849123A (en) Incorporation of solid additives into molten aluminum
Qiu et al. Mould filling behaviour and solidification structure of semi-solid gray iron
JP3220072B2 (ja) 金属射出成形用ペレットの製造方法
EP0482034B1 (fr) Procede de production de materiaux composites renforces et les produits de ce procede
EP0108464B1 (fr) Procédé de fabrication de granules de magnésium revêtues d'une couche de sel
JP4726011B2 (ja) 金属基複合材料の製造方法および金属基複合材料部材の製造方法ならびに撹拌装置
US2659137A (en) Composite alloy
JPS61157647A (ja) アルミニウム質強化複合材の製造法
JPS642178B2 (fr)
JPS6410581B2 (fr)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19950308

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT SE

A4 Supplementary search report drawn up and despatched

Effective date: 19970514

AK Designated contracting states

Kind code of ref document: A4

Designated state(s): DE FR GB IT SE

17Q First examination report despatched

Effective date: 19971202

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: THIXOMAT, INC.

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT SE

REF Corresponds to:

Ref document number: 69328374

Country of ref document: DE

Date of ref document: 20000518

ET Fr: translation filed
ITF It: translation for a ep patent filed
PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

PLAV Examination of admissibility of opposition

Free format text: ORIGINAL CODE: EPIDOS OPEX

PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

26 Opposition filed

Opponent name: CHUO-KOSAN CO. LTD.

Effective date: 20010111

Opponent name: NORSK HYDRO A.S.

Effective date: 20010112

Opponent name: MANNESMANN PLASTICS MACHINERY AG

Effective date: 20010111

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

R26 Opposition filed (corrected)

Opponent name: MANNESMANN PLASTICS MACHINERY AG * 20010111 CHUO-K

Effective date: 20010111

R26 Opposition filed (corrected)

Opponent name: MANNESMANN PLASTICS MACHINERY AG * 20010111 CHUO-K

Effective date: 20010111

PLAW Interlocutory decision in opposition

Free format text: ORIGINAL CODE: EPIDOS IDOP

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

APAC Appeal dossier modified

Free format text: ORIGINAL CODE: EPIDOS NOAPO

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20030904

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20030909

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040907

APAA Appeal reference recorded

Free format text: ORIGINAL CODE: EPIDOS REFN

EUG Se: european patent has lapsed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050531

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20050809

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050906

APBU Appeal procedure closed

Free format text: ORIGINAL CODE: EPIDOSNNOA9O

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20050930

Year of fee payment: 13

APAH Appeal reference modified

Free format text: ORIGINAL CODE: EPIDOSCREFNO

PUAH Patent maintained in amended form

Free format text: ORIGINAL CODE: 0009272

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT MAINTAINED AS AMENDED

27A Patent maintained in amended form

Effective date: 20060315

AK Designated contracting states

Kind code of ref document: B2

Designated state(s): DE FR GB IT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060616

EN Fr: translation not filed
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20060906

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060906