EP0554682B1 - Procédé pour la fabrication des surfaces résistantes à l'abrasion - Google Patents

Procédé pour la fabrication des surfaces résistantes à l'abrasion Download PDF

Info

Publication number
EP0554682B1
EP0554682B1 EP93100454A EP93100454A EP0554682B1 EP 0554682 B1 EP0554682 B1 EP 0554682B1 EP 93100454 A EP93100454 A EP 93100454A EP 93100454 A EP93100454 A EP 93100454A EP 0554682 B1 EP0554682 B1 EP 0554682B1
Authority
EP
European Patent Office
Prior art keywords
plate
pegs
wear
casting
metal
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
EP93100454A
Other languages
German (de)
English (en)
Other versions
EP0554682A1 (fr
Inventor
Gopal Subray Revankar
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.)
Deere and Co
Original Assignee
Deere and Co
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 Deere and Co filed Critical Deere and Co
Publication of EP0554682A1 publication Critical patent/EP0554682A1/fr
Application granted granted Critical
Publication of EP0554682B1 publication Critical patent/EP0554682B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
    • 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
    • C22C1/10—Alloys containing non-metals
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
    • Y10T428/12049—Nonmetal component
    • Y10T428/12056—Entirely inorganic
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
    • Y10T428/12063—Nonparticulate metal component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
    • Y10T428/12063—Nonparticulate metal component
    • Y10T428/12139—Nonmetal particles in particulate component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/12028—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, etc.]
    • Y10T428/12146—Nonmetal particles in a component

Definitions

  • the invention relates to a method for impregnating or embedding hard, wear-resistant phases in surface layers of metal products, which are produced by pouring liquid metal, according to the preamble of patent claim 1.
  • metal products for example made of iron
  • the surfaces are coated, for example, by flame spray coating or plasma spray coating.
  • flame spray coating or plasma spray coating a disadvantage of these processes is that the surface layers can flake off during the coating process and when the products are used. There are also high procedural costs.
  • the mechanical properties of cast iron made by an EPC process are inferior to that of sand or core castings due to the presence of carbon defects. Furthermore, the EPC process requires special precautionary measures to keep small changes in shape during casting.
  • the EPC process in a conventional foundry requires the installation of special devices.
  • the cast products can have shape deviations which can be attributed to shape deviations of the foam models.
  • the sand molding method for casting carbides known from the prior art requires carbide balls, which can make the process more expensive. Increased costs can also result from the requirement that the wear-resistant surface be made flat. In this case, the cast product must be smoothed and a surface layer removed, which corresponds approximately to half the diameter of the spherical particles.
  • GB-A-2 074 912 discloses a process for the production of cast iron parts, in particular bogie bolsters for railway carriages, in the surface of which a separate wear plate of high hardness is embedded.
  • the wear plate is made of iron with the addition of carbon, manganese, silicon, chromium and molybdenum. It is attached to a mold before pouring.
  • In order to mechanically anchor the wear plate on the surface of the cast part it has a wedge-shaped configuration on its circumference, which is held in the manner of a dovetail behind the outer surface of the cast part.
  • the aim is to mechanically hook the wear plate with its circumference to the cast part in order to facilitate removal and replacement of worn wear plates.
  • the wear plate with its surface limited by the circumference is not fused to the cast part surface, but only rests on it, it can be cut into strips and removed with a cutting torch.
  • this training is unsuitable for applications in which a permanent anchoring of hard, wear-resistant surfaces on metal products is required and where high dimensional accuracy is also important.
  • the invention provides a remedy here and proposes a method for embedding layers of hard, wear-resistant material in surface layers of metal products which are produced by pouring liquid metal into casting molds.
  • the layers contain protruding pins, anchors or hooks, which consist of the hard, wear-resistant material and through which the wear-resistant layer is "mechanically” attached to the casting surface.
  • the present invention can basically be applied to the casting of any known metal.
  • cast iron especially spheroidal graphite cast iron or gray cast iron
  • suitable metals include non-ferrous alloys and high heat resistance superalloys.
  • a first step involves the formation of a disc or plate made of wear-resistant material.
  • the invention can be used with any sinterable, hard phase known from the prior art.
  • Such hard phases are, for example, tungsten carbide, chromium carbide and the like.
  • the wear-resistant material can be a metallic binder included, the z. B. belongs to the iron group, such as preferably cobalt for use with tungsten carbides or nickel for use with chromium carbides etc. If, for example, ductile iron is used as the metal to be cast, particles are preferred which are made of tungsten carbide with a weight fraction of 14 to 17% cobalt are composed.
  • the disc is produced by mixing a powder made of hard, wear-resistant material (to which a metal binder is preferably added) with a suitable organic binder, for example a 10% polyvinyl alcohol solution (PVA), and a suitable plasticizer, for example 2-ethylhexyl diphenyl Phosphate, phosphate ester plasticizer (e.g. KRONITEX 3600 from FMC Corporation, USA) or a mixture of plasticizers.
  • PVA polyvinyl alcohol solution
  • plasticizer for example 2-ethylhexyl diphenyl Phosphate, phosphate ester plasticizer (e.g. KRONITEX 3600 from FMC Corporation, USA) or a mixture of plasticizers.
  • the mixture forms a flowable mass with suitable rheological properties, so that the mass can be shaped like a disk.
  • any plasticizer and / or organic binder that can be processed effectively with a certain hard, wear-resistant material is suitable.
  • Fine-grained particles having a mesh size of 140/200 (approx. 110 to 74 microns) or finer are preferably used in the process according to the invention.
  • a pattern is then applied to an outwardly facing surface of the pane, the structure of which results in an improvement in the impregnation of the iron.
  • the shape of the pattern on the disc can take any structure that prevents lateral movement of the disc on a component surface during use, that is, the structure is intended to intercept shear forces that act tangentially on the disc surface.
  • a waffle structure is applied to the outer surface of the pane (FIG. 1).
  • the pattern can be molded by suitable means, for example by pressing a stamp on the surface of the still flowable, plastic thin plate, which has the desired pattern.
  • the same mixture of wear-resistant material, organic binder and plasticizer that is used to form the disc is preferably also used to form pins or anchors that are attached to the disc.
  • the pins or anchors can take any shape that enables the disk to be mechanically held on the casting surface. Two examples of suitable pins are shown in FIG. 2 in a side view and in a top view. Other cone shapes can include, for example, flat carbide disks with waffle-like surface textures.
  • These cones are cast separately and then, for example, dried in an oven at approximately 100 ° C., so that dimensionally stable solid bodies are formed. They are glued to the disc, on the side of the disc on which the pattern is to form the wear-resistant layer, as shown, for example, in FIG. 1.
  • the number of pins that are attached to the disc is chosen so that the pins can absorb the separation forces that could be applied to the disc surface without the disc becoming detached.
  • four anchors are provided in the embodiment of FIG. 1.
  • the number can also be e.g. B. vary between 1 and 8.
  • the pins can be attached to the disk. They can also be pre-sintered before fastening. In any case, they become an integral part of the disc as soon as it is sintered together with the pins.
  • the disc is then at low Temperatures of, for example, 320 to 340 ° C heated to remove volatile components of the organic binder and plasticizer.
  • This sintering of unbound disks takes place under conditions in which the disks and pins become completely compact.
  • Such sintering processes are known.
  • sintering can take place in a vacuum at temperatures between 1450 and 1475 ° C. over a period of 50 to 75 minutes.
  • the composition of the pins or anchors preferably coincides with that of the associated disk, the disk with the anchors attached to it is essentially stress-free after cooling from the sintering temperature to room temperature. After sintering, the pins are thus integral components of the associated disks (FIG. 3).
  • binders and plasticizers are used in accordance with the method described above for forming the washers and pins, methods can also be used in which these additives are omitted.
  • the carbide powder with a suitable proportion of metallic binders can be pressed directly into a disc with a flat pin within a cold mold. Such disks can then be sintered in the same manner as described above, with the exception that now neither binders nor plasticizers have to be freed of their volatile components by heating to low temperatures.
  • the sintered wear-resistant layer or disk can now be attached in a known manner on a suitable mold surface, for example that of a sand core.
  • a suitable mold surface for example that of a sand core.
  • for. B. uses a high-temperature adhesive according to an embodiment of the invention.
  • the layer is then, for example heated to 100 ° C. in an oven so that the evaporating constituents are expelled from the adhesive and the adhesive cures.
  • the high-temperature adhesive must have a flow temperature that is higher than the casting temperature of the metal.
  • any adhesive in this regard is suitable, but an inorganic high-temperature adhesive is particularly preferred.
  • a binder which contains a high-temperature ceramic adhesive for. B. a high temperature binder, which is sold by Aremco Products, Inc., USA under the trade name Ceramabond 569 and contains, for example, oxides of aluminum, silicon and potassium in an aqueous colloidal suspension which has a maximum service temperature of approximately 1650 ° C. .
  • the liquid metal penetrates into the pores of the layer made of hard, wear-resistant material.
  • Any of the known casting processes for example casting using gravity, pressure die casting, vacuum casting or the like, can be used. However, gravity-based casting is preferred because of its ease of handling. 3 shows, for example, spheroidal graphite cast iron with tungsten carbide impregnation.
  • the method according to the invention can be used to produce metal products which cover a wide range of applications. Furthermore, the method can be used with a large number of metals and their alloys, since it is not necessary when the method is carried out that the metal is metallurgically coated with the layer of wear-resistant material responds.
  • the mechanical anchoring by the pins is essentially sufficient for fastening.
  • an additional metallurgical reaction has been identified which further strengthens the iron-carbide bond. The formation of this reaction can be improved by forming a waffle pattern on the disk.
  • the surface conversion can already be carried out successfully during the casting process and requires neither subsequent soldering or welding, nor additional casting devices, such as may be associated with a dissolving foam core (EPC process) during casting.
  • the method according to the invention can be used without difficulty in known sand molding processes.
  • Fine tungsten carbide powder with 14 to 17% cobalt powder as a metal binder (mesh size 140/200 or finer) is mixed with a suitable organic binder, for example a 10% aqueous polyvinyl alcohol solution, and a suitable plasticizer (2-ethylhexyl diphenyl phosphate or KRONITEX 3600 from FMC Corporation, USA) or a mixture of plasticizers to form a flowable mass with adequate rheological properties, which can be poured into sheets or thin plates or rolled out.
  • a pattern with a waffle structure, as shown in FIG. 1, is then placed on the disk emerges, imprinted. After the disc has dried and set, it becomes solid.
  • cones of a suitable shape (FIG. 2) are cast separately and dried in an oven at 100 ° C. until they also become solid. These pins are glued to the wafer-shaped side of the disk as long as it is still plastic, for example before the binder resin has set.
  • FIG. 1 A corresponding arrangement is shown in FIG. 1.
  • the carbide disk, which has not yet set, is then sintered in vacuo at 1460 ° C. for 60 minutes, the disk and the pins connecting to one another to form a compact unit (FIG. 3).
  • the sintered carbide disc is then attached to a sand core with Ceramabond 569 adhesive from Aremco.
  • the sand core and carbide disk are heated in an oven at 100 ° C. for 60 to 120 minutes in order to drive off the volatile constituents from the binder and to bind it. This can also be done at room temperature, but then requires a considerably longer period of time.
  • the cast iron is poured around the carbide disk by means of a conventional casting process, so that when the metal solidifies, the carbide disk is firmly connected to the metal surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Laminated Bodies (AREA)
  • Paper (AREA)
  • Mold Materials And Core Materials (AREA)

Claims (10)

  1. Procédé pour enrober des couches superficielles dures, résistantes à l'usure, de produits métalliques par coulée d'un métal liquide dans des moules, selon lequel on fabrique une couche résistante à l'usure sous la forme d'un disque ou d'une plaque mince, qui comporte des moyens d'ancrage pour sa fixation mécanique à la surface de la pièce coulée et qu'on fixe par collage sur une surface du moule avant la coulée du métal, caractérisé en ce qu'on mélange un matériau résistant à l'usure avec au moins un liant et au choix au moins un agent de ramollissement et on forme, avec le mélange, un disque préfabriqué, qui possède au moins un téton ou un élément d'accrochage, sur sa surface située à l'extérieur par rapport au moule, et qu'on fritte le disque préfabriqué pourvu du téton ou de l'élément d'accrochage avant sa fixation par collage au moule.
  2. Procédé selon la revendication 1, caractérisé en ce que le disque comporte une structure, de préférence un dessin gaufré, sur sa surface qui porte le téton ou l'élément d'accrochage.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le disque comporte plusieurs tétons fixés par collage de façon intégrée.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'on fixe les tétons fabriqués séparément, au disque et qu'on fritte ensuite le disque avec les tétons.
  5. Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'on commence à fritter les tétons et qu'on les fixe au disque et qu'on achève la finition du frittage du disque avec les tétons.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le moule de coulée contient un noyau de sable, sur lequel on fixe par collage la plaque ou le disque à l'aide d'un adhésif à haute température, de préférence un adhésif à haute température.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que le métal est du fer, notamment du fer ductile.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que le matériau dur résistant à l'usure contient du carbure de tungstène comportant un liant métallique, de préférence 14 à 17 % en poids de cobalt.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce qu'on fabrique, de préférence par coulée, le disque à partir d'un mélange d'une poudre d'un matériau résistant à l'usure, d'un liant organique et d'au moins un agent de ramollissement.
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce qu'on fabrique les tétons avec le même mélange que les disques, de préférence par coulée.
EP93100454A 1992-01-21 1993-01-14 Procédé pour la fabrication des surfaces résistantes à l'abrasion Expired - Lifetime EP0554682B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/822,904 US5267600A (en) 1992-01-21 1992-01-21 Hard facing casting surfaces with wear-resistant sheets
US822904 1992-01-21

Publications (2)

Publication Number Publication Date
EP0554682A1 EP0554682A1 (fr) 1993-08-11
EP0554682B1 true EP0554682B1 (fr) 1996-12-18

Family

ID=25237297

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93100454A Expired - Lifetime EP0554682B1 (fr) 1992-01-21 1993-01-14 Procédé pour la fabrication des surfaces résistantes à l'abrasion

Country Status (6)

Country Link
US (3) US5267600A (fr)
EP (1) EP0554682B1 (fr)
JP (1) JPH0798262B2 (fr)
CA (1) CA2086868C (fr)
DE (1) DE59304769D1 (fr)
MX (1) MX9300127A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014041409A2 (fr) 2012-09-14 2014-03-20 F. A. R. - Fonderie Acciaierie Roiale - Spa Procédé pour fabriquer des pièces coulées en acier

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AR007698A1 (es) * 1996-08-28 1999-11-10 Deere & Co Metodo para aportar dureza superficial a una superficie metalica y un lodo preparado por dicho metodo
NZ336217A (en) * 1999-06-10 2002-02-01 Svedala New Zealand Ltd Composite sacrificial components
US9616951B2 (en) 2002-03-06 2017-04-11 Deere & Company Non-carburized components of track-type machines having a metallurgically bonded coating
US8684475B2 (en) * 2002-03-06 2014-04-01 Deere & Company Components of track-type machines having a metallurgically bonded coating
US9138805B2 (en) 2002-03-06 2015-09-22 Deere & Company Method for applying wear resistant coating to mechanical face seal
US7657990B2 (en) * 2002-03-06 2010-02-09 Deere & Company Track chain link and undercarriage track roller having a metallurgically bonded coating
US6948784B2 (en) 2002-03-06 2005-09-27 Deere & Company Track pin bushing having a metallurgically bonded coating
US7163754B2 (en) * 2003-10-23 2007-01-16 Deere & Company Sprocket wheel having a metallurgically bonded coating and method for producing same
US9003681B2 (en) * 2006-09-18 2015-04-14 Deere & Company Bucket teeth having a metallurgically bonded coating and methods of making bucket teeth
US7828089B2 (en) * 2007-12-14 2010-11-09 Baker Hughes Incorporated Erosion resistant fluid passageways and flow tubes for earth-boring tools, methods of forming the same and earth-boring tools including the same
US8252225B2 (en) 2009-03-04 2012-08-28 Baker Hughes Incorporated Methods of forming erosion-resistant composites, methods of using the same, and earth-boring tools utilizing the same in internal passageways
DE102010013999A1 (de) * 2010-04-07 2011-10-13 Vautid Gmbh Verfahren zur Herstellung eines zumindest bereichsweise einen erhöhten Verschleißschutz aufweisenden Gusswerkstücks
US9283621B2 (en) 2012-06-21 2016-03-15 Deere & Company Method for forming a composite article
ITUD20120134A1 (it) * 2012-07-25 2014-01-26 F A R Fonderie Acciaierie Roiale S P A Procedimento per la fabbricazione di getti in acciaio e getti in acciaio cosi' fabbricati
US9038359B2 (en) 2012-11-12 2015-05-26 Deere & Company Rotary implement having hard metallic layer and method therefor
WO2015103670A1 (fr) * 2014-01-09 2015-07-16 Bradken Uk Limited Élément d'usure incorporant des particules résistant à l'usure et son procédé de fabrication
DE102014221852A1 (de) * 2014-10-27 2016-04-28 Volkswagen Aktiengesellschaft Gießwerkzeug mit zumindest einer Kavität zur Herstellung zumindest eines Gussteiles
AU2016209963B2 (en) * 2015-01-19 2019-11-21 Flsmidth A/S Interlocking wear-resistant panel system
US11103944B2 (en) 2019-08-12 2021-08-31 Deere & Company Self-sharpening cutting tooth for a felling apparatus
CN113714487B (zh) * 2021-08-23 2023-02-03 昆明理工大学 一种高耐磨wc颗粒增强钢铁基表层复合导板的制备方法

Family Cites Families (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1978319A (en) * 1932-06-16 1934-10-23 Harold W Mowery Method of making abrasive metal castings
US2339270A (en) * 1940-11-28 1944-01-18 American Optical Corp Abrading means
US2874429A (en) * 1953-02-05 1959-02-24 Aluminium Lab Ltd Process for casting-in of sintered metal bodies
DE1180435B (de) * 1958-12-12 1964-10-29 Varta Ag Kontinuierliches Verfahren zur Herstellung gesinterter Gerueste fuer Folienelektroden, insbesondere Bandelektroden, fuer elektrische Akkumulatoren
US3245826A (en) * 1963-06-12 1966-04-12 Clevite Corp Magnetic recording medium and method of manufacture
US3372469A (en) * 1963-10-28 1968-03-12 North American Rockwell Method and materials for obtaining low-resistance bonds to thermoelectric bodies
US3392439A (en) * 1963-10-28 1968-07-16 North American Rockwell Method and materials for obtaining low-resistance bonds to telluride thermoelectric bodies
US3594237A (en) * 1963-10-28 1971-07-20 North American Rockwell Thermoelectric device including tungsten granules for obtaining low resistance bonds
US3506498A (en) * 1963-10-28 1970-04-14 North American Rockwell Thermoelectric device including conductive granules for obtaining low resistance bonds
US3291578A (en) * 1963-11-04 1966-12-13 Gen Electric Metallized semiconductor support and mounting structure
US3507634A (en) * 1965-10-22 1970-04-21 United Aircraft Corp Composite metal structure
US3880674A (en) * 1970-01-20 1975-04-29 Rockwell International Corp Thermoelectric elements and devices and process therefor
US3707429A (en) * 1970-01-20 1972-12-26 North American Rockwell Thermoelectric element
BE793005A (fr) * 1971-12-20 1973-06-19 Union Carbide Corp Elements metalliques poreux renforces par une feuille
JPS5125211A (en) * 1974-08-23 1976-03-01 Tokyo Shibaura Electric Co Retsushano teiichijidoteishisochi
SE399911C (sv) * 1976-02-05 1980-01-31 Sandvik Ab Slitdetalj med hog slitstyrka och god hallfasthet, sammansatt av hardmetall och gjutjern
JPS5326565A (en) * 1976-08-25 1978-03-11 Hitachi Ltd Fluorescent face exposure unit for color braun tube
JPS54141209U (fr) * 1978-03-27 1979-10-01
GB2074912A (en) * 1980-05-01 1981-11-11 Amsted Ind Inc Ferrous metal castings with high hardness inserts
US4608318A (en) * 1981-04-27 1986-08-26 Kennametal Inc. Casting having wear resistant compacts and method of manufacture
US4556389A (en) * 1981-12-31 1985-12-03 Four Brain Company Ltd. Method and compositions for bonding metals and ceramics with which to make prosthetic teeth
JPS58192671A (ja) * 1982-04-14 1983-11-10 Sanjiyou Tokushu Chiyuukoushiyo:Kk 鋳造法
SU1163977A1 (ru) * 1983-05-19 1985-06-30 Ташкентский Ордена Дружбы Народов Политехнический Институт Им.А.Р.Бируни Способ подготовки пластин из твердого сплава
JPS6021306A (ja) * 1983-07-14 1985-02-02 Honda Motor Co Ltd 複合強化部材の製造方法
JPS60238078A (ja) * 1984-04-27 1985-11-26 Mazda Motor Corp 鋳物表面の高合金化法
JPS62199256A (ja) * 1986-02-27 1987-09-02 Ishikawajima Harima Heavy Ind Co Ltd 金属炭化物と合金との接合方法
US4955121A (en) * 1986-07-09 1990-09-11 Honda Giken Kogyo Kabushiki Kaisha Method for producing a rocker arm for use in an internal combustion engine
US4764434A (en) * 1987-06-26 1988-08-16 Sandvik Aktiebolag Diamond tools for rock drilling and machining
KR900004783B1 (ko) * 1987-07-01 1990-07-05 가와사끼 쥬고교 주식회사 이종재료의 중합체 및 그 제조방법
GB8814916D0 (en) * 1988-06-23 1988-07-27 T & N Technology Ltd Production of sealed cavity
US4875616A (en) * 1988-08-10 1989-10-24 America Matrix, Inc. Method of producing a high temperature, high strength bond between a ceramic shape and metal shape
US5027878A (en) * 1989-10-05 1991-07-02 Deere & Company Method of impregnation of iron with a wear resistant material
JP3024153B2 (ja) * 1990-02-07 2000-03-21 オイレス工業株式会社 複層焼結摺動部材
US5190091A (en) * 1990-08-08 1993-03-02 Deere & Company Method of impregnation of aluminum alloy with a wear-resistant material
US5190092A (en) * 1990-08-08 1993-03-02 Deere & Company Method of impregnation of iron with a wear-resistant material
JPH0625211A (ja) * 1992-07-13 1994-02-01 Mitsubishi Kasei Corp フラボンカルボン酸誘導体

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014041409A2 (fr) 2012-09-14 2014-03-20 F. A. R. - Fonderie Acciaierie Roiale - Spa Procédé pour fabriquer des pièces coulées en acier

Also Published As

Publication number Publication date
US5383513A (en) 1995-01-24
CA2086868C (fr) 1998-07-21
MX9300127A (es) 1993-07-01
JPH05261515A (ja) 1993-10-12
US5443916A (en) 1995-08-22
US5267600A (en) 1993-12-07
DE59304769D1 (de) 1997-01-30
JPH0798262B2 (ja) 1995-10-25
EP0554682A1 (fr) 1993-08-11
CA2086868A1 (fr) 1993-07-22

Similar Documents

Publication Publication Date Title
EP0554682B1 (fr) Procédé pour la fabrication des surfaces résistantes à l'abrasion
EP0554683A1 (fr) Procédé pour changer la surface des produits coulés par imprégnation de poudre
EP0421374A2 (fr) Procédé de fabrication d'articles en fonte avec couche superficielle résistante à l'usure et produit réalisé avec ce procédé
DE1775322A1 (de) Gleitlager mit feinverteiltem Aluminium als Grundmaterial und Verfahren und zu dessen Herstellung
DE1262515B (de) Thermisch isolierte Giessformen
DE3304073A1 (de) Verfahren zur erstellung von formen fuer das spritzgiessen, insbesondere von werkzeugen fuer das spritzgiessen von kunststoff
EP0552666A1 (fr) Procédé de fabrication d'objets plastiques comportant des surfaces dures et résistantes à l'usure
EP1117943A1 (fr) Procede de production de disques de freins composes d'elements ceramique et dotes d'un moyeu metallique
EP1604756A2 (fr) procédé pour produire des structures métalliques réticulées
DE102009059806A1 (de) Leichtbauverbundbremsscheibe und deren Herstellung
WO1982003339A1 (fr) Filtre en ceramique, procede de fabrication et utilisation de ce filtre
EP0581170A1 (fr) Moule de grille pour coulée des grilles d'accumulateur en plomb et procédé
DE112018002874T5 (de) Verbundwerkstoffteil und Verfahren und Werkzeug zum Herstellen desselben
EP1135226B1 (fr) Piece moulee composite et son procede de fabrication
EP0316978B1 (fr) Dispositif de moulage à porosité variable pour la fabrication de moules de fonderie en sable et son procédé de fabrication
DE102009049875A1 (de) Bremsscheibe mit einem ringförmigen Reibkörper und Verfahren zum Herstellen des Reibkörpers
EP0421084B1 (fr) Procédé d'obtention d'une pièce par métallurgie des poudres
DE102010005897A1 (de) Verfahren zum Herstellen eines Körpers mittels Sprühkompaktieren und mittels Sprühkompaktieren hergestellter Körper
DE2534050B2 (de) Verbundgiessverfahren
EP0470503A1 (fr) Procédé de fabrication de produits métalliques avec surface résistant à l'usure
DE1301017B (de) Verfahren zum Verhindern des Werfens bei der pulvermetallurgischen Herstellung von schlanken Formkoerpern
WO2018077340A1 (fr) Procédé et installation de fabrication d'une garniture de friction en métal fritté
EP0590186B1 (fr) Noyaux pour la coulée à la cire perdue
DE102018106725A1 (de) Verfahren zur Herstellung einer Gussform zum Einfüllen von Schmelze sowie Gussform
WO2000010752A1 (fr) Outil de fonderie pour la coulee de pieces moulees en metaux non ferreux

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

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19930717

17Q First examination report despatched

Effective date: 19950817

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

ITF It: translation for a ep patent filed

Owner name: LENZI & C.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19961219

REF Corresponds to:

Ref document number: 59304769

Country of ref document: DE

Date of ref document: 19970130

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

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

Ref country code: FR

Payment date: 20120130

Year of fee payment: 20

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

Ref country code: DE

Payment date: 20111221

Year of fee payment: 20

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

Ref country code: IT

Payment date: 20120124

Year of fee payment: 20

Ref country code: GB

Payment date: 20120126

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 59304769

Country of ref document: DE

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20130113

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 EXPIRATION OF PROTECTION

Effective date: 20130113

Ref country code: DE

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20130115