Additional Operation Between Heating Steps Patents (Class 419/55)
  • Patent number: 10639879
    Abstract: A method of selecting a scanning sequence of a laser beam in a selective laser solidification process, in which one or more objects are formed layer-by-layer by repeatedly depositing a layer of powder on a powder bed and scanning the laser beam over the deposited powder to selectively solidify at least part of the powder layers, includes determining an order in which areas should be scanned by: projecting a debris fallout zone that would be created when solidifying each area based on a gas flow direction of a gas flow passed over the powder bed; determining whether one or more other areas to be solidified fall within the debris fallout zone; and selecting to solidify the one or more other areas that fall within the debris fallout zone before solidifying the area from which the debris fallout zone has been projected.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: May 5, 2020
    Assignee: RENISHAW PLC
    Inventor: Ben Ian Ferrar
  • Patent number: 10272525
    Abstract: The present disclosure describes three-dimensional (3D) printing apparatuses and systems for producing 3D objects. Described herein are printing apparatuses and systems that are configured to facilitate control of debris within an enclosure where one or more printing operations are performed. Printing apparatuses and systems of the present disclosure may each have one or more components, such as, for example, component(s) that are configured to facilitate gas flow trajectories (e.g., turbulent movement) within an enclosure in which a 3D object is printed.
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: April 30, 2019
    Assignee: VELO3D, INC.
    Inventors: Benyamin Buller, Zachary Ryan Murphree
  • Patent number: 9415443
    Abstract: A method for forming a three-dimensional article through successive fusion of parts of a powder bed, which parts corresponds to successive cross sections of the three-dimensional article, said method comprising the steps of: providing a model of said three dimensional article, providing a first powder layer on a work table, directing a first energy beam from a first energy beam source over said work table causing said first powder layer to fuse in first selected locations according to said model to form a first cross section of said three-dimensional article, directing a second energy beam from a second energy beam source over said work table causing said first powder layer to fuse in second selected locations according to said model to form the first cross section of said three-dimensional article, wherein said first and second locations of said first powder layer are at least partially overlapping each other.
    Type: Grant
    Filed: April 3, 2014
    Date of Patent: August 16, 2016
    Assignee: Arcam AB
    Inventors: Ulric Ljungblad, Anders Snis
  • Publication number: 20150139849
    Abstract: acting on a powder layer in a working zone, containing a device for layering said powder, said device including: means for storing powder, means for distributing powder that travel over the working zone to distribute powder in a layer having a final thickness for additive manufacturing, feeding means that transfer powder from storage means to distributing means, metering means that control the quantity of powder transferred from storage means to distributing means, said machine being wherein: storage means are positioned higher than the working zone, feeding means utilize gravity, feeding means and the metering means move with the distributing means, the machine has two separate working zones and two separate working trays that move independently of one another, each of the working trays is associated with only one working zone, and the layering device is common to both working zones.
    Type: Application
    Filed: June 3, 2013
    Publication date: May 21, 2015
    Applicants: MICHELIN RECHERCHE ET TECHNIQUE, S.A., COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN
    Inventors: Frederic Pialot, JR., Gilles Walrand, Pierre Wiel
  • Publication number: 20150104346
    Abstract: A laser sintering powder to be sintered by irradiation with a laser light is provided. The sintering powder includes a plurality of metal particles and a binder which binds the metal particles to one another. The binder is sublimated by the irradiation with the laser light. The average particle diameter of the metal particles is 5 ?m or more and 10 ?m or less, and the average particle diameter of the laser sintering powder is 30 ?m or more and 50 ?m or less. Further, after a powder layer is formed using the laser sintering powder, this powder layer may be compressed in the thickness direction before or after irradiation with the laser light.
    Type: Application
    Filed: October 10, 2014
    Publication date: April 16, 2015
    Inventors: Hidefumi NAKAMURA, Yu MAEDA
  • Publication number: 20150093283
    Abstract: Improved devices and methods for additive manufacturing of implant components are disclosed, including improvements relating to utilizing support structures, aligning implant designs within the manufacturing apparatus, and making patient-adapted implants.
    Type: Application
    Filed: April 13, 2013
    Publication date: April 2, 2015
    Inventors: Bob Miller, David P. Hesketh
  • Publication number: 20150086409
    Abstract: A method for forming a three-dimensional article comprising applying a first powder layer on a work table; directing a first energy causing said first powder layer to fuse in first selected locations to form a first cross section where said first energy beam is fusing a first region with parallel scan lines in a first direction and a second region with parallel scan lines in a second direction; fusing at least one of the scan lines in said first region in said first direction immediately before fusing at least one of said scan lines in said second region in said second direction; applying a second powder layer and directing the energy beam causing said second powder layer to fuse in second selected locations where the energy beam is fusing said first region with parallel scan lines in a third direction and said second region in a fourth direction.
    Type: Application
    Filed: August 5, 2014
    Publication date: March 26, 2015
    Inventor: Calle Hellestam
  • Publication number: 20150064047
    Abstract: A method of fabricating a three dimensional structure includes delivering a metal material to a printing site; and defining a microstructure of the metal material at the printing site by controlling the delivery of heating energy to the printing site and controlling the delivery of ultrasonic vibrations to the printing site.
    Type: Application
    Filed: August 28, 2013
    Publication date: March 5, 2015
    Inventors: Roderick A. Hyde, Lowell L. Wood, JR.
  • Patent number: 8968641
    Abstract: The present invention relates to a process for producing porous metallic materials comprising the steps of: (a) miming metallic particles with a carbonate additive and a binder, wherein the quantity of carbonate additive in the mixture is in the range of 40 to 90 vol % and compressing the mixture beyond the yield strength of the metallic particles; (b) heating the mixture to a first temperature sufficient to evaporate the binder; (c) heating and maintaining the temperature of the mixture to a second temperature sufficient to sinter the metallic particles but insufficient to decompose or melt the carbonate additive; (d) removing the carbonate additive from the sintered porous metallic material; and optionally (e) heating and maintaining the temperature of the porous metallic material to a third temperature greater than the second temperature so as to enhance the sintering. The present invention also relates to metallic materials produced by such a process.
    Type: Grant
    Filed: May 19, 2005
    Date of Patent: March 3, 2015
    Assignee: The University of Liverpool
    Inventor: Yuyuan Zhao
  • Publication number: 20150053291
    Abstract: A method for manufacturing a fluid-leading component includes positioning a base element machined by a material-removing method with a planar upper face in a mounting support. The method at least includes the initial application of a layer section with predetermined dimensions of a particulate material in a predetermined region on the planar upper face of the base element; the heating of the layer section by a heat source in such a manner that the particles of the material within predetermined dimensions bond; and the application thereto and heating of at least one further layer section with predetermined dimensions of a particulate material in a predetermined region. In this way it is possible, in the generative manufacturing method, to obviate the need to provide support structures that subsequently have to be removed, and the base element is a functional part of the component to be manufactured.
    Type: Application
    Filed: October 24, 2014
    Publication date: February 26, 2015
    Applicants: Airbus Operations GmbH, Liebherr-Aerospace Lindenberg GmbH
    Inventors: Gerhard Hummel, Philipp Rapp, Lothar Kroll, Frank Schubert, Martin Kausch
  • Patent number: 8951465
    Abstract: A method for preparing an implant having a porous metal component. A loose powder mixture including a biocompatible metal powder and a spacing agent is prepared and compressed onto a metal base. After being compressed, the spacing agent is removed, thereby forming a compact including a porous metal structure pressed on the metal base. The compact is sintered, forming a subassembly, which is aligned with a metal substrate portion of an implant. A metallurgical bonding process, such as diffusion bonding, is performed at the interface of the subassembly and the metal substrate to form an implant having a porous metal component.
    Type: Grant
    Filed: February 25, 2013
    Date of Patent: February 10, 2015
    Assignee: Biomet Manufacturing, LLC
    Inventor: Gautam Gupta
  • Publication number: 20140370323
    Abstract: A method for increasing the resolution when forming a three-dimensional article through successive fusion of parts of a powder bed, said method comprising providing a vacuum chamber, providing an electron gun, providing a first powder layer on a work table inside said vacuum chamber, directing an electron beam from said electron gun over said work table causing the powder layer to fuse in selected locations to form a first cross section of said three-dimensional article, providing a second powder layer on said work table, directing the electron beam over said work table causing said second powder layer to fuse in selected locations to form a second cross section of said three-dimensional article, reducing the pressure in the vacuum chamber from a first pressure level to a second pressure level between the providing of said first powder layer and said second powder layer.
    Type: Application
    Filed: December 4, 2012
    Publication date: December 18, 2014
    Applicant: ARCAM AB
    Inventor: Ulf Ackelid
  • Publication number: 20140314613
    Abstract: A method of selectively combining particulate material, comprising: (i) providing a layer of particulate material to a part bed; (ii) providing radiation to sinter a portion of the material of the layer; (iii) providing a further layer of particulate material overlying the prior layer of particulate material including the previously sintered portion of material; (iv) providing radiation to sinter a further portion of the material within the overlying further layer and to sinter said further portion with the previously sintered portion of material in the prior layer; (v) successively repeating blocks (iii) and (iv) to form a three-dimensional object; and wherein at least some of the layers of particulate material are pre-heated with a heater prior to sintering a portion of the material of the respective layer, the heater being configured to move relative to, and proximate, the particulate material.
    Type: Application
    Filed: August 1, 2012
    Publication date: October 23, 2014
    Applicant: Loughborough University
    Inventors: Neil Hopkinson, Helen Rhiannon Thomas
  • Patent number: 8758676
    Abstract: A component is manufactured from a powdered material such as a titanium alloy, by performing a first hot isostatic pressing HIP operation on the powdered material 14 while the powdered material is in contact with a molding surface 8 of a rigid, usable molding tool 2. The first HIP operation creates a non-porous shaped surface 16 on a partially consolidated component 14, but avoids bonding or reaction between the partially consolidated component 14 and the molding tool 2. After separation of the partially consolidated component 14 from the molding tool 2, the partially consolidated component 14 is subjected to a second HIP operation in which the powdered material is fully consolidated.
    Type: Grant
    Filed: November 12, 2010
    Date of Patent: June 24, 2014
    Assignee: Rolls-Royce PLC
    Inventors: Wayne E. Voice, Junfa Mei
  • Patent number: 8715385
    Abstract: A bearing material and a method for the manufacture of a bearing having a lining of the bearing material is described, the bearing material comprising: in wt %: 4-12 tin; 0.1-2 nickel; 1-6 bismuth; 0.01-less than 0.10 alumina; balance copper apart from incidental impurities.
    Type: Grant
    Filed: November 25, 2009
    Date of Patent: May 6, 2014
    Assignee: MAHLE International GmbH
    Inventors: Raymond Brigdeman, Janette Johnston
  • Publication number: 20130343947
    Abstract: Disclosed is a method for monitoring a generative production process in real time, wherein a component is at least optically detected and the installation space is thermally detected when applying a layer, as well as a device for carrying out said method.
    Type: Application
    Filed: January 11, 2012
    Publication date: December 26, 2013
    Applicant: MTU Aero Engines AG
    Inventors: Wilhelm Satzger, Siegfried Sikorski, Karl-Heinz Dusel, Wilhelm Meir, Bertram Kopperger, Josef Waermann, Andreas Jakimov, Manuel Hertter, Hans-Christian Melzer, Thomas Hess
  • Patent number: 8585853
    Abstract: A layered manufacturing method for forming a desired three-dimensional object by using a powder as a raw material. The method forms a desired solid body, which is employed in a layered manufacturing device, including a stage member having stage surface; a transparent member having an optical window to cover the stage surface to form an enclosed region together with the stage surface; and an exhaust system for exhausting gasses in the enclosed region. The optical window is positioned at a vertical upper direction when the enclosed region is formed.
    Type: Grant
    Filed: May 17, 2011
    Date of Patent: November 19, 2013
    Inventors: Keijirou Yamamoto, Tsuyoshi Tokunaga
  • Patent number: 8501048
    Abstract: The present invention provides a metal-graphite composite material favorable to two-dimensional diffusion of heat and having a high thermal conductivity in two axial directions, and a production method therefor. The metal-graphite composite material of the present invention includes: 20 to 80% by volume of a scaly graphite powder; and a matrix selected from the group consisting of copper, aluminum and alloys thereof, wherein the scaly graphite powder in which a normal vector to a scaly surface thereof is tilted at 20° or higher with respect to a normal vector to a readily heat-conducting surface of the metal-graphite composite material is 15% or less relative to a whole amount of the scaly graphite powder, and the metal-graphite composite material has a relative density of 95% or higher.
    Type: Grant
    Filed: October 14, 2008
    Date of Patent: August 6, 2013
    Assignee: Shimane Prefectural Government
    Inventors: Toshiyuki Ueno, Takashi Yoshioka
  • Publication number: 20130177767
    Abstract: An apparatus for the layer-by-layer production of three-dimensional objects having a material application unit containing a doctor blade with an edge closest to the construction field having a non-continuous straight line. In one embodiment the blade may vibrate. A process for layer-by-layer production, wherein the construction field is completely coated with applied powder prior to irradiation is also provided. Three dimensional articles made according to the invention are also provided.
    Type: Application
    Filed: January 3, 2013
    Publication date: July 11, 2013
    Inventors: Maik GREBE, Wolfgang DIEKMANN, Juergen KREUTZ
  • Publication number: 20130065073
    Abstract: There is provided a metal powder for use in a selective laser sintering method for producing a three-dimensional shaped object, wherein the metal powder comprises a powder mixture of a precipitation-hardening metal composition. In particular, the metal powder of the present invention is configured to have a Fe-based component powder and a Ni-based component powder which are individually included in the powder mixture wherein a powder made of an alloy of Fe-based and Ni-based components is not included as a main powder in the powder mixture.
    Type: Application
    Filed: May 23, 2011
    Publication date: March 14, 2013
    Applicant: PANASONIC CORPORATION
    Inventor: Isao Fuwa
  • Patent number: 8361380
    Abstract: A method for providing a porous metal implant. A mixture of biocompatible metal, a spacing agent, and a binder is provided. The mixture is formed into a shape and the spacing agent is removed to form a plurality of pores in the implant. A shaped porous metal is also provided.
    Type: Grant
    Filed: February 7, 2011
    Date of Patent: January 29, 2013
    Assignee: Biomet Manufacturing Corp.
    Inventors: Ned M. Hamman, James B. Fleming, Isaac Janson, Mukesh Kumar, Jason D. Meridew, Elizabeth A. Schlueter
  • Patent number: 8329093
    Abstract: A method for preparing metal-matrix composites including cold-process isostatic compaction of previously mixed powders and hot-process uniaxial pressing of the resulting compact is disclosed. The method enables metal-matrix composites with improved properties to be obtained. A device for implementing isostatic compaction comprising a latex sheath into which the mixture of powders is poured, a perforated cylindrical container in which the latex sheath is arranged, and means for sealed insulation of the mixture of powders contained in the sheath is also disclosed.
    Type: Grant
    Filed: March 14, 2006
    Date of Patent: December 11, 2012
    Assignee: Forges de Bologne
    Inventor: Jacques Tschofen
  • Patent number: 8309839
    Abstract: A method of improving the thermoelectric figure of merit (ZT) of a high-efficiency thermoelectric material is disclosed. The method includes the addition of fullerene (C60) clusters between the crystal grains of the material. It has been found that the lattice thermal conductivity (?L) of a thermoelectric material decreases with increasing fullerene concentration, due to enhanced phonon-large defect scattering. The resulting power factor (S2/?) decrease of the material is offset by the lattice thermal conductivity reduction, leading to enhanced ZT values at temperatures of between 350 degrees K and 700 degrees K.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: November 13, 2012
    Assignees: GM Global Technology Operations LLC, Shanghai Institute of Ceramics, Chinese Academy of Sciences
    Inventors: Lidong Chen, Xun Shi, Jihui Yang, Gregory P. Meisner
  • Patent number: 8283046
    Abstract: A ferrous sintered multilayer roll-formed bushing having a ferrous sintered sliding material layer which is sinter-bonded to a back metal steel, wherein the ferrous sintered sliding material layer is produced in such a manner that a Fe—C—Cu—Sn based sintered sliding material mixed powder containing at least carbon of 0.40 to 15 wt %, Cu of 13 to 40 wt % and Sn of 0.5 to 10 wt % is preliminarily sinter-bonded to said back metal steel and then finally sinter-bonded by a liquid-phase sintering at high temperatures higher than 1000° C. after bending into a roll.
    Type: Grant
    Filed: January 30, 2007
    Date of Patent: October 9, 2012
    Assignee: Komatsu Ltd.
    Inventor: Takemori Takayama
  • Publication number: 20120251378
    Abstract: There is provided a method for manufacturing a three-dimensional shaped object. The method of the present invention comprises the steps of: (i) forming a solidified layer by irradiating a predetermined portion of a powder layer with a light beam, thereby allowing sintering of the powder of the predetermined portion or melting and subsequent solidification thereof; and (ii) forming another solidified layer by newly forming a powder layer on the resulting solidified layer, and then irradiating another predetermined portion of the new powder layer with the light beam, the steps (i) and (ii) being repeatedly performed in a chamber; wherein a localized gas flow is provided in the chamber, and at least a part of a fume generated by the irradiation of the light beam is entrained by the localized gas flow.
    Type: Application
    Filed: October 20, 2010
    Publication date: October 4, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Satoshi Abe, Norio Yoshida, Isao Fuwa, Yoshikazu Higashi
  • Patent number: 7906222
    Abstract: A sliding material has a sintered layer formed atop a backing plate. The sintered layer contains 5-15 mass % of Bi nonuniformly distributed in a Cu—Sn alloy matrix consisting essentially of 8-12 mass % of Sn and a remainder of Cu. The sliding material can be manufactured by nonuniformly mixing Cu—Sn alloy powder and Bi powder, dispersing the mixed powder on a backing plate, and sintering the mixed powder to form a sintered layer on the backing plate. The sliding material does not undergo seizing and does not have separation of the sintered layer from the backing plate even when used in severe conditions such as in hydraulic equipment or construction equipment.
    Type: Grant
    Filed: July 10, 2007
    Date of Patent: March 15, 2011
    Assignee: Senju Metal Industry Co., Ltd.
    Inventors: Sinzo Nakamura, Naoki Sato, Toshio Hakuto
  • Patent number: 7807099
    Abstract: Earth-boring tools for drilling subterranean formations include a particle-matrix composite material comprising a plurality of silicon carbide particles dispersed throughout a matrix material, such as, for example, an aluminum or aluminum-based alloy. In some embodiments, the silicon carbide particles comprise an ABC—SiC material. Methods of manufacturing such tools include providing a plurality of silicon carbide particles within a matrix material. Optionally, the silicon carbide particles may comprise ABC—SiC material, and the ABC—SiC material may be toughened to increase a fracture toughness exhibited by the ABC—SiC material. In some methods, at least one of an infiltration process and a powder compaction and consolidation process may be employed.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: October 5, 2010
    Assignee: Baker Hughes Incorporated
    Inventors: Heeman Choe, John H. Stevens, James C. Westhoff, Jimmy W. Eason, James L. Overstreet
  • Publication number: 20090311124
    Abstract: A first green or brown object is sintered while being supported by a second green or brown object in a furnace, and a body of an earth-boring tool is formed from the first object. An object is sectioned to form first and second structures, and the first structure is sintered within a furnace while it is supported by (e.g., resting on) the second structure. A layer of powder material is provided on a green or brown object, another green or brown object is rested on the powder material over the first green or brown object, and the first and second green or brown objects are sintered with the powder material therebetween. Intermediate structures formed during fabrication of a body of an earth-boring tool include a layer of powder between a green or brown tool body precursor and a green or brown structure supporting the green or brown tool body.
    Type: Application
    Filed: June 13, 2008
    Publication date: December 17, 2009
    Applicant: BAKER HUGHES INCORPORATED
    Inventor: Nicholas J. Lyons
  • Patent number: 7540996
    Abstract: Methods and powder blends are provided for fabricating a metal part. One method includes the first steps of spreading a layer of a powder blend on a platform, the powder blend including a titanium base metal or alloy, and an alloying metal having a lower melting temperature than that of the base metal or alloy. Next, an energy beam is directed onto selected areas of the powder blend layer to thereby melt the alloying metal. Then, the alloying metal is re-solidified by withdrawing the energy beam from the powder blend layer. Then, a preform part is built up by iteratively performing the spreading, melting, and re-solidifying steps on additional adjacently formed layers. A metal liquid phase sintering process is performed at a temperature sufficient to melt the alloying metal but not the base metal or alloy.
    Type: Grant
    Filed: November 21, 2003
    Date of Patent: June 2, 2009
    Assignee: The Boeing Company
    Inventor: Clifford C. Bampton
  • Patent number: 7524475
    Abstract: A cerium oxide powder for one-component CMP slurry, which has a specific surface area of 5 m2/g or more, and a ratio of volume fraction of pores with a diameter of 3 nm or more to that of pores with a diameter less than 3 nm of 8:2˜2:8, is disclosed. A method for preparing the same, a one-component CMP slurry comprising the same as an abrasive material, and a method of shallow trench isolation using the one-component CMP slurry are also disclosed. The CMP slurry causes no precipitation of the cerium oxide powder even if it is provided as a one-component CMP slurry, because the CMP slurry uses, as an abrasive material, cerium oxide powder that is obtained via a low-temperature calcination step, optionally a pulverization step, and a high-temperature calcination step and has a high pore fraction and low strength.
    Type: Grant
    Filed: September 1, 2006
    Date of Patent: April 28, 2009
    Assignee: LG Chem, Ltd.
    Inventors: Seung Beom Cho, Jun Seok Nho, Dong Mok Shin, Jong Pil Kim, Myoung Hwan Oh, Jang Yul Kim, Eun Mi Choi, Min Jin Ko
  • Patent number: 7520940
    Abstract: A method of forming an oxide layer on a powder metal part includes subjecting the powder metal part to a steam oxidation process. An oxide layer is formed on the powder metal part. The oxide layer has a thickness greater than 7 microns.
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: April 21, 2009
    Assignee: Caterpillar Inc.
    Inventors: Hyung Kyu Yoon, Thomas E. Clements, Daniel Patrick Vertenten, David Anthony Cusac
  • Patent number: 7354548
    Abstract: Hardmetal compositions each including hard particles having a first material and a binder matrix having a second, different material comprising rhenium or a Ni-based superalloy. A two-step sintering process may be used to fabricate such hardmetals at relatively low sintering temperatures in the solid-state phase to produce substantially fully-densified hardmetals.
    Type: Grant
    Filed: September 14, 2004
    Date of Patent: April 8, 2008
    Assignee: Genius Metal, Inc.
    Inventor: Shaiw-Rong Scott Liu
  • Patent number: 7144642
    Abstract: A ferrite magnet obtained by adding a ferrite having a hexagonal W-type magnetoplumbite structure to a ferrite having a hexagonal M-type magnetoplumbite structure, in which a portion of Sr, Ba, Pb or Ca is replaced with at least one element that is selected from the group consisting of the rare-earth elements (including Y) and Bi and that always includes La, during the fine pulverization process thereof. By adding a small amount of the element such as Co, Ni, Mn or Zn to the ferrite already having the hexagonal M-type magnetoplumbite structure during the fine pulverization process thereof, the magnetic properties can be improved.
    Type: Grant
    Filed: February 6, 2002
    Date of Patent: December 5, 2006
    Assignee: Neomax Co., Ltd.
    Inventors: Etsushi Oda, Seiichi Hosokawa, Sachio Toyota
  • Patent number: 7141209
    Abstract: There is provided a method for producing oxide dispersion strengthened ferritic steel tube by fabricating a raw tube by mixed sintering of a metal powder and an oxide powder and producing a tube of the desired shape by repeating cold rolling and heat treatment for a total of three times or more. The method comprises performing each of the intermediate heat treatments during the cold rolling by a two-step heat treatment consisting of a first step heat treatment of 1100° C. or lower and a second step heat treatment of 1100 to 1250° C. and higher than the first step temperature, and performing the final heat treatment at 1100° C. or higher.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: November 28, 2006
    Assignee: Japan Nuclear Cycle Development Institute
    Inventors: Takeji Kaito, Shigeharu Ukai, Satoshi Ohtsuka, Toshimi Kobayashi
  • Patent number: 6730263
    Abstract: The invention relates to a method for producing a sintered part comprised of a powdery material, especially comprised of a sintered metallurgical powder. According to the inventive method, a green compact which forms an elementary shape of the part is firstly compression molded from the powder. The desired final shape of the part is produced by subjecting partial areas of the elementary shape on the green compact to a successive non-cutting shaping. Afterwards, said final shape is finished by sintering.
    Type: Grant
    Filed: May 2, 2001
    Date of Patent: May 4, 2004
    Assignee: GKN Sinter Metals GmbH
    Inventors: Eberhard Ernst, Bernhard Brust, Berthold Morber, Wolfgang Schiemenz
  • Patent number: 6716388
    Abstract: A rotary chip-removing tool includes a rotary tool body and a tool tip fastened on a front end thereof. The tool tip is formed of an injection molded body which has an integral cutting edge at its front end, and a coupling structure at its rear end. The coupling structure can be in the form of a threaded hole, or a rearward projection, for coupling the tool tip against the tool body. The tool tip is formed of first and second materials. The first material forms at least part of the cutting edge, and the second material forms the coupling structure. The first material is more brittle than the second material, and the second material is tougher than the first material.
    Type: Grant
    Filed: February 4, 2003
    Date of Patent: April 6, 2004
    Assignee: Seco Tools AB
    Inventors: Johnny Bruhn, Mattias Puide, Mikael Gronkvist
  • Patent number: 6696168
    Abstract: A composite strip of compacted powders, which has a three layers structure, is continuously obtained by means of a rolling machine for powder compacting. The composite strip is sintered at a temperature of 460° C. to 550° C. to form a sintered composite strip. The sintered composite strip is continuously bonded by rolling to a steel strip. The bonded composite strip is optionally subjected to a heat treatment of heating at a temperature of 250° C. to 400° C. followed by heating to a temperature of 400° C. to 510° C., holding the strip under the temperature for not less than 30 seconds, and rapidly cooling down to 300° C. at a cooling rate of not lower than 50° C./minute, whereby obtaining a multi-layered composite material consisting of the steel strip, a sintered bonding layer, a sintered sliding layer and a sintered sacrificial layer.
    Type: Grant
    Filed: April 29, 2002
    Date of Patent: February 24, 2004
    Assignee: NDC Company Ltd.
    Inventors: Yasukuni Hasegawa, Koue Ohkawa, Hiroyuki Sugawara
  • Patent number: 6682693
    Abstract: An inclined function material is formed with an iron layer on a surface of a carbon material. This material can be used in a carbon base member and does not limit the choice of desired characteristics in a carbon base member. The process by which the carbon base member is formed also ensures the iron layer is integrated firmly with the surface of the carbon material. A suitable amount of an iron powder having a particle diameter of 5 to 15 &mgr;m is placed directly on the surface of a carbon material, which is sintered in advance under suitable conditions, and stuck to the surface uniformly and flatly. The iron powder and the carbon material are sintered at 1000° C. to 1300° C. and preferably 1050 to 1150° C. for 1 to 2 hours and preferably about 1.5 hours to form a carbon base member in which the iron layer is formed on one surface of the carbon base member.
    Type: Grant
    Filed: July 17, 2002
    Date of Patent: January 27, 2004
    Assignee: Mitsuba Corporation
    Inventors: Yoshihiro Tanaka, Mitsunari Ishizaki, Motoaki Kuribara
  • Patent number: 6630101
    Abstract: A method of producing a gear from a metallurgical powder includes molding at least a portion of the powder to provide a gear preform. The gear preform is sintered and hot formed, and subsequently may be carburized. The gear preform is resintered and cooled at a cooling rate suitable to provide a bainitic microstructure in at least a surface region of the preform. The gear teeth of the preform may be shaved to, for example, adjust dimensions, and enhance dimensional uniformity.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: October 7, 2003
    Assignee: Keystone Investment Corporation
    Inventors: Gary L. Anderson, William J. Olson
  • Patent number: 6564689
    Abstract: Blank for a gun barrel, consisting of a steel bar, which bar, in one or more hot working steps, has been repeatedly wrung about its own longitudinal axis.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: May 20, 2003
    Assignee: Damasteel Aktiebolag
    Inventor: Per Billgren
  • Patent number: 6503443
    Abstract: In a preliminary molding step 1, a metallic powder mixture 7 obtained by blending an iron-based metal powder 7a with graphite 7b such that the graphite is present in an amount of preferably not less than 0.1% by weight, more preferably not less than 0.3% by weight, is compacted into a preform 8 having a density of not less than 7.3 g/cm3. In a provisional sintering step 2, the preform 8 is provisionally sintered at a predetermined temperature to form a metallic powder-molded body 9 having a structure in which the graphite remains along a grain boundary of the metal powder. In a re-compaction step 3, the metallic powder-molded body 9 is re-compacted into a re-compacted body 10. In a re-sintering step 4, the re-compacted body 10 is re-sintered to obtain a sintered body 11. In a heat treatment step 5, the sintered body 11 is heat-treated to obtain a heat-treated sintered body 11.
    Type: Grant
    Filed: October 6, 2000
    Date of Patent: January 7, 2003
    Assignees: Unisia Jecs Corporation, Kawasaki Steel Corporation
    Inventors: Takashi Yoshimura, Hiroyuki Amma, Masashi Fujinaga, Mitsumasa Iijima, Yasuo Hatai, Takayuki Matsumoto, Satoshi Uenosono, Shigeru Unami
  • Patent number: 6413472
    Abstract: A method of manufacturing screws which can form screws each having a desired hollow axial bore easily and having excellent machinability is provided. The method comprises the steps of (A) producing a green body containing metal powder by means of extrusion molding; (B) debinding the green body to obtain a brown body; and (C) sintering the brown body to obtain a sintered compact, wherein at least one machine working including a thread cutting process is carried out at anytime after the completion of the step (A). The step (C) of this method may include a pre-sintering step for obtaining a pre-sintered compact and a secondary sintering process, and the machining process including a thread cutting process is carried out onto the pre-sintered compact after the completion of the pre-sintering step.
    Type: Grant
    Filed: August 14, 2000
    Date of Patent: July 2, 2002
    Assignee: Injex Corporation
    Inventors: Masaaki Sakata, Junichi Hayashi
  • Patent number: 6338747
    Abstract: A method for producing a material includes providing a metallurgical powder including iron, 1.0 to 3.5 weight percent copper, and 0.3 to 0.8 weight percent carbon. At least a portion of the powder is compressed at 20 tsi to 70 tsi to provide a compact, and subsequently the compact is heated at high temperature and then cooled at a cooling rate no greater than 60° F. per minute to increase the surface hardness of the compact to no greater than RC 25. The density of at least a region of the sintered compact is increased, by a mechanical working step or otherwise, to at least 7.6 grams/cc. The sintered compact is then re-heated to high temperature and cooled at a cooling rate of at least 120° F./min. so as to increase the surface hardness of the compact to greater than RC 25, and preferably at least RC 30. Material made by the method of the invention also is disclosed.
    Type: Grant
    Filed: August 9, 2000
    Date of Patent: January 15, 2002
    Assignee: Keystone Investment Corporation
    Inventor: John C. Kosco
  • Patent number: 6238619
    Abstract: The invention concerns a process for the production of a porous lithium cobaltite electrode plate with a large inner surface and low polarization resistance. Lithium carbonate powder and cobalt metal powder are uniformly mixed together and then films are produced from the mixture and plates from the films, which plates are sintered and then placed in an air stream for several hours at a temperature between 400° C. and 488° C. until the conversion of said plates to lithium cobaltite electrode plates with an extremely large inner surface has taken place.
    Type: Grant
    Filed: June 15, 1999
    Date of Patent: May 29, 2001
    Assignee: MTU Motoren- und Turbinen-Union Friedrichshafen GmbH
    Inventors: Manfred Bischoff, Bernd Rohland, Uwe Jantsch
  • Patent number: 6203753
    Abstract: The present invention provides a method for making metal parts from metal powder compositions comprising an iron base metal powder and an amide lubricant. The method comprises the steps of compacting said composition, pre-sintering the compacted composition, compacting the compacted and pre-sintered composition, and sintering the recompacted composition. The metal parts have improved physical and mechanical properties.
    Type: Grant
    Filed: May 13, 1997
    Date of Patent: March 20, 2001
    Assignee: The Presmet Corporation
    Inventor: Ian W. Donaldson
  • Patent number: 6171546
    Abstract: The present invention concerns compacted and optionally presintered bodies, which are prepared from metal powders and which have densified surfaces, obtained by shot peening or rolling.
    Type: Grant
    Filed: December 10, 1998
    Date of Patent: January 9, 2001
    Assignee: Högan{umlaut over (a)}s AB
    Inventors: Owe Mårs, Nils Carlbaum
  • Patent number: 6126896
    Abstract: A method of making TiC based cermets through a reaction milling process is disclosed. In the method of this invention, a particle mixture, consisting of 50-95 wt. % Ti-C particles, with Ti particles being mixed with C particles at a weight ratio of 4:1, and 5-50 wt. % Ni particles, is reaction-milled in a Spex mill, thus making TiC based particles. A preform is formed of the TiC based particles and is sintered, thus making a TiC based cermet. The Ni particles of the particle mixture may be substituted with Ni-Mo particles. In addition, the method may further comprise the steps of presintering the preform from the forming step, and intermediate-machining the presintered preform prior to finally sintering the preform, thus machining the preform more precisely. The sintering temperature preferably ranges from 1,300.degree. C. to 1,400.degree. C. In the method of this invention, the TiC particles are made through the reaction milling process, thus reducing the production cost while making the TiC based cermets.
    Type: Grant
    Filed: May 28, 1999
    Date of Patent: October 3, 2000
    Assignee: Korea Institute of Machinery & Materials
    Inventor: Chul Jin Choi
  • Patent number: 6093232
    Abstract: The present invention includes iron-carbon compacts and a process for making them. The process includes preparing a slurry comprising iron powder, furfuryl alcohol, and a polymerization catalyst for initiating the polymerization of the furfuryl alcohol into a resin, and heating the slurry to convert the alcohol into the resin. The resulting mixture is pressed into a green body and heated to form the iron-carbon compact. The compact can be used as, or machined into, a magnetic flux concentrator for an induction heating apparatus.
    Type: Grant
    Filed: March 9, 1999
    Date of Patent: July 25, 2000
    Assignee: The Regents of the University of California
    Inventor: Haskell Sheinberg
  • Patent number: 6090343
    Abstract: A method for fabricating a triphasic composite such as a WC/Co/diamond composite with a high volume fraction of diamond in a WC/Co matrix. The method involves sintering of a WC/Co powder compact to develop a porous preform, which displays some rigidity and strength, infiltrating the porous preform with a controlled distribution of carbon, and high pressure/high temperature treatment of the carbon-containing WC/Co preform to transform the carbon to diamond. The distribution of diamond in the composite can be functionally graded to provide a WC/Co core and a diamond-enriched surface, wherein all three phases form an interconnected structure in three dimensions. Such a tricontinuous structure combines high strength and toughness with superior wear resistance, making it attractive for applications in machine tools and drill bits.
    Type: Grant
    Filed: March 25, 1998
    Date of Patent: July 18, 2000
    Assignee: Rutgers University
    Inventors: Bernard H. Kear, Rajendra K. Sadangi, Larry E. McCandlish, Oleg Voronov
  • Patent number: 6033788
    Abstract: In a process for producing powder metallurgy objects containing two or more individually formed pieces, the individual formed pieces or powder compacts which are comprised of powder and a binder are joined together. A polymer compatible with the binder is sandwiched between two such powder compacts. A lamination joint is formed. The polymer is then softened, and a resultant aggregate body is thermally processed to remove the binder and polymer. The resulting object has no residual interface between the original individually formed pieces. There is no discernable boundary at the lamination joint. The final part is homogeneous and uniform with no foreign material or structural imperfections at the joint.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: March 7, 2000
    Assignee: Case Western Reserve University
    Inventors: James D. Cawley, William H. Glime, Brian D. Kernan