Patents by Inventor Kiyoshi Furushima
Kiyoshi Furushima has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11389869Abstract: A cylinder for a molding machine comprising a HIP-sintered lining layer on an inner surface of a cylindrical steel body, the lining layer comprising 38-70% by volume of tungsten carbide particles having a median diameter d50 of 1-7 ?m and a matrix composed of an Ni-based alloy, and the maximum length of the matrix in an arbitrary cross section being 12 ?m or less.Type: GrantFiled: August 31, 2018Date of Patent: July 19, 2022Assignee: HITACHI METALS, LTD.Inventors: Takayuki Segawa, Kiyoshi Furushima
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Publication number: 20200222980Abstract: A cylinder for a molding machine comprising a HIP-sintered lining layer on an inner surface of a cylindrical steel body, the lining layer comprising 38-70% by volume of tungsten carbide particles having a median diameter d50 of 1-7 ?m and a matrix composed of an Ni-based alloy, and the maximum length of the matrix in an arbitrary cross section being 12 ?m or less.Type: ApplicationFiled: August 31, 2018Publication date: July 16, 2020Applicant: HIACHI METALS, LTD.Inventors: Takayuki SEGAWA, Kiyoshi FURUSHIMA
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Patent number: 10376952Abstract: A molding machine cylinder comprising a lining layer having a structure comprising 20-50% by area of tungsten carbide particles and 1-10% by area of tungsten-based metal carboboride particles in a nickel-based alloy matrix, and containing 1-7.5% by mass of Fe, can be produced by a centrifugal casting method comprising a first step of heating at higher than 1140° C. and lower than 1200° C., and a second step of heating at 1080-1140° C. after melting the raw material powder.Type: GrantFiled: February 25, 2015Date of Patent: August 13, 2019Assignee: HITACHI METALS, LTD.Inventors: Masatsugu Uchida, Kiyoshi Furushima
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Patent number: 10300527Abstract: A molding machine cylinder comprising a lining layer having a structure comprising 20-50% by area of tungsten carbide particles and 1-10% by area of tungsten-based metal carboboride particles in a nickel-based alloy matrix, and containing 1-7.5% by mass of Fe, can be produced by a centrifugal casting method comprising a first step of heating at higher than 1140° C. and lower than 1200° C., and a second step of heating at 1080-1140° C. after melting the raw material powder.Type: GrantFiled: March 1, 2018Date of Patent: May 28, 2019Assignee: HITACHI METALS, LTD.Inventors: Masatsugu Uchida, Kiyoshi Furushima
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Publication number: 20180193904Abstract: A molding machine cylinder comprising a lining layer having a structure comprising 20-50% by area of tungsten carbide particles and 1-10% by area of tungsten-based metal carboboride particles in a nickel-based alloy matrix, and containing 1-7.5% by mass of Fe, can be produced by a centrifugal casting method comprising a first step of heating at higher than 1140° C. and lower than 1200° C., and a second step of heating at 1080-1140° C. after melting the raw material powder.Type: ApplicationFiled: March 1, 2018Publication date: July 12, 2018Applicant: HITACHI METALS, LTD.Inventors: Masatsugu UCHIDA, Kiyoshi FURUSHIMA
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Publication number: 20170008077Abstract: A molding machine cylinder comprising a lining layer having a structure comprising 20-50% by area of tungsten carbide particles and 1-10% by area of tungsten-based metal carboboride particles in a nickel-based alloy matrix, and containing 1-7.5% by mass of Fe, can be produced by a centrifugal casting method comprising a first step of heating at higher than 1140° C. and lower than 1200° C., and a second step of heating at 1080-1140° C. after melting the raw material powder.Type: ApplicationFiled: February 25, 2015Publication date: January 12, 2017Applicant: HITACHI METALS, LTD.Inventors: Masatsugu UCHIDA, Kiyoshi FURUSHIMA
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Patent number: 8308622Abstract: A centrifugally cast composite roll comprising an outer layer having a composition comprising by mass 2.5-9% of C, 0.1-3.5% of Si, 0.1-3.5% of Mn, and 11-40% of V, the balance being Fe and inevitable impurities; an intermediate layer made of a high-speed steel alloy, which is formed inside the outer layer; and an inner layer made of cast iron or steel, which is formed inside the intermediate layer.Type: GrantFiled: March 13, 2006Date of Patent: November 13, 2012Assignee: Hitachi Metals, Ltd.Inventors: Kiyoshi Furushima, Shunji Matsumoto, Ryota Honda, Kiyoshi Hayashi, Takashi Honda, Masatsugu Uchida, Seiji Oyama, Takuya Osue
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Patent number: 8156651Abstract: A method for producing an outer layer for a roll having a structure having MC carbide dispersed at an area ratio of 20-60%, comprising the steps of (1) centrifugally casting a melt having a composition comprising, by mass, 2.2-6.0% of C, 0.1-3.5% of Si, 0.1-3.5% of Mn, and 8-22% of V, the balance being Fe and inevitable impurity elements, to produce a cylindrical body comprising an inner layer having concentration MC carbide, an MC-carbide-poor outer layer, and a concentration gradient layer between the inner layer and the outer layer, in which the area ratio of MC carbide changes, and (2) cutting the cylindrical body to a depth at which the area ratio of MC carbide is 20% or more.Type: GrantFiled: September 13, 2005Date of Patent: April 17, 2012Assignee: Hitachi Metals, Ltd.Inventors: Kiyoshi Furushima, Shunji Matsumoto, Ryota Honda, Kiyoshi Hayashi, Takashi Honda, Masatsugu Uchida
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Publication number: 20090092852Abstract: A centrifugally cast composite roll comprising an outer layer having a composition comprising by mass 2.5-9% of C, 0.1-3.5% of Si, 0.1-3.5% of Mn, and 11-40% of V, the balance being Fe and inevitable impurities; an intermediate layer made of a high-speed steel alloy, which is formed inside the outer layer; and an inner layer made of cast iron or steel, which is formed inside the intermediate layer.Type: ApplicationFiled: March 13, 2006Publication date: April 9, 2009Applicant: Hitachi Metals, Ltd.Inventors: Kiyoshi Furushima, Shunji Matsumoto, Ryota Honda, Kiyoshi Hayashi, Takashi Honda, Masatsugu Uchida, Seiji Oyama, Takuya Osue
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Publication number: 20080226936Abstract: A method for producing an outer layer for a roll having a structure having MC carbide dispersed at an area ratio of 20-60%, comprising the steps of (1) centrifugally casting a melt having a composition comprising, by mass, 2.2-6.0% of C, 0.1-3.5% of Si, 0.1-3.5% of Mn, and 8-22% of V, the balance being Fe and inevitable impurity elements, to produce a cylindrical body comprising an inner layer having concentration MC carbide, an MC-carbide-poor outer layer, and a concentration gradient layer between the inner layer and the outer layer, in which the area ratio of MC carbide changes, and (2) cutting the cylindrical body to a depth at which the area ratio of MC carbide is 20% or more.Type: ApplicationFiled: September 13, 2002Publication date: September 18, 2008Applicant: Hitachi Metals, Ltd.Inventors: Kiyoshi Furushima, Shunji Matsumoto, Ryota Honda, Kiyoshi Hayashi, Takashi Honda, Masatsugu Uchida
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Patent number: 5419284Abstract: A waste heat recovery method can provide heat recovery from exhaust gases, full firing of exhaust gases, and auxiliary burning, either simultaneously or independently. Such method is carried out by installing a tube-nested (or heat-absorbing water tube furnace-inserted type) combustion chamber in a boiler of a cogeneration system or combined cycle system or the like which generates both heat and power. The boiler is provided with a combined full firing burner and auxiliary burner confronted by the exhaust gas entrance. This structure allows for elimination of a separate auxiliary chamber and thus has made it possible to provide a waste heat boiler of a simplified structure which is smaller in size and thus occupies less space, at a reduced price and with a greatly expanded heat-to-electricity ratio. Accordingly, the boiler of the invention has a greatly extended range of applications.Type: GrantFiled: November 24, 1993Date of Patent: May 30, 1995Assignee: Hirakawa Guidom CorporationInventors: Hiroshi Kobayashi, Yoshiharu Ueda, Masamichi Yamamoto, Keiryo Tou, Seikan Ishigai, Sentaro Miura, Kiyoshi Furushima
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Patent number: 5305522Abstract: The compound roll comprising a shell portion made of a hard cast iron having excellent wear resistance and resistance to surface roughening and a core portion made of a tough cast iron or cast steel, the cast iron of the shell portion having a composition consisting essentially, by weight ratio, of 2.5-3.5% of C, 0.5-1.5% of Si, 0.5-1.5% of Mn, 0.1% or less of P, 0.05% or less of S, 3.0-5.0% of Ni, 1.0-2.5% of Cr, 0.1-1.5% of Mo and balance Fe and inevitable impurities, an average diameter of primary precipitated particles constituting a matrix of the metal structure of the shell portion being 80 .mu.m or less in a range from a surface to a depth of 50 mm when determined by an image analysis method on the primary precipitated particles having diameters exceeding 30 .mu.m, and the primary precipitated particles satisfying the formula: m.sub.2 .ltoreq.1.2 m.sub.1, wherein m.sub.1 is an average diameter of the primary precipitated particles at the surface of the shell portion, and m.sub.Type: GrantFiled: March 6, 1992Date of Patent: April 26, 1994Assignee: Hitachi Metals, Ltd.Inventors: Ryosaku Nawata, Kiyoshi Furushima, Kenji Date
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Patent number: 5303544Abstract: With a view toward solving various problems of prior-art gas turbine plants by applying a tube-nested combustion chamber type combustor in place of the combustor of the prior-art gas turbine, a combustor of a gas turbine used in a gas turbine power plant is equipped with a heat-absorber-water-tube-inserted combustion chamber in which fuel is burnt with combustion air only. Consequently, the NO.sub.x generated from the gas turbine power plant is notably reduced, no CO and unburnt hydrocarbons (UHC) are produced and, moreover, the amount of power generated and the utilizable calories of the steam are increased for the benefit of an enhanced overall heat efficiency. This enables the combustion space of the gas turbine power plant to be greatly diminished, with a resultant widened utilization range of gas turbines.Type: GrantFiled: July 30, 1992Date of Patent: April 19, 1994Assignee: Hirakawa Guidom CorporationInventors: Hiroshi Kobayashi, Yoshiharu Ueda, Masamichi Yamamoto, Keiryo Tou, Seikan Ishigai, Sentaro Miura, Kiyoshi Furushima
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Patent number: 5010946Abstract: The die casting cylinder includes an outer cylindrical member made of a metal and a ceramic inner cylindrical member, in a boundary between which a plurality of voids are provided. The voids are preferably grooves provided in an inner surface of the outer cylindrical member of in an outer surface of the inner cylindrical member, with a width "a" and a distance "b" satisfying an a/b ratio of 1:1-6:1.Type: GrantFiled: June 6, 1989Date of Patent: April 30, 1991Assignee: Hitachi Metals, Ltd.Inventors: Shingo Nogami, Toshinori Yashiro, Toshio Okitsu, Kiyoshi Furushima, Itsuo Korenaga
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Patent number: 4796671Abstract: A protective tube for a thermocouple for measuring the temperature of molten metal, comprising two layers, an inner layer being made of a silicon nitride or sialon ceramic having a bending strength of 50 kg/mm.sup.2 or more, a density of 90% or more based on a theoretical density and a thermal shock temperature .DELTA.T of 400.degree. C. or more, and an outer layer being formed on the silicon nitride or sialon ceramic and containing BN and SiO.sub.2. The silicon nitride of sialon ceramic comprises 70 weight % or more of Si.sub.3 N.sub.4 having 65 weight % or more of an .alpha.-phase content, 20 weight % or less of one or more oxides of elements of Group IIIa of the Periodic Table, 20 weight % or less of Al.sub.2 O.sub.3, and optionally 15 weight % or less of AlN or AlN solid solution, and the outer layer is composed mainly of BN-SiO.sub.2 -Al.sub.2 O.sub.3 -Y.sub.2 O.sub.3. This protective tube is produced by coating ceramic powder comprising BN and SiO.sub.2 before sintering.Type: GrantFiled: March 17, 1987Date of Patent: January 10, 1989Assignee: Hitachi Metals, Ltd.Inventors: Kiyoshi Furushima, Kazunori Haratoh, Hideshige Matsuo