Patents by Inventor Masahide Kawabata
Masahide Kawabata 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: 11173544Abstract: A casting apparatus for producing a casting by pouring a metal melt into a gas-permeable casting mold by gravity, comprising: a gas-permeable casting mold comprising a cavity including a sprue composed of a tubular portion and a cup portion having a larger diameter than that of the tubular portion to receive the metal melt, a runner constituting a flow path of the metal melt supplied through the sprue, and a product-forming cavity to be filled with the metal melt sent through the runner; a means for pouring the metal melt into the sprue by gravity; a gas-blowing unit comprising a gas-ejecting member to be connected to the sprue; and a mechanism for moving the gas-ejecting member; the gas-ejecting-member-moving mechanism placing the gas-ejecting member at a position just above the tubular portion and not interfering with gravity pouring of the metal melt, and moving it downward for connection to the tubular portion; the gas-blowing unit having blowing a gas to fill the product-forming cavity with the metal melType: GrantFiled: February 25, 2021Date of Patent: November 16, 2021Assignee: HITACHI METALS, LTD.Inventors: Masahide Kawabata, Toru Iwanaga, Kiyoshi Suehara, Yutaka Morita, Masafumi Kokubo
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Publication number: 20210178463Abstract: A casting apparatus for producing a casting by pouring a metal melt into a gas-permeable casting mold by gravity, comprising: a gas-permeable casting mold comprising a cavity including a sprue composed of a tubular portion and a cup portion having a larger diameter than that of the tubular portion to receive the metal melt, a runner constituting a flow path of the metal melt supplied through the sprue, and a product-forming cavity to be filled with the metal melt sent through the runner; a means for pouring the metal melt into the sprue by gravity; a gas-blowing unit comprising a gas-ejecting member to be connected to the sprue; and a mechanism for moving the gas-ejecting member; the gas-ejecting-member-moving mechanism placing the gas-ejecting member at a position just above the tubular portion and not interfering with gravity pouring of the metal melt, and moving it downward for connection to the tubular portion; the gas-blowing unit having blowing a gas to fill the product-forming cavity with the metal melType: ApplicationFiled: February 25, 2021Publication date: June 17, 2021Applicant: HITACHI METALS, LTD.Inventors: Masahide KAWABATA, Toru IWANAGA, Kiyoshi SUEHARA, Yutaka MORITA, Masafumi KOKUBO
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Publication number: 20190055631Abstract: There is provided with spheroidal graphite cast iron having excellent gas defect resistance where gas defects such as pinholes attributable to the free N are small in number and having mechanical characteristics and machinability equal to or greater than the conventional ones. The spheroidal graphite cast iron consists of, in mass ratio, C: 3.3 to 4%; Si: 2 to 3%; P: not more than 0.05%; S: not more than 0.02%; Mn: not more than 0.8%; Cu: not more than 0.8% (0 is not included); Mg: 0.02 to 0.06%; Ti: 0.01 to 0.04%; V: 0.001 to 0.01%; Nb: 0.001 to 0.01%; and N: 0.004 to 0.008%, with the remnant substantially consisting of Fe and an inevitable impurity.Type: ApplicationFiled: February 29, 2016Publication date: February 21, 2019Inventors: Masahide Kawabata, Hideya Yamane
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Patent number: 10087509Abstract: A spheroidal graphite cast iron having (a) a composition comprising by mass 3.4-4% of C, 1.9-2.8% of Si, 0.02-0.06% of Mg, 0.2-1% of Mn, 0.2-2% of Cu, 0-0.1% of Sn, 0.85-3% of (Mn+Cu+10×Sn), 0.05% or less of P, and 0.02% or less of S, the balance being Fe and inevitable impurities, and (b) a duplex matrix structure comprising by area 2-40% of fine ferrite phases and 60-98% of fine pearlite phases, the maximum length of the ferrite phases being 300 ?m or less, and (c) the pearlite phases being formed around graphite particles dispersed in the duplex matrix structure.Type: GrantFiled: December 28, 2012Date of Patent: October 2, 2018Assignee: HITACHI METALS, LTD.Inventors: Lin Wang, Masahide Kawabata, Kentaro Fukumoto
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Publication number: 20180178279Abstract: A casting apparatus for producing a casting by pouring a metal melt into a gas-permeable casting mold by gravity, comprising: a gas-permeable casting mold comprising a cavity including a sprue composed of a tubular portion and a cup portion having a larger diameter than that of the tubular portion to receive the metal melt, a runner constituting a flow path of the metal melt supplied through the sprue, and a product-forming cavity to be filled with the metal melt sent through the runner; a means for pouring the metal melt into the sprue by gravity; a gas-blowing unit comprising a gas-ejecting member to be connected to the sprue; and a mechanism for moving the gas-ejecting member; the gas-ejecting-member-moving mechanism placing the gas-ejecting member at a position just above the tubular portion and not interfering with gravity pouring of the metal melt, and moving it downward for connection to the tubular portion; the gas-blowing unit having blowing a gas to fill the product-forming cavity with the metal melType: ApplicationFiled: February 23, 2018Publication date: June 28, 2018Applicant: HITACHI METALS, LTD.Inventors: Masahide KAWABATA, Toru IWANAGA, Kiyoshi SUEHARA, Yutaka MORITA, Masafumi KOKUBO
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Patent number: 9950363Abstract: A casting apparatus for producing a casting by pouring a metal melt into a gas-permeable casting mold by gravity, comprising: a gas-permeable casting mold comprising a cavity including a sprue composed of a tubular portion and a cup portion having a larger diameter than that of the tubular portion to receive the metal melt, a runner constituting a flow path of the metal melt supplied through the sprue, and a product-forming cavity to be filled with the metal melt sent through the runner; a means for pouring the metal melt into the sprue by gravity; a gas-blowing unit comprising a gas-ejecting member to be connected to the sprue; and a mechanism for moving the gas-ejecting member; the gas-ejecting-member-moving mechanism placing the gas-ejecting member at a position just above the tubular portion and not interfering with gravity pouring of the metal melt, and moving it downward for connection to the tubular portion; the gas-blowing unit having blowing a gas to fill the product-forming cavity with the metal melType: GrantFiled: September 30, 2014Date of Patent: April 24, 2018Assignee: HITACHI METALS, LTD.Inventors: Masahide Kawabata, Toru Iwanaga, Kiyoshi Suehara, Yutaka Morita, Masafumi Kokubo
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Heat-resistant, austenitic cast steel having excellent machinability and exhaust member made thereof
Patent number: 9765678Abstract: A heat-resistant, austenitic cast steel having excellent machinability comprising by mass 0.4-0.55% of C, 1-2% of Si, 0.5-1.5% of Mn, 18-27% of Cr, 8-22% of Ni, 1.5-2.5% of Nb, 0.01-0.3% of N, 0.1-0.2% of S, and 0.02-0.15% of Al, the balance being Fe and inevitable impurities, a machinability index I represented by the following formula: I=100×S+75×Al+0.75×Mn?10×C?2×Nb?0.25×Cr?0.15×Ni?1.2×N, wherein each element symbol represents % by mass of each element in the cast steel, meeting the condition of ?3.0?I?+14.0, and an exhaust member made thereof.Type: GrantFiled: May 9, 2013Date of Patent: September 19, 2017Assignee: HITACHI METALS, LTD.Inventors: Kana Morishita, Kenichi Inoue, Susumu Katsuragi, Masahide Kawabata, Tomonori Sakuta -
Patent number: 9758851Abstract: A heat-resistant, cast ferritic steel having excellent machinability comprising by mass 0.32-0.48% of C, 0.85% or less of Si, 0.1-2% of Mn, 1.5% or less of Ni, 16-23% of Cr, 3.2-5% of Nb, Nb/C being 9-11.5, 0.15% or less of N, 0.05-0.2% of S, and 0.01-0.08% of Al, the balance being Fe and inevitable impurities, and an exhaust member made thereof.Type: GrantFiled: October 4, 2013Date of Patent: September 12, 2017Assignee: HITACHI METALS, LTD.Inventors: Susumu Katsuragi, Masahide Kawabata, Tomonori Sakuta, Kana Morishita, Kenichi Inoue
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Patent number: 9592550Abstract: A method for producing a casting by pouring a metal melt by gravity into a gas-permeable casting mold 1 having a cavity comprising at least a sprue 6, a runner 7 and a product-forming cavity 9, comprising pouring a metal melt into a desired cavity portion 10 including the product-forming cavity through the sprue, the melt being in a volume substantially equal to the volume of the desired cavity portion; supplying a gas 14 to the desired cavity portion through the sprue before the desired cavity portion is filled with the poured melt, so that the melt fills the desired cavity portion; and cooling a portion of the melt in contact with the gas directly or indirectly by water 16 supplied from outside the gas-permeable casting mold, simultaneously with, during or after supplying the gas, thereby solidifying the melt.Type: GrantFiled: June 19, 2014Date of Patent: March 14, 2017Assignee: HITACHI METALS, LTD.Inventors: Masahide Kawabata, Lin Wang, Yoshimasa Fujii
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Publication number: 20160236274Abstract: A casting apparatus for producing a casting by pouring a metal melt into a gas-permeable casting mold by gravity, comprising: a gas-permeable casting mold comprising a cavity including a sprue composed of a tubular portion and a cup portion having a larger diameter than that of the tubular portion to receive the metal melt, a runner constituting a flow path of the metal melt supplied through the sprue, and a product-forming cavity to be filled with the metal melt sent through the runner; a means for pouring the metal melt into the sprue by gravity; a gas-blowing unit comprising a gas-ejecting member to be connected to the sprue; and a mechanism for moving the gas-ejecting member; the gas-ejecting-member-moving mechanism placing the gas-ejecting member at a position just above the tubular portion and not interfering with gravity pouring of the metal melt, and moving it downward for connection to the tubular portion; the gas-blowing unit having blowing a gas to fill the product-forming cavity with the metal melType: ApplicationFiled: September 30, 2014Publication date: August 18, 2016Applicant: HITACHI METALS, LTD.Inventors: Masahide KAWABATA, Toru IWANAGA, Kiyoshi SUEHARA, Yutaka MORITA, Masafumi KOKUBO
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Publication number: 20160144425Abstract: A method for producing a casting by pouring a metal melt by gravity into a gas-permeable casting mold 1 having a cavity comprising at least a sprue 6, a runner 7 and a product-forming cavity 9, comprising pouring a metal melt into a desired cavity portion 10 including the product-forming cavity through the sprue, the melt being in a volume substantially equal to the volume of the desired cavity portion; supplying a gas 14 to the desired cavity portion through the sprue before the desired cavity portion is filled with the poured melt, so that the melt fills the desired cavity portion; and cooling a portion of the melt in contact with the gas directly or indirectly by water 16 supplied from outside the gas-permeable casting mold, simultaneously with, during or after supplying the gas, thereby solidifying the melt.Type: ApplicationFiled: June 19, 2014Publication date: May 26, 2016Applicant: HITACHI METALS, LTD.Inventors: Masahide KAWABATA, Lin WANG, Yoshimasa FUJII
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Patent number: 9169543Abstract: Precipitation-hardened, martensitic, cast stainless steel having a composition comprising, by mass, 0.08-0.18% of C, 1.5% or less of Si, 2.0% or less of Mn, 0.005-0.4% of S, 13.5-16.5% of Cr, 3.0-5.5% of Ni, 0.5-2.8% of Cu, 1.0-2.0% of Nb, and 0.12% or less of N, the amounts of C, N and Nb meeting the condition of ?0.2?9 (C %+0.86N %)?Nb %?1.0, the rest being Fe and inevitable impurities, and having a structure in which Cu precipitates having an average particle size of 0.1-0.4 ?m are dispersed in a tempered-martensite-based matrix.Type: GrantFiled: March 21, 2008Date of Patent: October 27, 2015Assignee: HITACHI METALS, LTD.Inventors: Masahide Kawabata, Seiichi Endo, Masanori Hara, Koki Otsuka
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Publication number: 20150275344Abstract: A heat-resistant, cast ferritic steel having excellent machinability comprising by mass 0.32-0.48% of C, 0.85% or less of Si, 0.1-2% of Mn, 1.5% or less of Ni, 16-23% of Cr, 3.2-5% of Nb, Nb/C being 9-11.5, 0.15% or less of N, 0.05-0.2% of S, and 0.01-0.08% of Al, the balance being Fe and inevitable impurities, and an exhaust member made thereof.Type: ApplicationFiled: October 4, 2013Publication date: October 1, 2015Applicant: HITACHI METALS, LTD.Inventors: Susumu Katsuragi, Masahide Kawabata, Tomonori Sakuta, Kana Morishita, Kenichi Inoue
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Patent number: 9046029Abstract: A heat-resistant, ferritic cast steel having excellent melt flowability, gas defect resistance, toughness and machinability, which has a composition comprising by mass, C: 0.32-0.45%, Si: 0.85% or less, Mn: 0.15-2%, Ni: 1.5% or less, Cr: 16-23%, Nb: 3.2-4.5%, Nb/C: 9-11.5, N: 0.15% or less, S: (Nb/20?0.1) to 0.2%, W and/or Mo: 3.2% or less in total (W+Mo), the balance being Fe and inevitable impurities, and a structure in which the area ratio of a eutectic (?+NbC) phase of ? ferrite and Nb carbide (NbC) is 60-80%, and the area ratio of manganese chromium sulfide (MnCr)S is 0.2-1.2%, and an exhaust member made thereof.Type: GrantFiled: October 3, 2011Date of Patent: June 2, 2015Assignee: HITACHI METALS, LTD.Inventors: Masahide Kawabata, Hideo Kuribayashi, Junji Hayakawa
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HEAT-RESISTANT, AUSTENITIC CAST STEEL HAVING EXCELLENT MACHINABILITY AND EXHAUST MEMBER MADE THEREOF
Publication number: 20150086412Abstract: A heat-resistant, austenitic cast steel having excellent machinability comprising by mass 0.4-0.55% of C, 1-2% of Si, 0.5-1.5% of Mn, 18-27% of Cr, 8-22% of Ni, 1.5-2.5% of Nb, 0.01-0.3% of N, 0.1-0.2% of S, and 0.02-0.15% of Al, the balance being Fe and inevitable impurities, a machinability index I represented by the following formula: I=100×S+75×Al+0.75×Mn?10×C?2×Nb?0.25×Cr?0.15×Ni?1.2×N, wherein each element symbol represents % by mass of each element in the cast steel, meeting the condition of ?3.0?I?+14.0, and an exhaust member made thereof.Type: ApplicationFiled: May 9, 2013Publication date: March 26, 2015Applicant: HITACHI METALS, LTD.Inventors: Kana Morishita, Kenichi Inoue, Susumu Katsuragi, Masahide Kawabata, Tomonori Sakuta -
Publication number: 20140352851Abstract: A spheroidal graphite cast iron having (a) a composition comprising by mass 3.4-4% of C, 1.9-2.8% of Si, 0.02-0.06% of Mg, 0.2-1% of Mn, 0.2-2% of Cu, 0-0.1% of Sn, 0.85-3% of (Mn+Cu+10×Sn), 0.05% or less of P, and 0.02% or less of S, the balance being Fe and inevitable impurities, and (b) a duplex matrix structure comprising by area 2-40% of fine ferrite phases and 60-98% of fine pearlite phases, the maximum length of the ferrite phases being 300 ?m or less, and (c) the pearlite phases being formed around graphite particles dispersed in the duplex matrix structure.Type: ApplicationFiled: December 28, 2012Publication date: December 4, 2014Applicant: HITACHI METALS, LTD.Inventors: Lin Wang, Masahide Kawabata, Kentaro Fukumoto
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Patent number: 8900510Abstract: A heat-resistant, ferritic cast steel having excellent room-temperature toughness, which has a composition comprising by mass 0.32-0.48% of C, 0.85% or less of Si, 2% or less of Mn, 1.5% or less of Ni, 16-19.8% of Cr, 3.2-5% of Nb, Nb/C being 9-11.5, 0.15% or less of N, 0.002-0.2% of S, and 0.8% or less in total of W and/or Mo, the balance being Fe and inevitable impurities, and a structure in which a eutectic (?+NbC) phase formed from a ? phase and Nb carbide (NbC) has an area ratio of 60-90%, and an exhaust member made thereof.Type: GrantFiled: March 31, 2011Date of Patent: December 2, 2014Assignee: Hitachi Metals, Ltd.Inventor: Masahide Kawabata
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Publication number: 20130195713Abstract: A heat-resistant, ferritic cast steel having excellent melt flowability, gas defect resistance, toughness and machinability, which has a composition comprising by mass, C: 0.32-0.45%, Si: 0.85% or less, Mn: 0.15-2%, Ni: 1.5% or less, Cr: 16-23%, Nb: 3.2-4.5%, Nb/C: 9-11.5, N: 0.15% or less, S: (Nb/20-0.1) to 0.2%, W and/or Mo: 3.2% or less in total (W+Mo), the balance being Fe and inevitable impurities, and a structure in which the area ratio of a eutectic (?+NbC) phase of ? ferrite and Nb carbide (NbC) is 60-80%, and the area ratio of manganese chromium sulfide (MnCr)S is 0.2-1.2%, and an exhaust member made thereof.Type: ApplicationFiled: October 3, 2011Publication date: August 1, 2013Applicant: HITACHI METALS, LTD.Inventors: Masahide Kawabata, Hideo Kuribayashi, Junji Hayakawa
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Patent number: 8388889Abstract: Heat-resistant, austenitic cast steel comprising by mass 0.3-0.6% of C, 1.1-2% of Si, 1.5% or less of Mn, 17.5-22.5% of Cr, 8-13% of Ni, 1.5-4% as (W+2Mo) of at least one of W and Mo, 1-4% of Nb, 0.01-0.3% of N, 0.01-0.5% of S, the balance being Fe and inevitable impurities, and meeting the following formulae (1), (2), (3) and (4): 0.05?(C—Nb/8)?0.6??(1), 17.5?17.5Si?(W+2Mo)??(2), 5.6Si+(W+2Mo)?13.7??(3), and 0.08Si+(C—Nb/8)+0.015Cr+0.011Ni+0.03W+0.02Mo<0.96??(4), wherein the symbol of each element corresponds to the amount (% by mass) of each element in the cast steel.Type: GrantFiled: February 23, 2009Date of Patent: March 5, 2013Assignee: Hitachi Metals Ltd.Inventor: Masahide Kawabata
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Publication number: 20130022489Abstract: A heat-resistant, ferritic cast steel having excellent room-temperature toughness, which has a composition comprising by mass 0.32-0.48% of C, 0.85% or less of Si, 2% or less of Mn, 1.5% or less of Ni, 16-19.8% of Cr, 3.2-5% of Nb, Nb/C being 9-11.5, 0.15% or less of N, 0.002-0.2% of S, and 0.8% or less in total of W and/or Mo, the balance being Fe and inevitable impurities, and a structure in which a eutectic (?+NbC) phase formed from a ? phase and Nb carbide (NbC) has an area ratio of 60-90%, and an exhaust member made thereof.Type: ApplicationFiled: March 31, 2011Publication date: January 24, 2013Applicant: HITACHI METALS, LTD.Inventor: Masahide Kawabata