Patents Assigned to Kiyohito ISHIDA
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Publication number: 20080124240Abstract: Provided is free cutting alloy excellent in machinability, preserving various characteristics as alloy. The free cutting alloy contains: one or more of Ti and Zr as a metal element component; and C being an indispensable element as a bonding component with the metal element component, wherein a (Ti,Zr) based compound including one or more of S, Se and Te is formed in a matrix metal phase. The free cutting alloy is more excellent in machinability, preserving various characteristics as alloy at similar levels to a conventional case. The effect is especially conspicuous, for example, when a compound expressed in a chemical form of (Ti,Zr)4C2(S,Se,Te)2 as the (Ti,Zr) based compound is formed at least in a dispersed state in the alloy structure.Type: ApplicationFiled: October 19, 2007Publication date: May 29, 2008Applicants: Kiyohito ISHIDA, Katsunari OIKAWA, Daido Steel Co., Ltd., Tohoku Steel Co., Ltd., Japan Industrial Technology Association, Tohoku Techno Arch Co., Ltd.Inventors: Kiyohito Ishida, Katsunari Oikawa, Takashi Ebata, Takayuki Inoguchi, Tetsuya Shimizu, Michio Okabe
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Publication number: 20060124203Abstract: A continuous vacuum carburizing process carburizes material such as a steel wire 7 with a carbon content equal to or less than a desired carbon content by passing it under reduced pressure continuously through a carburizing atmosphere 5 with constant pressure and constant gas composition. A continuous vacuum carburizing apparatus for carrying out this process has at least one furnace core tube 1, 11, or 12 and a feeding/taking-up mechanism 13, 14 for the steel wire 7 in a vacuum container 1. Carburizing medium gas is supplied to the furnace core tube 1 via pipes 2, 4 to form the carburizing atmosphere 5. A heater 10 heats the furnace core tube 1, thereby activating carbon of the carburizing medium gas. In this way, material having a small thickness of, for example, 0.02 mm to 3 mm is carburized with less variation in the amount of carburization and no surface oxidation or sooting.Type: ApplicationFiled: June 3, 2004Publication date: June 15, 2006Applicants: Nachi-Fujikoshi Corp, Kiyohito IshidaInventors: Kiyohito Ishida, Hirokuni Amano, Yasushi Hara, Tetsushi Machi
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Publication number: 20050016642Abstract: A shape memory alloy comprises Co, Ni and Al with a two-phase structure comprising a ?-phase having a B2 structure and a ?-phase having an fcc structure, at least 40% by area of crystal grain boundaries of the ?-phase being occupied by the ?-phase. The shape memory alloy can be produced by a first heat treatment step comprising heating at 1200 to 1350° C. for 0.1 to 50 hours and cooling at 0.1 to 1000° C./minute, and a second heat treatment step comprising heating at 1000 to 1320° C. for 0.1 to 50 hours and cooling at 10 to 10000° C./minute.Type: ApplicationFiled: March 18, 2004Publication date: January 27, 2005Applicants: Honda Motor Co., Ltd., Kiyohito Ishida, National Institute of Advanced Industrial Science and TechnologyInventors: Katsunari Oikawa, Kiyohito Ishida, Ryosuke Kainuma, Yuuki Tanaka, Masahiro Ohta, Toru Sukigara
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Publication number: 20050011589Abstract: Provided is free cutting alloy excellent in machinability, preserving various characteristics as alloy. The free cutting alloy contains: one or more of Ti and Zr as a metal element component; and C being an indispensable element as a bonding component with the metal element component, wherein a (Ti,Zr) based compound including one or more of S, Se and Te is formed in a matrix metal phase. The free cutting alloy is more excellent in machinability, preserving various characteristics as alloy at similar levels to a conventional case. The effect is especially conspicuous, for example, when a compound expressed in a chemical form of (Ti,Zr)4C2(S,Se,Te)2 as the (Ti,Zr) based compound is formed at least in a dispersed state in the alloy structure.Type: ApplicationFiled: May 18, 2004Publication date: January 20, 2005Applicants: Kiyohito Ishida, Katsunari Oikawa, Daido Tokushuko Kabushiki Kaisha, Tohoku Tokushuko Kabushiki Kaisha, Japan Industrial Technology Association, Tohoku Technoarch Co., Ltd.Inventors: Kiyohito Ishida, Katsunari Oikawa, Takashi Ebata, Takayuki Inoguchi, Tetsuya Shimizu, Michio Okabe
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Publication number: 20050000602Abstract: Provided is free cutting alloy excellent in machinability, preserving various characteristics as alloy. The free cutting alloy contains: one or more of Ti and Zr as a metal element component; and C being an indispensable element as a bonding component with the metal element component, wherein a (Ti,Zr) based compound including one or more of S, Se and Te is formed in a matrix metal phase. The free cutting alloy is more excellent in machinability, preserving various characteristics as alloy at similar levels to a conventional case. The effect is especially conspicuous, for example, when a compound expressed in a chemical form of (Ti,Zr)4C2(S,Se,Te)2 as the (Ti,Zr) based compound is formed at least in a dispersed state in the alloy structure.Type: ApplicationFiled: May 18, 2004Publication date: January 6, 2005Applicants: Kiyohito ISHIDA, Katsunari OIKAWA, Daido Tokushuko Kabushiki Kaisha, Tohoku Tokushuko Kabushiki Kaisha, Japan Industrial Technology Association, Tohoku Technoarch Co., Ltd.Inventors: Kiyohito Ishida, Katsunari Oikawa, Takashi Ebata, Tetsuya Shimizu, Michio Okabe
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Publication number: 20030170138Abstract: Provided is free cutting alloy excellent in machinability, preserving various characteristics as alloy. The free cutting alloy contains: one or more of Ti and Zr as a metal element component; and C being an indispensable element as a bonding component with the metal element component, wherein a (Ti, Zr) based compound including one or more of S, Se and Te is formed in a matrix metal phase. The free cutting alloy is more excellent in machinability, preserving various characteristics as alloy at similar levels to a conventional case. The effect is especially conspicuous, for example, when a compound expressed in a chemical form of (Ti, Zr)4C2(S, Se, Te)2 as the (Ti, Zr) based compound is formed at least in a dispersed state in the alloy structure.Type: ApplicationFiled: September 13, 2002Publication date: September 11, 2003Applicant: Kiyohito ISHIDAInventors: Kiyohito Ishida, Katsunari Oikawa, Takashi Ebata, Takayuki Inoguchi, Tetsuya Shimizu, Michio Okabe
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Publication number: 20030066577Abstract: A free-cutting tool steel is provided containing Fe and C in an amount of 0.1 to 2.5 wt %, Ti and or Zr where WTi+0.52WZr constitutes 0.03 to 3.5 wt %, and WTi represents Ti content and WZr represents Zr content, at least any one of S, Se and Te where WS+0.4WSe+0.25WTe constitutes 0.01 to 1.0 wt %, and (WTi+0.52WZr)/(WS+0.4WSe+0.25WTe) constitutes 1 to 4, and WS represents S content, WSe represents Se content and WTe represents Te content; and dispersed therein a texture thereof from 0.1 to 10% in terms of area ratio in a section of a machinability improving compound phase of a metallic element component of Ti and/or Zr as major components, and a binding component for the metallic element component containing C and any one of S, Se and Te.Type: ApplicationFiled: February 28, 2002Publication date: April 10, 2003Applicant: Kiyohito Ishida, Dokuritsu Gyousei Houjin Sangyo Gijutsu Sougo, Kenkyusho, Katsunari OikawaInventors: Kiyohito Ishida, Katsunari Oikawa, Toshimitsu Fujii, Yukinori Matsuda, Kozo Ozaki, Seiji Kurata, Takayuki Shimizu