大学院理工学研究科（工）
理工学専攻（機械工学）
English
更新日：2025/01/03
教授
ﾄﾖﾀ　ﾋﾛﾐﾁ
豊田　洋通

経歴

  1. 1989-2004愛媛大学工学部機械工学科Faculty of Engineering, Department of Mechanical Engineering
  2. 2004-現在- 愛媛大学工学部機械工学科

学位

  1. 博士（工学）大阪大学2000/04

研究分野

  1. ものづくり技術（機械・電気電子・化学工学）加工学、生産工学

研究キーワード

  1. in-liquid plasma
  2. Diamond synthesis
  3. 液中プラズマ
  4. ダイヤモンド合成

共同研究・競争的資金等の研究課題

  1. 愛媛大学イオンビーム・プラズマ援用超微粒子加速衝撃法によるダイヤモンド状膜の形成基盤研究(C)
  2. 愛媛大学異種超微粒子の静電高速衝撃によるナノスケール混合組織薄膜の創製基盤研究(B)
  3. 愛媛大学ソノプラズマによる単結晶ダイヤモンドの形成萌芽研究
  4. 愛媛大学液中プラズマによる半導体結晶の高速合成基盤研究(C)
  5. 愛媛大学水中プラズマの基礎物性と応用技術萌芽研究
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書籍等出版物

  1. 大気圧プラズマの生成制御と応用技術小駒 益弘サイエンス&テクノロジー2012/039784864280396
  2. レアメタル便覧丸善2010
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論文

  1. Low Tool Wear Cutting Method Using H2O Radical2023/12/20Hiromichi Toyota Ryoya Shiraishi Hidekazu Goto Xia Zhu Yukiharu Iwamoto Syoma TamuraSolid State Phenomena354, 15-23研究論文（学術雑誌）10.4028/p-u3uhmvTrans Tech Publications, Ltd.<jats:p>Tool wear is an important problem when cutting hard-to-cut materials such as stainless steel and nickel alloys. This unignorable disadvantage is caused by the diffusion of dissociated carbon atoms to the surface layer of the tool tip during the cutting process, and this has been confirmed by SEM/EDS analysis of worn tool tips. In this study, a novel cutting method is proposed in which chemically activated H<jats:sub>2</jats:sub>O molecules are introduced to the cutting tool tip in order to prevent tool wear by removing dissociated carbon atoms on the surface layer of the tool tip. In cutting experiments, stainless steel X5CrNi 18-10 (JIS SUS304), a cemented carbide tool tip, cutting oil, steam, and Ar plasma were used. Ar plasma was used for raising the steam temperature around the tool tip and chemically activating H<jats:sub>2</jats:sub>O molecules. From the results, the dissociated carbon and constituted knife edge were mostly removed by H<jats:sub>2</jats:sub>O steam and cutting oil without Ar plasma. However, in some cases using Ar plasma, the workpiece melted and tightly adhered to the cutting face of the tool tip. This suggests that the H<jats:sub>2</jats:sub>O steam temperature should be suitably controlled so as to remove carbon atoms effectively from the cutting face of the tool tip.</jats:p>
  2. Effect of Mechanically Created Pits Pattern for Direct Diamond Deposition on Stainless-Steel Surface2023/12/20Ryoya Shiraishi Hiromichi Toyota Hidekazu Goto Xia Zhu Yukiharu Iwamoto Kosuke OkamotoSolid State Phenomena354, 3-14研究論文（学術雑誌）10.4028/p-vf0nzlTrans Tech Publications, Ltd.<jats:p>Direct diamond deposition on a steel surface has been considered very difficult. Recently, we found that high-quality diamond films can be deposited on the surface of stainless-steel X5CrNi 18-10 by drilling multiple regularly arranged pits without interlayers or seeding. The following two hypotheses (A) and (B) can be considered as the reason why a high-quality diamond film can be deposited: (A) unoxidized Cr and Ni exposed to the stainless-steel X5CrNi 18-10 surface prevent carbon diffusion into interior of the stainless-steel, resulting diamond core generation, (B) Surface geometry with regular roughness contributes to stress relaxation and delamination prevention. In the present study, those hypotheses have been examined by quantum chemistry calculation and experimental. For the quantum chemistry calculation, energy barrier and kinetic energy for a carbon atom intrudes into a model cluster has been calculated with an ab-initio computational chemistry software package, Gaussian. The calculation result has supported hypothesis (A). For the experiment, X5CrNi 18-10 stainless-steel substrates with different surface characteristics are prepared by using various mechanical machining methods and used in the direct deposition process for diamond with in-liquid plasma CVD. The experimental result has supported both hypothesis (A) and (B).</jats:p>
  3. A New Diamond Chemical Vapor Deposition Method on Steel Surface2022/08Ryoya Shiraishi Hiromichi Toyota Xia Zhu Kengo Matsumoto Shinfuku Nomura Yukiharu IwamotoJOURNAL OF THE JAPAN INSTITUTE OF ENERGY101/ 8, 147-151研究論文（学術雑誌）10.3775/jie.101.147URLURL_2JAPAN INST ENERGYSteel coated with diamond film is excellent material specifically for cutting tools. However, direct diamond deposition has been considered difficult. In the present study, a stainless steel surface was mechanically processed to directly deposit diamond on it. Diamond film was rarely obtained when the steel surface was rasped with sandpaper, metal file, or ground with a flat drill. In most cases, amorphous carbon was deposited on the surface. On the other hand, high-quality diamond was often deposited when regularly arranged pits were created on the surface using a drill. In this case, the diamond was deposited on the lips of the pits and the flat (nonprocessed) areas between (rather than on the inside of) the pits. The quality of diamond film obtained in the present work is the best reported for direct diamond chemical vapor deposition (CVD) on steel. It is an important discovery that high-quality diamond film can be directly deposited on steel surfaces via simple mechanical surface processing without interlayer or seeding.
  4. Structural Design for Improving the Strength of Flat Wooden Pallets2022X. Zhu H. Toyota D. Ito K. DoiJournal of Physics: Conference Series2287/ 1研究論文（学術雑誌）10.1088/1742-6596/2287/1/012043The purpose of this study is to develop a new pallet structure using the inexpensive hinoki wood, which is produced in the Ehime Prefecture, having the same strength as the conventional Oregon pine wood. A new pallet structure was proposed for achieving high-strength by improving the flexural stiffness and compressive stiffness and achieving high-cost performance by using the inexpensive hinoki wood. The results obtained in this study are summarized as follows: deflection of the new type is reduced compared to the standard type, due to the increased bending rigidity of the edge board and deck board; compressive displacement of the new model decreases, as the compressive stiffness of the pallet legs increases; new mold pattern 6 made is higher in strength and rigidity than the standard mold; cost of the new type #6 is 72% of that of the standard type pallet, and cost can be reduced by 28%.
  5. 液中プラズマCVD法による単結晶ダイヤモンド合成に関する基礎研究2022岡本孝祐 豊田洋通 朱霞日本材料学会四国支部学術講演会講演論文集19th (Web)
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講演・口頭発表等

  1. 木製パレット構造設計に関する基礎研究日本材料学会四国支部学術講演会講演論文集2022/04/23口頭発表（一般）
  2. 液中プラズマCVD法による単結晶ダイヤモンド合成に関する基礎研究日本材料学会四国支部学術講演会講演論文集2022/04/23口頭発表（一般）
  3. 回転引き曲げ加工における加工精度を向上させるための加工パラメータの最適化日本材料学会四国支部学術講演会講演論文集2021口頭発表（一般）
  4. Chemical structure and adhesion of DLC film with amorphous SiC intermediate thin filmProceedings of The 10th International Conference on Computational Methods2019/07口頭発表（一般）
  5. Catalytic Effect on Ultrasonic Decomposition of Cellulose超音波エレクトロニクスの基礎と応用に関するシンポジウム(CD-ROM)2017/10口頭発表（一般）URL
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Works(作品等)

  1. 液中プラズマによるカーボンナノチューブの製造法2010-2011
  2. 液中プラズマによるダイヤモンドの高速形成2006-2006
  3. 液中プラズマ利用技術研究32006-2006
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産業財産権

  1. 特許権SUBMERGED PLASMA GENERATOR, METHOD OF GENERATING PLASMA IN LIQUID AND METHO OF DECOMPOSING TOXIC SUBSTANCE WITH PLASMA IN LIQUID
  2. 特許権液中プラズマ発生装置，液中プラズマ発生方法および液中プラズマによる有害物質分解方法
  3. 特許権液中プラズマ発生装置，液中プラズマ発生方法および液中プラズマによる有害物質分解方法
  4. 特許権SUBMERGED PLASMA GENERATOR, METHOD OF GENERATING PLASMA IN LIQUID AND METHO OF DECOMPOSING TOXIC SUBSTANCE WITH PLASMA IN LIQUID
  5. 特許権液中プラズマ用アンテナセット，液中プラズマ発生装置および液中プラズマ発生方法
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受賞

  1. 2021/11学長賞地域連携活動においての顕著な功績
  2. 2019/08教育貢献賞効果的な講義方法について
  3. 2008日本機械学会中国四国支部賞 技術創造賞
  4. 2008市村学術賞 貢献賞
  5. 2008愛媛大学工学部機械工学科授業改善貢献賞
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担当授業科目

  1. 2024ものづくり工学特論１（機械工学特別講義１）
  2. 2024ものづくり工学特論２（機械工学特別講義２）
  3. 2024機械製作実習
  4. 2024機械製作実習
  5. 2024生産システム学特論Ⅵ
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所属学協会

  1. 精密工学会
  2. ニューダイヤモンドフォーラム
  3. 日本機械学会
  4. 日本伝熱学会
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委員歴

  1. 2016/04-2017/03日本機械学会中国四国支部 商議員
  2. 2015/04-2016/03日本機械学会中国四国支部 幹事
  3. 2007/04-現在精密工学会中国四国支部 幹事／商議員
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