Updated on 2025/04/23

写真a

 
Hiroyuki Kodama
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Lecturer
Position
Lecturer
External link

Degree

  • 博士(工学) ( 2014.3   同志社大学 )

  • Ph.D. in Engineering ( 2014.3   Doshisha University )

Research Interests

  • Grinding

  • Data-mining

  • Cutting

  • Multivariate analysis

  • Machine learning

  • Data science

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Manufacturing and production engineering

Education

  • Doshisha University   大学院工学研究科博士後期課程機械工学専攻  

    2011.4 - 2014.3

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  • Doshisha University   大学院工学研究科博士前期課程機械工学専攻  

    2009.4 - 2011.3

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  • Doshisha University   工学部機械システム工学科  

    - 2009.3

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Research History

  • Okayama University   学術研究院環境生命自然科学学域   Lecturer

    2017.4

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  • University of Hyogo   Graduate School of Engineering   Assistant Professor

    2014.4 - 2017.3

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  • 日本学術振興会特別研究員   DC2

    2012.4 - 2014.3

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  • Osaka Institute of Technology

    2011.4 - 2012.3

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Committee Memberships

  • 一般社団法人 日本機械学会 生産加工工作機械部門   総務委員会幹事  

    2024.4   

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  • 公益社団法人 精密工学会中国四国支部   幹事  

    2024.4   

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  • 一般社団法人 日本機械学会 生産加工工作機械部門   総務委員会委員  

    2024.4 - 2025.3   

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    Committee type:Academic society

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  • 公益社団法人 精密工学会中国四国支部   商議員  

    2021.2 - 2024.3   

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    Committee type:Academic society

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  • 文部科学省 科学技術・学術政策研究所 科学技術予測センター   専門調査員  

    2021.1   

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    Committee type:Government

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  • 公益社団法人 精密工学会   精密工学会会誌編集委員  

    2021.1 - 2024.12   

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    Committee type:Academic society

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  • 公益社団法人 砥粒加工学会関西地区部会   運営委員  

    2020.4   

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  • 公益社団法人 精密工学会中国四国支部   難削材加工専門委員会委員  

    2019.1   

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  • International Committee for Abrasive Technology   Associate Member  

    2017   

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  • 公益社団法人 砥粒加工学会   次世代ものづくり研究会運営委員  

    2015.4   

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  • 公益社団法人 砥粒加工学会   砥粒加工学会誌編集委員副幹事  

    2015.4 - 2024.3   

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  • 公益社団法人 精密工学会   アフィリエイト委員  

    2013.4 - 2024.3   

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Papers

  • Development of tool life prediction system for square end-mills based on database of servo motor current value Reviewed

    Hiroyuki KODAMA, Makoto SUZUKI, Kazuhito OHASHI

    Journal of Advanced Mechanical Design, Systems, and Manufacturing   19 ( 1 )   JAMDSM0001 - JAMDSM0001   2025

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Mechanical Engineers  

    DOI: 10.1299/jamdsm.2025jamdsm0001

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  • Development of ball end-mill wear condition judgment system aided by abnormality detection and image classification Reviewed

    Hiroyuki KODAMA, Soto KOGUE, Takahiro NISHI, Kazuhito OHASHI

    Transactions of the JSME (in Japanese)   90 ( 937 )   24 - 00127   2024

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    Authorship:Lead author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Mechanical Engineers  

    DOI: 10.1299/transjsme.24-00127

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  • Study on Grinding Surface Temperature of Workpiece in Thrust Grinding Process Reviewed

    Lingxiao GAO, Motoki KUIDA, Hiroyuki KODAMA, Kazuhito OHASHI

    Proceedings of the 5th International Conference on Machining, Materials and Mechanical Technologies(IC3MT2024)   2024

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  • Study on self-excited chatter vibrations increased by transition of natural vibration modes in cylindrical plunge grinding process Reviewed

    Hiroyuki Kodama, Yuya Takami, Kota Yoshida, Kazuhito Ohashi

    Proceedings of the JMSE International Conference on Leading Edge Manufacturing/Materials & Processing (LEM&P 2023)   2023.6

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  • Construction of Grinding Wheel Decision Support System Using Random Forests for Difficult-to-cut Material Reviewed

    H. Kodama, T. Mendori, Y. Watanabe, K. Ohashi

    Precision Engineering   84   162 - 176   2023

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.precisioneng.2023.08.004

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  • Effect of Vibration Behavior in Low-Frequency Vibration Cutting on Surface Properties of Workpiece Reviewed

    H. Kodama, S. Matsuno, N. Shibata, K. Ohashi

    Int. J. of Automation Technology   17 ( 5 )   434 - 448   2023

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  • Influence on Grinding Force Distribution with Grinding Length of Cemented Carbide with Vertical Face Grinding using with Double Layers Grinding Wheel Reviewed

    Shinpei Horiguchi, Takanori Fujiwara, Ryo Komatsubara, Takashi Onishi, Hiroyuki KODAMA, Kazuhito Ohashi, Tomohiro Maeda

    Proceedings of 25th International Symposium on Advances in Abrasive Technolog(ISAAT2023)   2023

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  • Experimental Investigation of Chatter Vibration Mechanism in Cylindrical Plunge Grinding Based on Mode Shape of Workpiece System Reviewed

    Yuki MATSUMOTO, Yuya TAKAMI, Hiroyuki KODAMA, Kazuhito OHASHI

    Proceedings of 25th International Symposium on Advances in Abrasive Technolog(ISAAT2023)   2023

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  • Knowledge exploration of microdrill catalog database based on clustering Reviewed

    野原嘉人, 廣垣俊樹, 青山栄一, 児玉紘幸

    砥粒加工学会誌   66 ( 7 )   2022

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  • Influence on Grinding Force Distribution of Grinding Fluid Supply Method on Cemented Carbide with Vertical Face Grinding Reviewed

    Shimpei Horiguchi, Takanori Fujiwara, Ryo Komatsubara, Tomohiro Maeda, Takashi Onishi, Hiroyuki Kodama, Kazuhito Ohashi

    Proceedings of 24th International Symposium on Advances in Abrasive Technolog(ISAAT2022)   2022

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  • Study on the chatter vibration focused on vibration mode of workpiece system in cylindrical plunge grinding Reviewed

    Yuya Takami, Hiroyuki Kodama, Kazuhito Ohashi

    Proceedings of the 19th International Conference on Precision Engineering(ICPE2022)   2022

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  • Effect of Grinding Wheel Tooth Thickness on Grinding Force Distributions in Face Grinding of Cemented Carbide with Constant Processing Efficiency Reviewed

    Takanori Fujiwara, Ryo Komatsubara, Shinpei HORIGUCHI, Takashi Onishi, Hiroyuki Kodama, Kazuhito Ohashi, Tomohiro Maeda

    Proceedings of the 19th International Conference on Precision Engineering(ICPE2022)   2022

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  • Interpolation Prediction for Grinding Wheel Decision Support System Using Random Forest Reviewed

    Yuta WATANABE, Hiroyuki KODAMA, Kazuhito OHASHI

    Proceedings of the 4th International Conference on Machining, Materials and Mechanical Technologies(IC3MT2022)   2022

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  • Abrasive jet machining for the microprofile control patterning of herringbone grooves Reviewed

    Hiroyuki Kodama, Shota Nakamae, Masashi Harada, Daichi Wada, Kazuhito Ohashi

    Precision Engineering   72   527 - 542   2021.11

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.precisioneng.2021.07.002

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  • Support System for Deciding Cutting Condition in Mold Steel Machining Supported by Data-Mining Methods Reviewed

    Daisuke Kita, Hiroyuki Kodama, Ryutaro Kondo, Satoru Koizumi, Ryogo Yoshimura, Masami Iwata, Akira Tokuyama, Kazuhito Ohashi

    Proceedings of 23rd International Symposium on Advances in Abrasive Technolog(ISAAT2021)   2021

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  • Influence on Grinding Force Distribution in Setting Depth of Cut Variations of Cemented Carbide with Vertical Face Grinding Reviewed

    Ryo Komatsubara, Takanori Fujiwara, Takashi Tsujino, Hiroyuki Kodama, Takashi Onish, Kazuhito Ohashi

    Proceedings of 23rd International Symposium on Advances in Abrasive Technolog(ISAAT2021)   2021

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  • Effect of Viscoelasticity of Thermoplastic Resin Bonded Wheel on Ultra-Precision Grinding of SiC Wafers Reviewed

    Haruka Sakamoto, Yoji Fukushima, Kozo Sakai, Hiroyuki Kodama, Kazuhito Ohashi

    Proceedings of 23rd International Symposium on Advances in Abrasive Technolog(ISAAT2021)   2021

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  • Effect of Vibration Behaviors on the Properties of Machined Surfaces Created by Low-frequency Vibration Cutting Reviewed

    Naoyuki Shibata, Yusuke Tanimoto, Hiroyuki Kodama, Kazuhito Ohashi

    Proceedings of 23rd International Symposium on Advances in Abrasive Technolog(ISAAT2021)   2021

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  • Thermal influence on surface layer of carbon fiber reinforced plastic (CFRP) in grinding Reviewed

    Hiroyuki Kodama, Shingo Okazaki, Yifan Jiang, Hiroyuki Yoden, Kazuhito Ohashi

    Precision Engineering   65   53 - 63   2020.5

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.precisioneng.2020.04.005

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  • Investigation of principal factor decision support system using data mining methodology for surface grinding wheel Reviewed

    Hiroyuki Kodama, Takao Mendori and Kazuhito Ohashi

    Int. J. Abrasive Technology   9 ( 4 )   303 - 318   2020.4

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  • Data mining from endmill tool catalog information based on the use of a machine learning method

    Akihito Asakura, Toshiki Hirogaki, Eiichi Aoyama, Hiroyuki Kodama

    Proceedings of the ASME Design Engineering Technical Conference   9   2020

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    In recent years, the needs associated with the development of new technologies in the manufacturing industry that utilize big data typified by the Internet-of-Things (IoT) and artificial intelligence (AI) have been increasing. Recent computer-aided manufacturing (CAM) systems have evolved so that unskilled technicians can create tool paths relatively easily with numerically controlled (NC) programs, but tool-cutting conditions used for machining cannot be automatically determined. Therefore, many unskilled technicians often set the cutting conditions based on the recommended conditions described in the tool catalog. However, given that the catalog contains large-scale data on machining technology, setting the proper conditions becomes a time-consuming and inefficient process. In this study, we aimed to construct a system to support unskilled technicians to determine the optimum machining conditions. To this end, we constructed a prediction model using a random forest machine learning method to predict the cutting conditions. It was confirmed that the prediction with the random forest method can be performed with high accuracy based on the cutting conditions recommended by the tool maker. Thus, the effectiveness of this method was verified.

    DOI: 10.1115/DETC2020-22126

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  • An Effect of a Setting Depth of Cut in a Face Grinding Process with a Single Layer Electro Plated Diamond Grinding Wheel with Periphery R Shape Reviewed

    Takanori FUJIWARA, Koudai HIRAMATSU, Takuro HASHIGUCHI, Takashi TSUJINO, Ryo KOMATSUBARA, Takashi ONISHI, Hiroyuki KODAMA, Kazuhito OHASHI

    Proceedings of the 18th International Conference on Precision Engineering(ICPE2020)   2020

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  • Concentric Mutual Lapping to Improve Sliding Surface Function of SiC Ceramics Reviewed

    Hiroyuki Kodama, Hayato Koyama, Tomoaki Ishii, Yusuke Tanimoto, Kazuhito Ohashi

    Int. J. of Automation Technology   13 ( 6 )   756 - 764   2019.11

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    DOI: 10.20965/ijat.2019.p0756

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  • Decision support system for principal factors of grinding wheel using data mining methodology Reviewed

    Hiroyuki Kodama, Itaru Uotani and Kazuhito Ohashi

    Int. J. Abrasive Technology   9 ( 2 )   89 - 98   2019.8

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  • Catalog Mining Using MIC(Maximal Information Coefficient)of Radius End Mill Tool Reviewed

    SAKUMA Taishi, HIROGAKI Toshiki, AOYAMA Eiichi, KUBO Kengo, KODAMA Hiroyuki

    Journal of the Japan Society for Precision Engineering   85 ( 3 )   260 - 266   2019.3

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society for Precision Engineering  

    <p>A novel datamining method has been needed because the IoT (Internet of things) is spread over various kinds of industrial fields. We therefore propose to apply a data mining method to tool catalog data-base to improve the manufacturing technologies with machine tools because it is considered to include a useful information derived from tool manufacturing technology as a big-data. In the present report, we look at MIC (Maximal Information Coefficient) as a novel processing method to search for a new knowledge in tool data data-base, and construct a hierarchical clustering method based on MIC as a data mining method. Comparing a predicting equation derived from the conventional catalog mining method based on a traditional statistics with one based on MIC processing method, we investigate a function of MIC in data mining for end milling conditions. As a result, it can be seen that a constructed method (MIC data mining method) makes it feasible efficiently to find out essential variables in the radius end mill database because a derived practical formula has less interactions than conventional one with keeping the same prediction accuracy.</p>

    DOI: 10.2493/jjspe.85.260

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  • Proposal of data mining process for tool catalog data introducing machine learning Reviewed

    SAKUMA Taishi, ASAKURA Akihito, YAMADA Kotaro, HIROGAKI Toshiki, AOYAMA Eiichi, KODAMA Hiroyuki

    Transactions of the JSME (in Japanese)   85 ( 877 )   19 - 00215-19-00215   2019

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    <p>We attempt to construct a novel technology development utilizing big data such as Deep Learning in the manufacturing industry. Especially, we look at the data mining method and the tool catalog as a useful big data base which is updated by tool makers because it is easy for CAD/CAM engineers and machine tool operators to obtain it in the manufacturing fields. In the present report, we proposed the visualization and consideration of cutting condition determination process based on a decision tree method which is one type of statistical analysis method for radius-endmill data base. We also developed a cutting condition prediction system with a random forest which is a type of machine learning method applying a decision tree. Moreover, we performed a case study in endmilling under deriving cutting conditions by the proposed method, which is an unknown and expanded cutting condition based on tool catalog data base. As a result, it is demonstrated that the support based on machine learning is found to be effective to select a cutting condition including an unknown cutting condition in tool catalog data base.</p>

    DOI: 10.1299/transjsme.19-00215

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  • Investigation on Concentric Mutual Lapping Characteristic for Improvement in Sliding Surface Function of SiC Ceramics Reviewed

    Yusuke TANIMOTO, Hayato KOYAMA, Hiroyuki KODAMA, Kazuhito OHASHI

    Proceedings of the 22nd International Symposium on Advances in Abrasive Technology(ISAAT2019)   2019

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  • Principal Factor Decision Support System Using Data-Mining Methodology for Surface Grinding Wheel Reviewed

    Hiroyuki KODAMA, Itaru UOTANI, Takao MENDORI, Kazuhito OHASHI

    Proceedings of the 22nd International Symposium on Advances in Abrasive Technology(ISAAT2019)   2019

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  • Influence on Grinding Force Distribution in Feed Rate Variations of Cemented Carbide with Vertical Face Grinding Reviewed

    Takashi TSUJINO, Takanori FUJIWARA, Hiroyuki KODAMA, Takashi ONISHI, Shinya TSUKAMOTO, Kazuhito OHASHI

    Proceedings of the 22nd International Symposium on Advances in Abrasive Technology(ISAAT2019)   2019

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  • Influence of Grinding Temperature on Surface Quality of CFRP Reviewed

    Shingo OKAZAKI, Yifan JIANG, Hiroyuki KODAMA, Hiroyuki YODEN, Kazuhito OHASHI

    Proceedings of the 22nd International Symposium on Advances in Abrasive Technology(ISAAT2019)   2019

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  • Study on concentric mutual lapping for improvement in sliding surface function of SiC ceramics Reviewed

    Yusuke Tanimoto, Hayato Koyama, Hiroyuki Kodama, Kazuhito Ohashi

    Proceedings of the 21st International Symposium on Advances in Abrasive Technology (ISAAT2018)   2018.10

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    © ISAAT 2018 - 21st International Symposium on Advances in Abrasive Technology. All rights reserved. In this study, the ring shaped SiC ceramics applied to sliding components are selected as specimens. In the surface of SiC ceramics, many scratches penetrating the inner edge to outer one are generated in random direction by conventional lapping. The scratches affect the surface functions in prevention of fluid exuding from the outer side to the inner side of SiC ring and have low friction force on the finished surface as a sliding material. In this study, the concentric mutual lapping is proposed to remove the scratches by conventional lapping. Then, the surface topography is evaluated quantitatively by the white light interferometer and proposed the vectorial and quantitative analysis of surface profile. As a result, the concentric mutual lapping can remove scratches quickly by the conventional lapping. And then circumferential scratches along a lapping direction were generated. In addition, we analyzed effect of surface topography on the surface function as a sliding material by sliding tests. From the investigation, it turned out that the concentric mutual lapping suppressed the difference in surface functions depending on the sliding direction.

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  • Decision support system for grinding wheel selection using data-mining Reviewed

    Hiroyuki Kodama, Kazuhito Ohashi, Itaru Uotani

    Proceedings of euspen’s 18th International Conference & Exhibition   213 - 214   2018.6

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    © 2018 CURRAN-CONFERENCE. All rights reserved. In the grinding wheel catalog data-set, the recommended grinding conditions are shown in reference to five factors (abrasive grain, grain size, grade, structure, and bonding material) of the three main elements (abrasive grain, bonding material, and pore). Since systematic arrangement is not made, grinding conditions (cutting speed, table feed, depth of cut) have to be decided on the basis of an experienced engineer's information or experience. Moreover, although the setting of the five factors of the three elements of a grinding wheel is important parameter that affects the surface quality and grinding efficiency, it is difficult to determine the optimal combination of workpiece materials and grinding conditions. In this research, a support system for effectively deciding the desired grinding wheel was built by using a decision tree technique, which is one of the data-mining techniques. This system extracts a significant tendency of grinding wheel conditions from catalog data. As a result, a visualization process was proposed in correspondence to the action of the grinding wheel elements and their factors to the material characteristics of the workpiece material.

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  • Aiding of Micro End-Milling Condition Decision Using Data-Mining from Tool Catalog Data Reviewed

    Hiroyuki Kodama, Koichi Okuda, Kazuhiro Tanaka

    Int. J. of Automation Technology   12 ( 2 )   238 - 245   2018.3

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    DOI: 10.20965/ijat.2018.p0238

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  • Influence of Grinding Atmosphere on Grinding Characteristics of CFRP Reviewed

    S. Okazaki, Y. Jiang, H.Kodama, H. Yoden, K. Ohashi

    Proceedings of the 2018 International Conference on Machining, Materials and Mechanical Technologies(IC3MT2018)   105 - 109   2018

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  • Micro Abrasive Jet Patterning of Sloped Micro Herringbone Grooves for Journal Bearings Reviewed

    Shota NAKAMAE, Masashi HARADA, Hiroyuki KODAMA and Kazuhito OHASHI

    Proc. of the 20th International Symposium on Advances in Abrasive Technology   2017.12

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  • Recovery of Grindactivity by Dry Ice Blasting on Micro-Grit Diamond wheel in dry Grinding of Carbon Reviewed

    Yuto KATAYAMA, Yuki OHTA, Hiroyuki KODAMA and Kazuhito OHASHI

    Proc. of the 20th International Symposium on Advances in Abrasive Technology   2017.12

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  • Fundamental Cutting Properties in End-milling of TiAl Alloy Reviewed

    Manabu Takegami, Koichi Okuda, Hiroyuki Kodama and Shinsuke Sato

    Proc. of the 20th International Symposium on Advances in Abrasive Technology   2017.12

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  • An Ultra-precision Cutting of Carbon Steel by Diamond Tool in CO2 Atmosphere Reviewed

    Shogo Miyamoto, Koichi Okuda, Hiroyuki Kodama and Masayuki Nunobiki

    Proc. of the 20th International Symposium on Advances in Abrasive Technology   2017.12

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  • Experimental Verification of Micro End-milling Condition Decision Methodology Using Data-Mining System Reviewed

    Hiroyuki KODAMA, Koichi OKUDA, Kazuhiro TANAKA

    Proc. of the 20th International Symposium on Advances in Abrasive Technology   2017.12

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  • Development of the Grinding Wheel Decision Support System Using Data Mining Method Reviewed

    Hiroyuki KODAMA, Koichi OKUDA, Kazuhito OHASHI

    The 9th International Conference on Leading Edge Manufacturing in 21st Century   2017.11

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  • Study of Surface Integrity in Micro-groove Cutting of Anisotropic Material Reviewed

    Hiroyuki Kodama, Koichi Okuda, Yuji Kishi

    Proc. of euspen’s 17th International Conference & Exhibition   2017.5

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  • Tool Wear and Surface Roughness in Milling of Die Steel Using Binderless CBN End Mill. Reviewed

    Kazuya Hamaguchi, Hiroyuki Kodama, Koichi Okuda

    Int. J. Autom. Technol.   11 ( 1 )   84 - 89   2017.1

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    DOI: 10.20965/ijat.2017.p0084

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  • Analysis of drilling process knowledge derived from microdrill catalog database using data-mining method Reviewed

    Shogo Tabata, Eiichi Aoyama, Toshiki Hirogaki, Hiroyuki Kodama

    Proceedings of the ASME Design Engineering Technical Conference   1   2017

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:AMER SOC MECHANICAL ENGINEERS  

    As electronic devices and products are being miniaturized, the printed wiring boards (PWBs) within them are also being miniaturized. Therefore, it is becoming increasingly difficult to decide the drilling conditions required for producing small-diameter and high-density holes. We have been focusing on drilling conditions recommended in drill catalogs and have been attempting to gather knowledge that drilling experts use to decide the drilling conditions. In this study, we classify drills using the relationship between the diameter and the flute length and hence show that the methods used for setting the cutting conditions are different in different regions of a PWB. In addition, by using a catalog of microdrills that use alloy steel as the work material, we discuss how unique drilling conditions can be set for PWBs.

    DOI: 10.1115/DETC2017-67680

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  • Abnormality diagnosis based on processing reaction force in deburring by rotary brush

    Takumi Hatano, Masayuki Nunobiki, Koichi Okuda, Hiroyuki Kodama

    ISAAT 2017 - Proceedings of the 20th International Symposium on Advances in Abrasive Technology   673 - 678   2017

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:20th International Symposium on Advances in Abrasive Technology, ISAAT 2017  

    Recently, automation and labor saving are advancing in the factory. It is necessary to develop some abnormality diagnostic system, because operators usually leave a machining device after mounting tools and workpieces on the machining device. This research developed an abnormality diagnostic method for deburring process using an articulated robot with a rotary brush device. It was able to detect some abnormalities such as erroneous mounting of the rotary brush and heavy wear of the brush which have a bad influence on processing performance. In our experiment, the rotary brush was pressed against a surface of test piece slowly, the processing reaction force after contact are measured, and the increasing ratio of the reaction force was calculated. In case of erroneous mounting of the rotary brush, larger reaction force than usual was observed. In case of heavy wear of the brush, the increasing ratio of the reaction force differed from the ratio of normal brush. It was clarified that appearance of the reaction force depends on the state of rotary brush.

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  • USING CATALOG DATA MINING IN SUPPORT OF DETERMINING MICRO END-MILLING CONDITIONS Reviewed

    Hiroyuki KODAMA, Koichi OKUDA, Takuya TSUJIMOTO

    Proc. of ASME2016 International Symposium on Flexible Automation   2016.12

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    Authorship:Lead author   Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/ISFA.2016.7790146

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  • Investigation of Lithium Niobate Finished Surface Quality from Viewpoint of Crystallographic Orientation Reviewed

    Yuji KISHI, Hiroyuki KODAMA, Koichi OKUDA

    2016 International Conference on Machining Materials and Mechanical Technologies   2016.10

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  • Effect on Processing Quality of Impurities in Coolant Used in Grinding Stainless Steel Reviewed

    Hiroyuki KODAMA, Koichi OKUDA, Yuuki TAKENAKA and Taizou KAKO

    2016 International Conference on Machining Materials and Mechanical Technologies,   2016.10

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  • Experimental Research on Small-Diameter Deep-hole Drilling of Austenite Stainless Steel Reviewed

    Hiroyuki Kodama, Koichi Okuda, Toshiya Yamaguchi

    Materials Science Forum   874   481 - 486   2016.10

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    DOI: 10.4028/www.scientific.net/MSF.874.481

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  • Characteristic of tool wear in small end milling of nickel-titanium alloy Reviewed

    Kazuya Hamaguchi, Hiroyuki Kodama, Koichi Okuda

    Materials Science Forum   874   429 - 432   2016.10

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    This paper deals with the characteristics of tool wear in small end milling of nickel-titanium alloy which is used as a medical material. Cutting experiments were carried out by varying the axial relief angle of an end mill of a diameter of 0.5 mm from 0 to 15 degrees with a step of 5 degrees, and tool wear and surface roughness was evaluated. The result revealed that tool wear of a small end mill with an axial relief angle of 0 degree was smaller by 60% than that of 15 degrees, suggesting that tool wear is reduced more with a smaller axial relief angle.

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  • Decision Methodology of Micro end-milling Condition Using Tool Catalog Data-Mining System Reviewed

    Hiroyuki Kodama, Koichi Okuda, Takuya Tsujimoto

    Proc. of euspen’s 16th International Conference & Exhibition   2016.6

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  • Chip Formation during Precision Cutting of Metallic Glass Reviewed

    Hiroyuki Kodama, Koichi Okuda, Tsukasa Inada

    Advanced Materials Research   1136   265 - 270   2015.11

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  • An Experimental Study on Slotting of Inconel 718 Thin Sheet Reviewed

    Hiroyuki KODAMA, Koichi OKUDA, Tomoya HAYASE

    Journal of Mechanics Engineering and Automation   5 ( 11 )   601 - 608   2015.11

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  • Machining Accuracy and Cutting Temperature Property in Deep Hole Drilling of Stainless Steel Reviewed

    Toshiya Yamaguchi, Koichi Okuda, Hiroyuki Kodama, Taizo Yamamoto, Tsubasa Takeda

    Advanced Materials Research   1136   162 - 167   2015.11

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  • Investigation of micro-drilling conditions of printed wiring board based on data-mining of catalog information

    Yoshimasa Suzuki, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa, Hiroyuki Kodama

    Proceedings of the 8th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2015   2015.10

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    As electronic devices and products are being miniaturized, Printed Wiring Boards (PWBs) within them are also being miniaturized. Therefore, drilling conditions for small and high density holes have become more difficult to decide. We focused on drilling conditions recommended in drill catalogs and attempted to find out the knowledge that experts of drilling use to decide drilling conditions. In this paper, we focused on web thickness, one of the drill parameters, and qualitative variables written in the catalogs. The results clarified the importance of web thickness in drilling conditions and meaning of qualitative variables.

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  • Monitoring of End-Mill Process Based on Infrared Imagery with a High Speed Thermography Reviewed

    Masatoshi Shindou, Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama

    Key Engineering Materials   625   213 - 218   2015.7

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  • A Study on Tool Damage of Threading Tap in Screw Cutting of Stainless Steel 15-5PH Reviewed

    Jinno Hayashi, Koichi Okuda, Hiroyuki Kodama

    Key Engineering Materials   656-657   164 - 167   2015.7

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  • Experimental Verification of Lithium Niobate Cutting Phenomena from the View Point of Crystallographic Orientation Reviewed

    Hiroyuki Kodama, Koichi Okuda, Masaaki Harada, Tsunemasa Saiki, Kazuya Hamaguchi

    Proc. of euspen’s 15th International Conference & Exhibition   323 - 324   2015.6

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  • Influence of tool shape and coating type on machined surface quality in face milling of CFRP Reviewed

    Tatsuya Furuki, Toshiki Hirogaki, Eiichi Aoyama, Hiroyuki Kodama, Keiji Ogawa

    Advanced Materials Research   1017   310 - 315   2014

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    Since demands for Carbon Fiber Reinforced Plastics (CFRP) are increasing, the number of the studies on machining of CFRP is also increasing. However, since there are already reports on a trimming of a surplus portion or a drilling, we focus on a face machining and a generating the step shape with several cutting tools. Problems in the machining of CFRP include an occurrence of the burr and delamination. Therefore, in this report, we investigate these problems in face milling. And, the machining behavior (Cutting temperature, Cutting force) during the machining is estimated.

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  • Investigation of chatter vibration in end-milling process by considering coupled system model Reviewed

    Kosuke Hattori, Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama

    Advanced Materials Research   939   201 - 208   2014

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    Chatter vibration in cutting processes usually leads to surface finish degradation, tool damage, cutting noise, energy loss, etc. Self-excited vibration particularly seems to be a problem that is easily increased to large vibration. The regenerative effect is considered as one of the causes of chatter vibration. Although the chatter vibration occurs in various types of processing, the end-milling is a typical process that seems to cause the chatter vibration due to a lack of rigidity of one or more parts of the machine tools, cutting tool, and work-piece. The aim of our research is to propose a simple method to control chatter vibration of the end-milling process on the basis of a coupling model integrating the related various elements. In this study, hammering tests were carried out to measure the transfer function of a machine tool and cutting tool system, which seems to cause vibration. By comparing these results, finite elemental method (FEM) analysis models were constructed. Additionally, cutting experiments were carried out to confirm the chatter vibration frequencies in end-milling with a machining center. In the hammering tests, impulse hammer and multiple acceleration pick-ups are connected to a multi-channel FFT analyzer and estimate the natural frequencies and natural vibration modes. A simplified FEM model is proposed by circular section stepped beam elements on the basis of the hammering test results, considering a coupling effect. In comparisons of the calculated results and hammering test results, the vibration modes are in good agreement. As a result, the proposed model accurately predicts the chatter vibration considering several effects among the relating elements in end-milling. Moreover, it can be seen that the chatter vibration is investigated from a viewpoint of the integrating model of the end-milling process. © (2014) Trans Tech Publications, Switzerland.

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  • Elucidation of end-mill temperature based on an infrared imagery with a thermography Reviewed

    SHINDOU Masatoshi, MATSUDA Ryou, KODAMA Hiroyuki, HIROGAKI Toshiki, AOYAMA Eiichi

    Journal of the Japan Society for Abrasive Technology   58 ( 7 )   457 - 462   2014

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    In this study, we performed end-mill processing of a difficult-to-cut material (JIS SUS310 stainless steel) and observed it with high-performance infrared thermography. We discuss the relationship between the tool temperature and difference in number of teeth and tool diameter. The tool temperature distribution can be analyzed at each rotating tool position in the end-mill process from images, considering the relationship between the duration of each frame and the rotating speed of the end-mill tool. Moreover, we examined the validity by comparing the results of unsteady temperature analysis by the finite element method (FEM) and the measurement results.

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  • Experimental verification of end-milling condition decision support system using data-mining for difficult-to-cut materials Reviewed

    Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa, Koichi Okuda

    Advanced Materials Research   1017   334 - 339   2014

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    Data-mining methods using hierarchical and non-hierarchical clustering are proposed, which could help manufacturing engineers determine guidelines for deciding end-milling conditions. We have constructed a novel system that uses clustering techniques and tool catalog data to support the determination of end-milling conditions for different types of recent difficult-to-cut materials. In the present report, we especially focus on the cutting speed to estimate the performance of this system. A comparison with the conditions recommended by famous tool makers in Japan, reveals that our proposed system can be used to determine the cutting speeds for various difficult-to-cut materials. That is, milling experiments using a square end mill under two sets of end-milling conditions (conditions derived from the end-milling condition decision support system and conditions suggested by expert engineers) for difficult-to-cut materials (austenite stainless steel; JIS SUS310) showed that the catalog mining method is effective for deriving guidelines for deciding end-milling conditions at the beginning of the manufacturing stage.

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  • Experimental verification of ball-nose end-milling conditons derived from catalog-mining system based on classified inclination angles of machining surface Reviewed

    Hiroyuki Kodama, Koichi Okuda, Yui Sugaya, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa

    ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)   2B   2014

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    We previously proposed data-mining system to derive useful information from the data and attempt to determine the ball-nose end-milling conditions in a rapid prototype manufacturing system. Practical end-milling condition decision equations are derived to determine the end-milling conditions at each cluster by using response surface method. End-millings of hardened die steel JIS SKD61 (HRC53) and DH31S were carried out to investigate the practicability of derived mining conditions under contour line milling. As a result, our catalogmining system was found to be effective in selecting the endmilling conditions as the first trial condition. Catalog mining can derive indicative cutting conditions for unskilled engineers.

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  • Investigation of drilling conditions of printed circuit board based on data mining method from tool catalog data-base Reviewed

    Hisaya Haneda, Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa

    Advanced Materials Research   939   547 - 554   2014

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    Data-mining methods using hierarchical and non-hierarchical clustering are proposed that will help engineers determine appropriate drilling conditions. We have constructed a system that uses clustering techniques and tool catalog data to support the determination of drilling conditions for printed wiring boards (PWBs). Variable cluster analysis and the K-means method were used together to identify tool shape parameters that have a linear relationship with the drilling conditions listed in the catalogs. The response surface method and significant tool shape parameters obtained by clustering were used to derive drilling condition decision equations, which were used to determine the indicative drilling conditions for PWBs. Comparison of the conditions recommended by toolmakers demonstrated that our proposed system can be used to determine the drilling condition for PWBs. We carried out the drilling experiments in accordance with the catalog conditions and mining conditions, and estimated the board temperature around a drilled hole, the drilling forces, and the roughness of the drilled hole wall. © (2014) Trans Tech Publications, Switzerland.

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  • Investigation of Ball-Nose End Milling Conditions Derived from Catalog Data. Mining Based on Classified Inclination. Angle of Machining Surface Reviewed

    Y. Sugaya, H. Kodama, T. Hirogaki, E. Aoyama, K. Ogawa

    Proc. of the 15th International Conference on Precision Engineering ICPE2014   2014

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  • Proposal of ball end-milling condition decision methodology using data-mining from tool catalog data Reviewed

    Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa

    Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering   79 ( 10 )   964 - 969   2013.10

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    Machining is often performed by a machining center using various cutting tools and end-milling conditions for different shapes and materials. Recent improvements in CAM system make it easier for even unskilled engineers to generate NC programs. In the NC program, the end-milling conditions are decided by engineers. However, engineers need to decide the order of the process, cutting tool selection, and the end-milling conditions on the basis of their expertise and background knowledge because the CAM system cannot automatically decide them. Data-mining methods were attracted attention to support decisions about end-milling conditions. Our aim was to extract new knowledge by applying data-mining techniques to a tool catalog. We used both hierarchical and non-hierarchical clustering methods and also principal component regression. We focused on the shape element of catalog data and we visually clustered ball end-mills from the viewpoint of tool shape, which here meant the ratio of dimensions, by using the k - means method. Expressions for calculating end-milling conditions were derived from response surface method. We conducted end-milling experiments to validate the availability of calculated values.

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  • Elucidation of phenomena in micro-drilling for printed wiring boards containing high-hardness fillers : Investigation of drill wear and temperature during drilling Reviewed

    FUNABIKI Taiji, KODAMA Hiroyuki, AOYAMA Eiichi, HIROGAKI Toshiki, OGAWA Keiji

    JSAT   57 ( 1 )   27 - 32   2013.1

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    This paper describes micro-drilling processes of printed wiring boards (PWBs) containing high-hardness and high-thermal conduction fillers. When processing these PWBs, drill tools show severe wear because the filler has high hardness. Therefore, we examined the characteristics of drill wear and showed the usefulness of diamond-coated drills. The diamond-coated drill is effective against PWBs with higher filler filling rate. Moreover, we investigated the cutting force and PWB temperature during drilling. Macroscopically, cutting force was seen to be more significantly influenced by drill wear compared to material physical properties. On the other hand, microscopically the PWB temperature during drilling was significantly influenced by material physical properties.

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  • An indicative end-milling condition decision support system using data-mining for difficult-to-cut materials based on comparison with irregular pitch and lead end-mill and general purpose end-mill Reviewed

    Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa

    Advanced Materials Research   797   177 - 182   2013

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    Data-mining methods using hierarchical and non-hierarchical clustering are proposed that will help engineers determine appropriate end-milling conditions. We have constructed a system that uses clustering techniques and tool catalog data to support the determination of end-milling conditions for different types of difficult-to-cut materials such as austenitic stainless steel, Ni-base superalloy, and titanium alloy. Variable cluster analysis and the K-means method were used together to identify tool shape parameters that have a linear relationship with the end-milling conditions listed in the catalogs. The response surface method and significant tool shape parameters obtained by clustering were used to derive end-milling condition decision equations, which were used to determine the indicative end-milling conditions for each material. Comparison with the conditions recommended by toolmakers demonstrated that our proposed system can be used to determine the cutting speeds for various difficult-to-cut materials. © (2013) Trans Tech Publications, Switzerland.

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  • Use of catalog mining to extract valuable new knowledge hidden in trivial parameters Reviewed

    Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa

    ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)   12   2013

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    We have developed a process that uses both hierarchical and non-hierarchical clustering methods to mine data in tool catalogs. Principal component regression is used for quantifying the correlation between the predictor and criterion variables, and multiple regression analysis is used for creating an end-milling condition determinant matrix for each cluster. We fixed the outside diameter of the tool shape parameter as a constant trivial value and examined the correlation between the other tool shape parameters and the end-milling conditions. We thereby extracted valuable new knowledge hidden in trivial parameters and built a hypothesis in regards to data-mining effect. We found that cutting speed is the most important of the criterion variables and that the number of determination coefficient is no less important for determining prediction accuracy of end-milling condition decision equations. Endmilling condition decision determinants derived from our datamining process are important indicators for adjusting endmilling conditions on the basis of end-milling efficiency and tool life. Copyright © 2013 by ASME.

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  • Experimental Verification of Ball End-milling Condition Decision Support System Applying Hierarchical and Non-hierarchical Clustering Method Reviewed

    H. Kodama, T. Hirogaki, E. Aoyama, K. Ogawa

    Proc. of the 7th International Conference on Leading Edge Manufacturing in 21st Century   2013

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  • LCA Estimation of Environmental Burden Reduction Technique Considering Human Learning Curve in Decision Making of Reasonable End-milling Conditions Reviewed

    H. Kodama, T. Hirogaki, E. Aoyama, K. Ogawa, J. Sakamoto

    Proc. of the ISGMA2013 International Symposium on Green Manufacturing and Applications   2013

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  • Development of estimating method for end-mill processes by an infrared imagery : investigation between tool temperature and process efficiency

    Shindou Masatoshi, Kodama Hiroyuki, Hirogaki Toshiki, Aoyama Eiichi

    The science and engineering review of Doshisha University   53 ( 2 )   [77] - 83   2012.7

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    Nowadays, manufacturing companies have been demanded to develop new technologies to determine the machining conditions in agile and trial manufacturing fields. We therefore attempt to develop an estimating method for end-mill processes by an infrared imagery. In the present paper, we establish to monitor these processes with an infrared thermography and investigate the relationship between tool temperature and milling condition. As a result, this method is found to be effective to estimate an influence of material removal rate (MRR) on the tool temperature in the end-mill process.

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  • Investigation of end-milling condition decision methodology based on data mining for tool catalog database Reviewed

    Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa

    International Journal of Automation Technology   6 ( 1 )   61 - 74   2012.1

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    Data mining supports decision making about reasonable end-milling conditions. Our research objective is to excavate new knowledge with mining effect by applying data mining techniques to a tool catalog. We use hierarchical and nonhierarchical clustering data mining with catalog data by applying multiple regression analysis and focusing on the catalog data shape element. We visually grouped end-mills on the basis of tool shape, considering the ratio of tool shape dimensions, by employing the K-means method. We found that factors related to blade length and full length ratio are effective in for making end-milling condition decisions. These factors have not previously been singled out through background knowledge or expert knowledge, but they were noticed as a data mining effect.

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  • An end-milling condition decision support system using data-mining for difficult-to-cut materials Reviewed

    Hiroyuki Kodama, Masatoshi Shindou, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa

    Advanced Materials Research   565   472 - 477   2012

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    We proposed the data-mining methods using hierarchical and non-hierarchical clustering methods to help engineers decide appropriate end-milling conditions. The aim of our research is to construct a system that uses clustering techniques and tool catalog data to support the decision of end-milling conditions for difficult-to-cut materials. We used variable cluster analysis and the K-means method to find tool shape parameters that had a linear relationship with the end-milling conditions listed in the catalog. We used the response surface method and significant tool shape parameters obtained by clustering to derive end-milling condition. Milling experiments using a square end mill under two sets of end-milling conditions (conditions derived from the end-milling condition decision support system and conditions suggested by expert engineers) for difficult-to-cut materials (austenite stainless steel) showed that catalog mining can be used to derive guidelines for deciding end-milling conditions. © (2012) Trans Tech Publications, Switzerland.

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  • Proposal of ball end-milling condition decision methodology using data-mining from tool catalog data Reviewed

    Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa, Hiroaki Hukasawa

    Key Engineering Materials   523-524   386 - 391   2012

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    Machining is often performed by a machining center using various cutting tools and conditions for different shapes and materials. Recent improvements in CAM system make it easier for even unskilled engineers to generate NC programs. In the NC program, the end-milling conditions are decided by engineers. However, engineers need to decide the order of the process, cutting tool selection, and the end-milling conditions on the basis of their expertise and background knowledge because the CAM system cannot automatically decide. Data-mining methods were used to support decisions about end-milling conditions. Our aim was to extract new knowledge by applying data-mining techniques to a tool catalog. We used both hierarchical and non-hierarchical clustering of catalog data and also used applied multiple regression analysis. We focused on the shape element of catalog data and we visually grouped ball end-mills from the viewpoint of tool shape, which here meant the ratio of dimensions, by using the k-means method. We also found an expression for calculating end-milling conditions, and we compared the calculated with the catalog values. © (2012) Trans Tech Publications, Switzerland.

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  • Practical formula for predicting drill wear in micro-drilling of printed circuit boards containing high hardness fillers Reviewed

    Taiji Funabiki, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa, Hiroyuki Kodama

    ASME/ISCIE 2012 International Symposium on Flexible Automation, ISFA 2012   541 - 547   2012

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    This paper describes micro-drilling processes for Printed Circuit Boards (PCBs) containing fillers with high hardness and high thermal conductivity. Powered primarily by devices such as digital cameras, laptop computers, and wireless communications devices, current the electronics field today is continuously demanding smaller, lighter, and more technologically advanced high performance devices. It has been a problem from such a tendency that the increase in amount of semiconductor-generated heat has a undesirable influence on such devices. Additionally, from a viewpoint of environmental problems, electric vehicles and LEDs are developed actively. One of the principal components for building such devices is Printed Circuit Boards (PCBs). In recent years, PCBs containing alumina fillers with high thermal conductivity have been developed and begun to be widely used. However, when processing these PCBs, the drill tools severely wear because of the filler's high hardness. We therefore examined the drill wear characteristics and derived the practical drill wear formulas from the results to develop a suitable CAM system. It can be seen that these equations are similar to Taylor's tool life equation. We also investigated the thermal conductivity effect on temperature during drilling processes. The temperature around the drill hole was shown to be a complex phenomenon according to increasing filler content to PCBs. Copyright © 2012 by ASME.

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  • LCA estimation of end-milling condition derived from catalog-mining considering human learning curve Reviewed

    Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa, Junichi Sakamoto

    Proceedings of the ASME Design Engineering Technical Conference   2 ( PARTS A AND B )   1163 - 1172   2012

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    Choosing cutting tools and end-milling conditions depends on expert engineersâTM knowledge and experience, and often a lengthy process of trial and error is required before they obtain appropriate cutting conditions. We have previously proposed data-mining methods to make decisions about end-milling conditions on the basis of catalog data. We cut hardened die steel JIS SKD61 under three kinds of end-milling conditions: catalog recommended conditions, conditions derived from datamining (mined conditions), and expert engineer conditions. We used LCA to evaluate quantitatively the environmental impact resulting from these conditions. We designed an index model of the environmental burden in the technical mastering process under the three condition. The results show that unskilled engineers could decrease the cumulative environmental burden by working under the mined condition in the initial stage. Recommending the use of the mined condition in the initial stage is therefore considered best. Copyright © 2012 by ASME.

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  • Knowledge discovery from end-milling conditions decision methodology using data-mining:Proposal of data-mining method using non-trivial cutting tool parameters Reviewed

    KODAMA Hiroyuki, HIROGAKI Toshiki, AOYAMA Eiichi, OGAWA Keiji

    Journal of the Japan Society for Abrasive Technology   56 ( 3 )   173 - 178   2012

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    Data-mining methods were used to support decisions about reasonable cutting conditions. The aim of our research was to extract valuable new knowledge by applying data-mining techniques to a tool catalog. We used both hierarchical and non-hierarchical clustering of catalog data, and also applied multiple regression analysis. We fixed the outside diameter D of the tool shape parameter as a constant trivial value in this data-mining method. We examined the influence rate of other tool shape parameters to extract valuable new knowledge hidden in trivial parameters.

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  • Phenomena elucidation of micro-drilling for Printed Wiring Boards containing high hardness fillers Reviewed

    FUNABIKI Taiji, KODAMA Hiroyuki, AOYAMA Eiichi, HIROGAKI Toshiki, OGAWA Keiji

    Journal of the Japan Society for Abrasive Technology   56 ( 4 )   244 - 249   2012

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    This paper describes the micro-drilling process of printed wiring boards (PWBs) containing high hardness and high thermal conductive fillers. When processing these PWBs, the drill tools undergo severe wear due to the high hardness of the filler. Therefore, we examined the characteristics of drill wear and derived practical formulas of drill wear from these results. These equations are similar to Taylor's tool life equation. Moreover, we investigated the effects of thermal conductivity on temperature during the drilling process. The temperature around the drill hole was shown to be a complex phenomenon according to increasing filler content of PWBs.

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  • Aid of end-milling condition decision using data mining from tool catalog data for rough processing Reviewed

    KODAMA Hiroyuki, HIROGAKI Toshiki, AOYAMA Eiichi, OGAWA Keiji

    Journal of the Japan Society for Abrasive Technology   56 ( 12 )   824 - 829   2012

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    We investigated the use of data mining methods to help engineers decide on end-milling conditions. The aim of our research is to find new knowledge by applying data mining techniques to a tool catalog data. We used hierarchical and non-hierarchical clustering methods as well as principal component analysis and multiple regression analysis. We used the K-means method and focused on the shape presented in the catalog data, and grouped end-mills from the viewpoint of the tool shape, i.e., the ratios of its dimensions. We decreased the number of variables by variable cluster analysis. In addition, we found an expression for calculating cutting conditions and compared the calculated values with those in the catalog. There were three end-milling conditions: conditions recommended in the catalog, conditions derived by data mining, and proven cutting conditions for die machining (rough processing).

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  • Investigation of micro-drilling for printed circuit boards containing high-hardness fillers Reviewed

    Taiji Funabiki, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa, Hiroyuki Kodama

    Advanced Materials Research   565   442 - 447   2012

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    This paper describes micro-drilling processes for printed circuit boards (PCBs) containing fillers with high hardness and high thermal conductivity. Inspired primarily by devices such as digital cameras, laptop computers, and wireless communications devices, the electronics field today is continuously demanding smaller, lighter, and more technologically advanced high performance devices. However, that the increase in semiconductor-generated heat tends to affect such devices negatively. Additionally, from the viewpoint of environmental problems, electric vehicles and LEDs are being developed actively. PCBs are one of the principal components for building such devices. In recent years, PCBs containing alumina fillers with high thermal conductivity have been developed and begun to be widely used. However, when processing these PCBs, the drill tools become severely worn because of the filler's high hardness. We therefore examined the drill wear characteristics. The results show the filler is the main factor that causes drill wear, while the increase in cutting force does not affect it. The cutting force increases with the drill wear linearly. Moreover, the characteristic of PCBs with higher filler content rates is close to that of inorganic material like ceramics. © (2012) Trans Tech Publications, Switzerland.

    DOI: 10.4028/www.scientific.net/AMR.565.442

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  • Utility Evaluation Regarding Technical Mastering Process on End-milling Condition Decision Support System Using Data Mining Reviewed

    J. Sakamoto, T. Hirogaki, E. Aoyama, K. Ogawa, H. Kodama

    Proc. of the 15th International Conference on Advances in Materials & Processing Technology   2012

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  • Decision methodology of end-milling conditions using data-mining Reviewed

    Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa, Hiroyuki Kodama, Tasuku Kitamura

    Precision Engineering   35 ( 2 )   197 - 203   2011.4

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    The purpose of the present study is to apply data-mining methods to support the decision of reasonable cutting conditions. Although an enormous amount of information is listed in a catalog, it is not possible to know all of it. Seen from the viewpoint of the user, this enormous amount of information becomes a hindrance. For example, even if an expert worker does not look at a catalog, in end-mill processing, he can decide the appropriate processing condition efficiently from experience; however, this type of situation creates difficult problems for an unskilled worker or a skilled worker with little experience. The recommended cutting condition for every type of material is listed in a catalog together with the appropriate tool, but it takes much time and labor to search and examine the catalog to find the right tool, and this process is inefficient. The main subject of our research was to support the processing condition of the end-mill for each precision tool efficiently based on end-mill clusters. Our research applied the techniques of data mining, in particular, non-hierarchy clustering and hierarchy clustering, to catalog data. With these techniques, we applied multiple regression analysis and reached the following main conclusions. As a first step, we paid attention to the shape element of catalog data. In addition to using conventional mining processes, we grouped end-mills from the viewpoint of tool shape, which meant the ratio of dimensions, visually by applying the K-means method. We applied variable cluster analysis next to each cluster and extracted an predictor variable to represent each cluster, and we performed multiple regression analysis and derived a cutting condition decision formula. The cutting condition decision formula provided high accuracy. The accuracy was higher than the results achieved through mining of all data. A more highly precise processing condition decision formula was derived by doing mining again, excluding the peculiar data clusters such as small diameter end-mill. We understood what was effective for cutting condition decision to be factors related to blade length and the ratio of the full length, factors which have not been singled out through background knowledge or expert knowledge, but were noticed as an effect of catalog mining. © 2010 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.precisioneng.2010.11.005

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  • Effects on proposed end-milling condition decision-support system using data mining on saving power consumption

    Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa, Junichi Sakamoto

    Proceedings of the 6th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2011   2011

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    Choosing cutting tools and conditions depends on expert engineers' knowledge and experience, and often a lengthy process of trial and error is required before they obtain appropriate end-milling conditions. We have previously proposed data mining methods to make decisions about end-milling conditions on the basis of catalog data. We cut hardened die steel JIS SKD61 under three kinds of end-milling conditions: catalog conditions, mined conditions, expert engineer conditions. We used LCA to quantitatively evaluate the environmental impact resulting from these conditions. Results showed that the mined condition is environmentally superior to the catalog conditions.

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  • Aid of end-milling condition decision using data mining from tool catalog data for rough processing Reviewed

    Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa

    Advanced Materials Research   325   345 - 350   2011

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    The uses of data mining methods to support workers decide on reasonable cutting conditions has been investigated in this work. The aim of our research is to find new knowledge by applying data mining techniques to a tool catalog. Hierarchical and non-hierarchical clustering of catalog data as well as multiple regression analysis was used. The K-means method was used and on the shape presented in the catalog data and grouped end mills from the viewpoint of the tool's shape, which here means the ratio of dimensions has been focused. The numbers of variables were decreased using hierarchical cluster analysis. In addition, an expression for calculating the better cutting conditions was found and the calculated values were compared with the catalog values. There were three cutting conditions: conditions recommended in the catalog, conditions derived by data mining, and proven cutting conditions for die machining (rough processing). © (2011) Trans Tech Publications, Switzerland.

    DOI: 10.4028/www.scientific.net/AMR.325.345

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  • 907 Development of Photocatalysis Filter using Ti metal fiber aided TiO_2 and Hydroxyapatite

    Kodama Hiroyuki, Hirogaki Toshiki, Aoyama Eiichi, Ogawa Keiji

    Proceedings of JSPE Semestrial Meeting   2011   255 - 256   2011

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    DOI: 10.11522/pscjspe.2011S.0.255.0

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  • Improvement accuracy of cutting condition decision formula using catalog mining

    Hiroaki Fukasawa, Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa

    Proceedings of the 6th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2011   2011

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    The aim of our research was to extract new knowledge by applying data mining techniques to machine tool maker catalogs. We cut a SKD61 under three types of cutting conditions: those recommended in tool maker catalogs, those derived from data mining, and those recommended by veteran engineers. Conditions derived from data mining were found to be more stable than those recommended in tool maker catalogs. We fed back based on the catalog mining process. We found improvement accuracy of cutting conditions by calculating the corrective coefficient. As a result, these cutting conditions decision formulas were found to be highly accurate.

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  • Cutting Condition Decision Support System Using Data Mining -Application of Life Cycle Assessment on Estimation of Cutting Conditions- Reviewed

    J. Sakamoto, H. Kodama, T. Hirogaki, E. Aoyama, K. Ogawa

    Proc. of the 7th International Symposium on Environmentally Conscious Design and Inverse Manufacturing   640 - 644   2011

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  • Cutting condition decision methodology based on data-mining of tool catalog data Reviewed

    Hiroyuki Kodama, Toshiki Hirogaki, Eiichi Aoyama, Keiji Ogawa

    ASME 2010 International Manufacturing Science and Engineering Conference, MSEC 2010   2   491 - 499   2010

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    Data-mining methods were used to support decisions about reasonable cutting conditions. The aim of our research was to extract new knowledge by applying data-mining techniques to a tool catalog. We used both hierarchical and non-hierarchical clustering of catalog data and also used applied multiple regression analysis. We focused on the shape element of catalog data and we visually grouped end mills from the viewpoint of tool shape, which here meant the ratio of dimensions, by using the k-means method. We then decreased the number of variables by using hierarchical cluster analysis. We also found an expression for calculating the best cutting conditions, and we compared the calculated values with the catalog values. We did 15 minutes of cutting work using three kinds of cutting conditions: conditions recommended in the catalog, conditions derived by data-mining, and proven cutting conditions for die machining (rough processing). © 2010 by ASME.

    DOI: 10.1115/MSEC2010-34199

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  • Decision Methodology of Cutting Condition Based on Data-mining of Tool Catalog Data Reviewed

    H. Kodama, T. Hirogaki, E. Aoyama, K. Ogawa

    Proc. of ASME2010 International Manufacturing Science and Engineering Conference   1 - 9   2010

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  • Effect on Decision Methodology of End-milling Conditions Using Data-mining Reviewed

    H. Kodama, T. Hirogaki, E. Aoyama, K. Ogawa, T. Kitamura

    Proc. of ISFA 2010 International Symposium on Flexible Automation   1 - 8   2010

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MISC

  • 砥粒加工学会に貢献したいことや望むこと

    児玉 紘幸

    砥粒加工学会誌   69 ( 1 )   20 - 21   2025.1

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  • 高精度化・効率化の進む研削加工技術とその動向

    大橋一仁, 児玉紘幸

    機械技術   72 ( 13 )   16 - 19   2024.11

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  • Grinding Wheel Element Determination Support System by Random Forest Method

    児玉紘幸

    精密工学会誌(Web)   88 ( 7 )   2022

  • データマイニングによる研削加工支援システムの開発

    児玉紘幸

    機械の研究   73 ( 9 )   2021

  • データマイニングに支援されたモノづくりシステムに関する研究

    児玉紘幸

    砥粒加工学会誌   64 ( 1 )   2020

  • Cutting condition decision support system by using data-mining method

    児玉紘幸

    砥粒加工学会誌   64 ( 5 )   2020

  • データマイニング手法を応用した切削条件決定支援システム

    児玉紘幸

    システム/制御/情報   61 ( 9 )   2017

  • Decision Aiding of Manufacturing Using Data-Mining

    児玉紘幸

    精密工学会誌(Web)   83 ( 11 )   2017

  • 解説 博士論文 工具カタログからのデータマイニングに支援されたものづくりシステムに関する研究

    児玉 紘幸

    精密工学会誌   83 ( 2 )   2017

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  • 魔鏡が映す匠の技術(製作工程・インタビュー編)

    銀屋真, 児玉紘幸, 杉原達哉, 関根大輔, 中野晃太, 西土和臣, 連沼諒典, 廣岡伸哉

    精密工学会誌   78 ( 6 )   469 - 474   2012

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  • Craftsmanship in Magic Mirror-Part I : History and Mechanism

    Journal of the Japan Society for Precision Engineering   78 ( 1 )   49 - 52   2012

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    Publisher:Japan Society for Precision Engineering  

    DOI: 10.2493/jjspe.78.49

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Presentations

  • Investigation on Concentric Mutual Lapping characteristic for Improvement in Sliding Surface Function of SiC Ceramics International conference

    Yusuke TANIMOTO, Hayato KOYAMA, Hiroyuki KODAMA and Kazuhito OHASHI

    The 22nd International Symposium on Advances in Abrasive Technology 

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    Event date: 2019.12.6 - 2019.12.9

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  • Investigation of Principal Factor Decision Support System Using Data-Mining Methodology for Surface Grinding Wheel International conference

    Hiroyuki KODAMA, Itaru UOTANI, Takao MENDORI and Kazuhito OHASHI

    The 22nd International Symposium on Advances in Abrasive Technology 

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    Event date: 2019.12.6 - 2019.12.9

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  • Construction of cutting evaluation system for mold manufacturing based on servo motor current value applying data mining method International conference

    Hiroyuki KODAMA, Hikaru OHIRA and Kazuhito OHASHI

    IMECE 2019 International Mechanical Engineering Congress & Exposition  ASME

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    Event date: 2019.11.11 - 2019.11.14

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Calvin L. Rampton Salt Palace Convention Center, Salt Lake City, Utah  

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  • Decision Support System for Principal Factors of Grinding Wheel Using Data-Mining Methodology International conference

    Hiroyuki KODAMA, Itaru UOTANI and Kazuhito OHASHI

    The 21th International Symposium of Advances in Abrasive Technology ISAAT2017 

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    Event date: 2018.10.14 - 2018.10.17

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  • Decision Support System for Grinding Wheel Selection Using Data-Mining International conference

    Hiroyuki Kodama, Kazuhito Ohashi, Itaru Uotani

    euspen’s 18th International Conference & Exhibition 

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    Event date: 2018.6.4 - 2018.6.8

    Language:English   Presentation type:Poster presentation  

    Venue:Venice, Italy  

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  • An Ultra-precision Cutting of Carbon Steel by Diamond Tool in CO2 Atmosphere International conference

    Shogo Miyamoto, Koichi OKuda, Hiroyuki Kodama and Masayuki Nunobiki

    The 20th International Symposium of Advances in Abrasive Technology ISAAT2017 

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    Event date: 2017.12.3 - 2017.12.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Okinawa, Japan  

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  • Recovery of Grindactivity by Dry Ice Blasting on Micro-Grit Diamond wheel in dry Grinding of Carbon International conference

    Yuto KATAYAMA, Yuki OHTA, Hiroyuki KODAMA and Kazuhito OHASHI

    The 20th International Symposium of Advances in Abrasive Technology ISAAT2017 

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    Event date: 2017.12.3 - 2017.12.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Okinawa, Japan  

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  • Fundamental Cutting Properties in End-milling of TiAl Alloy International conference

    Manabu Takegami, Koichi Okuda, Hiroyuki Kodama and Shinsuke Sato

    The 20th International Symposium of Advances in Abrasive Technology ISAAT2017 

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    Event date: 2017.12.3 - 2017.12.6

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  • Experimental Verification of Micro End-milling Condition Decision Methodology Using Data-Mining System International conference

    Hiroyuki KODAMA, Koichi OKUDA and Kazuhiro TANAKA

    The 20th International Symposium of Advances in Abrasive Technology ISAAT2017 

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    Event date: 2017.12.3 - 2017.12.6

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Okinawa, Japan  

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  • Micro Abrasive Jet Patterning of Sloped Micro Herringbone Grooves for Journal Bearings International conference

    Shota NAKAMAE, Masashi HARADA, Hiroyuki KODAMA and Kazuhito OHASHI

    The 20th International Symposium of Advances in Abrasive Technology ISAAT2017 

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    Event date: 2017.12.3 - 2017.12.6

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  • Development of the Grinding Wheel Decision Support System Using Data Mining Method International conference

    Hiroyuki KODAMA, Koichi OKUDA, Kazuhito OHASHI

    The 9th International Conference on Leading Edge Manufacturing in 21st Century 

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    Event date: 2017.11.13 - 2017.11.17

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Hiroshima, Japan  

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  • Study of Surface Integrity in Micro-groove Cutting of Anisotropic Material International conference

    Hiroyuki Kodama, Koichi Okuda, Yuji Kishi

    euspen’s 17th International Conference & Exhibition 

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    Event date: 2017.5.29 - 2017.6.2

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    Venue:Hannover, Germany  

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  • Study on Machining Conditions Based on Data Mining from Radius End mill Tool Catalog Data International conference

    Kengo KUBO, Toshiki HIROGAKI, Eiichi AOYAMA and Hiroyuki KODAMA

    The 16th International Conference on Precision Engineering 

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    Event date: 2016.11.14 - 2016.11.16

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  • Effect on Processing Quality of Impurities in Coolant Used in Grinding Stainless Steel International conference

    H. Kodama, K. Okuda, Y. Takenaka and T. Kako

    2016 International Conference on Machining Materials and Mechanical Technologies 

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    Event date: 2016.10.7 - 2016.10.11

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Matsue, Japan  

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  • Experimental Research on Small-diameter Deep-hole Drilling of Austenite Stainless Steel International conference

    H. Kodama, K. Okuda and T. Yamaguchi

    The 19th International Symposium of Advances in Abrasive Technology ISAAT2016 

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    Event date: 2016.10.2 - 2016.10.5

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    Venue:Stockholm, Sweden  

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  • Characteristic of tool wear in small end milling of Nickel-titanium alloy International conference

    Kazuya Hamaguchi, Hiroyuki Kodama and Koichi Okuda

    The 19th International Symposium of Advances in Abrasive Technology ISAAT2016 

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    Event date: 2016.10.2 - 2016.10.5

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    Venue:Stockholm, Sweden  

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  • Using Catalog Data Mining in Support of Determining Micro End-milling Conditions International conference

    H. Kodama, K. Okuda and T. Tsujimoto

    ASME2016 International Symposium on Flexible Automation 

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    Event date: 2016.8.1 - 2016.8.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:Cleveland, USA  

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  • Decision Methodology of Micro end-milling Condition Using Tool Catalog Data-Mining System International conference

    H. Kodama, K. Okuda and T. Tsujimoto

    euspen’s 16th International Conference & Exhibition 

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    Event date: 2016.5.30 - 2016.6.3

    Language:English   Presentation type:Poster presentation  

    Venue:Nottingham, UK  

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  • オーステナイト系ステンレス鋼の壁面部における正面フライス切削特性

    児玉紘幸,奥田孝一,橋野慶介

    精密工学会春季大会 

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    Event date: 2016.3.15 - 2016.3.17

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東京理科大学  

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  • スローアウェイエンドミルによるチタン合金の溝切削に関する研究

    竹上学,児玉紘幸,奥田孝一

    公益社団法人砥粒加工学会卒業研究発表会 

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    Event date: 2016.3.4

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  • An Experimental Study on Slotting of Inconel 718 Thin Sheet International conference

    H. Kodama, K. Okuda and T. Hayase

    The 8th International Conference on Leading Edge Manufacturing in 21st Century 

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    Event date: 2015.10.18 - 2015.10.22

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    Venue:Kyoto, Japan  

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  • Chip Formation during Precision Cutting of Metallic Glass International conference

    H. Kodama, K. Okuda and T. Inada

    The 18th International Symposium of Advances in Abrasive Technology ISAAT2015 

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    Event date: 2015.10.4 - 2015.10.7

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    Venue:Jeju, Korea  

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  • 金属ガラスの精密切削における切りくず生成挙動に関する実験的研究

    児玉紘幸,奥田孝一,稲田司

    2015年度砥粒加工学会学術講演会 

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    Event date: 2015.9.9 - 2015.9.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:慶應義塾大学  

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  • 工具カタログデータマイニング手法を適用した難削材加工用の切削条件決定支援システム

    児玉紘幸,奥田孝一,布引雅之

    精密工学会秋季大会 

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    Event date: 2015.9.4 - 2015.9.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東北大学  

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  • カタログマイニングに基づくボールエンドミル傾斜面加工条件の考察

    久保健吾,廣垣俊樹,青山栄一,児玉紘幸,小川圭二

    精密工学会関西支部関西地方学術講演会 

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    Event date: 2015.6.23

    Language:Japanese   Presentation type:Poster presentation  

    Venue:京都工芸繊維大学  

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  • Experimental Verification of Lithium Niobate Cutting Phenomena from the View Point of Crystallographic Orientation International conference

    H. Kodama, K. Okuda, M. Harada, T. Saiki and K. Hamaguchi

    euspen’s 15th International Conference & Exhibition  euspen’s 15th International Conference & Exhibition

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    Event date: 2015.6.1 - 2015.6.5

    Language:English   Presentation type:Poster presentation  

    Venue:Leuven, Belgium  

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  • 微粒子ショットピーニングが小径エンドミルの工具摩耗に及ぼす影響

    浜口和也,児玉紘幸,奥田孝一

    精密工学会春季大会 

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    Event date: 2015.3.17 - 2015.3.19

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:東洋大学  

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  • 非階層・階層型クラスタリング手法を適用したソリッドドリル切削条件の決定法

    児玉紘幸,奥田孝一,布引雅之

    精密工学会春季大会  東洋大学

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    Event date: 2015.3.17 - 2015.3.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • ステンレス鋼の研削加工におけるクーラント中の不純物が加工面性状に及ぼす影響

    竹中佑樹,奥田孝一,児玉紘幸

    日本機械学会関西支部 第90期定時総会・講演会・見学会 関西学生会学生員卒業研究発表講演会 

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    Event date: 2015.3.13 - 2015.3.17

    Presentation type:Poster presentation  

    Venue:京都大学桂キャンパス  

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  • インコネル718薄板のエンドミル溝加工に関する研究

    早瀬友哉,奥田孝一,児玉紘幸

    日本機械学会関西支部 第90期定時総会・講演会・見学会 関西学生会学生員卒業研究発表講演会 

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    Event date: 2015.3.13 - 2015.3.17

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • An End-milling Condition Decision Support System Using Hierarchical and Non-hierarchical Clustering Method for Difficult-to-cut Materials Invited International conference

    Hiroyuki Kodama, Koichi Okuda and Masayuki Nunobiki

    International Symposium on Ultraprecision Engineering and Nanotechnology (ISUPEN) 

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    Event date: 2015.3.13

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  • 熱可塑性樹脂ボンド砥石の樹脂配合比によるSiCウェハ の研削特性への影響

    大地康矢, 坂本悠, 坂井孝三, 児玉紘幸, 大橋一仁

    2024年度精密工学会九州支部・中国四国支部 鹿児島地方講演会  2024.12.7 

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  • ロータリドレッサの周速比によるドレッシング特性への 影響

    辻 佳裕, 原田 真, 小原達也, 児玉紘幸, 大橋一仁

    2024年度精密工学会九州支部・中国四国支部 鹿児島地方講演会  2024.12.7 

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  • 勾配ブースティング手法を援用したボールエンドミル工具摩耗状態判定システムの開発

    児玉紘幸, 鈴木 誠, 大橋一仁

    第20回国際工作機械技術者会議(IMEC2024)  2024.11.8 

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  • 超仕上過程におけるAE波の実験的検討

    大橋一仁, 張 毅, 玉置巧実, 児玉紘幸

    日本機械学会第15回 生産加工・工作機械部門講演会  2024.10.5 

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  • Study on Grinding Surface Temperature of Workpiece in Thrust Grinding Process

    Lingxiao GAO, Motoki KUIDA, Hiroyuki KODAMA, Kazuhito OHASHI

    The 5th International Conference on Machining, Materials and Mechanical Technologies  2024.9.12 

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  • 円筒プランジ研削における砥⽯作業⾯トポグラフィによる仕上⾯プロフィル発現機構(第1報) −砥⽯作業⾯トポグラフィと仕上⾯プロフィルとの関係−

    戎谷俊慶, 児玉紘幸, 大橋一仁

    2024年度精密工学会秋季大会学術講演会  2024.9.6 

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  • 熱可塑性樹脂ボンド砥⽯の組織制御に関する研究(第1報) −ボンド粒⼦径と気孔率との関係−

    村尾大地, 坂井考三, 児玉紘幸, 大橋一仁

    2024年度精密工学会秋季大会学術講演会  2024.9.6 

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  • 勾配ブースティング手法を援用したボールエンドミル工具寿命判定システムの開発

    鈴木 誠, 児玉紘幸, 大橋一仁

    2024年度精密工学会秋季大会学術講演会  2024.9.5 

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  • 立形ロータリドレッサによる超砥粒砥石のドレッシングに関する研究(第1報) −砥石表面への砥粒干渉機構の理論的解析−

    中内亮太, 太田惠三, 東江眞一, 児玉紘幸, 大橋一仁

    2024年度砥粒加工学会学術講演会(ABTEC2024)  2024.8.26 

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  • スラスト研削における仕上⾯への熱影響に関する研究(第1報)─ 研削温度の変化過程 ─

    高凌霄, 柆田元希, 児玉紘幸, 大橋一仁

    2024年度精密工学会春季大会学術講演会  2024.3.12 

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  • 超仕上加工におけるAE波とその挙動に関する研究

    玉置巧実, 張 毅, 児玉紘幸, 大橋一仁

    砥粒加工学会 先進テクノフェア (ATF2024) 卒業研究発表会  2024.3.8 

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  • 切削油温によるCNC旋盤のタレットにおける熱変形の検討

    中原 麦, 江口真生, 白神大資, 本田康太, 三宅成人, 児玉紘幸, 大橋一仁

    2023年度精密工学会中国四国支部・九州支部共催広島地方講演会  2023.12.9 

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  • 熟練技能者のボールエンドミル摩耗判定基準の実験的解明

    藤原一登, 小林 咲, 児玉紘幸, 大橋一仁

    2023年度精密工学会中国四国支部・九州支部共催広島地方講演会  2023.12.9 

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  • SiC リングの超仕上げ加工における加工因子が被削材平坦度に及ぼす影響の検討

    松野翔太, 児玉紘幸, 大橋一仁

    2023年度精密工学会中国四国支部・九州支部共催広島地方講演会  2023.12.9 

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  • データマイニングを援用した穴あけ加工における加工面粗さの予測に関する研究

    下津遥河, 児玉紘幸, 高見昭康, 山本泰三, 大橋一仁

    2023年度精密工学会中国四国支部・九州支部共催広島地方講演会  2023.12.9 

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  • 熱可塑性樹脂ボンド砥石によるアルミナ系セラミックス基板の研磨加工に関する研究−第1 報:試作砥石の研磨性能−

    二宮知己, 林 潤一, 井手大介, 福岡昭弘, 児玉紘幸, 大橋一仁

    2023年度精密工学会秋季大会学術講演会  2023.9.14 

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  • CFRPのドライアイスジェット援用乾式研削における切りくず除去へのドライアイス昇華特性の影響

    段王春輝, 山﨑一志, 余田裕之, 児玉紘幸, 大橋一仁

    2023年度砥粒加工学会学術講演会(ABTEC2023)  2023.8.30 

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  • アンサンブル学習手法を応用した難削材加工における研削性能予測システムの構築

    木村俊介, 渡邊勇太, 児玉紘幸, 大橋一仁

    2023年度砥粒加工学会学術講演会(ABTEC2023)  2023.8.30 

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  • カップ型複層砥石を用いた超硬の正面研削における 研削抵抗分布と仕上げ面粗さへの影響

    堀口晋平, 藤原貴典, 小松原凌, 大西孝, 児玉紘幸, 大橋一仁, 前田知洋

    2023年度砥粒加工学会学術講演会(ABTEC2023)  2023.8.29 

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  • アブレイシブジェットを用いた総形ビトリファイドcBN砥石のドレッシングに関する研究

    中内亮太, 是澤律秀, 児玉紘幸, 大橋一仁

    2023年度砥粒加工学会学術講演会(ABTEC2023)  2023.8.28 

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  • GAN とCNN 手法を応用したボールエンドミル切れ刃の摩耗判定システムの開発

    西 隆宏, 児玉紘幸, 大橋一仁

    2023年度精密工学会春季大会学術講演会  2023.3.14 

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  • 非階層型クラスタリング手法およびアンサンブル学習を併用したボールエンドミル切削条件決定支援手法

    盛元達雄, 児玉紘幸, 大橋一仁

    2023年度精密工学会春季大会学術講演会  2023.3.14 

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  • 円筒研削におけるびびり振動変位に基づく振動モードの実験的検討

    松本悠希, 高見祐矢, 児玉紘幸, 大橋一仁

    砥粒加工学会 先進テクノフェア (ATF2023) 卒業研究発表会  2023.3.9 

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  • ウェットブラストによる総形cBN砥石のドレッシングに関する研究

    是澤律秀, 児玉紘幸, 大橋一仁

    2022年度精密工学会九州支部・中国四国支部 久留米地方講演会  2022.12.3 

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  • 超硬の正面研削における研削液供給法が及ぼす研削抵抗および研削抵抗分布への影響

    藤原貴典, 小松原 凌, 堀口晋平, 大橋一仁, 児玉紘幸, 大西 孝, 前田知洋

    日本機械学会2022 年度年次大会  2022.9.12 

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  • サーボモータ電流にデータマイニング手法を適用したエンドミル摩耗予測手法の開発

    瀬戸川将章, 児玉紘幸, 大橋一仁

    2022年度精密工学会秋季大会学術講演会  2022 

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  • 畳み込みオートエンコーダの異常検知機能を用いたエンドミル摩耗判定システムの開発

    西 隆宏, 児玉紘幸, 大橋一仁

    2022年度砥粒加工学会学術講演会(ABTEC2022)  2022 

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  • データマイニングを活用したボールエンドミル切削条件最適化手法の開発

    児玉紘幸, 盛元達雄, 喜多大輔, 大橋一仁

    第19回国際工作機械技術者会議(IMEC2022)  2022 

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  • ランダムフォレスト手法に援用された切削条件導出の有用性に関する基礎的研究

    盛元達雄, 喜多大輔, 児玉紘幸, 大橋一仁

    2022年度砥粒加工学会学術講演会(ABTEC2022)  2022 

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  • ランダムフォレスト手法により構築された研削砥石要素決定支援システムの実験的検証

    渡邊勇太, 妻鳥尭生, 児玉紘幸, 大橋一仁

    砥粒加工学会 先進テクノフェア (ATF2021) 卒業研究発表会  2021 

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  • 円筒プランジ研削におけるびびり振動現象に関する研究 〜⼯作物系の振動モードの遷移〜

    吉田高太, 大橋一仁, 児玉紘幸

    2021年度精密工学会春季大会学術講演会  2021 

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  • SiCセラミックスの超音波小径穴あけ加工に関する基礎的研究

    三宅克生, 児玉紘幸, 大橋一仁

    日本機械学会中国四国支部総会・講演会講演論文集  2020 

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  • SiCウェハの精密研削における熱可塑性樹脂砥石の砥粒挙動に基づく研削特性の検討

    福嶋洋志, 小川和範, 坂井孝三, 児玉紘幸, 大橋一仁

    砥粒加工学会学術講演会講演論文集  2020 

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  • ランダムフォレスト手法を用いた砥石決定支援システムの内挿予測精度評価

    妻鳥尭生, 児玉紘幸, 大橋一仁

    砥粒加工学会学術講演会講演論文集  2020 

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  • ビトリファイドcBN砥石のアブレイシブジェットドレッシングに関する研究

    和田大智, 児玉紘幸, 渡邊健一, 鈴江隆幸, 大久保直哉, 大橋一仁

    砥粒加工学会学術講演会講演論文集  2020 

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  • 研削液へのアルカリ高周波還元水の適用に関する研究

    高山一登, 児玉紘幸, 北島厳, 大橋一仁

    日本機械学会中国四国支部総会・講演会講演論文集  2019 

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  • アブレイシブジェットによるマイクロ形状制御パターニング 第2報:スリットによる微細スロープ動圧溝の高精度化

    和田大智, 中前翔太, 児玉紘幸, 大橋一仁

    砥粒加工学会学術講演会講演論文集(CD-ROM)  2019 

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  • CFRPの研削加工に及ぼす研削雰囲気の影響

    岡崎真吾, JIANG Yifan, 児玉紘幸, 余田裕之, 大橋一仁

    砥粒加工学会学術講演会講演論文集(CD-ROM)  2019 

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  • 総形単層メタルボンドダイヤモンド砥石の砥粒配置に関する研究(続報)-総形研削の除去量を考慮した最適砥粒分布の検討-

    吉田高太, 辰本大輔, 児玉紘幸, 大橋一仁

    精密工学会大会学術講演会講演論文集  2019 

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  • 熱可塑性樹脂ボンド砥石による単結晶SiCウェハの研削特性

    小川和範, 高凌霄, 坂井孝三, 児玉紘幸, 大橋一仁

    精密工学会大会学術講演会講演論文集  2019 

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  • CFRPの研削加工における熱影響のシミュレーション

    JIANG Yifan, 児玉紘幸, 余田裕之, 大橋一仁

    精密工学会大会学術講演会講演論文集  2018 

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  • 微粉ドライアイスブラストによるカーボン研削砥石の目詰まり切りくず除去法 第2報:砥石の切れ味の検討

    片山雄登, 太田佑樹, 児玉紘幸, 大橋一仁

    砥粒加工学会学術講演会講演論文集(CD-ROM)  2017 

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  • アブレイシブジェットによるマイクロ形状制御パターニング 深さの連続変化するヘリングボーンジャーナル溝の加工

    中前翔太, 原田真志, 児玉紘幸, 大橋一仁

    砥粒加工学会学術講演会講演論文集(CD-ROM)  2017 

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  • 単層メタルボンドダイヤモンド砥石の砥粒配置に関する研究(第1報)-静電場を用いた総形砥石の砥粒密度分布の制御-

    辰本大輔, 渡邉智, 児玉紘幸, 大橋一仁

    精密工学会大会学術講演会講演論文集  2017 

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Awards

  • 優秀研究者賞

    2024.3   精密工学会中国四国支部   難削材料の切削・研削加工現象の解明およびデータ駆動型ものづくりシステムに関する開発

    児玉紘幸

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  • 教育貢献賞

    2024.3   岡山大学   コースの教育研究の将来を検討した提言に対する教育貢献

    河原信幸, 岡安光博, 岡田晃, 鈴木博貴, 児玉紘幸, 坂本惇司,磯部和真,楊家家

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  • ベストティーチャー賞

    2023.4   岡山大学工学部  

    児玉 紘幸

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  • ベストオーガナイザー賞

    2023.3   公益財団法人 精密工学会   「加工のデータサイエンスとAI」

    澤 武一, 吉原 信人, 児玉 紘幸, 尾嶌 裕隆

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  • 第5回 岡山テックプラングランプリ (企業賞)KOBASHI HOLDINGS賞

    2023.2   ㈱リバネス ㈱中国銀行   ものづくりの意思決定支援システムの開発

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  • 優秀講演論文表彰

    2020.8   砥粒加工学会   ランダムフォレスト手法を用いた砥石決定支援システムの内挿予測精度評価

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  • Excellent Paper Award

    2019.12   The 22nd Int. Symposium on Advances in Abrasive Technology  

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  • 奨励賞

    2019.8   砥粒加工学会   データマイニングに支援されたモノづくりシステムに関する研究

    児玉紘幸

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  • Best Article Award

    2012.12  

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  • ベストプレゼンテーション賞

    2011.3   精密工学会関西支部   非階層・階層型クラスタリング手法を併用したエンドミル切削条件の決定法と実験的検証

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  • 優秀論文表彰

    2011.3   マザック財団   Cutting Condition Methodology Based on Data Mining of Tool Catalog Data

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  • 優秀講演論文表彰

    2011.3   砥粒加工学会   データマイニングによるエンドミル切削条件の決定法 工具カタログデータの非階層・階層クラスタリングの併用効果

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  • 学生研究奨励賞

    2010.11   ㈱NTTデータ数理システム   データマイニングを用いたエンドミル切削条件決定の効果

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Research Projects

  • 工具摩耗状態の大局的情報構造可視化技術を援用した工具寿命予測システムの開発

    Grant number:25K07515  2025.04 - 2028.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    児玉 紘幸

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    Grant amount:\4550000 ( Direct expense: \3500000 、 Indirect expense:\1050000 )

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  • パワー半導体材料の超精密研削を実現する熱可塑性樹脂ボンド砥石の有気孔化と性能評価

    Grant number:24K07269  2024.04 - 2027.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    大橋 一仁, 児玉 紘幸

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    Grant amount:\4680000 ( Direct expense: \3600000 、 Indirect expense:\1080000 )

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  • Development of Electroplated Face Grinding Wheel Aiming Both High-Efficiency and High-Accuracy for Cemented Carbide

    Grant number:JPMJTM2020FV  2020.11 - 2022.03

    JST  研究成果展開事業 A-STEPトライアウト  生産加工技術分野

    藤原貴典, 小松原, 凌, 大橋一仁, 児玉紘幸, 大西 孝, 前田知洋

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  • 次世代半導体材料の超精密研削における砥石結合剤の粘弾性の効果

    Grant number:20K04193  2020.04 - 2023.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    大橋 一仁, 児玉 紘幸, 大西 孝

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    Grant amount:\4290000 ( Direct expense: \3300000 、 Indirect expense:\990000 )

    次世代半導体材料の超精密研削を実現するために,昨年度に試作した熱可塑性樹脂を結合剤とする研削砥石の力学的特性を実験により検討し,単結晶SiCウエハの研削性能との相関を検討した.具体的には,結合剤である軟化点温度の異なる熱可塑性樹脂を用いて3種類の短冊状サンプルを作成し,レオメータによる粘弾性の特徴的な5つの温度条件において3点曲げ試験を実施した.その結果,環境温度により応力/ひずみ線図の形態が大きく異なり,粘弾性試験による弾性に対する粘性の割合(損失正接:tanδ)が大きい温度環境では結合剤のサンプルが破断まであるいは破断することなく大きく変形するクリープに近い状態を示すことが明らかになった.得られた応力/ひずみ線図から,破断までのエネルギー(じん性)を求めた結果,概ねじん性はtanδと相関を有し,tanδが大きい,すなわちじん性の大きな温度条件ほど単結晶SiCウエハの研削面粗さは小さいことが明らかとなった.その一方で,熱可塑性樹脂の種類によってはじん性とtanδとの相関が認められないものもあった.また,熱可塑性樹脂のブレンドの配合を変えた砥石も試作し,研削実験を行った結果,ポリプロピレンの配合割合が多くても少なくても単結晶SiCウエハの研削面粗さは大きくなる傾向が確認され,最適な配合割合のあることが明らかになった.
    なお,いずれの条件においても平均粒径6ミクロンのダイヤモンド砥粒を用いて研削した単結晶SiCウエハの研削面粗さSaはシングルナノメートルからそれ以下であり,ビトリファイドボンドの同砥粒を用いた砥石の場合よりも良好であった.

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  • Development of Grinding Wheel Decision Support System Using Data-mining Method

    Grant number:18K13672  2018.04 - 2021.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Early-Career Scientists

    Kodama Hiroyuki

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    Grant amount:\4160000 ( Direct expense: \3200000 、 Indirect expense:\960000 )

    In this study, we used random forest, a data mining method, to construct a system that can determine the abrasive grain, grain size, and bonding strength from various combinations of material property values. In addition, the usefulness of the system was verified. The verification was carried out by grinding experiments on general materials and difficult-to-cut materials using the recommended grinding wheels by the system. As a result of a grinding experiment of Inconel 718, which is a difficult-to-cut material that does not exist in the learning database, the amount of wear of the recommended grinding wheels (PA) was reduced by 12%. From this result, we were able to verify the usefulness of this system constructed by random forest method.

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  • High Efficiency and High Quality Dry Grinding of Carbon Fiber Reinforced Plastic

    Grant number:17K06080  2017.04 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Ohashi Kazuhito

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    Grant amount:\4810000 ( Direct expense: \3700000 、 Indirect expense:\1110000 )

    In this study, we proposed the dry grinding of carbon fiber reinforced plastic (CFRP) using the dry ice jet blowing on a diamond grinding wheel surface in the grinding process. As a result, it was experimentally clarified that the dry ice jet controls the wheel loading due to grinding of CFRP to lead the extent of wheel life and the increase of ground surface quality rather than the normal dry grinding. Furthermore, it was confirmed that some carbon fibers on the ground surface were finely crushed in wet grinding.

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  • Development of Optimization Technique for Difficult-to-cut Material Processing Technology Using Tool Catalog Data-mining System

    Grant number:15K17952  2015.04 - 2018.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    Kodama Hiroyuki

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    Grant amount:\4420000 ( Direct expense: \3400000 、 Indirect expense:\1020000 )

    The data-mining methods using hierarchical and non-hierarchical clustering methods to help engineers decide appropriate end-milling conditions were proposed in this study. The aim of our research is to construct a system that uses clustering techniques and tool catalog data to support the decision of end-milling conditions for difficult-to-cut materials. We used the K-means method and variable cluster analysis to find tool shape parameters that had a significant relationship with the end-milling conditions listed in the catalog. We used both the principal component analysis and the response surface method to derive end-milling condition by suing significant tool shape parameters obtained by clustering. Milling experiments using a square end mill under two sets of end-milling conditions for difficult-to-cut materials showed that catalog mining can be used to derive guidelines for deciding end-milling conditions.

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  • データマイニング支援ものづくりシステム・工具D/Bからのカタログマイニング

    Grant number:12J00106  2012 - 2013

    日本学術振興会  科学研究費助成事業  特別研究員奨励費

    児玉 紘幸

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    Grant amount:\1800000 ( Direct expense: \1800000 )

    本研究では, 非熟練技能者を対象に切削条件や使用工具形状(直径, 全長, 刃長, 刃数)の選定を支援するために, 工具カタログデータに, 階層・非階層型のクラスタリング手法を適用することで, 切削条件決定を支援できるシステムの提案を行った. また, これらのデータマイニングプロセスにおいて新知識の発掘を目的とする. 非階層型のクラスタリング手法であるK-means法によって工具カタログから形状ごとにクラスタ分けし, その各形状クラスタに対して, 変数クラスタ分析によって有意な変数を選択し, 分析した結果に基づいて切削条件を決定できる実用式を導出して考察した, データマイニング手法をものづくりの現場に適用するために, 生産現場で容易に入手可能な膨大なデータベースとして工具カタログデータに着目した. 工具カタログは毎年工具メーカによりデータベースが更新されるだけでなく, 工具メーカの技術者の加工に関する知識も潜む良質なデータベースと考えられるからである. 特にエンドミル工具に対してデータマイニング手法を適用するためのカタログマイニング手法を適用した. 本手法を用いることで, 金型加工の工程設計において粗加工から中粗加工までを内包した, 非熟練技能者にとって指針となるスクエアエンドミルおよびボールエンドミルの切削条件の導出が可能となった. スクエアエンドミルを対象とした粗加工においては, カタログマイニングによって導出される推奨条件を用いることにより, 切削の初期段階で行われる試行錯誤的な実験を削減できるため, 環境影響負荷を低減することが可能になることが示せた. またカタログマイニングの結果, 金型鋼以外にも, 超耐熱合金などに代表される難削材料に関して, 切削の初期段階で実用的な切削条件の導出が可能となることが示せた.

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