2021/10/08 更新

写真a

オオニシ タカシ
大西 孝
OONISHI Takashi
所属
自然科学学域 助教
職名
助教
外部リンク

学位

  • 博士(工学) ( 岡山大学 )

研究キーワード

  • 研削

  • 工作機械

研究分野

  • ものづくり技術(機械・電気電子・化学工学) / 加工学、生産工学

 

論文

  • Improvement of form accuracy in cylindrical traverse grinding with steady rest by controlling traverse speed 査読

    Hidetaka Fujii, Takashi Onishi, Chinhu Lin, Moriaki Sakakura, Kazuhito Ohashi

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   15 ( 4 )   2021年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    In cylindrical traverse grinding, a slender workpiece is bent by the normal grinding force due to its low stiffness. Consequently, a form error is generated by the elastic deformation of the workpiece during the grinding process. To prevent such deformation of the workpiece, a steady rest is generally used. However, when the contact point between the workpiece and the steady rest is ground, the pushing force of the steady rest is lost, and the elastic deformation of the workpiece is increased immediately. As a result, a step shape error is generated at the contact point. To improve the use of the steady rest, the elastic deformation of the workpiece during the grinding process is simulated using the beam model considering the steady rest in this study. From the analysis results, it was determined that placing the steady rest outside the grinding part can reduce the elastic deformation of the workpiece. In addition, the traverse speed was controlled to maintain a constant elastic deformation. Through grinding experiments, it was confirmed that the form accuracy of the slender workpiece was improved by setting the steady rest outside the grinding part and adjusting the traverse speed.

    DOI: 10.1299/jamdsm.2021jamdsm0049

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  • Accurate estimation of workpiece dimension in plunge grinding without sizing gauge 査読

    Takashi Onishi, Yuki Murata, Kohei Fujiwara, Moriaki Sakakura, Kazuhito Ohashi

    Precision Engineering   2021年

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    掲載種別:研究論文(学術雑誌)  

    In the cylindrical grinding process, the residual grinding allowance is left owing to the rubbing of the abrasive grains and the elastic deformation of the grinding system caused by the large normal grinding force. Therefore, a sizing gauge is generally used to monitor the workpiece diameter during the process. However, the sizing gauge disturbs the grinding operations, such as loading and unloading the workpiece. In this study, a new method for estimating the grinding stock of a ground workpiece is proposed. In the proposed method, the grinding stock can be estimated without a sizing gauge. The removed volume of the workpiece can be calculated from the power consumption of the wheel motor, which is easily measured. Before the grinding experiments, the specific grinding energy is determined from several grinding results. During the grinding process, the grinding stock of the ground workpiece was estimated using the determined specific grinding energy. It was confirmed that the grinding stock could be accurately estimated under several grinding conditions.

    DOI: 10.1016/j.precisioneng.2021.08.012

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  • Improvement of the Form Accuracy of a Slender Workpiece in Cylindrical Traverse Grinding 査読

    Takashi Onishi, Teppei Takashima, Moriaki Sakakura, Koichi Sakamoto, Kazuhito Ohashi

    INTERNATIONAL JOURNAL OF AUTOMATION TECHNOLOGY   13 ( 6 )   728 - 735   2019年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:FUJI TECHNOLOGY PRESS LTD  

    During the cylindrical traverse grinding of a slender workpiece, the ground workpiece is easily bent by the normal grinding force owing to its low stiffness. Therefore, it is difficult to finish the slender workpiece with high accuracy. To prevent the elastic deformation of a workpiece during the grinding process, a steady rest is generally used. However, considerable skill of the worker is required to use a steady rest. Therefore, we developed a new traverse grinding method without any steady rest. In this method, the elastic deformation of a workpiece was kept constant by controlling the traverse speed of the workpiece. At the middle of the ground workpiece, where the elastic deformation increased easily, the traverse speed was slowed down. However, this method had a longer grinding cycle time because the average traverse speed decreased compared to that of the conventional method. To shorten the cycle time, the peripheral speed of the grinding wheel was increased to decrease the normal grinding force. Basic grinding experiments were carried out under several grinding conditions by changing the peripheral speed of the wheel. From these grinding experiments, it was confirmed that the normal grinding force and the form error of the ground workpiece decreased as the peripheral wheel speed increased. By using results obtained from basic experiments, grinding experiments involving changes in the traverse speed were carried out at two peripheral wheel speeds. The grinding cycle time was reduced successfully by increasing the peripheral wheel speed without an increment in the form error of the ground workpiece. Furthermore, a form error was observed at the end of the workpiece where the grinding wheel traveled away from the workpiece. The form error occurred because the normal grinding force decreased rapidly when the contact length between the workpiece and the wheel was decreased at the end of the workpiece. To prevent rapid changes in the normal grinding force, the traverse speed of the workpiece was increased at the end of the workpiece. By using this method, a ground workpiece with high form accuracy was obtained.

    DOI: 10.20965/ijat.2019.p0728

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  • Development of the intelligent cylindrical grinding system considering the thermal deformation of a workpiece 査読

    Takashi ONISHI, Moriaki SAKAKURA, Takuo OKANOUE, Kohei FUJIWARA, Yasuhiro FUJIYAMA, Kazuhito OHASHI

    Journal of Advanced Mechanical Design, Systems, and Manufacturing   12 ( 5 )   1 - 8   2018年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • 長尺工作物の円筒トラバース研削における形状精度の改善 -工作物の弾性変形を考慮したトラバース速度の制御- 査読

    大西 孝, 小谷拓也, 坂倉守昭, 大橋一仁, 髙島哲平, 塚本真也

    砥粒加工学会誌   60 ( 10 )   2016年10月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • 円筒プランジ研削における工作物熱変形量のシミュレーション解析 -砥石軸モータの電力を用いた研削抵抗の推定- 査読

    大西 孝, 坂倉守昭, 和田洋平, 佐藤直樹, 大橋一仁, 塚本真也

    精密工学会誌   82 ( 1 )   2016年1月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • 円筒研削における工作物熱変形量を考慮した加工システムの開発 -種々の条件における寸法精度の検証- 査読

    大西 孝, 坂倉守昭, 藤山泰弘, 大橋一仁, 塚本真也

    砥粒加工学会誌   59 ( 10 )   2015年10月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • Experimental study of the causes for shape error of a large workpiece machined by surface grinding 査読

    Takashi Onishi, Yoshiyuki Shimizu, Moriaki Sakakura, Makoto Harada, Yusuke Nakano, Shinsuke Baba, Kazuhito Ohashi, Shinya Tsukamoto

    Advanced Materials Research   806   597 - 600   2015年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • In-process monitoring of the machining state in superfinishing by measuring the dynamic machining forces 査読

    Takashi ONISHI, Kazuhito OHASHI, Kohei HIGASHI, Yohei MORINAKA, Shinichi BANNO, Takakazu KITAGAWA, Shinya TSUKAMOTO

    Advanced Materials Research   806   592 - 596   2015年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Study on the shape error in the cylindrical traverse grinding of a workpiece with high aspect ratio 査読

    Takashi Onishi, Takuya Kodani, Kazuhito Ohashi, Moriaki Sakakura, Shinya Tsukamoto

    Advanced Materials Research   1017   78 - 81   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Trans Tech Publications Ltd  

    In cylindrical traverse grinding of a long workpiece with high aspect ratio, the shape accuracy of a workpiece worsens due to its low stiffness. In this study, the grinding force was measured during grinding process to calculate the elastic deformation of a workpiece caused by the normal grinding force. By comparing calculated elastic deformation with the measured shape error of ground workpiece, the cause for the shape error in case of grinding a long workpiece was investigated experimentally. From experimental results, it is confirmed that the main factor of the shape error of the long workpiece is its elastic deformation during grinding process.

    DOI: 10.4028/www.scientific.net/AMR.1017.78

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  • Study on Grinding Force Distribution on Cup Type Electroplated Diamond Wheel in Face Grinding of Cemented Carbide 査読

    Takanori FUJIWARA, Shinya TSUKAMOTO, Kazuhito OHASHI, Takashi ONISHI

    Advanced Materials Research   1017   9 - 14   2014年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

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  • Development of an advanced machine control system in superfinishing the automatic determination of the suitable machining time 査読

    Takashi Onishi, Kazuhito Ohashi, Kohei Higashi, Takahiro Iguchi, Shingo Yamashita, Hajime Isa, Shinya Tsukamoto

    Advanced Materials Research   1017   515 - 519   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Trans Tech Publications Ltd  

    In superfinishing, a fine surface can be obtained by transiting the machining states from the cutting action to the finishing one. In this study, we propose an advanced machine control system in superfinishing. The superfinishing stone is retracted automatically when the proposed system detects improvement in the surface roughness of the workpiece. The suitable machining time is determined by monitoring the machining force ratio measured with a force sensor. With machining experiments, we confirm that the finished surface roughness can be controlled by adjusting the threshold value of the machining force ratio to retract the superfinishing stone during machining.

    DOI: 10.4028/www.scientific.net/AMR.1017.515

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  • Temperature distribution in a workpiece during cylindrical plunge grinding 査読

    Moriaki Sakakura, Takashi Onishi, Takayuki Shinoda, Kazuhito Ohashi, Shinya Tsukamoto, Ichiro Inasaki

    Production Engineering   6 ( 2 )   149 - 155   2012年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    In cylindrical plunge grinding, a large amount of heat flows into the workpiece continuously, accumulates and remains even after the process, which causes dimensional error. Therefore it is necessary to investigate the temperature distribution in the workpiece during grinding and analyze the influence of grinding heat on the dimension. Such an investigation has not been done enough, because the technology to measure the temperature distribution in the rotating workpiece has not matured. Considering such background, an in-process measuring system has been developed, which makes it possible to detect the temperature distribution in a wide range from the outer surface to the inside of the rotating workpiece. The system consists of small temperature sensors which are embedded into the workpiece, a micro computer attached on the workpiece which acquires the data from the sensors and transmits to a personal computer by a wireless communication device. Furthermore the contact type thermocouple which enables to measure the rotating surface temperature is added to the system. Measurement experiments revealed that the grinding heat conducts from the workpiece surface toward the center, accumulates, and remains in the workpiece even after the process. Heat conduction simulation was also performed. Good agreement was achieved between the simulated temperatures and experimental measurements. © 2012 German Academic Society for Production Engineering (WGP).

    DOI: 10.1007/s11740-012-0372-z

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  • 円筒プランジ研削における工作物表面温度のインプロセス測定結果を用いた熱変形量の予測システムの開発 査読

    大西 孝, 坂倉守昭, 佐伯哲弥, 谷村賢彦, 和田洋平, 大橋一仁, 塚本真也

    砥粒加工学会誌   55 ( 7 )   2011年7月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • 円筒プランジ研削における工作物温度分布および工作物熱変形量のシミュレーションとインプロセス測定 査読

    大西 孝, 坂倉守昭, 篠田崇幸, 和田洋平, 大橋一仁, 塚本真也

    砥粒加工学会誌   55 ( 3 )   161 - 166   2011年3月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

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  • Development of a 45° tilted on-machine measuring system for small optical parts 査読

    H. Suzuki, T. Onishi, T. Moriwaki, M. Fukuta, J. Sugawara

    CIRP Annals - Manufacturing Technology   57 ( 1 )   411 - 414   2008年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    A new contact type of on-machine measuring system is developed in order to measure aspherical optical parts with steep surface angle for large numerical aperture (NA). A ceramic air slider made of SIALON is adopted for the measurement probe because of its low thermal expansion coefficient, high rigidity and light weight. A high accuracy glass scale is employed to reduce the thermal drift of the displacement gauge. The air slider or the measuring probe is tilted for 45° against the aspherical workpiece axis, and the probe is scanned over the workpiece surface, so as to keep the contact angle between the probe axis and the contact surface constant in order to reduce the change in the probe friction force. © 2008.

    DOI: 10.1016/j.cirp.2008.03.041

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  • Precision grinding of microarray lens molding die with 4-axes controlled microwheel 査読

    Yuji Yamamoto, Hirofumi Suzuki, Takashi Onishi, Tadashi Okino, Toshimichi Moriwaki

    SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS   8 ( 3 )   173 - 176   2007年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:NATL INST MATERIALS SCIENCE  

    This paper deals with precision grinding of microarray lens (fly eye) molding die by using a resinoid bonded diamond wheel. An ultra-precision grinding system of microarray lens molding die and new truing method of resinoid bonded diamond wheel were developed. In this system, a grinding wheel was four-dimensionally controlled with 1 nm resolution by linear scale feedback system and scanned on the workpiece surface. New truing method by using a vanadium alloy tool was developed and its performance was obtained with high preciseness and low wheel wear. Finally, the microarray lens molding dies of fine grain tungsten carbide (WC) was tested with the resinoid bonded diamond wheel to evaluate grinding performance. (C) 2007 Published by NIMS and Elsevier Ltd.

    DOI: 10.1016/j.stam.2007.02.007

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  • マイクロ円筒トラバース研削の高精度化に関する研究 査読

    大橋一仁, 何 桂馥, 光尾 崇, 吉原啓太, 大西 孝, 塚本真也

    砥粒加工学会誌   50 ( 6 )   334 - 339   2006年6月

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    記述言語:日本語   掲載種別:研究論文(国際会議プロシーディングス)  

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受賞

  • 18th International Conference on Precision Engineering (ICPE2020) Best Paper Award

    2020年11月   精密工学会  

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  • 奨励賞

    2014年9月   砥粒加工学会  

    大西 孝

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  • 工作機械技術振興賞(奨励賞)

    2014年6月   工作機械技術振興財団  

    大西 孝

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  • マザック高度生産システム優秀論文賞

    2012年6月   マザック財団  

    大西 孝

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  • The 14th International Machine Tool Engineers’ Conference, Excellent Poster Award

    2010年10月  

    大西 孝

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  • 工作機械技術振興賞(論文賞)

    2007年6月   工作機械技術振興財団  

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  • 論文賞

    2007年3月   砥粒加工学会  

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共同研究・競争的資金等の研究

  • 長尺工作物の円筒トラバース研削における振れ止めの使用方法の最適化に関する研究

    研究課題/領域番号:20K04194  2020年04月 - 2023年03月

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    大西 孝, 大橋 一仁

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    担当区分:研究代表者 

    配分額:4290000円 ( 直接経費:3300000円 、 間接経費:990000円 )

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  • 定寸装置を不要とする知能化研削システムの開発

    研究課題/領域番号:15K17951  2015年04月 - 2018年03月

    日本学術振興会  科学研究費助成事業 若手研究(B)  若手研究(B)

    大西 孝, 坂倉 守昭, 大橋 一仁, 髙島 哲平, 西 空也, 岡上 拓央, 坂本 晃一, 藤原 昂平, 中林 優介

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    担当区分:研究代表者 

    配分額:4290000円 ( 直接経費:3300000円 、 間接経費:990000円 )

    本研究は,円筒プランジ研削において(1)工作物の熱変形,(2)工作物の切残し の2点を研削中にシミュレーション解析し,工作機械にフィードバックすることで定寸装置がなくとも,研削中に寸法生成量を正確に予測できる知能化システムの開発を目的としている.本研究の結果,工作物の熱変形が半径で数μm生じる場合においても,目標とする寸法との誤差を半径で0.5μm以下に抑制できることを確認した.同時に,工作物系の弾性変形切り残し量を1μm程度の精度で予測できることを確認した.さらに本研究を応用して,長尺工作物の円筒研削や高アスペクト比を有する内面研削における工作物の形状精度を改善できる手法を考案した.

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  • 長尺工作物の知能化研削システムの開発

    研究課題/領域番号:24860044  2012年08月 - 2014年03月

    日本学術振興会  科学研究費助成事業 研究活動スタート支援  研究活動スタート支援

    大西 孝

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    担当区分:研究代表者 

    配分額:2990000円 ( 直接経費:2300000円 、 間接経費:690000円 )

    本研究では弾性変形により形状誤差が発生しやすい長尺工作物の円筒トラバース研削における形状制度の改善を目的として,形状誤差発生要因を解明するとともに,研削盤の新たな制御方法の効果を実験的に検証した.その結果,研削中に工作物へ作用する研削抵抗を測定することで長尺工作物の形状誤差を容易に予測できることが確認された.さらに工作物の弾性変形量が一定になるようにトラバース速度を制御することで,形状誤差を従来の半分に減らすことに成功した.

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担当授業科目

  • 技術表現法 (2021年度) 第4学期  - 月3,月4,木1,木2

  • 技術表現法 (2021年度) 第4学期  - 月3~4,木1~2

  • 機械システム工学演習1 (2021年度) 前期  - その他

  • 機械システム工学演習2 (2021年度) 後期  - その他

  • 技術表現法 (2020年度) 第4学期  - 月3,月4,木1,木2

  • 技術表現法 (2020年度) 第4学期  - 月3,月4,木1,木2

  • 機械システム工学演習1 (2020年度) 前期  - その他

  • 機械システム工学演習2 (2020年度) 後期  - その他

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