研究者詳細 - 大橋　一仁

論文 - 大橋　一仁

分割表示 182 件中 61 - 80 件目／全件表示 >>

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

Decision support system for principal factors of grinding wheel using data-mining methodology 査読

Hiroyuki Kodama, Itaru Uotani, Kazuhito Ohashi

Proceedings of the 21st International Symposium on Advances in Abrasive Technology (ISAAT2018) 9 ( 2 ) 89 - 98 2018年10月

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）

© ISAAT 2018 - 21st International Symposium on Advances in Abrasive Technology. All rights reserved. The recommended grinding conditions are described in five factors (abrasive grain, grain size, grade, structure, and bonding material) of the three main elements (abrasive grain, bonding material, and pore) in the grinding wheel catalog data-set. As 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. In this report, we produced patterns to support selection of grinding wheels by visualizing the surface grinding wheel selection decision tendency from more amount of data, based on data mixed with JIS (Japan Industrial Standards) and maker's catalog data.

DOI： 10.1504/IJAT.2019.101399

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Influence of Grinding Atmosphere on Grinding Characteristics of CFRP (Effect of Soluble Coolant or Liquid Nitrogen Supply) 査読

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

Proceedings of 2018 International Conference on Machining, Materials and Mechanical Technologies (2018 IC3MT) 105 - 109 2018年9月

Decision support system for grinding wheel selection using data-mining 査読

Hiroyuki Kodama, Kazuhito Ohashi, Itaru Uotani

Proceedings of euspen’s 18th International Conference & Exhibition 213 - 214 2018年6月

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）

© 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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Recovery of grindactivity by dry ice blasting on micro-grit diamond wheel in dry grinding of carbon 査読

Yuto Katayama, Yuki Ohta, Hiroyuki Kodama, Kazuhito Ohashi

ISAAT 2017 - Proceedings of the 20th International Symposium on Advances in Abrasive Technology 76 - 80 2017年12月

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）

© ISAAT 2017.All right reserved. In dry grinding of hard carbon parts with micro-grit diamond wheels, carbon chips adhere to the wheel surface and the grindactivity of diamond wheel is remarkably lost in a short time. There blunt diamond wheels after wheel loading have an influence on the grinding results such as the stock removal, the surface roughness of workpiece. Generally, the grinding ability of diamond wheel in which the wheel loading occurs is recovered by the dressing. However, the dressing removes not only carbon chips but also abrasive grains under carbon chips, which have enough cutting performance. Since the dressing increases irrelevant wheel wear in this case, dressing is not desirable from the viewpoint of total life of grinding wheel and manufacturing cost. The carbon chips on wheel surface could be also removed by the organic solvent cleaning, however it is undesirable for working environments. The purpose of this research is to clean up carbon chips on wheel surface by dry ice blasting for dry grinding. In addition, the recovery of grindactivity after dry ice blasting was investigated. Dry ice hardly affects the environment and workers because dry ice sublimes to carbon dioxide. In this paper, the grindactivity of micro-grit diamond wheels clean up by dry ice blasting is investigated, analyzing surface roughness of workpiece, stock removal and tangential force in grinding tests. In addition, the grindactivity of wheels treated by other methods is investigated. As a result, the dry ice blasting can remove carbon chips accumulated on micro-grit diamond wheel enough to recover the grindactivity of wheel with normal surface roughness, stock removal and tangential force as before wheel loading.

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Improvement of shape accuracy in internal grinding with slender grinding wheel 査読

Takashi Onishi, Kuya Nishi, Moriaki Sakakura, Kazuhito Ohashi

ISAAT 2017 - Proceedings of the 20th International Symposium on Advances in Abrasive Technology 958 - 961 2017年12月

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）

© ISAAT 2017.All right reserved. The shape error of the ground workpiece worsens in case of internal grinding with a slender grinding wheel. In this study, we propose a new grinding system to improve the shape accuracy of the ground workpiece, where the grinding force was estimated previously to minimize the shape error. Considering the effect of wheel wear and wheel run-out on the shape error, the optimized grinding force was obtained by simulating the wheel wear before grinding. Grinding experiments were carried out to verify the proposed system which successfully reduced shape error of the workpiece.

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Development of the grinding wheel decision support system using data mining method 査読

Hiroyuki Kodama, Koichi Okuda, Kazuhito Ohashi

Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2017 2017年11月

掲載種別：研究論文（国際会議プロシーディングス）

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.

DOI： 10.1299/jsmelem.2017.9.009

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Development of intelligent cylindrical grinding system considering thermal deformation of workpiece 査読

Takashi Onishi, Moriaki Sakakura, Takuo Okanoue, Yasuhiro Fujiyama, Kazuhito Ohashi

Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2017 12 ( 5 ) 2017年11月

掲載種別：研究論文（国際会議プロシーディングス）

In cylindrical grinding, thermal deformation of a ground workpiece can reduce the size accuracy. To improve the size accuracy, it is necessary to consider the thermal deformation during grinding process. In this study, we develop an intelligent grinding system that can consider the thermal deformation of the ground workpiece. In this system the thermal deformation of the workpiece is simulated during grinding process. The thermal deformation is simulated from the measured grinding force. Grinding force is measured by the strain gauges mounted on the race center. The grinding heat conducted into the ground workpiece is estimated from the measured normal grinding force. The net stock removal, that is the stock removal measured after the workpiece is cooled, is estimated by adding the measured stock removal and simulated thermal deformation of the workpiece. To obtain the target stock removal, the grinding wheel is retracted as the net stock removal is reached to the target stock removal. With using the developed grinding system, grinding experiments were carried out. In these grinding experiments, the size error is reduced less than 1 micro meter in radius even though the thermal deformation is more than 2 micro meters in radius. With grinding experiments, it is confirmed that the developed grinding system can improve the size accuracy successfully.

DOI： 10.1299/jsmelem.2017.9.143

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Efficiency Investigation of Removal of Loading Carbon Chips on Wheel Surface Using Dry Ice Blasting 査読

Yuki Ohta, Soziro Murakawa, Kazuhito Ohashi

Key Engineering Materials 749 124 - 129 2017年8月

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, 小谷拓也, 坂倉守昭, 大橋一仁, 高島哲平, 塚本真也

砥粒加工学会誌 60 ( 10 ) 551 - 556 2016年10月

Estimation of the Shape Error in Internal Grinding by High aspect Ratio Grinding Wheel 査読

Takashi Onishi, Moriaki Sakakura, Kazuki Oda, Kuya Nishi, Kazuhito Ohashi

Proceedings of 2016 International Conference on Machining, Materials and Mechanical Technologies (2016 IC3MT) 2016年10月

Improvement in the Shape Error of the Long Workpiece in Cylindrical Traverse Grinding 査読

T. Takashima, T. Onishi, M. Sakakura, K. Ohashi, S. Tsukamoto

Proceedings of 19th International Symposium on Advances in Abrasive Technology (ISAAT2016) 307 - 313 2016年10月

Efficiency Investigation of Removal ofLoading Carbon Chips onWheel Surface Using DryIce Blasting 査読

Y.Ohta, S.Murakawa, K.Ohashi

Proceedings of 2016 International Conference on Machining, Materials and Mechanical Technologies (2016 IC3MT) 2016年10月

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(Web) 82 ( 1 ) 70 - 74 2016年1月

Simulation analysis of thermal deformation of a workpiece during cylindrical plunge grinding - Estimating the grinding force from the power consumption of the wheel motor

Takashi Onishi, Moriaki Sakakura, Yohci Wada, Naoki Sato, Kazuhito Ohashi, Shinya Tsukamoto

Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering 82 ( 1 ) 70 - 74 2016年

掲載種別：研究論文（学術雑誌）

In cylindrical plunge grinding, the dimensional accuracy of a workpiece is reduced due to its thermal deformation. Therefore, it is necessary to simulate the thermal deformation of a workpiece during grinding in order to obtain high accuracy. To calculate the thermal deformation of a workpiece, we propose a new simulation method, in this method, the thermal deformation of a workpiece is calculated with the tangential grinding force that can be estimated easily from the measured power consumption of the wheel motor. Grinding experiments were carried out in several grinding conditions to verify the proposed method. Good agreement was achieved between the simulated thermal deformation of the workpiece and the experimental results in each grinding condition.

DOI： 10.2493/jjspe.82.70

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Investigation of thermal environment at grinding point of CFRP 査読

Ryosuke Tani, Kazuhito Ohashi, Mitsuo Yoshikawa, Shinichiro Kubota, Shinya Tsukamoto

Proceedings of the 8th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2015 E38 2015年10月

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）

In machining of CFRP, the delamination occurs at interfaces between matrix resin and carbon fibers due to the machining heat causes a deterioration of the surface quality because of poor heat resistance of matrix resin. However, the thermal environments of CFRP at the machining point haven't been made clear enough. In this study, the grinding temperature is measured in grinding of CFRP under dry and wet with vitrified bond diamond wheel. Furthermore, variations of the instantaneous heat transfer coefficients at the grinding point are calculated based on the grinding temperature data, and the effect of grinding atmosphere on the heat transfer characteristics at the grinding point is investigated experimentally.

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Dimensional error analysis for grinding of a cylindrical long workpiece 査読

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

Proceedings of the 8th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2015 2015年10月

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）

In cylindrical grinding for a long workpiece, the elastic deformation of the workpiece reduces the shape accuracy because of its low stiffness. Therefore, it is very important to analyze the elastic deformation of the workpiece during grinding process. In this study, an advanced analyzing method of the shape error in case of a long workpiece was proposed. In the proposed method, the normal grinding force, which is the important factor for the elastic deformation of the workpiece, was estimated from the power consumption of the wheel motor. To evaluate the proposed analysis method, the analyzed shape error was compared with measured shape error obtained by grinding experiment.

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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研削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 ) 594 - 599 2015年10月

Control of Machining Profiles Based on Material Removal Capabilities in Cylindrical Blasting 査読

Masashi HARADA, Kazuhito OHASHI, Taketo FUKUSHIMA, Shinya TSUKAMOTO

Applied Mechanics and Materials 806 125 - 130 2015年8月

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

Applied Mechanics and Materials 806 592 - 596 2015年8月

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