研究者詳細 - 大橋　一仁

論文 - 大橋　一仁

分割表示 182 件中 81 - 100 件目／全件表示 >>

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

Applied Mechanics and Materials 806 597 - 600 2015年8月

Forces during Grinding Operation and its Relation to the Dressing Cycle 査読

Anand NAMBIAR, Kou MATSUMOTO, Masaru YAMAMOTO, Kazuhito OHASHI, Shinya TSUKAMOTO

Applied Mechanics and Materials 806 78 - 83 2015年8月

Effect of dry ice blasting on removal of loading carbon chips on wheel surface 査読

Kazuhito Ohashi, Sojiro Murakawa, Sinya Tsukamoto

Key Engineering Materials 656-657 220 - 225 2015年5月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Trans Tech Publications Ltd

© (2015) Trans Tech Publications, Switzerland. In dry grinding of hard carbon parts, the grinding performance of wheel is remarkably lost by carbon chips loading on wheel surface. The deterioration in grinding performance of wheel affects the grinding accuracy and efficiency. Generally, the grinding performance of loading wheel recovers by dressing. However, the dressing is not suitable from a viewpoint of the wheel life and the production cost because many abrasive grains having sharp edges under loading carbon chips on wheel surfaces are lost by dressing. In this study, we propose the application of dry ice blasting as a removal method of loading carbon chips. The dry ice is little influence on the working environment because of the quick sublimation of dry ice particles to carbon dioxide. In addition, the dry ice blasting might be suitable for the chip removal method because the dry ice doesn't remain on wheel surfaces after blasting without the damage of wheel surfaces. The dry ice blasting tests of resinoid bond diamond wheel surface with no grinding performance by loading carbon chips are carried out, and the effects of dry ice blasting on removal of loading carbon chips are investigated, analyzing the protrusion height of abrasive grains, the impact pressure in the dry ice blasting and so on.

DOI： 10.4028/www.scientific.net/KEM.656-657.220

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High-efficient regeneration of grinding performance using adhesive films in dry grinding of carbon 査読

Kazuhito Ohashi, Yuya Takata, Shinya Tsukamoto

Key Engineering Materials 656-657 283 - 288 2015年5月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Trans Tech Publications Ltd

© (2015) Trans Tech Publications, Switzerland. The grinding performance of wheel remarkably decreases by the wheel loading in dry grinding of precision hard carbon parts. When the wheel loading occurs, the dressing is carried out to remove loading chips for generation of the grinding performance. However, many abrasive grains, which have enough cutting ability under loading chips, are removed in dressing. We therefore have developed the wheel surface cleaning using adhesive films without dressing to remove loading carbon chips on wheel surfaces in our previous reports, and the cleaning could achieve the lean regeneration of grinding performance of fine grade diamond wheels. The removing ability of loading chips is improved by increasing the peeling speed of adhesive film, the pressing time of adhesive films or the number of pressing time. However the optimum cleaning condition has not been investigated. In this report, from the viewpoint of efficiency in the treatment, we therefore investigate the optimum rolling press process of adhesive film on loading disc wheel surfaces in dry grinding of carbon. The optimum treatment processes are experimentally made clear, analyzing SPa of cleaned wheel surfaces, which is one of surface roughness parameters having the correlation with the protrusion height of abrasive grains. Furthermore, the effect of the treatment on regeneration of grinding performance is experimentally verified by grinding tests of hard carbons.

DOI： 10.4028/www.scientific.net/KEM.656-657.283

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Simulation analysis and in-process measurement of the workpiece temperature distribution in large surface grinding 査読

Takashi Onishi, Moriaki Sakakura, Yusuke Nakano, Makoto Harada, Kazutoshi Kawakami, Takeshi Sakane, Kazuhito Ohashi, Shinya Tsukamoto

Key Engineering Materials 656-657 353 - 356 2015年5月

記述言語：英語掲載種別：研究論文（学術雑誌）

© (2015) Trans Tech Publications, Switzerland. In surface grinding, the shape error is occurred by the thermal deformation of a ground workpiece. To finish the workpiece with high accuracy, it is necessary to understand the temperature distribution of the workpiece during grinding process. However there is no study to analyze the temperature distribution of a large workpiece during surface grinding process. In this study, an advanced simulation analysis method of the temperature distribution for a large workpiece was developed. In the developed simulation analysis method, the temperature distribution was calculated from the power consumption of the wheel motor. The power consumption can be obtained easily without any specialized equipment. To evaluate the developed simulation analysis method, in-process measurement of the temperature distribution of a large workpiece was also carried out. A large workpiece ground in this study weights about 1.3 tons. The temperature distribution was measured with thermistors mounted in many places of the ground workpiece. At the area close to the grinding surface, it was found that temperature rises immediately after the passage of grinding wheel with measuring the developed in-process measurement system. On the other hand, at the area far from the grinding point, temperature does not change quickly. The in-process measured temperature distribution agreed well with the simulated results.

DOI： 10.4028/www.scientific.net/KEM.656-657.353

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Quick on-machine measurement of ground surface finish available for mass production cylindrical grinding processes 査読

Kazuhito Ohashi, Kazuya Tan, Tomoya Ashida, Shinya Tsukamoto

International Journal of Automation Technology 9 ( 2 ) 176 - 183 2015年3月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Fuji Technology Press

In mass production cylindrical grinding operations, the ground surface finish has never been measured in each grinding cycles because existing surface roughness testers take a relatively long time to measure surface finishes, and the introduction of a surface roughness tester in each grinding cycle would affect mass production processes. Therefore, the surface finish of all parts manufactured in a production lot is generally evaluated based on the measured results of only few parts by sampling checks. We have proposed a unique quick technique for measuring surface roughness. It uses electromotive force based on the slight frictional heat to evaluate the surface finish of cylindrical workpieces rotating on cylindrical grinding machines, and it can do this in a split second just after each grinding cycle, so it does not hamper mass production grinding processes. The proposed quick measurement system can capture the variations in surface finish in a set of repeated cylindrical grinding cycles without dressing. The possibility of accurate judging dressing time by using the quick measurement system in mass production grinding processes is shown experimentally.

DOI： 10.20965/ijat.2015.p0176

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圧粉磁心の各種特性に及ぼす加工条件の影響に関する研究査読

上野友之, 徳岡輝和, 大橋一仁, 塚本真也

砥粒加工学会誌 58 ( 12 ) 765 - 770 2014年12月

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8月

記述言語：英語掲載種別：研究論文（学術雑誌）

© (2014) Trans Tech Publications, Switzerland. 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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Studies on grinding conditions affecting the quality of soft magnetic powder cores 査読

Tomoyuki Ueno, Terukazu Tokuoka, Takao Nishioka, Kazuhito Ohashi, Shinya Tsukamoto

Advanced Materials Research 1017 27 - 32 2014年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Trans Tech Publications Ltd

© (2014) Trans Tech Publications, Switzerland. Soft magnetic powder cores are made by pressurizing and molding pure iron powder covered with insulation film. The material is used as a component of electro-magnetic converter parts essential for automobiles, home electric appliances and electronic equipment. The material permits downsizing and higher performance of such equipment. The recent severer requirements for performance and dimensional accuracy need a new processing technology that warrants the required level of both magnetic performance and surface quality of the material. However in general, processing - grinding - soft magnetic powder cores can give rise to degradation of magnetic performance and/or chipping or plucking of the ground surface due to the mechanical damage of the insulation film and/or loss of structural particles from the material due to the increase in grinding resistance. The authors performed basic studies for various grinding conditions and wheels that could possibly affect the quality of the material with a view to eliminating these problems. As a result, factors that affect the surface quality were identified, and a method that warrants a higher surface quality was proposed.

DOI： 10.4028/www.scientific.net/AMR.1017.27

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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8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Trans Tech Publications Ltd

© (2014) Trans Tech Publications, Switzerland. In order to establish a high performance grinding method of cemented carbide, the grinding force distribution on the working surface of the cup type electroplated diamond grinding wheel is experimentally analyzed with the grinding force variation of face grinding, which is carried out on the narrow workpiece. The grinding force distribution is obtained by the successive difference of the grinding force variation. The grinding state becomes steady as soon as beginning of the interference of grinding wheel in workpiece, because the edge profile of workpiece is formed as same as the envelope of the grinding wheel. Main conclusions obtained in this study are as follows. In the region of the front edge of the grinding wheel, relatively large grinding force occurs, then in the region of the rear edge of the grinding wheel, the grinding force becomes smaller. In the left right-side end of the wheel, the grinding forces are larger than the center of the wheel. It is made clear that the grinding force distribution shows the peak value near the outer part of the wheel, and the peak value is larger in the center part of the wheel, on the contrary, the peak width become broad in both the left and right-side end of the wheel.

DOI： 10.4028/www.scientific.net/AMR.1017.9

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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8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Trans Tech Publications Ltd

© (2014) Trans Tech Publications, Switzerland. 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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Machining characteristics in cylindrical blasting of micro grooves and performance of herring-bone bearing 査読

Taketo Fukushima, Kazuhito Ohashi, Masahiro Fujihara, Takashi Onishi, Shinya Tsukamoto

Advanced Materials Research 1017 205 - 211 2014年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Trans Tech Publications Ltd

© (2014) Trans Tech Publications, Switzerland. The micro patterning on a cylindrical surface is conventionally carried out by electrochemical machining, chemical etching, cutting and so on. However, there exists some problems in machining dimensional errors and tool lives. On the other hand, blasting is expected as one of micro fabrication methods and progresses to apply for machining of hard and brittle materials. The purpose of this study is to develop the micro blasting technique for patterning of micro herring-bone grooves on spindle surfaces of the fluid dynamic bearings. Then, machining characteristics in blasting of rotating workpieces are experimentally investigated, analyzing stock removals, burr heights and groove shapes. In addition, micro herring-bone grooves are patterned on spindle surfaces by blasting and the performance of herring-bone bearings are evaluated. The herring-bone bearings with micro grooves patterned on a spindle surface by blasting have enough performance, compared with conventional ones.

DOI： 10.4028/www.scientific.net/AMR.1017.205

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Deburring of Needle Point Using Slurry Flow with Cavitation 査読

Kazuhito Ohashi, Yuto Maeda, Nan Lu, Shinya Tsukamoto

Proceedings of the 15th International Conference on Precision Engineering 657 - 660 2014年7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- 査読

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

Proceedings of the 15th International Conference on Precision Engineering 157 - 160 2014年7月

Rapid on-machine measurement of surface finish in repeated cylindrical grinding cycles

K. Ohashi, K. Tan, T. Ashida, S. Tsukamoto

Conference Proceedings - 14th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2014 2 311 - 314 2014年6月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

The surface finish is one of important evaluation items of grinding results as well as the form and size accuracy or the surface quality in grinding. The surface finish of the ground surface has never been measured after each grinding cycle because the measurement of the surface finish needs relatively a long duration by existing surface roughness testers and applications of surface roughness tester in each grinding cycle would affect mass-production processes. We propose a rapid on-machine measurement technique of the surface finish, which can check the surface finish of cylindrical workpieces rotating on cylindrical grinding machines in a split second just after each grinding cycle, and the usefulness without hampering mass-production grinding processes is shown in this study.

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CFRPの研削特性に及ぼす加工雰囲気の影響(水溶性クーラントおよび液体窒素供給の効果) 査読

大橋一仁, 前野隼人, 藤原良平, 窪田真一郎, 吉川満雄, 塚本真也

日本機械学会論文集 C編(Web) 79 ( 808 ) 5068 - 5078 2013年12月

In-Process Monitoring of Machining State in Superfinishing 査読

Takashi ONISHI, Kazuhito OHASHI, Kohei HIGASHI, Shingo YAMASHITA, Takashiro IGUCHI, Shinya TSUKAMOTO

Proceedings of The 7th International Conference on Leading Edge Manufacturing in 21st Century 89 - 92 2013年11月

Investigation of Grinding Temperature of Carbon Fiber Reinforced Plastics 査読

Ryohei FUJIHARA, Kazuhito OHASHI, Mitsuo YOSHIKAWA, Shinichiro KUBOTA, Takashi ONISHI, Shinya TSUKAMOTO

Proceedings of The 7th International Conference on Leading Edge Manufacturing in 21st Century 103 - 106 2013年11月

Study on the restraint method of thermal deformation in the machine tools 査読

Kyosuke Umezu, Kazuhito Ohashi, Shinya Tsukamoto

Advanced Materials Research 797 603 - 608 2013年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

In the NC machine tools for automatic mass production processing lines, it is demanded that high stable machining accuracy is maintained for a long time. The main factor of deterioration in machining accuracy depends on the thermal deformation of machine tool, and the measures are one of the most important issues in the machine tool design. The thermal deformation is practically estimated by the temperature changing state of machine tools based on obtained data of their thermal deformation chracteristics. The estimation accuracy of thermal deformation depends on the thermometry points of machine tool greatly. This study describes an approach to the most suitable thermometry points in machine tool to determine the effective thermal deformation measures experimentally. As a result, the existence of points where the temperature of components changed with relation to thermal deformation very closely was confirmed. © (2013) Trans Tech Publications, Switzerland.

DOI： 10.4028/www.scientific.net/AMR.797.603

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Grinding system reducing the influence of thermal deformation of workpiece in cylindrical grinding 査読

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

Advanced Materials Research 797 609 - 612 2013年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：TRANS TECH PUBLICATIONS LTD

In cylindrical grinding, a sizing device is generally used to obtain the required dimension. However, the dimensional error can be caused by the thermal deformation of the workpiece even if grinding machine is controlled with the sizing device. To solve this problem, it is necessary to develop the grinding system that can consider the thermal deformation of the workpiece during grinding process. In this study, an advanced grinding system was developed, which can predict the net stock removal of ground workpiece immediately. The grinding experiment is carried out to verify the developed system. © (2013) Trans Tech Publications, Switzerland.

DOI： 10.4028/www.scientific.net/AMR.797.609

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論文 - 大橋 一仁

<大橋　一仁>

論文 - 大橋　一仁