研究者詳細 - 大橋　一仁

Fundamental study on setting of diamond abrasive grains using electrostatic force for single-layered metal bond wheel 査読

Ohashi Kazuhito, Kawasuji Yusaku, Shinji Yoshifumi, Samejima Yoshitaka, Ogawa Soma, Tsukamoto Shinya

Advanced Materials Research 565 40 - 45 2012年9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

Single-layered metal bond diamond wheels are useful to high efficient grinding of difficult-to-grind materials because of the high gripping force of abrasive grains and the controllable grain density. In this paper, fundamental information are obtained for an application of electrostatic force to setting of diamond grains into pasted metal bond slurry layer on wheel surface, investigating experimentally jumping phenomenon of diamond grains in an electrostatic field between a electrode plate and metal bond slurry layer. The SD grains and the SDC grains coated with Ti are selected. SDC grains jump into a metal bond layer as quick as making an electrostatic field, however SD grains jump with short time lags. The setting rate of SDC grains is larger than that of SD grains, and setting position accuracy of SDC grain array is better than SD grain array. The possibility of setting abrasive grains into single-layered metal bond diamond wheel surface using electrostatic force is obtained and SDC grains are suitable to the proposed abrasive setting method. © (2012) Trans Tech Publications, Switzerland.

DOI： 10.4028/www.scientific.net/AMR.565.40

Application of cavitation aided abrasive machining to manufacture of micro air vents on injection molds 査読

N. Lu, K. Ohashi, A. Hirashima, A. Shimizu, S. Tsukamoto

Advanced Materials Research 565 597 - 602 2012年9月

担当区分：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

The purpose of this study is a practical application of the cavitation aided abrasive machining (CAAM). This study shows the machining effect of the precision abrasive machining on injection molds using the cavitation in a suction flow of slurry, which can easily finish to a fine surface by a simple apparatus. The cavitation occurred above the workpiece surface downstream of the restrictor tip because of the rapid decompression and then the abrasive grains in the water interfere with the workpiece surface by the cavitation impact. In this report, the possibility of application of the cavitation aided abrasive machining to the precision manufacturing of micro air vents on the rib of injection molds are generated by using masks of a certain thickness that are made on a special masking equipment, and the machining characteristics of micro air vents are investigated by analyzing the depth of micro grooves and the surface finish in machining of injection molds. When the depth of the micro grooves is approximately 1μm in the machining of 30 minutes, the manufacture of molding parts without burrs or residual voids is carried out by CAAM. © (2012) Trans Tech Publications, Switzerland.

DOI： 10.4028/www.scientific.net/AMR.565.597

大橋一仁, 曽我部英介, 魯楠

砥粒加工学会誌 56 ( 9 ) 626 - 631 2012年9月

Simulation analysis of temperature distribution and thermal deformation in a workpiece during cylindrical grinding 査読

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

10th International Conference on Progress of Machining Technology, ICPMT 2012 104 - 108 2012年9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）出版者・発行元：JAPAN SOC PRECISION ENGINEERING-JSPE

In cylindrical plunge grinding, thermal deformation of a workpiece can cause its dimensional error. Therefore, it is necessary to investigate thermal deformation process of the workpiece based on the temperature distribution during grinding. To calculate the thermal deformation of the workpiece, advanced new simulation method is proposed in this study. The temperature distribution is calculated with the grinding energy that can be estimated from the measured power of grinding wheel motor. The results of these simulations were compared to experimental results obtained with in-process measurement system of internal temperatures and thermal deformation of the workpiece. Good agreement was achieved between the simulated thermal deformation and the experimental one.

Grinding performance using alkaline electrolyzed and high-frequency reduced water 査読

Iba Shinichi, Ohashi Kazuhito, Honiden Kazuyuki, Kitajima Iwao, Shinya Tsukamoto

Advanced Materials Research 565 16 - 21 2012年9月

担当区分：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

The purpose of this study is to develop the environment-friendly coolant. Cylindrical plunge grinding tests are carried out using alkaline electrolyzed water, high-frequency reduced water and alkali-reduced water as coolant. Most effective coolant is brought out in comparison with surface roughness, grinding force and workpiece surface temperature. Moreover, elemental analyses and measurements of contact angle of treated water are carried out in order to clarify the effect on grinding performance. Furthermore, elemental analyses and observation of evaporation residues in treated water are also carried out. As a result, grinding performance using alkali-reduced water is better than that using alkaline electrolyzed water or high-frequency reduced water. © (2012) Trans Tech Publications, Switzerland.

DOI： 10.4028/www.scientific.net/AMR.565.16

Temperature distribution in a workpiece during cylindrical plunge grinding 査読

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

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

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

極薄板の平面研削による反り発生メカニズムの解明査読

大西孝, 湯川知厚, 大橋一仁, 坂倉守昭, 塚本真也

砥粒加工学会誌 56 ( 1 ) 29 - 33 2012年1月

Improvement of accuracy in internal grinding with shape modification on high aspect ratio wheel 査読

Takashi Onishi, Kazuhito Ohashi, Yuya Yamamoto, Moriaki Sakakura, Shinya Tsukamoto

Proceedings of the 6th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2011 2011年11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 an internal grinding, the stiffness of wheel spindle is not so high because of its small diameter. So the elastic deformation of wheel spindle becomes large. In this reason, the dimensional accuracy of workpiece worsens in internal grinding with a high aspect-ratio. To solve this problem, in this study, the shape of the grinding wheel is modified by the single crystal diamond tool. A grinding test with the formed wheel is carried out and the shape of the workpiece is measured. It is conformed that the shape error of the workpiece ground with the formed wheel is significantly improved.

Machining characteristics of cylindrical blasting and application to micro patterning 査読

E. Sogabe, K. Ohashi, N. Lu, M. Fujiwara, T. Onishi, S. Tsukamoto

Advanced Materials Research 325 570 - 575 2011年9月

記述言語：英語掲載種別：研究論文（学術雑誌）

Micro patterning on cylindrical surface, e.g. dynamic pressure bearings, is mainly carried out by chemical etching. However, there exist environmental problems in the waste etchant processing and safety ones in works using toxic chemical liquids. On the other hands, blasting is expected as one of micro patterning methods and comes into use for not only surface modification but also machining of hard and brittle materials. The purpose of this study is to develop the micro blasting technique for cylindrical parts. Therefore, machining characteristics in blasting of rotating workpieces are experimentally investigated, analyzing the stock removal and the surface roughness. In addition, the patterning of micro herringbone grooves are carried out on spindle surfaces based on the obtained characteristics. © (2011) Trans Tech Publications, Switzerland.

DOI： 10.4028/www.scientific.net/AMR.325.570

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 ) 418 - 423 2011年7月

カーボンの乾式研削における目づまり砥石のドレスレス切れ味回復法第2報:目づまり砥石の切れ味回復効果査読

大橋一仁, 大西孝, 住元洋輔, 藤田裕也, 塚本真也

砥粒加工学会誌 55 ( 5 ) 284 - 289 2011年5月

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

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：社団法人砥粒加工学会

円筒プランジ研削では，加工中に発生する研削熱の多くが工作物内部へ流入することにより工作物が熱膨張し，加工終了後の熱の流出に伴い工作物が収縮する．これらの工作物熱変形が，工作物の仕上げ寸法精度の低下を引き起こす大きな要因となっている．そのため，円筒プランジ研削において高い寸法精度を実現するためには，加工プロセスにおける工作物の熱変形挙動をリアルタイムで把握することが重要であり，熱変形に影響を及ぼす工作物全体の温度分布に注目する必要がある．そこで本研究では，円筒プランジ研削を対象に，工作物温度分布および工作物熱変形量を算出するシミュレーション解析モデルを提案し，加工プロセスにおける温度分布の時間変化および熱変形挙動を解明する．また，新たに開発した工作物温度分布の測定システムを使用して工作物温度分布のインプロセス測定を行うと同時に，工作物熱変形量をインプロセス測定することにより，研削熱が工作物に及ぼす影響を実験的に明らかにし，シミュレーション解析モデルの妥当性を示す．

DOI： 10.11420/jsat.55.161

カーボンの乾式研削における目づまり砥石のドレスレス切れ味回復法第1報:粘着テープを用いた切りくず除去法の提案と除去特性査読

大西孝, 大橋一仁, 藤田裕也, 住元洋輔, 塚本真也

砥粒加工学会誌 55 ( 2 ) 102 - 107 2011年2月

担当区分：責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：社団法人砥粒加工学会

カーボンの乾式研削においては，砥石の目づまりにより短時間で研削性能が低下するため，ドレッシングを頻繁に行う必要がある．しかし，ドレッシングではカーボンの切りくずのみならず，切れ味を失っていない砥粒も除去されるため，無用な砥石の消耗を招く．そこで，本研究においては，新たに粘着テープを目づまり状態の砥石表面に押し付け，はく離することで主に目づまりした切りくずを除去するドレスレス切れ味回復法を考案した．本報においては，切りくずの除去過程を明らかにするとともに，粘着テープの砥石に対する押付け力，はく離速度，転圧ローラの硬度が切りくず除去性能に与える影響を実験的に検討した．

DOI： 10.11420/jsat.55.102

Approaches to in-process measurement of surface roughness in cylindrical grinding 査読

T. Tachikawa, K. Ohashi, M. Tago, S. Tsukamoto

Advanced Materials Research 126-128 684 - 689 2010年9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）出版者・発行元：TRANS TECH PUBLICATIONS LTD

The purpose of this study is to develop an in-process of measurement technique of surface roughness using thermoelectric effect in cylindrical grinding. The electromotive force (EMF) generates depend on the surface roughness of workpiece and the variation of workpiece temperature when the sensor with thermocouple wires rubs on the workpiece surface in grinding process. In this paper, the in-process measurement technique of surface roughness in cylindrical plunge grinding is proposed, conceiving the cancellation of the EMF caused by the variation of workpiece temperature in the sensor output. Also a new type in-process sensor was developed for high accuracy to overcome the problem which was clarified in the cancellation method of the influence of workpiece temperature at a basic sensor © (2010) Trans Tech Publications, Switzerland.

DOI： 10.4028/www.scientific.net/AMR.126-128.684

Workpiece Temperature Distribution during Cylindrical Plunge Grinding 査読

M.Sakakura, T.Shinoda, S.Tsukamoto, K.Ohashi, I.Inasaki

Proceedings of 7th CIRP International Conference on Intelligent Computation in Manufacturing Engineering 2010年6月

Rapid On-machine Measurement of Surface Finish for Cylindrically Grinding Workpiece

K. Ohashi, M. Tago, T. Tachikawa, S. Tsukamoto

Proceedings of The 24th Annual ASPE Meeting 1 - 4 2009年10月

Improvement of grindactivity by dressless wheel treatment in dry grinding of carbon 査読

K. Ohashi, Y. Sumimoto, Y. Fujita, S. Tsukamoto

Advanced Materials Research 76-78 94 - 100 2009年9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）出版者・発行元：TRANS TECH PUBLICATIONS LTD

The grindactivity of wheel is remarkably lost by the loading of wheel surface in dry grinding of hard carbon parts. In this report, we propose the dressless wheel treatment, in which loading chips are removed with adhesive tape, and experimentally investigate its effect on recovery of grindactivity, analyzing the stock removal, the grinding current and the surface roughness in repeat of grinding cycle with treated and non-treated wheels. The removal and finishing performances of loaded wheel are recovered by the dressless wheel treatment.

DOI： 10.4028/www.scientific.net/AMR.76-78.94