江頭 快

J-GLOBALへ         更新日: 18/12/10 16:06
 
アバター
研究者氏名
江頭 快
 
エガシラ カイ
URL
http://www.cis.kit.jp/~egashira/index_J.html
所属
京都工芸繊維大学
部署
大学院工芸科学研究科 機械工学系
職名
准教授
学位
博士(工学)

研究キーワード

 
 

研究分野

 
 

論文

 
Kai Egashira, Akio Hayashi, Yu Hirai, Keishi Yamaguchi, Minoru Ota
Precision Engineering   54 338-343   2018年10月
© 2018 Elsevier Inc. Few studies have been reported on the drilling of microholes with a diameter of approximately 10 μm or less by electrochemical machining (ECM). The ECM of such holes was therefore attempted using ultrashort voltage pulses. Sta...
Kai Egashira, Takuya Furukawa, Keishi Yamaguchi, Minoru Ota
Precision Engineering   44 81-86   2016年4月
© 2016 Published by Elsevier Inc. A turn-milling machine, which is a device having two spindles that rotate a tool and workpiece, can be used to fabricate various shapes by cutting. However, little progress has been made in microcutting using a tu...
Hirotaka Miwa, Hirotaka Miwa, Takayoshi Katagi, Takayoshi Katagi, Minoru Ota, Keishi Yamaguchi, Kai Egashira, Toshikazu Nanbu
Materials Science Forum   874 133-138   2016年1月
© 2016 Trans Tech Publications, Switzerland. Recently, diamonds have been utilized gradually for sliding parts and wear-resistant parts because of their excellent properties. The shape of diamond applied to these parts is not only plane but also a...
Kai Egashira, Kenichi Kuriyama, Keishi Yamaguchi, Minoru Ota
Materials Science Forum   874 227-231   2016年1月
© 2016 Trans Tech Publications, Switzerland. There have been few reports on the drilling of microholes on rod end faces by cutting, which can be employed for fabricating micronozzles or microneedles. Such drilling was therefore attempted in the pr...
Keishi Yamaguchi, Minoru Ota, Kai Egashira, Hirotaka Miwa, Yoshiaki Onchi, Kenichi Tanada
Materials Science Forum   874 139-144   2016年1月
© 2016 Trans Tech Publications, Switzerland. Polycrystalline diamond (PCD) has excellent properties such as high hardness, high chemical inertness, high wear resistance and a low friction coefficient. Thus, it has been expected to be applied to us...
Keishi Yamaguchi, Yasuhiro Takada, Yuki Tsukuda, Minoru Ota, Kai Egashira, Tatsuro Morita
Procedia CIRP   42 662-667   2016年1月
Whirling Electrical Discharge Texturing (WEDT) was developed as a method of creating microstructures by a single-pulse discharge on the inner surface of a cylinder. In a previous study, a textured surface was successfully created on the inner surf...
Vitchuda Lertphokanont, Takayuki Sato, Masahiro Oi, Minoru Ota, Keishi Yamaguchi, Kai Egashira
Advanced Materials Research   1017 417-422   2014年1月
© (2014) Trans Tech Publications, Switzerland. A microstructured surface was created on a steel surface by whirling electrical discharge texturing (WEDT) since it was considered that the microstructures could act as lubricant reservoirs to assist ...
Keishi Yamaguchi, Ryo Yamazaki, Chuan Hai Yu, Minoru Ota, Kai Egashira, Yasunori Akita, Shoji Suzuki
Advanced Materials Research   1017 66-71   2014年1月
© (2014) Trans Tech Publications, Switzerland. Rapid Rotation Mirror-like surface Grinding (RRMG), in which combine Rapid Rotation Grinding (RRG) and Truncate Truing with Micro Dressing (TTMD) are combined, is a suitable method for mirror-like sur...
Vitchuda Lertphokanont, Masahiro Oi, Takayuki Sato, Minoru Ota, Kai Egashira, Keishi Yamaguchi, Masayoshi Yamada, Masayoshi Yamada, Yasuo Tomita
International Journal of Automation Technology   8 561-568   2014年1月
Discharge duration and pulse frequency are studied to determine the optimum conditions for creating a single crater. In addition, the relationships between pulse frequency and surface characteristics using Whirling Electrical Discharge Texturing (...
Kai Egashira, Kazuyuki Harada, Keishi Yamaguchi, Minoru Ota
Advanced Materials Research   1017 485-488   2014年1月
© (2014) Trans Tech Publications, Switzerland. The boring of microholes has been carried out using micro-turning tools. There is a limitation, however, on machinable shapes using the tools employed therein, with the fabrication of shapes with an o...
Kai Egashira, Ryokei Kumagai, Ryohei Okina, Keishi Yamaguchi, Minoru Ota
Precision Engineering   38 605-610   2014年1月
Drilling by grinding is useful for fabricating holes in hard and brittle materials with high dimensional accuracy and low machining cost. However, its application to microholes has been limited to those with a diameter on the submillimeter order. ...
Vitchuda Lertphokanont, Takayuki Sato, Minoru Ota, Keishi Yamaguchi, Kai Egashira
Advanced Materials Research   797 338-343   2013年10月
Whirling Electrical Discharge Texturing (WEDT) was developed to create microstructures. It was thought that textured surface with low surface roughness could reduce friction coefficient on the sliding parts. In this research, surface quality was s...
Kai Egashira, Yosuke Nomura, Yuichi Murozaki, Jimpei Fukui
Precision Engineering   37 248-254   2013年4月
The edge finishing and deburring of the back surfaces of micro-through holes, such as those with a diameter smaller than 1 mm, from the front surfaces by cutting are difficult and in some cases impossible with currently available tools. We have th...
Vitchuda Lertphokanont, Atsushi Nakayama, Minoru Ota, Kai Egashira, Keishi Yamaguchi, Naomi Kawada
International Journal of Automation Technology   7 121-127   2013年1月
This paper describes a highly efficient deburring technology that employs Whirling Electrical Discharge Machining (Whirling EDM). Whirling EDM was developed because burrs on the backside of smalldiameter holes, such as cross-drilled holes are not ...
A. Nakayama, V. Lertphokanon, M. Ota, K. Egashira, K. Yamaguchi, N. Kawada, S. Kouno
Key Engineering Materials   523-524 293-298   2012年12月
The authors developed Whirling Electrical Discharge Machining (Whirling EDM) [1] with the feedback circuit to control gap distance between tool electrode and workpiece. It was found that the probability of discharge was increased by feedback circu...
Takuya Furukawa, Yosuke Nomura, Kazuyuki Harada, Kai Egashira
Key Engineering Materials   523-524 76-80   2012年12月
The turning of straight micropins with a diameter smaller than 10 μm, which has not been reported so far, was carried out using micro turning tools made of cemented tungsten carbide. Tools of 50 μm diameter were fabricated by electrical discharge ...
Vitchuda Lertphokanont, Takayuki Sato, Minoru Ota, Keishi Yamaguchi, Kai Egashira
Advanced Materials Research   565 430-435   2012年11月
The authors developed Whirling Electrical Discharge Texturing (WEDT) in order to reduce friction coefficient of cylinder-shaped parts. In previous research, the authors verified fundamental characteristics of WEDT by observation of textured surfac...
Kai Egashira, Shigeyuki Hosono, Sho Takemoto, Yusuke Masao
Precision Engineering   35 547-553   2011年10月
We have developed cemented tungsten carbide (CTC) micro-cutting tools of 3 μm diameter by electrical discharge machining (EDM). Microdrilling and micromilling were carried out using the developed tools, and their cutting performance was investigat...
Kai Egashira, Mitsuo Iwata, Yosuke Nomura
CIRP Annals - Manufacturing Technology   60 81-84   2011年6月
Micro turning tools with outside diameters of 25-50 μm were fabricated using cemented tungsten carbide by electrical discharge machining and used for micro boring and micro face grooving. The new process used could improve the hole circularity dow...
Hiromitsu Ueno, Yuki Kono, Kai Egashira
Key Engineering Materials   447 448 238-241   2010年12月
The wire electrodischarge grinding (WEDG), which is one of the electrical discharge machining (EDM) methods, of submicron-diameter zinc micropins was attempted using a relaxation-type pulse generator. Tungsten wire of 30 μm diameter was employed a...
Kai Egashira, Yosuke Morita, Yasuki Hattori
Precision Engineering   34 139-144   2010年1月
We have carried out the electrical discharge machining (EDM) of submicron holes using ultrasmall-diameter electrodes. Two types of electrode were used: tungsten electrodes fabricated by the combination of wire electrodischarge grinding and electro...
江頭快,上島章,岩田光央
砥粒加工学会誌   53(4) 226-229   2009年
EDM of reverse-tapered microholes using bent electrodes
K. Egashira, A. Masuda, H. Tsuchiya and M. Miyazaki
International Journal of Electrical Machining   (13) 15–20   2008年
江頭快,藤田翔吾,細野誉章
砥粒加工学会誌   52(2) 105-108   2008年
Katsumi Mizutani, Kai Egashira, Tadashi Toukai, Jun Ogushi
JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing   49 539-544   2006年12月
The adhesion of a spider mite to a surface of a flat smooth plate is investigated as a model for micromachine parts to adhere to and move on such surfaces. The measurement of adhesive force is carried out under various conditions in which plate ma...
K. Egashira, A. Matsugasako, H. Tsuchiya and M. Miyazaki
Precision Engineering   30(4) 414-420   2006年10月
The possibility of electrical discharge machining (EDM) with ultralow discharge energy has been investigated. EDM using an RC discharge circuit was performed at low open-circuit voltages and a capacitance of approximately 30 pF. Workpieces were ul...
江頭快,谷口智哉,西村桂,土屋八郎,宮崎眞
砥粒加工学会誌   50(11) 649-653   2006年
Katsumi Mizutani, Kai Egashira, Tadashi Toukai, Jun Ogushi
Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C   71 2094-2099   2005年6月
Adhesion of a spider mite to a surface of a flat smooth plate is investigated as a model for micromachine parts to adhere to and move on such surfaces. Adhesive force is measured using a setup with a cantilever at the end of which the plate is mou...
Kai Egashira, Katsumi Mizutani
Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering   69 1449-1453   2003年1月
Ultra-small diameter cemented carbide ball end mills have been developed. Tools having a radius of ball nose of 10 μm have been manufactured by electrical discharge machining (EDM), because conventional methods cannot be readily applied to microto...
Kai Egashira, Katsumi Mizutani
Precision Engineering   26 263-268   2002年7月
The micro-drilling of monocrystalline silicon using a cutting tool was tested with the aim of fabricating three-dimensional and high aspect ratio micro-shapes. Micro-tools with a D-shaped cross-section and cutting edge radius of 0.5μm were fabrica...
K. Egashira, K. Mizutani, T. Nagao
CIRP Annals - Manufacturing Technology   51 339-342   2002年1月
Microholes with a diameter of 10 μm were drilled in glass by ultrasonic vibration cutting using a microtool fabricated by wire electrodischarge grinding. The workplace was vibrated in order to realize high-precision tool rotation. Cutting was perf...
Kai Egashira
Seimitsu Kogaku Kaishi/Journal of the Japan Society for Precision Engineering   67 157-161   2001年1月
Many reports on the cutting of hard and brittle materials such as single crystalline silicon and glass have been published so far, however, obtainable shapes have been limited because only turning tools or indenters have been used for cutting tool...
Kai Egashira, Takahisa Masuzawa
CIRP Annals - Manufacturing Technology   48 131-134   1999年1月
A new method for microultrasonic machining (MUSM) has been developed. In order to obtain high-precision tool rotation, the spindle mechanism employed in micro-EDM machines was introduced. Since the mechanism does not allow the vibration of tools, ...

講演・口頭発表等

 
Yu Hirai, Akio Hayashi, Kai Egashira, Keishi Yamaguchi, Minoru Ota
Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2017   2017年11月13日   
The drilling of microholes by electrochemical machining (ECM) using ultrashort voltage pulses was carried out. The tool electrode feed speed was automatically adjusted during drilling, based on the frequency of contact between the tool electrode a...
Eisuke Koya, Kenichi Kuriyama, Kai Egashira, Keishi Yamaguchi, Minoru Ota
Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2017   2017年11月13日   
The fabrication of nanoscale free-cutting brass micropins was performed using a monocrystalline diamond turning tool and a micro turning machine. The turning of micropins with an aspect ratio of larger than 3 was attempted at different approach an...
Atsushi Nakamura, Minoru Ota, Kai Egashira, Keishi Yamaguchi, Hirotaka Miwa, Nobuhide Nakamura
Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2017   2017年11月13日   
Polycrystalline Diamond (PCD) is expected to be applied to mechanical parts. Therefore, a high-efficiency and high-quality processing method is required. In this study, the authors developed a high-speed constantpressure grinding method, and the g...
Yuki Tsukuda, Minoru Ota, Kai Egashira, Keishi Yamaguchi, Yuki Nagatomi, Shunsuke Kakutani
Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2017   2017年11月13日   
The Micro Ball Forming (MBF) method was developed as a means of texturing a free form surface. In this study, a texturing method involving laser processing for the whole surface of a ball tool for MBF was devised. Firstly, the processing character...
K. Yamaguchi, T. Nakano, S. Kakutani, M. Ota, K. Egashira
Proceedings - 32nd ASPE Annual Meeting   2016年1月1日   

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