研究一覧（2009年1月〜12月）
工作機械案内面のロストモーション特性補償による真円輪郭精度の向上
柴原豪紀，熊谷幹人*，幸田盛堂*，奥田孝一
*大阪機工?
日本機械学会論文集 Ｃ編，Vol.75，No.751，2009年，pp. 735-740 (2009)
This paper proposes a new compensation method for lost-motion characteristics in the NC machine tools employing slide-way. Lost-motion is a major disturbance to motion accuracy of the NC machine tools. In order to solve such problems, many compensation methods for lost-motion have been developed to improve them. However, these conventional methods have not been able to compensate some behaviors. In this paper, lost-motion characteristics are measured under various sliding speed and various approach distance. Table lift caused by dynamic pressure of lubricant oil is measured at the same conditions. From these results, experimental model as a function of decrement of lost-motion and table lift is proposed. A new compensation method based on experimental model is applied to circular motion. It is confirmed that a new compensation method improves circularity in optimum.
工具回転精度が金型加工面テクスチャに及ぼす影響
柴原豪紀，熊谷幹人*，幸田盛堂*，奥田孝一
*大阪機工?
砥粒加工学会誌，Vol.53，No.4，pp. 230-235 (2009)
本研究では，工作機械の運動誤差を考慮した加工面テクスチャのシミュレーション法を提案し，NC工作機械の工具回転精度が金型加工面テクスチャに及ぼす影響について検討した．提案したシミュレーション法により，ボールエンドミルを用いて加工した場合の金型加工面テクスチャを求め，実際の加工面と比較することで工具回転振れが金型加工面テクスチャに及ぼす影響について評価を行った．その結果，ボールエンドミルの一枚の切れ刃で生成される加工面では，工具回転振れが表面粗さに影響を及ぼさないこと，そして工具回転振れ量の大きな加工条件では，表面粗さが最小になる工具傾斜角が存在することを明らかにした．最後に金型加工で用いられる一般的な加工条件について，工具回転振れ量と表面粗さの関係をシミュレーションから求め，表面粗さを基準とした工具回転振れ量の数値目標を得た．
金型材の微小径エンドミル加工における切削現象
柴原豪紀，稲田泰仁，布引雅之，奥田孝一
日本機械学会論文集 Ｃ編，Vol.75，No.757，pp. 2387-2393 (2009)
This paper deals with cutting phenomena in micro end milling. Cutting experiment was conducted by small milling machine and micro end mill was used. Cutting torque was monitored during milling under various cutting conditions. Tool wear and surface roughness were measured in interval of constant cutting length and cutting force components were measured by dynamometer at that time. As the results, spindle speed at which tool wear was minimized existed in this experiment and feed rate hardly affected on tool wear. Surface roughness at bottom was deteriorated by interference between tip of tool edge and bottom of work, caused by deflection of tool.
りん青銅の超精密ダイヤモンド切削仕上面における結晶粒界段差の生成
奥田孝一
銅と銅合金，Vol.48，No.1，pp.266-271 (2009)
An ultra-precision cutting of a metal mold such as copper and copper alloy has to be carried out in a produce in large quantities of precision parts such as Fresnel lens. It is known that the grain boundary step is generated on the finished surface of aluminum alloy for a hard disc substrate and a polygon mirror due to the difference of elastic recovery property of each crystal grain. A step generated at grain boundary has been recognized as one of the major problems in the production of ultra-precision mold that the surface finish with a roughness of nano-meter order is required, since the step reaches to the magnitude of 20 ? 40 nm. Some studies on the grain boundary step in a diamond cutting of oxygen-free copper and large crystal copper have been reported. However, there are few studies on the step generated at grain boundary in the diamond cutting of practical copper alloy. In this study, in order to make clear the generation of the step at grain boundary in the ultra-precision cutting of a typical mold material, phosphor bronze, the ultra-precision cutting experiments are carried out and then the influence of the thrust force component and the heat treatment on the step at grain boundary is discussed. As a consequence, it was found that the thrust component of the cutting force and the feed rate condition greatly influence the magnitude of the step at grain boundary.
Study on Cutting of Micro Channel by End Mill with Small Diameter
Koichi Okuda, Tatsunori Tsuneyoshi, Wei Li, Hideki Shibahara
Key Engineering Materials, Vols. 407-408, 2009, pp.351-354
This paper describes the cutting characteristics and the shape error of groove when PMMA and PTFE are finished by the end mill with small diameter. Direct cutting experiments of micro channel by a miniature end mill were carried out in order to consider the possibilities of the fabrication of micro devices by machining. As the results, it was found that the surface roughness of 1 μm Rz or less was obtained and the width of channel became less than the tool diameter and the deflection of the end mill caused by the cutting force affected the shape error of the groove.
The Assistance Effect on MQL cutting performance in Nitrogen atmosphere
Hiroo Shizuka, Katsuhiko Sakai* and Yasuo Suzuki*
*Shizuoka University
Key Engineering Materials, Vol.407-408, 2009, pp.321-324
A large quantity of cutting fluid is discarded during the cutting operation, and there is increasing concern about the effect of this on human health and the natural environment. Therefore, a cutting method that uses no cutting fluid is being sought, but completely dry cutting would cause insufficient cooling and shorten tool life remarkably. In order to solve these problems, many MQL (Minimum quantities lubrication) process have been preceded and It produces good result of environmental issue. One of the most popular MQL technologies is Mist Cutting, which uses small quantity of cutting oil. That oil is effective for lubrication, too. But the quantity is so small that the cooling factor is not enough. In the meantime, we got result; Cutting process in the Nitrogen atmosphere causes decrease of Oxidation heat. But in this nitrogen cutting, the cutting temperatures get less while lubrication factor is defected. Since in this study, we tried Oil-nitrogen Hybrid Mist Cutting. We expect that complement rate of cooling and lubrication.
Bending Process of Silicon Wafer by Application of Laser
Koichi Okuda, Masayuki Nunobiki
Proceedings of the euspen International Conference, pp.467-470 (2009)
This paper deals with the bending process of the silicon wafer by CO2 laser irradiation. The bending of the silicon wafer was implemented in two procedures. The one is that the silicon wafer is locally heated by the laser in order to increase ductility and the bending load is added at the end of wafer. Another is that the wafer is bended by the use of thermal stress produced by the rapid heating-cooling cycle with the laser irradiation. It was found that the wafer was capable to be bended to the angle of 60 degree or more in the former procedure and the deformation with bending angle of about one degree occurred without the fracture in the later procedure.
Monitoring of cutting torque in micro end milling
Hideki Shibahara, Mikito Kumagai*, Seido Kohda*, Koichi Okuda
*OKK
Advanced Materials Research, Vols. 76-78, pp.514-519 (2009)
In this study, an approach by the feed rate control was applied for the improvement of form accuracy in the micro end milling process. In this approach called adaptive control constraint, the feed rate is controlled so that the cutting load is constantly kept and the deflection of tool does not occur. However, this method is not always effective in the micro cutting process that the influence of size effect cannot ignore. Therefore, the relationship between the cutting conditions and the form error in the micro end milling is experimentally investigated. The experiments on the machining of metal mold steel with the micro end mill are carried out and the formulation as function of the cutting conditions and the form error is identified by means of regression analysis. The performance of the feed rate control was validated based on experimental results. As the result, it was confirmed that the form accuracy was improved.
Study on Micro Cutting of LiNbO3 Wafer for Fabrication of SAW Device
Koichi Okuda, Tatsunori Tsuneyoshi*, Wei Li, Hideki Shibahara, Hiroo Shizuka and Masayuki Nunobiki
*Horiguchi Iron Factory Co.
Proc. of the 5th International Conference on Leading Edge Manufacturing in 21st Century, pp. 437-442 (2009)
This paper describes with the cutting properties of LiNbO3 wafer in the direct cutting of micro flow channel for the fabrication of micro pump device driven by surface acoustic wave (SAW) in μ-TAS. The surface integrity of the micro channel finished by micro end milling and the ultra-precision diamond cutting is evaluated under the variety of the cutting conditions and the crystal orientation of work material. The surface integrity extremely depends on the crystal orientation. The surface roughness in micro end milling is ranged from 3μm to 5μm Rz and is improved to approximately 1/10 in the diamond cutting.
Study on On-machine Deburring for Narrow Slits made by Laser Cutting
Masayuki Nunobiki, Koichi Okuda and Yosuke Kitsugi*
*Okamoto Steel Limited Partnership
Advances in Abrasive Technology XII pp.306-312 (2009)
This paper proposed an on-machine laser deburring method for narrow slits made by laser cutting. Burrs are generally unwanted materials which remain at the cutting edge after machining operations, such as grinding, drilling, milling or turning. A cost necessary to remove burrs becomes a significant portion of the machining costs. In laser cutting, dross removal was significant problem. It is difficult to prevent completely dross from adhering in laser cutting for stainless sheets. In laser cutting for adornments, it is necessary to remove the dross and to chamfer the cutting edges in order not to injure the hand. It is difficult to remove the dross and to chamfer the edges of a narrow slit by machine work or handwork. We irradiated the defocused laser beam to the slits again for these post-processing. To control the depth and width of the removal area, we examined the relationship between the removal area and the deburring conditions. It was clarified that the width and depth of removal area can be controlled by irradiation time and energy fluence.
Study on Dry Milling under a Nitrogen Atmosphere
Hiroo Shizuka
The 17th International Joint Seminar Between the Dong-A University & the University of Hyogo, pp.66-73(2009)
In dry cutting, where milling fluids are not used, the lack of cooling element causes a high cutting temperature, resulting in a significant decrease in tool life. Therefore, a technique of milling under a Nitrogen Atmosphere, in order to suppress the oxidation heat with a view to reduce the cutting temperature and to increase tool life, is suggested [1]. Nevertheless, the Nitrogen Cutting method has yet to achieve its full potential because of the occurrence of adhesion to tools [2]. In this context, this study reconsiders the method and conditions for cutting and successfully resolves the problem of adhesion. At the same time, with the practical application of the Nitrogen cutting in perspective, Nitrogen blow, which, with its simple apparatus, allows easy implementation in general-purpose machines, is examined, giving favorable results.
高硬度材の微小径エンドミル加工における工具摩耗特性
稲田泰仁，柴原豪紀，布引雅之，奥田孝一
日本機械学会関西学生会平成20年度卒業研究発表講演会，p.9-3 (2009)
極小径エンドミル加工における加工形状誤差に関する研究
柴原豪紀，河合悠樹，奥田孝一
2009年度精密工学会春季大会学術講演会講演論文集，pp.593-594 (2009)
レーザ切断部周辺に生じる熱塑性ひずみ解析
布引雅之，米岡功二，奥田孝一
2009年度精密工学会春季大会学術講演会講演論文集，pp. 907-908 (2009)
レジスト−メッキ構造を持つシリコン基板のレーザ曲げ加工
福西啓吾，布引雅之，静弘生，奥田孝一
精密工学会2009年度関西地方学術講演会講演論文集，pp.53-54 (2009)
ニオブ酸リチウムの微細溝加工に関する研究
静弘生，李偉，柴原豪紀，布引雅之，奥田孝一
2009年度砥粒加工学会学術講演会講演論文集，pp.335-336 (2009)
高硬度小径丸棒の旋削加工に関する研究
米田悦朗，静弘生，布引雅之，奥田孝一
2009年度精密工学会秋季大会学術講演会講演論文集，pp.41-42 (2009)
レーザによるチタン板の金型レス曲面加工に関する研究
蓬莱康佑，布引雅之，静弘生，奥田孝一
2009年度精密工学会秋季大会学術講演会講演論文集，pp.617-618 (2009)
行動履歴を活用し最適解を探索するActor-Critic型強化学習法−掃除ロボットの最短経路探索問題−
布引雅之，桃井直生，奥田孝一
2009 年度精密工学会秋季大会学術講演会講演論文集，pp.1001-1002 (2009)
使用者の嗜好を表す複数の副報酬関数に基づく強化学習法
柏本周平，布引雅之，奥田孝一，静弘生
2009 年度精密工学会秋季大会学術講演会講演論文集，pp. 1003-1004 (2009)
切削加工におけるバリの生成機構と抑制
奥田孝一
ツールエンジニア，Vol.50，No.6，pp.23-27，大河出版 (2009)
切削加工におけるバリの生成機構と抑制について
奥田孝一
素形材，Vol.50，No.10，pp.2-7，財団法人素形材センター (2009)
マグネシウム合金の切削加工技術と最近の動向 −ダイヤモンド工具による切削とレーザ加工面
奥田孝一
日本マグネシウム協会切削分科会，pp.13-43 (2009)
切削におけるバリ発生のメカニズムとエッジ品質の向上
奥田孝一
バリテクノロジーシンポジウム，(2009)
最近の機械加工技術あれこれ
奥田孝一
CASTクラブ第32回例会，(2009)
超精密・マイクロ加工
奥田孝一
医工連携人材育成セミナー，(2009)
バリ取り・エッジ仕上げ・表面仕上げ技術
奥田孝一
日本テクノセンターバリセミナーテキスト，pp.1-38 (2009)
マイクロナノマシニング −精密部品への応用と展開−
奥田孝一
マイクロナノ量産技術と応用デバイスに関する新事業開拓イノベーション人材育成関西地域ワークショップ，(2009)
超精密・マイクロ切削における切削現象
奥田孝一
精密工学会関西支部 第46回イブニングセミナー，(2009)
最近の機械加工技術の動向
奥田孝一
研究シーズ発表会（兵庫県立大学よくわかる出前セミナー），(2009)
超精密・マイクロ加工
奥田孝一
平成21年度ものづくり分野の人材育成・確保事業 高度機械加工技術アドバンストコース，(2009)