Presentations -
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各種工具皮膜上の凝着量の原子スケール計算
牧野 武彦，加田 静香，アジェイ・アンリタラジ
第67回塑性加工連合講演会 日本塑性加工学会
Event date： 2016.10
Language：Japanese Presentation type：Oral presentation (general)
Venue：埼玉（日本工業大学）
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Direct Measurement of Friction Force during Forming
Takehiko Makino. Yuya Yogo, Toshinari Michimoto
The 66th Japanese Joint Conference for the Technology of Plasticity The Japan Society for Technology of Plasticity
Event date： 2015.10
Language：Japanese Presentation type：Oral presentation (general)
Venue：Iwaki, Fukushima
The small deflection of a thin part fabricated at the other side of a flat tool surface is detected using laser reflection to decompose the normal and frictional forces. The locus of laser reflection on a detector showed both components.
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Takehiko Makino, Asaki Kobota
The 66th Japanese Joint Conference for the Technology of Plasticity The Japan Society for Technology of Plasticity
Event date： 2015.10
Language：Japanese Presentation type：Oral presentation (general)
Venue：Iwaki, Fukushima
The change in the friction character during forming strongly depends on adhesion processes. The process is captured by measuring a distribution of the contact potential difference (CPD) of the tool surface after an injection upsetting. The change in CPD of TiN-coated die surface is compared with that of non-coated die surface.
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Atomistic calculation of adhesion during forming International conference
Takehiko Makino, Penigalapaty Joseph Ajay Amrithraj, Masayuki Ishikawa and Shota Kohmura
XIII International Conference on Computational Plasticity (COMPLAS XIII) International Center for Numerical Methods in Engineering (CIMNE)
Event date： 2015.09
Language：English Presentation type：Oral presentation (general)
Venue：Barcelona, Spain
Hard coatings with smaller amount of adhesion during and after forming are required in this field. Interfacial phenomena between tool and material during forming are difficult to be observed by experiments. Therefore, an atomistic-calculation analysis of the interaction between heterogeneous atoms, derived from first-principles electronic-state calculations, has been utilized for the study of adhesion during forming. Before constructing the interaction between 15 ceramic coatings (tool) and aluminum (material), calculated bulk and surface properties of the ceramics are verified by the reported experimental lattice parameter, bulk modulus and work function. Using the derived inter-atomic potentials for the interfaces between the constituent atom in transition metal carbides or nitrides and the Al atom, a molecular dynamics calculation with the geometry of ironing-type forming (the inclined tool moves over the material of which the bottom is fixed) is carried out. The comparison between the speed of a tool and an Al atom identifies whether the Al atom adheres on the tool. The change in number and distribution of the adhered atoms during ironing are compared with all the 15 combinations.
The number of adhered atoms in the first layer on the tools increases and saturates immediately. The behavior is common in all combinations. The change in number of adhered atoms in the second layer onwards shows wide variations.
The distribution of adhered atoms is analyzed by using a radial distribution function. The increase of the number of adhered atoms in the second layer onwards (the growth of adhesion) depends on the structure of the first layer of adhered Al atoms. If the location of the first nearest neighbor atom of Al first layer is equal to the second nearest neighbor atom of the tool surface, then growth of adhesion occurs. -
Direct measurement of friction force during forming International conference
Takehiko Makino. Yuya Yogo, Toshinari Michimoto, Yohei Takamori
4th Asian Symposium on Materials Processing (ASMP 2015) 日本機械学会
Event date： 2015.08
Language：English Presentation type：Oral presentation (general)
Venue：Lombok, Indonesia
Information about distribution and change in friction during forming is required to construct a prediction model. The small deflection of a thin part fabricated at the other side of a flat tool surface is detected using laser reflection to decompose the normal and horizontal (frictional) forces. The locus of laser reflection on a detector showed both components. The values estimated from the locus were fairly close to the measured forces.
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マイクロ・メゾスケール押出し据込みにおける工具表面凝着過程の接触電位差測定
牧野武彦，道元俊成，森山慎平
第65回塑性加工連合講演会 日本塑性加工学会
Event date： 2014.10
Language：Japanese Presentation type：Oral presentation (general)
Venue：岡山
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成形中の工具面摩擦力直接測定法の開発
牧野武彦，道元俊成，余語祐弥
第65回塑性加工連合講演会 日本塑性加工学会
Event date： 2014.10
Language：Japanese Presentation type：Oral presentation (general)
Venue：岡山
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分子動力学による摩擦凝着挙動のモデル化
牧野武彦
日本塑性加工学会 ナノ・マイクロ加工分科会 第2回セミナー 「ナノ・マイクロ加工で活用されるシミュレーション」
Event date： 2013.12
Language：Japanese Presentation type：Oral presentation (invited, special)
Venue：首都大学東京 秋葉原サテライトキャンパス
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マイクロ・メゾ成形のトライボロジー
牧野武彦
日本塑性加工学会 プロセス・トライボロジー分科会 第139回研究会
Event date： 2013.11
Language：Japanese Presentation type：Oral presentation (invited, special)
Venue：福岡県八女郡 中島田鉄工所
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Process of adhesion on tool surface measured by contact potential difference
Event date： 2013.11
Language：Japanese Presentation type：Oral presentation (general)
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Analysis of frictional interface in micro/meso-scale injection upsetting
T. Makino, K. Kawai, M. Murase
Event date： 2013.11
Language：Japanese Presentation type：Oral presentation (general)
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Tensile test of cylindrical aluminium after micro/meso-scale severe deformation
Event date： 2012.11
Language：Japanese Presentation type：Oral presentation (general)
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Evaluation of adhesion on tool surface by contact potential difference
Event date： 2012.11
Language：Japanese Presentation type：Oral presentation (general)
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原子論的モデルによる工具被膜の耐凝着性評価手法
牧野武彦，ペニガラパティ・ジョセフ・アジェイ・アンリタラジ
第62回塑性加工連合講演会
Event date： 2011.10
Language：Japanese Presentation type：Oral presentation (general)
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Measurement of Mechanical Property of Material Formed in Micro/meso Scale International conference
Takehiko Makino, Hin Yen Fung, Yutaro Fukui
第４回ナノマイクロ成形技術に関するアジアワークショップ
Event date： 2011.10
Language：English Presentation type：Oral presentation (general)
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Ball Rotation in Micro-Dimple Forming Process International conference
A. Ishitani, T. Makino, K. Dohda, and J. Cao
6th ICOMM (International Conference on Micro Manufacturing)
Event date： 2011.03
Language：English Presentation type：Oral presentation (general)
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Analysis of Micro/Meso-Scale Forming considering Local Change in Friction Coefficient
牧野，堂田，呉
第61回塑性加工連合講演会
Event date： 2010.11
Language：English Presentation type：Symposium, workshop panel (public)
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母材変形による硬質被膜の破壊
堂田，牧野，胡
第61回塑性加工連合講演会
Event date： 2010.11
Language：Japanese Presentation type：Oral presentation (general)
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接触界面の摩擦力直接測定法の開発
堂田，牧野，高森
第61回塑性加工連合講演会
Event date： 2010.11
Language：Japanese Presentation type：Oral presentation (general)
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表面電位測定による焼付き発生の検出
牧野，堂田，菊地
第61回塑性加工連合講演会
Event date： 2010.11
Language：Japanese Presentation type：Oral presentation (general)
