Faculty Profiles - TSUKIYAMA Yosuke

Papers - TSUKIYAMA Yosuke

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Frictional characteristics of clamp surfaces of aneurysm clips finished by laser processing Reviewed

Isami Nitta, Yosuke Tsukiyama, Satoshi Nomura, Noboru Takatsu

JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING 10 ( 2 ) JAMDSM0026 2016

Language：English Publishing type：Research paper (scientific journal) Publisher：JAPAN SOC MECHANICAL ENGINEERS

An aneurysm clip is a medical instrument that is used intraoperatively to clip a ruptured cerebral aneurysm and reduce the risk of rebleeding. To prevent the clips from slipping off the aneurysm neck, it is very important to maintain a constant clamp force. A high frictional coefficient of the clip blades will also help prevent slippage between the clip blades and the blood vessel. In this study, to raise the frictional coefficients of the clip blades, we used a laser processing machine to produce clamp surfaces of the aneurysm clips with micro-dimples or micro-grooves. The static and dynamic frictional characteristics of the clamp surfaces made in this way were examined. The grooved surfaces with a width of 30 mu m and a groove pitch of 40 mu m showed the highest frictional coefficient. However, the dimpled surfaces with a shallow depth of 1 mu m showed lower frictional coefficients than existing aneurysm clips.

DOI： 10.1299/jamdsm.2016jamdsm0026

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Nanoscale measurement of whole cylinder surface using a laser microscope with a wide field of view Reviewed

TSUKIYAMA Yosuke, FUKUSHIMA Naoyuki, NITTA Isami

Journal of the Japan Society for Precision Engineering 81 ( 7 ) 699 - 704 2015.7

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society for Precision Engineering

In a previous study, we developed a new method for observation of the whole cylindrical surface in a very short time,using a laser microscope with a wide field of view. When cylindrical specimens were rotated by a motor-driven rotary table, the focused laser light was scanned along a generatrix of the cylinder surface. Thus, the whole cylinder surface could be observed easily even over a very short time. As the obtained image was a developed view of the cylinder surface, it was easy to measure the distance between any two points on the cylindrical surface. In this study, we acquired interference images of the whole cylinder surface with the aid of a reference plane. As a result, fringe patterns over the whole cylinder surface could be obtained. From image processing of the fringe patterns, we calculated the nanoscale surface profile of the cylinder.

DOI： 10.2493/jjspe.81.699

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Relationship Between Friction Force and Real Contact Area Observed by Laser Microscope with Wide Field of View

Yosuke Tsukiyama, Naoya Fukuda, Takuto Masuda, Isami Nitta

ICMDT2015 (The 6th International Conference on Manufacturing, Machine Design and Tribology) 70 - 71 2015.4

Effect of laser micro texturing on the frictional properties of Ti material

Yusuke Aida, Masanori Honda, Tsuyoshi Kakiuchi, Yosuke Tsukiyama, Isami Nitta

ICMDT2015 (The 6th International Conference on Manufacturing, Machine Design and Tribology) 294 - 295 2015.4

Nanoscale Measurement of Whole Cylinder Surface using a Wide Field-of-View Laser Interferometer

Isami Nitta, Yosuke Tsukiyama, Shunsuke Sakuma

ICMDT2015 (The 6th International Conference on Manufacturing, Machine Design and Tribology) 426 - 427 2015.4

Evaluation of transformed layer of DLC coating after friction test using Atomic Force Microscopy (AFM) Reviewed

N. A. B. Masripan, Y. Tsukiyama, K. Ohara, N. Umehara, H. Kousaka, T. Tokoroyama, S. Inami, K. Zushi, M. Fujita

PROCEEDINGS OF MALAYSIAN INTERNATIONAL TRIBOLOGY CONFERENCE 2015 32 - 33 2015

Language：English Publishing type：Research paper (international conference proceedings) Publisher：MALAYSIAN TRIBOLOGY SOC-MYTRIBOS

Diamond-like carbons (DLC) with hardness of 47.1 GPa were coated on SUJ2 rollers, and their tribological properties were investigated after friction test under boundary lubrication conditions in an additive-free mineral-based oil at different testing oil temperatures of 24, 80 and 160 degrees C. From the results of the Raman analyses and Spectroscopy ellipsometry, we found that the structure changed of DLC at the topmost of sliding surface and their thickness will measured using AFM. It is found that the transformed layer increased with increases of testing oil temperature.

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Prologue to the Special Issue on "Up-and-Coming Tribologists"

TSUKIYAMA Yosuke

JOURNAL OF JAPANESE SOCIETY OF TRIBOLOGISTS 60 ( 2 ) 90 - 90 2015

Measurement of real contact area on thermal print head using a laser microscope with a wide field of view Reviewed

Isami Nitta, Yosuke Tsukiyama, Tsuyoshi Tsukada, Hirotoshi Terao

TRIBOLOGY INTERNATIONAL 79 162 - 173 2014.11

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCI LTD

In a dye-sublimation printer, a thermal print head presses and heats a dye-based ribbon to diffuse ink dyes to the desired positions into the receiving layer of paper. The print quality will deteriorate if the contact condition between the thermal print head and the paper is insufficient. Thus, it is necessary to analyze the contact condition for finer printing. Direct observation of the contact area with an optical microscope is effective to clarify the contact conditions of the thermal print head. However, conventional optical microscopes take too much time to observe the whole apparent contact area, because their fields of view are not sufficiently wide. Previously, we developed a laser microscope with a wide field of view and applied this laser microscope to observe the whole apparent contact area of rubber elements. In this study, we examined the contact conditions between the thermal print head and the paper. In general, when we observe the contact area of two solid surfaces, one is restricted to a transparent material such as a glass plate. Instead of the thermal print head, a glass head of the same shape as an existing thermal print head was pressed on the paper and observed through the glass head. This allowed us to clearly determine the contact situations of the interface and measure the contact widths and distributions of real contact area. In this method, it was confirmed that the contact width and the real contact area changed in accordance with the type of paper used, steps of the printing process, and density of color printing. (C) 2014 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.triboint.2014.06.005

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鉄道車両用レーザ三次元座標測定システムのデータ接続手法の開発 Reviewed

月山陽介, 菅野明宏, 新田勇, 大川永, 鈴木正毅, 久保田遼, 西脇正, 磯部光一

精密工学会誌 80 ( 7 ) 675 - 681 2014.7

Nanoscale measurement of whole cylinder surface with laser microscope with wide field of view

Isami Nitta, Yosuke Tsukiyama, Naoyuki Fukushima

ICPE2014 (15th International Conference on Precision Engineering) 830 - 835 2014.7

Evaluation of sealing characteristics of copper gasket using laser microscope with wide field of view Reviewed

NITTA Isami, MATSUZAKI Yoshio, TSUKIYAMA Yosuke, HORITA Motoshi, SAKAMOTO Shuichi

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 80 ( 814 ) DSM0173 - DSM0173 2014.6

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Mechanical Engineers

To quantitatively predict leakage rates through gasket/flange interface, it is important to observe contact conditions at seal surfaces because the leakage path consists of the non-contact portions between the flange and gasket surfaces. The contact surfaces of the flanges were finished by lathe turning. In this study, we observed real contact area on gasket surfaces using a laser microscope with a wide field of view. The observations indicated that the leakage paths on the gasket surfaces were in the radial direction perpendicular to a lathe-turned groove and the circumferential direction along the groove. As the closing loads increased, the leakage paths in the radial direction disappeared and only the leakage path in the circumferential direction remained. The critical contact pressure where the leakage paths in the radial direction disappear was determined from the observation of the contact surface of the gasket. Over the critical contact pressure, the leakage rates obtained from the experiments showed good agreement with the calculated values under the assumption of laminar flow along the turned groove. Under the critical contact pressure, the recalculated values considered the leakage paths in both the radial and circumferential directions approached the experimental values.

DOI： 10.1299/transjsme.2014dsm0173

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レーザスポット走査型干渉計の開発－小型レンズ金型の形状計測－ Reviewed

本合邦彦, 月山陽介, 鈴木天, 新田勇

精密工学会誌 80 ( 3 ) 302 - 307 2014.3

Evaluation of tribological properties of pick up roller measured using a laser microscope with a wide field of view Reviewed

Isami Nitta, Yosuke Tsukiyama, Tsuyoshi Tsukada, Hirotoshi Terao

TRIBOLOGY INTERNATIONAL 67 182 - 190 2013.11

Language：English Publishing type：Research paper (scientific journal) Publisher：ELSEVIER SCI LTD

Analysis of contact conditions between rubber rollers and printing paper is important for stable paper feeding operation. Direct observation of apparent contact area is necessary to understand contact conditions, such as distributions of real contact area and micro-slips. However, conventional optical microscopy takes too long to observe the whole apparent contact area because the field-of-view is too narrow. We developed a wide field-of-view laser microscope, and applied it to determine the distributions of real contact area of rubber rollers against glass plates. Critical torques at which micro-slips of the rubber rollers occurred were proportional to total real contact area. (C) 2013 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.triboint.2013.07.014

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Thorough Observation of Real Contact Area of Copper Gaskets Using a Laser Microscope With a Wide Field of View Reviewed

Isami Nitta, Yoshio Matsuzaki, Yosuke Tsukiyama, Motoshi Horita, Shuichi Sakamoto

JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME 135 ( 4 ) 041103-1 - 041103-7 2013.10

Language：English Publishing type：Research paper (scientific journal) Publisher：ASME

To quantitatively predict the leakage rates of static metal seals, it is important to observe the real contact area at seal surfaces because the leakage path consists of the noncontact portions between the flange and gasket surfaces. In a previous study, we observed the real contact situation using a thin polymer film 1 mu m in thickness. In the present study, we observed the real contact area on gasket surfaces using a laser microscope with a wide field of view. With this method, observation time over the whole gasket surface could be greatly reduced compared with conventional methods. The observations indicated that the leakage paths on the gasket surfaces were in the radial direction perpendicular to a lathe-turned groove and the circumferential direction along the groove. As the closing loads increased, the leakage paths in the radial direction disappeared and only the leakage path in the circumferential direction remained. When the closing loads increased further, the widths of the leakage paths at both the inside and outside on the gasket surface became narrower. The critical contact pressure where the leakage paths in the radial direction disappear was determined from the observation of the contact surface of the gasket. The leakage rates obtained from the experiments showed good agreement with the calculated values under the assumption of laminar flow along the turned groove over the critical contact pressure.

DOI： 10.1115/1.4024781

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Observation of the real contact area of carbon nanotube film

Yosuke Tsukiyama, Naoya Fukuda, Isami Nitta, Wataru Norimatsu, Michiko Kusunoki

World Tribology Congress 2013 2013.9

Observation of Spherical Surfaces using a Laser Microscope with Wide Field of View

Isami Nitta, Yosuke Tsukiyama, Takuya Watanabe, Naoyuki Fukushima

World Tribology Congress 2013 2013.9

Measurement of surface profile of precision molds using a newly developed scanning laser interferometer

Kunihiko Hongo, Hiraku Suzuki, Yosuke Tsukiyama, Isami Nitta

ICMDT2013 (The 5th International Conference on Manufacturing, Machine Design and Tribology) 207 2013.5

Contact Behavior of Vertically Aligned Carbon Nanotube film

Yosuke Tsukiyama, Naoya Fukuda, Isami Nitta, Wataru Norimatsu, Michiko Kusunoki, Noritsugu Umehara

ICMDT2013 (The 5th International Conference on Manufacturing, Machine Design and Tribology) 152 2013.5

Observation of Spherical Heart-Valve Prosthesis using a Laser Microscope with Wide Field of View

Isami Nitta, Yosuke Tsukiyama, Naoyuki Fukushima, Takuya Watanabe

ICMDT2013 (The 5th International Conference on Manufacturing, Machine Design and Tribology) 64 2013.5

Effect of texturing on friction properties of CNx coating layer under oil lubrication with imitation wear debris Reviewed

Takayuki Tokoroyama, Tomoyo Kaneko, Yosuke Tsukiyama, Noritsugu Umehara, Tetsuya Sato, Tadashi Suzuki

Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C 79 ( 806 ) 3895 - 3903 2013

Language：Japanese Publishing type：Research paper (scientific journal)

Frequent contacts between bearing balls or needles and its guide generate friction heat, and it is not demanded because oil viscosity becomes low, then oil film thickness decreases. In such case, direct contact between mating surfaces occurs in the real contact area. To prevent wear by direct contacts, high wear proof and low friction coefficient of hard carbon coating is demanded. However, in the case of wear particles which are generated from hard carbon coating, the particles become wear promotion elements of bearing surfaces. Therefore, a surface shape modification is important to eliminate wear particles from contact area. In this paper, we prepared CNx (Carbon Nitride) coating deposited on surface with texturing to reduce friction coefficient by wear particles which were lied between mating surfaces. Friction tests were carried out at mixed and boundary lubrication condition with VG100 oil. We applied glass beads as imitation wear particles. In the boundary lubrication condition, the CNx coated surface showed friction coefficient of 0.058 in only VG100 lubrication. On the other hand, the friction coefficient was approximately 0.12 without CNx coating in VG100 lubrication. In the case of friction test with glass beads, it was clarified that 40 μm width and 20 μm depth texturing with 32 lines showed lowest friction coefficient when the specimen slid against counter material. © 2013 The Japan Society of Mechanical Engineers.

DOI： 10.1299/kikaic.79.3895

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Papers - TSUKIYAMA Yosuke