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Analysis of Machinable Structures and Their Wettability of Rotary Ultrasonic Texturing Method

Chinese Journal of Mechanical Engineering 2016年第6期29卷 1187-1192页

作者： XU Shaolin shimada keita MIZUTANI Masayoshi KURIYAGAWA Tsunemoto Division of Biomechanical Engineering Graduate School of Biomedical Engineering Tohoku University Department of Mechanical Systems Engineering Graduate School of Engineering Tohoku University

Tailored surface textures at the micro- or nanoscale dimensions are widely used to get required functional performances. Rotary ultrasonic texturing （RUT） technique has been proved to be capable of fabricating periodic micro- and nanostructures. In the present study, diamond tools with geometrically defined cutting edges were designed for fabricating different types of tailored surface textures using the RUT method. Surface generation mechanisms and machinable structures of the RUT process are analyzed and simulated with a 3D-CAD program. Textured surfaces generated by using a triangular pyramid cutting tip are constructed. Different textural patterns from several micrometers to several tens of micrometers with few burrs were successfully fabricated, which proved that tools with a proper two-rake-face design are capable of removing cutting chips efficiently along a sinusoidal cutting locus in the RUT process. Technical applications of the textured surfaces are also discussed. Wetting properties of textured aluminum surfaces were evaluated by combining the test of surface roughness features. The results show that the real surface area of the textured aluminum surfaces almost doubled by comparing with that of a flat surface, and anisotropic wetting properties were obtained due to the obvious directional textural features.

关键词： rotary ultrasonic texturing geometrically defined cutting edges surface generation mechanisms machinable structures,wetting properties

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Recent advances in ultrasonic-assisted machining for the fabrication of micro/nano-textured surfaces

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Frontiers of Mechanical Engineering 2017年第1期12卷 33-45页

作者： Shaolin XU Tsunemoto KURIYAGAWA keita shimada Masayoshi MIZUTANI Division of Biomechanical Engineering Graduate School of BiomedicalEngineering Tohoku University Sendai 980-8579 Japan Department of Mechanical Systems Engineering Graduate School ofEngineering Tohoku University Sendai 980-8579 Japan

In this paper, the state of art of ultrasonic- assisted machining technologies used for fabrication of micro/nano-textured surfaces is reviewed. Diamond machining is the most widely used method in industry for manufacturing precision parts. For fabrication of fine structures on surfaces, conventional diamond machining methods are competitive by considering the precision of structures, but have limitations at machinable structures and machining efficiency, which have been proved to be partly solved by the integration of ultrasonic vibration motion. In this paper, existing ultrasonic-assisted machin- ing methods for fabricating fine surface structures are reviewed and classified, and a rotary ultrasonic texturing （RUT） technology is mainly introduced by presenting the construction of vibration spindles, the texturing principles, and the applications of textured surfaces. Some new ideas and experimental results are presented. Finally, the challenges in using the RUT method to fabricate micro/ nano-textured surfaces are discussed with respect to texturing strategies, machinable structures, and tool wear.

关键词： ultrasonic-assisted machining textured sur-face micro/nano-structures functional performance

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Effects of Topography and Modified Layer by Plasma-Shot Treatment on High-Speed Steel

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Nanomanufacturing and Metrology 2020年第2期3卷 133-141页

作者： Yorihito Shibata Yusuke Sakairi keita shimada Masayoshi Mizutani Tsunemoto Kuriyagawa Graduate School of Engineering Tohoku University6-6-01AobaAramakiazaAobakuSendaishiMiyagiJapan Graduate School of Biomedical Engineering Tohoku University6-6-01AobaAramakiazaAobakuSendaishiMiyagiJapan

In this study,plasma shot(PS)treatment was applied to high-speed steel(HSS)surfaces using a titanium carbide electrode to confirm the effect of discharge current(Ip)on the formation of a single dimple and analyze a modified *** roughness of modified surfaces increased when Ip increased,and energy-dispersive X-ray spectrometry showed an increase in titanium atom density whenIp and electrode consumption volume(Ve)increased.A friction test confirmed that the modified surface's friction was reduced by discharge dimples under low-load *** hardness test confirmed that the hardness of the modified surface was-300-600 HV higher than that of an untreated HSS ***,it increased with an increase ***,application of PS treatment to the edge of surfaces on the workpiece caused shape *** deterioration size of the edge of the modified layer increased when Ip *** solve this issue,we propose a novel method named position-adjusted PS(PA-PS)***-PS treatment is used to adjust the end of the electrode in the order of tens of micrometers from the edge of the workpiece to avoid the deterioration of the edge *** Ip=21 A,PA-PS formed a modified layer without deteriorating the edge shape of the workpiece,thus confirming the PS characteristics applied to HSS ***,PA-PS treatment solved the shape deterioration of the edge on modified surfaces via PS treatment.

关键词： Plasma-shot treatment Electric discharge machining Surface modification High-speed steel-Tool wear Friction

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