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课题组 《机电产品开发与创新》2002,(5):45-48
1.技术概要机械制造技术在提高精度方面,从精密加工发展到超精密加工,其精度从微米级提高到亚微米级,乃至纳米级。就目前的加工技术而言,超精密加工技术是为了获得零件加工的尺寸精度、形状精度和表面粗糙度均优于亚微米级的综合技术措施,并向纳米级加工发展。纳米级加工是指零件加工的尺寸精度、形状精度和表面粗糙均为纳米级(<10nm,即<0.01μm)。超精密加工主要包括超精密切削(车、铣)、超精密磨削、超精密研磨(机械研磨、机械化学研磨、研抛、非接触式浮动研磨、弹性发射加工等)以及超精密特种加工(电子束、离子… 相似文献
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精密、超精密加工技术在提高机电产品的性能、质量和发展高新技术中起着至关重要的作用。并且随着科学技术的发展,机械加工所能达到的精度也有很大的提高。因此,精密、超精密加工的概念范围也在发生变化。现在国内外文献中谈论的精密、超精密加工,几乎都是指微米级(形状尺寸误差为3~0.3μm,表面粗糙度为 Ra 0.3~0.03μm)、亚微米级(精度为0.3~0.03μm,粗糙度为 Ra 0.03~0.005μm)和纳米级(误差小于0.03μm,粗糙度值小于 Ra 0.005μm)精度的加工。人们常把微米级精度加工称为精密加工,而亚微级和纳米级精度加工则称为超精密加工。为了… 相似文献
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1 前言 超精密加工是指亚微米级和纳米级精度的加工.超精密加工主要包括3个领域:(1)超精密切削加工,如金刚石刀具的超精密切削,各种镜面及激光核聚变系统和天体望远镜的大型抛物面镜的加工. 相似文献
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正纳米加工技术已成为国家科学技术发展水平的重要标志,国防战略发展和纳米级高精度、高质量、低损伤尖端产品的迫切需求,促进了纳米加工技术的快速发展。在纳米尺度,理解材料的变形、去除机理对于加工高质量的微纳器件至关重要,多晶材料作为制造微纳器件的主体,具有晶粒尺寸较小、大比例晶界和缺陷结构极少的特征,但目前对于多晶材料的去除机理仍缺乏研究基础和理论依据。纳米加工实验由于研究对象尺寸达到纳米量级,存在加工过程中材料的组织结构变化及缺陷演化难以动态观测和控制,可重复性差等问题,使之难以获得满意结果。从而科学计算和计算机仿真技术成为研究纳米加工 相似文献
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纳米科学和技术的新进展 总被引:1,自引:0,他引:1
介绍纳米科技几个主要方面的最新研究进展 :纳米级精度的测量 ;扫描隧道显微镜和原子力显微镜 ;超精密加工和原子级加工 ;纳米材料 ;微型机械和微型机电系统 ;微型机械的制造等 相似文献
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纳米技术及其在微型机械中的应用 总被引:1,自引:0,他引:1
纳米技术及微型机械被认为是21世纪的核心技术。文中介绍了纳米技术及微型机械的基本概念及纳米加工技术、纳米材料技术、纳米摩擦学等纳米技术在微型机械中的应用。 相似文献
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微型加速度计作为一种新型惯性传感器,它在体积、重量、成本、功耗、可靠性和寿命方面都具有传统加速计无可比拟的优势,3140型压阻式微硅加速度计是美国ICSensors公司的产品。文中介绍了它的结构设计和工作原理,并对其重要性能参数进行了测试和分析。 相似文献
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介绍了新发展的UltiMate^TM系列Nano液相色谱技术的原理,仪器配置及在生化分析中的应用实例。 相似文献
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Masahiko Yoshino Takashi Matsumura Noritsugu Umehara Yoichi Akagami Sivanandam Aravindan Takenori Ohno 《Wear》2006,260(3):274-286
This paper proposes a new concept of the ‘engineering surface’, which extends the conventional idea of a functional surface by combining it with micro/nano manufacturing technology. Characteristic features and possibilities of the engineering surface are discussed in detail. This paper reviews studies on micro/nano fabrication technologies for advanced materials and evaluation technology for surface function. New fabrication technologies, micro machining and nano forming, are introduced, which will be basic manufacturing processes of the engineering surface. Also, a new surface evaluation technique is introduced for the surface energy of the nano fabricated surface. Design of a new DNA micro array chip is introduced as an example of applications of the engineering surface. Controllability of surface property by nano fabrication is studied. 相似文献
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纳米技术正在创造一个新的人类环境。它具备有奇特而优异的性能。它的成果正在广泛应用于各个领域中.纳米科技在涂料中应用也是相当广泛的。经过纳米改性后的涂料具有新的特性与优势,促使涂料更新换代,为涂料成为真正意义的绿色环保产品开创了突破性的新纪元. 相似文献
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Budiono Doyoung Byun Vu dat Nyugen Jihoon Kim Han Seo Ko 《Journal of Mechanical Science and Technology》2008,22(12):2554-2562
We propose a novel micro/nano-scale nozzle structure, featuring an interfacial line between the hydrophilic and the hydrophobic
surfaces for a jetting system, such as an inkjet head or electrospray devices. This research will investigate the impact of
the interfacial line on flow instability and momentum augmentation as the liquid meniscus moves across the line. The research
methods used in this paper, in respect to micro-and nano-scale channels, are computational fluid dynamics (CFD) and non-equilibrium
molecular dynamics (MD), respectively. With the growing interest in micro/nano electromechanical systems (MEMS/NEMS), many
studies have been conducted to develop an advanced micro/nanofluidic system. However, until now, there have been few in-depth
studies on passive flow control in micro and nano nozzles using the hydrophilic and hydrophobic surface characteristics. In
this research, the sequential arrangement of hydrophilic and hydrophobic surfaces in the nozzle is presented along with an
investigation into how flow instability and momentum augmentation are going to be applied to an efficient micro/nano jetting
system. When a liquid meniscus arrives at the interfacial line between hydrophilic and hydrophobic surfaces, the meniscus
shape changes from concave to convex and the fluid motion near the wall stops until the concave shape is fully converted.
Because the momentum should be conserved, the lost momentum near the wall transfers to the center region, and therefore the
liquid at the center region is accelerated as it crosses the line. If we use this nozzle structure and the augmentation of
the momentum near the center, a tiny droplet can be easily generated.
This paper was recommended for publication in revised form by Associate Editor Haecheon Choi
Doyoung Byun received the B.S., M.S, and Ph.D. degrees in school of mechanical and aerospace engineering from the Korea Advanced Institute
of Science and Technology (KAIST), Taejon, Korea, in 1994, 1996, and 2000, respectively. From 2000 to 2002, he was in the
Korea Institute of Science and Technology Evaluation and Planning as a Senior Researcher. In 2003, he joined the faculty of
the School of Mechanical and Aerospace Engineering, Konkuk University, Seoul, Korea. His current research topics are development
of electrohydrodynamic inkjet head, microfluidic devices, and biomimetic robot systems. His research interests include microfluidics,
MEMS, and biomimetics. 相似文献