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微挤压成形系统的设计与实现 总被引:1,自引:1,他引:1
针对微挤压成形工艺要求,设计开发了一种微挤压成形系统,该系统装置采用压电陶瓷为驱动器,以实现成形速度的精确控制;利用压簧-楔块机构实现自动进给,减少了人工操作步骤;通过计算机控制系统与传感器,实现对微挤压成形过程的实时控制及数据采集。在室温条件下,使用该成形系统对铅丝坯料进行微挤压实验研究,结果表明,成形装置受力形变对挤压结果产生的影响可以通过适当的预紧力得到改善,从而成形出轮廓清晰的微型齿轮,验证了该研究方案的可行性,为后续的微型金属零件成形研究提供技术依据。 相似文献
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开发能以每分钟100万转高速旋转、用于微机电系统(MEMS)的微引擎已成为当今微机械学中最具挑战性的课题之一。为了能细化和优化微引擎的设计,对动态测试技术的发展提出了新的要求。我们已经开发出一种光电子激光干涉显微镜(OELIM)测量技术,用于快速测量微机电系统的动态特性。本课题研究由静电梳驱动的微引擎的动态特性,微引擎由一个直径为64μm的驱动齿轮和一个直径为300μm的输出齿轮(负载齿轮)组成,致动器由一个同步信号驱动,该信号则由一个单独的波形发生器产生。 相似文献
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微型齿轮正反热挤压成形数值模拟 总被引:3,自引:3,他引:0
对微型齿轮正反热挤压成形进行三维刚塑性有限元模拟,利用三维有限元软件DEFORM模拟其成形过程中的金属流动充填规律,获得了变形中应力应变、温度、载荷特征,揭示了其微成形过程的变形机理.为生产实践提供理论依据. 相似文献
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德国不来梅市的Fraunhofer制造工艺与应用材料研究所的研究人员实验成功利用微型注射成形机精确地制造成功了像人体耳骨U形件之类的极小型精密制件。这种微型金属粉末注射成形技术,可用来生产钛金属和合金以及不锈钢等微型金属制件,也可以用来制造具有特殊磁性能和高强度的金属制件。他们在一系列的实验研究中,制造了300个每只质量只有5.4mg、厚度为0.3mm的微型制件。所用原料采用了细金属粉末与有机粘结剂的混合物,经过注射成形后再将粘结剂从所得制件中脱除。 相似文献
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精密微塑性成形系统的研制 总被引:11,自引:0,他引:11
随着微型零件尺寸的减小,对成形设备提出了更高要求,传统的塑性成形设备难以在小行程下实现载荷和位移的精确控制。针对微成形的特点研制了精密微塑性成形系统,设计了宏动/微动相结合的驱动系统,微动部分使用压电陶瓷作为驱动器,宏动部分采用精密丝杠旋钮来实现,借助数据采集系统进行数据的实时采集和处理,使用成形工艺控制器对微成形过程进行精确控制,该系统可以对模具进行加热以实现等温成形,由温度PID控制器控制。使用该精密微塑性性成形系统进行了微成形试验,所成形的微型齿轮零件质量良好。 相似文献
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微型机械电子系统是现代物理和高新技术互相融合的先进科技,是21世纪科学技术发展的前沿领域,本文介绍微型机械电子系统的概念,制造与应用及其需要深入研究的科研课题。 相似文献
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微操作机器人系统及其关键技术研究 总被引:3,自引:0,他引:3
微制作机器人技术是MEMS技术的一个重要分支,也是当前机器人研究领域的一个热点。本文分析了微操作机器人集成系统的特点,并针对微制作机器人系统研制中涉及的一些关键技术,如驱动、定位、检测和控制等技术进行了论述。 相似文献
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Zr基非晶合金微塑性成形工艺研究 总被引:1,自引:0,他引:1
研究了Zr41.2Ti13.8Cu12.5Ni10Be22.5块体非晶合金(Vit.1)在370~430℃区域内等温压缩变形行为,获得其高温粘性流变规律。利用透射电镜分析Vit.1在370℃时应变软化及420℃时应变强化现象。根据所确定的高温变形工艺参数,使用快速加热精密微塑性成形系统进行了Vit.1微型齿轮成形试验,研究不同温度及载荷下的齿轮成形工艺。利用扫描电镜、原子力显微镜和显微硬度计对成形件的表面形貌和性能分析结果表明,在温度395℃及载荷350N条件下成形出的非晶合金微型齿轮性能均匀表面光洁度好,利用此微成形工艺可以获得质量良好的微型零件。 相似文献
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采用自行研制的微成形系统进行热压缩实验,分别研究成形温度、成形时间和冲头速度等对尺寸为d1 mm×1.5 mm的Zr41.2Ti13.8Cu12.5Ni10Be22.5块体非晶合金(Vit.1)在过冷液相区微塑性成形性能的影响规律。进一步研究了不同坯料尺寸对Vit.1块体非晶合金在过冷液相区超塑性成形性能的影响程度,结果表明流动应力随坯料尺寸的减小而降低。在此基础上,利用闭式模锻方法成形了分度圆直径为d1 mm的微型齿轮,采用SEM观察成形件的表面形貌,结果表明采用微成形方法可以获得尺寸精度较高的Vit.1块体非晶合金微型齿轮。 相似文献
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In this paper, we describe the reliability evaluation for MEMS devices, especially designed tbr DVD(Digital Video Disk) application.
These MEMS devices are fabricated as a mirror plane (shutter plane) used in DVD data picking up. This micromachined annular
shutter mirror (ASM) acts as an adjusting means of the numerical aperture. The electrostatic force can drive the upper plane
up and down for focusing or defocusing of incident laser beam to the selected recording plane. So we need to evaluate the
micromechanical properties of thin film structural materials to ensure the reliability of those MEMS devices. For those, we
perfl)rm the fatigue tests onto the devices in the conditions of much accelerated than those of normal driving. The applied
electrostatic force can induce the change of the thin film properties, and those are observed by direct and indirect methods
(XRD and electrical system). And then, we compare the fatigue effects with electrical, optical data from the intentionally-fatigue-applied
specimen and as-fabricated one under accelerated conditions. Consequently, we can estimate the structural reliability and
will provide the effective suggestion data for the fabrication of stable mirror material before commercialization. 相似文献
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Sungmin Park Sang-Hee Yoon Hyoungjae Kim Haedo Jeong 《Journal of Materials Processing Technology》2012,212(12):2635-2641
Micropatterned thin films when planarized using chemical mechanical polishing (CMP) accompany several inherent problems, especially dishing defects. The deteriorations in surface planarity limit the accuracy and flexibility of next fabrication steps, thus accounting for a major portion of yield losses in the mass production of microelectronic components. A hybrid polysilicon (poly-Si) planarization using a protective dioxide (SiO2) film and two slurries having diametrically opposite poly-Si-to-SiO2 selectivity is developed to suppress dishing defects in the CMP of patterned poly-Si films. A 30 nm-thick protective SiO2 film is deposited on a patterned poly-Si film to protect recessed areas on the uneven poly-Si film; the SiO2-protected poly-Si film is planarized with the first slurry having low material selectivity to selectively remove the protective SiO2 film placed on protruding areas while effectively remaining it located on recessed areas; the primarily planarized poly-Si film is polished again with the second slurry having high material selectivity to minimize the amount of dishing defects. For diverse poly-Si layers having different pattern widths of 5–90 μm, the dishing amount is measured less than 23.1 nm after the hybrid poly-Si planarization, and noticeably the dishing amount is insensitive to the pattern width. This shows that our hybrid poly-Si planarization can improve the planarity of each poly-Si film in the fabrication of multi-level (or three-dimensional (3D)) microdevices. The dependence of the material removal rate of poly-Si films on critical slurry parameters such as slurry pH and abrasive concentration is also intensively discussed. 相似文献
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Peter Fonda Kazuo Nakamoto Amir Heidari Hsueh-An Yang David A. Horsley Liwei Lin Kazuo Yamazaki 《CIRP Annals》2013,62(1):183-186
For productive manufacturing of an accurate small-scale wine-glass gyroscope, a hybrid fabrication process consisting of either electric discharge machining, chemical etching, or micro-mechanical milling have been proposed. A comparison of silicon cavity fabrication processes has been conducted in terms of productivity, quality and geometrical accuracy, aiming at the use of the cavity as a mold for creating a thin wall diamond hemisphere, which is the main component of a wine-glass gyroscope. The results have shown that the EDM process, combined with chemical etching, can yield the highest productivity but with limited shape accuracy. The use of mechanical micro-milling, while less productive than EDM and etching, produces a superior quality and geometric accuracy. 相似文献
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通过对铝镁合金材料的焊接特性的分析,总结出内外两面成形且不加管道内衬的施工工艺,以此来提高铝镁合金管道的焊接一次合格率。 相似文献