共查询到20条相似文献,搜索用时 109 毫秒
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分别介绍了使用LIGA技术、微细电火花线切割技术(μ-WEDM)、微磨技术、组合式加工技术加工微阵列的最新方法.使用移动LIGA技术加工微针阵列、微细电火花技术加工复杂的三维微阵列电极、微磨技术加工微锥塔阵列、和UV-LIGA技术与微细电火花技术组合加工微阵列电极的工艺方法.主要论述各种方法加工高深宽比阵列结构的原理及其优缺点以及加工中的效率、成本等问题. 相似文献
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微小零件由于尺寸微小、结构复杂、加工精度高,所以对加工工艺的要求极高。微细切削是微细加工技术中效率较高、工件材料适用范围很广的加工方法,在微小零件的加工工艺研究中特别重要。主要阐述了微细切削加工设备及刀具系统配置、微细加工的特点及工艺要求、复杂曲面微细切削加工刀具和参数的选择、复杂曲面微细切削加工的实际加工等问题,通过采用合理的加工工艺和走刀路线,可以实现微小型零件的高精度加工,满足微小产品的需求。 相似文献
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随着产品小型化、微型化的发展趋势,微小型零件尤其是微小型结构件的需求越来越广泛,微小型复杂、异形、高强度、多尺度金属结构件对加工提出了更高要求,基于车铣复合加工的微细切削技术在加工微小型结构件方面有独特优势.首先对微小型结构件的工艺特征进行了总结和分析,指出微小型结构件加工机床的工艺特点,然后介绍了微小型车铣加工中心的结构布局和工艺能力,并对典型微小型结构件的加工工艺进行了试验研究,结果表明:基于微小型车铣加工中心,采用车、铣、钻、车铣复合工艺加工微小型结构件,能够一次装夹定位实现完整加工,提高了加工精度和加工效率,通过快速调整加工工艺,能够实现微小型结构件的柔性加工,是一种高效实用的加工方法. 相似文献
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微细电火花加工及其关键技术 总被引:3,自引:0,他引:3
综述了微细电火花加工的基本原理及最新研究进展。比较了LIGA技术与微细电火花加工的特点与应用。简要分析了微细电火花加工的关键技术:微细电极的在线制作、微进给装置、微小能量的脉冲电源、微小电极的运动轨迹规划、电极的损耗及补偿策略。展望了微细电火花加工在微三维结构加工中的应用前景。 相似文献
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微线段齿廓齿轮的弯曲强度分析 总被引:8,自引:1,他引:7
介绍了微线段齿轮的形成原理,建立了微线段齿轮有限元计算的力学模型,论证了计算中的奇点问题,并提出相应的解决方案,用正交试验法设计了一组算例并用有限元法进行计算,从而说明微线段齿轮的弯曲强度确实要优于渐开线齿轮。 相似文献
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Li Yong Guo Min Li Fang Zhou Zhaoying Department of Precision Instruments Mechanology Tsinghua University Beijing China 《机械工程学报(英文版)》2002,15(2):177-181
Micro electro discharge machining (micro EDM) is a feasible way to manufacture micro structures and has potential application in advanced industrial fields. For the realization of micro EDM, it is necessary to pay careful attention to its equipment design and the development of process techniques. The present status of research and development of micro EDM equipment and process techniques is overviewed. A micro electro discharge machine incorporated with an inchworm type of micro feed mechanism is introduced, and a micro electro discharge machine for drilling micro holes suitable to industrial use is also introduced. Some of the machining experiments carried out on the micro EDM prototypes are shown and the feasibility of the micro EDM technology to practical use is discussed. 相似文献
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Built-up edge (BUE) is generally known to cause surface finish problems in the micro milling process. The loose particles from the BUE may be deposited on the machined surface, causing surface roughness to increase. On the other hand, a stable BUE formation may protect the tool from rapid tool wear, which hinders the productivity of the micro milling process. Despite its common presence in practice, the influence of BUE on the process outputs of micro milling has not been studied in detail. This paper investigates the relationship between BUE formation and process outputs in micro milling of titanium alloy Ti6Al4V using an experimental approach. Micro end mills used in this study are fabricated to have a single straight edge using wire electrical discharge machining. An initial experimental effort was conducted to study the relationship between micro cutting tool geometry, surface roughness, and micro milling process forces and hence conditions to form stable BUE on the tool tip have been identified. The influence of micro milling process conditions on BUE size, and their combined effect on forces, surface roughness, and burr formation is investigated. Long-term micro milling experiment was performed to observe the protective effect of BUE on tool life. The results show that tailored micro cutting tools having stable BUE can be designed to machine titanium alloys with long tool life with acceptable surface quality. 相似文献
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Micro slot milling micro channels in a single pass vs two step upmilling has the benefit of higher productivity. This problem is approached by showing the theoretical benefits of more than two cutting edges. The acceptable feed per tooth and cutting depth at the maximum undeformed chip thickness for ductile-brittle transition and the benefit of upmilling versus downmilling and other parameters (tool wear, tool trajectory, tool deflection, air pressure/cutting oil) have been assessed by micro and macro-geometrical analyses versus surface finish/transparency, form error of the cross section shape in the micro scale (aspect ratio, tolerances, parallelism, flatness, straightness), chipping and productivity. Quantitative correlation between transparency and roughness is also proposed to estimate the acceptable amount of brittle mode. 相似文献