共查询到20条相似文献,搜索用时 31 毫秒
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车铣复合加工技术能实现以铣代车或磨高速切削回转体零件。基于此技术的微细切削无论是在生产率还是在加工表面质量上,较其它加工技术而言,更适合于微细轴类零件和具有复杂型面的微小型零件的加工。通过微细车铣切削微细丝杠试验,从切削用量和加工质量及刀具磨损方面研究了车铣复合加工技术在解决微细丝杠加工中的应用。结果表明,基于车铣复合加工技术能够实现微细丝杠的高速切削。该技术非常适合于微细丝杠零件加工。 相似文献
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微细超声复合电加工技术与应用 总被引:1,自引:0,他引:1
为进行微器件及零件表面微结构的精微制作,提出微细超声复合电加工技术。构建、完善加工参数可较大范围调节的微细超声复合电加工系统,进行复合电加工机理研究;用组合放电微细加工方法,制作出可满足试验及实际加工要求的多种截面、尺寸的微细工具电极;进行多参数超声复合电加工试验研究,结果表明微细超声复合电加工技术具有加工效率高、精度好及成本低的技术优势。分析储油微结构对摩擦副表面摩擦学特性的影响规律,用超声复合电加工技术制作摩擦副表面储油微结构,摩擦学试验证明储油微结构可使摩擦副表面摩擦因数减小,磨损量降低。 相似文献
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2精密型孔加工实现精密和微细加工,除了制作合格的电极、具备相应的电加工机床和脉冲电源外,熟练地掌握合理的加工工艺是重要关键。 相似文献
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大长径比微细轴的车削工艺研究 总被引:3,自引:0,他引:3
微纳米级器件的加工是MEMS系统的开发、应用的关键技术之一。通过切削试验,设计出能加工最小直 径为7 μm的微细轴的金刚石车刀,其主要参数为:主偏角Kr=93°,副偏角Kr'=300°前角γ0=0°,后角α0=5°。 然后以加工直径20 μm的轴为例,分析了进给量、背吃刀量以及主轴转速对微细轴成形和表面粗糙度的影响。研 究结果表明,在微细轴的加工中,切削用量不仅对工作表面质量产生影响,而且关系到是否能够车削成形。在可 成形范围内,进给量与表面粗糙度值成正比,具有显著的影响;背吃刀量、主轴转速对表面粗糙度的影响较小。 最后试制了不同加工参数条件下的极限实例产品。 相似文献
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分析了超微细切削加工的机理、特点及技术难点 ,并对最小切削厚度与刀具刃口圆弧半径的关系进行了量化分析。讨论了切削过程中的微振动、刀具的磨损和崩刃、材料的微量切削加工性、机床的动特性、加工环境的稳定性等因素对超微细切削过程的影响 ,并提出了解决措施。 相似文献
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Research on improvement of machining accuracy of micro-rods with electrostatic induction feeding ECM
Micro-rods were machined by electrochemical machining using the electrostatic induction feeding method, with which ultra-short current pulse duration of several tens of ns can easily be obtained. A tungsten plate and stainless steel (SUS304) rod were used as the tool electrode and workpiece, respectively. To improve the machining accuracy, the machining characteristics when the workpiece is fed in the axial and radial directions were investigated using NaCl aqueous solution as the electrolyte. When fed in the axial direction, the machinable length of the micro-rods was found to peak at the optimum feed speed because of the influence of pitting corrosion and collision between electrodes. When the workpiece was fed in the radial direction, the influence of pitting corrosion decreased, however, the micro-rod was shortened with increasing feed distance in the radial direction because of the stray current flowing through the end of the micro-rod. The simulation results of the material removal process agreed qualitatively with experimental results. Next, machining characteristics were compared between the electrolytes, NaCl and NaNO3 aqueous solutions, by feeding the workpiece in the axial direction. It was found that the influence of pitting corrosion was eliminated with the NaNO3 aqueous solution, and there was no machinable length limitation with suitable feed speeds. In addition, the taper angle and gap width were smaller with the NaNO3 aqueous solution, compared with those of the NaCl aqueous solution. Stainless steel micro-rods of 100 μm in diameter with a high aspect ratio of 20 were fabricated with the NaNO3 aqueous solution. According to the preliminary research results, the machinable minimum diameter of the micro-rods was investigated and micro-rods with an average diameter of 9 μm and length of 78 μm were machined successfully. 相似文献
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A micro rod machining method which can switch between electrical discharge machining (EDM) and electrochemical machining (ECM) by attaching/detaching a diode to/from a bipolar pulse generator in parallel to the working gap was newly developed using a wire electrode made of tungsten. The problem of the wire electrode wear was eliminated by the use of the wire electrochemical turning (WECT) method in which the tungsten wire electrode is continuously running. The ultra-short bipolar pulse current was generated by the electrostatic induction feeding method where a pulse voltage is coupled to the working gap through a feeding capacitance. The machining characteristics of three types of wire guide; disk-shaped WC guide, laminated wire guide and cylindrical acrylic guide, were studied. The experimental results showed that the cylindrical acrylic guide has the best machining characteristics without the influence of guide wear and with less stray current flowing through the working gap. Using the cylindrical acrylic guide, the influences of the feeding capacitance C1, and the total amplitude of the pulse voltage on the machining characteristics were studied. Finally, a stainless steel SUS 304 micro-rod with a high aspect ratio of 14 was fabricated efficiently by using the EDM and ECM modes for rough and finish machining in sequence with the same setup, pulse generator, and neutral electrolyte. 相似文献
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数控电火花线切割加工工艺研究 总被引:1,自引:0,他引:1
通过分析数控电火花线切割加工的原理,介绍了数控电火花线切割加工的特点及其应用,对数控电火花线切割加工工艺进行了研究和探讨,并对数控电火花线切割中常见的问题,提出了处理意见。 相似文献
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Fengbiao Wang Yongqing Wang 《The International Journal of Advanced Manufacturing Technology》2018,99(9-12):2271-2281
This paper presents the first comprehensive investigation that aluminum honeycomb has inevitable machining defect in milling process, such as deformation, burr, and collapse. Ice fixation method was used to clamp workpieces, and inner-injection liquid nitrogen was employed for a series of cryogenic milling machining. In the machining process, the main machining parameters including in honeycomb orientation, milling width, cutting depth, cutting speed, and feed were executed experimental research. Meanwhile, the machining parameter optimization, range, and significant analysis were adopted to analyze the influence of machining parameters on the machining surface quality, as well as the optimal parameter combination and milling machining surface quality were predicted and verified. The results show that the ice fixation aluminum honeycomb method with cryogenic milling is much advanced than that of conventional ones, and many machining defects are effectively restrained. At the same time, the influence of machining parameters on machining qualities in descending order is cutting depth, cutting speed, honeycomb orientation, feed, and milling width. The minimum roughness value (Ra?=?0.356 μm) of the predicted machining surface is similar to the actual machining result (Ra?=?0.362 μm). It verifies the feasibility of the optimization method. Furthermore, it is proved that the ice fixation + liquid nitrogen cooling method has a positive effect on the high milling quality and implement efficiency for aluminum honeycomb and other difficult-to-machine materials. 相似文献
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B. B. Pradhan M. Masanta B. R. Sarkar B. Bhattacharyya 《The International Journal of Advanced Manufacturing Technology》2009,41(11-12):1094-1106
Being a difficult-to-cut material, titanium alloy suffers poor machinability for most cutting processes, especially the drilling of micro-holes using traditional machining methods. Although electrical discharge machining (EDM) is suitable for machining titanium alloys, selection of machining parameters for higher machining rate and accuracy is a challenging task in machining micro-holes. The present research attempts to optimize micro-EDM process parameters for machining Ti-6Al-4V super alloy. To verify the optimal micro-EDM process parameters settings, metal removal rate (MRR), tool-wear rate (TWR), over cut (OC) and taper were chosen as observed performance criteria. In addition, four independent parameters such as peak current, pulse-on time, flushing pressure, and duty ratio were adopted for evaluation by the Taguchi method. From the ANOVA and S/N ratio graph, the significant process parameters and the optimal combination level of machining parameters were obtained. It is seen that machining performances are affected mostly by the peak current and pulse-on time during micro-electro-discharge machining of titanium alloy. Mathematical models have been developed to establish the relationship between various significant process parameters and micro-EDM performance criteria. In-depth studies have also been made to examine the influence of various process parameters on the white layer and surface topography through SEM micrographs of machined micro-hole. 相似文献