共查询到19条相似文献,搜索用时 129 毫秒
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精密模具的大面积镜面加工技术 总被引:1,自引:1,他引:0
介绍了精密模具电火花镜面加工的意义及国内外电火花镜面加工的研究概况。在讨论电火花镜面加工机理的基础上 ,对镜面加工的工艺参数、加工设备、影响因素等问题进行了分析 ,并对精密模具电火花镜面加工的主要关键技术进行了讨论 ,包括镜面加工脉冲电源的设计、镜面加工电火花控制系统、电极和工件材料的影响因素、混粉工作液加工工艺等 相似文献
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混粉电火花镜面加工技术概述 总被引:1,自引:0,他引:1
简要介绍了混粉电火花加工技术(PMEDM)的发展概况,详细论述了混粉电火花镜面加工的机理及加工效果的影响因素,并指出了混粉电火花加工中存在的问题,最后展望了混粉电火花镜面加工技术的发展趋势。 相似文献
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根据航空发动机零件加工的需要及电火花加工的特点,研制了工作台旋转的专用电火花机床,初步解决了发动机零件的加工问题。 相似文献
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Near dry electrical discharge machining 总被引:4,自引:0,他引:4
C.C. Kao Jia Tao Albert J. Shih 《International Journal of Machine Tools and Manufacture》2007,47(15):2273-2281
This study investigates the near dry electrical discharge machining (EDM) process. Near dry EDM uses liquid–gas mixture as the two phase dielectric fluid and has the benefit to tailor the concentration of liquid and properties of dielectric medium to meet desired performance targets. A dispenser for minimum quantity lubrication (MQL) is utilized to supply a minute amount of liquid droplets at a controlled rate to the gap between the workpiece and electrode. Wire EDM cutting and EDM drilling are investigated under the wet, dry, and near dry conditions. The mixture of water and air is the dielectric fluid used for near dry EDM in this study. Near dry EDM shows advantages over the dry EDM in higher material removal rate (MRR), sharper cutting edge, and less debris deposition. Compared to wet EDM, near dry EDM has higher material removal rate at low discharge energy and generates a smaller gap distance. However, near dry EDM places a higher thermal load on the electrode, which leads to wire breakage in wire EDM and increases electrode wear in EDM drilling. A mathematical model, assuming that the gap distance consists of the discharge distance and material removal depth, was developed to quantitatively correlate the water–air mixture's dielectric strength and viscosity to the gap distance. 相似文献
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综述了日本在放电加工领域的最新研究动态,包括成形放电加工、微细放电加工和线切割放电加工三部分内容。在成形放电加工方面,主要介绍一项新技术——气中放电高速三维空腔铣的原理、实验装置及加工效果;在微细放电加工方面,主要介绍一种新近开发的可同时加工微细轴和微孔的自动微孔加工装置和目前已加工出的微细轴的最小尺寸;在线切割放电加工方面,主要介绍了提高圆角加工精度的新方法、提高放电位置可控性的新方法和新的硅锭切片方法。 相似文献
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针对放电诱导烧蚀加工在高效加工的同时易在工件表面产生巨大烧蚀坑的问题,提出了电火花诱导烧蚀磨削修整复合加工方法。对钛合金TC4进行了电火花加工、烧蚀加工、诱导烧蚀磨削修整复合加工的对比实验,研究机械磨削作用对烧蚀性能的影响。在钛合金烧蚀加工实验过程中,用复合机械磨头进行修整能显著提高加工效率,达到1107 mm3/min,是同等条件下电火花加工的6.77倍、烧蚀加工的1.27倍。由于存在机械磨削修整作用,可在线去除烧蚀产物,露出基体材料,工件表面粗糙度优于烧蚀加工,甚至优于同等电参数下的电火花加工,达到了在获得高效加工的同时提升表面质量的目的。 相似文献
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针对SiCp/Al的加工,提出一种超声振动磨削放电复合加工的方法.从加工效率、加工稳定性及表面质量等方面与电火花加工进行了对比试验研究。分析了两种加工方法的脉冲宽度和峰值电流对加工速度和表面粗糙度的影响,结果表明:电火花加工的表面粗糙度平均值为尺04.5μm,超声振动磨削放电复合加工的表面粗糙度平均值为Ra2μm:超声振动磨削放电复合加工的稳定性比电火花加工好,但加工速度较低。通过扫描电镜对两种加工方法下零件表面形貌和重熔层进行了观测,对试件表面进行了X射线衍射分析,表明采用超声振动磨削放电复合加工SiCp/Al复合材料可获得较好的表面质量。 相似文献
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以孔形型腔和手机模具型腔为例,探讨两种情形下电极的设计以及根据电极的实际加工尺寸和机床的加工参数表选择电火花加工参数的过程,以便在实践中更好地掌握电火花加工技术。 相似文献
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Yan-Cherng Lin Ho-Shiun Lee 《International Journal of Machine Tools and Manufacture》2008,48(11):1179-1186
The gap conditions of electrical discharge machining (EDM) would significantly affect the stability of machining progress. Thus, the machining performance would be improved by expelling debris from the machining gap fast and easily. In this investigation, magnetic force was added to a conventional EDM machine to form a novel process of magnetic force-assisted EDM. The beneficial effects of this process were evaluated. The main machining parameters such as peak current and pulse duration were chosen to determine the effects on the machining characteristics in terms of material removal rate (MRR), electrode wear rate (EWR), and surface roughness. The surface integrity was also explored by a scanning electron microscope (SEM) to evaluate the effects of the magnetic force-assisted EDM. As the experimental results suggested that the magnetic force-assisted EDM facilitated the process stability. Moreover, a pertinent EDM process with high efficiency and high quality of machined surface could be accomplished to satisfy modern industrial applications. 相似文献