混粉电火花加工工艺初探

介绍了混粉电火花加工工艺的发展概况,解释了混粉电火花加工中出现的一些现象。文章认为,在一定加工时间的保证下,选择合理的加工规准,能够用混粉电火花加工机床加工面积１００ｃｍ＾２,表面粗工Ｒａ为１．８３μｍ的镜面。     

粉末特性对混粉电火花镜面加工的影响

用实验方法研究了粉末粒度、形状及导电性对混粉电火花镜面加工表面粗糙度的影响,同时对混粉电火花加工表面的耐磨性和耐蚀性进行了研究。结果表明,粉末粒度和导电性对混粉电火花加工表面粗糙度有较大的影响;混粉电火花镜面加工不但能改善加工表面粗糙度,且能提高加工表面的耐磨性和耐蚀性。     

混粉电火花加工工艺初探

介绍了混粉电火花加工工艺的发展概况，解释了混粉电火花加工中出现的一些现象。文章认为，在一定加工时间的保证下（１５ｈ） ，选择合理的加工规准，能够用混粉电火花加工机床加工出面积为１００ｃｍ２ 、表面粗糙度Ｒａ 为０ ．１８３μｍ 的镜面。     

混粉电火花镜面加工技术及应用

利用自行研制的混粉电火花镜面加工装置，对混粉电火花镜面加工影响因素，加工表面性能等进行了深入研究，找出了粉末特性，工件材料，粉末浓度及放电参数等对混粉电火花镜面加工的影响规律，给出了合理的混粉电火花镜面加工工艺条件，以文中确定的加工工艺条件对铸造和压铸模具进行混粉电火花镜面加工，结果表明，该技术能提高模具制造质量，降低工人劳动强度，缩短模具制造周期。     

电参数对混粉镜面电火花加工表面粗糙度影响的研究

介绍了混粉镜面电火花加工的实验装置,并应用单因素法初步研究了脉冲电参数对混粉大面积镜面电火花加工工件表面粗糙度的影响规律。     

电参数对混粉镜面电火花加工表面粗糙度影响的研究

介绍了混粉镜面电火花加工的实验装置 ,并应用单因素法初步研究了脉冲电参数对混粉大面积镜面电火花加工工件表面粗糙度的影响规律。取得了 5 9mm加工表面最小表面粗糙度为 Ra0 .3μm的结果     

混粉电火花镜面加工技术概述

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。     

混粉镜面电火花加工在模具制造中的应用研究

论述了混粉镜面电火花加工原理，介绍了混粉镜面加工的实验装置及不同加工方法的优劣，分析了混粉镜面电火花加工方法在型腔模具制造中的应用及发展。     

精密模具的大面积镜面加工技术

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     

混粉电火花加工技术在粗加工中的应用研究

在对混粉电火花加工机理进行系统研究的基础上，对混粉电火花粗加工中的加工效率和加工表面粗糙度进行了实验研究。结果表明，通过合理选择放电参数，混粉电火花加工在相近加工表面粗糙度时，能显著提高加工效率，从而为混粉电火花加工技术在粗加工中应用提供依据。     

添加剂对混粉电火花加工工作液的影响

粉末沉降速度对混凝土电火花加工作液性能有重要影响，是实现混粉电火花镜面加工的关键，本文采用实验对比的方法，研究了聚环氧乙烷类和芳烃类添加剂对粉末沉降速度的影响。结果表明，芳烃类添加剂能降低粉末沉降速度，在实验所用添加剂材料及添加浓度下，混粉电火花镜面加工效果得到明显改善。     

Electrical discharge machining using simple and powder-mixed dielectric: The effect of the electrode area in the surface roughness and topography

Electrical discharge machining (EDM) is one of the most widely disseminated manufacturing technologies, in particular as regards the generation of accurate and complex geometrical shapes on hard metallic components. Nevertheless current EDM technologies have major limitations when dealing with fine surface finish over large process area. Indeed this is one reason that explains the need of final manual polishing of mould cavities performed by EDM. Recently EDM with powder-mixed dielectric (PMD-EDM) has been a focus of an intense research work in order to overcome these technological performance barriers. This paper presents a research work within the objective to acquire deep knowledge on EDM technology with powder mixed dielectric and to compare its performance to the conventional EDM when dealing with the generation of high-quality surfaces. In particular the analysis of the effect of the electrode area in the surface quality measured by the surface roughness and craters morphology was carried out for both technologies. The results achieved evidenced a linear relationship between the electrode area and the surface quality measures as well as a significant performance improvement when the powder mixed dielectric is used.     

新型电火花混粉镜面加工液处理工艺流程及装置的设计

提出将磁力液力旋流器用于电火花加工工作液中加工渣的分离处理,分析了国内外普通电火花加工和混有导电性粉末物质的电火花加工分离处理过程的现状和存在问题,介绍了新型电火花加工工作液工艺流程及处理装置的特点和结构设计。     

Improvement of surface finish on SKD steel using electro-discharge machining with aluminum and surfactant added dielectric

Electrical discharge machining (EDM) process is widely used to process hard materials in the industry. Electrical discharge distribution effects can be achieved by the addition of Al powder in the dielectric. A fine surface roughness value of the workpiece is thus obtained. However, the electrostatic force among fine Al particles is found to agglomerate the Al powders in the dielectric. A surfactant can be adopted to separate the Al powder in the dielectric homogenously. A better surface even the mirror-like quality of the EDMed workpiece is thus desired. In the study, the effect of surfactant and Al powders added in the dielectric on the surface status of the workpiece after EDM is investigated.It is observed the best distribution effect is found when the concentrations of the Al powder and surfactant in the dielectric are 0.1 and 0.25 g/L, respectively. An optimal surface roughness (Ra) value of 0.172 μm is achieved under the following parameter—positive polarity, discharge current 0.3 A, pulse duration time 1.5 μs, open circuit potential 140 V, gap voltage 90 V and surfactant concentration 0.25 g/L.The surface roughness status of the workpiece has been improved up to 60% as compared to that EDMed under pure dielectric with high surface roughness Ra of 0.434 μm.     

微细液态添加剂光整电火花加工技术初探

提出了一种在普通电火花工作液中加入微细液态添加剂进行电火花光整加工的新方法.初步的试验结果表明,此法能显著改善工件的表面粗糙度,达到镜面效果.从液相添加剂的作用机理对微细液态添加剂电火花加工改善表面粗糙度的原因进行了解释.     

冷等离子体射流中微细电火花加工特性研究

采用晶体管脉冲电源,在氧气辅助氮气等离子体射流、氮氧混合等离子体射流及外部压缩空气辅助氮气等离子体射流等不同冷等离子体介质中进行了微细电火花加工特性的实验研究,以期确定加工过程稳定的工艺条件,达到提高加工效率和加工质量的目的。在氧气辅助氮气等离子体射流实验中发现,随着氧气流量的增加,材料去除速度和表面粗糙度值均有增大趋势;采用压缩空气辅助氮气等离子体射流的电火花加工在表面质量、边缘质量方面均优于氧气辅助氮气等离子体射流加工。     

Surface modification by electrical discharge machining: A review

The last decade has seen an increasing interest in the novel applications of electrical discharge machining (EDM) process, with particular emphasis on the potential of this process for surface modification. Besides erosion of work material during machining, the intrinsic nature of the process results in removal of some tool material also. Formation of the plasma channel consisting of material vapours from the eroding work material and tool electrode; and pyrolysis of the dielectric affect the surface composition after machining and consequently, its properties. Deliberate material transfer may be carried out under specific machining conditions by using either composite electrodes or by dispersing metallic powders in the dielectric or both. This paper presents a review on the phenomenon of surface modification by electric discharge machining and future trends of its applications.     

混粉电火花加工工作液流场及颗粒运动仿真研究

根据混粉电火花加工对装置的要求,在对储液箱内的粉末颗粒运动状态进行数学分析的基础上,采用COSMOS/Flo Works软件对工作液流场及颗粒运动状态进行模拟仿真.分析结果表明,设计的数学模型能反映储液箱内液流的实际运动状态,并能帮助对射流器喷液结构进行优化设计,该数学模型可为混粉电火花加工装置一体化设计提供技术支持.     

Electrical Discharge Surface Alloying of Ti and Fe Workpiece Materials Using Refractory Powder Compact Electrodes and Cu Wire

The paper reviews the use of metal powders dispersed in the dielectric fluid and refractory PM electrodes, to initiate workpiece surface modification during EDM. Experimental work details the effects of EDM parameters (up to 270 V) on the hardness/composition of the white layer following die sink machining of AISI H13 tool steel and roll texturing of 2% Cr steel using partially sintered PM electrodes. Similar data are presented following EDM scanning and wire cutting of standard TI alloy TI-6AI-4V and a y TIAI. With AISI H13, recast layers were 5-20 μm thick and up to ∼ 1350 HK_0.025. When machining TI-6AI-4V with WC/Co electrodes, recast microhardness was 600-2900 HK_0.025. Wire cutting y TIAI generated porous alloyed layers up to 115 μm thick with extensive cracks and no increase in bulk hardness.