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空气中微细电火花沉积的工艺规律研究 总被引:3,自引:1,他引:3
论述了一种新的电火花加工方法,它通过合理选择工艺条件在空气中将金属材料放电沉积在工件上。对电火花沉积加工的基本原理进行了分析,预测了实现条件,使用通用的电火花成形加工机床和常见的电极材料黄铜,在空气介质中,通过大量实验对微细电火花沉积进行了系统研究,得出各工艺参数的影响规律。在高速钢工件表面沉积出直径为0.19mm、高度为7.35mm的微小圆柱体。对沉积材料的测试表明,沉积材料致密,与基体结合紧密,成分取决于工具电极材料,同时基体硬度得到提高。 相似文献
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本文介绍了微细电火花加工技术的研究开发现状,讨论了传统的电火花加工、线放电磨削加工等微细加工的方法及其应用。 相似文献
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微细电火花加工的发展现状与展望 总被引:1,自引:0,他引:1
王克锡 《世界制造技术与装备市场》2000,(1):30-33
目前,尽管出现了各种不同的微细加工方法,但由于微细电火花加工法具有独特的优点,因此采用此种方法可以制成各种极微细的高硬度(金刚石烧结体和硬质合金)工具、复杂形状的模具和工件,为此受到业界的普遍关注。 相似文献
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通过设计单脉冲放电实验,获得加工材料的表面形貌,以及单脉冲放电形成的凹坑.根据不同参数下材料的表面形貌,分析主要电参数与加工表面粗糙度的关系,以及加工表面凹坑的形成原因,得到影响加工质量的主要参数. 相似文献
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随着许多工业及民用设备的小型化,日益需要进行微细复杂形状的高精度加工,特别是对高密度、高深径比形状的模具进行高精度加工更为需要。为满足这方在要求,目前国外研究开发了一种微细电火花加工技术、在穿孔加工中已能够加工出直径5μm的微孔。 过去,对微小复杂形状的电火花加工采用的方法是:使用简单的棒状电极,类似铣削的加工方式,并采用对电极损耗进行补偿或在低损耗状态下进行加工的 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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MICRO ELECTRICAL DISCHARGE MACHINING DEPOSITION IN AIR 总被引:1,自引:0,他引:1
JIN Baidong ZHAO Wansheng WANG Zhenlong CAO Guohui School of Mechanical Engineering Harbin Institute of Technology Harbin China 《机械工程学报(英文版)》2006,19(4):622-625
A new deposition method is described using micro electrical discharge machining (EDM) to deposit tool electrode material on workpiece in air. The basic principles of micro electrical discharge deposition (EDD) are analyzed and the realized conditions are predicted. With an ordinary EDM shaping machine, brass as the electrode, high-speed steel as the workpiece, a lot of experiments are carried out on micro EDD systematically and thoroughly. The effects of major processing parameters, such as the discharge current, discharge duration, pulse interval and working medium, are obtained. As a result, a micro cylinder with 0.19 mm in diameter and 7.35 mm in height is deposited. By exchanging the polarities of the electrode and workpiece the micro cylinder can be removed selectively. So the reversible machining of deposition and removal is achieved, which breaks through the constraint of traditional EDM. Measurements show that the deposited material is compact and close to workpiece base, whose components depend on the tool electrode material. 相似文献
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气体放电加工基础工艺试验研究 总被引:1,自引:2,他引:1
采用单因素法进行了基本的工艺参数(电参数、伺服参考电压等)对气体介质放电加工性能影响的试验研究。试验结果表明:气体介质的放电加工适于采用正极性加工。在试验加工的范围内,工件的蚀除速度和表面粗糙度值随脉冲宽度和峰值电流的增加而增加,随脉冲间隔的增加而减小。极间并联合适的电容能够使加工速度和加工表面粗糙度有所改善,并对此现象进行了分析。对于某一确定的加工参数,存在一个较佳的伺服参考电压值,使加工性能较为稳定。工具电极具有较高的旋转速度能够使气体放电加工性能得到提高。使用氧气介质能够实现快速电火花加工,并根据不同气体的物理性能对不同气体介质的加工性能进行了分析。工件表面显微硬度测试结果表明:空气中放电加工的工件的表面硬度比基体硬度高,比煤油中加工的工件表面硬度低。 相似文献
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气中电火花线切割加工技术研究 总被引:13,自引:3,他引:13
传统的电火花加工,一般都在液体介质中进行,如煤油等。虽然液体介质被认为是平稳和高效加工所必需的,但是它可以造成环境污染。在分析压缩气体条件下进行电火花加工机理的基础上,提出一种气中电火花线切割加工的新工艺。其运动着的电极,甚至在大气中也可以从加工间隙中排除加工屑;而且将其用于精加工(多次切割)时,可获得沿工件厚度方向上比液中加工时更高的直线度。低速走丝试验结果证明了上述的优点。高速走丝气中电火花线切割加工的初步试验结果表明,气中电火花线切割加工具有广阔的应用前景。 相似文献
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基于统计分析的电火花线切割加工稳定性研究 总被引:1,自引:0,他引:1
研制了电火花线切割加工间隙放电状态检测系统,并运用时序分析理论中的统计检验的方法对加工中由正常放电相对时间比率值构成的时间序列进行了分析,指出了电火花线切割加工稳定时的正常放电相对时间比率值构成的时间序列的统计特征。提出用量纲一波形参数——峰度值(峭度系数)来判断电火花线切割加工的稳定性,用试验的方法研究了该方法的可靠性,为采取适当的电参数控制策略,提高加工稳定性提供了重要的依据。 相似文献
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Gokhan Kucukturk 《Machining Science and Technology》2013,17(2):189-207
In this study, a new method for machining of nonconductive ceramic workpieces in electric discharge machining (EDM) was developed. Machining surfaces of nonconductive workpieces were coated with a conductive layer (CL) and graphite powder was added to dielectric fluid for machining. Al2O3, ZrO2, SiC, B4C and glass workpiece samples were machined by using the method. Different machining conditions were tested for each sample and optimum machining parameters were determined. Effect of electrical conductivity, thermal conductivity and melting point of workpieces on material removal rate (MRR) was investigated. Optical microscope and SEM (Scanning Electron Microscope) surface photographs of workpieces taken after machining are presented and discussed. 相似文献
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This article presents a new method for discrimination of various types of pulses generated during an electrical discharge machining process in presence of a rotating electrode. Existing pulse discrimination methods do not perform efficiently in an electrical discharge machine with rotating electrode, as arcs rarely occur during the machining process. Our method involves simultaneous comparison of the gap voltage and current signals with various thresholds. The main advantage of our proposed method is its efficient computation and significantly better accuracy in discriminating between various pulse classes for electrical discharge machining devices with rotating electrode. Experimental studies demonstrate a superior performance of our method in distinguishing normal pulses from harmful arcs, open circuit and short circuit pulses, compared with the state-of-art methods. 相似文献
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In this study, the geometric wear characteristics of tool electrodes were obtained for various pulse time, discharge current and machining depth settings in electric discharge machining. Different forms of protrusions were machined on the front surface of the tool to reduce the geometric wear. Significant reductions in original tool geometric wear characteristics (front wear, side wear and edge wear) were obtained with the use of square cross-section protrusions. The dimensions of the square cross-section protrusions were modeled mathematically in terms of machining parameters used in the experiments. 相似文献
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Ouyang Hua Yang BoZhong Fangyuan Gu ChuanggangKey Laboratory of Education Ministry ofPower Machinery Engineering Shanghai Jiaotong University Shanghai China 《机械工程学报(英文版)》2003,16(1)
A new type fully reversible combined blade is presented, which can fully reverse airflow during the inverse ventilation by simply reversion. It is suitable for reversible axial flow fans used in tunnel and mine ventilation. The optimal parameters such as overlap ratio and pitch ratio are determined through cascade experiment. Experiment results also show a big promotion of maximum lift coefficient C1,max and stall attack angle a1,max compared to the existing bi-directional symmetry airfoils. 相似文献