共查询到20条相似文献,搜索用时 171 毫秒
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基于MEMS器件的微细加工技术,提出了在微电流密度下电化学钝化机理基础上,用高频振动效应消除钝化,用与高频振动同频同步的窄脉冲电流电解作用去除机体材料,实现电解复合微细加工,这是微细加工技术的新构想及发展趋势. 相似文献
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复合超声振动的脉冲电流电解去毛刺试验研究 总被引:1,自引:0,他引:1
针对针阀体喷孔采用脉冲电流电解去毛刺后,存在喷孔内入口处倒圆半径偏差较大、喷孔流量分散度较大的问题,提出采用超声辅助振动工具阴极进行小初始加工间隙电解去毛刺加工,分析了复合超声振动的脉冲电流电解去毛刺工艺特点.针阀体喷孔电解去毛刺试验数据表明:采用超声辅助振动工具阴极后,倒圆半径偏差得以减小,流量分散度有所降低. 相似文献
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高频,窄脉冲电流电解加工模具试验研究 总被引:4,自引:0,他引:4
分析了高频、窄脉冲电流电解加工过程的物理、化学特性及对加工结果的影响,进行了高叔、窄脉冲电流电解加工模具试验。表明高叔、窄脉民流能显著改善电解成形过程的理、化特性,较大提高成形精度及改善表面质量,在精密模具加工中开辟了新的应用前景。 相似文献
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电解加工技术的新发展——高频窄脉冲电流电解加工 总被引:11,自引:0,他引:11
综述了国内外脉冲电流电解加工研究和应用概况 ,重点介绍了 MOSFET脉冲电源高频窄脉冲电流电解加工 ( HSPECM)特性及加工精度、表面质量的试验研究。研究表明 HSPECM较大地改善了阳极溶解过程理化特性 ,可以较大幅度地提高电解加工精度 ,具有广阔的应用前景 相似文献
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磁场复合电解加工间隙磁场的有限元分析 总被引:2,自引:0,他引:2
为了研究永磁体不同设置对磁场复合电解加工间隙磁场分布的影响,建立了磁场复合电解加工间隙磁场分析的数学模型和有限元模型,采用ANSYS软件对其进行了分析。结果表明:当永磁体置于阳极下方且磁化方向垂直于阳极时,磁场对电解加工几乎无影响;而当永磁体置于阳极下方且磁化方向平行于阳极时,间隙中的磁场强度较为均匀且磁场方向与电场方向垂直,有利于提高电解加工的效率和型面的加工精度。分析结果与试验结果一致。 相似文献
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The objective of the present research is to simulate cylindrical electro-chemical magnetic abrasive machining (C-EMAM) process for magnetic stainless steel (AISI-420). C-EMAM is a new hybrid machining process used for high efficiency finishing of cylindrical jobs made of advanced engineering materials. The material is removed from the workpiece surface due to simultaneous effect of abrasion and electrochemical dissolution. Finite element method is used to calculate the distribution of magnetic field between the magnetic poles in which cylindrical shaped workpiece is placed. The cutting forces responsible for abrasion are calculated from the magnetic forces due to gradient of magnetic field in the working gap. The effect of electrochemical dissolution and abrasion-assisted dissolution are incorporated into the C-EMAM process model using empirical relation for average anodic current. The empirical relation is correlated with the input parameters in the present system based on experimental results. Finally a surface roughness model is developed by considering total volume of material removed with the assumption of triangular surface profile. The simulation results for material removal and surface roughness are validated using experimental results. The simulated results agree with experimental observations. 相似文献
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Monitoring and control of the micro wire-EDM process 总被引:1,自引:1,他引:1
Mu-Tian Yan Hsing-Tsung Chien 《International Journal of Machine Tools and Manufacture》2007,47(1):148-157
A new pulse discriminating and control system has been developed for process monitoring and control in micro wire-EDM. The pulse discriminating and control system identifies four major gap states classified as open circuit, normal spark, arc discharge and short circuit based on the characteristics of gap voltage waveform. The effect of pulse interval, machining feedrate and workpiece thickness on the variations of the proportion of normal spark, arc discharge and short circuit in the total sparks (defined as normal ratio, arc ratio and short ratio, respectively) were investigated. It is found that a long pulse interval results in an increase of the short ratio under a constant feedrate machining condition. A high machining feedrate or an increase of workpiece height results in an increase of the short ratio. To achieve the stability of the machining operation, a control strategy is proposed by regulating the pulse interval of each spark in real-time according to the identified gap states. Experimental results indicate that the developed pulse discriminating and control system can significantly reduce the arc discharge and short sparking frequency as well as achieve stable machining under the condition where the instability of machining operation is prone to occur. 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
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The Effects of Tool Electrode Size on Characteristics of Micro Electrochemical Machining 总被引:2,自引:0,他引:2
In micro electrochemical machining using ultra short pulses, the machining rate is significantly influenced by the tool electrode area. As the tool area increases, the electrical double layer capacitance increases and the electrolyte resistance decreases. As a result, the rising time of the double layer potential increases and it is more difficult to obtain effective machining potential within the ultra short pulse duration. A simple insulation method using enamel coating on the side wall of the tool electrode is introduced. The insulated tool electrode was not sensitive to the machining depth and was effective for machining high aspect ratio structures. 相似文献
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以一种可实现恒定加工间隙的方法为对象,设计了电解液背压式正向流动的方式,以提高加工过程的稳定性。采用有限元方法开展了流场仿真研究,优化了出液口结构。分析表明:与开放式正向流动相比,背压式正向流动加工间隙内的流场更均匀稳定。为了验证流场设计的合理性,开展了恒间隙法脉冲电解加工对比实验。结果显示:与开放式正向流动相比,背压式正向流动加工过程的电流波动量从23%下降到4%,加工表面粗糙度值从Ra1.237μm下降到Ra0.608μm。实验结果证明采用背压式正向流动有助于提高恒间隙法电解加工的稳定性和表面质量,为电流效率曲线的精确测定提供了有效途径。 相似文献