共查询到19条相似文献,搜索用时 109 毫秒
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导电性工程陶瓷材料的放电加工研究 总被引:4,自引:0,他引:4
通过专用脉冲电源脉冲放电能量的控制,进行了导电性工程陶瓷材料的电火花放电加工试验研究,提供了一种稳定加工导电笥工程陶材料且能控制加工质量的电火花放电加工方法。 相似文献
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介绍了一种利用两个功率开关管对电容器充、放电电压和放电通道消电离过程进行控制 ,实现脉冲放电能量与输出功率控制 ,进而改善加工质量的新方法。 相似文献
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探讨超声振动、磨削和脉冲放电加工的交互作用,并从工件材料去除的体积入手,计算脉冲放电能量去除的材料体积,得出普通磨削去除的材料体积,建立轴向超声振动辅助磨削-脉冲放电复合加工磨削力模型,探索各加工参数对磨削力的影响规律,对磨削力的检测和控制具有一定的指导作用。 相似文献
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目前,高速往复走丝电火花线切割最高切割效率已突破200mm2/min,传统脉冲电源靠单纯提高脉冲能量来增加切割效率会导致钼丝损伤大、损耗加剧,短时间内就可能出现断丝。从脉冲电源的放电波形分析入手,分析了传统脉冲电源和高效低损耗脉冲电源的差异。研究认为,采用阶梯脉冲合理控制放电电流的前后沿,在加工中对非正常放电脉冲及时切断以减小对电极丝造成的损伤及损耗,采用等能量脉冲方式提高放电利用率等措施能大大提高切割效率,改善切割表面粗糙度,在切割效率190~200mm2/min条件下能实现长期稳定切割。 相似文献
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设计了以DSP和CPLD为控制单元的微细电火花脉冲电源,满足微细电火花加工单个脉冲能量小而可控的要求。针对加工过程难以用数学模型描述的问题,利用智能控制不依赖数学模型的优势,设计了模糊神经网络控制器,根据间隙放电状态,对在线参数实时调整。通过微小孔加工实验表明,采用智能控制的加工方式可以提高加工速度,有很好的应用前景。 相似文献
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通过一系列的实验得出脉冲宽度或脉冲间隔与加工表面粗糙度、精度、机床型号的关系,总结出放电电路能量及电流脉冲宽度、脉冲间隔对线切割电火花精加工表面粗糙度的影响规律.在实际生产加工中,结合实际清况,选择合适的脉冲宽度、脉冲间隔比,调节出合适的加工速度,这样能有效地控制工件的表面粗糙度,提高加工效率.实验结论可为提高线切割加工质量找出一条新途径,也为今后高频电源的开发,加工技术的提高提供重要参考依据. 相似文献
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超白玻璃是一种超透明低铁玻璃,因其具有优越的物理、光学性能,而广泛应用于精密电子、高档汽车及太阳能光伏发电领域。由于其本身的硬脆特性,玻璃微孔的出口极易破损,为提高玻璃微孔的加工定域性,降低微孔出口破损的可能性,对微细电化学放电钻削加工工艺进行了研究与优化。首先,根据电化学放电原理,探讨了气膜的形成和材料去除机理,分析了放电能量对玻璃微孔加工工艺的影响,建立了单位时间电化学放电加工能量控制模型;其次,试验分析了电压幅值、占空比、脉冲频率、进给速度等主要参数对微孔入口直径和出口质量的影响;最后,通过优化后的加工参数在厚度为300μm的超白玻璃试件上,成功加工得到入口直径为172μm、出口直径为167μm的3×3微孔阵列结构,出口无破损现象。实验结果表明,基于脉冲能量控制的微细电化学放电钻削工艺在玻璃微孔加工方面很有潜力。 相似文献
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Yinsheng Fan Chaojiang Li Jicheng Bai Qiang Li 《The International Journal of Advanced Manufacturing Technology》2014,72(9-12):1687-1691
Wire electrical discharge machining (WEDM) is widely used in aerospace, mold manufacturing, automotive, and other fields. But now, traditional WEDM pulse power contains current-limiting resistor, and its energy utilization rate is low. Meanwhile, discharge energy of WEDM pulse power cannot be accurately controlled, and there is no unified understanding of distribution about discharge energy. In this paper, the pulse power improves energy utilization rate by removing current-limiting resistor and adopting single-arm pulse width modulation control method which controls peak current and modulates long short-circuit pulse width. Experiments proved that the energy-saving pulse power improves energy utilization rate by, approximately, 67.6 % than traditional pulse power. The paper analyzed a single-pulse energy waveform of the energy-saving pulse power and calculated each spark pulse energy and total energy provided by pulse power. It found that gap spark discharge energy only accounted for about 51 % of the energy provided by the pulse power, and other energy was mainly consumed in switching loss of power switch and parasitic resistance of pulse power. 相似文献
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This paper describes the method to increase discharge energy in micro-EDM using electrostatic induction feeding as the pulse generator. In a previous study, controlled pulse train method was introduced to increase discharge energy and enlarge unit removal per discharge by allowing multiple discharges to occur at the same spot. During observation, it was found that the oscillation of discharge current is excited at higher amplitude even if the same capacitance is used. In this paper, the influence of frequency on discharge energy was investigated. It was found that higher discharge energy can be obtained when machining was done at the resonant frequency of the circuit. Influence of capacitance and inductance on resonant frequency was studied. Probability of discharge continuity at different frequencies was examined. The results confirmed that higher discharge continuity within the pre-determined pulse train duration can be achieved when machining is conducted at resonant frequency, leading to higher material removal rate (MRR). 相似文献
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Fuzhu Han Jun Jiang Dingwen Yu 《The International Journal of Advanced Manufacturing Technology》2007,34(5-6):538-546
Surface roughness is significant to the finish cut of wire electrical discharge machining (WEDM). This paper describes the
influence of the machining parameters (including pulse duration, discharge current, sustained pulse time, pulse interval time,
polarity effect, material and dielectric) on surface roughness in the finish cut of WEDM. Experiments proved that the surface
roughness can be improved by decreasing both pulse duration and discharge current. When the pulse energy per discharge is
constant, short pulses and long pulses will result in the same surface roughness but dissimilar surface morphology and different
material removal rates. The removal rate when a short pulse duration is used is much higher than when the pulse duration is
long. Moreover, from the single discharge experiments, we found that a long pulse duration combined with a low peak value
could not produce craters on the workpiece surface any more when the pulse energy was reduced to a certain value. However,
the condition of short pulse duration with high peak value still could produce clear craters on the workpiece surface. This
indicates that a short pulse duration combined with a high peak value can generate better surface roughness, which cannot
be achieved with long pulses. In the study, it was also found that reversed polarity machining with the appropriate pulse
energy can improve the machined surface roughness somewhat better compared with normal polarity in finish machining, but some
copper from the wire electrode is accreted on the machined surface. 相似文献
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V. A. Makeev V. I. Gusel’nikov A. V. Stepanov E. G. Furman Fu Quan Wang 《Instruments and Experimental Techniques》2006,49(4):531-533
A generator is described that is intended for operation in the area of electric-discharge technologies. Depending on the electrical strength of the load, the generator produces voltages of up to 50 kV, the dissipated energy of the pulse is up to 200 J, and the pulse repetition rate is up to 100 Hz. The generator is based on the direct discharge of capacitors to a discharge gap through a coaxial cable with a length of up to 200 m and without additional switching components. The circuit stabilizing the pulse energy due to recuperation of the unused energy in the filter capacitor of the power supply is used to stabilize the energy dissipated by the load. 相似文献
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A discharge module allowing the formation of arbitrarily shaped power pulses with durations of up to 1 s and pulse energies of several kilojoules in the pumping lamp has been developed. Transient processes in the circuit are analyzed and the main parameters of the converter at a given pulse energy are determined. Features of the high-frequency converter’s operation with power feedback into a nonlinear load under the conditions of a severalfold decrease in the storage voltage are considered. A circuit for controlling the power-regulating switch and maintaining the relative value of power pulsations in the lamp at a constant level is proposed.__________Translated from Pribory i Tekhnika Eksperimenta, No. 4, 2005, pp. 51–56.Original Russian Text Copyright © 2005 by Togatov, Gnatyuk. 相似文献