共查询到18条相似文献,搜索用时 156 毫秒
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短电弧铣削加工过程中,电参数对加工性能有着显著的影响,为了获得较好的工件表面质量、降低电极损耗以及提高加工效率,进行了电参数单因素实验研究,并对其进行分析。实验结果表明:相同加工条件下,随着占空比的增大,加工效率明显提升,但伴随着工件表面粗糙度值也相应变大;相对工具电极损耗与脉冲电压的变化息息相关,适当降低电压值可以减少电极损耗。 相似文献
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为减少短电弧铣削加工中火花放电及短路现象,保证电弧放电状态稳定,通过离子放电通道扩张规律、能量守恒定律推导电弧放电的伏安变化规律,将电弧放电波形分为3个特征阶段,作为电弧放电状态的判断依据,并通过放电波形验证理论的准确性。同时结合电弧断弧机制,建立机械断弧的几何模型,计算单脉冲电弧的持续时间,分析了电极转速对放电的影响;通过实验获取不同电弧持续时间下的微观形貌及电压电流波形,结果表明:电弧持续时间维持在0.5 ms时,加工质量较好,电弧放电稳定性高。研究结果为保证电弧加工过程中放电稳定性提供理论基础。 相似文献
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为使短电弧加工过程中电弧放电通道更容易、有效地建立,使其电源电气特性满足试验要求,通过分析短电弧加工脉冲电源系统的增益特性,设计出满足短电弧加工试验所需的电源反馈环路,并建立基于Matlab的电源反馈环路仿真模型,通过仿真验证了设计的电源反馈环路具有输出电压平稳,受外界干扰小,响应速度快等优点,具有良好的可行性及稳定性. 最后通过电源空载及短电弧切削加工试验,验证了设计的电源反馈环路能够满足短电弧加工试验所需要求,为短电弧加工机理研究提供了重要的技术支持. 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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