Experimental investigation on the discharge stability in micro-EDM based on finite-successive pulses discharge method
Experimental investigation on the discharge stability in micro-EDM based on finite-successive pulses discharge method
复制标题
基于有限连续脉冲放电法的微细电火花加工放电稳定性实验研究
DOI：
10.1088/1361-6463/aae556
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发表时间：
2018-10
期刊：
影响因子：
--
通讯作者：
Jiajing Tang
中科院分区：
文献类型：
--
作者：
Zhengkai Li;Jicheng Bai;Jiajing Tang
放电稳定性对于微放电加工 (EDM) 性能（例如材料去除率、刀具磨损率和表面完整性）至关重要。本研究基于有限连续脉冲放电方法，重点关注有效放电率（EDR）和凹坑分布均匀性（UCD），系统探讨了微细放电加工的放电稳定性。具体来说，采用了一种新颖的均匀性指数方法来实现 UCD 的数学表征。通过方差分析评估开路电压、峰值电流、脉冲持续时间、占空比、电极转速、间隙宽度和介电介质等基本参数对EDR和UCD的影响。结果表明，脉冲持续时间是 EDR 的重要参数，而峰值电流是 EDR 和 UCD 的重要参数。此外，还讨论了加工参数对EDR和UCD的影响机制。最后，通过信噪比响应图得到最优参数组合，并通过验证实验证实了基于EDR和UCD优化加工参数的可行性。这项工作的结果有望有助于从更清晰的角度实现参数优化，并进一步提高微细放电加工性能。
The discharge stability is crucial for micro-electrical discharge machining (EDM) performances such as material removal rate, tool wear ratio and surface integrity. In this study, based on the finite-successive pulses discharge method, the discharge stability of micro-EDM was systematically explored by focusing on the effective discharge rate (EDR) and uniformity of craters distribution (UCD). Specifically, a novel uniformity index method was adopted to achieve the mathematical characterization of UCD. The effects of the essential parameters including open-circuit voltage, peak current, pulse duration, duty cycle, electrode rotating speed, gap width and dielectric medium on EDR and UCD were assessed by analysis of variance. The results indicated that the pulse duration is a significant parameter for the EDR, while the peak current is significant parameter for both EDR and UCD. Moreover, the influencing mechanisms of machining parameters on EDR and UCD were also discussed. Finally, the optimal parameter combinations were obtained through signal-to-noise (S/N) ratio response graphs, and the feasibility to optimize machining parameters based on EDR and UCD was confirmed by verification experiments. The results of this work are expected to be helpful to achieve parameter optimization from a clearer perspective, and further improve the micro-EDM performances as well.
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