Study on overlap rate of discharge craters based on finite-continuous pulse discharges
Study on overlap rate of discharge craters based on finite-continuous pulse discharges
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DOI：
10.1016/j.procir.2022.09.146
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Shaojie Hou;Jicheng Bai;Boyu Tian;Liu Huan
中科院分区：
文献类型：
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作者：
Shaojie Hou;Jicheng Bai;Boyu Tian;Liu Huan
微细电火花加工中，放电集中容易引起电弧、短路等异常放电状态，严重影响加工效率和加工表面完整性等加工性能。在研究中，放电火山口的重叠率（ORC）的概念被提出来表征和量化排放浓度。基于有限-连续脉冲放电法和田口实验设计，进行了放电实验，分析了电极转速、开路电压、限流电阻和脉冲宽度等加工参数对ORC的影响。结果表明，限流电阻是影响ORC的最重要因素，并探讨了限流电阻等参数对ORC的潜在影响机理。基于信噪比分析对加工参数进行了优化。最后将优化后的参数用于电火花铣削加工，并对加工表面进行了运行图分析。结果表明，采用优化后的参数进行电火花加工，可以显著降低放电浓度，提高加工表面粗糙度的一致性。研究结果为解释加工参数对加工结果的潜在影响机理和进一步提高加工性能提供了一个清晰的视角。
The abnormal discharge states such as arc and short circuit are easily caused by discharge concentration in micro-EDM, which will seriously affect the processing performances such as machining efficiency and machined surface integrity. In the study, the concept of overlap rate of discharge craters (ORC) was proposed to characterize and quantify discharge concentration. Based on the finite-continuous pulse discharges method and Taguchi experimental design, the discharge experiments were carried out, and the influences of machining parameters such as rotation speed of electrode, open circuit voltage, current limiting resistance and pulse width on ORC were analyzed. The results show that the current limiting resistance is the most significant influencing factor for ORC, and the potential influential mechanisms of current limiting resistance and other parameters on ORC were discussed. The machining parameters were optimized based on signal-to-noise ratio analysis. Finally, the optimized parameters were used for EDM milling, and the machined surfaces were analyzed by run chart. The results show that EDM with the optimized parameters can significantly reduce discharge concentration and improve the consistency of surface roughness. The results of this study enable a clear perspective to explain the potential influencing mechanism of the machining parameters on the machining results and further improve the machining performance.