使用基于 CRITIC-MOORA 的集成方法对微线切割中低温处理的单管电极进行实验分析

Nivin Vincent, F. R. John
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摘要

目前的研究重点是旋转式单管黄铜电极在使用放电加工工艺对奥氏体不锈钢 SS316L 进行微钻孔之前进行浅低温处理(-140°C)的可行性。为了研究并实现更高的材料去除率和更低的电极磨损率,研究人员采用了代表电流、占空比、电容水平和间隙电压四个变量的 Taguchi L18 实验矩阵。为坚持加工实验的可持续性理念,采用了普通自来水作为介电流体,并结合 CRITIC(通过标准间相关性确定标准重要性)权重确定法和 MOORA(通过比率分析进行多目标优化)的综合混合方法进行决策。结果发现,MRR 和 EWR 的权重分数(重要性)分别为 0.5532 和 0.4467,MOORA 方法将多个目标参数转换为一个单一的目标函数,并为每个参数分配了权重分数。得出了一个理想的参数组合,突出了占空比、脉冲电流、电容水平和间隙电压的主导地位,其相应值为 70%-18A-1-34V,并通过相关的确认实验证实了结果。最高 MRR 为 10.0961 mm³/min,最低 EWR 为 3.9640 mm³/min。此外,还使用扫描电子显微镜(SEM)对电极尖端区域、微孔和周围工件表面进行了细致的检查和对比,从而验证了低温冷冻电极在成功微钻 SS316L 材料方面的价值和意义。
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Experimental Analysis of Cryogenic-Treated Single Tubular Electrodes in Micro-EDM Using CRITIC-MOORA Based Integrated Approach
The current research focuses on the viability of rotating, single tubular brass electrodes undergoing shallow cryogenic treatment (at -140°C) before micro-drilling austenitic stainless steel SS316L with the electrical discharge machining process. In order to study and achieve a better rate of material removal and a lower rate of electrode wear, the Taguchi L18 experimental matrix representing the four variables, current, duty cycle, capacitance level, and gap voltage was examined. Regular tap water served as the dielectric fluid to uphold the sustainability concept of the machining experiments and an integrated hybrid approach incorporating CRITIC (criteria importance through inter-criteria correlation) weight determination method and MOORA (multi-objective optimization by the ratio analysis) was applied for decision making. The weight fractions (significance) for MRR and EWR were found to be 0.5532 and 0.4467, respectively and the MOORA method converted multiple objective parameters into a single objective function with weight fractions assigned to each of them. An ideal parameter combination highlighting the dominant significance of duty cycle, pulse current, capacitance level and gap voltage with corresponding values of 70%-18A-1-34V was obtained and the results were substantiated with relevant confirmation experiments. The highest MRR achieved is 10.0961 mm³/min and the lowest EWR is found to be 3.9640 mm³/min. Moreover, the electrode tip regions, the micro holes, and the surrounding workpiece surfaces were also thoughtfully scrutinized and contrasted using scanning electron micrographs (SEM), which validates the worth and significance of cryogenically frozen electrodes in successful micro-drilling of SS316L material.
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