Comparative study of different dielectrics for micro-EDM performance during microhole machining of Ti-6Al-4V alloy
Comparative study of different dielectrics for micro-EDM performance during microhole machining of Ti-6Al-4V alloy
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DOI：
10.1007/s00170-009-2298-y
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发表时间：
2010-05-01
影响因子：
3.4
通讯作者：
Bhattacharyya, B.
中科院分区：
文献类型：
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作者：
Kibria, G.;Sarkar, B. R.;Bhattacharyya, B.
在微细电火花加工中，电介质在加工过程中起着重要的作用。微细电火花加工过程中使用的电介质的性质对加工特性有很大的影响。本文研究了煤油、去离子水、碳化硼（B4 C）粉末悬浮煤油和去离子水等不同介质对微细电火花加工性能指标的影响，如材料去除率（MRR）、刀具磨损率（TWR）、过切、钛合金（Ti-6Al-4V）加工过程中入口和出口孔的直径变化以及表面完整性。实验结果表明，使用去离子水比煤油的MRR和TWR更高。此外，当悬浮颗粒，即，结果表明，在去离子水介质中，MRR增大，而TWR减小。通过扫描电镜（SEM）观察，发现去离子水处理后的工件表面白色层厚度小于煤油处理后的工件表面。此外，加工时间的比较研究已经进行了四种类型的刀具在不同的加工参数设置。此外，还借助扫描电镜和光学照片对每种类型的刀具的加工表面完整性和刀尖磨损情况进行了研究。因此，微细电火花加工Ti-6Al-4V的工作材料与B4 C混合磨料进行了调查，并报告了该过程的性能标准。研究结果表明，在Ti-6Al-4V合金微细电火花加工中，在去离子水溶液中加入碳化硼添加剂对提高加工性能有很大影响。
In microelectrodischarge machining (microEDM), dielectric plays an important role during machining operation. The machining characteristics are greatly influenced by the nature of dielectric used during micro-EDM machining. Present paper addresses the issues of microEDM utilizing different types of dielectrics such as kerosene, deionized water, boron carbide (B4C) powder suspended kerosene, and deionized water to explore the influence of these dielectrics on the performance criteria such as material removal rate (MRR), tool wear rate (TWR), overcut, diameteral variance at entry and exit hole and surface integrity during machining of titanium alloy (Ti-6Al-4V). The experimental results revealed that MRR and TWR are higher using deionized water than kerosene. Also, when suspended particles, i.e., boron carbide-mixed dielectrics are used, MRR is found to increase with deionized water, but TWR decreases with kerosene dielectric. Further analysis is carried out with the help of scanning electron microscope (SEM) micrographs, and it is found that the thickness of white layer is less on machined surface when deionized water is used as compared to kerosene. Also, a comparative study of machining time has been carried out for the four types of dielectrics at different machining parametric settings. Furthermore, the investigation on the machined surface integrity and wear on microtool tip have also been done in each type of the dielectrics with the help of SEM micrographs and optical photographs. Hence micro-EDM machining on Ti-6Al-4V work material with B4C-mixed dielectrics is performed in the investigation and reported the performance criteria of the process. It can be concluded from the research investigation that there is a great influence of mixing of boron carbide additive in deionized water dielectrics for enhancing machining performance characteristics in microEDM during microhole generation on Ti-6Al-4V alloy.