Investigations on influence of process variables on crater dimensions in micro-EDM of γ-titanium aluminide alloy in dry and oil dielectric media
Investigations on influence of process variables on crater dimensions in micro-EDM of γ-titanium aluminide alloy in dry and oil dielectric media
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DOI：
10.1007/s00170-012-4235-8
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
G. Paul;S. Roy;S. Sarkar;N. Hanumaiah;S. Mitra
中科院分区：
文献类型：
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作者：
G. Paul;S. Roy;S. Sarkar;N. Hanumaiah;S. Mitra
在微细电火花加工（EDM）中，挑战在于提高材料去除率的同时保持凹坑尺寸的精度。阳极和阴极的材料性质以及工艺变量对MRR和准确性具有重要控制作用。采用200 μm厚的钢电极对γ-铝化钛合金工件进行了堆焊试验。在存在和不存在电介质流体的情况下，使用不同的微细EDM工艺变量来产生圆形凹坑，即，开路电压、放电电容、脉冲频率和脉冲开启时间。使用图像分析仪软件从光学显微镜图像测量过切。采用方差分析方法研究了工艺参数和最小过切量的最佳条件对熔坑尺寸的影响，结果表明，RC电路电容对熔坑的形成有显著影响，其次是脉冲频率。以放电能量和点火时间为两个函数，建立了两种介质的过切量的回归方程。同时还研究了在空气介质中的过切量小于在油介质中。
In micro-electro-discharge machining (EDM), challenge lies in enhancing material removal rate while retaining precision in crater dimensions. Material properties of both anode and cathode and the process variables have significant control on MRR and accuracy. In the present research, experiments were conducted on γ-titanium aluminide alloy work piece using 200-μm steel electrode. The circular craters were produced both in the presence and absence of dielectric fluid using varying micro-EDM process variables, i.e., open-circuit voltage, discharge capacitance, pulse frequency, and pulse-on time. Overcut was measured from optical microscope images using Image Analyzer software. Influences of process variables and optimal conditions for minimum overcut on crater dimensions were investigated using ANOVA test, which shows that capacitance of RC circuit contributes significantly in crater formation followed by pulse frequency. Regression equations of overcut for both dielectric mediums were developed using discharge energy and spark-on time as two functions. It was also investigated that overcut was less in air medium compared to oil medium.