Influence of dielectric and machining parameters on the process performance for electric discharge milling of SiC ceramic
Influence of dielectric and machining parameters on the process performance for electric discharge milling of SiC ceramic
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DOI：
10.1007/s00170-011-3493-1
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发表时间：
2011-07
期刊：
影响因子：
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通讯作者：
R. Ji;Yonghong Liu;Yanzhen Zhang;Bao-ping Cai;J. Ma;Xiaopeng Li
中科院分区：
文献类型：
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作者：
R. Ji;Yonghong Liu;Yanzhen Zhang;Bao-ping Cai;J. Ma;Xiaopeng Li
碳化硅陶瓷具有优异的机械性能、耐磨性和耐高温腐蚀性能，在现代工业中得到了广泛的应用。然而，用传统的加工方法制备碳化硅陶瓷并不是一种高效的工艺。本文采用钢齿轮作为工具电极，对碳化硅陶瓷进行了电火花铣削加工。该工艺能够有效地加工大面积的SiC陶瓷。为了进一步提高工艺性能，本文提出了三种乳液作为介质。研究了介质、刀具极性、脉冲持续时间、脉冲间隔、峰值电压和峰值电流对材料去除率（MRR）和表面粗糙度（SR）等工艺性能的影响。利用扫描电子显微镜（SEM）、能谱仪（EDS）和x射线衍射仪（XRD）对加工表面的微观结构进行了分析。
Silicon carbide (SiC) ceramic has been widely used in modern industry because of its superior mechanical properties, wear, and corrosion resistance even at elevated temperature. However, the manufacture of SiC ceramic is not an efficient process by conventional machining methods. This paper employs a steel-toothed wheel as the tool electrode to machine SiC ceramic using electric discharge milling. The process is able to effectively machine a large surface area on SiC ceramic. To further improve the process performance, three kinds of emulsion are proposed as the dielectric in this paper. The effects of dielectric, tool polarity, pulse duration, pulse interval, peak voltage, and peak current on the process performance such as the material removal rate (MRR) and surface roughness (SR) have been investigated. Furthermore, the microstructure of the machined surface is examined with a scanning electron microscope (SEM), an energy-dispersive spectrometer (EDS), and X-ray diffraction (XRD).