Research on material removal rate of powder mixed near dry electrical discharge machining

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[1] [1,Bai, Xue
[2] 1,Zhang, Qin-He
[3] 1,Yang, Ting-Yi
[4] 1,Zhang, Jian-Hua
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Zhang, Q.-H. (zhangqh@sdu.edu.cn) | 1757年 / Springer London卷 / 68期
关键词：
Dry electrical discharge machining (EDM) is an environmentally friendly modification of traditional EDM; but the material removal rate (MRR) of dry EDM is very low. A new machining method called powder mixed near dry EDM (PMND-EDM); which can improve MRR effectively; is proposed. In order to find the relationship between processing parameters and processing effect and improve processing efficiency; the MRR of PMND-EDM is studied systematically. The main processing parameters; such as peak current; pulse on time; pulse off time; powder concentration; flow rate; air pressure; and tool rotational speed; on MRR of PMND-EDM are studied in experiments. The experimental results showed that the MRR of PMND-EDM increased with the increase of peak current; and air pressure; decreased with the increase of pulse off time and tool rotational speed; and increased firstly and then decreased with the increase of powder concentration. The significant test for process parameters on MRR of PMND-EDM is carried out through orthogonal design experiment. Analysis of variance for the result of orthogonal experiment indicates that peak current is significant at 99 % confidence level; pulse on time is significant at 95 % confidence level; and flow rate is significant at 90 % confidence level. Full factor experiments of peak current; and flow rate are conducted. The empirical formula of MRR is established based on experimental results. Its validity is demonstrated. © 2013 Springer-Verlag London;
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