Machining efficiency of powder mixed near dry electrical discharge machining based on different material combinations of tool electrode and workpiece electrode
Machining efficiency of powder mixed near dry electrical discharge machining based on different material combinations of tool electrode and workpiece electrode
复制标题
基于工具电极和工件电极不同材料组合的混粉近干式放电加工的加工效率
DOI：
10.1016/j.jmapro.2013.09.005
复制
发表时间：
2013-10-01
影响因子：
6.2
通讯作者：
Yang, Tingyi
中科院分区：
文献类型：
--
作者：
Bai, Xue;Zhang, Qinhe;Yang, Tingyi
粉末混合近干式放电加工（PMND-EDM）是一种新颖的放电加工（EDM）工艺。提出进一步提高干式电火花加工的加工效率。阐述了PMND-EDM的材料去除原理，提出了其去离子原理。分析了余热对MRR的影响。提出了多余余热的概念。对PMND-EDM加工效率的主要指标材料去除率(MRR)进行了研究。通过单因素实验，得到工具电极和工件电极不同材料组合下峰值电流、脉冲开启时间、脉冲关闭时间、流量、工具转速、气压和粉末浓度对MRR的影响。说明了 PMND-EDM 中的热现象。基于PMND-EDM的去离子原理，得出并分析了各工艺参数对PMND-EDM的MRR的影响。找出不同材料组合下 MRR 的差异。黄铜工具电极和W18Cr4V工件在大多数放电条件下都获得了较高的MRR，而当散热不当时，铜工具电极和45碳钢工件的MRR优势就会显现出来。基于PMND-EDM的去离子原理分析了其差异。 (C) 2013 年制造工程师协会。由爱思唯尔有限公司出版。保留所有权利。
Powder mixed near dry electrical discharge machining (PMND-EDM) is a novel electrical discharge machining (EDM) process. It is proposed to further improve the machining efficiency of dry EDM. The principle of material removal in PMND-EDM is illustrated and its deionization principle is proposed. The influence of residual heat on MRR is analyzed. The concept of superfluous residual heat is proposed. The material removal rate (MRR), the main index of machining efficiency for PMND-EDM process, is researched. Single factor experiments are performed to get effect of peak current, pulse on time, pulse off time, flow rate, tool rotational speed, air pressure and powder concentration on MRR under different material combinations of tool electrode and workpiece electrode. Thermal phenomena in PMND-EDM are illustrated. Effect of each process parameter on MRR of PMND-EDM is gotten and analyzed based on the deionization principle of PMND-EDM. Differences in MRR under different material combinations are found out. Brass tool electrode and W18Cr4V workpiece gain higher MRR under most of discharge conditions, while the superiority of copper tool electrode and 45 carbon steel workpiece in MRR arise when there is improper heat dissipation. The difference is analyzed based on the deionization principle of PMND-EDM. (C) 2013 The Society of Manufacturing Engineers. Published by Elsevier Ltd. All rights reserved.