冷等离子体射流中微细电火花加工特性研究

摘要

This paper investigated the characteristics of micro EDM in cold plasma jet using a set of transistor electrical pulse generator. In order to stabilize machining process and improve the machining efficiency and quality ,oxygen-assisted nitrogen plasma jet (NPJ) ,nitrogen-oxygen mixed plasma jet and compressed air assisted NPJ were proposed as dielectric media in micro EDM. It was found that the material removal rate and surface roughness increased with the increase of oxygen flow rate in oxygen-assisted NPJ experiment. In addition ,it was found that the surface quality and edge quality of micro EDM with compressed air-assisted plasma jet have been improved significantly compared to that with oxygen-assisted NPJ.%采用晶体管脉冲电源,在氧气辅助氮气等离子体射流、氮氧混合等离子体射流及外部压缩空气辅助氮气等离子体射流等不同冷等离子体介质中进行了微细电火花加工特性的实验研究,以期确定加工过程稳定的工艺条件,达到提高加工效率和加工质量的目的.在氧气辅助氮气等离子体射流实验中发现,随着氧气流量的增加,材料去除速度和表面粗糙度值均有增大趋势;采用压缩空气辅助氮气等离子体射流的电火花加工在表面质量、边缘质量方面均优于氧气辅助氮气等离子体射流加工.