吕战竹,赵福令,杨义勇.混粉电火花加工介质击穿及放电通道位形研究[J].,2008,(3):373-377 |
混粉电火花加工介质击穿及放电通道位形研究 |
Research on dielectric breakdown and discharge channel in powder-mixed EDM |
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DOI:10.7511/dllgxb200803012 |
中文关键词: 电火花加工 混粉电火花加工 介质击穿 放电通道 |
英文关键词: electrical discharge machining (EDM) powder-mixed EDM dielectric breakdown discharge channel |
基金项目:国家自然科学基金委员会-中国工程物理研究院联合基金资助项目(10276009). |
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中文摘要: |
回顾了流光理论的基本过程,并运用流光理论对混粉电火花加工极间介质击穿的微观过程进行了详细论述.将粉末颗粒视为插入两电极之间的一串联电极,则极间距离以粉末颗粒为界分成两段,两段介质均以流光的形式击穿后,放电通道便由一电极表面经由粉末颗粒到达另一电极表面而形成串联放电.在此基础上,结合实验现象,研究了放电通道的位形,认为放电过程以单通道放电为主,而正极放电点面积的增大改变了正极表面的热量分布,最终确保了加工表面粗糙度的改善. |
英文摘要: |
The main procedures of the streamer breakdown of gas gaps were reviewed, and the dielectric fluid breakdown procedure of powder-mixed electrical discharge machining (EDM) was analyzed by means of the streamer theory. Considering the particle as an in-between electrode in series with the workpiece and tool electrode, the interelectrode gap can be divided into two sections. In each section, streamers can occur and expand rapidly, and the breakdown of the dielectric fluid is accomplished simultaneously. Thus the discharge channel connects the electrode couple via some certain particle and series-discharging is then conducted. According to the analytical results, the shape of the discharge channel was subsequently deduced combining with some experimental phenomena. The single-channel discharge model is accepted rather than the multi-channel discharge model. The bettering of the machined surface roughness is on account of the over expansion of the plasma channel radius near the anode which causes a decrease in the local energy density at the anode surface. |
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