摘要
为了研究混气电火花加工中微气泡的形成机理,建立了微气泡数学模型。分析发现,微气泡的大小与气泡内外的压力差有关,压力越大,气泡直径越小。选择不同的混气压力进行了对比试验,结果表明:极间混入气体后改变了原有的放电状态,加工效率略有降低,电极绝对损耗变小,表面粗糙度值下降;随着混气压力的增加,放电间隙减小,增大了电蚀产物从极间排出的难度,加工效率继续降低,电极损耗基本不变,表面粗糙度值略有下降。
To study the forming mechanism of micro bubbles in mixed-air EDM,a mathematical model for micro bubbles has been established,finding out that the size of micro bubble has something to do with the pressure difference in and out it. The bigger the pressure difference is,the smaller the bubble will be. Contrast tests have been taken by choosing different pressure of gas. The results show that gas getting into the discharge gap changes the old discharge condition,leading to the decline of material removal rate,electrode absolute wear and surface roughness. With the rise of gas pressure,the discharge gap becomes narrower,which results in more trouble for erosion debris to get out of the gap,making material removal rate decrease,electrode wear not change and surface roughness decrease a bit.
作者
王祥志
刘志东
江炜
WANG Xiangzhi LIU Zhidong JIANG Wei(College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics ＆ Astronautics, Nanjing 210016, China Jiangsu Key Laboratory of Non-traditional Machining, Changzhou Institute of Technology, Changzhou 213032,China)
出处
《电加工与模具》
2017年第2期6-10,共5页
Electromachining & Mould
基金
江苏省自然科学基金青年基金资助项目(BK20150255
BK20150256)
江苏省科技支撑计划(工业)项目(BE2014051)
江苏省高校自然科学研究重大项目(15KJA460002)
常州市科技项目(CJ20159041)
常州工学院校级科研基金资助项目(YN1406)
