| 摘要: |
| 针对传统电火花加工（EDM）微小孔过程孔内工作液流速较低，放电碎屑堆积在孔内难以排出，频
繁发生二次放电导致加工精度下降、加工成本增加的问题，提出一种基于超声运动辅助控制电极的方法。该方
法通过控制电极做超声平面二维圆周运动，利用高频振动提高工作液流速，增大侧面间隙加快碎屑排出，改善
了频发二次放电导致电极损耗过大的问题。通过建立流场仿真模型，从微小孔间隙工作液流场流速和孔内放电
碎屑排出两个方面分析了超声运动对工作液流场分布的影响。仿真分析表明超声运动提高了流场流速，减少了
碎屑排出孔内的时间。同时，进行了不同电极运动方式对比试验。试验结果进一步验证了该电极运动方式对电
火花微小孔加工过程减小电极损耗的积极影响。 |
| 关键词: 微细电火花 电极运动方式 超声平面二维圆周运动 流场仿真 |
| 基金项目:天津市科技军民融合重大专项（18ZXJM****160）；国家科技支撑计划资助项目（2015B****B04） |
|
| Research on Flow Field Simulation in Ultrasonic Micro-EDM Machining |
|
Liu Xuefeng Zhang Bo Liu Biao Liu Yi Liu Tingjian
|
|
Shanghai Aerospace Control Technology Institute, Shanghai 201109
|
| Abstract: |
| A method based on ultrasonic motion assisted electrode control is proposed to address the problems of
low flow rate of working fluid in the traditional electric discharge machining (EDM) micro-hole process, accumulation
of discharge debris in the hole that is difficult to discharge, frequent occurrence of secondary discharge leading to
decreased machining accuracy and increased machining costs. This method improves the problem of excessive electrode
wear due to frequent secondary discharge by controlling the electrode to perform ultrasonic planar two-dimensional
circular motion, utilizing high-frequency vibration to increase the working fluid flow rate, increasing the side gap to
accelerate debris discharge. By establishing a flow field simulation model, the influence of ultrasonic motion on the
distribution of the working fluid flow field is analyzed from two aspects of the flow velocity of the working fluid in the
small hole gap and the discharge of debris inside the hole. Simulation analysis shows that ultrasonic motion increases
the flow velocity and reduces the time for debris to be discharged from the hole. Meanwhile, comparative experiments
are conducted on different electrode motion modes. The experimental results further verify the positive effect of the
electrode motion on reducing electrode wear during the process of EDM micro-hole machining |
| Key words: micro-EDM electrode motion mode ultrasonic planar two-dimensional circular motion flow
field simulation |
