CAJ | 학술논문

电极旋转是提高微孔电火花加工效率的有效手段,而极闻的工作液作为放电介质,其运动状态是影响微孔电火花加工放电状态和加工效率的关键因素之一.依据粘性流体运动学偏微分方程建立了旋转电极周围工作液的机理模型,应用FLUENT软件对此模型进行了流场计算与模拟,结果显示放电间隙内工作液为层流状态.结合得到的工作液流动规律,应用流场中微粒动平衡理论对电蚀产物颗粒的分布规律进行研究,发现电蚀产物颗粒在间隙内的分布只与颗粒直径有关.由此提出了通过调整放电参数来改变颗粒直径进而改善间隙放电状态的新方法,为合理选择放电参数提供了理论依据.
전겁선전시제고미공전화화가공효솔적유효수단,이겁문적공작액작위방전개질,기운동상태시영향미공전화화가공방전상태화가공효솔적관건인소지일.의거점성류체운동학편미분방정건립료선전전겁주위공작액적궤리모형,응용FLUENT연건대차모형진행료류장계산여모의,결과현시방전간극내공작액위층류상태.결합득도적공작액류동규률,응용류장중미립동평형이론대전식산물과립적분포규률진행연구,발현전식산물과립재간극내적분포지여과립직경유관.유차제출료통과조정방전삼수래개변과립직경진이개선간극방전상태적신방법,위합리선택방전삼수제공료이론의거.
Electrode rotation is an effective method to improve machining efficiency in micro-EDM (electrical discharge machining) process. The motion state of working fluid, which surrounds the revolving electrode as dielectric, is the key influence factor for micro-EDM discharge status and machining efficiency. Based on the kinematic partial differential equation of viscous fluid, the mechanism model of working fluid around the revolving electrode is proposed. Moreover, calculation and simulation of flow field are conducted by FLUENT software. The experimental results indicate that the flow status of working fluid in discharge gap is laminar flow. According to the obtained flowing law and dynamic balance theory of particle in the flow field, it is found that the distribution of interelectrode discharge debris is only related to the debris size. A new way of changing the debris size by adjusting discharge parameters is presented to improve the gap discharge status, which provides the basic theory for choosing the proper discharge parameters.