电火花深小孔加工的实验研究  

Experiment Research for Deep-Small Hole Drilling by EDM

作　　者：吴品[1] 裴景玉[1] 邓容[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《电加工与模具》2007年第1期10-12,16,共4页Electromachining & Mould

摘　　要：采用不同旋转速度的电极进行电火花深小孔加工,通过采集加工时间数据,得到多条加工曲线。分析曲线结果表明,在特定转速范围内加工效率最高,低于或者高于这个转速,加工效率都会下降。利用流体力学和边界层理论可分析得出:电极转速太慢,能转化为极间液体的机械动能太小;而转速太快,靠近孔内壁的部分液体则处于相对静止的状态。这两种情况都会使极间液体的动力稳定性变差,将导致加工效率的下降。In electrical discharge machining deep-small holes process, fluid status between me EDM gaps was one of the primary factors affecting stability during machining work pieces. The experiment used electrode with different rotation speed to process deep-small holes, and collected the time data during the whole process, after this more of the processing curves could be formed. Through analysis of these curves, it was demonstrated that only specific speed can lead to the maximum machining efficiency, which would go down when the speed became slow or fast. Fluid mechanics and boundary layer analysis showed that there was little kinetic energy transferred into liquid between gaps when the rotation speed was too slow, whereas when the speed was too fast, some of the liquid near the pore wall would become relatively static. Both cases would make the dynamic stability of gap liquid badly, which would lead to the decline in the efficiency of processing.

关 键 词：电火花加工 旋转速度 加工效率 边界层 动力稳定性 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]