EFFECTS OF ELECTRODE INSULATION THICKNESS ON ELECTROCHEMICAL DRILLING STABILITY AND ACCURACY  

绝缘层厚度对孔电解加工稳定性和精度的影响(英文)

作　　者：王维[1] 朱荻[1] 曲宁松[1] 黄绍服[1] 房晓龙[1] 

机构地区：[1]南京航空航天大学江苏省精密与微细制造技术重点实验室

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2009年第3期163-169,共7页南京航空航天大学学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(50635040);the National High Technology Research and Development Program of China("863"Program)(2006AA04Z321);the Natural Science Foundation of Jiangsu Province(BK2008043)~~

摘　　要：Effect of electrode insulation on the electric field and the flow field of the machining gap during electrochemical drilling（ECD） is numerically studied. Electric field simulation shows that the current density along the side gap decreases with increasing the thickness of electrode insulation. And the analysis of the electrolyte flow in the frontal gap shows that the insulation thickness has a remarkable influence on the pressure distributions. Ex- periments investigate the influence of the insulation thickness on the main characteristics of the machined hole, i.e. , radial overcut, entrance conicity, and current stability. The poor hole is observed and identified as most likely to occur with a combination of the low tool feed rate and the low insulation thickness. The appropriate thickness of the insulating layer leads to an improvement on hole accuracy and machining stability.通过对孔电解加工中加工间隙的电场和流场仿真,研究了电极绝缘层的涂覆尺寸特征对小孔加工性能的影响。进行了管电极电解小孔的试验,得到了理想的绝缘层厚度参数。试验和仿真均表明,增大绝缘层厚度可以减小孔的侧面腐蚀面,并使孔圆度有所增加,同时提高了加工过程的稳定性,但过大的涂覆厚度易出现打火甚至加工短路。

关 键 词：electrochemical cutting electric insulating coatings STABILITY electrochemical drilling（ECD） 

分 类 号：TG662[金属学及工艺—金属切削加工及机床]