阴极侧壁绝缘对微孔电化学加工精度的影响(英文)

Effect of Tool Electrode Insulation on Electrochemical Micro Drilling Accuracy

在微孔电化学加工中,阴极侧壁区域的工件阳极溶解极易导致加工锥度的产生.为了提高阳极溶解的定域性,采用阴极侧壁绝缘电极进行微孔电化学加工的实验研究.采用直径80～100μm的侧壁绝缘阴极,在0.5mm厚度的不锈钢板(1Cr18Ni9Ti)上加工出一系列微孔.结果表明,阴极侧壁绝缘可以很好地减少加工锥度,从而提高微孔电化学加工精度.此外,减小脉冲宽度及加工电流密度、降低电解液浓度也有益于加工精度的改善.

Generation of taper angle is a major problem in electrochemical micro drilling process because of anode dissolution in the area of tool＇s side wall. The electrochemical micro machining by insulated tool electrode was experimentally studied in order to localize the anode dissolution area. A series of micro holes was drilled on stainless steel material （1Crl8 Ni9Ti）plate with a thickness of 0.5 mm to investigate the effects of the tool insulation. Insulated tools with diameters range from 80 μm to 100 μm were employed in the experiment. Taper shape of the hole can be effectively prevented by utilizing the presented method. In addition, shorter pulse on-time, lower current density and lower electrolyte concentration lead to higher machining accuracy.