Study On Properties Of Current Distirbution Along Micro-profile In Processing Of Electrochemical Finishing

Electrochemical finishing is unconventional finishing method based onelectrochemical anodic dissolution. Compared with other processing techniques,Itsadvantages not only reflected in improving the surface quality of parts, but alsosharpen the anodic surface micro-profile.Research shows that: finishing effect ofelectrochemical finishing results from the integrated impacts, such as flow field andtemperature field etc. wherein,inter-electrode clearance is one of the most importantparameter. The inter-electrode clearance belongs to the category of medium scale dueto machining gap control about0.1~0.5mm.Meanwhile, along with theminiaturization of inter-electrode clearance some negligible factors in the macro scalebecome significant in the medium scale. Therefore, effects of the velocity distributionand pressure distribution of the electrolyte, especially anodic surface micro-profile onthe characteristics of flow field between the electrodes in electrochemical finishingare not negligible. At present, there is lack of research in inter-electrode flow fieldcharacteristics both in domestic and foreign.This paper analyzed the character of inter-electrode gap flow field and anodicsurface micro-profile in electrochemical finishing. with current research status ofresearch on gas, liquid two-phase both in domestic and foreign, the research thoughtof electrolyte flow field between electrodes is put forward.. Established the model testplatform based on the similarity principle of fluid mechanics. The effects of bubble,electrolyte entrance, and different anodic surface micro-profile on the flow field areinvestigated with CCD camera. Effects of different roughness on flow characteristicsare discussed.Experiment results show that, electrolyte Flow field between electrodes inmedium scale, then, is two-phase flow. The scale features of electrolytic products isthe Minimal level, therefore the electrolytic products effects on flow field isnegligible. Among them, distribution of hydrogen bubbles, the porosity, and the shape has a certain effect on the flow field. Electrode current field and flow field dointeract and interplay with each other. During the electrochemical finishing process,the anode surface roughness has a different influence on inter-electrode flow field.The smoother the anode surface is， the more uniform the flow field distributionwould be。Besides, more quantity of anode would be removed with a smooth anodesurface which is good for the leveling. The distribution of porosity and the bubble inthe two-phase flow between the bipolar plate has some volatility， which are thekey factors influencing the current density. So the gas phases that influence theinter-electrode flow field should not be ignored. The experimental results showedthat the electrochemical mechanical composite finishing method for pipe isdesirable. practical value and wide application.