Fundamental Research Of Application On Electrochemical Finishing Technology

Electrochemical Finishing(ECF) not only improve the quality of parts surface processinggreatly, but also improve the machining precision of parts inordinately, at present in the fieldof mechanical parts processing to get rapid development and extensive application.The using performance of parts depend on the processing quality. As the one ofprocessing quality main content, the surface quality has important influence on usingperformance. Therefore, improve the surface quality of parts, ensure the integrity of thesurface layer, is great significance to improve the use performance of components.A lot of studies show that under the condition of small gap the influence factors of ECFprocessing is more complex, the cathode surface micro contour is a factor to effect the anodicdissolution that cannot be ignored. In ECF process, the tool cathode have certain extentsurface micro geometry too or a certain surface roughness as the anode, which affected thecurrent field distribution characteristic in some extent. Current field distribution characteristicis one of the main factors on leveling effect and surface quality, and actually the cathodesurface microcosmic profile in the whole process, by changing the current field pointscharacteristic and affect the surface quality of the final parts. Leveling effect such changesover time leading to anode on the surface of the in homogeneity of electric field distribution.To improve the leveling effect of moving ECF, according to the actual work of anodicand cathode surface micro-profile, based on the electrodynamics knowledge,established themathematical model of current field. On the basis of this use of related software simulationand numerical calculation is carried out, obtained for different tool cathodic surface contourof the current field distribution influence rule, As well as to the different test parameterswithin the scope of stationary and movable ECF processing relatively comparative analysisbetween leveling effect, Discuss the importance of the tool cathode electrochemical finishingprocess and discuss the mobile leveling mechanism.According to the experiments, a “peak” shape of the cathode surface is less effective than that of a “planet” shape to improve the effect of the anode levelling. existence ofrelative motion between the electrodes is helpful for improving the finishing effec, it also canimprove the distribution of the current field, it not only improves the surface quality, makingthe surface roughness “Ra” value greatly decreased, but also helps to correct or homogenizingerror which can obviously improve the machining accuracy of workpiece. In the moving ECFexperiment, improving voltage within a certain scope is good for electrochemical anodicdissolution. In electric field theory, the improvement of voltage makes the charge moreconcentrated in the”peak” of the anode surface where power distribution and current densityare more dense, leading to the higher removing capacity, this can improve the effect of theleveling to a certain extent. However, increasing the movement speed doesn’t always meanimproving the leveling effect, because that under the fast movement speed, electrolyticproduct is not easy to be out in time which makes the electrolyte unable to fully update,furthermore, the heat generated in the machining processing can not be discharged out in timewhile in a faster moving speed which can’t meet the cooling requirements during theprocessing.