Experimental Research of Electrofinishing Processing of High Precision Parts as a Composition of Convergence Technology

The subject of this study is the convergence technology of finishing processing of high-precision parts. A comparative analysis of known methods of parts finishing processing used in the production of hydraulic, pneumatic aerospace and other transport assembly components according to literature sources has been performed. It has been shown that there are the prospects for further research of methods for creating a integrated convergence technology. Experimental studies have been performed on some samples made of steel 20 with a diameter of 20 mm by the electrosuperfinish scheme. It has been found that in the processing zone a decrease in roughness has occurred from a value of Ra 5.0 to Ra less than 2.0, due to concentration of current density and pulse action on the material with a frequency of 500 Hz – thus, productivity increase is 1.75 compared to the sample under the same conditions in a stationary electrolyte. The experiment has demonstrated either that the proposed method gives opportunity to interrupt the processing, over a wide range of time, which in turn affords regulating the indicators of geometric accuracy both of the part diameter and surface roughness. The analysis of experimental data allows us to conclude about the adequacy of the accepted theory as to the concept of finishing technology for high-precision parts. The scheme of concentration (focusing) of the current flow and the mode for electrosuperfinishing due to the movement of the electrode relative to the part surface has been tested, which resulted in achieving the effect of surfaces polishing and oxidation products removing. It has been shown in this study the further prospects of research in the field of convergence technology of high-precision parts finishing processing, which ensure the geometric accuracy of micro- and nano-precision parts, precision processing of shafts and small-diameter holes, and increasing the processing accuracy up to 0.001 mm.