Research On The Manufacturing Of Micro-pits By Electrolyte Jet Machining

Surface topography has great influence on the friction and wear behavior of tribopairs. It has been proved that the texture of micro-pits array play an important role in improving the lubrication situation and reducing friction and wear. electrochemical machining (ECM) has been paid much attention to machine the micro-pits because it has many advantages such as high efficiency, low cost, without cutting force Compared to other processing methods.Electrolyte jet machining(EJM) is one method of ECM.,in which the electrolytic current is supplied between the anodic workpiece and the cathodic nozzle via the electrolyte which is ejected from the minute nozzle. Only the workpiece material exposed to the jet is removed due to the anodic dissolution, because the electrolytic current is restricted to the limited area by the jet. Also, electrolyte jet machining is advantageous for micro machining because of its atomic processing unit. The micro-pits array was machined by EJM in this thesis and the Main work has been finished as follows:(1) The finite element analysis is used to study the current density of processed zone of workpiece surface in the machining of micro-pits by the capillary electrodes electrolyte jet machining. The result shows that this method is fit for processing the hemispherical micro-pits.(2) The processing system of capillary electrodes electrolyte jet machining micro-pits is constructed. The effect of process parameters, such as applied voltage, electrolyte concentration, process time, and inlet electrolyte pressure, on the profile of single pit. and the influence of capillary spacing, electrolyte pressure and processing space on the profile of micro-pits array was investigated.(3) The EJM without moving of the electrolyte flow using a capillary tubing electrode is proposed. The current density distribution over the workpiece surface is analyzed by finite element method, and the effect of process parameters, such as applied voltage, electrolyte concentration, process time, on pit profile was examined.(4) Micro-pits with the diameter of 30μm, the depth of about 10μm are obtained in the experiment.