Experimental Research On Pulse Gas Hammer Mask Electrochemical Machining Micro-pit Structure

During the operation of the motion mechanism,there are physical and energy losses due to friction.This not only reduces the energy utilization rate,but also reduces the service life of parts.Improving its friction performance is of great help in saving energy and reducing maintenance costs.Studies have shown that the surface pit structure with a certain size and distribution can store lubricating oil and effectively improve the friction performance of the sports pair.Therefore,looking for an efficient and convenient surface texture processing technology is the current research hotspot.Electrochemical machining has the advantages of high machining efficiency and good surface quality.Among them,mask electrochemical machining is widely used in the processing of metal surface microstructures.However,the problem of mask electrochemical machining that it is difficult to discharge the electrolysis products is easy to cause the accumulation of electrolysis products in the processing gap,thereby affecting the processing accuracy and efficiency.In response to the above problems,this subject firstly proposed the method of pulse gas hammer mask electrochemical machining,and carried out the technological research about electrochemical machining surface structure of micro-pits on the stainless steel.The work content mainly includes the following aspects:Firstly,the basic principle of pulse gas hammer mask electrochemical machining was expounded,and according to its technological characteristics and experimental research requirements,a pulse gas hammer mask electrochemical machining test system is built,including an electrochemical machining platform,a power supply of high-frequency pulse and a pulse gas control device.Secondly,using COMSOL Multiphysics 5.2 software to establish a gas-liquid twophase flow field simulation model,and the impact of pulse gas hammer on electrolyte flow changes was researched and analyzed.In addition,measuring the current changes during the machining process.Those are confirmed that the pulse gas hammer has the effect of promoting the discharge of electrolytic products in the machining gap.Thirdly,carrying out the experiments of passive pulse gas hammer mask electrochemical machining single micro-pit,and the influence of gas frequency,gas duty cycle,pulse voltage,pulse frequency,pulse duty cycle and other process parameters on the size and localization of micro-pit was researched and analyzed.Based on this,furtherly carrying out the experiments of active pulse gas hammer mask electrochemical machining and the influence of the two processes on the machining results was compared and analyzed.Fourthly,carrying out the experiment of pulse gas hammer mask electrochemical machining array micro-pits,and the influence of pulse gas parameters such as gas frequency and gas duty ratio on the processing results was researched and analyzed.Besides it is confirmed that the pulse gas hammer has a certain effect on improving the consistency of array micro-pits.