Study On Electrolysis And Magnetic Particle Composite Grinding Technology For Additive Manufacturing Of Complex Surface

As a new processing technology,additive manufacturing technology,compared with other processing and manufacturing technologies,has the characteristics of free creation of complex shapes,short manufacturing cycle and low cost,which is widely used in aerospace,medical and other fields.In the actual production,improving the quality of metal powder,optimizing the powder path and improving the process parameters can improve the surface quality of additive manufacturing parts,but it can not completely solve the problem of poor surface quality of parts,which seriously affects the performance of additive manufacturing parts.Therefore,it is urgent to reduce the surface roughness of additive manufacturing parts and improve the surface quality and service performance of parts It is one of the most important problems to solve.At present,electrochemical technology,abrasive flow technology and shot peening technology are the main technologies to improve the surface quality of additive manufacturing parts,but most of them have the problems of difficult polishing and low processing efficiency.As a new technology,magnetic abrasive finishing technology has been widely used in the precision polishing of various complex parts,and good grinding effect has been recognized by major enterprises.In this paper,the magnetic abrasive polishing technology is applied to the complex surface finishing of additive manufacturing parts.The composite grinding method of electrolysis and magnetic abrasive is adopted.Firstly,the passive film with hardness lower than the substrate is formed on the surface of parts by electrolysis,and then the passive film is removed by magnetic abrasive polishing,so as to improve the grinding efficiency.In order to solve the problem of surface finishing of parts made by additive manufacturing,this paper takes the parts made of Ti6Al4V titanium alloy by additive manufacturing technology as the research object.Based on the magnetic abrasive polishing technology and the forming mechanism of passive film on the material surface,the influence of electrolytic parameters on the thickness of passive film was studied,Na NO₃was selected as the test electrolyte by comparing the use characteristics of different electrolytes;The complex surface of the added material parts was polished and ground by using the simulated combined magnetic pole.The change law of magnetic induction strength of the slotted,60°V-shaped groove,90°rectangular groove and 135°trapezoid groove was analyzed by numerical simulation,and the optimum slotting angle was obtained;Based on the response surface methodology,the relative degree of the parameters and the parameters was calculated quantitatively by comparing the temperature of electrolyte,the voltage of electrolysis,the number of magnetic abrasive particles and the speed of magnetic pole.Through research and analysis,when the electrolyte temperature is 30?,the electrolytic voltage is 10V,the rotating speed of magnetic pole is 1000r/min,and the mesh number of magnetic abrasive is 80 meshes,the grinding effect is the best.Compared with magnetic abrasive finishing,the surface of the work piece is uniform and smooth,the surface quality is significantly improved,and the surface roughness is significantly reduced,which effectively improves the machining efficiency.