Research On Process Of Ultrasonic Assisted Magnetic Abrasive Finishing Of Titanium Alloy

Titanium alloy materials have a wide range of applications and development prospects in many fields such as industry and biomedical care due to their excellent performance.However,titanium alloy are typically difficult-to-machine materials,the traditional processing methods are difficult to meet the requirements of titanium alloy materials for finishing.Because of some advantages in improving surface quality and efficiency,ultrasonic-assisted magnetic abrasive finishing is considered to be one of the most important methods to finish titanium alloy.In this thesis,the processing technologies of ultrasonic-assisted magnetic abrasive finishing are researched.By analyzing the reaction principle of acid chemical composite plating technology,the preparation process of magnetic abrasive is developed.Ultrasonic-assisted magnetic abrasive finishing experiments on titanium alloys were performed to analyze the influence of various process parameters on the processing quality and efficiency,and the process parameters were optimized.The main research contents and results are as follows:(1)By analyzing the principle of acid-electroless chemical composite plating and its reaction system,the material of the abrasive grain phase and the formulation of the components of the bath were determined,and the preparation process of the magnetic abrasive was formulated.Moreover,the appearance quality and service life of the magnetic abrasive are analyzed,and it is verified that the ferritic magnetic abrasive materials prepared by this preparation process can meet the requirements of optical finishing.(2)The process rule of ultrasonic auxiliary magnetic abrasive finishing for titanium alloy was studied,and the process rules of surface roughness and material removal rate were analyzed,the results show that:The increase of abrasive particle size will increase the minimum surface roughness and material removal rate after machining;The increase of ultrasonic amplitude can reduce the surface roughness of the workpiece and improve the removal rate;Extended processing time will reduce the surface roughness and material removal rate of the workpiece after machining;The increase of spindle speed and machining clearance will reduce the surface roughness after the workpiece is processed,and the material removal will be reduced after the first increase.(3)Based on the surface roughness and material removal rate,the process parameters were optimized by the method of SNR and grey relational degree,the results show that:When the surface roughness is the process index,the optimal process parameters are combined into the abrasive particle size 50 mesh,the ultrasonic amplitude of 14?m,the spindle speed 1000r/min,the processing time of 30min and the processing gap 1.00mm,the surface roughness value of the workpiece is reduced to 0.08?m;With the material removal rate as the index,the optimal process parameters were combined into the abrasive particle size 50,the ultrasonic amplitude of 14?m,the spindle speed of 1200r/min,the processing time of 20min and the processing interval of 1.25mm,the removal rate of the material reached the highest level of 30.5mg/h;When considering the surface roughness and material removal rate,the optimal process parameter combination is the ultrasonic amplitude of 14?m,processing time 20min,machining clearance 1.00mm,spindle speed 1200r/min and abrasive particle size 50.