Research On Surface Quality Of Ultrasonic Compositing Magnetic Grinding Ceramic Cylinder

In view of the precision machining ceramics cylindrical roller,this paper researches the surface quality of ceramic cylinder by using ultrasonic composites magnetic machining technology.The research content is as follows:Mechanism of ultrasonic composites magnetic grinding ceramics cylinder is researched based on the theory of ultrasonic machining and the magnetic grinding mechanism.Force analysis model of magnetic abrasive is established and force analysis of single grit is studied.The structure of grinding head is designed and the magnetic field simulation of grinding head is done by using of ANSYS Workbench and the optimal arrangement of N-S-N is concluded.The simulation result is verified by measuring the magnetic field intensity of grinding head.Ultrasonic amplitude transformer is designed based on the amplitude transformer design theory.Resonance frequency of acoustic system and amplitude frequency characteristics of circular arc surface are concluded based on modal analysis and harmonic response analysis.The displacement response under resonant frequency of the grinding head assembly is simulated by harmonic response analysis.Based on measuring resonant frequency and measuring amplitude,three kinds of acoustic system are 20.3 kHz?27.4 kHz?34.8 kHz and maximum amplitude of corresponding grinding head are 10.7?m?8 ?m?8.5 ?m.The comparison of displacement simulation of arc surface with the actual measurement results indicates that actual measurement verifies the validity of the simulation.In addition,effect of arc end face angle of the grinding on resonance frequency of acoustic system is studied.Effect of the threaded hole location and the grinding head length on system resonance frequency and dynamic resistance is studied.Effect of different abrasive ratio on the surface roughness is studied and the optimal abrasive ratio is given.Orthogonal experimental design is done for magnetic grinding and ultrasonic composites magnetic.The surface roughness and change rate of surface roughness are analyzed and the optimal experimental parameters are obtained.Effect of workpiece speed? abrasive particle size?machining gap?ultrasonic frequency on the surface roughness and change rate of surface roughness is studied.