To improve the surface quality of TC4 alloy prepared by selective laser melting,the ultrasonic assisted magnetic abrasive finishing technology for polishing was adopted.Simulated the size and distribution of magnetic flux density under different magnetic pole dimensions and finishing areas.The cavitation bubble in the composite field force was analysed,the magnetic field on the cavitation effect on the influence mechanism was studied.The changes in surface morphology of the specimen before and after applying ultrasonic vibration were analyzed.The influence of amplitude,finishing rotate speed and finishing time on surface roughness were studied.The results show that as the diameter and height of the magnetic poles increase,the magnetic induction intensity increases and the distribution of magnetic flux density gradually changes from uneven to uniform.The finishing effect is better at the position of 80 mm,with an average magnetic field force of 17.12 mN and a surface roughness of 0.673 μm.After applying ultrasonic vibration,the original surface bumps and defects are completely removed,the surface exhibites fine scratches and the surface roughness is reduced to 0.243 μm.Compared with the magnetic abrasive finishing process,the surface roughness is reduced by 60%.The suppression effect of the magnetic field on the cavitation effect reduces the energy released when the cavitation bubble collap-ses, thus reducing the damage caused by the cavitation effect on the surface.
NguyenH D, PramanikA, BasakA K,et al.A critical review on additive manufacturing of Ti-6Al-4V alloy:microstructure and mechanical properties[J].Journal of Materials Research and Techno-logy,2022,18:4641-4661.
HuangX, LiuH, WangZ N,et al.Effect of surface oxidation on wear and tribocorrosion behavior of forged and selective laser melting-based TC4 alloys[J].Tribology International,2022,174:107780.
ZhangJ, ChaudhariA, WangH.Surface quality and material removal in magnetic abrasive finis-hing of selective laser melted 316L stainless steel[J].Journal of Manufacturing Processes,2019,45(7):710-719.
[11]
VahdatiM, RasouliS A.Study of magnetic abrasive finishing on freeform surface[J].Transactions of the IMF,2016,94(6):294-302.
NingF D, CongW L.Ultrasonic vibration-assisted (UV-A) manufacturing processes:state of the art and future perspectives[J].Journal of Manufactu-ring Processes,2020,51(1):174-190.
[16]
YoshimuraT, WatanabeS, IjiriM,et al.Development of processing technology using extremely high concentration cavitation energy by strong magnetic field[J].Results in Materials,2022,14:100289.
[17]
LeenovD, KolinA.Theory of electromagnetophoresis.I.magnetohydrodynamic forces experienced by spherical and symmetrically oriented cylindrical particles[J].The Journal of Chemical Physics,1954,22(4):683-688.
[18]
DelnoijE, LammersF A, KuipersJ A M,et al.Dynamic simulation of dispersed gas-liquid two-phase flow using a discrete bubble model[J].Chemical Engineering Science,1997,52(9):1429-1458.
[19]
HojjatzadehS M H, ParabN D, YanW T,et al.Pore elimination mechanisms during 3D printing of metals[J].Nature Communications,2019,10(1):3088.
[20]
符卫春.基于谱分析方法的超声空化特征实验研究[D].西安:陕西师范大学,2008.
[21]
LiB B, ZhangH C, LuJ,et al.Experimental investigation of the effect of ambient pressure on laser-induced bubble dynamics[J].Optics & Laser Technology,2011,43(8):1499-1503.