摘要
为揭示电解加工表面成形规律,建立电-磁-热-流多场耦合微观材料模型,从电流密度分布、粗糙度、微观形貌等几个方面,动态跟踪阳极微观表面成形过程,揭示Ti-48Al-2Cr-2Nb合金在不同磁场条件下,电解加工微观表面的动态演变规律及影响机制,并通过实验验证仿真结果。仿真结果表明:电解加工微观表面成形是一个表面膜生成与溶解的复杂竞争过程,在加工过程中,微观表面反复经历粗化与抛光阶段。无磁场作用时,表面粗糙度为0.121μm,多重分形谱的谱面积为0.0030;有磁场作用时,表面粗糙度为0.118μm,谱面积为0.0023。实验结果证实:无磁场时,表面粗糙度为1.16μm,多重分形谱的谱宽为0.87,谱面积为1.468;有磁场时,表面粗糙度为0.93μm,谱宽为0.84,谱面积为1.388。仿真结果与实验结果吻合,磁场降低了加工表面粗糙度,使表面微观形貌变简单、均匀,同时提高了加工稳定性。
To reveal the surface forming law of electrochemical machining(ECM),an electric-magnetic-heat-flow multi-physical field coupling micro-material simulation model was established to dynamically track the forming process of anode micro surface from several aspects,such as current density distribution,roughness and micro-morphology.The dynamic evolution law and influencing mechanism of Ti-48Al-2Cr-2Nb alloy under different magnetic field conditions were revealed,and the simulation results were verified by electrochemical machining experiments.The simulation show that the forming of ECM surface is a complex competitive process of the formation and dissolution of surface film,and the micro-surface repeatedly goes through coarsening and polishing stages during the machining process.Surface roughness is 0.121μm and spectrum area of multifractal spectrum is 0.0030 without magnetic field,while the surface roughness is 0.118μm and the spectrum area is 0.0023 with magnetic field.The experimental results of ECM confirm that the surface roughness is 1.16μm,the spectrum width of multifractal spectrum is 0.87 and the spectrum area is 1.468 without magnetic field,while the surface roughness is 0.93μm,the spectrum width is 0.84 and the spectrum area is 1.388 with magnetic field.The simulation results agree well with the experimental results,the magnetic field reduces the machined surface roughness,makes the microstructure simpler and more uniform,and improves processing stability.
作者
隋浩男
林荣联
马新周
胡纯蓉
廖翠姣
SUI Haonan;LIN Ronglian;MA Xinzhou;HU Chunrong;LIAO Cuijiao(College of Mechanical Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China)
出处
《包装学报》
2023年第2期59-68,77,共11页
Packaging Journal
基金
国家自然科学基金资助项目(22072040)
湖南省自然科学基金资助项目(2020JJ4271)
湖南省教育厅科学研究基金资助项目(21C0406)。
