Mechanism Analysis of Electrochemical Micro-machining Behavior Assisted by Magnetic Field with Local Magnetic Induction Lines Deformation
Mechanism Analysis of Electrochemical Micro-machining Behavior Assisted by Magnetic Field with Local Magnetic Induction Lines Deformation
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DOI：
10.1007/s11837-023-05798-3
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发表时间：
2023-04
期刊：
影响因子：
2.6
通讯作者：
G. Pang;X. Cao;Jingang Zhang;Sifan Wang;Ben Lin;Mingying Li;Manfu Wang;Zhi-Li Zhang
中科院分区：
文献类型：
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作者：
G. Pang;X. Cao;Jingang Zhang;Sifan Wang;Ben Lin;Mingying Li;Manfu Wang;Zhi-Li Zhang
采用电化学微细加工技术，在磁场辅助和非磁场辅助条件下，对404 C不锈钢进行了高精度加工。利用扫描电子显微镜检测了表面粗糙度分布，并对其微观形貌进行了分析。与传统的微细电解加工相比，通过在加工间隙正下方引入一个北极磁体，提高了加工效率和最终表面质量。然而，当双磁铁与相反的北极-北极对齐，加工时间的表面粗糙度的变化几乎是一致的磁场自由的情况下。阐述了磁场对微细电解加工的影响机理。磁场辅助的优点是产生磁流体动力学对流，促进质量传递，加速阳极溶解。由于磁极间的斥力使加工间隙中的磁感应线发生严重变形，削弱了磁流体动力学，增强了梯度磁力，削弱了传质，抑制了阳极溶解。在磁场辅助微细电解加工过程中，磁流体动力和梯度磁场力会影响加工效果，应注意磁感线的变形。
Grade 404C stainless steel was prepared with high precision by electrochemical micro-machining with or without magnetic field assistance. The surface roughness distributions were detected and their micro-morphologies were analyzed by scanning electron microscopy. Compared with traditional electrochemical micro-machining, the processing efficiency and final surface quality were improved by introducing an external magnet with the north pole directly under the machining gap. However, when dual magnets with the alignment of opposite north–north poles were employed, the variation of surface roughness with processing time was almost consistent with the magnetic field-free case. The mechanism of the effect of magnetic field on electrochemical micro-machining was elaborated. The advantage of magnetic field assistance was the generation of magnetohydrodynamic convection, which facilitated mass transport and accelerated anodic dissolution. Due to the magnetic induction lines in the machining gap being heavily deformed by the repulsion between the magnetic poles, the magnetohydrodynamic force was impaired and the gradient magnetic force was enhanced, which weakened the mass transfer and inhibited the anodic dissolution. In the process of magnetic field assistance electrochemical micro-machining, the magnetohydrodynamic force and the gradient magnetic force will affect the processing effect and enough attention should be paid to the deformation of the magnetic induction lines.