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在磁力研磨加工中,磁极结构形状和参数是影响其加工效率的主要因素之一。本文以XK7136C数控铣床为加工平台,将主轴头头部更换为永磁研磨磁极,对磁极结构形状和参数进行研究。设计符合加工使用的两种不同形状的磁极,利用Ansys仿真软件对其磁场进行有限元分析。通过仿真分析及试验验证发现,两种不同形状的磁极与普通磁极相比都能提高磁力光整加工的效率,同时开槽后的锥形磁极比球形磁极的端面在磁力线分布上更加密集,聚磁能力更好。试验研究发现,镍基高温合金Inconel 718的表面粗糙度在21分钟内由Ra0.502μm下降到Ra0.059μm,表面显微硬度和残余应力也有所改善,设计的磁极结构参数更有利于磁力光整加工。
In magnetic grinding, the shape and parameters of the magnetic pole structure is one of the main factors that affect the processing efficiency. In this paper, XK7136C CNC milling machine as the processing platform, the head of the spindle head replaced by permanent magnet grinding pole, the pole shape and parameters of the study. Two poles of different shapes are designed and machined to be used for the finite element analysis of the magnetic field with Ansys simulation software. Through the simulation analysis and experimental verification, it is found that the magnetic poles of two different shapes can improve the efficiency of magnetic finishing compared with the ordinary magnetic poles. Meanwhile, the tapered magnetic poles of the slotted poles are more densely distributed than the magnetic poles of the spherical magnetic poles. Magnetic ability is better. The experimental results show that the surface roughness of Inconel 718 is reduced from Ra0.502μm to Ra0.059μm in 21 minutes, and the surface microhardness and residual stress are also improved. The designed magnetic pole structure parameters are more conducive to the magnetic finishing Processing.