目的 设计一种低频交变磁场发生装置，高效率地去除H62黄铜管内的表面缺陷，提高其表面质量，延长其使用寿命。方法 采用闭合铁芯的方式设计一种低频磁场发生装置，利用EDEM软件对磁场中的磁性磨粒进行运动仿真分析;对电磁线圈的缠绕方式、通电方式进行设计，并利用Ansys软件对不同的线圈缠绕方式和通电方式所产生的磁场进行模拟分析。数控车床夹持管件旋转，并与磁场发生装置相配合，使管件中的磁性磨粒在磁场中磁化，并紧贴管件内表面进行研磨抛光。使用触针式表面粗糙度测量仪和超景深 3D电子显微镜，对研磨前后的样品进行检测分析。结果 基于三端缠绕方式，采用2种不同的通电方式对管件进行研磨加工，采用相对型通电方式研磨6 min后，H62黄铜管内的表面粗糙度由原始的0.618 μm降至0.373 μm。采用相邻型通电方式研磨6 min后，H62黄铜管内的表面粗糙度由原始的0.667 μm降至0.081 μm。结论 利用低频交变磁场能够实现研磨工具(磁性磨粒)的循环更新，提高磁性磨粒的利用率。在采用三端缠绕方式通电时所产生的磁场强度更大，更适合于磁粒研磨加工。采用相邻型通电方式(N?N?S?S磁极排布)加工时，研磨压力更大，大幅缩短了加工时间，去除了管件内壁的原始缺陷。

The work aims to design a low-frequency alternating magnetic field generator to remove the inner surface defects of H62 brass tube with high efficiency, so as to improve its surface quality and prolong its service life. A low-frequency magnetic field generator was designed with closed iron core. EDEM software was used to simulate the motion of magnetic abrasive particles in the magnetic field. The magnetic field generated under different winding modes and energization modes were simulated and analyzed with Ansys software. The pipe fitting was clamped and rotated by the NC lathe in combination with the magnetic field generator. The magnetic abrasive particles in the pipe fitting were magnetized in the magnetic field and close to the inner surface of the pipe fitting for grinding and polishing. The test samples before and after grinding were detected and analyzed by stylus surface roughness measuring instrument and super depth of field 3D electron microscope. Based on the three end winding mode, two different energization modes were used to grind the pipe fittings. After grinding for 6 min by the relative energization mode, the roughness of the inner surface of H62 brass tube changed from the original Ra 0.618 μm down to Ra 0.373 μm. After grinding for 6 minutes by the adjacent energization mode, the roughness of the inner surface of H62 brass tube changed from the original Ra 0.667 μm after down to Ra 0.081 μm. The use of low-frequency alternating magnetic field can realize the cyclic renewal of grinding tools (magnetic abrasive particles) and improve the utilization rate of magnetic abrasive particles. When the iron core is energized by three end winding, the magnetic field generated by the electromagnetic device is stronger and more suitable for magnetic abrasive finishing. When the adjacent energization mode (N-N-S-S magnetic pole arrangement) is adopted, the grinding pressure is larger. It greatly shortens the processing time and removes the original defects on the inner wall of the pipe fittings.