Based on the interpolation motion control of numerical control machine, some experiments were conducted on the reflecting cover of lamp mold core with the magnetic abrasive finishing. On the premise of ensuring the precision of shape and dimension, the surface roughness with original Ra 0.065 |xm reduced to Ra 0. 035 μm was obtained. The influences of machining gap, poles speed, machining time and feed on the surface roughness were analyzed by the single element method. It is proved that magnetic grinding method can be used for surface finishing of reflecting cover of lamp mold core. Good surface quality can be obtained by choosing appropriate processing parameters, such as the working gap about 1.5 mm , the rotational-speed of magnetic pole 300 ~600 r/min, the processing time about 8 min and the workpiece feeding 120 ~300 mm/min.%基于数控机床的插补运动控制采用磁性研磨方法进行了灯具罩模芯反射块表面的研磨加工,在保证形状精度和尺寸精度的前提下,加工表面粗糙度Ra由原始的0.065μm降低到0.035μm.采用单因素实验方法分析了几种主要加工参数,包括加工间隙、磁极转速、加工时间和工件进给量对灯罩模芯表面粗糙度的影响.验证了磁性研磨方法可以用于模芯表面数量多、尺寸小的反射块表面加工,并且选择合适的加工参数能够获得较好的加工表面质量,如加工间隙在1.5 mm左右、磁极转速300～600r/min、加工时间8 min左右、工件进给量120～300mm/min.
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