我国现行使用的Ｍ71 30、Ｍ7454、Ｍ741 0 0等平面磨床的充退磁系统普遍不理想 ,尤其是加工合金材料和经过热处理的材料更为明显 ,主要表现在 :1 .不退磁或退磁不净 ,取工件费力 ,有些须用插、撬方能取下 ,工作效率低 ,劳动强度大 ,生产成本高。 2 .相当一部分是手动退磁 ,多一 China’s current use of M71 30, M7454, M741 0 0 and other surface grinder charge demagnetization system generally unsatisfactory, especially the processing of alloy materials and heat-treated material is more obvious, mainly in: 1. Non-demagnetization or demagnetization is not net, Take the workpiece laborious, some must be inserted, pry square to remove, low efficiency, labor-intensive, high production costs. A considerable part of the manual demagnetization, one more