平磨后的工件应该退磁线切割加工多数都在平磨以后；按正常的工艺，平磨后应该退磁。但是在线切割加工时往往工件没有退磁。这样使线切割加工产生的电腐蚀颗粒吸附在割缝中；特别是当工件比较厚时，不退磁容易造成切割进给不均匀、加工表面粗糙度增大、短路、断丝等等现象... After grinding the workpiece should be demagnetized wire cutting most are in the mill after grinding; according to the normal process, after flat grinding should demagnetization. However, the workpiece is often not demagnetized during the cutting process. In this way, the electro-corrosive particles produced by the wire cutting process are absorbed in the kerf. Especially when the work piece is relatively thick, the non-demagnetization can easily lead to the uneven cutting feed, the roughness of the machined surface, short circuit, broken wire and the like. .