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我厂自1965年以来采用电磁无心卡具,先后沿用了中心单磁极励磁结构、同心双磁极励磁结构的电磁无心卡具,发现都有一定的缺点。例如,中心单磁极励磁结构,由于磁力较弱,不能满足较大的粗磨留量的加工要求,在粗磨3516轴承内圈时,就难以胜任,此外,电磁线圈的防潮性能和供电方式也存在着一定缺点。同心双磁极励磁结构,虽然磁力比中心单磁极励磁结构有所增强,但是结构较为复杂,而且磁极部分难以淬火,加工制造较为困难。 我们遵循伟大领袖毛主席关于“人类总得不断地总结经验,有所发现,有所发明,有所创造,有所前进”的教导,几年来在生产实践的基础上,经过反复研究,于1971年制成复极励磁结构的电磁无心卡具（图1）。
Since 1965, our factory has adopted electromagnetic unintentional jig, has followed the central single-pole excitation structure, the electromagnetic unintentional jig with concentric double-pole excitation structure, and found that there are some shortcomings. For example, the central single-pole excitation structure, due to weak magnetic force, can not meet the larger coarse grinding capacity of the machining requirements, coarse grinding 3516 bearing inner ring, it is difficult to perform, in addition, the electromagnetic coil moisture resistance and power supply There are some shortcomings. Concentric double-pole excitation structure, although the magnetic field than the central single-pole excitation structure has been enhanced, but the structure is more complicated, and difficult to quench the magnetic pole part, manufacturing more difficult. We have followed the teachings of Chairman Mao, the great leader, that “mankind should constantly sum up experience, discover something, invent something, create something, and make progress.” In the past few years, on the basis of production practice, after repeated studies, in 1971 Made of repolarization excitation electromagnetic centerless fixture (Figure 1).