在我厂开始试验电接触表面淬火是用手动的方式,淬火介质采用硫酸亚铁在机床上导轨表面划出淬火痕迹(具体方法见附件),提高导轨表面硬度。当时采用硫酸亚铁作为淬硬剂有这样一个设想:一方面作为淬火剂提高导轨表面的硬度,另一方面这种淬火剂能否在淬火的过程中在导轨表面层形成一种具有高减磨性能的硫化物。如果硫能渗入,那么就可以大大地提高导轨的耐磨性能,就能一举两得。毛主席教导我们:“判定 At the beginning of the test, the electrical contact surface quenching at our factory was performed by hand. Quenching media used ferrous sulfate to draw quenching marks on the surface of the guide rails on the machine tool (see the annex for specific methods) to increase the surface hardness of the guide rails. At that time, the use of ferrous sulfate as a hardener had an assumption that, on the one hand, it was used as a quencher to increase the hardness of the rail surface, and on the other hand, whether the quencher could form a kind of high anti-friction on the surface layer of the rail during quenching. Performance of sulphides. If sulfur can infiltrate, then the wear resistance of the guide rails can be greatly improved and both can be achieved. Chairman Mao taught us: "Judgement