目前对大部分精密齿轮生产,都倾向用各种加热或化学热处理的表面硬化方法。选择最合适的表面硬化处哩,不仅保证齿轮的固有特性,还保证产生的畸变最小。有些齿轮在最后工序中不可能采用磨削加工,因此,必要用不变形的表面硬化方法。满足以上要求的氮化工艺还未完全达到。我们知道在“典型的”氮化处理中,氮化表面层出现ε——相组织,它是一种高氮饱和的脆而弱的相,其浓度由氮化处理条件而定。由于它的存在,使表面造成削弱,一定程度 At present most of the precision gear production, tend to use a variety of heat or chemical heat treatment of the surface hardening method. Choose the most appropriate surface hardening of miles, not only to ensure the inherent characteristics of gears, but also to ensure that the resulting distortion is minimal. Some gears in the final process can not be used for grinding, it is necessary to use non-deforming surface hardening method. The nitriding process that meets the above requirements has not yet been fully achieved. We know that in the “typical” nitriding process, the nitrided surface layer shows ε-phase structure, which is a brittle and weak phase of high nitrogen saturation whose concentration depends on the nitriding conditions. Because of its existence, so that the surface caused by weakening, to some extent