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长沙有色金属加工厂原拉伸、挤压模具液体渗碳工艺是一种较为陈旧的方法,如能采用氮化技术,则在氮化时,表层的残余压应力大于普通渗碳层,因而氮化层的疲劳极限(σ_(-1))高于渗碳层;同时,氮化时所获得的硬度(H_(RC)=70～86)也超过渗碳时所得到的硬度(H_(RC)=66);另外,在相对件高速运动缺乏润滑的条件下,氮化件具有高的抗“咬卡”性能,因此该厂决定改革原拉伸、挤压模具液体渗碳工艺,代之以辉光离子氮化技术。
Changsha non-ferrous metal processing plant stretching, extrusion die liquid carburizing process is a relatively old method, such as the use of nitriding technology, then nitriding, surface residual compressive stress is greater than the ordinary carburized layer, so nitrogen The fatigue limit (σ _ (- 1)) of the layer is higher than that of the carburized layer. Meanwhile, the hardness (H_ (RC) ) = 66). In addition, the nitride part has a high resistance to “snap-in” performance under the condition of lack of lubrication at high-speed relative movement. Therefore, the plant decided to reform the original drawing and extrusion mold liquid carburizing process, Glow ion nitriding technology.