我厂今年生产CS-6009支承板专用拉床时,有一根丝杆(图1)长3980毫米,需进行软氮化处理,材料为38 CrMoAlA。可是我厂现有最大氮化炉是RJJ-70-9气体渗碳炉改装的,马弗罐尺寸为φ600×2600毫米,有效长度为2200毫米左右,这台炉子也是我市最深的氮化炉。面对工件长、炉子小、时间紧的情况,只有立足本厂现有设备来解决。我们分析了氮化过程中氨气分解的情况后,决定采用调头氮化的工艺,在原有设备上解决了这一难题。 I plant this year to produce CS-6009 support plate special broaching machine, there is a screw (Figure 1) 3980 mm long, the need for soft nitriding, the material is 38 CrMoAlA. However, our largest existing nitriding furnace is RJJ-70-9 gas carburizing furnace modified, muffle size φ600 × 2600 mm, the effective length of about 2200 mm, this stove is the city’s deepest nitriding furnace . The face of the workpiece length, small stove, the time is tight, only based on existing plant equipment to solve. After analyzing the decomposition of ammonia in the nitriding process, we decided to adopt the process of turn-on-nitriding to solve this problem on the original equipment.