高速齿轮轴失效原因分析

Failure Analysis of Gear Shaft

某减速器在正常运行6000h时齿轮轴由微振磨蚀产生表面损伤,造成应力集中,产生疲劳裂纹而发生正断型单向扭弯疲劳断裂。研究其失效原因,在进行材料、断裂轴断口的细化分析和加工工艺过程检验后,提出具体改过措施:尽可能加大齿轮轴轴承段的圆角过渡;提高冷加工质量,增加贴合面积及表面光洁度,减小初始裂纹出现的可能性和改进热处理工艺,提高热处理质量。经过改进,取得了良好使用效果。

The gear shaft of material 17CrNiMo6 in gear reducer occurs to fretting,stress concentration,fatigue cracking. fatigue breakage produces when the reducer operates 6000 hours. The breakage is normal fatigue breakage with unidirectinal bending and twisting moments. After the fatigue breakage causes are analysized,speafic improving measures are put forward. The good result is achieved.