CAJ | 학술논문

卷筒小行星齿轮在运转中发生异常断齿。为了查明断裂原因，运用宏观及微观分析方法，对断裂齿轮进行了分析。结果表明：齿轮断裂为多源疲劳断裂，且多数未断齿根部位亦发现裂纹；齿轮基材存在贝氏体及铁素体组织，说明淬火时冷却速度不足；表面淬火也不均匀。这些工艺问题导致齿轮综合机械性能下降。在循环工作应力及应力集中作用下，齿根部位产生多处疲劳裂纹源，并不断扩展，最终导致齿轮断裂失效。
권통소행성치륜재운전중발생이상단치。위료사명단렬원인，운용굉관급미관분석방법，대단렬치륜진행료분석。결과표명：치륜단렬위다원피로단렬，차다수미단치근부위역발현렬문；치륜기재존재패씨체급철소체조직，설명쉬화시냉각속도불족；표면쉬화야불균균。저사공예문제도치치륜종합궤계성능하강。재순배공작응력급응력집중작용하，치근부위산생다처피로렬문원，병불단확전，최종도치치륜단렬실효。
A tooth of reel asteroid gear fractured abnormally during operation. In order to find out how it occurred ,fracture of the gear were analysed by macroscopical observation and microscopical examination. The results showed that the gear failure was multiple origins fatigue fracture ,and cracks were also found at the dedendum of most other teeth of the gear. There were bainite and ferrite in gear base material , which showed the quenching cooling rate was too slow. Surface quenching was uneven. All of these problems lead to the decrease of the gear comprehensive mechanical properties. Some fatigue crack origins occured at the dedendum of teeth under the circulation work stress and stress concentration and the cracks expanded ,finally caused the gear fracture.