齿轮破碎失效分析

Failure Analysis of Broken Gear

某小齿轮在使用一段时间后破碎了,利用多种检测手段对其进行分析,包括低倍、化学成分、金相组织等实验。结果表明,小齿轮碎裂起源于齿根表面的严重应力集中型、高名义应力双向弯曲疲劳断裂和过应力冲击脆断,发生断裂是因为齿根未表淬,抗疲劳强度低所致。

A small gear, after a period of time in use broken, through a variety of means of detection are analyzed, including the low times, chemical composition, metallographic structure test, results show that, the small gear tooth surface fragmentation originated from serious stress concentration, high nominal stress and biaxial bending fatigue fracture and should be the brittle fracture of tooth impact, not the surface quenching, anti fatigue strength is low due to.