某发电厂的风力发电机在运行中齿轮箱出现故障,经现场检查发现在风机某一级传动齿轮中有一个齿轮出现断齿现象,断裂部位在轮齿的中间腰部位置。为了判断风机齿轮箱的断裂性质及原因,对风机齿轮箱断齿残片进行了宏微观观察,对断齿残片基体及断口源区进行了能谱分析,测定了断齿表面残余应力,还对齿轮进行了断口定量分析。结果表明,风机齿轮箱齿轮轮齿失效性质为弯曲疲劳断裂。可基本排除齿轮设计、材质、使用维护方面的异常,齿轮断裂原因在于断裂部位存在夹渣缺陷。

The gear case in a wind power generator failed during service,and it was found that a tooth of a gear in the gear case fractured.In order to find out the fracture cause of the gear,macro and micro observation was carried out on the fractured gear,energy spectrum analysis was conducted on the matrix and the fracture source region of the gear,surface residual stress was tested,and finally,fracture quantitative analysis was carried out.The results show that the failure mode of the gear is bending fatigue fracture.The fracture of the gear is caused by slag inclusions at the position of the gear,and has nothing to do with the design,material,and operation of the gear.