特大型轴承内圈断裂原因分析及预防措施

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摘要：轴承在安装过程中出现内圈贯穿断裂，通过宏观检查、断口分析、化学成分分析、金相检测、材料及热处理质量检测，对其断裂原因进行了分析。结果表明：该套轴承内圈心部存在局部锻造过烧缺陷，该轴承在安装受力时，沿缺陷部位贯穿断裂。

关键词：特大型轴承；早期失效；贯穿断裂；断口分析；锻造过烧

Cause analysis and preventive measures of fracture of oversize bearing inner ring

WANG Chan， WU Yonggang， ZENG Chaofan

State Key Laboratory of Aviation Precision Bearing， Luoyang LYC bearing Co.， Ltd.， Luoyang 471039， Henan， China

Abstract： The fracture of inner ring occurs in the process of bearing installation， the cause of the failure was analyzed by means of macro-examination， fracture analysis， chemical composition analysis， metallographic examination， material and heat treatment quality testing. The results show that the inner ring of the bearing has a partial forging overburn defect， and the bearing breaks along the defect during installation.

Keywords： oversize bearing; early failure; through fracture; fracture analysis; forging overburning

1 序言

在大型机械设备中，滚动轴承是最为关键的核心零件之一，若轴承出现故障，不仅会影响机械设备的正常工作，而且会带来极为严重的安全隐患[1]。（剩余2056字）