leometwu的部落格

用在工具機主軸, 一個萬把塊錢, 光是空轉6小時就 聲響大噪!

下: 滾珠軌道以~30度側光照射, 軌道面不反射, 故呈黑色. 亮點是剝落後凹穴的反射光. 整個軌道面發現佈滿了許多這種掉屑後留下的坑坑疤疤. 這是產生噪音的來源.

Oblique light (~30^。) projects on the raceway. Bright spots are reflection from spalled areas. A great number of spalled areas are found on raceway of the bearing. Spalling / flaking  is the cause of the loud noise after 6 hours of run-in test. 
 

上: 暗視場照明;   下: 明視場照明下的軌道面. above: dark field illumination. below: bright field illumination.

此例與下列連桿軸承面受交變應力產生疲勞裂面相似:都是由液析薄片狀碳化物引發.