| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for stably and accurately predict the service life of material for a rolling bearing in a short period of time, and the rolling bearing having the long service life discriminated and ensured by the service life prediction. SOLUTION: Image analysis using a color image is performed when measuring the size of the non-metallic inclusions in material for the rolling bearing. Thereby, a plurality of kinds of inclusions having different effects on the service life are separately measured, and the service life of the material for the rolling bearing is stably predicted with higher accuracy than the conventional case by using the service life prediction formula including the maximum size of the inclusions estimated by a method of extreme value statistics on the basis of the frequency distribution of the size of the inclusions classified into kinds, without testing a rolling life. COPYRIGHT: (C)2008,JPO&INPIT
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