METHOD FOR FORECASTING LIFE OF MATERIAL FOR ROLLING BEARING AND ROLLING BEARING HAVING LONG LIFE DISCRIMINATED BY FORECASTING LIFE

摘要

PROBLEM TO BE SOLVED: To provide a method to precisely forecast the life of a material for a rolling bearing in a short time and a rolling bearing to ensure discrimination of a long life through forecasting. SOLUTION: Frequency distribution of each of inclusion sizes into which a nonmetallic inclusion is classified by a kind is employed as a parameter of the degree of an internal defect of a material by which unevenness in the life of a rolling bearing is widely influenced. By using a life forecasting formula incorporating frequency distribution quantified by mathematical expression, a life of a material for a rolling bearing is high-precisely forecasted in a short time without executing a rolling life test.