To prolong the service life of a rolling bearing by a method wherein attention is paid on the flow of a material associated with deformation of a blank in forging.
If the core of the blank appears on the surface layer of a raceway groove 21A in the forging process, on the surface layer of the raceway groove 21A, a number of extremely bent fiber flows T are observed to line up in rows with directionality. If the angle formed between a straight line (a straight line exhibiting plastic flow) LS showing the direction of the line (plastic-flow curve) LT made by connecting the bending points of the fiber flows T and the tangent LO of the raceway groove at the contact points P is taken as θ, the angle θ is specified to be 0-50°. Further, the plastic flow is allowed to occur in the depth of at least 100 μm from the raceway (d≥100 μm).
| JP2005083513A | 2005-03-31 |
Yoshiaki Naito
Cui Shu Tetsu