Metal working – Method of mechanical manufacture – Process for making bearing or component thereof
Reexamination Certificate
2005-08-16
2005-08-16
Compton, Eric (Department: 3726)
Metal working
Method of mechanical manufacture
Process for making bearing or component thereof
C029S898070, C029S898140, C029S894361, C029S894362, C029S509000, C072S370110, C301S105100, C384S544000
Reexamination Certificate
active
06928737
ABSTRACT:
A cylindrical portion10is not quenched, and its hardness of a cylindrical portion10is set at Hv200 to 300. An average cross sectional area of the crystal particle in this portion is set to be within 0.03 mm2. Accordingly, when a caulking portion is formed by expanding the cylindrical portion10bto an inner ring3to a hub2bmade of carbon steel, cracks or the like are not formed in the resultant caulking portion.
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Ishida Hirohide
Miyazaki Hiroya
Compton Eric
NSK Ltd.
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