To produce a caulked portion 11 having a stable shape and size while keeping the quality of the surface of the caulked portion 11 good, improve the life of a die 15, and secure the strength of supporting an inner ring 7 on a hub body 6.
In the state that the inner ring 7 is externally fitted to the inner end of the hub body 6, a cylinder portion 13 formed at the inner end of the hub body 6 is plastically deformed by the die 15 being rockingly turned to machine the caulked portion 11. The frequency of the passage of the die 15 through the inner end of the hub body 6 where the caulked portion 11 is to be formed is 15-120 during a time from starting work for forming the caulked portion 11 to finishing the work. The rockingly turning speed of the die 15 is low, 100-600 min-1.
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MORICHIKA YASUHIRO
HORIIE AKIFUMI
YASUMURA SHOKO
Nakai Shun
Kinzo Koyama