| 摘要 |
In a manufacturing method and a manufacturing apparatus for a wheel-support rolling bearing unit, when forming a crimped portion 14 on an end (inside end) of a hub main body 8 a, by rocking die forging using a die 26 , while preventing enlargement of equipment, in order to prevent forming indentations in a second outer raceway 6 a and a second inner raceway 12 a, in the present invention, the outer ring 1 a is turned by a motor 48 , and the balls 32 are rotated. A difference is provided between the rotation speed of the balls 32 and an oscillation speed of the die 26 . This difference is preferably at least 10 min<SUP>-1</SUP>. By rotating the balls 32 the formation of indentations in the second outer raceway 6 a and the second inner raceway 12 a is prevented. Moreover, by providing the difference between the rotation speed and the oscillation speed of the die 26 , an increase in the torque required for rotation the outer ring 1 a is suppressed.
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