METHOD OF MANUFACTURING SHAFT MEMBER FOR WHEEL ROLLING BEARING DEVICE
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United States of America Patent
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Issued Date -
Sep 13, 2012
app pub date -
Feb 21, 2012
filing date -
Mar 7, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
According to a method of manufacturing a flanged shaft member having a plurality of flanges used to fasten the shaft member to a wheel, when the flanges are formed on a part between a shaft portion and a fitting shaft portion through lateral extrusion while a forged recess is formed at a center of an end surface of the fitting shaft portion with the use of a forging die apparatus for cold forging, each flange is formed so as to be curved in a direction opposite to a direction, in which the flange warps due to springback caused after the lateral extrusion, by an amount corresponding to an amount of warpage due to the springback.
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