Rotor hub, spindle motor and hard disk drive
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United States of America Patent
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-
May 29, 2012
Grant Date -
Apr 23, 2009
app pub date -
Oct 23, 2008
filing date -
Oct 23, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a method for manufacturing a rotor hub for use in a spindle motor, free-cutting stainless steel is used as a material of the rotor hub. A slug of free-cutting stainless steel is subjected to a plastic working to form a disk mounting portion and a cylindrical surface positioned radially inwardly of the disk mounting portion. Then, a cylindrical disk fitting surface is formed by machining substantially the entirety of the cylindrical surface. The rotor hub contains A-type inclusions appearing in a cross section taken along a center axis of the disk mounting portion. The A-type inclusions are oriented in directions different than the center axis.
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