Precise columnar member and method of producing the same
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United States of America Patent
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N/A
Issued Date -
Nov 7, 2002
app pub date -
May 6, 2002
filing date -
Dec 13, 1999
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The present invention relates to a metallic, precise columnar member having an outer diameter with high accuracy, wherein the columnar member comprises a plurality of flattened thread ridges having a predetermined outer diameter provided on the surface of a metallic columnar blank in an axial direction. The method of the present invention comprises the steps of using rolling to form a plurality of thread ridges on the surface thereof and using rolling or drawing to make the tops of the thread ridges flat.
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