Thread rolling die
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United States of America Patent
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Issued Date -
Dec 31, 2009
app pub date -
Jun 15, 2009
filing date -
Jun 26, 2008
priority date (Note) -
Abandoned
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Abstract
A thread rolling die having a nitride diffusion layer formed in a surface layer portion of a form rolling surface portion for thread rolling to plastically deform a surface of a workpiece, the nitride diffusion layer being formed in an ion nitriding treatment such that a compound layer depth is 1 μm or smaller, a practical nitride layer depth ranges from 5 to 40 μm, and either of that a surface hardness is 1300 HV or larger or that a surface hardened amount is 400 HV or larger.
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