Transformable metal surface hardening method
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United States of America Patent
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Oct 16, 2012
Grant Date -
Mar 5, 2009
app pub date -
Jan 15, 2007
filing date -
Mar 8, 2006
priority date (Note) -
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Abstract
A method of metal surface hardening treatment inducing transformation, in which transformation is induced in a surface interior of material as hardening treatment object by simple, rapid treatment utilizing a frictional heat under pressure without the occurrence of melt loss, quench crack, soft spot, deformation, etc. to thereby reform the structure of surface interior of material as hardening treatment object into a miniaturized martensitic structure. The method of surface hardening treatment comprised the steps of while rotating nearly cylindrical pressurization tool (2) at high velocity, pressing the bottom face thereof slightly into the surface of material as hardening treatment object (1) so as to attain application of given pressure, thereby generating a local frictional hear between the pressurization tool and the material as hardening treatment object; inducing transformation in the material as hardening treatment object at the locality having been exposed to the frictional heat; and when the surface of material as hardening treatment objent positioned in the vicinity of the pressurization tool starts to soften by the frictional heat, moving the pressurization tool.
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