Stock material or miscellaneous articles – Composite – Of metal
Patent
1993-12-02
1996-03-05
Silverberg, Sam
Stock material or miscellaneous articles
Composite
Of metal
148287, 403404, 403345, C23C 812
Patent
active
054966469
ABSTRACT:
Iron and steel interference fit assemblies with increased retention forces comprised of a purposely formed iron oxide layer of limited thickness on one or both of the mutually engaging surfaces. The new methods to create the new interference fit assemblies comprise heating of iron and steel parts intended for press fit assembly to temperatures substantially between 500.degree. F. (260.degree. C.) and 1050.degree. F. (566.degree. C.) for periods of time in air between ten hours and ten minutes to create an iron oxide surface layer of optimum thickness on at least one of the mutually engaging surfaces prior to assembly. Other methods to generate the optimum thickness of iron oxide layer may also be used. The iron oxide surface layer substantially increases the frictional retention force in the assembly. The retention force effectively doubles with heating at 700.degree. F. (371.degree. C.) to 800.degree. F. (427.degree. C.) for two hours with test results indicating these conditions to be optimal for increasing the frictional retention force. The result is iron and steel interference fit assemblies with substantially increased retention forces.
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NTN Technical Center (U.S.A.), Inc.
Silverberg Sam
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