Viscous coupling plate hardening and flattening method

Details Viscous coupling plate hardening and flattening method Viscous coupling plate hardening and flattening method

1994-02-28

1996-01-02

Walsh, Donald P.

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148645, C23C 830

Patent

active

H00015121

ABSTRACT:
A method of hardening and flattening a viscous coupling plate generally combining a heat treatment process followed by roller leveling is disclosed. The heat treatment process produces an epsilon iron nitride surface layer of the desired hardness on the plate. Subsequent to the heat treatment, the plates are passed through a series of leveling rolls to produce a sufficiently flat plate. The flat rolling process can incorporate a single pass or multiple passes through the leveling rolls. The method of the present invention eliminates any distortion in the plates and brings them within any required flatness specifications, as well as producing viscous coupling plates that exhibit improved resistance to permanent deformation under operating conditions.

REFERENCES:
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New Venture Gear Process Standard No. 632 Rev. A, Dec. 5, 1991 2 pages.
Metals Handbook, "Nitriding", 1948 Edition, The American Society for Metals, 1948, pp. 697-702.

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