Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2007-07-17
2007-07-17
Turner, Archene (Department: 1775)
Stock material or miscellaneous articles
Composite
Of inorganic material
C051S295000, C051S309000, C075S241000, C428S469000, C428S472000, C428S699000, C204S192380
Reexamination Certificate
active
10922750
ABSTRACT:
The present invention relates to the PVD coated tungsten carbide (WC) based cemented cutting inserts with ruthenium (Ru) as a key chemical element, or a key feature, in the cobalt (Co)-based binder phase, particularly useful for machining today's mold & die materials. In the Ru—Co mixed binder phase in the tungsten carbide substrate, the ratio of Ru/Co is at least 3%, by weight. The Ru-featured carbide cutting insert provided in this invention is PVD coated with one or more layers by a modern PVD coating technology. The development of the PVD coated Ru-featured carbide cutting inserts provided in this invention is based on a discovery that the unique combination of PVD coating techniques and Ru-featured carbide cutting inserts demonstrates superior machining performance in today's mold & die machining applications.
REFERENCES:
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Tracey et al “Development of Tungsten Carbide-Cobalt-Ruthenium Cutting Tools for Machining Steels” Proceedings Annual Microprogrammin Workshop vol. 14, 1981, p. 281-292.
Fang X. Daniel
Festeau Gilles
Wills David J.
Kirkpatrick + Lockhart Presto Gates Ellis LLP
Leslie Mark R.
TDy Industries, Inc.
Turner Archene
Viccaro Patrick J.
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