Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Reexamination Certificate
1999-05-21
2001-04-17
Turner, Archene (Department: 1775)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
C051S295000, C051S307000, C051S309000, C407S119000, C428S212000, C428S336000, C428S307300, C428S307700, C428S312200, C428S312800, C428S318400, C428S319100, C428S469000, C428S551000, C428S552000, C428S565000, C428S610000, C428S698000, C428S701000
Reexamination Certificate
active
06217992
ABSTRACT:
BACKGROUND
The invention concerns a coated cemented carbide cutting insert that has a substrate with a porosity (per the ASTM Designation B 276-86, entitled “Standard Test Method for Apparent Porosity in Cemented Carbides”) of greater than C00 and less than or equal to C04 wherein there is a zone of non-stratified, i.e., generally homogeneous, binder enrichment beginning near and extending inwardly from a peripheral surface of the substrate.
Heretofore, there has been the Kennametal KC850® coated cutting insert (KC850 is a registered trademark of Kennametal Inc., of Latrobe, Penn. 15650, USA, for cutting inserts) which has a C03/C05 porosity substrate which has a zone of surface binder enrichment. This binder enrichment is a stratified type of binder enrichment meaning that the binder enrichment forms in distinct layers of binder metal. The Nemeth et al. article, “The Microstructural Features and Cutting Performance of the High Edge Strength Kennametal Grade KC850,” Proceedings of Tenth Plansee Seminar, Reutte, Tyrol, Austria, Metalwerke Plansee A.G. (1981), pp. 613-627, describes the “Kennametal KC850®” coated cutting tool (or insert). The “Kennametal KC850®” coated cutting insert has a tri-phase coating of TiC—TiCN—TiN, according to U.S. Pat. No. 4,035,541, to Smith et al., entitled “Sintered Cemented Carbide Body Coated with Three Layers.”
SUMMARY
The invention is a cutting insert which comprises a rake face and a flank face wherein there is a cutting edge at the juncture of the rake face and the flank face. The cutting insert has a coating and a substrate wherein the coating is adherently bonded to the substrate. The substrate is a tungsten carbide-based cemented carbide which has a bulk composition of between about 3 to about 12 weight percent cobalt, up to about 12 weight percent tantalum, up to about 6 weight percent niobium, up to about 10 weight percent titanium, and the balance tungsten and carbon. There is a zone of non-stratified cobalt enrichment beginning near and extending inwardly from a peripheral surface of the substrate. The zone of non-stratified enrichment has A porosity. The bulk substrate has a porosity of greater than C00 and less than or equal to C04.
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Kennametal PC Inc.
Prizzi John J.
Turner Archene
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