Stock material or miscellaneous articles – Structurally defined web or sheet – Including components having same physical characteristic in...
Reissue Patent
2007-10-23
2007-10-23
Turner, Archene (Department: 1775)
Stock material or miscellaneous articles
Structurally defined web or sheet
Including components having same physical characteristic in...
C051S307000, C051S309000, C407S119000, C428S325000, C428S336000, C428S697000, C428S698000, C428S699000, C428S701000, C428S702000
Reissue Patent
active
11449891
ABSTRACT:
The present invention relates to a coated cemented carbide insert for turning of steel, like low alloyed steels, carbon steels and tough hardened steels at high cutting speeds. The cemented carbide consists of WC, 2-10 wt. % Co and 4-12 wt. % of cubic carbides of metals from groups 4, 5 or 6 of the periodic table, preferably Ti, Ta and Nb. The Co-binder phase is highly alloyed with W with a CW-ratio of 0.75-0.90. The insert has a binder phase enriched and essentially cubic carbide free surface zone A of a thickness of <20 μm and along a line C essentially bisecting the edge, in the direction from the edge to the centre of the insert, a binder phase content increases essentially monotonously until it reaches the bulk composition. The binder phase content at the edge is 0.65-0.75 times the binder phase content by volume of the bulk and the depth of the binder phase depletion is 100-300 μm, preferably 150-250 μm. The insert is coated with 3-12 μm columnar TiCN-layer followed by a 2-12 μm thick Al2O3-layer.
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Lenander Anders
Lindholm Mikael
Ljungberg Bjorn
Palmqvist Lisa
Thysell Michael
Drinker Biddle & Reath LLP
Sandvik Intellectual Property AB
Turner Archene
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