Cutting tool
AssigneeAB Sandvik Coromant
InventorsAndreas Blomqvist, Jose Luis Garcia, Erik Holmstrom
Life of this patent
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Abstract
A cutting tool includes a substrate of cemented carbide having hard constituents in a metallic binder. The hard constituents include WC. The WC content in the cemented carbide is 80-95 wt %. The cemented carbide has a Fe+Ni+Co+Cr content of 3-13 wt %, an atomic ratio of 0.05<Fe/(Fe+Ni+Co+Cr)<0.35, an atomic ratio of 0.05<Ni/(Fe+Ni+Co+Cr)<0.35, an atomic ratio of 0.05<Co/(Fe+Ni+Co+Cr)<0.35 and an atomic ratio of 0.05<Cr/(Fe+Ni+Co+Cr)<0.35. The crack resistance W measured on the rake face of the cutting tool is at least 25% higher than the W measured on a cross section of the bulk area of the cutting tool.
Claims15
A cutting tool comprising:
- a substrate of cemented carbide, wherein the cemented carbide comprises hard constituents in a metallic binder, wherein the hard constituents include WC and wherein the WC content in the cemented carbide is 80-95 wt %, and wherein the cemented carbide has a Fe+Ni+Co+Cr content of 3-13 wt %, an atomic ratio of 0.05<Fe/(Fe+Ni+Co+Cr)<0.35, an atomic ratio of 0.05<Ni/(Fe+Ni+Co+Cr)<0.35, an atomic ratio of 0.05<Co/(Fe+Ni+Co+Cr)<0.35 and an atomic ratio of 0.05<Cr/(Fe+Ni+Co+Cr)<0.35;
- and
- a rake face, a flank face and a cutting edge there between, and wherein a crack resistance W is defined as
- W
- =
- P
- 4
-
- a
- ¯
- wherein P is a load 100*9.81N of a Vickers hardness indentation and is an average crack length of each crack formed at corners of the Vickers hardness indentation, wherein W as measured on the rake face of the cutting tool is at least 25% higher than the W as measured on a cross section of a bulk area of the cutting tool.
Dependencies are inferred from the claim text.