Coated cutting tool
AssigneeAB Sandvik Coromant
InventorCarl Bjormander
Life of this patent
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Abstract
A coated cutting tool for metal machining has a base body of cemented carbide, cermet, ceramics, steel or high-speed steel, and a wear resistant coating deposited thereon. The coating includes a layer of Ti1-xAlxCyNz with 0.40≤x≤0.95, 0≤y≤0.10 and 0.85≤z≤1.15, and a portion of MeCaNb, 0≤a≤1, 0≤b≤1, a+b=1, present on the layer of Ti1-xAlxCyNz. The portion of MeCaNb covers from 5 to 28% of the layer of Ti1-xAlxCyNz. A process for the production of the coated cutting tool and the use of the coated cutting tool in machining of stainless steel is also provided.
Claims15
A coated cutting tool comprising:
- a rake face, a flank face and a cutting edge in between the rake face and the flank face;
- a base body of cemented carbide, cermet, ceramics, steel or high-speed steel;
- and
- a coating having a total thickness of from 2 to 20 μm, wherein said coating comprises a layer of Ti1-xAlxCyNz with 0.40≤x≤0.95, 0≤y≤0.10 and 0.85≤z≤1.15, having a thickness of from 1 to 18 μm, wherein the layer of Ti1-xAlxCyNz includes crystallites with grain boundaries and being of a columnar structure, the Ti1-xAlxCyNz having a ≥85 vol-% face-centered cubic (fcc) crystal structure, and, on the rake face, a portion of MeCaNb, 0≤a≤1,0≤b≤1, a+b=1, present on the layer of Ti1-xAlxCyNz, wherein the layer of Ti1-xAlxCyNz together with the portion of MeCaNb forms an outermost part of the coating, Me is Ti and/or Zr, wherein a portion of MeCaNb in an area on the rake face at a distance of from 200 to 400 μm from the cutting edge covers from 5 to 28% of the layer of Ti1-xAlxCyNz (8), the portion of MeCaNb being distributed over said area.
A process for the production of a coated cutting tool having a rake face, a flank face and a cutting edge in between the rake face and the flank face, the cutting tool including a base body of cemented carbide, cermet, ceramics, steel or high-speed steel, and a from 2 to 20 μm thick coating including a from 1 to 18 μm thick layer of Ti1-xAlxCyNz with 0.40≤x≤0.95, 0≤y≤0.10 and 0.85≤z≤1.15, the layer of Ti1-xAlxCyNz having crystallites with grain boundaries and being of a columnar structure, the Ti1-xAlxCyNz having a ≥85 vol-% face-centered cubic (fcc) crystal structure, wherein the process comprises the following steps:
- providing the layer of Ti1-xAlxCyNz by a CVD process;
- providing a layer of MeCaNb, 0≤a≤1, 0≤b≤1, a+b=1, by a CVD process directly above the layer of Ti1-xAlxCyNz, wherein Me is Ti and/or Zr;
- blasting a surface of the coating until there is a portion of MeCaNb remaining in an area on the rake face at a distance of from 200 to 400 μm from the cutting edge covering from 5 to 28% of the layer of Ti1-xAlxCyNz, the portion of MeCaNb being distributed over said area.
Dependencies are inferred from the claim text.