US Patent: 7,431,542
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| Coated Cutting Insert
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Patentee:
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| Ingemar Hessman (exact or similar names) - Sandviken, Gävleborg County, Sweden |
| USPTO Classifications: |
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407/119, 427/249.19, 427/255.391, 427/368, 427/419.2, 427/419.7, 428/156, 428/176, 428/216, 428/325, 428/698, 428/701, 428/702, 51/307, 51/309, 76/44
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| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Oct. 31, 2005 |
| Granted: |
Oct. 07, 2008 |
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Joel Havens
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Description: |
| Abstract:
A cutting insert preferably for milling of extremely highly alloyed grey cast iron, of a substrate and a coating and methods of making and using the insert are disclosed. The cemented carbide substrate includes WC, of from about 3 to about 8 weight-% Co and less than about 0.5 weight-% carbides of metals from groups IVb, Vb or VIb of the periodic table. The coating has a first, innermost layer of TiC.sub.xN.sub.yO.sub.z with x+y+z=1, y>x and z less than about 0.2, preferably y greater than about 0.8, and z=0, with equiaxed grains with size less than about 0.5 .mu.m and a total thickness of from about 0.1 to about 1.5 .mu.m, a layer of TiC.sub.xN.sub.y with x+y=1, x greater than about 0.3 and y greater than about 0.3, preferably x greater than or equal to about 0.5, with a thickness of greater than about 3 to about 5 .mu.m with columnar grains with an average diameter of less than about 5 .mu.m, a layer of a smooth, fine-grained, grain size of from about 0.5 to about 2 .mu.m, .kappa.-Al.sub.2O.sub.3 with a thickness of from about 0.5 to about 3 .mu.m and an outermost layer of TiN with a thickness of less than about 2 .mu.m. |
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