Wear-resistant coating for metal-removing tools, particularly for rotary metal-cutting tools
AssigneeDr.Jorg Guhring
InventorsFrank-R Weber, Eberhard Moll
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Abstract
The invention concerns a wear-resistant coating on rotary metal-cutting tools such as drill bits, countersinks, milling cutters, screw taps, reamers, etc. The coating according to the invention consists essentially of nitrides of Cr, Ti and Al with a unusually high share of Cr atoms, namely 30 to 60% referred to the totality of metal atoms. In multilayer coatings and even more in coatings made of homogeneous mixed phases, this high Cr share results in particularly large tool life distances for the tools hardened with these coatings. These tools exhibit their superiority particularly during dry use without cooling lubricants or with minimal lubrication.
Claims4
A wear-resistant coating on metal-removing tools, particularly rotary metal-cutting tools, consisting essentially of nitrides with the metal components Cr, Ti and Al and preferably a small share of elements for grain refining, characterized by
- a Cr share of 30 to 65%, preferably 30 to 60%, particularly preferred 40 to 60%
- an Al share of 15 to 35%, preferably 17 to 25%, and
- a Ti share of 16 to 40%, preferably 16 to 35%, particularly preferred 24 to 35%,
- in each case referred to all metal atoms in the entire coating.
Dependencies are inferred from the claim text.