Patent ID: 8349474

Claim:
A hob cutter tool with a coating, wherein the coating ( 12 ) is produced through a physical vapor deposition method, in which in a coating chamber in a nitrogen containing atmosphere an arc discharge is generated in each case between at least one anode and at least one pure Al cathode on the one hand, and at least one pure Cr cathode on the other hand, and in this manner, Al and Cr are vaporized from the cathodes, in which the hob cutter tool ( 10 ) to be coated rotates in the coating chamber, wherein it is guided subsequently past the at least two cathodes, and in which the vaporized Al and Cr is deposited in atomic or ionic form together with nitrogen from the nitrogen containing atmosphere onto the rotating hob cutter tool ( 10 ) being guided past the cathodes, wherein the coating has a multiplicity of layers ( 14 ), composed of (AlCr)-nitride, arranged on top of each other, wherein the multiplicity of layers ( 14 ) is formed from two layer types ( 20 , 22 ) differing with respect to their Al:Cr ratio, wherein a first layer type has an Al:Cr ratio in the range of 55:45 to 65:35, and a second layer type has an Al:Cr ratio in the range of 70:30 to 74:26, and wherein the two layer types ( 20 , 22 ) alternate with each other in the coating ( 12 ), wherein each of the layers ( 14 ) in turn is formed from a multiplicity of nanolayers arranged on top of each other, and wherein the coating ( 12 ) is connected to the tool base body ( 16 ) via a bonding layer ( 18 ).