Coated drill and method of making the same

摘要

The present invention relates to a drill comprising a cemented carbide or high speed steel substrate and a coating wherein the coating comprises: a first layer system having a multilayered structure covering substantially the whole active part of the drill, a second layer system having a multilayered structure covering only the tip area of the drill. Drills according to the present invention have good wear resistance and improved properties when reconditioning the drill. The present invention also relates to a method of making a drill according to the present invention.