Patent ID: 8080323
Filing Date: 2011-12-20
Classification: B23B,C23C,Y10T

Abstract:
1. A coated cutting insert for use in a chip-forming material removal operation, the coated cutting insert comprising: a substrate having a flank surface and a rake surface wherein the flank surface intersects the rake surface to form a cutting edge at the intersection; a wear-resistant coating scheme adhering to at least a portion of the substrate, and the wear-resistant coating scheme comprising one or more coating layers of one or more of alumina, hafnia and zirconia; a wear indicating coating adhering to at least a portion of the wear-resistant coating scheme, and the wear indicating coating comprising M(O wherein the wear-indicating coating existing on the rake surface of the substrate being of one visually perceivable color and the wear-indicating coating existing on the flank surface of the substrate being of another visually perceivable color, and at least one of the wear-indicating coating on the rake surface and the wear-indicating coating on the flank surface comprising a mechanically treated coating layer wherein the mechanical treatment lightens the color of the as-deposited coating layer from a color unsuitable as a wear indicator to a visually perceivable color suitable as a wear indicator.