CUTTING TOOL INSERT AND METHOD OF ITS MANUFACTURE Russian patent published in 1999 - IPC

FIELD: manufacture of cutting tools for metal working with formation of chips. SUBSTANCE: insert has at least partial coating formed by at least two high-temperature layers. One of these layers is fine-grained layer of α-Al₂O₃. It presents upper layer along rib of cutting edge. The other is layer of TiC_xO_yN_z or ZrC_xN_y and constitutes upper layer on rear surface. Cutting tool with coating ensures improved wear resistance of rear surface and resistance to crater wear, particularly, in cases of machining of low-carbon steels and stainless steel. Used cutting edges may easily by identified by naked eye. EFFECT: higher efficiency. 9 cl, 1 dwg