Coated cutting tool insert

US7897247B2 · kind B2 · utility

Assignee

• Sandvik Intellectual Property AB · SE

Inventors

• Per Mårtensson · Nacka, SE
• Per Gustafson · Huddinge, SE

Key dates

• Filing date: Nov 20, 2006
• Grant date: Mar 1, 2011
• Expiry date: Aug 7, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/265
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The present invention discloses coated cutting tool inserts particularly useful for turning of nodular cast iron preferably at high speeds, comprising a cemented carbide substrate comprising from about 5 to about 9 wt-% Co and from about 1 to about 5 wt % cubic carbides and balance WC of 86-94 wt-%, and a coating comprising a first layer of TiCxNyOz with equiaxed grains, a layer of TiCxNyOz with a thickness of less than about 10 to about 15 μm with columnar grains, a layer of TiCxNyOz with a thickness of from about 0.1 to about 2 μm and with equiaxed or plate-like grains, a layer of α-Al2O3 with thickness from about 3 to about 8 μm, an outer layer of a multilayered structure of TiN+TiC with TiC being the outermost layer and a total thickness of from about 0.5 to about 2 μm and wherein the outer coating layer has been removed in the edge line and on the rake face so that the α-Al2O3 layer is on top along the cutting edge line and on the rake face and the outer TiC layer is the top layer on the flank face.