Sandvik Intellectual Property Ab

Carl Björmander

Markus Rodmar

A method for making a coated cutting tool insert by depositing by CVD, onto a cemented carbide, titanium based or ceramic substrate a hard layer system, having a total thickness of from about 2 to about 50 &#x3bc;m, comprising at least one layer selected from titanium carbide, titanium nitride, titanium carbonitride, titanium carboxide and aluminum oxide, and an outer, from about 1 to about 15 &#x3bc;m thick, aluminum oxide layer or (AlO+ZrO)*N multilayer, a penultimate outermost layer of TiO, where x ranges from about 1 to about 2, and an outermost, from about 0.3 to about 2 &#x3bc;m thick, TiCNO, layer, where x+y+z=1, x&#x2267;0, y&#x2267;0, and z&#x2267;0, followed by a post-treatment removing at least said outermost layer on the edge-line and on the rake face.

Coated cutting tool insert

The present invention relates to a metal cutting tool insert with a coating comprising a metal oxide multilayer, which exhibits especially high resistance to plastic deformation as well as excellent resistance to flank and crater wear and high resistance to flaking, particular when used for machining of low carbon steel and stainless steel. The invention also relates to a method of making such a cutting tool insert.

A method for making a coated cutting tool insert by depositing by CVD, onto a cemented carbide, titanium based or ceramic substrate a hard layer system, having a total thickness of from about 2 to about 50 &#x3bc;m, comprising at least one layer selected from titanium carbide, titanium nitride, titanium carbonitride, titanium carboxide and aluminum oxide, and an outer, from about 1 to about 15 &#x3bc;m thick, aluminum oxide layer or (AlO+ZrO)*N multilayer, a penultimate outermost layer of TiO, where x ranges from about 1 to about 2, and an outermost, from about 0.3 to about 2 &#x3bc;m thick, TiCNOlayer, where x+y+z=1, x&#x2267;0, y&#x2267;0, and z&#x2267;0, followed by a post-treatment removing at least said outermost layer on the edge-line and on the rake face.

Growing community of inventors

Spågna, Sweden

Carl Björmander