Cutting tool with a TiAlN coating having rake and relief surfaces with different residual stresses

A metal cutting insert comprising:

• a substrate body and a chemical vapor deposition (CVD) coating over the substrate body,
• the substrate body is of cemented carbide, cermet, or ceramic;
• the substrate body comprises at least one rake face and at least one relief face that intersect to form a cutting edge,
• the CVD coating comprises one or more layers wherein at least one layer has a composition comprising aluminum, titanium and nitrogen having a cubic face centered lattice structure, represented by a formula (AlxTi1-xMy)CzN1-z wherein a stoichiometry coefficient of aluminum is 0.30<x<0.95, wherein M is at least one element selected from the group consisting of Cl and Ar, with a stoichiometry coefficient of which is 0≤y<0.01, and wherein a stoichiometry coefficient of carbon is 0≤z<0.3;
• the chemical vapor deposition process results in coated surfaces of the substrate body having a tensile residual stress;
• and
• the (AlxTi1-xMy)CzN1-z layer satisfies a relationship 10<|S1-S2|<500 MPa, wherein S1 is the residual stress measured on the rake face, and S2 is the residual stress measured on the relief face;
• said metal cutting insert made by:
• providing a substrate body comprising at least one rake face and at least one relief face that intersect to form a cutting edge,
• applying, with a CVD process, as CVD coating comprising at least one layer of (AlxTi1-xMy)CzN1-z under conditions which results in said layer having a tensile residual stress;
• and
• applying a post coating mechanical process so that the (AlxTi1-xMy)CzN1-z layer satisfies a relationship 10<|S1-S2|<500 MPa, wherein S1 is the residual stress measured on the rake face, and S2 is the residual stress measured on the relief face.