A coated cutting tool includes a body and a PVD coating disposed on the body. The body being cemented carbide, cermet, ceramics, polycrystalline diamond, polycrystalline cubic boron nitride based materials or a high speed steel. The coating includes a first layer of (Ti1-xAlx)N wherein 0.3x0.7, and a second layer of (Ti1-p-qAlp Siq)N with 0.15p0.45, and 0.05q0.20, wherein the second layer is deposited outside the first layer as seen in a direction from the body.

A coated cutting tool has at least one rake face and at least one flank face and a cutting edge therebetween. The coated cutting tool includes a substrate and a coating. The coating includes a (Ti,Al)N layer. The (Ti,Al)N layer is either a single monolithic layer or a multilayer of two or more alternating (Ti,Al)N sub-layer types having different compositions. The (Ti,Al)N layer has an overall atomic ratio Al/(Ti+Al) of >0.67 but ?0.85, wherein the (Ti,Al)N layer shows a plane strain modulus distribution along a direction perpendicular to a cutting edge on the rake face and/or the flank face. The plane strain modulus at a point at a distance of 0.5 mm from a point at the cutting edge is more than 85% of the plane strain modulus at the cutting edge, with the plane strain modulus at the cutting edge being ?450 GPa.

A coated tool in a non-limiting embodiment of the present disclosure includes a base and a coating film located on the base. The coated tool includes a first surface, a second surface adjacent to the first surface, and a cutting edge located on at least a part of a ridge part of the first surface and the second surface. The coating film includes an AlTiN film. The coating film has a first compressive stress ?11 in a first direction which is parallel to a surface of the base and intersects with the cutting edge at an angle of 90?, and a second compressive stress ?22 in a second direction which intersects with the first direction at an angle of 90?. The first compressive stress ?11 is different from the second compressive stress ?22.

The present invention is directed to a surface-coated cubic boron nitride sintered material tool including a cBN substrate and a hard coating layer formed on a surface of the cBN substrate and having an alternate laminated structure of A layer and B layer. A peak of the grain size distribution of cBN grains in the cBN sintered material is present within a range of a grain size from 0.50 to 1.00 m. The A layer has a composition of (Ti.sub.1-xAl.sub.x)N (0.4x0.7 in an atomic ratio). The B layer has a composition of (Cr.sub.1-y-zAl.sub.yM.sub.z)N (0.03y0.6 and 0z0.05 in an atomic ratio). An X-ray diffraction peak of a (200) plane is present at a position of a diffraction angle of 43.6 plus or minus 0.1 degrees, and a plastic deformation work ratio of the B layer is 0.35 to 0.50.

A coated cutting tool includes a substrate of cemented carbide, cermet, ceramics, steel or cubic boron nitride and a multi-layered wear resistant coating. The multi-layered wear resistant coating has a total thickness from 5 to 25 m and includes refractory coating layers deposited by chemical vapour deposition (CVD) or moderate temperature chemical vapour deposition (MT-CVD). The multi-layered wear resistant coating has at least one pair of layers (a) and (b), with layer (b) being deposited immediately on top of layer (a). Layer (a) is a layer of aluminium nitride having hexagonal crystal structure (h-AlN) and a thickness from 10 nm to 750 nm. Layer (b) is a layer of titanium aluminium nitride or titanium aluminium carbonitride represented by the general formula Ti.sub.1-xAl.sub.xC.sub.yN.sub.z with 0.4x0.95, 0y0.10 and 0.85z1.15, having a thickness from 0.5 m to 15 m, and at least 90% of the Ti.sub.1-xAl.sub.xC.sub.yN.sub.z of layer (b) has a face-centered cubic (fcc) crystal structure.

A cutting edge of a machining tool and a surface treatment method for the same. A cutting edge of a machining tool and a region in the vicinity of the cutting edge, e.g. a region of at least 1 mm and preferably at least 5 mm from the cutting edge, are defined as a treatment region; and substantially spherical injection granules having a median diameter of 1 to 20 m are injected onto the treatment region with an injection pressure of 0.01 MPa to 0.7 MPa in order for dimples having an equivalent diameter of 1 to 18 m and preferably 1 to 12 m, and a depth at least equal to 0.02 m and at most equal to 1.0 m to be formed such that the projected surface area of the dimples is at least equal to 30% of the surface area of the treatment region.

A process for producing a hard material layer on a substrate. A multilayer coating system is applied to the substrate by alternate deposition of CrTaN and AlTiN by way of physical vapor deposition (PVD). The CrTaN and/or the AlTiN are preferably deposited from a composite target.

The present invention is directed to a surface-coated cubic boron nitride sintered material tool including a cBN substrate and a hard coating layer formed on a surface of the cBN substrate and having an alternate laminated structure of A layer and B layer. The cBN substrate (sintered material) includes: a Ti compound, WC, AlN, TiB.sub.2, Al.sub.2O.sub.3, and cBN. The A layer has a composition of (Ti.sub.1-xAl.sub.x)N (0.4x0.7 in terms of atomic ratio). The B layer has a composition of (Cr.sub.1-y-zAl.sub.yM.sub.z)N (0.03y0.4 and 0z0.05 in terms of atomic ratio). A plastic deformation work ratio of the B layer is 0.35 to 0.50.

In a drill, a negative land is provided on a rake face, and a ridge line at an intersecting position of the negative land and a flank face, a ridge line at an intersecting position of the flank face and a margin, and a ridge line at an intersecting position of the negative land and the margin are convex faces in a longitudinal rectangular cross section. When a curvature radius of the convex face of a first ridge line at the intersecting position of the flank face and the negative land is 1, at curvature radius of the convex face of a second ridge line at the intersecting position of the flank face and the margin is 0.8 to 1.5 times the curvature radius of the first ridge line, and a curvature radius of the convex face of a fourth ridge line at the intersecting position of the negative land and the margin is 1.5 to 3.0 times the curvature radius of the first ridge line.

A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, the coating layer including at least one predetermined layer, wherein: the predetermined layer is a layer containing a compound having a composition represented by a formula below:

(Al.sub.xTi.sub.yM.sub.1-x-y)N

[wherein M denotes an element of at least one kind selected from the group consisting of Zr, Hf, V, Nb, Ta, Cr, Mo, W and Si, x denotes an atomic ratio of the Al element based on a total of the Al element, the Ti element and a metal element denoted by M, y denotes an atomic ratio of the Ti element based on a total of the Al element, the Ti element and the metal element denoted by M, x satisfies 0.60x0.85, y satisfies 0y0.40, and x+y satisfies 0.60x+y1.00]; an average thickness of the predetermined layer is from 1.4 m or more to 15 m or less; and the predetermined layer has an upper region and a lower region which satisfy conditions (1), (2) and (3) below: condition (1): the upper region has an average thickness of from 0.5 m or more to 2.5 m or less ranging from an interface which is close to a surface of the coated cutting tool toward the substrate, the average thickness being less than an average thickness of the predetermined layer, and the lower region has an average thickness of from 0.5 m or more to 2.5 m or less ranging from an interface which is close to the substrate toward the surface of the coated cutting tool, the average thickness being less than the average thickness of the predetermined layer; (2) an atomic ratio of the Al element contained in the upper region is higher, by from 3 atom % or higher to 10 atom % or lower, than an atomic ratio of the Al element contained in the lower region; and (3) an average particle size in the upper region is greater than an average particle size in the lower region.