A coated cutting tool includes a coating layer formed on a substrate. The coating layer includes an alternating laminate structure of two or more compound layers of each of two or more different compositions. One layer contains a compound having a composition (Al.sub.xM.sub.1-x)N, where atomic ratio x is 0.58 to 0.90; and another layer contains a compound having a composition (Al.sub.yM.sub.1-y)N, where atomic ratio y is 0.57 to 0.79. M is an element of at least one kind selected from Groups 4, 5, and 6 elements and Si. An absolute value of a difference between amounts of a specific metal element in the compound layers relative to amounts of the metal element respectively contained therein is between 0 and 5 atom %. An average thickness of each compound layer is from 1 to 50 nm. An average thickness of the alternating laminate structure is from 1.5 to 15 m.

Provided is a coated cutting tool in which a surface of a substrate is coated with a hard coating film. The hard coating film includes: a layer (A) disposed on the surface of the substrate, and having a face-centered cubic lattice structure, in which the total content ratio of W and Ti is at least 85 atomic %, and which contains W as the most abundant element and Ti as the next most abundant element among metal (including metalloid) elements; and a layer (B) disposed on the layer (A) and having a face-centered cubic lattice structure, which is composed of nitrides or carbonitrides containing Al, Cr, and Si, and in which, among metal (including metalloid) elements, the Al content ratio is at least 50 atomic %, the total content ratio of Al and Cr is at least 85 atomic %, and the Si content ratio is 4 to 15 atomic %.

A cutting tool, including: a base; and a coating disposed on the base, wherein the coating includes a first layer, the first layer is composed of an alternate layer in which a first unit layer and a second unit layer are alternately stacked, the first unit layer has a hexagonal crystal structure, the first unit layer is composed of W(C.sub.1-aN.sub.a).sub.x, a represents 0.3 or more and 0.8 or less, x represents 0.8 or more and 1.2 or less, the second unit layer is composed of Al.sub.cCr.sub.1-cN, and c represents 0.40 or more and 0.80 or less.

In one aspect, a coated cutting tool described herein comprises a substrate and a coating adhered to the substrate, the coating including a refractory layer comprising AlON, the AlON layer exhibiting a peak in a range of 33-35 2 in an XRD, wherein the peak has a FWHM of 0.1-0.7 2. In some embodiments, the AlON layer can exhibit a ribbon-like crystallites, needle-like crystallites, or rice-like crystallites and associated surface texture.

A cutting tool, including: a base; and a coating disposed on the base, wherein the coating includes a first layer, the first layer is composed of an alternate layer in which a first unit layer and a second unit layer are alternately stacked, the first unit layer has a hexagonal crystal structure, the first unit layer is composed of W(C.sub.1-aN.sub.a).sub.x, a represents 0.3 or more and 0.8 or less, x represents 0.8 or more and 1.2 or less, the second unit layer is composed of Al.sub.cCr.sub.1-cN, and c represents 0.40 or more and 0.80 or less.

A coated tool part of a machining tool, having a substrate coated with a wear layer and with a bonding layer disposed between the substrate and the wear layer. The wear layer and the bonding layer each have a plurality of sub-layers arranged one on top of another. Each sub-layer includes a first individual ply, a second individual ply, and a third individual ply, wherein the three individual plies in the plurality of sub-layers are arranged one on top of another in a regularly alternating sequence. The first individual ply includes Al.sub.x1Me.sub.1-x1(N.sub.y1C.sub.1-y1). The second individual ply includes Al.sub.x2Me.sub.1-x2(N.sub.y2C.sub.1-y2). The third individual ply includes Al.sub.x3Me.sub.1-x3-z3Si.sub.z3(N.sub.y3C.sub.1-y3). A ply thickness of the third individual plies included in the bonding layer varies from sub-layer to sub-layer such that the ply thickness of the third individual ply in a sub-layer disposed further down, closer to the substrate.

A coated cutting tool includes a body and a hard and wear resistant PVD coating on the body, wherein the body is made from a cemented carbide, cermet, ceramics, polycrystalline diamond or polycrystalline cubic boron nitride based materials. Th coating includes a first (Ti,Al)-based nitride sub-coating and a second (Ti,Al)-based nitride sub-coating. The first (Ti,Al)-based nitride sub-coating can be a single layer, and the second (Ti,Al)-based nitride sub-coating can be a laminated structure, wherein the first (Ti,Al)-based nitride sub-coating includes a (Ti.sub.1-xAl.sub.x)N.sub.z-layer where 0.1<x<0.4, 0.6<z<1.2, and wherein the second (Ti,Al)-based nitride sub-coating includes a (Ti.sub.1-x1-y1Al.sub.x1Cr.sub.y1)N.sub.z1 layer where 0.5<x1<0.75, 0.05<y1<0.2, 0.6<z1<1.2.

One aspect of the disclosure relates to a cutting tool for forming a final opening in a stack that includes at least two layers and a pilot opening having a pilot-opening dimension and extending through at least one of the at least two layers. The cutting tool includes a shank. The cutting tool also includes a first portion including at least one of a first coating or the first coating and a second coating, wherein the first coating at least partially covers the first portion. The cutting tool also includes a second portion between the shank and the first portion, wherein the second portion includes the second coating, and wherein the second coating at least partially covers the second portion.

Provided is a coated cutting tool, which includes a hard coating film containing a layer (b) formed of a nitride or a carbonitride, a layer (c) which is a layered coating film formed by alternately layering a nitride or carbonitride layer (c1) that contains 55 atom % or more and 75 atom % or less of Al, Cr having a second highest content percentage, and at least Si and a nitride or carbonitride layer (c2) that contains 55 atom % or more and 75 atom % or less of Al and Ti having a second highest content, and a layer (d) that is a nitride or carbonitride that contains, with respect to a total amount of metal elements (including metalloid elements), 55 atom % or more and 75 atom % or less of Al and Ti having a second highest content percentage, the content percentage of Ti being 20 atom % or more.

A tool for machining in which defective adhesion of a coating film at an interface of a layer containing titanium and an alumina layer is prevented. A method for producing a tool for machining is provided in which a coating film of a plurality of layers is formed on a surface of a base material by physical vapor deposition (PVD), the method including: a first layer formation step of forming a first layer containing a nitride or carbide of titanium on the surface of the base material; a first barrier layer formation step of forming a barrier layer that covers a surface of the first layer; and a second layer formation step of forming a second layer containing aluminum oxide on a surface of the barrier layer.