A coated cutting tool is provided which allows for satisfactory machining over a long period of time, particularly in the machining of difficult-to-machine materials with low thermal conductivity. The coated cutting tool includes a substrate and a coating layer formed on a surface of the substrate, wherein: at least one layer of the coating layer comprises a predetermined layer containing a compound having a composition represented by the formula: (Al.sub.XTi.sub.1-X)N [wherein x denotes an atomic ratio of the Al element based on a total of the Al element and the Ti element, and x satisfies 0.60x0.85]; a value of an orientation index TC (311) of a cubic (311) plane of the predetermined layer is from 2.5 or more to 4.2 or less; and an average thickness of the predetermined layer is from 1.0 m or more to 12.0 m or less.

A surface-coated cutting tool of the present invention includes: a hard coating layer which is vapor-deposited on a surface of a tool body made of tungsten carbide-based cemented carbide and has an average thickness of 2 mm to 10 mm, in which (a) the hard coating layer comprises a layer made of complex nitride of Al, Cr, and B in which a ratio (atomic ratio) of the amount of Cr is 0.2 to 0.45 and a ratio (atomic ratio) of the amount of B is 0.01 to 0.1 to the total amount of Al, Cr, and B, and (b) in an area within 100 mm from an edge tip on a flank face of the surface-coated cutting tool, the hard coating layer has a granular crystal grain structure and the average grain size of granular crystal grains is 0.1 mm to 0.4 mm on the surface of the hard coating layer.

A solid carbide milling cutter has a substrate of hard metal and a multi-layer coating deposited at least to surface regions that contact a workpiece during a milling operation. The multi-layer coating includes a single-layer or a multi-layer functional layer deposited directly on the substrate surface and a single-layer or a multi-layer covering layer deposited on the functional layer. The functional layer has one or more layers of Ti.sub.xAl.sub.1-xN with 0.3x0.55. The covering layer has one or more layers of ZrN. The functional layer and the covering layer are deposited by HIPIMS, wherein during the deposition of the functional layer power pulses are applied to each sputtering target consisting of material to be deposited, which power pulses transfer an amount of energy to each sputtering target that exceeds a maximum power density in the pulse of 500 W/cm.sup.2.

It is an object to provide a rotating tool having an excellent wear resistance. The rotating tool includes: a base member including a cutting edge portion and a flute portion; and a coating film that coats a surface of the base member, a ratio B/A of a film thickness B of the coating film coating a surface of the flute portion to a film thickness A of the coating film coating a surface of the cutting edge portion being not less than 0.8.

The present invention provides a more practical hard-coated cutting tool having improved cutting performance during finishing so as to obtain a better finished surface. Provided is a hard-coated cutting tool including a tool body (7) coated with a hard coating (4) and having a cutting edge (3) formed on a ridge line intersecting a flank face (1) and a rake face (2). In the hard-coated cutting tool, the thickness h1 of the hard coating (4) on the flank face (1) side and the thickness h2 of the hard coating (4) on the rake face (2) side near the cutting edge (3) satisfies conditions 8 mh130 m and 0h2/h10.5 in a cross-section perpendicular to the cutting edge (3) in a range equal to or less than 0.3 times the tool diameter in the axial direction from the tip of the tool.

A surface-coated cutting tool includes a base material and a coating formed on the base material. The coating includes an -Al.sub.2O.sub.3 layer. The -Al.sub.2O.sub.3 layer contains -Al.sub.2O.sub.3 crystal grains and sulfur, and has a TC(006) of more than 5 in texture coefficient TC(hkl). The sulfur has a concentration distribution in which a concentration of the sulfur decreases in a direction away from a base-material-side surface of the -Al.sub.2O.sub.3 layer, in a thickness direction of the -Al.sub.2O.sub.3 layer.

Even if chips enter a gap between a flank face and a surface to be worked, the defect of the flank face or a cutting edge is suppressed by the control of the flow of the chips. A plurality of cutting edges, which are undulated in wave forms in a direction of an axis, are formed on an outer periphery of a front end portion of an end mill body rotating about the axis so that phases of the wave forms are displaced from each other in a path of rotation about the axis; flank faces of the cutting edges are covered with a coating film; and rough surface regions and smooth surface regions are alternately formed on the surface of at least portions of the coating film, which are close to the cutting edges, in the direction of the axis.

The hard coating layer includes at least a complex nitride or complex carbonitride layer expressed by the composition formula (Ti.sub.1-xAl.sub.x)(C.sub.yN.sub.1-y). The average Al content ratio x.sub.avg the average C content ratio y.sub.avg satisfy 0.60x.sub.avg0.95 and 0y.sub.avg0.005, respectively, each of the x.sub.avg and y.sub.avg is in atomic ratio. The crystal grains constituting the complex nitride or complex carbonitride layer include a crystal grain having the NaCl face-centered cubic structure. A predetermined average crystal grain misorientation exists in the crystal grains having the NaCl face-centered cubic structure.

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.

A surface-coated cutting tool of the present invention includes: a cutting tool body; and a hard coating layer provided on a surface of the cutting tool body, in which the hard coating layer includes a complex nitride or carbonitride layer, which is expressed by a composition formula: (Ti.sub.1-xAl.sub.x)(C.sub.yN.sub.1-y), the average content ratio X.sub.avg of Al and the average content ratio Y.sub.avg of C in the complex nitride or carbonitride layer satisfy 0.60X.sub.avg0.95 and 0Y.sub.avg0.005, provided that each of X.sub.avg and Y.sub.avg is in atomic ratio, the complex nitride or carbonitride layer includes crystal grains with a cubic structure, and in the crystal grains with the cubic structure, a composition of Ti and Al is periodically changed in a direction of the normal line to the surface of the cutting tool body.