Abstract: A cutting tool comprises a substrate and a coating provided on the substrate, the coating including: a first alumina layer, a titanium compound layer, and a second alumina layer; in which a portion adjacent to the titanium compound layer in the first alumina layer serves as an interface region, a portion that is not the interface region in the first alumina layer serves as a non-interface region, a content of nitrogen in the interface region is 0.2 at % to 12 at %, and a content of nitrogen in the non-interface region is 0 at % to 0.15 at %; and the titanium compound layer includes a multilayer structure layer adjacent to the first alumina layer, the multilayer structure layer is composed of a first unit layer and a second unit layer, the first unit layer is made of titanium carbonitride, and the second unit layer is made of titanium carbonitroxide.

Abstract: A cemented carbide including a first phase being composed of a plurality of tungsten carbide grains and a second phase containing cobalt, wherein the cemented carbide contains chromium and vanadium, a mass-based percentage of the chromium to the cobalt is 5% or more and 9% or less, a mass-based percentage of the vanadium to the cobalt is 2% or more and 5% or less, an area ratio of the second phase is 7.5 area % or more and 13.5 area % or less, and a number of the second phases is 1000 or more, wherein the area ratio of the second phase and the number of the second phases are measured in a measurement field of 101 ?m2 by performing image processing on a scanning electron microscope image of a cross section of the cemented carbide.

Abstract: A cutting tool comprises a substrate and a coating provided on the substrate, the coating including a first alumina layer provided on the substrate, a titanium compound layer provided directly on the first alumina layer, and a second alumina layer provided directly on the titanium compound layer, in which a portion adjacent to the titanium compound layer in the first alumina layer serves as an interface region, a portion that is not the interface region in the first alumina layer serves as a non-interface region, a content of nitrogen in the interface region is 0.2 at % or more and 11 at % or less, and a content of nitrogen in the non-interface region is 0 at % or more and 0.15 at % or less; and the titanium compound layer comprises a layer of titanium carbonitroxide adjacent to the first alumina layer.

Abstract: A cutting tool includes a substrate and a coating provided on the substrate, the coating including: a first alumina layer provided on the substrate, a titanium compound layer provided directly on the first alumina layer, and a second alumina layer provided directly on the titanium compound layer; in which a portion adjacent to the titanium compound layer in the first alumina layer serves as an interface region, a portion that is not the interface region in the first alumina layer serves as a non-interface region, a content of nitrogen in the interface region is 0.2 at % or more and 10.5 at % or less, and a content of nitrogen in the non-interface region is 0 at % or more and 0.15 at % or less; and the titanium compound layer comprises a layer of titanium carbonitride adjacent to the first alumina layer.

Abstract: A cutting tool is rotatable about a central axis and has a front end in an axial direction along the central axis. The cutting tool includes a body, a blade, a first attachment screw, an adjustment piece, and a second attachment screw. The body has an outer peripheral surface. A pocket is formed in the outer peripheral surface at an end portion on the front end side. The blade is attached to the body by screwing the first attachment screw into the body in the pocket. The blade has a blade side surface facing inward in a radial direction that is orthogonal to the axial direction and that passes through the central axis. An inner wall surface of the pocket has a contact surface facing the blade side surface with a space being interposed between the blade side surface and the contact surface in the radial direction.

Abstract: A cutting tool comprising a base material and a coating disposed on the base material, wherein the coating comprises a first layer, the first layer consists of a MoC1-x layer formed from a compound represented by MoC1-x or a TaC1-y layer formed from a compound represented by TaC1-y, the compound represented by MoC1-x consists of a hexagonal crystal structure, the x is 0.40 or more and 0.60 or less, the compound represented by TaC1-y comprises 95% by mass or more of a hexagonal crystal structure, and the y is 0:40 or more and 0.60 or less.

Abstract: A polycrystalline diamond comprising diamond particles, wherein: the content of the diamond particles is more than 99% by volume based on the total volume of the polycrystalline diamond; the median diameter d50 of the diamond particles is 10 nm or more and 200 nm or less; and the dislocation density of the diamond particles is 2.0×1015 m?2 or more and 4.0×1016 m?2 or less.

Abstract: Provided is a cutting tool comprising a base material and a film arranged on the base material, in which the film includes a hard carbon film on the outermost surface thereof, the hard carbon film includes a first region, the first region is a region sandwiched between the surface of the hard carbon film and an imaginary plane P at a distance of 40 nm from the surface to the base material side, and the sp2 component amount C2 and the sp3 component amount C3 in the first region exhibit a relationship of the following formula 1: {C2/(C2+C3)}×100?2.0??formula 1.

Abstract: A cutting tool comprising a base material and a coating; wherein: the coating comprises a titanium compound layer and an a-Al2O3 layer; the a-Al2O3 layer comprises a region A1 and a region A2; the titanium compound layer comprises a region B1 and a region B2; an average particle diameter a1 of the a-Al2O3 particles in the region A1, an average particle diameter a2 of the a-Al2O3 particles in the region A2, an average particle diameter b1 of the titanium compound particles in the region B1, and an average particle diameter b2 of the titanium compound particles in the region B2 satisfy relationships represented by respective expressions 1 to 3: 0.80?a2/b2?1.27??Expression 1 1.50?a1/a2?10??Expression 2 1.45?b1/b2?5??Expression 3 : and the average particle diameter b1 is 0.10 ?m or more and 0.50 ?m or less.

Abstract: A boring tool has a cutting insert, a holder, and a pressing member. The cutting insert includes a base member and a cutting member. The base member includes a first side surface, a second side surface, a third side surface, and a fourth side surface. The holder includes a front end surface, a rear end surface, and an outer peripheral surface. The holder is provided with a first hole and a second hole. The first hole is opened in the front end surface. The second hole is opened in the outer peripheral surface. The holder includes a stopper. A surface defining the second hole includes a first inner side surface and a second inner side surface. The pressing member is in contact with the fourth side surface in a state in which the pressing member is disposed in the first hole.

Abstract: A cutting tool comprises a substrate and a coating that coats the substrate, the coating including an ?-alumina layer provided on the substrate, the ?-alumina layer including crystal grains of ?-alumina, the ?-alumina layer including a lower portion and an upper portion, the upper portion being occupied in area at a ratio of 50% or more by crystal grains of ?-alumina having a (006) plane with a normal thereto having a direction within ±15° with respect to a direction of the normal to the second interface, the lower portion being occupied in area at a ratio of 50% or more by crystal grains of ?-alumina having a (110) plane with a normal thereto having a direction within ±15° with respect to the direction of the normal to the second interface, the ?-alumina layer having a thickness of 3 ?m or more and 20 ?m or less.

Abstract: Provided is a cutting tool that can have a long tool life even when used to cut soft metals in particular. The cutting tool comprises a base body and a hard carbon film arranged on the base body, the hard carbon film includes an amorphous phase and a graphite phase, the density of the hard carbon film is no less than 2.5 g/cm3 and no more than 3.5 g/cm3, the degree of crystallinity of the hard carbon film is no more than 6.5%, and the average coordination number of the amorphous phase is no less than 2.5 and no more than 4.