Sumitomo Electric Hardmetal Corp. Patente

A chamfering tool rotates about an axis. The chamfering tool comprises a rake face, a front flank face, a rear flank face, a front cutting edge and a rear cutting edge. The front flank face is contiguous to the rake face. The rear flank face is located axially rearward of the front flank face and contiguous to the rake face and the front flank face. The front cutting edge is defined by a ridgeline formed by the rake face and the front flank face. The rear cutting edge is defined by a ridgeline formed by the rake face and the rear flank face. In a radial direction of the chamfering tool, a front end of the front cutting edge is located inward of a rear end of the front cutting edge. In the radial direction of the chamfering tool, a front end of the rear cutting edge is located outward of a rear end of the rear cutting edge. The front cutting edge has a true rake angle larger than 0°. The rear cutting edge has a true rake angle larger than 0°.

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A cemented carbide includes a first phase and a second phase, wherein the first phase consists of a plurality of tungsten carbide grains, a content ratio of the first phase of the cemented carbide is 65 volume% or more and 85 volume% or less, a content ratio of the second phase of the cemented carbide is 4 volume% or more and 25 volume% or less, the second phase includes 50 mass% or more of cobalt, the second phase includes zirconium, a cobalt content ratio M_Co of the cemented carbide is 3 mass% or more and 15 mass% or less, a and b of the cemented carbide indicate a relation of the following formula I: b<0.0485a+0.0001 wherethe a represents a percentage, (M_Zr/M_Co)× 100, of a zirconium content ratio M_Zr of the cemented carbide in mass% with respect to the cobalt content ratio M_Co of the cemented carbide in mass%, the a is more than 0 and 8 or less, the b represents an area percentage of pore in a first region of a cross section of the cemented carbide, and the first region is a region located within a distance of 50 µm from a surface of the cemented carbide in the cross section.

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A cutting tool includes a base material and a coating provided on the base material, the coating includes an α-Al<2>O<3> layer, the α-Al<2>O<3> layer has a thickness of 3 µm or more and 20 µm or less, and, in a measurement field in a rectangular shape that is provided in a cross section of the coating along a normal line to a surface of the coating, and has a dimension of 30 µm in a first direction along the surface of the coating, and a dimension in a second direction orthogonal to the first direction of the coating, including an entire thickness of the α-Al<2>O<3> layer along the second direction, the number of first Σ3 grain boundaries continuous from an imaginary line L1 to an imaginary line L2 and intersecting an imaginary line L3 is 5 or more, where the imaginary line L1 is an imaginary line at a distance of 0.5 µm toward the α-Al<2>O<3> layer, from a first interface of the α-Al<2>O<3> layer, the first interface being an interface located toward the base material, the imaginary line L2 is an imaginary line at a distance of 0.5 µm toward the α-Al<2>O<3> layer, from a second interface of the α-Al<2>O<3> layer, the second interface being an interface located toward the surface of the coating, and the imaginary line L3 is an imaginary line located equidistantly from the imaginary line L 1 and the imaginary line L2.

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A skiving cutter is rotatable around an axis. The skiving cutter is provided with a plurality of cutting edges arranged side by side in a form of an annular shape around the axis. The skiving cutter has a base body portion and an edge tip portion. The edge tip portion is contiguous to the base body portion. The edge tip portion is provided to be arranged side by side with the base body portion in a first direction toward a front side of the skiving cutter along the axis. The edge tip portion forms a plurality of cutting edges. The base body portion is composed of a cemented carbide. The edge tip portion is composed of any one of a cubic boron nitride sintered material, a diamond, or a special cemented carbide.

A skiving cutter is rotatable around an axis. The skiving cutter is provided with a plurality of cutting edges arranged side by side in a form of an annular shape around the axis. The skiving cutter has a base body portion and an edge tip portion. The edge tip portion is contiguous to the base body portion. The edge tip portion is provided to be arranged side by side with the base body portion in a first direction toward a front side of the skiving cutter along the axis. The base body portion is composed of one of a cemented carbide or a high-speed steel. The edge tip portion has an edge tip layer and a cemented carbide layer. The edge tip layer forms a plurality of cutting edges. The cemented carbide layer is provided between the edge tip layer and the base body portion. The edge tip layer is composed of any one of a cubic boron nitride sintered material, a diamond, or a special cemented carbide.

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A cutting tool comprising a rake face and a flank face, the cutting tool being composed of a substrate and a coating provided on the substrate, the coating including a MAIN layer, the MAIN layer including crystal grains of M<x>Al<1-x>N in the cubic crystal system, in the M<x>Al<1-x>N, a metal element M having an atomic ratio x of 0.2 or more and 0.8 or less, in the MAIN layer, M representing a metal element including titanium, chromium, or both, n<R> being 3 or less, where n<R> represents a number of voids at the rake face in the MAIN layer per 50 µm in length in a cross section of the MAIN layer obtained when the MAIN layer is cut along a plane including a normal to the rake face, the void having an area in cross section of 1.0 × 10<-4> µm<2> or more and 0.5 µm<2> or less.

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