Tungaloy

Provided is a coated cutting tool which has excellent wear resistance and fracture resistance and which accordingly allows for an extended tool life. A coated cutting tool including a substrate and a coating layer formed on a surface of the substrate, wherein: the coating layer includes a lower layer including a specific compound layer, an intermediate layer including an α-Al₂O₃ layer, and an upper layer in this order from the substrate side to the surface side of the coating layer; the upper layer includes one or more Ti compound layers containing a specific compound; the upper layer includes at least one TiCN layer containing TiCN; the lower layer, the intermediate layer and the upper layer have a specific average thickness; in a cross section of the TiCN layer of the upper layer parallel to the surface of the substrate, when a sum of areas of an entire cross section is taken as 100 area%, a ratio of a sum of cross-sectional areas of specific regions A is 30 area% or more and 70 area% or less; and in the region A, a ratio of the total length of Σ3 grain boundaries to 100% of the total grain boundary length, is 30% or more and less than 60%.

In order to easily disposed a projection by accurately inspecting and measuring (correcting) a position of the projection relative to the cutting edge, and to improve the chip control regardless the insert shape by optimizing the disposition of the projection, the present invention provides a cutting tool including: an upper surface; a lower surface; a side surface; a cutting edge including a pair of major cutting edges and a corner cutting edge; a first upper surface; a second upper surface; an inclined surface; a groove disposed in the second upper surface; and a first projection and a second projection which are formed to be projected from the inclined surface. The first projection extends on the groove along the extended line, and the second projection is disposed to be linearly symmetric with respect to the extended line. At an intersection between the corner cutting edge and the bisector in a top view, L1 < L2 is established, where L1 is a distance from a virtual line intersecting perpendicularly to the bisector to a leading end of the first projection, and L2 is a distance from the virtual line to a leading end of the second projection.

Body 10 of a cutting tool 1 that machines a workpiece with a leading end cutting edge 81 arranged on a leading end side and a peripheral cutting edge 82 arranged on an outer periphery side, the body comprising: a first coolant flow path 60 that is provided inside the body so as to extend from a base end toward a leading end; and a groove-like second coolant flow path 90 that is provided on an outer periphery of the body so as to extend along a central axis 10A.

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Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …

Zusammenfassung wird geladen …