Sumitomo Electric Hardmetal Corp.

Chie Suzuki

Anongsack Paseuth

Hideaki Kanaoka

Yoshio Okada

Minoru Itoh

A surface coated cutting tool with a high level of both wear resistance and defect resistance in balance is provided. The surface coated cutting tool of the present invention includes a base material, and a coat film formed on the base material. The coat film includes at least one titanium carbonitride layer. The titanium carbonitride layer has a maximum value for an orientational index TC (220) among texture coefficients TC (hkl). When an indentation hardness of a standard block for hardness is Hs and an indentation hardness of the titanium carbonitride layer is Ht, the average value of the relative hardness Ht/Hs for a plurality of times of measurement is greater than or equal to 3. The difference between the maximum value Ht/Hs and minimum value Ht/Hs of the relative hardness of the titanium carbonitride layer to the relative hardness Ht/Hs is less than or equal to 0.5.

Surface coated cutting tool

Wear resistance and chipping resistance are both highly established for a surface-coated cutting tool. The surface-coated cutting tool of the present invention includes a base material and a coat film formed on the base material. A first coat layer at a chamfer portion has residual stress that exhibits a minimal value at a depth A within 2 &#x3bc;m from the surface, and that is greater than or equal to &#x2212;7 GPa and less than or equal to &#x2212;1 GPa.

Surface-coated cutting tool

A surface-coated cutting tool having excellent abrasion resistance and defect resistance is provided. The surface-coated cutting tool includes a substrate and a covering layer, wherein the covering layer includes one or two or more sublayers, a thickness Tof a portion of the covering layer having the smallest thickness in a cutting edge line portion and a thickness Tof the covering layer at a point 1 mm away from a cutting edge line in a rake face direction in a cross section cut by a particular plane satisfy T&#x3c;T, and a point a on the surface of the covering layer a distance Daway from the cutting edge line in the rake face direction and a point b on the surface of the covering layer a distance Daway from the cutting edge line in a flank face direction satisfy particularly numerical ranges of Dand D, and in 10% or more of a region E of the covering layer having a thickness in the range of 0.1 Tto 0.9 Tfrom the surface and extending from the point a to the point b, the deviation in the crystal orientation of crystal grains constituting the covering layer is 5 degrees or more and less than 10 degrees.

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Itami, Japan

Chie Suzuki