Sumitomo Electric Hardmetal Corp.

Sumitomo Electric Industries, Limited

Kenta Sano

Satoru Kukino

Katsumi Okamura

Michiko Matsukawa

Nozomi Tsukihara

Makoto Setoyama

Akito Ishii

Hironari Moroguchi

Machiko Abe

Yusuke Matsuda

A cutting tool includes a substrate; and a coating film, wherein the coating film includes a multilayer structure layer having first unit layer(s) and second unit layer(s), the first unit layer(s) and the second unit layer(s) are alternately layered, under a condition X-ray diffraction intensities of different planes in the multilayer structure layer are respectively represented by I, I, and I, the following formula 0.6≤I/{I+I+I}, the first unit layer(s) has a NaCl-like structure in which an interplanar spacing din a c-axis direction is larger than an interplanar spacing din an a-axis direction, the second unit layer(s) has a NaCl-like structure in which an interplanar spacing din the c-axis direction is smaller than an interplanar spacing din the a-axis direction, and the following formulas are satisfied as well 1≤d/d≤1.02, 1.01≤d/d≤1.05, and d/d<d/d.

Cutting tool

A cubic boron nitride sintered material comprises 30% by volume or more and 80% by volume or less of cubic boron nitride grains and 20% by volume or more and 70% by volume or less of a binder phase, the cubic boron nitride grains having a dislocation density of 3&#xd7;10/mor more and 1&#xd7;10/mor less.

Cubic boron nitride sintered material

A surface-coated boron nitride sintered body tool is provided, in which a cutting edge portion includes a compound sintered body and a coating layer. The compound sintered body includes cBN particles. The compound sintered body includes 45-80 vol % of cBN particles. A first particle size distribution curve of the cBN particles has one or more peaks in a range in which a particle size is 0.1-0.7 &#x3bc;m. A second particle size distribution curve of the cBN particles has a first peak having a maximum peak height in a range in which the particle size is 2.0-7.0 &#x3bc;m. An integral value ratio (I/I&#xd7;100) is 1-20, in the second particle size distribution curve, the integral value Ibeing in the range in which the particle size is 0.1-0.7 &#x3bc;m, and the integral value Ibeing in an entire range.

Surface-coated boron nitride sintered body tool

Growing community of inventors

Itami, Japan

Kenta Sano