Sumitomo Electric Hardmetal Corp.

Sumitomo Electric Industries, Limited

Taisuke Higashi

Satoru Kukino

Takashi Harada

Naoki Watanobe

Masashi Harada

Rintaro Sugimoto

Katsumi Okamura

Daisuke Murakami

Takashi Kanda

Machiko Abe

Michiko Matsukawa

Yusuke Matsuda

Mayuka Segawa

Akito Ishii

Tadashi Yamaguchi

Shinichiro Yurugi

Mari Sogabe

Cutting tool

A cutting tool rotates about a rotation axis, and includes a tip end portion. The tip end portion includes a partially spherical surface that is brought into contact with a workpiece. The surface is provided with a plurality of recesses disposed apart from each other. An opening edge of each of the plurality of recesses constitutes a cutting edge.

A composite sintered material includes: a plurality of diamond grains having an average grain size of less than or equal to 10 μm; a plurality of cubic boron nitride grains having an average grain size of less than or equal to 2 μm; and a plurality of aluminum oxide grains having an average grain size of less than or equal to 0.5 μm; and a remainder of a binder phase, wherein at least parts of adjacent diamond grains are bound to one another, the binder phase includes cobalt, in the composite sintered material, a content of the diamond grains is from 30 to 92 volume %, a content of the cubic boron nitride grains is from 3 to 40 volume %, a content of the aluminum oxide grains is from 2 to 15 volume %, and a content of the cobalt is from 3 to 30 volume %.

Composite sintered material

A rotary cutting tool according to the present disclosure is rotatable about an axial line and includes a rake face and a flank face. The flank face is contiguous to the rake face. A ridgeline between the rake face and the flank face constitutes a cutting edge. In a cross section perpendicular to the axial line, the rake face is constituted of a plurality of straight line portions.

Rotary cutting tool

Growing community of inventors

Itami, Japan

Taisuke Higashi