Sumitomo Electric Hardmetal Corp.

Sumitomo Electric Industries, Limited

Mayuka Segawa

Takashi Harada

Satoru Kukino

Naoki Watanobe

Taisuke Higashi

Akihiko Ueda

Yoshinori Tanigawa

Machiko Abe

Gaku Harada

Takuya Nohara

Soichiro Kakinoki

Hirotsugu Iwasaki

Hideki Tomimoto

Cutting tool

A drill includes a blade tip part that is formed of diamond and a trunk part that is formed of diamond and is continuous with the blade tip part, the drill rotating about a drill axis, the blade tip part includes N cutting edges where N is an integer of no less than 4, and a proportion of Sto Sis no less than 30% and no more than 60%, where Sis an area of the drill in a cross-section with the drill axis as a normal line, the cross-section including a boundary between the blade tip part and the trunk part, r is a maximum value of a distance from the drill axis to an outer edge of the drill in the cross-section and Sis an area of a circle with r as a radius.

Drill

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 cutting tool includes: a base metal provided with a seat portion; a blade edge member that is a polycrystalline diamond sintered material containing polycrystalline diamond and a binder; and a brazing material that fixes the blade edge member to the seat portion of the base metal. The blade edge member has a thickness of greater than or equal to 0.3 mm. The brazing material is disposed between a blade edge bottom face of the blade edge member and a seat bottom face of the seat portion and is in contact with the blade edge bottom face and the seat bottom face. The flank face is located outside of the base metal with respect to the lateral face of the base metal.

Cutting tool and method for manufacturing same

Growing community of inventors

Itami, Japan

Mayuka Segawa